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samba-mirror/source4/dns_server/dns_server.c
Kai Blin 558fa4c45a s4 dns: Revert erroneous push from wrong branch
I've pushed the wrong branch for this, sorry about that.

Autobuild-User(master): Kai Blin <kai@samba.org>
Autobuild-Date(master): Wed Sep  5 14:10:54 CEST 2012 on sn-devel-104
2012-09-05 14:10:54 +02:00

811 lines
21 KiB
C

/*
Unix SMB/CIFS implementation.
DNS server startup
Copyright (C) 2010 Kai Blin <kai@samba.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "smbd/service_task.h"
#include "smbd/service.h"
#include "smbd/service_stream.h"
#include "smbd/process_model.h"
#include "lib/events/events.h"
#include "lib/socket/socket.h"
#include "lib/tsocket/tsocket.h"
#include "libcli/util/tstream.h"
#include "libcli/util/ntstatus.h"
#include "system/network.h"
#include "lib/stream/packet.h"
#include "lib/socket/netif.h"
#include "dns_server/dns_server.h"
#include "param/param.h"
#include "librpc/ndr/libndr.h"
#include "librpc/gen_ndr/ndr_dns.h"
#include "librpc/gen_ndr/ndr_dnsp.h"
#include <ldb.h>
#include "dsdb/samdb/samdb.h"
#include "dsdb/common/util.h"
#include "auth/session.h"
#include "lib/util/dlinklist.h"
#include "lib/util/tevent_werror.h"
#include "auth/auth.h"
#include "auth/credentials/credentials.h"
NTSTATUS server_service_dns_init(void);
/* hold information about one dns socket */
struct dns_socket {
struct dns_server *dns;
struct tsocket_address *local_address;
};
struct dns_udp_socket {
struct dns_socket *dns_socket;
struct tdgram_context *dgram;
struct tevent_queue *send_queue;
};
/*
state of an open tcp connection
*/
struct dns_tcp_connection {
/* stream connection we belong to */
struct stream_connection *conn;
/* the dns_server the connection belongs to */
struct dns_socket *dns_socket;
struct tstream_context *tstream;
struct tevent_queue *send_queue;
};
static void dns_tcp_terminate_connection(struct dns_tcp_connection *dnsconn, const char *reason)
{
stream_terminate_connection(dnsconn->conn, reason);
}
static void dns_tcp_recv(struct stream_connection *conn, uint16_t flags)
{
struct dns_tcp_connection *dnsconn = talloc_get_type(conn->private_data,
struct dns_tcp_connection);
/* this should never be triggered! */
dns_tcp_terminate_connection(dnsconn, "dns_tcp_recv: called");
}
static void dns_tcp_send(struct stream_connection *conn, uint16_t flags)
{
struct dns_tcp_connection *dnsconn = talloc_get_type(conn->private_data,
struct dns_tcp_connection);
/* this should never be triggered! */
dns_tcp_terminate_connection(dnsconn, "dns_tcp_send: called");
}
struct dns_process_state {
DATA_BLOB *in;
struct dns_name_packet in_packet;
struct dns_request_state state;
uint16_t dns_err;
struct dns_name_packet out_packet;
DATA_BLOB out;
};
static void dns_process_done(struct tevent_req *subreq);
static struct tevent_req *dns_process_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct dns_server *dns,
DATA_BLOB *in)
{
struct tevent_req *req, *subreq;
struct dns_process_state *state;
enum ndr_err_code ndr_err;
WERROR ret;
req = tevent_req_create(mem_ctx, &state, struct dns_process_state);
if (req == NULL) {
return NULL;
}
state->in = in;
if (in->length < 12) {
tevent_req_werror(req, WERR_INVALID_PARAM);
return tevent_req_post(req, ev);
}
dump_data(8, in->data, in->length);
ndr_err = ndr_pull_struct_blob(
in, state, &state->in_packet,
(ndr_pull_flags_fn_t)ndr_pull_dns_name_packet);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
state->dns_err = DNS_RCODE_FORMERR;
tevent_req_done(req);
return tevent_req_post(req, ev);
}
if (DEBUGLVL(8)) {
NDR_PRINT_DEBUG(dns_name_packet, &state->in_packet);
}
state->state.flags = state->in_packet.operation;
state->state.flags |= DNS_FLAG_REPLY;
if (lpcfg_dns_recursive_queries(dns->task->lp_ctx)) {
state->state.flags |= DNS_FLAG_RECURSION_AVAIL;
}
state->out_packet = state->in_packet;
switch (state->in_packet.operation & DNS_OPCODE) {
case DNS_OPCODE_QUERY:
subreq = dns_server_process_query_send(
state, ev, dns, &state->state, &state->in_packet);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, dns_process_done, req);
return req;
