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 /* amount of buffering in a pipe */
109 # define PIPE_BUF 4096
112 #define IOBUF_SIZE 8192 /* IO buffer */
114 #define HEADER_READ_TIMEOUT 60
116 static const char default_path_httpd_conf[] ALIGN1 = "/etc";
117 static const char httpd_conf[] ALIGN1 = "httpd.conf";
118 static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
120 typedef struct has_next_ptr {
121 struct has_next_ptr *next;
124 /* Must have "next" as a first member */
125 typedef struct Htaccess {
126 struct Htaccess *next;
128 char before_colon[1]; /* really bigger, must be last */
131 /* Must have "next" as a first member */
132 typedef struct Htaccess_IP {
133 struct Htaccess_IP *next;
141 HTTP_PARTIAL_CONTENT = 206,
142 HTTP_MOVED_TEMPORARILY = 302,
143 HTTP_BAD_REQUEST = 400, /* malformed syntax */
144 HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
145 HTTP_NOT_FOUND = 404,
146 HTTP_FORBIDDEN = 403,
147 HTTP_REQUEST_TIMEOUT = 408,
148 HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */
149 HTTP_INTERNAL_SERVER_ERROR = 500,
151 #if 0 /* future use */
152 HTTP_SWITCHING_PROTOCOLS = 101,
155 HTTP_NON_AUTHORITATIVE_INFO = 203,
156 HTTP_NO_CONTENT = 204,
157 HTTP_MULTIPLE_CHOICES = 300,
158 HTTP_MOVED_PERMANENTLY = 301,
159 HTTP_NOT_MODIFIED = 304,
160 HTTP_PAYMENT_REQUIRED = 402,
161 HTTP_BAD_GATEWAY = 502,
162 HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
163 HTTP_RESPONSE_SETSIZE = 0xffffffff
167 static const uint16_t http_response_type[] ALIGN2 = {
169 #if ENABLE_FEATURE_HTTPD_RANGES
170 HTTP_PARTIAL_CONTENT,
172 HTTP_MOVED_TEMPORARILY,
173 HTTP_REQUEST_TIMEOUT,
174 HTTP_NOT_IMPLEMENTED,
175 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
181 HTTP_INTERNAL_SERVER_ERROR,
182 #if 0 /* not implemented */
186 HTTP_MULTIPLE_CHOICES,
187 HTTP_MOVED_PERMANENTLY,
190 HTTP_SERVICE_UNAVAILABLE,
194 static const struct {
197 } http_response[ARRAY_SIZE(http_response_type)] = {
199 #if ENABLE_FEATURE_HTTPD_RANGES
200 { "Partial Content", NULL },
203 { "Request Timeout", "No request appeared within 60 seconds" },
204 { "Not Implemented", "The requested method is not recognized" },
205 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
206 { "Unauthorized", "" },
208 { "Not Found", "The requested URL was not found" },
209 { "Bad Request", "Unsupported method" },
211 { "Internal Server Error", "Internal Server Error" },
212 #if 0 /* not implemented */
216 { "Multiple Choices" },
217 { "Moved Permanently" },
219 { "Bad Gateway", "" },
220 { "Service Unavailable", "" },
226 int verbose; /* must be int (used by getopt32) */
227 smallint flg_deny_all;
229 unsigned rmt_ip; /* used for IP-based allow/deny rules */
231 char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */
232 const char *bind_addr_or_port;
235 const char *configFile;
236 const char *home_httpd;
238 const char *found_mime_type;
239 const char *found_moved_temporarily;
240 Htaccess_IP *ip_a_d; /* config allow/deny lines */
242 USE_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
243 USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
244 USE_FEATURE_HTTPD_CGI(char *referer;)
245 USE_FEATURE_HTTPD_CGI(char *user_agent;)
247 off_t file_size; /* -1 - unknown */
248 #if ENABLE_FEATURE_HTTPD_RANGES
254 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
255 Htaccess *g_auth; /* config user:password lines */
257 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
258 Htaccess *mime_a; /* config mime types */
260 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
261 Htaccess *script_i; /* config script interpreters */
263 char *iobuf; /* [IOBUF_SIZE] */
264 #define hdr_buf bb_common_bufsiz1
267 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
268 const char *http_error_page[ARRAY_SIZE(http_response_type)];
271 #define G (*ptr_to_globals)
272 #define verbose (G.verbose )
273 #define flg_deny_all (G.flg_deny_all )
274 #define rmt_ip (G.rmt_ip )
275 #define bind_addr_or_port (G.bind_addr_or_port)
276 #define g_query (G.g_query )
277 #define configFile (G.configFile )
278 #define home_httpd (G.home_httpd )
279 #define found_mime_type (G.found_mime_type )
280 #define found_moved_temporarily (G.found_moved_temporarily)
281 #define last_mod (G.last_mod )
282 #define ip_a_d (G.ip_a_d )
283 #define g_realm (G.g_realm )
284 #define remoteuser (G.remoteuser )
285 #define referer (G.referer )
286 #define user_agent (G.user_agent )
287 #define file_size (G.file_size )
288 #if ENABLE_FEATURE_HTTPD_RANGES
289 #define range_start (G.range_start )
290 #define range_end (G.range_end )
291 #define range_len (G.range_len )
293 #define rmt_ip_str (G.rmt_ip_str )
294 #define g_auth (G.g_auth )
295 #define mime_a (G.mime_a )
296 #define script_i (G.script_i )
297 #define iobuf (G.iobuf )
298 #define hdr_ptr (G.hdr_ptr )
299 #define hdr_cnt (G.hdr_cnt )
300 #define http_error_page (G.http_error_page )
301 #define INIT_G() do { \
302 PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
303 USE_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
304 bind_addr_or_port = "80"; \
308 #if !ENABLE_FEATURE_HTTPD_RANGES
311 range_end = MAXINT(off_t) - 1,
312 range_len = MAXINT(off_t),
317 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
320 static void send_file_and_exit(const char *url, int headers) ATTRIBUTE_NORETURN;
322 static void free_llist(has_next_ptr **pptr)
324 has_next_ptr *cur = *pptr;
326 has_next_ptr *t = cur;
333 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
334 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
335 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
336 static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
338 free_llist((has_next_ptr**)pptr);
342 static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
344 free_llist((has_next_ptr**)pptr);
347 /* Returns presumed mask width in bits or < 0 on error.
