usr/src/lib/libresolv2/common/resolv/res_init.c

   1 /*
   2  * Copyright (c) 1996, 2010, Oracle and/or its affiliates. All rights reserved.
   3  */
   4
   5
   6 /*
   7  * Copyright (c) 1985, 1989, 1993
   8  *    The Regents of the University of California.  All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 /*
  40  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  41  *
  42  * Permission to use, copy, modify, and distribute this software for any
  43  * purpose with or without fee is hereby granted, provided that the above
  44  * copyright notice and this permission notice appear in all copies, and that
  45  * the name of Digital Equipment Corporation not be used in advertising or
  46  * publicity pertaining to distribution of the document or software without
  47  * specific, written prior permission.
  48  *
  49  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  50  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  51  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  52  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  53  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  54  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  55  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  56  * SOFTWARE.
  57  */
  58
  59 /*
  60  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  61  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  62  *
  63  * Permission to use, copy, modify, and distribute this software for any
  64  * purpose with or without fee is hereby granted, provided that the above
  65  * copyright notice and this permission notice appear in all copies.
  66  *
  67  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  68  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  69  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  70  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  71  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  72  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  73  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  74  */
  75
  76 #include "port_before.h"
  77
  78 #include <sys/types.h>
  79 #include <sys/param.h>
  80 #include <sys/socket.h>
  81 #include <sys/time.h>
  82
  83 #include <netinet/in.h>
  84 #include <arpa/inet.h>
  85 #include <arpa/nameser.h>
  86
  87 #include <ctype.h>
  88 #include <stdio.h>
  89 #include <stdlib.h>
  90 #include <string.h>
  91 #include <unistd.h>
  92 #include <netdb.h>
  93
  94 #ifndef HAVE_MD5
  95 # include "../dst/md5.h"
  96 #else
  97 # ifdef SOLARIS2
  98 #  include <sys/md5.h>
  99 # endif
 100 #endif
 101 #ifndef _MD5_H_
 102 # define _MD5_H_ 1      /*%< make sure we do not include rsaref md5.h file */
 103 #endif
 104
 105
 106 #include "port_after.h"
 107
 108 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
 109 #include <resolv.h>
 110
 111 /* ISC purposely put port_after.h before <resolv.h> to force in6 stuff
 112  * (above) so we explicitly include port_resolv.h here */
 113 #include "port_resolv.h"
 114
 115 #include "res_private.h"
 116
 117 /*% Options.  Should all be left alone. */
 118 #define RESOLVSORT
 119 #define DEBUG
 120
 121 #ifdef  SUNW_INITCHKIF
 122 #include <net/if.h>
 123 #include <netinet/if_ether.h>
 124 #include <sys/sockio.h>
 125 #define MAXIFS  8192
 126 #endif  /* SUNW_INITCHKIF */
 127
 128 #ifdef SOLARIS2
 129 #include <sys/systeminfo.h>
 130 #endif
 131
 132 static void res_setoptions __P((res_state, const char *, const char *));
 133
 134 #ifdef RESOLVSORT
 135 static const char sort_mask[] = "/&";
 136 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
 137 static u_int32_t net_mask __P((struct in_addr));
 138 #endif
 139
 140 #if !defined(isascii)   /*%< XXX - could be a function */
 141 # define isascii(c) (!(c & 0200))
 142 #endif
 143
 144 /*
 145  * Resolver state default settings.
 146  */
 147
 148 /*%
 149  * Set up default settings.  If the configuration file exist, the values
 150  * there will have precedence.  Otherwise, the server address is set to
 151  * INADDR_ANY and the default domain name comes from the gethostname().
 152  *
 153  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
 154  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
 155  * since it was noted that INADDR_ANY actually meant ``the first interface
 156  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
 157  * it had to be "up" in order for you to reach your own name server.  It
 158  * was later decided that since the recommended practice is to always
 159  * install local static routes through 127.0.0.1 for all your network
 160  * interfaces, that we could solve this problem without a code change.
 161  *
 162  * The configuration file should always be used, since it is the only way
 163  * to specify a default domain.  If you are running a server on your local
 164  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
 165  * in the configuration file.
