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 # running cgi.php scripts 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>
106 #define IOBUF_SIZE 8192 /* IO buffer */
108 /* amount of buffering in a pipe */
110 # define PIPE_BUF 4096
112 #if PIPE_BUF >= IOBUF_SIZE
113 # error "PIPE_BUF >= IOBUF_SIZE"
116 #define HEADER_READ_TIMEOUT 60
118 static const char default_path_httpd_conf[] ALIGN1 = "/etc";
119 static const char httpd_conf[] ALIGN1 = "httpd.conf";
120 static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
122 typedef struct has_next_ptr {
123 struct has_next_ptr *next;
126 /* Must have "next" as a first member */
127 typedef struct Htaccess {
128 struct Htaccess *next;
130 char before_colon[1]; /* really bigger, must be last */
133 /* Must have "next" as a first member */
134 typedef struct Htaccess_IP {
135 struct Htaccess_IP *next;
141 /* Must have "next" as a first member */
142 typedef struct Htaccess_Proxy {
143 struct Htaccess_Proxy *next;
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,
161 #if 0 /* future use */
162 HTTP_SWITCHING_PROTOCOLS = 101,
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
177 static const uint16_t http_response_type[] ALIGN2 = {
179 #if ENABLE_FEATURE_HTTPD_RANGES
180 HTTP_PARTIAL_CONTENT,
182 HTTP_MOVED_TEMPORARILY,
183 HTTP_REQUEST_TIMEOUT,
184 HTTP_NOT_IMPLEMENTED,
185 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
191 HTTP_INTERNAL_SERVER_ERROR,
192 #if 0 /* not implemented */
196 HTTP_MULTIPLE_CHOICES,
197 HTTP_MOVED_PERMANENTLY,
200 HTTP_SERVICE_UNAVAILABLE,
204 static const struct {
207 } http_response[ARRAY_SIZE(http_response_type)] = {
209 #if ENABLE_FEATURE_HTTPD_RANGES
210 { "Partial Content", 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", "" },
218 { "Not Found", "The requested URL was not found" },
219 { "Bad Request", "Unsupported method" },
221 { "Internal Server Error", "Internal Server Error" },
222 #if 0 /* not implemented */
226 { "Multiple Choices" },
227 { "Moved Permanently" },
229 { "Bad Gateway", "" },
230 { "Service Unavailable", "" },
236 int verbose; /* must be int (used by getopt32) */
237 smallint flg_deny_all;
239 unsigned rmt_ip; /* used for IP-based allow/deny rules */
241 char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */
242 const char *bind_addr_or_port;
245 const char *configFile;
246 const char *home_httpd;
247 const char *index_page;
249 const char *found_mime_type;
250 const char *found_moved_temporarily;
251 Htaccess_IP *ip_a_d; /* config allow/deny lines */
253 IF_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
254 IF_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
255 IF_FEATURE_HTTPD_CGI(char *referer;)
256 IF_FEATURE_HTTPD_CGI(char *user_agent;)
257 IF_FEATURE_HTTPD_CGI(char *host;)
258 IF_FEATURE_HTTPD_CGI(char *http_accept;)
259 IF_FEATURE_HTTPD_CGI(char *http_accept_language;)
261 off_t file_size; /* -1 - unknown */
262 #if ENABLE_FEATURE_HTTPD_RANGES
268 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
269 Htaccess *g_auth; /* config user:password lines */
271 Htaccess *mime_a; /* config mime types */
272 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
273 Htaccess *script_i; /* config script interpreters */
275 char *iobuf; /* [IOBUF_SIZE] */
276 #define hdr_buf bb_common_bufsiz1
279 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
280 const char *http_error_page[ARRAY_SIZE(http_response_type)];
282 #if ENABLE_FEATURE_HTTPD_PROXY
283 Htaccess_Proxy *proxy;
286 #define G (*ptr_to_globals)
287 #define verbose (G.verbose )
288 #define flg_deny_all (G.flg_deny_all )
289 #define rmt_ip (G.rmt_ip )
290 #define bind_addr_or_port (G.bind_addr_or_port)
291 #define g_query (G.g_query )
292 #define configFile (G.configFile )
293 #define home_httpd (G.home_httpd )
294 #define index_page (G.index_page )
295 #define found_mime_type (G.found_mime_type )
296 #define found_moved_temporarily (G.found_moved_temporarily)
297 #define last_mod (G.last_mod )
298 #define ip_a_d (G.ip_a_d )
299 #define g_realm (G.g_realm )
300 #define remoteuser (G.remoteuser )
301 #define referer (G.referer )
302 #define user_agent (G.user_agent )
303 #define host (G.host )
304 #define http_accept (G.http_accept )
305 #define http_accept_language (G.http_accept_language)
306 #define file_size (G.file_size )
307 #if ENABLE_FEATURE_HTTPD_RANGES
308 #define range_start (G.range_start )
309 #define range_end (G.range_end )
310 #define range_len (G.range_len )
314 range_end = MAXINT(off_t) - 1,
315 range_len = MAXINT(off_t),
318 #define rmt_ip_str (G.rmt_ip_str )
319 #define g_auth (G.g_auth )
320 #define mime_a (G.mime_a )
321 #define script_i (G.script_i )
322 #define iobuf (G.iobuf )
323 #define hdr_ptr (G.hdr_ptr )
324 #define hdr_cnt (G.hdr_cnt )
325 #define http_error_page (G.http_error_page )
326 #define proxy (G.proxy )
327 #define INIT_G() do { \
328 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
329 IF_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
330 bind_addr_or_port = "80"; \
331 index_page = "index.html"; \
336 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
340 SEND_HEADERS = (1 << 0),
341 SEND_BODY = (1 << 1),
342 SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY,
344 static void send_file_and_exit(const char *url, int what) NORETURN;
346 static void free_llist(has_next_ptr **pptr)
348 has_next_ptr *cur = *pptr;
350 has_next_ptr *t = cur;
357 static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
359 free_llist((has_next_ptr**)pptr);
362 static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
364 free_llist((has_next_ptr**)pptr);
367 /* Returns presumed mask width in bits or < 0 on error.
368 * Updates strp, stores IP at provided pointer */
369 static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
371 const char *p = *strp;
379 for (j = 0; j < 4; j++) {
382 if ((*p < '0' || *p > '9') && *p != '/' && *p)
385 while (*p >= '0' && *p <= '9') {
396 ip = (ip << 8) | octet;
410 /* Returns 0 on success. Stores IP and mask at provided pointers */
411 static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
417 i = scan_ip(&str, ipp, '/');
422 /* there is /xxx after dotted-IP address */
423 i = bb_strtou(str, &p, 10);
425 /* 'xxx' itself is dotted-IP mask, parse it */
426 /* (return 0 (success) only if it has N.N.N.N form) */
427 return scan_ip(&str, maskp, '\0') - 32;
436 if (sizeof(unsigned) == 4 && i == 32) {
437 /* mask >>= 32 below may not work */
443 /* i == 0 -> *maskp = 0x00000000
444 * i == 1 -> *maskp = 0x80000000
445 * i == 4 -> *maskp = 0xf0000000
446 * i == 31 -> *maskp = 0xfffffffe
447 * i == 32 -> *maskp = 0xffffffff */
448 *maskp = (uint32_t)(~mask);
453 * Parse configuration file into in-memory linked list.
