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() */
101 //config:config HTTPD
102 //config: bool "httpd (32 kb)"
105 //config: HTTP server.
107 //config:config FEATURE_HTTPD_RANGES
108 //config: bool "Support 'Ranges:' header"
110 //config: depends on HTTPD
112 //config: Makes httpd emit "Accept-Ranges: bytes" header and understand
113 //config: "Range: bytes=NNN-[MMM]" header. Allows for resuming interrupted
114 //config: downloads, seeking in multimedia players etc.
116 //config:config FEATURE_HTTPD_SETUID
117 //config: bool "Enable -u <user> option"
119 //config: depends on HTTPD
121 //config: This option allows the server to run as a specific user
122 //config: rather than defaulting to the user that starts the server.
123 //config: Use of this option requires special privileges to change to a
124 //config: different user.
126 //config:config FEATURE_HTTPD_BASIC_AUTH
127 //config: bool "Enable HTTP authentication"
129 //config: depends on HTTPD
131 //config: Utilizes password settings from /etc/httpd.conf for basic
132 //config: authentication on a per url basis.
133 //config: Example for httpd.conf file:
134 //config: /adm:toor:PaSsWd
136 //config:config FEATURE_HTTPD_AUTH_MD5
137 //config: bool "Support MD5-encrypted passwords in HTTP authentication"
139 //config: depends on FEATURE_HTTPD_BASIC_AUTH
141 //config: Enables encrypted passwords, and wildcard user/passwords
142 //config: in httpd.conf file.
143 //config: User '*' means 'any system user name is ok',
144 //config: password of '*' means 'use system password for this user'
146 //config: /adm:toor:$1$P/eKnWXS$aI1aPGxT.dJD5SzqAKWrF0
147 //config: /adm:root:*
150 //config:config FEATURE_HTTPD_CGI
151 //config: bool "Support Common Gateway Interface (CGI)"
153 //config: depends on HTTPD
155 //config: This option allows scripts and executables to be invoked
156 //config: when specific URLs are requested.
158 //config:config FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
159 //config: bool "Support running scripts through an interpreter"
161 //config: depends on FEATURE_HTTPD_CGI
163 //config: This option enables support for running scripts through an
164 //config: interpreter. Turn this on if you want PHP scripts to work
165 //config: properly. You need to supply an additional line in your
166 //config: httpd.conf file:
167 //config: *.php:/path/to/your/php
169 //config:config FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
170 //config: bool "Set REMOTE_PORT environment variable for CGI"
172 //config: depends on FEATURE_HTTPD_CGI
174 //config: Use of this option can assist scripts in generating
175 //config: references that contain a unique port number.
177 //config:config FEATURE_HTTPD_ENCODE_URL_STR
178 //config: bool "Enable -e option (useful for CGIs written as shell scripts)"
180 //config: depends on HTTPD
182 //config: This option allows html encoding of arbitrary strings for display
183 //config: by the browser. Output goes to stdout.
184 //config: For example, httpd -e "<Hello World>" produces
185 //config: "<Hello World>".
187 //config:config FEATURE_HTTPD_ERROR_PAGES
188 //config: bool "Support custom error pages"
190 //config: depends on HTTPD
192 //config: This option allows you to define custom error pages in
193 //config: the configuration file instead of the default HTTP status
194 //config: error pages. For instance, if you add the line:
195 //config: E404:/path/e404.html
196 //config: in the config file, the server will respond the specified
197 //config: '/path/e404.html' file instead of the terse '404 NOT FOUND'
200 //config:config FEATURE_HTTPD_PROXY
201 //config: bool "Support reverse proxy"
203 //config: depends on HTTPD
205 //config: This option allows you to define URLs that will be forwarded
206 //config: to another HTTP server. To setup add the following line to the
207 //config: configuration file
208 //config: P:/url/:http://hostname[:port]/new/path/
209 //config: Then a request to /url/myfile will be forwarded to
210 //config: http://hostname[:port]/new/path/myfile.
212 //config:config FEATURE_HTTPD_GZIP
213 //config: bool "Support GZIP content encoding"
215 //config: depends on HTTPD
217 //config: Makes httpd send files using GZIP content encoding if the
218 //config: client supports it and a pre-compressed <file>.gz exists.
220 //applet:IF_HTTPD(APPLET(httpd, BB_DIR_USR_SBIN, BB_SUID_DROP))
222 //kbuild:lib-$(CONFIG_HTTPD) += httpd.o
224 //usage:#define httpd_trivial_usage
226 //usage: " [-c CONFFILE]"
227 //usage: " [-p [IP:]PORT]"
228 //usage: IF_FEATURE_HTTPD_SETUID(" [-u USER[:GRP]]")
229 //usage: IF_FEATURE_HTTPD_BASIC_AUTH(" [-r REALM]")
230 //usage: " [-h HOME]\n"
231 //usage: "or httpd -d/-e" IF_FEATURE_HTTPD_AUTH_MD5("/-m") " STRING"
232 //usage:#define httpd_full_usage "\n\n"
233 //usage: "Listen for incoming HTTP requests\n"
234 //usage: "\n -i Inetd mode"
235 //usage: "\n -f Don't daemonize"
236 //usage: "\n -v[v] Verbose"
237 //usage: "\n -p [IP:]PORT Bind to IP:PORT (default *:80)"
238 //usage: IF_FEATURE_HTTPD_SETUID(
239 //usage: "\n -u USER[:GRP] Set uid/gid after binding to port")
240 //usage: IF_FEATURE_HTTPD_BASIC_AUTH(
241 //usage: "\n -r REALM Authentication Realm for Basic Authentication")
242 //usage: "\n -h HOME Home directory (default .)"
243 //usage: "\n -c FILE Configuration file (default {/etc,HOME}/httpd.conf)"
244 //usage: IF_FEATURE_HTTPD_AUTH_MD5(
245 //usage: "\n -m STRING MD5 crypt STRING")
246 //usage: "\n -e STRING HTML encode STRING"
247 //usage: "\n -d STRING URL decode STRING"
250 #include "common_bufsiz.h"
252 /* PAM may include <locale.h>. We may need to undefine bbox's stub define: */
254 /* For some obscure reason, PAM is not in pam/xxx, but in security/xxx.
255 * Apparently they like to confuse people. */
256 # include <security/pam_appl.h>
257 # include <security/pam_misc.h>
259 #if ENABLE_FEATURE_USE_SENDFILE
260 # include <sys/sendfile.h>
262 /* amount of buffering in a pipe */
264 # define PIPE_BUF 4096
269 #define IOBUF_SIZE 8192
270 #if PIPE_BUF >= IOBUF_SIZE
271 # error "PIPE_BUF >= IOBUF_SIZE"
274 #define HEADER_READ_TIMEOUT 60
276 static const char DEFAULT_PATH_HTTPD_CONF[] ALIGN1 = "/etc";
277 static const char HTTPD_CONF[] ALIGN1 = "httpd.conf";
278 static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
279 static const char index_html[] ALIGN1 = "index.html";
281 typedef struct has_next_ptr {
282 struct has_next_ptr *next;
285 /* Must have "next" as a first member */
286 typedef struct Htaccess {
287 struct Htaccess *next;
289 char before_colon[1]; /* really bigger, must be last */
292 /* Must have "next" as a first member */
293 typedef struct Htaccess_IP {
294 struct Htaccess_IP *next;
300 /* Must have "next" as a first member */
301 typedef struct Htaccess_Proxy {
302 struct Htaccess_Proxy *next;
310 HTTP_PARTIAL_CONTENT = 206,
311 HTTP_MOVED_TEMPORARILY = 302,
312 HTTP_BAD_REQUEST = 400, /* malformed syntax */
313 HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
314 HTTP_NOT_FOUND = 404,
315 HTTP_FORBIDDEN = 403,
316 HTTP_REQUEST_TIMEOUT = 408,
317 HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */
318 HTTP_INTERNAL_SERVER_ERROR = 500,
320 #if 0 /* future use */
321 HTTP_SWITCHING_PROTOCOLS = 101,
324 HTTP_NON_AUTHORITATIVE_INFO = 203,
325 HTTP_NO_CONTENT = 204,
326 HTTP_MULTIPLE_CHOICES = 300,
327 HTTP_MOVED_PERMANENTLY = 301,
328 HTTP_NOT_MODIFIED = 304,
329 HTTP_PAYMENT_REQUIRED = 402,
330 HTTP_BAD_GATEWAY = 502,
331 HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
335 static const uint16_t http_response_type[] ALIGN2 = {
337 #if ENABLE_FEATURE_HTTPD_RANGES
338 HTTP_PARTIAL_CONTENT,
340 HTTP_MOVED_TEMPORARILY,
341 HTTP_REQUEST_TIMEOUT,
342 HTTP_NOT_IMPLEMENTED,
343 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
349 HTTP_INTERNAL_SERVER_ERROR,
350 #if 0 /* not implemented */
354 HTTP_MULTIPLE_CHOICES,
355 HTTP_MOVED_PERMANENTLY,
358 HTTP_SERVICE_UNAVAILABLE,
362 static const struct {
365 } http_response[ARRAY_SIZE(http_response_type)] = {
367 #if ENABLE_FEATURE_HTTPD_RANGES
