1 /* vi: set sw=4 ts=4: */
3 * httpd implementation for busybox
5 * Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org>
6 * Copyright (C) 2003-2006 Vladimir Oleynik <dzo@simtreas.ru>
8 * simplify patch stolen from libbb without using strdup
10 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
12 *****************************************************************************
16 * httpd -p 8080 -h $HOME/public_html
17 * or for daemon start from rc script with uid=0:
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"
23 * When a 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.
28 * "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html
30 * The applet can also be invoked as a url arg decoder and html text encoder
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 a url-encoded argument while -e encodes in html
38 * httpd.conf has the following format:
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
49 * P:/url:[http://]hostname[:port]/new/path
50 * # When /urlXXXXXX is requested, reverse proxy
51 * # it to http://hostname[:port]/new/pathXXXXXX
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
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.
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
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)
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.
80 * subdir paths are relative to the containing subdir and thus cannot
81 * affect the parent rules.
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.
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.
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.
99 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
100 # include <sys/sendfile.h>
105 #define IOBUF_SIZE 8192 /* IO buffer */
107 /* amount of buffering in a pipe */
109 # define PIPE_BUF 4096
111 #if PIPE_BUF >= IOBUF_SIZE
112 # error "PIPE_BUF >= IOBUF_SIZE"
115 #define HEADER_READ_TIMEOUT 60
117 static const char DEFAULT_PATH_HTTPD_CONF[] ALIGN1 = "/etc";
118 static const char HTTPD_CONF[] ALIGN1 = "httpd.conf";
119 static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
121 typedef struct has_next_ptr {
122 struct has_next_ptr *next;
125 /* Must have "next" as a first member */
126 typedef struct Htaccess {
127 struct Htaccess *next;
129 char before_colon[1]; /* really bigger, must be last */
132 /* Must have "next" as a first member */
133 typedef struct Htaccess_IP {
134 struct Htaccess_IP *next;
140 /* Must have "next" as a first member */
141 typedef struct Htaccess_Proxy {
142 struct Htaccess_Proxy *next;
150 HTTP_PARTIAL_CONTENT = 206,
151 HTTP_MOVED_TEMPORARILY = 302,
152 HTTP_BAD_REQUEST = 400, /* malformed syntax */
153 HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
154 HTTP_NOT_FOUND = 404,
155 HTTP_FORBIDDEN = 403,
156 HTTP_REQUEST_TIMEOUT = 408,
157 HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */
158 HTTP_INTERNAL_SERVER_ERROR = 500,
160 #if 0 /* future use */
161 HTTP_SWITCHING_PROTOCOLS = 101,
164 HTTP_NON_AUTHORITATIVE_INFO = 203,
165 HTTP_NO_CONTENT = 204,
166 HTTP_MULTIPLE_CHOICES = 300,
167 HTTP_MOVED_PERMANENTLY = 301,
168 HTTP_NOT_MODIFIED = 304,
169 HTTP_PAYMENT_REQUIRED = 402,
170 HTTP_BAD_GATEWAY = 502,
171 HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
172 HTTP_RESPONSE_SETSIZE = 0xffffffff
176 static const uint16_t http_response_type[] ALIGN2 = {
178 #if ENABLE_FEATURE_HTTPD_RANGES
179 HTTP_PARTIAL_CONTENT,
181 HTTP_MOVED_TEMPORARILY,
182 HTTP_REQUEST_TIMEOUT,
183 HTTP_NOT_IMPLEMENTED,
184 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
190 HTTP_INTERNAL_SERVER_ERROR,
191 #if 0 /* not implemented */
195 HTTP_MULTIPLE_CHOICES,
196 HTTP_MOVED_PERMANENTLY,
199 HTTP_SERVICE_UNAVAILABLE,
203 static const struct {
206 } http_response[ARRAY_SIZE(http_response_type)] = {
208 #if ENABLE_FEATURE_HTTPD_RANGES
209 { "Partial Content", NULL },
212 { "Request Timeout", "No request appeared within 60 seconds" },
213 { "Not Implemented", "The requested method is not recognized" },
214 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
215 { "Unauthorized", "" },
217 { "Not Found", "The requested URL was not found" },
218 { "Bad Request", "Unsupported method" },
220 { "Internal Server Error", "Internal Server Error" },
221 #if 0 /* not implemented */
225 { "Multiple Choices" },
226 { "Moved Permanently" },
228 { "Bad Gateway", "" },
229 { "Service Unavailable", "" },
235 int verbose; /* must be int (used by getopt32) */
236 smallint flg_deny_all;
238 unsigned rmt_ip; /* used for IP-based allow/deny rules */
240 char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */
241 const char *bind_addr_or_port;
244 const char *opt_c_configFile;
245 const char *home_httpd;
246 const char *index_page;
248 const char *found_mime_type;
249 const char *found_moved_temporarily;
250 Htaccess_IP *ip_a_d; /* config allow/deny lines */
252 IF_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
253 IF_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
254 IF_FEATURE_HTTPD_CGI(char *referer;)
255 IF_FEATURE_HTTPD_CGI(char *user_agent;)
256 IF_FEATURE_HTTPD_CGI(char *host;)
257 IF_FEATURE_HTTPD_CGI(char *http_accept;)
258 IF_FEATURE_HTTPD_CGI(char *http_accept_language;)
260 off_t file_size; /* -1 - unknown */
261 #if ENABLE_FEATURE_HTTPD_RANGES
267 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
268 Htaccess *g_auth; /* config user:password lines */
270 Htaccess *mime_a; /* config mime types */
271 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
272 Htaccess *script_i; /* config script interpreters */
274 char *iobuf; /* [IOBUF_SIZE] */
275 #define hdr_buf bb_common_bufsiz1
278 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
279 const char *http_error_page[ARRAY_SIZE(http_response_type)];
281 #if ENABLE_FEATURE_HTTPD_PROXY
282 Htaccess_Proxy *proxy;
285 #define G (*ptr_to_globals)
286 #define verbose (G.verbose )
287 #define flg_deny_all (G.flg_deny_all )
288 #define rmt_ip (G.rmt_ip )
289 #define bind_addr_or_port (G.bind_addr_or_port)
290 #define g_query (G.g_query )
291 #define opt_c_configFile (G.opt_c_configFile )
292 #define home_httpd (G.home_httpd )
293 #define index_page (G.index_page )
294 #define found_mime_type (G.found_mime_type )
295 #define found_moved_temporarily (G.found_moved_temporarily)
296 #define last_mod (G.last_mod )
297 #define ip_a_d (G.ip_a_d )
298 #define g_realm (G.g_realm )
299 #define remoteuser (G.remoteuser )
300 #define referer (G.referer )
301 #define user_agent (G.user_agent )
302 #define host (G.host )
303 #define http_accept (G.http_accept )
304 #define http_accept_language (G.http_accept_language)
305 #define file_size (G.file_size )
306 #if ENABLE_FEATURE_HTTPD_RANGES
307 #define range_start (G.range_start )
308 #define range_end (G.range_end )
309 #define range_len (G.range_len )
313 range_end = MAXINT(off_t) - 1,
314 range_len = MAXINT(off_t),
317 #define rmt_ip_str (G.rmt_ip_str )
318 #define g_auth (G.g_auth )
319 #define mime_a (G.mime_a )
320 #define script_i (G.script_i )
321 #define iobuf (G.iobuf )
322 #define hdr_ptr (G.hdr_ptr )
323 #define hdr_cnt (G.hdr_cnt )
324 #define http_error_page (G.http_error_page )
325 #define proxy (G.proxy )
326 #define INIT_G() do { \
327 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
328 IF_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
329 bind_addr_or_port = "80"; \
330 index_page = "index.html"; \
335 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
339 SEND_HEADERS = (1 << 0),
340 SEND_BODY = (1 << 1),
341 SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY,
343 static void send_file_and_exit(const char *url, int what) NORETURN;
345 static void free_llist(has_next_ptr **pptr)
347 has_next_ptr *cur = *pptr;
349 has_next_ptr *t = cur;
356 static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
358 free_llist((has_next_ptr**)pptr);
361 static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
363 free_llist((has_next_ptr**)pptr);
366 /* Returns presumed mask width in bits or < 0 on error.
