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 #include "res_hconf.h"
  80
  81 /*-------------------------------------- info about "sortlist" --------------
  82  * Marc Majka           1994/04/16
  83  * Allan Nathanson      1994/10/29 (BIND 4.9.3.x)
  84  *
  85  * NetInfo resolver configuration directory support.
  86  *
  87  * Allow a NetInfo directory to be created in the hierarchy which
  88  * contains the same information as the resolver configuration file.
  89  *
  90  * - The local domain name is stored as the value of the "domain" property.
  91  * - The Internet address(es) of the name server(s) are stored as values
  92  *   of the "nameserver" property.
  93  * - The name server addresses are stored as values of the "nameserver"
  94  *   property.
  95  * - The search list for host-name lookup is stored as values of the
  96  *   "search" property.
  97  * - The sortlist comprised of IP address netmask pairs are stored as
  98  *   values of the "sortlist" property. The IP address and optional netmask
  99  *   should be seperated by a slash (/) or ampersand (&) character.
 100  * - Internal resolver variables can be set from the value of the "options"
 101  *   property.
 102  */
 103 #if defined(NeXT)
 104 #  include <netinfo/ni.h>
 105 #  define NI_PATH_RESCONF "/locations/resolver"
 106 #  define NI_TIMEOUT 10
 107 static int netinfo_res_init __P((int *haveenv, int *havesearch));
 108 #endif
 109
 110 #if defined(USE_OPTIONS_H)
 111 # include "../conf/options.h"
 112 #endif
 113
 114 static void res_setoptions __P((char *, char *));
 115
 116 #ifdef RESOLVSORT
 117 static const char sort_mask[] = "/&";
 118 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
 119 static u_int32_t net_mask __P((struct in_addr));
 120 #endif
 121
 122 #if !defined(isascii)   /* XXX - could be a function */
 123 # define isascii(c) (!(c & 0200))
 124 #endif
 125
 126 /*
 127  * Resolver state default settings.
 128  */
 129
 130 struct __res_state _res;
 131
 132 /*
 133  * Set up default settings.  If the configuration file exist, the values
 134  * there will have precedence.  Otherwise, the server address is set to
 135  * INADDR_ANY and the default domain name comes from the gethostname().
 136  *
 137  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
 138  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
 139  * since it was noted that INADDR_ANY actually meant ``the first interface
 140  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
 141  * it had to be "up" in order for you to reach your own name server.  It
 142  * was later decided that since the recommended practice is to always
 143  * install local static routes through 127.0.0.1 for all your network
 144  * interfaces, that we could solve this problem without a code change.
 145  *
 146  * The configuration file should always be used, since it is the only way
 147  * to specify a default domain.  If you are running a server on your local
 148  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
 149  * in the configuration file.
 150  *
 151  * Return 0 if completes successfully, -1 on error
 152  */
 153 int
 154 res_init()
 155 {
 156         register FILE *fp;
 157         register char *cp, **pp;
 158         register int n;
 159         char buf[BUFSIZ];
 160         int nserv = 0;    /* number of nameserver records read from file */
 161         int haveenv = 0;
 162         int havesearch = 0;
 163 #ifdef RESOLVSORT
 164         int nsort = 0;
 165         char *net;
 166 #endif
 167 #ifndef RFC1535
 168         int dots;
 169 #endif
 170
 171         /*
 172          * These three fields used to be statically initialized.  This made
 173          * it hard to use this code in a shared library.  It is necessary,
 174          * now that we're doing dynamic initialization here, that we preserve
 175          * the old semantics: if an application modifies one of these three
 176          * fields of _res before res_init() is called, res_init() will not
 177          * alter them.  Of course, if an application is setting them to
 178          * _zero_ before calling res_init(), hoping to override what used
 179          * to be the static default, we can't detect it and unexpected results
 180          * will follow.  Zero for any of these fields would make no sense,
 181          * so one can safely assume that the applications were already getting
 182          * unexpected results.
 183          *
 184          * _res.options is tricky since some apps were known to diddle the bits
 185          * before res_init() was first called. We can't replicate that semantic
 186          * with dynamic initialization (they may have turned bits off that are
 187          * set in RES_DEFAULT).  Our solution is to declare such applications
 188          * "broken".  They could fool us by setting RES_INIT but none do (yet).
 189          */
 190         if (!_res.retrans)
 191                 _res.retrans = RES_TIMEOUT;
 192         if (!_res.retry)
 193                 _res.retry = 4;
 194         if (!(_res.options & RES_INIT))
 195                 _res.options = RES_DEFAULT;
 196
 197         /*
 198          * This one used to initialize implicitly to zero, so unless the app
 199          * has set it to something in particular, we can randomize it now.
