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"
129 /* PAM may include <locale.h>. We may need to undefine bbox's stub define: */
131 /* For some obscure reason, PAM is not in pam/xxx, but in security/xxx.
132 * Apparently they like to confuse people. */
133 # include <security/pam_appl.h>
134 # include <security/pam_misc.h>
136 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
137 # include <sys/sendfile.h>
139 /* amount of buffering in a pipe */
141 # define PIPE_BUF 4096
146 #define IOBUF_SIZE 8192
147 #if PIPE_BUF >= IOBUF_SIZE
148 # error "PIPE_BUF >= IOBUF_SIZE"
151 #define HEADER_READ_TIMEOUT 60
153 static const char DEFAULT_PATH_HTTPD_CONF[] ALIGN1 = "/etc";
154 static const char HTTPD_CONF[] ALIGN1 = "httpd.conf";
155 static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
156 static const char index_html[] ALIGN1 = "index.html";
158 typedef struct has_next_ptr {
159 struct has_next_ptr *next;
162 /* Must have "next" as a first member */
163 typedef struct Htaccess {
164 struct Htaccess *next;
166 char before_colon[1]; /* really bigger, must be last */
169 /* Must have "next" as a first member */
170 typedef struct Htaccess_IP {
171 struct Htaccess_IP *next;
177 /* Must have "next" as a first member */
178 typedef struct Htaccess_Proxy {
179 struct Htaccess_Proxy *next;
187 HTTP_PARTIAL_CONTENT = 206,
188 HTTP_MOVED_TEMPORARILY = 302,
189 HTTP_BAD_REQUEST = 400, /* malformed syntax */
190 HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
191 HTTP_NOT_FOUND = 404,
192 HTTP_FORBIDDEN = 403,
193 HTTP_REQUEST_TIMEOUT = 408,
194 HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */
195 HTTP_INTERNAL_SERVER_ERROR = 500,
197 #if 0 /* future use */
198 HTTP_SWITCHING_PROTOCOLS = 101,
201 HTTP_NON_AUTHORITATIVE_INFO = 203,
202 HTTP_NO_CONTENT = 204,
203 HTTP_MULTIPLE_CHOICES = 300,
204 HTTP_MOVED_PERMANENTLY = 301,
205 HTTP_NOT_MODIFIED = 304,
206 HTTP_PAYMENT_REQUIRED = 402,
207 HTTP_BAD_GATEWAY = 502,
208 HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
212 static const uint16_t http_response_type[] ALIGN2 = {
214 #if ENABLE_FEATURE_HTTPD_RANGES
215 HTTP_PARTIAL_CONTENT,
217 HTTP_MOVED_TEMPORARILY,
218 HTTP_REQUEST_TIMEOUT,
219 HTTP_NOT_IMPLEMENTED,
220 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
226 HTTP_INTERNAL_SERVER_ERROR,
227 #if 0 /* not implemented */
231 HTTP_MULTIPLE_CHOICES,
232 HTTP_MOVED_PERMANENTLY,
235 HTTP_SERVICE_UNAVAILABLE,
239 static const struct {
242 } http_response[ARRAY_SIZE(http_response_type)] = {
244 #if ENABLE_FEATURE_HTTPD_RANGES
245 { "Partial Content", NULL },
248 { "Request Timeout", "No request appeared within 60 seconds" },
249 { "Not Implemented", "The requested method is not recognized" },
250 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
251 { "Unauthorized", "" },
253 { "Not Found", "The requested URL was not found" },
254 { "Bad Request", "Unsupported method" },
256 { "Internal Server Error", "Internal Server Error" },
257 #if 0 /* not implemented */
261 { "Multiple Choices" },
262 { "Moved Permanently" },
264 { "Bad Gateway", "" },
265 { "Service Unavailable", "" },
270 int verbose; /* must be int (used by getopt32) */
271 smallint flg_deny_all;
273 unsigned rmt_ip; /* used for IP-based allow/deny rules */
275 char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */
276 const char *bind_addr_or_port;
279 const char *opt_c_configFile;
280 const char *home_httpd;
281 const char *index_page;
283 const char *found_mime_type;
284 const char *found_moved_temporarily;
285 Htaccess_IP *ip_a_d; /* config allow/deny lines */
287 IF_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
288 IF_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
289 IF_FEATURE_HTTPD_CGI(char *referer;)
290 IF_FEATURE_HTTPD_CGI(char *user_agent;)
291 IF_FEATURE_HTTPD_CGI(char *host;)
292 IF_FEATURE_HTTPD_CGI(char *http_accept;)
293 IF_FEATURE_HTTPD_CGI(char *http_accept_language;)
295 off_t file_size; /* -1 - unknown */
296 #if ENABLE_FEATURE_HTTPD_RANGES
302 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
303 Htaccess *g_auth; /* config user:password lines */
305 Htaccess *mime_a; /* config mime types */
306 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
307 Htaccess *script_i; /* config script interpreters */
309 char *iobuf; /* [IOBUF_SIZE] */
310 #define hdr_buf bb_common_bufsiz1
313 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
314 const char *http_error_page[ARRAY_SIZE(http_response_type)];
316 #if ENABLE_FEATURE_HTTPD_PROXY
317 Htaccess_Proxy *proxy;
319 #if ENABLE_FEATURE_HTTPD_GZIP
320 /* client can handle gzip / we are going to send gzip */
321 smallint content_gzip;
324 #define G (*ptr_to_globals)
325 #define verbose (G.verbose )
326 #define flg_deny_all (G.flg_deny_all )
327 #define rmt_ip (G.rmt_ip )
328 #define bind_addr_or_port (G.bind_addr_or_port)
329 #define g_query (G.g_query )
330 #define opt_c_configFile (G.opt_c_configFile )
331 #define home_httpd (G.home_httpd )
332 #define index_page (G.index_page )
333 #define found_mime_type (G.found_mime_type )
334 #define found_moved_temporarily (G.found_moved_temporarily)
335 #define last_mod (G.last_mod )
336 #define ip_a_d (G.ip_a_d )
337 #define g_realm (G.g_realm )
338 #define remoteuser (G.remoteuser )
339 #define referer (G.referer )
340 #define user_agent (G.user_agent )
341 #define host (G.host )
342 #define http_accept (G.http_accept )
343 #define http_accept_language (G.http_accept_language)
344 #define file_size (G.file_size )
345 #if ENABLE_FEATURE_HTTPD_RANGES
346 #define range_start (G.range_start )
347 #define range_end (G.range_end )
348 #define range_len (G.range_len )
352 range_end = MAXINT(off_t) - 1,
353 range_len = MAXINT(off_t),
356 #define rmt_ip_str (G.rmt_ip_str )
357 #define g_auth (G.g_auth )
358 #define mime_a (G.mime_a )
359 #define script_i (G.script_i )
360 #define iobuf (G.iobuf )
361 #define hdr_ptr (G.hdr_ptr )
362 #define hdr_cnt (G.hdr_cnt )
363 #define http_error_page (G.http_error_page )
364 #define proxy (G.proxy )
365 #if ENABLE_FEATURE_HTTPD_GZIP
366 # define content_gzip (G.content_gzip )
368 # define content_gzip 0
370 #define INIT_G() do { \
371 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
372 IF_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
373 bind_addr_or_port = "80"; \
374 index_page = index_html; \
379 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
383 SEND_HEADERS = (1 << 0),
384 SEND_BODY = (1 << 1),
385 SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY,
387 static void send_file_and_exit(const char *url, int what) NORETURN;
389 static void free_llist(has_next_ptr **pptr)
391 has_next_ptr *cur = *pptr;
393 has_next_ptr *t = cur;
400 static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
402 free_llist((has_next_ptr**)pptr);
405 static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
407 free_llist((has_next_ptr**)pptr);
410 /* Returns presumed mask width in bits or < 0 on error.
