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206909d52b
Signed-off-by: Thomas Debesse <dev@illwieckz.net> Reviewed-by: Andrew Bartlett <abartlet@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org> Autobuild-User(master): Jeremy Allison <jra@samba.org> Autobuild-Date(master): Fri Mar 25 20:25:28 UTC 2022 on sn-devel-184
942 lines
25 KiB
C
942 lines
25 KiB
C
/*
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Unix SMB/CIFS implementation.
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DNS server startup
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Copyright (C) 2010 Kai Blin <kai@samba.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "samba/service_task.h"
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#include "samba/service.h"
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#include "samba/service_stream.h"
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#include "samba/process_model.h"
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#include "lib/events/events.h"
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#include "lib/socket/socket.h"
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#include "lib/tsocket/tsocket.h"
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#include "libcli/util/tstream.h"
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#include "libcli/util/ntstatus.h"
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#include "system/network.h"
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#include "lib/stream/packet.h"
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#include "lib/socket/netif.h"
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#include "dns_server/dns_server.h"
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#include "param/param.h"
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#include "librpc/ndr/libndr.h"
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#include "librpc/gen_ndr/ndr_dns.h"
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#include "librpc/gen_ndr/ndr_dnsp.h"
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#include <ldb.h>
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#include "dsdb/samdb/samdb.h"
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#include "dsdb/common/util.h"
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#include "auth/session.h"
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#include "lib/util/dlinklist.h"
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#include "lib/util/tevent_werror.h"
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#include "auth/auth.h"
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#include "auth/credentials/credentials.h"
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#include "librpc/gen_ndr/ndr_irpc.h"
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#include "lib/messaging/irpc.h"
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#include "libds/common/roles.h"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_DNS
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NTSTATUS server_service_dns_init(TALLOC_CTX *);
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/* hold information about one dns socket */
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struct dns_socket {
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struct dns_server *dns;
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struct tsocket_address *local_address;
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};
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struct dns_udp_socket {
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struct dns_socket *dns_socket;
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struct tdgram_context *dgram;
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struct tevent_queue *send_queue;
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};
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/*
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state of an open tcp connection
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*/
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struct dns_tcp_connection {
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/* stream connection we belong to */
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struct stream_connection *conn;
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/* the dns_server the connection belongs to */
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struct dns_socket *dns_socket;
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struct tstream_context *tstream;
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struct tevent_queue *send_queue;
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};
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static void dns_tcp_terminate_connection(struct dns_tcp_connection *dnsconn, const char *reason)
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{
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stream_terminate_connection(dnsconn->conn, reason);
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}
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static void dns_tcp_recv(struct stream_connection *conn, uint16_t flags)
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{
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struct dns_tcp_connection *dnsconn = talloc_get_type(conn->private_data,
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struct dns_tcp_connection);
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/* this should never be triggered! */
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dns_tcp_terminate_connection(dnsconn, "dns_tcp_recv: called");
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}
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static void dns_tcp_send(struct stream_connection *conn, uint16_t flags)
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{
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struct dns_tcp_connection *dnsconn = talloc_get_type(conn->private_data,
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struct dns_tcp_connection);
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/* this should never be triggered! */
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dns_tcp_terminate_connection(dnsconn, "dns_tcp_send: called");
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}
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struct dns_process_state {
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DATA_BLOB *in;
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struct dns_server *dns;
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struct dns_name_packet in_packet;
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struct dns_request_state state;
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uint16_t dns_err;
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struct dns_name_packet out_packet;
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DATA_BLOB out;
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};
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static void dns_process_done(struct tevent_req *subreq);
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static struct tevent_req *dns_process_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct dns_server *dns,
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const struct tsocket_address *remote_address,
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const struct tsocket_address *local_address,
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DATA_BLOB *in)
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{
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struct tevent_req *req, *subreq;
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struct dns_process_state *state;
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enum ndr_err_code ndr_err;
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WERROR ret;
