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 <sys/time.h>
  64 #include <netinet/in.h>
  65 #include <arpa/inet.h>
  66 #include <arpa/nameser.h>
  67
  68 #include <stdio.h>
  69 #include <ctype.h>
  70 #include <resolv.h>
  71 #if defined(BSD) && (BSD >= 199103)
  72 # include <unistd.h>
  73 # include <stdlib.h>
  74 # include <string.h>
  75 #else
  76 # include "../conf/portability.h"
  77 #endif
  78
  79 /*-------------------------------------- info about "sortlist" --------------
  80  * Marc Majka           1994/04/16
  81  * Allan Nathanson      1994/10/29 (BIND 4.9.3.x)
  82  *
  83  * NetInfo resolver configuration directory support.
  84  *
  85  * Allow a NetInfo directory to be created in the hierarchy which
  86  * contains the same information as the resolver configuration file.
  87  *
  88  * - The local domain name is stored as the value of the "domain" property.
  89  * - The Internet address(es) of the name server(s) are stored as values
  90  *   of the "nameserver" property.
  91  * - The name server addresses are stored as values of the "nameserver"
  92  *   property.
  93  * - The search list for host-name lookup is stored as values of the
  94  *   "search" property.
  95  * - The sortlist comprised of IP address netmask pairs are stored as
  96  *   values of the "sortlist" property. The IP address and optional netmask
  97  *   should be seperated by a slash (/) or ampersand (&) character.
  98  * - Internal resolver variables can be set from the value of the "options"
  99  *   property.
 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 const char sort_mask[] = "/&";
 116 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
 117 static u_int32_t net_mask __P((struct in_addr));
 118 #endif
 119
 120 #if !defined(isascii)   /* XXX - could be a function */
 121 # define isascii(c) (!(c & 0200))
 122 #endif
 123
 124 /*
 125  * Resolver state default settings.
 126  */
 127
 128 struct __res_state _res;
 129
 130 /*
 131  * Set up default settings.  If the configuration file exist, the values
 132  * there will have precedence.  Otherwise, the server address is set to
 133  * INADDR_ANY and the default domain name comes from the gethostname().
 134  *
 135  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
 136  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
 137  * since it was noted that INADDR_ANY actually meant ``the first interface
 138  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
 139  * it had to be "up" in order for you to reach your own name server.  It
 140  * was later decided that since the recommended practice is to always
 141  * install local static routes through 127.0.0.1 for all your network
 142  * interfaces, that we could solve this problem without a code change.
 143  *
 144  * The configuration file should always be used, since it is the only way
 145  * to specify a default domain.  If you are running a server on your local
 146  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
 147  * in the configuration file.
 148  *
 149  * Return 0 if completes successfully, -1 on error
 150  */
 151 int
 152 res_init()
 153 {
 154         register FILE *fp;
 155         register char *cp, **pp;
 156         register int n;
 157         char buf[BUFSIZ];
 158         int nserv = 0;    /* number of nameserver records read from file */
 159         int haveenv = 0;
 160         int havesearch = 0;
 161 #ifdef RESOLVSORT
 162         int nsort = 0;
 163         char *net;
 164 #endif
 165 #ifndef RFC1535
 166         int dots;
 167 #endif
 168
 169         /*
 170          * These three fields used to be statically initialized.  This made
 171          * it hard to use this code in a shared library.  It is necessary,
 172          * now that we're doing dynamic initialization here, that we preserve
 173          * the old semantics: if an application modifies one of these three
 174          * fields of _res before res_init() is called, res_init() will not
 175          * alter them.  Of course, if an application is setting them to
 176          * _zero_ before calling res_init(), hoping to override what used
 177          * to be the static default, we can't detect it and unexpected results
 178          * will follow.  Zero for any of these fields would make no sense,
 179          * so one can safely assume that the applications were already getting
 180          * unexpected results.
 181          *
 182          * _res.options is tricky since some apps were known to diddle the bits
 183          * before res_init() was first called. We can't replicate that semantic
 184          * with dynamic initialization (they may have turned bits off that are
 185          * set in RES_DEFAULT).  Our solution is to declare such applications
 186          * "broken".  They could fool us by setting RES_INIT but none do (yet).
