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-rw-r--r--lib/ns/client.c3053
1 files changed, 3053 insertions, 0 deletions
diff --git a/lib/ns/client.c b/lib/ns/client.c
new file mode 100644
index 0000000..d4ce000
--- /dev/null
+++ b/lib/ns/client.c
@@ -0,0 +1,3053 @@
+/*
+ * 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.
+ */
+
+#include <inttypes.h>
+#include <limits.h>
+#include <stdbool.h>
+
+#include <isc/aes.h>
+#include <isc/atomic.h>
+#include <isc/formatcheck.h>
+#include <isc/fuzz.h>
+#include <isc/hmac.h>
+#include <isc/mutex.h>
+#include <isc/nonce.h>
+#include <isc/once.h>
+#include <isc/platform.h>
+#include <isc/print.h>
+#include <isc/random.h>
+#include <isc/safe.h>
+#include <isc/serial.h>
+#include <isc/siphash.h>
+#include <isc/stats.h>
+#include <isc/stdio.h>
+#include <isc/string.h>
+#include <isc/task.h>
+#include <isc/timer.h>
+#include <isc/util.h>
+
+#include <dns/adb.h>
+#include <dns/badcache.h>
+#include <dns/cache.h>
+#include <dns/db.h>
+#include <dns/dispatch.h>
+#include <dns/dnstap.h>
+#include <dns/edns.h>
+#include <dns/events.h>
+#include <dns/message.h>
+#include <dns/peer.h>
+#include <dns/rcode.h>
+#include <dns/rdata.h>
+#include <dns/rdataclass.h>
+#include <dns/rdatalist.h>
+#include <dns/rdataset.h>
+#include <dns/resolver.h>
+#include <dns/stats.h>
+#include <dns/tsig.h>
+#include <dns/view.h>
+#include <dns/zone.h>
+
+#include <ns/client.h>
+#include <ns/interfacemgr.h>
+#include <ns/log.h>
+#include <ns/notify.h>
+#include <ns/server.h>
+#include <ns/stats.h>
+#include <ns/update.h>
+
+#ifndef _POSIX_HOST_NAME_MAX
+#define _POSIX_HOST_NAME_MAX 255
+#endif
+
+/***
+ *** Client
+ ***/
+
+/*! \file
+ * Client Routines
+ *
+ * Important note!
+ *
+ * All client state changes, other than that from idle to listening, occur
+ * as a result of events. This guarantees serialization and avoids the
+ * need for locking.
+ *
+ * If a routine is ever created that allows someone other than the client's
+ * task to change the client, then the client will have to be locked.
+ */
+
+#ifdef NS_CLIENT_TRACE
+#define CTRACE(m) \
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT, NS_LOGMODULE_CLIENT, \
+ ISC_LOG_DEBUG(3), "%s", (m))
+#define MTRACE(m) \
+ isc_log_write(ns_lctx, NS_LOGCATEGORY_CLIENT, NS_LOGMODULE_CLIENT, \
+ ISC_LOG_DEBUG(3), "clientmgr @%p: %s", manager, (m))
+#else /* ifdef NS_CLIENT_TRACE */
+#define CTRACE(m) ((void)(m))
+#define MTRACE(m) ((void)(m))
+#endif /* ifdef NS_CLIENT_TRACE */
+
+#define TCP_CLIENT(c) (((c)->attributes & NS_CLIENTATTR_TCP) != 0)
+
+#define COOKIE_SIZE 24U /* 8 + 4 + 4 + 8 */
+#define ECS_SIZE 20U /* 2 + 1 + 1 + [0..16] */
+
+#define WANTNSID(x) (((x)->attributes & NS_CLIENTATTR_WANTNSID) != 0)
+#define WANTEXPIRE(x) (((x)->attributes & NS_CLIENTATTR_WANTEXPIRE) != 0)
+#define WANTPAD(x) (((x)->attributes & NS_CLIENTATTR_WANTPAD) != 0)
+#define USEKEEPALIVE(x) (((x)->attributes & NS_CLIENTATTR_USEKEEPALIVE) != 0)
+
+#define MANAGER_MAGIC ISC_MAGIC('N', 'S', 'C', 'm')
+#define VALID_MANAGER(m) ISC_MAGIC_VALID(m, MANAGER_MAGIC)
+
+/*
+ * Enable ns_client_dropport() by default.
+ */
+#ifndef NS_CLIENT_DROPPORT
+#define NS_CLIENT_DROPPORT 1
+#endif /* ifndef NS_CLIENT_DROPPORT */
+
+#define CLIENT_NMCTXS_PERCPU 8
+/*%<
+ * Number of 'mctx pools' for clients. (Should this be configurable?)
+ * When enabling threads, we use a pool of memory contexts shared by
+ * client objects, since concurrent access to a shared context would cause
+ * heavy contentions. The above constant is expected to be enough for
+ * completely avoiding contentions among threads for an authoritative-only
+ * server.
+ */
+
+#define CLIENT_NTASKS_PERCPU 32
+/*%<
+ * Number of tasks to be used by clients - those are used only when recursing
+ */
+
+#if defined(_WIN32) && !defined(_WIN64)
+LIBNS_EXTERNAL_DATA atomic_uint_fast32_t ns_client_requests = 0;
+#else /* if defined(_WIN32) && !defined(_WIN64) */
+LIBNS_EXTERNAL_DATA atomic_uint_fast64_t ns_client_requests = 0;
+#endif /* if defined(_WIN32) && !defined(_WIN64) */
+
+static void
+clientmgr_attach(ns_clientmgr_t *source, ns_clientmgr_t **targetp);
+static void
+clientmgr_detach(ns_clientmgr_t **mp);
+static void
+clientmgr_destroy(ns_clientmgr_t *manager);
+static void
+ns_client_endrequest(ns_client_t *client);
+static void
+ns_client_dumpmessage(ns_client_t *client, const char *reason);
+static void
+compute_cookie(ns_client_t *client, uint32_t when, uint32_t nonce,
+ const unsigned char *secret, isc_buffer_t *buf);
+static void
+get_clientmctx(ns_clientmgr_t *manager, isc_mem_t **mctxp);
+static void
+get_clienttask(ns_clientmgr_t *manager, isc_task_t **taskp);
+
+void
+ns_client_recursing(ns_client_t *client) {
+ REQUIRE(NS_CLIENT_VALID(client));
+ REQUIRE(client->state == NS_CLIENTSTATE_WORKING);
+
+ LOCK(&client->manager->reclock);
+ client->state = NS_CLIENTSTATE_RECURSING;
+ ISC_LIST_APPEND(client->manager->recursing, client, rlink);
+ UNLOCK(&client->manager->reclock);
+}
+
+void
+ns_client_killoldestquery(ns_client_t *client) {
+ ns_client_t *oldest;
+ REQUIRE(NS_CLIENT_VALID(client));
+
+ LOCK(&client->manager->reclock);
+ oldest = ISC_LIST_HEAD(client->manager->recursing);
+ if (oldest != NULL) {
+ ISC_LIST_UNLINK(client->manager->recursing, oldest, rlink);
+ ns_query_cancel(oldest);
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_reclimitdropped);
+ }
+ UNLOCK(&client->manager->reclock);
+}
+
+void
+ns_client_settimeout(ns_client_t *client, unsigned int seconds) {
+ UNUSED(client);
+ UNUSED(seconds);
+ /* XXXWPK TODO use netmgr to set timeout */
+}
+
+static void
+ns_client_endrequest(ns_client_t *client) {
+ INSIST(client->nupdates == 0);
+ INSIST(client->state == NS_CLIENTSTATE_WORKING ||
+ client->state == NS_CLIENTSTATE_RECURSING);
+
+ CTRACE("endrequest");
+
+ if (client->state == NS_CLIENTSTATE_RECURSING) {
+ LOCK(&client->manager->reclock);
+ if (ISC_LINK_LINKED(client, rlink)) {
+ ISC_LIST_UNLINK(client->manager->recursing, client,
+ rlink);
+ }
+ UNLOCK(&client->manager->reclock);
+ }
+
+ if (client->cleanup != NULL) {
+ (client->cleanup)(client);
+ client->cleanup = NULL;
+ }
+
+ if (client->view != NULL) {
+#ifdef ENABLE_AFL
+ if (client->sctx->fuzztype == isc_fuzz_resolver) {
+ dns_cache_clean(client->view->cache, INT_MAX);
+ dns_adb_flush(client->view->adb);
+ }
+#endif /* ifdef ENABLE_AFL */
+ dns_view_detach(&client->view);
+ }
+ if (client->opt != NULL) {
+ INSIST(dns_rdataset_isassociated(client->opt));
+ dns_rdataset_disassociate(client->opt);
+ dns_message_puttemprdataset(client->message, &client->opt);
+ }
+
+ client->signer = NULL;
+ client->udpsize = 512;
+ client->extflags = 0;
+ client->ednsversion = -1;
+ dns_ecs_init(&client->ecs);
+ dns_message_reset(client->message, DNS_MESSAGE_INTENTPARSE);
+
+ /*
+ * Clean up from recursion - normally this would be done in
+ * fetch_callback(), but if we're shutting down and canceling then
+ * it might not have happened.
+ */
+ if (client->recursionquota != NULL) {
+ isc_quota_detach(&client->recursionquota);
+ ns_stats_decrement(client->sctx->nsstats,
+ ns_statscounter_recursclients);
+ }
+
+ /*
+ * Clear all client attributes that are specific to the request
+ */
+ client->attributes = 0;
+#ifdef ENABLE_AFL
+ if (client->sctx->fuzznotify != NULL &&
+ (client->sctx->fuzztype == isc_fuzz_client ||
+ client->sctx->fuzztype == isc_fuzz_tcpclient ||
+ client->sctx->fuzztype == isc_fuzz_resolver))
+ {
+ client->sctx->fuzznotify();
+ }
+#endif /* ENABLE_AFL */
+}
+
+void
+ns_client_drop(ns_client_t *client, isc_result_t result) {
+ REQUIRE(NS_CLIENT_VALID(client));
+ REQUIRE(client->state == NS_CLIENTSTATE_WORKING ||
+ client->state == NS_CLIENTSTATE_RECURSING);
+
+ CTRACE("drop");
+ if (result != ISC_R_SUCCESS) {
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(3),
+ "request failed: %s", isc_result_totext(result));
+ }
+}
+
+static void
+client_senddone(isc_nmhandle_t *handle, isc_result_t result, void *cbarg) {
+ ns_client_t *client = cbarg;
+
+ REQUIRE(client->sendhandle == handle);
+
+ CTRACE("senddone");
+
+ /*
+ * Set sendhandle to NULL, but don't detach it immediately, in
+ * case we need to retry the send. If we do resend, then
+ * sendhandle will be reattached. Whether or not we resend,
+ * we will then detach the handle from *this* send by detaching
+ * 'handle' directly below.
+ */
+ client->sendhandle = NULL;
+
+ if (result != ISC_R_SUCCESS) {
+ if (!TCP_CLIENT(client) && result == ISC_R_MAXSIZE) {
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(3),
+ "send exceeded maximum size: truncating");
+ client->query.attributes &= ~NS_QUERYATTR_ANSWERED;
+ client->rcode_override = dns_rcode_noerror;
+ ns_client_error(client, ISC_R_MAXSIZE);
+ } else {
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(3),
+ "send failed: %s",
+ isc_result_totext(result));
+ }
+ }
+
+ isc_nmhandle_detach(&handle);
+}
+
+static void
+client_allocsendbuf(ns_client_t *client, isc_buffer_t *buffer,
+ unsigned char **datap) {
+ unsigned char *data;
+ uint32_t bufsize;
+
+ REQUIRE(datap != NULL);
+
+ if (TCP_CLIENT(client)) {
+ INSIST(client->tcpbuf == NULL);
+ client->tcpbuf = isc_mem_get(client->mctx,
+ NS_CLIENT_TCP_BUFFER_SIZE);
+ data = client->tcpbuf;
+ isc_buffer_init(buffer, data, NS_CLIENT_TCP_BUFFER_SIZE);
+ } else {
+ data = client->sendbuf;
+ if ((client->attributes & NS_CLIENTATTR_HAVECOOKIE) == 0) {
+ if (client->view != NULL) {
+ bufsize = client->view->nocookieudp;
+ } else {
+ bufsize = 512;
+ }
+ } else {
+ bufsize = client->udpsize;
+ }
+ if (bufsize > client->udpsize) {
+ bufsize = client->udpsize;
+ }
+ if (bufsize > NS_CLIENT_SEND_BUFFER_SIZE) {
+ bufsize = NS_CLIENT_SEND_BUFFER_SIZE;
+ }
+ isc_buffer_init(buffer, data, bufsize);
+ }
+ *datap = data;
+}
+
+static void
+client_sendpkg(ns_client_t *client, isc_buffer_t *buffer) {
+ isc_region_t r;
+
+ REQUIRE(client->sendhandle == NULL);
+
+ isc_buffer_usedregion(buffer, &r);
+ isc_nmhandle_attach(client->handle, &client->sendhandle);
+ isc_nm_send(client->handle, &r, client_senddone, client);
+}
+
+void
+ns_client_sendraw(ns_client_t *client, dns_message_t *message) {
+ isc_result_t result;
+ unsigned char *data;
+ isc_buffer_t buffer;
+ isc_region_t r;
+ isc_region_t *mr;
+
+ REQUIRE(NS_CLIENT_VALID(client));
+
+ CTRACE("sendraw");
+
+ mr = dns_message_getrawmessage(message);
+ if (mr == NULL) {
+ result = ISC_R_UNEXPECTEDEND;
+ goto done;
+ }
+
+ client_allocsendbuf(client, &buffer, &data);
+
+ if (mr->length > isc_buffer_length(&buffer)) {
+ result = ISC_R_NOSPACE;
+ goto done;
+ }
+
+ /*
+ * Copy message to buffer and fixup id.
