From 6fc878f74ce6d37260f29c782cd65a47483083e4 Mon Sep 17 00:00:00 2001
From: Marcel Holtmann <marcel@holtmann.org>
Date: Thu, 11 Dec 2008 16:57:12 +0100
Subject: [PATCH] Add common index to ident conversion helper

---
 plugins/inet.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 plugins/inet.h |  1 +
 2 files changed, 49 insertions(+)

diff --git a/plugins/inet.c b/plugins/inet.c
index e14d33e..ab0fcdc 100644
--- a/plugins/inet.c
+++ b/plugins/inet.c
@@ -26,10 +26,12 @@
 #include <stdio.h>
 #include <errno.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
 #include <net/if.h>
+#include <net/ethernet.h>
 
 #include "inet.h"
 
@@ -57,3 +59,49 @@ char *inet_index2name(int index)
 
 	return strdup(ifr.ifr_name);
 }
+
+char *inet_index2ident(int index, const char *prefix)
+{
+	struct ifreq ifr;
+	struct ether_addr *eth;
+	char *str;
+	int sk, err, len;
+
+	if (index < 0)
+		return NULL;
+
+	sk = socket(PF_INET, SOCK_DGRAM, 0);
+	if (sk < 0)
+		return NULL;
+
+	memset(&ifr, 0, sizeof(ifr));
+	ifr.ifr_ifindex = index;
+
+	err = ioctl(sk, SIOCGIFNAME, &ifr);
+
+	if (err == 0)
+		err = ioctl(sk, SIOCGIFHWADDR, &ifr);
+
+	close(sk);
+
+	if (err < 0)
+		return NULL;
+
+	len = prefix ? strlen(prefix) + 18 : 18;
+
+	str = malloc(len);
+	if (!str)
+		return NULL;
+
+	eth = (void *) &ifr.ifr_hwaddr.sa_data;
+	snprintf(str, len, "%s%02X_%02X_%02X_%02X_%02X_%02X",
+						prefix ? prefix : "",
+						eth->ether_addr_octet[0],
+						eth->ether_addr_octet[1],
+						eth->ether_addr_octet[2],
+						eth->ether_addr_octet[3],
+						eth->ether_addr_octet[4],
+						eth->ether_addr_octet[5]);
+
+	return str;
+}
diff --git a/plugins/inet.h b/plugins/inet.h
index aafd55b..afa8025 100644
--- a/plugins/inet.h
+++ b/plugins/inet.h
@@ -20,3 +20,4 @@
  */
 
 char *inet_index2name(int index);
+char *inet_index2ident(int index, const char *prefix);
-- 
2.7.4