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 server 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 * A:172.20. # Allow address from 172.20.0.0/16
41 * A:10.0.0.0/25 # Allow any address from 10.0.0.0-10.0.0.127
42 * A:10.0.0.0/255.255.255.128 # Allow any address that previous set
43 * A:127.0.0.1 # Allow local loopback connections
44 * D:* # Deny from other IP connections
45 * E404:/path/e404.html # /path/e404.html is the 404 (not found) error page
47 * P:/url:[http://]hostname[:port]/new/path
48 * # When /urlXXXXXX is requested, reverse proxy
49 * # it to http://hostname[:port]/new/pathXXXXXX
51 * /cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/
52 * /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/
53 * /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/
54 * .au:audio/basic # additional mime type for audio.au files
55 * *.php:/path/php # running cgi.php scripts through an interpreter
57 * A/D may be as a/d or allow/deny - first char case insensitive
58 * Deny IP rules take precedence over allow rules.
61 * The Deny/Allow IP logic:
63 * - Default is to allow all. No addresses are denied unless
64 * denied with a D: rule.
65 * - Order of Deny/Allow rules is significant
66 * - Deny rules take precedence over allow rules.
67 * - If a deny all rule (D:*) is used it acts as a catch-all for unmatched
69 * - Specification of Allow all (A:*) is a no-op
72 * 1. Allow only specified addresses
73 * A:172.20 # Allow any address that begins with 172.20.
74 * A:10.10. # Allow any address that begins with 10.10.
75 * A:127.0.0.1 # Allow local loopback connections
76 * D:* # Deny from other IP connections
78 * 2. Only deny specified addresses
79 * D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255
80 * D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255
81 * A:* # (optional line added for clarity)
83 * If a sub directory contains a config file it is parsed and merged with
84 * any existing settings as if it was appended to the original configuration.
86 * subdir paths are relative to the containing subdir and thus cannot
87 * affect the parent rules.
89 * Note that since the sub dir is parsed in the forked thread servicing the
90 * subdir http request, any merge is discarded when the process exits. As a
91 * result, the subdir settings only have a lifetime of a single request.
93 * Custom error pages can contain an absolute path or be relative to
94 * 'home_httpd'. Error pages are to be static files (no CGI or script). Error
95 * page can only be defined in the root configuration file and are not taken
96 * into account in local (directories) config files.
98 * If -c is not set, an attempt will be made to open the default
99 * root configuration file. If -c is set and the file is not found, the
100 * server exits with an error.
105 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
106 #include <sys/sendfile.h>
112 #define IOBUF_SIZE 8192 /* IO buffer */
114 /* amount of buffering in a pipe */
116 # define PIPE_BUF 4096
118 #if PIPE_BUF >= IOBUF_SIZE
119 # error "PIPE_BUF >= IOBUF_SIZE"
122 #define HEADER_READ_TIMEOUT 60
124 static const char default_path_httpd_conf[] ALIGN1 = "/etc";
125 static const char httpd_conf[] ALIGN1 = "httpd.conf";
126 static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
128 typedef struct has_next_ptr {
129 struct has_next_ptr *next;
132 /* Must have "next" as a first member */
133 typedef struct Htaccess {
134 struct Htaccess *next;
136 char before_colon[1]; /* really bigger, must be last */
139 /* Must have "next" as a first member */
140 typedef struct Htaccess_IP {
141 struct Htaccess_IP *next;
147 /* Must have "next" as a first member */
148 typedef struct Htaccess_Proxy {
149 struct Htaccess_Proxy *next;
157 HTTP_PARTIAL_CONTENT = 206,
158 HTTP_MOVED_TEMPORARILY = 302,
159 HTTP_BAD_REQUEST = 400, /* malformed syntax */
160 HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
161 HTTP_NOT_FOUND = 404,
162 HTTP_FORBIDDEN = 403,
163 HTTP_REQUEST_TIMEOUT = 408,
164 HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */
165 HTTP_INTERNAL_SERVER_ERROR = 500,
167 #if 0 /* future use */
168 HTTP_SWITCHING_PROTOCOLS = 101,
171 HTTP_NON_AUTHORITATIVE_INFO = 203,
172 HTTP_NO_CONTENT = 204,
173 HTTP_MULTIPLE_CHOICES = 300,
174 HTTP_MOVED_PERMANENTLY = 301,
175 HTTP_NOT_MODIFIED = 304,
176 HTTP_PAYMENT_REQUIRED = 402,
177 HTTP_BAD_GATEWAY = 502,
178 HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
179 HTTP_RESPONSE_SETSIZE = 0xffffffff
183 static const uint16_t http_response_type[] ALIGN2 = {
185 #if ENABLE_FEATURE_HTTPD_RANGES
186 HTTP_PARTIAL_CONTENT,
188 HTTP_MOVED_TEMPORARILY,
189 HTTP_REQUEST_TIMEOUT,
190 HTTP_NOT_IMPLEMENTED,
191 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
197 HTTP_INTERNAL_SERVER_ERROR,
198 #if 0 /* not implemented */
202 HTTP_MULTIPLE_CHOICES,
203 HTTP_MOVED_PERMANENTLY,
206 HTTP_SERVICE_UNAVAILABLE,
210 static const struct {
213 } http_response[ARRAY_SIZE(http_response_type)] = {
215 #if ENABLE_FEATURE_HTTPD_RANGES
216 { "Partial Content", NULL },
219 { "Request Timeout", "No request appeared within 60 seconds" },
220 { "Not Implemented", "The requested method is not recognized" },
221 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
222 { "Unauthorized", "" },
224 { "Not Found", "The requested URL was not found" },
225 { "Bad Request", "Unsupported method" },
227 { "Internal Server Error", "Internal Server Error" },
228 #if 0 /* not implemented */
232 { "Multiple Choices" },
233 { "Moved Permanently" },
235 { "Bad Gateway", "" },
236 { "Service Unavailable", "" },
242 int verbose; /* must be int (used by getopt32) */
243 smallint flg_deny_all;
245 unsigned rmt_ip; /* used for IP-based allow/deny rules */
247 char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */
248 const char *bind_addr_or_port;
251 const char *configFile;
252 const char *home_httpd;
254 const char *found_mime_type;
255 const char *found_moved_temporarily;
256 Htaccess_IP *ip_a_d; /* config allow/deny lines */
258 USE_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
259 USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
260 USE_FEATURE_HTTPD_CGI(char *referer;)
261 USE_FEATURE_HTTPD_CGI(char *user_agent;)
263 off_t file_size; /* -1 - unknown */
264 #if ENABLE_FEATURE_HTTPD_RANGES
270 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
271 Htaccess *g_auth; /* config user:password lines */
273 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
274 Htaccess *mime_a; /* config mime types */
276 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
277 Htaccess *script_i; /* config script interpreters */
279 char *iobuf; /* [IOBUF_SIZE] */
280 #define hdr_buf bb_common_bufsiz1
283 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
284 const char *http_error_page[ARRAY_SIZE(http_response_type)];
286 #if ENABLE_FEATURE_HTTPD_PROXY
287 Htaccess_Proxy *proxy;
290 #define G (*ptr_to_globals)
291 #define verbose (G.verbose )
292 #define flg_deny_all (G.flg_deny_all )
293 #define rmt_ip (G.rmt_ip )
294 #define bind_addr_or_port (G.bind_addr_or_port)
295 #define g_query (G.g_query )
