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[lighttpd.git] / src / mod_fastcgi.c

#include "first.h"

#include "buffer.h"
#include "server.h"
#include "keyvalue.h"
#include "log.h"

#include "http_chunk.h"
#include "fdevent.h"
#include "connections.h"
#include "response.h"
#include "joblist.h"

#include "plugin.h"

#include "inet_ntop_cache.h"
#include "stat_cache.h"
#include "status_counter.h"

#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <assert.h>
#include <signal.h>

#ifdef HAVE_FASTCGI_FASTCGI_H
# include <fastcgi/fastcgi.h>
#else
# ifdef HAVE_FASTCGI_H
#  include <fastcgi.h>
# else
#  include "fastcgi.h"
# endif
#endif /* HAVE_FASTCGI_FASTCGI_H */

#include <stdio.h>

#include "sys-socket.h"

#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif

/*
 *
 * TODO:
 *
 * - add timeout for a connect to a non-fastcgi process
 *   (use state_timestamp + state)
 *
 */

typedef struct fcgi_proc {
        size_t id; /* id will be between 1 and max_procs */
        buffer *unixsocket; /* config.socket + "-" + id */
        unsigned port;  /* config.port + pno */

        buffer *connection_name; /* either tcp:<host>:<port> or unix:<socket> for debugging purposes */

        pid_t pid;   /* PID of the spawned process (0 if not spawned locally) */


        size_t load; /* number of requests waiting on this process */

        size_t requests;  /* see max_requests */
        struct fcgi_proc *prev, *next; /* see first */

        time_t disabled_until; /* this proc is disabled until, use something else until then */

        int is_local;

        enum {
                PROC_STATE_UNSET,    /* init-phase */
                PROC_STATE_RUNNING,  /* alive */
                PROC_STATE_OVERLOADED, /* listen-queue is full,
                                          don't send anything to this proc for the next 2 seconds */
                PROC_STATE_DIED_WAIT_FOR_PID, /* */
                PROC_STATE_DIED,     /* marked as dead, should be restarted */
                PROC_STATE_KILLED    /* was killed as we don't have the load anymore */
        } state;
} fcgi_proc;

typedef struct {
        /* the key that is used to reference this value */
        buffer *id;

        /* list of processes handling this extension
         * sorted by lowest load
         *
         * whenever a job is done move it up in the list
         * until it is sorted, move it down as soon as the
         * job is started
         */
        fcgi_proc *first;
        fcgi_proc *unused_procs;

        /*
         * spawn at least min_procs, at max_procs.
         *
         * as soon as the load of the first entry
         * is max_load_per_proc we spawn a new one
         * and add it to the first entry and give it
         * the load
         *
         */

        unsigned short max_procs;
        size_t num_procs;    /* how many procs are started */
        size_t active_procs; /* how many of them are really running, i.e. state = PROC_STATE_RUNNING */

        /*
         * time after a disabled remote connection is tried to be re-enabled
         *
         *
         */

        unsigned short disable_time;

        /*
         * some fastcgi processes get a little bit larger
         * than wanted. max_requests_per_proc kills a
         * process after a number of handled requests.
         *
         */
        size_t max_requests_per_proc;


        /* config */

        /*
         * host:port
         *
         * if host is one of the local IP adresses the
         * whole connection is local
         *
         * if port is not 0, and host is not specified,
         * "localhost" (INADDR_LOOPBACK) is assumed.
         *
         */
        buffer *host;
        unsigned short port;
        sa_family_t family;

        /*
         * Unix Domain Socket
         *
         * instead of TCP/IP we can use Unix Domain Sockets
         * - more secure (you have fileperms to play with)
         * - more control (on locally)
         * - more speed (no extra overhead)
         */
        buffer *unixsocket;

        /* if socket is local we can start the fastcgi
         * process ourself
         *
         * bin-path is the path to the binary
         *
         * check min_procs and max_procs for the number
         * of process to start up
         */
        buffer *bin_path;

        /* bin-path is set bin-environment is taken to
         * create the environement before starting the
         * FastCGI process
         *
         */
        array *bin_env;

        array *bin_env_copy;

        /*
         * docroot-translation between URL->phys and the
         * remote host
         *
         * reasons:
         * - different dir-layout if remote
         * - chroot if local
         *
         */
        buffer *docroot;

        /*
         * fastcgi-mode:
         * - responser
         * - authorizer
         *
         */
        unsigned short mode;

        /*
         * check_local tells you if the phys file is stat()ed
         * or not. FastCGI doesn't care if the service is
         * remote. If the web-server side doesn't contain
         * the fastcgi-files we should not stat() for them
         * and say '404 not found'.
         */
        unsigned short check_local;

        /*
         * append PATH_INFO to SCRIPT_FILENAME
         *
         * php needs this if cgi.fix_pathinfo is provided
         *
         */

        unsigned short break_scriptfilename_for_php;

        /*
         * workaround for program when prefix="/"
         *
         * rule to build PATH_INFO is hardcoded for when check_local is disabled
         * enable this option to use the workaround
         *
         */

        unsigned short fix_root_path_name;

        /*
         * If the backend includes X-Sendfile in the response
         * we use the value as filename and ignore the content.
         *
         */
        unsigned short xsendfile_allow;
        array *xsendfile_docroot;

        ssize_t load; /* replace by host->load */

        size_t max_id; /* corresponds most of the time to
        num_procs.

        only if a process is killed max_id waits for the process itself
        to die and decrements it afterwards */

        buffer *strip_request_uri;

        unsigned short kill_signal; /* we need a setting for this as libfcgi
                                       applications prefer SIGUSR1 while the
                                       rest of the world would use SIGTERM
                                       *sigh* */

        int listen_backlog;
        int refcount;
} fcgi_extension_host;

/*
 * one extension can have multiple hosts assigned
 * one host can spawn additional processes on the same
 *   socket (if we control it)
 *
 * ext -> host -> procs
 *    1:n     1:n
 *
 * if the fastcgi process is remote that whole goes down
 * to
 *
 * ext -> host -> procs
 *    1:n     1:1
 *
 * in case of PHP and FCGI_CHILDREN we have again a procs
 * but we don't control it directly.
 *
 */

typedef struct {
        buffer *key; /* like .php */

        int note_is_sent;
        int last_used_ndx;

        fcgi_extension_host **hosts;

        size_t used;
        size_t size;
} fcgi_extension;

typedef struct {
        fcgi_extension **exts;

        size_t used;
        size_t size;
} fcgi_exts;


typedef struct {
        fcgi_exts *exts;

        array *ext_mapping;

        unsigned int debug;
} plugin_config;

typedef struct {
        char **ptr;

        size_t size;
        size_t used;
} char_array;

/* generic plugin data, shared between all connections */
typedef struct {
        PLUGIN_DATA;

        buffer *fcgi_env;

        buffer *path;

        buffer *statuskey;

        plugin_config **config_storage;

        plugin_config conf; /* this is only used as long as no handler_ctx is setup */
} plugin_data;

/* connection specific data */
typedef enum {
        FCGI_STATE_INIT,
        FCGI_STATE_CONNECT_DELAYED,
        FCGI_STATE_PREPARE_WRITE,
        FCGI_STATE_WRITE,
        FCGI_STATE_READ
} fcgi_connection_state_t;

typedef struct {
        fcgi_proc *proc;
        fcgi_extension_host *host;
        fcgi_extension *ext;

        fcgi_connection_state_t state;
        time_t   state_timestamp;

        chunkqueue *rb; /* read queue */
        chunkqueue *wb; /* write queue */
        off_t     wb_reqlen;

        buffer   *response_header;

        int       fd;        /* fd to the fastcgi process */
        int       fde_ndx;   /* index into the fd-event buffer */

        pid_t     pid;
        int       got_proc;
        int       reconnects; /* number of reconnect attempts */

        int       request_id;
        int       send_content_body;

        plugin_config conf;

        connection *remote_conn;  /* dumb pointer */
        plugin_data *plugin_data; /* dumb pointer */
} handler_ctx;


/* ok, we need a prototype */
static handler_t fcgi_handle_fdevent(server *srv, void *ctx, int revents);

static void reset_signals(void) {
#ifdef SIGTTOU
        signal(SIGTTOU, SIG_DFL);
#endif
#ifdef SIGTTIN
        signal(SIGTTIN, SIG_DFL);
#endif
#ifdef SIGTSTP
        signal(SIGTSTP, SIG_DFL);
#endif
        signal(SIGHUP, SIG_DFL);
        signal(SIGPIPE, SIG_DFL);
        signal(SIGUSR1, SIG_DFL);
}

static void fastcgi_status_copy_procname(buffer *b, fcgi_extension_host *host, fcgi_proc *proc) {
        buffer_copy_string_len(b, CONST_STR_LEN("fastcgi.backend."));
        buffer_append_string_buffer(b, host->id);
        if (proc) {
                buffer_append_string_len(b, CONST_STR_LEN("."));
                buffer_append_int(b, proc->id);
        }
}

static void fcgi_proc_load_inc(server *srv, handler_ctx *hctx) {
        plugin_data *p = hctx->plugin_data;
        hctx->proc->load++;

        status_counter_inc(srv, CONST_STR_LEN("fastcgi.active-requests"));

        fastcgi_status_copy_procname(p->statuskey, hctx->host, hctx->proc);
        buffer_append_string_len(p->statuskey, CONST_STR_LEN(".load"));

        status_counter_set(srv, CONST_BUF_LEN(p->statuskey), hctx->proc->load);
}

static void fcgi_proc_load_dec(server *srv, handler_ctx *hctx) {
        plugin_data *p = hctx->plugin_data;
        hctx->proc->load--;

        status_counter_dec(srv, CONST_STR_LEN("fastcgi.active-requests"));

        fastcgi_status_copy_procname(p->statuskey, hctx->host, hctx->proc);
        buffer_append_string_len(p->statuskey, CONST_STR_LEN(".load"));

        status_counter_set(srv, CONST_BUF_LEN(p->statuskey), hctx->proc->load);
}

static void fcgi_host_assign(server *srv, handler_ctx *hctx, fcgi_extension_host *host) {
        plugin_data *p = hctx->plugin_data;
        hctx->host = host;
        hctx->host->load++;

        fastcgi_status_copy_procname(p->statuskey, hctx->host, NULL);
        buffer_append_string_len(p->statuskey, CONST_STR_LEN(".load"));

        status_counter_set(srv, CONST_BUF_LEN(p->statuskey), hctx->host->load);
}

static void fcgi_host_reset(server *srv, handler_ctx *hctx) {
        plugin_data *p = hctx->plugin_data;
        hctx->host->load--;

        fastcgi_status_copy_procname(p->statuskey, hctx->host, NULL);
        buffer_append_string_len(p->statuskey, CONST_STR_LEN(".load"));

        status_counter_set(srv, CONST_BUF_LEN(p->statuskey), hctx->host->load);

        hctx->host = NULL;
}

static void fcgi_host_disable(server *srv, handler_ctx *hctx) {
        plugin_data *p    = hctx->plugin_data;

        if (hctx->host->disable_time || hctx->proc->is_local) {
                if (hctx->proc->state == PROC_STATE_RUNNING) hctx->host->active_procs--;
                hctx->proc->disabled_until = srv->cur_ts + hctx->host->disable_time;
                hctx->proc->state = hctx->proc->is_local ? PROC_STATE_DIED_WAIT_FOR_PID : PROC_STATE_DIED;

                if (p->conf.debug) {
                        log_error_write(srv, __FILE__, __LINE__, "sds",
                                "backend disabled for", hctx->host->disable_time, "seconds");
                }
        }
}

static int fastcgi_status_init(server *srv, buffer *b, fcgi_extension_host *host, fcgi_proc *proc) {
#define CLEAN(x) \
        fastcgi_status_copy_procname(b, host, proc); \
        buffer_append_string_len(b, CONST_STR_LEN(x)); \
        status_counter_set(srv, CONST_BUF_LEN(b), 0);

        CLEAN(".disabled");
        CLEAN(".died");
        CLEAN(".overloaded");
        CLEAN(".connected");
        CLEAN(".load");

#undef CLEAN

#define CLEAN(x) \
        fastcgi_status_copy_procname(b, host, NULL); \
        buffer_append_string_len(b, CONST_STR_LEN(x)); \
        status_counter_set(srv, CONST_BUF_LEN(b), 0);

        CLEAN(".load");

#undef CLEAN

        return 0;
}

static handler_ctx * handler_ctx_init(void) {
        handler_ctx * hctx;

        hctx = calloc(1, sizeof(*hctx));
        force_assert(hctx);

        hctx->fde_ndx = -1;

        hctx->response_header = buffer_init();

        hctx->request_id = 0;
        hctx->state = FCGI_STATE_INIT;
        hctx->proc = NULL;

        hctx->fd = -1;

        hctx->reconnects = 0;
        hctx->send_content_body = 1;

        hctx->rb = chunkqueue_init();
        hctx->wb = chunkqueue_init();
        hctx->wb_reqlen = 0;

        return hctx;
}

static void handler_ctx_free(server *srv, handler_ctx *hctx) {
        if (hctx->host) {
                fcgi_host_reset(srv, hctx);
        }

        buffer_free(hctx->response_header);

        chunkqueue_free(hctx->rb);
        chunkqueue_free(hctx->wb);

        free(hctx);
}

static fcgi_proc *fastcgi_process_init(void) {
        fcgi_proc *f;

        f = calloc(1, sizeof(*f));
        f->unixsocket = buffer_init();
        f->connection_name = buffer_init();

        f->prev = NULL;
        f->next = NULL;

        return f;
}

static void fastcgi_process_free(fcgi_proc *f) {
        if (!f) return;

        fastcgi_process_free(f->next);

        buffer_free(f->unixsocket);
        buffer_free(f->connection_name);

        free(f);
}

static fcgi_extension_host *fastcgi_host_init(void) {
        fcgi_extension_host *f;

        f = calloc(1, sizeof(*f));

        f->id = buffer_init();
        f->host = buffer_init();
        f->unixsocket = buffer_init();
        f->docroot = buffer_init();
        f->bin_path = buffer_init();
        f->bin_env = array_init();
        f->bin_env_copy = array_init();
        f->strip_request_uri = buffer_init();
        f->xsendfile_docroot = array_init();

        return f;
}

static void fastcgi_host_free(fcgi_extension_host *h) {
        if (!h) return;
        if (h->refcount) {
                --h->refcount;
                return;
        }

        buffer_free(h->id);
        buffer_free(h->host);
        buffer_free(h->unixsocket);
        buffer_free(h->docroot);
        buffer_free(h->bin_path);
        buffer_free(h->strip_request_uri);
        array_free(h->bin_env);
        array_free(h->bin_env_copy);
        array_free(h->xsendfile_docroot);

        fastcgi_process_free(h->first);
        fastcgi_process_free(h->unused_procs);

        free(h);

}

static fcgi_exts *fastcgi_extensions_init(void) {
        fcgi_exts *f;

        f = calloc(1, sizeof(*f));

        return f;
}

static void fastcgi_extensions_free(fcgi_exts *f) {
        size_t i;

        if (!f) return;

        for (i = 0; i < f->used; i++) {
                fcgi_extension *fe;
                size_t j;

                fe = f->exts[i];

                for (j = 0; j < fe->used; j++) {
                        fcgi_extension_host *h;

                        h = fe->hosts[j];

                        fastcgi_host_free(h);
                }

                buffer_free(fe->key);
                free(fe->hosts);

                free(fe);
        }

        free(f->exts);

        free(f);
}

static int fastcgi_extension_insert(fcgi_exts *ext, buffer *key, fcgi_extension_host *fh) {
        fcgi_extension *fe;
        size_t i;

        /* there is something */

        for (i = 0; i < ext->used; i++) {
                if (buffer_is_equal(key, ext->exts[i]->key)) {
                        break;
                }
        }

        if (i == ext->used) {
                /* filextension is new */
                fe = calloc(1, sizeof(*fe));
                force_assert(fe);
                fe->key = buffer_init();
                fe->last_used_ndx = -1;
                buffer_copy_buffer(fe->key, key);

