remove trailing whitespace
[people/mcb30/busybox.git] / networking / httpd.c
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  * simplify patch stolen from libbb without using strdup
9  *
10  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
11  *
12  *****************************************************************************
13  *
14  * Typical usage:
15  *   for non root user
16  * httpd -p 8080 -h $HOME/public_html
17  *   or for daemon start from rc script with uid=0:
18  * httpd -u www
19  * This is equivalent if www user have uid=80 to
20  * httpd -p 80 -u 80 -h /www -c /etc/httpd.conf -r "Web Server Authentication"
21  *
22  *
23  * When a url starts by "/cgi-bin/" it is assumed to be a cgi script.  The
24  * server changes directory to the location of the script and executes it
25  * after setting QUERY_STRING and other environment variables.
26  *
27  * Doc:
28  * "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html
29  *
30  * The server can also be invoked as a url arg decoder and html text encoder
31  * as follows:
32  *  foo=`httpd -d $foo`           # decode "Hello%20World" as "Hello World"
33  *  bar=`httpd -e "<Hello World>"`  # encode as "&#60Hello&#32World&#62"
34  * Note that url encoding for arguments is not the same as html encoding for
35  * presentation.  -d decodes a url-encoded argument while -e encodes in html
36  * for page display.
37  *
38  * httpd.conf has the following format:
39  *
40  * A:172.20.         # Allow address from 172.20.0.0/16
41  * A:10.0.0.0/25     # Allow any address from 10.0.0.0-10.0.0.127
42  * A:10.0.0.0/255.255.255.128  # Allow any address that previous set
43  * A:127.0.0.1       # Allow local loopback connections
44  * D:*               # Deny from other IP connections
45  * E404:/path/e404.html # /path/e404.html is the 404 (not found) error page
46  * /cgi-bin:foo:bar  # Require user foo, pwd bar on urls starting with /cgi-bin/
47  * /adm:admin:setup  # Require user admin, pwd setup on urls starting with /adm/
48  * /adm:toor:PaSsWd  # or user toor, pwd PaSsWd on urls starting with /adm/
49  * .au:audio/basic   # additional mime type for audio.au files
50  * *.php:/path/php   # running cgi.php scripts through an interpreter
51  *
52  * A/D may be as a/d or allow/deny - first char case insensitive
53  * Deny IP rules take precedence over allow rules.
54  *
55  *
56  * The Deny/Allow IP logic:
57  *
58  *  - Default is to allow all.  No addresses are denied unless
59  *         denied with a D: rule.
60  *  - Order of Deny/Allow rules is significant
61  *  - Deny rules take precedence over allow rules.
62  *  - If a deny all rule (D:*) is used it acts as a catch-all for unmatched
63  *       addresses.
64  *  - Specification of Allow all (A:*) is a no-op
65  *
66  * Example:
67  *   1. Allow only specified addresses
68  *     A:172.20          # Allow any address that begins with 172.20.
69  *     A:10.10.          # Allow any address that begins with 10.10.
70  *     A:127.0.0.1       # Allow local loopback connections
71  *     D:*               # Deny from other IP connections
72  *
73  *   2. Only deny specified addresses
74  *     D:1.2.3.        # deny from 1.2.3.0 - 1.2.3.255
75  *     D:2.3.4.        # deny from 2.3.4.0 - 2.3.4.255
76  *     A:*             # (optional line added for clarity)
77  *
78  * If a sub directory contains a config file it is parsed and merged with
79  * any existing settings as if it was appended to the original configuration.
80  *
81  * subdir paths are relative to the containing subdir and thus cannot
82  * affect the parent rules.
83  *
84  * Note that since the sub dir is parsed in the forked thread servicing the
85  * subdir http request, any merge is discarded when the process exits.  As a
86  * result, the subdir settings only have a lifetime of a single request.
87  *
88  * Custom error pages can contain an absolute path or be relative to
89  * 'home_httpd'. Error pages are to be static files (no CGI or script). Error
90  * page can only be defined in the root configuration file and are not taken
91  * into account in local (directories) config files.
92  *
93  * If -c is not set, an attempt will be made to open the default
94  * root configuration file.  If -c is set and the file is not found, the
95  * server exits with an error.
96  *
97  */
98
99 #include "libbb.h"
100 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
101 #include <sys/sendfile.h>
102 #endif
103
104 //#define DEBUG 1
105 #define DEBUG 0
106
107 #define IOBUF_SIZE 8192    /* IO buffer */
108
109 /* amount of buffering in a pipe */
110 #ifndef PIPE_BUF
111 # define PIPE_BUF 4096
112 #endif
113 #if PIPE_BUF >= IOBUF_SIZE
114 # error "PIPE_BUF >= IOBUF_SIZE"
115 #endif
116
117 #define HEADER_READ_TIMEOUT 60
118
119 static const char default_path_httpd_conf[] ALIGN1 = "/etc";
120 static const char httpd_conf[] ALIGN1 = "httpd.conf";
121 static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
122
123 typedef struct has_next_ptr {
124         struct has_next_ptr *next;
125 } has_next_ptr;
126
127 /* Must have "next" as a first member */
128 typedef struct Htaccess {
129         struct Htaccess *next;
130         char *after_colon;
131         char before_colon[1];  /* really bigger, must be last */
132 } Htaccess;
133
134 /* Must have "next" as a first member */
135 typedef struct Htaccess_IP {
136         struct Htaccess_IP *next;
137         unsigned ip;
138         unsigned mask;
139         int allow_deny;
140 } Htaccess_IP;
141
142 enum {
143         HTTP_OK = 200,
144         HTTP_PARTIAL_CONTENT = 206,
145         HTTP_MOVED_TEMPORARILY = 302,
146         HTTP_BAD_REQUEST = 400,       /* malformed syntax */
147         HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
148         HTTP_NOT_FOUND = 404,
149         HTTP_FORBIDDEN = 403,
150         HTTP_REQUEST_TIMEOUT = 408,
151         HTTP_NOT_IMPLEMENTED = 501,   /* used for unrecognized requests */
152         HTTP_INTERNAL_SERVER_ERROR = 500,
153         HTTP_CONTINUE = 100,
154 #if 0   /* future use */
155         HTTP_SWITCHING_PROTOCOLS = 101,
156         HTTP_CREATED = 201,
157         HTTP_ACCEPTED = 202,
158         HTTP_NON_AUTHORITATIVE_INFO = 203,
159         HTTP_NO_CONTENT = 204,
160         HTTP_MULTIPLE_CHOICES = 300,
161         HTTP_MOVED_PERMANENTLY = 301,
162         HTTP_NOT_MODIFIED = 304,
163         HTTP_PAYMENT_REQUIRED = 402,
164         HTTP_BAD_GATEWAY = 502,
165         HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
166         HTTP_RESPONSE_SETSIZE = 0xffffffff
167 #endif
168 };
169
170 static const uint16_t http_response_type[] ALIGN2 = {
171         HTTP_OK,
172 #if ENABLE_FEATURE_HTTPD_RANGES
173         HTTP_PARTIAL_CONTENT,
174 #endif
175         HTTP_MOVED_TEMPORARILY,
176         HTTP_REQUEST_TIMEOUT,
177         HTTP_NOT_IMPLEMENTED,
178 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
179         HTTP_UNAUTHORIZED,
180 #endif
181         HTTP_NOT_FOUND,
182         HTTP_BAD_REQUEST,
183         HTTP_FORBIDDEN,
184         HTTP_INTERNAL_SERVER_ERROR,
185 #if 0   /* not implemented */
186         HTTP_CREATED,
187         HTTP_ACCEPTED,
188         HTTP_NO_CONTENT,
189         HTTP_MULTIPLE_CHOICES,
190         HTTP_MOVED_PERMANENTLY,
191         HTTP_NOT_MODIFIED,
192         HTTP_BAD_GATEWAY,
193         HTTP_SERVICE_UNAVAILABLE,
194 #endif
195 };
196
197 static const struct {
198         const char *name;
199         const char *info;
200 } http_response[ARRAY_SIZE(http_response_type)] = {
201         { "OK", NULL },
202 #if ENABLE_FEATURE_HTTPD_RANGES
203         { "Partial Content", NULL },
204 #endif
205         { "Found", NULL },
206         { "Request Timeout", "No request appeared within 60 seconds" },
207         { "Not Implemented", "The requested method is not recognized" },
208 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
209         { "Unauthorized", "" },
210 #endif
211         { "Not Found", "The requested URL was not found" },
212         { "Bad Request", "Unsupported method" },
213         { "Forbidden", ""  },
214         { "Internal Server Error", "Internal Server Error" },
215 #if 0   /* not implemented */
216         { "Created" },
217         { "Accepted" },
218         { "No Content" },
219         { "Multiple Choices" },
220         { "Moved Permanently" },
221         { "Not Modified" },
222         { "Bad Gateway", "" },
223         { "Service Unavailable", "" },
224 #endif
225 };
226
227
228 struct globals {
229         int verbose;            /* must be int (used by getopt32) */
230         smallint flg_deny_all;
231
232         unsigned rmt_ip;        /* used for IP-based allow/deny rules */
233         time_t last_mod;
234         char *rmt_ip_str;       /* for $REMOTE_ADDR and $REMOTE_PORT */
235         const char *bind_addr_or_port;
236
237         const char *g_query;
238         const char *configFile;
239         const char *home_httpd;
240
241         const char *found_mime_type;
242         const char *found_moved_temporarily;
243         Htaccess_IP *ip_a_d;    /* config allow/deny lines */
244
245         USE_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
246         USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
247         USE_FEATURE_HTTPD_CGI(char *referer;)
248         USE_FEATURE_HTTPD_CGI(char *user_agent;)
249
250         off_t file_size;        /* -1 - unknown */
251 #if ENABLE_FEATURE_HTTPD_RANGES
252         off_t range_start;
253         off_t range_end;
254         off_t range_len;
255 #endif
256
257 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
258         Htaccess *g_auth;       /* config user:password lines */
259 #endif
260 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
261         Htaccess *mime_a;       /* config mime types */
262 #endif
263 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
264         Htaccess *script_i;     /* config script interpreters */
265 #endif
266         char *iobuf;            /* [IOBUF_SIZE] */
267 #define hdr_buf bb_common_bufsiz1
268         char *hdr_ptr;
269         int hdr_cnt;
270 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
271         const char *http_error_page[ARRAY_SIZE(http_response_type)];
272 #endif
273 };
274 #define G (*ptr_to_globals)
275 #define verbose           (G.verbose          )
276 #define flg_deny_all      (G.flg_deny_all     )
277 #define rmt_ip            (G.rmt_ip           )
278 #define bind_addr_or_port (G.bind_addr_or_port)
279 #define g_query           (G.g_query          )
280 #define configFile        (G.configFile       )
281 #define home_httpd        (G.home_httpd       )
282 #define found_mime_type   (G.found_mime_type  )
283 #define found_moved_temporarily (G.found_moved_temporarily)
284 #define last_mod          (G.last_mod         )
285 #define ip_a_d            (G.ip_a_d           )
286 #define g_realm           (G.g_realm          )
287 #define remoteuser        (G.remoteuser       )
288 #define referer           (G.referer          )
289 #define user_agent        (G.user_agent       )
290 #define file_size         (G.file_size        )
291 #if ENABLE_FEATURE_HTTPD_RANGES
292 #define range_start       (G.range_start      )
293 #define range_end         (G.range_end        )
294 #define range_len         (G.range_len        )
295 #endif
296 #define rmt_ip_str        (G.rmt_ip_str       )
297 #define g_auth            (G.g_auth           )
298 #define mime_a            (G.mime_a           )
299 #define script_i          (G.script_i         )
300 #define iobuf             (G.iobuf            )
301 #define hdr_ptr           (G.hdr_ptr          )
302 #define hdr_cnt           (G.hdr_cnt          )
