00b67f09dd
Also known as ISC bind. This import adds utilities such as host(1), dig(1), and nslookup(1), as well as many other tools and libraries. Change-Id: I035ca46e64f1965d57019e773f4ff0ef035e4aa3
269 lines
6.8 KiB
C
269 lines
6.8 KiB
C
/* $NetBSD: forward.c,v 1.5 2014/12/10 04:37:58 christos Exp $ */
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/*
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* Copyright (C) 2004, 2005, 2007, 2009, 2013 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 2000, 2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or 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 WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Id: forward.c,v 1.14 2009/09/02 23:48:02 tbox Exp */
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/*! \file */
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#include <config.h>
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#include <isc/magic.h>
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#include <isc/mem.h>
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#include <isc/rwlock.h>
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#include <isc/sockaddr.h>
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#include <isc/util.h>
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#include <dns/forward.h>
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#include <dns/rbt.h>
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#include <dns/result.h>
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#include <dns/types.h>
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struct dns_fwdtable {
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/* Unlocked. */
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unsigned int magic;
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isc_mem_t *mctx;
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isc_rwlock_t rwlock;
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/* Locked by lock. */
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dns_rbt_t *table;
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};
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#define FWDTABLEMAGIC ISC_MAGIC('F', 'w', 'd', 'T')
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#define VALID_FWDTABLE(ft) ISC_MAGIC_VALID(ft, FWDTABLEMAGIC)
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static void
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auto_detach(void *, void *);
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isc_result_t
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dns_fwdtable_create(isc_mem_t *mctx, dns_fwdtable_t **fwdtablep) {
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dns_fwdtable_t *fwdtable;
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isc_result_t result;
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REQUIRE(fwdtablep != NULL && *fwdtablep == NULL);
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fwdtable = isc_mem_get(mctx, sizeof(dns_fwdtable_t));
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if (fwdtable == NULL)
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return (ISC_R_NOMEMORY);
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fwdtable->table = NULL;
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result = dns_rbt_create(mctx, auto_detach, fwdtable, &fwdtable->table);
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if (result != ISC_R_SUCCESS)
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goto cleanup_fwdtable;
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result = isc_rwlock_init(&fwdtable->rwlock, 0, 0);
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if (result != ISC_R_SUCCESS)
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goto cleanup_rbt;
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fwdtable->mctx = NULL;
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isc_mem_attach(mctx, &fwdtable->mctx);
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fwdtable->magic = FWDTABLEMAGIC;
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*fwdtablep = fwdtable;
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return (ISC_R_SUCCESS);
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cleanup_rbt:
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dns_rbt_destroy(&fwdtable->table);
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cleanup_fwdtable:
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isc_mem_put(mctx, fwdtable, sizeof(dns_fwdtable_t));
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return (result);
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}
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isc_result_t
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dns_fwdtable_addfwd(dns_fwdtable_t *fwdtable, dns_name_t *name,
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dns_forwarderlist_t *fwdrs, dns_fwdpolicy_t fwdpolicy)
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{
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isc_result_t result;
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dns_forwarders_t *forwarders;
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dns_forwarder_t *fwd, *nfwd;
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REQUIRE(VALID_FWDTABLE(fwdtable));
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forwarders = isc_mem_get(fwdtable->mctx, sizeof(dns_forwarders_t));
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if (forwarders == NULL)
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return (ISC_R_NOMEMORY);
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ISC_LIST_INIT(forwarders->fwdrs);
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for (fwd = ISC_LIST_HEAD(*fwdrs);
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fwd != NULL;
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fwd = ISC_LIST_NEXT(fwd, link))
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{
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nfwd = isc_mem_get(fwdtable->mctx, sizeof(dns_forwarder_t));
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if (nfwd == NULL) {
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result = ISC_R_NOMEMORY;
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goto cleanup;
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}
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*nfwd = *fwd;
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ISC_LINK_INIT(nfwd, link);
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ISC_LIST_APPEND(forwarders->fwdrs, nfwd, link);
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}
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forwarders->fwdpolicy = fwdpolicy;
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RWLOCK(&fwdtable->rwlock, isc_rwlocktype_write);
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result = dns_rbt_addname(fwdtable->table, name, forwarders);
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RWUNLOCK(&fwdtable->rwlock, isc_rwlocktype_write);
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if (result != ISC_R_SUCCESS)
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goto cleanup;
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return (ISC_R_SUCCESS);
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cleanup:
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while (!ISC_LIST_EMPTY(forwarders->fwdrs)) {
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fwd = ISC_LIST_HEAD(forwarders->fwdrs);
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ISC_LIST_UNLINK(forwarders->fwdrs, fwd, link);
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isc_mem_put(fwdtable->mctx, fwd, sizeof(isc_sockaddr_t));
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}
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isc_mem_put(fwdtable->mctx, forwarders, sizeof(dns_forwarders_t));
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return (result);
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}
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isc_result_t
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dns_fwdtable_add(dns_fwdtable_t *fwdtable, dns_name_t *name,
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isc_sockaddrlist_t *addrs, dns_fwdpolicy_t fwdpolicy)
