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samba-mirror/source4/wrepl_server/wrepl_in_connection.c
Stefan Metzmacher d6c48b4a5f s4:wrepl_server: use SOCKET_FLAG_NOCLOSE instead of a dup()
The key thing is that we might have to turn the incomming
connection into a outgoing connection.

This change makes sense anyway, because we donate the fd to
tstream.

metze
2010-09-28 03:48:10 +02:00

481 lines
14 KiB
C

/*
Unix SMB/CIFS implementation.
WINS Replication server
Copyright (C) Stefan Metzmacher 2005
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 "lib/socket/socket.h"
#include "lib/stream/packet.h"
#include "smbd/service_task.h"
#include "smbd/service_stream.h"
#include "smbd/service.h"
#include "lib/messaging/irpc.h"
#include "librpc/gen_ndr/ndr_winsrepl.h"
#include "wrepl_server/wrepl_server.h"
#include "smbd/process_model.h"
#include "system/network.h"
#include "lib/socket/netif.h"
#include "lib/tsocket/tsocket.h"
#include "libcli/util/tstream.h"
#include "param/param.h"
void wreplsrv_terminate_in_connection(struct wreplsrv_in_connection *wreplconn, const char *reason)
{
stream_terminate_connection(wreplconn->conn, reason);
}
/*
receive some data on a WREPL connection
*/
static NTSTATUS wreplsrv_process(struct wreplsrv_in_connection *wrepl_conn,
struct wreplsrv_in_call **_call)
{
struct wrepl_wrap packet_out_wrap;
NTSTATUS status;
enum ndr_err_code ndr_err;
struct wreplsrv_in_call *call = *_call;
ndr_err = ndr_pull_struct_blob(&call->in, call,
&call->req_packet,
(ndr_pull_flags_fn_t)ndr_pull_wrepl_packet);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return ndr_map_error2ntstatus(ndr_err);
}
if (DEBUGLVL(10)) {
DEBUG(10,("Received WINS-Replication packet of length %u\n",
(unsigned int) call->in.length + 4));
NDR_PRINT_DEBUG(wrepl_packet, &call->req_packet);
}
status = wreplsrv_in_call(call);
NT_STATUS_IS_ERR_RETURN(status);
if (!NT_STATUS_IS_OK(status)) {
/* w2k just ignores invalid packets, so we do */
DEBUG(10,("Received WINS-Replication packet was invalid, we just ignore it\n"));
TALLOC_FREE(call);
*_call = NULL;
return NT_STATUS_OK;
}
/* and now encode the reply */
packet_out_wrap.packet = call->rep_packet;
ndr_err = ndr_push_struct_blob(&call->out, call,
&packet_out_wrap,
(ndr_push_flags_fn_t) ndr_push_wrepl_wrap);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return ndr_map_error2ntstatus(ndr_err);
}
if (DEBUGLVL(10)) {
DEBUG(10,("Sending WINS-Replication packet of length %u\n",
(unsigned int) call->out.length));
NDR_PRINT_DEBUG(wrepl_packet, &call->rep_packet);
}
return NT_STATUS_OK;
}
static void wreplsrv_call_loop(struct tevent_req *subreq);
/*
called when we get a new connection
*/
static void wreplsrv_accept(struct stream_connection *conn)
{
struct wreplsrv_service *service = talloc_get_type(conn->private_data, struct wreplsrv_service);
struct wreplsrv_in_connection *wrepl_conn;
struct tsocket_address *peer_addr;
char *peer_ip;
struct tevent_req *subreq;
int rc;
wrepl_conn = talloc_zero(conn, struct wreplsrv_in_connection);
if (wrepl_conn == NULL) {
stream_terminate_connection(conn,
"wreplsrv_accept: out of memory");
return;
}
wrepl_conn->send_queue = tevent_queue_create(conn, "wrepl_accept");
if (wrepl_conn->send_queue == NULL) {
stream_terminate_connection(conn,
"wrepl_accept: out of memory");
return;
}
TALLOC_FREE(conn->event.fde);
rc = tstream_bsd_existing_socket(wrepl_conn,
socket_get_fd(conn->socket),
&wrepl_conn->tstream);
if (rc < 0) {
stream_terminate_connection(conn,
"wrepl_accept: out of memory");
return;
}
socket_set_flags(conn->socket, SOCKET_FLAG_NOCLOSE);
wrepl_conn->conn = conn;
wrepl_conn->service = service;
peer_addr = conn->remote_address;
if (!tsocket_address_is_inet(peer_addr, "ipv4")) {
DEBUG(0,("wreplsrv_accept: non ipv4 peer addr '%s'\n",
tsocket_address_string(peer_addr, wrepl_conn)));
wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_accept: "
"invalid peer IP");
return;
}
peer_ip = tsocket_address_inet_addr_string(peer_addr, wrepl_conn);
if (peer_ip == NULL) {
wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_accept: "
"could not convert peer IP into a string");
return;
}
wrepl_conn->partner = wreplsrv_find_partner(service, peer_ip);
irpc_add_name(conn->msg_ctx, "wreplsrv_connection");
/*
* The wrepl pdu's has the length as 4 byte (initial_read_size),
* packet_full_request_u32 provides the pdu length then.
