Root/package/uhttpd/src/uhttpd-utils.c

1/*
2 * uhttpd - Tiny single-threaded httpd - Utility functions
3 *
4 * Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
5 *
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
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
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.
17 */
18
19#define _XOPEN_SOURCE 500 /* crypt() */
20#define _BSD_SOURCE /* strcasecmp(), strncasecmp() */
21
22#include "uhttpd.h"
23#include "uhttpd-utils.h"
24
25#ifdef HAVE_TLS
26#include "uhttpd-tls.h"
27#endif
28
29
30static char *uh_index_files[] = {
31    "index.html",
32    "index.htm",
33    "default.html",
34    "default.htm"
35};
36
37
38const char * sa_straddr(void *sa)
39{
40    static char str[INET6_ADDRSTRLEN];
41    struct sockaddr_in *v4 = (struct sockaddr_in *)sa;
42    struct sockaddr_in6 *v6 = (struct sockaddr_in6 *)sa;
43
44    if( v4->sin_family == AF_INET )
45        return inet_ntop(AF_INET, &(v4->sin_addr), str, sizeof(str));
46    else
47        return inet_ntop(AF_INET6, &(v6->sin6_addr), str, sizeof(str));
48}
49
50const char * sa_strport(void *sa)
51{
52    static char str[6];
53    snprintf(str, sizeof(str), "%i", sa_port(sa));
54    return str;
55}
56
57int sa_port(void *sa)
58{
59    return ntohs(((struct sockaddr_in6 *)sa)->sin6_port);
60}
61
62int sa_rfc1918(void *sa)
63{
64    struct sockaddr_in *v4 = (struct sockaddr_in *)sa;
65    unsigned long a = htonl(v4->sin_addr.s_addr);
66
67    if( v4->sin_family == AF_INET )
68    {
69        return ((a >= 0x0A000000) && (a <= 0x0AFFFFFF)) ||
70               ((a >= 0xAC100000) && (a <= 0xAC1FFFFF)) ||
71               ((a >= 0xC0A80000) && (a <= 0xC0A8FFFF));
72    }
73
74    return 0;
75}
76
77/* Simple strstr() like function that takes len arguments for both haystack and needle. */
78char *strfind(char *haystack, int hslen, const char *needle, int ndlen)
79{
80    int match = 0;
81    int i, j;
82
83    for( i = 0; i < hslen; i++ )
84    {
85        if( haystack[i] == needle[0] )
86        {
87            match = ((ndlen == 1) || ((i + ndlen) <= hslen));
88
89            for( j = 1; (j < ndlen) && ((i + j) < hslen); j++ )
90            {
91                if( haystack[i+j] != needle[j] )
92                {
93                    match = 0;
94                    break;
95                }
96            }
97
98            if( match )
99                return &haystack[i];
100        }
101    }
102
103    return NULL;
104}
105
106/* interruptable select() */
107int select_intr(int n, fd_set *r, fd_set *w, fd_set *e, struct timeval *t)
108{
109    int rv;
110    sigset_t ssn, sso;
111
112    /* unblock SIGCHLD */
113    sigemptyset(&ssn);
114    sigaddset(&ssn, SIGCHLD);
115    sigaddset(&ssn, SIGPIPE);
116    sigprocmask(SIG_UNBLOCK, &ssn, &sso);
117
118    rv = select(n, r, w, e, t);
119
120    /* restore signal mask */
121    sigprocmask(SIG_SETMASK, &sso, NULL);
122
123    return rv;
124}
125
126
127int uh_tcp_send(struct client *cl, const char *buf, int len)
128{
129    fd_set writer;
130    struct timeval timeout;
131
132    FD_ZERO(&writer);
133    FD_SET(cl->socket, &writer);
134
135    timeout.tv_sec = cl->server->conf->network_timeout;
136    timeout.tv_usec = 0;
137
138    if( select(cl->socket + 1, NULL, &writer, NULL, &timeout) > 0 )
139    {
140#ifdef HAVE_TLS
141        if( cl->tls )
142            return cl->server->conf->tls_send(cl, (void *)buf, len);
143        else
144#endif
145            return send(cl->socket, buf, len, 0);
146    }
147
148    return -1;
149}
150
151int uh_tcp_peek(struct client *cl, char *buf, int len)
152{
153    int sz = uh_tcp_recv(cl, buf, len);
154
155    /* store received data in peek buffer */
156    if( sz > 0 )
157    {
158        cl->peeklen = sz;
159        memcpy(cl->peekbuf, buf, sz);
160    }
161
162    return sz;
163}
164
165int uh_tcp_recv(struct client *cl, char *buf, int len)
166{
167    int sz = 0;
168    int rsz = 0;
169
170    /* first serve data from peek buffer */
171    if( cl->peeklen > 0 )
172    {
173        sz = min(cl->peeklen, len);
174        len -= sz; cl->peeklen -= sz;
175
176        memcpy(buf, cl->peekbuf, sz);
177        memmove(cl->peekbuf, &cl->peekbuf[sz], cl->peeklen);
178    }
179
180    /* caller wants more */
181    if( len > 0 )
182    {
183#ifdef HAVE_TLS
184        if( cl->tls )
185            rsz = cl->server->conf->tls_recv(cl, (void *)&buf[sz], len);
186        else
187#endif
188            rsz = recv(cl->socket, (void *)&buf[sz], len, 0);
189
190        if( (sz == 0) || (rsz > 0) )
191            sz += rsz;
192    }
193
194    return sz;
195}
196
197
198int uh_http_sendhf(struct client *cl, int code, const char *summary, const char *fmt, ...)
