contrib/bind/lib/bind/resolv/res_init.c

   1 /*
   2  * Copyright (c) 1985, 1989, 1993
   3  *    The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  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
  54 /*
  55  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  56  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  57  *
  58  * Permission to use, copy, modify, and distribute this software for any
  59  * purpose with or without fee is hereby granted, provided that the above
  60  * copyright notice and this permission notice appear in all copies.
  61  *
  62  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  63  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  64  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  65  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  66  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  67  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  68  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  69  */
  70
  71 #if defined(LIBC_SCCS) && !defined(lint)
  72 static const char sccsid[] = "@(#)res_init.c    8.1 (Berkeley) 6/7/93";
  73 static const char rcsid[] = "$Id: res_init.c,v 1.23 2007/07/09 01:43:23 marka Exp $";
  74 #endif /* LIBC_SCCS and not lint */
  75
  76 #include "port_before.h"
  77
  78 #ifdef _LIBC
  79 #include "namespace.h"
  80 #endif
  81 #include <sys/types.h>
  82 #include <sys/param.h>
  83 #include <sys/socket.h>
  84 #include <sys/time.h>
  85
  86 #include <netinet/in.h>
  87 #include <arpa/inet.h>
  88 #include <arpa/nameser.h>
  89
  90 #include <ctype.h>
  91 #include <stdio.h>
  92 #include <stdlib.h>
  93 #include <string.h>
  94 #include <unistd.h>
  95 #include <netdb.h>
  96 #ifdef _LIBC
  97 #include "un-namespace.h"
  98 #endif
  99
 100 #include "port_after.h"
 101
 102 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
 103 #include <resolv.h>
 104
 105 #include "res_private.h"
 106
 107 /*% Options.  Should all be left alone. */
 108 #define RESOLVSORT
 109 #define DEBUG
 110
 111 #ifdef SOLARIS2
 112 #include <sys/systeminfo.h>
 113 #endif
 114
 115 static void res_setoptions __P((res_state, const char *, const char *));
 116
 117 #ifdef RESOLVSORT
 118 static const char sort_mask[] = "/&";
 119 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
 120 static u_int32_t net_mask __P((struct in_addr));
 121 #endif
 122
 123 #if !defined(isascii)   /*%< XXX - could be a function */
 124 # define isascii(c) (!(c & 0200))
 125 #endif
 126
 127 /*
 128  * Resolver state default settings.
 129  */
 130
 131 /*%
 132  * Set up default settings.  If the configuration file exist, the values
 133  * there will have precedence.  Otherwise, the server address is set to
 134  * INADDR_ANY and the default domain name comes from the gethostname().
 135  *
 136  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
 137  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
 138  * since it was noted that INADDR_ANY actually meant ``the first interface
 139  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
 140  * it had to be "up" in order for you to reach your own name server.  It
 141  * was later decided that since the recommended practice is to always
 142  * install local static routes through 127.0.0.1 for all your network
 143  * interfaces, that we could solve this problem without a code change.
 144  *
 145  * The configuration file should always be used, since it is the only way
 146  * to specify a default domain.  If you are running a server on your local
 147  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
 148  * in the configuration file.
