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
  30 static char *uh_index_files[] = {
  31         "index.html",
  32         "index.htm",
  33         "default.html",
  34         "default.htm"
  35 };
  36
  37
  38 const 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
  50 const 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
  57 int sa_port(void *sa)
  58 {
  59         return ntohs(((struct sockaddr_in6 *)sa)->sin6_port);
  60 }
  61
  62 int 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. */
  78 char *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() */
 107 int 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         sigprocmask(SIG_UNBLOCK, &ssn, &sso);
 116
 117         rv = select(n, r, w, e, t);
 118
 119         /* restore signal mask */
 120         sigprocmask(SIG_SETMASK, &sso, NULL);
 121
 122         return rv;
 123 }
 124
 125
 126 int uh_tcp_send(struct client *cl, const char *buf, int len)
 127 {
 128         fd_set writer;
 129         struct timeval timeout;
 130
 131         FD_ZERO(&writer);
 132         FD_SET(cl->socket, &writer);
 133
 134         timeout.tv_sec = cl->server->conf->network_timeout;
 135         timeout.tv_usec = 0;
 136
 137         if( select(cl->socket + 1, NULL, &writer, NULL, &timeout) > 0 )
 138         {
 139 #ifdef HAVE_TLS
 140                 if( cl->tls )
 141                         return cl->server->conf->tls_send(cl, (void *)buf, len);
 142                 else
 143 #endif
 144                         return send(cl->socket, buf, len, 0);
 145         }
 146
 147         return -1;
 148 }
 149
 150 int uh_tcp_peek(struct client *cl, char *buf, int len)
 151 {
 152         int sz = uh_tcp_recv(cl, buf, len);
 153
 154         /* store received data in peek buffer */
 155         if( sz > 0 )
 156         {
 157                 cl->peeklen = sz;
 158                 memcpy(cl->peekbuf, buf, sz);
 159         }
 160
 161         return sz;
 162 }
 163
 164 int uh_tcp_recv(struct client *cl, char *buf, int len)
 165 {
 166         int sz = 0;
 167         int rsz = 0;
 168
 169         /* first serve data from peek buffer */
 170         if( cl->peeklen > 0 )
 171         {
 172                 sz = min(cl->peeklen, len);
 173                 len -= sz; cl->peeklen -= sz;
 174
 175                 memcpy(buf, cl->peekbuf, sz);
 176                 memmove(cl->peekbuf, &cl->peekbuf[sz], cl->peeklen);
 177         }
 178
 179         /* caller wants more */
 180         if( len > 0 )
 181         {
 182 #ifdef HAVE_TLS
 183                 if( cl->tls )
 184                         rsz = cl->server->conf->tls_recv(cl, (void *)&buf[sz], len);
 185                 else
 186 #endif
 187                         rsz = recv(cl->socket, (void *)&buf[sz], len, 0);
 188
 189                 if( (sz == 0) || (rsz > 0) )
 190                         sz += rsz;
 191         }
 192
 193         return sz;
 194 }
 195
 196 #define ensure(x) \
 197         do { if( x < 0 ) return -1; } while(0)
 198
 199 int uh_http_sendhf(struct client *cl, int code, const char *summary, const char *fmt, ...)
 200 {
 201         va_list ap;
 202
 203         char buffer[UH_LIMIT_MSGHEAD];
 204         int len;
 205
 206         len = snprintf(buffer, sizeof(buffer),
 207                 "HTTP/1.1 %03i %s\r\n"
 208                 "Connection: close\r\n"
 209                 "Content-Type: text/plain\r\n"
 210                 "Transfer-Encoding: chunked\r\n\r\n",
 211                         code, summary
 212         );
 213
 214         ensure(uh_tcp_send(cl, buffer, len));
 215
 216         va_start(ap, fmt);
 217         len = vsnprintf(buffer, sizeof(buffer), fmt, ap);
 218         va_end(ap);
 219
 220         ensure(uh_http_sendc(cl, buffer, len));
 221         ensure(uh_http_sendc(cl, NULL, 0));
 222
 223         return 0;
 224 }
 225
 226
 227 int uh_http_sendc(struct client *cl, const char *data, int len)
 228 {
 229         char chunk[8];
 230         int clen;
 231
 232         if( len == -1 )
 233                 len = strlen(data);
 234
 235         if( len > 0 )
 236         {
 237                 clen = snprintf(chunk, sizeof(chunk), "%X\r\n", len);
 238                 ensure(uh_tcp_send(cl, chunk, clen));
 239                 ensure(uh_tcp_send(cl, data, len));
 240                 ensure(uh_tcp_send(cl, "\r\n", 2));
 241         }
 242         else
 243         {
 244                 ensure(uh_tcp_send(cl, "0\r\n\r\n", 5));
 245         }
 246
 247         return 0;
 248 }
 249
 250 int uh_http_sendf(
 251         struct client *cl, struct http_request *req, const char *fmt, ...
