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/*
Unix SMB/CIFS implementation.
Utilities around tsocket
Copyright (C) Volker Lendecke 2009
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/tsocket/tsocket.h"
#include "../lib/util/tevent_unix.h"
struct tstream_read_packet_state {
struct tevent_context *ev;
struct tstream_context *stream;
ssize_t (*more)(uint8_t *buf, size_t buflen, void *private_data);
void *private_data;
uint8_t *buf;
struct iovec iov;
};
static void tstream_read_packet_done(struct tevent_req *subreq);
struct tevent_req *tstream_read_packet_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct tstream_context *stream,
size_t initial,
ssize_t (*more)(uint8_t *buf,
size_t buflen,
void *private_data),
void *private_data)
{
struct tevent_req *req, *subreq;
struct tstream_read_packet_state *state;
req = tevent_req_create(mem_ctx, &state,
struct tstream_read_packet_state);
if (req == NULL) {
return NULL;
}
state->buf = talloc_array(state, uint8_t, initial);
if (tevent_req_nomem(state->buf, req)) {
return tevent_req_post(req, ev);
}
state->iov.iov_base = (void *)state->buf;
state->iov.iov_len = initial;
state->ev = ev;
state->stream = stream;
state->more = more;
state->private_data = private_data;
subreq = tstream_readv_send(state, ev, stream, &state->iov, 1);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, tstream_read_packet_done, req);
return req;
}
static void tstream_read_packet_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct tstream_read_packet_state *state = tevent_req_data(
req, struct tstream_read_packet_state);
int ret, err;
size_t total;
ssize_t more;
uint8_t *tmp;
ret = tstream_readv_recv(subreq, &err);
TALLOC_FREE(subreq);
if (ret == 0) {
err = EPIPE;
}
if (ret <= 0) {
tevent_req_error(req, err);
return;
}
if (state->more == NULL) {
/* Nobody to ask, this is a async read_data */
tevent_req_done(req);
return;
}
total = talloc_array_length(state->buf);
more = state->more(state->buf, total, state->private_data);
if (more == -1) {
/* We got an invalid packet, tell the caller */
tevent_req_error(req, EIO);
return;
}
if (more == 0) {
/* We're done, full packet received */
tevent_req_done(req);
return;
}
if (total + more < total) {
tevent_req_error(req, EMSGSIZE);
return;
}
tmp = talloc_realloc(state, state->buf, uint8_t, total+more);
if (tevent_req_nomem(tmp, req)) {
return;
}
state->buf = tmp;
state->iov.iov_base = (void *)(state->buf + total);
state->iov.iov_len = more;
subreq = tstream_readv_send(state, state->ev, state->stream,
&state->iov, 1);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, tstream_read_packet_done, req);
}
ssize_t tstream_read_packet_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
uint8_t **pbuf, int *perrno)
{
struct tstream_read_packet_state *state =
tevent_req_data(req, struct tstream_read_packet_state);
if (tevent_req_is_unix_error(req, perrno)) {
return -1;
}
*pbuf = talloc_move(mem_ctx, &state->buf);
return talloc_array_length(*pbuf);
}
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