libcli/util: add tstream_read_pdu_blob_send/recv

This will take the some full_request callback function
as the Samba4 packet code.

metze

2 files changed, 246 insertions, 0 deletions

diff --git a/libcli/util/tstream.c b/libcli/util/tstream.c
new file mode 100644
index 0000000000..f6c92f3385
--- /dev/null
+++ b/libcli/util/tstream.c
@@ -0,0 +1,167 @@
+/*
+ *  Unix SMB/CIFS implementation.
+ *
+ *  Copyright (C) Stefan Metzmacher 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"
+#include <tevent.h>
+#include "system/filesys.h"
+#include "../lib/tsocket/tsocket.h"
+#include "../libcli/util/tstream.h"
+#include "../lib/util/tevent_ntstatus.h"
+
+struct tstream_read_pdu_blob_state {
+	/* this structs are owned by the caller */
+	struct {
+		struct tevent_context *ev;
+		struct tstream_context *stream;
+		NTSTATUS (*full_fn)(void *private_data,
+				    DATA_BLOB blob,
+				    size_t *packet_size);
+		void *full_private;
+	} caller;
+
+	DATA_BLOB pdu_blob;
+	struct iovec tmp_vector;
+};
+
+static void tstream_read_pdu_blob_done(struct tevent_req *subreq);
+
+struct tevent_req *tstream_read_pdu_blob_send(TALLOC_CTX *mem_ctx,
+				struct tevent_context *ev,
+				struct tstream_context *stream,
+				size_t initial_read_size,
+				NTSTATUS (*full_fn)(void *private_data,
+						    DATA_BLOB blob,
+						    size_t *packet_size),
+				void *full_private)
+{
+	struct tevent_req *req;
+	struct tstream_read_pdu_blob_state *state;
+	struct tevent_req *subreq;
+	uint8_t *buf;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct tstream_read_pdu_blob_state);
+	if (!req) {
+		return NULL;
+	}
+
+	state->caller.ev		= ev;
+	state->caller.stream		= stream;
+	state->caller.full_fn		= full_fn;
+	state->caller.full_private	= full_private;
+
+	if (initial_read_size == 0) {
+		tevent_req_error(req, EINVAL);
+		return tevent_req_post(req, ev);
+	}
+
+	buf = talloc_array(state, uint8_t, initial_read_size);
+	if (tevent_req_nomem(buf, req)) {
+		return tevent_req_post(req, ev);
+	}
+	state->pdu_blob.data = buf;
+	state->pdu_blob.length = initial_read_size;
+
+	state->tmp_vector.iov_base = buf;
+	state->tmp_vector.iov_len = initial_read_size;
+
+	subreq = tstream_readv_send(state, ev, stream, &state->tmp_vector, 1);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, tstream_read_pdu_blob_done, req);
+
+	return req;
+}
+
+static void tstream_read_pdu_blob_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	struct tstream_read_pdu_blob_state *state =
+		tevent_req_data(req,
+		struct tstream_read_pdu_blob_state);
+	ssize_t ret;
+	int sys_errno;
+	size_t pdu_size;
+	NTSTATUS status;
+	uint8_t *buf;
+
+	ret = tstream_readv_recv(subreq, &sys_errno);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		status = map_nt_error_from_unix(sys_errno);
+		tevent_req_nterror(req, status);
+		return;
+	}
+
+	status = state->caller.full_fn(state->caller.full_private,
+				       state->pdu_blob, &pdu_size);
+	if (NT_STATUS_IS_OK(status)) {
+		tevent_req_done(req);
+		return;
+	} else if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
+		/* more to get */
+	} else if (!NT_STATUS_IS_OK(status)) {
+		tevent_req_nterror(req, status);
+		return;
+	}
+
+	buf = talloc_realloc(state, state->pdu_blob.data, uint8_t, pdu_size);