 252 ) {
 253         va_list ap;
 254         char buffer[UH_LIMIT_MSGHEAD];
 255         int len;
 256
 257         va_start(ap, fmt);
 258         len = vsnprintf(buffer, sizeof(buffer), fmt, ap);
 259         va_end(ap);
 260
 261         if( (req != NULL) && (req->version > 1.0) )
 262                 ensure(uh_http_sendc(cl, buffer, len));
 263         else if( len > 0 )
 264                 ensure(uh_tcp_send(cl, buffer, len));
 265
 266         return 0;
 267 }
 268
 269 int uh_http_send(
 270         struct client *cl, struct http_request *req, const char *buf, int len
 271 ) {
 272         if( len < 0 )
 273                 len = strlen(buf);
 274
 275         if( (req != NULL) && (req->version > 1.0) )
 276                 ensure(uh_http_sendc(cl, buf, len));
 277         else if( len > 0 )
 278                 ensure(uh_tcp_send(cl, buf, len));
 279
 280         return 0;
 281 }
 282
 283
 284 int uh_urldecode(char *buf, int blen, const char *src, int slen)
 285 {
 286         int i;
 287         int len = 0;
 288
 289 #define hex(x) \
 290         (((x) <= '9') ? ((x) - '0') : \
 291                 (((x) <= 'F') ? ((x) - 'A' + 10) : \
 292                         ((x) - 'a' + 10)))
 293
 294         for( i = 0; (i <= slen) && (i <= blen); i++ )
 295         {
 296                 if( src[i] == '%' )
 297                 {
 298                         if( ((i+2) <= slen) && isxdigit(src[i+1]) && isxdigit(src[i+2]) )
 299                         {
 300                                 buf[len++] = (char)(16 * hex(src[i+1]) + hex(src[i+2]));
 301                                 i += 2;
 302                         }
 303                         else
 304                         {
 305                                 buf[len++] = '%';
 306                         }
 307                 }
 308                 else
 309                 {
 310                         buf[len++] = src[i];
 311                 }
 312         }
 313
 314         return len;
 315 }
 316
 317 int uh_urlencode(char *buf, int blen, const char *src, int slen)
 318 {
 319         int i;
 320         int len = 0;
 321         const char hex[] = "0123456789abcdef";
 322
 323         for( i = 0; (i <= slen) && (i <= blen); i++ )
 324         {
 325                 if( isalnum(src[i]) || (src[i] == '-') || (src[i] == '_') ||
 326                     (src[i] == '.') || (src[i] == '~') )
 327                 {
 328                         buf[len++] = src[i];
 329                 }
 330                 else if( (len+3) <= blen )
 331                 {
 332                         buf[len++] = '%';
 333                         buf[len++] = hex[(src[i] >> 4) & 15];
 334                         buf[len++] = hex[(src[i] & 15) & 15];
 335                 }
 336                 else
 337                 {
 338                         break;
 339                 }
 340         }
 341
 342         return len;
 343 }
 344
 345 int uh_b64decode(char *buf, int blen, const unsigned char *src, int slen)
 346 {
 347         int i = 0;
 348         int len = 0;
 349
 350         unsigned int cin  = 0;
 351         unsigned int cout = 0;
 352
 353
 354         for( i = 0; (i <= slen) && (src[i] != 0); i++ )
 355         {
 356                 cin = src[i];
 357
 358                 if( (cin >= '0') && (cin <= '9') )
 359                         cin = cin - '0' + 52;
 360                 else if( (cin >= 'A') && (cin <= 'Z') )
 361                         cin = cin - 'A';
 362                 else if( (cin >= 'a') && (cin <= 'z') )
 363                         cin = cin - 'a' + 26;
 364                 else if( cin == '+' )
 365                         cin = 62;
 366                 else if( cin == '/' )
 367                         cin = 63;
 368                 else if( cin == '=' )
 369                         cin = 0;
 370                 else
 371                         continue;
 372
 373                 cout = (cout << 6) | cin;
 374
 375                 if( (i % 4) == 3 )
 376                 {
 377                         if( (len + 3) < blen )
 378                         {
 379                                 buf[len++] = (char)(cout >> 16);
 380                                 buf[len++] = (char)(cout >> 8);
 381                                 buf[len++] = (char)(cout);
 382                         }
 383                         else
 384                         {
 385                                 break;
 386                         }
 387                 }
 388         }
 389
 390         buf[len++] = 0;
 391         return len;
 392 }
 393
 394 static char * canonpath(const char *path, char *path_resolved)
 395 {
 396         char path_copy[PATH_MAX];
 397         char *path_cpy = path_copy;
 398         char *path_res = path_resolved;
 399
 400         struct stat s;
