Add simple implementation of several functions in the Samba 4 RPC

library on top of the Samba 3 RPC library:

 * dcerpc_pipe_connect
 * dcerpc_ndr_request_recv
 * dcerpc_ndr_request_send

These are the main functions used by the generated client calls in Samba
4.
(This used to be commit 350177824239343365d5c99ad4efd71e3b2ed6fa)

4 files changed, 2362 insertions, 0 deletions

diff --git a/source3/librpc/rpc/binding.c b/source3/librpc/rpc/binding.c
new file mode 100644
index 0000000000..92f65b5827
--- /dev/null
+++ b/source3/librpc/rpc/binding.c
@@ -0,0 +1,708 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   dcerpc utility functions
+
+   Copyright (C) Andrew Tridgell 2003
+   Copyright (C) Jelmer Vernooij 2004
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
+   Copyright (C) Rafal Szczesniak 2006
+   
+   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"
+
+#define MAX_PROTSEQ		10
+
+static const struct {
+	const char *name;
+	enum dcerpc_transport_t transport;
+	int num_protocols;
+	enum epm_protocol protseq[MAX_PROTSEQ];
+} transports[] = {
+	{ "ncacn_np",     NCACN_NP, 3, 
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_SMB, EPM_PROTOCOL_NETBIOS }},
+	{ "ncacn_ip_tcp", NCACN_IP_TCP, 3, 
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_TCP, EPM_PROTOCOL_IP } }, 
+	{ "ncacn_http", NCACN_HTTP, 3, 
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_HTTP, EPM_PROTOCOL_IP } }, 
+	{ "ncadg_ip_udp", NCACN_IP_UDP, 3, 
+		{ EPM_PROTOCOL_NCADG, EPM_PROTOCOL_UDP, EPM_PROTOCOL_IP } },
+	{ "ncalrpc", NCALRPC, 2, 
+		{ EPM_PROTOCOL_NCALRPC, EPM_PROTOCOL_PIPE } },
+	{ "ncacn_unix_stream", NCACN_UNIX_STREAM, 2, 
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_UNIX_DS } },
+	{ "ncadg_unix_dgram", NCADG_UNIX_DGRAM, 2, 
+		{ EPM_PROTOCOL_NCADG, EPM_PROTOCOL_UNIX_DS } },
+	{ "ncacn_at_dsp", NCACN_AT_DSP, 3, 
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_APPLETALK, EPM_PROTOCOL_DSP } },
+	{ "ncadg_at_ddp", NCADG_AT_DDP, 3, 
+		{ EPM_PROTOCOL_NCADG, EPM_PROTOCOL_APPLETALK, EPM_PROTOCOL_DDP } },
+	{ "ncacn_vns_ssp", NCACN_VNS_SPP, 3, 
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_STREETTALK, EPM_PROTOCOL_VINES_SPP } },
+	{ "ncacn_vns_ipc", NCACN_VNS_IPC, 3, 
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_STREETTALK, EPM_PROTOCOL_VINES_IPC }, },
+	{ "ncadg_ipx", NCADG_IPX, 2,
+		{ EPM_PROTOCOL_NCADG, EPM_PROTOCOL_IPX },
+	},
+	{ "ncacn_spx", NCACN_SPX, 3,
+		/* I guess some MS programmer confused the identifier for 
+		 * EPM_PROTOCOL_UUID (0x0D or 13) with the one for 
+		 * EPM_PROTOCOL_SPX (0x13) here. -- jelmer*/
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_NCALRPC, EPM_PROTOCOL_UUID },
+	},
+};
+
+static const struct {
+	const char *name;
+	uint32_t flag;
+} ncacn_options[] = {
+};
+
+const char *epm_floor_string(TALLOC_CTX *mem_ctx, struct epm_floor *epm_floor)
+{
+	struct ndr_syntax_id syntax;
+	NTSTATUS status;
+
+	switch(epm_floor->lhs.protocol) {
+		case EPM_PROTOCOL_UUID:
+			status = dcerpc_floor_get_lhs_data(epm_floor, &syntax);
+			if (NT_STATUS_IS_OK(status)) {
+				/* lhs is used: UUID */
+				char *uuidstr;
+
+				if (GUID_equal(&syntax.uuid, &ndr_transfer_syntax.uuid)) {
+					return "NDR";
+				} 
+
+				if (GUID_equal(&syntax.uuid, &ndr64_transfer_syntax.uuid)) {
+					return "NDR64";
+				} 
+
+				uuidstr = GUID_string(mem_ctx, &syntax.uuid);
+
+				return talloc_asprintf(mem_ctx, " uuid %s/0x%02x", uuidstr, syntax.if_version);
+			} else { /* IPX */
+				return NULL;
+			}
+
+		case EPM_PROTOCOL_NCACN:
+			return "RPC-C";
+
+		case EPM_PROTOCOL_NCADG:
+			return "RPC";
+
+		case EPM_PROTOCOL_NCALRPC:
+			return "NCALRPC";
+
+		case EPM_PROTOCOL_DNET_NSP:
+			return "DNET/NSP";
+
+		case EPM_PROTOCOL_IP:
+			return talloc_asprintf(mem_ctx, "IP:%s", epm_floor->rhs.ip.ipaddr);
+
+		case EPM_PROTOCOL_PIPE:
+			return talloc_asprintf(mem_ctx, "PIPE:%s", epm_floor->rhs.pipe.path);
+
+		case EPM_PROTOCOL_SMB:
+			return talloc_asprintf(mem_ctx, "SMB:%s", epm_floor->rhs.smb.unc);
+
+		case EPM_PROTOCOL_UNIX_DS:
+			return talloc_asprintf(mem_ctx, "Unix:%s", epm_floor->rhs.unix_ds.path);
+
+		case EPM_PROTOCOL_NETBIOS:
+			return talloc_asprintf(mem_ctx, "NetBIOS:%s", epm_floor->rhs.netbios.name);
+
+		case EPM_PROTOCOL_NETBEUI:
+			return "NETBeui";
+
+		case EPM_PROTOCOL_SPX:
+			return "SPX";
+
+		case EPM_PROTOCOL_NB_IPX:
+			return "NB_IPX";
+
+		case EPM_PROTOCOL_HTTP:
+			return talloc_asprintf(mem_ctx, "HTTP:%d", epm_floor->rhs.http.port);
+
+		case EPM_PROTOCOL_TCP:
+			return talloc_asprintf(mem_ctx, "TCP:%d", epm_floor->rhs.tcp.port);
+
+		case EPM_PROTOCOL_UDP:
+			return talloc_asprintf(mem_ctx, "UDP:%d", epm_floor->rhs.udp.port);
+
+		default:
+			return talloc_asprintf(mem_ctx, "UNK(%02x):", epm_floor->lhs.protocol);
+	}
+}
+
+
+/*
+  form a binding string from a binding structure
+*/
+_PUBLIC_ char *dcerpc_binding_string(TALLOC_CTX *mem_ctx, const struct dcerpc_binding *b)
+{
+	char *s = talloc_strdup(mem_ctx, "");
+	int i;
+	const char *t_name = NULL;
+
+	if (b->transport != NCA_UNKNOWN) {
+		for (i=0;i<ARRAY_SIZE(transports);i++) {
+			if (transports[i].transport == b->transport) {
+				t_name = transports[i].name;
+			}
+		}
+		if (!t_name) {
+			return NULL;
+		}
+	}
+
+	if (!GUID_all_zero(&b->object.uuid)) { 
+		s = talloc_asprintf(s, "%s@",
+				    GUID_string(mem_ctx, &b->object.uuid));
+	}
+
+	if (t_name != NULL) {
+		s = talloc_asprintf_append_buffer(s, "%s:", t_name);
+		if (s == NULL) {
+			return NULL;
+		}
+	}
+
+	if (b->host) {
+		s = talloc_asprintf_append_buffer(s, "%s", b->host);
+	}
+
+	if (!b->endpoint && !b->options && !b->flags) {
+		return s;
+	}
+
+	s = talloc_asprintf_append_buffer(s, "[");
+
+	if (b->endpoint) {
+		s = talloc_asprintf_append_buffer(s, "%s", b->endpoint);
+	}
+
+	/* this is a *really* inefficent way of dealing with strings,
+	   but this is rarely called and the strings are always short,
+	   so I don't care */
+	for (i=0;b->options && b->options[i];i++) {
+		s = talloc_asprintf_append_buffer(s, ",%s", b->options[i]);
+		if (!s) return NULL;
+	}
+
+	for (i=0;i<ARRAY_SIZE(ncacn_options);i++) {
+		if (b->flags & ncacn_options[i].flag) {
+			s = talloc_asprintf_append_buffer(s, ",%s", ncacn_options[i].name);
+			if (!s) return NULL;
+		}
+	}
+
+	s = talloc_asprintf_append_buffer(s, "]");
+
+	return s;
+}
+
+/*
+  parse a binding string into a dcerpc_binding structure
+*/
+_PUBLIC_ NTSTATUS dcerpc_parse_binding(TALLOC_CTX *mem_ctx, const char *s, struct dcerpc_binding **b_out)
+{
+	struct dcerpc_binding *b;
+	char *options;
+	char *p;
+	int i, j, comma_count;
+
+	b = talloc(mem_ctx, struct dcerpc_binding);
+	if (!b) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	p = strchr(s, '@');
+
+	if (p && PTR_DIFF(p, s) == 36) { /* 36 is the length of a UUID */
+		NTSTATUS status;
+
+		status = GUID_from_string(s, &b->object.uuid);
+
+		if (NT_STATUS_IS_ERR(status)) {
+			DEBUG(0, ("Failed parsing UUID\n"));
+			return status;
+		}
+
+		s = p + 1;
+	} else {
+		ZERO_STRUCT(b->object);
+	}
+
+	b->object.if_version = 0;
+
+	p = strchr(s, ':');
+
+	if (p == NULL) {
+		b->transport = NCA_UNKNOWN;
+	} else {
+		char *type = talloc_strndup(mem_ctx, s, PTR_DIFF(p, s));
+		if (!type) {
+			return NT_STATUS_NO_MEMORY;
+		}
+
+		for (i=0;i<ARRAY_SIZE(transports);i++) {
+			if (strcmp(type, transports[i].name) == 0) {
+				b->transport = transports[i].transport;
+				break;
+			}
+		}
+
+		if (i==ARRAY_SIZE(transports)) {
+			DEBUG(0,("Unknown dcerpc transport '%s'\n", type));
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+
+		talloc_free(type);
+	
+		s = p+1;
+	}
+
+	p = strchr(s, '[');
+	if (p) {
+		b->host = talloc_strndup(b, s, PTR_DIFF(p, s));
+		options = talloc_strdup(mem_ctx, p+1);
+		if (options[strlen(options)-1] != ']') {
