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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 contains "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 * /cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/
46 * /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/
47 * /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/
48 * .au:audio/basic # additional mime type for audio.au files
49 * *.php:/path/php # running cgi.php scripts through an interpreter
50 *
51 * A/D may be as a/d or allow/deny - first char case insensitive
52 * Deny IP rules take precedence over allow rules.
53 *
54 *
55 * The Deny/Allow IP logic:
56 *
57 * - Default is to allow all. No addresses are denied unless
58 * denied with a D: rule.
59 * - Order of Deny/Allow rules is significant
60 * - Deny rules take precedence over allow rules.
61 * - If a deny all rule (D:*) is used it acts as a catch-all for unmatched
62 * addresses.
63 * - Specification of Allow all (A:*) is a no-op
64 *
65 * Example:
66 * 1. Allow only specified addresses
67 * A:172.20 # Allow any address that begins with 172.20.
68 * A:10.10. # Allow any address that begins with 10.10.
69 * A:127.0.0.1 # Allow local loopback connections
70 * D:* # Deny from other IP connections
71 *
72 * 2. Only deny specified addresses
73 * D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255
74 * D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255
75 * A:* # (optional line added for clarity)
76 *
77 * If a sub directory contains a config file it is parsed and merged with
78 * any existing settings as if it was appended to the original configuration.
79 *
80 * subdir paths are relative to the containing subdir and thus cannot
81 * affect the parent rules.
82 *
83 * Note that since the sub dir is parsed in the forked thread servicing the
84 * subdir http request, any merge is discarded when the process exits. As a
85 * result, the subdir settings only have a lifetime of a single request.
86 *
87 *
88 * If -c is not set, an attempt will be made to open the default
89 * root configuration file. If -c is set and the file is not found, the
90 * server exits with an error.
91 *
92*/
93
94
95#include "busybox.h"
96
97
98static const char httpdVersion[] = "busybox httpd/1.35 6-Oct-2004";
99static const char default_path_httpd_conf[] = "/etc";
100static const char httpd_conf[] = "httpd.conf";
101static const char home[] = "./";
102
103#define TIMEOUT 60
104
105// Note: busybox xfuncs are not used because we want the server to keep running
106// if something bad happens due to a malformed user request.
107// As a result, all memory allocation after daemonize
108// is checked rigorously
109
110//#define DEBUG 1
111
112#ifndef DEBUG
113# define DEBUG 0
114#endif
115
116#define MAX_MEMORY_BUFF 8192 /* IO buffer */
117
118typedef struct HT_ACCESS {
119 char *after_colon;
120 struct HT_ACCESS *next;
121 char before_colon[1]; /* really bigger, must last */
122} Htaccess;
123
124typedef struct HT_ACCESS_IP {
125 unsigned int ip;
126 unsigned int mask;
127 int allow_deny;
128 struct HT_ACCESS_IP *next;
129} Htaccess_IP;
130
131typedef struct {
132 char buf[MAX_MEMORY_BUFF];
133
134 USE_FEATURE_HTTPD_BASIC_AUTH(const char *realm;)
135 USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
136
137 const char *query;
138
139 USE_FEATURE_HTTPD_CGI(char *referer;)
140
141 const char *configFile;
142
143 unsigned int rmt_ip;
144#if ENABLE_FEATURE_HTTPD_CGI || DEBUG
145 char rmt_ip_str[16]; /* for set env REMOTE_ADDR */
146#endif
147 unsigned port; /* server initial port and for
148 set env REMOTE_PORT */
149 const char *found_mime_type;
150 const char *found_moved_temporarily;
151
152 off_t ContentLength; /* -1 - unknown */
153 time_t last_mod;
154
155 Htaccess_IP *ip_a_d; /* config allow/deny lines */
156 int flg_deny_all;
157#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
158 Htaccess *auth; /* config user:password lines */
159#endif
160#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
161 Htaccess *mime_a; /* config mime types */
162#endif
163
164 int server_socket;
165 int accepted_socket;
166 volatile int alarm_signaled;
167
168#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
169 Htaccess *script_i; /* config script interpreters */
170#endif
171} HttpdConfig;
172
173static HttpdConfig *config;
174
175static const char request_GET[] = "GET"; /* size algorithmic optimize */
176
177static const char* const suffixTable [] = {
178/* Warning: shorted equivalent suffix in one line must be first */
179 ".htm.html", "text/html",
180 ".jpg.jpeg", "image/jpeg",
181 ".gif", "image/gif",
182 ".png", "image/png",
183 ".txt.h.c.cc.cpp", "text/plain",
184 ".css", "text/css",
185 ".wav", "audio/wav",
186 ".avi", "video/x-msvideo",
187 ".qt.mov", "video/quicktime",
188 ".mpe.mpeg", "video/mpeg",
189 ".mid.midi", "audio/midi",
190 ".mp3", "audio/mpeg",
191#if 0 /* unpopular */
192 ".au", "audio/basic",
193 ".pac", "application/x-ns-proxy-autoconfig",
194 ".vrml.wrl", "model/vrml",
195#endif
196 0, "application/octet-stream" /* default */
197};
198
199typedef enum {
200 HTTP_OK = 200,
201 HTTP_MOVED_TEMPORARILY = 302,
202 HTTP_BAD_REQUEST = 400, /* malformed syntax */
203 HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
204 HTTP_NOT_FOUND = 404,
205 HTTP_FORBIDDEN = 403,
206 HTTP_REQUEST_TIMEOUT = 408,
207 HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */
208 HTTP_INTERNAL_SERVER_ERROR = 500,
209#if 0 /* future use */
210 HTTP_CONTINUE = 100,
211 HTTP_SWITCHING_PROTOCOLS = 101,
212 HTTP_CREATED = 201,
213 HTTP_ACCEPTED = 202,
214 HTTP_NON_AUTHORITATIVE_INFO = 203,
215 HTTP_NO_CONTENT = 204,
216 HTTP_MULTIPLE_CHOICES = 300,
217 HTTP_MOVED_PERMANENTLY = 301,
218 HTTP_NOT_MODIFIED = 304,
219 HTTP_PAYMENT_REQUIRED = 402,
220 HTTP_BAD_GATEWAY = 502,
221 HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
222 HTTP_RESPONSE_SETSIZE = 0xffffffff
223#endif
224} HttpResponseNum;
225
226typedef struct {
227 HttpResponseNum type;
228 const char *name;
229 const char *info;
230} HttpEnumString;
231
232static const HttpEnumString httpResponseNames[] = {
233 { HTTP_OK, "OK", NULL },
234 { HTTP_MOVED_TEMPORARILY, "Found", "Directories must end with a slash." },
235 { HTTP_REQUEST_TIMEOUT, "Request Timeout",
236 "No request appeared within a reasonable time period." },
237 { HTTP_NOT_IMPLEMENTED, "Not Implemented",
238 "The requested method is not recognized by this server." },
239#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
240 { HTTP_UNAUTHORIZED, "Unauthorized", "" },
241#endif
242 { HTTP_NOT_FOUND, "Not Found",
243 "The requested URL was not found on this server." },
244 { HTTP_BAD_REQUEST, "Bad Request", "Unsupported method." },
245 { HTTP_FORBIDDEN, "Forbidden", "" },
246 { HTTP_INTERNAL_SERVER_ERROR, "Internal Server Error",
247 "Internal Server Error" },
248#if 0 /* not implemented */
249 { HTTP_CREATED, "Created" },
250 { HTTP_ACCEPTED, "Accepted" },
251 { HTTP_NO_CONTENT, "No Content" },
252 { HTTP_MULTIPLE_CHOICES, "Multiple Choices" },
253 { HTTP_MOVED_PERMANENTLY, "Moved Permanently" },
254 { HTTP_NOT_MODIFIED, "Not Modified" },
255 { HTTP_BAD_GATEWAY, "Bad Gateway", "" },
256 { HTTP_SERVICE_UNAVAILABLE, "Service Unavailable", "" },
257#endif
258};
259
260
261static const char RFC1123FMT[] = "%a, %d %b %Y %H:%M:%S GMT";
262
263
264#define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
265
266
267static int scan_ip(const char **ep, unsigned int *ip, unsigned char endc)
268{
269 const char *p = *ep;
270 int auto_mask = 8;
271 int j;
272
273 *ip = 0;
274 for (j = 0; j < 4; j++) {
275 unsigned int octet;
276
277 if ((*p < '0' || *p > '9') && (*p != '/' || j == 0) && *p != 0)
278 return -auto_mask;
279 octet = 0;
280 while (*p >= '0' && *p <= '9') {
281 octet *= 10;
282 octet += *p - '0';
283 if (octet > 255)
284 return -auto_mask;
285 p++;
286 }
287 if (*p == '.')