199{
200    va_list ap;
201
202    char buffer[UH_LIMIT_MSGHEAD];
203    int len;
204
205    len = snprintf(buffer, sizeof(buffer),
206        "HTTP/1.1 %03i %s\r\n"
207        "Connection: close\r\n"
208        "Content-Type: text/plain\r\n"
209        "Transfer-Encoding: chunked\r\n\r\n",
210            code, summary
211    );
212
213    ensure_ret(uh_tcp_send(cl, buffer, len));
214
215    va_start(ap, fmt);
216    len = vsnprintf(buffer, sizeof(buffer), fmt, ap);
217    va_end(ap);
218
219    ensure_ret(uh_http_sendc(cl, buffer, len));
220    ensure_ret(uh_http_sendc(cl, NULL, 0));
221
222    return 0;
223}
224
225
226int uh_http_sendc(struct client *cl, const char *data, int len)
227{
228    char chunk[8];
229    int clen;
230
231    if( len == -1 )
232        len = strlen(data);
233
234    if( len > 0 )
235    {
236         clen = snprintf(chunk, sizeof(chunk), "%X\r\n", len);
237        ensure_ret(uh_tcp_send(cl, chunk, clen));
238        ensure_ret(uh_tcp_send(cl, data, len));
239        ensure_ret(uh_tcp_send(cl, "\r\n", 2));
240    }
241    else
242    {
243        ensure_ret(uh_tcp_send(cl, "0\r\n\r\n", 5));
244    }
245
246    return 0;
247}
248
249int uh_http_sendf(
250    struct client *cl, struct http_request *req, const char *fmt, ...
251) {
252    va_list ap;
253    char buffer[UH_LIMIT_MSGHEAD];
254    int len;
255
256    va_start(ap, fmt);
257    len = vsnprintf(buffer, sizeof(buffer), fmt, ap);
258    va_end(ap);
259
260    if( (req != NULL) && (req->version > 1.0) )
261        ensure_ret(uh_http_sendc(cl, buffer, len));
262    else if( len > 0 )
263        ensure_ret(uh_tcp_send(cl, buffer, len));
264
265    return 0;
266}
267
268int uh_http_send(
269    struct client *cl, struct http_request *req, const char *buf, int len
270) {
271    if( len < 0 )
272        len = strlen(buf);
273
274    if( (req != NULL) && (req->version > 1.0) )
275        ensure_ret(uh_http_sendc(cl, buf, len));
276    else if( len > 0 )
277        ensure_ret(uh_tcp_send(cl, buf, len));
278
279    return 0;
280}
281
282
283int uh_urldecode(char *buf, int blen, const char *src, int slen)
284{
285    int i;
286    int len = 0;
287
288#define hex(x) \
289    (((x) <= '9') ? ((x) - '0') : \
290        (((x) <= 'F') ? ((x) - 'A' + 10) : \
291            ((x) - 'a' + 10)))
292
293    for( i = 0; (i <= slen) && (i <= blen); i++ )
294    {
295        if( src[i] == '%' )
296        {
297            if( ((i+2) <= slen) && isxdigit(src[i+1]) && isxdigit(src[i+2]) )
298            {
299                buf[len++] = (char)(16 * hex(src[i+1]) + hex(src[i+2]));
300                i += 2;
301            }
302            else
303            {
304                buf[len++] = '%';
305            }
306        }
307        else
308        {
309            buf[len++] = src[i];
310        }
311    }
312
313    return len;
314}
315
316int uh_urlencode(char *buf, int blen, const char *src, int slen)
317{
318    int i;
319    int len = 0;
320    const char hex[] = "0123456789abcdef";
321
322    for( i = 0; (i <= slen) && (i <= blen); i++ )
323    {
324        if( isalnum(src[i]) || (src[i] == '-') || (src[i] == '_') ||
325            (src[i] == '.') || (src[i] == '~') )
326        {
327            buf[len++] = src[i];
328        }
329        else if( (len+3) <= blen )
330        {
331            buf[len++] = '%';
332            buf[len++] = hex[(src[i] >> 4) & 15];
333            buf[len++] = hex[(src[i] & 15) & 15];
334        }
335        else
336        {
337            break;
338        }
339    }
340
341    return len;
342}
343
344int uh_b64decode(char *buf, int blen, const unsigned char *src, int slen)
345{
346    int i = 0;
347    int len = 0;
348
349    unsigned int cin = 0;
350    unsigned int cout = 0;
351
352
353    for( i = 0; (i <= slen) && (src[i] != 0); i++ )
354    {
355        cin = src[i];
356
357        if( (cin >= '0') && (cin <= '9') )
358            cin = cin - '0' + 52;
359        else if( (cin >= 'A') && (cin <= 'Z') )
