forked from alterware/iw6-mod
297 lines
7.9 KiB
C++
297 lines
7.9 KiB
C++
#include <std_include.hpp>
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#include "loader/component_loader.hpp"
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#include "game/game.hpp"
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#include "command.hpp"
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#include "network.hpp"
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#include <utils/hook.hpp>
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#include <utils/string.hpp>
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namespace network
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{
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namespace
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{
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std::unordered_map<std::string, callback>& get_callbacks()
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{
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static std::unordered_map<std::string, callback> callbacks{};
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return callbacks;
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}
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bool handle_command(game::netadr_s* address, const char* command, game::msg_t* message)
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{
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const auto cmd_string = utils::string::to_lower(command);
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auto& callbacks = get_callbacks();
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const auto handler = callbacks.find(cmd_string);
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const auto offset = cmd_string.size() + 5;
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if (message->cursize < offset || handler == callbacks.end())
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{
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return false;
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}
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const std::string data(message->data + offset, message->cursize - offset);
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handler->second(*address, data);
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return true;
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}
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void handle_command_stub(utils::hook::assembler& a)
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{
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const auto return_unhandled = a.newLabel();
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a.pushad64();
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a.mov(r8, rsi); // message
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a.mov(rdx, rdi); // command
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a.mov(rcx, r14); // netaddr
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a.call_aligned(handle_command);
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a.test(al, al);
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a.jz(return_unhandled);
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// Command handled
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a.popad64();
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a.jmp(0x1402C6DE8);
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a.bind(return_unhandled);
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a.popad64();
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a.jmp(0x1402C64EE);
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}
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int net_compare_base_address(const game::netadr_s* a1, const game::netadr_s* a2)
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{
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if (a1->type == a2->type)
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{
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switch (a1->type)
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{
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case game::netadrtype_t::NA_BOT:
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case game::netadrtype_t::NA_LOOPBACK:
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return a1->port == a2->port;
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case game::netadrtype_t::NA_IP:
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return !memcmp(a1->ip, a2->ip, 4);
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case game::netadrtype_t::NA_BROADCAST:
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return true;
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default:
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break;
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}
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}
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return false;
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}
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int net_compare_address(const game::netadr_s* a1, const game::netadr_s* a2)
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{
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return net_compare_base_address(a1, a2) && a1->port == a2->port;
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}
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void reconnect_migratated_client(game::mp::client_t*, game::netadr_s* from, const int, const int, const char*,
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const char*, bool)
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{
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// This happens when a client tries to rejoin after being recently disconnected, OR by a duplicated guid
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// We don't want this to do anything. It decides to crash seemingly randomly
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// Rather than try and let the player in, just tell them they are a duplicate player and reject connection
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game::NET_OutOfBandPrint(game::NS_SERVER, from, "error\nYou are already connected to the server.");
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}
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void* memmove_stub(void* dest, const void* src, std::size_t count)
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{
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return std::memmove(dest, src, std::min<std::size_t>(count, 1262));
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}
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}
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void on(const std::string& command, const callback& callback)
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{
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get_callbacks()[utils::string::to_lower(command)] = callback;
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}
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int dw_send_to_stub(const int size, const char* src, game::netadr_s* addr)
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{
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sockaddr s = {};
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game::NetadrToSockadr(addr, &s);
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return sendto(*game::query_socket, src, size, 0, &s, 16) >= 0;
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}
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void send(const game::netadr_s& address, const std::string& command, const std::string& data, const char separator)
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{
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std::string packet = "\xFF\xFF\xFF\xFF";
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packet.append(command);
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packet.push_back(separator);
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packet.append(data);
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send_data(address, packet);
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}
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void send_data(const game::netadr_s& address, const std::string& data)
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{
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if (address.type == game::NA_LOOPBACK)
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{
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game::NET_SendLoopPacket(game::NS_CLIENT1, static_cast<int>(data.size()), data.data(), &address);
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}
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else
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{
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game::Sys_SendPacket(static_cast<int>(data.size()), data.data(), &address);
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}
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}
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bool are_addresses_equal(const game::netadr_s& a, const game::netadr_s& b)
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{
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return net_compare_address(&a, &b);
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}
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const char* net_adr_to_string(const game::netadr_s& a)
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{
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if (a.type == game::netadrtype_t::NA_LOOPBACK)
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{
