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/*
** Command & Conquer Generals Zero Hour(tm)
** Copyright 2025 Electronic Arts Inc.
**
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 3 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <iostream.h>
#include <signal.h>
#ifdef _WINDOWS
#include <process.h> // *MUST* be included before ANY Wnet/Wlib headers if _REENTRANT is defined
#endif
#include "mangler.h"
#include "crc.h"
#include "endian.h"
#include <configfile.h>
#include "threadfac.h"
#include "xtime.h"
#include <filed.h>
#include <wstring.h>
#include <wdebug.h>
#include <udp.h>
void DisplayHelp(const char *prog)
{
cout << "Usage: " << prog << " <config file>" << endl;
exit(0);
}
int main(int argc, char **argv)
{
ConfigFile config;
FILE* conf;
if( argc <= 1 )
{
// No args - use a default config file
if ((conf = fopen("mangler.cfg", "r")) == NULL) {
cout << "Cannot open mangler.cfg for reading." << endl;
DisplayHelp(argv[0]);
}
config.readFile(conf);
fclose(conf);
}
else if( argc == 2 && (strcmp(argv[1], "help") == 0 || strcmp(argv[1], "?") == 0 ||
strcmp(argv[1], "-h") == 0) )
DisplayHelp(argv[0]);
else if( argc == 2 )
{
// Use a user-supplied config file
if ((conf = fopen(argv[1], "r")) == NULL) {
cout << "Cannot open " << argv[1] << " for reading." << endl;
DisplayHelp(argv[0]);
}
config.readFile(conf);
fclose(conf);
}
// ----- LOGGING -----
// Setup debugging & logging output
Wstring output_file("mangler.log");
config.getString("LOGFILE", output_file);
Wstring backup_file;
backup_file = output_file;
backup_file += ".bak";
rename(output_file.get(),backup_file.get()); // save the old file
FileD output_device(output_file.get());
MsgManager::setAllStreams(&output_device);
DBGMSG("DBG working...");
INFMSG("INF working...");
WRNMSG("WRN working...");
if (htonl(0x12345678) == 0x12345678)
{
INFMSG("Host is network-byte-order");
}
else
{
INFMSG("Host is Intel-byte-order");
}
// ----- Initialize Winsock -----
#ifdef _WINDOWS
WORD verReq = MAKEWORD(2, 2);
WSADATA wsadata;
int err = WSAStartup(verReq, &wsadata);
if (err != 0) {
ERRMSG("Winsock Init failed.");
return 1;
}
if ((LOBYTE(wsadata.wVersion) != 2) || (HIBYTE(wsadata.wVersion) !=2)) {
ERRMSG("Winsock DLL is not 2.2");
WSACleanup();
ERRMSG("Winsock Init failed.");
return 1;
}
INFMSG("Winsock Init done.");
#endif
// Set up a UDP listener
uint8 *buff=new uint8[1024];
int retval;
UDP udp;
UDP udp2;
UDP udp3;
UDP udp4;
int port = 4321;
config.getInt("PORT", port);
uint8 blitz = 0;
uint32 localIP = 0;
Wstring hostIPStr = "";
config.getString("IP", hostIPStr);
if (hostIPStr.length())
{
INFMSG("Binding to "<<hostIPStr.get()<<":"<<port<<"-"<<(port+3));
localIP = ntohl(inet_addr(hostIPStr.get()));
}
else
{
INFMSG("Binding to localhost:"<<port<<"-"<<(port+3));
}
retval = udp.Bind(localIP,(uint16)port);
retval |= udp2.Bind(localIP,(uint16)port+1);
retval |= udp3.Bind(localIP,(uint16)port+2);
retval |= udp4.Bind(localIP,(uint16)port+3);
if (retval != 0)
{
ERRMSG("Couldn't bind - error " << retval);
exit(1);
}
unsigned char buf[1024];
struct sockaddr_in addr;
int packet_size = sizeof(ManglerData);
INFMSG("sizeof(packet) == " << packet_size);
unsigned char *theAddr;
fd_set fdset;
while (1)
{
retval = udp.Wait(15, 0, fdset);
if (!retval)
continue;
//DBGMSG("Wait returned " << retval);
retval = udp.Read(buf, packet_size, &addr); // Wait until there is something on the socket
if (retval > 0)
{
ManglerData *packet = (ManglerData *)buf;
theAddr = (unsigned char *)&(addr.sin_addr.s_addr);
if (retval != packet_size)
{
WRNMSG("Recieved mis-sized packet (" << retval << " bytes) from " << theAddr[0] << "." << theAddr[1] << "." << theAddr[2] << "." << theAddr[3] << ":" << addr.sin_port);
}
else
{
if (!Passes_CRC_Check(buf, packet_size))
{
WRNMSG("Recieved a bad packet - good length!");
continue;
}
packet->NetCommandType = 44;
packet->MyMangledPortNumber = addr.sin_port; // not changing to host order, cause its in network byte order now, and the game will expect it to stay that way.
packet->MyMangledAddress[0] = theAddr[0];
packet->MyMangledAddress[1] = theAddr[1];
packet->MyMangledAddress[2] = theAddr[2];
packet->MyMangledAddress[3] = theAddr[3];
blitz = packet->BlitzMe;
INFMSG("Packet ID = " << packet->packetID);
Build_Packet_CRC(buf, packet_size);
udp.Write(buf,packet_size,ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
INFMSG("Saw " << (int)theAddr[0] << "." << (int)theAddr[1] << "." << (int)theAddr[2] << "." << (int)theAddr[3] << ":" << ntohs(addr.sin_port) << ((blitz)?" Blitzed":"") );
if (blitz)
{
udp2.Write(buf,packet_size,ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port)+1);
udp3.Write(buf,packet_size,ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port)+2);
udp4.Write(buf,packet_size,ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port)+3);
}
}
}
}
return 0;
}