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         struct ev_loop *loop;
  42         char *rbuff;
  43         int rlen;
  44
  45         int close;
  46 };
  47
  48 ev_io ev_accept;
  49 double timeout = 300;
  50
  51 typedef struct _php_event_callback_t { /* {{{ */
  52         zval *func;
  53         zval *arg;
  54 } php_event_callback_t;
  55 /* }}} */
  56
  57 php_event_callback_t *callback = NULL;
  58
  59 static int setnonblock(int fd)
  60 {
  61         int flags;
  62
  63         flags = fcntl(fd, F_GETFL);
  64         if (flags < 0)
  65                 return flags;
  66         flags |= O_NONBLOCK;
  67         if (fcntl(fd, F_SETFL, flags) < 0)
  68                 return -1;
  69
  70         return 0;
  71 }
  72
  73 static inline void _php_event_callback_free(php_event_callback_t *this_callback) /* {{{ */
  74 {
  75         if (!this_callback) {
  76                 return;
  77         }
  78
  79         zval_ptr_dtor(&this_callback->func);
  80         if (this_callback->arg) {
  81                 zval_ptr_dtor(&this_callback->arg);
  82         }
  83         efree(this_callback);
  84 }
  85
  86 static void timeout_cb(struct ev_loop *loop, struct ev_timer *w, int revents) {
  87         struct client *cli = (struct client *) w->data;
  88         assert(w == &cli->ev_timeout);
  89
  90         ev_timer_start(loop, &cli->ev_goodbye);
  91 }
  92
  93 static void goodbye_cb(struct ev_loop *loop, struct ev_timer *w, int revents) {
  94         struct client *cli = (struct client *) w->data;
  95         assert(w == &cli->ev_goodbye);
  96
  97         ev_io_stop(loop, &cli->ev_read);
  98         ev_io_stop(loop, &cli->ev_write);
  99         ev_timer_stop(loop, &cli->ev_timeout);
 100
 101         close(cli->fd);
 102         free(cli);
 103 }
 104
 105 static void write_cb(struct ev_loop *loop, struct ev_io *w, int revents)
 106 {
 107         struct client *cli = (struct client *) w->data;
 108
 109         if (EV_ERROR & revents) {
 110                 ev_timer_start(loop, &cli->ev_goodbye);
 111                 return;
 112         }
 113
 114         if (revents & EV_WRITE) {
 115                 if (cli->rbuff) {
 116                         write(cli->fd, cli->rbuff, cli->rlen);
 117                         free(cli->rbuff);
 118                 }
 119                 ev_io_stop(EV_A_ w);
 120         }
 121
 122         if (cli->close == 1 || timeout == 0.0) {
 123                 ev_timer_start(loop, &cli->ev_goodbye);
 124         } else {
 125                 ev_timer_again(loop, &cli->ev_timeout);
 126                 ev_io_start(loop, &cli->ev_read);
 127         }
 128 }
 129
 130 static inline void* execute_php(void *_cli) {
 131         int result;
 132         struct client *cli = (struct client *) _cli;
 133         zval retval;
 134
 135         zval *http_headers[1];
 136
 137         cli->rbuff[cli->rlen] = '\0';
 138
 139         MAKE_STD_ZVAL(http_headers[0]);
 140         ZVAL_STRINGL (http_headers[0], cli->rbuff, (cli->rlen + 1), 0);
 141
 142         result = call_user_function(EG(function_table), NULL, callback->func, &retval, 1, http_headers TSRMLS_CC);
 143         free(cli->rbuff);
 144         cli->rbuff = NULL;
 145         cli->rlen  = 0;
 146         FREE_ZVAL(http_headers[0]); /* Free's the object itself */
 147
 148         if (result == SUCCESS) {
 149                 if (Z_TYPE_P(&retval) == IS_STRING) {
 150                         cli->rlen  = 256 + Z_STRLEN_P(&retval);
 151                         cli->rbuff = (char *) malloc(cli->rlen * sizeof(char));
 152                         cli->rlen  = snprintf(cli->rbuff, (cli->rlen - 1), "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",
 153                                         (timeout == 0.0 ? "close" : "keep-alive"), Z_STRLEN_P(&retval), Z_STRVAL_P(&retval));
 154
 155                 } else if (Z_TYPE_P(&retval) == IS_ARRAY) {
 156                         HashTable *arr_hash = Z_ARRVAL_P(&retval);
 157                         HashPosition pointer;
 158                         zval **data;
 159                         int header_len = 11; /* HTTP/1.1 \r\n */
 160                         int body_len = 0;
 161                         int status_len = 0;
 162                         char *status_code = NULL;
 163                         char *body = NULL;
 164                         char *test;
 165
 166                         for (zend_hash_internal_pointer_reset_ex(arr_hash, &pointer);
 167                                         zend_hash_get_current_data_ex(arr_hash, (void**) &data, &pointer) == SUCCESS;
 168                                         zend_hash_move_forward_ex(arr_hash, &pointer)) {
 169                                 char *key;
 170                                 int key_len;