                /* */

                if (ext->size == 0) {
                        ext->size = 8;
                        ext->exts = malloc(ext->size * sizeof(*(ext->exts)));
                        force_assert(ext->exts);
                } else if (ext->used == ext->size) {
                        ext->size += 8;
                        ext->exts = realloc(ext->exts, ext->size * sizeof(*(ext->exts)));
                        force_assert(ext->exts);
                }
                ext->exts[ext->used++] = fe;
        } else {
                fe = ext->exts[i];
        }

        if (fe->size == 0) {
                fe->size = 4;
                fe->hosts = malloc(fe->size * sizeof(*(fe->hosts)));
                force_assert(fe->hosts);
        } else if (fe->size == fe->used) {
                fe->size += 4;
                fe->hosts = realloc(fe->hosts, fe->size * sizeof(*(fe->hosts)));
                force_assert(fe->hosts);
        }

        fe->hosts[fe->used++] = fh;

        return 0;

}

INIT_FUNC(mod_fastcgi_init) {
        plugin_data *p;

        p = calloc(1, sizeof(*p));

        p->fcgi_env = buffer_init();

        p->path = buffer_init();

        p->statuskey = buffer_init();

        return p;
}


FREE_FUNC(mod_fastcgi_free) {
        plugin_data *p = p_d;

        UNUSED(srv);

        buffer_free(p->fcgi_env);
        buffer_free(p->path);
        buffer_free(p->statuskey);

        if (p->config_storage) {
                size_t i, j, n;
                for (i = 0; i < srv->config_context->used; i++) {
                        plugin_config *s = p->config_storage[i];
                        fcgi_exts *exts;

                        if (NULL == s) continue;

                        exts = s->exts;

                        for (j = 0; j < exts->used; j++) {
                                fcgi_extension *ex;

                                ex = exts->exts[j];

                                for (n = 0; n < ex->used; n++) {
                                        fcgi_proc *proc;
                                        fcgi_extension_host *host;

                                        host = ex->hosts[n];

                                        for (proc = host->first; proc; proc = proc->next) {
                                                if (proc->pid != 0) {
                                                        kill(proc->pid, host->kill_signal);
                                                }

                                                if (proc->is_local &&
                                                    !buffer_string_is_empty(proc->unixsocket)) {
                                                        unlink(proc->unixsocket->ptr);
                                                }
                                        }

                                        for (proc = host->unused_procs; proc; proc = proc->next) {
                                                if (proc->pid != 0) {
                                                        kill(proc->pid, host->kill_signal);
                                                }
                                                if (proc->is_local &&
                                                    !buffer_string_is_empty(proc->unixsocket)) {
                                                        unlink(proc->unixsocket->ptr);
                                                }
                                        }
                                }
                        }

                        fastcgi_extensions_free(s->exts);
                        array_free(s->ext_mapping);

                        free(s);
                }
                free(p->config_storage);
        }

        free(p);

        return HANDLER_GO_ON;
}

static int env_add(char_array *env, const char *key, size_t key_len, const char *val, size_t val_len) {
        char *dst;
        size_t i;

        if (!key || !val) return -1;

        dst = malloc(key_len + val_len + 3);
        memcpy(dst, key, key_len);
        dst[key_len] = '=';
        memcpy(dst + key_len + 1, val, val_len);
        dst[key_len + 1 + val_len] = '\0';

        for (i = 0; i < env->used; i++) {
                if (0 == strncmp(dst, env->ptr[i], key_len + 1)) {
                        /* don't care about free as we are in a forked child which is going to exec(...) */
                        /* free(env->ptr[i]); */
                        env->ptr[i] = dst;
                        return 0;
                }
        }

        if (env->size == 0) {
                env->size = 16;
                env->ptr = malloc(env->size * sizeof(*env->ptr));
        } else if (env->size == env->used + 1) {
                env->size += 16;
                env->ptr = realloc(env->ptr, env->size * sizeof(*env->ptr));
        }

        env->ptr[env->used++] = dst;

        return 0;
}

static int parse_binpath(char_array *env, buffer *b) {
        char *start;
        size_t i;
        /* search for spaces */

        start = b->ptr;
        for (i = 0; i < buffer_string_length(b); i++) {
                switch(b->ptr[i]) {
                case ' ':
                case '\t':
                        /* a WS, stop here and copy the argument */

                        if (env->size == 0) {
                                env->size = 16;
                                env->ptr = malloc(env->size * sizeof(*env->ptr));
                        } else if (env->size == env->used) {
                                env->size += 16;
                                env->ptr = realloc(env->ptr, env->size * sizeof(*env->ptr));
                        }

                        b->ptr[i] = '\0';

                        env->ptr[env->used++] = start;

                        start = b->ptr + i + 1;
                        break;
                default:
                        break;
                }
        }

        if (env->size == 0) {
                env->size = 16;
                env->ptr = malloc(env->size * sizeof(*env->ptr));
        } else if (env->size == env->used) { /* we need one extra for the terminating NULL */
                env->size += 16;
                env->ptr = realloc(env->ptr, env->size * sizeof(*env->ptr));
        }

        /* the rest */
        env->ptr[env->used++] = start;

        if (env->size == 0) {
                env->size = 16;
                env->ptr = malloc(env->size * sizeof(*env->ptr));
        } else if (env->size == env->used) { /* we need one extra for the terminating NULL */
                env->size += 16;
                env->ptr = realloc(env->ptr, env->size * sizeof(*env->ptr));
        }

        /* terminate */
        env->ptr[env->used++] = NULL;

        return 0;
}

#if !defined(HAVE_FORK)
static int fcgi_spawn_connection(server *srv,
                                 plugin_data *p,
                                 fcgi_extension_host *host,
                                 fcgi_proc *proc) {
        UNUSED(srv);
        UNUSED(p);
        UNUSED(host);
        UNUSED(proc);
        return -1;
}

#else /* -> defined(HAVE_FORK) */

static int fcgi_spawn_connection(server *srv,
                                 plugin_data *p,
                                 fcgi_extension_host *host,
                                 fcgi_proc *proc) {
        int fcgi_fd;
        int status;
        struct timeval tv = { 0, 100 * 1000 };
#ifdef HAVE_SYS_UN_H
        struct sockaddr_un fcgi_addr_un;
#endif
#if defined(HAVE_IPV6) && defined(HAVE_INET_PTON)
        struct sockaddr_in6 fcgi_addr_in6;
#endif
        struct sockaddr_in fcgi_addr_in;
        struct sockaddr *fcgi_addr;

        socklen_t servlen;

        if (p->conf.debug) {
                log_error_write(srv, __FILE__, __LINE__, "sdb",
                                "new proc, socket:", proc->port, proc->unixsocket);
        }

        if (!buffer_string_is_empty(proc->unixsocket)) {
#ifdef HAVE_SYS_UN_H
                memset(&fcgi_addr_un, 0, sizeof(fcgi_addr_un));
                fcgi_addr_un.sun_family = AF_UNIX;
                if (buffer_string_length(proc->unixsocket) + 1 > sizeof(fcgi_addr_un.sun_path)) {
                        log_error_write(srv, __FILE__, __LINE__, "sB",
                                        "ERROR: Unix Domain socket filename too long:",
                                        proc->unixsocket);
                        return -1;
                }
                memcpy(fcgi_addr_un.sun_path, proc->unixsocket->ptr, buffer_string_length(proc->unixsocket) + 1);

#ifdef SUN_LEN
                servlen = SUN_LEN(&fcgi_addr_un);
#else
                /* stevens says: */
                servlen = buffer_string_length(proc->unixsocket) + 1 + sizeof(fcgi_addr_un.sun_family);
#endif
                fcgi_addr = (struct sockaddr *) &fcgi_addr_un;

                buffer_copy_string_len(proc->connection_name, CONST_STR_LEN("unix:"));
                buffer_append_string_buffer(proc->connection_name, proc->unixsocket);

#else
                log_error_write(srv, __FILE__, __LINE__, "s",
                                "ERROR: Unix Domain sockets are not supported.");
                return -1;
#endif
#if defined(HAVE_IPV6) && defined(HAVE_INET_PTON)
        } else if (host->family == AF_INET6 && !buffer_string_is_empty(host->host)) {
                memset(&fcgi_addr_in6, 0, sizeof(fcgi_addr_in6));
                fcgi_addr_in6.sin6_family = AF_INET6;
                inet_pton(AF_INET6, host->host->ptr, (char *) &fcgi_addr_in6.sin6_addr);
                fcgi_addr_in6.sin6_port = htons(proc->port);
                servlen = sizeof(fcgi_addr_in6);
                fcgi_addr = (struct sockaddr *) &fcgi_addr_in6;
#endif
        } else {
                memset(&fcgi_addr_in, 0, sizeof(fcgi_addr_in));
                fcgi_addr_in.sin_family = AF_INET;

                if (buffer_string_is_empty(host->host)) {
                        fcgi_addr_in.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
                } else {
                        struct hostent *he;

                        /* set a useful default */
                        fcgi_addr_in.sin_addr.s_addr = htonl(INADDR_LOOPBACK);


                        if (NULL == (he = gethostbyname(host->host->ptr))) {
                                log_error_write(srv, __FILE__, __LINE__,
                                                "sdb", "gethostbyname failed: ",
                                                h_errno, host->host);
                                return -1;
                        }

                        if (he->h_addrtype != AF_INET) {
                                log_error_write(srv, __FILE__, __LINE__, "sd", "addr-type != AF_INET: ", he->h_addrtype);
                                return -1;
                        }

                        if (he->h_length != sizeof(struct in_addr)) {
                                log_error_write(srv, __FILE__, __LINE__, "sd", "addr-length != sizeof(in_addr): ", he->h_length);
                                return -1;
                        }

                        memcpy(&(fcgi_addr_in.sin_addr.s_addr), he->h_addr_list[0], he->h_length);

                }
                fcgi_addr_in.sin_port = htons(proc->port);
                servlen = sizeof(fcgi_addr_in);

                fcgi_addr = (struct sockaddr *) &fcgi_addr_in;
        }

        if (buffer_string_is_empty(proc->unixsocket)) {
                buffer_copy_string_len(proc->connection_name, CONST_STR_LEN("tcp:"));
                if (!buffer_string_is_empty(host->host)) {
                        buffer_append_string_buffer(proc->connection_name, host->host);
                } else {
                        buffer_append_string_len(proc->connection_name, CONST_STR_LEN("localhost"));
                }
                buffer_append_string_len(proc->connection_name, CONST_STR_LEN(":"));
                buffer_append_int(proc->connection_name, proc->port);
        }

        if (-1 == (fcgi_fd = socket(fcgi_addr->sa_family, SOCK_STREAM, 0))) {
                log_error_write(srv, __FILE__, __LINE__, "ss",
                                "failed:", strerror(errno));
                return -1;
        }

        if (-1 == connect(fcgi_fd, fcgi_addr, servlen)) {
                /* server is not up, spawn it  */
                pid_t child;
                int val;

                if (errno != ENOENT &&
                    !buffer_string_is_empty(proc->unixsocket)) {
                        unlink(proc->unixsocket->ptr);
                }

                close(fcgi_fd);

                /* reopen socket */
                if (-1 == (fcgi_fd = socket(fcgi_addr->sa_family, SOCK_STREAM, 0))) {
                        log_error_write(srv, __FILE__, __LINE__, "ss",
                                "socket failed:", strerror(errno));
                        return -1;
                }

                val = 1;
                if (setsockopt(fcgi_fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0) {
                        log_error_write(srv, __FILE__, __LINE__, "ss",
                                        "socketsockopt failed:", strerror(errno));
                        close(fcgi_fd);
                        return -1;
                }

                /* create socket */
                if (-1 == bind(fcgi_fd, fcgi_addr, servlen)) {
                        log_error_write(srv, __FILE__, __LINE__, "sbs",
                                "bind failed for:",
                                proc->connection_name,
                                strerror(errno));
                        close(fcgi_fd);
                        return -1;
                }

                if (-1 == listen(fcgi_fd, host->listen_backlog)) {
                        log_error_write(srv, __FILE__, __LINE__, "ss",
                                "listen failed:", strerror(errno));
                        close(fcgi_fd);
                        return -1;
                }

                switch ((child = fork())) {
                case 0: {
                        size_t i = 0;
                        char *c;
                        char_array env;
                        char_array arg;

                        /* create environment */
                        env.ptr = NULL;
                        env.size = 0;
                        env.used = 0;

                        arg.ptr = NULL;
                        arg.size = 0;
                        arg.used = 0;

                        if(fcgi_fd != FCGI_LISTENSOCK_FILENO) {
                                close(FCGI_LISTENSOCK_FILENO);
                                dup2(fcgi_fd, FCGI_LISTENSOCK_FILENO);
                                close(fcgi_fd);
                        }

                        /* we don't need the client socket */
                        for (i = 3; i < 256; i++) {
                                close(i);
                        }

                        /* build clean environment */
                        if (host->bin_env_copy->used) {
                                for (i = 0; i < host->bin_env_copy->used; i++) {
                                        data_string *ds = (data_string *)host->bin_env_copy->data[i];
                                        char *ge;

                                        if (NULL != (ge = getenv(ds->value->ptr))) {
                                                env_add(&env, CONST_BUF_LEN(ds->value), ge, strlen(ge));
                                        }
                                }
                        } else {
                                char ** const e = environ;
                                for (i = 0; e[i]; ++i) {
                                        char *eq;

                                        if (NULL != (eq = strchr(e[i], '='))) {
                                                env_add(&env, e[i], eq - e[i], eq+1, strlen(eq+1));
                                        }
                                }
                        }

                        /* create environment */
                        for (i = 0; i < host->bin_env->used; i++) {
                                data_string *ds = (data_string *)host->bin_env->data[i];

                                env_add(&env, CONST_BUF_LEN(ds->key), CONST_BUF_LEN(ds->value));
                        }

                        for (i = 0; i < env.used; i++) {
                                /* search for PHP_FCGI_CHILDREN */
                                if (0 == strncmp(env.ptr[i], "PHP_FCGI_CHILDREN=", sizeof("PHP_FCGI_CHILDREN=") - 1)) break;
                        }

                        /* not found, add a default */
                        if (i == env.used) {
                                env_add(&env, CONST_STR_LEN("PHP_FCGI_CHILDREN"), CONST_STR_LEN("1"));
                        }

                        env.ptr[env.used] = NULL;

                        parse_binpath(&arg, host->bin_path);

                        /* chdir into the base of the bin-path,
                         * search for the last / */
                        if (NULL != (c = strrchr(arg.ptr[0], '/'))) {
                                *c = '\0';

                                /* change to the physical directory */
                                if (-1 == chdir(arg.ptr[0])) {
                                        *c = '/';
                                        log_error_write(srv, __FILE__, __LINE__, "sss", "chdir failed:", strerror(errno), arg.ptr[0]);
                                }
                                *c = '/';
                        }

                        reset_signals();

                        /* exec the cgi */
                        execve(arg.ptr[0], arg.ptr, env.ptr);

                        /* log_error_write(srv, __FILE__, __LINE__, "sbs",
                                        "execve failed for:", host->bin_path, strerror(errno)); */

                        _exit(errno);

                        break;
                }
                case -1:
                        /* error */
                        close(fcgi_fd);
                        break;
                default:
                        /* father */
                        close(fcgi_fd);

                        /* wait */
                        select(0, NULL, NULL, NULL, &tv);

                        switch (waitpid(child, &status, WNOHANG)) {
                        case 0:
                                /* child still running after timeout, good */
                                break;
                        case -1:
                                /* no PID found ? should never happen */
                                log_error_write(srv, __FILE__, __LINE__, "ss",
                                                "pid not found:", strerror(errno));
                                return -1;
                        default:
                                log_error_write(srv, __FILE__, __LINE__, "sbs",
                                                "the fastcgi-backend", host->bin_path, "failed to start:");
                                /* the child should not terminate at all */
                                if (WIFEXITED(status)) {
                                        log_error_write(srv, __FILE__, __LINE__, "sdb",
                                                        "child exited with status",
                                                        WEXITSTATUS(status), host->bin_path);
                                        log_error_write(srv, __FILE__, __LINE__, "s",
                                                        "If you're trying to run your app as a FastCGI backend, make sure you're using the FastCGI-enabled version.\n"
                                                        "If this is PHP on Gentoo, add 'fastcgi' to the USE flags.");
                                } else if (WIFSIGNALED(status)) {
                                        log_error_write(srv, __FILE__, __LINE__, "sd",
                                                        "terminated by signal:",
                                                        WTERMSIG(status));

