725 lines
18 KiB
C
725 lines
18 KiB
C
#if !defined(lint) && !defined(SABER)
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static const char rcsid[] = "$Id: res_findzonecut.c,v 1.2.2.3.4.4 2005/10/11 00:48:16 marka Exp $";
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#endif /* not lint */
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/*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/* Import. */
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#include "port_before.h"
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <errno.h>
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#include <limits.h>
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#include <netdb.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <isc/list.h>
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#include "port_after.h"
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#include <resolv.h>
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/* Data structures. */
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typedef struct rr_a {
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LINK(struct rr_a) link;
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union res_sockaddr_union addr;
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} rr_a;
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typedef LIST(rr_a) rrset_a;
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typedef struct rr_ns {
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LINK(struct rr_ns) link;
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const char * name;
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unsigned int flags;
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rrset_a addrs;
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} rr_ns;
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typedef LIST(rr_ns) rrset_ns;
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#define RR_NS_HAVE_V4 0x01
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#define RR_NS_HAVE_V6 0x02
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/* Forward. */
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static int satisfy(res_state, const char *, rrset_ns *,
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union res_sockaddr_union *, int);
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static int add_addrs(res_state, rr_ns *,
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union res_sockaddr_union *, int);
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static int get_soa(res_state, const char *, ns_class, int,
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char *, size_t, char *, size_t,
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rrset_ns *);
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static int get_ns(res_state, const char *, ns_class, int, rrset_ns *);
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static int get_glue(res_state, ns_class, int, rrset_ns *);
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static int save_ns(res_state, ns_msg *, ns_sect,
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const char *, ns_class, int, rrset_ns *);
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static int save_a(res_state, ns_msg *, ns_sect,
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const char *, ns_class, int, rr_ns *);
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static void free_nsrrset(rrset_ns *);
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static void free_nsrr(rrset_ns *, rr_ns *);
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static rr_ns * find_ns(rrset_ns *, const char *);
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static int do_query(res_state, const char *, ns_class, ns_type,
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u_char *, ns_msg *);
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static void res_dprintf(const char *, ...) ISC_FORMAT_PRINTF(1, 2);
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/* Macros. */
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#define DPRINTF(x) do {\
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int save_errno = errno; \
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if ((statp->options & RES_DEBUG) != 0U) res_dprintf x; \
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errno = save_errno; \
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} while (0)
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/* Public. */
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/*
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* int
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* res_findzonecut(res, dname, class, zname, zsize, addrs, naddrs)
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* find enclosing zone for a <dname,class>, and some server addresses
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* parameters:
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* res - resolver context to work within (is modified)
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* dname - domain name whose enclosing zone is desired
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* class - class of dname (and its enclosing zone)
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* zname - found zone name
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* zsize - allocated size of zname
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* addrs - found server addresses
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* naddrs - max number of addrs
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* return values:
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* < 0 - an error occurred (check errno)
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* = 0 - zname is now valid, but addrs[] wasn't changed
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* > 0 - zname is now valid, and return value is number of addrs[] found
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* notes:
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* this function calls res_nsend() which means it depends on correctly
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* functioning recursive nameservers (usually defined in /etc/resolv.conf
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* or its local equivilent).
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*
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* we start by asking for an SOA<dname,class>. if we get one as an
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* answer, that just means <dname,class> is a zone top, which is fine.
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* more than likely we'll be told to go pound sand, in the form of a
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* negative answer.
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*
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* note that we are not prepared to deal with referrals since that would
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* only come from authority servers and our correctly functioning local
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* recursive server would have followed the referral and got us something
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* more definite.
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*
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* if the authority section contains an SOA, this SOA should also be the
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* closest enclosing zone, since any intermediary zone cuts would've been
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* returned as referrals and dealt with by our correctly functioning local
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* recursive name server. but an SOA in the authority section should NOT
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* match our dname (since that would have been returned in the answer
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* section). an authority section SOA has to be "above" our dname.
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*
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* however, since authority section SOA's were once optional, it's
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* possible that we'll have to go hunting for the enclosing SOA by
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* ripping labels off the front of our dname -- this is known as "doing
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* it the hard way."
