1 files changed, 43 insertions, 0 deletions
diff --git a/src/get_ip_addr.c b/src/get_ip_addr.c
new file mode 100644
index 0000000..de03d8c
--- /dev/null
+++ b/src/get_ip_addr.c
@@ -0,0 +1,43 @@
+#include <net/if.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <netdb.h>
+
+#include "i3status.h"
+
+/*
+ * Return the IP address for the given interface or "no IP" if the
+ * interface is up and running but hasn't got an IP address yet
+ *
+ */
+const char *get_ip_addr(const char *interface) {
+        static char part[512];
+        struct ifreq ifr;
+        socklen_t len = sizeof(struct sockaddr_in);
+        memset(part, 0, sizeof(part));
+
+        /* First check if the interface is running */
+        (void)strcpy(ifr.ifr_name, interface);
+        if (ioctl(general_socket, SIOCGIFFLAGS, &ifr) < 0 ||
+            !(ifr.ifr_flags & IFF_RUNNING))
+                return NULL;
+
+        /* Interface is up, get the IP address */
+        (void)strcpy(ifr.ifr_name, interface);
+        ifr.ifr_addr.sa_family = AF_INET;
+        if (ioctl(general_socket, SIOCGIFADDR, &ifr) < 0)
+                return "no IP";
+
+	int ret;
+	if ((ret = getnameinfo(&ifr.ifr_addr, len, part, sizeof(part), NULL, 0, NI_NUMERICHOST)) != 0) {
+		fprintf(stderr, "getnameinfo(): %s\n", gai_strerror(ret));
+		return "no IP";
+	}
+
+        return part;
+}
+