 401
 402
 403         /* relative -> absolute */
 404         if( *path != '/' )
 405         {
 406                 getcwd(path_copy, PATH_MAX);
 407                 strncat(path_copy, "/", PATH_MAX - strlen(path_copy));
 408                 strncat(path_copy, path, PATH_MAX - strlen(path_copy));
 409         }
 410         else
 411         {
 412                 strncpy(path_copy, path, PATH_MAX);
 413         }
 414
 415         /* normalize */
 416         while( (*path_cpy != '\0') && (path_cpy < (path_copy + PATH_MAX - 2)) )
 417         {
 418                 if( *path_cpy == '/' )
 419                 {
 420                         /* skip repeating / */
 421                         if( path_cpy[1] == '/' )
 422                         {
 423                                 path_cpy++;
 424                                 continue;
 425                         }
 426
 427                         /* /./ or /../ */
 428                         else if( path_cpy[1] == '.' )
 429                         {
 430                                 /* skip /./ */
 431                                 if( (path_cpy[2] == '/') || (path_cpy[2] == '\0') )
 432                                 {
 433                                         path_cpy += 2;
 434                                         continue;
 435                                 }
 436
 437                                 /* collapse /x/../ */
 438                                 else if( (path_cpy[2] == '.') &&
 439                                          ((path_cpy[3] == '/') || (path_cpy[3] == '\0'))
 440                                 ) {
 441                                         while( (path_res > path_resolved) && (*--path_res != '/') )
 442                                                 ;
 443
 444                                         path_cpy += 3;
 445                                         continue;
 446                                 }
 447                         }
 448                 }
 449
 450                 *path_res++ = *path_cpy++;
 451         }
 452
 453         /* remove trailing slash if not root / */
 454         if( (path_res > (path_resolved+1)) && (path_res[-1] == '/') )
 455                 path_res--;
 456         else if( path_res == path_resolved )
 457                 *path_res++ = '/';
 458
 459         *path_res = '\0';
 460
 461         /* test access */
 462         if( !stat(path_resolved, &s) && (s.st_mode & S_IROTH) )
 463                 return path_resolved;
 464
 465         return NULL;
 466 }
 467
 468 struct path_info * uh_path_lookup(struct client *cl, const char *url)
 469 {
 470         static char path_phys[PATH_MAX];
 471         static char path_info[PATH_MAX];
 472         static struct path_info p;
 473
 474         char buffer[UH_LIMIT_MSGHEAD];
 475         char *docroot = cl->server->conf->docroot;
 476         char *pathptr = NULL;
 477
 478         int no_sym = cl->server->conf->no_symlinks;
 479         int i = 0;
 480         struct stat s;
 481
 482         /* back out early if url is undefined */
 483         if ( url == NULL )
 484                 return NULL;
 485
 486         memset(path_phys, 0, sizeof(path_phys));
 487         memset(path_info, 0, sizeof(path_info));
 488         memset(buffer, 0, sizeof(buffer));
 489         memset(&p, 0, sizeof(p));
 490
 491         /* copy docroot */
 492         memcpy(buffer, docroot,
 493                 min(strlen(docroot), sizeof(buffer) - 1));
 494
 495         /* separate query string from url */
 496         if( (pathptr = strchr(url, '?')) != NULL )
 497         {
 498                 p.query = pathptr[1] ? pathptr + 1 : NULL;
 499
 500                 /* urldecode component w/o query */
 501                 if( pathptr > url )
 502                         uh_urldecode(
 503                                 &buffer[strlen(docroot)],
 504                                 sizeof(buffer) - strlen(docroot) - 1,
 505                                 url, (int)(pathptr - url) - 1
 506                         );
 507         }
 508
 509         /* no query string, decode all of url */
 510         else
 511         {
 512                 uh_urldecode(
 513                         &buffer[strlen(docroot)],
 514                         sizeof(buffer) - strlen(docroot) - 1,
 515                         url, strlen(url)
 516                 );
 517         }
 518
 519         /* create canon path */
 520         for( i = strlen(buffer); i >= 0; i-- )
 521         {
 522                 if( (buffer[i] == 0) || (buffer[i] == '/') )
 523                 {
 524                         memset(path_info, 0, sizeof(path_info));
 525                         memcpy(path_info, buffer, min(i + 1, sizeof(path_info) - 1));
 526
 527                         if( no_sym ? realpath(path_info, path_phys)
