httpd: small auth and IPv6 fixes (Kim B. Heino <Kim.Heino@bluegiga.com>)
[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_perror_msg_and_die("%s", 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                                         } else if (*cf == '.') {
613                                                 if (cf[1] == '/' || cf[1] == '\0') { /* remove extra '.' */
614                                                         continue;
615                                                 } else if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == '\0')) {
616                                                         ++cf;
617                                                         if (p > p0) {
618                                                                 while (*--p != '/') /* omit previous dir */;
619                                                         }
620                                                         continue;
621                                                 }
622                                         }
623                                 }
624                                 *++p = *cf;
625                         } while (*++cf);
626
627                         if ((p == p0) || (*p != '/')) {      /* not a trailing slash */
628                                 ++p;                             /* so keep last character */
629                         }
630                         *p = '\0';
631                         sprintf(p0 + strlen(p0), ":%s", c);
632                 }
633 #endif
634
635 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
636  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
637  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
638                 /* storing current config line */
639                 cur = xzalloc(sizeof(Htaccess) + strlen(p0));
640                 if (cur) {
641                         cf = strcpy(cur->before_colon, p0);
642                         c = strchr(cf, ':');
643                         *c++ = 0;
644                         cur->after_colon = c;
645 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
646                         if (*cf == '.') {
647                                 /* config .mime line move top for overwrite previous */
648                                 cur->next = mime_a;
649                                 mime_a = cur;
650                                 continue;
651                         }
652 #endif
653 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
654                         if (*cf == '*' && cf[1] == '.') {
655                                 /* config script interpreter line move top for overwrite previous */
656                                 cur->next = script_i;
657                                 script_i = cur;
658                                 continue;
659                         }
660 #endif
661 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
662                         free(p0);
663                         if (prev == NULL) {
664                                 /* first line */
665                                 g_auth = prev = cur;
666                         } else {
667                                 /* sort path, if current lenght eq or bigger then move up */
668                                 Htaccess *prev_hti = g_auth;
669                                 size_t l = strlen(cf);
670                                 Htaccess *hti;
671
672                                 for (hti = prev_hti; hti; hti = hti->next) {
673                                         if (l >= strlen(hti->before_colon)) {
674                                                 /* insert before hti */
675                                                 cur->next = hti;
676                                                 if (prev_hti != hti) {
677                                                         prev_hti->next = cur;
678                                                 } else {
679                                                         /* insert as top */
680                                                         g_auth = cur;
681                                                 }
682                                                 break;
683                                         }
684                                         if (prev_hti != hti)
685                                                 prev_hti = prev_hti->next;
686                                 }
687                                 if (!hti) {       /* not inserted, add to bottom */
688                                         prev->next = cur;
689                                         prev = cur;
690                                 }
691                         }
692 #endif
693                 }
694 #endif
695          }
696          fclose(f);
697 }
698
699 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
700 /*
701  * Given a string, html-encode special characters.
702  * This is used for the -e command line option to provide an easy way
703  * for scripts to encode result data without confusing browsers.  The
704  * returned string pointer is memory allocated by malloc().
705  *
706  * Returns a pointer to the encoded string (malloced).
707  */
708 static char *encodeString(const char *string)
709 {
710         /* take the simple route and encode everything */
711         /* could possibly scan once to get length.     */
712         int len = strlen(string);
713         char *out = xmalloc(len * 6 + 1);
714         char *p = out;
715         char ch;
716
717         while ((ch = *string++)) {
718                 /* very simple check for what to encode */
719                 if (isalnum(ch))
720                         *p++ = ch;
721                 else
722                         p += sprintf(p, "&#%d;", (unsigned char) ch);
723         }
724         *p = '\0';
725         return out;
726 }
727 #endif          /* FEATURE_HTTPD_ENCODE_URL_STR */
728
729 /*
730  * Given a URL encoded string, convert it to plain ascii.
731  * Since decoding always makes strings smaller, the decode is done in-place.
732  * Thus, callers should strdup() the argument if they do not want the
733  * argument modified.  The return is the original pointer, allowing this
734  * function to be easily used as arguments to other functions.
735  *
736  * string    The first string to decode.
737  * option_d  1 if called for httpd -d
738  *
739  * Returns a pointer to the decoded string (same as input).
740  */
741 static unsigned hex_to_bin(unsigned char c)
742 {
743         unsigned v;
744
745         v = c - '0';
746         if (v <= 9)
747                 return v;
748         /* c | 0x20: letters to lower case, non-letters
749          * to (potentially different) non-letters */
750         v = (unsigned)(c | 0x20) - 'a';
751         if (v <= 5)
752                 return v + 10;
753         return ~0;
754 }
755 /* For testing:
756 void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
757 int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
758 t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
759 */
760 static char *decodeString(char *orig, int option_d)
761 {
762         /* note that decoded string is always shorter than original */
763         char *string = orig;
764         char *ptr = string;
765         char c;
766
767         while ((c = *ptr++) != '\0') {
768                 unsigned v;
769
770                 if (option_d && c == '+') {
771                         *string++ = ' ';
772                         continue;
773                 }
774                 if (c != '%') {
775                         *string++ = c;
776                         continue;
777                 }
778                 v = hex_to_bin(ptr[0]);
779                 if (v > 15) {
780  bad_hex:
781                         if (!option_d)
782                                 return NULL;
783                         *string++ = '%';
784                         continue;
785                 }
786                 v = (v * 16) | hex_to_bin(ptr[1]);
787                 if (v > 255)
788                         goto bad_hex;
789                 if (!option_d && (v == '/' || v == '\0')) {
790                         /* caller takes it as indication of invalid
791                          * (dangerous wrt exploits) chars */
792                         return orig + 1;
793                 }
794                 *string++ = v;
795                 ptr += 2;
796         }
797         *string = '\0';
798         return orig;
799 }
800
801 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
802 /*
803  * Decode a base64 data stream as per rfc1521.
804  * Note that the rfc states that non base64 chars are to be ignored.
805  * Since the decode always results in a shorter size than the input,
806  * it is OK to pass the input arg as an output arg.
807  * Parameter: a pointer to a base64 encoded string.
808  * Decoded data is stored in-place.
809  */
810 static void decodeBase64(char *Data)
811 {
812         const unsigned char *in = (const unsigned char *)Data;
813         /* The decoded size will be at most 3/4 the size of the encoded */
814         unsigned ch = 0;
815         int i = 0;
816
817         while (*in) {
818                 int t = *in++;
819
820                 if (t >= '0' && t <= '9')
821                         t = t - '0' + 52;
822                 else if (t >= 'A' && t <= 'Z')
823                         t = t - 'A';
824                 else if (t >= 'a' && t <= 'z')
825                         t = t - 'a' + 26;
826                 else if (t == '+')
827                         t = 62;
828                 else if (t == '/')
829                         t = 63;
830                 else if (t == '=')
831                         t = 0;
832                 else
833                         continue;
834
835                 ch = (ch << 6) | t;
836                 i++;
837                 if (i == 4) {
838                         *Data++ = (char) (ch >> 16);
839                         *Data++ = (char) (ch >> 8);
840                         *Data++ = (char) ch;
841                         i = 0;
842                 }
843         }
844         *Data = '\0';
845 }
846 #endif
847
848 /*
849  * Create a listen server socket on the designated port.