 149  *
 150  * Return 0 if completes successfully, -1 on error
 151  */
 152 int
 153 res_ninit(res_state statp) {
 154         extern int __res_vinit(res_state, int);
 155
 156         return (__res_vinit(statp, 0));
 157 }
 158
 159 /*% This function has to be reachable by res_data.c but not publically. */
 160 int
 161 __res_vinit(res_state statp, int preinit) {
 162         register FILE *fp;
 163         register char *cp, **pp;
 164         register int n;
 165         char buf[BUFSIZ];
 166         int nserv = 0;    /*%< number of nameserver records read from file */
 167         int haveenv = 0;
 168         int havesearch = 0;
 169 #ifdef RESOLVSORT
 170         int nsort = 0;
 171         char *net;
 172 #endif
 173         int dots;
 174         union res_sockaddr_union u[2];
 175         int maxns = MAXNS;
 176
 177         RES_SET_H_ERRNO(statp, 0);
 178         if (statp->_u._ext.ext != NULL)
 179                 res_ndestroy(statp);
 180
 181         if (!preinit) {
 182                 statp->retrans = RES_TIMEOUT;
 183                 statp->retry = RES_DFLRETRY;
 184                 statp->options = RES_DEFAULT;
 185                 statp->id = res_randomid();
 186         }
 187
 188         memset(u, 0, sizeof(u));
 189 #ifdef USELOOPBACK
 190         u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
 191 #else
 192         u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
 193 #endif
 194         u[nserv].sin.sin_family = AF_INET;
 195         u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
 196 #ifdef HAVE_SA_LEN
 197         u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
 198 #endif
 199         nserv++;
 200 #ifdef HAS_INET6_STRUCTS
 201 #ifdef USELOOPBACK
 202         u[nserv].sin6.sin6_addr = in6addr_loopback;
 203 #else
 204         u[nserv].sin6.sin6_addr = in6addr_any;
 205 #endif
 206         u[nserv].sin6.sin6_family = AF_INET6;
 207         u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
 208 #ifdef HAVE_SA_LEN
 209         u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
 210 #endif
 211         nserv++;
 212 #endif
 213         statp->nscount = 0;
 214         statp->ndots = 1;
 215         statp->pfcode = 0;
 216         statp->_vcsock = -1;
 217         statp->_flags = 0;
 218         statp->qhook = NULL;
 219         statp->rhook = NULL;
 220         statp->_u._ext.nscount = 0;
 221         statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
 222         if (statp->_u._ext.ext != NULL) {
 223                 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
 224                 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
 225                 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
 226                 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
 227         } else {
 228                 /*
 229                  * Historically res_init() rarely, if at all, failed.
 230                  * Examples and applications exist which do not check
 231                  * our return code.  Furthermore several applications
 232                  * simply call us to get the systems domainname.  So
 233                  * rather then immediately fail here we store the
 234                  * failure, which is returned later, in h_errno.  And
 235                  * prevent the collection of 'nameserver' information
 236                  * by setting maxns to 0.  Thus applications that fail
 237                  * to check our return code wont be able to make
 238                  * queries anyhow.
 239                  */
 240                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 241                 maxns = 0;
 242         }
 243 #ifdef RESOLVSORT
 244         statp->nsort = 0;
 245 #endif
 246         res_setservers(statp, u, nserv);
 247
 248 #ifdef  SOLARIS2
 249         /*
 250          * The old libresolv derived the defaultdomain from NIS/NIS+.