360            cin = cin - 'A';
361        else if( (cin >= 'a') && (cin <= 'z') )
362            cin = cin - 'a' + 26;
363        else if( cin == '+' )
364            cin = 62;
365        else if( cin == '/' )
366            cin = 63;
367        else if( cin == '=' )
368            cin = 0;
369        else
370            continue;
371
372        cout = (cout << 6) | cin;
373
374        if( (i % 4) == 3 )
375        {
376            if( (len + 3) < blen )
377            {
378                buf[len++] = (char)(cout >> 16);
379                buf[len++] = (char)(cout >> 8);
380                buf[len++] = (char)(cout);
381            }
382            else
383            {
384                break;
385            }
386        }
387    }
388
389    buf[len++] = 0;
390    return len;
391}
392
393static char * canonpath(const char *path, char *path_resolved)
394{
395    char path_copy[PATH_MAX];
396    char *path_cpy = path_copy;
397    char *path_res = path_resolved;
398
399    struct stat s;
400
401
402    /* relative -> absolute */
403    if( *path != '/' )
404    {
405        getcwd(path_copy, PATH_MAX);
406        strncat(path_copy, "/", PATH_MAX - strlen(path_copy));
407        strncat(path_copy, path, PATH_MAX - strlen(path_copy));
408    }
409    else
410    {
411        strncpy(path_copy, path, PATH_MAX);
412    }
413
414    /* normalize */
415    while( (*path_cpy != '\0') && (path_cpy < (path_copy + PATH_MAX - 2)) )
416    {
417        if( *path_cpy == '/' )
418        {
419            /* skip repeating / */
420            if( path_cpy[1] == '/' )
421            {
422                path_cpy++;
423                continue;
424            }
425
426            /* /./ or /../ */
427            else if( path_cpy[1] == '.' )
428            {
429                /* skip /./ */
430                if( (path_cpy[2] == '/') || (path_cpy[2] == '\0') )
431                {
432                    path_cpy += 2;
433                    continue;
434                }
435
436                /* collapse /x/../ */
437                else if( (path_cpy[2] == '.') &&
438                         ((path_cpy[3] == '/') || (path_cpy[3] == '\0'))
439                ) {
440                    while( (path_res > path_resolved) && (*--path_res != '/') )
441                        ;
442
443                    path_cpy += 3;
444                    continue;
445                }
446            }
447        }
448
449        *path_res++ = *path_cpy++;
450    }
451
452    /* remove trailing slash if not root / */
453    if( (path_res > (path_resolved+1)) && (path_res[-1] == '/') )
454        path_res--;
455    else if( path_res == path_resolved )
456        *path_res++ = '/';
457
458    *path_res = '\0';
459
460    /* test access */
461    if( !stat(path_resolved, &s) && (s.st_mode & S_IROTH) )
462        return path_resolved;
463
464    return NULL;
465}
466
467struct path_info * uh_path_lookup(struct client *cl, const char *url)
468{
469    static char path_phys[PATH_MAX];
470    static char path_info[PATH_MAX];
471    static struct path_info p;
472
473    char buffer[UH_LIMIT_MSGHEAD];
474    char *docroot = cl->server->conf->docroot;
475    char *pathptr = NULL;
476
477    int no_sym = cl->server->conf->no_symlinks;
478    int i = 0;
479    struct stat s;
480
481    /* back out early if url is undefined */
482    if ( url == NULL )
483        return NULL;
484
485    memset(path_phys, 0, sizeof(path_phys));
486    memset(path_info, 0, sizeof(path_info));
487    memset(buffer, 0, sizeof(buffer));
488    memset(&p, 0, sizeof(p));
489
490    /* copy docroot */
491    memcpy(buffer, docroot,
492        min(strlen(docroot), sizeof(buffer) - 1));
493
494    /* separate query string from url */
495    if( (pathptr = strchr(url, '?')) != NULL )
496    {
497        p.query = pathptr[1] ? pathptr + 1 : NULL;
498
499        /* urldecode component w/o query */
500        if( pathptr > url )
501            uh_urldecode(
