dns.subproj/res_init.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * ++Copyright++ 1985, 1989, 1993
  26  * -
  27  * Copyright (c) 1985, 1989, 1993
  28  *    The Regents of the University of California.  All rights reserved.
  29  *
  30  * Redistribution and use in source and binary forms, with or without
  31  * modification, are permitted provided that the following conditions
  32  * are met:
  33  * 1. Redistributions of source code must retain the above copyright
  34  *    notice, this list of conditions and the following disclaimer.
  35  * 2. Redistributions in binary form must reproduce the above copyright
  36  *    notice, this list of conditions and the following disclaimer in the
  37  *    documentation and/or other materials provided with the distribution.
  38  * 3. All advertising materials mentioning features or use of this software
  39  *    must display the following acknowledgement:
  40  *      This product includes software developed by the University of
  41  *      California, Berkeley and its contributors.
  42  * 4. Neither the name of the University nor the names of its contributors
  43  *    may be used to endorse or promote products derived from this software
  44  *    without specific prior written permission.
  45  *
  46  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  56  * SUCH DAMAGE.
  57  * -
  58  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  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, and that
  63  * the name of Digital Equipment Corporation not be used in advertising or
  64  * publicity pertaining to distribution of the document or software without
  65  * specific, written prior permission.
  66  *
  67  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  68  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  69  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  70  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  71  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  72  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  73  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  74  * SOFTWARE.
  75  * -
  76  * --Copyright--
  77  */
  78
  79 #if defined(LIBC_SCCS) && !defined(lint)
  80 static char sccsid[] = "@(#)res_init.c  8.1 (Berkeley) 6/7/93";
  81 static char rcsid[] = "$Id: res_init.c,v 1.5 2002/03/26 20:12:06 ajn Exp $";
  82 #endif /* LIBC_SCCS and not lint */
  83
  84 #include <sys/param.h>
  85 #include <sys/socket.h>
  86 #include <sys/time.h>
  87 #include <netinet/in.h>
  88 #include <arpa/inet.h>
  89 #include <arpa/nameser.h>
  90
  91 #include <stdio.h>
  92 #include <ctype.h>
  93 #include <resolv.h>
  94 #if defined(BSD) && (BSD >= 199103)
  95 # include <unistd.h>
  96 # include <stdlib.h>
  97 # include <string.h>
  98 #else
  99 # include "portability.h"
 100 #endif
 101
 102 /*-------------------------------------- info about "sortlist" --------------
 103  * Marc Majka           1994/04/16
 104  * Allan Nathanson      1994/10/29 (BIND 4.9.3.x)
 105  *
 106  * NetInfo resolver configuration directory support.
 107  *
 108  * Allow a NetInfo directory to be created in the hierarchy which
 109  * contains the same information as the resolver configuration file.
 110  *
 111  * - The local domain name is stored as the value of the "domain" property.
 112  * - The Internet address(es) of the name server(s) are stored as values
 113  *   of the "nameserver" property.
 114  * - The name server addresses are stored as values of the "nameserver"
 115  *   property.
 116  * - The search list for host-name lookup is stored as values of the
 117  *   "search" property.
 118  * - The sortlist comprised of IP address netmask pairs are stored as
 119  *   values of the "sortlist" property. The IP address and optional netmask
 120  *   should be seperated by a slash (/) or ampersand (&) character.
 121  * - Internal resolver variables can be set from the value of the "options"
 122  *   property.
 123  */
 124 #if defined(__APPLE__) && defined(CONFIGURE_RESOLVER_FROM_NETINFO)
 125 #  include <netinfo/ni.h>
 126 #  define NI_PATH_RESCONF "/locations/resolver"
 127 #  define NI_TIMEOUT 10
 128 static int netinfo_res_init __P((int *haveenv, int *havesearch));
 129 #endif
 130
 131 #if defined(USE_OPTIONS_H)
 132 # include "options.h"
 133 #endif
 134
 135 static void res_setoptions __P((char *, char *));
 136
 137 #ifdef RESOLVSORT
 138 static const char sort_mask[] = "/&";
 139 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
 140 static u_int32_t net_mask __P((struct in_addr));
 141 #endif
 142
 143 #if !defined(isascii)   /* XXX - could be a function */
 144 # define isascii(c) (!(c & 0200))
 145 #endif
 146
 147 /*
 148  * Resolver state default settings.