 187          */
 188         if (!_res.retrans)
 189                 _res.retrans = RES_TIMEOUT;
 190         if (!_res.retry)
 191                 _res.retry = 4;
 192         if (!(_res.options & RES_INIT))
 193                 _res.options = RES_DEFAULT;
 194
 195         /*
 196          * This one used to initialize implicitly to zero, so unless the app
 197          * has set it to something in particular, we can randomize it now.
 198          */
 199         if (!_res.id)
 200                 _res.id = res_randomid();
 201
 202 #ifdef USELOOPBACK
 203         _res.nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
 204 #else
 205         _res.nsaddr.sin_addr.s_addr = INADDR_ANY;
 206 #endif
 207         _res.nsaddr.sin_family = AF_INET;
 208         _res.nsaddr.sin_port = htons(NAMESERVER_PORT);
 209         _res.nscount = 1;
 210         _res.ndots = 1;
 211         _res.pfcode = 0;
 212
 213         /* Allow user to override the local domain definition */
 214         if ((cp = getenv("LOCALDOMAIN")) != NULL) {
 215                 (void)strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 216                 haveenv++;
 217
 218                 /*
 219                  * Set search list to be blank-separated strings
 220                  * from rest of env value.  Permits users of LOCALDOMAIN
 221                  * to still have a search list, and anyone to set the
 222                  * one that they want to use as an individual (even more
 223                  * important now that the rfc1535 stuff restricts searches)
 224                  */
 225                 cp = _res.defdname;
 226                 pp = _res.dnsrch;
 227                 *pp++ = cp;
 228                 for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
 229                         if (*cp == '\n')        /* silly backwards compat */
 230                                 break;
 231                         else if (*cp == ' ' || *cp == '\t') {
 232                                 *cp = 0;
 233                                 n = 1;
 234                         } else if (n) {
 235                                 *pp++ = cp;
 236                                 n = 0;
 237                                 havesearch = 1;
 238                         }
 239                 }
 240                 /* null terminate last domain if there are excess */
 241                 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
 242                         cp++;
 243                 *cp = '\0';
 244                 *pp++ = 0;
 245         }
 246
 247 #define MATCH(line, name) \
 248         (!strncmp(line, name, sizeof(name) - 1) && \
 249         (line[sizeof(name) - 1] == ' ' || \
 250          line[sizeof(name) - 1] == '\t'))
 251
 252 #ifdef  NeXT
 253         if (netinfo_res_init(&haveenv, &havesearch) == 0)
 254 #endif
 255         if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
 256             /* read the config file */
 257             while (fgets(buf, sizeof(buf), fp) != NULL) {
 258                 /* skip comments */
 259                 if (*buf == ';' || *buf == '#')
 260                         continue;
 261                 /* read default domain name */
 262                 if (MATCH(buf, "domain")) {
 263                     if (haveenv)        /* skip if have from environ */
 264                             continue;
 265                     cp = buf + sizeof("domain") - 1;
 266                     while (*cp == ' ' || *cp == '\t')
 267                             cp++;
 268                     if ((*cp == '\0') || (*cp == '\n'))
 269                             continue;
 270                     strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 271                     if ((cp = strpbrk(_res.defdname, " \t\n")) != NULL)
 272                             *cp = '\0';
 273                     havesearch = 0;
 274                     continue;
 275                 }
 276                 /* set search list */
 277                 if (MATCH(buf, "search")) {
 278                     if (haveenv)        /* skip if have from environ */
 279                             continue;
 280                     cp = buf + sizeof("search") - 1;
 281                     while (*cp == ' ' || *cp == '\t')
 282                             cp++;
 283                     if ((*cp == '\0') || (*cp == '\n'))
 284                             continue;
 285                     strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 286                     if ((cp = strchr(_res.defdname, '\n')) != NULL)
 287                             *cp = '\0';
 288                     /*
 289                      * Set search list to be blank-separated strings
 290                      * on rest of line.
