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 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 *****************************************************************************
14 * httpd -p 8080 -h $HOME/public_html
15 * For daemon start from rc script with uid=0:
17 * which is equivalent to (assuming user www has uid 80):
18 * httpd -p 80 -u 80 -h $PWD -c /etc/httpd.conf -r "Web Server Authentication"
20 * When an url starts with "/cgi-bin/" it is assumed to be a cgi script.
21 * The server changes directory to the location of the script and executes it
22 * after setting QUERY_STRING and other environment variables.
24 * If directory URL is given, no index.html is found and CGI support is enabled,
25 * cgi-bin/index.cgi will be run. Directory to list is ../$QUERY_STRING.
26 * See httpd_indexcgi.c for an example GCI code.
29 * "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html
31 * The applet can also be invoked as an url arg decoder and html text encoder
33 * foo=`httpd -d $foo` # decode "Hello%20World" as "Hello World"
34 * bar=`httpd -e "<Hello World>"` # encode as "<Hello World>"
35 * Note that url encoding for arguments is not the same as html encoding for
36 * presentation. -d decodes an url-encoded argument while -e encodes in html
39 * httpd.conf has the following format:
41 * H:/serverroot # define the server root. It will override -h
42 * A:172.20. # Allow address from 172.20.0.0/16
43 * A:10.0.0.0/25 # Allow any address from 10.0.0.0-10.0.0.127
44 * A:10.0.0.0/255.255.255.128 # Allow any address that previous set
45 * A:127.0.0.1 # Allow local loopback connections
46 * D:* # Deny from other IP connections
47 * E404:/path/e404.html # /path/e404.html is the 404 (not found) error page
48 * I:index.html # Show index.html when a directory is requested
50 * P:/url:[http://]hostname[:port]/new/path
51 * # When /urlXXXXXX is requested, reverse proxy
52 * # it to http://hostname[:port]/new/pathXXXXXX
54 * /cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/
55 * /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/
56 * /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/
57 * /adm:root:* # or user root, pwd from /etc/passwd on urls starting with /adm/
58 * /wiki:*:* # or any user from /etc/passwd with according pwd on urls starting with /wiki/
59 * .au:audio/basic # additional mime type for audio.au files
60 * *.php:/path/php # run xxx.php through an interpreter
62 * A/D may be as a/d or allow/deny - only first char matters.
63 * Deny/Allow IP logic:
64 * - Default is to allow all (Allow all (A:*) is a no-op).
65 * - Deny rules take precedence over allow rules.
66 * - "Deny all" rule (D:*) is applied last.
69 * 1. Allow only specified addresses
70 * A:172.20 # Allow any address that begins with 172.20.
71 * A:10.10. # Allow any address that begins with 10.10.
72 * A:127.0.0.1 # Allow local loopback connections
73 * D:* # Deny from other IP connections
75 * 2. Only deny specified addresses
76 * D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255
77 * D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255
78 * A:* # (optional line added for clarity)
80 * If a sub directory contains config file, it is parsed and merged with
81 * any existing settings as if it was appended to the original configuration.
83 * subdir paths are relative to the containing subdir and thus cannot
84 * affect the parent rules.
86 * Note that since the sub dir is parsed in the forked thread servicing the
87 * subdir http request, any merge is discarded when the process exits. As a
88 * result, the subdir settings only have a lifetime of a single request.
90 * Custom error pages can contain an absolute path or be relative to
91 * 'home_httpd'. Error pages are to be static files (no CGI or script). Error
92 * page can only be defined in the root configuration file and are not taken
93 * into account in local (directories) config files.
95 * If -c is not set, an attempt will be made to open the default
96 * root configuration file. If -c is set and the file is not found, the
97 * server exits with an error.
100 /* TODO: use TCP_CORK, parse_config() */
102 //usage:#define httpd_trivial_usage
104 //usage: " [-c CONFFILE]"
105 //usage: " [-p [IP:]PORT]"
106 //usage: IF_FEATURE_HTTPD_SETUID(" [-u USER[:GRP]]")
107 //usage: IF_FEATURE_HTTPD_BASIC_AUTH(" [-r REALM]")
108 //usage: " [-h HOME]\n"
109 //usage: "or httpd -d/-e" IF_FEATURE_HTTPD_AUTH_MD5("/-m") " STRING"
110 //usage:#define httpd_full_usage "\n\n"
111 //usage: "Listen for incoming HTTP requests\n"
112 //usage: "\n -i Inetd mode"
113 //usage: "\n -f Don't daemonize"
114 //usage: "\n -v[v] Verbose"
115 //usage: "\n -p [IP:]PORT Bind to IP:PORT (default *:80)"
116 //usage: IF_FEATURE_HTTPD_SETUID(
117 //usage: "\n -u USER[:GRP] Set uid/gid after binding to port")
118 //usage: IF_FEATURE_HTTPD_BASIC_AUTH(
119 //usage: "\n -r REALM Authentication Realm for Basic Authentication")
120 //usage: "\n -h HOME Home directory (default .)"
121 //usage: "\n -c FILE Configuration file (default {/etc,HOME}/httpd.conf)"
122 //usage: IF_FEATURE_HTTPD_AUTH_MD5(
123 //usage: "\n -m STRING MD5 crypt STRING")
124 //usage: "\n -e STRING HTML encode STRING"
125 //usage: "\n -d STRING URL decode STRING"
128 #include "common_bufsiz.h"
130 /* PAM may include <locale.h>. We may need to undefine bbox's stub define: */
132 /* For some obscure reason, PAM is not in pam/xxx, but in security/xxx.
133 * Apparently they like to confuse people. */
134 # include <security/pam_appl.h>
135 # include <security/pam_misc.h>
137 #if ENABLE_FEATURE_USE_SENDFILE
138 # include <sys/sendfile.h>
140 /* amount of buffering in a pipe */
142 # define PIPE_BUF 4096
147 #define IOBUF_SIZE 8192
148 #if PIPE_BUF >= IOBUF_SIZE
149 # error "PIPE_BUF >= IOBUF_SIZE"
152 #define HEADER_READ_TIMEOUT 60
154 static const char DEFAULT_PATH_HTTPD_CONF[] ALIGN1 = "/etc";
155 static const char HTTPD_CONF[] ALIGN1 = "httpd.conf";
156 static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
157 static const char index_html[] ALIGN1 = "index.html";
159 typedef struct has_next_ptr {
160 struct has_next_ptr *next;
163 /* Must have "next" as a first member */
164 typedef struct Htaccess {
165 struct Htaccess *next;
167 char before_colon[1]; /* really bigger, must be last */
170 /* Must have "next" as a first member */
171 typedef struct Htaccess_IP {
172 struct Htaccess_IP *next;
178 /* Must have "next" as a first member */
179 typedef struct Htaccess_Proxy {
180 struct Htaccess_Proxy *next;
188 HTTP_PARTIAL_CONTENT = 206,
189 HTTP_MOVED_TEMPORARILY = 302,
190 HTTP_BAD_REQUEST = 400, /* malformed syntax */
191 HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
192 HTTP_NOT_FOUND = 404,
193 HTTP_FORBIDDEN = 403,
194 HTTP_REQUEST_TIMEOUT = 408,
195 HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */
196 HTTP_INTERNAL_SERVER_ERROR = 500,
198 #if 0 /* future use */
199 HTTP_SWITCHING_PROTOCOLS = 101,
202 HTTP_NON_AUTHORITATIVE_INFO = 203,
203 HTTP_NO_CONTENT = 204,
204 HTTP_MULTIPLE_CHOICES = 300,
205 HTTP_MOVED_PERMANENTLY = 301,
206 HTTP_NOT_MODIFIED = 304,
207 HTTP_PAYMENT_REQUIRED = 402,
208 HTTP_BAD_GATEWAY = 502,
209 HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
213 static const uint16_t http_response_type[] ALIGN2 = {
215 #if ENABLE_FEATURE_HTTPD_RANGES
216 HTTP_PARTIAL_CONTENT,
218 HTTP_MOVED_TEMPORARILY,
219 HTTP_REQUEST_TIMEOUT,
220 HTTP_NOT_IMPLEMENTED,
221 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
227 HTTP_INTERNAL_SERVER_ERROR,
228 #if 0 /* not implemented */
232 HTTP_MULTIPLE_CHOICES,
233 HTTP_MOVED_PERMANENTLY,
236 HTTP_SERVICE_UNAVAILABLE,
240 static const struct {
243 } http_response[ARRAY_SIZE(http_response_type)] = {
245 #if ENABLE_FEATURE_HTTPD_RANGES
246 { "Partial Content", NULL },
249 { "Request Timeout", "No request appeared within 60 seconds" },
250 { "Not Implemented", "The requested method is not recognized" },
251 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
252 { "Unauthorized", "" },
