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_perror_msg_and_die("%s", 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 */
612 } else if (*cf == '.') {
613 if (cf[1] == '/' || cf[1] == '\0') { /* remove extra '.' */
615 } else if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == '\0')) {
618 while (*--p != '/') /* omit previous dir */;
627 if ((p == p0) || (*p != '/')) { /* not a trailing slash */
628 ++p; /* so keep last character */
631 sprintf(p0 + strlen(p0), ":%s", c);
635 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
636 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
637 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
638 /* storing current config line */
639 cur = xzalloc(sizeof(Htaccess) + strlen(p0));
641 cf = strcpy(cur->before_colon, p0);
644 cur->after_colon = c;
645 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
647 /* config .mime line move top for overwrite previous */
653 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
654 if (*cf == '*' && cf[1] == '.') {
655 /* config script interpreter line move top for overwrite previous */
656 cur->next = script_i;
661 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
667 /* sort path, if current lenght eq or bigger then move up */
668 Htaccess *prev_hti = g_auth;
669 size_t l = strlen(cf);
672 for (hti = prev_hti; hti; hti = hti->next) {
673 if (l >= strlen(hti->before_colon)) {
674 /* insert before hti */
676 if (prev_hti != hti) {
677 prev_hti->next = cur;
685 prev_hti = prev_hti->next;
687 if (!hti) { /* not inserted, add to bottom */
699 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
701 * Given a string, html-encode special characters.
702 * This is used for the -e command line option to provide an easy way
703 * for scripts to encode result data without confusing browsers. The
704 * returned string pointer is memory allocated by malloc().
706 * Returns a pointer to the encoded string (malloced).
708 static char *encodeString(const char *string)
710 /* take the simple route and encode everything */
711 /* could possibly scan once to get length. */
712 int len = strlen(string);
713 char *out = xmalloc(len * 6 + 1);
717 while ((ch = *string++)) {
718 /* very simple check for what to encode */
722 p += sprintf(p, "&#%d;", (unsigned char) ch);
727 #endif /* FEATURE_HTTPD_ENCODE_URL_STR */
730 * Given a URL encoded string, convert it to plain ascii.
731 * Since decoding always makes strings smaller, the decode is done in-place.
732 * Thus, callers should strdup() the argument if they do not want the
733 * argument modified. The return is the original pointer, allowing this
734 * function to be easily used as arguments to other functions.
736 * string The first string to decode.
737 * option_d 1 if called for httpd -d
739 * Returns a pointer to the decoded string (same as input).
741 static unsigned hex_to_bin(unsigned char c)
748 /* c | 0x20: letters to lower case, non-letters
749 * to (potentially different) non-letters */
750 v = (unsigned)(c | 0x20) - 'a';
756 void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
757 int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
758 t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
760 static char *decodeString(char *orig, int option_d)
762 /* note that decoded string is always shorter than original */
767 while ((c = *ptr++) != '\0') {
770 if (option_d && c == '+') {
778 v = hex_to_bin(ptr[0]);
786 v = (v * 16) | hex_to_bin(ptr[1]);
789 if (!option_d && (v == '/' || v == '\0')) {
790 /* caller takes it as indication of invalid
791 * (dangerous wrt exploits) chars */
801 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
803 * Decode a base64 data stream as per rfc1521.
804 * Note that the rfc states that non base64 chars are to be ignored.
805 * Since the decode always results in a shorter size than the input,
806 * it is OK to pass the input arg as an output arg.
807 * Parameter: a pointer to a base64 encoded string.
808 * Decoded data is stored in-place.
810 static void decodeBase64(char *Data)
812 const unsigned char *in = (const unsigned char *)Data;
813 /* The decoded size will be at most 3/4 the size of the encoded */
820 if (t >= '0' && t <= '9')
822 else if (t >= 'A' && t <= 'Z')
824 else if (t >= 'a' && t <= 'z')
838 *Data++ = (char) (ch >> 16);
839 *Data++ = (char) (ch >> 8);
849 * Create a listen server socket on the designated port.
851 static int openServer(void)
853 int n = bb_strtou(bind_addr_or_port, NULL, 10);
854 if (!errno && n && n <= 0xffff)
855 n = create_and_bind_stream_or_die(NULL, n);
857 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
863 * Log the connection closure and exit.
865 static void log_and_exit(void) ATTRIBUTE_NORETURN;
866 static void log_and_exit(void)
868 /* Paranoia. IE said to be buggy. It may send some extra data
869 * or be confused by us just exiting without SHUT_WR. Oh well. */
870 shutdown(1, SHUT_WR);
872 while (read(0, iobuf, IOBUF_SIZE) > 0)
876 bb_error_msg("closed");
877 _exit(xfunc_error_retval);
881 * Create and send HTTP response headers.
882 * The arguments are combined and sent as one write operation. Note that
883 * IE will puke big-time if the headers are not sent in one packet and the
884 * second packet is delayed for any reason.
