contrib/bind-9.3/lib/bind/resolv/res_init.c

   1 /*
   2  * Copyright (c) 1985, 1989, 1993
   3  *    The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  36  *
  37  * Permission to use, copy, modify, and distribute this software for any
  38  * purpose with or without fee is hereby granted, provided that the above
  39  * copyright notice and this permission notice appear in all copies, and that
  40  * the name of Digital Equipment Corporation not be used in advertising or
  41  * publicity pertaining to distribution of the document or software without
  42  * specific, written prior permission.
  43  *
  44  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  45  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  46  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  47  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  48  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  49  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  50  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  51  * SOFTWARE.
  52  */
  53
  54 /*
  55  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  56  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  57  *
  58  * Permission to use, copy, modify, and distribute this software for any
  59  * purpose with or without fee is hereby granted, provided that the above
  60  * copyright notice and this permission notice appear in all copies.
  61  *
  62  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  63  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  64  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  65  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  66  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  67  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  68  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  69  */
  70
  71 #if defined(LIBC_SCCS) && !defined(lint)
  72 static const char sccsid[] = "@(#)res_init.c    8.1 (Berkeley) 6/7/93";
  73 static const char rcsid[] = "$Id: res_init.c,v 1.9.2.5.4.6 2006/08/30 23:23:01 marka Exp $";
  74 #endif /* LIBC_SCCS and not lint */
  75
  76 #include "port_before.h"
  77
  78 #include <sys/types.h>
  79 #include <sys/param.h>
  80 #include <sys/socket.h>
  81 #include <sys/time.h>
  82
  83 #include <netinet/in.h>
  84 #include <arpa/inet.h>
  85 #include <arpa/nameser.h>
  86
  87 #include <ctype.h>
  88 #include <stdio.h>
  89 #include <stdlib.h>
  90 #include <string.h>
  91 #include <unistd.h>
  92 #include <netdb.h>
  93
  94 #include "port_after.h"
  95
  96 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
  97 #include <resolv.h>
  98
  99 #include "res_private.h"
 100
 101 /* Options.  Should all be left alone. */
 102 #define RESOLVSORT
 103 #define DEBUG
 104
 105 #ifdef SOLARIS2
 106 #include <sys/systeminfo.h>
 107 #endif
 108
 109 static void res_setoptions __P((res_state, const char *, const char *));
 110
 111 #ifdef RESOLVSORT
 112 static const char sort_mask[] = "/&";
 113 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
 114 static u_int32_t net_mask __P((struct in_addr));
 115 #endif
 116
 117 #if !defined(isascii)   /* XXX - could be a function */
 118 # define isascii(c) (!(c & 0200))
 119 #endif
 120
 121 /*
 122  * Resolver state default settings.
 123  */
 124
 125 /*
 126  * Set up default settings.  If the configuration file exist, the values
 127  * there will have precedence.  Otherwise, the server address is set to
 128  * INADDR_ANY and the default domain name comes from the gethostname().
 129  *
 130  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
 131  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
 132  * since it was noted that INADDR_ANY actually meant ``the first interface
 133  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
 134  * it had to be "up" in order for you to reach your own name server.  It
 135  * was later decided that since the recommended practice is to always
 136  * install local static routes through 127.0.0.1 for all your network
 137  * interfaces, that we could solve this problem without a code change.
 138  *
 139  * The configuration file should always be used, since it is the only way
 140  * to specify a default domain.  If you are running a server on your local
 141  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
 142  * in the configuration file.