 200          */
 201         if (!_res.id)
 202                 _res.id = res_randomid();
 203
 204 #ifdef USELOOPBACK
 205         _res.nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
 206 #else
 207         _res.nsaddr.sin_addr.s_addr = INADDR_ANY;
 208 #endif
 209         _res.nsaddr.sin_family = AF_INET;
 210         _res.nsaddr.sin_port = htons(NAMESERVER_PORT);
 211         _res.nscount = 1;
 212         _res.ndots = 1;
 213         _res.pfcode = 0;
 214
 215         /* Allow user to override the local domain definition */
 216         if ((cp = 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(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                     if ((cp = strchr(_res.defdname, '\n')) != NULL)
 289                             *cp = '\0';
 290                     /*
 291                      * Set search list to be blank-separated strings
 292                      * on rest of line.
 293                      */
 294                     cp = _res.defdname;
 295                     pp = _res.dnsrch;
 296                     *pp++ = cp;
 297                     for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
 298                             if (*cp == ' ' || *cp == '\t') {
 299                                     *cp = 0;
 300                                     n = 1;
 301                             } else if (n) {
 302                                     *pp++ = cp;
 303                                     n = 0;
 304                             }
 305                     }
 306                     /* null terminate last domain if there are excess */
 307                     while (*cp != '\0' && *cp != ' ' && *cp != '\t')
 308                             cp++;
 309                     *cp = '\0';
 310                     *pp++ = 0;
 311                     havesearch = 1;
 312                     continue;
 313                 }
 314                 /* read nameservers to query */
 315                 if (MATCH(buf, "nameserver") && nserv < MAXNS) {
 316                     struct in_addr a;
 317
 318                     cp = buf + sizeof("nameserver") - 1;
 319                     while (*cp == ' ' || *cp == '\t')
 320                         cp++;
 321                     if ((*cp != '\0') && (*cp != '\n') && inet_aton(cp, &a)) {
 322                         _res.nsaddr_list[nserv].sin_addr = a;
 323                         _res.nsaddr_list[nserv].sin_family = AF_INET;
 324                         _res.nsaddr_list[nserv].sin_port =
 325                                 htons(NAMESERVER_PORT);
 326                         nserv++;
 327                     }
 328                     continue;
 329                 }
 330 #ifdef RESOLVSORT
 331                 if (MATCH(buf, "sortlist")) {
 332                     struct in_addr a;
 333
 334                     cp = buf + sizeof("sortlist") - 1;
 335                     while (nsort < MAXRESOLVSORT) {
 336                         while (*cp == ' ' || *cp == '\t')
 337                             cp++;
 338                         if (*cp == '\0' || *cp == '\n' || *cp == ';')
 339                             break;
 340                         net = cp;
 341                         while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
 342                                isascii(*cp) && !isspace(*cp))
 343                                 cp++;
 344                         n = *cp;
 345                         *cp = 0;
 346                         if (inet_aton(net, &a)) {
 347                             _res.sort_list[nsort].addr = a;
 348                             if (ISSORTMASK(n)) {
 349                                 *cp++ = n;
 350                                 net = cp;
 351                                 while (*cp && *cp != ';' &&
 352                                         isascii(*cp) && !isspace(*cp))
 353                                     cp++;
 354                                 n = *cp;
 355                                 *cp = 0;
 356                                 if (inet_aton(net, &a)) {
 357                                     _res.sort_list[nsort].mask = a.s_addr;
 358                                 } else {
 359                                     _res.sort_list[nsort].mask =
 360                                         net_mask(_res.sort_list[nsort].addr);
 361                                 }
 362                             } else {
 363                                 _res.sort_list[nsort].mask =
 364                                     net_mask(_res.sort_list[nsort].addr);
 365                             }
 366                             nsort++;
 367                         }
 368                         *cp = n;
 369                     }
 370                     continue;
 371                 }
 372 #endif
 373                 if (MATCH(buf, "options")) {
 374                     res_setoptions(buf + sizeof("options") - 1, "conf");
 375                     continue;
 376                 }
 377             }
 378             if (nserv > 1)
 379                 _res.nscount = nserv;
 380 #ifdef RESOLVSORT
 381             _res.nsort = nsort;
 382 #endif
 383             (void) fclose(fp);
 384         }
 385         if (_res.defdname[0] == 0 &&
 386             gethostname(buf, sizeof(_res.defdname) - 1) == 0 &&
 387             (cp = strchr(buf, '.')) != NULL)
 388                 strcpy(_res.defdname, cp + 1);
 389
 390         /* find components of local domain that might be searched */
