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  1. 15
      .gitignore
  2. 201
      LICENSE
  3. 50
      app/premake5.lua
  4. 361
      app/src/app.cpp
  5. 11
      package.json
  6. 19
      premake5.lua

15
.gitignore vendored
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/vendor/
/bin/
/bin-int/
/.vscode/
/.vs/
/docs/
/.cache/
**compile_commands.json
**.log
**.sln
**.vcxproj*
**.make
**Makefile
**dependencies.lua
**linker.lua

201
LICENSE
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Apache License
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50
app/premake5.lua
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project "App"
kind "ConsoleApp"
language "C++"
cppdialect "C++20"
systemversion "latest"
targetdir("%{wks.location}/bin/" .. outputdir .. "/%{prj.name}")
objdir("%{wks.location}/bin-int/" .. outputdir .. "/%{prj.name}")
include "linker.lua"
files
{
"src/**.h",
"src/**.cpp"
}
filter "configurations:Debug"
defines
{
"BK_DEBUG",
"DEBUG"
}
runtime "Debug"
symbols "on"
filter "configurations:Release"
defines
{
"BK_RELEASE",
"NDEBUG"
}
runtime "Release"
optimize "on"
filter "system:windows"
buildoptions { "/MT", "/utf-8" }
staticruntime "on"
defines
{
"BK_PLATFORM_WINDOWS"
}
filter "system:linux"
staticruntime "on"
defines
{
"BK_PLATFORM_LINUX"
}