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*
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* ultimately we want some server addresses, which are ideally the ones
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* pertaining to the SOA.MNAME, but only if there is a matching NS RR.
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* so the second phase (after we find an SOA) is to go looking for the
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* NS RRset for that SOA's zone.
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*
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* no answer section processed by this code is allowed to contain CNAME
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* or DNAME RR's. for the SOA query this means we strip a label and
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* keep going. for the NS and A queries this means we just give up.
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*/
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#ifndef _LIBC
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int
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res_findzonecut(res_state statp, const char *dname, ns_class class, int opts,
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char *zname, size_t zsize, struct in_addr *addrs, int naddrs)
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{
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int result, i;
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union res_sockaddr_union *u;
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opts |= RES_IPV4ONLY;
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opts &= ~RES_IPV6ONLY;
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u = calloc(naddrs, sizeof(*u));
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if (u == NULL)
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return(-1);
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result = res_findzonecut2(statp, dname, class, opts, zname, zsize,
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u, naddrs);
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for (i = 0; i < result; i++) {
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addrs[i] = u[i].sin.sin_addr;
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}
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free(u);
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return (result);
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}
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#endif
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int
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res_findzonecut2(res_state statp, const char *dname, ns_class class, int opts,
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char *zname, size_t zsize, union res_sockaddr_union *addrs,
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int naddrs)
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{
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char mname[NS_MAXDNAME];
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u_long save_pfcode;
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rrset_ns nsrrs;
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int n;
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DPRINTF(("START dname='%s' class=%s, zsize=%ld, naddrs=%d",
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dname, p_class(class), (long)zsize, naddrs));
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save_pfcode = statp->pfcode;
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statp->pfcode |= RES_PRF_HEAD2 | RES_PRF_HEAD1 | RES_PRF_HEADX |
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RES_PRF_QUES | RES_PRF_ANS |
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RES_PRF_AUTH | RES_PRF_ADD;
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INIT_LIST(nsrrs);
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DPRINTF(("get the soa, and see if it has enough glue"));
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if ((n = get_soa(statp, dname, class, opts, zname, zsize,
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mname, sizeof mname, &nsrrs)) < 0 ||
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((opts & RES_EXHAUSTIVE) == 0 &&
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(n = satisfy(statp, mname, &nsrrs, addrs, naddrs)) > 0))
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goto done;
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DPRINTF(("get the ns rrset and see if it has enough glue"));
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if ((n = get_ns(statp, zname, class, opts, &nsrrs)) < 0 ||
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((opts & RES_EXHAUSTIVE) == 0 &&
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(n = satisfy(statp, mname, &nsrrs, addrs, naddrs)) > 0))
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goto done;
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DPRINTF(("get the missing glue and see if it's finally enough"));
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if ((n = get_glue(statp, class, opts, &nsrrs)) >= 0)
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n = satisfy(statp, mname, &nsrrs, addrs, naddrs);
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done:
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DPRINTF(("FINISH n=%d (%s)", n, (n < 0) ? strerror(errno) : "OK"));
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free_nsrrset(&nsrrs);
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statp->pfcode = save_pfcode;
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return (n);
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}
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/* Private. */
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static int
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satisfy(res_state statp, const char *mname, rrset_ns *nsrrsp,
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union res_sockaddr_union *addrs, int naddrs)
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{
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rr_ns *nsrr;
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int n, x;
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n = 0;
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nsrr = find_ns(nsrrsp, mname);
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if (nsrr != NULL) {
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x = add_addrs(statp, nsrr, addrs, naddrs);
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addrs += x;
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naddrs -= x;
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n += x;
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}
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for (nsrr = HEAD(*nsrrsp);
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nsrr != NULL && naddrs > 0;
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nsrr = NEXT(nsrr, link))
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if (ns_samename(nsrr->name, mname) != 1) {
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x = add_addrs(statp, nsrr, addrs, naddrs);
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addrs += x;
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naddrs -= x;
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n += x;
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}
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DPRINTF(("satisfy(%s): %d", mname, n));
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return (n);
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}
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static int
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add_addrs(res_state statp, rr_ns *nsrr,
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union res_sockaddr_union *addrs, int naddrs)
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{
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rr_a *arr;
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int n = 0;
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for (arr = HEAD(nsrr->addrs); arr != NULL; arr = NEXT(arr, link)) {
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if (naddrs <= 0)
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return (0);
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*addrs++ = arr->addr;
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naddrs--;
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n++;
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}
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DPRINTF(("add_addrs: %d", n));
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return (n);
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}
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static int
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get_soa(res_state statp, const char *dname, ns_class class, int opts,
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char *zname, size_t zsize, char *mname, size_t msize,
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rrset_ns *nsrrsp)
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{
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char tname[NS_MAXDNAME];
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u_char *resp = NULL;
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int n, i, ancount, nscount;
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ns_sect sect;
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ns_msg msg;
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u_int rcode;
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/*
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* Find closest enclosing SOA, even if it's for the root zone.
