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 * I:index.html # Show index.html when a directory is requested
48 * P:/url:[http://]hostname[:port]/new/path
49 * # When /urlXXXXXX is requested, reverse proxy
50 * # it to http://hostname[:port]/new/pathXXXXXX
52 * /cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/
53 * /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/
54 * /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/
55 * .au:audio/basic # additional mime type for audio.au files
56 * *.php:/path/php # running cgi.php scripts through an interpreter
58 * A/D may be as a/d or allow/deny - first char case insensitive
59 * Deny IP rules take precedence over allow rules.
62 * The Deny/Allow IP logic:
64 * - Default is to allow all. No addresses are denied unless
65 * denied with a D: rule.
66 * - Order of Deny/Allow rules is significant
67 * - Deny rules take precedence over allow rules.
68 * - If a deny all rule (D:*) is used it acts as a catch-all for unmatched
70 * - Specification of Allow all (A:*) is a no-op
73 * 1. Allow only specified addresses
74 * A:172.20 # Allow any address that begins with 172.20.
75 * A:10.10. # Allow any address that begins with 10.10.
76 * A:127.0.0.1 # Allow local loopback connections
77 * D:* # Deny from other IP connections
79 * 2. Only deny specified addresses
80 * D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255
81 * D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255
82 * A:* # (optional line added for clarity)
84 * If a sub directory contains a config file it is parsed and merged with
85 * any existing settings as if it was appended to the original configuration.
87 * subdir paths are relative to the containing subdir and thus cannot
88 * affect the parent rules.
90 * Note that since the sub dir is parsed in the forked thread servicing the
91 * subdir http request, any merge is discarded when the process exits. As a
92 * result, the subdir settings only have a lifetime of a single request.
94 * Custom error pages can contain an absolute path or be relative to
95 * 'home_httpd'. Error pages are to be static files (no CGI or script). Error
96 * page can only be defined in the root configuration file and are not taken
97 * into account in local (directories) config files.
99 * If -c is not set, an attempt will be made to open the default
100 * root configuration file. If -c is set and the file is not found, the
101 * server exits with an error.
106 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
107 #include <sys/sendfile.h>
113 #define IOBUF_SIZE 8192 /* IO buffer */
115 /* amount of buffering in a pipe */
117 # define PIPE_BUF 4096
119 #if PIPE_BUF >= IOBUF_SIZE
120 # error "PIPE_BUF >= IOBUF_SIZE"
123 #define HEADER_READ_TIMEOUT 60
125 static const char default_path_httpd_conf[] ALIGN1 = "/etc";
126 static const char httpd_conf[] ALIGN1 = "httpd.conf";
127 static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
129 typedef struct has_next_ptr {
130 struct has_next_ptr *next;
133 /* Must have "next" as a first member */
134 typedef struct Htaccess {
135 struct Htaccess *next;
137 char before_colon[1]; /* really bigger, must be last */
140 /* Must have "next" as a first member */
141 typedef struct Htaccess_IP {
142 struct Htaccess_IP *next;
148 /* Must have "next" as a first member */
149 typedef struct Htaccess_Proxy {
150 struct Htaccess_Proxy *next;
158 HTTP_PARTIAL_CONTENT = 206,
159 HTTP_MOVED_TEMPORARILY = 302,
160 HTTP_BAD_REQUEST = 400, /* malformed syntax */
161 HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
162 HTTP_NOT_FOUND = 404,
163 HTTP_FORBIDDEN = 403,
164 HTTP_REQUEST_TIMEOUT = 408,
165 HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */
166 HTTP_INTERNAL_SERVER_ERROR = 500,
168 #if 0 /* future use */
169 HTTP_SWITCHING_PROTOCOLS = 101,
172 HTTP_NON_AUTHORITATIVE_INFO = 203,
173 HTTP_NO_CONTENT = 204,
174 HTTP_MULTIPLE_CHOICES = 300,
175 HTTP_MOVED_PERMANENTLY = 301,
176 HTTP_NOT_MODIFIED = 304,
177 HTTP_PAYMENT_REQUIRED = 402,
178 HTTP_BAD_GATEWAY = 502,
179 HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
180 HTTP_RESPONSE_SETSIZE = 0xffffffff
184 static const uint16_t http_response_type[] ALIGN2 = {
186 #if ENABLE_FEATURE_HTTPD_RANGES
187 HTTP_PARTIAL_CONTENT,
189 HTTP_MOVED_TEMPORARILY,
190 HTTP_REQUEST_TIMEOUT,
191 HTTP_NOT_IMPLEMENTED,
192 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
198 HTTP_INTERNAL_SERVER_ERROR,
199 #if 0 /* not implemented */
203 HTTP_MULTIPLE_CHOICES,
204 HTTP_MOVED_PERMANENTLY,
207 HTTP_SERVICE_UNAVAILABLE,
211 static const struct {
214 } http_response[ARRAY_SIZE(http_response_type)] = {
216 #if ENABLE_FEATURE_HTTPD_RANGES
217 { "Partial Content", NULL },
220 { "Request Timeout", "No request appeared within 60 seconds" },
221 { "Not Implemented", "The requested method is not recognized" },
222 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
223 { "Unauthorized", "" },
225 { "Not Found", "The requested URL was not found" },
226 { "Bad Request", "Unsupported method" },
228 { "Internal Server Error", "Internal Server Error" },
229 #if 0 /* not implemented */
233 { "Multiple Choices" },
234 { "Moved Permanently" },
236 { "Bad Gateway", "" },
237 { "Service Unavailable", "" },
243 int verbose; /* must be int (used by getopt32) */
244 smallint flg_deny_all;
246 unsigned rmt_ip; /* used for IP-based allow/deny rules */
248 char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */
249 const char *bind_addr_or_port;
252 const char *configFile;
253 const char *home_httpd;
254 const char *index_page;
256 const char *found_mime_type;
257 const char *found_moved_temporarily;
258 Htaccess_IP *ip_a_d; /* config allow/deny lines */
260 USE_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
261 USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
262 USE_FEATURE_HTTPD_CGI(char *referer;)
263 USE_FEATURE_HTTPD_CGI(char *user_agent;)
265 off_t file_size; /* -1 - unknown */
266 #if ENABLE_FEATURE_HTTPD_RANGES
272 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
273 Htaccess *g_auth; /* config user:password lines */
275 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
276 Htaccess *mime_a; /* config mime types */
278 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
279 Htaccess *script_i; /* config script interpreters */
281 char *iobuf; /* [IOBUF_SIZE] */
282 #define hdr_buf bb_common_bufsiz1
285 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
286 const char *http_error_page[ARRAY_SIZE(http_response_type)];
288 #if ENABLE_FEATURE_HTTPD_PROXY
289 Htaccess_Proxy *proxy;
292 #define G (*ptr_to_globals)
293 #define verbose (G.verbose )
294 #define flg_deny_all (G.flg_deny_all )
295 #define rmt_ip (G.rmt_ip )
296 #define bind_addr_or_port (G.bind_addr_or_port)
297 #define g_query (G.g_query )
298 #define configFile (G.configFile )
299 #define home_httpd (G.home_httpd )
300 #define index_page (G.index_page )
301 #define found_mime_type (G.found_mime_type )
302 #define found_moved_temporarily (G.found_moved_temporarily)
303 #define last_mod (G.last_mod )
304 #define ip_a_d (G.ip_a_d )
305 #define g_realm (G.g_realm )
306 #define remoteuser (G.remoteuser )
307 #define referer (G.referer )
308 #define user_agent (G.user_agent )
309 #define file_size (G.file_size )
310 #if ENABLE_FEATURE_HTTPD_RANGES
311 #define range_start (G.range_start )
312 #define range_end (G.range_end )
313 #define range_len (G.range_len )
315 #define rmt_ip_str (G.rmt_ip_str )
316 #define g_auth (G.g_auth )
317 #define mime_a (G.mime_a )
318 #define script_i (G.script_i )
319 #define iobuf (G.iobuf )
320 #define hdr_ptr (G.hdr_ptr )
321 #define hdr_cnt (G.hdr_cnt )
322 #define http_error_page (G.http_error_page )
323 #define proxy (G.proxy )
324 #define INIT_G() do { \
325 PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
326 USE_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
327 bind_addr_or_port = "80"; \
331 #if !ENABLE_FEATURE_HTTPD_RANGES
334 range_end = MAXINT(off_t) - 1,
335 range_len = MAXINT(off_t),
340 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
343 static void send_file_and_exit(const char *url, int headers) ATTRIBUTE_NORETURN;
345 static void free_llist(has_next_ptr **pptr)
347 has_next_ptr *cur = *pptr;
349 has_next_ptr *t = cur;
356 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
357 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
358 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
359 static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
361 free_llist((has_next_ptr**)pptr);
365 static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
367 free_llist((has_next_ptr**)pptr);
370 /* Returns presumed mask width in bits or < 0 on error.
