[rtems-libbsd commit] Added res_findzonecut2 to user space.
Jennifer Averett
jennifer at rtems.org
Wed Sep 12 19:16:13 UTC 2012
Module: rtems-libbsd
Branch: master
Commit: 5a95703a80a34261e74a8da292fbabc17a0f347a
Changeset: http://git.rtems.org/rtems-libbsd/commit/?id=5a95703a80a34261e74a8da292fbabc17a0f347a
Author: Jennifer Averett <jennifer.averett at oarcorp.com>
Date: Wed Sep 12 14:20:15 2012 -0500
Added res_findzonecut2 to user space.
---
freebsd-userspace/Makefile | 1 +
.../lib/libc/resolv/res_findzonecut.c | 727 ++++++++++++++++++++
2 files changed, 728 insertions(+), 0 deletions(-)
diff --git a/freebsd-userspace/Makefile b/freebsd-userspace/Makefile
index 7055f0a..7653874 100644
--- a/freebsd-userspace/Makefile
+++ b/freebsd-userspace/Makefile
@@ -77,6 +77,7 @@ C_FILES += lib/libc/resolv/herror.c
C_FILES += lib/libc/resolv/res_comp.c
C_FILES += lib/libc/resolv/res_data.c
C_FILES += lib/libc/resolv/res_debug.c
+C_FILES += lib/libc/resolv/res_findzonecut.c
C_FILES += lib/libc/resolv/res_init.c
C_FILES += lib/libc/resolv/res_mkquery.c
C_FILES += lib/libc/resolv/res_mkupdate.c
diff --git a/freebsd-userspace/lib/libc/resolv/res_findzonecut.c b/freebsd-userspace/lib/libc/resolv/res_findzonecut.c
new file mode 100644
index 0000000..23c1af4
--- /dev/null
+++ b/freebsd-userspace/lib/libc/resolv/res_findzonecut.c
@@ -0,0 +1,727 @@
+#if !defined(lint) && !defined(SABER)
+static const char rcsid[] = "$Id: res_findzonecut.c,v 1.7.18.3 2005/10/11 00:25:11 marka Exp $";
+#endif /* not lint */
+
+/*
+ * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 1999 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+ * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/* Import. */
+
+#include "port_before.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 <errno.h>
+#include <limits.h>
+#include <netdb.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <isc/list.h>
+
+#include "port_after.h"
+
+#include <resolv.h>
+
+/* Data structures. */
+
+typedef struct rr_a {
+ LINK(struct rr_a) link;
+ union res_sockaddr_union addr;
+} rr_a;
+typedef LIST(rr_a) rrset_a;
+
+typedef struct rr_ns {
+ LINK(struct rr_ns) link;
+ const char * name;
+ unsigned int flags;
+ rrset_a addrs;
+} rr_ns;
+typedef LIST(rr_ns) rrset_ns;
+
+#define RR_NS_HAVE_V4 0x01
+#define RR_NS_HAVE_V6 0x02
+
+/* Forward. */
+
+static int satisfy(res_state, const char *, rrset_ns *,
+ union res_sockaddr_union *, int);
+static int add_addrs(res_state, rr_ns *,
+ union res_sockaddr_union *, int);
+static int get_soa(res_state, const char *, ns_class, int,
+ char *, size_t, char *, size_t,
+ rrset_ns *);
+static int get_ns(res_state, const char *, ns_class, int, rrset_ns *);
+static int get_glue(res_state, ns_class, int, rrset_ns *);
+static int save_ns(res_state, ns_msg *, ns_sect,
+ const char *, ns_class, int, rrset_ns *);
+static int save_a(res_state, ns_msg *, ns_sect,
+ const char *, ns_class, int, rr_ns *);
+static void free_nsrrset(rrset_ns *);
+static void free_nsrr(rrset_ns *, rr_ns *);
+static rr_ns * find_ns(rrset_ns *, const char *);
+static int do_query(res_state, const char *, ns_class, ns_type,
+ u_char *, ns_msg *);
+static void res_dprintf(const char *, ...) ISC_FORMAT_PRINTF(1, 2);
+
+/* Macros. */
+
+#define DPRINTF(x) do {\
+ int save_errno = errno; \
+ if ((statp->options & RES_DEBUG) != 0U) res_dprintf x; \
+ errno = save_errno; \
+ } while (0)
+
+/* Public. */
+
+/*%
+ * find enclosing zone for a <dname,class>, and some server addresses
+ *
+ * parameters:
+ *\li res - resolver context to work within (is modified)
+ *\li dname - domain name whose enclosing zone is desired
+ *\li class - class of dname (and its enclosing zone)
+ *\li zname - found zone name
+ *\li zsize - allocated size of zname
+ *\li addrs - found server addresses
+ *\li naddrs - max number of addrs
+ *
+ * return values:
+ *\li < 0 - an error occurred (check errno)
+ *\li = 0 - zname is now valid, but addrs[] wasn't changed
+ *\li > 0 - zname is now valid, and return value is number of addrs[] found
+ *
+ * notes:
+ *\li this function calls res_nsend() which means it depends on correctly
+ * functioning recursive nameservers (usually defined in /etc/resolv.conf
+ * or its local equivilent).