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app/src/app.cpp
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#include "bakanet/core/ip_address.h"
#include "bakanet/core/ip_protocol.h"
#include "bakanet/core/socket.h"
#include "bakatools/container/types.h"
#include "bakatools/logging/assert.h"
#include "bakatools/logging/log.h"
#include <bakatools.h>
#include <bakanet.h>
#include <cerrno>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <functional>
#include <sys/epoll.h>
#include <thread>
#include <tuple>
#include <vector>
#include <string>
#define CREATE_MAPPING(var, ...) std::vector<std::pair<std::string, std::string>> var = { __VA_ARGS__ }
#define MAKE_RANGE(var, ...) range ( var, __VA_ARGS__)
#define BIND(listener, target) { listener, target }
#define MAX_EVENTS 10
#define MAX_CONNECTOR_WORKERS 8
#define MAX_LISTENER_CONNECTION 50
#define MAX_PACKET_SIZE 64000
using namespace Bk;
using namespace Bk::Net;
void range(std::vector<std::pair<std::string, std::string>>& binds, std::string listener, std::string target, int min, int max)
{
for(int i = min; i <= max; i++)
binds.push_back({ listener + ":" + std::to_string(i), target + ":" + std::to_string(i) });
}
int setnonblocking(int sock)
{
int result;
int flags;
flags = ::fcntl(sock, F_GETFL, 0);
if (flags == -1)
{
return -1; // error
}
flags |= O_NONBLOCK;
result = fcntl(sock , F_SETFL , flags);
return result;
}
struct Binder
{
Scope<Socket> src;
std::tuple<std::string, u16> listener;
std::tuple<std::string, u16> target;
Binder(Socket* src, std::tuple<std::string, u16> listener, std::tuple<std::string, u16> target)
:src(src), listener(listener), target(target) { }
};
struct Bridge
{
Scope<Socket> downstream, upstream;
Bridge(Socket* upstream, Socket* downstream)
:upstream(upstream), downstream(downstream) { }
};
using PollCallback = std::function<void(int)>;
enum class PollEvent : i64
{
None = 0,
Accept = EPOLLIN | EPOLLET,
Readable = EPOLLIN | EPOLLET,
Writable = EPOLLOUT,
Closed = EPOLLRDHUP,
Error = EPOLLERR
};
class EventPoll
{
public:
EventPoll(u16 maxEvents = 10)
{
instance = epoll_create1(0);
BK_ASSERT(instance != -1);
events.resize(maxEvents);
}
void add(int fd, int nbEvents = 0, ...)
{
va_list args;
va_start(args, nbEvents);
struct epoll_event ev;
ev.events = 0;
for(int i = 0; i < nbEvents; i++) ev.events = ev.events | va_arg(args, i64);
ev.data.fd = fd;
BK_STATIC_MSG_ASSERT(epoll_ctl(instance, EPOLL_CTL_ADD, fd, &ev) != -1, "epoll_ctl: listen_sock");
}
void on(PollEvent event, PollCallback callback)
{
callbacks[event] = callback;
}
void wait(int timeout = -1)
{
int waiters = epoll_wait(instance, events.data(), events.size(), timeout);
BK_STATIC_MSG_ASSERT(waiters != -1, "epoll_ctl: listen_sock");
for(int i = 0; i < waiters; i++)
{
if((events[i].events & (i64)PollEvent::Closed) != 0 && callbacks[PollEvent::Closed]) callbacks[PollEvent::Closed](events[i].data.fd);
else if((events[i].events & (i64)PollEvent::Readable) != 0 && callbacks[PollEvent::Readable]) callbacks[PollEvent::Readable](events[i].data.fd);
else if((events[i].events & (i64)PollEvent::Accept) != 0 && callbacks[PollEvent::Accept]) callbacks[PollEvent::Accept](events[i].data.fd);
else if((events[i].events & (i64)PollEvent::Writable) != 0 && callbacks[PollEvent::Writable]) callbacks[PollEvent::Writable](events[i].data.fd);
else if((events[i].events & (i64)PollEvent::Error) != 0 && callbacks[PollEvent::Error]) callbacks[PollEvent::Error](events[i].data.fd);
}
}
private:
std::vector<struct epoll_event> events;
int instance = -1;
std::map<PollEvent, PollCallback> callbacks;
};
class Connector
{
public:
Connector()
{
bridges.reserve(10);
ePoll.on(PollEvent::Accept, [this](int fd)
{
int index = findBridge(fd);
if(index > -1)
{
auto& bridge = bridges[index];
if (bridge.upstream->get_raw_socket() == fd)
{
std::vector<char> packet = bridge.upstream->obtain(MAX_PACKET_SIZE);
if(packet.size() > 0) bridge.downstream->emit(packet);
return;
}
std::vector<char> packet = bridge.downstream->obtain(MAX_PACKET_SIZE);
if(packet.size() > 0) bridge.upstream->emit(packet);
}
});
ePoll.on(PollEvent::Closed, [this](int fd)
{
int i = findBridge(fd);
BK_INFO("Deleted bridge N° {0} - Remaining bridges {1}\n", i, bridges.size() -1);
if(i > -1) bridges.erase(bridges.begin() + i);
});
}
~Connector()
{
if(running) {
stop();
worker.join();
}
}
int findBridge(int fd)
{
for(int i = 0; i < bridges.size(); i++)
{
if (bridges[i].upstream->get_raw_socket() == fd || bridges[i].downstream->get_raw_socket() == fd) {
return i;
}
}
return -1;
}
void start()
{
if(!running)
{
running = true;
worker = std::thread([this]
{
while(running)
{
std::unique_lock<std::mutex> lock(resource_mutex);
condition.wait(lock, [this] {
return !bridges.empty() || !running;
});
if(!running || bridges.empty()) return;
