src/mod_proxy.c

   1 #include "first.h"
   2
   3 #include "buffer.h"
   4 #include "server.h"
   5 #include "keyvalue.h"
   6 #include "log.h"
   7
   8 #include "http_chunk.h"
   9 #include "fdevent.h"
  10 #include "connections.h"
  11 #include "response.h"
  12 #include "joblist.h"
  13
  14 #include "plugin.h"
  15
  16 #include "inet_ntop_cache.h"
  17 #include "crc32.h"
  18
  19 #include <sys/types.h>
  20
  21 #include <unistd.h>
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <string.h>
  25 #include <stdlib.h>
  26 #include <ctype.h>
  27 #include <assert.h>
  28
  29 #include <stdio.h>
  30
  31 #include "sys-socket.h"
  32
  33 #define data_proxy data_fastcgi
  34 #define data_proxy_init data_fastcgi_init
  35
  36 #define PROXY_RETRY_TIMEOUT 60
  37
  38 /**
  39  *
  40  * the proxy module is based on the fastcgi module
  41  *
  42  * 28.06.2004 Jan Kneschke     The first release
  43  * 01.07.2004 Evgeny Rodichev  Several bugfixes and cleanups
  44  *            - co-ordinate up- and downstream flows correctly (proxy_demux_response
  45  *              and proxy_handle_fdevent)
  46  *            - correctly transfer upstream http_response_status;
  47  *            - some unused structures removed.
  48  *
  49  * TODO:      - delay upstream read if write_queue is too large
  50  *              (to prevent memory eating, like in apache). Shoud be
  51  *              configurable).
  52  *            - persistent connection with upstream servers
  53  *            - HTTP/1.1
  54  */
  55 typedef enum {
  56         PROXY_BALANCE_UNSET,
  57         PROXY_BALANCE_FAIR,
  58         PROXY_BALANCE_HASH,
  59         PROXY_BALANCE_RR
  60 } proxy_balance_t;
  61
  62 typedef struct {
  63         array *extensions;
  64         unsigned short debug;
  65
  66         proxy_balance_t balance;
  67 } plugin_config;
  68
  69 typedef struct {
  70         PLUGIN_DATA;
  71
  72         buffer *parse_response;
  73         buffer *balance_buf;
  74
  75         plugin_config **config_storage;
  76
  77         plugin_config conf;
  78 } plugin_data;
  79
  80 typedef enum {
  81         PROXY_STATE_INIT,
  82         PROXY_STATE_CONNECT,
  83         PROXY_STATE_PREPARE_WRITE,
  84         PROXY_STATE_WRITE,
  85         PROXY_STATE_READ
  86 } proxy_connection_state_t;
  87
  88 enum { PROXY_STDOUT, PROXY_END_REQUEST };
  89
  90 typedef struct {
  91         proxy_connection_state_t state;
  92         time_t state_timestamp;
  93
  94         data_proxy *host;
  95
  96         buffer *response;
  97         buffer *response_header;
  98
  99         chunkqueue *wb;
 100
 101         int fd; /* fd to the proxy process */
 102         int fde_ndx; /* index into the fd-event buffer */
 103
 104         size_t path_info_offset; /* start of path_info in uri.path */
 105
 106         connection *remote_conn;  /* dump pointer */
 107         plugin_data *plugin_data; /* dump pointer */
 108 } handler_ctx;
 109
 110
 111 /* ok, we need a prototype */
 112 static handler_t proxy_handle_fdevent(server *srv, void *ctx, int revents);
 113
 114 static handler_ctx * handler_ctx_init(void) {
 115         handler_ctx * hctx;
 116
 117
 118         hctx = calloc(1, sizeof(*hctx));
 119
 120         hctx->state = PROXY_STATE_INIT;
 121         hctx->host = NULL;
 122
 123         hctx->response = buffer_init();
 124         hctx->response_header = buffer_init();
 125
 126         hctx->wb = chunkqueue_init();
 127
 128         hctx->fd = -1;
 129         hctx->fde_ndx = -1;
 130
 131         return hctx;
 132 }
 133
 134 static void handler_ctx_free(handler_ctx *hctx) {
 135         buffer_free(hctx->response);
 136         buffer_free(hctx->response_header);
 137         chunkqueue_free(hctx->wb);
 138
 139         free(hctx);
 140 }
 141
 142 INIT_FUNC(mod_proxy_init) {
 143         plugin_data *p;
 144
 145         p = calloc(1, sizeof(*p));
 146
 147         p->parse_response = buffer_init();
 148         p->balance_buf = buffer_init();
 149
 150         return p;
 151 }
 152
 153
 154 FREE_FUNC(mod_proxy_free) {
 155         plugin_data *p = p_d;
 156
 157         UNUSED(srv);
 158
 159         buffer_free(p->parse_response);
 160         buffer_free(p->balance_buf);
 161
 162         if (p->config_storage) {
 163                 size_t i;
 164                 for (i = 0; i < srv->config_context->used; i++) {
 165                         plugin_config *s = p->config_storage[i];
 166
 167                         if (NULL == s) continue;
 168
 169                         array_free(s->extensions);
 170
 171                         free(s);
 172                 }
 173                 free(p->config_storage);
 174         }
 175
 176         free(p);
 177
 178         return HANDLER_GO_ON;
 179 }
 180
 181 SETDEFAULTS_FUNC(mod_proxy_set_defaults) {
 182         plugin_data *p = p_d;
 183         data_unset *du;
 184         size_t i = 0;
 185
 186         config_values_t cv[] = {
 187                 { "proxy.server",              NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION },       /* 0 */
 188                 { "proxy.debug",               NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION },       /* 1 */
 189                 { "proxy.balance",             NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },      /* 2 */
 190                 { NULL,                        NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
 191         };
 192
 193         p->config_storage = calloc(1, srv->config_context->used * sizeof(plugin_config *));
 194
 195         for (i = 0; i < srv->config_context->used; i++) {
 196                 data_config const* config = (data_config const*)srv->config_context->data[i];
 197                 plugin_config *s;
 198
 199                 s = malloc(sizeof(plugin_config));
 200                 s->extensions    = array_init();
 201                 s->debug         = 0;
 202
 203                 cv[0].destination = s->extensions;
 204                 cv[1].destination = &(s->debug);
 205                 cv[2].destination = p->balance_buf;
 206
 207                 buffer_reset(p->balance_buf);
 208
 209                 p->config_storage[i] = s;
 210
 211                 if (0 != config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) {
 212                         return HANDLER_ERROR;
 213                 }
 214
 215                 if (buffer_string_is_empty(p->balance_buf)) {
 216                         s->balance = PROXY_BALANCE_FAIR;
 217                 } else if (buffer_is_equal_string(p->balance_buf, CONST_STR_LEN("fair"))) {
 218                         s->balance = PROXY_BALANCE_FAIR;
 219                 } else if (buffer_is_equal_string(p->balance_buf, CONST_STR_LEN("round-robin"))) {
 220                         s->balance = PROXY_BALANCE_RR;
 221                 } else if (buffer_is_equal_string(p->balance_buf, CONST_STR_LEN("hash"))) {
 222                         s->balance = PROXY_BALANCE_HASH;
 223                 } else {
 224                         log_error_write(srv, __FILE__, __LINE__, "sb",
