lib/server.c

   1 /*
   2  * libwebsockets - small server side websockets and web server implementation
   3  *
   4  * Copyright (C) 2010-2016 Andy Green <andy@warmcat.com>
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Lesser General Public
   8  *  License as published by the Free Software Foundation:
   9  *  version 2.1 of the License.
  10  *
  11  *  This library is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Lesser General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Lesser General Public
  17  *  License along with this library; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19  *  MA  02110-1301  USA
  20  */
  21
  22
  23 #include "private-libwebsockets.h"
  24
  25 int
  26 lws_context_init_server(struct lws_context_creation_info *info,
  27                         struct lws_vhost *vhost)
  28 {
  29 #ifdef LWS_POSIX
  30         int n, opt = 1, limit = 1;
  31 #endif
  32         lws_sockfd_type sockfd;
  33         struct lws_vhost *vh;
  34         struct lws *wsi;
  35         int m = 0;
  36
  37         /* set up our external listening socket we serve on */
  38
  39         if (info->port == CONTEXT_PORT_NO_LISTEN)
  40                 return 0;
  41
  42         vh = vhost->context->vhost_list;
  43         while (vh) {
  44                 if (vh->listen_port == info->port) {
  45                         if ((!info->iface && !vh->iface) ||
  46                             (info->iface && vh->iface &&
  47                             !strcmp(info->iface, vh->iface))) {
  48                                 vhost->listen_port = info->port;
  49                                 vhost->iface = info->iface;
  50                                 lwsl_notice(" using listen skt from vhost %s\n",
  51                                             vh->name);
  52                                 return 0;
  53                         }
  54                 }
  55                 vh = vh->vhost_next;
  56         }
  57
  58 #if LWS_POSIX
  59 #if defined(__linux__)
  60         limit = vhost->context->count_threads;
  61 #endif
  62
  63         for (m = 0; m < limit; m++) {
  64 #ifdef LWS_USE_UNIX_SOCK
  65         if (LWS_UNIX_SOCK_ENABLED(vhost))
  66                 sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
  67         else
  68 #endif
  69 #ifdef LWS_USE_IPV6
  70         if (LWS_IPV6_ENABLED(context))
  71                 sockfd = socket(AF_INET6, SOCK_STREAM, 0);
  72         else
  73 #endif
  74                 sockfd = socket(AF_INET, SOCK_STREAM, 0);
  75
  76         if (sockfd == -1) {
  77 #else
  78         sockfd = mbed3_create_tcp_stream_socket();
  79         if (!lws_sockfd_valid(sockfd)) {
  80 #endif
  81                 lwsl_err("ERROR opening socket\n");
  82                 return 1;
  83         }
  84
  85 #if LWS_POSIX
  86         /*
  87          * allow us to restart even if old sockets in TIME_WAIT
  88          */
  89         if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
  90                        (const void *)&opt, sizeof(opt)) < 0) {
  91                 compatible_close(sockfd);
  92                 return 1;
  93         }
  94 #if defined(__linux__) && defined(SO_REUSEPORT) && LWS_MAX_SMP > 1
  95         if (vhost->context->count_threads > 1)
  96                 if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEPORT,
  97                                 (const void *)&opt, sizeof(opt)) < 0) {
  98                         compatible_close(sockfd);
  99                         return 1;
 100                 }
 101 #endif
 102 #endif
 103         lws_plat_set_socket_options(vhost, sockfd);
 104
 105 #if LWS_POSIX
 106         n = lws_socket_bind(vhost, sockfd, info->port, info->iface);
 107         if (n < 0)
 108                 goto bail;
 109         info->port = n;
 110 #endif
 111         vhost->listen_port = info->port;
 112         vhost->iface = info->iface;
 113
 114         wsi = lws_zalloc(sizeof(struct lws));
 115         if (wsi == NULL) {
 116                 lwsl_err("Out of mem\n");
 117                 goto bail;
 118         }
 119         wsi->context = vhost->context;
 120         wsi->sock = sockfd;
 121         wsi->mode = LWSCM_SERVER_LISTENER;
 122         wsi->protocol = vhost->protocols;
 123         wsi->tsi = m;
 124         wsi->vhost = vhost;
 125         wsi->listener = 1;
 126
 127         vhost->context->pt[m].wsi_listening = wsi;
 128         if (insert_wsi_socket_into_fds(vhost->context, wsi))
 129                 goto bail;
 130
 131         vhost->context->count_wsi_allocated++;
 132         vhost->lserv_wsi = wsi;
 133
 134 #if LWS_POSIX
 135         listen(wsi->sock, LWS_SOMAXCONN);
 136         } /* for each thread able to independently listen */
 137 #else
 138         mbed3_tcp_stream_bind(wsi->sock, info->port, wsi);
 139 #endif
 140         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS)) {
 141 #ifdef LWS_USE_UNIX_SOCK
 142                 if (LWS_UNIX_SOCK_ENABLED(vhost))
 143                         lwsl_notice(" Listening on \"%s\"\n", info->iface);
 144                 else
 145 #endif
 146                         lwsl_notice(" Listening on port %d\n", info->port);
 147         }
 148
 149         return 0;
 150
 151 bail:
 152         compatible_close(sockfd);
 153
 154         return 1;
 155 }
 156
 157 int
 158 _lws_server_listen_accept_flow_control(struct lws *twsi, int on)
 159 {
 160         struct lws_context_per_thread *pt = &twsi->context->pt[(int)twsi->tsi];
 161         struct lws *wsi = pt->wsi_listening;
 162         int n;
 163
 164         if (!wsi || twsi->context->being_destroyed)
 165                 return 0;
 166
 167         lwsl_debug("%s: Thr %d: LISTEN wsi %p: state %d\n",
 168                    __func__, twsi->tsi, (void *)wsi, on);
 169
 170         if (on)
 171                 n = lws_change_pollfd(wsi, 0, LWS_POLLIN);
 172         else
 173                 n = lws_change_pollfd(wsi, LWS_POLLIN, 0);
 174
 175         return n;
 176 }
 177
 178 struct lws_vhost *
 179 lws_select_vhost(struct lws_context *context, int port, const char *servername)
 180 {
 181         struct lws_vhost *vhost = context->vhost_list;
 182
 183         while (vhost) {
 184                 if (port == vhost->listen_port &&
 185                     !strcmp(vhost->name, servername)) {
 186                         lwsl_info("SNI: Found: %s\n", servername);
 187                         return vhost;
 188                 }
 189                 vhost = vhost->vhost_next;
 190         }
 191
 192         return NULL;
 193 }
 194
 195 static const char * get_mimetype(const char *file)
 196 {
 197         int n = strlen(file);
 198
 199         if (n < 5)
 200                 return NULL;
 201
 202         if (!strcmp(&file[n - 4], ".ico"))
 203                 return "image/x-icon";
 204
 205         if (!strcmp(&file[n - 4], ".gif"))
 206                 return "image/gif";
 207
 208         if (!strcmp(&file[n - 3], ".js"))
 209                 return "text/javascript";
 210
 211         if (!strcmp(&file[n - 4], ".png"))
 212                 return "image/png";
 213
 214         if (!strcmp(&file[n - 4], ".jpg"))
 215                 return "image/jpeg";
 216
 217         if (!strcmp(&file[n - 5], ".html"))
 218                 return "text/html";
 219
 220         if (!strcmp(&file[n - 4], ".css"))
 221                 return "text/css";
 222
 223         if (!strcmp(&file[n - 4], ".ttf"))
 224                 return "application/x-font-ttf";
 225
 226         return NULL;
 227 }
 228
 229 int lws_http_serve(struct lws *wsi, char *uri, const char *origin)
 230 {
 231         const char *mimetype;
 232         struct stat st;
 233         char path[256], sym[256];
 234         unsigned char *p = (unsigned char *)sym + 32 + LWS_PRE, *start = p;
 235         unsigned char *end = p + sizeof(sym) - 32 - LWS_PRE;
 236         size_t len;
 237         int n, spin = 0;
 238
 239         snprintf(path, sizeof(path) - 1, "%s/%s", origin, uri);
 240
 241         do {
 242                 spin++;
 243
 244                 if (stat(path, &st)) {
 245                         lwsl_err("unable to stat %s\n", path);
 246                         goto bail;
 247                 }
 248
 249                 lwsl_debug(" %s mode %d\n", path, S_IFMT & st.st_mode);
 250 #if !defined(WIN32)
 251                 if ((S_IFMT & st.st_mode) == S_IFLNK) {
 252                         len = readlink(path, sym, sizeof(sym) - 1);
 253                         if (len) {
 254                                 lwsl_err("Failed to read link %s\n", path);
 255                                 goto bail;
 256                         }
 257                         sym[len] = '\0';
 258                         lwsl_debug("symlink %s -> %s\n", path, sym);
 259                         snprintf(path, sizeof(path) - 1, "%s", sym);
 260                 }
 261 #endif
 262                 if ((S_IFMT & st.st_mode) == S_IFDIR) {
 263                         lwsl_debug("default filename append to dir\n");
 264                         snprintf(path, sizeof(path) - 1, "%s/%s/index.html",
 265                                  origin, uri);
 266                 }
 267
 268         } while ((S_IFMT & st.st_mode) != S_IFREG && spin < 5);
 269
 270         if (spin == 5)