 149  */
 150
 151 #if defined(__APPLE__)
 152 extern
 153 #endif /* NeXT */
 154 struct __res_state _res;
 155
 156 /*
 157  * Set up default settings.  If the configuration file exist, the values
 158  * there will have precedence.  Otherwise, the server address is set to
 159  * INADDR_ANY and the default domain name comes from the gethostname().
 160  *
 161  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
 162  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
 163  * since it was noted that INADDR_ANY actually meant ``the first interface
 164  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
 165  * it had to be "up" in order for you to reach your own name server.  It
 166  * was later decided that since the recommended practice is to always
 167  * install local static routes through 127.0.0.1 for all your network
 168  * interfaces, that we could solve this problem without a code change.
 169  *
 170  * The configuration file should always be used, since it is the only way
 171  * to specify a default domain.  If you are running a server on your local
 172  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
 173  * in the configuration file.
 174  *
 175  * Return 0 if completes successfully, -1 on error
 176  */
 177 int
 178 res_init()
 179 {
 180         register FILE *fp;
 181         register char *cp, **pp;
 182         register int n;
 183         char buf[BUFSIZ];
 184         int nserv = 0;    /* number of nameserver records read from file */
 185         int haveenv = 0;
 186         int havesearch = 0;
 187 #ifdef RESOLVSORT
 188         int nsort = 0;
 189         char *net;
 190 #endif
 191 #ifndef RFC1535
 192         int dots;
 193 #endif
 194
 195         /*
 196          * These three fields used to be statically initialized.  This made
 197          * it hard to use this code in a shared library.  It is necessary,
 198          * now that we're doing dynamic initialization here, that we preserve
 199          * the old semantics: if an application modifies one of these three
 200          * fields of _res before res_init() is called, res_init() will not
 201          * alter them.  Of course, if an application is setting them to
 202          * _zero_ before calling res_init(), hoping to override what used
 203          * to be the static default, we can't detect it and unexpected results
 204          * will follow.  Zero for any of these fields would make no sense,
 205          * so one can safely assume that the applications were already getting
 206          * unexpected results.
 207          *
 208          * _res.options is tricky since some apps were known to diddle the bits
 209          * before res_init() was first called. We can't replicate that semantic
 210          * with dynamic initialization (they may have turned bits off that are
 211          * set in RES_DEFAULT).  Our solution is to declare such applications
 212          * "broken".  They could fool us by setting RES_INIT but none do (yet).
 213          */
 214         if (!_res.retrans)
 215                 _res.retrans = RES_TIMEOUT;
 216         if (!_res.retry)
 217                 _res.retry = 4;
 218         if (!(_res.options & RES_INIT))
 219                 _res.options = RES_DEFAULT;
 220
 221         /*
 222          * This one used to initialize implicitly to zero, so unless the app
 223          * has set it to something in particular, we can randomize it now.
