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_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 IF_FEATURE_HTTPD_RANGES(range_start = -1;) \
374 bind_addr_or_port = "80"; \
375 index_page = index_html; \
380 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
384 SEND_HEADERS = (1 << 0),
385 SEND_BODY = (1 << 1),
386 SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY,
388 static void send_file_and_exit(const char *url, int what) NORETURN;
390 static void free_llist(has_next_ptr **pptr)
392 has_next_ptr *cur = *pptr;
394 has_next_ptr *t = cur;
401 static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
403 free_llist((has_next_ptr**)pptr);
406 static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
408 free_llist((has_next_ptr**)pptr);
411 /* Returns presumed mask width in bits or < 0 on error.
412 * Updates strp, stores IP at provided pointer */
413 static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
415 const char *p = *strp;
423 for (j = 0; j < 4; j++) {
426 if ((*p < '0' || *p > '9') && *p != '/' && *p)
429 while (*p >= '0' && *p <= '9') {
440 ip = (ip << 8) | octet;
454 /* Returns 0 on success. Stores IP and mask at provided pointers */
455 static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
461 i = scan_ip(&str, ipp, '/');
466 /* there is /xxx after dotted-IP address */
467 i = bb_strtou(str, &p, 10);
469 /* 'xxx' itself is dotted-IP mask, parse it */
470 /* (return 0 (success) only if it has N.N.N.N form) */
471 return scan_ip(&str, maskp, '\0') - 32;
480 if (sizeof(unsigned) == 4 && i == 32) {
481 /* mask >>= 32 below may not work */
487 /* i == 0 -> *maskp = 0x00000000
488 * i == 1 -> *maskp = 0x80000000
489 * i == 4 -> *maskp = 0xf0000000
490 * i == 31 -> *maskp = 0xfffffffe
491 * i == 32 -> *maskp = 0xffffffff */
492 *maskp = (uint32_t)(~mask);
497 * Parse configuration file into in-memory linked list.
499 * Any previous IP rules are discarded.
500 * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
501 * are also discarded. That is, previous settings are retained if flag is
503 * Error pages are only parsed on the main config file.
505 * path Path where to look for httpd.conf (without filename).
506 * flag Type of the parse request.
510 FIRST_PARSE = 0, /* path will be "/etc" */
511 SIGNALED_PARSE = 1, /* path will be "/etc" */
512 SUBDIR_PARSE = 2, /* path will be derived from URL */
514 static void parse_conf(const char *path, int flag)
516 /* internally used extra flag state */
517 enum { TRY_CURDIR_PARSE = 3 };
520 const char *filename;
523 /* discard old rules */
524 free_Htaccess_IP_list(&ip_a_d);
526 /* retain previous auth and mime config only for subdir parse */
527 if (flag != SUBDIR_PARSE) {
528 free_Htaccess_list(&mime_a);
529 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
530 free_Htaccess_list(&g_auth);
532 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
533 free_Htaccess_list(&script_i);
537 filename = opt_c_configFile;
538 if (flag == SUBDIR_PARSE || filename == NULL) {
539 filename = alloca(strlen(path) + sizeof(HTTPD_CONF) + 2);
540 sprintf((char *)filename, "%s/%s", path, HTTPD_CONF);
543 while ((f = fopen_for_read(filename)) == NULL) {
544 if (flag >= SUBDIR_PARSE) { /* SUBDIR or TRY_CURDIR */
545 /* config file not found, no changes to config */
548 if (flag == FIRST_PARSE) {
549 /* -c CONFFILE given, but CONFFILE doesn't exist? */
550 if (opt_c_configFile)
551 bb_simple_perror_msg_and_die(opt_c_configFile);
552 /* else: no -c, thus we looked at /etc/httpd.conf,
553 * and it's not there. try ./httpd.conf: */
555 flag = TRY_CURDIR_PARSE;
556 filename = HTTPD_CONF;
559 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
560 /* in "/file:user:pass" lines, we prepend path in subdirs */
561 if (flag != SUBDIR_PARSE)
566 * I:default_index_file
568 * [AD]:IP[/mask] # allow/deny, * for wildcard
569 * Ennn:error.html # error page for status nnn
570 * P:/url:[http://]hostname[:port]/new/path # reverse proxy
571 * .ext:mime/type # mime type
572 * *.php:/path/php # run xxx.php through an interpreter
573 * /file:user:pass # username and password
575 while (fgets(buf, sizeof(buf), f) != NULL) {
580 { /* remove all whitespace, and # comments */
584 /* skip non-whitespace beginning. Often the whole line
585 * is non-whitespace. We want this case to work fast,
586 * without needless copying, therefore we don't merge
587 * this operation into next while loop. */
588 while ((ch = *p0) != '\0' && ch != '\n' && ch != '#'
589 && ch != ' ' && ch != '\t'
594 /* if we enter this loop, we have some whitespace.
596 while (ch != '\0' && ch != '\n' && ch != '#') {
597 if (ch != ' ' && ch != '\t') {
603 strlen_buf = p - buf;
605 continue; /* empty line */
608 after_colon = strchr(buf, ':');
610 if (after_colon == NULL || *++after_colon == '\0')
613 ch = (buf[0] & ~0x20); /* toupper if it's a letter */
616 if (index_page != index_html)
617 free((char*)index_page);
618 index_page = xstrdup(after_colon);
622 /* do not allow jumping around using H in subdir's configs */
623 if (flag == FIRST_PARSE && ch == 'H') {
624 home_httpd = xstrdup(after_colon);
629 if (ch == 'A' || ch == 'D') {
632 if (*after_colon == '*') {
634 /* memorize "deny all" */
637 /* skip assumed "A:*", it is a default anyway */
640 /* store "allow/deny IP/mask" line */
641 pip = xzalloc(sizeof(*pip));
642 if (scan_ip_mask(after_colon, &pip->ip, &pip->mask)) {
643 /* IP{/mask} syntax error detected, protect all */
647 pip->allow_deny = ch;
649 /* Deny:from_IP - prepend */
653 /* A:from_IP - append (thus all D's precedes A's) */
654 Htaccess_IP *prev_IP = ip_a_d;
655 if (prev_IP == NULL) {
658 while (prev_IP->next)
659 prev_IP = prev_IP->next;
666 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
667 if (flag == FIRST_PARSE && ch == 'E') {
669 int status = atoi(buf + 1); /* error status code */
671 if (status < HTTP_CONTINUE) {
674 /* then error page; find matching status */
675 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
676 if (http_response_type[i] == status) {
677 /* We chdir to home_httpd, thus no need to
678 * concat_path_file(home_httpd, after_colon)
680 http_error_page[i] = xstrdup(after_colon);
688 #if ENABLE_FEATURE_HTTPD_PROXY
689 if (flag == FIRST_PARSE && ch == 'P') {
690 /* P:/url:[http://]hostname[:port]/new/path */
691 char *url_from, *host_port, *url_to;
692 Htaccess_Proxy *proxy_entry;
694 url_from = after_colon;
695 host_port = strchr(after_colon, ':');
696 if (host_port == NULL) {
700 if (is_prefixed_with(host_port, "http://"))
702 if (*host_port == '\0') {
705 url_to = strchr(host_port, '/');
706 if (url_to == NULL) {
710 proxy_entry = xzalloc(sizeof(*proxy_entry));
711 proxy_entry->url_from = xstrdup(url_from);
712 proxy_entry->host_port = xstrdup(host_port);
714 proxy_entry->url_to = xstrdup(url_to);
715 proxy_entry->next = proxy;
720 /* the rest of directives are non-alphabetic,
721 * must avoid using "toupper'ed" ch */
724 if (ch == '.' /* ".ext:mime/type" */
725 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
726 || (ch == '*' && buf[1] == '.') /* "*.php:/path/php" */
732 cur = xzalloc(sizeof(*cur) /* includes space for NUL */ + strlen_buf);
733 strcpy(cur->before_colon, buf);
734 p = cur->before_colon + (after_colon - buf);
736 cur->after_colon = p;
738 /* .mime line: prepend to mime_a list */
742 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
744 /* script interpreter line: prepend to script_i list */
745 cur->next = script_i;
752 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
753 if (ch == '/') { /* "/file:user:pass" */
758 /* note: path is "" unless we are in SUBDIR parse,
759 * otherwise it does NOT start with "/" */
760 cur = xzalloc(sizeof(*cur) /* includes space for NUL */
764 /* form "/path/file" */
765 sprintf(cur->before_colon, "/%s%.*s",
767 (int) (after_colon - buf - 1), /* includes "/", but not ":" */
769 /* canonicalize it */
770 p = bb_simplify_abs_path_inplace(cur->before_colon);
771 file_len = p - cur->before_colon;
772 /* add "user:pass" after NUL */
773 strcpy(++p, after_colon);
774 cur->after_colon = p;
776 /* insert cur into g_auth */
777 /* g_auth is sorted by decreased filename length */
779 Htaccess *auth, **authp;
782 while ((auth = *authp) != NULL) {
783 if (file_len >= strlen(auth->before_colon)) {
784 /* insert cur before auth */
794 #endif /* BASIC_AUTH */
796 /* the line is not recognized */
798 bb_error_msg("config error '%s' in '%s'", buf, filename);
799 } /* while (fgets) */
804 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
806 * Given a string, html-encode special characters.