 251          * We want to keep this behaviour
 252          */
 253         {
 254                 char buf[sizeof(statp->defdname)], *cp;
 255                 int ret;
 256
 257                 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
 258                         (unsigned int)ret <= sizeof(buf)) {
 259                         if (buf[0] == '+')
 260                                 buf[0] = '.';
 261                         cp = strchr(buf, '.');
 262                         cp = (cp == NULL) ? buf : (cp + 1);
 263                         strncpy(statp->defdname, cp,
 264                                 sizeof(statp->defdname) - 1);
 265                         statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 266                 }
 267         }
 268 #endif  /* SOLARIS2 */
 269
 270         /* Allow user to override the local domain definition */
 271         if ((cp = getenv("LOCALDOMAIN")) != NULL) {
 272                 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 273                 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 274                 haveenv++;
 275
 276                 /*
 277                  * Set search list to be blank-separated strings
 278                  * from rest of env value.  Permits users of LOCALDOMAIN
 279                  * to still have a search list, and anyone to set the
 280                  * one that they want to use as an individual (even more
 281                  * important now that the rfc1535 stuff restricts searches)
 282                  */
 283                 cp = statp->defdname;
 284                 pp = statp->dnsrch;
 285                 *pp++ = cp;
 286                 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
 287                         if (*cp == '\n')        /*%< silly backwards compat */
 288                                 break;
 289                         else if (*cp == ' ' || *cp == '\t') {
 290                                 *cp = 0;
 291                                 n = 1;
 292                         } else if (n) {
 293                                 *pp++ = cp;
 294                                 n = 0;
 295                                 havesearch = 1;
 296                         }
 297                 }
 298                 /* null terminate last domain if there are excess */
 299                 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
 300                         cp++;
 301                 *cp = '\0';
 302                 *pp++ = 0;
 303         }
 304
 305 #define MATCH(line, name) \
 306         (!strncmp(line, name, sizeof(name) - 1) && \
 307         (line[sizeof(name) - 1] == ' ' || \
 308          line[sizeof(name) - 1] == '\t'))
 309
 310         nserv = 0;
 311         if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
 312             /* read the config file */
 313             while (fgets(buf, sizeof(buf), fp) != NULL) {
 314                 /* skip comments */
 315                 if (*buf == ';' || *buf == '#')
 316                         continue;
 317                 /* read default domain name */
 318                 if (MATCH(buf, "domain")) {
 319                     if (haveenv)        /*%< skip if have from environ */
 320                             continue;
 321                     cp = buf + sizeof("domain") - 1;
 322                     while (*cp == ' ' || *cp == '\t')
 323                             cp++;
 324                     if ((*cp == '\0') || (*cp == '\n'))
 325                             continue;
 326                     strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 327                     statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 328                     if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
 329                             *cp = '\0';
 330                     havesearch = 0;
 331                     continue;
 332                 }
 333                 /* set search list */
 334                 if (MATCH(buf, "search")) {
 335                     if (haveenv)        /*%< skip if have from environ */
 336                             continue;
 337                     cp = buf + sizeof("search") - 1;
 338                     while (*cp == ' ' || *cp == '\t')
 339                             cp++;
 340                     if ((*cp == '\0') || (*cp == '\n'))
 341                             continue;
 342                     strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
 343                     statp->defdname[sizeof(statp->defdname) - 1] = '\0';
 344                     if ((cp = strchr(statp->defdname, '\n')) != NULL)
 345                             *cp = '\0';
 346                     /*
 347                      * Set search list to be blank-separated strings
 348                      * on rest of line.
 349                      */
 350                     cp = statp->defdname;