850  */
851 static int openServer(void)
852 {
853         int n = bb_strtou(bind_addr_or_port, NULL, 10);
854         if (!errno && n && n <= 0xffff)
855                 n = create_and_bind_stream_or_die(NULL, n);
856         else
857                 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
858         xlisten(n, 9);
859         return n;
860 }
861
862 /*
863  * Log the connection closure and exit.
864  */
865 static void log_and_exit(void) ATTRIBUTE_NORETURN;
866 static void log_and_exit(void)
867 {
868         /* Paranoia. IE said to be buggy. It may send some extra data
869          * or be confused by us just exiting without SHUT_WR. Oh well. */
870         shutdown(1, SHUT_WR);
871         ndelay_on(0);
872         while (read(0, iobuf, IOBUF_SIZE) > 0)
873                 continue;
874
875         if (verbose > 2)
876                 bb_error_msg("closed");
877         _exit(xfunc_error_retval);
878 }
879
880 /*
881  * Create and send HTTP response headers.
882  * The arguments are combined and sent as one write operation.  Note that
883  * IE will puke big-time if the headers are not sent in one packet and the
884  * second packet is delayed for any reason.
885  * responseNum - the result code to send.
886  */
887 static void send_headers(int responseNum)
888 {
889         static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
890
891         const char *responseString = "";
892         const char *infoString = NULL;
893         const char *mime_type;
894 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
895         const char *error_page = 0;
896 #endif
897         unsigned i;
898         time_t timer = time(0);
899         char tmp_str[80];
900         int len;
901
902         for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
903                 if (http_response_type[i] == responseNum) {
904                         responseString = http_response[i].name;
905                         infoString = http_response[i].info;
906 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
907                         error_page = http_error_page[i];
908 #endif
909                         break;
910                 }
911         }
912         /* error message is HTML */
913         mime_type = responseNum == HTTP_OK ?
914                                 found_mime_type : "text/html";
915
916         if (verbose)
917                 bb_error_msg("response:%u", responseNum);
918
919         /* emit the current date */
920         strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
921         len = sprintf(iobuf,
922                         "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
923                         "Date: %s\r\nConnection: close\r\n",
924                         responseNum, responseString, mime_type, tmp_str);
925
926 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
927         if (responseNum == HTTP_UNAUTHORIZED) {
928                 len += sprintf(iobuf + len,
929                                 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
930                                 g_realm);
931         }
932 #endif
933         if (responseNum == HTTP_MOVED_TEMPORARILY) {
934                 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
935                                 found_moved_temporarily,
936                                 (g_query ? "?" : ""),
937                                 (g_query ? g_query : ""));
938         }
939
940 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
941         if (error_page && !access(error_page, R_OK)) {
942                 strcat(iobuf, "\r\n");
943                 len += 2;
944
945                 if (DEBUG)
946                         fprintf(stderr, "headers: '%s'\n", iobuf);
947                 full_write(1, iobuf, len);
948                 if (DEBUG)
949                         fprintf(stderr, "writing error page: '%s'\n", error_page);
950                 return send_file_and_exit(error_page, FALSE);
951         }
952 #endif
953
954         if (file_size != -1) {    /* file */
955                 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
956 #if ENABLE_FEATURE_HTTPD_RANGES
957                 if (responseNum == HTTP_PARTIAL_CONTENT) {
958                         len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n",
959                                         range_start,
960                                         range_end,
961                                         file_size);
962                         file_size = range_end - range_start + 1;
963                 }
964 #endif
965                 len += sprintf(iobuf + len,
966 #if ENABLE_FEATURE_HTTPD_RANGES
967                         "Accept-Ranges: bytes\r\n"
968 #endif
969                         "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
970                                 tmp_str,
971                                 "Content-length:",
972                                 file_size
973                 );
974         }
975         iobuf[len++] = '\r';
976         iobuf[len++] = '\n';
977         if (infoString) {
978                 len += sprintf(iobuf + len,
979                                 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
980                                 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
981                                 responseNum, responseString,
982                                 responseNum, responseString, infoString);
983         }
984         if (DEBUG)
985                 fprintf(stderr, "headers: '%s'\n", iobuf);
986         if (full_write(1, iobuf, len) != len) {
987                 if (verbose > 1)
988                         bb_perror_msg("error");
989                 log_and_exit();
990         }
991 }
992
993 static void send_headers_and_exit(int responseNum) ATTRIBUTE_NORETURN;
994 static void send_headers_and_exit(int responseNum)
995 {
996         send_headers(responseNum);
997         log_and_exit();
998 }
999
1000 /*
1001  * Read from the socket until '\n' or EOF. '\r' chars are removed.
1002  * '\n' is replaced with NUL.
1003  * Return number of characters read or 0 if nothing is read
1004  * ('\r' and '\n' are not counted).
1005  * Data is returned in iobuf.
1006  */
1007 static int get_line(void)
1008 {
1009         int count = 0;
1010         char c;
1011
1012         while (1) {
1013                 if (hdr_cnt <= 0) {
1014                         hdr_cnt = safe_read(0, hdr_buf, sizeof(hdr_buf));
1015                         if (hdr_cnt <= 0)
1016                                 break;
1017                         hdr_ptr = hdr_buf;
1018                 }
1019                 iobuf[count] = c = *hdr_ptr++;
1020                 hdr_cnt--;
1021
1022                 if (c == '\r')
1023                         continue;
1024                 if (c == '\n') {
1025                         iobuf[count] = '\0';
1026                         return count;
1027                 }
1028                 if (count < (IOBUF_SIZE - 1))      /* check overflow */
1029                         count++;
1030         }
1031         return count;
1032 }
1033
1034 #if ENABLE_FEATURE_HTTPD_CGI
1035
1036 /* gcc 4.2.1 fares better with NOINLINE */
1037 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) ATTRIBUTE_NORETURN;
1038 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1039 {
1040         enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1041         struct pollfd pfd[3];
1042         int out_cnt; /* we buffer a bit of initial CGI output */
1043         int count;
1044
1045         /* iobuf is used for CGI -> network data,
1046          * hdr_buf is for network -> CGI data (POSTDATA) */
1047
1048         /* If CGI dies, we still want to correctly finish reading its output
1049          * and send it to the peer. So please no SIGPIPEs! */
1050         signal(SIGPIPE, SIG_IGN);
1051
1052         /* NB: breaking out of this loop jumps to log_and_exit() */
1053         out_cnt = 0;
1054         while (1) {
1055                 memset(pfd, 0, sizeof(pfd));
1056
1057                 pfd[FROM_CGI].fd = fromCgi_rd;
1058                 pfd[FROM_CGI].events = POLLIN;
1059
1060                 if (toCgi_wr) {
1061                         pfd[TO_CGI].fd = toCgi_wr;
1062                         if (hdr_cnt > 0) {
1063                                 pfd[TO_CGI].events = POLLOUT;
1064                         } else if (post_len > 0) {
1065                                 pfd[0].events = POLLIN;
1066                         } else {
1067                                 /* post_len <= 0 && hdr_cnt <= 0:
1068                                  * no more POST data to CGI,
1069                                  * let CGI see EOF on CGI's stdin */
1070                                 close(toCgi_wr);
1071                                 toCgi_wr = 0;
1072                         }
1073                 }
1074
1075                 /* Now wait on the set of sockets */
1076                 count = poll(pfd, 3, -1);
1077                 if (count <= 0) {
1078 #if 0
1079                         if (errno == EINTR)
1080                                 continue;
1081 #endif
1082 #if 0
1083                         if (waitpid(pid, &status, WNOHANG) <= 0) {
1084                                 /* Weird. CGI didn't exit and no fd's
1085                                  * are ready, yet poll returned?! */
1086                                 continue;
1087                         }
1088                         if (DEBUG && WIFEXITED(status))
1089                                 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1090                         if (DEBUG && WIFSIGNALED(status))
1091                                 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1092 #endif
1093                         break;
1094                 }
1095
1096                 if (pfd[TO_CGI].revents) {
1097                         /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */
1098                         /* Have data from peer and can write to CGI */
1099                         count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1100                         /* Doesn't happen, we dont use nonblocking IO here
1101                          *if (count < 0 && errno == EAGAIN) {
1102                          *      ...
