1/* vi: set sw=4 ts=4: */ 2/* 3 * httpd implementation for busybox 4 * 5 * Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org> 6 * Copyright (C) 2003-2006 Vladimir Oleynik <dzo@simtreas.ru> 7 * 8 * simplify patch stolen from libbb without using strdup 9 * 10 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. 11 * 12 ***************************************************************************** 13 * 14 * Typical usage: 15 * for non root user 16 * httpd -p 8080 -h $HOME/public_html 17 * or for daemon start from rc script with uid=0: 18 * httpd -u www 19 * This is equivalent if www user have uid=80 to 20 * httpd -p 80 -u 80 -h /www -c /etc/httpd.conf -r "Web Server Authentication" 21 * 22 * 23 * When an url starts by "/cgi-bin/" it is assumed to be a cgi script. The 24 * server changes directory to the location of the script and executes it 25 * after setting QUERY_STRING and other environment variables. 26 * 27 * Doc: 28 * "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html 29 * 30 * The applet can also be invoked as an url arg decoder and html text encoder 31 * as follows: 32 * foo=`httpd -d $foo` # decode "Hello%20World" as "Hello World" 33 * bar=`httpd -e "<Hello World>"` # encode as "<Hello World>" 34 * Note that url encoding for arguments is not the same as html encoding for 35 * presentation. -d decodes an url-encoded argument while -e encodes in html 36 * for page display. 37 * 38 * httpd.conf has the following format: 39 * 40 * H:/serverroot # define the server root. It will override -h 41 * A:172.20. # Allow address from 172.20.0.0/16 42 * A:10.0.0.0/25 # Allow any address from 10.0.0.0-10.0.0.127 43 * A:10.0.0.0/255.255.255.128 # Allow any address that previous set 44 * A:127.0.0.1 # Allow local loopback connections 45 * D:* # Deny from other IP connections 46 * E404:/path/e404.html # /path/e404.html is the 404 (not found) error page 47 * I:index.html # Show index.html when a directory is requested 48 * 49 * P:/url:[http://]hostname[:port]/new/path 50 * # When /urlXXXXXX is requested, reverse proxy 51 * # it to http://hostname[:port]/new/pathXXXXXX 52 * 53 * /cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/ 54 * /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/ 55 * /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/ 56 * .au:audio/basic # additional mime type for audio.au files 57 * *.php:/path/php # run xxx.php through an interpreter 58 * 59 * A/D may be as a/d or allow/deny - only first char matters. 60 * Deny/Allow IP logic: 61 * - Default is to allow all (Allow all (A:*) is a no-op). 62 * - Deny rules take precedence over allow rules. 63 * - "Deny all" rule (D:*) is applied last. 64 * 65 * Example: 66 * 1. Allow only specified addresses 67 * A:172.20 # Allow any address that begins with 172.20. 68 * A:10.10. # Allow any address that begins with 10.10. 69 * A:127.0.0.1 # Allow local loopback connections 70 * D:* # Deny from other IP connections 71 * 72 * 2. Only deny specified addresses 73 * D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255 74 * D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255 75 * A:* # (optional line added for clarity) 76 * 77 * If a sub directory contains a config file it is parsed and merged with 78 * any existing settings as if it was appended to the original configuration. 79 * 80 * subdir paths are relative to the containing subdir and thus cannot 81 * affect the parent rules. 82 * 83 * Note that since the sub dir is parsed in the forked thread servicing the 84 * subdir http request, any merge is discarded when the process exits. As a 85 * result, the subdir settings only have a lifetime of a single request. 86 * 87 * Custom error pages can contain an absolute path or be relative to 88 * 'home_httpd'. Error pages are to be static files (no CGI or script). Error 89 * page can only be defined in the root configuration file and are not taken 90 * into account in local (directories) config files. 91 * 92 * If -c is not set, an attempt will be made to open the default 93 * root configuration file. If -c is set and the file is not found, the 94 * server exits with an error. 95 * 96 */ 97 /* TODO: use TCP_CORK, parse_config() */ 98 99#include "libbb.h" 100#if ENABLE_FEATURE_HTTPD_USE_SENDFILE 101# include <sys/sendfile.h> 102#endif 103 104#define DEBUG 0 105 106#define IOBUF_SIZE 8192 /* IO buffer */ 107 108/* amount of buffering in a pipe */ 109#ifndef PIPE_BUF 110# define PIPE_BUF 4096 111#endif 112#if PIPE_BUF >= IOBUF_SIZE 113# error "PIPE_BUF >= IOBUF_SIZE" 114#endif 115 116#define HEADER_READ_TIMEOUT 60 117 118static const char DEFAULT_PATH_HTTPD_CONF[] ALIGN1 = "/etc"; 119static const char HTTPD_CONF[] ALIGN1 = "httpd.conf"; 120static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n"; 121 122typedef struct has_next_ptr { 123 struct has_next_ptr *next; 124} has_next_ptr; 125 126/* Must have "next" as a first member */ 127typedef struct Htaccess { 128 struct Htaccess *next; 129 char *after_colon; 130 char before_colon[1]; /* really bigger, must be last */ 131} Htaccess; 132 133/* Must have "next" as a first member */ 134typedef struct Htaccess_IP { 135 struct Htaccess_IP *next; 136 unsigned ip; 137 unsigned mask; 138 int allow_deny; 139} Htaccess_IP; 140 141/* Must have "next" as a first member */ 142typedef struct Htaccess_Proxy { 143 struct Htaccess_Proxy *next; 144 char *url_from; 145 char *host_port; 146 char *url_to; 147} Htaccess_Proxy; 148 149enum { 150 HTTP_OK = 200, 151 HTTP_PARTIAL_CONTENT = 206, 152 HTTP_MOVED_TEMPORARILY = 302, 153 HTTP_BAD_REQUEST = 400, /* malformed syntax */ 154 HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */ 155 HTTP_NOT_FOUND = 404, 156 HTTP_FORBIDDEN = 403, 157 HTTP_REQUEST_TIMEOUT = 408, 158 HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */ 159 HTTP_INTERNAL_SERVER_ERROR = 500, 160 HTTP_CONTINUE = 100, 161#if 0 /* future use */ 162 HTTP_SWITCHING_PROTOCOLS = 101, 163 HTTP_CREATED = 201, 164 HTTP_ACCEPTED = 202, 165 HTTP_NON_AUTHORITATIVE_INFO = 203, 166 HTTP_NO_CONTENT = 204, 167 HTTP_MULTIPLE_CHOICES = 300, 168 HTTP_MOVED_PERMANENTLY = 301, 169 HTTP_NOT_MODIFIED = 304, 170 HTTP_PAYMENT_REQUIRED = 402, 171 HTTP_BAD_GATEWAY = 502, 172 HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */ 173 HTTP_RESPONSE_SETSIZE = 0xffffffff 174#endif 175}; 176 177static const uint16_t http_response_type[] ALIGN2 = { 178 HTTP_OK, 179#if ENABLE_FEATURE_HTTPD_RANGES 180 HTTP_PARTIAL_CONTENT, 181#endif 182 HTTP_MOVED_TEMPORARILY, 183 HTTP_REQUEST_TIMEOUT, 184 HTTP_NOT_IMPLEMENTED, 185#if ENABLE_FEATURE_HTTPD_BASIC_AUTH 186 HTTP_UNAUTHORIZED, 187#endif 188 HTTP_NOT_FOUND, 189 HTTP_BAD_REQUEST, 190 HTTP_FORBIDDEN, 191 HTTP_INTERNAL_SERVER_ERROR, 192#if 0 /* not implemented */ 193 HTTP_CREATED, 194 HTTP_ACCEPTED, 195 HTTP_NO_CONTENT, 196 HTTP_MULTIPLE_CHOICES, 197 HTTP_MOVED_PERMANENTLY, 198 HTTP_NOT_MODIFIED, 199 HTTP_BAD_GATEWAY, 200 HTTP_SERVICE_UNAVAILABLE, 201#endif 202}; 203 204static const struct { 205 const char *name; 206 const char *info; 207} http_response[ARRAY_SIZE(http_response_type)] = { 208 { "OK", NULL }, 209#if ENABLE_FEATURE_HTTPD_RANGES 210 { "Partial Content", NULL }, 211#endif 212 { "Found", NULL }, 213 { "Request Timeout", "No request appeared within 60 seconds" }, 214 { "Not Implemented", "The requested method is not recognized" }, 215#if ENABLE_FEATURE_HTTPD_BASIC_AUTH 216 { "Unauthorized", "" }, 217#endif 218 { "Not Found", "The requested URL was not found" }, 219 { "Bad Request", "Unsupported method" }, 220 { "Forbidden", "" }, 221 { "Internal Server Error", "Internal Server Error" }, 222#if 0 /* not implemented */ 223 { "Created" }, 224 { "Accepted" }, 225 { "No Content" }, 226 { "Multiple Choices" }, 227 { "Moved Permanently" }, 228 { "Not Modified" }, 229 { "Bad Gateway", "" }, 230 { "Service Unavailable", "" }, 231#endif 232}; 233 234static const char index_html[] ALIGN1 = "index.html"; 235 236 237struct globals { 238 int verbose; /* must be int (used by getopt32) */ 239 smallint flg_deny_all; 240 241 unsigned rmt_ip; /* used for IP-based allow/deny rules */ 242 time_t last_mod; 243 char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */ 244 const char *bind_addr_or_port; 245 246 const char *g_query; 247 const char *opt_c_configFile; 248 const char *home_httpd; 249 const char *index_page; 250 251 const char *found_mime_type; 252 const char *found_moved_temporarily; 253 Htaccess_IP *ip_a_d; /* config allow/deny lines */ 254 255 IF_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;) 256 IF_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;) 257 IF_FEATURE_HTTPD_CGI(char *referer;) 258 IF_FEATURE_HTTPD_CGI(char *user_agent;) 259 IF_FEATURE_HTTPD_CGI(char *host;) 260 IF_FEATURE_HTTPD_CGI(char *http_accept;) 261 IF_FEATURE_HTTPD_CGI(char *http_accept_language;) 262 263 off_t file_size; /* -1 - unknown */ 264#if ENABLE_FEATURE_HTTPD_RANGES 265 off_t range_start; 266 off_t range_end; 267 off_t range_len; 268#endif 269 270#if ENABLE_FEATURE_HTTPD_BASIC_AUTH 271 Htaccess *g_auth; /* config user:password lines */ 272#endif 273 Htaccess *mime_a; /* config mime types */ 274#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR 275 Htaccess *script_i; /* config script interpreters */ 276#endif 277 char *iobuf; /* [IOBUF_SIZE] */ 278#define hdr_buf bb_common_bufsiz1 279 char *hdr_ptr; 280 int hdr_cnt; 281#if ENABLE_FEATURE_HTTPD_ERROR_PAGES 282 const char *http_error_page[ARRAY_SIZE(http_response_type)]; 283#endif 284#if ENABLE_FEATURE_HTTPD_PROXY 285 Htaccess_Proxy *proxy; 286#endif 287}; 288#define G (*ptr_to_globals) 289#define verbose (G.verbose ) 290#define flg_deny_all (G.flg_deny_all ) 291#define rmt_ip (G.rmt_ip ) 292#define bind_addr_or_port (G.bind_addr_or_port) 293#define g_query (G.g_query ) 294#define opt_c_configFile (G.opt_c_configFile ) 295#define home_httpd (G.home_httpd ) 296#define index_page (G.index_page ) 297#define found_mime_type (G.found_mime_type ) 298#define found_moved_temporarily (G.found_moved_temporarily) 299#define last_mod (G.last_mod ) 300#define ip_a_d (G.ip_a_d ) 301#define g_realm (G.g_realm ) 302#define remoteuser (G.remoteuser ) 303#define referer (G.referer ) 304#define user_agent (G.user_agent ) 305#define host (G.host ) 306#define http_accept (G.http_accept ) 307#define http_accept_language (G.http_accept_language) 308#define file_size (G.file_size ) 309#if ENABLE_FEATURE_HTTPD_RANGES 310#define range_start (G.range_start ) 311#define range_end (G.range_end ) 312#define range_len (G.range_len ) 313#else 314enum { 315 range_start = 0, 316 range_end = MAXINT(off_t) - 1, 317 range_len = MAXINT(off_t), 318}; 319#endif 320#define rmt_ip_str (G.rmt_ip_str ) 321#define g_auth (G.g_auth ) 322#define mime_a (G.mime_a ) 323#define script_i (G.script_i ) 324#define iobuf (G.iobuf ) 325#define hdr_ptr (G.hdr_ptr ) 326#define hdr_cnt (G.hdr_cnt ) 327#define http_error_page (G.http_error_page ) 328#define proxy (G.proxy ) 329#define INIT_G() do { \ 330 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ 331 IF_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \ 332 bind_addr_or_port = "80"; \ 333 index_page = index_html; \ 334 file_size = -1; \ 335} while (0) 336 337 338#define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1) 339 340/* Prototypes */ 341enum { 342 SEND_HEADERS = (1 << 0), 343 SEND_BODY = (1 << 1), 344 SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY, 345}; 346static void send_file_and_exit(const char *url, int what) NORETURN; 347 348static void free_llist(has_next_ptr **pptr) 349{ 350 has_next_ptr *cur = *pptr; 351 while (cur) { 352 has_next_ptr *t = cur; 353 cur = cur->next; 354 free(t); 355 } 356 *pptr = NULL; 357} 358 359static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr) 360{ 361 free_llist((has_next_ptr**)pptr); 362} 363 364static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr) 365{ 366 free_llist((has_next_ptr**)pptr); 367} 368 369/* Returns presumed mask width in bits or < 0 on error. 370 * Updates strp, stores IP at provided pointer */ 371static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc) 372{ 373 const char *p = *strp; 374 int auto_mask = 8; 375 unsigned ip = 0; 376 int j; 377 378 if (*p == '/') 379 return -auto_mask; 380 381 for (j = 0; j < 4; j++) { 382 unsigned octet; 383 384 if ((*p < '0' || *p > '9') && *p != '/' && *p) 385 return -auto_mask; 386 octet = 0; 387 while (*p >= '0' && *p <= '9') { 388 octet *= 10; 389 octet += *p - '0'; 390 if (octet > 255) 391 return -auto_mask; 392 p++; 393 } 394 if (*p == '.') 395 p++; 396 if (*p != '/' && *p) 397 auto_mask += 8; 398 ip = (ip << 8) | octet; 399 } 400 if (*p) { 401 if (*p != endc) 402 return -auto_mask; 403 p++; 404 if (*p == '\0') 405 return -auto_mask; 406 } 407 *ipp = ip; 408 *strp = p; 409 return auto_mask; 410} 411 412/* Returns 0 on success. Stores IP and mask at provided pointers */ 413static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp) 414{ 415 int i; 416 unsigned mask; 417 char *p; 418 419 i = scan_ip(&str, ipp, '/'); 420 if (i < 0) 421 return i; 422 423 if (*str) { 424 /* there is /xxx after dotted-IP address */ 425 i = bb_strtou(str, &p, 10); 426 if (*p == '.') { 427 /* 'xxx' itself is dotted-IP mask, parse it */ 428 /* (return 0 (success) only if it has N.N.N.N form) */ 429 return scan_ip(&str, maskp, '\0') - 32; 430 } 431 if (*p) 432 return -1; 433 } 434 435 if (i > 32) 436 return -1; 437 438 if (sizeof(unsigned) == 4 && i == 32) { 439 /* mask >>= 32 below may not work */ 440 mask = 0; 441 } else { 442 mask = 0xffffffff; 443 mask >>= i; 444 } 445 /* i == 0 -> *maskp = 0x00000000 446 * i == 1 -> *maskp = 0x80000000 447 * i == 4 -> *maskp = 0xf0000000 448 * i == 31 -> *maskp = 0xfffffffe 449 * i == 32 -> *maskp = 0xffffffff */ 450 *maskp = (uint32_t)(~mask); 451 return 0; 452} 453 454/* 455 * Parse configuration file into in-memory linked list. 456 * 457 * Any previous IP rules are discarded. 458 * If the flag argument is not SUBDIR_PARSE then all /path and mime rules 459 * are also discarded. That is, previous settings are retained if flag is 460 * SUBDIR_PARSE. 461 * Error pages are only parsed on the main config file. 462 * 463 * path Path where to look for httpd.conf (without filename). 464 * flag Type of the parse request. 465 */ 466/* flag param: */ 467enum { 468 FIRST_PARSE = 0, /* path will be "/etc" */ 469 SIGNALED_PARSE = 1, /* path will be "/etc" */ 470 SUBDIR_PARSE = 2, /* path will be derived from URL */ 471}; 472static void parse_conf(const char *path, int flag) 473{ 474 /* internally used extra flag state */ 475 enum { TRY_CURDIR_PARSE = 3 }; 476 477 FILE *f; 478 const char *filename; 479 char buf[160]; 480 481 /* discard old rules */ 482 free_Htaccess_IP_list(&ip_a_d); 483 flg_deny_all = 0; 484 /* retain previous auth and mime config only for subdir parse */ 485 if (flag != SUBDIR_PARSE) { 486 free_Htaccess_list(&mime_a); 487#if ENABLE_FEATURE_HTTPD_BASIC_AUTH 488 free_Htaccess_list(&g_auth); 489#endif 490#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR 491 free_Htaccess_list(&script_i); 492#endif 493 } 494 495 filename = opt_c_configFile; 496 if (flag == SUBDIR_PARSE || filename == NULL) { 497 filename = alloca(strlen(path) + sizeof(HTTPD_CONF) + 2); 498 sprintf((char *)filename, "%s/%s", path, HTTPD_CONF); 499 } 500 501 while ((f = fopen_for_read(filename)) == NULL) { 502 if (flag >= SUBDIR_PARSE) { /* SUBDIR or TRY_CURDIR */ 503 /* config file not found, no changes to config */ 504 return; 505 } 506 if (flag == FIRST_PARSE) { 507 /* -c CONFFILE given, but CONFFILE doesn't exist? */ 508 if (opt_c_configFile) 509 bb_simple_perror_msg_and_die(opt_c_configFile); 510 /* else: no -c, thus we looked at /etc/httpd.conf, 511 * and it's not there. try ./httpd.conf: */ 512 } 513 flag = TRY_CURDIR_PARSE; 514 filename = HTTPD_CONF; 515 } 516 517#if ENABLE_FEATURE_HTTPD_BASIC_AUTH 518 /* in "/file:user:pass" lines, we prepend path in subdirs */ 519 if (flag != SUBDIR_PARSE) 520 path = ""; 521#endif 522 /* The lines can be: 523 * 524 * I:default_index_file 525 * H:http_home 526 * [AD]:IP[/mask] # allow/deny, * for wildcard 527 * Ennn:error.html # error page for status nnn 528 * P:/url:[http://]hostname[:port]/new/path # reverse proxy 529 * .ext:mime/type # mime type 530 * *.php:/path/php # run xxx.php through an interpreter 531 * /file:user:pass # username and password 532 */ 533 while (fgets(buf, sizeof(buf), f) != NULL) { 534 unsigned strlen_buf; 535 unsigned char ch; 536 char *after_colon; 537 538 { /* remove all whitespace, and # comments */ 539 char *p, *p0; 540 541 p0 = buf; 542 /* skip non-whitespace beginning. Often the whole line 543 * is non-whitespace. We want this case to work fast, 544 * without needless copying, therefore we don't merge 545 * this operation into next while loop. */ 546 while ((ch = *p0) != '\0' && ch != '\n' && ch != '#' 547 && ch != ' ' && ch != '\t' 548 ) { 549 p0++; 550 } 551 p = p0; 552 /* if we enter this loop, we have some whitespace. 553 * discard it */ 554 while (ch != '\0' && ch != '\n' && ch != '#') { 555 if (ch != ' ' && ch != '\t') { 556 *p++ = ch; 557 } 558 ch = *++p0; 559 } 560 *p = '\0'; 561 strlen_buf = p - buf; 562 if (strlen_buf == 0) 563 continue; /* empty line */ 564 } 565 566 after_colon = strchr(buf, ':'); 567 /* strange line? */ 568 if (after_colon == NULL || *++after_colon == '\0') 569 goto config_error; 570 571 ch = (buf[0] & ~0x20); /* toupper if it's a letter */ 572 573 if (ch == 'I') { 574 if (index_page != index_html) 575 free((char*)index_page); 576 index_page = xstrdup(after_colon); 577 continue; 578 } 579 580 /* do not allow jumping around using H in subdir's configs */ 581 if (flag == FIRST_PARSE && ch == 'H') { 582 home_httpd = xstrdup(after_colon); 583 xchdir(home_httpd); 584 continue; 585 } 586 587 if (ch == 'A' || ch == 'D') { 588 Htaccess_IP *pip; 589 590 if (*after_colon == '*') { 591 if (ch == 'D') { 592 /* memorize "deny all" */ 593 flg_deny_all = 1; 594 } 595 /* skip assumed "A:*", it is a default anyway */ 596 continue; 597 } 598 /* store "allow/deny IP/mask" line */ 599 pip = xzalloc(sizeof(*pip)); 600 if (scan_ip_mask(after_colon, &pip->ip, &pip->mask)) { 601 /* IP{/mask} syntax error detected, protect all */ 602 ch = 'D'; 603 pip->mask = 0; 604 } 605 pip->allow_deny = ch; 606 if (ch == 'D') { 607 /* Deny:from_IP - prepend */ 608 pip->next = ip_a_d; 609 ip_a_d = pip; 