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 #if defined (LWS_WITH_ESP8266)
  26 #undef memcpy
  27 void *memcpy(void *dest, const void *src, size_t n)
  28 {
  29         return ets_memcpy(dest, src, n);
  30 }
  31 #endif
  32
  33 int
  34 lws_context_init_server(struct lws_context_creation_info *info,
  35                         struct lws_vhost *vhost)
  36 {
  37 #if LWS_POSIX
  38         int n, opt = 1, limit = 1;
  39 #endif
  40         lws_sockfd_type sockfd;
  41         struct lws_vhost *vh;
  42         struct lws *wsi;
  43         int m = 0;
  44
  45         (void)opt;
  46         /* set up our external listening socket we serve on */
  47
  48         if (info->port == CONTEXT_PORT_NO_LISTEN || info->port == CONTEXT_PORT_NO_LISTEN_SERVER)
  49                 return 0;
  50
  51         vh = vhost->context->vhost_list;
  52         while (vh) {
  53                 if (vh->listen_port == info->port) {
  54                         if ((!info->iface && !vh->iface) ||
  55                             (info->iface && vh->iface &&
  56                             !strcmp(info->iface, vh->iface))) {
  57                                 vhost->listen_port = info->port;
  58                                 vhost->iface = info->iface;
  59                                 lwsl_notice(" using listen skt from vhost %s\n",
  60                                             vh->name);
  61                                 return 0;
  62                         }
  63                 }
  64                 vh = vh->vhost_next;
  65         }
  66
  67 #if LWS_POSIX
  68         (void)n;
  69 #if defined(__linux__)
  70         limit = vhost->context->count_threads;
  71 #endif
  72
  73         for (m = 0; m < limit; m++) {
  74 #ifdef LWS_USE_UNIX_SOCK
  75         if (LWS_UNIX_SOCK_ENABLED(vhost))
  76                 sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
  77         else
  78 #endif
  79 #ifdef LWS_USE_IPV6
  80         if (LWS_IPV6_ENABLED(vhost))
  81                 sockfd = socket(AF_INET6, SOCK_STREAM, 0);
  82         else
  83 #endif
  84                 sockfd = socket(AF_INET, SOCK_STREAM, 0);
  85
  86         if (sockfd == -1) {
  87 #else
  88 #if defined(LWS_WITH_ESP8266)
  89         sockfd = esp8266_create_tcp_listen_socket(vhost);
  90         if (!lws_sockfd_valid(sockfd)) {
  91 #endif
  92 #endif
  93                 lwsl_err("ERROR opening socket\n");
  94                 return 1;
  95         }
  96 #if LWS_POSIX && !defined(LWS_WITH_ESP32)
  97
  98 #if (defined(WIN32) || defined(_WIN32)) && defined(SO_EXCLUSIVEADDRUSE)
  99         /*
 100          * only accept that we are the only listener on the port
 101          * https://msdn.microsoft.com/zh-tw/library/windows/desktop/ms740621(v=vs.85).aspx
 102          *
 103          * for lws, to match Linux, we default to exclusive listen
 104          */
 105         if (!lws_check_opt(vhost->options, LWS_SERVER_OPTION_ALLOW_LISTEN_SHARE)) {
 106                 if (setsockopt(sockfd, SOL_SOCKET, SO_EXCLUSIVEADDRUSE,
 107                                (const void *)&opt, sizeof(opt)) < 0) {
 108                         lwsl_err("reuseaddr failed\n");
 109                         compatible_close(sockfd);
 110                         return 1;
 111                 }
 112         } else
 113 #endif
 114
 115         /*
 116          * allow us to restart even if old sockets in TIME_WAIT
 117          */
 118         if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
 119                        (const void *)&opt, sizeof(opt)) < 0) {
 120                 lwsl_err("reuseaddr failed\n");
 121                 compatible_close(sockfd);
 122                 return 1;
 123         }
 124
 125 #if defined(LWS_USE_IPV6) && defined(IPV6_V6ONLY)
 126         if (LWS_IPV6_ENABLED(vhost)) {
 127                 if (vhost->options & LWS_SERVER_OPTION_IPV6_V6ONLY_MODIFY) {
 128                         int value = (vhost->options & LWS_SERVER_OPTION_IPV6_V6ONLY_VALUE) ? 1 : 0;
 129                         if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
 130                                         (const void*)&value, sizeof(value)) < 0) {
 131                                 compatible_close(sockfd);
 132                                 return 1;
 133                         }
 134                 }
 135         }
 136 #endif
 137
 138 #if defined(__linux__) && defined(SO_REUSEPORT)
 139         n = lws_check_opt(vhost->options, LWS_SERVER_OPTION_ALLOW_LISTEN_SHARE);
 140 #if LWS_MAX_SMP > 1
 141         n = 1;
 142 #endif
 143
 144         if (n)
 145                 if (vhost->context->count_threads > 1)
 146                         if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEPORT,
 147                                         (const void *)&opt, sizeof(opt)) < 0) {
 148                                 compatible_close(sockfd);
 149                                 return 1;
 150                         }
 151 #endif
 152 #endif
 153         lws_plat_set_socket_options(vhost, sockfd);
 154
 155 #if LWS_POSIX
 156         n = lws_socket_bind(vhost, sockfd, info->port, info->iface);
 157         if (n < 0)
 158                 goto bail;
 159         info->port = n;
 160 #endif
 161         vhost->listen_port = info->port;
 162         vhost->iface = info->iface;
 163
 164         wsi = lws_zalloc(sizeof(struct lws));
 165         if (wsi == NULL) {
 166                 lwsl_err("Out of mem\n");
 167                 goto bail;
 168         }
 169         wsi->context = vhost->context;
 170         wsi->desc.sockfd = sockfd;
 171         wsi->mode = LWSCM_SERVER_LISTENER;
 172         wsi->protocol = vhost->protocols;
 173         wsi->tsi = m;
 174         wsi->vhost = vhost;
 175         wsi->listener = 1;
 176
 177 #ifdef LWS_USE_LIBUV
 178         if (LWS_LIBUV_ENABLED(vhost->context))
 179                 lws_uv_initvhost(vhost, wsi);
 180 #endif
 181
 182         if (insert_wsi_socket_into_fds(vhost->context, wsi))
 183                 goto bail;
 184
 185         vhost->context->count_wsi_allocated++;
 186         vhost->lserv_wsi = wsi;
 187
 188 #if LWS_POSIX
 189         n = listen(wsi->desc.sockfd, LWS_SOMAXCONN);
 190         if (n < 0) {
 191                 lwsl_err("listen failed with error %d\n", LWS_ERRNO);
 192                 vhost->lserv_wsi = NULL;
 193                 vhost->context->count_wsi_allocated--;
 194                 remove_wsi_socket_from_fds(wsi);
 195                 goto bail;
 196         }
 197         } /* for each thread able to independently listen */
 198 #else
 199 #if defined(LWS_WITH_ESP8266)
 200         esp8266_tcp_stream_bind(wsi->desc.sockfd, info->port, wsi);
 201 #endif
 202 #endif
 203         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS)) {
 204 #ifdef LWS_USE_UNIX_SOCK
 205                 if (LWS_UNIX_SOCK_ENABLED(vhost))
 206                         lwsl_notice(" Listening on \"%s\"\n", info->iface);
 207                 else
 208 #endif
 209                         lwsl_notice(" Listening on port %d\n", info->port);
 210         }
 211
 212         return 0;
 213
 214 bail:
 215         compatible_close(sockfd);
 216
 217         return 1;
 218 }
 219
 220 #if defined(LWS_WITH_ESP8266)
 221 #undef strchr
 222 #define strchr ets_strchr
 223 #endif
 224
 225 struct lws_vhost *
 226 lws_select_vhost(struct lws_context *context, int port, const char *servername)
 227 {
 228         struct lws_vhost *vhost = context->vhost_list;
 229         const char *p;
 230         int n, m, colon;
 231
 232         n = strlen(servername);
 233         colon = n;
 234         p = strchr(servername, ':');
 235         if (p)
 236                 colon = p - servername;
 237
 238         /* Priotity 1: first try exact matches */
 239
 240         while (vhost) {
 241                 if (port == vhost->listen_port &&
 242                     !strncmp(vhost->name, servername, colon)) {
 243                         lwsl_info("SNI: Found: %s\n", servername);
 244                         return vhost;
 245                 }
 246                 vhost = vhost->vhost_next;
 247         }
 248
 249         /*
 250          * Priority 2: if no exact matches, try matching *.vhost-name
 251          * unintentional matches are possible but resolve to x.com for *.x.com
 252          * which is reasonable.  If exact match exists we already chose it and
 253          * never reach here.  SSL will still fail it if the cert doesn't allow
 254          * *.x.com.
 255          */
 256
 257         vhost = context->vhost_list;
 258         while (vhost) {
 259                 m = strlen(vhost->name);
 260                 if (port == vhost->listen_port &&
 261                     m <= (colon - 2) &&
 262                     servername[colon - m - 1] == '.' &&
 263                     !strncmp(vhost->name, servername + colon - m, m)) {
 264                         lwsl_info("SNI: Found %s on wildcard: %s\n",
 265                                     servername, vhost->name);
 266                         return vhost;
 267                 }
 268                 vhost = vhost->vhost_next;
 269         }
 270
 271         /* Priority 3: match the first vhost on our port */
 272
 273         vhost = context->vhost_list;
 274         while (vhost) {
 275                 if (port == vhost->listen_port) {
 276                         lwsl_info("vhost match to %s based on port %d\n",
 277                                         vhost->name, port);
 278                         return vhost;
 279                 }
 280                 vhost = vhost->vhost_next;
 281         }
 282
 283         /* no match */
 284
 285         return NULL;
 286 }
 287
 288 LWS_VISIBLE LWS_EXTERN const char *
 289 lws_get_mimetype(const char *file, const struct lws_http_mount *m)
 290 {
 291         int n = strlen(file);
 292         const struct lws_protocol_vhost_options *pvo = NULL;
 293
 294         if (m)
 295                 pvo = m->extra_mimetypes;
 296
 297         if (n < 5)
 298                 return NULL;
 299
 300         if (!strcmp(&file[n - 4], ".ico"))
 301                 return "image/x-icon";
 302
 303         if (!strcmp(&file[n - 4], ".gif"))
 304                 return "image/gif";
 305
 306         if (!strcmp(&file[n - 3], ".js"))
 307                 return "text/javascript";
 308
 309         if (!strcmp(&file[n - 4], ".png"))
 310                 return "image/png";
 311
 312         if (!strcmp(&file[n - 4], ".jpg"))
 313                 return "image/jpeg";
 314
 315         if (!strcmp(&file[n - 3], ".gz"))
 316                 return "application/gzip";
 317
 318         if (!strcmp(&file[n - 4], ".JPG"))
 319                 return "image/jpeg";
 320
 321         if (!strcmp(&file[n - 5], ".html"))
 322                 return "text/html";
 323
 324         if (!strcmp(&file[n - 4], ".css"))
 325                 return "text/css";
 326
 327         if (!strcmp(&file[n - 4], ".txt"))
 328                 return "text/plain";
 329
 330         if (!strcmp(&file[n - 4], ".svg"))
 331                 return "image/svg+xml";
 332
 333         if (!strcmp(&file[n - 4], ".ttf"))
 334                 return "application/x-font-ttf";
 335
 336         if (!strcmp(&file[n - 4], ".otf"))
 337                 return "application/font-woff";
 338
 339         if (!strcmp(&file[n - 5], ".woff"))
 340                 return "application/font-woff";
 341
 342         if (!strcmp(&file[n - 4], ".xml"))
 343                 return "application/xml";
 344
 345         while (pvo) {
 346                 if (pvo->name[0] == '*') /* ie, match anything */
 347                         return pvo->value;
 348
 349                 if (!strcmp(&file[n - strlen(pvo->name)], pvo->name))
 350                         return pvo->value;
 351
 352                 pvo = pvo->next;
 353         }
 354
 355         return NULL;
 356 }
 357 static lws_fop_flags_t
 358 lws_vfs_prepare_flags(struct lws *wsi)
 359 {
 360         lws_fop_flags_t f = 0;
 361
 362         if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_ACCEPT_ENCODING))
 363                 return f;
 364
 365         if (strstr(lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_ACCEPT_ENCODING),
 366                    "gzip")) {
 367                 lwsl_info("client indicates GZIP is acceptable\n");
 368                 f |= LWS_FOP_FLAG_COMPR_ACCEPTABLE_GZIP;
 369         }
 370
 371         return f;
 372 }
 373
 374 static int
 375 lws_http_serve(struct lws *wsi, char *uri, const char *origin,
 376                const struct lws_http_mount *m)
 377 {
 378         const struct lws_protocol_vhost_options *pvo = m->interpret;
 379         struct lws_process_html_args args;
 380         const char *mimetype;
 381 #if !defined(_WIN32_WCE) && !defined(LWS_WITH_ESP8266)
 382         const struct lws_plat_file_ops *fops;
 383         const char *vpath;
 384         lws_fop_flags_t fflags = LWS_O_RDONLY;
 385 #if defined(WIN32) && defined(LWS_HAVE__STAT32I64)
 386         struct _stat32i64 st;
 387 #else
 388         struct stat st;
 389 #endif
 390         int spin = 0;
 391 #endif
 392         char path[256], sym[512];
 393         unsigned char *p = (unsigned char *)sym + 32 + LWS_PRE, *start = p;
 394         unsigned char *end = p + sizeof(sym) - 32 - LWS_PRE;
 395 #if !defined(WIN32) && LWS_POSIX && !defined(LWS_WITH_ESP32)
 396         size_t len;
 397 #endif
 398         int n;
 399
 400         lws_snprintf(path, sizeof(path) - 1, "%s/%s", origin, uri);
 401
 402 #if !defined(_WIN32_WCE) && !defined(LWS_WITH_ESP8266)
 403
 404         fflags |= lws_vfs_prepare_flags(wsi);
 405
 406         do {
 407                 spin++;
 408                 fops = lws_vfs_select_fops(wsi->context->fops, path, &vpath);
 409
 410                 if (wsi->u.http.fop_fd)
 411                         lws_vfs_file_close(&wsi->u.http.fop_fd);
 412
 413                 wsi->u.http.fop_fd = fops->LWS_FOP_OPEN(wsi->context->fops,
 414                                                         path, vpath, &fflags);
 415                 if (!wsi->u.http.fop_fd) {
 416                         lwsl_err("Unable to open '%s'\n", path);
 417
 418                         return -1;
 419                 }
 420
 421                 /* if it can't be statted, don't try */
 422                 if (fflags & LWS_FOP_FLAG_VIRTUAL)
 423                         break;
 424 #if defined(LWS_WITH_ESP32)
 425                 break;
 426 #endif
 427 #if !defined(WIN32)
 428                 if (fstat(wsi->u.http.fop_fd->fd, &st)) {
 429                         lwsl_info("unable to stat %s\n", path);
 430                         goto bail;
 431                 }
 432 #else
 433 #if defined(LWS_HAVE__STAT32I64)
 434                 if (_stat32i64(path, &st)) {
 435                         lwsl_info("unable to stat %s\n", path);
 436                         goto bail;
 437                 }
 438 #else
 439                 if (stat(path, &st)) {
 440                         lwsl_info("unable to stat %s\n", path);
 441                         goto bail;
 442                 }
 443 #endif
 444 #endif
 445
 446                 wsi->u.http.fop_fd->mod_time = (uint32_t)st.st_mtime;
 447                 fflags |= LWS_FOP_FLAG_MOD_TIME_VALID;
 448
 449                 lwsl_debug(" %s mode %d\n", path, S_IFMT & st.st_mode);
 450 #if !defined(WIN32) && LWS_POSIX && !defined(LWS_WITH_ESP32)
 451                 if ((S_IFMT & st.st_mode) == S_IFLNK) {
 452                         len = readlink(path, sym, sizeof(sym) - 1);
 453                         if (len) {
 454                                 lwsl_err("Failed to read link %s\n", path);
 455                                 goto bail;
 456                         }
 457                         sym[len] = '\0';
 458                         lwsl_debug("symlink %s -> %s\n", path, sym);
 459                         lws_snprintf(path, sizeof(path) - 1, "%s", sym);
 460                 }
 461 #endif
 462                 if ((S_IFMT & st.st_mode) == S_IFDIR) {
 463                         lwsl_debug("default filename append to dir\n");
 464                         lws_snprintf(path, sizeof(path) - 1, "%s/%s/index.html",
 465                                  origin, uri);
 466                 }
 467
 468         } while ((S_IFMT & st.st_mode) != S_IFREG && spin < 5);
 469
 470         if (spin == 5)
 471                 lwsl_err("symlink loop %s \n", path);
 472
 473         n = sprintf(sym, "%08lX%08lX",
 474                     (unsigned long)lws_vfs_get_length(wsi->u.http.fop_fd),
 475                     (unsigned long)lws_vfs_get_mod_time(wsi->u.http.fop_fd));
 476
 477         /* disable ranges if IF_RANGE token invalid */
 478
 479         if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_IF_RANGE))
 480                 if (strcmp(sym, lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_IF_RANGE)))
 481                         /* differs - defeat Range: */
 482                         wsi->u.http.ah->frag_index[WSI_TOKEN_HTTP_RANGE] = 0;
 483
 484         if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_IF_NONE_MATCH)) {
 485                 /*
 486                  * he thinks he has some version of it already,
 487                  * check if the tag matches
 488                  */
 489                 if (!strcmp(sym, lws_hdr_simple_ptr(wsi,
 490                                         WSI_TOKEN_HTTP_IF_NONE_MATCH))) {
 491
 492                         lwsl_debug("%s: ETAG match %s %s\n", __func__,
 493                                    uri, origin);
 494
 495                         /* we don't need to send the payload */
 496                         if (lws_add_http_header_status(wsi,
 497                                         HTTP_STATUS_NOT_MODIFIED, &p, end))
 498                                 return -1;
 499
 500                         if (lws_add_http_header_by_token(wsi,
 501                                         WSI_TOKEN_HTTP_ETAG,
 502                                         (unsigned char *)sym, n, &p, end))
 503                                 return -1;
 504
 505                         if (lws_finalize_http_header(wsi, &p, end))
 506                                 return -1;
 507
