2 * httpd implementation for busybox
4 * Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org>
5 * Copyright (C) 2003-2006 Vladimir Oleynik <dzo@simtreas.ru>
7 * simplify patch stolen from libbb without using strdup
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *****************************************************************************
27 * httpd -p 8080 -h $HOME/public_html
28 * or for daemon start from rc script with uid=0:
30 * This is equivalent if www user have uid=80 to
31 * httpd -p 80 -u 80 -h /www -c /etc/httpd.conf -r "Web Server Authentication"
34 * When a url contains "cgi-bin" it is assumed to be a cgi script. The
35 * server changes directory to the location of the script and executes it
36 * after setting QUERY_STRING and other environment variables.
38 * The server can also be invoked as a url arg decoder and html text encoder
40 * foo=`httpd -d $foo` # decode "Hello%20World" as "Hello World"
41 * bar=`httpd -e "<Hello World>"` # encode as "<Hello World>"
42 * Note that url encoding for arguments is not the same as html encoding for
43 * presentation. -d decodes a url-encoded argument while -e encodes in html
46 * httpd.conf has the following format:
48 * A:172.20. # Allow address from 172.20.0.0/16
49 * A:10.0.0.0/25 # Allow any address from 10.0.0.0-10.0.0.127
50 * A:10.0.0.0/255.255.255.128 # Allow any address that previous set
51 * A:127.0.0.1 # Allow local loopback connections
52 * D:* # Deny from other IP connections
53 * /cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/
54 * /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/
55 * /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/
56 * .au:audio/basic # additional mime type for audio.au files
57 * *.php:/path/php # running cgi.php scripts through an interpreter
59 * A/D may be as a/d or allow/deny - first char case insensitive
60 * Deny IP rules take precedence over allow rules.
63 * The Deny/Allow IP logic:
65 * - Default is to allow all. No addresses are denied unless
66 * denied with a D: rule.
67 * - Order of Deny/Allow rules is significant
68 * - Deny rules take precedence over allow rules.
69 * - If a deny all rule (D:*) is used it acts as a catch-all for unmatched
71 * - Specification of Allow all (A:*) is a no-op
74 * 1. Allow only specified addresses
75 * A:172.20 # Allow any address that begins with 172.20.
76 * A:10.10. # Allow any address that begins with 10.10.
77 * A:127.0.0.1 # Allow local loopback connections
78 * D:* # Deny from other IP connections
80 * 2. Only deny specified addresses
81 * D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255
82 * D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255
83 * A:* # (optional line added for clarity)
85 * If a sub directory contains a config file it is parsed and merged with
86 * any existing settings as if it was appended to the original configuration.
88 * subdir paths are relative to the containing subdir and thus cannot
89 * affect the parent rules.
91 * Note that since the sub dir is parsed in the forked thread servicing the
92 * subdir http request, any merge is discarded when the process exits. As a
93 * result, the subdir settings only have a lifetime of a single request.
96 * If -c is not set, an attempt will be made to open the default
97 * root configuration file. If -c is set and the file is not found, the
98 * server exits with an error.
104 #include <ctype.h> /* for isspace */
106 #include <stdlib.h> /* for malloc */
108 #include <unistd.h> /* for close */
110 #include <sys/types.h>
111 #include <sys/socket.h> /* for connect and socket*/
112 #include <netinet/in.h> /* for sockaddr_in */
113 #include <sys/time.h>
114 #include <sys/stat.h>
115 #include <sys/wait.h>
116 #include <fcntl.h> /* for open modes */
120 static const char httpdVersion[] = "busybox httpd/1.35 6-Oct-2004";
121 static const char default_path_httpd_conf[] = "/etc";
122 static const char httpd_conf[] = "httpd.conf";
123 static const char home[] = "./";
126 # define cont_l_fmt "%lld"
127 # define cont_l_type (long long)
129 # define cont_l_fmt "%ld"
130 # define cont_l_type (long)
135 // Note: busybox xfuncs are not used because we want the server to keep running
136 // if something bad happens due to a malformed user request.
137 // As a result, all memory allocation after daemonize
138 // is checked rigorously
142 /* Configure options, disabled by default as custom httpd feature */
144 /* disabled as optional features */
145 //#define CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
146 //#define CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
147 //#define CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
148 //#define CONFIG_FEATURE_HTTPD_SETUID
149 //#define CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
151 /* If set, use this server from internet superserver only */
152 //#define CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
154 /* You can use this server as standalone, require libbb.a for linking */
155 //#define HTTPD_STANDALONE
157 /* Config options, disable this for do very small module */
158 //#define CONFIG_FEATURE_HTTPD_CGI
159 //#define CONFIG_FEATURE_HTTPD_BASIC_AUTH
160 //#define CONFIG_FEATURE_HTTPD_AUTH_MD5
162 #ifdef HTTPD_STANDALONE
163 /* standalone, enable all features */
164 #undef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
165 /* unset config option for remove warning as redefined */
166 #undef CONFIG_FEATURE_HTTPD_BASIC_AUTH
167 #undef CONFIG_FEATURE_HTTPD_AUTH_MD5
168 #undef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
169 #undef CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
170 #undef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
171 #undef CONFIG_FEATURE_HTTPD_CGI
172 #undef CONFIG_FEATURE_HTTPD_SETUID
173 #undef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
174 #undef ENABLE_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
175 #undef ENABLE_FEATURE_HTTPD_BASIC_AUTH
176 #undef ENABLE_FEATURE_HTTPD_AUTH_MD5
177 #undef ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
178 #undef ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
179 #undef ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
180 #undef ENABLE_FEATURE_HTTPD_CGI
181 #undef ENABLE_FEATURE_HTTPD_SETUID
182 #undef ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
183 /* enable all features now */
184 #define CONFIG_FEATURE_HTTPD_BASIC_AUTH
185 #define CONFIG_FEATURE_HTTPD_AUTH_MD5
186 #define CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
187 #define CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