411 * Updates strp, stores IP at provided pointer */
412 static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
414 const char *p = *strp;
422 for (j = 0; j < 4; j++) {
425 if ((*p < '0' || *p > '9') && *p != '/' && *p)
428 while (*p >= '0' && *p <= '9') {
439 ip = (ip << 8) | octet;
453 /* Returns 0 on success. Stores IP and mask at provided pointers */
454 static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
460 i = scan_ip(&str, ipp, '/');
465 /* there is /xxx after dotted-IP address */
466 i = bb_strtou(str, &p, 10);
468 /* 'xxx' itself is dotted-IP mask, parse it */
469 /* (return 0 (success) only if it has N.N.N.N form) */
470 return scan_ip(&str, maskp, '\0') - 32;
479 if (sizeof(unsigned) == 4 && i == 32) {
480 /* mask >>= 32 below may not work */
486 /* i == 0 -> *maskp = 0x00000000
487 * i == 1 -> *maskp = 0x80000000
488 * i == 4 -> *maskp = 0xf0000000
489 * i == 31 -> *maskp = 0xfffffffe
490 * i == 32 -> *maskp = 0xffffffff */
491 *maskp = (uint32_t)(~mask);
496 * Parse configuration file into in-memory linked list.
498 * Any previous IP rules are discarded.
499 * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
500 * are also discarded. That is, previous settings are retained if flag is
502 * Error pages are only parsed on the main config file.
504 * path Path where to look for httpd.conf (without filename).
505 * flag Type of the parse request.
509 FIRST_PARSE = 0, /* path will be "/etc" */
510 SIGNALED_PARSE = 1, /* path will be "/etc" */
511 SUBDIR_PARSE = 2, /* path will be derived from URL */
513 static void parse_conf(const char *path, int flag)
515 /* internally used extra flag state */
516 enum { TRY_CURDIR_PARSE = 3 };
519 const char *filename;
522 /* discard old rules */
523 free_Htaccess_IP_list(&ip_a_d);
525 /* retain previous auth and mime config only for subdir parse */
526 if (flag != SUBDIR_PARSE) {
527 free_Htaccess_list(&mime_a);
528 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
529 free_Htaccess_list(&g_auth);
531 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
532 free_Htaccess_list(&script_i);
536 filename = opt_c_configFile;
537 if (flag == SUBDIR_PARSE || filename == NULL) {
538 filename = alloca(strlen(path) + sizeof(HTTPD_CONF) + 2);
539 sprintf((char *)filename, "%s/%s", path, HTTPD_CONF);
542 while ((f = fopen_for_read(filename)) == NULL) {
543 if (flag >= SUBDIR_PARSE) { /* SUBDIR or TRY_CURDIR */
544 /* config file not found, no changes to config */
547 if (flag == FIRST_PARSE) {
548 /* -c CONFFILE given, but CONFFILE doesn't exist? */
549 if (opt_c_configFile)
550 bb_simple_perror_msg_and_die(opt_c_configFile);
551 /* else: no -c, thus we looked at /etc/httpd.conf,
552 * and it's not there. try ./httpd.conf: */
554 flag = TRY_CURDIR_PARSE;
555 filename = HTTPD_CONF;
558 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
559 /* in "/file:user:pass" lines, we prepend path in subdirs */
560 if (flag != SUBDIR_PARSE)
565 * I:default_index_file
567 * [AD]:IP[/mask] # allow/deny, * for wildcard
568 * Ennn:error.html # error page for status nnn
569 * P:/url:[http://]hostname[:port]/new/path # reverse proxy
570 * .ext:mime/type # mime type
571 * *.php:/path/php # run xxx.php through an interpreter
572 * /file:user:pass # username and password
574 while (fgets(buf, sizeof(buf), f) != NULL) {
579 { /* remove all whitespace, and # comments */
583 /* skip non-whitespace beginning. Often the whole line
584 * is non-whitespace. We want this case to work fast,
585 * without needless copying, therefore we don't merge
586 * this operation into next while loop. */
587 while ((ch = *p0) != '\0' && ch != '\n' && ch != '#'
588 && ch != ' ' && ch != '\t'
593 /* if we enter this loop, we have some whitespace.
595 while (ch != '\0' && ch != '\n' && ch != '#') {
596 if (ch != ' ' && ch != '\t') {
602 strlen_buf = p - buf;
604 continue; /* empty line */
607 after_colon = strchr(buf, ':');
609 if (after_colon == NULL || *++after_colon == '\0')
612 ch = (buf[0] & ~0x20); /* toupper if it's a letter */
615 if (index_page != index_html)
616 free((char*)index_page);
617 index_page = xstrdup(after_colon);
621 /* do not allow jumping around using H in subdir's configs */
622 if (flag == FIRST_PARSE && ch == 'H') {
623 home_httpd = xstrdup(after_colon);
628 if (ch == 'A' || ch == 'D') {
631 if (*after_colon == '*') {
633 /* memorize "deny all" */
636 /* skip assumed "A:*", it is a default anyway */
639 /* store "allow/deny IP/mask" line */
640 pip = xzalloc(sizeof(*pip));
641 if (scan_ip_mask(after_colon, &pip->ip, &pip->mask)) {
642 /* IP{/mask} syntax error detected, protect all */
646 pip->allow_deny = ch;
648 /* Deny:from_IP - prepend */
652 /* A:from_IP - append (thus all D's precedes A's) */
653 Htaccess_IP *prev_IP = ip_a_d;
654 if (prev_IP == NULL) {
657 while (prev_IP->next)
658 prev_IP = prev_IP->next;
665 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
666 if (flag == FIRST_PARSE && ch == 'E') {
668 int status = atoi(buf + 1); /* error status code */
670 if (status < HTTP_CONTINUE) {
673 /* then error page; find matching status */
674 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
675 if (http_response_type[i] == status) {
676 /* We chdir to home_httpd, thus no need to
677 * concat_path_file(home_httpd, after_colon)
679 http_error_page[i] = xstrdup(after_colon);
687 #if ENABLE_FEATURE_HTTPD_PROXY
688 if (flag == FIRST_PARSE && ch == 'P') {
689 /* P:/url:[http://]hostname[:port]/new/path */
690 char *url_from, *host_port, *url_to;
691 Htaccess_Proxy *proxy_entry;
693 url_from = after_colon;
694 host_port = strchr(after_colon, ':');
695 if (host_port == NULL) {
699 if (strncmp(host_port, "http://", 7) == 0)
701 if (*host_port == '\0') {
704 url_to = strchr(host_port, '/');
705 if (url_to == NULL) {
709 proxy_entry = xzalloc(sizeof(*proxy_entry));
710 proxy_entry->url_from = xstrdup(url_from);
711 proxy_entry->host_port = xstrdup(host_port);
713 proxy_entry->url_to = xstrdup(url_to);
714 proxy_entry->next = proxy;
719 /* the rest of directives are non-alphabetic,
720 * must avoid using "toupper'ed" ch */
723 if (ch == '.' /* ".ext:mime/type" */
724 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
725 || (ch == '*' && buf[1] == '.') /* "*.php:/path/php" */
731 cur = xzalloc(sizeof(*cur) /* includes space for NUL */ + strlen_buf);
732 strcpy(cur->before_colon, buf);
733 p = cur->before_colon + (after_colon - buf);
735 cur->after_colon = p;
737 /* .mime line: prepend to mime_a list */
741 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
743 /* script interpreter line: prepend to script_i list */
744 cur->next = script_i;
751 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
752 if (ch == '/') { /* "/file:user:pass" */
757 /* note: path is "" unless we are in SUBDIR parse,
758 * otherwise it does NOT start with "/" */
759 cur = xzalloc(sizeof(*cur) /* includes space for NUL */
763 /* form "/path/file" */
764 sprintf(cur->before_colon, "/%s%.*s",
766 (int) (after_colon - buf - 1), /* includes "/", but not ":" */
768 /* canonicalize it */
769 p = bb_simplify_abs_path_inplace(cur->before_colon);
770 file_len = p - cur->before_colon;
771 /* add "user:pass" after NUL */
772 strcpy(++p, after_colon);
773 cur->after_colon = p;
775 /* insert cur into g_auth */
776 /* g_auth is sorted by decreased filename length */
778 Htaccess *auth, **authp;
781 while ((auth = *authp) != NULL) {
782 if (file_len >= strlen(auth->before_colon)) {
783 /* insert cur before auth */
793 #endif /* BASIC_AUTH */
795 /* the line is not recognized */
797 bb_error_msg("config error '%s' in '%s'", buf, filename);
798 } /* while (fgets) */
803 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
805 * Given a string, html-encode special characters.
