[libvirt] [PATCH 3/3] virnetdev: Add check for unprivileged daemon

[John Ferlan]

Using virNetDevSetupControl (due to usage of AF_PACKET instead of
AF_LOCAL for the socket call) or even ioctl(SIOCETHTOOL) will fail
for an unprivileged daemon. Since in the long run the caller only
cares if bits are found in order to set a bit in a bitmap, let's
just add a VIR_WARN instead of an error message.

Signed-off-by: John Ferlan <jferlan at redhat.com>
---
 src/util/virnetdev.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/util/virnetdev.c b/src/util/virnetdev.c
index d47859e..acf8ba6 100644
--- a/src/util/virnetdev.c
+++ b/src/util/virnetdev.c
@@ -3154,6 +3154,14 @@ virNetDevSendEthtoolIoctl(const char *ifname, void *cmd)
     int fd;
     struct ifreq ifr;
 
+    /* Won't work if not running as root. Rather than generate
+     * error, just WARN and return.
+     */
+    if (geteuid() != 0) {
+        VIR_WARN("cannot get ETHTOOL feature bits");
+        return ret;
+    }
+
     if ((fd = virNetDevSetupControl(ifname, &ifr)) < 0)
         return ret;
     ifr.ifr_data = cmd;
-- 
2.1.0