367 * Updates strp, stores IP at provided pointer */
368 static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
370 const char *p = *strp;
378 for (j = 0; j < 4; j++) {
381 if ((*p < '0' || *p > '9') && *p != '/' && *p)
384 while (*p >= '0' && *p <= '9') {
395 ip = (ip << 8) | octet;
409 /* Returns 0 on success. Stores IP and mask at provided pointers */
410 static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
416 i = scan_ip(&str, ipp, '/');
421 /* there is /xxx after dotted-IP address */
422 i = bb_strtou(str, &p, 10);
424 /* 'xxx' itself is dotted-IP mask, parse it */
425 /* (return 0 (success) only if it has N.N.N.N form) */
426 return scan_ip(&str, maskp, '\0') - 32;
435 if (sizeof(unsigned) == 4 && i == 32) {
436 /* mask >>= 32 below may not work */
442 /* i == 0 -> *maskp = 0x00000000
443 * i == 1 -> *maskp = 0x80000000
444 * i == 4 -> *maskp = 0xf0000000
445 * i == 31 -> *maskp = 0xfffffffe
446 * i == 32 -> *maskp = 0xffffffff */
447 *maskp = (uint32_t)(~mask);
452 * Parse configuration file into in-memory linked list.
454 * Any previous IP rules are discarded.
455 * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
456 * are also discarded. That is, previous settings are retained if flag is
458 * Error pages are only parsed on the main config file.
460 * path Path where to look for httpd.conf (without filename).
461 * flag Type of the parse request.
465 FIRST_PARSE = 0, /* path will be "/etc" */
466 SIGNALED_PARSE = 1, /* path will be "/etc" */
467 SUBDIR_PARSE = 2, /* path will be derived from URL */
469 static void parse_conf(const char *path, int flag)
471 /* internally used extra flag state */
472 enum { TRY_CURDIR_PARSE = 3 };
475 const char *filename;
478 /* discard old rules */
479 free_Htaccess_IP_list(&ip_a_d);
481 /* retain previous auth and mime config only for subdir parse */
482 if (flag != SUBDIR_PARSE) {
483 free_Htaccess_list(&mime_a);
484 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
485 free_Htaccess_list(&g_auth);
487 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
488 free_Htaccess_list(&script_i);
492 filename = opt_c_configFile;
493 if (flag == SUBDIR_PARSE || filename == NULL) {
494 filename = alloca(strlen(path) + sizeof(HTTPD_CONF) + 2);
495 sprintf((char *)filename, "%s/%s", path, HTTPD_CONF);
498 while ((f = fopen_for_read(filename)) == NULL) {
499 if (flag >= SUBDIR_PARSE) { /* SUBDIR or TRY_CURDIR */
500 /* config file not found, no changes to config */
503 if (flag == FIRST_PARSE) {
504 /* -c CONFFILE given, but CONFFILE doesn't exist? */
505 if (opt_c_configFile)
506 bb_simple_perror_msg_and_die(opt_c_configFile);
507 /* else: no -c, thus we looked at /etc/httpd.conf,
508 * and it's not there. try ./httpd.conf: */
510 flag = TRY_CURDIR_PARSE;
511 filename = HTTPD_CONF;
514 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
515 /* in "/file:user:pass" lines, we prepend path in subdirs */
516 if (flag != SUBDIR_PARSE)
521 * I:default_index_file
523 * [AD]:IP[/mask] # allow/deny, * for wildcard
524 * Ennn:error.html # error page for status nnn
525 * P:/url:[http://]hostname[:port]/new/path # reverse proxy
526 * .ext:mime/type # mime type
527 * *.php:/path/php # run xxx.php through an interpreter
528 * /file:user:pass # username and password
530 while (fgets(buf, sizeof(buf), f) != NULL) {
535 { /* remove all whitespace, and # comments */
539 /* skip non-whitespace beginning. Often the whole line
540 * is non-whitespace. We want this case to work fast,
541 * without needless copying, therefore we don't merge
542 * this operation into next while loop. */
543 while ((ch = *p0) != '\0' && ch != '\n' && ch != '#'
544 && ch != ' ' && ch != '\t'
549 /* if we enter this loop, we have some whitespace.
551 while (ch != '\0' && ch != '\n' && ch != '#') {
552 if (ch != ' ' && ch != '\t') {
558 strlen_buf = p - buf;
560 continue; /* empty line */
563 after_colon = strchr(buf, ':');
565 if (after_colon == NULL || *++after_colon == '\0')
568 ch = (buf[0] & ~0x20); /* toupper if it's a letter */
571 index_page = xstrdup(after_colon);
575 /* do not allow jumping around using H in subdir's configs */
576 if (flag == FIRST_PARSE && ch == 'H') {
577 home_httpd = xstrdup(after_colon);
582 if (ch == 'A' || ch == 'D') {
585 if (*after_colon == '*') {
587 /* memorize "deny all" */
590 /* skip assumed "A:*", it is a default anyway */
593 /* store "allow/deny IP/mask" line */
594 pip = xzalloc(sizeof(*pip));
595 if (scan_ip_mask(after_colon, &pip->ip, &pip->mask)) {
596 /* IP{/mask} syntax error detected, protect all */
600 pip->allow_deny = ch;
602 /* Deny:from_IP - prepend */
606 /* A:from_IP - append (thus all D's precedes A's) */
607 Htaccess_IP *prev_IP = ip_a_d;
608 if (prev_IP == NULL) {
611 while (prev_IP->next)
612 prev_IP = prev_IP->next;
619 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
620 if (flag == FIRST_PARSE && ch == 'E') {
622 int status = atoi(buf + 1); /* error status code */
624 if (status < HTTP_CONTINUE) {
627 /* then error page; find matching status */
628 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
629 if (http_response_type[i] == status) {
630 /* We chdir to home_httpd, thus no need to
631 * concat_path_file(home_httpd, after_colon)
633 http_error_page[i] = xstrdup(after_colon);
641 #if ENABLE_FEATURE_HTTPD_PROXY
642 if (flag == FIRST_PARSE && ch == 'P') {
643 /* P:/url:[http://]hostname[:port]/new/path */
644 char *url_from, *host_port, *url_to;
645 Htaccess_Proxy *proxy_entry;
647 url_from = after_colon;
648 host_port = strchr(after_colon, ':');
649 if (host_port == NULL) {
653 if (strncmp(host_port, "http://", 7) == 0)
655 if (*host_port == '\0') {
658 url_to = strchr(host_port, '/');
659 if (url_to == NULL) {
663 proxy_entry = xzalloc(sizeof(*proxy_entry));
664 proxy_entry->url_from = xstrdup(url_from);
665 proxy_entry->host_port = xstrdup(host_port);
667 proxy_entry->url_to = xstrdup(url_to);
668 proxy_entry->next = proxy;
673 /* the rest of directives are non-alphabetic,
674 * must avoid using "toupper'ed" ch */
677 if (ch == '.' /* ".ext:mime/type" */
678 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
679 || (ch == '*' && buf[1] == '.') /* "*.php:/path/php" */
685 cur = xzalloc(sizeof(*cur) /* includes space for NUL */ + strlen_buf);
686 strcpy(cur->before_colon, buf);
687 p = cur->before_colon + (after_colon - buf);
689 cur->after_colon = p;
691 /* .mime line: prepend to mime_a list */
695 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
697 /* script interpreter line: prepend to script_i list */
698 cur->next = script_i;
705 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
706 if (ch == '/') { /* "/file:user:pass" */
711 /* note: path is "" unless we are in SUBDIR parse,
712 * otherwise it does NOT start with "/" */
713 cur = xzalloc(sizeof(*cur) /* includes space for NUL */
717 /* form "/path/file" */
718 sprintf(cur->before_colon, "/%s%.*s",
720 after_colon - buf - 1, /* includes "/", but not ":" */
722 /* canonicalize it */
723 p = bb_simplify_abs_path_inplace(cur->before_colon);
724 file_len = p - cur->before_colon;
725 /* add "user:pass" after NUL */
726 strcpy(++p, after_colon);
727 cur->after_colon = p;
729 /* insert cur into g_auth */
730 /* g_auth is sorted by decreased filename length */
732 Htaccess *auth, **authp;
735 while ((auth = *authp) != NULL) {
736 if (file_len >= strlen(auth->before_colon)) {
737 /* insert cur before auth */
747 #endif /* BASIC_AUTH */
749 /* the line is not recognized */
751 bb_error_msg("config error '%s' in '%s'", buf, filename);
752 } /* while (fgets) */
757 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
759 * Given a string, html-encode special characters.