296 #define configFile (G.configFile )
297 #define home_httpd (G.home_httpd )
298 #define found_mime_type (G.found_mime_type )
299 #define found_moved_temporarily (G.found_moved_temporarily)
300 #define last_mod (G.last_mod )
301 #define ip_a_d (G.ip_a_d )
302 #define g_realm (G.g_realm )
303 #define remoteuser (G.remoteuser )
304 #define referer (G.referer )
305 #define user_agent (G.user_agent )
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 )
312 #define rmt_ip_str (G.rmt_ip_str )
313 #define g_auth (G.g_auth )
314 #define mime_a (G.mime_a )
315 #define script_i (G.script_i )
316 #define iobuf (G.iobuf )
317 #define hdr_ptr (G.hdr_ptr )
318 #define hdr_cnt (G.hdr_cnt )
319 #define http_error_page (G.http_error_page )
320 #define proxy (G.proxy )
321 #define INIT_G() do { \
322 PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
323 USE_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
324 bind_addr_or_port = "80"; \
328 #if !ENABLE_FEATURE_HTTPD_RANGES
331 range_end = MAXINT(off_t) - 1,
332 range_len = MAXINT(off_t),
337 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
340 static void send_file_and_exit(const char *url, int headers) ATTRIBUTE_NORETURN;
342 static void free_llist(has_next_ptr **pptr)
344 has_next_ptr *cur = *pptr;
346 has_next_ptr *t = cur;
353 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
354 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
355 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
356 static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
358 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
483 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
484 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
485 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
488 const char *cf = configFile;
494 /* discard old rules */
495 free_Htaccess_IP_list(&ip_a_d);
497 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
498 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
499 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
500 /* retain previous auth and mime config only for subdir parse */
501 if (flag != SUBDIR_PARSE) {
502 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
503 free_Htaccess_list(&g_auth);
505 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
506 free_Htaccess_list(&mime_a);
508 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
509 free_Htaccess_list(&script_i);
514 if (flag == SUBDIR_PARSE || cf == NULL) {
515 cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
516 sprintf((char *)cf, "%s/%s", path, httpd_conf);
519 while ((f = fopen(cf, "r")) == NULL) {
520 if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
521 /* config file not found, no changes to config */
524 if (configFile && flag == FIRST_PARSE) /* if -c option given */
525 bb_simple_perror_msg_and_die(cf);
526 flag = FIND_FROM_HTTPD_ROOT;
530 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
533 /* This could stand some work */
534 while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
536 for (p = p0; *p0 != '\0' && *p0 != '#'; p0++) {
539 if (*p0 == ':' && c == NULL)
545 /* test for empty or strange line */
546 if (c == NULL || *c == '\0')
553 /* memorize deny all */
556 /* skip default other "word:*" config lines */
562 if (*p0 == 'A' || *p0 == 'D') {
563 /* storing current config IP line */
564 pip = xzalloc(sizeof(Htaccess_IP));
566 if (scan_ip_mask(c, &(pip->ip), &(pip->mask))) {
567 /* syntax IP{/mask} error detected, protect all */
571 pip->allow_deny = *p0;
573 /* Deny:from_IP move top */
577 /* add to bottom A:form_IP config line */
578 Htaccess_IP *prev_IP = ip_a_d;
580 if (prev_IP == NULL) {
583 while (prev_IP->next)
584 prev_IP = prev_IP->next;
592 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
593 if (flag == FIRST_PARSE && *p0 == 'E') {
595 /* error status code */
596 int status = atoi(++p0);
597 /* c already points at the character following ':' in parse loop */
598 /* c = strchr(p0, ':'); c++; */
599 if (status < HTTP_CONTINUE) {
600 bb_error_msg("config error '%s' in '%s'", buf, cf);
604 /* then error page; find matching status */
605 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
606 if (http_response_type[i] == status) {
607 http_error_page[i] = concat_path_file((*c == '/') ? NULL : home_httpd, c);
615 #if ENABLE_FEATURE_HTTPD_PROXY
616 if (flag == FIRST_PARSE && *p0 == 'P') {
617 /* P:/url:[http://]hostname[:port]/new/path */
618 char *url_from, *host_port, *url_to;
619 Htaccess_Proxy *proxy_entry;
622 host_port = strchr(c, ':');
623 if (host_port == NULL) {
624 bb_error_msg("config error '%s' in '%s'", buf, cf);
628 if (strncmp(host_port, "http://", 7) == 0)
630 if (*host_port == '\0') {
631 bb_error_msg("config error '%s' in '%s'", buf, cf);
634 url_to = strchr(host_port, '/');
635 if (url_to == NULL) {
636 bb_error_msg("config error '%s' in '%s'", buf, cf);
640 proxy_entry = xzalloc(sizeof(Htaccess_Proxy));
641 proxy_entry->url_from = xstrdup(url_from);
642 proxy_entry->host_port = xstrdup(host_port);
644 proxy_entry->url_to = xstrdup(url_to);
645 proxy_entry->next = proxy;
651 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
653 /* make full path from httpd root / current_path / config_line_path */
654 cf = (flag == SUBDIR_PARSE ? path : "");
655 p0 = xmalloc(strlen(cf) + (c - buf) + 2 + strlen(c));
657 sprintf(p0, "/%s%s", cf, buf);
659 /* another call bb_simplify_path */
664 if (*cf == '/') { /* skip duplicate (or initial) slash */
668 if (cf[1] == '/' || cf[1] == '\0') { /* remove extra '.' */
671 if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == '\0')) {
674 while (*--p != '/') /* omit previous dir */;
683 if ((p == p0) || (*p != '/')) { /* not a trailing slash */
684 ++p; /* so keep last character */
691 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
692 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
693 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
694 /* storing current config line */
695 cur = xzalloc(sizeof(Htaccess) + strlen(p0));
696 cf = strcpy(cur->before_colon, p0);
697 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
703 cur->after_colon = c;
704 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
706 /* config .mime line move top for overwrite previous */
712 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
713 if (*cf == '*' && cf[1] == '.') {
714 /* config script interpreter line move top for overwrite previous */
715 cur->next = script_i;
720 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
725 /* sort path, if current length eq or bigger then move up */
726 Htaccess *prev_hti = g_auth;
727 size_t l = strlen(cf);
730 for (hti = prev_hti; hti; hti = hti->next) {
731 if (l >= strlen(hti->before_colon)) {
732 /* insert before hti */
734 if (prev_hti != hti) {
735 prev_hti->next = cur;
743 prev_hti = prev_hti->next;
745 if (!hti) { /* not inserted, add to bottom */
750 #endif /* BASIC_AUTH */
751 #endif /* BASIC_AUTH || MIME_TYPES || SCRIPT_INTERPR */
752 } /* while (fgets) */
756 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
758 * Given a string, html-encode special characters.
