src/kits/network/netresolv/resolv/res_init.c

   1 /*      $NetBSD: res_init.c,v 1.30 2015/02/24 17:56:20 christos Exp $   */
   2
   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
  36 /*
  37  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  38  *
  39  * Permission to use, copy, modify, and distribute this software for any
  40  * purpose with or without fee is hereby granted, provided that the above
  41  * copyright notice and this permission notice appear in all copies, and that
  42  * the name of Digital Equipment Corporation not be used in advertising or
  43  * publicity pertaining to distribution of the document or software without
  44  * specific, written prior permission.
  45  *
  46  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  47  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  48  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  49  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  50  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  51  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  52  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  53  * SOFTWARE.
  54  */
  55
  56 /*
  57  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  58  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  59  *
  60  * Permission to use, copy, modify, and distribute this software for any
  61  * purpose with or without fee is hereby granted, provided that the above
  62  * copyright notice and this permission notice appear in all copies.
  63  *
  64  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  65  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  66  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  67  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  68  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  69  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  70  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  71  */
  72
  73 #include "port_before.h"
  74
  75 #include <sys/types.h>
  76 #include <sys/param.h>
  77 #include <sys/socket.h>
  78 #include <sys/time.h>
  79
  80 #include <netinet/in.h>
  81 #include <arpa/inet.h>
  82 #include <arpa/nameser.h>
  83
  84 #include <ctype.h>
  85 #include <stdio.h>
  86 #include <stdlib.h>
  87 #include <string.h>
  88 #include <unistd.h>
  89 #include <fcntl.h>
  90 #include <netdb.h>
  91
  92 #ifndef HAVE_MD5
  93 # include "../dst/md5.h"
  94 #else
  95 # ifdef SOLARIS2
  96 #  include <sys/md5.h>
  97 # endif
  98 #endif
  99 #ifndef _MD5_H_
 100 # define _MD5_H_ 1      /*%< make sure we do not include rsaref md5.h file */
 101 #endif
 102
 103 #include "port_after.h"
 104
 105 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
 106 #include <resolv.h>
 107
 108 #include <FindDirectory.h>
 109
 110 #include "res_private.h"
 111
 112 #define RESOLVSORT
 113 /*% Options. Should all be left alone. */
 114 #ifndef DEBUG
 115 //#define DEBUG
 116 #endif
 117
 118 #ifdef SOLARIS2
 119 #include <sys/systeminfo.h>
 120 #endif
 121
 122 static void res_setoptions(res_state, const char *, const char *);
 123
 124 #ifdef RESOLVSORT
 125 static const char sort_mask[] = "/&";
 126 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
 127 static uint32_t net_mask __P((struct in_addr));
 128 #endif
 129
 130 #if !defined(isascii)   /*%< XXX - could be a function */
 131 # define isascii(c) (!(c & 0200))
 132 #endif
 133
 134 static const struct timespec ts = { 0, 0 };
 135
 136 /*
 137  * Resolver state default settings.
 138  */
 139
 140 /*%
 141  * Set up default settings.  If the configuration file exist, the values
 142  * there will have precedence.  Otherwise, the server address is set to
 143  * INADDR_ANY and the default domain name comes from the gethostname().
 144  *
 145  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
 146  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
 147  * since it was noted that INADDR_ANY actually meant ``the first interface
 148  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
 149  * it had to be "up" in order for you to reach your own name server.  It
 150  * was later decided that since the recommended practice is to always
 151  * install local static routes through 127.0.0.1 for all your network
 152  * interfaces, that we could solve this problem without a code change.
 153  *
 154  * The configuration file should always be used, since it is the only way
 155  * to specify a default domain.  If you are running a server on your local
 156  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
 157  * in the configuration file.