760 * This is used for the -e command line option to provide an easy way
761 * for scripts to encode result data without confusing browsers. The
762 * returned string pointer is memory allocated by malloc().
764 * Returns a pointer to the encoded string (malloced).
766 static char *encodeString(const char *string)
768 /* take the simple route and encode everything */
769 /* could possibly scan once to get length. */
770 int len = strlen(string);
771 char *out = xmalloc(len * 6 + 1);
775 while ((ch = *string++)) {
776 /* very simple check for what to encode */
780 p += sprintf(p, "&#%d;", (unsigned char) ch);
785 #endif /* FEATURE_HTTPD_ENCODE_URL_STR */
788 * Given a URL encoded string, convert it to plain ascii.
789 * Since decoding always makes strings smaller, the decode is done in-place.
790 * Thus, callers should xstrdup() the argument if they do not want the
791 * argument modified. The return is the original pointer, allowing this
792 * function to be easily used as arguments to other functions.
794 * string The first string to decode.
795 * option_d 1 if called for httpd -d
797 * Returns a pointer to the decoded string (same as input).
799 static unsigned hex_to_bin(unsigned char c)
806 /* c | 0x20: letters to lower case, non-letters
807 * to (potentially different) non-letters */
808 v = (unsigned)(c | 0x20) - 'a';
814 void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
815 int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
816 t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
818 static char *decodeString(char *orig, int option_d)
820 /* note that decoded string is always shorter than original */
825 while ((c = *ptr++) != '\0') {
828 if (option_d && c == '+') {
836 v = hex_to_bin(ptr[0]);
844 v = (v * 16) | hex_to_bin(ptr[1]);
847 if (!option_d && (v == '/' || v == '\0')) {
848 /* caller takes it as indication of invalid
849 * (dangerous wrt exploits) chars */
859 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
861 * Decode a base64 data stream as per rfc1521.
862 * Note that the rfc states that non base64 chars are to be ignored.
863 * Since the decode always results in a shorter size than the input,
864 * it is OK to pass the input arg as an output arg.
865 * Parameter: a pointer to a base64 encoded string.
866 * Decoded data is stored in-place.
868 static void decodeBase64(char *Data)
870 const unsigned char *in = (const unsigned char *)Data;
871 /* The decoded size will be at most 3/4 the size of the encoded */
878 if (t >= '0' && t <= '9')
880 else if (t >= 'A' && t <= 'Z')
882 else if (t >= 'a' && t <= 'z')
896 *Data++ = (char) (ch >> 16);
897 *Data++ = (char) (ch >> 8);
907 * Create a listen server socket on the designated port.
909 static int openServer(void)
911 unsigned n = bb_strtou(bind_addr_or_port, NULL, 10);
912 if (!errno && n && n <= 0xffff)
913 n = create_and_bind_stream_or_die(NULL, n);
915 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
921 * Log the connection closure and exit.
923 static void log_and_exit(void) NORETURN;
924 static void log_and_exit(void)
926 /* Paranoia. IE said to be buggy. It may send some extra data
927 * or be confused by us just exiting without SHUT_WR. Oh well. */
928 shutdown(1, SHUT_WR);
930 (this also messes up stdin when user runs httpd -i from terminal)
932 while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0)
937 bb_error_msg("closed");
938 _exit(xfunc_error_retval);
942 * Create and send HTTP response headers.
943 * The arguments are combined and sent as one write operation. Note that
944 * IE will puke big-time if the headers are not sent in one packet and the
945 * second packet is delayed for any reason.
946 * responseNum - the result code to send.
948 static void send_headers(int responseNum)
950 static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
952 const char *responseString = "";
953 const char *infoString = NULL;
954 const char *mime_type;
955 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
956 const char *error_page = NULL;
959 time_t timer = time(NULL);
963 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
964 if (http_response_type[i] == responseNum) {
965 responseString = http_response[i].name;
966 infoString = http_response[i].info;
967 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
968 error_page = http_error_page[i];
973 /* error message is HTML */
974 mime_type = responseNum == HTTP_OK ?
975 found_mime_type : "text/html";
978 bb_error_msg("response:%u", responseNum);
980 /* emit the current date */
981 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
983 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
984 "Date: %s\r\nConnection: close\r\n",
985 responseNum, responseString, mime_type, tmp_str);
987 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
988 if (responseNum == HTTP_UNAUTHORIZED) {
989 len += sprintf(iobuf + len,
990 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
994 if (responseNum == HTTP_MOVED_TEMPORARILY) {
995 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
996 found_moved_temporarily,
997 (g_query ? "?" : ""),
998 (g_query ? g_query : ""));
1001 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
1002 if (error_page && access(error_page, R_OK) == 0) {
1003 strcat(iobuf, "\r\n");
1007 fprintf(stderr, "headers: '%s'\n", iobuf);
1008 full_write(STDOUT_FILENO, iobuf, len);
1010 fprintf(stderr, "writing error page: '%s'\n", error_page);
1011 return send_file_and_exit(error_page, SEND_BODY);
1015 if (file_size != -1) { /* file */
1016 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
1017 #if ENABLE_FEATURE_HTTPD_RANGES
1018 if (responseNum == HTTP_PARTIAL_CONTENT) {
1019 len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n",
1023 file_size = range_end - range_start + 1;
1026 len += sprintf(iobuf + len,
1027 #if ENABLE_FEATURE_HTTPD_RANGES
1028 "Accept-Ranges: bytes\r\n"
1030 "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
1036 iobuf[len++] = '\r';
1037 iobuf[len++] = '\n';
1039 len += sprintf(iobuf + len,
1040 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
1041 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
1042 responseNum, responseString,
1043 responseNum, responseString, infoString);
1046 fprintf(stderr, "headers: '%s'\n", iobuf);
1047 if (full_write(STDOUT_FILENO, iobuf, len) != len) {
1049 bb_perror_msg("error");
1054 static void send_headers_and_exit(int responseNum) NORETURN;
1055 static void send_headers_and_exit(int responseNum)
1057 send_headers(responseNum);
1062 * Read from the socket until '\n' or EOF. '\r' chars are removed.