 508                         n = lws_write(wsi, start, p - start,
 509                                       LWS_WRITE_HTTP_HEADERS);
 510                         if (n != (p - start)) {
 511                                 lwsl_err("_write returned %d from %ld\n", n,
 512                                          (long)(p - start));
 513                                 return -1;
 514                         }
 515
 516                         lws_vfs_file_close(&wsi->u.http.fop_fd);
 517
 518                         return lws_http_transaction_completed(wsi);
 519                 }
 520         }
 521
 522         if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_ETAG,
 523                         (unsigned char *)sym, n, &p, end))
 524                 return -1;
 525 #endif
 526
 527         mimetype = lws_get_mimetype(path, m);
 528         if (!mimetype) {
 529                 lwsl_err("unknown mimetype for %s\n", path);
 530                goto bail;
 531         }
 532         if (!mimetype[0])
 533                 lwsl_debug("sending no mimetype for %s\n", path);
 534
 535         wsi->sending_chunked = 0;
 536
 537         /*
 538          * check if this is in the list of file suffixes to be interpreted by
 539          * a protocol
 540          */
 541         while (pvo) {
 542                 n = strlen(path);
 543                 if (n > (int)strlen(pvo->name) &&
 544                     !strcmp(&path[n - strlen(pvo->name)], pvo->name)) {
 545                         wsi->sending_chunked = 1;
 546                         wsi->protocol_interpret_idx = (char)(long)pvo->value;
 547                         lwsl_info("want %s interpreted by %s\n", path,
 548                                     wsi->vhost->protocols[(int)(long)(pvo->value)].name);
 549                         wsi->protocol = &wsi->vhost->protocols[(int)(long)(pvo->value)];
 550                         if (lws_ensure_user_space(wsi))
 551                                 return -1;
 552                         break;
 553                 }
 554                 pvo = pvo->next;
 555         }
 556
 557         if (m->protocol) {
 558                 const struct lws_protocols *pp = lws_vhost_name_to_protocol(
 559                                                         wsi->vhost, m->protocol);
 560
 561                 if (lws_bind_protocol(wsi, pp))
 562                         return 1;
 563                 args.p = (char *)p;
 564                 args.max_len = end - p;
 565                 if (pp->callback(wsi, LWS_CALLBACK_ADD_HEADERS,
 566                                           wsi->user_space, &args, 0))
 567                         return -1;
 568                 p = (unsigned char *)args.p;
 569         }
 570
 571         n = lws_serve_http_file(wsi, path, mimetype, (char *)start, p - start);
 572
 573         if (n < 0 || ((n > 0) && lws_http_transaction_completed(wsi)))
 574                 return -1; /* error or can't reuse connection: close the socket */
 575
 576         return 0;
 577 bail:
 578
 579         return -1;
 580 }
 581
 582 const struct lws_http_mount *
 583 lws_find_mount(struct lws *wsi, const char *uri_ptr, int uri_len)
 584 {
 585         const struct lws_http_mount *hm, *hit = NULL;
 586         int best = 0;
 587
 588         hm = wsi->vhost->mount_list;
 589         while (hm) {
 590                 if (uri_len >= hm->mountpoint_len &&
 591                     !strncmp(uri_ptr, hm->mountpoint, hm->mountpoint_len) &&
 592                     (uri_ptr[hm->mountpoint_len] == '\0' ||
 593                      uri_ptr[hm->mountpoint_len] == '/' ||
 594                      hm->mountpoint_len == 1)
 595                     ) {
 596                         if (hm->origin_protocol == LWSMPRO_CALLBACK ||
 597                             ((hm->origin_protocol == LWSMPRO_CGI ||
 598                              lws_hdr_total_length(wsi, WSI_TOKEN_GET_URI) ||
 599                              hm->protocol) &&
 600                             hm->mountpoint_len > best)) {
 601                                 best = hm->mountpoint_len;
 602                                 hit = hm;
 603                         }
 604                 }
 605                 hm = hm->mount_next;
 606         }
 607
 608         return hit;
 609 }
 610
 611 #if LWS_POSIX
 612
 613 static int
 614 lws_find_string_in_file(const char *filename, const char *string, int stringlen)
 615 {
 616         char buf[128];
 617         int fd, match = 0, pos = 0, n = 0, hit = 0;
 618
 619         fd = open(filename, O_RDONLY);
 620         if (fd < 0) {
 621                 lwsl_err("can't open auth file: %s\n", filename);
 622                 return 1;
 623         }
 624
 625         while (1) {
 626                 if (pos == n) {
 627                         n = read(fd, buf, sizeof(buf));
 628                         if (n <= 0) {
 629                                 if (match == stringlen)
 630                                         hit = 1;
 631                                 break;
 632                         }
 633                         pos = 0;
 634                 }
 635
 636                 if (match == stringlen) {
 637                         if (buf[pos] == '\r' || buf[pos] == '\n') {
 638                                 hit = 1;
 639                                 break;
 640                         }
 641                         match = 0;
 642                 }
 643
 644                 if (buf[pos] == string[match])
 645                         match++;
 646                 else
 647                         match = 0;
 648
 649                 pos++;
 650         }
 651
 652         close(fd);
 653
 654         return hit;
 655 }
 656
 657 static int
 658 lws_unauthorised_basic_auth(struct lws *wsi)
 659 {
 660         struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
 661         unsigned char *start = pt->serv_buf + LWS_PRE,
 662                       *p = start, *end = p + 512;
 663         char buf[64];
 664         int n;
 665
 666         /* no auth... tell him it is required */
 667
 668         if (lws_add_http_header_status(wsi, HTTP_STATUS_UNAUTHORIZED, &p, end))
 669                 return -1;
 670
 671         n = lws_snprintf(buf, sizeof(buf), "Basic realm=\"lwsws\"");
 672         if (lws_add_http_header_by_token(wsi,
 673                         WSI_TOKEN_HTTP_WWW_AUTHENTICATE,
 674                         (unsigned char *)buf, n, &p, end))
 675                 return -1;
 676
 677         if (lws_finalize_http_header(wsi, &p, end))
 678                 return -1;
 679
 680         n = lws_write(wsi, start, p - start, LWS_WRITE_HTTP_HEADERS);
 681         if (n < 0)
 682                 return -1;
 683
 684         return lws_http_transaction_completed(wsi);
 685
 686 }
 687
 688 #endif
 689
 690 int lws_clean_url(char *p)
 691 {
 692         while (*p) {
 693                 if (p[0] == '/' && p[1] == '/') {
 694                         char *p1 = p;
 695                         while (*p1) {
 696                                 *p1 = p1[1];
 697                                 p1++;
 698                         }
 699                         continue;
 700                 }
 701                 p++;
 702         }
 703
 704         return 0;
 705 }
 706
 707 int
 708 lws_http_action(struct lws *wsi)
 709 {
 710         struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
 711         enum http_connection_type connection_type;
 712         enum http_version request_version;
 713         char content_length_str[32];
 714         struct lws_process_html_args args;
 715         const struct lws_http_mount *hit = NULL;
 716         unsigned int n, count = 0;
 717         char http_version_str[10];
 718         char http_conn_str[20];
 719         int http_version_len;
 720         char *uri_ptr = NULL, *s;
 721         int uri_len = 0;
 722         int meth = -1;
 723
 724         static const unsigned char methods[] = {
 725                 WSI_TOKEN_GET_URI,
 726                 WSI_TOKEN_POST_URI,
 727                 WSI_TOKEN_OPTIONS_URI,
 728                 WSI_TOKEN_PUT_URI,
 729                 WSI_TOKEN_PATCH_URI,
 730                 WSI_TOKEN_DELETE_URI,
 731                 WSI_TOKEN_CONNECT,
 732 #ifdef LWS_USE_HTTP2
 733                 WSI_TOKEN_HTTP_COLON_PATH,
 734 #endif
 735         };
 736 #if defined(_DEBUG) || defined(LWS_WITH_ACCESS_LOG)
 737         static const char * const method_names[] = {
 738                 "GET", "POST", "OPTIONS", "PUT", "PATCH", "DELETE", "CONNECT",
 739 #ifdef LWS_USE_HTTP2
 740                 ":path",
 741 #endif
 742         };
 743 #endif
 744         static const char * const oprot[] = {
 745                 "http://", "https://"
 746         };
 747
 748         /* it's not websocket.... shall we accept it as http? */
 749
 750         for (n = 0; n < ARRAY_SIZE(methods); n++)
 751                 if (lws_hdr_total_length(wsi, methods[n]))
 752                         count++;
 753         if (!count) {
 754                 lwsl_warn("Missing URI in HTTP request\n");
 755                 goto bail_nuke_ah;
 756         }
 757
 758         if (count != 1) {
 759                 lwsl_warn("multiple methods?\n");
 760                 goto bail_nuke_ah;
 761         }
 762
 763         if (lws_ensure_user_space(wsi))
 764                 goto bail_nuke_ah;
 765
 766         for (n = 0; n < ARRAY_SIZE(methods); n++)
 767                 if (lws_hdr_total_length(wsi, methods[n])) {
 768                         uri_ptr = lws_hdr_simple_ptr(wsi, methods[n]);
 769                         uri_len = lws_hdr_total_length(wsi, methods[n]);
 770                         lwsl_info("Method: %s request for '%s'\n",
 771                                         method_names[n], uri_ptr);
 772                         meth = n;
 773                         break;
 774                 }
 775
 776         (void)meth;
 777
 778         /* we insist on absolute paths */
 779
 780         if (uri_ptr[0] != '/') {
 781                 lws_return_http_status(wsi, HTTP_STATUS_FORBIDDEN, NULL);
 782
 783                 goto bail_nuke_ah;
 784         }
 785
 786         /* HTTP header had a content length? */
 787
 788         wsi->u.http.content_length = 0;
 789         if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI) ||
 790                 lws_hdr_total_length(wsi, WSI_TOKEN_PATCH_URI) ||
 791                 lws_hdr_total_length(wsi, WSI_TOKEN_PUT_URI))
 792                 wsi->u.http.content_length = 100 * 1024 * 1024;
 793
 794         if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_CONTENT_LENGTH)) {
 795                 lws_hdr_copy(wsi, content_length_str,
 796                              sizeof(content_length_str) - 1,
 797                              WSI_TOKEN_HTTP_CONTENT_LENGTH);
 798                 wsi->u.http.content_length = atoll(content_length_str);
 799         }
 800
 801         if (wsi->http2_substream) {
 802                 wsi->u.http.request_version = HTTP_VERSION_2;
 803         } else {
 804                 /* http_version? Default to 1.0, override with token: */
 805                 request_version = HTTP_VERSION_1_0;
 806
 807                 /* Works for single digit HTTP versions. : */
 808                 http_version_len = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP);
 809                 if (http_version_len > 7) {
 810                         lws_hdr_copy(wsi, http_version_str,
 811                                         sizeof(http_version_str) - 1, WSI_TOKEN_HTTP);
 812                         if (http_version_str[5] == '1' && http_version_str[7] == '1')
 813                                 request_version = HTTP_VERSION_1_1;
 814                 }
 815                 wsi->u.http.request_version = request_version;
 816
 817                 /* HTTP/1.1 defaults to "keep-alive", 1.0 to "close" */
 818                 if (request_version == HTTP_VERSION_1_1)
 819                         connection_type = HTTP_CONNECTION_KEEP_ALIVE;
 820                 else
 821                         connection_type = HTTP_CONNECTION_CLOSE;
 822
 823                 /* Override default if http "Connection:" header: */
 824                 if (lws_hdr_total_length(wsi, WSI_TOKEN_CONNECTION)) {
 825                         lws_hdr_copy(wsi, http_conn_str, sizeof(http_conn_str) - 1,
 826                                      WSI_TOKEN_CONNECTION);
 827                         http_conn_str[sizeof(http_conn_str) - 1] = '\0';
 828                         if (!strcasecmp(http_conn_str, "keep-alive"))
 829                                 connection_type = HTTP_CONNECTION_KEEP_ALIVE;
 830                         else
 831                                 if (!strcasecmp(http_conn_str, "close"))
 832                                         connection_type = HTTP_CONNECTION_CLOSE;
 833                 }
 834                 wsi->u.http.connection_type = connection_type;
 835         }
 836
 837         n = wsi->protocol->callback(wsi, LWS_CALLBACK_FILTER_HTTP_CONNECTION,
 838                                     wsi->user_space, uri_ptr, uri_len);
 839         if (n) {
 840                 lwsl_info("LWS_CALLBACK_HTTP closing\n");
 841
 842                 return 1;
 843         }
 844         /*
 845          * if there is content supposed to be coming,
 846          * put a timeout on it having arrived
 847          */
 848         lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT,
 849                         wsi->context->timeout_secs);
 850 #ifdef LWS_OPENSSL_SUPPORT
 851         if (wsi->redirect_to_https) {
 852                 /*
 853                  * we accepted http:// only so we could redirect to
 854                  * https://, so issue the redirect.  Create the redirection
 855                  * URI from the host: header and ignore the path part
 856                  */
 857                 unsigned char *start = pt->serv_buf + LWS_PRE, *p = start,
 858                               *end = p + 512;
 859
 860                 if (!lws_hdr_total_length(wsi, WSI_TOKEN_HOST))
 861                         goto bail_nuke_ah;
 862
 863                 n = sprintf((char *)end, "https://%s/",
 864                             lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST));
 865
 866                 n = lws_http_redirect(wsi, HTTP_STATUS_MOVED_PERMANENTLY,
 867                                       end, n, &p, end);
 868                 if ((int)n < 0)
 869                         goto bail_nuke_ah;
 870
 871                 return lws_http_transaction_completed(wsi);
 872         }
 873 #endif
 874
 875 #ifdef LWS_WITH_ACCESS_LOG
 876         /*
 877          * Produce Apache-compatible log string for wsi, like this:
 878          *
 879          * 2.31.234.19 - - [27/Mar/2016:03:22:44 +0800]
 880          * "GET /aep-screen.png HTTP/1.1"
 881          * 200 152987 "https://libwebsockets.org/index.html"
 882          * "Mozilla/5.0 (Macint... Chrome/49.0.2623.87 Safari/537.36"
 883          *
 884          */
 885         {
 886                 static const char * const hver[] = {
 887                         "http/1.0", "http/1.1", "http/2"
 888                 };
 889 #ifdef LWS_USE_IPV6
 890                 char ads[INET6_ADDRSTRLEN];
 891 #else
 892                 char ads[INET_ADDRSTRLEN];
 893 #endif
 894                 char da[64];
 895                 const char *pa, *me;
 896                 struct tm *tmp;
 897                 time_t t = time(NULL);
 898                 int l = 256;
 899
 900                 if (wsi->access_log_pending)
 901                         lws_access_log(wsi);
 902
 903                 wsi->access_log.header_log = lws_malloc(l);
 904                 if (wsi->access_log.header_log) {
 905
 906                         tmp = localtime(&t);
 907                         if (tmp)
 908                                 strftime(da, sizeof(da), "%d/%b/%Y:%H:%M:%S %z", tmp);
 909                         else
 910                                 strcpy(da, "01/Jan/1970:00:00:00 +0000");
 911
 912                         pa = lws_get_peer_simple(wsi, ads, sizeof(ads));
 913                         if (!pa)
 914                                 pa = "(unknown)";
 915
 916                         if (meth >= 0)
 917                                 me = method_names[meth];
 918                         else
 919                                 me = "unknown";
 920
 921                         lws_snprintf(wsi->access_log.header_log, l,
 922                                  "%s - - [%s] \"%s %s %s\"",
 923                                  pa, da, me, uri_ptr,
 924                                  hver[wsi->u.http.request_version]);
 925
 926                         l = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_USER_AGENT);
 927                         if (l) {
 928                                 wsi->access_log.user_agent = lws_malloc(l + 2);
 929                                 if (wsi->access_log.user_agent)
 930                                         lws_hdr_copy(wsi, wsi->access_log.user_agent,
 931                                                         l + 1, WSI_TOKEN_HTTP_USER_AGENT);
 932                                 else
 933                                         lwsl_err("OOM getting user agent\n");
 934                         }
 935                         wsi->access_log_pending = 1;
 936                 }
 937         }
 938 #endif
 939
 940         /* can we serve it from the mount list? */
 941
 942         hit = lws_find_mount(wsi, uri_ptr, uri_len);
 943         if (!hit) {
 944                 /* deferred cleanup and reset to protocols[0] */
 945
 946                 lwsl_info("no hit\n");
 947
 948                 if (lws_bind_protocol(wsi, &wsi->vhost->protocols[0]))
 949                         return 1;
 950
 951                 n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP,
 952                                     wsi->user_space, uri_ptr, uri_len);
 953
 954                 goto after;
 955         }
 956
 957         s = uri_ptr + hit->mountpoint_len;
 958
 959         /*
 960          * if we have a mountpoint like https://xxx.com/yyy
 961          * there is an implied / at the end for our purposes since
 962          * we can only mount on a "directory".
