2 * uhttpd - Tiny single-threaded httpd - Utility functions
4 * Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
19 #define _XOPEN_SOURCE 500 /* crypt() */
20 #define _BSD_SOURCE /* strcasecmp(), strncasecmp() */
23 #include "uhttpd-utils.h"
26 #include "uhttpd-tls.h"
30 static char *uh_index_files[] = {
38 const char * sa_straddr(void *sa)
40 static char str[INET6_ADDRSTRLEN];
41 struct sockaddr_in *v4 = (struct sockaddr_in *)sa;
42 struct sockaddr_in6 *v6 = (struct sockaddr_in6 *)sa;
44 if( v4->sin_family == AF_INET )
45 return inet_ntop(AF_INET, &(v4->sin_addr), str, sizeof(str));
47 return inet_ntop(AF_INET6, &(v6->sin6_addr), str, sizeof(str));
50 const char * sa_strport(void *sa)
53 snprintf(str, sizeof(str), "%i", sa_port(sa));
59 return ntohs(((struct sockaddr_in6 *)sa)->sin6_port);
62 /* Simple strstr() like function that takes len arguments for both haystack and needle. */
63 char *strfind(char *haystack, int hslen, const char *needle, int ndlen)
68 for( i = 0; i < hslen; i++ )
70 if( haystack[i] == needle[0] )
72 match = ((ndlen == 1) || ((i + ndlen) <= hslen));
74 for( j = 1; (j < ndlen) && ((i + j) < hslen); j++ )
76 if( haystack[i+j] != needle[j] )
91 /* interruptable select() */
92 int select_intr(int n, fd_set *r, fd_set *w, fd_set *e, struct timeval *t)
99 sigaddset(&ssn, SIGCHLD);
100 sigprocmask(SIG_UNBLOCK, &ssn, &sso);
102 rv = select(n, r, w, e, t);
104 /* restore signal mask */
105 sigprocmask(SIG_SETMASK, &sso, NULL);
111 int uh_tcp_send(struct client *cl, const char *buf, int len)
114 struct timeval timeout;
117 FD_SET(cl->socket, &writer);
119 timeout.tv_sec = cl->server->conf->network_timeout;
122 if( select(cl->socket + 1, NULL, &writer, NULL, &timeout) > 0 )
126 return cl->server->conf->tls_send(cl, (void *)buf, len);
129 return send(cl->socket, buf, len, 0);
135 int uh_tcp_peek(struct client *cl, char *buf, int len)
137 int sz = uh_tcp_recv(cl, buf, len);
139 /* store received data in peek buffer */
143 memcpy(cl->peekbuf, buf, sz);
149 int uh_tcp_recv(struct client *cl, char *buf, int len)
154 /* first serve data from peek buffer */
155 if( cl->peeklen > 0 )
157 sz = min(cl->peeklen, len);
158 len -= sz; cl->peeklen -= sz;
160 memcpy(buf, cl->peekbuf, sz);
161 memmove(cl->peekbuf, &cl->peekbuf[sz], cl->peeklen);
164 /* caller wants more */
169 rsz = cl->server->conf->tls_recv(cl, (void *)&buf[sz], len);
172 rsz = recv(cl->socket, (void *)&buf[sz], len, 0);
174 if( (sz == 0) || (rsz > 0) )
182 do { if( x < 0 ) return -1; } while(0)
184 int uh_http_sendhf(struct client *cl, int code, const char *summary, const char *fmt, ...)
188 char buffer[UH_LIMIT_MSGHEAD];
191 len = snprintf(buffer, sizeof(buffer),
192 "HTTP/1.1 %03i %s\r\n"
193 "Connection: close\r\n"
194 "Content-Type: text/plain\r\n"
195 "Transfer-Encoding: chunked\r\n\r\n",
199 ensure(uh_tcp_send(cl, buffer, len));
202 len = vsnprintf(buffer, sizeof(buffer), fmt, ap);
205 ensure(uh_http_sendc(cl, buffer, len));
206 ensure(uh_http_sendc(cl, NULL, 0));
212 int uh_http_sendc(struct client *cl, const char *data, int len)
222 clen = snprintf(chunk, sizeof(chunk), "%X\r\n", len);
223 ensure(uh_tcp_send(cl, chunk, clen));
224 ensure(uh_tcp_send(cl, data, len));
225 ensure(uh_tcp_send(cl, "\r\n", 2));
229 ensure(uh_tcp_send(cl, "0\r\n\r\n", 5));
236 struct client *cl, struct http_request *req, const char *fmt, ...
