mistral.c

   1 #ifdef HAVE_CONFIG_H
   2 #include "config.h"
   3 #endif
   4
   5 #include "php.h"
   6 #include "ext/standard/info.h"
   7
   8 #include <sys/types.h>
   9 #include <sys/socket.h>
  10 #include <netinet/in.h>
  11 #include <arpa/inet.h>
  12 #include <netdb.h>
  13 #include <sys/time.h>
  14 #include <stdlib.h>
  15 #include <stdio.h>
  16 #include <unistd.h>
  17 #include <string.h>
  18 #include <fcntl.h>
  19 #include <errno.h>
  20 #include <err.h>
  21 #include <stddef.h>
  22
  23 #include <ev.h>
  24
  25 #include "mistral.h"
  26
  27 /*
  28  * We did use some ideas from:
  29  *      https://sie.isc.org/svn/nmsg-httpk/trunk/nmsg-httpk.c
  30  *      http://github.com/ry/libebb/blob/master/ebb.c
  31  */
  32
  33 struct client {
  34         int fd;
  35
  36         ev_io ev_read;
  37         ev_io ev_write;
  38         ev_timer ev_timeout;
  39         ev_timer ev_goodbye;
  40
  41         zval retval;
  42 };
  43
  44 ev_io ev_accept;
  45 double timeout = 300;
  46
  47 typedef struct _php_event_callback_t { /* {{{ */
  48         zval *func;
  49         zval *arg;
  50 } php_event_callback_t;
  51 /* }}} */
  52
  53 php_event_callback_t *callback = NULL;
  54
  55 static int setnonblock(int fd)
  56 {
  57         int flags;
  58
  59         flags = fcntl(fd, F_GETFL);
  60         if (flags < 0)
  61                 return flags;
  62         flags |= O_NONBLOCK;
  63         if (fcntl(fd, F_SETFL, flags) < 0)
  64                 return -1;
  65
  66         return 0;
  67 }
  68
  69 static inline void _php_event_callback_free(php_event_callback_t *this_callback) /* {{{ */
  70 {
  71         if (!this_callback) {
  72                 return;
  73         }
  74
  75         zval_ptr_dtor(&this_callback->func);
  76         if (this_callback->arg) {
  77                 zval_ptr_dtor(&this_callback->arg);
  78         }
  79         efree(this_callback);
  80 }
  81
  82 static void timeout_cb(struct ev_loop *loop, struct ev_timer *w, int revents) {
  83         struct client *cli = (struct client *) w->data;
  84         assert(w == &cli->ev_timeout);
  85
  86         ev_timer_start(loop, &cli->ev_goodbye);
  87 }
  88
  89 static void goodbye_cb(struct ev_loop *loop, struct ev_timer *w, int revents) {
  90         struct client *cli = (struct client *) w->data;
  91         assert(w == &cli->ev_goodbye);
  92
  93         ev_io_stop(loop, &cli->ev_read);
  94         ev_io_stop(loop, &cli->ev_write);
  95         ev_timer_stop(loop, &cli->ev_timeout);
  96
  97         close(cli->fd);
  98 }
  99
 100 static void write_cb(struct ev_loop *loop, struct ev_io *w, int revents)
 101 {
 102         struct client *cli = (struct client *) w->data;
 103
 104         if(EV_ERROR & revents) {
 105                 ev_timer_start(loop, &cli->ev_goodbye);
 106                 return;
 107         }
 108
 109         if (revents & EV_WRITE) {
 110                 if (Z_TYPE_P(&cli->retval) == IS_STRING) {
 111                         char *test = (char *) malloc((256 + Z_STRLEN_P(&cli->retval)) * sizeof(char));
 112                         int i = snprintf(test, 1024, "HTTP/1.1 200 OK\r\nConnection: %s\r\nContent-Type: text/plain\r\nServer: mistral/0.1\r\nContent-Length: %u\r\n\r\n%s",
 113                                         (timeout == 0.0 ? "close" : "keep-alive"), Z_STRLEN_P(&cli->retval), Z_STRVAL_P(&cli->retval));
 114                         write(cli->fd, test, i);
 115
 116                         free(test);
 117                         ev_io_stop(EV_A_ w);
 118                 }
 119         }
 120
 121         zval_dtor(&cli->retval);
 122
 123         if (timeout == 0.0) {
 124                 ev_timer_start(loop, &cli->ev_goodbye);
 125         } else {
 126                 ev_timer_again(loop, &cli->ev_timeout);
 127                 ev_io_start(loop, &cli->ev_read);
 128         }
 129 }
 130
 131 static void read_cb(struct ev_loop *loop, struct ev_io *w, int revents)
 132 {
 133         if ((revents & EV_READ) && callback) {
 134                 char *rbuff = emalloc(1024);
 135                 if (rbuff) {
 136                         struct client *cli = (struct client *) w->data;
 137                         int r = 0;
 138                         r = read(cli->fd,rbuff,1023);
 139
 140                         if (r > 0) {
 141                                 zval *http_headers[1];
 142                                 ev_io_stop(EV_A_ w);