 963          *
 964          * But if we just go with that, the browser cannot understand
 965          * that he is actually looking down one "directory level", so
 966          * even though we give him /yyy/abc.html he acts like the
 967          * current directory level is /.  So relative urls like "x.png"
 968          * wrongly look outside the mountpoint.
 969          *
 970          * Therefore if we didn't come in on a url with an explicit
 971          * / at the end, we must redirect to add it so the browser
 972          * understands he is one "directory level" down.
 973          */
 974         if ((hit->mountpoint_len > 1 ||
 975              (hit->origin_protocol == LWSMPRO_REDIR_HTTP ||
 976               hit->origin_protocol == LWSMPRO_REDIR_HTTPS)) &&
 977             (*s != '/' ||
 978              (hit->origin_protocol == LWSMPRO_REDIR_HTTP ||
 979               hit->origin_protocol == LWSMPRO_REDIR_HTTPS)) &&
 980             (hit->origin_protocol != LWSMPRO_CGI &&
 981              hit->origin_protocol != LWSMPRO_CALLBACK //&&
 982              //hit->protocol == NULL
 983              )) {
 984                 unsigned char *start = pt->serv_buf + LWS_PRE,
 985                               *p = start, *end = p + 512;
 986
 987                 lwsl_debug("Doing 301 '%s' org %s\n", s, hit->origin);
 988
 989                 if (!lws_hdr_total_length(wsi, WSI_TOKEN_HOST))
 990                         goto bail_nuke_ah;
 991
 992                 /* > at start indicates deal with by redirect */
 993                 if (hit->origin_protocol == LWSMPRO_REDIR_HTTP ||
 994                     hit->origin_protocol == LWSMPRO_REDIR_HTTPS)
 995                         n = lws_snprintf((char *)end, 256, "%s%s",
 996                                     oprot[hit->origin_protocol & 1],
 997                                     hit->origin);
 998                 else
 999                         n = lws_snprintf((char *)end, 256,
1000                             "%s%s%s/", oprot[lws_is_ssl(wsi)],
1001                             lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST),
1002                             uri_ptr);
1003                 lws_clean_url((char *)end);
1004
1005                 n = lws_http_redirect(wsi, HTTP_STATUS_MOVED_PERMANENTLY,
1006                                       end, n, &p, end);
1007                 if ((int)n < 0)
1008                         goto bail_nuke_ah;
1009
1010                 return lws_http_transaction_completed(wsi);
1011         }
1012
1013 #if LWS_POSIX
1014         /* basic auth? */
1015
1016         if (hit->basic_auth_login_file) {
1017                 char b64[160], plain[(sizeof(b64) * 3) / 4];
1018                 int m;
1019
1020                 /* Did he send auth? */
1021                 if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_AUTHORIZATION))
1022                         return lws_unauthorised_basic_auth(wsi);
1023
1024                 n = HTTP_STATUS_FORBIDDEN;
1025
1026                 m = lws_hdr_copy(wsi, b64, sizeof(b64), WSI_TOKEN_HTTP_AUTHORIZATION);
1027                 if (m < 7) {
1028                         lwsl_err("b64 auth too long\n");
1029                         goto transaction_result_n;
1030                 }
1031
1032                 b64[5] = '\0';
1033                 if (strcasecmp(b64, "Basic")) {
1034                         lwsl_err("auth missing basic: %s\n", b64);
1035                         goto transaction_result_n;
1036                 }
1037
1038                 /* It'll be like Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l */
1039
1040                 m = lws_b64_decode_string(b64 + 6, plain, sizeof(plain));
1041                 if (m < 0) {
1042                         lwsl_err("plain auth too long\n");
1043                         goto transaction_result_n;
1044                 }
1045
1046 //              lwsl_notice(plain);
1047
1048                 if (!lws_find_string_in_file(hit->basic_auth_login_file, plain, m)) {
1049                         lwsl_err("basic auth lookup failed\n");
1050                         return lws_unauthorised_basic_auth(wsi);
1051                 }
1052
1053                 lwsl_notice("basic auth accepted\n");
1054
1055                 /* accept the auth */
1056         }
1057 #endif
1058
1059 #if defined(LWS_WITH_HTTP_PROXY)
1060         /*
1061          * The mount is a reverse proxy?
1062          */
1063
1064         if (hit->origin_protocol == LWSMPRO_HTTPS ||
1065             hit->origin_protocol == LWSMPRO_HTTP)  {
1066                 struct lws_client_connect_info i;
1067                 char ads[96], rpath[256], *pcolon, *pslash, *p;
1068                 int n, na;
1069
1070                 memset(&i, 0, sizeof(i));
1071                 i.context = lws_get_context(wsi);
1072
1073                 pcolon = strchr(hit->origin, ':');
1074                 pslash = strchr(hit->origin, '/');
1075                 if (!pslash) {
1076                         lwsl_err("Proxy mount origin '%s' must have /\n", hit->origin);
1077                         return -1;
1078                 }
1079                 if (pcolon > pslash)
1080                         pcolon = NULL;
1081
1082                 if (pcolon)
1083                         n = pcolon - hit->origin;
1084                 else
1085                         n = pslash - hit->origin;
1086
1087                 if (n >= sizeof(ads) - 2)
1088                         n = sizeof(ads) - 2;
1089
1090                 memcpy(ads, hit->origin, n);
1091                 ads[n] = '\0';
1092
1093                 i.address = ads;
1094                 i.port = 80;
1095                 if (hit->origin_protocol == LWSMPRO_HTTPS) {
1096                         i.port = 443;
1097                         i.ssl_connection = 1;
1098                 }
1099                 if (pcolon)
1100                         i.port = atoi(pcolon + 1);
1101
1102                 lws_snprintf(rpath, sizeof(rpath) - 1, "/%s/%s", pslash + 1, uri_ptr + hit->mountpoint_len);
1103                 lws_clean_url(rpath);
1104                 na = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_URI_ARGS);
1105                 if (na) {
1106                         p = rpath + strlen(rpath);
1107                         *p++ = '?';
1108                         lws_hdr_copy(wsi, p, &rpath[sizeof(rpath) - 1] - p, WSI_TOKEN_HTTP_URI_ARGS);
1109                         while (--na) {
1110                                 if (*p == '\0')
1111                                         *p = '&';
1112                                 p++;
1113                         }
1114                 }
1115
1116
1117                 i.path = rpath;
1118                 i.host = i.address;
1119                 i.origin = NULL;
1120                 i.method = "GET";
1121                 i.parent_wsi = wsi;
1122                 i.uri_replace_from = hit->origin;
1123                 i.uri_replace_to = hit->mountpoint;
1124
1125                 lwsl_notice("proxying to %s port %d url %s, ssl %d, from %s, to %s\n",
1126                                 i.address, i.port, i.path, i.ssl_connection, i.uri_replace_from, i.uri_replace_to);
1127
1128                 if (!lws_client_connect_via_info(&i)) {
1129                         lwsl_err("proxy connect fail\n");
1130                         return 1;
1131                 }
1132
1133                 return 0;
1134         }
1135 #endif
1136
1137         /*
1138          * A particular protocol callback is mounted here?
1139          *
1140          * For the duration of this http transaction, bind us to the
1141          * associated protocol
1142          */
1143         if (hit->origin_protocol == LWSMPRO_CALLBACK || hit->protocol) {
1144                 const struct lws_protocols *pp;
1145                 const char *name = hit->origin;
1146                 if (hit->protocol)
1147                         name = hit->protocol;
1148
1149                 pp = lws_vhost_name_to_protocol(wsi->vhost, name);
1150                 if (!pp) {
1151                         n = -1;
1152                         lwsl_err("Unable to find plugin '%s'\n",
1153                                  hit->origin);
1154                         return 1;
1155                 }
1156
1157                 if (lws_bind_protocol(wsi, pp))
1158                         return 1;
1159
1160                 args.p = uri_ptr;
1161                 args.len = uri_len;
1162                 args.max_len = hit->auth_mask;
1163                 args.final = 0; /* used to signal callback dealt with it */
1164
1165                 n = wsi->protocol->callback(wsi, LWS_CALLBACK_CHECK_ACCESS_RIGHTS,
1166                                             wsi->user_space, &args, 0);
1167                 if (n) {
1168                         lws_return_http_status(wsi, HTTP_STATUS_UNAUTHORIZED,
1169                                                NULL);
1170                         goto bail_nuke_ah;
1171                 }
1172                 if (args.final) /* callback completely handled it well */
1173                         return 0;
1174
1175                 if (hit->cgienv && wsi->protocol->callback(wsi,
1176                                 LWS_CALLBACK_HTTP_PMO,
1177                                 wsi->user_space, (void *)hit->cgienv, 0))
1178                         return 1;
1179
1180                 if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI)) {
1181                         n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP,
1182                                             wsi->user_space,
1183                                             uri_ptr + hit->mountpoint_len,
1184                                             uri_len - hit->mountpoint_len);
1185                         goto after;
1186                 }
1187         }
1188
1189 #ifdef LWS_WITH_CGI
1190         /* did we hit something with a cgi:// origin? */
1191         if (hit->origin_protocol == LWSMPRO_CGI) {
1192                 const char *cmd[] = {
1193                         NULL, /* replace with cgi path */
1194                         NULL
1195                 };
1196
1197                 lwsl_debug("%s: cgi\n", __func__);
1198                 cmd[0] = hit->origin;
1199
1200                 n = 5;
1201                 if (hit->cgi_timeout)
1202                         n = hit->cgi_timeout;
1203
1204                 n = lws_cgi(wsi, cmd, hit->mountpoint_len, n,
1205                             hit->cgienv);
1206                 if (n) {
1207                         lwsl_err("%s: cgi failed\n", __func__);
1208                         return -1;
1209                 }
1210
1211                 goto deal_body;
1212         }
1213 #endif
1214
1215         n = strlen(s);
1216         if (s[0] == '\0' || (n == 1 && s[n - 1] == '/'))
1217                 s = (char *)hit->def;
1218         if (!s)
1219                 s = "index.html";
1220
1221         wsi->cache_secs = hit->cache_max_age;
1222         wsi->cache_reuse = hit->cache_reusable;
1223         wsi->cache_revalidate = hit->cache_revalidate;
1224         wsi->cache_intermediaries = hit->cache_intermediaries;
1225
1226         n = lws_http_serve(wsi, s, hit->origin, hit);
1227         if (n) {
1228                 /*
1229                  *      lws_return_http_status(wsi, HTTP_STATUS_NOT_FOUND, NULL);
1230                  */
1231                 if (hit->protocol) {
1232                         const struct lws_protocols *pp = lws_vhost_name_to_protocol(
1233                                         wsi->vhost, hit->protocol);
1234
1235                         if (lws_bind_protocol(wsi, pp))
1236                                 return 1;
1237
1238                         n = pp->callback(wsi, LWS_CALLBACK_HTTP,
1239                                          wsi->user_space,
1240                                          uri_ptr + hit->mountpoint_len,
1241                                          uri_len - hit->mountpoint_len);
1242                 } else
1243                         n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP,
1244                                     wsi->user_space, uri_ptr, uri_len);
1245         }
1246
1247 after:
1248         if (n) {
1249                 lwsl_info("LWS_CALLBACK_HTTP closing\n");
1250
1251                 return 1;
1252         }
1253
1254 #ifdef LWS_WITH_CGI
1255 deal_body:
1256 #endif
1257         /*
1258          * If we're not issuing a file, check for content_length or
1259          * HTTP keep-alive. No keep-alive header allocation for
1260          * ISSUING_FILE, as this uses HTTP/1.0.
1261          *
1262          * In any case, return 0 and let lws_read decide how to
1263          * proceed based on state
1264          */
1265         if (wsi->state != LWSS_HTTP_ISSUING_FILE)
1266                 /* Prepare to read body if we have a content length: */
1267                 if (wsi->u.http.content_length > 0)
1268                         wsi->state = LWSS_HTTP_BODY;
1269
1270         return 0;
1271
1272 bail_nuke_ah:
1273         /* we're closing, losing some rx is OK */
1274         wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
1275         // lwsl_notice("%s: drop1\n", __func__);
1276         lws_header_table_detach(wsi, 1);
1277
1278         return 1;
1279 #if LWS_POSIX
1280 transaction_result_n:
1281         lws_return_http_status(wsi, n, NULL);
1282
1283         return lws_http_transaction_completed(wsi);
1284 #endif
1285 }
1286
1287 int
1288 lws_handshake_server(struct lws *wsi, unsigned char **buf, size_t len)
1289 {
1290         int protocol_len, n = 0, hit, non_space_char_found = 0, m;
1291         struct lws_context *context = lws_get_context(wsi);
1292         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
1293         struct _lws_header_related hdr;
1294         struct allocated_headers *ah;
1295         unsigned char *obuf = *buf;
1296         char protocol_list[128];
1297         char protocol_name[64];
1298         size_t olen = len;
1299         char *p;
1300
1301         if (len >= 10000000) {
1302                 lwsl_err("%s: assert: len %ld\n", __func__, (long)len);
1303                 assert(0);
1304         }
1305
1306         if (!wsi->u.hdr.ah) {
1307                 lwsl_err("%s: assert: NULL ah\n", __func__);
1308                 assert(0);
1309         }
1310
1311         while (len--) {
1312                 wsi->more_rx_waiting = !!len;
1313
1314                 if (wsi->mode != LWSCM_HTTP_SERVING &&
1315                     wsi->mode != LWSCM_HTTP_SERVING_ACCEPTED) {
1316                         lwsl_err("%s: bad wsi mode %d\n", __func__, wsi->mode);
1317                         goto bail_nuke_ah;
1318                 }
1319
1320                 m = lws_parse(wsi, *(*buf)++);
1321                 if (m) {
1322                         if (m == 2) {
1323                                 /*
1324                                  * we are transitioning from http with
1325                                  * an AH, to raw.  Drop the ah and set
1326                                  * the mode.
