path: root/networking/httpd.c (plain)
blob: 621d9cddc6aef67b005deb4b8b39725c8d0428b9

1	/* vi: set sw=4 ts=4: */
2	/*
3	* httpd implementation for busybox
4	*
5	* Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org>
6	* Copyright (C) 2003-2006 Vladimir Oleynik <dzo@simtreas.ru>
7	*
8	* Licensed under GPLv2 or later, see file LICENSE in this source tree.
9	*
10	*****************************************************************************
11	*
12	* Typical usage:
13	* For non root user:
14	* httpd -p 8080 -h $HOME/public_html
15	* For daemon start from rc script with uid=0:
16	* httpd -u www
17	* which is equivalent to (assuming user www has uid 80):
18	* httpd -p 80 -u 80 -h $PWD -c /etc/httpd.conf -r "Web Server Authentication"
19	*
20	* When an url starts with "/cgi-bin/" it is assumed to be a cgi script.
21	* The server changes directory to the location of the script and executes it
22	* after setting QUERY_STRING and other environment variables.
23	*
24	* If directory URL is given, no index.html is found and CGI support is enabled,
25	* cgi-bin/index.cgi will be run. Directory to list is ../$QUERY_STRING.
26	* See httpd_indexcgi.c for an example GCI code.
27	*
28	* Doc:
29	* "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html
30	*
31	* The applet can also be invoked as an url arg decoder and html text encoder
32	* as follows:
33	* foo=`httpd -d $foo` # decode "Hello%20World" as "Hello World"
34	* bar=`httpd -e "<Hello World>"` # encode as "&#60Hello&#32World&#62"
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
37	* for page display.
38	*
39	* httpd.conf has the following format:
40	*
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
49	*
50	* P:/url:[http://]hostname[:port]/new/path
51	* # When /urlXXXXXX is requested, reverse proxy
52	* # it to http://hostname[:port]/new/pathXXXXXX
53	*
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
61	*
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.
67	*
68	* Example:
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
74	*
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)
79	*
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.
82	*
83	* subdir paths are relative to the containing subdir and thus cannot
84	* affect the parent rules.
85	*
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.
89	*
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.
94	*
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.
98	*
99	*/
100	/* TODO: use TCP_CORK, parse_config() */
101
102	//usage:#define httpd_trivial_usage
103	//usage: "[-ifv[v]]"
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"
126
127	#include "libbb.h"
128	#if ENABLE_PAM
129	/* PAM may include <locale.h>. We may need to undefine bbox's stub define: */
130	# undef setlocale
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>
135	#endif
136	#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
137	# include <sys/sendfile.h>
138	#endif
139	/* amount of buffering in a pipe */
140	#ifndef PIPE_BUF
141	# define PIPE_BUF 4096
142	#endif
143
144	#define DEBUG 0
145
146	#define IOBUF_SIZE 8192
147	#if PIPE_BUF >= IOBUF_SIZE
148	# error "PIPE_BUF >= IOBUF_SIZE"
149	#endif
150
151	#define HEADER_READ_TIMEOUT 60
152
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";
157
158	typedef struct has_next_ptr {
159	struct has_next_ptr *next;
160	} has_next_ptr;
161
162	/* Must have "next" as a first member */
163	typedef struct Htaccess {
164	struct Htaccess *next;
165	char *after_colon;
166	char before_colon[1]; /* really bigger, must be last */
167	} Htaccess;
168
169	/* Must have "next" as a first member */
170	typedef struct Htaccess_IP {
171	struct Htaccess_IP *next;
172	unsigned ip;
173	unsigned mask;
174	int allow_deny;
175	} Htaccess_IP;
176
177	/* Must have "next" as a first member */
178	typedef struct Htaccess_Proxy {
179	struct Htaccess_Proxy *next;
180	char *url_from;
181	char *host_port;
182	char *url_to;
183	} Htaccess_Proxy;
184
185	enum {
186	HTTP_OK = 200,
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,
196	HTTP_CONTINUE = 100,
197	#if 0 /* future use */
198	HTTP_SWITCHING_PROTOCOLS = 101,
199	HTTP_CREATED = 201,
200	HTTP_ACCEPTED = 202,
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 */
209	#endif
210	};
211
212	static const uint16_t http_response_type[] ALIGN2 = {
213	HTTP_OK,
214	#if ENABLE_FEATURE_HTTPD_RANGES
215	HTTP_PARTIAL_CONTENT,
216	#endif
217	HTTP_MOVED_TEMPORARILY,
218	HTTP_REQUEST_TIMEOUT,
219	HTTP_NOT_IMPLEMENTED,
220	#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
221	HTTP_UNAUTHORIZED,
222	#endif
223	HTTP_NOT_FOUND,
224	HTTP_BAD_REQUEST,
225	HTTP_FORBIDDEN,
226	HTTP_INTERNAL_SERVER_ERROR,
227	#if 0 /* not implemented */
228	HTTP_CREATED,
229	HTTP_ACCEPTED,
230	HTTP_NO_CONTENT,
231	HTTP_MULTIPLE_CHOICES,
232	HTTP_MOVED_PERMANENTLY,
233	HTTP_NOT_MODIFIED,
234	HTTP_BAD_GATEWAY,
235	HTTP_SERVICE_UNAVAILABLE,
236	#endif
237	};
238
239	static const struct {
240	const char *name;
241	const char *info;
242	} http_response[ARRAY_SIZE(http_response_type)] = {
243	{ "OK", NULL },
244	#if ENABLE_FEATURE_HTTPD_RANGES
245	{ "Partial Content", NULL },
246	#endif
247	{ "Found", 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", "" },
252	#endif
253	{ "Not Found", "The requested URL was not found" },
254	{ "Bad Request", "Unsupported method" },
255	{ "Forbidden", "" },
256	{ "Internal Server Error", "Internal Server Error" },
257	#if 0 /* not implemented */
258	{ "Created" },
259	{ "Accepted" },
260	{ "No Content" },
261	{ "Multiple Choices" },
262	{ "Moved Permanently" },
263	{ "Not Modified" },
264	{ "Bad Gateway", "" },
265	{ "Service Unavailable", "" },
266	#endif
267	};
268
269	struct globals {
270	int verbose; /* must be int (used by getopt32) */
271	smallint flg_deny_all;
272
273	unsigned rmt_ip; /* used for IP-based allow/deny rules */
274	time_t last_mod;
275	char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */
276	const char *bind_addr_or_port;
277
278	const char *g_query;
279	const char *opt_c_configFile;
280	const char *home_httpd;
281	const char *index_page;
282
283	const char *found_mime_type;
284	const char *found_moved_temporarily;
285	Htaccess_IP *ip_a_d; /* config allow/deny lines */
286
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;)
294
295	off_t file_size; /* -1 - unknown */
296	#if ENABLE_FEATURE_HTTPD_RANGES
297	off_t range_start;
298	off_t range_end;
299	off_t range_len;
300	#endif
301
302	#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
303	Htaccess *g_auth; /* config user:password lines */
304	#endif
305	Htaccess *mime_a; /* config mime types */
306	#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
307	Htaccess *script_i; /* config script interpreters */
308	#endif
309	char *iobuf; /* [IOBUF_SIZE] */
310	#define hdr_buf bb_common_bufsiz1
311	char *hdr_ptr;
312	int hdr_cnt;
313	#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
314	const char *http_error_page[ARRAY_SIZE(http_response_type)];
315	#endif
316	#if ENABLE_FEATURE_HTTPD_PROXY
317	Htaccess_Proxy *proxy;
318	#endif
319	#if ENABLE_FEATURE_HTTPD_GZIP
320	/* client can handle gzip / we are going to send gzip */
321	smallint content_gzip;
322	#endif
323	};
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 )
349	#else
350	enum {
351	range_start = -1,
352	range_end = MAXINT(off_t) - 1,
353	range_len = MAXINT(off_t),
354	};
355	#endif
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 )
367	#else
368	# define content_gzip 0
369	#endif
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; \
376	file_size = -1; \
377	} while (0)
378
379
380	#define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
381
382	/* Prototypes */
383	enum {
384	SEND_HEADERS = (1 << 0),
385	SEND_BODY = (1 << 1),
386	SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY,
387	};
388	static void send_file_and_exit(const char *url, int what) NORETURN;
389
390	static void free_llist(has_next_ptr **pptr)
391	{
392	has_next_ptr *cur = *pptr;
393	while (cur) {
394	has_next_ptr *t = cur;
395	cur = cur->next;
396	free(t);
397	}
398	*pptr = NULL;
399	}
400
401	static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
402	{
403	free_llist((has_next_ptr**)pptr);
404	}
405
406	static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
407	{
408	free_llist((has_next_ptr**)pptr);
409	}
410
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)
414	{
415	const char *p = *strp;
416	int auto_mask = 8;
417	unsigned ip = 0;
418	int j;
419
420	if (*p == '/')
421	return -auto_mask;
422
423	for (j = 0; j < 4; j++) {
424	unsigned octet;
425
426	if ((*p < '0' || *p > '9') && *p != '/' && *p)
427	return -auto_mask;
428	octet = 0;
429	while (*p >= '0' && *p <= '9') {
430	octet *= 10;
431	octet += *p - '0';
432	if (octet > 255)
433	return -auto_mask;
434	p++;
435	}
436	if (*p == '.')