254 { "Not Found", "The requested URL was not found" },
255 { "Bad Request", "Unsupported method" },
257 { "Internal Server Error", "Internal Server Error" },
258 #if 0 /* not implemented */
262 { "Multiple Choices" },
263 { "Moved Permanently" },
265 { "Bad Gateway", "" },
266 { "Service Unavailable", "" },
271 int verbose; /* must be int (used by getopt32) */
272 smallint flg_deny_all;
274 unsigned rmt_ip; /* used for IP-based allow/deny rules */
276 char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */
277 const char *bind_addr_or_port;
280 const char *opt_c_configFile;
281 const char *home_httpd;
282 const char *index_page;
284 const char *found_mime_type;
285 const char *found_moved_temporarily;
286 Htaccess_IP *ip_a_d; /* config allow/deny lines */
288 IF_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
289 IF_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
290 IF_FEATURE_HTTPD_CGI(char *referer;)
291 IF_FEATURE_HTTPD_CGI(char *user_agent;)
292 IF_FEATURE_HTTPD_CGI(char *host;)
293 IF_FEATURE_HTTPD_CGI(char *http_accept;)
294 IF_FEATURE_HTTPD_CGI(char *http_accept_language;)
296 off_t file_size; /* -1 - unknown */
297 #if ENABLE_FEATURE_HTTPD_RANGES
303 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
304 Htaccess *g_auth; /* config user:password lines */
306 Htaccess *mime_a; /* config mime types */
307 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
308 Htaccess *script_i; /* config script interpreters */
310 char *iobuf; /* [IOBUF_SIZE] */
311 #define hdr_buf bb_common_bufsiz1
312 #define sizeof_hdr_buf COMMON_BUFSIZE
315 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
316 const char *http_error_page[ARRAY_SIZE(http_response_type)];
318 #if ENABLE_FEATURE_HTTPD_PROXY
319 Htaccess_Proxy *proxy;
321 #if ENABLE_FEATURE_HTTPD_GZIP
322 /* client can handle gzip / we are going to send gzip */
323 smallint content_gzip;
326 #define G (*ptr_to_globals)
327 #define verbose (G.verbose )
328 #define flg_deny_all (G.flg_deny_all )
329 #define rmt_ip (G.rmt_ip )
330 #define bind_addr_or_port (G.bind_addr_or_port)
331 #define g_query (G.g_query )
332 #define opt_c_configFile (G.opt_c_configFile )
333 #define home_httpd (G.home_httpd )
334 #define index_page (G.index_page )
335 #define found_mime_type (G.found_mime_type )
336 #define found_moved_temporarily (G.found_moved_temporarily)
337 #define last_mod (G.last_mod )
338 #define ip_a_d (G.ip_a_d )
339 #define g_realm (G.g_realm )
340 #define remoteuser (G.remoteuser )
341 #define referer (G.referer )
342 #define user_agent (G.user_agent )
343 #define host (G.host )
344 #define http_accept (G.http_accept )
345 #define http_accept_language (G.http_accept_language)
346 #define file_size (G.file_size )
347 #if ENABLE_FEATURE_HTTPD_RANGES
348 #define range_start (G.range_start )
349 #define range_end (G.range_end )
350 #define range_len (G.range_len )
354 range_end = MAXINT(off_t) - 1,
355 range_len = MAXINT(off_t),
358 #define rmt_ip_str (G.rmt_ip_str )
359 #define g_auth (G.g_auth )
360 #define mime_a (G.mime_a )
361 #define script_i (G.script_i )
362 #define iobuf (G.iobuf )
363 #define hdr_ptr (G.hdr_ptr )
364 #define hdr_cnt (G.hdr_cnt )
365 #define http_error_page (G.http_error_page )
366 #define proxy (G.proxy )
367 #if ENABLE_FEATURE_HTTPD_GZIP
368 # define content_gzip (G.content_gzip )
370 # define content_gzip 0
372 #define INIT_G() do { \
373 setup_common_bufsiz(); \
374 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
375 IF_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
376 IF_FEATURE_HTTPD_RANGES(range_start = -1;) \
377 bind_addr_or_port = "80"; \
378 index_page = index_html; \
383 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
387 SEND_HEADERS = (1 << 0),
388 SEND_BODY = (1 << 1),
389 SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY,
391 static void send_file_and_exit(const char *url, int what) NORETURN;
393 static void free_llist(has_next_ptr **pptr)
395 has_next_ptr *cur = *pptr;
397 has_next_ptr *t = cur;
404 static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
406 free_llist((has_next_ptr**)pptr);
409 static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
411 free_llist((has_next_ptr**)pptr);
414 /* Returns presumed mask width in bits or < 0 on error.
415 * Updates strp, stores IP at provided pointer */
416 static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
418 const char *p = *strp;
426 for (j = 0; j < 4; j++) {
429 if ((*p < '0' || *p > '9') && *p != '/' && *p)
432 while (*p >= '0' && *p <= '9') {
443 ip = (ip << 8) | octet;
457 /* Returns 0 on success. Stores IP and mask at provided pointers */
458 static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
464 i = scan_ip(&str, ipp, '/');
469 /* there is /xxx after dotted-IP address */
470 i = bb_strtou(str, &p, 10);
472 /* 'xxx' itself is dotted-IP mask, parse it */
473 /* (return 0 (success) only if it has N.N.N.N form) */
474 return scan_ip(&str, maskp, '\0') - 32;
483 if (sizeof(unsigned) == 4 && i == 32) {
484 /* mask >>= 32 below may not work */
490 /* i == 0 -> *maskp = 0x00000000
491 * i == 1 -> *maskp = 0x80000000
492 * i == 4 -> *maskp = 0xf0000000
493 * i == 31 -> *maskp = 0xfffffffe
494 * i == 32 -> *maskp = 0xffffffff */
495 *maskp = (uint32_t)(~mask);
500 * Parse configuration file into in-memory linked list.
502 * Any previous IP rules are discarded.
503 * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
504 * are also discarded. That is, previous settings are retained if flag is
506 * Error pages are only parsed on the main config file.
508 * path Path where to look for httpd.conf (without filename).
509 * flag Type of the parse request.
513 FIRST_PARSE = 0, /* path will be "/etc" */
514 SIGNALED_PARSE = 1, /* path will be "/etc" */
515 SUBDIR_PARSE = 2, /* path will be derived from URL */
517 static void parse_conf(const char *path, int flag)
519 /* internally used extra flag state */
520 enum { TRY_CURDIR_PARSE = 3 };
523 const char *filename;
526 /* discard old rules */
527 free_Htaccess_IP_list(&ip_a_d);
529 /* retain previous auth and mime config only for subdir parse */
530 if (flag != SUBDIR_PARSE) {
531 free_Htaccess_list(&mime_a);
532 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
533 free_Htaccess_list(&g_auth);
535 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
536 free_Htaccess_list(&script_i);
540 filename = opt_c_configFile;
541 if (flag == SUBDIR_PARSE || filename == NULL) {
542 filename = alloca(strlen(path) + sizeof(HTTPD_CONF) + 2);
543 sprintf((char *)filename, "%s/%s", path, HTTPD_CONF);
546 while ((f = fopen_for_read(filename)) == NULL) {
547 if (flag >= SUBDIR_PARSE) { /* SUBDIR or TRY_CURDIR */
548 /* config file not found, no changes to config */
551 if (flag == FIRST_PARSE) {
552 /* -c CONFFILE given, but CONFFILE doesn't exist? */
553 if (opt_c_configFile)
554 bb_simple_perror_msg_and_die(opt_c_configFile);
555 /* else: no -c, thus we looked at /etc/httpd.conf,
556 * and it's not there. try ./httpd.conf: */
558 flag = TRY_CURDIR_PARSE;
559 filename = HTTPD_CONF;
562 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
563 /* in "/file:user:pass" lines, we prepend path in subdirs */
564 if (flag != SUBDIR_PARSE)
569 * I:default_index_file
571 * [AD]:IP[/mask] # allow/deny, * for wildcard
572 * Ennn:error.html # error page for status nnn
573 * P:/url:[http://]hostname[:port]/new/path # reverse proxy
574 * .ext:mime/type # mime type
575 * *.php:/path/php # run xxx.php through an interpreter
576 * /file:user:pass # username and password
578 while (fgets(buf, sizeof(buf), f) != NULL) {
583 { /* remove all whitespace, and # comments */
587 /* skip non-whitespace beginning. Often the whole line
588 * is non-whitespace. We want this case to work fast,
589 * without needless copying, therefore we don't merge
590 * this operation into next while loop. */
591 while ((ch = *p0) != '\0' && ch != '\n' && ch != '#'
592 && ch != ' ' && ch != '\t'
597 /* if we enter this loop, we have some whitespace.