885 * responseNum - the result code to send.
887 static void send_headers(int responseNum)
889 static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
891 const char *responseString = "";
892 const char *infoString = NULL;
893 const char *mime_type;
894 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
895 const char *error_page = 0;
898 time_t timer = time(0);
902 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
903 if (http_response_type[i] == responseNum) {
904 responseString = http_response[i].name;
905 infoString = http_response[i].info;
906 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
907 error_page = http_error_page[i];
912 /* error message is HTML */
913 mime_type = responseNum == HTTP_OK ?
914 found_mime_type : "text/html";
917 bb_error_msg("response:%u", responseNum);
919 /* emit the current date */
920 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
922 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
923 "Date: %s\r\nConnection: close\r\n",
924 responseNum, responseString, mime_type, tmp_str);
926 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
927 if (responseNum == HTTP_UNAUTHORIZED) {
928 len += sprintf(iobuf + len,
929 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
933 if (responseNum == HTTP_MOVED_TEMPORARILY) {
934 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
935 found_moved_temporarily,
936 (g_query ? "?" : ""),
937 (g_query ? g_query : ""));
940 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
941 if (error_page && !access(error_page, R_OK)) {
942 strcat(iobuf, "\r\n");
946 fprintf(stderr, "headers: '%s'\n", iobuf);
947 full_write(1, iobuf, len);
949 fprintf(stderr, "writing error page: '%s'\n", error_page);
950 return send_file_and_exit(error_page, FALSE);
954 if (file_size != -1) { /* file */
955 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
956 #if ENABLE_FEATURE_HTTPD_RANGES
957 if (responseNum == HTTP_PARTIAL_CONTENT) {
958 len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n",
962 file_size = range_end - range_start + 1;
965 len += sprintf(iobuf + len,
966 #if ENABLE_FEATURE_HTTPD_RANGES
967 "Accept-Ranges: bytes\r\n"
969 "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
978 len += sprintf(iobuf + len,
979 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
980 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
981 responseNum, responseString,
982 responseNum, responseString, infoString);
985 fprintf(stderr, "headers: '%s'\n", iobuf);
986 if (full_write(1, iobuf, len) != len) {
988 bb_perror_msg("error");
993 static void send_headers_and_exit(int responseNum) ATTRIBUTE_NORETURN;
994 static void send_headers_and_exit(int responseNum)
996 send_headers(responseNum);
1001 * Read from the socket until '\n' or EOF. '\r' chars are removed.
1002 * '\n' is replaced with NUL.
1003 * Return number of characters read or 0 if nothing is read
1004 * ('\r' and '\n' are not counted).
1005 * Data is returned in iobuf.
1007 static int get_line(void)
1014 hdr_cnt = safe_read(0, hdr_buf, sizeof(hdr_buf));
1019 iobuf[count] = c = *hdr_ptr++;
1025 iobuf[count] = '\0';
1028 if (count < (IOBUF_SIZE - 1)) /* check overflow */
1034 #if ENABLE_FEATURE_HTTPD_CGI
1036 /* gcc 4.2.1 fares better with NOINLINE */
1037 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) ATTRIBUTE_NORETURN;
1038 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1040 enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1041 struct pollfd pfd[3];
1042 int out_cnt; /* we buffer a bit of initial CGI output */
1045 /* iobuf is used for CGI -> network data,
1046 * hdr_buf is for network -> CGI data (POSTDATA) */
1048 /* If CGI dies, we still want to correctly finish reading its output
1049 * and send it to the peer. So please no SIGPIPEs! */
1050 signal(SIGPIPE, SIG_IGN);
1052 /* NB: breaking out of this loop jumps to log_and_exit() */
1055 memset(pfd, 0, sizeof(pfd));
1057 pfd[FROM_CGI].fd = fromCgi_rd;
1058 pfd[FROM_CGI].events = POLLIN;
1061 pfd[TO_CGI].fd = toCgi_wr;
1063 pfd[TO_CGI].events = POLLOUT;
1064 } else if (post_len > 0) {
1065 pfd[0].events = POLLIN;
1067 /* post_len <= 0 && hdr_cnt <= 0:
1068 * no more POST data to CGI,
1069 * let CGI see EOF on CGI's stdin */
1075 /* Now wait on the set of sockets */
1076 count = poll(pfd, 3, -1);
1083 if (waitpid(pid, &status, WNOHANG) <= 0) {
1084 /* Weird. CGI didn't exit and no fd's
1085 * are ready, yet poll returned?! */
1088 if (DEBUG && WIFEXITED(status))
1089 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1090 if (DEBUG && WIFSIGNALED(status))
1091 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1096 if (pfd[TO_CGI].revents) {
1097 /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */
1098 /* Have data from peer and can write to CGI */
1099 count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1100 /* Doesn't happen, we dont use nonblocking IO here
1101 *if (count < 0 && errno == EAGAIN) {
1108 /* EOF/broken pipe to CGI, stop piping POST data */
1109 hdr_cnt = post_len = 0;
1113 if (pfd[0].revents) {
1114 /* post_len > 0 && hdr_cnt == 0 here */
1115 /* We expect data, prev data portion is eaten by CGI
1116 * and there *is* data to read from the peer
1118 //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
1119 //count = safe_read(0, hdr_buf, count);
1120 count = safe_read(0, hdr_buf, sizeof(hdr_buf));
1126 /* no more POST data can be read */
1131 if (pfd[FROM_CGI].revents) {
1132 /* There is something to read from CGI */
1135 /* Are we still buffering CGI output? */
1137 /* HTTP_200[] has single "\r\n" at the end.