*/
subreq = tstream_read_pdu_blob_send(wrepl_conn,
wrepl_conn->conn->event.ctx,
wrepl_conn->tstream,
4, /* initial_read_size */
packet_full_request_u32,
wrepl_conn);
if (subreq == NULL) {
wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_accept: "
"no memory for tstream_read_pdu_blob_send");
return;
}
tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_conn);
}
static void wreplsrv_call_writev_done(struct tevent_req *subreq);
static void wreplsrv_call_loop(struct tevent_req *subreq)
{
struct wreplsrv_in_connection *wrepl_conn = tevent_req_callback_data(subreq,
struct wreplsrv_in_connection);
struct wreplsrv_in_call *call;
NTSTATUS status;
call = talloc_zero(wrepl_conn, struct wreplsrv_in_call);
if (call == NULL) {
wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
"no memory for wrepl_samba3_call");
return;
}
call->wreplconn = wrepl_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, "wreplsrv_call_loop: "
"tstream_read_pdu_blob_recv() - %s",
nt_errstr(status));
if (!reason) {
reason = nt_errstr(status);
}
wreplsrv_terminate_in_connection(wrepl_conn, reason);
return;
}
DEBUG(10,("Received wrepl packet of length %lu from %s\n",
(long) call->in.length,
tsocket_address_string(wrepl_conn->conn->remote_address, call)));
/* skip length header */
call->in.data += 4;
call->in.length -= 4;
status = wreplsrv_process(wrepl_conn, &call);
if (!NT_STATUS_IS_OK(status)) {
const char *reason;
reason = talloc_asprintf(call, "wreplsrv_call_loop: "
"tstream_read_pdu_blob_recv() - %s",
nt_errstr(status));
if (reason == NULL) {
reason = nt_errstr(status);
}
wreplsrv_terminate_in_connection(wrepl_conn, reason);
return;
}
/* We handed over the connection so we're done here */
if (wrepl_conn->tstream == NULL) {
return;
}
/* Invalid WINS-Replication packet, we just ignore it */
if (call == NULL) {
goto noreply;
}
call->out_iov[0].iov_base = call->out.data;
call->out_iov[0].iov_len = call->out.length;
subreq = tstream_writev_queue_send(call,
wrepl_conn->conn->event.ctx,
wrepl_conn->tstream,
wrepl_conn->send_queue,
call->out_iov, 1);
if (subreq == NULL) {
wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
"no memory for tstream_writev_queue_send");
return;
}
tevent_req_set_callback(subreq, wreplsrv_call_writev_done, call);
noreply:
/*
* The wrepl pdu's has the length as 4 byte (initial_read_size),
* provides the pdu length then.
*/
subreq = tstream_read_pdu_blob_send(wrepl_conn,
wrepl_conn->conn->event.ctx,
wrepl_conn->tstream,
4, /* initial_read_size */
packet_full_request_u32,
wrepl_conn);
if (subreq == NULL) {
wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
"no memory for tstream_read_pdu_blob_send");
return;
}
tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_conn);
}
static void wreplsrv_call_writev_done(struct tevent_req *subreq)
{
struct wreplsrv_in_call *call = tevent_req_callback_data(subreq,
struct wreplsrv_in_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, "wreplsrv_call_writev_done: "
"tstream_writev_queue_recv() - %d:%s",
sys_errno, strerror(sys_errno));
if (reason == NULL) {
reason = "wreplsrv_call_writev_done: "
"tstream_writev_queue_recv() failed";
}
wreplsrv_terminate_in_connection(call->wreplconn, reason);
return;
}
if (call->terminate_after_send) {
wreplsrv_terminate_in_connection(call->wreplconn,
"wreplsrv_in_connection: terminate_after_send");
return;
}
talloc_free(call);
}
/*
called on a tcp recv
*/
static void wreplsrv_recv(struct stream_connection *conn, uint16_t flags)
{
struct wreplsrv_in_connection *wrepl_conn = talloc_get_type(conn->private_data,
struct wreplsrv_in_connection);
/* this should never be triggered! */
DEBUG(0,("Terminating connection - '%s'\n", "wrepl_recv: called"));
wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_recv: called");
}
/*
called when we can write to a connection
*/
static void wreplsrv_send(struct stream_connection *conn, uint16_t flags)
{
struct wreplsrv_in_connection *wrepl_conn = talloc_get_type(conn->private_data,
struct wreplsrv_in_connection);