806 * This is used for the -e command line option to provide an easy way
807 * for scripts to encode result data without confusing browsers. The
808 * returned string pointer is memory allocated by malloc().
810 * Returns a pointer to the encoded string (malloced).
812 static char *encodeString(const char *string)
814 /* take the simple route and encode everything */
815 /* could possibly scan once to get length. */
816 int len = strlen(string);
817 char *out = xmalloc(len * 6 + 1);
821 while ((ch = *string++) != '\0') {
822 /* very simple check for what to encode */
826 p += sprintf(p, "&#%d;", (unsigned char) ch);
833 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
835 * Decode a base64 data stream as per rfc1521.
836 * Note that the rfc states that non base64 chars are to be ignored.
837 * Since the decode always results in a shorter size than the input,
838 * it is OK to pass the input arg as an output arg.
839 * Parameter: a pointer to a base64 encoded string.
840 * Decoded data is stored in-place.
842 static void decodeBase64(char *Data)
844 const unsigned char *in = (const unsigned char *)Data;
845 /* The decoded size will be at most 3/4 the size of the encoded */
852 if (t >= '0' && t <= '9')
854 else if (t >= 'A' && t <= 'Z')
856 else if (t >= 'a' && t <= 'z')
870 *Data++ = (char) (ch >> 16);
871 *Data++ = (char) (ch >> 8);
881 * Create a listen server socket on the designated port.
883 static int openServer(void)
885 unsigned n = bb_strtou(bind_addr_or_port, NULL, 10);
886 if (!errno && n && n <= 0xffff)
887 n = create_and_bind_stream_or_die(NULL, n);
889 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
895 * Log the connection closure and exit.
897 static void log_and_exit(void) NORETURN;
898 static void log_and_exit(void)
900 /* Paranoia. IE said to be buggy. It may send some extra data
901 * or be confused by us just exiting without SHUT_WR. Oh well. */
902 shutdown(1, SHUT_WR);
904 (this also messes up stdin when user runs httpd -i from terminal)
906 while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0)
911 bb_error_msg("closed");
912 _exit(xfunc_error_retval);
916 * Create and send HTTP response headers.
917 * The arguments are combined and sent as one write operation. Note that
918 * IE will puke big-time if the headers are not sent in one packet and the
919 * second packet is delayed for any reason.
920 * responseNum - the result code to send.
922 static void send_headers(int responseNum)
924 static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
926 const char *responseString = "";
927 const char *infoString = NULL;
928 const char *mime_type;
929 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
930 const char *error_page = NULL;
933 time_t timer = time(NULL);
937 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
938 if (http_response_type[i] == responseNum) {
939 responseString = http_response[i].name;
940 infoString = http_response[i].info;
941 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
942 error_page = http_error_page[i];
947 /* error message is HTML */
948 mime_type = responseNum == HTTP_OK ?
949 found_mime_type : "text/html";
952 bb_error_msg("response:%u", responseNum);
954 /* emit the current date */
955 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
957 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
958 "Date: %s\r\nConnection: close\r\n",
959 responseNum, responseString, mime_type, tmp_str);
961 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
962 if (responseNum == HTTP_UNAUTHORIZED) {
963 len += sprintf(iobuf + len,
964 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
968 if (responseNum == HTTP_MOVED_TEMPORARILY) {
969 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
970 found_moved_temporarily,
971 (g_query ? "?" : ""),
972 (g_query ? g_query : ""));
975 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
976 if (error_page && access(error_page, R_OK) == 0) {
977 strcat(iobuf, "\r\n");
981 fprintf(stderr, "headers: '%s'\n", iobuf);
982 full_write(STDOUT_FILENO, iobuf, len);
984 fprintf(stderr, "writing error page: '%s'\n", error_page);
985 return send_file_and_exit(error_page, SEND_BODY);
989 if (file_size != -1) { /* file */
990 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
991 #if ENABLE_FEATURE_HTTPD_RANGES
992 if (responseNum == HTTP_PARTIAL_CONTENT) {
993 len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"u-%"OFF_FMT"u/%"OFF_FMT"u\r\n",
997 file_size = range_end - range_start + 1;
1000 len += sprintf(iobuf + len,
1001 #if ENABLE_FEATURE_HTTPD_RANGES
1002 "Accept-Ranges: bytes\r\n"
1004 "Last-Modified: %s\r\n%s %"OFF_FMT"u\r\n",
1006 content_gzip ? "Transfer-length:" : "Content-length:",
1012 len += sprintf(iobuf + len, "Content-Encoding: gzip\r\n");
1014 iobuf[len++] = '\r';
1015 iobuf[len++] = '\n';
1017 len += sprintf(iobuf + len,
1018 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
1019 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
1020 responseNum, responseString,
1021 responseNum, responseString, infoString);
1024 fprintf(stderr, "headers: '%s'\n", iobuf);
1025 if (full_write(STDOUT_FILENO, iobuf, len) != len) {
1027 bb_perror_msg("error");
1032 static void send_headers_and_exit(int responseNum) NORETURN;
1033 static void send_headers_and_exit(int responseNum)
1035 IF_FEATURE_HTTPD_GZIP(content_gzip = 0;)
1036 send_headers(responseNum);
1041 * Read from the socket until '\n' or EOF. '\r' chars are removed.
1042 * '\n' is replaced with NUL.
1043 * Return number of characters read or 0 if nothing is read
1044 * ('\r' and '\n' are not counted).
1045 * Data is returned in iobuf.
1047 static int get_line(void)
1052 alarm(HEADER_READ_TIMEOUT);
1055 hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1060 iobuf[count] = c = *hdr_ptr++;
1066 iobuf[count] = '\0';
1069 if (count < (IOBUF_SIZE - 1)) /* check overflow */
1075 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1077 /* gcc 4.2.1 fares better with NOINLINE */
1078 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN;
1079 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1081 enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1082 struct pollfd pfd[3];
1083 int out_cnt; /* we buffer a bit of initial CGI output */
1086 /* iobuf is used for CGI -> network data,
1087 * hdr_buf is for network -> CGI data (POSTDATA) */
1089 /* If CGI dies, we still want to correctly finish reading its output
1090 * and send it to the peer. So please no SIGPIPEs! */
1091 signal(SIGPIPE, SIG_IGN);
1093 // We inconsistently handle a case when more POSTDATA from network
1094 // is coming than we expected. We may give *some part* of that
1095 // extra data to CGI.