303 #define http_error_page   (G.http_error_page  )
304 #define INIT_G() do { \
305         PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
306         USE_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
307         bind_addr_or_port = "80"; \
308         file_size = -1; \
309 } while (0)
310
311 #if !ENABLE_FEATURE_HTTPD_RANGES
312 enum {
313         range_start = 0,
314         range_end = MAXINT(off_t) - 1,
315         range_len = MAXINT(off_t),
316 };
317 #endif
318
319
320 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
321
322 /* Prototypes */
323 static void send_file_and_exit(const char *url, int headers) ATTRIBUTE_NORETURN;
324
325 static void free_llist(has_next_ptr **pptr)
326 {
327         has_next_ptr *cur = *pptr;
328         while (cur) {
329                 has_next_ptr *t = cur;
330                 cur = cur->next;
331                 free(t);
332         }
333         *pptr = NULL;
334 }
335
336 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
337  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
338  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
339 static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
340 {
341         free_llist((has_next_ptr**)pptr);
342 }
343 #endif
344
345 static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
346 {
347         free_llist((has_next_ptr**)pptr);
348 }
349
350 /* Returns presumed mask width in bits or < 0 on error.
351  * Updates strp, stores IP at provided pointer */
352 static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
353 {
354         const char *p = *strp;
355         int auto_mask = 8;
356         unsigned ip = 0;
357         int j;
358
359         if (*p == '/')
360                 return -auto_mask;
361
362         for (j = 0; j < 4; j++) {
363                 unsigned octet;
364
365                 if ((*p < '0' || *p > '9') && *p != '/' && *p)
366                         return -auto_mask;
367                 octet = 0;
368                 while (*p >= '0' && *p <= '9') {
369                         octet *= 10;
370                         octet += *p - '0';
371                         if (octet > 255)
372                                 return -auto_mask;
373                         p++;
374                 }
375                 if (*p == '.')
376                         p++;
377                 if (*p != '/' && *p)
378                         auto_mask += 8;
379                 ip = (ip << 8) | octet;
380         }
381         if (*p) {
382                 if (*p != endc)
383                         return -auto_mask;
384                 p++;
385                 if (*p == '\0')
386                         return -auto_mask;
387         }
388         *ipp = ip;
389         *strp = p;
390         return auto_mask;
391 }
392
393 /* Returns 0 on success. Stores IP and mask at provided pointers */
394 static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
395 {
396         int i;
397         unsigned mask;
398         char *p;
399
400         i = scan_ip(&str, ipp, '/');
401         if (i < 0)
402                 return i;
403
404         if (*str) {
405                 /* there is /xxx after dotted-IP address */
406                 i = bb_strtou(str, &p, 10);
407                 if (*p == '.') {
408                         /* 'xxx' itself is dotted-IP mask, parse it */
409                         /* (return 0 (success) only if it has N.N.N.N form) */
410                         return scan_ip(&str, maskp, '\0') - 32;
411                 }
412                 if (*p)
413                         return -1;
414         }
415
416         if (i > 32)
417                 return -1;
418
419         if (sizeof(unsigned) == 4 && i == 32) {
420                 /* mask >>= 32 below may not work */
421                 mask = 0;
422         } else {
423                 mask = 0xffffffff;
424                 mask >>= i;
425         }
426         /* i == 0 -> *maskp = 0x00000000
427          * i == 1 -> *maskp = 0x80000000
428          * i == 4 -> *maskp = 0xf0000000
429          * i == 31 -> *maskp = 0xfffffffe
430          * i == 32 -> *maskp = 0xffffffff */
431         *maskp = (uint32_t)(~mask);
432         return 0;
433 }
434
435 /*
436  * Parse configuration file into in-memory linked list.
437  *
438  * The first non-white character is examined to determine if the config line
439  * is one of the following:
440  *    .ext:mime/type   # new mime type not compiled into httpd
441  *    [adAD]:from      # ip address allow/deny, * for wildcard
442  *    /path:user:pass  # username/password
443  *    Ennn:error.html  # error page for status nnn
444  *
445  * Any previous IP rules are discarded.
446  * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
447  * are also discarded.  That is, previous settings are retained if flag is
448  * SUBDIR_PARSE.
449  * Error pages are only parsed on the main config file.
450  *
451  * path   Path where to look for httpd.conf (without filename).
452  * flag   Type of the parse request.
453  */
454 /* flag */
455 #define FIRST_PARSE          0
456 #define SUBDIR_PARSE         1
457 #define SIGNALED_PARSE       2
458 #define FIND_FROM_HTTPD_ROOT 3
459 static void parse_conf(const char *path, int flag)
460 {
461         FILE *f;
462 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
463         Htaccess *prev;
464 #endif
465 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
466  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
467  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
468         Htaccess *cur;
469 #endif
470         const char *cf = configFile;
471         char buf[160];
472         char *p0 = NULL;
473         char *c, *p;
474         Htaccess_IP *pip;
475
476         /* discard old rules */
477         free_Htaccess_IP_list(&ip_a_d);
478         flg_deny_all = 0;
479 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
480  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
481  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
482         /* retain previous auth and mime config only for subdir parse */
483         if (flag != SUBDIR_PARSE) {
484 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
485                 free_Htaccess_list(&g_auth);
486 #endif
487 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
488                 free_Htaccess_list(&mime_a);
489 #endif
490 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
491                 free_Htaccess_list(&script_i);
492 #endif
493         }
494 #endif
495
496         if (flag == SUBDIR_PARSE || cf == NULL) {
497                 cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
498                 sprintf((char *)cf, "%s/%s", path, httpd_conf);
499         }
500
501         while ((f = fopen(cf, "r")) == NULL) {
502                 if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
503                         /* config file not found, no changes to config */
504                         return;
505                 }
506                 if (configFile && flag == FIRST_PARSE) /* if -c option given */
507                         bb_simple_perror_msg_and_die(cf);
508                 flag = FIND_FROM_HTTPD_ROOT;
509                 cf = httpd_conf;
510         }
511
512 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
513         prev = g_auth;
514 #endif
515         /* This could stand some work */
516         while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
517                 c = NULL;
518                 for (p = p0; *p0 != '\0' && *p0 != '#'; p0++) {
519                         if (!isspace(*p0)) {
520                                 *p++ = *p0;
521                                 if (*p0 == ':' && c == NULL)
522                                         c = p;
523                         }
524                 }
525                 *p = '\0';
526
527                 /* test for empty or strange line */
528                 if (c == NULL || *c == '\0')
529                         continue;
530                 p0 = buf;
531                 if (*p0 == 'd')
532                         *p0 = 'D';
533                 if (*c == '*') {
534                         if (*p0 == 'D') {
535                                 /* memorize deny all */
536                                 flg_deny_all = 1;
537                         }
538                         /* skip default other "word:*" config lines */
539                         continue;
540                 }
541
542                 if (*p0 == 'a')
543                         *p0 = 'A';
544                 if (*p0 == 'A' || *p0 == 'D') {
545                         /* storing current config IP line */
546                         pip = xzalloc(sizeof(Htaccess_IP));
547                         if (pip) {
548                                 if (scan_ip_mask(c, &(pip->ip), &(pip->mask))) {
549                                         /* syntax IP{/mask} error detected, protect all */
550                                         *p0 = 'D';
551                                         pip->mask = 0;
552                                 }
553                                 pip->allow_deny = *p0;
554                                 if (*p0 == 'D') {
555                                         /* Deny:from_IP move top */
556                                         pip->next = ip_a_d;
557                                         ip_a_d = pip;
558                                 } else {
559                                         /* add to bottom A:form_IP config line */
560                                         Htaccess_IP *prev_IP = ip_a_d;
561
562                                         if (prev_IP == NULL) {
563                                                 ip_a_d = pip;
564                                         } else {
565                                                 while (prev_IP->next)
566                                                         prev_IP = prev_IP->next;
567                                                 prev_IP->next = pip;
568                                         }
569                                 }
570                         }
571                         continue;
572                 }
573
574 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
575                 if (flag == FIRST_PARSE && *p0 == 'E') {
576                         int i;
577                         /* error status code */
578                         int status = atoi(++p0);
579                         /* c already points at the character following ':' in parse loop */
580                         /* c = strchr(p0, ':'); c++; */
581                         if (status < HTTP_CONTINUE) {
582                                 bb_error_msg("config error '%s' in '%s'", buf, cf);
583                                 continue;
584                         }
585
586                         /* then error page; find matching status */
587                         for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
588                                 if (http_response_type[i] == status) {
589                                         http_error_page[i] = concat_path_file((*c == '/') ? NULL : home_httpd, c);
590                                         break;
591                                 }
592                         }
593                         continue;
594                 }
595 #endif
596
597 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
598                 if (*p0 == '/') {
599                         /* make full path from httpd root / current_path / config_line_path */
600                         cf = (flag == SUBDIR_PARSE ? path : "");
