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