package/uhttpd/src/uhttpd.c

   1 /*
   2  * uhttpd - Tiny single-threaded httpd - Main component
   3  *
   4  *   Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
   5  *
   6  *  Licensed under the Apache License, Version 2.0 (the "License");
   7  *  you may not use this file except in compliance with the License.
   8  *  You may obtain a copy of the License at
   9  *
  10  *      http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  *  Unless required by applicable law or agreed to in writing, software
  13  *  distributed under the License is distributed on an "AS IS" BASIS,
  14  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  *  See the License for the specific language governing permissions and
  16  *  limitations under the License.
  17  */
  18
  19 #define _XOPEN_SOURCE 500       /* crypt() */
  20
  21 #include "uhttpd.h"
  22 #include "uhttpd-utils.h"
  23 #include "uhttpd-file.h"
  24
  25 #ifdef HAVE_CGI
  26 #include "uhttpd-cgi.h"
  27 #endif
  28
  29 #ifdef HAVE_LUA
  30 #include "uhttpd-lua.h"
  31 #endif
  32
  33 #ifdef HAVE_TLS
  34 #include "uhttpd-tls.h"
  35 #endif
  36
  37
  38 static int run = 1;
  39
  40 static void uh_sigterm(int sig)
  41 {
  42         run = 0;
  43 }
  44
  45 static void uh_sigchld(int sig)
  46 {
  47         while( waitpid(-1, NULL, WNOHANG) > 0 ) { }
  48 }
  49
  50 static void uh_config_parse(struct config *conf)
  51 {
  52         FILE *c;
  53         char line[512];
  54         char *col1 = NULL;
  55         char *col2 = NULL;
  56         char *eol  = NULL;
  57
  58         const char *path = conf->file ? conf->file : "/etc/httpd.conf";
  59
  60
  61         if( (c = fopen(path, "r")) != NULL )
  62         {
  63                 memset(line, 0, sizeof(line));
  64
  65                 while( fgets(line, sizeof(line) - 1, c) )
  66                 {
  67                         if( (line[0] == '/') && (strchr(line, ':') != NULL) )
  68                         {
  69                                 if( !(col1 = strchr(line, ':')) || (*col1++ = 0) ||
  70                                     !(col2 = strchr(col1, ':')) || (*col2++ = 0) ||
  71                                         !(eol = strchr(col2, '\n')) || (*eol++  = 0) )
  72                                                 continue;
  73
  74                                 if( !uh_auth_add(line, col1, col2) )
  75                                 {
  76                                         fprintf(stderr,
  77                                                 "Notice: No password set for user %s, ignoring "
  78                                                 "authentication on %s\n", col1, line
  79                                         );
  80                                 }
  81                         }
  82                         else if( !strncmp(line, "I:", 2) )
  83                         {
  84                                 if( !(col1 = strchr(line, ':')) || (*col1++ = 0) ||
  85                                     !(eol = strchr(col1, '\n')) || (*eol++  = 0) )
  86                                         continue;
  87
  88                                 conf->index_file = strdup(col1);
  89                         }
  90                         else if( !strncmp(line, "E404:", 5) )
  91                         {
  92                                 if( !(col1 = strchr(line, ':')) || (*col1++ = 0) ||
  93                                     !(eol = strchr(col1, '\n')) || (*eol++  = 0) )
  94                                                 continue;
  95
  96                                 conf->error_handler = strdup(col1);
  97                         }
  98 #ifdef HAVE_CGI
  99                         else if( (line[0] == '*') && (strchr(line, ':') != NULL) )
 100                         {
 101                                 if( !(col1 = strchr(line, '*')) || (*col1++ = 0) ||
 102                                     !(col2 = strchr(col1, ':')) || (*col2++ = 0) ||
 103                                     !(eol = strchr(col2, '\n')) || (*eol++  = 0) )
 104                                                 continue;
 105
 106                                 if( !uh_interpreter_add(col1, col2) )
 107                                 {
 108                                         fprintf(stderr,
 109                                                 "Unable to add interpreter %s for extension %s: "
 110                                                 "Out of memory\n", col2, col1
 111                                         );
 112                                 }
 113                         }
 114 #endif
 115                 }
 116
 117                 fclose(c);
 118         }
 119 }
 120
 121 static int uh_socket_bind(
 122         fd_set *serv_fds, int *max_fd, const char *host, const char *port,
 123         struct addrinfo *hints, int do_tls, struct config *conf
 124 ) {
 125         int sock = -1;
 126         int yes = 1;
 127         int status;
 128         int bound = 0;
 129
 130         int tcp_ka_idl, tcp_ka_int, tcp_ka_cnt;
 131
 132         struct listener *l = NULL;
 133         struct addrinfo *addrs = NULL, *p = NULL;
 134
 135         if( (status = getaddrinfo(host, port, hints, &addrs)) != 0 )
 136         {
 137                 fprintf(stderr, "getaddrinfo(): %s\n", gai_strerror(status));
 138         }
 139
 140         /* try to bind a new socket to each found address */
 141         for( p = addrs; p; p = p->ai_next )
 142         {
 143                 /* get the socket */
 144                 if( (sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1 )
 145                 {
 146                         perror("socket()");
 147                         goto error;
 148                 }
 149
 150                 /* "address already in use" */
