/*
* Reads a string
* Its important that the maxStringLength parameter has the same value as the maxStringLength parameter of xptPacketbuffer_writeData() that was used to write the string
*/
void xptPacketbuffer_readString(xptPacketbuffer_t* pb, char* stringData, uint32_t maxStringLength, bool* error) {
if (maxStringLength == 0 || maxStringLength > 0xFFFF) {
fprintf(stderr, "xptPacketbuffer_readString(): Invalid maxStringLength\n");
// strings of max length 0 or longer than 2^16-1 are not supported
*error = true;
return;
}
maxStringLength--; // -1 since we count in the '\0' at the end
// get size of the string + length prefix
uint32_t stringLength = 0;
if (maxStringLength <= 0xFF) {
stringLength = (uint32_t)xptPacketbuffer_readU8(pb, error);
if (*error) return;
} else {
stringLength = (uint32_t)xptPacketbuffer_readU16(pb, error);
if (*error) return;
}
// string length valid?
if (stringLength >= maxStringLength) {
fprintf(stderr, "xptPacketbuffer_readString(): Stringlength invalid\n");
*error = true;return;
}
// packet data large enough?
if ((pb->parserIndex+stringLength) > pb->bufferSize) {
fprintf(stderr, "xptPacketbuffer_readString(): End of data in string\n");
*error = true;return;
}
// write string data
memcpy(stringData, (pb->buffer+pb->parserIndex), stringLength);
stringData[stringLength] = '\0';
pb->parserIndex += stringLength;
*error = false;
}
/*
* Called when a packet with the opcode XPT_OPC_S_MESSAGE is received
*/
bool xptClient_processPacket_message(xptClient_t* xptClient)
{
xptPacketbuffer_t* cpb = xptClient->recvBuffer;
// read data from the packet
xptPacketbuffer_beginReadPacket(cpb);
// start parsing
bool readError = false;
// read type field (not used yet)
uint32 messageType = xptPacketbuffer_readU8(cpb, &readError);
if( readError )
return false;
// read message text (up to 1024 bytes)
char messageText[1024];
xptPacketbuffer_readString(cpb, messageText, 1024, &readError);
messageText[1023] = '\0';
if( readError )
return false;
printf("Server message: %s\n", messageText);
return true;
}
/*
* Called when a packet with the opcode XPT_OPC_S_AUTH_ACK is received
*/
bool xptClient_processPacket_authResponse(xptClient_t* xptClient)
{
xptPacketbuffer_t* cpb = xptClient->recvBuffer;
// read data from the packet
xptPacketbuffer_beginReadPacket(cpb);
// start parsing
bool readError = false;
// read error code field
uint32 authErrorCode = xptPacketbuffer_readU32(cpb, &readError);
if( readError )
return false;
// read reject reason / motd
char rejectReason[512];
xptPacketbuffer_readString(cpb, rejectReason, 512, &readError);
rejectReason[511] = '\0';
if( readError )
return false;
if( authErrorCode == 0 )
{
xptClient->clientState = XPT_CLIENT_STATE_LOGGED_IN;
printf("xpt: Logged in with %s\n", xptClient->username);
if( rejectReason[0] != '\0' )
printf("Message from server: %s\n", rejectReason);
// start ping mechanism
xptClient->time_sendPing = (uint32)time(NULL) + 60; // first ping after one minute
}
else
{
// error logging in -> disconnect
printf("xpt: Failed to log in with %s\n", xptClient->username);
if( rejectReason[0] != '\0' )
printf("Reason: %s\n", rejectReason);
return false;
}
// get algorithm used by this worker
xptClient->algorithm = xptPacketbuffer_readU8(cpb, &readError);
return true;
}
