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Functionality to encode/decode retry tokens

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Summary: This diff defines functionality to encode and decode un-encrypted retry tokens.

Reviewed By: mjoras

Differential Revision: D21073343

fbshipit-source-id: 79c2e8ba3c743441edd4b162da69cc5e69873dd2
This commit is contained in:
Aman Sharma
2020-04-21 22:34:15 -07:00
committed by Facebook GitHub Bot
parent 04c6d70a3b
commit 84c1ed50f0
5 changed files with 72 additions and 0 deletions
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40
quic/codec/Decode.cpp
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@@ -649,6 +649,46 @@ HandshakeDoneFrame decodeHandshakeDoneFrame(folly::io::Cursor& /*cursor*/) {
return HandshakeDoneFrame();
}
folly::Expected<RetryToken, TransportErrorCode> parsePlaintextRetryToken(
folly::io::Cursor& cursor) {
// Read in the length of the odcid.
if (!cursor.canAdvance(sizeof(uint8_t))) {
return folly::makeUnexpected(TransportErrorCode::INVALID_TOKEN);
}
auto odcidLen = cursor.readBE<uint8_t>();
// Read in the odcid.
if (!cursor.canAdvance(odcidLen)) {
return folly::makeUnexpected(TransportErrorCode::INVALID_TOKEN);
}
ConnectionId connId(cursor, odcidLen);
// Read in the port.
if (!cursor.canAdvance(sizeof(uint16_t))) {
return folly::makeUnexpected(TransportErrorCode::INVALID_TOKEN);
}
auto clientPort = cursor.readBE<uint16_t>();
// Read in the length of the client ip address.
if (!cursor.canAdvance(sizeof(uint8_t))) {
return folly::makeUnexpected(TransportErrorCode::INVALID_TOKEN);
}
uint16_t ipAddrLen = cursor.readBE<uint8_t>();
if (!cursor.canAdvance(ipAddrLen)) {
return folly::makeUnexpected(TransportErrorCode::INVALID_TOKEN);
}
// Read in the ip address.
std::string ipAddressStr = cursor.readFixedString(ipAddrLen);
auto ipAddress = folly::IPAddress::tryFromString(ipAddressStr);
if (!ipAddress.hasValue()) {
return folly::makeUnexpected(TransportErrorCode::INVALID_TOKEN);
}
return RetryToken(connId, *ipAddress, clientPort);
}
QuicFrame parseFrame(
BufQueue& queue,
const PacketHeader& header,