| 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 | } |
| 1134 | |