+	if (tevent_req_nomem(buf, req)) {
+		return;
+	}
+	state->pdu_blob.data = buf;
+	state->pdu_blob.length = pdu_size;
+
+	state->tmp_vector.iov_base = buf + state->tmp_vector.iov_len;
+	state->tmp_vector.iov_len = pdu_size - state->tmp_vector.iov_len;
+
+	subreq = tstream_readv_send(state,
+				    state->caller.ev,
+				    state->caller.stream,
+				    &state->tmp_vector,
+				    1);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, tstream_read_pdu_blob_done, req);
+}
+
+NTSTATUS tstream_read_pdu_blob_recv(struct tevent_req *req,
+				    TALLOC_CTX *mem_ctx,
+				    DATA_BLOB *pdu_blob)
+{
+	struct tstream_read_pdu_blob_state *state = tevent_req_data(req,
+					struct tstream_read_pdu_blob_state);
+	NTSTATUS status;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		tevent_req_received(req);
+		return status;
+	}
+
+	*pdu_blob = state->pdu_blob;
+	talloc_steal(mem_ctx, pdu_blob->data);
+
+	tevent_req_received(req);
+	return NT_STATUS_OK;
+}
+
diff --git a/libcli/util/tstream.h b/libcli/util/tstream.h
new file mode 100644
index 0000000000..a945287985
--- /dev/null
+++ b/libcli/util/tstream.h
@@ -0,0 +1,79 @@
+/*
+ *  Unix SMB/CIFS implementation.
+ *
+ *  Copyright (C) Stefan Metzmacher 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/>.
+ */
+
+#ifndef _LIBCLI_UTIL_TSTREAM_H_
+#define _LIBCLI_UTIL_TSTREAM_H_
+
+/**
+ * @brief A helper function to read a full PDU from a stream
+ *
+ * This function is designed for simple PDUs and as compat layer
+ * for the Samba4 packet interface.
+ *
+ * tstream_readv_pdu_send() is a more powerful interface,
+ * which is part of the main (non samba specific) tsocket code.
+ *
+ * @param[in] mem_ctx		The memory context for the result.
+ *
+ * @param[in] ev		The event context the operation should work on.
+ *
+ * @param[in] stream		The stream to read data from.
+ *
+ * @param[in] inital_read_size	The initial byte count that is needed to workout
+ *				the full pdu size.
+ *
+ * @param[in] full_fn		The callback function that will report the size
+ *				of the full pdu.
+ *
+ * @param[in] full_private	The private data for the callback function.
+ *
+ * @return			The async request handle. NULL on fatal error.
+ *
+ * @see tstream_read_pdu_blob_recv()
+ * @see tstream_readv_pdu_send()
+ * @see tstream_readv_pdu_queue_send()
+ *
+ */
+struct tevent_req *tstream_read_pdu_blob_send(TALLOC_CTX *mem_ctx,
+				struct tevent_context *ev,
+				struct tstream_context *stream,
+				size_t inital_read_size,
+				NTSTATUS (*full_fn)(void *private_data,
+						    DATA_BLOB blob,
+						    size_t *packet_size),
+				void *full_private);
+/**
+ * @brief Receive the result of the tstream_read_pdu_blob_send() call.
+ *
+ * @param[in] req	The tevent request from tstream_read_pdu_blob_send().
+ *
+ * @param[in] mem_ctx	The memory context for returned pdu DATA_BLOB.
+ *
+ * @param[in] pdu_blob	The DATA_BLOB with the full pdu.
+ *
+ * @return		The NTSTATUS result, NT_STATUS_OK on success
+ *			and others on failure.
+ *
+ * @see tstream_read_pdu_blob_send()
+ */
+NTSTATUS tstream_read_pdu_blob_recv(struct tevent_req *req,
+				    TALLOC_CTX *mem_ctx,
+				    DATA_BLOB *pdu_blob);
+
+#endif /* _LIBCLI_UTIL_TSTREAM_H_ */