371 * Updates strp, stores IP at provided pointer */
372 static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
374 const char *p = *strp;
382 for (j = 0; j < 4; j++) {
385 if ((*p < '0' || *p > '9') && *p != '/' && *p)
388 while (*p >= '0' && *p <= '9') {
399 ip = (ip << 8) | octet;
413 /* Returns 0 on success. Stores IP and mask at provided pointers */
414 static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
420 i = scan_ip(&str, ipp, '/');
425 /* there is /xxx after dotted-IP address */
426 i = bb_strtou(str, &p, 10);
428 /* 'xxx' itself is dotted-IP mask, parse it */
429 /* (return 0 (success) only if it has N.N.N.N form) */
430 return scan_ip(&str, maskp, '\0') - 32;
439 if (sizeof(unsigned) == 4 && i == 32) {
440 /* mask >>= 32 below may not work */
446 /* i == 0 -> *maskp = 0x00000000
447 * i == 1 -> *maskp = 0x80000000
448 * i == 4 -> *maskp = 0xf0000000
449 * i == 31 -> *maskp = 0xfffffffe
450 * i == 32 -> *maskp = 0xffffffff */
451 *maskp = (uint32_t)(~mask);
456 * Parse configuration file into in-memory linked list.
458 * The first non-white character is examined to determine if the config line
459 * is one of the following:
460 * .ext:mime/type # new mime type not compiled into httpd
461 * [adAD]:from # ip address allow/deny, * for wildcard
462 * /path:user:pass # username/password
463 * Ennn:error.html # error page for status nnn
464 * P:/url:[http://]hostname[:port]/new/path # reverse proxy
466 * Any previous IP rules are discarded.
467 * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
468 * are also discarded. That is, previous settings are retained if flag is
470 * Error pages are only parsed on the main config file.
472 * path Path where to look for httpd.conf (without filename).
473 * flag Type of the parse request.
476 #define FIRST_PARSE 0
477 #define SUBDIR_PARSE 1
478 #define SIGNALED_PARSE 2
479 #define FIND_FROM_HTTPD_ROOT 3
480 static void parse_conf(const char *path, int flag)
483 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
486 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
487 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
488 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
491 const char *cf = configFile;
497 /* discard old rules */
498 free_Htaccess_IP_list(&ip_a_d);
500 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
501 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
502 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
503 /* retain previous auth and mime config only for subdir parse */
504 if (flag != SUBDIR_PARSE) {
505 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
506 free_Htaccess_list(&g_auth);
508 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
509 free_Htaccess_list(&mime_a);
511 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
512 free_Htaccess_list(&script_i);
517 if (flag == SUBDIR_PARSE || cf == NULL) {
518 cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
519 sprintf((char *)cf, "%s/%s", path, httpd_conf);
522 while ((f = fopen(cf, "r")) == NULL) {
523 if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
524 /* config file not found, no changes to config */
527 if (configFile && flag == FIRST_PARSE) /* if -c option given */
528 bb_simple_perror_msg_and_die(cf);
529 flag = FIND_FROM_HTTPD_ROOT;
533 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
536 /* This could stand some work */
537 while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
539 for (p = p0; *p0 != '\0' && *p0 != '#'; p0++) {
542 if (*p0 == ':' && c == NULL)
548 /* test for empty or strange line */
549 if (c == NULL || *c == '\0')
556 /* memorize deny all */
559 /* skip default other "word:*" config lines */
565 if (*p0 == 'A' || *p0 == 'D') {
566 /* storing current config IP line */
567 pip = xzalloc(sizeof(Htaccess_IP));
569 if (scan_ip_mask(c, &(pip->ip), &(pip->mask))) {
570 /* syntax IP{/mask} error detected, protect all */
574 pip->allow_deny = *p0;
576 /* Deny:from_IP move top */
580 /* add to bottom A:form_IP config line */
581 Htaccess_IP *prev_IP = ip_a_d;
583 if (prev_IP == NULL) {
586 while (prev_IP->next)
587 prev_IP = prev_IP->next;
595 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
596 if (flag == FIRST_PARSE && *p0 == 'E') {
598 /* error status code */
599 int status = atoi(++p0);
600 /* c already points at the character following ':' in parse loop */
601 /* c = strchr(p0, ':'); c++; */
602 if (status < HTTP_CONTINUE) {
603 bb_error_msg("config error '%s' in '%s'", buf, cf);
607 /* then error page; find matching status */
608 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
609 if (http_response_type[i] == status) {
610 http_error_page[i] = concat_path_file((*c == '/') ? NULL : home_httpd, c);
618 #if ENABLE_FEATURE_HTTPD_PROXY
619 if (flag == FIRST_PARSE && *p0 == 'P') {
620 /* P:/url:[http://]hostname[:port]/new/path */
621 char *url_from, *host_port, *url_to;
622 Htaccess_Proxy *proxy_entry;
625 host_port = strchr(c, ':');
626 if (host_port == NULL) {
627 bb_error_msg("config error '%s' in '%s'", buf, cf);
631 if (strncmp(host_port, "http://", 7) == 0)
633 if (*host_port == '\0') {
634 bb_error_msg("config error '%s' in '%s'", buf, cf);
637 url_to = strchr(host_port, '/');
638 if (url_to == NULL) {
639 bb_error_msg("config error '%s' in '%s'", buf, cf);
643 proxy_entry = xzalloc(sizeof(Htaccess_Proxy));
644 proxy_entry->url_from = xstrdup(url_from);
645 proxy_entry->host_port = xstrdup(host_port);
647 proxy_entry->url_to = xstrdup(url_to);
648 proxy_entry->next = proxy;
654 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
656 /* make full path from httpd root / current_path / config_line_path */
657 cf = (flag == SUBDIR_PARSE ? path : "");
658 p0 = xmalloc(strlen(cf) + (c - buf) + 2 + strlen(c));
660 sprintf(p0, "/%s%s", cf, buf);
662 /* another call bb_simplify_path */
667 if (*cf == '/') { /* skip duplicate (or initial) slash */
671 if (cf[1] == '/' || cf[1] == '\0') { /* remove extra '.' */