239 char buffer[UH_LIMIT_MSGHEAD];
243 len = vsnprintf(buffer, sizeof(buffer), fmt, ap);
246 if( (req != NULL) && (req->version > 1.0) )
247 ensure(uh_http_sendc(cl, buffer, len));
249 ensure(uh_tcp_send(cl, buffer, len));
255 struct client *cl, struct http_request *req, const char *buf, int len
260 if( (req != NULL) && (req->version > 1.0) )
261 ensure(uh_http_sendc(cl, buf, len));
263 ensure(uh_tcp_send(cl, buf, len));
269 int uh_urldecode(char *buf, int blen, const char *src, int slen)
275 (((x) <= '9') ? ((x) - '0') : \
276 (((x) <= 'F') ? ((x) - 'A' + 10) : \
279 for( i = 0; (i <= slen) && (i <= blen); i++ )
283 if( ((i+2) <= slen) && isxdigit(src[i+1]) && isxdigit(src[i+2]) )
285 buf[len++] = (char)(16 * hex(src[i+1]) + hex(src[i+2]));
302 int uh_urlencode(char *buf, int blen, const char *src, int slen)
306 const char hex[] = "0123456789abcdef";
308 for( i = 0; (i <= slen) && (i <= blen); i++ )
310 if( isalnum(src[i]) || (src[i] == '-') || (src[i] == '_') ||
311 (src[i] == '.') || (src[i] == '~') )
315 else if( (len+3) <= blen )
318 buf[len++] = hex[(src[i] >> 4) & 15];
319 buf[len++] = hex[(src[i] & 15) & 15];
330 int uh_b64decode(char *buf, int blen, const unsigned char *src, int slen)
335 unsigned int cin = 0;
336 unsigned int cout = 0;
339 for( i = 0; (i <= slen) && (src[i] != 0); i++ )
343 if( (cin >= '0') && (cin <= '9') )
344 cin = cin - '0' + 52;
345 else if( (cin >= 'A') && (cin <= 'Z') )
347 else if( (cin >= 'a') && (cin <= 'z') )
348 cin = cin - 'a' + 26;
349 else if( cin == '+' )
351 else if( cin == '/' )
353 else if( cin == '=' )
358 cout = (cout << 6) | cin;
362 if( (len + 3) < blen )
364 buf[len++] = (char)(cout >> 16);
365 buf[len++] = (char)(cout >> 8);
366 buf[len++] = (char)(cout);
379 static char * canonpath(const char *path, char *path_resolved)
381 char path_copy[PATH_MAX];
382 char *path_cpy = path_copy;
383 char *path_res = path_resolved;
388 /* relative -> absolute */
391 getcwd(path_copy, PATH_MAX);
392 strncat(path_copy, "/", PATH_MAX - strlen(path_copy));
393 strncat(path_copy, path, PATH_MAX - strlen(path_copy));
397 strncpy(path_copy, path, PATH_MAX);
401 while( (*path_cpy != '\0') && (path_cpy < (path_copy + PATH_MAX - 2)) )
403 if( *path_cpy == '/' )
405 /* skip repeating / */
406 if( path_cpy[1] == '/' )
413 else if( path_cpy[1] == '.' )
416 if( (path_cpy[2] == '/') || (path_cpy[2] == '\0') )
422 /* collapse /x/../ */
423 else if( (path_cpy[2] == '.') &&
424 ((path_cpy[3] == '/') || (path_cpy[3] == '\0'))
426 while( (path_res > path_resolved) && (*--path_res != '/') )
435 *path_res++ = *path_cpy++;
438 /* remove trailing slash if not root / */
439 if( (path_res > (path_resolved+1)) && (path_res[-1] == '/') )
441 else if( path_res == path_resolved )
447 if( !stat(path_resolved, &s) && (s.st_mode & S_IROTH) )
448 return path_resolved;
453 struct path_info * uh_path_lookup(struct client *cl, const char *url)
455 static char path_phys[PATH_MAX];
456 static char path_info[PATH_MAX];
457 static struct path_info p;
459 char buffer[UH_LIMIT_MSGHEAD];
460 char *docroot = cl->server->conf->docroot;
461 char *pathptr = NULL;
463 int no_sym = cl->server->conf->no_symlinks;
468 memset(path_phys, 0, sizeof(path_phys));
469 memset(path_info, 0, sizeof(path_info));
470 memset(buffer, 0, sizeof(buffer));
471 memset(&p, 0, sizeof(p));
474 memcpy(buffer, docroot,
475 min(strlen(docroot), sizeof(buffer) - 1));