188 #define CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
189 #define CONFIG_FEATURE_HTTPD_CGI
190 #define CONFIG_FEATURE_HTTPD_SETUID
191 #define CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
192 #define ENABLE_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY 0
193 #define ENABLE_FEATURE_HTTPD_BASIC_AUTH 1
194 #define ENABLE_FEATURE_HTTPD_AUTH_MD5 1
195 #define ENABLE_FEATURE_HTTPD_ENCODE_URL_STR 1
196 #define ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV 1
197 #define ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES 1
198 #define ENABLE_FEATURE_HTTPD_CGI 1
199 #define ENABLE_FEATURE_HTTPD_SETUID 1
200 #define ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP 1
202 /* require from libbb.a for linking */
203 const char *bb_applet_name = "httpd";
205 void bb_show_usage(void)
207 fprintf(stderr, "Usage: %s [-p <port>] [-c configFile] [-d/-e <string>] "
208 "[-r realm] [-u user] [-h homedir]\n", bb_applet_name);
213 #ifdef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
214 #undef CONFIG_FEATURE_HTTPD_SETUID /* use inetd user.group config settings */
215 #undef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP /* so is not daemon */
216 /* inetd set stderr to accepted socket and we can`t true see debug messages */
224 #define MAX_MEMORY_BUFF 8192 /* IO buffer */
226 typedef struct HT_ACCESS {
228 struct HT_ACCESS *next;
229 char before_colon[1]; /* really bigger, must last */
232 typedef struct HT_ACCESS_IP {
236 struct HT_ACCESS_IP *next;
241 char buf[MAX_MEMORY_BUFF];
243 USE_FEATURE_HTTPD_BASIC_AUTH(const char *realm;)
244 USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
248 USE_FEATURE_HTTPD_CGI(char *referer;)
250 const char *configFile;
253 #if ENABLE_FEATURE_HTTPD_CGI || DEBUG
254 char rmt_ip_str[16]; /* for set env REMOTE_ADDR */
256 unsigned port; /* server initial port and for
257 set env REMOTE_PORT */
259 const char *found_mime_type;
260 const char *found_moved_temporarily;
263 off_t ContentLength; /* -1 - unknown */
266 Htaccess_IP *ip_a_d; /* config allow/deny lines */
268 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
269 Htaccess *auth; /* config user:password lines */
271 #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
272 Htaccess *mime_a; /* config mime types */
275 #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
277 # define a_c_r config->accepted_socket
278 # define a_c_w config->accepted_socket
283 volatile int alarm_signaled;
285 #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
286 Htaccess *script_i; /* config script interpreters */
290 static HttpdConfig *config;
292 static const char request_GET[] = "GET"; /* size algorithic optimize */
294 static const char* const suffixTable [] = {
295 /* Warning: shorted equivalent suffix in one line must be first */
296 ".htm.html", "text/html",
297 ".jpg.jpeg", "image/jpeg",
300 ".txt.h.c.cc.cpp", "text/plain",
303 ".avi", "video/x-msvideo",
304 ".qt.mov", "video/quicktime",
305 ".mpe.mpeg", "video/mpeg",
306 ".mid.midi", "audio/midi",
307 ".mp3", "audio/mpeg",
308 #if 0 /* unpopular */
309 ".au", "audio/basic",
310 ".pac", "application/x-ns-proxy-autoconfig",
311 ".vrml.wrl", "model/vrml",
313 0, "application/octet-stream" /* default */
319 HTTP_MOVED_TEMPORARILY = 302,
320 HTTP_BAD_REQUEST = 400, /* malformed syntax */
321 HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
322 HTTP_NOT_FOUND = 404,
323 HTTP_FORBIDDEN = 403,
324 HTTP_REQUEST_TIMEOUT = 408,
325 HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */
326 HTTP_INTERNAL_SERVER_ERROR = 500,
327 #if 0 /* future use */
329 HTTP_SWITCHING_PROTOCOLS = 101,
332 HTTP_NON_AUTHORITATIVE_INFO = 203,
333 HTTP_NO_CONTENT = 204,
334 HTTP_MULTIPLE_CHOICES = 300,
335 HTTP_MOVED_PERMANENTLY = 301,
336 HTTP_NOT_MODIFIED = 304,
337 HTTP_PAYMENT_REQUIRED = 402,
338 HTTP_BAD_GATEWAY = 502,
339 HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
340 HTTP_RESPONSE_SETSIZE=0xffffffff
346 HttpResponseNum type;
351 static const HttpEnumString httpResponseNames[] = {
352 { HTTP_OK, "OK", NULL },
353 { HTTP_MOVED_TEMPORARILY, "Found", "Directories must end with a slash." },
354 { HTTP_REQUEST_TIMEOUT, "Request Timeout",
355 "No request appeared within a reasonable time period." },
356 { HTTP_NOT_IMPLEMENTED, "Not Implemented",
357 "The requested method is not recognized by this server." },
358 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
359 { HTTP_UNAUTHORIZED, "Unauthorized", "" },
361 { HTTP_NOT_FOUND, "Not Found",
362 "The requested URL was not found on this server." },
363 { HTTP_BAD_REQUEST, "Bad Request", "Unsupported method." },
364 { HTTP_FORBIDDEN, "Forbidden", "" },
365 { HTTP_INTERNAL_SERVER_ERROR, "Internal Server Error",
366 "Internal Server Error" },
367 #if 0 /* not implemented */
368 { HTTP_CREATED, "Created" },
369 { HTTP_ACCEPTED, "Accepted" },
370 { HTTP_NO_CONTENT, "No Content" },
371 { HTTP_MULTIPLE_CHOICES, "Multiple Choices" },
372 { HTTP_MOVED_PERMANENTLY, "Moved Permanently" },
373 { HTTP_NOT_MODIFIED, "Not Modified" },
374 { HTTP_BAD_GATEWAY, "Bad Gateway", "" },
375 { HTTP_SERVICE_UNAVAILABLE, "Service Unavailable", "" },
380 static const char RFC1123FMT[] = "%a, %d %b %Y %H:%M:%S GMT";
381 static const char Content_length[] = "Content-length:";
385 scan_ip (const char **ep, unsigned int *ip, unsigned char endc)
392 for (j = 0; j < 4; j++) {
395 if ((*p < '0' || *p > '9') && (*p != '/' || j == 0) && *p != 0)
398 while (*p >= '0' && *p <= '9') {
407 if (*p != '/' && *p != 0)
409 *ip = ((*ip) << 8) | octet;
423 scan_ip_mask (const char *ipm, unsigned int *ip, unsigned int *mask)
428 i = scan_ip(&ipm, ip, '/');
436 if (*p < '0' || *p > '9') {
438 i = scan_ip (&ipm, mask, 0);
460 #if defined(CONFIG_FEATURE_HTTPD_BASIC_AUTH) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES)
461 static void free_config_lines(Htaccess **pprev)
463 Htaccess *prev = *pprev;
466 Htaccess *cur = prev;
476 #define FIRST_PARSE 0
477 #define SUBDIR_PARSE 1
478 #define SIGNALED_PARSE 2
479 #define FIND_FROM_HTTPD_ROOT 3
480 /****************************************************************************
482 > $Function: parse_conf()
484 * $Description: parse configuration file into in-memory linked list.
486 * The first non-white character is examined to determine if the config line
487 * is one of the following:
488 * .ext:mime/type # new mime type not compiled into httpd
489 * [adAD]:from # ip address allow/deny, * for wildcard
490 * /path:user:pass # username/password
492 * Any previous IP rules are discarded.