601                         p0 = xmalloc(strlen(cf) + (c - buf) + 2 + strlen(c));
602                         c[-1] = '\0';
603                         sprintf(p0, "/%s%s", cf, buf);
604
605                         /* another call bb_simplify_path */
606                         cf = p = p0;
607
608                         do {
609                                 if (*p == '/') {
610                                         if (*cf == '/') {    /* skip duplicate (or initial) slash */
611                                                 continue;
612                                         }
613                                         if (*cf == '.') {
614                                                 if (cf[1] == '/' || cf[1] == '\0') { /* remove extra '.' */
615                                                         continue;
616                                                 }
617                                                 if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == '\0')) {
618                                                         ++cf;
619                                                         if (p > p0) {
620                                                                 while (*--p != '/') /* omit previous dir */;
621                                                         }
622                                                         continue;
623                                                 }
624                                         }
625                                 }
626                                 *++p = *cf;
627                         } while (*++cf);
628
629                         if ((p == p0) || (*p != '/')) {      /* not a trailing slash */
630                                 ++p;                             /* so keep last character */
631                         }
632                         *p = ':';
633                         strcpy(p + 1, c);
634                 }
635 #endif
636
637 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
638  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
639  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
640                 /* storing current config line */
641                 cur = xzalloc(sizeof(Htaccess) + strlen(p0));
642                 if (cur) {
643                         cf = strcpy(cur->before_colon, p0);
644                         c = strchr(cf, ':');
645                         *c++ = 0;
646                         cur->after_colon = c;
647 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
648                         if (*cf == '.') {
649                                 /* config .mime line move top for overwrite previous */
650                                 cur->next = mime_a;
651                                 mime_a = cur;
652                                 continue;
653                         }
654 #endif
655 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
656                         if (*cf == '*' && cf[1] == '.') {
657                                 /* config script interpreter line move top for overwrite previous */
658                                 cur->next = script_i;
659                                 script_i = cur;
660                                 continue;
661                         }
662 #endif
663 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
664                         free(p0);
665                         if (prev == NULL) {
666                                 /* first line */
667                                 g_auth = prev = cur;
668                         } else {
669                                 /* sort path, if current lenght eq or bigger then move up */
670                                 Htaccess *prev_hti = g_auth;
671                                 size_t l = strlen(cf);
672                                 Htaccess *hti;
673
674                                 for (hti = prev_hti; hti; hti = hti->next) {
675                                         if (l >= strlen(hti->before_colon)) {
676                                                 /* insert before hti */
677                                                 cur->next = hti;
678                                                 if (prev_hti != hti) {
679                                                         prev_hti->next = cur;
680                                                 } else {
681                                                         /* insert as top */
682                                                         g_auth = cur;
683                                                 }
684                                                 break;
685                                         }
686                                         if (prev_hti != hti)
687                                                 prev_hti = prev_hti->next;
688                                 }
689                                 if (!hti) {       /* not inserted, add to bottom */
690                                         prev->next = cur;
691                                         prev = cur;
692                                 }
693                         }
694 #endif
695                 }
696 #endif
697          }
698          fclose(f);
699 }
700
701 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
702 /*
703  * Given a string, html-encode special characters.
704  * This is used for the -e command line option to provide an easy way
705  * for scripts to encode result data without confusing browsers.  The
706  * returned string pointer is memory allocated by malloc().
707  *
708  * Returns a pointer to the encoded string (malloced).
709  */
710 static char *encodeString(const char *string)
711 {
712         /* take the simple route and encode everything */
713         /* could possibly scan once to get length.     */
714         int len = strlen(string);
715         char *out = xmalloc(len * 6 + 1);
716         char *p = out;
717         char ch;
718
719         while ((ch = *string++)) {
720                 /* very simple check for what to encode */
721                 if (isalnum(ch))
722                         *p++ = ch;
723                 else
724                         p += sprintf(p, "&#%d;", (unsigned char) ch);
725         }
726         *p = '\0';
727         return out;
728 }
729 #endif          /* FEATURE_HTTPD_ENCODE_URL_STR */
730
731 /*
732  * Given a URL encoded string, convert it to plain ascii.
733  * Since decoding always makes strings smaller, the decode is done in-place.
734  * Thus, callers should strdup() the argument if they do not want the
735  * argument modified.  The return is the original pointer, allowing this
736  * function to be easily used as arguments to other functions.
737  *
738  * string    The first string to decode.
739  * option_d  1 if called for httpd -d
740  *
741  * Returns a pointer to the decoded string (same as input).
742  */
743 static unsigned hex_to_bin(unsigned char c)
744 {
745         unsigned v;
746
747         v = c - '0';
748         if (v <= 9)
749                 return v;
750         /* c | 0x20: letters to lower case, non-letters
751          * to (potentially different) non-letters */
752         v = (unsigned)(c | 0x20) - 'a';
753         if (v <= 5)
754                 return v + 10;
755         return ~0;
756 }
757 /* For testing:
758 void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
759 int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
760 t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
761 */
762 static char *decodeString(char *orig, int option_d)
763 {
764         /* note that decoded string is always shorter than original */
765         char *string = orig;
766         char *ptr = string;
767         char c;
768
769         while ((c = *ptr++) != '\0') {
770                 unsigned v;
771
772                 if (option_d && c == '+') {
773                         *string++ = ' ';
774                         continue;
775                 }
776                 if (c != '%') {
777                         *string++ = c;
778                         continue;
779                 }
780                 v = hex_to_bin(ptr[0]);
781                 if (v > 15) {
782  bad_hex:
783                         if (!option_d)
784                                 return NULL;
785                         *string++ = '%';
786                         continue;
787                 }
788                 v = (v * 16) | hex_to_bin(ptr[1]);
789                 if (v > 255)
790                         goto bad_hex;
791                 if (!option_d && (v == '/' || v == '\0')) {
792                         /* caller takes it as indication of invalid
793                          * (dangerous wrt exploits) chars */
794                         return orig + 1;
795                 }
796                 *string++ = v;
797                 ptr += 2;
798         }
799         *string = '\0';
800         return orig;
801 }
802
803 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
804 /*
805  * Decode a base64 data stream as per rfc1521.
806  * Note that the rfc states that non base64 chars are to be ignored.
807  * Since the decode always results in a shorter size than the input,
808  * it is OK to pass the input arg as an output arg.
809  * Parameter: a pointer to a base64 encoded string.
810  * Decoded data is stored in-place.
811  */
812 static void decodeBase64(char *Data)
813 {
814         const unsigned char *in = (const unsigned char *)Data;
815         /* The decoded size will be at most 3/4 the size of the encoded */
816         unsigned ch = 0;
817         int i = 0;
818
819         while (*in) {
820                 int t = *in++;
821
822                 if (t >= '0' && t <= '9')
823                         t = t - '0' + 52;
824                 else if (t >= 'A' && t <= 'Z')
825                         t = t - 'A';
826                 else if (t >= 'a' && t <= 'z')
827                         t = t - 'a' + 26;
828                 else if (t == '+')
829                         t = 62;
830                 else if (t == '/')
831                         t = 63;
832                 else if (t == '=')
833                         t = 0;
834                 else
835                         continue;
836
837                 ch = (ch << 6) | t;
838                 i++;
839                 if (i == 4) {
840                         *Data++ = (char) (ch >> 16);
841                         *Data++ = (char) (ch >> 8);
842                         *Data++ = (char) ch;
843                         i = 0;
844                 }
845         }
846         *Data = '\0';
847 }
848 #endif
849
850 /*
851  * Create a listen server socket on the designated port.
852  */
853 static int openServer(void)
854 {
855         int n = bb_strtou(bind_addr_or_port, NULL, 10);
856         if (!errno && n && n <= 0xffff)
857                 n = create_and_bind_stream_or_die(NULL, n);
858         else
859                 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
860         xlisten(n, 9);
861         return n;
862 }
863
864 /*
865  * Log the connection closure and exit.
866  */
867 static void log_and_exit(void) ATTRIBUTE_NORETURN;
868 static void log_and_exit(void)
869 {
870         /* Paranoia. IE said to be buggy. It may send some extra data
871          * or be confused by us just exiting without SHUT_WR. Oh well. */
872         shutdown(1, SHUT_WR);
873         ndelay_on(0);
874         while (read(0, iobuf, IOBUF_SIZE) > 0)
875                 continue;
876
877         if (verbose > 2)
878                 bb_error_msg("closed");
879         _exit(xfunc_error_retval);
880 }
881
882 /*
883  * Create and send HTTP response headers.
