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  * 4. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  * -
  31  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  32  *
  33  * Permission to use, copy, modify, and distribute this software for any
  34  * purpose with or without fee is hereby granted, provided that the above
  35  * copyright notice and this permission notice appear in all copies, and that
  36  * the name of Digital Equipment Corporation not be used in advertising or
  37  * publicity pertaining to distribution of the document or software without
  38  * specific, written prior permission.
  39  *
  40  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  41  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  42  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  43  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  44  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  45  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  46  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  47  * SOFTWARE.
  48  * -
  49  * --Copyright--
  50  */
  51
  52 #if defined(LIBC_SCCS) && !defined(lint)
  53 static char sccsid[] = "@(#)res_init.c  8.1 (Berkeley) 6/7/93";
  54 static char rcsid[] = "$Id$";
  55 #endif /* LIBC_SCCS and not lint */
  56
  57 #include <sys/types.h>
  58 #include <sys/param.h>
  59 #include <sys/socket.h>
  60 #include <sys/time.h>
  61 #include <netinet/in.h>
  62 #include <arpa/inet.h>
  63 #include <arpa/nameser.h>
  64
  65 #include <stdio.h>
  66 #include <ctype.h>
  67 #include <resolv.h>
  68 #if defined(BSD) && (BSD >= 199103)
  69 # include <unistd.h>
  70 # include <stdlib.h>
  71 # include <string.h>
  72 #else
  73 # include "../conf/portability.h"
  74 #endif
  75
  76 /*-------------------------------------- info about "sortlist" --------------
  77  * Marc Majka           1994/04/16
  78  * Allan Nathanson      1994/10/29 (BIND 4.9.3.x)
  79  *
  80  * NetInfo resolver configuration directory support.
  81  *
  82  * Allow a NetInfo directory to be created in the hierarchy which
  83  * contains the same information as the resolver configuration file.
  84  *
  85  * - The local domain name is stored as the value of the "domain" property.
  86  * - The Internet address(es) of the name server(s) are stored as values
  87  *   of the "nameserver" property.
  88  * - The name server addresses are stored as values of the "nameserver"
  89  *   property.
  90  * - The search list for host-name lookup is stored as values of the
  91  *   "search" property.
  92  * - The sortlist comprised of IP address netmask pairs are stored as
  93  *   values of the "sortlist" property. The IP address and optional netmask
  94  *   should be separated by a slash (/) or ampersand (&) character.
  95  * - Internal resolver variables can be set from the value of the "options"
  96  *   property.
  97  */
  98 #if defined(NeXT)
  99 #  include <netinfo/ni.h>
 100 #  define NI_PATH_RESCONF "/locations/resolver"
 101 #  define NI_TIMEOUT 10
 102 static int netinfo_res_init __P((int *haveenv, int *havesearch));
 103 #endif
 104
 105 #if defined(USE_OPTIONS_H)
 106 # include "../conf/options.h"
 107 #endif
 108
 109 static void res_setoptions __P((char *, char *)) internal_function;
 110
 111 #ifdef RESOLVSORT
 112 static const char sort_mask[] = "/&";
 113 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
 114 static u_int32_t net_mask __P((struct in_addr));
 115 #endif
 116
 117 #if !defined(isascii)   /* XXX - could be a function */
 118 # define isascii(c) (!(c & 0200))
 119 #endif
 120
 121 /*
 122  * Resolver state default settings.