 225                                         "proxy.balance has to be one of: fair, round-robin, hash, but not:", p->balance_buf);
 226                         return HANDLER_ERROR;
 227                 }
 228
 229                 if (NULL != (du = array_get_element(config->value, "proxy.server"))) {
 230                         size_t j;
 231                         data_array *da = (data_array *)du;
 232
 233                         if (du->type != TYPE_ARRAY) {
 234                                 log_error_write(srv, __FILE__, __LINE__, "sss",
 235                                                 "unexpected type for key: ", "proxy.server", "expected ( \"ext\" => ( \"backend-label\" => ( \"key\" => \"value\" )))");
 236
 237                                 return HANDLER_ERROR;
 238                         }
 239
 240                         /*
 241                          * proxy.server = ( "<ext>" => ...,
 242                          *                  "<ext>" => ... )
 243                          */
 244
 245                         for (j = 0; j < da->value->used; j++) {
 246                                 data_array *da_ext = (data_array *)da->value->data[j];
 247                                 size_t n;
 248
 249                                 if (da_ext->type != TYPE_ARRAY) {
 250                                         log_error_write(srv, __FILE__, __LINE__, "sssbs",
 251                                                         "unexpected type for key: ", "proxy.server",
 252                                                         "[", da->value->data[j]->key, "](string); expected ( \"ext\" => ( \"backend-label\" => ( \"key\" => \"value\" )))");
 253
 254                                         return HANDLER_ERROR;
 255                                 }
 256
 257                                 /*
 258                                  * proxy.server = ( "<ext>" =>
 259                                  *                     ( "<host>" => ( ... ),
 260                                  *                       "<host>" => ( ... )
 261                                  *                     ),
 262                                  *                    "<ext>" => ... )
 263                                  */
 264
 265                                 for (n = 0; n < da_ext->value->used; n++) {
 266                                         data_array *da_host = (data_array *)da_ext->value->data[n];
 267
 268                                         data_proxy *df;
 269                                         data_array *dfa;
 270
 271                                         config_values_t pcv[] = {
 272                                                 { "host",              NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },      /* 0 */
 273                                                 { "port",              NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION },       /* 1 */
 274                                                 { NULL,                NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
 275                                         };
 276
 277                                         if (da_host->type != TYPE_ARRAY) {
 278                                                 log_error_write(srv, __FILE__, __LINE__, "ssSBS",
 279                                                                 "unexpected type for key:",
 280                                                                 "proxy.server",
 281                                                                 "[", da_ext->value->data[n]->key, "](string); expected ( \"ext\" => ( \"backend-label\" => ( \"key\" => \"value\" )))");
 282
 283                                                 return HANDLER_ERROR;
 284                                         }
 285
 286                                         df = data_proxy_init();
 287
 288                                         df->port = 80;
 289
 290                                         buffer_copy_buffer(df->key, da_host->key);
 291
 292                                         pcv[0].destination = df->host;
 293                                         pcv[1].destination = &(df->port);
 294
 295                                         if (0 != config_insert_values_internal(srv, da_host->value, pcv, T_CONFIG_SCOPE_CONNECTION)) {
 296                                                 df->free((data_unset*) df);
 297                                                 return HANDLER_ERROR;
 298                                         }
 299
 300                                         if (buffer_string_is_empty(df->host)) {
 301                                                 log_error_write(srv, __FILE__, __LINE__, "sbbbs",
 302                                                                 "missing key (string):",
 303                                                                 da->key,
 304                                                                 da_ext->key,
 305                                                                 da_host->key,
 306                                                                 "host");
 307
 308                                                 df->free((data_unset*) df);
 309                                                 return HANDLER_ERROR;
 310                                         }
 311
 312                                         /* if extension already exists, take it */
 313
 314                                         if (NULL == (dfa = (data_array *)array_get_element(s->extensions, da_ext->key->ptr))) {
 315                                                 dfa = data_array_init();
 316
 317                                                 buffer_copy_buffer(dfa->key, da_ext->key);
 318
 319                                                 array_insert_unique(dfa->value, (data_unset *)df);
 320                                                 array_insert_unique(s->extensions, (data_unset *)dfa);
 321                                         } else {
 322                                                 array_insert_unique(dfa->value, (data_unset *)df);
 323                                         }
 324                                 }
 325                         }
 326                 }
 327         }
 328
 329         return HANDLER_GO_ON;
 330 }
 331
 332 static void proxy_connection_close(server *srv, handler_ctx *hctx) {
 333         plugin_data *p;
 334         connection *con;
 335
 336         p    = hctx->plugin_data;
 337         con  = hctx->remote_conn;
 338
 339         if (hctx->fd != -1) {
 340                 fdevent_event_del(srv->ev, &(hctx->fde_ndx), hctx->fd);
 341                 fdevent_unregister(srv->ev, hctx->fd);
 342
 343                 close(hctx->fd);
 344                 srv->cur_fds--;
 345         }
 346
 347         if (hctx->host) {
 348                 hctx->host->usage--;
 349         }
 350
 351         handler_ctx_free(hctx);
 352         con->plugin_ctx[p->id] = NULL;
 353
 354         /* finish response (if not already con->file_started, con->file_finished) */
 355         if (con->mode == p->id) {