+ */
+ isc_buffer_availableregion(&buffer, &r);
+ result = isc_buffer_copyregion(&buffer, mr);
+ if (result != ISC_R_SUCCESS) {
+ goto done;
+ }
+ r.base[0] = (client->message->id >> 8) & 0xff;
+ r.base[1] = client->message->id & 0xff;
+
+#ifdef HAVE_DNSTAP
+ if (client->view != NULL) {
+ bool tcp = TCP_CLIENT(client);
+ dns_dtmsgtype_t dtmsgtype;
+ if (client->message->opcode == dns_opcode_update) {
+ dtmsgtype = DNS_DTTYPE_UR;
+ } else if ((client->message->flags & DNS_MESSAGEFLAG_RD) != 0) {
+ dtmsgtype = DNS_DTTYPE_CR;
+ } else {
+ dtmsgtype = DNS_DTTYPE_AR;
+ }
+ dns_dt_send(client->view, dtmsgtype, &client->peeraddr,
+ &client->destsockaddr, tcp, NULL,
+ &client->requesttime, NULL, &buffer);
+ }
+#endif
+
+ client_sendpkg(client, &buffer);
+
+ return;
+done:
+ if (client->tcpbuf != NULL) {
+ isc_mem_put(client->mctx, client->tcpbuf,
+ NS_CLIENT_TCP_BUFFER_SIZE);
+ client->tcpbuf = NULL;
+ }
+
+ ns_client_drop(client, result);
+}
+
+void
+ns_client_send(ns_client_t *client) {
+ isc_result_t result;
+ unsigned char *data;
+ isc_buffer_t buffer = { .magic = 0 };
+ isc_region_t r;
+ dns_compress_t cctx;
+ bool cleanup_cctx = false;
+ unsigned int render_opts;
+ unsigned int preferred_glue;
+ bool opt_included = false;
+ size_t respsize;
+ dns_aclenv_t *env;
+#ifdef HAVE_DNSTAP
+ unsigned char zone[DNS_NAME_MAXWIRE];
+ dns_dtmsgtype_t dtmsgtype;
+ isc_region_t zr;
+#endif /* HAVE_DNSTAP */
+
+ REQUIRE(NS_CLIENT_VALID(client));
+
+ if ((client->query.attributes & NS_QUERYATTR_ANSWERED) != 0) {
+ return;
+ }
+
+ /*
+ * XXXWPK TODO
+ * Delay the response according to the -T delay option
+ */
+
+ env = ns_interfacemgr_getaclenv(client->manager->interface->mgr);
+
+ CTRACE("send");
+
+ if (client->message->opcode == dns_opcode_query &&
+ (client->attributes & NS_CLIENTATTR_RA) != 0)
+ {
+ client->message->flags |= DNS_MESSAGEFLAG_RA;
+ }
+
+ if ((client->attributes & NS_CLIENTATTR_WANTDNSSEC) != 0) {
+ render_opts = 0;
+ } else {
+ render_opts = DNS_MESSAGERENDER_OMITDNSSEC;
+ }
+
+ preferred_glue = 0;
+ if (client->view != NULL) {
+ if (client->view->preferred_glue == dns_rdatatype_a) {
+ preferred_glue = DNS_MESSAGERENDER_PREFER_A;
+ } else if (client->view->preferred_glue == dns_rdatatype_aaaa) {
+ preferred_glue = DNS_MESSAGERENDER_PREFER_AAAA;
+ }
+ }
+ if (preferred_glue == 0) {
+ if (isc_sockaddr_pf(&client->peeraddr) == AF_INET) {
+ preferred_glue = DNS_MESSAGERENDER_PREFER_A;
+ } else {
+ preferred_glue = DNS_MESSAGERENDER_PREFER_AAAA;
+ }
+ }
+
+ /*
+ * Create an OPT for our reply.
+ */
+ if ((client->attributes & NS_CLIENTATTR_WANTOPT) != 0) {
+ result = ns_client_addopt(client, client->message,
+ &client->opt);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+ }
+
+ client_allocsendbuf(client, &buffer, &data);
+
+ result = dns_compress_init(&cctx, -1, client->mctx);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+ if (client->peeraddr_valid && client->view != NULL) {
+ isc_netaddr_t netaddr;
+ dns_name_t *name = NULL;
+
+ isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
+ if (client->message->tsigkey != NULL) {
+ name = &client->message->tsigkey->name;
+ }
+
+ if (client->view->nocasecompress == NULL ||
+ !dns_acl_allowed(&netaddr, name,
+ client->view->nocasecompress, env))
+ {
+ dns_compress_setsensitive(&cctx, true);
+ }
+
+ if (!client->view->msgcompression) {
+ dns_compress_disable(&cctx);
+ }
+ }
+ cleanup_cctx = true;
+
+ result = dns_message_renderbegin(client->message, &cctx, &buffer);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+
+ if (client->opt != NULL) {
+ result = dns_message_setopt(client->message, client->opt);
+ opt_included = true;
+ client->opt = NULL;
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+ }
+ result = dns_message_rendersection(client->message,
+ DNS_SECTION_QUESTION, 0);
+ if (result == ISC_R_NOSPACE) {
+ client->message->flags |= DNS_MESSAGEFLAG_TC;
+ goto renderend;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+ /*
+ * Stop after the question if TC was set for rate limiting.
+ */
+ if ((client->message->flags & DNS_MESSAGEFLAG_TC) != 0) {
+ goto renderend;
+ }
+ result = dns_message_rendersection(client->message, DNS_SECTION_ANSWER,
+ DNS_MESSAGERENDER_PARTIAL |
+ render_opts);
+ if (result == ISC_R_NOSPACE) {
+ client->message->flags |= DNS_MESSAGEFLAG_TC;
+ goto renderend;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+ result = dns_message_rendersection(
+ client->message, DNS_SECTION_AUTHORITY,
+ DNS_MESSAGERENDER_PARTIAL | render_opts);
+ if (result == ISC_R_NOSPACE) {
+ client->message->flags |= DNS_MESSAGEFLAG_TC;
+ goto renderend;
+ }
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+ result = dns_message_rendersection(client->message,
+ DNS_SECTION_ADDITIONAL,
+ preferred_glue | render_opts);
+ if (result != ISC_R_SUCCESS && result != ISC_R_NOSPACE) {
+ goto cleanup;
+ }
+renderend:
+ result = dns_message_renderend(client->message);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+
+#ifdef HAVE_DNSTAP
+ memset(&zr, 0, sizeof(zr));
+ if (((client->message->flags & DNS_MESSAGEFLAG_AA) != 0) &&
+ (client->query.authzone != NULL))
+ {
+ isc_result_t eresult;
+ isc_buffer_t b;
+ dns_name_t *zo = dns_zone_getorigin(client->query.authzone);
+
+ isc_buffer_init(&b, zone, sizeof(zone));
+ dns_compress_setmethods(&cctx, DNS_COMPRESS_NONE);
+ eresult = dns_name_towire(zo, &cctx, &b);
+ if (eresult == ISC_R_SUCCESS) {
+ isc_buffer_usedregion(&b, &zr);
+ }
+ }
+
+ if (client->message->opcode == dns_opcode_update) {
+ dtmsgtype = DNS_DTTYPE_UR;
+ } else if ((client->message->flags & DNS_MESSAGEFLAG_RD) != 0) {
+ dtmsgtype = DNS_DTTYPE_CR;
+ } else {
+ dtmsgtype = DNS_DTTYPE_AR;
+ }
+#endif /* HAVE_DNSTAP */
+
+ if (cleanup_cctx) {
+ dns_compress_invalidate(&cctx);
+ }
+
+ if (client->sendcb != NULL) {
+ client->sendcb(&buffer);
+ } else if (TCP_CLIENT(client)) {
+ isc_buffer_usedregion(&buffer, &r);
+#ifdef HAVE_DNSTAP
+ if (client->view != NULL) {
+ dns_dt_send(client->view, dtmsgtype, &client->peeraddr,
+ &client->destsockaddr, true, &zr,
+ &client->requesttime, NULL, &buffer);
+ }
+#endif /* HAVE_DNSTAP */
+
+ respsize = isc_buffer_usedlength(&buffer);
+
+ client_sendpkg(client, &buffer);
+
+ switch (isc_sockaddr_pf(&client->peeraddr)) {
+ case AF_INET:
+ isc_stats_increment(client->sctx->tcpoutstats4,
+ ISC_MIN((int)respsize / 16, 256));
+ break;
+ case AF_INET6:
+ isc_stats_increment(client->sctx->tcpoutstats6,
+ ISC_MIN((int)respsize / 16, 256));
+ break;
+ default:
+ UNREACHABLE();
+ }
+ } else {
+#ifdef HAVE_DNSTAP
+ /*
+ * Log dnstap data first, because client_sendpkg() may
+ * leave client->view set to NULL.
+ */
+ if (client->view != NULL) {
+ dns_dt_send(client->view, dtmsgtype, &client->peeraddr,
+ &client->destsockaddr, false, &zr,
+ &client->requesttime, NULL, &buffer);
+ }
+#endif /* HAVE_DNSTAP */
+
+ respsize = isc_buffer_usedlength(&buffer);
+
+ client_sendpkg(client, &buffer);
+
+ switch (isc_sockaddr_pf(&client->peeraddr)) {
+ case AF_INET:
+ isc_stats_increment(client->sctx->udpoutstats4,
+ ISC_MIN((int)respsize / 16, 256));
+ break;
+ case AF_INET6:
+ isc_stats_increment(client->sctx->udpoutstats6,
+ ISC_MIN((int)respsize / 16, 256));
+ break;
+ default:
+ UNREACHABLE();
+ }
+ }
+
+ /* update statistics (XXXJT: is it okay to access message->xxxkey?) */
+ ns_stats_increment(client->sctx->nsstats, ns_statscounter_response);
+
+ dns_rcodestats_increment(client->sctx->rcodestats,
+ client->message->rcode);
+ if (opt_included) {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_edns0out);
+ }
+ if (client->message->tsigkey != NULL) {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_tsigout);
+ }
+ if (client->message->sig0key != NULL) {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_sig0out);
+ }
+ if ((client->message->flags & DNS_MESSAGEFLAG_TC) != 0) {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_truncatedresp);
+ }
+
+ client->query.attributes |= NS_QUERYATTR_ANSWERED;
+
+ return;
+
+cleanup:
+ if (client->tcpbuf != NULL) {
+ isc_mem_put(client->mctx, client->tcpbuf,
+ NS_CLIENT_TCP_BUFFER_SIZE);
+ client->tcpbuf = NULL;
+ }
+
+ if (cleanup_cctx) {
+ dns_compress_invalidate(&cctx);
+ }
+}
+
+#if NS_CLIENT_DROPPORT
+#define DROPPORT_NO 0
+#define DROPPORT_REQUEST 1
+#define DROPPORT_RESPONSE 2
+/*%
+ * ns_client_dropport determines if certain requests / responses
+ * should be dropped based on the port number.
+ *
+ * Returns:
+ * \li 0: Don't drop.
+ * \li 1: Drop request.
+ * \li 2: Drop (error) response.
+ */
+static int
+ns_client_dropport(in_port_t port) {
+ switch (port) {
+ case 7: /* echo */
+ case 13: /* daytime */
+ case 19: /* chargen */
+ case 37: /* time */
+ return (DROPPORT_REQUEST);
+ case 464: /* kpasswd */
+ return (DROPPORT_RESPONSE);
+ }
+ return (DROPPORT_NO);
+}
+#endif /* if NS_CLIENT_DROPPORT */
+
+void
+ns_client_error(ns_client_t *client, isc_result_t result) {
+ dns_message_t *message = NULL;
+ dns_rcode_t rcode;
+ bool trunc = false;
+
+ REQUIRE(NS_CLIENT_VALID(client));
+
+ CTRACE("error");
+
+ message = client->message;
+
+ if (client->rcode_override == -1) {
+ rcode = dns_result_torcode(result);
+ } else {
+ rcode = (dns_rcode_t)(client->rcode_override & 0xfff);
+ }
+
+ if (result == ISC_R_MAXSIZE) {
+ trunc = true;
+ }
+
+#if NS_CLIENT_DROPPORT
+ /*
+ * Don't send FORMERR to ports on the drop port list.