1063 * '\n' is replaced with NUL.
1064 * Return number of characters read or 0 if nothing is read
1065 * ('\r' and '\n' are not counted).
1066 * Data is returned in iobuf.
1068 static int get_line(void)
1073 alarm(HEADER_READ_TIMEOUT);
1076 hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1081 iobuf[count] = c = *hdr_ptr++;
1087 iobuf[count] = '\0';
1090 if (count < (IOBUF_SIZE - 1)) /* check overflow */
1096 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1098 /* gcc 4.2.1 fares better with NOINLINE */
1099 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN;
1100 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1102 enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1103 struct pollfd pfd[3];
1104 int out_cnt; /* we buffer a bit of initial CGI output */
1107 /* iobuf is used for CGI -> network data,
1108 * hdr_buf is for network -> CGI data (POSTDATA) */
1110 /* If CGI dies, we still want to correctly finish reading its output
1111 * and send it to the peer. So please no SIGPIPEs! */
1112 signal(SIGPIPE, SIG_IGN);
1114 // We inconsistently handle a case when more POSTDATA from network
1115 // is coming than we expected. We may give *some part* of that
1116 // extra data to CGI.
1118 //if (hdr_cnt > post_len) {
1119 // /* We got more POSTDATA from network than we expected */
1120 // hdr_cnt = post_len;
1122 post_len -= hdr_cnt;
1123 /* post_len - number of POST bytes not yet read from network */
1125 /* NB: breaking out of this loop jumps to log_and_exit() */
1128 memset(pfd, 0, sizeof(pfd));
1130 pfd[FROM_CGI].fd = fromCgi_rd;
1131 pfd[FROM_CGI].events = POLLIN;
1134 pfd[TO_CGI].fd = toCgi_wr;
1136 pfd[TO_CGI].events = POLLOUT;
1137 } else if (post_len > 0) {
1138 pfd[0].events = POLLIN;
1140 /* post_len <= 0 && hdr_cnt <= 0:
1141 * no more POST data to CGI,
1142 * let CGI see EOF on CGI's stdin */
1148 /* Now wait on the set of sockets */
1149 count = safe_poll(pfd, 3, -1);
1152 if (safe_waitpid(pid, &status, WNOHANG) <= 0) {
1153 /* Weird. CGI didn't exit and no fd's
1154 * are ready, yet poll returned?! */
1157 if (DEBUG && WIFEXITED(status))
1158 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1159 if (DEBUG && WIFSIGNALED(status))
1160 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1165 if (pfd[TO_CGI].revents) {
1166 /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */
1167 /* Have data from peer and can write to CGI */
1168 count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1169 /* Doesn't happen, we dont use nonblocking IO here
1170 *if (count < 0 && errno == EAGAIN) {
1177 /* EOF/broken pipe to CGI, stop piping POST data */
1178 hdr_cnt = post_len = 0;
1182 if (pfd[0].revents) {
1183 /* post_len > 0 && hdr_cnt == 0 here */
1184 /* We expect data, prev data portion is eaten by CGI
1185 * and there *is* data to read from the peer
1187 //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
1188 //count = safe_read(STDIN_FILENO, hdr_buf, count);
1189 count = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1195 /* no more POST data can be read */
1200 if (pfd[FROM_CGI].revents) {
1201 /* There is something to read from CGI */
1204 /* Are we still buffering CGI output? */
1206 /* HTTP_200[] has single "\r\n" at the end.
1207 * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1208 * CGI scripts MUST send their own header terminated by
1209 * empty line, then data. That's why we have only one
1210 * <cr><lf> pair here. We will output "200 OK" line
1211 * if needed, but CGI still has to provide blank line
1212 * between header and body */
1214 /* Must use safe_read, not full_read, because
1215 * CGI may output a few first bytes and then wait
1216 * for POSTDATA without closing stdout.
1217 * With full_read we may wait here forever. */
1218 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1220 /* eof (or error) and there was no "HTTP",
1221 * so write it, then write received data */
1223 full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1);
1224 full_write(STDOUT_FILENO, rbuf, out_cnt);
1226 break; /* CGI stdout is closed, exiting */
1230 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1231 if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1232 /* send "HTTP/1.0 " */
1233 if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9)
1235 rbuf += 8; /* skip "Status: " */
1236 count = out_cnt - 8;
1237 out_cnt = -1; /* buffering off */
1238 } else if (out_cnt >= 4) {
1239 /* Did CGI add "HTTP"? */
1240 if (memcmp(rbuf, HTTP_200, 4) != 0) {
1241 /* there is no "HTTP", do it ourself */
1242 if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1246 if (!strstr(rbuf, "ontent-")) {
1247 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1249 * Counter-example of valid CGI without Content-type:
1250 * echo -en "HTTP/1.0 302 Found\r\n"
1251 * echo -en "Location: http://www.busybox.net\r\n"
1255 out_cnt = -1; /* buffering off */
1258 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1260 break; /* eof (or error) */
1262 if (full_write(STDOUT_FILENO, rbuf, count) != count)
1265 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1266 } /* if (pfd[FROM_CGI].revents) */
1272 #if ENABLE_FEATURE_HTTPD_CGI
1274 static void setenv1(const char *name, const char *value)
1276 setenv(name, value ? value : "", 1);
1280 * Spawn CGI script, forward CGI's stdin/out <=> network
1282 * Environment variables are set up and the script is invoked with pipes
1283 * for stdin/stdout. If a POST is being done the script is fed the POST
1284 * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1287 * const char *url The requested URL (with leading /).
1288 * int post_len Length of the POST body.
1289 * const char *cookie For set HTTP_COOKIE.
1290 * const char *content_type For set CONTENT_TYPE.
1292 static void send_cgi_and_exit(
1294 const char *request,
1297 const char *content_type) NORETURN;
1298 static void send_cgi_and_exit(
1300 const char *request,
1303 const char *content_type)
1305 struct fd_pair fromCgi; /* CGI -> httpd pipe */
1306 struct fd_pair toCgi; /* httpd -> CGI pipe */
1310 /* Make a copy. NB: caller guarantees:
1311 * url[0] == '/', url[1] != '/' */
1315 * We are mucking with environment _first_ and then vfork/exec,
1316 * this allows us to use vfork safely. Parent doesn't care about
1317 * these environment changes anyway.
