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added camouflaging functionality and instrumentation

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This commit is contained in:
eerieaerial 2025-04-30 17:40:54 +04:00
parent cdaf5e5468
commit 083b833bf8
16 changed files with 904 additions and 43 deletions
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22
node/Packet.hpp
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@ -232,6 +232,8 @@
/**
* Packet buffer size (can be changed)
*/
#define ZT_PROTO_ADDITIONAL_CAMO_LENGTH 4
#define ZT_PROTO_MAX_PACKET_LENGTH (ZT_MAX_PACKET_FRAGMENTS * ZT_DEFAULT_PHYSMTU)
/**
@ -388,7 +390,7 @@ namespace ZeroTier {
* For unencrypted packets, MAC is computed on plaintext. Only HELLO is ever
* sent in the clear, as it's the "here is my public key" message.
*/
class Packet : public Buffer<ZT_PROTO_MAX_PACKET_LENGTH>
class Packet : public Buffer<ZT_PROTO_MAX_PACKET_LENGTH + ZT_PROTO_ADDITIONAL_CAMO_LENGTH>
{
public:
/**
@ -417,22 +419,22 @@ public:
* receipt to authenticate and decrypt; there is no per-fragment MAC. (But if
* fragments are corrupt, the MAC will fail for the whole assembled packet.)
*/
class Fragment : public Buffer<ZT_PROTO_MAX_PACKET_LENGTH>
class Fragment : public Buffer<ZT_PROTO_MAX_PACKET_LENGTH + ZT_PROTO_ADDITIONAL_CAMO_LENGTH>
{
public:
Fragment() :
Buffer<ZT_PROTO_MAX_PACKET_LENGTH>()
Buffer<ZT_PROTO_MAX_PACKET_LENGTH + ZT_PROTO_ADDITIONAL_CAMO_LENGTH>()
{
}
template<unsigned int C2>
Fragment(const Buffer<C2> &b) :
Buffer<ZT_PROTO_MAX_PACKET_LENGTH>(b)
Buffer<ZT_PROTO_MAX_PACKET_LENGTH + ZT_PROTO_ADDITIONAL_CAMO_LENGTH>(b)
{
}
Fragment(const void *data,unsigned int len) :
Buffer<ZT_PROTO_MAX_PACKET_LENGTH>(data,len)
Buffer<ZT_PROTO_MAX_PACKET_LENGTH + ZT_PROTO_ADDITIONAL_CAMO_LENGTH>(data,len)
{
}
@ -1091,12 +1093,12 @@ public:
template<unsigned int C2>
Packet(const Buffer<C2> &b) :
Buffer<ZT_PROTO_MAX_PACKET_LENGTH>(b)
Buffer<ZT_PROTO_MAX_PACKET_LENGTH + ZT_PROTO_ADDITIONAL_CAMO_LENGTH>(b)
{
}
Packet(const void *data,unsigned int len) :
Buffer<ZT_PROTO_MAX_PACKET_LENGTH>(data,len)
Buffer<ZT_PROTO_MAX_PACKET_LENGTH + ZT_PROTO_ADDITIONAL_CAMO_LENGTH>(data,len)
{
}
@ -1108,7 +1110,7 @@ public:
* the header. Payload should be appended; initial size is header size.
*/
Packet() :
Buffer<ZT_PROTO_MAX_PACKET_LENGTH>(ZT_PROTO_MIN_PACKET_LENGTH)
Buffer<ZT_PROTO_MAX_PACKET_LENGTH + ZT_PROTO_ADDITIONAL_CAMO_LENGTH>(ZT_PROTO_MIN_PACKET_LENGTH)
{
Utils::getSecureRandom(field(ZT_PACKET_IDX_IV,8),8);
(*this)[ZT_PACKET_IDX_FLAGS] = 0; // zero flags, cipher ID, and hops
@ -1124,7 +1126,7 @@ public:
* @param dest Destination ZeroTier address for new packet
*/
Packet(const Packet &prototype,const Address &dest) :
Buffer<ZT_PROTO_MAX_PACKET_LENGTH>(prototype)
Buffer<ZT_PROTO_MAX_PACKET_LENGTH + ZT_PROTO_ADDITIONAL_CAMO_LENGTH>(prototype)
{
Utils::getSecureRandom(field(ZT_PACKET_IDX_IV,8),8);
setDestination(dest);
@ -1138,7 +1140,7 @@ public:
* @param v Verb
*/
Packet(const Address &dest,const Address &source,const Verb v) :
Buffer<ZT_PROTO_MAX_PACKET_LENGTH>(ZT_PROTO_MIN_PACKET_LENGTH)
Buffer<ZT_PROTO_MAX_PACKET_LENGTH + ZT_PROTO_ADDITIONAL_CAMO_LENGTH>(ZT_PROTO_MIN_PACKET_LENGTH)
{
Utils::getSecureRandom(field(ZT_PACKET_IDX_IV,8),8);
setDestination(dest);