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         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
 127 int 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
 151 int 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
 165 int 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
 198 int 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
 226 int 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
 249 int 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
 268 int 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
 283 int 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
 316 int 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
 344 int 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
 393 static 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
 467 struct 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 slash = 0;
 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), slash = (buffer[max(0, i-1)] == '/'); 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 requested url resolves to a directory and a trailing slash
 572                            is missing in the request url, redirect the client to the same
 573                            url with trailing slash appended */
 574                         if( !slash )
 575                         {
 576                                 uh_http_sendf(cl, NULL,
 577                                         "HTTP/1.1 302 Found\r\n"
 578                                         "Location: %s%s%s\r\n"
 579                                         "Connection: close\r\n\r\n",
 580                                                 &path_phys[strlen(docroot)],
 581                                                 p.query ? "?" : "",
 582                                                 p.query ? p.query : ""
 583                                 );
 584
 585                                 p.redirected = 1;
 586                         }
 587                         else if( cl->server->conf->index_file )
 588                         {
 589                                 strncat(buffer, cl->server->conf->index_file, sizeof(buffer));
 590
 591                                 if( !stat(buffer, &s) && (s.st_mode & S_IFREG) )
 592                                 {
 593                                         memcpy(path_phys, buffer, sizeof(path_phys));
 594                                         memcpy(&p.stat, &s, sizeof(p.stat));
 595                                 }
 596                         }
 597                         else
 598                         {
 599                                 for( i = 0; i < array_size(uh_index_files); i++ )
 600                                 {
 601                                         strncat(buffer, uh_index_files[i], sizeof(buffer));
 602
 603                                         if( !stat(buffer, &s) && (s.st_mode & S_IFREG) )
 604                                         {
 605                                                 memcpy(path_phys, buffer, sizeof(path_phys));
 606                                                 memcpy(&p.stat, &s, sizeof(p.stat));
 607                                                 break;
 608                                         }
 609
 610                                         *pathptr = 0;
 611                                 }
 612                         }
 613
 614                         p.root = docroot;
 615                         p.phys = path_phys;
 616                         p.name = &path_phys[strlen(docroot)];
 617                 }
 618         }
 619
 620         return p.phys ? &p : NULL;
 621 }
 622
 623
 624 static struct auth_realm *uh_realms = NULL;
 625
 626 struct auth_realm * uh_auth_add(char *path, char *user, char *pass)
 627 {
 628         struct auth_realm *new = NULL;
 629         struct passwd *pwd;
 630
 631 #ifdef HAVE_SHADOW
 632         struct spwd *spwd;
 633 #endif
 634
 635         if((new = (struct auth_realm *)malloc(sizeof(struct auth_realm))) != NULL)
 636         {
 637                 memset(new, 0, sizeof(struct auth_realm));
 638
 639                 memcpy(new->path, path,
 640                         min(strlen(path), sizeof(new->path) - 1));
 641
 642                 memcpy(new->user, user,
 643                         min(strlen(user), sizeof(new->user) - 1));
 644
 645                 /* given password refers to a passwd entry */
 646                 if( (strlen(pass) > 3) && !strncmp(pass, "$p$", 3) )
 647                 {
 648 #ifdef HAVE_SHADOW
 649                         /* try to resolve shadow entry */
 650                         if( ((spwd = getspnam(&pass[3])) != NULL) && spwd->sp_pwdp )
 651                         {
 652                                 memcpy(new->pass, spwd->sp_pwdp,