1327                                  */
1328 raw_transition:
1329                                 lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
1330                                 lws_bind_protocol(wsi, &wsi->vhost->protocols[
1331                                                         wsi->vhost->
1332                                                         raw_protocol_index]);
1333                                 lwsl_info("transition to raw vh %s prot %d\n",
1334                                           wsi->vhost->name,
1335                                           wsi->vhost->raw_protocol_index);
1336                                 if ((wsi->protocol->callback)(wsi,
1337                                                 LWS_CALLBACK_RAW_ADOPT,
1338                                                 wsi->user_space, NULL, 0))
1339                                         goto bail_nuke_ah;
1340
1341                                 wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
1342                                 lws_union_transition(wsi, LWSCM_RAW);
1343                                 lws_header_table_detach(wsi, 1);
1344
1345                                 if (m == 2 && (wsi->protocol->callback)(wsi,
1346                                                 LWS_CALLBACK_RAW_RX,
1347                                                 wsi->user_space, obuf, olen))
1348                                         return 1;
1349
1350                                 return 0;
1351                         }
1352                         lwsl_info("lws_parse failed\n");
1353                         goto bail_nuke_ah;
1354                 }
1355
1356                 if (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE)
1357                         continue;
1358
1359                 lwsl_parser("%s: lws_parse sees parsing complete\n", __func__);
1360                 lwsl_debug("%s: wsi->more_rx_waiting=%d\n", __func__,
1361                                 wsi->more_rx_waiting);
1362
1363                 /* check for unwelcome guests */
1364
1365                 if (wsi->context->reject_service_keywords) {
1366                         const struct lws_protocol_vhost_options *rej =
1367                                         wsi->context->reject_service_keywords;
1368                         char ua[384], *msg = NULL;
1369
1370                         if (lws_hdr_copy(wsi, ua, sizeof(ua) - 1,
1371                                           WSI_TOKEN_HTTP_USER_AGENT) > 0) {
1372                                 ua[sizeof(ua) - 1] = '\0';
1373                                 while (rej) {
1374                                         if (strstr(ua, rej->name)) {
1375                                                 msg = strchr(rej->value, ' ');
1376                                                 if (msg)
1377                                                         msg++;
1378                                                 lws_return_http_status(wsi, atoi(rej->value), msg);
1379
1380                                                 wsi->vhost->conn_stats.rejected++;
1381
1382                                                 goto bail_nuke_ah;
1383                                         }
1384                                         rej = rej->next;
1385                                 }
1386                         }
1387                 }
1388
1389                 /* select vhost */
1390
1391                 if (lws_hdr_total_length(wsi, WSI_TOKEN_HOST)) {
1392                         struct lws_vhost *vhost = lws_select_vhost(
1393                                 context, wsi->vhost->listen_port,
1394                                 lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST));
1395
1396                         if (vhost)
1397                                 wsi->vhost = vhost;
1398                 } else
1399                         lwsl_info("no host\n");
1400
1401                 wsi->vhost->conn_stats.trans++;
1402                 if (!wsi->conn_stat_done) {
1403                         wsi->vhost->conn_stats.conn++;
1404                         wsi->conn_stat_done = 1;
1405                 }
1406
1407                 if (lws_hdr_total_length(wsi, WSI_TOKEN_CONNECT)) {
1408                         lwsl_info("Changing to RAW mode\n");
1409                         m = 0;
1410                         goto raw_transition;
1411                 }
1412
1413                 wsi->mode = LWSCM_PRE_WS_SERVING_ACCEPT;
1414                 lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
1415
1416                 /* is this websocket protocol or normal http 1.0? */
1417
1418                 if (lws_hdr_total_length(wsi, WSI_TOKEN_UPGRADE)) {
1419                         if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
1420                                         "websocket")) {
1421                                 wsi->vhost->conn_stats.ws_upg++;
1422                                 lwsl_info("Upgrade to ws\n");
1423                                 goto upgrade_ws;
1424                         }
1425 #ifdef LWS_USE_HTTP2
1426                         if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
1427                                         "h2c")) {
1428                                 wsi->vhost->conn_stats.http2_upg++;
1429                                 lwsl_info("Upgrade to h2c\n");
1430                                 goto upgrade_h2c;
1431                         }
1432 #endif
1433                         lwsl_info("Unknown upgrade\n");
1434                         /* dunno what he wanted to upgrade to */
1435                         goto bail_nuke_ah;
1436                 }
1437
1438                 /* no upgrade ack... he remained as HTTP */
1439
1440                 lwsl_info("No upgrade\n");
1441                 ah = wsi->u.hdr.ah;
1442
1443                 lws_union_transition(wsi, LWSCM_HTTP_SERVING_ACCEPTED);
1444                 wsi->state = LWSS_HTTP;
1445                 wsi->u.http.fop_fd = NULL;
1446
1447                 /* expose it at the same offset as u.hdr */
1448                 wsi->u.http.ah = ah;
1449                 lwsl_debug("%s: wsi %p: ah %p\n", __func__, (void *)wsi,
1450                            (void *)wsi->u.hdr.ah);
1451
1452                 n = lws_http_action(wsi);
1453
1454                 return n;
1455
1456 #ifdef LWS_USE_HTTP2
1457 upgrade_h2c:
1458                 if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP2_SETTINGS)) {
1459                         lwsl_info("missing http2_settings\n");
1460                         goto bail_nuke_ah;
1461                 }
1462
1463                 lwsl_info("h2c upgrade...\n");
1464
1465                 p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP2_SETTINGS);
1466                 /* convert the peer's HTTP-Settings */
1467                 n = lws_b64_decode_string(p, protocol_list,
1468                                           sizeof(protocol_list));
1469                 if (n < 0) {
1470                         lwsl_parser("HTTP2_SETTINGS too long\n");
1471                         return 1;
1472                 }
1473
1474                 /* adopt the header info */
1475
1476                 ah = wsi->u.hdr.ah;
1477
1478                 lws_union_transition(wsi, LWSCM_HTTP2_SERVING);
1479
1480                 /* http2 union member has http union struct at start */
1481                 wsi->u.http.ah = ah;
1482
1483                 lws_http2_init(&wsi->u.http2.peer_settings);
1484                 lws_http2_init(&wsi->u.http2.my_settings);
1485
1486                 /* HTTP2 union */
1487
1488                 lws_http2_interpret_settings_payload(&wsi->u.http2.peer_settings,
1489                                 (unsigned char *)protocol_list, n);
1490
1491                 strcpy(protocol_list,
1492                        "HTTP/1.1 101 Switching Protocols\x0d\x0a"
1493                       "Connection: Upgrade\x0d\x0a"
1494                       "Upgrade: h2c\x0d\x0a\x0d\x0a");
1495                 n = lws_issue_raw(wsi, (unsigned char *)protocol_list,
1496                                         strlen(protocol_list));
1497                 if (n != strlen(protocol_list)) {
1498                         lwsl_debug("http2 switch: ERROR writing to socket\n");
1499                         return 1;
1500                 }
1501
1502                 wsi->state = LWSS_HTTP2_AWAIT_CLIENT_PREFACE;
1503
1504                 return 0;
1505 #endif
1506
1507 upgrade_ws:
1508                 if (!wsi->protocol)
1509                         lwsl_err("NULL protocol at lws_read\n");
1510
1511                 /*
1512                  * It's websocket
1513                  *
1514                  * Select the first protocol we support from the list
1515                  * the client sent us.
1516                  *
1517                  * Copy it to remove header fragmentation
1518                  */
1519
1520                 if (lws_hdr_copy(wsi, protocol_list, sizeof(protocol_list) - 1,
1521                                  WSI_TOKEN_PROTOCOL) < 0) {
1522                         lwsl_err("protocol list too long");
1523                         goto bail_nuke_ah;
1524                 }
1525
1526                 protocol_len = lws_hdr_total_length(wsi, WSI_TOKEN_PROTOCOL);
1527                 protocol_list[protocol_len] = '\0';
1528                 p = protocol_list;
1529                 hit = 0;
1530
1531                 while (*p && !hit) {
1532                         n = 0;
1533                         non_space_char_found = 0;
1534                         while (n < sizeof(protocol_name) - 1 && *p &&
1535                                *p != ',') {
1536                                 // ignore leading spaces
1537                                 if (!non_space_char_found && *p == ' ') {
1538                                         n++;
1539                                         continue;
1540                                 }
1541                                 non_space_char_found = 1;
1542                                 protocol_name[n++] = *p++;
1543                         }
1544                         protocol_name[n] = '\0';
1545                         if (*p)
1546                                 p++;
1547
1548                         lwsl_info("checking %s\n", protocol_name);
1549
1550                         n = 0;
1551                         while (wsi->vhost->protocols[n].callback) {
1552                                 lwsl_info("try %s\n", wsi->vhost->protocols[n].name);
1553
1554                                 if (wsi->vhost->protocols[n].name &&
1555                                     !strcmp(wsi->vhost->protocols[n].name,
1556                                             protocol_name)) {
1557                                         wsi->protocol = &wsi->vhost->protocols[n];
1558                                         hit = 1;
1559                                         break;
1560                                 }
1561
1562                                 n++;
1563                         }
1564                 }
1565
1566                 /* we didn't find a protocol he wanted? */
1567
1568                 if (!hit) {
1569                         if (lws_hdr_simple_ptr(wsi, WSI_TOKEN_PROTOCOL)) {
1570                                 lwsl_info("No protocol from \"%s\" supported\n",
1571                                          protocol_list);
1572                                 goto bail_nuke_ah;
1573                         }
1574                         /*
1575                          * some clients only have one protocol and
1576                          * do not send the protocol list header...
1577                          * allow it and match to the vhost's default
1578                          * protocol (which itself defaults to zero)
1579                          */
1580                         lwsl_info("defaulting to prot handler %d\n",
1581                                 wsi->vhost->default_protocol_index);
1582                         n = wsi->vhost->default_protocol_index;
1583                         wsi->protocol = &wsi->vhost->protocols[
1584                                       (int)wsi->vhost->default_protocol_index];
1585                 }
1586
1587                 /* allocate wsi->user storage */
1588                 if (lws_ensure_user_space(wsi))
1589                         goto bail_nuke_ah;
1590
1591                 /*
1592                  * Give the user code a chance to study the request and
1593                  * have the opportunity to deny it
1594                  */
1595                 if ((wsi->protocol->callback)(wsi,
1596                                 LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION,
1597                                 wsi->user_space,
1598                               lws_hdr_simple_ptr(wsi, WSI_TOKEN_PROTOCOL), 0)) {
1599                         lwsl_warn("User code denied connection\n");
1600                         goto bail_nuke_ah;
1601                 }
1602
1603                 /*
1604                  * Perform the handshake according to the protocol version the
1605                  * client announced
1606                  */
1607
1608                 switch (wsi->ietf_spec_revision) {
1609                 case 13:
1610                         lwsl_parser("lws_parse calling handshake_04\n");
1611                         if (handshake_0405(context, wsi)) {
1612                                 lwsl_info("hs0405 has failed the connection\n");
1613                                 goto bail_nuke_ah;
1614                         }
1615                         break;
1616
1617                 default:
1618                         lwsl_info("Unknown client spec version %d\n",
1619                                   wsi->ietf_spec_revision);
1620                         goto bail_nuke_ah;
1621                 }
1622
1623                 lws_same_vh_protocol_insert(wsi, n);
1624
1625                 /* we are upgrading to ws, so http/1.1 and keepalive +
1626                  * pipelined header considerations about keeping the ah around
1627                  * no longer apply.  However it's common for the first ws
1628                  * protocol data to have been coalesced with the browser
1629                  * upgrade request and to already be in the ah rx buffer.
1630                  */
1631
1632                 lwsl_info("%s: %p: inheriting ah in ws mode (rxpos:%d, rxlen:%d)\n",
1633                           __func__, wsi, wsi->u.hdr.ah->rxpos,
1634                           wsi->u.hdr.ah->rxlen);
1635                 lws_pt_lock(pt);
1636                 hdr = wsi->u.hdr;
1637
1638                 lws_union_transition(wsi, LWSCM_WS_SERVING);
1639                 /*
1640                  * first service is WS mode will notice this, use the RX and
1641                  * then detach the ah (caution: we are not in u.hdr union
1642                  * mode any more then... ah_temp member is at start the same
1643                  * though)
1644                  *
1645                  * Because rxpos/rxlen shows something in the ah, we will get
1646                  * service guaranteed next time around the event loop
1647                  *
1648                  * All union members begin with hdr, so we can use it even
1649                  * though we transitioned to ws union mode (the ah detach
1650                  * code uses it anyway).
