r4951: some of the code dealing with libcli was getting too complex trying to

handle the inverted memory hierarchy that a normal session
establishment gave. The inverted hierarchy came from that fact that
you first establish a socket, then a transport, then a session and
finally a tree. That leads to the socket being at the top of the
memory hierarchy and the tree at the bottom, which makes no sense from
the users point of view, as they want to be able to free the tree and
have everything disappear.

The core problem was that the libcli interface didn't distinguish
between establishing a primary context and a secondary context. If you
establish a 2nd session on a transport then you want the transport to
be referenced by the session, whereas if you establish a primary
session then you want the transport to be a child of the session.

To fix this I have added "parent_ctx" and "primary" arguments to the
libcli intialisation functions. This makes using the library much
easier, and gives us a memory hierarchy that makes much more sense.

I was prompted to do this by a bug in the cifs backend, which was
caused by the socket not being properly torn down on a disconnect due
to the inverted memory hierarchy.
(This used to be commit 5e8fd5f70178992e249805c2e1ddafaf6840739b)

1 files changed, 3 insertions, 14 deletions

diff --git a/source4/torture/rpc/xplogin.c b/source4/torture/rpc/xplogin.c
index 25bda40da9..3c4a881d96 100644
--- a/source4/torture/rpc/xplogin.c
+++ b/source4/torture/rpc/xplogin.c
@@ -28,13 +28,6 @@
 #include "librpc/gen_ndr/ndr_srvsvc.h"
 #include "libcli/composite/composite.h"
 
-static int destroy_transport(void *ptr)
-{
-	struct smbcli_transport *trans = ptr;
-	talloc_free(trans->socket);
-	return 0;
-}
-
 static NTSTATUS after_negprot(struct smbcli_transport **dst_transport,
 			      const char *dest_host, uint16_t port,
 			      const char *my_name)
@@ -54,13 +47,10 @@ static NTSTATUS after_negprot(struct smbcli_transport **dst_transport,
 		return NT_STATUS_UNSUCCESSFUL;
 	}
 
-	transport = smbcli_transport_init(sock);
-	talloc_free(sock);
+	transport = smbcli_transport_init(sock, NULL, True);
 	if (transport == NULL)
 		return NT_STATUS_NO_MEMORY;
 
-	talloc_set_destructor(transport, destroy_transport);
-
 	{
 		struct nbt_name calling;
 		struct nbt_name called;
@@ -115,7 +105,7 @@ static NTSTATUS anon_ipc(struct smbcli_transport *transport,
 	TALLOC_CTX *mem_ctx;
 	NTSTATUS status;
 
-	session = smbcli_session_init(transport);
+	session = smbcli_session_init(transport, NULL, True);
 	if (session == NULL)
 		return NT_STATUS_NO_MEMORY;
 
@@ -144,8 +134,7 @@ static NTSTATUS anon_ipc(struct smbcli_transport *transport,
 
 	talloc_set_destructor(session, destroy_session);
 
-	tree = smbcli_tree_init(session);
-	talloc_free(session);
+	tree = smbcli_tree_init(session, NULL, True);
 	if (tree == NULL) {
 		talloc_free(mem_ctx);
 		return NT_STATUS_NO_MEMORY;