1097 //if (hdr_cnt > post_len) {
1098 // /* We got more POSTDATA from network than we expected */
1099 // hdr_cnt = post_len;
1101 post_len -= hdr_cnt;
1102 /* post_len - number of POST bytes not yet read from network */
1104 /* NB: breaking out of this loop jumps to log_and_exit() */
1107 memset(pfd, 0, sizeof(pfd));
1109 pfd[FROM_CGI].fd = fromCgi_rd;
1110 pfd[FROM_CGI].events = POLLIN;
1113 pfd[TO_CGI].fd = toCgi_wr;
1115 pfd[TO_CGI].events = POLLOUT;
1116 } else if (post_len > 0) {
1117 pfd[0].events = POLLIN;
1119 /* post_len <= 0 && hdr_cnt <= 0:
1120 * no more POST data to CGI,
1121 * let CGI see EOF on CGI's stdin */
1122 if (toCgi_wr != fromCgi_rd)
1128 /* Now wait on the set of sockets */
1129 count = safe_poll(pfd, toCgi_wr ? TO_CGI+1 : FROM_CGI+1, -1);
1132 if (safe_waitpid(pid, &status, WNOHANG) <= 0) {
1133 /* Weird. CGI didn't exit and no fd's
1134 * are ready, yet poll returned?! */
1137 if (DEBUG && WIFEXITED(status))
1138 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1139 if (DEBUG && WIFSIGNALED(status))
1140 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1145 if (pfd[TO_CGI].revents) {
1146 /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */
1147 /* Have data from peer and can write to CGI */
1148 count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1149 /* Doesn't happen, we dont use nonblocking IO here
1150 *if (count < 0 && errno == EAGAIN) {
1157 /* EOF/broken pipe to CGI, stop piping POST data */
1158 hdr_cnt = post_len = 0;
1162 if (pfd[0].revents) {
1163 /* post_len > 0 && hdr_cnt == 0 here */
1164 /* We expect data, prev data portion is eaten by CGI
1165 * and there *is* data to read from the peer
1167 //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
1168 //count = safe_read(STDIN_FILENO, hdr_buf, count);
1169 count = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1175 /* no more POST data can be read */
1180 if (pfd[FROM_CGI].revents) {
1181 /* There is something to read from CGI */
1184 /* Are we still buffering CGI output? */
1186 /* HTTP_200[] has single "\r\n" at the end.
1187 * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1188 * CGI scripts MUST send their own header terminated by
1189 * empty line, then data. That's why we have only one
1190 * <cr><lf> pair here. We will output "200 OK" line
1191 * if needed, but CGI still has to provide blank line
1192 * between header and body */
1194 /* Must use safe_read, not full_read, because
1195 * CGI may output a few first bytes and then wait
1196 * for POSTDATA without closing stdout.
1197 * With full_read we may wait here forever. */
1198 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1200 /* eof (or error) and there was no "HTTP",
1201 * so write it, then write received data */
1203 full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1);
1204 full_write(STDOUT_FILENO, rbuf, out_cnt);
1206 break; /* CGI stdout is closed, exiting */
1210 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1211 if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1212 /* send "HTTP/1.0 " */
1213 if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9)
1215 rbuf += 8; /* skip "Status: " */
1216 count = out_cnt - 8;
1217 out_cnt = -1; /* buffering off */
1218 } else if (out_cnt >= 4) {
1219 /* Did CGI add "HTTP"? */
1220 if (memcmp(rbuf, HTTP_200, 4) != 0) {
1221 /* there is no "HTTP", do it ourself */
1222 if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1226 if (!strstr(rbuf, "ontent-")) {
1227 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1229 * Counter-example of valid CGI without Content-type:
1230 * echo -en "HTTP/1.0 302 Found\r\n"
1231 * echo -en "Location: http://www.busybox.net\r\n"
1235 out_cnt = -1; /* buffering off */
1238 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1240 break; /* eof (or error) */
1242 if (full_write(STDOUT_FILENO, rbuf, count) != count)
1245 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1246 } /* if (pfd[FROM_CGI].revents) */
1252 #if ENABLE_FEATURE_HTTPD_CGI
1254 static void setenv1(const char *name, const char *value)
1256 setenv(name, value ? value : "", 1);
1260 * Spawn CGI script, forward CGI's stdin/out <=> network
1262 * Environment variables are set up and the script is invoked with pipes
1263 * for stdin/stdout. If a POST is being done the script is fed the POST
1264 * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1267 * const char *url The requested URL (with leading /).
1268 * const char *orig_uri The original URI before rewriting (if any)
1269 * int post_len Length of the POST body.
1270 * const char *cookie For set HTTP_COOKIE.
1271 * const char *content_type For set CONTENT_TYPE.
1273 static void send_cgi_and_exit(
1275 const char *orig_uri,
1276 const char *request,
1279 const char *content_type) NORETURN;
1280 static void send_cgi_and_exit(
1282 const char *orig_uri,
1283 const char *request,
1286 const char *content_type)
1288 struct fd_pair fromCgi; /* CGI -> httpd pipe */
1289 struct fd_pair toCgi; /* httpd -> CGI pipe */
1290 char *script, *last_slash;
1293 /* Make a copy. NB: caller guarantees:
1294 * url[0] == '/', url[1] != '/' */
1298 * We are mucking with environment _first_ and then vfork/exec,
1299 * this allows us to use vfork safely. Parent doesn't care about
1300 * these environment changes anyway.
1303 /* Check for [dirs/]script.cgi/PATH_INFO */
1304 last_slash = script = (char*)url;
1305 while ((script = strchr(script + 1, '/')) != NULL) {
1308 dir = is_directory(url + 1, /*followlinks:*/ 1);
1311 /* not directory, found script.cgi/PATH_INFO */
1314 /* is directory, find next '/' */
1315 last_slash = script;
1317 setenv1("PATH_INFO", script); /* set to /PATH_INFO or "" */
1318 setenv1("REQUEST_METHOD", request);
1320 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", orig_uri, g_query));
1322 setenv1("REQUEST_URI", orig_uri);
1325 *script = '\0'; /* cut off /PATH_INFO */
1327 /* SCRIPT_FILENAME is required by PHP in CGI mode */
1328 if (home_httpd[0] == '/') {
1329 char *fullpath = concat_path_file(home_httpd, url);
1330 setenv1("SCRIPT_FILENAME", fullpath);
1332 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1333 setenv1("SCRIPT_NAME", url);
1334 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1335 * QUERY_STRING: The information which follows the ? in the URL
1336 * which referenced this script. This is the query information.
1337 * It should not be decoded in any fashion. This variable
1338 * should always be set when there is query information,
1339 * regardless of command line decoding. */
1340 /* (Older versions of bbox seem to do some decoding) */
1341 setenv1("QUERY_STRING", g_query);
1342 putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1343 putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1344 putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1345 /* Having _separate_ variables for IP and port defeats
1346 * the purpose of having socket abstraction. Which "port"
1347 * are you using on Unix domain socket?
1348 * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1351 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1352 char *cp = strrchr(p, ':');
1353 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1355 if (cp) *cp = '\0'; /* delete :PORT */
1356 setenv1("REMOTE_ADDR", p);
1359 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1360 setenv1("REMOTE_PORT", cp + 1);
1364 setenv1("HTTP_USER_AGENT", user_agent);
1366 setenv1("HTTP_ACCEPT", http_accept);
1367 if (http_accept_language)
1368 setenv1("HTTP_ACCEPT_LANGUAGE", http_accept_language);
1370 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1372 setenv1("HTTP_COOKIE", cookie);
1374 setenv1("CONTENT_TYPE", content_type);
1375 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1377 setenv1("REMOTE_USER", remoteuser);
1378 putenv((char*)"AUTH_TYPE=Basic");
1382 setenv1("HTTP_REFERER", referer);
1383 setenv1("HTTP_HOST", host); /* set to "" if NULL */
1384 /* setenv1("SERVER_NAME", safe_gethostname()); - don't do this,
1385 * just run "env SERVER_NAME=xyz httpd ..." instead */
1387 xpiped_pair(fromCgi);
1392 /* TODO: log perror? */
1400 xfunc_error_retval = 242;
1402 /* NB: close _first_, then move fds! */
1405 xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */
1406 xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */
1407 /* User seeing stderr output can be a security problem.
1408 * If CGI really wants that, it can always do dup itself. */
1411 /* Chdiring to script's dir */
1412 script = last_slash;
1413 if (script != url) { /* paranoia */
1415 if (chdir(url + 1) != 0) {
1416 bb_perror_msg("chdir(%s)", url + 1);
1417 goto error_execing_cgi;
1419 // not needed: *script = '/';
1423 /* set argv[0] to name without path */
1427 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1429 char *suffix = strrchr(script, '.');
1433 for (cur = script_i; cur; cur = cur->next) {
1434 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1435 /* found interpreter name */
1436 argv[0] = cur->after_colon;
1445 /* restore default signal dispositions for CGI process */
1452 /* _NOT_ execvp. We do not search PATH. argv[0] is a filename
1453 * without any dir components and will only match a file
1454 * in the current directory */
1455 execv(argv[0], argv);
1457 bb_perror_msg("can't execute '%s'", argv[0]);
1460 * (we are CGI here, our stdout is pumped to the net) */
1461 send_headers_and_exit(HTTP_NOT_FOUND);
1464 /* Parent process */
1466 /* Restore variables possibly changed by child */
1467 xfunc_error_retval = 0;
1472 cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1475 #endif /* FEATURE_HTTPD_CGI */
1478 * Send a file response to a HTTP request, and exit
1481 * const char *url The requested URL (with leading /).