599 while (ch != '\0' && ch != '\n' && ch != '#') {
600 if (ch != ' ' && ch != '\t') {
606 strlen_buf = p - buf;
608 continue; /* empty line */
611 after_colon = strchr(buf, ':');
613 if (after_colon == NULL || *++after_colon == '\0')
616 ch = (buf[0] & ~0x20); /* toupper if it's a letter */
619 if (index_page != index_html)
620 free((char*)index_page);
621 index_page = xstrdup(after_colon);
625 /* do not allow jumping around using H in subdir's configs */
626 if (flag == FIRST_PARSE && ch == 'H') {
627 home_httpd = xstrdup(after_colon);
632 if (ch == 'A' || ch == 'D') {
635 if (*after_colon == '*') {
637 /* memorize "deny all" */
640 /* skip assumed "A:*", it is a default anyway */
643 /* store "allow/deny IP/mask" line */
644 pip = xzalloc(sizeof(*pip));
645 if (scan_ip_mask(after_colon, &pip->ip, &pip->mask)) {
646 /* IP{/mask} syntax error detected, protect all */
650 pip->allow_deny = ch;
652 /* Deny:from_IP - prepend */
656 /* A:from_IP - append (thus all D's precedes A's) */
657 Htaccess_IP *prev_IP = ip_a_d;
658 if (prev_IP == NULL) {
661 while (prev_IP->next)
662 prev_IP = prev_IP->next;
669 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
670 if (flag == FIRST_PARSE && ch == 'E') {
672 int status = atoi(buf + 1); /* error status code */
674 if (status < HTTP_CONTINUE) {
677 /* then error page; find matching status */
678 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
679 if (http_response_type[i] == status) {
680 /* We chdir to home_httpd, thus no need to
681 * concat_path_file(home_httpd, after_colon)
683 http_error_page[i] = xstrdup(after_colon);
691 #if ENABLE_FEATURE_HTTPD_PROXY
692 if (flag == FIRST_PARSE && ch == 'P') {
693 /* P:/url:[http://]hostname[:port]/new/path */
694 char *url_from, *host_port, *url_to;
695 Htaccess_Proxy *proxy_entry;
697 url_from = after_colon;
698 host_port = strchr(after_colon, ':');
699 if (host_port == NULL) {
703 if (is_prefixed_with(host_port, "http://"))
705 if (*host_port == '\0') {
708 url_to = strchr(host_port, '/');
709 if (url_to == NULL) {
713 proxy_entry = xzalloc(sizeof(*proxy_entry));
714 proxy_entry->url_from = xstrdup(url_from);
715 proxy_entry->host_port = xstrdup(host_port);
717 proxy_entry->url_to = xstrdup(url_to);
718 proxy_entry->next = proxy;
723 /* the rest of directives are non-alphabetic,
724 * must avoid using "toupper'ed" ch */
727 if (ch == '.' /* ".ext:mime/type" */
728 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
729 || (ch == '*' && buf[1] == '.') /* "*.php:/path/php" */
735 cur = xzalloc(sizeof(*cur) /* includes space for NUL */ + strlen_buf);
736 strcpy(cur->before_colon, buf);
737 p = cur->before_colon + (after_colon - buf);
739 cur->after_colon = p;
741 /* .mime line: prepend to mime_a list */
745 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
747 /* script interpreter line: prepend to script_i list */
748 cur->next = script_i;
755 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
756 if (ch == '/') { /* "/file:user:pass" */
761 /* note: path is "" unless we are in SUBDIR parse,
762 * otherwise it does NOT start with "/" */
763 cur = xzalloc(sizeof(*cur) /* includes space for NUL */
767 /* form "/path/file" */
768 sprintf(cur->before_colon, "/%s%.*s",
770 (int) (after_colon - buf - 1), /* includes "/", but not ":" */
772 /* canonicalize it */
773 p = bb_simplify_abs_path_inplace(cur->before_colon);
774 file_len = p - cur->before_colon;
775 /* add "user:pass" after NUL */
776 strcpy(++p, after_colon);
777 cur->after_colon = p;
779 /* insert cur into g_auth */
780 /* g_auth is sorted by decreased filename length */
782 Htaccess *auth, **authp;
785 while ((auth = *authp) != NULL) {
786 if (file_len >= strlen(auth->before_colon)) {
787 /* insert cur before auth */
797 #endif /* BASIC_AUTH */
799 /* the line is not recognized */
801 bb_error_msg("config error '%s' in '%s'", buf, filename);
802 } /* while (fgets) */
807 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
809 * Given a string, html-encode special characters.
810 * This is used for the -e command line option to provide an easy way
811 * for scripts to encode result data without confusing browsers. The
812 * returned string pointer is memory allocated by malloc().
814 * Returns a pointer to the encoded string (malloced).
816 static char *encodeString(const char *string)
818 /* take the simple route and encode everything */
819 /* could possibly scan once to get length. */
820 int len = strlen(string);
821 char *out = xmalloc(len * 6 + 1);
825 while ((ch = *string++) != '\0') {
826 /* very simple check for what to encode */
830 p += sprintf(p, "&#%d;", (unsigned char) ch);
837 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
839 * Decode a base64 data stream as per rfc1521.
840 * Note that the rfc states that non base64 chars are to be ignored.
841 * Since the decode always results in a shorter size than the input,
842 * it is OK to pass the input arg as an output arg.
843 * Parameter: a pointer to a base64 encoded string.
844 * Decoded data is stored in-place.
846 static void decodeBase64(char *Data)
848 const unsigned char *in = (const unsigned char *)Data;
849 /* The decoded size will be at most 3/4 the size of the encoded */
856 if (t >= '0' && t <= '9')
858 else if (t >= 'A' && t <= 'Z')
860 else if (t >= 'a' && t <= 'z')
874 *Data++ = (char) (ch >> 16);
875 *Data++ = (char) (ch >> 8);
885 * Create a listen server socket on the designated port.
887 static int openServer(void)
889 unsigned n = bb_strtou(bind_addr_or_port, NULL, 10);
890 if (!errno && n && n <= 0xffff)
891 n = create_and_bind_stream_or_die(NULL, n);
893 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
899 * Log the connection closure and exit.
901 static void log_and_exit(void) NORETURN;
902 static void log_and_exit(void)
904 /* Paranoia. IE said to be buggy. It may send some extra data
905 * or be confused by us just exiting without SHUT_WR. Oh well. */
906 shutdown(1, SHUT_WR);
908 (this also messes up stdin when user runs httpd -i from terminal)
910 while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0)
915 bb_error_msg("closed");
916 _exit(xfunc_error_retval);
920 * Create and send HTTP response headers.
921 * The arguments are combined and sent as one write operation. Note that
922 * IE will puke big-time if the headers are not sent in one packet and the
923 * second packet is delayed for any reason.
924 * responseNum - the result code to send.
926 static void send_headers(int responseNum)
928 static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
930 const char *responseString = "";
931 const char *infoString = NULL;
932 const char *mime_type;
933 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
934 const char *error_page = NULL;
937 time_t timer = time(NULL);
941 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
942 if (http_response_type[i] == responseNum) {
943 responseString = http_response[i].name;
944 infoString = http_response[i].info;
945 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
946 error_page = http_error_page[i];
951 /* error message is HTML */
952 mime_type = responseNum == HTTP_OK ?
953 found_mime_type : "text/html";
956 bb_error_msg("response:%u", responseNum);
958 /* emit the current date */
959 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
961 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
962 "Date: %s\r\nConnection: close\r\n",
963 responseNum, responseString, mime_type, tmp_str);
965 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
966 if (responseNum == HTTP_UNAUTHORIZED) {
967 len += sprintf(iobuf + len,
968 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
972 if (responseNum == HTTP_MOVED_TEMPORARILY) {
973 /* Responding to "GET /dir" with
974 * "HTTP/1.0 302 Found" "Location: /dir/"
975 * - IOW, asking them to repeat with a slash.
976 * Here, overflow IS possible, can't use sprintf:
978 * python -c 'print("get /test?" + ("x" * 8192))' | busybox httpd -i -h .
980 len += snprintf(iobuf + len, IOBUF_SIZE-3 - len,
981 "Location: %s/%s%s\r\n",
982 found_moved_temporarily,
983 (g_query ? "?" : ""),
984 (g_query ? g_query : ""));
985 if (len > IOBUF_SIZE-3)
989 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
990 if (error_page && access(error_page, R_OK) == 0) {
995 fprintf(stderr, "headers: '%s'\n", iobuf);
997 full_write(STDOUT_FILENO, iobuf, len);
999 fprintf(stderr, "writing error page: '%s'\n", error_page);
1000 return send_file_and_exit(error_page, SEND_BODY);
1004 if (file_size != -1) { /* file */
1005 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
1006 #if ENABLE_FEATURE_HTTPD_RANGES
1007 if (responseNum == HTTP_PARTIAL_CONTENT) {
1008 len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"u-%"OFF_FMT"u/%"OFF_FMT"u\r\n",
1012 file_size = range_end - range_start + 1;
1015 len += sprintf(iobuf + len,
1016 #if ENABLE_FEATURE_HTTPD_RANGES
1017 "Accept-Ranges: bytes\r\n"
1019 "Last-Modified: %s\r\n%s %"OFF_FMT"u\r\n",
1021 content_gzip ? "Transfer-length:" : "Content-length:",
1027 len += sprintf(iobuf + len, "Content-Encoding: gzip\r\n");
1029 iobuf[len++] = '\r';
1030 iobuf[len++] = '\n';
1032 len += sprintf(iobuf + len,
1033 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
1034 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
1035 responseNum, responseString,
1036 responseNum, responseString, infoString);
1040 fprintf(stderr, "headers: '%s'\n", iobuf);
1042 if (full_write(STDOUT_FILENO, iobuf, len) != len) {
1044 bb_perror_msg("error");
1049 static void send_headers_and_exit(int responseNum) NORETURN;
1050 static void send_headers_and_exit(int responseNum)
1052 IF_FEATURE_HTTPD_GZIP(content_gzip = 0;)
1053 send_headers(responseNum);
1058 * Read from the socket until '\n' or EOF. '\r' chars are removed.