 224          */
 225         if (!_res.id)
 226                 _res.id = res_randomid();
 227
 228 #ifdef USELOOPBACK
 229         _res.nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
 230 #else
 231         _res.nsaddr.sin_addr.s_addr = INADDR_ANY;
 232 #endif
 233         _res.nsaddr.sin_family = AF_INET;
 234         _res.nsaddr.sin_port = htons(NAMESERVER_PORT);
 235         _res.nscount = 1;
 236         _res.ndots = 1;
 237         _res.pfcode = 0;
 238
 239         /* Allow user to override the local domain definition */
 240         if ((cp = getenv("LOCALDOMAIN")) != NULL) {
 241                 (void)strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 242                 haveenv++;
 243
 244                 /*
 245                  * Set search list to be blank-separated strings
 246                  * from rest of env value.  Permits users of LOCALDOMAIN
 247                  * to still have a search list, and anyone to set the
 248                  * one that they want to use as an individual (even more
 249                  * important now that the rfc1535 stuff restricts searches)
 250                  */
 251                 cp = _res.defdname;
 252                 pp = _res.dnsrch;
 253                 *pp++ = cp;
 254                 for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
 255                         if (*cp == '\n')        /* silly backwards compat */
 256                                 break;
 257                         else if (*cp == ' ' || *cp == '\t') {
 258                                 *cp = 0;
 259                                 n = 1;
 260                         } else if (n) {
 261                                 *pp++ = cp;
 262                                 n = 0;
 263                                 havesearch = 1;
 264                         }
 265                 }
 266                 /* null terminate last domain if there are excess */
 267                 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
 268                         cp++;
 269                 *cp = '\0';
 270                 *pp++ = 0;
 271         }
 272
 273 #define MATCH(line, name) \
 274         (!strncmp(line, name, sizeof(name) - 1) && \
 275         (line[sizeof(name) - 1] == ' ' || \
 276          line[sizeof(name) - 1] == '\t'))
 277
 278         if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
 279             /* read the config file */
 280             while (fgets(buf, sizeof(buf), fp) != NULL) {
 281                 /* skip comments */
 282                 if (*buf == ';' || *buf == '#')
 283                         continue;
 284                 /* read default domain name */
 285                 if (MATCH(buf, "domain")) {
 286                     if (haveenv)        /* skip if have from environ */
 287                             continue;
 288                     cp = buf + sizeof("domain") - 1;
 289                     while (*cp == ' ' || *cp == '\t')
 290                             cp++;
 291                     if ((*cp == '\0') || (*cp == '\n'))
 292                             continue;
 293                     strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 294                     if ((cp = strpbrk(_res.defdname, " \t\n")) != NULL)
 295                             *cp = '\0';
 296                     havesearch = 0;
 297                     continue;
 298                 }
 299                 /* set search list */
 300                 if (MATCH(buf, "search")) {
 301                     if (haveenv)        /* skip if have from environ */
 302                             continue;
 303                     cp = buf + sizeof("search") - 1;
 304                     while (*cp == ' ' || *cp == '\t')
 305                             cp++;
 306                     if ((*cp == '\0') || (*cp == '\n'))
 307                             continue;
 308                     strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 309                     if ((cp = strchr(_res.defdname, '\n')) != NULL)
 310                             *cp = '\0';
 311                     /*
 312                      * Set search list to be blank-separated strings
 313                      * on rest of line.
 314                      */
 315                     cp = _res.defdname;
 316                     pp = _res.dnsrch;
 317                     *pp++ = cp;
 318                     for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
 319                             if (*cp == ' ' || *cp == '\t') {
 320                                     *cp = 0;
 321                                     n = 1;
 322                             } else if (n) {
 323                                     *pp++ = cp;
 324                                     n = 0;
 325                             }
 326                     }
 327                     /* null terminate last domain if there are excess */
 328                     while (*cp != '\0' && *cp != ' ' && *cp != '\t')
