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Diffstat (limited to '')
| -rw-r--r-- | bin/tests/system/dyndb/driver/syncptr.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/bin/tests/system/dyndb/driver/syncptr.c b/bin/tests/system/dyndb/driver/syncptr.c new file mode 100644 index 0000000..cfed153 --- /dev/null +++ b/bin/tests/system/dyndb/driver/syncptr.c @@ -0,0 +1,337 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * SPDX-License-Identifier: MPL-2.0 AND ISC + * + * 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. + */ + +/* + * Copyright (C) Red Hat + * + * Permission to use, copy, modify, and/or 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 AUTHORS 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. + */ + +/* + * Automatic A/AAAA/PTR record synchronization. + */ + +#include "syncptr.h" + +#include <isc/event.h> +#include <isc/eventclass.h> +#include <isc/netaddr.h> +#include <isc/task.h> +#include <isc/util.h> + +#include <dns/byaddr.h> +#include <dns/db.h> +#include <dns/name.h> +#include <dns/view.h> +#include <dns/zone.h> + +#include "instance.h" +#include "util.h" + +/* Almost random value. See eventclass.h */ +#define SYNCPTR_WRITE_EVENT (ISC_EVENTCLASS(1025) + 1) + +/* + * Event used for making changes to reverse zones. + */ +typedef struct syncptrevent syncptrevent_t; +struct syncptrevent { + ISC_EVENT_COMMON(syncptrevent_t); + isc_mem_t *mctx; + dns_zone_t *zone; + dns_diff_t diff; + dns_fixedname_t ptr_target_name; /* referenced by owner name in + * tuple */ + isc_buffer_t b; /* referenced by target name in tuple */ + unsigned char buf[DNS_NAME_MAXWIRE]; +}; + +/* + * Write diff generated in syncptr() to reverse zone. + * + * This function will be called asynchronously and syncptr() will not get + * any result from it. + * + */ +static void +syncptr_write(isc_task_t *task, isc_event_t *event) { + syncptrevent_t *pevent = (syncptrevent_t *)event; + dns_dbversion_t *version = NULL; + dns_db_t *db = NULL; + isc_result_t result; + + REQUIRE(event->ev_type == SYNCPTR_WRITE_EVENT); + + UNUSED(task); + + log_write(ISC_LOG_INFO, "ENTER: syncptr_write"); + + result = dns_zone_getdb(pevent->zone, &db); + if (result != ISC_R_SUCCESS) { + log_write(ISC_LOG_ERROR, + "syncptr_write: dns_zone_getdb -> %s\n", + isc_result_totext(result)); + goto cleanup; + } + + result = dns_db_newversion(db, &version); + if (result != ISC_R_SUCCESS) { + log_write(ISC_LOG_ERROR, + "syncptr_write: dns_db_newversion -> %s\n", + isc_result_totext(result)); + goto cleanup; + } + result = dns_diff_apply(&pevent->diff, db, version); + if (result != ISC_R_SUCCESS) { + log_write(ISC_LOG_ERROR, + "syncptr_write: dns_diff_apply -> %s\n", + isc_result_totext(result)); + goto cleanup; + } + +cleanup: + if (db != NULL) { + if (version != NULL) { + dns_db_closeversion(db, &version, true); + } + dns_db_detach(&db); + } + dns_zone_detach(&pevent->zone); + dns_diff_clear(&pevent->diff); + isc_event_free(&event); +} + +/* + * Find a reverse zone for given IP address. + * + * @param[in] rdata IP address as A/AAAA record + * @param[out] name Owner name for the PTR record + * @param[out] zone DNS zone for reverse record matching the IP address + * + * @retval ISC_R_SUCCESS DNS name derived from given IP address belongs to an + * reverse zone managed by this driver instance. + * PTR record synchronization can continue. + * @retval ISC_R_NOTFOUND Suitable reverse zone was not found because it + * does not exist or is not managed by this driver. + */ +static isc_result_t +syncptr_find_zone(sample_instance_t *inst, dns_rdata_t *rdata, dns_name_t *name, + dns_zone_t **zone) { + isc_result_t result; + isc_netaddr_t isc_ip; /* internal net address representation */ + dns_rdata_in_a_t ipv4; + dns_rdata_in_aaaa_t ipv6; + + REQUIRE(inst != NULL); + REQUIRE(zone != NULL && *zone == NULL); + + switch (rdata->type) { + case dns_rdatatype_a: + CHECK(dns_rdata_tostruct(rdata, &ipv4, inst->mctx)); + isc_netaddr_fromin(&isc_ip, &ipv4.in_addr); + break; + + case dns_rdatatype_aaaa: + CHECK(dns_rdata_tostruct(rdata, &ipv6, inst->mctx)); + isc_netaddr_fromin6(&isc_ip, &ipv6.in6_addr); + break; + + default: + fatal_error("unsupported address type 0x%x", rdata->type); + break; + } + + /* + * Convert IP address to PTR owner name. + * + * @example + * 192.168.0.1 -> 1.0.168.192.in-addr.arpa + */ + result = dns_byaddr_createptrname(&isc_ip, 0, name); + if (result != ISC_R_SUCCESS) { + log_write(ISC_LOG_ERROR, + "syncptr_find_zone: dns_byaddr_createptrname -> %s\n", + isc_result_totext(result)); + goto cleanup; + } + + /* Find a zone containing owner name of the PTR record. */ + result = dns_zt_find(inst->view->zonetable, name, 