1651                  */
1652                 wsi->u.hdr = hdr;
1653                 lws_pt_unlock(pt);
1654
1655                 lws_restart_ws_ping_pong_timer(wsi);
1656
1657                 /*
1658                  * create the frame buffer for this connection according to the
1659                  * size mentioned in the protocol definition.  If 0 there, use
1660                  * a big default for compatibility
1661                  */
1662
1663                 n = wsi->protocol->rx_buffer_size;
1664                 if (!n)
1665                         n = context->pt_serv_buf_size;
1666                 n += LWS_PRE;
1667                 wsi->u.ws.rx_ubuf = lws_malloc(n + 4 /* 0x0000ffff zlib */);
1668                 if (!wsi->u.ws.rx_ubuf) {
1669                         lwsl_err("Out of Mem allocating rx buffer %d\n", n);
1670                         return 1;
1671                 }
1672                 wsi->u.ws.rx_ubuf_alloc = n;
1673                 lwsl_debug("Allocating RX buffer %d\n", n);
1674 #if LWS_POSIX && !defined(LWS_WITH_ESP32)
1675                 if (setsockopt(wsi->desc.sockfd, SOL_SOCKET, SO_SNDBUF,
1676                                (const char *)&n, sizeof n)) {
1677                         lwsl_warn("Failed to set SNDBUF to %d", n);
1678                         return 1;
1679                 }
1680 #endif
1681
1682                 lwsl_parser("accepted v%02d connection\n",
1683                             wsi->ietf_spec_revision);
1684
1685                 /* notify user code that we're ready to roll */
1686
1687                 if (wsi->protocol->callback)
1688                         if (wsi->protocol->callback(wsi, LWS_CALLBACK_ESTABLISHED,
1689                                                     wsi->user_space,
1690 #ifdef LWS_OPENSSL_SUPPORT
1691                                                     wsi->ssl,
1692 #else
1693                                                     NULL,
1694 #endif
1695                                                     0))
1696                                 return 1;
1697
1698                 /* !!! drop ah unreservedly after ESTABLISHED */
1699                 if (!wsi->more_rx_waiting) {
1700                         wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
1701
1702                         //lwsl_notice("%p: dropping ah EST\n", wsi);
1703                         lws_header_table_detach(wsi, 1);
1704                 }
1705
1706                 return 0;
1707         } /* while all chars are handled */
1708
1709         return 0;
1710
1711 bail_nuke_ah:
1712         /* drop the header info */
1713         /* we're closing, losing some rx is OK */
1714         wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
1715         //lwsl_notice("%s: drop2\n", __func__);
1716         lws_header_table_detach(wsi, 1);
1717
1718         return 1;
1719 }
1720
1721 static int
1722 lws_get_idlest_tsi(struct lws_context *context)
1723 {
1724         unsigned int lowest = ~0;
1725         int n = 0, hit = -1;
1726
1727         for (; n < context->count_threads; n++) {
1728                 if ((unsigned int)context->pt[n].fds_count !=
1729                     context->fd_limit_per_thread - 1 &&
1730                     (unsigned int)context->pt[n].fds_count < lowest) {
1731                         lowest = context->pt[n].fds_count;
1732                         hit = n;
1733                 }
1734         }
1735
1736         return hit;
1737 }
1738
1739 struct lws *
1740 lws_create_new_server_wsi(struct lws_vhost *vhost)
1741 {
1742         struct lws *new_wsi;
1743         int n = lws_get_idlest_tsi(vhost->context);
1744
1745         if (n < 0) {
1746                 lwsl_err("no space for new conn\n");
1747                 return NULL;
1748         }
1749
1750         new_wsi = lws_zalloc(sizeof(struct lws));
1751         if (new_wsi == NULL) {
1752                 lwsl_err("Out of memory for new connection\n");
1753                 return NULL;
1754         }
1755
1756         new_wsi->tsi = n;
1757         lwsl_debug("Accepted wsi %p to context %p, tsi %d\n", new_wsi,
1758                     vhost->context, new_wsi->tsi);
1759
1760         new_wsi->vhost = vhost;
1761         new_wsi->context = vhost->context;
1762         new_wsi->pending_timeout = NO_PENDING_TIMEOUT;
1763         new_wsi->rxflow_change_to = LWS_RXFLOW_ALLOW;
1764
1765         /* initialize the instance struct */
1766
1767         new_wsi->state = LWSS_HTTP;
1768         new_wsi->mode = LWSCM_HTTP_SERVING;
1769         new_wsi->hdr_parsing_completed = 0;
1770
1771 #ifdef LWS_OPENSSL_SUPPORT
1772         new_wsi->use_ssl = LWS_SSL_ENABLED(vhost);
1773 #endif
1774
1775         /*
1776          * these can only be set once the protocol is known
1777          * we set an unestablished connection's protocol pointer
1778          * to the start of the supported list, so it can look
1779          * for matching ones during the handshake
1780          */
1781         new_wsi->protocol = vhost->protocols;
1782         new_wsi->user_space = NULL;
1783         new_wsi->ietf_spec_revision = 0;
1784         new_wsi->desc.sockfd = LWS_SOCK_INVALID;
1785         vhost->context->count_wsi_allocated++;
1786
1787         /*
1788          * outermost create notification for wsi
1789          * no user_space because no protocol selection
1790          */
1791         vhost->protocols[0].callback(new_wsi, LWS_CALLBACK_WSI_CREATE,
1792                                        NULL, NULL, 0);
1793
1794         return new_wsi;
1795 }
1796
1797 LWS_VISIBLE int LWS_WARN_UNUSED_RESULT
1798 lws_http_transaction_completed(struct lws *wsi)
1799 {
1800         int n = NO_PENDING_TIMEOUT;
1801
1802         lws_access_log(wsi);
1803
1804         if (!wsi->hdr_parsing_completed) {
1805                 lwsl_notice("%s: ignoring, ah parsing incomplete\n", __func__);
1806                 return 0;
1807         }
1808
1809         lwsl_notice("%s: wsi %p\n", __func__, wsi);
1810         /* if we can't go back to accept new headers, drop the connection */
1811         if (wsi->u.http.connection_type != HTTP_CONNECTION_KEEP_ALIVE) {
1812                 lwsl_info("%s: %p: close connection\n", __func__, wsi);
1813                 return 1;
1814         }
1815
1816         if (lws_bind_protocol(wsi, &wsi->vhost->protocols[0]))
1817                 return 1;
1818
1819         /* otherwise set ourselves up ready to go again */
1820         wsi->state = LWSS_HTTP;
1821         wsi->mode = LWSCM_HTTP_SERVING;
1822         wsi->u.http.content_length = 0;
1823         wsi->u.http.content_remain = 0;
1824         wsi->hdr_parsing_completed = 0;
1825 #ifdef LWS_WITH_ACCESS_LOG
1826         wsi->access_log.sent = 0;
1827 #endif
1828
1829         if (wsi->vhost->keepalive_timeout)
1830                 n = PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE;
1831         lws_set_timeout(wsi, n, wsi->vhost->keepalive_timeout);
1832
1833         /*
1834          * We already know we are on http1.1 / keepalive and the next thing
1835          * coming will be another header set.
1836          *
1837          * If there is no pending rx and we still have the ah, drop it and
1838          * reacquire a new ah when the new headers start to arrive.  (Otherwise
1839          * we needlessly hog an ah indefinitely.)
1840          *
1841          * However if there is pending rx and we know from the keepalive state
1842          * that is already at least the start of another header set, simply
1843          * reset the existing header table and keep it.
1844          */
1845         if (wsi->u.hdr.ah) {
1846                 lwsl_info("%s: wsi->more_rx_waiting=%d\n", __func__,
1847                                 wsi->more_rx_waiting);
1848
1849                 if (!wsi->more_rx_waiting) {
1850                         wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
1851                         lws_header_table_detach(wsi, 1);
1852 #ifdef LWS_OPENSSL_SUPPORT
1853                         /*
1854                          * additionally... if we are hogging an SSL instance
1855                          * with no pending pipelined headers (or ah now), and
1856                          * SSL is scarce, drop this connection without waiting
1857                          */
1858
1859                         if (wsi->vhost->use_ssl &&
1860                             wsi->context->simultaneous_ssl_restriction &&
1861                             wsi->context->simultaneous_ssl ==
1862                                    wsi->context->simultaneous_ssl_restriction) {
1863                                 lwsl_info("%s: simultaneous_ssl_restriction and nothing pipelined\n", __func__);
1864                                 return 1;
1865                         }
1866 #endif
1867                 } else
1868                         lws_header_table_reset(wsi, 1);
1869         }
1870
1871         /* If we're (re)starting on headers, need other implied init */
1872         wsi->u.hdr.ues = URIES_IDLE;
1873
1874         lwsl_info("%s: %p: keep-alive await new transaction\n", __func__, wsi);
1875
1876         return 0;
1877 }
1878
1879 /* if not a socket, it's a raw, non-ssl file descriptor */
1880
1881 LWS_VISIBLE struct lws *
1882 lws_adopt_descriptor_vhost(struct lws_vhost *vh, lws_adoption_type type,
1883                            lws_sock_file_fd_type fd, const char *vh_prot_name,
1884                            struct lws *parent)
1885 {
1886         struct lws_context *context = vh->context;
1887         struct lws *new_wsi = lws_create_new_server_wsi(vh);
1888         struct lws_context_per_thread *pt;
1889         int n, ssl = 0;
1890
1891         if (!new_wsi) {
1892                 if (type & LWS_ADOPT_SOCKET)
1893                         compatible_close(fd.sockfd);
1894                 return NULL;
1895         }
1896         pt = &context->pt[(int)new_wsi->tsi];
1897         lws_stats_atomic_bump(context, pt, LWSSTATS_C_CONNECTIONS, 1);
1898
1899         if (parent) {
1900                 new_wsi->parent = parent;
1901                 new_wsi->sibling_list = parent->child_list;
1902                 parent->child_list = new_wsi;
1903         }
1904
1905         new_wsi->desc = fd;
1906
1907         if (vh_prot_name) {
1908                 new_wsi->protocol = lws_vhost_name_to_protocol(new_wsi->vhost,
1909                                                                vh_prot_name);
1910                 if (!new_wsi->protocol) {
1911                         lwsl_err("Protocol %s not enabled on vhost %s\n",
1912                                  vh_prot_name, new_wsi->vhost->name);
1913                         goto bail;
1914                 }
1915                if (lws_ensure_user_space(new_wsi)) {
1916                        lwsl_notice("OOM trying to get user_space\n");
1917                         goto bail;
1918                }
1919         } else
1920                 if (type & LWS_ADOPT_HTTP) /* he will transition later */
1921                         new_wsi->protocol =
1922                                 &vh->protocols[vh->default_protocol_index];
1923                 else { /* this is the only time he will transition */
1924                         lws_bind_protocol(new_wsi,
1925                                 &vh->protocols[vh->raw_protocol_index]);
1926                         lws_union_transition(new_wsi, LWSCM_RAW);
1927                 }
1928
1929         if (type & LWS_ADOPT_SOCKET) { /* socket desc */
1930                 lwsl_debug("%s: new wsi %p, sockfd %d\n", __func__, new_wsi,
1931                            (int)(size_t)fd.sockfd);
1932
1933                 if (type & LWS_ADOPT_HTTP)
1934                         /* the transport is accepted...
1935                          * give him time to negotiate */
1936                         lws_set_timeout(new_wsi,
1937                                         PENDING_TIMEOUT_ESTABLISH_WITH_SERVER,
1938                                         context->timeout_secs);
1939
1940 #if LWS_POSIX == 0
1941 #if defined(LWS_WITH_ESP8266)
1942                 esp8266_tcp_stream_accept(accept_fd, new_wsi);
1943 #endif
1944 #endif
1945         } else /* file desc */
1946                 lwsl_debug("%s: new wsi %p, filefd %d\n", __func__, new_wsi,
1947                            (int)(size_t)fd.filefd);
1948
1949         /*
1950          * A new connection was accepted. Give the user a chance to
1951          * set properties of the newly created wsi. There's no protocol
1952          * selected yet so we issue this to the vhosts's default protocol,
1953          * itself by default protocols[0]
1954          */
1955         n = LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED;
1956         if (!(type & LWS_ADOPT_HTTP)) {
1957                 if (!(type & LWS_ADOPT_SOCKET))
1958                         n = LWS_CALLBACK_RAW_ADOPT_FILE;
1959                 else
1960                         n = LWS_CALLBACK_RAW_ADOPT;
1961         }
1962
1963         if (!LWS_SSL_ENABLED(new_wsi->vhost) || !(type & LWS_ADOPT_ALLOW_SSL) ||
1964             !(type & LWS_ADOPT_SOCKET)) {
1965                 /* non-SSL */
1966                 if (!(type & LWS_ADOPT_HTTP)) {
1967                         if (!(type & LWS_ADOPT_SOCKET))
1968                                 new_wsi->mode = LWSCM_RAW_FILEDESC;
1969                         else
1970                                 new_wsi->mode = LWSCM_RAW;
1971                 }
1972         } else {
1973                 /* SSL */
1974                 if (!(type & LWS_ADOPT_HTTP))
1975                         new_wsi->mode = LWSCM_SSL_INIT_RAW;
1976                 else
1977                         new_wsi->mode = LWSCM_SSL_INIT;
1978
1979                 ssl = 1;
1980         }
1981
1982         lws_libev_accept(new_wsi, new_wsi->desc);
1983         lws_libuv_accept(new_wsi, new_wsi->desc);
1984         lws_libevent_accept(new_wsi, new_wsi->desc);
1985
1986         if (!ssl) {
1987                 if (insert_wsi_socket_into_fds(context, new_wsi)) {
1988                         lwsl_err("%s: fail inserting socket\n", __func__);
1989                         goto fail;
1990                 }
1991         } else
1992                 if (lws_server_socket_service_ssl(new_wsi, fd.sockfd)) {
1993                         lwsl_err("%s: fail ssl negotiation\n", __func__);
1994                         goto fail;
1995                 }
1996
1997         /*
1998          *  by deferring callback to this point, after insertion to fds,
1999          * lws_callback_on_writable() can work from the callback
2000          */
2001         if ((new_wsi->protocol->callback)(
2002                         new_wsi, n, new_wsi->user_space, NULL, 0))
2003                 goto fail;
2004
2005         if (type & LWS_ADOPT_HTTP) {
2006                 if (!lws_header_table_attach(new_wsi, 0)) {
2007                         lwsl_debug("Attached ah immediately\n");
2008                 } else {
2009                         lwsl_notice("%s: waiting for ah\n", __func__);
2010                 }
2011         }
2012
2013         return new_wsi;
2014
2015 fail:
2016         if (type & LWS_ADOPT_SOCKET)
2017                 lws_close_free_wsi(new_wsi, LWS_CLOSE_STATUS_NOSTATUS);
2018
2019         return NULL;
2020
2021 bail:
2022        lwsl_notice("%s: exiting on bail\n", __func__);
2023         if (parent)
2024                 parent->child_list = new_wsi->sibling_list;
2025         if (new_wsi->user_space)
2026                 lws_free(new_wsi->user_space);
2027         lws_free(new_wsi);
2028        compatible_close(fd.sockfd);
2029
2030         return NULL;
2031 }
2032
2033 LWS_VISIBLE struct lws *
2034 lws_adopt_socket_vhost(struct lws_vhost *vh, lws_sockfd_type accept_fd)
2035 {
2036         lws_sock_file_fd_type fd;
2037
2038         fd.sockfd = accept_fd;
2039         return lws_adopt_descriptor_vhost(vh, LWS_ADOPT_SOCKET |
2040                         LWS_ADOPT_HTTP | LWS_ADOPT_ALLOW_SSL, fd, NULL, NULL);
2041 }
2042
2043 LWS_VISIBLE struct lws *
2044 lws_adopt_socket(struct lws_context *context, lws_sockfd_type accept_fd)
2045 {
2046         return lws_adopt_socket_vhost(context->vhost_list, accept_fd);
2047 }
2048
2049 /* Common read-buffer adoption for lws_adopt_*_readbuf */
2050 static struct lws*
2051 adopt_socket_readbuf(struct lws *wsi, const char *readbuf, size_t len)
2052 {
2053         struct lws_context_per_thread *pt;
2054         struct allocated_headers *ah;
2055         struct lws_pollfd *pfd;
2056
2057         if (!wsi)
2058                 return NULL;
2059
2060         if (!readbuf || len == 0)
2061                 return wsi;
2062
2063         if (len > sizeof(ah->rx)) {
2064                 lwsl_err("%s: rx in too big\n", __func__);
2065                 goto bail;
2066         }
2067
2068         /*
2069          * we can't process the initial read data until we can attach an ah.
2070          *
2071          * if one is available, get it and place the data in his ah rxbuf...
2072          * wsi with ah that have pending rxbuf get auto-POLLIN service.
2073          *
2074          * no autoservice because we didn't get a chance to attach the
2075          * readbuf data to wsi or ah yet, and we will do it next if we get
2076          * the ah.
2077          */
2078         if (wsi->u.hdr.ah || !lws_header_table_attach(wsi, 0)) {
2079                 ah = wsi->u.hdr.ah;
2080                 memcpy(ah->rx, readbuf, len);
2081                 ah->rxpos = 0;
2082                 ah->rxlen = len;
2083
2084                 lwsl_notice("%s: calling service on readbuf ah\n", __func__);
2085                 pt = &wsi->context->pt[(int)wsi->tsi];
2086
2087                 /* unlike a normal connect, we have the headers already
2088                  * (or the first part of them anyway).
2089                  * libuv won't come back and service us without a network
2090                  * event, so we need to do the header service right here.
2091                  */
2092                 pfd = &pt->fds[wsi->position_in_fds_table];
2093                 pfd->revents |= LWS_POLLIN;
2094                 lwsl_err("%s: calling service\n", __func__);
2095                 if (lws_service_fd_tsi(wsi->context, pfd, wsi->tsi))
2096                         /* service closed us */
2097                         return NULL;
2098
2099                 return wsi;
2100         }
2101         lwsl_err("%s: deferring handling ah\n", __func__);
2102         /*
2103          * hum if no ah came, we are on the wait list and must defer
2104          * dealing with this until the ah arrives.
2105          *
2106          * later successful lws_header_table_attach() will apply the
2107          * below to the rx buffer (via lws_header_table_reset()).