288 p++;
289 if (*p != '/' && *p != 0)
290 auto_mask += 8;
291 *ip = ((*ip) << 8) | octet;
292 }
293 if (*p != 0) {
294 if (*p != endc)
295 return -auto_mask;
296 p++;
297 if (*p == 0)
298 return -auto_mask;
299 }
300 *ep = p;
301 return auto_mask;
302}
303
304static int scan_ip_mask(const char *ipm, unsigned int *ip, unsigned int *mask)
305{
306 int i;
307 unsigned int msk;
308
309 i = scan_ip(&ipm, ip, '/');
310 if (i < 0)
311 return i;
312 if (*ipm) {
313 const char *p = ipm;
314
315 i = 0;
316 while (*p) {
317 if (*p < '0' || *p > '9') {
318 if (*p == '.') {
319 i = scan_ip(&ipm, mask, 0);
320 return i != 32;
321 }
322 return -1;
323 }
324 i *= 10;
325 i += *p - '0';
326 p++;
327 }
328 }
329 if (i > 32 || i < 0)
330 return -1;
331 msk = 0x80000000;
332 *mask = 0;
333 while (i > 0) {
334 *mask |= msk;
335 msk >>= 1;
336 i--;
337 }
338 return 0;
339}
340
341#if ENABLE_FEATURE_HTTPD_BASIC_AUTH || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
342static void free_config_lines(Htaccess **pprev)
343{
344 Htaccess *prev = *pprev;
345
346 while (prev) {
347 Htaccess *cur = prev;
348
349 prev = cur->next;
350 free(cur);
351 }
352 *pprev = NULL;
353}
354#endif
355
356/* flag */
357#define FIRST_PARSE 0
358#define SUBDIR_PARSE 1
359#define SIGNALED_PARSE 2
360#define FIND_FROM_HTTPD_ROOT 3
361/****************************************************************************
362 *
363 > $Function: parse_conf()
364 *
365 * $Description: parse configuration file into in-memory linked list.
366 *
367 * The first non-white character is examined to determine if the config line
368 * is one of the following:
369 * .ext:mime/type # new mime type not compiled into httpd
370 * [adAD]:from # ip address allow/deny, * for wildcard
371 * /path:user:pass # username/password
372 *
373 * Any previous IP rules are discarded.
374 * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
375 * are also discarded. That is, previous settings are retained if flag is
376 * SUBDIR_PARSE.
377 *
378 * $Parameters:
379 * (const char *) path . . null for ip address checks, path for password
380 * checks.
381 * (int) flag . . . . . . the source of the parse request.
382 *
383 * $Return: (None)
384 *
385 ****************************************************************************/
386static void parse_conf(const char *path, int flag)
387{
388 FILE *f;
389#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
390 Htaccess *prev, *cur;
391#elif ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
392 Htaccess *cur;
393#endif
394
395 const char *cf = config->configFile;
396 char buf[160];
397 char *p0 = NULL;
398 char *c, *p;
399
400 /* free previous ip setup if present */
401 Htaccess_IP *pip = config->ip_a_d;
402
403 while (pip) {
404 Htaccess_IP *cur_ipl = pip;
405
406 pip = cur_ipl->next;
407 free(cur_ipl);
408 }
409 config->ip_a_d = NULL;
410
411 config->flg_deny_all = 0;
412
413#if ENABLE_FEATURE_HTTPD_BASIC_AUTH || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
414 /* retain previous auth and mime config only for subdir parse */
415 if (flag != SUBDIR_PARSE) {
416#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
417 free_config_lines(&config->auth);
418#endif
419#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
420 free_config_lines(&config->mime_a);
421#endif
422#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
423 free_config_lines(&config->script_i);
424#endif
425 }
426#endif
427
428 if (flag == SUBDIR_PARSE || cf == NULL) {
429 cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
430 if (cf == NULL) {
431 if (flag == FIRST_PARSE)
432 bb_error_msg_and_die(bb_msg_memory_exhausted);
433 return;
434 }
435 sprintf((char *)cf, "%s/%s", path, httpd_conf);
436 }
437
438 while ((f = fopen(cf, "r")) == NULL) {
439 if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
440 /* config file not found, no changes to config */
441 return;
442 }
443 if (config->configFile && flag == FIRST_PARSE) /* if -c option given */
444 bb_perror_msg_and_die("%s", cf);
445 flag = FIND_FROM_HTTPD_ROOT;
446 cf = httpd_conf;
447 }
448
449#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
450 prev = config->auth;
451#endif
452 /* This could stand some work */
453 while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
454 c = NULL;
455 for (p = p0; *p0 != 0 && *p0 != '#'; p0++) {
456 if (!isspace(*p0)) {
457 *p++ = *p0;
458 if (*p0 == ':' && c == NULL)
459 c = p;
460 }
461 }
462 *p = 0;
463
464 /* test for empty or strange line */
465 if (c == NULL || *c == 0)
466 continue;
467 p0 = buf;
468 if (*p0 == 'd')
469 *p0 = 'D';
470 if (*c == '*') {
471 if (*p0 == 'D') {
472 /* memorize deny all */
473 config->flg_deny_all++;
474 }
475 /* skip default other "word:*" config lines */
476 continue;
477 }
478
479 if (*p0 == 'a')
480 *p0 = 'A';
481 else if (*p0 != 'D' && *p0 != 'A'
482#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
483 && *p0 != '/'
484#endif
485#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
486 && *p0 != '.'