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const char **forwarder = lpcfg_dns_forwarder(dns->task->lp_ctx);
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req = tevent_req_create(mem_ctx, &state, struct dns_process_state);
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if (req == NULL) {
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return NULL;
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}
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state->state.mem_ctx = state;
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state->in = in;
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state->dns = dns;
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if (in->length < 12) {
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tevent_req_werror(req, WERR_INVALID_PARAMETER);
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return tevent_req_post(req, ev);
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}
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dump_data_dbgc(DBGC_DNS, 8, in->data, in->length);
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ndr_err = ndr_pull_struct_blob(
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in, state, &state->in_packet,
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(ndr_pull_flags_fn_t)ndr_pull_dns_name_packet);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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state->dns_err = DNS_RCODE_FORMERR;
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tevent_req_done(req);
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return tevent_req_post(req, ev);
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}
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if (DEBUGLVLC(DBGC_DNS, 8)) {
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NDR_PRINT_DEBUGC(DBGC_DNS, dns_name_packet, &state->in_packet);
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}
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if (state->in_packet.operation & DNS_FLAG_REPLY) {
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DEBUG(1, ("Won't reply to replies.\n"));
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tevent_req_werror(req, WERR_INVALID_PARAMETER);
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return tevent_req_post(req, ev);
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}
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state->state.flags = state->in_packet.operation;
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state->state.flags |= DNS_FLAG_REPLY;
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state->state.local_address = local_address;
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state->state.remote_address = remote_address;
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if (forwarder && *forwarder && **forwarder) {
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state->state.flags |= DNS_FLAG_RECURSION_AVAIL;
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}
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state->out_packet = state->in_packet;
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ret = dns_verify_tsig(dns, state, &state->state,
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&state->out_packet, in);
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if (!W_ERROR_IS_OK(ret)) {
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state->dns_err = werr_to_dns_err(ret);
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tevent_req_done(req);
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return tevent_req_post(req, ev);
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}
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switch (state->in_packet.operation & DNS_OPCODE) {
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case DNS_OPCODE_QUERY:
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subreq = dns_server_process_query_send(
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state, ev, dns,
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&state->state, &state->in_packet);
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if (tevent_req_nomem(subreq, req)) {
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return tevent_req_post(req, ev);
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}
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tevent_req_set_callback(subreq, dns_process_done, req);
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return req;
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case DNS_OPCODE_UPDATE:
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ret = dns_server_process_update(
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dns, &state->state, state, &state->in_packet,
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&state->out_packet.answers, &state->out_packet.ancount,
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&state->out_packet.nsrecs, &state->out_packet.nscount,
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&state->out_packet.additional,
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&state->out_packet.arcount);
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break;
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default:
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ret = WERR_DNS_ERROR_RCODE_NOT_IMPLEMENTED;
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}
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if (!W_ERROR_IS_OK(ret)) {
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state->dns_err = werr_to_dns_err(ret);
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}
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tevent_req_done(req);
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return tevent_req_post(req, ev);
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}
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static void dns_process_done(struct tevent_req *subreq)
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{
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struct tevent_req *req = tevent_req_callback_data(
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subreq, struct tevent_req);
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struct dns_process_state *state = tevent_req_data(
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req, struct dns_process_state);
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WERROR ret;
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ret = dns_server_process_query_recv(
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subreq, state,
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&state->out_packet.answers, &state->out_packet.ancount,
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&state->out_packet.nsrecs, &state->out_packet.nscount,
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&state->out_packet.additional, &state->out_packet.arcount);
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TALLOC_FREE(subreq);
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if (!W_ERROR_IS_OK(ret)) {
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state->dns_err = werr_to_dns_err(ret);
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}
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tevent_req_done(req);
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}
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static WERROR dns_process_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
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DATA_BLOB *out)
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{
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struct dns_process_state *state = tevent_req_data(
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req, struct dns_process_state);
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enum ndr_err_code ndr_err;
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WERROR ret;
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if (tevent_req_is_werror(req, &ret)) {
