From fe3e42bdcbaa3bcb336227b8d2a7aad73c636047 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Mon, 18 Aug 2014 19:19:45 +0200
Subject: Add osmo_get_macaddr() function to obtain etherent mac address

This used to be private in osmo-bts/common/abis.c, where it really
didn't belong.
---
 include/osmocom/core/macaddr.h |  1 +
 src/macaddr.c                  | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/include/osmocom/core/macaddr.h b/include/osmocom/core/macaddr.h
index 517977bb..3a4e67ff 100644
--- a/include/osmocom/core/macaddr.h
+++ b/include/osmocom/core/macaddr.h
@@ -2,5 +2,6 @@
 #define _OSMO_MACADDR_H
 
 int osmo_macaddr_parse(uint8_t *out, const char *in);
+int osmo_get_macaddr(uint8_t *mac_out, const char *dev_name);
 
 #endif
diff --git a/src/macaddr.c b/src/macaddr.c
index 1181dfe5..8b78cb6f 100644
--- a/src/macaddr.c
+++ b/src/macaddr.c
@@ -23,3 +23,29 @@ int osmo_macaddr_parse(uint8_t *out, const char *in)
 
 	return 0;
 }
+
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <netinet/ip.h>
+
+int osmo_get_macaddr(uint8_t *mac_out, const char *dev_name)
+{
+	int fd, rc;
+	struct ifreq ifr;
+
+	fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
+	if (fd < 0)
+		return fd;
+
+	memset(&ifr, 0, sizeof(ifr));
+	memcpy(&ifr.ifr_name, dev_name, sizeof(ifr.ifr_name));
+	rc = ioctl(fd, SIOCGIFHWADDR, &ifr);
+	close(fd);
+
+	if (rc < 0)
+		return rc;
+
+	memcpy(mac_out, ifr.ifr_hwaddr.sa_data, 6);
+
+	return 0;
+}
-- 
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