resolv/res_init.c

   1 /*
   2  * ++Copyright++ 1985, 1989, 1993
   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  * 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  * --Copyright--
  54  */
  55
  56 #if defined(LIBC_SCCS) && !defined(lint)
  57 static char sccsid[] = "@(#)res_init.c  8.1 (Berkeley) 6/7/93";
  58 static char rcsid[] = "$Id$";
  59 #endif /* LIBC_SCCS and not lint */
  60
  61 #include <sys/param.h>
  62 #include <sys/socket.h>
  63 #include <netinet/in.h>
  64 #include <arpa/inet.h>
  65 #include <arpa/nameser.h>
  66
  67 #include <stdio.h>
  68 #include <ctype.h>
  69 #include <resolv.h>
  70 #if defined(BSD) && (BSD >= 199103)
  71 # include <unistd.h>
  72 # include <stdlib.h>
  73 # include <string.h>
  74 #else
  75 # include "../conf/portability.h"
  76 #endif
  77
  78 /*
  79  * Marc Majka           1994/04/16
  80  * Allan Nathanson      1994/10/29 (BIND 4.9.3.x)
  81  *
  82  * NetInfo resolver configuration directory support.
  83  *
  84  * Allow a NetInfo directory to be created in the hierarchy which
  85  * contains the same information as the resolver configuration file.
  86  *
  87  * - The local domain name is stored as the value of the "domain" property.
  88  * - The Internet address(es) of the name server(s) are stored as values
  89  *   of the "nameserver" property.
  90  * - The name server addresses are stored as values of the "nameserver"
  91  *   property.
  92  * - The search list for host-name lookup is stored as values of the
  93  *   "search" property.
  94  * - The sortlist comprised of IP address netmask pairs are stored as
  95  *   values of the "sortlist" property. The IP address and optional netmask
  96  *   should be seperated by a slash (/) character.
  97  * - Internal resolver variables can be set from the value of the "options"
  98  *   property.
  99  *
 100  */
 101 #if defined(NeXT)
 102 #  include <netinfo/ni.h>
 103 #  define NI_PATH_RESCONF "/locations/resolver"
 104 #  define NI_TIMEOUT 10
 105 static int netinfo_res_init __P((int *haveenv, int *havesearch));
 106 #endif
 107
 108 #if defined(USE_OPTIONS_H)
 109 # include "../conf/options.h"
 110 #endif
 111
 112 static void res_setoptions __P((char *, char *));
 113
 114 #ifdef RESOLVSORT
 115 static u_int32_t net_mask __P((struct in_addr));
 116 #endif
 117
 118 #if !defined(isascii)   /* XXX - could be a function */
 119 # define isascii(c) (!(c & 0200))
 120 #endif
 121
 122 /*
 123  * Resolver state default settings.
 124  */
 125
 126 struct __res_state _res;
 127
 128 /*
 129  * Set up default settings.  If the configuration file exist, the values
 130  * there will have precedence.  Otherwise, the server address is set to
 131  * INADDR_ANY and the default domain name comes from the gethostname().
 132  *
 133  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
 134  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
 135  * since it was noted that INADDR_ANY actually meant ``the first interface
 136  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
 137  * it had to be "up" in order for you to reach your own name server.  It
 138  * was later decided that since the recommended practice is to always
 139  * install local static routes through 127.0.0.1 for all your network
 140  * interfaces, that we could solve this problem without a code change.
 141  *
 142  * The configuration file should always be used, since it is the only way
 143  * to specify a default domain.  If you are running a server on your local
 144  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
 145  * in the configuration file.
 146  *
 147  * Return 0 if completes successfully, -1 on error
 148  */
 149 res_init()
 150 {
 151         register FILE *fp;
 152         register char *cp, **pp;
 153         register int n, dots;
 154         char buf[BUFSIZ];
 155         int nserv = 0;    /* number of nameserver records read from file */
 156         int haveenv = 0;
 157         int havesearch = 0;
 158 #ifdef RESOLVSORT
 159         int nsort = 0;
 160         char *net;
 161 #endif
 162
 163         /*
 164          * These three fields used to be statically initialized.  This made
 165          * it hard to use this code in a shared library.  It is necessary,
 166          * now that we're doing dynamic initialization here, that we preserve
 167          * the old semantics: if an application modifies one of these three
 168          * fields of _res before res_init() is called, res_init() will not
 169          * alter them.  Of course, if an application is setting them to
 170          * _zero_ before calling res_init(), hoping to override what used
 171          * to be the static default, we can't detect it and unexpected results
 172          * will follow.  Zero for any of these fields would make no sense,
 173          * so one can safely assume that the applications were already getting
 174          * unexpected results.
