diff options
Diffstat (limited to 'contrib/bind9/lib/bind/resolv/res_init.c')
| -rw-r--r-- | contrib/bind9/lib/bind/resolv/res_init.c | 740 |
1 files changed, 740 insertions, 0 deletions
diff --git a/contrib/bind9/lib/bind/resolv/res_init.c b/contrib/bind9/lib/bind/resolv/res_init.c new file mode 100644 index 000000000000..241f5f7cbf3f --- /dev/null +++ b/contrib/bind9/lib/bind/resolv/res_init.c @@ -0,0 +1,740 @@ +/* + * Copyright (c) 1985, 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * Portions Copyright (c) 1993 by Digital Equipment Corporation. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies, and that + * the name of Digital Equipment Corporation not be used in advertising or + * publicity pertaining to distribution of the document or software without + * specific, written prior permission. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL + * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT + * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL + * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR + * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS + * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS + * SOFTWARE. + */ + +/* + * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") + * Portions Copyright (c) 1996-1999 by Internet Software Consortium. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT + * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; +static const char rcsid[] = "$Id: res_init.c,v 1.9.2.5.4.2 2004/03/16 12:34:18 marka Exp $"; +#endif /* LIBC_SCCS and not lint */ + +#include "port_before.h" + +#include <sys/types.h> +#include <sys/param.h> +#include <sys/socket.h> +#include <sys/time.h> + +#include <netinet/in.h> +#include <arpa/inet.h> +#include <arpa/nameser.h> + +#include <ctype.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <netdb.h> + +#include "port_after.h" + +/* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ +#include <resolv.h> + +#include "res_private.h" + +/* Options. Should all be left alone. */ +#define RESOLVSORT +#define DEBUG + +static void res_setoptions __P((res_state, const char *, const char *)); + +#ifdef RESOLVSORT +static const char sort_mask[] = "/&"; +#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) +static u_int32_t net_mask __P((struct in_addr)); +#endif + +#if !defined(isascii) /* XXX - could be a function */ +# define isascii(c) (!(c & 0200)) +#endif + +/* + * Resolver state default settings. + */ + +/* + * Set up default settings. If the configuration file exist, the values + * there will have precedence. Otherwise, the server address is set to + * INADDR_ANY and the default domain name comes from the gethostname(). + * + * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 + * rather than INADDR_ANY ("0.0.0.0") as the default name server address + * since it was noted that INADDR_ANY actually meant ``the first interface + * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, + * it had to be "up" in order for you to reach your own name server. It + * was later decided that since the recommended practice is to always + * install local static routes through 127.0.0.1 for all your network + * interfaces, that we could solve this problem without a code change. + * + * The configuration file should always be used, since it is the only way + * to specify a default domain. If you are running a server on your local + * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" + * in the configuration file. + * + * Return 0 if completes successfully, -1 on error + */ +int +res_ninit(res_state statp) { + extern int __res_vinit(res_state, int); + + return (__res_vinit(statp, 0)); +} + +/* This function has to