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
46 * /cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/
47 * /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/
48 * /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/
49 * .au:audio/basic # additional mime type for audio.au files
50 * *.php:/path/php # running cgi.php scripts through an interpreter
52 * A/D may be as a/d or allow/deny - first char case insensitive
53 * Deny IP rules take precedence over allow rules.
56 * The Deny/Allow IP logic:
58 * - Default is to allow all. No addresses are denied unless
59 * denied with a D: rule.
60 * - Order of Deny/Allow rules is significant
61 * - Deny rules take precedence over allow rules.
62 * - If a deny all rule (D:*) is used it acts as a catch-all for unmatched
64 * - Specification of Allow all (A:*) is a no-op
67 * 1. Allow only specified addresses
68 * A:172.20 # Allow any address that begins with 172.20.
69 * A:10.10. # Allow any address that begins with 10.10.
70 * A:127.0.0.1 # Allow local loopback connections
71 * D:* # Deny from other IP connections
73 * 2. Only deny specified addresses
74 * D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255
75 * D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255
76 * A:* # (optional line added for clarity)
78 * If a sub directory contains a config file it is parsed and merged with
79 * any existing settings as if it was appended to the original configuration.
81 * subdir paths are relative to the containing subdir and thus cannot
82 * affect the parent rules.
84 * Note that since the sub dir is parsed in the forked thread servicing the
85 * subdir http request, any merge is discarded when the process exits. As a
86 * result, the subdir settings only have a lifetime of a single request.
88 * Custom error pages can contain an absolute path or be relative to
89 * 'home_httpd'. Error pages are to be static files (no CGI or script). Error
90 * page can only be defined in the root configuration file and are not taken
91 * into account in local (directories) config files.
93 * If -c is not set, an attempt will be made to open the default
94 * root configuration file. If -c is set and the file is not found, the
95 * server exits with an error.
100 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
101 #include <sys/sendfile.h>
107 #define IOBUF_SIZE 8192 /* IO buffer */
109 /* amount of buffering in a pipe */
111 # define PIPE_BUF 4096
113 #if PIPE_BUF >= IOBUF_SIZE
114 # error "PIPE_BUF >= IOBUF_SIZE"
117 #define HEADER_READ_TIMEOUT 60
119 static const char default_path_httpd_conf[] ALIGN1 = "/etc";
120 static const char httpd_conf[] ALIGN1 = "httpd.conf";
121 static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
123 typedef struct has_next_ptr {
124 struct has_next_ptr *next;
127 /* Must have "next" as a first member */
128 typedef struct Htaccess {
129 struct Htaccess *next;
131 char before_colon[1]; /* really bigger, must be last */
134 /* Must have "next" as a first member */
135 typedef struct Htaccess_IP {
136 struct Htaccess_IP *next;
144 HTTP_PARTIAL_CONTENT = 206,
145 HTTP_MOVED_TEMPORARILY = 302,
146 HTTP_BAD_REQUEST = 400, /* malformed syntax */
147 HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
148 HTTP_NOT_FOUND = 404,
149 HTTP_FORBIDDEN = 403,
150 HTTP_REQUEST_TIMEOUT = 408,
151 HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */
152 HTTP_INTERNAL_SERVER_ERROR = 500,
154 #if 0 /* future use */
155 HTTP_SWITCHING_PROTOCOLS = 101,
158 HTTP_NON_AUTHORITATIVE_INFO = 203,
159 HTTP_NO_CONTENT = 204,
160 HTTP_MULTIPLE_CHOICES = 300,
161 HTTP_MOVED_PERMANENTLY = 301,
162 HTTP_NOT_MODIFIED = 304,
163 HTTP_PAYMENT_REQUIRED = 402,
164 HTTP_BAD_GATEWAY = 502,
165 HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
166 HTTP_RESPONSE_SETSIZE = 0xffffffff
170 static const uint16_t http_response_type[] ALIGN2 = {
172 #if ENABLE_FEATURE_HTTPD_RANGES
173 HTTP_PARTIAL_CONTENT,
175 HTTP_MOVED_TEMPORARILY,
176 HTTP_REQUEST_TIMEOUT,
177 HTTP_NOT_IMPLEMENTED,
178 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
184 HTTP_INTERNAL_SERVER_ERROR,
185 #if 0 /* not implemented */
189 HTTP_MULTIPLE_CHOICES,
190 HTTP_MOVED_PERMANENTLY,
193 HTTP_SERVICE_UNAVAILABLE,
197 static const struct {
200 } http_response[ARRAY_SIZE(http_response_type)] = {
202 #if ENABLE_FEATURE_HTTPD_RANGES
203 { "Partial Content", NULL },
206 { "Request Timeout", "No request appeared within 60 seconds" },
207 { "Not Implemented", "The requested method is not recognized" },
208 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
209 { "Unauthorized", "" },
211 { "Not Found", "The requested URL was not found" },
212 { "Bad Request", "Unsupported method" },
214 { "Internal Server Error", "Internal Server Error" },
215 #if 0 /* not implemented */
219 { "Multiple Choices" },
220 { "Moved Permanently" },
222 { "Bad Gateway", "" },
223 { "Service Unavailable", "" },
229 int verbose; /* must be int (used by getopt32) */
230 smallint flg_deny_all;
232 unsigned rmt_ip; /* used for IP-based allow/deny rules */
234 char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */
235 const char *bind_addr_or_port;
238 const char *configFile;
239 const char *home_httpd;
241 const char *found_mime_type;
242 const char *found_moved_temporarily;
243 Htaccess_IP *ip_a_d; /* config allow/deny lines */
245 USE_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
246 USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
247 USE_FEATURE_HTTPD_CGI(char *referer;)
248 USE_FEATURE_HTTPD_CGI(char *user_agent;)
250 off_t file_size; /* -1 - unknown */
251 #if ENABLE_FEATURE_HTTPD_RANGES
257 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
258 Htaccess *g_auth; /* config user:password lines */
260 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
261 Htaccess *mime_a; /* config mime types */
263 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
264 Htaccess *script_i; /* config script interpreters */
266 char *iobuf; /* [IOBUF_SIZE] */
267 #define hdr_buf bb_common_bufsiz1
270 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
271 const char *http_error_page[ARRAY_SIZE(http_response_type)];
274 #define G (*ptr_to_globals)
275 #define verbose (G.verbose )
276 #define flg_deny_all (G.flg_deny_all )
277 #define rmt_ip (G.rmt_ip )
278 #define bind_addr_or_port (G.bind_addr_or_port)
279 #define g_query (G.g_query )
280 #define configFile (G.configFile )
281 #define home_httpd (G.home_httpd )
282 #define found_mime_type (G.found_mime_type )
283 #define found_moved_temporarily (G.found_moved_temporarily)
284 #define last_mod (G.last_mod )
285 #define ip_a_d (G.ip_a_d )
286 #define g_realm (G.g_realm )
287 #define remoteuser (G.remoteuser )
288 #define referer (G.referer )
289 #define user_agent (G.user_agent )
290 #define file_size (G.file_size )
291 #if ENABLE_FEATURE_HTTPD_RANGES
292 #define range_start (G.range_start )
293 #define range_end (G.range_end )
294 #define range_len (G.range_len )
296 #define rmt_ip_str (G.rmt_ip_str )
297 #define g_auth (G.g_auth )
298 #define mime_a (G.mime_a )
299 #define script_i (G.script_i )
300 #define iobuf (G.iobuf )
301 #define hdr_ptr (G.hdr_ptr )
302 #define hdr_cnt (G.hdr_cnt )
303 #define http_error_page (G.http_error_page )
304 #define INIT_G() do { \
305 PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
306 USE_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
307 bind_addr_or_port = "80"; \
311 #if !ENABLE_FEATURE_HTTPD_RANGES
314 range_end = MAXINT(off_t) - 1,
315 range_len = MAXINT(off_t),
320 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
323 static void send_file_and_exit(const char *url, int headers) ATTRIBUTE_NORETURN;
325 static void free_llist(has_next_ptr **pptr)
327 has_next_ptr *cur = *pptr;
329 has_next_ptr *t = cur;
336 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
337 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
338 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
339 static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
341 free_llist((has_next_ptr**)pptr);
345 static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
347 free_llist((has_next_ptr**)pptr);
350 /* Returns presumed mask width in bits or < 0 on error.