610 } else { 611 /* A:from_IP - append (thus all D's precedes A's) */ 612 Htaccess_IP *prev_IP = ip_a_d; 613 if (prev_IP == NULL) { 614 ip_a_d = pip; 615 } else { 616 while (prev_IP->next) 617 prev_IP = prev_IP->next; 618 prev_IP->next = pip; 619 } 620 } 621 continue; 622 } 623 624#if ENABLE_FEATURE_HTTPD_ERROR_PAGES 625 if (flag == FIRST_PARSE && ch == 'E') { 626 unsigned i; 627 int status = atoi(buf + 1); /* error status code */ 628 629 if (status < HTTP_CONTINUE) { 630 goto config_error; 631 } 632 /* then error page; find matching status */ 633 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) { 634 if (http_response_type[i] == status) { 635 /* We chdir to home_httpd, thus no need to 636 * concat_path_file(home_httpd, after_colon) 637 * here */ 638 http_error_page[i] = xstrdup(after_colon); 639 break; 640 } 641 } 642 continue; 643 } 644#endif 645 646#if ENABLE_FEATURE_HTTPD_PROXY 647 if (flag == FIRST_PARSE && ch == 'P') { 648 /* P:/url:[http://]hostname[:port]/new/path */ 649 char *url_from, *host_port, *url_to; 650 Htaccess_Proxy *proxy_entry; 651 652 url_from = after_colon; 653 host_port = strchr(after_colon, ':'); 654 if (host_port == NULL) { 655 goto config_error; 656 } 657 *host_port++ = '\0'; 658 if (strncmp(host_port, "http://", 7) == 0) 659 host_port += 7; 660 if (*host_port == '\0') { 661 goto config_error; 662 } 663 url_to = strchr(host_port, '/'); 664 if (url_to == NULL) { 665 goto config_error; 666 } 667 *url_to = '\0'; 668 proxy_entry = xzalloc(sizeof(*proxy_entry)); 669 proxy_entry->url_from = xstrdup(url_from); 670 proxy_entry->host_port = xstrdup(host_port); 671 *url_to = '/'; 672 proxy_entry->url_to = xstrdup(url_to); 673 proxy_entry->next = proxy; 674 proxy = proxy_entry; 675 continue; 676 } 677#endif 678 /* the rest of directives are non-alphabetic, 679 * must avoid using "toupper'ed" ch */ 680 ch = buf[0]; 681 682 if (ch == '.' /* ".ext:mime/type" */ 683#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR 684 || (ch == '*' && buf[1] == '.') /* "*.php:/path/php" */ 685#endif 686 ) { 687 char *p; 688 Htaccess *cur; 689 690 cur = xzalloc(sizeof(*cur) /* includes space for NUL */ + strlen_buf); 691 strcpy(cur->before_colon, buf); 692 p = cur->before_colon + (after_colon - buf); 693 p[-1] = '\0'; 694 cur->after_colon = p; 695 if (ch == '.') { 696 /* .mime line: prepend to mime_a list */ 697 cur->next = mime_a; 698 mime_a = cur; 699 } 700#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR 701 else { 702 /* script interpreter line: prepend to script_i list */ 703 cur->next = script_i; 704 script_i = cur; 705 } 706#endif 707 continue; 708 } 709 710#if ENABLE_FEATURE_HTTPD_BASIC_AUTH 711 if (ch == '/') { /* "/file:user:pass" */ 712 char *p; 713 Htaccess *cur; 714 unsigned file_len; 715 716 /* note: path is "" unless we are in SUBDIR parse, 717 * otherwise it does NOT start with "/" */ 718 cur = xzalloc(sizeof(*cur) /* includes space for NUL */ 719 + 1 + strlen(path) 720 + strlen_buf 721 ); 722 /* form "/path/file" */ 723 sprintf(cur->before_colon, "/%s%.*s", 724 path, 725 (int) (after_colon - buf - 1), /* includes "/", but not ":" */ 726 buf); 727 /* canonicalize it */ 728 p = bb_simplify_abs_path_inplace(cur->before_colon); 729 file_len = p - cur->before_colon; 730 /* add "user:pass" after NUL */ 731 strcpy(++p, after_colon); 732 cur->after_colon = p; 733 734 /* insert cur into g_auth */ 735 /* g_auth is sorted by decreased filename length */ 736 { 737 Htaccess *auth, **authp; 738 739 authp = &g_auth; 740 while ((auth = *authp) != NULL) { 741 if (file_len >= strlen(auth->before_colon)) { 742 /* insert cur before auth */ 743 cur->next = auth; 744 break; 745 } 746 authp = &auth->next; 747 } 748 *authp = cur; 749 } 750 continue; 751 } 752#endif /* BASIC_AUTH */ 753 754 /* the line is not recognized */ 755 config_error: 756 bb_error_msg("config error '%s' in '%s'", buf, filename); 757 } /* while (fgets) */ 758 759 fclose(f); 760} 761 762#if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR 763/* 764 * Given a string, html-encode special characters. 765 * This is used for the -e command line option to provide an easy way 766 * for scripts to encode result data without confusing browsers. The 767 * returned string pointer is memory allocated by malloc(). 768 * 769 * Returns a pointer to the encoded string (malloced). 770 */ 771static char *encodeString(const char *string) 772{ 773 /* take the simple route and encode everything */ 774 /* could possibly scan once to get length. */ 775 int len = strlen(string); 776 char *out = xmalloc(len * 6 + 1); 777 char *p = out; 778 char ch; 779 780 while ((ch = *string++)) { 781 /* very simple check for what to encode */ 782 if (isalnum(ch)) 783 *p++ = ch; 784 else 785 p += sprintf(p, "&#%d;", (unsigned char) ch); 786 } 787 *p = '\0'; 788 return out; 789} 790#endif /* FEATURE_HTTPD_ENCODE_URL_STR */ 791 792/* 793 * Given a URL encoded string, convert it to plain ascii. 794 * Since decoding always makes strings smaller, the decode is done in-place. 795 * Thus, callers should xstrdup() the argument if they do not want the 796 * argument modified. The return is the original pointer, allowing this 797 * function to be easily used as arguments to other functions. 798 * 799 * string The first string to decode. 800 * option_d 1 if called for httpd -d 801 * 802 * Returns a pointer to the decoded string (same as input). 803 */ 804static unsigned hex_to_bin(unsigned char c) 805{ 806 unsigned v; 807 808 v = c - '0'; 809 if (v <= 9) 810 return v; 811 /* c | 0x20: letters to lower case, non-letters 812 * to (potentially different) non-letters */ 813 v = (unsigned)(c | 0x20) - 'a'; 814 if (v <= 5) 815 return v + 10; 816 return ~0; 817} 818/* For testing: 819void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); } 820int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f'); 821t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; } 822*/ 823static char *decodeString(char *orig, int option_d) 824{ 825 /* note that decoded string is always shorter than original */ 826 char *string = orig; 827 char *ptr = string; 828 char c; 829 830 while ((c = *ptr++) != '\0') { 831 unsigned v; 832 833 if (option_d && c == '+') { 834 *string++ = ' '; 835 continue; 836 } 837 if (c != '%') { 838 *string++ = c; 839 continue; 840 } 841 v = hex_to_bin(ptr[0]); 842 if (v > 15) { 843 bad_hex: 844 if (!option_d) 845 return NULL; 846 *string++ = '%'; 847 continue; 848 } 849 v = (v * 16) | hex_to_bin(ptr[1]); 850 if (v > 255) 851 goto bad_hex; 852 if (!option_d && (v == '/' || v == '\0')) { 853 /* caller takes it as indication of invalid 854 * (dangerous wrt exploits) chars */ 855 return orig + 1; 856 } 857 *string++ = v; 858 ptr += 2; 859 } 860 *string = '\0'; 861 return orig; 862} 863 864#if ENABLE_FEATURE_HTTPD_BASIC_AUTH 865/* 866 * Decode a base64 data stream as per rfc1521. 867 * Note that the rfc states that non base64 chars are to be ignored. 868 * Since the decode always results in a shorter size than the input, 869 * it is OK to pass the input arg as an output arg. 870 * Parameter: a pointer to a base64 encoded string. 871 * Decoded data is stored in-place. 872 */ 873static void decodeBase64(char *Data) 874{ 875 const unsigned char *in = (const unsigned char *)Data; 876 /* The decoded size will be at most 3/4 the size of the encoded */ 877 unsigned ch = 0; 878 int i = 0; 879 880 while (*in) { 881 int t = *in++; 882 883 if (t >= '0' && t <= '9') 884 t = t - '0' + 52; 885 else if (t >= 'A' && t <= 'Z') 886 t = t - 'A'; 887 else if (t >= 'a' && t <= 'z') 888 t = t - 'a' + 26; 889 else if (t == '+') 890 t = 62; 891 else if (t == '/') 892 t = 63; 893 else if (t == '=') 894 t = 0; 895 else 896 continue; 897 898 ch = (ch << 6) | t; 899 i++; 900 if (i == 4) { 901 *Data++ = (char) (ch >> 16); 902 *Data++ = (char) (ch >> 8); 903 *Data++ = (char) ch; 904 i = 0; 905 } 906 } 907 *Data = '\0'; 908} 909#endif 910 911/* 912 * Create a listen server socket on the designated port. 913 */ 914static int openServer(void) 915{ 916 unsigned n = bb_strtou(bind_addr_or_port, NULL, 10); 917 if (!errno && n && n <= 0xffff) 918 n = create_and_bind_stream_or_die(NULL, n); 919 else 920 n = create_and_bind_stream_or_die(bind_addr_or_port, 80); 921 xlisten(n, 9); 922 return n; 923} 924 925/* 926 * Log the connection closure and exit. 927 */ 928static void log_and_exit(void) NORETURN; 929static void log_and_exit(void) 930{ 931 /* Paranoia. IE said to be buggy. It may send some extra data 932 * or be confused by us just exiting without SHUT_WR. Oh well. */ 933 shutdown(1, SHUT_WR); 934 /* Why?? 935 (this also messes up stdin when user runs httpd -i from terminal) 936 ndelay_on(0); 937 while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0) 938 continue; 939 */ 940 941 if (verbose > 2) 942 bb_error_msg("closed"); 943 _exit(xfunc_error_retval); 944} 945 946/* 947 * Create and send HTTP response headers. 948 * The arguments are combined and sent as one write operation. Note that 949 * IE will puke big-time if the headers are not sent in one packet and the 950 * second packet is delayed for any reason. 