 291                      */
 292                     cp = _res.defdname;
 293                     pp = _res.dnsrch;
 294                     *pp++ = cp;
 295                     for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
 296                             if (*cp == ' ' || *cp == '\t') {
 297                                     *cp = 0;
 298                                     n = 1;
 299                             } else if (n) {
 300                                     *pp++ = cp;
 301                                     n = 0;
 302                             }
 303                     }
 304                     /* null terminate last domain if there are excess */
 305                     while (*cp != '\0' && *cp != ' ' && *cp != '\t')
 306                             cp++;
 307                     *cp = '\0';
 308                     *pp++ = 0;
 309                     havesearch = 1;
 310                     continue;
 311                 }
 312                 /* read nameservers to query */
 313                 if (MATCH(buf, "nameserver") && nserv < MAXNS) {
 314                     struct in_addr a;
 315
 316                     cp = buf + sizeof("nameserver") - 1;
 317                     while (*cp == ' ' || *cp == '\t')
 318                         cp++;
 319                     if ((*cp != '\0') && (*cp != '\n') && inet_aton(cp, &a)) {
 320                         _res.nsaddr_list[nserv].sin_addr = a;
 321                         _res.nsaddr_list[nserv].sin_family = AF_INET;
 322                         _res.nsaddr_list[nserv].sin_port =
 323                                 htons(NAMESERVER_PORT);
 324                         nserv++;
 325                     }
 326                     continue;
 327                 }
 328 #ifdef RESOLVSORT
 329                 if (MATCH(buf, "sortlist")) {
 330                     struct in_addr a;
 331
 332                     cp = buf + sizeof("sortlist") - 1;
 333                     while (nsort < MAXRESOLVSORT) {
 334                         while (*cp == ' ' || *cp == '\t')
 335                             cp++;
 336                         if (*cp == '\0' || *cp == '\n' || *cp == ';')
 337                             break;
 338                         net = cp;
 339                         while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
 340                                isascii(*cp) && !isspace(*cp))
 341                                 cp++;
 342                         n = *cp;
 343                         *cp = 0;
 344                         if (inet_aton(net, &a)) {
 345                             _res.sort_list[nsort].addr = a;
 346                             if (ISSORTMASK(n)) {
 347                                 *cp++ = n;
 348                                 net = cp;
 349                                 while (*cp && *cp != ';' &&
 350                                         isascii(*cp) && !isspace(*cp))
 351                                     cp++;
 352                                 n = *cp;
 353                                 *cp = 0;
 354                                 if (inet_aton(net, &a)) {
 355                                     _res.sort_list[nsort].mask = a.s_addr;
 356                                 } else {
 357                                     _res.sort_list[nsort].mask =
 358                                         net_mask(_res.sort_list[nsort].addr);
 359                                 }
 360                             } else {
 361                                 _res.sort_list[nsort].mask =
 362                                     net_mask(_res.sort_list[nsort].addr);
 363                             }
 364                             nsort++;
 365                         }
 366                         *cp = n;
 367                     }
 368                     continue;
 369                 }
 370 #endif
 371                 if (MATCH(buf, "options")) {
 372                     res_setoptions(buf + sizeof("options") - 1, "conf");
 373                     continue;
 374                 }
 375             }
 376             if (nserv > 1)
 377                 _res.nscount = nserv;
 378 #ifdef RESOLVSORT
 379             _res.nsort = nsort;
 380 #endif
 381             (void) fclose(fp);
 382         }
 383         if (_res.defdname[0] == 0 &&
 384             gethostname(buf, sizeof(_res.defdname) - 1) == 0 &&
 385             (cp = strchr(buf, '.')) != NULL)
 386                 strcpy(_res.defdname, cp + 1);
 387
 388         /* find components of local domain that might be searched */
 389         if (havesearch == 0) {
 390                 pp = _res.dnsrch;
 391                 *pp++ = _res.defdname;
 392                 *pp = NULL;
 393
 394 #ifndef RFC1535
 395                 dots = 0;
 396                 for (cp = _res.defdname; *cp; cp++)
 397                         dots += (*cp == '.');
 398
 399                 cp = _res.defdname;
 400                 while (pp < _res.dnsrch + MAXDFLSRCH) {
 401                         if (dots < LOCALDOMAINPARTS)
 402                                 break;
