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Code Issues Releases Wiki Activity

IP packets sent using PacketSender::send_recv now match ICMP responses.

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This commit is contained in:
Matias Fontanini
2013-12-14 12:48:56 -03:00
parent 9b57585b62
commit 0acb0fee3e
2 changed files with 47 additions and 0 deletions
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14
src/ip.cpp
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@@ -432,6 +432,20 @@ bool IP::matches_response(const uint8_t *ptr, uint32_t total_sz) const {
if(total_sz < sizeof(iphdr))
return false;
const iphdr *ip_ptr = (const iphdr*)ptr;
// dest unreachable?
if(ip_ptr->protocol == Constants::IP::PROTO_ICMP) {
const uint8_t *pkt_ptr = ptr + sizeof(iphdr);
uint32_t pkt_sz = total_sz - sizeof(iphdr);
// It's an ICMP dest unreachable
if(pkt_sz > 4 && pkt_ptr[0] == 3) {
pkt_ptr += 4;
pkt_sz -= 4;
// If our IP header is in the ICMP payload, then it's the same packet.
// This keeps in mind checksum and IP identifier, so I guess it's enough.
if(pkt_sz >= sizeof(iphdr) && std::memcmp(&_ip, pkt_ptr, sizeof(iphdr)))
return true;
}
}
// checks for broadcast addr
if((_ip.saddr == ip_ptr->daddr && (_ip.daddr == ip_ptr->saddr || dst_addr().is_broadcast())) ||
(dst_addr().is_broadcast() && _ip.saddr == 0)) {