348 * Updates strp, stores IP at provided pointer */
349 static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
351 const char *p = *strp;
359 for (j = 0; j < 4; j++) {
362 if ((*p < '0' || *p > '9') && *p != '/' && *p)
365 while (*p >= '0' && *p <= '9') {
376 ip = (ip << 8) | octet;
390 /* Returns 0 on success. Stores IP and mask at provided pointers */
391 static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
397 i = scan_ip(&str, ipp, '/');
402 /* there is /xxx after dotted-IP address */
403 i = bb_strtou(str, &p, 10);
405 /* 'xxx' itself is dotted-IP mask, parse it */
406 /* (return 0 (success) only if it has N.N.N.N form) */
407 return scan_ip(&str, maskp, '\0') - 32;
416 if (sizeof(unsigned) == 4 && i == 32) {
417 /* mask >>= 32 below may not work */
423 /* i == 0 -> *maskp = 0x00000000
424 * i == 1 -> *maskp = 0x80000000
425 * i == 4 -> *maskp = 0xf0000000
426 * i == 31 -> *maskp = 0xfffffffe
427 * i == 32 -> *maskp = 0xffffffff */
428 *maskp = (uint32_t)(~mask);
433 * Parse configuration file into in-memory linked list.
435 * The first non-white character is examined to determine if the config line
436 * is one of the following:
437 * .ext:mime/type # new mime type not compiled into httpd
438 * [adAD]:from # ip address allow/deny, * for wildcard
439 * /path:user:pass # username/password
440 * Ennn:error.html # error page for status nnn
442 * Any previous IP rules are discarded.
443 * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
444 * are also discarded. That is, previous settings are retained if flag is
446 * Error pages are only parsed on the main config file.
448 * path Path where to look for httpd.conf (without filename).
449 * flag Type of the parse request.
452 #define FIRST_PARSE 0
453 #define SUBDIR_PARSE 1
454 #define SIGNALED_PARSE 2
455 #define FIND_FROM_HTTPD_ROOT 3
456 static void parse_conf(const char *path, int flag)
459 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
462 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
463 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
464 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
467 const char *cf = configFile;
473 /* discard old rules */
474 free_Htaccess_IP_list(&ip_a_d);
476 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
477 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
478 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
479 /* retain previous auth and mime config only for subdir parse */
480 if (flag != SUBDIR_PARSE) {
481 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
482 free_Htaccess_list(&g_auth);
484 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
485 free_Htaccess_list(&mime_a);
487 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
488 free_Htaccess_list(&script_i);
493 if (flag == SUBDIR_PARSE || cf == NULL) {
494 cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
495 sprintf((char *)cf, "%s/%s", path, httpd_conf);
498 while ((f = fopen(cf, "r")) == NULL) {
499 if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
500 /* config file not found, no changes to config */
503 if (configFile && flag == FIRST_PARSE) /* if -c option given */
504 bb_perror_msg_and_die("%s", cf);
505 flag = FIND_FROM_HTTPD_ROOT;
509 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
512 /* This could stand some work */
513 while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
515 for (p = p0; *p0 != '\0' && *p0 != '#'; p0++) {
518 if (*p0 == ':' && c == NULL)
524 /* test for empty or strange line */
525 if (c == NULL || *c == '\0')
532 /* memorize deny all */
535 /* skip default other "word:*" config lines */
541 if (*p0 == 'A' || *p0 == 'D') {
542 /* storing current config IP line */
543 pip = xzalloc(sizeof(Htaccess_IP));
545 if (scan_ip_mask(c, &(pip->ip), &(pip->mask))) {
546 /* syntax IP{/mask} error detected, protect all */
550 pip->allow_deny = *p0;
552 /* Deny:from_IP move top */
556 /* add to bottom A:form_IP config line */
557 Htaccess_IP *prev_IP = ip_a_d;
559 if (prev_IP == NULL) {
562 while (prev_IP->next)
563 prev_IP = prev_IP->next;
571 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
572 if (flag == FIRST_PARSE && *p0 == 'E') {
574 /* error status code */
575 int status = atoi(++p0);
576 /* c already points at the character following ':' in parse loop */
577 /* c = strchr(p0, ':'); c++; */
578 if (status < HTTP_CONTINUE) {
579 bb_error_msg("config error '%s' in '%s'", buf, cf);
583 /* then error page; find matching status */
584 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
585 if (http_response_type[i] == status) {
586 http_error_page[i] = concat_path_file((*c == '/') ? NULL : home_httpd, c);
594 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
596 /* make full path from httpd root / current_path / config_line_path */
597 cf = (flag == SUBDIR_PARSE ? path : "");
598 p0 = xmalloc(strlen(cf) + (c - buf) + 2 + strlen(c));
600 sprintf(p0, "/%s%s", cf, buf);
602 /* another call bb_simplify_path */
607 if (*cf == '/') { /* skip duplicate (or initial) slash */
609 } else if (*cf == '.') {
610 if (cf[1] == '/' || cf[1] == '\0') { /* remove extra '.' */
612 } else if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == '\0')) {
615 while (*--p != '/') /* omit previous dir */;
624 if ((p == p0) || (*p != '/')) { /* not a trailing slash */
625 ++p; /* so keep last character */
628 sprintf(p0, "%s:%s", p0, c);
632 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
633 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
634 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
635 /* storing current config line */
636 cur = xzalloc(sizeof(Htaccess) + strlen(p0));
638 cf = strcpy(cur->before_colon, p0);
641 cur->after_colon = c;
642 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
644 /* config .mime line move top for overwrite previous */
650 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
651 if (*cf == '*' && cf[1] == '.') {
652 /* config script interpreter line move top for overwrite previous */
653 cur->next = script_i;
658 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
664 /* sort path, if current lenght eq or bigger then move up */
665 Htaccess *prev_hti = g_auth;
666 size_t l = strlen(cf);
669 for (hti = prev_hti; hti; hti = hti->next) {
670 if (l >= strlen(hti->before_colon)) {
671 /* insert before hti */
673 if (prev_hti != hti) {
674 prev_hti->next = cur;
682 prev_hti = prev_hti->next;
684 if (!hti) { /* not inserted, add to bottom */
696 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
698 * Given a string, html-encode special characters.