884  * The arguments are combined and sent as one write operation.  Note that
885  * IE will puke big-time if the headers are not sent in one packet and the
886  * second packet is delayed for any reason.
887  * responseNum - the result code to send.
888  */
889 static void send_headers(int responseNum)
890 {
891         static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
892
893         const char *responseString = "";
894         const char *infoString = NULL;
895         const char *mime_type;
896 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
897         const char *error_page = 0;
898 #endif
899         unsigned i;
900         time_t timer = time(0);
901         char tmp_str[80];
902         int len;
903
904         for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
905                 if (http_response_type[i] == responseNum) {
906                         responseString = http_response[i].name;
907                         infoString = http_response[i].info;
908 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
909                         error_page = http_error_page[i];
910 #endif
911                         break;
912                 }
913         }
914         /* error message is HTML */
915         mime_type = responseNum == HTTP_OK ?
916                                 found_mime_type : "text/html";
917
918         if (verbose)
919                 bb_error_msg("response:%u", responseNum);
920
921         /* emit the current date */
922         strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
923         len = sprintf(iobuf,
924                         "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
925                         "Date: %s\r\nConnection: close\r\n",
926                         responseNum, responseString, mime_type, tmp_str);
927
928 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
929         if (responseNum == HTTP_UNAUTHORIZED) {
930                 len += sprintf(iobuf + len,
931                                 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
932                                 g_realm);
933         }
934 #endif
935         if (responseNum == HTTP_MOVED_TEMPORARILY) {
936                 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
937                                 found_moved_temporarily,
938                                 (g_query ? "?" : ""),
939                                 (g_query ? g_query : ""));
940         }
941
942 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
943         if (error_page && !access(error_page, R_OK)) {
944                 strcat(iobuf, "\r\n");
945                 len += 2;
946
947                 if (DEBUG)
948                         fprintf(stderr, "headers: '%s'\n", iobuf);
949                 full_write(1, iobuf, len);
950                 if (DEBUG)
951                         fprintf(stderr, "writing error page: '%s'\n", error_page);
952                 return send_file_and_exit(error_page, FALSE);
953         }
954 #endif
955
956         if (file_size != -1) {    /* file */
957                 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
958 #if ENABLE_FEATURE_HTTPD_RANGES
959                 if (responseNum == HTTP_PARTIAL_CONTENT) {
960                         len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n",
961                                         range_start,
962                                         range_end,
963                                         file_size);
964                         file_size = range_end - range_start + 1;
965                 }
966 #endif
967                 len += sprintf(iobuf + len,
968 #if ENABLE_FEATURE_HTTPD_RANGES
969                         "Accept-Ranges: bytes\r\n"
970 #endif
971                         "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
972                                 tmp_str,
973                                 "Content-length:",
974                                 file_size
975                 );
976         }
977         iobuf[len++] = '\r';
978         iobuf[len++] = '\n';
979         if (infoString) {
980                 len += sprintf(iobuf + len,
981                                 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
982                                 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
983                                 responseNum, responseString,
984                                 responseNum, responseString, infoString);
985         }
986         if (DEBUG)
987                 fprintf(stderr, "headers: '%s'\n", iobuf);
988         if (full_write(1, iobuf, len) != len) {
989                 if (verbose > 1)
990                         bb_perror_msg("error");
991                 log_and_exit();
992         }
993 }
994
995 static void send_headers_and_exit(int responseNum) ATTRIBUTE_NORETURN;
996 static void send_headers_and_exit(int responseNum)
997 {
998         send_headers(responseNum);
999         log_and_exit();
1000 }
1001
1002 /*
1003  * Read from the socket until '\n' or EOF. '\r' chars are removed.
1004  * '\n' is replaced with NUL.
1005  * Return number of characters read or 0 if nothing is read
1006  * ('\r' and '\n' are not counted).
1007  * Data is returned in iobuf.
1008  */
1009 static int get_line(void)
1010 {
1011         int count = 0;
1012         char c;
1013
1014         while (1) {
1015                 if (hdr_cnt <= 0) {
1016                         hdr_cnt = safe_read(0, hdr_buf, sizeof(hdr_buf));
1017                         if (hdr_cnt <= 0)
1018                                 break;
1019                         hdr_ptr = hdr_buf;
1020                 }
1021                 iobuf[count] = c = *hdr_ptr++;
1022                 hdr_cnt--;
1023
1024                 if (c == '\r')
1025                         continue;
1026                 if (c == '\n') {
1027                         iobuf[count] = '\0';
1028                         return count;
1029                 }
1030                 if (count < (IOBUF_SIZE - 1))      /* check overflow */
1031                         count++;
1032         }
1033         return count;
1034 }
1035
1036 #if ENABLE_FEATURE_HTTPD_CGI
1037
1038 /* gcc 4.2.1 fares better with NOINLINE */
1039 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) ATTRIBUTE_NORETURN;
1040 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1041 {
1042         enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1043         struct pollfd pfd[3];
1044         int out_cnt; /* we buffer a bit of initial CGI output */
1045         int count;
1046
1047         /* iobuf is used for CGI -> network data,
1048          * hdr_buf is for network -> CGI data (POSTDATA) */
1049
1050         /* If CGI dies, we still want to correctly finish reading its output
1051          * and send it to the peer. So please no SIGPIPEs! */
1052         signal(SIGPIPE, SIG_IGN);
1053
1054         // We inconsistently handle a case when more POSTDATA from network
1055         // is coming than we expected. We may give *some part* of that
1056         // extra data to CGI.
1057
1058         //if (hdr_cnt > post_len) {
1059         //      /* We got more POSTDATA from network than we expected */
1060         //      hdr_cnt = post_len;
1061         //}
1062         post_len -= hdr_cnt;
1063         /* post_len - number of POST bytes not yet read from network */
1064
1065         /* NB: breaking out of this loop jumps to log_and_exit() */
1066         out_cnt = 0;
1067         while (1) {
1068                 memset(pfd, 0, sizeof(pfd));
1069
1070                 pfd[FROM_CGI].fd = fromCgi_rd;
1071                 pfd[FROM_CGI].events = POLLIN;
1072
1073                 if (toCgi_wr) {
1074                         pfd[TO_CGI].fd = toCgi_wr;
1075                         if (hdr_cnt > 0) {
1076                                 pfd[TO_CGI].events = POLLOUT;
1077                         } else if (post_len > 0) {
1078                                 pfd[0].events = POLLIN;
1079                         } else {
1080                                 /* post_len <= 0 && hdr_cnt <= 0:
1081                                  * no more POST data to CGI,
1082                                  * let CGI see EOF on CGI's stdin */
1083                                 close(toCgi_wr);
1084                                 toCgi_wr = 0;
1085                         }
1086                 }
1087
1088                 /* Now wait on the set of sockets */
1089                 count = safe_poll(pfd, 3, -1);
1090                 if (count <= 0) {
1091 #if 0
1092                         if (waitpid(pid, &status, WNOHANG) <= 0) {
1093                                 /* Weird. CGI didn't exit and no fd's
1094                                  * are ready, yet poll returned?! */
1095                                 continue;
1096                         }
1097                         if (DEBUG && WIFEXITED(status))
1098                                 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1099                         if (DEBUG && WIFSIGNALED(status))
1100                                 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1101 #endif
1102                         break;
1103                 }
1104
1105                 if (pfd[TO_CGI].revents) {
1106                         /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */
1107                         /* Have data from peer and can write to CGI */
1108                         count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1109                         /* Doesn't happen, we dont use nonblocking IO here
1110                          *if (count < 0 && errno == EAGAIN) {
1111                          *      ...
1112                          *} else */
1113                         if (count > 0) {
1114                                 hdr_ptr += count;
1115                                 hdr_cnt -= count;
1116                         } else {
1117                                 /* EOF/broken pipe to CGI, stop piping POST data */
1118                                 hdr_cnt = post_len = 0;
1119                         }
1120                 }
1121
1122                 if (pfd[0].revents) {
1123                         /* post_len > 0 && hdr_cnt == 0 here */
1124                         /* We expect data, prev data portion is eaten by CGI
1125                          * and there *is* data to read from the peer
1126                          * (POSTDATA) */
1127                         //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
1128                         //count = safe_read(0, hdr_buf, count);
1129                         count = safe_read(0, hdr_buf, sizeof(hdr_buf));
1130                         if (count > 0) {
1131                                 hdr_cnt = count;
1132                                 hdr_ptr = hdr_buf;
1133                                 post_len -= count;
1134                         } else {
1135                                 /* no more POST data can be read */
1136                                 post_len = 0;
1137                         }
1138                 }
1139
1140                 if (pfd[FROM_CGI].revents) {
1141                         /* There is something to read from CGI */
1142                         char *rbuf = iobuf;
1143
1144                         /* Are we still buffering CGI output? */
1145                         if (out_cnt >= 0) {
1146                                 /* HTTP_200[] has single "\r\n" at the end.
1147                                  * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1148                                  * CGI scripts MUST send their own header terminated by
1149                                  * empty line, then data. That's why we have only one
1150                                  * <cr><lf> pair here. We will output "200 OK" line
1151                                  * if needed, but CGI still has to provide blank line
1152                                  * between header and body */
1153
1154                                 /* Must use safe_read, not full_read, because
1155                                  * CGI may output a few first bytes and then wait
1156                                  * for POSTDATA without closing stdout.
