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Annotation of src/lib/libc/resolv/res_init.c, Revision 1.13

1.13    ! ghen        1: /*     $NetBSD: res_init.c,v 1.1.1.3 2007/03/30 20:16:22 ghen Exp $    */
1.1       christos    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:
1.3       christos   73: #include <sys/cdefs.h>
1.1       christos   74: #if defined(LIBC_SCCS) && !defined(lint)
1.3       christos   75: #ifdef notdef
1.1       christos   76: static const char sccsid[] = "@(#)res_init.c   8.1 (Berkeley) 6/7/93";
1.9       christos   77: static const char rcsid[] = "Id: res_init.c,v 1.16.18.5 2006/08/30 23:23:13 marka Exp";
1.3       christos   78: #else
1.13    ! ghen       79: __RCSID("$NetBSD: res_init.c,v 1.12 2007/02/09 22:29:40 christos Exp $");
1.3       christos   80: #endif
1.1       christos   81: #endif /* LIBC_SCCS and not lint */
                     82:
                     83: #include "port_before.h"
                     84:
1.4       christos   85: #include "namespace.h"
1.1       christos   86: #include <sys/types.h>
                     87: #include <sys/param.h>
                     88: #include <sys/socket.h>
                     89: #include <sys/time.h>
                     90:
                     91: #include <netinet/in.h>
                     92: #include <arpa/inet.h>
                     93: #include <arpa/nameser.h>
                     94:
                     95: #include <ctype.h>
                     96: #include <stdio.h>
                     97: #include <stdlib.h>
                     98: #include <string.h>
                     99: #include <unistd.h>
                    100: #include <netdb.h>
                    101:
                    102: #include "port_after.h"
                    103:
1.5       christos  104: #if 0
1.4       christos  105: #ifdef __weak_alias
                    106: __weak_alias(res_ninit,_res_ninit)
                    107: __weak_alias(res_randomid,__res_randomid)
                    108: __weak_alias(res_nclose,_res_nclose)
                    109: __weak_alias(res_ndestroy,_res_ndestroy)
                    110: __weak_alias(res_get_nibblesuffix,__res_get_nibblesuffix)
                    111: __weak_alias(res_get_nibblesuffix2,__res_get_nibblesuffix2)
                    112: __weak_alias(res_getservers,__res_getservers)
                    113: __weak_alias(res_setservers,__res_setservers)
                    114: #endif
1.5       christos  115: #endif
1.4       christos  116:
                    117:
1.1       christos  118: /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
                    119: #include <resolv.h>
                    120:
                    121: #include "res_private.h"
                    122:
1.9       christos  123: /*% Options.  Should all be left alone. */
1.7       christos  124: #ifndef DEBUG
1.1       christos  125: #define DEBUG
1.7       christos  126: #endif
1.1       christos  127:
1.9       christos  128: #ifdef SOLARIS2
                    129: #include <sys/systeminfo.h>
                    130: #endif
                    131:
1.1       christos  132: static void res_setoptions __P((res_state, const char *, const char *));
                    133:
                    134: static const char sort_mask[] = "/&";
                    135: #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
                    136: static u_int32_t net_mask __P((struct in_addr));
                    137:
1.9       christos  138: #if !defined(isascii)  /*%< XXX - could be a function */
1.1       christos  139: # define isascii(c) (!(c & 0200))
                    140: #endif
                    141:
                    142: /*
                    143:  * Resolver state default settings.
                    144:  */
                    145:
1.9       christos  146: /*%
1.1       christos  147:  * Set up default settings.  If the configuration file exist, the values
                    148:  * there will have precedence.  Otherwise, the server address is set to
                    149:  * INADDR_ANY and the default domain name comes from the gethostname().
                    150:  *
                    151:  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
                    152:  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
                    153:  * since it was noted that INADDR_ANY actually meant ``the first interface
                    154:  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
                    155:  * it had to be "up" in order for you to reach your own name server.  It
                    156:  * was later decided that since the recommended practice is to always
                    157:  * install local static routes through 127.0.0.1 for all your network
                    158:  * interfaces, that we could solve this problem without a code change.
                    159:  *
                    160:  * The configuration file should always be used, since it is the only way
                    161:  * to specify a default domain.  If you are running a server on your local
                    162:  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
                    163:  * in the configuration file.
