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141 lines
3.9 KiB
141 lines
3.9 KiB
/*
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* Copyright (c) 2010-2017 OTClient <https://github.com/edubart/otclient>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <framework/net/outputmessage.h>
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#include <framework/util/crypt.h>
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OutputMessage::OutputMessage()
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{
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reset();
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}
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void OutputMessage::reset()
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{
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m_writePos = MAX_HEADER_SIZE;
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m_headerPos = MAX_HEADER_SIZE;
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m_messageSize = 0;
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}
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void OutputMessage::setBuffer(const std::string& buffer)
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{
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int len = buffer.size();
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checkWrite(MAX_HEADER_SIZE + len);
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memcpy(m_buffer + MAX_HEADER_SIZE, buffer.c_str(), len);
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m_writePos = MAX_HEADER_SIZE;
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m_headerPos = MAX_HEADER_SIZE;
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m_messageSize = len;
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}
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void OutputMessage::addU8(uint8 value)
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{
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checkWrite(1);
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m_buffer[m_writePos] = value;
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m_writePos += 1;
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m_messageSize += 1;
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}
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void OutputMessage::addU16(uint16 value)
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{
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checkWrite(2);
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stdext::writeULE16(m_buffer + m_writePos, value);
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m_writePos += 2;
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m_messageSize += 2;
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}
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void OutputMessage::addU32(uint32 value)
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{
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checkWrite(4);
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stdext::writeULE32(m_buffer + m_writePos, value);
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m_writePos += 4;
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m_messageSize += 4;
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}
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void OutputMessage::addU64(uint64 value)
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{
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checkWrite(8);
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stdext::writeULE64(m_buffer + m_writePos, value);
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m_writePos += 8;
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m_messageSize += 8;
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}
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void OutputMessage::addString(const std::string& buffer)
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{
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int len = buffer.length();
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if(len > MAX_STRING_LENGTH)
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throw stdext::exception(stdext::format("string length > %d", MAX_STRING_LENGTH));
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checkWrite(len + 2);
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addU16(len);
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memcpy((char*)(m_buffer + m_writePos), buffer.c_str(), len);
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m_writePos += len;
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m_messageSize += len;
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}
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void OutputMessage::addPaddingBytes(int bytes, uint8 byte)
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{
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if(bytes <= 0)
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return;
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checkWrite(bytes);
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memset((void*)&m_buffer[m_writePos], byte, bytes);
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m_writePos += bytes;
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m_messageSize += bytes;
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}
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void OutputMessage::encryptRsa()
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{
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int size = g_crypt.rsaGetSize();
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if(m_messageSize < size)
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throw stdext::exception("insufficient bytes in buffer to encrypt");
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if(!g_crypt.rsaEncrypt((unsigned char*)m_buffer + m_writePos - size, size))
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throw stdext::exception("rsa encryption failed");
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}
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void OutputMessage::writeChecksum()
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{
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uint32 checksum = stdext::adler32(m_buffer + m_headerPos, m_messageSize);
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assert(m_headerPos - 4 >= 0);
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m_headerPos -= 4;
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stdext::writeULE32(m_buffer + m_headerPos, checksum);
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m_messageSize += 4;
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}
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void OutputMessage::writeMessageSize()
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{
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assert(m_headerPos - 2 >= 0);
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m_headerPos -= 2;
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stdext::writeULE16(m_buffer + m_headerPos, m_messageSize);
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m_messageSize += 2;
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}
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bool OutputMessage::canWrite(int bytes)
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{
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if(m_writePos + bytes > BUFFER_MAXSIZE)
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return false;
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return true;
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}
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void OutputMessage::checkWrite(int bytes)
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{
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if(!canWrite(bytes))
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throw stdext::exception("OutputMessage max buffer size reached");
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}
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