1103                          *} else */
1104                         if (count > 0) {
1105                                 hdr_ptr += count;
1106                                 hdr_cnt -= count;
1107                         } else {
1108                                 /* EOF/broken pipe to CGI, stop piping POST data */
1109                                 hdr_cnt = post_len = 0;
1110                         }
1111                 }
1112
1113                 if (pfd[0].revents) {
1114                         /* post_len > 0 && hdr_cnt == 0 here */
1115                         /* We expect data, prev data portion is eaten by CGI
1116                          * and there *is* data to read from the peer
1117                          * (POSTDATA) */
1118                         //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
1119                         //count = safe_read(0, hdr_buf, count);
1120                         count = safe_read(0, hdr_buf, sizeof(hdr_buf));
1121                         if (count > 0) {
1122                                 hdr_cnt = count;
1123                                 hdr_ptr = hdr_buf;
1124                                 post_len -= count;
1125                         } else {
1126                                 /* no more POST data can be read */
1127                                 post_len = 0;
1128                         }
1129                 }
1130
1131                 if (pfd[FROM_CGI].revents) {
1132                         /* There is something to read from CGI */
1133                         char *rbuf = iobuf;
1134
1135                         /* Are we still buffering CGI output? */
1136                         if (out_cnt >= 0) {
1137                                 /* HTTP_200[] has single "\r\n" at the end.
1138                                  * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1139                                  * CGI scripts MUST send their own header terminated by
1140                                  * empty line, then data. That's why we have only one
1141                                  * <cr><lf> pair here. We will output "200 OK" line
1142                                  * if needed, but CGI still has to provide blank line
1143                                  * between header and body */
1144
1145                                 /* Must use safe_read, not full_read, because
1146                                  * CGI may output a few first bytes and then wait
1147                                  * for POSTDATA without closing stdout.
1148                                  * With full_read we may wait here forever. */
1149                                 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1150                                 if (count <= 0) {
1151                                         /* eof (or error) and there was no "HTTP",
1152                                          * so write it, then write received data */
1153                                         if (out_cnt) {
1154                                                 full_write(1, HTTP_200, sizeof(HTTP_200)-1);
1155                                                 full_write(1, rbuf, out_cnt);
1156                                         }
1157                                         break; /* CGI stdout is closed, exiting */
1158                                 }
1159                                 out_cnt += count;
1160                                 count = 0;
1161                                 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1162                                 if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1163                                         /* send "HTTP/1.0 " */
1164                                         if (full_write(1, HTTP_200, 9) != 9)
1165                                                 break;
1166                                         rbuf += 8; /* skip "Status: " */
1167                                         count = out_cnt - 8;
1168                                         out_cnt = -1; /* buffering off */
1169                                 } else if (out_cnt >= 4) {
1170                                         /* Did CGI add "HTTP"? */
1171                                         if (memcmp(rbuf, HTTP_200, 4) != 0) {
1172                                                 /* there is no "HTTP", do it ourself */
1173                                                 if (full_write(1, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1174                                                         break;
1175                                         }
1176                                         /* Commented out:
1177                                         if (!strstr(rbuf, "ontent-")) {
1178                                                 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1179                                         }
1180                                          * Counter-example of valid CGI without Content-type:
1181                                          * echo -en "HTTP/1.0 302 Found\r\n"
1182                                          * echo -en "Location: http://www.busybox.net\r\n"
1183                                          * echo -en "\r\n"
1184                                          */
1185                                         count = out_cnt;
1186                                         out_cnt = -1; /* buffering off */
1187                                 }
1188                         } else {
1189                                 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1190                                 if (count <= 0)
1191                                         break;  /* eof (or error) */
1192                         }
1193                         if (full_write(1, rbuf, count) != count)
1194                                 break;
1195                         if (DEBUG)
1196                                 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1197                 } /* if (pfd[FROM_CGI].revents) */
1198         } /* while (1) */
1199         log_and_exit();
1200 }
1201
1202 static void setenv1(const char *name, const char *value)
1203 {
1204         setenv(name, value ? value : "", 1);
1205 }
1206
1207 /*
1208  * Spawn CGI script, forward CGI's stdin/out <=> network
1209  *
1210  * Environment variables are set up and the script is invoked with pipes
1211  * for stdin/stdout.  If a POST is being done the script is fed the POST
1212  * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1213  *
1214  * Parameters:
1215  * const char *url              The requested URL (with leading /).
1216  * int post_len                 Length of the POST body.
1217  * const char *cookie           For set HTTP_COOKIE.
1218  * const char *content_type     For set CONTENT_TYPE.
1219  */
1220 static void send_cgi_and_exit(
1221                 const char *url,
1222                 const char *request,
1223                 int post_len,
1224                 const char *cookie,
1225                 const char *content_type) ATTRIBUTE_NORETURN;
1226 static void send_cgi_and_exit(
1227                 const char *url,
1228                 const char *request,
1229                 int post_len,
1230                 const char *cookie,
1231                 const char *content_type)
1232 {
1233         struct { int rd; int wr; } fromCgi;  /* CGI -> httpd pipe */
1234         struct { int rd; int wr; } toCgi;    /* httpd -> CGI pipe */
1235         char *fullpath;
1236         char *script;
1237         char *purl;
1238         int pid;
1239
1240         /*
1241          * We are mucking with environment _first_ and then vfork/exec,
1242          * this allows us to use vfork safely. Parent don't care about
1243          * these environment changes anyway.
1244          */
1245
1246         /*
1247          * Find PATH_INFO.