493 * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
494 * are also discarded. That is, previous settings are retained if flag is
498 * (const char *) path . . null for ip address checks, path for password
500 * (int) flag . . . . . . the source of the parse request.
504 ****************************************************************************/
505 static void parse_conf(const char *path, int flag)
508 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
509 Htaccess *prev, *cur;
510 #elif CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
514 const char *cf = config->configFile;
519 /* free previous ip setup if present */
520 Htaccess_IP *pip = config->ip_a_d;
523 Htaccess_IP *cur_ipl = pip;
528 config->ip_a_d = NULL;
530 config->flg_deny_all = 0;
532 #if defined(CONFIG_FEATURE_HTTPD_BASIC_AUTH) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR)
533 /* retain previous auth and mime config only for subdir parse */
534 if(flag != SUBDIR_PARSE) {
535 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
536 free_config_lines(&config->auth);
538 #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
539 free_config_lines(&config->mime_a);
541 #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
542 free_config_lines(&config->script_i);
547 if(flag == SUBDIR_PARSE || cf == NULL) {
548 cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
550 if(flag == FIRST_PARSE)
551 bb_error_msg_and_die(bb_msg_memory_exhausted);
554 sprintf((char *)cf, "%s/%s", path, httpd_conf);
557 while((f = fopen(cf, "r")) == NULL) {
558 if(flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
559 /* config file not found, no changes to config */
562 if(config->configFile && flag == FIRST_PARSE) /* if -c option given */
563 bb_perror_msg_and_die("%s", cf);
564 flag = FIND_FROM_HTTPD_ROOT;
568 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
571 /* This could stand some work */
572 while ( (p0 = fgets(buf, sizeof(buf), f)) != NULL) {
574 for(p = p0; *p0 != 0 && *p0 != '#'; p0++) {
577 if(*p0 == ':' && c == NULL)
583 /* test for empty or strange line */
584 if (c == NULL || *c == 0)
591 /* memorize deny all */
592 config->flg_deny_all++;
594 /* skip default other "word:*" config lines */
600 else if(*p0 != 'D' && *p0 != 'A'
601 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
604 #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
607 #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
612 if(*p0 == 'A' || *p0 == 'D') {
613 /* storing current config IP line */
614 pip = calloc(1, sizeof(Htaccess_IP));
616 if(scan_ip_mask (c, &(pip->ip), &(pip->mask))) {
617 /* syntax IP{/mask} error detected, protect all */
621 pip->allow_deny = *p0;
623 /* Deny:form_IP move top */
624 pip->next = config->ip_a_d;
625 config->ip_a_d = pip;
627 /* add to bottom A:form_IP config line */
628 Htaccess_IP *prev_IP = config->ip_a_d;
630 if(prev_IP == NULL) {
631 config->ip_a_d = pip;
634 prev_IP = prev_IP->next;
641 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
643 /* make full path from httpd root / curent_path / config_line_path */
644 cf = flag == SUBDIR_PARSE ? path : "";
645 p0 = malloc(strlen(cf) + (c - buf) + 2 + strlen(c));
649 sprintf(p0, "/%s%s", cf, buf);
651 /* another call bb_simplify_path */
656 if (*cf == '/') { /* skip duplicate (or initial) slash */
658 } else if (*cf == '.') {
659 if (cf[1] == '/' || cf[1] == 0) { /* remove extra '.' */
661 } else if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == 0)) {
664 while (*--p != '/'); /* omit previous dir */
673 if ((p == p0) || (*p != '/')) { /* not a trailing slash */
674 ++p; /* so keep last character */
677 sprintf(p0, "%s:%s", p0, c);
681 #if defined(CONFIG_FEATURE_HTTPD_BASIC_AUTH) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR)
682 /* storing current config line */
683 cur = calloc(1, sizeof(Htaccess) + strlen(p0));
685 cf = strcpy(cur->before_colon, p0);
688 cur->after_colon = c;
689 #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
691 /* config .mime line move top for overwrite previous */
692 cur->next = config->mime_a;
693 config->mime_a = cur;
697 #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
698 if(*cf == '*' && cf[1] == '.') {
699 /* config script interpreter line move top for overwrite previous */
700 cur->next = config->script_i;
701 config->script_i = cur;
705 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
709 config->auth = prev = cur;
711 /* sort path, if current lenght eq or bigger then move up */
712 Htaccess *prev_hti = config->auth;
713 size_t l = strlen(cf);
716 for(hti = prev_hti; hti; hti = hti->next) {
717 if(l >= strlen(hti->before_colon)) {
718 /* insert before hti */
720 if(prev_hti != hti) {
721 prev_hti->next = cur;
729 prev_hti = prev_hti->next;
731 if(!hti) { /* not inserted, add to bottom */
743 #ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
744 /****************************************************************************
746 > $Function: encodeString()
748 * $Description: Given a string, html encode special characters.
749 * This is used for the -e command line option to provide an easy way
750 * for scripts to encode result data without confusing browsers. The
751 * returned string pointer is memory allocated by malloc().
754 * (const char *) string . . The first string to encode.
756 * $Return: (char *) . . . .. . . A pointer to the encoded string.
758 * $Errors: Returns a null string ("") if memory is not available.
760 ****************************************************************************/
761 static char *encodeString(const char *string)
763 /* take the simple route and encode everything */
764 /* could possibly scan once to get length. */
765 int len = strlen(string);
766 char *out = malloc(len * 6 + 1);
771 while ((ch = *string++)) {
772 // very simple check for what to encode
773 if (isalnum(ch)) *p++ = ch;
774 else p += sprintf(p, "&#%d;", (unsigned char) ch);
779 #endif /* CONFIG_FEATURE_HTTPD_ENCODE_URL_STR */
781 /****************************************************************************
783 > $Function: decodeString()
785 * $Description: Given a URL encoded string, convert it to plain ascii.
786 * Since decoding always makes strings smaller, the decode is done in-place.
787 * Thus, callers should strdup() the argument if they do not want the
788 * argument modified. The return is the original pointer, allowing this
789 * function to be easily used as arguments to other functions.
792 * (char *) string . . . The first string to decode.
793 * (int) flag . . . 1 if require decode '+' as ' ' for CGI
795 * $Return: (char *) . . . . A pointer to the decoded string (same as input).
799 ****************************************************************************/
800 static char *decodeString(char *orig, int flag_plus_to_space)
802 /* note that decoded string is always shorter than original */
808 if (*ptr == '+' && flag_plus_to_space) { *string++ = ' '; ptr++; }
809 else if (*ptr != '%') *string++ = *ptr++;
811 unsigned int value1, value2;
814 if(sscanf(ptr, "%1X", &value1) != 1 ||
815 sscanf(ptr+1, "%1X", &value2) != 1) {
816 if(!flag_plus_to_space)
820 value1 = value1 * 16 + value2;
821 if(value1 == '/' || value1 == 0)
833 #ifdef CONFIG_FEATURE_HTTPD_CGI
834 /****************************************************************************
836 > $Function: addEnv()
838 * $Description: Add an environment variable setting to the global list.