699 * This is used for the -e command line option to provide an easy way
700 * for scripts to encode result data without confusing browsers. The
701 * returned string pointer is memory allocated by malloc().
703 * Returns a pointer to the encoded string (malloced).
705 static char *encodeString(const char *string)
707 /* take the simple route and encode everything */
708 /* could possibly scan once to get length. */
709 int len = strlen(string);
710 char *out = xmalloc(len * 6 + 1);
714 while ((ch = *string++)) {
715 /* very simple check for what to encode */
719 p += sprintf(p, "&#%d;", (unsigned char) ch);
724 #endif /* FEATURE_HTTPD_ENCODE_URL_STR */
727 * Given a URL encoded string, convert it to plain ascii.
728 * Since decoding always makes strings smaller, the decode is done in-place.
729 * Thus, callers should strdup() the argument if they do not want the
730 * argument modified. The return is the original pointer, allowing this
731 * function to be easily used as arguments to other functions.
733 * string The first string to decode.
734 * option_d 1 if called for httpd -d
736 * Returns a pointer to the decoded string (same as input).
738 static unsigned hex_to_bin(unsigned char c)
745 /* c | 0x20: letters to lower case, non-letters
746 * to (potentially different) non-letters */
747 v = (unsigned)(c | 0x20) - 'a';
753 void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
754 int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
755 t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
757 static char *decodeString(char *orig, int option_d)
759 /* note that decoded string is always shorter than original */
764 while ((c = *ptr++) != '\0') {
767 if (option_d && c == '+') {
775 v = hex_to_bin(ptr[0]);
783 v = (v * 16) | hex_to_bin(ptr[1]);
786 if (!option_d && (v == '/' || v == '\0')) {
787 /* caller takes it as indication of invalid
788 * (dangerous wrt exploits) chars */
798 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
800 * Decode a base64 data stream as per rfc1521.
801 * Note that the rfc states that non base64 chars are to be ignored.
802 * Since the decode always results in a shorter size than the input,
803 * it is OK to pass the input arg as an output arg.
804 * Parameter: a pointer to a base64 encoded string.
805 * Decoded data is stored in-place.
807 static void decodeBase64(char *Data)
809 const unsigned char *in = (const unsigned char *)Data;
810 /* The decoded size will be at most 3/4 the size of the encoded */
817 if (t >= '0' && t <= '9')
819 else if (t >= 'A' && t <= 'Z')
821 else if (t >= 'a' && t <= 'z')
835 *Data++ = (char) (ch >> 16);
836 *Data++ = (char) (ch >> 8);
846 * Create a listen server socket on the designated port.
848 static int openServer(void)
850 int n = bb_strtou(bind_addr_or_port, NULL, 10);
851 if (!errno && n && n <= 0xffff)
852 n = create_and_bind_stream_or_die(NULL, n);
854 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
860 * Log the connection closure and exit.
862 static void log_and_exit(void) ATTRIBUTE_NORETURN;
863 static void log_and_exit(void)
865 /* Paranoia. IE said to be buggy. It may send some extra data
866 * or be confused by us just exiting without SHUT_WR. Oh well. */
867 shutdown(1, SHUT_WR);
869 while (read(0, iobuf, IOBUF_SIZE) > 0)
873 bb_error_msg("closed");
874 _exit(xfunc_error_retval);
878 * Create and send HTTP response headers.
879 * The arguments are combined and sent as one write operation. Note that
880 * IE will puke big-time if the headers are not sent in one packet and the
881 * second packet is delayed for any reason.
882 * responseNum - the result code to send.
884 static void send_headers(int responseNum)
886 static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
888 const char *responseString = "";
889 const char *infoString = NULL;
890 const char *mime_type;
891 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
892 const char *error_page = 0;
895 time_t timer = time(0);
899 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
900 if (http_response_type[i] == responseNum) {
901 responseString = http_response[i].name;
902 infoString = http_response[i].info;
903 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
904 error_page = http_error_page[i];
909 /* error message is HTML */
910 mime_type = responseNum == HTTP_OK ?
911 found_mime_type : "text/html";
914 bb_error_msg("response:%u", responseNum);
916 /* emit the current date */
917 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
919 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
920 "Date: %s\r\nConnection: close\r\n",
921 responseNum, responseString, mime_type, tmp_str);
923 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
924 if (responseNum == HTTP_UNAUTHORIZED) {
925 len += sprintf(iobuf + len,
926 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
930 if (responseNum == HTTP_MOVED_TEMPORARILY) {
931 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
932 found_moved_temporarily,
933 (g_query ? "?" : ""),
934 (g_query ? g_query : ""));
937 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
938 if (error_page && !access(error_page, R_OK)) {
939 strcat(iobuf, "\r\n");
943 fprintf(stderr, "headers: '%s'\n", iobuf);
944 full_write(1, iobuf, len);
946 fprintf(stderr, "writing error page: '%s'\n", error_page);
947 return send_file_and_exit(error_page, FALSE);
951 if (file_size != -1) { /* file */
952 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
953 #if ENABLE_FEATURE_HTTPD_RANGES
954 if (responseNum == HTTP_PARTIAL_CONTENT) {
955 len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n",
959 file_size = range_end - range_start + 1;
962 len += sprintf(iobuf + len,
963 #if ENABLE_FEATURE_HTTPD_RANGES
964 "Accept-Ranges: bytes\r\n"
966 "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
975 len += sprintf(iobuf + len,
976 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
977 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
978 responseNum, responseString,
979 responseNum, responseString, infoString);
982 fprintf(stderr, "headers: '%s'\n", iobuf);
983 if (full_write(1, iobuf, len) != len) {
985 bb_perror_msg("error");
990 static void send_headers_and_exit(int responseNum) ATTRIBUTE_NORETURN;
991 static void send_headers_and_exit(int responseNum)
993 send_headers(responseNum);
998 * Read from the socket until '\n' or EOF. '\r' chars are removed.
999 * '\n' is replaced with NUL.
1000 * Return number of characters read or 0 if nothing is read
1001 * ('\r' and '\n' are not counted).
1002 * Data is returned in iobuf.