2108          */
2109         wsi->u.hdr.preamble_rx = lws_malloc(len);
2110         if (!wsi->u.hdr.preamble_rx) {
2111                 lwsl_err("OOM\n");
2112                 goto bail;
2113         }
2114         memcpy(wsi->u.hdr.preamble_rx, readbuf, len);
2115         wsi->u.hdr.preamble_rx_len = len;
2116
2117         return wsi;
2118
2119 bail:
2120         lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
2121
2122         return NULL;
2123 }
2124
2125 LWS_VISIBLE struct lws *
2126 lws_adopt_socket_readbuf(struct lws_context *context, lws_sockfd_type accept_fd,
2127                          const char *readbuf, size_t len)
2128 {
2129         return adopt_socket_readbuf(lws_adopt_socket(context, accept_fd), readbuf, len);
2130 }
2131
2132 LWS_VISIBLE struct lws *
2133 lws_adopt_socket_vhost_readbuf(struct lws_vhost *vhost, lws_sockfd_type accept_fd,
2134                          const char *readbuf, size_t len)
2135 {
2136         return adopt_socket_readbuf(lws_adopt_socket_vhost(vhost, accept_fd), readbuf, len);
2137 }
2138
2139 LWS_VISIBLE int
2140 lws_server_socket_service(struct lws_context *context, struct lws *wsi,
2141                           struct lws_pollfd *pollfd)
2142 {
2143         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
2144         lws_sockfd_type accept_fd = LWS_SOCK_INVALID;
2145         struct allocated_headers *ah;
2146         lws_sock_file_fd_type fd;
2147         int opts = LWS_ADOPT_SOCKET | LWS_ADOPT_ALLOW_SSL;
2148 #if LWS_POSIX
2149         struct sockaddr_storage cli_addr;
2150         socklen_t clilen;
2151 #endif
2152         int n, len;
2153
2154         // lwsl_notice("%s: mode %d\n", __func__, wsi->mode);
2155
2156         switch (wsi->mode) {
2157
2158         case LWSCM_HTTP_SERVING:
2159         case LWSCM_HTTP_SERVING_ACCEPTED:
2160         case LWSCM_HTTP2_SERVING:
2161         case LWSCM_RAW:
2162
2163                 /* handle http headers coming in */
2164
2165                 /* pending truncated sends have uber priority */
2166
2167                 if (wsi->trunc_len) {
2168                         if (!(pollfd->revents & LWS_POLLOUT))
2169                                 break;
2170
2171                         if (lws_issue_raw(wsi, wsi->trunc_alloc +
2172                                                wsi->trunc_offset,
2173                                           wsi->trunc_len) < 0)
2174                                 goto fail;
2175                         /*
2176                          * we can't afford to allow input processing to send
2177                          * something new, so spin around he event loop until
2178                          * he doesn't have any partials
2179                          */
2180                         break;
2181                 }
2182
2183                 /* any incoming data ready? */
2184
2185                 if (!(pollfd->revents & pollfd->events & LWS_POLLIN))
2186                         goto try_pollout;
2187
2188                 /*
2189                  * If we previously just did POLLIN when IN and OUT were
2190                  * signalled (because POLLIN processing may have used up
2191                  * the POLLOUT), don't let that happen twice in a row...
2192                  * next time we see the situation favour POLLOUT
2193                  */
2194 #if !defined(LWS_WITH_ESP8266)
2195                 if (wsi->favoured_pollin &&
2196                     (pollfd->revents & pollfd->events & LWS_POLLOUT)) {
2197                         wsi->favoured_pollin = 0;
2198                         goto try_pollout;
2199                 }
2200 #endif
2201
2202                 /* these states imply we MUST have an ah attached */
2203
2204                 if (wsi->mode != LWSCM_RAW && (wsi->state == LWSS_HTTP ||
2205                     wsi->state == LWSS_HTTP_ISSUING_FILE ||
2206                     wsi->state == LWSS_HTTP_HEADERS)) {
2207                         if (!wsi->u.hdr.ah) {
2208
2209                                 //lwsl_err("wsi %p: missing ah\n", wsi);
2210                                 /* no autoservice beacuse we will do it next */
2211                                 if (lws_header_table_attach(wsi, 0)) {
2212                                         lwsl_info("wsi %p: failed to acquire ah\n", wsi);
2213                                         goto try_pollout;
2214                                 }
2215                         }
2216                         ah = wsi->u.hdr.ah;
2217
2218                         //lwsl_notice("%s: %p: rxpos:%d rxlen:%d\n", __func__, wsi,
2219                         //         ah->rxpos, ah->rxlen);
2220
2221                         /* if nothing in ah rx buffer, get some fresh rx */
2222                         if (ah->rxpos == ah->rxlen) {
2223                                 ah->rxlen = lws_ssl_capable_read(wsi, ah->rx,
2224                                                    sizeof(ah->rx));
2225                                 ah->rxpos = 0;
2226                                 //lwsl_notice("%s: wsi %p, ah->rxlen = %d\r\n",
2227                                 //         __func__, wsi, ah->rxlen);
2228                                 switch (ah->rxlen) {
2229                                 case 0:
2230                                         lwsl_info("%s: read 0 len\n", __func__);
2231                                         /* lwsl_info("   state=%d\n", wsi->state); */
2232 //                                      if (!wsi->hdr_parsing_completed)
2233 //                                              lws_header_table_detach(wsi);
2234                                         /* fallthru */
2235                                 case LWS_SSL_CAPABLE_ERROR:
2236                                         goto fail;
2237                                 case LWS_SSL_CAPABLE_MORE_SERVICE:
2238                                         ah->rxlen = ah->rxpos = 0;
2239                                         goto try_pollout;
2240                                 }
2241                         }
2242
2243                         if (!(ah->rxpos != ah->rxlen && ah->rxlen)) {
2244                                 lwsl_err("%s: assert: rxpos %d, rxlen %d\n",
2245                                          __func__, ah->rxpos, ah->rxlen);
2246
2247                                 assert(0);
2248                         }
2249
2250                         /* just ignore incoming if waiting for close */
2251                         if (wsi->state != LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE &&
2252                             wsi->state != LWSS_HTTP_ISSUING_FILE) {
2253                                 n = lws_read(wsi, ah->rx + ah->rxpos,
2254                                              ah->rxlen - ah->rxpos);
2255                                 if (n < 0) /* we closed wsi */
2256                                         return 1;
2257                                 if (wsi->u.hdr.ah) {
2258                                         if ( wsi->u.hdr.ah->rxlen)
2259                                                  wsi->u.hdr.ah->rxpos += n;
2260
2261                                         lwsl_debug("%s: wsi %p: ah read rxpos %d, rxlen %d\n", __func__, wsi, wsi->u.hdr.ah->rxpos, wsi->u.hdr.ah->rxlen);
2262
2263                                         if (wsi->u.hdr.ah->rxpos == wsi->u.hdr.ah->rxlen &&
2264                                             (wsi->mode != LWSCM_HTTP_SERVING &&
2265                                              wsi->mode != LWSCM_HTTP_SERVING_ACCEPTED &&
2266                                              wsi->mode != LWSCM_HTTP2_SERVING))
2267                                                 lws_header_table_detach(wsi, 1);
2268                                 }
2269                                 break;
2270                         }
2271
2272                         goto try_pollout;
2273                 }
2274
2275                 len = lws_ssl_capable_read(wsi, pt->serv_buf,
2276                                            context->pt_serv_buf_size);
2277                 lwsl_debug("%s: wsi %p read %d\r\n", __func__, wsi, len);
2278                 switch (len) {
2279                 case 0:
2280                         lwsl_info("%s: read 0 len\n", __func__);
2281                         /* lwsl_info("   state=%d\n", wsi->state); */
2282 //                      if (!wsi->hdr_parsing_completed)
2283 //                              lws_header_table_detach(wsi);
2284                         /* fallthru */
2285                 case LWS_SSL_CAPABLE_ERROR:
2286                         goto fail;
2287                 case LWS_SSL_CAPABLE_MORE_SERVICE:
2288                         goto try_pollout;
2289                 }
2290
2291                 if (wsi->mode == LWSCM_RAW) {
2292                         n = user_callback_handle_rxflow(wsi->protocol->callback,
2293                                         wsi, LWS_CALLBACK_RAW_RX,
2294                                         wsi->user_space, pt->serv_buf, len);
2295                         if (n < 0) {
2296                                 lwsl_info("LWS_CALLBACK_RAW_RX_fail\n");
2297                                 goto fail;
2298                         }
2299                         goto try_pollout;
2300                 }
2301
2302                 /* just ignore incoming if waiting for close */
2303                 if (wsi->state != LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE &&
2304                     wsi->state != LWSS_HTTP_ISSUING_FILE) {
2305                         /*
2306                          * this may want to send
2307                          * (via HTTP callback for example)
2308                          */
2309                         n = lws_read(wsi, pt->serv_buf, len);
2310                         if (n < 0) /* we closed wsi */
2311                                 return 1;
2312                         /*
2313                          *  he may have used up the
2314                          * writability above, if we will defer POLLOUT
2315                          * processing in favour of POLLIN, note it
2316                          */
2317                         if (pollfd->revents & LWS_POLLOUT)
2318                                 wsi->favoured_pollin = 1;
2319                         break;
2320                 }
2321
2322 try_pollout:
2323
2324                 /* this handles POLLOUT for http serving fragments */
2325
2326                 if (!(pollfd->revents & LWS_POLLOUT))
2327                         break;
2328
2329                 /* one shot */
2330                 if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
2331                         lwsl_notice("%s a\n", __func__);
2332                         goto fail;
2333                 }
2334
2335                 if (wsi->mode == LWSCM_RAW) {
2336                         lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_C_WRITEABLE_CB, 1);
2337 #if defined(LWS_WITH_STATS)
2338                         {
2339                                 uint64_t ul = time_in_microseconds() - wsi->active_writable_req_us;
2340
2341                                 lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_MS_WRITABLE_DELAY, ul);
2342                                 lws_stats_atomic_max(wsi->context, pt, LWSSTATS_MS_WORST_WRITABLE_DELAY, ul);
2343                                 wsi->active_writable_req_us = 0;
2344                         }
2345 #endif
2346                         n = user_callback_handle_rxflow(wsi->protocol->callback,
2347                                         wsi, LWS_CALLBACK_RAW_WRITEABLE,
2348                                         wsi->user_space, NULL, 0);
2349                         if (n < 0) {
2350                                 lwsl_info("writeable_fail\n");
2351                                 goto fail;
2352                         }
2353                         break;
2354                 }
2355
2356                 if (!wsi->hdr_parsing_completed)
2357                         break;
2358
2359                 if (wsi->state != LWSS_HTTP_ISSUING_FILE) {
2360
2361                         lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_C_WRITEABLE_CB, 1);
2362 #if defined(LWS_WITH_STATS)
2363                         {
2364                                 uint64_t ul = time_in_microseconds() - wsi->active_writable_req_us;
2365
2366                                 lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_MS_WRITABLE_DELAY, ul);
2367                                 lws_stats_atomic_max(wsi->context, pt, LWSSTATS_MS_WORST_WRITABLE_DELAY, ul);
2368                                 wsi->active_writable_req_us = 0;
2369                         }
2370 #endif
2371
2372                         n = user_callback_handle_rxflow(wsi->protocol->callback,
2373                                         wsi, LWS_CALLBACK_HTTP_WRITEABLE,
2374                                         wsi->user_space, NULL, 0);
2375                         if (n < 0) {
2376                                 lwsl_info("writeable_fail\n");
2377                                 goto fail;
2378                         }
2379                         break;
2380                 }
2381
2382                 /* >0 == completion, <0 == error */
2383                 n = lws_serve_http_file_fragment(wsi);
2384                 if (n < 0 || (n > 0 && lws_http_transaction_completed(wsi))) {
2385                         lwsl_info("completed\n");
2386                         goto fail;
2387                 }
2388
2389                 break;
2390
2391         case LWSCM_SERVER_LISTENER:
2392
2393 #if LWS_POSIX
2394                 /* pollin means a client has connected to us then */
2395
2396                 do {
2397                         if (!(pollfd->revents & LWS_POLLIN) || !(pollfd->events & LWS_POLLIN))
2398                                 break;
2399
2400 #ifdef LWS_OPENSSL_SUPPORT
2401                         /*
2402                          * can we really accept it, with regards to SSL limit?
2403                          * another vhost may also have had POLLIN on his listener this
2404                          * round and used it up already
2405                          */
2406
2407                         if (wsi->vhost->use_ssl &&
2408                             context->simultaneous_ssl_restriction &&
2409                             context->simultaneous_ssl ==
2410                                           context->simultaneous_ssl_restriction)
2411                                 /* no... ignore it, he won't come again until we are
2412                                  * below the simultaneous_ssl_restriction limit and
2413                                  * POLLIN is enabled on him again
2414                                  */
2415                                 break;
2416 #endif
2417                         /* listen socket got an unencrypted connection... */
2418
2419                         clilen = sizeof(cli_addr);
2420                         lws_latency_pre(context, wsi);
2421                         accept_fd  = accept(pollfd->fd, (struct sockaddr *)&cli_addr,
2422                                             &clilen);
2423                         lws_latency(context, wsi, "listener accept", accept_fd,
2424                                     accept_fd >= 0);
2425                         if (accept_fd < 0) {
2426                                 if (LWS_ERRNO == LWS_EAGAIN ||
2427                                     LWS_ERRNO == LWS_EWOULDBLOCK) {
2428 //                                      lwsl_err("accept asks to try again\n");
2429                                         break;
2430                                 }
2431                                 lwsl_err("ERROR on accept: %s\n", strerror(LWS_ERRNO));
2432                                 break;
2433                         }
2434
2435                         lws_plat_set_socket_options(wsi->vhost, accept_fd);
2436
2437 #if defined(LWS_USE_IPV6)
2438                         lwsl_debug("accepted new conn port %u on fd=%d\n",
2439                                           ((cli_addr.ss_family == AF_INET6) ?
2440                                           ntohs(((struct sockaddr_in6 *) &cli_addr)->sin6_port) :
2441                                           ntohs(((struct sockaddr_in *) &cli_addr)->sin_port)),
2442                                           accept_fd);
2443 #else
2444                         lwsl_debug("accepted new conn port %u on fd=%d\n",
2445                                           ntohs(((struct sockaddr_in *) &cli_addr)->sin_port),
2446                                           accept_fd);
2447 #endif
2448
2449 #else
2450                         /* not very beautiful... */
2451                         accept_fd = (lws_sockfd_type)pollfd;
2452 #endif
2453                         /*
2454                          * look at who we connected to and give user code a chance
2455                          * to reject based on client IP.  There's no protocol selected
2456                          * yet so we issue this to protocols[0]
2457                          */
2458                         if ((wsi->vhost->protocols[0].callback)(wsi,
2459                                         LWS_CALLBACK_FILTER_NETWORK_CONNECTION,
2460                                         NULL, (void *)(long)accept_fd, 0)) {
2461                                 lwsl_debug("Callback denied network connection\n");
2462                                 compatible_close(accept_fd);
2463                                 break;
2464                         }
2465
2466                         if (!(wsi->vhost->options & LWS_SERVER_OPTION_ONLY_RAW))
2467                                 opts |= LWS_ADOPT_HTTP;
2468
2469                         fd.sockfd = accept_fd;
2470                         if (!lws_adopt_descriptor_vhost(wsi->vhost, opts, fd,
2471                                                         NULL, NULL))
2472                                 /* already closed cleanly as necessary */
2473                                 return 1;
2474
2475 #if LWS_POSIX
2476                 } while (pt->fds_count < context->fd_limit_per_thread - 1 &&
2477                          lws_poll_listen_fd(&pt->fds[wsi->position_in_fds_table]) > 0);
2478 #endif
2479                 return 0;
2480
2481         default:
2482                 break;
2483         }
2484
2485         if (!lws_server_socket_service_ssl(wsi, accept_fd))
2486                 return 0;
2487
2488 fail:
2489         lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
2490
2491         return 1;
2492 }
2493
2494 LWS_VISIBLE int
2495 lws_serve_http_file(struct lws *wsi, const char *file, const char *content_type,
2496                     const char *other_headers, int other_headers_len)
2497 {
2498         static const char * const intermediates[] = { "private", "public" };
2499         struct lws_context *context = lws_get_context(wsi);
2500         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
2501 #if defined(LWS_WITH_RANGES)
2502         struct lws_range_parsing *rp = &wsi->u.http.range;
2503 #endif
2504         char cache_control[50], *cc = "no-store";
2505         unsigned char *response = pt->serv_buf + LWS_PRE;
2506         unsigned char *p = response;
2507         unsigned char *end = p + context->pt_serv_buf_size - LWS_PRE;
2508         lws_filepos_t computed_total_content_length;
2509         int ret = 0, cclen = 8, n = HTTP_STATUS_OK;
2510         lws_fop_flags_t fflags = LWS_O_RDONLY;
2511 #if defined(LWS_WITH_RANGES)
2512         int ranges;
2513 #endif
2514         const struct lws_plat_file_ops *fops;
2515         const char *vpath;
2516
2517         /*
2518          * We either call the platform fops .open with first arg platform fops,
2519          * or we call fops_zip .open with first arg platform fops, and fops_zip
2520          * open will decide whether to switch to fops_zip or stay with fops_def.