+ */
+ if (rcode == dns_rcode_formerr &&
+ ns_client_dropport(isc_sockaddr_getport(&client->peeraddr)) !=
+ DROPPORT_NO)
+ {
+ char buf[64];
+ isc_buffer_t b;
+
+ isc_buffer_init(&b, buf, sizeof(buf) - 1);
+ if (dns_rcode_totext(rcode, &b) != ISC_R_SUCCESS) {
+ isc_buffer_putstr(&b, "UNKNOWN RCODE");
+ }
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(10),
+ "dropped error (%.*s) response: suspicious port",
+ (int)isc_buffer_usedlength(&b), buf);
+ ns_client_drop(client, ISC_R_SUCCESS);
+ return;
+ }
+#endif /* if NS_CLIENT_DROPPORT */
+
+ /*
+ * Try to rate limit error responses.
+ */
+ if (client->view != NULL && client->view->rrl != NULL) {
+ bool wouldlog;
+ char log_buf[DNS_RRL_LOG_BUF_LEN];
+ dns_rrl_result_t rrl_result;
+ int loglevel;
+
+ if ((client->sctx->options & NS_SERVER_LOGQUERIES) != 0) {
+ loglevel = DNS_RRL_LOG_DROP;
+ } else {
+ loglevel = ISC_LOG_DEBUG(1);
+ }
+ wouldlog = isc_log_wouldlog(ns_lctx, loglevel);
+ rrl_result = dns_rrl(client->view, NULL, &client->peeraddr,
+ TCP_CLIENT(client), dns_rdataclass_in,
+ dns_rdatatype_none, NULL, result,
+ client->now, wouldlog, log_buf,
+ sizeof(log_buf));
+ if (rrl_result != DNS_RRL_RESULT_OK) {
+ /*
+ * Log dropped errors in the query category
+ * so that they are not lost in silence.
+ * Starts of rate-limited bursts are logged in
+ * NS_LOGCATEGORY_RRL.
+ */
+ if (wouldlog) {
+ ns_client_log(client,
+ NS_LOGCATEGORY_QUERY_ERRORS,
+ NS_LOGMODULE_CLIENT, loglevel,
+ "%s", log_buf);
+ }
+ /*
+ * Some error responses cannot be 'slipped',
+ * so don't try to slip any error responses.
+ */
+ if (!client->view->rrl->log_only) {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_ratedropped);
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_dropped);
+ ns_client_drop(client, DNS_R_DROP);
+ return;
+ }
+ }
+ }
+
+ /*
+ * Message may be an in-progress reply that we had trouble
+ * with, in which case QR will be set. We need to clear QR before
+ * calling dns_message_reply() to avoid triggering an assertion.
+ */
+ message->flags &= ~DNS_MESSAGEFLAG_QR;
+ /*
+ * AA and AD shouldn't be set.
+ */
+ message->flags &= ~(DNS_MESSAGEFLAG_AA | DNS_MESSAGEFLAG_AD);
+ result = dns_message_reply(message, true);
+ if (result != ISC_R_SUCCESS) {
+ /*
+ * It could be that we've got a query with a good header,
+ * but a bad question section, so we try again with
+ * want_question_section set to false.
+ */
+ result = dns_message_reply(message, false);
+ if (result != ISC_R_SUCCESS) {
+ ns_client_drop(client, result);
+ return;
+ }
+ }
+
+ message->rcode = rcode;
+ if (trunc) {
+ message->flags |= DNS_MESSAGEFLAG_TC;
+ }
+
+ if (rcode == dns_rcode_formerr) {
+ /*
+ * FORMERR loop avoidance: If we sent a FORMERR message
+ * with the same ID to the same client less than two
+ * seconds ago, assume that we are in an infinite error
+ * packet dialog with a server for some protocol whose
+ * error responses look enough like DNS queries to
+ * elicit a FORMERR response. Drop a packet to break
+ * the loop.
+ */
+ if (isc_sockaddr_equal(&client->peeraddr,
+ &client->formerrcache.addr) &&
+ message->id == client->formerrcache.id &&
+ (isc_time_seconds(&client->requesttime) -
+ client->formerrcache.time) < 2)
+ {
+ /* Drop packet. */
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(1),
+ "possible error packet loop, "
+ "FORMERR dropped");
+ ns_client_drop(client, result);
+ return;
+ }
+ client->formerrcache.addr = client->peeraddr;
+ client->formerrcache.time =
+ isc_time_seconds(&client->requesttime);
+ client->formerrcache.id = message->id;
+ } else if (rcode == dns_rcode_servfail && client->query.qname != NULL &&
+ client->view != NULL && client->view->fail_ttl != 0 &&
+ ((client->attributes & NS_CLIENTATTR_NOSETFC) == 0))
+ {
+ /*
+ * SERVFAIL caching: store qname/qtype of failed queries
+ */
+ isc_time_t expire;
+ isc_interval_t i;
+ uint32_t flags = 0;
+
+ if ((message->flags & DNS_MESSAGEFLAG_CD) != 0) {
+ flags = NS_FAILCACHE_CD;
+ }
+
+ isc_interval_set(&i, client->view->fail_ttl, 0);
+ result = isc_time_nowplusinterval(&expire, &i);
+ if (result == ISC_R_SUCCESS) {
+ dns_badcache_add(
+ client->view->failcache, client->query.qname,
+ client->query.qtype, true, flags, &expire);
+ }
+ }
+
+ ns_client_send(client);
+}
+
+isc_result_t
+ns_client_addopt(ns_client_t *client, dns_message_t *message,
+ dns_rdataset_t **opt) {
+ unsigned char ecs[ECS_SIZE];
+ char nsid[_POSIX_HOST_NAME_MAX + 1], *nsidp = NULL;
+ unsigned char cookie[COOKIE_SIZE];
+ isc_result_t result;
+ dns_view_t *view;
+ dns_resolver_t *resolver;
+ uint16_t udpsize;
+ dns_ednsopt_t ednsopts[DNS_EDNSOPTIONS];
+ int count = 0;
+ unsigned int flags;
+ unsigned char expire[4];
+ unsigned char advtimo[2];
+ dns_aclenv_t *env;
+
+ REQUIRE(NS_CLIENT_VALID(client));
+ REQUIRE(opt != NULL && *opt == NULL);
+ REQUIRE(message != NULL);
+
+ env = ns_interfacemgr_getaclenv(client->manager->interface->mgr);
+ view = client->view;
+ resolver = (view != NULL) ? view->resolver : NULL;
+ if (resolver != NULL) {
+ udpsize = dns_resolver_getudpsize(resolver);
+ } else {
+ udpsize = client->sctx->udpsize;
+ }
+
+ flags = client->extflags & DNS_MESSAGEEXTFLAG_REPLYPRESERVE;
+
+ /* Set EDNS options if applicable */
+ if (WANTNSID(client)) {
+ if (client->sctx->server_id != NULL) {
+ nsidp = client->sctx->server_id;
+ } else if (client->sctx->gethostname != NULL) {
+ result = client->sctx->gethostname(nsid, sizeof(nsid));
+ if (result != ISC_R_SUCCESS) {
+ goto no_nsid;
+ }
+ nsidp = nsid;
+ } else {
+ goto no_nsid;
+ }
+
+ INSIST(count < DNS_EDNSOPTIONS);
+ ednsopts[count].code = DNS_OPT_NSID;
+ ednsopts[count].length = (uint16_t)strlen(nsidp);
+ ednsopts[count].value = (unsigned char *)nsidp;
+ count++;
+ }
+no_nsid:
+ if ((client->attributes & NS_CLIENTATTR_WANTCOOKIE) != 0) {
+ isc_buffer_t buf;
+ isc_stdtime_t now;
+ uint32_t nonce;
+
+ isc_buffer_init(&buf, cookie, sizeof(cookie));
+ isc_stdtime_get(&now);
+
+ isc_random_buf(&nonce, sizeof(nonce));
+
+ compute_cookie(client, now, nonce, client->sctx->secret, &buf);
+
+ INSIST(count < DNS_EDNSOPTIONS);
+ ednsopts[count].code = DNS_OPT_COOKIE;
+ ednsopts[count].length = COOKIE_SIZE;
+ ednsopts[count].value = cookie;
+ count++;
+ }
+ if ((client->attributes & NS_CLIENTATTR_HAVEEXPIRE) != 0) {
+ isc_buffer_t buf;
+
+ INSIST(count < DNS_EDNSOPTIONS);
+
+ isc_buffer_init(&buf, expire, sizeof(expire));
+ isc_buffer_putuint32(&buf, client->expire);
+ ednsopts[count].code = DNS_OPT_EXPIRE;
+ ednsopts[count].length = 4;
+ ednsopts[count].value = expire;
+ count++;
+ }
+ if (((client->attributes & NS_CLIENTATTR_HAVEECS) != 0) &&
+ (client->ecs.addr.family == AF_INET ||
+ client->ecs.addr.family == AF_INET6 ||
+ client->ecs.addr.family == AF_UNSPEC))
+ {
+ isc_buffer_t buf;
+ uint8_t addr[16];
+ uint32_t plen, addrl;
+ uint16_t family = 0;
+
+ /* Add CLIENT-SUBNET option. */
+
+ plen = client->ecs.source;
+
+ /* Round up prefix len to a multiple of 8 */
+ addrl = (plen + 7) / 8;
+
+ switch (client->ecs.addr.family) {
+ case AF_UNSPEC:
+ INSIST(plen == 0);
+ family = 0;
+ break;
+ case AF_INET:
+ INSIST(plen <= 32);
+ family = 1;
+ memmove(addr, &client->ecs.addr.type, addrl);
+ break;
+ case AF_INET6:
+ INSIST(plen <= 128);
+ family = 2;
+ memmove(addr, &client->ecs.addr.type, addrl);
+ break;
+ default:
+ UNREACHABLE();
+ }
+
+ isc_buffer_init(&buf, ecs, sizeof(ecs));
+ /* family */
+ isc_buffer_putuint16(&buf, family);
+ /* source prefix-length */
+ isc_buffer_putuint8(&buf, client->ecs.source);
+ /* scope prefix-length */
+ isc_buffer_putuint8(&buf, client->ecs.scope);
+
+ /* address */
+ if (addrl > 0) {
+ /* Mask off last address byte */
+ if ((plen % 8) != 0) {
+ addr[addrl - 1] &= ~0U << (8 - (plen % 8));
+ }
+ isc_buffer_putmem(&buf, addr, (unsigned)addrl);
+ }
+
+ ednsopts[count].code = DNS_OPT_CLIENT_SUBNET;
+ ednsopts[count].length = addrl + 4;
+ ednsopts[count].value = ecs;
+ count++;
+ }
+ if (TCP_CLIENT(client) && USEKEEPALIVE(client)) {
+ isc_buffer_t buf;
+ uint32_t adv;
+
+ INSIST(count < DNS_EDNSOPTIONS);
+
+ isc_nm_gettimeouts(isc_nmhandle_netmgr(client->handle), NULL,
+ NULL, NULL, &adv);
+ adv /= 100; /* units of 100 milliseconds */
+ isc_buffer_init(&buf, advtimo, sizeof(advtimo));
+ isc_buffer_putuint16(&buf, (uint16_t)adv);
+ ednsopts[count].code = DNS_OPT_TCP_KEEPALIVE;
+ ednsopts[count].length = 2;
+ ednsopts[count].value = advtimo;
+ count++;
+ }
+
+ /* Padding must be added last */
+ if ((view != NULL) && (view->padding > 0) && WANTPAD(client) &&
+ (TCP_CLIENT(client) ||
+ ((client->attributes & NS_CLIENTATTR_HAVECOOKIE) != 0)))
+ {
+ isc_netaddr_t netaddr;
+ int match;
+
+ isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
+ result = dns_acl_match(&netaddr, NULL, view->pad_acl, env,
+ &match, NULL);
+ if (result == ISC_R_SUCCESS && match > 0) {
+ INSIST(count < DNS_EDNSOPTIONS);
+
+ ednsopts[count].code = DNS_OPT_PAD;
+ ednsopts[count].length = 0;
+ ednsopts[count].value = NULL;
+ count++;
+
+ dns_message_setpadding(message, view->padding);
+ }
+ }
+
+ result = dns_message_buildopt(message, opt, 0, udpsize, flags, ednsopts,
+ count);
+ return (result);
+}
+
+static void
+compute_cookie(ns_client_t *client, uint32_t when, uint32_t nonce,
+ const unsigned char *secret, isc_buffer_t *buf) {
+ unsigned char digest[ISC_MAX_MD_SIZE] ISC_NONSTRING = { 0 };
+ STATIC_ASSERT(ISC_MAX_MD_SIZE >= ISC_SIPHASH24_TAG_LENGTH, "You need "
+ "to "
+ "increase "
+ "the digest "
+ "buffer.");
+ STATIC_ASSERT(ISC_MAX_MD_SIZE >= ISC_AES_BLOCK_LENGTH, "You need to "
+ "increase the "
+ "digest "
+ "buffer.");
+
+ switch (client->sctx->cookiealg) {
+ case ns_cookiealg_siphash24: {
+ unsigned char input[16 + 16] ISC_NONSTRING = { 0 };
+ size_t inputlen = 0;
+ isc_netaddr_t netaddr;
+ unsigned char *cp;
+
+ cp = isc_buffer_used(buf);
+ isc_buffer_putmem(buf, client->cookie, 8);
+ isc_buffer_putuint8(buf, NS_COOKIE_VERSION_1);
+ isc_buffer_putuint24(buf, 0); /* Reserved */
+ isc_buffer_putuint32(buf, when);
+
+ memmove(input, cp, 16);
+
+ isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
+ switch (netaddr.family) {
+ case AF_INET:
+ cp = (unsigned char *)&netaddr.type.in;
+ memmove(input + 16, cp, 4);
+ inputlen = 20;
+ break;
+ case AF_INET6:
+ cp = (unsigned char *)&netaddr.type.in6;
+ memmove(input + 16, cp, 16);
+ inputlen = 32;
+ break;
+ default:
+ UNREACHABLE();
+ }
+
+ isc_siphash24(secret, input, inputlen, digest);
+ isc_buffer_putmem(buf, digest, 8);
+ break;
+ }
+ case ns_cookiealg_aes: {
+ unsigned char input[4 + 4 + 16] ISC_NONSTRING = { 0 };
+ isc_netaddr_t netaddr;
+ unsigned char *cp;
+ unsigned int i;
+
+ cp = isc_buffer_used(buf);
+ isc_buffer_putmem(buf, client->cookie, 8);
+ isc_buffer_putuint32(buf, nonce);
+ isc_buffer_putuint32(buf, when);
+ memmove(input, cp, 16);
+ isc_aes128_crypt(secret, input, digest);
+ for (i = 0; i < 8; i++) {
+ input[i] = digest[i] ^ digest[i + 8];
+ }
+ isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
+ switch (netaddr.family) {
+ case AF_INET:
+ cp = (unsigned char *)&netaddr.type.in;
+ memmove(input + 8, cp, 4);
+ memset(input + 12, 0, 4);
+ isc_aes128_crypt(secret, input, digest);
+ break;
+ case AF_INET6:
+ cp = (unsigned char *)&netaddr.type.in6;
+ memmove(input + 8, cp, 16);
+ isc_aes128_crypt(secret, input, digest);
+ for (i = 0; i < 8; i++) {
+ input[i + 8] = digest[i] ^ digest[i + 8];
+ }
+ isc_aes128_crypt(client->sctx->secret, input + 8,
+ digest);
+ break;
+ default:
+ UNREACHABLE();
+ }
+ for (i = 0; i < 8; i++) {
+ digest[i] ^= digest[i + 8];
+ }
+ isc_buffer_putmem(buf, digest, 8);
+ break;
+ }
+
+ default:
+ UNREACHABLE();
+ }
+}
+
+static void
+process_cookie(ns_client_t *client, isc_buffer_t *buf, size_t optlen) {
+ ns_altsecret_t *altsecret;
+ unsigned char dbuf[COOKIE_SIZE];
+ unsigned char *old;
+ isc_stdtime_t now;
+ uint32_t when;
+ uint32_t nonce;
+ isc_buffer_t db;
+
+ /*
+ * If we have already seen a cookie option skip this cookie option.