1004 static int get_line(void)
1011 hdr_cnt = safe_read(0, hdr_buf, sizeof(hdr_buf));
1016 iobuf[count] = c = *hdr_ptr++;
1022 iobuf[count] = '\0';
1025 if (count < (IOBUF_SIZE - 1)) /* check overflow */
1031 #if ENABLE_FEATURE_HTTPD_CGI
1032 static void setenv1(const char *name, const char *value)
1034 setenv(name, value ? value : "", 1);
1038 * Spawn CGI script, forward CGI's stdin/out <=> network
1040 * Environment variables are set up and the script is invoked with pipes
1041 * for stdin/stdout. If a post is being done the script is fed the POST
1042 * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1045 * const char *url The requested URL (with leading /).
1046 * int bodyLen Length of the post body.
1047 * const char *cookie For set HTTP_COOKIE.
1048 * const char *content_type For set CONTENT_TYPE.
1050 static void send_cgi_and_exit(
1052 const char *request,
1055 const char *content_type) ATTRIBUTE_NORETURN;
1056 static void send_cgi_and_exit(
1058 const char *request,
1061 const char *content_type)
1063 struct { int rd; int wr; } fromCgi; /* CGI -> httpd pipe */
1064 struct { int rd; int wr; } toCgi; /* httpd -> CGI pipe */
1073 * We are mucking with environment _first_ and then vfork/exec,
1074 * this allows us to use vfork safely. Parent don't care about
1075 * these environment changes anyway.
1081 purl = xstrdup(url);
1083 while ((script = strchr(script + 1, '/')) != NULL) {
1084 /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
1088 if (!is_directory(purl + 1, 1, &sb)) {
1089 /* not directory, found script.cgi/PATH_INFO */
1093 *script = '/'; /* is directory, find next '/' */
1095 setenv1("PATH_INFO", script); /* set /PATH_INFO or "" */
1096 setenv1("REQUEST_METHOD", request);
1098 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", purl, g_query));
1100 setenv1("REQUEST_URI", purl);
1103 *script = '\0'; /* cut off /PATH_INFO */
1105 /* SCRIPT_FILENAME required by PHP in CGI mode */
1106 fullpath = concat_path_file(home_httpd, purl);
1107 setenv1("SCRIPT_FILENAME", fullpath);
1108 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1109 setenv1("SCRIPT_NAME", purl);
1110 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1111 * QUERY_STRING: The information which follows the ? in the URL
1112 * which referenced this script. This is the query information.
1113 * It should not be decoded in any fashion. This variable
1114 * should always be set when there is query information,
1115 * regardless of command line decoding. */
1116 /* (Older versions of bbox seem to do some decoding) */
1117 setenv1("QUERY_STRING", g_query);
1118 putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1119 putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1120 putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1121 /* Having _separate_ variables for IP and port defeats
1122 * the purpose of having socket abstraction. Which "port"
1123 * are you using on Unix domain socket?
1124 * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1127 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1128 char *cp = strrchr(p, ':');
1129 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1131 if (cp) *cp = '\0'; /* delete :PORT */
1132 setenv1("REMOTE_ADDR", p);
1135 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1136 setenv1("REMOTE_PORT", cp + 1);
1140 setenv1("HTTP_USER_AGENT", user_agent);
1142 putenv(xasprintf("CONTENT_LENGTH=%d", bodyLen));
1144 setenv1("HTTP_COOKIE", cookie);
1146 setenv1("CONTENT_TYPE", content_type);
1147 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1149 setenv1("REMOTE_USER", remoteuser);
1150 putenv((char*)"AUTH_TYPE=Basic");
1154 setenv1("HTTP_REFERER", referer);
1161 /* TODO: log perror? */
1167 xfunc_error_retval = 242;
1169 xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */
1170 xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */
1173 /* User seeing stderr output can be a security problem.
1174 * If CGI really wants that, it can always do dup itself. */
1177 /* script must have absolute path */
1178 script = strrchr(fullpath, '/');
1180 goto error_execing_cgi;
1182 /* chdiring to script's dir */
1183 if (chdir(fullpath) == 0) {
1185 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1186 char *interpr = NULL;
1187 char *suffix = strrchr(purl, '.');
1191 for (cur = script_i; cur; cur = cur->next) {
1192 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1193 interpr = cur->after_colon;
1200 /* set argv[0] to name without path */
1201 argv[0] = (char*)bb_basename(purl);
1203 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1205 execv(interpr, argv);
1208 execv(fullpath, argv);
1212 * (we are CGI here, our stdout is pumped to the net) */
1213 send_headers_and_exit(HTTP_NOT_FOUND);
1216 /* Parent process */
1218 /* First, restore variables possibly changed by child */
1219 xfunc_error_retval = 0;
1221 /* Prepare for pumping data.
1222 * iobuf is used for CGI -> network data,
1223 * hdr_buf is for network -> CGI data (POSTDATA) */
1228 /* If CGI dies, we still want to correctly finish reading its output
1229 * and send it to the peer. So please no SIGPIPEs! */
1230 signal(SIGPIPE, SIG_IGN);
1232 /* This loop still looks messy. What is an exit criteria?
1233 * "CGI's output closed"? Or "CGI has exited"?