 356                 http_response_backend_done(srv, con);
 357         }
 358 }
 359
 360 static int proxy_establish_connection(server *srv, handler_ctx *hctx) {
 361         struct sockaddr *proxy_addr;
 362         struct sockaddr_in proxy_addr_in;
 363 #if defined(HAVE_SYS_UN_H)
 364         struct sockaddr_un proxy_addr_un;
 365 #endif
 366 #if defined(HAVE_IPV6) && defined(HAVE_INET_PTON)
 367         struct sockaddr_in6 proxy_addr_in6;
 368 #endif
 369         socklen_t servlen;
 370
 371         plugin_data *p    = hctx->plugin_data;
 372         data_proxy *host= hctx->host;
 373         int proxy_fd       = hctx->fd;
 374
 375
 376 #if defined(HAVE_SYS_UN_H)
 377         if (strstr(host->host->ptr, "/")) {
 378                 if (buffer_string_length(host->host) + 1 > sizeof(proxy_addr_un.sun_path)) {
 379                         log_error_write(srv, __FILE__, __LINE__, "sB",
 380                                 "ERROR: Unix Domain socket filename too long:",
 381                                 host->host);
 382                         return -1;
 383                 }
 384
 385                 memset(&proxy_addr_un, 0, sizeof(proxy_addr_un));
 386                 proxy_addr_un.sun_family = AF_UNIX;
 387                 strcpy(proxy_addr_un.sun_path, host->host->ptr);
 388                 servlen = sizeof(proxy_addr_un);
 389                 proxy_addr = (struct sockaddr *) &proxy_addr_un;
 390         } else
 391 #endif
 392 #if defined(HAVE_IPV6) && defined(HAVE_INET_PTON)
 393         if (strstr(host->host->ptr, ":")) {
 394                 memset(&proxy_addr_in6, 0, sizeof(proxy_addr_in6));
 395                 proxy_addr_in6.sin6_family = AF_INET6;
 396                 inet_pton(AF_INET6, host->host->ptr, (char *) &proxy_addr_in6.sin6_addr);
 397                 proxy_addr_in6.sin6_port = htons(host->port);
 398                 servlen = sizeof(proxy_addr_in6);
 399                 proxy_addr = (struct sockaddr *) &proxy_addr_in6;
 400         } else
 401 #endif
 402         {
 403                 memset(&proxy_addr_in, 0, sizeof(proxy_addr_in));
 404                 proxy_addr_in.sin_family = AF_INET;
 405                 proxy_addr_in.sin_addr.s_addr = inet_addr(host->host->ptr);
 406                 proxy_addr_in.sin_port = htons(host->port);
 407                 servlen = sizeof(proxy_addr_in);
 408                 proxy_addr = (struct sockaddr *) &proxy_addr_in;
 409         }
 410
 411
 412         if (-1 == connect(proxy_fd, proxy_addr, servlen)) {
 413                 if (errno == EINPROGRESS || errno == EALREADY) {
 414                         if (p->conf.debug) {
 415                                 log_error_write(srv, __FILE__, __LINE__, "sd",
 416                                                 "connect delayed:", proxy_fd);
 417                         }
 418
 419                         return 1;
 420                 } else {
 421
 422                         log_error_write(srv, __FILE__, __LINE__, "sdsd",
 423                                         "connect failed:", proxy_fd, strerror(errno), errno);
 424
 425                         return -1;
 426                 }
 427         }
 428         if (p->conf.debug) {
 429                 log_error_write(srv, __FILE__, __LINE__, "sd",
 430                                 "connect succeeded: ", proxy_fd);
 431         }
 432
 433         return 0;
 434 }
 435
 436 static void proxy_set_header(connection *con, const char *key, const char *value) {
 437         data_string *ds_dst;
 438
 439         if (NULL == (ds_dst = (data_string *)array_get_unused_element(con->request.headers, TYPE_STRING))) {
 440                 ds_dst = data_string_init();
 441         }
 442
 443         buffer_copy_string(ds_dst->key, key);
 444         buffer_copy_string(ds_dst->value, value);
 445         array_insert_unique(con->request.headers, (data_unset *)ds_dst);
 446 }
 447
 448 static void proxy_append_header(connection *con, const char *key, const char *value) {
 449         data_string *ds_dst;
 450
 451         if (NULL == (ds_dst = (data_string *)array_get_unused_element(con->request.headers, TYPE_STRING))) {
 452                 ds_dst = data_string_init();
 453         }
 454
 455         buffer_copy_string(ds_dst->key, key);
 456         buffer_append_string(ds_dst->value, value);
 457         array_insert_unique(con->request.headers, (data_unset *)ds_dst);
 458 }
 459
 460
 461 static int proxy_create_env(server *srv, handler_ctx *hctx) {
 462         size_t i;
 463
 464         connection *con   = hctx->remote_conn;
 465         buffer *b;
 466
 467         /* build header */
 468
 469         b = buffer_init();
 470
 471         /* request line */
 472         buffer_copy_string(b, get_http_method_name(con->request.http_method));
 473         buffer_append_string_len(b, CONST_STR_LEN(" "));
 474
 475         buffer_append_string_buffer(b, con->request.uri);
 476         buffer_append_string_len(b, CONST_STR_LEN(" HTTP/1.0\r\n"));
 477
 478         proxy_append_header(con, "X-Forwarded-For", (char *)inet_ntop_cache_get_ip(srv, &(con->dst_addr)));
 479         /* http_host is NOT is just a pointer to a buffer
 480          * which is NULL if it is not set */
 481         if (!buffer_string_is_empty(con->request.http_host)) {
 482                 proxy_set_header(con, "X-Host", con->request.http_host->ptr);
 483         }
 484         proxy_set_header(con, "X-Forwarded-Proto", con->uri.scheme->ptr);
 485
 486         /* request header */
 487         for (i = 0; i < con->request.headers->used; i++) {
 488                 data_string *ds;
 489
 490                 ds = (data_string *)con->request.headers->data[i];
 491
 492                 if (!buffer_is_empty(ds->value) && !buffer_is_empty(ds->key)) {
 493                         if (buffer_is_equal_caseless_string(ds->key, CONST_STR_LEN("Connection"))) continue;
 494                         if (buffer_is_equal_caseless_string(ds->key, CONST_STR_LEN("Proxy-Connection"))) continue;
 495
 496                         buffer_append_string_buffer(b, ds->key);
 497                         buffer_append_string_len(b, CONST_STR_LEN(": "));
 498                         buffer_append_string_buffer(b, ds->value);
 499                         buffer_append_string_len(b, CONST_STR_LEN("\r\n"));
 500                 }
 501         }
 502
 503         buffer_append_string_len(b, CONST_STR_LEN("Connection: close\r\n\r\n"));
 504
 505         chunkqueue_append_buffer(hctx->wb, b);
 506         buffer_free(b);
 507
 508         /* body */
 509
 510         if (con->request.content_length) {
 511                 chunkqueue *req_cq = con->request_content_queue;
 512
 513                 chunkqueue_steal(hctx->wb, req_cq, req_cq->bytes_in);
 514         }
 515
 516         return 0;
 517 }
 518
 519 static int proxy_set_state(server *srv, handler_ctx *hctx, proxy_connection_state_t state) {
 520         hctx->state = state;
 521         hctx->state_timestamp = srv->cur_ts;
 522
 523         return 0;
 524 }
 525
 526
 527 static int proxy_response_parse(server *srv, connection *con, plugin_data *p, buffer *in) {
 528         char *s, *ns;