 175          */
 176         if (!_res.retrans)
 177                 _res.retrans = RES_TIMEOUT;
 178         if (!_res.retry)
 179                 _res.retry = 4;
 180         if (!_res.options)
 181                 _res.options = RES_DEFAULT;
 182
 183 #ifdef USELOOPBACK
 184         _res.nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
 185 #else
 186         _res.nsaddr.sin_addr.s_addr = INADDR_ANY;
 187 #endif
 188         _res.nsaddr.sin_family = AF_INET;
 189         _res.nsaddr.sin_port = htons(NAMESERVER_PORT);
 190         _res.nscount = 1;
 191         _res.ndots = 1;
 192         _res.pfcode = 0;
 193
 194         /* Allow user to override the local domain definition */
 195         if ((cp = getenv("LOCALDOMAIN")) != NULL) {
 196                 (void)strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 197                 haveenv++;
 198
 199                 /*
 200                  * Set search list to be blank-separated strings
 201                  * from rest of env value.  Permits users of LOCALDOMAIN
 202                  * to still have a search list, and anyone to set the
 203                  * one that they want to use as an individual (even more
 204                  * important now that the rfc1535 stuff restricts searches)
 205                  */
 206                 cp = _res.defdname;
 207                 pp = _res.dnsrch;
 208                 *pp++ = cp;
 209                 for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
 210                         if (*cp == '\n')        /* silly backwards compat */
 211                                 break;
 212                         else if (*cp == ' ' || *cp == '\t') {
 213                                 *cp = 0;
 214                                 n = 1;
 215                         } else if (n) {
 216                                 *pp++ = cp;
 217                                 n = 0;
 218                                 havesearch = 1;
 219                         }
 220                 }
 221                 /* null terminate last domain if there are excess */
 222                 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
 223                         cp++;
 224                 *cp = '\0';
 225                 *pp++ = 0;
 226         }
 227
 228 #define MATCH(line, name) \
 229         (!strncmp(line, name, sizeof(name) - 1) && \
 230         (line[sizeof(name) - 1] == ' ' || \
 231          line[sizeof(name) - 1] == '\t'))
 232
 233 #ifdef  NeXT
 234         if (netinfo_res_init(&haveenv, &havesearch) == 0)
 235 #endif
 236         if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
 237             /* read the config file */
 238             while (fgets(buf, sizeof(buf), fp) != NULL) {
 239                 /* skip comments */
 240                 if (*buf == ';' || *buf == '#')
 241                         continue;
 242                 /* read default domain name */
 243                 if (MATCH(buf, "domain")) {
 244                     if (haveenv)        /* skip if have from environ */
 245                             continue;
 246                     cp = buf + sizeof("domain") - 1;
 247                     while (*cp == ' ' || *cp == '\t')
 248                             cp++;
 249                     if ((*cp == '\0') || (*cp == '\n'))
 250                             continue;
 251                     strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 252                     if ((cp = strpbrk(_res.defdname, " \t\n")) != NULL)
 253                             *cp = '\0';
 254                     havesearch = 0;
 255                     continue;
 256                 }
 257                 /* set search list */
 258                 if (MATCH(buf, "search")) {
 259                     if (haveenv)        /* skip if have from environ */
 260                             continue;
 261                     cp = buf + sizeof("search") - 1;
 262                     while (*cp == ' ' || *cp == '\t')
 263                             cp++;
 264                     if ((*cp == '\0') || (*cp == '\n'))
 265                             continue;
 266                     strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 267                     if ((cp = strchr(_res.defdname, '\n')) != NULL)
 268                             *cp = '\0';
 269                     /*
 270                      * Set search list to be blank-separated strings
 271                      * on rest of line.