674 if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == '\0')) {
677 while (*--p != '/') /* omit previous dir */;
686 if ((p == p0) || (*p != '/')) { /* not a trailing slash */
687 ++p; /* so keep last character */
695 index_page = xstrdup(c);
699 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
700 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
701 || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
702 /* storing current config line */
703 cur = xzalloc(sizeof(Htaccess) + strlen(p0));
704 cf = strcpy(cur->before_colon, p0);
705 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
711 cur->after_colon = c;
712 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
714 /* config .mime line move top for overwrite previous */
720 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
721 if (*cf == '*' && cf[1] == '.') {
722 /* config script interpreter line move top for overwrite previous */
723 cur->next = script_i;
728 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
733 /* sort path, if current length eq or bigger then move up */
734 Htaccess *prev_hti = g_auth;
735 size_t l = strlen(cf);
738 for (hti = prev_hti; hti; hti = hti->next) {
739 if (l >= strlen(hti->before_colon)) {
740 /* insert before hti */
742 if (prev_hti != hti) {
743 prev_hti->next = cur;
751 prev_hti = prev_hti->next;
753 if (!hti) { /* not inserted, add to bottom */
758 #endif /* BASIC_AUTH */
759 #endif /* BASIC_AUTH || MIME_TYPES || SCRIPT_INTERPR */
760 } /* while (fgets) */
764 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
766 * Given a string, html-encode special characters.
767 * This is used for the -e command line option to provide an easy way
768 * for scripts to encode result data without confusing browsers. The
769 * returned string pointer is memory allocated by malloc().
771 * Returns a pointer to the encoded string (malloced).
773 static char *encodeString(const char *string)
775 /* take the simple route and encode everything */
776 /* could possibly scan once to get length. */
777 int len = strlen(string);
778 char *out = xmalloc(len * 6 + 1);
782 while ((ch = *string++)) {
783 /* very simple check for what to encode */
787 p += sprintf(p, "&#%d;", (unsigned char) ch);
792 #endif /* FEATURE_HTTPD_ENCODE_URL_STR */
795 * Given a URL encoded string, convert it to plain ascii.
796 * Since decoding always makes strings smaller, the decode is done in-place.
797 * Thus, callers should strdup() the argument if they do not want the
798 * argument modified. The return is the original pointer, allowing this
799 * function to be easily used as arguments to other functions.
801 * string The first string to decode.
802 * option_d 1 if called for httpd -d
804 * Returns a pointer to the decoded string (same as input).
806 static unsigned hex_to_bin(unsigned char c)
813 /* c | 0x20: letters to lower case, non-letters
814 * to (potentially different) non-letters */
815 v = (unsigned)(c | 0x20) - 'a';
821 void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
822 int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
823 t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
825 static char *decodeString(char *orig, int option_d)
827 /* note that decoded string is always shorter than original */
832 while ((c = *ptr++) != '\0') {
835 if (option_d && c == '+') {
843 v = hex_to_bin(ptr[0]);
851 v = (v * 16) | hex_to_bin(ptr[1]);
854 if (!option_d && (v == '/' || v == '\0')) {
855 /* caller takes it as indication of invalid
856 * (dangerous wrt exploits) chars */
866 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
868 * Decode a base64 data stream as per rfc1521.
869 * Note that the rfc states that non base64 chars are to be ignored.
870 * Since the decode always results in a shorter size than the input,
871 * it is OK to pass the input arg as an output arg.
872 * Parameter: a pointer to a base64 encoded string.
873 * Decoded data is stored in-place.
875 static void decodeBase64(char *Data)
877 const unsigned char *in = (const unsigned char *)Data;
878 /* The decoded size will be at most 3/4 the size of the encoded */
885 if (t >= '0' && t <= '9')
887 else if (t >= 'A' && t <= 'Z')
889 else if (t >= 'a' && t <= 'z')
903 *Data++ = (char) (ch >> 16);
904 *Data++ = (char) (ch >> 8);
914 * Create a listen server socket on the designated port.
916 static int openServer(void)
918 unsigned n = bb_strtou(bind_addr_or_port, NULL, 10);
919 if (!errno && n && n <= 0xffff)
920 n = create_and_bind_stream_or_die(NULL, n);
922 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
928 * Log the connection closure and exit.
930 static void log_and_exit(void) ATTRIBUTE_NORETURN;
931 static void log_and_exit(void)
933 /* Paranoia. IE said to be buggy. It may send some extra data
934 * or be confused by us just exiting without SHUT_WR. Oh well. */
935 shutdown(1, SHUT_WR);
937 while (read(0, iobuf, IOBUF_SIZE) > 0)
941 bb_error_msg("closed");
942 _exit(xfunc_error_retval);
946 * Create and send HTTP response headers.
947 * The arguments are combined and sent as one write operation. Note that
948 * IE will puke big-time if the headers are not sent in one packet and the
949 * second packet is delayed for any reason.
950 * responseNum - the result code to send.
952 static void send_headers(int responseNum)
954 static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
956 const char *responseString = "";
957 const char *infoString = NULL;
958 const char *mime_type;
959 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
960 const char *error_page = 0;
963 time_t timer = time(0);
967 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
968 if (http_response_type[i] == responseNum) {
969 responseString = http_response[i].name;
970 infoString = http_response[i].info;
971 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
972 error_page = http_error_page[i];
977 /* error message is HTML */
978 mime_type = responseNum == HTTP_OK ?