 166  *
 167  * Return 0 if completes successfully, -1 on error
 168  */
 169 int
 170 res_ninit(res_state statp) {
 171         extern int __res_vinit(res_state, int);
 172         return (__res_vinit(statp, 0));
 173 }
 174
 175 /*% This function has to be reachable by res_data.c but not publically. */
 176 int
 177 __res_vinit(res_state statp, int preinit) {
 178         register FILE *fp;
 179         register char *cp, **pp;
 180         register int n;
 181         char buf[BUFSIZ];
 182         int nserv = 0;    /*%< number of nameserver records read from file */
 183         int haveenv = 0;
 184         int havesearch = 0;
 185 #ifdef RESOLVSORT
 186         int nsort = 0;
 187         char *net;
 188 #endif
 189         int dots;
 190         union res_sockaddr_union u[2];
 191         int maxns = MAXNS;
 192
 193         RES_SET_H_ERRNO(statp, 0);
 194         if (statp->_u._ext.ext != NULL)
 195                 res_ndestroy(statp);
 196
 197         if (!preinit) {
 198                 statp->retrans = RES_TIMEOUT;
 199                 statp->retry = RES_DFLRETRY;
 200                 statp->options = RES_DEFAULT;
 201                 res_rndinit(statp);
 202                 statp->id = res_nrandomid(statp);
 203         }
 204
 205         memset(u, 0, sizeof(u));
 206 #ifdef USELOOPBACK
 207         u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
 208 #else
 209         u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
 210 #endif
 211         u[nserv].sin.sin_family = AF_INET;
 212         u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
 213 #ifdef HAVE_SA_LEN
 214         u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
 215 #endif
 216         nserv++;
 217 #ifdef HAS_INET6_STRUCTS
 218 #ifdef USELOOPBACK
 219         u[nserv].sin6.sin6_addr = in6addr_loopback;
 220 #else
 221         u[nserv].sin6.sin6_addr = in6addr_any;
 222 #endif
 223         u[nserv].sin6.sin6_family = AF_INET6;
 224         u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
 225 #ifdef HAVE_SA_LEN
 226         u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
 227 #endif
 228         nserv++;
 229 #endif
 230         statp->nscount = 0;
 231         statp->ndots = 1;
 232         statp->pfcode = 0;
 233         statp->_vcsock = -1;
 234         statp->_flags = 0;
 235         statp->qhook = NULL;
 236         statp->rhook = NULL;
 237         statp->_u._ext.nscount = 0;
 238         statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
 239         if (statp->_u._ext.ext != NULL) {
 240                 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
 241                 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
 242                 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
 243                 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
 244         } else {
 245                 /*
 246                  * Historically res_init() rarely, if at all, failed.
 247                  * Examples and applications exist which do not check
 248                  * our return code.  Furthermore several applications
 249                  * simply call us to get the systems domainname.  So
 250                  * rather then immediately fail here we store the
 251                  * failure, which is returned later, in h_errno.  And
 252                  * prevent the collection of 'nameserver' information
 253                  * by setting maxns to 0.  Thus applications that fail
 254                  * to check our return code wont be able to make
 255                  * queries anyhow.
 256                  */
 257                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 258                 maxns = 0;
 259         }
 260 #ifdef RESOLVSORT
 261         statp->nsort = 0;
 262 #endif
 263         res_setservers(statp, u, nserv);
 264
 265 #ifdef  SUNW_INITCHKIF
 266 /*
 267  * Short circuit res_init() if no non-loopback interfaces are up. This is
 268  * done to avoid boot delays if "dns" comes before "files" in nsswitch.conf.
 269  * An additional fix has been added to this code, to count all external
 270  * interfaces, which includes the IPv6 interfaces. If no external interfaces
 271  * are found, an additional check is carried out to determine if any deprecated
 272  * interfaces are up.
