[apple/libresolv.git] / res_init.c

/*
 * 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.
 */

/*
 * 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM 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 1.1 2006/03/01 19:01:38 majka Exp $";
#endif /* LIBC_SCCS and not lint */

#ifndef __APPLE__
#include "port_before.h"
#endif

#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>
#ifdef __APPLE__
#include <fcntl.h>
#include <dnsinfo.h>
#endif

#ifndef __APPLE__
#include "port_after.h"
#endif

/* 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 *));
extern res_state res_state_new();

#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

#define INET_NTOP_AF_INET_OFFSET 4
#define INET_NTOP_AF_INET6_OFFSET 8

/*
 * Resolver state default settings.
 */

res_state 
res_build_start(res_state x)
{
        res_state res;
        int rf;

        res = NULL;

        if (x == NULL)
        {
                res = res_state_new();
        }
        else
        {
                if ((x->options & RES_INIT) != 0) res_ndestroy(x);
                res = x;
        }

        if (res == NULL) return NULL;

        /* res_ndestroy frees _u._ext.ext so we create a new one if necessary */
        if (res->_u._ext.ext == NULL) res->_u._ext.ext = (struct __res_state_ext *)calloc(1, sizeof(struct __res_state_ext));

        /* make sure version is set */
        res->_pad = 9;

        res->retry = RES_DFLRETRY;
        res->options = RES_DEFAULT;
        
        rf = open("/dev/random", O_RDONLY, 0);
        read(rf, &(res->id), 2);
        close(rf);
        
        res->ndots = 1;
        res->_vcsock = -1;

        if (res->_u._ext.ext != NULL)
        {
                strcpy(res->_u._ext.ext->nsuffix, "ip6.arpa");
                strcpy(res->_u._ext.ext->nsuffix2, "ip6.int");
                strcpy(res->_u._ext.ext->bsuffix, "ip6.arpa");
        }

        return res;
}

int
res_build_finish(res_state res, uint32_t timeout, uint16_t port)
{
        if (res == NULL) return -1;
        
        if (res->nscount == 0)
        {
#ifdef USELOOPBACK
                res->nsaddr_list[0].sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
#else
                res->nsaddr_list[0].sin_addr.s_addr = INADDR_ANY;
#endif
                
                res->nsaddr_list[0].sin_family = AF_INET;
                res->nsaddr_list[0].sin_port = htons(port);
#ifdef HAVE_SA_LEN
                res->nsaddr_list[0].sin_len = sizeof(struct sockaddr_in);
#endif
                
                res->nscount = 1;

                /*
                 * Force loopback queries to use TCP
                 * so we don't take a timeout if named isn't running.
                 */
                res->options |= RES_USEVC;
        }
        
        if (timeout == 0) res->retrans = RES_MAXRETRANS;
        else res->retrans = timeout;

        res->options |= RES_INIT;
        return 0;
}

int
res_build_sortlist(res_state res, struct in_addr addr, struct in_addr mask)
{
        uint32_t n;
        
        if (res == NULL) return -1;
        
        n = res->nsort;
        if (n >= MAXRESOLVSORT) return -1;
        
        res->sort_list[n].addr = addr;
        res->sort_list[n].mask = mask.s_addr;
        n++;
        res->nsort = n;
        
        return 0;
}

char *
res_next_word(char **p)
{
        char *s, *x;

        if (p == NULL) return NULL;
        if (*p == NULL) return NULL;

        s = *p;

        /* Skip leading white space */
        while ((*s == ' ') || (*s == '\t') || (*s == '\n')) s++;
        *p = s;

        if (*s == '\0') return NULL;

        /* Find end of word */
        x = s;
        while ((*x != ' ') && (*x != '\t') && (*x != '\n') && (*x != '\0')) x++;
        if (*x != '\0')
        {
                *x = '\0';
                x++;
        }