 143  *
 144  * Return 0 if completes successfully, -1 on error
 145  */
 146 int
 147 res_ninit(res_state statp) {
 148         extern int __res_vinit(res_state, int);
 149
 150         return (__res_vinit(statp, 0));
 151 }
 152
 153 /* This function has to be reachable by res_data.c but not publically. */
 154 int
 155 __res_vinit(res_state statp, int preinit) {
 156         register FILE *fp;
 157         register char *cp, **pp;
 158         register int n;
 159         char buf[BUFSIZ];
 160         int nserv = 0;    /* number of nameserver records read from file */
 161         int haveenv = 0;
 162         int havesearch = 0;
 163 #ifdef RESOLVSORT
 164         int nsort = 0;
 165         char *net;
 166 #endif
 167         int dots;
 168         union res_sockaddr_union u[2];
 169
 170         if (statp->_u._ext.ext != NULL)
 171                 res_ndestroy(statp);
 172
 173         if (!preinit) {
 174                 statp->retrans = RES_TIMEOUT;
 175                 statp->retry = RES_DFLRETRY;
 176                 statp->options = RES_DEFAULT;
 177                 statp->id = res_randomid();
 178         }
 179
 180         memset(u, 0, sizeof(u));
 181 #ifdef USELOOPBACK
 182         u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
 183 #else
 184         u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
 185 #endif
 186         u[nserv].sin.sin_family = AF_INET;
 187         u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
 188 #ifdef HAVE_SA_LEN
 189         u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
 190 #endif
 191         nserv++;
 192 #ifdef HAS_INET6_STRUCTS
 193 #ifdef USELOOPBACK
 194         u[nserv].sin6.sin6_addr = in6addr_loopback;
 195 #else
 196         u[nserv].sin6.sin6_addr = in6addr_any;
 197 #endif
 198         u[nserv].sin6.sin6_family = AF_INET6;
 199         u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
 200 #ifdef HAVE_SA_LEN
 201         u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
 202 #endif
 203         nserv++;
 204 #endif
 205         statp->nscount = 0;
 206         statp->ndots = 1;
 207         statp->pfcode = 0;
 208         statp->_vcsock = -1;
 209         statp->_flags = 0;
 210         statp->qhook = NULL;
 211         statp->rhook = NULL;
 212         statp->_u._ext.nscount = 0;
 213         statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
 214         if (statp->_u._ext.ext != NULL) {
 215                 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
 216                 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
 217                 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
 218                 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
 219         } else
 220                 return (-1);
 221 #ifdef RESOLVSORT
 222         statp->nsort = 0;
 223 #endif
 224         res_setservers(statp, u, nserv);
 225
 226 #ifdef  SOLARIS2
 227         /*
 228          * The old libresolv derived the defaultdomain from NIS/NIS+.
 229          * We want to keep this behaviour
 230          */
 231         {
 232                 char buf[sizeof(statp->defdname)], *cp;
 233                 int ret;
 234
 235                 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
 236                         (unsigned int)ret <= sizeof(buf)) {
 237                         if (buf[0] == '+')
 238                                 buf[0] = '.';
 239                         cp = strchr(buf, '.');
 240                         cp = (cp == NULL) ? buf : (cp + 1);
 241                         if (strlen(cp) >= sizeof(statp->defdname))
 242                                 goto freedata;
 243                         strcpy(statp->defdname, cp);
 244                 }
 245         }
 246 #endif  /* SOLARIS2 */
 247
 248         /* Allow user to override the local domain definition */
 249         if ((cp = getenv("LOCALDOMAIN")) != NULL) {
 250                 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 251                 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 252                 haveenv++;
 253
 254                 /*
 255                  * Set search list to be blank-separated strings
 256                  * from rest of env value.  Permits users of LOCALDOMAIN
 257                  * to still have a search list, and anyone to set the
 258                  * one that they want to use as an individual (even more
 259                  * important now that the rfc1535 stuff restricts searches)
 260                  */
 261                 cp = statp->defdname;
 262                 pp = statp->dnsrch;
 263                 *pp++ = cp;
 264                 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
 265                         if (*cp == '\n')        /* silly backwards compat */
 266                                 break;
 267                         else if (*cp == ' ' || *cp == '\t') {
 268                                 *cp = 0;
 269                                 n = 1;
 270                         } else if (n) {
 271                                 *pp++ = cp;
 272                                 n = 0;
 273                                 havesearch = 1;
 274                         }
 275                 }
 276                 /* null terminate last domain if there are excess */
 277                 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
 278                         cp++;
 279                 *cp = '\0';
 280                 *pp++ = 0;
 281         }
 282
 283 #define MATCH(line, name) \
 284         (!strncmp(line, name, sizeof(name) - 1) && \
 285         (line[sizeof(name) - 1] == ' ' || \
 286          line[sizeof(name) - 1] == '\t'))
 287
 288         nserv = 0;
 289         if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
 290             /* read the config file */
 291             while (fgets(buf, sizeof(buf), fp) != NULL) {
 292                 /* skip comments */
 293                 if (*buf == ';' || *buf == '#')
 294                         continue;
 295                 /* read default domain name */
 296                 if (MATCH(buf, "domain")) {
 297                     if (haveenv)        /* skip if have from environ */
 298                             continue;
 299                     cp = buf + sizeof("domain") - 1;
 300                     while (*cp == ' ' || *cp == '\t')
 301                             cp++;
 302                     if ((*cp == '\0') || (*cp == '\n'))
 303                             continue;
 304                     strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 305                     statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 306                     if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
 307                             *cp = '\0';
 308                     havesearch = 0;
 309                     continue;
 310                 }
 311                 /* set search list */
 312                 if (MATCH(buf, "search")) {
 313                     if (haveenv)        /* skip if have from environ */
 314                             continue;
 315                     cp = buf + sizeof("search") - 1;
 316                     while (*cp == ' ' || *cp == '\t')
 317                             cp++;
 318                     if ((*cp == '\0') || (*cp == '\n'))
 319                             continue;
 320                     strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 321                     statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 322                     if ((cp = strchr(statp->defdname, '\n')) != NULL)
 323                             *cp = '\0';
 324                     /*
 325                      * Set search list to be blank-separated strings
 326                      * on rest of line.