455 * The first non-white character is examined to determine if the config line
456 * is one of the following:
457 * .ext:mime/type # new mime type not compiled into httpd
458 * [adAD]:from # ip address allow/deny, * for wildcard
459 * /path:user:pass # username/password
460 * Ennn:error.html # error page for status nnn
461 * P:/url:[http://]hostname[:port]/new/path # reverse proxy
463 * Any previous IP rules are discarded.
464 * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
465 * are also discarded. That is, previous settings are retained if flag is
467 * Error pages are only parsed on the main config file.
469 * path Path where to look for httpd.conf (without filename).
470 * flag Type of the parse request.
473 #define FIRST_PARSE 0
474 #define SUBDIR_PARSE 1
475 #define SIGNALED_PARSE 2
476 #define FIND_FROM_HTTPD_ROOT 3
477 static void parse_conf(const char *path, int flag)
480 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
484 const char *filename = configFile;
490 /* discard old rules */
491 free_Htaccess_IP_list(&ip_a_d);
493 /* retain previous auth and mime config only for subdir parse */
494 if (flag != SUBDIR_PARSE) {
495 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
496 free_Htaccess_list(&g_auth);
498 free_Htaccess_list(&mime_a);
499 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
500 free_Htaccess_list(&script_i);
504 if (flag == SUBDIR_PARSE || filename == NULL) {
505 filename = alloca(strlen(path) + sizeof(httpd_conf) + 2);
506 sprintf((char *)filename, "%s/%s", path, httpd_conf);
509 while ((f = fopen_for_read(filename)) == NULL) {
510 if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
511 /* config file not found, no changes to config */
514 if (configFile && flag == FIRST_PARSE) /* if -c option given */
515 bb_simple_perror_msg_and_die(filename);
516 flag = FIND_FROM_HTTPD_ROOT;
517 filename = httpd_conf;
520 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
523 /* This could stand some work */
524 while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
526 for (p = p0; *p0 != '\0' && *p0 != '#'; p0++) {
529 if (*p0 == ':' && after_colon == NULL)
535 /* test for empty or strange line */
536 if (after_colon == NULL || *after_colon == '\0')
539 if (*p0 == 'd' || *p0 == 'a')
540 *p0 -= 0x20; /* a/d -> A/D */
541 if (*after_colon == '*') {
543 /* memorize "deny all" */
546 /* skip assumed "A:*", it is a default anyway */
550 if (*p0 == 'A' || *p0 == 'D') {
551 /* storing current config IP line */
552 pip = xzalloc(sizeof(Htaccess_IP));
553 if (scan_ip_mask(after_colon, &(pip->ip), &(pip->mask))) {
554 /* IP{/mask} syntax error detected, protect all */
558 pip->allow_deny = *p0;
560 /* Deny:from_IP - prepend */
564 /* A:from_IP - append (thus D precedes A) */
565 Htaccess_IP *prev_IP = ip_a_d;
566 if (prev_IP == NULL) {
569 while (prev_IP->next)
570 prev_IP = prev_IP->next;
577 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
578 if (flag == FIRST_PARSE && *p0 == 'E') {
580 int status = atoi(++p0); /* error status code */
581 if (status < HTTP_CONTINUE) {
582 bb_error_msg("config error '%s' in '%s'", buf, filename);
585 /* then error page; find matching status */
586 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
587 if (http_response_type[i] == status) {
588 /* We chdir to home_httpd, thus no need to
589 * concat_path_file(home_httpd, after_colon)
591 http_error_page[i] = xstrdup(after_colon);
599 #if ENABLE_FEATURE_HTTPD_PROXY
600 if (flag == FIRST_PARSE && *p0 == 'P') {
601 /* P:/url:[http://]hostname[:port]/new/path */
602 char *url_from, *host_port, *url_to;
603 Htaccess_Proxy *proxy_entry;
605 url_from = after_colon;
606 host_port = strchr(after_colon, ':');
607 if (host_port == NULL) {
608 bb_error_msg("config error '%s' in '%s'", buf, filename);
612 if (strncmp(host_port, "http://", 7) == 0)
614 if (*host_port == '\0') {
615 bb_error_msg("config error '%s' in '%s'", buf, filename);
618 url_to = strchr(host_port, '/');
619 if (url_to == NULL) {
620 bb_error_msg("config error '%s' in '%s'", buf, filename);
624 proxy_entry = xzalloc(sizeof(Htaccess_Proxy));
625 proxy_entry->url_from = xstrdup(url_from);
626 proxy_entry->host_port = xstrdup(host_port);
628 proxy_entry->url_to = xstrdup(url_to);
629 proxy_entry->next = proxy;
635 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
637 /* make full path from httpd root / current_path / config_line_path */
638 const char *tp = (flag == SUBDIR_PARSE ? path : "");
639 p0 = xmalloc(strlen(tp) + (after_colon - buf) + 2 + strlen(after_colon));
640 after_colon[-1] = '\0';
641 sprintf(p0, "/%s%s", tp, buf);
643 /* looks like bb_simplify_path... */
647 if (*tp == '/') { /* skip duplicate (or initial) slash */
651 if (tp[1] == '/' || tp[1] == '\0') { /* remove extra '.' */
654 if ((tp[1] == '.') && (tp[2] == '/' || tp[2] == '\0')) {
657 while (*--p != '/') /* omit previous dir */
667 if ((p == p0) || (*p != '/')) { /* not a trailing slash */
668 ++p; /* so keep last character */
671 strcpy(p + 1, after_colon);
675 index_page = xstrdup(after_colon);
679 /* Do not allow jumping around using H in subdir's configs */
680 if (flag == FIRST_PARSE && *p0 == 'H') {
681 home_httpd = xstrdup(after_colon);
686 /* storing current config line */
687 cur = xzalloc(sizeof(Htaccess) + strlen(p0));
688 strcpy(cur->before_colon, p0);
689 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
690 if (*p0 == '/') /* was malloced - see above */
693 cur->after_colon = strchr(cur->before_colon, ':');
694 *cur->after_colon++ = '\0';
695 if (cur->before_colon[0] == '.') {
696 /* .mime line: prepend to mime_a list */
701 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
702 if (cur->before_colon[0] == '*' && cur->before_colon[1] == '.') {
703 /* script interpreter line: prepend to script_i list */
704 cur->next = script_i;
709 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
710 //TODO: we do not test for leading "/"??
711 //also, do we leak cur if BASIC_AUTH is off?
716 /* sort path, if current length eq or bigger then move up */
717 Htaccess *prev_hti = g_auth;
718 size_t l = strlen(cur->before_colon);
721 for (hti = prev_hti; hti; hti = hti->next) {
722 if (l >= strlen(hti->before_colon)) {
723 /* insert before hti */
725 if (prev_hti != hti) {
726 prev_hti->next = cur;
734 prev_hti = prev_hti->next;
736 if (!hti) { /* not inserted, add to bottom */
741 #endif /* BASIC_AUTH */
742 } /* while (fgets) */
746 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
748 * Given a string, html-encode special characters.