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return ret;
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}
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if ((state->dns_err != DNS_RCODE_OK) &&
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(state->dns_err != DNS_RCODE_NXDOMAIN) &&
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(state->dns_err != DNS_RCODE_NOTAUTH))
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{
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goto drop;
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}
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if (state->dns_err != DNS_RCODE_OK) {
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state->out_packet.operation |= state->dns_err;
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}
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state->out_packet.operation |= state->state.flags;
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if (state->state.sign) {
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ret = dns_sign_tsig(state->dns, mem_ctx, &state->state,
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&state->out_packet, 0);
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if (!W_ERROR_IS_OK(ret)) {
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state->dns_err = DNS_RCODE_SERVFAIL;
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goto drop;
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}
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}
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if (DEBUGLVLC(DBGC_DNS, 8)) {
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NDR_PRINT_DEBUGC(DBGC_DNS, dns_name_packet, &state->out_packet);
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}
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ndr_err = ndr_push_struct_blob(
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out, mem_ctx, &state->out_packet,
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(ndr_push_flags_fn_t)ndr_push_dns_name_packet);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DEBUG(1, ("Failed to push packet: %s!\n",
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ndr_errstr(ndr_err)));
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state->dns_err = DNS_RCODE_SERVFAIL;
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goto drop;
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}
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return WERR_OK;
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drop:
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*out = data_blob_talloc(mem_ctx, state->in->data, state->in->length);
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if (out->data == NULL) {
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return WERR_NOT_ENOUGH_MEMORY;
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}
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out->data[2] |= 0x80; /* Toggle DNS_FLAG_REPLY */
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out->data[3] |= state->dns_err;
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return WERR_OK;
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}
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struct dns_tcp_call {
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struct dns_tcp_connection *dns_conn;
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DATA_BLOB in;
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DATA_BLOB out;
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uint8_t out_hdr[4];
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struct iovec out_iov[2];
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};
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static void dns_tcp_call_process_done(struct tevent_req *subreq);
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static void dns_tcp_call_writev_done(struct tevent_req *subreq);
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static void dns_tcp_call_loop(struct tevent_req *subreq)
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{
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struct dns_tcp_connection *dns_conn = tevent_req_callback_data(subreq,
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struct dns_tcp_connection);
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struct dns_server *dns = dns_conn->dns_socket->dns;
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struct dns_tcp_call *call;
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NTSTATUS status;
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call = talloc(dns_conn, struct dns_tcp_call);
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if (call == NULL) {
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dns_tcp_terminate_connection(dns_conn, "dns_tcp_call_loop: "
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"no memory for dns_tcp_call");
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return;
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}
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call->dns_conn = dns_conn;
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status = tstream_read_pdu_blob_recv(subreq,
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call,
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&call->in);
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TALLOC_FREE(subreq);
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if (!NT_STATUS_IS_OK(status)) {
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const char *reason;
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reason = talloc_asprintf(call, "dns_tcp_call_loop: "
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"tstream_read_pdu_blob_recv() - %s",
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nt_errstr(status));
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if (!reason) {
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reason = nt_errstr(status);
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}
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dns_tcp_terminate_connection(dns_conn, reason);
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return;
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}
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DEBUG(10,("Received DNS TCP packet of length %lu from %s\n",
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(long) call->in.length,
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tsocket_address_string(dns_conn->conn->remote_address, call)));
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/* skip length header */
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call->in.data += 2;
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call->in.length -= 2;
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subreq = dns_process_send(call, dns->task->event_ctx, dns,
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dns_conn->conn->remote_address,
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dns_conn->conn->local_address,
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&call->in);
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if (subreq == NULL) {
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dns_tcp_terminate_connection(
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dns_conn, "dns_tcp_call_loop: dns_process_send "
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"failed\n");
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return;
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}
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tevent_req_set_callback(subreq, dns_tcp_call_process_done, call);
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/*
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* The dns tcp pdu's has the length as 2 byte (initial_read_size),
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* packet_full_request_u16 provides the pdu length then.