 271                 lwsl_err("symlink loop %s \n", path);
 272
 273         n = sprintf(sym, "%08lX%08lX", (unsigned long)st.st_size,
 274                                    (unsigned long)st.st_mtime);
 275
 276         if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_IF_NONE_MATCH)) {
 277                 /*
 278                  * he thinks he has some version of it already,
 279                  * check if the tag matches
 280                  */
 281                 if (!strcmp(sym, lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_IF_NONE_MATCH))) {
 282
 283                         lwsl_debug("%s: ETAG match %s %s\n", __func__,
 284                                    uri, origin);
 285
 286                         /* we don't need to send the payload */
 287                         if (lws_add_http_header_status(wsi, 304, &p, end))
 288                                 return -1;
 289                         if (lws_add_http_header_by_token(wsi,
 290                                         WSI_TOKEN_HTTP_ETAG,
 291                                         (unsigned char *)sym, n, &p, end))
 292                                 return -1;
 293                         if (lws_finalize_http_header(wsi, &p, end))
 294                                 return -1;
 295
 296                         n = lws_write(wsi, start, p - start,
 297                                         LWS_WRITE_HTTP_HEADERS);
 298                         if (n != (p - start)) {
 299                                 lwsl_err("_write returned %d from %d\n", n, p - start);
 300                                 return -1;
 301                         }
 302
 303                         return lws_http_transaction_completed(wsi);
 304                 }
 305         }
 306
 307         if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_ETAG,
 308                         (unsigned char *)sym, n, &p, end))
 309                 return -1;
 310
 311         mimetype = get_mimetype(path);
 312         if (!mimetype) {
 313                 lwsl_err("unknown mimetype for %s", path);
 314                 goto bail;
 315         }
 316
 317         n = lws_serve_http_file(wsi, path, mimetype, (char *)start, p - start);
 318
 319         if (n < 0 || ((n > 0) && lws_http_transaction_completed(wsi)))
 320                 return -1; /* error or can't reuse connection: close the socket */
 321
 322         return 0;
 323 bail:
 324         lws_return_http_status(wsi, HTTP_STATUS_NOT_FOUND, NULL);
 325
 326         return -1;
 327 }
 328
 329 int
 330 lws_http_action(struct lws *wsi)
 331 {
 332         struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
 333         enum http_connection_type connection_type;
 334         enum http_version request_version;
 335         char content_length_str[32];
 336         struct lws_http_mount *hm, *hit = NULL;
 337         unsigned int n, count = 0;
 338         char http_version_str[10];
 339         char http_conn_str[20];
 340         int http_version_len;
 341         char *uri_ptr = NULL;
 342         int uri_len = 0, best = 0;
 343         int meth = -1;
 344
 345         static const unsigned char methods[] = {
 346                 WSI_TOKEN_GET_URI,
 347                 WSI_TOKEN_POST_URI,
 348                 WSI_TOKEN_OPTIONS_URI,
 349                 WSI_TOKEN_PUT_URI,
 350                 WSI_TOKEN_PATCH_URI,
 351                 WSI_TOKEN_DELETE_URI,
 352 #ifdef LWS_USE_HTTP2
 353                 WSI_TOKEN_HTTP_COLON_PATH,
 354 #endif
 355         };
 356 #if defined(_DEBUG) || defined(LWS_WITH_ACCESS_LOG)
 357         static const char * const method_names[] = {
 358                 "GET", "POST", "OPTIONS", "PUT", "PATCH", "DELETE",
 359 #ifdef LWS_USE_HTTP2
 360                 ":path",
 361 #endif
 362         };
 363 #endif
 364
 365         /* it's not websocket.... shall we accept it as http? */
 366
 367         for (n = 0; n < ARRAY_SIZE(methods); n++)
 368                 if (lws_hdr_total_length(wsi, methods[n]))
 369                         count++;
 370         if (!count) {
 371                 lwsl_warn("Missing URI in HTTP request\n");
 372                 goto bail_nuke_ah;
 373         }
 374
 375         if (count != 1) {
 376                 lwsl_warn("multiple methods?\n");
 377                 goto bail_nuke_ah;
 378         }
 379
 380         if (lws_ensure_user_space(wsi))
 381                 goto bail_nuke_ah;
 382
 383         for (n = 0; n < ARRAY_SIZE(methods); n++)
 384                 if (lws_hdr_total_length(wsi, methods[n])) {
 385                         uri_ptr = lws_hdr_simple_ptr(wsi, methods[n]);
 386                         uri_len = lws_hdr_total_length(wsi, methods[n]);
 387                         lwsl_info("Method: %s request for '%s'\n",
 388                                         method_names[n], uri_ptr);
 389                         meth = n;
 390                         break;
 391                 }
 392
 393         (void)meth;
 394
 395         /* we insist on absolute paths */
 396
 397         if (uri_ptr[0] != '/') {
 398                 lws_return_http_status(wsi, HTTP_STATUS_FORBIDDEN, NULL);
 399
 400                 goto bail_nuke_ah;
 401         }
 402
 403         /* HTTP header had a content length? */
 404
 405         wsi->u.http.content_length = 0;
 406         if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI) ||
 407                 lws_hdr_total_length(wsi, WSI_TOKEN_PATCH_URI) ||
 408                 lws_hdr_total_length(wsi, WSI_TOKEN_PUT_URI))
 409                 wsi->u.http.content_length = 100 * 1024 * 1024;
 410
 411         if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_CONTENT_LENGTH)) {
 412                 lws_hdr_copy(wsi, content_length_str,
 413                              sizeof(content_length_str) - 1,
 414                              WSI_TOKEN_HTTP_CONTENT_LENGTH);
 415                 wsi->u.http.content_length = atoi(content_length_str);
 416         }
 417
 418         if (wsi->http2_substream) {
 419                 wsi->u.http.request_version = HTTP_VERSION_2;
 420         } else {
 421                 /* http_version? Default to 1.0, override with token: */
 422                 request_version = HTTP_VERSION_1_0;
 423
 424                 /* Works for single digit HTTP versions. : */
 425                 http_version_len = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP);
 426                 if (http_version_len > 7) {
 427                         lws_hdr_copy(wsi, http_version_str,
 428                                         sizeof(http_version_str) - 1, WSI_TOKEN_HTTP);
 429                         if (http_version_str[5] == '1' && http_version_str[7] == '1')
 430                                 request_version = HTTP_VERSION_1_1;
 431                 }
 432                 wsi->u.http.request_version = request_version;
 433
 434                 /* HTTP/1.1 defaults to "keep-alive", 1.0 to "close" */
 435                 if (request_version == HTTP_VERSION_1_1)
 436                         connection_type = HTTP_CONNECTION_KEEP_ALIVE;
 437                 else
 438                         connection_type = HTTP_CONNECTION_CLOSE;
 439
 440                 /* Override default if http "Connection:" header: */
 441                 if (lws_hdr_total_length(wsi, WSI_TOKEN_CONNECTION)) {
 442                         lws_hdr_copy(wsi, http_conn_str, sizeof(http_conn_str) - 1,
 443                                      WSI_TOKEN_CONNECTION);
 444                         http_conn_str[sizeof(http_conn_str) - 1] = '\0';
 445                         if (!strcasecmp(http_conn_str, "keep-alive"))
 446                                 connection_type = HTTP_CONNECTION_KEEP_ALIVE;
 447                         else
 448                                 if (!strcasecmp(http_conn_str, "close"))
 449                                         connection_type = HTTP_CONNECTION_CLOSE;
 450                 }
 451                 wsi->u.http.connection_type = connection_type;
 452         }
 453
 454         n = wsi->protocol->callback(wsi, LWS_CALLBACK_FILTER_HTTP_CONNECTION,
 455                                     wsi->user_space, uri_ptr, uri_len);
 456         if (n) {
 457                 lwsl_info("LWS_CALLBACK_HTTP closing\n");
 458
 459                 return 1;
 460         }
 461         /*
 462          * if there is content supposed to be coming,
 463          * put a timeout on it having arrived
 464          */
 465         lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT,
 466                         wsi->context->timeout_secs);
 467 #ifdef LWS_OPENSSL_SUPPORT
 468         if (wsi->redirect_to_https) {
 469                 /*
 470                  * we accepted http:// only so we could redirect to
 471                  * https://, so issue the redirect.  Create the redirection
 472                  * URI from the host: header and ignore the path part
 473                  */
 474                 unsigned char *start = pt->serv_buf + LWS_PRE, *p = start,
 475                               *end = p + 512;
 476
 477                 if (!lws_hdr_total_length(wsi, WSI_TOKEN_HOST))
 478                         goto bail_nuke_ah;
 479
 480                 n = sprintf((char *)end, "https://%s/",
 481                             lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST));