368 { "Partial Content", NULL },
371 { "Request Timeout", "No request appeared within 60 seconds" },
372 { "Not Implemented", "The requested method is not recognized" },
373 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
374 { "Unauthorized", "" },
376 { "Not Found", "The requested URL was not found" },
377 { "Bad Request", "Unsupported method" },
379 { "Internal Server Error", "Internal Server Error" },
380 #if 0 /* not implemented */
384 { "Multiple Choices" },
385 { "Moved Permanently" },
387 { "Bad Gateway", "" },
388 { "Service Unavailable", "" },
393 int verbose; /* must be int (used by getopt32) */
394 smallint flg_deny_all;
396 unsigned rmt_ip; /* used for IP-based allow/deny rules */
398 char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */
399 const char *bind_addr_or_port;
402 const char *opt_c_configFile;
403 const char *home_httpd;
404 const char *index_page;
406 const char *found_mime_type;
407 const char *found_moved_temporarily;
408 Htaccess_IP *ip_a_d; /* config allow/deny lines */
410 IF_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
411 IF_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
412 IF_FEATURE_HTTPD_CGI(char *referer;)
413 IF_FEATURE_HTTPD_CGI(char *user_agent;)
414 IF_FEATURE_HTTPD_CGI(char *host;)
415 IF_FEATURE_HTTPD_CGI(char *http_accept;)
416 IF_FEATURE_HTTPD_CGI(char *http_accept_language;)
418 off_t file_size; /* -1 - unknown */
419 #if ENABLE_FEATURE_HTTPD_RANGES
425 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
426 Htaccess *g_auth; /* config user:password lines */
428 Htaccess *mime_a; /* config mime types */
429 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
430 Htaccess *script_i; /* config script interpreters */
432 char *iobuf; /* [IOBUF_SIZE] */
433 #define hdr_buf bb_common_bufsiz1
434 #define sizeof_hdr_buf COMMON_BUFSIZE
437 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
438 const char *http_error_page[ARRAY_SIZE(http_response_type)];
440 #if ENABLE_FEATURE_HTTPD_PROXY
441 Htaccess_Proxy *proxy;
443 #if ENABLE_FEATURE_HTTPD_GZIP
444 /* client can handle gzip / we are going to send gzip */
445 smallint content_gzip;
448 #define G (*ptr_to_globals)
449 #define verbose (G.verbose )
450 #define flg_deny_all (G.flg_deny_all )
451 #define rmt_ip (G.rmt_ip )
452 #define bind_addr_or_port (G.bind_addr_or_port)
453 #define g_query (G.g_query )
454 #define opt_c_configFile (G.opt_c_configFile )
455 #define home_httpd (G.home_httpd )
456 #define index_page (G.index_page )
457 #define found_mime_type (G.found_mime_type )
458 #define found_moved_temporarily (G.found_moved_temporarily)
459 #define last_mod (G.last_mod )
460 #define ip_a_d (G.ip_a_d )
461 #define g_realm (G.g_realm )
462 #define remoteuser (G.remoteuser )
463 #define file_size (G.file_size )
464 #if ENABLE_FEATURE_HTTPD_RANGES
465 #define range_start (G.range_start )
466 #define range_end (G.range_end )
467 #define range_len (G.range_len )
471 range_end = MAXINT(off_t) - 1,
472 range_len = MAXINT(off_t),
475 #define rmt_ip_str (G.rmt_ip_str )
476 #define g_auth (G.g_auth )
477 #define mime_a (G.mime_a )
478 #define script_i (G.script_i )
479 #define iobuf (G.iobuf )
480 #define hdr_ptr (G.hdr_ptr )
481 #define hdr_cnt (G.hdr_cnt )
482 #define http_error_page (G.http_error_page )
483 #define proxy (G.proxy )
484 #if ENABLE_FEATURE_HTTPD_GZIP
485 # define content_gzip (G.content_gzip )
487 # define content_gzip 0
489 #define INIT_G() do { \
490 setup_common_bufsiz(); \
491 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
492 IF_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
493 IF_FEATURE_HTTPD_RANGES(range_start = -1;) \
494 bind_addr_or_port = "80"; \
495 index_page = index_html; \
500 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
504 SEND_HEADERS = (1 << 0),
505 SEND_BODY = (1 << 1),
506 SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY,
508 static void send_file_and_exit(const char *url, int what) NORETURN;
510 static void free_llist(has_next_ptr **pptr)
512 has_next_ptr *cur = *pptr;
514 has_next_ptr *t = cur;
521 static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
523 free_llist((has_next_ptr**)pptr);
526 static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
528 free_llist((has_next_ptr**)pptr);
531 /* Returns presumed mask width in bits or < 0 on error.
532 * Updates strp, stores IP at provided pointer */
533 static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
535 const char *p = *strp;
543 for (j = 0; j < 4; j++) {
546 if ((*p < '0' || *p > '9') && *p != '/' && *p)
549 while (*p >= '0' && *p <= '9') {
560 ip = (ip << 8) | octet;
574 /* Returns 0 on success. Stores IP and mask at provided pointers */
575 static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
581 i = scan_ip(&str, ipp, '/');
586 /* there is /xxx after dotted-IP address */
587 i = bb_strtou(str, &p, 10);
589 /* 'xxx' itself is dotted-IP mask, parse it */
590 /* (return 0 (success) only if it has N.N.N.N form) */
591 return scan_ip(&str, maskp, '\0') - 32;
600 if (sizeof(unsigned) == 4 && i == 32) {
601 /* mask >>= 32 below may not work */
607 /* i == 0 -> *maskp = 0x00000000
608 * i == 1 -> *maskp = 0x80000000
609 * i == 4 -> *maskp = 0xf0000000
610 * i == 31 -> *maskp = 0xfffffffe
611 * i == 32 -> *maskp = 0xffffffff */
612 *maskp = (uint32_t)(~mask);
617 * Parse configuration file into in-memory linked list.
619 * Any previous IP rules are discarded.
620 * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
621 * are also discarded. That is, previous settings are retained if flag is
623 * Error pages are only parsed on the main config file.
625 * path Path where to look for httpd.conf (without filename).
626 * flag Type of the parse request.
630 FIRST_PARSE = 0, /* path will be "/etc" */
631 SIGNALED_PARSE = 1, /* path will be "/etc" */
632 SUBDIR_PARSE = 2, /* path will be derived from URL */
634 static void parse_conf(const char *path, int flag)
636 /* internally used extra flag state */
637 enum { TRY_CURDIR_PARSE = 3 };
640 const char *filename;
643 /* discard old rules */
644 free_Htaccess_IP_list(&ip_a_d);
646 /* retain previous auth and mime config only for subdir parse */
647 if (flag != SUBDIR_PARSE) {
648 free_Htaccess_list(&mime_a);
649 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
650 free_Htaccess_list(&g_auth);
652 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
653 free_Htaccess_list(&script_i);
657 filename = opt_c_configFile;
658 if (flag == SUBDIR_PARSE || filename == NULL) {
659 filename = alloca(strlen(path) + sizeof(HTTPD_CONF) + 2);
660 sprintf((char *)filename, "%s/%s", path, HTTPD_CONF);
663 while ((f = fopen_for_read(filename)) == NULL) {
664 if (flag >= SUBDIR_PARSE) { /* SUBDIR or TRY_CURDIR */
665 /* config file not found, no changes to config */
668 if (flag == FIRST_PARSE) {
669 /* -c CONFFILE given, but CONFFILE doesn't exist? */
670 if (opt_c_configFile)
671 bb_simple_perror_msg_and_die(opt_c_configFile);
672 /* else: no -c, thus we looked at /etc/httpd.conf,
673 * and it's not there. try ./httpd.conf: */
675 flag = TRY_CURDIR_PARSE;
676 filename = HTTPD_CONF;
679 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
680 /* in "/file:user:pass" lines, we prepend path in subdirs */
681 if (flag != SUBDIR_PARSE)
686 * I:default_index_file
688 * [AD]:IP[/mask] # allow/deny, * for wildcard
689 * Ennn:error.html # error page for status nnn
690 * P:/url:[http://]hostname[:port]/new/path # reverse proxy
691 * .ext:mime/type # mime type
692 * *.php:/path/php # run xxx.php through an interpreter
693 * /file:user:pass # username and password
695 while (fgets(buf, sizeof(buf), f) != NULL) {
700 { /* remove all whitespace, and # comments */
704 /* skip non-whitespace beginning. Often the whole line
705 * is non-whitespace. We want this case to work fast,
706 * without needless copying, therefore we don't merge
707 * this operation into next while loop. */
708 while ((ch = *p0) != '\0' && ch != '\n' && ch != '#'
709 && ch != ' ' && ch != '\t'
714 /* if we enter this loop, we have some whitespace.