 143                                 rbuff[r] = '\0';
 144
 145                                 MAKE_STD_ZVAL(http_headers[0]);
 146                                 ZVAL_STRINGL (http_headers[0], rbuff, r, 0);
 147
 148                                 if (call_user_function(EG(function_table), NULL, callback->func, &cli->retval, 1, http_headers TSRMLS_CC) == SUCCESS) {
 149                                         ev_io_start(loop,&cli->ev_write);
 150                                         zval_dtor(http_headers[0]); /* Free's the string */
 151                                         FREE_ZVAL(http_headers[0]); /* Free's the object itself */
 152                                         return; /* NO PROCESSING ANYMORE!! */
 153                                 } else {
 154                                         zval_dtor(http_headers[0]);
 155                                         FREE_ZVAL(http_headers[0]);
 156                                         zval_dtor(&cli->retval);
 157                                 }
 158                         }
 159                         efree(rbuff);
 160                 }
 161         }
 162
 163         struct client *cli = (struct client *) w->data;
 164         ev_io_stop(EV_A_ w);
 165         ev_timer_start(loop, &cli->ev_goodbye);
 166 }
 167
 168 static void accept_cb(struct ev_loop *loop, struct ev_io *w, int revents)
 169 {
 170         int client_fd;
 171         struct client *cli;
 172         struct sockaddr_in client_addr;
 173         socklen_t client_len = sizeof(client_addr);
 174         client_fd = accept(w->fd, (struct sockaddr *)&client_addr, &client_len);
 175         if (client_fd == -1)
 176                 return;
 177
 178         cli = calloc(1,sizeof(struct client));
 179         cli->fd = client_fd;
 180         if (setnonblock(cli->fd) < 0)
 181                 err(1, "failed to set client socket to non-blocking");
 182
 183         ev_io_init(&cli->ev_read, read_cb, cli->fd, EV_READ);
 184         cli->ev_read.data    = cli;
 185
 186         ev_io_init(&cli->ev_write, write_cb, cli->fd, EV_WRITE);
 187         cli->ev_write.data   = cli;
 188
 189         ev_timer_init(&cli->ev_goodbye, goodbye_cb, 0., 0.);
 190         cli->ev_goodbye.data = cli;
 191
 192         ev_timer_init(&cli->ev_timeout, timeout_cb, 0., (timeout == 0.0 ? 30.0 : timeout));
 193         cli->ev_timeout.data = cli;
 194
 195         ev_io_start(loop,&cli->ev_read);
 196 }
 197
 198 /* {{{ mistral_functions[] */
 199         zend_function_entry mistral_functions[] = {
 200                 PHP_FE(mistral_init, NULL)
 201                         PHP_FE(mistral_register_callback, NULL)
 202                         PHP_FE(mistral_start, NULL)
 203                         { NULL, NULL, NULL }
 204         };
 205 /* }}} */
 206
 207 /* {{{ mistral_module_entry
 208  * */
 209 zend_module_entry mistral_module_entry = {
 210         STANDARD_MODULE_HEADER,
 211         "mistral",
 212         mistral_functions,
 213         NULL,                 /* Replace with NULL if there is nothing to do at php startup   */
 214         PHP_MSHUTDOWN(mistral),
 215         NULL,                 /* Replace with NULL if there is nothing to do at request start */
 216         NULL,                 /* Replace with NULL if there is nothing to do at request end   */
 217         PHP_MINFO(mistral),
 218         PHP_MISTRAL_VERSION,
 219         STANDARD_MODULE_PROPERTIES
 220 };
 221 /* }}} */
 222
 223 #ifdef COMPILE_DL_MISTRAL
 224 ZEND_GET_MODULE(mistral)
 225 #endif
 226
 227         /* {{{ PHP_MINFO_FUNCTION */
 228 PHP_MINFO_FUNCTION(mistral)
 229 {
 230         php_info_print_table_start();
 231         php_info_print_table_header(2, "Mistral support", "enabled");
 232         php_info_print_table_row(2, "Version",  PHP_MISTRAL_VERSION);
 233         php_info_print_table_end();
 234 }
 235 /* }}} */
 236
 237 /* {{{ PHP_MSHUTDOWN_FUNCTION */
 238 PHP_MSHUTDOWN_FUNCTION (mistral)
 239 {
 240         _php_event_callback_free(callback);
 241 }
 242 /* }}} */
 243
 244 PHP_FUNCTION(mistral_init)
 245 {
 246         struct addrinfo *ai = NULL;
 247         struct addrinfo hints;
 248         struct addrinfo *runp;
 249         int listen_sock = -1;
 250
 251         char *listen_addr;
 252         int   listen_addr_len;
 253         long  listen_port;
 254
 255         struct sockaddr_storage sin;
 256         struct sockaddr_in * sa4 = (struct sockaddr_in *) &sin;