0, NULL, zone); + if (result == DNS_R_PARTIALMATCH) { + result = ISC_R_SUCCESS; + } else if (result != ISC_R_SUCCESS) { + log_write(ISC_LOG_ERROR, + "syncptr_find_zone: dns_zt_find -> %s\n", + isc_result_totext(result)); + goto cleanup; + } + + /* Make sure that the zone is managed by this driver. */ + if (*zone != inst->zone1 && *zone != inst->zone2) { + dns_zone_detach(zone); + log_write(ISC_LOG_INFO, "syncptr_find_zone: zone not managed"); + result = ISC_R_NOTFOUND; + } + +cleanup: + if (rdata->type == dns_rdatatype_a) { + dns_rdata_freestruct(&ipv4); + } else { + dns_rdata_freestruct(&ipv6); + } + + return (result); +} + +/* + * Generate update event for PTR record to reflect change in A/AAAA record. + * + * @pre Reverse zone is managed by this driver. + * + * @param[in] a_name DNS domain of modified A/AAAA record + * @param[in] af Address family + * @param[in] ip_str IP address as a string (IPv4 or IPv6) + * @param[in] mod_op LDAP_MOD_DELETE if A/AAAA record is being deleted + * or LDAP_MOD_ADD if A/AAAA record is being added. + * + * @retval ISC_R_SUCCESS Event for PTR record update was generated and send. + * Change to reverse zone will be done asynchronously. + * @retval other Synchronization failed - reverse doesn't exist, + * is not managed by this driver instance, + * memory allocation error, etc. + */ +static isc_result_t +syncptr(sample_instance_t *inst, dns_name_t *name, dns_rdata_t *addr_rdata, + dns_ttl_t ttl, dns_diffop_t op) { + isc_result_t result; + isc_mem_t *mctx = inst->mctx; + dns_fixedname_t ptr_name; + dns_zone_t *ptr_zone = NULL; + dns_rdata_ptr_t ptr_struct; + dns_rdata_t ptr_rdata = DNS_RDATA_INIT; + dns_difftuple_t *tp = NULL; + isc_task_t *task = NULL; + syncptrevent_t *pevent = NULL; + + dns_fixedname_init(&ptr_name); + DNS_RDATACOMMON_INIT(&ptr_struct, dns_rdatatype_ptr, dns_rdataclass_in); + dns_name_init(&ptr_struct.ptr, NULL); + + pevent = (syncptrevent_t *)isc_event_allocate( + inst->mctx, inst, SYNCPTR_WRITE_EVENT, syncptr_write, NULL, + sizeof(syncptrevent_t)); + isc_buffer_init(&pevent->b, pevent->buf, sizeof(pevent->buf)); + dns_fixedname_init(&pevent->ptr_target_name); + + /* Check if reverse zone is managed by this driver */ + result = syncptr_find_zone(inst, addr_rdata, + dns_fixedname_name(&ptr_name), &ptr_zone); + if (result != ISC_R_SUCCESS) { + log_error_r("PTR record synchronization skipped: reverse zone " + "is not managed by driver instance '%s'", + inst->db_name); + goto cleanup; + } + + /* Reverse zone is managed by this driver, prepare PTR record */ + pevent->zone = NULL; + dns_zone_attach(ptr_zone, &pevent->zone); + dns_name_copynf(name, dns_fixedname_name(&pevent->ptr_target_name)); + dns_name_clone(dns_fixedname_name(&pevent->ptr_target_name), + &ptr_struct.ptr); + dns_diff_init(inst->mctx, &pevent->diff); + result = dns_rdata_fromstruct(&ptr_rdata, dns_rdataclass_in, + dns_rdatatype_ptr, &ptr_struct, + &pevent->b); + if (result != ISC_R_SUCCESS) { + log_write(ISC_LOG_ERROR, + "syncptr: dns_rdata_fromstruct -> %s\n", + isc_result_totext(result)); + goto cleanup; + } + + /* Create diff */ + result = dns_difftuple_create(mctx, op, dns_fixedname_name(&ptr_name), + ttl, &ptr_rdata, &tp); + if (result != ISC_R_SUCCESS) { + log_write(ISC_LOG_ERROR, + "syncptr: dns_difftuple_create -> %s\n", + isc_result_totext(result)); + goto cleanup; + } + dns_diff_append(&pevent->diff, &tp); + + /* + * Send update event to the reverse zone. + * It will be processed asynchronously. + */ + dns_zone_gettask(ptr_zone, &task); + isc_task_send(task, (isc_event_t **)&pevent); + +cleanup: + if (ptr_zone != NULL) { + dns_zone_detach(&ptr_zone); + } + if (tp != NULL) { + dns_difftuple_free(&tp); + } + if (task != NULL) { + isc_task_detach(&task); + } + if (pevent != NULL) { + isc_event_free((isc_event_t **)&pevent); + } + + return (result); +} + +/* + * Generate update event for every rdata in rdataset. + * + * @param[in] name Owner name for A/AAAA records in rdataset. + * @param[in] rdataset A/AAAA records. + * @param[in] op DNS_DIFFOP_ADD / DNS_DIFFOP_DEL for adding / deleting + * the rdata + */ +isc_result_t +syncptrs(sample_instance_t *inst, dns_name_t *name, dns_rdataset_t *rdataset, + dns_diffop_t op) { + isc_result_t result; + dns_rdata_t rdata = DNS_RDATA_INIT; + + for (result = dns_rdataset_first(rdataset); result == ISC_R_SUCCESS; + result = dns_rdataset_next(rdataset)) + { + dns_rdataset_current(rdataset, &rdata); + result = syncptr(inst, name, &rdata, rdataset->ttl, op); + if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND) { + goto cleanup; + } + } + if (result == ISC_R_NOMORE) { + result = ISC_R_SUCCESS; + } + +cleanup: + return (result); +} |