749 * This is used for the -e command line option to provide an easy way
750 * for scripts to encode result data without confusing browsers. The
751 * returned string pointer is memory allocated by malloc().
753 * Returns a pointer to the encoded string (malloced).
755 static char *encodeString(const char *string)
757 /* take the simple route and encode everything */
758 /* could possibly scan once to get length. */
759 int len = strlen(string);
760 char *out = xmalloc(len * 6 + 1);
764 while ((ch = *string++)) {
765 /* very simple check for what to encode */
769 p += sprintf(p, "&#%d;", (unsigned char) ch);
774 #endif /* FEATURE_HTTPD_ENCODE_URL_STR */
777 * Given a URL encoded string, convert it to plain ascii.
778 * Since decoding always makes strings smaller, the decode is done in-place.
779 * Thus, callers should xstrdup() the argument if they do not want the
780 * argument modified. The return is the original pointer, allowing this
781 * function to be easily used as arguments to other functions.
783 * string The first string to decode.
784 * option_d 1 if called for httpd -d
786 * Returns a pointer to the decoded string (same as input).
788 static unsigned hex_to_bin(unsigned char c)
795 /* c | 0x20: letters to lower case, non-letters
796 * to (potentially different) non-letters */
797 v = (unsigned)(c | 0x20) - 'a';
803 void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
804 int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
805 t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
807 static char *decodeString(char *orig, int option_d)
809 /* note that decoded string is always shorter than original */
814 while ((c = *ptr++) != '\0') {
817 if (option_d && c == '+') {
825 v = hex_to_bin(ptr[0]);
833 v = (v * 16) | hex_to_bin(ptr[1]);
836 if (!option_d && (v == '/' || v == '\0')) {
837 /* caller takes it as indication of invalid
838 * (dangerous wrt exploits) chars */
848 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
850 * Decode a base64 data stream as per rfc1521.
851 * Note that the rfc states that non base64 chars are to be ignored.
852 * Since the decode always results in a shorter size than the input,
853 * it is OK to pass the input arg as an output arg.
854 * Parameter: a pointer to a base64 encoded string.
855 * Decoded data is stored in-place.
857 static void decodeBase64(char *Data)
859 const unsigned char *in = (const unsigned char *)Data;
860 /* The decoded size will be at most 3/4 the size of the encoded */
867 if (t >= '0' && t <= '9')
869 else if (t >= 'A' && t <= 'Z')
871 else if (t >= 'a' && t <= 'z')
885 *Data++ = (char) (ch >> 16);
886 *Data++ = (char) (ch >> 8);
896 * Create a listen server socket on the designated port.
898 static int openServer(void)
900 unsigned n = bb_strtou(bind_addr_or_port, NULL, 10);
901 if (!errno && n && n <= 0xffff)
902 n = create_and_bind_stream_or_die(NULL, n);
904 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
910 * Log the connection closure and exit.
912 static void log_and_exit(void) NORETURN;
913 static void log_and_exit(void)
915 /* Paranoia. IE said to be buggy. It may send some extra data
916 * or be confused by us just exiting without SHUT_WR. Oh well. */
917 shutdown(1, SHUT_WR);
919 (this also messes up stdin when user runs httpd -i from terminal)
921 while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0)
926 bb_error_msg("closed");
927 _exit(xfunc_error_retval);
931 * Create and send HTTP response headers.
932 * The arguments are combined and sent as one write operation. Note that
933 * IE will puke big-time if the headers are not sent in one packet and the
934 * second packet is delayed for any reason.
935 * responseNum - the result code to send.
937 static void send_headers(int responseNum)
939 static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
941 const char *responseString = "";
942 const char *infoString = NULL;
943 const char *mime_type;
944 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
945 const char *error_page = NULL;
948 time_t timer = time(NULL);
952 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
953 if (http_response_type[i] == responseNum) {
954 responseString = http_response[i].name;
955 infoString = http_response[i].info;
956 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
957 error_page = http_error_page[i];
962 /* error message is HTML */
963 mime_type = responseNum == HTTP_OK ?
964 found_mime_type : "text/html";
967 bb_error_msg("response:%u", responseNum);
969 /* emit the current date */
970 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
972 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
973 "Date: %s\r\nConnection: close\r\n",
974 responseNum, responseString, mime_type, tmp_str);
976 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
977 if (responseNum == HTTP_UNAUTHORIZED) {
978 len += sprintf(iobuf + len,
979 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
983 if (responseNum == HTTP_MOVED_TEMPORARILY) {
984 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
985 found_moved_temporarily,
986 (g_query ? "?" : ""),
987 (g_query ? g_query : ""));
990 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
991 if (error_page && access(error_page, R_OK) == 0) {
992 strcat(iobuf, "\r\n");
996 fprintf(stderr, "headers: '%s'\n", iobuf);
997 full_write(STDOUT_FILENO, iobuf, len);
999 fprintf(stderr, "writing error page: '%s'\n", error_page);
1000 return send_file_and_exit(error_page, SEND_BODY);
1004 if (file_size != -1) { /* file */
1005 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
1006 #if ENABLE_FEATURE_HTTPD_RANGES
1007 if (responseNum == HTTP_PARTIAL_CONTENT) {
1008 len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n",
1012 file_size = range_end - range_start + 1;
1015 len += sprintf(iobuf + len,
1016 #if ENABLE_FEATURE_HTTPD_RANGES
1017 "Accept-Ranges: bytes\r\n"
1019 "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
1025 iobuf[len++] = '\r';
1026 iobuf[len++] = '\n';
1028 len += sprintf(iobuf + len,
1029 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
1030 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
1031 responseNum, responseString,
1032 responseNum, responseString, infoString);
1035 fprintf(stderr, "headers: '%s'\n", iobuf);
1036 if (full_write(STDOUT_FILENO, iobuf, len) != len) {
1038 bb_perror_msg("error");
1043 static void send_headers_and_exit(int responseNum) NORETURN;
1044 static void send_headers_and_exit(int responseNum)
1046 send_headers(responseNum);
1051 * Read from the socket until '\n' or EOF. '\r' chars are removed.
1052 * '\n' is replaced with NUL.
1053 * Return number of characters read or 0 if nothing is read
1054 * ('\r' and '\n' are not counted).
1055 * Data is returned in iobuf.
1057 static int get_line(void)
1062 alarm(HEADER_READ_TIMEOUT);
1065 hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1070 iobuf[count] = c = *hdr_ptr++;
1076 iobuf[count] = '\0';
1079 if (count < (IOBUF_SIZE - 1)) /* check overflow */
1085 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1087 /* gcc 4.2.1 fares better with NOINLINE */
1088 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN;
1089 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1091 enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1092 struct pollfd pfd[3];
1093 int out_cnt; /* we buffer a bit of initial CGI output */
1096 /* iobuf is used for CGI -> network data,
1097 * hdr_buf is for network -> CGI data (POSTDATA) */
1099 /* If CGI dies, we still want to correctly finish reading its output
1100 * and send it to the peer. So please no SIGPIPEs! */
1101 signal(SIGPIPE, SIG_IGN);
1103 // We inconsistently handle a case when more POSTDATA from network
1104 // is coming than we expected. We may give *some part* of that
1105 // extra data to CGI.