 351                     pp = statp->dnsrch;
 352                     *pp++ = cp;
 353                     for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
 354                             if (*cp == ' ' || *cp == '\t') {
 355                                     *cp = 0;
 356                                     n = 1;
 357                             } else if (n) {
 358                                     *pp++ = cp;
 359                                     n = 0;
 360                             }
 361                     }
 362                     /* null terminate last domain if there are excess */
 363                     while (*cp != '\0' && *cp != ' ' && *cp != '\t')
 364                             cp++;
 365                     *cp = '\0';
 366                     *pp++ = 0;
 367                     havesearch = 1;
 368                     continue;
 369                 }
 370                 /* read nameservers to query */
 371                 if (MATCH(buf, "nameserver") && nserv < maxns) {
 372                     struct addrinfo hints, *ai;
 373                     char sbuf[NI_MAXSERV];
 374                     const size_t minsiz =
 375                         sizeof(statp->_u._ext.ext->nsaddrs[0]);
 376
 377                     cp = buf + sizeof("nameserver") - 1;
 378                     while (*cp == ' ' || *cp == '\t')
 379                         cp++;
 380                     cp[strcspn(cp, ";# \t\n")] = '\0';
 381                     if ((*cp != '\0') && (*cp != '\n')) {
 382                         memset(&hints, 0, sizeof(hints));
 383                         hints.ai_family = PF_UNSPEC;
 384                         hints.ai_socktype = SOCK_DGRAM; /*dummy*/
 385                         hints.ai_flags = AI_NUMERICHOST;
 386                         sprintf(sbuf, "%u", NAMESERVER_PORT);
 387                         if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
 388                             ai->ai_addrlen <= minsiz) {
 389                             if (statp->_u._ext.ext != NULL) {
 390                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 391                                     ai->ai_addr, ai->ai_addrlen);
 392                             }
 393                             if (ai->ai_addrlen <=
 394                                 sizeof(statp->nsaddr_list[nserv])) {
 395                                 memcpy(&statp->nsaddr_list[nserv],
 396                                     ai->ai_addr, ai->ai_addrlen);
 397                             } else
 398                                 statp->nsaddr_list[nserv].sin_family = 0;
 399                             freeaddrinfo(ai);
 400                             nserv++;
 401                         }
 402                     }
 403                     continue;
 404                 }
 405 #ifdef RESOLVSORT
 406                 if (MATCH(buf, "sortlist")) {
 407                     struct in_addr a;
 408
 409                     cp = buf + sizeof("sortlist") - 1;
 410                     while (nsort < MAXRESOLVSORT) {
 411                         while (*cp == ' ' || *cp == '\t')
 412                             cp++;
 413                         if (*cp == '\0' || *cp == '\n' || *cp == ';')
 414                             break;
 415                         net = cp;
 416                         while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
 417                                isascii(*cp) && !isspace((unsigned char)*cp))
 418                                 cp++;
 419                         n = *cp;
 420                         *cp = 0;
 421                         if (inet_aton(net, &a)) {
 422                             statp->sort_list[nsort].addr = a;
 423                             if (ISSORTMASK(n)) {
 424                                 *cp++ = n;
 425                                 net = cp;
 426                                 while (*cp && *cp != ';' &&
 427                                         isascii(*cp) &&
 428                                         !isspace((unsigned char)*cp))
 429                                     cp++;
 430                                 n = *cp;
 431                                 *cp = 0;
 432                                 if (inet_aton(net, &a)) {
 433                                     statp->sort_list[nsort].mask = a.s_addr;
 434                                 } else {
 435                                     statp->sort_list[nsort].mask =
 436                                         net_mask(statp->sort_list[nsort].addr);
 437                                 }
 438                             } else {
 439                                 statp->sort_list[nsort].mask =
 440                                     net_mask(statp->sort_list[nsort].addr);
 441                             }
 442                             nsort++;
 443                         }
