Don't convert an ip to another ip; only convert a hostname to an ip

util/sock.cpp

@@ -22,9 +22,12 @@
 namespace mongo {
 
     static boost::mutex sock_mutex;
-// .empty() if err
+
     string hostbyname(const char *hostname) {
         boostlock lk(sock_mutex);
+        struct in_addr temp;
+        if ( inet_aton( hostname, &temp ) )
+            return hostname;
         struct hostent *h;
         h = gethostbyname(hostname);
         if ( h == 0 ) return "";

util/sock.h

@@ -96,7 +96,8 @@ namespace mongo {
         }
     }
 
-// .empty() if err
+    // If an ip address is passed in, just return that.  If a hostname is passed
+    // in, look up its ip and return that.  Returns "" on failure.
     string hostbyname(const char *hostname);
 
     struct SockAddr {