1234 * What to do if CGI has closed both input and output, but
1235 * didn't exit? etc... */
1237 /* NB: breaking out of this loop jumps to log_and_exit() */
1246 FD_SET(fromCgi.rd, &readSet);
1247 if (bodyLen > 0 || hdr_cnt > 0) {
1248 FD_SET(toCgi.wr, &writeSet);
1249 nfound = toCgi.wr > fromCgi.rd ? toCgi.wr : fromCgi.rd;
1251 FD_SET(0, &readSet);
1252 /* Now wait on the set of sockets! */
1253 nfound = select(nfound + 1, &readSet, &writeSet, NULL, NULL);
1256 close(toCgi.wr); /* no more POST data to CGI */
1259 nfound = select(fromCgi.rd + 1, &readSet, NULL, NULL, NULL);
1263 if (waitpid(pid, &status, WNOHANG) <= 0) {
1264 /* Weird. CGI didn't exit and no fd's
1265 * are ready, yet select returned?! */
1269 if (DEBUG && WIFEXITED(status))
1270 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1271 if (DEBUG && WIFSIGNALED(status))
1272 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1276 if (hdr_cnt > 0 && FD_ISSET(toCgi.wr, &writeSet)) {
1277 /* Have data from peer and can write to CGI */
1278 count = safe_write(toCgi.wr, hdr_ptr, hdr_cnt);
1279 /* Doesn't happen, we dont use nonblocking IO here
1280 *if (count < 0 && errno == EAGAIN) {
1287 hdr_cnt = bodyLen = 0; /* EOF/broken pipe to CGI */
1289 } else if (bodyLen > 0 && hdr_cnt == 0
1290 && FD_ISSET(0, &readSet)
1292 /* We expect data, prev data portion is eaten by CGI
1293 * and there *is* data to read from the peer
1295 count = bodyLen > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : bodyLen;
1296 count = safe_read(0, hdr_buf, count);
1302 bodyLen = 0; /* closed */
1306 #define PIPESIZE PIPE_BUF
1307 #if PIPESIZE >= IOBUF_SIZE
1308 # error "PIPESIZE >= IOBUF_SIZE"
1310 if (FD_ISSET(fromCgi.rd, &readSet)) {
1311 /* There is something to read from CGI */
1314 /* Are we still buffering CGI output? */
1315 if (buf_count >= 0) {
1316 /* HTTP_200[] has single "\r\n" at the end.
1317 * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1318 * CGI scripts MUST send their own header terminated by
1319 * empty line, then data. That's why we have only one
1320 * <cr><lf> pair here. We will output "200 OK" line
1321 * if needed, but CGI still has to provide blank line
1322 * between header and body */
1324 /* Must use safe_read, not full_read, because
1325 * CGI may output a few first bytes and then wait
1326 * for POSTDATA without closing stdout.
1327 * With full_read we may wait here forever. */
1328 count = safe_read(fromCgi.rd, rbuf + buf_count, PIPESIZE - 8);
1330 /* eof (or error) and there was no "HTTP",
1331 * so write it, then write received data */
1333 full_write(1, HTTP_200, sizeof(HTTP_200)-1);
1334 full_write(1, rbuf, buf_count);
1336 break; /* CGI stdout is closed, exiting */
1340 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1341 if (buf_count >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1342 /* send "HTTP/1.0 " */
1343 if (full_write(1, HTTP_200, 9) != 9)
1345 rbuf += 8; /* skip "Status: " */
1346 count = buf_count - 8;
1347 buf_count = -1; /* buffering off */
1348 } else if (buf_count >= 4) {
1349 /* Did CGI add "HTTP"? */
1350 if (memcmp(rbuf, HTTP_200, 4) != 0) {
1351 /* there is no "HTTP", do it ourself */
1352 if (full_write(1, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1356 if (!strstr(rbuf, "ontent-")) {
1357 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1359 * Counter-example of valid CGI without Content-type:
1360 * echo -en "HTTP/1.0 302 Found\r\n"
1361 * echo -en "Location: http://www.busybox.net\r\n"
1365 buf_count = -1; /* buffering off */
1368 count = safe_read(fromCgi.rd, rbuf, PIPESIZE);
1370 break; /* eof (or error) */
1372 if (full_write(1, rbuf, count) != count)
1375 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1376 } /* if (FD_ISSET(fromCgi.rd)) */
1380 #endif /* FEATURE_HTTPD_CGI */
1383 * Send a file response to a HTTP request, and exit
1386 * const char *url The requested URL (with leading /).
1387 * headers Don't send headers before if FALSE.
1389 static void send_file_and_exit(const char *url, int headers)
1391 static const char *const suffixTable[] = {
1392 /* Warning: shorter equivalent suffix in one line must be first */
1393 ".htm.html", "text/html",
1394 ".jpg.jpeg", "image/jpeg",
1395 ".gif", "image/gif",
1396 ".png", "image/png",
1397 ".txt.h.c.cc.cpp", "text/plain",
1399 ".wav", "audio/wav",
1400 ".avi", "video/x-msvideo",
1401 ".qt.mov", "video/quicktime",
1402 ".mpe.mpeg", "video/mpeg",
1403 ".mid.midi", "audio/midi",
1404 ".mp3", "audio/mpeg",
1405 #if 0 /* unpopular */
1406 ".au", "audio/basic",
1407 ".pac", "application/x-ns-proxy-autoconfig",
1408 ".vrml.wrl", "model/vrml",
1415 const char *const *table;
1416 const char *try_suffix;
1418 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1422 suffix = strrchr(url, '.');
1424 /* If not found, set default as "application/octet-stream"; */
1425 found_mime_type = "application/octet-stream";
1427 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1430 for (table = suffixTable; *table; table += 2) {
1431 try_suffix = strstr(table[0], suffix);
1433 try_suffix += strlen(suffix);
1434 if (*try_suffix == '\0' || *try_suffix == '.') {
1435 found_mime_type = table[1];
1440 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1441 for (cur = mime_a; cur; cur = cur->next) {
1442 if (strcmp(cur->before_colon, suffix) == 0) {
1443 found_mime_type = cur->after_colon;
1451 bb_error_msg("sending file '%s' content-type: %s",
1452 url, found_mime_type);
1454 f = open(url, O_RDONLY);
1457 bb_perror_msg("cannot open '%s'", url);
1459 send_headers_and_exit(HTTP_NOT_FOUND);
1461 #if ENABLE_FEATURE_HTTPD_RANGES
1463 range_start = 0; /* err pages and ranges don't mix */
1464 range_len = MAXINT(off_t);
1467 range_end = file_size - 1;
1469 if (range_end < range_start
1470 || lseek(f, range_start, SEEK_SET) != range_start
1472 lseek(f, 0, SEEK_SET);
1475 range_len = range_end - range_start + 1;
1476 send_headers(HTTP_PARTIAL_CONTENT);
1483 send_headers(HTTP_OK);
1485 /* If you want to know about EPIPE below
1486 * (happens if you abort downloads from local httpd): */
1487 signal(SIGPIPE, SIG_IGN);
1489 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1490 offset = range_start;
1492 /* sz is rounded down to 64k */
1493 ssize_t sz = MAXINT(ssize_t) - 0xffff;
1494 USE_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1495 count = sendfile(1, f, &offset, sz);
1497 if (offset == range_start)
1501 USE_FEATURE_HTTPD_RANGES(range_len -= sz;)
1502 } while (count > 0 && range_len);
1507 while ((count = safe_read(f, iobuf, IOBUF_SIZE)) > 0) {
1509 USE_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1510 n = full_write(1, iobuf, count);
1513 USE_FEATURE_HTTPD_RANGES(range_len -= count;)
1517 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1520 if (count < 0 && verbose > 1)
1521 bb_perror_msg("error");
1525 static int checkPermIP(void)
1529 /* This could stand some work */
1530 for (cur = ip_a_d; cur; cur = cur->next) {
1533 "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1535 (unsigned char)(cur->ip >> 24),
1536 (unsigned char)(cur->ip >> 16),
1537 (unsigned char)(cur->ip >> 8),
1538 (unsigned char)(cur->ip),
1539 (unsigned char)(cur->mask >> 24),
1540 (unsigned char)(cur->mask >> 16),
1541 (unsigned char)(cur->mask >> 8),
1542 (unsigned char)(cur->mask)
1545 if ((rmt_ip & cur->mask) == cur->ip)
1546 return cur->allow_deny == 'A'; /* Allow/Deny */
1549 /* if unconfigured, return 1 - access from all */
1550 return !flg_deny_all;
1553 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1555 * Check the permission file for access password protected.