1482 * what What to send (headers/body/both).
1484 static NOINLINE void send_file_and_exit(const char *url, int what)
1491 /* does <url>.gz exist? Then use it instead */
1492 char *gzurl = xasprintf("%s.gz", url);
1493 fd = open(gzurl, O_RDONLY);
1498 file_size = sb.st_size;
1499 last_mod = sb.st_mtime;
1501 IF_FEATURE_HTTPD_GZIP(content_gzip = 0;)
1502 fd = open(url, O_RDONLY);
1505 fd = open(url, O_RDONLY);
1509 bb_perror_msg("can't open '%s'", url);
1510 /* Error pages are sent by using send_file_and_exit(SEND_BODY).
1511 * IOW: it is unsafe to call send_headers_and_exit
1512 * if what is SEND_BODY! Can recurse! */
1513 if (what != SEND_BODY)
1514 send_headers_and_exit(HTTP_NOT_FOUND);
1517 /* If you want to know about EPIPE below
1518 * (happens if you abort downloads from local httpd): */
1519 signal(SIGPIPE, SIG_IGN);
1521 /* If not found, default is "application/octet-stream" */
1522 found_mime_type = "application/octet-stream";
1523 suffix = strrchr(url, '.');
1525 static const char suffixTable[] ALIGN1 =
1526 /* Shorter suffix must be first:
1527 * ".html.htm" will fail for ".htm"
1529 ".txt.h.c.cc.cpp\0" "text/plain\0"
1530 /* .htm line must be after .h line */
1531 ".htm.html\0" "text/html\0"
1532 ".jpg.jpeg\0" "image/jpeg\0"
1533 ".gif\0" "image/gif\0"
1534 ".png\0" "image/png\0"
1535 /* .css line must be after .c line */
1536 ".css\0" "text/css\0"
1537 ".wav\0" "audio/wav\0"
1538 ".avi\0" "video/x-msvideo\0"
1539 ".qt.mov\0" "video/quicktime\0"
1540 ".mpe.mpeg\0" "video/mpeg\0"
1541 ".mid.midi\0" "audio/midi\0"
1542 ".mp3\0" "audio/mpeg\0"
1543 #if 0 /* unpopular */
1544 ".au\0" "audio/basic\0"
1545 ".pac\0" "application/x-ns-proxy-autoconfig\0"
1546 ".vrml.wrl\0" "model/vrml\0"
1548 /* compiler adds another "\0" here */
1552 /* Examine built-in table */
1553 const char *table = suffixTable;
1554 const char *table_next;
1555 for (; *table; table = table_next) {
1556 const char *try_suffix;
1557 const char *mime_type;
1558 mime_type = table + strlen(table) + 1;
1559 table_next = mime_type + strlen(mime_type) + 1;
1560 try_suffix = strstr(table, suffix);
1563 try_suffix += strlen(suffix);
1564 if (*try_suffix == '\0' || *try_suffix == '.') {
1565 found_mime_type = mime_type;
1568 /* Example: strstr(table, ".av") != NULL, but it
1569 * does not match ".avi" after all and we end up here.
1570 * The table is arranged so that in this case we know
1571 * that it can't match anything in the following lines,
1572 * and we stop the search: */
1575 /* ...then user's table */
1576 for (cur = mime_a; cur; cur = cur->next) {
1577 if (strcmp(cur->before_colon, suffix) == 0) {
1578 found_mime_type = cur->after_colon;
1585 bb_error_msg("sending file '%s' content-type: %s",
1586 url, found_mime_type);
1588 #if ENABLE_FEATURE_HTTPD_RANGES
1589 if (what == SEND_BODY /* err pages and ranges don't mix */
1590 || content_gzip /* we are sending compressed page: can't do ranges */ ///why?
1594 range_len = MAXINT(off_t);
1597 range_end = file_size - 1;
1599 if (range_end < range_start
1600 || lseek(fd, range_start, SEEK_SET) != range_start
1602 lseek(fd, 0, SEEK_SET);
1605 range_len = range_end - range_start + 1;
1606 send_headers(HTTP_PARTIAL_CONTENT);
1611 if (what & SEND_HEADERS)
1612 send_headers(HTTP_OK);
1613 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1615 off_t offset = range_start;
1617 /* sz is rounded down to 64k */
1618 ssize_t sz = MAXINT(ssize_t) - 0xffff;
1619 IF_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1620 count = sendfile(STDOUT_FILENO, fd, &offset, sz);
1622 if (offset == range_start)
1623 break; /* fall back to read/write loop */
1626 IF_FEATURE_HTTPD_RANGES(range_len -= sz;)
1627 if (count == 0 || range_len == 0)
1632 while ((count = safe_read(fd, iobuf, IOBUF_SIZE)) > 0) {
1634 IF_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1635 n = full_write(STDOUT_FILENO, iobuf, count);
1638 IF_FEATURE_HTTPD_RANGES(range_len -= count;)
1643 IF_FEATURE_HTTPD_USE_SENDFILE(fin:)
1645 bb_perror_msg("error");
1650 static int checkPermIP(void)
1654 for (cur = ip_a_d; cur; cur = cur->next) {
1657 "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1659 (unsigned char)(cur->ip >> 24),
1660 (unsigned char)(cur->ip >> 16),
1661 (unsigned char)(cur->ip >> 8),
1662 (unsigned char)(cur->ip),
1663 (unsigned char)(cur->mask >> 24),
1664 (unsigned char)(cur->mask >> 16),
1665 (unsigned char)(cur->mask >> 8),
1666 (unsigned char)(cur->mask)
1669 if ((rmt_ip & cur->mask) == cur->ip)
1670 return (cur->allow_deny == 'A'); /* A -> 1 */
1673 return !flg_deny_all; /* depends on whether we saw "D:*" */
1676 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1678 # if ENABLE_FEATURE_HTTPD_AUTH_MD5 && ENABLE_PAM
1679 struct pam_userinfo {
1684 static int pam_talker(int num_msg,
1685 const struct pam_message **msg,
1686 struct pam_response **resp,
1690 struct pam_userinfo *userinfo = (struct pam_userinfo *) appdata_ptr;
1691 struct pam_response *response;
1693 if (!resp || !msg || !userinfo)
1694 return PAM_CONV_ERR;
1696 /* allocate memory to store response */
1697 response = xzalloc(num_msg * sizeof(*response));
1700 for (i = 0; i < num_msg; i++) {
1703 switch (msg[i]->msg_style) {
1704 case PAM_PROMPT_ECHO_ON:
1707 case PAM_PROMPT_ECHO_OFF:
1716 return PAM_CONV_ERR;
1718 response[i].resp = xstrdup(s);
1719 if (PAM_SUCCESS != 0)
1720 response[i].resp_retcode = PAM_SUCCESS;
1728 * Config file entries are of the form "/<path>:<user>:<passwd>".
1729 * If config file has no prefix match for path, access is allowed.
1731 * path The file path
1732 * user_and_passwd "user:passwd" to validate
1734 * Returns 1 if user_and_passwd is OK.