 482
 483                 n = lws_http_redirect(wsi, end, n, &p, end);
 484                 if ((int)n < 0)
 485                         goto bail_nuke_ah;
 486
 487                 return lws_http_transaction_completed(wsi);
 488         }
 489 #endif
 490
 491 #ifdef LWS_WITH_ACCESS_LOG
 492         /*
 493          * Produce Apache-compatible log string for wsi, like this:
 494          *
 495          * 2.31.234.19 - - [27/Mar/2016:03:22:44 +0800]
 496          * "GET /aep-screen.png HTTP/1.1"
 497          * 200 152987 "https://libwebsockets.org/index.html"
 498          * "Mozilla/5.0 (Macint... Chrome/49.0.2623.87 Safari/537.36"
 499          *
 500          */
 501         {
 502                 static const char * const hver[] = {
 503                         "http/1.0", "http/1.1", "http/2"
 504                 };
 505 #ifdef LWS_USE_IPV6
 506                 char ads[INET6_ADDRSTRLEN];
 507 #else
 508                 char ads[INET_ADDRSTRLEN];
 509 #endif
 510                 char da[64];
 511                 const char *pa, *me;
 512                 struct tm *tmp;
 513                 time_t t = time(NULL);
 514                 int l = 256;
 515
 516                 if (wsi->access_log_pending)
 517                         lws_access_log(wsi);
 518
 519                 wsi->access_log.header_log = lws_malloc(l);
 520
 521                 tmp = localtime(&t);
 522                 if (tmp)
 523                         strftime(da, sizeof(da), "%d/%b/%Y:%H:%M:%S %z", tmp);
 524                 else
 525                         strcpy(da, "01/Jan/1970:00:00:00 +0000");
 526
 527                 pa = lws_get_peer_simple(wsi, ads, sizeof(ads));
 528                 if (!pa)
 529                         pa = "(unknown)";
 530
 531                 if (meth >= 0)
 532                         me = method_names[meth];
 533                 else
 534                         me = "unknown";
 535
 536                 snprintf(wsi->access_log.header_log, l,
 537                          "%s - - [%s] \"%s %s %s\"",
 538                          pa, da, me, uri_ptr,
 539                          hver[wsi->u.http.request_version]);
 540
 541                 l = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_USER_AGENT);
 542                 if (l) {
 543                         wsi->access_log.user_agent = lws_malloc(l + 2);
 544                         lws_hdr_copy(wsi, wsi->access_log.user_agent,
 545                                      l + 1, WSI_TOKEN_HTTP_USER_AGENT);
 546                 }
 547                 wsi->access_log_pending = 1;
 548         }
 549 #endif
 550
 551         /* can we serve it from the mount list? */
 552
 553         hm = wsi->vhost->mount_list;
 554         while (hm) {
 555                 if (uri_len >= hm->mountpoint_len &&
 556                     !strncmp(uri_ptr, hm->mountpoint, hm->mountpoint_len) &&
 557                     (uri_ptr[hm->mountpoint_len] == '\0' ||
 558                      uri_ptr[hm->mountpoint_len] == '/' ||
 559                      hm->mountpoint_len == 1)
 560                     ) {
 561                         if ((hm->origin_protocol == LWSMPRO_CGI ||
 562                              lws_hdr_total_length(wsi, WSI_TOKEN_GET_URI)) &&
 563                             hm->mountpoint_len > best) {
 564                                 best = hm->mountpoint_len;
 565                                 hit = hm;
 566                         }
 567                 }
 568                 hm = hm->mount_next;
 569         }
 570         if (hit) {
 571                 char *s = uri_ptr + hit->mountpoint_len;
 572
 573                 lwsl_debug("*** hit %d %d %s\n", hit->mountpoint_len,
 574                            hit->origin_protocol , hit->origin);
 575
 576                 /*
 577                  * if we have a mountpoint like https://xxx.com/yyy
 578                  * there is an implied / at the end for our purposes since
 579                  * we can only mount on a "directory".
 580                  *
 581                  * But if we just go with that, the browser cannot understand
 582                  * that he is actually looking down one "directory level", so
 583                  * even though we give him /yyy/abc.html he acts like the
 584                  * current directory level is /.  So relative urls like "x.png"
 585                  * wrongly look outside the mountpoint.
 586                  *
 587                  * Therefore if we didn't come in on a url with an explicit
 588                  * / at the end, we must redirect to add it so the browser
 589                  * understands he is one "directory level" down.
 590                  */
 591                 if ((hit->mountpoint_len > 1 || (hit->origin_protocol & 4)) &&
 592                     (*s != '/' || (hit->origin_protocol & 4)) &&
 593                     (hit->origin_protocol != LWSMPRO_CGI)) {
 594                         unsigned char *start = pt->serv_buf + LWS_PRE,
 595                                               *p = start, *end = p + 512;
 596                         static const char *oprot[] = {
 597                                 "http://", "https://"
 598                         };
 599
 600                         lwsl_debug("Doing 301 '%s' org %s\n", s, hit->origin);
 601
 602                         if (!lws_hdr_total_length(wsi, WSI_TOKEN_HOST))
 603                                 goto bail_nuke_ah;
 604
 605                         /* > at start indicates deal with by redirect */
 606                         if (hit->origin_protocol & 4)
 607                                 n = snprintf((char *)end, 256, "%s%s",
 608                                             oprot[hit->origin_protocol & 1],
 609                                             hit->origin);
 610                         else
 611                                 n = snprintf((char *)end, 256,
 612                                     "https://%s/%s/",
 613                                     lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST),
 614                                     uri_ptr);
 615
 616                         n = lws_http_redirect(wsi, end, n, &p, end);
 617                         if ((int)n < 0)
 618                                 goto bail_nuke_ah;
 619
 620                         return lws_http_transaction_completed(wsi);
 621                 }
 622
 623 #ifdef LWS_WITH_CGI
 624                 /* did we hit something with a cgi:// origin? */
 625                 if (hit->origin_protocol == LWSMPRO_CGI) {
 626                         const char *cmd[] = {
 627                                 NULL, /* replace with cgi path */
 628                                 NULL
 629                         };
 630                         unsigned char *p, *end, buffer[256];
 631
 632                         lwsl_debug("%s: cgi\n", __func__);
 633                         cmd[0] = hit->origin;
 634
 635                         n = 5;
 636                         if (hit->cgi_timeout)
 637                                 n = hit->cgi_timeout;
 638
 639                         n = lws_cgi(wsi, cmd, hit->mountpoint_len, n,
 640                                     hit->cgienv);
 641                         if (n) {
 642                                 lwsl_err("%s: cgi failed\n");
 643                                 return -1;
 644                         }
 645                         p = buffer + LWS_PRE;
 646                         end = p + sizeof(buffer) - LWS_PRE;
 647
 648                         if (lws_add_http_header_status(wsi, 200, &p, end))
 649                                 return 1;
 650                         if (lws_add_http_header_by_token(wsi, WSI_TOKEN_CONNECTION,
 651                                         (unsigned char *)"close", 5, &p, end))
 652                                 return 1;
 653                         n = lws_write(wsi, buffer + LWS_PRE,
 654                                       p - (buffer + LWS_PRE),
 655                                       LWS_WRITE_HTTP_HEADERS);
 656
 657                         goto deal_body;
 658                 }
 659 #endif
 660
 661                 n = strlen(s);
 662                 if (s[0] == '\0' || (n == 1 && s[n - 1] == '/'))
 663                         s = (char *)hit->def;
 664                 if (!s)
 665                         s = "index.html";
 666
 667                 wsi->cache_secs = hit->cache_max_age;
 668                 wsi->cache_reuse = hit->cache_reusable;
 669                 wsi->cache_revalidate = hit->cache_revalidate;
 670                 wsi->cache_intermediaries = hit->cache_intermediaries;
 671
 672                 n = lws_http_serve(wsi, s, hit->origin);
 673         } else
 674                 n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP,
 675                                     wsi->user_space, uri_ptr, uri_len);
 676
 677         if (n) {
 678                 lwsl_info("LWS_CALLBACK_HTTP closing\n");
 679
 680                 return 1;
 681         }
 682
 683 #ifdef LWS_WITH_CGI
 684 deal_body:
 685 #endif
 686         /*
 687          * If we're not issuing a file, check for content_length or
 688          * HTTP keep-alive. No keep-alive header allocation for
 689          * ISSUING_FILE, as this uses HTTP/1.0.
