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