libcli/named_pipe_auth: add tstream_npa_connect_send/recv()

Add a tstream client implemenation for the named pipe auth
code. This supports byte and message mode.

metze

3 files changed, 1122 insertions, 0 deletions

diff --git a/libcli/named_pipe_auth/config.mk b/libcli/named_pipe_auth/config.mk
new file mode 100644
index 0000000000..6d44ef4141
--- /dev/null
+++ b/libcli/named_pipe_auth/config.mk
@@ -0,0 +1,4 @@
+[SUBSYSTEM::NAMED_PIPE_AUTH_TSTREAM]
+PUBLIC_DEPENDENCIES = NDR_NAMED_PIPE_AUTH TEVENT TSOCKET
+
+NAMED_PIPE_AUTH_TSTREAM_OBJ_FILES = ../libcli/named_pipe_auth/npa_tstream.o
diff --git a/libcli/named_pipe_auth/npa_tstream.c b/libcli/named_pipe_auth/npa_tstream.c
new file mode 100644
index 0000000000..c1a293eac4
--- /dev/null
+++ b/libcli/named_pipe_auth/npa_tstream.c
@@ -0,0 +1,1059 @@
+/*
+   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 "system/network.h"
+#include "../util/tevent_unix.h"
+#include "../lib/tsocket/tsocket.h"
+#include "../lib/tsocket/tsocket_internal.h"
+#include "../librpc/gen_ndr/ndr_named_pipe_auth.h"
+#include "../libcli/named_pipe_auth/npa_tstream.h"
+#include "libcli/raw/smb.h"
+
+static const struct tstream_context_ops tstream_npa_ops;
+
+struct tstream_npa {
+	struct tstream_context *unix_stream;
+
+	uint16_t file_type;
+
+	struct iovec pending;
+};
+
+struct tstream_npa_connect_state {
+	struct {
+		struct tevent_context *ev;
+		struct smb_iconv_convenience *smb_iconv_c;
+	} caller;
+
+	const char *unix_path;
+	struct tsocket_address *unix_laddr;
+	struct tsocket_address *unix_raddr;
+	struct tstream_context *unix_stream;
+
+	struct named_pipe_auth_req auth_req;
+	DATA_BLOB auth_req_blob;
+	struct iovec auth_req_iov;
+
+	struct named_pipe_auth_rep auth_rep;
+	DATA_BLOB auth_rep_blob;
+};
+
+static void tstream_npa_connect_unix_done(struct tevent_req *subreq);
+
+struct tevent_req *tstream_npa_connect_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct smb_iconv_convenience *smb_iconv_c,
+					const char *directory,
+					const char *npipe,
+					const struct tsocket_address *client,
+					const char *client_name,
+					const struct tsocket_address *server,
+					const char *server_name,
+					const struct netr_SamInfo3 *info3,
+					DATA_BLOB session_key)
+{
+	struct tevent_req *req;
+	struct tstream_npa_connect_state *state;
+	struct tevent_req *subreq;
+	int ret;
+	enum ndr_err_code ndr_err;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct tstream_npa_connect_state);
+	if (!req) {
+		return NULL;
+	}
+
+	state->caller.ev = ev;
+	state->caller.smb_iconv_c = smb_iconv_c;
+
+	state->unix_path = talloc_asprintf(state, "%s/%s",
+					   directory,
+					   npipe);
+	if (tevent_req_nomem(state->unix_path, req)) {
+		goto post;
+	}
+
+	ret = tsocket_address_unix_from_path(state,
+					     "",
+					     &state->unix_laddr);
+	if (ret == -1) {
+		tevent_req_error(req, errno);
+		goto post;
+	}
+
+	ret = tsocket_address_unix_from_path(state,
+					     state->unix_path,
+					     &state->unix_raddr);
+	if (ret == -1) {
+		tevent_req_error(req, errno);
+		goto post;
+	}
+
+	ZERO_STRUCT(state->auth_req);
+	if (client) {
+		struct named_pipe_auth_req_info2 *info2;
+
+		if (!server) {
+			tevent_req_error(req, EINVAL);
+			goto post;
+		}
+
+		state->auth_req.level = 2;
+		info2 = &state->auth_req.info.info2;
+