2521          *
2522          * If wsi->u.http.fop_fd is already set, the caller already opened it
2523          */
2524         if (!wsi->u.http.fop_fd) {
2525                 fops = lws_vfs_select_fops(wsi->context->fops, file, &vpath);
2526                 fflags |= lws_vfs_prepare_flags(wsi);
2527                 wsi->u.http.fop_fd = fops->LWS_FOP_OPEN(wsi->context->fops,
2528                                                         file, vpath, &fflags);
2529                 if (!wsi->u.http.fop_fd) {
2530                         lwsl_err("Unable to open '%s'\n", file);
2531
2532                         return -1;
2533                 }
2534         }
2535         wsi->u.http.filelen = lws_vfs_get_length(wsi->u.http.fop_fd);
2536         computed_total_content_length = wsi->u.http.filelen;
2537
2538 #if defined(LWS_WITH_RANGES)
2539         ranges = lws_ranges_init(wsi, rp, wsi->u.http.filelen);
2540
2541         lwsl_debug("Range count %d\n", ranges);
2542         /*
2543          * no ranges -> 200;
2544          *  1 range  -> 206 + Content-Type: normal; Content-Range;
2545          *  more     -> 206 + Content-Type: multipart/byteranges
2546          *              Repeat the true Content-Type in each multipart header
2547          *              along with Content-Range
2548          */
2549         if (ranges < 0) {
2550                 /* it means he expressed a range in Range:, but it was illegal */
2551                 lws_return_http_status(wsi, HTTP_STATUS_REQ_RANGE_NOT_SATISFIABLE, NULL);
2552                 if (lws_http_transaction_completed(wsi))
2553                         return -1; /* <0 means just hang up */
2554
2555                 lws_vfs_file_close(&wsi->u.http.fop_fd);
2556
2557                 return 0; /* == 0 means we dealt with the transaction complete */
2558         }
2559         if (ranges)
2560                 n = HTTP_STATUS_PARTIAL_CONTENT;
2561 #endif
2562
2563         if (lws_add_http_header_status(wsi, n, &p, end))
2564                 return -1;
2565
2566         if ((wsi->u.http.fop_fd->flags & (LWS_FOP_FLAG_COMPR_ACCEPTABLE_GZIP |
2567                        LWS_FOP_FLAG_COMPR_IS_GZIP)) ==
2568             (LWS_FOP_FLAG_COMPR_ACCEPTABLE_GZIP | LWS_FOP_FLAG_COMPR_IS_GZIP)) {
2569                 if (lws_add_http_header_by_token(wsi,
2570                         WSI_TOKEN_HTTP_CONTENT_ENCODING,
2571                         (unsigned char *)"gzip", 4, &p, end))
2572                         return -1;
2573                 lwsl_info("file is being provided in gzip\n");
2574         }
2575
2576 #if defined(LWS_WITH_RANGES)
2577         if (ranges < 2 && content_type && content_type[0])
2578                 if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE,
2579                                                  (unsigned char *)content_type,
2580                                                  strlen(content_type), &p, end))
2581                         return -1;
2582
2583         if (ranges >= 2) { /* multipart byteranges */
2584                 strncpy(wsi->u.http.multipart_content_type, content_type,
2585                         sizeof(wsi->u.http.multipart_content_type) - 1);
2586                 wsi->u.http.multipart_content_type[
2587                          sizeof(wsi->u.http.multipart_content_type) - 1] = '\0';
2588                 if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE,
2589                                                  (unsigned char *)"multipart/byteranges; boundary=_lws",
2590                                                  20, &p, end))
2591                         return -1;
2592
2593                 /*
2594                  *  our overall content length has to include
2595                  *
2596                  *  - (n + 1) x "_lws\r\n"
2597                  *  - n x Content-Type: xxx/xxx\r\n
2598                  *  - n x Content-Range: bytes xxx-yyy/zzz\r\n
2599                  *  - n x /r/n
2600                  *  - the actual payloads (aggregated in rp->agg)
2601                  *
2602                  *  Precompute it for the main response header
2603                  */
2604
2605                 computed_total_content_length = (lws_filepos_t)rp->agg +
2606                                                 6 /* final _lws\r\n */;
2607
2608                 lws_ranges_reset(rp);
2609                 while (lws_ranges_next(rp)) {
2610                         n = lws_snprintf(cache_control, sizeof(cache_control),
2611                                         "bytes %llu-%llu/%llu",
2612                                         rp->start, rp->end, rp->extent);
2613
2614                         computed_total_content_length +=
2615                                         6 /* header _lws\r\n */ +
2616                                         14 + strlen(content_type) + 2 + /* Content-Type: xxx/xxx\r\n */
2617                                         15 + n + 2 + /* Content-Range: xxxx\r\n */
2618                                         2; /* /r/n */
2619                 }
2620
2621                 lws_ranges_reset(rp);
2622                 lws_ranges_next(rp);
2623         }
2624
2625         if (ranges == 1) {
2626                 computed_total_content_length = (lws_filepos_t)rp->agg;
2627                 n = lws_snprintf(cache_control, sizeof(cache_control), "bytes %llu-%llu/%llu",
2628                                 rp->start, rp->end, rp->extent);
2629
2630                 if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_RANGE,
2631                                                  (unsigned char *)cache_control,
2632                                                  n, &p, end))
2633                         return -1;
2634         }
2635
2636         wsi->u.http.range.inside = 0;
2637
2638         if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_ACCEPT_RANGES,
2639                                          (unsigned char *)"bytes", 5, &p, end))
2640                 return -1;
2641 #endif
2642
2643         if (!wsi->sending_chunked) {
2644                 if (lws_add_http_header_content_length(wsi,
2645                                                        computed_total_content_length,
2646                                                        &p, end))
2647                         return -1;
2648         } else {
2649                 if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_TRANSFER_ENCODING,
2650                                                  (unsigned char *)"chunked",
2651                                                  7, &p, end))
2652                         return -1;
2653         }
2654
2655         if (wsi->cache_secs && wsi->cache_reuse) {
2656                 if (wsi->cache_revalidate) {
2657                         cc = cache_control;
2658                         cclen = sprintf(cache_control, "%s max-age: %u",
2659                                     intermediates[wsi->cache_intermediaries],
2660                                     wsi->cache_secs);
2661                 } else {
2662                         cc = "no-cache";
2663                         cclen = 8;
2664                 }
2665         }
2666
2667         if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CACHE_CONTROL,
2668                         (unsigned char *)cc, cclen, &p, end))
2669                 return -1;
2670
2671         if (wsi->u.http.connection_type == HTTP_CONNECTION_KEEP_ALIVE)
2672                 if (lws_add_http_header_by_token(wsi, WSI_TOKEN_CONNECTION,
2673                                 (unsigned char *)"keep-alive", 10, &p, end))
2674                         return -1;
2675
2676         if (other_headers) {
2677                 if ((end - p) < other_headers_len)
2678                         return -1;
2679                 memcpy(p, other_headers, other_headers_len);
2680                 p += other_headers_len;
2681         }
2682
2683         if (lws_finalize_http_header(wsi, &p, end))
2684                 return -1;
2685
2686         ret = lws_write(wsi, response, p - response, LWS_WRITE_HTTP_HEADERS);
2687         if (ret != (p - response)) {
2688                 lwsl_err("_write returned %d from %ld\n", ret, (long)(p - response));
2689                 return -1;
2690         }
2691
2692         wsi->u.http.filepos = 0;
2693         wsi->state = LWSS_HTTP_ISSUING_FILE;
2694
2695         return lws_serve_http_file_fragment(wsi);
2696 }
2697
2698 int
2699 lws_interpret_incoming_packet(struct lws *wsi, unsigned char **buf, size_t len)
2700 {
2701         int m;
2702
2703         lwsl_parser("%s: received %d byte packet\n", __func__, (int)len);
2704 #if 0
2705         lwsl_hexdump(*buf, len);
2706 #endif
2707
2708         /* let the rx protocol state machine have as much as it needs */
2709
2710         while (len) {
2711                 /*
2712                  * we were accepting input but now we stopped doing so
2713                  */
2714                 if (!(wsi->rxflow_change_to & LWS_RXFLOW_ALLOW)) {
2715                         lws_rxflow_cache(wsi, *buf, 0, len);
2716                         lwsl_parser("%s: cached %ld\n", __func__, (long)len);
2717                         return 1;
2718                 }
2719
2720                 if (wsi->u.ws.rx_draining_ext) {
2721                         // lwsl_notice("draining with 0\n");
2722                         m = lws_rx_sm(wsi, 0);
2723                         if (m < 0)
2724                                 return -1;
2725                         continue;
2726                 }
2727
2728                 /* account for what we're using in rxflow buffer */
2729                 if (wsi->rxflow_buffer)
2730                         wsi->rxflow_pos++;
2731
2732                 /* consume payload bytes efficiently */
2733                 if (
2734                     wsi->lws_rx_parse_state ==
2735                     LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED) {
2736                         m = lws_payload_until_length_exhausted(wsi, buf, &len);
2737                         if (wsi->rxflow_buffer)
2738                                 wsi->rxflow_pos += m;
2739                 }
2740
2741                 /* process the byte */
2742                 m = lws_rx_sm(wsi, *(*buf)++);
2743                 if (m < 0)
2744                         return -1;
2745                 len--;
2746         }
2747
2748         lwsl_parser("%s: exit with %d unused\n", __func__, (int)len);
2749
2750         return 0;
2751 }
2752
2753 LWS_VISIBLE void
2754 lws_server_get_canonical_hostname(struct lws_context *context,
2755                                   struct lws_context_creation_info *info)
2756 {
2757         if (lws_check_opt(info->options, LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME))
2758                 return;
2759 #if LWS_POSIX && !defined(LWS_WITH_ESP32)
2760         /* find canonical hostname */
2761         gethostname((char *)context->canonical_hostname,
2762                     sizeof(context->canonical_hostname) - 1);
2763
2764         lwsl_notice(" canonical_hostname = %s\n", context->canonical_hostname);
2765 #else
2766         (void)context;
2767 #endif
2768 }
2769
2770 #define LWS_MAX_ELEM_NAME 32
2771
2772 enum urldecode_stateful {
2773         US_NAME,
2774         US_IDLE,
2775         US_PC1,
2776         US_PC2,
2777
2778         MT_LOOK_BOUND_IN,
2779         MT_HNAME,
2780         MT_DISP,
2781         MT_TYPE,
2782         MT_IGNORE1,
2783         MT_IGNORE2,
2784 };
2785
2786 static const char * const mp_hdr[] = {
2787         "content-disposition: ",
2788         "content-type: ",
2789         "\x0d\x0a"
2790 };
2791
2792 typedef int (*lws_urldecode_stateful_cb)(void *data,
2793                 const char *name, char **buf, int len, int final);
2794
2795 struct lws_urldecode_stateful {
2796         char *out;
2797         void *data;
2798         char name[LWS_MAX_ELEM_NAME];
2799         char temp[LWS_MAX_ELEM_NAME];
2800         char content_type[32];
2801         char content_disp[32];
2802         char content_disp_filename[256];
2803         char mime_boundary[128];
2804         int out_len;
2805         int pos;
2806         int hdr_idx;
2807         int mp;
2808         int sum;
2809
2810         unsigned int multipart_form_data:1;
2811         unsigned int inside_quote:1;
2812         unsigned int subname:1;
2813         unsigned int boundary_real_crlf:1;
2814
2815         enum urldecode_stateful state;
2816
2817         lws_urldecode_stateful_cb output;
2818 };
2819
2820 static struct lws_urldecode_stateful *
2821 lws_urldecode_s_create(struct lws *wsi, char *out, int out_len, void *data,
2822                        lws_urldecode_stateful_cb output)
2823 {
2824         struct lws_urldecode_stateful *s = lws_zalloc(sizeof(*s));
2825         char buf[200], *p;
2826         int m = 0;
2827
2828         if (!s)
2829                 return NULL;
2830
2831         s->out = out;
2832         s->out_len  = out_len;
2833         s->output = output;
2834         s->pos = 0;
2835         s->sum = 0;
2836         s->mp = 0;
2837         s->state = US_NAME;
2838         s->name[0] = '\0';
2839         s->data = data;
2840
2841         if (lws_hdr_copy(wsi, buf, sizeof(buf), WSI_TOKEN_HTTP_CONTENT_TYPE) > 0) {
2842                 /* multipart/form-data; boundary=----WebKitFormBoundarycc7YgAPEIHvgE9Bf */
2843
2844                 if (!strncmp(buf, "multipart/form-data", 19)) {
2845                         s->multipart_form_data = 1;
2846                         s->state = MT_LOOK_BOUND_IN;
2847                         s->mp = 2;
2848                         p = strstr(buf, "boundary=");
2849                         if (p) {
2850                                 p += 9;
2851                                 s->mime_boundary[m++] = '\x0d';
2852                                 s->mime_boundary[m++] = '\x0a';
2853                                 s->mime_boundary[m++] = '-';
2854                                 s->mime_boundary[m++] = '-';
2855                                 while (m < sizeof(s->mime_boundary) - 1 &&
2856                                        *p && *p != ' ')
2857                                         s->mime_boundary[m++] = *p++;
2858
2859                                 s->mime_boundary[m] = '\0';
2860
2861                                 lwsl_notice("boundary '%s'\n", s->mime_boundary);
2862                         }
2863                 }
2864         }
2865
2866         return s;
2867 }
2868
2869 static int
2870 lws_urldecode_s_process(struct lws_urldecode_stateful *s, const char *in, int len)
2871 {
2872         int n, m, hit = 0;
2873         char c, was_end = 0;
2874
2875         while (len--) {
2876                 if (s->pos == s->out_len - s->mp - 1) {
2877                         if (s->output(s->data, s->name, &s->out, s->pos, 0))
2878                                 return -1;
2879
2880                         was_end = s->pos;
2881                         s->pos = 0;
2882                 }
2883                 switch (s->state) {
2884
2885                 /* states for url arg style */
2886
2887                 case US_NAME:
2888                         s->inside_quote = 0;
2889                         if (*in == '=') {
2890                                 s->name[s->pos] = '\0';
2891                                 s->pos = 0;
2892                                 s->state = US_IDLE;
2893                                 in++;
2894                                 continue;
2895                         }
2896                         if (*in == '&') {
2897                                 s->name[s->pos] = '\0';
2898                                 if (s->output(s->data, s->name, &s->out, s->pos, 1))
2899                                         return -1;
2900                                 s->pos = 0;
2901                                 s->state = US_IDLE;
2902                                 in++;
2903                                 continue;
2904                         }
2905                         if (s->pos >= sizeof(s->name) - 1) {
2906                                 lwsl_notice("Name too long\n");
2907                                 return -1;
2908                         }
2909                         s->name[s->pos++] = *in++;
2910                         break;
2911                 case US_IDLE:
2912                         if (*in == '%') {
2913                                 s->state++;
2914                                 in++;
2915                                 continue;
2916                         }
2917                         if (*in == '&') {
2918                                 s->out[s->pos] = '\0';
2919                                 if (s->output(s->data, s->name, &s->out, s->pos, 1))
2920                                         return -1;
2921                                 s->pos = 0;
2922                                 s->state = US_NAME;
2923                                 in++;
2924                                 continue;
2925                         }
2926                         if (*in == '+') {
2927                                 in++;
2928                                 s->out[s->pos++] = ' ';
2929                                 continue;
2930                         }
2931                         s->out[s->pos++] = *in++;
2932                         break;
2933                 case US_PC1:
2934                         n = char_to_hex(*in);
2935                         if (n < 0)
2936                                 return -1;
2937
2938                         in++;
2939                         s->sum = n << 4;
2940                         s->state++;
2941                         break;
2942
2943                 case US_PC2:
2944                         n = char_to_hex(*in);
2945                         if (n < 0)
2946                                 return -1;
2947
2948                         in++;
2949                         s->out[s->pos++] = s->sum | n;
2950                         s->state = US_IDLE;
