Better handling of IPv4 connections in IPv6 mode. (Wrapping/Unwrapping of ::ffff:style addresses.)

1 files changed, 40 insertions, 0 deletions

diff --git a/util.c b/util.c
index 3fad6314..e4b58090 100644
--- a/util.c
+++ b/util.c
@@ -402,3 +402,43 @@ char *strip_newlines( char *source )
 	
 	return source;
 }
+
+#ifdef IPV6
+/* Wrap an IPv4 address into IPv6 space. Not thread-safe... */
+char *ipv6_wrap( char *src )
+{
+	static char dst[64];
+	int i;
+	
+	for( i = 0; src[i]; i ++ )
+		if( ( src[i] < '0' || src[i] > '9' ) && src[i] != '.' )
+			break;
+	
+	/* Hmm, it's not even an IP... */
+	if( src[i] )
+		return src;
+	
+	g_snprintf( dst, sizeof( dst ), "::ffff:%s", src );
+	
+	return dst;
+}
+
+/* Unwrap an IPv4 address into IPv6 space. Thread-safe, because it's very simple. :-) */
+char *ipv6_unwrap( char *src )
+{
+	int i;
+	
+	if( g_strncasecmp( src, "::ffff:", 7 ) != 0 )
+		return src;
+	
+	for( i = 7; src[i]; i ++ )
+		if( ( src[i] < '0' || src[i] > '9' ) && src[i] != '.' )
+			break;
+	
+	/* Hmm, it's not even an IP... */
+	if( src[i] )
+		return src;
+	
+	return ( src + 7 );
+}
+#endif