+		info2->client_name = client_name;
+		info2->client_addr = tsocket_address_inet_addr_string(client, state);
+		if (!info2->client_addr) {
+			/* errno might be EINVAL */
+			tevent_req_error(req, errno);
+			goto post;
+		}
+		info2->client_port = tsocket_address_inet_port(client);
+		if (!info2->client_name) {
+			info2->client_name = info2->client_addr;
+		}
+
+		info2->server_addr = tsocket_address_inet_addr_string(server, state);
+		if (!info2->server_addr) {
+			/* errno might be EINVAL */
+			tevent_req_error(req, errno);
+			goto post;
+		}
+		info2->server_port = tsocket_address_inet_port(server);
+		if (!info2->server_name) {
+			info2->server_name = info2->server_addr;
+		}
+
+		info2->sam_info3 = discard_const_p(struct netr_SamInfo3, info3);
+		info2->session_key_length = session_key.length;
+		info2->session_key = session_key.data;
+	} else if (info3) {
+		state->auth_req.level = 1;
+		state->auth_req.info.info1 = *info3;
+	} else {
+		state->auth_req.level = 0;
+	}
+
+	if (DEBUGLVL(10)) {
+		NDR_PRINT_DEBUG(named_pipe_auth_req, &state->auth_req);
+	}
+
+	ndr_err = ndr_push_struct_blob(&state->auth_req_blob,
+			state, smb_iconv_c, &state->auth_req,
+			(ndr_push_flags_fn_t)ndr_push_named_pipe_auth_req);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		tevent_req_error(req, EINVAL);
+		goto post;
+	}
+
+	state->auth_req_iov.iov_base = state->auth_req_blob.data;
+	state->auth_req_iov.iov_len = state->auth_req_blob.length;
+
+	subreq = tstream_unix_connect_send(state,
+					   state->caller.ev,
+					   state->unix_laddr,
+					   state->unix_raddr);
+	if (tevent_req_nomem(subreq, req)) {
+		goto post;
+	}
+	tevent_req_set_callback(subreq, tstream_npa_connect_unix_done, req);
+
+	return req;
+
+post:
+	tevent_req_post(req, ev);
+	return req;
+}
+
+static void tstream_npa_connect_writev_done(struct tevent_req *subreq);
+
+static void tstream_npa_connect_unix_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	struct tstream_npa_connect_state *state =
+		tevent_req_data(req,
+		struct tstream_npa_connect_state);
+	int ret;
+	int sys_errno;
+
+	ret = tstream_unix_connect_recv(subreq, &sys_errno,
+					state, &state->unix_stream);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, sys_errno);
+		return;
+	}
+
+	subreq = tstream_writev_send(state,
+				     state->caller.ev,
+				     state->unix_stream,
+				     &state->auth_req_iov, 1);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, tstream_npa_connect_writev_done, req);
+}
+
+static int tstream_npa_connect_next_vector(struct tstream_context *unix_stream,
+					   void *private_data,
+					   TALLOC_CTX *mem_ctx,
+					   struct iovec **_vector,
+					   size_t *_count);
+static void tstream_npa_connect_readv_done(struct tevent_req *subreq);
+
+static void tstream_npa_connect_writev_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	struct tstream_npa_connect_state *state =
+		tevent_req_data(req,
+		struct tstream_npa_connect_state);
+	int ret;
+	int sys_errno;
+
+	ret = tstream_writev_recv(subreq, &sys_errno);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, sys_errno);
+		return;
+	}
+
+	state->auth_rep_blob = data_blob_const(NULL, 0);
+
+	subreq = tstream_readv_pdu_send(state, state->caller.ev,
+					state->unix_stream,
+					tstream_npa_connect_next_vector,