1320 /* Check for [dirs/]script.cgi/PATH_INFO */
1321 script = (char*)url;
1322 while ((script = strchr(script + 1, '/')) != NULL) {
1326 if (!is_directory(url + 1, 1, &sb)) {
1327 /* not directory, found script.cgi/PATH_INFO */
1331 *script = '/'; /* is directory, find next '/' */
1333 setenv1("PATH_INFO", script); /* set to /PATH_INFO or "" */
1334 setenv1("REQUEST_METHOD", request);
1336 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", url, g_query));
1338 setenv1("REQUEST_URI", url);
1341 *script = '\0'; /* cut off /PATH_INFO */
1343 /* SCRIPT_FILENAME is required by PHP in CGI mode */
1344 if (home_httpd[0] == '/') {
1345 char *fullpath = concat_path_file(home_httpd, url);
1346 setenv1("SCRIPT_FILENAME", fullpath);
1348 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1349 setenv1("SCRIPT_NAME", url);
1350 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1351 * QUERY_STRING: The information which follows the ? in the URL
1352 * which referenced this script. This is the query information.
1353 * It should not be decoded in any fashion. This variable
1354 * should always be set when there is query information,
1355 * regardless of command line decoding. */
1356 /* (Older versions of bbox seem to do some decoding) */
1357 setenv1("QUERY_STRING", g_query);
1358 putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1359 putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1360 putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1361 /* Having _separate_ variables for IP and port defeats
1362 * the purpose of having socket abstraction. Which "port"
1363 * are you using on Unix domain socket?
1364 * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1367 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1368 char *cp = strrchr(p, ':');
1369 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1371 if (cp) *cp = '\0'; /* delete :PORT */
1372 setenv1("REMOTE_ADDR", p);
1375 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1376 setenv1("REMOTE_PORT", cp + 1);
1380 setenv1("HTTP_USER_AGENT", user_agent);
1382 setenv1("HTTP_ACCEPT", http_accept);
1383 if (http_accept_language)
1384 setenv1("HTTP_ACCEPT_LANGUAGE", http_accept_language);
1386 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1388 setenv1("HTTP_COOKIE", cookie);
1390 setenv1("CONTENT_TYPE", content_type);
1391 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1393 setenv1("REMOTE_USER", remoteuser);
1394 putenv((char*)"AUTH_TYPE=Basic");
1398 setenv1("HTTP_REFERER", referer);
1399 setenv1("HTTP_HOST", host); /* set to "" if NULL */
1400 /* setenv1("SERVER_NAME", safe_gethostname()); - don't do this,
1401 * just run "env SERVER_NAME=xyz httpd ..." instead */
1403 xpiped_pair(fromCgi);
1408 /* TODO: log perror? */
1416 xfunc_error_retval = 242;
1418 /* NB: close _first_, then move fds! */
1421 xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */
1422 xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */
1423 /* User seeing stderr output can be a security problem.
1424 * If CGI really wants that, it can always do dup itself. */
1427 /* Chdiring to script's dir */
1428 script = strrchr(url, '/');
1429 if (script != url) { /* paranoia */
1431 if (chdir(url + 1) != 0) {
1432 bb_perror_msg("chdir %s", url + 1);
1433 goto error_execing_cgi;
1435 // not needed: *script = '/';
1439 /* set argv[0] to name without path */
1443 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1445 char *suffix = strrchr(script, '.');
1449 for (cur = script_i; cur; cur = cur->next) {
1450 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1451 /* found interpreter name */
1452 argv[0] = cur->after_colon;
1461 /* restore default signal dispositions for CGI process */
1468 /* _NOT_ execvp. We do not search PATH. argv[0] is a filename
1469 * without any dir components and will only match a file
1470 * in the current directory */
1471 execv(argv[0], argv);
1473 bb_perror_msg("exec %s", argv[0]);
1476 * (we are CGI here, our stdout is pumped to the net) */
1477 send_headers_and_exit(HTTP_NOT_FOUND);
1480 /* Parent process */
1482 /* Restore variables possibly changed by child */
1483 xfunc_error_retval = 0;
1488 cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1491 #endif /* FEATURE_HTTPD_CGI */
1494 * Send a file response to a HTTP request, and exit
1497 * const char *url The requested URL (with leading /).
1498 * what What to send (headers/body/both).
1500 static NOINLINE void send_file_and_exit(const char *url, int what)
1502 static const char *const suffixTable[] = {
1503 /* Warning: shorter equivalent suffix in one line must be first */
1504 ".htm.html", "text/html",
1505 ".jpg.jpeg", "image/jpeg",
1506 ".gif", "image/gif",
1507 ".png", "image/png",
1508 ".txt.h.c.cc.cpp", "text/plain",
1510 ".wav", "audio/wav",
1511 ".avi", "video/x-msvideo",
1512 ".qt.mov", "video/quicktime",
1513 ".mpe.mpeg", "video/mpeg",
1514 ".mid.midi", "audio/midi",
1515 ".mp3", "audio/mpeg",
1516 #if 0 /* unpopular */
1517 ".au", "audio/basic",
1518 ".pac", "application/x-ns-proxy-autoconfig",
1519 ".vrml.wrl", "model/vrml",
1526 const char *const *table;
1527 const char *try_suffix;
1530 fd = open(url, O_RDONLY);
1533 bb_perror_msg("can't open '%s'", url);
1534 /* Error pages are sent by using send_file_and_exit(SEND_BODY).
1535 * IOW: it is unsafe to call send_headers_and_exit
1536 * if what is SEND_BODY! Can recurse! */
1537 if (what != SEND_BODY)
1538 send_headers_and_exit(HTTP_NOT_FOUND);
1543 bb_error_msg("sending file '%s' content-type: %s",
1544 url, found_mime_type);
1546 /* If you want to know about EPIPE below
1547 * (happens if you abort downloads from local httpd): */
1548 signal(SIGPIPE, SIG_IGN);
1550 suffix = strrchr(url, '.');
1552 /* If not found, set default as "application/octet-stream"; */
1553 found_mime_type = "application/octet-stream";
1556 for (table = suffixTable; *table; table += 2) {
1557 try_suffix = strstr(table[0], suffix);
1559 try_suffix += strlen(suffix);
1560 if (*try_suffix == '\0' || *try_suffix == '.') {
1561 found_mime_type = table[1];
1566 for (cur = mime_a; cur; cur = cur->next) {
1567 if (strcmp(cur->before_colon, suffix) == 0) {
1568 found_mime_type = cur->after_colon;
1573 #if ENABLE_FEATURE_HTTPD_RANGES
1574 if (what == SEND_BODY)
1575 range_start = 0; /* err pages and ranges don't mix */
1576 range_len = MAXINT(off_t);
1579 range_end = file_size - 1;
1581 if (range_end < range_start
1582 || lseek(fd, range_start, SEEK_SET) != range_start
1584 lseek(fd, 0, SEEK_SET);
1587 range_len = range_end - range_start + 1;
1588 send_headers(HTTP_PARTIAL_CONTENT);
1593 if (what & SEND_HEADERS)
1594 send_headers(HTTP_OK);
1595 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1597 off_t offset = range_start;
1599 /* sz is rounded down to 64k */
1600 ssize_t sz = MAXINT(ssize_t) - 0xffff;
1601 IF_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1602 count = sendfile(STDOUT_FILENO, fd, &offset, sz);
1604 if (offset == range_start)
1605 break; /* fall back to read/write loop */
1608 IF_FEATURE_HTTPD_RANGES(range_len -= sz;)
1609 if (count == 0 || range_len == 0)
1614 while ((count = safe_read(fd, iobuf, IOBUF_SIZE)) > 0) {
1616 IF_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1617 n = full_write(STDOUT_FILENO, iobuf, count);
1620 IF_FEATURE_HTTPD_RANGES(range_len -= count;)
1625 IF_FEATURE_HTTPD_USE_SENDFILE(fin:)
1627 bb_perror_msg("error");
1632 static int checkPermIP(void)
1636 for (cur = ip_a_d; cur; cur = cur->next) {
1639 "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1641 (unsigned char)(cur->ip >> 24),
1642 (unsigned char)(cur->ip >> 16),
1643 (unsigned char)(cur->ip >> 8),
1644 (unsigned char)(cur->ip),
1645 (unsigned char)(cur->mask >> 24),
1646 (unsigned char)(cur->mask >> 16),
1647 (unsigned char)(cur->mask >> 8),
1648 (unsigned char)(cur->mask)
1651 if ((rmt_ip & cur->mask) == cur->ip)
1652 return (cur->allow_deny == 'A'); /* A -> 1 */
1655 return !flg_deny_all; /* depends on whether we saw "D:*" */
1658 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1660 * Config file entries are of the form "/<path>:<user>:<passwd>".
