diff options
Diffstat (limited to 'usr.sbin/arp/arp.c')
| -rw-r--r-- | usr.sbin/arp/arp.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/usr.sbin/arp/arp.c b/usr.sbin/arp/arp.c index 4154c3a1..ab3587c 100644 --- a/usr.sbin/arp/arp.c +++ b/usr.sbin/arp/arp.c @@ -330,8 +330,14 @@ set(int argc, char **argv) argc--; argv++; } } else if (strncmp(argv[0], "blackhole", 9) == 0) { + if (flags & RTF_REJECT) { + printf("Choose one of blackhole or reject, not both.\n"); + } flags |= RTF_BLACKHOLE; } else if (strncmp(argv[0], "reject", 6) == 0) { + if (flags & RTF_BLACKHOLE) { + printf("Choose one of blackhole or reject, not both.\n"); + } flags |= RTF_REJECT; } else if (strncmp(argv[0], "trail", 5) == 0) { /* XXX deprecated and undocumented feature */ @@ -648,8 +654,8 @@ usage(void) " arp [-n] [-i interface] -a", " arp -d hostname [pub]", " arp -d [-i interface] -a", - " arp -s hostname ether_addr [temp] [reject] [blackhole] [pub [only]]", - " arp -S hostname ether_addr [temp] [reject] [blackhole] [pub [only]]", + " arp -s hostname ether_addr [temp] [reject | blackhole] [pub [only]]", + " arp -S hostname ether_addr [temp] [reject | blackhole] [pub [only]]", " arp -f filename"); exit(1); } |