477 /* separate query string from url */
478 if( (pathptr = strchr(url, '?')) != NULL )
480 p.query = pathptr[1] ? pathptr + 1 : NULL;
482 /* urldecode component w/o query */
485 &buffer[strlen(docroot)],
486 sizeof(buffer) - strlen(docroot) - 1,
487 url, (int)(pathptr - url) - 1
491 /* no query string, decode all of url */
495 &buffer[strlen(docroot)],
496 sizeof(buffer) - strlen(docroot) - 1,
501 /* create canon path */
502 for( i = strlen(buffer); i >= 0; i-- )
504 if( (buffer[i] == 0) || (buffer[i] == '/') )
506 memset(path_info, 0, sizeof(path_info));
507 memcpy(path_info, buffer, min(i + 1, sizeof(path_info) - 1));
509 if( no_sym ? realpath(path_info, path_phys)
510 : canonpath(path_info, path_phys)
512 memset(path_info, 0, sizeof(path_info));
513 memcpy(path_info, &buffer[i],
514 min(strlen(buffer) - i, sizeof(path_info) - 1));
521 /* check whether found path is within docroot */
522 if( strncmp(path_phys, docroot, strlen(docroot)) ||
523 ((path_phys[strlen(docroot)] != 0) &&
524 (path_phys[strlen(docroot)] != '/'))
529 /* test current path */
530 if( ! stat(path_phys, &p.stat) )
532 /* is a regular file */
533 if( p.stat.st_mode & S_IFREG )
537 p.name = &path_phys[strlen(docroot)];
538 p.info = path_info[0] ? path_info : NULL;
542 else if( (p.stat.st_mode & S_IFDIR) && !strlen(path_info) )
544 /* ensure trailing slash */
545 if( path_phys[strlen(path_phys)-1] != '/' )
546 path_phys[strlen(path_phys)] = '/';
548 /* try to locate index file */
549 memset(buffer, 0, sizeof(buffer));
550 memcpy(buffer, path_phys, sizeof(buffer));
551 pathptr = &buffer[strlen(buffer)];
553 for( i = 0; i < array_size(uh_index_files); i++ )
555 strncat(buffer, uh_index_files[i], sizeof(buffer));
557 if( !stat(buffer, &s) && (s.st_mode & S_IFREG) )
559 memcpy(path_phys, buffer, sizeof(path_phys));
560 memcpy(&p.stat, &s, sizeof(p.stat));
569 p.name = &path_phys[strlen(docroot)];
573 return p.phys ? &p : NULL;
577 static char uh_realms[UH_LIMIT_AUTHREALMS * sizeof(struct auth_realm)] = { 0 };
578 static int uh_realm_count = 0;
580 struct auth_realm * uh_auth_add(char *path, char *user, char *pass)
582 struct auth_realm *new = NULL;
586 if( uh_realm_count < UH_LIMIT_AUTHREALMS )
588 new = (struct auth_realm *)
589 &uh_realms[uh_realm_count * sizeof(struct auth_realm)];
591 memset(new, 0, sizeof(struct auth_realm));
593 memcpy(new->path, path,
594 min(strlen(path), sizeof(new->path) - 1));
596 memcpy(new->user, user,
597 min(strlen(user), sizeof(new->user) - 1));
599 /* given password refers to a passwd entry */
600 if( (strlen(pass) > 3) && !strncmp(pass, "$p$", 3) )
602 /* try to resolve shadow entry */
603 if( ((spwd = getspnam(&pass[3])) != NULL) && spwd->sp_pwdp )
605 memcpy(new->pass, spwd->sp_pwdp,
606 min(strlen(spwd->sp_pwdp), sizeof(new->pass) - 1));
609 /* try to resolve passwd entry */
610 else if( ((pwd = getpwnam(&pass[3])) != NULL) && pwd->pw_passwd &&
611 (pwd->pw_passwd[0] != '!') && (pwd->pw_passwd[0] != 0)
613 memcpy(new->pass, pwd->pw_passwd,
614 min(strlen(pwd->pw_passwd), sizeof(new->pass) - 1));
621 memcpy(new->pass, pass,
622 min(strlen(pass), sizeof(new->pass) - 1));
632 struct client *cl, struct http_request *req, struct path_info *pi
634 int i, plen, rlen, protected;
635 char buffer[UH_LIMIT_MSGHEAD];
639 struct auth_realm *realm = NULL;
641 plen = strlen(pi->name);
644 /* check whether at least one realm covers the requested url */