351 * Updates strp, stores IP at provided pointer */
352 static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
354 const char *p = *strp;
362 for (j = 0; j < 4; j++) {
365 if ((*p < '0' || *p > '9') && *p != '/' && *p)
368 while (*p >= '0' && *p <= '9') {
379 ip = (ip << 8) | octet;
393 /* Returns 0 on success. Stores IP and mask at provided pointers */
394 static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
400 i = scan_ip(&str, ipp, '/');
405 /* there is /xxx after dotted-IP address */
406 i = bb_strtou(str, &p, 10);
408 /* 'xxx' itself is dotted-IP mask, parse it */
409 /* (return 0 (success) only if it has N.N.N.N form) */
410 return scan_ip(&str, maskp, '\0') - 32;
419 if (sizeof(unsigned) == 4 && i == 32) {
420 /* mask >>= 32 below may not work */
426 /* i == 0 -> *maskp = 0x00000000
427 * i == 1 -> *maskp = 0x80000000
428 * i == 4 -> *maskp = 0xf0000000
429 * i == 31 -> *maskp = 0xfffffffe
430 * i == 32 -> *maskp = 0xffffffff */
431 *maskp = (uint32_t)(~mask);
436 * Parse configuration file into in-memory linked list.
438 * The first non-white character is examined to determine if the config line
439 * is one of the following:
440 * .ext:mime/type # new mime type not compiled into httpd
441 * [adAD]:from # ip address allow/deny, * for wildcard
442 * /path:user:pass # username/password
443 * Ennn:error.html # error page for status nnn
445 * Any previous IP rules are discarded.
446 * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
447 * are also discarded. That is, previous settings are retained if flag is
449 * Error pages are only parsed on the main config file.
451 * path Path where to look for httpd.conf (without filename).
452 * flag Type of the parse request.
455 #define FIRST_PARSE 0
456 #define SUBDIR_PARSE 1
457 #define SIGNALED_PARSE 2
458 #define FIND_FROM_HTTPD_ROOT 3
459 static void parse_conf(const char *path, int flag)
462 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
465 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
466 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
467 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
470 const char *cf = configFile;
476 /* discard old rules */
477 free_Htaccess_IP_list(&ip_a_d);
479 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
480 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
481 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
482 /* retain previous auth and mime config only for subdir parse */
483 if (flag != SUBDIR_PARSE) {
484 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
485 free_Htaccess_list(&g_auth);
487 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
488 free_Htaccess_list(&mime_a);
490 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
491 free_Htaccess_list(&script_i);
496 if (flag == SUBDIR_PARSE || cf == NULL) {
497 cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
498 sprintf((char *)cf, "%s/%s", path, httpd_conf);
501 while ((f = fopen(cf, "r")) == NULL) {
502 if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
503 /* config file not found, no changes to config */
506 if (configFile && flag == FIRST_PARSE) /* if -c option given */
507 bb_simple_perror_msg_and_die(cf);
508 flag = FIND_FROM_HTTPD_ROOT;
512 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
515 /* This could stand some work */
516 while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
518 for (p = p0; *p0 != '\0' && *p0 != '#'; p0++) {
521 if (*p0 == ':' && c == NULL)
527 /* test for empty or strange line */
528 if (c == NULL || *c == '\0')
535 /* memorize deny all */
538 /* skip default other "word:*" config lines */
544 if (*p0 == 'A' || *p0 == 'D') {
545 /* storing current config IP line */
546 pip = xzalloc(sizeof(Htaccess_IP));
548 if (scan_ip_mask(c, &(pip->ip), &(pip->mask))) {
549 /* syntax IP{/mask} error detected, protect all */
553 pip->allow_deny = *p0;
555 /* Deny:from_IP move top */
559 /* add to bottom A:form_IP config line */
560 Htaccess_IP *prev_IP = ip_a_d;
562 if (prev_IP == NULL) {
565 while (prev_IP->next)
566 prev_IP = prev_IP->next;
574 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
575 if (flag == FIRST_PARSE && *p0 == 'E') {
577 /* error status code */
578 int status = atoi(++p0);
579 /* c already points at the character following ':' in parse loop */
580 /* c = strchr(p0, ':'); c++; */
581 if (status < HTTP_CONTINUE) {
582 bb_error_msg("config error '%s' in '%s'", buf, cf);
586 /* then error page; find matching status */
587 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
588 if (http_response_type[i] == status) {
589 http_error_page[i] = concat_path_file((*c == '/') ? NULL : home_httpd, c);
597 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
599 /* make full path from httpd root / current_path / config_line_path */
600 cf = (flag == SUBDIR_PARSE ? path : "");
601 p0 = xmalloc(strlen(cf) + (c - buf) + 2 + strlen(c));
603 sprintf(p0, "/%s%s", cf, buf);
605 /* another call bb_simplify_path */
610 if (*cf == '/') { /* skip duplicate (or initial) slash */
614 if (cf[1] == '/' || cf[1] == '\0') { /* remove extra '.' */
617 if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == '\0')) {
620 while (*--p != '/') /* omit previous dir */;
629 if ((p == p0) || (*p != '/')) { /* not a trailing slash */
630 ++p; /* so keep last character */
637 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
638 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
639 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
640 /* storing current config line */
641 cur = xzalloc(sizeof(Htaccess) + strlen(p0));
643 cf = strcpy(cur->before_colon, p0);
646 cur->after_colon = c;
647 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
649 /* config .mime line move top for overwrite previous */
655 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
656 if (*cf == '*' && cf[1] == '.') {
657 /* config script interpreter line move top for overwrite previous */
658 cur->next = script_i;
663 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
669 /* sort path, if current lenght eq or bigger then move up */
670 Htaccess *prev_hti = g_auth;
671 size_t l = strlen(cf);
674 for (hti = prev_hti; hti; hti = hti->next) {
675 if (l >= strlen(hti->before_colon)) {
676 /* insert before hti */
678 if (prev_hti != hti) {
679 prev_hti->next = cur;
687 prev_hti = prev_hti->next;
689 if (!hti) { /* not inserted, add to bottom */
701 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
703 * Given a string, html-encode special characters.
