external/bsd/libbind/dist/resolv/res_init.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 1985, 1989, 1993
   5  *    The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 /*
  37  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  38  *
  39  * Permission to use, copy, modify, and distribute this software for any
  40  * purpose with or without fee is hereby granted, provided that the above
  41  * copyright notice and this permission notice appear in all copies, and that
  42  * the name of Digital Equipment Corporation not be used in advertising or
  43  * publicity pertaining to distribution of the document or software without
  44  * specific, written prior permission.
  45  *
  46  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  47  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  48  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  49  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  50  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  51  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  52  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  53  * SOFTWARE.
  54  */
  55
  56 /*
  57  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  58  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  59  *
  60  * Permission to use, copy, modify, and distribute this software for any
  61  * purpose with or without fee is hereby granted, provided that the above
  62  * copyright notice and this permission notice appear in all copies.
  63  *
  64  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  65  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  66  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  67  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  68  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  69  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  70  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  71  */
  72
  73 #if defined(LIBC_SCCS) && !defined(lint)
  74 static const char sccsid[] = "@(#)res_init.c    8.1 (Berkeley) 6/7/93";
  75 static const char rcsid[] = "Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp";
  76 #endif /* LIBC_SCCS and not lint */
  77
  78 #include "port_before.h"
  79
  80 #include <sys/types.h>
  81 #include <sys/param.h>
  82 #include <sys/socket.h>
  83 #include <sys/time.h>
  84
  85 #include <netinet/in.h>
  86 #include <arpa/inet.h>
  87 #include <arpa/nameser.h>
  88
  89 #include <ctype.h>
  90 #include <stdio.h>
  91 #include <stdlib.h>
  92 #include <string.h>
  93 #include <unistd.h>
  94 #include <netdb.h>
  95
  96 #ifndef HAVE_MD5
  97 # include "../dst/md5.h"
  98 #else
  99 # ifdef SOLARIS2
 100 #  include <sys/md5.h>
 101 # endif
 102 #endif
 103 #ifndef _MD5_H_
 104 # define _MD5_H_ 1      /*%< make sure we do not include rsaref md5.h file */
 105 #endif
 106
 107 #include "port_after.h"
 108
 109 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
 110 #include <resolv.h>
 111
 112 #include "res_private.h"
 113
 114 /*% Options.  Should all be left alone. */
 115 #define RESOLVSORT
 116 #define DEBUG
 117
 118 #ifdef SOLARIS2
 119 #include <sys/systeminfo.h>
 120 #endif
 121
 122 static void res_setoptions __P((res_state, const char *, const char *));
 123
 124 #ifdef RESOLVSORT
 125 static const char sort_mask[] = "/&";
 126 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
 127 static u_int32_t net_mask __P((struct in_addr));
 128 #endif
 129
 130 #if !defined(isascii)   /*%< XXX - could be a function */
 131 # define isascii(c) (!(c & 0200))
 132 #endif
 133
 134 /*
 135  * Resolver state default settings.
 136  */
 137
 138 /*%
 139  * Set up default settings.  If the configuration file exist, the values
 140  * there will have precedence.  Otherwise, the server address is set to
 141  * INADDR_ANY and the default domain name comes from the gethostname().
 142  *
 143  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
 144  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
 145  * since it was noted that INADDR_ANY actually meant ``the first interface
 146  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
 147  * it had to be "up" in order for you to reach your own name server.  It
 148  * was later decided that since the recommended practice is to always
 149  * install local static routes through 127.0.0.1 for all your network
 150  * interfaces, that we could solve this problem without a code change.
 151  *
 152  * The configuration file should always be used, since it is the only way
 153  * to specify a default domain.  If you are running a server on your local
 154  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
 155  * in the configuration file.