839 * A NAME=VALUE string is allocated, filled, and added to the list of
840 * environment settings passed to the cgi execution script.
843 * (char *) name_before_underline - The first part environment variable name.
844 * (char *) name_after_underline - The second part environment variable name.
845 * (char *) value . . The value to which the env variable is set.
849 * $Errors: Silently returns if the env runs out of space to hold the new item
851 ****************************************************************************/
852 static void addEnv(const char *name_before_underline,
853 const char *name_after_underline, const char *value)
856 const char *underline;
860 underline = *name_after_underline ? "_" : "";
861 asprintf(&s, "%s%s%s=%s", name_before_underline, underline,
862 name_after_underline, value);
868 #if defined(CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV) || !defined(CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY)
869 /* set environs SERVER_PORT and REMOTE_PORT */
870 static void addEnvPort(const char *port_name)
874 sprintf(buf, "%u", config->port);
875 addEnv(port_name, "PORT", buf);
878 #endif /* CONFIG_FEATURE_HTTPD_CGI */
881 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
882 /****************************************************************************
884 > $Function: decodeBase64()
886 > $Description: Decode a base 64 data stream as per rfc1521.
887 * Note that the rfc states that none base64 chars are to be ignored.
888 * Since the decode always results in a shorter size than the input, it is
889 * OK to pass the input arg as an output arg.
892 * (char *) Data . . . . A pointer to a base64 encoded string.
893 * Where to place the decoded data.
899 ****************************************************************************/
900 static void decodeBase64(char *Data)
903 const unsigned char *in = (const unsigned char *)Data;
904 // The decoded size will be at most 3/4 the size of the encoded
905 unsigned long ch = 0;
911 if(t >= '0' && t <= '9')
913 else if(t >= 'A' && t <= 'Z')
915 else if(t >= 'a' && t <= 'z')
929 *Data++ = (char) (ch >> 16);
930 *Data++ = (char) (ch >> 8);
940 #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
941 /****************************************************************************
943 > $Function: openServer()
945 * $Description: create a listen server socket on the designated port.
947 * $Return: (int) . . . A connection socket. -1 for errors.
951 ****************************************************************************/
952 static int openServer(void)
954 struct sockaddr_in lsocket;
957 /* create the socket right now */
958 /* inet_addr() returns a value that is already in network order */
959 memset(&lsocket, 0, sizeof(lsocket));
960 lsocket.sin_family = AF_INET;
961 lsocket.sin_addr.s_addr = INADDR_ANY;
962 lsocket.sin_port = htons(config->port) ;
963 fd = socket(AF_INET, SOCK_STREAM, 0);
965 /* tell the OS it's OK to reuse a previous address even though */
966 /* it may still be in a close down state. Allows bind to succeed. */
969 setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (void *)&on, sizeof(on)) ;
971 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)) ;
973 if (bind(fd, (struct sockaddr *)&lsocket, sizeof(lsocket)) == 0) {
975 signal(SIGCHLD, SIG_IGN); /* prevent zombie (defunct) processes */
977 bb_perror_msg_and_die("bind");
980 bb_perror_msg_and_die("create socket");
984 #endif /* CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY */
986 /****************************************************************************
988 > $Function: sendHeaders()
990 * $Description: Create and send HTTP response headers.
991 * The arguments are combined and sent as one write operation. Note that
992 * IE will puke big-time if the headers are not sent in one packet and the
993 * second packet is delayed for any reason.
996 * (HttpResponseNum) responseNum . . . The result code to send.
998 * $Return: (int) . . . . writing errors
1000 ****************************************************************************/
1001 static int sendHeaders(HttpResponseNum responseNum)
1003 char *buf = config->buf;
1004 const char *responseString = "";
1005 const char *infoString = 0;
1006 const char *mime_type;
1008 time_t timer = time(0);
1013 i < (sizeof(httpResponseNames)/sizeof(httpResponseNames[0])); i++) {
1014 if (httpResponseNames[i].type == responseNum) {
1015 responseString = httpResponseNames[i].name;
1016 infoString = httpResponseNames[i].info;
1020 /* error message is HTML */
1021 mime_type = responseNum == HTTP_OK ?
1022 config->httpd_found.found_mime_type : "text/html";
1024 /* emit the current date */
1025 strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&timer));
1027 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
1028 "Date: %s\r\nConnection: close\r\n",
1029 responseNum, responseString, mime_type, timeStr);
1031 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
1032 if (responseNum == HTTP_UNAUTHORIZED) {
1033 len += sprintf(buf+len, "WWW-Authenticate: Basic realm=\"%s\"\r\n",
1037 if(responseNum == HTTP_MOVED_TEMPORARILY) {
1038 len += sprintf(buf+len, "Location: %s/%s%s\r\n",
1039 config->httpd_found.found_moved_temporarily,
1040 (config->query ? "?" : ""),
1041 (config->query ? config->query : ""));
1044 if (config->ContentLength != -1) { /* file */
1045 strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&config->last_mod));
1046 len += sprintf(buf+len, "Last-Modified: %s\r\n%s " cont_l_fmt "\r\n",
1047 timeStr, Content_length, cont_l_type config->ContentLength);
1049 strcat(buf, "\r\n");
1052 len += sprintf(buf+len,
1053 "<HEAD><TITLE>%d %s</TITLE></HEAD>\n"
1054 "<BODY><H1>%d %s</H1>\n%s\n</BODY>\n",
1055 responseNum, responseString,
1056 responseNum, responseString, infoString);
1059 fprintf(stderr, "Headers: '%s'", buf);
1061 return bb_full_write(a_c_w, buf, len);
1064 /****************************************************************************
1066 > $Function: getLine()
1068 * $Description: Read from the socket until an end of line char found.
1070 * Characters are read one at a time until an eol sequence is found.
1072 * $Return: (int) . . . . number of characters read. -1 if error.
1074 ****************************************************************************/
1075 static int getLine(void)
1078 char *buf = config->buf;
1080 while (read(a_c_r, buf + count, 1) == 1) {
1081 if (buf[count] == '\r') continue;
1082 if (buf[count] == '\n') {
1086 if(count < (MAX_MEMORY_BUFF-1)) /* check owerflow */
1089 if (count) return count;
1093 #ifdef CONFIG_FEATURE_HTTPD_CGI
1094 /****************************************************************************
1096 > $Function: sendCgi()
1098 * $Description: Execute a CGI script and send it's stdout back
1100 * Environment variables are set up and the script is invoked with pipes
1101 * for stdin/stdout. If a post is being done the script is fed the POST
1102 * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1105 * (const char *) url . . . . . . The requested URL (with leading /).