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*/
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/* First canonicalize dname (exactly one unescaped trailing "."). */
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if (ns_makecanon(dname, tname, sizeof tname) < 0)
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goto cleanup;
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dname = tname;
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resp = malloc(NS_MAXMSG);
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if (resp == NULL)
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goto cleanup;
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/* Now grovel the subdomains, hunting for an SOA answer or auth. */
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for (;;) {
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/* Leading or inter-label '.' are skipped here. */
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while (*dname == '.')
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dname++;
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/* Is there an SOA? */
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n = do_query(statp, dname, class, ns_t_soa, resp, &msg);
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if (n < 0) {
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DPRINTF(("get_soa: do_query('%s', %s) failed (%d)",
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dname, p_class(class), n));
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goto cleanup;
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}
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if (n > 0) {
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DPRINTF(("get_soa: CNAME or DNAME found"));
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sect = ns_s_max, n = 0;
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} else {
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rcode = ns_msg_getflag(msg, ns_f_rcode);
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ancount = ns_msg_count(msg, ns_s_an);
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nscount = ns_msg_count(msg, ns_s_ns);
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if (ancount > 0 && rcode == ns_r_noerror)
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sect = ns_s_an, n = ancount;
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else if (nscount > 0)
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sect = ns_s_ns, n = nscount;
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else
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sect = ns_s_max, n = 0;
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}
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for (i = 0; i < n; i++) {
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const char *t;
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const u_char *rdata;
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ns_rr rr;
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if (ns_parserr(&msg, sect, i, &rr) < 0) {
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DPRINTF(("get_soa: ns_parserr(%s, %d) failed",
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p_section(sect, ns_o_query), i));
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goto cleanup;
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}
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if (ns_rr_type(rr) == ns_t_cname ||
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ns_rr_type(rr) == ns_t_dname)
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break;
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if (ns_rr_type(rr) != ns_t_soa ||
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ns_rr_class(rr) != class)
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continue;
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t = ns_rr_name(rr);
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switch (sect) {
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case ns_s_an:
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if (ns_samedomain(dname, t) == 0) {
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DPRINTF(
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("get_soa: ns_samedomain('%s', '%s') == 0",
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dname, t)
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);
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errno = EPROTOTYPE;
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goto cleanup;
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}
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break;
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case ns_s_ns:
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if (ns_samename(dname, t) == 1 ||
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ns_samedomain(dname, t) == 0) {
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DPRINTF(
