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Add Fake Packet maximum TTL limit to Auto TTL mode

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This patchset adds maximum TTL size of the fake packet to be sent,
to further  improve compatibility with asymmertic routing and
non-standard TTL value set on servers.
This commit is contained in:
ValdikSS
2021-12-29 02:05:39 +03:00
parent 8911e459d8
commit 46c4f36de8
4 changed files with 37 additions and 15 deletions
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src/ttltrack.c
+6 -1
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@@ -220,7 +220,8 @@ int tcp_handle_outgoing(uint32_t srcip[4], uint32_t dstip[4],
}
int tcp_get_auto_ttl(const uint8_t ttl, const uint8_t autottl1,
const uint8_t autottl2, const uint8_t minhops) {
const uint8_t autottl2, const uint8_t minhops,
const uint8_t maxttl) {
uint8_t nhops = 0;
uint8_t ttl_of_fake_packet = 0;
@@ -243,5 +244,9 @@ int tcp_get_auto_ttl(const uint8_t ttl, const uint8_t autottl1,
ttl_of_fake_packet = nhops - autottl1 - trunc((autottl2 - autottl1) * ((float)nhops/10));
}
if (maxttl && ttl_of_fake_packet > maxttl) {
ttl_of_fake_packet = maxttl;
}
return ttl_of_fake_packet;
}