 151                 if( setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) )
 152                 {
 153                         perror("setsockopt()");
 154                         goto error;
 155                 }
 156
 157                 /* TCP keep-alive */
 158                 if( conf->tcp_keepalive > 0 )
 159                 {
 160                         tcp_ka_idl = 1;
 161                         tcp_ka_cnt = 3;
 162                         tcp_ka_int = conf->tcp_keepalive;
 163
 164                         if( setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &yes, sizeof(yes)) ||
 165                             setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,  &tcp_ka_idl, sizeof(tcp_ka_idl)) ||
 166                             setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, &tcp_ka_int, sizeof(tcp_ka_int)) ||
 167                             setsockopt(sock, SOL_TCP, TCP_KEEPCNT,   &tcp_ka_cnt, sizeof(tcp_ka_cnt)) )
 168                         {
 169                             fprintf(stderr, "Notice: Unable to enable TCP keep-alive: %s\n",
 170                                 strerror(errno));
 171                         }
 172                 }
 173
 174                 /* required to get parallel v4 + v6 working */
 175                 if( p->ai_family == AF_INET6 )
 176                 {
 177                         if( setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof(yes)) == -1 )
 178                         {
 179                                 perror("setsockopt()");
 180                                 goto error;
 181                         }
 182                 }
 183
 184                 /* bind */
 185                 if( bind(sock, p->ai_addr, p->ai_addrlen) == -1 )
 186                 {
 187                         perror("bind()");
 188                         goto error;
 189                 }
 190
 191                 /* listen */
 192                 if( listen(sock, UH_LIMIT_CLIENTS) == -1 )
 193                 {
 194                         perror("listen()");
 195                         goto error;
 196                 }
 197
 198                 /* add listener to global list */
 199                 if( ! (l = uh_listener_add(sock, conf)) )
 200                 {
 201                         fprintf(stderr, "uh_listener_add(): Failed to allocate memory\n");
 202                         goto error;
 203                 }
 204
 205 #ifdef HAVE_TLS
 206                 /* init TLS */
 207                 l->tls = do_tls ? conf->tls : NULL;
 208 #endif
 209
 210                 /* add socket to server fd set */
 211                 FD_SET(sock, serv_fds);
 212                 fd_cloexec(sock);
 213                 *max_fd = max(*max_fd, sock);
 214
 215                 bound++;
 216                 continue;
 217
 218                 error:
 219                 if( sock > 0 )
 220                         close(sock);
 221         }
 222
 223         freeaddrinfo(addrs);
 224
 225         return bound;
 226 }
 227
 228 static struct http_request * uh_http_header_parse(struct client *cl, char *buffer, int buflen)
 229 {
 230         char *method  = &buffer[0];
 231         char *path    = NULL;
 232         char *version = NULL;
 233
 234         char *headers = NULL;
 235         char *hdrname = NULL;
 236         char *hdrdata = NULL;
 237
 238         int i;
 239         int hdrcount = 0;
 240
 241         static struct http_request req;
 242
 243         memset(&req, 0, sizeof(req));
 244
 245
 246         /* terminate initial header line */
 247         if( (headers = strfind(buffer, buflen, "\r\n", 2)) != NULL )
 248         {
 249                 buffer[buflen-1] = 0;
 250
 251                 *headers++ = 0;
 252                 *headers++ = 0;
 253
 254                 /* find request path */
 255                 if( (path = strchr(buffer, ' ')) != NULL )
 256                         *path++ = 0;
 257
 258                 /* find http version */
 259                 if( (path != NULL) && ((version = strchr(path, ' ')) != NULL) )
 260                         *version++ = 0;
 261
 262
 263                 /* check method */
 264                 if( strcmp(method, "GET") && strcmp(method, "HEAD") && strcmp(method, "POST") )
 265                 {
 266                         /* invalid method */
 267                         uh_http_response(cl, 405, "Method Not Allowed");
 268                         return NULL;
 269                 }
 270                 else
 271                 {
 272                         switch(method[0])
 273                         {
 274                                 case 'G':
 275                                         req.method = UH_HTTP_MSG_GET;
 276                                         break;
 277
 278                                 case 'H':
 279                                         req.method = UH_HTTP_MSG_HEAD;
 280                                         break;
 281
 282                                 case 'P':
 283                                         req.method = UH_HTTP_MSG_POST;
 284                                         break;
 285                         }
 286                 }
 287
 288                 /* check path */
 289                 if( !path || !strlen(path) )
 290                 {
 291                         /* malformed request */
 292                         uh_http_response(cl, 400, "Bad Request");
 293                         return NULL;
 294                 }
 295                 else
 296                 {
 297                         req.url = path;
 298                 }
 299
 300                 /* check version */
 301                 if( (version == NULL) || (strcmp(version, "HTTP/0.9") &&
 302                     strcmp(version, "HTTP/1.0") && strcmp(version, "HTTP/1.1")) )
 303                 {