1248          */
1249         purl = xstrdup(url);
1250         script = purl;
1251         while ((script = strchr(script + 1, '/')) != NULL) {
1252                 /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
1253                 struct stat sb;
1254
1255                 *script = '\0';
1256                 if (!is_directory(purl + 1, 1, &sb)) {
1257                         /* not directory, found script.cgi/PATH_INFO */
1258                         *script = '/';
1259                         break;
1260                 }
1261                 *script = '/';          /* is directory, find next '/' */
1262         }
1263         setenv1("PATH_INFO", script);   /* set /PATH_INFO or "" */
1264         setenv1("REQUEST_METHOD", request);
1265         if (g_query) {
1266                 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", purl, g_query));
1267         } else {
1268                 setenv1("REQUEST_URI", purl);
1269         }
1270         if (script != NULL)
1271                 *script = '\0';         /* cut off /PATH_INFO */
1272
1273         /* SCRIPT_FILENAME required by PHP in CGI mode */
1274         fullpath = concat_path_file(home_httpd, purl);
1275         setenv1("SCRIPT_FILENAME", fullpath);
1276         /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1277         setenv1("SCRIPT_NAME", purl);
1278         /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1279          * QUERY_STRING: The information which follows the ? in the URL
1280          * which referenced this script. This is the query information.
1281          * It should not be decoded in any fashion. This variable
1282          * should always be set when there is query information,
1283          * regardless of command line decoding. */
1284         /* (Older versions of bbox seem to do some decoding) */
1285         setenv1("QUERY_STRING", g_query);
1286         putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1287         putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1288         putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1289         /* Having _separate_ variables for IP and port defeats
1290          * the purpose of having socket abstraction. Which "port"
1291          * are you using on Unix domain socket?
1292          * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1293          * Oh well... */
1294         {
1295                 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1296                 char *cp = strrchr(p, ':');
1297                 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1298                         cp = NULL;
1299                 if (cp) *cp = '\0'; /* delete :PORT */
1300                 setenv1("REMOTE_ADDR", p);
1301                 if (cp) {
1302                         *cp = ':';
1303 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1304                         setenv1("REMOTE_PORT", cp + 1);
1305 #endif
1306                 }
1307         }
1308         setenv1("HTTP_USER_AGENT", user_agent);
1309         if (post_len)
1310                 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1311         if (cookie)
1312                 setenv1("HTTP_COOKIE", cookie);
1313         if (content_type)
1314                 setenv1("CONTENT_TYPE", content_type);
1315 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1316         if (remoteuser) {
1317                 setenv1("REMOTE_USER", remoteuser);
1318                 putenv((char*)"AUTH_TYPE=Basic");
1319         }
1320 #endif
1321         if (referer)
1322                 setenv1("HTTP_REFERER", referer);
1323
1324         xpipe(&fromCgi.rd);
1325         xpipe(&toCgi.rd);
1326
1327         pid = vfork();
1328         if (pid < 0) {
1329                 /* TODO: log perror? */
1330                 log_and_exit();
1331         }
1332
1333         if (!pid) {
1334                 /* Child process */
1335                 xfunc_error_retval = 242;
1336
1337                 xmove_fd(toCgi.rd, 0);  /* replace stdin with the pipe */
1338                 xmove_fd(fromCgi.wr, 1);  /* replace stdout with the pipe */
1339                 close(fromCgi.rd);
1340                 close(toCgi.wr);
1341                 /* User seeing stderr output can be a security problem.
1342                  * If CGI really wants that, it can always do dup itself. */
1343                 /* dup2(1, 2); */
1344
1345                 /* script must have absolute path */
1346                 script = strrchr(fullpath, '/');
1347                 if (!script)
1348                         goto error_execing_cgi;
1349                 *script = '\0';
1350                 /* chdiring to script's dir */
1351                 if (chdir(fullpath) == 0) {
1352                         char *argv[2];
1353 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1354                         char *interpr = NULL;
1355                         char *suffix = strrchr(purl, '.');
1356
1357                         if (suffix) {
1358                                 Htaccess *cur;
1359                                 for (cur = script_i; cur; cur = cur->next) {
1360                                         if (strcmp(cur->before_colon + 1, suffix) == 0) {
1361                                                 interpr = cur->after_colon;
1362                                                 break;
1363                                         }
1364                                 }
1365                         }
1366 #endif
1367                         *script = '/';
1368                         /* set argv[0] to name without path */
1369                         argv[0] = (char*)bb_basename(purl);
1370                         argv[1] = NULL;
1371 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1372                         if (interpr)
1373                                 execv(interpr, argv);
1374                         else
1375 #endif
1376                                 execv(fullpath, argv);
1377                 }
1378  error_execing_cgi:
1379                 /* send to stdout
1380                  * (we are CGI here, our stdout is pumped to the net) */
1381                 send_headers_and_exit(HTTP_NOT_FOUND);
1382         } /* end child */
1383
1384         /* Parent process */
1385
1386         /* Restore variables possibly changed by child */
1387         xfunc_error_retval = 0;
1388
1389         /* Pump data */
1390         close(fromCgi.wr);
1391         close(toCgi.rd);
1392         cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1393 }
1394
1395 #endif          /* FEATURE_HTTPD_CGI */
1396
1397 /*
1398  * Send a file response to a HTTP request, and exit
1399  * 
1400  * Parameters:
1401  * const char *url    The requested URL (with leading /).
1402  * headers            Don't send headers before if FALSE.