1736 static int check_user_passwd(const char *path, char *user_and_passwd)
1739 const char *prev = NULL;
1741 for (cur = g_auth; cur; cur = cur->next) {
1742 const char *dir_prefix;
1746 dir_prefix = cur->before_colon;
1749 /* If already saw a match, don't accept other different matches */
1750 if (prev && strcmp(prev, dir_prefix) != 0)
1754 fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd);
1756 /* If it's not a prefix match, continue searching */
1757 len = strlen(dir_prefix);
1758 if (len != 1 /* dir_prefix "/" matches all, don't need to check */
1759 && (strncmp(dir_prefix, path, len) != 0
1760 || (path[len] != '/' && path[len] != '\0')
1766 /* Path match found */
1769 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1770 char *colon_after_user;
1772 # if ENABLE_FEATURE_SHADOWPASSWDS && !ENABLE_PAM
1776 colon_after_user = strchr(user_and_passwd, ':');
1777 if (!colon_after_user)
1780 /* compare "user:" */
1781 if (cur->after_colon[0] != '*'
1782 && strncmp(cur->after_colon, user_and_passwd,
1783 colon_after_user - user_and_passwd + 1) != 0
1787 /* this cfg entry is '*' or matches username from peer */
1789 passwd = strchr(cur->after_colon, ':');
1793 if (passwd[0] == '*') {
1795 struct pam_userinfo userinfo;
1796 struct pam_conv conv_info = { &pam_talker, (void *) &userinfo };
1799 *colon_after_user = '\0';
1800 userinfo.name = user_and_passwd;
1801 userinfo.pw = colon_after_user + 1;
1802 r = pam_start("httpd", user_and_passwd, &conv_info, &pamh) != PAM_SUCCESS;
1804 r = pam_authenticate(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS
1805 || pam_acct_mgmt(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS
1807 pam_end(pamh, PAM_SUCCESS);
1809 *colon_after_user = ':';
1810 goto end_check_passwd;
1812 # if ENABLE_FEATURE_SHADOWPASSWDS
1813 /* Using _r function to avoid pulling in static buffers */
1818 *colon_after_user = '\0';
1819 pw = getpwnam(user_and_passwd);
1820 *colon_after_user = ':';
1821 if (!pw || !pw->pw_passwd)
1823 passwd = pw->pw_passwd;
1824 # if ENABLE_FEATURE_SHADOWPASSWDS
1825 if ((passwd[0] == 'x' || passwd[0] == '*') && !passwd[1]) {
1826 /* getspnam_r may return 0 yet set result to NULL.
1827 * At least glibc 2.4 does this. Be extra paranoid here. */
1828 struct spwd *result = NULL;
1829 r = getspnam_r(pw->pw_name, &spw, sp_buf, sizeof(sp_buf), &result);
1830 if (r == 0 && result)
1831 passwd = result->sp_pwdp;
1834 /* In this case, passwd is ALWAYS encrypted:
1835 * it came from /etc/passwd or /etc/shadow!
1837 goto check_encrypted;
1838 # endif /* ENABLE_PAM */
1840 /* Else: passwd is from httpd.conf, it is either plaintext or encrypted */
1842 if (passwd[0] == '$' && isdigit(passwd[1])) {
1845 /* encrypt pwd from peer and check match with local one */
1846 encrypted = pw_encrypt(
1847 /* pwd (from peer): */ colon_after_user + 1,
1851 r = strcmp(encrypted, passwd);
1854 /* local passwd is from httpd.conf and it's plaintext */
1855 r = strcmp(colon_after_user + 1, passwd);
1857 goto end_check_passwd;
1860 /* Comparing plaintext "user:pass" in one go */
1861 r = strcmp(cur->after_colon, user_and_passwd);
1864 remoteuser = xstrndup(user_and_passwd,
1865 strchrnul(user_and_passwd, ':') - user_and_passwd
1871 /* 0(bad) if prev is set: matches were found but passwd was wrong */
1872 return (prev == NULL);
1874 #endif /* FEATURE_HTTPD_BASIC_AUTH */
1876 #if ENABLE_FEATURE_HTTPD_PROXY
1877 static Htaccess_Proxy *find_proxy_entry(const char *url)
1880 for (p = proxy; p; p = p->next) {
1881 if (strncmp(url, p->url_from, strlen(p->url_from)) == 0)
1891 static void send_REQUEST_TIMEOUT_and_exit(int sig) NORETURN;
1892 static void send_REQUEST_TIMEOUT_and_exit(int sig UNUSED_PARAM)
1894 send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1898 * Handle an incoming http request and exit.
1900 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN;
1901 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1903 static const char request_GET[] ALIGN1 = "GET";
1908 #if ENABLE_FEATURE_HTTPD_CGI
1909 static const char request_HEAD[] ALIGN1 = "HEAD";
1910 const char *prequest;
1911 char *cookie = NULL;
1912 char *content_type = NULL;
1913 unsigned long length = 0;
1914 #elif ENABLE_FEATURE_HTTPD_PROXY
1915 #define prequest request_GET
1916 unsigned long length = 0;
1918 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1919 smallint authorized = -1;
1921 smallint ip_allowed;
1922 char http_major_version;
1923 #if ENABLE_FEATURE_HTTPD_PROXY
1924 char http_minor_version;
1925 char *header_buf = header_buf; /* for gcc */
1926 char *header_ptr = header_ptr;
1927 Htaccess_Proxy *proxy_entry;
1930 /* Allocation of iobuf is postponed until now
1931 * (IOW, server process doesn't need to waste 8k) */
1932 iobuf = xmalloc(IOBUF_SIZE);
1935 if (fromAddr->u.sa.sa_family == AF_INET) {
1936 rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr);
1938 #if ENABLE_FEATURE_IPV6
1939 if (fromAddr->u.sa.sa_family == AF_INET6
1940 && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0
1941 && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0
1942 && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1943 rmt_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]);
1945 if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1946 /* NB: can be NULL (user runs httpd -i by hand?) */
1947 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa);
1950 /* this trick makes -v logging much simpler */
1952 applet_name = rmt_ip_str;
1954 bb_error_msg("connected");
1957 /* Install timeout handler. get_line() needs it. */
1958 signal(SIGALRM, send_REQUEST_TIMEOUT_and_exit);
1960 if (!get_line()) /* EOF or error or empty line */
1961 send_headers_and_exit(HTTP_BAD_REQUEST);
1963 /* Determine type of request (GET/POST) */
1964 urlp = strpbrk(iobuf, " \t");
1966 send_headers_and_exit(HTTP_BAD_REQUEST);
1968 #if ENABLE_FEATURE_HTTPD_CGI
1969 prequest = request_GET;
1970 if (strcasecmp(iobuf, prequest) != 0) {
1971 prequest = request_HEAD;
1972 if (strcasecmp(iobuf, prequest) != 0) {
1974 if (strcasecmp(iobuf, prequest) != 0)
1975 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1979 if (strcasecmp(iobuf, request_GET) != 0)
1980 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1982 urlp = skip_whitespace(urlp);
1984 send_headers_and_exit(HTTP_BAD_REQUEST);
1986 /* Find end of URL and parse HTTP version, if any */
1987 http_major_version = '0';
1988 IF_FEATURE_HTTPD_PROXY(http_minor_version = '0';)
1989 tptr = strchrnul(urlp, ' ');
1990 /* Is it " HTTP/"? */
1991 if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) {
1992 http_major_version = tptr[6];
1993 IF_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];)
1997 /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
1998 urlcopy = alloca((tptr - urlp) + 2 + strlen(index_page));
1999 /*if (urlcopy == NULL)
2000 * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
2001 strcpy(urlcopy, urlp);
2002 /* NB: urlcopy ptr is never changed after this */
2004 /* Extract url args if present */
2005 /* g_query = NULL; - already is */
2006 tptr = strchr(urlcopy, '?');
2012 /* Decode URL escape sequences */
2013 tptr = percent_decode_in_place(urlcopy, /*strict:*/ 1);