 327                      */
 328                     cp = statp->defdname;
 329                     pp = statp->dnsrch;
 330                     *pp++ = cp;
 331                     for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
 332                             if (*cp == ' ' || *cp == '\t') {
 333                                     *cp = 0;
 334                                     n = 1;
 335                             } else if (n) {
 336                                     *pp++ = cp;
 337                                     n = 0;
 338                             }
 339                     }
 340                     /* null terminate last domain if there are excess */
 341                     while (*cp != '\0' && *cp != ' ' && *cp != '\t')
 342                             cp++;
 343                     *cp = '\0';
 344                     *pp++ = 0;
 345                     havesearch = 1;
 346                     continue;
 347                 }
 348                 /* read nameservers to query */
 349                 if (MATCH(buf, "nameserver") && nserv < MAXNS) {
 350                     struct addrinfo hints, *ai;
 351                     char sbuf[NI_MAXSERV];
 352                     const size_t minsiz =
 353                         sizeof(statp->_u._ext.ext->nsaddrs[0]);
 354
 355                     cp = buf + sizeof("nameserver") - 1;
 356                     while (*cp == ' ' || *cp == '\t')
 357                         cp++;
 358                     cp[strcspn(cp, ";# \t\n")] = '\0';
 359                     if ((*cp != '\0') && (*cp != '\n')) {
 360                         memset(&hints, 0, sizeof(hints));
 361                         hints.ai_family = PF_UNSPEC;
 362                         hints.ai_socktype = SOCK_DGRAM; /*dummy*/
 363                         hints.ai_flags = AI_NUMERICHOST;
 364                         sprintf(sbuf, "%u", NAMESERVER_PORT);
 365                         if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
 366                             ai->ai_addrlen <= minsiz) {
 367                             if (statp->_u._ext.ext != NULL) {
 368                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 369                                     ai->ai_addr, ai->ai_addrlen);
 370                             }
 371                             if (ai->ai_addrlen <=
 372                                 sizeof(statp->nsaddr_list[nserv])) {
 373                                 memcpy(&statp->nsaddr_list[nserv],
 374                                     ai->ai_addr, ai->ai_addrlen);
 375                             } else
 376                                 statp->nsaddr_list[nserv].sin_family = 0;
 377                             freeaddrinfo(ai);
 378                             nserv++;
 379                         }
 380                     }
 381                     continue;
 382                 }
 383 #ifdef RESOLVSORT
 384                 if (MATCH(buf, "sortlist")) {
 385                     struct in_addr a;
 386
 387                     cp = buf + sizeof("sortlist") - 1;
 388                     while (nsort < MAXRESOLVSORT) {
 389                         while (*cp == ' ' || *cp == '\t')
 390                             cp++;
 391                         if (*cp == '\0' || *cp == '\n' || *cp == ';')
 392                             break;
 393                         net = cp;
 394                         while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
 395                                isascii(*cp) && !isspace((unsigned char)*cp))
 396                                 cp++;
 397                         n = *cp;
 398                         *cp = 0;
 399                         if (inet_aton(net, &a)) {
 400                             statp->sort_list[nsort].addr = a;
 401                             if (ISSORTMASK(n)) {
 402                                 *cp++ = n;
 403                                 net = cp;
 404                                 while (*cp && *cp != ';' &&
 405                                         isascii(*cp) &&
 406                                         !isspace((unsigned char)*cp))
 407                                     cp++;
 408                                 n = *cp;
 409                                 *cp = 0;
 410                                 if (inet_aton(net, &a)) {
 411                                     statp->sort_list[nsort].mask = a.s_addr;
 412                                 } else {
 413                                     statp->sort_list[nsort].mask =
 414                                         net_mask(statp->sort_list[nsort].addr);
 415                                 }
 416                             } else {
 417                                 statp->sort_list[nsort].mask =
