/* $NetBSD: forward.c,v 1.7.2.2 2024/02/25 15:46:49 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ /*! \file */ #include #include #include #include #include #include #include #include struct dns_fwdtable { /* Unlocked. */ unsigned int magic; isc_mem_t *mctx; isc_rwlock_t rwlock; /* Locked by lock. */ dns_rbt_t *table; }; #define FWDTABLEMAGIC ISC_MAGIC('F', 'w', 'd', 'T') #define VALID_FWDTABLE(ft) ISC_MAGIC_VALID(ft, FWDTABLEMAGIC) static void auto_detach(void *, void *); isc_result_t dns_fwdtable_create(isc_mem_t *mctx, dns_fwdtable_t **fwdtablep) { dns_fwdtable_t *fwdtable; isc_result_t result; REQUIRE(fwdtablep != NULL && *fwdtablep == NULL); fwdtable = isc_mem_get(mctx, sizeof(*fwdtable)); fwdtable->table = NULL; result = dns_rbt_create(mctx, auto_detach, fwdtable, &fwdtable->table); if (result != ISC_R_SUCCESS) { goto cleanup_fwdtable; } isc_rwlock_init(&fwdtable->rwlock, 0, 0); fwdtable->mctx = NULL; isc_mem_attach(mctx, &fwdtable->mctx); fwdtable->magic = FWDTABLEMAGIC; *fwdtablep = fwdtable; return (ISC_R_SUCCESS); cleanup_fwdtable: isc_mem_put(mctx, fwdtable, sizeof(*fwdtable)); return (result); } isc_result_t dns_fwdtable_addfwd(dns_fwdtable_t *fwdtable, const dns_name_t *name, dns_forwarderlist_t *fwdrs, dns_fwdpolicy_t fwdpolicy) { isc_result_t result; dns_forwarders_t *forwarders; dns_forwarder_t *fwd, *nfwd; REQUIRE(VALID_FWDTABLE(fwdtable)); forwarders = isc_mem_get(fwdtable->mctx, sizeof(*forwarders)); ISC_LIST_INIT(forwarders->fwdrs); for (fwd = ISC_LIST_HEAD(*fwdrs); fwd != NULL; fwd = ISC_LIST_NEXT(fwd, link)) { nfwd = isc_mem_get(fwdtable->mctx, sizeof(*nfwd)); *nfwd = *fwd; ISC_LINK_INIT(nfwd, link); ISC_LIST_APPEND(forwarders->fwdrs, nfwd, link); } forwarders->fwdpolicy = fwdpolicy; RWLOCK(&fwdtable->rwlock, isc_rwlocktype_write); result = dns_rbt_addname(fwdtable->table, name, forwarders); RWUNLOCK(&fwdtable->rwlock, isc_rwlocktype_write); if (result != ISC_R_SUCCESS) { goto cleanup; } return (ISC_R_SUCCESS); cleanup: while (!ISC_LIST_EMPTY(forwarders->fwdrs)) { fwd = ISC_LIST_HEAD(forwarders->fwdrs); ISC_LIST_UNLINK(forwarders->fwdrs, fwd, link); isc_mem_put(fwdtable->mctx, fwd, sizeof(*fwd)); } isc_mem_put(fwdtable->mctx, forwarders, sizeof(*forwarders)); return (result); } isc_result_t dns_fwdtable_add(dns_fwdtable_t *fwdtable, const dns_name_t *name, isc_sockaddrlist_t *addrs, dns_fwdpolicy_t fwdpolicy) { isc_result_t result; dns_forwarders_t *forwarders; dns_forwarder_t *fwd; isc_sockaddr_t *sa; REQUIRE(VALID_FWDTABLE(fwdtable)); forwarders = isc_mem_get(fwdtable->mctx, sizeof(*forwarders)); ISC_LIST_INIT(forwarders->fwdrs); for (sa = ISC_LIST_HEAD(*addrs); sa != NULL; sa = ISC_LIST_NEXT(sa, link)) { fwd = isc_mem_get(fwdtable->mctx, sizeof(*fwd)); fwd->addr = *sa; ISC_LINK_INIT(fwd, link); ISC_LIST_APPEND(forwarders->fwdrs, fwd, link); } forwarders->fwdpolicy = fwdpolicy; RWLOCK(&fwdtable->rwlock, isc_rwlocktype_write); result = dns_rbt_addname(fwdtable->table, name, forwarders); RWUNLOCK(&fwdtable->rwlock, isc_rwlocktype_write); if (result != ISC_R_SUCCESS) { goto cleanup; } return (ISC_R_SUCCESS); cleanup: while (!ISC_LIST_EMPTY(forwarders->fwdrs)) { fwd = ISC_LIST_HEAD(forwarders->fwdrs); ISC_LIST_UNLINK(forwarders->fwdrs, fwd, link); isc_mem_put(fwdtable->mctx, fwd, sizeof(*fwd)); } isc_mem_put(fwdtable->mctx, forwarders, sizeof(*forwarders)); return (result); } isc_result_t dns_fwdtable_delete(dns_fwdtable_t *fwdtable, const dns_name_t *name) { isc_result_t result; REQUIRE(VALID_FWDTABLE(fwdtable)); RWLOCK(&fwdtable->rwlock, isc_rwlocktype_write); result = dns_rbt_deletename(fwdtable->table, name, false); RWUNLOCK(&fwdtable->rwlock, isc_rwlocktype_write); return (result); } isc_result_t dns_fwdtable_find(dns_fwdtable_t *fwdtable, const dns_name_t *name, dns_name_t *foundname, dns_forwarders_t **forwardersp) { isc_result_t result; REQUIRE(VALID_FWDTABLE(fwdtable)); RWLOCK(&fwdtable->rwlock, isc_rwlocktype_read); result = dns_rbt_findname(fwdtable->table, name, 0, foundname, (void **)forwardersp); RWUNLOCK(&fwdtable->rwlock, isc_rwlocktype_read); return (result); } void dns_fwdtable_destroy(dns_fwdtable_t **fwdtablep) { dns_fwdtable_t *fwdtable; REQUIRE(fwdtablep != NULL && VALID_FWDTABLE(*fwdtablep)); fwdtable = *fwdtablep; *fwdtablep = NULL; dns_rbt_destroy(&fwdtable->table); isc_rwlock_destroy(&fwdtable->rwlock); fwdtable->magic = 0; isc_mem_putanddetach(&fwdtable->mctx, fwdtable, sizeof(*fwdtable)); } /*** *** Private ***/ static void auto_detach(void *data, void *arg) { dns_forwarders_t *forwarders = data; dns_fwdtable_t *fwdtable = arg; dns_forwarder_t *fwd; UNUSED(arg); while (!ISC_LIST_EMPTY(forwarders->fwdrs)) { fwd = ISC_LIST_HEAD(forwarders->fwdrs); ISC_LIST_UNLINK(forwarders->fwdrs, fwd, link); isc_mem_put(fwdtable->mctx, fwd, sizeof(*fwd)); } isc_mem_put(fwdtable->mctx, forwarders, sizeof(*forwarders)); }