 273  */
 274         {
 275                 int s;
 276                 struct lifnum lifn;
 277
 278                 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 279                         perror("res_init: socket");
 280                         goto freedata;
 281                 }
 282                 lifn.lifn_family = AF_UNSPEC;
 283                 lifn.lifn_flags = LIFC_EXTERNAL_SOURCE;
 284                 if (ioctl(s, SIOCGLIFNUM, (char *)&lifn) < 0) {
 285                         close(s);
 286                         goto freedata;
 287                 }
 288                 if (lifn.lifn_count == 0) {
 289                         /*
 290                          * Check if there are any deprecated interfaces up
 291                          */
 292                         struct lifconf lifc;
 293                         uchar_t *buf;
 294                         int buflen, i, int_up = 0;
 295
 296                         lifn.lifn_flags = 0;
 297                         if ((ioctl(s, SIOCGLIFNUM, (char *)&lifn) < 0) ||
 298                                         (lifn.lifn_count < 1)) {
 299                                 close(s);
 300                                 goto freedata;
 301                         }
 302
 303                         buflen = lifn.lifn_count * sizeof (struct lifreq);
 304                         buf = (uchar_t *)malloc(buflen);
 305                         if (buf == NULL) {
 306                                 close(s);
 307                                 goto freedata;
 308                         }
 309
 310                         lifc.lifc_family = AF_UNSPEC;
 311                         lifc.lifc_flags = 0;
 312                         lifc.lifc_len = buflen;
 313                         lifc.lifc_lifcu.lifcu_buf = (caddr_t)buf;
 314                         if (ioctl(s, SIOCGLIFCONF, (char *)&lifc) < 0) {
 315                                 close(s);
 316                                 free(buf);
 317                                 goto freedata;
 318                         }
 319
 320                         for (i = 0; i < lifn.lifn_count; ++i) {
 321                                 struct lifreq *lreqp, lreq;
 322
 323                                 lreqp = (struct lifreq *)&lifc.lifc_req[i];
 324                                 strlcpy(lreq.lifr_name, lreqp->lifr_name,
 325                                                 sizeof (lreq.lifr_name));
 326                                 if (ioctl(s, SIOCGLIFFLAGS, &lreq) < 0) {
 327                                         close(s);
 328                                         free(buf);
 329                                         goto freedata;
 330                                 }
 331                                 if ((lreq.lifr_flags & IFF_UP) &&
 332                                         !(lreq.lifr_flags & IFF_NOLOCAL) &&
 333                                         !(lreq.lifr_flags & IFF_NOXMIT) &&
 334                                         !(lreq.lifr_flags & IFF_LOOPBACK)) {
 335                                         int_up = 1;
 336                                         break;
 337                                 }
 338                         }
 339                         free(buf);
 340
 341                         if (!int_up) {
 342                                 close(s);
 343                                 goto freedata;
 344                         }
 345                 }
 346                 close(s);
 347         }
 348 #endif  /* SUNW_INITCHKIF */
 349
 350 #ifdef  SOLARIS2
 351         /*
 352          * The old libresolv derived the defaultdomain from NIS/NIS+.
 353          * We want to keep this behaviour
 354          */
 355         {
 356                 char buf[sizeof(statp->defdname)], *cp;
 357                 int ret;
 358
 359                 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
 360                         (unsigned int)ret <= sizeof(buf)) {
 361                         if (buf[0] == '+')
 362                                 buf[0] = '.';
 363                         cp = strchr(buf, '.');
 364                         cp = (cp == NULL) ? buf : (cp + 1);
 365                         strncpy(statp->defdname, cp,
 366                                 sizeof(statp->defdname) - 1);
 367                         statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 368                 }
 369         }
 370 #endif  /* SOLARIS2 */
 371
 372         /* Allow user to override the local domain definition */
 373         if ((cp = getenv("LOCALDOMAIN")) != NULL) {
 374                 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 375                 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 376                 haveenv++;
 377
 378                 /*
 379                  * Set search list to be blank-separated strings
 380                  * from rest of env value.  Permits users of LOCALDOMAIN