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*/
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subreq = tstream_read_pdu_blob_send(dns_conn,
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dns_conn->conn->event.ctx,
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dns_conn->tstream,
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2, /* initial_read_size */
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packet_full_request_u16,
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dns_conn);
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if (subreq == NULL) {
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dns_tcp_terminate_connection(dns_conn, "dns_tcp_call_loop: "
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"no memory for tstream_read_pdu_blob_send");
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return;
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}
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tevent_req_set_callback(subreq, dns_tcp_call_loop, dns_conn);
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}
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|
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static void dns_tcp_call_process_done(struct tevent_req *subreq)
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{
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struct dns_tcp_call *call = tevent_req_callback_data(subreq,
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struct dns_tcp_call);
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struct dns_tcp_connection *dns_conn = call->dns_conn;
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WERROR err;
|
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err = dns_process_recv(subreq, call, &call->out);
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TALLOC_FREE(subreq);
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if (!W_ERROR_IS_OK(err)) {
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DEBUG(1, ("dns_process returned %s\n", win_errstr(err)));
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dns_tcp_terminate_connection(dns_conn,
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"dns_tcp_call_loop: process function failed");
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return;
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}
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/* First add the length of the out buffer */
|
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RSSVAL(call->out_hdr, 0, call->out.length);
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call->out_iov[0].iov_base = (char *) call->out_hdr;
|
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call->out_iov[0].iov_len = 2;
|
|
|
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call->out_iov[1].iov_base = (char *) call->out.data;
|
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call->out_iov[1].iov_len = call->out.length;
|
|
|
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subreq = tstream_writev_queue_send(call,
|
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dns_conn->conn->event.ctx,
|
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dns_conn->tstream,
|
|
dns_conn->send_queue,
|
|
call->out_iov, 2);
|
|
if (subreq == NULL) {
|
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dns_tcp_terminate_connection(dns_conn, "dns_tcp_call_loop: "
|
|
"no memory for tstream_writev_queue_send");
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return;
|
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}
|
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tevent_req_set_callback(subreq, dns_tcp_call_writev_done, call);
|
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}
|
|
|
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static void dns_tcp_call_writev_done(struct tevent_req *subreq)
|
|
{
|
|
struct dns_tcp_call *call = tevent_req_callback_data(subreq,
|
|
struct dns_tcp_call);
|
|
int sys_errno;
|
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int rc;
|
|
|
|
rc = tstream_writev_queue_recv(subreq, &sys_errno);
|
|
TALLOC_FREE(subreq);
|
|
if (rc == -1) {
|
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const char *reason;
|
|
|
|
reason = talloc_asprintf(call, "dns_tcp_call_writev_done: "
|
|
"tstream_writev_queue_recv() - %d:%s",
|
|
sys_errno, strerror(sys_errno));
|
|
if (!reason) {
|
|
reason = "dns_tcp_call_writev_done: tstream_writev_queue_recv() failed";
|
|
}
|
|
|
|
dns_tcp_terminate_connection(call->dns_conn, reason);
|
|
return;
|
|
}
|
|
|
|
/* We don't care about errors */
|
|
|
|
talloc_free(call);
|
|
}
|
|
|
|
/*
|
|
called when we get a new connection
|
|
*/
|
|
static void dns_tcp_accept(struct stream_connection *conn)
|
|
{
|
|
struct dns_socket *dns_socket;
|
|
struct dns_tcp_connection *dns_conn;
|
|
struct tevent_req *subreq;
|
|
int rc;
|
|
|
|
dns_conn = talloc_zero(conn, struct dns_tcp_connection);
|
|
if (dns_conn == NULL) {
|
|
stream_terminate_connection(conn,
|
|
"dns_tcp_accept: out of memory");
|
|
return;
|
|
}
|
|
|
|
dns_conn->send_queue = tevent_queue_create(conn, "dns_tcp_accept");
|
|
if (dns_conn->send_queue == NULL) {
|
|
stream_terminate_connection(conn,
|
|
"dns_tcp_accept: out of memory");
|
|
return;
|
|
}
|
|
|
|
dns_socket = talloc_get_type(conn->private_data, struct dns_socket);
|
|
|
|
TALLOC_FREE(conn->event.fde);
|
|
|
|
rc = tstream_bsd_existing_socket(dns_conn,
|
|
socket_get_fd(conn->socket),
|
|
&dns_conn->tstream);
|
|
if (rc < 0) {
|
|
stream_terminate_connection(conn,
|
|
"dns_tcp_accept: out of memory");
|
|
return;
|
|
}
|
|
|
|
dns_conn->conn = conn;
|
|
dns_conn->dns_socket = dns_socket;
|
|
conn->private_data = dns_conn;
|
|
|
|
/*
|
|
* The dns tcp pdu's has the length as 2 byte (initial_read_size),
|
|
* packet_full_request_u16 provides the pdu length then.