951 * responseNum - the result code to send. 952 */ 953static void send_headers(int responseNum) 954{ 955 static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT"; 956 957 const char *responseString = ""; 958 const char *infoString = NULL; 959 const char *mime_type; 960#if ENABLE_FEATURE_HTTPD_ERROR_PAGES 961 const char *error_page = NULL; 962#endif 963 unsigned i; 964 time_t timer = time(NULL); 965 char tmp_str[80]; 966 int len; 967 968 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) { 969 if (http_response_type[i] == responseNum) { 970 responseString = http_response[i].name; 971 infoString = http_response[i].info; 972#if ENABLE_FEATURE_HTTPD_ERROR_PAGES 973 error_page = http_error_page[i]; 974#endif 975 break; 976 } 977 } 978 /* error message is HTML */ 979 mime_type = responseNum == HTTP_OK ? 980 found_mime_type : "text/html"; 981 982 if (verbose) 983 bb_error_msg("response:%u", responseNum); 984 985 /* emit the current date */ 986 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer)); 987 len = sprintf(iobuf, 988 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n" 989 "Date: %s\r\nConnection: close\r\n", 990 responseNum, responseString, mime_type, tmp_str); 991 992#if ENABLE_FEATURE_HTTPD_BASIC_AUTH 993 if (responseNum == HTTP_UNAUTHORIZED) { 994 len += sprintf(iobuf + len, 995 "WWW-Authenticate: Basic realm=\"%s\"\r\n", 996 g_realm); 997 } 998#endif 999 if (responseNum == HTTP_MOVED_TEMPORARILY) { 1000 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n", 1001 found_moved_temporarily, 1002 (g_query ? "?" : ""), 1003 (g_query ? g_query : "")); 1004 } 1005 1006#if ENABLE_FEATURE_HTTPD_ERROR_PAGES 1007 if (error_page && access(error_page, R_OK) == 0) { 1008 strcat(iobuf, "\r\n"); 1009 len += 2; 1010 1011 if (DEBUG) 1012 fprintf(stderr, "headers: '%s'\n", iobuf); 1013 full_write(STDOUT_FILENO, iobuf, len); 1014 if (DEBUG) 1015 fprintf(stderr, "writing error page: '%s'\n", error_page); 1016 return send_file_and_exit(error_page, SEND_BODY); 1017 } 1018#endif 1019 1020 if (file_size != -1) { /* file */ 1021 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod)); 1022#if ENABLE_FEATURE_HTTPD_RANGES 1023 if (responseNum == HTTP_PARTIAL_CONTENT) { 1024 len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"u-%"OFF_FMT"u/%"OFF_FMT"u\r\n", 1025 range_start, 1026 range_end, 1027 file_size); 1028 file_size = range_end - range_start + 1; 1029 } 1030#endif 1031 len += sprintf(iobuf + len, 1032#if ENABLE_FEATURE_HTTPD_RANGES 1033 "Accept-Ranges: bytes\r\n" 1034#endif 1035 "Last-Modified: %s\r\n%s %"OFF_FMT"u\r\n", 1036 tmp_str, 1037 "Content-length:", 1038 file_size 1039 ); 1040 } 1041 iobuf[len++] = '\r'; 1042 iobuf[len++] = '\n'; 1043 if (infoString) { 1044 len += sprintf(iobuf + len, 1045 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n" 1046 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n", 1047 responseNum, responseString, 1048 responseNum, responseString, infoString); 1049 } 1050 if (DEBUG) 1051 fprintf(stderr, "headers: '%s'\n", iobuf); 1052 if (full_write(STDOUT_FILENO, iobuf, len) != len) { 1053 if (verbose > 1) 1054 bb_perror_msg("error"); 1055 log_and_exit(); 1056 } 1057} 1058 1059static void send_headers_and_exit(int responseNum) NORETURN; 1060static void send_headers_and_exit(int responseNum) 1061{ 1062 send_headers(responseNum); 1063 log_and_exit(); 1064} 1065 1066/* 1067 * Read from the socket until '\n' or EOF. '\r' chars are removed. 1068 * '\n' is replaced with NUL. 1069 * Return number of characters read or 0 if nothing is read 1070 * ('\r' and '\n' are not counted). 1071 * Data is returned in iobuf. 1072 */ 1073static int get_line(void) 1074{ 1075 int count = 0; 1076 char c; 1077 1078 alarm(HEADER_READ_TIMEOUT); 1079 while (1) { 1080 if (hdr_cnt <= 0) { 1081 hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf)); 1082 if (hdr_cnt <= 0) 1083 break; 1084 hdr_ptr = hdr_buf; 1085 } 1086 iobuf[count] = c = *hdr_ptr++; 1087 hdr_cnt--; 1088 1089 if (c == '\r') 1090 continue; 1091 if (c == '\n') { 1092 iobuf[count] = '\0'; 1093 break; 1094 } 1095 if (count < (IOBUF_SIZE - 1)) /* check overflow */ 1096 count++; 1097 } 1098 return count; 1099} 1100 1101#if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY 1102 1103/* gcc 4.2.1 fares better with NOINLINE */ 1104static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN; 1105static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) 1106{ 1107 enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */ 1108 struct pollfd pfd[3]; 1109 int out_cnt; /* we buffer a bit of initial CGI output */ 1110 int count; 1111 1112 /* iobuf is used for CGI -> network data, 1113 * hdr_buf is for network -> CGI data (POSTDATA) */ 1114 1115 /* If CGI dies, we still want to correctly finish reading its output 1116 * and send it to the peer. So please no SIGPIPEs! */ 1117 signal(SIGPIPE, SIG_IGN); 1118 1119 // We inconsistently handle a case when more POSTDATA from network 1120 // is coming than we expected. We may give *some part* of that 1121 // extra data to CGI. 1122 1123 //if (hdr_cnt > post_len) { 1124 // /* We got more POSTDATA from network than we expected */ 1125 // hdr_cnt = post_len; 1126 //} 1127 post_len -= hdr_cnt; 1128 /* post_len - number of POST bytes not yet read from network */ 1129 1130 /* NB: breaking out of this loop jumps to log_and_exit() */ 1131 out_cnt = 0; 1132 while (1) { 1133 memset(pfd, 0, sizeof(pfd)); 1134 1135 pfd[FROM_CGI].fd = fromCgi_rd; 1136 pfd[FROM_CGI].events = POLLIN; 1137 1138 if (toCgi_wr) { 1139 pfd[TO_CGI].fd = toCgi_wr; 1140 if (hdr_cnt > 0) { 1141 pfd[TO_CGI].events = POLLOUT; 1142 } else if (post_len > 0) { 1143 pfd[0].events = POLLIN; 1144 } else { 1145 /* post_len <= 0 && hdr_cnt <= 0: 1146 * no more POST data to CGI, 1147 * let CGI see EOF on CGI's stdin */ 1148 if (toCgi_wr != fromCgi_rd) 1149 close(toCgi_wr); 1150 toCgi_wr = 0; 1151 } 1152 } 1153 1154 /* Now wait on the set of sockets */ 1155 count = safe_poll(pfd, toCgi_wr ? TO_CGI+1 : FROM_CGI+1, -1); 1156 if (count <= 0) { 1157#if 0 1158 if (safe_waitpid(pid, &status, WNOHANG) <= 0) { 1159 /* Weird. CGI didn't exit and no fd's 1160 * are ready, yet poll returned?! */ 1161 continue; 1162 } 1163 if (DEBUG && WIFEXITED(status)) 1164 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status)); 1165 if (DEBUG && WIFSIGNALED(status)) 1166 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status)); 1167#endif 1168 break; 1169 } 1170 1171 if (pfd[TO_CGI].revents) { 1172 /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */ 1173 /* Have data from peer and can write to CGI */ 1174 count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt); 1175 /* Doesn't happen, we dont use nonblocking IO here 1176 *if (count < 0 && errno == EAGAIN) { 1177 * ... 1178 *} else */ 1179 if (count > 0) { 1180 hdr_ptr += count; 1181 hdr_cnt -= count; 1182 } else { 1183 /* EOF/broken pipe to CGI, stop piping POST data */ 1184 hdr_cnt = post_len = 0; 1185 } 1186 } 1187 1188 if (pfd[0].revents) { 1189 /* post_len > 0 && hdr_cnt == 0 here */ 1190 /* We expect data, prev data portion is eaten by CGI 1191 * and there *is* data to read from the peer 1192 * (POSTDATA) */ 1193 //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len; 1194 //count = safe_read(STDIN_FILENO, hdr_buf, count); 1195 count = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf)); 1196 if (count > 0) { 1197 hdr_cnt = count; 1198 hdr_ptr = hdr_buf; 1199 post_len -= count; 1200 } else { 1201 /* no more POST data can be read */ 1202 post_len = 0; 1203 } 1204 } 1205 1206 if (pfd[FROM_CGI].revents) { 1207 /* There is something to read from CGI */ 1208 char *rbuf = iobuf; 1209 1210 /* Are we still buffering CGI output? */ 1211 if (out_cnt >= 0) { 1212 /* HTTP_200[] has single "\r\n" at the end. 1213 * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html, 1214 * CGI scripts MUST send their own header terminated by 1215 * empty line, then data. That's why we have only one 1216 * <cr><lf> pair here. We will output "200 OK" line 1217 * if needed, but CGI still has to provide blank line 1218 * between header and body */ 1219 1220 /* Must use safe_read, not full_read, because 1221 * CGI may output a few first bytes and then wait 1222 * for POSTDATA without closing stdout. 