 272                      */
 273                     cp = _res.defdname;
 274                     pp = _res.dnsrch;
 275                     *pp++ = cp;
 276                     for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
 277                             if (*cp == ' ' || *cp == '\t') {
 278                                     *cp = 0;
 279                                     n = 1;
 280                             } else if (n) {
 281                                     *pp++ = cp;
 282                                     n = 0;
 283                             }
 284                     }
 285                     /* null terminate last domain if there are excess */
 286                     while (*cp != '\0' && *cp != ' ' && *cp != '\t')
 287                             cp++;
 288                     *cp = '\0';
 289                     *pp++ = 0;
 290                     havesearch = 1;
 291                     continue;
 292                 }
 293                 /* read nameservers to query */
 294                 if (MATCH(buf, "nameserver") && nserv < MAXNS) {
 295                     struct in_addr a;
 296
 297                     cp = buf + sizeof("nameserver") - 1;
 298                     while (*cp == ' ' || *cp == '\t')
 299                         cp++;
 300                     if ((*cp != '\0') && (*cp != '\n') && inet_aton(cp, &a)) {
 301                         _res.nsaddr_list[nserv].sin_addr = a;
 302                         _res.nsaddr_list[nserv].sin_family = AF_INET;
 303                         _res.nsaddr_list[nserv].sin_port =
 304                                 htons(NAMESERVER_PORT);
 305                         nserv++;
 306                     }
 307                     continue;
 308                 }
 309 #ifdef RESOLVSORT
 310                 if (MATCH(buf, "sortlist")) {
 311                     struct in_addr a;
 312
 313                     cp = buf + sizeof("sortlist") - 1;
 314                     while (nsort < MAXRESOLVSORT) {
 315                         while (*cp == ' ' || *cp == '\t')
 316                             cp++;
 317                         if (*cp == '\0' || *cp == '\n' || *cp == ';')
 318                             break;
 319                         net = cp;
 320                         while (*cp && *cp != '/' &&
 321                                isascii(*cp) && !isspace(*cp))
 322                                 cp++;
 323                         n = *cp;
 324                         *cp = 0;
 325                         if (inet_aton(net, &a)) {
 326                             _res.sort_list[nsort].addr = a;
 327                             if (n == '/') {
 328                                 *cp++ = n;
 329                                 net = cp;
 330                                 while (*cp && isascii(*cp) && !isspace(*cp))
 331                                     cp++;
 332                                 n = *cp;
 333                                 *cp = 0;
 334                                 if (inet_aton(net, &a)) {
 335                                     _res.sort_list[nsort].mask = a.s_addr;
 336                                 } else {
 337                                     _res.sort_list[nsort].mask =
 338                                         net_mask(_res.sort_list[nsort].addr);
 339                                 }
 340                             } else {
 341                                 _res.sort_list[nsort].mask =
 342                                     net_mask(_res.sort_list[nsort].addr);
 343                             }
 344                             nsort++;
 345                         }
 346                         *cp++ = n;
 347                     }
 348                     continue;
 349                 }
 350 #endif
 351                 if (MATCH(buf, "options")) {
 352                     res_setoptions(buf + sizeof("options") - 1, "conf");
 353                     continue;
 354                 }
 355             }
 356             if (nserv > 1)
 357                 _res.nscount = nserv;
 358 #ifdef RESOLVSORT
 359             _res.nsort = nsort;
 360 #endif
 361             (void) fclose(fp);
 362         }
 363         if (_res.defdname[0] == 0 &&
 364             gethostname(buf, sizeof(_res.defdname) - 1) == 0 &&
 365             (cp = strchr(buf, '.')) != NULL)
 366                 strcpy(_res.defdname, cp + 1);
 367
 368         /* find components of local domain that might be searched */
 369         if (havesearch == 0) {
 370                 pp = _res.dnsrch;
 371                 *pp++ = _res.defdname;
 372                 *pp = NULL;
 373
 374 #ifndef RFC1535
 375                 dots = 0;
 376                 for (cp = _res.defdname; *cp; cp++)
 377                         dots += (*cp == '.');
 378
 379                 cp = _res.defdname;
