s3-rpc_client: Added a tstream based transport.

Signed-off-by: Andreas Schneider <asn@cynapses.org>

1 files changed, 361 insertions, 0 deletions

diff --git a/source3/rpc_client/rpc_transport_tstream.c b/source3/rpc_client/rpc_transport_tstream.c
new file mode 100644
index 0000000000..c62540cb3f
--- /dev/null
+++ b/source3/rpc_client/rpc_transport_tstream.c
@@ -0,0 +1,361 @@
+/*
+ *  Unix SMB/CIFS implementation.
+ *  RPC client transport over tstream
+ *  Copyright (C) Simo Sorce 2010
+ *
+ *  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"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_RPC_CLI
+
+struct rpc_tstream_state {
+	struct tstream_context *stream;
+	struct tevent_queue *read_queue;
+	struct tevent_queue *write_queue;
+	int timeout;
+};
+
+static void rpc_tstream_disconnect(struct rpc_tstream_state *s)
+{
+	TALLOC_FREE(s->stream);
+}
+
+static bool rpc_tstream_is_connected(void *priv)
+{
+	struct rpc_tstream_state *transp =
+		talloc_get_type_abort(priv, struct rpc_tstream_state);
+
+	if (!transp->stream) {
+		return false;
+	}
+
+	return true;
+}
+
+static unsigned int rpc_tstream_set_timeout(void *priv, unsigned int timeout)
+{
+	struct rpc_tstream_state *transp =
+		talloc_get_type_abort(priv, struct rpc_tstream_state);
+	int orig_timeout;
+	bool ok;
+
+	ok = rpc_tstream_is_connected(transp);
+	if (!ok) {
+		return 0;
+	}
+
+	orig_timeout = transp->timeout;
+
+	transp->timeout = timeout;
+
+	return orig_timeout;
+}
+
+struct rpc_tstream_next_vector_state {
+	uint8_t *buf;
+	size_t len;
+	off_t ofs;
+	size_t remaining;
+};
+
+static void rpc_tstream_next_vector_init(
+				struct rpc_tstream_next_vector_state *s,
+				uint8_t *buf, size_t len)
+{
+	ZERO_STRUCTP(s);
+
+	s->buf = buf;
+	s->len = MIN(len, UINT16_MAX);
+}
+
+static int rpc_tstream_next_vector(struct tstream_context *stream,
+				   void *private_data,
+				   TALLOC_CTX *mem_ctx,
+				   struct iovec **_vector,
+				   size_t *count)
+{
+	struct rpc_tstream_next_vector_state *state =
+		(struct rpc_tstream_next_vector_state *)private_data;
+	struct iovec *vector;
+	ssize_t pending;
+	size_t wanted;
+
+	if (state->ofs == state->len) {
+		*_vector = NULL;
+		*count = 0;
+		return 0;
+	}
+
+	pending = tstream_pending_bytes(stream);
+	if (pending == -1) {
+		return -1;
+	}
+
+	if (pending == 0 && state->ofs != 0) {
+		/* return a short read */
+		*_vector = NULL;
+		*count = 0;
+		return 0;
+	}
+
+	if (pending == 0) {
+		/* we want at least one byte and recheck again */
+		wanted = 1;
+	} else {
+		size_t missing = state->len - state->ofs;
+		if (pending > missing) {
+			/* there's more available */
+			state->remaining = pending - missing;
+			wanted = missing;
+		} else {
+			/* read what we can get and recheck in the next cycle */
+			wanted = pending;
+		}
+	}
+
+	vector = talloc_array(mem_ctx, struct iovec, 1);
+	if (!vector) {
+		return -1;
+	}
+
+	vector[0].iov_base = state->buf + state->ofs;
+	vector[0].iov_len = wanted;
+
+	state->ofs += wanted;
+
+	*_vector = vector;
+	*count = 1;
+	return 0;
+}
+
+struct rpc_tstream_read_state {
+	struct rpc_tstream_state *transp;
+	struct rpc_tstream_next_vector_state next_vector;
+	ssize_t nread;
+};
+
+static void rpc_tstream_read_done(struct tevent_req *subreq);
+
+static struct tevent_req *rpc_tstream_read_send(TALLOC_CTX *mem_ctx,
+					     struct event_context *ev,
+					     uint8_t *data, size_t size,
+					     void *priv)
+{
+	struct rpc_tstream_state *transp =
+		talloc_get_type_abort(priv, struct rpc_tstream_state);
+	struct tevent_req *req, *subreq;
+	struct rpc_tstream_read_state *state;
+	struct timeval endtime;
+
+	req = tevent_req_create(mem_ctx, &state, struct rpc_tstream_read_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	if (!rpc_tstream_is_connected(transp)) {
+		tevent_req_nterror(req, NT_STATUS_CONNECTION_INVALID);
+		return tevent_req_post(req, ev);
+	}
+	state->transp = transp;
+	rpc_tstream_next_vector_init(&state->next_vector, data, size);
+
+	subreq = tstream_readv_pdu_queue_send(state, ev,
+					      transp->stream,
+					      transp->read_queue,
+					      rpc_tstream_next_vector,
+					      &state->next_vector);
+	if (subreq == NULL) {
+		tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
+		return tevent_req_post(req, ev);
+	}
+
+	endtime = timeval_current_ofs(0, transp->timeout * 1000);
+	if (!tevent_req_set_endtime(subreq, ev, endtime)) {
+		goto fail;
+	}
+
+	tevent_req_set_callback(subreq, rpc_tstream_read_done, req);
+	return req;
+ fail:
+	TALLOC_FREE(req);
+	return NULL;
+}
+