 418                                     net_mask(statp->sort_list[nsort].addr);
 419                             }
 420                             nsort++;
 421                         }
 422                         *cp = n;
 423                     }
 424                     continue;
 425                 }
 426 #endif
 427                 if (MATCH(buf, "options")) {
 428                     res_setoptions(statp, buf + sizeof("options") - 1, "conf");
 429                     continue;
 430                 }
 431             }
 432             if (nserv > 0)
 433                 statp->nscount = nserv;
 434 #ifdef RESOLVSORT
 435             statp->nsort = nsort;
 436 #endif
 437             (void) fclose(fp);
 438         }
 439 /*
 440  * Last chance to get a nameserver.  This should not normally
 441  * be necessary
 442  */
 443 #ifdef NO_RESOLV_CONF
 444         if(nserv == 0)
 445                 nserv = get_nameservers(statp);
 446 #endif
 447
 448         if (statp->defdname[0] == 0 &&
 449             gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
 450             (cp = strchr(buf, '.')) != NULL)
 451                 strcpy(statp->defdname, cp + 1);
 452
 453         /* find components of local domain that might be searched */
 454         if (havesearch == 0) {
 455                 pp = statp->dnsrch;
 456                 *pp++ = statp->defdname;
 457                 *pp = NULL;
 458
 459                 dots = 0;
 460                 for (cp = statp->defdname; *cp; cp++)
 461                         dots += (*cp == '.');
 462
 463                 cp = statp->defdname;
 464                 while (pp < statp->dnsrch + MAXDFLSRCH) {
 465                         if (dots < LOCALDOMAINPARTS)
 466                                 break;
 467                         cp = strchr(cp, '.') + 1;    /* we know there is one */
 468                         *pp++ = cp;
 469                         dots--;
 470                 }
 471                 *pp = NULL;
 472 #ifdef DEBUG
 473                 if (statp->options & RES_DEBUG) {
 474                         printf(";; res_init()... default dnsrch list:\n");
 475                         for (pp = statp->dnsrch; *pp; pp++)
 476                                 printf(";;\t%s\n", *pp);
 477                         printf(";;\t..END..\n");
 478                 }
 479 #endif
 480         }
 481
 482         if ((cp = getenv("RES_OPTIONS")) != NULL)
 483                 res_setoptions(statp, cp, "env");
 484         statp->options |= RES_INIT;
 485         return (0);
 486
 487 #ifdef  SOLARIS2
 488  freedata:
 489         if (statp->_u._ext.ext != NULL) {
 490                 free(statp->_u._ext.ext);
 491                 statp->_u._ext.ext = NULL;
 492         }
 493         return (-1);
 494 #endif
 495 }
 496
 497 static void
 498 res_setoptions(res_state statp, const char *options, const char *source)
 499 {
 500         const char *cp = options;
 501         int i;
 502         struct __res_state_ext *ext = statp->_u._ext.ext;
 503
 504 #ifdef DEBUG
 505         if (statp->options & RES_DEBUG)
 506                 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
 507                        options, source);
 508 #endif
 509         while (*cp) {
 510                 /* skip leading and inner runs of spaces */
 511                 while (*cp == ' ' || *cp == '\t')
 512                         cp++;
 513                 /* search for and process individual options */
 514                 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
 515                         i = atoi(cp + sizeof("ndots:") - 1);
 516                         if (i <= RES_MAXNDOTS)
 517                                 statp->ndots = i;
 518                         else
 519                                 statp->ndots = RES_MAXNDOTS;
 520 #ifdef DEBUG
 521                         if (statp->options & RES_DEBUG)
 522                                 printf(";;\tndots=%d\n", statp->ndots);
 523 #endif
 524                 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
 525                         i = atoi(cp + sizeof("timeout:") - 1);
 526                         if (i <= RES_MAXRETRANS)
 527                                 statp->retrans = i;
 528                         else
 529                                 statp->retrans = RES_MAXRETRANS;
 530 #ifdef DEBUG
 531                         if (statp->options & RES_DEBUG)
 532                                 printf(";;\ttimeout=%d\n", statp->retrans);
 533 #endif
 534 #ifdef  SOLARIS2
 535                 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
 536                         /*
 537                          * For backward compatibility, 'retrans' is
 538                          * supported as an alias for 'timeout', though
 539                          * without an imposed maximum.