+ */
+ if ((!client->sctx->answercookie) ||
+ (client->attributes & NS_CLIENTATTR_WANTCOOKIE) != 0)
+ {
+ isc_buffer_forward(buf, (unsigned int)optlen);
+ return;
+ }
+
+ client->attributes |= NS_CLIENTATTR_WANTCOOKIE;
+
+ ns_stats_increment(client->sctx->nsstats, ns_statscounter_cookiein);
+
+ if (optlen != COOKIE_SIZE) {
+ /*
+ * Not our token.
+ */
+ INSIST(optlen >= 8U);
+ memmove(client->cookie, isc_buffer_current(buf), 8);
+ isc_buffer_forward(buf, (unsigned int)optlen);
+
+ if (optlen == 8U) {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_cookienew);
+ } else {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_cookiebadsize);
+ }
+ return;
+ }
+
+ /*
+ * Process all of the incoming buffer.
+ */
+ old = isc_buffer_current(buf);
+ memmove(client->cookie, old, 8);
+ isc_buffer_forward(buf, 8);
+ nonce = isc_buffer_getuint32(buf);
+ when = isc_buffer_getuint32(buf);
+ isc_buffer_forward(buf, 8);
+
+ /*
+ * Allow for a 5 minute clock skew between servers sharing a secret.
+ * Only accept COOKIE if we have talked to the client in the last hour.
+ */
+ isc_stdtime_get(&now);
+ if (isc_serial_gt(when, (now + 300)) || /* In the future. */
+ isc_serial_lt(when, (now - 3600)))
+ { /* In the past. */
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_cookiebadtime);
+ return;
+ }
+
+ isc_buffer_init(&db, dbuf, sizeof(dbuf));
+ compute_cookie(client, when, nonce, client->sctx->secret, &db);
+
+ if (isc_safe_memequal(old, dbuf, COOKIE_SIZE)) {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_cookiematch);
+ client->attributes |= NS_CLIENTATTR_HAVECOOKIE;
+ return;
+ }
+
+ for (altsecret = ISC_LIST_HEAD(client->sctx->altsecrets);
+ altsecret != NULL; altsecret = ISC_LIST_NEXT(altsecret, link))
+ {
+ isc_buffer_init(&db, dbuf, sizeof(dbuf));
+ compute_cookie(client, when, nonce, altsecret->secret, &db);
+ if (isc_safe_memequal(old, dbuf, COOKIE_SIZE)) {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_cookiematch);
+ client->attributes |= NS_CLIENTATTR_HAVECOOKIE;
+ return;
+ }
+ }
+
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_cookienomatch);
+}
+
+static isc_result_t
+process_ecs(ns_client_t *client, isc_buffer_t *buf, size_t optlen) {
+ uint16_t family;
+ uint8_t addrlen, addrbytes, scope, *paddr;
+ isc_netaddr_t caddr;
+
+ /*
+ * If we have already seen a ECS option skip this ECS option.
+ */
+ if ((client->attributes & NS_CLIENTATTR_HAVEECS) != 0) {
+ isc_buffer_forward(buf, (unsigned int)optlen);
+ return (ISC_R_SUCCESS);
+ }
+
+ /*
+ * XXXMUKS: Is there any need to repeat these checks here
+ * (except query's scope length) when they are done in the OPT
+ * RDATA fromwire code?
+ */
+
+ if (optlen < 4U) {
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(2),
+ "EDNS client-subnet option too short");
+ return (DNS_R_FORMERR);
+ }
+
+ family = isc_buffer_getuint16(buf);
+ addrlen = isc_buffer_getuint8(buf);
+ scope = isc_buffer_getuint8(buf);
+ optlen -= 4;
+
+ if (scope != 0U) {
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(2),
+ "EDNS client-subnet option: invalid scope");
+ return (DNS_R_OPTERR);
+ }
+
+ memset(&caddr, 0, sizeof(caddr));
+ switch (family) {
+ case 0:
+ /*
+ * XXXMUKS: In queries, if FAMILY is set to 0, SOURCE
+ * PREFIX-LENGTH must be 0 and ADDRESS should not be
+ * present as the address and prefix lengths don't make
+ * sense because the family is unknown.
+ */
+ if (addrlen != 0U) {
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(2),
+ "EDNS client-subnet option: invalid "
+ "address length (%u) for FAMILY=0",
+ addrlen);
+ return (DNS_R_OPTERR);
+ }
+ caddr.family = AF_UNSPEC;
+ break;
+ case 1:
+ if (addrlen > 32U) {
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(2),
+ "EDNS client-subnet option: invalid "
+ "address length (%u) for IPv4",
+ addrlen);
+ return (DNS_R_OPTERR);
+ }
+ caddr.family = AF_INET;
+ break;
+ case 2:
+ if (addrlen > 128U) {
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(2),
+ "EDNS client-subnet option: invalid "
+ "address length (%u) for IPv6",
+ addrlen);
+ return (DNS_R_OPTERR);
+ }
+ caddr.family = AF_INET6;
+ break;
+ default:
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(2),
+ "EDNS client-subnet option: invalid family");
+ return (DNS_R_OPTERR);
+ }
+
+ addrbytes = (addrlen + 7) / 8;
+ if (isc_buffer_remaininglength(buf) < addrbytes) {
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(2),
+ "EDNS client-subnet option: address too short");
+ return (DNS_R_OPTERR);
+ }
+
+ paddr = (uint8_t *)&caddr.type;
+ if (addrbytes != 0U) {
+ memmove(paddr, isc_buffer_current(buf), addrbytes);
+ isc_buffer_forward(buf, addrbytes);
+ optlen -= addrbytes;
+
+ if ((addrlen % 8) != 0) {
+ uint8_t bits = ~0U << (8 - (addrlen % 8));
+ bits &= paddr[addrbytes - 1];
+ if (bits != paddr[addrbytes - 1]) {
+ return (DNS_R_OPTERR);
+ }
+ }
+ }
+
+ memmove(&client->ecs.addr, &caddr, sizeof(caddr));
+ client->ecs.source = addrlen;
+ client->ecs.scope = 0;
+ client->attributes |= NS_CLIENTATTR_HAVEECS;
+
+ isc_buffer_forward(buf, (unsigned int)optlen);
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+process_keytag(ns_client_t *client, isc_buffer_t *buf, size_t optlen) {
+ if (optlen == 0 || (optlen % 2) != 0) {
+ isc_buffer_forward(buf, (unsigned int)optlen);
+ return (DNS_R_OPTERR);
+ }
+
+ /* Silently drop additional keytag options. */
+ if (client->keytag != NULL) {
+ isc_buffer_forward(buf, (unsigned int)optlen);
+ return (ISC_R_SUCCESS);
+ }
+
+ client->keytag = isc_mem_get(client->mctx, optlen);
+ {
+ client->keytag_len = (uint16_t)optlen;
+ memmove(client->keytag, isc_buffer_current(buf), optlen);
+ }
+ isc_buffer_forward(buf, (unsigned int)optlen);
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+process_opt(ns_client_t *client, dns_rdataset_t *opt) {
+ dns_rdata_t rdata;
+ isc_buffer_t optbuf;
+ isc_result_t result;
+ uint16_t optcode;
+ uint16_t optlen;
+
+ /*
+ * Set the client's UDP buffer size.
+ */
+ client->udpsize = opt->rdclass;
+
+ /*
+ * If the requested UDP buffer size is less than 512,
+ * ignore it and use 512.
+ */
+ if (client->udpsize < 512) {
+ client->udpsize = 512;
+ }
+
+ /*
+ * Get the flags out of the OPT record.
+ */
+ client->extflags = (uint16_t)(opt->ttl & 0xFFFF);
+
+ /*
+ * Do we understand this version of EDNS?
+ *
+ * XXXRTH need library support for this!
+ */
+ client->ednsversion = (opt->ttl & 0x00FF0000) >> 16;
+ if (client->ednsversion > DNS_EDNS_VERSION) {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_badednsver);
+ result = ns_client_addopt(client, client->message,
+ &client->opt);
+ if (result == ISC_R_SUCCESS) {
+ result = DNS_R_BADVERS;
+ }
+ ns_client_error(client, result);
+ return (result);
+ }
+
+ /* Check for NSID request */
+ result = dns_rdataset_first(opt);
+ if (result == ISC_R_SUCCESS) {
+ dns_rdata_init(&rdata);
+ dns_rdataset_current(opt, &rdata);
+ isc_buffer_init(&optbuf, rdata.data, rdata.length);
+ isc_buffer_add(&optbuf, rdata.length);
+ while (isc_buffer_remaininglength(&optbuf) >= 4) {
+ optcode = isc_buffer_getuint16(&optbuf);
+ optlen = isc_buffer_getuint16(&optbuf);
+ switch (optcode) {
+ case DNS_OPT_NSID:
+ if (!WANTNSID(client)) {
+ ns_stats_increment(
+ client->sctx->nsstats,
+ ns_statscounter_nsidopt);
+ }
+ client->attributes |= NS_CLIENTATTR_WANTNSID;
+ isc_buffer_forward(&optbuf, optlen);
+ break;
+ case DNS_OPT_COOKIE:
+ process_cookie(client, &optbuf, optlen);
+ break;
+ case DNS_OPT_EXPIRE:
+ if (!WANTEXPIRE(client)) {
+ ns_stats_increment(
+ client->sctx->nsstats,
+ ns_statscounter_expireopt);
+ }
+ client->attributes |= NS_CLIENTATTR_WANTEXPIRE;
+ isc_buffer_forward(&optbuf, optlen);
+ break;
+ case DNS_OPT_CLIENT_SUBNET:
+ result = process_ecs(client, &optbuf, optlen);
+ if (result != ISC_R_SUCCESS) {
+ ns_client_error(client, result);
+ return (result);
+ }
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_ecsopt);
+ break;
+ case DNS_OPT_TCP_KEEPALIVE:
+ if (!USEKEEPALIVE(client)) {
+ ns_stats_increment(
+ client->sctx->nsstats,
+ ns_statscounter_keepaliveopt);
+ }
+ client->attributes |=
+ NS_CLIENTATTR_USEKEEPALIVE;
+ isc_nmhandle_keepalive(client->handle, true);
+ isc_buffer_forward(&optbuf, optlen);
+ break;
+ case DNS_OPT_PAD:
+ client->attributes |= NS_CLIENTATTR_WANTPAD;
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_padopt);
+ isc_buffer_forward(&optbuf, optlen);
+ break;
+ case DNS_OPT_KEY_TAG:
+ result = process_keytag(client, &optbuf,
+ optlen);
+ if (result != ISC_R_SUCCESS) {
+ ns_client_error(client, result);
+ return (result);
+ }
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_keytagopt);
+ break;
+ default:
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_otheropt);
+ isc_buffer_forward(&optbuf, optlen);
+ break;
+ }
+ }
+ }
+
+ ns_stats_increment(client->sctx->nsstats, ns_statscounter_edns0in);
+ client->attributes |= NS_CLIENTATTR_WANTOPT;
+
+ return (result);
+}
+
+void
+ns__client_reset_cb(void *client0) {
+ ns_client_t *client = client0;
+
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY, NS_LOGMODULE_CLIENT,
+ ISC_LOG_DEBUG(3), "reset client");
+
+ /*
+ * We never started processing this client, possible if we're
+ * shutting down, just exit.