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("get_soa: ns_samename() || !ns_samedomain('%s', '%s')",
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dname, t)
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);
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errno = EPROTOTYPE;
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goto cleanup;
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}
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break;
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default:
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abort();
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}
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if (strlen(t) + 1 > zsize) {
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DPRINTF(("get_soa: zname(%lu) too small (%lu)",
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(unsigned long)zsize,
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(unsigned long)strlen(t) + 1));
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errno = EMSGSIZE;
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goto cleanup;
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}
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strcpy(zname, t);
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rdata = ns_rr_rdata(rr);
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if (ns_name_uncompress(resp, ns_msg_end(msg), rdata,
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mname, msize) < 0) {
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DPRINTF(("get_soa: ns_name_uncompress failed")
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);
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goto cleanup;
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}
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if (save_ns(statp, &msg, ns_s_ns,
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zname, class, opts, nsrrsp) < 0) {
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DPRINTF(("get_soa: save_ns failed"));
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goto cleanup;
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}
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free(resp);
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return (0);
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}
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/* If we're out of labels, then not even "." has an SOA! */
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if (*dname == '\0')
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break;
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/* Find label-terminating "."; top of loop will skip it. */
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while (*dname != '.') {
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if (*dname == '\\')
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if (*++dname == '\0') {
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errno = EMSGSIZE;
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goto cleanup;
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}
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dname++;
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}
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}
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DPRINTF(("get_soa: out of labels"));
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errno = EDESTADDRREQ;
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cleanup:
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if (resp != NULL)
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free(resp);
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return (-1);
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}
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static int
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get_ns(res_state statp, const char *zname, ns_class class, int opts,
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rrset_ns *nsrrsp)
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{
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u_char *resp;
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ns_msg msg;
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int n;
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resp = malloc(NS_MAXMSG);
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if (resp == NULL)
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return (-1);
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/* Go and get the NS RRs for this zone. */
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n = do_query(statp, zname, class, ns_t_ns, resp, &msg);
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if (n != 0) {
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DPRINTF(("get_ns: do_query('%s', %s) failed (%d)",
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zname, p_class(class), n));