1138 * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1139 * CGI scripts MUST send their own header terminated by
1140 * empty line, then data. That's why we have only one
1141 * <cr><lf> pair here. We will output "200 OK" line
1142 * if needed, but CGI still has to provide blank line
1143 * between header and body */
1145 /* Must use safe_read, not full_read, because
1146 * CGI may output a few first bytes and then wait
1147 * for POSTDATA without closing stdout.
1148 * With full_read we may wait here forever. */
1149 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1151 /* eof (or error) and there was no "HTTP",
1152 * so write it, then write received data */
1154 full_write(1, HTTP_200, sizeof(HTTP_200)-1);
1155 full_write(1, rbuf, out_cnt);
1157 break; /* CGI stdout is closed, exiting */
1161 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1162 if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1163 /* send "HTTP/1.0 " */
1164 if (full_write(1, HTTP_200, 9) != 9)
1166 rbuf += 8; /* skip "Status: " */
1167 count = out_cnt - 8;
1168 out_cnt = -1; /* buffering off */
1169 } else if (out_cnt >= 4) {
1170 /* Did CGI add "HTTP"? */
1171 if (memcmp(rbuf, HTTP_200, 4) != 0) {
1172 /* there is no "HTTP", do it ourself */
1173 if (full_write(1, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1177 if (!strstr(rbuf, "ontent-")) {
1178 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1180 * Counter-example of valid CGI without Content-type:
1181 * echo -en "HTTP/1.0 302 Found\r\n"
1182 * echo -en "Location: http://www.busybox.net\r\n"
1186 out_cnt = -1; /* buffering off */
1189 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1191 break; /* eof (or error) */
1193 if (full_write(1, rbuf, count) != count)
1196 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1197 } /* if (pfd[FROM_CGI].revents) */
1202 static void setenv1(const char *name, const char *value)
1204 setenv(name, value ? value : "", 1);
1208 * Spawn CGI script, forward CGI's stdin/out <=> network
1210 * Environment variables are set up and the script is invoked with pipes
1211 * for stdin/stdout. If a POST is being done the script is fed the POST
1212 * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1215 * const char *url The requested URL (with leading /).
1216 * int post_len Length of the POST body.
1217 * const char *cookie For set HTTP_COOKIE.
1218 * const char *content_type For set CONTENT_TYPE.
1220 static void send_cgi_and_exit(
1222 const char *request,
1225 const char *content_type) ATTRIBUTE_NORETURN;
1226 static void send_cgi_and_exit(
1228 const char *request,
1231 const char *content_type)
1233 struct { int rd; int wr; } fromCgi; /* CGI -> httpd pipe */
1234 struct { int rd; int wr; } toCgi; /* httpd -> CGI pipe */
1241 * We are mucking with environment _first_ and then vfork/exec,
1242 * this allows us to use vfork safely. Parent don't care about
1243 * these environment changes anyway.
1249 purl = xstrdup(url);
1251 while ((script = strchr(script + 1, '/')) != NULL) {
1252 /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
1256 if (!is_directory(purl + 1, 1, &sb)) {
1257 /* not directory, found script.cgi/PATH_INFO */
1261 *script = '/'; /* is directory, find next '/' */
1263 setenv1("PATH_INFO", script); /* set /PATH_INFO or "" */
1264 setenv1("REQUEST_METHOD", request);
1266 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", purl, g_query));
1268 setenv1("REQUEST_URI", purl);
1271 *script = '\0'; /* cut off /PATH_INFO */
1273 /* SCRIPT_FILENAME required by PHP in CGI mode */
1274 fullpath = concat_path_file(home_httpd, purl);
1275 setenv1("SCRIPT_FILENAME", fullpath);
1276 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1277 setenv1("SCRIPT_NAME", purl);
1278 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1279 * QUERY_STRING: The information which follows the ? in the URL
1280 * which referenced this script. This is the query information.