                                        if (WTERMSIG(status) == 11) {
                                                log_error_write(srv, __FILE__, __LINE__, "s",
                                                                "to be exact: it segfaulted, crashed, died, ... you get the idea." );
                                                log_error_write(srv, __FILE__, __LINE__, "s",
                                                                "If this is PHP, try removing the bytecode caches for now and try again.");
                                        }
                                } else {
                                        log_error_write(srv, __FILE__, __LINE__, "sd",
                                                        "child died somehow:",
                                                        status);
                                }
                                return -1;
                        }

                        /* register process */
                        proc->pid = child;
                        proc->is_local = 1;

                        break;
                }
        } else {
                close(fcgi_fd);
                proc->is_local = 0;
                proc->pid = 0;

                if (p->conf.debug) {
                        log_error_write(srv, __FILE__, __LINE__, "sb",
                                        "(debug) socket is already used; won't spawn:",
                                        proc->connection_name);
                }
        }

        proc->state = PROC_STATE_RUNNING;
        host->active_procs++;

        return 0;
}

#endif /* HAVE_FORK */

static fcgi_extension_host * unixsocket_is_dup(plugin_data *p, size_t used, buffer *unixsocket) {
        size_t i, j, n;
        for (i = 0; i < used; ++i) {
                fcgi_exts *exts = p->config_storage[i]->exts;
                for (j = 0; j < exts->used; ++j) {
                        fcgi_extension *ex = exts->exts[j];
                        for (n = 0; n < ex->used; ++n) {
                                fcgi_extension_host *host = ex->hosts[n];
                                if (!buffer_string_is_empty(host->unixsocket)
                                    && buffer_is_equal(host->unixsocket, unixsocket)
                                    && !buffer_string_is_empty(host->bin_path))
                                        return host;
                        }
                }
        }

        return NULL;
}

SETDEFAULTS_FUNC(mod_fastcgi_set_defaults) {
        plugin_data *p = p_d;
        data_unset *du;
        size_t i = 0;
        buffer *fcgi_mode = buffer_init();
        fcgi_extension_host *host = NULL;

        config_values_t cv[] = {
                { "fastcgi.server",              NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION },       /* 0 */
                { "fastcgi.debug",               NULL, T_CONFIG_INT  , T_CONFIG_SCOPE_CONNECTION },       /* 1 */
                { "fastcgi.map-extensions",      NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION },       /* 2 */
                { NULL,                          NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
        };

        p->config_storage = calloc(1, srv->config_context->used * sizeof(plugin_config *));

        for (i = 0; i < srv->config_context->used; i++) {
                data_config const* config = (data_config const*)srv->config_context->data[i];
                plugin_config *s;

                s = malloc(sizeof(plugin_config));
                s->exts          = fastcgi_extensions_init();
                s->debug         = 0;
                s->ext_mapping   = array_init();

                cv[0].destination = s->exts;
                cv[1].destination = &(s->debug);
                cv[2].destination = s->ext_mapping;

                p->config_storage[i] = s;

                if (0 != config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) {
                        goto error;
                }

                /*
                 * <key> = ( ... )
                 */

                if (NULL != (du = array_get_element(config->value, "fastcgi.server"))) {
                        size_t j;
                        data_array *da = (data_array *)du;

                        if (du->type != TYPE_ARRAY) {
                                log_error_write(srv, __FILE__, __LINE__, "sss",
                                                "unexpected type for key: ", "fastcgi.server", "expected ( \"ext\" => ( \"backend-label\" => ( \"key\" => \"value\" )))");

                                goto error;
                        }


                        /*
                         * fastcgi.server = ( "<ext>" => ( ... ),
                         *                    "<ext>" => ( ... ) )
                         */

                        for (j = 0; j < da->value->used; j++) {
                                size_t n;
                                data_array *da_ext = (data_array *)da->value->data[j];

                                if (da->value->data[j]->type != TYPE_ARRAY) {
                                        log_error_write(srv, __FILE__, __LINE__, "sssbs",
                                                        "unexpected type for key: ", "fastcgi.server",
                                                        "[", da->value->data[j]->key, "](string); expected ( \"ext\" => ( \"backend-label\" => ( \"key\" => \"value\" )))");

                                        goto error;
                                }

                                /*
                                 * da_ext->key == name of the extension
                                 */

                                /*
                                 * fastcgi.server = ( "<ext>" =>
                                 *                     ( "<host>" => ( ... ),
                                 *                       "<host>" => ( ... )
                                 *                     ),
                                 *                    "<ext>" => ... )
                                 */

                                for (n = 0; n < da_ext->value->used; n++) {
                                        data_array *da_host = (data_array *)da_ext->value->data[n];

                                        config_values_t fcv[] = {
                                                { "host",              NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },       /* 0 */
                                                { "docroot",           NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },       /* 1 */
                                                { "mode",              NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },       /* 2 */
                                                { "socket",            NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },       /* 3 */
                                                { "bin-path",          NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },       /* 4 */

                                                { "check-local",       NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION },      /* 5 */
                                                { "port",              NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION },        /* 6 */
                                                { "max-procs",         NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION },        /* 7 */
                                                { "disable-time",      NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION },        /* 8 */

                                                { "bin-environment",   NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION },        /* 9 */
                                                { "bin-copy-environment", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION },     /* 10 */

                                                { "broken-scriptfilename", NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION },  /* 11 */
                                                { "allow-x-send-file",  NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION },     /* 12 */
                                                { "strip-request-uri",  NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },      /* 13 */
                                                { "kill-signal",        NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION },       /* 14 */
                                                { "fix-root-scriptname",   NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION },  /* 15 */
                                                { "listen-backlog",    NULL, T_CONFIG_INT,   T_CONFIG_SCOPE_CONNECTION },        /* 16 */
                                                { "x-sendfile",        NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION },      /* 17 */
                                                { "x-sendfile-docroot",NULL, T_CONFIG_ARRAY,  T_CONFIG_SCOPE_CONNECTION },      /* 18 */

                                                { NULL,                NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
                                        };

                                        if (da_host->type != TYPE_ARRAY) {
                                                log_error_write(srv, __FILE__, __LINE__, "ssSBS",
                                                                "unexpected type for key:",
                                                                "fastcgi.server",
                                                                "[", da_host->key, "](string); expected ( \"ext\" => ( \"backend-label\" => ( \"key\" => \"value\" )))");

                                                goto error;
                                        }

                                        host = fastcgi_host_init();
                                        buffer_reset(fcgi_mode);

                                        buffer_copy_buffer(host->id, da_host->key);

                                        host->check_local  = 1;
                                        host->max_procs    = 4;
                                        host->mode = FCGI_RESPONDER;
                                        host->disable_time = 1;
                                        host->break_scriptfilename_for_php = 0;
                                        host->xsendfile_allow = 0;
                                        host->kill_signal = SIGTERM;
                                        host->fix_root_path_name = 0;
                                        host->listen_backlog = 1024;
                                        host->refcount = 0;

                                        fcv[0].destination = host->host;
                                        fcv[1].destination = host->docroot;
                                        fcv[2].destination = fcgi_mode;
                                        fcv[3].destination = host->unixsocket;
                                        fcv[4].destination = host->bin_path;

                                        fcv[5].destination = &(host->check_local);
                                        fcv[6].destination = &(host->port);
                                        fcv[7].destination = &(host->max_procs);
                                        fcv[8].destination = &(host->disable_time);

                                        fcv[9].destination = host->bin_env;
                                        fcv[10].destination = host->bin_env_copy;
                                        fcv[11].destination = &(host->break_scriptfilename_for_php);
                                        fcv[12].destination = &(host->xsendfile_allow);
                                        fcv[13].destination = host->strip_request_uri;
                                        fcv[14].destination = &(host->kill_signal);
                                        fcv[15].destination = &(host->fix_root_path_name);
                                        fcv[16].destination = &(host->listen_backlog);
                                        fcv[17].destination = &(host->xsendfile_allow);
                                        fcv[18].destination = host->xsendfile_docroot;

                                        if (0 != config_insert_values_internal(srv, da_host->value, fcv, T_CONFIG_SCOPE_CONNECTION)) {
                                                goto error;
                                        }

                                        if ((!buffer_string_is_empty(host->host) || host->port) &&
                                            !buffer_string_is_empty(host->unixsocket)) {
                                                log_error_write(srv, __FILE__, __LINE__, "sbsbsbs",
                                                                "either host/port or socket have to be set in:",
                                                                da->key, "= (",
                                                                da_ext->key, " => (",
                                                                da_host->key, " ( ...");

                                                goto error;
                                        }

                                        if (!buffer_string_is_empty(host->unixsocket)) {
                                                /* unix domain socket */
                                                struct sockaddr_un un;

                                                if (buffer_string_length(host->unixsocket) + 1 > sizeof(un.sun_path) - 2) {
                                                        log_error_write(srv, __FILE__, __LINE__, "sbsbsbs",
                                                                        "unixsocket is too long in:",
                                                                        da->key, "= (",
                                                                        da_ext->key, " => (",
                                                                        da_host->key, " ( ...");

                                                        goto error;
                                                }

                                                if (!buffer_string_is_empty(host->bin_path)) {
                                                        fcgi_extension_host *duplicate = unixsocket_is_dup(p, i+1, host->unixsocket);
                                                        if (NULL != duplicate) {
                                                                if (!buffer_is_equal(host->bin_path, duplicate->bin_path)) {
                                                                        log_error_write(srv, __FILE__, __LINE__, "sb",
                                                                                "duplicate unixsocket path:",
                                                                                host->unixsocket);
                                                                        goto error;
                                                                }
                                                                fastcgi_host_free(host);
                                                                host = duplicate;
                                                                ++host->refcount;
                                                        }
                                                }

                                                host->family = AF_UNIX;
                                        } else {
                                                /* tcp/ip */

                                                if (buffer_string_is_empty(host->host) &&
                                                    buffer_string_is_empty(host->bin_path)) {
                                                        log_error_write(srv, __FILE__, __LINE__, "sbsbsbs",
                                                                        "host or binpath have to be set in:",
                                                                        da->key, "= (",
                                                                        da_ext->key, " => (",
                                                                        da_host->key, " ( ...");

                                                        goto error;
                                                } else if (host->port == 0) {
                                                        log_error_write(srv, __FILE__, __LINE__, "sbsbsbs",
                                                                        "port has to be set in:",
                                                                        da->key, "= (",
                                                                        da_ext->key, " => (",
                                                                        da_host->key, " ( ...");

                                                        goto error;
                                                }

                                                host->family = (!buffer_string_is_empty(host->host) && NULL != strchr(host->host->ptr, ':')) ? AF_INET6 : AF_INET;
                                        }

                                        if (host->refcount) {
                                                /* already init'd; skip spawning */
                                        } else if (!buffer_string_is_empty(host->bin_path)) {
                                                /* a local socket + self spawning */
                                                size_t pno;

                                                if (s->debug) {
                                                        log_error_write(srv, __FILE__, __LINE__, "ssbsdsbsd",
                                                                        "--- fastcgi spawning local",
                                                                        "\n\tproc:", host->bin_path,
                                                                        "\n\tport:", host->port,
                                                                        "\n\tsocket", host->unixsocket,
                                                                        "\n\tmax-procs:", host->max_procs);
                                                }

                                                for (pno = 0; pno < host->max_procs; pno++) {
                                                        fcgi_proc *proc;

                                                        proc = fastcgi_process_init();
                                                        proc->id = host->num_procs++;
                                                        host->max_id++;

                                                        if (buffer_string_is_empty(host->unixsocket)) {
                                                                proc->port = host->port + pno;
                                                        } else {
                                                                buffer_copy_buffer(proc->unixsocket, host->unixsocket);
                                                                buffer_append_string_len(proc->unixsocket, CONST_STR_LEN("-"));
                                                                buffer_append_int(proc->unixsocket, pno);
                                                        }

                                                        if (s->debug) {
                                                                log_error_write(srv, __FILE__, __LINE__, "ssdsbsdsd",
                                                                                "--- fastcgi spawning",
                                                                                "\n\tport:", host->port,
                                                                                "\n\tsocket", host->unixsocket,
                                                                                "\n\tcurrent:", pno, "/", host->max_procs);
                                                        }

                                                        if (!srv->srvconf.preflight_check
                                                            && fcgi_spawn_connection(srv, p, host, proc)) {
                                                                log_error_write(srv, __FILE__, __LINE__, "s",
                                                                                "[ERROR]: spawning fcgi failed.");
                                                                fastcgi_process_free(proc);
                                                                goto error;
                                                        }

                                                        fastcgi_status_init(srv, p->statuskey, host, proc);

                                                        proc->next = host->first;
                                                        if (host->first) host->first->prev = proc;

                                                        host->first = proc;
                                                }
                                        } else {
                                                fcgi_proc *proc;

                                                proc = fastcgi_process_init();
                                                proc->id = host->num_procs++;
                                                host->max_id++;
                                                host->active_procs++;
                                                proc->state = PROC_STATE_RUNNING;

                                                if (buffer_string_is_empty(host->unixsocket)) {
                                                        proc->port = host->port;
                                                } else {
                                                        buffer_copy_buffer(proc->unixsocket, host->unixsocket);
                                                }

                                                fastcgi_status_init(srv, p->statuskey, host, proc);

                                                host->first = proc;

                                                host->max_procs = 1;
                                        }

                                        if (!buffer_string_is_empty(fcgi_mode)) {
                                                if (strcmp(fcgi_mode->ptr, "responder") == 0) {
                                                        host->mode = FCGI_RESPONDER;
                                                } else if (strcmp(fcgi_mode->ptr, "authorizer") == 0) {
                                                        host->mode = FCGI_AUTHORIZER;
                                                        if (buffer_string_is_empty(host->docroot)) {
                                                                log_error_write(srv, __FILE__, __LINE__, "s",
                                                                                "ERROR: docroot is required for authorizer mode.");
                                                                goto error;
                                                        }
                                                } else {
                                                        log_error_write(srv, __FILE__, __LINE__, "sbs",
                                                                        "WARNING: unknown fastcgi mode:",
                                                                        fcgi_mode, "(ignored, mode set to responder)");
                                                }
                                        }

                                        if (host->xsendfile_docroot->used) {
                                                size_t k;
                                                for (k = 0; k < host->xsendfile_docroot->used; ++k) {
                                                        data_string *ds = (data_string *)host->xsendfile_docroot->data[k];
                                                        if (ds->type != TYPE_STRING) {
                                                                log_error_write(srv, __FILE__, __LINE__, "s",
                                                                        "unexpected type for x-sendfile-docroot; expected: \"x-sendfile-docroot\" => ( \"/allowed/path\", ... )");
                                                                goto error;
                                                        }
                                                        if (ds->value->ptr[0] != '/') {
                                                                log_error_write(srv, __FILE__, __LINE__, "SBs",
                                                                        "x-sendfile-docroot paths must begin with '/'; invalid: \"", ds->value, "\"");
                                                                goto error;
                                                        }
                                                        buffer_path_simplify(ds->value, ds->value);
                                                        buffer_append_slash(ds->value);
                                                }
                                        }

                                        /* if extension already exists, take it */
                                        fastcgi_extension_insert(s->exts, da_ext->key, host);
                                        host = NULL;
                                }
                        }
                }
        }

        buffer_free(fcgi_mode);
        return HANDLER_GO_ON;

error:
        if (NULL != host) fastcgi_host_free(host);
        buffer_free(fcgi_mode);
        return HANDLER_ERROR;
}

static int fcgi_set_state(server *srv, handler_ctx *hctx, fcgi_connection_state_t state) {
        hctx->state = state;
        hctx->state_timestamp = srv->cur_ts;

        return 0;
}


static void fcgi_connection_close(server *srv, handler_ctx *hctx) {
        plugin_data *p;
        connection  *con;

        p    = hctx->plugin_data;
        con  = hctx->remote_conn;

        if (hctx->fd != -1) {
                fdevent_event_del(srv->ev, &(hctx->fde_ndx), hctx->fd);
                fdevent_unregister(srv->ev, hctx->fd);
                close(hctx->fd);
                srv->cur_fds--;
        }

        if (hctx->host && hctx->proc) {
                if (hctx->got_proc) {
                        /* after the connect the process gets a load */
                        fcgi_proc_load_dec(srv, hctx);

