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/types.h>
  62 #include <sys/param.h>
  63 #include <sys/socket.h>
  64 #include <sys/time.h>
  65 #include <netinet/in.h>
  66 #include <arpa/inet.h>
  67 #include <arpa/nameser.h>
  68
  69 #include <stdio.h>
  70 #include <ctype.h>
  71 #include <resolv.h>
  72 #if defined(BSD) && (BSD >= 199103)
  73 # include <unistd.h>
  74 # include <stdlib.h>
  75 # include <string.h>
  76 #else
  77 # include "../conf/portability.h"
  78 #endif
  79
  80 /*-------------------------------------- info about "sortlist" --------------
  81  * Marc Majka           1994/04/16
  82  * Allan Nathanson      1994/10/29 (BIND 4.9.3.x)
  83  *
  84  * NetInfo resolver configuration directory support.
  85  *
  86  * Allow a NetInfo directory to be created in the hierarchy which
  87  * contains the same information as the resolver configuration file.
  88  *
  89  * - The local domain name is stored as the value of the "domain" property.
  90  * - The Internet address(es) of the name server(s) are stored as values
  91  *   of the "nameserver" property.
  92  * - The name server addresses are stored as values of the "nameserver"
  93  *   property.
  94  * - The search list for host-name lookup is stored as values of the
  95  *   "search" property.
  96  * - The sortlist comprised of IP address netmask pairs are stored as
  97  *   values of the "sortlist" property. The IP address and optional netmask
  98  *   should be separated by a slash (/) or ampersand (&) character.
  99  * - Internal resolver variables can be set from the value of the "options"
 100  *   property.
 101  */
 102 #if defined(NeXT)
 103 #  include <netinfo/ni.h>
 104 #  define NI_PATH_RESCONF "/locations/resolver"
 105 #  define NI_TIMEOUT 10
 106 static int netinfo_res_init __P((int *haveenv, int *havesearch));
 107 #endif
 108
 109 #if defined(USE_OPTIONS_H)
 110 # include "../conf/options.h"
 111 #endif
 112
 113 static void res_setoptions __P((char *, char *)) internal_function;
 114
 115 #ifdef RESOLVSORT
 116 static const char sort_mask[] = "/&";
 117 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
 118 static u_int32_t net_mask __P((struct in_addr));
 119 #endif
 120
 121 #if !defined(isascii)   /* XXX - could be a function */
 122 # define isascii(c) (!(c & 0200))
 123 #endif
 124
 125 /*
 126  * Resolver state default settings.
 127  */
 128
 129 struct __res_state _res
 130 # if defined(__BIND_RES_TEXT)
 131         = { RES_TIMEOUT, }      /* Motorola, et al. */
 132 # endif
 133         ;
 134
 135 /*
 136  * Set up default settings.  If the configuration file exist, the values
 137  * there will have precedence.  Otherwise, the server address is set to
 138  * INADDR_ANY and the default domain name comes from the gethostname().
 139  *
 140  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
 141  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
 142  * since it was noted that INADDR_ANY actually meant ``the first interface
 143  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
 144  * it had to be "up" in order for you to reach your own name server.  It
 145  * was later decided that since the recommended practice is to always
 146  * install local static routes through 127.0.0.1 for all your network
 147  * interfaces, that we could solve this problem without a code change.
 148  *
 149  * The configuration file should always be used, since it is the only way
 150  * to specify a default domain.  If you are running a server on your local
 151  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
 152  * in the configuration file.
 153  *
 154  * Return 0 if completes successfully, -1 on error
 155  */
 156 int
 157 res_init()
 158 {
 159         register FILE *fp;
 160         register char *cp, **pp;
 161         register int n;
 162         char buf[MAXDNAME];
 163         int nserv = 0;    /* number of nameserver records read from file */
 164         int haveenv = 0;
 165         int havesearch = 0;
 166 #ifdef RESOLVSORT
 167         int nsort = 0;
 168         char *net;
 169 #endif
 170 #ifndef RFC1535
 171         int dots;
 172 #endif
 173
 174         /*
 175          * These three fields used to be statically initialized.  This made
 176          * it hard to use this code in a shared library.  It is necessary,
 177          * now that we're doing dynamic initialization here, that we preserve
 178          * the old semantics: if an application modifies one of these three
 179          * fields of _res before res_init() is called, res_init() will not
 180          * alter them.  Of course, if an application is setting them to
 181          * _zero_ before calling res_init(), hoping to override what used
 182          * to be the static default, we can't detect it and unexpected results
 183          * will follow.  Zero for any of these fields would make no sense,
 184          * so one can safely assume that the applications were already getting
 185          * unexpected results.