704 * This is used for the -e command line option to provide an easy way
705 * for scripts to encode result data without confusing browsers. The
706 * returned string pointer is memory allocated by malloc().
708 * Returns a pointer to the encoded string (malloced).
710 static char *encodeString(const char *string)
712 /* take the simple route and encode everything */
713 /* could possibly scan once to get length. */
714 int len = strlen(string);
715 char *out = xmalloc(len * 6 + 1);
719 while ((ch = *string++)) {
720 /* very simple check for what to encode */
724 p += sprintf(p, "&#%d;", (unsigned char) ch);
729 #endif /* FEATURE_HTTPD_ENCODE_URL_STR */
732 * Given a URL encoded string, convert it to plain ascii.
733 * Since decoding always makes strings smaller, the decode is done in-place.
734 * Thus, callers should strdup() the argument if they do not want the
735 * argument modified. The return is the original pointer, allowing this
736 * function to be easily used as arguments to other functions.
738 * string The first string to decode.
739 * option_d 1 if called for httpd -d
741 * Returns a pointer to the decoded string (same as input).
743 static unsigned hex_to_bin(unsigned char c)
750 /* c | 0x20: letters to lower case, non-letters
751 * to (potentially different) non-letters */
752 v = (unsigned)(c | 0x20) - 'a';
758 void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
759 int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
760 t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
762 static char *decodeString(char *orig, int option_d)
764 /* note that decoded string is always shorter than original */
769 while ((c = *ptr++) != '\0') {
772 if (option_d && c == '+') {
780 v = hex_to_bin(ptr[0]);
788 v = (v * 16) | hex_to_bin(ptr[1]);
791 if (!option_d && (v == '/' || v == '\0')) {
792 /* caller takes it as indication of invalid
793 * (dangerous wrt exploits) chars */
803 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
805 * Decode a base64 data stream as per rfc1521.
806 * Note that the rfc states that non base64 chars are to be ignored.
807 * Since the decode always results in a shorter size than the input,
808 * it is OK to pass the input arg as an output arg.
809 * Parameter: a pointer to a base64 encoded string.
810 * Decoded data is stored in-place.
812 static void decodeBase64(char *Data)
814 const unsigned char *in = (const unsigned char *)Data;
815 /* The decoded size will be at most 3/4 the size of the encoded */
822 if (t >= '0' && t <= '9')
824 else if (t >= 'A' && t <= 'Z')
826 else if (t >= 'a' && t <= 'z')
840 *Data++ = (char) (ch >> 16);
841 *Data++ = (char) (ch >> 8);
851 * Create a listen server socket on the designated port.
853 static int openServer(void)
855 int n = bb_strtou(bind_addr_or_port, NULL, 10);
856 if (!errno && n && n <= 0xffff)
857 n = create_and_bind_stream_or_die(NULL, n);
859 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
865 * Log the connection closure and exit.
867 static void log_and_exit(void) ATTRIBUTE_NORETURN;
868 static void log_and_exit(void)
870 /* Paranoia. IE said to be buggy. It may send some extra data
871 * or be confused by us just exiting without SHUT_WR. Oh well. */
872 shutdown(1, SHUT_WR);
874 while (read(0, iobuf, IOBUF_SIZE) > 0)
878 bb_error_msg("closed");
879 _exit(xfunc_error_retval);
883 * Create and send HTTP response headers.
884 * The arguments are combined and sent as one write operation. Note that
885 * IE will puke big-time if the headers are not sent in one packet and the
886 * second packet is delayed for any reason.
887 * responseNum - the result code to send.
889 static void send_headers(int responseNum)
891 static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
893 const char *responseString = "";
894 const char *infoString = NULL;
895 const char *mime_type;
896 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
897 const char *error_page = 0;
900 time_t timer = time(0);
904 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
905 if (http_response_type[i] == responseNum) {
906 responseString = http_response[i].name;
907 infoString = http_response[i].info;
908 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
909 error_page = http_error_page[i];
914 /* error message is HTML */
915 mime_type = responseNum == HTTP_OK ?
916 found_mime_type : "text/html";
919 bb_error_msg("response:%u", responseNum);
921 /* emit the current date */
922 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
924 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
925 "Date: %s\r\nConnection: close\r\n",
926 responseNum, responseString, mime_type, tmp_str);
928 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
929 if (responseNum == HTTP_UNAUTHORIZED) {
930 len += sprintf(iobuf + len,
931 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
935 if (responseNum == HTTP_MOVED_TEMPORARILY) {
936 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
937 found_moved_temporarily,
938 (g_query ? "?" : ""),
939 (g_query ? g_query : ""));
942 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
943 if (error_page && !access(error_page, R_OK)) {
944 strcat(iobuf, "\r\n");
948 fprintf(stderr, "headers: '%s'\n", iobuf);
949 full_write(1, iobuf, len);
951 fprintf(stderr, "writing error page: '%s'\n", error_page);
952 return send_file_and_exit(error_page, FALSE);
956 if (file_size != -1) { /* file */
957 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
958 #if ENABLE_FEATURE_HTTPD_RANGES
959 if (responseNum == HTTP_PARTIAL_CONTENT) {
960 len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n",
964 file_size = range_end - range_start + 1;
967 len += sprintf(iobuf + len,
968 #if ENABLE_FEATURE_HTTPD_RANGES
969 "Accept-Ranges: bytes\r\n"
971 "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
980 len += sprintf(iobuf + len,
981 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
982 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
983 responseNum, responseString,
984 responseNum, responseString, infoString);
987 fprintf(stderr, "headers: '%s'\n", iobuf);
988 if (full_write(1, iobuf, len) != len) {
990 bb_perror_msg("error");
995 static void send_headers_and_exit(int responseNum) ATTRIBUTE_NORETURN;
996 static void send_headers_and_exit(int responseNum)
998 send_headers(responseNum);
1003 * Read from the socket until '\n' or EOF. '\r' chars are removed.