979 found_mime_type : "text/html";
982 bb_error_msg("response:%u", responseNum);
984 /* emit the current date */
985 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
987 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
988 "Date: %s\r\nConnection: close\r\n",
989 responseNum, responseString, mime_type, tmp_str);
991 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
992 if (responseNum == HTTP_UNAUTHORIZED) {
993 len += sprintf(iobuf + len,
994 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
998 if (responseNum == HTTP_MOVED_TEMPORARILY) {
999 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
1000 found_moved_temporarily,
1001 (g_query ? "?" : ""),
1002 (g_query ? g_query : ""));
1005 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
1006 if (error_page && !access(error_page, R_OK)) {
1007 strcat(iobuf, "\r\n");
1011 fprintf(stderr, "headers: '%s'\n", iobuf);
1012 full_write(1, iobuf, len);
1014 fprintf(stderr, "writing error page: '%s'\n", error_page);
1015 return send_file_and_exit(error_page, FALSE);
1019 if (file_size != -1) { /* file */
1020 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
1021 #if ENABLE_FEATURE_HTTPD_RANGES
1022 if (responseNum == HTTP_PARTIAL_CONTENT) {
1023 len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n",
1027 file_size = range_end - range_start + 1;
1030 len += sprintf(iobuf + len,
1031 #if ENABLE_FEATURE_HTTPD_RANGES
1032 "Accept-Ranges: bytes\r\n"
1034 "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
1040 iobuf[len++] = '\r';
1041 iobuf[len++] = '\n';
1043 len += sprintf(iobuf + len,
1044 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
1045 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
1046 responseNum, responseString,
1047 responseNum, responseString, infoString);
1050 fprintf(stderr, "headers: '%s'\n", iobuf);
1051 if (full_write(1, iobuf, len) != len) {
1053 bb_perror_msg("error");
1058 static void send_headers_and_exit(int responseNum) ATTRIBUTE_NORETURN;
1059 static void send_headers_and_exit(int responseNum)
1061 send_headers(responseNum);
1066 * Read from the socket until '\n' or EOF. '\r' chars are removed.
1067 * '\n' is replaced with NUL.
1068 * Return number of characters read or 0 if nothing is read
1069 * ('\r' and '\n' are not counted).
1070 * Data is returned in iobuf.
1072 static int get_line(void)
1079 hdr_cnt = safe_read(0, hdr_buf, sizeof(hdr_buf));
1084 iobuf[count] = c = *hdr_ptr++;
1090 iobuf[count] = '\0';
1093 if (count < (IOBUF_SIZE - 1)) /* check overflow */
1099 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1101 /* gcc 4.2.1 fares better with NOINLINE */
1102 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) ATTRIBUTE_NORETURN;
1103 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1105 enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1106 struct pollfd pfd[3];
1107 int out_cnt; /* we buffer a bit of initial CGI output */
1110 /* iobuf is used for CGI -> network data,
1111 * hdr_buf is for network -> CGI data (POSTDATA) */
1113 /* If CGI dies, we still want to correctly finish reading its output
1114 * and send it to the peer. So please no SIGPIPEs! */
1115 signal(SIGPIPE, SIG_IGN);
1117 // We inconsistently handle a case when more POSTDATA from network
1118 // is coming than we expected. We may give *some part* of that
1119 // extra data to CGI.
1121 //if (hdr_cnt > post_len) {
1122 // /* We got more POSTDATA from network than we expected */
1123 // hdr_cnt = post_len;
1125 post_len -= hdr_cnt;
1126 /* post_len - number of POST bytes not yet read from network */
1128 /* NB: breaking out of this loop jumps to log_and_exit() */
1131 memset(pfd, 0, sizeof(pfd));
1133 pfd[FROM_CGI].fd = fromCgi_rd;
1134 pfd[FROM_CGI].events = POLLIN;
1137 pfd[TO_CGI].fd = toCgi_wr;
1139 pfd[TO_CGI].events = POLLOUT;
1140 } else if (post_len > 0) {
1141 pfd[0].events = POLLIN;
1143 /* post_len <= 0 && hdr_cnt <= 0:
1144 * no more POST data to CGI,
1145 * let CGI see EOF on CGI's stdin */
1151 /* Now wait on the set of sockets */
1152 count = safe_poll(pfd, 3, -1);
1155 if (safe_waitpid(pid, &status, WNOHANG) <= 0) {
1156 /* Weird. CGI didn't exit and no fd's
1157 * are ready, yet poll returned?! */
1160 if (DEBUG && WIFEXITED(status))
1161 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1162 if (DEBUG && WIFSIGNALED(status))
1163 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1168 if (pfd[TO_CGI].revents) {
1169 /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */
1170 /* Have data from peer and can write to CGI */
1171 count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1172 /* Doesn't happen, we dont use nonblocking IO here
1173 *if (count < 0 && errno == EAGAIN) {
1180 /* EOF/broken pipe to CGI, stop piping POST data */
1181 hdr_cnt = post_len = 0;
1185 if (pfd[0].revents) {
1186 /* post_len > 0 && hdr_cnt == 0 here */
1187 /* We expect data, prev data portion is eaten by CGI
1188 * and there *is* data to read from the peer
1190 //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
1191 //count = safe_read(0, hdr_buf, count);
1192 count = safe_read(0, hdr_buf, sizeof(hdr_buf));
1198 /* no more POST data can be read */
1203 if (pfd[FROM_CGI].revents) {
1204 /* There is something to read from CGI */
1207 /* Are we still buffering CGI output? */
1209 /* HTTP_200[] has single "\r\n" at the end.
1210 * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1211 * CGI scripts MUST send their own header terminated by
1212 * empty line, then data. That's why we have only one
1213 * <cr><lf> pair here. We will output "200 OK" line
1214 * if needed, but CGI still has to provide blank line
1215 * between header and body */
1217 /* Must use safe_read, not full_read, because
1218 * CGI may output a few first bytes and then wait
1219 * for POSTDATA without closing stdout.
1220 * With full_read we may wait here forever. */
1221 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1223 /* eof (or error) and there was no "HTTP",
1224 * so write it, then write received data */
1226 full_write(1, HTTP_200, sizeof(HTTP_200)-1);
1227 full_write(1, rbuf, out_cnt);
1229 break; /* CGI stdout is closed, exiting */
1233 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1234 if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1235 /* send "HTTP/1.0 " */
1236 if (full_write(1, HTTP_200, 9) != 9)
1238 rbuf += 8; /* skip "Status: " */
1239 count = out_cnt - 8;
1240 out_cnt = -1; /* buffering off */
1241 } else if (out_cnt >= 4) {
1242 /* Did CGI add "HTTP"? */
1243 if (memcmp(rbuf, HTTP_200, 4) != 0) {
1244 /* there is no "HTTP", do it ourself */
1245 if (full_write(1, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1249 if (!strstr(rbuf, "ontent-")) {
1250 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1252 * Counter-example of valid CGI without Content-type:
1253 * echo -en "HTTP/1.0 302 Found\r\n"
1254 * echo -en "Location: http://www.busybox.net\r\n"
1258 out_cnt = -1; /* buffering off */
1261 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1263 break; /* eof (or error) */
1265 if (full_write(1, rbuf, count) != count)
1268 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1269 } /* if (pfd[FROM_CGI].revents) */
1275 #if ENABLE_FEATURE_HTTPD_CGI
1277 static void setenv1(const char *name, const char *value)
1279 setenv(name, value ? value : "", 1);
1283 * Spawn CGI script, forward CGI's stdin/out <=> network
1285 * Environment variables are set up and the script is invoked with pipes
1286 * for stdin/stdout. If a POST is being done the script is fed the POST
1287 * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1290 * const char *url The requested URL (with leading /).
1291 * int post_len Length of the POST body.
1292 * const char *cookie For set HTTP_COOKIE.
1293 * const char *content_type For set CONTENT_TYPE.