case DNS_OPCODE_UPDATE:
ret = dns_server_process_update(
dns, &state->state, state, &state->in_packet,
&state->out_packet.answers, &state->out_packet.ancount,
&state->out_packet.nsrecs, &state->out_packet.nscount,
&state->out_packet.additional,
&state->out_packet.arcount);
break;
default:
ret = WERR_DNS_ERROR_RCODE_NOT_IMPLEMENTED;
}
if (!W_ERROR_IS_OK(ret)) {
state->dns_err = werr_to_dns_err(ret);
}
tevent_req_done(req);
return tevent_req_post(req, ev);
}
static void dns_process_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct dns_process_state *state = tevent_req_data(
req, struct dns_process_state);
WERROR ret;
ret = dns_server_process_query_recv(
subreq, state,
&state->out_packet.answers, &state->out_packet.ancount,
&state->out_packet.nsrecs, &state->out_packet.nscount,
&state->out_packet.additional, &state->out_packet.arcount);
TALLOC_FREE(subreq);
if (!W_ERROR_IS_OK(ret)) {
state->dns_err = werr_to_dns_err(ret);
}
tevent_req_done(req);
}
static WERROR dns_process_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
DATA_BLOB *out)
{
struct dns_process_state *state = tevent_req_data(
req, struct dns_process_state);
enum ndr_err_code ndr_err;
WERROR ret;
if (tevent_req_is_werror(req, &ret)) {
return ret;
}
if (state->dns_err != DNS_RCODE_OK) {
goto drop;
}
state->out_packet.operation |= state->state.flags;
ndr_err = ndr_push_struct_blob(
out, mem_ctx, &state->out_packet,
(ndr_push_flags_fn_t)ndr_push_dns_name_packet);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
DEBUG(1, ("Failed to push packet: %s!\n",
ndr_errstr(ndr_err)));
state->dns_err = DNS_RCODE_SERVFAIL;
goto drop;
}
return WERR_OK;
drop:
*out = data_blob_talloc(mem_ctx, state->in->data, state->in->length);
if (out->data == NULL) {
return WERR_NOMEM;
}
out->data[2] |= 0x80; /* Toggle DNS_FLAG_REPLY */
out->data[3] |= state->dns_err;
return WERR_OK;
}
struct dns_tcp_call {
struct dns_tcp_connection *dns_conn;
DATA_BLOB in;
DATA_BLOB out;
uint8_t out_hdr[4];
struct iovec out_iov[2];
};
static void dns_tcp_call_process_done(struct tevent_req *subreq);
static void dns_tcp_call_writev_done(struct tevent_req *subreq);
static void dns_tcp_call_loop(struct tevent_req *subreq)
{
struct dns_tcp_connection *dns_conn = tevent_req_callback_data(subreq,
struct dns_tcp_connection);
struct dns_server *dns = dns_conn->dns_socket->dns;
struct dns_tcp_call *call;
NTSTATUS status;
call = talloc(dns_conn, struct dns_tcp_call);
if (call == NULL) {
dns_tcp_terminate_connection(dns_conn, "dns_tcp_call_loop: "
"no memory for dns_tcp_call");
return;
}
call->dns_conn = dns_conn;
status = tstream_read_pdu_blob_recv(subreq,
call,
&call->in);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
const char *reason;
reason = talloc_asprintf(call, "dns_tcp_call_loop: "
"tstream_read_pdu_blob_recv() - %s",
nt_errstr(status));
if (!reason) {
reason = nt_errstr(status);
}
dns_tcp_terminate_connection(dns_conn, reason);
return;
}
DEBUG(10,("Received DNS TCP packet of length %lu from %s\n",
(long) call->in.length,
tsocket_address_string(dns_conn->conn->remote_address, call)));
/* skip length header */
call->in.data += 2;
call->in.length -= 2;
subreq = dns_process_send(call, dns->task->event_ctx, dns,
&call->in);
if (subreq == NULL) {
dns_tcp_terminate_connection(
dns_conn, "dns_tcp_call_loop: dns_process_send "
"failed\n");
return;
}
tevent_req_set_callback(subreq, dns_tcp_call_process_done, call);
/*
* 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_call_loop: "
"no memory for tstream_read_pdu_blob_send");
return;
}
tevent_req_set_callback(subreq, dns_tcp_call_loop, dns_conn);
}
static void dns_tcp_call_process_done(struct tevent_req *subreq)
{
struct dns_tcp_call *call = tevent_req_callback_data(subreq,
struct dns_tcp_call);
struct dns_tcp_connection *dns_conn = call->dns_conn;
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)));
dns_tcp_terminate_connection(dns_conn,
"dns_tcp_call_loop: process function failed");
return;
}
/* First add the length of the out buffer */
RSSVAL(call->out_hdr, 0, call->out.length);
call->out_iov[0].iov_base = (char *) call->out_hdr;
call->out_iov[0].iov_len = 2;