 529         int http_response_status = -1;
 530
 531         UNUSED(srv);
 532
 533         /* [\r]\n -> [\0]\0 */
 534
 535         buffer_copy_buffer(p->parse_response, in);
 536
 537         for (s = p->parse_response->ptr; NULL != (ns = strchr(s, '\n')); s = ns + 1) {
 538                 char *key, *value;
 539                 int key_len;
 540                 data_string *ds;
 541                 int copy_header;
 542
 543                 ns[0] = '\0';
 544                 if (s != ns && ns[-1] == '\r') ns[-1] = '\0';
 545
 546                 if (-1 == http_response_status) {
 547                         /* The first line of a Response message is the Status-Line */
 548
 549                         for (key=s; *key && *key != ' '; key++);
 550
 551                         if (*key) {
 552                                 http_response_status = (int) strtol(key, NULL, 10);
 553                                 if (http_response_status < 100 || http_response_status >= 1000) http_response_status = 502;
 554                         } else {
 555                                 http_response_status = 502;
 556                         }
 557
 558                         con->http_status = http_response_status;
 559                         con->parsed_response |= HTTP_STATUS;
 560                         continue;
 561                 }
 562
 563                 if (NULL == (value = strchr(s, ':'))) {
 564                         /* now we expect: "<key>: <value>\n" */
 565
 566                         continue;
 567                 }
 568
 569                 key = s;
 570                 key_len = value - key;
 571
 572                 value++;
 573                 /* strip WS */
 574                 while (*value == ' ' || *value == '\t') value++;
 575
 576                 copy_header = 1;
 577
 578                 switch(key_len) {
 579                 case 4:
 580                         if (0 == strncasecmp(key, "Date", key_len)) {
 581                                 con->parsed_response |= HTTP_DATE;
 582                         }
 583                         break;
 584                 case 8:
 585                         if (0 == strncasecmp(key, "Location", key_len)) {
 586                                 con->parsed_response |= HTTP_LOCATION;
 587                         }
 588                         break;
 589                 case 10:
 590                         if (0 == strncasecmp(key, "Connection", key_len)) {
 591                                 copy_header = 0;
 592                         }
 593                         break;
 594                 case 14:
 595                         if (0 == strncasecmp(key, "Content-Length", key_len)) {
 596                                 con->response.content_length = strtoul(value, NULL, 10);
 597                                 con->parsed_response |= HTTP_CONTENT_LENGTH;
 598                         }
 599                         break;
 600                 default:
 601                         break;
 602                 }
 603
 604                 if (copy_header) {
 605                         if (NULL == (ds = (data_string *)array_get_unused_element(con->response.headers, TYPE_STRING))) {
 606                                 ds = data_response_init();
 607                         }
 608                         buffer_copy_string_len(ds->key, key, key_len);
 609                         buffer_copy_string(ds->value, value);
 610
 611                         array_insert_unique(con->response.headers, (data_unset *)ds);
 612                 }
 613         }
 614
 615         return 0;
 616 }
 617
 618
 619 static int proxy_demux_response(server *srv, handler_ctx *hctx) {
 620         int fin = 0;
 621         int b;
 622         ssize_t r;
 623
 624         plugin_data *p    = hctx->plugin_data;
 625         connection *con   = hctx->remote_conn;
 626         int proxy_fd       = hctx->fd;
 627
 628         /* check how much we have to read */
 629         if (ioctl(hctx->fd, FIONREAD, &b)) {
 630                 log_error_write(srv, __FILE__, __LINE__, "sd",
 631                                 "ioctl failed: ",
 632                                 proxy_fd);
 633                 return -1;
 634         }
 635
 636
 637         if (p->conf.debug) {
 638                 log_error_write(srv, __FILE__, __LINE__, "sd",
 639                                 "proxy - have to read:", b);
 640         }
 641
 642         if (b > 0) {
 643                 buffer_string_prepare_append(hctx->response, b);
 644
 645                 if (-1 == (r = read(hctx->fd, hctx->response->ptr + buffer_string_length(hctx->response), buffer_string_space(hctx->response)))) {
 646                         if (errno == EAGAIN) return 0;
 647                         log_error_write(srv, __FILE__, __LINE__, "sds",
 648                                         "unexpected end-of-file (perhaps the proxy process died):",
 649                                         proxy_fd, strerror(errno));
 650                         return -1;
 651                 }
 652
 653                 /* this should be catched by the b > 0 above */
 654                 force_assert(r);
 655
 656                 buffer_commit(hctx->response, r);
 657
 658 #if 0
 659                 log_error_write(srv, __FILE__, __LINE__, "sdsbs",
 660                                 "demux: Response buffer len", hctx->response->used, ":", hctx->response, ":");
 661 #endif
 662
 663                 if (0 == con->got_response) {
 664                         con->got_response = 1;
 665                         buffer_string_prepare_copy(hctx->response_header, 1023);
 666                 }
 667
 668                 if (0 == con->file_started) {
 669                         char *c;
 670
 671                         /* search for the \r\n\r\n in the string */
 672                         if (NULL != (c = buffer_search_string_len(hctx->response, CONST_STR_LEN("\r\n\r\n")))) {
 673                                 size_t hlen = c - hctx->response->ptr + 4;
 674                                 size_t blen = buffer_string_length(hctx->response) - hlen;
 675                                 /* found */
 676
 677                                 buffer_append_string_len(hctx->response_header, hctx->response->ptr, hlen);
 678 #if 0
 679                                 log_error_write(srv, __FILE__, __LINE__, "sb", "Header:", hctx->response_header);
 680 #endif
 681                                 /* parse the response header */
 682                                 proxy_response_parse(srv, con, p, hctx->response_header);
 683
 684                                 /* enable chunked-transfer-encoding */
 685                                 if (con->request.http_version == HTTP_VERSION_1_1 &&
 686                                     !(con->parsed_response & HTTP_CONTENT_LENGTH)) {
 687                                         con->response.transfer_encoding = HTTP_TRANSFER_ENCODING_CHUNKED;
 688                                 }
 689
 690                                 con->file_started = 1;
 691                                 if (blen > 0) {