+static void rpc_tstream_read_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq, struct tevent_req);
+	struct rpc_tstream_read_state *state =
+		tevent_req_data(req, struct rpc_tstream_read_state);
+	int err;
+
+	state->nread = tstream_readv_pdu_queue_recv(subreq, &err);
+	TALLOC_FREE(subreq);
+	if (state->nread < 0) {
+		rpc_tstream_disconnect(state->transp);
+		tevent_req_nterror(req, map_nt_error_from_unix(err));
+		return;
+	}
+	tevent_req_done(req);
+}
+
+static NTSTATUS rpc_tstream_read_recv(struct tevent_req *req, ssize_t *size)
+{
+	struct rpc_tstream_read_state *state = tevent_req_data(
+		req, struct rpc_tstream_read_state);
+	NTSTATUS status;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		return status;
+	}
+	*size = state->nread;
+	return NT_STATUS_OK;
+}
+
+struct rpc_tstream_write_state {
+	struct event_context *ev;
+	struct rpc_tstream_state *transp;
+	struct iovec iov;
+	ssize_t nwritten;
+};
+
+static void rpc_tstream_write_done(struct tevent_req *subreq);
+
+static struct tevent_req *rpc_tstream_write_send(TALLOC_CTX *mem_ctx,
+					      struct event_context *ev,
+					      const uint8_t *data, size_t size,
+					      void *priv)
+{
+	struct rpc_tstream_state *transp =
+		talloc_get_type_abort(priv, struct rpc_tstream_state);
+	struct tevent_req *req, *subreq;
+	struct rpc_tstream_write_state *state;
+	struct timeval endtime;
+
+	req = tevent_req_create(mem_ctx, &state, struct rpc_tstream_write_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	if (!rpc_tstream_is_connected(transp)) {
+		tevent_req_nterror(req, NT_STATUS_CONNECTION_INVALID);
+		return tevent_req_post(req, ev);
+	}
+	state->ev = ev;
+	state->transp = transp;
+	state->iov.iov_base = discard_const_p(void *, data);
+	state->iov.iov_len = size;
+
+	subreq = tstream_writev_queue_send(state, ev,
+					   transp->stream,
+					   transp->write_queue,
+					   &state->iov, 1);
+	if (subreq == NULL) {
+		goto fail;
+	}
+
+	endtime = timeval_current_ofs(0, transp->timeout * 1000);
+	if (!tevent_req_set_endtime(subreq, ev, endtime)) {
+		goto fail;
+	}
+
+	tevent_req_set_callback(subreq, rpc_tstream_write_done, req);
+	return req;
+ fail:
+	TALLOC_FREE(req);
+	return NULL;
+}
+
+static void rpc_tstream_write_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq, struct tevent_req);
+	struct rpc_tstream_write_state *state =
+		tevent_req_data(req, struct rpc_tstream_write_state);
+	int err;
+
+	state->nwritten = tstream_writev_queue_recv(subreq, &err);
+	TALLOC_FREE(subreq);
+	if (state->nwritten < 0) {
+		rpc_tstream_disconnect(state->transp);
+		tevent_req_nterror(req, map_nt_error_from_unix(err));
+		return;
+	}
+	tevent_req_done(req);
+}
+
+static NTSTATUS rpc_tstream_write_recv(struct tevent_req *req, ssize_t *sent)
+{
+	struct rpc_tstream_write_state *state =
+		tevent_req_data(req, struct rpc_tstream_write_state);
+	NTSTATUS status;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		return status;
+	}
+	*sent = state->nwritten;
+	return NT_STATUS_OK;
+}
+
+/**
+* @brief Initialize a tstream transport facility
+*	 NOTE: this function will talloc_steal, the stream and the queues.
+*
+* @param mem_ctx	- memory context used to allocate the transport
+* @param stream		- a ready to use tstream
+* @param read_queue	- pre-createted tstream read queue
+* @param write_queue	- pre-createted tstream write queue
+* @param presult	- the transport structure
+*
+* @return		- a NT Status error code.
+*/
+NTSTATUS rpc_transport_tstream_init(TALLOC_CTX *mem_ctx,
+				struct tstream_context *stream,
+				struct tevent_queue *read_queue,
+				struct tevent_queue *write_queue,
+				 struct rpc_cli_transport **presult)
+{
+	struct rpc_cli_transport *result;
+	struct rpc_tstream_state *state;
+
+	result = talloc(mem_ctx, struct rpc_cli_transport);
+	if (result == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	state = talloc(result, struct rpc_tstream_state);
+	if (state == NULL) {
+		TALLOC_FREE(result);
+		return NT_STATUS_NO_MEMORY;
+	}
+	result->priv = state;
+
+	state->stream = talloc_steal(state, stream);
+	state->read_queue = talloc_steal(state, read_queue);
+	state->write_queue = talloc_steal(state, write_queue);
+	state->timeout = 10000; /* 10 seconds. */
+
+	result->trans_send = NULL;
+	result->trans_recv = NULL;
+	result->write_send = rpc_tstream_write_send;
+	result->write_recv = rpc_tstream_write_recv;
+	result->read_send = rpc_tstream_read_send;
+	result->read_recv = rpc_tstream_read_recv;
+	result->is_connected = rpc_tstream_is_connected;
+	result->set_timeout = rpc_tstream_set_timeout;
+
+	*presult = result;
+	return NT_STATUS_OK;
+}