                        if (p->conf.debug) {
                                log_error_write(srv, __FILE__, __LINE__, "ssdsbsd",
                                                "released proc:",
                                                "pid:", hctx->proc->pid,
                                                "socket:", hctx->proc->connection_name,
                                                "load:", hctx->proc->load);
                        }
                }
        }


        handler_ctx_free(srv, hctx);
        con->plugin_ctx[p->id] = NULL;

        /* finish response (if not already con->file_started, con->file_finished) */
        if (con->mode == p->id) {
                http_response_backend_done(srv, con);
        }
}

static int fcgi_reconnect(server *srv, handler_ctx *hctx) {
        plugin_data *p    = hctx->plugin_data;

        /* child died
         *
         * 1.
         *
         * connect was ok, connection was accepted
         * but the php accept loop checks after the accept if it should die or not.
         *
         * if yes we can only detect it at a write()
         *
         * next step is resetting this attemp and setup a connection again
         *
         * if we have more than 5 reconnects for the same request, die
         *
         * 2.
         *
         * we have a connection but the child died by some other reason
         *
         */

        if (hctx->fd != -1) {
                fdevent_event_del(srv->ev, &(hctx->fde_ndx), hctx->fd);
                fdevent_unregister(srv->ev, hctx->fd);
                close(hctx->fd);
                srv->cur_fds--;
                hctx->fd = -1;
        }

        fcgi_set_state(srv, hctx, FCGI_STATE_INIT);

        hctx->request_id = 0;
        hctx->reconnects++;

        if (p->conf.debug > 2) {
                if (hctx->proc) {
                        log_error_write(srv, __FILE__, __LINE__, "sdb",
                                        "release proc for reconnect:",
                                        hctx->proc->pid, hctx->proc->connection_name);
                } else {
                        log_error_write(srv, __FILE__, __LINE__, "sb",
                                        "release proc for reconnect:",
                                        hctx->host->unixsocket);
                }
        }

        if (hctx->proc && hctx->got_proc) {
                fcgi_proc_load_dec(srv, hctx);
        }

        /* perhaps another host gives us more luck */
        fcgi_host_reset(srv, hctx);

        return 0;
}


static handler_t fcgi_connection_reset(server *srv, connection *con, void *p_d) {
        plugin_data *p = p_d;
        handler_ctx *hctx = con->plugin_ctx[p->id];
        if (hctx) fcgi_connection_close(srv, hctx);

        return HANDLER_GO_ON;
}


static int fcgi_env_add(buffer *env, const char *key, size_t key_len, const char *val, size_t val_len) {
        size_t len;
        char len_enc[8];
        size_t len_enc_len = 0;

        if (!key || !val) return -1;

        len = key_len + val_len;

        len += key_len > 127 ? 4 : 1;
        len += val_len > 127 ? 4 : 1;

        if (buffer_string_length(env) + len >= FCGI_MAX_LENGTH) {
                /**
                 * we can't append more headers, ignore it
                 */
                return -1;
        }

        /**
         * field length can be 31bit max
         *
         * HINT: this can't happen as FCGI_MAX_LENGTH is only 16bit
         */
        force_assert(key_len < 0x7fffffffu);
        force_assert(val_len < 0x7fffffffu);

        buffer_string_prepare_append(env, len);

        if (key_len > 127) {
                len_enc[len_enc_len++] = ((key_len >> 24) & 0xff) | 0x80;
                len_enc[len_enc_len++] = (key_len >> 16) & 0xff;
                len_enc[len_enc_len++] = (key_len >> 8) & 0xff;
                len_enc[len_enc_len++] = (key_len >> 0) & 0xff;
        } else {
                len_enc[len_enc_len++] = (key_len >> 0) & 0xff;
        }

        if (val_len > 127) {
                len_enc[len_enc_len++] = ((val_len >> 24) & 0xff) | 0x80;
                len_enc[len_enc_len++] = (val_len >> 16) & 0xff;
                len_enc[len_enc_len++] = (val_len >> 8) & 0xff;
                len_enc[len_enc_len++] = (val_len >> 0) & 0xff;
        } else {
                len_enc[len_enc_len++] = (val_len >> 0) & 0xff;
        }

        buffer_append_string_len(env, len_enc, len_enc_len);
        buffer_append_string_len(env, key, key_len);
        buffer_append_string_len(env, val, val_len);

        return 0;
}

static int fcgi_header(FCGI_Header * header, unsigned char type, int request_id, int contentLength, unsigned char paddingLength) {
        force_assert(contentLength <= FCGI_MAX_LENGTH);
        
        header->version = FCGI_VERSION_1;
        header->type = type;
        header->requestIdB0 = request_id & 0xff;
        header->requestIdB1 = (request_id >> 8) & 0xff;
        header->contentLengthB0 = contentLength & 0xff;
        header->contentLengthB1 = (contentLength >> 8) & 0xff;
        header->paddingLength = paddingLength;
        header->reserved = 0;

        return 0;
}

typedef enum {
        CONNECTION_OK,
        CONNECTION_DELAYED, /* retry after event, take same host */
        CONNECTION_OVERLOADED, /* disable for 1 second, take another backend */
        CONNECTION_DEAD /* disable for 60 seconds, take another backend */
} connection_result_t;

static connection_result_t fcgi_establish_connection(server *srv, handler_ctx *hctx) {
        struct sockaddr *fcgi_addr;
        struct sockaddr_in fcgi_addr_in;
#if defined(HAVE_IPV6) && defined(HAVE_INET_PTON)
        struct sockaddr_in6 fcgi_addr_in6;
#endif
#ifdef HAVE_SYS_UN_H
        struct sockaddr_un fcgi_addr_un;
#endif
        socklen_t servlen;

        fcgi_extension_host *host = hctx->host;
        fcgi_proc *proc   = hctx->proc;
        int fcgi_fd       = hctx->fd;

        if (!buffer_string_is_empty(proc->unixsocket)) {
#ifdef HAVE_SYS_UN_H
                /* use the unix domain socket */
                memset(&fcgi_addr_un, 0, sizeof(fcgi_addr_un));
                fcgi_addr_un.sun_family = AF_UNIX;
                if (buffer_string_length(proc->unixsocket) + 1 > sizeof(fcgi_addr_un.sun_path)) {
                        log_error_write(srv, __FILE__, __LINE__, "sB",
                                        "ERROR: Unix Domain socket filename too long:",
                                        proc->unixsocket);
                        return -1;
                }
                memcpy(fcgi_addr_un.sun_path, proc->unixsocket->ptr, buffer_string_length(proc->unixsocket) + 1);

#ifdef SUN_LEN
                servlen = SUN_LEN(&fcgi_addr_un);
#else
                /* stevens says: */
                servlen = buffer_string_length(proc->unixsocket) + 1 + sizeof(fcgi_addr_un.sun_family);
#endif
                fcgi_addr = (struct sockaddr *) &fcgi_addr_un;

                if (buffer_string_is_empty(proc->connection_name)) {
                        /* on remote spawing we have to set the connection-name now */
                        buffer_copy_string_len(proc->connection_name, CONST_STR_LEN("unix:"));
                        buffer_append_string_buffer(proc->connection_name, proc->unixsocket);
                }
#else
                return CONNECTION_DEAD;
#endif
#if defined(HAVE_IPV6) && defined(HAVE_INET_PTON)
        } else if (host->family == AF_INET6 && !buffer_string_is_empty(host->host)) {
                memset(&fcgi_addr_in6, 0, sizeof(fcgi_addr_in6));
                fcgi_addr_in6.sin6_family = AF_INET6;
                inet_pton(AF_INET6, host->host->ptr, (char *) &fcgi_addr_in6.sin6_addr);
                fcgi_addr_in6.sin6_port = htons(proc->port);
                servlen = sizeof(fcgi_addr_in6);
                fcgi_addr = (struct sockaddr *) &fcgi_addr_in6;
#endif
        } else {
                memset(&fcgi_addr_in, 0, sizeof(fcgi_addr_in));
                fcgi_addr_in.sin_family = AF_INET;
                if (!buffer_string_is_empty(host->host)) {
                        if (0 == inet_aton(host->host->ptr, &(fcgi_addr_in.sin_addr))) {
                                log_error_write(srv, __FILE__, __LINE__, "sbs",
                                                "converting IP address failed for", host->host,
                                                "\nBe sure to specify an IP address here");
        
                                return CONNECTION_DEAD;
                        }
                } else {
                        fcgi_addr_in.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
                }
                fcgi_addr_in.sin_port = htons(proc->port);
                servlen = sizeof(fcgi_addr_in);

                fcgi_addr = (struct sockaddr *) &fcgi_addr_in;
        }

        if (buffer_string_is_empty(proc->unixsocket)) {
                if (buffer_string_is_empty(proc->connection_name)) {
                        /* on remote spawing we have to set the connection-name now */
                        buffer_copy_string_len(proc->connection_name, CONST_STR_LEN("tcp:"));
                        if (!buffer_string_is_empty(host->host)) {
                                buffer_append_string_buffer(proc->connection_name, host->host);
                        } else {
                                buffer_append_string_len(proc->connection_name, CONST_STR_LEN("localhost"));
                        }
                        buffer_append_string_len(proc->connection_name, CONST_STR_LEN(":"));
                        buffer_append_int(proc->connection_name, proc->port);
                }
        }

        if (-1 == connect(fcgi_fd, fcgi_addr, servlen)) {
                if (errno == EINPROGRESS ||
                    errno == EALREADY ||
                    errno == EINTR) {
                        if (hctx->conf.debug > 2) {
                                log_error_write(srv, __FILE__, __LINE__, "sb",
                                        "connect delayed; will continue later:", proc->connection_name);
                        }

                        return CONNECTION_DELAYED;
                } else if (errno == EAGAIN) {
                        if (hctx->conf.debug) {
                                log_error_write(srv, __FILE__, __LINE__, "sbsd",
                                        "This means that you have more incoming requests than your FastCGI backend can handle in parallel."
                                        "It might help to spawn more FastCGI backends or PHP children; if not, decrease server.max-connections."
                                        "The load for this FastCGI backend", proc->connection_name, "is", proc->load);
                        }

                        return CONNECTION_OVERLOADED;
                } else {
                        log_error_write(srv, __FILE__, __LINE__, "sssb",
                                        "connect failed:",
                                        strerror(errno), "on",
                                        proc->connection_name);

                        return CONNECTION_DEAD;
                }
        }

        hctx->reconnects = 0;
        if (hctx->conf.debug > 1) {
                log_error_write(srv, __FILE__, __LINE__, "sd",
                                "connect succeeded: ", fcgi_fd);
        }

        return CONNECTION_OK;
}

#define FCGI_ENV_ADD_CHECK(ret, con) \
        if (ret == -1) { \
                con->http_status = 400; \
                return -1; \
        };
static int fcgi_env_add_request_headers(server *srv, connection *con, plugin_data *p) {
        size_t i;

        for (i = 0; i < con->request.headers->used; i++) {
                data_string *ds;

                ds = (data_string *)con->request.headers->data[i];

                if (!buffer_is_empty(ds->value) && !buffer_is_empty(ds->key)) {
                        /* Do not emit HTTP_PROXY in environment.
                         * Some executables use HTTP_PROXY to configure
                         * outgoing proxy.  See also https://httpoxy.org/ */
                        if (buffer_is_equal_caseless_string(ds->key, CONST_STR_LEN("Proxy"))) {
                                continue;
                        }

                        buffer_copy_string_encoded_cgi_varnames(srv->tmp_buf, CONST_BUF_LEN(ds->key), 1);

                        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_BUF_LEN(srv->tmp_buf), CONST_BUF_LEN(ds->value)),con);
                }
        }

        for (i = 0; i < con->environment->used; i++) {
                data_string *ds;

                ds = (data_string *)con->environment->data[i];

                if (!buffer_is_empty(ds->value) && !buffer_is_empty(ds->key)) {
                        buffer_copy_string_encoded_cgi_varnames(srv->tmp_buf, CONST_BUF_LEN(ds->key), 0);

                        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_BUF_LEN(srv->tmp_buf), CONST_BUF_LEN(ds->value)), con);
                }
        }

        return 0;
}

static void fcgi_stdin_append(server *srv, connection *con, handler_ctx *hctx, int request_id) {
        FCGI_Header header;
        chunkqueue *req_cq = con->request_content_queue;
        plugin_data *p     = hctx->plugin_data;
        off_t offset, weWant;
        const off_t req_cqlen = req_cq->bytes_in - req_cq->bytes_out;

        /* something to send ? */
        for (offset = 0; offset != req_cqlen; offset += weWant) {
                weWant = req_cqlen - offset > FCGI_MAX_LENGTH ? FCGI_MAX_LENGTH : req_cqlen - offset;

                /* we announce toWrite octets
                 * now take all request_content chunks available
                 * */

                fcgi_header(&(header), FCGI_STDIN, request_id, weWant, 0);
                chunkqueue_append_mem(hctx->wb, (const char *)&header, sizeof(header));
                hctx->wb_reqlen += sizeof(header);

                if (p->conf.debug > 10) {
                        log_error_write(srv, __FILE__, __LINE__, "soso", "tosend:", offset, "/", req_cqlen);
                }

                chunkqueue_steal(hctx->wb, req_cq, weWant);
                /*(hctx->wb_reqlen already includes content_length)*/
        }

        if (hctx->wb->bytes_in == hctx->wb_reqlen) {
                /* terminate STDIN */
                fcgi_header(&(header), FCGI_STDIN, request_id, 0, 0);
                chunkqueue_append_mem(hctx->wb, (const char *)&header, sizeof(header));
                hctx->wb_reqlen += (int)sizeof(header);
        }
}

static int fcgi_create_env(server *srv, handler_ctx *hctx, int request_id) {
        FCGI_BeginRequestRecord beginRecord;
        FCGI_Header header;

        char buf[LI_ITOSTRING_LENGTH];
        const char *s;
#ifdef HAVE_IPV6
        char b2[INET6_ADDRSTRLEN + 1];
#endif

        plugin_data *p    = hctx->plugin_data;
        fcgi_extension_host *host= hctx->host;

        connection *con   = hctx->remote_conn;
        buffer * const req_uri = con->request.orig_uri;
        server_socket *srv_sock = con->srv_socket;

        sock_addr our_addr;
        socklen_t our_addr_len;

        /* send FCGI_BEGIN_REQUEST */

        fcgi_header(&(beginRecord.header), FCGI_BEGIN_REQUEST, request_id, sizeof(beginRecord.body), 0);
        beginRecord.body.roleB0 = host->mode;
        beginRecord.body.roleB1 = 0;
        beginRecord.body.flags = 0;
        memset(beginRecord.body.reserved, 0, sizeof(beginRecord.body.reserved));

        /* send FCGI_PARAMS */
        buffer_string_prepare_copy(p->fcgi_env, 1023);

        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("SERVER_SOFTWARE"), CONST_BUF_LEN(con->conf.server_tag)),con)

        if (!buffer_is_empty(con->server_name)) {
                size_t len = buffer_string_length(con->server_name);

                if (con->server_name->ptr[0] == '[') {
                        const char *colon = strstr(con->server_name->ptr, "]:");
                        if (colon) len = (colon + 1) - con->server_name->ptr;
                } else {
                        const char *colon = strchr(con->server_name->ptr, ':');
                        if (colon) len = colon - con->server_name->ptr;
                }

                FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("SERVER_NAME"), con->server_name->ptr, len),con)
        } else {
#ifdef HAVE_IPV6
                s = inet_ntop(srv_sock->addr.plain.sa_family,
                              srv_sock->addr.plain.sa_family == AF_INET6 ?
                              (const void *) &(srv_sock->addr.ipv6.sin6_addr) :
                              (const void *) &(srv_sock->addr.ipv4.sin_addr),
                              b2, sizeof(b2)-1);
#else
                s = inet_ntoa(srv_sock->addr.ipv4.sin_addr);
#endif
                FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("SERVER_NAME"), s, strlen(s)),con)
        }