 158  *
 159  * Return 0 if completes successfully, -1 on error
 160  */
 161 int
 162 res_ninit(res_state statp) {
 163         return (__res_vinit(statp, 0));
 164 }
 165
 166 /*% This function has to be reachable by res_data.c but not publically. */
 167 int
 168 __res_vinit(res_state statp, int preinit) {
 169         register FILE *fp;
 170         register char *cp, **pp;
 171         register int n;
 172         char path[PATH_MAX];
 173         char buf[BUFSIZ];
 174         int nserv = 0;    /*%< number of nameserver records read from file */
 175         int haveenv = 0;
 176         int havesearch = 0;
 177 #ifdef RESOLVSORT
 178         int nsort = 0;
 179         char *net;
 180 #endif
 181         int dots;
 182         union res_sockaddr_union u[2];
 183         int maxns = MAXNS;
 184
 185         RES_SET_H_ERRNO(statp, 0);
 186
 187         if ((statp->options & RES_INIT) != 0U)
 188                 res_ndestroy(statp);
 189
 190         if (!preinit) {
 191                 statp->retrans = RES_TIMEOUT;
 192                 statp->retry = RES_DFLRETRY;
 193                 statp->options = RES_DEFAULT;
 194         }
 195         res_rndinit(statp);
 196         statp->id = res_nrandomid(statp);
 197
 198         memset(u, 0, sizeof(u));
 199 #ifdef USELOOPBACK
 200         u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
 201 #else
 202         u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
 203 #endif
 204         u[nserv].sin.sin_family = AF_INET;
 205         u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
 206 #ifdef HAVE_SA_LEN
 207         u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
 208 #endif
 209         nserv++;
 210 #ifdef HAS_INET6_STRUCTS
 211 #ifdef USELOOPBACK
 212         u[nserv].sin6.sin6_addr = in6addr_loopback;
 213 #else
 214         u[nserv].sin6.sin6_addr = in6addr_any;
 215 #endif
 216         u[nserv].sin6.sin6_family = AF_INET6;
 217         u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
 218 #ifdef HAVE_SA_LEN
 219         u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
 220 #endif
 221         nserv++;
 222 #endif
 223         statp->nscount = 0;
 224         statp->ndots = 1;
 225         statp->pfcode = 0;
 226         statp->_vcsock = -1;
 227         statp->_flags = 0;
 228         statp->qhook = NULL;
 229         statp->rhook = NULL;
 230         statp->_u._ext.nscount = 0;
 231         statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
 232         if (statp->_u._ext.ext != NULL) {
 233                 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
 234                 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
 235                 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
 236                 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
 237         } else {
 238                 /*
 239                  * Historically res_init() rarely, if at all, failed.
 240                  * Examples and applications exist which do not check
 241                  * our return code.  Furthermore several applications
 242                  * simply call us to get the systems domainname.  So
 243                  * rather than immediately fail here we store the
 244                  * failure, which is returned later, in h_errno.  And
 245                  * prevent the collection of 'nameserver' information
 246                  * by setting maxns to 0.  Thus applications that fail
 247                  * to check our return code wont be able to make
 248                  * queries anyhow.
 249                  */
 250                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 251                 maxns = 0;
 252         }
 253 #ifdef RESOLVSORT
 254         statp->nsort = 0;
 255 #endif
 256         res_setservers(statp, u, nserv);
 257
 258 #ifdef  SOLARIS2
 259         /*
 260          * The old libresolv derived the defaultdomain from NIS/NIS+.
