1 files changed, 39 insertions, 0 deletions
diff --git a/src/interface.c b/src/interface.c
index 78602b0..1b6c941 100644
--- a/src/interface.c
+++ b/src/interface.c
@@ -25,6 +25,7 @@
 #include <assert.h>
 #include <unistd.h>
 #include <sys/ioctl.h>
+#include <netinet/in.h>
 
 #include <libdaemon/dlog.h>
 
@@ -65,3 +66,41 @@ void interface_close(struct interface *i) {
     free(i);
 }
 
+
+void interface_up(struct interface *i) {
+    struct ifreq ifr;
+    assert(i && i->fd >= 0 && i->name);
+    
+    memset(&ifr, 0, sizeof(ifr));
+    strncpy(ifr.ifr_name, i->name, sizeof(ifr.ifr_name)-1);
+    
+    if (ioctl(i->fd, SIOCGIFFLAGS, &ifr) < 0) {
+        daemon_log(LOG_WARNING, "Warning: Could not get interface flags.");
+        return;
+    }
+
+    if ((ifr.ifr_flags & IFF_UP) == IFF_UP)
+        return;
+    
+    if (ioctl(i->fd, SIOCGIFADDR, &ifr) < 0)
+        daemon_log(LOG_WARNING, "Warning: Could not get interface address.");
+    else if (ifr.ifr_addr.sa_family != AF_INET)
+        daemon_log(LOG_WARNING, "Warning: The interface is not IP-based.");
+    else {
+        ((struct sockaddr_in *)(&ifr.ifr_addr))->sin_addr.s_addr = INADDR_ANY;
+        if (ioctl(i->fd, SIOCSIFADDR, &ifr) < 0)
+            daemon_log(LOG_WARNING, "Warning: Could not set interface address.");
+    }
+
+    if (ioctl(i->fd, SIOCGIFFLAGS, &ifr) < 0) {
+        daemon_log(LOG_WARNING, "Warning: Could not get interface flags.");
+        return;
+    }
+    
+    ifr.ifr_flags |= IFF_UP;
+    
+    if (ioctl(i->fd, SIOCSIFFLAGS, &ifr) < 0)
+        daemon_log(LOG_WARNING, "Warning: Could not set interface flags.");
+
+    daemon_log(LOG_INFO, "Interface set to status UP.");
+}