 171                                 long index;
 172
 173                                 if (zend_hash_get_current_key_ex(arr_hash, &key, &key_len, &index, 0, &pointer) == HASH_KEY_IS_STRING) {
 174                                         zval temp = **data;
 175                                         zval_copy_ctor(&temp);
 176                                         convert_to_string(&temp);
 177
 178                                         if (Z_STRLEN(temp) > 0) {
 179                                                 if (php_strcmp("status_code", key, key_len - 1)) {
 180                                                         status_code = strdup(Z_STRVAL(temp));
 181                                                         status_len += Z_STRLEN(temp);
 182                                                 } else if (php_strcmp("body", key, key_len - 1)) {
 183                                                         body_len += Z_STRLEN(temp);
 184                                                 } else { /* So it is a header */
 185                                                         header_len += key_len - 1;
 186                                                         header_len += 4; /* : \r\n */
 187                                                         header_len += Z_STRLEN(temp);
 188
 189                                                         if (php_strcasecmp("Connection", key, key_len - 1) && php_strcasecmp("close", Z_STRVAL(temp), Z_STRLEN(temp))) {
 190                                                                 cli->close = 1;
 191                                                         }
 192                                                 }
 193                                         }
 194                                         zval_dtor(&temp);
 195                                 }
 196                         }
 197
 198                         cli->rlen  = (header_len + (status_len == 0 ? 8 : status_len + 2) + body_len);
 199                         cli->rbuff = (char *) malloc(cli->rlen * sizeof(char));
 200                         test = cli->rbuff;
 201
 202                         if (status_len == 0) {
 203                                 strncpy(test, "HTTP/1.1 200 OK\r\n", 17);
 204                                 test += 17;
 205                         } else {
 206                                 strncpy(test, "HTTP/1.1 ", 9);
 207                                 test += 9;
 208                                 strncpy(test, status_code, status_len);
 209                                 test += status_len;
 210                                 strncpy(test, "\r\n", 2);
 211                                 test += 2;
 212                                 free(status_code);
 213                         }
 214
 215                         for (zend_hash_internal_pointer_reset_ex(arr_hash, &pointer);
 216                                         zend_hash_get_current_data_ex(arr_hash, (void**) &data, &pointer) == SUCCESS;
 217                                         zend_hash_move_forward_ex(arr_hash, &pointer)) {
 218                                 char *key;
 219                                 int key_len;
 220                                 long index;
 221
 222                                 if (zend_hash_get_current_key_ex(arr_hash, &key, &key_len, &index, 0, &pointer) == HASH_KEY_IS_STRING) {
 223                                         zval temp = **data;
 224                                         zval_copy_ctor(&temp);
 225                                         convert_to_string(&temp);
 226
 227                                         if (Z_STRLEN(temp) > 0) {
 228                                                 if (status_len > 0 && php_strcmp("status_code", key, key_len - 1)) {
 229                                                         /* do nothing */
 230                                                 } else if (body_len > 0 && php_strcmp("body", key, key_len - 1)) {
 231                                                         body = strdup(Z_STRVAL(temp));
 232                                                 } else { /* So it is a header */
 233                                                         strncpy(test, key, key_len - 1);
 234                                                         test += key_len - 1;
 235                                                         strncpy(test, ": ", 2);
 236                                                         test += 2;
 237                                                         strncpy(test, Z_STRVAL(temp), Z_STRLEN(temp));
 238                                                         test += Z_STRLEN(temp);
 239                                                         strncpy(test, "\r\n", 2);
 240                                                         test += 2;