1281 * It should not be decoded in any fashion. This variable
1282 * should always be set when there is query information,
1283 * regardless of command line decoding. */
1284 /* (Older versions of bbox seem to do some decoding) */
1285 setenv1("QUERY_STRING", g_query);
1286 putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1287 putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1288 putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1289 /* Having _separate_ variables for IP and port defeats
1290 * the purpose of having socket abstraction. Which "port"
1291 * are you using on Unix domain socket?
1292 * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1295 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1296 char *cp = strrchr(p, ':');
1297 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1299 if (cp) *cp = '\0'; /* delete :PORT */
1300 setenv1("REMOTE_ADDR", p);
1303 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1304 setenv1("REMOTE_PORT", cp + 1);
1308 setenv1("HTTP_USER_AGENT", user_agent);
1310 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1312 setenv1("HTTP_COOKIE", cookie);
1314 setenv1("CONTENT_TYPE", content_type);
1315 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1317 setenv1("REMOTE_USER", remoteuser);
1318 putenv((char*)"AUTH_TYPE=Basic");
1322 setenv1("HTTP_REFERER", referer);
1329 /* TODO: log perror? */
1335 xfunc_error_retval = 242;
1337 xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */
1338 xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */
1341 /* User seeing stderr output can be a security problem.
1342 * If CGI really wants that, it can always do dup itself. */
1345 /* script must have absolute path */
1346 script = strrchr(fullpath, '/');
1348 goto error_execing_cgi;
1350 /* chdiring to script's dir */
1351 if (chdir(fullpath) == 0) {
1353 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1354 char *interpr = NULL;
1355 char *suffix = strrchr(purl, '.');
1359 for (cur = script_i; cur; cur = cur->next) {
1360 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1361 interpr = cur->after_colon;
1368 /* set argv[0] to name without path */
1369 argv[0] = (char*)bb_basename(purl);
1371 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1373 execv(interpr, argv);
1376 execv(fullpath, argv);
1380 * (we are CGI here, our stdout is pumped to the net) */
1381 send_headers_and_exit(HTTP_NOT_FOUND);
1384 /* Parent process */
1386 /* Restore variables possibly changed by child */
1387 xfunc_error_retval = 0;
1392 cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1395 #endif /* FEATURE_HTTPD_CGI */
1398 * Send a file response to a HTTP request, and exit
1401 * const char *url The requested URL (with leading /).
1402 * headers Don't send headers before if FALSE.
1404 static void send_file_and_exit(const char *url, int headers)
1406 static const char *const suffixTable[] = {
1407 /* Warning: shorter equivalent suffix in one line must be first */
1408 ".htm.html", "text/html",
1409 ".jpg.jpeg", "image/jpeg",
1410 ".gif", "image/gif",
1411 ".png", "image/png",
1412 ".txt.h.c.cc.cpp", "text/plain",
1414 ".wav", "audio/wav",
1415 ".avi", "video/x-msvideo",
1416 ".qt.mov", "video/quicktime",
1417 ".mpe.mpeg", "video/mpeg",
1418 ".mid.midi", "audio/midi",
1419 ".mp3", "audio/mpeg",
1420 #if 0 /* unpopular */
1421 ".au", "audio/basic",
1422 ".pac", "application/x-ns-proxy-autoconfig",
1423 ".vrml.wrl", "model/vrml",
1430 const char *const *table;
1431 const char *try_suffix;
1433 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1437 suffix = strrchr(url, '.');
1439 /* If not found, set default as "application/octet-stream"; */
1440 found_mime_type = "application/octet-stream";
1442 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1445 for (table = suffixTable; *table; table += 2) {
1446 try_suffix = strstr(table[0], suffix);
1448 try_suffix += strlen(suffix);
1449 if (*try_suffix == '\0' || *try_suffix == '.') {
1450 found_mime_type = table[1];
1455 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1456 for (cur = mime_a; cur; cur = cur->next) {
1457 if (strcmp(cur->before_colon, suffix) == 0) {
1458 found_mime_type = cur->after_colon;
1466 bb_error_msg("sending file '%s' content-type: %s",
1467 url, found_mime_type);
1469 f = open(url, O_RDONLY);
1472 bb_perror_msg("cannot open '%s'", url);
1474 send_headers_and_exit(HTTP_NOT_FOUND);
1476 #if ENABLE_FEATURE_HTTPD_RANGES
1478 range_start = 0; /* err pages and ranges don't mix */
1479 range_len = MAXINT(off_t);
1482 range_end = file_size - 1;
1484 if (range_end < range_start
1485 || lseek(f, range_start, SEEK_SET) != range_start
