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 seperated 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 *));
 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
 131 /*
 132  * Set up default settings.  If the configuration file exist, the values
 133  * there will have precedence.  Otherwise, the server address is set to
 134  * INADDR_ANY and the default domain name comes from the gethostname().
 135  *
 136  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
 137  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
 138  * since it was noted that INADDR_ANY actually meant ``the first interface
 139  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
 140  * it had to be "up" in order for you to reach your own name server.  It
 141  * was later decided that since the recommended practice is to always
 142  * install local static routes through 127.0.0.1 for all your network
 143  * interfaces, that we could solve this problem without a code change.
 144  *
 145  * The configuration file should always be used, since it is the only way
 146  * to specify a default domain.  If you are running a server on your local
 147  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
 148  * in the configuration file.
 149  *
 150  * Return 0 if completes successfully, -1 on error
 151  */
 152 int
 153 res_init()
 154 {
 155         register FILE *fp;
 156         register char *cp, **pp;
 157         register int n;
 158         char buf[BUFSIZ];
 159         int nserv = 0;    /* number of nameserver records read from file */
 160         int haveenv = 0;
 161         int havesearch = 0;
 162 #ifdef RESOLVSORT
 163         int nsort = 0;
 164         char *net;
 165 #endif
 166 #ifndef RFC1535
 167         int dots;
 168 #endif
 169
 170         /*
 171          * These three fields used to be statically initialized.  This made
 172          * it hard to use this code in a shared library.  It is necessary,
 173          * now that we're doing dynamic initialization here, that we preserve
 174          * the old semantics: if an application modifies one of these three
 175          * fields of _res before res_init() is called, res_init() will not
 176          * alter them.  Of course, if an application is setting them to
 177          * _zero_ before calling res_init(), hoping to override what used
 178          * to be the static default, we can't detect it and unexpected results
 179          * will follow.  Zero for any of these fields would make no sense,
 180          * so one can safely assume that the applications were already getting
 181          * unexpected results.
 182          *
 183          * _res.options is tricky since some apps were known to diddle the bits
 184          * before res_init() was first called. We can't replicate that semantic
 185          * with dynamic initialization (they may have turned bits off that are
 186          * set in RES_DEFAULT).  Our solution is to declare such applications
 187          * "broken".  They could fool us by setting RES_INIT but none do (yet).
 188          */
 189         if (!_res.retrans)
 190                 _res.retrans = RES_TIMEOUT;
 191         if (!_res.retry)
 192                 _res.retry = 4;
 193         if (!(_res.options & RES_INIT))
 194                 _res.options = RES_DEFAULT;
 195
 196         /*
 197          * This one used to initialize implicitly to zero, so unless the app
 198          * has set it to something in particular, we can randomize it now.
 199          */
 200         if (!_res.id)
 201                 _res.id = res_randomid();
 202
 203 #ifdef USELOOPBACK
 204         _res.nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
 205 #else
 206         _res.nsaddr.sin_addr.s_addr = INADDR_ANY;
 207 #endif
 208         _res.nsaddr.sin_family = AF_INET;
 209         _res.nsaddr.sin_port = htons(NAMESERVER_PORT);
 210         _res.nscount = 1;
 211         _res.ndots = 1;
 212         _res.pfcode = 0;
 213
 214         /* Allow user to override the local domain definition */
 215         if ((cp = getenv("LOCALDOMAIN")) != NULL) {
 216                 (void)strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 217                 haveenv++;
 218
 219                 /*
 220                  * Set search list to be blank-separated strings
 221                  * from rest of env value.  Permits users of LOCALDOMAIN
 222                  * to still have a search list, and anyone to set the
 223                  * one that they want to use as an individual (even more
 224                  * important now that the rfc1535 stuff restricts searches)
 225                  */
 226                 cp = _res.defdname;