 692                                         if (0 != http_chunk_append_mem(srv, con, c + 4, blen)) {
 693                                                 /* error writing to tempfile;
 694                                                  * truncate response or send 500 if nothing sent yet */
 695                                                 fin = 1;
 696                                                 con->file_started = 0;
 697                                         }
 698                                 }
 699                                 buffer_reset(hctx->response);
 700                         }
 701                 } else {
 702                         if (0 != http_chunk_append_buffer(srv, con, hctx->response)) {
 703                                 /* error writing to tempfile;
 704                                  * truncate response or send 500 if nothing sent yet */
 705                                 fin = 1;
 706                         }
 707                         buffer_reset(hctx->response);
 708                 }
 709
 710         } else {
 711                 /* reading from upstream done */
 712                 con->file_finished = 1;
 713
 714                 http_chunk_close(srv, con);
 715
 716                 fin = 1;
 717         }
 718
 719         return fin;
 720 }
 721
 722
 723 static handler_t proxy_write_request(server *srv, handler_ctx *hctx) {
 724         data_proxy *host= hctx->host;
 725         connection *con   = hctx->remote_conn;
 726
 727         int ret;
 728
 729         if (!host || buffer_string_is_empty(host->host) || !host->port) return HANDLER_ERROR;
 730
 731         switch(hctx->state) {
 732         case PROXY_STATE_CONNECT:
 733                 /* wait for the connect() to finish */
 734
 735                 /* connect failed ? */
 736                 if (-1 == hctx->fde_ndx) return HANDLER_ERROR;
 737
 738                 /* wait */
 739                 return HANDLER_WAIT_FOR_EVENT;
 740
 741         case PROXY_STATE_INIT:
 742 #if defined(HAVE_SYS_UN_H)
 743                 if (strstr(host->host->ptr,"/")) {
 744                         if (-1 == (hctx->fd = socket(AF_UNIX, SOCK_STREAM, 0))) {
 745                                 log_error_write(srv, __FILE__, __LINE__, "ss", "socket failed: ", strerror(errno));
 746                                 return HANDLER_ERROR;
 747                         }
 748                 } else
 749 #endif
 750 #if defined(HAVE_IPV6) && defined(HAVE_INET_PTON)
 751                 if (strstr(host->host->ptr,":")) {
 752                         if (-1 == (hctx->fd = socket(AF_INET6, SOCK_STREAM, 0))) {
 753                                 log_error_write(srv, __FILE__, __LINE__, "ss", "socket failed: ", strerror(errno));
 754                                 return HANDLER_ERROR;
 755                         }
 756                 } else
 757 #endif
 758                 {
 759                         if (-1 == (hctx->fd = socket(AF_INET, SOCK_STREAM, 0))) {
 760                                 log_error_write(srv, __FILE__, __LINE__, "ss", "socket failed: ", strerror(errno));
 761                                 return HANDLER_ERROR;
 762                         }
 763                 }
 764                 hctx->fde_ndx = -1;
 765
 766                 srv->cur_fds++;
 767
 768                 fdevent_register(srv->ev, hctx->fd, proxy_handle_fdevent, hctx);
 769
 770                 if (-1 == fdevent_fcntl_set(srv->ev, hctx->fd)) {
 771                         log_error_write(srv, __FILE__, __LINE__, "ss", "fcntl failed: ", strerror(errno));
 772
 773                         return HANDLER_ERROR;
 774                 }
 775
 776                 switch (proxy_establish_connection(srv, hctx)) {
 777                 case 1:
 778                         proxy_set_state(srv, hctx, PROXY_STATE_CONNECT);
 779
 780                         /* connection is in progress, wait for an event and call getsockopt() below */
 781
 782                         fdevent_event_set(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_OUT);
 783
 784                         return HANDLER_WAIT_FOR_EVENT;
 785                 case -1:
 786                         /* if ECONNREFUSED choose another connection -> FIXME */
 787                         hctx->fde_ndx = -1;
 788
 789                         return HANDLER_ERROR;
 790                 default:
 791                         /* everything is ok, go on */
 792                         proxy_set_state(srv, hctx, PROXY_STATE_PREPARE_WRITE);
 793                         break;
 794                 }
 795
 796                 /* fall through */
 797
 798         case PROXY_STATE_PREPARE_WRITE:
 799                 proxy_create_env(srv, hctx);
 800
 801                 proxy_set_state(srv, hctx, PROXY_STATE_WRITE);
 802
 803                 /* fall through */
 804         case PROXY_STATE_WRITE:;
 805                 ret = srv->network_backend_write(srv, con, hctx->fd, hctx->wb, MAX_WRITE_LIMIT);
 806
 807                 chunkqueue_remove_finished_chunks(hctx->wb);
 808
 809                 if (-1 == ret) { /* error on our side */
 810                         log_error_write(srv, __FILE__, __LINE__, "ssd", "write failed:", strerror(errno), errno);
 811
 812                         return HANDLER_ERROR;
 813                 } else if (-2 == ret) { /* remote close */
 814                         log_error_write(srv, __FILE__, __LINE__, "ssd", "write failed, remote connection close:", strerror(errno), errno);
 815
 816                         return HANDLER_ERROR;
 817                 }
 818
 819                 if (hctx->wb->bytes_out == hctx->wb->bytes_in) {
 820                         proxy_set_state(srv, hctx, PROXY_STATE_READ);
 821                         fdevent_event_set(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_IN);
 822                 } else {
 823                         fdevent_event_set(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_IN|FDEVENT_OUT);
 824                 }
 825
 826                 return HANDLER_WAIT_FOR_EVENT;
 827         case PROXY_STATE_READ:
 828                 /* waiting for a response */
 829                 return HANDLER_WAIT_FOR_EVENT;
 830         default:
 831                 log_error_write(srv, __FILE__, __LINE__, "s", "(debug) unknown state");
 832                 return HANDLER_ERROR;
 833         }
 834 }
 835
 836 #define PATCH(x) \
 837         p->conf.x = s->x;
 838 static int mod_proxy_patch_connection(server *srv, connection *con, plugin_data *p) {
 839         size_t i, j;
 840         plugin_config *s = p->config_storage[0];
 841
 842         PATCH(extensions);
 843         PATCH(debug);
 844         PATCH(balance);
 845
 846         /* skip the first, the global context */
 847         for (i = 1; i < srv->config_context->used; i++) {
 848                 data_config *dc = (data_config *)srv->config_context->data[i];
 849                 s = p->config_storage[i];
 850
 851                 /* condition didn't match */
 852                 if (!config_check_cond(srv, con, dc)) continue;
 853
 854                 /* merge config */