502                &buffer[strlen(docroot)],
503                sizeof(buffer) - strlen(docroot) - 1,
504                url, (int)(pathptr - url) - 1
505            );
506    }
507
508    /* no query string, decode all of url */
509    else
510    {
511        uh_urldecode(
512            &buffer[strlen(docroot)],
513            sizeof(buffer) - strlen(docroot) - 1,
514            url, strlen(url)
515        );
516    }
517
518    /* create canon path */
519    for( i = strlen(buffer); i >= 0; i-- )
520    {
521        if( (buffer[i] == 0) || (buffer[i] == '/') )
522        {
523            memset(path_info, 0, sizeof(path_info));
524            memcpy(path_info, buffer, min(i + 1, sizeof(path_info) - 1));
525
526            if( no_sym ? realpath(path_info, path_phys)
527                       : canonpath(path_info, path_phys)
528            ) {
529                memset(path_info, 0, sizeof(path_info));
530                memcpy(path_info, &buffer[i],
531                    min(strlen(buffer) - i, sizeof(path_info) - 1));
532
533                break;
534            }
535        }
536    }
537
538    /* check whether found path is within docroot */
539    if( strncmp(path_phys, docroot, strlen(docroot)) ||
540        ((path_phys[strlen(docroot)] != 0) &&
541         (path_phys[strlen(docroot)] != '/'))
542    ) {
543        return NULL;
544    }
545
546    /* test current path */
547    if( ! stat(path_phys, &p.stat) )
548    {
549        /* is a regular file */
550        if( p.stat.st_mode & S_IFREG )
551        {
552            p.root = docroot;
553            p.phys = path_phys;
554            p.name = &path_phys[strlen(docroot)];
555            p.info = path_info[0] ? path_info : NULL;
556        }
557
558        /* is a directory */
559        else if( (p.stat.st_mode & S_IFDIR) && !strlen(path_info) )
560        {
561            /* ensure trailing slash */
562            if( path_phys[strlen(path_phys)-1] != '/' )
563                path_phys[strlen(path_phys)] = '/';
564
565            /* try to locate index file */
566            memset(buffer, 0, sizeof(buffer));
567            memcpy(buffer, path_phys, sizeof(buffer));
568            pathptr = &buffer[strlen(buffer)];
569
570            if( cl->server->conf->index_file )
571            {
572                strncat(buffer, cl->server->conf->index_file, sizeof(buffer));
573
574                if( !stat(buffer, &s) && (s.st_mode & S_IFREG) )
575                {
576                    memcpy(path_phys, buffer, sizeof(path_phys));
577                    memcpy(&p.stat, &s, sizeof(p.stat));
578                }
579            }
580            else
581            {
582                for( i = 0; i < array_size(uh_index_files); i++ )
583                {
584                    strncat(buffer, uh_index_files[i], sizeof(buffer));
585
586                    if( !stat(buffer, &s) && (s.st_mode & S_IFREG) )
587                    {
588                        memcpy(path_phys, buffer, sizeof(path_phys));
589                        memcpy(&p.stat, &s, sizeof(p.stat));
590                        break;
591                    }
592
593                    *pathptr = 0;
594                }
595            }
596
597            p.root = docroot;
598            p.phys = path_phys;
599            p.name = &path_phys[strlen(docroot)];
600        }
601    }
602
603    return p.phys ? &p : NULL;
604}
605
606
607static struct auth_realm *uh_realms = NULL;
608
609struct auth_realm * uh_auth_add(char *path, char *user, char *pass)
610{
611    struct auth_realm *new = NULL;
612    struct passwd *pwd;
613    struct spwd *spwd;
614
615    if((new = (struct auth_realm *)malloc(sizeof(struct auth_realm))) != NULL)
616    {
617        memset(new, 0, sizeof(struct auth_realm));
618
619        memcpy(new->path, path,
620            min(strlen(path), sizeof(new->path) - 1));
621
622        memcpy(new->user, user,
623            min(strlen(user), sizeof(new->user) - 1));