 304                         /* unsupported version */
 305                         uh_http_response(cl, 400, "Bad Request");
 306                         return NULL;
 307                 }
 308                 else
 309                 {
 310                         req.version = strtof(&version[5], NULL);
 311                 }
 312
 313
 314                 /* process header fields */
 315                 for( i = (int)(headers - buffer); i < buflen; i++ )
 316                 {
 317                         /* found eol and have name + value, push out header tuple */
 318                         if( hdrname && hdrdata && (buffer[i] == '\r' || buffer[i] == '\n') )
 319                         {
 320                                 buffer[i] = 0;
 321
 322                                 /* store */
 323                                 if( (hdrcount + 1) < array_size(req.headers) )
 324                                 {
 325                                         req.headers[hdrcount++] = hdrname;
 326                                         req.headers[hdrcount++] = hdrdata;
 327
 328                                         hdrname = hdrdata = NULL;
 329                                 }
 330
 331                                 /* too large */
 332                                 else
 333                                 {
 334                                         uh_http_response(cl, 413, "Request Entity Too Large");
 335                                         return NULL;
 336                                 }
 337                         }
 338
 339                         /* have name but no value and found a colon, start of value */
 340                         else if( hdrname && !hdrdata && ((i+2) < buflen) &&
 341                                 (buffer[i] == ':') && (buffer[i+1] == ' ')
 342                         ) {
 343                                 buffer[i] = 0;
 344                                 hdrdata = &buffer[i+2];
 345                         }
 346
 347                         /* have no name and found [A-Za-z], start of name */
 348                         else if( !hdrname && isalpha(buffer[i]) )
 349                         {
 350                                 hdrname = &buffer[i];
 351                         }
 352                 }
 353
 354                 /* valid enough */
 355                 req.redirect_status = 200;
 356                 return &req;
 357         }
 358
 359         /* Malformed request */
 360         uh_http_response(cl, 400, "Bad Request");
 361         return NULL;
 362 }
 363
 364
 365 static struct http_request * uh_http_header_recv(struct client *cl)
 366 {
 367         static char buffer[UH_LIMIT_MSGHEAD];
 368         char *bufptr = &buffer[0];
 369         char *idxptr = NULL;
 370
 371         struct timeval timeout;
 372
 373         fd_set reader;
 374
 375         ssize_t blen = sizeof(buffer)-1;
 376         ssize_t rlen = 0;
 377
 378         memset(buffer, 0, sizeof(buffer));
 379
 380         while( blen > 0 )
 381         {
 382                 FD_ZERO(&reader);
 383                 FD_SET(cl->socket, &reader);
 384
 385                 /* fail after 0.1s */
 386                 timeout.tv_sec  = 0;
 387                 timeout.tv_usec = 100000;
 388
 389                 /* check whether fd is readable */
 390                 if( select(cl->socket + 1, &reader, NULL, NULL, &timeout) > 0 )
 391                 {
 392                         /* receive data */
 393                         ensure_out(rlen = uh_tcp_peek(cl, bufptr, blen));
 394
 395                         if( (idxptr = strfind(buffer, sizeof(buffer), "\r\n\r\n", 4)) )
 396                         {
 397                                 ensure_out(rlen = uh_tcp_recv(cl, bufptr,
 398                                         (int)(idxptr - bufptr) + 4));
 399
 400                                 /* header read complete ... */
 401                                 blen -= rlen;
 402                                 return uh_http_header_parse(cl, buffer,
 403                                         sizeof(buffer) - blen - 1);
 404                         }
 405                         else
 406                         {
 407                                 ensure_out(rlen = uh_tcp_recv(cl, bufptr, rlen));
 408
 409                                 /* unexpected eof - #7904 */
 410                                 if( rlen == 0 )
 411                                         return NULL;
 412
 413                                 blen -= rlen;
 414                                 bufptr += rlen;
 415                         }
 416                 }
 417                 else
 418                 {
 419                         /* invalid request (unexpected eof/timeout) */
 420                         return NULL;
 421                 }
 422         }
 423
 424         /* request entity too large */
 425         uh_http_response(cl, 413, "Request Entity Too Large");
 426
 427 out:
 428         return NULL;
 429 }
 430
 431 #if defined(HAVE_LUA) || defined(HAVE_CGI)
 432 static int uh_path_match(const char *prefix, const char *url)
 433 {
 434         if( (strstr(url, prefix) == url) &&
 435             ((prefix[strlen(prefix)-1] == '/') ||
 436                  (strlen(url) == strlen(prefix))   ||
 437                  (url[strlen(prefix)] == '/'))
 438         ) {
 439                 return 1;
 440         }
 441
 442         return 0;
 443 }
 444 #endif
 445
 446 static void uh_dispatch_request(
 447         struct client *cl, struct http_request *req, struct path_info *pin
 448 ) {
 449 #ifdef HAVE_CGI
 450         struct interpreter *ipr = NULL;
 451
 452         if( uh_path_match(cl->server->conf->cgi_prefix, pin->name) ||
 453                 (ipr = uh_interpreter_lookup(pin->phys)) )
 454         {