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+		options[strlen(options)-1] = 0;
+	} else {
+		b->host = talloc_strdup(b, s);
+		options = NULL;
+	}
+	if (!b->host) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	b->target_hostname = b->host;
+
+	b->options = NULL;
+	b->flags = 0;
+	b->assoc_group_id = 0;
+	b->endpoint = NULL;
+
+	if (!options) {
+		*b_out = b;
+		return NT_STATUS_OK;
+	}
+
+	comma_count = count_chars(options, ',');
+
+	b->options = talloc_array(b, const char *, comma_count+2);
+	if (!b->options) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	for (i=0; (p = strchr(options, ',')); i++) {
+		b->options[i] = talloc_strndup(b, options, PTR_DIFF(p, options));
+		if (!b->options[i]) {
+			return NT_STATUS_NO_MEMORY;
+		}
+		options = p+1;
+	}
+	b->options[i] = options;
+	b->options[i+1] = NULL;
+
+	/* some options are pre-parsed for convenience */
+	for (i=0;b->options[i];i++) {
+		for (j=0;j<ARRAY_SIZE(ncacn_options);j++) {
+			if (strcmp(ncacn_options[j].name, b->options[i]) == 0) {
+				int k;
+				b->flags |= ncacn_options[j].flag;
+				for (k=i;b->options[k];k++) {
+					b->options[k] = b->options[k+1];
+				}
+				i--;
+				break;
+			}
+		}
+	}
+
+	if (b->options[0]) {
+		/* Endpoint is first option */
+		b->endpoint = b->options[0];
+		if (strlen(b->endpoint) == 0) b->endpoint = NULL;
+
+		for (i=0;b->options[i];i++) {
+			b->options[i] = b->options[i+1];
+		}
+	}
+
+	if (b->options[0] == NULL)
+		b->options = NULL;
+	
+	*b_out = b;
+	return NT_STATUS_OK;
+}
+
+_PUBLIC_ NTSTATUS dcerpc_floor_get_lhs_data(struct epm_floor *epm_floor, struct ndr_syntax_id *syntax)
+{
+	TALLOC_CTX *mem_ctx = talloc_init("floor_get_lhs_data");
+	struct ndr_pull *ndr = ndr_pull_init_blob(&epm_floor->lhs.lhs_data, mem_ctx);
+	enum ndr_err_code ndr_err;
+	uint16_t if_version=0;
+
+	ndr->flags |= LIBNDR_FLAG_NOALIGN;
+
+	ndr_err = ndr_pull_GUID(ndr, NDR_SCALARS | NDR_BUFFERS, &syntax->uuid);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		talloc_free(mem_ctx);
+		return ndr_map_error2ntstatus(ndr_err);
+	}
+
+	ndr_err = ndr_pull_uint16(ndr, NDR_SCALARS, &if_version);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		talloc_free(mem_ctx);
+		return ndr_map_error2ntstatus(ndr_err);
+	}
+
+	syntax->if_version = if_version;
+
+	talloc_free(mem_ctx);
+
+	return NT_STATUS_OK;
+}
+
+static DATA_BLOB dcerpc_floor_pack_lhs_data(TALLOC_CTX *mem_ctx, const struct ndr_syntax_id *syntax)
+{
+	struct ndr_push *ndr = ndr_push_init_ctx(mem_ctx);
+
+	ndr->flags |= LIBNDR_FLAG_NOALIGN;
+
+	ndr_push_GUID(ndr, NDR_SCALARS | NDR_BUFFERS, &syntax->uuid);
+	ndr_push_uint16(ndr, NDR_SCALARS, syntax->if_version);
+
+	return ndr_push_blob(ndr);
+}
+
+const char *dcerpc_floor_get_rhs_data(TALLOC_CTX *mem_ctx, struct epm_floor *epm_floor)
+{
+	switch (epm_floor->lhs.protocol) {
+	case EPM_PROTOCOL_TCP:
+		if (epm_floor->rhs.tcp.port == 0) return NULL;
+		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.tcp.port);
+		
+	case EPM_PROTOCOL_UDP:
+		if (epm_floor->rhs.udp.port == 0) return NULL;
+		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.udp.port);
+
+	case EPM_PROTOCOL_HTTP:
+		if (epm_floor->rhs.http.port == 0) return NULL;
+		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.http.port);
+
+	case EPM_PROTOCOL_IP:
+		return talloc_strdup(mem_ctx, epm_floor->rhs.ip.ipaddr);
+
+	case EPM_PROTOCOL_NCACN:
+		return NULL;
+
+	case EPM_PROTOCOL_NCADG:
+		return NULL;
+
+	case EPM_PROTOCOL_SMB:
+		if (strlen(epm_floor->rhs.smb.unc) == 0) return NULL;
+		return talloc_strdup(mem_ctx, epm_floor->rhs.smb.unc);
+
+	case EPM_PROTOCOL_PIPE:
+		if (strlen(epm_floor->rhs.pipe.path) == 0) return NULL;
+		return talloc_strdup(mem_ctx, epm_floor->rhs.pipe.path);
+
+	case EPM_PROTOCOL_NETBIOS:
+		if (strlen(epm_floor->rhs.netbios.name) == 0) return NULL;
+		return talloc_strdup(mem_ctx, epm_floor->rhs.netbios.name);
+
+	case EPM_PROTOCOL_NCALRPC:
+		return NULL;
+		
+	case EPM_PROTOCOL_VINES_SPP:
+		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.vines_spp.port);
+		
+	case EPM_PROTOCOL_VINES_IPC:
+		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.vines_ipc.port);
+		
+	case EPM_PROTOCOL_STREETTALK:
+		return talloc_strdup(mem_ctx, epm_floor->rhs.streettalk.streettalk);
+		
+	case EPM_PROTOCOL_UNIX_DS:
+		if (strlen(epm_floor->rhs.unix_ds.path) == 0) return NULL;
+		return talloc_strdup(mem_ctx, epm_floor->rhs.unix_ds.path);
+		
+	case EPM_PROTOCOL_NULL:
+		return NULL;
+
+	default:
+		DEBUG(0,("Unsupported lhs protocol %d\n", epm_floor->lhs.protocol));
+		break;
+	}
+
+	return NULL;
+}
+
+static NTSTATUS dcerpc_floor_set_rhs_data(TALLOC_CTX *mem_ctx, 
+					  struct epm_floor *epm_floor,  
+					  const char *data)
+{
+	switch (epm_floor->lhs.protocol) {
+	case EPM_PROTOCOL_TCP:
+		epm_floor->rhs.tcp.port = atoi(data);
+		return NT_STATUS_OK;
+		
+	case EPM_PROTOCOL_UDP:
+		epm_floor->rhs.udp.port = atoi(data);
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_HTTP:
+		epm_floor->rhs.http.port = atoi(data);
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_IP:
+		epm_floor->rhs.ip.ipaddr = talloc_strdup(mem_ctx, data);
+		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.ip.ipaddr);
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_NCACN:
+		epm_floor->rhs.ncacn.minor_version = 0;
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_NCADG:
+		epm_floor->rhs.ncadg.minor_version = 0;
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_SMB:
+		epm_floor->rhs.smb.unc = talloc_strdup(mem_ctx, data);
+		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.smb.unc);
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_PIPE:
+		epm_floor->rhs.pipe.path = talloc_strdup(mem_ctx, data);
+		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.pipe.path);
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_NETBIOS:
+		epm_floor->rhs.netbios.name = talloc_strdup(mem_ctx, data);
+		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.netbios.name);
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_NCALRPC:
+		return NT_STATUS_OK;
+		
+	case EPM_PROTOCOL_VINES_SPP:
+		epm_floor->rhs.vines_spp.port = atoi(data);
+		return NT_STATUS_OK;
+		
+	case EPM_PROTOCOL_VINES_IPC:
+		epm_floor->rhs.vines_ipc.port = atoi(data);
+		return NT_STATUS_OK;
+		
+	case EPM_PROTOCOL_STREETTALK:
+		epm_floor->rhs.streettalk.streettalk = talloc_strdup(mem_ctx, data);
+		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.streettalk.streettalk);
+		return NT_STATUS_OK;
+		
+	case EPM_PROTOCOL_UNIX_DS:
+		epm_floor->rhs.unix_ds.path = talloc_strdup(mem_ctx, data);
+		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.unix_ds.path);
+		return NT_STATUS_OK;
+		
+	case EPM_PROTOCOL_NULL:
+		return NT_STATUS_OK;
+
+	default:
+		DEBUG(0,("Unsupported lhs protocol %d\n", epm_floor->lhs.protocol));
+		break;
+	}
+
+	return NT_STATUS_NOT_SUPPORTED;
+}
+
+enum dcerpc_transport_t dcerpc_transport_by_endpoint_protocol(int prot)
+{
+	int i;
+
+	/* Find a transport that has 'prot' as 4th protocol */
+	for (i=0;i<ARRAY_SIZE(transports);i++) {
+		if (transports[i].num_protocols >= 2 && 
+			transports[i].protseq[1] == prot) {
+			return transports[i].transport;
+		}
+	}
+	
+	/* Unknown transport */
+	return (unsigned int)-1;
+}
+
+_PUBLIC_ enum dcerpc_transport_t dcerpc_transport_by_tower(struct epm_tower *tower)
+{
+	int i;
+
+	/* Find a transport that matches this tower */
+	for (i=0;i<ARRAY_SIZE(transports);i++) {
+		int j;
+		if (transports[i].num_protocols != tower->num_floors - 2) {
+			continue; 
+		}
+
+		for (j = 0; j < transports[i].num_protocols; j++) {
+			if (transports[i].protseq[j] != tower->floors[j+2].lhs.protocol) {
+				break;
+			}
+		}
+
+		if (j == transports[i].num_protocols) {
+			return transports[i].transport;
+		}
+	}
+	
+	/* Unknown transport */
+	return (unsigned int)-1;