1004 * '\n' is replaced with NUL.
1005 * Return number of characters read or 0 if nothing is read
1006 * ('\r' and '\n' are not counted).
1007 * Data is returned in iobuf.
1009 static int get_line(void)
1016 hdr_cnt = safe_read(0, hdr_buf, sizeof(hdr_buf));
1021 iobuf[count] = c = *hdr_ptr++;
1027 iobuf[count] = '\0';
1030 if (count < (IOBUF_SIZE - 1)) /* check overflow */
1036 #if ENABLE_FEATURE_HTTPD_CGI
1038 /* gcc 4.2.1 fares better with NOINLINE */
1039 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) ATTRIBUTE_NORETURN;
1040 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1042 enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1043 struct pollfd pfd[3];
1044 int out_cnt; /* we buffer a bit of initial CGI output */
1047 /* iobuf is used for CGI -> network data,
1048 * hdr_buf is for network -> CGI data (POSTDATA) */
1050 /* If CGI dies, we still want to correctly finish reading its output
1051 * and send it to the peer. So please no SIGPIPEs! */
1052 signal(SIGPIPE, SIG_IGN);
1054 // We inconsistently handle a case when more POSTDATA from network
1055 // is coming than we expected. We may give *some part* of that
1056 // extra data to CGI.
1058 //if (hdr_cnt > post_len) {
1059 // /* We got more POSTDATA from network than we expected */
1060 // hdr_cnt = post_len;
1062 post_len -= hdr_cnt;
1063 /* post_len - number of POST bytes not yet read from network */
1065 /* NB: breaking out of this loop jumps to log_and_exit() */
1068 memset(pfd, 0, sizeof(pfd));
1070 pfd[FROM_CGI].fd = fromCgi_rd;
1071 pfd[FROM_CGI].events = POLLIN;
1074 pfd[TO_CGI].fd = toCgi_wr;
1076 pfd[TO_CGI].events = POLLOUT;
1077 } else if (post_len > 0) {
1078 pfd[0].events = POLLIN;
1080 /* post_len <= 0 && hdr_cnt <= 0:
1081 * no more POST data to CGI,
1082 * let CGI see EOF on CGI's stdin */
1088 /* Now wait on the set of sockets */
1089 count = safe_poll(pfd, 3, -1);
1092 if (waitpid(pid, &status, WNOHANG) <= 0) {
1093 /* Weird. CGI didn't exit and no fd's
1094 * are ready, yet poll returned?! */
1097 if (DEBUG && WIFEXITED(status))
1098 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1099 if (DEBUG && WIFSIGNALED(status))
1100 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1105 if (pfd[TO_CGI].revents) {
1106 /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */
1107 /* Have data from peer and can write to CGI */
1108 count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1109 /* Doesn't happen, we dont use nonblocking IO here
1110 *if (count < 0 && errno == EAGAIN) {
1117 /* EOF/broken pipe to CGI, stop piping POST data */
1118 hdr_cnt = post_len = 0;
1122 if (pfd[0].revents) {
1123 /* post_len > 0 && hdr_cnt == 0 here */
1124 /* We expect data, prev data portion is eaten by CGI
1125 * and there *is* data to read from the peer
1127 //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
1128 //count = safe_read(0, hdr_buf, count);
1129 count = safe_read(0, hdr_buf, sizeof(hdr_buf));
1135 /* no more POST data can be read */
1140 if (pfd[FROM_CGI].revents) {
1141 /* There is something to read from CGI */
1144 /* Are we still buffering CGI output? */
1146 /* HTTP_200[] has single "\r\n" at the end.
1147 * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1148 * CGI scripts MUST send their own header terminated by
1149 * empty line, then data. That's why we have only one
1150 * <cr><lf> pair here. We will output "200 OK" line
1151 * if needed, but CGI still has to provide blank line
1152 * between header and body */
1154 /* Must use safe_read, not full_read, because
1155 * CGI may output a few first bytes and then wait
1156 * for POSTDATA without closing stdout.
1157 * With full_read we may wait here forever. */
1158 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1160 /* eof (or error) and there was no "HTTP",
1161 * so write it, then write received data */
1163 full_write(1, HTTP_200, sizeof(HTTP_200)-1);
1164 full_write(1, rbuf, out_cnt);
1166 break; /* CGI stdout is closed, exiting */
1170 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1171 if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1172 /* send "HTTP/1.0 " */
1173 if (full_write(1, HTTP_200, 9) != 9)
1175 rbuf += 8; /* skip "Status: " */
1176 count = out_cnt - 8;
1177 out_cnt = -1; /* buffering off */
1178 } else if (out_cnt >= 4) {
1179 /* Did CGI add "HTTP"? */
1180 if (memcmp(rbuf, HTTP_200, 4) != 0) {
1181 /* there is no "HTTP", do it ourself */
1182 if (full_write(1, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1186 if (!strstr(rbuf, "ontent-")) {
1187 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1189 * Counter-example of valid CGI without Content-type:
1190 * echo -en "HTTP/1.0 302 Found\r\n"
1191 * echo -en "Location: http://www.busybox.net\r\n"
1195 out_cnt = -1; /* buffering off */
1198 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1200 break; /* eof (or error) */
1202 if (full_write(1, rbuf, count) != count)
1205 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1206 } /* if (pfd[FROM_CGI].revents) */
1211 static void setenv1(const char *name, const char *value)
1213 setenv(name, value ? value : "", 1);
1217 * Spawn CGI script, forward CGI's stdin/out <=> network
1219 * Environment variables are set up and the script is invoked with pipes
1220 * for stdin/stdout. If a POST is being done the script is fed the POST
1221 * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1224 * const char *url The requested URL (with leading /).