807 * This is used for the -e command line option to provide an easy way
808 * for scripts to encode result data without confusing browsers. The
809 * returned string pointer is memory allocated by malloc().
811 * Returns a pointer to the encoded string (malloced).
813 static char *encodeString(const char *string)
815 /* take the simple route and encode everything */
816 /* could possibly scan once to get length. */
817 int len = strlen(string);
818 char *out = xmalloc(len * 6 + 1);
822 while ((ch = *string++) != '\0') {
823 /* very simple check for what to encode */
827 p += sprintf(p, "&#%d;", (unsigned char) ch);
834 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
836 * Decode a base64 data stream as per rfc1521.
837 * Note that the rfc states that non base64 chars are to be ignored.
838 * Since the decode always results in a shorter size than the input,
839 * it is OK to pass the input arg as an output arg.
840 * Parameter: a pointer to a base64 encoded string.
841 * Decoded data is stored in-place.
843 static void decodeBase64(char *Data)
845 const unsigned char *in = (const unsigned char *)Data;
846 /* The decoded size will be at most 3/4 the size of the encoded */
853 if (t >= '0' && t <= '9')
855 else if (t >= 'A' && t <= 'Z')
857 else if (t >= 'a' && t <= 'z')
871 *Data++ = (char) (ch >> 16);
872 *Data++ = (char) (ch >> 8);
882 * Create a listen server socket on the designated port.
884 static int openServer(void)
886 unsigned n = bb_strtou(bind_addr_or_port, NULL, 10);
887 if (!errno && n && n <= 0xffff)
888 n = create_and_bind_stream_or_die(NULL, n);
890 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
896 * Log the connection closure and exit.
898 static void log_and_exit(void) NORETURN;
899 static void log_and_exit(void)
901 /* Paranoia. IE said to be buggy. It may send some extra data
902 * or be confused by us just exiting without SHUT_WR. Oh well. */
903 shutdown(1, SHUT_WR);
905 (this also messes up stdin when user runs httpd -i from terminal)
907 while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0)
912 bb_error_msg("closed");
913 _exit(xfunc_error_retval);
917 * Create and send HTTP response headers.
918 * The arguments are combined and sent as one write operation. Note that
919 * IE will puke big-time if the headers are not sent in one packet and the
920 * second packet is delayed for any reason.
921 * responseNum - the result code to send.
923 static void send_headers(int responseNum)
925 static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
927 const char *responseString = "";
928 const char *infoString = NULL;
929 const char *mime_type;
930 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
931 const char *error_page = NULL;
934 time_t timer = time(NULL);
938 for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
939 if (http_response_type[i] == responseNum) {
940 responseString = http_response[i].name;
941 infoString = http_response[i].info;
942 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
943 error_page = http_error_page[i];
948 /* error message is HTML */
949 mime_type = responseNum == HTTP_OK ?
950 found_mime_type : "text/html";
953 bb_error_msg("response:%u", responseNum);
955 /* emit the current date */
956 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
958 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
959 "Date: %s\r\nConnection: close\r\n",
960 responseNum, responseString, mime_type, tmp_str);
962 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
963 if (responseNum == HTTP_UNAUTHORIZED) {
964 len += sprintf(iobuf + len,
965 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
969 if (responseNum == HTTP_MOVED_TEMPORARILY) {
970 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
971 found_moved_temporarily,
972 (g_query ? "?" : ""),
973 (g_query ? g_query : ""));
976 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
977 if (error_page && access(error_page, R_OK) == 0) {
978 strcat(iobuf, "\r\n");
982 fprintf(stderr, "headers: '%s'\n", iobuf);
983 full_write(STDOUT_FILENO, iobuf, len);
985 fprintf(stderr, "writing error page: '%s'\n", error_page);
986 return send_file_and_exit(error_page, SEND_BODY);
990 if (file_size != -1) { /* file */
991 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
992 #if ENABLE_FEATURE_HTTPD_RANGES
993 if (responseNum == HTTP_PARTIAL_CONTENT) {
994 len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"u-%"OFF_FMT"u/%"OFF_FMT"u\r\n",
998 file_size = range_end - range_start + 1;
1001 len += sprintf(iobuf + len,
1002 #if ENABLE_FEATURE_HTTPD_RANGES
1003 "Accept-Ranges: bytes\r\n"
1005 "Last-Modified: %s\r\n%s %"OFF_FMT"u\r\n",
1007 content_gzip ? "Transfer-length:" : "Content-length:",
1013 len += sprintf(iobuf + len, "Content-Encoding: gzip\r\n");
1015 iobuf[len++] = '\r';
1016 iobuf[len++] = '\n';
1018 len += sprintf(iobuf + len,
1019 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
1020 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
1021 responseNum, responseString,
1022 responseNum, responseString, infoString);
1025 fprintf(stderr, "headers: '%s'\n", iobuf);
1026 if (full_write(STDOUT_FILENO, iobuf, len) != len) {
1028 bb_perror_msg("error");
1033 static void send_headers_and_exit(int responseNum) NORETURN;
1034 static void send_headers_and_exit(int responseNum)
1036 IF_FEATURE_HTTPD_GZIP(content_gzip = 0;)
1037 send_headers(responseNum);
1042 * Read from the socket until '\n' or EOF. '\r' chars are removed.