|
|
*/
|
|
subreq = tstream_read_pdu_blob_send(dns_conn,
|
|
dns_conn->conn->event.ctx,
|
|
dns_conn->tstream,
|
|
2, /* initial_read_size */
|
|
packet_full_request_u16,
|
|
dns_conn);
|
|
if (subreq == NULL) {
|
|
dns_tcp_terminate_connection(dns_conn, "dns_tcp_accept: "
|
|
"no memory for tstream_read_pdu_blob_send");
|
|
return;
|
|
}
|
|
tevent_req_set_callback(subreq, dns_tcp_call_loop, dns_conn);
|
|
}
|
|
|
|
static const struct stream_server_ops dns_tcp_stream_ops = {
|
|
.name = "dns_tcp",
|
|
.accept_connection = dns_tcp_accept,
|
|
.recv_handler = dns_tcp_recv,
|
|
.send_handler = dns_tcp_send
|
|
};
|
|
|
|
struct dns_udp_call {
|
|
struct dns_udp_socket *sock;
|
|
struct tsocket_address *src;
|
|
DATA_BLOB in;
|
|
DATA_BLOB out;
|
|
};
|
|
|
|
static void dns_udp_call_process_done(struct tevent_req *subreq);
|
|
static void dns_udp_call_sendto_done(struct tevent_req *subreq);
|
|
|
|
static void dns_udp_call_loop(struct tevent_req *subreq)
|
|
{
|
|
struct dns_udp_socket *sock = tevent_req_callback_data(subreq,
|
|
struct dns_udp_socket);
|
|
struct dns_server *dns = sock->dns_socket->dns;
|
|
struct dns_udp_call *call;
|
|
uint8_t *buf;
|
|
ssize_t len;
|
|
int sys_errno;
|
|
|
|
call = talloc(sock, struct dns_udp_call);
|
|
if (call == NULL) {
|
|
talloc_free(call);
|
|
goto done;
|
|
}
|
|
call->sock = sock;
|
|
|
|
len = tdgram_recvfrom_recv(subreq, &sys_errno,
|
|
call, &buf, &call->src);
|
|
TALLOC_FREE(subreq);
|
|
if (len == -1) {
|
|
talloc_free(call);
|
|
goto done;
|
|
}
|
|
|
|
call->in.data = buf;
|
|
call->in.length = len;
|
|
|
|
DEBUG(10,("Received DNS UDP packet of length %lu from %s\n",
|
|
(long)call->in.length,
|
|
tsocket_address_string(call->src, call)));
|
|
|
|
subreq = dns_process_send(call, dns->task->event_ctx, dns,
|
|
call->src,
|
|
sock->dns_socket->local_address,
|
|
&call->in);
|
|
if (subreq == NULL) {
|
|
TALLOC_FREE(call);
|
|
goto done;
|
|
}
|
|
tevent_req_set_callback(subreq, dns_udp_call_process_done, call);
|
|
|
|
done:
|
|
subreq = tdgram_recvfrom_send(sock,
|
|
sock->dns_socket->dns->task->event_ctx,
|
|
sock->dgram);
|
|
if (subreq == NULL) {
|
|
task_server_terminate(sock->dns_socket->dns->task,
|
|
"no memory for tdgram_recvfrom_send",
|
|
true);
|
|
return;
|
|
}
|
|
tevent_req_set_callback(subreq, dns_udp_call_loop, sock);
|
|
}
|
|
|
|
static void dns_udp_call_process_done(struct tevent_req *subreq)
|
|
{
|
|
struct dns_udp_call *call = tevent_req_callback_data(
|
|
subreq, struct dns_udp_call);
|
|
struct dns_udp_socket *sock = call->sock;
|
|
struct dns_server *dns = sock->dns_socket->dns;
|
|
WERROR err;
|
|
|
|
err = dns_process_recv(subreq, call, &call->out);
|
|
TALLOC_FREE(subreq);
|
|
if (!W_ERROR_IS_OK(err)) {
|
|
DEBUG(1, ("dns_process returned %s\n", win_errstr(err)));
|
|
TALLOC_FREE(call);
|
|
return;
|
|
}
|
|
|
|
subreq = tdgram_sendto_queue_send(call,
|
|
dns->task->event_ctx,
|
|
sock->dgram,
|
|
sock->send_queue,
|
|
call->out.data,
|
|
call->out.length,
|
|
call->src);
|
|
if (subreq == NULL) {
|
|
talloc_free(call);
|
|
return;
|
|
}
|
|
tevent_req_set_callback(subreq, dns_udp_call_sendto_done, call);
|
|
|
|
}
|
|
static void dns_udp_call_sendto_done(struct tevent_req *subreq)
|
|
{
|
|
struct dns_udp_call *call = tevent_req_callback_data(subreq,
|
|
struct dns_udp_call);
|
|