+ */
+ if (client->state == NS_CLIENTSTATE_READY) {
+ return;
+ }
+
+ ns_client_endrequest(client);
+ if (client->tcpbuf != NULL) {
+ isc_mem_put(client->mctx, client->tcpbuf,
+ NS_CLIENT_TCP_BUFFER_SIZE);
+ }
+
+ if (client->keytag != NULL) {
+ isc_mem_put(client->mctx, client->keytag, client->keytag_len);
+ client->keytag_len = 0;
+ }
+
+ client->state = NS_CLIENTSTATE_READY;
+ INSIST(client->recursionquota == NULL);
+}
+
+void
+ns__client_put_cb(void *client0) {
+ ns_client_t *client = client0;
+
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY, NS_LOGMODULE_CLIENT,
+ ISC_LOG_DEBUG(3), "freeing client");
+
+ /*
+ * Call this first because it requires a valid client.
+ */
+ ns_query_free(client);
+
+ client->magic = 0;
+ client->shuttingdown = true;
+
+ if (client->manager != NULL) {
+ clientmgr_detach(&client->manager);
+ }
+
+ isc_mem_put(client->mctx, client->sendbuf, NS_CLIENT_SEND_BUFFER_SIZE);
+ if (client->opt != NULL) {
+ INSIST(dns_rdataset_isassociated(client->opt));
+ dns_rdataset_disassociate(client->opt);
+ dns_message_puttemprdataset(client->message, &client->opt);
+ }
+
+ dns_message_detach(&client->message);
+
+ /*
+ * Detaching the task must be done after unlinking from
+ * the manager's lists because the manager accesses
+ * client->task.
+ */
+ if (client->task != NULL) {
+ isc_task_detach(&client->task);
+ }
+
+ /*
+ * Destroy the fetchlock mutex that was created in
+ * ns_query_init().
+ */
+ isc_mutex_destroy(&client->query.fetchlock);
+
+ if (client->sctx != NULL) {
+ ns_server_detach(&client->sctx);
+ }
+
+ if (client->mctx != NULL) {
+ isc_mem_detach(&client->mctx);
+ }
+}
+
+/*
+ * Handle an incoming request event from the socket (UDP case)
+ * or tcpmsg (TCP case).
+ */
+void
+ns__client_request(isc_nmhandle_t *handle, isc_result_t eresult,
+ isc_region_t *region, void *arg) {
+ ns_client_t *client = NULL;
+ isc_result_t result;
+ isc_result_t sigresult = ISC_R_SUCCESS;
+ isc_buffer_t *buffer = NULL;
+ isc_buffer_t tbuffer;
+ dns_rdataset_t *opt = NULL;
+ const dns_name_t *signame = NULL;
+ bool ra; /* Recursion available. */
+ isc_netaddr_t netaddr;
+ int match;
+ dns_messageid_t id;
+ unsigned int flags;
+ bool notimp;
+ size_t reqsize;
+ dns_aclenv_t *env = NULL;
+#ifdef HAVE_DNSTAP
+ dns_dtmsgtype_t dtmsgtype;
+#endif /* ifdef HAVE_DNSTAP */
+
+ if (eresult != ISC_R_SUCCESS) {
+ return;
+ }
+
+ client = isc_nmhandle_getdata(handle);
+ if (client == NULL) {
+ ns_interface_t *ifp = (ns_interface_t *)arg;
+
+ INSIST(VALID_MANAGER(ifp->clientmgr));
+
+ client = isc_nmhandle_getextra(handle);
+
+ result = ns__client_setup(client, ifp->clientmgr, true);
+ if (result != ISC_R_SUCCESS) {
+ return;
+ }
+
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(3),
+ "allocate new client");
+ } else {
+ result = ns__client_setup(client, NULL, false);
+ if (result != ISC_R_SUCCESS) {
+ return;
+ }
+ }
+
+ client->state = NS_CLIENTSTATE_READY;
+
+ isc_task_pause(client->task);
+ if (client->handle == NULL) {
+ isc_nmhandle_setdata(handle, client, ns__client_reset_cb,
+ ns__client_put_cb);
+ client->handle = handle;
+ }
+
+ if (isc_nmhandle_is_stream(handle)) {
+ client->attributes |= NS_CLIENTATTR_TCP;
+ }
+
+ INSIST(client->recursionquota == NULL);
+
+ INSIST(client->state == NS_CLIENTSTATE_READY);
+
+ (void)atomic_fetch_add_relaxed(&ns_client_requests, 1);
+
+ isc_buffer_init(&tbuffer, region->base, region->length);
+ isc_buffer_add(&tbuffer, region->length);
+ buffer = &tbuffer;
+
+ client->peeraddr = isc_nmhandle_peeraddr(handle);
+ client->peeraddr_valid = true;
+
+ reqsize = isc_buffer_usedlength(buffer);
+
+ client->state = NS_CLIENTSTATE_WORKING;
+
+ TIME_NOW(&client->requesttime);
+ client->tnow = client->requesttime;
+ client->now = isc_time_seconds(&client->tnow);
+
+ isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
+
+#if NS_CLIENT_DROPPORT
+ if (ns_client_dropport(isc_sockaddr_getport(&client->peeraddr)) ==
+ DROPPORT_REQUEST)
+ {
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(10),
+ "dropped request: suspicious port");
+ isc_task_unpause(client->task);
+ return;
+ }
+#endif /* if NS_CLIENT_DROPPORT */
+
+ env = ns_interfacemgr_getaclenv(client->manager->interface->mgr);
+ if (client->sctx->blackholeacl != NULL &&
+ (dns_acl_match(&netaddr, NULL, client->sctx->blackholeacl, env,
+ &match, NULL) == ISC_R_SUCCESS) &&
+ match > 0)
+ {
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(10),
+ "dropped request: blackholed peer");
+ isc_task_unpause(client->task);
+ return;
+ }
+
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT, NS_LOGMODULE_CLIENT,
+ ISC_LOG_DEBUG(3), "%s request",
+ TCP_CLIENT(client) ? "TCP" : "UDP");
+
+ result = dns_message_peekheader(buffer, &id, &flags);
+ if (result != ISC_R_SUCCESS) {
+ /*
+ * There isn't enough header to determine whether
+ * this was a request or a response. Drop it.
+ */
+ isc_task_unpause(client->task);
+ return;
+ }
+
+ /*
+ * The client object handles requests, not responses.
+ * If this is a UDP response, forward it to the dispatcher.
+ * If it's a TCP response, discard it here.
+ */
+ if ((flags & DNS_MESSAGEFLAG_QR) != 0) {
+ CTRACE("unexpected response");
+ isc_task_unpause(client->task);
+ return;
+ }
+
+ /*
+ * Update some statistics counters. Don't count responses.
+ */
+ if (isc_sockaddr_pf(&client->peeraddr) == PF_INET) {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_requestv4);
+ } else {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_requestv6);
+ }
+ if (TCP_CLIENT(client)) {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_requesttcp);
+ switch (isc_sockaddr_pf(&client->peeraddr)) {
+ case AF_INET:
+ isc_stats_increment(client->sctx->tcpinstats4,
+ ISC_MIN((int)reqsize / 16, 18));
+ break;
+ case AF_INET6:
+ isc_stats_increment(client->sctx->tcpinstats6,
+ ISC_MIN((int)reqsize / 16, 18));
+ break;
+ default:
+ UNREACHABLE();
+ }
+ } else {
+ switch (isc_sockaddr_pf(&client->peeraddr)) {
+ case AF_INET:
+ isc_stats_increment(client->sctx->udpinstats4,
+ ISC_MIN((int)reqsize / 16, 18));
+ break;
+ case AF_INET6:
+ isc_stats_increment(client->sctx->udpinstats6,
+ ISC_MIN((int)reqsize / 16, 18));
+ break;
+ default:
+ UNREACHABLE();
+ }
+ }
+
+ /*
+ * It's a request. Parse it.
+ */
+ result = dns_message_parse(client->message, buffer, 0);
+ if (result != ISC_R_SUCCESS) {
+ /*
+ * Parsing the request failed. Send a response
+ * (typically FORMERR or SERVFAIL).
+ */
+ if (result == DNS_R_OPTERR) {
+ (void)ns_client_addopt(client, client->message,
+ &client->opt);
+ }
+
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(1),
+ "message parsing failed: %s",
+ isc_result_totext(result));
+ if (result == ISC_R_NOSPACE || result == DNS_R_BADTSIG) {
+ result = DNS_R_FORMERR;
+ }
+ ns_client_error(client, result);
+ isc_task_unpause(client->task);
+ return;
+ }
+
+ /*
+ * Disable pipelined TCP query processing if necessary.
+ */
+ if (TCP_CLIENT(client) &&
+ (client->message->opcode != dns_opcode_query ||
+ (client->sctx->keepresporder != NULL &&
+ dns_acl_allowed(&netaddr, NULL, client->sctx->keepresporder,
+ env))))
+ {
+ isc_nm_tcpdns_sequential(handle);
+ }
+
+ dns_opcodestats_increment(client->sctx->opcodestats,
+ client->message->opcode);
+ switch (client->message->opcode) {
+ case dns_opcode_query:
+ case dns_opcode_update:
+ case dns_opcode_notify:
+ notimp = false;
+ break;
+ case dns_opcode_iquery:
+ default:
+ notimp = true;
+ break;
+ }
+
+ client->message->rcode = dns_rcode_noerror;
+
+ /*
+ * Deal with EDNS.
+ */
+ if ((client->sctx->options & NS_SERVER_NOEDNS) != 0) {
+ opt = NULL;
+ } else {
+ opt = dns_message_getopt(client->message);
+ }
+
+ client->ecs.source = 0;
+ client->ecs.scope = 0;
+
+ if (opt != NULL) {
+ /*
+ * Are returning FORMERR to all EDNS queries?
+ * Simulate a STD13 compliant server.
+ */
+ if ((client->sctx->options & NS_SERVER_EDNSFORMERR) != 0) {
+ ns_client_error(client, DNS_R_FORMERR);
+ isc_task_unpause(client->task);
+ return;
+ }
+
+ /*
+ * Are returning NOTIMP to all EDNS queries?
+ */
+ if ((client->sctx->options & NS_SERVER_EDNSNOTIMP) != 0) {
+ ns_client_error(client, DNS_R_NOTIMP);
+ isc_task_unpause(client->task);
+ return;
+ }
+
+ /*
+ * Are returning REFUSED to all EDNS queries?
+ */
+ if ((client->sctx->options & NS_SERVER_EDNSREFUSED) != 0) {
+ ns_client_error(client, DNS_R_REFUSED);
+ isc_task_unpause(client->task);
+ return;
+ }
+
+ /*
+ * Are we dropping all EDNS queries?