 156  *
 157  * Return 0 if completes successfully, -1 on error
 158  */
 159 int
 160 res_ninit(res_state statp) {
 161         extern int __res_vinit(res_state, int);
 162
 163         return (__res_vinit(statp, 0));
 164 }
 165
 166 /*% This function has to be reachable by res_data.c but not publically. */
 167 int
 168 __res_vinit(res_state statp, int preinit) {
 169         register FILE *fp;
 170         register char *cp, **pp;
 171         register int n;
 172         char buf[BUFSIZ];
 173         int nserv = 0;    /*%< number of nameserver records read from file */
 174         int haveenv = 0;
 175         int havesearch = 0;
 176 #ifdef RESOLVSORT
 177         int nsort = 0;
 178         char *net;
 179 #endif
 180         int dots;
 181         union res_sockaddr_union u[2];
 182         int maxns = MAXNS;
 183
 184         RES_SET_H_ERRNO(statp, 0);
 185         if (statp->_u._ext.ext != NULL)
 186                 res_ndestroy(statp);
 187
 188         if (!preinit) {
 189                 statp->retrans = RES_TIMEOUT;
 190                 statp->retry = RES_DFLRETRY;
 191                 statp->options = RES_DEFAULT;
 192                 res_rndinit(statp);
 193                 statp->id = res_nrandomid(statp);
 194         }
 195
 196         memset(u, 0, sizeof(u));
 197 #ifdef USELOOPBACK
 198         u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
 199 #else
 200         u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
 201 #endif
 202         u[nserv].sin.sin_family = AF_INET;
 203         u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
 204 #ifdef HAVE_SA_LEN
 205         u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
 206 #endif
 207         nserv++;
 208 #ifdef HAS_INET6_STRUCTS
 209 #ifdef USELOOPBACK
 210         u[nserv].sin6.sin6_addr = in6addr_loopback;
 211 #else
 212         u[nserv].sin6.sin6_addr = in6addr_any;
 213 #endif
 214         u[nserv].sin6.sin6_family = AF_INET6;
 215         u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
 216 #ifdef HAVE_SA_LEN
 217         u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
 218 #endif
 219         nserv++;
 220 #endif
 221         statp->nscount = 0;
 222         statp->ndots = 1;
 223         statp->pfcode = 0;
 224         statp->_vcsock = -1;
 225         statp->_flags = 0;
 226         statp->qhook = NULL;
 227         statp->rhook = NULL;
 228         statp->_u._ext.nscount = 0;
 229         statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
 230         if (statp->_u._ext.ext != NULL) {
 231                 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
 232                 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
 233                 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
 234                 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
 235         } else {
 236                 /*
 237                  * Historically res_init() rarely, if at all, failed.
 238                  * Examples and applications exist which do not check
 239                  * our return code.  Furthermore several applications
 240                  * simply call us to get the systems domainname.  So
 241                  * rather then immediately fail here we store the
 242                  * failure, which is returned later, in h_errno.  And
 243                  * prevent the collection of 'nameserver' information
 244                  * by setting maxns to 0.  Thus applications that fail
 245                  * to check our return code wont be able to make
 246                  * queries anyhow.
 247                  */
 248                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 249                 maxns = 0;
 250         }
 251 #ifdef RESOLVSORT
 252         statp->nsort = 0;
 253 #endif
 254         res_setservers(statp, u, nserv);
 255
 256 #ifdef  SOLARIS2
 257         /*
 258          * The old libresolv derived the defaultdomain from NIS/NIS+.