 261          * We want to keep this behaviour
 262          */
 263         {
 264                 char buf[sizeof(statp->defdname)], *cp;
 265                 int ret;
 266
 267                 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
 268                         (unsigned int)ret <= sizeof(buf)) {
 269                         if (buf[0] == '+')
 270                                 buf[0] = '.';
 271                         cp = strchr(buf, '.');
 272                         cp = (cp == NULL) ? buf : (cp + 1);
 273                         (void)strlcpy(statp->defdname, cp,
 274                             sizeof(statp->defdname));
 275                 }
 276         }
 277 #endif  /* SOLARIS2 */
 278
 279         /* Allow user to override the local domain definition */
 280         if ((cp = getenv("LOCALDOMAIN")) != NULL) {
 281                 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 282                 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 283                 haveenv++;
 284
 285                 /*
 286                  * Set search list to be blank-separated strings
 287                  * from rest of env value.  Permits users of LOCALDOMAIN
 288                  * to still have a search list, and anyone to set the
 289                  * one that they want to use as an individual (even more
 290                  * important now that the rfc1535 stuff restricts searches)
 291                  */
 292                 cp = statp->defdname;
 293                 pp = statp->dnsrch;
 294                 *pp++ = cp;
 295                 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
 296                         if (*cp == '\n')        /*%< silly backwards compat */
 297                                 break;
 298                         else if (*cp == ' ' || *cp == '\t') {
 299                                 *cp = 0;
 300                                 n = 1;
 301                         } else if (n) {
 302                                 *pp++ = cp;
 303                                 n = 0;
 304                                 havesearch = 1;
 305                         }
 306                 }
 307                 /* null terminate last domain if there are excess */
 308                 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
 309                         cp++;
 310                 *cp = '\0';
 311                 *pp++ = 0;
 312         }
 313
 314 #define MATCH(line, name) \
 315         (!strncmp(line, name, sizeof(name) - 1) && \
 316         (line[sizeof(name) - 1] == ' ' || \
 317          line[sizeof(name) - 1] == '\t'))
 318
 319         if (find_directory(B_SYSTEM_SETTINGS_DIRECTORY, -1, false, path,
 320                         sizeof(path)) == B_OK)
 321                 strlcat(path, "/network/resolv.conf", sizeof(path));
 322
 323         nserv = 0;
 324         if ((fp = fopen(path, "re")) != NULL) {
 325             /* read the config file */
 326             while (fgets(buf, (int)sizeof(buf), fp) != NULL) {
 327                 /* skip comments */
 328                 if (*buf == ';' || *buf == '#')
 329                         continue;
 330                 /* read default domain name */
 331                 if (MATCH(buf, "domain")) {
 332                     if (haveenv)        /*%< skip if have from environ */
 333                             continue;
 334                     cp = buf + sizeof("domain") - 1;
 335                     while (*cp == ' ' || *cp == '\t')
 336                             cp++;
 337                     if ((*cp == '\0') || (*cp == '\n'))
 338                             continue;
 339                     strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 340                     statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 341                     if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
 342                             *cp = '\0';
 343                     havesearch = 0;
 344                     continue;
 345                 }
 346                 /* set search list */
 347                 if (MATCH(buf, "search")) {
 348                     if (haveenv)        /*%< skip if have from environ */
 349                             continue;
 350                     cp = buf + sizeof("search") - 1;
 351                     while (*cp == ' ' || *cp == '\t')
 352                             cp++;
 353                     if ((*cp == '\0') || (*cp == '\n'))
 354                             continue;
 355                     strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 356                     statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 357                     if ((cp = strchr(statp->defdname, '\n')) != NULL)
 358                             *cp = '\0';
 359                     /*
 360                      * Set search list to be blank-separated strings
 361                      * on rest of line.
 362                      */
 363                     cp = statp->defdname;
 364                     pp = statp->dnsrch;
 365                     *pp++ = cp;
 366                     for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
 367                             if (*cp == ' ' || *cp == '\t') {