        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("GATEWAY_INTERFACE"), CONST_STR_LEN("CGI/1.1")),con)

        li_utostrn(buf, sizeof(buf),
#ifdef HAVE_IPV6
               ntohs(srv_sock->addr.plain.sa_family ? srv_sock->addr.ipv6.sin6_port : srv_sock->addr.ipv4.sin_port)
#else
               ntohs(srv_sock->addr.ipv4.sin_port)
#endif
               );

        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("SERVER_PORT"), buf, strlen(buf)),con)

        /* get the server-side of the connection to the client */
        our_addr_len = sizeof(our_addr);

        if (-1 == getsockname(con->fd, (struct sockaddr *)&our_addr, &our_addr_len)
            || our_addr_len > (socklen_t)sizeof(our_addr)) {
                s = inet_ntop_cache_get_ip(srv, &(srv_sock->addr));
        } else {
                s = inet_ntop_cache_get_ip(srv, &(our_addr));
        }
        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("SERVER_ADDR"), s, strlen(s)),con)

        li_utostrn(buf, sizeof(buf),
#ifdef HAVE_IPV6
               ntohs(con->dst_addr.plain.sa_family ? con->dst_addr.ipv6.sin6_port : con->dst_addr.ipv4.sin_port)
#else
               ntohs(con->dst_addr.ipv4.sin_port)
#endif
               );

        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("REMOTE_PORT"), buf, strlen(buf)),con)

        s = inet_ntop_cache_get_ip(srv, &(con->dst_addr));
        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("REMOTE_ADDR"), s, strlen(s)),con)

        if (con->request.content_length > 0 && host->mode != FCGI_AUTHORIZER) {
                /* CGI-SPEC 6.1.2 and FastCGI spec 6.3 */

                li_itostrn(buf, sizeof(buf), con->request.content_length);
                FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("CONTENT_LENGTH"), buf, strlen(buf)),con)
        }

        if (host->mode != FCGI_AUTHORIZER) {
                /*
                 * SCRIPT_NAME, PATH_INFO and PATH_TRANSLATED according to
                 * http://cgi-spec.golux.com/draft-coar-cgi-v11-03-clean.html
                 * (6.1.14, 6.1.6, 6.1.7)
                 * For AUTHORIZER mode these headers should be omitted.
                 */

                FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("SCRIPT_NAME"), CONST_BUF_LEN(con->uri.path)),con)

                if (!buffer_string_is_empty(con->request.pathinfo)) {
                        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("PATH_INFO"), CONST_BUF_LEN(con->request.pathinfo)),con)

                        /* PATH_TRANSLATED is only defined if PATH_INFO is set */

                        if (!buffer_string_is_empty(host->docroot)) {
                                buffer_copy_buffer(p->path, host->docroot);
                        } else {
                                buffer_copy_buffer(p->path, con->physical.basedir);
                        }
                        buffer_append_string_buffer(p->path, con->request.pathinfo);
                        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("PATH_TRANSLATED"), CONST_BUF_LEN(p->path)),con)
                } else {
                        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("PATH_INFO"), CONST_STR_LEN("")),con)
                }
        }

        /*
         * SCRIPT_FILENAME and DOCUMENT_ROOT for php. The PHP manual
         * http://www.php.net/manual/en/reserved.variables.php
         * treatment of PATH_TRANSLATED is different from the one of CGI specs.
         * TODO: this code should be checked against cgi.fix_pathinfo php
         * parameter.
         */

        if (!buffer_string_is_empty(host->docroot)) {
                /*
                 * rewrite SCRIPT_FILENAME
                 *
                 */

                buffer_copy_buffer(p->path, host->docroot);
                buffer_append_string_buffer(p->path, con->uri.path);

                FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("SCRIPT_FILENAME"), CONST_BUF_LEN(p->path)),con)
                FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("DOCUMENT_ROOT"), CONST_BUF_LEN(host->docroot)),con)
        } else {
                buffer_copy_buffer(p->path, con->physical.path);

                /* cgi.fix_pathinfo need a broken SCRIPT_FILENAME to find out what PATH_INFO is itself
                 *
                 * see src/sapi/cgi_main.c, init_request_info()
                 */
                if (host->break_scriptfilename_for_php) {
                        buffer_append_string_buffer(p->path, con->request.pathinfo);
                }

                FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("SCRIPT_FILENAME"), CONST_BUF_LEN(p->path)),con)
                FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("DOCUMENT_ROOT"), CONST_BUF_LEN(con->physical.basedir)),con)
        }

        if (!buffer_string_is_empty(host->strip_request_uri)) {
                /* we need at least one char to strip off */
                /**
                 * /app1/index/list
                 *
                 * stripping /app1 or /app1/ should lead to
                 *
                 * /index/list
                 *
                 */

                if ('/' != host->strip_request_uri->ptr[buffer_string_length(host->strip_request_uri) - 1]) {
                        /* fix the user-input to have / as last char */
                        buffer_append_string_len(host->strip_request_uri, CONST_STR_LEN("/"));
                }

                if (buffer_string_length(req_uri) >= buffer_string_length(host->strip_request_uri) &&
                    0 == strncmp(req_uri->ptr, host->strip_request_uri->ptr, buffer_string_length(host->strip_request_uri))) {
                        /* the left is the same */

                        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("REQUEST_URI"),
                                        req_uri->ptr + (buffer_string_length(host->strip_request_uri) - 1),
                                        buffer_string_length(req_uri) - (buffer_string_length(host->strip_request_uri) - 1)), con)
                } else {
                        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("REQUEST_URI"), CONST_BUF_LEN(req_uri)),con)
                }
        } else {
                FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("REQUEST_URI"), CONST_BUF_LEN(req_uri)),con)
        }
        if (!buffer_is_equal(con->request.uri, con->request.orig_uri)) {
                FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("REDIRECT_URI"), CONST_BUF_LEN(con->request.uri)),con);
        }
        if (!buffer_string_is_empty(con->uri.query)) {
                FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("QUERY_STRING"), CONST_BUF_LEN(con->uri.query)),con)
        } else {
                FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("QUERY_STRING"), CONST_STR_LEN("")),con)
        }

        s = get_http_method_name(con->request.http_method);
        force_assert(s);
        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("REQUEST_METHOD"), s, strlen(s)),con)
        /* set REDIRECT_STATUS for php compiled with --force-redirect
         * (if REDIRECT_STATUS has not already been set by error handler) */
        if (0 == con->error_handler_saved_status) {
                FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("REDIRECT_STATUS"), CONST_STR_LEN("200")), con);
        }
        s = get_http_version_name(con->request.http_version);
        force_assert(s);
        FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("SERVER_PROTOCOL"), s, strlen(s)),con)

        if (buffer_is_equal_caseless_string(con->uri.scheme, CONST_STR_LEN("https"))) {
                FCGI_ENV_ADD_CHECK(fcgi_env_add(p->fcgi_env, CONST_STR_LEN("HTTPS"), CONST_STR_LEN("on")),con)
        }

        FCGI_ENV_ADD_CHECK(fcgi_env_add_request_headers(srv, con, p), con);

        {
                buffer *b = buffer_init();

                buffer_copy_string_len(b, (const char *)&beginRecord, sizeof(beginRecord));

                fcgi_header(&(header), FCGI_PARAMS, request_id, buffer_string_length(p->fcgi_env), 0);
                buffer_append_string_len(b, (const char *)&header, sizeof(header));
                buffer_append_string_buffer(b, p->fcgi_env);

                fcgi_header(&(header), FCGI_PARAMS, request_id, 0, 0);
                buffer_append_string_len(b, (const char *)&header, sizeof(header));

                hctx->wb_reqlen = buffer_string_length(b);
                chunkqueue_append_buffer(hctx->wb, b);
                buffer_free(b);
        }

        hctx->wb_reqlen += con->request.content_length;/* (eventual) (minimal) total request size, not necessarily including all fcgi_headers around content length yet */
        fcgi_stdin_append(srv, con, hctx, request_id);

        return 0;
}

static int fcgi_response_parse(server *srv, connection *con, plugin_data *p, buffer *in) {
        char *s, *ns;

        handler_ctx *hctx = con->plugin_ctx[p->id];
        fcgi_extension_host *host= hctx->host;
        int have_sendfile2 = 0;
        off_t sendfile2_content_length = 0;

        UNUSED(srv);

        /* search for \n */
        for (s = in->ptr; NULL != (ns = strchr(s, '\n')); s = ns + 1) {
                char *key, *value;
                int key_len;

                /* a good day. Someone has read the specs and is sending a \r\n to us */

                if (ns > in->ptr &&
                    *(ns-1) == '\r') {
                        *(ns-1) = '\0';
                }

                ns[0] = '\0';

                key = s;
                if (NULL == (value = strchr(s, ':'))) {
                        /* we expect: "<key>: <value>\n" */
                        continue;
                }

                key_len = value - key;

                value++;
                /* strip WS */
                while (*value == ' ' || *value == '\t') value++;

                if (host->mode != FCGI_AUTHORIZER ||
                    !(con->http_status == 0 ||
                      con->http_status == 200)) {
                        /* authorizers shouldn't affect the response headers sent back to the client */

                        /* don't forward Status: */
                        if (0 != strncasecmp(key, "Status", key_len)) {
                                data_string *ds;
                                if (NULL == (ds = (data_string *)array_get_unused_element(con->response.headers, TYPE_STRING))) {
                                        ds = data_response_init();
                                }
                                buffer_copy_string_len(ds->key, key, key_len);
                                buffer_copy_string(ds->value, value);

                                array_insert_unique(con->response.headers, (data_unset *)ds);
                        }
                }

                switch(key_len) {
                case 4:
                        if (0 == strncasecmp(key, "Date", key_len)) {
                                con->parsed_response |= HTTP_DATE;
                        }
                        break;
                case 6:
                        if (0 == strncasecmp(key, "Status", key_len)) {
                                int status = strtol(value, NULL, 10);
                                if (status >= 100 && status < 1000) {
                                        con->http_status = status;
                                        con->parsed_response |= HTTP_STATUS;
                                } else {
                                        con->http_status = 502;
                                }
                        }
                        break;
                case 8:
                        if (0 == strncasecmp(key, "Location", key_len)) {
                                con->parsed_response |= HTTP_LOCATION;
                        }
                        break;
                case 10:
                        if (0 == strncasecmp(key, "Connection", key_len)) {
                                con->response.keep_alive = (0 == strcasecmp(value, "Keep-Alive")) ? 1 : 0;
                                con->parsed_response |= HTTP_CONNECTION;
                        }
                        break;
                case 11:
                        if (host->xsendfile_allow && 0 == strncasecmp(key, "X-Sendfile2", key_len) && hctx->send_content_body) {
                                char *pos = value;
                                have_sendfile2 = 1;

                                while (*pos) {
                                        char *filename, *range;
                                        stat_cache_entry *sce;
                                        off_t begin_range, end_range, range_len;

                                        while (' ' == *pos) pos++;
                                        if (!*pos) break;

                                        filename = pos;
                                        if (NULL == (range = strchr(pos, ' '))) {
                                                /* missing range */
                                                if (p->conf.debug) {
                                                        log_error_write(srv, __FILE__, __LINE__, "ss", "Couldn't find range after filename:", filename);
                                                }
                                                return 502;
                                        }
                                        buffer_copy_string_len(srv->tmp_buf, filename, range - filename);

                                        /* find end of range */
                                        for (pos = ++range; *pos && *pos != ' ' && *pos != ','; pos++) ;

                                        buffer_urldecode_path(srv->tmp_buf);
                                        buffer_path_simplify(srv->tmp_buf, srv->tmp_buf);
                                        if (con->conf.force_lowercase_filenames) {
                                                buffer_to_lower(srv->tmp_buf);
                                        }
                                        if (host->xsendfile_docroot->used) {
                                                size_t i, xlen = buffer_string_length(srv->tmp_buf);
                                                for (i = 0; i < host->xsendfile_docroot->used; ++i) {
                                                        data_string *ds = (data_string *)host->xsendfile_docroot->data[i];
                                                        size_t dlen = buffer_string_length(ds->value);
                                                        if (dlen <= xlen
                                                            && (!con->conf.force_lowercase_filenames
                                                                ? 0 == memcmp(srv->tmp_buf->ptr, ds->value->ptr, dlen)
                                                                : 0 == strncasecmp(srv->tmp_buf->ptr, ds->value->ptr, dlen))) {
                                                                break;
                                                        }
                                                }
                                                if (i == host->xsendfile_docroot->used) {
                                                        log_error_write(srv, __FILE__, __LINE__, "SBs",
                                                                        "X-Sendfile2 (", srv->tmp_buf,
                                                                        ") not under configured x-sendfile-docroot(s)");
                                                        return 403;
                                                }
                                        }

                                        if (HANDLER_ERROR == stat_cache_get_entry(srv, con, srv->tmp_buf, &sce)) {
                                                if (p->conf.debug) {
                                                        log_error_write(srv, __FILE__, __LINE__, "sb",
                                                                "send-file error: couldn't get stat_cache entry for X-Sendfile2:",
                                                                srv->tmp_buf);
                                                }
                                                return 404;
                                        } else if (!S_ISREG(sce->st.st_mode)) {
                                                if (p->conf.debug) {
                                                        log_error_write(srv, __FILE__, __LINE__, "sb",
                                                                "send-file error: wrong filetype for X-Sendfile2:",
                                                                srv->tmp_buf);
                                                }
                                                return 502;
                                        }
                                        /* found the file */

                                        /* parse range */
                                        begin_range = 0; end_range = sce->st.st_size - 1;
                                        {
                                                char *rpos = NULL;
                                                errno = 0;
                                                begin_range = strtoll(range, &rpos, 10);
                                                if (errno != 0 || begin_range < 0 || rpos == range) goto range_failed;
                                                if ('-' != *rpos++) goto range_failed;
                                                if (rpos != pos) {
                                                        range = rpos;
                                                        end_range = strtoll(range, &rpos, 10);
                                                        if (errno != 0 || end_range < 0 || rpos == range) goto range_failed;
                                                }
                                                if (rpos != pos) goto range_failed;

                                                goto range_success;

range_failed:
                                                if (p->conf.debug) {
                                                        log_error_write(srv, __FILE__, __LINE__, "ss", "Couldn't decode range after filename:", filename);
                                                }
                                                return 502;

range_success: ;
                                        }

                                        /* no parameters accepted */

                                        while (*pos == ' ') pos++;
                                        if (*pos != '\0' && *pos != ',') return 502;

                                        range_len = end_range - begin_range + 1;
                                        if (range_len < 0) return 502;
                                        if (range_len != 0) {
                                                if (0 != http_chunk_append_file_range(srv, con, srv->tmp_buf, begin_range, range_len)) {
                                                        return 502;
                                                }
                                        }
                                        sendfile2_content_length += range_len;

                                        if (*pos == ',') pos++;
                                }
                        }
                        break;
                case 14:
                        if (0 == strncasecmp(key, "Content-Length", key_len)) {
                                con->response.content_length = strtoul(value, NULL, 10);
                                con->parsed_response |= HTTP_CONTENT_LENGTH;

                                if (con->response.content_length < 0) con->response.content_length = 0;
                        }
                        break;
                default:
                        break;
                }
        }

        if (have_sendfile2) {
                data_string *dcls;

                /* fix content-length */
                if (NULL == (dcls = (data_string *)array_get_unused_element(con->response.headers, TYPE_STRING))) {
                        dcls = data_response_init();
                }

                buffer_copy_string_len(dcls->key, "Content-Length", sizeof("Content-Length")-1);
                buffer_copy_int(dcls->value, sendfile2_content_length);
                array_replace(con->response.headers, (data_unset *)dcls);

                con->parsed_response |= HTTP_CONTENT_LENGTH;
                con->response.content_length = sendfile2_content_length;
                return 200;
        }