 444                         *cp = n;
 445                     }
 446                     continue;
 447                 }
 448 #endif
 449                 if (MATCH(buf, "options")) {
 450                     res_setoptions(statp, buf + sizeof("options") - 1, "conf");
 451                     continue;
 452                 }
 453             }
 454             if (nserv > 0)
 455                 statp->nscount = nserv;
 456 #ifdef RESOLVSORT
 457             statp->nsort = nsort;
 458 #endif
 459             (void) fclose(fp);
 460         }
 461 /*
 462  * Last chance to get a nameserver.  This should not normally
 463  * be necessary
 464  */
 465 #ifdef NO_RESOLV_CONF
 466         if(nserv == 0)
 467                 nserv = get_nameservers(statp);
 468 #endif
 469
 470         if (statp->defdname[0] == 0 &&
 471             gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
 472             (cp = strchr(buf, '.')) != NULL)
 473                 strcpy(statp->defdname, cp + 1);
 474
 475         /* find components of local domain that might be searched */
 476         if (havesearch == 0) {
 477                 pp = statp->dnsrch;
 478                 *pp++ = statp->defdname;
 479                 *pp = NULL;
 480
 481                 dots = 0;
 482                 for (cp = statp->defdname; *cp; cp++)
 483                         dots += (*cp == '.');
 484
 485                 cp = statp->defdname;
 486                 while (pp < statp->dnsrch + MAXDFLSRCH) {
 487                         if (dots < LOCALDOMAINPARTS)
 488                                 break;
 489                         cp = strchr(cp, '.') + 1;    /*%< we know there is one */
 490                         *pp++ = cp;
 491                         dots--;
 492                 }
 493                 *pp = NULL;
 494 #ifdef DEBUG
 495                 if (statp->options & RES_DEBUG) {
 496                         printf(";; res_init()... default dnsrch list:\n");
 497                         for (pp = statp->dnsrch; *pp; pp++)
 498                                 printf(";;\t%s\n", *pp);
 499                         printf(";;\t..END..\n");
 500                 }
 501 #endif
 502         }
 503
 504         if ((cp = getenv("RES_OPTIONS")) != NULL)
 505                 res_setoptions(statp, cp, "env");
 506         statp->options |= RES_INIT;
 507         return (statp->res_h_errno);
 508 }
 509
 510 static void
 511 res_setoptions(res_state statp, const char *options, const char *source)
 512 {
 513         const char *cp = options;
 514         int i;
 515 #ifndef _LIBC
 516         struct __res_state_ext *ext = statp->_u._ext.ext;
 517 #endif
 518
 519 #ifdef DEBUG
 520         if (statp->options & RES_DEBUG)
 521                 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
 522                        options, source);
 523 #endif
 524         while (*cp) {
 525                 /* skip leading and inner runs of spaces */
 526                 while (*cp == ' ' || *cp == '\t')
 527                         cp++;
 528                 /* search for and process individual options */
 529                 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
 530                         i = atoi(cp + sizeof("ndots:") - 1);
 531                         if (i <= RES_MAXNDOTS)
 532                                 statp->ndots = i;
 533                         else
 534                                 statp->ndots = RES_MAXNDOTS;
 535 #ifdef DEBUG
 536                         if (statp->options & RES_DEBUG)
 537                                 printf(";;\tndots=%d\n", statp->ndots);
 538 #endif
 539                 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
 540                         i = atoi(cp + sizeof("timeout:") - 1);
 541                         if (i <= RES_MAXRETRANS)
 542                                 statp->retrans = i;
 543                         else
 544                                 statp->retrans = RES_MAXRETRANS;
 545 #ifdef DEBUG
 546                         if (statp->options & RES_DEBUG)
 547                                 printf(";;\ttimeout=%d\n", statp->retrans);
 548 #endif
 549 #ifdef  SOLARIS2
 550                 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
 551                         /*
 552                          * For backward compatibility, 'retrans' is
 553                          * supported as an alias for 'timeout', though
 554                          * without an imposed maximum.
 555                          */
 556                         statp->retrans = atoi(cp + sizeof("retrans:") - 1);
 557                 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
 558                         /*
 559                          * For backward compatibility, 'retry' is
 560                          * supported as an alias for 'attempts', though
 561                          * without an imposed maximum.