1487 lseek(f, 0, SEEK_SET);
1490 range_len = range_end - range_start + 1;
1491 send_headers(HTTP_PARTIAL_CONTENT);
1498 send_headers(HTTP_OK);
1500 /* If you want to know about EPIPE below
1501 * (happens if you abort downloads from local httpd): */
1502 signal(SIGPIPE, SIG_IGN);
1504 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1505 offset = range_start;
1507 /* sz is rounded down to 64k */
1508 ssize_t sz = MAXINT(ssize_t) - 0xffff;
1509 USE_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1510 count = sendfile(1, f, &offset, sz);
1512 if (offset == range_start)
1516 USE_FEATURE_HTTPD_RANGES(range_len -= sz;)
1517 } while (count > 0 && range_len);
1522 while ((count = safe_read(f, iobuf, IOBUF_SIZE)) > 0) {
1524 USE_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1525 n = full_write(1, iobuf, count);
1528 USE_FEATURE_HTTPD_RANGES(range_len -= count;)
1532 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1535 if (count < 0 && verbose > 1)
1536 bb_perror_msg("error");
1540 static int checkPermIP(void)
1544 /* This could stand some work */
1545 for (cur = ip_a_d; cur; cur = cur->next) {
1548 "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1550 (unsigned char)(cur->ip >> 24),
1551 (unsigned char)(cur->ip >> 16),
1552 (unsigned char)(cur->ip >> 8),
1553 (unsigned char)(cur->ip),
1554 (unsigned char)(cur->mask >> 24),
1555 (unsigned char)(cur->mask >> 16),
1556 (unsigned char)(cur->mask >> 8),
1557 (unsigned char)(cur->mask)
1560 if ((rmt_ip & cur->mask) == cur->ip)
1561 return cur->allow_deny == 'A'; /* Allow/Deny */
1564 /* if unconfigured, return 1 - access from all */
1565 return !flg_deny_all;
1568 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1570 * Check the permission file for access password protected.
1572 * If config file isn't present, everything is allowed.
1573 * Entries are of the form you can see example from header source
1575 * path The file path.
1576 * request User information to validate.
1578 * Returns 1 if request is OK.
1580 static int checkPerm(const char *path, const char *request)
1586 const char *prev = NULL;
1588 /* This could stand some work */
1589 for (cur = g_auth; cur; cur = cur->next) {
1592 p0 = cur->before_colon;
1593 if (prev != NULL && strcmp(prev, p0) != 0)
1594 continue; /* find next identical */
1595 p = cur->after_colon;
1597 fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
1600 if (strncmp(p0, path, l) == 0
1601 && (l == 1 || path[l] == '/' || path[l] == '\0')
1604 /* path match found. Check request */
1605 /* for check next /path:user:password */
1607 u = strchr(request, ':');
1609 /* bad request, ':' required */
1613 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1617 if (strncmp(p, request, u - request) != 0) {
1618 /* user doesn't match */
1621 pp = strchr(p, ':');
1622 if (pp && pp[1] == '$' && pp[2] == '1'
1623 && pp[3] == '$' && pp[4]
1626 cipher = pw_encrypt(u+1, pp);
1627 if (strcmp(cipher, pp) == 0)
1628 goto set_remoteuser_var; /* Ok */
1634 if (strcmp(p, request) == 0) {
1636 remoteuser = strdup(request);
1638 remoteuser[u - request] = '\0';
1645 return prev == NULL;
1647 #endif /* FEATURE_HTTPD_BASIC_AUTH */
1652 static void exit_on_signal(int sig) ATTRIBUTE_NORETURN;
1653 static void exit_on_signal(int sig)
1655 send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1659 * Handle an incoming http request and exit.
1661 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) ATTRIBUTE_NORETURN;
1662 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1664 static const char request_GET[] ALIGN1 = "GET";
1670 int http_major_version;
1672 #if ENABLE_FEATURE_HTTPD_CGI
1673 const char *prequest;
1674 unsigned long length = 0;
1676 char *content_type = 0;
1678 struct sigaction sa;
1679 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1680 int credentials = -1; /* if not required this is Ok */
1683 /* Allocation of iobuf is postponed until now
1684 * (IOW, server process doesn't need to waste 8k) */
1685 iobuf = xmalloc(IOBUF_SIZE);
1688 if (fromAddr->sa.sa_family == AF_INET) {
1689 rmt_ip = ntohl(fromAddr->sin.sin_addr.s_addr);
1691 #if ENABLE_FEATURE_IPV6
1692 if (fromAddr->sa.sa_family == AF_INET6
1693 && fromAddr->sin6.sin6_addr.s6_addr32[0] == 0
1694 && fromAddr->sin6.sin6_addr.s6_addr32[1] == 0
1695 && ntohl(fromAddr->sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1696 rmt_ip = ntohl(fromAddr->sin6.sin6_addr.s6_addr32[3]);
1698 if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1699 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->sa);
1702 /* this trick makes -v logging much simpler */
1703 applet_name = rmt_ip_str;
1705 bb_error_msg("connected");