 227                 pp = _res.dnsrch;
 228                 *pp++ = cp;
 229                 for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
 230                         if (*cp == '\n')        /* silly backwards compat */
 231                                 break;
 232                         else if (*cp == ' ' || *cp == '\t') {
 233                                 *cp = 0;
 234                                 n = 1;
 235                         } else if (n) {
 236                                 *pp++ = cp;
 237                                 n = 0;
 238                                 havesearch = 1;
 239                         }
 240                 }
 241                 /* null terminate last domain if there are excess */
 242                 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
 243                         cp++;
 244                 *cp = '\0';
 245                 *pp++ = 0;
 246         }
 247
 248 #define MATCH(line, name) \
 249         (!strncmp(line, name, sizeof(name) - 1) && \
 250         (line[sizeof(name) - 1] == ' ' || \
 251          line[sizeof(name) - 1] == '\t'))
 252
 253 #ifdef  NeXT
 254         if (netinfo_res_init(&haveenv, &havesearch) == 0)
 255 #endif
 256         if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
 257             /* read the config file */
 258             while (fgets(buf, sizeof(buf), fp) != NULL) {
 259                 /* skip comments */
 260                 if (*buf == ';' || *buf == '#')
 261                         continue;
 262                 /* read default domain name */
 263                 if (MATCH(buf, "domain")) {
 264                     if (haveenv)        /* skip if have from environ */
 265                             continue;
 266                     cp = buf + sizeof("domain") - 1;
 267                     while (*cp == ' ' || *cp == '\t')
 268                             cp++;
 269                     if ((*cp == '\0') || (*cp == '\n'))
 270                             continue;
 271                     strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 272                     if ((cp = strpbrk(_res.defdname, " \t\n")) != NULL)
 273                             *cp = '\0';
 274                     havesearch = 0;
 275                     continue;
 276                 }
 277                 /* set search list */
 278                 if (MATCH(buf, "search")) {
 279                     if (haveenv)        /* skip if have from environ */
 280                             continue;
 281                     cp = buf + sizeof("search") - 1;
 282                     while (*cp == ' ' || *cp == '\t')
 283                             cp++;
 284                     if ((*cp == '\0') || (*cp == '\n'))
 285                             continue;
 286                     strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 287                     if ((cp = strchr(_res.defdname, '\n')) != NULL)
 288                             *cp = '\0';
 289                     /*
 290                      * Set search list to be blank-separated strings
 291                      * on rest of line.
 292                      */
 293                     cp = _res.defdname;
 294                     pp = _res.dnsrch;
 295                     *pp++ = cp;
 296                     for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
 297                             if (*cp == ' ' || *cp == '\t') {
 298                                     *cp = 0;
 299                                     n = 1;
 300                             } else if (n) {
 301                                     *pp++ = cp;
 302                                     n = 0;
 303                             }
 304                     }
 305                     /* null terminate last domain if there are excess */
 306                     while (*cp != '\0' && *cp != ' ' && *cp != '\t')
 307                             cp++;
 308                     *cp = '\0';
 309                     *pp++ = 0;
 310                     havesearch = 1;
 311                     continue;
 312                 }
 313                 /* read nameservers to query */
 314                 if (MATCH(buf, "nameserver") && nserv < MAXNS) {
 315                     struct in_addr a;
 316
 317                     cp = buf + sizeof("nameserver") - 1;
 318                     while (*cp == ' ' || *cp == '\t')
 319                         cp++;
 320                     if ((*cp != '\0') && (*cp != '\n') && inet_aton(cp, &a)) {
 321                         _res.nsaddr_list[nserv].sin_addr = a;
 322                         _res.nsaddr_list[nserv].sin_family = AF_INET;