+					state);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, tstream_npa_connect_readv_done, req);
+}
+
+static int tstream_npa_connect_next_vector(struct tstream_context *unix_stream,
+					   void *private_data,
+					   TALLOC_CTX *mem_ctx,
+					   struct iovec **_vector,
+					   size_t *_count)
+{
+	struct tstream_npa_connect_state *state = talloc_get_type_abort(private_data,
+					struct tstream_npa_connect_state);
+	struct iovec *vector;
+	size_t count;
+	off_t ofs = 0;
+
+	if (state->auth_rep_blob.length == 0) {
+		state->auth_rep_blob = data_blob_talloc(state, NULL, 4);
+		if (!state->auth_rep_blob.data) {
+			return -1;
+		}
+	} else if (state->auth_rep_blob.length == 4) {
+		uint32_t msg_len;
+
+		ofs = 4;
+
+		msg_len = RIVAL(state->auth_rep_blob.data, 0);
+
+		if (msg_len > 0x00FFFFFF) {
+			errno = EMSGSIZE;
+			return -1;
+		}
+
+		if (msg_len == 0) {
+			errno = EMSGSIZE;
+			return -1;
+		}
+
+		msg_len += ofs;
+
+		state->auth_rep_blob.data = talloc_realloc(state,
+						state->auth_rep_blob.data,
+						uint8_t, msg_len);
+		if (!state->auth_rep_blob.data) {
+			return -1;
+		}
+		state->auth_rep_blob.length = msg_len;
+	} else {
+		*_vector = NULL;
+		*_count = 0;
+		return 0;
+	}
+
+	/* we need to get a message header */
+	vector = talloc_array(mem_ctx, struct iovec, 1);
+	if (!vector) {
+		return -1;
+	}
+	vector[0].iov_base = state->auth_rep_blob.data + ofs;
+	vector[0].iov_len = state->auth_rep_blob.length - ofs;
+	count = 1;
+
+	*_vector = vector;
+	*_count = count;
+	return 0;
+}
+
+static void tstream_npa_connect_readv_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	struct tstream_npa_connect_state *state =
+		tevent_req_data(req,
+		struct tstream_npa_connect_state);
+	int ret;
+	int sys_errno;
+	enum ndr_err_code ndr_err;
+
+	ret = tstream_readv_pdu_recv(subreq, &sys_errno);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, sys_errno);
+		return;
+	}
+
+	DEBUG(10,("name_pipe_auth_rep(client)[%u]\n",
+		 (uint32_t)state->auth_rep_blob.length));
+	dump_data(11, state->auth_rep_blob.data, state->auth_rep_blob.length);
+
+	ndr_err = ndr_pull_struct_blob(
+		&state->auth_rep_blob, state,
+		state->caller.smb_iconv_c, &state->auth_rep,
+		(ndr_pull_flags_fn_t)ndr_pull_named_pipe_auth_rep);
+
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		DEBUG(0, ("ndr_pull_named_pipe_auth_rep failed: %s\n",
+			  ndr_map_error2string(ndr_err)));
+		tevent_req_error(req, EIO);
+		return;
+	}
+
+	if (DEBUGLVL(10)) {
+		NDR_PRINT_DEBUG(named_pipe_auth_rep, &state->auth_rep);
+	}
+
+	if (state->auth_rep.length < 16) {
+		DEBUG(0, ("req invalid length: %u < 16\n",
+			  state->auth_rep.length));
+		tevent_req_error(req, EIO);
+		return;
+	}
+
+	if (strcmp(NAMED_PIPE_AUTH_MAGIC, state->auth_rep.magic) != 0) {
+		DEBUG(0, ("req invalid magic: %s != %s\n",
+			  state->auth_rep.magic, NAMED_PIPE_AUTH_MAGIC));
+		tevent_req_error(req, EIO);
+		return;
+	}
+
+	if (!NT_STATUS_IS_OK(state->auth_rep.status)) {
+		DEBUG(0, ("req failed: %s\n",
+			  nt_errstr(state->auth_rep.status)));
+		tevent_req_error(req, EACCES);
+		return;
+	}
+
+	if (state->auth_rep.level != state->auth_req.level) {
+		DEBUG(0, ("req invalid level: %u != %u\n",
+			  state->auth_rep.level, state->auth_req.level));
+		tevent_req_error(req, EIO);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+int _tstream_npa_connect_recv(struct tevent_req *req,