 186          *
 187          * _res.options is tricky since some apps were known to diddle the bits
 188          * before res_init() was first called. We can't replicate that semantic
 189          * with dynamic initialization (they may have turned bits off that are
 190          * set in RES_DEFAULT).  Our solution is to declare such applications
 191          * "broken".  They could fool us by setting RES_INIT but none do (yet).
 192          */
 193         if (!_res.retrans)
 194                 _res.retrans = RES_TIMEOUT;
 195         if (!_res.retry)
 196                 _res.retry = 4;
 197         if (!(_res.options & RES_INIT))
 198                 _res.options = RES_DEFAULT;
 199
 200         /*
 201          * This one used to initialize implicitly to zero, so unless the app
 202          * has set it to something in particular, we can randomize it now.
 203          */
 204         if (!_res.id)
 205                 _res.id = res_randomid();
 206
 207 #ifdef USELOOPBACK
 208         _res.nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
 209         _res.nscount = 1;
 210 #else
 211         _res.nsaddr.sin_addr.s_addr = INADDR_ANY;
 212         _res.nscount = 0;
 213 #endif
 214         _res.nsaddr.sin_family = AF_INET;
 215         _res.nsaddr.sin_port = htons(NAMESERVER_PORT);
 216         _res.ndots = 1;
 217         _res.pfcode = 0;
 218
 219         /* Allow user to override the local domain definition */
 220         if ((cp = __secure_getenv("LOCALDOMAIN")) != NULL) {
 221                 (void)strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 222                 haveenv++;
 223
 224                 /*
 225                  * Set search list to be blank-separated strings
 226                  * from rest of env value.  Permits users of LOCALDOMAIN
 227                  * to still have a search list, and anyone to set the
 228                  * one that they want to use as an individual (even more
 229                  * important now that the rfc1535 stuff restricts searches)
 230                  */
 231                 cp = _res.defdname;
 232                 pp = _res.dnsrch;
 233                 *pp++ = cp;
 234                 for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
 235                         if (*cp == '\n')        /* silly backwards compat */
 236                                 break;
 237                         else if (*cp == ' ' || *cp == '\t') {
 238                                 *cp = 0;
 239                                 n = 1;
 240                         } else if (n) {
 241                                 *pp++ = cp;
 242                                 n = 0;
 243                                 havesearch = 1;
 244                         }
 245                 }
 246                 /* null terminate last domain if there are excess */
 247                 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
 248                         cp++;
 249                 *cp = '\0';
 250                 *pp++ = 0;
 251         }
 252
 253 #define MATCH(line, name) \
 254         (!strncmp(line, name, sizeof(name) - 1) && \
 255         (line[sizeof(name) - 1] == ' ' || \
 256          line[sizeof(name) - 1] == '\t'))
 257
 258 #ifdef  NeXT
 259         if (netinfo_res_init(&haveenv, &havesearch) == 0)
 260 #endif
 261         if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
 262             /* read the config file */
 263             while (fgets_unlocked(buf, sizeof(buf), fp) != NULL) {
 264                 /* skip comments */
 265                 if (*buf == ';' || *buf == '#')
 266                         continue;
 267                 /* read default domain name */
 268                 if (MATCH(buf, "domain")) {
 269                     if (haveenv)        /* skip if have from environ */
 270                             continue;
 271                     cp = buf + sizeof("domain") - 1;
 272                     while (*cp == ' ' || *cp == '\t')
 273                             cp++;
 274                     if ((*cp == '\0') || (*cp == '\n'))
 275                             continue;
 276                     strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 277                     if ((cp = strpbrk(_res.defdname, " \t\n")) != NULL)
 278                             *cp = '\0';
 279                     havesearch = 0;
 280                     continue;
 281                 }
 282                 /* set search list */
 283                 if (MATCH(buf, "search")) {
 284                     if (haveenv)        /* skip if have from environ */
 285                             continue;
 286                     cp = buf + sizeof("search") - 1;
 287                     while (*cp == ' ' || *cp == '\t')
 288                             cp++;
 289                     if ((*cp == '\0') || (*cp == '\n'))
 290                             continue;
 291                     strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 292                     if ((cp = strchr(_res.defdname, '\n')) != NULL)
 293                             *cp = '\0';
 294                     /*
 295                      * Set search list to be blank-separated strings
 296                      * on rest of line.