 381                  * to still have a search list, and anyone to set the
 382                  * one that they want to use as an individual (even more
 383                  * important now that the rfc1535 stuff restricts searches)
 384                  */
 385                 cp = statp->defdname;
 386                 pp = statp->dnsrch;
 387                 *pp++ = cp;
 388                 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
 389                         if (*cp == '\n')        /*%< silly backwards compat */
 390                                 break;
 391                         else if (*cp == ' ' || *cp == '\t') {
 392                                 *cp = 0;
 393                                 n = 1;
 394                         } else if (n) {
 395                                 *pp++ = cp;
 396                                 n = 0;
 397                                 havesearch = 1;
 398                         }
 399                 }
 400                 /* null terminate last domain if there are excess */
 401                 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
 402                         cp++;
 403                 *cp = '\0';
 404                 *pp++ = 0;
 405         }
 406
 407 #define MATCH(line, name) \
 408         (!strncmp(line, name, sizeof(name) - 1) && \
 409         (line[sizeof(name) - 1] == ' ' || \
 410          line[sizeof(name) - 1] == '\t'))
 411
 412         nserv = 0;
 413         if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
 414             /* read the config file */
 415             while (fgets(buf, sizeof(buf), fp) != NULL) {
 416                 /* skip comments */
 417                 if (*buf == ';' || *buf == '#')
 418                         continue;
 419                 /* read default domain name */
 420                 if (MATCH(buf, "domain")) {
 421                     if (haveenv)        /*%< skip if have from environ */
 422                             continue;
 423                     cp = buf + sizeof("domain") - 1;
 424                     while (*cp == ' ' || *cp == '\t')
 425                             cp++;
 426                     if ((*cp == '\0') || (*cp == '\n'))
 427                             continue;
 428                     strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 429                     statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 430                     if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
 431                             *cp = '\0';
 432                     havesearch = 0;
 433                     continue;
 434                 }
 435                 /* set search list */
 436                 if (MATCH(buf, "search")) {
 437                     if (haveenv)        /*%< skip if have from environ */
 438                             continue;
 439                     cp = buf + sizeof("search") - 1;
 440                     while (*cp == ' ' || *cp == '\t')
 441                             cp++;
 442                     if ((*cp == '\0') || (*cp == '\n'))
 443                             continue;
 444                     strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 445                     statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 446                     if ((cp = strchr(statp->defdname, '\n')) != NULL)
 447                             *cp = '\0';
 448                     /*
 449                      * Set search list to be blank-separated strings
 450                      * on rest of line.
 451                      */
 452                     cp = statp->defdname;
 453                     pp = statp->dnsrch;
 454                     *pp++ = cp;
 455                     for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
 456                             if (*cp == ' ' || *cp == '\t') {
 457                                     *cp = 0;
 458                                     n = 1;
 459                             } else if (n) {
 460                                     *pp++ = cp;
 461                                     n = 0;
 462                             }
 463                     }
 464                     /* null terminate last domain if there are excess */
 465                     while (*cp != '\0' && *cp != ' ' && *cp != '\t')
 466                             cp++;
 467                     *cp = '\0';
 468                     *pp++ = 0;
 469                     havesearch = 1;
 470                     continue;
 471                 }
 472                 /* read nameservers to query */
 473                 if (MATCH(buf, "nameserver") && nserv < maxns) {
 474                     struct addrinfo hints, *ai;
 475                     char sbuf[NI_MAXSERV];
 476                     const size_t minsiz =
 477                         sizeof(statp->_u._ext.ext->nsaddrs[0]);
 478
 479                     cp = buf + sizeof("nameserver") - 1;
 480                     while (*cp == ' ' || *cp == '\t')
 481                         cp++;