 403                         cp = strchr(cp, '.') + 1;    /* we know there is one */
 404                         *pp++ = cp;
 405                         dots--;
 406                 }
 407                 *pp = NULL;
 408 #ifdef DEBUG
 409                 if (_res.options & RES_DEBUG) {
 410                         printf(";; res_init()... default dnsrch list:\n");
 411                         for (pp = _res.dnsrch; *pp; pp++)
 412                                 printf(";;\t%s\n", *pp);
 413                         printf(";;\t..END..\n");
 414                 }
 415 #endif /* DEBUG */
 416 #endif /* !RFC1535 */
 417         }
 418
 419         if ((cp = getenv("RES_OPTIONS")) != NULL)
 420                 res_setoptions(cp, "env");
 421         _res.options |= RES_INIT;
 422         return (0);
 423 }
 424
 425 static void
 426 res_setoptions(options, source)
 427         char *options, *source;
 428 {
 429         char *cp = options;
 430         int i;
 431
 432 #ifdef DEBUG
 433         if (_res.options & RES_DEBUG)
 434                 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
 435                        options, source);
 436 #endif
 437         while (*cp) {
 438                 /* skip leading and inner runs of spaces */
 439                 while (*cp == ' ' || *cp == '\t')
 440                         cp++;
 441                 /* search for and process individual options */
 442                 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
 443                         i = atoi(cp + sizeof("ndots:") - 1);
 444                         if (i <= RES_MAXNDOTS)
 445                                 _res.ndots = i;
 446                         else
 447                                 _res.ndots = RES_MAXNDOTS;
 448 #ifdef DEBUG
 449                         if (_res.options & RES_DEBUG)
 450                                 printf(";;\tndots=%d\n", _res.ndots);
 451 #endif
 452                 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
 453 #ifdef DEBUG
 454                         if (!(_res.options & RES_DEBUG)) {
 455                                 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
 456                                        options, source);
 457                                 _res.options |= RES_DEBUG;
 458                         }
 459                         printf(";;\tdebug\n");
 460 #endif
 461                 } else {
 462                         /* XXX - print a warning here? */
 463                 }
 464                 /* skip to next run of spaces */
 465                 while (*cp && *cp != ' ' && *cp != '\t')
 466                         cp++;
 467         }
 468 }
 469
 470 #ifdef RESOLVSORT
 471 /* XXX - should really support CIDR which means explicit masks always. */
 472 static u_int32_t
 473 net_mask(in)            /* XXX - should really use system's version of this */
 474         struct in_addr in;
 475 {
 476         register u_int32_t i = ntohl(in.s_addr);
 477
 478         if (IN_CLASSA(i))
 479                 return (htonl(IN_CLASSA_NET));
 480         else if (IN_CLASSB(i))
 481                 return (htonl(IN_CLASSB_NET));
 482         return (htonl(IN_CLASSC_NET));
 483 }
 484 #endif
 485
 486 #ifdef  NeXT
 487 static int
 488 netinfo_res_init(haveenv, havesearch)
 489         int *haveenv;
 490         int *havesearch;
 491 {
 492     register    int n;
 493     void        *domain, *parent;
 494     ni_id       dir;
 495     ni_status   status;
 496     ni_namelist nl;
 497     int         nserv = 0;
 498 #ifdef RESOLVSORT
 499     int         nsort = 0;
 500 #endif
 501
 502     status = ni_open(NULL, ".", &domain);
 503     if (status == NI_OK) {
 504         ni_setreadtimeout(domain, NI_TIMEOUT);
 505         ni_setabort(domain, 1);
 506
 507         /* climb the NetInfo hierarchy to find a resolver directory */
 508         while (status == NI_OK) {
 509             status = ni_pathsearch(domain, &dir, NI_PATH_RESCONF);
 510             if (status == NI_OK) {
 511             /* found a resolver directory */
 512
 513                 if (*haveenv == 0) {
 514                     /* get the default domain name */
 515                     status = ni_lookupprop(domain, &dir, "domain", &nl);
 516                     if (status == NI_OK && nl.ni_namelist_len > 0) {
 517                         (void)strncpy(_res.defdname,
 518                                       nl.ni_namelist_val[0],
 519                                       sizeof(_res.defdname) - 1);
 520                         _res.defdname[sizeof(_res.defdname) - 1] = '\0';
 521                         ni_namelist_free(&nl);
 522                         *havesearch = 0;
 523                     }
 524
 525                     /* get search list */
 526                     status = ni_lookupprop(domain, &dir, "search", &nl);
 527                     if (status == NI_OK && nl.ni_namelist_len > 0) {
 528                         (void)strncpy(_res.defdname,
 529                                       nl.ni_namelist_val[0],
 530                                       sizeof(_res.defdname) - 1);
 531                         _res.defdname[sizeof(_res.defdname) - 1] = '\0';
