Check interfaces: when reading the public addresses file to create the vnn list

[sahlberg/ctdb.git] / common / system_linux.c

diff --git a/common/system_linux.c b/common/system_linux.c
index a498ab2d686999f6b596d526e2b3f8736f1ef64f..2dcdffb3ece1c342c052214b8202fd171bb97d72 100644 (file)
--- a/common/system_linux.c
+++ b/common/system_linux.c
@@ -537,3 +537,25 @@ int ctdb_sys_read_tcp_packet(int s, void *private_data,
 }
 
 
+bool ctdb_sys_check_iface_exists(const char *iface)
+{
+       int s;
+       struct ifreq ifr;
+
+       s = socket(PF_PACKET, SOCK_RAW, 0);
+       if (s == -1){
+               /* We dont know if the interface exists, so assume yes */
+               DEBUG(DEBUG_CRIT,(__location__ " failed to open raw socket\n"));
+               return true;
+       }
+
+       strncpy(ifr.ifr_name, iface, sizeof(ifr.ifr_name));
+       if (ioctl(s, SIOCGIFINDEX, &ifr) < 0 && errno == ENODEV) {
+               DEBUG(DEBUG_CRIT,(__location__ " interface '%s' not found\n", iface));
+               close(s);
+               return false;
+       }
+       close(s);
+       
+       return true;
+}