 562                          */
 563                         statp->retry = atoi(cp + sizeof("retry:") - 1);
 564 #endif  /* SOLARIS2 */
 565                 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
 566                         i = atoi(cp + sizeof("attempts:") - 1);
 567                         if (i <= RES_MAXRETRY)
 568                                 statp->retry = i;
 569                         else
 570                                 statp->retry = RES_MAXRETRY;
 571 #ifdef DEBUG
 572                         if (statp->options & RES_DEBUG)
 573                                 printf(";;\tattempts=%d\n", statp->retry);
 574 #endif
 575                 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
 576 #ifdef DEBUG
 577                         if (!(statp->options & RES_DEBUG)) {
 578                                 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
 579                                        options, source);
 580                                 statp->options |= RES_DEBUG;
 581                         }
 582                         printf(";;\tdebug\n");
 583 #endif
 584                 } else if (!strncmp(cp, "no_tld_query",
 585                                     sizeof("no_tld_query") - 1) ||
 586                            !strncmp(cp, "no-tld-query",
 587                                     sizeof("no-tld-query") - 1)) {
 588                         statp->options |= RES_NOTLDQUERY;
 589                 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
 590                         statp->options |= RES_USE_INET6;
 591                 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
 592                         statp->options |= RES_ROTATE;
 593                 } else if (!strncmp(cp, "no-check-names",
 594                                     sizeof("no-check-names") - 1)) {
 595                         statp->options |= RES_NOCHECKNAME;
 596                 }
 597 #ifdef RES_USE_EDNS0
 598                 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
 599                         statp->options |= RES_USE_EDNS0;
 600                 }
 601 #endif
 602 #ifndef _LIBC
 603                 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
 604                         statp->options |= RES_USE_DNAME;
 605                 }
 606                 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
 607                         if (ext == NULL)
 608                                 goto skip;
 609                         cp += sizeof("nibble:") - 1;
 610                         i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
 611                         strncpy(ext->nsuffix, cp, i);
 612                         ext->nsuffix[i] = '\0';
 613                 }
 614                 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
 615                         if (ext == NULL)
 616                                 goto skip;
 617                         cp += sizeof("nibble2:") - 1;
 618                         i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
 619                         strncpy(ext->nsuffix2, cp, i);
 620                         ext->nsuffix2[i] = '\0';
 621                 }
 622                 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
 623                         cp += sizeof("v6revmode:") - 1;
 624                         /* "nibble" and "bitstring" used to be valid */
 625                         if (!strncmp(cp, "single", sizeof("single") - 1)) {
 626                                 statp->options |= RES_NO_NIBBLE2;
 627                         } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
 628                                 statp->options &=
 629                                          ~RES_NO_NIBBLE2;
 630                         }
 631                 }
 632 #endif
 633                 else {
 634                         /* XXX - print a warning here? */
 635                 }
 636 #ifndef _LIBC
 637    skip:
 638 #endif
 639                 /* skip to next run of spaces */
 640                 while (*cp && *cp != ' ' && *cp != '\t')
 641                         cp++;
 642         }
 643 }
 644
 645 #ifdef RESOLVSORT
 646 /* XXX - should really support CIDR which means explicit masks always. */
 647 static u_int32_t
 648 net_mask(in)            /*!< XXX - should really use system's version of this  */
 649         struct in_addr in;
 650 {
 651         register u_int32_t i = ntohl(in.s_addr);
 652
 653         if (IN_CLASSA(i))
 654                 return (htonl(IN_CLASSA_NET));
 655         else if (IN_CLASSB(i))
 656                 return (htonl(IN_CLASSB_NET));
 657         return (htonl(IN_CLASSC_NET));
 658 }
 659 #endif
 660
 661 u_int
 662 res_randomid(void) {
 663         struct timeval now;
 664
 665         gettimeofday(&now, NULL);
 666         return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
 667 }
 668
 669 /*%
 670  * This routine is for closing the socket if a virtual circuit is used and
 671  * the program wants to close it.  This provides support for endhostent()
 672  * which expects to close the socket.
 673  *
 674  * This routine is not expected to be user visible.