 455                 uh_cgi_request(cl, req, pin, ipr);
 456         }
 457         else
 458 #endif
 459         {
 460                 uh_file_request(cl, req, pin);
 461         }
 462 }
 463
 464 static void uh_mainloop(struct config *conf, fd_set serv_fds, int max_fd)
 465 {
 466         /* master file descriptor list */
 467         fd_set used_fds, read_fds;
 468
 469         /* working structs */
 470         struct http_request *req;
 471         struct path_info *pin;
 472         struct client *cl;
 473
 474         /* maximum file descriptor number */
 475         int new_fd, cur_fd = 0;
 476
 477         /* clear the master and temp sets */
 478         FD_ZERO(&used_fds);
 479         FD_ZERO(&read_fds);
 480
 481         /* backup server descriptor set */
 482         used_fds = serv_fds;
 483
 484         /* loop */
 485         while(run)
 486         {
 487                 /* create a working copy of the used fd set */
 488                 read_fds = used_fds;
 489
 490                 /* sleep until socket activity */
 491                 if( select(max_fd + 1, &read_fds, NULL, NULL, NULL) == -1 )
 492                 {
 493                         perror("select()");
 494                         exit(1);
 495                 }
 496
 497                 /* run through the existing connections looking for data to be read */
 498                 for( cur_fd = 0; cur_fd <= max_fd; cur_fd++ )
 499                 {
 500                         /* is a socket managed by us */
 501                         if( FD_ISSET(cur_fd, &read_fds) )
 502                         {
 503                                 /* is one of our listen sockets */
 504                                 if( FD_ISSET(cur_fd, &serv_fds) )
 505                                 {
 506                                         /* handle new connections */
 507                                         if( (new_fd = accept(cur_fd, NULL, 0)) != -1 )
 508                                         {
 509                                                 /* add to global client list */
 510                                                 if( (cl = uh_client_add(new_fd, uh_listener_lookup(cur_fd))) != NULL )
 511                                                 {
 512 #ifdef HAVE_TLS
 513                                                         /* setup client tls context */
 514                                                         if( conf->tls )
 515                                                                 conf->tls_accept(cl);
 516 #endif
 517
 518                                                         /* add client socket to global fdset */
 519                                                         FD_SET(new_fd, &used_fds);
 520                                                         fd_cloexec(new_fd);
 521                                                         max_fd = max(max_fd, new_fd);
 522                                                 }
 523
 524                                                 /* insufficient resources */
 525                                                 else
 526                                                 {
 527                                                         fprintf(stderr,
 528                                                                 "uh_client_add(): Cannot allocate memory\n");
 529
 530                                                         close(new_fd);
 531                                                 }
 532                                         }
 533                                 }
 534
 535                                 /* is a client socket */
 536                                 else
 537                                 {
 538                                         if( ! (cl = uh_client_lookup(cur_fd)) )
 539                                         {
 540                                                 /* this should not happen! */
 541                                                 fprintf(stderr,
 542                                                         "uh_client_lookup(): No entry for fd %i!\n",
 543                                                         cur_fd);
 544
 545                                                 goto cleanup;
 546                                         }
 547
 548                                         /* parse message header */
 549                                         if( (req = uh_http_header_recv(cl)) != NULL )
 550                                         {
 551                                                 /* RFC1918 filtering required? */
 552                                                 if( conf->rfc1918_filter &&
 553                                                     sa_rfc1918(&cl->peeraddr) &&
 554                                                     !sa_rfc1918(&cl->servaddr) )
 555                                                 {
 556                                                         uh_http_sendhf(cl, 403, "Forbidden",
 557                                                                 "Rejected request from RFC1918 IP "
 558                                                                 "to public server address");
 559                                                 }
 560                                                 else
 561 #ifdef HAVE_LUA
 562                                                 /* Lua request? */
 563                                                 if( conf->lua_state &&
 564                                                     uh_path_match(conf->lua_prefix, req->url) )
 565                                                 {
 566                                                         conf->lua_request(cl, req, conf->lua_state);
 567                                                 }
 568                                                 else