 257         struct sockaddr_in6 * sa6 = (struct sockaddr_in6 *) &sin;
 258
 259         int reuseaddr_on = 1;
 260         int keepalive_on = 1;
 261
 262         if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "sld", &listen_addr, &listen_addr_len, &listen_port, &timeout) == FAILURE) {
 263                 RETURN_NULL();
 264         }
 265
 266         if (listen_port < 1 || listen_port > 65535) {
 267                 RETURN_NULL();
 268         }
 269
 270         bzero(&hints, sizeof (hints));
 271         hints.ai_flags = AI_ADDRCONFIG || AI_NUMERICSERV;
 272         hints.ai_socktype = SOCK_STREAM;
 273
 274         if  (getaddrinfo (listen_addr, "", &hints, &ai) != 0) {
 275                 RETURN_NULL();
 276         }
 277
 278         runp = ai;
 279
 280         while (runp != NULL && listen_sock < 0) {
 281                 listen_sock = socket(runp->ai_family, SOCK_STREAM, 0);
 282                 if (listen_sock < 0)
 283                         runp = runp->ai_next;
 284         }
 285
 286         if (listen_sock < 0) {
 287                 err(1, "listen failed");
 288         }
 289
 290         if (timeout <= 0.0) {
 291                 timeout = 0.0;
 292         } else {
 293                 if (setsockopt(listen_sock, SOL_SOCKET, SO_KEEPALIVE, &keepalive_on, sizeof(keepalive_on)) == -1)
 294                         err(1, "setsockopt failed");
 295         }
 296
 297         if (setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &reuseaddr_on, sizeof(reuseaddr_on)) == -1)
 298                 err(1, "setsockopt failed");
 299
 300         if (runp->ai_family == AF_INET6) {
 301                 int null = 0;
 302                 setsockopt(listen_sock, IPPROTO_IPV6, IPV6_V6ONLY, &null, sizeof(null));
 303         }
 304
 305         memset(&sin, 0, sizeof(sin));
 306
 307         sin.ss_family = runp->ai_family;
 308         switch (sin.ss_family) {
 309                 case AF_INET6:
 310                         inet_pton(sin.ss_family, listen_addr, &(sa6->sin6_addr));
 311                         sa6->sin6_port = htons(listen_port);
 312                         break;
 313                 case AF_INET:
 314                         if ( strchr(listen_addr, ':') )
 315                                 /* Invalid IPv4-string. Use the wildcard address. */
 316                                 listen_addr = strdup("0.0.0.0");
 317
 318                         inet_pton(sin.ss_family, listen_addr, &(sa4->sin_addr));
 319                         sa4->sin_port = htons(listen_port);
 320         }
 321
 322         if (ai)
 323                 freeaddrinfo (ai);
 324
 325         if (bind(listen_sock, (struct sockaddr *) &sin, sizeof(sin)) < 0)
 326                 err(1, "bind failed");
 327
 328         if (listen(listen_sock, 5) < 0)
 329                 err(1, "listen failed");
 330
 331         if (setnonblock(listen_sock) < 0)
 332                 err(1, "failed to set server socket to non-blocking");
 333
 334         ev_io_init(&ev_accept, accept_cb, listen_sock, EV_READ);
 335 }
 336
 337 /* {{{ proto bool event_set(resource event, resource fd, int events, mixed callback[, mixed arg])
 338  * Taken from pecl::libevent event_set
 339  */
 340 PHP_FUNCTION(mistral_register_callback)
 341 {
 342         zval *zcallback, *zarg = NULL;
 343         php_event_callback_t *new_callback, *old_callback;
 344         char *func_name;
 345
 346         if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z", &zcallback) != SUCCESS) {
 347                 return;
 348         }
 349
 350         if (!zend_is_callable(zcallback, 0, &func_name TSRMLS_CC)) {
 351                 php_error_docref(NULL TSRMLS_CC, E_WARNING, "'%s' is not a valid callback", func_name);
 352                 efree(func_name);
 353                 RETURN_FALSE;
 354         }
 355         efree(func_name);
 356
 357         zval_add_ref(&zcallback);
 358
 359         new_callback = emalloc(sizeof(php_event_callback_t));
 360         new_callback->func = zcallback;
 361         new_callback->arg = zarg;
 362
 363         old_callback = callback;
 364         callback = new_callback;
 365
 366         if (old_callback) {
 367                 _php_event_callback_free(old_callback);
 368         }
 369         RETURN_TRUE;
 370 }
 371 /* }}} */
 372
 373 PHP_FUNCTION(mistral_start)
 374 {
 375         struct ev_loop *loop = ev_default_loop (0);
 376
 377         ev_io_start(loop, &ev_accept);
 378         ev_loop(loop, 0);
 379 }