summaryrefslogtreecommitdiff
path: root/source3/libsmb/read_smb.c
diff options
context:
space:
mode:
Diffstat (limited to 'source3/libsmb/read_smb.c')
-rw-r--r--source3/libsmb/read_smb.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/source3/libsmb/read_smb.c b/source3/libsmb/read_smb.c
new file mode 100644
index 0000000000..f530633c9f
--- /dev/null
+++ b/source3/libsmb/read_smb.c
@@ -0,0 +1,134 @@
+/*
+ Unix SMB/CIFS implementation.
+ Infrastructure for async SMB client requests
+ Copyright (C) Volker Lendecke 2008
+
+ 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/async_req/async_sock.h"
+#include "read_smb.h"
+#include "lib/util/tevent_unix.h"
+
+/*
+ * Read an smb packet asynchronously, discard keepalives
+ */
+
+struct read_smb_state {
+ struct tevent_context *ev;
+ int fd;
+ uint8_t *buf;
+};
+
+static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data);
+static void read_smb_done(struct tevent_req *subreq);
+
+struct tevent_req *read_smb_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ int fd)
+{
+ struct tevent_req *result, *subreq;
+ struct read_smb_state *state;
+
+ result = tevent_req_create(mem_ctx, &state, struct read_smb_state);
+ if (result == NULL) {
+ return NULL;
+ }
+ state->ev = ev;
+ state->fd = fd;
+
+ subreq = read_packet_send(state, ev, fd, 4, read_smb_more, NULL);
+ if (subreq == NULL) {
+ goto fail;
+ }
+ tevent_req_set_callback(subreq, read_smb_done, result);
+ return result;
+ fail:
+ TALLOC_FREE(result);
+ return NULL;
+}
+
+static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data)
+{
+ if (buflen > 4) {
+ return 0; /* We've been here, we're done */
+ }
+ return smb_len_large(buf);
+}
+
+static void read_smb_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct read_smb_state *state = tevent_req_data(
+ req, struct read_smb_state);
+ ssize_t len;
+ int err;
+
+ len = read_packet_recv(subreq, state, &state->buf, &err);
+ TALLOC_FREE(subreq);
+ if (len == -1) {
+ tevent_req_error(req, err);
+ return;
+ }
+
+ if (CVAL(state->buf, 0) == SMBkeepalive) {
+ subreq = read_packet_send(state, state->ev, state->fd, 4,
+ read_smb_more, NULL);
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq, read_smb_done, req);
+ return;
+ }
+ tevent_req_done(req);
+}
+
+ssize_t read_smb_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+ uint8_t **pbuf, int *perrno)
+{
+ struct read_smb_state *state = tevent_req_data(
+ req, struct read_smb_state);
+
+ if (tevent_req_is_unix_error(req, perrno)) {
+ return -1;
+ }
+ *pbuf = talloc_move(mem_ctx, &state->buf);
+ return talloc_get_size(*pbuf);
+}
+
+ssize_t read_smb(int fd, TALLOC_CTX *mem_ctx, uint8_t **pbuf, int *perrno)
+{
+ TALLOC_CTX *frame = talloc_stackframe();
+ struct event_context *ev;
+ struct tevent_req *req;
+ ssize_t ret = -1;
+
+ ev = event_context_init(frame);
+ if (ev == NULL) {
+ goto fail;
+ }
+ req = read_smb_send(frame, ev, fd);
+ if (req == NULL) {
+ goto fail;
+ }
+ if (!tevent_req_poll(req, ev)) {
+ goto fail;
+ }
+ ret = read_smb_recv(req, mem_ctx, pbuf, perrno);
+ fail:
+ TALLOC_FREE(frame);
+ return ret;
+}