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@ -324,6 +324,18 @@ namespace transport
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{
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{
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uint8_t buf[320 + 18]; // 304 bytes for ipv4, 320 for ipv6
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uint8_t buf[320 + 18]; // 304 bytes for ipv4, 320 for ipv6
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uint8_t * payload = buf + sizeof (SSUHeader);
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uint8_t * payload = buf + sizeof (SSUHeader);
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uint8_t flag = 0;
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// fill extended options, 3 bytes extended options don't change message size
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if (i2p::context.GetStatus () == eRouterStatusOK) // we don't need relays
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{
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// tell out peer to now assign relay tag
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flag = SSU_HEADER_EXTENDED_OPTIONS_INCLUDED;
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*payload = 2; payload++; // 1 byte length
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uint16_t flags = 0; // clear EXTENDED_OPTIONS_FLAG_REQUEST_RELAY_TAG
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htobe16buf (payload, flags);
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payload += 2;
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}
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// fill payload
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memcpy (payload, m_DHKeysPair->GetPublicKey (), 256); // x
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memcpy (payload, m_DHKeysPair->GetPublicKey (), 256); // x
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bool isV4 = m_RemoteEndpoint.address ().is_v4 ();
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bool isV4 = m_RemoteEndpoint.address ().is_v4 ();
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if (isV4)
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if (isV4)
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@ -336,10 +348,10 @@ namespace transport
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payload[256] = 16;
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payload[256] = 16;
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memcpy (payload + 257, m_RemoteEndpoint.address ().to_v6 ().to_bytes ().data(), 16);
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memcpy (payload + 257, m_RemoteEndpoint.address ().to_v6 ().to_bytes ().data(), 16);
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}
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}
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// encrypt and send
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uint8_t iv[16];
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uint8_t iv[16];
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RAND_bytes (iv, 16); // random iv
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RAND_bytes (iv, 16); // random iv
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FillHeaderAndEncrypt (PAYLOAD_TYPE_SESSION_REQUEST, buf, isV4 ? 304 : 320, m_IntroKey, iv, m_IntroKey);
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FillHeaderAndEncrypt (PAYLOAD_TYPE_SESSION_REQUEST, buf, isV4 ? 304 : 320, m_IntroKey, iv, m_IntroKey, flag);
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m_Server.Send (buf, isV4 ? 304 : 320, m_RemoteEndpoint);
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m_Server.Send (buf, isV4 ? 304 : 320, m_RemoteEndpoint);
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}
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}
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@ -666,7 +678,7 @@ namespace transport
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}
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}
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void SSUSession::FillHeaderAndEncrypt (uint8_t payloadType, uint8_t * buf, size_t len,
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void SSUSession::FillHeaderAndEncrypt (uint8_t payloadType, uint8_t * buf, size_t len,
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const i2p::crypto::AESKey& aesKey, const uint8_t * iv, const i2p::crypto::MACKey& macKey)
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const i2p::crypto::AESKey& aesKey, const uint8_t * iv, const i2p::crypto::MACKey& macKey, uint8_t flag)
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{
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{
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if (len < sizeof (SSUHeader))
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if (len < sizeof (SSUHeader))
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{
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{
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@ -675,7 +687,7 @@ namespace transport
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}
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}
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SSUHeader * header = (SSUHeader *)buf;
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SSUHeader * header = (SSUHeader *)buf;
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memcpy (header->iv, iv, 16);
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memcpy (header->iv, iv, 16);
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header->flag = payloadType << 4; // MSB is 0
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header->flag = flag | (payloadType << 4); // MSB is 0
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htobe32buf (header->time, i2p::util::GetSecondsSinceEpoch ());
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htobe32buf (header->time, i2p::util::GetSecondsSinceEpoch ());
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uint8_t * encrypted = &header->flag;
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uint8_t * encrypted = &header->flag;
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uint16_t encryptedLen = len - (encrypted - buf);
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uint16_t encryptedLen = len - (encrypted - buf);
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