437	p++;
438	if (*p != '/' && *p)
439	auto_mask += 8;
440	ip = (ip << 8) | octet;
441	}
442	if (*p) {
443	if (*p != endc)
444	return -auto_mask;
445	p++;
446	if (*p == '\0')
447	return -auto_mask;
448	}
449	*ipp = ip;
450	*strp = p;
451	return auto_mask;
452	}
453
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)
456	{
457	int i;
458	unsigned mask;
459	char *p;
460
461	i = scan_ip(&str, ipp, '/');
462	if (i < 0)
463	return i;
464
465	if (*str) {
466	/* there is /xxx after dotted-IP address */
467	i = bb_strtou(str, &p, 10);
468	if (*p == '.') {
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;
472	}
473	if (*p)
474	return -1;
475	}
476
477	if (i > 32)
478	return -1;
479
480	if (sizeof(unsigned) == 4 && i == 32) {
481	/* mask >>= 32 below may not work */
482	mask = 0;
483	} else {
484	mask = 0xffffffff;
485	mask >>= i;
486	}
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);
493	return 0;
494	}
495
496	/*
497	* Parse configuration file into in-memory linked list.
498	*
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
502	* SUBDIR_PARSE.
503	* Error pages are only parsed on the main config file.
504	*
505	* path Path where to look for httpd.conf (without filename).
506	* flag Type of the parse request.
507	*/
508	/* flag param: */
509	enum {
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 */
513	};
514	static void parse_conf(const char *path, int flag)
515	{
516	/* internally used extra flag state */
517	enum { TRY_CURDIR_PARSE = 3 };
518
519	FILE *f;
520	const char *filename;
521	char buf[160];
522
523	/* discard old rules */
524	free_Htaccess_IP_list(&ip_a_d);
525	flg_deny_all = 0;
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);
531	#endif
532	#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
533	free_Htaccess_list(&script_i);
534	#endif
535	}
536
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);
541	}
542
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 */
546	return;
547	}
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: */
554	}
555	flag = TRY_CURDIR_PARSE;
556	filename = HTTPD_CONF;
557	}
558
559	#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
560	/* in "/file:user:pass" lines, we prepend path in subdirs */
561	if (flag != SUBDIR_PARSE)
562	path = "";
563	#endif
564	/* The lines can be:
565	*
566	* I:default_index_file
567	* H:http_home
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
574	*/
575	while (fgets(buf, sizeof(buf), f) != NULL) {
576	unsigned strlen_buf;
577	unsigned char ch;
578	char *after_colon;
579
580	{ /* remove all whitespace, and # comments */
581	char *p, *p0;
582
583	p0 = buf;
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'
590	) {
591	p0++;
592	}
593	p = p0;
594	/* if we enter this loop, we have some whitespace.
595	* discard it */
596	while (ch != '\0' && ch != '\n' && ch != '#') {
597	if (ch != ' ' && ch != '\t') {
598	*p++ = ch;
599	}
600	ch = *++p0;
601	}
602	*p = '\0';
603	strlen_buf = p - buf;
604	if (strlen_buf == 0)
605	continue; /* empty line */
606	}
607
608	after_colon = strchr(buf, ':');
609	/* strange line? */
610	if (after_colon == NULL || *++after_colon == '\0')
611	goto config_error;
612
613	ch = (buf[0] & ~0x20); /* toupper if it's a letter */
614
615	if (ch == 'I') {
616	if (index_page != index_html)
617	free((char*)index_page);
618	index_page = xstrdup(after_colon);
619	continue;
620	}
621
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);
625	xchdir(home_httpd);
626	continue;
627	}
628
629	if (ch == 'A' || ch == 'D') {
630	Htaccess_IP *pip;
631
632	if (*after_colon == '*') {
633	if (ch == 'D') {
634	/* memorize "deny all" */
635	flg_deny_all = 1;
636	}
637	/* skip assumed "A:*", it is a default anyway */
638	continue;
639	}
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 */
644	ch = 'D';
645	pip->mask = 0;
646	}
647	pip->allow_deny = ch;
648	if (ch == 'D') {
649	/* Deny:from_IP - prepend */
650	pip->next = ip_a_d;
651	ip_a_d = pip;
652	} else {
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) {
656	ip_a_d = pip;
657	} else {
658	while (prev_IP->next)
659	prev_IP = prev_IP->next;
660	prev_IP->next = pip;
661	}
662	}
663	continue;
664	}
665
666	#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
667	if (flag == FIRST_PARSE && ch == 'E') {
668	unsigned i;
669	int status = atoi(buf + 1); /* error status code */
670
671	if (status < HTTP_CONTINUE) {
672	goto config_error;
673	}
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)
679	* here */
680	http_error_page[i] = xstrdup(after_colon);
681	break;
682	}
683	}
684	continue;
685	}
686	#endif
687
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;
693
694	url_from = after_colon;
695	host_port = strchr(after_colon, ':');
696	if (host_port == NULL) {
697	goto config_error;
698	}
699	*host_port++ = '\0';
700	if (strncmp(host_port, "http://", 7) == 0)
701	host_port += 7;
702	if (*host_port == '\0') {
703	goto config_error;
704	}
705	url_to = strchr(host_port, '/');
706	if (url_to == NULL) {
707	goto config_error;
708	}
709	*url_to = '\0';
710	proxy_entry = xzalloc(sizeof(*proxy_entry));
711	proxy_entry->url_from = xstrdup(url_from);
712	proxy_entry->host_port = xstrdup(host_port);
713	*url_to = '/';
714	proxy_entry->url_to = xstrdup(url_to);
715	proxy_entry->next = proxy;
716	proxy = proxy_entry;
717	continue;
718	}
719	#endif
720	/* the rest of directives are non-alphabetic,
721	* must avoid using "toupper'ed" ch */
722	ch = buf[0];
723
724	if (ch == '.' /* ".ext:mime/type" */
725	#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
726	|| (ch == '*' && buf[1] == '.') /* "*.php:/path/php" */
727	#endif
728	) {
729	char *p;
730	Htaccess *cur;
731
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);
735	p[-1] = '\0';
736	cur->after_colon = p;
737	if (ch == '.') {
738	/* .mime line: prepend to mime_a list */
739	cur->next = mime_a;
740	mime_a = cur;
741	}
742	#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
743	else {
744	/* script interpreter line: prepend to script_i list */