1059 * '\n' is replaced with NUL.
1060 * Return number of characters read or 0 if nothing is read
1061 * ('\r' and '\n' are not counted).
1062 * Data is returned in iobuf.
1064 static int get_line(void)
1069 alarm(HEADER_READ_TIMEOUT);
1072 hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof_hdr_buf);
1077 iobuf[count] = c = *hdr_ptr++;
1083 iobuf[count] = '\0';
1086 if (count < (IOBUF_SIZE - 1)) /* check overflow */
1092 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1094 /* gcc 4.2.1 fares better with NOINLINE */
1095 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN;
1096 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1098 enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1099 struct pollfd pfd[3];
1100 int out_cnt; /* we buffer a bit of initial CGI output */
1103 /* iobuf is used for CGI -> network data,
1104 * hdr_buf is for network -> CGI data (POSTDATA) */
1106 /* If CGI dies, we still want to correctly finish reading its output
1107 * and send it to the peer. So please no SIGPIPEs! */
1108 signal(SIGPIPE, SIG_IGN);
1110 // We inconsistently handle a case when more POSTDATA from network
1111 // is coming than we expected. We may give *some part* of that
1112 // extra data to CGI.
1114 //if (hdr_cnt > post_len) {
1115 // /* We got more POSTDATA from network than we expected */
1116 // hdr_cnt = post_len;
1118 post_len -= hdr_cnt;
1119 /* post_len - number of POST bytes not yet read from network */
1121 /* NB: breaking out of this loop jumps to log_and_exit() */
1123 pfd[FROM_CGI].fd = fromCgi_rd;
1124 pfd[FROM_CGI].events = POLLIN;
1125 pfd[TO_CGI].fd = toCgi_wr;
1127 /* Note: even pfd[0].events == 0 won't prevent
1128 * revents == POLLHUP|POLLERR reports from closed stdin.
1129 * Setting fd to -1 works: */
1131 pfd[0].events = POLLIN;
1132 pfd[0].revents = 0; /* probably not needed, paranoia */
1134 /* We always poll this fd, thus kernel always sets revents: */
1135 /*pfd[FROM_CGI].events = POLLIN; - moved out of loop */
1136 /*pfd[FROM_CGI].revents = 0; - not needed */
1138 /* gcc-4.8.0 still doesnt fill two shorts with one insn :( */
1139 /* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47059 */
1140 /* hopefully one day it will... */
1141 pfd[TO_CGI].events = POLLOUT;
1142 pfd[TO_CGI].revents = 0; /* needed! */
1144 if (toCgi_wr && hdr_cnt <= 0) {
1146 /* Expect more POST data from network */
1149 /* post_len <= 0 && hdr_cnt <= 0:
1150 * no more POST data to CGI,
1151 * let CGI see EOF on CGI's stdin */
1152 if (toCgi_wr != fromCgi_rd)
1158 /* Now wait on the set of sockets */
1159 count = safe_poll(pfd, hdr_cnt > 0 ? TO_CGI+1 : FROM_CGI+1, -1);
1162 if (safe_waitpid(pid, &status, WNOHANG) <= 0) {
1163 /* Weird. CGI didn't exit and no fd's
1164 * are ready, yet poll returned?! */
1167 if (DEBUG && WIFEXITED(status))
1168 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1169 if (DEBUG && WIFSIGNALED(status))
1170 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1175 if (pfd[TO_CGI].revents) {
1176 /* hdr_cnt > 0 here due to the way poll() called */
1177 /* Have data from peer and can write to CGI */
1178 count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1179 /* Doesn't happen, we dont use nonblocking IO here
1180 *if (count < 0 && errno == EAGAIN) {
1187 /* EOF/broken pipe to CGI, stop piping POST data */
1188 hdr_cnt = post_len = 0;
1192 if (pfd[0].revents) {
1193 /* post_len > 0 && hdr_cnt == 0 here */
1194 /* We expect data, prev data portion is eaten by CGI
1195 * and there *is* data to read from the peer
1197 //count = post_len > (int)sizeof_hdr_buf ? (int)sizeof_hdr_buf : post_len;
1198 //count = safe_read(STDIN_FILENO, hdr_buf, count);
1199 count = safe_read(STDIN_FILENO, hdr_buf, sizeof_hdr_buf);
1205 /* no more POST data can be read */
1210 if (pfd[FROM_CGI].revents) {
1211 /* There is something to read from CGI */
1214 /* Are we still buffering CGI output? */
1216 /* HTTP_200[] has single "\r\n" at the end.
1217 * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1218 * CGI scripts MUST send their own header terminated by
1219 * empty line, then data. That's why we have only one
1220 * <cr><lf> pair here. We will output "200 OK" line
1221 * if needed, but CGI still has to provide blank line
1222 * between header and body */
1224 /* Must use safe_read, not full_read, because
1225 * CGI may output a few first bytes and then wait
1226 * for POSTDATA without closing stdout.
1227 * With full_read we may wait here forever. */
1228 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1230 /* eof (or error) and there was no "HTTP",
1231 * so write it, then write received data */
1233 full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1);
1234 full_write(STDOUT_FILENO, rbuf, out_cnt);
1236 break; /* CGI stdout is closed, exiting */
1240 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1241 if (out_cnt >= 7 && memcmp(rbuf, "Status:", 7) == 0) {
1242 /* send "HTTP/1.0 " */
1243 if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9)
1245 rbuf += 7; /* skip "Status:" */
1246 count = out_cnt - 7;
1247 out_cnt = -1; /* buffering off */
1248 } else if (out_cnt >= 4) {
1249 /* Did CGI add "HTTP"? */
1250 if (memcmp(rbuf, HTTP_200, 4) != 0) {
1251 /* there is no "HTTP", do it ourself */
1252 if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1256 if (!strstr(rbuf, "ontent-")) {
1257 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1259 * Counter-example of valid CGI without Content-type:
1260 * echo -en "HTTP/1.0 302 Found\r\n"
1261 * echo -en "Location: http://www.busybox.net\r\n"
1265 out_cnt = -1; /* buffering off */
1268 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1270 break; /* eof (or error) */
1272 if (full_write(STDOUT_FILENO, rbuf, count) != count)
1275 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1276 } /* if (pfd[FROM_CGI].revents) */
1282 #if ENABLE_FEATURE_HTTPD_CGI
1284 static void setenv1(const char *name, const char *value)
1286 setenv(name, value ? value : "", 1);
1290 * Spawn CGI script, forward CGI's stdin/out <=> network
1292 * Environment variables are set up and the script is invoked with pipes
1293 * for stdin/stdout. If a POST is being done the script is fed the POST
1294 * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1297 * const char *url The requested URL (with leading /).
1298 * const char *orig_uri The original URI before rewriting (if any)
1299 * int post_len Length of the POST body.
1300 * const char *cookie For set HTTP_COOKIE.
1301 * const char *content_type For set CONTENT_TYPE.
1303 static void send_cgi_and_exit(
1305 const char *orig_uri,
1306 const char *request,
1309 const char *content_type) NORETURN;
1310 static void send_cgi_and_exit(
1312 const char *orig_uri,
1313 const char *request,
1316 const char *content_type)
1318 struct fd_pair fromCgi; /* CGI -> httpd pipe */
1319 struct fd_pair toCgi; /* httpd -> CGI pipe */
1320 char *script, *last_slash;
1323 /* Make a copy. NB: caller guarantees:
1324 * url[0] == '/', url[1] != '/' */
1328 * We are mucking with environment _first_ and then vfork/exec,
1329 * this allows us to use vfork safely. Parent doesn't care about
1330 * these environment changes anyway.