2015 send_headers_and_exit(HTTP_BAD_REQUEST);
2016 if (tptr == urlcopy + 1) {
2017 /* '/' or NUL is encoded */
2018 send_headers_and_exit(HTTP_NOT_FOUND);
2021 /* Canonicalize path */
2022 /* Algorithm stolen from libbb bb_simplify_path(),
2023 * but don't strdup, retain trailing slash, protect root */
2024 urlp = tptr = urlcopy;
2027 /* skip duplicate (or initial) slash */
2032 if (tptr[1] == '.' && (tptr[2] == '/' || tptr[2] == '\0')) {
2033 /* "..": be careful */
2035 if (urlp == urlcopy)
2036 send_headers_and_exit(HTTP_BAD_REQUEST);
2037 /* omit previous dir */
2038 while (*--urlp != '/')
2040 /* skip to "./" or ".<NUL>" */
2043 if (tptr[1] == '/' || tptr[1] == '\0') {
2044 /* skip extra "/./" */
2056 /* If URL is a directory, add '/' */
2057 if (urlp[-1] != '/') {
2058 if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) {
2059 found_moved_temporarily = urlcopy;
2065 bb_error_msg("url:%s", urlcopy);
2068 ip_allowed = checkPermIP();
2069 while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
2070 /* have path1/path2 */
2072 if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) {
2073 /* may have subdir config */
2074 parse_conf(urlcopy + 1, SUBDIR_PARSE);
2075 ip_allowed = checkPermIP();
2080 #if ENABLE_FEATURE_HTTPD_PROXY
2081 proxy_entry = find_proxy_entry(urlcopy);
2083 header_buf = header_ptr = xmalloc(IOBUF_SIZE);
2086 if (http_major_version >= '0') {
2087 /* Request was with "... HTTP/nXXX", and n >= 0 */
2089 /* Read until blank line */
2092 break; /* EOF or error or empty line */
2094 bb_error_msg("header: '%s'", iobuf);
2096 #if ENABLE_FEATURE_HTTPD_PROXY
2097 /* We need 2 more bytes for yet another "\r\n" -
2098 * see near fdprintf(proxy_fd...) further below */
2099 if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) {
2100 int len = strlen(iobuf);
2101 if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4)
2102 len = IOBUF_SIZE - (header_ptr - header_buf) - 4;
2103 memcpy(header_ptr, iobuf, len);
2105 header_ptr[0] = '\r';
2106 header_ptr[1] = '\n';
2111 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
2112 /* Try and do our best to parse more lines */
2113 if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
2114 /* extra read only for POST */
2115 if (prequest != request_GET
2116 # if ENABLE_FEATURE_HTTPD_CGI
2117 && prequest != request_HEAD
2120 tptr = skip_whitespace(iobuf + sizeof("Content-length:") - 1);
2122 send_headers_and_exit(HTTP_BAD_REQUEST);
2123 /* not using strtoul: it ignores leading minus! */
2124 length = bb_strtou(tptr, NULL, 10);
2125 /* length is "ulong", but we need to pass it to int later */
2126 if (errno || length > INT_MAX)
2127 send_headers_and_exit(HTTP_BAD_REQUEST);
2131 #if ENABLE_FEATURE_HTTPD_CGI
2132 else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
2133 cookie = xstrdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
2134 } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
2135 content_type = xstrdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
2136 } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
2137 referer = xstrdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
2138 } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
2139 user_agent = xstrdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
2140 } else if (STRNCASECMP(iobuf, "Host:") == 0) {
2141 host = xstrdup(skip_whitespace(iobuf + sizeof("Host:")-1));
2142 } else if (STRNCASECMP(iobuf, "Accept:") == 0) {
2143 http_accept = xstrdup(skip_whitespace(iobuf + sizeof("Accept:")-1));
2144 } else if (STRNCASECMP(iobuf, "Accept-Language:") == 0) {
2145 http_accept_language = xstrdup(skip_whitespace(iobuf + sizeof("Accept-Language:")-1));
2148 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2149 if (STRNCASECMP(iobuf, "Authorization:") == 0) {
2150 /* We only allow Basic credentials.
2151 * It shows up as "Authorization: Basic <user>:<passwd>" where
2152 * "<user>:<passwd>" is base64 encoded.
2154 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
2155 if (STRNCASECMP(tptr, "Basic") != 0)
2157 tptr += sizeof("Basic")-1;
2158 /* decodeBase64() skips whitespace itself */
2160 authorized = check_user_passwd(urlcopy, tptr);
2163 #if ENABLE_FEATURE_HTTPD_RANGES
2164 if (STRNCASECMP(iobuf, "Range:") == 0) {
2165 /* We know only bytes=NNN-[MMM] */
2166 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
2167 if (strncmp(s, "bytes=", 6) == 0) {
2168 s += sizeof("bytes=")-1;
2169 range_start = BB_STRTOOFF(s, &s, 10);
2170 if (s[0] != '-' || range_start < 0) {
2173 range_end = BB_STRTOOFF(s+1, NULL, 10);
2174 if (errno || range_end < range_start)
2180 #if ENABLE_FEATURE_HTTPD_GZIP
2181 if (STRNCASECMP(iobuf, "Accept-Encoding:") == 0) {
2182 /* Note: we do not support "gzip;q=0"
2183 * method of _disabling_ gzip
2184 * delivery. No one uses that, though */
2185 const char *s = strstr(iobuf, "gzip");
2187 // want more thorough checks?
2197 } /* while extra header reading */
2200 /* We are done reading headers, disable peer timeout */
2203 if (strcmp(bb_basename(urlcopy), HTTPD_CONF) == 0 || !ip_allowed) {
2204 /* protect listing [/path]/httpd.conf or IP deny */
2205 send_headers_and_exit(HTTP_FORBIDDEN);
2208 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2209 /* Case: no "Authorization:" was seen, but page might require passwd.
2210 * Check that with dummy user:pass */
2212 authorized = check_user_passwd(urlcopy, (char *) "");
2214 send_headers_and_exit(HTTP_UNAUTHORIZED);
2217 if (found_moved_temporarily) {
2218 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
2221 #if ENABLE_FEATURE_HTTPD_PROXY
2222 if (proxy_entry != NULL) {
2224 len_and_sockaddr *lsa;
2226 proxy_fd = socket(AF_INET, SOCK_STREAM, 0);
2228 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2229 lsa = host2sockaddr(proxy_entry->host_port, 80);
2231 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2232 if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0)
2233 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2234 fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n",
2235 prequest, /* GET or POST */
2236 proxy_entry->url_to, /* url part 1 */
2237 urlcopy + strlen(proxy_entry->url_from), /* url part 2 */
2238 (g_query ? "?" : ""), /* "?" (maybe) */
2239 (g_query ? g_query : ""), /* query string (maybe) */
2240 http_major_version, http_minor_version);
2241 header_ptr[0] = '\r';
2242 header_ptr[1] = '\n';
2244 write(proxy_fd, header_buf, header_ptr - header_buf);
2245 free(header_buf); /* on the order of 8k, free it */
2246 cgi_io_loop_and_exit(proxy_fd, proxy_fd, length);
2250 tptr = urlcopy + 1; /* skip first '/' */
2252 #if ENABLE_FEATURE_HTTPD_CGI
2253 if (strncmp(tptr, "cgi-bin/", 8) == 0) {
2254 if (tptr[8] == '\0') {
2255 /* protect listing "cgi-bin/" */
2256 send_headers_and_exit(HTTP_FORBIDDEN);
2258 send_cgi_and_exit(urlcopy, urlcopy, prequest, length, cookie, content_type);
2262 if (urlp[-1] == '/') {
2263 /* When index_page string is appended to <dir>/ URL, it overwrites
2264 * the query string. If we fall back to call /cgi-bin/index.cgi,
2265 * query string would be lost and not available to the CGI.
2266 * Work around it by making a deep copy.