+ *
+ *\li we start by asking for an SOA<dname,class>. if we get one as an
+ * answer, that just means <dname,class> is a zone top, which is fine.
+ * more than likely we'll be told to go pound sand, in the form of a
+ * negative answer.
+ *
+ *\li note that we are not prepared to deal with referrals since that would
+ * only come from authority servers and our correctly functioning local
+ * recursive server would have followed the referral and got us something
+ * more definite.
+ *
+ *\li if the authority section contains an SOA, this SOA should also be the
+ * closest enclosing zone, since any intermediary zone cuts would've been
+ * returned as referrals and dealt with by our correctly functioning local
+ * recursive name server. but an SOA in the authority section should NOT
+ * match our dname (since that would have been returned in the answer
+ * section). an authority section SOA has to be "above" our dname.
+ *
+ *\li however, since authority section SOA's were once optional, it's
+ * possible that we'll have to go hunting for the enclosing SOA by
+ * ripping labels off the front of our dname -- this is known as "doing
+ * it the hard way."
+ *
+ *\li ultimately we want some server addresses, which are ideally the ones
+ * pertaining to the SOA.MNAME, but only if there is a matching NS RR.
+ * so the second phase (after we find an SOA) is to go looking for the
+ * NS RRset for that SOA's zone.
+ *
+ *\li no answer section processed by this code is allowed to contain CNAME
+ * or DNAME RR's. for the SOA query this means we strip a label and
+ * keep going. for the NS and A queries this means we just give up.
+ */
+
+#ifndef _LIBC
+int
+res_findzonecut(res_state statp, const char *dname, ns_class class, int opts,
+ char *zname, size_t zsize, struct in_addr *addrs, int naddrs)
+{
+ int result, i;
+ union res_sockaddr_union *u;
+
+
+ opts |= RES_IPV4ONLY;
+ opts &= ~RES_IPV6ONLY;
+
+ u = calloc(naddrs, sizeof(*u));
+ if (u == NULL)
+ return(-1);
+
+ result = res_findzonecut2(statp, dname, class, opts, zname, zsize,
+ u, naddrs);
+
+ for (i = 0; i < result; i++) {
+ addrs[i] = u[i].sin.sin_addr;
+ }
+ free(u);
+ return (result);
+}
+#endif
+
+int
+res_findzonecut2(res_state statp, const char *dname, ns_class class, int opts,
+ char *zname, size_t zsize, union res_sockaddr_union *addrs,
+ int naddrs)
+{
+ char mname[NS_MAXDNAME];
+ u_long save_pfcode;
+ rrset_ns nsrrs;
+ int n;
+
+ DPRINTF(("START dname='%s' class=%s, zsize=%ld, naddrs=%d",
+ dname, p_class(class), (long)zsize, naddrs));
+ save_pfcode = statp->pfcode;
+ statp->pfcode |= RES_PRF_HEAD2 | RES_PRF_HEAD1 | RES_PRF_HEADX |
+ RES_PRF_QUES | RES_PRF_ANS |
+ RES_PRF_AUTH | RES_PRF_ADD;
+ INIT_LIST(nsrrs);
+
+ DPRINTF(("get the soa, and see if it has enough glue"));
+ if ((n = get_soa(statp, dname, class, opts, zname, zsize,
+ mname, sizeof mname, &nsrrs)) < 0 ||
+ ((opts & RES_EXHAUSTIVE) == 0 &&
+ (n = satisfy(statp, mname, &nsrrs, addrs, naddrs)) > 0))
+ goto done;
+
+ DPRINTF(("get the ns rrset and see if it has enough glue"));