1661 * If config file has no prefix match for path, access is allowed.
1663 * path The file path
1664 * user_and_passwd "user:passwd" to validate
1666 * Returns 1 if user_and_passwd is OK.
1668 static int check_user_passwd(const char *path, const char *user_and_passwd)
1671 const char *prev = NULL;
1673 for (cur = g_auth; cur; cur = cur->next) {
1674 const char *dir_prefix;
1677 dir_prefix = cur->before_colon;
1680 /* If already saw a match, don't accept other different matches */
1681 if (prev && strcmp(prev, dir_prefix) != 0)
1685 fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd);
1687 /* If it's not a prefix match, continue searching */
1688 len = strlen(dir_prefix);
1689 if (len != 1 /* dir_prefix "/" matches all, don't need to check */
1690 && (strncmp(dir_prefix, path, len) != 0
1691 || (path[len] != '/' && path[len] != '\0'))
1696 /* Path match found */
1699 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1702 md5_passwd = strchr(cur->after_colon, ':');
1703 if (md5_passwd && md5_passwd[1] == '$' && md5_passwd[2] == '1'
1704 && md5_passwd[3] == '$' && md5_passwd[4]
1710 user_len_p1 = md5_passwd - cur->after_colon;
1711 /* comparing "user:" */
1712 if (strncmp(cur->after_colon, user_and_passwd, user_len_p1) != 0) {
1716 encrypted = pw_encrypt(
1717 user_and_passwd + user_len_p1 /* cleartext pwd from user */,
1718 md5_passwd /*salt */, 1 /* cleanup */);
1719 r = strcmp(encrypted, md5_passwd);
1722 goto set_remoteuser_var; /* Ok */
1727 /* Comparing plaintext "user:pass" in one go */
1728 if (strcmp(cur->after_colon, user_and_passwd) == 0) {
1730 remoteuser = xstrndup(user_and_passwd,
1731 strchrnul(user_and_passwd, ':') - user_and_passwd);
1736 /* 0(bad) if prev is set: matches were found but passwd was wrong */
1737 return (prev == NULL);
1739 #endif /* FEATURE_HTTPD_BASIC_AUTH */
1741 #if ENABLE_FEATURE_HTTPD_PROXY
1742 static Htaccess_Proxy *find_proxy_entry(const char *url)
1745 for (p = proxy; p; p = p->next) {
1746 if (strncmp(url, p->url_from, strlen(p->url_from)) == 0)
1756 static void send_REQUEST_TIMEOUT_and_exit(int sig) NORETURN;
1757 static void send_REQUEST_TIMEOUT_and_exit(int sig UNUSED_PARAM)
1759 send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1763 * Handle an incoming http request and exit.
1765 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN;
1766 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1768 static const char request_GET[] ALIGN1 = "GET";
1773 #if ENABLE_FEATURE_HTTPD_CGI
1774 static const char request_HEAD[] ALIGN1 = "HEAD";
1775 const char *prequest;
1776 char *cookie = NULL;
1777 char *content_type = NULL;
1778 unsigned long length = 0;
1779 #elif ENABLE_FEATURE_HTTPD_PROXY
1780 #define prequest request_GET
1781 unsigned long length = 0;
1783 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1784 smallint authorized = -1;
1786 smallint ip_allowed;
1787 char http_major_version;
1788 #if ENABLE_FEATURE_HTTPD_PROXY
1789 char http_minor_version;
1790 char *header_buf = header_buf; /* for gcc */
1791 char *header_ptr = header_ptr;
1792 Htaccess_Proxy *proxy_entry;
1795 /* Allocation of iobuf is postponed until now
1796 * (IOW, server process doesn't need to waste 8k) */
1797 iobuf = xmalloc(IOBUF_SIZE);
1800 if (fromAddr->u.sa.sa_family == AF_INET) {
1801 rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr);
1803 #if ENABLE_FEATURE_IPV6
1804 if (fromAddr->u.sa.sa_family == AF_INET6
1805 && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0
1806 && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0
1807 && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1808 rmt_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]);
1810 if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1811 /* NB: can be NULL (user runs httpd -i by hand?) */
1812 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa);
1815 /* this trick makes -v logging much simpler */
1817 applet_name = rmt_ip_str;
1819 bb_error_msg("connected");
1822 /* Install timeout handler. get_line() needs it. */
1823 signal(SIGALRM, send_REQUEST_TIMEOUT_and_exit);
1825 if (!get_line()) /* EOF or error or empty line */
1826 send_headers_and_exit(HTTP_BAD_REQUEST);
1828 /* Determine type of request (GET/POST) */
1829 urlp = strpbrk(iobuf, " \t");
1831 send_headers_and_exit(HTTP_BAD_REQUEST);
1833 #if ENABLE_FEATURE_HTTPD_CGI
1834 prequest = request_GET;
1835 if (strcasecmp(iobuf, prequest) != 0) {
1836 prequest = request_HEAD;
1837 if (strcasecmp(iobuf, prequest) != 0) {
1839 if (strcasecmp(iobuf, prequest) != 0)
1840 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1844 if (strcasecmp(iobuf, request_GET) != 0)
1845 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1847 urlp = skip_whitespace(urlp);
1849 send_headers_and_exit(HTTP_BAD_REQUEST);
1851 /* Find end of URL and parse HTTP version, if any */
1852 http_major_version = '0';
1853 IF_FEATURE_HTTPD_PROXY(http_minor_version = '0';)
1854 tptr = strchrnul(urlp, ' ');
1855 /* Is it " HTTP/"? */
1856 if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) {
1857 http_major_version = tptr[6];
1858 IF_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];)
1862 /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
1863 urlcopy = alloca((tptr - urlp) + 2 + strlen(index_page));
1864 /*if (urlcopy == NULL)
1865 * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
1866 strcpy(urlcopy, urlp);
1867 /* NB: urlcopy ptr is never changed after this */
1869 /* Extract url args if present */
1871 tptr = strchr(urlcopy, '?');
1877 /* Decode URL escape sequences */
1878 tptr = decodeString(urlcopy, 0);
1880 send_headers_and_exit(HTTP_BAD_REQUEST);
1881 if (tptr == urlcopy + 1) {
1882 /* '/' or NUL is encoded */
1883 send_headers_and_exit(HTTP_NOT_FOUND);
1886 /* Canonicalize path */
1887 /* Algorithm stolen from libbb bb_simplify_path(),
1888 * but don't strdup, retain trailing slash, protect root */
1889 urlp = tptr = urlcopy;
1892 /* skip duplicate (or initial) slash */
1897 /* skip extra "/./" */
1898 if (tptr[1] == '/' || !tptr[1]) {
1901 /* "..": be careful */
1902 if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
1904 if (urlp == urlcopy) /* protect root */
1905 send_headers_and_exit(HTTP_BAD_REQUEST);
1906 while (*--urlp != '/') /* omit previous dir */;
1913 *++urlp = '\0'; /* terminate after last character */
1915 /* If URL is a directory, add '/' */
1916 if (urlp[-1] != '/') {
1917 if (is_directory(urlcopy + 1, 1, &sb)) {
1918 found_moved_temporarily = urlcopy;
1924 bb_error_msg("url:%s", urlcopy);
1927 ip_allowed = checkPermIP();
1928 while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
1929 /* have path1/path2 */
1931 if (is_directory(urlcopy + 1, 1, &sb)) {