1043 * '\n' is replaced with NUL.
1044 * Return number of characters read or 0 if nothing is read
1045 * ('\r' and '\n' are not counted).
1046 * Data is returned in iobuf.
1048 static int get_line(void)
1053 alarm(HEADER_READ_TIMEOUT);
1056 hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1061 iobuf[count] = c = *hdr_ptr++;
1067 iobuf[count] = '\0';
1070 if (count < (IOBUF_SIZE - 1)) /* check overflow */
1076 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1078 /* gcc 4.2.1 fares better with NOINLINE */
1079 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN;
1080 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1082 enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1083 struct pollfd pfd[3];
1084 int out_cnt; /* we buffer a bit of initial CGI output */
1087 /* iobuf is used for CGI -> network data,
1088 * hdr_buf is for network -> CGI data (POSTDATA) */
1090 /* If CGI dies, we still want to correctly finish reading its output
1091 * and send it to the peer. So please no SIGPIPEs! */
1092 signal(SIGPIPE, SIG_IGN);
1094 // We inconsistently handle a case when more POSTDATA from network
1095 // is coming than we expected. We may give *some part* of that
1096 // extra data to CGI.
1098 //if (hdr_cnt > post_len) {
1099 // /* We got more POSTDATA from network than we expected */
1100 // hdr_cnt = post_len;
1102 post_len -= hdr_cnt;
1103 /* post_len - number of POST bytes not yet read from network */
1105 /* NB: breaking out of this loop jumps to log_and_exit() */
1107 pfd[FROM_CGI].fd = fromCgi_rd;
1108 pfd[FROM_CGI].events = POLLIN;
1109 pfd[TO_CGI].fd = toCgi_wr;
1111 /* Note: even pfd[0].events == 0 won't prevent
1112 * revents == POLLHUP|POLLERR reports from closed stdin.
1113 * Setting fd to -1 works: */
1115 pfd[0].events = POLLIN;
1116 pfd[0].revents = 0; /* probably not needed, paranoia */
1118 /* We always poll this fd, thus kernel always sets revents: */
1119 /*pfd[FROM_CGI].events = POLLIN; - moved out of loop */
1120 /*pfd[FROM_CGI].revents = 0; - not needed */
1122 /* gcc-4.8.0 still doesnt fill two shorts with one insn :( */
1123 /* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47059 */
1124 /* hopefully one day it will... */
1125 pfd[TO_CGI].events = POLLOUT;
1126 pfd[TO_CGI].revents = 0; /* needed! */
1128 if (toCgi_wr && hdr_cnt <= 0) {
1130 /* Expect more POST data from network */
1133 /* post_len <= 0 && hdr_cnt <= 0:
1134 * no more POST data to CGI,
1135 * let CGI see EOF on CGI's stdin */
1136 if (toCgi_wr != fromCgi_rd)
1142 /* Now wait on the set of sockets */
1143 count = safe_poll(pfd, hdr_cnt > 0 ? TO_CGI+1 : FROM_CGI+1, -1);
1146 if (safe_waitpid(pid, &status, WNOHANG) <= 0) {
1147 /* Weird. CGI didn't exit and no fd's
1148 * are ready, yet poll returned?! */
1151 if (DEBUG && WIFEXITED(status))
1152 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1153 if (DEBUG && WIFSIGNALED(status))
1154 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1159 if (pfd[TO_CGI].revents) {
1160 /* hdr_cnt > 0 here due to the way poll() called */
1161 /* Have data from peer and can write to CGI */
1162 count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1163 /* Doesn't happen, we dont use nonblocking IO here
1164 *if (count < 0 && errno == EAGAIN) {
1171 /* EOF/broken pipe to CGI, stop piping POST data */
1172 hdr_cnt = post_len = 0;
1176 if (pfd[0].revents) {
1177 /* post_len > 0 && hdr_cnt == 0 here */
1178 /* We expect data, prev data portion is eaten by CGI
1179 * and there *is* data to read from the peer
1181 //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
1182 //count = safe_read(STDIN_FILENO, hdr_buf, count);
1183 count = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1189 /* no more POST data can be read */
1194 if (pfd[FROM_CGI].revents) {
1195 /* There is something to read from CGI */
1198 /* Are we still buffering CGI output? */
1200 /* HTTP_200[] has single "\r\n" at the end.
1201 * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1202 * CGI scripts MUST send their own header terminated by
1203 * empty line, then data. That's why we have only one
1204 * <cr><lf> pair here. We will output "200 OK" line
1205 * if needed, but CGI still has to provide blank line
1206 * between header and body */
1208 /* Must use safe_read, not full_read, because
1209 * CGI may output a few first bytes and then wait
1210 * for POSTDATA without closing stdout.
1211 * With full_read we may wait here forever. */
1212 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1214 /* eof (or error) and there was no "HTTP",
1215 * so write it, then write received data */
1217 full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1);
1218 full_write(STDOUT_FILENO, rbuf, out_cnt);
1220 break; /* CGI stdout is closed, exiting */
1224 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1225 if (out_cnt >= 7 && memcmp(rbuf, "Status:", 7) == 0) {
1226 /* send "HTTP/1.0 " */
1227 if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9)
1229 rbuf += 7; /* skip "Status:" */
1230 count = out_cnt - 7;
1231 out_cnt = -1; /* buffering off */
1232 } else if (out_cnt >= 4) {
1233 /* Did CGI add "HTTP"? */
1234 if (memcmp(rbuf, HTTP_200, 4) != 0) {
1235 /* there is no "HTTP", do it ourself */
1236 if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1240 if (!strstr(rbuf, "ontent-")) {
1241 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1243 * Counter-example of valid CGI without Content-type:
1244 * echo -en "HTTP/1.0 302 Found\r\n"
1245 * echo -en "Location: http://www.busybox.net\r\n"
1249 out_cnt = -1; /* buffering off */
1252 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1254 break; /* eof (or error) */
1256 if (full_write(STDOUT_FILENO, rbuf, count) != count)
1259 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1260 } /* if (pfd[FROM_CGI].revents) */
1266 #if ENABLE_FEATURE_HTTPD_CGI
1268 static void setenv1(const char *name, const char *value)
1270 setenv(name, value ? value : "", 1);
1274 * Spawn CGI script, forward CGI's stdin/out <=> network
1276 * Environment variables are set up and the script is invoked with pipes
1277 * for stdin/stdout. If a POST is being done the script is fed the POST
1278 * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1281 * const char *url The requested URL (with leading /).
1282 * const char *orig_uri The original URI before rewriting (if any)
1283 * int post_len Length of the POST body.
1284 * const char *cookie For set HTTP_COOKIE.
1285 * const char *content_type For set CONTENT_TYPE.
1287 static void send_cgi_and_exit(
1289 const char *orig_uri,
1290 const char *request,
1293 const char *content_type) NORETURN;
1294 static void send_cgi_and_exit(
1296 const char *orig_uri,
1297 const char *request,
1300 const char *content_type)
1302 struct fd_pair fromCgi; /* CGI -> httpd pipe */
1303 struct fd_pair toCgi; /* httpd -> CGI pipe */
1304 char *script, *last_slash;
1307 /* Make a copy. NB: caller guarantees:
1308 * url[0] == '/', url[1] != '/' */
1312 * We are mucking with environment _first_ and then vfork/exec,
1313 * this allows us to use vfork safely. Parent doesn't care about
1314 * these environment changes anyway.