624
625        /* given password refers to a passwd entry */
626        if( (strlen(pass) > 3) && !strncmp(pass, "$p$", 3) )
627        {
628            /* try to resolve shadow entry */
629            if( ((spwd = getspnam(&pass[3])) != NULL) && spwd->sp_pwdp )
630            {
631                memcpy(new->pass, spwd->sp_pwdp,
632                    min(strlen(spwd->sp_pwdp), sizeof(new->pass) - 1));
633            }
634
635            /* try to resolve passwd entry */
636            else if( ((pwd = getpwnam(&pass[3])) != NULL) && pwd->pw_passwd &&
637                (pwd->pw_passwd[0] != '!') && (pwd->pw_passwd[0] != 0)
638            ) {
639                memcpy(new->pass, pwd->pw_passwd,
640                    min(strlen(pwd->pw_passwd), sizeof(new->pass) - 1));
641            }
642        }
643
644        /* ordinary pwd */
645        else
646        {
647            memcpy(new->pass, pass,
648                min(strlen(pass), sizeof(new->pass) - 1));
649        }
650
651        if( new->pass[0] )
652        {
653            new->next = uh_realms;
654            uh_realms = new;
655
656            return new;
657        }
658
659        free(new);
660    }
661
662    return NULL;
663}
664
665int uh_auth_check(
666    struct client *cl, struct http_request *req, struct path_info *pi
667) {
668    int i, plen, rlen, protected;
669    char buffer[UH_LIMIT_MSGHEAD];
670    char *user = NULL;
671    char *pass = NULL;
672
673    struct auth_realm *realm = NULL;
674
675    plen = strlen(pi->name);
676    protected = 0;
677
678    /* check whether at least one realm covers the requested url */
679    for( realm = uh_realms; realm; realm = realm->next )
680    {
681        rlen = strlen(realm->path);
682
683        if( (plen >= rlen) && !strncasecmp(pi->name, realm->path, rlen) )
684        {
685            req->realm = realm;
686            protected = 1;
687            break;
688        }
689    }
690
691    /* requested resource is covered by a realm */
692    if( protected )
693    {
694        /* try to get client auth info */
695        foreach_header(i, req->headers)
696        {
697            if( !strcasecmp(req->headers[i], "Authorization") &&
698                (strlen(req->headers[i+1]) > 6) &&
699                !strncasecmp(req->headers[i+1], "Basic ", 6)
700            ) {
701                memset(buffer, 0, sizeof(buffer));
702                uh_b64decode(buffer, sizeof(buffer) - 1,
703                    (unsigned char *) &req->headers[i+1][6],
704                    strlen(req->headers[i+1]) - 6);
705
706                if( (pass = strchr(buffer, ':')) != NULL )
707                {
708                    user = buffer;
709                    *pass++ = 0;
710                }
711
712                break;
713            }
714        }
715
716        /* have client auth */
717        if( user && pass )
718        {
719            /* find matching realm */
720            for( realm = uh_realms; realm; realm = realm->next )
721            {
722                rlen = strlen(realm->path);
723
724                if( (plen >= rlen) &&
725                    !strncasecmp(pi->name, realm->path, rlen) &&
726                    !strcmp(user, realm->user)
727                ) {
728                    req->realm = realm;
729                    break;
730                }
731            }
732
733            /* found a realm matching the username */
734            if( realm )
735            {
736                /* is a crypt passwd */
737                if( realm->pass[0] == '$' )
738                    pass = crypt(pass, realm->pass);
739
740                /* check user pass */
741                if( !strcmp(pass, realm->pass) )
742                    return 1;
743            }
744        }
745
746        /* 401 */
747        uh_http_sendf(cl, NULL,
748            "HTTP/%.1f 401 Authorization Required\r\n"
749            "WWW-Authenticate: Basic realm=\"%s\"\r\n"