1295 static void send_cgi_and_exit(
1297 const char *request,
1300 const char *content_type) ATTRIBUTE_NORETURN;
1301 static void send_cgi_and_exit(
1303 const char *request,
1306 const char *content_type)
1308 struct { int rd; int wr; } fromCgi; /* CGI -> httpd pipe */
1309 struct { int rd; int wr; } toCgi; /* httpd -> CGI pipe */
1316 * We are mucking with environment _first_ and then vfork/exec,
1317 * this allows us to use vfork safely. Parent don't care about
1318 * these environment changes anyway.
1324 purl = xstrdup(url);
1326 while ((script = strchr(script + 1, '/')) != NULL) {
1327 /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
1331 if (!is_directory(purl + 1, 1, &sb)) {
1332 /* not directory, found script.cgi/PATH_INFO */
1336 *script = '/'; /* is directory, find next '/' */
1338 setenv1("PATH_INFO", script); /* set /PATH_INFO or "" */
1339 setenv1("REQUEST_METHOD", request);
1341 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", purl, g_query));
1343 setenv1("REQUEST_URI", purl);
1346 *script = '\0'; /* cut off /PATH_INFO */
1348 /* SCRIPT_FILENAME required by PHP in CGI mode */
1349 fullpath = concat_path_file(home_httpd, purl);
1350 setenv1("SCRIPT_FILENAME", fullpath);
1351 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1352 setenv1("SCRIPT_NAME", purl);
1353 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1354 * QUERY_STRING: The information which follows the ? in the URL
1355 * which referenced this script. This is the query information.
1356 * It should not be decoded in any fashion. This variable
1357 * should always be set when there is query information,
1358 * regardless of command line decoding. */
1359 /* (Older versions of bbox seem to do some decoding) */
1360 setenv1("QUERY_STRING", g_query);
1361 putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1362 putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1363 putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1364 /* Having _separate_ variables for IP and port defeats
1365 * the purpose of having socket abstraction. Which "port"
1366 * are you using on Unix domain socket?
1367 * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1370 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1371 char *cp = strrchr(p, ':');
1372 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1374 if (cp) *cp = '\0'; /* delete :PORT */
1375 setenv1("REMOTE_ADDR", p);
1378 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1379 setenv1("REMOTE_PORT", cp + 1);
1383 setenv1("HTTP_USER_AGENT", user_agent);
1385 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1387 setenv1("HTTP_COOKIE", cookie);
1389 setenv1("CONTENT_TYPE", content_type);
1390 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1392 setenv1("REMOTE_USER", remoteuser);
1393 putenv((char*)"AUTH_TYPE=Basic");
1397 setenv1("HTTP_REFERER", referer);
1404 /* TODO: log perror? */
1410 xfunc_error_retval = 242;
1412 xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */
1413 xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */
1416 /* User seeing stderr output can be a security problem.
1417 * If CGI really wants that, it can always do dup itself. */
1420 script = strrchr(fullpath, '/');
1421 //fullpath is a result of concat_path_file and always has '/'
1423 // goto error_execing_cgi;
1425 /* chdiring to script's dir */
1426 if (chdir(script == fullpath ? "/" : fullpath) == 0) {
1429 *script++ = '/'; /* repair fullpath */
1430 /* set argv[0] to name without path */
1434 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1436 char *suffix = strrchr(script, '.');
1440 for (cur = script_i; cur; cur = cur->next) {
1441 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1442 /* found interpreter name */
1443 fullpath = cur->after_colon;
1444 argv[0] = cur->after_colon;
1453 execv(fullpath, argv);
1455 bb_perror_msg("exec %s", fullpath);
1456 } else if (verbose) {
1457 bb_perror_msg("chdir %s", fullpath);
1459 //error_execing_cgi:
1461 * (we are CGI here, our stdout is pumped to the net) */
1462 send_headers_and_exit(HTTP_NOT_FOUND);
1465 /* Parent process */
1467 /* Restore variables possibly changed by child */
1468 xfunc_error_retval = 0;
1473 cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1476 #endif /* FEATURE_HTTPD_CGI */
1479 * Send a file response to a HTTP request, and exit
1482 * const char *url The requested URL (with leading /).
1483 * headers Don't send headers before if FALSE.
1485 static void send_file_and_exit(const char *url, int headers)
1487 static const char *const suffixTable[] = {
1488 /* Warning: shorter equivalent suffix in one line must be first */
1489 ".htm.html", "text/html",
1490 ".jpg.jpeg", "image/jpeg",
1491 ".gif", "image/gif",
1492 ".png", "image/png",
1493 ".txt.h.c.cc.cpp", "text/plain",
1495 ".wav", "audio/wav",
1496 ".avi", "video/x-msvideo",
1497 ".qt.mov", "video/quicktime",
1498 ".mpe.mpeg", "video/mpeg",
1499 ".mid.midi", "audio/midi",
1500 ".mp3", "audio/mpeg",
1501 #if 0 /* unpopular */
1502 ".au", "audio/basic",
1503 ".pac", "application/x-ns-proxy-autoconfig",
1504 ".vrml.wrl", "model/vrml",
1511 const char *const *table;
1512 const char *try_suffix;
1514 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1518 suffix = strrchr(url, '.');
1520 /* If not found, set default as "application/octet-stream"; */
1521 found_mime_type = "application/octet-stream";
1523 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1526 for (table = suffixTable; *table; table += 2) {
1527 try_suffix = strstr(table[0], suffix);
1529 try_suffix += strlen(suffix);
1530 if (*try_suffix == '\0' || *try_suffix == '.') {
1531 found_mime_type = table[1];
1536 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1537 for (cur = mime_a; cur; cur = cur->next) {
1538 if (strcmp(cur->before_colon, suffix) == 0) {
1539 found_mime_type = cur->after_colon;
1547 bb_error_msg("sending file '%s' content-type: %s",
1548 url, found_mime_type);
1550 f = open(url, O_RDONLY);
1553 bb_perror_msg("cannot open '%s'", url);
1555 send_headers_and_exit(HTTP_NOT_FOUND);
1557 #if ENABLE_FEATURE_HTTPD_RANGES
1559 range_start = 0; /* err pages and ranges don't mix */
1560 range_len = MAXINT(off_t);
1563 range_end = file_size - 1;
1565 if (range_end < range_start
1566 || lseek(f, range_start, SEEK_SET) != range_start
1568 lseek(f, 0, SEEK_SET);
1571 range_len = range_end - range_start + 1;
1572 send_headers(HTTP_PARTIAL_CONTENT);
1579 send_headers(HTTP_OK);
1581 /* If you want to know about EPIPE below
1582 * (happens if you abort downloads from local httpd): */
1583 signal(SIGPIPE, SIG_IGN);
1585 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1586 offset = range_start;
1588 /* sz is rounded down to 64k */
1589 ssize_t sz = MAXINT(ssize_t) - 0xffff;
1590 USE_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1591 count = sendfile(1, f, &offset, sz);
1593 if (offset == range_start)
1597 USE_FEATURE_HTTPD_RANGES(range_len -= sz;)
1598 } while (count > 0 && range_len);
1603 while ((count = safe_read(f, iobuf, IOBUF_SIZE)) > 0) {
1605 USE_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1606 n = full_write(1, iobuf, count);
1609 USE_FEATURE_HTTPD_RANGES(range_len -= count;)
1613 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1616 if (count < 0 && verbose > 1)
1617 bb_perror_msg("error");
1621 static int checkPermIP(void)
1625 /* This could stand some work */
1626 for (cur = ip_a_d; cur; cur = cur->next) {
1629 "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1631 (unsigned char)(cur->ip >> 24),
1632 (unsigned char)(cur->ip >> 16),
1633 (unsigned char)(cur->ip >> 8),
1634 (unsigned char)(cur->ip),
1635 (unsigned char)(cur->mask >> 24),
1636 (unsigned char)(cur->mask >> 16),
1637 (unsigned char)(cur->mask >> 8),
1638 (unsigned char)(cur->mask)
1641 if ((rmt_ip & cur->mask) == cur->ip)
1642 return cur->allow_deny == 'A'; /* Allow/Deny */
1645 /* if unconfigured, return 1 - access from all */
1646 return !flg_deny_all;
1649 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1651 * Check the permission file for access password protected.