1333 /* Check for [dirs/]script.cgi/PATH_INFO */
1334 last_slash = script = (char*)url;
1335 while ((script = strchr(script + 1, '/')) != NULL) {
1338 dir = is_directory(url + 1, /*followlinks:*/ 1);
1341 /* not directory, found script.cgi/PATH_INFO */
1344 /* is directory, find next '/' */
1345 last_slash = script;
1347 setenv1("PATH_INFO", script); /* set to /PATH_INFO or "" */
1348 setenv1("REQUEST_METHOD", request);
1350 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", orig_uri, g_query));
1352 setenv1("REQUEST_URI", orig_uri);
1355 *script = '\0'; /* cut off /PATH_INFO */
1357 /* SCRIPT_FILENAME is required by PHP in CGI mode */
1358 if (home_httpd[0] == '/') {
1359 char *fullpath = concat_path_file(home_httpd, url);
1360 setenv1("SCRIPT_FILENAME", fullpath);
1362 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1363 setenv1("SCRIPT_NAME", url);
1364 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1365 * QUERY_STRING: The information which follows the ? in the URL
1366 * which referenced this script. This is the query information.
1367 * It should not be decoded in any fashion. This variable
1368 * should always be set when there is query information,
1369 * regardless of command line decoding. */
1370 /* (Older versions of bbox seem to do some decoding) */
1371 setenv1("QUERY_STRING", g_query);
1372 putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1373 putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1374 putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1375 /* Having _separate_ variables for IP and port defeats
1376 * the purpose of having socket abstraction. Which "port"
1377 * are you using on Unix domain socket?
1378 * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1381 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1382 char *cp = strrchr(p, ':');
1383 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1385 if (cp) *cp = '\0'; /* delete :PORT */
1386 setenv1("REMOTE_ADDR", p);
1389 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1390 setenv1("REMOTE_PORT", cp + 1);
1394 setenv1("HTTP_USER_AGENT", user_agent);
1396 setenv1("HTTP_ACCEPT", http_accept);
1397 if (http_accept_language)
1398 setenv1("HTTP_ACCEPT_LANGUAGE", http_accept_language);
1400 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1402 setenv1("HTTP_COOKIE", cookie);
1404 setenv1("CONTENT_TYPE", content_type);
1405 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1407 setenv1("REMOTE_USER", remoteuser);
1408 putenv((char*)"AUTH_TYPE=Basic");
1412 setenv1("HTTP_REFERER", referer);
1413 setenv1("HTTP_HOST", host); /* set to "" if NULL */
1414 /* setenv1("SERVER_NAME", safe_gethostname()); - don't do this,
1415 * just run "env SERVER_NAME=xyz httpd ..." instead */
1417 xpiped_pair(fromCgi);
1422 /* TODO: log perror? */
1430 xfunc_error_retval = 242;
1432 /* NB: close _first_, then move fds! */
1435 xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */
1436 xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */
1437 /* User seeing stderr output can be a security problem.
1438 * If CGI really wants that, it can always do dup itself. */
1441 /* Chdiring to script's dir */
1442 script = last_slash;
1443 if (script != url) { /* paranoia */
1445 if (chdir(url + 1) != 0) {
1446 bb_perror_msg("can't change directory to '%s'", url + 1);
1447 goto error_execing_cgi;
1449 // not needed: *script = '/';
1453 /* set argv[0] to name without path */
1457 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1459 char *suffix = strrchr(script, '.');
1463 for (cur = script_i; cur; cur = cur->next) {
1464 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1465 /* found interpreter name */
1466 argv[0] = cur->after_colon;
1475 /* restore default signal dispositions for CGI process */
1482 /* _NOT_ execvp. We do not search PATH. argv[0] is a filename
1483 * without any dir components and will only match a file
1484 * in the current directory */
1485 execv(argv[0], argv);
1487 bb_perror_msg("can't execute '%s'", argv[0]);
1490 * (we are CGI here, our stdout is pumped to the net) */
1491 send_headers_and_exit(HTTP_NOT_FOUND);
1494 /* Parent process */
1496 /* Restore variables possibly changed by child */
1497 xfunc_error_retval = 0;
1502 cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1505 #endif /* FEATURE_HTTPD_CGI */
1508 * Send a file response to a HTTP request, and exit
1511 * const char *url The requested URL (with leading /).
1512 * what What to send (headers/body/both).
1514 static NOINLINE void send_file_and_exit(const char *url, int what)
1521 /* does <url>.gz exist? Then use it instead */
1522 char *gzurl = xasprintf("%s.gz", url);
1523 fd = open(gzurl, O_RDONLY);
1528 file_size = sb.st_size;
1529 last_mod = sb.st_mtime;
1531 IF_FEATURE_HTTPD_GZIP(content_gzip = 0;)
1532 fd = open(url, O_RDONLY);
1535 fd = open(url, O_RDONLY);
1539 bb_perror_msg("can't open '%s'", url);
1540 /* Error pages are sent by using send_file_and_exit(SEND_BODY).
1541 * IOW: it is unsafe to call send_headers_and_exit
1542 * if what is SEND_BODY! Can recurse! */
1543 if (what != SEND_BODY)
1544 send_headers_and_exit(HTTP_NOT_FOUND);
1547 /* If you want to know about EPIPE below
1548 * (happens if you abort downloads from local httpd): */
1549 signal(SIGPIPE, SIG_IGN);
1551 /* If not found, default is "application/octet-stream" */
1552 found_mime_type = "application/octet-stream";
1553 suffix = strrchr(url, '.');
1555 static const char suffixTable[] ALIGN1 =
1556 /* Shorter suffix must be first:
1557 * ".html.htm" will fail for ".htm"
1559 ".txt.h.c.cc.cpp\0" "text/plain\0"
1560 /* .htm line must be after .h line */
1561 ".htm.html\0" "text/html\0"
1562 ".jpg.jpeg\0" "image/jpeg\0"
1563 ".gif\0" "image/gif\0"
1564 ".png\0" "image/png\0"
1565 /* .css line must be after .c line */
1566 ".css\0" "text/css\0"
1567 ".wav\0" "audio/wav\0"
1568 ".avi\0" "video/x-msvideo\0"
1569 ".qt.mov\0" "video/quicktime\0"
1570 ".mpe.mpeg\0" "video/mpeg\0"
1571 ".mid.midi\0" "audio/midi\0"
1572 ".mp3\0" "audio/mpeg\0"
1573 #if 0 /* unpopular */
1574 ".au\0" "audio/basic\0"
1575 ".pac\0" "application/x-ns-proxy-autoconfig\0"
1576 ".vrml.wrl\0" "model/vrml\0"
1578 /* compiler adds another "\0" here */
1582 /* Examine built-in table */
1583 const char *table = suffixTable;
1584 const char *table_next;
1585 for (; *table; table = table_next) {
1586 const char *try_suffix;
1587 const char *mime_type;
1588 mime_type = table + strlen(table) + 1;
1589 table_next = mime_type + strlen(mime_type) + 1;
1590 try_suffix = strstr(table, suffix);
1593 try_suffix += strlen(suffix);
1594 if (*try_suffix == '\0' || *try_suffix == '.') {
1595 found_mime_type = mime_type;
1598 /* Example: strstr(table, ".av") != NULL, but it
1599 * does not match ".avi" after all and we end up here.
1600 * The table is arranged so that in this case we know
1601 * that it can't match anything in the following lines,
1602 * and we stop the search: */
1605 /* ...then user's table */
1606 for (cur = mime_a; cur; cur = cur->next) {
1607 if (strcmp(cur->before_colon, suffix) == 0) {
1608 found_mime_type = cur->after_colon;
1615 bb_error_msg("sending file '%s' content-type: %s",
1616 url, found_mime_type);
1618 #if ENABLE_FEATURE_HTTPD_RANGES
1619 if (what == SEND_BODY /* err pages and ranges don't mix */
1620 || content_gzip /* we are sending compressed page: can't do ranges */ ///why?
