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                                                         {
 516                                                                 if( conf->tls_accept(cl) < 1 )
 517                                                                 {
 518                                                                         fprintf(stderr,
 519                                                                                 "tls_accept failed, "
 520                                                                                 "connection dropped\n");
 521
 522                                                                         /* close client socket */
 523                                                                         close(new_fd);
 524
 525                                                                         /* remove from global client list */
 526                                                                         uh_client_remove(new_fd);
 527
 528                                                                         continue;
 529                                                                 }
 530                                                         }
 531 #endif
 532
 533                                                         /* add client socket to global fdset */
 534                                                         FD_SET(new_fd, &used_fds);
 535                                                         fd_cloexec(new_fd);
 536                                                         max_fd = max(max_fd, new_fd);
 537                                                 }
 538
 539                                                 /* insufficient resources */
 540                                                 else
 541                                                 {
 542                                                         fprintf(stderr,
 543                                                                 "uh_client_add(): Cannot allocate memory\n");
 544
 545                                                         close(new_fd);
 546                                                 }
 547                                         }
 548                                 }
 549
 550                                 /* is a client socket */
 551                                 else
 552                                 {
 553                                         if( ! (cl = uh_client_lookup(cur_fd)) )
 554                                         {
 555                                                 /* this should not happen! */
 556                                                 fprintf(stderr,
 557                                                         "uh_client_lookup(): No entry for fd %i!\n",
 558                                                         cur_fd);
 559
 560                                                 goto cleanup;
 561                                         }
 562
 563                                         /* parse message header */
 564                                         if( (req = uh_http_header_recv(cl)) != NULL )
 565                                         {
 566                                                 /* RFC1918 filtering required? */
 567                                                 if( conf->rfc1918_filter &&
 568                                                     sa_rfc1918(&cl->peeraddr) &&
 569                                                     !sa_rfc1918(&cl->servaddr) )
 570                                                 {
 571                                                         uh_http_sendhf(cl, 403, "Forbidden",
 572                                                                 "Rejected request from RFC1918 IP "
 573                                                                 "to public server address");
 574                                                 }
 575                                                 else
 576 #ifdef HAVE_LUA
 577                                                 /* Lua request? */
 578                                                 if( conf->lua_state &&
 579                                                     uh_path_match(conf->lua_prefix, req->url) )
 580                                                 {
 581                                                         conf->lua_request(cl, req, conf->lua_state);
 582                                                 }
 583                                                 else
 584 #endif
 585                                                 /* dispatch request */
 586                                                 if( (pin = uh_path_lookup(cl, req->url)) != NULL )
 587                                                 {
 588                                                         /* auth ok? */
 589                                                         if( !pin->redirected && uh_auth_check(cl, req, pin) )
 590                                                                 uh_dispatch_request(cl, req, pin);
 591                                                 }
 592
 593                                                 /* 404 */
 594                                                 else
 595                                                 {
 596                                                         /* Try to invoke an error handler */
 597                                                         pin = uh_path_lookup(cl, conf->error_handler);
 598
 599                                                         if( pin && uh_auth_check(cl, req, pin) )
 600                                                         {
