treewide: use if_nametoindex to avoid overflows

[can-utils.git] / slcanpty.c

diff --git a/slcanpty.c b/slcanpty.c
index f485ac775a533b2bfdbb5cd34ee1f564c7ae0abe..5cf14ef9837450262be6220f1af28e453c0f364d 100644 (file)
--- a/slcanpty.c
+++ b/slcanpty.c
@@ -422,7 +422,6 @@ int main(int argc, char **argv)
        int s; /* can raw socket */ 
        struct sockaddr_can addr;
        struct termios topts;
-       struct ifreq ifr;
        int select_stdin = 0;
        int running = 1;
        int tstamp = 0;
@@ -497,13 +496,7 @@ int main(int argc, char **argv)
        }
 
        addr.can_family = AF_CAN;
-
-       strcpy(ifr.ifr_name, argv[2]);
-       if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
-               perror("SIOCGIFINDEX");
-               return 1;
-       }
-       addr.can_ifindex = ifr.ifr_ifindex;
+       addr.can_ifindex = if_nametoindex(argv[2]);
 
        /* disable reception of CAN frames until we are opened by 'O' */
        setsockopt(s, SOL_CAN_RAW, CAN_RAW_FILTER, NULL, 0);