1317 /* Check for [dirs/]script.cgi/PATH_INFO */
1318 last_slash = script = (char*)url;
1319 while ((script = strchr(script + 1, '/')) != NULL) {
1322 dir = is_directory(url + 1, /*followlinks:*/ 1);
1325 /* not directory, found script.cgi/PATH_INFO */
1328 /* is directory, find next '/' */
1329 last_slash = script;
1331 setenv1("PATH_INFO", script); /* set to /PATH_INFO or "" */
1332 setenv1("REQUEST_METHOD", request);
1334 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", orig_uri, g_query));
1336 setenv1("REQUEST_URI", orig_uri);
1339 *script = '\0'; /* cut off /PATH_INFO */
1341 /* SCRIPT_FILENAME is required by PHP in CGI mode */
1342 if (home_httpd[0] == '/') {
1343 char *fullpath = concat_path_file(home_httpd, url);
1344 setenv1("SCRIPT_FILENAME", fullpath);
1346 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1347 setenv1("SCRIPT_NAME", url);
1348 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1349 * QUERY_STRING: The information which follows the ? in the URL
1350 * which referenced this script. This is the query information.
1351 * It should not be decoded in any fashion. This variable
1352 * should always be set when there is query information,
1353 * regardless of command line decoding. */
1354 /* (Older versions of bbox seem to do some decoding) */
1355 setenv1("QUERY_STRING", g_query);
1356 putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1357 putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1358 putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1359 /* Having _separate_ variables for IP and port defeats
1360 * the purpose of having socket abstraction. Which "port"
1361 * are you using on Unix domain socket?
1362 * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1365 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1366 char *cp = strrchr(p, ':');
1367 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1369 if (cp) *cp = '\0'; /* delete :PORT */
1370 setenv1("REMOTE_ADDR", p);
1373 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1374 setenv1("REMOTE_PORT", cp + 1);
1378 setenv1("HTTP_USER_AGENT", user_agent);
1380 setenv1("HTTP_ACCEPT", http_accept);
1381 if (http_accept_language)
1382 setenv1("HTTP_ACCEPT_LANGUAGE", http_accept_language);
1384 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1386 setenv1("HTTP_COOKIE", cookie);
1388 setenv1("CONTENT_TYPE", content_type);
1389 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1391 setenv1("REMOTE_USER", remoteuser);
1392 putenv((char*)"AUTH_TYPE=Basic");
1396 setenv1("HTTP_REFERER", referer);
1397 setenv1("HTTP_HOST", host); /* set to "" if NULL */
1398 /* setenv1("SERVER_NAME", safe_gethostname()); - don't do this,
1399 * just run "env SERVER_NAME=xyz httpd ..." instead */
1401 xpiped_pair(fromCgi);
1406 /* TODO: log perror? */
1414 xfunc_error_retval = 242;
1416 /* NB: close _first_, then move fds! */
1419 xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */
1420 xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */
1421 /* User seeing stderr output can be a security problem.
1422 * If CGI really wants that, it can always do dup itself. */
1425 /* Chdiring to script's dir */
1426 script = last_slash;
1427 if (script != url) { /* paranoia */
1429 if (chdir(url + 1) != 0) {
1430 bb_perror_msg("can't change directory to '%s'", url + 1);
1431 goto error_execing_cgi;
1433 // not needed: *script = '/';
1437 /* set argv[0] to name without path */
1441 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1443 char *suffix = strrchr(script, '.');
1447 for (cur = script_i; cur; cur = cur->next) {
1448 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1449 /* found interpreter name */
1450 argv[0] = cur->after_colon;
1459 /* restore default signal dispositions for CGI process */
1466 /* _NOT_ execvp. We do not search PATH. argv[0] is a filename
1467 * without any dir components and will only match a file
1468 * in the current directory */
1469 execv(argv[0], argv);
1471 bb_perror_msg("can't execute '%s'", argv[0]);
1474 * (we are CGI here, our stdout is pumped to the net) */
1475 send_headers_and_exit(HTTP_NOT_FOUND);
1478 /* Parent process */
1480 /* Restore variables possibly changed by child */
1481 xfunc_error_retval = 0;
1486 cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1489 #endif /* FEATURE_HTTPD_CGI */
1492 * Send a file response to a HTTP request, and exit
1495 * const char *url The requested URL (with leading /).
1496 * what What to send (headers/body/both).
1498 static NOINLINE void send_file_and_exit(const char *url, int what)
1505 /* does <url>.gz exist? Then use it instead */
1506 char *gzurl = xasprintf("%s.gz", url);
1507 fd = open(gzurl, O_RDONLY);
1512 file_size = sb.st_size;
1513 last_mod = sb.st_mtime;
1515 IF_FEATURE_HTTPD_GZIP(content_gzip = 0;)
1516 fd = open(url, O_RDONLY);
1519 fd = open(url, O_RDONLY);
1523 bb_perror_msg("can't open '%s'", url);
1524 /* Error pages are sent by using send_file_and_exit(SEND_BODY).
1525 * IOW: it is unsafe to call send_headers_and_exit
1526 * if what is SEND_BODY! Can recurse! */
1527 if (what != SEND_BODY)
1528 send_headers_and_exit(HTTP_NOT_FOUND);
1531 /* If you want to know about EPIPE below
1532 * (happens if you abort downloads from local httpd): */
1533 signal(SIGPIPE, SIG_IGN);
1535 /* If not found, default is "application/octet-stream" */
1536 found_mime_type = "application/octet-stream";
1537 suffix = strrchr(url, '.');
1539 static const char suffixTable[] ALIGN1 =
1540 /* Shorter suffix must be first:
1541 * ".html.htm" will fail for ".htm"
1543 ".txt.h.c.cc.cpp\0" "text/plain\0"
1544 /* .htm line must be after .h line */
1545 ".htm.html\0" "text/html\0"
1546 ".jpg.jpeg\0" "image/jpeg\0"
1547 ".gif\0" "image/gif\0"
1548 ".png\0" "image/png\0"
1549 /* .css line must be after .c line */
1550 ".css\0" "text/css\0"
1551 ".wav\0" "audio/wav\0"
1552 ".avi\0" "video/x-msvideo\0"
1553 ".qt.mov\0" "video/quicktime\0"
1554 ".mpe.mpeg\0" "video/mpeg\0"
1555 ".mid.midi\0" "audio/midi\0"
1556 ".mp3\0" "audio/mpeg\0"
1557 #if 0 /* unpopular */
1558 ".au\0" "audio/basic\0"
1559 ".pac\0" "application/x-ns-proxy-autoconfig\0"
1560 ".vrml.wrl\0" "model/vrml\0"
1562 /* compiler adds another "\0" here */
1566 /* Examine built-in table */
1567 const char *table = suffixTable;
1568 const char *table_next;
1569 for (; *table; table = table_next) {
1570 const char *try_suffix;
1571 const char *mime_type;
1572 mime_type = table + strlen(table) + 1;
1573 table_next = mime_type + strlen(mime_type) + 1;
1574 try_suffix = strstr(table, suffix);
1577 try_suffix += strlen(suffix);
1578 if (*try_suffix == '\0' || *try_suffix == '.') {
1579 found_mime_type = mime_type;
1582 /* Example: strstr(table, ".av") != NULL, but it
1583 * does not match ".avi" after all and we end up here.