487#endif
488#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
489 && *p0 != '*'
490#endif
491 )
492 continue;
493 if (*p0 == 'A' || *p0 == 'D') {
494 /* storing current config IP line */
495 pip = calloc(1, sizeof(Htaccess_IP));
496 if (pip) {
497 if (scan_ip_mask(c, &(pip->ip), &(pip->mask))) {
498 /* syntax IP{/mask} error detected, protect all */
499 *p0 = 'D';
500 pip->mask = 0;
501 }
502 pip->allow_deny = *p0;
503 if (*p0 == 'D') {
504 /* Deny:form_IP move top */
505 pip->next = config->ip_a_d;
506 config->ip_a_d = pip;
507 } else {
508 /* add to bottom A:form_IP config line */
509 Htaccess_IP *prev_IP = config->ip_a_d;
510
511 if (prev_IP == NULL) {
512 config->ip_a_d = pip;
513 } else {
514 while (prev_IP->next)
515 prev_IP = prev_IP->next;
516 prev_IP->next = pip;
517 }
518 }
519 }
520 continue;
521 }
522#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
523 if (*p0 == '/') {
524 /* make full path from httpd root / curent_path / config_line_path */
525 cf = flag == SUBDIR_PARSE ? path : "";
526 p0 = malloc(strlen(cf) + (c - buf) + 2 + strlen(c));
527 if (p0 == NULL)
528 continue;
529 c[-1] = 0;
530 sprintf(p0, "/%s%s", cf, buf);
531
532 /* another call bb_simplify_path */
533 cf = p = p0;
534
535 do {
536 if (*p == '/') {
537 if (*cf == '/') { /* skip duplicate (or initial) slash */
538 continue;
539 } else if (*cf == '.') {
540 if (cf[1] == '/' || cf[1] == 0) { /* remove extra '.' */
541 continue;
542 } else if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == 0)) {
543 ++cf;
544 if (p > p0) {
545 while (*--p != '/') /* omit previous dir */;
546 }
547 continue;
548 }
549 }
550 }
551 *++p = *cf;
552 } while (*++cf);
553
554 if ((p == p0) || (*p != '/')) { /* not a trailing slash */
555 ++p; /* so keep last character */
556 }
557 *p = 0;
558 sprintf(p0, "%s:%s", p0, c);
559 }
560#endif
561
562#if ENABLE_FEATURE_HTTPD_BASIC_AUTH || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
563 /* storing current config line */
564 cur = calloc(1, sizeof(Htaccess) + strlen(p0));
565 if (cur) {
566 cf = strcpy(cur->before_colon, p0);
567 c = strchr(cf, ':');
568 *c++ = 0;
569 cur->after_colon = c;
570#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
571 if (*cf == '.') {
572 /* config .mime line move top for overwrite previous */
573 cur->next = config->mime_a;
574 config->mime_a = cur;
575 continue;
576 }
577#endif
578#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
579 if (*cf == '*' && cf[1] == '.') {
580 /* config script interpreter line move top for overwrite previous */
581 cur->next = config->script_i;
582 config->script_i = cur;
583 continue;
584 }
585#endif
586#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
587 free(p0);
588 if (prev == NULL) {
589 /* first line */
590 config->auth = prev = cur;
591 } else {
592 /* sort path, if current lenght eq or bigger then move up */
593 Htaccess *prev_hti = config->auth;
594 size_t l = strlen(cf);
595 Htaccess *hti;
596
597 for (hti = prev_hti; hti; hti = hti->next) {
598 if (l >= strlen(hti->before_colon)) {
599 /* insert before hti */
600 cur->next = hti;
601 if (prev_hti != hti) {
602 prev_hti->next = cur;
603 } else {
604 /* insert as top */
605 config->auth = cur;
606 }
607 break;
608 }
609 if (prev_hti != hti)
610 prev_hti = prev_hti->next;
611 }
612 if (!hti) { /* not inserted, add to bottom */
613 prev->next = cur;
614 prev = cur;
615 }
616 }
617#endif
618 }
619#endif
620 }
621 fclose(f);
622}
623
624#if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
625/****************************************************************************
626 *
627 > $Function: encodeString()
628 *
629 * $Description: Given a string, html encode special characters.
630 * This is used for the -e command line option to provide an easy way
631 * for scripts to encode result data without confusing browsers. The
632 * returned string pointer is memory allocated by malloc().
633 *
634 * $Parameters:
635 * (const char *) string . . The first string to encode.
636 *
637 * $Return: (char *) . . . .. . . A pointer to the encoded string.
638 *
639 * $Errors: Returns a null string ("") if memory is not available.
640 *
641 ****************************************************************************/
642static char *encodeString(const char *string)
643{
644 /* take the simple route and encode everything */
645 /* could possibly scan once to get length. */
646 int len = strlen(string);
647 char *out = malloc(len * 6 + 1);
648 char *p = out;
649 char ch;
650
651 if (!out) return "";
652 while ((ch = *string++)) {
653 // very simple check for what to encode
654 if (isalnum(ch)) *p++ = ch;
655 else p += sprintf(p, "&#%d;", (unsigned char) ch);
656 }
657 *p = 0;
658 return out;
659}
660#endif /* FEATURE_HTTPD_ENCODE_URL_STR */
661
662/****************************************************************************
663 *
664 > $Function: decodeString()
665 *
666 * $Description: Given a URL encoded string, convert it to plain ascii.
667 * Since decoding always makes strings smaller, the decode is done in-place.
668 * Thus, callers should strdup() the argument if they do not want the
669 * argument modified. The return is the original pointer, allowing this
670 * function to be easily used as arguments to other functions.
671 *
672 * $Parameters:
673 * (char *) string . . . The first string to decode.
674 * (int) option_d . . 1 if called for httpd -d
675 *
676 * $Return: (char *) . . . . A pointer to the decoded string (same as input).
677 *
678 * $Errors: None
679 *
680 ****************************************************************************/
681static char *decodeString(char *orig, int option_d)
682{
683 /* note that decoded string is always shorter than original */
684 char *string = orig;
685 char *ptr = string;
686 char c;
687
688 while ((c = *ptr++) != '\0') {
689 unsigned value1, value2;
690
691 if (option_d && c == '+') {
692 *string++ = ' ';
693 continue;
694 }
695 if (c != '%') {
696 *string++ = c;
697 continue;
698 }
699 if (sscanf(ptr, "%1X", &value1) != 1
700 || sscanf(ptr+1, "%1X", &value2) != 1
701 ) {
702 if (!option_d)
703 return NULL;
704 *string++ = '%';
705 continue;
706 }
707 value1 = value1 * 16 + value2;
708 if (!option_d && (value1 == '/' || value1 == '\0')) {
709 /* caller takes it as indication of invalid
710 * (dangerous wrt exploits) chars */
711 return orig + 1;
712 }
713 *string++ = value1;
714 ptr += 2;
715 }
716 *string = '\0';
717 return orig;
718}
719
720
721#if ENABLE_FEATURE_HTTPD_CGI
722/****************************************************************************
723 * setenv helpers
724 ****************************************************************************/
725static void setenv1(const char *name, const char *value)
726{
727 if (!value)
728 value = "";
729 setenv(name, value, 1);
730}
731static void setenv_long(const char *name, long value)
732{
733 char buf[sizeof(value)*3 + 1];
734 sprintf(buf, "%ld", value);
735 setenv(name, buf, 1);
736}
737#endif
738
739#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
740/****************************************************************************
741 *
742 > $Function: decodeBase64()
743 *
744 > $Description: Decode a base 64 data stream as per rfc1521.
745 * Note that the rfc states that none base64 chars are to be ignored.
746 * Since the decode always results in a shorter size than the input, it is
747 * OK to pass the input arg as an output arg.
748 *
749 * $Parameter:
750 * (char *) Data . . . . A pointer to a base64 encoded string.
751 * Where to place the decoded data.
752 *
753 * $Return: void
754 *
755 * $Errors: None
756 *
757 ****************************************************************************/
758static void decodeBase64(char *Data)
759{
760
761 const unsigned char *in = (const unsigned char *)Data;
762 // The decoded size will be at most 3/4 the size of the encoded
763 unsigned long ch = 0;
764 int i = 0;
765
766 while (*in) {
767 int t = *in++;
768
769 if (t >= '0' && t <= '9')
770 t = t - '0' + 52;
771 else if (t >= 'A' && t <= 'Z')
772 t = t - 'A';
773 else if (t >= 'a' && t <= 'z')
774 t = t - 'a' + 26;
775 else if (t == '+')
776 t = 62;
777 else if (t == '/')
778 t = 63;
779 else if (t == '=')
780 t = 0;
781 else
782 continue;
783
784 ch = (ch << 6) | t;
785 i++;
786 if (i == 4) {
787 *Data++ = (char) (ch >> 16);
788 *Data++ = (char) (ch >> 8);
789 *Data++ = (char) ch;
790 i = 0;
791 }
792 }
793 *Data = 0;
794}
795#endif
796
797
798/****************************************************************************
799 *
800 > $Function: openServer()
801 *
802 * $Description: create a listen server socket on the designated port.
803 *
804 * $Return: (int) . . . A connection socket. -1 for errors.
805 *
806 * $Errors: None
807 *
808 ****************************************************************************/
809static int openServer(void)
810{
811 struct sockaddr_in lsocket;
812 int fd;
813
814 /* create the socket right now */
815 /* inet_addr() returns a value that is already in network order */
816 memset(&lsocket, 0, sizeof(lsocket));
817 lsocket.sin_family = AF_INET;
818 lsocket.sin_addr.s_addr = INADDR_ANY;
819 lsocket.sin_port = htons(config->port);
820 fd = xsocket(AF_INET, SOCK_STREAM, 0);
821 /* tell the OS it's OK to reuse a previous address even though */
822 /* it may still be in a close down state. Allows bind to succeed. */
823#ifdef SO_REUSEPORT
824 {
825 static const int on = 1;
826 setsockopt(fd, SOL_SOCKET, SO_REUSEPORT,
827 (void *)&on, sizeof(on));
828 }
829#else
830 setsockopt_reuseaddr(fd);
831#endif
832 xbind(fd, (struct sockaddr *)&lsocket, sizeof(lsocket));
833 xlisten(fd, 9);
834 signal(SIGCHLD, SIG_IGN); /* prevent zombie (defunct) processes */
835 return fd;
836}
837
838/****************************************************************************
839 *
840 > $Function: sendHeaders()
841 *
842 * $Description: Create and send HTTP response headers.