int sys_errno;
|
|
|
|
tdgram_sendto_queue_recv(subreq, &sys_errno);
|
|
|
|
/* We don't care about errors */
|
|
|
|
talloc_free(call);
|
|
}
|
|
|
|
/*
|
|
start listening on the given address
|
|
*/
|
|
static NTSTATUS dns_add_socket(struct dns_server *dns,
|
|
const struct model_ops *model_ops,
|
|
const char *name,
|
|
const char *address,
|
|
uint16_t port)
|
|
{
|
|
struct dns_socket *dns_socket;
|
|
struct dns_udp_socket *dns_udp_socket;
|
|
struct tevent_req *udpsubreq;
|
|
NTSTATUS status;
|
|
int ret;
|
|
|
|
dns_socket = talloc(dns, struct dns_socket);
|
|
NT_STATUS_HAVE_NO_MEMORY(dns_socket);
|
|
|
|
dns_socket->dns = dns;
|
|
|
|
ret = tsocket_address_inet_from_strings(dns_socket, "ip",
|
|
address, port,
|
|
&dns_socket->local_address);
|
|
if (ret != 0) {
|
|
status = map_nt_error_from_unix_common(errno);
|
|
return status;
|
|
}
|
|
|
|
status = stream_setup_socket(dns->task,
|
|
dns->task->event_ctx,
|
|
dns->task->lp_ctx,
|
|
model_ops,
|
|
&dns_tcp_stream_ops,
|
|
"ip", address, &port,
|
|
lpcfg_socket_options(dns->task->lp_ctx),
|
|
dns_socket,
|
|
dns->task->process_context);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
|
|
address, port, nt_errstr(status)));
|
|
talloc_free(dns_socket);
|
|
return status;
|
|
}
|
|
|
|
dns_udp_socket = talloc(dns_socket, struct dns_udp_socket);
|
|
NT_STATUS_HAVE_NO_MEMORY(dns_udp_socket);
|
|
|
|
dns_udp_socket->dns_socket = dns_socket;
|
|
|
|
ret = tdgram_inet_udp_socket(dns_socket->local_address,
|
|
NULL,
|
|
dns_udp_socket,
|
|
&dns_udp_socket->dgram);
|
|
if (ret != 0) {
|
|
status = map_nt_error_from_unix_common(errno);
|
|
DEBUG(0,("Failed to bind to %s:%u UDP - %s\n",
|
|
address, port, nt_errstr(status)));
|
|
return status;
|
|
}
|
|
|
|
dns_udp_socket->send_queue = tevent_queue_create(dns_udp_socket,
|
|
"dns_udp_send_queue");
|
|
NT_STATUS_HAVE_NO_MEMORY(dns_udp_socket->send_queue);
|
|
|
|
udpsubreq = tdgram_recvfrom_send(dns_udp_socket,
|
|
dns->task->event_ctx,
|
|
dns_udp_socket->dgram);
|
|
NT_STATUS_HAVE_NO_MEMORY(udpsubreq);
|
|
tevent_req_set_callback(udpsubreq, dns_udp_call_loop, dns_udp_socket);
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/*
|
|
setup our listening sockets on the configured network interfaces
|
|
*/
|
|
static NTSTATUS dns_startup_interfaces(struct dns_server *dns,
|
|
struct interface *ifaces,
|
|
const struct model_ops *model_ops)
|
|
{
|
|
size_t num_interfaces;
|
|
TALLOC_CTX *tmp_ctx = talloc_new(dns);
|
|
NTSTATUS status;
|
|
int i;
|
|
|
|
if (ifaces != NULL) {
|
|
num_interfaces = iface_list_count(ifaces);
|
|
|
|
for (i=0; i<num_interfaces; i++) {
|
|
const char *address = talloc_strdup(tmp_ctx,
|
|
iface_list_n_ip(ifaces, i));
|
|
|
|
status = dns_add_socket(dns, model_ops, "dns", address,
|
|
lpcfg_dns_port(dns->task->lp_ctx));
|
|
NT_STATUS_NOT_OK_RETURN(status);
|
|
}
|
|
} else {
|
|
size_t num_binds = 0;
|
|
char **wcard;
|
|
wcard = iface_list_wildcard(tmp_ctx);
|
|
if (wcard == NULL) {
|
|
DEBUG(0, ("No wildcard address available\n"));
|
|
return NT_STATUS_INTERNAL_ERROR;
|
|
}
|
|
for (i = 0; wcard[i] != NULL; i++) {
|
|
status = dns_add_socket(dns, model_ops, "dns", wcard[i],
|
|
lpcfg_dns_port(dns->task->lp_ctx));
|
|
if (NT_STATUS_IS_OK(status)) {
|
|
num_binds++;
|
|
}
|
|
}
|
|
if (num_binds == 0) {
|
|
talloc_free(tmp_ctx);
|
|