 323                         _res.nsaddr_list[nserv].sin_port =
 324                                 htons(NAMESERVER_PORT);
 325                         nserv++;
 326                     }
 327                     continue;
 328                 }
 329 #ifdef RESOLVSORT
 330                 if (MATCH(buf, "sortlist")) {
 331                     struct in_addr a;
 332
 333                     cp = buf + sizeof("sortlist") - 1;
 334                     while (nsort < MAXRESOLVSORT) {
 335                         while (*cp == ' ' || *cp == '\t')
 336                             cp++;
 337                         if (*cp == '\0' || *cp == '\n' || *cp == ';')
 338                             break;
 339                         net = cp;
 340                         while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
 341                                isascii(*cp) && !isspace(*cp))
 342                                 cp++;
 343                         n = *cp;
 344                         *cp = 0;
 345                         if (inet_aton(net, &a)) {
 346                             _res.sort_list[nsort].addr = a;
 347                             if (ISSORTMASK(n)) {
 348                                 *cp++ = n;
 349                                 net = cp;
 350                                 while (*cp && *cp != ';' &&
 351                                         isascii(*cp) && !isspace(*cp))
 352                                     cp++;
 353                                 n = *cp;
 354                                 *cp = 0;
 355                                 if (inet_aton(net, &a)) {
 356                                     _res.sort_list[nsort].mask = a.s_addr;
 357                                 } else {
 358                                     _res.sort_list[nsort].mask =
 359                                         net_mask(_res.sort_list[nsort].addr);
 360                                 }
 361                             } else {
 362                                 _res.sort_list[nsort].mask =
 363                                     net_mask(_res.sort_list[nsort].addr);
 364                             }
 365                             nsort++;
 366                         }
 367                         *cp = n;
 368                     }
 369                     continue;
 370                 }
 371 #endif
 372                 if (MATCH(buf, "options")) {
 373                     res_setoptions(buf + sizeof("options") - 1, "conf");
 374                     continue;
 375                 }
 376             }
 377             if (nserv > 1)
 378                 _res.nscount = nserv;
 379 #ifdef RESOLVSORT
 380             _res.nsort = nsort;
 381 #endif
 382             (void) fclose(fp);
 383         }
 384         if (_res.defdname[0] == 0 &&
 385             gethostname(buf, sizeof(_res.defdname) - 1) == 0 &&
 386             (cp = strchr(buf, '.')) != NULL)
 387                 strcpy(_res.defdname, cp + 1);
 388
 389         /* find components of local domain that might be searched */
 390         if (havesearch == 0) {
 391                 pp = _res.dnsrch;
 392                 *pp++ = _res.defdname;
 393                 *pp = NULL;
 394
 395 #ifndef RFC1535
 396                 dots = 0;
 397                 for (cp = _res.defdname; *cp; cp++)
 398                         dots += (*cp == '.');
 399
 400                 cp = _res.defdname;
 401                 while (pp < _res.dnsrch + MAXDFLSRCH) {
 402                         if (dots < LOCALDOMAINPARTS)
 403                                 break;
 404                         cp = strchr(cp, '.') + 1;    /* we know there is one */
 405                         *pp++ = cp;
 406                         dots--;
 407                 }
 408                 *pp = NULL;
 409 #ifdef DEBUG
 410                 if (_res.options & RES_DEBUG) {
 411                         printf(";; res_init()... default dnsrch list:\n");
 412                         for (pp = _res.dnsrch; *pp; pp++)
 413                                 printf(";;\t%s\n", *pp);
 414                         printf(";;\t..END..\n");
 415                 }
 416 #endif /* DEBUG */
 417 #endif /* !RFC1535 */
 418         }
 419
 420         if ((cp = getenv("RES_OPTIONS")) != NULL)
 421                 res_setoptions(cp, "env");
 422         _res.options |= RES_INIT;
 423         return (0);
 424 }
 425
 426 static void
 427 res_setoptions(options, source)
 428         char *options, *source;
 429 {
 430         char *cp = options;
 431         int i;
 432
 433 #ifdef DEBUG
 434         if (_res.options & RES_DEBUG)
 435                 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