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return "loopback";
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}
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if (a.type == game::netadrtype_t::NA_BOT)
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{
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return "bot";
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}
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if (a.type == game::netadrtype_t::NA_IP || a.type == game::netadrtype_t::NA_BROADCAST)
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{
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if (a.port)
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{
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return utils::string::va("%u.%u.%u.%u:%u", a.ip[0], a.ip[1], a.ip[2], a.ip[3], htons(a.port));
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}
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return utils::string::va("%u.%u.%u.%u", a.ip[0], a.ip[1], a.ip[2], a.ip[3]);
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}
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return "bad";
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}
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void set_xuid_config_string_stub(utils::hook::assembler& a)
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{
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const auto return_regular = a.newLabel();
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a.mov(rax, ptr(rsp));
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a.mov(r9, 0x140477715); // This is the evil one :(
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a.cmp(rax, r9);
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a.jne(return_regular);
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// Do the original work
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a.call_aligned(return_regular);
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// Jump to success branch
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a.mov(rax, 0x14047771E);
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a.mov(ptr(rsp), rax);
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a.ret();
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a.bind(return_regular);
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a.sub(rsp, 0x38);
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a.mov(eax, ptr(rcx));
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a.mov(r9d, ptr(rcx, 4));
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a.mov(r10, rdx);
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a.jmp(0x14041DFBD);
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}
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game::dvar_t* register_netport_stub(const char* dvarName, int value, int min, int max, unsigned int flags,
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const char* description)
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{
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auto dvar = game::Dvar_RegisterInt("net_port", 27016, 0, 0xFFFFu, game::DVAR_FLAG_LATCHED, "Network port");
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// read net_port from command line
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command::read_startup_variable("net_port");
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return dvar;
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}
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class component final : public component_interface
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{
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public:
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void post_unpack() override
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{
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{
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if (game::environment::is_sp())
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{
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return;
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}
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// redirect dw_sendto to raw socket
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utils::hook::jump(0x140501A00, dw_send_to_stub);
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// intercept command handling
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utils::hook::jump(0x1402C64CB, utils::hook::assemble(handle_command_stub), true);
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// handle xuid without secure connection
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utils::hook::jump(0x14041DFB0, utils::hook::assemble(set_xuid_config_string_stub), true);
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utils::hook::jump(0x14041D010, net_compare_address);
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utils::hook::jump(0x14041D060, net_compare_base_address);
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// don't establish secure conenction
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utils::hook::set<uint8_t>(0x1402ECF1D, 0xEB);
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utils::hook::set<uint8_t>(0x1402ED02A, 0xEB);
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utils::hook::set<uint8_t>(0x1402ED34D, 0xEB);
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utils::hook::set<uint8_t>(0x1402C4A1F, 0xEB); //
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// ignore unregistered connection
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utils::hook::jump(0x140471AAC, reinterpret_cast<void*>(0x140471A50));
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utils::hook::set<uint8_t>(0x140471AF0, 0xEB);
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// disable xuid verification
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utils::hook::set<uint8_t>(0x140154AA9, 0xEB);
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utils::hook::set<uint8_t>(0x140154AC3, 0xEB);
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// disable xuid verification
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utils::hook::nop(0x140474584, 2);
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utils::hook::set<uint8_t>(0x1404745DB, 0xEB);
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// ignore configstring mismatch
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utils::hook::set<uint8_t>(0x1402CCCC7, 0xEB);
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// ignore dw handle in SV_PacketEvent
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utils::hook::set<uint8_t>(0x14047A17A, 0xEB);
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utils::hook::call(0x14047A16E, &net_compare_address);
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// ignore dw handle in SV_FindClientByAddress
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utils::hook::set<uint8_t>(0x1404799AD, 0xEB);
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utils::hook::call(0x1404799A1, &net_compare_address);
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// ignore dw handle in SV_DirectConnect
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utils::hook::set<uint8_t>(0x1404717BA, 0xEB);
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utils::hook::set<uint8_t>(0x1404719DF, 0xEB);
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utils::hook::call(0x1404717AD, &net_compare_address);
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utils::hook::call(0x1404719D2, &net_compare_address);
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// increase cl_maxpackets
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utils::hook::set<uint8_t>(0x1402C8083, 125);
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utils::hook::set<uint8_t>(0x1402C808C, 125);
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// ignore impure client
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utils::hook::jump(0x140472671, reinterpret_cast<void*>(0x1404726F9));
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// don't send checksum
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utils::hook::set<uint8_t>(0x140501A63, 0);
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// don't read checksum
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utils::hook::jump(0x1405019CB, 0x1405019F3);
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// don't try to reconnect client
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utils::hook::call(0x14047197E, reconnect_migratated_client);
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// allow server owner to modify net_port before the socket bind
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utils::hook::call(0x140500FD0, register_netport_stub);
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// ignore built in "print" oob command for security reasons
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utils::hook::set<std::uint8_t>(0x1402C6AA4, 0xEB);
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// patch buffer overflow
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utils::hook::call(0x14041D17E, memmove_stub);
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// this patches a crash found in a subroutine registered using atexit
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utils::hook::set<std::uint8_t>(0x140815D4E, 0xEB);
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}
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}
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};
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}
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REGISTER_COMPONENT(network::component)
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