1225 * int post_len Length of the POST body.
1226 * const char *cookie For set HTTP_COOKIE.
1227 * const char *content_type For set CONTENT_TYPE.
1229 static void send_cgi_and_exit(
1231 const char *request,
1234 const char *content_type) ATTRIBUTE_NORETURN;
1235 static void send_cgi_and_exit(
1237 const char *request,
1240 const char *content_type)
1242 struct { int rd; int wr; } fromCgi; /* CGI -> httpd pipe */
1243 struct { int rd; int wr; } toCgi; /* httpd -> CGI pipe */
1250 * We are mucking with environment _first_ and then vfork/exec,
1251 * this allows us to use vfork safely. Parent don't care about
1252 * these environment changes anyway.
1258 purl = xstrdup(url);
1260 while ((script = strchr(script + 1, '/')) != NULL) {
1261 /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
1265 if (!is_directory(purl + 1, 1, &sb)) {
1266 /* not directory, found script.cgi/PATH_INFO */
1270 *script = '/'; /* is directory, find next '/' */
1272 setenv1("PATH_INFO", script); /* set /PATH_INFO or "" */
1273 setenv1("REQUEST_METHOD", request);
1275 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", purl, g_query));
1277 setenv1("REQUEST_URI", purl);
1280 *script = '\0'; /* cut off /PATH_INFO */
1282 /* SCRIPT_FILENAME required by PHP in CGI mode */
1283 fullpath = concat_path_file(home_httpd, purl);
1284 setenv1("SCRIPT_FILENAME", fullpath);
1285 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1286 setenv1("SCRIPT_NAME", purl);
1287 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1288 * QUERY_STRING: The information which follows the ? in the URL
1289 * which referenced this script. This is the query information.
1290 * It should not be decoded in any fashion. This variable
1291 * should always be set when there is query information,
1292 * regardless of command line decoding. */
1293 /* (Older versions of bbox seem to do some decoding) */
1294 setenv1("QUERY_STRING", g_query);
1295 putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1296 putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1297 putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1298 /* Having _separate_ variables for IP and port defeats
1299 * the purpose of having socket abstraction. Which "port"
1300 * are you using on Unix domain socket?
1301 * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1304 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1305 char *cp = strrchr(p, ':');
1306 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1308 if (cp) *cp = '\0'; /* delete :PORT */
1309 setenv1("REMOTE_ADDR", p);
1312 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1313 setenv1("REMOTE_PORT", cp + 1);
1317 setenv1("HTTP_USER_AGENT", user_agent);
1319 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1321 setenv1("HTTP_COOKIE", cookie);
1323 setenv1("CONTENT_TYPE", content_type);
1324 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1326 setenv1("REMOTE_USER", remoteuser);
1327 putenv((char*)"AUTH_TYPE=Basic");
1331 setenv1("HTTP_REFERER", referer);
1338 /* TODO: log perror? */
1344 xfunc_error_retval = 242;
1346 xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */
1347 xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */
1350 /* User seeing stderr output can be a security problem.
1351 * If CGI really wants that, it can always do dup itself. */
1354 /* script must have absolute path */
1355 script = strrchr(fullpath, '/');
1357 goto error_execing_cgi;
1359 /* chdiring to script's dir */
1360 if (chdir(fullpath) == 0) {
1362 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1363 char *interpr = NULL;
1364 char *suffix = strrchr(purl, '.');
1368 for (cur = script_i; cur; cur = cur->next) {
1369 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1370 interpr = cur->after_colon;
1377 /* set argv[0] to name without path */
1378 argv[0] = (char*)bb_basename(purl);
1380 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1382 execv(interpr, argv);
1385 execv(fullpath, argv);
1389 * (we are CGI here, our stdout is pumped to the net) */
1390 send_headers_and_exit(HTTP_NOT_FOUND);
1393 /* Parent process */
1395 /* Restore variables possibly changed by child */
1396 xfunc_error_retval = 0;
1401 cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1404 #endif /* FEATURE_HTTPD_CGI */
1407 * Send a file response to a HTTP request, and exit
1410 * const char *url The requested URL (with leading /).
1411 * headers Don't send headers before if FALSE.
1413 static void send_file_and_exit(const char *url, int headers)
1415 static const char *const suffixTable[] = {
1416 /* Warning: shorter equivalent suffix in one line must be first */
1417 ".htm.html", "text/html",
1418 ".jpg.jpeg", "image/jpeg",
1419 ".gif", "image/gif",
1420 ".png", "image/png",
1421 ".txt.h.c.cc.cpp", "text/plain",
1423 ".wav", "audio/wav",
1424 ".avi", "video/x-msvideo",
1425 ".qt.mov", "video/quicktime",
1426 ".mpe.mpeg", "video/mpeg",
1427 ".mid.midi", "audio/midi",
1428 ".mp3", "audio/mpeg",
1429 #if 0 /* unpopular */
1430 ".au", "audio/basic",
1431 ".pac", "application/x-ns-proxy-autoconfig",
1432 ".vrml.wrl", "model/vrml",
1439 const char *const *table;
1440 const char *try_suffix;
1442 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1446 suffix = strrchr(url, '.');
1448 /* If not found, set default as "application/octet-stream"; */
1449 found_mime_type = "application/octet-stream";
1451 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1454 for (table = suffixTable; *table; table += 2) {
1455 try_suffix = strstr(table[0], suffix);
1457 try_suffix += strlen(suffix);
1458 if (*try_suffix == '\0' || *try_suffix == '.') {
1459 found_mime_type = table[1];
1464 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1465 for (cur = mime_a; cur; cur = cur->next) {
1466 if (strcmp(cur->before_colon, suffix) == 0) {
1467 found_mime_type = cur->after_colon;
1475 bb_error_msg("sending file '%s' content-type: %s",
1476 url, found_mime_type);
1478 f = open(url, O_RDONLY);
1481 bb_perror_msg("cannot open '%s'", url);
1483 send_headers_and_exit(HTTP_NOT_FOUND);
1485 #if ENABLE_FEATURE_HTTPD_RANGES
1487 range_start = 0; /* err pages and ranges don't mix */
1488 range_len = MAXINT(off_t);
1491 range_end = file_size - 1;
1493 if (range_end < range_start
1494 || lseek(f, range_start, SEEK_SET) != range_start
1496 lseek(f, 0, SEEK_SET);
1499 range_len = range_end - range_start + 1;
1500 send_headers(HTTP_PARTIAL_CONTENT);
1507 send_headers(HTTP_OK);
1509 /* If you want to know about EPIPE below
1510 * (happens if you abort downloads from local httpd): */
1511 signal(SIGPIPE, SIG_IGN);
1513 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1514 offset = range_start;
1516 /* sz is rounded down to 64k */
1517 ssize_t sz = MAXINT(ssize_t) - 0xffff;
1518 USE_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1519 count = sendfile(1, f, &offset, sz);
1521 if (offset == range_start)
1525 USE_FEATURE_HTTPD_RANGES(range_len -= sz;)
1526 } while (count > 0 && range_len);
1531 while ((count = safe_read(f, iobuf, IOBUF_SIZE)) > 0) {
1533 USE_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1534 n = full_write(1, iobuf, count);
1537 USE_FEATURE_HTTPD_RANGES(range_len -= count;)
1541 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1544 if (count < 0 && verbose > 1)
1545 bb_perror_msg("error");
1549 static int checkPermIP(void)
1553 /* This could stand some work */
1554 for (cur = ip_a_d; cur; cur = cur->next) {
1557 "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1559 (unsigned char)(cur->ip >> 24),
1560 (unsigned char)(cur->ip >> 16),
1561 (unsigned char)(cur->ip >> 8),
1562 (unsigned char)(cur->ip),
1563 (unsigned char)(cur->mask >> 24),
1564 (unsigned char)(cur->mask >> 16),
1565 (unsigned char)(cur->mask >> 8),
1566 (unsigned char)(cur->mask)
1569 if ((rmt_ip & cur->mask) == cur->ip)
1570 return cur->allow_deny == 'A'; /* Allow/Deny */
1573 /* if unconfigured, return 1 - access from all */
1574 return !flg_deny_all;
1577 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1579 * Check the permission file for access password protected.