759 * This is used for the -e command line option to provide an easy way
760 * for scripts to encode result data without confusing browsers. The
761 * returned string pointer is memory allocated by malloc().
763 * Returns a pointer to the encoded string (malloced).
765 static char *encodeString(const char *string)
767 /* take the simple route and encode everything */
768 /* could possibly scan once to get length. */
769 int len = strlen(string);
770 char *out = xmalloc(len * 6 + 1);
774 while ((ch = *string++)) {
775 /* very simple check for what to encode */
779 p += sprintf(p, "&#%d;", (unsigned char) ch);
784 #endif /* FEATURE_HTTPD_ENCODE_URL_STR */
787 * Given a URL encoded string, convert it to plain ascii.
788 * Since decoding always makes strings smaller, the decode is done in-place.
789 * Thus, callers should strdup() the argument if they do not want the
790 * argument modified. The return is the original pointer, allowing this
791 * function to be easily used as arguments to other functions.
793 * string The first string to decode.
794 * option_d 1 if called for httpd -d
796 * Returns a pointer to the decoded string (same as input).
798 static unsigned hex_to_bin(unsigned char c)
805 /* c | 0x20: letters to lower case, non-letters
806 * to (potentially different) non-letters */
807 v = (unsigned)(c | 0x20) - 'a';
813 void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
814 int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
815 t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
817 static char *decodeString(char *orig, int option_d)
819 /* note that decoded string is always shorter than original */
824 while ((c = *ptr++) != '\0') {
827 if (option_d && c == '+') {
835 v = hex_to_bin(ptr[0]);
843 v = (v * 16) | hex_to_bin(ptr[1]);
846 if (!option_d && (v == '/' || v == '\0')) {
847 /* caller takes it as indication of invalid
848 * (dangerous wrt exploits) chars */
858 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
860 * Decode a base64 data stream as per rfc1521.
861 * Note that the rfc states that non base64 chars are to be ignored.
862 * Since the decode always results in a shorter size than the input,
863 * it is OK to pass the input arg as an output arg.
864 * Parameter: a pointer to a base64 encoded string.
865 * Decoded data is stored in-place.
867 static void decodeBase64(char *Data)
869 const unsigned char *in = (const unsigned char *)Data;
870 /* The decoded size will be at most 3/4 the size of the encoded */
877 if (t >= '0' && t <= '9')
879 else if (t >= 'A' && t <= 'Z')
881 else if (t >= 'a' && t <= 'z')
895 *Data++ = (char) (ch >> 16);
896 *Data++ = (char) (ch >> 8);
906 * Create a listen server socket on the designated port.
908 static int openServer(void)
910 unsigned n = bb_strtou(bind_addr_or_port, NULL, 10);
911 if (!errno && n && n <= 0xffff)
912 n = create_and_bind_stream_or_die(NULL, n);
914 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
920 * Log the connection closure and exit.
922 static void log_and_exit(void) ATTRIBUTE_NORETURN;
923 static void log_and_exit(void)
925 /* Paranoia. IE said to be buggy. It may send some extra data
926 * or be confused by us just exiting without SHUT_WR. Oh well. */
927 shutdown(1, SHUT_WR);
929 while (read(0, iobuf, IOBUF_SIZE) > 0)
933 bb_error_msg("closed");
934 _exit(xfunc_error_retval);
938 * Create and send HTTP response headers.
939 * The arguments are combined and sent as one write operation. Note that
940 * IE will puke big-time if the headers are not sent in one packet and the
941 * second packet is delayed for any reason.
942 * responseNum - the result code to send.
944 static void send_headers(int responseNum)
946 static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
948 const char *responseString = "";
949 const char *infoString = NULL;
950 const char *mime_type;
951 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
952 const char *error_page = 0;
955 time_t timer = time(0);
959 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
960 if (http_response_type[i] == responseNum) {
961 responseString = http_response[i].name;
962 infoString = http_response[i].info;
963 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
964 error_page = http_error_page[i];
969 /* error message is HTML */
970 mime_type = responseNum == HTTP_OK ?
971 found_mime_type : "text/html";
974 bb_error_msg("response:%u", responseNum);
976 /* emit the current date */
977 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
979 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
980 "Date: %s\r\nConnection: close\r\n",
981 responseNum, responseString, mime_type, tmp_str);
983 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
984 if (responseNum == HTTP_UNAUTHORIZED) {
985 len += sprintf(iobuf + len,
986 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
990 if (responseNum == HTTP_MOVED_TEMPORARILY) {
991 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
992 found_moved_temporarily,
993 (g_query ? "?" : ""),
994 (g_query ? g_query : ""));
997 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
998 if (error_page && !access(error_page, R_OK)) {
999 strcat(iobuf, "\r\n");
1003 fprintf(stderr, "headers: '%s'\n", iobuf);
1004 full_write(1, iobuf, len);
1006 fprintf(stderr, "writing error page: '%s'\n", error_page);
1007 return send_file_and_exit(error_page, FALSE);
1011 if (file_size != -1) { /* file */
1012 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
1013 #if ENABLE_FEATURE_HTTPD_RANGES
1014 if (responseNum == HTTP_PARTIAL_CONTENT) {
1015 len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n",
1019 file_size = range_end - range_start + 1;
1022 len += sprintf(iobuf + len,
1023 #if ENABLE_FEATURE_HTTPD_RANGES
1024 "Accept-Ranges: bytes\r\n"
1026 "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
1032 iobuf[len++] = '\r';
1033 iobuf[len++] = '\n';
1035 len += sprintf(iobuf + len,
1036 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
1037 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
1038 responseNum, responseString,
1039 responseNum, responseString, infoString);
1042 fprintf(stderr, "headers: '%s'\n", iobuf);
1043 if (full_write(1, iobuf, len) != len) {
1045 bb_perror_msg("error");
1050 static void send_headers_and_exit(int responseNum) ATTRIBUTE_NORETURN;
1051 static void send_headers_and_exit(int responseNum)
1053 send_headers(responseNum);
1058 * Read from the socket until '\n' or EOF. '\r' chars are removed.
1059 * '\n' is replaced with NUL.
1060 * Return number of characters read or 0 if nothing is read
1061 * ('\r' and '\n' are not counted).
1062 * Data is returned in iobuf.