1403  */
1404 static void send_file_and_exit(const char *url, int headers)
1405 {
1406         static const char *const suffixTable[] = {
1407         /* Warning: shorter equivalent suffix in one line must be first */
1408                 ".htm.html", "text/html",
1409                 ".jpg.jpeg", "image/jpeg",
1410                 ".gif",      "image/gif",
1411                 ".png",      "image/png",
1412                 ".txt.h.c.cc.cpp", "text/plain",
1413                 ".css",      "text/css",
1414                 ".wav",      "audio/wav",
1415                 ".avi",      "video/x-msvideo",
1416                 ".qt.mov",   "video/quicktime",
1417                 ".mpe.mpeg", "video/mpeg",
1418                 ".mid.midi", "audio/midi",
1419                 ".mp3",      "audio/mpeg",
1420 #if 0                        /* unpopular */
1421                 ".au",       "audio/basic",
1422                 ".pac",      "application/x-ns-proxy-autoconfig",
1423                 ".vrml.wrl", "model/vrml",
1424 #endif
1425                 NULL
1426         };
1427
1428         char *suffix;
1429         int f;
1430         const char *const *table;
1431         const char *try_suffix;
1432         ssize_t count;
1433 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1434         off_t offset;
1435 #endif
1436
1437         suffix = strrchr(url, '.');
1438
1439         /* If not found, set default as "application/octet-stream";  */
1440         found_mime_type = "application/octet-stream";
1441         if (suffix) {
1442 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1443                 Htaccess *cur;
1444 #endif
1445                 for (table = suffixTable; *table; table += 2) {
1446                         try_suffix = strstr(table[0], suffix);
1447                         if (try_suffix) {
1448                                 try_suffix += strlen(suffix);
1449                                 if (*try_suffix == '\0' || *try_suffix == '.') {
1450                                         found_mime_type = table[1];
1451                                         break;
1452                                 }
1453                         }
1454                 }
1455 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1456                 for (cur = mime_a; cur; cur = cur->next) {
1457                         if (strcmp(cur->before_colon, suffix) == 0) {
1458                                 found_mime_type = cur->after_colon;
1459                                 break;
1460                         }
1461                 }
1462 #endif
1463         }
1464
1465         if (DEBUG)
1466                 bb_error_msg("sending file '%s' content-type: %s",
1467                         url, found_mime_type);
1468
1469         f = open(url, O_RDONLY);
1470         if (f < 0) {
1471                 if (DEBUG)
1472                         bb_perror_msg("cannot open '%s'", url);
1473                 if (headers)
1474                         send_headers_and_exit(HTTP_NOT_FOUND);
1475         }
1476 #if ENABLE_FEATURE_HTTPD_RANGES
1477         if (!headers)
1478                 range_start = 0; /* err pages and ranges don't mix */
1479         range_len = MAXINT(off_t);
1480         if (range_start) {
1481                 if (!range_end) {
1482                         range_end = file_size - 1;
1483                 }
1484                 if (range_end < range_start
1485                  || lseek(f, range_start, SEEK_SET) != range_start
1486                 ) {
1487                         lseek(f, 0, SEEK_SET);
1488                         range_start = 0;
1489                 } else {
1490                         range_len = range_end - range_start + 1;
1491                         send_headers(HTTP_PARTIAL_CONTENT);
1492                         headers = 0;
1493                 }
1494         }
1495 #endif
1496
1497         if (headers)
1498                 send_headers(HTTP_OK);
1499
1500         /* If you want to know about EPIPE below
1501          * (happens if you abort downloads from local httpd): */
1502         signal(SIGPIPE, SIG_IGN);
1503
1504 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1505         offset = range_start;
1506         do {
1507                 /* sz is rounded down to 64k */
1508                 ssize_t sz = MAXINT(ssize_t) - 0xffff;
1509                 USE_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1510                 count = sendfile(1, f, &offset, sz);
1511                 if (count < 0) {
1512                         if (offset == range_start)
1513                                 goto fallback;
1514                         goto fin;
1515                 }
1516                 USE_FEATURE_HTTPD_RANGES(range_len -= sz;)
1517         } while (count > 0 && range_len);
1518         log_and_exit();
1519
1520  fallback:
1521 #endif
1522         while ((count = safe_read(f, iobuf, IOBUF_SIZE)) > 0) {
1523                 ssize_t n;
1524                 USE_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1525                 n = full_write(1, iobuf, count);
1526                 if (count != n)
1527                         break;
1528                 USE_FEATURE_HTTPD_RANGES(range_len -= count;)
1529                 if (!range_len)
1530                         break;
1531         }
1532 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1533  fin:
1534 #endif
1535         if (count < 0 && verbose > 1)
1536                 bb_perror_msg("error");
1537         log_and_exit();
1538 }
1539
1540 static int checkPermIP(void)
1541 {
1542         Htaccess_IP *cur;
1543
1544         /* This could stand some work */
1545         for (cur = ip_a_d; cur; cur = cur->next) {
1546 #if DEBUG
1547                 fprintf(stderr,
1548                         "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1549                         rmt_ip_str,
1550                         (unsigned char)(cur->ip >> 24),
1551                         (unsigned char)(cur->ip >> 16),
1552                         (unsigned char)(cur->ip >> 8),
1553                         (unsigned char)(cur->ip),
1554                         (unsigned char)(cur->mask >> 24),
1555                         (unsigned char)(cur->mask >> 16),
1556                         (unsigned char)(cur->mask >> 8),
1557                         (unsigned char)(cur->mask)
1558                 );
1559 #endif
1560                 if ((rmt_ip & cur->mask) == cur->ip)
1561                         return cur->allow_deny == 'A';   /* Allow/Deny */
1562         }
1563
1564         /* if unconfigured, return 1 - access from all */
1565         return !flg_deny_all;
1566 }
1567
1568 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1569 /*
1570  * Check the permission file for access password protected.
1571  *
1572  * If config file isn't present, everything is allowed.
1573  * Entries are of the form you can see example from header source
1574  *
1575  * path      The file path.
1576  * request   User information to validate.
1577  *
1578  * Returns 1 if request is OK.
1579  */
1580 static int checkPerm(const char *path, const char *request)
1581 {
1582         Htaccess *cur;
1583         const char *p;
1584         const char *p0;
1585
1586         const char *prev = NULL;
1587
1588         /* This could stand some work */
1589         for (cur = g_auth; cur; cur = cur->next) {
1590                 size_t l;
1591
1592                 p0 = cur->before_colon;
1593                 if (prev != NULL && strcmp(prev, p0) != 0)
1594                         continue;       /* find next identical */
1595                 p = cur->after_colon;
1596                 if (DEBUG)
1597                         fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
1598
1599                 l = strlen(p0);
1600                 if (strncmp(p0, path, l) == 0
1601                  && (l == 1 || path[l] == '/' || path[l] == '\0')
1602                 ) {
1603                         char *u;
1604                         /* path match found.  Check request */
1605                         /* for check next /path:user:password */
1606                         prev = p0;
1607                         u = strchr(request, ':');
1608                         if (u == NULL) {
1609                                 /* bad request, ':' required */
1610                                 break;
1611                         }
1612
1613                         if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1614                                 char *cipher;
1615                                 char *pp;
1616
1617                                 if (strncmp(p, request, u - request) != 0) {
1618                                         /* user doesn't match */
1619                                         continue;
1620                                 }
1621                                 pp = strchr(p, ':');
1622                                 if (pp && pp[1] == '$' && pp[2] == '1'
1623                                  && pp[3] == '$' && pp[4]
1624                                 ) {
1625                                         pp++;
1626                                         cipher = pw_encrypt(u+1, pp);
1627                                         if (strcmp(cipher, pp) == 0)
1628                                                 goto set_remoteuser_var;   /* Ok */
1629                                         /* unauthorized */
1630                                         continue;
1631                                 }
1632                         }
1633
1634                         if (strcmp(p, request) == 0) {
1635  set_remoteuser_var:
1636                                 remoteuser = strdup(request);
1637                                 if (remoteuser)
1638                                         remoteuser[u - request] = '\0';
1639                                 return 1;   /* Ok */
1640                         }
1641                         /* unauthorized */
1642                 }
1643         } /* for */
1644
1645         return prev == NULL;
1646 }
1647 #endif  /* FEATURE_HTTPD_BASIC_AUTH */
1648
1649 /*
1650  * Handle timeouts
1651  */
1652 static void exit_on_signal(int sig) ATTRIBUTE_NORETURN;
1653 static void exit_on_signal(int sig)
1654 {
1655         send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1656 }
1657
1658 /*
1659  * Handle an incoming http request and exit.