+}
+
+_PUBLIC_ NTSTATUS dcerpc_binding_from_tower(TALLOC_CTX *mem_ctx, 
+				   struct epm_tower *tower, 
+				   struct dcerpc_binding **b_out)
+{
+	NTSTATUS status;
+	struct dcerpc_binding *binding;
+
+	binding = talloc(mem_ctx, struct dcerpc_binding);
+	NT_STATUS_HAVE_NO_MEMORY(binding);
+
+	ZERO_STRUCT(binding->object);
+	binding->options = NULL;
+	binding->host = NULL;
+	binding->target_hostname = NULL;
+	binding->flags = 0;
+	binding->assoc_group_id = 0;
+
+	binding->transport = dcerpc_transport_by_tower(tower);
+
+	if (binding->transport == (unsigned int)-1) {
+		return NT_STATUS_NOT_SUPPORTED;
+	}
+
+	if (tower->num_floors < 1) {
+		return NT_STATUS_OK;
+	}
+
+	/* Set object uuid */
+	status = dcerpc_floor_get_lhs_data(&tower->floors[0], &binding->object);
+	
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("Error pulling object uuid and version: %s", nt_errstr(status)));	
+		return status;
+	}
+
+	/* Ignore floor 1, it contains the NDR version info */
+	
+	binding->options = NULL;
+
+	/* Set endpoint */
+	if (tower->num_floors >= 4) {
+		binding->endpoint = dcerpc_floor_get_rhs_data(mem_ctx, &tower->floors[3]);
+	} else {
+		binding->endpoint = NULL;
+	}
+
+	/* Set network address */
+	if (tower->num_floors >= 5) {
+		binding->host = dcerpc_floor_get_rhs_data(mem_ctx, &tower->floors[4]);
+		NT_STATUS_HAVE_NO_MEMORY(binding->host);
+		binding->target_hostname = binding->host;
+	}
+	*b_out = binding;
+	return NT_STATUS_OK;
+}
+
+_PUBLIC_ NTSTATUS dcerpc_binding_build_tower(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding, struct epm_tower *tower)
+{
+	const enum epm_protocol *protseq = NULL;
+	int num_protocols = -1, i;
+	NTSTATUS status;
+	
+	/* Find transport */
+	for (i=0;i<ARRAY_SIZE(transports);i++) {
+		if (transports[i].transport == binding->transport) {
+			protseq = transports[i].protseq;
+			num_protocols = transports[i].num_protocols;
+			break;
+		}
+	}
+
+	if (num_protocols == -1) {
+		DEBUG(0, ("Unable to find transport with id '%d'\n", binding->transport));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	tower->num_floors = 2 + num_protocols;
+	tower->floors = talloc_array(mem_ctx, struct epm_floor, tower->num_floors);
+
+	/* Floor 0 */
+	tower->floors[0].lhs.protocol = EPM_PROTOCOL_UUID;
+
+	tower->floors[0].lhs.lhs_data = dcerpc_floor_pack_lhs_data(mem_ctx, &binding->object);
+
+	tower->floors[0].rhs.uuid.unknown = data_blob_talloc_zero(mem_ctx, 2);
+	
+	/* Floor 1 */
+	tower->floors[1].lhs.protocol = EPM_PROTOCOL_UUID;
+
+	tower->floors[1].lhs.lhs_data = dcerpc_floor_pack_lhs_data(mem_ctx, 
+								&ndr_transfer_syntax);
+	
+	tower->floors[1].rhs.uuid.unknown = data_blob_talloc_zero(mem_ctx, 2);
+	
+	/* Floor 2 to num_protocols */
+	for (i = 0; i < num_protocols; i++) {
+		tower->floors[2 + i].lhs.protocol = protseq[i];
+		tower->floors[2 + i].lhs.lhs_data = data_blob_talloc(mem_ctx, NULL, 0);
+		ZERO_STRUCT(tower->floors[2 + i].rhs);
+		dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[2 + i], "");
+	}
+
+	/* The 4th floor contains the endpoint */
+	if (num_protocols >= 2 && binding->endpoint) {
+		status = dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[3], binding->endpoint);
+		if (NT_STATUS_IS_ERR(status)) {
+			return status;
+		}
+	}
+	
+	/* The 5th contains the network address */
+	if (num_protocols >= 3 && binding->host) {
+		if (is_ipaddress(binding->host)) {
+			status = dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[4], 
+							   binding->host);
+		} else {
+			/* note that we don't attempt to resolve the
+			   name here - when we get a hostname here we
+			   are in the client code, and want to put in
+			   a wildcard all-zeros IP for the server to
+			   fill in */
+			status = dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[4], 
+							   "0.0.0.0");
+		}
+		if (NT_STATUS_IS_ERR(status)) {
+			return status;
+		}
+	}
+
+	return NT_STATUS_OK;
+}
diff --git a/source3/librpc/rpc/dcerpc.c b/source3/librpc/rpc/dcerpc.c
new file mode 100644
index 0000000000..7609757417
--- /dev/null
+++ b/source3/librpc/rpc/dcerpc.c
@@ -0,0 +1,146 @@
+/* 
+   Unix SMB/CIFS implementation.
+   Samba utility functions
+   Copyright (C) Jelmer Vernooij <jelmer@samba.org> 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 "librpc/rpc/dcerpc.h"
+
+struct rpc_request *dcerpc_ndr_request_send(struct dcerpc_pipe *p, const struct GUID *object, 
+					    const struct ndr_interface_table *table, uint32_t opnum, 
+					    TALLOC_CTX *mem_ctx, void *r)
+{
+	const struct ndr_interface_call *call;
+	struct ndr_push *push;
+	struct rpc_request *ret = talloc(mem_ctx, struct rpc_request);
+	enum ndr_err_code ndr_err;
+	DATA_BLOB blob;
+
+	if (ret == NULL)
+		return NULL;
+
+	SMB_ASSERT(p->table->num_calls > opnum);
+
+	call = &p->table->calls[opnum];
+
+	ret->call = call;
+	ret->r = r;
+
+	push = ndr_push_init_ctx(mem_ctx);
+	if (!push) {
+		return NULL;
+	}
+
+	ndr_err = call->ndr_push(push, NDR_IN, r);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		/* FIXME: ndr_map_error2ntstatus(ndr_err); */
+		return NULL;
+	}
+
+	blob = ndr_push_blob(push);
+
+	if (!prs_init_data_blob(&ret->q_ps, &blob, mem_ctx)) {
+		return NULL;
+	}
+
+	talloc_free(push);
+
+	ret->opnum = opnum;
+
+	return ret;
+}
+
+NTSTATUS dcerpc_ndr_request_recv(struct rpc_request *req)
+{
+	prs_struct r_ps;
+	struct ndr_pull *pull;
+	NTSTATUS status;
+	DATA_BLOB blob;
+	enum ndr_err_code ndr_err;
+
+	prs_init_empty( &r_ps, req, UNMARSHALL );
+
+	status = rpc_api_pipe_req(req->pipe->cli, req->opnum, &req->q_ps, &r_ps); 
+
+	prs_mem_free( &req->q_ps );
+
+	if (!NT_STATUS_IS_OK(status)) {
+		prs_mem_free( &r_ps );
+		return status;
+	}
+
+	if (!prs_data_blob(&r_ps, &blob, req)) {
+		prs_mem_free( &r_ps );
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	prs_mem_free( &r_ps );
+
+	pull = ndr_pull_init_blob(&blob, req);
+	if (pull == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	/* have the ndr parser alloc memory for us */
+	pull->flags |= LIBNDR_FLAG_REF_ALLOC;
+	ndr_err = req->call->ndr_pull(pull, NDR_OUT, req->r);
+	talloc_free(pull);
+
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		return ndr_map_error2ntstatus(ndr_err);
+	}
+
+
+
+	return NT_STATUS_NOT_IMPLEMENTED;
+}
+
+_PUBLIC_ NTSTATUS dcerpc_pipe_connect(TALLOC_CTX *parent_ctx, struct dcerpc_pipe **pp, 
+				      const char *binding_string, const struct ndr_interface_table *table, 
+				      struct cli_credentials *credentials, struct event_context *ev, 
+				      struct loadparm_context *lp_ctx)
+{
+	struct dcerpc_pipe *p = talloc(parent_ctx, struct dcerpc_pipe);
+	struct dcerpc_binding *binding;
+	NTSTATUS nt_status;
+
+	nt_status = dcerpc_parse_binding(p, binding_string, &binding);
+
+	if (NT_STATUS_IS_ERR(nt_status)) {
+		DEBUG(1, ("Unable to parse binding string '%s'", binding));
+		return nt_status;
+	}
+
+	/* FIXME: Actually use loadparm_context.. */
+
+	/* FIXME: actually use credentials */
+
+	nt_status = cli_full_connection(&p->cli, global_myname(), binding->host,
+					NULL, 0, 
+					"IPC$", "IPC",
+					get_cmdline_auth_info_username(),
+					lp_workgroup(),
+					get_cmdline_auth_info_password(),
+					get_cmdline_auth_info_use_kerberos() ? CLI_FULL_CONNECTION_USE_KERBEROS : 0,
+					get_cmdline_auth_info_signing_state(), NULL);
+
+	p->table = table;
+
+	*pp = p;
+
+	return nt_status;
+}
diff --git a/source3/librpc/rpc/dcerpc.h b/source3/librpc/rpc/dcerpc.h
new file mode 100644
index 0000000000..9e2bd9b4f6
--- /dev/null
+++ b/source3/librpc/rpc/dcerpc.h
@@ -0,0 +1,70 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   DCERPC client side interface structures
+
+   Copyright (C) 2008 Jelmer Vernooij
+   
+   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/>.
+*/
+
+/* This is a public header file that is installed as part of Samba. 