1584 * The table is arranged so that in this case we know
1585 * that it can't match anything in the following lines,
1586 * and we stop the search: */
1589 /* ...then user's table */
1590 for (cur = mime_a; cur; cur = cur->next) {
1591 if (strcmp(cur->before_colon, suffix) == 0) {
1592 found_mime_type = cur->after_colon;
1599 bb_error_msg("sending file '%s' content-type: %s",
1600 url, found_mime_type);
1602 #if ENABLE_FEATURE_HTTPD_RANGES
1603 if (what == SEND_BODY /* err pages and ranges don't mix */
1604 || content_gzip /* we are sending compressed page: can't do ranges */ ///why?
1608 range_len = MAXINT(off_t);
1609 if (range_start >= 0) {
1610 if (!range_end || range_end > file_size - 1) {
1611 range_end = file_size - 1;
1613 if (range_end < range_start
1614 || lseek(fd, range_start, SEEK_SET) != range_start
1616 lseek(fd, 0, SEEK_SET);
1619 range_len = range_end - range_start + 1;
1620 send_headers(HTTP_PARTIAL_CONTENT);
1625 if (what & SEND_HEADERS)
1626 send_headers(HTTP_OK);
1627 #if ENABLE_FEATURE_USE_SENDFILE
1629 off_t offset = range_start;
1631 /* sz is rounded down to 64k */
1632 ssize_t sz = MAXINT(ssize_t) - 0xffff;
1633 IF_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1634 count = sendfile(STDOUT_FILENO, fd, &offset, sz);
1636 if (offset == range_start)
1637 break; /* fall back to read/write loop */
1640 IF_FEATURE_HTTPD_RANGES(range_len -= count;)
1641 if (count == 0 || range_len == 0)
1646 while ((count = safe_read(fd, iobuf, IOBUF_SIZE)) > 0) {
1648 IF_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1649 n = full_write(STDOUT_FILENO, iobuf, count);
1652 IF_FEATURE_HTTPD_RANGES(range_len -= count;)
1657 IF_FEATURE_USE_SENDFILE(fin:)
1659 bb_perror_msg("error");
1664 static int checkPermIP(void)
1668 for (cur = ip_a_d; cur; cur = cur->next) {
1671 "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1673 (unsigned char)(cur->ip >> 24),
1674 (unsigned char)(cur->ip >> 16),
1675 (unsigned char)(cur->ip >> 8),
1676 (unsigned char)(cur->ip),
1677 (unsigned char)(cur->mask >> 24),
1678 (unsigned char)(cur->mask >> 16),
1679 (unsigned char)(cur->mask >> 8),
1680 (unsigned char)(cur->mask)
1683 if ((rmt_ip & cur->mask) == cur->ip)
1684 return (cur->allow_deny == 'A'); /* A -> 1 */
1687 return !flg_deny_all; /* depends on whether we saw "D:*" */
1690 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1693 struct pam_userinfo {
1698 static int pam_talker(int num_msg,
1699 const struct pam_message **msg,
1700 struct pam_response **resp,
1704 struct pam_userinfo *userinfo = (struct pam_userinfo *) appdata_ptr;
1705 struct pam_response *response;
1707 if (!resp || !msg || !userinfo)
1708 return PAM_CONV_ERR;
1710 /* allocate memory to store response */
1711 response = xzalloc(num_msg * sizeof(*response));
1714 for (i = 0; i < num_msg; i++) {
1717 switch (msg[i]->msg_style) {
1718 case PAM_PROMPT_ECHO_ON:
1721 case PAM_PROMPT_ECHO_OFF:
1730 return PAM_CONV_ERR;
1732 response[i].resp = xstrdup(s);
1733 if (PAM_SUCCESS != 0)
1734 response[i].resp_retcode = PAM_SUCCESS;
1742 * Config file entries are of the form "/<path>:<user>:<passwd>".
1743 * If config file has no prefix match for path, access is allowed.
1745 * path The file path
1746 * user_and_passwd "user:passwd" to validate
1748 * Returns 1 if user_and_passwd is OK.
1750 static int check_user_passwd(const char *path, char *user_and_passwd)
1753 const char *prev = NULL;
1755 for (cur = g_auth; cur; cur = cur->next) {
1756 const char *dir_prefix;
1760 dir_prefix = cur->before_colon;
1763 /* If already saw a match, don't accept other different matches */
1764 if (prev && strcmp(prev, dir_prefix) != 0)
1768 fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd);
1770 /* If it's not a prefix match, continue searching */
1771 len = strlen(dir_prefix);
1772 if (len != 1 /* dir_prefix "/" matches all, don't need to check */
1773 && (strncmp(dir_prefix, path, len) != 0
1774 || (path[len] != '/' && path[len] != '\0')
1780 /* Path match found */
1783 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1784 char *colon_after_user;
1786 # if ENABLE_FEATURE_SHADOWPASSWDS && !ENABLE_PAM
1790 colon_after_user = strchr(user_and_passwd, ':');
1791 if (!colon_after_user)
1794 /* compare "user:" */
1795 if (cur->after_colon[0] != '*'
1796 && strncmp(cur->after_colon, user_and_passwd,
1797 colon_after_user - user_and_passwd + 1) != 0
1801 /* this cfg entry is '*' or matches username from peer */
1803 passwd = strchr(cur->after_colon, ':');
1807 if (passwd[0] == '*') {
1809 struct pam_userinfo userinfo;
1810 struct pam_conv conv_info = { &pam_talker, (void *) &userinfo };
1813 *colon_after_user = '\0';
1814 userinfo.name = user_and_passwd;
1815 userinfo.pw = colon_after_user + 1;
1816 r = pam_start("httpd", user_and_passwd, &conv_info, &pamh) != PAM_SUCCESS;
1818 r = pam_authenticate(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS
1819 || pam_acct_mgmt(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS
1821 pam_end(pamh, PAM_SUCCESS);
1823 *colon_after_user = ':';
1824 goto end_check_passwd;
1826 # if ENABLE_FEATURE_SHADOWPASSWDS
1827 /* Using _r function to avoid pulling in static buffers */
1832 *colon_after_user = '\0';
1833 pw = getpwnam(user_and_passwd);
1834 *colon_after_user = ':';
1835 if (!pw || !pw->pw_passwd)
1837 passwd = pw->pw_passwd;
1838 # if ENABLE_FEATURE_SHADOWPASSWDS
1839 if ((passwd[0] == 'x' || passwd[0] == '*') && !passwd[1]) {
1840 /* getspnam_r may return 0 yet set result to NULL.
1841 * At least glibc 2.4 does this. Be extra paranoid here. */
1842 struct spwd *result = NULL;
1843 r = getspnam_r(pw->pw_name, &spw, sp_buf, sizeof(sp_buf), &result);
1844 if (r == 0 && result)
1845 passwd = result->sp_pwdp;
1848 /* In this case, passwd is ALWAYS encrypted:
1849 * it came from /etc/passwd or /etc/shadow!