 653                                         min(strlen(spwd->sp_pwdp), sizeof(new->pass) - 1));
 654                         }
 655
 656                         else
 657 #endif
 658
 659                         /* try to resolve passwd entry */
 660                         if( ((pwd = getpwnam(&pass[3])) != NULL) && pwd->pw_passwd &&
 661                                 (pwd->pw_passwd[0] != '!') && (pwd->pw_passwd[0] != 0)
 662                         ) {
 663                                 memcpy(new->pass, pwd->pw_passwd,
 664                                         min(strlen(pwd->pw_passwd), sizeof(new->pass) - 1));
 665                         }
 666                 }
 667
 668                 /* ordinary pwd */
 669                 else
 670                 {
 671                         memcpy(new->pass, pass,
 672                                 min(strlen(pass), sizeof(new->pass) - 1));
 673                 }
 674
 675                 if( new->pass[0] )
 676                 {
 677                         new->next = uh_realms;
 678                         uh_realms = new;
 679
 680                         return new;
 681                 }
 682
 683                 free(new);
 684         }
 685
 686         return NULL;
 687 }
 688
 689 int uh_auth_check(
 690         struct client *cl, struct http_request *req, struct path_info *pi
 691 ) {
 692         int i, plen, rlen, protected;
 693         char buffer[UH_LIMIT_MSGHEAD];
 694         char *user = NULL;
 695         char *pass = NULL;
 696
 697         struct auth_realm *realm = NULL;
 698
 699         plen = strlen(pi->name);
 700         protected = 0;
 701
 702         /* check whether at least one realm covers the requested url */
 703         for( realm = uh_realms; realm; realm = realm->next )
 704         {
 705                 rlen = strlen(realm->path);
 706
 707                 if( (plen >= rlen) && !strncasecmp(pi->name, realm->path, rlen) )
 708                 {
 709                         req->realm = realm;
 710                         protected = 1;
 711                         break;
 712                 }
 713         }
 714
 715         /* requested resource is covered by a realm */
 716         if( protected )
 717         {
 718                 /* try to get client auth info */
 719                 foreach_header(i, req->headers)
 720                 {
 721                         if( !strcasecmp(req->headers[i], "Authorization") &&
 722                                 (strlen(req->headers[i+1]) > 6) &&
 723                                 !strncasecmp(req->headers[i+1], "Basic ", 6)
 724                         ) {
 725                                 memset(buffer, 0, sizeof(buffer));
 726                                 uh_b64decode(buffer, sizeof(buffer) - 1,
 727                                         (unsigned char *) &req->headers[i+1][6],
 728                                         strlen(req->headers[i+1]) - 6);
 729
 730                                 if( (pass = strchr(buffer, ':')) != NULL )
 731                                 {
 732                                         user = buffer;
 733                                         *pass++ = 0;
 734                                 }
 735
 736                                 break;
 737                         }
 738                 }
 739
 740                 /* have client auth */
 741                 if( user && pass )
 742                 {
 743                         /* find matching realm */
 744                         for( realm = uh_realms; realm; realm = realm->next )
 745                         {
 746                                 rlen = strlen(realm->path);
 747
 748                                 if( (plen >= rlen) &&
 749                                     !strncasecmp(pi->name, realm->path, rlen) &&
 750                                     !strcmp(user, realm->user)
 751                                 ) {
 752                                         req->realm = realm;
 753                                         break;
 754                                 }
 755                         }
 756
 757                         /* found a realm matching the username */
 758                         if( realm )
 759                         {
 760                                 /* is a crypt passwd */
 761                                 if( realm->pass[0] == '$' )
 762                                         pass = crypt(pass, realm->pass);
 763
 764                                 /* check user pass */
 765                                 if( !strcmp(pass, realm->pass) )
 766                                         return 1;
 767                         }
 768                 }
 769
 770                 /* 401 */
 771                 uh_http_sendf(cl, NULL,
 772                         "HTTP/%.1f 401 Authorization Required\r\n"