 123  */
 124
 125 struct __res_state _res
 126 # if defined(__BIND_RES_TEXT)
 127         = { RES_TIMEOUT, }      /* Motorola, et al. */
 128 # endif
 129         ;
 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[MAXDNAME];
 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         _res.nscount = 1;
 206 #else
 207         _res.nsaddr.sin_addr.s_addr = INADDR_ANY;
 208         _res.nscount = 0;
 209 #endif
 210         _res.nsaddr.sin_family = AF_INET;
 211         _res.nsaddr.sin_port = htons(NAMESERVER_PORT);
 212         _res.ndots = 1;
 213         _res.pfcode = 0;
 214
 215         /* Allow user to override the local domain definition */
 216         if ((cp = __secure_getenv("LOCALDOMAIN")) != NULL) {
 217                 (void)strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 218                 haveenv++;
 219
 220                 /*
 221                  * Set search list to be blank-separated strings
 222                  * from rest of env value.  Permits users of LOCALDOMAIN
 223                  * to still have a search list, and anyone to set the
 224                  * one that they want to use as an individual (even more
 225                  * important now that the rfc1535 stuff restricts searches)
 226                  */
 227                 cp = _res.defdname;
 228                 pp = _res.dnsrch;
 229                 *pp++ = cp;
 230                 for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
 231                         if (*cp == '\n')        /* silly backwards compat */
 232                                 break;
 233                         else if (*cp == ' ' || *cp == '\t') {
 234                                 *cp = 0;
 235                                 n = 1;
 236                         } else if (n) {
 237                                 *pp++ = cp;
 238                                 n = 0;
 239                                 havesearch = 1;
 240                         }
 241                 }
 242                 /* null terminate last domain if there are excess */
 243                 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
 244                         cp++;
 245                 *cp = '\0';
 246                 *pp++ = 0;
 247         }
 248
 249 #define MATCH(line, name) \
 250         (!strncmp(line, name, sizeof(name) - 1) && \
 251         (line[sizeof(name) - 1] == ' ' || \
 252          line[sizeof(name) - 1] == '\t'))
 253
 254 #ifdef  NeXT
 255         if (netinfo_res_init(&haveenv, &havesearch) == 0)
 256 #endif
 257         if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
 258             /* read the config file */
 259             while (fgets_unlocked(buf, sizeof(buf), fp) != NULL) {
 260                 /* skip comments */
 261                 if (*buf == ';' || *buf == '#')
 262                         continue;
 263                 /* read default domain name */
 264                 if (MATCH(buf, "domain")) {
 265                     if (haveenv)        /* skip if have from environ */
 266                             continue;
 267                     cp = buf + sizeof("domain") - 1;
 268                     while (*cp == ' ' || *cp == '\t')
 269                             cp++;
 270                     if ((*cp == '\0') || (*cp == '\n'))
 271                             continue;
 272                     strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 273                     if ((cp = strpbrk(_res.defdname, " \t\n")) != NULL)
 274                             *cp = '\0';
 275                     havesearch = 0;
 276                     continue;
 277                 }
 278                 /* set search list */
 279                 if (MATCH(buf, "search")) {
 280                     if (haveenv)        /* skip if have from environ */
 281                             continue;
 282                     cp = buf + sizeof("search") - 1;
 283                     while (*cp == ' ' || *cp == '\t')
 284                             cp++;
 285                     if ((*cp == '\0') || (*cp == '\n'))
 286                             continue;
 287                     strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 288                     *__strchrnul (_res.defdname, '\n') = '\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 > _res.nscount)
 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 = __rawmemchr(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 = __secure_getenv("RES_OPTIONS")) != NULL)
 421                 res_setoptions(cp, "env");
 422         _res.options |= RES_INIT;
 423         return (0);
 424 }
 425
 426 static void
 427 internal_function
 428 res_setoptions(options, source)
 429         char *options, *source;
 430 {
 431         char *cp = options;