                    164:  *
                    165:  * Return 0 if completes successfully, -1 on error
                    166:  */
                    167: int
                    168: res_ninit(res_state statp) {
                    169:        extern int __res_vinit(res_state, int);
                    170:
                    171:        return (__res_vinit(statp, 0));
                    172: }
                    173:
1.9       christos  174: /*% This function has to be reachable by res_data.c but not publically. */
1.1       christos  175: int
                    176: __res_vinit(res_state statp, int preinit) {
                    177:        register FILE *fp;
                    178:        register char *cp, **pp;
                    179:        register int n;
                    180:        char buf[BUFSIZ];
1.9       christos  181:        int nserv = 0;    /*%< number of nameserver records read from file */
1.1       christos  182:        int haveenv = 0;
                    183:        int havesearch = 0;
                    184:        int nsort = 0;
                    185:        char *net;
                    186:        int dots;
                    187:        union res_sockaddr_union u[2];
                    188:
                    189:        if (!preinit) {
                    190:                statp->retrans = RES_TIMEOUT;
                    191:                statp->retry = RES_DFLRETRY;
                    192:                statp->options = RES_DEFAULT;
                    193:                statp->id = res_randomid();
                    194:        }
                    195:
1.12      christos  196:        if ((statp->options & RES_INIT) != 0U)
                    197:                res_ndestroy(statp);
                    198:
1.1       christos  199:        memset(u, 0, sizeof(u));
                    200: #ifdef USELOOPBACK
                    201:        u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
                    202: #else
                    203:        u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
                    204: #endif
                    205:        u[nserv].sin.sin_family = AF_INET;
                    206:        u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
                    207: #ifdef HAVE_SA_LEN
                    208:        u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
                    209: #endif
                    210:        nserv++;
                    211: #ifdef HAS_INET6_STRUCTS
                    212: #ifdef USELOOPBACK
                    213:        u[nserv].sin6.sin6_addr = in6addr_loopback;
                    214: #else
                    215:        u[nserv].sin6.sin6_addr = in6addr_any;
                    216: #endif
                    217:        u[nserv].sin6.sin6_family = AF_INET6;
                    218:        u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
                    219: #ifdef HAVE_SA_LEN
                    220:        u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
                    221: #endif
                    222:        nserv++;
                    223: #endif
                    224:        statp->nscount = 0;
                    225:        statp->ndots = 1;
                    226:        statp->pfcode = 0;
                    227:        statp->_vcsock = -1;
                    228:        statp->_flags = 0;
                    229:        statp->qhook = NULL;
                    230:        statp->rhook = NULL;
                    231:        statp->_u._ext.nscount = 0;
                    232:        statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
                    233:        if (statp->_u._ext.ext != NULL) {
                    234:                memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
                    235:                statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
                    236:                strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
                    237:                strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
1.9       christos  238:        } else
                    239:                return (-1);
1.1       christos  240:        statp->nsort = 0;
                    241:        res_setservers(statp, u, nserv);
                    242:
1.9       christos  243: #ifdef SOLARIS2
                    244:        /*
                    245:         * The old libresolv derived the defaultdomain from NIS/NIS+.