1932 /* may have subdir config */
1933 parse_conf(urlcopy + 1, SUBDIR_PARSE);
1934 ip_allowed = checkPermIP();
1939 #if ENABLE_FEATURE_HTTPD_PROXY
1940 proxy_entry = find_proxy_entry(urlcopy);
1942 header_buf = header_ptr = xmalloc(IOBUF_SIZE);
1945 if (http_major_version >= '0') {
1946 /* Request was with "... HTTP/nXXX", and n >= 0 */
1948 /* Read until blank line for HTTP version specified, else parse immediate */
1951 break; /* EOF or error or empty line */
1953 bb_error_msg("header: '%s'", iobuf);
1955 #if ENABLE_FEATURE_HTTPD_PROXY
1956 /* We need 2 more bytes for yet another "\r\n" -
1957 * see near fdprintf(proxy_fd...) further below */
1958 if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) {
1959 int len = strlen(iobuf);
1960 if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4)
1961 len = IOBUF_SIZE - (header_ptr - header_buf) - 4;
1962 memcpy(header_ptr, iobuf, len);
1964 header_ptr[0] = '\r';
1965 header_ptr[1] = '\n';
1970 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1971 /* Try and do our best to parse more lines */
1972 if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
1973 /* extra read only for POST */
1974 if (prequest != request_GET
1975 #if ENABLE_FEATURE_HTTPD_CGI
1976 && prequest != request_HEAD
1979 tptr = skip_whitespace(iobuf + sizeof("Content-length:") - 1);
1981 send_headers_and_exit(HTTP_BAD_REQUEST);
1982 /* not using strtoul: it ignores leading minus! */
1983 length = bb_strtou(tptr, NULL, 10);
1984 /* length is "ulong", but we need to pass it to int later */
1985 if (errno || length > INT_MAX)
1986 send_headers_and_exit(HTTP_BAD_REQUEST);
1990 #if ENABLE_FEATURE_HTTPD_CGI
1991 else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
1992 cookie = xstrdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
1993 } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
1994 content_type = xstrdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
1995 } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
1996 referer = xstrdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
1997 } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
1998 user_agent = xstrdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
1999 } else if (STRNCASECMP(iobuf, "Host:") == 0) {
2000 host = xstrdup(skip_whitespace(iobuf + sizeof("Host:")-1));
2001 } else if (STRNCASECMP(iobuf, "Accept:") == 0) {
2002 http_accept = xstrdup(skip_whitespace(iobuf + sizeof("Accept:")-1));
2003 } else if (STRNCASECMP(iobuf, "Accept-Language:") == 0) {
2004 http_accept_language = xstrdup(skip_whitespace(iobuf + sizeof("Accept-Language:")-1));
2007 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2008 if (STRNCASECMP(iobuf, "Authorization:") == 0) {
2009 /* We only allow Basic credentials.
2010 * It shows up as "Authorization: Basic <user>:<passwd>" where
2011 * "<user>:<passwd>" is base64 encoded.
2013 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
2014 if (STRNCASECMP(tptr, "Basic") != 0)
2016 tptr += sizeof("Basic")-1;
2017 /* decodeBase64() skips whitespace itself */
2019 authorized = check_user_passwd(urlcopy, tptr);
2022 #if ENABLE_FEATURE_HTTPD_RANGES
2023 if (STRNCASECMP(iobuf, "Range:") == 0) {
2024 /* We know only bytes=NNN-[MMM] */
2025 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
2026 if (strncmp(s, "bytes=", 6) == 0) {
2027 s += sizeof("bytes=")-1;
2028 range_start = BB_STRTOOFF(s, &s, 10);
2029 if (s[0] != '-' || range_start < 0) {
2032 range_end = BB_STRTOOFF(s+1, NULL, 10);
2033 if (errno || range_end < range_start)
2039 } /* while extra header reading */
2042 /* We are done reading headers, disable peer timeout */
2045 if (strcmp(bb_basename(urlcopy), HTTPD_CONF) == 0 || !ip_allowed) {
2046 /* protect listing [/path]/httpd.conf or IP deny */
2047 send_headers_and_exit(HTTP_FORBIDDEN);
2050 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2051 /* Case: no "Authorization:" was seen, but page does require passwd.
2052 * Check that with dummy user:pass */
2054 authorized = check_user_passwd(urlcopy, ":");
2056 send_headers_and_exit(HTTP_UNAUTHORIZED);
2059 if (found_moved_temporarily) {
2060 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
2063 #if ENABLE_FEATURE_HTTPD_PROXY
2064 if (proxy_entry != NULL) {
2066 len_and_sockaddr *lsa;
2068 proxy_fd = socket(AF_INET, SOCK_STREAM, 0);
2070 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2071 lsa = host2sockaddr(proxy_entry->host_port, 80);
2073 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2074 if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0)
2075 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2076 fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n",
2077 prequest, /* GET or POST */
2078 proxy_entry->url_to, /* url part 1 */
2079 urlcopy + strlen(proxy_entry->url_from), /* url part 2 */
2080 (g_query ? "?" : ""), /* "?" (maybe) */
2081 (g_query ? g_query : ""), /* query string (maybe) */
2082 http_major_version, http_minor_version);
2083 header_ptr[0] = '\r';
2084 header_ptr[1] = '\n';
2086 write(proxy_fd, header_buf, header_ptr - header_buf);
2087 free(header_buf); /* on the order of 8k, free it */
2088 /* cgi_io_loop_and_exit needs to have two disctinct fds */
2089 cgi_io_loop_and_exit(proxy_fd, dup(proxy_fd), length);
2093 tptr = urlcopy + 1; /* skip first '/' */
2095 #if ENABLE_FEATURE_HTTPD_CGI
2096 if (strncmp(tptr, "cgi-bin/", 8) == 0) {
2097 if (tptr[8] == '\0') {
2098 /* protect listing "cgi-bin/" */
2099 send_headers_and_exit(HTTP_FORBIDDEN);
2101 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2103 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
2105 char *suffix = strrchr(tptr, '.');
2108 for (cur = script_i; cur; cur = cur->next) {
2109 if (strcmp(cur->before_colon + 1, suffix) == 0) {
2110 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2116 if (prequest != request_GET && prequest != request_HEAD) {
2117 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2119 #endif /* FEATURE_HTTPD_CGI */
2121 if (urlp[-1] == '/')
2122 strcpy(urlp, index_page);
2123 if (stat(tptr, &sb) == 0) {
2124 file_size = sb.st_size;
2125 last_mod = sb.st_mtime;
2127 #if ENABLE_FEATURE_HTTPD_CGI
2128 else if (urlp[-1] == '/') {
2129 /* It's a dir URL and there is no index.html
2130 * Try cgi-bin/index.cgi */
2131 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
2134 send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
2139 * fall through to send_file, it errors out if open fails
2143 send_file_and_exit(tptr,
2144 #if ENABLE_FEATURE_HTTPD_CGI
2145 (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS)
2147 SEND_HEADERS_AND_BODY
2153 * The main http server function.