1064 static int get_line(void)
1071 hdr_cnt = safe_read(0, hdr_buf, sizeof(hdr_buf));
1076 iobuf[count] = c = *hdr_ptr++;
1082 iobuf[count] = '\0';
1085 if (count < (IOBUF_SIZE - 1)) /* check overflow */
1091 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1093 /* gcc 4.2.1 fares better with NOINLINE */
1094 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) ATTRIBUTE_NORETURN;
1095 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1097 enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1098 struct pollfd pfd[3];
1099 int out_cnt; /* we buffer a bit of initial CGI output */
1102 /* iobuf is used for CGI -> network data,
1103 * hdr_buf is for network -> CGI data (POSTDATA) */
1105 /* If CGI dies, we still want to correctly finish reading its output
1106 * and send it to the peer. So please no SIGPIPEs! */
1107 signal(SIGPIPE, SIG_IGN);
1109 // We inconsistently handle a case when more POSTDATA from network
1110 // is coming than we expected. We may give *some part* of that
1111 // extra data to CGI.
1113 //if (hdr_cnt > post_len) {
1114 // /* We got more POSTDATA from network than we expected */
1115 // hdr_cnt = post_len;
1117 post_len -= hdr_cnt;
1118 /* post_len - number of POST bytes not yet read from network */
1120 /* NB: breaking out of this loop jumps to log_and_exit() */
1123 memset(pfd, 0, sizeof(pfd));
1125 pfd[FROM_CGI].fd = fromCgi_rd;
1126 pfd[FROM_CGI].events = POLLIN;
1129 pfd[TO_CGI].fd = toCgi_wr;
1131 pfd[TO_CGI].events = POLLOUT;
1132 } else if (post_len > 0) {
1133 pfd[0].events = POLLIN;
1135 /* post_len <= 0 && hdr_cnt <= 0:
1136 * no more POST data to CGI,
1137 * let CGI see EOF on CGI's stdin */
1143 /* Now wait on the set of sockets */
1144 count = safe_poll(pfd, 3, -1);
1147 if (waitpid(pid, &status, WNOHANG) <= 0) {
1148 /* Weird. CGI didn't exit and no fd's
1149 * are ready, yet poll returned?! */
1152 if (DEBUG && WIFEXITED(status))
1153 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1154 if (DEBUG && WIFSIGNALED(status))
1155 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1160 if (pfd[TO_CGI].revents) {
1161 /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */
1162 /* Have data from peer and can write to CGI */
1163 count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1164 /* Doesn't happen, we dont use nonblocking IO here
1165 *if (count < 0 && errno == EAGAIN) {
1172 /* EOF/broken pipe to CGI, stop piping POST data */
1173 hdr_cnt = post_len = 0;
1177 if (pfd[0].revents) {
1178 /* post_len > 0 && hdr_cnt == 0 here */
1179 /* We expect data, prev data portion is eaten by CGI
1180 * and there *is* data to read from the peer
1182 //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
1183 //count = safe_read(0, hdr_buf, count);
1184 count = safe_read(0, hdr_buf, sizeof(hdr_buf));
1190 /* no more POST data can be read */
1195 if (pfd[FROM_CGI].revents) {
1196 /* There is something to read from CGI */
1199 /* Are we still buffering CGI output? */
1201 /* HTTP_200[] has single "\r\n" at the end.
1202 * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1203 * CGI scripts MUST send their own header terminated by
1204 * empty line, then data. That's why we have only one
1205 * <cr><lf> pair here. We will output "200 OK" line
1206 * if needed, but CGI still has to provide blank line
1207 * between header and body */
1209 /* Must use safe_read, not full_read, because
1210 * CGI may output a few first bytes and then wait
1211 * for POSTDATA without closing stdout.
1212 * With full_read we may wait here forever. */
1213 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1215 /* eof (or error) and there was no "HTTP",
1216 * so write it, then write received data */
1218 full_write(1, HTTP_200, sizeof(HTTP_200)-1);
1219 full_write(1, rbuf, out_cnt);
1221 break; /* CGI stdout is closed, exiting */
1225 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1226 if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1227 /* send "HTTP/1.0 " */
1228 if (full_write(1, HTTP_200, 9) != 9)
1230 rbuf += 8; /* skip "Status: " */
1231 count = out_cnt - 8;
1232 out_cnt = -1; /* buffering off */
1233 } else if (out_cnt >= 4) {
1234 /* Did CGI add "HTTP"? */
1235 if (memcmp(rbuf, HTTP_200, 4) != 0) {
1236 /* there is no "HTTP", do it ourself */
1237 if (full_write(1, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1241 if (!strstr(rbuf, "ontent-")) {
1242 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1244 * Counter-example of valid CGI without Content-type:
1245 * echo -en "HTTP/1.0 302 Found\r\n"
1246 * echo -en "Location: http://www.busybox.net\r\n"
1250 out_cnt = -1; /* buffering off */
1253 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1255 break; /* eof (or error) */
1257 if (full_write(1, rbuf, count) != count)
1260 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1261 } /* if (pfd[FROM_CGI].revents) */
1267 #if ENABLE_FEATURE_HTTPD_CGI
1269 static void setenv1(const char *name, const char *value)
1271 setenv(name, value ? value : "", 1);
1275 * Spawn CGI script, forward CGI's stdin/out <=> network
1277 * Environment variables are set up and the script is invoked with pipes
1278 * for stdin/stdout. If a POST is being done the script is fed the POST
1279 * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1282 * const char *url The requested URL (with leading /).
1283 * int post_len Length of the POST body.
1284 * const char *cookie For set HTTP_COOKIE.
1285 * const char *content_type For set CONTENT_TYPE.
1287 static void send_cgi_and_exit(
1289 const char *request,
1292 const char *content_type) ATTRIBUTE_NORETURN;
1293 static void send_cgi_and_exit(
1295 const char *request,
1298 const char *content_type)
1300 struct { int rd; int wr; } fromCgi; /* CGI -> httpd pipe */
1301 struct { int rd; int wr; } toCgi; /* httpd -> CGI pipe */
1308 * We are mucking with environment _first_ and then vfork/exec,
1309 * this allows us to use vfork safely. Parent don't care about
1310 * these environment changes anyway.
1316 purl = xstrdup(url);
1318 while ((script = strchr(script + 1, '/')) != NULL) {
1319 /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
1323 if (!is_directory(purl + 1, 1, &sb)) {
1324 /* not directory, found script.cgi/PATH_INFO */
1328 *script = '/'; /* is directory, find next '/' */
1330 setenv1("PATH_INFO", script); /* set /PATH_INFO or "" */
1331 setenv1("REQUEST_METHOD", request);
1333 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", purl, g_query));
1335 setenv1("REQUEST_URI", purl);
1338 *script = '\0'; /* cut off /PATH_INFO */
1340 /* SCRIPT_FILENAME required by PHP in CGI mode */
1341 fullpath = concat_path_file(home_httpd, purl);
1342 setenv1("SCRIPT_FILENAME", fullpath);
1343 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1344 setenv1("SCRIPT_NAME", purl);
1345 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1346 * QUERY_STRING: The information which follows the ? in the URL
1347 * which referenced this script. This is the query information.