745	cur->next = script_i;
746	script_i = cur;
747	}
748	#endif
749	continue;
750	}
751
752	#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
753	if (ch == '/') { /* "/file:user:pass" */
754	char *p;
755	Htaccess *cur;
756	unsigned file_len;
757
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 */
761	+ 1 + strlen(path)
762	+ strlen_buf
763	);
764	/* form "/path/file" */
765	sprintf(cur->before_colon, "/%s%.*s",
766	path,
767	(int) (after_colon - buf - 1), /* includes "/", but not ":" */
768	buf);
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;
775
776	/* insert cur into g_auth */
777	/* g_auth is sorted by decreased filename length */
778	{
779	Htaccess *auth, **authp;
780
781	authp = &g_auth;
782	while ((auth = *authp) != NULL) {
783	if (file_len >= strlen(auth->before_colon)) {
784	/* insert cur before auth */
785	cur->next = auth;
786	break;
787	}
788	authp = &auth->next;
789	}
790	*authp = cur;
791	}
792	continue;
793	}
794	#endif /* BASIC_AUTH */
795
796	/* the line is not recognized */
797	config_error:
798	bb_error_msg("config error '%s' in '%s'", buf, filename);
799	} /* while (fgets) */
800
801	fclose(f);
802	}
803
804	#if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
805	/*
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().
810	*
811	* Returns a pointer to the encoded string (malloced).
812	*/
813	static char *encodeString(const char *string)
814	{
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);
819	char *p = out;
820	char ch;
821
822	while ((ch = *string++) != '\0') {
823	/* very simple check for what to encode */
824	if (isalnum(ch))
825	*p++ = ch;
826	else
827	p += sprintf(p, "&#%d;", (unsigned char) ch);
828	}
829	*p = '\0';
830	return out;
831	}
832	#endif
833
834	#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
835	/*
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.
842	*/
843	static void decodeBase64(char *Data)
844	{
845	const unsigned char *in = (const unsigned char *)Data;
846	/* The decoded size will be at most 3/4 the size of the encoded */
847	unsigned ch = 0;
848	int i = 0;
849
850	while (*in) {
851	int t = *in++;
852
853	if (t >= '0' && t <= '9')
854	t = t - '0' + 52;
855	else if (t >= 'A' && t <= 'Z')
856	t = t - 'A';
857	else if (t >= 'a' && t <= 'z')
858	t = t - 'a' + 26;
859	else if (t == '+')
860	t = 62;
861	else if (t == '/')
862	t = 63;
863	else if (t == '=')
864	t = 0;
865	else
866	continue;
867
868	ch = (ch << 6) | t;
869	i++;
870	if (i == 4) {
871	*Data++ = (char) (ch >> 16);
872	*Data++ = (char) (ch >> 8);
873	*Data++ = (char) ch;
874	i = 0;
875	}
876	}
877	*Data = '\0';
878	}
879	#endif
880
881	/*
882	* Create a listen server socket on the designated port.
883	*/
884	static int openServer(void)
885	{
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);
889	else
890	n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
891	xlisten(n, 9);
892	return n;
893	}
894
895	/*
896	* Log the connection closure and exit.
897	*/
898	static void log_and_exit(void) NORETURN;
899	static void log_and_exit(void)
900	{
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);
904	/* Why??
905	(this also messes up stdin when user runs httpd -i from terminal)
906	ndelay_on(0);
907	while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0)
908	continue;
909	*/
910
911	if (verbose > 2)
912	bb_error_msg("closed");
913	_exit(xfunc_error_retval);
914	}
915
916	/*
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.
922	*/
923	static void send_headers(int responseNum)
924	{
925	static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
926
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;
932	#endif
933	unsigned i;
934	time_t timer = time(NULL);
935	char tmp_str[80];
936	int len;
937
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];
944	#endif
945	break;
946	}
947	}
948	/* error message is HTML */
949	mime_type = responseNum == HTTP_OK ?
950	found_mime_type : "text/html";
951
952	if (verbose)
953	bb_error_msg("response:%u", responseNum);
954
955	/* emit the current date */
956	strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
957	len = sprintf(iobuf,
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);
961
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",
966	g_realm);
967	}
968	#endif
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 : ""));
974	}
975
976	#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
977	if (error_page && access(error_page, R_OK) == 0) {
978	strcat(iobuf, "\r\n");
979	len += 2;
980
981	if (DEBUG)
982	fprintf(stderr, "headers: '%s'\n", iobuf);
983	full_write(STDOUT_FILENO, iobuf, len);
984	if (DEBUG)
985	fprintf(stderr, "writing error page: '%s'\n", error_page);
986	return send_file_and_exit(error_page, SEND_BODY);
987	}
988	#endif
989
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",
995	range_start,
996	range_end,
997	file_size);
998	file_size = range_end - range_start + 1;
999	}
1000	#endif
1001	len += sprintf(iobuf + len,
1002	#if ENABLE_FEATURE_HTTPD_RANGES
1003	"Accept-Ranges: bytes\r\n"
1004	#endif
1005	"Last-Modified: %s\r\n%s %"OFF_FMT"u\r\n",
1006	tmp_str,
1007	content_gzip ? "Transfer-length:" : "Content-length:",
1008	file_size
1009	);
1010	}
1011
1012	if (content_gzip)
1013	len += sprintf(iobuf + len, "Content-Encoding: gzip\r\n");
1014
1015	iobuf[len++] = '\r';
1016	iobuf[len++] = '\n';
1017	if (infoString) {
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);
1023	}
1024	if (DEBUG)
1025	fprintf(stderr, "headers: '%s'\n", iobuf);
1026	if (full_write(STDOUT_FILENO, iobuf, len) != len) {
1027	if (verbose > 1)
1028	bb_perror_msg("error");
1029	log_and_exit();
1030	}
1031	}
1032
1033	static void send_headers_and_exit(int responseNum) NORETURN;
1034	static void send_headers_and_exit(int responseNum)
1035	{
1036	IF_FEATURE_HTTPD_GZIP(content_gzip = 0;)
1037	send_headers(responseNum);
1038	log_and_exit();
1039	}
1040
1041	/*
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.