2951                         break;
2952
2953
2954                 /* states for multipart / mime style */
2955
2956                 case MT_LOOK_BOUND_IN:
2957 retry_as_first:
2958                         if (*in == s->mime_boundary[s->mp] &&
2959                             s->mime_boundary[s->mp]) {
2960                                 in++;
2961                                 s->mp++;
2962                                 if (!s->mime_boundary[s->mp]) {
2963                                         s->mp = 0;
2964                                         s->state = MT_IGNORE1;
2965
2966                                         if (s->pos || was_end)
2967                                                 if (s->output(s->data, s->name,
2968                                                       &s->out, s->pos, 1))
2969                                                         return -1;
2970
2971                                         s->pos = 0;
2972
2973                                         s->content_disp[0] = '\0';
2974                                         s->name[0] = '\0';
2975                                         s->content_disp_filename[0] = '\0';
2976                                         s->boundary_real_crlf = 1;
2977                                 }
2978                                 continue;
2979                         }
2980                         if (s->mp) {
2981                                 n = 0;
2982                                 if (!s->boundary_real_crlf)
2983                                         n = 2;
2984
2985                                 memcpy(s->out + s->pos, s->mime_boundary + n, s->mp - n);
2986                                 s->pos += s->mp;
2987                                 s->mp = 0;
2988                                 goto retry_as_first;
2989                         }
2990
2991                         s->out[s->pos++] = *in;
2992                         in++;
2993                         s->mp = 0;
2994                         break;
2995
2996                 case MT_HNAME:
2997                         m = 0;
2998                         c =*in;
2999                         if (c >= 'A' && c <= 'Z')
3000                                 c += 'a' - 'A';
3001                         for (n = 0; n < ARRAY_SIZE(mp_hdr); n++)
3002                                 if (c == mp_hdr[n][s->mp]) {
3003                                         m++;
3004                                         hit = n;
3005                                 }
3006                         in++;
3007                         if (!m) {
3008                                 s->mp = 0;
3009                                 continue;
3010                         }
3011
3012                         s->mp++;
3013                         if (m != 1)
3014                                 continue;
3015
3016                         if (mp_hdr[hit][s->mp])
3017                                 continue;
3018
3019                         s->mp = 0;
3020                         s->temp[0] = '\0';
3021                         s->subname = 0;
3022
3023                         if (hit == 2)
3024                                 s->state = MT_LOOK_BOUND_IN;
3025                         else
3026                                 s->state += hit + 1;
3027                         break;
3028
3029                 case MT_DISP:
3030                         /* form-data; name="file"; filename="t.txt" */
3031
3032                         if (*in == '\x0d') {
3033 //                              lwsl_notice("disp: '%s', '%s', '%s'\n",
3034 //                                 s->content_disp, s->name,
3035 //                                 s->content_disp_filename);
3036
3037                                 if (s->content_disp_filename[0])
3038                                         if (s->output(s->data, s->name,
3039                                                       &s->out, s->pos, LWS_UFS_OPEN))
3040                                                 return -1;
3041                                 s->state = MT_IGNORE2;
3042                                 goto done;
3043                         }
3044                         if (*in == ';') {
3045                                 s->subname = 1;
3046                                 s->temp[0] = '\0';
3047                                 s->mp = 0;
3048                                 goto done;
3049                         }
3050
3051                         if (*in == '\"') {
3052                                 s->inside_quote ^= 1;
3053                                 goto done;
3054                         }
3055
3056                         if (s->subname) {
3057                                 if (*in == '=') {
3058                                         s->temp[s->mp] = '\0';
3059                                         s->subname = 0;
3060                                         s->mp = 0;
3061                                         goto done;
3062                                 }
3063                                 if (s->mp < sizeof(s->temp) - 1 &&
3064                                     (*in != ' ' || s->inside_quote))
3065                                         s->temp[s->mp++] = *in;
3066                                 goto done;
3067                         }
3068
3069                         if (!s->temp[0]) {
3070                                 if (s->mp < sizeof(s->content_disp) - 1)
3071                                         s->content_disp[s->mp++] = *in;
3072                                 s->content_disp[s->mp] = '\0';
3073                                 goto done;
3074                         }
3075
3076                         if (!strcmp(s->temp, "name")) {
3077                                 if (s->mp < sizeof(s->name) - 1)
3078                                         s->name[s->mp++] = *in;
3079                                 s->name[s->mp] = '\0';
3080                                 goto done;
3081                         }
3082
3083                         if (!strcmp(s->temp, "filename")) {
3084                                 if (s->mp < sizeof(s->content_disp_filename) - 1)
3085                                         s->content_disp_filename[s->mp++] = *in;
3086                                 s->content_disp_filename[s->mp] = '\0';
3087                                 goto done;
3088                         }
3089 done:
3090                         in++;
3091                         break;
3092
3093                 case MT_TYPE:
3094                         if (*in == '\x0d')
3095                                 s->state = MT_IGNORE2;
3096                         else {
3097                                 if (s->mp < sizeof(s->content_type) - 1)
3098                                         s->content_type[s->mp++] = *in;
3099                                 s->content_type[s->mp] = '\0';
3100                         }
3101                         in++;
3102                         break;
3103
3104                 case MT_IGNORE1:
3105                         if (*in == '\x0d')
3106                                 s->state = MT_IGNORE2;
3107                         in++;
3108                         break;
3109
3110                 case MT_IGNORE2:
3111                         s->mp = 0;
3112                         if (*in == '\x0a')
3113                                 s->state = MT_HNAME;
3114                         in++;
3115                         break;
3116                 }
3117         }
3118
3119         return 0;
3120 }
3121
3122 static int
3123 lws_urldecode_s_destroy(struct lws_urldecode_stateful *s)
3124 {
3125         int ret = 0;
3126
3127         if (s->state != US_IDLE)
3128                 ret = -1;
3129
3130         if (!ret)
3131                 if (s->output(s->data, s->name, &s->out, s->pos, 1))
3132                         ret = -1;
3133
3134         lws_free(s);
3135
3136         return ret;
3137 }
3138
3139 struct lws_spa {
3140         struct lws_urldecode_stateful *s;
3141         lws_spa_fileupload_cb opt_cb;
3142         const char * const *param_names;
3143         int count_params;
3144         char **params;
3145         int *param_length;
3146         void *opt_data;
3147
3148         char *storage;
3149         char *end;
3150         int max_storage;
3151
3152         char finalized;
3153 };
3154
3155 static int
3156 lws_urldecode_spa_lookup(struct lws_spa *spa,
3157                          const char *name)
3158 {
3159         int n;
3160
3161         for (n = 0; n < spa->count_params; n++)
3162                 if (!strcmp(spa->param_names[n], name))
3163                         return n;
3164
3165         return -1;
3166 }
3167
3168 static int
3169 lws_urldecode_spa_cb(void *data, const char *name, char **buf, int len,
3170                      int final)
3171 {
3172         struct lws_spa *spa =
3173                         (struct lws_spa *)data;
3174         int n;
3175
3176         if (spa->s->content_disp_filename[0]) {
3177                 if (spa->opt_cb) {
3178                         n = spa->opt_cb(spa->opt_data, name,
3179                                         spa->s->content_disp_filename,
3180                                         *buf, len, final);
3181
3182                         if (n < 0)
3183                                 return -1;
3184                 }
3185                 return 0;
3186         }
3187         n = lws_urldecode_spa_lookup(spa, name);
3188
3189         if (n == -1 || !len) /* unrecognized */
3190                 return 0;
3191
3192         if (!spa->params[n])
3193                 spa->params[n] = *buf;
3194
3195         if ((*buf) + len >= spa->end) {
3196                 lwsl_notice("%s: exceeded storage\n", __func__);
3197                 return -1;
3198         }
3199
3200         spa->param_length[n] += len;
3201
3202         /* move it on inside storage */
3203         (*buf) += len;
3204         *((*buf)++) = '\0';
3205
3206         spa->s->out_len -= len + 1;
3207
3208         return 0;
3209 }
3210
3211 LWS_VISIBLE LWS_EXTERN struct lws_spa *
3212 lws_spa_create(struct lws *wsi, const char * const *param_names,
3213                          int count_params, int max_storage,
3214                          lws_spa_fileupload_cb opt_cb, void *opt_data)
3215 {
3216         struct lws_spa *spa = lws_zalloc(sizeof(*spa));
3217
3218         if (!spa)
3219                 return NULL;
3220
3221         spa->param_names = param_names;
3222         spa->count_params = count_params;
3223         spa->max_storage = max_storage;
3224         spa->opt_cb = opt_cb;
3225         spa->opt_data = opt_data;
3226
3227         spa->storage = lws_malloc(max_storage);
3228         if (!spa->storage)
3229                 goto bail2;
3230         spa->end = spa->storage + max_storage - 1;
3231
3232         spa->params = lws_zalloc(sizeof(char *) * count_params);
3233         if (!spa->params)
3234                 goto bail3;
3235
3236         spa->s = lws_urldecode_s_create(wsi, spa->storage, max_storage, spa,
3237                                         lws_urldecode_spa_cb);
3238         if (!spa->s)
3239                 goto bail4;
3240
3241         spa->param_length = lws_zalloc(sizeof(int) * count_params);
3242         if (!spa->param_length)
3243                 goto bail5;
3244
3245         lwsl_info("%s: Created SPA %p\n", __func__, spa);
3246
3247         return spa;
3248
3249 bail5:
3250         lws_urldecode_s_destroy(spa->s);
3251 bail4:
3252         lws_free(spa->params);
3253 bail3:
3254         lws_free(spa->storage);
3255 bail2:
3256         lws_free(spa);
3257
3258         return NULL;
3259 }
3260
3261 LWS_VISIBLE LWS_EXTERN int
3262 lws_spa_process(struct lws_spa *ludspa, const char *in, int len)
3263 {
3264         if (!ludspa) {
3265                 lwsl_err("%s: NULL spa\n", __func__);
3266                 return -1;
3267         }
3268         /* we reject any junk after the last part arrived and we finalized */
3269         if (ludspa->finalized)
3270                 return 0;
3271
3272         return lws_urldecode_s_process(ludspa->s, in, len);
3273 }
3274
3275 LWS_VISIBLE LWS_EXTERN int
3276 lws_spa_get_length(struct lws_spa *ludspa, int n)
3277 {
3278         if (n >= ludspa->count_params)
3279                 return 0;
3280
3281         return ludspa->param_length[n];
3282 }
3283
3284 LWS_VISIBLE LWS_EXTERN const char *
3285 lws_spa_get_string(struct lws_spa *ludspa, int n)
3286 {
3287         if (n >= ludspa->count_params)
3288                 return NULL;
3289
3290         return ludspa->params[n];
3291 }
3292
3293 LWS_VISIBLE LWS_EXTERN int
3294 lws_spa_finalize(struct lws_spa *spa)
3295 {
3296         if (spa->s) {
3297                 lws_urldecode_s_destroy(spa->s);
3298                 spa->s = NULL;
3299         }
3300
3301         spa->finalized = 1;
3302
3303         return 0;
3304 }
3305
3306 LWS_VISIBLE LWS_EXTERN int
3307 lws_spa_destroy(struct lws_spa *spa)
3308 {
3309         int n = 0;
3310
3311         lwsl_notice("%s: destroy spa %p\n", __func__, spa);
3312
3313         if (spa->s)
3314                 lws_urldecode_s_destroy(spa->s);
3315
3316         lwsl_debug("%s %p %p %p %p\n", __func__,
3317                         spa->param_length,
3318                         spa->params,
3319                         spa->storage,
3320                         spa
3321                         );
3322
3323         lws_free(spa->param_length);
3324         lws_free(spa->params);
3325         lws_free(spa->storage);
3326         lws_free(spa);
3327
3328         return n;
3329 }
3330
3331 #if 0
3332 LWS_VISIBLE LWS_EXTERN int
3333 lws_spa_destroy(struct lws_spa *spa)
3334 {
3335         int n = 0;
3336
3337         lwsl_info("%s: destroy spa %p\n", __func__, spa);
3338
3339         if (spa->s)
3340                 lws_urldecode_s_destroy(spa->s);
3341
3342         lwsl_debug("%s\n", __func__);
3343
3344         lws_free(spa->param_length);
3345         lws_free(spa->params);
3346         lws_free(spa->storage);
3347         lws_free(spa);
3348
3349         return n;
3350 }
3351 #endif
3352 LWS_VISIBLE LWS_EXTERN int
3353 lws_chunked_html_process(struct lws_process_html_args *args,
3354                          struct lws_process_html_state *s)
3355 {
3356         char *sp, buffer[32];
3357         const char *pc;
3358         int old_len, n;
3359
3360         /* do replacements */
3361         sp = args->p;
3362         old_len = args->len;
3363         args->len = 0;
3364         s->start = sp;
3365         while (sp < args->p + old_len) {
3366
3367                 if (args->len + 7 >= args->max_len) {
3368                         lwsl_err("Used up interpret padding\n");
3369                         return -1;
3370                 }
3371
3372                 if ((!s->pos && *sp == '$') || s->pos) {
3373                         int hits = 0, hit = 0;
3374
3375                         if (!s->pos)
3376                                 s->start = sp;
3377                         s->swallow[s->pos++] = *sp;
3378                         if (s->pos == sizeof(s->swallow) - 1)
3379                                 goto skip;
3380                         for (n = 0; n < s->count_vars; n++)
3381                                 if (!strncmp(s->swallow, s->vars[n], s->pos)) {
3382                                         hits++;
3383                                         hit = n;
3384                                 }
3385                         if (!hits) {
3386 skip:
3387                                 s->swallow[s->pos] = '\0';
3388                                 memcpy(s->start, s->swallow, s->pos);
3389                                 args->len++;
3390                                 s->pos = 0;
3391                                 sp = s->start + 1;
3392                                 continue;
3393                         }
3394                         if (hits == 1 && s->pos == strlen(s->vars[hit])) {
3395                                 pc = s->replace(s->data, hit);
3396                                 if (!pc)
3397                                         pc = "NULL";
3398                                 n = strlen(pc);
3399                                 s->swallow[s->pos] = '\0';
3400                                 if (n != s->pos) {
3401                                         memmove(s->start + n,
3402                                                 s->start + s->pos,
3403                                                 old_len - (sp - args->p));
3404                                         old_len += (n - s->pos) + 1;
3405                                 }
3406                                 memcpy(s->start, pc, n);
3407                                 args->len++;
3408                                 sp = s->start + 1;
3409
3410                                 s->pos = 0;
3411                         }
3412                         sp++;
3413                         continue;
3414                 }
3415
3416                 args->len++;
3417                 sp++;
3418         }
3419
3420         /* no space left for final chunk trailer */
3421         if (args->final && args->len + 7 >= args->max_len)
3422                 return -1;
3423
3424         n = sprintf(buffer, "%X\x0d\x0a", args->len);
3425
3426         args->p -= n;
3427         memcpy(args->p, buffer, n);
3428         args->len += n;
3429
3430         if (args->final) {
3431                 sp = args->p + args->len;
3432                 *sp++ = '\x0d';
3433                 *sp++ = '\x0a';
3434                 *sp++ = '0';
3435                 *sp++ = '\x0d';
3436                 *sp++ = '\x0a';
3437                 *sp++ = '\x0d';
3438                 *sp++ = '\x0a';
3439                 args->len += 7;
3440         } else {
3441                 sp = args->p + args->len;
3442                 *sp++ = '\x0d';
3443                 *sp++ = '\x0a';
3444                 args->len += 2;
3445         }
3446
3447         return 0;
3448 }