 569 #endif
 570                                                 /* dispatch request */
 571                                                 if( (pin = uh_path_lookup(cl, req->url)) != NULL )
 572                                                 {
 573                                                         /* auth ok? */
 574                                                         if( !pin->redirected && uh_auth_check(cl, req, pin) )
 575                                                                 uh_dispatch_request(cl, req, pin);
 576                                                 }
 577
 578                                                 /* 404 */
 579                                                 else
 580                                                 {
 581                                                         /* Try to invoke an error handler */
 582                                                         pin = uh_path_lookup(cl, conf->error_handler);
 583
 584                                                         if( pin && uh_auth_check(cl, req, pin) )
 585                                                         {
 586                                                                 req->redirect_status = 404;
 587                                                                 uh_dispatch_request(cl, req, pin);
 588                                                         }
 589                                                         else
 590                                                         {
 591                                                                 uh_http_sendhf(cl, 404, "Not Found",
 592                                                                         "No such file or directory");
 593                                                         }
 594                                                 }
 595                                         }
 596
 597 #ifdef HAVE_TLS
 598                                         /* free client tls context */
 599                                         if( conf->tls )
 600                                                 conf->tls_close(cl);
 601 #endif
 602
 603                                         cleanup:
 604
 605                                         /* close client socket */
 606                                         close(cur_fd);
 607                                         FD_CLR(cur_fd, &used_fds);
 608
 609                                         /* remove from global client list */
 610                                         uh_client_remove(cur_fd);
 611                                 }
 612                         }
 613                 }
 614         }
 615
 616 #ifdef HAVE_LUA
 617         /* destroy the Lua state */
 618         if( conf->lua_state != NULL )
 619                 conf->lua_close(conf->lua_state);
 620 #endif
 621 }
 622
 623
 624 int main (int argc, char **argv)
 625 {
 626         /* master file descriptor list */
 627         fd_set serv_fds;
 628
 629         /* working structs */
 630         struct addrinfo hints;
 631         struct sigaction sa;
 632         struct config conf;
 633
 634         /* signal mask */
 635         sigset_t ss;
 636
 637         /* maximum file descriptor number */
 638         int cur_fd, max_fd = 0;
 639
 640 #ifdef HAVE_TLS
 641         int tls = 0;
 642         int keys = 0;
 643 #endif
 644
 645         int bound = 0;
 646         int nofork = 0;
 647
 648         /* args */
 649         int opt;
 650         char bind[128];
 651         char *port = NULL;
 652
 653 #if defined(HAVE_TLS) || defined(HAVE_LUA)
 654         /* library handle */
 655         void *lib;
 656 #endif
 657
 658         FD_ZERO(&serv_fds);
 659
 660         /* handle SIGPIPE, SIGINT, SIGTERM, SIGCHLD */
 661         sa.sa_flags = 0;
 662         sigemptyset(&sa.sa_mask);
 663
 664         sa.sa_handler = SIG_IGN;
 665         sigaction(SIGPIPE, &sa, NULL);
 666
 667         sa.sa_handler = uh_sigchld;
 668         sigaction(SIGCHLD, &sa, NULL);
 669
 670         sa.sa_handler = uh_sigterm;
 671         sigaction(SIGINT,  &sa, NULL);
 672         sigaction(SIGTERM, &sa, NULL);
 673
 674         /* defer SIGCHLD */
 675         sigemptyset(&ss);
 676         sigaddset(&ss, SIGCHLD);
 677         sigprocmask(SIG_BLOCK, &ss, NULL);
 678
 679         /* prepare addrinfo hints */
 680         memset(&hints, 0, sizeof(hints));
 681         hints.ai_family   = AF_UNSPEC;
 682         hints.ai_socktype = SOCK_STREAM;
 683         hints.ai_flags    = AI_PASSIVE;
 684
 685         /* parse args */
 686         memset(&conf, 0, sizeof(conf));
 687         memset(bind, 0, sizeof(bind));
 688
 689 #ifdef HAVE_TLS
 690         /* load TLS plugin */
 691         if( ! (lib = dlopen("uhttpd_tls.so", RTLD_LAZY | RTLD_GLOBAL)) )
 692         {
 693                 fprintf(stderr,
 694                         "Notice: Unable to load TLS plugin - disabling SSL support! "
 695                         "(Reason: %s)\n", dlerror()
 696                 );
 697         }
 698         else
 699         {
 700                 /* resolve functions */
 701                 if( !(conf.tls_init   = dlsym(lib, "uh_tls_ctx_init"))      ||
 702                     !(conf.tls_cert   = dlsym(lib, "uh_tls_ctx_cert"))      ||
 703                     !(conf.tls_key    = dlsym(lib, "uh_tls_ctx_key"))       ||
 704                     !(conf.tls_free   = dlsym(lib, "uh_tls_ctx_free"))      ||
 705                         !(conf.tls_accept = dlsym(lib, "uh_tls_client_accept")) ||
 706                         !(conf.tls_close  = dlsym(lib, "uh_tls_client_close"))  ||
 707                         !(conf.tls_recv   = dlsym(lib, "uh_tls_client_recv"))   ||
 708                         !(conf.tls_send   = dlsym(lib, "uh_tls_client_send"))
 709                 ) {
