minetest/src/network/networkpacket.cpp
sfan5 c10952b574 Rework packet receiving in ServerThread
Notably it tries to receive all queued packets
between server steps, not just one.
2019-11-19 20:27:20 +01:00

539 lines
9.7 KiB
C++

/*
Minetest
Copyright (C) 2015 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "networkpacket.h"
#include <sstream>
#include "networkexceptions.h"
#include "util/serialize.h"
#include "networkprotocol.h"
NetworkPacket::NetworkPacket(u16 command, u32 datasize, session_t peer_id):
m_datasize(datasize), m_command(command), m_peer_id(peer_id)
{
m_data.resize(m_datasize);
}
NetworkPacket::NetworkPacket(u16 command, u32 datasize):
m_datasize(datasize), m_command(command)
{
m_data.resize(m_datasize);
}
NetworkPacket::~NetworkPacket()
{
m_data.clear();
}
void NetworkPacket::checkReadOffset(u32 from_offset, u32 field_size)
{
if (from_offset + field_size > m_datasize) {
std::stringstream ss;
ss << "Reading outside packet (offset: " <<
from_offset << ", packet size: " << getSize() << ")";
throw PacketError(ss.str());
}
}
void NetworkPacket::putRawPacket(u8 *data, u32 datasize, session_t peer_id)
{
// If a m_command is already set, we are rewriting on same packet
// This is not permitted
assert(m_command == 0);
m_datasize = datasize - 2;
m_peer_id = peer_id;
m_data.resize(m_datasize);
// split command and datas
m_command = readU16(&data[0]);
memcpy(m_data.data(), &data[2], m_datasize);
}
void NetworkPacket::clear()
{
m_data.clear();
m_datasize = 0;
m_read_offset = 0;
m_command = 0;
m_peer_id = 0;
}
const char* NetworkPacket::getString(u32 from_offset)
{
checkReadOffset(from_offset, 0);
return (char*)&m_data[from_offset];
}
void NetworkPacket::putRawString(const char* src, u32 len)
{
if (m_read_offset + len > m_datasize) {
m_datasize = m_read_offset + len;
m_data.resize(m_datasize);
}
if (len == 0)
return;
memcpy(&m_data[m_read_offset], src, len);
m_read_offset += len;
}
NetworkPacket& NetworkPacket::operator>>(std::string& dst)
{
checkReadOffset(m_read_offset, 2);
u16 strLen = readU16(&m_data[m_read_offset]);
m_read_offset += 2;
dst.clear();
if (strLen == 0) {
return *this;
}
checkReadOffset(m_read_offset, strLen);
dst.reserve(strLen);
dst.append((char*)&m_data[m_read_offset], strLen);
m_read_offset += strLen;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(const std::string &src)
{
if (src.size() > STRING_MAX_LEN) {
throw PacketError("String too long");
}
u16 msgsize = src.size();
*this << msgsize;
putRawString(src.c_str(), (u32)msgsize);
return *this;
}
void NetworkPacket::putLongString(const std::string &src)
{
if (src.size() > LONG_STRING_MAX_LEN) {
throw PacketError("String too long");
}
u32 msgsize = src.size();
*this << msgsize;
putRawString(src.c_str(), msgsize);
}
NetworkPacket& NetworkPacket::operator>>(std::wstring& dst)
{
checkReadOffset(m_read_offset, 2);
u16 strLen = readU16(&m_data[m_read_offset]);
m_read_offset += 2;
dst.clear();
if (strLen == 0) {
return *this;
}
checkReadOffset(m_read_offset, strLen * 2);
dst.reserve(strLen);
for(u16 i=0; i<strLen; i++) {
wchar_t c16 = readU16(&m_data[m_read_offset]);
dst.append(&c16, 1);
m_read_offset += sizeof(u16);
}
return *this;
}
NetworkPacket& NetworkPacket::operator<<(const std::wstring &src)
{
if (src.size() > WIDE_STRING_MAX_LEN) {
throw PacketError("String too long");
}
u16 msgsize = src.size();
*this << msgsize;
// Write string
for (u16 i=0; i<msgsize; i++) {
*this << (u16) src[i];
}
return *this;
}
std::string NetworkPacket::readLongString()
{
checkReadOffset(m_read_offset, 4);
u32 strLen = readU32(&m_data[m_read_offset]);
m_read_offset += 4;
if (strLen == 0) {
return "";
}
if (strLen > LONG_STRING_MAX_LEN) {
throw PacketError("String too long");
}
checkReadOffset(m_read_offset, strLen);
std::string dst;
dst.reserve(strLen);
dst.append((char*)&m_data[m_read_offset], strLen);
m_read_offset += strLen;
return dst;
}
NetworkPacket& NetworkPacket::operator>>(char& dst)
{
checkReadOffset(m_read_offset, 1);
dst = readU8(&m_data[m_read_offset]);
m_read_offset += 1;
return *this;
}
char NetworkPacket::getChar(u32 offset)
{
checkReadOffset(offset, 1);
return readU8(&m_data[offset]);
}
NetworkPacket& NetworkPacket::operator<<(char src)
{
checkDataSize(1);
writeU8(&m_data[m_read_offset], src);
m_read_offset += 1;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(u8 src)
{
checkDataSize(1);
writeU8(&m_data[m_read_offset], src);
m_read_offset += 1;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(bool src)
{
checkDataSize(1);
