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https://github.com/v2fly/v2ray-core.git
synced 2024-11-06 18:28:00 -05:00
56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
// +build linux
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package udp
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import (
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"net"
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"os"
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"syscall"
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)
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//Currently, Only IPv4 Forge is supported
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func TransmitSocket(src net.Addr, dst net.Addr) (net.Conn, error) {
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var fd int
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var err error
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fd, err = syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, 0)
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if err != nil {
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return nil, newError("failed to create fd").Base(err).AtWarning()
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}
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err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
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if err != nil {
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return nil, newError("failed to set resuse_addr").Base(err).AtWarning()
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}
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err = syscall.SetsockoptInt(fd, syscall.SOL_IP, syscall.IP_TRANSPARENT, 1)
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if err != nil {
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return nil, newError("failed to set transparent").Base(err).AtWarning()
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}
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ip := src.(*net.UDPAddr).IP.To4()
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var ip2 [4]byte
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copy(ip2[:], ip)
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srcaddr := syscall.SockaddrInet4{}
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srcaddr.Addr = ip2
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srcaddr.Port = src.(*net.UDPAddr).Port
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err = syscall.Bind(fd, &srcaddr)
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if err != nil {
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return nil, newError("failed to bind source address").Base(err).AtWarning()
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}
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ipd := dst.(*net.UDPAddr).IP.To4()
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var ip2d [4]byte
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copy(ip2d[:], ipd)
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dstaddr := syscall.SockaddrInet4{}
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dstaddr.Addr = ip2d
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dstaddr.Port = dst.(*net.UDPAddr).Port
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err = syscall.Connect(fd, &dstaddr)
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if err != nil {
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return nil, newError("failed to connect to source address").Base(err).AtWarning()
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}
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fdf := os.NewFile(uintptr(fd), "/dev/udp/")
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c, err := net.FileConn(fdf)
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if err != nil {
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return nil, newError("failed to create file conn").Base(err).AtWarning()
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}
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return c, nil
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}
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