843 * The arguments are combined and sent as one write operation. Note that
844 * IE will puke big-time if the headers are not sent in one packet and the
845 * second packet is delayed for any reason.
846 *
847 * $Parameter:
848 * (HttpResponseNum) responseNum . . . The result code to send.
849 *
850 * $Return: (int) . . . . writing errors
851 *
852 ****************************************************************************/
853static int sendHeaders(HttpResponseNum responseNum)
854{
855 char *buf = config->buf;
856 const char *responseString = "";
857 const char *infoString = 0;
858 const char *mime_type;
859 unsigned int i;
860 time_t timer = time(0);
861 char timeStr[80];
862 int len;
863 enum {
864 numNames = sizeof(httpResponseNames) / sizeof(httpResponseNames[0])
865 };
866
867 for (i = 0; i < numNames; i++) {
868 if (httpResponseNames[i].type == responseNum) {
869 responseString = httpResponseNames[i].name;
870 infoString = httpResponseNames[i].info;
871 break;
872 }
873 }
874 /* error message is HTML */
875 mime_type = responseNum == HTTP_OK ?
876 config->found_mime_type : "text/html";
877
878 /* emit the current date */
879 strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&timer));
880 len = sprintf(buf,
881 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
882 "Date: %s\r\nConnection: close\r\n",
883 responseNum, responseString, mime_type, timeStr);
884
885#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
886 if (responseNum == HTTP_UNAUTHORIZED) {
887 len += sprintf(buf+len, "WWW-Authenticate: Basic realm=\"%s\"\r\n",
888 config->realm);
889 }
890#endif
891 if (responseNum == HTTP_MOVED_TEMPORARILY) {
892 len += sprintf(buf+len, "Location: %s/%s%s\r\n",
893 config->found_moved_temporarily,
894 (config->query ? "?" : ""),
895 (config->query ? config->query : ""));
896 }
897
898 if (config->ContentLength != -1) { /* file */
899 strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&config->last_mod));
900 len += sprintf(buf+len, "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
901 timeStr, "Content-length:", config->ContentLength);
902 }
903 strcat(buf, "\r\n");
904 len += 2;
905 if (infoString) {
906 len += sprintf(buf+len,
907 "<HEAD><TITLE>%d %s</TITLE></HEAD>\n"
908 "<BODY><H1>%d %s</H1>\n%s\n</BODY>\n",
909 responseNum, responseString,
910 responseNum, responseString, infoString);
911 }
912 if (DEBUG)
913 fprintf(stderr, "headers: '%s'\n", buf);
914 return full_write(config->accepted_socket, buf, len);
915}
916
917/****************************************************************************
918 *
919 > $Function: getLine()
920 *
921 * $Description: Read from the socket until an end of line char found.
922 *
923 * Characters are read one at a time until an eol sequence is found.
924 *
925 * $Return: (int) . . . . number of characters read. -1 if error.
926 *
927 ****************************************************************************/
928static int getLine(void)
929{
930 int count = 0;
931 char *buf = config->buf;
932
933 while (read(config->accepted_socket, buf + count, 1) == 1) {
934 if (buf[count] == '\r') continue;
935 if (buf[count] == '\n') {
936 buf[count] = 0;
937 return count;
938 }
939 if (count < (MAX_MEMORY_BUFF-1)) /* check overflow */
940 count++;
941 }
942 if (count) return count;
943 else return -1;
944}
945
946#if ENABLE_FEATURE_HTTPD_CGI
947/****************************************************************************
948 *
949 > $Function: sendCgi()
950 *
951 * $Description: Execute a CGI script and send it's stdout back
952 *
953 * Environment variables are set up and the script is invoked with pipes
954 * for stdin/stdout. If a post is being done the script is fed the POST
955 * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
956 *
957 * $Parameters:
958 * (const char *) url . . . . . . The requested URL (with leading /).
959 * (int bodyLen) . . . . . . . . Length of the post body.
960 * (const char *cookie) . . . . . For set HTTP_COOKIE.
961 * (const char *content_type) . . For set CONTENT_TYPE.
962
963 *
964 * $Return: (char *) . . . . A pointer to the decoded string (same as input).
965 *
966 * $Errors: None
967 *
968 ****************************************************************************/
969static int sendCgi(const char *url,
970 const char *request, int bodyLen, const char *cookie,
971 const char *content_type)
972{
973 int fromCgi[2]; /* pipe for reading data from CGI */
974 int toCgi[2]; /* pipe for sending data to CGI */
975
976 static char * argp[] = { 0, 0 };
977 int pid = 0;
978 int inFd;
979 int outFd;
980 int firstLine = 1;
981 int status;
982 size_t post_readed_size, post_readed_idx;
983
984 if (pipe(fromCgi) != 0)
985 return 0;
986 if (pipe(toCgi) != 0)
987 return 0;
988
989 pid = fork();
990 if (pid < 0)
991 return 0;
992
993 if (!pid) {
994 /* child process */
995 char *script;
996 char *purl = strdup(url);
997 char realpath_buff[MAXPATHLEN];
998
999 if (purl == NULL)
1000 _exit(242);
1001
1002 inFd = toCgi[0];
1003 outFd = fromCgi[1];
1004
1005 dup2(inFd, 0); // replace stdin with the pipe
1006 dup2(outFd, 1); // replace stdout with the pipe
1007 if (!DEBUG)
1008 dup2(outFd, 2); // replace stderr with the pipe
1009
1010 close(toCgi[0]);
1011 close(toCgi[1]);
1012 close(fromCgi[0]);
1013 close(fromCgi[1]);
1014
1015 close(config->accepted_socket);
1016 close(config->server_socket);
1017
1018 /*
1019 * Find PATH_INFO.
1020 */
1021 script = purl;
1022 while ((script = strchr(script + 1, '/')) != NULL) {
1023 /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
1024 struct stat sb;
1025
1026 *script = '\0';
1027 if (is_directory(purl + 1, 1, &sb) == 0) {
1028 /* not directory, found script.cgi/PATH_INFO */
1029 *script = '/';
1030 break;
1031 }
1032 *script = '/'; /* is directory, find next '/' */
1033 }
1034 setenv1("PATH_INFO", script); /* set /PATH_INFO or "" */
1035 /* setenv1("PATH", getenv("PATH")); redundant */
1036 setenv1("REQUEST_METHOD", request);
1037 if (config->query) {
1038 char *uri = alloca(strlen(purl) + 2 + strlen(config->query));
1039 if (uri)
1040 sprintf(uri, "%s?%s", purl, config->query);
1041 setenv1("REQUEST_URI", uri);
1042 } else {
1043 setenv1("REQUEST_URI", purl);
1044 }
1045 if (script != NULL)
1046 *script = '\0'; /* cut off /PATH_INFO */
1047 /* SCRIPT_FILENAME required by PHP in CGI mode */
1048 if (!realpath(purl + 1, realpath_buff))
1049 goto error_execing_cgi;
1050 setenv1("SCRIPT_FILENAME", realpath_buff);
1051 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1052 setenv1("SCRIPT_NAME", purl);
1053 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1054 * QUERY_STRING: The information which follows the ? in the URL
1055 * which referenced this script. This is the query information.