 391         if (havesearch == 0) {
 392                 pp = _res.dnsrch;
 393                 *pp++ = _res.defdname;
 394                 *pp = NULL;
 395
 396 #ifndef RFC1535
 397                 dots = 0;
 398                 for (cp = _res.defdname; *cp; cp++)
 399                         dots += (*cp == '.');
 400
 401                 cp = _res.defdname;
 402                 while (pp < _res.dnsrch + MAXDFLSRCH) {
 403                         if (dots < LOCALDOMAINPARTS)
 404                                 break;
 405                         cp = strchr(cp, '.') + 1;    /* we know there is one */
 406                         *pp++ = cp;
 407                         dots--;
 408                 }
 409                 *pp = NULL;
 410 #ifdef DEBUG
 411                 if (_res.options & RES_DEBUG) {
 412                         printf(";; res_init()... default dnsrch list:\n");
 413                         for (pp = _res.dnsrch; *pp; pp++)
 414                                 printf(";;\t%s\n", *pp);
 415                         printf(";;\t..END..\n");
 416                 }
 417 #endif /* DEBUG */
 418 #endif /* !RFC1535 */
 419         }
 420
 421         if ((cp = getenv("RES_OPTIONS")) != NULL)
 422                 res_setoptions(cp, "env");
 423         _res.options |= RES_INIT;
 424
 425         _res_hconf_init ();
 426         return (0);
 427 }
 428
 429 static void
 430 res_setoptions(options, source)
 431         char *options, *source;
 432 {
 433         char *cp = options;
 434         int i;
 435
 436 #ifdef DEBUG
 437         if (_res.options & RES_DEBUG)
 438                 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
 439                        options, source);
 440 #endif
 441         while (*cp) {
 442                 /* skip leading and inner runs of spaces */
 443                 while (*cp == ' ' || *cp == '\t')
 444                         cp++;
 445                 /* search for and process individual options */
 446                 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
 447                         i = atoi(cp + sizeof("ndots:") - 1);
 448                         if (i <= RES_MAXNDOTS)
 449                                 _res.ndots = i;
 450                         else
 451                                 _res.ndots = RES_MAXNDOTS;
 452 #ifdef DEBUG
 453                         if (_res.options & RES_DEBUG)
 454                                 printf(";;\tndots=%d\n", _res.ndots);
 455 #endif
 456                 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
 457 #ifdef DEBUG
 458                         if (!(_res.options & RES_DEBUG)) {
 459                                 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
 460                                        options, source);
 461                                 _res.options |= RES_DEBUG;
 462                         }
 463                         printf(";;\tdebug\n");
 464 #endif
 465                 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
 466                         _res.options |= RES_USE_INET6;
 467                 } else {
 468                         /* XXX - print a warning here? */
 469                 }
 470                 /* skip to next run of spaces */
 471                 while (*cp && *cp != ' ' && *cp != '\t')
 472                         cp++;
 473         }
 474 }
 475
 476 #ifdef RESOLVSORT
 477 /* XXX - should really support CIDR which means explicit masks always. */
 478 static u_int32_t
 479 net_mask(in)            /* XXX - should really use system's version of this */
 480         struct in_addr in;
 481 {
 482         register u_int32_t i = ntohl(in.s_addr);
 483
 484         if (IN_CLASSA(i))
 485                 return (htonl(IN_CLASSA_NET));
 486         else if (IN_CLASSB(i))
 487                 return (htonl(IN_CLASSB_NET));
 488         return (htonl(IN_CLASSC_NET));
 489 }
 490 #endif
 491
 492 #ifdef  NeXT
 493 static int
 494 netinfo_res_init(haveenv, havesearch)
 495         int *haveenv;
 496         int *havesearch;
 497 {
 498     register    int n;
 499     void        *domain, *parent;
 500     ni_id       dir;
 501     ni_status   status;
 502     ni_namelist nl;
 503     int         nserv = 0;
 504 #ifdef RESOLVSORT
 505     int         nsort = 0;
 506 #endif
 507
 508     status = ni_open(NULL, ".", &domain);
 509     if (status == NI_OK) {
 510         ni_setreadtimeout(domain, NI_TIMEOUT);
 511         ni_setabort(domain, 1);
 512
 513         /* climb the NetInfo hierarchy to find a resolver directory */
 514         while (status == NI_OK) {
 515             status = ni_pathsearch(domain, &dir, NI_PATH_RESCONF);
 516             if (status == NI_OK) {
 517             /* found a resolver directory */
 518
 519                 if (*haveenv == 0) {
 520                     /* get the default domain name */
 521                     status = ni_lookupprop(domain, &dir, "domain", &nl);
 522                     if (status == NI_OK && nl.ni_namelist_len > 0) {
 523                         (void)strncpy(_res.defdname,
 524                                       nl.ni_namelist_val[0],
 525                                       sizeof(_res.defdname) - 1);
 526                         _res.defdname[sizeof(_res.defdname) - 1] = '\0';
 527                         ni_namelist_free(&nl);
 528                         *havesearch = 0;
 529                     }
 530
 531                     /* get search list */