 368                                     *cp = 0;
 369                                     n = 1;
 370                             } else if (n) {
 371                                     *pp++ = cp;
 372                                     n = 0;
 373                             }
 374                     }
 375                     /* null terminate last domain if there are excess */
 376                     while (*cp != '\0' && *cp != ' ' && *cp != '\t')
 377                             cp++;
 378                     *cp = '\0';
 379                     *pp++ = 0;
 380                     havesearch = 1;
 381                     continue;
 382                 }
 383                 /* read nameservers to query */
 384                 if (MATCH(buf, "nameserver") && nserv < maxns) {
 385                     struct addrinfo hints, *ai;
 386                     char sbuf[NI_MAXSERV];
 387                     const size_t minsiz =
 388                         sizeof(statp->_u._ext.ext->nsaddrs[0]);
 389
 390                     cp = buf + sizeof("nameserver") - 1;
 391                     while (*cp == ' ' || *cp == '\t')
 392                         cp++;
 393                     cp[strcspn(cp, ";# \t\n")] = '\0';
 394                     if ((*cp != '\0') && (*cp != '\n')) {
 395                         memset(&hints, 0, sizeof(hints));
 396                         hints.ai_family = PF_UNSPEC;
 397                         hints.ai_socktype = SOCK_DGRAM; /*dummy*/
 398                         hints.ai_flags = AI_NUMERICHOST;
 399                         sprintf(sbuf, "%u", NAMESERVER_PORT);
 400                         if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
 401                             ai->ai_addrlen <= minsiz) {
 402                             if (statp->_u._ext.ext != NULL) {
 403                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 404                                     ai->ai_addr, ai->ai_addrlen);
 405                             }
 406                             if (ai->ai_addrlen <=
 407                                 sizeof(statp->nsaddr_list[nserv])) {
 408                                 memcpy(&statp->nsaddr_list[nserv],
 409                                     ai->ai_addr, ai->ai_addrlen);
 410                             } else
 411                                 statp->nsaddr_list[nserv].sin_family = 0;
 412                             freeaddrinfo(ai);
 413                             nserv++;
 414                         }
 415                     }
 416                     continue;
 417                 }
 418 #ifdef RESOLVSORT
 419                 if (MATCH(buf, "sortlist")) {
 420                     struct in_addr a;
 421
 422                     cp = buf + sizeof("sortlist") - 1;
 423                     while (nsort < MAXRESOLVSORT) {
 424                         while (*cp == ' ' || *cp == '\t')
 425                             cp++;
 426                         if (*cp == '\0' || *cp == '\n' || *cp == ';')
 427                             break;
 428                         net = cp;
 429                         while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
 430                                isascii(*cp) && !isspace((unsigned char)*cp))
 431                                 cp++;
 432                         n = *cp;
 433                         *cp = 0;
 434                         if (inet_aton(net, &a)) {
 435                             statp->sort_list[nsort].addr = a;
 436                             if (ISSORTMASK(n)) {
 437                                 *cp++ = n;
 438                                 net = cp;
 439                                 while (*cp && *cp != ';' &&
 440                                         isascii(*cp) &&
 441                                         !isspace((unsigned char)*cp))
 442                                     cp++;
 443                                 n = *cp;
 444                                 *cp = 0;
 445                                 if (inet_aton(net, &a)) {
 446                                     statp->sort_list[nsort].mask = a.s_addr;
 447                                 } else {
 448                                     statp->sort_list[nsort].mask =
 449                                         net_mask(statp->sort_list[nsort].addr);
 450                                 }
 451                             } else {
 452                                 statp->sort_list[nsort].mask =
 453                                     net_mask(statp->sort_list[nsort].addr);
 454                             }
 455                             nsort++;
 456                         }
 457                         *cp = n;
 458                     }
 459                     continue;
 460                 }
 461 #endif
 462                 if (MATCH(buf, "options")) {
 463                     res_setoptions(statp, buf + sizeof("options") - 1, "conf");
 464                     continue;
 465                 }
 466             }
 467             if (nserv > 0)
 468                 statp->nscount = nserv;
 469 #ifdef RESOLVSORT
 470             statp->nsort = nsort;
 471 #endif
 472             (void) fclose(fp);
 473         }
 474 /*
 475  * Last chance to get a nameserver.  This should not normally