 690          *
 691          * In any case, return 0 and let lws_read decide how to
 692          * proceed based on state
 693          */
 694         if (wsi->state != LWSS_HTTP_ISSUING_FILE)
 695                 /* Prepare to read body if we have a content length: */
 696                 if (wsi->u.http.content_length > 0)
 697                         wsi->state = LWSS_HTTP_BODY;
 698
 699         return 0;
 700
 701 bail_nuke_ah:
 702         /* we're closing, losing some rx is OK */
 703         wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
 704         lws_header_table_detach(wsi, 1);
 705
 706         return 1;
 707 }
 708
 709
 710 int
 711 lws_handshake_server(struct lws *wsi, unsigned char **buf, size_t len)
 712 {
 713         struct lws_context *context = lws_get_context(wsi);
 714         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 715         struct _lws_header_related hdr;
 716         struct allocated_headers *ah;
 717         int protocol_len, n, hit;
 718         char protocol_list[128];
 719         char protocol_name[32];
 720         char *p;
 721
 722         assert(len < 10000000);
 723         assert(wsi->u.hdr.ah);
 724
 725         while (len--) {
 726                 wsi->more_rx_waiting = !!len;
 727
 728                 if (wsi->mode != LWSCM_HTTP_SERVING &&
 729                     wsi->mode != LWSCM_HTTP_SERVING_ACCEPTED) {
 730                         lwsl_err("%s: bad wsi mode %d\n", __func__, wsi->mode);
 731                         goto bail_nuke_ah;
 732                 }
 733
 734                 if (lws_parse(wsi, *(*buf)++)) {
 735                         lwsl_info("lws_parse failed\n");
 736                         goto bail_nuke_ah;
 737                 }
 738
 739                 if (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE)
 740                         continue;
 741
 742                 lwsl_parser("%s: lws_parse sees parsing complete\n", __func__);
 743                 lwsl_debug("%s: wsi->more_rx_waiting=%d\n", __func__,
 744                                 wsi->more_rx_waiting);
 745
 746                 /* select vhost */
 747
 748                 if (lws_hdr_total_length(wsi, WSI_TOKEN_HOST)) {
 749                         struct lws_vhost *vhost = lws_select_vhost(
 750                                 context, wsi->vhost->listen_port,
 751                                 lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST));
 752
 753                         if (vhost)
 754                                 wsi->vhost = vhost;
 755                 }
 756
 757                 wsi->vhost->trans++;
 758                 if (!wsi->conn_stat_done) {
 759                         wsi->vhost->conn++;
 760                         wsi->conn_stat_done = 1;
 761                 }
 762
 763                 wsi->mode = LWSCM_PRE_WS_SERVING_ACCEPT;
 764                 lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
 765
 766                 /* is this websocket protocol or normal http 1.0? */
 767
 768                 if (lws_hdr_total_length(wsi, WSI_TOKEN_UPGRADE)) {
 769                         if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
 770                                         "websocket")) {
 771                                 wsi->vhost->ws_upgrades++;
 772                                 lwsl_info("Upgrade to ws\n");
 773                                 goto upgrade_ws;
 774                         }
 775 #ifdef LWS_USE_HTTP2
 776                         if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
 777                                         "h2c")) {
 778                                 wsi->vhost->http2_upgrades++;
 779                                 lwsl_info("Upgrade to h2c\n");
 780                                 goto upgrade_h2c;
 781                         }
 782 #endif
 783                         lwsl_err("Unknown upgrade\n");
 784                         /* dunno what he wanted to upgrade to */
 785                         goto bail_nuke_ah;
 786                 }
 787
 788                 /* no upgrade ack... he remained as HTTP */
 789
 790                 lwsl_info("No upgrade\n");
 791                 ah = wsi->u.hdr.ah;
 792
 793                 lws_union_transition(wsi, LWSCM_HTTP_SERVING_ACCEPTED);
 794                 wsi->state = LWSS_HTTP;
 795                 wsi->u.http.fd = LWS_INVALID_FILE;
 796
 797                 /* expose it at the same offset as u.hdr */
 798                 wsi->u.http.ah = ah;
 799                 lwsl_debug("%s: wsi %p: ah %p\n", __func__, (void *)wsi,
 800                            (void *)wsi->u.hdr.ah);
 801
 802                 n = lws_http_action(wsi);
 803
 804                 return n;
 805
 806 #ifdef LWS_USE_HTTP2
 807 upgrade_h2c:
 808                 if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP2_SETTINGS)) {
 809                         lwsl_err("missing http2_settings\n");
 810                         goto bail_nuke_ah;
 811                 }
 812
 813                 lwsl_err("h2c upgrade...\n");
 814
 815                 p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP2_SETTINGS);
 816                 /* convert the peer's HTTP-Settings */
 817                 n = lws_b64_decode_string(p, protocol_list,
 818                                           sizeof(protocol_list));
 819                 if (n < 0) {
 820                         lwsl_parser("HTTP2_SETTINGS too long\n");
 821                         return 1;
 822                 }
 823
 824                 /* adopt the header info */
 825
 826                 ah = wsi->u.hdr.ah;
 827
 828                 lws_union_transition(wsi, LWSCM_HTTP2_SERVING);
 829
 830                 /* http2 union member has http union struct at start */
 831                 wsi->u.http.ah = ah;
 832
 833                 lws_http2_init(&wsi->u.http2.peer_settings);
 834                 lws_http2_init(&wsi->u.http2.my_settings);
 835
 836                 /* HTTP2 union */
 837
 838                 lws_http2_interpret_settings_payload(&wsi->u.http2.peer_settings,
 839                                 (unsigned char *)protocol_list, n);
 840
 841                 strcpy(protocol_list,
 842                        "HTTP/1.1 101 Switching Protocols\x0d\x0a"
 843                       "Connection: Upgrade\x0d\x0a"
 844                       "Upgrade: h2c\x0d\x0a\x0d\x0a");
 845                 n = lws_issue_raw(wsi, (unsigned char *)protocol_list,
 846                                         strlen(protocol_list));
 847                 if (n != strlen(protocol_list)) {
 848                         lwsl_debug("http2 switch: ERROR writing to socket\n");
 849                         return 1;
 850                 }
 851
 852                 wsi->state = LWSS_HTTP2_AWAIT_CLIENT_PREFACE;
 853
 854                 return 0;
 855 #endif
 856
 857 upgrade_ws:
 858                 if (!wsi->protocol)
 859                         lwsl_err("NULL protocol at lws_read\n");
 860
 861                 /*
 862                  * It's websocket
 863                  *
 864                  * Select the first protocol we support from the list
 865                  * the client sent us.
 866                  *
 867                  * Copy it to remove header fragmentation
 868                  */
 869
 870                 if (lws_hdr_copy(wsi, protocol_list, sizeof(protocol_list) - 1,
 871                                  WSI_TOKEN_PROTOCOL) < 0) {
 872                         lwsl_err("protocol list too long");
 873                         goto bail_nuke_ah;
 874                 }
 875
 876                 protocol_len = lws_hdr_total_length(wsi, WSI_TOKEN_PROTOCOL);
 877                 protocol_list[protocol_len] = '\0';
 878                 p = protocol_list;
 879                 hit = 0;
 880
 881                 while (*p && !hit) {
 882                         n = 0;
 883                         while (n < sizeof(protocol_name) - 1 && *p && *p !=',')
 884                                 protocol_name[n++] = *p++;
 885                         protocol_name[n] = '\0';
 886                         if (*p)
 887                                 p++;
 888
 889                         lwsl_info("checking %s\n", protocol_name);
 890
 891                         n = 0;
 892                         while (wsi->vhost->protocols[n].callback) {
 893                                 if (wsi->vhost->protocols[n].name &&
 894                                     !strcmp(wsi->vhost->protocols[n].name,
 895                                             protocol_name)) {
 896                                         wsi->protocol = &wsi->vhost->protocols[n];
 897                                         hit = 1;
 898                                         break;
 899                                 }
 900
 901                                 n++;
 902                         }
 903                 }
 904
 905                 /* we didn't find a protocol he wanted? */
 906
 907                 if (!hit) {
 908                         if (lws_hdr_simple_ptr(wsi, WSI_TOKEN_PROTOCOL)) {
 909                                 lwsl_err("No protocol from \"%s\" supported\n",
 910                                          protocol_list);
 911                                 goto bail_nuke_ah;
 912                         }
 913                         /*
 914                          * some clients only have one protocol and
 915                          * do not send the protocol list header...
