mirror of
https://github.com/samba-team/samba.git
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373 lines
9.3 KiB
C
373 lines
9.3 KiB
C
/*
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Unix SMB/CIFS implementation.
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Samba3 message channels
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Copyright (C) Volker Lendecke 2012
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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 "msg_channel.h"
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#include "ctdb_conn.h"
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#include "lib/util/tevent_unix.h"
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struct msg_channel {
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struct ctdb_msg_channel *ctdb_channel;
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struct messaging_context *msg;
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uint32_t msg_type;
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struct tevent_req *pending_req;
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struct tevent_context *ev;
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struct messaging_rec **msgs;
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};
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struct msg_channel_init_state {
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struct msg_channel *channel;
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};
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static void msg_channel_init_got_ctdb(struct tevent_req *subreq);
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static void msg_channel_init_got_msg(struct messaging_context *msg,
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void *priv, uint32_t msg_type,
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struct server_id server_id, DATA_BLOB *data);
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static void msg_channel_trigger(struct tevent_context *ev,
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struct tevent_immediate *im,
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void *priv);
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static int msg_channel_init_destructor(struct msg_channel *s);
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struct tevent_req *msg_channel_init_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct messaging_context *msg,
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uint32_t msg_type)
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{
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struct tevent_req *req, *subreq;
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struct msg_channel_init_state *state;
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struct server_id pid;
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req = tevent_req_create(mem_ctx, &state,
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struct msg_channel_init_state);
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if (req == NULL) {
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return NULL;
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}
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state->channel = talloc_zero(state, struct msg_channel);
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if (tevent_req_nomem(state->channel, req)) {
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return tevent_req_post(req, ev);
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}
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state->channel->msg = msg;
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state->channel->msg_type = msg_type;
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pid = messaging_server_id(msg);
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subreq = ctdb_msg_channel_init_send(state, ev, lp_ctdbd_socket(),
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pid.pid);
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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, msg_channel_init_got_ctdb, req);
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return req;
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}
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static void msg_channel_init_got_ctdb(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 msg_channel_init_state *state = tevent_req_data(
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req, struct msg_channel_init_state);
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struct msg_channel *s = state->channel;
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NTSTATUS status;
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int ret;
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ret = ctdb_msg_channel_init_recv(subreq, s, &s->ctdb_channel);
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TALLOC_FREE(subreq);
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if (ret == ENOSYS) {
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s->ctdb_channel = NULL;
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ret = 0;
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}
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if (tevent_req_error(req, ret)) {
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return;
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}
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status = messaging_register(s->msg, s, s->msg_type,
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msg_channel_init_got_msg);
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if (!NT_STATUS_IS_OK(status)) {
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tevent_req_error(req, map_errno_from_nt_status(status));
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return;
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}
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talloc_set_destructor(s, msg_channel_init_destructor);
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tevent_req_done(req);
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}
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static int msg_channel_init_destructor(struct msg_channel *s)
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{
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messaging_deregister(s->msg, s->msg_type, s);
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return 0;
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}
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int msg_channel_init_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
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struct msg_channel **pchannel)
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{
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struct msg_channel_init_state *state = tevent_req_data(
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req, struct msg_channel_init_state);
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int err;
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if (tevent_req_is_unix_error(req, &err)) {
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return err;
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}
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*pchannel = talloc_move(mem_ctx, &state->channel);
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return 0;
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}
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int msg_channel_init(TALLOC_CTX *mem_ctx, struct messaging_context *msg,
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uint32_t msgtype, struct msg_channel **pchannel)
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{
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TALLOC_CTX *frame = talloc_stackframe();
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struct tevent_context *ev;
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struct tevent_req *req;
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int err = ENOMEM;
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bool ok;
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ev = tevent_context_init(frame);
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if (ev == NULL) {
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goto fail;
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}
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req = msg_channel_init_send(frame, ev, msg, msgtype);
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if (req == NULL) {
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goto fail;
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}
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ok = tevent_req_poll(req, ev);
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if (!ok) {
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err = errno;
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goto fail;
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}
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err = msg_channel_init_recv(req, mem_ctx, pchannel);
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fail:
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TALLOC_FREE(frame);
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return err;
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}
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static void msg_channel_init_got_msg(struct messaging_context *msg,
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void *priv, uint32_t msg_type,
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struct server_id server_id,
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DATA_BLOB *data)
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{
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struct msg_channel *s = talloc_get_type_abort(
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priv, struct msg_channel);
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struct messaging_rec *rec;
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struct messaging_rec **msgs;
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size_t num_msgs;
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struct tevent_immediate *im;
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rec = talloc(s, struct messaging_rec);
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if (rec == NULL) {
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goto fail;
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}
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rec->msg_version = 1;
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rec->msg_type = msg_type;
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rec->dest = server_id;
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rec->src = messaging_server_id(msg);
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rec->buf.data = (uint8_t *)talloc_memdup(rec, data->data,
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data->length);
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if (rec->buf.data == NULL) {
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goto fail;
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}
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rec->buf.length = data->length;
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num_msgs = talloc_array_length(s->msgs);
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msgs = talloc_realloc(s, s->msgs, struct messaging_rec *, num_msgs+1);
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if (msgs == NULL) {
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goto fail;