 476  * be necessary
 477  */
 478 #ifdef NO_RESOLV_CONF
 479         if(nserv == 0)
 480                 nserv = get_nameservers(statp);
 481 #endif
 482
 483         if (statp->defdname[0] == 0 &&
 484             gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
 485             (cp = strchr(buf, '.')) != NULL)
 486                 strcpy(statp->defdname, cp + 1);
 487
 488         /* find components of local domain that might be searched */
 489         if (havesearch == 0) {
 490                 pp = statp->dnsrch;
 491                 *pp++ = statp->defdname;
 492                 *pp = NULL;
 493
 494                 dots = 0;
 495                 for (cp = statp->defdname; *cp; cp++)
 496                         dots += (*cp == '.');
 497
 498                 cp = statp->defdname;
 499                 while (pp < statp->dnsrch + MAXDFLSRCH) {
 500                         if (dots < LOCALDOMAINPARTS)
 501                                 break;
 502                         cp = strchr(cp, '.') + 1;    /*%< we know there is one */
 503                         *pp++ = cp;
 504                         dots--;
 505                 }
 506                 *pp = NULL;
 507 #ifdef DEBUG
 508                 if (statp->options & RES_DEBUG) {
 509                         printf(";; res_init()... default dnsrch list:\n");
 510                         for (pp = statp->dnsrch; *pp; pp++)
 511                                 printf(";;\t%s\n", *pp);
 512                         printf(";;\t..END..\n");
 513                 }
 514 #endif
 515         }
 516
 517         if ((cp = getenv("RES_OPTIONS")) != NULL)
 518                 res_setoptions(statp, cp, "env");
 519         statp->options |= RES_INIT;
 520         return (statp->res_h_errno);
 521 }
 522
 523 static void
 524 res_setoptions(res_state statp, const char *options, const char *source)
 525 {
 526         const char *cp = options;
 527         int i;
 528         size_t j;
 529         struct __res_state_ext *ext = statp->_u._ext.ext;
 530
 531 #ifdef DEBUG
 532         if (statp->options & RES_DEBUG)
 533                 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
 534                        options, source);
 535 #endif
 536         while (*cp) {
 537                 /* skip leading and inner runs of spaces */
 538                 while (*cp == ' ' || *cp == '\t')
 539                         cp++;
 540                 /* search for and process individual options */
 541                 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
 542                         i = atoi(cp + sizeof("ndots:") - 1);
 543                         if (i <= RES_MAXNDOTS)
 544                                 statp->ndots = i;
 545                         else
 546                                 statp->ndots = RES_MAXNDOTS;
 547 #ifdef DEBUG
 548                         if (statp->options & RES_DEBUG)
 549                                 printf(";;\tndots=%d\n", statp->ndots);
 550 #endif
 551                 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
 552                         i = atoi(cp + sizeof("timeout:") - 1);
 553                         if (i <= RES_MAXRETRANS)
 554                                 statp->retrans = i;
 555                         else
 556                                 statp->retrans = RES_MAXRETRANS;
 557 #ifdef DEBUG
 558                         if (statp->options & RES_DEBUG)
 559                                 printf(";;\ttimeout=%d\n", statp->retrans);
 560 #endif
 561 #ifdef  SOLARIS2
 562                 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
 563                         /*
 564                          * For backward compatibility, 'retrans' is
 565                          * supported as an alias for 'timeout', though
 566                          * without an imposed maximum.
 567                          */
 568                         statp->retrans = atoi(cp + sizeof("retrans:") - 1);
 569                 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
 570                         /*
 571                          * For backward compatibility, 'retry' is
 572                          * supported as an alias for 'attempts', though
 573                          * without an imposed maximum.
 574                          */
 575                         statp->retry = atoi(cp + sizeof("retry:") - 1);
 576 #endif  /* SOLARIS2 */
 577                 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
 578                         i = atoi(cp + sizeof("attempts:") - 1);
 579                         if (i <= RES_MAXRETRY)
 580                                 statp->retry = i;
 581                         else
 582                                 statp->retry = RES_MAXRETRY;
 583 #ifdef DEBUG
 584                         if (statp->options & RES_DEBUG)
 585                                 printf(";;\tattempts=%d\n", statp->retry);
 586 #endif
 587                 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
 588 #ifdef DEBUG
 589                         if (!(statp->options & RES_DEBUG)) {
 590                                 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
 591                                        options, source);