 259          * We want to keep this behaviour
 260          */
 261         {
 262                 char buf[sizeof(statp->defdname)], *cp;
 263                 int ret;
 264
 265                 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
 266                         (unsigned int)ret <= sizeof(buf)) {
 267                         if (buf[0] == '+')
 268                                 buf[0] = '.';
 269                         cp = strchr(buf, '.');
 270                         cp = (cp == NULL) ? buf : (cp + 1);
 271                         strncpy(statp->defdname, cp,
 272                                 sizeof(statp->defdname) - 1);
 273                         statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 274                 }
 275         }
 276 #endif  /* SOLARIS2 */
 277
 278         /* Allow user to override the local domain definition */
 279         if ((cp = getenv("LOCALDOMAIN")) != NULL) {
 280                 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 281                 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 282                 haveenv++;
 283
 284                 /*
 285                  * Set search list to be blank-separated strings
 286                  * from rest of env value.  Permits users of LOCALDOMAIN
 287                  * to still have a search list, and anyone to set the
 288                  * one that they want to use as an individual (even more
 289                  * important now that the rfc1535 stuff restricts searches)
 290                  */
 291                 cp = statp->defdname;
 292                 pp = statp->dnsrch;
 293                 *pp++ = cp;
 294                 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
 295                         if (*cp == '\n')        /*%< silly backwards compat */
 296                                 break;
 297                         else if (*cp == ' ' || *cp == '\t') {
 298                                 *cp = 0;
 299                                 n = 1;
 300                         } else if (n) {
 301                                 *pp++ = cp;
 302                                 n = 0;
 303                                 havesearch = 1;
 304                         }
 305                 }
 306                 /* null terminate last domain if there are excess */
 307                 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
 308                         cp++;
 309                 *cp = '\0';
 310                 *pp++ = 0;
 311         }
 312
 313 #define MATCH(line, name) \
 314         (!strncmp(line, name, sizeof(name) - 1) && \
 315         (line[sizeof(name) - 1] == ' ' || \
 316          line[sizeof(name) - 1] == '\t'))
 317
 318         nserv = 0;
 319         if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
 320             /* read the config file */
 321             while (fgets(buf, sizeof(buf), fp) != NULL) {
 322                 /* skip comments */
 323                 if (*buf == ';' || *buf == '#')
 324                         continue;
 325                 /* read default domain name */
 326                 if (MATCH(buf, "domain")) {
 327                     if (haveenv)        /*%< skip if have from environ */
 328                             continue;
 329                     cp = buf + sizeof("domain") - 1;
 330                     while (*cp == ' ' || *cp == '\t')
 331                             cp++;
 332                     if ((*cp == '\0') || (*cp == '\n'))
 333                             continue;
 334                     strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 335                     statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 336                     if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
 337                             *cp = '\0';
 338                     havesearch = 0;
 339                     continue;
 340                 }
 341                 /* set search list */
 342                 if (MATCH(buf, "search")) {
 343                     if (haveenv)        /*%< skip if have from environ */
 344                             continue;
 345                     cp = buf + sizeof("search") - 1;
 346                     while (*cp == ' ' || *cp == '\t')
 347                             cp++;
 348                     if ((*cp == '\0') || (*cp == '\n'))
 349                             continue;
 350                     strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 351                     statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 352                     if ((cp = strchr(statp->defdname, '\n')) != NULL)
 353                             *cp = '\0';
 354                     /*
 355                      * Set search list to be blank-separated strings
 356                      * on rest of line.
 357                      */
 358                     cp = statp->defdname;
 359                     pp = statp->dnsrch;
 360                     *pp++ = cp;
 361                     for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
 362                             if (*cp == ' ' || *cp == '\t') {
 363                                     *cp = 0;