/* this should never be triggered! */
DEBUG(0,("Terminating connection - '%s'\n", "wrepl_send: called"));
wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_send: called");
}
static const struct stream_server_ops wreplsrv_stream_ops = {
.name = "wreplsrv",
.accept_connection = wreplsrv_accept,
.recv_handler = wreplsrv_recv,
.send_handler = wreplsrv_send,
};
/*
called when we get a new connection
*/
NTSTATUS wreplsrv_in_connection_merge(struct wreplsrv_partner *partner,
uint32_t peer_assoc_ctx,
struct tstream_context **stream,
struct wreplsrv_in_connection **_wrepl_in)
{
struct wreplsrv_service *service = partner->service;
struct wreplsrv_in_connection *wrepl_in;
const struct model_ops *model_ops;
struct stream_connection *conn;
struct tevent_req *subreq;
NTSTATUS status;
/* within the wrepl 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(service->task->event_ctx, "single");
if (!model_ops) {
DEBUG(0,("Can't find 'single' process model_ops"));
return NT_STATUS_INTERNAL_ERROR;
}
wrepl_in = talloc_zero(partner, struct wreplsrv_in_connection);
NT_STATUS_HAVE_NO_MEMORY(wrepl_in);
wrepl_in->service = service;
wrepl_in->partner = partner;
wrepl_in->tstream = talloc_move(wrepl_in, stream);
wrepl_in->assoc_ctx.peer_ctx = peer_assoc_ctx;
status = stream_new_connection_merge(service->task->event_ctx,
service->task->lp_ctx,
model_ops,
&wreplsrv_stream_ops,
service->task->msg_ctx,
wrepl_in,
&conn);
NT_STATUS_NOT_OK_RETURN(status);
/*
* make the wreplsrv_in_connection structure a child of the
* stream_connection, to match the hierarchy of wreplsrv_accept
*/
wrepl_in->conn = conn;
talloc_steal(conn, wrepl_in);
wrepl_in->send_queue = tevent_queue_create(wrepl_in, "wreplsrv_in_connection_merge");
if (wrepl_in->send_queue == NULL) {
stream_terminate_connection(conn,
"wreplsrv_in_connection_merge: out of memory");
return NT_STATUS_NO_MEMORY;
}
/*
* The wrepl pdu's has the length as 4 byte (initial_read_size),
* packet_full_request_u32 provides the pdu length then.
*/
subreq = tstream_read_pdu_blob_send(wrepl_in,
wrepl_in->conn->event.ctx,
wrepl_in->tstream,
4, /* initial_read_size */
packet_full_request_u32,
wrepl_in);
if (subreq == NULL) {
wreplsrv_terminate_in_connection(wrepl_in, "wreplsrv_in_connection_merge: "
"no memory for tstream_read_pdu_blob_send");
return NT_STATUS_NO_MEMORY;
}
tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_in);
*_wrepl_in = wrepl_in;
return NT_STATUS_OK;
}
/*
startup the wrepl port 42 server sockets
*/
NTSTATUS wreplsrv_setup_sockets(struct wreplsrv_service *service, struct loadparm_context *lp_ctx)
{
NTSTATUS status;
struct task_server *task = service->task;
const struct model_ops *model_ops;
const char *address;
uint16_t port = WINS_REPLICATION_PORT;
/* within the wrepl 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(task->event_ctx, "single");
if (!model_ops) {
DEBUG(0,("Can't find 'single' process model_ops"));
return NT_STATUS_INTERNAL_ERROR;
}
if (lpcfg_interfaces(lp_ctx) && lpcfg_bind_interfaces_only(lp_ctx)) {
int num_interfaces;
int i;
struct interface *ifaces;
load_interfaces(task, lpcfg_interfaces(lp_ctx), &ifaces);
num_interfaces = iface_count(ifaces);
/* We have been given an interfaces line, and been
told to only bind to those interfaces. Create a
socket per interface and bind to only these.
*/
for(i = 0; i < num_interfaces; i++) {
address = iface_n_ip(ifaces, i);
status = stream_setup_socket(task->event_ctx,
task->lp_ctx, model_ops,
&wreplsrv_stream_ops,
"ipv4", address, &port,
lpcfg_socket_options(task->lp_ctx),
service);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
address, port, nt_errstr(status)));
return status;
}
}
} else {
address = lpcfg_socket_address(lp_ctx);
status = stream_setup_socket(task->event_ctx, task->lp_ctx,
model_ops, &wreplsrv_stream_ops,
"ipv4", address, &port, lpcfg_socket_options(task->lp_ctx),
service);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
address, port, nt_errstr(status)));
return status;
}
}
return NT_STATUS_OK;
}