+ * If you remove any functions or change their signature, update 
+ * the so version number. */
+
+#ifndef __DCERPC_H__
+#define __DCERPC_H__
+
+#include "includes.h"
+#include "librpc/rpc/dcerpc.h"
+#include "librpc/gen_ndr/epmapper.h"
+
+struct loadparm_context;
+struct cli_credentials;
+
+struct dcerpc_pipe {
+	const struct ndr_interface_table *table;
+	struct rpc_pipe_client *cli;
+};
+
+struct rpc_request {
+	const struct ndr_interface_call *call;
+	prs_struct q_ps;
+	uint32_t opnum;
+	struct dcerpc_pipe *pipe;
+	void *r;
+};
+
+enum dcerpc_transport_t {
+	NCA_UNKNOWN, NCACN_NP, NCACN_IP_TCP, NCACN_IP_UDP, NCACN_VNS_IPC, 
+	NCACN_VNS_SPP, NCACN_AT_DSP, NCADG_AT_DDP, NCALRPC, NCACN_UNIX_STREAM, 
+	NCADG_UNIX_DGRAM, NCACN_HTTP, NCADG_IPX, NCACN_SPX };
+
+
+/* this describes a binding to a particular transport/pipe */
+struct dcerpc_binding {
+	enum dcerpc_transport_t transport;
+	struct ndr_syntax_id object;
+	const char *host;
+	const char *target_hostname;
+	const char *endpoint;
+	const char **options;
+	uint32_t flags;
+	uint32_t assoc_group_id;
+};
+
+
+
+
+#endif /* __DCERPC_H__ */
diff --git a/source3/librpc/rpc/dcerpc_util.c b/source3/librpc/rpc/dcerpc_util.c
new file mode 100644
index 0000000000..3b8768ccc2
--- /dev/null
+++ b/source3/librpc/rpc/dcerpc_util.c
@@ -0,0 +1,1438 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   dcerpc utility functions
+
+   Copyright (C) Andrew Tridgell 2003
+   Copyright (C) Jelmer Vernooij 2004
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
+   Copyright (C) Rafal Szczesniak 2006
+   
+   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/events/events.h"
+#include "libcli/composite/composite.h"
+#include "librpc/gen_ndr/ndr_epmapper_c.h"
+#include "librpc/gen_ndr/ndr_dcerpc.h"
+#include "librpc/gen_ndr/ndr_misc.h"
+#include "librpc/rpc/dcerpc_proto.h"
+#include "auth/credentials/credentials.h"
+#include "param/param.h"
+
+/*
+  find a dcerpc call on an interface by name
+*/
+const struct ndr_interface_call *dcerpc_iface_find_call(const struct ndr_interface_table *iface,
+							const char *name)
+{
+	int i;
+	for (i=0;i<iface->num_calls;i++) {
+		if (strcmp(iface->calls[i].name, name) == 0) {
+			return &iface->calls[i];
+		}
+	}
+	return NULL;
+}
+
+/* 
+   push a ncacn_packet into a blob, potentially with auth info
+*/
+NTSTATUS ncacn_push_auth(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, 
+			 struct smb_iconv_convenience *iconv_convenience,
+			  struct ncacn_packet *pkt,
+			  struct dcerpc_auth *auth_info)
+{
+	struct ndr_push *ndr;
+	enum ndr_err_code ndr_err;
+
+	ndr = ndr_push_init_ctx(mem_ctx, iconv_convenience);
+	if (!ndr) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
+		ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
+	}
+
+	if (pkt->pfc_flags & DCERPC_PFC_FLAG_OBJECT_UUID) {
+		ndr->flags |= LIBNDR_FLAG_OBJECT_PRESENT;
+	}
+
+	if (auth_info) {
+		pkt->auth_length = auth_info->credentials.length;
+	} else {
+		pkt->auth_length = 0;
+	}
+
+	ndr_err = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		return ndr_map_error2ntstatus(ndr_err);
+	}
+
+	if (auth_info) {
+		ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, auth_info);
+		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+			return ndr_map_error2ntstatus(ndr_err);
+		}
+	}
+
+	*blob = ndr_push_blob(ndr);
+
+	/* fill in the frag length */
+	dcerpc_set_frag_length(blob, blob->length);
+
+	return NT_STATUS_OK;
+}
+
+#define MAX_PROTSEQ		10
+
+static const struct {
+	const char *name;
+	enum dcerpc_transport_t transport;
+	int num_protocols;
+	enum epm_protocol protseq[MAX_PROTSEQ];
+} transports[] = {
+	{ "ncacn_np",     NCACN_NP, 3, 
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_SMB, EPM_PROTOCOL_NETBIOS }},
+	{ "ncacn_ip_tcp", NCACN_IP_TCP, 3, 
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_TCP, EPM_PROTOCOL_IP } }, 
+	{ "ncacn_http", NCACN_HTTP, 3, 
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_HTTP, EPM_PROTOCOL_IP } }, 
+	{ "ncadg_ip_udp", NCACN_IP_UDP, 3, 
+		{ EPM_PROTOCOL_NCADG, EPM_PROTOCOL_UDP, EPM_PROTOCOL_IP } },
+	{ "ncalrpc", NCALRPC, 2, 
+		{ EPM_PROTOCOL_NCALRPC, EPM_PROTOCOL_PIPE } },
+	{ "ncacn_unix_stream", NCACN_UNIX_STREAM, 2, 
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_UNIX_DS } },
+	{ "ncadg_unix_dgram", NCADG_UNIX_DGRAM, 2, 
+		{ EPM_PROTOCOL_NCADG, EPM_PROTOCOL_UNIX_DS } },
+	{ "ncacn_at_dsp", NCACN_AT_DSP, 3, 
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_APPLETALK, EPM_PROTOCOL_DSP } },
+	{ "ncadg_at_ddp", NCADG_AT_DDP, 3, 
+		{ EPM_PROTOCOL_NCADG, EPM_PROTOCOL_APPLETALK, EPM_PROTOCOL_DDP } },
+	{ "ncacn_vns_ssp", NCACN_VNS_SPP, 3, 
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_STREETTALK, EPM_PROTOCOL_VINES_SPP } },
+	{ "ncacn_vns_ipc", NCACN_VNS_IPC, 3, 
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_STREETTALK, EPM_PROTOCOL_VINES_IPC }, },
+	{ "ncadg_ipx", NCADG_IPX, 2,
+		{ EPM_PROTOCOL_NCADG, EPM_PROTOCOL_IPX },
+	},
+	{ "ncacn_spx", NCACN_SPX, 3,
+		/* I guess some MS programmer confused the identifier for 
+		 * EPM_PROTOCOL_UUID (0x0D or 13) with the one for 
+		 * EPM_PROTOCOL_SPX (0x13) here. -- jelmer*/
+		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_NCALRPC, EPM_PROTOCOL_UUID },
+	},
+};
+
+static const struct {
+	const char *name;
+	uint32_t flag;
+} ncacn_options[] = {
+	{"sign", DCERPC_SIGN},
+	{"seal", DCERPC_SEAL},
+	{"connect", DCERPC_CONNECT},
+	{"spnego", DCERPC_AUTH_SPNEGO},
+	{"ntlm", DCERPC_AUTH_NTLM},
+	{"krb5", DCERPC_AUTH_KRB5},
+	{"validate", DCERPC_DEBUG_VALIDATE_BOTH},
+	{"print", DCERPC_DEBUG_PRINT_BOTH},
+	{"padcheck", DCERPC_DEBUG_PAD_CHECK},
+	{"bigendian", DCERPC_PUSH_BIGENDIAN},
+	{"smb2", DCERPC_SMB2}
+};
+
+const char *epm_floor_string(TALLOC_CTX *mem_ctx, struct epm_floor *epm_floor)
+{
+	struct ndr_syntax_id syntax;
+	NTSTATUS status;
+
+	switch(epm_floor->lhs.protocol) {
+		case EPM_PROTOCOL_UUID:
+			status = dcerpc_floor_get_lhs_data(epm_floor, &syntax);
+			if (NT_STATUS_IS_OK(status)) {
+				/* lhs is used: UUID */
+				char *uuidstr;
+
+				if (GUID_equal(&syntax.uuid, &ndr_transfer_syntax.uuid)) {
+					return "NDR";
+				} 
+
+				if (GUID_equal(&syntax.uuid, &ndr64_transfer_syntax.uuid)) {
+					return "NDR64";
+				} 
+
+				uuidstr = GUID_string(mem_ctx, &syntax.uuid);
+
+				return talloc_asprintf(mem_ctx, " uuid %s/0x%02x", uuidstr, syntax.if_version);
+			} else { /* IPX */
+				return talloc_asprintf(mem_ctx, "IPX:%s", 
+						data_blob_hex_string(mem_ctx, &epm_floor->rhs.uuid.unknown));
+			}
+
+		case EPM_PROTOCOL_NCACN:
+			return "RPC-C";
+
+		case EPM_PROTOCOL_NCADG:
+			return "RPC";
+
+		case EPM_PROTOCOL_NCALRPC:
+			return "NCALRPC";
+
+		case EPM_PROTOCOL_DNET_NSP:
+			return "DNET/NSP";
+
+		case EPM_PROTOCOL_IP:
+			return talloc_asprintf(mem_ctx, "IP:%s", epm_floor->rhs.ip.ipaddr);
+
+		case EPM_PROTOCOL_PIPE:
+			return talloc_asprintf(mem_ctx, "PIPE:%s", epm_floor->rhs.pipe.path);
+
+		case EPM_PROTOCOL_SMB:
+			return talloc_asprintf(mem_ctx, "SMB:%s", epm_floor->rhs.smb.unc);
+
+		case EPM_PROTOCOL_UNIX_DS:
+			return talloc_asprintf(mem_ctx, "Unix:%s", epm_floor->rhs.unix_ds.path);
+
+		case EPM_PROTOCOL_NETBIOS:
+			return talloc_asprintf(mem_ctx, "NetBIOS:%s", epm_floor->rhs.netbios.name);
+
+		case EPM_PROTOCOL_NETBEUI:
+			return "NETBeui";
+
+		case EPM_PROTOCOL_SPX:
+			return "SPX";
+
+		case EPM_PROTOCOL_NB_IPX:
+			return "NB_IPX";
+
+		case EPM_PROTOCOL_HTTP:
+			return talloc_asprintf(mem_ctx, "HTTP:%d", epm_floor->rhs.http.port);
+
+		case EPM_PROTOCOL_TCP:
+			return talloc_asprintf(mem_ctx, "TCP:%d", epm_floor->rhs.tcp.port);
+
+		case EPM_PROTOCOL_UDP:
+			return talloc_asprintf(mem_ctx, "UDP:%d", epm_floor->rhs.udp.port);
+
+		default:
+			return talloc_asprintf(mem_ctx, "UNK(%02x):", epm_floor->lhs.protocol);
+	}
+}
+
+
+/*
+  form a binding string from a binding structure
+*/
+_PUBLIC_ char *dcerpc_binding_string(TALLOC_CTX *mem_ctx, const struct dcerpc_binding *b)
+{
+	char *s = talloc_strdup(mem_ctx, "");
+	int i;
+	const char *t_name = NULL;
+
+	if (b->transport != NCA_UNKNOWN) {
+		for (i=0;i<ARRAY_SIZE(transports);i++) {
+			if (transports[i].transport == b->transport) {
+				t_name = transports[i].name;
+			}
+		}
+		if (!t_name) {
+			return NULL;
+		}
+	}
+
+	if (!GUID_all_zero(&b->object.uuid)) { 
+		s = talloc_asprintf(s, "%s@",
+				    GUID_string(mem_ctx, &b->object.uuid));
+	}
+
+	if (t_name != NULL) {
+		s = talloc_asprintf_append_buffer(s, "%s:", t_name);
+		if (s == NULL) {
+			return NULL;
+		}
+	}
+
+	if (b->host) {