 528                                    : canonpath(path_info, path_phys)
 529                         ) {
 530                                 memset(path_info, 0, sizeof(path_info));
 531                                 memcpy(path_info, &buffer[i],
 532                                         min(strlen(buffer) - i, sizeof(path_info) - 1));
 533
 534                                 break;
 535                         }
 536                 }
 537         }
 538
 539         /* check whether found path is within docroot */
 540         if( strncmp(path_phys, docroot, strlen(docroot)) ||
 541             ((path_phys[strlen(docroot)] != 0) &&
 542                  (path_phys[strlen(docroot)] != '/'))
 543         ) {
 544                 return NULL;
 545         }
 546
 547         /* test current path */
 548         if( ! stat(path_phys, &p.stat) )
 549         {
 550                 /* is a regular file */
 551                 if( p.stat.st_mode & S_IFREG )
 552                 {
 553                         p.root = docroot;
 554                         p.phys = path_phys;
 555                         p.name = &path_phys[strlen(docroot)];
 556                         p.info = path_info[0] ? path_info : NULL;
 557                 }
 558
 559                 /* is a directory */
 560                 else if( (p.stat.st_mode & S_IFDIR) && !strlen(path_info) )
 561                 {
 562                         /* ensure trailing slash */
 563                         if( path_phys[strlen(path_phys)-1] != '/' )
 564                                 path_phys[strlen(path_phys)] = '/';
 565
 566                         /* try to locate index file */
 567                         memset(buffer, 0, sizeof(buffer));
 568                         memcpy(buffer, path_phys, sizeof(buffer));
 569                         pathptr = &buffer[strlen(buffer)];
 570
 571                         if( cl->server->conf->index_file )
 572                         {
 573                                 strncat(buffer, cl->server->conf->index_file, sizeof(buffer));
 574
 575                                 if( !stat(buffer, &s) && (s.st_mode & S_IFREG) )
 576                                 {
 577                                         memcpy(path_phys, buffer, sizeof(path_phys));
 578                                         memcpy(&p.stat, &s, sizeof(p.stat));
 579                                 }
 580                         }
 581                         else
 582                         {
 583                                 for( i = 0; i < array_size(uh_index_files); i++ )
 584                                 {
 585                                         strncat(buffer, uh_index_files[i], sizeof(buffer));
 586
 587                                         if( !stat(buffer, &s) && (s.st_mode & S_IFREG) )
 588                                         {
 589                                                 memcpy(path_phys, buffer, sizeof(path_phys));
 590                                                 memcpy(&p.stat, &s, sizeof(p.stat));
 591                                                 break;
 592                                         }
 593
 594                                         *pathptr = 0;
 595                                 }
 596                         }
 597
 598                         p.root = docroot;
 599                         p.phys = path_phys;
 600                         p.name = &path_phys[strlen(docroot)];
 601                 }
 602         }
 603
 604         return p.phys ? &p : NULL;
 605 }
 606
 607
 608 static struct auth_realm *uh_realms = NULL;
 609
 610 struct auth_realm * uh_auth_add(char *path, char *user, char *pass)
 611 {
 612         struct auth_realm *new = NULL;
 613         struct passwd *pwd;
 614         struct spwd *spwd;
 615
 616         if((new = (struct auth_realm *)malloc(sizeof(struct auth_realm))) != NULL)
 617         {
 618                 memset(new, 0, sizeof(struct auth_realm));
 619
 620                 memcpy(new->path, path,
 621                         min(strlen(path), sizeof(new->path) - 1));
 622
 623                 memcpy(new->user, user,
 624                         min(strlen(user), sizeof(new->user) - 1));
 625
 626                 /* given password refers to a passwd entry */
 627                 if( (strlen(pass) > 3) && !strncmp(pass, "$p$", 3) )
 628                 {
 629                         /* try to resolve shadow entry */
 630                         if( ((spwd = getspnam(&pass[3])) != NULL) && spwd->sp_pwdp )
 631                         {
 632                                 memcpy(new->pass, spwd->sp_pwdp,
 633                                         min(strlen(spwd->sp_pwdp), sizeof(new->pass) - 1));
 634                         }