1624 range_len = MAXINT(off_t);
1625 if (range_start >= 0) {
1626 if (!range_end || range_end > file_size - 1) {
1627 range_end = file_size - 1;
1629 if (range_end < range_start
1630 || lseek(fd, range_start, SEEK_SET) != range_start
1632 lseek(fd, 0, SEEK_SET);
1635 range_len = range_end - range_start + 1;
1636 send_headers(HTTP_PARTIAL_CONTENT);
1641 if (what & SEND_HEADERS)
1642 send_headers(HTTP_OK);
1643 #if ENABLE_FEATURE_USE_SENDFILE
1645 off_t offset = range_start;
1647 /* sz is rounded down to 64k */
1648 ssize_t sz = MAXINT(ssize_t) - 0xffff;
1649 IF_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1650 count = sendfile(STDOUT_FILENO, fd, &offset, sz);
1652 if (offset == range_start)
1653 break; /* fall back to read/write loop */
1656 IF_FEATURE_HTTPD_RANGES(range_len -= count;)
1657 if (count == 0 || range_len == 0)
1662 while ((count = safe_read(fd, iobuf, IOBUF_SIZE)) > 0) {
1664 IF_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1665 n = full_write(STDOUT_FILENO, iobuf, count);
1668 IF_FEATURE_HTTPD_RANGES(range_len -= count;)
1673 IF_FEATURE_USE_SENDFILE(fin:)
1675 bb_perror_msg("error");
1680 static int checkPermIP(void)
1684 for (cur = ip_a_d; cur; cur = cur->next) {
1687 "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1689 (unsigned char)(cur->ip >> 24),
1690 (unsigned char)(cur->ip >> 16),
1691 (unsigned char)(cur->ip >> 8),
1692 (unsigned char)(cur->ip),
1693 (unsigned char)(cur->mask >> 24),
1694 (unsigned char)(cur->mask >> 16),
1695 (unsigned char)(cur->mask >> 8),
1696 (unsigned char)(cur->mask)
1699 if ((rmt_ip & cur->mask) == cur->ip)
1700 return (cur->allow_deny == 'A'); /* A -> 1 */
1703 return !flg_deny_all; /* depends on whether we saw "D:*" */
1706 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1709 struct pam_userinfo {
1714 static int pam_talker(int num_msg,
1715 const struct pam_message **msg,
1716 struct pam_response **resp,
1720 struct pam_userinfo *userinfo = (struct pam_userinfo *) appdata_ptr;
1721 struct pam_response *response;
1723 if (!resp || !msg || !userinfo)
1724 return PAM_CONV_ERR;
1726 /* allocate memory to store response */
1727 response = xzalloc(num_msg * sizeof(*response));
1730 for (i = 0; i < num_msg; i++) {
1733 switch (msg[i]->msg_style) {
1734 case PAM_PROMPT_ECHO_ON:
1737 case PAM_PROMPT_ECHO_OFF:
1746 return PAM_CONV_ERR;
1748 response[i].resp = xstrdup(s);
1749 if (PAM_SUCCESS != 0)
1750 response[i].resp_retcode = PAM_SUCCESS;
1758 * Config file entries are of the form "/<path>:<user>:<passwd>".
1759 * If config file has no prefix match for path, access is allowed.
1761 * path The file path
1762 * user_and_passwd "user:passwd" to validate
1764 * Returns 1 if user_and_passwd is OK.
1766 static int check_user_passwd(const char *path, char *user_and_passwd)
1769 const char *prev = NULL;
1771 for (cur = g_auth; cur; cur = cur->next) {
1772 const char *dir_prefix;
1776 dir_prefix = cur->before_colon;
1779 /* If already saw a match, don't accept other different matches */
1780 if (prev && strcmp(prev, dir_prefix) != 0)
1784 fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd);
1786 /* If it's not a prefix match, continue searching */
1787 len = strlen(dir_prefix);
1788 if (len != 1 /* dir_prefix "/" matches all, don't need to check */
1789 && (strncmp(dir_prefix, path, len) != 0
1790 || (path[len] != '/' && path[len] != '\0')
1796 /* Path match found */
1799 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1800 char *colon_after_user;
1802 # if ENABLE_FEATURE_SHADOWPASSWDS && !ENABLE_PAM
1806 colon_after_user = strchr(user_and_passwd, ':');
1807 if (!colon_after_user)
1810 /* compare "user:" */
1811 if (cur->after_colon[0] != '*'
1812 && strncmp(cur->after_colon, user_and_passwd,
1813 colon_after_user - user_and_passwd + 1) != 0
1817 /* this cfg entry is '*' or matches username from peer */
1819 passwd = strchr(cur->after_colon, ':');
1823 if (passwd[0] == '*') {
1825 struct pam_userinfo userinfo;
1826 struct pam_conv conv_info = { &pam_talker, (void *) &userinfo };
1829 *colon_after_user = '\0';
1830 userinfo.name = user_and_passwd;
1831 userinfo.pw = colon_after_user + 1;
1832 r = pam_start("httpd", user_and_passwd, &conv_info, &pamh) != PAM_SUCCESS;
1834 r = pam_authenticate(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS
1835 || pam_acct_mgmt(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS
1837 pam_end(pamh, PAM_SUCCESS);
1839 *colon_after_user = ':';
1840 goto end_check_passwd;
1842 # if ENABLE_FEATURE_SHADOWPASSWDS
1843 /* Using _r function to avoid pulling in static buffers */
1848 *colon_after_user = '\0';
1849 pw = getpwnam(user_and_passwd);
1850 *colon_after_user = ':';
1851 if (!pw || !pw->pw_passwd)
1853 passwd = pw->pw_passwd;
1854 # if ENABLE_FEATURE_SHADOWPASSWDS
1855 if ((passwd[0] == 'x' || passwd[0] == '*') && !passwd[1]) {
1856 /* getspnam_r may return 0 yet set result to NULL.
1857 * At least glibc 2.4 does this. Be extra paranoid here. */
1858 struct spwd *result = NULL;
1859 r = getspnam_r(pw->pw_name, &spw, sp_buf, sizeof(sp_buf), &result);
1860 if (r == 0 && result)
1861 passwd = result->sp_pwdp;
1864 /* In this case, passwd is ALWAYS encrypted:
1865 * it came from /etc/passwd or /etc/shadow!
1867 goto check_encrypted;
1868 # endif /* ENABLE_PAM */
1870 /* Else: passwd is from httpd.conf, it is either plaintext or encrypted */
1872 if (passwd[0] == '$' && isdigit(passwd[1])) {
1877 /* encrypt pwd from peer and check match with local one */
1878 encrypted = pw_encrypt(
1879 /* pwd (from peer): */ colon_after_user + 1,
1883 r = strcmp(encrypted, passwd);
1886 /* local passwd is from httpd.conf and it's plaintext */
1887 r = strcmp(colon_after_user + 1, passwd);
1889 goto end_check_passwd;
1892 /* Comparing plaintext "user:pass" in one go */
1893 r = strcmp(cur->after_colon, user_and_passwd);
1896 remoteuser = xstrndup(user_and_passwd,
1897 strchrnul(user_and_passwd, ':') - user_and_passwd
1903 /* 0(bad) if prev is set: matches were found but passwd was wrong */
1904 return (prev == NULL);
1906 #endif /* FEATURE_HTTPD_BASIC_AUTH */
1908 #if ENABLE_FEATURE_HTTPD_PROXY
1909 static Htaccess_Proxy *find_proxy_entry(const char *url)
1912 for (p = proxy; p; p = p->next) {
1913 if (is_prefixed_with(url, p->url_from))
1923 static void send_REQUEST_TIMEOUT_and_exit(int sig) NORETURN;
1924 static void send_REQUEST_TIMEOUT_and_exit(int sig UNUSED_PARAM)
1926 send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1930 * Handle an incoming http request and exit.