+		s = talloc_asprintf_append_buffer(s, "%s", b->host);
+	}
+
+	if (!b->endpoint && !b->options && !b->flags) {
+		return s;
+	}
+
+	s = talloc_asprintf_append_buffer(s, "[");
+
+	if (b->endpoint) {
+		s = talloc_asprintf_append_buffer(s, "%s", b->endpoint);
+	}
+
+	/* this is a *really* inefficent way of dealing with strings,
+	   but this is rarely called and the strings are always short,
+	   so I don't care */
+	for (i=0;b->options && b->options[i];i++) {
+		s = talloc_asprintf_append_buffer(s, ",%s", b->options[i]);
+		if (!s) return NULL;
+	}
+
+	for (i=0;i<ARRAY_SIZE(ncacn_options);i++) {
+		if (b->flags & ncacn_options[i].flag) {
+			s = talloc_asprintf_append_buffer(s, ",%s", ncacn_options[i].name);
+			if (!s) return NULL;
+		}
+	}
+
+	s = talloc_asprintf_append_buffer(s, "]");
+
+	return s;
+}
+
+/*
+  parse a binding string into a dcerpc_binding structure
+*/
+_PUBLIC_ NTSTATUS dcerpc_parse_binding(TALLOC_CTX *mem_ctx, const char *s, struct dcerpc_binding **b_out)
+{
+	struct dcerpc_binding *b;
+	char *options;
+	char *p;
+	int i, j, comma_count;
+
+	b = talloc(mem_ctx, struct dcerpc_binding);
+	if (!b) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	p = strchr(s, '@');
+
+	if (p && PTR_DIFF(p, s) == 36) { /* 36 is the length of a UUID */
+		NTSTATUS status;
+
+		status = GUID_from_string(s, &b->object.uuid);
+
+		if (NT_STATUS_IS_ERR(status)) {
+			DEBUG(0, ("Failed parsing UUID\n"));
+			return status;
+		}
+
+		s = p + 1;
+	} else {
+		ZERO_STRUCT(b->object);
+	}
+
+	b->object.if_version = 0;
+
+	p = strchr(s, ':');
+
+	if (p == NULL) {
+		b->transport = NCA_UNKNOWN;
+	} else {
+		char *type = talloc_strndup(mem_ctx, s, PTR_DIFF(p, s));
+		if (!type) {
+			return NT_STATUS_NO_MEMORY;
+		}
+
+		for (i=0;i<ARRAY_SIZE(transports);i++) {
+			if (strcasecmp(type, transports[i].name) == 0) {
+				b->transport = transports[i].transport;
+				break;
+			}
+		}
+
+		if (i==ARRAY_SIZE(transports)) {
+			DEBUG(0,("Unknown dcerpc transport '%s'\n", type));
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+
+		talloc_free(type);
+	
+		s = p+1;
+	}
+
+	p = strchr(s, '[');
+	if (p) {
+		b->host = talloc_strndup(b, s, PTR_DIFF(p, s));
+		options = talloc_strdup(mem_ctx, p+1);
+		if (options[strlen(options)-1] != ']') {
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+		options[strlen(options)-1] = 0;
+	} else {
+		b->host = talloc_strdup(b, s);
+		options = NULL;
+	}
+	if (!b->host) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	b->target_hostname = b->host;
+
+	b->options = NULL;
+	b->flags = 0;
+	b->assoc_group_id = 0;
+	b->endpoint = NULL;
+
+	if (!options) {
+		*b_out = b;
+		return NT_STATUS_OK;
+	}
+
+	comma_count = count_chars(options, ',');
+
+	b->options = talloc_array(b, const char *, comma_count+2);
+	if (!b->options) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	for (i=0; (p = strchr(options, ',')); i++) {
+		b->options[i] = talloc_strndup(b, options, PTR_DIFF(p, options));
+		if (!b->options[i]) {
+			return NT_STATUS_NO_MEMORY;
+		}
+		options = p+1;
+	}
+	b->options[i] = options;
+	b->options[i+1] = NULL;
+
+	/* some options are pre-parsed for convenience */
+	for (i=0;b->options[i];i++) {
+		for (j=0;j<ARRAY_SIZE(ncacn_options);j++) {
+			if (strcasecmp(ncacn_options[j].name, b->options[i]) == 0) {
+				int k;
+				b->flags |= ncacn_options[j].flag;
+				for (k=i;b->options[k];k++) {
+					b->options[k] = b->options[k+1];
+				}
+				i--;
+				break;
+			}
+		}
+	}
+
+	if (b->options[0]) {
+		/* Endpoint is first option */
+		b->endpoint = b->options[0];
+		if (strlen(b->endpoint) == 0) b->endpoint = NULL;
+
+		for (i=0;b->options[i];i++) {
+			b->options[i] = b->options[i+1];
+		}
+	}
+
+	if (b->options[0] == NULL)
+		b->options = NULL;
+	
+	*b_out = b;
+	return NT_STATUS_OK;
+}
+
+_PUBLIC_ NTSTATUS dcerpc_floor_get_lhs_data(struct epm_floor *epm_floor, struct ndr_syntax_id *syntax)
+{
+	TALLOC_CTX *mem_ctx = talloc_init("floor_get_lhs_data");
+	struct ndr_pull *ndr = ndr_pull_init_blob(&epm_floor->lhs.lhs_data, mem_ctx, NULL);
+	enum ndr_err_code ndr_err;
+	uint16_t if_version=0;
+
+	ndr->flags |= LIBNDR_FLAG_NOALIGN;
+
+	ndr_err = ndr_pull_GUID(ndr, NDR_SCALARS | NDR_BUFFERS, &syntax->uuid);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		talloc_free(mem_ctx);
+		return ndr_map_error2ntstatus(ndr_err);
+	}
+
+	ndr_err = ndr_pull_uint16(ndr, NDR_SCALARS, &if_version);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		talloc_free(mem_ctx);
+		return ndr_map_error2ntstatus(ndr_err);
+	}
+
+	syntax->if_version = if_version;
+
+	talloc_free(mem_ctx);
+
+	return NT_STATUS_OK;
+}
+
+static DATA_BLOB dcerpc_floor_pack_lhs_data(TALLOC_CTX *mem_ctx, const struct ndr_syntax_id *syntax)
+{
+	struct ndr_push *ndr = ndr_push_init_ctx(mem_ctx, NULL);
+
+	ndr->flags |= LIBNDR_FLAG_NOALIGN;
+
+	ndr_push_GUID(ndr, NDR_SCALARS | NDR_BUFFERS, &syntax->uuid);
+	ndr_push_uint16(ndr, NDR_SCALARS, syntax->if_version);
+
+	return ndr_push_blob(ndr);
+}
+
+const char *dcerpc_floor_get_rhs_data(TALLOC_CTX *mem_ctx, struct epm_floor *epm_floor)
+{
+	switch (epm_floor->lhs.protocol) {
+	case EPM_PROTOCOL_TCP:
+		if (epm_floor->rhs.tcp.port == 0) return NULL;
+		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.tcp.port);
+		
+	case EPM_PROTOCOL_UDP:
+		if (epm_floor->rhs.udp.port == 0) return NULL;
+		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.udp.port);
+
+	case EPM_PROTOCOL_HTTP:
+		if (epm_floor->rhs.http.port == 0) return NULL;
+		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.http.port);
+
+	case EPM_PROTOCOL_IP:
+		return talloc_strdup(mem_ctx, epm_floor->rhs.ip.ipaddr);
+
+	case EPM_PROTOCOL_NCACN:
+		return NULL;
+
+	case EPM_PROTOCOL_NCADG:
+		return NULL;
+
+	case EPM_PROTOCOL_SMB:
+		if (strlen(epm_floor->rhs.smb.unc) == 0) return NULL;
+		return talloc_strdup(mem_ctx, epm_floor->rhs.smb.unc);
+
+	case EPM_PROTOCOL_PIPE:
+		if (strlen(epm_floor->rhs.pipe.path) == 0) return NULL;
+		return talloc_strdup(mem_ctx, epm_floor->rhs.pipe.path);
+
+	case EPM_PROTOCOL_NETBIOS:
+		if (strlen(epm_floor->rhs.netbios.name) == 0) return NULL;
+		return talloc_strdup(mem_ctx, epm_floor->rhs.netbios.name);
+
+	case EPM_PROTOCOL_NCALRPC:
+		return NULL;
+		
+	case EPM_PROTOCOL_VINES_SPP:
+		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.vines_spp.port);
+		
+	case EPM_PROTOCOL_VINES_IPC:
+		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.vines_ipc.port);
+		
+	case EPM_PROTOCOL_STREETTALK:
+		return talloc_strdup(mem_ctx, epm_floor->rhs.streettalk.streettalk);
+		
+	case EPM_PROTOCOL_UNIX_DS:
+		if (strlen(epm_floor->rhs.unix_ds.path) == 0) return NULL;
+		return talloc_strdup(mem_ctx, epm_floor->rhs.unix_ds.path);
+		
+	case EPM_PROTOCOL_NULL:
+		return NULL;
+
+	default:
+		DEBUG(0,("Unsupported lhs protocol %d\n", epm_floor->lhs.protocol));
+		break;
+	}
+
+	return NULL;
+}
+
+static NTSTATUS dcerpc_floor_set_rhs_data(TALLOC_CTX *mem_ctx, 
+					  struct epm_floor *epm_floor,  
+					  const char *data)
+{
+	switch (epm_floor->lhs.protocol) {
+	case EPM_PROTOCOL_TCP:
+		epm_floor->rhs.tcp.port = atoi(data);
+		return NT_STATUS_OK;
+		
+	case EPM_PROTOCOL_UDP:
+		epm_floor->rhs.udp.port = atoi(data);
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_HTTP:
+		epm_floor->rhs.http.port = atoi(data);
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_IP:
+		epm_floor->rhs.ip.ipaddr = talloc_strdup(mem_ctx, data);
+		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.ip.ipaddr);
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_NCACN:
+		epm_floor->rhs.ncacn.minor_version = 0;
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_NCADG:
+		epm_floor->rhs.ncadg.minor_version = 0;
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_SMB:
+		epm_floor->rhs.smb.unc = talloc_strdup(mem_ctx, data);
+		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.smb.unc);
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_PIPE:
+		epm_floor->rhs.pipe.path = talloc_strdup(mem_ctx, data);
+		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.pipe.path);
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_NETBIOS:
+		epm_floor->rhs.netbios.name = talloc_strdup(mem_ctx, data);
+		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.netbios.name);
+		return NT_STATUS_OK;
+
+	case EPM_PROTOCOL_NCALRPC:
+		return NT_STATUS_OK;
+		
+	case EPM_PROTOCOL_VINES_SPP:
+		epm_floor->rhs.vines_spp.port = atoi(data);
+		return NT_STATUS_OK;
+		
+	case EPM_PROTOCOL_VINES_IPC:
+		epm_floor->rhs.vines_ipc.port = atoi(data);
+		return NT_STATUS_OK;
+		