 241                                                 }
 242                                         }
 243                                         zval_dtor(&temp);
 244                                 }
 245                         }
 246
 247                         strncpy(test, "\r\n", 2);
 248                         test += 2;
 249
 250                         if (body) {
 251                                 strncpy(test, body, body_len);
 252                                 free(body);
 253                                 test += body_len;
 254                         }
 255                 }
 256
 257                 ev_io_start(cli->loop,&cli->ev_write);
 258         }
 259
 260         zval_dtor(&retval);
 261
 262         if (result != SUCCESS) {
 263                 ev_timer_start(cli->loop, &cli->ev_goodbye);
 264         }
 265 }
 266
 267 static void read_cb(struct ev_loop *loop, struct ev_io *w, int revents)
 268 {
 269         if ((revents & EV_READ) && callback) {
 270                 struct client *cli = (struct client *) w->data;
 271                 cli->rbuff = malloc(1024);
 272                 if (cli->rbuff) {
 273                         cli->rlen = read(cli->fd,cli->rbuff,1023);
 274                         if (cli->rlen > 0) {
 275                                 ev_io_stop(EV_A_ w);
 276                                 cli->loop = loop;
 277                                 execute_php(cli);
 278                                 return;
 279                         } else {
 280                                 free(cli->rbuff);
 281                                 cli->rbuff = NULL;
 282                                 cli->rlen  = 0;
 283                         }
 284                 }
 285         }
 286
 287         struct client *cli = (struct client *) w->data;
 288         ev_io_stop(EV_A_ w);
 289         ev_timer_start(loop, &cli->ev_goodbye);
 290 }
 291
 292 static void accept_cb(struct ev_loop *loop, struct ev_io *w, int revents)
 293 {
 294         int client_fd;
 295         struct client *cli;
 296         struct sockaddr_in client_addr;
 297         socklen_t client_len = sizeof(client_addr);
 298         client_fd = accept(w->fd, (struct sockaddr *)&client_addr, &client_len);
 299         if (client_fd == -1)
 300                 return;
 301
 302         cli = calloc(1,sizeof(struct client));
 303         cli->rbuff = NULL;
 304         cli->rlen  = 0;
 305         cli->fd = client_fd;
 306         if (setnonblock(cli->fd) < 0)
 307                 err(1, "failed to set client socket to non-blocking");
 308
 309         ev_io_init(&cli->ev_read, read_cb, cli->fd, EV_READ);
 310         cli->ev_read.data    = cli;
 311
 312         ev_io_init(&cli->ev_write, write_cb, cli->fd, EV_WRITE);
 313         cli->ev_write.data   = cli;
 314
 315         ev_timer_init(&cli->ev_goodbye, goodbye_cb, 0., 0.);
 316         cli->ev_goodbye.data = cli;
 317
 318         ev_timer_init(&cli->ev_timeout, timeout_cb, 0., (timeout == 0.0 ? 30.0 : timeout));
 319         cli->ev_timeout.data = cli;
 320
 321         ev_io_start(loop,&cli->ev_read);
 322 }
 323
 324 /* {{{ mistral_functions[] */
 325         zend_function_entry mistral_functions[] = {
 326                 PHP_FE(mistral_init, NULL)
 327                         PHP_FE(mistral_register_callback, NULL)
 328                         PHP_FE(mistral_start, NULL)
 329                         { NULL, NULL, NULL }
 330         };
 331 /* }}} */
 332
 333 /* {{{ mistral_module_entry
 334  * */
 335 zend_module_entry mistral_module_entry = {
 336         STANDARD_MODULE_HEADER,
 337         "mistral",
 338         mistral_functions,
 339         NULL,                 /* Replace with NULL if there is nothing to do at php startup   */
 340         PHP_MSHUTDOWN(mistral),
 341         NULL,                 /* Replace with NULL if there is nothing to do at request start */
 342         NULL,                 /* Replace with NULL if there is nothing to do at request end   */
 343         PHP_MINFO(mistral),
 344         PHP_MISTRAL_VERSION,
 345         STANDARD_MODULE_PROPERTIES
 346 };
 347 /* }}} */
 348
 349 #ifdef COMPILE_DL_MISTRAL
 350 ZEND_GET_MODULE(mistral)
 351 #endif
 352
 353         /* {{{ PHP_MINFO_FUNCTION */
 354 PHP_MINFO_FUNCTION(mistral)
 355 {
 356         php_info_print_table_start();
 357         php_info_print_table_header(2, "Mistral support", "enabled");
 358         php_info_print_table_row(2, "Version",  PHP_MISTRAL_VERSION);
 359         php_info_print_table_end();
 360 }
 361 /* }}} */
 362
 363 /* {{{ PHP_MSHUTDOWN_FUNCTION */
 364 PHP_MSHUTDOWN_FUNCTION (mistral)
 365 {
 366         _php_event_callback_free(callback);
 367 }
 368 /* }}} */
 369
 370 PHP_FUNCTION(mistral_init)
 371 {
 372         struct addrinfo *ai = NULL;