 297                      */
 298                     cp = _res.defdname;
 299                     pp = _res.dnsrch;
 300                     *pp++ = cp;
 301                     for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
 302                             if (*cp == ' ' || *cp == '\t') {
 303                                     *cp = 0;
 304                                     n = 1;
 305                             } else if (n) {
 306                                     *pp++ = cp;
 307                                     n = 0;
 308                             }
 309                     }
 310                     /* null terminate last domain if there are excess */
 311                     while (*cp != '\0' && *cp != ' ' && *cp != '\t')
 312                             cp++;
 313                     *cp = '\0';
 314                     *pp++ = 0;
 315                     havesearch = 1;
 316                     continue;
 317                 }
 318                 /* read nameservers to query */
 319                 if (MATCH(buf, "nameserver") && nserv < MAXNS) {
 320                     struct in_addr a;
 321
 322                     cp = buf + sizeof("nameserver") - 1;
 323                     while (*cp == ' ' || *cp == '\t')
 324                         cp++;
 325                     if ((*cp != '\0') && (*cp != '\n') && inet_aton(cp, &a)) {
 326                         _res.nsaddr_list[nserv].sin_addr = a;
 327                         _res.nsaddr_list[nserv].sin_family = AF_INET;
 328                         _res.nsaddr_list[nserv].sin_port =
 329                                 htons(NAMESERVER_PORT);
 330                         nserv++;
 331                     }
 332                     continue;
 333                 }
 334 #ifdef RESOLVSORT
 335                 if (MATCH(buf, "sortlist")) {
 336                     struct in_addr a;
 337
 338                     cp = buf + sizeof("sortlist") - 1;
 339                     while (nsort < MAXRESOLVSORT) {
 340                         while (*cp == ' ' || *cp == '\t')
 341                             cp++;
 342                         if (*cp == '\0' || *cp == '\n' || *cp == ';')
 343                             break;
 344                         net = cp;
 345                         while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
 346                                isascii(*cp) && !isspace(*cp))
 347                                 cp++;
 348                         n = *cp;
 349                         *cp = 0;
 350                         if (inet_aton(net, &a)) {
 351                             _res.sort_list[nsort].addr = a;
 352                             if (ISSORTMASK(n)) {
 353                                 *cp++ = n;
 354                                 net = cp;
 355                                 while (*cp && *cp != ';' &&
 356                                         isascii(*cp) && !isspace(*cp))
 357                                     cp++;
 358                                 n = *cp;
 359                                 *cp = 0;
 360                                 if (inet_aton(net, &a)) {
 361                                     _res.sort_list[nsort].mask = a.s_addr;
 362                                 } else {
 363                                     _res.sort_list[nsort].mask =
 364                                         net_mask(_res.sort_list[nsort].addr);
 365                                 }
 366                             } else {
 367                                 _res.sort_list[nsort].mask =
 368                                     net_mask(_res.sort_list[nsort].addr);
 369                             }
 370                             nsort++;
 371                         }
 372                         *cp = n;
 373                     }
 374                     continue;
 375                 }
 376 #endif
 377                 if (MATCH(buf, "options")) {
 378                     res_setoptions(buf + sizeof("options") - 1, "conf");
 379                     continue;
 380                 }
 381             }
 382             if (nserv > _res.nscount)
 383                 _res.nscount = nserv;
 384 #ifdef RESOLVSORT
 385             _res.nsort = nsort;
 386 #endif
 387             (void) fclose(fp);
 388         }
 389         if (_res.defdname[0] == 0 &&
 390             __gethostname(buf, sizeof(_res.defdname) - 1) == 0 &&
 391             (cp = strchr(buf, '.')) != NULL)
 392                 strcpy(_res.defdname, cp + 1);
 393
 394         /* find components of local domain that might be searched */
 395         if (havesearch == 0) {
 396                 pp = _res.dnsrch;
 397                 *pp++ = _res.defdname;
 398                 *pp = NULL;
 399
 400 #ifndef RFC1535
 401                 dots = 0;
 402                 for (cp = _res.defdname; *cp; cp++)
 403                         dots += (*cp == '.');
 404
 405                 cp = _res.defdname;
 406                 while (pp < _res.dnsrch + MAXDFLSRCH) {
 407                         if (dots < LOCALDOMAINPARTS)
 408                                 break;
 409                         cp = strchr(cp, '.') + 1;    /* we know there is one */