writeU8(&m_data[m_read_offset], src);
m_read_offset += 1;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(u16 src)
{
checkDataSize(2);
writeU16(&m_data[m_read_offset], src);
m_read_offset += 2;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(u32 src)
{
checkDataSize(4);
writeU32(&m_data[m_read_offset], src);
m_read_offset += 4;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(u64 src)
{
checkDataSize(8);
writeU64(&m_data[m_read_offset], src);
m_read_offset += 8;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(float src)
{
checkDataSize(4);
writeF32(&m_data[m_read_offset], src);
m_read_offset += 4;
return *this;
}
NetworkPacket& NetworkPacket::operator>>(bool& dst)
{
checkReadOffset(m_read_offset, 1);
dst = readU8(&m_data[m_read_offset]);
m_read_offset += 1;
return *this;
}
NetworkPacket& NetworkPacket::operator>>(u8& dst)
{
checkReadOffset(m_read_offset, 1);
dst = readU8(&m_data[m_read_offset]);
m_read_offset += 1;
return *this;
}
u8 NetworkPacket::getU8(u32 offset)
{
checkReadOffset(offset, 1);
return readU8(&m_data[offset]);
}
u8* NetworkPacket::getU8Ptr(u32 from_offset)
{
if (m_datasize == 0) {
return NULL;
}
checkReadOffset(from_offset, 1);
return (u8*)&m_data[from_offset];
}
NetworkPacket& NetworkPacket::operator>>(u16& dst)
{
checkReadOffset(m_read_offset, 2);
dst = readU16(&m_data[m_read_offset]);
m_read_offset += 2;
return *this;
}
u16 NetworkPacket::getU16(u32 from_offset)
{
checkReadOffset(from_offset, 2);
return readU16(&m_data[from_offset]);
}
NetworkPacket& NetworkPacket::operator>>(u32& dst)
{
checkReadOffset(m_read_offset, 4);
dst = readU32(&m_data[m_read_offset]);
m_read_offset += 4;
return *this;
}
NetworkPacket& NetworkPacket::operator>>(u64& dst)
{
checkReadOffset(m_read_offset, 8);
dst = readU64(&m_data[m_read_offset]);
m_read_offset += 8;
return *this;
}
NetworkPacket& NetworkPacket::operator>>(float& dst)
{
checkReadOffset(m_read_offset, 4);
dst = readF32(&m_data[m_read_offset]);
m_read_offset += 4;
return *this;
}
NetworkPacket& NetworkPacket::operator>>(v2f& dst)
{
checkReadOffset(m_read_offset, 8);
dst = readV2F32(&m_data[m_read_offset]);
m_read_offset += 8;
return *this;
}
NetworkPacket& NetworkPacket::operator>>(v3f& dst)
{
checkReadOffset(m_read_offset, 12);
dst = readV3F32(&m_data[m_read_offset]);
m_read_offset += 12;
return *this;
}
NetworkPacket& NetworkPacket::operator>>(s16& dst)
{
checkReadOffset(m_read_offset, 2);
dst = readS16(&m_data[m_read_offset]);
m_read_offset += 2;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(s16 src)
{
*this << (u16) src;
return *this;
}
NetworkPacket& NetworkPacket::operator>>(s32& dst)
{
checkReadOffset(m_read_offset, 4);
dst = readS32(&m_data[m_read_offset]);
m_read_offset += 4;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(s32 src)
{
*this << (u32) src;
return *this;
}
NetworkPacket& NetworkPacket::operator>>(v3s16& dst)
{
checkReadOffset(m_read_offset, 6);
dst = readV3S16(&m_data[m_read_offset]);
m_read_offset += 6;
return *this;
}
NetworkPacket& NetworkPacket::operator>>(v2s32& dst)
{
checkReadOffset(m_read_offset, 8);
dst = readV2S32(&m_data[m_read_offset]);
m_read_offset += 8;
return *this;
}
NetworkPacket& NetworkPacket::operator>>(v3s32& dst)
{
checkReadOffset(m_read_offset, 12);
dst = readV3S32(&m_data[m_read_offset]);
m_read_offset += 12;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(v2f src)
{
*this << (float) src.X;
*this << (float) src.Y;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(v3f src)
{
*this << (float) src.X;
*this << (float) src.Y;
*this << (float) src.Z;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(v3s16 src)
{
*this << (s16) src.X;
*this << (s16) src.Y;
*this << (s16) src.Z;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(v2s32 src)
{
*this << (s32) src.X;
*this << (s32) src.Y;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(v3s32 src)
{
*this << (s32) src.X;
*this << (s32) src.Y;
*this << (s32) src.Z;
return *this;
}
NetworkPacket& NetworkPacket::operator>>(video::SColor& dst)
{
checkReadOffset(m_read_offset, 4);
dst = readARGB8(&m_data[m_read_offset]);
m_read_offset += 4;
return *this;
}
NetworkPacket& NetworkPacket::operator<<(video::SColor src)
{
checkDataSize(4);
writeU32(&m_data[m_read_offset], src.color);
m_read_offset += 4;
return *this;
}
SharedBuffer<u8> NetworkPacket::oldForgePacket()
{
SharedBuffer<u8> sb(m_datasize + 2);
writeU16(&sb[0], m_command);
u8* datas = getU8Ptr(0);
if (datas != NULL)
memcpy(&sb[2], datas, m_datasize);
return sb;
}