return NT_STATUS_INVALID_PARAMETER_MIX;
|
|
}
|
|
}
|
|
|
|
talloc_free(tmp_ctx);
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
static struct dns_server_tkey_store *tkey_store_init(TALLOC_CTX *mem_ctx,
|
|
uint16_t size)
|
|
{
|
|
struct dns_server_tkey_store *buffer = talloc_zero(mem_ctx,
|
|
struct dns_server_tkey_store);
|
|
|
|
if (buffer == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
buffer->size = size;
|
|
buffer->next_idx = 0;
|
|
|
|
buffer->tkeys = talloc_zero_array(buffer, struct dns_server_tkey *, size);
|
|
if (buffer->tkeys == NULL) {
|
|
TALLOC_FREE(buffer);
|
|
}
|
|
|
|
return buffer;
|
|
}
|
|
|
|
static NTSTATUS dns_server_reload_zones(struct dns_server *dns)
|
|
{
|
|
NTSTATUS status;
|
|
struct dns_server_zone *new_list = NULL;
|
|
struct dns_server_zone *old_list = dns->zones;
|
|
struct dns_server_zone *old_zone;
|
|
status = dns_common_zones(dns->samdb, dns, NULL, &new_list);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
dns->zones = new_list;
|
|
while ((old_zone = DLIST_TAIL(old_list)) != NULL) {
|
|
DLIST_REMOVE(old_list, old_zone);
|
|
talloc_free(old_zone);
|
|
}
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/**
|
|
* Called when the internal DNS server should reload the zones from DB, for
|
|
* example, when zones are added or deleted through RPC or replicated by
|
|
* inbound DRS.
|
|
*/
|
|
static NTSTATUS dns_reload_zones(struct irpc_message *msg,
|
|
struct dnssrv_reload_dns_zones *r)
|
|
{
|
|
struct dns_server *dns;
|
|
|
|
dns = talloc_get_type(msg->private_data, struct dns_server);
|
|
if (dns == NULL) {
|
|
r->out.result = NT_STATUS_INTERNAL_ERROR;
|
|
return NT_STATUS_INTERNAL_ERROR;
|
|
}
|
|
|
|
r->out.result = dns_server_reload_zones(dns);
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
static NTSTATUS dns_task_init(struct task_server *task)
|
|
{
|
|
struct dns_server *dns;
|
|
NTSTATUS status;
|
|
struct interface *ifaces = NULL;
|
|
int ret;
|
|
static const char * const attrs_none[] = { NULL};
|
|
struct ldb_message *dns_acc;
|
|
char *hostname_lower;
|
|
char *dns_spn;
|
|
bool ok;
|
|
|
|
switch (lpcfg_server_role(task->lp_ctx)) {
|
|
case ROLE_STANDALONE:
|
|
task_server_terminate(task, "dns: no DNS required in standalone configuration", false);
|
|
return NT_STATUS_INVALID_DOMAIN_ROLE;
|
|
case ROLE_DOMAIN_MEMBER:
|
|
task_server_terminate(task, "dns: no DNS required in member server configuration", false);
|
|
return NT_STATUS_INVALID_DOMAIN_ROLE;
|
|
case ROLE_ACTIVE_DIRECTORY_DC:
|
|
/* Yes, we want a DNS */
|
|
break;
|
|
}
|
|
|
|
if (lpcfg_interfaces(task->lp_ctx) && lpcfg_bind_interfaces_only(task->lp_ctx)) {
|
|
load_interface_list(task, task->lp_ctx, &ifaces);
|
|
|
|
if (iface_list_count(ifaces) == 0) {
|
|
task_server_terminate(task, "dns: no network interfaces configured", false);
|
|
return NT_STATUS_UNSUCCESSFUL;
|
|
}
|
|
}
|
|
|
|
task_server_set_title(task, "task[dns]");
|
|
|
|
dns = talloc_zero(task, struct dns_server);
|
|
if (dns == NULL) {
|
|
task_server_terminate(task, "dns: out of memory", true);
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
|
|
dns->task = task;
|
|
|
|
dns->server_credentials = cli_credentials_init(dns);
|
|
if (!dns->server_credentials) {
|
|
task_server_terminate(task, "Failed to init server credentials\n", true);
|
|
return NT_STATUS_UNSUCCESSFUL;