1047	*/
1048	static int get_line(void)
1049	{
1050	int count = 0;
1051	char c;
1052
1053	alarm(HEADER_READ_TIMEOUT);
1054	while (1) {
1055	if (hdr_cnt <= 0) {
1056	hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1057	if (hdr_cnt <= 0)
1058	break;
1059	hdr_ptr = hdr_buf;
1060	}
1061	iobuf[count] = c = *hdr_ptr++;
1062	hdr_cnt--;
1063
1064	if (c == '\r')
1065	continue;
1066	if (c == '\n') {
1067	iobuf[count] = '\0';
1068	break;
1069	}
1070	if (count < (IOBUF_SIZE - 1)) /* check overflow */
1071	count++;
1072	}
1073	return count;
1074	}
1075
1076	#if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1077
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)
1081	{
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 */
1085	int count;
1086
1087	/* iobuf is used for CGI -> network data,
1088	* hdr_buf is for network -> CGI data (POSTDATA) */
1089
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);
1093
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.
1097
1098	//if (hdr_cnt > post_len) {
1099	// /* We got more POSTDATA from network than we expected */
1100	// hdr_cnt = post_len;
1101	//}
1102	post_len -= hdr_cnt;
1103	/* post_len - number of POST bytes not yet read from network */
1104
1105	/* NB: breaking out of this loop jumps to log_and_exit() */
1106	out_cnt = 0;
1107	pfd[FROM_CGI].fd = fromCgi_rd;
1108	pfd[FROM_CGI].events = POLLIN;
1109	pfd[TO_CGI].fd = toCgi_wr;
1110	while (1) {
1111	/* Note: even pfd[0].events == 0 won't prevent
1112	* revents == POLLHUP|POLLERR reports from closed stdin.
1113	* Setting fd to -1 works: */
1114	pfd[0].fd = -1;
1115	pfd[0].events = POLLIN;
1116	pfd[0].revents = 0; /* probably not needed, paranoia */
1117
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 */
1121
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! */
1127
1128	if (toCgi_wr && hdr_cnt <= 0) {
1129	if (post_len > 0) {
1130	/* Expect more POST data from network */
1131	pfd[0].fd = 0;
1132	} else {
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)
1137	close(toCgi_wr);
1138	toCgi_wr = 0;
1139	}
1140	}
1141
1142	/* Now wait on the set of sockets */
1143	count = safe_poll(pfd, hdr_cnt > 0 ? TO_CGI+1 : FROM_CGI+1, -1);
1144	if (count <= 0) {
1145	#if 0
1146	if (safe_waitpid(pid, &status, WNOHANG) <= 0) {
1147	/* Weird. CGI didn't exit and no fd's
1148	* are ready, yet poll returned?! */
1149	continue;
1150	}
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));
1155	#endif
1156	break;
1157	}
1158
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) {
1165	* ...
1166	*} else */
1167	if (count > 0) {
1168	hdr_ptr += count;
1169	hdr_cnt -= count;
1170	} else {
1171	/* EOF/broken pipe to CGI, stop piping POST data */
1172	hdr_cnt = post_len = 0;
1173	}
1174	}
1175
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
1180	* (POSTDATA) */
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));
1184	if (count > 0) {
1185	hdr_cnt = count;
1186	hdr_ptr = hdr_buf;
1187	post_len -= count;
1188	} else {
1189	/* no more POST data can be read */
1190	post_len = 0;
1191	}
1192	}
1193
1194	if (pfd[FROM_CGI].revents) {
1195	/* There is something to read from CGI */
1196	char *rbuf = iobuf;
1197
1198	/* Are we still buffering CGI output? */
1199	if (out_cnt >= 0) {
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 */
1207
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);
1213	if (count <= 0) {
1214	/* eof (or error) and there was no "HTTP",
1215	* so write it, then write received data */
1216	if (out_cnt) {
1217	full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1);
1218	full_write(STDOUT_FILENO, rbuf, out_cnt);
1219	}
1220	break; /* CGI stdout is closed, exiting */
1221	}
1222	out_cnt += count;
1223	count = 0;
1224	/* "Status" header format is: "Status: 302 Redirected\r\n" */
1225	if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1226	/* send "HTTP/1.0 " */
1227	if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9)
1228	break;
1229	rbuf += 8; /* skip "Status: " */
1230	count = out_cnt - 8;
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)
1237	break;
1238	}
1239	/* Commented out:
1240	if (!strstr(rbuf, "ontent-")) {
1241	full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1242	}
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"
1246	* echo -en "\r\n"
1247	*/
1248	count = out_cnt;
1249	out_cnt = -1; /* buffering off */
1250	}
1251	} else {
1252	count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1253	if (count <= 0)
1254	break; /* eof (or error) */
1255	}
1256	if (full_write(STDOUT_FILENO, rbuf, count) != count)
1257	break;
1258	if (DEBUG)
1259	fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1260	} /* if (pfd[FROM_CGI].revents) */
1261	} /* while (1) */
1262	log_and_exit();
1263	}
1264	#endif
1265
1266	#if ENABLE_FEATURE_HTTPD_CGI
1267
1268	static void setenv1(const char *name, const char *value)
1269	{
1270	setenv(name, value ? value : "", 1);
1271	}
1272
1273	/*
1274	* Spawn CGI script, forward CGI's stdin/out <=> network
1275	*
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).
1279	*
1280	* Parameters:
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.
1286	*/
1287	static void send_cgi_and_exit(
1288	const char *url,
1289	const char *orig_uri,
1290	const char *request,
1291	int post_len,
1292	const char *cookie,
1293	const char *content_type) NORETURN;
1294	static void send_cgi_and_exit(
1295	const char *url,
1296	const char *orig_uri,
1297	const char *request,
1298	int post_len,
1299	const char *cookie,
1300	const char *content_type)
1301	{
1302	struct fd_pair fromCgi; /* CGI -> httpd pipe */
1303	struct fd_pair toCgi; /* httpd -> CGI pipe */
1304	char *script, *last_slash;
1305	int pid;
1306
1307	/* Make a copy. NB: caller guarantees:
1308	* url[0] == '/', url[1] != '/' */
1309	url = xstrdup(url);
1310
1311	/*
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.
1315	*/
1316
1317	/* Check for [dirs/]script.cgi/PATH_INFO */
1318	last_slash = script = (char*)url;
1319	while ((script = strchr(script + 1, '/')) != NULL) {
1320	int dir;
1321	*script = '\0';
1322	dir = is_directory(url + 1, /*followlinks:*/ 1);
1323	*script = '/';
1324	if (!dir) {
1325	/* not directory, found script.cgi/PATH_INFO */
1326	break;
1327	}
1328	/* is directory, find next '/' */
1329	last_slash = script;
1330	}
1331	setenv1("PATH_INFO", script); /* set to /PATH_INFO or "" */
1332	setenv1("REQUEST_METHOD", request);
1333	if (g_query) {
1334	putenv(xasprintf("%s=%s?%s", "REQUEST_URI", orig_uri, g_query));
1335	} else {
1336	setenv1("REQUEST_URI", orig_uri);
1337	}
1338	if (script != NULL)
1339	*script = '\0'; /* cut off /PATH_INFO */
1340
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);
1345	}
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.