        *p = x;

        if (s == x) return NULL;
        return s;
}

int
res_build(res_state res, uint16_t port, uint32_t *nsrch, char *key, char *val)
{
        int32_t dotcount, semicount, status;
        int32_t ival, len;
        char *p, *lastdot;
        uint16_t aport;
        struct in_addr addr4, mask;
        struct sockaddr_in sin4;
        struct in6_addr addr6;
        struct sockaddr_in6 sin6;
                                
        if (res == NULL) return -1;     
        
        if (!strcmp(key, "domain"))
        {
                strncpy(res->defdname, val, sizeof(res->defdname) - 1);
                res->defdname[sizeof(res->defdname) - 1] = '\0';
                return 0;
        }

        else if (!strcmp(key, "search"))
        {
                len = strlen(val) + 1;
                ival = sizeof(res->defdname);
                p = res->defdname;

                if ((*nsrch) == 0)
                {
                        memset(res->defdname, 0, sizeof(res->defdname));
                }
                else
                {
                        p = res->dnsrch[*nsrch - 1];
                        for (; (ival > 0) && (*p != '\0'); ival--) p++;
                        if (*p == '\0') p++;
                }

                if (len > ival) return -1;

                memcpy(p, val, len);
                res->dnsrch[*nsrch] = p;
                *nsrch = *nsrch + 1;
                return 0;
        }
        
        else if (!strcmp(key, "nameserver"))
        {               
                dotcount = 0;
                semicount = 0;
                lastdot = NULL;
                aport = port;
                
                for (p = val; *p != '\0'; p++)
                {
                        if (*p == ':') semicount++;
                        else if (*p == '.')
                        {
                                dotcount++;
                                lastdot = p;
                        }
                }
                
                if ((dotcount == 4) || ((semicount > 0) && (lastdot != NULL)))
                {
                        aport = atoi(lastdot + 1);
                        if (aport == 0) aport = port;
                        *lastdot = '\0';
                }

                memset(&addr4, 0, sizeof(struct in_addr));
                memset(&sin4, 0, sizeof(struct sockaddr_in));
                
                memset(&addr6, 0, sizeof(struct in6_addr));
                memset(&sin6, 0, sizeof(struct sockaddr_in6));
                
                status = inet_pton(AF_INET6, val, &addr6);
                if (status == 1)
                {
                        sin6.sin6_addr = addr6;
                        sin6.sin6_family = AF_INET6;
                        sin6.sin6_port = htons(aport);
                        sin6.sin6_len = sizeof(struct sockaddr_in6);
                        if (res->_u._ext.ext != NULL)
                        {
                                memcpy(&(res->_u._ext.ext->nsaddrs[res->nscount]), &sin6, sizeof(struct sockaddr_in6));
                        }
                        res->nsaddr_list[res->nscount].sin_family = 0;
                        res->nscount++;
                }
                else
                {
                        status = inet_pton(AF_INET, val, &addr4);
                        if (status == 1)
                        {
                                sin4.sin_addr = addr4;
                                sin4.sin_family = AF_INET;
                                sin4.sin_port = htons(aport);
                                sin4.sin_len = sizeof(struct sockaddr_in);
                                if (res->_u._ext.ext != NULL)
                                {
                                        memcpy(&(res->_u._ext.ext->nsaddrs[res->nscount]), &sin4, sizeof(struct sockaddr_in));
                                }
                                memcpy(&(res->nsaddr_list[res->nscount]), &sin4, sizeof(struct sockaddr_in));
                                res->nscount++;
                        }
                }
                
                return 0;
        }
        
        else if (!strcmp(key, "sortlist"))
        {
                p = strchr(val, '/');
                
                if (p != NULL)
                {
                        *p = '\0';
                        p++;
                }
                
                /* we use inet_aton rather than inet_pton to be compatible with res_init() */
                status = inet_aton(val, &addr4);
                if (status == 0) return -1;
                        
                status = 0;
                if (p != NULL) status = inet_aton(p, &mask);
                if (status == 0)
                {
                        ival = ntohl(addr4.s_addr);