+	case EPM_PROTOCOL_STREETTALK:
+		epm_floor->rhs.streettalk.streettalk = talloc_strdup(mem_ctx, data);
+		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.streettalk.streettalk);
+		return NT_STATUS_OK;
+		
+	case EPM_PROTOCOL_UNIX_DS:
+		epm_floor->rhs.unix_ds.path = talloc_strdup(mem_ctx, data);
+		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.unix_ds.path);
+		return NT_STATUS_OK;
+		
+	case EPM_PROTOCOL_NULL:
+		return NT_STATUS_OK;
+
+	default:
+		DEBUG(0,("Unsupported lhs protocol %d\n", epm_floor->lhs.protocol));
+		break;
+	}
+
+	return NT_STATUS_NOT_SUPPORTED;
+}
+
+enum dcerpc_transport_t dcerpc_transport_by_endpoint_protocol(int prot)
+{
+	int i;
+
+	/* Find a transport that has 'prot' as 4th protocol */
+	for (i=0;i<ARRAY_SIZE(transports);i++) {
+		if (transports[i].num_protocols >= 2 && 
+			transports[i].protseq[1] == prot) {
+			return transports[i].transport;
+		}
+	}
+	
+	/* Unknown transport */
+	return (unsigned int)-1;
+}
+
+_PUBLIC_ enum dcerpc_transport_t dcerpc_transport_by_tower(struct epm_tower *tower)
+{
+	int i;
+
+	/* Find a transport that matches this tower */
+	for (i=0;i<ARRAY_SIZE(transports);i++) {
+		int j;
+		if (transports[i].num_protocols != tower->num_floors - 2) {
+			continue; 
+		}
+
+		for (j = 0; j < transports[i].num_protocols; j++) {
+			if (transports[i].protseq[j] != tower->floors[j+2].lhs.protocol) {
+				break;
+			}
+		}
+
+		if (j == transports[i].num_protocols) {
+			return transports[i].transport;
+		}
+	}
+	
+	/* Unknown transport */
+	return (unsigned int)-1;
+}
+
+_PUBLIC_ NTSTATUS dcerpc_binding_from_tower(TALLOC_CTX *mem_ctx, 
+				   struct epm_tower *tower, 
+				   struct dcerpc_binding **b_out)
+{
+	NTSTATUS status;
+	struct dcerpc_binding *binding;
+
+	binding = talloc(mem_ctx, struct dcerpc_binding);
+	NT_STATUS_HAVE_NO_MEMORY(binding);
+
+	ZERO_STRUCT(binding->object);
+	binding->options = NULL;
+	binding->host = NULL;
+	binding->target_hostname = NULL;
+	binding->flags = 0;
+	binding->assoc_group_id = 0;
+
+	binding->transport = dcerpc_transport_by_tower(tower);
+
+	if (binding->transport == (unsigned int)-1) {
+		return NT_STATUS_NOT_SUPPORTED;
+	}
+
+	if (tower->num_floors < 1) {
+		return NT_STATUS_OK;
+	}
+
+	/* Set object uuid */
+	status = dcerpc_floor_get_lhs_data(&tower->floors[0], &binding->object);
+	
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("Error pulling object uuid and version: %s", nt_errstr(status)));	
+		return status;
+	}
+
+	/* Ignore floor 1, it contains the NDR version info */
+	
+	binding->options = NULL;
+
+	/* Set endpoint */
+	if (tower->num_floors >= 4) {
+		binding->endpoint = dcerpc_floor_get_rhs_data(mem_ctx, &tower->floors[3]);
+	} else {
+		binding->endpoint = NULL;
+	}
+
+	/* Set network address */
+	if (tower->num_floors >= 5) {
+		binding->host = dcerpc_floor_get_rhs_data(mem_ctx, &tower->floors[4]);
+		NT_STATUS_HAVE_NO_MEMORY(binding->host);
+		binding->target_hostname = binding->host;
+	}
+	*b_out = binding;
+	return NT_STATUS_OK;
+}
+
+_PUBLIC_ NTSTATUS dcerpc_binding_build_tower(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding, struct epm_tower *tower)
+{
+	const enum epm_protocol *protseq = NULL;
+	int num_protocols = -1, i;
+	NTSTATUS status;
+	
+	/* Find transport */
+	for (i=0;i<ARRAY_SIZE(transports);i++) {
+		if (transports[i].transport == binding->transport) {
+			protseq = transports[i].protseq;
+			num_protocols = transports[i].num_protocols;
+			break;
+		}
+	}
+
+	if (num_protocols == -1) {
+		DEBUG(0, ("Unable to find transport with id '%d'\n", binding->transport));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	tower->num_floors = 2 + num_protocols;
+	tower->floors = talloc_array(mem_ctx, struct epm_floor, tower->num_floors);
+
+	/* Floor 0 */
+	tower->floors[0].lhs.protocol = EPM_PROTOCOL_UUID;
+
+	tower->floors[0].lhs.lhs_data = dcerpc_floor_pack_lhs_data(mem_ctx, &binding->object);
+
+	tower->floors[0].rhs.uuid.unknown = data_blob_talloc_zero(mem_ctx, 2);
+	
+	/* Floor 1 */
+	tower->floors[1].lhs.protocol = EPM_PROTOCOL_UUID;
+
+	tower->floors[1].lhs.lhs_data = dcerpc_floor_pack_lhs_data(mem_ctx, 
+								&ndr_transfer_syntax);
+	
+	tower->floors[1].rhs.uuid.unknown = data_blob_talloc_zero(mem_ctx, 2);
+	
+	/* Floor 2 to num_protocols */
+	for (i = 0; i < num_protocols; i++) {
+		tower->floors[2 + i].lhs.protocol = protseq[i];
+		tower->floors[2 + i].lhs.lhs_data = data_blob_talloc(mem_ctx, NULL, 0);
+		ZERO_STRUCT(tower->floors[2 + i].rhs);
+		dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[2 + i], "");
+	}
+
+	/* The 4th floor contains the endpoint */
+	if (num_protocols >= 2 && binding->endpoint) {
+		status = dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[3], binding->endpoint);
+		if (NT_STATUS_IS_ERR(status)) {
+			return status;
+		}
+	}
+	
+	/* The 5th contains the network address */
+	if (num_protocols >= 3 && binding->host) {
+		if (is_ipaddress(binding->host)) {
+			status = dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[4], 
+							   binding->host);
+		} else {
+			/* note that we don't attempt to resolve the
+			   name here - when we get a hostname here we
+			   are in the client code, and want to put in
+			   a wildcard all-zeros IP for the server to
+			   fill in */
+			status = dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[4], 
+							   "0.0.0.0");
+		}
+		if (NT_STATUS_IS_ERR(status)) {
+			return status;
+		}
+	}
+
+	return NT_STATUS_OK;
+}
+
+
+struct epm_map_binding_state {
+	struct dcerpc_binding *binding;
+	const struct ndr_interface_table *table;
+	struct dcerpc_pipe *pipe;
+	struct policy_handle handle;
+	struct GUID guid;
+	struct epm_twr_t twr;
+	struct epm_twr_t *twr_r;
+	struct epm_Map r;
+};
+
+
+static void continue_epm_recv_binding(struct composite_context *ctx);
+static void continue_epm_map(struct rpc_request *req);
+
+
+/*
+  Stage 2 of epm_map_binding: Receive connected rpc pipe and send endpoint
+  mapping rpc request
+*/
+static void continue_epm_recv_binding(struct composite_context *ctx)
+{
+	struct rpc_request *map_req;
+
+	struct composite_context *c = talloc_get_type(ctx->async.private_data,
+						      struct composite_context);
+	struct epm_map_binding_state *s = talloc_get_type(c->private_data,
+							  struct epm_map_binding_state);
+
+	/* receive result of rpc pipe connect request */
+	c->status = dcerpc_pipe_connect_b_recv(ctx, c, &s->pipe);
+	if (!composite_is_ok(c)) return;
+
+	s->pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
+
+	/* prepare requested binding parameters */
+	s->binding->object         = s->table->syntax_id;
+
+	c->status = dcerpc_binding_build_tower(s->pipe, s->binding, &s->twr.tower);
+	if (!composite_is_ok(c)) return;
+	
+	/* with some nice pretty paper around it of course */
+	s->r.in.object        = &s->guid;
+	s->r.in.map_tower     = &s->twr;
+	s->r.in.entry_handle  = &s->handle;
+	s->r.in.max_towers    = 1;
+	s->r.out.entry_handle = &s->handle;
+
+	/* send request for an endpoint mapping - a rpc request on connected pipe */
+	map_req = dcerpc_epm_Map_send(s->pipe, c, &s->r);
+	if (composite_nomem(map_req, c)) return;
+	
+	composite_continue_rpc(c, map_req, continue_epm_map, c);
+}
+
+
+/*
+  Stage 3 of epm_map_binding: Receive endpoint mapping and provide binding details
+*/
+static void continue_epm_map(struct rpc_request *req)
+{
+	struct composite_context *c = talloc_get_type(req->async.private_data,
+						      struct composite_context);
+	struct epm_map_binding_state *s = talloc_get_type(c->private_data,
+							  struct epm_map_binding_state);
+
+	/* receive result of a rpc request */
+	c->status = dcerpc_ndr_request_recv(req);
+	if (!composite_is_ok(c)) return;
+
+	/* check the details */
+	if (s->r.out.result != 0 || *s->r.out.num_towers != 1) {
+		composite_error(c, NT_STATUS_PORT_UNREACHABLE);
+		return;
+	}
+	
+	s->twr_r = s->r.out.towers[0].twr;
+	if (s->twr_r == NULL) {
+		composite_error(c, NT_STATUS_PORT_UNREACHABLE);
+		return;
+	}
+
+	if (s->twr_r->tower.num_floors != s->twr.tower.num_floors ||
+	    s->twr_r->tower.floors[3].lhs.protocol != s->twr.tower.floors[3].lhs.protocol) {
+		composite_error(c, NT_STATUS_PORT_UNREACHABLE);
+		return;
+	}
+
+	/* get received endpoint */
+	s->binding->endpoint = talloc_reference(s->binding,
+						dcerpc_floor_get_rhs_data(c, &s->twr_r->tower.floors[3]));
+	if (composite_nomem(s->binding->endpoint, c)) return;
+
+	composite_done(c);
+}
+
+
+/*
+  Request for endpoint mapping of dcerpc binding - try to request for endpoint
+  unless there is default one.