 710                         fprintf(stderr,
 711                                 "Error: Failed to lookup required symbols "
 712                                 "in TLS plugin: %s\n", dlerror()
 713                         );
 714                         exit(1);
 715                 }
 716
 717                 /* init SSL context */
 718                 if( ! (conf.tls = conf.tls_init()) )
 719                 {
 720                         fprintf(stderr, "Error: Failed to initalize SSL context\n");
 721                         exit(1);
 722                 }
 723         }
 724 #endif
 725
 726         while( (opt = getopt(argc, argv,
 727                 "fSDRC:K:E:I:p:s:h:c:l:L:d:r:m:x:i:t:T:A:")) > 0
 728         ) {
 729                 switch(opt)
 730                 {
 731                         /* [addr:]port */
 732                         case 'p':
 733                         case 's':
 734                                 if( (port = strrchr(optarg, ':')) != NULL )
 735                                 {
 736                                         if( (optarg[0] == '[') && (port > optarg) && (port[-1] == ']') )
 737                                                 memcpy(bind, optarg + 1,
 738                                                         min(sizeof(bind), (int)(port - optarg) - 2));
 739                                         else
 740                                                 memcpy(bind, optarg,
 741                                                         min(sizeof(bind), (int)(port - optarg)));
 742
 743                                         port++;
 744                                 }
 745                                 else
 746                                 {
 747                                         port = optarg;
 748                                 }
 749
 750 #ifdef HAVE_TLS
 751                                 if( opt == 's' )
 752                                 {
 753                                         if( !conf.tls )
 754                                         {
 755                                                 fprintf(stderr,
 756                                                         "Notice: TLS support is disabled, "
 757                                                         "ignoring '-s %s'\n", optarg
 758                                                 );
 759                                                 continue;
 760                                         }
 761
 762                                         tls = 1;
 763                                 }
 764 #endif
 765
 766                                 /* bind sockets */
 767                                 bound += uh_socket_bind(
 768                                         &serv_fds, &max_fd, bind[0] ? bind : NULL, port,
 769                                         &hints, (opt == 's'), &conf
 770                                 );
 771
 772                                 memset(bind, 0, sizeof(bind));
 773                                 break;
 774
 775 #ifdef HAVE_TLS
 776                         /* certificate */
 777                         case 'C':
 778                                 if( conf.tls )
 779                                 {
 780                                         if( conf.tls_cert(conf.tls, optarg) < 1 )
 781                                         {
 782                                                 fprintf(stderr,
 783                                                         "Error: Invalid certificate file given\n");
 784                                                 exit(1);
 785                                         }
 786
 787                                         keys++;
 788                                 }
 789
 790                                 break;
 791
 792                         /* key */
 793                         case 'K':
 794                                 if( conf.tls )
 795                                 {
 796                                         if( conf.tls_key(conf.tls, optarg) < 1 )
 797                                         {
 798                                                 fprintf(stderr,
 799                                                         "Error: Invalid private key file given\n");
 800                                                 exit(1);
 801                                         }
 802
 803                                         keys++;
 804                                 }
 805
 806                                 break;
 807 #endif
 808
 809                         /* docroot */
 810                         case 'h':
 811                                 if( ! realpath(optarg, conf.docroot) )
 812                                 {
 813                                         fprintf(stderr, "Error: Invalid directory %s: %s\n",
 814                                                 optarg, strerror(errno));
 815                                         exit(1);
 816                                 }
 817                                 break;
 818
 819                         /* error handler */
 820                         case 'E':
 821                                 if( (strlen(optarg) == 0) || (optarg[0] != '/') )
 822                                 {
 823                                         fprintf(stderr, "Error: Invalid error handler: %s\n",
 824                                                 optarg);
 825                                         exit(1);
 826                                 }
 827                                 conf.error_handler = optarg;
 828                                 break;
 829
 830                         /* index file */
 831                         case 'I':
 832                                 if( (strlen(optarg) == 0) || (optarg[0] == '/') )
 833                                 {