+			      int *perrno,
+			      TALLOC_CTX *mem_ctx,
+			      struct tstream_context **_stream,
+			      uint16_t *_file_type,
+			      uint16_t *_device_state,
+			      uint64_t *_allocation_size,
+			      const char *location)
+{
+	struct tstream_npa_connect_state *state =
+		tevent_req_data(req,
+		struct tstream_npa_connect_state);
+	struct tstream_context *stream;
+	struct tstream_npa *npas;
+	uint16_t device_state = 0;
+	uint64_t allocation_size = 0;
+
+	if (tevent_req_is_unix_error(req, perrno)) {
+		tevent_req_received(req);
+		return -1;
+	}
+
+	stream = tstream_context_create(mem_ctx,
+					&tstream_npa_ops,
+					&npas,
+					struct tstream_npa,
+					location);
+	if (!stream) {
+		return -1;
+	}
+	ZERO_STRUCTP(npas);
+
+	npas->unix_stream = talloc_move(stream, &state->unix_stream);
+	switch (state->auth_rep.level) {
+	case 0:
+	case 1:
+		npas->file_type = FILE_TYPE_BYTE_MODE_PIPE;
+		device_state = 0x00ff;
+		allocation_size = 2048;
+		break;
+	case 2:
+		npas->file_type = state->auth_rep.info.info2.file_type;
+		device_state = state->auth_rep.info.info2.device_state;
+		allocation_size = state->auth_rep.info.info2.allocation_size;
+		break;
+	}
+
+	*_stream = stream;
+	*_file_type = npas->file_type;
+	*_device_state = device_state;
+	*_allocation_size = allocation_size;
+	tevent_req_received(req);
+	return 0;
+}
+
+static ssize_t tstream_npa_pending_bytes(struct tstream_context *stream)
+{
+	struct tstream_npa *npas = tstream_context_data(stream,
+				   struct tstream_npa);
+	ssize_t ret;
+
+	if (!npas->unix_stream) {
+		errno = ENOTCONN;
+		return -1;
+	}
+
+	switch (npas->file_type) {
+	case FILE_TYPE_BYTE_MODE_PIPE:
+		ret = tstream_pending_bytes(npas->unix_stream);
+		break;
+
+	case FILE_TYPE_MESSAGE_MODE_PIPE:
+		ret = npas->pending.iov_len;
+		break;
+	}
+
+	return ret;
+}
+
+struct tstream_npa_readv_state {
+	struct tstream_context *stream;
+
+	struct iovec *vector;
+	size_t count;
+
+	/* the header for message mode */
+	uint8_t hdr[2];
+	bool wait_for_hdr;
+
+	int ret;
+};
+
+static void tstream_npa_readv_byte_mode_handler(struct tevent_req *subreq);
+static int tstream_npa_readv_next_vector(struct tstream_context *stream,
+					 void *private_data,
+					 TALLOC_CTX *mem_ctx,
+					 struct iovec **_vector,
+					 size_t *_count);
+static void tstream_npa_readv_msg_mode_handler(struct tevent_req *subreq);
+
+static struct tevent_req *tstream_npa_readv_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct tstream_context *stream,
+					struct iovec *vector,
+					size_t count)
+{
+	struct tevent_req *req;
+	struct tstream_npa_readv_state *state;
+	struct tstream_npa *npas = tstream_context_data(stream, struct tstream_npa);
+	struct tevent_req *subreq;
+	off_t ofs;
+	size_t left;
+	uint8_t *pbase;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct tstream_npa_readv_state);
+	if (!req) {
+		return NULL;
+	}
+
+	state->stream	= stream;
+	state->ret	= 0;
+
+	if (!npas->unix_stream) {
+		tevent_req_error(req, ENOTCONN);
+		goto post;
+	}
+
+	switch (npas->file_type) {
+	case FILE_TYPE_BYTE_MODE_PIPE:
+		state->vector = vector;
+		state->count = count;
+
+		subreq = tstream_readv_send(state,
+					    ev,
+					    npas->unix_stream,
+					    state->vector,
+					    state->count);
+		if (tevent_req_nomem(subreq,req)) {