1581 * If config file isn't present, everything is allowed.
1582 * Entries are of the form you can see example from header source
1584 * path The file path.
1585 * request User information to validate.
1587 * Returns 1 if request is OK.
1589 static int checkPerm(const char *path, const char *request)
1595 const char *prev = NULL;
1597 /* This could stand some work */
1598 for (cur = g_auth; cur; cur = cur->next) {
1601 p0 = cur->before_colon;
1602 if (prev != NULL && strcmp(prev, p0) != 0)
1603 continue; /* find next identical */
1604 p = cur->after_colon;
1606 fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
1609 if (strncmp(p0, path, l) == 0
1610 && (l == 1 || path[l] == '/' || path[l] == '\0')
1613 /* path match found. Check request */
1614 /* for check next /path:user:password */
1616 u = strchr(request, ':');
1618 /* bad request, ':' required */
1622 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1626 if (strncmp(p, request, u - request) != 0) {
1627 /* user doesn't match */
1630 pp = strchr(p, ':');
1631 if (pp && pp[1] == '$' && pp[2] == '1'
1632 && pp[3] == '$' && pp[4]
1635 cipher = pw_encrypt(u+1, pp);
1636 if (strcmp(cipher, pp) == 0)
1637 goto set_remoteuser_var; /* Ok */
1643 if (strcmp(p, request) == 0) {
1645 remoteuser = strdup(request);
1647 remoteuser[u - request] = '\0';
1654 return prev == NULL;
1656 #endif /* FEATURE_HTTPD_BASIC_AUTH */
1661 static void exit_on_signal(int sig) ATTRIBUTE_NORETURN;
1662 static void exit_on_signal(int sig)
1664 send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1668 * Handle an incoming http request and exit.
1670 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) ATTRIBUTE_NORETURN;
1671 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1673 static const char request_GET[] ALIGN1 = "GET";
1679 int http_major_version;
1681 #if ENABLE_FEATURE_HTTPD_CGI
1682 const char *prequest;
1683 unsigned long length = 0;
1685 char *content_type = 0;
1687 struct sigaction sa;
1688 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1689 int credentials = -1; /* if not required this is Ok */
1692 /* Allocation of iobuf is postponed until now
1693 * (IOW, server process doesn't need to waste 8k) */
1694 iobuf = xmalloc(IOBUF_SIZE);
1697 if (fromAddr->sa.sa_family == AF_INET) {
1698 rmt_ip = ntohl(fromAddr->sin.sin_addr.s_addr);
1700 #if ENABLE_FEATURE_IPV6
1701 if (fromAddr->sa.sa_family == AF_INET6
1702 && fromAddr->sin6.sin6_addr.s6_addr32[0] == 0
1703 && fromAddr->sin6.sin6_addr.s6_addr32[1] == 0
1704 && ntohl(fromAddr->sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1705 rmt_ip = ntohl(fromAddr->sin6.sin6_addr.s6_addr32[3]);
1707 if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1708 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->sa);
1711 /* this trick makes -v logging much simpler */
1712 applet_name = rmt_ip_str;
1714 bb_error_msg("connected");
1717 /* Install timeout handler */
1718 memset(&sa, 0, sizeof(sa));
1719 sa.sa_handler = exit_on_signal;
1720 /* sigemptyset(&sa.sa_mask); - memset should be enough */
1721 /*sa.sa_flags = 0; - no SA_RESTART */
1722 sigaction(SIGALRM, &sa, NULL);
1723 alarm(HEADER_READ_TIMEOUT);
1725 if (!get_line()) /* EOF or error or empty line */
1726 send_headers_and_exit(HTTP_BAD_REQUEST);
1728 /* Determine type of request (GET/POST) */
1729 urlp = strpbrk(iobuf, " \t");
1731 send_headers_and_exit(HTTP_BAD_REQUEST);
1733 #if ENABLE_FEATURE_HTTPD_CGI
1734 prequest = request_GET;
1735 if (strcasecmp(iobuf, prequest) != 0) {
1737 if (strcasecmp(iobuf, prequest) != 0)
1738 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1741 if (strcasecmp(iobuf, request_GET) != 0)
1742 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1744 urlp = skip_whitespace(urlp);
1746 send_headers_and_exit(HTTP_BAD_REQUEST);
1748 /* Find end of URL and parse HTTP version, if any */
1749 http_major_version = -1;
1750 tptr = strchrnul(urlp, ' ');
1751 /* Is it " HTTP/"? */
1752 if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0)
1753 http_major_version = (tptr[6] - '0');
1756 /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
1757 urlcopy = alloca((tptr - urlp) + sizeof("/index.html"));
1758 /*if (urlcopy == NULL)
1759 * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
1760 strcpy(urlcopy, urlp);
1761 /* NB: urlcopy ptr is never changed after this */
1763 /* Extract url args if present */
1764 tptr = strchr(urlcopy, '?');
1771 /* Decode URL escape sequences */
1772 tptr = decodeString(urlcopy, 0);
1774 send_headers_and_exit(HTTP_BAD_REQUEST);
1775 if (tptr == urlcopy + 1) {
1776 /* '/' or NUL is encoded */
1777 send_headers_and_exit(HTTP_NOT_FOUND);
1780 /* Canonicalize path */
1781 /* Algorithm stolen from libbb bb_simplify_path(),
1782 * but don't strdup and reducing trailing slash and protect out root */
1783 urlp = tptr = urlcopy;
1786 /* skip duplicate (or initial) slash */
1791 /* skip extra '.' */
1792 if (tptr[1] == '/' || !tptr[1]) {
1795 /* '..': be careful */
1796 if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
1798 if (urlp == urlcopy) /* protect root */
1799 send_headers_and_exit(HTTP_BAD_REQUEST);
1800 while (*--urlp != '/') /* omit previous dir */;
1807 *++urlp = '\0'; /* so keep last character */
1808 tptr = urlp; /* end ptr */