+ */
+ if ((client->sctx->options & NS_SERVER_DROPEDNS) != 0) {
+ ns_client_drop(client, ISC_R_SUCCESS);
+ isc_task_unpause(client->task);
+ return;
+ }
+
+ result = process_opt(client, opt);
+ if (result != ISC_R_SUCCESS) {
+ isc_task_unpause(client->task);
+ return;
+ }
+ }
+
+ if (client->message->rdclass == 0) {
+ if ((client->attributes & NS_CLIENTATTR_WANTCOOKIE) != 0 &&
+ client->message->opcode == dns_opcode_query &&
+ client->message->counts[DNS_SECTION_QUESTION] == 0U)
+ {
+ result = dns_message_reply(client->message, true);
+ if (result != ISC_R_SUCCESS) {
+ ns_client_error(client, result);
+ isc_task_unpause(client->task);
+ return;
+ }
+
+ if (notimp) {
+ client->message->rcode = dns_rcode_notimp;
+ }
+
+ ns_client_send(client);
+ isc_task_unpause(client->task);
+ return;
+ }
+
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(1),
+ "message class could not be determined");
+ ns_client_dumpmessage(client, "message class could not be "
+ "determined");
+ ns_client_error(client, notimp ? DNS_R_NOTIMP : DNS_R_FORMERR);
+ isc_task_unpause(client->task);
+ return;
+ }
+
+ if ((client->manager->interface->flags & NS_INTERFACEFLAG_ANYADDR) == 0)
+ {
+ client->destsockaddr = client->manager->interface->addr;
+ } else {
+ client->destsockaddr = isc_nmhandle_localaddr(handle);
+ }
+ isc_netaddr_fromsockaddr(&client->destaddr, &client->destsockaddr);
+
+ result = client->sctx->matchingview(&netaddr, &client->destaddr,
+ client->message, env, &sigresult,
+ &client->view);
+ if (result != ISC_R_SUCCESS) {
+ char classname[DNS_RDATACLASS_FORMATSIZE];
+
+ /*
+ * Do a dummy TSIG verification attempt so that the
+ * response will have a TSIG if the query did, as
+ * required by RFC2845.
+ */
+ isc_buffer_t b;
+ isc_region_t *r;
+
+ dns_message_resetsig(client->message);
+
+ r = dns_message_getrawmessage(client->message);
+ isc_buffer_init(&b, r->base, r->length);
+ isc_buffer_add(&b, r->length);
+ (void)dns_tsig_verify(&b, client->message, NULL, NULL);
+
+ dns_rdataclass_format(client->message->rdclass, classname,
+ sizeof(classname));
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(1),
+ "no matching view in class '%s'", classname);
+ ns_client_dumpmessage(client, "no matching view in class");
+ ns_client_error(client, notimp ? DNS_R_NOTIMP : DNS_R_REFUSED);
+ isc_task_unpause(client->task);
+ return;
+ }
+
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT, NS_LOGMODULE_CLIENT,
+ ISC_LOG_DEBUG(5), "using view '%s'", client->view->name);
+
+ /*
+ * Check for a signature. We log bad signatures regardless of
+ * whether they ultimately cause the request to be rejected or
+ * not. We do not log the lack of a signature unless we are
+ * debugging.
+ */
+ client->signer = NULL;
+ dns_name_init(&client->signername, NULL);
+ result = dns_message_signer(client->message, &client->signername);
+ if (result != ISC_R_NOTFOUND) {
+ signame = NULL;
+ if (dns_message_gettsig(client->message, &signame) != NULL) {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_tsigin);
+ } else {
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_sig0in);
+ }
+ }
+ if (result == ISC_R_SUCCESS) {
+ char namebuf[DNS_NAME_FORMATSIZE];
+ dns_name_format(&client->signername, namebuf, sizeof(namebuf));
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(3),
+ "request has valid signature: %s", namebuf);
+ client->signer = &client->signername;
+ } else if (result == ISC_R_NOTFOUND) {
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(3),
+ "request is not signed");
+ } else if (result == DNS_R_NOIDENTITY) {
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(3),
+ "request is signed by a nonauthoritative key");
+ } else {
+ char tsigrcode[64];
+ isc_buffer_t b;
+ dns_rcode_t status;
+ isc_result_t tresult;
+
+ /* There is a signature, but it is bad. */
+ ns_stats_increment(client->sctx->nsstats,
+ ns_statscounter_invalidsig);
+ signame = NULL;
+ if (dns_message_gettsig(client->message, &signame) != NULL) {
+ char namebuf[DNS_NAME_FORMATSIZE];
+ char cnamebuf[DNS_NAME_FORMATSIZE];
+ dns_name_format(signame, namebuf, sizeof(namebuf));
+ status = client->message->tsigstatus;
+ isc_buffer_init(&b, tsigrcode, sizeof(tsigrcode) - 1);
+ tresult = dns_tsigrcode_totext(status, &b);
+ INSIST(tresult == ISC_R_SUCCESS);
+ tsigrcode[isc_buffer_usedlength(&b)] = '\0';
+ if (client->message->tsigkey->generated) {
+ dns_name_format(
+ client->message->tsigkey->creator,
+ cnamebuf, sizeof(cnamebuf));
+ ns_client_log(
+ client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, ISC_LOG_ERROR,
+ "request has invalid signature: "
+ "TSIG %s (%s): %s (%s)",
+ namebuf, cnamebuf,
+ isc_result_totext(result), tsigrcode);
+ } else {
+ ns_client_log(
+ client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, ISC_LOG_ERROR,
+ "request has invalid signature: "
+ "TSIG %s: %s (%s)",
+ namebuf, isc_result_totext(result),
+ tsigrcode);
+ }
+ } else {
+ status = client->message->sig0status;
+ isc_buffer_init(&b, tsigrcode, sizeof(tsigrcode) - 1);
+ tresult = dns_tsigrcode_totext(status, &b);
+ INSIST(tresult == ISC_R_SUCCESS);
+ tsigrcode[isc_buffer_usedlength(&b)] = '\0';
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, ISC_LOG_ERROR,
+ "request has invalid signature: %s (%s)",
+ isc_result_totext(result), tsigrcode);
+ }
+
+ /*
+ * Accept update messages signed by unknown keys so that
+ * update forwarding works transparently through slaves
+ * that don't have all the same keys as the master.
+ */
+ if (!(client->message->tsigstatus == dns_tsigerror_badkey &&
+ client->message->opcode == dns_opcode_update))
+ {
+ ns_client_error(client, sigresult);
+ isc_task_unpause(client->task);
+ return;
+ }
+ }
+
+ /*
+ * Decide whether recursive service is available to this client.
+ * We do this here rather than in the query code so that we can
+ * set the RA bit correctly on all kinds of responses, not just
+ * responses to ordinary queries. Note if you can't query the
+ * cache there is no point in setting RA.
+ */
+ ra = false;
+ if (client->view->resolver != NULL && client->view->recursion &&
+ ns_client_checkaclsilent(client, NULL, client->view->recursionacl,
+ true) == ISC_R_SUCCESS &&
+ ns_client_checkaclsilent(client, NULL, client->view->cacheacl,
+ true) == ISC_R_SUCCESS &&
+ ns_client_checkaclsilent(client, &client->destaddr,
+ client->view->recursiononacl,
+ true) == ISC_R_SUCCESS &&
+ ns_client_checkaclsilent(client, &client->destaddr,
+ client->view->cacheonacl,
+ true) == ISC_R_SUCCESS)
+ {
+ ra = true;
+ }
+
+ if (ra) {
+ client->attributes |= NS_CLIENTATTR_RA;
+ }
+
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY, NS_LOGMODULE_CLIENT,
+ ISC_LOG_DEBUG(3),
+ ra ? "recursion available" : "recursion not available");
+
+ /*
+ * Adjust maximum UDP response size for this client.
+ */
+ if (client->udpsize > 512) {
+ dns_peer_t *peer = NULL;
+ uint16_t udpsize = client->view->maxudp;
+ (void)dns_peerlist_peerbyaddr(client->view->peers, &netaddr,
+ &peer);
+ if (peer != NULL) {
+ dns_peer_getmaxudp(peer, &udpsize);
+ }
+ if (client->udpsize > udpsize) {
+ client->udpsize = udpsize;
+ }
+ }
+
+ /*
+ * Dispatch the request.
+ */
+ switch (client->message->opcode) {
+ case dns_opcode_query:
+ CTRACE("query");
+#ifdef HAVE_DNSTAP
+ if (ra && (client->message->flags & DNS_MESSAGEFLAG_RD) != 0) {
+ dtmsgtype = DNS_DTTYPE_CQ;
+ } else {
+ dtmsgtype = DNS_DTTYPE_AQ;
+ }
+
+ dns_dt_send(client->view, dtmsgtype, &client->peeraddr,
+ &client->destsockaddr, TCP_CLIENT(client), NULL,
+ &client->requesttime, NULL, buffer);
+#endif /* HAVE_DNSTAP */
+
+ ns_query_start(client, handle);
+ break;
+ case dns_opcode_update:
+ CTRACE("update");
+#ifdef HAVE_DNSTAP
+ dns_dt_send(client->view, DNS_DTTYPE_UQ, &client->peeraddr,
+ &client->destsockaddr, TCP_CLIENT(client), NULL,
+ &client->requesttime, NULL, buffer);
+#endif /* HAVE_DNSTAP */
+ ns_client_settimeout(client, 60);
+ ns_update_start(client, handle, sigresult);
+ break;
+ case dns_opcode_notify:
+ CTRACE("notify");
+ ns_client_settimeout(client, 60);
+ ns_notify_start(client, handle);
+ break;
+ case dns_opcode_iquery:
+ CTRACE("iquery");
+ ns_client_error(client, DNS_R_NOTIMP);
+ break;
+ default:
+ CTRACE("unknown opcode");
+ ns_client_error(client, DNS_R_NOTIMP);
+ }
+
+ isc_task_unpause(client->task);
+}
+
+isc_result_t
+ns__client_tcpconn(isc_nmhandle_t *handle, isc_result_t result, void *arg) {
+ ns_interface_t *ifp = (ns_interface_t *)arg;
+ dns_aclenv_t *env = ns_interfacemgr_getaclenv(ifp->mgr);
+ ns_server_t *sctx = ns_interfacemgr_getserver(ifp->mgr);
+ unsigned int tcpquota;
+ isc_sockaddr_t peeraddr;
+ isc_netaddr_t netaddr;
+ int match;
+
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ if (handle != NULL) {
+ peeraddr = isc_nmhandle_peeraddr(handle);
+ isc_netaddr_fromsockaddr(&netaddr, &peeraddr);
+
+ if (sctx->blackholeacl != NULL &&
+ (dns_acl_match(&netaddr, NULL, sctx->blackholeacl, env,
+ &match, NULL) == ISC_R_SUCCESS) &&
+ match > 0)
+ {
+ return (ISC_R_CONNREFUSED);
+ }
+ }
+
+ tcpquota = isc_quota_getused(&sctx->tcpquota);
+ ns_stats_update_if_greater(sctx->nsstats, ns_statscounter_tcphighwater,
+ tcpquota);
+
+ return (ISC_R_SUCCESS);
+}
+
+static void
+get_clientmctx(ns_clientmgr_t *manager, isc_mem_t **mctxp) {
+ isc_mem_t *clientmctx;
+ MTRACE("clientmctx");
+
+ int tid = isc_nm_tid();
+ if (tid < 0) {
+ tid = isc_random_uniform(manager->ncpus);
+ }
+ int rand = isc_random_uniform(CLIENT_NMCTXS_PERCPU);
+ int nextmctx = (rand * manager->ncpus) + tid;
+ clientmctx = manager->mctxpool[nextmctx];
+
+ isc_mem_attach(clientmctx, mctxp);
+}
+
+static void
+get_clienttask(ns_clientmgr_t *manager, isc_task_t **taskp) {
+ MTRACE("clienttask");
+
+ int tid = isc_nm_tid();
+ if (tid < 0) {
+ tid = isc_random_uniform(manager->ncpus);
+ }
+
+ int rand = isc_random_uniform(CLIENT_NTASKS_PERCPU);
+ int nexttask = (rand * manager->ncpus) + tid;
+ isc_task_attach(manager->taskpool[nexttask], taskp);
+}
+
+isc_result_t
+ns__client_setup(ns_client_t *client, ns_clientmgr_t *mgr, bool new) {
+ isc_result_t result;
+
+ /*
+ * Caller must be holding the manager lock.
+ *
+ * Note: creating a client does not add the client to the
+ * manager's client list or set the client's manager pointer.
+ * The caller is responsible for that.
+ */
+
+ REQUIRE(NS_CLIENT_VALID(client) || (new &&client != NULL));
+ REQUIRE(VALID_MANAGER(mgr) || !new);
+
+ if (new) {
+ *client = (ns_client_t){ .magic = 0 };
+
+ get_clientmctx(mgr, &client->mctx);
+ clientmgr_attach(mgr, &client->manager);
+ ns_server_attach(mgr->sctx, &client->sctx);
+ get_clienttask(mgr, &client->task);
+
+ dns_message_create(client->mctx, DNS_MESSAGE_INTENTPARSE,
+ &client->message);
+
+ client->sendbuf = isc_mem_get(client->mctx,
+ NS_CLIENT_SEND_BUFFER_SIZE);
+ /*
+ * Set magic earlier than usual because ns_query_init()
+ * and the functions it calls will require it.