1653 * If config file isn't present, everything is allowed.
1654 * Entries are of the form you can see example from header source
1656 * path The file path.
1657 * request User information to validate.
1659 * Returns 1 if request is OK.
1661 static int checkPerm(const char *path, const char *request)
1667 const char *prev = NULL;
1669 /* This could stand some work */
1670 for (cur = g_auth; cur; cur = cur->next) {
1673 p0 = cur->before_colon;
1674 if (prev != NULL && strcmp(prev, p0) != 0)
1675 continue; /* find next identical */
1676 p = cur->after_colon;
1678 fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
1681 if (strncmp(p0, path, l) == 0
1682 && (l == 1 || path[l] == '/' || path[l] == '\0')
1685 /* path match found. Check request */
1686 /* for check next /path:user:password */
1688 u = strchr(request, ':');
1690 /* bad request, ':' required */
1694 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1698 if (strncmp(p, request, u - request) != 0) {
1699 /* user doesn't match */
1702 pp = strchr(p, ':');
1703 if (pp && pp[1] == '$' && pp[2] == '1'
1704 && pp[3] == '$' && pp[4]
1707 cipher = pw_encrypt(u+1, pp);
1708 if (strcmp(cipher, pp) == 0)
1709 goto set_remoteuser_var; /* Ok */
1715 if (strcmp(p, request) == 0) {
1717 remoteuser = strdup(request);
1719 remoteuser[u - request] = '\0';
1726 return prev == NULL;
1728 #endif /* FEATURE_HTTPD_BASIC_AUTH */
1730 #if ENABLE_FEATURE_HTTPD_PROXY
1731 static Htaccess_Proxy *find_proxy_entry(const char *url)
1734 for (p = proxy; p; p = p->next) {
1735 if (strncmp(url, p->url_from, strlen(p->url_from)) == 0)
1745 static void exit_on_signal(int sig) ATTRIBUTE_NORETURN;
1746 static void exit_on_signal(int sig)
1748 send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1752 * Handle an incoming http request and exit.
1754 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) ATTRIBUTE_NORETURN;
1755 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1757 static const char request_GET[] ALIGN1 = "GET";
1764 #if ENABLE_FEATURE_HTTPD_CGI
1765 const char *prequest;
1766 char *cookie = NULL;
1767 char *content_type = NULL;
1768 unsigned long length = 0;
1769 #elif ENABLE_FEATURE_HTTPD_PROXY
1770 #define prequest request_GET
1771 unsigned long length = 0;
1773 char http_major_version;
1774 #if ENABLE_FEATURE_HTTPD_PROXY
1775 char http_minor_version;
1776 char *header_buf = header_buf; /* for gcc */
1777 char *header_ptr = header_ptr;
1778 Htaccess_Proxy *proxy_entry;
1780 struct sigaction sa;
1781 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1782 int credentials = -1; /* if not required this is Ok */
1785 /* Allocation of iobuf is postponed until now
1786 * (IOW, server process doesn't need to waste 8k) */
1787 iobuf = xmalloc(IOBUF_SIZE);
1790 if (fromAddr->u.sa.sa_family == AF_INET) {
1791 rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr);
1793 #if ENABLE_FEATURE_IPV6
1794 if (fromAddr->u.sa.sa_family == AF_INET6
1795 && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0
1796 && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0
1797 && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1798 rmt_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]);
1800 if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1801 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa);
1804 /* this trick makes -v logging much simpler */
1805 applet_name = rmt_ip_str;
1807 bb_error_msg("connected");
1810 /* Install timeout handler */
1811 memset(&sa, 0, sizeof(sa));
1812 sa.sa_handler = exit_on_signal;
1813 /* sigemptyset(&sa.sa_mask); - memset should be enough */
1814 /*sa.sa_flags = 0; - no SA_RESTART */
1815 sigaction(SIGALRM, &sa, NULL);
1816 alarm(HEADER_READ_TIMEOUT);
1818 if (!get_line()) /* EOF or error or empty line */
1819 send_headers_and_exit(HTTP_BAD_REQUEST);
1821 /* Determine type of request (GET/POST) */
1822 urlp = strpbrk(iobuf, " \t");
1824 send_headers_and_exit(HTTP_BAD_REQUEST);
1826 #if ENABLE_FEATURE_HTTPD_CGI
1827 prequest = request_GET;
1828 if (strcasecmp(iobuf, prequest) != 0) {
1830 if (strcasecmp(iobuf, prequest) != 0)
1831 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1834 if (strcasecmp(iobuf, request_GET) != 0)
1835 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1837 urlp = skip_whitespace(urlp);
1839 send_headers_and_exit(HTTP_BAD_REQUEST);
1841 /* Find end of URL and parse HTTP version, if any */
1842 http_major_version = '0';
1843 USE_FEATURE_HTTPD_PROXY(http_minor_version = '0';)
1844 tptr = strchrnul(urlp, ' ');
1845 /* Is it " HTTP/"? */
1846 if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) {
1847 http_major_version = tptr[6];
1848 USE_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];)
1852 /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
1853 urlcopy = alloca((tptr - urlp) + 2 + strlen(index_page));
1854 /*if (urlcopy == NULL)
1855 * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
1856 strcpy(urlcopy, urlp);
1857 /* NB: urlcopy ptr is never changed after this */
1859 /* Extract url args if present */
1861 tptr = strchr(urlcopy, '?');
1867 /* Decode URL escape sequences */
1868 tptr = decodeString(urlcopy, 0);
1870 send_headers_and_exit(HTTP_BAD_REQUEST);
1871 if (tptr == urlcopy + 1) {
1872 /* '/' or NUL is encoded */
1873 send_headers_and_exit(HTTP_NOT_FOUND);
1876 /* Canonicalize path */
1877 /* Algorithm stolen from libbb bb_simplify_path(),
1878 * but don't strdup and reducing trailing slash and protect out root */
1879 urlp = tptr = urlcopy;
1882 /* skip duplicate (or initial) slash */
1887 /* skip extra '.' */
1888 if (tptr[1] == '/' || !tptr[1]) {
1891 /* '..': be careful */
1892 if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
1894 if (urlp == urlcopy) /* protect root */
1895 send_headers_and_exit(HTTP_BAD_REQUEST);
1896 while (*--urlp != '/') /* omit previous dir */;
1903 *++urlp = '\0'; /* so keep last character */
1904 tptr = urlp; /* end ptr */
1906 /* If URL is a directory, add '/' */
1907 if (tptr[-1] != '/') {
1908 if (is_directory(urlcopy + 1, 1, &sb)) {
1909 found_moved_temporarily = urlcopy;
1915 bb_error_msg("url:%s", urlcopy);
1918 ip_allowed = checkPermIP();
1919 while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
1920 /* have path1/path2 */
1922 if (is_directory(urlcopy + 1, 1, &sb)) {