 436                        options, source);
 437 #endif
 438         while (*cp) {
 439                 /* skip leading and inner runs of spaces */
 440                 while (*cp == ' ' || *cp == '\t')
 441                         cp++;
 442                 /* search for and process individual options */
 443                 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
 444                         i = atoi(cp + sizeof("ndots:") - 1);
 445                         if (i <= RES_MAXNDOTS)
 446                                 _res.ndots = i;
 447                         else
 448                                 _res.ndots = RES_MAXNDOTS;
 449 #ifdef DEBUG
 450                         if (_res.options & RES_DEBUG)
 451                                 printf(";;\tndots=%d\n", _res.ndots);
 452 #endif
 453                 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
 454 #ifdef DEBUG
 455                         if (!(_res.options & RES_DEBUG)) {
 456                                 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
 457                                        options, source);
 458                                 _res.options |= RES_DEBUG;
 459                         }
 460                         printf(";;\tdebug\n");
 461 #endif
 462                 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
 463                         _res.options |= RES_USE_INET6;
 464                 } else {
 465                         /* XXX - print a warning here? */
 466                 }
 467                 /* skip to next run of spaces */
 468                 while (*cp && *cp != ' ' && *cp != '\t')
 469                         cp++;
 470         }
 471 }
 472
 473 #ifdef RESOLVSORT
 474 /* XXX - should really support CIDR which means explicit masks always. */
 475 static u_int32_t
 476 net_mask(in)            /* XXX - should really use system's version of this */
 477         struct in_addr in;
 478 {
 479         register u_int32_t i = ntohl(in.s_addr);
 480
 481         if (IN_CLASSA(i))
 482                 return (htonl(IN_CLASSA_NET));
 483         else if (IN_CLASSB(i))
 484                 return (htonl(IN_CLASSB_NET));
 485         return (htonl(IN_CLASSC_NET));
 486 }
 487 #endif
 488
 489 #ifdef  NeXT
 490 static int
 491 netinfo_res_init(haveenv, havesearch)
 492         int *haveenv;
 493         int *havesearch;
 494 {
 495     register    int n;
 496     void        *domain, *parent;
 497     ni_id       dir;
 498     ni_status   status;
 499     ni_namelist nl;
 500     int         nserv = 0;
 501 #ifdef RESOLVSORT
 502     int         nsort = 0;
 503 #endif
 504
 505     status = ni_open(NULL, ".", &domain);
 506     if (status == NI_OK) {
 507         ni_setreadtimeout(domain, NI_TIMEOUT);
 508         ni_setabort(domain, 1);
 509
 510         /* climb the NetInfo hierarchy to find a resolver directory */
 511         while (status == NI_OK) {
 512             status = ni_pathsearch(domain, &dir, NI_PATH_RESCONF);
 513             if (status == NI_OK) {
 514             /* found a resolver directory */
 515
 516                 if (*haveenv == 0) {
 517                     /* get the default domain name */
 518                     status = ni_lookupprop(domain, &dir, "domain", &nl);
 519                     if (status == NI_OK && nl.ni_namelist_len > 0) {
 520                         (void)strncpy(_res.defdname,
 521                                       nl.ni_namelist_val[0],
 522                                       sizeof(_res.defdname) - 1);
 523                         _res.defdname[sizeof(_res.defdname) - 1] = '\0';
 524                         ni_namelist_free(&nl);
 525                         *havesearch = 0;
 526                     }
 527
 528                     /* get search list */
 529                     status = ni_lookupprop(domain, &dir, "search", &nl);
 530                     if (status == NI_OK && nl.ni_namelist_len > 0) {
 531                         (void)strncpy(_res.defdname,
 532                                       nl.ni_namelist_val[0],
 533                                       sizeof(_res.defdname) - 1);
 534                         _res.defdname[sizeof(_res.defdname) - 1] = '\0';
 535                         /* copy  */
 536                         for (n = 0;
 537                              n < nl.ni_namelist_len && n < MAXDNSRCH;
 538                              n++) {
 539                              /* duplicate up to MAXDNSRCH servers */
 540                              char *cp = nl.ni_namelist_val[n];
 541                             _res.dnsrch[n] =
 542                                 strcpy((char *)malloc(strlen(cp) + 1), cp);