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free(resp);
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return (-1);
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}
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/* Remember the NS RRs and associated A RRs that came back. */
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if (save_ns(statp, &msg, ns_s_an, zname, class, opts, nsrrsp) < 0) {
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DPRINTF(("get_ns save_ns('%s', %s) failed",
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zname, p_class(class)));
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free(resp);
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return (-1);
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}
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free(resp);
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return (0);
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}
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static int
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get_glue(res_state statp, ns_class class, int opts, rrset_ns *nsrrsp) {
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rr_ns *nsrr, *nsrr_n;
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u_char *resp;
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resp = malloc(NS_MAXMSG);
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if (resp == NULL)
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return(-1);
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/* Go and get the A RRs for each empty NS RR on our list. */
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for (nsrr = HEAD(*nsrrsp); nsrr != NULL; nsrr = nsrr_n) {
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ns_msg msg;
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int n;
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nsrr_n = NEXT(nsrr, link);
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if ((nsrr->flags & RR_NS_HAVE_V4) == 0) {
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n = do_query(statp, nsrr->name, class, ns_t_a,
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resp, &msg);
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if (n < 0) {
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DPRINTF(
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("get_glue: do_query('%s', %s') failed",
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nsrr->name, p_class(class)));
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goto cleanup;
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}
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if (n > 0) {
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DPRINTF((
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"get_glue: do_query('%s', %s') CNAME or DNAME found",
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nsrr->name, p_class(class)));
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}
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if (save_a(statp, &msg, ns_s_an, nsrr->name, class,
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opts, nsrr) < 0) {
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DPRINTF(("get_glue: save_r('%s', %s) failed",
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nsrr->name, p_class(class)));
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goto cleanup;
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}
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}
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if ((nsrr->flags & RR_NS_HAVE_V6) == 0) {
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n = do_query(statp, nsrr->name, class, ns_t_aaaa,
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resp, &msg);
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if (n < 0) {
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DPRINTF(
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("get_glue: do_query('%s', %s') failed",
|
|
nsrr->name, p_class(class)));
|
|
goto cleanup;
|
|
}
|
|
if (n > 0) {
|
|
DPRINTF((
|
|
"get_glue: do_query('%s', %s') CNAME or DNAME found",
|
|
nsrr->name, p_class(class)));
|
|
}
|
|
if (save_a(statp, &msg, ns_s_an, nsrr->name, class,
|
|
opts, nsrr) < 0) {
|
|
DPRINTF(("get_glue: save_r('%s', %s) failed",
|
|
nsrr->name, p_class(class)));
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
/* If it's still empty, it's just chaff. */
|
|
if (EMPTY(nsrr->addrs)) {
|
|
DPRINTF(("get_glue: removing empty '%s' NS",
|
|
nsrr->name));
|
|
free_nsrr(nsrrsp, nsrr);
|
|
}
|
|
}
|
|
free(resp);
|
|
return (0);
|
|
|
|
cleanup:
|
|
free(resp);
|
|
return (-1);
|
|
}
|
|
|
|
static int
|
|
save_ns(res_state statp, ns_msg *msg, ns_sect sect,
|
|
const char *owner, ns_class class, int opts,
|
|
rrset_ns *nsrrsp)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ns_msg_count(*msg, sect); i++) {
|
|
char tname[MAXDNAME];