 540                          */
 541                         statp->retrans = atoi(cp + sizeof("retrans:") - 1);
 542                 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
 543                         /*
 544                          * For backward compatibility, 'retry' is
 545                          * supported as an alias for 'attempts', though
 546                          * without an imposed maximum.
 547                          */
 548                         statp->retry = atoi(cp + sizeof("retry:") - 1);
 549 #endif  /* SOLARIS2 */
 550                 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
 551                         i = atoi(cp + sizeof("attempts:") - 1);
 552                         if (i <= RES_MAXRETRY)
 553                                 statp->retry = i;
 554                         else
 555                                 statp->retry = RES_MAXRETRY;
 556 #ifdef DEBUG
 557                         if (statp->options & RES_DEBUG)
 558                                 printf(";;\tattempts=%d\n", statp->retry);
 559 #endif
 560                 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
 561 #ifdef DEBUG
 562                         if (!(statp->options & RES_DEBUG)) {
 563                                 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
 564                                        options, source);
 565                                 statp->options |= RES_DEBUG;
 566                         }
 567                         printf(";;\tdebug\n");
 568 #endif
 569                 } else if (!strncmp(cp, "no_tld_query",
 570                                     sizeof("no_tld_query") - 1) ||
 571                            !strncmp(cp, "no-tld-query",
 572                                     sizeof("no-tld-query") - 1)) {
 573                         statp->options |= RES_NOTLDQUERY;
 574                 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
 575                         statp->options |= RES_USE_INET6;
 576                 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
 577                         statp->options |= RES_ROTATE;
 578                 } else if (!strncmp(cp, "no-check-names",
 579                                     sizeof("no-check-names") - 1)) {
 580                         statp->options |= RES_NOCHECKNAME;
 581                 }
 582 #ifdef RES_USE_EDNS0
 583                 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
 584                         statp->options |= RES_USE_EDNS0;
 585                 }
 586 #endif
 587                 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
 588                         statp->options |= RES_USE_DNAME;
 589                 }
 590                 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
 591                         if (ext == NULL)
 592                                 goto skip;
 593                         cp += sizeof("nibble:") - 1;
 594                         i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
 595                         strncpy(ext->nsuffix, cp, i);
 596                         ext->nsuffix[i] = '\0';
 597                 }
 598                 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
 599                         if (ext == NULL)
 600                                 goto skip;
 601                         cp += sizeof("nibble2:") - 1;
 602                         i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
 603                         strncpy(ext->nsuffix2, cp, i);
 604                         ext->nsuffix2[i] = '\0';
 605                 }
 606                 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
 607                         cp += sizeof("v6revmode:") - 1;
 608                         /* "nibble" and "bitstring" used to be valid */
 609                         if (!strncmp(cp, "single", sizeof("single") - 1)) {
 610                                 statp->options |= RES_NO_NIBBLE2;
 611                         } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
 612                                 statp->options &=
 613                                          ~RES_NO_NIBBLE2;
 614                         }
 615                 }
 616                 else {
 617                         /* XXX - print a warning here? */
 618                 }
 619    skip:
 620                 /* skip to next run of spaces */
 621                 while (*cp && *cp != ' ' && *cp != '\t')
 622                         cp++;
 623         }
 624 }
 625
 626 #ifdef RESOLVSORT
 627 /* XXX - should really support CIDR which means explicit masks always. */
 628 static u_int32_t
 629 net_mask(in)            /* XXX - should really use system's version of this */
 630         struct in_addr in;
 631 {
 632         register u_int32_t i = ntohl(in.s_addr);
 633
 634         if (IN_CLASSA(i))
 635                 return (htonl(IN_CLASSA_NET));
 636         else if (IN_CLASSB(i))
 637                 return (htonl(IN_CLASSB_NET));
 638         return (htonl(IN_CLASSC_NET));
 639 }
 640 #endif
 641
 642 u_int
 643 res_randomid(void) {
 644         struct timeval now;
 645
 646         gettimeofday(&now, NULL);
 647         return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
 648 }
 649
 650 /*
 651  * This routine is for closing the socket if a virtual circuit is used and
 652  * the program wants to close it.  This provides support for endhostent()
 653  * which expects to close the socket.
