* network_io/unix/multicast.c (do_mcast_opt): Fix regression in

  handling IPv4 options introduced in r1309386.


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1487796 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 10 insertions, 2 deletions

diff --git a/network_io/unix/multicast.c b/network_io/unix/multicast.c
index d6e2ca7b7..e4e8c80f1 100644
--- a/network_io/unix/multicast.c
+++ b/network_io/unix/multicast.c
@@ -196,12 +196,17 @@ static apr_status_t do_mcast(int type, apr_socket_t *sock,
     return rv;
 }
 
+/* Set the IP_MULTICAST_TTL or IP_MULTICAST_LOOP option, or IPv6
+ * equivalents, for the socket, to the given value.  Note that this
+ * function *only works* for those particular option types. */
 static apr_status_t do_mcast_opt(int type, apr_socket_t *sock,
-                                 apr_uint32_t value)
+                                 apr_byte_t value)
 {
     apr_status_t rv = APR_SUCCESS;
 
     if (sock_is_ipv4(sock)) {
+        /* For the IP_MULTICAST_* options, this must be a (char *)
+         * pointer. */
         if (setsockopt(sock->socketdes, IPPROTO_IP, type,
                        (const void *) &value, sizeof(value)) == -1) {
             rv = errno;
@@ -209,6 +214,9 @@ static apr_status_t do_mcast_opt(int type, apr_socket_t *sock,
     }
 #if APR_HAVE_IPV6
     else if (sock_is_ipv6(sock)) {
+        /* For the IPV6_* options, an (int *) pointer must be used. */
+        int ivalue = value;
+
         if (type == IP_MULTICAST_TTL) {
             type = IPV6_MULTICAST_HOPS;
         }
@@ -220,7 +228,7 @@ static apr_status_t do_mcast_opt(int type, apr_socket_t *sock,
         }
 
         if (setsockopt(sock->socketdes, IPPROTO_IPV6, type,
-                       (const void *) &value, sizeof(value)) == -1) {
+                       (const void *) &ivalue, sizeof(ivalue)) == -1) {
             rv = errno;
         }
     }