+			goto post;
+		}
+		tevent_req_set_callback(subreq,
+					tstream_npa_readv_byte_mode_handler,
+					req);
+
+		return req;
+
+	case FILE_TYPE_MESSAGE_MODE_PIPE:
+		/*
+		 * we make a copy of the vector and prepend a header
+		 * with the length
+		 */
+		state->vector	= talloc_array(state, struct iovec, count);
+		if (tevent_req_nomem(state->vector, req)) {
+			goto post;
+		}
+		memcpy(state->vector, vector, sizeof(struct iovec)*count);
+		state->count = count;
+
+		/*
+		 * copy the pending buffer first
+		 */
+		ofs = 0;
+		left = npas->pending.iov_len;
+		pbase = (uint8_t *)npas->pending.iov_base;
+
+		while (left > 0 && state->count > 0) {
+			uint8_t *base;
+			base = (uint8_t *)state->vector[0].iov_base;
+			if (left < state->vector[0].iov_len) {
+				memcpy(base, pbase + ofs, left);
+
+				base += left;
+				state->vector[0].iov_base = base;
+				state->vector[0].iov_len -= left;
+
+				ofs += left;
+				left = 0;
+				TALLOC_FREE(pbase);
+				ZERO_STRUCT(npas->pending);
+				break;
+			}
+			memcpy(base, pbase + ofs, state->vector[0].iov_len);
+
+			ofs += state->vector[0].iov_len;
+			left -= state->vector[0].iov_len;
+			state->vector += 1;
+			state->count -= 1;
+
+			if (left == 0) {
+				TALLOC_FREE(pbase);
+				ZERO_STRUCT(npas->pending);
+				break;
+			}
+		}
+
+		if (left > 0) {
+			memmove(pbase, pbase + ofs, left);
+			npas->pending.iov_base = pbase;
+			npas->pending.iov_len = left;
+			/*
+			 * this cannot fail and even if it
+			 * fails we can handle it
+			 */
+			pbase = talloc_realloc(npas, pbase, uint8_t, left);
+			if (pbase) {
+				npas->pending.iov_base = pbase;
+			}
+			pbase = NULL;
+		}
+
+		state->ret += ofs;
+
+		if (state->count == 0) {
+			tevent_req_done(req);
+			goto post;
+		}
+
+		ZERO_STRUCT(state->hdr);
+		state->wait_for_hdr = false;
+
+		subreq = tstream_readv_pdu_send(state,
+						ev,
+						npas->unix_stream,
+						tstream_npa_readv_next_vector,
+						state);
+		if (tevent_req_nomem(subreq, req)) {
+			goto post;
+		}
+		tevent_req_set_callback(subreq,
+					tstream_npa_readv_msg_mode_handler,
+					req);
+
+		return req;
+	}
+
+	/* this can't happen */
+	tevent_req_error(req, EINVAL);
+	goto post;
+
+ post:
+	tevent_req_post(req, ev);
+	return req;
+}
+
+static void tstream_npa_readv_byte_mode_handler(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(subreq,
+				 struct tevent_req);
+	struct tstream_npa_readv_state *state = tevent_req_data(req,
+					struct tstream_npa_readv_state);
+	int ret;
+	int sys_errno;
+
+	ret = tstream_readv_recv(subreq, &sys_errno);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, sys_errno);
+		return;
+	}
+
+	state->ret = ret;
+
+	tevent_req_done(req);
+}
+
+static int tstream_npa_readv_next_vector(struct tstream_context *unix_stream,
+					 void *private_data,
+					 TALLOC_CTX *mem_ctx,
+					 struct iovec **_vector,
+					 size_t *_count)
+{
+	struct tstream_npa_readv_state *state = talloc_get_type_abort(private_data,
+					struct tstream_npa_readv_state);
+	struct tstream_npa *npas = tstream_context_data(state->stream,
+				   struct tstream_npa);
+	struct iovec *vector;
+	size_t count;
+	uint16_t msg_len;
+	size_t left;
+
+	if (state->count == 0) {
+		*_vector = NULL;
+		*_count = 0;
+		return 0;
+	}
+
+	if (!state->wait_for_hdr) {
+		/* we need to get a message header */