 855                 for (j = 0; j < dc->value->used; j++) {
 856                         data_unset *du = dc->value->data[j];
 857
 858                         if (buffer_is_equal_string(du->key, CONST_STR_LEN("proxy.server"))) {
 859                                 PATCH(extensions);
 860                         } else if (buffer_is_equal_string(du->key, CONST_STR_LEN("proxy.debug"))) {
 861                                 PATCH(debug);
 862                         } else if (buffer_is_equal_string(du->key, CONST_STR_LEN("proxy.balance"))) {
 863                                 PATCH(balance);
 864                         }
 865                 }
 866         }
 867
 868         return 0;
 869 }
 870 #undef PATCH
 871
 872 static handler_t proxy_send_request(server *srv, handler_ctx *hctx) {
 873         /* ok, create the request */
 874         handler_t rc = proxy_write_request(srv, hctx);
 875         if (HANDLER_ERROR != rc) {
 876                 return rc;
 877         } else {
 878                 data_proxy *host = hctx->host;
 879                 connection *con  = hctx->remote_conn;
 880                 log_error_write(srv, __FILE__, __LINE__,  "sbdd", "proxy-server disabled:",
 881                                 host->host,
 882                                 host->port,
 883                                 hctx->fd);
 884
 885                 /* disable this server */
 886                 host->is_disabled = 1;
 887                 host->disable_ts = srv->cur_ts;
 888
 889                 /* reset the enviroment and restart the sub-request */
 890                 con->mode = DIRECT;/*(avoid changing con->state, con->http_status)*/
 891                 proxy_connection_close(srv, hctx);
 892                 con->mode = hctx->plugin_data->id; /* p->id */
 893
 894                 return HANDLER_COMEBACK;
 895         }
 896 }
 897
 898 SUBREQUEST_FUNC(mod_proxy_handle_subrequest) {
 899         plugin_data *p = p_d;
 900
 901         handler_ctx *hctx = con->plugin_ctx[p->id];
 902
 903         if (NULL == hctx) return HANDLER_GO_ON;
 904
 905         /* not my job */
 906         if (con->mode != p->id) return HANDLER_GO_ON;
 907
 908         if (con->state == CON_STATE_READ_POST) {
 909                 handler_t r = connection_handle_read_post_state(srv, con);
 910                 if (r != HANDLER_GO_ON) return r;
 911         }
 912
 913         return (hctx->state != PROXY_STATE_READ)
 914           ? proxy_send_request(srv, hctx)
 915           : HANDLER_WAIT_FOR_EVENT;
 916 }
 917
 918 static handler_t proxy_handle_fdevent(server *srv, void *ctx, int revents) {
 919         handler_ctx *hctx = ctx;
 920         connection  *con  = hctx->remote_conn;
 921         plugin_data *p    = hctx->plugin_data;
 922
 923         joblist_append(srv, con);
 924
 925         if ((revents & FDEVENT_IN) &&
 926             hctx->state == PROXY_STATE_READ) {
 927
 928                 if (p->conf.debug) {
 929                         log_error_write(srv, __FILE__, __LINE__, "sd",
 930                                         "proxy: fdevent-in", hctx->state);
 931                 }
 932
 933                 switch (proxy_demux_response(srv, hctx)) {
 934                 case 0:
 935                         break;
 936                 case 1:
 937                         /* we are done */
 938                         proxy_connection_close(srv, hctx);
 939
 940                         return HANDLER_FINISHED;
 941                 case -1:
 942                         if (con->file_started == 0) {
 943                                 /* reading response headers failed */
 944                         } else {
 945                                 /* response might have been already started, kill the connection */
 946                                 con->keep_alive = 0;
 947                                 con->file_finished = 1;
 948                                 con->mode = DIRECT; /*(avoid sending final chunked block)*/
 949                         }
 950
 951                         proxy_connection_close(srv, hctx);
 952
 953                         return HANDLER_FINISHED;
 954                 }
 955         }
 956
 957         if (revents & FDEVENT_OUT) {
 958                 if (p->conf.debug) {
 959                         log_error_write(srv, __FILE__, __LINE__, "sd",
 960                                         "proxy: fdevent-out", hctx->state);
 961                 }
 962
 963                 if (hctx->state == PROXY_STATE_CONNECT) {
 964                         int socket_error;
 965                         socklen_t socket_error_len = sizeof(socket_error);
 966
 967                         /* try to finish the connect() */
 968                         if (0 != getsockopt(hctx->fd, SOL_SOCKET, SO_ERROR, &socket_error, &socket_error_len)) {
 969                                 log_error_write(srv, __FILE__, __LINE__, "ss",
 970                                         "getsockopt failed:", strerror(errno));
 971
 972                                 return HANDLER_FINISHED;
 973                         }
 974                         if (socket_error != 0) {
 975                                 log_error_write(srv, __FILE__, __LINE__, "ss",
 976                                         "establishing connection failed:", strerror(socket_error),
 977                                         "port:", hctx->host->port);
 978
 979                                 return HANDLER_FINISHED;
 980                         }
 981                         if (p->conf.debug) {
 982                                 log_error_write(srv, __FILE__, __LINE__,  "s", "proxy - connect - delayed success");
 983                         }
 984
 985                         proxy_set_state(srv, hctx, PROXY_STATE_PREPARE_WRITE);
 986                 }
 987
 988                 if (hctx->state == PROXY_STATE_PREPARE_WRITE ||
 989                     hctx->state == PROXY_STATE_WRITE) {
 990                         /* we are allowed to send something out
 991                          *
 992                          * 1. after a just finished connect() call
 993                          * 2. in a unfinished write() call (long POST request)
 994                          */
 995                         return proxy_send_request(srv, hctx); /*(might invalidate hctx)*/
 996                 } else {
 997                         log_error_write(srv, __FILE__, __LINE__, "sd",
 998                                         "proxy: out", hctx->state);
 999                 }
1000         }
1001
1002         /* perhaps this issue is already handled */
1003         if (revents & FDEVENT_HUP) {
1004                 if (p->conf.debug) {
1005                         log_error_write(srv, __FILE__, __LINE__, "sd",
1006                                         "proxy: fdevent-hup", hctx->state);
1007                 }
1008
1009                 if (hctx->state == PROXY_STATE_CONNECT) {
1010                         /* connect() -> EINPROGRESS -> HUP */
1011
1012                         /**
1013                          * what is proxy is doing if it can't reach the next hop ?