+ */
+ client->magic = NS_CLIENT_MAGIC;
+ result = ns_query_init(client);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+ } else {
+ ns_clientmgr_t *oldmgr = client->manager;
+ ns_server_t *sctx = client->sctx;
+ isc_task_t *task = client->task;
+ unsigned char *sendbuf = client->sendbuf;
+ dns_message_t *message = client->message;
+ isc_mem_t *oldmctx = client->mctx;
+ ns_query_t query = client->query;
+
+ /*
+ * Retain these values from the existing client, but
+ * zero every thing else.
+ */
+ *client = (ns_client_t){ .magic = 0,
+ .mctx = oldmctx,
+ .manager = oldmgr,
+ .sctx = sctx,
+ .task = task,
+ .sendbuf = sendbuf,
+ .message = message,
+ .query = query };
+ }
+
+ client->query.attributes &= ~NS_QUERYATTR_ANSWERED;
+ client->state = NS_CLIENTSTATE_INACTIVE;
+ client->udpsize = 512;
+ client->ednsversion = -1;
+ dns_name_init(&client->signername, NULL);
+ dns_ecs_init(&client->ecs);
+ isc_sockaddr_any(&client->formerrcache.addr);
+ client->formerrcache.time = 0;
+ client->formerrcache.id = 0;
+ ISC_LINK_INIT(client, rlink);
+ client->rcode_override = -1; /* not set */
+
+ client->magic = NS_CLIENT_MAGIC;
+
+ CTRACE("client_setup");
+
+ return (ISC_R_SUCCESS);
+
+cleanup:
+ if (client->sendbuf != NULL) {
+ isc_mem_put(client->mctx, client->sendbuf,
+ NS_CLIENT_SEND_BUFFER_SIZE);
+ }
+
+ if (client->message != NULL) {
+ dns_message_detach(&client->message);
+ }
+
+ if (client->task != NULL) {
+ isc_task_detach(&client->task);
+ }
+
+ if (client->manager != NULL) {
+ clientmgr_detach(&client->manager);
+ }
+ if (client->mctx != NULL) {
+ isc_mem_detach(&client->mctx);
+ }
+ if (client->sctx != NULL) {
+ ns_server_detach(&client->sctx);
+ }
+
+ return (result);
+}
+
+bool
+ns_client_shuttingdown(ns_client_t *client) {
+ return (client->shuttingdown);
+}
+
+/***
+ *** Client Manager
+ ***/
+
+static void
+clientmgr_attach(ns_clientmgr_t *source, ns_clientmgr_t **targetp) {
+ int32_t oldrefs;
+
+ REQUIRE(VALID_MANAGER(source));
+ REQUIRE(targetp != NULL && *targetp == NULL);
+
+ oldrefs = isc_refcount_increment0(&source->references);
+ isc_log_write(ns_lctx, NS_LOGCATEGORY_CLIENT, NS_LOGMODULE_CLIENT,
+ ISC_LOG_DEBUG(3), "clientmgr @%p attach: %d", source,
+ oldrefs + 1);
+
+ *targetp = source;
+}
+
+static void
+clientmgr_detach(ns_clientmgr_t **mp) {
+ int32_t oldrefs;
+ ns_clientmgr_t *mgr = *mp;
+ *mp = NULL;
+
+ oldrefs = isc_refcount_decrement(&mgr->references);
+ isc_log_write(ns_lctx, NS_LOGCATEGORY_CLIENT, NS_LOGMODULE_CLIENT,
+ ISC_LOG_DEBUG(3), "clientmgr @%p detach: %d", mgr,
+ oldrefs - 1);
+ if (oldrefs == 1) {
+ clientmgr_destroy(mgr);
+ }
+}
+
+static void
+clientmgr_destroy(ns_clientmgr_t *manager) {
+ int i;
+
+ MTRACE("clientmgr_destroy");
+
+ isc_refcount_destroy(&manager->references);
+ manager->magic = 0;
+
+ for (i = 0; i < manager->ncpus * CLIENT_NMCTXS_PERCPU; i++) {
+ isc_mem_detach(&manager->mctxpool[i]);
+ }
+ isc_mem_put(manager->mctx, manager->mctxpool,
+ manager->ncpus * CLIENT_NMCTXS_PERCPU *
+ sizeof(isc_mem_t *));
+
+ if (manager->interface != NULL) {
+ ns_interface_detach(&manager->interface);
+ }
+
+ isc_mutex_destroy(&manager->lock);
+ isc_mutex_destroy(&manager->reclock);
+
+ if (manager->excl != NULL) {
+ isc_task_detach(&manager->excl);
+ }
+
+ for (i = 0; i < manager->ncpus * CLIENT_NTASKS_PERCPU; i++) {
+ if (manager->taskpool[i] != NULL) {
+ isc_task_detach(&manager->taskpool[i]);
+ }
+ }
+ isc_mem_put(manager->mctx, manager->taskpool,
+ manager->ncpus * CLIENT_NTASKS_PERCPU *
+ sizeof(isc_task_t *));
+ ns_server_detach(&manager->sctx);
+
+ isc_mem_put(manager->mctx, manager, sizeof(*manager));
+}
+
+isc_result_t
+ns_clientmgr_create(isc_mem_t *mctx, ns_server_t *sctx, isc_taskmgr_t *taskmgr,
+ isc_timermgr_t *timermgr, ns_interface_t *interface,
+ int ncpus, ns_clientmgr_t **managerp) {
+ ns_clientmgr_t *manager;
+ isc_result_t result;
+ int i;
+ int npools;
+
+ manager = isc_mem_get(mctx, sizeof(*manager));
+ *manager = (ns_clientmgr_t){ .magic = 0 };
+
+ isc_mutex_init(&manager->lock);
+ isc_mutex_init(&manager->reclock);
+
+ manager->excl = NULL;
+ result = isc_taskmgr_excltask(taskmgr, &manager->excl);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup_reclock;
+ }
+
+ manager->mctx = mctx;
+ manager->taskmgr = taskmgr;
+ manager->timermgr = timermgr;
+ manager->ncpus = ncpus;
+
+ ns_interface_attach(interface, &manager->interface);
+
+ manager->exiting = false;
+ int ntasks = CLIENT_NTASKS_PERCPU * manager->ncpus;
+ manager->taskpool = isc_mem_get(mctx, ntasks * sizeof(isc_task_t *));
+ for (i = 0; i < ntasks; i++) {
+ manager->taskpool[i] = NULL;
+ result = isc_task_create_bound(manager->taskmgr, 20,
+ &manager->taskpool[i],
+ i % CLIENT_NTASKS_PERCPU);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+ }
+ isc_refcount_init(&manager->references, 1);
+ manager->sctx = NULL;
+ ns_server_attach(sctx, &manager->sctx);
+
+ ISC_LIST_INIT(manager->recursing);
+
+ npools = CLIENT_NMCTXS_PERCPU * manager->ncpus;
+ manager->mctxpool = isc_mem_get(manager->mctx,
+ npools * sizeof(isc_mem_t *));
+ for (i = 0; i < npools; i++) {
+ manager->mctxpool[i] = NULL;
+ isc_mem_create(&manager->mctxpool[i]);
+ isc_mem_setname(manager->mctxpool[i], "client", NULL);
+ }
+
+ manager->magic = MANAGER_MAGIC;
+
+ MTRACE("create");
+
+ *managerp = manager;
+
+ return (ISC_R_SUCCESS);
+
+cleanup_reclock:
+ isc_mutex_destroy(&manager->reclock);
+ isc_mutex_destroy(&manager->lock);
+
+ isc_mem_put(mctx, manager, sizeof(*manager));
+
+ return (result);
+}
+
+void
+ns_clientmgr_shutdown(ns_clientmgr_t *manager) {
+ REQUIRE(VALID_MANAGER(manager));
+
+ LOCK(&manager->reclock);
+ for (ns_client_t *client = ISC_LIST_HEAD(manager->recursing);
+ client != NULL; client = ISC_LIST_NEXT(client, rlink))
+ {
+ ns_query_cancel(client);
+ }
+ UNLOCK(&manager->reclock);
+}
+
+void
+ns_clientmgr_destroy(ns_clientmgr_t **managerp) {
+ isc_result_t result;
+ ns_clientmgr_t *manager;
+ bool unlock = false;
+
+ REQUIRE(managerp != NULL);
+ manager = *managerp;
+ *managerp = NULL;
+ REQUIRE(VALID_MANAGER(manager));
+
+ MTRACE("destroy");
+
+ /*
+ * Check for success because we may already be task-exclusive
+ * at this point. Only if we succeed at obtaining an exclusive
+ * lock now will we need to relinquish it later.
+ */
+ result = isc_task_beginexclusive(manager->excl);
+ if (result == ISC_R_SUCCESS) {
+ unlock = true;
+ }
+
+ manager->exiting = true;
+
+ if (unlock) {
+ isc_task_endexclusive(manager->excl);
+ }
+
+ if (isc_refcount_decrement(&manager->references) == 1) {
+ clientmgr_destroy(manager);
+ }
+}
+
+isc_sockaddr_t *
+ns_client_getsockaddr(ns_client_t *client) {
+ return (&client->peeraddr);
+}
+
+isc_sockaddr_t *
+ns_client_getdestaddr(ns_client_t *client) {
+ return (&client->destsockaddr);
+}
+
+isc_result_t
+ns_client_checkaclsilent(ns_client_t *client, isc_netaddr_t *netaddr,
+ dns_acl_t *acl, bool default_allow) {
+ isc_result_t result;
+ dns_aclenv_t *env =
+ ns_interfacemgr_getaclenv(client->manager->interface->mgr);
+ isc_netaddr_t tmpnetaddr;
+ int match;
+
+ if (acl == NULL) {
+ if (default_allow) {
+ goto allow;
+ } else {
+ goto deny;
+ }
+ }
+
+ if (netaddr == NULL) {
+ isc_netaddr_fromsockaddr(&tmpnetaddr, &client->peeraddr);
+ netaddr = &tmpnetaddr;
+ }
+
+ result = dns_acl_match(netaddr, client->signer, acl, env, &match, NULL);
+ if (result != ISC_R_SUCCESS) {
+ goto deny; /* Internal error, already logged. */
+ }
+
+ if (match > 0) {
+ goto allow;
+ }
+ goto deny; /* Negative match or no match. */
+
+allow:
+ return (ISC_R_SUCCESS);
+
+deny:
+ return (DNS_R_REFUSED);
+}
+
+isc_result_t
+ns_client_checkacl(ns_client_t *client, isc_sockaddr_t *sockaddr,
+ const char *opname, dns_acl_t *acl, bool default_allow,
+ int log_level) {
+ isc_result_t result;
+ isc_netaddr_t netaddr;
+
+ if (sockaddr != NULL) {
+ isc_netaddr_fromsockaddr(&netaddr, sockaddr);
+ }
+
+ result = ns_client_checkaclsilent(client, sockaddr ? &netaddr : NULL,
+ acl, default_allow);
+
+ if (result == ISC_R_SUCCESS) {
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(3),
+ "%s approved", opname);
+ } else {
+ ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
+ NS_LOGMODULE_CLIENT, log_level, "%s denied",
+ opname);
+ }
+ return (result);
+}
+
+static void
+ns_client_name(ns_client_t *client, char *peerbuf, size_t len) {
+ if (client->peeraddr_valid) {
+ isc_sockaddr_format(&client->peeraddr, peerbuf,
+ (unsigned int)len);
+ } else {
+ snprintf(peerbuf, len, "@%p", client);
+ }
+}
+
+void
+ns_client_logv(ns_client_t *client, isc_logcategory_t *category,
+ isc_logmodule_t *module, int level, const char *fmt,
+ va_list ap) {
+ char msgbuf[4096];
+ char signerbuf[DNS_NAME_FORMATSIZE], qnamebuf[DNS_NAME_FORMATSIZE];
+ char peerbuf[ISC_SOCKADDR_FORMATSIZE];
+ const char *viewname = "";
+ const char *sep1 = "", *sep2 = "", *sep3 = "", *sep4 = "";
+ const char *signer = "", *qname = "";
+ dns_name_t *q = NULL;
+
+ REQUIRE(client != NULL);
+
+ vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
+
+ if (client->signer != NULL) {
+ dns_name_format(client->signer, signerbuf, sizeof(signerbuf));
+ sep1 = "/key ";
+ signer = signerbuf;
+ }
+
+ q = client->query.origqname != NULL ? client->query.origqname
+ : client->query.qname;
+ if (q != NULL) {
+ dns_name_format(q, qnamebuf, sizeof(qnamebuf));
+ sep2 = " (";
+ sep3 = ")";
+ qname = qnamebuf;
+ }
+
+ if (client->view != NULL && strcmp(client->view->name, "_bind") != 0 &&
+ strcmp(client->view->name, "_default") != 0)
+ {
+ sep4 = ": view ";
+ viewname = client->view->name;
+ }
+
+ if (client->peeraddr_valid) {
+ isc_sockaddr_format(&client->peeraddr, peerbuf,
+ sizeof(peerbuf));
+ } else {
+ snprintf(peerbuf, sizeof(peerbuf), "(no-peer)");
+ }
+
+ isc_log_write(ns_lctx, category, module, level,
+ "client @%p %s%s%s%s%s%s%s%s: %s", client, peerbuf, sep1,
+ signer, sep2, qname, sep3, sep4, viewname, msgbuf);
+}
+
+void
+ns_client_log(ns_client_t *client, isc_logcategory_t *category,
+ isc_logmodule_t *module, int level, const char *fmt, ...) {
+ va_list ap;
+
+ if (!isc_log_wouldlog(ns_lctx, level)) {
+ return;
+ }
+
+ va_start(ap, fmt);
+ ns_client_logv(client, category, module, level, fmt, ap);
+ va_end(ap);
+}
+
+void
+ns_client_aclmsg(const char *msg, const dns_name_t *name, dns_rdatatype_t type,
+ dns_rdataclass_t rdclass, char *buf, size_t len) {
+ char namebuf[DNS_NAME_FORMATSIZE];
+ char typebuf[DNS_RDATATYPE_FORMATSIZE];
+ char classbuf[DNS_RDATACLASS_FORMATSIZE];
+
+ dns_name_format(name, namebuf, sizeof(namebuf));
+ dns_rdatatype_format(type, typebuf, sizeof(typebuf));
+ dns_rdataclass_format(rdclass, classbuf, sizeof(classbuf));
+ (void)snprintf(buf, len, "%s '%s/%s/%s'", msg, namebuf, typebuf,
+ classbuf);
+}
+
+static void
+ns_client_dumpmessage(ns_client_t *client, const char *reason) {
+ isc_buffer_t buffer;
+ char *buf = NULL;
+ int len = 1024;
+ isc_result_t result;
+
+ if (!isc_log_wouldlog(ns_lctx, ISC_LOG_DEBUG(1))) {
+ return;
+ }
+
+ /*
+ * Note that these are multiline debug messages. We want a newline
+ * to appear in the log after each message.