 532                     status = ni_lookupprop(domain, &dir, "search", &nl);
 533                     if (status == NI_OK && nl.ni_namelist_len > 0) {
 534                         (void)strncpy(_res.defdname,
 535                                       nl.ni_namelist_val[0],
 536                                       sizeof(_res.defdname) - 1);
 537                         _res.defdname[sizeof(_res.defdname) - 1] = '\0';
 538                         /* copy  */
 539                         for (n = 0;
 540                              n < nl.ni_namelist_len && n < MAXDNSRCH;
 541                              n++) {
 542                              /* duplicate up to MAXDNSRCH servers */
 543                              char *cp = nl.ni_namelist_val[n];
 544                             _res.dnsrch[n] =
 545                                 strcpy((char *)malloc(strlen(cp) + 1), cp);
 546                         }
 547                         ni_namelist_free(&nl);
 548                         *havesearch = 1;
 549                     }
 550                 }
 551
 552                 /* get list of nameservers */
 553                 status = ni_lookupprop(domain, &dir, "nameserver", &nl);
 554                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 555                     /* copy up to MAXNS servers */
 556                     for (n = 0;
 557                          n < nl.ni_namelist_len && nserv < MAXNS;
 558                          n++) {
 559                         struct in_addr a;
 560
 561                         if (inet_aton(nl.ni_namelist_val[n], &a)) {
 562                             _res.nsaddr_list[nserv].sin_addr = a;
 563                             _res.nsaddr_list[nserv].sin_family = AF_INET;
 564                             _res.nsaddr_list[nserv].sin_port =
 565                                 htons(NAMESERVER_PORT);
 566                             nserv++;
 567                         }
 568                     }
 569                     ni_namelist_free(&nl);
 570                 }
 571
 572                 if (nserv > 1)
 573                     _res.nscount = nserv;
 574
 575 #ifdef RESOLVSORT
 576                 /* get sort order */
 577                 status = ni_lookupprop(domain, &dir, "sortlist", &nl);
 578                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 579
 580                     /* copy up to MAXRESOLVSORT address/netmask pairs */
 581                     for (n = 0;
 582                          n < nl.ni_namelist_len && nsort < MAXRESOLVSORT;
 583                          n++) {
 584                         char ch;
 585                         char *cp;
 586                         const char *sp;
 587                         struct in_addr a;
 588
 589                         cp = NULL;
 590                         for (sp = sort_mask; *sp; sp++) {
 591                                 char *cp1;
 592                                 cp1 = strchr(nl.ni_namelist_val[n], *sp);
 593                                 if (cp && cp1)
 594                                         cp = (cp < cp1)? cp : cp1;
 595                                 else if (cp1)
 596                                         cp = cp1;
 597                         }
 598                         if (cp != NULL) {
 599                                 ch = *cp;
 600                                 *cp = '\0';
 601                                 break;
 602                         }
 603                         if (inet_aton(nl.ni_namelist_val[n], &a)) {
 604                             _res.sort_list[nsort].addr = a;
 605                             if (*cp && ISSORTMASK(ch)) {
 606                                 *cp++ = ch;
 607                                 if (inet_aton(cp, &a)) {
 608                                     _res.sort_list[nsort].mask = a.s_addr;
 609                                 } else {
 610                                     _res.sort_list[nsort].mask =
 611                                         net_mask(_res.sort_list[nsort].addr);
 612                                 }
 613                             } else {
 614                                 _res.sort_list[nsort].mask =
 615                                     net_mask(_res.sort_list[nsort].addr);
 616                             }
 617                             nsort++;
 618                         }
 619                     }
 620                     ni_namelist_free(&nl);
 621                 }
 622
 623                 _res.nsort = nsort;
 624 #endif
 625
 626                 /* get resolver options */
 627                 status = ni_lookupprop(domain, &dir, "options", &nl);
 628                 if (status == NI_OK && nl.ni_namelist_len > 0) {
 629                     res_setoptions(nl.ni_namelist_val[0], "conf");
 630                     ni_namelist_free(&nl);
 631                 }
 632
 633                 ni_free(domain);
 634                 return(1);      /* using DNS configuration from NetInfo */
 635             }
 636
 637             status = ni_open(domain, "..", &parent);
 638             ni_free(domain);
 639             if (status == NI_OK)
 640                 domain = parent;
 641         }
 642     }
 643     return(0);  /* if not using DNS configuration from NetInfo */
 644 }
 645 #endif  /* NeXT */
 646
 647 u_int16_t
 648 res_randomid()
 649 {
 650         struct timeval now;
 651
 652         gettimeofday(&now, NULL);
 653         return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
 654 }