Get MAC of TAP device.

[tinc] / src / linux / device.c

diff --git a/src/linux/device.c b/src/linux/device.c
index d418aaf..8d042d2 100644 (file)
--- a/src/linux/device.c
+++ b/src/linux/device.c
@@ -1,7 +1,7 @@
 /*
     device.c -- Interaction with Linux ethertap and tun/tap device
     Copyright (C) 2001-2005 Ivo Timmermans,
-                  2001-2013 Guus Sliepen <guus@tinc-vpn.org>
+                  2001-2014 Guus Sliepen <guus@tinc-vpn.org>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -107,17 +107,21 @@ static bool setup_device(void) {
                ifr.ifr_flags |= IFF_ONE_QUEUE;
 #endif
 
-       if(iface)
+       if(iface) {
                strncpy(ifr.ifr_name, iface, IFNAMSIZ);
+               ifr.ifr_name[IFNAMSIZ - 1] = 0;
+       }
 
        if(!ioctl(device_fd, TUNSETIFF, &ifr)) {
                strncpy(ifrname, ifr.ifr_name, IFNAMSIZ);
-               if(iface) free(iface);
+               ifrname[IFNAMSIZ - 1] = 0;
+               free(iface);
                iface = xstrdup(ifrname);
        } else if(!ioctl(device_fd, (('T' << 8) | 202), &ifr)) {
                logger(LOG_WARNING, "Old ioctl() request was needed for %s", device);
                strncpy(ifrname, ifr.ifr_name, IFNAMSIZ);
-               if(iface) free(iface);
+               ifrname[IFNAMSIZ - 1] = 0;
+               free(iface);
                iface = xstrdup(ifrname);
        } else
 #endif
@@ -126,11 +130,13 @@ static bool setup_device(void) {
                        overwrite_mac = true;
                device_info = "Linux ethertap device";
                device_type = DEVICE_TYPE_ETHERTAP;
-               if(iface)
-                       free(iface);
+               free(iface);
                iface = xstrdup(strrchr(device, '/') ? strrchr(device, '/') + 1 : device);
        }
 
+       if(overwrite_mac && !ioctl(device_fd, SIOCGIFHWADDR, &ifr))
+               memcpy(mymac.x, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
+
        logger(LOG_INFO, "%s is a %s", device, device_info);
 
        return true;