1056 * It should not be decoded in any fashion. This variable
1057 * should always be set when there is query information,
1058 * regardless of command line decoding. */
1059 /* (Older versions of bbox seemed to do some decoding) */
1060 setenv1("QUERY_STRING", config->query);
1061 setenv1("SERVER_SOFTWARE", httpdVersion);
1062 putenv("SERVER_PROTOCOL=HTTP/1.0");
1063 putenv("GATEWAY_INTERFACE=CGI/1.1");
1064 setenv1("REMOTE_ADDR", config->rmt_ip_str);
1065#if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1066 setenv_long("REMOTE_PORT", config->port);
1067#endif
1068 if (bodyLen)
1069 setenv_long("CONTENT_LENGTH", bodyLen);
1070 if (cookie)
1071 setenv1("HTTP_COOKIE", cookie);
1072 if (content_type)
1073 setenv1("CONTENT_TYPE", content_type);
1074#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1075 if (config->remoteuser) {
1076 setenv1("REMOTE_USER", config->remoteuser);
1077 putenv("AUTH_TYPE=Basic");
1078 }
1079#endif
1080 if (config->referer)
1081 setenv1("HTTP_REFERER", config->referer);
1082
1083 /* set execve argp[0] without path */
1084 argp[0] = strrchr(purl, '/') + 1;
1085 /* but script argp[0] must have absolute path and chdiring to this */
1086 script = strrchr(realpath_buff, '/');
1087 if (!script)
1088 goto error_execing_cgi;
1089 *script = '\0';
1090 if (chdir(realpath_buff) == 0) {
1091 // now run the program. If it fails,
1092 // use _exit() so no destructors
1093 // get called and make a mess.
1094#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1095 char *interpr = NULL;
1096 char *suffix = strrchr(purl, '.');
1097
1098 if (suffix) {
1099 Htaccess *cur;
1100 for (cur = config->script_i; cur; cur = cur->next) {
1101 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1102 interpr = cur->after_colon;
1103 break;
1104 }
1105 }
1106 }
1107#endif
1108 *script = '/';
1109#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1110 if (interpr)
1111 execv(interpr, argp);
1112 else
1113#endif
1114 execv(realpath_buff, argp);
1115 }
1116 error_execing_cgi:
1117 /* send to stdout (even if we are not from inetd) */
1118 config->accepted_socket = 1;
1119 sendHeaders(HTTP_NOT_FOUND);
1120 _exit(242);
1121 } /* end child */
1122
1123 /* parent process */
1124
1125 post_readed_size = 0;
1126 post_readed_idx = 0;
1127 inFd = fromCgi[0];
1128 outFd = toCgi[1];
1129 close(fromCgi[1]);
1130 close(toCgi[0]);
1131 signal(SIGPIPE, SIG_IGN);
1132
1133 while (1) {
1134 fd_set readSet;
1135 fd_set writeSet;
1136 char wbuf[128];
1137 int nfound;
1138 int count;
1139
1140 FD_ZERO(&readSet);
1141 FD_ZERO(&writeSet);
1142 FD_SET(inFd, &readSet);
1143 if (bodyLen > 0 || post_readed_size > 0) {
1144 FD_SET(outFd, &writeSet);
1145 nfound = outFd > inFd ? outFd : inFd;
1146 if (post_readed_size == 0) {
1147 FD_SET(config->accepted_socket, &readSet);
1148 if (nfound < config->accepted_socket)
1149 nfound = config->accepted_socket;
1150 }
1151 /* Now wait on the set of sockets! */
1152 nfound = select(nfound + 1, &readSet, &writeSet, 0, NULL);
1153 } else {
1154 if (!bodyLen) {
1155 close(outFd);
1156 bodyLen = -1;
1157 }
1158 nfound = select(inFd + 1, &readSet, 0, 0, NULL);
1159 }
1160
1161 if (nfound <= 0) {
1162 if (waitpid(pid, &status, WNOHANG) > 0) {
1163 close(inFd);
1164 if (DEBUG && WIFEXITED(status))
1165 bb_error_msg("piped has exited with status=%d", WEXITSTATUS(status));
1166 if (DEBUG && WIFSIGNALED(status))
1167 bb_error_msg("piped has exited with signal=%d", WTERMSIG(status));
1168 break;
1169 }
1170 } else if (post_readed_size > 0 && FD_ISSET(outFd, &writeSet)) {
1171 count = full_write(outFd, wbuf + post_readed_idx, post_readed_size);
1172 if (count > 0) {
1173 post_readed_size -= count;
1174 post_readed_idx += count;
1175 if (post_readed_size == 0)
1176 post_readed_idx = 0;
1177 } else {
1178 post_readed_size = post_readed_idx = bodyLen = 0; /* broken pipe to CGI */
1179 }
1180 } else if (bodyLen > 0 && post_readed_size == 0 && FD_ISSET(config->accepted_socket, &readSet)) {
1181 count = bodyLen > (int)sizeof(wbuf) ? (int)sizeof(wbuf) : bodyLen;
1182 count = safe_read(config->accepted_socket, wbuf, count);
1183 if (count > 0) {
1184 post_readed_size += count;
1185 bodyLen -= count;
1186 } else {
1187 bodyLen = 0; /* closed */
1188 }
1189 }
1190 if (FD_ISSET(inFd, &readSet)) {
1191 int s = config->accepted_socket;
1192 char *rbuf = config->buf;
1193
1194#ifndef PIPE_BUF
1195# define PIPESIZE 4096 /* amount of buffering in a pipe */
1196#else
1197# define PIPESIZE PIPE_BUF
1198#endif
1199#if PIPESIZE >= MAX_MEMORY_BUFF
1200# error "PIPESIZE >= MAX_MEMORY_BUFF"
1201#endif
1202
1203 /* There is something to read */
1204 count = safe_read(inFd, rbuf, PIPESIZE);
1205 if (count == 0)
1206 break; /* closed */
1207 if (count > 0) {
1208 if (firstLine) {
1209 rbuf[count] = 0;
1210 /* check to see if the user script added headers */
1211 if (strncmp(rbuf, "HTTP/1.0 200 OK\r\n", 4) != 0) {
1212 full_write(s, "HTTP/1.0 200 OK\r\n", 17);
1213 }
1214 /* Sometimes CGI is writing to pipe in small chunks
1215 * and we don't see Content-type (because the read
1216 * is too short) and we emit bogus "text/plain"!
1217 * Is it a bug or CGI *has to* write it in one piece? */
1218 if (strstr(rbuf, "ontent-") == 0) {
1219 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1220 }
1221 firstLine = 0;
1222 }
1223 if (full_write(s, rbuf, count) != count)
1224 break;
1225
1226 if (DEBUG)
1227 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1228 }
1229 }
1230 }
1231 return 0;
1232}
1233#endif /* FEATURE_HTTPD_CGI */
1234
1235/****************************************************************************
1236 *
1237 > $Function: sendFile()
1238 *
1239 * $Description: Send a file response to a HTTP request
1240 *
1241 * $Parameter:
1242 * (const char *) url . . The URL requested.
1243 *
1244 * $Return: (int) . . . . . . Always 0.
1245 *
1246 ****************************************************************************/
1247static int sendFile(const char *url)
1248{
1249 char * suffix;
1250 int f;
1251 const char * const * table;
1252 const char * try_suffix;
1253
1254 suffix = strrchr(url, '.');
1255
1256 for (table = suffixTable; *table; table += 2)
1257 if (suffix != NULL && (try_suffix = strstr(*table, suffix)) != 0) {
1258 try_suffix += strlen(suffix);
1259 if (*try_suffix == 0 || *try_suffix == '.')