1851 goto check_encrypted;
1852 # endif /* ENABLE_PAM */
1854 /* Else: passwd is from httpd.conf, it is either plaintext or encrypted */
1856 if (passwd[0] == '$' && isdigit(passwd[1])) {
1861 /* encrypt pwd from peer and check match with local one */
1862 encrypted = pw_encrypt(
1863 /* pwd (from peer): */ colon_after_user + 1,
1867 r = strcmp(encrypted, passwd);
1870 /* local passwd is from httpd.conf and it's plaintext */
1871 r = strcmp(colon_after_user + 1, passwd);
1873 goto end_check_passwd;
1876 /* Comparing plaintext "user:pass" in one go */
1877 r = strcmp(cur->after_colon, user_and_passwd);
1880 remoteuser = xstrndup(user_and_passwd,
1881 strchrnul(user_and_passwd, ':') - user_and_passwd
1887 /* 0(bad) if prev is set: matches were found but passwd was wrong */
1888 return (prev == NULL);
1890 #endif /* FEATURE_HTTPD_BASIC_AUTH */
1892 #if ENABLE_FEATURE_HTTPD_PROXY
1893 static Htaccess_Proxy *find_proxy_entry(const char *url)
1896 for (p = proxy; p; p = p->next) {
1897 if (is_prefixed_with(url, p->url_from))
1907 static void send_REQUEST_TIMEOUT_and_exit(int sig) NORETURN;
1908 static void send_REQUEST_TIMEOUT_and_exit(int sig UNUSED_PARAM)
1910 send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1914 * Handle an incoming http request and exit.
1916 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN;
1917 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1919 static const char request_GET[] ALIGN1 = "GET";
1924 #if ENABLE_FEATURE_HTTPD_CGI
1925 static const char request_HEAD[] ALIGN1 = "HEAD";
1926 const char *prequest;
1927 char *cookie = NULL;
1928 char *content_type = NULL;
1929 unsigned long length = 0;
1930 #elif ENABLE_FEATURE_HTTPD_PROXY
1931 #define prequest request_GET
1932 unsigned long length = 0;
1934 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1935 smallint authorized = -1;
1937 smallint ip_allowed;
1938 char http_major_version;
1939 #if ENABLE_FEATURE_HTTPD_PROXY
1940 char http_minor_version;
1941 char *header_buf = header_buf; /* for gcc */
1942 char *header_ptr = header_ptr;
1943 Htaccess_Proxy *proxy_entry;
1946 /* Allocation of iobuf is postponed until now
1947 * (IOW, server process doesn't need to waste 8k) */
1948 iobuf = xmalloc(IOBUF_SIZE);
1951 if (fromAddr->u.sa.sa_family == AF_INET) {
1952 rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr);
1954 #if ENABLE_FEATURE_IPV6
1955 if (fromAddr->u.sa.sa_family == AF_INET6
1956 && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0
1957 && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0
1958 && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1959 rmt_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]);
1961 if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1962 /* NB: can be NULL (user runs httpd -i by hand?) */
1963 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa);
1966 /* this trick makes -v logging much simpler */
1968 applet_name = rmt_ip_str;
1970 bb_error_msg("connected");
1973 /* Install timeout handler. get_line() needs it. */
1974 signal(SIGALRM, send_REQUEST_TIMEOUT_and_exit);
1976 if (!get_line()) /* EOF or error or empty line */
1977 send_headers_and_exit(HTTP_BAD_REQUEST);
1979 /* Determine type of request (GET/POST) */
1980 // rfc2616: method and URI is separated by exactly one space
1981 //urlp = strpbrk(iobuf, " \t"); - no, tab isn't allowed
1982 urlp = strchr(iobuf, ' ');
1984 send_headers_and_exit(HTTP_BAD_REQUEST);
1986 #if ENABLE_FEATURE_HTTPD_CGI
1987 prequest = request_GET;
1988 if (strcasecmp(iobuf, prequest) != 0) {
1989 prequest = request_HEAD;
1990 if (strcasecmp(iobuf, prequest) != 0) {
1992 if (strcasecmp(iobuf, prequest) != 0)
1993 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1997 if (strcasecmp(iobuf, request_GET) != 0)
1998 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2000 // rfc2616: method and URI is separated by exactly one space
2001 //urlp = skip_whitespace(urlp); - should not be necessary
2003 send_headers_and_exit(HTTP_BAD_REQUEST);
2005 /* Find end of URL and parse HTTP version, if any */
2006 http_major_version = '0';
2007 IF_FEATURE_HTTPD_PROXY(http_minor_version = '0';)
2008 tptr = strchrnul(urlp, ' ');
2009 /* Is it " HTTP/"? */
2010 if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) {
2011 http_major_version = tptr[6];
2012 IF_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];)
2016 /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
2017 urlcopy = alloca((tptr - urlp) + 2 + strlen(index_page));
2018 /*if (urlcopy == NULL)
2019 * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
2020 strcpy(urlcopy, urlp);
2021 /* NB: urlcopy ptr is never changed after this */
2023 /* Extract url args if present */
2024 /* g_query = NULL; - already is */
2025 tptr = strchr(urlcopy, '?');
2031 /* Decode URL escape sequences */
2032 tptr = percent_decode_in_place(urlcopy, /*strict:*/ 1);
2034 send_headers_and_exit(HTTP_BAD_REQUEST);
2035 if (tptr == urlcopy + 1) {
2036 /* '/' or NUL is encoded */
2037 send_headers_and_exit(HTTP_NOT_FOUND);
2040 /* Canonicalize path */
2041 /* Algorithm stolen from libbb bb_simplify_path(),
2042 * but don't strdup, retain trailing slash, protect root */
2043 urlp = tptr = urlcopy;
2046 /* skip duplicate (or initial) slash */
2051 if (tptr[1] == '.' && (tptr[2] == '/' || tptr[2] == '\0')) {
2052 /* "..": be careful */
2054 if (urlp == urlcopy)
2055 send_headers_and_exit(HTTP_BAD_REQUEST);
2056 /* omit previous dir */
2057 while (*--urlp != '/')
2059 /* skip to "./" or ".<NUL>" */
2062 if (tptr[1] == '/' || tptr[1] == '\0') {
2063 /* skip extra "/./" */
2075 /* If URL is a directory, add '/' */
2076 if (urlp[-1] != '/') {
2077 if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) {
2078 found_moved_temporarily = urlcopy;
2084 bb_error_msg("url:%s", urlcopy);
2087 ip_allowed = checkPermIP();
2088 while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
2089 /* have path1/path2 */
2091 if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) {
2092 /* may have subdir config */
2093 parse_conf(urlcopy + 1, SUBDIR_PARSE);
2094 ip_allowed = checkPermIP();
2099 #if ENABLE_FEATURE_HTTPD_PROXY
2100 proxy_entry = find_proxy_entry(urlcopy);
2102 header_buf = header_ptr = xmalloc(IOBUF_SIZE);
2105 if (http_major_version >= '0') {
2106 /* Request was with "... HTTP/nXXX", and n >= 0 */
2108 /* Read until blank line */
2111 break; /* EOF or error or empty line */
2113 bb_error_msg("header: '%s'", iobuf);
2115 #if ENABLE_FEATURE_HTTPD_PROXY
2116 /* We need 2 more bytes for yet another "\r\n" -
2117 * see near fdprintf(proxy_fd...) further below */
2118 if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) {
2119 int len = strlen(iobuf);
2120 if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4)
2121 len = IOBUF_SIZE - (header_ptr - header_buf) - 4;
2122 memcpy(header_ptr, iobuf, len);
2124 header_ptr[0] = '\r';
2125 header_ptr[1] = '\n';
2130 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
2131 /* Try and do our best to parse more lines */
2132 if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
2133 /* extra read only for POST */
2134 if (prequest != request_GET
2135 # if ENABLE_FEATURE_HTTPD_CGI
2136 && prequest != request_HEAD
2139 tptr = skip_whitespace(iobuf + sizeof("Content-length:") - 1);
2141 send_headers_and_exit(HTTP_BAD_REQUEST);
2142 /* not using strtoul: it ignores leading minus! */
2143 length = bb_strtou(tptr, NULL, 10);
2144 /* length is "ulong", but we need to pass it to int later */
2145 if (errno || length > INT_MAX)
2146 send_headers_and_exit(HTTP_BAD_REQUEST);
2150 #if ENABLE_FEATURE_HTTPD_CGI
2151 else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
2152 cookie = xstrdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
2153 } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
2154 content_type = xstrdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
2155 } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
2156 referer = xstrdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
2157 } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
2158 user_agent = xstrdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
2159 } else if (STRNCASECMP(iobuf, "Host:") == 0) {
2160 host = xstrdup(skip_whitespace(iobuf + sizeof("Host:")-1));
2161 } else if (STRNCASECMP(iobuf, "Accept:") == 0) {
2162 http_accept = xstrdup(skip_whitespace(iobuf + sizeof("Accept:")-1));
2163 } else if (STRNCASECMP(iobuf, "Accept-Language:") == 0) {
2164 http_accept_language = xstrdup(skip_whitespace(iobuf + sizeof("Accept-Language:")-1));
2167 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2168 if (STRNCASECMP(iobuf, "Authorization:") == 0) {
2169 /* We only allow Basic credentials.