 482                     cp[strcspn(cp, ";# \t\n")] = '\0';
 483                     if ((*cp != '\0') && (*cp != '\n')) {
 484                         memset(&hints, 0, sizeof(hints));
 485                         hints.ai_family = PF_UNSPEC;
 486                         hints.ai_socktype = SOCK_DGRAM; /*dummy*/
 487                         hints.ai_flags = AI_NUMERICHOST;
 488                         sprintf(sbuf, "%u", NAMESERVER_PORT);
 489                         if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
 490                             ai->ai_addrlen <= minsiz) {
 491                             if (statp->_u._ext.ext != NULL) {
 492                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 493                                     ai->ai_addr, ai->ai_addrlen);
 494                             }
 495                             if (ai->ai_addrlen <=
 496                                 sizeof(statp->nsaddr_list[nserv])) {
 497                                 memcpy(&statp->nsaddr_list[nserv],
 498                                     ai->ai_addr, ai->ai_addrlen);
 499                             } else
 500                                 statp->nsaddr_list[nserv].sin_family = 0;
 501                             freeaddrinfo(ai);
 502                             nserv++;
 503                         }
 504                     }
 505                     continue;
 506                 }
 507 #ifdef RESOLVSORT
 508                 if (MATCH(buf, "sortlist")) {
 509                     struct in_addr a;
 510
 511                     cp = buf + sizeof("sortlist") - 1;
 512                     while (nsort < MAXRESOLVSORT) {
 513                         while (*cp == ' ' || *cp == '\t')
 514                             cp++;
 515                         if (*cp == '\0' || *cp == '\n' || *cp == ';')
 516                             break;
 517                         net = cp;
 518                         while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
 519                                isascii(*cp) && !isspace((unsigned char)*cp))
 520                                 cp++;
 521                         n = *cp;
 522                         *cp = 0;
 523                         if (inet_aton(net, &a)) {
 524                             statp->sort_list[nsort].addr = a;
 525                             if (ISSORTMASK(n)) {
 526                                 *cp++ = n;
 527                                 net = cp;
 528                                 while (*cp && *cp != ';' &&
 529                                         isascii(*cp) &&
 530                                         !isspace((unsigned char)*cp))
 531                                     cp++;
 532                                 n = *cp;
 533                                 *cp = 0;
 534                                 if (inet_aton(net, &a)) {
 535                                     statp->sort_list[nsort].mask = a.s_addr;
 536                                 } else {
 537                                     statp->sort_list[nsort].mask =
 538                                         net_mask(statp->sort_list[nsort].addr);
 539                                 }
 540                             } else {
 541                                 statp->sort_list[nsort].mask =
 542                                     net_mask(statp->sort_list[nsort].addr);
 543                             }
 544                             nsort++;
 545                         }
 546                         *cp = n;
 547                     }
 548                     continue;
 549                 }
 550 #endif
 551                 if (MATCH(buf, "options")) {
 552                     res_setoptions(statp, buf + sizeof("options") - 1, "conf");
 553                     continue;
 554                 }
 555             }
 556             if (nserv > 0)
 557                 statp->nscount = nserv;
 558 #ifdef RESOLVSORT
 559             statp->nsort = nsort;
 560 #endif
 561             (void) fclose(fp);
 562         }
 563 /*
 564  * Last chance to get a nameserver.  This should not normally
 565  * be necessary
 566  */
 567 #ifdef NO_RESOLV_CONF
 568         if(nserv == 0)
 569                 nserv = get_nameservers(statp);
 570 #endif
 571
 572         if (statp->defdname[0] == 0 &&
 573             gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
 574             (cp = strchr(buf, '.')) != NULL)
 575                 strcpy(statp->defdname, cp + 1);
 576
 577         /* find components of local domain that might be searched */
 578         if (havesearch == 0) {
 579                 pp = statp->dnsrch;
 580                 *pp++ = statp->defdname;
 581                 *pp = NULL;
 582
 583                 dots = 0;
 584                 for (cp = statp->defdname; *cp; cp++)
 585                         dots += (*cp == '.');
 586
 587                 cp = statp->defdname;
 588                 while (pp < statp->dnsrch + MAXDFLSRCH) {