 329                             cp++;
 330                     *cp = '\0';
 331                     *pp++ = 0;
 332                     havesearch = 1;
 333                     continue;
 334                 }
 335                 /* read nameservers to query */
 336                 if (MATCH(buf, "nameserver") && nserv < MAXNS) {
 337                     struct in_addr a;
 338
 339                     cp = buf + sizeof("nameserver") - 1;
 340                     while (*cp == ' ' || *cp == '\t')
 341                         cp++;
 342                     if ((*cp != '\0') && (*cp != '\n') && inet_aton(cp, &a)) {
 343                         _res.nsaddr_list[nserv].sin_addr = a;
 344                         _res.nsaddr_list[nserv].sin_family = AF_INET;
 345                         _res.nsaddr_list[nserv].sin_port =
 346                                 htons(NAMESERVER_PORT);
 347                         nserv++;
 348                     }
 349                     continue;
 350                 }
 351 #ifdef RESOLVSORT
 352                 if (MATCH(buf, "sortlist")) {
 353                     struct in_addr a;
 354
 355                     cp = buf + sizeof("sortlist") - 1;
 356                     while (nsort < MAXRESOLVSORT) {
 357                         while (*cp == ' ' || *cp == '\t')
 358                             cp++;
 359                         if (*cp == '\0' || *cp == '\n' || *cp == ';')
 360                             break;
 361                         net = cp;
 362                         while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
 363                                isascii(*cp) && !isspace(*cp))
 364                                 cp++;
 365                         n = *cp;
 366                         *cp = 0;
 367                         if (inet_aton(net, &a)) {
 368                             _res.sort_list[nsort].addr = a;
 369                             if (ISSORTMASK(n)) {
 370                                 *cp++ = n;
 371                                 net = cp;
 372                                 while (*cp && *cp != ';' &&
 373                                         isascii(*cp) && !isspace(*cp))
 374                                     cp++;
 375                                 n = *cp;
 376                                 *cp = 0;
 377                                 if (inet_aton(net, &a)) {
 378                                     _res.sort_list[nsort].mask = a.s_addr;
 379                                 } else {
 380                                     _res.sort_list[nsort].mask =
 381                                         net_mask(_res.sort_list[nsort].addr);
 382                                 }
 383                             } else {
 384                                 _res.sort_list[nsort].mask =
 385                                     net_mask(_res.sort_list[nsort].addr);
 386                             }
 387                             nsort++;
 388                         }
 389                         *cp = n;
 390                     }
 391                     continue;
 392                 }
 393 #endif
 394                 if (MATCH(buf, "options")) {
 395                     res_setoptions(buf + sizeof("options") - 1, "conf");
 396                     continue;
 397                 }
 398             }
 399             if (nserv > 1)
 400                 _res.nscount = nserv;
 401 #ifdef RESOLVSORT
 402             _res.nsort = nsort;
 403 #endif
 404             (void) fclose(fp);
 405         }
 406 #if defined(__APPLE__) && defined(CONFIGURE_RESOLVER_FROM_NETINFO)
 407         else netinfo_res_init(&haveenv, &havesearch);
 408 #endif
 409
 410         if (_res.defdname[0] == 0 &&
 411             gethostname(buf, sizeof(_res.defdname) - 1) == 0 &&
 412             (cp = strchr(buf, '.')) != NULL)
 413                 strcpy(_res.defdname, cp + 1);
 414
 415         /* find components of local domain that might be searched */
 416         if (havesearch == 0) {
 417                 pp = _res.dnsrch;
 418                 *pp++ = _res.defdname;
 419                 *pp = NULL;
 420
 421 #ifndef RFC1535
 422                 dots = 0;
 423                 for (cp = _res.defdname; *cp; cp++)
 424                         dots += (*cp == '.');
 425
 426                 cp = _res.defdname;
 427                 while (pp < _res.dnsrch + MAXDFLSRCH) {
 428                         if (dots < LOCALDOMAINPARTS)
 429                                 break;
 430                         cp = strchr(cp, '.') + 1;    /* we know there is one */
 431                         *pp++ = cp;
 432                         dots--;
 433                 }
 434                 *pp = NULL;
 435 #ifdef DEBUG
 436                 if (_res.options & RES_DEBUG) {
 437                         printf(";; res_init()... default dnsrch list:\n");
 438                         for (pp = _res.dnsrch; *pp; pp++)