1708 /* Install timeout handler */
1709 memset(&sa, 0, sizeof(sa));
1710 sa.sa_handler = exit_on_signal;
1711 /* sigemptyset(&sa.sa_mask); - memset should be enough */
1712 /*sa.sa_flags = 0; - no SA_RESTART */
1713 sigaction(SIGALRM, &sa, NULL);
1714 alarm(HEADER_READ_TIMEOUT);
1716 if (!get_line()) /* EOF or error or empty line */
1717 send_headers_and_exit(HTTP_BAD_REQUEST);
1719 /* Determine type of request (GET/POST) */
1720 urlp = strpbrk(iobuf, " \t");
1722 send_headers_and_exit(HTTP_BAD_REQUEST);
1724 #if ENABLE_FEATURE_HTTPD_CGI
1725 prequest = request_GET;
1726 if (strcasecmp(iobuf, prequest) != 0) {
1728 if (strcasecmp(iobuf, prequest) != 0)
1729 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1732 if (strcasecmp(iobuf, request_GET) != 0)
1733 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1735 urlp = skip_whitespace(urlp);
1737 send_headers_and_exit(HTTP_BAD_REQUEST);
1739 /* Find end of URL and parse HTTP version, if any */
1740 http_major_version = -1;
1741 tptr = strchrnul(urlp, ' ');
1742 /* Is it " HTTP/"? */
1743 if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0)
1744 http_major_version = (tptr[6] - '0');
1747 /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
1748 urlcopy = alloca((tptr - urlp) + sizeof("/index.html"));
1749 /*if (urlcopy == NULL)
1750 * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
1751 strcpy(urlcopy, urlp);
1752 /* NB: urlcopy ptr is never changed after this */
1754 /* Extract url args if present */
1755 tptr = strchr(urlcopy, '?');
1762 /* Decode URL escape sequences */
1763 tptr = decodeString(urlcopy, 0);
1765 send_headers_and_exit(HTTP_BAD_REQUEST);
1766 if (tptr == urlcopy + 1) {
1767 /* '/' or NUL is encoded */
1768 send_headers_and_exit(HTTP_NOT_FOUND);
1771 /* Canonicalize path */
1772 /* Algorithm stolen from libbb bb_simplify_path(),
1773 * but don't strdup and reducing trailing slash and protect out root */
1774 urlp = tptr = urlcopy;
1777 /* skip duplicate (or initial) slash */
1782 /* skip extra '.' */
1783 if (tptr[1] == '/' || !tptr[1]) {
1786 /* '..': be careful */
1787 if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
1789 if (urlp == urlcopy) /* protect root */
1790 send_headers_and_exit(HTTP_BAD_REQUEST);
1791 while (*--urlp != '/') /* omit previous dir */;
1798 *++urlp = '\0'; /* so keep last character */
1799 tptr = urlp; /* end ptr */
1801 /* If URL is a directory, add '/' */
1802 if (tptr[-1] != '/') {
1803 if (is_directory(urlcopy + 1, 1, &sb)) {
1804 found_moved_temporarily = urlcopy;
1810 bb_error_msg("url:%s", urlcopy);
1813 ip_allowed = checkPermIP();
1814 while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
1815 /* have path1/path2 */
1817 if (is_directory(urlcopy + 1, 1, &sb)) {
1818 /* may be having subdir config */
1819 parse_conf(urlcopy + 1, SUBDIR_PARSE);
1820 ip_allowed = checkPermIP();
1824 if (http_major_version >= 0) {
1825 /* Request was with "... HTTP/nXXX", and n >= 0 */
1827 /* Read until blank line for HTTP version specified, else parse immediate */
1829 alarm(HEADER_READ_TIMEOUT);
1831 break; /* EOF or error or empty line */
1833 bb_error_msg("header: '%s'", iobuf);
1835 #if ENABLE_FEATURE_HTTPD_CGI
1836 /* try and do our best to parse more lines */
1837 if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
1838 /* extra read only for POST */
1839 if (prequest != request_GET) {
1840 tptr = iobuf + sizeof("Content-length:") - 1;
1842 send_headers_and_exit(HTTP_BAD_REQUEST);
1844 /* not using strtoul: it ignores leading minus! */
1845 length = strtol(tptr, &tptr, 10);
1846 /* length is "ulong", but we need to pass it to int later */
1847 /* so we check for negative or too large values in one go: */
1848 /* (long -> ulong conv caused negatives to be seen as > INT_MAX) */
1849 if (tptr[0] || errno || length > INT_MAX)
1850 send_headers_and_exit(HTTP_BAD_REQUEST);
1852 } else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
1853 cookie = strdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
1854 } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
1855 content_type = strdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
1856 } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
1857 referer = strdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
1858 } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
1859 user_agent = strdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
1862 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1863 if (STRNCASECMP(iobuf, "Authorization:") == 0) {
1864 /* We only allow Basic credentials.
1865 * It shows up as "Authorization: Basic <userid:password>" where
1866 * the userid:password is base64 encoded.