716 while (ch != '\0' && ch != '\n' && ch != '#') {
717 if (ch != ' ' && ch != '\t') {
723 strlen_buf = p - buf;
725 continue; /* empty line */
728 after_colon = strchr(buf, ':');
730 if (after_colon == NULL || *++after_colon == '\0')
733 ch = (buf[0] & ~0x20); /* toupper if it's a letter */
736 if (index_page != index_html)
737 free((char*)index_page);
738 index_page = xstrdup(after_colon);
742 /* do not allow jumping around using H in subdir's configs */
743 if (flag == FIRST_PARSE && ch == 'H') {
744 home_httpd = xstrdup(after_colon);
749 if (ch == 'A' || ch == 'D') {
752 if (*after_colon == '*') {
754 /* memorize "deny all" */
757 /* skip assumed "A:*", it is a default anyway */
760 /* store "allow/deny IP/mask" line */
761 pip = xzalloc(sizeof(*pip));
762 if (scan_ip_mask(after_colon, &pip->ip, &pip->mask)) {
763 /* IP{/mask} syntax error detected, protect all */
767 pip->allow_deny = ch;
769 /* Deny:from_IP - prepend */
773 /* A:from_IP - append (thus all D's precedes A's) */
774 Htaccess_IP *prev_IP = ip_a_d;
775 if (prev_IP == NULL) {
778 while (prev_IP->next)
779 prev_IP = prev_IP->next;
786 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
787 if (flag == FIRST_PARSE && ch == 'E') {
789 int status = atoi(buf + 1); /* error status code */
791 if (status < HTTP_CONTINUE) {
794 /* then error page; find matching status */
795 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
796 if (http_response_type[i] == status) {
797 /* We chdir to home_httpd, thus no need to
798 * concat_path_file(home_httpd, after_colon)
800 http_error_page[i] = xstrdup(after_colon);
808 #if ENABLE_FEATURE_HTTPD_PROXY
809 if (flag == FIRST_PARSE && ch == 'P') {
810 /* P:/url:[http://]hostname[:port]/new/path */
811 char *url_from, *host_port, *url_to;
812 Htaccess_Proxy *proxy_entry;
814 url_from = after_colon;
815 host_port = strchr(after_colon, ':');
816 if (host_port == NULL) {
820 if (is_prefixed_with(host_port, "http://"))
822 if (*host_port == '\0') {
825 url_to = strchr(host_port, '/');
826 if (url_to == NULL) {
830 proxy_entry = xzalloc(sizeof(*proxy_entry));
831 proxy_entry->url_from = xstrdup(url_from);
832 proxy_entry->host_port = xstrdup(host_port);
834 proxy_entry->url_to = xstrdup(url_to);
835 proxy_entry->next = proxy;
840 /* the rest of directives are non-alphabetic,
841 * must avoid using "toupper'ed" ch */
844 if (ch == '.' /* ".ext:mime/type" */
845 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
846 || (ch == '*' && buf[1] == '.') /* "*.php:/path/php" */
852 cur = xzalloc(sizeof(*cur) /* includes space for NUL */ + strlen_buf);
853 strcpy(cur->before_colon, buf);
854 p = cur->before_colon + (after_colon - buf);
856 cur->after_colon = p;
858 /* .mime line: prepend to mime_a list */
862 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
864 /* script interpreter line: prepend to script_i list */
865 cur->next = script_i;
872 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
873 if (ch == '/') { /* "/file:user:pass" */
878 /* note: path is "" unless we are in SUBDIR parse,
879 * otherwise it does NOT start with "/" */
880 cur = xzalloc(sizeof(*cur) /* includes space for NUL */
884 /* form "/path/file" */
885 sprintf(cur->before_colon, "/%s%.*s",
887 (int) (after_colon - buf - 1), /* includes "/", but not ":" */
889 /* canonicalize it */
890 p = bb_simplify_abs_path_inplace(cur->before_colon);
891 file_len = p - cur->before_colon;
892 /* add "user:pass" after NUL */
893 strcpy(++p, after_colon);
894 cur->after_colon = p;
896 /* insert cur into g_auth */
897 /* g_auth is sorted by decreased filename length */
899 Htaccess *auth, **authp;
902 while ((auth = *authp) != NULL) {
903 if (file_len >= strlen(auth->before_colon)) {
904 /* insert cur before auth */
914 #endif /* BASIC_AUTH */
916 /* the line is not recognized */
918 bb_error_msg("config error '%s' in '%s'", buf, filename);
919 } /* while (fgets) */
924 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
926 * Given a string, html-encode special characters.
927 * This is used for the -e command line option to provide an easy way
928 * for scripts to encode result data without confusing browsers. The
929 * returned string pointer is memory allocated by malloc().
931 * Returns a pointer to the encoded string (malloced).
933 static char *encodeString(const char *string)
935 /* take the simple route and encode everything */
936 /* could possibly scan once to get length. */
937 int len = strlen(string);
938 char *out = xmalloc(len * 6 + 1);
942 while ((ch = *string++) != '\0') {
943 /* very simple check for what to encode */
947 p += sprintf(p, "&#%d;", (unsigned char) ch);
954 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
956 * Decode a base64 data stream as per rfc1521.
957 * Note that the rfc states that non base64 chars are to be ignored.
958 * Since the decode always results in a shorter size than the input,
959 * it is OK to pass the input arg as an output arg.
960 * Parameter: a pointer to a base64 encoded string.
961 * Decoded data is stored in-place.
963 static void decodeBase64(char *Data)
965 const unsigned char *in = (const unsigned char *)Data;
966 /* The decoded size will be at most 3/4 the size of the encoded */
973 if (t >= '0' && t <= '9')
975 else if (t >= 'A' && t <= 'Z')
977 else if (t >= 'a' && t <= 'z')
991 *Data++ = (char) (ch >> 16);
992 *Data++ = (char) (ch >> 8);
1002 * Create a listen server socket on the designated port.
1004 static int openServer(void)
1006 unsigned n = bb_strtou(bind_addr_or_port, NULL, 10);
1007 if (!errno && n && n <= 0xffff)
1008 n = create_and_bind_stream_or_die(NULL, n);
1010 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
1016 * Log the connection closure and exit.
1018 static void log_and_exit(void) NORETURN;
1019 static void log_and_exit(void)
1021 /* Paranoia. IE said to be buggy. It may send some extra data
1022 * or be confused by us just exiting without SHUT_WR. Oh well. */
1023 shutdown(1, SHUT_WR);
1025 (this also messes up stdin when user runs httpd -i from terminal)
1027 while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0)
1032 bb_error_msg("closed");
1033 _exit(xfunc_error_retval);
1037 * Create and send HTTP response headers.
1038 * The arguments are combined and sent as one write operation. Note that
1039 * IE will puke big-time if the headers are not sent in one packet and the
1040 * second packet is delayed for any reason.
1041 * responseNum - the result code to send.
1043 static void send_headers(int responseNum)
1045 static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
1046 /* Fixed size 29-byte string. Example: Sun, 06 Nov 1994 08:49:37 GMT */
1047 char date_str[40]; /* using a bit larger buffer to paranoia reasons */
1049 const char *responseString = "";
1050 const char *infoString = NULL;
1051 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
1052 const char *error_page = NULL;
1055 time_t timer = time(NULL);
1058 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
1059 if (http_response_type[i] == responseNum) {
1060 responseString = http_response[i].name;
1061 infoString = http_response[i].info;
1062 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
1063 error_page = http_error_page[i];
1070 bb_error_msg("response:%u", responseNum);
1072 /* We use sprintf, not snprintf (it's less code).
1073 * iobuf[] is several kbytes long and all headers we generate
1074 * always fit into those kbytes.
1077 strftime(date_str, sizeof(date_str), RFC1123FMT, gmtime(&timer));
1078 len = sprintf(iobuf,
1079 "HTTP/1.0 %d %s\r\n"
1080 "Content-type: %s\r\n"
1082 "Connection: close\r\n",
1083 responseNum, responseString,
1084 /* if it's error message, then it's HTML */
1085 (responseNum == HTTP_OK ? found_mime_type : "text/html"),
1089 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1090 if (responseNum == HTTP_UNAUTHORIZED) {
1091 len += sprintf(iobuf + len,
1092 "WWW-Authenticate: Basic realm=\"%.999s\"\r\n",
1093 g_realm /* %.999s protects from overflowing iobuf[] */
1097 if (responseNum == HTTP_MOVED_TEMPORARILY) {
1098 /* Responding to "GET /dir" with
1099 * "HTTP/1.0 302 Found" "Location: /dir/"
1100 * - IOW, asking them to repeat with a slash.
1101 * Here, overflow IS possible, can't use sprintf:
1103 * python -c 'print("get /test?" + ("x" * 8192))' | busybox httpd -i -h .