 834                                         fprintf(stderr, "Error: Invalid index page: %s\n",
 835                                                 optarg);
 836                                         exit(1);
 837                                 }
 838                                 conf.index_file = optarg;
 839                                 break;
 840
 841                         /* don't follow symlinks */
 842                         case 'S':
 843                                 conf.no_symlinks = 1;
 844                                 break;
 845
 846                         /* don't list directories */
 847                         case 'D':
 848                                 conf.no_dirlists = 1;
 849                                 break;
 850
 851                         case 'R':
 852                                 conf.rfc1918_filter = 1;
 853                                 break;
 854
 855 #ifdef HAVE_CGI
 856                         /* cgi prefix */
 857                         case 'x':
 858                                 conf.cgi_prefix = optarg;
 859                                 break;
 860
 861                         /* interpreter */
 862                         case 'i':
 863                                 if( (optarg[0] == '.') && (port = strchr(optarg, '=')) )
 864                                 {
 865                                         *port++ = 0;
 866                                         uh_interpreter_add(optarg, port);
 867                                 }
 868                                 else
 869                                 {
 870                                         fprintf(stderr, "Error: Invalid interpreter: %s\n",
 871                                                 optarg);
 872                                         exit(1);
 873                                 }
 874                                 break;
 875 #endif
 876
 877 #ifdef HAVE_LUA
 878                         /* lua prefix */
 879                         case 'l':
 880                                 conf.lua_prefix = optarg;
 881                                 break;
 882
 883                         /* lua handler */
 884                         case 'L':
 885                                 conf.lua_handler = optarg;
 886                                 break;
 887 #endif
 888
 889 #if defined(HAVE_CGI) || defined(HAVE_LUA)
 890                         /* script timeout */
 891                         case 't':
 892                                 conf.script_timeout = atoi(optarg);
 893                                 break;
 894 #endif
 895
 896                         /* network timeout */
 897                         case 'T':
 898                                 conf.network_timeout = atoi(optarg);
 899                                 break;
 900
 901                         /* tcp keep-alive */
 902                         case 'A':
 903                                 conf.tcp_keepalive = atoi(optarg);
 904                                 break;
 905
 906                         /* no fork */
 907                         case 'f':
 908                                 nofork = 1;
 909                                 break;
 910
 911                         /* urldecode */
 912                         case 'd':
 913                                 if( (port = malloc(strlen(optarg)+1)) != NULL )
 914                                 {
 915                                         memset(port, 0, strlen(optarg)+1);
 916                                         uh_urldecode(port, strlen(optarg), optarg, strlen(optarg));
 917                                         printf("%s", port);
 918                                         free(port);
 919                                         exit(0);
 920                                 }
 921                                 break;
 922
 923                         /* basic auth realm */
 924                         case 'r':
 925                                 conf.realm = optarg;
 926                                 break;
 927
 928                         /* md5 crypt */
 929                         case 'm':
 930                                 printf("%s\n", crypt(optarg, "$1$"));
 931                                 exit(0);
 932                                 break;
 933
 934                         /* config file */
 935                         case 'c':
 936                                 conf.file = optarg;
 937                                 break;
 938
 939                         default:
 940                                 fprintf(stderr,
 941                                         "Usage: %s -p [addr:]port [-h docroot]\n"
 942                                         "       -f              Do not fork to background\n"
 943                                         "       -c file         Configuration file, default is '/etc/httpd.conf'\n"
 944                                         "       -p [addr:]port  Bind to specified address and port, multiple allowed\n"
 945 #ifdef HAVE_TLS
 946                                         "       -s [addr:]port  Like -p but provide HTTPS on this port\n"
 947                                         "       -C file         ASN.1 server certificate file\n"
 948                                         "       -K file         ASN.1 server private key file\n"
 949 #endif
 950                                         "       -h directory    Specify the document root, default is '.'\n"
 951                                         "       -E string       Use given virtual URL as 404 error handler\n"
 952                                         "       -I string       Use given filename as index page for directories\n"
 953                                         "       -S              Do not follow symbolic links outside of the docroot\n"