 364                                     n = 1;
 365                             } else if (n) {
 366                                     *pp++ = cp;
 367                                     n = 0;
 368                             }
 369                     }
 370                     /* null terminate last domain if there are excess */
 371                     while (*cp != '\0' && *cp != ' ' && *cp != '\t')
 372                             cp++;
 373                     *cp = '\0';
 374                     *pp++ = 0;
 375                     havesearch = 1;
 376                     continue;
 377                 }
 378                 /* read nameservers to query */
 379                 if (MATCH(buf, "nameserver") && nserv < maxns) {
 380                     struct addrinfo hints, *ai;
 381                     char sbuf[NI_MAXSERV];
 382                     const size_t minsiz =
 383                         sizeof(statp->_u._ext.ext->nsaddrs[0]);
 384
 385                     cp = buf + sizeof("nameserver") - 1;
 386                     while (*cp == ' ' || *cp == '\t')
 387                         cp++;
 388                     cp[strcspn(cp, ";# \t\n")] = '\0';
 389                     if ((*cp != '\0') && (*cp != '\n')) {
 390                         memset(&hints, 0, sizeof(hints));
 391                         hints.ai_family = PF_UNSPEC;
 392                         hints.ai_socktype = SOCK_DGRAM; /*dummy*/
 393                         hints.ai_flags = AI_NUMERICHOST;
 394                         sprintf(sbuf, "%u", NAMESERVER_PORT);
 395                         if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
 396                             ai->ai_addrlen <= minsiz) {
 397                             if (statp->_u._ext.ext != NULL) {
 398                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 399                                     ai->ai_addr, ai->ai_addrlen);
 400                             }
 401                             if (ai->ai_addrlen <=
 402                                 sizeof(statp->nsaddr_list[nserv])) {
 403                                 memcpy(&statp->nsaddr_list[nserv],
 404                                     ai->ai_addr, ai->ai_addrlen);
 405                             } else
 406                                 statp->nsaddr_list[nserv].sin_family = 0;
 407                             freeaddrinfo(ai);
 408                             nserv++;
 409                         }
 410                     }
 411                     continue;
 412                 }
 413 #ifdef RESOLVSORT
 414                 if (MATCH(buf, "sortlist")) {
 415                     struct in_addr a;
 416
 417                     cp = buf + sizeof("sortlist") - 1;
 418                     while (nsort < MAXRESOLVSORT) {
 419                         while (*cp == ' ' || *cp == '\t')
 420                             cp++;
 421                         if (*cp == '\0' || *cp == '\n' || *cp == ';')
 422                             break;
 423                         net = cp;
 424                         while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
 425                                isascii(*cp) && !isspace((unsigned char)*cp))
 426                                 cp++;
 427                         n = *cp;
 428                         *cp = 0;
 429                         if (inet_aton(net, &a)) {
 430                             statp->sort_list[nsort].addr = a;
 431                             if (ISSORTMASK(n)) {
 432                                 *cp++ = n;
 433                                 net = cp;
 434                                 while (*cp && *cp != ';' &&
 435                                         isascii(*cp) &&
 436                                         !isspace((unsigned char)*cp))
 437                                     cp++;
 438                                 n = *cp;
 439                                 *cp = 0;
 440                                 if (inet_aton(net, &a)) {
 441                                     statp->sort_list[nsort].mask = a.s_addr;
 442                                 } else {
 443                                     statp->sort_list[nsort].mask =
 444                                         net_mask(statp->sort_list[nsort].addr);
 445                                 }
 446                             } else {
 447                                 statp->sort_list[nsort].mask =
 448                                     net_mask(statp->sort_list[nsort].addr);
 449                             }
 450                             nsort++;
 451                         }
 452                         *cp = n;
 453                     }
 454                     continue;
 455                 }
 456 #endif
 457                 if (MATCH(buf, "options")) {
 458                     res_setoptions(statp, buf + sizeof("options") - 1, "conf");
 459                     continue;
 460                 }
 461             }
 462             if (nserv > 0)
 463                 statp->nscount = nserv;
 464 #ifdef RESOLVSORT
 465             statp->nsort = nsort;
 466 #endif
 467             (void) fclose(fp);
 468         }
 469 /*
 470  * Last chance to get a nameserver.  This should not normally