 916                          * allow it and match to protocol 0
 917                          */
 918                         lwsl_info("defaulting to prot 0 handler\n");
 919                         n = 0;
 920                         wsi->protocol = &wsi->vhost->protocols[0];
 921                 }
 922
 923                 /* allocate wsi->user storage */
 924                 if (lws_ensure_user_space(wsi))
 925                         goto bail_nuke_ah;
 926
 927                 /*
 928                  * Give the user code a chance to study the request and
 929                  * have the opportunity to deny it
 930                  */
 931                 if ((wsi->protocol->callback)(wsi,
 932                                 LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION,
 933                                 wsi->user_space,
 934                               lws_hdr_simple_ptr(wsi, WSI_TOKEN_PROTOCOL), 0)) {
 935                         lwsl_warn("User code denied connection\n");
 936                         goto bail_nuke_ah;
 937                 }
 938
 939                 /*
 940                  * Perform the handshake according to the protocol version the
 941                  * client announced
 942                  */
 943
 944                 switch (wsi->ietf_spec_revision) {
 945                 case 13:
 946                         lwsl_parser("lws_parse calling handshake_04\n");
 947                         if (handshake_0405(context, wsi)) {
 948                                 lwsl_info("hs0405 has failed the connection\n");
 949                                 goto bail_nuke_ah;
 950                         }
 951                         break;
 952
 953                 default:
 954                         lwsl_warn("Unknown client spec version %d\n",
 955                                   wsi->ietf_spec_revision);
 956                         goto bail_nuke_ah;
 957                 }
 958
 959                 /*
 960                  * stitch protocol choice into the vh protocol linked list
 961                  * We always insert ourselves at the start of the list
 962                  *
 963                  * X <-> B
 964                  * X <-> pAn <-> pB
 965                  */
 966                 //lwsl_err("%s: pre insert vhost start wsi %p, that wsi prev == %p\n",
 967                 //              __func__,
 968                 //              wsi->vhost->same_vh_protocol_list[n],
 969                 //              wsi->same_vh_protocol_prev);
 970                 wsi->same_vh_protocol_prev = /* guy who points to us */
 971                         &wsi->vhost->same_vh_protocol_list[n];
 972                 wsi->same_vh_protocol_next = /* old first guy is our next */
 973                                 wsi->vhost->same_vh_protocol_list[n];
 974                 /* we become the new first guy */
 975                 wsi->vhost->same_vh_protocol_list[n] = wsi;
 976
 977                 if (wsi->same_vh_protocol_next)
 978                         /* old first guy points back to us now */
 979                         wsi->same_vh_protocol_next->same_vh_protocol_prev =
 980                                         &wsi->same_vh_protocol_next;
 981
 982
 983
 984                 /* we are upgrading to ws, so http/1.1 and keepalive +
 985                  * pipelined header considerations about keeping the ah around
 986                  * no longer apply.  However it's common for the first ws
 987                  * protocol data to have been coalesced with the browser
 988                  * upgrade request and to already be in the ah rx buffer.
 989                  */
 990
 991                 lwsl_info("%s: %p: inheriting ah in ws mode (rxpos:%d, rxlen:%d)\n",
 992                           __func__, wsi, wsi->u.hdr.ah->rxpos,
 993                           wsi->u.hdr.ah->rxlen);
 994                 lws_pt_lock(pt);
 995                 hdr = wsi->u.hdr;
 996
 997                 lws_union_transition(wsi, LWSCM_WS_SERVING);
 998                 /*
 999                  * first service is WS mode will notice this, use the RX and
1000                  * then detach the ah (caution: we are not in u.hdr union
1001                  * mode any more then... ah_temp member is at start the same
1002                  * though)
1003                  *
1004                  * Because rxpos/rxlen shows something in the ah, we will get
1005                  * service guaranteed next time around the event loop
1006                  *
1007                  * All union members begin with hdr, so we can use it even
1008                  * though we transitioned to ws union mode (the ah detach
1009                  * code uses it anyway).
1010                  */
1011                 wsi->u.hdr = hdr;
1012                 lws_pt_unlock(pt);
1013
1014                 /*
1015                  * create the frame buffer for this connection according to the
1016                  * size mentioned in the protocol definition.  If 0 there, use
1017                  * a big default for compatibility
1018                  */
1019
1020                 n = wsi->protocol->rx_buffer_size;
1021                 if (!n)
1022                         n = LWS_MAX_SOCKET_IO_BUF;
1023                 n += LWS_PRE;
1024                 wsi->u.ws.rx_ubuf = lws_malloc(n + 4 /* 0x0000ffff zlib */);
1025                 if (!wsi->u.ws.rx_ubuf) {
1026                         lwsl_err("Out of Mem allocating rx buffer %d\n", n);
1027                         return 1;
1028                 }
1029                 wsi->u.ws.rx_ubuf_alloc = n;
1030                 lwsl_info("Allocating RX buffer %d\n", n);
1031 #if LWS_POSIX
1032                 if (setsockopt(wsi->sock, SOL_SOCKET, SO_SNDBUF,
1033                                (const char *)&n, sizeof n)) {
1034                         lwsl_warn("Failed to set SNDBUF to %d", n);
1035                         return 1;
1036                 }
1037 #endif
1038                 lwsl_parser("accepted v%02d connection\n",
1039                             wsi->ietf_spec_revision);
1040
1041                 return 0;
1042         } /* while all chars are handled */
1043
1044         return 0;
1045
1046 bail_nuke_ah:
1047         /* drop the header info */
1048         /* we're closing, losing some rx is OK */
1049         wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
1050         lws_header_table_detach(wsi, 1);
1051
1052         return 1;
1053 }
1054
1055 static int
1056 lws_get_idlest_tsi(struct lws_context *context)
1057 {
1058         unsigned int lowest = ~0;
1059         int n = 0, hit = -1;
1060
1061         for (; n < context->count_threads; n++) {
1062                 if ((unsigned int)context->pt[n].fds_count !=
1063                     context->fd_limit_per_thread - 1 &&
1064                     (unsigned int)context->pt[n].fds_count < lowest) {
1065                         lowest = context->pt[n].fds_count;
1066                         hit = n;
1067                 }
1068         }
1069
1070         return hit;
1071 }
1072
1073 struct lws *
1074 lws_create_new_server_wsi(struct lws_vhost *vhost)
1075 {
1076         struct lws *new_wsi;
1077         int n = lws_get_idlest_tsi(vhost->context);
1078
1079         if (n < 0) {
1080                 lwsl_err("no space for new conn\n");
1081                 return NULL;
1082         }
1083
1084         new_wsi = lws_zalloc(sizeof(struct lws));
1085         if (new_wsi == NULL) {
1086                 lwsl_err("Out of memory for new connection\n");
1087                 return NULL;
1088         }
1089
1090         new_wsi->tsi = n;
1091         lwsl_info("Accepted %p to tsi %d\n", new_wsi, new_wsi->tsi);
1092
1093         new_wsi->vhost = vhost;
1094         new_wsi->context = vhost->context;
1095         new_wsi->pending_timeout = NO_PENDING_TIMEOUT;
1096         new_wsi->rxflow_change_to = LWS_RXFLOW_ALLOW;
1097
1098         /* intialize the instance struct */
1099
1100         new_wsi->state = LWSS_HTTP;
1101         new_wsi->mode = LWSCM_HTTP_SERVING;
1102         new_wsi->hdr_parsing_completed = 0;
1103
1104 #ifdef LWS_OPENSSL_SUPPORT
1105         new_wsi->use_ssl = LWS_SSL_ENABLED(vhost);
1106 #endif
1107
1108         /*
1109          * these can only be set once the protocol is known
1110          * we set an unestablished connection's protocol pointer
1111          * to the start of the supported list, so it can look
1112          * for matching ones during the handshake
1113          */
1114         new_wsi->protocol = vhost->protocols;
1115         new_wsi->user_space = NULL;
1116         new_wsi->ietf_spec_revision = 0;
1117         new_wsi->sock = LWS_SOCK_INVALID;
1118         vhost->context->count_wsi_allocated++;
1119
1120         /*
1121          * outermost create notification for wsi
1122          * no user_space because no protocol selection
1123          */
1124         vhost->protocols[0].callback(new_wsi, LWS_CALLBACK_WSI_CREATE,
1125                                        NULL, NULL, 0);
1126
1127         return new_wsi;
1128 }
1129
1130 /**
1131  * lws_http_transaction_completed() - wait for new http transaction or close
1132  * @wsi:        websocket connection
1133  *
1134  *      Returns 1 if the HTTP connection must close now
1135  *      Returns 0 and resets connection to wait for new HTTP header /
1136  *        transaction if possible
1137  */
1138
1139 LWS_VISIBLE int LWS_WARN_UNUSED_RESULT
1140 lws_http_transaction_completed(struct lws *wsi)
1141 {
1142         int n = NO_PENDING_TIMEOUT;
1143
1144         lws_access_log(wsi);
1145
1146         lwsl_debug("%s: wsi %p\n", __func__, wsi);
1147         /* if we can't go back to accept new headers, drop the connection */
1148         if (wsi->u.http.connection_type != HTTP_CONNECTION_KEEP_ALIVE) {
1149                 lwsl_info("%s: %p: close connection\n", __func__, wsi);
1150                 return 1;
1151         }
1152
1153         /* otherwise set ourselves up ready to go again */
1154         wsi->state = LWSS_HTTP;
1155         wsi->mode = LWSCM_HTTP_SERVING;
1156         wsi->u.http.content_length = 0;
1157         wsi->hdr_parsing_completed = 0;
1158 #ifdef LWS_WITH_ACCESS_LOG
1159         wsi->access_log.sent = 0;
1160 #endif
1161
1162         if (wsi->vhost->keepalive_timeout)
1163                 n = PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE;
1164         lws_set_timeout(wsi, n, wsi->vhost->keepalive_timeout);
1165
1166         /*
1167          * We already know we are on http1.1 / keepalive and the next thing
1168          * coming will be another header set.