 543                         }
 544                         ni_namelist_free(&nl);
 545                         *havesearch = 1;
 546                     }
 547                 }
 548
 549                 /* get list of nameservers */
 550                 status = ni_lookupprop(domain, &dir, "nameserver", &nl);
 551                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 552                     /* copy up to MAXNS servers */
 553                     for (n = 0;
 554                          n < nl.ni_namelist_len && nserv < MAXNS;
 555                          n++) {
 556                         struct in_addr a;
 557
 558                         if (inet_aton(nl.ni_namelist_val[n], &a)) {
 559                             _res.nsaddr_list[nserv].sin_addr = a;
 560                             _res.nsaddr_list[nserv].sin_family = AF_INET;
 561                             _res.nsaddr_list[nserv].sin_port =
 562                                 htons(NAMESERVER_PORT);
 563                             nserv++;
 564                         }
 565                     }
 566                     ni_namelist_free(&nl);
 567                 }
 568
 569                 if (nserv > 1)
 570                     _res.nscount = nserv;
 571
 572 #ifdef RESOLVSORT
 573                 /* get sort order */
 574                 status = ni_lookupprop(domain, &dir, "sortlist", &nl);
 575                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 576
 577                     /* copy up to MAXRESOLVSORT address/netmask pairs */
 578                     for (n = 0;
 579                          n < nl.ni_namelist_len && nsort < MAXRESOLVSORT;
 580                          n++) {
 581                         char ch;
 582                         char *cp;
 583                         const char *sp;
 584                         struct in_addr a;
 585
 586                         cp = NULL;
 587                         for (sp = sort_mask; *sp; sp++) {
 588                                 char *cp1;
 589                                 cp1 = strchr(nl.ni_namelist_val[n], *sp);
 590                                 if (cp && cp1)
 591                                         cp = (cp < cp1)? cp : cp1;
 592                                 else if (cp1)
 593                                         cp = cp1;
 594                         }
 595                         if (cp != NULL) {
 596                                 ch = *cp;
 597                                 *cp = '\0';
 598                                 break;
 599                         }
 600                         if (inet_aton(nl.ni_namelist_val[n], &a)) {
 601                             _res.sort_list[nsort].addr = a;
 602                             if (*cp && ISSORTMASK(ch)) {
 603                                 *cp++ = ch;
 604                                 if (inet_aton(cp, &a)) {
 605                                     _res.sort_list[nsort].mask = a.s_addr;
 606                                 } else {
 607                                     _res.sort_list[nsort].mask =
 608                                         net_mask(_res.sort_list[nsort].addr);
 609                                 }
 610                             } else {
 611                                 _res.sort_list[nsort].mask =
 612                                     net_mask(_res.sort_list[nsort].addr);
 613                             }
 614                             nsort++;
 615                         }
 616                     }
 617                     ni_namelist_free(&nl);
 618                 }
 619
 620                 _res.nsort = nsort;
 621 #endif
 622
 623                 /* get resolver options */
 624                 status = ni_lookupprop(domain, &dir, "options", &nl);
 625                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 626                     res_setoptions(nl.ni_namelist_val[0], "conf");
 627                     ni_namelist_free(&nl);
 628                 }
 629
 630                 ni_free(domain);
 631                 return(1);      /* using DNS configuration from NetInfo */
 632             }
 633
 634             status = ni_open(domain, "..", &parent);
 635             ni_free(domain);
 636             if (status == NI_OK)
 637                 domain = parent;
 638         }
 639     }
 640     return(0);  /* if not using DNS configuration from NetInfo */
 641 }
 642 #endif  /* NeXT */
 643
 644 u_int16_t
 645 res_randomid()
 646 {
 647         struct timeval now;
 648
 649         gettimeofday(&now, NULL);
 650         return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
 651 }