1932 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN;
1933 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1935 static const char request_GET[] ALIGN1 = "GET";
1940 #if ENABLE_FEATURE_HTTPD_CGI
1941 static const char request_HEAD[] ALIGN1 = "HEAD";
1942 const char *prequest;
1943 char *cookie = NULL;
1944 char *content_type = NULL;
1945 unsigned long length = 0;
1946 #elif ENABLE_FEATURE_HTTPD_PROXY
1947 #define prequest request_GET
1948 unsigned long length = 0;
1950 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1951 smallint authorized = -1;
1953 smallint ip_allowed;
1954 char http_major_version;
1955 #if ENABLE_FEATURE_HTTPD_PROXY
1956 char http_minor_version;
1957 char *header_buf = header_buf; /* for gcc */
1958 char *header_ptr = header_ptr;
1959 Htaccess_Proxy *proxy_entry;
1962 /* Allocation of iobuf is postponed until now
1963 * (IOW, server process doesn't need to waste 8k) */
1964 iobuf = xmalloc(IOBUF_SIZE);
1967 if (fromAddr->u.sa.sa_family == AF_INET) {
1968 rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr);
1970 #if ENABLE_FEATURE_IPV6
1971 if (fromAddr->u.sa.sa_family == AF_INET6
1972 && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0
1973 && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0
1974 && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1975 rmt_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]);
1977 if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1978 /* NB: can be NULL (user runs httpd -i by hand?) */
1979 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa);
1982 /* this trick makes -v logging much simpler */
1984 applet_name = rmt_ip_str;
1986 bb_error_msg("connected");
1989 /* Install timeout handler. get_line() needs it. */
1990 signal(SIGALRM, send_REQUEST_TIMEOUT_and_exit);
1992 if (!get_line()) /* EOF or error or empty line */
1993 send_headers_and_exit(HTTP_BAD_REQUEST);
1995 /* Determine type of request (GET/POST) */
1996 // rfc2616: method and URI is separated by exactly one space
1997 //urlp = strpbrk(iobuf, " \t"); - no, tab isn't allowed
1998 urlp = strchr(iobuf, ' ');
2000 send_headers_and_exit(HTTP_BAD_REQUEST);
2002 #if ENABLE_FEATURE_HTTPD_CGI
2003 prequest = request_GET;
2004 if (strcasecmp(iobuf, prequest) != 0) {
2005 prequest = request_HEAD;
2006 if (strcasecmp(iobuf, prequest) != 0) {
2008 if (strcasecmp(iobuf, prequest) != 0)
2009 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2013 if (strcasecmp(iobuf, request_GET) != 0)
2014 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2016 // rfc2616: method and URI is separated by exactly one space
2017 //urlp = skip_whitespace(urlp); - should not be necessary
2019 send_headers_and_exit(HTTP_BAD_REQUEST);
2021 /* Find end of URL and parse HTTP version, if any */
2022 http_major_version = '0';
2023 IF_FEATURE_HTTPD_PROXY(http_minor_version = '0';)
2024 tptr = strchrnul(urlp, ' ');
2025 /* Is it " HTTP/"? */
2026 if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) {
2027 http_major_version = tptr[6];
2028 IF_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];)
2032 /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
2033 urlcopy = alloca((tptr - urlp) + 2 + strlen(index_page));
2034 /*if (urlcopy == NULL)
2035 * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
2036 strcpy(urlcopy, urlp);
2037 /* NB: urlcopy ptr is never changed after this */
2039 /* Extract url args if present */
2040 /* g_query = NULL; - already is */
2041 tptr = strchr(urlcopy, '?');
2047 /* Decode URL escape sequences */
2048 tptr = percent_decode_in_place(urlcopy, /*strict:*/ 1);
2050 send_headers_and_exit(HTTP_BAD_REQUEST);
2051 if (tptr == urlcopy + 1) {
2052 /* '/' or NUL is encoded */
2053 send_headers_and_exit(HTTP_NOT_FOUND);
2056 /* Canonicalize path */
2057 /* Algorithm stolen from libbb bb_simplify_path(),
2058 * but don't strdup, retain trailing slash, protect root */
2059 urlp = tptr = urlcopy;
2062 /* skip duplicate (or initial) slash */
2067 if (tptr[1] == '.' && (tptr[2] == '/' || tptr[2] == '\0')) {
2068 /* "..": be careful */
2070 if (urlp == urlcopy)
2071 send_headers_and_exit(HTTP_BAD_REQUEST);
2072 /* omit previous dir */
2073 while (*--urlp != '/')
2075 /* skip to "./" or ".<NUL>" */
2078 if (tptr[1] == '/' || tptr[1] == '\0') {
2079 /* skip extra "/./" */
2091 /* If URL is a directory, add '/' */
2092 if (urlp[-1] != '/') {
2093 if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) {
2094 found_moved_temporarily = urlcopy;
2100 bb_error_msg("url:%s", urlcopy);
2103 ip_allowed = checkPermIP();
2104 while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
2105 /* have path1/path2 */
2107 if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) {
2108 /* may have subdir config */
2109 parse_conf(urlcopy + 1, SUBDIR_PARSE);
2110 ip_allowed = checkPermIP();
2115 #if ENABLE_FEATURE_HTTPD_PROXY
2116 proxy_entry = find_proxy_entry(urlcopy);
2118 header_buf = header_ptr = xmalloc(IOBUF_SIZE);
2121 if (http_major_version >= '0') {
2122 /* Request was with "... HTTP/nXXX", and n >= 0 */
2124 /* Read until blank line */
2127 break; /* EOF or error or empty line */
2129 bb_error_msg("header: '%s'", iobuf);
2131 #if ENABLE_FEATURE_HTTPD_PROXY
2132 /* We need 2 more bytes for yet another "\r\n" -
2133 * see near fdprintf(proxy_fd...) further below */
2134 if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) {
2135 int len = strlen(iobuf);
2136 if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4)
2137 len = IOBUF_SIZE - (header_ptr - header_buf) - 4;
2138 memcpy(header_ptr, iobuf, len);
2140 header_ptr[0] = '\r';
2141 header_ptr[1] = '\n';
2146 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
2147 /* Try and do our best to parse more lines */
2148 if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
2149 /* extra read only for POST */
2150 if (prequest != request_GET
2151 # if ENABLE_FEATURE_HTTPD_CGI
2152 && prequest != request_HEAD
2155 tptr = skip_whitespace(iobuf + sizeof("Content-length:") - 1);
2157 send_headers_and_exit(HTTP_BAD_REQUEST);
2158 /* not using strtoul: it ignores leading minus! */
2159 length = bb_strtou(tptr, NULL, 10);
2160 /* length is "ulong", but we need to pass it to int later */
2161 if (errno || length > INT_MAX)
2162 send_headers_and_exit(HTTP_BAD_REQUEST);
2166 #if ENABLE_FEATURE_HTTPD_CGI
2167 else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
2168 cookie = xstrdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
2169 } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
2170 content_type = xstrdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
2171 } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
2172 referer = xstrdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
2173 } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
2174 user_agent = xstrdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
2175 } else if (STRNCASECMP(iobuf, "Host:") == 0) {
2176 host = xstrdup(skip_whitespace(iobuf + sizeof("Host:")-1));
2177 } else if (STRNCASECMP(iobuf, "Accept:") == 0) {
2178 http_accept = xstrdup(skip_whitespace(iobuf + sizeof("Accept:")-1));
2179 } else if (STRNCASECMP(iobuf, "Accept-Language:") == 0) {
2180 http_accept_language = xstrdup(skip_whitespace(iobuf + sizeof("Accept-Language:")-1));
2183 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2184 if (STRNCASECMP(iobuf, "Authorization:") == 0) {
2185 /* We only allow Basic credentials.
2186 * It shows up as "Authorization: Basic <user>:<passwd>" where
2187 * "<user>:<passwd>" is base64 encoded.
2189 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
2190 if (STRNCASECMP(tptr, "Basic") != 0)
2192 tptr += sizeof("Basic")-1;
2193 /* decodeBase64() skips whitespace itself */
2195 authorized = check_user_passwd(urlcopy, tptr);
2198 #if ENABLE_FEATURE_HTTPD_RANGES
2199 if (STRNCASECMP(iobuf, "Range:") == 0) {
2200 /* We know only bytes=NNN-[MMM] */
2201 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
2202 if (is_prefixed_with(s, "bytes=") == 0) {
2203 s += sizeof("bytes=")-1;
2204 range_start = BB_STRTOOFF(s, &s, 10);
2205 if (s[0] != '-' || range_start < 0) {
2208 range_end = BB_STRTOOFF(s+1, NULL, 10);
2209 if (errno || range_end < range_start)
2215 #if ENABLE_FEATURE_HTTPD_GZIP
2216 if (STRNCASECMP(iobuf, "Accept-Encoding:") == 0) {
2217 /* Note: we do not support "gzip;q=0"
2218 * method of _disabling_ gzip
2219 * delivery. No one uses that, though */
2220 const char *s = strstr(iobuf, "gzip");
2222 // want more thorough checks?
2232 } /* while extra header reading */
2235 /* We are done reading headers, disable peer timeout */
2238 if (strcmp(bb_basename(urlcopy), HTTPD_CONF) == 0 || !ip_allowed) {
2239 /* protect listing [/path]/httpd.conf or IP deny */
2240 send_headers_and_exit(HTTP_FORBIDDEN);
2243 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2244 /* Case: no "Authorization:" was seen, but page might require passwd.
2245 * Check that with dummy user:pass */
2247 authorized = check_user_passwd(urlcopy, (char *) "");
2249 send_headers_and_exit(HTTP_UNAUTHORIZED);
2252 if (found_moved_temporarily) {
2253 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
2256 #if ENABLE_FEATURE_HTTPD_PROXY
2257 if (proxy_entry != NULL) {
2259 len_and_sockaddr *lsa;
2261 proxy_fd = socket(AF_INET, SOCK_STREAM, 0);
2263 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2264 lsa = host2sockaddr(proxy_entry->host_port, 80);
2266 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2267 if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0)
2268 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2269 fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n",
2270 prequest, /* GET or POST */
2271 proxy_entry->url_to, /* url part 1 */
2272 urlcopy + strlen(proxy_entry->url_from), /* url part 2 */
2273 (g_query ? "?" : ""), /* "?" (maybe) */
2274 (g_query ? g_query : ""), /* query string (maybe) */
2275 http_major_version, http_minor_version);
2276 header_ptr[0] = '\r';
2277 header_ptr[1] = '\n';
2279 write(proxy_fd, header_buf, header_ptr - header_buf);
2280 free(header_buf); /* on the order of 8k, free it */
2281 cgi_io_loop_and_exit(proxy_fd, proxy_fd, length);
2285 tptr = urlcopy + 1; /* skip first '/' */
2287 #if ENABLE_FEATURE_HTTPD_CGI
2288 if (is_prefixed_with(tptr, "cgi-bin/")) {
2289 if (tptr[8] == '\0') {
2290 /* protect listing "cgi-bin/" */
2291 send_headers_and_exit(HTTP_FORBIDDEN);
2293 send_cgi_and_exit(urlcopy, urlcopy, prequest, length, cookie, content_type);
2297 if (urlp[-1] == '/') {
2298 /* When index_page string is appended to <dir>/ URL, it overwrites
2299 * the query string. If we fall back to call /cgi-bin/index.cgi,
2300 * query string would be lost and not available to the CGI.