1105 len += snprintf(iobuf + len, IOBUF_SIZE-3 - len,
1106 "Location: %s/%s%s\r\n",
1107 found_moved_temporarily,
1108 (g_query ? "?" : ""),
1109 (g_query ? g_query : "")
1111 if (len > IOBUF_SIZE-3)
1115 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
1116 if (error_page && access(error_page, R_OK) == 0) {
1117 iobuf[len++] = '\r';
1118 iobuf[len++] = '\n';
1121 fprintf(stderr, "headers: '%s'\n", iobuf);
1123 full_write(STDOUT_FILENO, iobuf, len);
1125 fprintf(stderr, "writing error page: '%s'\n", error_page);
1126 return send_file_and_exit(error_page, SEND_BODY);
1130 if (file_size != -1) { /* file */
1131 strftime(date_str, sizeof(date_str), RFC1123FMT, gmtime(&last_mod));
1132 #if ENABLE_FEATURE_HTTPD_RANGES
1133 if (responseNum == HTTP_PARTIAL_CONTENT) {
1134 len += sprintf(iobuf + len,
1135 "Content-Range: bytes %"OFF_FMT"u-%"OFF_FMT"u/%"OFF_FMT"u\r\n",
1140 file_size = range_end - range_start + 1;
1143 len += sprintf(iobuf + len,
1144 #if ENABLE_FEATURE_HTTPD_RANGES
1145 "Accept-Ranges: bytes\r\n"
1147 "Last-Modified: %s\r\n"
1148 "%s %"OFF_FMT"u\r\n",
1150 content_gzip ? "Transfer-Length:" : "Content-Length:",
1156 len += sprintf(iobuf + len, "Content-Encoding: gzip\r\n");
1158 iobuf[len++] = '\r';
1159 iobuf[len++] = '\n';
1161 len += sprintf(iobuf + len,
1162 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
1163 "<BODY><H1>%d %s</H1>\n"
1166 responseNum, responseString,
1167 responseNum, responseString,
1173 fprintf(stderr, "headers: '%s'\n", iobuf);
1175 if (full_write(STDOUT_FILENO, iobuf, len) != len) {
1177 bb_perror_msg("error");
1182 static void send_headers_and_exit(int responseNum) NORETURN;
1183 static void send_headers_and_exit(int responseNum)
1185 IF_FEATURE_HTTPD_GZIP(content_gzip = 0;)
1186 send_headers(responseNum);
1191 * Read from the socket until '\n' or EOF. '\r' chars are removed.
1192 * '\n' is replaced with NUL.
1193 * Return number of characters read or 0 if nothing is read
1194 * ('\r' and '\n' are not counted).
1195 * Data is returned in iobuf.
1197 static int get_line(void)
1202 alarm(HEADER_READ_TIMEOUT);
1205 hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof_hdr_buf);
1210 iobuf[count] = c = *hdr_ptr++;
1216 iobuf[count] = '\0';
1219 if (count < (IOBUF_SIZE - 1)) /* check overflow */
1225 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1227 /* gcc 4.2.1 fares better with NOINLINE */
1228 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN;
1229 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1231 enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1232 struct pollfd pfd[3];
1233 int out_cnt; /* we buffer a bit of initial CGI output */
1236 /* iobuf is used for CGI -> network data,
1237 * hdr_buf is for network -> CGI data (POSTDATA) */
1239 /* If CGI dies, we still want to correctly finish reading its output
1240 * and send it to the peer. So please no SIGPIPEs! */
1241 signal(SIGPIPE, SIG_IGN);
1243 // We inconsistently handle a case when more POSTDATA from network
1244 // is coming than we expected. We may give *some part* of that
1245 // extra data to CGI.
1247 //if (hdr_cnt > post_len) {
1248 // /* We got more POSTDATA from network than we expected */
1249 // hdr_cnt = post_len;
1251 post_len -= hdr_cnt;
1252 /* post_len - number of POST bytes not yet read from network */
1254 /* NB: breaking out of this loop jumps to log_and_exit() */
1256 pfd[FROM_CGI].fd = fromCgi_rd;
1257 pfd[FROM_CGI].events = POLLIN;
1258 pfd[TO_CGI].fd = toCgi_wr;
1260 /* Note: even pfd[0].events == 0 won't prevent
1261 * revents == POLLHUP|POLLERR reports from closed stdin.
1262 * Setting fd to -1 works: */
1264 pfd[0].events = POLLIN;
1265 pfd[0].revents = 0; /* probably not needed, paranoia */
1267 /* We always poll this fd, thus kernel always sets revents: */
1268 /*pfd[FROM_CGI].events = POLLIN; - moved out of loop */
1269 /*pfd[FROM_CGI].revents = 0; - not needed */
1271 /* gcc-4.8.0 still doesnt fill two shorts with one insn :( */
1272 /* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47059 */
1273 /* hopefully one day it will... */
1274 pfd[TO_CGI].events = POLLOUT;
1275 pfd[TO_CGI].revents = 0; /* needed! */
1277 if (toCgi_wr && hdr_cnt <= 0) {
1279 /* Expect more POST data from network */
1282 /* post_len <= 0 && hdr_cnt <= 0:
1283 * no more POST data to CGI,
1284 * let CGI see EOF on CGI's stdin */
1285 if (toCgi_wr != fromCgi_rd)
1291 /* Now wait on the set of sockets */
1292 count = safe_poll(pfd, hdr_cnt > 0 ? TO_CGI+1 : FROM_CGI+1, -1);
1295 if (safe_waitpid(pid, &status, WNOHANG) <= 0) {
1296 /* Weird. CGI didn't exit and no fd's
1297 * are ready, yet poll returned?! */
1300 if (DEBUG && WIFEXITED(status))
1301 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1302 if (DEBUG && WIFSIGNALED(status))
1303 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1308 if (pfd[TO_CGI].revents) {
1309 /* hdr_cnt > 0 here due to the way poll() called */
1310 /* Have data from peer and can write to CGI */
1311 count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1312 /* Doesn't happen, we dont use nonblocking IO here
1313 *if (count < 0 && errno == EAGAIN) {
1320 /* EOF/broken pipe to CGI, stop piping POST data */
1321 hdr_cnt = post_len = 0;
1325 if (pfd[0].revents) {
1326 /* post_len > 0 && hdr_cnt == 0 here */
1327 /* We expect data, prev data portion is eaten by CGI
1328 * and there *is* data to read from the peer
1330 //count = post_len > (int)sizeof_hdr_buf ? (int)sizeof_hdr_buf : post_len;
1331 //count = safe_read(STDIN_FILENO, hdr_buf, count);
1332 count = safe_read(STDIN_FILENO, hdr_buf, sizeof_hdr_buf);
1338 /* no more POST data can be read */
1343 if (pfd[FROM_CGI].revents) {
1344 /* There is something to read from CGI */
1347 /* Are we still buffering CGI output? */
1349 /* HTTP_200[] has single "\r\n" at the end.
1350 * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1351 * CGI scripts MUST send their own header terminated by
1352 * empty line, then data. That's why we have only one
1353 * <cr><lf> pair here. We will output "200 OK" line
1354 * if needed, but CGI still has to provide blank line
1355 * between header and body */
1357 /* Must use safe_read, not full_read, because
1358 * CGI may output a few first bytes and then wait
1359 * for POSTDATA without closing stdout.
1360 * With full_read we may wait here forever. */
1361 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1363 /* eof (or error) and there was no "HTTP",
1364 * so write it, then write received data */
1366 full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1);
1367 full_write(STDOUT_FILENO, rbuf, out_cnt);
1369 break; /* CGI stdout is closed, exiting */
1373 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1374 if (out_cnt >= 7 && memcmp(rbuf, "Status:", 7) == 0) {
1375 /* send "HTTP/1.0 " */
1376 if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9)
1378 rbuf += 7; /* skip "Status:" */
1379 count = out_cnt - 7;
1380 out_cnt = -1; /* buffering off */
1381 } else if (out_cnt >= 4) {
1382 /* Did CGI add "HTTP"? */
1383 if (memcmp(rbuf, HTTP_200, 4) != 0) {
1384 /* there is no "HTTP", do it ourself */
1385 if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1389 if (!strstr(rbuf, "ontent-")) {
1390 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1392 * Counter-example of valid CGI without Content-type:
1393 * echo -en "HTTP/1.0 302 Found\r\n"
1394 * echo -en "Location: http://www.busybox.net\r\n"
1398 out_cnt = -1; /* buffering off */
1401 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1403 break; /* eof (or error) */
1405 if (full_write(STDOUT_FILENO, rbuf, count) != count)
1408 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1409 } /* if (pfd[FROM_CGI].revents) */
1415 #if ENABLE_FEATURE_HTTPD_CGI
1417 static void setenv1(const char *name, const char *value)
1419 setenv(name, value ? value : "", 1);
1423 * Spawn CGI script, forward CGI's stdin/out <=> network
1425 * Environment variables are set up and the script is invoked with pipes
1426 * for stdin/stdout. If a POST is being done the script is fed the POST
1427 * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1430 * const char *url The requested URL (with leading /).
1431 * const char *orig_uri The original URI before rewriting (if any)
1432 * int post_len Length of the POST body.
1433 * const char *cookie For set HTTP_COOKIE.
1434 * const char *content_type For set CONTENT_TYPE.