 675  */
 676 void
 677 res_nclose(res_state statp) {
 678         int ns;
 679
 680         if (statp->_vcsock >= 0) {
 681 #ifndef _LIBC
 682                 (void) close(statp->_vcsock);
 683 #else
 684                 _close(statp->_vcsock);
 685 #endif
 686                 statp->_vcsock = -1;
 687                 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
 688         }
 689         for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
 690                 if (statp->_u._ext.nssocks[ns] != -1) {
 691 #ifndef _LIBC
 692                         (void) close(statp->_u._ext.nssocks[ns]);
 693 #else
 694                         _close(statp->_u._ext.nssocks[ns]);
 695 #endif
 696                         statp->_u._ext.nssocks[ns] = -1;
 697                 }
 698         }
 699 }
 700
 701 void
 702 res_ndestroy(res_state statp) {
 703         res_nclose(statp);
 704         if (statp->_u._ext.ext != NULL)
 705                 free(statp->_u._ext.ext);
 706         statp->options &= ~RES_INIT;
 707         statp->_u._ext.ext = NULL;
 708 }
 709
 710 #ifndef _LIBC
 711 const char *
 712 res_get_nibblesuffix(res_state statp) {
 713         if (statp->_u._ext.ext)
 714                 return (statp->_u._ext.ext->nsuffix);
 715         return ("ip6.arpa");
 716 }
 717
 718 const char *
 719 res_get_nibblesuffix2(res_state statp) {
 720         if (statp->_u._ext.ext)
 721                 return (statp->_u._ext.ext->nsuffix2);
 722         return ("ip6.int");
 723 }
 724 #endif
 725
 726 void
 727 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
 728         int i, nserv;
 729         size_t size;
 730
 731         /* close open servers */
 732         res_nclose(statp);
 733
 734         /* cause rtt times to be forgotten */
 735         statp->_u._ext.nscount = 0;
 736
 737         nserv = 0;
 738         for (i = 0; i < cnt && nserv < MAXNS; i++) {
 739                 switch (set->sin.sin_family) {
 740                 case AF_INET:
 741                         size = sizeof(set->sin);
 742                         if (statp->_u._ext.ext)
 743                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 744                                         &set->sin, size);
 745                         if (size <= sizeof(statp->nsaddr_list[nserv]))
 746                                 memcpy(&statp->nsaddr_list[nserv],
 747                                         &set->sin, size);
 748                         else
 749                                 statp->nsaddr_list[nserv].sin_family = 0;
 750                         nserv++;
 751                         break;
 752
 753 #ifdef HAS_INET6_STRUCTS
 754                 case AF_INET6:
 755                         size = sizeof(set->sin6);
 756                         if (statp->_u._ext.ext)
 757                                 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
 758                                         &set->sin6, size);
 759                         if (size <= sizeof(statp->nsaddr_list[nserv]))
 760                                 memcpy(&statp->nsaddr_list[nserv],
 761                                         &set->sin6, size);
 762                         else
 763                                 statp->nsaddr_list[nserv].sin_family = 0;
 764                         nserv++;
 765                         break;
 766 #endif
 767
 768                 default:
 769                         break;
 770                 }
 771                 set++;
 772         }
 773         statp->nscount = nserv;
 774
 775 }
 776
 777 int
 778 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
 779         int i;
 780         size_t size;
 781         u_int16_t family;
 782
 783         for (i = 0; i < statp->nscount && i < cnt; i++) {
 784                 if (statp->_u._ext.ext)
 785                         family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
 786                 else
 787                         family = statp->nsaddr_list[i].sin_family;
 788
 789                 switch (family) {
 790                 case AF_INET:
 791                         size = sizeof(set->sin);
 792                         if (statp->_u._ext.ext)
 793                                 memcpy(&set->sin,
 794                                        &statp->_u._ext.ext->nsaddrs[i],
 795                                        size);
 796                         else
 797                                 memcpy(&set->sin, &statp->nsaddr_list[i],
 798                                        size);
 799                         break;
 800
 801 #ifdef HAS_INET6_STRUCTS
 802                 case AF_INET6:
 803                         size = sizeof(set->sin6);
 804                         if (statp->_u._ext.ext)
 805                                 memcpy(&set->sin6,
 806                                        &statp->_u._ext.ext->nsaddrs[i],
 807                                        size);
 808                         else
 809                                 memcpy(&set->sin6, &statp->nsaddr_list[i],
 810                                        size);
 811                         break;
 812 #endif
 813
 814                 default:
 815                         set->sin.sin_family = 0;
 816                         break;
 817                 }
 818                 set++;
 819         }
 820         return (statp->nscount);
 821 }
 822 /*! \file */