1 files changed, 112 insertions, 5 deletions

diff --git a/source3/lib/interfaces.c b/source3/lib/interfaces.c
index ee5d9dfb54..48fe249034 100644
--- a/source3/lib/interfaces.c
+++ b/source3/lib/interfaces.c
@@ -88,6 +88,104 @@
 #include "lib/replace/replace.h"
 
 /****************************************************************************
+ Utility functions.
+****************************************************************************/
+
+/****************************************************************************
+ Create a struct sockaddr_storage with the netmask bits set to 1.
+****************************************************************************/
+
+bool make_netmask(struct sockaddr_storage *pss_out,
+			const struct sockaddr_storage *pss_in,
+			unsigned long masklen)
+{
+	*pss_out = *pss_in;
+	/* Now apply masklen bits of mask. */
+#if defined(HAVE_IPV6)
+	if (pss_in->ss_family == AF_INET6) {
+		char *p = (char *)&((struct sockaddr_in6 *)pss_out)->sin6_addr;
+		unsigned int i;
+
+		if (masklen > 128) {
+			return false;
+		}
+		for (i = 0; masklen >= 8; masklen -= 8, i++) {
+			*p++ = 0xff;
+		}
+		/* Deal with the partial byte. */
+		*p++ &= (0xff & ~(0xff>>masklen));
+		i++;
+		for (;i < sizeof(struct in6_addr); i++) {
+			*p++ = '\0';
+		}
+		return true;
+	}
+#endif
+	if (pss_in->ss_family == AF_INET) {
+		if (masklen > 32) {
+			return false;
+		}
+		((struct sockaddr_in *)pss_out)->sin_addr.s_addr =
+			htonl(((0xFFFFFFFFL >> masklen) ^ 0xFFFFFFFFL));
+		return true;
+	}
+	return false;
+}
+
+/****************************************************************************
+ Create a struct sockaddr_storage set to the broadcast or network adress from
+ an incoming sockaddr_storage.
+****************************************************************************/
+
+static void make_bcast_or_net(struct sockaddr_storage *pss_out,
+			const struct sockaddr_storage *pss_in,
+			const struct sockaddr_storage *nmask,
+			bool make_bcast)
+{
+	unsigned int i = 0, len = 0;
+	char *pmask = NULL;
+	char *p = NULL;
+	*pss_out = *pss_in;
+
+	/* Set all zero netmask bits to 1. */
+#if defined(HAVE_IPV6)
+	if (pss_in->ss_family == AF_INET6) {
+		p = (char *)&((struct sockaddr_in6 *)pss_out)->sin6_addr;
+		pmask = (char *)&((struct sockaddr_in6 *)nmask)->sin6_addr;
+		len = 16;
+	}
+#endif
+	if (pss_in->ss_family == AF_INET) {
+		p = (char *)&((struct sockaddr_in *)pss_out)->sin_addr;
+		pmask = (char *)&((struct sockaddr_in *)nmask)->sin_addr;
+		len = 4;
+	}
+
+	for (i = 0; i < len; i++, p++, pmask++) {
+		if (make_bcast) {
+			*p = (*p & *pmask) | (*pmask ^ 0xff);
+		} else {
+			/* make_net */
+			*p = (*p & *pmask);
+		}
+	}
+}
+
+void make_bcast(struct sockaddr_storage *pss_out,
+			const struct sockaddr_storage *pss_in,
+			const struct sockaddr_storage *nmask)
+{
+	make_bcast_or_net(pss_out, pss_in, nmask, true);
+}
+
+void make_net(struct sockaddr_storage *pss_out,
+			const struct sockaddr_storage *pss_in,
+			const struct sockaddr_storage *nmask)
+{
+	make_bcast_or_net(pss_out, pss_in, nmask, false);
+}
+
+/****************************************************************************
  Try the "standard" getifaddrs/freeifaddrs interfaces.
  Also gets IPv6 interfaces.
 ****************************************************************************/
@@ -137,11 +235,20 @@ static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces)
 		memcpy(&ifaces[total].ip, ifptr->ifa_addr, copy_size);
 		memcpy(&ifaces[total].netmask, ifptr->ifa_netmask, copy_size);
 
-		if ((ifaces[total].flags & (IFF_BROADCAST|IFF_LOOPBACK)) &&
-				ifptr->ifa_broadaddr) {
-			memcpy(&ifaces[total].bcast,
-				ifptr->ifa_broadaddr,
-				copy_size);
+		if (ifaces[total].flags & (IFF_BROADCAST|IFF_LOOPBACK)) {
+			if (ifptr->ifa_broadaddr) {
+				memcpy(&ifaces[total].bcast,
+					ifptr->ifa_broadaddr,
+					copy_size);
+			} else {
+				/* For some reason ifptr->ifa_broadaddr
+				 * is null. Make one from ifa_addr and
+				 * ifa_netmask.
+				 */
+				make_bcast(&ifaces[total].bcast,
+					&ifaces[total].ip,
+					&ifaces[total].netmask);
+			}
 		} else if ((ifaces[total].flags & IFF_POINTOPOINT) &&
 			       ifptr->ifa_dstaddr ) {
 			memcpy(&ifaces[total].bcast,