+		vector = talloc_array(mem_ctx, struct iovec, 1);
+		if (!vector) {
+			return -1;
+		}
+		ZERO_STRUCT(state->hdr);
+		vector[0].iov_base = state->hdr;
+		vector[0].iov_len = sizeof(state->hdr);
+
+		count = 1;
+
+		state->wait_for_hdr = true;
+
+		*_vector = vector;
+		*_count = count;
+		return 0;
+	}
+
+	/* and now fill the callers buffers and maybe the pending buffer */
+	state->wait_for_hdr = false;
+
+	msg_len = SVAL(state->hdr, 0);
+
+	if (msg_len == 0) {
+		errno = EIO;
+		return -1;
+	}
+
+	state->wait_for_hdr = false;
+
+	/* +1 because we may need to fill the pending buffer */
+	vector = talloc_array(mem_ctx, struct iovec, state->count + 1);
+	if (!vector) {
+		return -1;
+	}
+
+	count = 0;
+	left = msg_len;
+	while (left > 0 && state->count > 0) {
+		if (left < state->vector[0].iov_len) {
+			uint8_t *base;
+			base = (uint8_t *)state->vector[0].iov_base;
+			vector[count].iov_base = base;
+			vector[count].iov_len = left;
+			count++;
+			base += left;
+			state->vector[0].iov_base = base;
+			state->vector[0].iov_len -= left;
+			break;
+		}
+		vector[count] = state->vector[0];
+		count++;
+		left -= state->vector[0].iov_len;
+		state->vector += 1;
+		state->count -= 1;
+	}
+
+	if (left > 0) {
+		/*
+		 * if the message if longer than the buffers the caller
+		 * requested, we need to consume the rest of the message
+		 * into the pending buffer, where the next readv can
+		 * be served from.
+		 */
+		npas->pending.iov_base = talloc_array(npas, uint8_t, left);
+		if (!npas->pending.iov_base) {
+			return -1;
+		}
+		npas->pending.iov_len = left;
+
+		vector[count] = npas->pending;
+		count++;
+	}
+
+	state->ret += (msg_len - left);
+
+	*_vector = vector;
+	*_count = count;
+	return 0;
+}
+
+static void tstream_npa_readv_msg_mode_handler(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(subreq,
+				 struct tevent_req);
+	int ret;
+	int sys_errno;
+
+	ret = tstream_readv_pdu_recv(subreq, &sys_errno);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, sys_errno);
+		return;
+	}
+
+	/*
+	 * we do not set state->ret here as ret includes the headr size.
+	 * we set it in tstream_npa_readv_pdu_next_vector()
+	 */
+
+	tevent_req_done(req);
+}
+
+static int tstream_npa_readv_recv(struct tevent_req *req,
+				   int *perrno)
+{
+	struct tstream_npa_readv_state *state = tevent_req_data(req,
+					struct tstream_npa_readv_state);
+	int ret;
+
+	ret = tsocket_simple_int_recv(req, perrno);
+	if (ret == 0) {
+		ret = state->ret;
+	}
+
+	tevent_req_received(req);
+	return ret;
+}
+
+struct tstream_npa_writev_state {
+	const struct iovec *vector;
+	size_t count;
+
+	/* the header for message mode */
+	uint8_t hdr[2];
+
+	int ret;
+};
+
+static void tstream_npa_writev_handler(struct tevent_req *subreq);
+
+static struct tevent_req *tstream_npa_writev_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct tstream_context *stream,
+					const struct iovec *vector,
+					size_t count)
+{
+	struct tevent_req *req;
+	struct tstream_npa_writev_state *state;
+	struct tstream_npa *npas = tstream_context_data(stream, struct tstream_npa);
+	struct tevent_req *subreq;
+	size_t msg_len;
+	size_t i;
+	struct iovec *new_vector;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct tstream_npa_writev_state);
+	if (!req) {
+		return NULL;
+	}
+
+	state->ret	= 0;
+
