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tcp.go
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tcp.go
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package stack
import (
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
"gvisor.dev/gvisor/pkg/waiter"
"localhost/aegis/utils"
"log"
"net"
"sync"
"syscall"
)
type TCPLike interface {
net.Conn
CloseRead() error
CloseWrite() error
}
type DialTCPFn func(dstIP tcpip.Address, dstPort uint16) (TCPLike, error)
func TCPForward(input TCPLike, output TCPLike) {
defer func() {
output.CloseWrite()
input.CloseRead()
}()
var buf [65536]byte
for {
n, err := input.Read(buf[:])
if err != nil {
break
}
_, err = output.Write(buf[:n])
if err != nil {
break
}
}
}
func NewTCPReqHandler(fn DialTCPFn) func(*tcp.ForwarderRequest) {
h := func(req *tcp.ForwarderRequest) {
id := req.ID()
go func() {
rConn, err := fn(id.LocalAddress, id.LocalPort)
if err != nil {
if utils.ToNumber(err) == syscall.ECONNREFUSED {
req.Complete(true)
} else {
req.Complete(false)
}
return
}
defer rConn.Close()
var wq waiter.Queue
ep, gErr := req.CreateEndpoint(&wq)
if gErr != nil {
req.Complete(false)
log.Printf("failed to create endpoint: %v", gErr)
return
}
req.Complete(false)
xConn := gonet.NewTCPConn(&wq, ep)
defer xConn.Close()
var myWG sync.WaitGroup
myWG.Add(1)
go func() {
defer myWG.Done()
TCPForward(rConn, xConn)
}()
TCPForward(xConn, rConn)
myWG.Wait()
}()
}
return h
}