be reachable by res_data.c but not publically. */ +int +__res_vinit(res_state statp, int preinit) { + register FILE *fp; + register char *cp, **pp; + register int n; + char buf[BUFSIZ]; + int nserv = 0; /* number of nameserver records read from file */ + int haveenv = 0; + int havesearch = 0; +#ifdef RESOLVSORT + int nsort = 0; + char *net; +#endif + int dots; + union res_sockaddr_union u[2]; + + if (!preinit) { + statp->retrans = RES_TIMEOUT; + statp->retry = RES_DFLRETRY; + statp->options = RES_DEFAULT; + statp->id = res_randomid(); + } + + if ((statp->options & RES_INIT) != 0U) + res_ndestroy(statp); + + memset(u, 0, sizeof(u)); +#ifdef USELOOPBACK + u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); +#else + u[nserv].sin.sin_addr.s_addr = INADDR_ANY; +#endif + u[nserv].sin.sin_family = AF_INET; + u[nserv].sin.sin_port = htons(NAMESERVER_PORT); +#ifdef HAVE_SA_LEN + u[nserv].sin.sin_len = sizeof(struct sockaddr_in); +#endif + nserv++; +#ifdef HAS_INET6_STRUCTS +#ifdef USELOOPBACK + u[nserv].sin6.sin6_addr = in6addr_loopback; +#else + u[nserv].sin6.sin6_addr = in6addr_any; +#endif + u[nserv].sin6.sin6_family = AF_INET6; + u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); +#ifdef HAVE_SA_LEN + u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); +#endif + nserv++; +#endif + statp->nscount = 0; + statp->ndots = 1; + statp->pfcode = 0; + statp->_vcsock = -1; + statp->_flags = 0; + statp->qhook = NULL; + statp->rhook = NULL; + statp->_u._ext.nscount = 0; + statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); + if (statp->_u._ext.ext != NULL) { + memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); + statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; + strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); + strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); + } +#ifdef RESOLVSORT + statp->nsort = 0; +#endif + res_setservers(statp, u, nserv); + + /* Allow user to override the local domain definition */ + if ((cp = getenv("LOCALDOMAIN")) != NULL) { + (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); + statp->defdname[sizeof(statp->defdname) - 1] = '\0'; + haveenv++; + + /* + * Set search list to be blank-separated strings + * from rest of env value. Permits users of LOCALDOMAIN + * to still have a search list, and anyone to set the + * one that they want to use as an individual (even more + * important now that the rfc1535 stuff restricts searches) + */ + cp = statp->defdname; + pp = statp->dnsrch; + *pp++ = cp; + for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { + if (*cp == '\n') /* silly backwards compat */ + break; + else if (*cp == ' ' || *cp == '\t') { + *cp = 0; + n = 1; + } else if (n) { + *pp++ = cp; + n = 0; + havesearch = 1; + } + } + /* null terminate last domain if there are excess */ + while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') + cp++; + *cp = '\0'; + *pp++ = 0; + } + +#define MATCH(line, name) \ + (!strncmp(line, name, sizeof(name) - 1) && \ + (line[sizeof(name) - 1] == ' ' || \ + line[sizeof(name) - 1] == '\t')) + + nserv = 0; + if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { + /* read the config file */ + while (fgets(buf, sizeof(buf), fp) != NULL) { + /* skip comments */ + if (*buf == ';' || *buf == '#') + continue; + /* read default domain name */ + if (MATCH(buf, "domain")) { + if (haveenv) /* skip if have from environ */ + continue; + cp = buf + sizeof("domain") - 1; + while (*cp == ' ' || *cp == '\t') + cp++; + if ((*cp == '\0') || (*cp == '\n')) + continue; + strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); + statp->defdname[sizeof(statp->defdname) - 1] = '\0'; + if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) + *cp = '\0'; + havesearch = 0; + continue; + } + /* set search list */ + if (MATCH(buf, "search")) { + if (haveenv) /* skip if have from environ */ + continue; + cp = buf + sizeof("search") - 1; + while (*cp == ' ' || *cp == '\t') + cp++; + if ((*cp == '\0') || (*cp == '\n')) + continue; + strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); + statp->defdname[sizeof(statp->defdname) - 1] = '\0'; + if ((cp = strchr(statp->defdname, '\n')) != NULL) + *cp = '\0'; + /* + * Set search list to be blank-separated strings + * on rest of line. + */ + cp = statp->defdname; + pp = statp->dnsrch; + *pp++ = cp; + for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { + if (*cp == ' ' || *cp == '\t') { + *cp = 0; + n = 1; + } else if (n) { + *pp++ = cp; + n = 0; + } + } + /* null terminate last domain if there are excess */ + while (*cp != '\0' && *cp != ' ' && *cp != '\t') + cp++; + *cp = '\0'; + *pp++ = 0; + havesearch = 1; + continue; + } + /* read nameservers to query */ + if (MATCH(buf, "nameserver") && nserv < MAXNS) { + struct addrinfo hints, *ai; + char sbuf[NI_MAXSERV]; + const size_t minsiz = + sizeof(statp->_u._ext.ext->nsaddrs[0]); + + cp = buf + sizeof("nameserver") - 1; + while (*cp == ' ' || *cp == '\t') + cp++; + cp[strcspn(cp, ";# \t\n")] = '\0'; + if ((*cp != '\0') && (*cp != '\n')) { + memset(&hints, 0, sizeof(hints)); + hints.ai_family = PF_UNSPEC; + hints.ai_socktype = SOCK_DGRAM; /*dummy*/ + hints.ai_flags = AI_NUMERICHOST; + sprintf(sbuf, "%u", NAMESERVER_PORT); + if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && + ai->ai_addrlen <= minsiz) { + if (statp->_u._ext.ext != NULL) { + memcpy(&statp->_u._ext.ext->nsaddrs[nserv], + ai->ai_addr, ai->ai_addrlen); + } + if (ai->ai_addrlen <= + sizeof(statp->nsaddr_list[nserv])) { + memcpy(&statp->nsaddr_list[nserv], + ai->ai_addr, ai->ai_addrlen); + } else + statp->nsaddr_list[nserv].sin_family = 0; + freeaddrinfo(ai); + nserv++; + } + } + continue; + } +#ifdef RESOLVSORT + if (MATCH(buf, "sortlist")) { + struct in_addr a; + + cp = buf + sizeof("sortlist") - 1; + while (nsort < MAXRESOLVSORT) { + while (*cp == ' ' || *cp == '\t') + cp++; + if (*cp == '\0' || *cp == '\n' || *cp == ';') + break; + net = cp; + while (*cp && !ISSORTMASK(*cp) && *cp != ';' && + isascii(*cp) && !isspace((unsigned char)*cp)) + cp++; + n = *cp; + *cp = 0; + if (inet_aton(net, &a)) { + statp->sort_list[nsort].addr = a; + if (ISSORTMASK(n)) { + *cp++ = n; + net = cp; + while (*cp && *cp != ';' && + isascii(*cp) && + !isspace((unsigned char)*cp)) + cp++; + n = *cp; + *cp = 0; + if (inet_aton(net, &a)) { + statp->sort_list[nsort].mask = a.s_addr; + } else { + statp->sort_list[nsort].mask = + net_mask(statp->sort_list[nsort].addr); + } + } else { + statp->sort_list[nsort].mask = + net_mask(statp->sort_list[nsort].addr); + } + nsort++; + } + *cp = n; + } + continue; + } +#endif + if (MATCH(buf, "options")) { + res_setoptions(statp, buf + sizeof("options") - 1, "conf"); + continue; + } + } + if (nserv > 0) + statp->nscount = nserv; +#ifdef RESOLVSORT + statp->nsort = nsort; +#endif + (void) fclose(fp); + } +/* + * Last chance to get a nameserver. This should not normally + * be necessary + */ +#ifdef NO_RESOLV_CONF + if(nserv == 0) + nserv = get_nameservers(statp); +#endif + + if (statp->defdname[0] == 0 && + gethostname(buf, sizeof(statp->defdname) - 1) == 0 && + (cp = strchr(buf, '.')) != NULL) + strcpy(statp->defdname, cp + 1); + + /* find components of local domain that might be searched */ + if (havesearch == 0) { + pp = statp->dnsrch; + *pp++ = statp->defdname; + *pp = NULL; + + dots = 0; + for (cp = statp->defdname; *cp; cp++) + dots += (*cp == '.'); + + cp = statp->defdname; + while (pp < statp->dnsrch + MAXDFLSRCH) { + if (dots < LOCALDOMAINPARTS) + break; + cp = strchr(cp, '.') + 1; /* we know there is one */ + *pp++ = cp; + dots--; + } + *pp = NULL; +#ifdef DEBUG + if (statp->options & RES_DEBUG) { + printf(";; res_init()... default dnsrch list:\n"); + for (pp = statp->dnsrch; *pp; pp++) + printf(";;\t%s\n", *pp); + printf(";;\t..END..