Add tstream_read_packet

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 00000000000..75888574043
--- /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);
+}