1157                                  * With full_read we may wait here forever. */
1158                                 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1159                                 if (count <= 0) {
1160                                         /* eof (or error) and there was no "HTTP",
1161                                          * so write it, then write received data */
1162                                         if (out_cnt) {
1163                                                 full_write(1, HTTP_200, sizeof(HTTP_200)-1);
1164                                                 full_write(1, rbuf, out_cnt);
1165                                         }
1166                                         break; /* CGI stdout is closed, exiting */
1167                                 }
1168                                 out_cnt += count;
1169                                 count = 0;
1170                                 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1171                                 if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1172                                         /* send "HTTP/1.0 " */
1173                                         if (full_write(1, HTTP_200, 9) != 9)
1174                                                 break;
1175                                         rbuf += 8; /* skip "Status: " */
1176                                         count = out_cnt - 8;
1177                                         out_cnt = -1; /* buffering off */
1178                                 } else if (out_cnt >= 4) {
1179                                         /* Did CGI add "HTTP"? */
1180                                         if (memcmp(rbuf, HTTP_200, 4) != 0) {
1181                                                 /* there is no "HTTP", do it ourself */
1182                                                 if (full_write(1, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1183                                                         break;
1184                                         }
1185                                         /* Commented out:
1186                                         if (!strstr(rbuf, "ontent-")) {
1187                                                 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1188                                         }
1189                                          * Counter-example of valid CGI without Content-type:
1190                                          * echo -en "HTTP/1.0 302 Found\r\n"
1191                                          * echo -en "Location: http://www.busybox.net\r\n"
1192                                          * echo -en "\r\n"
1193                                          */
1194                                         count = out_cnt;
1195                                         out_cnt = -1; /* buffering off */
1196                                 }
1197                         } else {
1198                                 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1199                                 if (count <= 0)
1200                                         break;  /* eof (or error) */
1201                         }
1202                         if (full_write(1, rbuf, count) != count)
1203                                 break;
1204                         if (DEBUG)
1205                                 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1206                 } /* if (pfd[FROM_CGI].revents) */
1207         } /* while (1) */
1208         log_and_exit();
1209 }
1210
1211 static void setenv1(const char *name, const char *value)
1212 {
1213         setenv(name, value ? value : "", 1);
1214 }
1215
1216 /*
1217  * Spawn CGI script, forward CGI's stdin/out <=> network
1218  *
1219  * Environment variables are set up and the script is invoked with pipes
1220  * for stdin/stdout.  If a POST is being done the script is fed the POST
1221  * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1222  *
1223  * Parameters:
1224  * const char *url              The requested URL (with leading /).
1225  * int post_len                 Length of the POST body.
1226  * const char *cookie           For set HTTP_COOKIE.
1227  * const char *content_type     For set CONTENT_TYPE.
1228  */
1229 static void send_cgi_and_exit(
1230                 const char *url,
1231                 const char *request,
1232                 int post_len,
1233                 const char *cookie,
1234                 const char *content_type) ATTRIBUTE_NORETURN;
1235 static void send_cgi_and_exit(
1236                 const char *url,
1237                 const char *request,
1238                 int post_len,
1239                 const char *cookie,
1240                 const char *content_type)
1241 {
1242         struct { int rd; int wr; } fromCgi;  /* CGI -> httpd pipe */
1243         struct { int rd; int wr; } toCgi;    /* httpd -> CGI pipe */
1244         char *fullpath;
1245         char *script;
1246         char *purl;
1247         int pid;
1248
1249         /*
1250          * We are mucking with environment _first_ and then vfork/exec,
1251          * this allows us to use vfork safely. Parent don't care about
1252          * these environment changes anyway.
1253          */
1254
1255         /*
1256          * Find PATH_INFO.
1257          */
1258         purl = xstrdup(url);
1259         script = purl;
1260         while ((script = strchr(script + 1, '/')) != NULL) {
1261                 /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
1262                 struct stat sb;
1263
1264                 *script = '\0';
1265                 if (!is_directory(purl + 1, 1, &sb)) {
1266                         /* not directory, found script.cgi/PATH_INFO */
1267                         *script = '/';
1268                         break;
1269                 }
1270                 *script = '/';          /* is directory, find next '/' */
1271         }
1272         setenv1("PATH_INFO", script);   /* set /PATH_INFO or "" */
1273         setenv1("REQUEST_METHOD", request);
1274         if (g_query) {
1275                 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", purl, g_query));
1276         } else {
1277                 setenv1("REQUEST_URI", purl);
1278         }
1279         if (script != NULL)
1280                 *script = '\0';         /* cut off /PATH_INFO */
1281
1282         /* SCRIPT_FILENAME required by PHP in CGI mode */
1283         fullpath = concat_path_file(home_httpd, purl);
1284         setenv1("SCRIPT_FILENAME", fullpath);
1285         /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1286         setenv1("SCRIPT_NAME", purl);
1287         /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1288          * QUERY_STRING: The information which follows the ? in the URL
1289          * which referenced this script. This is the query information.
1290          * It should not be decoded in any fashion. This variable
1291          * should always be set when there is query information,
1292          * regardless of command line decoding. */
1293         /* (Older versions of bbox seem to do some decoding) */
1294         setenv1("QUERY_STRING", g_query);
1295         putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1296         putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1297         putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1298         /* Having _separate_ variables for IP and port defeats
1299          * the purpose of having socket abstraction. Which "port"
1300          * are you using on Unix domain socket?
1301          * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1302          * Oh well... */
1303         {
1304                 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1305                 char *cp = strrchr(p, ':');
1306                 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1307                         cp = NULL;
1308                 if (cp) *cp = '\0'; /* delete :PORT */
1309                 setenv1("REMOTE_ADDR", p);
1310                 if (cp) {
1311                         *cp = ':';
1312 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1313                         setenv1("REMOTE_PORT", cp + 1);
1314 #endif
1315                 }
1316         }
1317         setenv1("HTTP_USER_AGENT", user_agent);
1318         if (post_len)
1319                 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1320         if (cookie)
1321                 setenv1("HTTP_COOKIE", cookie);
1322         if (content_type)
1323                 setenv1("CONTENT_TYPE", content_type);
1324 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1325         if (remoteuser) {
1326                 setenv1("REMOTE_USER", remoteuser);
1327                 putenv((char*)"AUTH_TYPE=Basic");
1328         }
1329 #endif
1330         if (referer)
1331                 setenv1("HTTP_REFERER", referer);
1332
1333         xpipe(&fromCgi.rd);
1334         xpipe(&toCgi.rd);
1335
1336         pid = vfork();
1337         if (pid < 0) {
1338                 /* TODO: log perror? */
1339                 log_and_exit();
1340         }
1341
1342         if (!pid) {
1343                 /* Child process */
1344                 xfunc_error_retval = 242;
1345
1346                 xmove_fd(toCgi.rd, 0);  /* replace stdin with the pipe */
1347                 xmove_fd(fromCgi.wr, 1);  /* replace stdout with the pipe */
1348                 close(fromCgi.rd);
1349                 close(toCgi.wr);
1350                 /* User seeing stderr output can be a security problem.
1351                  * If CGI really wants that, it can always do dup itself. */
1352                 /* dup2(1, 2); */
1353
1354                 /* script must have absolute path */
1355                 script = strrchr(fullpath, '/');
1356                 if (!script)
1357                         goto error_execing_cgi;
1358                 *script = '\0';
1359                 /* chdiring to script's dir */
1360                 if (chdir(fullpath) == 0) {
1361                         char *argv[2];
1362 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1363                         char *interpr = NULL;
1364                         char *suffix = strrchr(purl, '.');
1365
1366                         if (suffix) {
1367                                 Htaccess *cur;
1368                                 for (cur = script_i; cur; cur = cur->next) {
1369                                         if (strcmp(cur->before_colon + 1, suffix) == 0) {
1370                                                 interpr = cur->after_colon;
1371                                                 break;
1372                                         }
1373                                 }
1374                         }
1375 #endif
1376                         *script = '/';
1377                         /* set argv[0] to name without path */
1378                         argv[0] = (char*)bb_basename(purl);
1379                         argv[1] = NULL;
1380 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1381                         if (interpr)
1382                                 execv(interpr, argv);
1383                         else
1384 #endif
1385                                 execv(fullpath, argv);
1386                 }
1387  error_execing_cgi:
1388                 /* send to stdout
1389                  * (we are CGI here, our stdout is pumped to the net) */
1390                 send_headers_and_exit(HTTP_NOT_FOUND);
1391         } /* end child */
1392
1393         /* Parent process */
1394
1395         /* Restore variables possibly changed by child */
1396         xfunc_error_retval = 0;
1397
1398         /* Pump data */
1399         close(fromCgi.wr);
1400         close(toCgi.rd);
1401         cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1402 }
1403
1404 #endif          /* FEATURE_HTTPD_CGI */
1405
1406 /*
1407  * Send a file response to a HTTP request, and exit
1408  *
1409  * Parameters:
1410  * const char *url    The requested URL (with leading /).
1411  * headers            Don't send headers before if FALSE.