1107 //if (hdr_cnt > post_len) {
1108 // /* We got more POSTDATA from network than we expected */
1109 // hdr_cnt = post_len;
1111 post_len -= hdr_cnt;
1112 /* post_len - number of POST bytes not yet read from network */
1114 /* NB: breaking out of this loop jumps to log_and_exit() */
1117 memset(pfd, 0, sizeof(pfd));
1119 pfd[FROM_CGI].fd = fromCgi_rd;
1120 pfd[FROM_CGI].events = POLLIN;
1123 pfd[TO_CGI].fd = toCgi_wr;
1125 pfd[TO_CGI].events = POLLOUT;
1126 } else if (post_len > 0) {
1127 pfd[0].events = POLLIN;
1129 /* post_len <= 0 && hdr_cnt <= 0:
1130 * no more POST data to CGI,
1131 * let CGI see EOF on CGI's stdin */
1137 /* Now wait on the set of sockets */
1138 count = safe_poll(pfd, 3, -1);
1141 if (safe_waitpid(pid, &status, WNOHANG) <= 0) {
1142 /* Weird. CGI didn't exit and no fd's
1143 * are ready, yet poll returned?! */
1146 if (DEBUG && WIFEXITED(status))
1147 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1148 if (DEBUG && WIFSIGNALED(status))
1149 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1154 if (pfd[TO_CGI].revents) {
1155 /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */
1156 /* Have data from peer and can write to CGI */
1157 count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1158 /* Doesn't happen, we dont use nonblocking IO here
1159 *if (count < 0 && errno == EAGAIN) {
1166 /* EOF/broken pipe to CGI, stop piping POST data */
1167 hdr_cnt = post_len = 0;
1171 if (pfd[0].revents) {
1172 /* post_len > 0 && hdr_cnt == 0 here */
1173 /* We expect data, prev data portion is eaten by CGI
1174 * and there *is* data to read from the peer
1176 //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
1177 //count = safe_read(STDIN_FILENO, hdr_buf, count);
1178 count = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1184 /* no more POST data can be read */
1189 if (pfd[FROM_CGI].revents) {
1190 /* There is something to read from CGI */
1193 /* Are we still buffering CGI output? */
1195 /* HTTP_200[] has single "\r\n" at the end.
1196 * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1197 * CGI scripts MUST send their own header terminated by
1198 * empty line, then data. That's why we have only one
1199 * <cr><lf> pair here. We will output "200 OK" line
1200 * if needed, but CGI still has to provide blank line
1201 * between header and body */
1203 /* Must use safe_read, not full_read, because
1204 * CGI may output a few first bytes and then wait
1205 * for POSTDATA without closing stdout.
1206 * With full_read we may wait here forever. */
1207 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1209 /* eof (or error) and there was no "HTTP",
1210 * so write it, then write received data */
1212 full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1);
1213 full_write(STDOUT_FILENO, rbuf, out_cnt);
1215 break; /* CGI stdout is closed, exiting */
1219 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1220 if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1221 /* send "HTTP/1.0 " */
1222 if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9)
1224 rbuf += 8; /* skip "Status: " */
1225 count = out_cnt - 8;
1226 out_cnt = -1; /* buffering off */
1227 } else if (out_cnt >= 4) {
1228 /* Did CGI add "HTTP"? */
1229 if (memcmp(rbuf, HTTP_200, 4) != 0) {
1230 /* there is no "HTTP", do it ourself */
1231 if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1235 if (!strstr(rbuf, "ontent-")) {
1236 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1238 * Counter-example of valid CGI without Content-type:
1239 * echo -en "HTTP/1.0 302 Found\r\n"
1240 * echo -en "Location: http://www.busybox.net\r\n"
1244 out_cnt = -1; /* buffering off */
1247 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1249 break; /* eof (or error) */
1251 if (full_write(STDOUT_FILENO, rbuf, count) != count)
1254 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1255 } /* if (pfd[FROM_CGI].revents) */
1261 #if ENABLE_FEATURE_HTTPD_CGI
1263 static void setenv1(const char *name, const char *value)
1265 setenv(name, value ? value : "", 1);
1269 * Spawn CGI script, forward CGI's stdin/out <=> network
1271 * Environment variables are set up and the script is invoked with pipes
1272 * for stdin/stdout. If a POST is being done the script is fed the POST
1273 * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1276 * const char *url The requested URL (with leading /).
1277 * int post_len Length of the POST body.
1278 * const char *cookie For set HTTP_COOKIE.
1279 * const char *content_type For set CONTENT_TYPE.
1281 static void send_cgi_and_exit(
1283 const char *request,
1286 const char *content_type) NORETURN;
1287 static void send_cgi_and_exit(
1289 const char *request,
1292 const char *content_type)
1294 struct fd_pair fromCgi; /* CGI -> httpd pipe */
1295 struct fd_pair toCgi; /* httpd -> CGI pipe */
1299 /* Make a copy. NB: caller guarantees:
1300 * url[0] == '/', url[1] != '/' */
1304 * We are mucking with environment _first_ and then vfork/exec,
1305 * this allows us to use vfork safely. Parent doesn't care about
1306 * these environment changes anyway.
1309 /* Check for [dirs/]script.cgi/PATH_INFO */
1310 script = (char*)url;
1311 while ((script = strchr(script + 1, '/')) != NULL) {
1315 if (!is_directory(url + 1, 1, &sb)) {
1316 /* not directory, found script.cgi/PATH_INFO */
1320 *script = '/'; /* is directory, find next '/' */
1322 setenv1("PATH_INFO", script); /* set to /PATH_INFO or "" */
1323 setenv1("REQUEST_METHOD", request);
1325 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", url, g_query));
1327 setenv1("REQUEST_URI", url);
1330 *script = '\0'; /* cut off /PATH_INFO */
1332 /* SCRIPT_FILENAME is required by PHP in CGI mode */
1333 if (home_httpd[0] == '/') {
1334 char *fullpath = concat_path_file(home_httpd, url);
1335 setenv1("SCRIPT_FILENAME", fullpath);
1337 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1338 setenv1("SCRIPT_NAME", url);
1339 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1340 * QUERY_STRING: The information which follows the ? in the URL
1341 * which referenced this script. This is the query information.
1342 * It should not be decoded in any fashion. This variable
1343 * should always be set when there is query information,
1344 * regardless of command line decoding. */
1345 /* (Older versions of bbox seem to do some decoding) */
1346 setenv1("QUERY_STRING", g_query);
1347 putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1348 putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1349 putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1350 /* Having _separate_ variables for IP and port defeats
1351 * the purpose of having socket abstraction. Which "port"
1352 * are you using on Unix domain socket?