 601                                                                 req->redirect_status = 404;
 602                                                                 uh_dispatch_request(cl, req, pin);
 603                                                         }
 604                                                         else
 605                                                         {
 606                                                                 uh_http_sendhf(cl, 404, "Not Found",
 607                                                                         "No such file or directory");
 608                                                         }
 609                                                 }
 610                                         }
 611
 612 #ifdef HAVE_TLS
 613                                         /* free client tls context */
 614                                         if( conf->tls )
 615                                                 conf->tls_close(cl);
 616 #endif
 617
 618                                         cleanup:
 619
 620                                         /* close client socket */
 621                                         close(cur_fd);
 622                                         FD_CLR(cur_fd, &used_fds);
 623
 624                                         /* remove from global client list */
 625                                         uh_client_remove(cur_fd);
 626                                 }
 627                         }
 628                 }
 629         }
 630
 631 #ifdef HAVE_LUA
 632         /* destroy the Lua state */
 633         if( conf->lua_state != NULL )
 634                 conf->lua_close(conf->lua_state);
 635 #endif
 636 }
 637
 638 #ifdef HAVE_TLS
 639 static inline int uh_inittls(struct config *conf)
 640 {
 641         /* library handle */
 642         void *lib;
 643
 644         /* already loaded */
 645         if( conf->tls != NULL )
 646                 return 0;
 647
 648         /* load TLS plugin */
 649         if( ! (lib = dlopen("uhttpd_tls.so", RTLD_LAZY | RTLD_GLOBAL)) )
 650         {
 651                 fprintf(stderr,
 652                         "Notice: Unable to load TLS plugin - disabling SSL support! "
 653                         "(Reason: %s)\n", dlerror()
 654                 );
 655
 656                 return 1;
 657         }
 658         else
 659         {
 660                 /* resolve functions */
 661                 if( !(conf->tls_init   = dlsym(lib, "uh_tls_ctx_init"))      ||
 662                     !(conf->tls_cert   = dlsym(lib, "uh_tls_ctx_cert"))      ||
 663                     !(conf->tls_key    = dlsym(lib, "uh_tls_ctx_key"))       ||
 664                     !(conf->tls_free   = dlsym(lib, "uh_tls_ctx_free"))      ||
 665                     !(conf->tls_accept = dlsym(lib, "uh_tls_client_accept")) ||
 666                     !(conf->tls_close  = dlsym(lib, "uh_tls_client_close"))  ||
 667                     !(conf->tls_recv   = dlsym(lib, "uh_tls_client_recv"))   ||
 668                     !(conf->tls_send   = dlsym(lib, "uh_tls_client_send"))
 669                 ) {
 670                         fprintf(stderr,
 671                                 "Error: Failed to lookup required symbols "
 672                                 "in TLS plugin: %s\n", dlerror()
 673                         );
 674                         exit(1);
 675                 }
 676
 677                 /* init SSL context */
 678                 if( ! (conf->tls = conf->tls_init()) )
 679                 {
 680                         fprintf(stderr, "Error: Failed to initalize SSL context\n");
 681                         exit(1);
 682                 }
 683         }
 684
 685         return 0;
 686 }
 687 #endif
 688
 689 int main (int argc, char **argv)
 690 {
 691         /* master file descriptor list */
 692         fd_set serv_fds;
 693
 694         /* working structs */
 695         struct addrinfo hints;
 696         struct sigaction sa;
 697         struct config conf;
 698
 699         /* signal mask */
 700         sigset_t ss;
 701
 702         /* maximum file descriptor number */
 703         int cur_fd, max_fd = 0;
 704
 705 #ifdef HAVE_TLS
 706         int tls = 0;
 707         int keys = 0;
 708 #endif
 709
 710         int bound = 0;
 711         int nofork = 0;
 712
 713         /* args */
 714         int opt;
 715         char bind[128];
 716         char *port = NULL;
 717
 718 #ifdef HAVE_LUA
 719         /* library handle */
 720         void *lib;
 721 #endif
 722
 723         FD_ZERO(&serv_fds);
 724
 725         /* handle SIGPIPE, SIGINT, SIGTERM, SIGCHLD */
 726         sa.sa_flags = 0;
 727         sigemptyset(&sa.sa_mask);
 728
 729         sa.sa_handler = SIG_IGN;
 730         sigaction(SIGPIPE, &sa, NULL);
 731
 732         sa.sa_handler = uh_sigchld;
 733         sigaction(SIGCHLD, &sa, NULL);
 734
 735         sa.sa_handler = uh_sigterm;
 736         sigaction(SIGINT,  &sa, NULL);
 737         sigaction(SIGTERM, &sa, NULL);
 738
 739         /* defer SIGCHLD */
 740         sigemptyset(&ss);
 741         sigaddset(&ss, SIGCHLD);
 742         sigprocmask(SIG_BLOCK, &ss, NULL);
 743
 744         /* prepare addrinfo hints */
 745         memset(&hints, 0, sizeof(hints));
 746         hints.ai_family   = AF_UNSPEC;
 747         hints.ai_socktype = SOCK_STREAM;
 748         hints.ai_flags    = AI_PASSIVE;
 749
 750         /* parse args */
 751         memset(&conf, 0, sizeof(conf));
 752         memset(bind, 0, sizeof(bind));
 753
 754
 755         while( (opt = getopt(argc, argv,
 756                 "fSDRC:K:E:I:p:s:h:c:l:L:d:r:m:x:i:t:T:A:")) > 0
 757         ) {
 758                 switch(opt)