1363	* Oh well... */
1364	{
1365	char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1366	char *cp = strrchr(p, ':');
1367	if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1368	cp = NULL;
1369	if (cp) *cp = '\0'; /* delete :PORT */
1370	setenv1("REMOTE_ADDR", p);
1371	if (cp) {
1372	*cp = ':';
1373	#if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1374	setenv1("REMOTE_PORT", cp + 1);
1375	#endif
1376	}
1377	}
1378	setenv1("HTTP_USER_AGENT", user_agent);
1379	if (http_accept)
1380	setenv1("HTTP_ACCEPT", http_accept);
1381	if (http_accept_language)
1382	setenv1("HTTP_ACCEPT_LANGUAGE", http_accept_language);
1383	if (post_len)
1384	putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1385	if (cookie)
1386	setenv1("HTTP_COOKIE", cookie);
1387	if (content_type)
1388	setenv1("CONTENT_TYPE", content_type);
1389	#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1390	if (remoteuser) {
1391	setenv1("REMOTE_USER", remoteuser);
1392	putenv((char*)"AUTH_TYPE=Basic");
1393	}
1394	#endif
1395	if (referer)
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 */
1400
1401	xpiped_pair(fromCgi);
1402	xpiped_pair(toCgi);
1403
1404	pid = vfork();
1405	if (pid < 0) {
1406	/* TODO: log perror? */
1407	log_and_exit();
1408	}
1409
1410	if (pid == 0) {
1411	/* Child process */
1412	char *argv[3];
1413
1414	xfunc_error_retval = 242;
1415
1416	/* NB: close _first_, then move fds! */
1417	close(toCgi.wr);
1418	close(fromCgi.rd);
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. */
1423	/* dup2(1, 2); */
1424
1425	/* Chdiring to script's dir */
1426	script = last_slash;
1427	if (script != url) { /* paranoia */
1428	*script = '\0';
1429	if (chdir(url + 1) != 0) {
1430	bb_perror_msg("can't change directory to '%s'", url + 1);
1431	goto error_execing_cgi;
1432	}
1433	// not needed: *script = '/';
1434	}
1435	script++;
1436
1437	/* set argv[0] to name without path */
1438	argv[0] = script;
1439	argv[1] = NULL;
1440
1441	#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1442	{
1443	char *suffix = strrchr(script, '.');
1444
1445	if (suffix) {
1446	Htaccess *cur;
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;
1451	argv[1] = script;
1452	argv[2] = NULL;
1453	break;
1454	}
1455	}
1456	}
1457	}
1458	#endif
1459	/* restore default signal dispositions for CGI process */
1460	bb_signals(0
1461	| (1 << SIGCHLD)
1462	| (1 << SIGPIPE)
1463	| (1 << SIGHUP)
1464	, SIG_DFL);
1465
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);
1470	if (verbose)
1471	bb_perror_msg("can't execute '%s'", argv[0]);
1472	error_execing_cgi:
1473	/* send to stdout
1474	* (we are CGI here, our stdout is pumped to the net) */
1475	send_headers_and_exit(HTTP_NOT_FOUND);
1476	} /* end child */
1477
1478	/* Parent process */
1479
1480	/* Restore variables possibly changed by child */
1481	xfunc_error_retval = 0;
1482
1483	/* Pump data */
1484	close(fromCgi.wr);
1485	close(toCgi.rd);
1486	cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1487	}
1488
1489	#endif /* FEATURE_HTTPD_CGI */
1490
1491	/*
1492	* Send a file response to a HTTP request, and exit
1493	*
1494	* Parameters:
1495	* const char *url The requested URL (with leading /).
1496	* what What to send (headers/body/both).
1497	*/
1498	static NOINLINE void send_file_and_exit(const char *url, int what)
1499	{
1500	char *suffix;
1501	int fd;
1502	ssize_t count;
1503
1504	if (content_gzip) {
1505	/* does <url>.gz exist? Then use it instead */
1506	char *gzurl = xasprintf("%s.gz", url);
1507	fd = open(gzurl, O_RDONLY);
1508	free(gzurl);
1509	if (fd != -1) {
1510	struct stat sb;
1511	fstat(fd, &sb);
1512	file_size = sb.st_size;
1513	last_mod = sb.st_mtime;
1514	} else {
1515	IF_FEATURE_HTTPD_GZIP(content_gzip = 0;)
1516	fd = open(url, O_RDONLY);
1517	}
1518	} else {
1519	fd = open(url, O_RDONLY);
1520	}
1521	if (fd < 0) {
1522	if (DEBUG)
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);
1529	log_and_exit();
1530	}
1531	/* If you want to know about EPIPE below
1532	* (happens if you abort downloads from local httpd): */
1533	signal(SIGPIPE, SIG_IGN);
1534
1535	/* If not found, default is "application/octet-stream" */
1536	found_mime_type = "application/octet-stream";
1537	suffix = strrchr(url, '.');
1538	if (suffix) {
1539	static const char suffixTable[] ALIGN1 =
1540	/* Shorter suffix must be first:
1541	* ".html.htm" will fail for ".htm"
1542	*/
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"
1561	#endif
1562	/* compiler adds another "\0" here */
1563	;
1564	Htaccess *cur;
1565
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);
1575	if (!try_suffix)
1576	continue;
1577	try_suffix += strlen(suffix);
1578	if (*try_suffix == '\0' || *try_suffix == '.') {
1579	found_mime_type = mime_type;
1580	break;
1581	}
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: */
1587	break;
1588	}
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;
1593	break;
1594	}
1595	}
1596	}
1597
1598	if (DEBUG)
1599	bb_error_msg("sending file '%s' content-type: %s",
1600	url, found_mime_type);
1601
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?
1605	) {
1606	range_start = -1;
1607	}
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;
1612	}
1613	if (range_end < range_start
1614	|| lseek(fd, range_start, SEEK_SET) != range_start
1615	) {
1616	lseek(fd, 0, SEEK_SET);
1617	range_start = -1;
1618	} else {
1619	range_len = range_end - range_start + 1;
1620	send_headers(HTTP_PARTIAL_CONTENT);
1621	what = SEND_BODY;
1622	}
1623	}
1624	#endif
1625	if (what & SEND_HEADERS)
1626	send_headers(HTTP_OK);
1627	#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1628	{
1629	off_t offset = range_start;
1630	while (1) {
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);
1635	if (count < 0) {
1636	if (offset == range_start)
1637	break; /* fall back to read/write loop */
1638	goto fin;
1639	}
1640	IF_FEATURE_HTTPD_RANGES(range_len -= count;)
1641	if (count == 0 || range_len == 0)
1642	log_and_exit();
1643	}
1644	}
1645	#endif
1646	while ((count = safe_read(fd, iobuf, IOBUF_SIZE)) > 0) {
1647	ssize_t n;
1648	IF_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1649	n = full_write(STDOUT_FILENO, iobuf, count);
1650	if (count != n)
1651	break;
1652	IF_FEATURE_HTTPD_RANGES(range_len -= count;)
1653	if (range_len == 0)
1654	break;
1655	}
1656	if (count < 0) {
1657	IF_FEATURE_HTTPD_USE_SENDFILE(fin:)
1658	if (verbose > 1)
1659	bb_perror_msg("error");
1660	}
1661	log_and_exit();
1662	}
1663
1664	static int checkPermIP(void)
1665	{
1666	Htaccess_IP *cur;
1667
1668	for (cur = ip_a_d; cur; cur = cur->next) {
1669	#if DEBUG
1670	fprintf(stderr,
1671	"checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1672	rmt_ip_str,
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)
1681	);
1682	#endif
1683	if ((rmt_ip & cur->mask) == cur->ip)
1684	return (cur->allow_deny == 'A'); /* A -> 1 */
1685	}
1686
1687	return !flg_deny_all; /* depends on whether we saw "D:*" */
1688	}
1689
1690	#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1691
1692	# if ENABLE_PAM
1693	struct pam_userinfo {
1694	const char *name;
1695	const char *pw;
1696	};
1697
1698	static int pam_talker(int num_msg,
1699	const struct pam_message **msg,
1700	struct pam_response **resp,
1701	void *appdata_ptr)
1702	{
1703	int i;
1704	struct pam_userinfo *userinfo = (struct pam_userinfo *) appdata_ptr;
1705	struct pam_response *response;
1706
1707	if (!resp || !msg || !userinfo)
1708	return PAM_CONV_ERR;
1709
1710	/* allocate memory to store response */
1711	response = xzalloc(num_msg * sizeof(*response));
1712
1713	/* copy values */
1714	for (i = 0; i < num_msg; i++) {
1715	const char *s;
1716
1717	switch (msg[i]->msg_style) {
1718	case PAM_PROMPT_ECHO_ON:
1719	s = userinfo->name;
1720	break;
1721	case PAM_PROMPT_ECHO_OFF:
1722	s = userinfo->pw;
1723	break;
1724	case PAM_ERROR_MSG:
1725	case PAM_TEXT_INFO:
1726	s = "";
1727	break;
1728	default:
1729	free(response);
1730	return PAM_CONV_ERR;
1731	}
1732	response[i].resp = xstrdup(s);
1733	if (PAM_SUCCESS != 0)
1734	response[i].resp_retcode = PAM_SUCCESS;
1735	}
1736	*resp = response;
1737	return PAM_SUCCESS;
1738	}
1739	# endif
1740
1741	/*
1742	* Config file entries are of the form "/<path>:<user>:<passwd>".