call->out_iov[1].iov_base = (char *) call->out.data;
call->out_iov[1].iov_len = call->out.length;
subreq = tstream_writev_queue_send(call,
dns_conn->conn->event.ctx,
dns_conn->tstream,
dns_conn->send_queue,
call->out_iov, 2);
if (subreq == NULL) {
dns_tcp_terminate_connection(dns_conn, "dns_tcp_call_loop: "
"no memory for tstream_writev_queue_send");
return;
}
tevent_req_set_callback(subreq, dns_tcp_call_writev_done, call);
}
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;
int rc;
rc = tstream_writev_queue_recv(subreq, &sys_errno);
TALLOC_FREE(subreq);
if (rc == -1) {
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->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);
ssize_t ret;
int sys_errno;
ret = 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);
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 loadparm_context *lp_ctx,
struct interface *ifaces)
{
const struct model_ops *model_ops;
int num_interfaces;
TALLOC_CTX *tmp_ctx = talloc_new(dns);
NTSTATUS status;
int i;
/* within the dns task we want to be a single process, so
ask for the single process model ops and pass these to the
stream_setup_socket() call. */
model_ops = process_model_startup("single");
if (!model_ops) {
DEBUG(0,("Can't find 'single' process model_ops\n"));
return NT_STATUS_INTERNAL_ERROR;
}
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, DNS_SERVICE_PORT);
NT_STATUS_NOT_OK_RETURN(status);
}
talloc_free(tmp_ctx);
return NT_STATUS_OK;
}
static int dns_server_sort_zones(struct ldb_message **m1, struct ldb_message **m2)
{
const char *n1, *n2;
size_t l1, l2;
n1 = ldb_msg_find_attr_as_string(*m1, "name", NULL);
n2 = ldb_msg_find_attr_as_string(*m2, "name", NULL);
l1 = strlen(n1);
l2 = strlen(n2);
/* If the string lengths are not equal just sort by length */
if (l1 != l2) {
/* If m1 is the larger zone name, return it first */
return l2 - l1;
}
/*TODO: We need to compare DNs here, we want the DomainDNSZones first */
return 0;
}
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 void dns_task_init(struct task_server *task)
{
struct dns_server *dns;
NTSTATUS status;
struct interface *ifaces;
int ret;
struct ldb_result *res;
static const char * const attrs[] = { "name", NULL};
unsigned int i;
switch (lpcfg_server_role(task->lp_ctx)) {
case ROLE_STANDALONE:
task_server_terminate(task, "dns: no DNS required in standalone configuration", false);
return;
case ROLE_DOMAIN_MEMBER:
task_server_terminate(task, "dns: no DNS required in member server configuration", false);
return;
case ROLE_ACTIVE_DIRECTORY_DC:
/* Yes, we want a DNS */
break;
}
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;
}
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;
}
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;
}
cli_credentials_set_conf(dns->server_credentials, task->lp_ctx);
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;
}
dns->tkeys = tkey_store_init(dns, TKEY_BUFFER_SIZE);
if (!dns->tkeys) {
task_server_terminate(task, "Failed to allocate tkey storage\n", true);
return;
}
dns->samdb = samdb_connect(dns, dns->task->event_ctx, dns->task->lp_ctx,
system_session(dns->task->lp_ctx), 0);
if (!dns->samdb) {
task_server_terminate(task, "dns: samdb_connect failed", true);
return;
}
// TODO: this search does not work against windows
ret = dsdb_search(dns->samdb, dns, &res, NULL, LDB_SCOPE_SUBTREE,
attrs, DSDB_SEARCH_SEARCH_ALL_PARTITIONS, "(objectClass=dnsZone)");
if (ret != LDB_SUCCESS) {
task_server_terminate(task,
"dns: failed to look up root DNS zones",
true);
return;
}
TYPESAFE_QSORT(res->msgs, res->count, dns_server_sort_zones);
for (i=0; i < res->count; i++) {
struct dns_server_zone *z;
z = talloc_zero(dns, struct dns_server_zone);
if (z == NULL) {
}
z->name = ldb_msg_find_attr_as_string(res->msgs[i], "name", NULL);
z->dn = talloc_move(z, &res->msgs[i]->dn);
DLIST_ADD_END(dns->zones, z, NULL);
}
status = dns_startup_interfaces(dns, task->lp_ctx, ifaces);
if (!NT_STATUS_IS_OK(status)) {
task_server_terminate(task, "dns failed to setup interfaces", true);
return;
}
}
NTSTATUS server_service_dns_init(void)
{
return register_server_service("dns", dns_task_init);
}