1810 /* If URL is a directory, add '/' */
1811 if (tptr[-1] != '/') {
1812 if (is_directory(urlcopy + 1, 1, &sb)) {
1813 found_moved_temporarily = urlcopy;
1819 bb_error_msg("url:%s", urlcopy);
1822 ip_allowed = checkPermIP();
1823 while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
1824 /* have path1/path2 */
1826 if (is_directory(urlcopy + 1, 1, &sb)) {
1827 /* may be having subdir config */
1828 parse_conf(urlcopy + 1, SUBDIR_PARSE);
1829 ip_allowed = checkPermIP();
1833 if (http_major_version >= 0) {
1834 /* Request was with "... HTTP/nXXX", and n >= 0 */
1836 /* Read until blank line for HTTP version specified, else parse immediate */
1838 alarm(HEADER_READ_TIMEOUT);
1840 break; /* EOF or error or empty line */
1842 bb_error_msg("header: '%s'", iobuf);
1844 #if ENABLE_FEATURE_HTTPD_CGI
1845 /* try and do our best to parse more lines */
1846 if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
1847 /* extra read only for POST */
1848 if (prequest != request_GET) {
1849 tptr = iobuf + sizeof("Content-length:") - 1;
1851 send_headers_and_exit(HTTP_BAD_REQUEST);
1853 /* not using strtoul: it ignores leading minus! */
1854 length = strtol(tptr, &tptr, 10);
1855 /* length is "ulong", but we need to pass it to int later */
1856 /* so we check for negative or too large values in one go: */
1857 /* (long -> ulong conv caused negatives to be seen as > INT_MAX) */
1858 if (tptr[0] || errno || length > INT_MAX)
1859 send_headers_and_exit(HTTP_BAD_REQUEST);
1861 } else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
1862 cookie = strdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
1863 } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
1864 content_type = strdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
1865 } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
1866 referer = strdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
1867 } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
1868 user_agent = strdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
1871 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1872 if (STRNCASECMP(iobuf, "Authorization:") == 0) {
1873 /* We only allow Basic credentials.
1874 * It shows up as "Authorization: Basic <userid:password>" where
1875 * the userid:password is base64 encoded.
1877 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
1878 if (STRNCASECMP(tptr, "Basic") != 0)
1880 tptr += sizeof("Basic")-1;
1881 /* decodeBase64() skips whitespace itself */
1883 credentials = checkPerm(urlcopy, tptr);
1885 #endif /* FEATURE_HTTPD_BASIC_AUTH */
1886 #if ENABLE_FEATURE_HTTPD_RANGES
1887 if (STRNCASECMP(iobuf, "Range:") == 0) {
1888 // We know only bytes=NNN-[MMM]
1889 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
1890 if (strncmp(s, "bytes=", 6) == 0) {
1891 s += sizeof("bytes=")-1;
1892 range_start = BB_STRTOOFF(s, &s, 10);
1893 if (s[0] != '-' || range_start < 0) {
1896 range_end = BB_STRTOOFF(s+1, NULL, 10);
1897 if (errno || range_end < range_start)
1903 } /* while extra header reading */
1906 /* We read headers, disable peer timeout */
1909 if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || ip_allowed == 0) {
1910 /* protect listing [/path]/httpd_conf or IP deny */
1911 send_headers_and_exit(HTTP_FORBIDDEN);
1914 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1915 if (credentials <= 0 && checkPerm(urlcopy, ":") == 0) {
1916 send_headers_and_exit(HTTP_UNAUTHORIZED);
1920 if (found_moved_temporarily) {
1921 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
1924 tptr = urlcopy + 1; /* skip first '/' */
1926 #if ENABLE_FEATURE_HTTPD_CGI
1927 if (strncmp(tptr, "cgi-bin/", 8) == 0) {
1928 if (tptr[8] == '\0') {
1929 /* protect listing "cgi-bin/" */
1930 send_headers_and_exit(HTTP_FORBIDDEN);
1932 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
1934 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1936 char *suffix = strrchr(tptr, '.');
1939 for (cur = script_i; cur; cur = cur->next) {
1940 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1941 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
1947 if (prequest != request_GET) {
1948 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1950 #endif /* FEATURE_HTTPD_CGI */
1952 if (urlp[-1] == '/')
1953 strcpy(urlp, "index.html");
1954 if (stat(tptr, &sb) == 0) {
1955 file_size = sb.st_size;
1956 last_mod = sb.st_mtime;
1958 #if ENABLE_FEATURE_HTTPD_CGI
1959 else if (urlp[-1] == '/') {
1960 /* It's a dir URL and there is no index.html
1961 * Try cgi-bin/index.cgi */
1962 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
1965 send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
1970 * fall through to send_file, it errors out if open fails
1974 send_file_and_exit(tptr, TRUE);
1978 * The main http server function.
1979 * Given a socket, listen for new connections and farm out
1980 * the processing as a [v]forked process.
1984 static void mini_httpd(int server_socket) ATTRIBUTE_NORETURN;
1985 static void mini_httpd(int server_socket)
1987 /* NB: it's best to not use xfuncs in this loop before fork().
1988 * Otherwise server may die on transient errors (temporary
1989 * out-of-memory condition, etc), which is Bad(tm).
1990 * Try to do any dangerous calls after fork.