2170 * It shows up as "Authorization: Basic <user>:<passwd>" where
2171 * "<user>:<passwd>" is base64 encoded.
2173 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
2174 if (STRNCASECMP(tptr, "Basic") != 0)
2176 tptr += sizeof("Basic")-1;
2177 /* decodeBase64() skips whitespace itself */
2179 authorized = check_user_passwd(urlcopy, tptr);
2182 #if ENABLE_FEATURE_HTTPD_RANGES
2183 if (STRNCASECMP(iobuf, "Range:") == 0) {
2184 /* We know only bytes=NNN-[MMM] */
2185 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
2186 if (is_prefixed_with(s, "bytes=") == 0) {
2187 s += sizeof("bytes=")-1;
2188 range_start = BB_STRTOOFF(s, &s, 10);
2189 if (s[0] != '-' || range_start < 0) {
2192 range_end = BB_STRTOOFF(s+1, NULL, 10);
2193 if (errno || range_end < range_start)
2199 #if ENABLE_FEATURE_HTTPD_GZIP
2200 if (STRNCASECMP(iobuf, "Accept-Encoding:") == 0) {
2201 /* Note: we do not support "gzip;q=0"
2202 * method of _disabling_ gzip
2203 * delivery. No one uses that, though */
2204 const char *s = strstr(iobuf, "gzip");
2206 // want more thorough checks?
2216 } /* while extra header reading */
2219 /* We are done reading headers, disable peer timeout */
2222 if (strcmp(bb_basename(urlcopy), HTTPD_CONF) == 0 || !ip_allowed) {
2223 /* protect listing [/path]/httpd.conf or IP deny */
2224 send_headers_and_exit(HTTP_FORBIDDEN);
2227 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2228 /* Case: no "Authorization:" was seen, but page might require passwd.
2229 * Check that with dummy user:pass */
2231 authorized = check_user_passwd(urlcopy, (char *) "");
2233 send_headers_and_exit(HTTP_UNAUTHORIZED);
2236 if (found_moved_temporarily) {
2237 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
2240 #if ENABLE_FEATURE_HTTPD_PROXY
2241 if (proxy_entry != NULL) {
2243 len_and_sockaddr *lsa;
2245 proxy_fd = socket(AF_INET, SOCK_STREAM, 0);
2247 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2248 lsa = host2sockaddr(proxy_entry->host_port, 80);
2250 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2251 if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0)
2252 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2253 fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n",
2254 prequest, /* GET or POST */
2255 proxy_entry->url_to, /* url part 1 */
2256 urlcopy + strlen(proxy_entry->url_from), /* url part 2 */
2257 (g_query ? "?" : ""), /* "?" (maybe) */
2258 (g_query ? g_query : ""), /* query string (maybe) */
2259 http_major_version, http_minor_version);
2260 header_ptr[0] = '\r';
2261 header_ptr[1] = '\n';
2263 write(proxy_fd, header_buf, header_ptr - header_buf);
2264 free(header_buf); /* on the order of 8k, free it */
2265 cgi_io_loop_and_exit(proxy_fd, proxy_fd, length);
2269 tptr = urlcopy + 1; /* skip first '/' */
2271 #if ENABLE_FEATURE_HTTPD_CGI
2272 if (is_prefixed_with(tptr, "cgi-bin/")) {
2273 if (tptr[8] == '\0') {
2274 /* protect listing "cgi-bin/" */
2275 send_headers_and_exit(HTTP_FORBIDDEN);
2277 send_cgi_and_exit(urlcopy, urlcopy, prequest, length, cookie, content_type);
2281 if (urlp[-1] == '/') {
2282 /* When index_page string is appended to <dir>/ URL, it overwrites
2283 * the query string. If we fall back to call /cgi-bin/index.cgi,
2284 * query string would be lost and not available to the CGI.
2285 * Work around it by making a deep copy.
2287 if (ENABLE_FEATURE_HTTPD_CGI)
2288 g_query = xstrdup(g_query); /* ok for NULL too */
2289 strcpy(urlp, index_page);
2291 if (stat(tptr, &sb) == 0) {
2292 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
2293 char *suffix = strrchr(tptr, '.');
2296 for (cur = script_i; cur; cur = cur->next) {
2297 if (strcmp(cur->before_colon + 1, suffix) == 0) {
2298 send_cgi_and_exit(urlcopy, urlcopy, prequest, length, cookie, content_type);
2303 file_size = sb.st_size;
2304 last_mod = sb.st_mtime;
2306 #if ENABLE_FEATURE_HTTPD_CGI
2307 else if (urlp[-1] == '/') {
2308 /* It's a dir URL and there is no index.html
2309 * Try cgi-bin/index.cgi */
2310 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
2311 urlp[0] = '\0'; /* remove index_page */
2312 send_cgi_and_exit("/cgi-bin/index.cgi", urlcopy, prequest, length, cookie, content_type);
2315 /* else fall through to send_file, it errors out if open fails: */
2317 if (prequest != request_GET && prequest != request_HEAD) {
2318 /* POST for files does not make sense */
2319 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2321 send_file_and_exit(tptr,
2322 (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS)
2325 send_file_and_exit(tptr, SEND_HEADERS_AND_BODY);
2330 * The main http server function.