1353 * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1356 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1357 char *cp = strrchr(p, ':');
1358 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1360 if (cp) *cp = '\0'; /* delete :PORT */
1361 setenv1("REMOTE_ADDR", p);
1364 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1365 setenv1("REMOTE_PORT", cp + 1);
1369 setenv1("HTTP_USER_AGENT", user_agent);
1371 setenv1("HTTP_ACCEPT", http_accept);
1372 if (http_accept_language)
1373 setenv1("HTTP_ACCEPT_LANGUAGE", http_accept_language);
1375 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1377 setenv1("HTTP_COOKIE", cookie);
1379 setenv1("CONTENT_TYPE", content_type);
1380 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1382 setenv1("REMOTE_USER", remoteuser);
1383 putenv((char*)"AUTH_TYPE=Basic");
1387 setenv1("HTTP_REFERER", referer);
1388 setenv1("HTTP_HOST", host); /* set to "" if NULL */
1389 /* setenv1("SERVER_NAME", safe_gethostname()); - don't do this,
1390 * just run "env SERVER_NAME=xyz httpd ..." instead */
1392 xpiped_pair(fromCgi);
1397 /* TODO: log perror? */
1405 xfunc_error_retval = 242;
1407 /* NB: close _first_, then move fds! */
1410 xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */
1411 xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */
1412 /* User seeing stderr output can be a security problem.
1413 * If CGI really wants that, it can always do dup itself. */
1416 /* Chdiring to script's dir */
1417 script = strrchr(url, '/');
1418 if (script != url) { /* paranoia */
1420 if (chdir(url + 1) != 0) {
1421 bb_perror_msg("chdir %s", url + 1);
1422 goto error_execing_cgi;
1424 // not needed: *script = '/';
1428 /* set argv[0] to name without path */
1432 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1434 char *suffix = strrchr(script, '.');
1438 for (cur = script_i; cur; cur = cur->next) {
1439 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1440 /* found interpreter name */
1441 argv[0] = cur->after_colon;
1450 /* restore default signal dispositions for CGI process */
1457 /* _NOT_ execvp. We do not search PATH. argv[0] is a filename
1458 * without any dir components and will only match a file
1459 * in the current directory */
1460 execv(argv[0], argv);
1462 bb_perror_msg("exec %s", argv[0]);
1465 * (we are CGI here, our stdout is pumped to the net) */
1466 send_headers_and_exit(HTTP_NOT_FOUND);
1469 /* Parent process */
1471 /* Restore variables possibly changed by child */
1472 xfunc_error_retval = 0;
1477 cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1480 #endif /* FEATURE_HTTPD_CGI */
1483 * Send a file response to a HTTP request, and exit
1486 * const char *url The requested URL (with leading /).
1487 * what What to send (headers/body/both).
1489 static NOINLINE void send_file_and_exit(const char *url, int what)
1491 static const char *const suffixTable[] = {
1492 /* Warning: shorter equivalent suffix in one line must be first */
1493 ".htm.html", "text/html",
1494 ".jpg.jpeg", "image/jpeg",
1495 ".gif", "image/gif",
1496 ".png", "image/png",
1497 ".txt.h.c.cc.cpp", "text/plain",
1499 ".wav", "audio/wav",
1500 ".avi", "video/x-msvideo",
1501 ".qt.mov", "video/quicktime",
1502 ".mpe.mpeg", "video/mpeg",
1503 ".mid.midi", "audio/midi",
1504 ".mp3", "audio/mpeg",
1505 #if 0 /* unpopular */
1506 ".au", "audio/basic",
1507 ".pac", "application/x-ns-proxy-autoconfig",
1508 ".vrml.wrl", "model/vrml",
1515 const char *const *table;
1516 const char *try_suffix;
1519 fd = open(url, O_RDONLY);
1522 bb_perror_msg("can't open '%s'", url);
1523 /* Error pages are sent by using send_file_and_exit(SEND_BODY).
1524 * IOW: it is unsafe to call send_headers_and_exit
1525 * if what is SEND_BODY! Can recurse! */
1526 if (what != SEND_BODY)
1527 send_headers_and_exit(HTTP_NOT_FOUND);
1532 bb_error_msg("sending file '%s' content-type: %s",
1533 url, found_mime_type);
1535 /* If you want to know about EPIPE below
1536 * (happens if you abort downloads from local httpd): */
1537 signal(SIGPIPE, SIG_IGN);
1539 suffix = strrchr(url, '.');
1541 /* If not found, set default as "application/octet-stream"; */
1542 found_mime_type = "application/octet-stream";
1545 for (table = suffixTable; *table; table += 2) {
1546 try_suffix = strstr(table[0], suffix);
1548 try_suffix += strlen(suffix);
1549 if (*try_suffix == '\0' || *try_suffix == '.') {
1550 found_mime_type = table[1];
1555 for (cur = mime_a; cur; cur = cur->next) {
1556 if (strcmp(cur->before_colon, suffix) == 0) {
1557 found_mime_type = cur->after_colon;
1562 #if ENABLE_FEATURE_HTTPD_RANGES
1563 if (what == SEND_BODY)
1564 range_start = 0; /* err pages and ranges don't mix */
1565 range_len = MAXINT(off_t);
1568 range_end = file_size - 1;
1570 if (range_end < range_start
1571 || lseek(fd, range_start, SEEK_SET) != range_start
1573 lseek(fd, 0, SEEK_SET);
1576 range_len = range_end - range_start + 1;
1577 send_headers(HTTP_PARTIAL_CONTENT);
1582 if (what & SEND_HEADERS)
1583 send_headers(HTTP_OK);
1584 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1586 off_t offset = range_start;
1588 /* sz is rounded down to 64k */
1589 ssize_t sz = MAXINT(ssize_t) - 0xffff;
1590 IF_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1591 count = sendfile(STDOUT_FILENO, fd, &offset, sz);
1593 if (offset == range_start)
1594 break; /* fall back to read/write loop */
1597 IF_FEATURE_HTTPD_RANGES(range_len -= sz;)
1598 if (count == 0 || range_len == 0)
1603 while ((count = safe_read(fd, iobuf, IOBUF_SIZE)) > 0) {
1605 IF_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1606 n = full_write(STDOUT_FILENO, iobuf, count);
1609 IF_FEATURE_HTTPD_RANGES(range_len -= count;)
1614 IF_FEATURE_HTTPD_USE_SENDFILE(fin:)
1616 bb_perror_msg("error");
1621 static int checkPermIP(void)
1625 for (cur = ip_a_d; cur; cur = cur->next) {
1628 "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1630 (unsigned char)(cur->ip >> 24),
1631 (unsigned char)(cur->ip >> 16),
1632 (unsigned char)(cur->ip >> 8),
1633 (unsigned char)(cur->ip),
1634 (unsigned char)(cur->mask >> 24),
1635 (unsigned char)(cur->mask >> 16),
1636 (unsigned char)(cur->mask >> 8),
1637 (unsigned char)(cur->mask)
1640 if ((rmt_ip & cur->mask) == cur->ip)
1641 return (cur->allow_deny == 'A'); /* A -> 1 */
1644 return !flg_deny_all; /* depends on whether we saw "D:*" */
1647 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1649 * Config file entries are of the form "/<path>:<user>:<passwd>".