1557 * If config file isn't present, everything is allowed.
1558 * Entries are of the form you can see example from header source
1560 * path The file path.
1561 * request User information to validate.
1563 * Returns 1 if request is OK.
1565 static int checkPerm(const char *path, const char *request)
1571 const char *prev = NULL;
1573 /* This could stand some work */
1574 for (cur = g_auth; cur; cur = cur->next) {
1577 p0 = cur->before_colon;
1578 if (prev != NULL && strcmp(prev, p0) != 0)
1579 continue; /* find next identical */
1580 p = cur->after_colon;
1582 fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
1585 if (strncmp(p0, path, l) == 0
1586 && (l == 1 || path[l] == '/' || path[l] == '\0')
1589 /* path match found. Check request */
1590 /* for check next /path:user:password */
1592 u = strchr(request, ':');
1594 /* bad request, ':' required */
1598 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1602 if (strncmp(p, request, u - request) != 0) {
1603 /* user doesn't match */
1606 pp = strchr(p, ':');
1607 if (pp && pp[1] == '$' && pp[2] == '1'
1608 && pp[3] == '$' && pp[4]
1611 cipher = pw_encrypt(u+1, pp);
1612 if (strcmp(cipher, pp) == 0)
1613 goto set_remoteuser_var; /* Ok */
1619 if (strcmp(p, request) == 0) {
1621 remoteuser = strdup(request);
1623 remoteuser[u - request] = '\0';
1630 return prev == NULL;
1632 #endif /* FEATURE_HTTPD_BASIC_AUTH */
1637 static void exit_on_signal(int sig) ATTRIBUTE_NORETURN;
1638 static void exit_on_signal(int sig)
1640 send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1644 * Handle an incoming http request and exit.
1646 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) ATTRIBUTE_NORETURN;
1647 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1649 static const char request_GET[] ALIGN1 = "GET";
1655 int http_major_version;
1657 #if ENABLE_FEATURE_HTTPD_CGI
1658 const char *prequest;
1659 unsigned long length = 0;
1661 char *content_type = 0;
1663 struct sigaction sa;
1664 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1665 int credentials = -1; /* if not required this is Ok */
1668 /* Allocation of iobuf is postponed until now
1669 * (IOW, server process doesn't need to waste 8k) */
1670 iobuf = xmalloc(IOBUF_SIZE);
1673 if (fromAddr->sa.sa_family == AF_INET) {
1674 rmt_ip = ntohl(fromAddr->sin.sin_addr.s_addr);
1676 if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1677 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->sa);
1680 /* this trick makes -v logging much simpler */
1681 applet_name = rmt_ip_str;
1683 bb_error_msg("connected");
1686 /* Install timeout handler */
1687 memset(&sa, 0, sizeof(sa));
1688 sa.sa_handler = exit_on_signal;
1689 /* sigemptyset(&sa.sa_mask); - memset should be enough */
1690 /*sa.sa_flags = 0; - no SA_RESTART */
1691 sigaction(SIGALRM, &sa, NULL);
1692 alarm(HEADER_READ_TIMEOUT);
1694 if (!get_line()) /* EOF or error or empty line */
1695 send_headers_and_exit(HTTP_BAD_REQUEST);
1697 /* Determine type of request (GET/POST) */
1698 urlp = strpbrk(iobuf, " \t");
1700 send_headers_and_exit(HTTP_BAD_REQUEST);
1702 #if ENABLE_FEATURE_HTTPD_CGI
1703 prequest = request_GET;
1704 if (strcasecmp(iobuf, prequest) != 0) {
1706 if (strcasecmp(iobuf, prequest) != 0)
1707 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1710 if (strcasecmp(iobuf, request_GET) != 0)
1711 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1713 urlp = skip_whitespace(urlp);
1715 send_headers_and_exit(HTTP_BAD_REQUEST);
1717 /* Find end of URL and parse HTTP version, if any */
1718 http_major_version = -1;
1719 tptr = strchrnul(urlp, ' ');
1720 /* Is it " HTTP/"? */
1721 if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0)
1722 http_major_version = (tptr[6] - '0');
1725 /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
1726 urlcopy = alloca((tptr - urlp) + sizeof("/index.html"));
1727 /*if (urlcopy == NULL)
1728 * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
1729 strcpy(urlcopy, urlp);
1730 /* NB: urlcopy ptr is never changed after this */
1732 /* Extract url args if present */
1733 tptr = strchr(urlcopy, '?');
1740 /* Decode URL escape sequences */
1741 tptr = decodeString(urlcopy, 0);
1743 send_headers_and_exit(HTTP_BAD_REQUEST);
1744 if (tptr == urlcopy + 1) {
1745 /* '/' or NUL is encoded */
1746 send_headers_and_exit(HTTP_NOT_FOUND);
1749 /* Canonicalize path */
1750 /* Algorithm stolen from libbb bb_simplify_path(),
1751 * but don't strdup and reducing trailing slash and protect out root */
1752 urlp = tptr = urlcopy;
1755 /* skip duplicate (or initial) slash */
1760 /* skip extra '.' */
1761 if (tptr[1] == '/' || !tptr[1]) {
1764 /* '..': be careful */
1765 if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
1767 if (urlp == urlcopy) /* protect root */
1768 send_headers_and_exit(HTTP_BAD_REQUEST);
1769 while (*--urlp != '/') /* omit previous dir */;
1776 *++urlp = '\0'; /* so keep last character */
1777 tptr = urlp; /* end ptr */
1779 /* If URL is a directory, add '/' */
1780 if (tptr[-1] != '/') {
1781 if (is_directory(urlcopy + 1, 1, &sb)) {
1782 found_moved_temporarily = urlcopy;
1788 bb_error_msg("url:%s", urlcopy);
1791 ip_allowed = checkPermIP();
1792 while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
1793 /* have path1/path2 */
1795 if (is_directory(urlcopy + 1, 1, &sb)) {
1796 /* may be having subdir config */
1797 parse_conf(urlcopy + 1, SUBDIR_PARSE);
1798 ip_allowed = checkPermIP();
1802 if (http_major_version >= 0) {
1803 /* Request was with "... HTTP/nXXX", and n >= 0 */