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}
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s->msgs = msgs;
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s->msgs[num_msgs] = talloc_move(s->msgs, &rec);
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if (s->pending_req == NULL) {
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return;
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}
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im = tevent_create_immediate(s->ev);
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if (im == NULL) {
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goto fail;
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}
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tevent_schedule_immediate(im, s->ev, msg_channel_trigger, s);
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return;
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fail:
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TALLOC_FREE(rec);
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}
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struct msg_read_state {
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struct tevent_context *ev;
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struct tevent_req *req;
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struct msg_channel *channel;
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struct messaging_rec *rec;
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};
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static int msg_read_state_destructor(struct msg_read_state *s);
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static void msg_read_got_ctdb(struct tevent_req *subreq);
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struct tevent_req *msg_read_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct msg_channel *channel)
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{
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struct tevent_req *req;
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struct tevent_immediate *im;
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struct msg_read_state *state;
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void *msg_tdb_event;
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size_t num_msgs;
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req = tevent_req_create(mem_ctx, &state, struct msg_read_state);
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if (req == NULL) {
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return NULL;
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}
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state->ev = ev;
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state->req = req;
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state->channel = channel;
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if (channel->pending_req != NULL) {
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tevent_req_error(req, EBUSY);
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return tevent_req_post(req, ev);
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}
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channel->pending_req = req;
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channel->ev = ev;
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talloc_set_destructor(state, msg_read_state_destructor);
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num_msgs = talloc_array_length(channel->msgs);
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if (num_msgs != 0) {
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im = tevent_create_immediate(channel->ev);
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if (tevent_req_nomem(im, req)) {
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return tevent_req_post(req, ev);
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}
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tevent_schedule_immediate(im, channel->ev, msg_channel_trigger,
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channel);
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return req;
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}
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msg_tdb_event = messaging_tdb_event(state, channel->msg, ev);
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if (tevent_req_nomem(msg_tdb_event, req)) {
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return tevent_req_post(req, ev);
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}
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if (channel->ctdb_channel != NULL) {
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struct tevent_req *subreq;
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subreq = ctdb_msg_read_send(state, ev,
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channel->ctdb_channel);
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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, msg_read_got_ctdb, req);
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}
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return req;
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}
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static int msg_read_state_destructor(struct msg_read_state *s)
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{
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assert(s->channel->pending_req == s->req);
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s->channel->pending_req = NULL;
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return 0;
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}
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static void msg_channel_trigger(struct tevent_context *ev,
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struct tevent_immediate *im,
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void *priv)
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{
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struct msg_channel *channel;
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struct tevent_req *req;
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struct msg_read_state *state;
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size_t num_msgs;
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channel = talloc_get_type_abort(priv, struct msg_channel);
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req = channel->pending_req;
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state = tevent_req_data(req, struct msg_read_state);
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talloc_set_destructor(state, NULL);
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msg_read_state_destructor(state);
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num_msgs = talloc_array_length(channel->msgs);
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assert(num_msgs > 0);
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state->rec = talloc_move(state, &channel->msgs[0]);
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memmove(channel->msgs, channel->msgs+1,
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sizeof(struct messaging_rec *) * (num_msgs-1));
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channel->msgs = talloc_realloc(
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channel, channel->msgs, struct messaging_rec *, num_msgs - 1);
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tevent_req_done(req);
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}
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static void msg_read_got_ctdb(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 msg_read_state *state = tevent_req_data(
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req, struct msg_read_state);
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DATA_BLOB blob;
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enum ndr_err_code ndr_err;
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int ret;
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ret = ctdb_msg_read_recv(subreq, talloc_tos(),
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&blob.data, &blob.length);
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TALLOC_FREE(subreq);
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if (tevent_req_error(req, ret)) {
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return;
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}
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state->rec = talloc(state, struct messaging_rec);
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if (tevent_req_nomem(state->rec, req)) {
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return;
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}
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ndr_err = ndr_pull_struct_blob(
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&blob, state->rec, state->rec,
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(ndr_pull_flags_fn_t)ndr_pull_messaging_rec);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DEBUG(1, ("ndr_pull_struct_blob failed: %s\n",
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ndr_errstr(ndr_err)));
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tevent_req_error(req, ndr_map_error2errno(ndr_err));
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return;
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}
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if (DEBUGLEVEL >= 10) {
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NDR_PRINT_DEBUG(messaging_rec, state->rec);
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}
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if (state->rec->msg_type == state->channel->msg_type) {
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tevent_req_done(req);
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return;
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}
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/*
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* Got some unexpected msg type, wait for the next one
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*/
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subreq = ctdb_msg_read_send(state, state->ev,
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state->channel->ctdb_channel);
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if (tevent_req_nomem(subreq, req)) {
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return;
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}
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tevent_req_set_callback(subreq, msg_read_got_ctdb, req);
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}
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int msg_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
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struct messaging_rec **prec)
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{
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struct msg_read_state *state = tevent_req_data(
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req, struct msg_read_state);
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int err;
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if (tevent_req_is_unix_error(req, &err)) {
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return err;
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}
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*prec = talloc_move(mem_ctx, &state->rec);
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return 0;
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}
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