 373         struct addrinfo hints;
 374         struct addrinfo *runp;
 375         int listen_sock = -1;
 376
 377         char *listen_addr;
 378         int   listen_addr_len;
 379         long  listen_port;
 380
 381         struct sockaddr_storage sin;
 382         struct sockaddr_in * sa4 = (struct sockaddr_in *) &sin;
 383         struct sockaddr_in6 * sa6 = (struct sockaddr_in6 *) &sin;
 384
 385         int reuseaddr_on = 1;
 386         int keepalive_on = 1;
 387
 388         if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "sld", &listen_addr, &listen_addr_len, &listen_port, &timeout) == FAILURE) {
 389                 RETURN_NULL();
 390         }
 391
 392         if (listen_port < 1 || listen_port > 65535) {
 393                 RETURN_NULL();
 394         }
 395
 396         bzero(&hints, sizeof (hints));
 397         hints.ai_flags = AI_ADDRCONFIG || AI_NUMERICSERV;
 398         hints.ai_socktype = SOCK_STREAM;
 399
 400         if (getaddrinfo(listen_addr, "", &hints, &ai) != 0) {
 401                 RETURN_NULL();
 402         }
 403
 404         runp = ai;
 405
 406         while (runp != NULL && listen_sock < 0) {
 407                 listen_sock = socket(runp->ai_family, SOCK_STREAM, 0);
 408                 if (listen_sock < 0)
 409                         runp = runp->ai_next;
 410         }
 411
 412         if (listen_sock < 0) {
 413                 err(1, "listen failed");
 414         }
 415
 416         if (timeout <= 0.0) {
 417                 timeout = 0.0;
 418         } else {
 419                 if (setsockopt(listen_sock, SOL_SOCKET, SO_KEEPALIVE, &keepalive_on, sizeof(keepalive_on)) == -1)
 420                         err(1, "setsockopt failed");
 421         }
 422
 423         if (setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &reuseaddr_on, sizeof(reuseaddr_on)) == -1)
 424                 err(1, "setsockopt failed");
 425
 426         if (runp->ai_family == AF_INET6) {
 427                 int null = 0;
 428                 setsockopt(listen_sock, IPPROTO_IPV6, IPV6_V6ONLY, &null, sizeof(null));
 429         }
 430
 431         memset(&sin, 0, sizeof(sin));
 432
 433         sin.ss_family = runp->ai_family;
 434         switch (sin.ss_family) {
 435                 case AF_INET6:
 436                         inet_pton(sin.ss_family, listen_addr, &(sa6->sin6_addr));
 437                         sa6->sin6_port = htons(listen_port);
 438                         break;
 439                 case AF_INET:
 440                         if ( strchr(listen_addr, ':') )
 441                                 /* Invalid IPv4-string. Use the wildcard address. */
 442                                 listen_addr = strdup("0.0.0.0");
 443
 444                         inet_pton(sin.ss_family, listen_addr, &(sa4->sin_addr));
 445                         sa4->sin_port = htons(listen_port);
 446         }
 447
 448         if (ai)
 449                 freeaddrinfo(ai);
 450
 451         if (bind(listen_sock, (struct sockaddr *) &sin, sizeof(sin)) < 0)
 452                 err(1, "bind failed");
 453
 454         if (listen(listen_sock, 5) < 0)
 455                 err(1, "listen failed");
 456
 457         if (setnonblock(listen_sock) < 0)
 458                 err(1, "failed to set server socket to non-blocking");
 459
 460         ev_io_init(&ev_accept, accept_cb, listen_sock, EV_READ);
 461 }
 462
 463 /* {{{ proto bool event_set(resource event, resource fd, int events, mixed callback[, mixed arg])
 464  * Taken from pecl::libevent event_set
 465  */
 466 PHP_FUNCTION(mistral_register_callback)
 467 {
 468         zval *zcallback, *zarg = NULL;
 469         php_event_callback_t *new_callback, *old_callback;
 470         char *func_name;
 471
 472         if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z", &zcallback) != SUCCESS) {
 473                 return;
 474         }
 475
 476         if (!zend_is_callable(zcallback, 0, &func_name TSRMLS_CC)) {
 477                 php_error_docref(NULL TSRMLS_CC, E_WARNING, "'%s' is not a valid callback", func_name);
 478                 efree(func_name);
 479                 RETURN_FALSE;
 480         }
 481         efree(func_name);
 482
 483         zval_add_ref(&zcallback);
 484
 485         new_callback = emalloc(sizeof(php_event_callback_t));
 486         new_callback->func = zcallback;
 487         new_callback->arg = zarg;
 488
 489         old_callback = callback;
 490         callback = new_callback;
 491
 492         if (old_callback) {
 493                 _php_event_callback_free(old_callback);
 494         }
 495
 496         RETURN_TRUE;
 497 }
 498 /* }}} */
 499
 500 PHP_FUNCTION(mistral_start)
 501 {
 502         struct ev_loop *loop = ev_default_loop(0);
 503
 504         ev_io_start(loop, &ev_accept);
 505         ev_loop(loop, 0);
 506 }