1650 * If config file has no prefix match for path, access is allowed.
1652 * path The file path
1653 * user_and_passwd "user:passwd" to validate
1655 * Returns 1 if user_and_passwd is OK.
1657 static int check_user_passwd(const char *path, const char *user_and_passwd)
1660 const char *prev = NULL;
1662 for (cur = g_auth; cur; cur = cur->next) {
1663 const char *dir_prefix;
1666 dir_prefix = cur->before_colon;
1669 /* If already saw a match, don't accept other different matches */
1670 if (prev && strcmp(prev, dir_prefix) != 0)
1674 fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd);
1676 /* If it's not a prefix match, continue searching */
1677 len = strlen(dir_prefix);
1678 if (len != 1 /* dir_prefix "/" matches all, don't need to check */
1679 && (strncmp(dir_prefix, path, len) != 0
1680 || (path[len] != '/' && path[len] != '\0'))
1685 /* Path match found */
1688 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1691 md5_passwd = strchr(cur->after_colon, ':');
1692 if (md5_passwd && md5_passwd[1] == '$' && md5_passwd[2] == '1'
1693 && md5_passwd[3] == '$' && md5_passwd[4]
1699 user_len_p1 = md5_passwd - cur->after_colon;
1700 /* comparing "user:" */
1701 if (strncmp(cur->after_colon, user_and_passwd, user_len_p1) != 0) {
1705 encrypted = pw_encrypt(
1706 user_and_passwd + user_len_p1 /* cleartext pwd from user */,
1707 md5_passwd /*salt */, 1 /* cleanup */);
1708 r = strcmp(encrypted, md5_passwd);
1711 goto set_remoteuser_var; /* Ok */
1716 /* Comparing plaintext "user:pass" in one go */
1717 if (strcmp(cur->after_colon, user_and_passwd) == 0) {
1719 remoteuser = xstrndup(user_and_passwd,
1720 strchrnul(user_and_passwd, ':') - user_and_passwd);
1725 /* 0(bad) if prev is set: matches were found but passwd was wrong */
1726 return (prev == NULL);
1728 #endif /* FEATURE_HTTPD_BASIC_AUTH */
1730 #if ENABLE_FEATURE_HTTPD_PROXY
1731 static Htaccess_Proxy *find_proxy_entry(const char *url)
1734 for (p = proxy; p; p = p->next) {
1735 if (strncmp(url, p->url_from, strlen(p->url_from)) == 0)
1745 static void send_REQUEST_TIMEOUT_and_exit(int sig) NORETURN;
1746 static void send_REQUEST_TIMEOUT_and_exit(int sig UNUSED_PARAM)
1748 send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1752 * Handle an incoming http request and exit.
1754 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN;
1755 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1757 static const char request_GET[] ALIGN1 = "GET";
1762 #if ENABLE_FEATURE_HTTPD_CGI
1763 static const char request_HEAD[] ALIGN1 = "HEAD";
1764 const char *prequest;
1765 char *cookie = NULL;
1766 char *content_type = NULL;
1767 unsigned long length = 0;
1768 #elif ENABLE_FEATURE_HTTPD_PROXY
1769 #define prequest request_GET
1770 unsigned long length = 0;
1772 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1773 smallint authorized = -1;
1775 smallint ip_allowed;
1776 char http_major_version;
1777 #if ENABLE_FEATURE_HTTPD_PROXY
1778 char http_minor_version;
1779 char *header_buf = header_buf; /* for gcc */
1780 char *header_ptr = header_ptr;
1781 Htaccess_Proxy *proxy_entry;
1784 /* Allocation of iobuf is postponed until now
1785 * (IOW, server process doesn't need to waste 8k) */
1786 iobuf = xmalloc(IOBUF_SIZE);
1789 if (fromAddr->u.sa.sa_family == AF_INET) {
1790 rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr);
1792 #if ENABLE_FEATURE_IPV6
1793 if (fromAddr->u.sa.sa_family == AF_INET6
1794 && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0
1795 && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0
1796 && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1797 rmt_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]);
1799 if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1800 /* NB: can be NULL (user runs httpd -i by hand?) */
1801 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa);
1804 /* this trick makes -v logging much simpler */
1806 applet_name = rmt_ip_str;
1808 bb_error_msg("connected");
1811 /* Install timeout handler. get_line() needs it. */
1812 signal(SIGALRM, send_REQUEST_TIMEOUT_and_exit);
1814 if (!get_line()) /* EOF or error or empty line */
1815 send_headers_and_exit(HTTP_BAD_REQUEST);
1817 /* Determine type of request (GET/POST) */
1818 urlp = strpbrk(iobuf, " \t");
1820 send_headers_and_exit(HTTP_BAD_REQUEST);
1822 #if ENABLE_FEATURE_HTTPD_CGI
1823 prequest = request_GET;
1824 if (strcasecmp(iobuf, prequest) != 0) {
1825 prequest = request_HEAD;
1826 if (strcasecmp(iobuf, prequest) != 0) {
1828 if (strcasecmp(iobuf, prequest) != 0)
1829 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1833 if (strcasecmp(iobuf, request_GET) != 0)
1834 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1836 urlp = skip_whitespace(urlp);
1838 send_headers_and_exit(HTTP_BAD_REQUEST);
1840 /* Find end of URL and parse HTTP version, if any */
1841 http_major_version = '0';
1842 IF_FEATURE_HTTPD_PROXY(http_minor_version = '0';)
1843 tptr = strchrnul(urlp, ' ');
1844 /* Is it " HTTP/"? */
1845 if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) {
1846 http_major_version = tptr[6];
1847 IF_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];)
1851 /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
1852 urlcopy = alloca((tptr - urlp) + 2 + strlen(index_page));
1853 /*if (urlcopy == NULL)
1854 * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
1855 strcpy(urlcopy, urlp);
1856 /* NB: urlcopy ptr is never changed after this */
1858 /* Extract url args if present */
1860 tptr = strchr(urlcopy, '?');
1866 /* Decode URL escape sequences */
1867 tptr = decodeString(urlcopy, 0);
1869 send_headers_and_exit(HTTP_BAD_REQUEST);
1870 if (tptr == urlcopy + 1) {
1871 /* '/' or NUL is encoded */
1872 send_headers_and_exit(HTTP_NOT_FOUND);
1875 /* Canonicalize path */
1876 /* Algorithm stolen from libbb bb_simplify_path(),
1877 * but don't strdup, retain trailing slash, protect root */
1878 urlp = tptr = urlcopy;
1881 /* skip duplicate (or initial) slash */
1886 /* skip extra "/./" */
1887 if (tptr[1] == '/' || !tptr[1]) {
1890 /* "..": be careful */
1891 if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
1893 if (urlp == urlcopy) /* protect root */
1894 send_headers_and_exit(HTTP_BAD_REQUEST);
1895 while (*--urlp != '/') /* omit previous dir */;
1902 *++urlp = '\0'; /* terminate after last character */
1904 /* If URL is a directory, add '/' */
1905 if (urlp[-1] != '/') {
1906 if (is_directory(urlcopy + 1, 1, &sb)) {
1907 found_moved_temporarily = urlcopy;
1913 bb_error_msg("url:%s", urlcopy);
1916 ip_allowed = checkPermIP();
1917 while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
1918 /* have path1/path2 */
1920 if (is_directory(urlcopy + 1, 1, &sb)) {
