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/**
* @file messages.cpp GNU ZRTP: Engine messages
*
* Copyright (C) 2010 - 2017 Alfred E. Heggestad
*/
#include <stdint.h>
#include <re.h>
#include <baresip.h>
#include <libzrtpcpp/ZRtp.h>
#include "stream.h"
using namespace GnuZrtpCodes;
#define NO_MESSAGE "NO MESSAGE DEFINED"
static const char *info_msg(int32_t subcode)
{
const char *msg;
switch (subcode) {
case InfoHelloReceived:
msg = "Hello received and prepared a Commit, "
"ready to get peer's hello hash";
break;
case InfoCommitDHGenerated:
msg = "Commit: Generated a public DH key";
break;
case InfoRespCommitReceived:
msg = "Responder: Commit received, preparing DHPart1";
break;
case InfoDH1DHGenerated:
msg = "DH1Part: Generated a public DH key";
break;
case InfoInitDH1Received:
msg = "Initiator: DHPart1 received, preparing DHPart2";
break;
case InfoRespDH2Received:
msg = "Responder: DHPart2 received, preparing Confirm1";
break;
case InfoInitConf1Received:
msg = "Initiator: Confirm1 received, preparing Confirm2";
break;
case InfoRespConf2Received:
msg = "Responder: Confirm2 received, preparing Conf2Ack";
break;
case InfoRSMatchFound:
msg = "At least one retained secret matches - security OK";
break;
case InfoSecureStateOn:
msg = "Entered secure state";
break;
case InfoSecureStateOff:
msg = "No more security for this session";
break;
default:
msg = NO_MESSAGE;
break;
}
return msg;
}
static const char *warning_msg(int32_t subcode)
{
const char *msg;
switch (subcode) {
case WarningDHAESmismatch:
msg = "Commit contains an AES256 cipher but does not offer a "
"Diffie-Helman 4096 - not used DH4096 was discarded";
break;
case WarningGoClearReceived:
msg = "Received a GoClear message";
break;
case WarningDHShort:
msg = "Hello offers an AES256 cipher but does not offer a "
"Diffie-Helman 4096- not used DH4096 was discarded";
break;
case WarningNoRSMatch:
msg = "No retained shared secrets available - must verify SAS";
break;
case WarningCRCmismatch:
msg = "Internal ZRTP packet checksum mismatch - "
"packet dropped";
break;
case WarningSRTPauthError:
msg = "Dropping packet because SRTP authentication failed!";
break;
case WarningSRTPreplayError:
msg = "Dropping packet because SRTP replay check failed!";
break;
case WarningNoExpectedRSMatch:
msg = "Valid retained shared secrets availabe but no matches "
"found - must verify SAS";
break;
case WarningNoExpectedAuxMatch:
msg = "Our AUX secret was set but the other peer's AUX secret "
"does not match ours";
break;
default:
msg = NO_MESSAGE;
break;
}
return msg;
}
static const char *severe_msg(int32_t subcode)
{
const char *msg;
switch (subcode) {
case SevereHelloHMACFailed:
msg = "Hash HMAC check of Hello failed!";
break;
case SevereCommitHMACFailed:
msg = "Hash HMAC check of Commit failed!";
break;
case SevereDH1HMACFailed:
msg = "Hash HMAC check of DHPart1 failed!";
break;
case SevereDH2HMACFailed:
msg = "Hash HMAC check of DHPart2 failed!";
break;
case SevereCannotSend:
msg = "Cannot send data - connection or peer down?";
break;
case SevereProtocolError:
msg = "Internal protocol error occured!";
break;
case SevereNoTimer:
msg = "Cannot start a timer - internal resources exhausted?";
break;
case SevereTooMuchRetries:
msg = "Too much retries during ZRTP negotiation - connection "
"or peer down?";
break;
default:
msg = NO_MESSAGE;
break;
}
return msg;
}
static const char *zrtp_msg(int32_t subcode)
{
const char *msg;
switch (subcode) {
case MalformedPacket:
msg = "Malformed packet (CRC OK, but wrong structure)";
break;
case CriticalSWError:
msg = "Critical software error";
break;
case UnsuppZRTPVersion:
msg = "Unsupported ZRTP version";
break;
case HelloCompMismatch:
msg = "Hello components mismatch";
break;
case UnsuppHashType:
msg = "Hash type not supported";
break;
case UnsuppCiphertype:
msg = "Cipher type not supported";
break;
case UnsuppPKExchange:
msg = "Public key exchange not supported";
break;
case UnsuppSRTPAuthTag:
msg = "SRTP auth. tag not supported";
break;
case UnsuppSASScheme:
msg = "SAS scheme not supported";
break;
case NoSharedSecret:
msg = "No shared secret available, DH mode required";
break;
case DHErrorWrongPV:
msg = "DH Error: bad pvi or pvr ( == 1, 0, or p-1)";
break;
case DHErrorWrongHVI:
msg = "DH Error: hvi != hashed data";
break;
case SASuntrustedMiTM:
msg = "Received relayed SAS from untrusted MiTM";
break;
case ConfirmHMACWrong:
msg = "Auth. Error: Bad Confirm pkt HMAC";
break;
case NonceReused:
msg = "Nonce reuse";
break;
case EqualZIDHello:
msg = "Equal ZIDs in Hello";
break;
case GoCleatNotAllowed:
msg = "GoClear packet received, but not allowed";
break;
default:
msg = NO_MESSAGE;
break;
}
return msg;
}
void Stream::print_message(GnuZrtpCodes::MessageSeverity severity,
int32_t subcode)
{
switch (severity) {
case Info:
debug("zrtp: INFO<%s>: %s\n",
media_name(), info_msg(subcode));
break;
case Warning:
warning("zrtp: WARNING<%s>: %s\n",
media_name(), warning_msg(subcode));
break;
case Severe:
warning("zrtp: SEVERE<%s>: %s\n",
media_name(), severe_msg(subcode));
break;
case ZrtpError:
warning("zrtp: ZRTP_ERR<%s>: %s\n",
media_name(), zrtp_msg(subcode));
break;
default:
return;
}
}
const char *Stream::media_name() const
{
switch (m_media_type) {
case MT_AUDIO: return "audio";
case MT_VIDEO: return "video";
case MT_TEXT: return "text";
case MT_APPLICATION: return "application";
case MT_MESSAGE: return "message";
default: return "UNKNOWN";
}
}
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