1743	* If config file has no prefix match for path, access is allowed.
1744	*
1745	* path The file path
1746	* user_and_passwd "user:passwd" to validate
1747	*
1748	* Returns 1 if user_and_passwd is OK.
1749	*/
1750	static int check_user_passwd(const char *path, char *user_and_passwd)
1751	{
1752	Htaccess *cur;
1753	const char *prev = NULL;
1754
1755	for (cur = g_auth; cur; cur = cur->next) {
1756	const char *dir_prefix;
1757	size_t len;
1758	int r;
1759
1760	dir_prefix = cur->before_colon;
1761
1762	/* WHY? */
1763	/* If already saw a match, don't accept other different matches */
1764	if (prev && strcmp(prev, dir_prefix) != 0)
1765	continue;
1766
1767	if (DEBUG)
1768	fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd);
1769
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')
1775	)
1776	) {
1777	continue;
1778	}
1779
1780	/* Path match found */
1781	prev = dir_prefix;
1782
1783	if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1784	char *colon_after_user;
1785	const char *passwd;
1786	# if ENABLE_FEATURE_SHADOWPASSWDS && !ENABLE_PAM
1787	char sp_buf[256];
1788	# endif
1789
1790	colon_after_user = strchr(user_and_passwd, ':');
1791	if (!colon_after_user)
1792	goto bad_input;
1793
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
1798	) {
1799	continue;
1800	}
1801	/* this cfg entry is '*' or matches username from peer */
1802
1803	passwd = strchr(cur->after_colon, ':');
1804	if (!passwd)
1805	goto bad_input;
1806	passwd++;
1807	if (passwd[0] == '*') {
1808	# if ENABLE_PAM
1809	struct pam_userinfo userinfo;
1810	struct pam_conv conv_info = { &pam_talker, (void *) &userinfo };
1811	pam_handle_t *pamh;
1812
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;
1817	if (r == 0) {
1818	r = pam_authenticate(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS
1819	|| pam_acct_mgmt(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS
1820	;
1821	pam_end(pamh, PAM_SUCCESS);
1822	}
1823	*colon_after_user = ':';
1824	goto end_check_passwd;
1825	# else
1826	# if ENABLE_FEATURE_SHADOWPASSWDS
1827	/* Using _r function to avoid pulling in static buffers */
1828	struct spwd spw;
1829	# endif
1830	struct passwd *pw;
1831
1832	*colon_after_user = '\0';
1833	pw = getpwnam(user_and_passwd);
1834	*colon_after_user = ':';
1835	if (!pw || !pw->pw_passwd)
1836	continue;
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;
1846	}
1847	# endif
1848	/* In this case, passwd is ALWAYS encrypted:
1849	* it came from /etc/passwd or /etc/shadow!
1850	*/
1851	goto check_encrypted;
1852	# endif /* ENABLE_PAM */
1853	}
1854	/* Else: passwd is from httpd.conf, it is either plaintext or encrypted */
1855
1856	if (passwd[0] == '$' && isdigit(passwd[1])) {
1857	char *encrypted;
1858	# if !ENABLE_PAM
1859	check_encrypted:
1860	# endif
1861	/* encrypt pwd from peer and check match with local one */
1862	encrypted = pw_encrypt(
1863	/* pwd (from peer): */ colon_after_user + 1,
1864	/* salt: */ passwd,
1865	/* cleanup: */ 0
1866	);
1867	r = strcmp(encrypted, passwd);
1868	free(encrypted);
1869	} else {
1870	/* local passwd is from httpd.conf and it's plaintext */
1871	r = strcmp(colon_after_user + 1, passwd);
1872	}
1873	goto end_check_passwd;
1874	}
1875	bad_input:
1876	/* Comparing plaintext "user:pass" in one go */
1877	r = strcmp(cur->after_colon, user_and_passwd);
1878	end_check_passwd:
1879	if (r == 0) {
1880	remoteuser = xstrndup(user_and_passwd,
1881	strchrnul(user_and_passwd, ':') - user_and_passwd
1882	);
1883	return 1; /* Ok */
1884	}
1885	} /* for */
1886
1887	/* 0(bad) if prev is set: matches were found but passwd was wrong */
1888	return (prev == NULL);
1889	}
1890	#endif /* FEATURE_HTTPD_BASIC_AUTH */
1891
1892	#if ENABLE_FEATURE_HTTPD_PROXY
1893	static Htaccess_Proxy *find_proxy_entry(const char *url)
1894	{
1895	Htaccess_Proxy *p;
1896	for (p = proxy; p; p = p->next) {
1897	if (strncmp(url, p->url_from, strlen(p->url_from)) == 0)
1898	return p;
1899	}
1900	return NULL;
1901	}
1902	#endif
1903
1904	/*
1905	* Handle timeouts
1906	*/
1907	static void send_REQUEST_TIMEOUT_and_exit(int sig) NORETURN;
1908	static void send_REQUEST_TIMEOUT_and_exit(int sig UNUSED_PARAM)
1909	{
1910	send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1911	}
1912
1913	/*
1914	* Handle an incoming http request and exit.