 635
 636                         /* try to resolve passwd entry */
 637                         else if( ((pwd = getpwnam(&pass[3])) != NULL) && pwd->pw_passwd &&
 638                                 (pwd->pw_passwd[0] != '!') && (pwd->pw_passwd[0] != 0)
 639                         ) {
 640                                 memcpy(new->pass, pwd->pw_passwd,
 641                                         min(strlen(pwd->pw_passwd), sizeof(new->pass) - 1));
 642                         }
 643                 }
 644
 645                 /* ordinary pwd */
 646                 else
 647                 {
 648                         memcpy(new->pass, pass,
 649                                 min(strlen(pass), sizeof(new->pass) - 1));
 650                 }
 651
 652                 if( new->pass[0] )
 653                 {
 654                         new->next = uh_realms;
 655                         uh_realms = new;
 656
 657                         return new;
 658                 }
 659
 660                 free(new);
 661         }
 662
 663         return NULL;
 664 }
 665
 666 int uh_auth_check(
 667         struct client *cl, struct http_request *req, struct path_info *pi
 668 ) {
 669         int i, plen, rlen, protected;
 670         char buffer[UH_LIMIT_MSGHEAD];
 671         char *user = NULL;
 672         char *pass = NULL;
 673
 674         struct auth_realm *realm = NULL;
 675
 676         plen = strlen(pi->name);
 677         protected = 0;
 678
 679         /* check whether at least one realm covers the requested url */
 680         for( realm = uh_realms; realm; realm = realm->next )
 681         {
 682                 rlen = strlen(realm->path);
 683
 684                 if( (plen >= rlen) && !strncasecmp(pi->name, realm->path, rlen) )
 685                 {
 686                         req->realm = realm;
 687                         protected = 1;
 688                         break;
 689                 }
 690         }
 691
 692         /* requested resource is covered by a realm */
 693         if( protected )
 694         {
 695                 /* try to get client auth info */
 696                 foreach_header(i, req->headers)
 697                 {
 698                         if( !strcasecmp(req->headers[i], "Authorization") &&
 699                                 (strlen(req->headers[i+1]) > 6) &&
 700                                 !strncasecmp(req->headers[i+1], "Basic ", 6)
 701                         ) {
 702                                 memset(buffer, 0, sizeof(buffer));
 703                                 uh_b64decode(buffer, sizeof(buffer) - 1,
 704                                         (unsigned char *) &req->headers[i+1][6],
 705                                         strlen(req->headers[i+1]) - 6);
 706
 707                                 if( (pass = strchr(buffer, ':')) != NULL )
 708                                 {
 709                                         user = buffer;
 710                                         *pass++ = 0;
 711                                 }
 712
 713                                 break;
 714                         }
 715                 }
 716
 717                 /* have client auth */
 718                 if( user && pass )
 719                 {
 720                         /* find matching realm */
 721                         for( realm = uh_realms; realm; realm = realm->next )
 722                         {
 723                                 rlen = strlen(realm->path);
 724
 725                                 if( (plen >= rlen) &&
 726                                     !strncasecmp(pi->name, realm->path, rlen) &&
 727                                     !strcmp(user, realm->user)
 728                                 ) {
 729                                         req->realm = realm;
 730                                         break;
 731                                 }
 732
 733                                 realm = NULL;
 734                         }
 735
 736                         /* found a realm matching the username */
 737                         if( realm )
 738                         {
 739                                 /* is a crypt passwd */
 740                                 if( realm->pass[0] == '$' )
 741                                         pass = crypt(pass, realm->pass);
 742
 743                                 /* check user pass */
 744                                 if( !strcmp(pass, realm->pass) )
 745                                         return 1;
 746                         }
 747                 }
 748
 749                 /* 401 */
 750                 uh_http_sendf(cl, NULL,
 751                         "HTTP/%.1f 401 Authorization Required\r\n"
 752                         "WWW-Authenticate: Basic realm=\"%s\"\r\n"
