[hackers] [smdev] Add support for renaming network interfaces || sin

[git]

commit eed577a75f4e9ce9658cd83d729a561e18b39b70
Author: sin <s...@2f30.org>
Date:   Thu Sep 4 15:04:26 2014 +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.

diff --git a/config.def.h b/config.def.h
index cdf034c..68ccdca 100644
--- 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
index 252d350..a3194da 100644
--- 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->ifa_addr;
+                       for (i = 0; mac2names[i].name; i++) {
+                               if (memcmp(mac2names[i].mac, sa->sll_addr, 6) 
!= 0)
+                                       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_newname));
+                               r = ioctl(sd, SIOCSIFNAME, &ifr);
+                               if (r < 0)
+                                       eprintf("SIOCSIFNAME:");
+                       }
+               }
+       }
+
+       close(sd);
+       return 0;
+}