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authorVadim Kochan <vadim4j@gmail.com>2016-01-26 22:25:00 +0200
committerTobias Klauser <tklauser@distanz.ch>2016-01-28 16:04:47 +0100
commitb5100e276763a03c255dd1e7a4147c55c901419c (patch)
treecdd4cfd2915d4ce04ca2d6cd494b2264635dc1b4 /dev.c
parente476a36e65cd8508c6473a19e497fb04487e2214 (diff)
dev: Add function to get device hardware address
Add device_hw_address() function to get device MAC address. Signed-off-by: Vadim Kochan <vadim4j@gmail.com> [tk: Add len parameter and error out on too short buffers] Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Diffstat (limited to 'dev.c')
-rw-r--r--dev.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/dev.c b/dev.c
index cf8d643..5a43643 100644
--- a/dev.c
+++ b/dev.c
@@ -124,6 +124,31 @@ int device_address(const char *ifname, int af, struct sockaddr_storage *ss)
return ret;
}
+int device_hw_address(const char *ifname, uint8_t *addr, size_t len)
+{
+ int ret, sock;
+ struct ifreq ifr;
+
+ if (!addr)
+ return -EINVAL;
+ if (len < IFHWADDRLEN)
+ return -ENOSPC;
+ if (!strncmp("any", ifname, strlen("any")))
+ return -EINVAL;
+
+ sock = af_socket(AF_INET);
+
+ memset(&ifr, 0, sizeof(ifr));
+ strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
+
+ ret = ioctl(sock, SIOCGIFHWADDR, &ifr);
+ if (!ret)
+ memcpy(addr, &ifr.ifr_hwaddr.sa_data[0], IFHWADDRLEN);
+
+ close(sock);
+ return ret;
+}
+
size_t device_mtu(const char *ifname)
{
size_t mtu = 0;