1660  */
1661 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) ATTRIBUTE_NORETURN;
1662 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1663 {
1664         static const char request_GET[] ALIGN1 = "GET";
1665
1666         struct stat sb;
1667         char *urlcopy;
1668         char *urlp;
1669         char *tptr;
1670         int http_major_version;
1671         int ip_allowed;
1672 #if ENABLE_FEATURE_HTTPD_CGI
1673         const char *prequest;
1674         unsigned long length = 0;
1675         char *cookie = 0;
1676         char *content_type = 0;
1677 #endif
1678         struct sigaction sa;
1679 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1680         int credentials = -1;  /* if not required this is Ok */
1681 #endif
1682
1683         /* Allocation of iobuf is postponed until now
1684          * (IOW, server process doesn't need to waste 8k) */
1685         iobuf = xmalloc(IOBUF_SIZE);
1686
1687         rmt_ip = 0;
1688         if (fromAddr->sa.sa_family == AF_INET) {
1689                 rmt_ip = ntohl(fromAddr->sin.sin_addr.s_addr);
1690         }
1691 #if ENABLE_FEATURE_IPV6
1692         if (fromAddr->sa.sa_family == AF_INET6
1693          && fromAddr->sin6.sin6_addr.s6_addr32[0] == 0
1694          && fromAddr->sin6.sin6_addr.s6_addr32[1] == 0
1695          && ntohl(fromAddr->sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1696                 rmt_ip = ntohl(fromAddr->sin6.sin6_addr.s6_addr32[3]);
1697 #endif
1698         if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1699                 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->sa);
1700         }
1701         if (verbose) {
1702                 /* this trick makes -v logging much simpler */
1703                 applet_name = rmt_ip_str;
1704                 if (verbose > 2)
1705                         bb_error_msg("connected");
1706         }
1707
1708         /* Install timeout handler */
1709         memset(&sa, 0, sizeof(sa));
1710         sa.sa_handler = exit_on_signal;
1711         /* sigemptyset(&sa.sa_mask); - memset should be enough */
1712         /*sa.sa_flags = 0; - no SA_RESTART */
1713         sigaction(SIGALRM, &sa, NULL);
1714         alarm(HEADER_READ_TIMEOUT);
1715
1716         if (!get_line()) /* EOF or error or empty line */
1717                 send_headers_and_exit(HTTP_BAD_REQUEST);
1718
1719         /* Determine type of request (GET/POST) */
1720         urlp = strpbrk(iobuf, " \t");
1721         if (urlp == NULL)
1722                 send_headers_and_exit(HTTP_BAD_REQUEST);
1723         *urlp++ = '\0';
1724 #if ENABLE_FEATURE_HTTPD_CGI
1725         prequest = request_GET;
1726         if (strcasecmp(iobuf, prequest) != 0) {
1727                 prequest = "POST";
1728                 if (strcasecmp(iobuf, prequest) != 0)
1729                         send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1730         }
1731 #else
1732         if (strcasecmp(iobuf, request_GET) != 0)
1733                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1734 #endif
1735         urlp = skip_whitespace(urlp);
1736         if (urlp[0] != '/')
1737                 send_headers_and_exit(HTTP_BAD_REQUEST);
1738
1739         /* Find end of URL and parse HTTP version, if any */
1740         http_major_version = -1;
1741         tptr = strchrnul(urlp, ' ');
1742         /* Is it " HTTP/"? */
1743         if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0)
1744                 http_major_version = (tptr[6] - '0');
1745         *tptr = '\0';
1746
1747         /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
1748         urlcopy = alloca((tptr - urlp) + sizeof("/index.html"));
1749         /*if (urlcopy == NULL)
1750          *      send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
1751         strcpy(urlcopy, urlp);
1752         /* NB: urlcopy ptr is never changed after this */
1753
1754         /* Extract url args if present */
1755         tptr = strchr(urlcopy, '?');
1756         g_query = NULL;
1757         if (tptr) {
1758                 *tptr++ = '\0';
1759                 g_query = tptr;
1760         }
1761
1762         /* Decode URL escape sequences */
1763         tptr = decodeString(urlcopy, 0);
1764         if (tptr == NULL)
1765                 send_headers_and_exit(HTTP_BAD_REQUEST);
1766         if (tptr == urlcopy + 1) {
1767                 /* '/' or NUL is encoded */
1768                 send_headers_and_exit(HTTP_NOT_FOUND);
1769         }
1770
1771         /* Canonicalize path */
1772         /* Algorithm stolen from libbb bb_simplify_path(),
1773          * but don't strdup and reducing trailing slash and protect out root */
1774         urlp = tptr = urlcopy;
1775         do {
1776                 if (*urlp == '/') {
1777                         /* skip duplicate (or initial) slash */
1778                         if (*tptr == '/') {
1779                                 continue;
1780                         }
1781                         if (*tptr == '.') {
1782                                 /* skip extra '.' */
1783                                 if (tptr[1] == '/' || !tptr[1]) {
1784                                         continue;
1785                                 }
1786                                 /* '..': be careful */
1787                                 if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
1788                                         ++tptr;
1789                                         if (urlp == urlcopy) /* protect root */
1790                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
1791                                         while (*--urlp != '/') /* omit previous dir */;
1792                                                 continue;
1793                                 }
1794                         }
1795                 }
1796                 *++urlp = *tptr;
1797         } while (*++tptr);
1798         *++urlp = '\0';       /* so keep last character */
1799         tptr = urlp;          /* end ptr */
1800
1801         /* If URL is a directory, add '/' */
1802         if (tptr[-1] != '/') {
1803                 if (is_directory(urlcopy + 1, 1, &sb)) {
1804                         found_moved_temporarily = urlcopy;
1805                 }
1806         }
1807
1808         /* Log it */
1809         if (verbose > 1)
1810                 bb_error_msg("url:%s", urlcopy);
1811
1812         tptr = urlcopy;
1813         ip_allowed = checkPermIP();
1814         while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
1815                 /* have path1/path2 */
1816                 *tptr = '\0';
1817                 if (is_directory(urlcopy + 1, 1, &sb)) {
1818                         /* may be having subdir config */
1819                         parse_conf(urlcopy + 1, SUBDIR_PARSE);
1820                         ip_allowed = checkPermIP();
1821                 }
1822                 *tptr = '/';
1823         }
1824         if (http_major_version >= 0) {
1825                 /* Request was with "... HTTP/nXXX", and n >= 0 */
1826
1827                 /* Read until blank line for HTTP version specified, else parse immediate */
1828                 while (1) {
1829                         alarm(HEADER_READ_TIMEOUT);
1830                         if (!get_line())
1831                                 break; /* EOF or error or empty line */
1832                         if (DEBUG)
1833                                 bb_error_msg("header: '%s'", iobuf);
1834
1835 #if ENABLE_FEATURE_HTTPD_CGI
1836                         /* try and do our best to parse more lines */
1837                         if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
1838                                 /* extra read only for POST */
1839                                 if (prequest != request_GET) {
1840                                         tptr = iobuf + sizeof("Content-length:") - 1;
1841                                         if (!tptr[0])
1842                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
1843                                         errno = 0;
1844                                         /* not using strtoul: it ignores leading minus! */
1845                                         length = strtol(tptr, &tptr, 10);
1846                                         /* length is "ulong", but we need to pass it to int later */
1847                                         /* so we check for negative or too large values in one go: */
1848                                         /* (long -> ulong conv caused negatives to be seen as > INT_MAX) */
1849                                         if (tptr[0] || errno || length > INT_MAX)
1850                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
1851                                 }
1852                         } else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
1853                                 cookie = strdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
1854                         } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
1855                                 content_type = strdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
1856                         } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
1857                                 referer = strdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
1858                         } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
1859                                 user_agent = strdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
1860                         }
1861 #endif
1862 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1863                         if (STRNCASECMP(iobuf, "Authorization:") == 0) {
1864                                 /* We only allow Basic credentials.
