imessaging: Add irpc_all_servers() to list all available servers

This is implemented with a tdb_traverse_read(), and will allow a tool
to disover the name and server_id of all Samba processes, as each
process registers itself to recieve messages.

Andrew Bartlett

3 files changed, 85 insertions, 1 deletions

diff --git a/source4/lib/messaging/irpc.h b/source4/lib/messaging/irpc.h
index 15f8259e51..456d1906e0 100644
--- a/source4/lib/messaging/irpc.h
+++ b/source4/lib/messaging/irpc.h
@@ -75,6 +75,8 @@ void irpc_binding_handle_add_security_token(struct dcerpc_binding_handle *h,
 
 NTSTATUS irpc_add_name(struct imessaging_context *msg_ctx, const char *name);
 struct server_id *irpc_servers_byname(struct imessaging_context *msg_ctx, TALLOC_CTX *mem_ctx, const char *name);
+struct irpc_name_records *irpc_all_servers(struct imessaging_context *msg_ctx,
+					   TALLOC_CTX *mem_ctx);
 void irpc_remove_name(struct imessaging_context *msg_ctx, const char *name);
 NTSTATUS irpc_send_reply(struct irpc_message *m, NTSTATUS status);
 
diff --git a/source4/lib/messaging/messaging.c b/source4/lib/messaging/messaging.c
index 4d69b9424b..66188971f3 100644
--- a/source4/lib/messaging/messaging.c
+++ b/source4/lib/messaging/messaging.c
@@ -985,6 +985,77 @@ struct server_id *irpc_servers_byname(struct imessaging_context *msg_ctx,
 	return ret;
 }
 
+static int all_servers_func(struct tdb_context *tdb, TDB_DATA key, TDB_DATA data, void *state)
+{
+	struct irpc_name_records *name_records = talloc_get_type(state, struct irpc_name_records);
+	struct irpc_name_record *name_record;
+	int i;
+
+	name_records->names
+		= talloc_realloc(name_records, name_records->names,
+				 struct irpc_name_record *, name_records->num_records+1);
+	if (!name_records->names) {
+		return -1;
+	}
+
+	name_records->names[name_records->num_records] = name_record
+		= talloc(name_records->names,
+			 struct irpc_name_record);
+	if (!name_record) {
+		return -1;
+	}
+
+	name_records->num_records++;
+
+	name_record->name
+		= talloc_strndup(name_record,
+				 (const char *)key.dptr, key.dsize);
+	if (!name_record->name) {
+		return -1;
+	}
+
+	name_record->count = data.dsize / sizeof(struct server_id);
+	name_record->ids = talloc_array(name_record,
+					struct server_id,
+					name_record->count);
+	if (name_record->ids == NULL) {
+		return -1;
+	}
+	for (i=0;i<name_record->count;i++) {
+		name_record->ids[i] = ((struct server_id *)data.dptr)[i];
+	}
+	return 0;
+}
+
+/*
+  return a list of server ids for a server name
+*/
+struct irpc_name_records *irpc_all_servers(struct imessaging_context *msg_ctx,
+					   TALLOC_CTX *mem_ctx)
+{
+	struct tdb_wrap *t;
+	int ret;
+	struct irpc_name_records *name_records = talloc_zero(mem_ctx, struct irpc_name_records);
+	if (name_records == NULL) {
+		return NULL;
+	}
+
+	t = irpc_namedb_open(msg_ctx);
+	if (t == NULL) {
+		return NULL;
+	}
+
+	ret = tdb_traverse_read(t->tdb, all_servers_func, name_records);
+	if (ret == -1) {
+		talloc_free(t);
+		return NULL;
+	}
+
+	talloc_free(t);
+
+	return name_records;
+}
+
 /*
   remove a name from a messaging context
 */
diff --git a/source4/librpc/idl/irpc.idl b/source4/librpc/idl/irpc.idl
index ed331c7fdb..6a55eef953 100644
--- a/source4/librpc/idl/irpc.idl
+++ b/source4/librpc/idl/irpc.idl
@@ -1,6 +1,6 @@
 #include "idl_types.h"
 
-import "misc.idl", "security.idl", "nbt.idl", "netlogon.idl";
+import "misc.idl", "security.idl", "nbt.idl", "netlogon.idl", "server_id.idl";
 
 /*
   definitions for irpc primitives
@@ -29,6 +29,17 @@ import "misc.idl", "security.idl", "nbt.idl", "netlogon.idl";
 		[flag(NDR_ALIGN8)] DATA_BLOB _pad;
 	} irpc_header;
 
+	typedef [public] struct {
+		utf8string name;
+		uint32 count;
+		[size_is(count)] server_id ids[*];
+	} irpc_name_record;
+
+	typedef [public] struct {
+		[size_is(num_records)] irpc_name_record *names[*];
+		uint32 num_records;
+	} irpc_name_records;
+
 	/******************************************************
          uptime call - supported by all messaging servers
 	*******************************************************/