1260 break;
1261 }
1262 /* also, if not found, set default as "application/octet-stream"; */
1263 config->found_mime_type = table[1];
1264#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1265 if (suffix) {
1266 Htaccess * cur;
1267
1268 for (cur = config->mime_a; cur; cur = cur->next) {
1269 if (strcmp(cur->before_colon, suffix) == 0) {
1270 config->found_mime_type = cur->after_colon;
1271 break;
1272 }
1273 }
1274 }
1275#endif /* FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */
1276
1277 if (DEBUG)
1278 fprintf(stderr, "sending file '%s' content-type: %s\n",
1279 url, config->found_mime_type);
1280
1281 f = open(url, O_RDONLY);
1282 if (f >= 0) {
1283 int count;
1284 char *buf = config->buf;
1285
1286 sendHeaders(HTTP_OK);
1287 /* TODO: sendfile() */
1288 while ((count = full_read(f, buf, MAX_MEMORY_BUFF)) > 0) {
1289 if (full_write(config->accepted_socket, buf, count) != count)
1290 break;
1291 }
1292 close(f);
1293 } else {
1294 if (DEBUG)
1295 bb_perror_msg("cannot open '%s'", url);
1296 sendHeaders(HTTP_NOT_FOUND);
1297 }
1298
1299 return 0;
1300}
1301
1302static int checkPermIP(void)
1303{
1304 Htaccess_IP * cur;
1305
1306 /* This could stand some work */
1307 for (cur = config->ip_a_d; cur; cur = cur->next) {
1308 if (DEBUG)
1309 fprintf(stderr, "checkPermIP: '%s' ? ", config->rmt_ip_str);
1310 if (DEBUG)
1311 fprintf(stderr, "'%u.%u.%u.%u/%u.%u.%u.%u'\n",
1312 (unsigned char)(cur->ip >> 24),
1313 (unsigned char)(cur->ip >> 16),
1314 (unsigned char)(cur->ip >> 8),
1315 cur->ip & 0xff,
1316 (unsigned char)(cur->mask >> 24),
1317 (unsigned char)(cur->mask >> 16),
1318 (unsigned char)(cur->mask >> 8),
1319 cur->mask & 0xff);
1320 if ((config->rmt_ip & cur->mask) == cur->ip)
1321 return cur->allow_deny == 'A'; /* Allow/Deny */
1322 }
1323
1324 /* if unconfigured, return 1 - access from all */
1325 return !config->flg_deny_all;
1326}
1327
1328/****************************************************************************
1329 *
1330 > $Function: checkPerm()
1331 *
1332 * $Description: Check the permission file for access password protected.
1333 *
1334 * If config file isn't present, everything is allowed.
1335 * Entries are of the form you can see example from header source
1336 *
1337 * $Parameters:
1338 * (const char *) path . . . . The file path.
1339 * (const char *) request . . . User information to validate.
1340 *
1341 * $Return: (int) . . . . . . . . . 1 if request OK, 0 otherwise.
1342 *
1343 ****************************************************************************/
1344
1345#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1346static int checkPerm(const char *path, const char *request)
1347{
1348 Htaccess * cur;
1349 const char *p;
1350 const char *p0;
1351
1352 const char *prev = NULL;
1353
1354 /* This could stand some work */
1355 for (cur = config->auth; cur; cur = cur->next) {
1356 size_t l;
1357
1358 p0 = cur->before_colon;
1359 if (prev != NULL && strcmp(prev, p0) != 0)
1360 continue; /* find next identical */
1361 p = cur->after_colon;
1362 if (DEBUG)
1363 fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
1364
1365 l = strlen(p0);
1366 if (strncmp(p0, path, l) == 0
1367 && (l == 1 || path[l] == '/' || path[l] == '\0')
1368 ) {
1369 char *u;
1370 /* path match found. Check request */
1371 /* for check next /path:user:password */
1372 prev = p0;
1373 u = strchr(request, ':');
1374 if (u == NULL) {
1375 /* bad request, ':' required */
1376 break;
1377 }
1378
1379 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1380 char *cipher;
1381 char *pp;
1382
1383 if (strncmp(p, request, u-request) != 0) {
1384 /* user uncompared */
1385 continue;
1386 }
1387 pp = strchr(p, ':');
1388 if (pp && pp[1] == '$' && pp[2] == '1' &&
1389 pp[3] == '$' && pp[4]) {
1390 pp++;
1391 cipher = pw_encrypt(u+1, pp);
1392 if (strcmp(cipher, pp) == 0)
1393 goto set_remoteuser_var; /* Ok */
1394 /* unauthorized */
1395 continue;
1396 }
1397 }
1398
1399 if (strcmp(p, request) == 0) {
1400set_remoteuser_var:
1401 config->remoteuser = strdup(request);
1402 if (config->remoteuser)
1403 config->remoteuser[(u - request)] = 0;
1404 return 1; /* Ok */
1405 }
1406 /* unauthorized */
1407 }
1408 } /* for */
1409
1410 return prev == NULL;
1411}
1412
1413#endif /* FEATURE_HTTPD_BASIC_AUTH */
1414
1415/****************************************************************************
1416 *
1417 > $Function: handle_sigalrm()
1418 *
1419 * $Description: Handle timeouts
1420 *
1421 ****************************************************************************/
1422
1423static void handle_sigalrm(int sig)
1424{
1425 sendHeaders(HTTP_REQUEST_TIMEOUT);
1426 config->alarm_signaled = sig;
1427}
1428
1429/****************************************************************************
1430 *
1431 > $Function: handleIncoming()
1432 *
1433 * $Description: Handle an incoming http request.
1434 *
1435 ****************************************************************************/
1436static void handleIncoming(void)
1437{
1438 char *buf = config->buf;
1439 char *url;
1440 char *purl;
1441 int blank = -1;
1442 char *test;
1443 struct stat sb;
1444 int ip_allowed;
1445#if ENABLE_FEATURE_HTTPD_CGI
1446 const char *prequest = request_GET;
1447 unsigned long length = 0;
1448 char *cookie = 0;
1449 char *content_type = 0;
1450#endif
1451 fd_set s_fd;
1452 struct timeval tv;
1453 int retval;
1454 struct sigaction sa;
1455
1456#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1457 int credentials = -1; /* if not required this is Ok */
1458#endif
1459
1460 sa.sa_handler = handle_sigalrm;
1461 sigemptyset(&sa.sa_mask);
1462 sa.sa_flags = 0; /* no SA_RESTART */
1463 sigaction(SIGALRM, &sa, NULL);
1464
1465 do {
1466 int count;
1467
1468 (void) alarm(TIMEOUT);
1469 if (getLine() <= 0)
1470 break; /* closed */
1471
1472 purl = strpbrk(buf, " \t");
1473 if (purl == NULL) {
1474 BAD_REQUEST:
1475 sendHeaders(HTTP_BAD_REQUEST);
1476 break;
1477 }
1478 *purl = '\0';
1479#if ENABLE_FEATURE_HTTPD_CGI
1480 if (strcasecmp(buf, prequest) != 0) {
1481 prequest = "POST";
1482 if (strcasecmp(buf, prequest) != 0) {
1483 sendHeaders(HTTP_NOT_IMPLEMENTED);
1484 break;
1485 }
1486 }
1487#else
1488 if (strcasecmp(buf, request_GET) != 0) {
1489 sendHeaders(HTTP_NOT_IMPLEMENTED);
1490 break;
1491 }
1492#endif
1493 *purl = ' ';
1494 count = sscanf(purl, " %[^ ] HTTP/%d.%*d", buf, &blank);
1495
1496 if (count < 1 || buf[0] != '/') {
1497 /* Garbled request/URL */
1498 goto BAD_REQUEST;
1499 }
1500 url = alloca(strlen(buf) + sizeof("/index.html"));
1501 if (url == NULL) {
1502 sendHeaders(HTTP_INTERNAL_SERVER_ERROR);
1503 break;
1504 }
1505 strcpy(url, buf);
1506 /* extract url args if present */
1507 test = strchr(url, '?');
1508 config->query = NULL;
1509 if (test) {
1510 *test++ = '\0';
1511 config->query = test;
1512 }
1513