1106 * (int bodyLen) . . . . . . . . Length of the post body.
1107 * (const char *cookie) . . . . . For set HTTP_COOKIE.
1108 * (const char *content_type) . . For set CONTENT_TYPE.
1111 * $Return: (char *) . . . . A pointer to the decoded string (same as input).
1115 ****************************************************************************/
1116 static int sendCgi(const char *url,
1117 const char *request, int bodyLen, const char *cookie,
1118 const char *content_type)
1120 int fromCgi[2]; /* pipe for reading data from CGI */
1121 int toCgi[2]; /* pipe for sending data to CGI */
1123 static char * argp[] = { 0, 0 };
1130 if (pipe(fromCgi) != 0) {
1133 if (pipe(toCgi) != 0) {
1146 char *purl = strdup( url );
1147 char realpath_buff[MAXPATHLEN];
1155 dup2(inFd, 0); // replace stdin with the pipe
1156 dup2(outFd, 1); // replace stdout with the pipe
1158 dup2(outFd, 2); // replace stderr with the pipe
1169 while((script = strchr( script + 1, '/' )) != NULL) {
1170 /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
1174 if(is_directory(purl + 1, 1, &sb) == 0) {
1175 /* not directory, found script.cgi/PATH_INFO */
1179 *script = '/'; /* is directory, find next '/' */
1181 addEnv("PATH", "INFO", script); /* set /PATH_INFO or NULL */
1182 addEnv("PATH", "", getenv("PATH"));
1183 addEnv("REQUEST", "METHOD", request);
1185 char *uri = alloca(strlen(purl) + 2 + strlen(config->query));
1187 sprintf(uri, "%s?%s", purl, config->query);
1188 addEnv("REQUEST", "URI", uri);
1190 addEnv("REQUEST", "URI", purl);
1193 *script = '\0'; /* reduce /PATH_INFO */
1194 /* SCRIPT_FILENAME required by PHP in CGI mode */
1195 if(realpath(purl + 1, realpath_buff))
1196 addEnv("SCRIPT", "FILENAME", realpath_buff);
1199 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1200 addEnv("SCRIPT_NAME", "", purl);
1201 addEnv("QUERY_STRING", "", config->query);
1202 addEnv("SERVER", "SOFTWARE", httpdVersion);
1203 addEnv("SERVER", "PROTOCOL", "HTTP/1.0");
1204 addEnv("GATEWAY_INTERFACE", "", "CGI/1.1");
1205 addEnv("REMOTE", "ADDR", config->rmt_ip_str);
1206 #ifdef CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1207 addEnvPort("REMOTE");
1212 sprintf(sbl, "%d", bodyLen);
1213 addEnv("CONTENT", "LENGTH", sbl);
1216 addEnv("HTTP", "COOKIE", cookie);
1218 addEnv("CONTENT", "TYPE", content_type);
1219 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
1220 if(config->remoteuser) {
1221 addEnv("REMOTE", "USER", config->remoteuser);
1222 addEnv("AUTH_TYPE", "", "Basic");
1226 addEnv("HTTP", "REFERER", config->referer);
1228 /* set execve argp[0] without path */
1229 argp[0] = strrchr( purl, '/' ) + 1;
1230 /* but script argp[0] must have absolute path and chdiring to this */
1231 if(*realpath_buff) {
1232 script = strrchr(realpath_buff, '/');
1235 if(chdir(realpath_buff) == 0) {
1236 // now run the program. If it fails,
1237 // use _exit() so no destructors
1238 // get called and make a mess.
1239 #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1240 char *interpr = NULL;
1241 char *suffix = strrchr(purl, '.');
1245 for (cur = config->script_i; cur; cur = cur->next)
1246 if(strcmp(cur->before_colon + 1, suffix) == 0) {
1247 interpr = cur->after_colon;
1253 #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1255 execv(interpr, argp);
1258 execv(realpath_buff, argp);
1262 #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
1263 config->accepted_socket = 1; /* send to stdout */
1265 sendHeaders(HTTP_NOT_FOUND);
1272 /* parent process */
1274 size_t post_readed_size = 0, post_readed_idx = 0;
1280 signal(SIGPIPE, SIG_IGN);
1291 FD_SET(inFd, &readSet);
1292 if(bodyLen > 0 || post_readed_size > 0) {
1293 FD_SET(outFd, &writeSet);
1294 nfound = outFd > inFd ? outFd : inFd;
1295 if(post_readed_size == 0) {
1296 FD_SET(a_c_r, &readSet);
1300 /* Now wait on the set of sockets! */
1301 nfound = select(nfound + 1, &readSet, &writeSet, 0, NULL);
1307 nfound = select(inFd + 1, &readSet, 0, 0, NULL);
1311 if (waitpid(pid, &status, WNOHANG) > 0) {
1314 if (WIFEXITED(status))
1315 bb_error_msg("piped has exited with status=%d", WEXITSTATUS(status));
1316 if (WIFSIGNALED(status))
1317 bb_error_msg("piped has exited with signal=%d", WTERMSIG(status));
1321 } else if(post_readed_size > 0 && FD_ISSET(outFd, &writeSet)) {
1322 count = bb_full_write(outFd, wbuf + post_readed_idx, post_readed_size);
1324 post_readed_size -= count;
1325 post_readed_idx += count;
1326 if(post_readed_size == 0)
1327 post_readed_idx = 0;
1329 post_readed_size = post_readed_idx = bodyLen = 0; /* broken pipe to CGI */
1331 } else if(bodyLen > 0 && post_readed_size == 0 && FD_ISSET(a_c_r, &readSet)) {
1332 count = bodyLen > (int)sizeof(wbuf) ? (int)sizeof(wbuf) : bodyLen;
1333 count = safe_read(a_c_r, wbuf, count);
1335 post_readed_size += count;
1338 bodyLen = 0; /* closed */
1341 if(FD_ISSET(inFd, &readSet)) {
1343 char *rbuf = config->buf;
1346 # define PIPESIZE 4096 /* amount of buffering in a pipe */
1348 # define PIPESIZE PIPE_BUF
1350 #if PIPESIZE >= MAX_MEMORY_BUFF
1351 # error "PIPESIZE >= MAX_MEMORY_BUFF"
1354 // There is something to read
1355 count = safe_read(inFd, rbuf, PIPESIZE);
1361 /* check to see if the user script added headers */
1362 if(strncmp(rbuf, "HTTP/1.0 200 OK\r\n", 4) != 0) {
1363 bb_full_write(s, "HTTP/1.0 200 OK\r\n", 17);
1365 if (strstr(rbuf, "ontent-") == 0) {
1366 bb_full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1370 if (bb_full_write(s, rbuf, count) != count)
1374 fprintf(stderr, "cgi read %d bytes\n", count);
1382 #endif /* CONFIG_FEATURE_HTTPD_CGI */
1384 /****************************************************************************
1386 > $Function: sendFile()
1388 * $Description: Send a file response to an HTTP request
1391 * (const char *) url . . The URL requested.