 471  * be necessary
 472  */
 473 #ifdef NO_RESOLV_CONF
 474         if(nserv == 0)
 475                 nserv = get_nameservers(statp);
 476 #endif
 477
 478         if (statp->defdname[0] == 0 &&
 479             gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
 480             (cp = strchr(buf, '.')) != NULL)
 481                 strcpy(statp->defdname, cp + 1);
 482
 483         /* find components of local domain that might be searched */
 484         if (havesearch == 0) {
 485                 pp = statp->dnsrch;
 486                 *pp++ = statp->defdname;
 487                 *pp = NULL;
 488
 489                 dots = 0;
 490                 for (cp = statp->defdname; *cp; cp++)
 491                         dots += (*cp == '.');
 492
 493                 cp = statp->defdname;
 494                 while (pp < statp->dnsrch + MAXDFLSRCH) {
 495                         if (dots < LOCALDOMAINPARTS)
 496                                 break;
 497                         cp = strchr(cp, '.') + 1;    /*%< we know there is one */
 498                         *pp++ = cp;
 499                         dots--;
 500                 }
 501                 *pp = NULL;
 502 #ifdef DEBUG
 503                 if (statp->options & RES_DEBUG) {
 504                         printf(";; res_init()... default dnsrch list:\n");
 505                         for (pp = statp->dnsrch; *pp; pp++)
 506                                 printf(";;\t%s\n", *pp);
 507                         printf(";;\t..END..\n");
 508                 }
 509 #endif
 510         }
 511
 512         if ((cp = getenv("RES_OPTIONS")) != NULL)
 513                 res_setoptions(statp, cp, "env");
 514         statp->options |= RES_INIT;
 515         return (statp->res_h_errno);
 516 }
 517
 518 static void
 519 res_setoptions(res_state statp, const char *options, const char *source)
 520 {
 521         const char *cp = options;
 522         int i;
 523         struct __res_state_ext *ext = statp->_u._ext.ext;
 524
 525 #ifdef DEBUG
 526         if (statp->options & RES_DEBUG)
 527                 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
 528                        options, source);
 529 #endif
 530         while (*cp) {
 531                 /* skip leading and inner runs of spaces */
 532                 while (*cp == ' ' || *cp == '\t')
 533                         cp++;
 534                 /* search for and process individual options */
 535                 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
 536                         i = atoi(cp + sizeof("ndots:") - 1);
 537                         if (i <= RES_MAXNDOTS)
 538                                 statp->ndots = i;
 539                         else
 540                                 statp->ndots = RES_MAXNDOTS;
 541 #ifdef DEBUG
 542                         if (statp->options & RES_DEBUG)
 543                                 printf(";;\tndots=%d\n", statp->ndots);
 544 #endif
 545                 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
 546                         i = atoi(cp + sizeof("timeout:") - 1);
 547                         if (i <= RES_MAXRETRANS)
 548                                 statp->retrans = i;
 549                         else
 550                                 statp->retrans = RES_MAXRETRANS;
 551 #ifdef DEBUG
 552                         if (statp->options & RES_DEBUG)
 553                                 printf(";;\ttimeout=%d\n", statp->retrans);
 554 #endif
 555 #ifdef  SOLARIS2
 556                 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
 557                         /*
 558                          * For backward compatibility, 'retrans' is
 559                          * supported as an alias for 'timeout', though
 560                          * without an imposed maximum.
 561                          */
 562                         statp->retrans = atoi(cp + sizeof("retrans:") - 1);
 563                 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
 564                         /*
 565                          * For backward compatibility, 'retry' is
 566                          * supported as an alias for 'attempts', though
 567                          * without an imposed maximum.
 568                          */
 569                         statp->retry = atoi(cp + sizeof("retry:") - 1);
 570 #endif  /* SOLARIS2 */
 571                 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
 572                         i = atoi(cp + sizeof("attempts:") - 1);
 573                         if (i <= RES_MAXRETRY)
 574                                 statp->retry = i;
 575                         else
 576                                 statp->retry = RES_MAXRETRY;
 577 #ifdef DEBUG
 578                         if (statp->options & RES_DEBUG)
 579                                 printf(";;\tattempts=%d\n", statp->retry);
 580 #endif
 581                 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
 582 #ifdef DEBUG
 583                         if (!(statp->options & RES_DEBUG)) {
 584                                 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