1014                          *
1015                          */
1016
1017                         if (hctx->host) {
1018                                 hctx->host->is_disabled = 1;
1019                                 hctx->host->disable_ts = srv->cur_ts;
1020                                 log_error_write(srv, __FILE__, __LINE__,  "sbdd", "proxy-server disabled:",
1021                                                 hctx->host->host,
1022                                                 hctx->host->port,
1023                                                 hctx->fd);
1024
1025                                 /* disable this server */
1026                                 hctx->host->is_disabled = 1;
1027                                 hctx->host->disable_ts = srv->cur_ts;
1028
1029                                 /* reset the environment and restart the sub-request */
1030                                 con->mode = DIRECT;/*(avoid changing con->state, con->http_status)*/
1031                                 proxy_connection_close(srv, hctx);
1032                                 con->mode = p->id;
1033                         } else {
1034                                 proxy_connection_close(srv, hctx);
1035                                 con->http_status = 503;
1036                         }
1037                 } else {
1038                         proxy_connection_close(srv, hctx);
1039                 }
1040         } else if (revents & FDEVENT_ERR) {
1041                 log_error_write(srv, __FILE__, __LINE__, "sd", "proxy-FDEVENT_ERR, but no HUP", revents);
1042
1043                 if (con->file_started) {
1044                         con->keep_alive = 0;
1045                         con->file_finished = 1;
1046                         con->mode = DIRECT; /*(avoid sending final chunked block)*/
1047                 }
1048                 proxy_connection_close(srv, hctx);
1049         }
1050
1051         return HANDLER_FINISHED;
1052 }
1053
1054 static handler_t mod_proxy_check_extension(server *srv, connection *con, void *p_d) {
1055         plugin_data *p = p_d;
1056         size_t s_len;
1057         unsigned long last_max = ULONG_MAX;
1058         int max_usage = INT_MAX;
1059         int ndx = -1;
1060         size_t k;
1061         buffer *fn;
1062         data_array *extension = NULL;
1063         size_t path_info_offset;
1064
1065         if (con->mode != DIRECT) return HANDLER_GO_ON;
1066
1067         /* Possibly, we processed already this request */
1068         if (con->file_started == 1) return HANDLER_GO_ON;
1069
1070         mod_proxy_patch_connection(srv, con, p);
1071
1072         fn = con->uri.path;
1073         if (buffer_string_is_empty(fn)) return HANDLER_ERROR;
1074         s_len = buffer_string_length(fn);
1075
1076         path_info_offset = 0;
1077
1078         if (p->conf.debug) {
1079                 log_error_write(srv, __FILE__, __LINE__,  "s", "proxy - start");
1080         }
1081
1082         /* check if extension matches */
1083         for (k = 0; k < p->conf.extensions->used; k++) {
1084                 data_array *ext = NULL;
1085                 size_t ct_len;
1086
1087                 ext = (data_array *)p->conf.extensions->data[k];
1088
1089                 if (buffer_is_empty(ext->key)) continue;
1090
1091                 ct_len = buffer_string_length(ext->key);
1092
1093                 if (s_len < ct_len) continue;
1094
1095                 /* check extension in the form "/proxy_pattern" */
1096                 if (*(ext->key->ptr) == '/') {
1097                         if (strncmp(fn->ptr, ext->key->ptr, ct_len) == 0) {
1098                                 if (s_len > ct_len + 1) {
1099                                         char *pi_offset;
1100
1101                                         if (NULL != (pi_offset = strchr(fn->ptr + ct_len + 1, '/'))) {
1102                                                 path_info_offset = pi_offset - fn->ptr;
1103                                         }
1104                                 }
1105                                 extension = ext;
1106                                 break;
1107                         }
1108                 } else if (0 == strncmp(fn->ptr + s_len - ct_len, ext->key->ptr, ct_len)) {
1109                         /* check extension in the form ".fcg" */
1110                         extension = ext;
1111                         break;
1112                 }
1113         }
1114
1115         if (NULL == extension) {
1116                 return HANDLER_GO_ON;
1117         }
1118
1119         if (p->conf.debug) {
1120                 log_error_write(srv, __FILE__, __LINE__,  "s", "proxy - ext found");
1121         }
1122
1123         if (extension->value->used == 1) {
1124                 if ( ((data_proxy *)extension->value->data[0])->is_disabled ) {
1125                         ndx = -1;
1126                 } else {
1127                         ndx = 0;
1128                 }
1129         } else if (extension->value->used != 0) switch(p->conf.balance) {
1130         case PROXY_BALANCE_HASH:
1131                 /* hash balancing */
1132
1133                 if (p->conf.debug) {
1134                         log_error_write(srv, __FILE__, __LINE__,  "sd",
1135                                         "proxy - used hash balancing, hosts:", extension->value->used);
1136                 }
1137
1138                 for (k = 0, ndx = -1, last_max = ULONG_MAX; k < extension->value->used; k++) {
1139                         data_proxy *host = (data_proxy *)extension->value->data[k];
1140                         unsigned long cur_max;
1141
1142                         if (host->is_disabled) continue;
1143
1144                         cur_max = generate_crc32c(CONST_BUF_LEN(con->uri.path)) +
1145                                 generate_crc32c(CONST_BUF_LEN(host->host)) + /* we can cache this */
1146                                 generate_crc32c(CONST_BUF_LEN(con->uri.authority));
1147
1148                         if (p->conf.debug) {
1149                                 log_error_write(srv, __FILE__, __LINE__,  "sbbbd",
1150                                                 "proxy - election:",
1151                                                 con->uri.path,
1152                                                 host->host,
1153                                                 con->uri.authority,
1154                                                 cur_max);
1155                         }
1156
1157                         if ((last_max == ULONG_MAX) || /* first round */
1158                             (cur_max > last_max)) {
1159                                 last_max = cur_max;
1160
1161                                 ndx = k;
1162                         }
1163                 }
1164
1165                 break;
1166         case PROXY_BALANCE_FAIR:
1167                 /* fair balancing */