1223 * With full_read we may wait here forever. */ 1224 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8); 1225 if (count <= 0) { 1226 /* eof (or error) and there was no "HTTP", 1227 * so write it, then write received data */ 1228 if (out_cnt) { 1229 full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1); 1230 full_write(STDOUT_FILENO, rbuf, out_cnt); 1231 } 1232 break; /* CGI stdout is closed, exiting */ 1233 } 1234 out_cnt += count; 1235 count = 0; 1236 /* "Status" header format is: "Status: 302 Redirected\r\n" */ 1237 if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) { 1238 /* send "HTTP/1.0 " */ 1239 if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9) 1240 break; 1241 rbuf += 8; /* skip "Status: " */ 1242 count = out_cnt - 8; 1243 out_cnt = -1; /* buffering off */ 1244 } else if (out_cnt >= 4) { 1245 /* Did CGI add "HTTP"? */ 1246 if (memcmp(rbuf, HTTP_200, 4) != 0) { 1247 /* there is no "HTTP", do it ourself */ 1248 if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1) 1249 break; 1250 } 1251 /* Commented out: 1252 if (!strstr(rbuf, "ontent-")) { 1253 full_write(s, "Content-type: text/plain\r\n\r\n", 28); 1254 } 1255 * Counter-example of valid CGI without Content-type: 1256 * echo -en "HTTP/1.0 302 Found\r\n" 1257 * echo -en "Location: http://www.busybox.net\r\n" 1258 * echo -en "\r\n" 1259 */ 1260 count = out_cnt; 1261 out_cnt = -1; /* buffering off */ 1262 } 1263 } else { 1264 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF); 1265 if (count <= 0) 1266 break; /* eof (or error) */ 1267 } 1268 if (full_write(STDOUT_FILENO, rbuf, count) != count) 1269 break; 1270 if (DEBUG) 1271 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf); 1272 } /* if (pfd[FROM_CGI].revents) */ 1273 } /* while (1) */ 1274 log_and_exit(); 1275} 1276#endif 1277 1278#if ENABLE_FEATURE_HTTPD_CGI 1279 1280static void setenv1(const char *name, const char *value) 1281{ 1282 setenv(name, value ? value : "", 1); 1283} 1284 1285/* 1286 * Spawn CGI script, forward CGI's stdin/out <=> network 1287 * 1288 * Environment variables are set up and the script is invoked with pipes 1289 * for stdin/stdout. If a POST is being done the script is fed the POST 1290 * data in addition to setting the QUERY_STRING variable (for GETs or POSTs). 1291 * 1292 * Parameters: 1293 * const char *url The requested URL (with leading /). 1294 * int post_len Length of the POST body. 1295 * const char *cookie For set HTTP_COOKIE. 1296 * const char *content_type For set CONTENT_TYPE. 1297 */ 1298static void send_cgi_and_exit( 1299 const char *url, 1300 const char *request, 1301 int post_len, 1302 const char *cookie, 1303 const char *content_type) NORETURN; 1304static void send_cgi_and_exit( 1305 const char *url, 1306 const char *request, 1307 int post_len, 1308 const char *cookie, 1309 const char *content_type) 1310{ 1311 struct fd_pair fromCgi; /* CGI -> httpd pipe */ 1312 struct fd_pair toCgi; /* httpd -> CGI pipe */ 1313 char *script; 1314 int pid; 1315 1316 /* Make a copy. NB: caller guarantees: 1317 * url[0] == '/', url[1] != '/' */ 1318 url = xstrdup(url); 1319 1320 /* 1321 * We are mucking with environment _first_ and then vfork/exec, 1322 * this allows us to use vfork safely. Parent doesn't care about 1323 * these environment changes anyway. 1324 */ 1325 1326 /* Check for [dirs/]script.cgi/PATH_INFO */ 1327 script = (char*)url; 1328 while ((script = strchr(script + 1, '/')) != NULL) { 1329 *script = '\0'; 1330 if (!is_directory(url + 1, 1, NULL)) { 1331 /* not directory, found script.cgi/PATH_INFO */ 1332 *script = '/'; 1333 break; 1334 } 1335 *script = '/'; /* is directory, find next '/' */ 1336 } 1337 setenv1("PATH_INFO", script); /* set to /PATH_INFO or "" */ 1338 setenv1("REQUEST_METHOD", request); 1339 if (g_query) { 1340 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", url, g_query)); 1341 } else { 1342 setenv1("REQUEST_URI", url); 1343 } 1344 if (script != NULL) 1345 *script = '\0'; /* cut off /PATH_INFO */ 1346 1347 /* SCRIPT_FILENAME is required by PHP in CGI mode */ 1348 if (home_httpd[0] == '/') { 1349 char *fullpath = concat_path_file(home_httpd, url); 1350 setenv1("SCRIPT_FILENAME", fullpath); 1351 } 1352 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */ 1353 setenv1("SCRIPT_NAME", url); 1354 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html: 1355 * QUERY_STRING: The information which follows the ? in the URL 1356 * which referenced this script. This is the query information. 1357 * It should not be decoded in any fashion. This variable 1358 * should always be set when there is query information, 1359 * regardless of command line decoding. */ 1360 /* (Older versions of bbox seem to do some decoding) */ 1361 setenv1("QUERY_STRING", g_query); 1362 putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER); 1363 putenv((char*)"SERVER_PROTOCOL=HTTP/1.0"); 1364 putenv((char*)"GATEWAY_INTERFACE=CGI/1.1"); 1365 /* Having _separate_ variables for IP and port defeats 1366 * the purpose of having socket abstraction. Which "port" 1367 * are you using on Unix domain socket? 1368 * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense. 1369 * Oh well... */ 1370 { 1371 char *p = rmt_ip_str ? rmt_ip_str : (char*)""; 1372 char *cp = strrchr(p, ':'); 1373 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']')) 1374 cp = NULL; 1375 if (cp) *cp = '\0'; /* delete :PORT */ 1376 setenv1("REMOTE_ADDR", p); 1377 if (cp) { 1378 *cp = ':'; 1379#if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV 1380 setenv1("REMOTE_PORT", cp + 1); 1381#endif 1382 } 1383 } 1384 setenv1("HTTP_USER_AGENT", user_agent); 1385 if (http_accept) 1386 setenv1("HTTP_ACCEPT", http_accept); 1387 if (http_accept_language) 1388 setenv1("HTTP_ACCEPT_LANGUAGE", http_accept_language); 1389 if (post_len) 1390 putenv(xasprintf("CONTENT_LENGTH=%d", post_len)); 1391 if (cookie) 1392 setenv1("HTTP_COOKIE", cookie); 1393 if (content_type) 1394 setenv1("CONTENT_TYPE", content_type); 1395#if ENABLE_FEATURE_HTTPD_BASIC_AUTH 1396 if (remoteuser) { 1397 setenv1("REMOTE_USER", remoteuser); 1398 putenv((char*)"AUTH_TYPE=Basic"); 1399 } 1400#endif 1401 if (referer) 1402 setenv1("HTTP_REFERER", referer); 1403 setenv1("HTTP_HOST", host); /* set to "" if NULL */ 1404 /* setenv1("SERVER_NAME", safe_gethostname()); - don't do this, 1405 * just run "env SERVER_NAME=xyz httpd ..." instead */ 1406 1407 xpiped_pair(fromCgi); 1408 xpiped_pair(toCgi); 1409 1410 pid = vfork(); 1411 if (pid < 0) { 1412 /* TODO: log perror? */ 1413 log_and_exit(); 1414 } 1415 1416 if (!pid) { 1417 /* Child process */ 1418 char *argv[3]; 1419 1420 xfunc_error_retval = 242; 1421 1422 /* NB: close _first_, then move fds! */ 1423 close(toCgi.wr); 1424 close(fromCgi.rd); 1425 xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */ 1426 xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */ 1427 /* User seeing stderr output can be a security problem. 1428 * If CGI really wants that, it can always do dup itself. */ 1429 /* dup2(1, 2); */ 1430 1431 /* Chdiring to script's dir */ 1432 script = strrchr(url, '/'); 1433 if (script != url) { /* paranoia */ 1434 *script = '\0'; 1435 if (chdir(url + 1) != 0) { 1436 bb_perror_msg("chdir(%s)", url + 1); 1437 goto error_execing_cgi; 1438 } 1439 // not needed: *script = '/'; 1440 } 1441 script++; 1442 1443 /* set argv[0] to name without path */ 1444 argv[0] = script; 1445 argv[1] = NULL; 1446 1447#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR 1448 { 1449 char *suffix = strrchr(script, '.'); 1450 1451 if (suffix) { 1452 Htaccess *cur; 1453 for (cur = script_i; cur; cur = cur->next) { 1454 if (strcmp(cur->before_colon + 1, suffix) == 0) { 1455 /* found interpreter name */ 1456 argv[0] = cur->after_colon; 1457 argv[1] = script; 1458 argv[2] = NULL; 1459 break; 1460 } 1461 } 1462 } 1463 } 1464#endif 1465 /* restore default signal dispositions for CGI process */ 1466 bb_signals(0 1467 | (1 << SIGCHLD) 1468 | (1 << SIGPIPE) 1469 | (1 << SIGHUP) 1470 , SIG_DFL); 1471 1472 /* _NOT_ execvp. We do not search PATH. argv[0] is a filename 1473 * without any dir components and will only match a file 1474 * in the current directory */ 1475 execv(argv[0], argv); 1476 if (verbose) 1477 bb_perror_msg("can't execute '%s'", argv[0]); 1478 error_execing_cgi: 1479 /* send to stdout 1480 * (we are CGI here, our stdout is pumped to the net) */ 1481 send_headers_and_exit(HTTP_NOT_FOUND); 1482 } /* end child */ 1483 1484 /* Parent process */ 1485 1486 /* Restore variables possibly changed by child */ 1487 xfunc_error_retval = 0; 1488 1489 /* Pump data */ 1490 close(fromCgi.wr); 1491 close(toCgi.rd); 1492 cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len); 1493} 1494 1495#endif /* FEATURE_HTTPD_CGI */ 1496 1497/* 1498 * Send a file response to a HTTP request, and exit 1499 * 1500 * Parameters: 1501 * const char *url The requested URL (with leading /). 1502 * what What to send (headers/body/both). 1503 */ 1504static NOINLINE void send_file_and_exit(const char *url, int what) 1505{ 1506 char *suffix; 1507 int fd; 1508 ssize_t count; 1509 1510 fd = open(url, O_RDONLY); 1511 if (fd < 0) { 1512 if (DEBUG) 1513 bb_perror_msg("can't open '%s'", url); 1514 /* Error pages are sent by using send_file_and_exit(SEND_BODY). 