 585                                        options, source);
 586                                 statp->options |= RES_DEBUG;
 587                         }
 588                         printf(";;\tdebug\n");
 589 #endif
 590                 } else if (!strncmp(cp, "no_tld_query",
 591                                     sizeof("no_tld_query") - 1) ||
 592                            !strncmp(cp, "no-tld-query",
 593                                     sizeof("no-tld-query") - 1)) {
 594                         statp->options |= RES_NOTLDQUERY;
 595                 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
 596                         statp->options |= RES_USE_INET6;
 597                 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
 598                         statp->options |= RES_ROTATE;
 599                 } else if (!strncmp(cp, "no-check-names",
 600                                     sizeof("no-check-names") - 1)) {
 601                         statp->options |= RES_NOCHECKNAME;
 602                 }
 603 #ifdef RES_USE_EDNS0
 604                 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
 605                         statp->options |= RES_USE_EDNS0;
 606                 }
 607 #endif
 608                 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
 609                         statp->options |= RES_USE_DNAME;
 610                 }
 611                 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
 612                         if (ext == NULL)
 613                                 goto skip;
 614                         cp += sizeof("nibble:") - 1;
 615                         i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
 616                         strncpy(ext->nsuffix, cp, i);
 617                         ext->nsuffix[i] = '\0';
 618                 }
 619                 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
 620                         if (ext == NULL)
 621                                 goto skip;
 622                         cp += sizeof("nibble2:") - 1;
 623                         i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
 624                         strncpy(ext->nsuffix2, cp, i);
 625                         ext->nsuffix2[i] = '\0';
 626                 }
 627                 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
 628                         cp += sizeof("v6revmode:") - 1;
 629                         /* "nibble" and "bitstring" used to be valid */
 630                         if (!strncmp(cp, "single", sizeof("single") - 1)) {
 631                                 statp->options |= RES_NO_NIBBLE2;
 632                         } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
 633                                 statp->options &=
 634                                          ~RES_NO_NIBBLE2;
 635                         }
 636                 }
 637                 else {
 638                         /* XXX - print a warning here? */
 639                 }
 640    skip:
 641                 /* skip to next run of spaces */
 642                 while (*cp && *cp != ' ' && *cp != '\t')
 643                         cp++;
 644         }
 645 }
 646
 647 #ifdef RESOLVSORT
 648 /* XXX - should really support CIDR which means explicit masks always. */
 649 static u_int32_t
 650 net_mask(in)            /*!< XXX - should really use system's version of this  */
 651         struct in_addr in;
 652 {
 653         register u_int32_t i = ntohl(in.s_addr);
 654
 655         if (IN_CLASSA(i))
 656                 return (htonl(IN_CLASSA_NET));
 657         else if (IN_CLASSB(i))
 658                 return (htonl(IN_CLASSB_NET));
 659         return (htonl(IN_CLASSC_NET));
 660 }
 661 #endif
 662
 663 void
 664 res_rndinit(res_state statp)
 665 {
 666         struct timeval now;
 667         u_int32_t u32;
 668         u_int16_t u16;
 669
 670         gettimeofday(&now, NULL);
 671         u32 = now.tv_sec;
 672         memcpy(statp->_rnd, &u32, 4);
 673         u32 = now.tv_usec;
 674         memcpy(statp->_rnd + 4, &u32, 4);
 675         u32 += now.tv_sec;
 676         memcpy(statp->_rnd + 8, &u32, 4);
 677         u16 = getpid();
 678         memcpy(statp->_rnd + 12, &u16, 2);
 679 }
 680
 681 u_int
 682 res_nrandomid(res_state statp) {
 683         struct timeval now;
 684         u_int16_t u16;
 685         MD5_CTX ctx;
 686
 687         gettimeofday(&now, NULL);
 688         u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
 689         memcpy(statp->_rnd + 14, &u16, 2);
 690 #ifndef HAVE_MD5
 691         MD5_Init(&ctx);
 692         MD5_Update(&ctx, statp->_rnd, 16);
 693         MD5_Final(statp->_rnd, &ctx);
 694 #else
 695         MD5Init(&ctx);
 696         MD5Update(&ctx, statp->_rnd, 16);
 697         MD5Final(statp->_rnd, &ctx);
 698 #endif
 699         memcpy(&u16, statp->_rnd + 14, 2);
 700         return ((u_int) u16);
 701 }
 702
 703 /*%
 704  * This routine is for closing the socket if a virtual circuit is used and
 705  * the program wants to close it.  This provides support for endhostent()
 706  * which expects to close the socket.
 707  *
 708  * This routine is not expected to be user visible.