1393 * $Return: (int) . . . . . . Always 0.
1395 ****************************************************************************/
1396 static int sendFile(const char *url)
1400 const char * const * table;
1401 const char * try_suffix;
1403 suffix = strrchr(url, '.');
1405 for (table = suffixTable; *table; table += 2)
1406 if(suffix != NULL && (try_suffix = strstr(*table, suffix)) != 0) {
1407 try_suffix += strlen(suffix);
1408 if(*try_suffix == 0 || *try_suffix == '.')
1411 /* also, if not found, set default as "application/octet-stream"; */
1412 config->httpd_found.found_mime_type = *(table+1);
1413 #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1417 for (cur = config->mime_a; cur; cur = cur->next) {
1418 if(strcmp(cur->before_colon, suffix) == 0) {
1419 config->httpd_found.found_mime_type = cur->after_colon;
1424 #endif /* CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */
1427 fprintf(stderr, "Sending file '%s' Content-type: %s\n",
1428 url, config->httpd_found.found_mime_type);
1431 f = open(url, O_RDONLY);
1434 char *buf = config->buf;
1436 sendHeaders(HTTP_OK);
1437 while ((count = bb_full_read(f, buf, MAX_MEMORY_BUFF)) > 0) {
1438 if (bb_full_write(a_c_w, buf, count) != count)
1444 bb_perror_msg("Unable to open '%s'", url);
1446 sendHeaders(HTTP_NOT_FOUND);
1452 static int checkPermIP(void)
1456 /* This could stand some work */
1457 for (cur = config->ip_a_d; cur; cur = cur->next) {
1459 fprintf(stderr, "checkPermIP: '%s' ? ", config->rmt_ip_str);
1460 fprintf(stderr, "'%u.%u.%u.%u/%u.%u.%u.%u'\n",
1461 (unsigned char)(cur->ip >> 24),
1462 (unsigned char)(cur->ip >> 16),
1463 (unsigned char)(cur->ip >> 8),
1465 (unsigned char)(cur->mask >> 24),
1466 (unsigned char)(cur->mask >> 16),
1467 (unsigned char)(cur->mask >> 8),
1470 if((config->rmt_ip & cur->mask) == cur->ip)
1471 return cur->allow_deny == 'A'; /* Allow/Deny */
1474 /* if unconfigured, return 1 - access from all */
1475 return !config->flg_deny_all;
1478 /****************************************************************************
1480 > $Function: checkPerm()
1482 * $Description: Check the permission file for access password protected.
1484 * If config file isn't present, everything is allowed.
1485 * Entries are of the form you can see example from header source
1488 * (const char *) path . . . . The file path.
1489 * (const char *) request . . . User information to validate.
1491 * $Return: (int) . . . . . . . . . 1 if request OK, 0 otherwise.
1493 ****************************************************************************/
1495 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
1496 static int checkPerm(const char *path, const char *request)
1502 const char *prev = NULL;
1504 /* This could stand some work */
1505 for (cur = config->auth; cur; cur = cur->next) {
1506 p0 = cur->before_colon;
1507 if(prev != NULL && strcmp(prev, p0) != 0)
1508 continue; /* find next identical */
1509 p = cur->after_colon;
1511 fprintf(stderr,"checkPerm: '%s' ? '%s'\n", p0, request);
1514 size_t l = strlen(p0);
1516 if(strncmp(p0, path, l) == 0 &&
1517 (l == 1 || path[l] == '/' || path[l] == 0)) {
1519 /* path match found. Check request */
1520 /* for check next /path:user:password */
1522 u = strchr(request, ':');
1524 /* bad request, ':' required */
1528 #ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5
1533 if(strncmp(p, request, u-request) != 0) {
1534 /* user uncompared */
1537 pp = strchr(p, ':');
1538 if(pp && pp[1] == '$' && pp[2] == '1' &&
1539 pp[3] == '$' && pp[4]) {
1541 cipher = pw_encrypt(u+1, pp);
1542 if (strcmp(cipher, pp) == 0)
1543 goto set_remoteuser_var; /* Ok */
1549 if (strcmp(p, request) == 0) {
1550 #ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5
1553 config->remoteuser = strdup(request);
1554 if(config->remoteuser)
1555 config->remoteuser[(u - request)] = 0;
1563 return prev == NULL;
1566 #endif /* CONFIG_FEATURE_HTTPD_BASIC_AUTH */
1568 /****************************************************************************
1570 > $Function: handle_sigalrm()
1572 * $Description: Handle timeouts
1574 ****************************************************************************/
1577 handle_sigalrm( int sig )
1579 sendHeaders(HTTP_REQUEST_TIMEOUT);
1580 config->alarm_signaled = sig;
1583 /****************************************************************************
1585 > $Function: handleIncoming()
1587 * $Description: Handle an incoming http request.