                        if (IN_CLASSA(ival)) mask.s_addr = htonl(IN_CLASSA_NET);
                        else if (IN_CLASSB(ival)) mask.s_addr = htonl(IN_CLASSB_NET);
                        else mask.s_addr = htonl(IN_CLASSC_NET);
                }

                return res_build_sortlist(res, addr4, mask);
        }
        
        else if (!strcmp(key, "ndots"))
        {
                ival = atoi(val);
                if (ival < 0) ival = 0;
                if (ival > RES_MAXNDOTS) ival = RES_MAXNDOTS;
                res->ndots = ival;
                return 0;
        }
        
        else if (!strcmp(key, "nibble"))
        {
                if ((strlen(val) + 1) > RES_EXT_SUFFIX_LEN) return -1;
                if (res->_u._ext.ext == NULL) return -1;
                strcpy(res->_u._ext.ext->nsuffix, val);
                return 0;
        }
        
        else if (!strcmp(key, "nibble2"))
        {
                if ((strlen(val) + 1) > RES_EXT_SUFFIX_LEN) return -1;
                if (res->_u._ext.ext == NULL) return -1;
                strcpy(res->_u._ext.ext->nsuffix2, val);
                return 0;
        }
        
        else if (!strcmp(key, "bitstring"))
        {
                if ((strlen(val) + 1) > RES_EXT_SUFFIX_LEN) return -1;
                if (res->_u._ext.ext == NULL) return -1;
                strcpy(res->_u._ext.ext->bsuffix, val);
                return 0;
        }
        
        else if (!strcmp(key, "attempts"))
        {
                ival = atoi(val);
                if (ival < 0) ival = 0;
                if (ival > RES_MAXRETRY) ival = RES_MAXRETRY;
                res->retry = ival;
                return 0;
        }
        
        else if (!strcmp(key, "v6revmode"))
        {
                if (!strcmp(val, "single")) res->options |= RES_NO_NIBBLE2;
                else if (!strcmp(val, "both")) res->options &= ~RES_NO_NIBBLE2;
                return 0;
        }
        
        else if (!strcmp(key, "debug"))
        {
                res->options |= RES_DEBUG;
                return 0;
        }
        
        else if (!strcmp(key, "no_tld_query"))
        {
                res->options |= RES_NOTLDQUERY;
                return 0;
        }
        
        else if (!strcmp(key, "inet6"))
        {
                res->options |= RES_USE_INET6;
                return 0;
        }
        
        else if (!strcmp(key, "rotate"))
        {
                res->options |= RES_ROTATE;
                return 0;
        }
        
        else if (!strcmp(key, "no-check-names"))
        {
                res->options |= RES_NOCHECKNAME;
                return 0;
        }
        
#ifdef RES_USE_EDNS0
        else if (!strcmp(key, "edns0"))
        {
                res->options |= RES_USE_EDNS0;
                return 0;
        }
#endif
        
        else if (!strcmp(key, "a6"))
        {
                res->options |= RES_USE_A6;
                return 0;
        }
        
        else if (!strcmp(key, "dname"))
        {
                res->options |= RES_USE_DNAME;
                return 0;
        }

        return -1;
}

/*
 * 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_vinit_from_file(res_state statp, int preinit, char *resconf_file)
{
        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;
        int isresdefault = 0;
        unsigned short port; /* HOST BYTE ORDER */
        unsigned int i, total_timeout;
#ifdef RESOLVSORT
        int nsort = 0;
        char *net;
#endif
        int dots;

        port = NS_DEFAULTPORT;
        total_timeout = 0;

        if (!preinit)
        {
                statp->retrans = RES_TIMEOUT;
                statp->retry = RES_DFLRETRY;
                statp->options = RES_DEFAULT;
                statp->id = res_randomid();
        }

        if ((statp->options & RES_INIT) != 0) res_ndestroy(statp);

        /* N.B. we allocate a new statp->_u._ext.ext below */

        /* make sure version is set */
        statp->_pad = 9;
        
        statp->nscount = 0;
        
        if ((resconf_file == NULL) || (!strcmp(resconf_file, _PATH_RESCONF)))
        {
                isresdefault = 1;
                
#ifdef USELOOPBACK
                statp->nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
#else
                statp->nsaddr.sin_addr.s_addr = INADDR_ANY;
#endif
                statp->nsaddr.sin_family = AF_INET;
                statp->nsaddr.sin_port = htons(NS_DEFAULTPORT);
#ifdef HAVE_SA_LEN
                statp->nsaddr.sin_len = sizeof(struct sockaddr_in);
#endif
                statp->nscount = 1;