 410                         *pp++ = cp;
 411                         dots--;
 412                 }
 413                 *pp = NULL;
 414 #ifdef DEBUG
 415                 if (_res.options & RES_DEBUG) {
 416                         printf(";; res_init()... default dnsrch list:\n");
 417                         for (pp = _res.dnsrch; *pp; pp++)
 418                                 printf(";;\t%s\n", *pp);
 419                         printf(";;\t..END..\n");
 420                 }
 421 #endif /* DEBUG */
 422 #endif /* !RFC1535 */
 423         }
 424
 425         if ((cp = __secure_getenv("RES_OPTIONS")) != NULL)
 426                 res_setoptions(cp, "env");
 427         _res.options |= RES_INIT;
 428         return (0);
 429 }
 430
 431 static void
 432 internal_function
 433 res_setoptions(options, source)
 434         char *options, *source;
 435 {
 436         char *cp = options;
 437         int i;
 438
 439 #ifdef DEBUG
 440         if (_res.options & RES_DEBUG)
 441                 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
 442                        options, source);
 443 #endif
 444         while (*cp) {
 445                 /* skip leading and inner runs of spaces */
 446                 while (*cp == ' ' || *cp == '\t')
 447                         cp++;
 448                 /* search for and process individual options */
 449                 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
 450                         i = atoi(cp + sizeof("ndots:") - 1);
 451                         if (i <= RES_MAXNDOTS)
 452                                 _res.ndots = i;
 453                         else
 454                                 _res.ndots = RES_MAXNDOTS;
 455 #ifdef DEBUG
 456                         if (_res.options & RES_DEBUG)
 457                                 printf(";;\tndots=%d\n", _res.ndots);
 458 #endif
 459                 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
 460 #ifdef DEBUG
 461                         if (!(_res.options & RES_DEBUG)) {
 462                                 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
 463                                        options, source);
 464                                 _res.options |= RES_DEBUG;
 465                         }
 466                         printf(";;\tdebug\n");
 467 #endif
 468                 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
 469                         _res.options |= RES_USE_INET6;
 470                 } else {
 471                         /* XXX - print a warning here? */
 472                 }
 473                 /* skip to next run of spaces */
 474                 while (*cp && *cp != ' ' && *cp != '\t')
 475                         cp++;
 476         }
 477 }
 478
 479 #ifdef RESOLVSORT
 480 /* XXX - should really support CIDR which means explicit masks always. */
 481 static u_int32_t
 482 net_mask(in)            /* XXX - should really use system's version of this */
 483         struct in_addr in;
 484 {
 485         register u_int32_t i = ntohl(in.s_addr);
 486
 487         if (IN_CLASSA(i))
 488                 return (htonl(IN_CLASSA_NET));
 489         else if (IN_CLASSB(i))
 490                 return (htonl(IN_CLASSB_NET));
 491         return (htonl(IN_CLASSC_NET));
 492 }
 493 #endif
 494
 495 #ifdef  NeXT
 496 static int
 497 netinfo_res_init(haveenv, havesearch)
 498         int *haveenv;
 499         int *havesearch;
 500 {
 501     register    int n;
 502     void        *domain, *parent;
 503     ni_id       dir;
 504     ni_status   status;
 505     ni_namelist nl;
 506     int         nserv = 0;
 507 #ifdef RESOLVSORT
 508     int         nsort = 0;
 509 #endif
 510
 511     status = ni_open(NULL, ".", &domain);
 512     if (status == NI_OK) {
 513         ni_setreadtimeout(domain, NI_TIMEOUT);
 514         ni_setabort(domain, 1);
 515
 516         /* climb the NetInfo hierarchy to find a resolver directory */
 517         while (status == NI_OK) {
 518             status = ni_pathsearch(domain, &dir, NI_PATH_RESCONF);
 519             if (status == NI_OK) {
 520             /* found a resolver directory */
 521
 522                 if (*haveenv == 0) {
 523                     /* get the default domain name */
 524                     status = ni_lookupprop(domain, &dir, "domain", &nl);
 525                     if (status == NI_OK && nl.ni_namelist_len > 0) {
 526                         (void)strncpy(_res.defdname,
 527                                       nl.ni_namelist_val[0],
 528                                       sizeof(_res.defdname) - 1);
 529                         _res.defdname[sizeof(_res.defdname) - 1] = '\0';
 530                         ni_namelist_free(&nl);
 531                         *havesearch = 0;
 532                     }
 533
 534                     /* get search list */
 535                     status = ni_lookupprop(domain, &dir, "search", &nl);
 536                     if (status == NI_OK && nl.ni_namelist_len > 0) {
 537                         (void)strncpy(_res.defdname,
 538                                       nl.ni_namelist_val[0],
 539                                       sizeof(_res.defdname) - 1);