1348 * It should not be decoded in any fashion. This variable
1349 * should always be set when there is query information,
1350 * regardless of command line decoding. */
1351 /* (Older versions of bbox seem to do some decoding) */
1352 setenv1("QUERY_STRING", g_query);
1353 putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1354 putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1355 putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1356 /* Having _separate_ variables for IP and port defeats
1357 * the purpose of having socket abstraction. Which "port"
1358 * are you using on Unix domain socket?
1359 * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1362 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1363 char *cp = strrchr(p, ':');
1364 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1366 if (cp) *cp = '\0'; /* delete :PORT */
1367 setenv1("REMOTE_ADDR", p);
1370 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1371 setenv1("REMOTE_PORT", cp + 1);
1375 setenv1("HTTP_USER_AGENT", user_agent);
1377 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1379 setenv1("HTTP_COOKIE", cookie);
1381 setenv1("CONTENT_TYPE", content_type);
1382 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1384 setenv1("REMOTE_USER", remoteuser);
1385 putenv((char*)"AUTH_TYPE=Basic");
1389 setenv1("HTTP_REFERER", referer);
1396 /* TODO: log perror? */
1402 xfunc_error_retval = 242;
1404 xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */
1405 xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */
1408 /* User seeing stderr output can be a security problem.
1409 * If CGI really wants that, it can always do dup itself. */
1412 /* script must have absolute path */
1413 script = strrchr(fullpath, '/');
1415 goto error_execing_cgi;
1417 /* chdiring to script's dir */
1418 if (chdir(fullpath) == 0) {
1420 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1421 char *interpr = NULL;
1422 char *suffix = strrchr(purl, '.');
1426 for (cur = script_i; cur; cur = cur->next) {
1427 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1428 interpr = cur->after_colon;
1435 /* set argv[0] to name without path */
1436 argv[0] = (char*)bb_basename(purl);
1438 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1440 execv(interpr, argv);
1443 execv(fullpath, argv);
1447 * (we are CGI here, our stdout is pumped to the net) */
1448 send_headers_and_exit(HTTP_NOT_FOUND);
1451 /* Parent process */
1453 /* Restore variables possibly changed by child */
1454 xfunc_error_retval = 0;
1459 cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1462 #endif /* FEATURE_HTTPD_CGI */
1465 * Send a file response to a HTTP request, and exit
1468 * const char *url The requested URL (with leading /).
1469 * headers Don't send headers before if FALSE.
1471 static void send_file_and_exit(const char *url, int headers)
1473 static const char *const suffixTable[] = {
1474 /* Warning: shorter equivalent suffix in one line must be first */
1475 ".htm.html", "text/html",
1476 ".jpg.jpeg", "image/jpeg",
1477 ".gif", "image/gif",
1478 ".png", "image/png",
1479 ".txt.h.c.cc.cpp", "text/plain",
1481 ".wav", "audio/wav",
1482 ".avi", "video/x-msvideo",
1483 ".qt.mov", "video/quicktime",
1484 ".mpe.mpeg", "video/mpeg",
1485 ".mid.midi", "audio/midi",
1486 ".mp3", "audio/mpeg",
1487 #if 0 /* unpopular */
1488 ".au", "audio/basic",
1489 ".pac", "application/x-ns-proxy-autoconfig",
1490 ".vrml.wrl", "model/vrml",
1497 const char *const *table;
1498 const char *try_suffix;
1500 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1504 suffix = strrchr(url, '.');
1506 /* If not found, set default as "application/octet-stream"; */
1507 found_mime_type = "application/octet-stream";
1509 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1512 for (table = suffixTable; *table; table += 2) {
1513 try_suffix = strstr(table[0], suffix);
1515 try_suffix += strlen(suffix);
1516 if (*try_suffix == '\0' || *try_suffix == '.') {
1517 found_mime_type = table[1];
1522 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1523 for (cur = mime_a; cur; cur = cur->next) {
1524 if (strcmp(cur->before_colon, suffix) == 0) {
1525 found_mime_type = cur->after_colon;
1533 bb_error_msg("sending file '%s' content-type: %s",
1534 url, found_mime_type);
1536 f = open(url, O_RDONLY);
1539 bb_perror_msg("cannot open '%s'", url);
1541 send_headers_and_exit(HTTP_NOT_FOUND);
1543 #if ENABLE_FEATURE_HTTPD_RANGES
1545 range_start = 0; /* err pages and ranges don't mix */
1546 range_len = MAXINT(off_t);
1549 range_end = file_size - 1;
1551 if (range_end < range_start
1552 || lseek(f, range_start, SEEK_SET) != range_start
1554 lseek(f, 0, SEEK_SET);
1557 range_len = range_end - range_start + 1;
1558 send_headers(HTTP_PARTIAL_CONTENT);
1565 send_headers(HTTP_OK);
1567 /* If you want to know about EPIPE below
1568 * (happens if you abort downloads from local httpd): */
1569 signal(SIGPIPE, SIG_IGN);
1571 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1572 offset = range_start;
1574 /* sz is rounded down to 64k */
1575 ssize_t sz = MAXINT(ssize_t) - 0xffff;
1576 USE_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1577 count = sendfile(1, f, &offset, sz);
1579 if (offset == range_start)
1583 USE_FEATURE_HTTPD_RANGES(range_len -= sz;)
1584 } while (count > 0 && range_len);
1589 while ((count = safe_read(f, iobuf, IOBUF_SIZE)) > 0) {
1591 USE_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1592 n = full_write(1, iobuf, count);
1595 USE_FEATURE_HTTPD_RANGES(range_len -= count;)
1599 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1602 if (count < 0 && verbose > 1)
1603 bb_perror_msg("error");
1607 static int checkPermIP(void)
1611 /* This could stand some work */
1612 for (cur = ip_a_d; cur; cur = cur->next) {
1615 "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1617 (unsigned char)(cur->ip >> 24),
1618 (unsigned char)(cur->ip >> 16),
1619 (unsigned char)(cur->ip >> 8),
1620 (unsigned char)(cur->ip),
1621 (unsigned char)(cur->mask >> 24),
1622 (unsigned char)(cur->mask >> 16),
1623 (unsigned char)(cur->mask >> 8),
1624 (unsigned char)(cur->mask)
1627 if ((rmt_ip & cur->mask) == cur->ip)
1628 return cur->allow_deny == 'A'; /* Allow/Deny */
1631 /* if unconfigured, return 1 - access from all */
1632 return !flg_deny_all;
1635 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1637 * Check the permission file for access password protected.
1639 * If config file isn't present, everything is allowed.