                    246:         * We want to keep this behaviour
                    247:         */
                    248:        {
                    249:                char buf[sizeof(statp->defdname)], *cp;
                    250:                int ret;
                    251:
                    252:                if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
                    253:                        (unsigned int)ret <= sizeof(buf)) {
                    254:                        if (buf[0] == '+')
                    255:                                buf[0] = '.';
                    256:                        cp = strchr(buf, '.');
                    257:                        cp = (cp == NULL) ? buf : (cp + 1);
                    258:                        if (strlen(cp) >= sizeof(statp->defdname))
                    259:                                goto freedata;
                    260:                        strcpy(statp->defdname, cp);
                    261:                }
                    262:        }
                    263: #endif /* SOLARIS2 */
                    264:
1.1       christos  265:        /* Allow user to override the local domain definition */
                    266:        if ((cp = getenv("LOCALDOMAIN")) != NULL) {
                    267:                (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
                    268:                statp->defdname[sizeof(statp->defdname) - 1] = '\0';
                    269:                haveenv++;
                    270:
                    271:                /*
                    272:                 * Set search list to be blank-separated strings
                    273:                 * from rest of env value.  Permits users of LOCALDOMAIN
                    274:                 * to still have a search list, and anyone to set the
                    275:                 * one that they want to use as an individual (even more
                    276:                 * important now that the rfc1535 stuff restricts searches)
                    277:                 */
                    278:                cp = statp->defdname;
                    279:                pp = statp->dnsrch;
                    280:                *pp++ = cp;
                    281:                for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
1.9       christos  282:                        if (*cp == '\n')        /*%< silly backwards compat */
1.1       christos  283:                                break;
                    284:                        else if (*cp == ' ' || *cp == '\t') {
                    285:                                *cp = 0;
                    286:                                n = 1;
                    287:                        } else if (n) {
                    288:                                *pp++ = cp;
                    289:                                n = 0;
                    290:                                havesearch = 1;
                    291:                        }
                    292:                }
                    293:                /* null terminate last domain if there are excess */
                    294:                while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
                    295:                        cp++;
                    296:                *cp = '\0';
                    297:                *pp++ = 0;
                    298:        }
                    299:
                    300: #define        MATCH(line, name) \
                    301:        (!strncmp(line, name, sizeof(name) - 1) && \
                    302:        (line[sizeof(name) - 1] == ' ' || \
                    303:         line[sizeof(name) - 1] == '\t'))
                    304:
                    305:        nserv = 0;
                    306:        if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
                    307:            /* read the config file */
                    308:            while (fgets(buf, sizeof(buf), fp) != NULL) {
                    309:                /* skip comments */
                    310:                if (*buf == ';' || *buf == '#')
                    311:                        continue;
                    312:                /* read default domain name */
                    313:                if (MATCH(buf, "domain")) {
1.9       christos  314:                    if (haveenv)        /*%< skip if have from environ */
1.1       christos  315:                            continue;
                    316:                    cp = buf + sizeof("domain") - 1;
                    317:                    while (*cp == ' ' || *cp == '\t')
                    318:                            cp++;
                    319:                    if ((*cp == '\0') || (*cp == '\n'))
                    320:                            continue;
                    321:                    strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
                    322:                    statp->defdname[sizeof(statp->defdname) - 1] = '\0';
                    323:                    if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
                    324:                            *cp = '\0';
                    325:                    havesearch = 0;
                    326:                    continue;
                    327:                }
                    328:                /* set search list */
                    329:                if (MATCH(buf, "search")) {
1.9       christos  330:                    if (haveenv)        /*%< skip if have from environ */
1.1       christos  331:                            continue;
                    332:                    cp = buf + sizeof("search") - 1;
                    333:                    while (*cp == ' ' || *cp == '\t')
                    334:                            cp++;
                    335:                    if ((*cp == '\0') || (*cp == '\n'))
                    336:                            continue;
                    337:                    strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
                    338:                    statp->defdname[sizeof(statp->defdname) - 1] = '\0';
                    339:                    if ((cp = strchr(statp->defdname, '\n')) != NULL)
                    340:                            *cp = '\0';
                    341:                    /*
                    342:                     * Set search list to be blank-separated strings
                    343:                     * on rest of line.
                    344:                     */
                    345:                    cp = statp->defdname;
                    346:                    pp = statp->dnsrch;