+	if (!npas->unix_stream) {
+		tevent_req_error(req, ENOTCONN);
+		goto post;
+	}
+
+	switch (npas->file_type) {
+	case FILE_TYPE_BYTE_MODE_PIPE:
+		state->vector	= vector;
+		state->count	= count;
+		break;
+
+	case FILE_TYPE_MESSAGE_MODE_PIPE:
+		/*
+		 * we make a copy of the vector and prepend a header
+		 * with the length
+		 */
+		new_vector	= talloc_array(state, struct iovec, count + 1);
+		if (tevent_req_nomem(new_vector, req)) {
+			goto post;
+		}
+		new_vector[0].iov_base = state->hdr;
+		new_vector[0].iov_len = sizeof(state->hdr);
+		memcpy(new_vector + 1, vector, sizeof(struct iovec)*count);
+
+		state->vector	= new_vector;
+		state->count	= count + 1;
+
+		msg_len = 0;
+		for (i=0; i < count; i++) {
+			msg_len += vector[i].iov_len;
+		}
+
+		if (msg_len > UINT16_MAX) {
+			tevent_req_error(req, EMSGSIZE);
+			goto post;
+		}
+
+		SSVAL(state->hdr, 0, msg_len);
+		break;
+	}
+
+	subreq = tstream_writev_send(state,
+				     ev,
+				     npas->unix_stream,
+				     state->vector,
+				     state->count);
+	if (tevent_req_nomem(subreq, req)) {
+		goto post;
+	}
+	tevent_req_set_callback(subreq, tstream_npa_writev_handler, req);
+
+	return req;
+
+ post:
+	tevent_req_post(req, ev);
+	return req;
+}
+
+static void tstream_npa_writev_handler(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(subreq,
+				 struct tevent_req);
+	struct tstream_npa_writev_state *state = tevent_req_data(req,
+					struct tstream_npa_writev_state);
+	int ret;
+	int sys_errno;
+
+	ret = tstream_writev_recv(subreq, &sys_errno);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, sys_errno);
+		return;
+	}
+
+	state->ret = ret;
+
+	tevent_req_done(req);
+}
+
+static int tstream_npa_writev_recv(struct tevent_req *req,
+				   int *perrno)
+{
+	struct tstream_npa_writev_state *state = tevent_req_data(req,
+					struct tstream_npa_writev_state);
+	int ret;
+
+	ret = tsocket_simple_int_recv(req, perrno);
+	if (ret == 0) {
+		ret = state->ret;
+	}
+
+	tevent_req_received(req);
+	return ret;
+}
+
+struct tstream_npa_disconnect_state {
+	struct tstream_context *stream;
+};
+
+static void tstream_npa_disconnect_handler(struct tevent_req *subreq);
+
+static struct tevent_req *tstream_npa_disconnect_send(TALLOC_CTX *mem_ctx,
+						struct tevent_context *ev,
+						struct tstream_context *stream)
+{
+	struct tstream_npa *npas = tstream_context_data(stream, struct tstream_npa);
+	struct tevent_req *req;
+	struct tstream_npa_disconnect_state *state;
+	struct tevent_req *subreq;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct tstream_npa_disconnect_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->stream = stream;
+
+	if (!npas->unix_stream) {
+		tevent_req_error(req, ENOTCONN);
+		goto post;
+	}
+
+	subreq = tstream_disconnect_send(state,
+					 ev,
+					 npas->unix_stream);
+	if (tevent_req_nomem(subreq, req)) {
+		goto post;
+	}
+	tevent_req_set_callback(subreq, tstream_npa_disconnect_handler, req);
+
+	return req;
+
+post:
+	tevent_req_post(req, ev);
+	return req;
+}
+
+static void tstream_npa_disconnect_handler(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(subreq,
+				 struct tevent_req);
+	struct tstream_npa_disconnect_state *state = tevent_req_data(req,
+					struct tstream_npa_disconnect_state);
+	struct tstream_context *stream = state->stream;