 759                 {
 760                         /* [addr:]port */
 761                         case 'p':
 762                         case 's':
 763                                 if( (port = strrchr(optarg, ':')) != NULL )
 764                                 {
 765                                         if( (optarg[0] == '[') && (port > optarg) && (port[-1] == ']') )
 766                                                 memcpy(bind, optarg + 1,
 767                                                         min(sizeof(bind), (int)(port - optarg) - 2));
 768                                         else
 769                                                 memcpy(bind, optarg,
 770                                                         min(sizeof(bind), (int)(port - optarg)));
 771
 772                                         port++;
 773                                 }
 774                                 else
 775                                 {
 776                                         port = optarg;
 777                                 }
 778
 779 #ifdef HAVE_TLS
 780                                 if( opt == 's' )
 781                                 {
 782                                         if( uh_inittls(&conf) )
 783                                         {
 784                                                 fprintf(stderr,
 785                                                         "Notice: TLS support is disabled, "
 786                                                         "ignoring '-s %s'\n", optarg
 787                                                 );
 788                                                 continue;
 789                                         }
 790
 791                                         tls = 1;
 792                                 }
 793 #endif
 794
 795                                 /* bind sockets */
 796                                 bound += uh_socket_bind(
 797                                         &serv_fds, &max_fd, bind[0] ? bind : NULL, port,
 798                                         &hints, (opt == 's'), &conf
 799                                 );
 800
 801                                 memset(bind, 0, sizeof(bind));
 802                                 break;
 803
 804 #ifdef HAVE_TLS
 805                         /* certificate */
 806                         case 'C':
 807                                 if( !uh_inittls(&conf) )
 808                                 {
 809                                         if( conf.tls_cert(conf.tls, optarg) < 1 )
 810                                         {
 811                                                 fprintf(stderr,
 812                                                         "Error: Invalid certificate file given\n");
 813                                                 exit(1);
 814                                         }
 815
 816                                         keys++;
 817                                 }
 818
 819                                 break;
 820
 821                         /* key */
 822                         case 'K':
 823                                 if( !uh_inittls(&conf) )
 824                                 {
 825                                         if( conf.tls_key(conf.tls, optarg) < 1 )
 826                                         {
 827                                                 fprintf(stderr,
 828                                                         "Error: Invalid private key file given\n");
 829                                                 exit(1);
 830                                         }
 831
 832                                         keys++;
 833                                 }
 834
 835                                 break;
 836 #endif
 837
 838                         /* docroot */
 839                         case 'h':
 840                                 if( ! realpath(optarg, conf.docroot) )
 841                                 {
 842                                         fprintf(stderr, "Error: Invalid directory %s: %s\n",
 843                                                 optarg, strerror(errno));
 844                                         exit(1);
 845                                 }
 846                                 break;
 847
 848                         /* error handler */
 849                         case 'E':
 850                                 if( (strlen(optarg) == 0) || (optarg[0] != '/') )
 851                                 {
 852                                         fprintf(stderr, "Error: Invalid error handler: %s\n",
 853                                                 optarg);
 854                                         exit(1);
 855                                 }
 856                                 conf.error_handler = optarg;
 857                                 break;
 858
 859                         /* index file */
 860                         case 'I':
 861                                 if( (strlen(optarg) == 0) || (optarg[0] == '/') )
 862                                 {
 863                                         fprintf(stderr, "Error: Invalid index page: %s\n",
 864                                                 optarg);
 865                                         exit(1);
 866                                 }
 867                                 conf.index_file = optarg;
 868                                 break;
 869
 870                         /* don't follow symlinks */
 871                         case 'S':
 872                                 conf.no_symlinks = 1;
 873                                 break;
 874