645 for( i = 0; i < uh_realm_count; i++ )
647 realm = (struct auth_realm *)
648 &uh_realms[i * sizeof(struct auth_realm)];
650 rlen = strlen(realm->path);
652 if( (plen >= rlen) && !strncasecmp(pi->name, realm->path, rlen) )
660 /* requested resource is covered by a realm */
663 /* try to get client auth info */
664 foreach_header(i, req->headers)
666 if( !strcasecmp(req->headers[i], "Authorization") &&
667 (strlen(req->headers[i+1]) > 6) &&
668 !strncasecmp(req->headers[i+1], "Basic ", 6)
670 memset(buffer, 0, sizeof(buffer));
671 uh_b64decode(buffer, sizeof(buffer) - 1,
672 (unsigned char *) &req->headers[i+1][6],
673 strlen(req->headers[i+1]) - 6);
675 if( (pass = strchr(buffer, ':')) != NULL )
685 /* have client auth */
688 /* find matching realm */
689 for( i = 0, realm = NULL; i < uh_realm_count; i++ )
691 realm = (struct auth_realm *)
692 &uh_realms[i * sizeof(struct auth_realm)];
694 rlen = strlen(realm->path);
696 if( (plen >= rlen) &&
697 !strncasecmp(pi->name, realm->path, rlen) &&
698 !strcmp(user, realm->user)
707 /* found a realm matching the username */
710 /* is a crypt passwd */
711 if( realm->pass[0] == '$' )
712 pass = crypt(pass, realm->pass);
714 /* check user pass */
715 if( !strcmp(pass, realm->pass) )
721 uh_http_sendf(cl, NULL,
722 "HTTP/%.1f 401 Authorization Required\r\n"
723 "WWW-Authenticate: Basic realm=\"%s\"\r\n"
724 "Content-Type: text/plain\r\n"
725 "Content-Length: 23\r\n\r\n"
726 "Authorization Required\n",
727 req->version, cl->server->conf->realm
737 static char uh_listeners[UH_LIMIT_LISTENERS * sizeof(struct listener)] = { 0 };
738 static char uh_clients[UH_LIMIT_CLIENTS * sizeof(struct client)] = { 0 };
740 static int uh_listener_count = 0;
741 static int uh_client_count = 0;
744 struct listener * uh_listener_add(int sock, struct config *conf)
746 struct listener *new = NULL;
749 if( uh_listener_count < UH_LIMIT_LISTENERS )
751 new = (struct listener *)
752 &uh_listeners[uh_listener_count * sizeof(struct listener)];
757 /* get local endpoint addr */
758 sl = sizeof(struct sockaddr_in6);
759 memset(&(new->addr), 0, sl);
760 getsockname(sock, (struct sockaddr *) &(new->addr), &sl);
768 struct listener * uh_listener_lookup(int sock)
770 struct listener *cur = NULL;
773 for( i = 0; i < uh_listener_count; i++ )
775 cur = (struct listener *) &uh_listeners[i * sizeof(struct listener)];
777 if( cur->socket == sock )
785 struct client * uh_client_add(int sock, struct listener *serv)
787 struct client *new = NULL;
790 if( uh_client_count < UH_LIMIT_CLIENTS )
792 new = (struct client *)
793 &uh_clients[uh_client_count * sizeof(struct client)];
798 /* get remote endpoint addr */
799 sl = sizeof(struct sockaddr_in6);
800 memset(&(new->peeraddr), 0, sl);
801 getpeername(sock, (struct sockaddr *) &(new->peeraddr), &sl);
803 /* get local endpoint addr */
804 sl = sizeof(struct sockaddr_in6);
805 memset(&(new->servaddr), 0, sl);
806 getsockname(sock, (struct sockaddr *) &(new->servaddr), &sl);
814 struct client * uh_client_lookup(int sock)
816 struct client *cur = NULL;
819 for( i = 0; i < uh_client_count; i++ )
821 cur = (struct client *) &uh_clients[i * sizeof(struct client)];
823 if( cur->socket == sock )
830 void uh_client_remove(int sock)
832 struct client *del = uh_client_lookup(sock);
836 memmove(del, del + 1,
837 sizeof(uh_clients) - (int)((char *)del - uh_clients) - sizeof(struct client));