                /*
                 * Force loopback queries to use TCP
                 * so we don't take a timeout if named isn't running.
                 */
                statp->options |= RES_USEVC;
        }
        
        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 = (struct __res_state_ext *)calloc(1, sizeof(struct __res_state_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");
                strcpy(statp->_u._ext.ext->bsuffix, "ip6.arpa");
        }
        
#ifdef RESOLVSORT
        statp->nsort = 0;
#endif
        
        /* Allow user to override the local domain definition */
        cp = getenv("LOCALDOMAIN");
        if ((cp != NULL) && (isresdefault != 0))
        {
                (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') break;
                        else if (*cp == ' ' || *cp == '\t')
                        {
                                *cp = 0;
                                n = 1;
                        }
                        else if (n != 0)
                        {
                                *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'))

        if (resconf_file == NULL) resconf_file = _PATH_RESCONF;

        if ((fp = fopen(resconf_file, "r")) != NULL)
        {
                /* look for port number */
                while (fgets(buf, sizeof(buf), fp) != NULL)
                {
                        /* skip comments */
                        if (*buf == ';' || *buf == '#') continue;

                        /* read default domain name */
                        if (MATCH(buf, "port"))
                        {
                                cp = buf + sizeof("port") - 1;
                                while (*cp == ' ' || *cp == '\t') cp++;
                                if ((*cp == '\0') || (*cp == '\n')) continue;
                                port = atoi(cp);
                                break;
                        }
                }
                fclose(fp);
        }

        if ((fp = fopen(resconf_file, "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"))
                        {
                                /* skip if have from environ */
                                if (haveenv) 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';
                                cp = strpbrk(statp->defdname, " \t\n");
                                if (cp != NULL) *cp = '\0';
                                havesearch = 0;
                                continue;
                        }

                        /* set search list */
                        if (MATCH(buf, "search"))
                        {
                                /* skip if have from environ */
                            if (haveenv) 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';
                                cp = strchr(statp->defdname, '\n');
                            if (cp != 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 != 0)
                                        {
                                            *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))
                        {
#ifndef __APPLE__
                            struct addrinfo hints, *ai;
#endif
                                int dotcount, semicount, status;
                                struct in_addr addr4;
                                struct sockaddr_in sin4;
                                struct in6_addr addr6;
                                struct sockaddr_in6 sin6;
                                unsigned short aport; /* HOST BYTE ORDER */
                                char *lastdot, *checkp;
                            char sbuf[NI_MAXSERV];
#ifndef __APPLE__
                            const size_t minsiz = sizeof(statp->_u._ext.ext->nsaddrs[0]);
#endif

                            cp = buf + sizeof("nameserver") - 1;
                            while ((*cp == ' ') || (*cp == '\t')) cp++;
                            cp[strcspn(cp, ";# \t\n")] = '\0';
                            if ((*cp != '\0') && (*cp != '\n'))
                                {
#ifndef __APPLE__
                                        memset(&hints, 0, sizeof(hints));
                                        hints.ai_family = PF_UNSPEC;
                                        hints.ai_socktype = SOCK_DGRAM; /*dummy*/
                                        hints.ai_flags = AI_NUMERICHOST;
#endif
                                        dotcount = 0;
                                        semicount = 0;
                                        lastdot = NULL;
                                        aport = port;

                                        for (checkp = cp; *checkp != '\0'; checkp++)
                                        {
                                                if (*checkp == ':') semicount++;
                                                else if (*checkp == '.')
                                                {
                                                        dotcount++;
                                                        lastdot = checkp;
                                                }
                                        }

                                        if ((dotcount == 4) || ((semicount > 0) && (lastdot != NULL)))
                                        {
                                                aport = atoi(lastdot + 1);
                                                if (aport == 0) aport = port;
                                                *lastdot = '\0';
                                        }
                                        
                                        sprintf(sbuf, "%u", aport);

#ifdef __APPLE__
                                        memset(&addr4, 0, sizeof(struct in_addr));
                                        memset(&sin4, 0, sizeof(struct sockaddr_in));