1640 * Entries are of the form you can see example from header source
1642 * path The file path.
1643 * request User information to validate.
1645 * Returns 1 if request is OK.
1647 static int checkPerm(const char *path, const char *request)
1653 const char *prev = NULL;
1655 /* This could stand some work */
1656 for (cur = g_auth; cur; cur = cur->next) {
1659 p0 = cur->before_colon;
1660 if (prev != NULL && strcmp(prev, p0) != 0)
1661 continue; /* find next identical */
1662 p = cur->after_colon;
1664 fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
1667 if (strncmp(p0, path, l) == 0
1668 && (l == 1 || path[l] == '/' || path[l] == '\0')
1671 /* path match found. Check request */
1672 /* for check next /path:user:password */
1674 u = strchr(request, ':');
1676 /* bad request, ':' required */
1680 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1684 if (strncmp(p, request, u - request) != 0) {
1685 /* user doesn't match */
1688 pp = strchr(p, ':');
1689 if (pp && pp[1] == '$' && pp[2] == '1'
1690 && pp[3] == '$' && pp[4]
1693 cipher = pw_encrypt(u+1, pp);
1694 if (strcmp(cipher, pp) == 0)
1695 goto set_remoteuser_var; /* Ok */
1701 if (strcmp(p, request) == 0) {
1703 remoteuser = strdup(request);
1705 remoteuser[u - request] = '\0';
1712 return prev == NULL;
1714 #endif /* FEATURE_HTTPD_BASIC_AUTH */
1716 #if ENABLE_FEATURE_HTTPD_PROXY
1717 static Htaccess_Proxy *find_proxy_entry(const char *url)
1720 for (p = proxy; p; p = p->next) {
1721 if (strncmp(url, p->url_from, strlen(p->url_from)) == 0)
1731 static void exit_on_signal(int sig) ATTRIBUTE_NORETURN;
1732 static void exit_on_signal(int sig)
1734 send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1738 * Handle an incoming http request and exit.
1740 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) ATTRIBUTE_NORETURN;
1741 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1743 static const char request_GET[] ALIGN1 = "GET";
1750 #if ENABLE_FEATURE_HTTPD_CGI
1751 const char *prequest;
1752 char *cookie = NULL;
1753 char *content_type = NULL;
1754 unsigned long length = 0;
1755 #elif ENABLE_FEATURE_HTTPD_PROXY
1756 #define prequest request_GET
1757 unsigned long length = 0;
1759 char http_major_version;
1760 #if ENABLE_FEATURE_HTTPD_PROXY
1761 char http_minor_version;
1762 char *header_buf = header_buf; /* for gcc */
1763 char *header_ptr = header_ptr;
1764 Htaccess_Proxy *proxy_entry;
1766 struct sigaction sa;
1767 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1768 int credentials = -1; /* if not required this is Ok */
1771 /* Allocation of iobuf is postponed until now
1772 * (IOW, server process doesn't need to waste 8k) */
1773 iobuf = xmalloc(IOBUF_SIZE);
1776 if (fromAddr->sa.sa_family == AF_INET) {
1777 rmt_ip = ntohl(fromAddr->sin.sin_addr.s_addr);
1779 #if ENABLE_FEATURE_IPV6
1780 if (fromAddr->sa.sa_family == AF_INET6
1781 && fromAddr->sin6.sin6_addr.s6_addr32[0] == 0
1782 && fromAddr->sin6.sin6_addr.s6_addr32[1] == 0
1783 && ntohl(fromAddr->sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1784 rmt_ip = ntohl(fromAddr->sin6.sin6_addr.s6_addr32[3]);
1786 if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1787 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->sa);
1790 /* this trick makes -v logging much simpler */
1791 applet_name = rmt_ip_str;
1793 bb_error_msg("connected");
1796 /* Install timeout handler */
1797 memset(&sa, 0, sizeof(sa));
1798 sa.sa_handler = exit_on_signal;
1799 /* sigemptyset(&sa.sa_mask); - memset should be enough */
1800 /*sa.sa_flags = 0; - no SA_RESTART */
1801 sigaction(SIGALRM, &sa, NULL);
1802 alarm(HEADER_READ_TIMEOUT);
1804 if (!get_line()) /* EOF or error or empty line */
1805 send_headers_and_exit(HTTP_BAD_REQUEST);
1807 /* Determine type of request (GET/POST) */
1808 urlp = strpbrk(iobuf, " \t");
1810 send_headers_and_exit(HTTP_BAD_REQUEST);
1812 #if ENABLE_FEATURE_HTTPD_CGI
1813 prequest = request_GET;
1814 if (strcasecmp(iobuf, prequest) != 0) {
1816 if (strcasecmp(iobuf, prequest) != 0)
1817 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1820 if (strcasecmp(iobuf, request_GET) != 0)
1821 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1823 urlp = skip_whitespace(urlp);
1825 send_headers_and_exit(HTTP_BAD_REQUEST);
1827 /* Find end of URL and parse HTTP version, if any */
1828 http_major_version = '0';
1829 USE_FEATURE_HTTPD_PROXY(http_minor_version = '0';)
1830 tptr = strchrnul(urlp, ' ');
1831 /* Is it " HTTP/"? */
1832 if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) {
1833 http_major_version = tptr[6];
1834 USE_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];)
1838 /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
1839 urlcopy = alloca((tptr - urlp) + sizeof("/index.html"));
1840 /*if (urlcopy == NULL)
1841 * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
1842 strcpy(urlcopy, urlp);
1843 /* NB: urlcopy ptr is never changed after this */
1845 /* Extract url args if present */
1847 tptr = strchr(urlcopy, '?');
1853 /* Decode URL escape sequences */
1854 tptr = decodeString(urlcopy, 0);
1856 send_headers_and_exit(HTTP_BAD_REQUEST);
1857 if (tptr == urlcopy + 1) {
1858 /* '/' or NUL is encoded */
1859 send_headers_and_exit(HTTP_NOT_FOUND);
1862 /* Canonicalize path */
1863 /* Algorithm stolen from libbb bb_simplify_path(),
1864 * but don't strdup and reducing trailing slash and protect out root */
1865 urlp = tptr = urlcopy;
1868 /* skip duplicate (or initial) slash */
1873 /* skip extra '.' */
1874 if (tptr[1] == '/' || !tptr[1]) {
1877 /* '..': be careful */
1878 if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
1880 if (urlp == urlcopy) /* protect root */
1881 send_headers_and_exit(HTTP_BAD_REQUEST);
1882 while (*--urlp != '/') /* omit previous dir */;
1889 *++urlp = '\0'; /* so keep last character */
1890 tptr = urlp; /* end ptr */
1892 /* If URL is a directory, add '/' */
1893 if (tptr[-1] != '/') {
1894 if (is_directory(urlcopy + 1, 1, &sb)) {
1895 found_moved_temporarily = urlcopy;
1901 bb_error_msg("url:%s", urlcopy);
1904 ip_allowed = checkPermIP();
1905 while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
1906 /* have path1/path2 */
1908 if (is_directory(urlcopy + 1, 1, &sb)) {
1909 /* may be having subdir config */
1910 parse_conf(urlcopy + 1, SUBDIR_PARSE);
1911 ip_allowed = checkPermIP();