1169          *
1170          * If there is no pending rx and we still have the ah, drop it and
1171          * reacquire a new ah when the new headers start to arrive.  (Otherwise
1172          * we needlessly hog an ah indefinitely.)
1173          *
1174          * However if there is pending rx and we know from the keepalive state
1175          * that is already at least the start of another header set, simply
1176          * reset the existing header table and keep it.
1177          */
1178         if (wsi->u.hdr.ah) {
1179                 lwsl_info("%s: wsi->more_rx_waiting=%d\n", __func__,
1180                                 wsi->more_rx_waiting);
1181
1182                 if (!wsi->more_rx_waiting) {
1183                         wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
1184                         lws_header_table_detach(wsi, 1);
1185                 } else
1186                         lws_header_table_reset(wsi, 1);
1187         }
1188
1189         /* If we're (re)starting on headers, need other implied init */
1190         wsi->u.hdr.ues = URIES_IDLE;
1191
1192         lwsl_info("%s: %p: keep-alive await new transaction\n", __func__, wsi);
1193
1194         return 0;
1195 }
1196
1197 static struct lws *
1198 lws_adopt_socket_vhost(struct lws_vhost *vh, lws_sockfd_type accept_fd)
1199 {
1200         struct lws_context *context = vh->context;
1201         struct lws *new_wsi = lws_create_new_server_wsi(vh);
1202
1203         if (!new_wsi) {
1204                 compatible_close(accept_fd);
1205                 return NULL;
1206         }
1207
1208         lwsl_info("%s: new wsi %p, sockfd %d\n", __func__, new_wsi, accept_fd);
1209
1210         new_wsi->sock = accept_fd;
1211
1212         /* the transport is accepted... give him time to negotiate */
1213         lws_set_timeout(new_wsi, PENDING_TIMEOUT_ESTABLISH_WITH_SERVER,
1214                         context->timeout_secs);
1215
1216 #if LWS_POSIX == 0
1217         mbed3_tcp_stream_accept(accept_fd, new_wsi);
1218 #endif
1219
1220         /*
1221          * A new connection was accepted. Give the user a chance to
1222          * set properties of the newly created wsi. There's no protocol
1223          * selected yet so we issue this to protocols[0]
1224          */
1225         if ((context->vhost_list->protocols[0].callback)(new_wsi,
1226              LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED, NULL, NULL, 0)) {
1227                 compatible_close(new_wsi->sock);
1228                 lws_free(new_wsi);
1229                 return NULL;
1230         }
1231
1232         lws_libev_accept(new_wsi, new_wsi->sock);
1233         lws_libuv_accept(new_wsi, new_wsi->sock);
1234
1235         if (!LWS_SSL_ENABLED(new_wsi->vhost)) {
1236                 if (insert_wsi_socket_into_fds(context, new_wsi)) {
1237                         lwsl_err("%s: fail inserting socket\n", __func__);
1238                         goto fail;
1239                 }
1240         } else {
1241                 new_wsi->mode = LWSCM_SSL_INIT;
1242                 if (lws_server_socket_service_ssl(new_wsi, accept_fd)) {
1243                         lwsl_err("%s: fail ssl negotiation\n", __func__);
1244                         goto fail;
1245                 }
1246         }
1247
1248         if (!lws_header_table_attach(new_wsi, 0))
1249                 lwsl_debug("Attached ah immediately\n");
1250
1251         return new_wsi;
1252
1253 fail:
1254         lws_close_free_wsi(new_wsi, LWS_CLOSE_STATUS_NOSTATUS);
1255
1256         return NULL;
1257 }
1258
1259 /**
1260  * lws_adopt_socket() - adopt foreign socket as if listen socket accepted it
1261  * @context: lws context
1262  * @accept_fd: fd of already-accepted socket to adopt
1263  *
1264  * Either returns new wsi bound to accept_fd, or closes accept_fd and
1265  * returns NULL, having cleaned up any new wsi pieces.
1266  *
1267  * LWS adopts the socket in http serving mode, it's ready to accept an upgrade
1268  * to ws or just serve http.
1269  */
1270
1271 LWS_VISIBLE struct lws *
1272 lws_adopt_socket(struct lws_context *context, lws_sockfd_type accept_fd)
1273 {
1274         return lws_adopt_socket_vhost(context->vhost_list, accept_fd);
1275 }
1276
1277
1278 /**
1279  * lws_adopt_socket_readbuf() - adopt foreign socket and first rx as if listen socket accepted it
1280  * @context:    lws context
1281  * @accept_fd:  fd of already-accepted socket to adopt
1282  * @readbuf:    NULL or pointer to data that must be drained before reading from
1283  *              accept_fd
1284  * @len:        The length of the data held at @readbuf
1285  *
1286  * Either returns new wsi bound to accept_fd, or closes accept_fd and
1287  * returns NULL, having cleaned up any new wsi pieces.
1288  *
1289  * LWS adopts the socket in http serving mode, it's ready to accept an upgrade
1290  * to ws or just serve http.
1291  *
1292  * If your external code did not already read from the socket, you can use
1293  * lws_adopt_socket() instead.
1294  *
1295  * This api is guaranteed to use the data at @readbuf first, before reading from
1296  * the socket.
1297  *
1298  * @readbuf is limited to the size of the ah rx buf, currently 2048 bytes.
1299  */
1300
1301 LWS_VISIBLE LWS_EXTERN struct lws *
1302 lws_adopt_socket_readbuf(struct lws_context *context, lws_sockfd_type accept_fd,
1303                          const char *readbuf, size_t len)
1304 {
1305         struct lws *wsi = lws_adopt_socket(context, accept_fd);
1306         struct lws_context_per_thread *pt;
1307         struct allocated_headers *ah;
1308         struct lws_pollfd *pfd;
1309
1310         if (!wsi)
1311                 return NULL;
1312
1313         if (!readbuf)
1314                 return wsi;
1315
1316         if (len > sizeof(ah->rx)) {
1317                 lwsl_err("%s: rx in too big\n", __func__);
1318                 goto bail;
1319         }
1320         /*
1321          * we can't process the initial read data until we can attach an ah.
1322          *
1323          * if one is available, get it and place the data in his ah rxbuf...
1324          * wsi with ah that have pending rxbuf get auto-POLLIN service.
1325          *
1326          * no autoservice because we didn't get a chance to attach the
1327          * readbuf data to wsi or ah yet, and we will do it next if we get
1328          * the ah.
