Show symbolic default only for 0.0.0.0/0 (which fixes Suse Bug#821077)

lib/inet.c

@@ -159,20 +159,30 @@ static int INET_rresolve(char *name, size_t len, struct sockaddr_in *sin,
 #ifdef DEBUG
     fprintf (stderr, "rresolve: %08lx, mask %08x, num %08x \n", ad, netmask, numeric);
 #endif
+
+    // if no symbolic names are requested we shortcut with ntoa
+    if (numeric & 0x0FFF) {
+        safe_strncpy(name, inet_ntoa(sin->sin_addr), len);
+	return (0);
+    }
+
+    // we skip getnetbyaddr for 0.0.0.0/0 and 0.0.0.0/~0
     if (ad == INADDR_ANY) {
-	if ((numeric & 0x0FFF) == 0) {
+        if (netmask == INADDR_ANY) {
+            // for 0.0.0.0/0 we hardcode symbolic name
 	    if (numeric & 0x8000)
 		safe_strncpy(name, "default", len);
 	    else
 	        safe_strncpy(name, "*", len);
 	    return (0);
+	} else {
+	    // for 0.0.0.0/1 we skip getnetbyname()
+            safe_strncpy(name, "0.0.0.0", len);
+            return (0);
 	}
     }
-    if (numeric & 0x0FFF) {
-        safe_strncpy(name, inet_ntoa(sin->sin_addr), len);
-	return (0);
-    }
 
+    // it is a host address if flagged or any host bits set
     if ((ad & (~netmask)) != 0 || (numeric & 0x4000))
 	host = 1;
 #if 0