 439                                 printf(";;\t%s\n", *pp);
 440                         printf(";;\t..END..\n");
 441                 }
 442 #endif /* DEBUG */
 443 #endif /* !RFC1535 */
 444         }
 445
 446         if ((cp = getenv("RES_OPTIONS")) != NULL)
 447                 res_setoptions(cp, "env");
 448         _res.options |= RES_INIT;
 449         return (0);
 450 }
 451
 452 static void
 453 res_setoptions(options, source)
 454         char *options, *source;
 455 {
 456         char *cp = options;
 457         int i;
 458
 459 #ifdef DEBUG
 460         if (_res.options & RES_DEBUG)
 461                 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
 462                        options, source);
 463 #endif
 464         while (*cp) {
 465                 /* skip leading and inner runs of spaces */
 466                 while (*cp == ' ' || *cp == '\t')
 467                         cp++;
 468                 /* search for and process individual options */
 469                 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
 470                         i = atoi(cp + sizeof("ndots:") - 1);
 471                         if (i <= RES_MAXNDOTS)
 472                                 _res.ndots = i;
 473                         else
 474                                 _res.ndots = RES_MAXNDOTS;
 475 #ifdef DEBUG
 476                         if (_res.options & RES_DEBUG)
 477                                 printf(";;\tndots=%d\n", _res.ndots);
 478 #endif
 479                 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
 480 #ifdef DEBUG
 481                         if (!(_res.options & RES_DEBUG)) {
 482                                 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
 483                                        options, source);
 484                                 _res.options |= RES_DEBUG;
 485                         }
 486                         printf(";;\tdebug\n");
 487 #endif
 488                 } else {
 489                         /* XXX - print a warning here? */
 490                 }
 491                 /* skip to next run of spaces */
 492                 while (*cp && *cp != ' ' && *cp != '\t')
 493                         cp++;
 494         }
 495 }
 496
 497 #ifdef RESOLVSORT
 498 /* XXX - should really support CIDR which means explicit masks always. */
 499 static u_int32_t
 500 net_mask(in)            /* XXX - should really use system's version of this */
 501         struct in_addr in;
 502 {
 503         register u_int32_t i = ntohl(in.s_addr);
 504
 505         if (IN_CLASSA(i))
 506                 return (htonl(IN_CLASSA_NET));
 507         else if (IN_CLASSB(i))
 508                 return (htonl(IN_CLASSB_NET));
 509         return (htonl(IN_CLASSC_NET));
 510 }
 511 #endif
 512
 513 #if defined(__APPLE__) && defined(CONFIGURE_RESOLVER_FROM_NETINFO)
 514 static int
 515 netinfo_res_init(haveenv, havesearch)
 516         int *haveenv;
 517         int *havesearch;
 518 {
 519     register    int n;
 520     void        *domain, *parent;
 521     ni_id       dir;
 522     ni_status   status;
 523     ni_namelist nl;
 524     int         nserv = 0;
 525 #ifdef RESOLVSORT
 526     int         nsort = 0;
 527 #endif
 528
 529     status = ni_open(NULL, ".", &domain);
 530     if (status == NI_OK) {
 531         ni_setreadtimeout(domain, NI_TIMEOUT);
 532         ni_setabort(domain, 1);
 533
 534         /* climb the NetInfo hierarchy to find a resolver directory */
 535         while (status == NI_OK) {
 536             status = ni_pathsearch(domain, &dir, NI_PATH_RESCONF);
 537             if (status == NI_OK) {
 538             /* found a resolver directory */
 539
 540                 if (*haveenv == 0) {
 541                     /* get the default domain name */
 542                     status = ni_lookupprop(domain, &dir, "domain", &nl);
 543                     if (status == NI_OK && nl.ni_namelist_len > 0) {
 544                         (void)strncpy(_res.defdname,
 545                                       nl.ni_namelist_val[0],
 546                                       sizeof(_res.defdname) - 1);
 547                         _res.defdname[sizeof(_res.defdname) - 1] = '\0';
 548                         ni_namelist_free(&nl);
 549                         *havesearch = 0;
 550                     }
 551
 552                     /* get search list */
 553                     status = ni_lookupprop(domain, &dir, "search", &nl);
 554                     if (status == NI_OK && nl.ni_namelist_len > 0) {
 555                         (void)strncpy(_res.defdname,
 556                                       nl.ni_namelist_val[0],
 557                                       sizeof(_res.defdname) - 1);
 558                         _res.defdname[sizeof(_res.defdname) - 1] = '\0';
 559                         /* copy  */
 560                         for (n = 0;
 561                              n < nl.ni_namelist_len && n < MAXDNSRCH;