1589 ****************************************************************************/
1590 static void handleIncoming(void)
1592 char *buf = config->buf;
1599 #ifdef CONFIG_FEATURE_HTTPD_CGI
1600 const char *prequest = request_GET;
1603 char *content_type = 0;
1605 #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
1610 struct sigaction sa;
1612 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
1613 int credentials = -1; /* if not requred this is Ok */
1616 sa.sa_handler = handle_sigalrm;
1617 sigemptyset(&sa.sa_mask);
1618 sa.sa_flags = 0; /* no SA_RESTART */
1619 sigaction(SIGALRM, &sa, NULL);
1624 (void) alarm( TIMEOUT );
1628 purl = strpbrk(buf, " \t");
1631 sendHeaders(HTTP_BAD_REQUEST);
1635 #ifdef CONFIG_FEATURE_HTTPD_CGI
1636 if(strcasecmp(buf, prequest) != 0) {
1638 if(strcasecmp(buf, prequest) != 0) {
1639 sendHeaders(HTTP_NOT_IMPLEMENTED);
1644 if(strcasecmp(buf, request_GET) != 0) {
1645 sendHeaders(HTTP_NOT_IMPLEMENTED);
1650 count = sscanf(purl, " %[^ ] HTTP/%d.%*d", buf, &blank);
1652 if (count < 1 || buf[0] != '/') {
1653 /* Garbled request/URL */
1656 url = alloca(strlen(buf) + 12); /* + sizeof("/index.html\0") */
1658 sendHeaders(HTTP_INTERNAL_SERVER_ERROR);
1662 /* extract url args if present */
1663 test = strchr(url, '?');
1666 config->query = test;
1669 test = decodeString(url, 0);
1672 if(test == (buf+1)) {
1673 sendHeaders(HTTP_NOT_FOUND);
1676 /* algorithm stolen from libbb bb_simplify_path(),
1677 but don`t strdup and reducing trailing slash and protect out root */
1682 if (*test == '/') { /* skip duplicate (or initial) slash */
1684 } else if (*test == '.') {
1685 if (test[1] == '/' || test[1] == 0) { /* skip extra '.' */
1687 } else if ((test[1] == '.') && (test[2] == '/' || test[2] == 0)) {
1690 /* protect out root */
1693 while (*--purl != '/'); /* omit previous dir */
1701 *++purl = 0; /* so keep last character */
1702 test = purl; /* end ptr */
1704 /* If URL is directory, adding '/' */
1705 if(test[-1] != '/') {
1706 if ( is_directory(url + 1, 1, &sb) ) {
1707 config->httpd_found.found_moved_temporarily = url;
1711 fprintf(stderr, "url='%s', args=%s\n", url, config->query);
1715 ip_allowed = checkPermIP();
1716 while(ip_allowed && (test = strchr( test + 1, '/' )) != NULL) {
1717 /* have path1/path2 */
1719 if( is_directory(url + 1, 1, &sb) ) {
1720 /* may be having subdir config */
1721 parse_conf(url + 1, SUBDIR_PARSE);
1722 ip_allowed = checkPermIP();
1727 // read until blank line for HTTP version specified, else parse immediate
1735 fprintf(stderr, "Header: '%s'\n", buf);
1738 #ifdef CONFIG_FEATURE_HTTPD_CGI
1739 /* try and do our best to parse more lines */
1740 if ((strncasecmp(buf, Content_length, 15) == 0)) {
1741 if(prequest != request_GET)
1742 length = strtol(buf + 15, 0, 0); // extra read only for POST
1743 } else if ((strncasecmp(buf, "Cookie:", 7) == 0)) {
1744 for(test = buf + 7; isspace(*test); test++)
1746 cookie = strdup(test);
1747 } else if ((strncasecmp(buf, "Content-Type:", 13) == 0)) {
1748 for(test = buf + 13; isspace(*test); test++)
1750 content_type = strdup(test);
1751 } else if ((strncasecmp(buf, "Referer:", 8) == 0)) {
1752 for(test = buf + 8; isspace(*test); test++)
1754 config->referer = strdup(test);
1758 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
1759 if (strncasecmp(buf, "Authorization:", 14) == 0) {
1760 /* We only allow Basic credentials.
1761 * It shows up as "Authorization: Basic <userid:password>" where
1762 * the userid:password is base64 encoded.
1764 for(test = buf + 14; isspace(*test); test++)
1766 if (strncasecmp(test, "Basic", 5) != 0)
1769 test += 5; /* decodeBase64() skiping space self */
1771 credentials = checkPerm(url, test);
1773 #endif /* CONFIG_FEATURE_HTTPD_BASIC_AUTH */
1775 } /* while extra header reading */
1778 if(config->alarm_signaled)
1781 if (strcmp(strrchr(url, '/') + 1, httpd_conf) == 0 || ip_allowed == 0) {
1782 /* protect listing [/path]/httpd_conf or IP deny */
1783 #ifdef CONFIG_FEATURE_HTTPD_CGI
1784 FORBIDDEN: /* protect listing /cgi-bin */
1786 sendHeaders(HTTP_FORBIDDEN);
1790 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
1791 if (credentials <= 0 && checkPerm(url, ":") == 0) {
1792 sendHeaders(HTTP_UNAUTHORIZED);
1797 if(config->httpd_found.found_moved_temporarily) {
1798 sendHeaders(HTTP_MOVED_TEMPORARILY);
1800 /* clear unforked memory flag */
1801 config->httpd_found.found_moved_temporarily = NULL;
1806 test = url + 1; /* skip first '/' */
1808 #ifdef CONFIG_FEATURE_HTTPD_CGI
1809 /* if strange Content-Length */
1813 if (strncmp(test, "cgi-bin", 7) == 0) {
1814 if(test[7] == '/' && test[8] == 0)
1815 goto FORBIDDEN; // protect listing cgi-bin/
1816 sendCgi(url, prequest, length, cookie, content_type);
1818 if (prequest != request_GET)
1819 sendHeaders(HTTP_NOT_IMPLEMENTED);
1821 #endif /* CONFIG_FEATURE_HTTPD_CGI */
1823 strcpy(purl, "index.html");
1824 if ( stat(test, &sb ) == 0 ) {
1825 config->ContentLength = sb.st_size;
1826 config->last_mod = sb.st_mtime;
1829 #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
1830 /* unset if non inetd looped */
1831 config->ContentLength = -1;
1834 #ifdef CONFIG_FEATURE_HTTPD_CGI
1842 #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
1843 /* from inetd don`t looping: freeing, closing automatic from exit always */
1845 fprintf(stderr, "closing socket\n");
1847 # ifdef CONFIG_FEATURE_HTTPD_CGI
1850 free(config->referer);
1851 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
1852 free(config->remoteuser);
1855 shutdown(a_c_w, SHUT_WR);
1857 /* Properly wait for remote to closed */
1859 FD_SET (a_c_w, &s_fd) ;
1864 retval = select (a_c_w + 1, &s_fd, NULL, NULL, &tv);
1865 } while (retval > 0 && (read (a_c_w, buf, sizeof (config->buf)) > 0));
1867 shutdown(a_c_r, SHUT_RD);
1868 close(config->accepted_socket);
1869 #endif /* CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY */
1872 /****************************************************************************
1874 > $Function: miniHttpd()
1876 * $Description: The main http server function.
1878 * Given an open socket fildes, listen for new connections and farm out
1879 * the processing as a forked process.
1882 * (int) server. . . The server socket fildes.
1884 * $Return: (int) . . . . Always 0.