750            "Content-Type: text/plain\r\n"
751            "Content-Length: 23\r\n\r\n"
752            "Authorization Required\n",
753                req->version, cl->server->conf->realm
754        );
755
756        return 0;
757    }
758
759    return 1;
760}
761
762
763static struct listener *uh_listeners = NULL;
764static struct client *uh_clients = NULL;
765
766struct listener * uh_listener_add(int sock, struct config *conf)
767{
768    struct listener *new = NULL;
769    socklen_t sl;
770
771    if( (new = (struct listener *)malloc(sizeof(struct listener))) != NULL )
772    {
773        memset(new, 0, sizeof(struct listener));
774
775        new->socket = sock;
776        new->conf = conf;
777
778        /* get local endpoint addr */
779        sl = sizeof(struct sockaddr_in6);
780        memset(&(new->addr), 0, sl);
781        getsockname(sock, (struct sockaddr *) &(new->addr), &sl);
782
783        new->next = uh_listeners;
784        uh_listeners = new;
785
786        return new;
787    }
788
789    return NULL;
790}
791
792struct listener * uh_listener_lookup(int sock)
793{
794    struct listener *cur = NULL;
795
796    for( cur = uh_listeners; cur; cur = cur->next )
797        if( cur->socket == sock )
798            return cur;
799
800    return NULL;
801}
802
803
804struct client * uh_client_add(int sock, struct listener *serv)
805{
806    struct client *new = NULL;
807    socklen_t sl;
808
809    if( (new = (struct client *)malloc(sizeof(struct client))) != NULL )
810    {
811        memset(new, 0, sizeof(struct client));
812
813        new->socket = sock;
814        new->server = serv;
815
816        /* get remote endpoint addr */
817        sl = sizeof(struct sockaddr_in6);
818        memset(&(new->peeraddr), 0, sl);
819        getpeername(sock, (struct sockaddr *) &(new->peeraddr), &sl);
820
821        /* get local endpoint addr */
822        sl = sizeof(struct sockaddr_in6);
823        memset(&(new->servaddr), 0, sl);
824        getsockname(sock, (struct sockaddr *) &(new->servaddr), &sl);
825
826        new->next = uh_clients;
827        uh_clients = new;
828    }
829
830    return new;
831}
832
833struct client * uh_client_lookup(int sock)
834{
835    struct client *cur = NULL;
836
837    for( cur = uh_clients; cur; cur = cur->next )
838        if( cur->socket == sock )
839            return cur;
840
841    return NULL;
842}
843
844void uh_client_remove(int sock)
845{
846    struct client *cur = NULL;
847    struct client *prv = NULL;
848
849    for( cur = uh_clients; cur; prv = cur, cur = cur->next )
850    {
851        if( cur->socket == sock )
852        {
853            if( prv )
854                prv->next = cur->next;
855            else
856                uh_clients = cur->next;
857
858            free(cur);
859            break;
860        }
861    }
862}
863
864
865#ifdef HAVE_CGI
866static struct interpreter *uh_interpreters = NULL;
867
868struct interpreter * uh_interpreter_add(const char *extn, const char *path)
869{
870    struct interpreter *new = NULL;
871
872    if( (new = (struct interpreter *)
873            malloc(sizeof(struct interpreter))) != NULL )
874    {
875        memset(new, 0, sizeof(struct interpreter));
876
877        memcpy(new->extn, extn, min(strlen(extn), sizeof(new->extn)-1));
878        memcpy(new->path, path, min(strlen(path), sizeof(new->path)-1));
879
880        new->next = uh_interpreters;
881        uh_interpreters = new;
882
883        return new;
884    }
885
886    return NULL;
887}
888
889struct interpreter * uh_interpreter_lookup(const char *path)
890{
891    struct interpreter *cur = NULL;
892    const char *e;
893
894    for( cur = uh_interpreters; cur; cur = cur->next )
895    {
896        e = &path[max(strlen(path) - strlen(cur->extn), 0)];
897
898        if( !strcmp(e, cur->extn) )
899            return cur;
900    }
901
902    return NULL;
903}
904#endif
905

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