Looks good.
Regards,
Hans
On 05/21/2009 10:16 PM, Chris Lumens wrote:
---
isys/iface.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
isys/iface.h | 5 +++++
2 files changed, 53 insertions(+), 0 deletions(-)
diff --git a/isys/iface.c b/isys/iface.c
index 1371802..e139e74 100644
--- a/isys/iface.c
+++ b/isys/iface.c
@@ -222,6 +222,54 @@ char *iface_ip2str(char *ifname, int family) {
return NULL;
}
+/* Given an interface's MAC address, return the name (e.g., eth0) in human
+ * readable format. Return NULL for no match
+ */
+char *iface_mac2device(char *mac) {
+ struct nl_handle *handle = NULL;
+ struct nl_cache *cache = NULL;
+ struct rtnl_link *link = NULL;
+ struct nl_addr *mac_as_nl_addr = NULL;
+ char *retval = NULL;
+ int i, n;
+
+ if (mac == NULL) {
+ return NULL;
+ }
+
+ if ((mac_as_nl_addr = nl_addr_parse(mac, AF_LLC)) == NULL) {
+ return NULL;
+ }
+
+ if ((cache = _iface_get_link_cache(&handle)) == NULL) {
+ return NULL;
+ }
+
+ n = nl_cache_nitems(cache);
+ for (i = 0; i<= n; i++) {
+ struct nl_addr *addr;
+
+ if ((link = rtnl_link_get(cache, i)) == NULL) {
+ continue;
+ }
+
+ addr = rtnl_link_get_addr(link);
+
+ if (!nl_addr_cmp(mac_as_nl_addr, addr)) {
+ retval = strdup(rtnl_link_get_name(link));
+ rtnl_link_put(link);
+ break;
+ }
+
+ rtnl_link_put(link);
+ }
+
+ nl_close(handle);
+ nl_handle_destroy(handle);
+
+ return retval;
+}
+
/*
* Given an interface name (e.g., eth0), return the MAC address in human
* readable format (e.g., 00:11:52:12:D9:A0). Return NULL for no match.
diff --git a/isys/iface.h b/isys/iface.h
index 16257bc..f678932 100644
--- a/isys/iface.h
+++ b/isys/iface.h
@@ -118,6 +118,11 @@ char *iface_ip2str(char *, int);
*/
char *iface_mac2str(char *);
+/* Given an interface's MAC address, return the name (e.g., eth0) in human
+ * readable format. Return NULL for no match
+ */
+char *iface_mac2device(char *);
+
/*
* Convert an IPv4 CIDR prefix to a dotted-quad netmask. Return NULL on
* failure.
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