1168                 if (p->conf.debug) {
1169                         log_error_write(srv, __FILE__, __LINE__,  "s",
1170                                         "proxy - used fair balancing");
1171                 }
1172
1173                 for (k = 0, ndx = -1, max_usage = INT_MAX; k < extension->value->used; k++) {
1174                         data_proxy *host = (data_proxy *)extension->value->data[k];
1175
1176                         if (host->is_disabled) continue;
1177
1178                         if (host->usage < max_usage) {
1179                                 max_usage = host->usage;
1180
1181                                 ndx = k;
1182                         }
1183                 }
1184
1185                 break;
1186         case PROXY_BALANCE_RR: {
1187                 data_proxy *host;
1188
1189                 /* round robin */
1190                 if (p->conf.debug) {
1191                         log_error_write(srv, __FILE__, __LINE__,  "s",
1192                                         "proxy - used round-robin balancing");
1193                 }
1194
1195                 /* just to be sure */
1196                 force_assert(extension->value->used < INT_MAX);
1197
1198                 host = (data_proxy *)extension->value->data[0];
1199
1200                 /* Use last_used_ndx from first host in list */
1201                 k = host->last_used_ndx;
1202                 ndx = k + 1; /* use next host after the last one */
1203                 if (ndx < 0) ndx = 0;
1204
1205                 /* Search first active host after last_used_ndx */
1206                 while ( ndx < (int) extension->value->used
1207                                 && (host = (data_proxy *)extension->value->data[ndx])->is_disabled ) ndx++;
1208
1209                 if (ndx >= (int) extension->value->used) {
1210                         /* didn't found a higher id, wrap to the start */
1211                         for (ndx = 0; ndx <= (int) k; ndx++) {
1212                                 host = (data_proxy *)extension->value->data[ndx];
1213                                 if (!host->is_disabled) break;
1214                         }
1215
1216                         /* No active host found */
1217                         if (host->is_disabled) ndx = -1;
1218                 }
1219
1220                 /* Save new index for next round */
1221                 ((data_proxy *)extension->value->data[0])->last_used_ndx = ndx;
1222
1223                 break;
1224         }
1225         default:
1226                 break;
1227         }
1228
1229         /* found a server */
1230         if (ndx != -1) {
1231                 data_proxy *host = (data_proxy *)extension->value->data[ndx];
1232
1233                 /*
1234                  * if check-local is disabled, use the uri.path handler
1235                  *
1236                  */
1237
1238                 /* init handler-context */
1239                 handler_ctx *hctx;
1240                 hctx = handler_ctx_init();
1241
1242                 hctx->path_info_offset = path_info_offset;
1243                 hctx->remote_conn      = con;
1244                 hctx->plugin_data      = p;
1245                 hctx->host             = host;
1246
1247                 con->plugin_ctx[p->id] = hctx;
1248
1249                 host->usage++;
1250
1251                 con->mode = p->id;
1252
1253                 if (p->conf.debug) {
1254                         log_error_write(srv, __FILE__, __LINE__,  "sbd",
1255                                         "proxy - found a host",
1256                                         host->host, host->port);
1257                 }
1258
1259                 return HANDLER_GO_ON;
1260         } else {
1261                 /* no handler found */
1262                 con->http_status = 500;
1263
1264                 log_error_write(srv, __FILE__, __LINE__,  "sb",
1265                                 "no proxy-handler found for:",
1266                                 fn);
1267
1268                 return HANDLER_FINISHED;
1269         }
1270         return HANDLER_GO_ON;
1271 }
1272
1273 static handler_t mod_proxy_connection_reset(server *srv, connection *con, void *p_d) {
1274         plugin_data *p = p_d;
1275         handler_ctx *hctx = con->plugin_ctx[p->id];
1276         if (hctx) proxy_connection_close(srv, hctx);
1277
1278         return HANDLER_GO_ON;
1279 }
1280
1281 /**
1282  *
1283  * the trigger re-enables the disabled connections after the timeout is over
1284  *
1285  * */
1286
1287 TRIGGER_FUNC(mod_proxy_trigger) {
1288         plugin_data *p = p_d;
1289
1290         if (p->config_storage) {
1291                 size_t i, n, k;
1292                 for (i = 0; i < srv->config_context->used; i++) {
1293                         plugin_config *s = p->config_storage[i];
1294
1295                         if (!s) continue;
1296
1297                         /* get the extensions for all configs */
1298
1299                         for (k = 0; k < s->extensions->used; k++) {
1300                                 data_array *extension = (data_array *)s->extensions->data[k];
1301
1302                                 /* get all hosts */
1303                                 for (n = 0; n < extension->value->used; n++) {
1304                                         data_proxy *host = (data_proxy *)extension->value->data[n];
1305
1306                                         if (!host->is_disabled ||
1307                                             srv->cur_ts - host->disable_ts < 5) continue;
1308
1309                                         log_error_write(srv, __FILE__, __LINE__,  "sbd",
1310                                                         "proxy - re-enabled:",
1311                                                         host->host, host->port);
1312
1313                                         host->is_disabled = 0;
1314                                 }
1315                         }
1316                 }
1317         }
1318
1319         return HANDLER_GO_ON;
1320 }
1321
1322
1323 int mod_proxy_plugin_init(plugin *p);
1324 int mod_proxy_plugin_init(plugin *p) {
1325         p->version      = LIGHTTPD_VERSION_ID;
1326         p->name         = buffer_init_string("proxy");
1327
1328         p->init         = mod_proxy_init;
1329         p->cleanup      = mod_proxy_free;
1330         p->set_defaults = mod_proxy_set_defaults;
1331         p->connection_reset        = mod_proxy_connection_reset; /* end of req-resp cycle */
1332         p->handle_connection_close = mod_proxy_connection_reset; /* end of client connection */
1333         p->handle_uri_clean        = mod_proxy_check_extension;
1334         p->handle_subrequest       = mod_proxy_handle_subrequest;
1335         p->handle_trigger          = mod_proxy_trigger;
1336
1337         p->data         = NULL;
1338
1339         return 0;
1340 }