|
|
const u_char *rdata;
|
|
rr_ns *nsrr;
|
|
ns_rr rr;
|
|
|
|
if (ns_parserr(msg, sect, i, &rr) < 0) {
|
|
DPRINTF(("save_ns: ns_parserr(%s, %d) failed",
|
|
p_section(sect, ns_o_query), i));
|
|
return (-1);
|
|
}
|
|
if (ns_rr_type(rr) != ns_t_ns ||
|
|
ns_rr_class(rr) != class ||
|
|
ns_samename(ns_rr_name(rr), owner) != 1)
|
|
continue;
|
|
nsrr = find_ns(nsrrsp, ns_rr_name(rr));
|
|
if (nsrr == NULL) {
|
|
nsrr = malloc(sizeof *nsrr);
|
|
if (nsrr == NULL) {
|
|
DPRINTF(("save_ns: malloc failed"));
|
|
return (-1);
|
|
}
|
|
rdata = ns_rr_rdata(rr);
|
|
if (ns_name_uncompress(ns_msg_base(*msg),
|
|
ns_msg_end(*msg), rdata,
|
|
tname, sizeof tname) < 0) {
|
|
DPRINTF(("save_ns: ns_name_uncompress failed")
|
|
);
|
|
free(nsrr);
|
|
return (-1);
|
|
}
|
|
nsrr->name = strdup(tname);
|
|
if (nsrr->name == NULL) {
|
|
DPRINTF(("save_ns: strdup failed"));
|
|
free(nsrr);
|
|
return (-1);
|
|
}
|
|
INIT_LINK(nsrr, link);
|
|
INIT_LIST(nsrr->addrs);
|
|
nsrr->flags = 0;
|
|
APPEND(*nsrrsp, nsrr, link);
|
|
}
|
|
if (save_a(statp, msg, ns_s_ar,
|
|
nsrr->name, class, opts, nsrr) < 0) {
|
|
DPRINTF(("save_ns: save_r('%s', %s) failed",
|
|
nsrr->name, p_class(class)));
|
|
return (-1);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
save_a(res_state statp, ns_msg *msg, ns_sect sect,
|
|
const char *owner, ns_class class, int opts,
|
|
rr_ns *nsrr)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ns_msg_count(*msg, sect); i++) {
|
|
ns_rr rr;
|
|
rr_a *arr;
|
|
|
|
if (ns_parserr(msg, sect, i, &rr) < 0) {
|
|
DPRINTF(("save_a: ns_parserr(%s, %d) failed",
|
|
p_section(sect, ns_o_query), i));
|
|
return (-1);
|
|
}
|
|
if ((ns_rr_type(rr) != ns_t_a &&
|
|
ns_rr_type(rr) != ns_t_aaaa) ||
|
|
ns_rr_class(rr) != class ||
|
|
ns_samename(ns_rr_name(rr), owner) != 1 ||
|
|
ns_rr_rdlen(rr) != NS_INADDRSZ)
|
|
continue;
|
|
if ((opts & RES_IPV6ONLY) != 0 && ns_rr_type(rr) != ns_t_aaaa)
|
|
continue;
|
|
if ((opts & RES_IPV4ONLY) != 0 && ns_rr_type(rr) != ns_t_a)
|
|
continue;
|
|
arr = malloc(sizeof *arr);
|
|
if (arr == NULL) {
|
|
DPRINTF(("save_a: malloc failed"));
|
|
return (-1);
|
|
}
|
|
INIT_LINK(arr, link);
|
|
memset(&arr->addr, 0, sizeof(arr->addr));
|
|
switch (ns_rr_type(rr)) {
|
|
case ns_t_a:
|
|
arr->addr.sin.sin_family = AF_INET;
|
|
#ifdef HAVE_SA_LEN
|
|
arr->addr.sin.sin_len = sizeof(arr->addr.sin);
|
|
#endif
|
|
memcpy(&arr->addr.sin.sin_addr, ns_rr_rdata(rr),
|
|
NS_INADDRSZ);
|
|
arr->addr.sin.sin_port = htons(NAMESERVER_PORT);
|
|
nsrr->flags |= RR_NS_HAVE_V4;
|
|
break;
|
|
case ns_t_aaaa:
|
|
arr->addr.sin6.sin6_family = AF_INET6;
|
|
#ifdef HAVE_SA_LEN
|
|
arr->addr.sin6.sin6_len = sizeof(arr->addr.sin6);
|
|
#endif
|
|
memcpy(&arr->addr.sin6.sin6_addr, ns_rr_rdata(rr), 16);
|
|
arr->addr.sin.sin_port = htons(NAMESERVER_PORT);
|
|
nsrr->flags |= RR_NS_HAVE_V6;
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
APPEND(nsrr->addrs, arr, link);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
free_nsrrset(rrset_ns *nsrrsp) {
|
|
rr_ns *nsrr;
|
|
|
|
while ((nsrr = HEAD(*nsrrsp)) != NULL)
|
|
free_nsrr(nsrrsp, nsrr);
|
|
}
|
|
|
|
static void
|
|
free_nsrr(rrset_ns *nsrrsp, rr_ns *nsrr) {
|
|
rr_a *arr;
|
|
char *tmp;
|
|
|
|
while ((arr = HEAD(nsrr->addrs)) != NULL) {
|
|
UNLINK(nsrr->addrs, arr, link);
|
|
free(arr);
|
|
}
|
|
DE_CONST(nsrr->name, tmp);
|
|
free(tmp);
|
|
UNLINK(*nsrrsp, nsrr, link);
|
|
free(nsrr);
|
|
}
|
|
|
|
static rr_ns *
|
|
find_ns(rrset_ns *nsrrsp, const char *dname) {
|
|
rr_ns *nsrr;
|
|
|
|
for (nsrr = HEAD(*nsrrsp); nsrr != NULL; nsrr = NEXT(nsrr, link))
|
|
if (ns_samename(nsrr->name, dname) == 1)
|
|
return (nsrr);
|
|
return (NULL);
|
|
}
|
|
|
|
static int
|
|
do_query(res_state statp, const char *dname, ns_class class, ns_type qtype,
|
|
u_char *resp, ns_msg *msg)
|
|
{
|
|
u_char req[NS_PACKETSZ];
|
|
int i, n;
|
|
|
|
n = res_nmkquery(statp, ns_o_query, dname, class, qtype,
|
|
NULL, 0, NULL, req, NS_PACKETSZ);
|
|
if (n < 0) {
|
|
DPRINTF(("do_query: res_nmkquery failed"));
|
|
return (-1);
|
|
}
|
|
n = res_nsend(statp, req, n, resp, NS_MAXMSG);
|
|
if (n < 0) {
|
|
DPRINTF(("do_query: res_nsend failed"));
|
|
return (-1);
|
|
}
|
|
if (n == 0) {
|
|
DPRINTF(("do_query: res_nsend returned 0"));
|
|
errno = EMSGSIZE;
|
|
return (-1);
|
|
}
|
|
if (ns_initparse(resp, n, msg) < 0) {
|
|
DPRINTF(("do_query: ns_initparse failed"));
|
|
return (-1);
|
|
}
|
|
n = 0;
|
|
for (i = 0; i < ns_msg_count(*msg, ns_s_an); i++) {
|
|
ns_rr rr;
|
|
|
|
if (ns_parserr(msg, ns_s_an, i, &rr) < 0) {
|
|
DPRINTF(("do_query: ns_parserr failed"));
|
|
return (-1);
|
|
}
|
|
n += (ns_rr_class(rr) == class &&
|
|
(ns_rr_type(rr) == ns_t_cname ||
|
|
ns_rr_type(rr) == ns_t_dname));
|
|
}
|
|
return (n);
|
|
}
|
|
|
|
static void
|
|
res_dprintf(const char *fmt, ...) {
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
fputs(";; res_findzonecut: ", stderr);
|
|
vfprintf(stderr, fmt, ap);
|
|
fputc('\n', stderr);
|
|
va_end(ap);
|
|
}
|