                                        memset(&addr6, 0, sizeof(struct in6_addr));
                                        memset(&sin6, 0, sizeof(struct sockaddr_in6));

                                        status = inet_pton(AF_INET6, cp, &addr6);
                                        if (status == 1)
                                        {
                                                sin6.sin6_addr = addr6;
                                                sin6.sin6_family = AF_INET6;
                                                sin6.sin6_port = htons(aport);
                                                sin6.sin6_len = sizeof(struct sockaddr_in6);
                                                if (statp->_u._ext.ext != NULL)
                                                {
                                                        memcpy(&statp->_u._ext.ext->nsaddrs[nserv], &sin6, sizeof(struct sockaddr_in6));
                                                }
                                                statp->nsaddr_list[nserv].sin_family = 0;
                                                nserv++;
                                        }
                                        else
                                        {
                                                status = inet_pton(AF_INET, cp, &addr4);
                                                if (status == 1)
                                                {
                                                        sin4.sin_addr = addr4;
                                                        sin4.sin_family = AF_INET;
                                                        sin4.sin_port = htons(port);
                                                        sin4.sin_len = sizeof(struct sockaddr_in);
                                                        if (statp->_u._ext.ext != NULL)
                                                        {
                                                                memcpy(&statp->_u._ext.ext->nsaddrs[nserv], &sin4, sizeof(struct sockaddr_in));
                                                        }
                                                        memcpy(&statp->nsaddr_list[nserv], &sin4, sizeof(struct sockaddr_in));
                                                        nserv++;
                                                }
                   }

                                        
#else
                                        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++;
                                        }
#endif
                                }

                                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 (MATCH(buf, "timeout"))
                        {
                                cp = buf + sizeof("timeout") - 1;
                                while (*cp == ' ' || *cp == '\t') cp++;
                                if ((*cp == '\0') || (*cp == '\n')) continue;
                                i = atoi(cp);
                                if (i > RES_MAXRETRANS) i = RES_MAXRETRANS;
                                total_timeout = i;
                                continue;
                        }
                }

                if (nserv > 1) statp->nscount = nserv;
#ifdef RESOLVSORT
                statp->nsort = nsort;
#endif
                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 (isresdefault != 0)
        {
                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++)
                {
                        if (*cp == '.') dots++;
                }

                /* Back up over any trailing dots and cut them out of the name */
                for (cp--; (cp >= statp->defdname) && (*cp == '.'); cp--)
                {
                        *cp = '\0';
                        dots--;
                }

                cp = statp->defdname;
                while (pp < statp->dnsrch + MAXDFLSRCH)
                {
                        if (dots < LOCALDOMAINPARTS) break;

                        /* we know there is a dot */
                        cp = strchr(cp, '.') + 1;   
                        *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
        }

        cp = getenv("RES_OPTIONS");
        if ((cp != NULL) && (isresdefault != 0))
        {
                res_setoptions(statp, cp, "env");
        }

#ifdef __APPLE__
        /*
         * Post processing to set the timeout value.
         */
        if (total_timeout != 0)
        {
                /* Timeout was set with a "timeout" line in the file */
                statp->retrans = total_timeout;
        }
        else
        {
                /*
                 * Timeout is default, or was set with "options timeout:"
                 * This is a per-select timeout value.  Calculate total timeout
                 * and set statp->restrans which we (Apple) use to indicate
                 * total time allowed for a query to be resolved.
                 */
                total_timeout = statp->retrans * (statp->retry + 1) * statp->nscount;
                statp->retrans = total_timeout;
        }
#endif

        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;
                } 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;
                } 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, "a6", sizeof("a6") - 1)) {
                        statp->options |= RES_USE_A6;
                }
                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, "bitstring:", sizeof("bitstring:") - 1)) {
                        if (ext == NULL)
                                goto skip;
                        cp += sizeof("bitstring:") - 1;
                        i = MIN(strcspn(cp, " \t"), sizeof(ext->bsuffix) - 1);
                        strncpy(ext->bsuffix, cp, i);
                        ext->bsuffix[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++;
        }
}