1916 #if ENABLE_FEATURE_HTTPD_PROXY
1917 proxy_entry = find_proxy_entry(urlcopy);
1919 header_buf = header_ptr = xmalloc(IOBUF_SIZE);
1922 if (http_major_version >= '0') {
1923 /* Request was with "... HTTP/nXXX", and n >= 0 */
1925 /* Read until blank line for HTTP version specified, else parse immediate */
1927 alarm(HEADER_READ_TIMEOUT);
1929 break; /* EOF or error or empty line */
1931 bb_error_msg("header: '%s'", iobuf);
1933 #if ENABLE_FEATURE_HTTPD_PROXY
1934 /* We need 2 more bytes for yet another "\r\n" -
1935 * see near fdprintf(proxy_fd...) further below */
1936 if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) {
1937 int len = strlen(iobuf);
1938 if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4)
1939 len = IOBUF_SIZE - (header_ptr - header_buf) - 4;
1940 memcpy(header_ptr, iobuf, len);
1942 header_ptr[0] = '\r';
1943 header_ptr[1] = '\n';
1948 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1949 /* Try and do our best to parse more lines */
1950 if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
1951 /* extra read only for POST */
1952 if (prequest != request_GET) {
1953 tptr = iobuf + sizeof("Content-length:") - 1;
1955 send_headers_and_exit(HTTP_BAD_REQUEST);
1957 /* not using strtoul: it ignores leading minus! */
1958 length = strtol(tptr, &tptr, 10);
1959 /* length is "ulong", but we need to pass it to int later */
1960 /* so we check for negative or too large values in one go: */
1961 /* (long -> ulong conv caused negatives to be seen as > INT_MAX) */
1962 if (tptr[0] || errno || length > INT_MAX)
1963 send_headers_and_exit(HTTP_BAD_REQUEST);
1967 #if ENABLE_FEATURE_HTTPD_CGI
1968 else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
1969 cookie = strdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
1970 } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
1971 content_type = strdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
1972 } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
1973 referer = strdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
1974 } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
1975 user_agent = strdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
1978 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1979 if (STRNCASECMP(iobuf, "Authorization:") == 0) {
1980 /* We only allow Basic credentials.
1981 * It shows up as "Authorization: Basic <userid:password>" where
1982 * the userid:password is base64 encoded.
1984 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
1985 if (STRNCASECMP(tptr, "Basic") != 0)
1987 tptr += sizeof("Basic")-1;
1988 /* decodeBase64() skips whitespace itself */
1990 credentials = checkPerm(urlcopy, tptr);
1992 #endif /* FEATURE_HTTPD_BASIC_AUTH */
1993 #if ENABLE_FEATURE_HTTPD_RANGES
1994 if (STRNCASECMP(iobuf, "Range:") == 0) {
1995 /* We know only bytes=NNN-[MMM] */
1996 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
1997 if (strncmp(s, "bytes=", 6) == 0) {
1998 s += sizeof("bytes=")-1;
1999 range_start = BB_STRTOOFF(s, &s, 10);
2000 if (s[0] != '-' || range_start < 0) {
2003 range_end = BB_STRTOOFF(s+1, NULL, 10);
2004 if (errno || range_end < range_start)
2010 } /* while extra header reading */
2013 /* We are done reading headers, disable peer timeout */
2016 if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || ip_allowed == 0) {
2017 /* protect listing [/path]/httpd_conf or IP deny */
2018 send_headers_and_exit(HTTP_FORBIDDEN);
2021 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2022 if (credentials <= 0 && checkPerm(urlcopy, ":") == 0) {
2023 send_headers_and_exit(HTTP_UNAUTHORIZED);
2027 if (found_moved_temporarily) {
2028 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
2031 #if ENABLE_FEATURE_HTTPD_PROXY
2032 if (proxy_entry != NULL) {
2034 len_and_sockaddr *lsa;
2036 proxy_fd = socket(AF_INET, SOCK_STREAM, 0);
2038 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2039 lsa = host2sockaddr(proxy_entry->host_port, 80);
2041 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2042 if (connect(proxy_fd, &lsa->sa, lsa->len) < 0)
2043 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2044 fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n",
2045 prequest, /* GET or POST */
2046 proxy_entry->url_to, /* url part 1 */
2047 urlcopy + strlen(proxy_entry->url_from), /* url part 2 */
2048 (g_query ? "?" : ""), /* "?" (maybe) */
2049 (g_query ? g_query : ""), /* query string (maybe) */
2050 http_major_version, http_minor_version);
2051 header_ptr[0] = '\r';
2052 header_ptr[1] = '\n';
2054 write(proxy_fd, header_buf, header_ptr - header_buf);
2055 free(header_buf); /* on the order of 8k, free it */
2056 /* cgi_io_loop_and_exit needs to have two disctinct fds */
2057 cgi_io_loop_and_exit(proxy_fd, dup(proxy_fd), length);
2061 tptr = urlcopy + 1; /* skip first '/' */
2063 #if ENABLE_FEATURE_HTTPD_CGI
2064 if (strncmp(tptr, "cgi-bin/", 8) == 0) {
2065 if (tptr[8] == '\0') {
2066 /* protect listing "cgi-bin/" */
2067 send_headers_and_exit(HTTP_FORBIDDEN);
2069 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2071 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
2073 char *suffix = strrchr(tptr, '.');
2076 for (cur = script_i; cur; cur = cur->next) {
2077 if (strcmp(cur->before_colon + 1, suffix) == 0) {
2078 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2084 if (prequest != request_GET) {
2085 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2087 #endif /* FEATURE_HTTPD_CGI */
2089 if (urlp[-1] == '/')
2090 strcpy(urlp, "index.html");
2091 if (stat(tptr, &sb) == 0) {
2092 file_size = sb.st_size;
2093 last_mod = sb.st_mtime;
2095 #if ENABLE_FEATURE_HTTPD_CGI
2096 else if (urlp[-1] == '/') {
2097 /* It's a dir URL and there is no index.html
2098 * Try cgi-bin/index.cgi */
2099 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
2102 send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
2107 * fall through to send_file, it errors out if open fails
2111 send_file_and_exit(tptr, TRUE);
2115 * The main http server function.
2116 * Given a socket, listen for new connections and farm out
2117 * the processing as a [v]forked process.
2121 static void mini_httpd(int server_socket) ATTRIBUTE_NORETURN;
2122 static void mini_httpd(int server_socket)
2124 /* NB: it's best to not use xfuncs in this loop before fork().
