Since AB has been changing the winbind interface it's time to add the "mock

swedish" test to client calls.  This is putting a length field at the
start of a request so we can disconnect clients talking with an out of date
libnss_winbind.so rather than deadlock them.

Misc cleanups:

 - made some int values uint32
 - moved WINBIND_INTERFACE_VERSION to start of cmd list
(This used to be commit a4af65b9b9)

source3/nsswitch/wb_common.c

@@ -58,6 +58,8 @@ void init_request(struct winbindd_request *request, int request_type)
         static char *domain_env;
         static BOOL initialised;
 
+	request->length = sizeof(struct winbindd_request);
+
 	request->cmd = (enum winbindd_cmd)request_type;
 	request->pid = getpid();
 	request->domain[0] = '\0';

source3/nsswitch/winbindd.c

@@ -463,12 +463,14 @@ static void client_read(struct winbindd_cli_state *state)
 	/* Read data */
 
 	do {
-		n = read(state->sock, state->read_buf_len + (char *)&state->request, 
+
-				 sizeof(state->request) - state->read_buf_len);
+		n = read(state->sock, state->read_buf_len + 
+			 (char *)&state->request, 
+			 sizeof(state->request) - state->read_buf_len);
+
 	} while (n == -1 && errno == EINTR);
 	
-	DEBUG(10,("client_read: read %d bytes. Need %d more for a full request.\n", n,
+	DEBUG(10,("client_read: read %d bytes. Need %d more for a full request.\n", n, sizeof(state->request) - n - state->read_buf_len ));
-			sizeof(state->request) - n - state->read_buf_len ));
 
 	/* Read failed, kill client */
 	
@@ -664,8 +666,6 @@ static void process_loop(int accept_sock)
                     
 					client_read(state);
 
-#if 0
-					/* JRA - currently there's no length field in the request... */
 					/* 
 					 * If we have the start of a
 					 * packet, then check the
@@ -674,19 +674,14 @@ static void process_loop(int accept_sock)
 					 * Mock Swedish.
 					 */
 
-					if (state->read_buf_len >= sizeof(int)
+					if (state->read_buf_len >= sizeof(uint32)
-					    && *(int *) state->buf != sizeof(state->request)) {
+					    && *(uint32 *) &state->request != sizeof(state->request)) {
-
-						struct winbindd_cli_state *rem_state = state;
-
 						DEBUG(0,("process_loop: Invalid request size (%d) send, should be (%d)\n",
-								*(int *) rem_state->buf, sizeof(rem_state->request) ));
+								*(uint32 *) &state->request, sizeof(state->request)));
 
-						state = state_next;
+						remove_client(state);
-						remove_client(rem_state);
+						break;
-						continue;
 					}
-#endif
 
 					/* A request packet might be 
 					   complete */

source3/nsswitch/winbindd_nss.h

@@ -35,13 +35,16 @@
 #define WINBINDD_DOMAIN_ENV  "WINBINDD_DOMAIN" /* Environment variables */
 #define WINBINDD_DONT_ENV    "_NO_WINBINDD"
 
+/* Update this when you change the interface.  */
+
+#define WINBIND_INTERFACE_VERSION 2
+
 /* Socket commands */
 
-/* Update this when you change the interface.  */
-#define WINBIND_INTERFACE_VERSION 1
-
 enum winbindd_cmd {
 
+	WINBINDD_INTERFACE_VERSION,    /* Always a well known value */
+
 	/* Get users and groups */
 
 	WINBINDD_GETPWNAM,
@@ -88,7 +91,6 @@ enum winbindd_cmd {
 	WINBINDD_CHECK_MACHACC,     /* Check machine account pw works */
 	WINBINDD_PING,              /* Just tell me winbind is running */
 	WINBINDD_INFO,              /* Various bit of info.  Currently just tidbits */
-	WINBINDD_INTERFACE_VERSION, /* *TRY* to keep this in the same place... */
 
 	/* Placeholder for end of cmd list */
 
@@ -98,6 +100,7 @@ enum winbindd_cmd {
 /* Winbind request structure */
 
 struct winbindd_request {
+	uint32 length;
 	enum winbindd_cmd cmd;   /* Winbindd command to execute */
 	pid_t pid;               /* pid of calling process */
 
@@ -144,7 +147,7 @@ struct winbindd_response {
     
 	/* Header information */
 
-	int length;                           /* Length of response */
+	uint32 length;                        /* Length of response */
 	enum winbindd_result result;          /* Result code */
 
 	/* Fixed length return data */