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authorVolker Lendecke <vl@samba.org>2009-06-27 17:21:19 +0200
committerVolker Lendecke <vl@samba.org>2009-06-27 23:17:49 +0200
commit55dae4469c1c2ba571bfaeb93de7494480e0d72b (patch)
tree7015b2b309a6863879a55b3b18334c8e97c05947 /source3/lib
parentc687eb15d953006f1de1e02abad40365040a29f1 (diff)
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Add tstream_read_packet
Diffstat (limited to 'source3/lib')
-rw-r--r--source3/lib/util_tsock.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/source3/lib/util_tsock.c b/source3/lib/util_tsock.c
new file mode 100644
index 0000000000..7588857404
--- /dev/null
+++ b/source3/lib/util_tsock.c
@@ -0,0 +1,139 @@
+/*
+ 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"
+
+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 = 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;
+ }
+
+ tmp = talloc_realloc(state, state->buf, uint8_t, total+more);
+ if (tevent_req_nomem(tmp, req)) {
+ return;
+ }
+ state->buf = tmp;
+
+ state->iov.iov_base = 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);
+}