 432         int i;
 433
 434 #ifdef DEBUG
 435         if (_res.options & RES_DEBUG)
 436                 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
 437                        options, source);
 438 #endif
 439         while (*cp) {
 440                 /* skip leading and inner runs of spaces */
 441                 while (*cp == ' ' || *cp == '\t')
 442                         cp++;
 443                 /* search for and process individual options */
 444                 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
 445                         i = atoi(cp + sizeof("ndots:") - 1);
 446                         if (i <= RES_MAXNDOTS)
 447                                 _res.ndots = i;
 448                         else
 449                                 _res.ndots = RES_MAXNDOTS;
 450 #ifdef DEBUG
 451                         if (_res.options & RES_DEBUG)
 452                                 printf(";;\tndots=%d\n", _res.ndots);
 453 #endif
 454                 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
 455 #ifdef DEBUG
 456                         if (!(_res.options & RES_DEBUG)) {
 457                                 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
 458                                        options, source);
 459                                 _res.options |= RES_DEBUG;
 460                         }
 461                         printf(";;\tdebug\n");
 462 #endif
 463                 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
 464                         _res.options |= RES_USE_INET6;
 465                 } else {
 466                         /* XXX - print a warning here? */
 467                 }
 468                 /* skip to next run of spaces */
 469                 while (*cp && *cp != ' ' && *cp != '\t')
 470                         cp++;
 471         }
 472 }
 473
 474 #ifdef RESOLVSORT
 475 /* XXX - should really support CIDR which means explicit masks always. */
 476 static u_int32_t
 477 net_mask(in)            /* XXX - should really use system's version of this */
 478         struct in_addr in;
 479 {
 480         register u_int32_t i = ntohl(in.s_addr);
 481
 482         if (IN_CLASSA(i))
 483                 return (htonl(IN_CLASSA_NET));
 484         else if (IN_CLASSB(i))
 485                 return (htonl(IN_CLASSB_NET));
 486         return (htonl(IN_CLASSC_NET));
 487 }
 488 #endif
 489
 490 #ifdef  NeXT
 491 static int
 492 netinfo_res_init(haveenv, havesearch)
 493         int *haveenv;
 494         int *havesearch;
 495 {
 496     register    int n;
 497     void        *domain, *parent;
 498     ni_id       dir;
 499     ni_status   status;
 500     ni_namelist nl;
 501     int         nserv = 0;
 502 #ifdef RESOLVSORT
 503     int         nsort = 0;
 504 #endif
 505
 506     status = ni_open(NULL, ".", &domain);
 507     if (status == NI_OK) {
 508         ni_setreadtimeout(domain, NI_TIMEOUT);
 509         ni_setabort(domain, 1);
 510
 511         /* climb the NetInfo hierarchy to find a resolver directory */
 512         while (status == NI_OK) {
 513             status = ni_pathsearch(domain, &dir, NI_PATH_RESCONF);
 514             if (status == NI_OK) {
 515             /* found a resolver directory */
 516
 517                 if (*haveenv == 0) {
 518                     /* get the default domain name */
 519                     status = ni_lookupprop(domain, &dir, "domain", &nl);
 520                     if (status == NI_OK && nl.ni_namelist_len > 0) {
 521                         (void)strncpy(_res.defdname,
 522                                       nl.ni_namelist_val[0],
 523                                       sizeof(_res.defdname) - 1);
 524                         _res.defdname[sizeof(_res.defdname) - 1] = '\0';
 525                         ni_namelist_free(&nl);
 526                         *havesearch = 0;
 527                     }
 528
 529                     /* get search list */
 530                     status = ni_lookupprop(domain, &dir, "search", &nl);
 531                     if (status == NI_OK && nl.ni_namelist_len > 0) {
 532                         (void)strncpy(_res.defdname,
 533                                       nl.ni_namelist_val[0],
 534                                       sizeof(_res.defdname) - 1);
 535                         _res.defdname[sizeof(_res.defdname) - 1] = '\0';
 536                         /* copy  */
 537                         for (n = 0;
 538                              n < nl.ni_namelist_len && n < MAXDNSRCH;
 539                              n++) {
 540                              /* duplicate up to MAXDNSRCH servers */
 541                              char *cp = nl.ni_namelist_val[n];