1515 * IOW: it is unsafe to call send_headers_and_exit 1516 * if what is SEND_BODY! Can recurse! */ 1517 if (what != SEND_BODY) 1518 send_headers_and_exit(HTTP_NOT_FOUND); 1519 log_and_exit(); 1520 } 1521 /* If you want to know about EPIPE below 1522 * (happens if you abort downloads from local httpd): */ 1523 signal(SIGPIPE, SIG_IGN); 1524 1525 /* If not found, default is "application/octet-stream" */ 1526 found_mime_type = "application/octet-stream"; 1527 suffix = strrchr(url, '.'); 1528 if (suffix) { 1529 static const char suffixTable[] ALIGN1 = 1530 /* Shorter suffix must be first: 1531 * ".html.htm" will fail for ".htm" 1532 */ 1533 ".txt.h.c.cc.cpp\0" "text/plain\0" 1534 /* .htm line must be after .h line */ 1535 ".htm.html\0" "text/html\0" 1536 ".jpg.jpeg\0" "image/jpeg\0" 1537 ".gif\0" "image/gif\0" 1538 ".png\0" "image/png\0" 1539 /* .css line must be after .c line */ 1540 ".css\0" "text/css\0" 1541 ".wav\0" "audio/wav\0" 1542 ".avi\0" "video/x-msvideo\0" 1543 ".qt.mov\0" "video/quicktime\0" 1544 ".mpe.mpeg\0" "video/mpeg\0" 1545 ".mid.midi\0" "audio/midi\0" 1546 ".mp3\0" "audio/mpeg\0" 1547#if 0 /* unpopular */ 1548 ".au\0" "audio/basic\0" 1549 ".pac\0" "application/x-ns-proxy-autoconfig\0" 1550 ".vrml.wrl\0" "model/vrml\0" 1551#endif 1552 /* compiler adds another "\0" here */ 1553 ; 1554 Htaccess *cur; 1555 1556 /* Examine built-in table */ 1557 const char *table = suffixTable; 1558 const char *table_next; 1559 for (; *table; table = table_next) { 1560 const char *try_suffix; 1561 const char *mime_type; 1562 mime_type = table + strlen(table) + 1; 1563 table_next = mime_type + strlen(mime_type) + 1; 1564 try_suffix = strstr(table, suffix); 1565 if (!try_suffix) 1566 continue; 1567 try_suffix += strlen(suffix); 1568 if (*try_suffix == '\0' || *try_suffix == '.') { 1569 found_mime_type = mime_type; 1570 break; 1571 } 1572 /* Example: strstr(table, ".av") != NULL, but it 1573 * does not match ".avi" after all and we end up here. 1574 * The table is arranged so that in this case we know 1575 * that it can't match anything in the following lines, 1576 * and we stop the search: */ 1577 break; 1578 } 1579 /* ...then user's table */ 1580 for (cur = mime_a; cur; cur = cur->next) { 1581 if (strcmp(cur->before_colon, suffix) == 0) { 1582 found_mime_type = cur->after_colon; 1583 break; 1584 } 1585 } 1586 } 1587 1588 if (DEBUG) 1589 bb_error_msg("sending file '%s' content-type: %s", 1590 url, found_mime_type); 1591 1592#if ENABLE_FEATURE_HTTPD_RANGES 1593 if (what == SEND_BODY) 1594 range_start = 0; /* err pages and ranges don't mix */ 1595 range_len = MAXINT(off_t); 1596 if (range_start) { 1597 if (!range_end) { 1598 range_end = file_size - 1; 1599 } 1600 if (range_end < range_start 1601 || lseek(fd, range_start, SEEK_SET) != range_start 1602 ) { 1603 lseek(fd, 0, SEEK_SET); 1604 range_start = 0; 1605 } else { 1606 range_len = range_end - range_start + 1; 1607 send_headers(HTTP_PARTIAL_CONTENT); 1608 what = SEND_BODY; 1609 } 1610 } 1611#endif 1612 if (what & SEND_HEADERS) 1613 send_headers(HTTP_OK); 1614#if ENABLE_FEATURE_HTTPD_USE_SENDFILE 1615 { 1616 off_t offset = range_start; 1617 while (1) { 1618 /* sz is rounded down to 64k */ 1619 ssize_t sz = MAXINT(ssize_t) - 0xffff; 1620 IF_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;) 1621 count = sendfile(STDOUT_FILENO, fd, &offset, sz); 1622 if (count < 0) { 1623 if (offset == range_start) 1624 break; /* fall back to read/write loop */ 1625 goto fin; 1626 } 1627 IF_FEATURE_HTTPD_RANGES(range_len -= sz;) 1628 if (count == 0 || range_len == 0) 1629 log_and_exit(); 1630 } 1631 } 1632#endif 1633 while ((count = safe_read(fd, iobuf, IOBUF_SIZE)) > 0) { 1634 ssize_t n; 1635 IF_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;) 1636 n = full_write(STDOUT_FILENO, iobuf, count); 1637 if (count != n) 1638 break; 1639 IF_FEATURE_HTTPD_RANGES(range_len -= count;) 1640 if (range_len == 0) 1641 break; 1642 } 1643 if (count < 0) { 1644 IF_FEATURE_HTTPD_USE_SENDFILE(fin:) 1645 if (verbose > 1) 1646 bb_perror_msg("error"); 1647 } 1648 log_and_exit(); 1649} 1650 1651static int checkPermIP(void) 1652{ 1653 Htaccess_IP *cur; 1654 1655 for (cur = ip_a_d; cur; cur = cur->next) { 1656#if DEBUG 1657 fprintf(stderr, 1658 "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n", 1659 rmt_ip_str, 1660 (unsigned char)(cur->ip >> 24), 1661 (unsigned char)(cur->ip >> 16), 1662 (unsigned char)(cur->ip >> 8), 1663 (unsigned char)(cur->ip), 1664 (unsigned char)(cur->mask >> 24), 1665 (unsigned char)(cur->mask >> 16), 1666 (unsigned char)(cur->mask >> 8), 1667 (unsigned char)(cur->mask) 1668 ); 1669#endif 1670 if ((rmt_ip & cur->mask) == cur->ip) 1671 return (cur->allow_deny == 'A'); /* A -> 1 */ 1672 } 1673 1674 return !flg_deny_all; /* depends on whether we saw "D:*" */ 1675} 1676 1677#if ENABLE_FEATURE_HTTPD_BASIC_AUTH 1678/* 1679 * Config file entries are of the form "/<path>:<user>:<passwd>". 1680 * If config file has no prefix match for path, access is allowed. 1681 * 1682 * path The file path 1683 * user_and_passwd "user:passwd" to validate 1684 * 1685 * Returns 1 if user_and_passwd is OK. 1686 */ 1687static int check_user_passwd(const char *path, const char *user_and_passwd) 1688{ 1689 Htaccess *cur; 1690 const char *prev = NULL; 1691 1692 for (cur = g_auth; cur; cur = cur->next) { 1693 const char *dir_prefix; 1694 size_t len; 1695 1696 dir_prefix = cur->before_colon; 1697 1698 /* WHY? */ 1699 /* If already saw a match, don't accept other different matches */ 1700 if (prev && strcmp(prev, dir_prefix) != 0) 1701 continue; 1702 1703 if (DEBUG) 1704 fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd); 1705 1706 /* If it's not a prefix match, continue searching */ 1707 len = strlen(dir_prefix); 1708 if (len != 1 /* dir_prefix "/" matches all, don't need to check */ 1709 && (strncmp(dir_prefix, path, len) != 0 1710 || (path[len] != '/' && path[len] != '\0')) 1711 ) { 1712 continue; 1713 } 1714 1715 /* Path match found */ 1716 prev = dir_prefix; 1717 1718 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) { 1719 char *md5_passwd; 1720 1721 md5_passwd = strchr(cur->after_colon, ':'); 1722 if (md5_passwd && md5_passwd[1] == '$' && md5_passwd[2] == '1' 1723 && md5_passwd[3] == '$' && md5_passwd[4] 1724 ) { 1725 char *encrypted; 1726 int r, user_len_p1; 1727 1728 md5_passwd++; 1729 user_len_p1 = md5_passwd - cur->after_colon; 1730 /* comparing "user:" */ 1731 if (strncmp(cur->after_colon, user_and_passwd, user_len_p1) != 0) { 1732 continue; 1733 } 1734 1735 encrypted = pw_encrypt( 1736 user_and_passwd + user_len_p1 /* cleartext pwd from user */, 1737 md5_passwd /*salt */, 1 /* cleanup */); 1738 r = strcmp(encrypted, md5_passwd); 1739 free(encrypted); 1740 if (r == 0) 1741 goto set_remoteuser_var; /* Ok */ 1742 continue; 1743 } 1744 } 1745 1746 /* Comparing plaintext "user:pass" in one go */ 1747 if (strcmp(cur->after_colon, user_and_passwd) == 0) { 1748 set_remoteuser_var: 1749 remoteuser = xstrndup(user_and_passwd, 1750 strchrnul(user_and_passwd, ':') - user_and_passwd); 1751 return 1; /* Ok */ 1752 } 1753 } /* for */ 1754 1755 /* 0(bad) if prev is set: matches were found but passwd was wrong */ 1756 return (prev == NULL); 1757} 1758#endif /* FEATURE_HTTPD_BASIC_AUTH */ 1759 1760#if ENABLE_FEATURE_HTTPD_PROXY 1761static Htaccess_Proxy *find_proxy_entry(const char *url) 1762{ 1763 Htaccess_Proxy *p; 1764 for (p = proxy; p; p = p->next) { 1765 if (strncmp(url, p->url_from, strlen(p->url_from)) == 0) 1766 return p; 1767 } 1768 return NULL; 1769} 1770#endif 1771 1772/* 1773 * Handle timeouts 1774 */ 1775static void send_REQUEST_TIMEOUT_and_exit(int sig) NORETURN; 1776static void send_REQUEST_TIMEOUT_and_exit(int sig UNUSED_PARAM) 1777{ 1778 send_headers_and_exit(HTTP_REQUEST_TIMEOUT); 1779} 1780 1781/* 1782 * Handle an incoming http request and exit. 1783 */ 1784static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN; 1785static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) 1786{ 1787 static const char request_GET[] ALIGN1 = "GET"; 1788 struct stat sb; 1789 char *urlcopy; 1790 char *urlp; 1791 char *tptr; 1792#if ENABLE_FEATURE_HTTPD_CGI 1793 static const char request_HEAD[] ALIGN1 = "HEAD"; 1794 const char *prequest; 1795 char *cookie = NULL; 1796 char *content_type = NULL; 1797 unsigned long length = 0; 1798#elif ENABLE_FEATURE_HTTPD_PROXY 1799#define prequest request_GET 1800 unsigned long length = 0; 1801#endif 1802#if ENABLE_FEATURE_HTTPD_BASIC_AUTH 1803 smallint authorized = -1; 1804#endif 1805 smallint ip_allowed; 1806 char http_major_version; 1807#if ENABLE_FEATURE_HTTPD_PROXY 1808 char http_minor_version; 1809 char *header_buf = header_buf; /* for gcc */ 1810 char *header_ptr = header_ptr; 1811 Htaccess_Proxy *proxy_entry; 1812#endif 1813 1814 /* Allocation of iobuf is postponed until now 1815 * (IOW, server process doesn't need to waste 8k) */ 1816 iobuf = xmalloc(IOBUF_SIZE); 1817 1818 rmt_ip = 0; 1819 if (fromAddr->u.sa.sa_family == AF_INET) { 1820 rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr); 1821 } 1822#if ENABLE_FEATURE_IPV6 1823 if (fromAddr->u.sa.sa_family == AF_INET6 1824 && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0 1825 && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0 1826 && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff) 1827 rmt_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]); 1828#endif 1829 if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) { 1830 /* NB: can be NULL (user runs httpd -i by hand?) */ 1831 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa); 1832 } 1833 if (verbose) { 1834 /* this trick makes -v logging much simpler */ 1835 if (rmt_ip_str) 1836 applet_name = rmt_ip_str; 1837 if (verbose > 2) 1838 bb_error_msg("connected"); 1839 } 1840 1841 /* Install timeout handler. get_line() needs it. */ 1842 signal(SIGALRM, send_REQUEST_TIMEOUT_and_exit); 1843 1844 if (!get_line()) /* EOF or error or empty line */ 1845 send_headers_and_exit(HTTP_BAD_REQUEST); 1846 1847 /* Determine type of request (GET/POST) */ 1848 urlp = strpbrk(iobuf, " \t"); 1849 if (urlp == NULL) 1850 send_headers_and_exit(HTTP_BAD_REQUEST); 1851 *urlp++ = '\0'; 1852#if ENABLE_FEATURE_HTTPD_CGI 1853 prequest = request_GET; 1854 if (strcasecmp(iobuf, prequest) != 0) { 1855 prequest = request_HEAD; 1856 if (strcasecmp(iobuf, prequest) != 0) { 1857 prequest = "POST"; 1858 if (strcasecmp(iobuf, prequest) != 0) 1859 send_headers_and_exit(HTTP_NOT_IMPLEMENTED); 1860 } 1861 } 1862#else 1863 if (strcasecmp(iobuf, request_GET) != 0) 1864 send_headers_and_exit(HTTP_NOT_IMPLEMENTED); 1865#endif 1866 urlp = skip_whitespace(urlp); 1867 if (urlp[0] != '/') 1868 send_headers_and_exit(HTTP_BAD_REQUEST); 1869 1870 /* Find end of URL and parse HTTP version, if any */ 1871 http_major_version = '0'; 1872 IF_FEATURE_HTTPD_PROXY(http_minor_version = '0';) 1873 tptr = strchrnul(urlp, ' '); 1874 /* Is it " HTTP/"? */ 1875 if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) { 1876 http_major_version = tptr[6]; 1877 IF_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];) 1878 } 1879 *tptr = '\0'; 1880 1881 /* Copy URL from after "GET "/"POST " to stack-allocated char[] */ 1882 urlcopy = alloca((tptr - urlp) + 2 + strlen(index_page)); 1883 /*if (urlcopy == NULL) 1884 * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/ 1885 strcpy(urlcopy, urlp); 1886 /* NB: urlcopy ptr is never changed after this */ 1887 1888 /* Extract url args if present */ 1889 g_query = NULL; 1890 tptr = strchr(urlcopy, '?'); 1891 if (tptr) { 1892 *tptr++ = '\0'; 1893 g_query = tptr; 1894 } 1895 1896 /* Decode URL escape sequences */ 1897 tptr = decodeString(urlcopy, 0); 1898 if (tptr == NULL) 1899 send_headers_and_exit(HTTP_BAD_REQUEST); 1900 if (tptr == urlcopy + 1) { 1901 /* '/' or NUL is encoded */ 1902 send_headers_and_exit(HTTP_NOT_FOUND); 1903 } 1904 1905 /* Canonicalize path */ 1906 /* Algorithm stolen from libbb bb_simplify_path(), 1907 * but don't strdup, retain trailing slash, protect root */ 1908 urlp = tptr = urlcopy; 1909 do { 1910 if (*urlp == '/') { 1911 /* skip duplicate (or initial) slash */ 1912 if (*tptr == '/') { 1913 continue; 1914 } 1915 if (*tptr == '.') { 1916 /* skip extra "/./" */ 1917 if (tptr[1] == '/' || !tptr[1]) { 1918 continue; 1919 } 1920 /* "..": be careful */ 1921 if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) { 1922 ++tptr; 1923 if (urlp == urlcopy) /* protect root */ 1924 send_headers_and_exit(HTTP_BAD_REQUEST); 1925 while (*--urlp != '/') /* omit previous dir */; 1926 continue; 1927 } 1928 } 1929 } 1930 *++urlp = *tptr; 1931 } while (*++tptr); 1932 *++urlp = '\0'; /* terminate after last character */ 1933 1934 /* If URL is a directory, add '/' */ 1935 if (urlp[-1] != '/') { 1936 if (is_directory(urlcopy + 1, 1, NULL)) { 1937 found_moved_temporarily = urlcopy; 1938 } 1939 } 1940 1941 /* Log it */ 1942 if (verbose > 1) 1943 bb_error_msg("url:%s", urlcopy); 1944 1945 tptr = urlcopy; 1946 ip_allowed = checkPermIP(); 1947 while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) { 1948 /* have path1/path2 */ 1949 *tptr = '\0'; 1950 if (is_directory(urlcopy + 1, 1, NULL)) { 1951 /* may have subdir config */ 1952 parse_conf(urlcopy + 1, SUBDIR_PARSE); 1953 ip_allowed = checkPermIP(); 1954 } 1955 *tptr = '/'; 1956 } 1957 1958#if ENABLE_FEATURE_HTTPD_PROXY 1959 proxy_entry = find_proxy_entry(urlcopy); 1960 if (proxy_entry) 1961 header_buf = header_ptr = xmalloc(IOBUF_SIZE); 1962#endif 1963 1964 if (http_major_version >= '0') { 1965 /* Request was with "... HTTP/nXXX", and n >= 0 */ 1966 1967 /* Read until blank line for HTTP version specified, else parse immediate */ 1968 while (1) { 1969 if (!get_line()) 1970 break; /* EOF or error or empty line */ 1971 if (DEBUG) 1972 bb_error_msg("header: '%s'", iobuf); 1973 1974#if ENABLE_FEATURE_HTTPD_PROXY 1975 /* We need 2 more bytes for yet another "\r\n" - 1976 * see near fdprintf(proxy_fd...) further below */ 1977 if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) { 1978 int len = strlen(iobuf); 1979 if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4) 1980 len = IOBUF_SIZE - (header_ptr - header_buf) - 4; 1981 memcpy(header_ptr, iobuf, len); 1982 header_ptr += len; 1983 header_ptr[0] = '\r'; 1984 header_ptr[1] = '\n'; 1985 header_ptr += 2; 1986 } 1987#endif 1988 1989#if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY 1990 /* Try and do our best to parse more lines */ 1991 if ((STRNCASECMP(iobuf, "Content-length:") == 0)) { 1992 /* extra read only for POST */ 1993 if (prequest != request_GET 1994#if ENABLE_FEATURE_HTTPD_CGI 1995 && prequest != request_HEAD 1996#endif 1997 ) { 1998 tptr = skip_whitespace(iobuf + sizeof("Content-length:") - 1); 1999 if (!tptr[0]) 2000 send_headers_and_exit(HTTP_BAD_REQUEST); 2001 /* not using strtoul: it ignores leading minus! */ 2002 length = bb_strtou(tptr, NULL, 10); 2003 /* length is "ulong", but we need to pass it to int later */ 2004 if (errno || length > INT_MAX) 2005 send_headers_and_exit(HTTP_BAD_REQUEST); 2006 } 2007 } 2008#endif 2009#if ENABLE_FEATURE_HTTPD_CGI 2010 else if (STRNCASECMP(iobuf, "Cookie:") == 0) { 2011 cookie = xstrdup(skip_whitespace(iobuf + sizeof("Cookie:")-1)); 2012 } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) { 2013 content_type = xstrdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1)); 2014 } else if (STRNCASECMP(iobuf, "Referer:") == 0) { 2015 referer = xstrdup(skip_whitespace(iobuf + sizeof("Referer:")-1)); 2016 } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) { 2017 user_agent = xstrdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1)); 2018 } else if (STRNCASECMP(iobuf, "Host:") == 0) { 2019 host = xstrdup(skip_whitespace(iobuf + sizeof("Host:")-1)); 2020 } else if (STRNCASECMP(iobuf, "Accept:") == 0) { 2021 http_accept = xstrdup(skip_whitespace(iobuf + sizeof("Accept:")-1)); 2022 } else if (STRNCASECMP(iobuf, "Accept-Language:") == 0) { 2023 http_accept_language = xstrdup(skip_whitespace(iobuf + sizeof("Accept-Language:")-1)); 2024 } 2025#endif 2026#if ENABLE_FEATURE_HTTPD_BASIC_AUTH 2027 if (STRNCASECMP(iobuf, "Authorization:") == 0) { 2028 /* We only allow Basic credentials. 2029 * It shows up as "Authorization: Basic <user>:<passwd>" where 2030 * "<user>:<passwd>" is base64 encoded. 2031 */ 2032 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1); 2033 if (STRNCASECMP(tptr, "Basic") != 0) 2034 continue; 2035 tptr += sizeof("Basic")-1; 2036 /* decodeBase64() skips whitespace itself */ 2037 decodeBase64(tptr); 2038 authorized = check_user_passwd(urlcopy, tptr); 2039 } 2040#endif 2041#if ENABLE_FEATURE_HTTPD_RANGES 2042 if (STRNCASECMP(iobuf, "Range:") == 0) { 2043 /* We know only bytes=NNN-[MMM] */ 2044 char *s = skip_whitespace(iobuf + sizeof("Range:")-1); 2045 if (strncmp(s, "bytes=", 6) == 0) { 2046 s += sizeof("bytes=")-1; 2047 range_start = BB_STRTOOFF(s, &s, 10); 2048 if (s[0] != '-' || range_start < 0) { 2049 range_start = 0; 2050 } else if (s[1]) { 2051 range_end = BB_STRTOOFF(s+1, NULL, 10); 2052 if (errno || range_end < range_start) 2053 range_start = 0; 2054 } 2055 } 2056 } 2057#endif 2058 } /* while extra header reading */ 2059 } 2060 2061 /* We are done reading headers, disable peer timeout */ 2062 alarm(0); 2063 2064 if (strcmp(bb_basename(urlcopy), HTTPD_CONF) == 0 || !ip_allowed) { 2065 /* protect listing [/path]/httpd.conf or IP deny */ 2066 send_headers_and_exit(HTTP_FORBIDDEN); 2067 } 2068 2069#if ENABLE_FEATURE_HTTPD_BASIC_AUTH 2070 /* Case: no "Authorization:" was seen, but page does require passwd. 2071 * Check that with dummy user:pass */ 2072 if (authorized < 0) 2073 authorized = check_user_passwd(urlcopy, ":"); 2074 if (!authorized) 2075 send_headers_and_exit(HTTP_UNAUTHORIZED); 2076#endif 2077 2078 if (found_moved_temporarily) { 2079 send_headers_and_exit(HTTP_MOVED_TEMPORARILY); 2080 } 2081 2082#if ENABLE_FEATURE_HTTPD_PROXY 2083 if (proxy_entry != NULL) { 2084 int proxy_fd; 2085 len_and_sockaddr *lsa; 2086 2087 proxy_fd = socket(AF_INET, SOCK_STREAM, 0); 2088 if (proxy_fd < 0) 2089 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); 2090 lsa = host2sockaddr(proxy_entry->host_port, 80); 2091 if (lsa == NULL) 2092 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); 2093 if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0) 2094 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); 2095 fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n", 2096 prequest, /* GET or POST */ 2097 proxy_entry->url_to, /* url part 1 */ 2098 urlcopy + strlen(proxy_entry->url_from), /* url part 2 */ 2099 (g_query ? "?" : ""), /* "?" (maybe) */ 2100 (g_query ? g_query : ""), /* query string (maybe) */ 2101 http_major_version, http_minor_version); 2102 header_ptr[0] = '\r'; 2103 header_ptr[1] = '\n'; 2104 header_ptr += 2; 2105 write(proxy_fd, header_buf, header_ptr - header_buf); 2106 free(header_buf); /* on the order of 8k, free it */ 2107 cgi_io_loop_and_exit(proxy_fd, proxy_fd, length); 2108 } 2109#endif 2110 2111 tptr = urlcopy + 1; /* skip first '/' */ 2112 2113#if ENABLE_FEATURE_HTTPD_CGI 2114 if (strncmp(tptr, "cgi-bin/", 8) == 0) { 2115 if (tptr[8] == '\0') { 2116 /* protect listing "cgi-bin/" */ 2117 send_headers_and_exit(HTTP_FORBIDDEN); 2118 } 2119 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type); 2120 } 2121#endif 2122 2123 if (urlp[-1] == '/') 2124 strcpy(urlp, index_page); 2125 if (stat(tptr, &sb) == 0) { 2126#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR 2127 char *suffix = strrchr(tptr, '.'); 2128 if (suffix) { 2129 Htaccess *cur; 2130 for (cur = script_i; cur; cur = cur->next) { 2131 if (strcmp(cur->before_colon + 1, suffix) == 0) { 2132 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type); 2133 } 2134 } 2135 } 2136#endif 2137 file_size = sb.st_size; 2138 last_mod = sb.st_mtime; 2139 } 2140#if ENABLE_FEATURE_HTTPD_CGI 2141 else if (urlp[-1] == '/') { 2142 /* It's a dir URL and there is no index.html 2143 * Try cgi-bin/index.cgi */ 2144 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) { 2145 urlp[0] = '\0'; 2146 g_query = urlcopy; 2147 send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type); 2148 } 2149 } 2150 /* else fall through to send_file, it errors out if open fails: */ 2151 2152 if (prequest != request_GET && prequest != request_HEAD) { 2153 /* POST for files does not make sense */ 2154 send_headers_and_exit(HTTP_NOT_IMPLEMENTED); 2155 } 2156 send_file_and_exit(tptr, 2157 (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS) 2158 ); 2159#else 2160 send_file_and_exit(tptr, SEND_HEADERS_AND_BODY); 2161#endif 2162} 2163 2164/* 2165 * The main http server function. 