 562                              n++) {
 563                              /* duplicate up to MAXDNSRCH servers */
 564                              char *cp = nl.ni_namelist_val[n];
 565                             _res.dnsrch[n] =
 566                                 strcpy((char *)malloc(strlen(cp) + 1), cp);
 567                         }
 568                         ni_namelist_free(&nl);
 569                         *havesearch = 1;
 570                     }
 571                 }
 572
 573                 /* get list of nameservers */
 574                 status = ni_lookupprop(domain, &dir, "nameserver", &nl);
 575                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 576                     /* copy up to MAXNS servers */
 577                     for (n = 0;
 578                          n < nl.ni_namelist_len && nserv < MAXNS;
 579                          n++) {
 580                         struct in_addr a;
 581
 582                         if (inet_aton(nl.ni_namelist_val[n], &a)) {
 583                             _res.nsaddr_list[nserv].sin_addr = a;
 584                             _res.nsaddr_list[nserv].sin_family = AF_INET;
 585                             _res.nsaddr_list[nserv].sin_port =
 586                                 htons(NAMESERVER_PORT);
 587                             nserv++;
 588                         }
 589                     }
 590                     ni_namelist_free(&nl);
 591                 }
 592
 593                 if (nserv > 1)
 594                     _res.nscount = nserv;
 595
 596 #ifdef RESOLVSORT
 597                 /* get sort order */
 598                 status = ni_lookupprop(domain, &dir, "sortlist", &nl);
 599                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 600
 601                     /* copy up to MAXRESOLVSORT address/netmask pairs */
 602                     for (n = 0;
 603                          n < nl.ni_namelist_len && nsort < MAXRESOLVSORT;
 604                          n++) {
 605                         char ch = '\0';
 606                         char *cp;
 607                         const char *sp;
 608                         struct in_addr a;
 609
 610                         cp = NULL;
 611                         for (sp = sort_mask; *sp; sp++) {
 612                                 char *cp1;
 613                                 cp1 = strchr(nl.ni_namelist_val[n], *sp);
 614                                 if (cp && cp1)
 615                                         cp = (cp < cp1)? cp : cp1;
 616                                 else if (cp1)
 617                                         cp = cp1;
 618                         }
 619                         if (cp != NULL) {
 620                                 ch = *cp;
 621                                 *cp = '\0';
 622                                 break;
 623                         }
 624                         if (inet_aton(nl.ni_namelist_val[n], &a)) {
 625                             _res.sort_list[nsort].addr = a;
 626                             if (*cp && ISSORTMASK(ch)) {
 627                                 *cp++ = ch;
 628                                 if (inet_aton(cp, &a)) {
 629                                     _res.sort_list[nsort].mask = a.s_addr;
 630                                 } else {
 631                                     _res.sort_list[nsort].mask =
 632                                         net_mask(_res.sort_list[nsort].addr);
 633                                 }
 634                             } else {
 635                                 _res.sort_list[nsort].mask =
 636                                     net_mask(_res.sort_list[nsort].addr);
 637                             }
 638                             nsort++;
 639                         }
 640                     }
 641                     ni_namelist_free(&nl);
 642                 }
 643
 644                 _res.nsort = nsort;
 645 #endif
 646
 647                 /* get resolver options */
 648                 status = ni_lookupprop(domain, &dir, "options", &nl);
 649                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 650                     res_setoptions(nl.ni_namelist_val[0], "conf");
 651                     ni_namelist_free(&nl);
 652                 }
 653
 654                 ni_free(domain);
 655                 return(1);      /* using DNS configuration from NetInfo */
 656             }
 657
 658             status = ni_open(domain, "..", &parent);
 659             ni_free(domain);
 660             if (status == NI_OK)
 661                 domain = parent;
 662         }
 663     }
 664     return(0);  /* if not using DNS configuration from NetInfo */
 665 }
 666 #endif  /* __APPLE__ */
 667
 668 u_int16_t
 669 res_randomid()
 670 {
 671         struct timeval now;
 672
 673         gettimeofday(&now, NULL);
 674         return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
 675 }