1329          */
1330         if (wsi->u.hdr.ah || !lws_header_table_attach(wsi, 0)) {
1331                 ah = wsi->u.hdr.ah;
1332                 memcpy(ah->rx, readbuf, len);
1333                 ah->rxpos = 0;
1334                 ah->rxlen = len;
1335
1336                 lwsl_notice("%s: calling service on readbuf ah\n", __func__);
1337                 pt = &context->pt[(int)wsi->tsi];
1338
1339                 /* unlike a normal connect, we have the headers already
1340                  * (or the first part of them anyway).
1341                  * libuv won't come back and service us without a network
1342                  * event, so we need to do the header service right here.
1343                  */
1344                 pfd = &pt->fds[wsi->position_in_fds_table];
1345                 pfd->revents |= LWS_POLLIN;
1346                 lwsl_err("%s: calling service\n", __func__);
1347                 if (lws_service_fd_tsi(context, pfd, wsi->tsi))
1348                         /* service closed us */
1349                         return NULL;
1350
1351                 return wsi;
1352         }
1353         lwsl_err("%s: deferring handling ah\n", __func__);
1354         /*
1355          * hum if no ah came, we are on the wait list and must defer
1356          * dealing with this until the ah arrives.
1357          *
1358          * later successful lws_header_table_attach() will apply the
1359          * below to the rx buffer (via lws_header_table_reset()).
1360          */
1361         wsi->u.hdr.preamble_rx = lws_malloc(len);
1362         memcpy(wsi->u.hdr.preamble_rx, readbuf, len);
1363         wsi->u.hdr.preamble_rx_len = len;
1364
1365         return wsi;
1366
1367 bail:
1368         lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
1369
1370         return NULL;
1371 }
1372
1373 LWS_VISIBLE int
1374 lws_server_socket_service(struct lws_context *context, struct lws *wsi,
1375                           struct lws_pollfd *pollfd)
1376 {
1377         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
1378         lws_sockfd_type accept_fd = LWS_SOCK_INVALID;
1379         struct allocated_headers *ah;
1380 #if LWS_POSIX
1381         struct sockaddr_in cli_addr;
1382         socklen_t clilen;
1383 #endif
1384         int n, len;
1385
1386         switch (wsi->mode) {
1387
1388         case LWSCM_HTTP_SERVING:
1389         case LWSCM_HTTP_SERVING_ACCEPTED:
1390         case LWSCM_HTTP2_SERVING:
1391
1392                 /* handle http headers coming in */
1393
1394                 /* pending truncated sends have uber priority */
1395
1396                 if (wsi->trunc_len) {
1397                         if (!(pollfd->revents & LWS_POLLOUT))
1398                                 break;
1399
1400                         if (lws_issue_raw(wsi, wsi->trunc_alloc +
1401                                                wsi->trunc_offset,
1402                                           wsi->trunc_len) < 0)
1403                                 goto fail;
1404                         /*
1405                          * we can't afford to allow input processing to send
1406                          * something new, so spin around he event loop until
1407                          * he doesn't have any partials
1408                          */
1409                         break;
1410                 }
1411
1412                 /* any incoming data ready? */
1413
1414                 if (!(pollfd->revents & pollfd->events & LWS_POLLIN))
1415                         goto try_pollout;
1416
1417                 /* these states imply we MUST have an ah attached */
1418
1419                 if (wsi->state == LWSS_HTTP ||
1420                     wsi->state == LWSS_HTTP_ISSUING_FILE ||
1421                     wsi->state == LWSS_HTTP_HEADERS) {
1422                         if (!wsi->u.hdr.ah)
1423                                 /* no autoservice beacuse we will do it next */
1424                                 if (lws_header_table_attach(wsi, 0))
1425                                         goto try_pollout;
1426
1427                         ah = wsi->u.hdr.ah;
1428
1429                         lwsl_debug("%s: %p: rxpos:%d rxlen:%d\n", __func__, wsi,
1430                                    ah->rxpos, ah->rxlen);
1431
1432                         /* if nothing in ah rx buffer, get some fresh rx */
1433                         if (ah->rxpos == ah->rxlen) {
1434                                 ah->rxlen = lws_ssl_capable_read(wsi, ah->rx,
1435                                                    sizeof(ah->rx));
1436                                 ah->rxpos = 0;
1437                                 lwsl_debug("%s: wsi %p, ah->rxlen = %d\r\n",
1438                                            __func__, wsi, ah->rxlen);
1439                                 switch (ah->rxlen) {
1440                                 case 0:
1441                                         lwsl_info("%s: read 0 len\n", __func__);
1442                                         /* lwsl_info("   state=%d\n", wsi->state); */
1443 //                                      if (!wsi->hdr_parsing_completed)
1444 //                                              lws_header_table_detach(wsi);
1445                                         /* fallthru */
1446                                 case LWS_SSL_CAPABLE_ERROR:
1447                                         goto fail;
1448                                 case LWS_SSL_CAPABLE_MORE_SERVICE:
1449                                         ah->rxlen = ah->rxpos = 0;
1450                                         goto try_pollout;
1451                                 }
1452                         }
1453                         assert(ah->rxpos != ah->rxlen && ah->rxlen);
1454                         /* just ignore incoming if waiting for close */
1455                         if (wsi->state != LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE) {
1456                                 n = lws_read(wsi, ah->rx + ah->rxpos,
1457                                              ah->rxlen - ah->rxpos);
1458                                 if (n < 0) /* we closed wsi */
1459                                         return 1;
1460                                 if (wsi->u.hdr.ah) {
1461                                         if ( wsi->u.hdr.ah->rxlen)
1462                                                  wsi->u.hdr.ah->rxpos += n;
1463
1464                                         if (wsi->u.hdr.ah->rxpos == wsi->u.hdr.ah->rxlen &&
1465                                             (wsi->mode != LWSCM_HTTP_SERVING &&
1466                                              wsi->mode != LWSCM_HTTP_SERVING_ACCEPTED &&
1467                                              wsi->mode != LWSCM_HTTP2_SERVING))
1468                                                 lws_header_table_detach(wsi, 1);
1469                                 }
1470                                 break;
1471                         }
1472
1473                         goto try_pollout;
1474                 }
1475
1476                 len = lws_ssl_capable_read(wsi, pt->serv_buf,
1477                                            LWS_MAX_SOCKET_IO_BUF);
1478                 lwsl_debug("%s: wsi %p read %d\r\n", __func__, wsi, len);
1479                 switch (len) {
1480                 case 0:
1481                         lwsl_info("%s: read 0 len\n", __func__);
1482                         /* lwsl_info("   state=%d\n", wsi->state); */
1483 //                      if (!wsi->hdr_parsing_completed)
1484 //                              lws_header_table_detach(wsi);
1485                         /* fallthru */
1486                 case LWS_SSL_CAPABLE_ERROR:
1487                         goto fail;
1488                 case LWS_SSL_CAPABLE_MORE_SERVICE:
1489                         goto try_pollout;
1490                 }
1491
1492                 /* just ignore incoming if waiting for close */
1493                 if (wsi->state != LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE) {
1494                         /*
1495                          * hm this may want to send
1496                          * (via HTTP callback for example)
1497                          */
1498                         n = lws_read(wsi, pt->serv_buf, len);
1499                         if (n < 0) /* we closed wsi */
1500                                 return 1;
1501                         /* hum he may have used up the
1502                          * writability above */
1503                         break;
1504                 }
1505
1506 try_pollout:
1507                 /* this handles POLLOUT for http serving fragments */
1508
1509                 if (!(pollfd->revents & LWS_POLLOUT))
1510                         break;
1511
1512                 /* one shot */
1513                 if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
1514                         lwsl_notice("%s a\n", __func__);
1515                         goto fail;
1516                 }
1517
1518                 if (!wsi->hdr_parsing_completed)
1519                         break;
1520
1521                 if (wsi->state != LWSS_HTTP_ISSUING_FILE) {
1522                         n = user_callback_handle_rxflow(wsi->protocol->callback,
1523                                         wsi, LWS_CALLBACK_HTTP_WRITEABLE,
1524                                         wsi->user_space, NULL, 0);
1525                         if (n < 0) {
1526                                 lwsl_info("writeable_fail\n");
1527                                 goto fail;
1528                         }
1529                         break;
1530                 }
1531
1532                 /* >0 == completion, <0 == error */
1533                 n = lws_serve_http_file_fragment(wsi);
1534                 if (n < 0 || (n > 0 && lws_http_transaction_completed(wsi))) {
1535                         lwsl_info("completed\n");
