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.

1 files changed, 26 insertions, 0 deletions

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;
+}