added a basic dcerpc endpoint mapper to Samba4. Currently only

implements the epm_Lookup() call, I'll add the other important calls
soon. I was rather pleased to find that epm_Lookup() worked first
time, which is particularly surprising given its complexity.

This required quite a bit of new infrastructure:

  * a generic way of handling dcerpc policy handles in the rpc server

  * added type checked varients of talloc. These are much less error
    prone. I'd like to move to using these for nearly all uses of
    talloc.

  * added more dcerpc fault handling code, and translation from
    NTSTATUS to a dcerpc fault code

  * added data_blob_talloc_zero() for allocating an initially zero
    blob

  * added a endpoint enumeration hook in the dcerpc endpoint server
    operations
(This used to be commit 3f85f9b782dc17417baf1ca557fcae22f5b6a83a)

1 files changed, 274 insertions, 0 deletions

diff --git a/source4/rpc_server/epmapper/rpc_epmapper.c b/source4/rpc_server/epmapper/rpc_epmapper.c
new file mode 100644
index 0000000000..945823c013
--- /dev/null
+++ b/source4/rpc_server/epmapper/rpc_epmapper.c
@@ -0,0 +1,274 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   endpoint server for the epmapper pipe
+
+   Copyright (C) Andrew Tridgell 2003
+   
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+
+/* handle types for this module */
+enum handle_types {HTYPE_LOOKUP};
+
+static NTSTATUS epm_Insert(struct dcesrv_state *dce, TALLOC_CTX *mem_ctx, 
+			   struct epm_Lookup *r)
+{
+	return NT_STATUS_NOT_IMPLEMENTED;
+}
+
+static NTSTATUS epm_Delete(struct dcesrv_state *dce, TALLOC_CTX *mem_ctx, 
+			   struct epm_Lookup *r)
+{
+	return NT_STATUS_NOT_IMPLEMENTED;
+}
+
+
+/*
+  implement epm_Lookup. This call is used to enumerate the interfaces
+  available on a rpc server
+*/
+static NTSTATUS epm_Lookup(struct dcesrv_state *dce, TALLOC_CTX *mem_ctx, 
+			   struct epm_Lookup *r)
+{
+	struct dcesrv_handle *h;
+	struct rpc_eps {
+		uint32 count;
+		struct dcesrv_ep_iface *e;
+	} *eps;
+	uint32 num_ents;
+	int i;
+
+	h = dcesrv_handle_fetch(dce, r->in.entry_handle, HTYPE_LOOKUP);
+	if (!h) {
+		return NT_STATUS_INVALID_HANDLE;
+	}
+
+	eps = h->data;
+
+	if (!eps) {
+		/* this is the first call - fill the list. Subsequent calls 
+		   will feed from this list, stored in the handle */
+		struct dce_endpoint *d;
+		struct dcesrv_ep_iface *e;
+
+		eps = talloc_p(h->mem_ctx, struct rpc_eps);
+		if (!eps) {
+			return NT_STATUS_NO_MEMORY;
+		}
+		eps->count = 0;
+		eps->e = NULL;
+		h->data = eps;
+		
+		for (d=dce->smb->dcesrv.endpoint_list; d; d=d->next) {
+			int count = d->endpoint_ops->lookup_endpoints(h->mem_ctx, &e);
+			if (count > 0) {
+				eps->e = talloc_realloc_p(h->mem_ctx,
+							  eps->e,
+							  struct dcesrv_ep_iface,
+							  eps->count + count);
+				if (!eps->e) {
+					return NT_STATUS_NO_MEMORY;
+				}
+				memcpy(eps->e + eps->count, e, sizeof(*e) * count);
+				eps->count += count;
+			}
+		}
+	}
+
+	/* return the next N elements */
+	num_ents = r->in.max_ents;
+	if (num_ents > eps->count) {
+		num_ents = eps->count;
+	}
+
+	*r->out.entry_handle = h->wire_handle;
+	r->out.num_ents = num_ents;
+	r->out.status = 0;
+
+	if (num_ents == 0) {
+		r->out.entries = NULL;
+		return NT_STATUS_OK;
+	}
+
+	r->out.entries = talloc_array_p(mem_ctx, struct epm_entry_t, num_ents);
+	if (!r->out.entries) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	for (i=0;i<num_ents;i++) {
+		struct epm_twr_t *t;
+		struct epm_towers *twr;
+
+		ZERO_STRUCT(r->out.entries[i].object);
+		r->out.entries[i].annotation = "";
+		t = talloc_p(mem_ctx, struct epm_twr_t);
+		if (!twr) {
+			return NT_STATUS_NO_MEMORY;
+		}
+		r->out.entries[i].tower = t;
+		twr = &t->towers;
+		twr->num_floors = 5;
+		twr->floors = talloc_array_p(mem_ctx, struct epm_floor, 5);
+		if (!twr->floors) {
+			return NT_STATUS_NO_MEMORY;
+		}
+
+		twr->floors[0].lhs.protocol = EPM_PROTOCOL_UUID;
+		GUID_from_string(eps->e[i].uuid, &twr->floors[0].lhs.info.uuid.uuid);
+		twr->floors[0].lhs.info.uuid.version = eps->e[i].if_version;