                    347:                    *pp++ = cp;
                    348:                    for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
                    349:                            if (*cp == ' ' || *cp == '\t') {
                    350:                                    *cp = 0;
                    351:                                    n = 1;
                    352:                            } else if (n) {
                    353:                                    *pp++ = cp;
                    354:                                    n = 0;
                    355:                            }
                    356:                    }
                    357:                    /* null terminate last domain if there are excess */
                    358:                    while (*cp != '\0' && *cp != ' ' && *cp != '\t')
                    359:                            cp++;
                    360:                    *cp = '\0';
                    361:                    *pp++ = 0;
                    362:                    havesearch = 1;
                    363:                    continue;
                    364:                }
                    365:                /* read nameservers to query */
                    366:                if (MATCH(buf, "nameserver") && nserv < MAXNS) {
                    367:                    struct addrinfo hints, *ai;
                    368:                    char sbuf[NI_MAXSERV];
                    369:                    const size_t minsiz =
                    370:                        sizeof(statp->_u._ext.ext->nsaddrs[0]);
                    371:
                    372:                    cp = buf + sizeof("nameserver") - 1;
                    373:                    while (*cp == ' ' || *cp == '\t')
                    374:                        cp++;
                    375:                    cp[strcspn(cp, ";# \t\n")] = '\0';
                    376:                    if ((*cp != '\0') && (*cp != '\n')) {
                    377:                        memset(&hints, 0, sizeof(hints));
                    378:                        hints.ai_family = PF_UNSPEC;
                    379:                        hints.ai_socktype = SOCK_DGRAM; /*dummy*/
                    380:                        hints.ai_flags = AI_NUMERICHOST;
                    381:                        sprintf(sbuf, "%u", NAMESERVER_PORT);
                    382:                        if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
                    383:                            ai->ai_addrlen <= minsiz) {
                    384:                            if (statp->_u._ext.ext != NULL) {
                    385:                                memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
                    386:                                    ai->ai_addr, ai->ai_addrlen);
                    387:                            }
                    388:                            if (ai->ai_addrlen <=
                    389:                                sizeof(statp->nsaddr_list[nserv])) {
                    390:                                memcpy(&statp->nsaddr_list[nserv],
                    391:                                    ai->ai_addr, ai->ai_addrlen);
                    392:                            } else
                    393:                                statp->nsaddr_list[nserv].sin_family = 0;
                    394:                            freeaddrinfo(ai);
                    395:                            nserv++;
                    396:                        }
                    397:                    }
                    398:                    continue;
                    399:                }
                    400:                if (MATCH(buf, "sortlist")) {
                    401:                    struct in_addr a;
                    402:
                    403:                    cp = buf + sizeof("sortlist") - 1;
                    404:                    while (nsort < MAXRESOLVSORT) {
                    405:                        while (*cp == ' ' || *cp == '\t')
                    406:                            cp++;
                    407:                        if (*cp == '\0' || *cp == '\n' || *cp == ';')
                    408:                            break;
                    409:                        net = cp;
                    410:                        while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
                    411:                               isascii(*cp) && !isspace((unsigned char)*cp))
                    412:                                cp++;
                    413:                        n = *cp;
                    414:                        *cp = 0;
                    415:                        if (inet_aton(net, &a)) {
                    416:                            statp->sort_list[nsort].addr = a;
                    417:                            if (ISSORTMASK(n)) {
                    418:                                *cp++ = n;
                    419:                                net = cp;
                    420:                                while (*cp && *cp != ';' &&
                    421:                                        isascii(*cp) &&
                    422:                                        !isspace((unsigned char)*cp))
                    423:                                    cp++;
                    424:                                n = *cp;
                    425:                                *cp = 0;
                    426:                                if (inet_aton(net, &a)) {
                    427:                                    statp->sort_list[nsort].mask = a.s_addr;
                    428:                                } else {
                    429:                                    statp->sort_list[nsort].mask =
                    430:                                        net_mask(statp->sort_list[nsort].addr);
                    431:                                }
                    432:                            } else {
                    433:                                statp->sort_list[nsort].mask =
                    434:                                    net_mask(statp->sort_list[nsort].addr);
                    435:                            }
                    436:                            nsort++;
                    437:                        }
                    438:                        *cp = n;
                    439:                    }
                    440:                    continue;
                    441:                }
                    442:                if (MATCH(buf, "options")) {