 542                             _res.dnsrch[n] =
 543                                 strcpy((char *)malloc(strlen(cp) + 1), cp);
 544                         }
 545                         ni_namelist_free(&nl);
 546                         *havesearch = 1;
 547                     }
 548                 }
 549
 550                 /* get list of nameservers */
 551                 status = ni_lookupprop(domain, &dir, "nameserver", &nl);
 552                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 553                     /* copy up to MAXNS servers */
 554                     for (n = 0;
 555                          n < nl.ni_namelist_len && nserv < MAXNS;
 556                          n++) {
 557                         struct in_addr a;
 558
 559                         if (inet_aton(nl.ni_namelist_val[n], &a)) {
 560                             _res.nsaddr_list[nserv].sin_addr = a;
 561                             _res.nsaddr_list[nserv].sin_family = AF_INET;
 562                             _res.nsaddr_list[nserv].sin_port =
 563                                 htons(NAMESERVER_PORT);
 564                             nserv++;
 565                         }
 566                     }
 567                     ni_namelist_free(&nl);
 568                 }
 569
 570                 if (nserv > _res.nscount)
 571                     _res.nscount = nserv;
 572
 573 #ifdef RESOLVSORT
 574                 /* get sort order */
 575                 status = ni_lookupprop(domain, &dir, "sortlist", &nl);
 576                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 577
 578                     /* copy up to MAXRESOLVSORT address/netmask pairs */
 579                     for (n = 0;
 580                          n < nl.ni_namelist_len && nsort < MAXRESOLVSORT;
 581                          n++) {
 582                         char ch;
 583                         char *cp;
 584                         const char *sp;
 585                         struct in_addr a;
 586
 587                         cp = NULL;
 588                         for (sp = sort_mask; *sp; sp++) {
 589                                 char *cp1;
 590                                 cp1 = strchr(nl.ni_namelist_val[n], *sp);
 591                                 if (cp && cp1)
 592                                         cp = (cp < cp1)? cp : cp1;
 593                                 else if (cp1)
 594                                         cp = cp1;
 595                         }
 596                         if (cp != NULL) {
 597                                 ch = *cp;
 598                                 *cp = '\0';
 599                                 break;
 600                         }
 601                         if (inet_aton(nl.ni_namelist_val[n], &a)) {
 602                             _res.sort_list[nsort].addr = a;
 603                             if (*cp && ISSORTMASK(ch)) {
 604                                 *cp++ = ch;
 605                                 if (inet_aton(cp, &a)) {
 606                                     _res.sort_list[nsort].mask = a.s_addr;
 607                                 } else {
 608                                     _res.sort_list[nsort].mask =
 609                                         net_mask(_res.sort_list[nsort].addr);
 610                                 }
 611                             } else {
 612                                 _res.sort_list[nsort].mask =
 613                                     net_mask(_res.sort_list[nsort].addr);
 614                             }
 615                             nsort++;
 616                         }
 617                     }
 618                     ni_namelist_free(&nl);
 619                 }
 620
 621                 _res.nsort = nsort;
 622 #endif
 623
 624                 /* get resolver options */
 625                 status = ni_lookupprop(domain, &dir, "options", &nl);
 626                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 627                     res_setoptions(nl.ni_namelist_val[0], "conf");
 628                     ni_namelist_free(&nl);
 629                 }
 630
 631                 ni_free(domain);
 632                 return(1);      /* using DNS configuration from NetInfo */
 633             }
 634
 635             status = ni_open(domain, "..", &parent);
 636             ni_free(domain);
 637             if (status == NI_OK)
 638                 domain = parent;
 639         }
 640     }
 641     return(0);  /* if not using DNS configuration from NetInfo */
 642 }
 643 #endif  /* NeXT */
 644
 645 u_int
 646 res_randomid()
 647 {
 648         struct timeval now;
 649
 650         __gettimeofday(&now, NULL);
 651         return (0xffff & (now.tv_sec ^ now.tv_usec ^ __getpid()));
 652 }