 654  *
 655  * This routine is not expected to be user visible.
 656  */
 657 void
 658 res_nclose(res_state statp) {
 659         int ns;
 660
 661         if (statp->_vcsock >= 0) {
 662                 (void) close(statp->_vcsock);
 663                 statp->_vcsock = -1;
 664                 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
 665         }
 666         for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
 667                 if (statp->_u._ext.nssocks[ns] != -1) {
 668                         (void) close(statp->_u._ext.nssocks[ns]);
 669                         statp->_u._ext.nssocks[ns] = -1;
 670                 }
 671         }
 672 }
 673
 674 void
 675 res_ndestroy(res_state statp) {
 676         res_nclose(statp);
 677         if (statp->_u._ext.ext != NULL)
 678                 free(statp->_u._ext.ext);
 679         statp->options &= ~RES_INIT;
 680         statp->_u._ext.ext = NULL;
 681 }
 682
 683 const char *
 684 res_get_nibblesuffix(res_state statp) {
 685         if (statp->_u._ext.ext)
 686                 return (statp->_u._ext.ext->nsuffix);
 687         return ("ip6.arpa");
 688 }
 689
 690 const char *
 691 res_get_nibblesuffix2(res_state statp) {
 692         if (statp->_u._ext.ext)
 693                 return (statp->_u._ext.ext->nsuffix2);
 694         return ("ip6.int");
 695 }
 696
 697 void
 698 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
 699         int i, nserv;
 700         size_t size;
 701
 702         /* close open servers */
 703         res_nclose(statp);
 704
 705         /* cause rtt times to be forgotten */
 706         statp->_u._ext.nscount = 0;
 707
 708         nserv = 0;
 709         for (i = 0; i < cnt && nserv < MAXNS; i++) {
 710                 switch (set->sin.sin_family) {
 711                 case AF_INET:
 712                         size = sizeof(set->sin);
 713                         if (statp->_u._ext.ext)
 714                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 715                                         &set->sin, size);
 716                         if (size <= sizeof(statp->nsaddr_list[nserv]))
 717                                 memcpy(&statp->nsaddr_list[nserv],
 718                                         &set->sin, size);
 719                         else
 720                                 statp->nsaddr_list[nserv].sin_family = 0;
 721                         nserv++;
 722                         break;
 723
 724 #ifdef HAS_INET6_STRUCTS
 725                 case AF_INET6:
 726                         size = sizeof(set->sin6);
 727                         if (statp->_u._ext.ext)
 728                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 729                                         &set->sin6, size);
 730                         if (size <= sizeof(statp->nsaddr_list[nserv]))
 731                                 memcpy(&statp->nsaddr_list[nserv],
 732                                         &set->sin6, size);
 733                         else
 734                                 statp->nsaddr_list[nserv].sin_family = 0;
 735                         nserv++;
 736                         break;
 737 #endif
 738
 739                 default:
 740                         break;
 741                 }
 742                 set++;
 743         }
 744         statp->nscount = nserv;
 745
 746 }
 747
 748 int
 749 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
 750         int i;
 751         size_t size;
 752         u_int16_t family;
 753
 754         for (i = 0; i < statp->nscount && i < cnt; i++) {
 755                 if (statp->_u._ext.ext)
 756                         family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
 757                 else
 758                         family = statp->nsaddr_list[i].sin_family;
 759
 760                 switch (family) {
 761                 case AF_INET:
 762                         size = sizeof(set->sin);
 763                         if (statp->_u._ext.ext)
 764                                 memcpy(&set->sin,
 765                                        &statp->_u._ext.ext->nsaddrs[i],
 766                                        size);
 767                         else
 768                                 memcpy(&set->sin, &statp->nsaddr_list[i],
 769                                        size);
 770                         break;
 771
 772 #ifdef HAS_INET6_STRUCTS
 773                 case AF_INET6:
 774                         size = sizeof(set->sin6);
 775                         if (statp->_u._ext.ext)
 776                                 memcpy(&set->sin6,
 777                                        &statp->_u._ext.ext->nsaddrs[i],
 778                                        size);
 779                         else
 780                                 memcpy(&set->sin6, &statp->nsaddr_list[i],
 781                                        size);
 782                         break;
 783 #endif
 784
 785                 default:
 786                         set->sin.sin_family = 0;
 787                         break;
 788                 }
 789                 set++;
 790         }
 791         return (statp->nscount);
 792 }