1436 static void send_cgi_and_exit(
1438 const char *orig_uri,
1439 const char *request,
1442 const char *content_type) NORETURN;
1443 static void send_cgi_and_exit(
1445 const char *orig_uri,
1446 const char *request,
1449 const char *content_type)
1451 struct fd_pair fromCgi; /* CGI -> httpd pipe */
1452 struct fd_pair toCgi; /* httpd -> CGI pipe */
1453 char *script, *last_slash;
1456 /* Make a copy. NB: caller guarantees:
1457 * url[0] == '/', url[1] != '/' */
1461 * We are mucking with environment _first_ and then vfork/exec,
1462 * this allows us to use vfork safely. Parent doesn't care about
1463 * these environment changes anyway.
1466 /* Check for [dirs/]script.cgi/PATH_INFO */
1467 last_slash = script = (char*)url;
1468 while ((script = strchr(script + 1, '/')) != NULL) {
1471 dir = is_directory(url + 1, /*followlinks:*/ 1);
1474 /* not directory, found script.cgi/PATH_INFO */
1477 /* is directory, find next '/' */
1478 last_slash = script;
1480 setenv1("PATH_INFO", script); /* set to /PATH_INFO or "" */
1481 setenv1("REQUEST_METHOD", request);
1483 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", orig_uri, g_query));
1485 setenv1("REQUEST_URI", orig_uri);
1488 *script = '\0'; /* cut off /PATH_INFO */
1490 /* SCRIPT_FILENAME is required by PHP in CGI mode */
1491 if (home_httpd[0] == '/') {
1492 char *fullpath = concat_path_file(home_httpd, url);
1493 setenv1("SCRIPT_FILENAME", fullpath);
1495 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1496 setenv1("SCRIPT_NAME", url);
1497 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1498 * QUERY_STRING: The information which follows the ? in the URL
1499 * which referenced this script. This is the query information.
1500 * It should not be decoded in any fashion. This variable
1501 * should always be set when there is query information,
1502 * regardless of command line decoding. */
1503 /* (Older versions of bbox seem to do some decoding) */
1504 setenv1("QUERY_STRING", g_query);
1505 putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1506 putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1507 putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1508 /* Having _separate_ variables for IP and port defeats
1509 * the purpose of having socket abstraction. Which "port"
1510 * are you using on Unix domain socket?
1511 * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1514 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1515 char *cp = strrchr(p, ':');
1516 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1518 if (cp) *cp = '\0'; /* delete :PORT */
1519 setenv1("REMOTE_ADDR", p);
1522 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1523 setenv1("REMOTE_PORT", cp + 1);
1527 setenv1("HTTP_USER_AGENT", G.user_agent);
1529 setenv1("HTTP_ACCEPT", G.http_accept);
1530 if (G.http_accept_language)
1531 setenv1("HTTP_ACCEPT_LANGUAGE", G.http_accept_language);
1533 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1535 setenv1("HTTP_COOKIE", cookie);
1537 setenv1("CONTENT_TYPE", content_type);
1538 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1540 setenv1("REMOTE_USER", remoteuser);
1541 putenv((char*)"AUTH_TYPE=Basic");
1545 setenv1("HTTP_REFERER", G.referer);
1546 setenv1("HTTP_HOST", G.host); /* set to "" if NULL */
1547 /* setenv1("SERVER_NAME", safe_gethostname()); - don't do this,
1548 * just run "env SERVER_NAME=xyz httpd ..." instead */
1550 xpiped_pair(fromCgi);
1555 /* TODO: log perror? */
1563 xfunc_error_retval = 242;
1565 /* NB: close _first_, then move fds! */
1568 xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */
1569 xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */
1570 /* User seeing stderr output can be a security problem.
1571 * If CGI really wants that, it can always do dup itself. */
1574 /* Chdiring to script's dir */
1575 script = last_slash;
1576 if (script != url) { /* paranoia */
1578 if (chdir(url + 1) != 0) {
1579 bb_perror_msg("can't change directory to '%s'", url + 1);
1580 goto error_execing_cgi;
1582 // not needed: *script = '/';
1586 /* set argv[0] to name without path */
1590 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1592 char *suffix = strrchr(script, '.');
1596 for (cur = script_i; cur; cur = cur->next) {
1597 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1598 /* found interpreter name */
1599 argv[0] = cur->after_colon;
1608 /* restore default signal dispositions for CGI process */
1615 /* _NOT_ execvp. We do not search PATH. argv[0] is a filename
1616 * without any dir components and will only match a file
1617 * in the current directory */
1618 execv(argv[0], argv);
1620 bb_perror_msg("can't execute '%s'", argv[0]);
1623 * (we are CGI here, our stdout is pumped to the net) */
1624 send_headers_and_exit(HTTP_NOT_FOUND);
1627 /* Parent process */
1629 /* Restore variables possibly changed by child */
1630 xfunc_error_retval = 0;
1635 cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1638 #endif /* FEATURE_HTTPD_CGI */
1641 * Send a file response to a HTTP request, and exit
1644 * const char *url The requested URL (with leading /).
1645 * what What to send (headers/body/both).
1647 static NOINLINE void send_file_and_exit(const char *url, int what)
1654 /* does <url>.gz exist? Then use it instead */
1655 char *gzurl = xasprintf("%s.gz", url);
1656 fd = open(gzurl, O_RDONLY);
1661 file_size = sb.st_size;
1662 last_mod = sb.st_mtime;
1664 IF_FEATURE_HTTPD_GZIP(content_gzip = 0;)
1665 fd = open(url, O_RDONLY);
1668 fd = open(url, O_RDONLY);
1672 bb_perror_msg("can't open '%s'", url);
1673 /* Error pages are sent by using send_file_and_exit(SEND_BODY).
1674 * IOW: it is unsafe to call send_headers_and_exit
1675 * if what is SEND_BODY! Can recurse! */
1676 if (what != SEND_BODY)
1677 send_headers_and_exit(HTTP_NOT_FOUND);
1680 /* If you want to know about EPIPE below
1681 * (happens if you abort downloads from local httpd): */
1682 signal(SIGPIPE, SIG_IGN);
1684 /* If not found, default is "application/octet-stream" */
1685 found_mime_type = "application/octet-stream";
1686 suffix = strrchr(url, '.');
1688 static const char suffixTable[] ALIGN1 =
1689 /* Shorter suffix must be first:
1690 * ".html.htm" will fail for ".htm"
1692 ".txt.h.c.cc.cpp\0" "text/plain\0"
1693 /* .htm line must be after .h line */
1694 ".htm.html\0" "text/html\0"
1695 ".jpg.jpeg\0" "image/jpeg\0"
1696 ".gif\0" "image/gif\0"
1697 ".png\0" "image/png\0"
1698 /* .css line must be after .c line */
1699 ".css\0" "text/css\0"
1700 ".wav\0" "audio/wav\0"
1701 ".avi\0" "video/x-msvideo\0"
1702 ".qt.mov\0" "video/quicktime\0"
1703 ".mpe.mpeg\0" "video/mpeg\0"
1704 ".mid.midi\0" "audio/midi\0"
1705 ".mp3\0" "audio/mpeg\0"
1706 #if 0 /* unpopular */
1707 ".au\0" "audio/basic\0"
1708 ".pac\0" "application/x-ns-proxy-autoconfig\0"
1709 ".vrml.wrl\0" "model/vrml\0"
1711 /* compiler adds another "\0" here */
1715 /* Examine built-in table */
1716 const char *table = suffixTable;
1717 const char *table_next;
1718 for (; *table; table = table_next) {
1719 const char *try_suffix;
1720 const char *mime_type;
1721 mime_type = table + strlen(table) + 1;
1722 table_next = mime_type + strlen(mime_type) + 1;
1723 try_suffix = strstr(table, suffix);
1726 try_suffix += strlen(suffix);
1727 if (*try_suffix == '\0' || *try_suffix == '.') {
1728 found_mime_type = mime_type;
1731 /* Example: strstr(table, ".av") != NULL, but it
1732 * does not match ".avi" after all and we end up here.
1733 * The table is arranged so that in this case we know
1734 * that it can't match anything in the following lines,
1735 * and we stop the search: */
1738 /* ...then user's table */
1739 for (cur = mime_a; cur; cur = cur->next) {
1740 if (strcmp(cur->before_colon, suffix) == 0) {
1741 found_mime_type = cur->after_colon;
1748 bb_error_msg("sending file '%s' content-type: %s",
1749 url, found_mime_type);
1751 #if ENABLE_FEATURE_HTTPD_RANGES
1752 if (what == SEND_BODY /* err pages and ranges don't mix */
1753 || content_gzip /* we are sending compressed page: can't do ranges */ ///why?