2331 * Given a socket, listen for new connections and farm out
2332 * the processing as a [v]forked process.
2336 static void mini_httpd(int server_socket) NORETURN;
2337 static void mini_httpd(int server_socket)
2339 /* NB: it's best to not use xfuncs in this loop before fork().
2340 * Otherwise server may die on transient errors (temporary
2341 * out-of-memory condition, etc), which is Bad(tm).
2342 * Try to do any dangerous calls after fork.
2346 len_and_sockaddr fromAddr;
2348 /* Wait for connections... */
2349 fromAddr.len = LSA_SIZEOF_SA;
2350 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2354 /* set the KEEPALIVE option to cull dead connections */
2355 setsockopt_keepalive(n);
2359 /* Do not reload config on HUP */
2360 signal(SIGHUP, SIG_IGN);
2361 close(server_socket);
2365 handle_incoming_and_exit(&fromAddr);
2367 /* parent, or fork failed */
2373 static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN;
2374 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2376 char *argv_copy[argc + 2];
2378 argv_copy[0] = argv[0];
2379 argv_copy[1] = (char*)"-i";
2380 memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2382 /* NB: it's best to not use xfuncs in this loop before vfork().
2383 * Otherwise server may die on transient errors (temporary
2384 * out-of-memory condition, etc), which is Bad(tm).
2385 * Try to do any dangerous calls after fork.
2389 len_and_sockaddr fromAddr;
2391 /* Wait for connections... */
2392 fromAddr.len = LSA_SIZEOF_SA;
2393 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2397 /* set the KEEPALIVE option to cull dead connections */
2398 setsockopt_keepalive(n);
2402 /* Do not reload config on HUP */
2403 signal(SIGHUP, SIG_IGN);
2404 close(server_socket);
2408 /* Run a copy of ourself in inetd mode */
2411 argv_copy[0][0] &= 0x7f;
2412 /* parent, or vfork failed */
2420 * Process a HTTP connection on stdin/out.
2423 static void mini_httpd_inetd(void) NORETURN;
2424 static void mini_httpd_inetd(void)
2426 len_and_sockaddr fromAddr;
2428 memset(&fromAddr, 0, sizeof(fromAddr));
2429 fromAddr.len = LSA_SIZEOF_SA;
2430 /* NB: can fail if user runs it by hand and types in http cmds */
2431 getpeername(0, &fromAddr.u.sa, &fromAddr.len);
2432 handle_incoming_and_exit(&fromAddr);
2435 static void sighup_handler(int sig UNUSED_PARAM)
2437 parse_conf(DEFAULT_PATH_HTTPD_CONF, SIGNALED_PARSE);
2441 c_opt_config_file = 0,
2444 IF_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2445 IF_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,)
2446 IF_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,)
2447 IF_FEATURE_HTTPD_SETUID( u_opt_setuid ,)
2452 OPT_CONFIG_FILE = 1 << c_opt_config_file,
2453 OPT_DECODE_URL = 1 << d_opt_decode_url,
2454 OPT_HOME_HTTPD = 1 << h_opt_home_httpd,
2455 OPT_ENCODE_URL = IF_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2456 OPT_REALM = IF_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0,
2457 OPT_MD5 = IF_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0,
2458 OPT_SETUID = IF_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0,
2459 OPT_PORT = 1 << p_opt_port,
2460 OPT_INETD = 1 << p_opt_inetd,
2461 OPT_FOREGROUND = 1 << p_opt_foreground,
2462 OPT_VERBOSE = 1 << p_opt_verbose,
2466 int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2467 int httpd_main(int argc UNUSED_PARAM, char **argv)
2469 int server_socket = server_socket; /* for gcc */
2471 char *url_for_decode;
2472 IF_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2473 IF_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2474 IF_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2475 IF_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2479 #if ENABLE_LOCALE_SUPPORT
2480 /* Undo busybox.c: we want to speak English in http (dates etc) */
2481 setlocale(LC_TIME, "C");
2484 home_httpd = xrealloc_getcwd_or_warn(NULL);
2485 /* -v counts, -i implies -f */
2486 opt_complementary = "vv:if";
2487 /* We do not "absolutize" path given by -h (home) opt.
2488 * If user gives relative path in -h,
2489 * $SCRIPT_FILENAME will not be set. */
2490 opt = getopt32(argv, "c:d:h:"
2491 IF_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2492 IF_FEATURE_HTTPD_BASIC_AUTH("r:")
2493 IF_FEATURE_HTTPD_AUTH_MD5("m:")
2494 IF_FEATURE_HTTPD_SETUID("u:")
2496 &opt_c_configFile, &url_for_decode, &home_httpd
2497 IF_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2498 IF_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2499 IF_FEATURE_HTTPD_AUTH_MD5(, &pass)
2500 IF_FEATURE_HTTPD_SETUID(, &s_ugid)
2501 , &bind_addr_or_port
2504 if (opt & OPT_DECODE_URL) {
2505 fputs(percent_decode_in_place(url_for_decode, /*strict:*/ 0), stdout);
2508 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2509 if (opt & OPT_ENCODE_URL) {
2510 fputs(encodeString(url_for_encode), stdout);
2514 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2515 if (opt & OPT_MD5) {
2516 char salt[sizeof("$1$XXXXXXXX")];
2520 crypt_make_salt(salt + 3, 4);
2521 puts(pw_encrypt(pass, salt, /*cleanup:*/ 0));
2525 #if ENABLE_FEATURE_HTTPD_SETUID
2526 if (opt & OPT_SETUID) {
2527 xget_uidgid(&ugid, s_ugid);
2532 if (!(opt & OPT_FOREGROUND)) {
2533 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2538 if (!(opt & OPT_INETD)) {
2539 signal(SIGCHLD, SIG_IGN);
2540 server_socket = openServer();
2541 #if ENABLE_FEATURE_HTTPD_SETUID
2542 /* drop privileges */
2543 if (opt & OPT_SETUID) {
2544 if (ugid.gid != (gid_t)-1) {
2545 if (setgroups(1, &ugid.gid) == -1)
2546 bb_perror_msg_and_die("setgroups");
2555 /* User can do it himself: 'env - PATH="$PATH" httpd'
2556 * We don't do it because we don't want to screw users
2558 * 'env - VAR1=val1 VAR2=val2 httpd'
2559 * and have VAR1 and VAR2 values visible in their CGIs.
2560 * Besides, it is also smaller. */
2562 char *p = getenv("PATH");
2563 /* env strings themself are not freed, no need to xstrdup(p): */
2567 // if (!(opt & OPT_INETD))
2568 // setenv_long("SERVER_PORT", ???);
2572 parse_conf(DEFAULT_PATH_HTTPD_CONF, FIRST_PARSE);
2573 if (!(opt & OPT_INETD))
2574 signal(SIGHUP, sighup_handler);
2576 xfunc_error_retval = 0;
2577 if (opt & OPT_INETD)
2580 if (!(opt & OPT_FOREGROUND))
2581 bb_daemonize(0); /* don't change current directory */
2582 mini_httpd(server_socket); /* never returns */
2584 mini_httpd_nommu(server_socket, argc, argv); /* never returns */