 380                 while (pp < _res.dnsrch + MAXDFLSRCH) {
 381                         if (dots < LOCALDOMAINPARTS)
 382                                 break;
 383                         cp = strchr(cp, '.') + 1;    /* we know there is one */
 384                         *pp++ = cp;
 385                         dots--;
 386                 }
 387                 *pp = NULL;
 388 #ifdef DEBUG
 389                 if (_res.options & RES_DEBUG) {
 390                         printf(";; res_init()... default dnsrch list:\n");
 391                         for (pp = _res.dnsrch; *pp; pp++)
 392                                 printf(";;\t%s\n", *pp);
 393                         printf(";;\t..END..\n");
 394                 }
 395 #endif /* DEBUG */
 396 #endif /* !RFC1535 */
 397         }
 398
 399         if ((cp = getenv("RES_OPTIONS")) != NULL)
 400                 res_setoptions(cp, "env");
 401         _res.options |= RES_INIT;
 402         return (0);
 403 }
 404
 405 static void
 406 res_setoptions(options, source)
 407         char *options, *source;
 408 {
 409         char *cp = options;
 410         int i;
 411
 412 #ifdef DEBUG
 413         if (_res.options & RES_DEBUG)
 414                 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
 415                        options, source);
 416 #endif
 417         while (*cp) {
 418                 /* skip leading and inner runs of spaces */
 419                 while (*cp == ' ' || *cp == '\t')
 420                         cp++;
 421                 /* search for and process individual options */
 422                 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
 423                         i = atoi(cp + sizeof("ndots:") - 1);
 424                         if (i <= RES_MAXNDOTS)
 425                                 _res.ndots = i;
 426                         else
 427                                 _res.ndots = RES_MAXNDOTS;
 428 #ifdef DEBUG
 429                         if (_res.options & RES_DEBUG)
 430                                 printf(";;\tndots=%d\n", _res.ndots);
 431 #endif
 432                 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
 433 #ifdef DEBUG
 434                         if (!(_res.options & RES_DEBUG)) {
 435                                 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
 436                                        options, source);
 437                                 _res.options |= RES_DEBUG;
 438                         }
 439                         printf(";;\tdebug\n");
 440 #endif
 441                 } else {
 442                         /* XXX - print a warning here? */
 443                 }
 444                 /* skip to next run of spaces */
 445                 while (*cp && *cp != ' ' && *cp != '\t')
 446                         cp++;
 447         }
 448 }
 449
 450 #ifdef RESOLVSORT
 451 static u_int32_t
 452 net_mask(in)            /* XXX - should really use system's version of this */
 453         struct in_addr in;
 454 {
 455         register u_int32_t i = ntohl(in.s_addr);
 456
 457         if (IN_CLASSA(i))
 458                 return (htonl(IN_CLASSA_NET));
 459         else if (IN_CLASSB(i))
 460                 return (htonl(IN_CLASSB_NET));
 461         return (htonl(IN_CLASSC_NET));
 462 }
 463 #endif
 464
 465 #ifdef  NeXT
 466 static int
 467 netinfo_res_init(haveenv, havesearch)
 468         int *haveenv;
 469         int *havesearch;
 470 {
 471     register    int n;
 472     void        *domain, *parent;
 473     ni_id       dir;
 474     ni_status   status;
 475     ni_namelist nl;
 476     int         nserv = 0;
 477 #ifdef RESOLVSORT
 478     int         nsort = 0;
 479 #endif
 480
 481     status = ni_open(NULL, ".", &domain);
 482     if (status == NI_OK) {
 483         ni_setreadtimeout(domain, NI_TIMEOUT);
 484         ni_setabort(domain, 1);
 485
 486         /* climb the NetInfo hierarchy to find a resolver directory */
 487         while (status == NI_OK) {
 488             status = ni_pathsearch(domain, &dir, NI_PATH_RESCONF);
 489             if (status == NI_OK) {
 490             /* found a resolver directory */
 491
 492                 if (*haveenv == 0) {
 493                     /* get the default domain name */
 494                     status = ni_lookupprop(domain, &dir, "domain", &nl);
 495                     if (status == NI_OK && nl.ni_namelist_len > 0) {
 496                         (void)strncpy(_res.defdname,
 497                                       nl.ni_namelist_val[0],
 498                                       sizeof(_res.defdname) - 1);
 499                         _res.defdname[sizeof(_res.defdname) - 1] = '\0';
 500                         ni_namelist_free(&nl);
 501                         *havesearch = 0;
 502                     }
 503
