libcli/smb2: make it possible to handle incoming oplock requests

metze
(This used to be commit 58189b87eade62b717c2c17c679e482786bf2098)

2 files changed, 54 insertions, 0 deletions

diff --git a/source4/libcli/smb2/smb2.h b/source4/libcli/smb2/smb2.h
index 726df64090..ae66a6e0d3 100644
--- a/source4/libcli/smb2/smb2.h
+++ b/source4/libcli/smb2/smb2.h
@@ -21,6 +21,8 @@
 
 #include "libcli/raw/request.h"
 
+struct smb2_handle;
+
 struct smb2_options {
 	uint32_t timeout;
 };
@@ -58,6 +60,15 @@ struct smb2_transport {
 		void *private;
 		uint_t period;
 	} idle;
+
+	struct {
+		/* a oplock break request handler */
+		bool (*handler)(struct smb2_transport *transport,
+				const struct smb2_handle *handle,
+				uint8_t level, void *private_data);
+		/* private data passed to the oplock handler */
+		void *private_data;
+	} oplock;
 };
 
 
diff --git a/source4/libcli/smb2/transport.c b/source4/libcli/smb2/transport.c
index af19fcb0a9..8eb60a06f1 100644
--- a/source4/libcli/smb2/transport.c
+++ b/source4/libcli/smb2/transport.c
@@ -140,6 +140,44 @@ void smb2_transport_dead(struct smb2_transport *transport, NTSTATUS status)
 	}
 }
 
+static bool smb2_handle_oplock_break(struct smb2_transport *transport,
+				     const DATA_BLOB *blob)
+{
+	uint8_t *hdr;
+	uint16_t opcode;
+	uint64_t seqnum;
+
+	hdr = blob->data+NBT_HDR_SIZE;
+
+	if (blob->length < (SMB2_MIN_SIZE+0x18)) {
+		DEBUG(1,("Discarding smb2 oplock reply of size %u\n",
+			 blob->length));
+		return false;
+	}
+
+	opcode	= SVAL(hdr, SMB2_HDR_OPCODE);
+	seqnum	= BVAL(hdr, SMB2_HDR_MESSAGE_ID);
+
+	if ((opcode != SMB2_OP_BREAK) ||
+	    (seqnum != UINT64_MAX)) {
+		return false;
+	}
+
+	if (transport->oplock.handler) {
+		uint8_t *body = hdr+SMB2_HDR_BODY;
+		struct smb2_handle h;
+		uint8_t level;
+
+		level = CVAL(body, 0x02);
+		smb2_pull_handle(body+0x08, &h);
+
+		transport->oplock.handler(transport, &h, level,
+					  transport->oplock.private_data);
+	}
+
+	return true;
+}
+
 /*
   we have a full request in our receive buffer - match it to a pending request
   and process
@@ -167,6 +205,11 @@ static NTSTATUS smb2_transport_finish_recv(void *private, DATA_BLOB blob)
 		goto error;
 	}
 
+	if (smb2_handle_oplock_break(transport, &blob)) {
+		talloc_free(buffer);
+		return NT_STATUS_OK;
+	}
+
 	flags	= IVAL(hdr, SMB2_HDR_FLAGS);
 	seqnum	= BVAL(hdr, SMB2_HDR_MESSAGE_ID);