1412  */
1413 static void send_file_and_exit(const char *url, int headers)
1414 {
1415         static const char *const suffixTable[] = {
1416         /* Warning: shorter equivalent suffix in one line must be first */
1417                 ".htm.html", "text/html",
1418                 ".jpg.jpeg", "image/jpeg",
1419                 ".gif",      "image/gif",
1420                 ".png",      "image/png",
1421                 ".txt.h.c.cc.cpp", "text/plain",
1422                 ".css",      "text/css",
1423                 ".wav",      "audio/wav",
1424                 ".avi",      "video/x-msvideo",
1425                 ".qt.mov",   "video/quicktime",
1426                 ".mpe.mpeg", "video/mpeg",
1427                 ".mid.midi", "audio/midi",
1428                 ".mp3",      "audio/mpeg",
1429 #if 0                        /* unpopular */
1430                 ".au",       "audio/basic",
1431                 ".pac",      "application/x-ns-proxy-autoconfig",
1432                 ".vrml.wrl", "model/vrml",
1433 #endif
1434                 NULL
1435         };
1436
1437         char *suffix;
1438         int f;
1439         const char *const *table;
1440         const char *try_suffix;
1441         ssize_t count;
1442 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1443         off_t offset;
1444 #endif
1445
1446         suffix = strrchr(url, '.');
1447
1448         /* If not found, set default as "application/octet-stream";  */
1449         found_mime_type = "application/octet-stream";
1450         if (suffix) {
1451 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1452                 Htaccess *cur;
1453 #endif
1454                 for (table = suffixTable; *table; table += 2) {
1455                         try_suffix = strstr(table[0], suffix);
1456                         if (try_suffix) {
1457                                 try_suffix += strlen(suffix);
1458                                 if (*try_suffix == '\0' || *try_suffix == '.') {
1459                                         found_mime_type = table[1];
1460                                         break;
1461                                 }
1462                         }
1463                 }
1464 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1465                 for (cur = mime_a; cur; cur = cur->next) {
1466                         if (strcmp(cur->before_colon, suffix) == 0) {
1467                                 found_mime_type = cur->after_colon;
1468                                 break;
1469                         }
1470                 }
1471 #endif
1472         }
1473
1474         if (DEBUG)
1475                 bb_error_msg("sending file '%s' content-type: %s",
1476                         url, found_mime_type);
1477
1478         f = open(url, O_RDONLY);
1479         if (f < 0) {
1480                 if (DEBUG)
1481                         bb_perror_msg("cannot open '%s'", url);
1482                 if (headers)
1483                         send_headers_and_exit(HTTP_NOT_FOUND);
1484         }
1485 #if ENABLE_FEATURE_HTTPD_RANGES
1486         if (!headers)
1487                 range_start = 0; /* err pages and ranges don't mix */
1488         range_len = MAXINT(off_t);
1489         if (range_start) {
1490                 if (!range_end) {
1491                         range_end = file_size - 1;
1492                 }
1493                 if (range_end < range_start
1494                  || lseek(f, range_start, SEEK_SET) != range_start
1495                 ) {
1496                         lseek(f, 0, SEEK_SET);
1497                         range_start = 0;
1498                 } else {
1499                         range_len = range_end - range_start + 1;
1500                         send_headers(HTTP_PARTIAL_CONTENT);
1501                         headers = 0;
1502                 }
1503         }
1504 #endif
1505
1506         if (headers)
1507                 send_headers(HTTP_OK);
1508
1509         /* If you want to know about EPIPE below
1510          * (happens if you abort downloads from local httpd): */
1511         signal(SIGPIPE, SIG_IGN);
1512
1513 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1514         offset = range_start;
1515         do {
1516                 /* sz is rounded down to 64k */
1517                 ssize_t sz = MAXINT(ssize_t) - 0xffff;
1518                 USE_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1519                 count = sendfile(1, f, &offset, sz);
1520                 if (count < 0) {
1521                         if (offset == range_start)
1522                                 goto fallback;
1523                         goto fin;
1524                 }
1525                 USE_FEATURE_HTTPD_RANGES(range_len -= sz;)
1526         } while (count > 0 && range_len);
1527         log_and_exit();
1528
1529  fallback:
1530 #endif
1531         while ((count = safe_read(f, iobuf, IOBUF_SIZE)) > 0) {
1532                 ssize_t n;
1533                 USE_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1534                 n = full_write(1, iobuf, count);
1535                 if (count != n)
1536                         break;
1537                 USE_FEATURE_HTTPD_RANGES(range_len -= count;)
1538                 if (!range_len)
1539                         break;
1540         }
1541 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1542  fin:
1543 #endif
1544         if (count < 0 && verbose > 1)
1545                 bb_perror_msg("error");
1546         log_and_exit();
1547 }
1548
1549 static int checkPermIP(void)
1550 {
1551         Htaccess_IP *cur;
1552
1553         /* This could stand some work */
1554         for (cur = ip_a_d; cur; cur = cur->next) {
1555 #if DEBUG
1556                 fprintf(stderr,
1557                         "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1558                         rmt_ip_str,
1559                         (unsigned char)(cur->ip >> 24),
1560                         (unsigned char)(cur->ip >> 16),
1561                         (unsigned char)(cur->ip >> 8),
1562                         (unsigned char)(cur->ip),
1563                         (unsigned char)(cur->mask >> 24),
1564                         (unsigned char)(cur->mask >> 16),
1565                         (unsigned char)(cur->mask >> 8),
1566                         (unsigned char)(cur->mask)
1567                 );
1568 #endif
1569                 if ((rmt_ip & cur->mask) == cur->ip)
1570                         return cur->allow_deny == 'A';   /* Allow/Deny */
1571         }
1572
1573         /* if unconfigured, return 1 - access from all */
1574         return !flg_deny_all;
1575 }
1576
1577 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1578 /*
1579  * Check the permission file for access password protected.
1580  *
1581  * If config file isn't present, everything is allowed.
1582  * Entries are of the form you can see example from header source
1583  *
1584  * path      The file path.
1585  * request   User information to validate.
1586  *
1587  * Returns 1 if request is OK.
1588  */
1589 static int checkPerm(const char *path, const char *request)
1590 {
1591         Htaccess *cur;
1592         const char *p;
1593         const char *p0;
1594
1595         const char *prev = NULL;
1596
1597         /* This could stand some work */
1598         for (cur = g_auth; cur; cur = cur->next) {
1599                 size_t l;
1600
1601                 p0 = cur->before_colon;
1602                 if (prev != NULL && strcmp(prev, p0) != 0)
1603                         continue;       /* find next identical */
1604                 p = cur->after_colon;
1605                 if (DEBUG)
1606                         fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
1607
1608                 l = strlen(p0);
1609                 if (strncmp(p0, path, l) == 0
1610                  && (l == 1 || path[l] == '/' || path[l] == '\0')
1611                 ) {
1612                         char *u;
1613                         /* path match found.  Check request */
1614                         /* for check next /path:user:password */
1615                         prev = p0;
1616                         u = strchr(request, ':');
1617                         if (u == NULL) {
1618                                 /* bad request, ':' required */
1619                                 break;
1620                         }
1621
1622                         if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1623                                 char *cipher;
1624                                 char *pp;
1625
1626                                 if (strncmp(p, request, u - request) != 0) {
1627                                         /* user doesn't match */
1628                                         continue;
1629                                 }
1630                                 pp = strchr(p, ':');
1631                                 if (pp && pp[1] == '$' && pp[2] == '1'
1632                                  && pp[3] == '$' && pp[4]
1633                                 ) {
1634                                         pp++;
1635                                         cipher = pw_encrypt(u+1, pp);
1636                                         if (strcmp(cipher, pp) == 0)
1637                                                 goto set_remoteuser_var;   /* Ok */
1638                                         /* unauthorized */
1639                                         continue;
1640                                 }
1641                         }
1642
1643                         if (strcmp(p, request) == 0) {
1644  set_remoteuser_var:
1645                                 remoteuser = strdup(request);
1646                                 if (remoteuser)
1647                                         remoteuser[u - request] = '\0';
1648                                 return 1;   /* Ok */
1649                         }
1650                         /* unauthorized */
1651                 }
1652         } /* for */
1653
1654         return prev == NULL;
1655 }
1656 #endif  /* FEATURE_HTTPD_BASIC_AUTH */
1657
1658 /*
1659  * Handle timeouts
1660  */
1661 static void exit_on_signal(int sig) ATTRIBUTE_NORETURN;
1662 static void exit_on_signal(int sig)
1663 {
1664         send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1665 }
1666
1667 /*
1668  * Handle an incoming http request and exit.