1994 len_and_sockaddr fromAddr;
1996 /* Wait for connections... */
1997 fromAddr.len = LSA_SIZEOF_SA;
1998 n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
2002 /* set the KEEPALIVE option to cull dead connections */
2003 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2007 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2008 /* Do not reload config on HUP */
2009 signal(SIGHUP, SIG_IGN);
2011 close(server_socket);
2015 handle_incoming_and_exit(&fromAddr);
2017 /* parent, or fork failed */
2023 static void mini_httpd_nommu(int server_socket, int argc, char **argv) ATTRIBUTE_NORETURN;
2024 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2026 char *argv_copy[argc + 2];
2028 argv_copy[0] = argv[0];
2029 argv_copy[1] = (char*)"-i";
2030 memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2032 /* NB: it's best to not use xfuncs in this loop before vfork().
2033 * Otherwise server may die on transient errors (temporary
2034 * out-of-memory condition, etc), which is Bad(tm).
2035 * Try to do any dangerous calls after fork.
2039 len_and_sockaddr fromAddr;
2041 /* Wait for connections... */
2042 fromAddr.len = LSA_SIZEOF_SA;
2043 n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
2047 /* set the KEEPALIVE option to cull dead connections */
2048 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2052 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2053 /* Do not reload config on HUP */
2054 signal(SIGHUP, SIG_IGN);
2056 close(server_socket);
2060 /* Run a copy of ourself in inetd mode */
2063 /* parent, or vfork failed */
2071 * Process a HTTP connection on stdin/out.
2074 static void mini_httpd_inetd(void) ATTRIBUTE_NORETURN;
2075 static void mini_httpd_inetd(void)
2077 len_and_sockaddr fromAddr;
2079 fromAddr.len = LSA_SIZEOF_SA;
2080 getpeername(0, &fromAddr.sa, &fromAddr.len);
2081 handle_incoming_and_exit(&fromAddr);
2084 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2085 static void sighup_handler(int sig)
2087 struct sigaction sa;
2089 parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
2091 memset(&sa, 0, sizeof(sa));
2092 sa.sa_handler = sighup_handler;
2093 /*sigemptyset(&sa.sa_mask); - memset should be enough */
2094 sa.sa_flags = SA_RESTART;
2095 sigaction(SIGHUP, &sa, NULL);
2100 c_opt_config_file = 0,
2103 USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2104 USE_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,)
2105 USE_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,)
2106 USE_FEATURE_HTTPD_SETUID( u_opt_setuid ,)
2111 OPT_CONFIG_FILE = 1 << c_opt_config_file,
2112 OPT_DECODE_URL = 1 << d_opt_decode_url,
2113 OPT_HOME_HTTPD = 1 << h_opt_home_httpd,
2114 OPT_ENCODE_URL = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2115 OPT_REALM = USE_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0,
2116 OPT_MD5 = USE_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0,
2117 OPT_SETUID = USE_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0,
2118 OPT_PORT = 1 << p_opt_port,
2119 OPT_INETD = 1 << p_opt_inetd,
2120 OPT_FOREGROUND = 1 << p_opt_foreground,
2121 OPT_VERBOSE = 1 << p_opt_verbose,
2125 int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2126 int httpd_main(int argc, char **argv)
2128 int server_socket = server_socket; /* for gcc */
2130 char *url_for_decode;
2131 USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2132 USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2133 USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2134 USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2138 #if ENABLE_LOCALE_SUPPORT
2139 /* Undo busybox.c: we want to speak English in http (dates etc) */
2140 setlocale(LC_TIME, "C");
2143 home_httpd = xrealloc_getcwd_or_warn(NULL);
2144 /* -v counts, -i implies -f */
2145 opt_complementary = "vv:if";
2146 /* We do not "absolutize" path given by -h (home) opt.
2147 * If user gives relative path in -h, $SCRIPT_FILENAME can end up
2149 opt = getopt32(argv, "c:d:h:"
2150 USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2151 USE_FEATURE_HTTPD_BASIC_AUTH("r:")
2152 USE_FEATURE_HTTPD_AUTH_MD5("m:")
2153 USE_FEATURE_HTTPD_SETUID("u:")
2155 &configFile, &url_for_decode, &home_httpd
2156 USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2157 USE_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2158 USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
2159 USE_FEATURE_HTTPD_SETUID(, &s_ugid)
2160 , &bind_addr_or_port
2163 if (opt & OPT_DECODE_URL) {
2164 fputs(decodeString(url_for_decode, 1), stdout);
2167 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2168 if (opt & OPT_ENCODE_URL) {
2169 fputs(encodeString(url_for_encode), stdout);
2173 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2174 if (opt & OPT_MD5) {
2175 puts(pw_encrypt(pass, "$1$"));
2179 #if ENABLE_FEATURE_HTTPD_SETUID
2180 if (opt & OPT_SETUID) {
2181 if (!get_uidgid(&ugid, s_ugid, 1))
2182 bb_error_msg_and_die("unrecognized user[:group] "
2183 "name '%s'", s_ugid);
2188 if (!(opt & OPT_FOREGROUND)) {
2189 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2194 if (!(opt & OPT_INETD)) {
2195 signal(SIGCHLD, SIG_IGN);
2196 server_socket = openServer();
2197 #if ENABLE_FEATURE_HTTPD_SETUID
2198 /* drop privileges */
2199 if (opt & OPT_SETUID) {
2200 if (ugid.gid != (gid_t)-1) {
2201 if (setgroups(1, &ugid.gid) == -1)
2202 bb_perror_msg_and_die("setgroups");
2210 #if 0 /*was #if ENABLE_FEATURE_HTTPD_CGI*/
2211 /* User can do it himself: 'env - PATH="$PATH" httpd'
2212 * We don't do it because we don't want to screw users
2214 * 'env - VAR1=val1 VAR2=val2 https'
2215 * and have VAR1 and VAR2 values visible in their CGIs.
2216 * Besides, it is also smaller. */
2218 char *p = getenv("PATH");
2219 /* env strings themself are not freed, no need to strdup(p): */
2223 // if (!(opt & OPT_INETD))
2224 // setenv_long("SERVER_PORT", ???);
2228 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2229 if (!(opt & OPT_INETD))
2231 else /* do not install HUP handler in inetd mode */
2233 parse_conf(default_path_httpd_conf, FIRST_PARSE);
2235 xfunc_error_retval = 0;
2236 if (opt & OPT_INETD)
2239 if (!(opt & OPT_FOREGROUND))
2240 bb_daemonize(0); /* don't change current directory */
2241 mini_httpd(server_socket); /* never returns */
2243 mini_httpd_nommu(server_socket, argc, argv); /* never returns */