1865                                  * It shows up as "Authorization: Basic <userid:password>" where
1866                                  * the userid:password is base64 encoded.
1867                                  */
1868                                 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
1869                                 if (STRNCASECMP(tptr, "Basic") != 0)
1870                                         continue;
1871                                 tptr += sizeof("Basic")-1;
1872                                 /* decodeBase64() skips whitespace itself */
1873                                 decodeBase64(tptr);
1874                                 credentials = checkPerm(urlcopy, tptr);
1875                         }
1876 #endif          /* FEATURE_HTTPD_BASIC_AUTH */
1877 #if ENABLE_FEATURE_HTTPD_RANGES
1878                         if (STRNCASECMP(iobuf, "Range:") == 0) {
1879                                 // We know only bytes=NNN-[MMM]
1880                                 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
1881                                 if (strncmp(s, "bytes=", 6) == 0) {
1882                                         s += sizeof("bytes=")-1;
1883                                         range_start = BB_STRTOOFF(s, &s, 10);
1884                                         if (s[0] != '-' || range_start < 0) {
1885                                                 range_start = 0;
1886                                         } else if (s[1]) {
1887                                                 range_end = BB_STRTOOFF(s+1, NULL, 10);
1888                                                 if (errno || range_end < range_start)
1889                                                         range_start = 0;
1890                                         }
1891                                 }
1892                         }
1893 #endif
1894                 } /* while extra header reading */
1895         }
1896
1897         /* We read headers, disable peer timeout */
1898         alarm(0);
1899
1900         if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || ip_allowed == 0) {
1901                 /* protect listing [/path]/httpd_conf or IP deny */
1902                 send_headers_and_exit(HTTP_FORBIDDEN);
1903         }
1904
1905 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1906         if (credentials <= 0 && checkPerm(urlcopy, ":") == 0) {
1907                 send_headers_and_exit(HTTP_UNAUTHORIZED);
1908         }
1909 #endif
1910
1911         if (found_moved_temporarily) {
1912                 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
1913         }
1914
1915         tptr = urlcopy + 1;      /* skip first '/' */
1916
1917 #if ENABLE_FEATURE_HTTPD_CGI
1918         if (strncmp(tptr, "cgi-bin/", 8) == 0) {
1919                 if (tptr[8] == '\0') {
1920                         /* protect listing "cgi-bin/" */
1921                         send_headers_and_exit(HTTP_FORBIDDEN);
1922                 }
1923                 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
1924         }
1925 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1926         {
1927                 char *suffix = strrchr(tptr, '.');
1928                 if (suffix) {
1929                         Htaccess *cur;
1930                         for (cur = script_i; cur; cur = cur->next) {
1931                                 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1932                                         send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
1933                                 }
1934                         }
1935                 }
1936         }
1937 #endif
1938         if (prequest != request_GET) {
1939                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1940         }
1941 #endif  /* FEATURE_HTTPD_CGI */
1942
1943         if (urlp[-1] == '/')
1944                 strcpy(urlp, "index.html");
1945         if (stat(tptr, &sb) == 0) {
1946                 file_size = sb.st_size;
1947                 last_mod = sb.st_mtime;
1948         }
1949 #if ENABLE_FEATURE_HTTPD_CGI
1950         else if (urlp[-1] == '/') {
1951                 /* It's a dir URL and there is no index.html
1952                  * Try cgi-bin/index.cgi */
1953                 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
1954                         urlp[0] = '\0';
1955                         g_query = urlcopy;
1956                         send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
1957                 }
1958         }
1959 #endif
1960         /* else {
1961          *      fall through to send_file, it errors out if open fails
1962          * }
1963          */
1964
1965         send_file_and_exit(tptr, TRUE);
1966 }
1967
1968 /*
1969  * The main http server function.
1970  * Given a socket, listen for new connections and farm out
1971  * the processing as a [v]forked process.
1972  * Never returns.
1973  */
1974 #if BB_MMU
1975 static void mini_httpd(int server_socket) ATTRIBUTE_NORETURN;
1976 static void mini_httpd(int server_socket)
1977 {
1978         /* NB: it's best to not use xfuncs in this loop before fork().
1979          * Otherwise server may die on transient errors (temporary
1980          * out-of-memory condition, etc), which is Bad(tm).
1981          * Try to do any dangerous calls after fork.
1982          */
1983         while (1) {
1984                 int n;
1985                 len_and_sockaddr fromAddr;
1986                 
1987                 /* Wait for connections... */
1988                 fromAddr.len = LSA_SIZEOF_SA;
1989                 n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
1990
1991                 if (n < 0)
1992                         continue;
1993                 /* set the KEEPALIVE option to cull dead connections */
1994                 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
1995
1996                 if (fork() == 0) {
1997                         /* child */
1998 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1999                         /* Do not reload config on HUP */
2000                         signal(SIGHUP, SIG_IGN);
2001 #endif
2002                         close(server_socket);
2003                         xmove_fd(n, 0);
2004                         xdup2(0, 1);
2005
2006                         handle_incoming_and_exit(&fromAddr);
2007                 }
2008                 /* parent, or fork failed */
2009                 close(n);
2010         } /* while (1) */
2011         /* never reached */
2012 }
2013 #else
2014 static void mini_httpd_nommu(int server_socket, int argc, char **argv) ATTRIBUTE_NORETURN;
2015 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2016 {
2017         char *argv_copy[argc + 2];
2018
2019         argv_copy[0] = argv[0];
2020         argv_copy[1] = (char*)"-i";
2021         memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2022
2023         /* NB: it's best to not use xfuncs in this loop before vfork().
2024          * Otherwise server may die on transient errors (temporary
2025          * out-of-memory condition, etc), which is Bad(tm).
2026          * Try to do any dangerous calls after fork.
2027          */
2028         while (1) {
2029                 int n;
2030                 len_and_sockaddr fromAddr;
2031                 
2032                 /* Wait for connections... */
2033                 fromAddr.len = LSA_SIZEOF_SA;
2034                 n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
2035
2036                 if (n < 0)
2037                         continue;
2038                 /* set the KEEPALIVE option to cull dead connections */
2039                 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2040
2041                 if (vfork() == 0) {
2042                         /* child */
2043 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2044                         /* Do not reload config on HUP */
2045                         signal(SIGHUP, SIG_IGN);
2046 #endif
2047                         close(server_socket);
2048                         xmove_fd(n, 0);
2049                         xdup2(0, 1);
2050
2051                         /* Run a copy of ourself in inetd mode */
2052                         re_exec(argv_copy);
2053                 }
2054                 /* parent, or vfork failed */
2055                 close(n);
2056         } /* while (1) */
2057         /* never reached */
2058 }
2059 #endif
2060
2061 /*
2062  * Process a HTTP connection on stdin/out.