1915	*/
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)
1918	{
1919	static const char request_GET[] ALIGN1 = "GET";
1920	struct stat sb;
1921	char *urlcopy;
1922	char *urlp;
1923	char *tptr;
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;
1933	#endif
1934	#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1935	smallint authorized = -1;
1936	#endif
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;
1944	#endif
1945
1946	/* Allocation of iobuf is postponed until now
1947	* (IOW, server process doesn't need to waste 8k) */
1948	iobuf = xmalloc(IOBUF_SIZE);
1949
1950	rmt_ip = 0;
1951	if (fromAddr->u.sa.sa_family == AF_INET) {
1952	rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr);
1953	}
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]);
1960	#endif
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);
1964	}
1965	if (verbose) {
1966	/* this trick makes -v logging much simpler */
1967	if (rmt_ip_str)
1968	applet_name = rmt_ip_str;
1969	if (verbose > 2)
1970	bb_error_msg("connected");
1971	}
1972
1973	/* Install timeout handler. get_line() needs it. */
1974	signal(SIGALRM, send_REQUEST_TIMEOUT_and_exit);
1975
1976	if (!get_line()) /* EOF or error or empty line */
1977	send_headers_and_exit(HTTP_BAD_REQUEST);
1978
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, ' ');
1983	if (urlp == NULL)
1984	send_headers_and_exit(HTTP_BAD_REQUEST);
1985	*urlp++ = '\0';
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) {
1991	prequest = "POST";
1992	if (strcasecmp(iobuf, prequest) != 0)
1993	send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1994	}
1995	}
1996	#else
1997	if (strcasecmp(iobuf, request_GET) != 0)
1998	send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1999	#endif
2000	// rfc2616: method and URI is separated by exactly one space
2001	//urlp = skip_whitespace(urlp); - should not be necessary
2002	if (urlp[0] != '/')
2003	send_headers_and_exit(HTTP_BAD_REQUEST);
2004
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];)
2013	}
2014	*tptr = '\0';
2015
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 */
2022
2023	/* Extract url args if present */
2024	/* g_query = NULL; - already is */
2025	tptr = strchr(urlcopy, '?');
2026	if (tptr) {
2027	*tptr++ = '\0';
2028	g_query = tptr;
2029	}
2030
2031	/* Decode URL escape sequences */
2032	tptr = percent_decode_in_place(urlcopy, /*strict:*/ 1);
2033	if (tptr == NULL)
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);
2038	}
2039
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;
2044	for (;;) {
2045	if (*urlp == '/') {
2046	/* skip duplicate (or initial) slash */
2047	if (*tptr == '/') {
2048	goto next_char;
2049	}
2050	if (*tptr == '.') {
2051	if (tptr[1] == '.' && (tptr[2] == '/' || tptr[2] == '\0')) {
2052	/* "..": be careful */
2053	/* protect root */
2054	if (urlp == urlcopy)
2055	send_headers_and_exit(HTTP_BAD_REQUEST);
2056	/* omit previous dir */
2057	while (*--urlp != '/')
2058	continue;
2059	/* skip to "./" or ".<NUL>" */
2060	tptr++;
2061	}
2062	if (tptr[1] == '/' || tptr[1] == '\0') {
2063	/* skip extra "/./" */
2064	goto next_char;
2065	}
2066	}
2067	}
2068	*++urlp = *tptr;
2069	if (*urlp == '\0')
2070	break;
2071	next_char:
2072	tptr++;
2073	}
2074
2075	/* If URL is a directory, add '/' */
2076	if (urlp[-1] != '/') {
2077	if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) {
2078	found_moved_temporarily = urlcopy;
2079	}
2080	}
2081
2082	/* Log it */
2083	if (verbose > 1)
2084	bb_error_msg("url:%s", urlcopy);
2085
2086	tptr = urlcopy;
2087	ip_allowed = checkPermIP();
2088	while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
2089	/* have path1/path2 */
2090	*tptr = '\0';
2091	if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) {
2092	/* may have subdir config */
2093	parse_conf(urlcopy + 1, SUBDIR_PARSE);
2094	ip_allowed = checkPermIP();
2095	}
2096	*tptr = '/';
2097	}
2098
2099	#if ENABLE_FEATURE_HTTPD_PROXY
2100	proxy_entry = find_proxy_entry(urlcopy);
2101	if (proxy_entry)
2102	header_buf = header_ptr = xmalloc(IOBUF_SIZE);
2103	#endif
2104
2105	if (http_major_version >= '0') {
2106	/* Request was with "... HTTP/nXXX", and n >= 0 */
2107
2108	/* Read until blank line */
2109	while (1) {
2110	if (!get_line())
2111	break; /* EOF or error or empty line */
2112	if (DEBUG)
2113	bb_error_msg("header: '%s'", iobuf);
2114
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);
2123	header_ptr += len;
2124	header_ptr[0] = '\r';
2125	header_ptr[1] = '\n';
2126	header_ptr += 2;
2127	}
2128	#endif
2129
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
2137	# endif
2138	) {
2139	tptr = skip_whitespace(iobuf + sizeof("Content-length:") - 1);
2140	if (!tptr[0])
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);
2147	}
2148	}
2149	#endif
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));
2165	}
2166	#endif
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.
2172	*/
2173	tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
2174	if (STRNCASECMP(tptr, "Basic") != 0)
2175	continue;
2176	tptr += sizeof("Basic")-1;
2177	/* decodeBase64() skips whitespace itself */
2178	decodeBase64(tptr);
2179	authorized = check_user_passwd(urlcopy, tptr);
2180	}
2181	#endif
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 (strncmp(s, "bytes=", 6) == 0) {
2187	s += sizeof("bytes=")-1;
2188	range_start = BB_STRTOOFF(s, &s, 10);
2189	if (s[0] != '-' || range_start < 0) {
2190	range_start = -1;
2191	} else if (s[1]) {
2192	range_end = BB_STRTOOFF(s+1, NULL, 10);
2193	if (errno || range_end < range_start)
2194	range_start = -1;
2195	}
2196	}
2197	}
2198	#endif
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");
2205	if (s) {
2206	// want more thorough checks?
2207	//if (s[-1] == ' '
2208	// || s[-1] == ','
2209	// || s[-1] == ':'
2210	//) {
2211	content_gzip = 1;
2212	//}
2213	}
2214	}
2215	#endif
2216	} /* while extra header reading */
2217	}
2218
2219	/* We are done reading headers, disable peer timeout */
2220	alarm(0);
2221
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);
2225	}
2226
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 */
2230	if (authorized < 0)
2231	authorized = check_user_passwd(urlcopy, (char *) "");
2232	if (!authorized)
2233	send_headers_and_exit(HTTP_UNAUTHORIZED);
2234	#endif
2235
2236	if (found_moved_temporarily) {
2237	send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
2238	}
2239
2240	#if ENABLE_FEATURE_HTTPD_PROXY
2241	if (proxy_entry != NULL) {
2242	int proxy_fd;
2243	len_and_sockaddr *lsa;
2244
2245	proxy_fd = socket(AF_INET, SOCK_STREAM, 0);
2246	if (proxy_fd < 0)
2247	send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2248	lsa = host2sockaddr(proxy_entry->host_port, 80);
2249	if (lsa == NULL)
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';
2262	header_ptr += 2;
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);
2266	}
2267	#endif
2268
2269	tptr = urlcopy + 1; /* skip first '/' */
2270
2271	#if ENABLE_FEATURE_HTTPD_CGI
2272	if (strncmp(tptr, "cgi-bin/", 8) == 0) {
2273	if (tptr[8] == '\0') {
2274	/* protect listing "cgi-bin/" */
2275	send_headers_and_exit(HTTP_FORBIDDEN);
2276	}
2277	send_cgi_and_exit(urlcopy, urlcopy, prequest, length, cookie, content_type);
2278	}
2279	#endif
2280
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.