1536                         goto fail;
1537                 }
1538                 break;
1539
1540         case LWSCM_SERVER_LISTENER:
1541
1542 #if LWS_POSIX
1543                 /* pollin means a client has connected to us then */
1544
1545                 do {
1546                         if (!(pollfd->revents & LWS_POLLIN) || !(pollfd->events & LWS_POLLIN))
1547                                 break;
1548
1549                         /* listen socket got an unencrypted connection... */
1550
1551                         clilen = sizeof(cli_addr);
1552                         lws_latency_pre(context, wsi);
1553                         accept_fd  = accept(pollfd->fd, (struct sockaddr *)&cli_addr,
1554                                             &clilen);
1555                         lws_latency(context, wsi, "listener accept", accept_fd,
1556                                     accept_fd >= 0);
1557                         if (accept_fd < 0) {
1558                                 if (LWS_ERRNO == LWS_EAGAIN ||
1559                                     LWS_ERRNO == LWS_EWOULDBLOCK) {
1560                                         lwsl_err("accept asks to try again\n");
1561                                         break;
1562                                 }
1563                                 lwsl_err("ERROR on accept: %s\n", strerror(LWS_ERRNO));
1564                                 break;
1565                         }
1566
1567                         lws_plat_set_socket_options(wsi->vhost, accept_fd);
1568
1569                         lwsl_debug("accepted new conn  port %u on fd=%d\n",
1570                                           ntohs(cli_addr.sin_port), accept_fd);
1571
1572 #else
1573                         /* not very beautiful... */
1574                         accept_fd = (lws_sockfd_type)pollfd;
1575 #endif
1576                         /*
1577                          * look at who we connected to and give user code a chance
1578                          * to reject based on client IP.  There's no protocol selected
1579                          * yet so we issue this to protocols[0]
1580                          */
1581                         if ((wsi->vhost->protocols[0].callback)(wsi,
1582                                         LWS_CALLBACK_FILTER_NETWORK_CONNECTION,
1583                                         NULL, (void *)(long)accept_fd, 0)) {
1584                                 lwsl_debug("Callback denied network connection\n");
1585                                 compatible_close(accept_fd);
1586                                 break;
1587                         }
1588
1589                         if (!lws_adopt_socket_vhost(wsi->vhost, accept_fd))
1590                                 /* already closed cleanly as necessary */
1591                                 return 1;
1592
1593 #if LWS_POSIX
1594                 } while (pt->fds_count < context->fd_limit_per_thread - 1 &&
1595                          lws_poll_listen_fd(&pt->fds[wsi->position_in_fds_table]) > 0);
1596 #endif
1597                 return 0;
1598
1599         default:
1600                 break;
1601         }
1602
1603         if (!lws_server_socket_service_ssl(wsi, accept_fd))
1604                 return 0;
1605
1606 fail:
1607         lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
1608
1609         return 1;
1610 }
1611
1612 /**
1613  * lws_serve_http_file() - Send a file back to the client using http
1614  * @wsi:                Websocket instance (available from user callback)
1615  * @file:               The file to issue over http
1616  * @content_type:       The http content type, eg, text/html
1617  * @other_headers:      NULL or pointer to header string
1618  * @other_headers_len:  length of the other headers if non-NULL
1619  *
1620  *      This function is intended to be called from the callback in response
1621  *      to http requests from the client.  It allows the callback to issue
1622  *      local files down the http link in a single step.
1623  *
1624  *      Returning <0 indicates error and the wsi should be closed.  Returning
1625  *      >0 indicates the file was completely sent and
1626  *      lws_http_transaction_completed() called on the wsi (and close if != 0)
1627  *      ==0 indicates the file transfer is started and needs more service later,
1628  *      the wsi should be left alone.
1629  */
1630
1631 LWS_VISIBLE int
1632 lws_serve_http_file(struct lws *wsi, const char *file, const char *content_type,
1633                     const char *other_headers, int other_headers_len)
1634 {
1635         static const char * const intermediates[] = { "private", "public" };
1636         struct lws_context *context = lws_get_context(wsi);
1637         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
1638         char cache_control[50], *cc = "no-store";
1639         unsigned char *response = pt->serv_buf + LWS_PRE;
1640         unsigned char *p = response;
1641         unsigned char *end = p + LWS_MAX_SOCKET_IO_BUF - LWS_PRE;
1642         int ret = 0, cclen = 8;
1643
1644         wsi->u.http.fd = lws_plat_file_open(wsi, file, &wsi->u.http.filelen,
1645                                             O_RDONLY);
1646
1647         if (wsi->u.http.fd == LWS_INVALID_FILE) {
1648                 lwsl_err("Unable to open '%s'\n", file);
1649                 lws_return_http_status(wsi, HTTP_STATUS_NOT_FOUND, NULL);
1650
1651                 return -1;
1652         }
1653
1654         if (lws_add_http_header_status(wsi, 200, &p, end))
1655                 return -1;
1656         if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE,
1657                                          (unsigned char *)content_type,
1658                                          strlen(content_type), &p, end))
1659                 return -1;
1660         if (lws_add_http_header_content_length(wsi, wsi->u.http.filelen, &p, end))
1661                 return -1;
1662
1663         if (wsi->cache_secs && wsi->cache_reuse) {
1664                 if (wsi->cache_revalidate) {
1665                         cc = cache_control;
1666                         cclen = sprintf(cache_control, "%s max-age: %u",
1667                                     intermediates[wsi->cache_intermediaries],
1668                                     wsi->cache_secs);
1669                 } else {
1670                         cc = "no-cache";
1671                         cclen = 8;
1672                 }
1673         }
1674
1675         if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CACHE_CONTROL,
1676                         (unsigned char *)cc, cclen, &p, end))
1677                 return -1;
1678
1679         if (other_headers) {
1680                 if ((end - p) < other_headers_len)
1681                         return -1;
1682                 memcpy(p, other_headers, other_headers_len);
1683                 p += other_headers_len;
1684         }
1685
1686         if (lws_finalize_http_header(wsi, &p, end))
1687                 return -1;
1688
1689         ret = lws_write(wsi, response, p - response, LWS_WRITE_HTTP_HEADERS);
1690         if (ret != (p - response)) {
1691                 lwsl_err("_write returned %d from %d\n", ret, (p - response));
1692                 return -1;
1693         }
1694
1695         wsi->u.http.filepos = 0;
1696         wsi->state = LWSS_HTTP_ISSUING_FILE;
1697
1698         return lws_serve_http_file_fragment(wsi);
1699 }
1700
1701 int
1702 lws_interpret_incoming_packet(struct lws *wsi, unsigned char **buf, size_t len)
1703 {
1704         int m;
1705
1706         lwsl_parser("%s: received %d byte packet\n", __func__, (int)len);
1707 #if 0
1708         lwsl_hexdump(*buf, len);
1709 #endif
1710
1711         /* let the rx protocol state machine have as much as it needs */
1712
1713         while (len) {
1714                 /*
1715                  * we were accepting input but now we stopped doing so
1716                  */
1717                 if (!(wsi->rxflow_change_to & LWS_RXFLOW_ALLOW)) {
1718                         lws_rxflow_cache(wsi, *buf, 0, len);
1719                         lwsl_parser("%s: cached %d\n", __func__, len);
1720                         return 1;
1721                 }
1722
1723                 if (wsi->u.ws.rx_draining_ext) {
1724                         m = lws_rx_sm(wsi, 0);
1725                         if (m < 0)
1726                                 return -1;
1727                         continue;
1728                 }
1729
1730                 /* account for what we're using in rxflow buffer */
1731                 if (wsi->rxflow_buffer)
1732                         wsi->rxflow_pos++;
1733
1734                 /* consume payload bytes efficiently */
1735                 if (wsi->lws_rx_parse_state ==
1736                     LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED)
1737                         lws_payload_until_length_exhausted(wsi, buf, &len);
1738
1739                 /* process the byte */
1740                 m = lws_rx_sm(wsi, *(*buf)++);
1741                 if (m < 0)
1742                         return -1;
1743                 len--;
1744         }
1745
1746         lwsl_parser("%s: exit with %d unused\n", __func__, (int)len);
1747
1748         return 0;
1749 }
1750
1751 LWS_VISIBLE void
1752 lws_server_get_canonical_hostname(struct lws_context *context,
1753                                   struct lws_context_creation_info *info)
1754 {
1755         if (lws_check_opt(info->options, LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME))
1756                 return;
1757 #if LWS_POSIX
1758         /* find canonical hostname */
1759         gethostname((char *)context->canonical_hostname,
1760                     sizeof(context->canonical_hostname) - 1);
1761
1762         lwsl_notice(" canonical_hostname = %s\n", context->canonical_hostname);
1763 #else
1764         (void)context;
1765 #endif
1766 }