                    443:                    res_setoptions(statp, buf + sizeof("options") - 1, "conf");
                    444:                    continue;
                    445:                }
                    446:            }
                    447:            if (nserv > 0)
                    448:                statp->nscount = nserv;
                    449:            statp->nsort = nsort;
                    450:            (void) fclose(fp);
                    451:        }
                    452: /*
                    453:  * Last chance to get a nameserver.  This should not normally
                    454:  * be necessary
                    455:  */
                    456: #ifdef NO_RESOLV_CONF
                    457:        if(nserv == 0)
                    458:                nserv = get_nameservers(statp);
                    459: #endif
                    460:
                    461:        if (statp->defdname[0] == 0 &&
                    462:            gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
                    463:            (cp = strchr(buf, '.')) != NULL)
                    464:                strcpy(statp->defdname, cp + 1);
                    465:
                    466:        /* find components of local domain that might be searched */
                    467:        if (havesearch == 0) {
                    468:                pp = statp->dnsrch;
                    469:                *pp++ = statp->defdname;
                    470:                *pp = NULL;
                    471:
                    472:                dots = 0;
                    473:                for (cp = statp->defdname; *cp; cp++)
                    474:                        dots += (*cp == '.');
                    475:
                    476:                cp = statp->defdname;
                    477:                while (pp < statp->dnsrch + MAXDFLSRCH) {
                    478:                        if (dots < LOCALDOMAINPARTS)
                    479:                                break;
1.9       christos  480:                        cp = strchr(cp, '.') + 1;    /*%< we know there is one */
1.1       christos  481:                        *pp++ = cp;
                    482:                        dots--;
                    483:                }
                    484:                *pp = NULL;
                    485: #ifdef DEBUG
                    486:                if (statp->options & RES_DEBUG) {
                    487:                        printf(";; res_init()... default dnsrch list:\n");
                    488:                        for (pp = statp->dnsrch; *pp; pp++)
                    489:                                printf(";;\t%s\n", *pp);
                    490:                        printf(";;\t..END..\n");
                    491:                }
                    492: #endif
                    493:        }
                    494:
                    495:        if ((cp = getenv("RES_OPTIONS")) != NULL)
                    496:                res_setoptions(statp, cp, "env");
                    497:        statp->options |= RES_INIT;
                    498:        return (0);
1.9       christos  499:
                    500: #ifdef SOLARIS2
                    501:  freedata:
                    502:        if (statp->_u._ext.ext != NULL) {
                    503:                free(statp->_u._ext.ext);
                    504:                statp->_u._ext.ext = NULL;
                    505:        }
                    506:        return (-1);
                    507: #endif
1.1       christos  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:        struct __res_state_ext *ext = statp->_u._ext.ext;
                    516:
                    517: #ifdef DEBUG
                    518:        if (statp->options & RES_DEBUG)
                    519:                printf(";; res_setoptions(\"%s\", \"%s\")...\n",
                    520:                       options, source);
                    521: #endif
                    522:        while (*cp) {
                    523:                /* skip leading and inner runs of spaces */
                    524:                while (*cp == ' ' || *cp == '\t')
                    525:                        cp++;
                    526:                /* search for and process individual options */
                    527:                if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
                    528:                        i = atoi(cp + sizeof("ndots:") - 1);
                    529:                        if (i <= RES_MAXNDOTS)
                    530:                                statp->ndots = i;
                    531:                        else
                    532:                                statp->ndots = RES_MAXNDOTS;
                    533: #ifdef DEBUG
                    534:                        if (statp->options & RES_DEBUG)
                    535:                                printf(";;\tndots=%d\n", statp->ndots);
                    536: #endif
                    537:                } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
                    538:                        i = atoi(cp + sizeof("timeout:") - 1);
                    539:                        if (i <= RES_MAXRETRANS)
                    540:                                statp->retrans = i;
                    541:                        else
                    542:                                statp->retrans = RES_MAXRETRANS;
                    543: #ifdef DEBUG
                    544:                        if (statp->options & RES_DEBUG)
                    545:                                printf(";;\ttimeout=%d\n", statp->retrans);
                    546: #endif
1.9       christos  547: #ifdef SOLARIS2
                    548:                } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
                    549:                        /*
                    550:                         * For backward compatibility, 'retrans' is
                    551:                         * supported as an alias for 'timeout', though
                    552:                         * without an imposed maximum.
                    553:                         */
                    554:                        statp->retrans = atoi(cp + sizeof("retrans:") - 1);
                    555:                } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
                    556:                        /*
                    557:                         * For backward compatibility, 'retry' is
                    558:                         * supported as an alias for 'attempts', though
                    559:                         * without an imposed maximum.