 589                         if (dots < LOCALDOMAINPARTS)
 590                                 break;
 591                         cp = strchr(cp, '.') + 1;    /*%< we know there is one */
 592                         *pp++ = cp;
 593                         dots--;
 594                 }
 595                 *pp = NULL;
 596 #ifdef DEBUG
 597                 if (statp->options & RES_DEBUG) {
 598                         printf(";; res_init()... default dnsrch list:\n");
 599                         for (pp = statp->dnsrch; *pp; pp++)
 600                                 printf(";;\t%s\n", *pp);
 601                         printf(";;\t..END..\n");
 602                 }
 603 #endif
 604         }
 605
 606         if ((cp = getenv("RES_OPTIONS")) != NULL)
 607                 res_setoptions(statp, cp, "env");
 608         statp->options |= RES_INIT;
 609         return (statp->res_h_errno);
 610 #ifdef  SUNW_INITCHKIF
 611 freedata:
 612         RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 613         if (statp->_u._ext.ext != NULL) {
 614                 free(statp->_u._ext.ext);
 615                 statp->_u._ext.ext = NULL;
 616         }
 617         return (-1);
 618 #endif  /* SUNW_INITCHKIF */
 619
 620 }
 621
 622 static void
 623 res_setoptions(res_state statp, const char *options, const char *source)
 624 {
 625         const char *cp = options;
 626         int i;
 627         struct __res_state_ext *ext = statp->_u._ext.ext;
 628
 629 #ifdef DEBUG
 630         if (statp->options & RES_DEBUG)
 631                 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
 632                        options, source);
 633 #endif
 634         while (*cp) {
 635                 /* skip leading and inner runs of spaces */
 636                 while (*cp == ' ' || *cp == '\t')
 637                         cp++;
 638                 /* search for and process individual options */
 639                 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
 640                         i = atoi(cp + sizeof("ndots:") - 1);
 641                         if (i <= RES_MAXNDOTS)
 642                                 statp->ndots = i;
 643                         else
 644                                 statp->ndots = RES_MAXNDOTS;
 645 #ifdef DEBUG
 646                         if (statp->options & RES_DEBUG)
 647                                 printf(";;\tndots=%d\n", statp->ndots);
 648 #endif
 649                 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
 650                         i = atoi(cp + sizeof("timeout:") - 1);
 651                         if (i <= RES_MAXRETRANS)
 652                                 statp->retrans = i;
 653                         else
 654                                 statp->retrans = RES_MAXRETRANS;
 655 #ifdef DEBUG
 656                         if (statp->options & RES_DEBUG)
 657                                 printf(";;\ttimeout=%d\n", statp->retrans);
 658 #endif
 659 #ifdef  SOLARIS2
 660                 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
 661                         /*
 662                          * For backward compatibility, 'retrans' is
 663                          * supported as an alias for 'timeout', though
 664                          * without an imposed maximum.
 665                          */
 666                         statp->retrans = atoi(cp + sizeof("retrans:") - 1);
 667                 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
 668                         /*
 669                          * For backward compatibility, 'retry' is
 670                          * supported as an alias for 'attempts', though
 671                          * without an imposed maximum.
 672                          */
 673                         statp->retry = atoi(cp + sizeof("retry:") - 1);
 674 #endif  /* SOLARIS2 */
 675                 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
 676                         i = atoi(cp + sizeof("attempts:") - 1);
 677                         if (i <= RES_MAXRETRY)
 678                                 statp->retry = i;
 679                         else
 680                                 statp->retry = RES_MAXRETRY;
 681 #ifdef DEBUG
 682                         if (statp->options & RES_DEBUG)
 683                                 printf(";;\tattempts=%d\n", statp->retry);
 684 #endif
 685                 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
 686 #ifdef DEBUG
 687                         if (!(statp->options & RES_DEBUG)) {
 688                                 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
 689                                        options, source);
 690                                 statp->options |= RES_DEBUG;
 691                         }
 692                         printf(";;\tdebug\n");
 693 #endif
 694                 } else if (!strncmp(cp, "no_tld_query",
 695                                     sizeof("no_tld_query") - 1) ||