+	struct tstream_npa *npas = tstream_context_data(stream, struct tstream_npa);
+	int ret;
+	int sys_errno;
+
+	ret = tstream_disconnect_recv(subreq, &sys_errno);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, sys_errno);
+		return;
+	}
+
+	TALLOC_FREE(npas->unix_stream);
+
+	tevent_req_done(req);
+}
+
+static int tstream_npa_disconnect_recv(struct tevent_req *req,
+				       int *perrno)
+{
+	int ret;
+
+	ret = tsocket_simple_int_recv(req, perrno);
+
+	tevent_req_received(req);
+	return ret;
+}
+
+static const struct tstream_context_ops tstream_npa_ops = {
+	.name			= "npa",
+
+	.pending_bytes		= tstream_npa_pending_bytes,
+
+	.readv_send		= tstream_npa_readv_send,
+	.readv_recv		= tstream_npa_readv_recv,
+
+	.writev_send		= tstream_npa_writev_send,
+	.writev_recv		= tstream_npa_writev_recv,
+
+	.disconnect_send	= tstream_npa_disconnect_send,
+	.disconnect_recv	= tstream_npa_disconnect_recv,
+};
+
+int _tstream_npa_existing_socket(TALLOC_CTX *mem_ctx,
+				 int fd,
+				 uint16_t file_type,
+				 struct tstream_context **_stream,
+				 const char *location)
+{
+	struct tstream_context *stream;
+	struct tstream_npa *npas;
+	int ret;
+
+	switch (file_type) {
+	case FILE_TYPE_BYTE_MODE_PIPE:
+		break;
+	case FILE_TYPE_MESSAGE_MODE_PIPE:
+		break;
+	default:
+		errno = EINVAL;
+		return -1;
+	}
+
+	stream = tstream_context_create(mem_ctx,
+					&tstream_npa_ops,
+					&npas,
+					struct tstream_npa,
+					location);
+	if (!stream) {
+		return -1;
+	}
+	ZERO_STRUCTP(npas);
+
+	npas->file_type = file_type;
+
+	ret = tstream_bsd_existing_socket(stream, fd,
+					  &npas->unix_stream);
+	if (ret == -1) {
+		int saved_errno = errno;
+		talloc_free(stream);
+		errno = saved_errno;
+		return -1;
+	}
+
+	*_stream = stream;
+	return 0;
+}
+
diff --git a/libcli/named_pipe_auth/npa_tstream.h b/libcli/named_pipe_auth/npa_tstream.h
new file mode 100644
index 0000000000..6ffd7b8632
--- /dev/null
+++ b/libcli/named_pipe_auth/npa_tstream.h
@@ -0,0 +1,59 @@
+/*
+   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 NPA_TSTREAM_H
+#define NPA_TSTREAM_H
+
+struct tevent_req;
+struct tevent_context;
+struct netr_SamInfo3;
+
+struct tevent_req *tstream_npa_connect_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct smb_iconv_convenience *smb_iconv_c,
+					const char *directory,
+					const char *npipe,
+					const struct tsocket_address *client,
+					const char *client_name,
+					const struct tsocket_address *server,
+					const char *server_name,
+					const struct netr_SamInfo3 *info3,
+					DATA_BLOB session_key);
+int _tstream_npa_connect_recv(struct tevent_req *req,
+			      int *perrno,
+			      TALLOC_CTX *mem_ctx,
+			      struct tstream_context **stream,
+			      uint16_t *file_type,
+			      uint16_t *device_state,
+			      uint64_t *allocation_size,
+			      const char *location);
+#define tstream_npa_connect_recv(req, perrno, mem_ctx, stream, f, d, a) \
+	_tstream_npa_connect_recv(req, perrno, mem_ctx, stream, f, d, a, \
+				  __location__)
+
+int _tstream_npa_existing_socket(TALLOC_CTX *mem_ctx,
+				 int fd,
+				 uint16_t file_type,
+				 struct tstream_context **_stream,
+				 const char *location);
+#define tstream_npa_existing_socket(mem_ctx, fd, ft, stream) \
+	_tstream_npa_existing_socket(mem_ctx, fd, ft, stream, \
+				     __location__)
+
+#endif /* NPA_TSTREAM_H */