+ if ((n = get_ns(statp, zname, class, opts, &nsrrs)) < 0 ||
+ ((opts & RES_EXHAUSTIVE) == 0 &&
+ (n = satisfy(statp, mname, &nsrrs, addrs, naddrs)) > 0))
+ goto done;
+
+ DPRINTF(("get the missing glue and see if it's finally enough"));
+ if ((n = get_glue(statp, class, opts, &nsrrs)) >= 0)
+ n = satisfy(statp, mname, &nsrrs, addrs, naddrs);
+
+ done:
+ DPRINTF(("FINISH n=%d (%s)", n, (n < 0) ? strerror(errno) : "OK"));
+ free_nsrrset(&nsrrs);
+ statp->pfcode = save_pfcode;
+ return (n);
+}
+
+/* Private. */
+
+static int
+satisfy(res_state statp, const char *mname, rrset_ns *nsrrsp,
+ union res_sockaddr_union *addrs, int naddrs)
+{
+ rr_ns *nsrr;
+ int n, x;
+
+ n = 0;
+ nsrr = find_ns(nsrrsp, mname);
+ if (nsrr != NULL) {
+ x = add_addrs(statp, nsrr, addrs, naddrs);
+ addrs += x;
+ naddrs -= x;
+ n += x;
+ }
+ for (nsrr = HEAD(*nsrrsp);
+ nsrr != NULL && naddrs > 0;
+ nsrr = NEXT(nsrr, link))
+ if (ns_samename(nsrr->name, mname) != 1) {
+ x = add_addrs(statp, nsrr, addrs, naddrs);
+ addrs += x;
+ naddrs -= x;
+ n += x;
+ }
+ DPRINTF(("satisfy(%s): %d", mname, n));
+ return (n);
+}
+
+static int
+add_addrs(res_state statp, rr_ns *nsrr,
+ union res_sockaddr_union *addrs, int naddrs)
+{
+ rr_a *arr;
+ int n = 0;
+
+ for (arr = HEAD(nsrr->addrs); arr != NULL; arr = NEXT(arr, link)) {
+ if (naddrs <= 0)
+ return (0);
+ *addrs++ = arr->addr;
+ naddrs--;
+ n++;
+ }
+ DPRINTF(("add_addrs: %d", n));
+ return (n);
+}
+
+static int
+get_soa(res_state statp, const char *dname, ns_class class, int opts,
+ char *zname, size_t zsize, char *mname, size_t msize,
+ rrset_ns *nsrrsp)
+{
+ char tname[NS_MAXDNAME];
+ u_char *resp = NULL;
+ int n, i, ancount, nscount;
+ ns_sect sect;
+ ns_msg msg;
+ u_int rcode;
+
+ /*
+ * Find closest enclosing SOA, even if it's for the root zone.
+ */
+
+ /* First canonicalize dname (exactly one unescaped trailing "."). */
+ if (ns_makecanon(dname, tname, sizeof tname) < 0)
+ goto cleanup;
+ dname = tname;
+
+ resp = malloc(NS_MAXMSG);
+ if (resp == NULL)
+ goto cleanup;
+
+ /* Now grovel the subdomains, hunting for an SOA answer or auth. */
+ for (;;) {
+ /* Leading or inter-label '.' are skipped here. */
+ while (*dname == '.')
+ dname++;
+
+ /* Is there an SOA? */
+ n = do_query(statp, dname, class, ns_t_soa, resp, &msg);
+ if (n < 0) {
+ DPRINTF(("get_soa: do_query('%s', %s) failed (%d)",
+ dname, p_class(class), n));
+ goto cleanup;
+ }
+ if (n > 0) {
+ DPRINTF(("get_soa: CNAME or DNAME found"));
+ sect = ns_s_max, n = 0;
+ } else {
+ rcode = ns_msg_getflag(msg, ns_f_rcode);
+ ancount = ns_msg_count(msg, ns_s_an);
+ nscount = ns_msg_count(msg, ns_s_ns);
+ if (ancount > 0 && rcode == ns_r_noerror)
+ sect = ns_s_an, n = ancount;
+ else if (nscount > 0)
+ sect = ns_s_ns, n = nscount;
+ else
+ sect = ns_s_max, n = 0;
+ }
+ for (i = 0; i < n; i++) {
+ const char *t;
+ const u_char *rdata;
+ ns_rr rr;
+
+ if (ns_parserr(&msg, sect, i, &rr) < 0) {
+ DPRINTF(("get_soa: ns_parserr(%s, %d) failed",
+ p_section(sect, ns_o_query), i));
+ goto cleanup;
+ }
+ if (ns_rr_type(rr) == ns_t_cname ||
+ ns_rr_type(rr) == ns_t_dname)