        /* CGI/1.1 rev 03 - 7.2.1.2 */
        if ((con->parsed_response & HTTP_LOCATION) &&
            !(con->parsed_response & HTTP_STATUS)) {
                con->http_status = 302;
        }

        return 0;
}

typedef struct {
        buffer  *b;
        unsigned int len;
        int      type;
        int      padding;
        int      request_id;
} fastcgi_response_packet;

static int fastcgi_get_packet(server *srv, handler_ctx *hctx, fastcgi_response_packet *packet) {
        chunk *c;
        size_t offset;
        size_t toread;
        FCGI_Header *header;

        if (!hctx->rb->first) return -1;

        packet->b = buffer_init();
        packet->len = 0;
        packet->type = 0;
        packet->padding = 0;
        packet->request_id = 0;

        offset = 0; toread = 8;
        /* get at least the FastCGI header */
        for (c = hctx->rb->first; c; c = c->next) {
                size_t weHave = buffer_string_length(c->mem) - c->offset;

                if (weHave > toread) weHave = toread;

                buffer_append_string_len(packet->b, c->mem->ptr + c->offset, weHave);
                toread -= weHave;
                offset = weHave; /* skip offset bytes in chunk for "real" data */

                if (0 == toread) break;
        }

        if (buffer_string_length(packet->b) < sizeof(FCGI_Header)) {
                /* no header */
                if (hctx->plugin_data->conf.debug) {
                        log_error_write(srv, __FILE__, __LINE__, "sdsds", "FastCGI: header too small:", buffer_string_length(packet->b), "bytes <", sizeof(FCGI_Header), "bytes, waiting for more data");
                }

                buffer_free(packet->b);

                return -1;
        }

        /* we have at least a header, now check how much me have to fetch */
        header = (FCGI_Header *)(packet->b->ptr);

        packet->len = (header->contentLengthB0 | (header->contentLengthB1 << 8)) + header->paddingLength;
        packet->request_id = (header->requestIdB0 | (header->requestIdB1 << 8));
        packet->type = header->type;
        packet->padding = header->paddingLength;

        /* ->b should only be the content */
        buffer_string_set_length(packet->b, 0);

        if (packet->len) {
                /* copy the content */
                for (; c && (buffer_string_length(packet->b) < packet->len); c = c->next) {
                        size_t weWant = packet->len - buffer_string_length(packet->b);
                        size_t weHave = buffer_string_length(c->mem) - c->offset - offset;

                        if (weHave > weWant) weHave = weWant;

                        buffer_append_string_len(packet->b, c->mem->ptr + c->offset + offset, weHave);

                        /* we only skipped the first bytes as they belonged to the fcgi header */
                        offset = 0;
                }

                if (buffer_string_length(packet->b) < packet->len) {
                        /* we didn't get the full packet */

                        buffer_free(packet->b);
                        return -1;
                }

                buffer_string_set_length(packet->b, buffer_string_length(packet->b) - packet->padding);
        }

        chunkqueue_mark_written(hctx->rb, packet->len + sizeof(FCGI_Header));

        return 0;
}

static int fcgi_demux_response(server *srv, handler_ctx *hctx) {
        int fin = 0;
        int toread, ret;
        ssize_t r = 0;

        plugin_data *p    = hctx->plugin_data;
        connection *con   = hctx->remote_conn;
        int fcgi_fd       = hctx->fd;
        fcgi_extension_host *host= hctx->host;
        fcgi_proc *proc   = hctx->proc;

        /*
         * check how much we have to read
         */
      #if !defined(_WIN32) && !defined(__CYGWIN__)
        if (ioctl(hctx->fd, FIONREAD, &toread)) {
                if (errno == EAGAIN) {
                        fdevent_event_add(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_IN);
                        return 0;
                }
                log_error_write(srv, __FILE__, __LINE__, "sd",
                                "unexpected end-of-file (perhaps the fastcgi process died):",
                                fcgi_fd);
                return -1;
        }
      #else
        toread = 4096;
      #endif

        if (toread > 0) {
                char *mem;
                size_t mem_len;

                if ((con->conf.stream_response_body & FDEVENT_STREAM_RESPONSE_BUFMIN)) {
                        off_t cqlen = chunkqueue_length(hctx->rb);
                        if (cqlen + toread > 65536 + (int)sizeof(FCGI_Header)) { /*(max size of FastCGI packet + 1)*/
                                if (cqlen < 65536 + (int)sizeof(FCGI_Header)) {
                                        toread = 65536 + (int)sizeof(FCGI_Header) - cqlen;
                                } else { /* should not happen */
                                        toread = toread < 1024 ? toread : 1024;
                                }
                        }
                }

                chunkqueue_get_memory(hctx->rb, &mem, &mem_len, 0, toread);
                r = read(hctx->fd, mem, mem_len);
                chunkqueue_use_memory(hctx->rb, r > 0 ? r : 0);

                if (-1 == r) {
                        if (errno == EAGAIN) {
                                fdevent_event_add(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_IN);
                                return 0;
                        }
                        log_error_write(srv, __FILE__, __LINE__, "sds",
                                        "unexpected end-of-file (perhaps the fastcgi process died):",
                                        fcgi_fd, strerror(errno));
                        return -1;
                }
        }
        if (0 == r) {
                log_error_write(srv, __FILE__, __LINE__, "ssdsb",
                                "unexpected end-of-file (perhaps the fastcgi process died):",
                                "pid:", proc->pid,
                                "socket:", proc->connection_name);

                return -1;
        }

        /*
         * parse the fastcgi packets and forward the content to the write-queue
         *
         */
        while (fin == 0) {
                fastcgi_response_packet packet;

                /* check if we have at least one packet */
                if (0 != fastcgi_get_packet(srv, hctx, &packet)) {
                        /* no full packet */
                        break;
                }

                switch(packet.type) {
                case FCGI_STDOUT:
                        if (packet.len == 0) break;

                        /* is the header already finished */
                        if (0 == con->file_started) {
                                char *c;
                                data_string *ds;

                                /* search for header terminator
                                 *
                                 * if we start with \r\n check if last packet terminated with \r\n
                                 * if we start with \n check if last packet terminated with \n
                                 * search for \r\n\r\n
                                 * search for \n\n
                                 */

                                buffer_append_string_buffer(hctx->response_header, packet.b);

                                if (NULL != (c = buffer_search_string_len(hctx->response_header, CONST_STR_LEN("\r\n\r\n")))) {
                                        char *hend = c + 4; /* header end == body start */
                                        size_t hlen = hend - hctx->response_header->ptr;
                                        buffer_copy_string_len(packet.b, hend, buffer_string_length(hctx->response_header) - hlen);
                                        buffer_string_set_length(hctx->response_header, hlen);
                                } else if (NULL != (c = buffer_search_string_len(hctx->response_header, CONST_STR_LEN("\n\n")))) {
                                        char *hend = c + 2; /* header end == body start */
                                        size_t hlen = hend - hctx->response_header->ptr;
                                        buffer_copy_string_len(packet.b, hend, buffer_string_length(hctx->response_header) - hlen);
                                        buffer_string_set_length(hctx->response_header, hlen);
                                } else {
                                        /* no luck, no header found */
                                        /*(reuse MAX_HTTP_REQUEST_HEADER as max size for response headers from backends)*/
                                        if (buffer_string_length(hctx->response_header) > MAX_HTTP_REQUEST_HEADER) {
                                                log_error_write(srv, __FILE__, __LINE__, "sb", "response headers too large for", con->uri.path);
                                                con->http_status = 502; /* Bad Gateway */
                                                con->mode = DIRECT;
                                                fin = 1;
                                        }
                                        break;
                                }

                                /* parse the response header */
                                if ((ret = fcgi_response_parse(srv, con, p, hctx->response_header))) {
                                        if (200 != ret) { /*(200 returned for X-Sendfile2 handled)*/
                                                con->http_status = ret;
                                                con->mode = DIRECT;
                                        }
                                        con->file_started = 1;
                                        hctx->send_content_body = 0;
                                        fin = 1;
                                        break;
                                }

                                con->file_started = 1;

                                if (host->mode == FCGI_AUTHORIZER &&
                                    (con->http_status == 0 ||
                                     con->http_status == 200)) {
                                        /* a authorizer with approved the static request, ignore the content here */
                                        hctx->send_content_body = 0;
                                }

                                if (host->xsendfile_allow && hctx->send_content_body &&
                                    (NULL != (ds = (data_string *) array_get_element(con->response.headers, "X-LIGHTTPD-send-file"))
                                          || NULL != (ds = (data_string *) array_get_element(con->response.headers, "X-Sendfile")))) {
                                        http_response_xsendfile(srv, con, ds->value, host->xsendfile_docroot);
                                        if (con->mode == DIRECT) {
                                                fin = 1;
                                        }

                                        hctx->send_content_body = 0; /* ignore the content */
                                        break;
                                }
                        }

                        if (hctx->send_content_body && !buffer_string_is_empty(packet.b)) {
                                if (0 != http_chunk_append_buffer(srv, con, packet.b)) {
                                        /* error writing to tempfile;
                                         * truncate response or send 500 if nothing sent yet */
                                        fin = 1;
                                        break;
                                }
                                if ((con->conf.stream_response_body & FDEVENT_STREAM_RESPONSE_BUFMIN)
                                    && chunkqueue_length(con->write_queue) > 65536 - 4096) {
                                        if (!con->is_writable) {
                                                /*(defer removal of FDEVENT_IN interest since
                                                 * connection_state_machine() might be able to send data
                                                 * immediately, unless !con->is_writable, where
                                                 * connection_state_machine() might not loop back to call
                                                 * mod_fastcgi_handle_subrequest())*/
                                                fdevent_event_clr(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_IN);
                                        }
                                }
                        }
                        break;
                case FCGI_STDERR:
                        if (packet.len == 0) break;

                        log_error_write_multiline_buffer(srv, __FILE__, __LINE__, packet.b, "s",
                                        "FastCGI-stderr:");

                        break;
                case FCGI_END_REQUEST:
                        fin = 1;
                        break;
                default:
                        log_error_write(srv, __FILE__, __LINE__, "sd",
                                        "FastCGI: header.type not handled: ", packet.type);
                        break;
                }
                buffer_free(packet.b);
        }

        return fin;
}

static int fcgi_restart_dead_procs(server *srv, plugin_data *p, fcgi_extension_host *host) {
        fcgi_proc *proc;

        for (proc = host->first; proc; proc = proc->next) {
                int status;

                if (p->conf.debug > 2) {
                        log_error_write(srv, __FILE__, __LINE__,  "sbdddd",
                                        "proc:",
                                        proc->connection_name,
                                        proc->state,
                                        proc->is_local,
                                        proc->load,
                                        proc->pid);
                }

                /*
                 * if the remote side is overloaded, we check back after <n> seconds
                 *
                 */
                switch (proc->state) {
                case PROC_STATE_KILLED:
                case PROC_STATE_UNSET:
                        /* this should never happen as long as adaptive spawing is disabled */
                        force_assert(0);

                        break;
                case PROC_STATE_RUNNING:
                        break;
                case PROC_STATE_OVERLOADED:
                        if (srv->cur_ts <= proc->disabled_until) break;

                        proc->state = PROC_STATE_RUNNING;
                        host->active_procs++;

                        log_error_write(srv, __FILE__, __LINE__,  "sbdb",
                                        "fcgi-server re-enabled:",
                                        host->host, host->port,
                                        host->unixsocket);
                        break;
                case PROC_STATE_DIED_WAIT_FOR_PID:
                        /* non-local procs don't have PIDs to wait for */
                        if (!proc->is_local) {
                                proc->state = PROC_STATE_DIED;
                        } else {
                                /* the child should not terminate at all */

                                for ( ;; ) {
                                        switch(waitpid(proc->pid, &status, WNOHANG)) {
                                        case 0:
                                                /* child is still alive */
                                                if (srv->cur_ts <= proc->disabled_until) break;

                                                proc->state = PROC_STATE_RUNNING;
                                                host->active_procs++;

                                                log_error_write(srv, __FILE__, __LINE__,  "sbdb",
                                                        "fcgi-server re-enabled:",
                                                        host->host, host->port,
                                                        host->unixsocket);
                                                break;
                                        case -1:
                                                if (errno == EINTR) continue;

                                                log_error_write(srv, __FILE__, __LINE__, "sd",
                                                        "child died somehow, waitpid failed:",
                                                        errno);
                                                proc->state = PROC_STATE_DIED;
                                                break;
                                        default:
                                                if (WIFEXITED(status)) {
#if 0
                                                        log_error_write(srv, __FILE__, __LINE__, "sdsd",
                                                                "child exited, pid:", proc->pid,
                                                                "status:", WEXITSTATUS(status));
#endif
                                                } else if (WIFSIGNALED(status)) {
                                                        log_error_write(srv, __FILE__, __LINE__, "sd",
                                                                "child signaled:",
                                                                WTERMSIG(status));
                                                } else {
                                                        log_error_write(srv, __FILE__, __LINE__, "sd",
                                                                "child died somehow:",
                                                                status);
                                                }

                                                proc->state = PROC_STATE_DIED;
                                                break;
                                        }
                                        break;
                                }
                        }

                        /* fall through if we have a dead proc now */
                        if (proc->state != PROC_STATE_DIED) break;

                case PROC_STATE_DIED:
                        /* local procs get restarted by us,
                         * remote ones hopefully by the admin */

                        if (!buffer_string_is_empty(host->bin_path)) {
                                /* we still have connections bound to this proc,
                                 * let them terminate first */
                                if (proc->load != 0) break;

                                /* restart the child */

                                if (p->conf.debug) {
                                        log_error_write(srv, __FILE__, __LINE__, "ssbsdsd",
                                                        "--- fastcgi spawning",
                                                        "\n\tsocket", proc->connection_name,
                                                        "\n\tcurrent:", 1, "/", host->max_procs);
                                }

                                if (fcgi_spawn_connection(srv, p, host, proc)) {
                                        log_error_write(srv, __FILE__, __LINE__, "s",
                                                        "ERROR: spawning fcgi failed.");
                                        return HANDLER_ERROR;
                                }
                        } else {
                                if (srv->cur_ts <= proc->disabled_until) break;

                                proc->state = PROC_STATE_RUNNING;
                                host->active_procs++;

                                log_error_write(srv, __FILE__, __LINE__,  "sb",
                                                "fcgi-server re-enabled:",
                                                proc->connection_name);
                        }
                        break;
                }
        }

        return 0;
}

static handler_t fcgi_write_request(server *srv, handler_ctx *hctx) {
        plugin_data *p    = hctx->plugin_data;
        fcgi_extension_host *host= hctx->host;
        connection *con   = hctx->remote_conn;
        fcgi_proc  *proc;

        int ret;

        /* sanity check:
         *  - host != NULL
         *  - either:
         *     - tcp socket (do not check host->host->uses, as it may be not set which means INADDR_LOOPBACK)
         *     - unix socket
         */
        if (!host) {
                log_error_write(srv, __FILE__, __LINE__, "s", "fatal error: host = NULL");
                return HANDLER_ERROR;
        }
        if ((!host->port && buffer_string_is_empty(host->unixsocket))) {
                log_error_write(srv, __FILE__, __LINE__, "s", "fatal error: neither host->port nor host->unixsocket is set");
                return HANDLER_ERROR;
        }

        /* we can't handle this in the switch as we have to fall through in it */
        if (hctx->state == FCGI_STATE_CONNECT_DELAYED) {
                int socket_error;
                socklen_t socket_error_len = sizeof(socket_error);

                /* try to finish the connect() */
                if (0 != getsockopt(hctx->fd, SOL_SOCKET, SO_ERROR, &socket_error, &socket_error_len)) {
                        log_error_write(srv, __FILE__, __LINE__, "ss",
                                        "getsockopt failed:", strerror(errno));

                        fcgi_host_disable(srv, hctx);

                        return HANDLER_ERROR;
                }
                if (socket_error != 0) {
                        if (!hctx->proc->is_local || p->conf.debug) {
                                /* local procs get restarted */

                                log_error_write(srv, __FILE__, __LINE__, "sssb",
                                                "establishing connection failed:", strerror(socket_error),
                                                "socket:", hctx->proc->connection_name);
                        }