1868 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
1869 if (STRNCASECMP(tptr, "Basic") != 0)
1871 tptr += sizeof("Basic")-1;
1872 /* decodeBase64() skips whitespace itself */
1874 credentials = checkPerm(urlcopy, tptr);
1876 #endif /* FEATURE_HTTPD_BASIC_AUTH */
1877 #if ENABLE_FEATURE_HTTPD_RANGES
1878 if (STRNCASECMP(iobuf, "Range:") == 0) {
1879 // We know only bytes=NNN-[MMM]
1880 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
1881 if (strncmp(s, "bytes=", 6) == 0) {
1882 s += sizeof("bytes=")-1;
1883 range_start = BB_STRTOOFF(s, &s, 10);
1884 if (s[0] != '-' || range_start < 0) {
1887 range_end = BB_STRTOOFF(s+1, NULL, 10);
1888 if (errno || range_end < range_start)
1894 } /* while extra header reading */
1897 /* We read headers, disable peer timeout */
1900 if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || ip_allowed == 0) {
1901 /* protect listing [/path]/httpd_conf or IP deny */
1902 send_headers_and_exit(HTTP_FORBIDDEN);
1905 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1906 if (credentials <= 0 && checkPerm(urlcopy, ":") == 0) {
1907 send_headers_and_exit(HTTP_UNAUTHORIZED);
1911 if (found_moved_temporarily) {
1912 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
1915 tptr = urlcopy + 1; /* skip first '/' */
1917 #if ENABLE_FEATURE_HTTPD_CGI
1918 if (strncmp(tptr, "cgi-bin/", 8) == 0) {
1919 if (tptr[8] == '\0') {
1920 /* protect listing "cgi-bin/" */
1921 send_headers_and_exit(HTTP_FORBIDDEN);
1923 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
1925 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1927 char *suffix = strrchr(tptr, '.');
1930 for (cur = script_i; cur; cur = cur->next) {
1931 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1932 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
1938 if (prequest != request_GET) {
1939 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1941 #endif /* FEATURE_HTTPD_CGI */
1943 if (urlp[-1] == '/')
1944 strcpy(urlp, "index.html");
1945 if (stat(tptr, &sb) == 0) {
1946 file_size = sb.st_size;
1947 last_mod = sb.st_mtime;
1949 #if ENABLE_FEATURE_HTTPD_CGI
1950 else if (urlp[-1] == '/') {
1951 /* It's a dir URL and there is no index.html
1952 * Try cgi-bin/index.cgi */
1953 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
1956 send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
1961 * fall through to send_file, it errors out if open fails
1965 send_file_and_exit(tptr, TRUE);
1969 * The main http server function.
1970 * Given a socket, listen for new connections and farm out
1971 * the processing as a [v]forked process.
1975 static void mini_httpd(int server_socket) ATTRIBUTE_NORETURN;
1976 static void mini_httpd(int server_socket)
1978 /* NB: it's best to not use xfuncs in this loop before fork().
1979 * Otherwise server may die on transient errors (temporary
1980 * out-of-memory condition, etc), which is Bad(tm).
1981 * Try to do any dangerous calls after fork.
1985 len_and_sockaddr fromAddr;
1987 /* Wait for connections... */
1988 fromAddr.len = LSA_SIZEOF_SA;
1989 n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
1993 /* set the KEEPALIVE option to cull dead connections */
1994 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
1998 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1999 /* Do not reload config on HUP */
2000 signal(SIGHUP, SIG_IGN);
2002 close(server_socket);
2006 handle_incoming_and_exit(&fromAddr);
2008 /* parent, or fork failed */
2014 static void mini_httpd_nommu(int server_socket, int argc, char **argv) ATTRIBUTE_NORETURN;
2015 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2017 char *argv_copy[argc + 2];
2019 argv_copy[0] = argv[0];
2020 argv_copy[1] = (char*)"-i";
2021 memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2023 /* NB: it's best to not use xfuncs in this loop before vfork().
2024 * Otherwise server may die on transient errors (temporary
2025 * out-of-memory condition, etc), which is Bad(tm).
2026 * Try to do any dangerous calls after fork.
2030 len_and_sockaddr fromAddr;
2032 /* Wait for connections... */
2033 fromAddr.len = LSA_SIZEOF_SA;
2034 n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
2038 /* set the KEEPALIVE option to cull dead connections */
2039 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2043 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2044 /* Do not reload config on HUP */
2045 signal(SIGHUP, SIG_IGN);
2047 close(server_socket);
2051 /* Run a copy of ourself in inetd mode */
2054 /* parent, or vfork failed */
2062 * Process a HTTP connection on stdin/out.