 696                            !strncmp(cp, "no-tld-query",
 697                                     sizeof("no-tld-query") - 1)) {
 698                         statp->options |= RES_NOTLDQUERY;
 699                 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
 700                         statp->options |= RES_USE_INET6;
 701                 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
 702                         statp->options |= RES_ROTATE;
 703                 } else if (!strncmp(cp, "no-check-names",
 704                                     sizeof("no-check-names") - 1)) {
 705                         statp->options |= RES_NOCHECKNAME;
 706                 }
 707 #ifdef RES_USE_EDNS0
 708                 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
 709                         statp->options |= RES_USE_EDNS0;
 710                 }
 711 #endif
 712                 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
 713                         statp->options |= RES_USE_DNAME;
 714                 }
 715                 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
 716                         if (ext == NULL)
 717                                 goto skip;
 718                         cp += sizeof("nibble:") - 1;
 719                         i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
 720                         strncpy(ext->nsuffix, cp, i);
 721                         ext->nsuffix[i] = '\0';
 722                 }
 723                 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
 724                         if (ext == NULL)
 725                                 goto skip;
 726                         cp += sizeof("nibble2:") - 1;
 727                         i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
 728                         strncpy(ext->nsuffix2, cp, i);
 729                         ext->nsuffix2[i] = '\0';
 730                 }
 731                 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
 732                         cp += sizeof("v6revmode:") - 1;
 733                         /* "nibble" and "bitstring" used to be valid */
 734                         if (!strncmp(cp, "single", sizeof("single") - 1)) {
 735                                 statp->options |= RES_NO_NIBBLE2;
 736                         } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
 737                                 statp->options &=
 738                                          ~RES_NO_NIBBLE2;
 739                         }
 740                 }
 741                 else {
 742                         /* XXX - print a warning here? */
 743                 }
 744    skip:
 745                 /* skip to next run of spaces */
 746                 while (*cp && *cp != ' ' && *cp != '\t')
 747                         cp++;
 748         }
 749 }
 750
 751 #ifdef RESOLVSORT
 752 /* XXX - should really support CIDR which means explicit masks always. */
 753 static u_int32_t
 754 net_mask(in)            /*!< XXX - should really use system's version of this  */
 755         struct in_addr in;
 756 {
 757         register u_int32_t i = ntohl(in.s_addr);
 758
 759         if (IN_CLASSA(i))
 760                 return (htonl(IN_CLASSA_NET));
 761         else if (IN_CLASSB(i))
 762                 return (htonl(IN_CLASSB_NET));
 763         return (htonl(IN_CLASSC_NET));
 764 }
 765 #endif
 766
 767 void
 768 res_rndinit(res_state statp)
 769 {
 770         struct timeval now;
 771         u_int32_t u32;
 772         u_int16_t u16;
 773
 774         gettimeofday(&now, NULL);
 775         u32 = now.tv_sec;
 776         memcpy(statp->_u._ext._rnd, &u32, 4);
 777         u32 = now.tv_usec;
 778         memcpy(statp->_u._ext._rnd + 4, &u32, 4);
 779         u32 += now.tv_sec;
 780         memcpy(statp->_u._ext._rnd + 8, &u32, 4);
 781         u16 = getpid();
 782         memcpy(statp->_u._ext._rnd + 12, &u16, 2);
 783
 784 }
 785
 786 u_int
 787 res_nrandomid(res_state statp) {
 788         struct timeval now;
 789         u_int16_t u16;
 790         MD5_CTX ctx;
 791
 792         gettimeofday(&now, NULL);
 793         u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
 794
 795         memcpy(statp->_u._ext._rnd + 14, &u16, 2);
 796 #ifndef HAVE_MD5
 797         MD5_Init(&ctx);
 798         MD5_Update(&ctx, statp->_u._ext._rnd, 16);
 799         MD5_Final(statp->_u._ext._rnd, &ctx);
 800 #else
 801         MD5Init(&ctx);
 802         MD5Update(&ctx, statp->_u._ext._rnd, 16);
 803         MD5Final(statp->_u._ext._rnd, &ctx);
 804 #endif
 805         memcpy(&u16, statp->_u._ext._rnd + 14, 2);
 806         return ((u_int) u16);
 807 }
 808
 809 /*%
 810  * This routine is for closing the socket if a virtual circuit is used and
 811  * the program wants to close it.  This provides support for endhostent()
 812  * which expects to close the socket.
 813  *
 814  * This routine is not expected to be user visible.
