diff options
| -rw-r--r-- | src/valid_address.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/src/valid_address.c b/src/valid_address.c index 2f93c257..1053693e 100644 --- a/src/valid_address.c +++ b/src/valid_address.c @@ -62,20 +62,23 @@ static int valid_ipv4(const char *str) return 0; } - if (~addr == 0) { - fprintf(stderr, - "Can not assign broadcast address as IP address\n"); - return 0; - } - if (plen < 31) { uint32_t net_mask = ~0 << (32 - plen); + uint32_t broadcast = (addr & net_mask) | (~0 &~ net_mask); + if ((addr & net_mask) == addr) { fprintf(stderr, "Can not assign network address as IP address\n"); return 0; } + + if (addr == broadcast) { + fprintf(stderr, + "Can not assign broadcast address as IP address\n"); + return 0; + } } + return 1; bad_addr: |