/* This function has to be reachable by res_data.c but not publically. */
int
__res_vinit(res_state statp, int preinit)
{
        dns_config_t *sc_dns;
        dns_resolver_t *sc_res;
        char val[256], *p, *x;
        int i, n;
        uint32_t nsearch, total_timeout, send_timeout;
        uint16_t port;

        nsearch = 0;
        send_timeout = 0;

        sc_dns = dns_configuration_copy();
        if (sc_dns == NULL) return res_vinit_from_file(statp, preinit, _PATH_RESCONF);

        sc_res = sc_dns->resolver[0];
        port = sc_res->port;
        if (port == 0) port = NS_DEFAULTPORT;

        if ((statp->options & RES_INIT) != 0) res_ndestroy(statp);

        /* N.B. res_build_start will allocate statp->_u._ext.ext for us */
        statp = res_build_start(statp);

        p = getenv("RES_RETRY_TIMEOUT");
        if (p != NULL) send_timeout = atoi(p);

        p = getenv("RES_RETRY");
        if (p != NULL) statp->retry= atoi(p);

        if (sc_res->n_nameserver > MAXNS) sc_res->n_nameserver = MAXNS;
        for (i = 0; i < sc_res->n_nameserver; i++)
        {
                if (sc_res->nameserver[i]->sa_family == AF_INET)
                {
                        memset(val, 0, sizeof(val));
                        inet_ntop(AF_INET, (char *)(sc_res->nameserver[i]) + INET_NTOP_AF_INET_OFFSET, val, sizeof(val));
                        res_build(statp, port, &nsearch, "nameserver", val);
                }
                else if (sc_res->nameserver[i]->sa_family == AF_INET6)
                {
                        memset(val, 0, sizeof(val));
                        inet_ntop(AF_INET6, (char *)(sc_res->nameserver[i]) + INET_NTOP_AF_INET6_OFFSET, val, sizeof(val));
                        res_build(statp, port, &nsearch, "nameserver", val);
                }
        }

        if (sc_res->n_search > MAXDNSRCH) sc_res->n_search = MAXDNSRCH;
        for (i = 0; i < sc_res->n_search; i++)
        {
                res_build(statp, port, &nsearch, "search", sc_res->search[i]);
        }

        /* If there was no search list, use "domain" */
        if ((sc_res->n_search == 0) && (sc_res->domain != NULL))
        {
                /* Count dots */
                n = 0;
                for (p = sc_res->domain; *p != '\0'; p++) 
                {
                        if (*p == '.') n++;
                }

                /* Back up over any trailing dots and cut them out of the name */
                for (p--; (p >= sc_res->domain) && (*p == '.'); p--)
                {
                        *p = '\0';
                        n--;
                }

                if (p >= sc_res->domain) res_build(statp, port, &nsearch, "search", sc_res->domain);

                /* dots are separators, so number of components is one larger */
                n++;

                /* Include parent domains with at least LOCALDOMAINPARTS components */
                p = sc_res->domain;
                while ((n > LOCALDOMAINPARTS) && (nsearch < MAXDFLSRCH))
                {
                        /* Find next component */
                        while (*p != '.') p++;
                        if (*p == '\0') break;
                        p++;

                        n--;
                        res_build(statp, port, &nsearch, "search", p);
                }
        }

        total_timeout = sc_res->timeout;
        
        snprintf(val, sizeof(val), "%d", sc_res->search_order);
        res_build(statp, port, &nsearch, "search_order", val);
        
        if (sc_res->n_sortaddr > MAXRESOLVSORT) sc_res->n_sortaddr = MAXRESOLVSORT;
        for (i = 0; i < sc_res->n_sortaddr; i++)
        {
                res_build_sortlist(statp, sc_res->sortaddr[i]->address, sc_res->sortaddr[i]->mask);
        }
        
        p = sc_res->options;
        while (NULL != (x = res_next_word(&p)))
        {
                if (!strncmp(x, "ndots:", 6))
                {
                        res_build(statp, port, &nsearch, "ndots", x+6);
                }
                
                else if (!strncmp(x, "nibble:", 7))
                {
                        res_build(statp, port, &nsearch, "nibble", x+7);
                }
                