 709  */
 710 void
 711 res_nclose(res_state statp) {
 712         int ns;
 713
 714         if (statp->_vcsock >= 0) {
 715                 (void) close(statp->_vcsock);
 716                 statp->_vcsock = -1;
 717                 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
 718         }
 719         for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
 720                 if (statp->_u._ext.nssocks[ns] != -1) {
 721                         (void) close(statp->_u._ext.nssocks[ns]);
 722                         statp->_u._ext.nssocks[ns] = -1;
 723                 }
 724         }
 725 }
 726
 727 void
 728 res_ndestroy(res_state statp) {
 729         res_nclose(statp);
 730         if (statp->_u._ext.ext != NULL)
 731                 free(statp->_u._ext.ext);
 732         statp->options &= ~RES_INIT;
 733         statp->_u._ext.ext = NULL;
 734 }
 735
 736 const char *
 737 res_get_nibblesuffix(res_state statp) {
 738         if (statp->_u._ext.ext)
 739                 return (statp->_u._ext.ext->nsuffix);
 740         return ("ip6.arpa");
 741 }
 742
 743 const char *
 744 res_get_nibblesuffix2(res_state statp) {
 745         if (statp->_u._ext.ext)
 746                 return (statp->_u._ext.ext->nsuffix2);
 747         return ("ip6.int");
 748 }
 749
 750 void
 751 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
 752         int i, nserv;
 753         size_t size;
 754
 755         /* close open servers */
 756         res_nclose(statp);
 757
 758         /* cause rtt times to be forgotten */
 759         statp->_u._ext.nscount = 0;
 760
 761         nserv = 0;
 762         for (i = 0; i < cnt && nserv < MAXNS; i++) {
 763                 switch (set->sin.sin_family) {
 764                 case AF_INET:
 765                         size = sizeof(set->sin);
 766                         if (statp->_u._ext.ext)
 767                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 768                                         &set->sin, size);
 769                         if (size <= sizeof(statp->nsaddr_list[nserv]))
 770                                 memcpy(&statp->nsaddr_list[nserv],
 771                                         &set->sin, size);
 772                         else
 773                                 statp->nsaddr_list[nserv].sin_family = 0;
 774                         nserv++;
 775                         break;
 776
 777 #ifdef HAS_INET6_STRUCTS
 778                 case AF_INET6:
 779                         size = sizeof(set->sin6);
 780                         if (statp->_u._ext.ext)
 781                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 782                                         &set->sin6, size);
 783                         if (size <= sizeof(statp->nsaddr_list[nserv]))
 784                                 memcpy(&statp->nsaddr_list[nserv],
 785                                         &set->sin6, size);
 786                         else
 787                                 statp->nsaddr_list[nserv].sin_family = 0;
 788                         nserv++;
 789                         break;
 790 #endif
 791
 792                 default:
 793                         break;
 794                 }
 795                 set++;
 796         }
 797         statp->nscount = nserv;
 798
 799 }
 800
 801 int
 802 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
 803         int i;
 804         size_t size;
 805         u_int16_t family;
 806
 807         for (i = 0; i < statp->nscount && i < cnt; i++) {
 808                 if (statp->_u._ext.ext)
 809                         family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
 810                 else
 811                         family = statp->nsaddr_list[i].sin_family;
 812
 813                 switch (family) {
 814                 case AF_INET:
 815                         size = sizeof(set->sin);
 816                         if (statp->_u._ext.ext)
 817                                 memcpy(&set->sin,
 818                                        &statp->_u._ext.ext->nsaddrs[i],
 819                                        size);
 820                         else
 821                                 memcpy(&set->sin, &statp->nsaddr_list[i],
 822                                        size);
 823                         break;
 824
 825 #ifdef HAS_INET6_STRUCTS
 826                 case AF_INET6:
 827                         size = sizeof(set->sin6);
 828                         if (statp->_u._ext.ext)
 829                                 memcpy(&set->sin6,
 830                                        &statp->_u._ext.ext->nsaddrs[i],
 831                                        size);
 832                         else
 833                                 memcpy(&set->sin6, &statp->nsaddr_list[i],
 834                                        size);
 835                         break;
 836 #endif
 837
 838                 default:
 839                         set->sin.sin_family = 0;
 840                         break;
 841                 }
 842                 set++;
 843         }
 844         return (statp->nscount);
 845 }
 846
 847 /*! \file */