\n"); + } +#endif + } + + if ((cp = getenv("RES_OPTIONS")) != NULL) + res_setoptions(statp, cp, "env"); + statp->options |= RES_INIT; + return (0); +} + +static void +res_setoptions(res_state statp, const char *options, const char *source) +{ + const char *cp = options; + int i; + struct __res_state_ext *ext = statp->_u._ext.ext; + +#ifdef DEBUG + if (statp->options & RES_DEBUG) + printf(";; res_setoptions(\"%s\", \"%s\")...\n", + options, source); +#endif + while (*cp) { + /* skip leading and inner runs of spaces */ + while (*cp == ' ' || *cp == '\t') + cp++; + /* search for and process individual options */ + if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { + i = atoi(cp + sizeof("ndots:") - 1); + if (i <= RES_MAXNDOTS) + statp->ndots = i; + else + statp->ndots = RES_MAXNDOTS; +#ifdef DEBUG + if (statp->options & RES_DEBUG) + printf(";;\tndots=%d\n", statp->ndots); +#endif + } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { + i = atoi(cp + sizeof("timeout:") - 1); + if (i <= RES_MAXRETRANS) + statp->retrans = i; + else + statp->retrans = RES_MAXRETRANS; +#ifdef DEBUG + if (statp->options & RES_DEBUG) + printf(";;\ttimeout=%d\n", statp->retrans); +#endif + } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ + i = atoi(cp + sizeof("attempts:") - 1); + if (i <= RES_MAXRETRY) + statp->retry = i; + else + statp->retry = RES_MAXRETRY; +#ifdef DEBUG + if (statp->options & RES_DEBUG) + printf(";;\tattempts=%d\n", statp->retry); +#endif + } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { +#ifdef DEBUG + if (!(statp->options & RES_DEBUG)) { + printf(";; res_setoptions(\"%s\", \"%s\")..\n", + options, source); + statp->options |= RES_DEBUG; + } + printf(";;\tdebug\n"); +#endif + } else if (!strncmp(cp, "no_tld_query", + sizeof("no_tld_query") - 1) || + !strncmp(cp, "no-tld-query", + sizeof("no-tld-query") - 1)) { + statp->options |= RES_NOTLDQUERY; + } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { + statp->options |= RES_USE_INET6; + } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { + statp->options |= RES_ROTATE; + } else if (!strncmp(cp, "no-check-names", + sizeof("no-check-names") - 1)) { + statp->options |= RES_NOCHECKNAME; + } +#ifdef RES_USE_EDNS0 + else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { + statp->options |= RES_USE_EDNS0; + } +#endif + else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { + statp->options |= RES_USE_DNAME; + } + else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { + if (ext == NULL) + goto skip; + cp += sizeof("nibble:") - 1; + i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); + strncpy(ext->nsuffix, cp, i); + ext->nsuffix[i] = '\0'; + } + else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { + if (ext == NULL) + goto skip; + cp += sizeof("nibble2:") - 1; + i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); + strncpy(ext->nsuffix2, cp, i); + ext->nsuffix2[i] = '\0'; + } + else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { + cp += sizeof("v6revmode:") - 1; + /* "nibble" and "bitstring" used to be valid */ + if (!strncmp(cp, "single", sizeof("single") - 1)) { + statp->options |= RES_NO_NIBBLE2; + } else if (!strncmp(cp, "both", sizeof("both") - 1)) { + statp->options &= + ~RES_NO_NIBBLE2; + } + } + else { + /* XXX - print a warning here? */ + } + skip: + /* skip to next run of spaces */ + while (*cp && *cp != ' ' && *cp != '\t') + cp++; + } +} + +#ifdef RESOLVSORT +/* XXX - should really support CIDR which means explicit masks always. */ +static u_int32_t +net_mask(in) /* XXX - should really use system's version of this */ + struct in_addr in; +{ + register u_int32_t i = ntohl(in.s_addr); + + if (IN_CLASSA(i)) + return (htonl(IN_CLASSA_NET)); + else if (IN_CLASSB(i)) + return (htonl(IN_CLASSB_NET)); + return (htonl(IN_CLASSC_NET)); +} +#endif + +u_int +res_randomid(void) { + struct timeval now; + + gettimeofday(&now, NULL); + return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); +} + +/* + * This routine is for closing the socket if a virtual circuit is used and + * the program wants to close it. This provides support for endhostent() + * which expects to close the socket. + * + * This routine is not expected to be user visible. + */ +void +res_nclose(res_state statp) { + int ns; + + if (statp->_vcsock >= 0) { + (void) close(statp->_vcsock); + statp->_vcsock = -1; + statp->_flags &= ~(RES_F_VC | RES_F_CONN); + } + for (ns = 0; ns < statp->_u._ext.nscount; ns++) { + if (statp->_u._ext.nssocks[ns] != -1) { + (void) close(statp->_u._ext.nssocks[ns]); + statp->_u._ext.nssocks[ns] = -1; + } + } +} + +void +res_ndestroy(res_state statp) { + res_nclose(statp); + if (statp->_u._ext.ext != NULL) + free(statp->_u._ext.ext); + statp->options &= ~RES_INIT; + statp->_u._ext.ext = NULL; +} + +const char * +res_get_nibblesuffix(res_state statp) { + if (statp->_u._ext.ext) + return (statp->_u._ext.ext->nsuffix); + return ("ip6.arpa"); +} + +const char * +res_get_nibblesuffix2(res_state statp) { + if (statp->_u._ext.ext) + return (statp->_u._ext.ext->nsuffix2); + return ("ip6.int"); +} + +void +res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { + int i, nserv; + size_t size; + + /* close open servers */ + res_nclose(statp); + + /* cause rtt times to be forgotten */ + statp->_u._ext.nscount = 0; + + nserv = 0; + for (i = 0; i < cnt && nserv < MAXNS; i++) { + switch (set->sin.sin_family) { + case AF_INET: + size = sizeof(set->sin); + if (statp->_u._ext.ext) + memcpy(&statp->_u._ext.ext->nsaddrs[nserv], + &set->sin, size); + if (size <= sizeof(statp->nsaddr_list[nserv])) + memcpy(&statp->nsaddr_list[nserv], + &set->sin, size); + else + statp->nsaddr_list[nserv].sin_family = 0; + nserv++; + break; + +#ifdef HAS_INET6_STRUCTS + case AF_INET6: + size = sizeof(set->sin6); + if (statp->_u._ext.ext) + memcpy(&statp->_u._ext.ext->nsaddrs[nserv], + &set->sin6, size); + if (size <= sizeof(statp->nsaddr_list[nserv])) + memcpy(&statp->nsaddr_list[nserv], + &set->sin6, size); + else + statp->nsaddr_list[nserv].sin_family = 0; + nserv++; + break; +#endif + + default: + break; + } + set++; + } + statp->nscount = nserv; + +} + +int +res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { + int i; + size_t size; + u_int16_t family; + + for (i = 0; i < statp->nscount && i < cnt; i++) { + if (statp->_u._ext.ext) + family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; + else + family = statp->nsaddr_list[i].sin_family; + + switch (family) { + case AF_INET: + size = sizeof(set->sin); + if (statp->_u._ext.ext) + memcpy(&set->sin, + &statp->_u._ext.ext->nsaddrs[i], + size); + else + memcpy(&set->sin, &statp->nsaddr_list[i], + size); + break; + +#ifdef HAS_INET6_STRUCTS + case AF_INET6: + size = sizeof(set->sin6); + if (statp->_u._ext.ext) + memcpy(&set->sin6, + &statp->_u._ext.ext->nsaddrs[i], + size); + else + memcpy(&set->sin6, &statp->nsaddr_list[i], + size); + break; +#endif + + default: + set->sin.sin_family = 0; + break; + } + set++; + } + return (statp->nscount); +} |