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// Copyright 2021 SNIX LLC sina@snix.ir
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// version 2 as published by the Free Software Foundation.
// 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.
package ntcp
import (
"fmt"
"net"
"strconv"
"golang.org/x/sys/unix"
)
type sockOpt struct {
localAddr net.IP
localPort uint16
}
func newNfTab() *sockOpt { return &sockOpt{localAddr: make(net.IP, 16)} }
func (p *sockOpt) HostString() string {
return fmt.Sprintf("%v:%d", p.localAddr.To4().String(), p.localPort)
}
func (p *sockOpt) PortNumber() uint16 {
return p.localPort
}
func (p *sockOpt) PortString() string {
return strconv.Itoa(int(p.localPort))
}
func (p *sockOpt) IPv4Address() net.IP {
return p.localAddr.To4()
}
func networkOpt(conn net.Conn) (*sockOpt, error) {
var nftab = newNfTab()
fd, err := conn.(*net.TCPConn).File()
if err != nil {
return nftab, err
}
defer fd.Close()
raddr, err := unix.GetsockoptIPv6Mreq(
int(fd.Fd()), unix.IPPROTO_IP, unix.SO_ORIGINAL_DST)
if err != nil {
return nftab, err
}
nftab.localAddr = net.IP(raddr.Multiaddr[4:8])
// convert big endian to little endian
nftab.localPort = uint16(raddr.Multiaddr[2])<<8 + uint16(raddr.Multiaddr[3])
return nftab, err
}
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