+*/
+struct composite_context *dcerpc_epm_map_binding_send(TALLOC_CTX *mem_ctx,
+						      struct dcerpc_binding *binding,
+						      const struct ndr_interface_table *table,
+						      struct event_context *ev,
+						      struct loadparm_context *lp_ctx)
+{
+	struct composite_context *c;
+	struct epm_map_binding_state *s;
+	struct composite_context *pipe_connect_req;
+	struct cli_credentials *anon_creds;
+	struct event_context *new_ev = NULL;
+
+	NTSTATUS status;
+	struct dcerpc_binding *epmapper_binding;
+	int i;
+
+	/* Try to find event context in memory context in case passed
+	 * event_context (argument) was NULL. If there's none, just
+	 * create a new one.
+	 */
+	if (ev == NULL) {
+		ev = event_context_find(mem_ctx);
+		if (ev == NULL) {
+			new_ev = event_context_init(mem_ctx);
+			if (new_ev == NULL) return NULL;
+			ev = new_ev;
+		}
+	}
+
+	/* composite context allocation and setup */
+	c = composite_create(mem_ctx, ev);
+	if (c == NULL) {
+		talloc_free(new_ev);
+		return NULL;
+	}
+	talloc_steal(c, new_ev);
+
+	s = talloc_zero(c, struct epm_map_binding_state);
+	if (composite_nomem(s, c)) return c;
+	c->private_data = s;
+
+	s->binding = binding;
+	s->table   = table;
+
+	/* anonymous credentials for rpc connection used to get endpoint mapping */
+	anon_creds = cli_credentials_init(mem_ctx);
+	cli_credentials_set_event_context(anon_creds, ev);
+	cli_credentials_set_anonymous(anon_creds);
+
+	/*
+	  First, check if there is a default endpoint specified in the IDL
+	*/
+	if (table != NULL) {
+		struct dcerpc_binding *default_binding;
+
+		/* Find one of the default pipes for this interface */
+		for (i = 0; i < table->endpoints->count; i++) {
+			status = dcerpc_parse_binding(mem_ctx, table->endpoints->names[i], &default_binding);
+
+			if (NT_STATUS_IS_OK(status)) {
+				if (binding->transport == NCA_UNKNOWN) 
+					binding->transport = default_binding->transport;
+				if (default_binding->transport == binding->transport && 
+					default_binding->endpoint) {
+					binding->endpoint = talloc_reference(binding, default_binding->endpoint);
+					talloc_free(default_binding);
+
+					composite_done(c);
+					return c;
+
+				} else {
+					talloc_free(default_binding);
+				}
+			}
+		}
+	}
+
+	epmapper_binding = talloc_zero(c, struct dcerpc_binding);
+	if (composite_nomem(epmapper_binding, c)) return c;
+
+	/* basic endpoint mapping data */
+	epmapper_binding->transport		= binding->transport;
+	epmapper_binding->host			= talloc_reference(epmapper_binding, binding->host);
+	epmapper_binding->target_hostname       = epmapper_binding->host;
+	epmapper_binding->options		= NULL;
+	epmapper_binding->flags			= 0;
+	epmapper_binding->assoc_group_id	= 0;
+	epmapper_binding->endpoint		= NULL;
+
+	/* initiate rpc pipe connection */
+	pipe_connect_req = dcerpc_pipe_connect_b_send(c, epmapper_binding, 
+						      &ndr_table_epmapper,
+						      anon_creds, c->event_ctx,
+						      lp_ctx);
+	if (composite_nomem(pipe_connect_req, c)) return c;
+	
+	composite_continue(c, pipe_connect_req, continue_epm_recv_binding, c);
+	return c;
+}
+
+
+/*
+  Receive result of endpoint mapping request
+ */
+NTSTATUS dcerpc_epm_map_binding_recv(struct composite_context *c)
+{
+	NTSTATUS status = composite_wait(c);
+	
+	talloc_free(c);
+	return status;
+}
+
+
+/*
+  Get endpoint mapping for rpc connection
+*/
+_PUBLIC_ NTSTATUS dcerpc_epm_map_binding(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding,
+				const struct ndr_interface_table *table, struct event_context *ev,
+				struct loadparm_context *lp_ctx)
+{
+	struct composite_context *c;
+
+	c = dcerpc_epm_map_binding_send(mem_ctx, binding, table, ev, lp_ctx);
+	return dcerpc_epm_map_binding_recv(c);
+}
+
+
+struct pipe_auth_state {
+	struct dcerpc_pipe *pipe;
+	struct dcerpc_binding *binding;
+	const struct ndr_interface_table *table;
+	struct loadparm_context *lp_ctx;
+	struct cli_credentials *credentials;
+};
+
+
+static void continue_auth_schannel(struct composite_context *ctx);
+static void continue_auth(struct composite_context *ctx);
+static void continue_auth_none(struct composite_context *ctx);
+static void continue_ntlmssp_connection(struct composite_context *ctx);
+static void continue_spnego_after_wrong_pass(struct composite_context *ctx);
+
+
+/*
+  Stage 2 of pipe_auth: Receive result of schannel bind request
+*/
+static void continue_auth_schannel(struct composite_context *ctx)
+{
+	struct composite_context *c = talloc_get_type(ctx->async.private_data,
+						      struct composite_context);
+
+	c->status = dcerpc_bind_auth_schannel_recv(ctx);
+	if (!composite_is_ok(c)) return;
+
+	composite_done(c);
+}
+
+
+/*
+  Stage 2 of pipe_auth: Receive result of authenticated bind request
+*/
+static void continue_auth(struct composite_context *ctx)
+{
+	struct composite_context *c = talloc_get_type(ctx->async.private_data,
+						      struct composite_context);
+
+	c->status = dcerpc_bind_auth_recv(ctx);
+	if (!composite_is_ok(c)) return;
+	
+	composite_done(c);
+}
+/*
+  Stage 2 of pipe_auth: Receive result of authenticated bind request, but handle fallbacks:
+  SPNEGO -> NTLMSSP
+*/
+static void continue_auth_auto(struct composite_context *ctx)
+{
+	struct composite_context *c = talloc_get_type(ctx->async.private_data,
+						      struct composite_context);
+	struct pipe_auth_state *s = talloc_get_type(c->private_data, struct pipe_auth_state);
+	struct composite_context *sec_conn_req;
+
+	c->status = dcerpc_bind_auth_recv(ctx);
+	if (NT_STATUS_EQUAL(c->status, NT_STATUS_INVALID_PARAMETER)) {
+		/*
+		 * Retry with NTLMSSP auth as fallback
+		 * send a request for secondary rpc connection
+		 */
+		sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
+								s->binding);
+		composite_continue(c, sec_conn_req, continue_ntlmssp_connection, c);
+		return;
+	} else if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
+		if (cli_credentials_wrong_password(s->credentials)) {
+			/*
+			 * Retry SPNEGO with a better password
+			 * send a request for secondary rpc connection
+			 */
+			sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
+									s->binding);
+			composite_continue(c, sec_conn_req, continue_spnego_after_wrong_pass, c);
+			return;
+		}
+	}
+
+	if (!composite_is_ok(c)) return;
+
+	composite_done(c);
+}
+
+/*
+  Stage 3 of pipe_auth (fallback to NTLMSSP case): Receive secondary
+  rpc connection (the first one can't be used any more, due to the
+  bind nak) and perform authenticated bind request
+*/
+static void continue_ntlmssp_connection(struct composite_context *ctx)
+{
+	struct composite_context *c;
+	struct pipe_auth_state *s;
+	struct composite_context *auth_req;
+	struct dcerpc_pipe *p2;
+
+	c = talloc_get_type(ctx->async.private_data, struct composite_context);
+	s = talloc_get_type(c->private_data, struct pipe_auth_state);
+
+	/* receive secondary rpc connection */
+	c->status = dcerpc_secondary_connection_recv(ctx, &p2);
+	if (!composite_is_ok(c)) return;
+
+	talloc_steal(s, p2);
+	talloc_steal(p2, s->pipe);
+	s->pipe = p2;
+
+	/* initiate a authenticated bind */
+	auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
+					 s->credentials, s->lp_ctx,
+					 DCERPC_AUTH_TYPE_NTLMSSP,
+					 dcerpc_auth_level(s->pipe->conn),
+					 s->table->authservices->names[0]);
+	composite_continue(c, auth_req, continue_auth, c);
+}
+
+/*
+  Stage 3 of pipe_auth (retry on wrong password): Receive secondary
+  rpc connection (the first one can't be used any more, due to the
+  bind nak) and perform authenticated bind request
+*/
+static void continue_spnego_after_wrong_pass(struct composite_context *ctx)
+{
+	struct composite_context *c;
+	struct pipe_auth_state *s;
+	struct composite_context *auth_req;
+	struct dcerpc_pipe *p2;
+
+	c = talloc_get_type(ctx->async.private_data, struct composite_context);
+	s = talloc_get_type(c->private_data, struct pipe_auth_state);
+
+	/* receive secondary rpc connection */
+	c->status = dcerpc_secondary_connection_recv(ctx, &p2);
+	if (!composite_is_ok(c)) return;
+
+	talloc_steal(s, p2);
+	talloc_steal(p2, s->pipe);
+	s->pipe = p2;
+
+	/* initiate a authenticated bind */
+	auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
+					 s->credentials, s->lp_ctx, DCERPC_AUTH_TYPE_SPNEGO,
+					 dcerpc_auth_level(s->pipe->conn),
+					 s->table->authservices->names[0]);
+	composite_continue(c, auth_req, continue_auth, c);
+}
+
+
+/*
+  Stage 2 of pipe_auth: Receive result of non-authenticated bind request
+*/
+static void continue_auth_none(struct composite_context *ctx)
+{
+	struct composite_context *c = talloc_get_type(ctx->async.private_data,
+						      struct composite_context);
+
+	c->status = dcerpc_bind_auth_none_recv(ctx);
+	if (!composite_is_ok(c)) return;
+	
+	composite_done(c);
+}
+
+
+/*
+  Request to perform an authenticated bind if required. Authentication
+  is determined using credentials passed and binding flags.