1805 /* Read until blank line for HTTP version specified, else parse immediate */
1807 alarm(HEADER_READ_TIMEOUT);
1809 break; /* EOF or error or empty line */
1811 bb_error_msg("header: '%s'", iobuf);
1813 #if ENABLE_FEATURE_HTTPD_CGI
1814 /* try and do our best to parse more lines */
1815 if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
1816 /* extra read only for POST */
1817 if (prequest != request_GET) {
1818 tptr = iobuf + sizeof("Content-length:") - 1;
1820 send_headers_and_exit(HTTP_BAD_REQUEST);
1822 /* not using strtoul: it ignores leading minus! */
1823 length = strtol(tptr, &tptr, 10);
1824 /* length is "ulong", but we need to pass it to int later */
1825 /* so we check for negative or too large values in one go: */
1826 /* (long -> ulong conv caused negatives to be seen as > INT_MAX) */
1827 if (tptr[0] || errno || length > INT_MAX)
1828 send_headers_and_exit(HTTP_BAD_REQUEST);
1830 } else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
1831 cookie = strdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
1832 } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
1833 content_type = strdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
1834 } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
1835 referer = strdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
1836 } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
1837 user_agent = strdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
1840 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1841 if (STRNCASECMP(iobuf, "Authorization:") == 0) {
1842 /* We only allow Basic credentials.
1843 * It shows up as "Authorization: Basic <userid:password>" where
1844 * the userid:password is base64 encoded.
1846 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
1847 if (STRNCASECMP(tptr, "Basic") != 0)
1849 tptr += sizeof("Basic")-1;
1850 /* decodeBase64() skips whitespace itself */
1852 credentials = checkPerm(urlcopy, tptr);
1854 #endif /* FEATURE_HTTPD_BASIC_AUTH */
1855 #if ENABLE_FEATURE_HTTPD_RANGES
1856 if (STRNCASECMP(iobuf, "Range:") == 0) {
1857 // We know only bytes=NNN-[MMM]
1858 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
1859 if (strncmp(s, "bytes=", 6) == 0) {
1860 s += sizeof("bytes=")-1;
1861 range_start = BB_STRTOOFF(s, &s, 10);
1862 if (s[0] != '-' || range_start < 0) {
1865 range_end = BB_STRTOOFF(s+1, NULL, 10);
1866 if (errno || range_end < range_start)
1872 } /* while extra header reading */
1875 /* We read headers, disable peer timeout */
1878 if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || ip_allowed == 0) {
1879 /* protect listing [/path]/httpd_conf or IP deny */
1880 send_headers_and_exit(HTTP_FORBIDDEN);
1883 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1884 if (credentials <= 0 && checkPerm(urlcopy, ":") == 0) {
1885 send_headers_and_exit(HTTP_UNAUTHORIZED);
1889 if (found_moved_temporarily) {
1890 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
1893 tptr = urlcopy + 1; /* skip first '/' */
1895 #if ENABLE_FEATURE_HTTPD_CGI
1896 if (strncmp(tptr, "cgi-bin/", 8) == 0) {
1897 if (tptr[8] == '\0') {
1898 /* protect listing "cgi-bin/" */
1899 send_headers_and_exit(HTTP_FORBIDDEN);
1901 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
1903 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1905 char *suffix = strrchr(tptr, '.');
1908 for (cur = script_i; cur; cur = cur->next) {
1909 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1910 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
1916 if (prequest != request_GET) {
1917 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1919 #endif /* FEATURE_HTTPD_CGI */
1921 if (urlp[-1] == '/')
1922 strcpy(urlp, "index.html");
1923 if (stat(tptr, &sb) == 0) {
1924 file_size = sb.st_size;
1925 last_mod = sb.st_mtime;
1927 #if ENABLE_FEATURE_HTTPD_CGI
1928 else if (urlp[-1] == '/') {
1929 /* It's a dir URL and there is no index.html
1930 * Try cgi-bin/index.cgi */
1931 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
1934 send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
1939 * fall through to send_file, it errors out if open fails
1943 send_file_and_exit(tptr, TRUE);
1947 * The main http server function.
1948 * Given a socket, listen for new connections and farm out
1949 * the processing as a [v]forked process.
1953 static void mini_httpd(int server_socket) ATTRIBUTE_NORETURN;
1954 static void mini_httpd(int server_socket)
1956 /* NB: it's best to not use xfuncs in this loop before fork().
1957 * Otherwise server may die on transient errors (temporary
1958 * out-of-memory condition, etc), which is Bad(tm).
1959 * Try to do any dangerous calls after fork.
1963 len_and_sockaddr fromAddr;
1965 /* Wait for connections... */
1966 fromAddr.len = LSA_SIZEOF_SA;
1967 n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
1971 /* set the KEEPALIVE option to cull dead connections */
1972 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
1976 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1977 /* Do not reload config on HUP */
1978 signal(SIGHUP, SIG_IGN);
1980 close(server_socket);
1984 handle_incoming_and_exit(&fromAddr);
1986 /* parent, or fork failed */
1992 static void mini_httpd_nommu(int server_socket, int argc, char **argv) ATTRIBUTE_NORETURN;
1993 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
1995 char *argv_copy[argc + 2];
1997 argv_copy[0] = argv[0];
1998 argv_copy[1] = (char*)"-i";
1999 memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2001 /* NB: it's best to not use xfuncs in this loop before vfork().