 753                         "Content-Type: text/plain\r\n"
 754                         "Content-Length: 23\r\n\r\n"
 755                         "Authorization Required\n",
 756                                 req->version, cl->server->conf->realm
 757                 );
 758
 759                 return 0;
 760         }
 761
 762         return 1;
 763 }
 764
 765
 766 static struct listener *uh_listeners = NULL;
 767 static struct client *uh_clients = NULL;
 768
 769 struct listener * uh_listener_add(int sock, struct config *conf)
 770 {
 771         struct listener *new = NULL;
 772         socklen_t sl;
 773
 774         if( (new = (struct listener *)malloc(sizeof(struct listener))) != NULL )
 775         {
 776                 memset(new, 0, sizeof(struct listener));
 777
 778                 new->socket = sock;
 779                 new->conf   = conf;
 780
 781                 /* get local endpoint addr */
 782                 sl = sizeof(struct sockaddr_in6);
 783                 memset(&(new->addr), 0, sl);
 784                 getsockname(sock, (struct sockaddr *) &(new->addr), &sl);
 785
 786                 new->next = uh_listeners;
 787                 uh_listeners = new;
 788
 789                 return new;
 790         }
 791
 792         return NULL;
 793 }
 794
 795 struct listener * uh_listener_lookup(int sock)
 796 {
 797         struct listener *cur = NULL;
 798
 799         for( cur = uh_listeners; cur; cur = cur->next )
 800                 if( cur->socket == sock )
 801                         return cur;
 802
 803         return NULL;
 804 }
 805
 806
 807 struct client * uh_client_add(int sock, struct listener *serv)
 808 {
 809         struct client *new = NULL;
 810         socklen_t sl;
 811
 812         if( (new = (struct client *)malloc(sizeof(struct client))) != NULL )
 813         {
 814                 memset(new, 0, sizeof(struct client));
 815
 816                 new->socket = sock;
 817                 new->server = serv;
 818
 819                 /* get remote endpoint addr */
 820                 sl = sizeof(struct sockaddr_in6);
 821                 memset(&(new->peeraddr), 0, sl);
 822                 getpeername(sock, (struct sockaddr *) &(new->peeraddr), &sl);
 823
 824                 /* get local endpoint addr */
 825                 sl = sizeof(struct sockaddr_in6);
 826                 memset(&(new->servaddr), 0, sl);
 827                 getsockname(sock, (struct sockaddr *) &(new->servaddr), &sl);
 828
 829                 new->next = uh_clients;
 830                 uh_clients = new;
 831         }
 832
 833         return new;
 834 }
 835
 836 struct client * uh_client_lookup(int sock)
 837 {
 838         struct client *cur = NULL;
 839
 840         for( cur = uh_clients; cur; cur = cur->next )
 841                 if( cur->socket == sock )
 842                         return cur;
 843
 844         return NULL;
 845 }
 846
 847 void uh_client_remove(int sock)
 848 {
 849         struct client *cur = NULL;
 850         struct client *prv = NULL;
 851
 852         for( cur = uh_clients; cur; prv = cur, cur = cur->next )
 853         {
 854                 if( cur->socket == sock )
 855                 {
 856                         if( prv )
 857                                 prv->next = cur->next;
 858                         else
 859                                 uh_clients = cur->next;
 860
 861                         free(cur);
 862                         break;
 863                 }
 864         }
 865 }
 866
 867
 868 #ifdef HAVE_CGI
 869 static struct interpreter *uh_interpreters = NULL;
 870
 871 struct interpreter * uh_interpreter_add(const char *extn, const char *path)
 872 {
 873         struct interpreter *new = NULL;
 874
 875         if( (new = (struct interpreter *)
 876                         malloc(sizeof(struct interpreter))) != NULL )
 877         {
 878                 memset(new, 0, sizeof(struct interpreter));
 879
 880                 memcpy(new->extn, extn, min(strlen(extn), sizeof(new->extn)-1));
 881                 memcpy(new->path, path, min(strlen(path), sizeof(new->path)-1));
 882
 883                 new->next = uh_interpreters;
 884                 uh_interpreters = new;
 885
 886                 return new;
 887         }
 888
 889         return NULL;
 890 }
 891
 892 struct interpreter * uh_interpreter_lookup(const char *path)
 893 {
 894         struct interpreter *cur = NULL;
 895         const char *e;
 896
 897         for( cur = uh_interpreters; cur; cur = cur->next )
 898         {
 899                 e = &path[max(strlen(path) - strlen(cur->extn), 0)];
 900
 901                 if( !strcmp(e, cur->extn) )
 902                         return cur;
 903         }
 904
 905         return NULL;
 906 }
 907 #endif