 540                         _res.defdname[sizeof(_res.defdname) - 1] = '\0';
 541                         /* copy  */
 542                         for (n = 0;
 543                              n < nl.ni_namelist_len && n < MAXDNSRCH;
 544                              n++) {
 545                              /* duplicate up to MAXDNSRCH servers */
 546                              char *cp = nl.ni_namelist_val[n];
 547                             _res.dnsrch[n] =
 548                                 strcpy((char *)malloc(strlen(cp) + 1), cp);
 549                         }
 550                         ni_namelist_free(&nl);
 551                         *havesearch = 1;
 552                     }
 553                 }
 554
 555                 /* get list of nameservers */
 556                 status = ni_lookupprop(domain, &dir, "nameserver", &nl);
 557                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 558                     /* copy up to MAXNS servers */
 559                     for (n = 0;
 560                          n < nl.ni_namelist_len && nserv < MAXNS;
 561                          n++) {
 562                         struct in_addr a;
 563
 564                         if (inet_aton(nl.ni_namelist_val[n], &a)) {
 565                             _res.nsaddr_list[nserv].sin_addr = a;
 566                             _res.nsaddr_list[nserv].sin_family = AF_INET;
 567                             _res.nsaddr_list[nserv].sin_port =
 568                                 htons(NAMESERVER_PORT);
 569                             nserv++;
 570                         }
 571                     }
 572                     ni_namelist_free(&nl);
 573                 }
 574
 575                 if (nserv > _res.nscount)
 576                     _res.nscount = nserv;
 577
 578 #ifdef RESOLVSORT
 579                 /* get sort order */
 580                 status = ni_lookupprop(domain, &dir, "sortlist", &nl);
 581                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 582
 583                     /* copy up to MAXRESOLVSORT address/netmask pairs */
 584                     for (n = 0;
 585                          n < nl.ni_namelist_len && nsort < MAXRESOLVSORT;
 586                          n++) {
 587                         char ch;
 588                         char *cp;
 589                         const char *sp;
 590                         struct in_addr a;
 591
 592                         cp = NULL;
 593                         for (sp = sort_mask; *sp; sp++) {
 594                                 char *cp1;
 595                                 cp1 = strchr(nl.ni_namelist_val[n], *sp);
 596                                 if (cp && cp1)
 597                                         cp = (cp < cp1)? cp : cp1;
 598                                 else if (cp1)
 599                                         cp = cp1;
 600                         }
 601                         if (cp != NULL) {
 602                                 ch = *cp;
 603                                 *cp = '\0';
 604                                 break;
 605                         }
 606                         if (inet_aton(nl.ni_namelist_val[n], &a)) {
 607                             _res.sort_list[nsort].addr = a;
 608                             if (*cp && ISSORTMASK(ch)) {
 609                                 *cp++ = ch;
 610                                 if (inet_aton(cp, &a)) {
 611                                     _res.sort_list[nsort].mask = a.s_addr;
 612                                 } else {
 613                                     _res.sort_list[nsort].mask =
 614                                         net_mask(_res.sort_list[nsort].addr);
 615                                 }
 616                             } else {
 617                                 _res.sort_list[nsort].mask =
 618                                     net_mask(_res.sort_list[nsort].addr);
 619                             }
 620                             nsort++;
 621                         }
 622                     }
 623                     ni_namelist_free(&nl);
 624                 }
 625
 626                 _res.nsort = nsort;
 627 #endif
 628
 629                 /* get resolver options */
 630                 status = ni_lookupprop(domain, &dir, "options", &nl);
 631                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 632                     res_setoptions(nl.ni_namelist_val[0], "conf");
 633                     ni_namelist_free(&nl);
 634                 }
 635
 636                 ni_free(domain);
 637                 return(1);      /* using DNS configuration from NetInfo */
 638             }
 639
 640             status = ni_open(domain, "..", &parent);
 641             ni_free(domain);
 642             if (status == NI_OK)
 643                 domain = parent;
 644         }
 645     }
 646     return(0);  /* if not using DNS configuration from NetInfo */
 647 }
 648 #endif  /* NeXT */
 649
 650 u_int
 651 res_randomid()
 652 {
 653         struct timeval now;
 654
 655         __gettimeofday(&now, NULL);
 656         return (0xffff & (now.tv_sec ^ now.tv_usec ^ __getpid()));
 657 }