2286	*/
2287	if (ENABLE_FEATURE_HTTPD_CGI)
2288	g_query = xstrdup(g_query); /* ok for NULL too */
2289	strcpy(urlp, index_page);
2290	}
2291	if (stat(tptr, &sb) == 0) {
2292	#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
2293	char *suffix = strrchr(tptr, '.');
2294	if (suffix) {
2295	Htaccess *cur;
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);
2299	}
2300	}
2301	}
2302	#endif
2303	file_size = sb.st_size;
2304	last_mod = sb.st_mtime;
2305	}
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);
2313	}
2314	}
2315	/* else fall through to send_file, it errors out if open fails: */
2316
2317	if (prequest != request_GET && prequest != request_HEAD) {
2318	/* POST for files does not make sense */
2319	send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2320	}
2321	send_file_and_exit(tptr,
2322	(prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS)
2323	);
2324	#else
2325	send_file_and_exit(tptr, SEND_HEADERS_AND_BODY);
2326	#endif
2327	}
2328
2329	/*
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.
2333	* Never returns.
2334	*/
2335	#if BB_MMU
2336	static void mini_httpd(int server_socket) NORETURN;
2337	static void mini_httpd(int server_socket)
2338	{
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.
2343	*/
2344	while (1) {
2345	int n;
2346	len_and_sockaddr fromAddr;
2347
2348	/* Wait for connections... */
2349	fromAddr.len = LSA_SIZEOF_SA;
2350	n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2351	if (n < 0)
2352	continue;
2353
2354	/* set the KEEPALIVE option to cull dead connections */
2355	setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2356
2357	if (fork() == 0) {
2358	/* child */
2359	/* Do not reload config on HUP */
2360	signal(SIGHUP, SIG_IGN);
2361	close(server_socket);
2362	xmove_fd(n, 0);
2363	xdup2(0, 1);
2364
2365	handle_incoming_and_exit(&fromAddr);
2366	}
2367	/* parent, or fork failed */
2368	close(n);
2369	} /* while (1) */
2370	/* never reached */
2371	}
2372	#else
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)
2375	{
2376	char *argv_copy[argc + 2];
2377
2378	argv_copy[0] = argv[0];
2379	argv_copy[1] = (char*)"-i";
2380	memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2381
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.
2386	*/
2387	while (1) {
2388	int n;
2389	len_and_sockaddr fromAddr;
2390
2391	/* Wait for connections... */
2392	fromAddr.len = LSA_SIZEOF_SA;
2393	n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2394	if (n < 0)
2395	continue;
2396
2397	/* set the KEEPALIVE option to cull dead connections */
2398	setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2399
2400	if (vfork() == 0) {
2401	/* child */
2402	/* Do not reload config on HUP */
2403	signal(SIGHUP, SIG_IGN);
2404	close(server_socket);
2405	xmove_fd(n, 0);
2406	xdup2(0, 1);
2407
2408	/* Run a copy of ourself in inetd mode */
2409	re_exec(argv_copy);
2410	}
2411	argv_copy[0][0] &= 0x7f;
2412	/* parent, or vfork failed */
2413	close(n);
2414	} /* while (1) */
2415	/* never reached */
2416	}
2417	#endif
2418
2419	/*
2420	* Process a HTTP connection on stdin/out.
2421	* Never returns.
2422	*/
2423	static void mini_httpd_inetd(void) NORETURN;
2424	static void mini_httpd_inetd(void)
2425	{
2426	len_and_sockaddr fromAddr;
2427
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);
2433	}
2434
2435	static void sighup_handler(int sig UNUSED_PARAM)
2436	{
2437	parse_conf(DEFAULT_PATH_HTTPD_CONF, SIGNALED_PARSE);
2438	}
2439
2440	enum {
2441	c_opt_config_file = 0,
2442	d_opt_decode_url,
2443	h_opt_home_httpd,
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 ,)
2448	p_opt_port ,
2449	p_opt_inetd ,
2450	p_opt_foreground,
2451	p_opt_verbose ,
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,
2463	};
2464
2465
2466	int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2467	int httpd_main(int argc UNUSED_PARAM, char **argv)
2468	{
2469	int server_socket = server_socket; /* for gcc */
2470	unsigned opt;
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;)
2476
2477	INIT_G();
2478
2479	#if ENABLE_LOCALE_SUPPORT
2480	/* Undo busybox.c: we want to speak English in http (dates etc) */
2481	setlocale(LC_TIME, "C");
2482	#endif
2483
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:")
2495	"p:ifv",
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
2502	, &verbose
2503	);
2504	if (opt & OPT_DECODE_URL) {
2505	fputs(percent_decode_in_place(url_for_decode, /*strict:*/ 0), stdout);
2506	return 0;
2507	}
2508	#if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2509	if (opt & OPT_ENCODE_URL) {
2510	fputs(encodeString(url_for_encode), stdout);
2511	return 0;
2512	}
2513	#endif
2514	#if ENABLE_FEATURE_HTTPD_AUTH_MD5
2515	if (opt & OPT_MD5) {
2516	char salt[sizeof("$1$XXXXXXXX")];
2517	salt[0] = '$';
2518	salt[1] = '1';
2519	salt[2] = '$';
2520	crypt_make_salt(salt + 3, 4);
2521	puts(pw_encrypt(pass, salt, /*cleanup:*/ 0));
2522	return 0;
2523	}
2524	#endif
2525	#if ENABLE_FEATURE_HTTPD_SETUID
2526	if (opt & OPT_SETUID) {
2527	xget_uidgid(&ugid, s_ugid);
2528	}
2529	#endif
2530
2531	#if !BB_MMU
2532	if (!(opt & OPT_FOREGROUND)) {
2533	bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2534	}
2535	#endif
2536
2537	xchdir(home_httpd);
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");
2547	xsetgid(ugid.gid);
2548	}
2549	xsetuid(ugid.uid);
2550	}
2551	#endif
2552	}
2553
2554	#if 0
2555	/* User can do it himself: 'env - PATH="$PATH" httpd'
2556	* We don't do it because we don't want to screw users
2557	* which want to do
2558	* 'env - VAR1=val1 VAR2=val2 httpd'
2559	* and have VAR1 and VAR2 values visible in their CGIs.
2560	* Besides, it is also smaller. */
2561	{
2562	char *p = getenv("PATH");
2563	/* env strings themself are not freed, no need to xstrdup(p): */
2564	clearenv();
2565	if (p)
2566	putenv(p - 5);
2567	// if (!(opt & OPT_INETD))
2568	// setenv_long("SERVER_PORT", ???);
2569	}
2570	#endif
2571
2572	parse_conf(DEFAULT_PATH_HTTPD_CONF, FIRST_PARSE);
2573	if (!(opt & OPT_INETD))
2574	signal(SIGHUP, sighup_handler);
2575
2576	xfunc_error_retval = 0;
2577	if (opt & OPT_INETD)
2578	mini_httpd_inetd();
2579	#if BB_MMU
2580	if (!(opt & OPT_FOREGROUND))
2581	bb_daemonize(0); /* don't change current directory */
2582	mini_httpd(server_socket); /* never returns */
2583	#else
2584	mini_httpd_nommu(server_socket, argc, argv); /* never returns */
2585	#endif
2586	/* return 0; */
2587	}
2588