2063  * Never returns.
2064  */
2065 static void mini_httpd_inetd(void) ATTRIBUTE_NORETURN;
2066 static void mini_httpd_inetd(void)
2067 {
2068         len_and_sockaddr fromAddr;
2069
2070         fromAddr.len = LSA_SIZEOF_SA;
2071         getpeername(0, &fromAddr.sa, &fromAddr.len);
2072         handle_incoming_and_exit(&fromAddr);
2073 }
2074
2075 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2076 static void sighup_handler(int sig)
2077 {
2078         struct sigaction sa;
2079
2080         parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
2081
2082         memset(&sa, 0, sizeof(sa));
2083         sa.sa_handler = sighup_handler;
2084         /*sigemptyset(&sa.sa_mask); - memset should be enough */
2085         sa.sa_flags = SA_RESTART;
2086         sigaction(SIGHUP, &sa, NULL);
2087 }
2088 #endif
2089
2090 enum {
2091         c_opt_config_file = 0,
2092         d_opt_decode_url,
2093         h_opt_home_httpd,
2094         USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2095         USE_FEATURE_HTTPD_BASIC_AUTH(    r_opt_realm     ,)
2096         USE_FEATURE_HTTPD_AUTH_MD5(      m_opt_md5       ,)
2097         USE_FEATURE_HTTPD_SETUID(        u_opt_setuid    ,)
2098         p_opt_port      ,
2099         p_opt_inetd     ,
2100         p_opt_foreground,
2101         p_opt_verbose   ,
2102         OPT_CONFIG_FILE = 1 << c_opt_config_file,
2103         OPT_DECODE_URL  = 1 << d_opt_decode_url,
2104         OPT_HOME_HTTPD  = 1 << h_opt_home_httpd,
2105         OPT_ENCODE_URL  = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2106         OPT_REALM       = USE_FEATURE_HTTPD_BASIC_AUTH(    (1 << r_opt_realm     )) + 0,
2107         OPT_MD5         = USE_FEATURE_HTTPD_AUTH_MD5(      (1 << m_opt_md5       )) + 0,
2108         OPT_SETUID      = USE_FEATURE_HTTPD_SETUID(        (1 << u_opt_setuid    )) + 0,
2109         OPT_PORT        = 1 << p_opt_port,
2110         OPT_INETD       = 1 << p_opt_inetd,
2111         OPT_FOREGROUND  = 1 << p_opt_foreground,
2112         OPT_VERBOSE     = 1 << p_opt_verbose,
2113 };
2114
2115
2116 int httpd_main(int argc, char **argv);
2117 int httpd_main(int argc, char **argv)
2118 {
2119         int server_socket = server_socket; /* for gcc */
2120         unsigned opt;
2121         char *url_for_decode;
2122         USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2123         USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2124         USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2125         USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2126
2127         INIT_G();
2128
2129 #if ENABLE_LOCALE_SUPPORT
2130         /* Undo busybox.c: we want to speak English in http (dates etc) */
2131         setlocale(LC_TIME, "C");
2132 #endif
2133
2134         home_httpd = xrealloc_getcwd_or_warn(NULL);
2135         /* -v counts, -i implies -f */
2136         opt_complementary = "vv:if";
2137         /* We do not "absolutize" path given by -h (home) opt.
2138          * If user gives relative path in -h, $SCRIPT_FILENAME can end up
2139          * relative too. */
2140         opt = getopt32(argv, "c:d:h:"
2141                         USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2142                         USE_FEATURE_HTTPD_BASIC_AUTH("r:")
2143                         USE_FEATURE_HTTPD_AUTH_MD5("m:")
2144                         USE_FEATURE_HTTPD_SETUID("u:")
2145                         "p:ifv",
2146                         &configFile, &url_for_decode, &home_httpd
2147                         USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2148                         USE_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2149                         USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
2150                         USE_FEATURE_HTTPD_SETUID(, &s_ugid)
2151                         , &bind_addr_or_port
2152                         , &verbose
2153                 );
2154         if (opt & OPT_DECODE_URL) {
2155                 fputs(decodeString(url_for_decode, 1), stdout);
2156                 return 0;
2157         }
2158 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2159         if (opt & OPT_ENCODE_URL) {
2160                 fputs(encodeString(url_for_encode), stdout);
2161                 return 0;
2162         }
2163 #endif
2164 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2165         if (opt & OPT_MD5) {
2166                 puts(pw_encrypt(pass, "$1$"));
2167                 return 0;
2168         }
2169 #endif
2170 #if ENABLE_FEATURE_HTTPD_SETUID
2171         if (opt & OPT_SETUID) {
2172                 if (!get_uidgid(&ugid, s_ugid, 1))
2173                         bb_error_msg_and_die("unrecognized user[:group] "
2174                                                 "name '%s'", s_ugid);
2175         }
2176 #endif
2177
2178 #if !BB_MMU
2179         if (!(opt & OPT_FOREGROUND)) {
2180                 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2181         }
2182 #endif
2183
2184         xchdir(home_httpd);
2185         if (!(opt & OPT_INETD)) {
2186                 signal(SIGCHLD, SIG_IGN);
2187                 server_socket = openServer();
2188 #if ENABLE_FEATURE_HTTPD_SETUID
2189                 /* drop privileges */
2190                 if (opt & OPT_SETUID) {
2191                         if (ugid.gid != (gid_t)-1) {
2192                                 if (setgroups(1, &ugid.gid) == -1)
2193                                         bb_perror_msg_and_die("setgroups");
2194                                 xsetgid(ugid.gid);
2195                         }
2196                         xsetuid(ugid.uid);
2197                 }
2198 #endif
2199         }
2200
2201 #if 0 /*was #if ENABLE_FEATURE_HTTPD_CGI*/
2202         /* User can do it himself: 'env - PATH="$PATH" httpd'
2203          * We don't do it because we don't want to screw users
2204          * which want to do
2205          * 'env - VAR1=val1 VAR2=val2 https'
2206          * and have VAR1 and VAR2 values visible in their CGIs.
2207          * Besides, it is also smaller. */
2208         {
2209                 char *p = getenv("PATH");
2210                 /* env strings themself are not freed, no need to strdup(p): */
2211                 clearenv();
2212                 if (p)
2213                         putenv(p - 5);
2214 //              if (!(opt & OPT_INETD))
2215 //                      setenv_long("SERVER_PORT", ???);
2216         }
2217 #endif
2218
2219 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2220         if (!(opt & OPT_INETD))
2221                 sighup_handler(0);
2222         else /* do not install HUP handler in inetd mode */
2223 #endif
2224                 parse_conf(default_path_httpd_conf, FIRST_PARSE);
2225
2226         xfunc_error_retval = 0;
2227         if (opt & OPT_INETD)
2228                 mini_httpd_inetd();
2229 #if BB_MMU
2230         if (!(opt & OPT_FOREGROUND))
2231                 bb_daemonize(0); /* don't change current directory */
2232         mini_httpd(server_socket); /* never returns */
2233 #else
2234         mini_httpd_nommu(server_socket, argc, argv); /* never returns */
2235 #endif
2236         /* return 0; */
2237 }