2166 * Given a socket, listen for new connections and farm out 2167 * the processing as a [v]forked process. 2168 * Never returns. 2169 */ 2170#if BB_MMU 2171static void mini_httpd(int server_socket) NORETURN; 2172static void mini_httpd(int server_socket) 2173{ 2174 /* NB: it's best to not use xfuncs in this loop before fork(). 2175 * Otherwise server may die on transient errors (temporary 2176 * out-of-memory condition, etc), which is Bad(tm). 2177 * Try to do any dangerous calls after fork. 2178 */ 2179 while (1) { 2180 int n; 2181 len_and_sockaddr fromAddr; 2182 2183 /* Wait for connections... */ 2184 fromAddr.len = LSA_SIZEOF_SA; 2185 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len); 2186 2187 if (n < 0) 2188 continue; 2189 /* set the KEEPALIVE option to cull dead connections */ 2190 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1)); 2191 2192 if (fork() == 0) { 2193 /* child */ 2194 /* Do not reload config on HUP */ 2195 signal(SIGHUP, SIG_IGN); 2196 close(server_socket); 2197 xmove_fd(n, 0); 2198 xdup2(0, 1); 2199 2200 handle_incoming_and_exit(&fromAddr); 2201 } 2202 /* parent, or fork failed */ 2203 close(n); 2204 } /* while (1) */ 2205 /* never reached */ 2206} 2207#else 2208static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN; 2209static void mini_httpd_nommu(int server_socket, int argc, char **argv) 2210{ 2211 char *argv_copy[argc + 2]; 2212 2213 argv_copy[0] = argv[0]; 2214 argv_copy[1] = (char*)"-i"; 2215 memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0])); 2216 2217 /* NB: it's best to not use xfuncs in this loop before vfork(). 2218 * Otherwise server may die on transient errors (temporary 2219 * out-of-memory condition, etc), which is Bad(tm). 2220 * Try to do any dangerous calls after fork. 2221 */ 2222 while (1) { 2223 int n; 2224 len_and_sockaddr fromAddr; 2225 2226 /* Wait for connections... */ 2227 fromAddr.len = LSA_SIZEOF_SA; 2228 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len); 2229 2230 if (n < 0) 2231 continue; 2232 /* set the KEEPALIVE option to cull dead connections */ 2233 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1)); 2234 2235 if (vfork() == 0) { 2236 /* child */ 2237 /* Do not reload config on HUP */ 2238 signal(SIGHUP, SIG_IGN); 2239 close(server_socket); 2240 xmove_fd(n, 0); 2241 xdup2(0, 1); 2242 2243 /* Run a copy of ourself in inetd mode */ 2244 re_exec(argv_copy); 2245 } 2246 /* parent, or vfork failed */ 2247 close(n); 2248 } /* while (1) */ 2249 /* never reached */ 2250} 2251#endif 2252 2253/* 2254 * Process a HTTP connection on stdin/out. 2255 * Never returns. 2256 */ 2257static void mini_httpd_inetd(void) NORETURN; 2258static void mini_httpd_inetd(void) 2259{ 2260 len_and_sockaddr fromAddr; 2261 2262 memset(&fromAddr, 0, sizeof(fromAddr)); 2263 fromAddr.len = LSA_SIZEOF_SA; 2264 /* NB: can fail if user runs it by hand and types in http cmds */ 2265 getpeername(0, &fromAddr.u.sa, &fromAddr.len); 2266 handle_incoming_and_exit(&fromAddr); 2267} 2268 2269static void sighup_handler(int sig UNUSED_PARAM) 2270{ 2271 parse_conf(DEFAULT_PATH_HTTPD_CONF, SIGNALED_PARSE); 2272} 2273 2274enum { 2275 c_opt_config_file = 0, 2276 d_opt_decode_url, 2277 h_opt_home_httpd, 2278 IF_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,) 2279 IF_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,) 2280 IF_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,) 2281 IF_FEATURE_HTTPD_SETUID( u_opt_setuid ,) 2282 p_opt_port , 2283 p_opt_inetd , 2284 p_opt_foreground, 2285 p_opt_verbose , 2286 OPT_CONFIG_FILE = 1 << c_opt_config_file, 2287 OPT_DECODE_URL = 1 << d_opt_decode_url, 2288 OPT_HOME_HTTPD = 1 << h_opt_home_httpd, 2289 OPT_ENCODE_URL = IF_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0, 2290 OPT_REALM = IF_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0, 2291 OPT_MD5 = IF_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0, 2292 OPT_SETUID = IF_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0, 2293 OPT_PORT = 1 << p_opt_port, 2294 OPT_INETD = 1 << p_opt_inetd, 2295 OPT_FOREGROUND = 1 << p_opt_foreground, 2296 OPT_VERBOSE = 1 << p_opt_verbose, 2297}; 2298 2299 2300int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 2301int httpd_main(int argc UNUSED_PARAM, char **argv) 2302{ 2303 int server_socket = server_socket; /* for gcc */ 2304 unsigned opt; 2305 char *url_for_decode; 2306 IF_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;) 2307 IF_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;) 2308 IF_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;) 2309 IF_FEATURE_HTTPD_AUTH_MD5(const char *pass;) 2310 2311 INIT_G(); 2312 2313#if ENABLE_LOCALE_SUPPORT 2314 /* Undo busybox.c: we want to speak English in http (dates etc) */ 2315 setlocale(LC_TIME, "C"); 2316#endif 2317 2318 home_httpd = xrealloc_getcwd_or_warn(NULL); 2319 /* -v counts, -i implies -f */ 2320 opt_complementary = "vv:if"; 2321 /* We do not "absolutize" path given by -h (home) opt. 2322 * If user gives relative path in -h, 2323 * $SCRIPT_FILENAME will not be set. */ 2324 opt = getopt32(argv, "c:d:h:" 2325 IF_FEATURE_HTTPD_ENCODE_URL_STR("e:") 2326 IF_FEATURE_HTTPD_BASIC_AUTH("r:") 2327 IF_FEATURE_HTTPD_AUTH_MD5("m:") 2328 IF_FEATURE_HTTPD_SETUID("u:") 2329 "p:ifv", 2330 &opt_c_configFile, &url_for_decode, &home_httpd 2331 IF_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode) 2332 IF_FEATURE_HTTPD_BASIC_AUTH(, &g_realm) 2333 IF_FEATURE_HTTPD_AUTH_MD5(, &pass) 2334 IF_FEATURE_HTTPD_SETUID(, &s_ugid) 2335 , &bind_addr_or_port 2336 , &verbose 2337 ); 2338 if (opt & OPT_DECODE_URL) { 2339 fputs(decodeString(url_for_decode, 1), stdout); 2340 return 0; 2341 } 2342#if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR 2343 if (opt & OPT_ENCODE_URL) { 2344 fputs(encodeString(url_for_encode), stdout); 2345 return 0; 2346 } 2347#endif 2348#if ENABLE_FEATURE_HTTPD_AUTH_MD5 2349 if (opt & OPT_MD5) { 2350 char salt[sizeof("$1$XXXXXXXX")]; 2351 salt[0] = '$'; 2352 salt[1] = '1'; 2353 salt[2] = '$'; 2354 crypt_make_salt(salt + 3, 4, 0); 2355 puts(pw_encrypt(pass, salt, 1)); 2356 return 0; 2357 } 2358#endif 2359#if ENABLE_FEATURE_HTTPD_SETUID 2360 if (opt & OPT_SETUID) { 2361 xget_uidgid(&ugid, s_ugid); 2362 } 2363#endif 2364 2365#if !BB_MMU 2366 if (!(opt & OPT_FOREGROUND)) { 2367 bb_daemonize_or_rexec(0, argv); /* don't change current directory */ 2368 } 2369#endif 2370 2371 xchdir(home_httpd); 2372 if (!(opt & OPT_INETD)) { 2373 signal(SIGCHLD, SIG_IGN); 2374 server_socket = openServer(); 2375#if ENABLE_FEATURE_HTTPD_SETUID 2376 /* drop privileges */ 2377 if (opt & OPT_SETUID) { 2378 if (ugid.gid != (gid_t)-1) { 2379 if (setgroups(1, &ugid.gid) == -1) 2380 bb_perror_msg_and_die("setgroups"); 2381 xsetgid(ugid.gid); 2382 } 2383 xsetuid(ugid.uid); 2384 } 2385#endif 2386 } 2387 2388#if 0 2389 /* User can do it himself: 'env - PATH="$PATH" httpd' 2390 * We don't do it because we don't want to screw users 2391 * which want to do 2392 * 'env - VAR1=val1 VAR2=val2 httpd' 2393 * and have VAR1 and VAR2 values visible in their CGIs. 2394 * Besides, it is also smaller. */ 2395 { 2396 char *p = getenv("PATH"); 2397 /* env strings themself are not freed, no need to xstrdup(p): */ 2398 clearenv(); 2399 if (p) 2400 putenv(p - 5); 2401// if (!(opt & OPT_INETD)) 2402// setenv_long("SERVER_PORT", ???); 2403 } 2404#endif 2405 2406 parse_conf(DEFAULT_PATH_HTTPD_CONF, FIRST_PARSE); 2407 if (!(opt & OPT_INETD)) 2408 signal(SIGHUP, sighup_handler); 2409 2410 xfunc_error_retval = 0; 2411 if (opt & OPT_INETD) 2412 mini_httpd_inetd(); 2413#if BB_MMU 2414 if (!(opt & OPT_FOREGROUND)) 2415 bb_daemonize(0); /* don't change current directory */ 2416 mini_httpd(server_socket); /* never returns */ 2417#else 2418 mini_httpd_nommu(server_socket, argc, argv); /* never returns */ 2419#endif 2420 /* return 0; */ 2421} 2422