 954                                         "       -D              Do not allow directory listings, send 403 instead\n"
 955                                         "       -R              Enable RFC1918 filter\n"
 956 #ifdef HAVE_LUA
 957                                         "       -l string       URL prefix for Lua handler, default is '/lua'\n"
 958                                         "       -L file         Lua handler script, omit to disable Lua\n"
 959 #endif
 960 #ifdef HAVE_CGI
 961                                         "       -x string       URL prefix for CGI handler, default is '/cgi-bin'\n"
 962                                         "       -i .ext=path    Use interpreter at path for files with the given extension\n"
 963 #endif
 964 #if defined(HAVE_CGI) || defined(HAVE_LUA)
 965                                         "       -t seconds      CGI and Lua script timeout in seconds, default is 60\n"
 966 #endif
 967                                         "       -T seconds      Network timeout in seconds, default is 30\n"
 968                                         "       -d string       URL decode given string\n"
 969                                         "       -r string       Specify basic auth realm\n"
 970                                         "       -m string       MD5 crypt given string\n"
 971                                         "\n", argv[0]
 972                                 );
 973
 974                                 exit(1);
 975                 }
 976         }
 977
 978 #ifdef HAVE_TLS
 979         if( (tls == 1) && (keys < 2) )
 980         {
 981                 fprintf(stderr, "Error: Missing private key or certificate file\n");
 982                 exit(1);
 983         }
 984 #endif
 985
 986         if( bound < 1 )
 987         {
 988                 fprintf(stderr, "Error: No sockets bound, unable to continue\n");
 989                 exit(1);
 990         }
 991
 992         /* default docroot */
 993         if( !conf.docroot[0] && !realpath(".", conf.docroot) )
 994         {
 995                 fprintf(stderr, "Error: Can not determine default document root: %s\n",
 996                         strerror(errno));
 997                 exit(1);
 998         }
 999
1000         /* default realm */
1001         if( ! conf.realm )
1002                 conf.realm = "Protected Area";
1003
1004         /* config file */
1005         uh_config_parse(&conf);
1006
1007         /* default network timeout */
1008         if( conf.network_timeout <= 0 )
1009                 conf.network_timeout = 30;
1010
1011 #if defined(HAVE_CGI) || defined(HAVE_LUA)
1012         /* default script timeout */
1013         if( conf.script_timeout <= 0 )
1014                 conf.script_timeout = 60;
1015 #endif
1016
1017 #ifdef HAVE_CGI
1018         /* default cgi prefix */
1019         if( ! conf.cgi_prefix )
1020                 conf.cgi_prefix = "/cgi-bin";
1021 #endif
1022
1023 #ifdef HAVE_LUA
1024         /* load Lua plugin */
1025         if( ! (lib = dlopen("uhttpd_lua.so", RTLD_LAZY | RTLD_GLOBAL)) )
1026         {
1027                 fprintf(stderr,
1028                         "Notice: Unable to load Lua plugin - disabling Lua support! "
1029                         "(Reason: %s)\n", dlerror()
1030                 );
1031         }
1032         else
1033         {
1034                 /* resolve functions */
1035                 if( !(conf.lua_init    = dlsym(lib, "uh_lua_init"))    ||
1036                     !(conf.lua_close   = dlsym(lib, "uh_lua_close"))   ||
1037                     !(conf.lua_request = dlsym(lib, "uh_lua_request"))
1038                 ) {
1039                         fprintf(stderr,
1040                                 "Error: Failed to lookup required symbols "
1041                                 "in Lua plugin: %s\n", dlerror()
1042                         );
1043                         exit(1);
1044                 }
1045
1046                 /* init Lua runtime if handler is specified */
1047                 if( conf.lua_handler )
1048                 {
1049                         /* default lua prefix */
1050                         if( ! conf.lua_prefix )
1051                                 conf.lua_prefix = "/lua";
1052
1053                         conf.lua_state = conf.lua_init(conf.lua_handler);
1054                 }
1055         }
1056 #endif
1057
1058         /* fork (if not disabled) */
1059         if( ! nofork )
1060         {
1061                 switch( fork() )
1062                 {
1063                         case -1:
1064                                 perror("fork()");
1065                                 exit(1);
1066
1067                         case 0:
1068                                 /* daemon setup */
1069                                 if( chdir("/") )
1070                                         perror("chdir()");
1071
1072                                 if( (cur_fd = open("/dev/null", O_WRONLY)) > -1 )
1073                                         dup2(cur_fd, 0);
1074
1075                                 if( (cur_fd = open("/dev/null", O_RDONLY)) > -1 )
1076                                         dup2(cur_fd, 1);
1077
1078                                 if( (cur_fd = open("/dev/null", O_RDONLY)) > -1 )
1079                                         dup2(cur_fd, 2);
1080
1081                                 break;
1082
1083                         default:
1084                                 exit(0);
1085                 }
1086         }
1087
1088         /* server main loop */
1089         uh_mainloop(&conf, serv_fds, max_fd);
1090
1091 #ifdef HAVE_LUA
1092         /* destroy the Lua state */
1093         if( conf.lua_state != NULL )
1094                 conf.lua_close(conf.lua_state);
1095 #endif
1096
1097         return 0;
1098 }