1923 /* may be having subdir config */
1924 parse_conf(urlcopy + 1, SUBDIR_PARSE);
1925 ip_allowed = checkPermIP();
1930 #if ENABLE_FEATURE_HTTPD_PROXY
1931 proxy_entry = find_proxy_entry(urlcopy);
1933 header_buf = header_ptr = xmalloc(IOBUF_SIZE);
1936 if (http_major_version >= '0') {
1937 /* Request was with "... HTTP/nXXX", and n >= 0 */
1939 /* Read until blank line for HTTP version specified, else parse immediate */
1941 alarm(HEADER_READ_TIMEOUT);
1943 break; /* EOF or error or empty line */
1945 bb_error_msg("header: '%s'", iobuf);
1947 #if ENABLE_FEATURE_HTTPD_PROXY
1948 /* We need 2 more bytes for yet another "\r\n" -
1949 * see near fdprintf(proxy_fd...) further below */
1950 if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) {
1951 int len = strlen(iobuf);
1952 if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4)
1953 len = IOBUF_SIZE - (header_ptr - header_buf) - 4;
1954 memcpy(header_ptr, iobuf, len);
1956 header_ptr[0] = '\r';
1957 header_ptr[1] = '\n';
1962 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1963 /* Try and do our best to parse more lines */
1964 if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
1965 /* extra read only for POST */
1966 if (prequest != request_GET) {
1967 tptr = iobuf + sizeof("Content-length:") - 1;
1969 send_headers_and_exit(HTTP_BAD_REQUEST);
1971 /* not using strtoul: it ignores leading minus! */
1972 length = strtol(tptr, &tptr, 10);
1973 /* length is "ulong", but we need to pass it to int later */
1974 /* so we check for negative or too large values in one go: */
1975 /* (long -> ulong conv caused negatives to be seen as > INT_MAX) */
1976 if (tptr[0] || errno || length > INT_MAX)
1977 send_headers_and_exit(HTTP_BAD_REQUEST);
1981 #if ENABLE_FEATURE_HTTPD_CGI
1982 else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
1983 cookie = strdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
1984 } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
1985 content_type = strdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
1986 } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
1987 referer = strdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
1988 } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
1989 user_agent = strdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
1992 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1993 if (STRNCASECMP(iobuf, "Authorization:") == 0) {
1994 /* We only allow Basic credentials.
1995 * It shows up as "Authorization: Basic <userid:password>" where
1996 * the userid:password is base64 encoded.
1998 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
1999 if (STRNCASECMP(tptr, "Basic") != 0)
2001 tptr += sizeof("Basic")-1;
2002 /* decodeBase64() skips whitespace itself */
2004 credentials = checkPerm(urlcopy, tptr);
2006 #endif /* FEATURE_HTTPD_BASIC_AUTH */
2007 #if ENABLE_FEATURE_HTTPD_RANGES
2008 if (STRNCASECMP(iobuf, "Range:") == 0) {
2009 /* We know only bytes=NNN-[MMM] */
2010 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
2011 if (strncmp(s, "bytes=", 6) == 0) {
2012 s += sizeof("bytes=")-1;
2013 range_start = BB_STRTOOFF(s, &s, 10);
2014 if (s[0] != '-' || range_start < 0) {
2017 range_end = BB_STRTOOFF(s+1, NULL, 10);
2018 if (errno || range_end < range_start)
2024 } /* while extra header reading */
2027 /* We are done reading headers, disable peer timeout */
2030 if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || ip_allowed == 0) {
2031 /* protect listing [/path]/httpd_conf or IP deny */
2032 send_headers_and_exit(HTTP_FORBIDDEN);
2035 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2036 if (credentials <= 0 && checkPerm(urlcopy, ":") == 0) {
2037 send_headers_and_exit(HTTP_UNAUTHORIZED);
2041 if (found_moved_temporarily) {
2042 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
2045 #if ENABLE_FEATURE_HTTPD_PROXY
2046 if (proxy_entry != NULL) {
2048 len_and_sockaddr *lsa;
2050 proxy_fd = socket(AF_INET, SOCK_STREAM, 0);
2052 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2053 lsa = host2sockaddr(proxy_entry->host_port, 80);
2055 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2056 if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0)
2057 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2058 fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n",
2059 prequest, /* GET or POST */
2060 proxy_entry->url_to, /* url part 1 */
2061 urlcopy + strlen(proxy_entry->url_from), /* url part 2 */
2062 (g_query ? "?" : ""), /* "?" (maybe) */
2063 (g_query ? g_query : ""), /* query string (maybe) */
2064 http_major_version, http_minor_version);
2065 header_ptr[0] = '\r';
2066 header_ptr[1] = '\n';
2068 write(proxy_fd, header_buf, header_ptr - header_buf);
2069 free(header_buf); /* on the order of 8k, free it */
2070 /* cgi_io_loop_and_exit needs to have two disctinct fds */
2071 cgi_io_loop_and_exit(proxy_fd, dup(proxy_fd), length);
2075 tptr = urlcopy + 1; /* skip first '/' */
2077 #if ENABLE_FEATURE_HTTPD_CGI
2078 if (strncmp(tptr, "cgi-bin/", 8) == 0) {
2079 if (tptr[8] == '\0') {
2080 /* protect listing "cgi-bin/" */
2081 send_headers_and_exit(HTTP_FORBIDDEN);
2083 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2085 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
2087 char *suffix = strrchr(tptr, '.');
2090 for (cur = script_i; cur; cur = cur->next) {
2091 if (strcmp(cur->before_colon + 1, suffix) == 0) {
2092 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2098 if (prequest != request_GET) {
2099 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2101 #endif /* FEATURE_HTTPD_CGI */
2103 if (urlp[-1] == '/')
2104 strcpy(urlp, index_page);
2105 if (stat(tptr, &sb) == 0) {
2106 file_size = sb.st_size;
2107 last_mod = sb.st_mtime;
2109 #if ENABLE_FEATURE_HTTPD_CGI
2110 else if (urlp[-1] == '/') {
2111 /* It's a dir URL and there is no index.html
2112 * Try cgi-bin/index.cgi */
2113 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
2116 send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
2121 * fall through to send_file, it errors out if open fails
2125 send_file_and_exit(tptr, TRUE);
2129 * The main http server function.
2130 * Given a socket, listen for new connections and farm out
2131 * the processing as a [v]forked process.