+*/
+struct composite_context *dcerpc_pipe_auth_send(struct dcerpc_pipe *p, 
+						struct dcerpc_binding *binding,
+						const struct ndr_interface_table *table,
+						struct cli_credentials *credentials,
+						struct loadparm_context *lp_ctx)
+{
+	struct composite_context *c;
+	struct pipe_auth_state *s;
+	struct composite_context *auth_schannel_req;
+	struct composite_context *auth_req;
+	struct composite_context *auth_none_req;
+	struct dcerpc_connection *conn;
+	uint8_t auth_type;
+
+	/* composite context allocation and setup */
+	c = composite_create(p, p->conn->event_ctx);
+	if (c == NULL) return NULL;
+
+	s = talloc_zero(c, struct pipe_auth_state);
+	if (composite_nomem(s, c)) return c;
+	c->private_data = s;
+
+	/* store parameters in state structure */
+	s->binding      = binding;
+	s->table        = table;
+	s->credentials  = credentials;
+	s->pipe         = p;
+	s->lp_ctx       = lp_ctx;
+
+	conn = s->pipe->conn;
+	conn->flags = binding->flags;
+	
+	/* remember the binding string for possible secondary connections */
+	conn->binding_string = dcerpc_binding_string(p, binding);
+
+	if (cli_credentials_is_anonymous(s->credentials)) {
+		auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
+		composite_continue(c, auth_none_req, continue_auth_none, c);
+		return c;
+	}
+
+	if ((binding->flags & DCERPC_SCHANNEL) &&
+	    !cli_credentials_get_netlogon_creds(s->credentials)) {
+		/* If we don't already have netlogon credentials for
+		 * the schannel bind, then we have to get these
+		 * first */
+		auth_schannel_req = dcerpc_bind_auth_schannel_send(c, s->pipe, s->table,
+								   s->credentials, s->lp_ctx,
+								   dcerpc_auth_level(conn));
+		composite_continue(c, auth_schannel_req, continue_auth_schannel, c);
+		return c;
+	}
+
+	/*
+	 * we rely on the already authenticated CIFS connection
+	 * if not doing sign or seal
+	 */
+	if (conn->transport.transport == NCACN_NP &&
+	    !(s->binding->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
+		auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
+		composite_continue(c, auth_none_req, continue_auth_none, c);
+		return c;
+	}
+
+
+	/* Perform an authenticated DCE-RPC bind
+	 */
+	if (!(conn->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
+		/*
+		  we are doing an authenticated connection,
+		  but not using sign or seal. We must force
+		  the CONNECT dcerpc auth type as a NONE auth
+		  type doesn't allow authentication
+		  information to be passed.
+		*/
+		conn->flags |= DCERPC_CONNECT;
+	}
+
+	if (s->binding->flags & DCERPC_AUTH_SPNEGO) {
+		auth_type = DCERPC_AUTH_TYPE_SPNEGO;
+
+	} else if (s->binding->flags & DCERPC_AUTH_KRB5) {
+		auth_type = DCERPC_AUTH_TYPE_KRB5;
+
+	} else if (s->binding->flags & DCERPC_SCHANNEL) {
+		auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
+
+	} else if (s->binding->flags & DCERPC_AUTH_NTLM) {
+		auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
+
+	} else {
+		/* try SPNEGO with fallback to NTLMSSP */
+		auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
+						 s->credentials, s->lp_ctx, DCERPC_AUTH_TYPE_SPNEGO,
+						 dcerpc_auth_level(conn),
+						 s->table->authservices->names[0]);
+		composite_continue(c, auth_req, continue_auth_auto, c);
+		return c;
+	}
+
+	auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
+					 s->credentials, s->lp_ctx, auth_type,
+					 dcerpc_auth_level(conn),
+					 s->table->authservices->names[0]);
+	composite_continue(c, auth_req, continue_auth, c);
+	return c;
+}
+
+
+/*
+  Receive result of authenticated bind request on dcerpc pipe
+
+  This returns *p, which may be different to the one originally
+  supllied, as it rebinds to a new pipe due to authentication fallback
+
+*/
+NTSTATUS dcerpc_pipe_auth_recv(struct composite_context *c, TALLOC_CTX *mem_ctx, 
+			       struct dcerpc_pipe **p)
+{
+	NTSTATUS status;
+
+	struct pipe_auth_state *s = talloc_get_type(c->private_data,
+						    struct pipe_auth_state);
+	status = composite_wait(c);
+	if (!NT_STATUS_IS_OK(status)) {
+		char *uuid_str = GUID_string(s->pipe, &s->table->syntax_id.uuid);
+		DEBUG(0, ("Failed to bind to uuid %s - %s\n", uuid_str, nt_errstr(status)));
+		talloc_free(uuid_str);
+	} else {
+		talloc_steal(mem_ctx, s->pipe);
+		*p = s->pipe;
+	}
+
+	talloc_free(c);
+	return status;
+}
+
+
+/* 
+   Perform an authenticated bind if needed - sync version
+
+   This may change *p, as it rebinds to a new pipe due to authentication fallback
+*/
+_PUBLIC_ NTSTATUS dcerpc_pipe_auth(TALLOC_CTX *mem_ctx,
+			  struct dcerpc_pipe **p, 
+			  struct dcerpc_binding *binding,
+			  const struct ndr_interface_table *table,
+			  struct cli_credentials *credentials,
+			  struct loadparm_context *lp_ctx)
+{
+	struct composite_context *c;
+
+	c = dcerpc_pipe_auth_send(*p, binding, table, credentials, lp_ctx);
+	return dcerpc_pipe_auth_recv(c, mem_ctx, p);
+}
+
+
+NTSTATUS dcerpc_generic_session_key(struct dcerpc_connection *c,
+				    DATA_BLOB *session_key)
+{
+	/* this took quite a few CPU cycles to find ... */
+	session_key->data = discard_const_p(unsigned char, "SystemLibraryDTC");
+	session_key->length = 16;
+	return NT_STATUS_OK;
+}
+
+/*
+  fetch the user session key - may be default (above) or the SMB session key
+*/
+_PUBLIC_ NTSTATUS dcerpc_fetch_session_key(struct dcerpc_pipe *p,
+				  DATA_BLOB *session_key)
+{
+	return p->conn->security_state.session_key(p->conn, session_key);
+}
+
+
+/*
+  log a rpc packet in a format suitable for ndrdump. This is especially useful
+  for sealed packets, where ethereal cannot easily see the contents
+
+  this triggers on a debug level of >= 10
+*/
+_PUBLIC_ void dcerpc_log_packet(const struct ndr_interface_table *ndr,
+		       uint32_t opnum, uint32_t flags, 
+		       DATA_BLOB *pkt)
+{
+	const int num_examples = 20;
+	int i;
+
+	if (DEBUGLEVEL < 10) return;
+
+	for (i=0;i<num_examples;i++) {
+		char *name=NULL;
+		asprintf(&name, "%s/rpclog/%s-%u.%d.%s", 
+			 lp_lockdir(global_loadparm), ndr->name, opnum, i,
+			 (flags&NDR_IN)?"in":"out");
+		if (name == NULL) {
+			return;
+		}
+		if (!file_exist(name)) {
+			if (file_save(name, pkt->data, pkt->length)) {
+				DEBUG(10,("Logged rpc packet to %s\n", name));
+			}
+			free(name);
+			break;
+		}
+		free(name);
+	}
+}
+
+
+
+/*
+  create a secondary context from a primary connection
+
+  this uses dcerpc_alter_context() to create a new dcerpc context_id
+*/
+_PUBLIC_ NTSTATUS dcerpc_secondary_context(struct dcerpc_pipe *p, 
+				  struct dcerpc_pipe **pp2,
+				  const struct ndr_interface_table *table)
+{
+	NTSTATUS status;
+	struct dcerpc_pipe *p2;
+	
+	p2 = talloc_zero(p, struct dcerpc_pipe);
+	if (p2 == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	p2->conn = talloc_reference(p2, p->conn);
+	p2->request_timeout = p->request_timeout;
+
+	p2->context_id = ++p->conn->next_context_id;
+
+	p2->syntax = table->syntax_id;
+
+	p2->transfer_syntax = ndr_transfer_syntax;
+
+	p2->binding = talloc_reference(p2, p->binding);
+
+	status = dcerpc_alter_context(p2, p2, &p2->syntax, &p2->transfer_syntax);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(p2);
+		return status;
+	}
+
+	*pp2 = p2;
+
+	return NT_STATUS_OK;
+}