1757 range_len = MAXINT(off_t);
1758 if (range_start >= 0) {
1759 if (!range_end || range_end > file_size - 1) {
1760 range_end = file_size - 1;
1762 if (range_end < range_start
1763 || lseek(fd, range_start, SEEK_SET) != range_start
1765 lseek(fd, 0, SEEK_SET);
1768 range_len = range_end - range_start + 1;
1769 send_headers(HTTP_PARTIAL_CONTENT);
1774 if (what & SEND_HEADERS)
1775 send_headers(HTTP_OK);
1776 #if ENABLE_FEATURE_USE_SENDFILE
1778 off_t offset = range_start;
1780 /* sz is rounded down to 64k */
1781 ssize_t sz = MAXINT(ssize_t) - 0xffff;
1782 IF_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1783 count = sendfile(STDOUT_FILENO, fd, &offset, sz);
1785 if (offset == range_start)
1786 break; /* fall back to read/write loop */
1789 IF_FEATURE_HTTPD_RANGES(range_len -= count;)
1790 if (count == 0 || range_len == 0)
1795 while ((count = safe_read(fd, iobuf, IOBUF_SIZE)) > 0) {
1797 IF_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1798 n = full_write(STDOUT_FILENO, iobuf, count);
1801 IF_FEATURE_HTTPD_RANGES(range_len -= count;)
1806 IF_FEATURE_USE_SENDFILE(fin:)
1808 bb_perror_msg("error");
1813 static int checkPermIP(void)
1817 for (cur = ip_a_d; cur; cur = cur->next) {
1820 "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1822 (unsigned char)(cur->ip >> 24),
1823 (unsigned char)(cur->ip >> 16),
1824 (unsigned char)(cur->ip >> 8),
1825 (unsigned char)(cur->ip),
1826 (unsigned char)(cur->mask >> 24),
1827 (unsigned char)(cur->mask >> 16),
1828 (unsigned char)(cur->mask >> 8),
1829 (unsigned char)(cur->mask)
1832 if ((rmt_ip & cur->mask) == cur->ip)
1833 return (cur->allow_deny == 'A'); /* A -> 1 */
1836 return !flg_deny_all; /* depends on whether we saw "D:*" */
1839 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1842 struct pam_userinfo {
1847 static int pam_talker(int num_msg,
1848 const struct pam_message **msg,
1849 struct pam_response **resp,
1853 struct pam_userinfo *userinfo = (struct pam_userinfo *) appdata_ptr;
1854 struct pam_response *response;
1856 if (!resp || !msg || !userinfo)
1857 return PAM_CONV_ERR;
1859 /* allocate memory to store response */
1860 response = xzalloc(num_msg * sizeof(*response));
1863 for (i = 0; i < num_msg; i++) {
1866 switch (msg[i]->msg_style) {
1867 case PAM_PROMPT_ECHO_ON:
1870 case PAM_PROMPT_ECHO_OFF:
1879 return PAM_CONV_ERR;
1881 response[i].resp = xstrdup(s);
1882 if (PAM_SUCCESS != 0)
1883 response[i].resp_retcode = PAM_SUCCESS;
1891 * Config file entries are of the form "/<path>:<user>:<passwd>".
1892 * If config file has no prefix match for path, access is allowed.
1894 * path The file path
1895 * user_and_passwd "user:passwd" to validate
1897 * Returns 1 if user_and_passwd is OK.
1899 static int check_user_passwd(const char *path, char *user_and_passwd)
1902 const char *prev = NULL;
1904 for (cur = g_auth; cur; cur = cur->next) {
1905 const char *dir_prefix;
1909 dir_prefix = cur->before_colon;
1912 /* If already saw a match, don't accept other different matches */
1913 if (prev && strcmp(prev, dir_prefix) != 0)
1917 fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd);
1919 /* If it's not a prefix match, continue searching */
1920 len = strlen(dir_prefix);
1921 if (len != 1 /* dir_prefix "/" matches all, don't need to check */
1922 && (strncmp(dir_prefix, path, len) != 0
1923 || (path[len] != '/' && path[len] != '\0')
1929 /* Path match found */
1932 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1933 char *colon_after_user;
1935 # if ENABLE_FEATURE_SHADOWPASSWDS && !ENABLE_PAM
1939 colon_after_user = strchr(user_and_passwd, ':');
1940 if (!colon_after_user)
1943 /* compare "user:" */
1944 if (cur->after_colon[0] != '*'
1945 && strncmp(cur->after_colon, user_and_passwd,
1946 colon_after_user - user_and_passwd + 1) != 0
1950 /* this cfg entry is '*' or matches username from peer */
1952 passwd = strchr(cur->after_colon, ':');
1956 if (passwd[0] == '*') {
1958 struct pam_userinfo userinfo;
1959 struct pam_conv conv_info = { &pam_talker, (void *) &userinfo };
1962 *colon_after_user = '\0';
1963 userinfo.name = user_and_passwd;
1964 userinfo.pw = colon_after_user + 1;
1965 r = pam_start("httpd", user_and_passwd, &conv_info, &pamh) != PAM_SUCCESS;
1967 r = pam_authenticate(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS
1968 || pam_acct_mgmt(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS
1970 pam_end(pamh, PAM_SUCCESS);
1972 *colon_after_user = ':';
1973 goto end_check_passwd;
1975 # if ENABLE_FEATURE_SHADOWPASSWDS
1976 /* Using _r function to avoid pulling in static buffers */
1981 *colon_after_user = '\0';
1982 pw = getpwnam(user_and_passwd);
1983 *colon_after_user = ':';
1984 if (!pw || !pw->pw_passwd)
1986 passwd = pw->pw_passwd;
1987 # if ENABLE_FEATURE_SHADOWPASSWDS
1988 if ((passwd[0] == 'x' || passwd[0] == '*') && !passwd[1]) {
1989 /* getspnam_r may return 0 yet set result to NULL.
1990 * At least glibc 2.4 does this. Be extra paranoid here. */
1991 struct spwd *result = NULL;
1992 r = getspnam_r(pw->pw_name, &spw, sp_buf, sizeof(sp_buf), &result);
1993 if (r == 0 && result)
1994 passwd = result->sp_pwdp;
1997 /* In this case, passwd is ALWAYS encrypted:
1998 * it came from /etc/passwd or /etc/shadow!
2000 goto check_encrypted;
2001 # endif /* ENABLE_PAM */
2003 /* Else: passwd is from httpd.conf, it is either plaintext or encrypted */
2005 if (passwd[0] == '$' && isdigit(passwd[1])) {
2010 /* encrypt pwd from peer and check match with local one */
2011 encrypted = pw_encrypt(
2012 /* pwd (from peer): */ colon_after_user + 1,
2016 r = strcmp(encrypted, passwd);
2019 /* local passwd is from httpd.conf and it's plaintext */
2020 r = strcmp(colon_after_user + 1, passwd);
2022 goto end_check_passwd;
2025 /* Comparing plaintext "user:pass" in one go */
2026 r = strcmp(cur->after_colon, user_and_passwd);
2029 remoteuser = xstrndup(user_and_passwd,
2030 strchrnul(user_and_passwd, ':') - user_and_passwd
2036 /* 0(bad) if prev is set: matches were found but passwd was wrong */
2037 return (prev == NULL);
2039 #endif /* FEATURE_HTTPD_BASIC_AUTH */
2041 #if ENABLE_FEATURE_HTTPD_PROXY
2042 static Htaccess_Proxy *find_proxy_entry(const char *url)
2045 for (p = proxy; p; p = p->next) {
2046 if (is_prefixed_with(url, p->url_from))
2056 static void send_REQUEST_TIMEOUT_and_exit(int sig) NORETURN;
2057 static void send_REQUEST_TIMEOUT_and_exit(int sig UNUSED_PARAM)
2059 send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
2063 * Handle an incoming http request and exit.