+		twr->floors[0].rhs.rhs_data = data_blob_talloc_zero(mem_ctx, 2);
+
+		/* encoded with NDR ... */
+		twr->floors[1].lhs.protocol = EPM_PROTOCOL_UUID;
+		GUID_from_string(NDR_GUID, &twr->floors[1].lhs.info.uuid.uuid);
+		twr->floors[1].lhs.info.uuid.version = NDR_GUID_VERSION;
+		twr->floors[1].rhs.rhs_data = data_blob_talloc_zero(mem_ctx, 2);
+
+		/* on an RPC connection ... */
+		twr->floors[2].lhs.protocol = EPM_PROTOCOL_RPC_C;
+		twr->floors[2].lhs.info.lhs_data = data_blob(NULL, 0);
+		twr->floors[2].rhs.rhs_data = data_blob_talloc_zero(mem_ctx, 2);
+
+		/* on a SMB pipe ... */
+		twr->floors[3].lhs.protocol = EPM_PROTOCOL_SMB;
+		twr->floors[3].lhs.info.lhs_data = data_blob(NULL, 0);
+		twr->floors[3].rhs.rhs_data.data = talloc_asprintf(mem_ctx, "\\PIPE\\%s", 
+								   eps->e[i].endpoint.info.smb_pipe);
+		twr->floors[3].rhs.rhs_data.length = strlen(twr->floors[3].rhs.rhs_data.data);
+
+		/* on an NetBIOS link ... */
+		twr->floors[4].lhs.protocol = EPM_PROTOCOL_NETBIOS;
+		twr->floors[4].lhs.info.lhs_data = data_blob(NULL, 0);
+		twr->floors[4].rhs.rhs_data.data = talloc_asprintf(mem_ctx, "\\\\%s", 
+								   lp_netbios_name());
+		twr->floors[4].rhs.rhs_data.length = strlen(twr->floors[4].rhs.rhs_data.data);
+	}
+
+	eps->count -= num_ents;
+	eps->e += num_ents;
+
+	return NT_STATUS_OK;
+}
+
+
+/*
+  implement epm_Map. This is used to find the specific endpoint to talk to given
+  a generic protocol tower
+*/
+static NTSTATUS epm_Map(struct dcesrv_state *dce, TALLOC_CTX *mem_ctx, 
+			   struct epm_Lookup *r)
+{
+	return NT_STATUS_NOT_IMPLEMENTED;
+}
+
+static NTSTATUS epm_LookupHandleFree(struct dcesrv_state *dce, TALLOC_CTX *mem_ctx, 
+			   struct epm_Lookup *r)
+{
+	return NT_STATUS_NOT_IMPLEMENTED;
+}
+
+static NTSTATUS epm_InqObject(struct dcesrv_state *dce, TALLOC_CTX *mem_ctx, 
+			   struct epm_Lookup *r)
+{
+	return NT_STATUS_NOT_IMPLEMENTED;
+}
+
+static NTSTATUS epm_MgmtDelete(struct dcesrv_state *dce, TALLOC_CTX *mem_ctx, 
+			   struct epm_Lookup *r)
+{
+	return NT_STATUS_NOT_IMPLEMENTED;
+}
+
+
+/**************************************************************************
+  all the code below this point is boilerplate that will be auto-generated
+***************************************************************************/
+
+static const dcesrv_dispatch_fn_t dispatch_table[] = {
+	(dcesrv_dispatch_fn_t)epm_Insert,
+	(dcesrv_dispatch_fn_t)epm_Delete,
+	(dcesrv_dispatch_fn_t)epm_Lookup,
+	(dcesrv_dispatch_fn_t)epm_Map,
+	(dcesrv_dispatch_fn_t)epm_LookupHandleFree,
+	(dcesrv_dispatch_fn_t)epm_InqObject,
+	(dcesrv_dispatch_fn_t)epm_MgmtDelete
+};
+
+
+/*
+  return True if we want to handle the given endpoint
+*/
+static BOOL op_query_endpoint(const struct dcesrv_endpoint *ep)
+{
+	return dcesrv_table_query(&dcerpc_table_epmapper, ep);
+}
+
+/*
+  setup for a particular rpc interface
+*/
+static BOOL op_set_interface(struct dcesrv_state *dce, const char *uuid, uint32 if_version)
+{
+	if (strcasecmp(uuid, dcerpc_table_epmapper.uuid) != 0 ||
+	    if_version != dcerpc_table_epmapper.if_version) {
+		DEBUG(2,("Attempt to use unknown interface %s/%d\n", uuid, if_version));
+		return False;
+	}
+
+	dce->ndr = &dcerpc_table_epmapper;
+	dce->dispatch = dispatch_table;
+
+	return True;
+}
+
+
+/* op_connect is called when a connection is made to an endpoint */
+static NTSTATUS op_connect(struct dcesrv_state *dce)
+{
+	return NT_STATUS_OK;
+}
+
+static void op_disconnect(struct dcesrv_state *dce)
+{
+	/* nothing to do */
+}
+
+
+static int op_lookup_endpoints(TALLOC_CTX *mem_ctx, struct dcesrv_ep_iface **e)
+{
+	return dcesrv_lookup_endpoints(&dcerpc_table_epmapper, mem_ctx, e);
+}
+
+
+static const struct dcesrv_endpoint_ops rpc_epmapper_ops = {
+	op_query_endpoint,
+	op_set_interface,
+	op_connect,
+	op_disconnect,
+	op_lookup_endpoints
+};
+
+/*
+  register with the dcerpc server
+*/
+void rpc_epmapper_init(struct server_context *smb)
+{
+	if (!dcesrv_endpoint_register(smb, &rpc_epmapper_ops)) {
+		DEBUG(1,("Failed to register epmapper endpoint\n"));
+	}
+}