 875                         /* don't list directories */
 876                         case 'D':
 877                                 conf.no_dirlists = 1;
 878                                 break;
 879
 880                         case 'R':
 881                                 conf.rfc1918_filter = 1;
 882                                 break;
 883
 884 #ifdef HAVE_CGI
 885                         /* cgi prefix */
 886                         case 'x':
 887                                 conf.cgi_prefix = optarg;
 888                                 break;
 889
 890                         /* interpreter */
 891                         case 'i':
 892                                 if( (optarg[0] == '.') && (port = strchr(optarg, '=')) )
 893                                 {
 894                                         *port++ = 0;
 895                                         uh_interpreter_add(optarg, port);
 896                                 }
 897                                 else
 898                                 {
 899                                         fprintf(stderr, "Error: Invalid interpreter: %s\n",
 900                                                 optarg);
 901                                         exit(1);
 902                                 }
 903                                 break;
 904 #endif
 905
 906 #ifdef HAVE_LUA
 907                         /* lua prefix */
 908                         case 'l':
 909                                 conf.lua_prefix = optarg;
 910                                 break;
 911
 912                         /* lua handler */
 913                         case 'L':
 914                                 conf.lua_handler = optarg;
 915                                 break;
 916 #endif
 917
 918 #if defined(HAVE_CGI) || defined(HAVE_LUA)
 919                         /* script timeout */
 920                         case 't':
 921                                 conf.script_timeout = atoi(optarg);
 922                                 break;
 923 #endif
 924
 925                         /* network timeout */
 926                         case 'T':
 927                                 conf.network_timeout = atoi(optarg);
 928                                 break;
 929
 930                         /* tcp keep-alive */
 931                         case 'A':
 932                                 conf.tcp_keepalive = atoi(optarg);
 933                                 break;
 934
 935                         /* no fork */
 936                         case 'f':
 937                                 nofork = 1;
 938                                 break;
 939
 940                         /* urldecode */
 941                         case 'd':
 942                                 if( (port = malloc(strlen(optarg)+1)) != NULL )
 943                                 {
 944                                         /* "decode" plus to space to retain compat */
 945                                         for (opt = 0; optarg[opt]; opt++)
 946                                                 if (optarg[opt] == '+')
 947                                                         optarg[opt] = ' ';
 948
 949                                         memset(port, 0, strlen(optarg)+1);
 950                                         uh_urldecode(port, strlen(optarg), optarg, strlen(optarg));
 951
 952                                         printf("%s", port);
 953                                         free(port);
 954                                         exit(0);
 955                                 }
 956                                 break;
 957
 958                         /* basic auth realm */
 959                         case 'r':
 960                                 conf.realm = optarg;
 961                                 break;
 962
 963                         /* md5 crypt */
 964                         case 'm':
 965                                 printf("%s\n", crypt(optarg, "$1$"));
 966                                 exit(0);
 967                                 break;
 968
 969                         /* config file */
 970                         case 'c':
 971                                 conf.file = optarg;
 972                                 break;
 973
 974                         default:
 975                                 fprintf(stderr,
 976                                         "Usage: %s -p [addr:]port [-h docroot]\n"
 977                                         "       -f              Do not fork to background\n"
 978                                         "       -c file         Configuration file, default is '/etc/httpd.conf'\n"
 979                                         "       -p [addr:]port  Bind to specified address and port, multiple allowed\n"
 980 #ifdef HAVE_TLS
 981                                         "       -s [addr:]port  Like -p but provide HTTPS on this port\n"
 982                                         "       -C file         ASN.1 server certificate file\n"
 983                                         "       -K file         ASN.1 server private key file\n"
 984 #endif
 985                                         "       -h directory    Specify the document root, default is '.'\n"
 986                                         "       -E string       Use given virtual URL as 404 error handler\n"
 987                                         "       -I string       Use given filename as index page for directories\n"
 988                                         "       -S              Do not follow symbolic links outside of the docroot\n"
 989                                         "       -D              Do not allow directory listings, send 403 instead\n"