1886 ****************************************************************************/
1887 #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
1888 static int miniHttpd(int server)
1890 fd_set readfd, portfd;
1893 FD_SET(server, &portfd);
1895 /* copy the ports we are watching to the readfd set */
1899 /* Now wait INDEFINITELY on the set of sockets! */
1900 if (select(server + 1, &readfd, 0, 0, 0) > 0) {
1901 if (FD_ISSET(server, &readfd)) {
1903 struct sockaddr_in fromAddr;
1905 socklen_t fromAddrLen = sizeof(fromAddr);
1906 int s = accept(server,
1907 (struct sockaddr *)&fromAddr, &fromAddrLen);
1912 config->accepted_socket = s;
1913 config->rmt_ip = ntohl(fromAddr.sin_addr.s_addr);
1914 #if ENABLE_FEATURE_HTTPD_CGI || DEBUG
1915 sprintf(config->rmt_ip_str, "%u.%u.%u.%u",
1916 (unsigned char)(config->rmt_ip >> 24),
1917 (unsigned char)(config->rmt_ip >> 16),
1918 (unsigned char)(config->rmt_ip >> 8),
1919 config->rmt_ip & 0xff);
1920 config->port = ntohs(fromAddr.sin_port);
1922 bb_error_msg("connection from IP=%s, port %u\n",
1923 config->rmt_ip_str, config->port);
1925 #endif /* CONFIG_FEATURE_HTTPD_CGI */
1927 /* set the KEEPALIVE option to cull dead connections */
1929 setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, sizeof (on));
1935 /* This is the spawned thread */
1936 #ifdef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1937 /* protect reload config, may be confuse checking */
1938 signal(SIGHUP, SIG_IGN);
1955 static int miniHttpd(void)
1957 struct sockaddr_in fromAddrLen;
1958 socklen_t sinlen = sizeof (struct sockaddr_in);
1960 getpeername (0, (struct sockaddr *)&fromAddrLen, &sinlen);
1961 config->rmt_ip = ntohl(fromAddrLen.sin_addr.s_addr);
1962 #if ENABLE_FEATURE_HTTPD_CGI
1963 sprintf(config->rmt_ip_str, "%u.%u.%u.%u",
1964 (unsigned char)(config->rmt_ip >> 24),
1965 (unsigned char)(config->rmt_ip >> 16),
1966 (unsigned char)(config->rmt_ip >> 8),
1967 config->rmt_ip & 0xff);
1969 config->port = ntohs(fromAddrLen.sin_port);
1973 #endif /* CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY */
1975 #ifdef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1976 static void sighup_handler(int sig)
1979 struct sigaction sa;
1981 parse_conf(default_path_httpd_conf,
1982 sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
1983 sa.sa_handler = sighup_handler;
1984 sigemptyset(&sa.sa_mask);
1985 sa.sa_flags = SA_RESTART;
1986 sigaction(SIGHUP, &sa, NULL);
1990 enum httpd_opts_nums {
1991 c_opt_config_file = 0,
1994 USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
1995 USE_FEATURE_HTTPD_BASIC_AUTH(r_opt_realm,)
1996 USE_FEATURE_HTTPD_AUTH_MD5(m_opt_md5,)
1997 USE_FEATURE_HTTPD_SETUID(u_opt_setuid,)
1998 SKIP_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY(p_opt_port,)
2001 static const char httpd_opts[]="c:d:h:"
2002 USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2003 USE_FEATURE_HTTPD_BASIC_AUTH("r:")
2004 USE_FEATURE_HTTPD_AUTH_MD5("m:")
2005 USE_FEATURE_HTTPD_SETUID("u:")
2006 SKIP_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY("p:");
2008 #define OPT_CONFIG_FILE (1<<c_opt_config_file)
2009 #define OPT_DECODE_URL (1<<d_opt_decode_url)
2010 #define OPT_HOME_HTTPD (1<<h_opt_home_httpd)
2012 #define OPT_ENCODE_URL USE_FEATURE_HTTPD_ENCODE_URL_STR((1<<e_opt_encode_url)) \
2013 SKIP_FEATURE_HTTPD_ENCODE_URL_STR(0)
2015 #define OPT_REALM USE_FEATURE_HTTPD_BASIC_AUTH((1<<r_opt_realm)) \
2016 SKIP_FEATURE_HTTPD_BASIC_AUTH(0)
2018 #define OPT_MD5 USE_FEATURE_HTTPD_AUTH_MD5((1<<m_opt_md5)) \
2019 SKIP_FEATURE_HTTPD_AUTH_MD5(0)
2021 #define OPT_SETUID USE_FEATURE_HTTPD_SETUID((1<<u_opt_setuid)) \
2022 SKIP_FEATURE_HTTPD_SETUID(0)
2024 #define OPT_PORT SKIP_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY((1<<p_opt_port)) \
2025 USE_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY(0)
2028 #ifdef HTTPD_STANDALONE
2029 int main(int argc, char *argv[])
2031 int httpd_main(int argc, char *argv[])
2035 const char *home_httpd = home;
2036 char *url_for_decode;
2037 USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2038 SKIP_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY(const char *s_port;)
2039 SKIP_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY(int server;)
2041 USE_FEATURE_HTTPD_SETUID(const char *s_uid;)
2042 USE_FEATURE_HTTPD_SETUID(long uid = -1;)
2044 USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2046 config = xcalloc(1, sizeof(*config));
2047 #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
2048 config->realm = "Web Server Authentication";
2051 #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
2055 config->ContentLength = -1;
2057 opt = bb_getopt_ulflags(argc, argv, httpd_opts,
2058 &(config->configFile), &url_for_decode, &home_httpd
2059 USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2060 USE_FEATURE_HTTPD_BASIC_AUTH(, &(config->realm))
2061 USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
2062 USE_FEATURE_HTTPD_SETUID(, &s_uid)
2063 SKIP_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY(, &s_port)
2066 if(opt & OPT_DECODE_URL) {
2067 printf("%s", decodeString(url_for_decode, 1));
2070 #ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
2071 if(opt & OPT_ENCODE_URL) {
2072 printf("%s", encodeString(url_for_encode));
2076 #ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5
2078 printf("%s\n", pw_encrypt(pass, "$1$"));
2082 #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
2084 config->port = bb_xgetlarg(s_port, 10, 1, 0xffff);
2085 #ifdef CONFIG_FEATURE_HTTPD_SETUID
2086 if(opt & OPT_SETUID) {
2089 uid = strtol(s_uid, &e, 0);
2092 uid = bb_xgetpwnam(s_uid);
2098 if(chdir(home_httpd)) {
2099 bb_perror_msg_and_die("can`t chdir to %s", home_httpd);
2101 #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
2102 server = openServer();
2103 # ifdef CONFIG_FEATURE_HTTPD_SETUID
2104 /* drop privileges */
2110 #ifdef CONFIG_FEATURE_HTTPD_CGI
2112 char *p = getenv("PATH");
2118 setenv("PATH", p, 1);
2119 # ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
2120 addEnvPort("SERVER");
2125 #ifdef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2128 parse_conf(default_path_httpd_conf, FIRST_PARSE);
2131 #if !ENABLE_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
2133 if (daemon(1, 0) < 0) /* don`t change curent directory */
2134 bb_perror_msg_and_die("daemon");
2136 return miniHttpd(server);