                        fcgi_host_disable(srv, hctx);
                        log_error_write(srv, __FILE__, __LINE__, "sdssdsd",
                                "backend is overloaded; we'll disable it for", hctx->host->disable_time, "seconds and send the request to another backend instead:",
                                "reconnects:", hctx->reconnects,
                                "load:", host->load);

                        fastcgi_status_copy_procname(p->statuskey, hctx->host, hctx->proc);
                        buffer_append_string_len(p->statuskey, CONST_STR_LEN(".died"));

                        status_counter_inc(srv, CONST_BUF_LEN(p->statuskey));

                        return HANDLER_ERROR;
                }
                /* go on with preparing the request */
                hctx->state = FCGI_STATE_PREPARE_WRITE;
        }


        switch(hctx->state) {
        case FCGI_STATE_CONNECT_DELAYED:
                /* should never happen */
                return HANDLER_WAIT_FOR_EVENT;
        case FCGI_STATE_INIT:
                /* do we have a running process for this host (max-procs) ? */
                hctx->proc = NULL;

                for (proc = hctx->host->first;
                     proc && proc->state != PROC_STATE_RUNNING;
                     proc = proc->next);

                /* all children are dead */
                if (proc == NULL) {
                        hctx->fde_ndx = -1;

                        return HANDLER_ERROR;
                }

                hctx->proc = proc;

                /* check the other procs if they have a lower load */
                for (proc = proc->next; proc; proc = proc->next) {
                        if (proc->state != PROC_STATE_RUNNING) continue;
                        if (proc->load < hctx->proc->load) hctx->proc = proc;
                }

                if (-1 == (hctx->fd = socket(host->family, SOCK_STREAM, 0))) {
                        if (errno == EMFILE ||
                            errno == EINTR) {
                                log_error_write(srv, __FILE__, __LINE__, "sd",
                                                "wait for fd at connection:", con->fd);

                                return HANDLER_WAIT_FOR_FD;
                        }

                        log_error_write(srv, __FILE__, __LINE__, "ssdd",
                                        "socket failed:", strerror(errno), srv->cur_fds, srv->max_fds);
                        return HANDLER_ERROR;
                }
                hctx->fde_ndx = -1;

                srv->cur_fds++;

                fdevent_register(srv->ev, hctx->fd, fcgi_handle_fdevent, hctx);

                if (-1 == fdevent_fcntl_set(srv->ev, hctx->fd)) {
                        log_error_write(srv, __FILE__, __LINE__, "ss",
                                        "fcntl failed:", strerror(errno));

                        return HANDLER_ERROR;
                }

                if (hctx->proc->is_local) {
                        hctx->pid = hctx->proc->pid;
                }

                switch (fcgi_establish_connection(srv, hctx)) {
                case CONNECTION_DELAYED:
                        /* connection is in progress, wait for an event and call getsockopt() below */

                        fdevent_event_set(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_OUT);

                        fcgi_set_state(srv, hctx, FCGI_STATE_CONNECT_DELAYED);
                        return HANDLER_WAIT_FOR_EVENT;
                case CONNECTION_OVERLOADED:
                        /* cool down the backend, it is overloaded
                         * -> EAGAIN */

                        if (hctx->host->disable_time) {
                                log_error_write(srv, __FILE__, __LINE__, "sdssdsd",
                                        "backend is overloaded; we'll disable it for", hctx->host->disable_time, "seconds and send the request to another backend instead:",
                                        "reconnects:", hctx->reconnects,
                                        "load:", host->load);

                                hctx->proc->disabled_until = srv->cur_ts + hctx->host->disable_time;
                                if (hctx->proc->state == PROC_STATE_RUNNING) hctx->host->active_procs--;
                                hctx->proc->state = PROC_STATE_OVERLOADED;
                        }

                        fastcgi_status_copy_procname(p->statuskey, hctx->host, hctx->proc);
                        buffer_append_string_len(p->statuskey, CONST_STR_LEN(".overloaded"));

                        status_counter_inc(srv, CONST_BUF_LEN(p->statuskey));

                        return HANDLER_ERROR;
                case CONNECTION_DEAD:
                        /* we got a hard error from the backend like
                         * - ECONNREFUSED for tcp-ip sockets
                         * - ENOENT for unix-domain-sockets
                         *
                         * for check if the host is back in hctx->host->disable_time seconds
                         *  */

                        fcgi_host_disable(srv, hctx);

                        log_error_write(srv, __FILE__, __LINE__, "sdssdsd",
                                "backend died; we'll disable it for", hctx->host->disable_time, "seconds and send the request to another backend instead:",
                                "reconnects:", hctx->reconnects,
                                "load:", host->load);

                        fastcgi_status_copy_procname(p->statuskey, hctx->host, hctx->proc);
                        buffer_append_string_len(p->statuskey, CONST_STR_LEN(".died"));

                        status_counter_inc(srv, CONST_BUF_LEN(p->statuskey));

                        return HANDLER_ERROR;
                case CONNECTION_OK:
                        /* everything is ok, go on */

                        fcgi_set_state(srv, hctx, FCGI_STATE_PREPARE_WRITE);

                        break;
                }
                /* fallthrough */
        case FCGI_STATE_PREPARE_WRITE:
                /* ok, we have the connection */

                fcgi_proc_load_inc(srv, hctx);
                hctx->got_proc = 1;

                status_counter_inc(srv, CONST_STR_LEN("fastcgi.requests"));

                fastcgi_status_copy_procname(p->statuskey, hctx->host, hctx->proc);
                buffer_append_string_len(p->statuskey, CONST_STR_LEN(".connected"));

                status_counter_inc(srv, CONST_BUF_LEN(p->statuskey));

                if (p->conf.debug) {
                        log_error_write(srv, __FILE__, __LINE__, "ssdsbsd",
                                "got proc:",
                                "pid:", hctx->proc->pid,
                                "socket:", hctx->proc->connection_name,
                                "load:", hctx->proc->load);
                }

                /* move the proc-list entry down the list */
                if (hctx->request_id == 0) {
                        hctx->request_id = 1; /* always use id 1 as we don't use multiplexing */
                } else {
                        log_error_write(srv, __FILE__, __LINE__, "sd",
                                        "fcgi-request is already in use:", hctx->request_id);
                }

                if (-1 == fcgi_create_env(srv, hctx, hctx->request_id)) return HANDLER_ERROR;

                fdevent_event_add(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_IN);
                fcgi_set_state(srv, hctx, FCGI_STATE_WRITE);
                /* fall through */
        case FCGI_STATE_WRITE:
                ret = srv->network_backend_write(srv, con, hctx->fd, hctx->wb, MAX_WRITE_LIMIT);

                chunkqueue_remove_finished_chunks(hctx->wb);

                if (ret < 0) {
                        switch(errno) {
                        case EPIPE:
                        case ENOTCONN:
                        case ECONNRESET:
                                /* the connection got dropped after accept()
                                 * we don't care about that - if you accept() it, you have to handle it.
                                 */

                                log_error_write(srv, __FILE__, __LINE__, "ssosb",
                                                        "connection was dropped after accept() (perhaps the fastcgi process died),",
                                                "write-offset:", hctx->wb->bytes_out,
                                                "socket:", hctx->proc->connection_name);

                                return HANDLER_ERROR;
                        default:
                                log_error_write(srv, __FILE__, __LINE__, "ssd",
                                                "write failed:", strerror(errno), errno);

                                return HANDLER_ERROR;
                        }
                }

                if (hctx->wb->bytes_out == hctx->wb_reqlen) {
                        fdevent_event_clr(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_OUT);
                        fcgi_set_state(srv, hctx, FCGI_STATE_READ);
                } else {
                        off_t wblen = hctx->wb->bytes_in - hctx->wb->bytes_out;
                        if (hctx->wb->bytes_in < hctx->wb_reqlen && wblen < 65536 - 16384) {
                                /*(con->conf.stream_request_body & FDEVENT_STREAM_REQUEST)*/
                                if (!(con->conf.stream_request_body & FDEVENT_STREAM_REQUEST_POLLIN)) {
                                        con->conf.stream_request_body |= FDEVENT_STREAM_REQUEST_POLLIN;
                                        con->is_readable = 1; /* trigger optimistic read from client */
                                }
                        }
                        if (0 == wblen) {
                                fdevent_event_clr(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_OUT);
                        } else {
                                fdevent_event_add(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_OUT);
                        }
                }

                return HANDLER_WAIT_FOR_EVENT;
        case FCGI_STATE_READ:
                /* waiting for a response */
                return HANDLER_WAIT_FOR_EVENT;
        default:
                log_error_write(srv, __FILE__, __LINE__, "s", "(debug) unknown state");
                return HANDLER_ERROR;
        }
}


/* might be called on fdevent after a connect() is delay too
 * */
static handler_t fcgi_send_request(server *srv, handler_ctx *hctx) {
        fcgi_extension_host *host;
        handler_t rc;

        /* we don't have a host yet, choose one
         * -> this happens in the first round
         *    and when the host died and we have to select a new one */
        if (hctx->host == NULL) {
                size_t k;
                int ndx, used = -1;

                /* check if the next server has no load. */
                ndx = hctx->ext->last_used_ndx + 1;
                if(ndx >= (int) hctx->ext->used || ndx < 0) ndx = 0;
                host = hctx->ext->hosts[ndx];
                if (host->load > 0) {
                        /* get backend with the least load. */
                        for (k = 0, ndx = -1; k < hctx->ext->used; k++) {
                                host = hctx->ext->hosts[k];

                                /* we should have at least one proc that can do something */
                                if (host->active_procs == 0) continue;

                                if (used == -1 || host->load < used) {
                                        used = host->load;

                                        ndx = k;
                                }
                        }
                }

                /* found a server */
                if (ndx == -1) {
                        /* all hosts are down */

                        fcgi_connection_close(srv, hctx);

                        return HANDLER_FINISHED;
                }

                hctx->ext->last_used_ndx = ndx;
                host = hctx->ext->hosts[ndx];

                /*
                 * if check-local is disabled, use the uri.path handler
                 *
                 */

                /* init handler-context */

                /* we put a connection on this host, move the other new connections to other hosts
                 *
                 * as soon as hctx->host is unassigned, decrease the load again */
                fcgi_host_assign(srv, hctx, host);
                hctx->proc = NULL;
        } else {
                host = hctx->host;
        }

        /* ok, create the request */
        rc = fcgi_write_request(srv, hctx);
        if (HANDLER_ERROR != rc) {
                return rc;
        } else {
                plugin_data *p  = hctx->plugin_data;
                connection *con = hctx->remote_conn;

                if (hctx->state == FCGI_STATE_INIT ||
                    hctx->state == FCGI_STATE_CONNECT_DELAYED) {
                        fcgi_restart_dead_procs(srv, p, host);

                        /* cleanup this request and let the request handler start this request again */
                        if (hctx->reconnects < 5) {
                                fcgi_reconnect(srv, hctx);

                                return HANDLER_COMEBACK;
                        } else {
                                fcgi_connection_close(srv, hctx);
                                con->http_status = 503;

                                return HANDLER_FINISHED;
                        }
                } else {
                        int status = con->http_status;
                        fcgi_connection_close(srv, hctx);
                        con->http_status = (status == 400) ? 400 : 503; /* see FCGI_ENV_ADD_CHECK() for 400 error */

                        return HANDLER_FINISHED;
                }
        }
}


static handler_t fcgi_recv_response(server *srv, handler_ctx *hctx);


SUBREQUEST_FUNC(mod_fastcgi_handle_subrequest) {
        plugin_data *p = p_d;

        handler_ctx *hctx = con->plugin_ctx[p->id];

        if (NULL == hctx) return HANDLER_GO_ON;

        /* not my job */
        if (con->mode != p->id) return HANDLER_GO_ON;

        if ((con->conf.stream_response_body & FDEVENT_STREAM_RESPONSE_BUFMIN)
            && con->file_started) {
                if (chunkqueue_length(con->write_queue) > 65536 - 4096) {
                        fdevent_event_clr(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_IN);
                } else if (!(fdevent_event_get_interest(srv->ev, hctx->fd) & FDEVENT_IN)) {
                        /* optimistic read from backend, which might re-enable FDEVENT_IN */
                        handler_t rc = fcgi_recv_response(srv, hctx); /*(might invalidate hctx)*/
                        if (rc != HANDLER_GO_ON) return rc;           /*(unless HANDLER_GO_ON)*/
                }
        }

        if (0 == hctx->wb->bytes_in
            ? con->state == CON_STATE_READ_POST
            : hctx->wb->bytes_in < hctx->wb_reqlen) {
                /*(64k - 4k to attempt to avoid temporary files
                 * in conjunction with FDEVENT_STREAM_REQUEST_BUFMIN)*/
                if (hctx->wb->bytes_in - hctx->wb->bytes_out > 65536 - 4096
                    && (con->conf.stream_request_body & FDEVENT_STREAM_REQUEST_BUFMIN)){
                        con->conf.stream_request_body &= ~FDEVENT_STREAM_REQUEST_POLLIN;
                        if (0 != hctx->wb->bytes_in) return HANDLER_WAIT_FOR_EVENT;
                } else {
                        handler_t r = connection_handle_read_post_state(srv, con);
                        chunkqueue *req_cq = con->request_content_queue;
                        if (0 != hctx->wb->bytes_in && !chunkqueue_is_empty(req_cq)) {
                                fcgi_stdin_append(srv, con, hctx, hctx->request_id);
                                if (fdevent_event_get_interest(srv->ev, hctx->fd) & FDEVENT_OUT) {
                                        return (r == HANDLER_GO_ON) ? HANDLER_WAIT_FOR_EVENT : r;
                                }
                        }
                        if (r != HANDLER_GO_ON) return r;
                }
        }

        return (0 == hctx->wb->bytes_in || !chunkqueue_is_empty(hctx->wb))
          ? fcgi_send_request(srv, hctx)
          : HANDLER_WAIT_FOR_EVENT;
}


static handler_t fcgi_recv_response(server *srv, handler_ctx *hctx) {
        connection  *con  = hctx->remote_conn;
        plugin_data *p    = hctx->plugin_data;

        fcgi_proc *proc   = hctx->proc;
        fcgi_extension_host *host= hctx->host;

                switch (fcgi_demux_response(srv, hctx)) {
                case 0:
                        break;
                case 1:

                        if (host->mode == FCGI_AUTHORIZER &&
                            (con->http_status == 200 ||
                             con->http_status == 0)) {
                                /*
                                 * If we are here in AUTHORIZER mode then a request for authorizer
                                 * was processed already, and status 200 has been returned. We need
                                 * now to handle authorized request.
                                 */

                                buffer_copy_buffer(con->physical.doc_root, host->docroot);
                                buffer_copy_buffer(con->physical.basedir, host->docroot);

                                buffer_copy_buffer(con->physical.path, host->docroot);
                                buffer_append_string_buffer(con->physical.path, con->uri.path);

                                con->mode = DIRECT;/*(avoid changing con->state, con->http_status)*/
                                fcgi_connection_close(srv, hctx);
                                con->http_status = 0;
                                con->file_started = 1; /* fcgi_extension won't touch the request afterwards */
                        } else {
                                /* we are done */
                                fcgi_connection_close(srv, hctx);
                        }

                        return HANDLER_FINISHED;
                case -1:
                        if (proc->pid && proc->state != PROC_STATE_DIED) {
                                int status;

                                /* only fetch the zombie if it is not already done */

                                switch(waitpid(proc->pid, &status, WNOHANG)) {
                                case 0:
                                        /* child is still alive */
                                        break;
                                case -1:
                                        break;
                                default:
                                        /* the child should not terminate at all */
                                        if (WIFEXITED(status)) {
                                                log_error_write(srv, __FILE__, __LINE__, "sdsd",
                                                                "child exited, pid:", proc->pid,
                                                                "status:", WEXITSTATUS(status));
                                        } else if (WIFSIGNALED(status)) {
                                                log_error_write(srv, __FILE__, __LINE__, "sd",
                                                                "child signaled:",
                                                                WTERMSIG(status));
                                        } else {
                                                log_error_write(srv, __FILE__, __LINE__, "sd",
                                                                "child died somehow:",
                                                                status);
                                        }