1514 test = decodeString(url, 0);
1515 if (test == NULL)
1516 goto BAD_REQUEST;
1517 if (test == url+1) {
1518 /* '/' or NUL is encoded */
1519 sendHeaders(HTTP_NOT_FOUND);
1520 break;
1521 }
1522
1523 /* algorithm stolen from libbb bb_simplify_path(),
1524 but don't strdup and reducing trailing slash and protect out root */
1525 purl = test = url;
1526 do {
1527 if (*purl == '/') {
1528 /* skip duplicate (or initial) slash */
1529 if (*test == '/') {
1530 continue;
1531 }
1532 if (*test == '.') {
1533 /* skip extra '.' */
1534 if (test[1] == '/' || test[1] == 0) {
1535 continue;
1536 } else
1537 /* '..': be careful */
1538 if (test[1] == '.' && (test[2] == '/' || test[2] == 0)) {
1539 ++test;
1540 if (purl == url) {
1541 /* protect out root */
1542 goto BAD_REQUEST;
1543 }
1544 while (*--purl != '/') /* omit previous dir */;
1545 continue;
1546 }
1547 }
1548 }
1549 *++purl = *test;
1550 } while (*++test);
1551 *++purl = '\0'; /* so keep last character */
1552 test = purl; /* end ptr */
1553
1554 /* If URL is directory, adding '/' */
1555 if (test[-1] != '/') {
1556 if (is_directory(url + 1, 1, &sb)) {
1557 config->found_moved_temporarily = url;
1558 }
1559 }
1560 if (DEBUG)
1561 fprintf(stderr, "url='%s', args=%s\n", url, config->query);
1562
1563 test = url;
1564 ip_allowed = checkPermIP();
1565 while (ip_allowed && (test = strchr(test + 1, '/')) != NULL) {
1566 /* have path1/path2 */
1567 *test = '\0';
1568 if (is_directory(url + 1, 1, &sb)) {
1569 /* may be having subdir config */
1570 parse_conf(url + 1, SUBDIR_PARSE);
1571 ip_allowed = checkPermIP();
1572 }
1573 *test = '/';
1574 }
1575 if (blank >= 0) {
1576 /* read until blank line for HTTP version specified, else parse immediate */
1577 while (1) {
1578 alarm(TIMEOUT);
1579 count = getLine();
1580 if (count <= 0)
1581 break;
1582
1583 if (DEBUG)
1584 fprintf(stderr, "header: '%s'\n", buf);
1585
1586#if ENABLE_FEATURE_HTTPD_CGI
1587 /* try and do our best to parse more lines */
1588 if ((STRNCASECMP(buf, "Content-length:") == 0)) {
1589 /* extra read only for POST */
1590 if (prequest != request_GET) {
1591 test = buf + sizeof("Content-length:")-1;
1592 if (!test[0]) goto bail_out;
1593 errno = 0;
1594 /* not using strtoul: it ignores leading munis! */
1595 length = strtol(test, &test, 10);
1596 /* length is "ulong", but we need to pass it to int later */
1597 /* so we check for negative or too large values in one go: */
1598 /* (long -> ulong conv caused negatives to be seen as > INT_MAX) */
1599 if (test[0] || errno || length > INT_MAX)
1600 goto bail_out;
1601 }
1602 } else if ((STRNCASECMP(buf, "Cookie:") == 0)) {
1603 cookie = strdup(skip_whitespace(buf + sizeof("Cookie:")-1));
1604 } else if ((STRNCASECMP(buf, "Content-Type:") == 0)) {
1605 content_type = strdup(skip_whitespace(buf + sizeof("Content-Type:")-1));
1606 } else if ((STRNCASECMP(buf, "Referer:") == 0)) {
1607 config->referer = strdup(skip_whitespace(buf + sizeof("Referer:")-1));
1608 }
1609#endif
1610
1611#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1612 if (STRNCASECMP(buf, "Authorization:") == 0) {
1613 /* We only allow Basic credentials.
1614 * It shows up as "Authorization: Basic <userid:password>" where
1615 * the userid:password is base64 encoded.
1616 */
1617 test = skip_whitespace(buf + sizeof("Authorization:")-1);
1618 if (STRNCASECMP(test, "Basic") != 0)
1619 continue;
1620 test += sizeof("Basic")-1;
1621 /* decodeBase64() skips whitespace itself */
1622 decodeBase64(test);
1623 credentials = checkPerm(url, test);
1624 }
1625#endif /* FEATURE_HTTPD_BASIC_AUTH */
1626
1627 } /* while extra header reading */
1628 }
1629 alarm(0);
1630 if (config->alarm_signaled)
1631 break;
1632
1633 if (strcmp(strrchr(url, '/') + 1, httpd_conf) == 0 || ip_allowed == 0) {
1634 /* protect listing [/path]/httpd_conf or IP deny */
1635#if ENABLE_FEATURE_HTTPD_CGI
1636 FORBIDDEN: /* protect listing /cgi-bin */
1637#endif
1638 sendHeaders(HTTP_FORBIDDEN);
1639 break;
1640 }
1641
1642#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1643 if (credentials <= 0 && checkPerm(url, ":") == 0) {
1644 sendHeaders(HTTP_UNAUTHORIZED);
1645 break;
1646 }
1647#endif
1648
1649 if (config->found_moved_temporarily) {
1650 sendHeaders(HTTP_MOVED_TEMPORARILY);
1651 /* clear unforked memory flag */
1652 config->found_moved_temporarily = NULL;
1653 break;
1654 }
1655
1656 test = url + 1; /* skip first '/' */
1657
1658#if ENABLE_FEATURE_HTTPD_CGI
1659 if (strncmp(test, "cgi-bin", 7) == 0) {
1660 if (test[7] == '/' && test[8] == 0)
1661 goto FORBIDDEN; /* protect listing cgi-bin/ */
1662 sendCgi(url, prequest, length, cookie, content_type);
1663 break;
1664 }
1665 if (prequest != request_GET) {
1666 sendHeaders(HTTP_NOT_IMPLEMENTED);
1667 break;
1668 }
1669#endif /* FEATURE_HTTPD_CGI */
1670 if (purl[-1] == '/')
1671 strcpy(purl, "index.html");
1672 if (stat(test, &sb) == 0) {
1673 /* It's a dir URL and there is index.html */
1674 config->ContentLength = sb.st_size;
1675 config->last_mod = sb.st_mtime;
1676 }
1677#if ENABLE_FEATURE_HTTPD_CGI
1678 else if (purl[-1] == '/') {
1679 /* It's a dir URL and there is no index.html
1680 * Try cgi-bin/index.cgi */
1681 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
1682 purl[0] = '\0';
1683 config->query = url;
1684 sendCgi("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
1685 break;
1686 }
1687 }
1688#endif /* FEATURE_HTTPD_CGI */
1689 sendFile(test);
1690 config->ContentLength = -1;
1691 } while (0);
1692
1693 bail_out:
1694
1695 if (DEBUG)
1696 fprintf(stderr, "closing socket\n\n");
1697#if ENABLE_FEATURE_HTTPD_CGI
1698 free(cookie);
1699 free(content_type);
1700 free(config->referer);
1701 config->referer = NULL;
1702# if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1703 free(config->remoteuser);
1704 config->remoteuser = NULL;
1705# endif
1706#endif
1707 shutdown(config->accepted_socket, SHUT_WR);
1708
1709 /* Properly wait for remote to closed */
1710 FD_ZERO(&s_fd);
1711 FD_SET(config->accepted_socket, &s_fd);
1712
1713 do {
1714 tv.tv_sec = 2;
1715 tv.tv_usec = 0;
1716 retval = select(config->accepted_socket + 1, &s_fd, NULL, NULL, &tv);
1717 } while (retval > 0 && read(config->accepted_socket, buf, sizeof(config->buf) > 0));
1718
1719 shutdown(config->accepted_socket, SHUT_RD);
1720 /* In inetd case, we close fd 1 (stdout) here. We will exit soon anyway */
1721 close(config->accepted_socket);
1722}
1723
1724/****************************************************************************
1725 *
1726 > $Function: miniHttpd()
1727 *
1728 * $Description: The main http server function.
1729 *
1730 * Given an open socket fildes, listen for new connections and farm out
1731 * the processing as a forked process.
1732 *
1733 * $Parameters:
1734 * (int) server. . . The server socket fildes.
1735 *
1736 * $Return: (int) . . . . Always 0.