+ */
+
+ do {
+ buf = isc_mem_get(client->mctx, len);
+ isc_buffer_init(&buffer, buf, len);
+ result = dns_message_totext(
+ client->message, &dns_master_style_debug, 0, &buffer);
+ if (result == ISC_R_NOSPACE) {
+ isc_mem_put(client->mctx, buf, len);
+ len += 1024;
+ } else if (result == ISC_R_SUCCESS) {
+ ns_client_log(client, NS_LOGCATEGORY_CLIENT,
+ NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(1),
+ "%s\n%.*s", reason,
+ (int)isc_buffer_usedlength(&buffer), buf);
+ }
+ } while (result == ISC_R_NOSPACE);
+
+ if (buf != NULL) {
+ isc_mem_put(client->mctx, buf, len);
+ }
+}
+
+void
+ns_client_dumprecursing(FILE *f, ns_clientmgr_t *manager) {
+ ns_client_t *client;
+ char namebuf[DNS_NAME_FORMATSIZE];
+ char original[DNS_NAME_FORMATSIZE];
+ char peerbuf[ISC_SOCKADDR_FORMATSIZE];
+ char typebuf[DNS_RDATATYPE_FORMATSIZE];
+ char classbuf[DNS_RDATACLASS_FORMATSIZE];
+ const char *name;
+ const char *sep;
+ const char *origfor;
+ dns_rdataset_t *rdataset;
+
+ REQUIRE(VALID_MANAGER(manager));
+
+ LOCK(&manager->reclock);
+ client = ISC_LIST_HEAD(manager->recursing);
+ while (client != NULL) {
+ INSIST(client->state == NS_CLIENTSTATE_RECURSING);
+
+ ns_client_name(client, peerbuf, sizeof(peerbuf));
+ if (client->view != NULL &&
+ strcmp(client->view->name, "_bind") != 0 &&
+ strcmp(client->view->name, "_default") != 0)
+ {
+ name = client->view->name;
+ sep = ": view ";
+ } else {
+ name = "";
+ sep = "";
+ }
+
+ LOCK(&client->query.fetchlock);
+ INSIST(client->query.qname != NULL);
+ dns_name_format(client->query.qname, namebuf, sizeof(namebuf));
+ if (client->query.qname != client->query.origqname &&
+ client->query.origqname != NULL)
+ {
+ origfor = " for ";
+ dns_name_format(client->query.origqname, original,
+ sizeof(original));
+ } else {
+ origfor = "";
+ original[0] = '\0';
+ }
+ rdataset = ISC_LIST_HEAD(client->query.qname->list);
+ if (rdataset == NULL && client->query.origqname != NULL) {
+ rdataset = ISC_LIST_HEAD(client->query.origqname->list);
+ }
+ if (rdataset != NULL) {
+ dns_rdatatype_format(rdataset->type, typebuf,
+ sizeof(typebuf));
+ dns_rdataclass_format(rdataset->rdclass, classbuf,
+ sizeof(classbuf));
+ } else {
+ strlcpy(typebuf, "-", sizeof(typebuf));
+ strlcpy(classbuf, "-", sizeof(classbuf));
+ }
+ UNLOCK(&client->query.fetchlock);
+ fprintf(f,
+ "; client %s%s%s: id %u '%s/%s/%s'%s%s "
+ "requesttime %u\n",
+ peerbuf, sep, name, client->message->id, namebuf,
+ typebuf, classbuf, origfor, original,
+ isc_time_seconds(&client->requesttime));
+ client = ISC_LIST_NEXT(client, rlink);
+ }
+ UNLOCK(&manager->reclock);
+}
+
+void
+ns_client_qnamereplace(ns_client_t *client, dns_name_t *name) {
+ LOCK(&client->query.fetchlock);
+ if (client->query.restarts > 0) {
+ /*
+ * client->query.qname was dynamically allocated.
+ */
+ dns_message_puttempname(client->message, &client->query.qname);
+ }
+ client->query.qname = name;
+ client->query.attributes &= ~NS_QUERYATTR_REDIRECT;
+ UNLOCK(&client->query.fetchlock);
+}
+
+isc_result_t
+ns_client_sourceip(dns_clientinfo_t *ci, isc_sockaddr_t **addrp) {
+ ns_client_t *client = (ns_client_t *)ci->data;
+
+ REQUIRE(NS_CLIENT_VALID(client));
+ REQUIRE(addrp != NULL);
+
+ *addrp = &client->peeraddr;
+ return (ISC_R_SUCCESS);
+}
+
+dns_rdataset_t *
+ns_client_newrdataset(ns_client_t *client) {
+ dns_rdataset_t *rdataset;
+ isc_result_t result;
+
+ REQUIRE(NS_CLIENT_VALID(client));
+
+ rdataset = NULL;
+ result = dns_message_gettemprdataset(client->message, &rdataset);
+ if (result != ISC_R_SUCCESS) {
+ return (NULL);
+ }
+
+ return (rdataset);
+}
+
+void
+ns_client_putrdataset(ns_client_t *client, dns_rdataset_t **rdatasetp) {
+ dns_rdataset_t *rdataset;
+
+ REQUIRE(NS_CLIENT_VALID(client));
+ REQUIRE(rdatasetp != NULL);
+
+ rdataset = *rdatasetp;
+
+ if (rdataset != NULL) {
+ if (dns_rdataset_isassociated(rdataset)) {
+ dns_rdataset_disassociate(rdataset);
+ }
+ dns_message_puttemprdataset(client->message, rdatasetp);
+ }
+}
+
+isc_result_t
+ns_client_newnamebuf(ns_client_t *client) {
+ isc_buffer_t *dbuf = NULL;
+
+ CTRACE("ns_client_newnamebuf");
+
+ isc_buffer_allocate(client->mctx, &dbuf, 1024);
+ ISC_LIST_APPEND(client->query.namebufs, dbuf, link);
+
+ CTRACE("ns_client_newnamebuf: done");
+ return (ISC_R_SUCCESS);
+}
+
+dns_name_t *
+ns_client_newname(ns_client_t *client, isc_buffer_t *dbuf, isc_buffer_t *nbuf) {
+ dns_name_t *name = NULL;
+ isc_region_t r;
+ isc_result_t result;
+
+ REQUIRE((client->query.attributes & NS_QUERYATTR_NAMEBUFUSED) == 0);
+
+ CTRACE("ns_client_newname");
+
+ result = dns_message_gettempname(client->message, &name);
+ if (result != ISC_R_SUCCESS) {
+ CTRACE("ns_client_newname: "
+ "dns_message_gettempname failed: done");
+ return (NULL);
+ }
+ isc_buffer_availableregion(dbuf, &r);
+ isc_buffer_init(nbuf, r.base, r.length);
+ dns_name_setbuffer(name, NULL);
+ dns_name_setbuffer(name, nbuf);
+ client->query.attributes |= NS_QUERYATTR_NAMEBUFUSED;
+
+ CTRACE("ns_client_newname: done");
+ return (name);
+}
+
+isc_buffer_t *
+ns_client_getnamebuf(ns_client_t *client) {
+ isc_buffer_t *dbuf;
+ isc_region_t r;
+
+ CTRACE("ns_client_getnamebuf");
+
+ /*%
+ * Return a name buffer with space for a maximal name, allocating
+ * a new one if necessary.
+ */
+ if (ISC_LIST_EMPTY(client->query.namebufs)) {
+ ns_client_newnamebuf(client);
+ }
+
+ dbuf = ISC_LIST_TAIL(client->query.namebufs);
+ INSIST(dbuf != NULL);
+ isc_buffer_availableregion(dbuf, &r);
+ if (r.length < DNS_NAME_MAXWIRE) {
+ ns_client_newnamebuf(client);
+ dbuf = ISC_LIST_TAIL(client->query.namebufs);
+ isc_buffer_availableregion(dbuf, &r);
+ INSIST(r.length >= 255);
+ }
+ CTRACE("ns_client_getnamebuf: done");
+ return (dbuf);
+}
+
+void
+ns_client_keepname(ns_client_t *client, dns_name_t *name, isc_buffer_t *dbuf) {
+ isc_region_t r;
+
+ CTRACE("ns_client_keepname");
+
+ /*%
+ * 'name' is using space in 'dbuf', but 'dbuf' has not yet been
+ * adjusted to take account of that. We do the adjustment.
+ */
+ REQUIRE((client->query.attributes & NS_QUERYATTR_NAMEBUFUSED) != 0);
+
+ dns_name_toregion(name, &r);
+ isc_buffer_add(dbuf, r.length);
+ dns_name_setbuffer(name, NULL);
+ client->query.attributes &= ~NS_QUERYATTR_NAMEBUFUSED;
+}
+
+void
+ns_client_releasename(ns_client_t *client, dns_name_t **namep) {
+ /*%
+ * 'name' is no longer needed. Return it to our pool of temporary
+ * names. If it is using a name buffer, relinquish its exclusive
+ * rights on the buffer.
+ */
+
+ CTRACE("ns_client_releasename");
+ client->query.attributes &= ~NS_QUERYATTR_NAMEBUFUSED;
+ dns_message_puttempname(client->message, namep);
+ CTRACE("ns_client_releasename: done");
+}
+
+isc_result_t
+ns_client_newdbversion(ns_client_t *client, unsigned int n) {
+ unsigned int i;
+ ns_dbversion_t *dbversion = NULL;
+
+ for (i = 0; i < n; i++) {
+ dbversion = isc_mem_get(client->mctx, sizeof(*dbversion));
+ *dbversion = (ns_dbversion_t){ 0 };
+ ISC_LIST_INITANDAPPEND(client->query.freeversions, dbversion,
+ link);
+ }
+
+ return (ISC_R_SUCCESS);
+}
+
+static ns_dbversion_t *
+client_getdbversion(ns_client_t *client) {
+ ns_dbversion_t *dbversion = NULL;
+
+ if (ISC_LIST_EMPTY(client->query.freeversions)) {
+ ns_client_newdbversion(client, 1);
+ }
+ dbversion = ISC_LIST_HEAD(client->query.freeversions);
+ INSIST(dbversion != NULL);
+ ISC_LIST_UNLINK(client->query.freeversions, dbversion, link);
+
+ return (dbversion);
+}
+
+ns_dbversion_t *
+ns_client_findversion(ns_client_t *client, dns_db_t *db) {
+ ns_dbversion_t *dbversion;
+
+ for (dbversion = ISC_LIST_HEAD(client->query.activeversions);
+ dbversion != NULL; dbversion = ISC_LIST_NEXT(dbversion, link))
+ {
+ if (dbversion->db == db) {
+ break;
+ }
+ }
+
+ if (dbversion == NULL) {
+ /*
+ * This is a new zone for this query. Add it to
+ * the active list.
+ */
+ dbversion = client_getdbversion(client);
+ if (dbversion == NULL) {
+ return (NULL);
+ }
+ dns_db_attach(db, &dbversion->db);
+ dns_db_currentversion(db, &dbversion->version);
+ dbversion->acl_checked = false;
+ dbversion->queryok = false;
+ ISC_LIST_APPEND(client->query.activeversions, dbversion, link);
+ }
+
+ return (dbversion);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 16:17:19 +0000