ePoll.wait();
}
});
}
}
void stop()
{
std::unique_lock<std::mutex> lock(resource_mutex);
running = false;
condition.notify_one();
}
void add(Bridge bridge)
{
{
std::unique_lock<std::mutex> lock(resource_mutex);
BK_STATIC_ASSERT(bridge.upstream->conn());
setnonblocking(bridge.upstream->get_raw_socket());
ePoll.add(bridge.upstream->get_raw_socket(), 2, PollEvent::Readable, PollEvent::Closed);
ePoll.add(bridge.downstream->get_raw_socket(), 2, PollEvent::Readable, PollEvent::Closed);
bridges.push_back(std::move(bridge));
}
BK_INFO("Added bridge - Total bridges {0}\n", bridges.size() - 1);
condition.notify_one();
}
private:
std::thread worker;
std::condition_variable condition;
std::mutex resource_mutex;
bool running = false;
int instance;
EventPoll ePoll;
std::vector<Bridge> bridges;
};
std::tuple<std::string, u32> parseConnection(std::string conn)
{
size_t pos = conn.find_first_of(":");
if(pos != std::string::npos) {
auto ip = conn.substr(0, pos);
auto port = std::stoi(conn.substr(pos + 1, conn.length()));
return std::tuple(ip, port);
} else if (conn.length()) return std::tuple("", std::stoi(conn.substr(0, conn.length())));
return std::tuple("", 0);
}
class TcpProxy
{
public:
TcpProxy(const std::vector<std::pair<std::string, std::string>>& proxyBinds)
{
binds.reserve(proxyBinds.size());
BK_INFO("Starting binds (count: {0})", proxyBinds.size());
int i = 0;
for (auto& proxyBind : proxyBinds)
{
std::tuple<std::string, u16> listener = parseConnection(proxyBind.first);
std::tuple<std::string, u16> target = parseConnection(proxyBind.second);
BK_INFO("{0}. Buiding binder [{1}:{2}] -> [{3}:{4}]",
i + 1,
std::get<0>(listener),
std::get<1>(listener),
std::get<0>(target),
std::get<1>(target)
);
binds.insert(binds.begin() + i, Binder(
Socket::create(std::get<0>(listener), std::get<1>(listener), IpProtocol::TCP),
listener,
target
)
);
BK_ASSERT(binds[i].src->init());
BK_ASSERT(binds[i].src->start(MAX_LISTENER_CONNECTION));
ePoll.add(binds[i].src->get_raw_socket(), 1, PollEvent::Accept);
i++;
}
ePoll.on(PollEvent::Accept, [this] (int fd)
{
auto& bind = binds[findBinder(fd)];
Socket* conn = bind.src->ack();
Socket* target = Socket::create(IpAddress(std::get<0>(bind.target)), std::get<1>(bind.target), IpProtocol::TCP);
BK_INFO("New connection");
BK_INFO("Connection info :");
BK_INFO("PORT BIND [{0}:{1}]", std::get<1>(bind.listener), std::get<1>(bind.target));
BK_INFO("TARGET [{0}]", target->get_ip());
BK_INFO("LISTENER [{0}]", bind.src->get_ip());
BK_INFO("CLIENT [{0}]", conn->get_ip());
setnonblocking(conn->get_raw_socket());
if(connectorPtr >= connectors.size()) connectorPtr = 0;
BK_INFO("Forwarding to connector N°{0}\n", connectorPtr);
connectors[connectorPtr].add(Bridge(target, conn));
connectorPtr++;
});
}
int findBinder(int fd)
{
for(int i = 0; i < binds.size(); i++)
{
if (binds[i].src->get_raw_socket() == fd) {
return i;
}
}
return -1;
}
void start()
{
running = true;
for(auto& connector : connectors)
{
connectorPtr++;
BK_INFO("Starting connector N°{0}", connectorPtr);
connector.start();
}
printf("\n");
while (running) {
ePoll.wait();
}
}
private:
bool running = false;
std::vector<Binder> binds;
EventPoll ePoll;
std::array<Connector, MAX_CONNECTOR_WORKERS> connectors;
int connectorPtr = 0;
};
int main()
{
Log::Init("Bakanet");
BK_INFO("Epoll events types");
BK_INFO("EPOLLIN {0} {0:b}", (u32)EPOLLIN);
BK_INFO("EPOLLOUT {0} {0:b}", (u32)EPOLLOUT);
BK_INFO("EPOLLET {0} {0:b}", (u32)EPOLLET);
BK_INFO("EPOLLHUP {0} {0:b}", (u32)EPOLLHUP);
BK_INFO("EPOLLERR {0} {0:b}", (u32)EPOLLERR);
BK_INFO("EPOLLRDHUP {0} {0:b}", (u32)EPOLLRDHUP);
printf("\n");
CREATE_MAPPING(proxyBinds,
BIND("192.168.1.128:25000", "192.168.1.128:25001"),
BIND("192.168.1.128:25001", "192.168.1.128:25002"),
BIND("192.168.1.128:25002", "192.168.1.128:25003"),
BIND("192.168.1.128:25003", "192.168.1.128:25004"),
BIND("192.168.1.128:25004", "192.168.1.128:25005"),
BIND("192.168.1.128:25005", "192.168.1.128:25006"),
BIND("192.168.1.128:25006", "192.168.1.128:25007"),
BIND("192.168.1.128:25007", "192.168.1.159:22")
);
TcpProxy initiator(proxyBinds);
initiator.start();
return 0;
}

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package.json
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{
"name": "transProxy",
"author": "anulax1225",
"git": "",
"packages": [
{
"author": "anulax",
"name": "bakanet"
}
]
}

19
premake5.lua
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workspace "transProxy"
architecture "x64"
configurations { "Debug", "Release" }
startproject "App"
flags
{
"MultiProcessorCompile"
}
linkgroups "On"
outputdir = "%{cfg.system}-%{cfg.architecture}-%{cfg.buildcfg}"
include "dependencies.lua"
group "App"
include "app"
group ""
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