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{
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isc_result_t result;
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dns_forwarders_t *forwarders;
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dns_forwarder_t *fwd;
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isc_sockaddr_t *sa;
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REQUIRE(VALID_FWDTABLE(fwdtable));
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forwarders = isc_mem_get(fwdtable->mctx, sizeof(dns_forwarders_t));
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if (forwarders == NULL)
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return (ISC_R_NOMEMORY);
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ISC_LIST_INIT(forwarders->fwdrs);
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for (sa = ISC_LIST_HEAD(*addrs);
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sa != NULL;
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sa = ISC_LIST_NEXT(sa, link))
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{
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fwd = isc_mem_get(fwdtable->mctx, sizeof(dns_forwarder_t));
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if (fwd == NULL) {
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result = ISC_R_NOMEMORY;
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goto cleanup;
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}
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fwd->addr = *sa;
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fwd->dscp = -1;
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ISC_LINK_INIT(fwd, link);
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ISC_LIST_APPEND(forwarders->fwdrs, fwd, link);
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}
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forwarders->fwdpolicy = fwdpolicy;
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RWLOCK(&fwdtable->rwlock, isc_rwlocktype_write);
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result = dns_rbt_addname(fwdtable->table, name, forwarders);
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RWUNLOCK(&fwdtable->rwlock, isc_rwlocktype_write);
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if (result != ISC_R_SUCCESS)
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goto cleanup;
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return (ISC_R_SUCCESS);
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cleanup:
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while (!ISC_LIST_EMPTY(forwarders->fwdrs)) {
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fwd = ISC_LIST_HEAD(forwarders->fwdrs);
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ISC_LIST_UNLINK(forwarders->fwdrs, fwd, link);
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isc_mem_put(fwdtable->mctx, fwd, sizeof(dns_forwarder_t));
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}
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isc_mem_put(fwdtable->mctx, forwarders, sizeof(dns_forwarders_t));
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return (result);
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}
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isc_result_t
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dns_fwdtable_delete(dns_fwdtable_t *fwdtable, dns_name_t *name) {
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isc_result_t result;
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REQUIRE(VALID_FWDTABLE(fwdtable));
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RWLOCK(&fwdtable->rwlock, isc_rwlocktype_write);
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result = dns_rbt_deletename(fwdtable->table, name, ISC_FALSE);
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RWUNLOCK(&fwdtable->rwlock, isc_rwlocktype_write);
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if (result == DNS_R_PARTIALMATCH)
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result = ISC_R_NOTFOUND;
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return (result);
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}
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isc_result_t
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dns_fwdtable_find(dns_fwdtable_t *fwdtable, dns_name_t *name,
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dns_forwarders_t **forwardersp)
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{
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return (dns_fwdtable_find2(fwdtable, name, NULL, forwardersp));
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}
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isc_result_t
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dns_fwdtable_find2(dns_fwdtable_t *fwdtable, dns_name_t *name,
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dns_name_t *foundname, dns_forwarders_t **forwardersp)
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{
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isc_result_t result;
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REQUIRE(VALID_FWDTABLE(fwdtable));
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RWLOCK(&fwdtable->rwlock, isc_rwlocktype_read);
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result = dns_rbt_findname(fwdtable->table, name, 0, foundname,
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(void **)forwardersp);
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if (result == DNS_R_PARTIALMATCH)
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result = ISC_R_SUCCESS;
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RWUNLOCK(&fwdtable->rwlock, isc_rwlocktype_read);
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return (result);
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}
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void
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dns_fwdtable_destroy(dns_fwdtable_t **fwdtablep) {
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dns_fwdtable_t *fwdtable;
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isc_mem_t *mctx;
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REQUIRE(fwdtablep != NULL && VALID_FWDTABLE(*fwdtablep));
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fwdtable = *fwdtablep;
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dns_rbt_destroy(&fwdtable->table);
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isc_rwlock_destroy(&fwdtable->rwlock);
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fwdtable->magic = 0;
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mctx = fwdtable->mctx;
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isc_mem_put(mctx, fwdtable, sizeof(dns_fwdtable_t));
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isc_mem_detach(&mctx);
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*fwdtablep = NULL;
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}
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/***
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*** Private
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***/
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static void
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auto_detach(void *data, void *arg) {
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dns_forwarders_t *forwarders = data;
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dns_fwdtable_t *fwdtable = arg;
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dns_forwarder_t *fwd;
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UNUSED(arg);
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while (!ISC_LIST_EMPTY(forwarders->fwdrs)) {
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fwd = ISC_LIST_HEAD(forwarders->fwdrs);
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ISC_LIST_UNLINK(forwarders->fwdrs, fwd, link);
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isc_mem_put(fwdtable->mctx, fwd, sizeof(dns_forwarder_t));
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}
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isc_mem_put(fwdtable->mctx, forwarders, sizeof(dns_forwarders_t));
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}
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