On Fri, Jan 05, 2001 at 07:21:36PM +0100, antirez wrote:
> When tcpdump receives UDP packets with the udp-len field < 8
When tcpdump receives a UDP packet with a udp-len field < 8 it should
find the host that sent it and send that host a packet to cause it to
melt down into a heap of slag, because RFC 768, "User Datagram
Protocol", says:
Length is the length in octets of this user datagram including this
header and the data. (This means the minimum value of the length is
eight.)
Unfortunately, as there's no IP "melt this host into a heap of slag,
because it's broken" packet, the best we can do is report an error in
the packet, as per your second suggestion:
> if (ulen >= 8) {
> (void)printf(" udp %u",
> (u_int32_t)(ulen - sizeof(*up)));
> } else {
> (void)printf(" udp (<8 %u)", (u_int32_t) ulen);
> }
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