2125 * Otherwise server may die on transient errors (temporary
2126 * out-of-memory condition, etc), which is Bad(tm).
2127 * Try to do any dangerous calls after fork.
2131 len_and_sockaddr fromAddr;
2133 /* Wait for connections... */
2134 fromAddr.len = LSA_SIZEOF_SA;
2135 n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
2139 /* set the KEEPALIVE option to cull dead connections */
2140 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2144 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2145 /* Do not reload config on HUP */
2146 signal(SIGHUP, SIG_IGN);
2148 close(server_socket);
2152 handle_incoming_and_exit(&fromAddr);
2154 /* parent, or fork failed */
2160 static void mini_httpd_nommu(int server_socket, int argc, char **argv) ATTRIBUTE_NORETURN;
2161 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2163 char *argv_copy[argc + 2];
2165 argv_copy[0] = argv[0];
2166 argv_copy[1] = (char*)"-i";
2167 memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2169 /* NB: it's best to not use xfuncs in this loop before vfork().
2170 * Otherwise server may die on transient errors (temporary
2171 * out-of-memory condition, etc), which is Bad(tm).
2172 * Try to do any dangerous calls after fork.
2176 len_and_sockaddr fromAddr;
2178 /* Wait for connections... */
2179 fromAddr.len = LSA_SIZEOF_SA;
2180 n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
2184 /* set the KEEPALIVE option to cull dead connections */
2185 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2189 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2190 /* Do not reload config on HUP */
2191 signal(SIGHUP, SIG_IGN);
2193 close(server_socket);
2197 /* Run a copy of ourself in inetd mode */
2200 /* parent, or vfork failed */
2208 * Process a HTTP connection on stdin/out.
2211 static void mini_httpd_inetd(void) ATTRIBUTE_NORETURN;
2212 static void mini_httpd_inetd(void)
2214 len_and_sockaddr fromAddr;
2216 fromAddr.len = LSA_SIZEOF_SA;
2217 getpeername(0, &fromAddr.sa, &fromAddr.len);
2218 handle_incoming_and_exit(&fromAddr);
2221 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2222 static void sighup_handler(int sig)
2224 struct sigaction sa;
2226 parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
2228 memset(&sa, 0, sizeof(sa));
2229 sa.sa_handler = sighup_handler;
2230 /*sigemptyset(&sa.sa_mask); - memset should be enough */
2231 sa.sa_flags = SA_RESTART;
2232 sigaction(SIGHUP, &sa, NULL);
2237 c_opt_config_file = 0,
2240 USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2241 USE_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,)
2242 USE_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,)
2243 USE_FEATURE_HTTPD_SETUID( u_opt_setuid ,)
2248 OPT_CONFIG_FILE = 1 << c_opt_config_file,
2249 OPT_DECODE_URL = 1 << d_opt_decode_url,
2250 OPT_HOME_HTTPD = 1 << h_opt_home_httpd,
2251 OPT_ENCODE_URL = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2252 OPT_REALM = USE_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0,
2253 OPT_MD5 = USE_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0,
2254 OPT_SETUID = USE_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0,
2255 OPT_PORT = 1 << p_opt_port,
2256 OPT_INETD = 1 << p_opt_inetd,
2257 OPT_FOREGROUND = 1 << p_opt_foreground,
2258 OPT_VERBOSE = 1 << p_opt_verbose,
2262 int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2263 int httpd_main(int argc, char **argv)
2265 int server_socket = server_socket; /* for gcc */
2267 char *url_for_decode;
2268 USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2269 USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2270 USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2271 USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2275 #if ENABLE_LOCALE_SUPPORT
2276 /* Undo busybox.c: we want to speak English in http (dates etc) */
2277 setlocale(LC_TIME, "C");
2280 home_httpd = xrealloc_getcwd_or_warn(NULL);
2281 /* -v counts, -i implies -f */
2282 opt_complementary = "vv:if";
2283 /* We do not "absolutize" path given by -h (home) opt.
2284 * If user gives relative path in -h, $SCRIPT_FILENAME can end up
2286 opt = getopt32(argv, "c:d:h:"
2287 USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2288 USE_FEATURE_HTTPD_BASIC_AUTH("r:")
2289 USE_FEATURE_HTTPD_AUTH_MD5("m:")
2290 USE_FEATURE_HTTPD_SETUID("u:")
2292 &configFile, &url_for_decode, &home_httpd
2293 USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2294 USE_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2295 USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
2296 USE_FEATURE_HTTPD_SETUID(, &s_ugid)
2297 , &bind_addr_or_port
2300 if (opt & OPT_DECODE_URL) {
2301 fputs(decodeString(url_for_decode, 1), stdout);
2304 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2305 if (opt & OPT_ENCODE_URL) {
2306 fputs(encodeString(url_for_encode), stdout);
2310 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2311 if (opt & OPT_MD5) {
2312 puts(pw_encrypt(pass, "$1$"));
2316 #if ENABLE_FEATURE_HTTPD_SETUID
2317 if (opt & OPT_SETUID) {
2318 if (!get_uidgid(&ugid, s_ugid, 1))
2319 bb_error_msg_and_die("unrecognized user[:group] "
2320 "name '%s'", s_ugid);
2325 if (!(opt & OPT_FOREGROUND)) {
2326 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2331 if (!(opt & OPT_INETD)) {
2332 signal(SIGCHLD, SIG_IGN);
2333 server_socket = openServer();
2334 #if ENABLE_FEATURE_HTTPD_SETUID
2335 /* drop privileges */
2336 if (opt & OPT_SETUID) {
2337 if (ugid.gid != (gid_t)-1) {
2338 if (setgroups(1, &ugid.gid) == -1)
2339 bb_perror_msg_and_die("setgroups");
2347 #if 0 /*was #if ENABLE_FEATURE_HTTPD_CGI*/
2348 /* User can do it himself: 'env - PATH="$PATH" httpd'
2349 * We don't do it because we don't want to screw users
2351 * 'env - VAR1=val1 VAR2=val2 httpd'
2352 * and have VAR1 and VAR2 values visible in their CGIs.
2353 * Besides, it is also smaller. */
2355 char *p = getenv("PATH");
2356 /* env strings themself are not freed, no need to strdup(p): */
2360 // if (!(opt & OPT_INETD))
2361 // setenv_long("SERVER_PORT", ???);
2365 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2366 if (!(opt & OPT_INETD))
2368 else /* do not install HUP handler in inetd mode */
2370 parse_conf(default_path_httpd_conf, FIRST_PARSE);
2372 xfunc_error_retval = 0;
2373 if (opt & OPT_INETD)
2376 if (!(opt & OPT_FOREGROUND))
2377 bb_daemonize(0); /* don't change current directory */
2378 mini_httpd(server_socket); /* never returns */
2380 mini_httpd_nommu(server_socket, argc, argv); /* never returns */