2065 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN;
2066 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
2068 static const char request_GET[] ALIGN1 = "GET";
2073 #if ENABLE_FEATURE_HTTPD_CGI
2074 static const char request_HEAD[] ALIGN1 = "HEAD";
2075 const char *prequest;
2076 char *cookie = NULL;
2077 char *content_type = NULL;
2078 unsigned long length = 0;
2079 #elif ENABLE_FEATURE_HTTPD_PROXY
2080 #define prequest request_GET
2081 unsigned long length = 0;
2083 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2084 smallint authorized = -1;
2086 smallint ip_allowed;
2087 char http_major_version;
2088 #if ENABLE_FEATURE_HTTPD_PROXY
2089 char http_minor_version;
2090 char *header_buf = header_buf; /* for gcc */
2091 char *header_ptr = header_ptr;
2092 Htaccess_Proxy *proxy_entry;
2095 /* Allocation of iobuf is postponed until now
2096 * (IOW, server process doesn't need to waste 8k) */
2097 iobuf = xmalloc(IOBUF_SIZE);
2100 if (fromAddr->u.sa.sa_family == AF_INET) {
2101 rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr);
2103 #if ENABLE_FEATURE_IPV6
2104 if (fromAddr->u.sa.sa_family == AF_INET6
2105 && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0
2106 && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0
2107 && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff)
2108 rmt_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]);
2110 if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
2111 /* NB: can be NULL (user runs httpd -i by hand?) */
2112 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa);
2115 /* this trick makes -v logging much simpler */
2117 applet_name = rmt_ip_str;
2119 bb_error_msg("connected");
2122 /* Install timeout handler. get_line() needs it. */
2123 signal(SIGALRM, send_REQUEST_TIMEOUT_and_exit);
2125 if (!get_line()) /* EOF or error or empty line */
2126 send_headers_and_exit(HTTP_BAD_REQUEST);
2128 /* Determine type of request (GET/POST) */
2129 // rfc2616: method and URI is separated by exactly one space
2130 //urlp = strpbrk(iobuf, " \t"); - no, tab isn't allowed
2131 urlp = strchr(iobuf, ' ');
2133 send_headers_and_exit(HTTP_BAD_REQUEST);
2135 #if ENABLE_FEATURE_HTTPD_CGI
2136 prequest = request_GET;
2137 if (strcasecmp(iobuf, prequest) != 0) {
2138 prequest = request_HEAD;
2139 if (strcasecmp(iobuf, prequest) != 0) {
2141 if (strcasecmp(iobuf, prequest) != 0)
2142 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2146 if (strcasecmp(iobuf, request_GET) != 0)
2147 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2149 // rfc2616: method and URI is separated by exactly one space
2150 //urlp = skip_whitespace(urlp); - should not be necessary
2152 send_headers_and_exit(HTTP_BAD_REQUEST);
2154 /* Find end of URL and parse HTTP version, if any */
2155 http_major_version = '0';
2156 IF_FEATURE_HTTPD_PROXY(http_minor_version = '0';)
2157 tptr = strchrnul(urlp, ' ');
2158 /* Is it " HTTP/"? */
2159 if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) {
2160 http_major_version = tptr[6];
2161 IF_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];)
2165 /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
2166 urlcopy = alloca((tptr - urlp) + 2 + strlen(index_page));
2167 /*if (urlcopy == NULL)
2168 * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
2169 strcpy(urlcopy, urlp);
2170 /* NB: urlcopy ptr is never changed after this */
2172 /* Extract url args if present */
2173 /* g_query = NULL; - already is */
2174 tptr = strchr(urlcopy, '?');
2180 /* Decode URL escape sequences */
2181 tptr = percent_decode_in_place(urlcopy, /*strict:*/ 1);
2183 send_headers_and_exit(HTTP_BAD_REQUEST);
2184 if (tptr == urlcopy + 1) {
2185 /* '/' or NUL is encoded */
2186 send_headers_and_exit(HTTP_NOT_FOUND);
2189 /* Canonicalize path */
2190 /* Algorithm stolen from libbb bb_simplify_path(),
2191 * but don't strdup, retain trailing slash, protect root */
2192 urlp = tptr = urlcopy;
2195 /* skip duplicate (or initial) slash */
2200 if (tptr[1] == '.' && (tptr[2] == '/' || tptr[2] == '\0')) {
2201 /* "..": be careful */
2203 if (urlp == urlcopy)
2204 send_headers_and_exit(HTTP_BAD_REQUEST);
2205 /* omit previous dir */
2206 while (*--urlp != '/')
2208 /* skip to "./" or ".<NUL>" */
2211 if (tptr[1] == '/' || tptr[1] == '\0') {
2212 /* skip extra "/./" */
2224 /* If URL is a directory, add '/' */
2225 if (urlp[-1] != '/') {
2226 if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) {
2227 found_moved_temporarily = urlcopy;
2233 bb_error_msg("url:%s", urlcopy);
2236 ip_allowed = checkPermIP();
2237 while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
2238 /* have path1/path2 */
2240 if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) {
2241 /* may have subdir config */
2242 parse_conf(urlcopy + 1, SUBDIR_PARSE);
2243 ip_allowed = checkPermIP();
2248 #if ENABLE_FEATURE_HTTPD_PROXY
2249 proxy_entry = find_proxy_entry(urlcopy);
2251 header_buf = header_ptr = xmalloc(IOBUF_SIZE);
2254 if (http_major_version >= '0') {
2255 /* Request was with "... HTTP/nXXX", and n >= 0 */
2257 /* Read until blank line */
2260 break; /* EOF or error or empty line */
2262 bb_error_msg("header: '%s'", iobuf);
2264 #if ENABLE_FEATURE_HTTPD_PROXY
2265 /* We need 2 more bytes for yet another "\r\n" -
2266 * see near fdprintf(proxy_fd...) further below */
2267 if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 4) {
2268 int len = strnlen(iobuf, IOBUF_SIZE - (header_ptr - header_buf) - 4);
2269 memcpy(header_ptr, iobuf, len);
2271 header_ptr[0] = '\r';
2272 header_ptr[1] = '\n';
2277 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
2278 /* Try and do our best to parse more lines */
2279 if ((STRNCASECMP(iobuf, "Content-Length:") == 0)) {
2280 /* extra read only for POST */
2281 if (prequest != request_GET
2282 # if ENABLE_FEATURE_HTTPD_CGI
2283 && prequest != request_HEAD
2286 tptr = skip_whitespace(iobuf + sizeof("Content-Length:") - 1);
2288 send_headers_and_exit(HTTP_BAD_REQUEST);
2289 /* not using strtoul: it ignores leading minus! */
2290 length = bb_strtou(tptr, NULL, 10);
2291 /* length is "ulong", but we need to pass it to int later */
2292 if (errno || length > INT_MAX)
2293 send_headers_and_exit(HTTP_BAD_REQUEST);
2297 #if ENABLE_FEATURE_HTTPD_CGI
2298 else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
2299 if (!cookie) /* in case they send millions of these, do not OOM */
2300 cookie = xstrdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
2301 } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
2303 content_type = xstrdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
2304 } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
2306 G.referer = xstrdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
2307 } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
2309 G.user_agent = xstrdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
2310 } else if (STRNCASECMP(iobuf, "Host:") == 0) {
2312 G.host = xstrdup(skip_whitespace(iobuf + sizeof("Host:")-1));
2313 } else if (STRNCASECMP(iobuf, "Accept:") == 0) {
2315 G.http_accept = xstrdup(skip_whitespace(iobuf + sizeof("Accept:")-1));
2316 } else if (STRNCASECMP(iobuf, "Accept-Language:") == 0) {
2317 if (!G.http_accept_language)
2318 G.http_accept_language = xstrdup(skip_whitespace(iobuf + sizeof("Accept-Language:")-1));
2321 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2322 if (STRNCASECMP(iobuf, "Authorization:") == 0) {
2323 /* We only allow Basic credentials.
2324 * It shows up as "Authorization: Basic <user>:<passwd>" where
2325 * "<user>:<passwd>" is base64 encoded.
2327 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
2328 if (STRNCASECMP(tptr, "Basic") != 0)
2330 tptr += sizeof("Basic")-1;
2331 /* decodeBase64() skips whitespace itself */
2333 authorized = check_user_passwd(urlcopy, tptr);
2336 #if ENABLE_FEATURE_HTTPD_RANGES
2337 if (STRNCASECMP(iobuf, "Range:") == 0) {
2338 /* We know only bytes=NNN-[MMM] */
2339 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
2340 if (is_prefixed_with(s, "bytes=") == 0) {
2341 s += sizeof("bytes=")-1;
2342 range_start = BB_STRTOOFF(s, &s, 10);
2343 if (s[0] != '-' || range_start < 0) {
2346 range_end = BB_STRTOOFF(s+1, NULL, 10);
2347 if (errno || range_end < range_start)
2353 #if ENABLE_FEATURE_HTTPD_GZIP
2354 if (STRNCASECMP(iobuf, "Accept-Encoding:") == 0) {
2355 /* Note: we do not support "gzip;q=0"
2356 * method of _disabling_ gzip
2357 * delivery. No one uses that, though */
2358 const char *s = strstr(iobuf, "gzip");
2360 // want more thorough checks?
2370 } /* while extra header reading */
2373 /* We are done reading headers, disable peer timeout */
2376 if (strcmp(bb_basename(urlcopy), HTTPD_CONF) == 0 || !ip_allowed) {
2377 /* protect listing [/path]/httpd.conf or IP deny */
2378 send_headers_and_exit(HTTP_FORBIDDEN);
2381 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2382 /* Case: no "Authorization:" was seen, but page might require passwd.
2383 * Check that with dummy user:pass */
2385 authorized = check_user_passwd(urlcopy, (char *) "");
2387 send_headers_and_exit(HTTP_UNAUTHORIZED);
2390 if (found_moved_temporarily) {
2391 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
2394 #if ENABLE_FEATURE_HTTPD_PROXY
2395 if (proxy_entry != NULL) {
2397 len_and_sockaddr *lsa;
2399 lsa = host2sockaddr(proxy_entry->host_port, 80);
2401 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2402 proxy_fd = socket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
2404 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2405 if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0)
2406 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2407 fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n",
2408 prequest, /* GET or POST */
2409 proxy_entry->url_to, /* url part 1 */
2410 urlcopy + strlen(proxy_entry->url_from), /* url part 2 */
2411 (g_query ? "?" : ""), /* "?" (maybe) */
2412 (g_query ? g_query : ""), /* query string (maybe) */
2413 http_major_version, http_minor_version);
2414 header_ptr[0] = '\r';
2415 header_ptr[1] = '\n';
2417 write(proxy_fd, header_buf, header_ptr - header_buf);
2418 free(header_buf); /* on the order of 8k, free it */
2419 cgi_io_loop_and_exit(proxy_fd, proxy_fd, length);
2423 tptr = urlcopy + 1; /* skip first '/' */
2425 #if ENABLE_FEATURE_HTTPD_CGI
2426 if (is_prefixed_with(tptr, "cgi-bin/")) {
2427 if (tptr[8] == '\0') {
2428 /* protect listing "cgi-bin/" */
2429 send_headers_and_exit(HTTP_FORBIDDEN);
2431 send_cgi_and_exit(urlcopy, urlcopy, prequest, length, cookie, content_type);
2435 if (urlp[-1] == '/') {
2436 /* When index_page string is appended to <dir>/ URL, it overwrites
2437 * the query string. If we fall back to call /cgi-bin/index.cgi,
2438 * query string would be lost and not available to the CGI.