                                        if (p->conf.debug) {
                                                log_error_write(srv, __FILE__, __LINE__, "ssbsdsd",
                                                                "--- fastcgi spawning",
                                                                "\n\tsocket", proc->connection_name,
                                                                "\n\tcurrent:", 1, "/", host->max_procs);
                                        }

                                        if (fcgi_spawn_connection(srv, p, host, proc)) {
                                                /* respawning failed, retry later */
                                                proc->state = PROC_STATE_DIED;

                                                log_error_write(srv, __FILE__, __LINE__, "s",
                                                                "respawning failed, will retry later");
                                        }

                                        break;
                                }
                        }

                        if (con->file_started == 0) {
                                /* nothing has been sent out yet, try to use another child */

                                if (hctx->wb->bytes_out == 0 &&
                                    hctx->reconnects < 5) {

                                        log_error_write(srv, __FILE__, __LINE__, "ssbsBSBs",
                                                "response not received, request not sent",
                                                "on socket:", proc->connection_name,
                                                "for", con->uri.path, "?", con->uri.query, ", reconnecting");

                                        fcgi_reconnect(srv, hctx);

                                        return HANDLER_COMEBACK;
                                }

                                log_error_write(srv, __FILE__, __LINE__, "sosbsBSBs",
                                                "response not received, request sent:", hctx->wb->bytes_out,
                                                "on socket:", proc->connection_name,
                                                "for", con->uri.path, "?", con->uri.query, ", closing connection");
                        } else {
                                log_error_write(srv, __FILE__, __LINE__, "ssbsBSBs",
                                                "response already sent out, but backend returned error",
                                                "on socket:", proc->connection_name,
                                                "for", con->uri.path, "?", con->uri.query, ", terminating connection");
                        }

                        http_response_backend_error(srv, con);
                        fcgi_connection_close(srv, hctx);
                        return HANDLER_FINISHED;
                }

                return HANDLER_GO_ON;
}


static handler_t fcgi_handle_fdevent(server *srv, void *ctx, int revents) {
        handler_ctx *hctx = ctx;
        connection  *con  = hctx->remote_conn;

        joblist_append(srv, con);

        if (revents & FDEVENT_IN) {
                handler_t rc = fcgi_recv_response(srv, hctx);/*(might invalidate hctx)*/
                if (rc != HANDLER_GO_ON) return rc;          /*(unless HANDLER_GO_ON)*/
        }

        if (revents & FDEVENT_OUT) {
                return fcgi_send_request(srv, hctx); /*(might invalidate hctx)*/
        }

        /* perhaps this issue is already handled */
        if (revents & FDEVENT_HUP) {
                if (hctx->state == FCGI_STATE_CONNECT_DELAYED) {
                        /* getoptsock will catch this one (right ?)
                         *
                         * if we are in connect we might get an EINPROGRESS
                         * in the first call and an FDEVENT_HUP in the
                         * second round
                         *
                         * FIXME: as it is a bit ugly.
                         *
                         */
                        fcgi_send_request(srv, hctx);
                } else if (con->file_started) {
                        /* drain any remaining data from kernel pipe buffers
                         * even if (con->conf.stream_response_body
                         *          & FDEVENT_STREAM_RESPONSE_BUFMIN)
                         * since event loop will spin on fd FDEVENT_HUP event
                         * until unregistered. */
                        handler_t rc;
                        do {
                                rc = fcgi_recv_response(srv,hctx);/*(might invalidate hctx)*/
                        } while (rc == HANDLER_GO_ON);            /*(unless HANDLER_GO_ON)*/
                        return rc; /* HANDLER_FINISHED or HANDLER_ERROR */
                } else {
                        fcgi_proc *proc = hctx->proc;
                        log_error_write(srv, __FILE__, __LINE__, "sBSbsbsd",
                                        "error: unexpected close of fastcgi connection for",
                                        con->uri.path, "?", con->uri.query,
                                        "(no fastcgi process on socket:", proc->connection_name, "?)",
                                        hctx->state);

                        fcgi_connection_close(srv, hctx);
                }
        } else if (revents & FDEVENT_ERR) {
                log_error_write(srv, __FILE__, __LINE__, "s",
                                "fcgi: got a FDEVENT_ERR. Don't know why.");

                http_response_backend_error(srv, con);
                fcgi_connection_close(srv, hctx);
        }

        return HANDLER_FINISHED;
}

#define PATCH(x) \
        p->conf.x = s->x;
static int fcgi_patch_connection(server *srv, connection *con, plugin_data *p) {
        size_t i, j;
        plugin_config *s = p->config_storage[0];

        PATCH(exts);
        PATCH(debug);
        PATCH(ext_mapping);

        /* skip the first, the global context */
        for (i = 1; i < srv->config_context->used; i++) {
                data_config *dc = (data_config *)srv->config_context->data[i];
                s = p->config_storage[i];

                /* condition didn't match */
                if (!config_check_cond(srv, con, dc)) continue;

                /* merge config */
                for (j = 0; j < dc->value->used; j++) {
                        data_unset *du = dc->value->data[j];

                        if (buffer_is_equal_string(du->key, CONST_STR_LEN("fastcgi.server"))) {
                                PATCH(exts);
                        } else if (buffer_is_equal_string(du->key, CONST_STR_LEN("fastcgi.debug"))) {
                                PATCH(debug);
                        } else if (buffer_is_equal_string(du->key, CONST_STR_LEN("fastcgi.map-extensions"))) {
                                PATCH(ext_mapping);
                        }
                }
        }

        return 0;
}
#undef PATCH


static handler_t fcgi_check_extension(server *srv, connection *con, void *p_d, int uri_path_handler) {
        plugin_data *p = p_d;
        size_t s_len;
        size_t k;
        buffer *fn;
        fcgi_extension *extension = NULL;
        fcgi_extension_host *host = NULL;

        if (con->mode != DIRECT) return HANDLER_GO_ON;

        /* Possibly, we processed already this request */
        if (con->file_started == 1) return HANDLER_GO_ON;

        fn = uri_path_handler ? con->uri.path : con->physical.path;

        if (buffer_string_is_empty(fn)) return HANDLER_GO_ON;

        s_len = buffer_string_length(fn);

        fcgi_patch_connection(srv, con, p);

        /* fastcgi.map-extensions maps extensions to existing fastcgi.server entries
         *
         * fastcgi.map-extensions = ( ".php3" => ".php" )
         *
         * fastcgi.server = ( ".php" => ... )
         *
         * */

        /* check if extension-mapping matches */
        for (k = 0; k < p->conf.ext_mapping->used; k++) {
                data_string *ds = (data_string *)p->conf.ext_mapping->data[k];
                size_t ct_len; /* length of the config entry */

                if (buffer_is_empty(ds->key)) continue;

                ct_len = buffer_string_length(ds->key);

                if (s_len < ct_len) continue;

                /* found a mapping */
                if (0 == strncmp(fn->ptr + s_len - ct_len, ds->key->ptr, ct_len)) {
                        /* check if we know the extension */

                        /* we can reuse k here */
                        for (k = 0; k < p->conf.exts->used; k++) {
                                extension = p->conf.exts->exts[k];

                                if (buffer_is_equal(ds->value, extension->key)) {
                                        break;
                                }
                        }

                        if (k == p->conf.exts->used) {
                                /* found nothign */
                                extension = NULL;
                        }
                        break;
                }
        }

        if (extension == NULL) {
                size_t uri_path_len = buffer_string_length(con->uri.path);

                /* check if extension matches */
                for (k = 0; k < p->conf.exts->used; k++) {
                        size_t ct_len; /* length of the config entry */
                        fcgi_extension *ext = p->conf.exts->exts[k];

                        if (buffer_is_empty(ext->key)) continue;

                        ct_len = buffer_string_length(ext->key);

                        /* check _url_ in the form "/fcgi_pattern" */
                        if (ext->key->ptr[0] == '/') {
                                if ((ct_len <= uri_path_len) &&
                                    (strncmp(con->uri.path->ptr, ext->key->ptr, ct_len) == 0)) {
                                        extension = ext;
                                        break;
                                }
                        } else if ((ct_len <= s_len) && (0 == strncmp(fn->ptr + s_len - ct_len, ext->key->ptr, ct_len))) {
                                /* check extension in the form ".fcg" */
                                extension = ext;
                                break;
                        }
                }
                /* extension doesn't match */
                if (NULL == extension) {
                        return HANDLER_GO_ON;
                }
        }

        /* check if we have at least one server for this extension up and running */
        for (k = 0; k < extension->used; k++) {
                fcgi_extension_host *h = extension->hosts[k];

                /* we should have at least one proc that can do something */
                if (h->active_procs == 0) {
                        continue;
                }

                /* we found one host that is alive */
                host = h;
                break;
        }

        if (!host) {
                /* sorry, we don't have a server alive for this ext */
                con->http_status = 500;
                con->mode = DIRECT;

                /* only send the 'no handler' once */
                if (!extension->note_is_sent) {
                        extension->note_is_sent = 1;

                        log_error_write(srv, __FILE__, __LINE__, "sBSbsbs",
                                        "all handlers for", con->uri.path, "?", con->uri.query,
                                        "on", extension->key,
                                        "are down.");
                }

                return HANDLER_FINISHED;
        }

        /* a note about no handler is not sent yet */
        extension->note_is_sent = 0;

        /*
         * if check-local is disabled, use the uri.path handler
         *
         */

        /* init handler-context */
        if (uri_path_handler) {
                if (host->check_local == 0) {
                        handler_ctx *hctx;
                        char *pathinfo;

                        hctx = handler_ctx_init();

                        hctx->remote_conn      = con;
                        hctx->plugin_data      = p;
                        hctx->proc             = NULL;
                        hctx->ext              = extension;


                        hctx->conf.exts        = p->conf.exts;
                        hctx->conf.debug       = p->conf.debug;

                        con->plugin_ctx[p->id] = hctx;

                        con->mode = p->id;

                        if (con->conf.log_request_handling) {
                                log_error_write(srv, __FILE__, __LINE__, "s",
                                "handling it in mod_fastcgi");
                        }

                        /* do not split path info for authorizer */
                        if (host->mode != FCGI_AUTHORIZER) {
                                /* the prefix is the SCRIPT_NAME,
                                * everything from start to the next slash
                                * this is important for check-local = "disable"
                                *
                                * if prefix = /admin.fcgi
                                *
                                * /admin.fcgi/foo/bar
                                *
                                * SCRIPT_NAME = /admin.fcgi
                                * PATH_INFO   = /foo/bar
                                *
                                * if prefix = /fcgi-bin/
                                *
                                * /fcgi-bin/foo/bar
                                *
                                * SCRIPT_NAME = /fcgi-bin/foo
                                * PATH_INFO   = /bar
                                *
                                * if prefix = /, and fix-root-path-name is enable
                                *
                                * /fcgi-bin/foo/bar
                                *
                                * SCRIPT_NAME = /fcgi-bin/foo
                                * PATH_INFO   = /bar
                                *
                                */

                                /* the rewrite is only done for /prefix/? matches */
                                if (host->fix_root_path_name && extension->key->ptr[0] == '/' && extension->key->ptr[1] == '\0') {
                                        buffer_copy_string(con->request.pathinfo, con->uri.path->ptr);
                                        buffer_string_set_length(con->uri.path, 0);
                                } else if (extension->key->ptr[0] == '/' &&
                                        buffer_string_length(con->uri.path) > buffer_string_length(extension->key) &&
                                        NULL != (pathinfo = strchr(con->uri.path->ptr + buffer_string_length(extension->key), '/'))) {
                                        /* rewrite uri.path and pathinfo */

                                        buffer_copy_string(con->request.pathinfo, pathinfo);
                                        buffer_string_set_length(con->uri.path, buffer_string_length(con->uri.path) - buffer_string_length(con->request.pathinfo));
                                }
                        }
                }
        } else {
                handler_ctx *hctx;
                hctx = handler_ctx_init();

                hctx->remote_conn      = con;
                hctx->plugin_data      = p;
                hctx->proc             = NULL;
                hctx->ext              = extension;

                hctx->conf.exts        = p->conf.exts;
                hctx->conf.debug       = p->conf.debug;

                con->plugin_ctx[p->id] = hctx;

                con->mode = p->id;

                if (con->conf.log_request_handling) {
                        log_error_write(srv, __FILE__, __LINE__, "s", "handling it in mod_fastcgi");
                }
        }

        return HANDLER_GO_ON;
}

/* uri-path handler */
static handler_t fcgi_check_extension_1(server *srv, connection *con, void *p_d) {
        return fcgi_check_extension(srv, con, p_d, 1);
}

/* start request handler */
static handler_t fcgi_check_extension_2(server *srv, connection *con, void *p_d) {
        return fcgi_check_extension(srv, con, p_d, 0);
}


TRIGGER_FUNC(mod_fastcgi_handle_trigger) {
        plugin_data *p = p_d;
        size_t i, j, n;


        /* perhaps we should kill a connect attempt after 10-15 seconds
         *
         * currently we wait for the TCP timeout which is 180 seconds on Linux
         *
         *
         *
         */

        /* check all children if they are still up */

        for (i = 0; i < srv->config_context->used; i++) {
                plugin_config *conf;
                fcgi_exts *exts;

                conf = p->config_storage[i];

                exts = conf->exts;

                for (j = 0; j < exts->used; j++) {
                        fcgi_extension *ex;

                        ex = exts->exts[j];

                        for (n = 0; n < ex->used; n++) {

                                fcgi_proc *proc;
                                fcgi_extension_host *host;

                                host = ex->hosts[n];

                                fcgi_restart_dead_procs(srv, p, host);

                                for (proc = host->unused_procs; proc; proc = proc->next) {
                                        int status;

                                        if (proc->pid == 0) continue;

                                        switch (waitpid(proc->pid, &status, WNOHANG)) {
                                        case 0:
                                                /* child still running after timeout, good */
                                                break;
                                        case -1:
                                                if (errno != EINTR) {
                                                        /* no PID found ? should never happen */
                                                        log_error_write(srv, __FILE__, __LINE__, "sddss",
                                                                        "pid ", proc->pid, proc->state,
                                                                        "not found:", strerror(errno));

#if 0
                                                        if (errno == ECHILD) {
                                                                /* someone else has cleaned up for us */
                                                                proc->pid = 0;
                                                                proc->state = PROC_STATE_UNSET;
                                                        }
#endif
                                                }
                                                break;
                                        default:
                                                /* the child should not terminate at all */
                                                if (WIFEXITED(status)) {
                                                        if (proc->state != PROC_STATE_KILLED) {
                                                                log_error_write(srv, __FILE__, __LINE__, "sdb",
                                                                                "child exited:",
                                                                                WEXITSTATUS(status), proc->connection_name);
                                                        }
                                                } else if (WIFSIGNALED(status)) {
                                                        if (WTERMSIG(status) != SIGTERM) {
                                                                log_error_write(srv, __FILE__, __LINE__, "sd",
                                                                                "child signaled:",
                                                                                WTERMSIG(status));
                                                        }
                                                } else {
                                                        log_error_write(srv, __FILE__, __LINE__, "sd",
                                                                        "child died somehow:",
                                                                        status);
                                                }
                                                proc->pid = 0;
                                                if (proc->state == PROC_STATE_RUNNING) host->active_procs--;
                                                proc->state = PROC_STATE_UNSET;
                                                host->max_id--;
                                        }
                                }
                        }
                }
        }

        return HANDLER_GO_ON;
}


int mod_fastcgi_plugin_init(plugin *p);
int mod_fastcgi_plugin_init(plugin *p) {
        p->version      = LIGHTTPD_VERSION_ID;
        p->name         = buffer_init_string("fastcgi");

        p->init         = mod_fastcgi_init;
        p->cleanup      = mod_fastcgi_free;
        p->set_defaults = mod_fastcgi_set_defaults;
        p->connection_reset        = fcgi_connection_reset;
        p->handle_connection_close = fcgi_connection_reset;
        p->handle_uri_clean        = fcgi_check_extension_1;
        p->handle_subrequest_start = fcgi_check_extension_2;
        p->handle_subrequest       = mod_fastcgi_handle_subrequest;
        p->handle_trigger          = mod_fastcgi_handle_trigger;

        p->data         = NULL;

        return 0;
}