fix missed option argument for -I <device>, interface name checks

redesigned, patch by Nick Fedchik

diff --git a/networking/arping.c b/networking/arping.c
index a0bfdaa..af44f92 100644 (file)
--- a/networking/arping.c
+++ b/networking/arping.c
@@ -63,8 +63,9 @@ static void set_signal(int signo, void (*handler) (void))
 }
 #endif
 
-static int send_pack(int sock, struct in_addr *src_addr, struct in_addr *dst_addr,
-                         struct sockaddr_ll *ME, struct sockaddr_ll *HE)
+static int send_pack(int sock, struct in_addr *src_addr,
+                                        struct in_addr *dst_addr, struct sockaddr_ll *ME,
+                                        struct sockaddr_ll *HE)
 {
        int err;
        struct timeval now;
@@ -274,7 +275,7 @@ int arping_main(int argc, char **argv)
 
        setuid(uid);
 
-       while ((ch = getopt(argc, argv, "h?bfDUAqc:w:s:I")) != EOF) {
+       while ((ch = getopt(argc, argv, "h?bfDUAqc:w:s:I:")) != EOF) {
                switch (ch) {
                case 'b':
                        broadcast_only = 1;
@@ -300,6 +301,13 @@ int arping_main(int argc, char **argv)
                        timeout = atoi(optarg);
                        break;
                case 'I':
+                       if (optarg == NULL)
+                               show_usage();
+                       if (xstrlen(optarg) > IF_NAMESIZE) {
+                               error_msg("Interface name `%s' must be less than %d", optarg,
+                                                 IF_NAMESIZE);
+                               exit(2);
+                       }
                        device = optarg;
                        break;
                case 'f':
@@ -322,10 +330,6 @@ int arping_main(int argc, char **argv)
 
        target = *argv;
 
-       if (device == NULL) {
-               error_msg("-I <interface> is required!");
-               exit(1);
-       }
 
        if (s < 0) {
                error_msg("socket");
@@ -338,7 +342,7 @@ int arping_main(int argc, char **argv)
                memset(&ifr, 0, sizeof(ifr));
                strncpy(ifr.ifr_name, device, IFNAMSIZ - 1);
                if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
-                       error_msg("unknown interface %s", device);
+                       error_msg("Interface %s not found", device);
                        exit(2);
                }
                ifindex = ifr.ifr_ifindex;
@@ -348,11 +352,11 @@ int arping_main(int argc, char **argv)
                        exit(2);
                }
                if (!(ifr.ifr_flags & IFF_UP)) {
-                       error_msg("Interface \"%s\" is down", device);
+                       error_msg("Interface %s is down", device);
                        exit(2);
                }
                if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) {
-                       error_msg("Interface \"%s\" is not ARPable", device);
+                       error_msg("Interface %s is not ARPable", device);
                        exit(dad ? 0 : 2);
                }
        }
@@ -388,7 +392,7 @@ int arping_main(int argc, char **argv)
                        if (setsockopt
                                (probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device,
                                 strlen(device) + 1) == -1)
-                               perror("WARNING: interface is ignored");
+                               error_msg("WARNING: interface %s is ignored", device);
                }
                memset(&saddr, 0, sizeof(saddr));
                saddr.sin_family = AF_INET;
@@ -458,6 +462,7 @@ int arping_main(int argc, char **argv)
 
        {
                struct sigaction sa;
+
                memset(&sa, 0, sizeof(sa));
                sa.sa_flags = SA_RESTART;