2439 * Work around it by making a deep copy.
2441 if (ENABLE_FEATURE_HTTPD_CGI)
2442 g_query = xstrdup(g_query); /* ok for NULL too */
2443 strcpy(urlp, index_page);
2445 if (stat(tptr, &sb) == 0) {
2446 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
2447 char *suffix = strrchr(tptr, '.');
2450 for (cur = script_i; cur; cur = cur->next) {
2451 if (strcmp(cur->before_colon + 1, suffix) == 0) {
2452 send_cgi_and_exit(urlcopy, urlcopy, prequest, length, cookie, content_type);
2457 file_size = sb.st_size;
2458 last_mod = sb.st_mtime;
2460 #if ENABLE_FEATURE_HTTPD_CGI
2461 else if (urlp[-1] == '/') {
2462 /* It's a dir URL and there is no index.html
2463 * Try cgi-bin/index.cgi */
2464 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
2465 urlp[0] = '\0'; /* remove index_page */
2466 send_cgi_and_exit("/cgi-bin/index.cgi", urlcopy, prequest, length, cookie, content_type);
2469 /* else fall through to send_file, it errors out if open fails: */
2471 if (prequest != request_GET && prequest != request_HEAD) {
2472 /* POST for files does not make sense */
2473 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2475 send_file_and_exit(tptr,
2476 (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS)
2479 send_file_and_exit(tptr, SEND_HEADERS_AND_BODY);
2484 * The main http server function.
2485 * Given a socket, listen for new connections and farm out
2486 * the processing as a [v]forked process.
2490 static void mini_httpd(int server_socket) NORETURN;
2491 static void mini_httpd(int server_socket)
2493 /* NB: it's best to not use xfuncs in this loop before fork().
2494 * Otherwise server may die on transient errors (temporary
2495 * out-of-memory condition, etc), which is Bad(tm).
2496 * Try to do any dangerous calls after fork.
2500 len_and_sockaddr fromAddr;
2502 /* Wait for connections... */
2503 fromAddr.len = LSA_SIZEOF_SA;
2504 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2508 /* set the KEEPALIVE option to cull dead connections */
2509 setsockopt_keepalive(n);
2513 /* Do not reload config on HUP */
2514 signal(SIGHUP, SIG_IGN);
2515 close(server_socket);
2519 handle_incoming_and_exit(&fromAddr);
2521 /* parent, or fork failed */
2527 static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN;
2528 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2530 char *argv_copy[argc + 2];
2532 argv_copy[0] = argv[0];
2533 argv_copy[1] = (char*)"-i";
2534 memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2536 /* NB: it's best to not use xfuncs in this loop before vfork().
2537 * Otherwise server may die on transient errors (temporary
2538 * out-of-memory condition, etc), which is Bad(tm).
2539 * Try to do any dangerous calls after fork.
2543 len_and_sockaddr fromAddr;
2545 /* Wait for connections... */
2546 fromAddr.len = LSA_SIZEOF_SA;
2547 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2551 /* set the KEEPALIVE option to cull dead connections */
2552 setsockopt_keepalive(n);
2556 /* Do not reload config on HUP */
2557 signal(SIGHUP, SIG_IGN);
2558 close(server_socket);
2562 /* Run a copy of ourself in inetd mode */
2565 argv_copy[0][0] &= 0x7f;
2566 /* parent, or vfork failed */
2574 * Process a HTTP connection on stdin/out.
2577 static void mini_httpd_inetd(void) NORETURN;
2578 static void mini_httpd_inetd(void)
2580 len_and_sockaddr fromAddr;
2582 memset(&fromAddr, 0, sizeof(fromAddr));
2583 fromAddr.len = LSA_SIZEOF_SA;
2584 /* NB: can fail if user runs it by hand and types in http cmds */
2585 getpeername(0, &fromAddr.u.sa, &fromAddr.len);
2586 handle_incoming_and_exit(&fromAddr);
2589 static void sighup_handler(int sig UNUSED_PARAM)
2591 parse_conf(DEFAULT_PATH_HTTPD_CONF, SIGNALED_PARSE);
2595 c_opt_config_file = 0,
2598 IF_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2599 IF_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,)
2600 IF_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,)
2601 IF_FEATURE_HTTPD_SETUID( u_opt_setuid ,)
2606 OPT_CONFIG_FILE = 1 << c_opt_config_file,
2607 OPT_DECODE_URL = 1 << d_opt_decode_url,
2608 OPT_HOME_HTTPD = 1 << h_opt_home_httpd,
2609 OPT_ENCODE_URL = IF_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2610 OPT_REALM = IF_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0,
2611 OPT_MD5 = IF_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0,
2612 OPT_SETUID = IF_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0,
2613 OPT_PORT = 1 << p_opt_port,
2614 OPT_INETD = 1 << p_opt_inetd,
2615 OPT_FOREGROUND = 1 << p_opt_foreground,
2616 OPT_VERBOSE = 1 << p_opt_verbose,
2620 int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2621 int httpd_main(int argc UNUSED_PARAM, char **argv)
2623 int server_socket = server_socket; /* for gcc */
2625 char *url_for_decode;
2626 IF_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2627 IF_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2628 IF_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2629 IF_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2633 #if ENABLE_LOCALE_SUPPORT
2634 /* Undo busybox.c: we want to speak English in http (dates etc) */
2635 setlocale(LC_TIME, "C");
2638 home_httpd = xrealloc_getcwd_or_warn(NULL);
2639 /* We do not "absolutize" path given by -h (home) opt.
2640 * If user gives relative path in -h,
2641 * $SCRIPT_FILENAME will not be set. */
2642 opt = getopt32(argv, "^"
2644 IF_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2645 IF_FEATURE_HTTPD_BASIC_AUTH("r:")
2646 IF_FEATURE_HTTPD_AUTH_MD5("m:")
2647 IF_FEATURE_HTTPD_SETUID("u:")
2650 /* -v counts, -i implies -f */
2652 &opt_c_configFile, &url_for_decode, &home_httpd
2653 IF_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2654 IF_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2655 IF_FEATURE_HTTPD_AUTH_MD5(, &pass)
2656 IF_FEATURE_HTTPD_SETUID(, &s_ugid)
2657 , &bind_addr_or_port
2660 if (opt & OPT_DECODE_URL) {
2661 fputs(percent_decode_in_place(url_for_decode, /*strict:*/ 0), stdout);
2664 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2665 if (opt & OPT_ENCODE_URL) {
2666 fputs(encodeString(url_for_encode), stdout);
2670 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2671 if (opt & OPT_MD5) {
2672 char salt[sizeof("$1$XXXXXXXX")];
2676 crypt_make_salt(salt + 3, 4);
2677 puts(pw_encrypt(pass, salt, /*cleanup:*/ 0));
2681 #if ENABLE_FEATURE_HTTPD_SETUID
2682 if (opt & OPT_SETUID) {
2683 xget_uidgid(&ugid, s_ugid);
2688 if (!(opt & OPT_FOREGROUND)) {
2689 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2694 if (!(opt & OPT_INETD)) {
2695 signal(SIGCHLD, SIG_IGN);
2696 server_socket = openServer();
2697 #if ENABLE_FEATURE_HTTPD_SETUID
2698 /* drop privileges */
2699 if (opt & OPT_SETUID) {
2700 if (ugid.gid != (gid_t)-1) {
2701 if (setgroups(1, &ugid.gid) == -1)
2702 bb_perror_msg_and_die("setgroups");
2711 /* User can do it himself: 'env - PATH="$PATH" httpd'
2712 * We don't do it because we don't want to screw users
2714 * 'env - VAR1=val1 VAR2=val2 httpd'
2715 * and have VAR1 and VAR2 values visible in their CGIs.
2716 * Besides, it is also smaller. */
2718 char *p = getenv("PATH");
2719 /* env strings themself are not freed, no need to xstrdup(p): */
2723 // if (!(opt & OPT_INETD))
2724 // setenv_long("SERVER_PORT", ???);
2728 parse_conf(DEFAULT_PATH_HTTPD_CONF, FIRST_PARSE);
2729 if (!(opt & OPT_INETD))
2730 signal(SIGHUP, sighup_handler);
2732 xfunc_error_retval = 0;
2733 if (opt & OPT_INETD)
2736 if (!(opt & OPT_FOREGROUND))
2737 bb_daemonize(0); /* don't change current directory */
2738 mini_httpd(server_socket); /* never returns */
2740 mini_httpd_nommu(server_socket, argc, argv); /* never returns */