 815  */
 816 void
 817 res_nclose(res_state statp) {
 818         int ns;
 819
 820         if (statp->_vcsock >= 0) {
 821                 (void) close(statp->_vcsock);
 822                 statp->_vcsock = -1;
 823                 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
 824         }
 825         for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
 826                 if (statp->_u._ext.nssocks[ns] != -1) {
 827                         (void) close(statp->_u._ext.nssocks[ns]);
 828                         statp->_u._ext.nssocks[ns] = -1;
 829                 }
 830         }
 831 }
 832
 833 void
 834 res_ndestroy(res_state statp) {
 835         res_nclose(statp);
 836         free(statp->_u._ext.ext);
 837         statp->options &= ~RES_INIT;
 838         statp->_u._ext.ext = NULL;
 839 }
 840
 841 const char *
 842 res_get_nibblesuffix(res_state statp) {
 843         if (statp->_u._ext.ext)
 844                 return (statp->_u._ext.ext->nsuffix);
 845         return ("ip6.arpa");
 846 }
 847
 848 const char *
 849 res_get_nibblesuffix2(res_state statp) {
 850         if (statp->_u._ext.ext)
 851                 return (statp->_u._ext.ext->nsuffix2);
 852         return ("ip6.int");
 853 }
 854
 855 void
 856 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
 857         int i, nserv;
 858         size_t size;
 859
 860         /* close open servers */
 861         res_nclose(statp);
 862
 863         /* cause rtt times to be forgotten */
 864         statp->_u._ext.nscount = 0;
 865
 866         nserv = 0;
 867         for (i = 0; i < cnt && nserv < MAXNS; i++) {
 868                 switch (set->sin.sin_family) {
 869                 case AF_INET:
 870                         size = sizeof(set->sin);
 871                         if (statp->_u._ext.ext)
 872                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 873                                         &set->sin, size);
 874                         if (size <= sizeof(statp->nsaddr_list[nserv]))
 875                                 memcpy(&statp->nsaddr_list[nserv],
 876                                         &set->sin, size);
 877                         else
 878                                 statp->nsaddr_list[nserv].sin_family = 0;
 879                         nserv++;
 880                         break;
 881
 882 #ifdef HAS_INET6_STRUCTS
 883                 case AF_INET6:
 884                         size = sizeof(set->sin6);
 885                         if (statp->_u._ext.ext)
 886                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 887                                         &set->sin6, size);
 888                         if (size <= sizeof(statp->nsaddr_list[nserv]))
 889                                 memcpy(&statp->nsaddr_list[nserv],
 890                                         &set->sin6, size);
 891                         else
 892                                 statp->nsaddr_list[nserv].sin_family = 0;
 893                         nserv++;
 894                         break;
 895 #endif
 896
 897                 default:
 898                         break;
 899                 }
 900                 set++;
 901         }
 902         statp->nscount = nserv;
 903
 904 }
 905
 906 int
 907 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
 908         int i;
 909         size_t size;
 910         u_int16_t family;
 911
 912         for (i = 0; i < statp->nscount && i < cnt; i++) {
 913                 if (statp->_u._ext.ext)
 914                         family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
 915                 else
 916                         family = statp->nsaddr_list[i].sin_family;
 917
 918                 switch (family) {
 919                 case AF_INET:
 920                         size = sizeof(set->sin);
 921                         if (statp->_u._ext.ext)
 922                                 memcpy(&set->sin,
 923                                        &statp->_u._ext.ext->nsaddrs[i],
 924                                        size);
 925                         else
 926                                 memcpy(&set->sin, &statp->nsaddr_list[i],
 927                                        size);
 928                         break;
 929
 930 #ifdef HAS_INET6_STRUCTS
 931                 case AF_INET6:
 932                         size = sizeof(set->sin6);
 933                         if (statp->_u._ext.ext)
 934                                 memcpy(&set->sin6,
 935                                        &statp->_u._ext.ext->nsaddrs[i],
 936                                        size);
 937                         else
 938                                 memcpy(&set->sin6, &statp->nsaddr_list[i],
 939                                        size);
 940                         break;
 941 #endif
 942
 943                 default:
 944                         set->sin.sin_family = 0;
 945                         break;
 946                 }
 947                 set++;
 948         }
 949         return (statp->nscount);
 950 }
 951
 952 /*! \file */