s3: Add async cli_session_request

This does not do the redirects, but I think that might be obsolete anyway
(cherry picked from commit e2296e23a8546e249d1b26f4da6277792923bef4)

2 files changed, 132 insertions, 0 deletions

diff --git a/source3/include/async_smb.h b/source3/include/async_smb.h
index 7fc4ff7d279..06e69591e1e 100644
--- a/source3/include/async_smb.h
+++ b/source3/include/async_smb.h
@@ -149,4 +149,11 @@ NTSTATUS cli_pull_error(char *buf);
 
 void cli_set_error(struct cli_state *cli, NTSTATUS status);
 
+struct tevent_req *cli_session_request_send(TALLOC_CTX *mem_ctx,
+					    struct tevent_context *ev,
+					    int sock,
+					    const struct nmb_name *called,
+					    const struct nmb_name *calling);
+bool cli_session_request_recv(struct tevent_req *req, int *err, uint8_t *resp);
+
 #endif
diff --git a/source3/libsmb/async_smb.c b/source3/libsmb/async_smb.c
index 17a8ca401fd..62a8c81c227 100644
--- a/source3/libsmb/async_smb.c
+++ b/source3/libsmb/async_smb.c
@@ -1222,3 +1222,128 @@ static void cli_state_handler(struct event_context *event_ctx,
 		cli->fd = -1;
 	}
 }
+
+
+struct cli_session_request_state {
+	struct tevent_context *ev;
+	int sock;
+	uint32 len_hdr;
+	struct iovec iov[3];
+	uint8_t nb_session_response;
+};
+
+static void cli_session_request_sent(struct tevent_req *subreq);
+static void cli_session_request_recvd(struct tevent_req *subreq);
+
+struct tevent_req *cli_session_request_send(TALLOC_CTX *mem_ctx,
+					    struct tevent_context *ev,
+					    int sock,
+					    const struct nmb_name *called,
+					    const struct nmb_name *calling)
+{
+	struct tevent_req *req, *subreq;
+	struct cli_session_request_state *state;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct cli_session_request_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->ev = ev;
+	state->sock = sock;
+
+	state->iov[1].iov_base = name_mangle(
+		state, called->name, called->name_type);
+	if (tevent_req_nomem(state->iov[1].iov_base, req)) {
+		return tevent_req_post(req, ev);
+	}
+	state->iov[1].iov_len = name_len(
+		(char *)state->iov[1].iov_base);
+
+	state->iov[2].iov_base = name_mangle(
+		state, calling->name, calling->name_type);
+	if (tevent_req_nomem(state->iov[2].iov_base, req)) {
+		return tevent_req_post(req, ev);
+	}
+	state->iov[2].iov_len = name_len(
+		(char *)state->iov[2].iov_base);
+
+	_smb_setlen(((char *)&state->len_hdr),
+		    state->iov[1].iov_len + state->iov[2].iov_len);
+	SCVAL((char *)&state->len_hdr, 0, 0x81);
+
+	state->iov[0].iov_base = &state->len_hdr;
+	state->iov[0].iov_len = sizeof(state->len_hdr);
+
+	subreq = writev_send(state, ev, NULL, sock, state->iov, 3);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, cli_session_request_sent, req);
+	return req;
+}
+
+static void cli_session_request_sent(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct cli_session_request_state *state = tevent_req_data(
+		req, struct cli_session_request_state);
+	ssize_t ret;
+	int err;
+
+	ret = writev_recv(subreq, &err);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+	subreq = read_smb_send(state, state->ev, state->sock);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, cli_session_request_recvd, req);
+}
+
+static void cli_session_request_recvd(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct cli_session_request_state *state = tevent_req_data(
+		req, struct cli_session_request_state);
+	uint8_t *buf;
+	ssize_t ret;
+	int err;
+
+	ret = read_smb_recv(subreq, talloc_tos(), &buf, &err);
+	TALLOC_FREE(subreq);
+
+	if (ret < 4) {
+		ret = -1;
+		err = EIO;
+	}
+	if (ret == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+	/*
+	 * In case of an error there is more information in the data
+	 * portion according to RFC1002. We're not subtle enough to
+	 * respond to the different error conditions, so drop the
+	 * error info here.
+	 */
+	state->nb_session_response = CVAL(buf, 0);
+	tevent_req_done(req);
+}
+
+bool cli_session_request_recv(struct tevent_req *req, int *err, uint8_t *resp)
+{
+	struct cli_session_request_state *state = tevent_req_data(
+		req, struct cli_session_request_state);
+
+	if (tevent_req_is_unix_error(req, err)) {
+		return false;
+	}
+	*resp = state->nb_session_response;
+	return true;
+}