2002 * Otherwise server may die on transient errors (temporary
2003 * out-of-memory condition, etc), which is Bad(tm).
2004 * Try to do any dangerous calls after fork.
2008 len_and_sockaddr fromAddr;
2010 /* Wait for connections... */
2011 fromAddr.len = LSA_SIZEOF_SA;
2012 n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
2016 /* set the KEEPALIVE option to cull dead connections */
2017 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2021 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2022 /* Do not reload config on HUP */
2023 signal(SIGHUP, SIG_IGN);
2025 close(server_socket);
2029 /* Run a copy of ourself in inetd mode */
2032 /* parent, or vfork failed */
2040 * Process a HTTP connection on stdin/out.
2043 static void mini_httpd_inetd(void) ATTRIBUTE_NORETURN;
2044 static void mini_httpd_inetd(void)
2046 len_and_sockaddr fromAddr;
2048 fromAddr.len = LSA_SIZEOF_SA;
2049 getpeername(0, &fromAddr.sa, &fromAddr.len);
2050 handle_incoming_and_exit(&fromAddr);
2053 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2054 static void sighup_handler(int sig)
2056 struct sigaction sa;
2058 parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
2060 memset(&sa, 0, sizeof(sa));
2061 sa.sa_handler = sighup_handler;
2062 /*sigemptyset(&sa.sa_mask); - memset should be enough */
2063 sa.sa_flags = SA_RESTART;
2064 sigaction(SIGHUP, &sa, NULL);
2069 c_opt_config_file = 0,
2072 USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2073 USE_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,)
2074 USE_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,)
2075 USE_FEATURE_HTTPD_SETUID( u_opt_setuid ,)
2080 OPT_CONFIG_FILE = 1 << c_opt_config_file,
2081 OPT_DECODE_URL = 1 << d_opt_decode_url,
2082 OPT_HOME_HTTPD = 1 << h_opt_home_httpd,
2083 OPT_ENCODE_URL = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2084 OPT_REALM = USE_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0,
2085 OPT_MD5 = USE_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0,
2086 OPT_SETUID = USE_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0,
2087 OPT_PORT = 1 << p_opt_port,
2088 OPT_INETD = 1 << p_opt_inetd,
2089 OPT_FOREGROUND = 1 << p_opt_foreground,
2090 OPT_VERBOSE = 1 << p_opt_verbose,
2094 int httpd_main(int argc, char **argv);
2095 int httpd_main(int argc, char **argv)
2097 int server_socket = server_socket; /* for gcc */
2099 char *url_for_decode;
2100 USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2101 USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2102 USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2103 USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2107 #if ENABLE_LOCALE_SUPPORT
2108 /* Undo busybox.c: we want to speak English in http (dates etc) */
2109 setlocale(LC_TIME, "C");
2112 home_httpd = xrealloc_getcwd_or_warn(NULL);
2113 /* -v counts, -i implies -f */
2114 opt_complementary = "vv:if";
2115 /* We do not "absolutize" path given by -h (home) opt.
2116 * If user gives relative path in -h, $SCRIPT_FILENAME can end up
2118 opt = getopt32(argv, "c:d:h:"
2119 USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2120 USE_FEATURE_HTTPD_BASIC_AUTH("r:")
2121 USE_FEATURE_HTTPD_AUTH_MD5("m:")
2122 USE_FEATURE_HTTPD_SETUID("u:")
2124 &configFile, &url_for_decode, &home_httpd
2125 USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2126 USE_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2127 USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
2128 USE_FEATURE_HTTPD_SETUID(, &s_ugid)
2129 , &bind_addr_or_port
2132 if (opt & OPT_DECODE_URL) {
2133 fputs(decodeString(url_for_decode, 1), stdout);
2136 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2137 if (opt & OPT_ENCODE_URL) {
2138 fputs(encodeString(url_for_encode), stdout);
2142 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2143 if (opt & OPT_MD5) {
2144 puts(pw_encrypt(pass, "$1$"));
2148 #if ENABLE_FEATURE_HTTPD_SETUID
2149 if (opt & OPT_SETUID) {
2150 if (!get_uidgid(&ugid, s_ugid, 1))
2151 bb_error_msg_and_die("unrecognized user[:group] "
2152 "name '%s'", s_ugid);
2157 if (!(opt & OPT_FOREGROUND)) {
2158 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2163 if (!(opt & OPT_INETD)) {
2164 signal(SIGCHLD, SIG_IGN);
2165 server_socket = openServer();
2166 #if ENABLE_FEATURE_HTTPD_SETUID
2167 /* drop privileges */
2168 if (opt & OPT_SETUID) {
2169 if (ugid.gid != (gid_t)-1) {
2170 if (setgroups(1, &ugid.gid) == -1)
2171 bb_perror_msg_and_die("setgroups");
2179 #if 0 /*was #if ENABLE_FEATURE_HTTPD_CGI*/
2180 /* User can do it himself: 'env - PATH="$PATH" httpd'
2181 * We don't do it because we don't want to screw users
2183 * 'env - VAR1=val1 VAR2=val2 https'
2184 * and have VAR1 and VAR2 values visible in their CGIs.
2185 * Besides, it is also smaller. */
2187 char *p = getenv("PATH");
2188 /* env strings themself are not freed, no need to strdup(p): */
2192 // if (!(opt & OPT_INETD))
2193 // setenv_long("SERVER_PORT", ???);
2197 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2198 if (!(opt & OPT_INETD))
2200 else /* do not install HUP handler in inetd mode */
2202 parse_conf(default_path_httpd_conf, FIRST_PARSE);
2204 xfunc_error_retval = 0;
2205 if (opt & OPT_INETD)
2208 if (!(opt & OPT_FOREGROUND))
2209 bb_daemonize(0); /* don't change current directory */
2210 mini_httpd(server_socket); /* never returns */
2212 mini_httpd_nommu(server_socket, argc, argv); /* never returns */