+ break;
+ if (ns_rr_type(rr) != ns_t_soa ||
+ ns_rr_class(rr) != class)
+ continue;
+ t = ns_rr_name(rr);
+ switch (sect) {
+ case ns_s_an:
+ if (ns_samedomain(dname, t) == 0) {
+ DPRINTF(
+ ("get_soa: ns_samedomain('%s', '%s') == 0",
+ dname, t)
+ );
+ errno = EPROTOTYPE;
+ goto cleanup;
+ }
+ break;
+ case ns_s_ns:
+ if (ns_samename(dname, t) == 1 ||
+ ns_samedomain(dname, t) == 0) {
+ DPRINTF(
+ ("get_soa: ns_samename() || !ns_samedomain('%s', '%s')",
+ dname, t)
+ );
+ errno = EPROTOTYPE;
+ goto cleanup;
+ }
+ break;
+ default:
+ abort();
+ }
+ if (strlen(t) + 1 > zsize) {
+ DPRINTF(("get_soa: zname(%lu) too small (%lu)",
+ (unsigned long)zsize,
+ (unsigned long)strlen(t) + 1));
+ errno = EMSGSIZE;
+ goto cleanup;
+ }
+ strcpy(zname, t);
+ rdata = ns_rr_rdata(rr);
+ if (ns_name_uncompress(resp, ns_msg_end(msg), rdata,
+ mname, msize) < 0) {
+ DPRINTF(("get_soa: ns_name_uncompress failed")
+ );
+ goto cleanup;
+ }
+ if (save_ns(statp, &msg, ns_s_ns,
+ zname, class, opts, nsrrsp) < 0) {
+ DPRINTF(("get_soa: save_ns failed"));
+ goto cleanup;
+ }
+ free(resp);
+ return (0);
+ }
+
+ /* If we're out of labels, then not even "." has an SOA! */
+ if (*dname == '\0')
+ break;
+
+ /* Find label-terminating "."; top of loop will skip it. */
+ while (*dname != '.') {
+ if (*dname == '\\')
+ if (*++dname == '\0') {
+ errno = EMSGSIZE;
+ goto cleanup;
+ }
+ dname++;
+ }
+ }
+ DPRINTF(("get_soa: out of labels"));
+ errno = EDESTADDRREQ;
+ cleanup:
+ if (resp != NULL)
+ free(resp);
+ return (-1);
+}
+
+static int
+get_ns(res_state statp, const char *zname, ns_class class, int opts,
+ rrset_ns *nsrrsp)
+{
+ u_char *resp;
+ ns_msg msg;
+ int n;
+
+ resp = malloc(NS_MAXMSG);
+ if (resp == NULL)
+ return (-1);
+
+ /* Go and get the NS RRs for this zone. */
+ n = do_query(statp, zname, class, ns_t_ns, resp, &msg);
+ if (n != 0) {
+ DPRINTF(("get_ns: do_query('%s', %s) failed (%d)",
+ zname, p_class(class), n));
+ free(resp);
+ return (-1);
+ }
+
+ /* Remember the NS RRs and associated A RRs that came back. */
+ if (save_ns(statp, &msg, ns_s_an, zname, class, opts, nsrrsp) < 0) {
+ DPRINTF(("get_ns save_ns('%s', %s) failed",
+ zname, p_class(class)));
+ free(resp);
+ return (-1);
+ }
+
+ free(resp);
+ return (0);
+}
+
+static int
+get_glue(res_state statp, ns_class class, int opts, rrset_ns *nsrrsp) {
+ rr_ns *nsrr, *nsrr_n;
+ u_char *resp;
+
+ resp = malloc(NS_MAXMSG);
+ if (resp == NULL)
+ return(-1);
+
+ /* Go and get the A RRs for each empty NS RR on our list. */
+ for (nsrr = HEAD(*nsrrsp); nsrr != NULL; nsrr = nsrr_n) {
+ ns_msg msg;
+ int n;
+
+ nsrr_n = NEXT(nsrr, link);
+
+ if ((nsrr->flags & RR_NS_HAVE_V4) == 0) {
+ n = do_query(statp, nsrr->name, class, ns_t_a,
+ resp, &msg);
+ if (n < 0) {
+ DPRINTF(
+ ("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 ((nsrr->flags & RR_NS_HAVE_V6) == 0) {
+ n = do_query(statp, nsrr->name, class, ns_t_aaaa,
+ resp, &msg);
+ if (n < 0) {
+ DPRINTF(
+ ("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);
+}
+
+/*! \file */
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