1669  */
1670 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) ATTRIBUTE_NORETURN;
1671 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1672 {
1673         static const char request_GET[] ALIGN1 = "GET";
1674
1675         struct stat sb;
1676         char *urlcopy;
1677         char *urlp;
1678         char *tptr;
1679         int http_major_version;
1680         int ip_allowed;
1681 #if ENABLE_FEATURE_HTTPD_CGI
1682         const char *prequest;
1683         unsigned long length = 0;
1684         char *cookie = 0;
1685         char *content_type = 0;
1686 #endif
1687         struct sigaction sa;
1688 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1689         int credentials = -1;  /* if not required this is Ok */
1690 #endif
1691
1692         /* Allocation of iobuf is postponed until now
1693          * (IOW, server process doesn't need to waste 8k) */
1694         iobuf = xmalloc(IOBUF_SIZE);
1695
1696         rmt_ip = 0;
1697         if (fromAddr->sa.sa_family == AF_INET) {
1698                 rmt_ip = ntohl(fromAddr->sin.sin_addr.s_addr);
1699         }
1700 #if ENABLE_FEATURE_IPV6
1701         if (fromAddr->sa.sa_family == AF_INET6
1702          && fromAddr->sin6.sin6_addr.s6_addr32[0] == 0
1703          && fromAddr->sin6.sin6_addr.s6_addr32[1] == 0
1704          && ntohl(fromAddr->sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1705                 rmt_ip = ntohl(fromAddr->sin6.sin6_addr.s6_addr32[3]);
1706 #endif
1707         if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1708                 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->sa);
1709         }
1710         if (verbose) {
1711                 /* this trick makes -v logging much simpler */
1712                 applet_name = rmt_ip_str;
1713                 if (verbose > 2)
1714                         bb_error_msg("connected");
1715         }
1716
1717         /* Install timeout handler */
1718         memset(&sa, 0, sizeof(sa));
1719         sa.sa_handler = exit_on_signal;
1720         /* sigemptyset(&sa.sa_mask); - memset should be enough */
1721         /*sa.sa_flags = 0; - no SA_RESTART */
1722         sigaction(SIGALRM, &sa, NULL);
1723         alarm(HEADER_READ_TIMEOUT);
1724
1725         if (!get_line()) /* EOF or error or empty line */
1726                 send_headers_and_exit(HTTP_BAD_REQUEST);
1727
1728         /* Determine type of request (GET/POST) */
1729         urlp = strpbrk(iobuf, " \t");
1730         if (urlp == NULL)
1731                 send_headers_and_exit(HTTP_BAD_REQUEST);
1732         *urlp++ = '\0';
1733 #if ENABLE_FEATURE_HTTPD_CGI
1734         prequest = request_GET;
1735         if (strcasecmp(iobuf, prequest) != 0) {
1736                 prequest = "POST";
1737                 if (strcasecmp(iobuf, prequest) != 0)
1738                         send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1739         }
1740 #else
1741         if (strcasecmp(iobuf, request_GET) != 0)
1742                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1743 #endif
1744         urlp = skip_whitespace(urlp);
1745         if (urlp[0] != '/')
1746                 send_headers_and_exit(HTTP_BAD_REQUEST);
1747
1748         /* Find end of URL and parse HTTP version, if any */
1749         http_major_version = -1;
1750         tptr = strchrnul(urlp, ' ');
1751         /* Is it " HTTP/"? */
1752         if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0)
1753                 http_major_version = (tptr[6] - '0');
1754         *tptr = '\0';
1755
1756         /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
1757         urlcopy = alloca((tptr - urlp) + sizeof("/index.html"));
1758         /*if (urlcopy == NULL)
1759          *      send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
1760         strcpy(urlcopy, urlp);
1761         /* NB: urlcopy ptr is never changed after this */
1762
1763         /* Extract url args if present */
1764         tptr = strchr(urlcopy, '?');
1765         g_query = NULL;
1766         if (tptr) {
1767                 *tptr++ = '\0';
1768                 g_query = tptr;
1769         }
1770
1771         /* Decode URL escape sequences */
1772         tptr = decodeString(urlcopy, 0);
1773         if (tptr == NULL)
1774                 send_headers_and_exit(HTTP_BAD_REQUEST);
1775         if (tptr == urlcopy + 1) {
1776                 /* '/' or NUL is encoded */
1777                 send_headers_and_exit(HTTP_NOT_FOUND);
1778         }
1779
1780         /* Canonicalize path */
1781         /* Algorithm stolen from libbb bb_simplify_path(),
1782          * but don't strdup and reducing trailing slash and protect out root */
1783         urlp = tptr = urlcopy;
1784         do {
1785                 if (*urlp == '/') {
1786                         /* skip duplicate (or initial) slash */
1787                         if (*tptr == '/') {
1788                                 continue;
1789                         }
1790                         if (*tptr == '.') {
1791                                 /* skip extra '.' */
1792                                 if (tptr[1] == '/' || !tptr[1]) {
1793                                         continue;
1794                                 }
1795                                 /* '..': be careful */
1796                                 if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
1797                                         ++tptr;
1798                                         if (urlp == urlcopy) /* protect root */
1799                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
1800                                         while (*--urlp != '/') /* omit previous dir */;
1801                                                 continue;
1802                                 }
1803                         }
1804                 }
1805                 *++urlp = *tptr;
1806         } while (*++tptr);
1807         *++urlp = '\0';       /* so keep last character */
1808         tptr = urlp;          /* end ptr */
1809
1810         /* If URL is a directory, add '/' */
1811         if (tptr[-1] != '/') {
1812                 if (is_directory(urlcopy + 1, 1, &sb)) {
1813                         found_moved_temporarily = urlcopy;
1814                 }
1815         }
1816
1817         /* Log it */
1818         if (verbose > 1)
1819                 bb_error_msg("url:%s", urlcopy);
1820
1821         tptr = urlcopy;
1822         ip_allowed = checkPermIP();
1823         while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
1824                 /* have path1/path2 */
1825                 *tptr = '\0';
1826                 if (is_directory(urlcopy + 1, 1, &sb)) {
1827                         /* may be having subdir config */
1828                         parse_conf(urlcopy + 1, SUBDIR_PARSE);
1829                         ip_allowed = checkPermIP();
1830                 }
1831                 *tptr = '/';
1832         }
1833         if (http_major_version >= 0) {
1834                 /* Request was with "... HTTP/nXXX", and n >= 0 */
1835
1836                 /* Read until blank line for HTTP version specified, else parse immediate */
1837                 while (1) {
1838                         alarm(HEADER_READ_TIMEOUT);
1839                         if (!get_line())
1840                                 break; /* EOF or error or empty line */
1841                         if (DEBUG)
1842                                 bb_error_msg("header: '%s'", iobuf);
1843
1844 #if ENABLE_FEATURE_HTTPD_CGI
1845                         /* try and do our best to parse more lines */
1846                         if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
1847                                 /* extra read only for POST */
1848                                 if (prequest != request_GET) {
1849                                         tptr = iobuf + sizeof("Content-length:") - 1;
1850                                         if (!tptr[0])
1851                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
1852                                         errno = 0;
1853                                         /* not using strtoul: it ignores leading minus! */
1854                                         length = strtol(tptr, &tptr, 10);
1855                                         /* length is "ulong", but we need to pass it to int later */
1856                                         /* so we check for negative or too large values in one go: */
1857                                         /* (long -> ulong conv caused negatives to be seen as > INT_MAX) */
1858                                         if (tptr[0] || errno || length > INT_MAX)
1859                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
1860                                 }
1861                         } else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
1862                                 cookie = strdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
1863                         } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
1864                                 content_type = strdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
1865                         } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
1866                                 referer = strdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
1867                         } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
1868                                 user_agent = strdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
1869                         }
1870 #endif
1871 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1872                         if (STRNCASECMP(iobuf, "Authorization:") == 0) {
1873                                 /* We only allow Basic credentials.
1874                                  * It shows up as "Authorization: Basic <userid:password>" where
1875                                  * the userid:password is base64 encoded.
1876                                  */
1877                                 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
1878                                 if (STRNCASECMP(tptr, "Basic") != 0)
1879                                         continue;
1880                                 tptr += sizeof("Basic")-1;
1881                                 /* decodeBase64() skips whitespace itself */
1882                                 decodeBase64(tptr);
1883                                 credentials = checkPerm(urlcopy, tptr);
1884                         }
1885 #endif          /* FEATURE_HTTPD_BASIC_AUTH */
1886 #if ENABLE_FEATURE_HTTPD_RANGES
1887                         if (STRNCASECMP(iobuf, "Range:") == 0) {
1888                                 // We know only bytes=NNN-[MMM]
1889                                 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
1890                                 if (strncmp(s, "bytes=", 6) == 0) {
1891                                         s += sizeof("bytes=")-1;
1892                                         range_start = BB_STRTOOFF(s, &s, 10);
1893                                         if (s[0] != '-' || range_start < 0) {
1894                                                 range_start = 0;
1895                                         } else if (s[1]) {
1896                                                 range_end = BB_STRTOOFF(s+1, NULL, 10);
1897                                                 if (errno || range_end < range_start)
1898                                                         range_start = 0;
1899                                         }
1900                                 }
1901                         }
1902 #endif
1903                 } /* while extra header reading */
1904         }
1905
1906         /* We read headers, disable peer timeout */
1907         alarm(0);
1908
1909         if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || ip_allowed == 0) {
1910                 /* protect listing [/path]/httpd_conf or IP deny */
1911                 send_headers_and_exit(HTTP_FORBIDDEN);
1912         }
1913
1914 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1915         if (credentials <= 0 && checkPerm(urlcopy, ":") == 0) {
1916                 send_headers_and_exit(HTTP_UNAUTHORIZED);
1917         }
1918 #endif
1919
1920         if (found_moved_temporarily) {
1921                 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
1922         }
1923
1924         tptr = urlcopy + 1;      /* skip first '/' */
1925
1926 #if ENABLE_FEATURE_HTTPD_CGI
1927         if (strncmp(tptr, "cgi-bin/", 8) == 0) {
1928                 if (tptr[8] == '\0') {
1929                         /* protect listing "cgi-bin/" */
1930                         send_headers_and_exit(HTTP_FORBIDDEN);
1931                 }
1932                 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
1933         }
1934 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1935         {
1936                 char *suffix = strrchr(tptr, '.');
1937                 if (suffix) {
1938                         Htaccess *cur;
1939                         for (cur = script_i; cur; cur = cur->next) {
1940                                 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1941                                         send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
1942                                 }
1943                         }
1944                 }
1945         }
1946 #endif
1947         if (prequest != request_GET) {
1948                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1949         }
1950 #endif  /* FEATURE_HTTPD_CGI */
1951
1952         if (urlp[-1] == '/')
1953                 strcpy(urlp, "index.html");
1954         if (stat(tptr, &sb) == 0) {
1955                 file_size = sb.st_size;
1956                 last_mod = sb.st_mtime;
1957         }
1958 #if ENABLE_FEATURE_HTTPD_CGI
1959         else if (urlp[-1] == '/') {
1960                 /* It's a dir URL and there is no index.html
1961                  * Try cgi-bin/index.cgi */
1962                 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
1963                         urlp[0] = '\0';
1964                         g_query = urlcopy;
1965                         send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
1966                 }
1967         }
1968 #endif
1969         /* else {
1970          *      fall through to send_file, it errors out if open fails
1971          * }
1972          */
1973
1974         send_file_and_exit(tptr, TRUE);
1975 }
1976
1977 /*
1978  * The main http server function.
1979  * Given a socket, listen for new connections and farm out
1980  * the processing as a [v]forked process.
1981  * Never returns.
1982  */
1983 #if BB_MMU
1984 static void mini_httpd(int server_socket) ATTRIBUTE_NORETURN;
1985 static void mini_httpd(int server_socket)
1986 {
1987         /* NB: it's best to not use xfuncs in this loop before fork().
