1 files changed, 49 insertions, 0 deletions
diff --git a/devices.c b/devices.c
new file mode 100644
index 0000000..14ba5c4
--- /dev/null
+++ b/devices.c
@@ -0,0 +1,49 @@
+#include <stdlib.h>
+#include <string.h>
+#include <malloc.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+
+int getDeviceIndex(int sockfd, unsigned char *deviceName) {
+	struct ifreq ifr;
+
+	strncpy(ifr.ifr_name, deviceName, 16);
+	if (ioctl(sockfd, SIOCGIFINDEX, &ifr) != 0) {
+		return -1;
+	}
+
+	return ifr.ifr_ifindex;
+}
+
+int getDeviceIp(const int sockfd, const unsigned char *deviceName, struct sockaddr_in *ip) {
+	struct ifconf ifc;
+	struct ifreq *ifr;
+	int i,numDevices;
+
+	memset(&ifc, 0, sizeof(ifc));
+	if (ioctl(sockfd, SIOCGIFCONF, &ifc) != 0) {
+		return -1;
+	}
+
+	if ((ifr = malloc(ifc.ifc_len * 2)) == NULL) {
+		perror("malloc");
+		exit(1);
+	}
+
+	ifc.ifc_req = ifr;
+
+	if (ioctl(sockfd, SIOCGIFCONF, &ifc) != 0) {
+                return -1;
+        }
+
+	numDevices = ifc.ifc_len / sizeof(struct ifreq);
+	for (i = 0; i < numDevices; ++i) {
+		if (strcmp(ifr[i].ifr_name, deviceName) == 0) {
+			memcpy(ip, &(ifr[i].ifr_addr), sizeof(ip));
+			return 1;
+		}
+	}
+	return -1;
+}