2301 * Work around it by making a deep copy.
2303 if (ENABLE_FEATURE_HTTPD_CGI)
2304 g_query = xstrdup(g_query); /* ok for NULL too */
2305 strcpy(urlp, index_page);
2307 if (stat(tptr, &sb) == 0) {
2308 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
2309 char *suffix = strrchr(tptr, '.');
2312 for (cur = script_i; cur; cur = cur->next) {
2313 if (strcmp(cur->before_colon + 1, suffix) == 0) {
2314 send_cgi_and_exit(urlcopy, urlcopy, prequest, length, cookie, content_type);
2319 file_size = sb.st_size;
2320 last_mod = sb.st_mtime;
2322 #if ENABLE_FEATURE_HTTPD_CGI
2323 else if (urlp[-1] == '/') {
2324 /* It's a dir URL and there is no index.html
2325 * Try cgi-bin/index.cgi */
2326 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
2327 urlp[0] = '\0'; /* remove index_page */
2328 send_cgi_and_exit("/cgi-bin/index.cgi", urlcopy, prequest, length, cookie, content_type);
2331 /* else fall through to send_file, it errors out if open fails: */
2333 if (prequest != request_GET && prequest != request_HEAD) {
2334 /* POST for files does not make sense */
2335 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2337 send_file_and_exit(tptr,
2338 (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS)
2341 send_file_and_exit(tptr, SEND_HEADERS_AND_BODY);
2346 * The main http server function.
2347 * Given a socket, listen for new connections and farm out
2348 * the processing as a [v]forked process.
2352 static void mini_httpd(int server_socket) NORETURN;
2353 static void mini_httpd(int server_socket)
2355 /* NB: it's best to not use xfuncs in this loop before fork().
2356 * Otherwise server may die on transient errors (temporary
2357 * out-of-memory condition, etc), which is Bad(tm).
2358 * Try to do any dangerous calls after fork.
2362 len_and_sockaddr fromAddr;
2364 /* Wait for connections... */
2365 fromAddr.len = LSA_SIZEOF_SA;
2366 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2370 /* set the KEEPALIVE option to cull dead connections */
2371 setsockopt_keepalive(n);
2375 /* Do not reload config on HUP */
2376 signal(SIGHUP, SIG_IGN);
2377 close(server_socket);
2381 handle_incoming_and_exit(&fromAddr);
2383 /* parent, or fork failed */
2389 static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN;
2390 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2392 char *argv_copy[argc + 2];
2394 argv_copy[0] = argv[0];
2395 argv_copy[1] = (char*)"-i";
2396 memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2398 /* NB: it's best to not use xfuncs in this loop before vfork().
2399 * Otherwise server may die on transient errors (temporary
2400 * out-of-memory condition, etc), which is Bad(tm).
2401 * Try to do any dangerous calls after fork.
2405 len_and_sockaddr fromAddr;
2407 /* Wait for connections... */
2408 fromAddr.len = LSA_SIZEOF_SA;
2409 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2413 /* set the KEEPALIVE option to cull dead connections */
2414 setsockopt_keepalive(n);
2418 /* Do not reload config on HUP */
2419 signal(SIGHUP, SIG_IGN);
2420 close(server_socket);
2424 /* Run a copy of ourself in inetd mode */
2427 argv_copy[0][0] &= 0x7f;
2428 /* parent, or vfork failed */
2436 * Process a HTTP connection on stdin/out.
2439 static void mini_httpd_inetd(void) NORETURN;
2440 static void mini_httpd_inetd(void)
2442 len_and_sockaddr fromAddr;
2444 memset(&fromAddr, 0, sizeof(fromAddr));
2445 fromAddr.len = LSA_SIZEOF_SA;
2446 /* NB: can fail if user runs it by hand and types in http cmds */
2447 getpeername(0, &fromAddr.u.sa, &fromAddr.len);
2448 handle_incoming_and_exit(&fromAddr);
2451 static void sighup_handler(int sig UNUSED_PARAM)
2453 parse_conf(DEFAULT_PATH_HTTPD_CONF, SIGNALED_PARSE);
2457 c_opt_config_file = 0,
2460 IF_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2461 IF_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,)
2462 IF_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,)
2463 IF_FEATURE_HTTPD_SETUID( u_opt_setuid ,)
2468 OPT_CONFIG_FILE = 1 << c_opt_config_file,
2469 OPT_DECODE_URL = 1 << d_opt_decode_url,
2470 OPT_HOME_HTTPD = 1 << h_opt_home_httpd,
2471 OPT_ENCODE_URL = IF_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2472 OPT_REALM = IF_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0,
2473 OPT_MD5 = IF_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0,
2474 OPT_SETUID = IF_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0,
2475 OPT_PORT = 1 << p_opt_port,
2476 OPT_INETD = 1 << p_opt_inetd,
2477 OPT_FOREGROUND = 1 << p_opt_foreground,
2478 OPT_VERBOSE = 1 << p_opt_verbose,
2482 int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2483 int httpd_main(int argc UNUSED_PARAM, char **argv)
2485 int server_socket = server_socket; /* for gcc */
2487 char *url_for_decode;
2488 IF_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2489 IF_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2490 IF_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2491 IF_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2495 #if ENABLE_LOCALE_SUPPORT
2496 /* Undo busybox.c: we want to speak English in http (dates etc) */
2497 setlocale(LC_TIME, "C");
2500 home_httpd = xrealloc_getcwd_or_warn(NULL);
2501 /* -v counts, -i implies -f */
2502 opt_complementary = "vv:if";
2503 /* We do not "absolutize" path given by -h (home) opt.
2504 * If user gives relative path in -h,
2505 * $SCRIPT_FILENAME will not be set. */
2506 opt = getopt32(argv, "c:d:h:"
2507 IF_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2508 IF_FEATURE_HTTPD_BASIC_AUTH("r:")
2509 IF_FEATURE_HTTPD_AUTH_MD5("m:")
2510 IF_FEATURE_HTTPD_SETUID("u:")
2512 &opt_c_configFile, &url_for_decode, &home_httpd
2513 IF_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2514 IF_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2515 IF_FEATURE_HTTPD_AUTH_MD5(, &pass)
2516 IF_FEATURE_HTTPD_SETUID(, &s_ugid)
2517 , &bind_addr_or_port
2520 if (opt & OPT_DECODE_URL) {
2521 fputs(percent_decode_in_place(url_for_decode, /*strict:*/ 0), stdout);
2524 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2525 if (opt & OPT_ENCODE_URL) {
2526 fputs(encodeString(url_for_encode), stdout);
2530 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2531 if (opt & OPT_MD5) {
2532 char salt[sizeof("$1$XXXXXXXX")];
2536 crypt_make_salt(salt + 3, 4);
2537 puts(pw_encrypt(pass, salt, /*cleanup:*/ 0));
2541 #if ENABLE_FEATURE_HTTPD_SETUID
2542 if (opt & OPT_SETUID) {
2543 xget_uidgid(&ugid, s_ugid);
2548 if (!(opt & OPT_FOREGROUND)) {
2549 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2554 if (!(opt & OPT_INETD)) {
2555 signal(SIGCHLD, SIG_IGN);
2556 server_socket = openServer();
2557 #if ENABLE_FEATURE_HTTPD_SETUID
2558 /* drop privileges */
2559 if (opt & OPT_SETUID) {
2560 if (ugid.gid != (gid_t)-1) {
2561 if (setgroups(1, &ugid.gid) == -1)
2562 bb_perror_msg_and_die("setgroups");
2571 /* User can do it himself: 'env - PATH="$PATH" httpd'
2572 * We don't do it because we don't want to screw users
2574 * 'env - VAR1=val1 VAR2=val2 httpd'
2575 * and have VAR1 and VAR2 values visible in their CGIs.
2576 * Besides, it is also smaller. */
2578 char *p = getenv("PATH");
2579 /* env strings themself are not freed, no need to xstrdup(p): */
2583 // if (!(opt & OPT_INETD))
2584 // setenv_long("SERVER_PORT", ???);
2588 parse_conf(DEFAULT_PATH_HTTPD_CONF, FIRST_PARSE);
2589 if (!(opt & OPT_INETD))
2590 signal(SIGHUP, sighup_handler);
2592 xfunc_error_retval = 0;
2593 if (opt & OPT_INETD)
2596 if (!(opt & OPT_FOREGROUND))
2597 bb_daemonize(0); /* don't change current directory */
2598 mini_httpd(server_socket); /* never returns */
2600 mini_httpd_nommu(server_socket, argc, argv); /* never returns */