CLEANUP: tools: make ipcpy() preserve the original port
ipcpy() is used to replace an IP address with another one, but it
doesn't preserve the original port so all callers have to do it
manually while it's trivial to do there. Better do it inside the
function.
diff --git a/src/standard.c b/src/standard.c
index e25d38e..fed8477 100644
--- a/src/standard.c
+++ b/src/standard.c
@@ -2598,20 +2598,29 @@
}
/* copy IP address from <source> into <dest>
- * the caller must allocate and clear <dest> before calling.
- * Returns a pointer to the destination.
+ * The caller must allocate and clear <dest> before calling.
+ * The source must be in either AF_INET or AF_INET6 family, or the destination
+ * address will be undefined. If the destination address used to hold a port,
+ * it is preserved, so that this function can be used to switch to another
+ * address family with no risk. Returns a pointer to the destination.
*/
struct sockaddr_storage *ipcpy(struct sockaddr_storage *source, struct sockaddr_storage *dest)
{
+ int prev_port;
+
+ prev_port = get_net_port(dest);
+ memset(dest, 0, sizeof(*dest));
dest->ss_family = source->ss_family;
/* copy new addr and apply it */
switch (source->ss_family) {
case AF_INET:
((struct sockaddr_in *)dest)->sin_addr.s_addr = ((struct sockaddr_in *)source)->sin_addr.s_addr;
+ ((struct sockaddr_in *)dest)->sin_port = prev_port;
break;
case AF_INET6:
memcpy(((struct sockaddr_in6 *)dest)->sin6_addr.s6_addr, ((struct sockaddr_in6 *)source)->sin6_addr.s6_addr, sizeof(struct in6_addr));
+ ((struct sockaddr_in6 *)dest)->sin6_port = prev_port;
break;
}