1921 /* may have subdir config */
1922 parse_conf(urlcopy + 1, SUBDIR_PARSE);
1923 ip_allowed = checkPermIP();
1928 #if ENABLE_FEATURE_HTTPD_PROXY
1929 proxy_entry = find_proxy_entry(urlcopy);
1931 header_buf = header_ptr = xmalloc(IOBUF_SIZE);
1934 if (http_major_version >= '0') {
1935 /* Request was with "... HTTP/nXXX", and n >= 0 */
1937 /* Read until blank line for HTTP version specified, else parse immediate */
1940 break; /* EOF or error or empty line */
1942 bb_error_msg("header: '%s'", iobuf);
1944 #if ENABLE_FEATURE_HTTPD_PROXY
1945 /* We need 2 more bytes for yet another "\r\n" -
1946 * see near fdprintf(proxy_fd...) further below */
1947 if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) {
1948 int len = strlen(iobuf);
1949 if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4)
1950 len = IOBUF_SIZE - (header_ptr - header_buf) - 4;
1951 memcpy(header_ptr, iobuf, len);
1953 header_ptr[0] = '\r';
1954 header_ptr[1] = '\n';
1959 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1960 /* Try and do our best to parse more lines */
1961 if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
1962 /* extra read only for POST */
1963 if (prequest != request_GET
1964 #if ENABLE_FEATURE_HTTPD_CGI
1965 && prequest != request_HEAD
1968 tptr = skip_whitespace(iobuf + sizeof("Content-length:") - 1);
1970 send_headers_and_exit(HTTP_BAD_REQUEST);
1971 /* not using strtoul: it ignores leading minus! */
1972 length = bb_strtou(tptr, NULL, 10);
1973 /* length is "ulong", but we need to pass it to int later */
1974 if (errno || length > INT_MAX)
1975 send_headers_and_exit(HTTP_BAD_REQUEST);
1979 #if ENABLE_FEATURE_HTTPD_CGI
1980 else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
1981 cookie = xstrdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
1982 } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
1983 content_type = xstrdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
1984 } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
1985 referer = xstrdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
1986 } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
1987 user_agent = xstrdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
1988 } else if (STRNCASECMP(iobuf, "Host:") == 0) {
1989 host = xstrdup(skip_whitespace(iobuf + sizeof("Host:")-1));
1990 } else if (STRNCASECMP(iobuf, "Accept:") == 0) {
1991 http_accept = xstrdup(skip_whitespace(iobuf + sizeof("Accept:")-1));
1992 } else if (STRNCASECMP(iobuf, "Accept-Language:") == 0) {
1993 http_accept_language = xstrdup(skip_whitespace(iobuf + sizeof("Accept-Language:")-1));
1996 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1997 if (STRNCASECMP(iobuf, "Authorization:") == 0) {
1998 /* We only allow Basic credentials.
1999 * It shows up as "Authorization: Basic <user>:<passwd>" where
2000 * "<user>:<passwd>" is base64 encoded.
2002 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
2003 if (STRNCASECMP(tptr, "Basic") != 0)
2005 tptr += sizeof("Basic")-1;
2006 /* decodeBase64() skips whitespace itself */
2008 authorized = check_user_passwd(urlcopy, tptr);
2011 #if ENABLE_FEATURE_HTTPD_RANGES
2012 if (STRNCASECMP(iobuf, "Range:") == 0) {
2013 /* We know only bytes=NNN-[MMM] */
2014 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
2015 if (strncmp(s, "bytes=", 6) == 0) {
2016 s += sizeof("bytes=")-1;
2017 range_start = BB_STRTOOFF(s, &s, 10);
2018 if (s[0] != '-' || range_start < 0) {
2021 range_end = BB_STRTOOFF(s+1, NULL, 10);
2022 if (errno || range_end < range_start)
2028 } /* while extra header reading */
2031 /* We are done reading headers, disable peer timeout */
2034 if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || !ip_allowed) {
2035 /* protect listing [/path]/httpd_conf or IP deny */
2036 send_headers_and_exit(HTTP_FORBIDDEN);
2039 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2040 /* Case: no "Authorization:" was seen, but page does require passwd.
2041 * Check that with dummy user:pass */
2043 authorized = check_user_passwd(urlcopy, ":");
2045 send_headers_and_exit(HTTP_UNAUTHORIZED);
2048 if (found_moved_temporarily) {
2049 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
2052 #if ENABLE_FEATURE_HTTPD_PROXY
2053 if (proxy_entry != NULL) {
2055 len_and_sockaddr *lsa;
2057 proxy_fd = socket(AF_INET, SOCK_STREAM, 0);
2059 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2060 lsa = host2sockaddr(proxy_entry->host_port, 80);
2062 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2063 if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0)
2064 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2065 fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n",
2066 prequest, /* GET or POST */
2067 proxy_entry->url_to, /* url part 1 */
2068 urlcopy + strlen(proxy_entry->url_from), /* url part 2 */
2069 (g_query ? "?" : ""), /* "?" (maybe) */
2070 (g_query ? g_query : ""), /* query string (maybe) */
2071 http_major_version, http_minor_version);
2072 header_ptr[0] = '\r';
2073 header_ptr[1] = '\n';
2075 write(proxy_fd, header_buf, header_ptr - header_buf);
2076 free(header_buf); /* on the order of 8k, free it */
2077 /* cgi_io_loop_and_exit needs to have two disctinct fds */
2078 cgi_io_loop_and_exit(proxy_fd, dup(proxy_fd), length);
2082 tptr = urlcopy + 1; /* skip first '/' */
2084 #if ENABLE_FEATURE_HTTPD_CGI
2085 if (strncmp(tptr, "cgi-bin/", 8) == 0) {
2086 if (tptr[8] == '\0') {
2087 /* protect listing "cgi-bin/" */
2088 send_headers_and_exit(HTTP_FORBIDDEN);
2090 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2092 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
2094 char *suffix = strrchr(tptr, '.');
2097 for (cur = script_i; cur; cur = cur->next) {
2098 if (strcmp(cur->before_colon + 1, suffix) == 0) {
2099 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2105 if (prequest != request_GET && prequest != request_HEAD) {
2106 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2108 #endif /* FEATURE_HTTPD_CGI */
2110 if (urlp[-1] == '/')
2111 strcpy(urlp, index_page);
2112 if (stat(tptr, &sb) == 0) {
2113 file_size = sb.st_size;
2114 last_mod = sb.st_mtime;
2116 #if ENABLE_FEATURE_HTTPD_CGI
2117 else if (urlp[-1] == '/') {
2118 /* It's a dir URL and there is no index.html
2119 * Try cgi-bin/index.cgi */
2120 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
2123 send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
2128 * fall through to send_file, it errors out if open fails
2132 send_file_and_exit(tptr,
2133 #if ENABLE_FEATURE_HTTPD_CGI
2134 (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS)
2136 SEND_HEADERS_AND_BODY
2142 * The main http server function.