 504                     /* get search list */
 505                     status = ni_lookupprop(domain, &dir, "search", &nl);
 506                     if (status == NI_OK && nl.ni_namelist_len > 0) {
 507                         (void)strncpy(_res.defdname,
 508                                       nl.ni_namelist_val[0],
 509                                       sizeof(_res.defdname) - 1);
 510                         _res.defdname[sizeof(_res.defdname) - 1] = '\0';
 511                         /* copy  */
 512                         for (n = 0;
 513                              n < nl.ni_namelist_len && n < MAXDNSRCH;
 514                              n++) {
 515                              /* duplicate up to MAXDNSRCH servers */
 516                              char *cp = nl.ni_namelist_val[n];
 517                             _res.dnsrch[n] =
 518                                 strcpy((char *)malloc(strlen(cp) + 1), cp);
 519                         }
 520                         ni_namelist_free(&nl);
 521                         *havesearch = 1;
 522                     }
 523                 }
 524
 525                 /* get list of nameservers */
 526                 status = ni_lookupprop(domain, &dir, "nameserver", &nl);
 527                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 528                     /* copy up to MAXNS servers */
 529                     for (n = 0;
 530                          n < nl.ni_namelist_len && nserv < MAXNS;
 531                          n++) {
 532                         struct in_addr a;
 533
 534                         if (inet_aton(nl.ni_namelist_val[n], &a)) {
 535                             _res.nsaddr_list[nserv].sin_addr = a;
 536                             _res.nsaddr_list[nserv].sin_family = AF_INET;
 537                             _res.nsaddr_list[nserv].sin_port =
 538                                 htons(NAMESERVER_PORT);
 539                             nserv++;
 540                         }
 541                     }
 542                     ni_namelist_free(&nl);
 543                 }
 544
 545                 if (nserv > 1)
 546                     _res.nscount = nserv;
 547
 548 #ifdef RESOLVSORT
 549                 /* get sort order */
 550                 status = ni_lookupprop(domain, &dir, "sortlist", &nl);
 551                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 552
 553                     /* copy up to MAXRESOLVSORT address/netmask pairs */
 554                     for (n = 0;
 555                          n < nl.ni_namelist_len && nsort < MAXRESOLVSORT;
 556                          n++) {
 557                         char ch;
 558                         char *cp;
 559                         struct in_addr a;
 560
 561                         cp = strchr(nl.ni_namelist_val[n], '/');
 562                         if (cp != NULL) {
 563                             ch = *cp;
 564                             *cp = '\0';
 565                         }
 566
 567                         if (inet_aton(nl.ni_namelist_val[n], &a)) {
 568                             _res.sort_list[nsort].addr = a;
 569                             if (*cp && ch == '/') {
 570                                 *cp++ = ch;
 571                                 if (inet_aton(cp, &a)) {
 572                                     _res.sort_list[nsort].mask = a.s_addr;
 573                                 } else {
 574                                     _res.sort_list[nsort].mask =
 575                                         net_mask(_res.sort_list[nsort].addr);
 576                                 }
 577                             } else {
 578                                 _res.sort_list[nsort].mask =
 579                                     net_mask(_res.sort_list[nsort].addr);
 580                             }
 581                             nsort++;
 582                         }
 583                     }
 584                     ni_namelist_free(&nl);
 585                 }
 586
 587                 _res.nsort = nsort;
 588 #endif
 589
 590                 /* get resolver options */
 591                 status = ni_lookupprop(domain, &dir, "options", &nl);
 592                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 593                     res_setoptions(nl.ni_namelist_val[0], "conf");
 594                     ni_namelist_free(&nl);
 595                 }
 596
 597                 ni_free(domain);
 598                 return(1);      /* using DNS configuration from NetInfo */
 599             }
 600
 601             status = ni_open(domain, "..", &parent);
 602             ni_free(domain);
 603             if (status == NI_OK)
 604                 domain = parent;
 605         }
 606     }
 607     return(0);  /* if not using DNS configuration from NetInfo */
 608 }
 609 #endif  /* NeXT */