 532                         /* copy  */
 533                         for (n = 0;
 534                              n < nl.ni_namelist_len && n < MAXDNSRCH;
 535                              n++) {
 536                              /* duplicate up to MAXDNSRCH servers */
 537                              char *cp = nl.ni_namelist_val[n];
 538                             _res.dnsrch[n] =
 539                                 strcpy((char *)malloc(strlen(cp) + 1), cp);
 540                         }
 541                         ni_namelist_free(&nl);
 542                         *havesearch = 1;
 543                     }
 544                 }
 545
 546                 /* get list of nameservers */
 547                 status = ni_lookupprop(domain, &dir, "nameserver", &nl);
 548                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 549                     /* copy up to MAXNS servers */
 550                     for (n = 0;
 551                          n < nl.ni_namelist_len && nserv < MAXNS;
 552                          n++) {
 553                         struct in_addr a;
 554
 555                         if (inet_aton(nl.ni_namelist_val[n], &a)) {
 556                             _res.nsaddr_list[nserv].sin_addr = a;
 557                             _res.nsaddr_list[nserv].sin_family = AF_INET;
 558                             _res.nsaddr_list[nserv].sin_port =
 559                                 htons(NAMESERVER_PORT);
 560                             nserv++;
 561                         }
 562                     }
 563                     ni_namelist_free(&nl);
 564                 }
 565
 566                 if (nserv > 1)
 567                     _res.nscount = nserv;
 568
 569 #ifdef RESOLVSORT
 570                 /* get sort order */
 571                 status = ni_lookupprop(domain, &dir, "sortlist", &nl);
 572                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 573
 574                     /* copy up to MAXRESOLVSORT address/netmask pairs */
 575                     for (n = 0;
 576                          n < nl.ni_namelist_len && nsort < MAXRESOLVSORT;
 577                          n++) {
 578                         char ch;
 579                         char *cp;
 580                         const char *sp;
 581                         struct in_addr a;
 582
 583                         cp = NULL;
 584                         for (sp = sort_mask; *sp; sp++) {
 585                                 char *cp1;
 586                                 cp1 = strchr(nl.ni_namelist_val[n], *sp);
 587                                 if (cp && cp1)
 588                                         cp = (cp < cp1)? cp : cp1;
 589                                 else if (cp1)
 590                                         cp = cp1;
 591                         }
 592                         if (cp != NULL) {
 593                                 ch = *cp;
 594                                 *cp = '\0';
 595                                 break;
 596                         }
 597                         if (inet_aton(nl.ni_namelist_val[n], &a)) {
 598                             _res.sort_list[nsort].addr = a;
 599                             if (*cp && ISSORTMASK(ch)) {
 600                                 *cp++ = ch;
 601                                 if (inet_aton(cp, &a)) {
 602                                     _res.sort_list[nsort].mask = a.s_addr;
 603                                 } else {
 604                                     _res.sort_list[nsort].mask =
 605                                         net_mask(_res.sort_list[nsort].addr);
 606                                 }
 607                             } else {
 608                                 _res.sort_list[nsort].mask =
 609                                     net_mask(_res.sort_list[nsort].addr);
 610                             }
 611                             nsort++;
 612                         }
 613                     }
 614                     ni_namelist_free(&nl);
 615                 }
 616
 617                 _res.nsort = nsort;
 618 #endif
 619
 620                 /* get resolver options */
 621                 status = ni_lookupprop(domain, &dir, "options", &nl);
 622                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 623                     res_setoptions(nl.ni_namelist_val[0], "conf");
 624                     ni_namelist_free(&nl);
 625                 }
 626
 627                 ni_free(domain);
 628                 return(1);      /* using DNS configuration from NetInfo */
 629             }
 630
 631             status = ni_open(domain, "..", &parent);
 632             ni_free(domain);
 633             if (status == NI_OK)
 634                 domain = parent;
 635         }
 636     }
 637     return(0);  /* if not using DNS configuration from NetInfo */
 638 }
 639 #endif  /* NeXT */
 640
 641 u_int16_t
 642 res_randomid()
 643 {
 644         struct timeval now;
 645
 646         gettimeofday(&now, NULL);
 647         return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
 648 }