2143 * Given a socket, listen for new connections and farm out
2144 * the processing as a [v]forked process.
2148 static void mini_httpd(int server_socket) NORETURN;
2149 static void mini_httpd(int server_socket)
2151 /* NB: it's best to not use xfuncs in this loop before fork().
2152 * Otherwise server may die on transient errors (temporary
2153 * out-of-memory condition, etc), which is Bad(tm).
2154 * Try to do any dangerous calls after fork.
2158 len_and_sockaddr fromAddr;
2160 /* Wait for connections... */
2161 fromAddr.len = LSA_SIZEOF_SA;
2162 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2166 /* set the KEEPALIVE option to cull dead connections */
2167 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2171 /* Do not reload config on HUP */
2172 signal(SIGHUP, SIG_IGN);
2173 close(server_socket);
2177 handle_incoming_and_exit(&fromAddr);
2179 /* parent, or fork failed */
2185 static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN;
2186 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2188 char *argv_copy[argc + 2];
2190 argv_copy[0] = argv[0];
2191 argv_copy[1] = (char*)"-i";
2192 memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2194 /* NB: it's best to not use xfuncs in this loop before vfork().
2195 * Otherwise server may die on transient errors (temporary
2196 * out-of-memory condition, etc), which is Bad(tm).
2197 * Try to do any dangerous calls after fork.
2201 len_and_sockaddr fromAddr;
2203 /* Wait for connections... */
2204 fromAddr.len = LSA_SIZEOF_SA;
2205 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2209 /* set the KEEPALIVE option to cull dead connections */
2210 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2214 /* Do not reload config on HUP */
2215 signal(SIGHUP, SIG_IGN);
2216 close(server_socket);
2220 /* Run a copy of ourself in inetd mode */
2223 /* parent, or vfork failed */
2231 * Process a HTTP connection on stdin/out.
2234 static void mini_httpd_inetd(void) NORETURN;
2235 static void mini_httpd_inetd(void)
2237 len_and_sockaddr fromAddr;
2239 memset(&fromAddr, 0, sizeof(fromAddr));
2240 fromAddr.len = LSA_SIZEOF_SA;
2241 /* NB: can fail if user runs it by hand and types in http cmds */
2242 getpeername(0, &fromAddr.u.sa, &fromAddr.len);
2243 handle_incoming_and_exit(&fromAddr);
2246 static void sighup_handler(int sig UNUSED_PARAM)
2248 parse_conf(default_path_httpd_conf, SIGNALED_PARSE);
2252 c_opt_config_file = 0,
2255 IF_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2256 IF_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,)
2257 IF_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,)
2258 IF_FEATURE_HTTPD_SETUID( u_opt_setuid ,)
2263 OPT_CONFIG_FILE = 1 << c_opt_config_file,
2264 OPT_DECODE_URL = 1 << d_opt_decode_url,
2265 OPT_HOME_HTTPD = 1 << h_opt_home_httpd,
2266 OPT_ENCODE_URL = IF_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2267 OPT_REALM = IF_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0,
2268 OPT_MD5 = IF_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0,
2269 OPT_SETUID = IF_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0,
2270 OPT_PORT = 1 << p_opt_port,
2271 OPT_INETD = 1 << p_opt_inetd,
2272 OPT_FOREGROUND = 1 << p_opt_foreground,
2273 OPT_VERBOSE = 1 << p_opt_verbose,
2277 int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2278 int httpd_main(int argc UNUSED_PARAM, char **argv)
2280 int server_socket = server_socket; /* for gcc */
2282 char *url_for_decode;
2283 IF_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2284 IF_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2285 IF_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2286 IF_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2290 #if ENABLE_LOCALE_SUPPORT
2291 /* Undo busybox.c: we want to speak English in http (dates etc) */
2292 setlocale(LC_TIME, "C");
2295 home_httpd = xrealloc_getcwd_or_warn(NULL);
2296 /* -v counts, -i implies -f */
2297 opt_complementary = "vv:if";
2298 /* We do not "absolutize" path given by -h (home) opt.
2299 * If user gives relative path in -h,
2300 * $SCRIPT_FILENAME will not be set. */
2301 opt = getopt32(argv, "c:d:h:"
2302 IF_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2303 IF_FEATURE_HTTPD_BASIC_AUTH("r:")
2304 IF_FEATURE_HTTPD_AUTH_MD5("m:")
2305 IF_FEATURE_HTTPD_SETUID("u:")
2307 &configFile, &url_for_decode, &home_httpd
2308 IF_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2309 IF_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2310 IF_FEATURE_HTTPD_AUTH_MD5(, &pass)
2311 IF_FEATURE_HTTPD_SETUID(, &s_ugid)
2312 , &bind_addr_or_port
2315 if (opt & OPT_DECODE_URL) {
2316 fputs(decodeString(url_for_decode, 1), stdout);
2319 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2320 if (opt & OPT_ENCODE_URL) {
2321 fputs(encodeString(url_for_encode), stdout);
2325 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2326 if (opt & OPT_MD5) {
2327 puts(pw_encrypt(pass, "$1$", 1));
2331 #if ENABLE_FEATURE_HTTPD_SETUID
2332 if (opt & OPT_SETUID) {
2333 xget_uidgid(&ugid, s_ugid);
2338 if (!(opt & OPT_FOREGROUND)) {
2339 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2344 if (!(opt & OPT_INETD)) {
2345 signal(SIGCHLD, SIG_IGN);
2346 server_socket = openServer();
2347 #if ENABLE_FEATURE_HTTPD_SETUID
2348 /* drop privileges */
2349 if (opt & OPT_SETUID) {
2350 if (ugid.gid != (gid_t)-1) {
2351 if (setgroups(1, &ugid.gid) == -1)
2352 bb_perror_msg_and_die("setgroups");
2361 /* User can do it himself: 'env - PATH="$PATH" httpd'
2362 * We don't do it because we don't want to screw users
2364 * 'env - VAR1=val1 VAR2=val2 httpd'
2365 * and have VAR1 and VAR2 values visible in their CGIs.
2366 * Besides, it is also smaller. */
2368 char *p = getenv("PATH");
2369 /* env strings themself are not freed, no need to xstrdup(p): */
2373 // if (!(opt & OPT_INETD))
2374 // setenv_long("SERVER_PORT", ???);
2378 parse_conf(default_path_httpd_conf, FIRST_PARSE);
2379 if (!(opt & OPT_INETD))
2380 signal(SIGHUP, sighup_handler);
2382 xfunc_error_retval = 0;
2383 if (opt & OPT_INETD)
2386 if (!(opt & OPT_FOREGROUND))
2387 bb_daemonize(0); /* don't change current directory */
2388 mini_httpd(server_socket); /* never returns */
2390 mini_httpd_nommu(server_socket, argc, argv); /* never returns */