 592                                 statp->options |= RES_DEBUG;
 593                         }
 594                         printf(";;\tdebug\n");
 595 #endif
 596                 } else if (!strncmp(cp, "no_tld_query",
 597                                     sizeof("no_tld_query") - 1) ||
 598                            !strncmp(cp, "no-tld-query",
 599                                     sizeof("no-tld-query") - 1)) {
 600                         statp->options |= RES_NOTLDQUERY;
 601                 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
 602                         statp->options |= RES_USE_INET6;
 603                 } else if (!strncmp(cp, "inet4", sizeof("inet4") - 1)) {
 604                         statp->options |= RES_USE_INET4;
 605                 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
 606                         statp->options |= RES_ROTATE;
 607                 } else if (!strncmp(cp, "no-check-names",
 608                                     sizeof("no-check-names") - 1)) {
 609                         statp->options |= RES_NOCHECKNAME;
 610                 }
 611 #ifdef RES_USE_EDNS0
 612                 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
 613                         statp->options |= RES_USE_EDNS0;
 614                 }
 615 #endif
 616                 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
 617                         statp->options |= RES_USE_DNAME;
 618                 }
 619                 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
 620                         if (ext == NULL)
 621                                 goto skip;
 622                         cp += sizeof("nibble:") - 1;
 623                         j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
 624                         strncpy(ext->nsuffix, cp, j);
 625                         ext->nsuffix[j] = '\0';
 626                 }
 627                 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
 628                         if (ext == NULL)
 629                                 goto skip;
 630                         cp += sizeof("nibble2:") - 1;
 631                         j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
 632                         strncpy(ext->nsuffix2, cp, j);
 633                         ext->nsuffix2[j] = '\0';
 634                 }
 635                 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
 636                         cp += sizeof("v6revmode:") - 1;
 637                         /* "nibble" and "bitstring" used to be valid */
 638                         if (!strncmp(cp, "single", sizeof("single") - 1)) {
 639                                 statp->options |= RES_NO_NIBBLE2;
 640                         } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
 641                                 statp->options &=
 642                                          ~RES_NO_NIBBLE2;
 643                         }
 644                 }
 645                 else {
 646                         /* XXX - print a warning here? */
 647                 }
 648    skip:
 649                 /* skip to next run of spaces */
 650                 while (*cp && *cp != ' ' && *cp != '\t')
 651                         cp++;
 652         }
 653 }
 654
 655 #ifdef RESOLVSORT
 656 /* XXX - should really support CIDR which means explicit masks always. */
 657 static uint32_t
 658 net_mask(struct in_addr in) /*!< XXX - should really use system's version of this  */
 659 {
 660         register uint32_t i = ntohl(in.s_addr);
 661
 662         if (IN_CLASSA(i))
 663                 return (htonl(IN_CLASSA_NET));
 664         else if (IN_CLASSB(i))
 665                 return (htonl(IN_CLASSB_NET));
 666         return (htonl(IN_CLASSC_NET));
 667 }
 668 #endif
 669
 670 void
 671 res_rndinit(res_state statp)
 672 {
 673         struct timeval now;
 674         uint32_t u32;
 675         uint16_t u16;
 676         u_char *rnd = statp->_rnd;
 677
 678         gettimeofday(&now, NULL);
 679         u32 = (uint32_t)now.tv_sec;
 680         memcpy(rnd, &u32, 4);
 681         u32 = now.tv_usec;
 682         memcpy(rnd + 4, &u32, 4);
 683         u32 += (uint32_t)now.tv_sec;
 684         memcpy(rnd + 8, &u32, 4);
 685         u16 = getpid();
 686         memcpy(rnd + 12, &u16, 2);
 687 }
 688
 689 u_int
 690 res_nrandomid(res_state statp)
 691 {
 692         struct timeval now;
 693         uint16_t u16;
 694         MD5_CTX ctx;
 695         u_char *rnd = statp->_rnd;
 696
 697         gettimeofday(&now, NULL);
 698         u16 = (uint16_t) (now.tv_sec ^ now.tv_usec);
 699         memcpy(rnd + 14, &u16, 2);
 700 #ifndef HAVE_MD5
 701         MD5_Init(&ctx);
 702         MD5_Update(&ctx, rnd, 16);
 703         MD5_Final(rnd, &ctx);
 704 #else
 705         MD5Init(&ctx);
 706         MD5Update(&ctx, rnd, 16);
 707         MD5Final(rnd, &ctx);
 708 #endif
 709         memcpy(&u16, rnd + 14, 2);
 710         return ((u_int) u16);
 711 }
 712
 713 /*%
 714  * This routine is for closing the socket if a virtual circuit is used and
 715  * the program wants to close it.  This provides support for endhostent()
 716  * which expects to close the socket.
 717  *
 718  * This routine is not expected to be user visible.