1988          * Otherwise server may die on transient errors (temporary
1989          * out-of-memory condition, etc), which is Bad(tm).
1990          * Try to do any dangerous calls after fork.
1991          */
1992         while (1) {
1993                 int n;
1994                 len_and_sockaddr fromAddr;
1995
1996                 /* Wait for connections... */
1997                 fromAddr.len = LSA_SIZEOF_SA;
1998                 n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
1999
2000                 if (n < 0)
2001                         continue;
2002                 /* set the KEEPALIVE option to cull dead connections */
2003                 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2004
2005                 if (fork() == 0) {
2006                         /* child */
2007 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2008                         /* Do not reload config on HUP */
2009                         signal(SIGHUP, SIG_IGN);
2010 #endif
2011                         close(server_socket);
2012                         xmove_fd(n, 0);
2013                         xdup2(0, 1);
2014
2015                         handle_incoming_and_exit(&fromAddr);
2016                 }
2017                 /* parent, or fork failed */
2018                 close(n);
2019         } /* while (1) */
2020         /* never reached */
2021 }
2022 #else
2023 static void mini_httpd_nommu(int server_socket, int argc, char **argv) ATTRIBUTE_NORETURN;
2024 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2025 {
2026         char *argv_copy[argc + 2];
2027
2028         argv_copy[0] = argv[0];
2029         argv_copy[1] = (char*)"-i";
2030         memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2031
2032         /* NB: it's best to not use xfuncs in this loop before vfork().
2033          * Otherwise server may die on transient errors (temporary
2034          * out-of-memory condition, etc), which is Bad(tm).
2035          * Try to do any dangerous calls after fork.
2036          */
2037         while (1) {
2038                 int n;
2039                 len_and_sockaddr fromAddr;
2040
2041                 /* Wait for connections... */
2042                 fromAddr.len = LSA_SIZEOF_SA;
2043                 n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
2044
2045                 if (n < 0)
2046                         continue;
2047                 /* set the KEEPALIVE option to cull dead connections */
2048                 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2049
2050                 if (vfork() == 0) {
2051                         /* child */
2052 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2053                         /* Do not reload config on HUP */
2054                         signal(SIGHUP, SIG_IGN);
2055 #endif
2056                         close(server_socket);
2057                         xmove_fd(n, 0);
2058                         xdup2(0, 1);
2059
2060                         /* Run a copy of ourself in inetd mode */
2061                         re_exec(argv_copy);
2062                 }
2063                 /* parent, or vfork failed */
2064                 close(n);
2065         } /* while (1) */
2066         /* never reached */
2067 }
2068 #endif
2069
2070 /*
2071  * Process a HTTP connection on stdin/out.
2072  * Never returns.
2073  */
2074 static void mini_httpd_inetd(void) ATTRIBUTE_NORETURN;
2075 static void mini_httpd_inetd(void)
2076 {
2077         len_and_sockaddr fromAddr;
2078
2079         fromAddr.len = LSA_SIZEOF_SA;
2080         getpeername(0, &fromAddr.sa, &fromAddr.len);
2081         handle_incoming_and_exit(&fromAddr);
2082 }
2083
2084 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2085 static void sighup_handler(int sig)
2086 {
2087         struct sigaction sa;
2088
2089         parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
2090
2091         memset(&sa, 0, sizeof(sa));
2092         sa.sa_handler = sighup_handler;
2093         /*sigemptyset(&sa.sa_mask); - memset should be enough */
2094         sa.sa_flags = SA_RESTART;
2095         sigaction(SIGHUP, &sa, NULL);
2096 }
2097 #endif
2098
2099 enum {
2100         c_opt_config_file = 0,
2101         d_opt_decode_url,
2102         h_opt_home_httpd,
2103         USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2104         USE_FEATURE_HTTPD_BASIC_AUTH(    r_opt_realm     ,)
2105         USE_FEATURE_HTTPD_AUTH_MD5(      m_opt_md5       ,)
2106         USE_FEATURE_HTTPD_SETUID(        u_opt_setuid    ,)
2107         p_opt_port      ,
2108         p_opt_inetd     ,
2109         p_opt_foreground,
2110         p_opt_verbose   ,
2111         OPT_CONFIG_FILE = 1 << c_opt_config_file,
2112         OPT_DECODE_URL  = 1 << d_opt_decode_url,
2113         OPT_HOME_HTTPD  = 1 << h_opt_home_httpd,
2114         OPT_ENCODE_URL  = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2115         OPT_REALM       = USE_FEATURE_HTTPD_BASIC_AUTH(    (1 << r_opt_realm     )) + 0,
2116         OPT_MD5         = USE_FEATURE_HTTPD_AUTH_MD5(      (1 << m_opt_md5       )) + 0,
2117         OPT_SETUID      = USE_FEATURE_HTTPD_SETUID(        (1 << u_opt_setuid    )) + 0,
2118         OPT_PORT        = 1 << p_opt_port,
2119         OPT_INETD       = 1 << p_opt_inetd,
2120         OPT_FOREGROUND  = 1 << p_opt_foreground,
2121         OPT_VERBOSE     = 1 << p_opt_verbose,
2122 };
2123
2124
2125 int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2126 int httpd_main(int argc, char **argv)
2127 {
2128         int server_socket = server_socket; /* for gcc */
2129         unsigned opt;
2130         char *url_for_decode;
2131         USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2132         USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2133         USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2134         USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2135
2136         INIT_G();
2137
2138 #if ENABLE_LOCALE_SUPPORT
2139         /* Undo busybox.c: we want to speak English in http (dates etc) */
2140         setlocale(LC_TIME, "C");
2141 #endif
2142
2143         home_httpd = xrealloc_getcwd_or_warn(NULL);
2144         /* -v counts, -i implies -f */
2145         opt_complementary = "vv:if";
2146         /* We do not "absolutize" path given by -h (home) opt.
2147          * If user gives relative path in -h, $SCRIPT_FILENAME can end up
2148          * relative too. */
2149         opt = getopt32(argv, "c:d:h:"
2150                         USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2151                         USE_FEATURE_HTTPD_BASIC_AUTH("r:")
2152                         USE_FEATURE_HTTPD_AUTH_MD5("m:")
2153                         USE_FEATURE_HTTPD_SETUID("u:")
2154                         "p:ifv",
2155                         &configFile, &url_for_decode, &home_httpd
2156                         USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2157                         USE_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2158                         USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
2159                         USE_FEATURE_HTTPD_SETUID(, &s_ugid)
2160                         , &bind_addr_or_port
2161                         , &verbose
2162                 );
2163         if (opt & OPT_DECODE_URL) {
2164                 fputs(decodeString(url_for_decode, 1), stdout);
2165                 return 0;
2166         }
2167 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2168         if (opt & OPT_ENCODE_URL) {
2169                 fputs(encodeString(url_for_encode), stdout);
2170                 return 0;
2171         }
2172 #endif
2173 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2174         if (opt & OPT_MD5) {
2175                 puts(pw_encrypt(pass, "$1$"));
2176                 return 0;
2177         }
2178 #endif
2179 #if ENABLE_FEATURE_HTTPD_SETUID
2180         if (opt & OPT_SETUID) {
2181                 if (!get_uidgid(&ugid, s_ugid, 1))
2182                         bb_error_msg_and_die("unrecognized user[:group] "
2183                                                 "name '%s'", s_ugid);
2184         }
2185 #endif
2186
2187 #if !BB_MMU
2188         if (!(opt & OPT_FOREGROUND)) {
2189                 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2190         }
2191 #endif
2192
2193         xchdir(home_httpd);
2194         if (!(opt & OPT_INETD)) {
2195                 signal(SIGCHLD, SIG_IGN);
2196                 server_socket = openServer();
2197 #if ENABLE_FEATURE_HTTPD_SETUID
2198                 /* drop privileges */
2199                 if (opt & OPT_SETUID) {
2200                         if (ugid.gid != (gid_t)-1) {
2201                                 if (setgroups(1, &ugid.gid) == -1)
2202                                         bb_perror_msg_and_die("setgroups");
2203                                 xsetgid(ugid.gid);
2204                         }
2205                         xsetuid(ugid.uid);
2206                 }
2207 #endif
2208         }
2209
2210 #if 0 /*was #if ENABLE_FEATURE_HTTPD_CGI*/
2211         /* User can do it himself: 'env - PATH="$PATH" httpd'
2212          * We don't do it because we don't want to screw users
2213          * which want to do
2214          * 'env - VAR1=val1 VAR2=val2 https'
2215          * and have VAR1 and VAR2 values visible in their CGIs.
2216          * Besides, it is also smaller. */
2217         {
2218                 char *p = getenv("PATH");
2219                 /* env strings themself are not freed, no need to strdup(p): */
2220                 clearenv();
2221                 if (p)
2222                         putenv(p - 5);
2223 //              if (!(opt & OPT_INETD))
2224 //                      setenv_long("SERVER_PORT", ???);
2225         }
2226 #endif
2227
2228 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2229         if (!(opt & OPT_INETD))
2230                 sighup_handler(0);
2231         else /* do not install HUP handler in inetd mode */
2232 #endif
2233                 parse_conf(default_path_httpd_conf, FIRST_PARSE);
2234
2235         xfunc_error_retval = 0;
2236         if (opt & OPT_INETD)
2237                 mini_httpd_inetd();
2238 #if BB_MMU
2239         if (!(opt & OPT_FOREGROUND))
2240                 bb_daemonize(0); /* don't change current directory */
2241         mini_httpd(server_socket); /* never returns */
2242 #else
2243         mini_httpd_nommu(server_socket, argc, argv); /* never returns */
2244 #endif
2245         /* return 0; */
2246 }