2135 static void mini_httpd(int server_socket) ATTRIBUTE_NORETURN;
2136 static void mini_httpd(int server_socket)
2138 /* NB: it's best to not use xfuncs in this loop before fork().
2139 * Otherwise server may die on transient errors (temporary
2140 * out-of-memory condition, etc), which is Bad(tm).
2141 * Try to do any dangerous calls after fork.
2145 len_and_sockaddr fromAddr;
2147 /* Wait for connections... */
2148 fromAddr.len = LSA_SIZEOF_SA;
2149 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2153 /* set the KEEPALIVE option to cull dead connections */
2154 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2158 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2159 /* Do not reload config on HUP */
2160 signal(SIGHUP, SIG_IGN);
2162 close(server_socket);
2166 handle_incoming_and_exit(&fromAddr);
2168 /* parent, or fork failed */
2174 static void mini_httpd_nommu(int server_socket, int argc, char **argv) ATTRIBUTE_NORETURN;
2175 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2177 char *argv_copy[argc + 2];
2179 argv_copy[0] = argv[0];
2180 argv_copy[1] = (char*)"-i";
2181 memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2183 /* NB: it's best to not use xfuncs in this loop before vfork().
2184 * Otherwise server may die on transient errors (temporary
2185 * out-of-memory condition, etc), which is Bad(tm).
2186 * Try to do any dangerous calls after fork.
2190 len_and_sockaddr fromAddr;
2192 /* Wait for connections... */
2193 fromAddr.len = LSA_SIZEOF_SA;
2194 n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
2198 /* set the KEEPALIVE option to cull dead connections */
2199 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2203 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2204 /* Do not reload config on HUP */
2205 signal(SIGHUP, SIG_IGN);
2207 close(server_socket);
2211 /* Run a copy of ourself in inetd mode */
2214 /* parent, or vfork failed */
2222 * Process a HTTP connection on stdin/out.
2225 static void mini_httpd_inetd(void) ATTRIBUTE_NORETURN;
2226 static void mini_httpd_inetd(void)
2228 len_and_sockaddr fromAddr;
2230 fromAddr.len = LSA_SIZEOF_SA;
2231 getpeername(0, &fromAddr.u.sa, &fromAddr.len);
2232 handle_incoming_and_exit(&fromAddr);
2235 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2236 static void sighup_handler(int sig)
2238 struct sigaction sa;
2240 parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
2242 memset(&sa, 0, sizeof(sa));
2243 sa.sa_handler = sighup_handler;
2244 /*sigemptyset(&sa.sa_mask); - memset should be enough */
2245 sa.sa_flags = SA_RESTART;
2246 sigaction(SIGHUP, &sa, NULL);
2251 c_opt_config_file = 0,
2254 USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2255 USE_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,)
2256 USE_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,)
2257 USE_FEATURE_HTTPD_SETUID( u_opt_setuid ,)
2262 OPT_CONFIG_FILE = 1 << c_opt_config_file,
2263 OPT_DECODE_URL = 1 << d_opt_decode_url,
2264 OPT_HOME_HTTPD = 1 << h_opt_home_httpd,
2265 OPT_ENCODE_URL = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2266 OPT_REALM = USE_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0,
2267 OPT_MD5 = USE_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0,
2268 OPT_SETUID = USE_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0,
2269 OPT_PORT = 1 << p_opt_port,
2270 OPT_INETD = 1 << p_opt_inetd,
2271 OPT_FOREGROUND = 1 << p_opt_foreground,
2272 OPT_VERBOSE = 1 << p_opt_verbose,
2276 int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2277 int httpd_main(int argc, char **argv)
2279 int server_socket = server_socket; /* for gcc */
2281 char *url_for_decode;
2282 USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2283 USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2284 USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2285 USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2289 #if ENABLE_LOCALE_SUPPORT
2290 /* Undo busybox.c: we want to speak English in http (dates etc) */
2291 setlocale(LC_TIME, "C");
2294 home_httpd = xrealloc_getcwd_or_warn(NULL);
2295 /* -v counts, -i implies -f */
2296 opt_complementary = "vv:if";
2297 /* We do not "absolutize" path given by -h (home) opt.
2298 * If user gives relative path in -h, $SCRIPT_FILENAME can end up
2300 opt = getopt32(argv, "c:d:h:"
2301 USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2302 USE_FEATURE_HTTPD_BASIC_AUTH("r:")
2303 USE_FEATURE_HTTPD_AUTH_MD5("m:")
2304 USE_FEATURE_HTTPD_SETUID("u:")
2306 &configFile, &url_for_decode, &home_httpd
2307 USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2308 USE_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2309 USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
2310 USE_FEATURE_HTTPD_SETUID(, &s_ugid)
2311 , &bind_addr_or_port
2314 if (opt & OPT_DECODE_URL) {
2315 fputs(decodeString(url_for_decode, 1), stdout);
2318 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2319 if (opt & OPT_ENCODE_URL) {
2320 fputs(encodeString(url_for_encode), stdout);
2324 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2325 if (opt & OPT_MD5) {
2326 puts(pw_encrypt(pass, "$1$"));
2330 #if ENABLE_FEATURE_HTTPD_SETUID
2331 if (opt & OPT_SETUID) {
2332 if (!get_uidgid(&ugid, s_ugid, 1))
2333 bb_error_msg_and_die("unrecognized user[:group] "
2334 "name '%s'", s_ugid);
2339 if (!(opt & OPT_FOREGROUND)) {
2340 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2345 if (!(opt & OPT_INETD)) {
2346 signal(SIGCHLD, SIG_IGN);
2347 server_socket = openServer();
2348 #if ENABLE_FEATURE_HTTPD_SETUID
2349 /* drop privileges */
2350 if (opt & OPT_SETUID) {
2351 if (ugid.gid != (gid_t)-1) {
2352 if (setgroups(1, &ugid.gid) == -1)
2353 bb_perror_msg_and_die("setgroups");
2361 #if 0 /*was #if ENABLE_FEATURE_HTTPD_CGI*/
2362 /* User can do it himself: 'env - PATH="$PATH" httpd'
2363 * We don't do it because we don't want to screw users
2365 * 'env - VAR1=val1 VAR2=val2 httpd'
2366 * and have VAR1 and VAR2 values visible in their CGIs.
2367 * Besides, it is also smaller. */
2369 char *p = getenv("PATH");
2370 /* env strings themself are not freed, no need to strdup(p): */
2374 // if (!(opt & OPT_INETD))
2375 // setenv_long("SERVER_PORT", ???);
2379 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2380 if (!(opt & OPT_INETD))
2382 else /* do not install HUP handler in inetd mode */
2384 index_page = "index.html";
2385 parse_conf(default_path_httpd_conf, FIRST_PARSE);
2387 xfunc_error_retval = 0;
2388 if (opt & OPT_INETD)
2391 if (!(opt & OPT_FOREGROUND))
2392 bb_daemonize(0); /* don't change current directory */
2393 mini_httpd(server_socket); /* never returns */
2395 mini_httpd_nommu(server_socket, argc, argv); /* never returns */