 719  */
 720 void
 721 res_nclose(res_state statp)
 722 {
 723         int ns;
 724
 725         if (statp->_vcsock >= 0) {
 726                 (void) close(statp->_vcsock);
 727                 statp->_vcsock = -1;
 728                 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
 729         }
 730         for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
 731                 if (statp->_u._ext.nssocks[ns] != -1) {
 732                         (void) close(statp->_u._ext.nssocks[ns]);
 733                         statp->_u._ext.nssocks[ns] = -1;
 734                 }
 735         }
 736 }
 737
 738 void
 739 res_ndestroy(res_state statp)
 740 {
 741         res_nclose(statp);
 742         if (statp->_u._ext.ext != NULL) {
 743                 if (statp->_u._ext.ext->kq != -1)
 744                         (void)close(statp->_u._ext.ext->kq);
 745                 if (statp->_u._ext.ext->resfd != -1)
 746                         (void)close(statp->_u._ext.ext->resfd);
 747                 free(statp->_u._ext.ext);
 748                 statp->_u._ext.ext = NULL;
 749         }
 750         statp->options &= ~RES_INIT;
 751 }
 752
 753 const char *
 754 res_get_nibblesuffix(res_state statp)
 755 {
 756         if (statp->_u._ext.ext)
 757                 return (statp->_u._ext.ext->nsuffix);
 758         return ("ip6.arpa");
 759 }
 760
 761 const char *
 762 res_get_nibblesuffix2(res_state statp)
 763 {
 764         if (statp->_u._ext.ext)
 765                 return (statp->_u._ext.ext->nsuffix2);
 766         return ("ip6.int");
 767 }
 768
 769 void
 770 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt)
 771 {
 772         int i, nserv;
 773         size_t size;
 774
 775         /* close open servers */
 776         res_nclose(statp);
 777
 778         /* cause rtt times to be forgotten */
 779         statp->_u._ext.nscount = 0;
 780
 781         nserv = 0;
 782         for (i = 0; i < cnt && nserv < MAXNS; i++) {
 783                 switch (set->sin.sin_family) {
 784                 case AF_INET:
 785                         size = sizeof(set->sin);
 786                         if (statp->_u._ext.ext)
 787                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 788                                         &set->sin, size);
 789                         if (size <= sizeof(statp->nsaddr_list[nserv]))
 790                                 memcpy(&statp->nsaddr_list[nserv],
 791                                         &set->sin, size);
 792                         else
 793                                 statp->nsaddr_list[nserv].sin_family = 0;
 794                         nserv++;
 795                         break;
 796
 797 #ifdef HAS_INET6_STRUCTS
 798                 case AF_INET6:
 799                         size = sizeof(set->sin6);
 800                         if (statp->_u._ext.ext)
 801                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 802                                         &set->sin6, size);
 803                         if (size <= sizeof(statp->nsaddr_list[nserv]))
 804                                 memcpy(&statp->nsaddr_list[nserv],
 805                                         &set->sin6, size);
 806                         else
 807                                 statp->nsaddr_list[nserv].sin_family = 0;
 808                         nserv++;
 809                         break;
 810 #endif
 811
 812                 default:
 813                         break;
 814                 }
 815                 set++;
 816         }
 817         statp->nscount = nserv;
 818
 819 }
 820
 821 int
 822 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt)
 823 {
 824         int i;
 825         size_t size;
 826         uint16_t family;
 827
 828         for (i = 0; i < statp->nscount && i < cnt; i++) {
 829                 if (statp->_u._ext.ext)
 830                         family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
 831                 else
 832                         family = statp->nsaddr_list[i].sin_family;
 833
 834                 switch (family) {
 835                 case AF_INET:
 836                         size = sizeof(set->sin);
 837                         if (statp->_u._ext.ext)
 838                                 memcpy(&set->sin,
 839                                        &statp->_u._ext.ext->nsaddrs[i],
 840                                        size);
 841                         else
 842                                 memcpy(&set->sin, &statp->nsaddr_list[i],
 843                                        size);
 844                         break;
 845
 846 #ifdef HAS_INET6_STRUCTS
 847                 case AF_INET6:
 848                         size = sizeof(set->sin6);
 849                         if (statp->_u._ext.ext)
 850                                 memcpy(&set->sin6,
 851                                        &statp->_u._ext.ext->nsaddrs[i],
 852                                        size);
 853                         else
 854                                 memcpy(&set->sin6, &statp->nsaddr_list[i],
 855                                        size);
 856                         break;
 857 #endif
 858
 859                 default:
 860                         set->sin.sin_family = 0;
 861                         break;
 862                 }
 863                 set++;
 864         }
 865         return (statp->nscount);
 866 }
 867
 868 /*! \file */