2268 if (ENABLE_FEATURE_HTTPD_CGI)
2269 g_query = xstrdup(g_query); /* ok for NULL too */
2270 strcpy(urlp, index_page);
2272 if (stat(tptr, &sb) == 0) {
2273 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
2274 char *suffix = strrchr(tptr, '.');
2277 for (cur = script_i; cur; cur = cur->next) {
2278 if (strcmp(cur->before_colon + 1, suffix) == 0) {
2279 send_cgi_and_exit(urlcopy, urlcopy, prequest, length, cookie, content_type);
2284 file_size = sb.st_size;
2285 last_mod = sb.st_mtime;
2287 #if ENABLE_FEATURE_HTTPD_CGI
2288 else if (urlp[-1] == '/') {
2289 /* It's a dir URL and there is no index.html
2290 * Try cgi-bin/index.cgi */
2291 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
2292 urlp[0] = '\0'; /* remove index_page */
2293 send_cgi_and_exit("/cgi-bin/index.cgi", urlcopy, prequest, length, cookie, content_type);
2296 /* else fall through to send_file, it errors out if open fails: */
2298 if (prequest != request_GET && prequest != request_HEAD) {
2299 /* POST for files does not make sense */
2300 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2302 send_file_and_exit(tptr,
2303 (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS)
2306 send_file_and_exit(tptr, SEND_HEADERS_AND_BODY);
2311 * The main http server function.
2312 * Given a socket, listen for new connections and farm out
2313 * the processing as a [v]forked process.
2317 static void mini_httpd(int server_socket) NORETURN;
2318 static void mini_httpd(int server_socket)
2320 /* NB: it's best to not use xfuncs in this loop before fork().
2321 * Otherwise server may die on transient errors (temporary
2322 * out-of-memory condition, etc), which is Bad(tm).
2323 * Try to do any dangerous calls after fork.
2327 len_and_sockaddr fromAddr;
2329 /* Wait for connections... */
2330 fromAddr.len = LSA_SIZEOF_SA;
2331 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2335 /* set the KEEPALIVE option to cull dead connections */
2336 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2340 /* Do not reload config on HUP */
2341 signal(SIGHUP, SIG_IGN);
2342 close(server_socket);
2346 handle_incoming_and_exit(&fromAddr);
2348 /* parent, or fork failed */
2354 static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN;
2355 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2357 char *argv_copy[argc + 2];
2359 argv_copy[0] = argv[0];
2360 argv_copy[1] = (char*)"-i";
2361 memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2363 /* NB: it's best to not use xfuncs in this loop before vfork().
2364 * Otherwise server may die on transient errors (temporary
2365 * out-of-memory condition, etc), which is Bad(tm).
2366 * Try to do any dangerous calls after fork.
2370 len_and_sockaddr fromAddr;
2372 /* Wait for connections... */
2373 fromAddr.len = LSA_SIZEOF_SA;
2374 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2378 /* set the KEEPALIVE option to cull dead connections */
2379 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2383 /* Do not reload config on HUP */
2384 signal(SIGHUP, SIG_IGN);
2385 close(server_socket);
2389 /* Run a copy of ourself in inetd mode */
2392 argv_copy[0][0] &= 0x7f;
2393 /* parent, or vfork failed */
2401 * Process a HTTP connection on stdin/out.
2404 static void mini_httpd_inetd(void) NORETURN;
2405 static void mini_httpd_inetd(void)
2407 len_and_sockaddr fromAddr;
2409 memset(&fromAddr, 0, sizeof(fromAddr));
2410 fromAddr.len = LSA_SIZEOF_SA;
2411 /* NB: can fail if user runs it by hand and types in http cmds */
2412 getpeername(0, &fromAddr.u.sa, &fromAddr.len);
2413 handle_incoming_and_exit(&fromAddr);
2416 static void sighup_handler(int sig UNUSED_PARAM)
2418 parse_conf(DEFAULT_PATH_HTTPD_CONF, SIGNALED_PARSE);
2422 c_opt_config_file = 0,
2425 IF_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2426 IF_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,)
2427 IF_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,)
2428 IF_FEATURE_HTTPD_SETUID( u_opt_setuid ,)
2433 OPT_CONFIG_FILE = 1 << c_opt_config_file,
2434 OPT_DECODE_URL = 1 << d_opt_decode_url,
2435 OPT_HOME_HTTPD = 1 << h_opt_home_httpd,
2436 OPT_ENCODE_URL = IF_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2437 OPT_REALM = IF_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0,
2438 OPT_MD5 = IF_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0,
2439 OPT_SETUID = IF_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0,
2440 OPT_PORT = 1 << p_opt_port,
2441 OPT_INETD = 1 << p_opt_inetd,
2442 OPT_FOREGROUND = 1 << p_opt_foreground,
2443 OPT_VERBOSE = 1 << p_opt_verbose,
2447 int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2448 int httpd_main(int argc UNUSED_PARAM, char **argv)
2450 int server_socket = server_socket; /* for gcc */
2452 char *url_for_decode;
2453 IF_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2454 IF_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2455 IF_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2456 IF_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2460 #if ENABLE_LOCALE_SUPPORT
2461 /* Undo busybox.c: we want to speak English in http (dates etc) */
2462 setlocale(LC_TIME, "C");
2465 home_httpd = xrealloc_getcwd_or_warn(NULL);
2466 /* -v counts, -i implies -f */
2467 opt_complementary = "vv:if";
2468 /* We do not "absolutize" path given by -h (home) opt.
2469 * If user gives relative path in -h,
2470 * $SCRIPT_FILENAME will not be set. */
2471 opt = getopt32(argv, "c:d:h:"
2472 IF_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2473 IF_FEATURE_HTTPD_BASIC_AUTH("r:")
2474 IF_FEATURE_HTTPD_AUTH_MD5("m:")
2475 IF_FEATURE_HTTPD_SETUID("u:")
2477 &opt_c_configFile, &url_for_decode, &home_httpd
2478 IF_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2479 IF_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2480 IF_FEATURE_HTTPD_AUTH_MD5(, &pass)
2481 IF_FEATURE_HTTPD_SETUID(, &s_ugid)
2482 , &bind_addr_or_port
2485 if (opt & OPT_DECODE_URL) {
2486 fputs(percent_decode_in_place(url_for_decode, /*strict:*/ 0), stdout);
2489 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2490 if (opt & OPT_ENCODE_URL) {
2491 fputs(encodeString(url_for_encode), stdout);
2495 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2496 if (opt & OPT_MD5) {
2497 char salt[sizeof("$1$XXXXXXXX")];
2501 crypt_make_salt(salt + 3, 4);
2502 puts(pw_encrypt(pass, salt, /*cleanup:*/ 0));
2506 #if ENABLE_FEATURE_HTTPD_SETUID
2507 if (opt & OPT_SETUID) {
2508 xget_uidgid(&ugid, s_ugid);
2513 if (!(opt & OPT_FOREGROUND)) {
2514 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2519 if (!(opt & OPT_INETD)) {
2520 signal(SIGCHLD, SIG_IGN);
2521 server_socket = openServer();
2522 #if ENABLE_FEATURE_HTTPD_SETUID
2523 /* drop privileges */
2524 if (opt & OPT_SETUID) {
2525 if (ugid.gid != (gid_t)-1) {
2526 if (setgroups(1, &ugid.gid) == -1)
2527 bb_perror_msg_and_die("setgroups");
2536 /* User can do it himself: 'env - PATH="$PATH" httpd'
2537 * We don't do it because we don't want to screw users
2539 * 'env - VAR1=val1 VAR2=val2 httpd'
2540 * and have VAR1 and VAR2 values visible in their CGIs.
2541 * Besides, it is also smaller. */
2543 char *p = getenv("PATH");
2544 /* env strings themself are not freed, no need to xstrdup(p): */
2548 // if (!(opt & OPT_INETD))
2549 // setenv_long("SERVER_PORT", ???);
2553 parse_conf(DEFAULT_PATH_HTTPD_CONF, FIRST_PARSE);
2554 if (!(opt & OPT_INETD))
2555 signal(SIGHUP, sighup_handler);
2557 xfunc_error_retval = 0;
2558 if (opt & OPT_INETD)
2561 if (!(opt & OPT_FOREGROUND))
2562 bb_daemonize(0); /* don't change current directory */
2563 mini_httpd(server_socket); /* never returns */
2565 mini_httpd_nommu(server_socket, argc, argv); /* never returns */