                    560:                         */
                    561:                        statp->retry = atoi(cp + sizeof("retry:") - 1);
                    562: #endif /* SOLARIS2 */
1.1       christos  563:                } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
                    564:                        i = atoi(cp + sizeof("attempts:") - 1);
                    565:                        if (i <= RES_MAXRETRY)
                    566:                                statp->retry = i;
                    567:                        else
                    568:                                statp->retry = RES_MAXRETRY;
                    569: #ifdef DEBUG
                    570:                        if (statp->options & RES_DEBUG)
                    571:                                printf(";;\tattempts=%d\n", statp->retry);
                    572: #endif
                    573:                } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
                    574: #ifdef DEBUG
                    575:                        if (!(statp->options & RES_DEBUG)) {
                    576:                                printf(";; res_setoptions(\"%s\", \"%s\")..\n",
                    577:                                       options, source);
                    578:                                statp->options |= RES_DEBUG;
                    579:                        }
                    580:                        printf(";;\tdebug\n");
                    581: #endif
                    582:                } else if (!strncmp(cp, "no_tld_query",
                    583:                                    sizeof("no_tld_query") - 1) ||
                    584:                           !strncmp(cp, "no-tld-query",
                    585:                                    sizeof("no-tld-query") - 1)) {
                    586:                        statp->options |= RES_NOTLDQUERY;
                    587:                } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
                    588:                        statp->options |= RES_USE_INET6;
                    589:                } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
                    590:                        statp->options |= RES_ROTATE;
                    591:                } else if (!strncmp(cp, "no-check-names",
                    592:                                    sizeof("no-check-names") - 1)) {
                    593:                        statp->options |= RES_NOCHECKNAME;
                    594:                }
                    595: #ifdef RES_USE_EDNS0
                    596:                else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
                    597:                        statp->options |= RES_USE_EDNS0;
                    598:                }
                    599: #endif
                    600:                else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
                    601:                        statp->options |= RES_USE_DNAME;
                    602:                }
                    603:                else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
                    604:                        if (ext == NULL)
                    605:                                goto skip;
                    606:                        cp += sizeof("nibble:") - 1;
                    607:                        i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
1.2       christos  608:                        strncpy(ext->nsuffix, cp, (size_t)i);
1.1       christos  609:                        ext->nsuffix[i] = '\0';
                    610:                }
                    611:                else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
                    612:                        if (ext == NULL)
                    613:                                goto skip;
                    614:                        cp += sizeof("nibble2:") - 1;
                    615:                        i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
1.2       christos  616:                        strncpy(ext->nsuffix2, cp, (size_t)i);
1.1       christos  617:                        ext->nsuffix2[i] = '\0';
                    618:                }
                    619:                else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
                    620:                        cp += sizeof("v6revmode:") - 1;
                    621:                        /* "nibble" and "bitstring" used to be valid */
                    622:                        if (!strncmp(cp, "single", sizeof("single") - 1)) {
                    623:                                statp->options |= RES_NO_NIBBLE2;
                    624:                        } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
                    625:                                statp->options &=
                    626:                                         ~RES_NO_NIBBLE2;
                    627:                        }
                    628:                }
                    629:                else {
                    630:                        /* XXX - print a warning here? */
                    631:                }
                    632:    skip:
                    633:                /* skip to next run of spaces */
                    634:                while (*cp && *cp != ' ' && *cp != '\t')
                    635:                        cp++;
                    636:        }
                    637: }
                    638:
                    639: /* XXX - should really support CIDR which means explicit masks always. */
                    640: static u_int32_t
1.9       christos  641: net_mask(in)           /*!< XXX - should really use system's version of this  */
1.1       christos  642:        struct in_addr in;
                    643: {
                    644:        register u_int32_t i = ntohl(in.s_addr);
                    645:
                    646:        if (IN_CLASSA(i))
                    647:                return (htonl(IN_CLASSA_NET));
                    648:        else if (IN_CLASSB(i))
                    649:                return (htonl(IN_CLASSB_NET));
                    650:        return (htonl(IN_CLASSC_NET));
                    651: }
                    652:
                    653: u_int
                    654: res_randomid(void) {
                    655:        struct timeval now;
                    656:
                    657:        gettimeofday(&now, NULL);
                    658:        return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
                    659: }
                    660:
1.9       christos  661: /*%
1.1       christos  662:  * This routine is for closing the socket if a virtual circuit is used and
                    663:  * the program wants to close it.  This provides support for endhostent()
                    664:  * which expects to close the socket.
                    665:  *
                    666:  * This routine is not expected to be user visible.