 990                                         "       -R              Enable RFC1918 filter\n"
 991 #ifdef HAVE_LUA
 992                                         "       -l string       URL prefix for Lua handler, default is '/lua'\n"
 993                                         "       -L file         Lua handler script, omit to disable Lua\n"
 994 #endif
 995 #ifdef HAVE_CGI
 996                                         "       -x string       URL prefix for CGI handler, default is '/cgi-bin'\n"
 997                                         "       -i .ext=path    Use interpreter at path for files with the given extension\n"
 998 #endif
 999 #if defined(HAVE_CGI) || defined(HAVE_LUA)
1000                                         "       -t seconds      CGI and Lua script timeout in seconds, default is 60\n"
1001 #endif
1002                                         "       -T seconds      Network timeout in seconds, default is 30\n"
1003                                         "       -d string       URL decode given string\n"
1004                                         "       -r string       Specify basic auth realm\n"
1005                                         "       -m string       MD5 crypt given string\n"
1006                                         "\n", argv[0]
1007                                 );
1008
1009                                 exit(1);
1010                 }
1011         }
1012
1013 #ifdef HAVE_TLS
1014         if( (tls == 1) && (keys < 2) )
1015         {
1016                 fprintf(stderr, "Error: Missing private key or certificate file\n");
1017                 exit(1);
1018         }
1019 #endif
1020
1021         if( bound < 1 )
1022         {
1023                 fprintf(stderr, "Error: No sockets bound, unable to continue\n");
1024                 exit(1);
1025         }
1026
1027         /* default docroot */
1028         if( !conf.docroot[0] && !realpath(".", conf.docroot) )
1029         {
1030                 fprintf(stderr, "Error: Can not determine default document root: %s\n",
1031                         strerror(errno));
1032                 exit(1);
1033         }
1034
1035         /* default realm */
1036         if( ! conf.realm )
1037                 conf.realm = "Protected Area";
1038
1039         /* config file */
1040         uh_config_parse(&conf);
1041
1042         /* default network timeout */
1043         if( conf.network_timeout <= 0 )
1044                 conf.network_timeout = 30;
1045
1046 #if defined(HAVE_CGI) || defined(HAVE_LUA)
1047         /* default script timeout */
1048         if( conf.script_timeout <= 0 )
1049                 conf.script_timeout = 60;
1050 #endif
1051
1052 #ifdef HAVE_CGI
1053         /* default cgi prefix */
1054         if( ! conf.cgi_prefix )
1055                 conf.cgi_prefix = "/cgi-bin";
1056 #endif
1057
1058 #ifdef HAVE_LUA
1059         /* load Lua plugin */
1060         if( ! (lib = dlopen("uhttpd_lua.so", RTLD_LAZY | RTLD_GLOBAL)) )
1061         {
1062                 fprintf(stderr,
1063                         "Notice: Unable to load Lua plugin - disabling Lua support! "
1064                         "(Reason: %s)\n", dlerror()
1065                 );
1066         }
1067         else
1068         {
1069                 /* resolve functions */
1070                 if( !(conf.lua_init    = dlsym(lib, "uh_lua_init"))    ||
1071                     !(conf.lua_close   = dlsym(lib, "uh_lua_close"))   ||
1072                     !(conf.lua_request = dlsym(lib, "uh_lua_request"))
1073                 ) {
1074                         fprintf(stderr,
1075                                 "Error: Failed to lookup required symbols "
1076                                 "in Lua plugin: %s\n", dlerror()
1077                         );
1078                         exit(1);
1079                 }
1080
1081                 /* init Lua runtime if handler is specified */
1082                 if( conf.lua_handler )
1083                 {
1084                         /* default lua prefix */
1085                         if( ! conf.lua_prefix )
1086                                 conf.lua_prefix = "/lua";
1087
1088                         conf.lua_state = conf.lua_init(conf.lua_handler);
1089                 }
1090         }
1091 #endif
1092
1093         /* fork (if not disabled) */
1094         if( ! nofork )
1095         {
1096                 switch( fork() )
1097                 {
1098                         case -1:
1099                                 perror("fork()");
1100                                 exit(1);
1101
1102                         case 0:
1103                                 /* daemon setup */
1104                                 if( chdir("/") )
1105                                         perror("chdir()");
1106
1107                                 if( (cur_fd = open("/dev/null", O_WRONLY)) > -1 )
1108                                         dup2(cur_fd, 0);
1109
1110                                 if( (cur_fd = open("/dev/null", O_RDONLY)) > -1 )
1111                                         dup2(cur_fd, 1);
1112
1113                                 if( (cur_fd = open("/dev/null", O_RDONLY)) > -1 )
1114                                         dup2(cur_fd, 2);
1115
1116                                 break;
1117
1118                         default:
1119                                 exit(0);
1120                 }
1121         }
1122
1123         /* server main loop */
1124         uh_mainloop(&conf, serv_fds, max_fd);
1125
1126 #ifdef HAVE_LUA
1127         /* destroy the Lua state */
1128         if( conf.lua_state != NULL )
1129                 conf.lua_close(conf.lua_state);
1130 #endif
1131
1132         return 0;
1133 }