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	Add support for renaming network interfaces - smdev - suckless mdev
	git clone git://git.suckless.org/smdev
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	---
	commit eed577a75f4e9ce9658cd83d729a561e18b39b70
	parent 801a44b69bb6d791197e3cd4a442ba1cc079a4cf
	Author: sin <[email protected]>
	Date: Thu, 4 Sep 2014 15:04:26 +0100

	Add support for renaming network interfaces

	Since this is the brand new thing, add support for renaming
	network interfaces in smdev. Simply populate the small mac2names[]
	table in config.h.

	By default smdev does not rename network interfaces. There's no
	command line switch to enable renaming, just add entries to the
	table and off you go.

	Diffstat:
	M config.def.h \| 7 +++++++
	M smdev.c \| 48 +++++++++++++++++++++++++++++…

	2 files changed, 55 insertions(+), 0 deletions(-)
	---
	diff --git a/config.def.h b/config.def.h
	@@ -40,3 +40,10 @@ struct rule {
	{ "fuse", "root", "root", 0666, NULL, NULL …
	{ ".*", "root", "root", 0660, NULL, NULL …
	};
	+
	+struct mac2name {
	+ unsigned char mac[6];
	+ const char *name;
	+} mac2names[] = {
	+ { .mac = { 0 }, .name = NULL }
	+};
	diff --git a/smdev.c b/smdev.c
	@@ -1,7 +1,13 @@
	/* See LICENSE file for copyright and license details. */
	+#include <sys/ioctl.h>
	#include <sys/stat.h>
	#include <sys/types.h>

	+#include <linux/if_packet.h>
	+#include <net/if.h>
	+#include <netinet/in.h>
	+#include <ifaddrs.h>
	+
	#include <errno.h>
	#include <fcntl.h>
	#include <grp.h>
	@@ -55,6 +61,7 @@ static int createdev(struct event *ev);
	static int doevent(struct event *ev);
	static int craftev(char *sysfspath);
	static void populatedev(const char *path);
	+static int ifrename(void);

	static void
	usage(void)
	@@ -88,6 +95,8 @@ main(int argc, char *argv[])
	if (pregcache[i].cached)
	regfree(&pregcache[i].preg);

	+ ifrename();
	+
	return 0;
	}

	@@ -386,3 +395,42 @@ populatedev(const char *path)
	free(cwd);
	}
	}
	+
	+static int
	+ifrename(void)
	+{
	+ struct ifaddrs ifas, ifa;
	+ struct ifreq ifr;
	+ int sd;
	+ int i;
	+ int r;
	+
	+ sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
	+ if (sd < 0)
	+ eprintf("socket:");
	+ r = getifaddrs(&ifas);
	+ if (r < 0)
	+ eprintf("getifaddrs:");
	+ for (ifa = ifas; ifa; ifa = ifa->ifa_next) {
	+ if (ifa->ifa_flags & IFF_LOOPBACK)
	+ continue;
	+ if (ifa->ifa_addr->sa_family == AF_PACKET) {
	+ struct sockaddr_ll sa = (struct sockaddr_ll )ifa->if…
	+ for (i = 0; mac2names[i].name; i++) {
	+ if (memcmp(mac2names[i].mac, sa->sll_addr, 6) …
	+ continue;
	+ memset(&ifr, 0, sizeof(ifr));
	+ strlcpy(ifr.ifr_name,
	+ ifa->ifa_name, sizeof(ifr.ifr_name));
	+ strlcpy(ifr.ifr_newname,
	+ mac2names[i].name, sizeof(ifr.ifr_newn…
	+ r = ioctl(sd, SIOCSIFNAME, &ifr);
	+ if (r < 0)
	+ eprintf("SIOCSIFNAME:");
	+ }
	+ }
	+ }
	+
	+ close(sd);
	+ return 0;
	+}