2065 static void mini_httpd_inetd(void) ATTRIBUTE_NORETURN;
2066 static void mini_httpd_inetd(void)
2068 len_and_sockaddr fromAddr;
2070 fromAddr.len = LSA_SIZEOF_SA;
2071 getpeername(0, &fromAddr.sa, &fromAddr.len);
2072 handle_incoming_and_exit(&fromAddr);
2075 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2076 static void sighup_handler(int sig)
2078 struct sigaction sa;
2080 parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
2082 memset(&sa, 0, sizeof(sa));
2083 sa.sa_handler = sighup_handler;
2084 /*sigemptyset(&sa.sa_mask); - memset should be enough */
2085 sa.sa_flags = SA_RESTART;
2086 sigaction(SIGHUP, &sa, NULL);
2091 c_opt_config_file = 0,
2094 USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2095 USE_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,)
2096 USE_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,)
2097 USE_FEATURE_HTTPD_SETUID( u_opt_setuid ,)
2102 OPT_CONFIG_FILE = 1 << c_opt_config_file,
2103 OPT_DECODE_URL = 1 << d_opt_decode_url,
2104 OPT_HOME_HTTPD = 1 << h_opt_home_httpd,
2105 OPT_ENCODE_URL = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2106 OPT_REALM = USE_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0,
2107 OPT_MD5 = USE_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0,
2108 OPT_SETUID = USE_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0,
2109 OPT_PORT = 1 << p_opt_port,
2110 OPT_INETD = 1 << p_opt_inetd,
2111 OPT_FOREGROUND = 1 << p_opt_foreground,
2112 OPT_VERBOSE = 1 << p_opt_verbose,
2116 int httpd_main(int argc, char **argv);
2117 int httpd_main(int argc, char **argv)
2119 int server_socket = server_socket; /* for gcc */
2121 char *url_for_decode;
2122 USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2123 USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2124 USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2125 USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2129 #if ENABLE_LOCALE_SUPPORT
2130 /* Undo busybox.c: we want to speak English in http (dates etc) */
2131 setlocale(LC_TIME, "C");
2134 home_httpd = xrealloc_getcwd_or_warn(NULL);
2135 /* -v counts, -i implies -f */
2136 opt_complementary = "vv:if";
2137 /* We do not "absolutize" path given by -h (home) opt.
2138 * If user gives relative path in -h, $SCRIPT_FILENAME can end up
2140 opt = getopt32(argv, "c:d:h:"
2141 USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2142 USE_FEATURE_HTTPD_BASIC_AUTH("r:")
2143 USE_FEATURE_HTTPD_AUTH_MD5("m:")
2144 USE_FEATURE_HTTPD_SETUID("u:")
2146 &configFile, &url_for_decode, &home_httpd
2147 USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2148 USE_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2149 USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
2150 USE_FEATURE_HTTPD_SETUID(, &s_ugid)
2151 , &bind_addr_or_port
2154 if (opt & OPT_DECODE_URL) {
2155 fputs(decodeString(url_for_decode, 1), stdout);
2158 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2159 if (opt & OPT_ENCODE_URL) {
2160 fputs(encodeString(url_for_encode), stdout);
2164 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2165 if (opt & OPT_MD5) {
2166 puts(pw_encrypt(pass, "$1$"));
2170 #if ENABLE_FEATURE_HTTPD_SETUID
2171 if (opt & OPT_SETUID) {
2172 if (!get_uidgid(&ugid, s_ugid, 1))
2173 bb_error_msg_and_die("unrecognized user[:group] "
2174 "name '%s'", s_ugid);
2179 if (!(opt & OPT_FOREGROUND)) {
2180 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2185 if (!(opt & OPT_INETD)) {
2186 signal(SIGCHLD, SIG_IGN);
2187 server_socket = openServer();
2188 #if ENABLE_FEATURE_HTTPD_SETUID
2189 /* drop privileges */
2190 if (opt & OPT_SETUID) {
2191 if (ugid.gid != (gid_t)-1) {
2192 if (setgroups(1, &ugid.gid) == -1)
2193 bb_perror_msg_and_die("setgroups");
2201 #if 0 /*was #if ENABLE_FEATURE_HTTPD_CGI*/
2202 /* User can do it himself: 'env - PATH="$PATH" httpd'
2203 * We don't do it because we don't want to screw users
2205 * 'env - VAR1=val1 VAR2=val2 https'
2206 * and have VAR1 and VAR2 values visible in their CGIs.
2207 * Besides, it is also smaller. */
2209 char *p = getenv("PATH");
2210 /* env strings themself are not freed, no need to strdup(p): */
2214 // if (!(opt & OPT_INETD))
2215 // setenv_long("SERVER_PORT", ???);
2219 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2220 if (!(opt & OPT_INETD))
2222 else /* do not install HUP handler in inetd mode */
2224 parse_conf(default_path_httpd_conf, FIRST_PARSE);
2226 xfunc_error_retval = 0;
2227 if (opt & OPT_INETD)
2230 if (!(opt & OPT_FOREGROUND))
2231 bb_daemonize(0); /* don't change current directory */
2232 mini_httpd(server_socket); /* never returns */
2234 mini_httpd_nommu(server_socket, argc, argv); /* never returns */