 773                         "WWW-Authenticate: Basic realm=\"%s\"\r\n"
 774                         "Content-Type: text/plain\r\n"
 775                         "Content-Length: 23\r\n\r\n"
 776                         "Authorization Required\n",
 777                                 req->version, cl->server->conf->realm
 778                 );
 779
 780                 return 0;
 781         }
 782
 783         return 1;
 784 }
 785
 786
 787 static struct listener *uh_listeners = NULL;
 788 static struct client *uh_clients = NULL;
 789
 790 struct listener * uh_listener_add(int sock, struct config *conf)
 791 {
 792         struct listener *new = NULL;
 793         socklen_t sl;
 794
 795         if( (new = (struct listener *)malloc(sizeof(struct listener))) != NULL )
 796         {
 797                 memset(new, 0, sizeof(struct listener));
 798
 799                 new->socket = sock;
 800                 new->conf   = conf;
 801
 802                 /* get local endpoint addr */
 803                 sl = sizeof(struct sockaddr_in6);
 804                 memset(&(new->addr), 0, sl);
 805                 getsockname(sock, (struct sockaddr *) &(new->addr), &sl);
 806
 807                 new->next = uh_listeners;
 808                 uh_listeners = new;
 809
 810                 return new;
 811         }
 812
 813         return NULL;
 814 }
 815
 816 struct listener * uh_listener_lookup(int sock)
 817 {
 818         struct listener *cur = NULL;
 819
 820         for( cur = uh_listeners; cur; cur = cur->next )
 821                 if( cur->socket == sock )
 822                         return cur;
 823
 824         return NULL;
 825 }
 826
 827
 828 struct client * uh_client_add(int sock, struct listener *serv)
 829 {
 830         struct client *new = NULL;
 831         socklen_t sl;
 832
 833         if( (new = (struct client *)malloc(sizeof(struct client))) != NULL )
 834         {
 835                 memset(new, 0, sizeof(struct client));
 836
 837                 new->socket = sock;
 838                 new->server = serv;
 839
 840                 /* get remote endpoint addr */
 841                 sl = sizeof(struct sockaddr_in6);
 842                 memset(&(new->peeraddr), 0, sl);
 843                 getpeername(sock, (struct sockaddr *) &(new->peeraddr), &sl);
 844
 845                 /* get local endpoint addr */
 846                 sl = sizeof(struct sockaddr_in6);
 847                 memset(&(new->servaddr), 0, sl);
 848                 getsockname(sock, (struct sockaddr *) &(new->servaddr), &sl);
 849
 850                 new->next = uh_clients;
 851                 uh_clients = new;
 852         }
 853
 854         return new;
 855 }
 856
 857 struct client * uh_client_lookup(int sock)
 858 {
 859         struct client *cur = NULL;
 860
 861         for( cur = uh_clients; cur; cur = cur->next )
 862                 if( cur->socket == sock )
 863                         return cur;
 864
 865         return NULL;
 866 }
 867
 868 void uh_client_remove(int sock)
 869 {
 870         struct client *cur = NULL;
 871         struct client *prv = NULL;
 872
 873         for( cur = uh_clients; cur; prv = cur, cur = cur->next )
 874         {
 875                 if( cur->socket == sock )
 876                 {
 877                         if( prv )
 878                                 prv->next = cur->next;
 879                         else
 880                                 uh_clients = cur->next;
 881
 882                         free(cur);
 883                         break;
 884                 }
 885         }
 886 }
 887
 888
 889 #ifdef HAVE_CGI
 890 static struct interpreter *uh_interpreters = NULL;
 891
 892 struct interpreter * uh_interpreter_add(const char *extn, const char *path)
 893 {
 894         struct interpreter *new = NULL;
 895
 896         if( (new = (struct interpreter *)
 897                         malloc(sizeof(struct interpreter))) != NULL )
 898         {
 899                 memset(new, 0, sizeof(struct interpreter));
 900
 901                 memcpy(new->extn, extn, min(strlen(extn), sizeof(new->extn)-1));
 902                 memcpy(new->path, path, min(strlen(path), sizeof(new->path)-1));
 903
 904                 new->next = uh_interpreters;
 905                 uh_interpreters = new;
 906
 907                 return new;
 908         }
 909
 910         return NULL;
 911 }
 912
 913 struct interpreter * uh_interpreter_lookup(const char *path)
 914 {
 915         struct interpreter *cur = NULL;
 916         const char *e;
 917
 918         for( cur = uh_interpreters; cur; cur = cur->next )
 919         {
 920                 e = &path[max(strlen(path) - strlen(cur->extn), 0)];
 921
 922                 if( !strcmp(e, cur->extn) )
 923                         return cur;
 924         }
 925
 926         return NULL;
 927 }
 928 #endif