2154 * Given a socket, listen for new connections and farm out
2155 * the processing as a [v]forked process.
2159 static void mini_httpd(int server_socket) NORETURN;
2160 static void mini_httpd(int server_socket)
2162 /* NB: it's best to not use xfuncs in this loop before fork().
2163 * Otherwise server may die on transient errors (temporary
2164 * out-of-memory condition, etc), which is Bad(tm).
2165 * Try to do any dangerous calls after fork.
2169 len_and_sockaddr fromAddr;
2171 /* Wait for connections... */
2172 fromAddr.len = LSA_SIZEOF_SA;
2173 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2177 /* set the KEEPALIVE option to cull dead connections */
2178 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2182 /* Do not reload config on HUP */
2183 signal(SIGHUP, SIG_IGN);
2184 close(server_socket);
2188 handle_incoming_and_exit(&fromAddr);
2190 /* parent, or fork failed */
2196 static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN;
2197 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2199 char *argv_copy[argc + 2];
2201 argv_copy[0] = argv[0];
2202 argv_copy[1] = (char*)"-i";
2203 memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2205 /* NB: it's best to not use xfuncs in this loop before vfork().
2206 * Otherwise server may die on transient errors (temporary
2207 * out-of-memory condition, etc), which is Bad(tm).
2208 * Try to do any dangerous calls after fork.
2212 len_and_sockaddr fromAddr;
2214 /* Wait for connections... */
2215 fromAddr.len = LSA_SIZEOF_SA;
2216 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2220 /* set the KEEPALIVE option to cull dead connections */
2221 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2225 /* Do not reload config on HUP */
2226 signal(SIGHUP, SIG_IGN);
2227 close(server_socket);
2231 /* Run a copy of ourself in inetd mode */
2234 /* parent, or vfork failed */
2242 * Process a HTTP connection on stdin/out.
2245 static void mini_httpd_inetd(void) NORETURN;
2246 static void mini_httpd_inetd(void)
2248 len_and_sockaddr fromAddr;
2250 memset(&fromAddr, 0, sizeof(fromAddr));
2251 fromAddr.len = LSA_SIZEOF_SA;
2252 /* NB: can fail if user runs it by hand and types in http cmds */
2253 getpeername(0, &fromAddr.u.sa, &fromAddr.len);
2254 handle_incoming_and_exit(&fromAddr);
2257 static void sighup_handler(int sig UNUSED_PARAM)
2259 parse_conf(DEFAULT_PATH_HTTPD_CONF, SIGNALED_PARSE);
2263 c_opt_config_file = 0,
2266 IF_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2267 IF_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,)
2268 IF_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,)
2269 IF_FEATURE_HTTPD_SETUID( u_opt_setuid ,)
2274 OPT_CONFIG_FILE = 1 << c_opt_config_file,
2275 OPT_DECODE_URL = 1 << d_opt_decode_url,
2276 OPT_HOME_HTTPD = 1 << h_opt_home_httpd,
2277 OPT_ENCODE_URL = IF_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2278 OPT_REALM = IF_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0,
2279 OPT_MD5 = IF_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0,
2280 OPT_SETUID = IF_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0,
2281 OPT_PORT = 1 << p_opt_port,
2282 OPT_INETD = 1 << p_opt_inetd,
2283 OPT_FOREGROUND = 1 << p_opt_foreground,
2284 OPT_VERBOSE = 1 << p_opt_verbose,
2288 int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2289 int httpd_main(int argc UNUSED_PARAM, char **argv)
2291 int server_socket = server_socket; /* for gcc */
2293 char *url_for_decode;
2294 IF_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2295 IF_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2296 IF_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2297 IF_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2301 #if ENABLE_LOCALE_SUPPORT
2302 /* Undo busybox.c: we want to speak English in http (dates etc) */
2303 setlocale(LC_TIME, "C");
2306 home_httpd = xrealloc_getcwd_or_warn(NULL);
2307 /* -v counts, -i implies -f */
2308 opt_complementary = "vv:if";
2309 /* We do not "absolutize" path given by -h (home) opt.
2310 * If user gives relative path in -h,
2311 * $SCRIPT_FILENAME will not be set. */
2312 opt = getopt32(argv, "c:d:h:"
2313 IF_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2314 IF_FEATURE_HTTPD_BASIC_AUTH("r:")
2315 IF_FEATURE_HTTPD_AUTH_MD5("m:")
2316 IF_FEATURE_HTTPD_SETUID("u:")
2318 &opt_c_configFile, &url_for_decode, &home_httpd
2319 IF_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2320 IF_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2321 IF_FEATURE_HTTPD_AUTH_MD5(, &pass)
2322 IF_FEATURE_HTTPD_SETUID(, &s_ugid)
2323 , &bind_addr_or_port
2326 if (opt & OPT_DECODE_URL) {
2327 fputs(decodeString(url_for_decode, 1), stdout);
2330 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2331 if (opt & OPT_ENCODE_URL) {
2332 fputs(encodeString(url_for_encode), stdout);
2336 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2337 if (opt & OPT_MD5) {
2338 puts(pw_encrypt(pass, "$1$", 1));
2342 #if ENABLE_FEATURE_HTTPD_SETUID
2343 if (opt & OPT_SETUID) {
2344 xget_uidgid(&ugid, s_ugid);
2349 if (!(opt & OPT_FOREGROUND)) {
2350 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2355 if (!(opt & OPT_INETD)) {
2356 signal(SIGCHLD, SIG_IGN);
2357 server_socket = openServer();
2358 #if ENABLE_FEATURE_HTTPD_SETUID
2359 /* drop privileges */
2360 if (opt & OPT_SETUID) {
2361 if (ugid.gid != (gid_t)-1) {
2362 if (setgroups(1, &ugid.gid) == -1)
2363 bb_perror_msg_and_die("setgroups");
2372 /* User can do it himself: 'env - PATH="$PATH" httpd'
2373 * We don't do it because we don't want to screw users
2375 * 'env - VAR1=val1 VAR2=val2 httpd'
2376 * and have VAR1 and VAR2 values visible in their CGIs.
2377 * Besides, it is also smaller. */
2379 char *p = getenv("PATH");
2380 /* env strings themself are not freed, no need to xstrdup(p): */
2384 // if (!(opt & OPT_INETD))
2385 // setenv_long("SERVER_PORT", ???);
2389 parse_conf(DEFAULT_PATH_HTTPD_CONF, FIRST_PARSE);
2390 if (!(opt & OPT_INETD))
2391 signal(SIGHUP, sighup_handler);
2393 xfunc_error_retval = 0;
2394 if (opt & OPT_INETD)
2397 if (!(opt & OPT_FOREGROUND))
2398 bb_daemonize(0); /* don't change current directory */
2399 mini_httpd(server_socket); /* never returns */
2401 mini_httpd_nommu(server_socket, argc, argv); /* never returns */