|
|
}
|
|
|
|
dns->samdb = samdb_connect(dns,
|
|
dns->task->event_ctx,
|
|
dns->task->lp_ctx,
|
|
system_session(dns->task->lp_ctx),
|
|
NULL,
|
|
0);
|
|
if (!dns->samdb) {
|
|
task_server_terminate(task, "dns: samdb_connect failed", true);
|
|
return NT_STATUS_UNSUCCESSFUL;
|
|
}
|
|
|
|
ok = cli_credentials_set_conf(dns->server_credentials, task->lp_ctx);
|
|
if (!ok) {
|
|
task_server_terminate(task,
|
|
"dns: failed to load smb.conf",
|
|
true);
|
|
return NT_STATUS_UNSUCCESSFUL;
|
|
}
|
|
|
|
hostname_lower = strlower_talloc(dns, lpcfg_netbios_name(task->lp_ctx));
|
|
dns_spn = talloc_asprintf(dns, "DNS/%s.%s",
|
|
hostname_lower,
|
|
lpcfg_dnsdomain(task->lp_ctx));
|
|
TALLOC_FREE(hostname_lower);
|
|
|
|
ret = dsdb_search_one(dns->samdb, dns, &dns_acc,
|
|
ldb_get_default_basedn(dns->samdb), LDB_SCOPE_SUBTREE,
|
|
attrs_none, 0, "(servicePrincipalName=%s)",
|
|
dns_spn);
|
|
if (ret == LDB_SUCCESS) {
|
|
TALLOC_FREE(dns_acc);
|
|
if (!dns_spn) {
|
|
task_server_terminate(task, "dns: talloc_asprintf failed", true);
|
|
return NT_STATUS_UNSUCCESSFUL;
|
|
}
|
|
status = cli_credentials_set_stored_principal(dns->server_credentials, task->lp_ctx, dns_spn);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
task_server_terminate(task,
|
|
talloc_asprintf(task, "Failed to obtain server credentials for DNS, "
|
|
"despite finding it in the samdb! %s\n",
|
|
nt_errstr(status)),
|
|
true);
|
|
return status;
|
|
}
|
|
} else {
|
|
TALLOC_FREE(dns_spn);
|
|
status = cli_credentials_set_machine_account(dns->server_credentials, task->lp_ctx);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
task_server_terminate(task,
|
|
talloc_asprintf(task, "Failed to obtain server credentials, perhaps a standalone server?: %s\n",
|
|
nt_errstr(status)),
|
|
true);
|
|
return status;
|
|
}
|
|
}
|
|
|
|
dns->tkeys = tkey_store_init(dns, TKEY_BUFFER_SIZE);
|
|
if (!dns->tkeys) {
|
|
task_server_terminate(task, "Failed to allocate tkey storage\n", true);
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
|
|
status = dns_server_reload_zones(dns);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
task_server_terminate(task, "dns: failed to load DNS zones", true);
|
|
return status;
|
|
}
|
|
|
|
status = dns_startup_interfaces(dns, ifaces, task->model_ops);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
task_server_terminate(task, "dns failed to setup interfaces", true);
|
|
return status;
|
|
}
|
|
|
|
/* Setup the IRPC interface and register handlers */
|
|
status = irpc_add_name(task->msg_ctx, "dnssrv");
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
task_server_terminate(task, "dns: failed to register IRPC name", true);
|
|
return status;
|
|
}
|
|
|
|
status = IRPC_REGISTER(task->msg_ctx, irpc, DNSSRV_RELOAD_DNS_ZONES,
|
|
dns_reload_zones, dns);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
task_server_terminate(task, "dns: failed to setup reload handler", true);
|
|
return status;
|
|
}
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
NTSTATUS server_service_dns_init(TALLOC_CTX *ctx)
|
|
{
|
|
static const struct service_details details = {
|
|
.inhibit_fork_on_accept = true,
|
|
.inhibit_pre_fork = true,
|
|
.task_init = dns_task_init,
|
|
.post_fork = NULL
|
|
};
|
|
return register_server_service(ctx, "dns", &details);
|
|
}
|