1737 *
1738 ****************************************************************************/
1739static int miniHttpd(int server)
1740{
1741 fd_set readfd, portfd;
1742
1743 FD_ZERO(&portfd);
1744 FD_SET(server, &portfd);
1745
1746 /* copy the ports we are watching to the readfd set */
1747 while (1) {
1748 int on, s;
1749 socklen_t fromAddrLen;
1750 struct sockaddr_in fromAddr;
1751
1752 /* Now wait INDEFINITELY on the set of sockets! */
1753 readfd = portfd;
1754 if (select(server + 1, &readfd, 0, 0, 0) <= 0)
1755 continue;
1756 if (!FD_ISSET(server, &readfd))
1757 continue;
1758 fromAddrLen = sizeof(fromAddr);
1759 s = accept(server, (struct sockaddr *)&fromAddr, &fromAddrLen);
1760 if (s < 0)
1761 continue;
1762 config->accepted_socket = s;
1763 config->rmt_ip = ntohl(fromAddr.sin_addr.s_addr);
1764#if ENABLE_FEATURE_HTTPD_CGI || DEBUG
1765 sprintf(config->rmt_ip_str, "%u.%u.%u.%u",
1766 (unsigned char)(config->rmt_ip >> 24),
1767 (unsigned char)(config->rmt_ip >> 16),
1768 (unsigned char)(config->rmt_ip >> 8),
1769 config->rmt_ip & 0xff);
1770 config->port = ntohs(fromAddr.sin_port);
1771#if DEBUG
1772 bb_error_msg("connection from IP=%s, port %u",
1773 config->rmt_ip_str, config->port);
1774#endif
1775#endif /* FEATURE_HTTPD_CGI */
1776
1777 /* set the KEEPALIVE option to cull dead connections */
1778 on = 1;
1779 setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, sizeof(on));
1780
1781 if (DEBUG || fork() == 0) {
1782 /* child */
1783#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1784 /* protect reload config, may be confuse checking */
1785 signal(SIGHUP, SIG_IGN);
1786#endif
1787 handleIncoming();
1788 if (!DEBUG)
1789 exit(0);
1790 }
1791 close(s);
1792 } /* while (1) */
1793 return 0;
1794}
1795
1796/* from inetd */
1797static int miniHttpd_inetd(void)
1798{
1799 struct sockaddr_in fromAddrLen;
1800 socklen_t sinlen = sizeof(struct sockaddr_in);
1801
1802 getpeername(0, (struct sockaddr *)&fromAddrLen, &sinlen);
1803 config->rmt_ip = ntohl(fromAddrLen.sin_addr.s_addr);
1804#if ENABLE_FEATURE_HTTPD_CGI
1805 sprintf(config->rmt_ip_str, "%u.%u.%u.%u",
1806 (unsigned char)(config->rmt_ip >> 24),
1807 (unsigned char)(config->rmt_ip >> 16),
1808 (unsigned char)(config->rmt_ip >> 8),
1809 config->rmt_ip & 0xff);
1810#endif
1811 config->port = ntohs(fromAddrLen.sin_port);
1812 handleIncoming();
1813 return 0;
1814}
1815
1816#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1817static void sighup_handler(int sig)
1818{
1819 /* set and reset */
1820 struct sigaction sa;
1821
1822 parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
1823 sa.sa_handler = sighup_handler;
1824 sigemptyset(&sa.sa_mask);
1825 sa.sa_flags = SA_RESTART;
1826 sigaction(SIGHUP, &sa, NULL);
1827}
1828#endif
1829
1830enum {
1831 c_opt_config_file = 0,
1832 d_opt_decode_url,
1833 h_opt_home_httpd,
1834 USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
1835 USE_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,)
1836 USE_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,)
1837 USE_FEATURE_HTTPD_SETUID( u_opt_setuid ,)
1838 p_opt_port ,
1839 p_opt_inetd ,
1840 p_opt_foreground,
1841 OPT_CONFIG_FILE = 1 << c_opt_config_file,
1842 OPT_DECODE_URL = 1 << d_opt_decode_url,
1843 OPT_HOME_HTTPD = 1 << h_opt_home_httpd,
1844 OPT_ENCODE_URL = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
1845 OPT_REALM = USE_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0,
1846 OPT_MD5 = USE_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0,
1847 OPT_SETUID = USE_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0,
1848 OPT_PORT = 1 << p_opt_port,
1849 OPT_INETD = 1 << p_opt_inetd,
1850 OPT_FOREGROUND = 1 << p_opt_foreground,
1851};
1852
1853static const char httpd_opts[] = "c:d:h:"
1854 USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
1855 USE_FEATURE_HTTPD_BASIC_AUTH("r:")
1856 USE_FEATURE_HTTPD_AUTH_MD5("m:")
1857 USE_FEATURE_HTTPD_SETUID("u:")
1858 "p:if";
1859
1860
1861int httpd_main(int argc, char *argv[])
1862{
1863 unsigned opt;
1864 const char *home_httpd = home;
1865 char *url_for_decode;
1866 USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
1867 const char *s_port;
1868 USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
1869 USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
1870 USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
1871
1872#if ENABLE_LOCALE_SUPPORT
1873 /* Undo busybox.c: we want to speak English in http (dates etc) */
1874 setlocale(LC_TIME, "C");
1875#endif
1876
1877 config = xzalloc(sizeof(*config));
1878#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1879 config->realm = "Web Server Authentication";
1880#endif
1881 config->port = 80;
1882 config->ContentLength = -1;
1883
1884 opt = getopt32(argc, argv, httpd_opts,
1885 &(config->configFile), &url_for_decode, &home_httpd
1886 USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
1887 USE_FEATURE_HTTPD_BASIC_AUTH(, &(config->realm))
1888 USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
1889 USE_FEATURE_HTTPD_SETUID(, &s_ugid)
1890 , &s_port
1891 );
1892 if (opt & OPT_DECODE_URL) {
1893 printf("%s", decodeString(url_for_decode, 1));
1894 return 0;
1895 }
1896#if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
1897 if (opt & OPT_ENCODE_URL) {
1898 printf("%s", encodeString(url_for_encode));
1899 return 0;
1900 }
1901#endif
1902#if ENABLE_FEATURE_HTTPD_AUTH_MD5
1903 if (opt & OPT_MD5) {
1904 puts(pw_encrypt(pass, "$1$"));
1905 return 0;
1906 }
1907#endif
1908 if (opt & OPT_PORT)
1909 config->port = xatou16(s_port);
1910
1911#if ENABLE_FEATURE_HTTPD_SETUID
1912 if (opt & OPT_SETUID) {
1913 char *e;
1914 // FIXME: what the default group should be?
1915 ugid.gid = -1;
1916 ugid.uid = bb_strtoul(s_ugid, &e, 0);
1917 if (*e == ':') {
1918 e++;
1919 ugid.gid = bb_strtoul(e, NULL, 0);
1920 }
1921 if (errno) {
1922 /* not integer */
1923 if (!uidgid_get(&ugid, s_ugid))
1924 bb_error_msg_and_die("unrecognized user[:group] "
1925 "name '%s'", s_ugid);
1926 }
1927 }
1928#endif
1929
1930 xchdir(home_httpd);
1931 if (!(opt & OPT_INETD)) {
1932 config->server_socket = openServer();
1933#if ENABLE_FEATURE_HTTPD_SETUID
1934 /* drop privileges */
1935 if (opt & OPT_SETUID) {
1936 if (ugid.gid != (gid_t)-1) {
1937 if (setgroups(1, &ugid.gid) == -1)
1938 bb_perror_msg_and_die("setgroups");
1939 xsetgid(ugid.gid);
1940 }
1941 xsetuid(ugid.uid);
1942 }
1943#endif
1944 }
1945
1946#if ENABLE_FEATURE_HTTPD_CGI
1947 {
1948 char *p = getenv("PATH");
1949 p = xstrdup(p); /* if gets NULL, returns NULL */
1950 clearenv();
1951 if (p)
1952 setenv1("PATH", p);
1953 if (!(opt & OPT_INETD))
1954 setenv_long("SERVER_PORT", config->port);
1955 }
1956#endif
1957
1958#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1959 sighup_handler(0);
1960#else
1961 parse_conf(default_path_httpd_conf, FIRST_PARSE);
1962#endif
1963
1964 if (opt & OPT_INETD)
1965 return miniHttpd_inetd();
1966
1967 if (!(opt & OPT_FOREGROUND))
1968 xdaemon(1, 0); /* don't change current directory */
1969 return miniHttpd(config->server_socket);
1970}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-14 11:25:29 +0000