                else if (!strncmp(x, "nibble2:", 8))
                {
                        res_build(statp, port, &nsearch, "nibble2", x+8);
                }
                
                else if (!strncmp(x, "timeout:", 8))
                {
                        send_timeout = atoi(x+8);
                }
                
                else if (!strncmp(x, "attempts:", 9))
                {
                        res_build(statp, port, &nsearch, "attempts", x+9);
                }
                
                else if (!strncmp(x, "bitstring:", 10))
                {
                        res_build(statp, port, &nsearch, "bitstring", x+10);
                }
                
                else if (!strncmp(x, "v6revmode:", 10))
                {
                        res_build(statp, port, &nsearch, "v6revmode", x+10);
                }
                
                else if (!strcmp(x, "debug"))
                {
                        res_build(statp, port, &nsearch, "debug", NULL);
                }
                
                else if (!strcmp(x, "no_tld_query"))
                {
                        res_build(statp, port, &nsearch, "no_tld_query", NULL);
                }
                
                else if (!strcmp(x, "inet6"))
                {
                        res_build(statp, port, &nsearch, "inet6", NULL);
                }
                
                else if (!strcmp(x, "rotate"))
                {
                        res_build(statp, port, &nsearch, "rotate", NULL);
                }
                
                else if (!strcmp(x, "no-check-names"))
                {
                        res_build(statp, port, &nsearch, "no-check-names", NULL);
                }
                
#ifdef RES_USE_EDNS0
                else if (!strcmp(x, "edns0"))
                {
                        res_build(statp, port, &nsearch, "edns0", NULL);
                }               
#endif
                else if (!strcmp(x, "a6"))
                {
                        res_build(statp, port, &nsearch, "a6", NULL);
                }
                
                else if (!strcmp(x, "dname"))
                {
                        res_build(statp, port, &nsearch, "dname", NULL);
                }
        }
        
        n = statp->nscount;
        if (n == 0) n = 1;

        if (total_timeout == 0)
        {
                if (send_timeout == 0) total_timeout = RES_MAXRETRANS;
                else total_timeout = send_timeout * statp->retry * n;
        }

        dns_configuration_free(sc_dns);

        res_build_finish(statp, total_timeout, port);

        return 0;
}

int
res_ninit(res_state statp)
{
        if (statp == NULL) return -1;
        memset(statp, 0, sizeof(struct __res_state));
        return __res_vinit(statp, 0);
}

#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;
#ifdef __APPLE__
        int rf;
        static u_int x = 0;

        if (x == 0)
        {
                rf = open("/dev/random", O_RDONLY, 0);
                if (rf >= 0)
                {
                        read(rf, &x, sizeof(u_int));
                        close(rf);
                }
                else
                {
                        x = (getpid() << 10) + time(NULL);
                }

                srandom(x);
        }

        return random();
#endif

        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)
        { 
                close(statp->_vcsock);
                statp->_vcsock = -1;
                statp->_flags &= ~(RES_F_VC | RES_F_CONN);
        }
        
        if (statp->_pad >= 9)
        {
                for (ns = 0; ns < statp->_u._ext.nscount; ns++)
                {
                        if (statp->_u._ext.nssocks[ns] != -1)
                        {
                                close(statp->_u._ext.nssocks[ns]);
                                statp->_u._ext.nssocks[ns] = -1;
                        }
                }
        }
}

void
res_ndestroy(res_state statp)
{
        res_nclose(statp);
        statp->options &= ~RES_INIT;

        /*
         * _pad (normally unused) is a version number.
         * We use it to prevent BIND_9 from trashing memory
         * if statp was created by BIND-8.
         */
        if (statp->_pad >= 9)
        {
                if (statp->_u._ext.ext != NULL) free(statp->_u._ext.ext);
                statp->_u._ext.ext = NULL;
                statp->_pad = 9;
        }
}

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");
}

const char *
res_get_bitstringsuffix(res_state statp) {
        if (statp->_u._ext.ext)
                return (statp->_u._ext.ext->bsuffix);
        return ("ip6.arpa");
}

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;

                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;

                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;

                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;

                default:
                        set->sin.sin_family = 0;
                        break;
                }
                set++;
        }
        return (statp->nscount);
}