                    667:  */
                    668: void
                    669: res_nclose(res_state statp) {
                    670:        int ns;
                    671:
                    672:        if (statp->_vcsock >= 0) {
                    673:                (void) close(statp->_vcsock);
                    674:                statp->_vcsock = -1;
                    675:                statp->_flags &= ~(RES_F_VC | RES_F_CONN);
                    676:        }
                    677:        for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
                    678:                if (statp->_u._ext.nssocks[ns] != -1) {
                    679:                        (void) close(statp->_u._ext.nssocks[ns]);
                    680:                        statp->_u._ext.nssocks[ns] = -1;
                    681:                }
                    682:        }
                    683: }
                    684:
                    685: void
                    686: res_ndestroy(res_state statp) {
                    687:        res_nclose(statp);
                    688:        if (statp->_u._ext.ext != NULL)
                    689:                free(statp->_u._ext.ext);
                    690:        statp->options &= ~RES_INIT;
                    691:        statp->_u._ext.ext = NULL;
                    692: }
                    693:
                    694: const char *
                    695: res_get_nibblesuffix(res_state statp) {
                    696:        if (statp->_u._ext.ext)
                    697:                return (statp->_u._ext.ext->nsuffix);
                    698:        return ("ip6.arpa");
                    699: }
                    700:
                    701: const char *
                    702: res_get_nibblesuffix2(res_state statp) {
                    703:        if (statp->_u._ext.ext)
                    704:                return (statp->_u._ext.ext->nsuffix2);
                    705:        return ("ip6.int");
                    706: }
                    707:
                    708: void
                    709: res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
                    710:        int i, nserv;
                    711:        size_t size;
                    712:
                    713:        /* close open servers */
                    714:        res_nclose(statp);
                    715:
                    716:        /* cause rtt times to be forgotten */
                    717:        statp->_u._ext.nscount = 0;
                    718:
                    719:        nserv = 0;
                    720:        for (i = 0; i < cnt && nserv < MAXNS; i++) {
                    721:                switch (set->sin.sin_family) {
                    722:                case AF_INET:
                    723:                        size = sizeof(set->sin);
                    724:                        if (statp->_u._ext.ext)
                    725:                                memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
                    726:                                        &set->sin, size);
                    727:                        if (size <= sizeof(statp->nsaddr_list[nserv]))
                    728:                                memcpy(&statp->nsaddr_list[nserv],
                    729:                                        &set->sin, size);
1.8       christos  730: #ifdef notdef
1.1       christos  731:                        else
                    732:                                statp->nsaddr_list[nserv].sin_family = 0;
1.8       christos  733: #endif
1.1       christos  734:                        nserv++;
                    735:                        break;
                    736:
                    737: #ifdef HAS_INET6_STRUCTS
                    738:                case AF_INET6:
                    739:                        size = sizeof(set->sin6);
                    740:                        if (statp->_u._ext.ext)
                    741:                                memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
                    742:                                        &set->sin6, size);
                    743:                        if (size <= sizeof(statp->nsaddr_list[nserv]))
                    744:                                memcpy(&statp->nsaddr_list[nserv],
                    745:                                        &set->sin6, size);
                    746:                        else
                    747:                                statp->nsaddr_list[nserv].sin_family = 0;
                    748:                        nserv++;
                    749:                        break;
                    750: #endif
                    751:
                    752:                default:
                    753:                        break;
                    754:                }
                    755:                set++;
                    756:        }
                    757:        statp->nscount = nserv;
                    758:
                    759: }
                    760:
                    761: int
                    762: res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
                    763:        int i;
                    764:        size_t size;
                    765:        u_int16_t family;
                    766:
                    767:        for (i = 0; i < statp->nscount && i < cnt; i++) {
                    768:                if (statp->_u._ext.ext)
                    769:                        family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
                    770:                else
                    771:                        family = statp->nsaddr_list[i].sin_family;
                    772:
                    773:                switch (family) {
                    774:                case AF_INET:
                    775:                        size = sizeof(set->sin);
                    776:                        if (statp->_u._ext.ext)
                    777:                                memcpy(&set->sin,
                    778:                                       &statp->_u._ext.ext->nsaddrs[i],
                    779:                                       size);
                    780:                        else
                    781:                                memcpy(&set->sin, &statp->nsaddr_list[i],
                    782:                                       size);
                    783:                        break;
                    784:
                    785: #ifdef HAS_INET6_STRUCTS
                    786:                case AF_INET6:
                    787:                        size = sizeof(set->sin6);
                    788:                        if (statp->_u._ext.ext)
                    789:                                memcpy(&set->sin6,
                    790:                                       &statp->_u._ext.ext->nsaddrs[i],
                    791:                                       size);
                    792:                        else
                    793:                                memcpy(&set->sin6, &statp->nsaddr_list[i],
                    794:                                       size);
                    795:                        break;
                    796: #endif
                    797:
                    798:                default:
                    799:                        set->sin.sin_family = 0;
                    800:                        break;
                    801:                }
                    802:                set++;
                    803:        }
                    804:        return (statp->nscount);
                    805: }
1.9       christos  806:
                    807: /*! \file */

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