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dialwithip.go
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dialwithip.go
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// Copyright (c) 2016-present Cloud <cloud@txthinking.com>
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 3 of the GNU General Public
// License 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.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package dialwithip
import (
"errors"
"net"
"github.com/likev/brook"
"github.com/txthinking/socks5"
)
type DialWithIP struct {
IP4 net.IP
IP6 net.IP
}
func NewDialWithIP(ip4, ip6 string) (*DialWithIP, error) {
if ip4 != "" && (net.ParseIP(ip4) == nil || net.ParseIP(ip4).To4() == nil) {
return nil, errors.New("Invalid dial with IP")
}
if ip6 != "" && (net.ParseIP(ip6) == nil || net.ParseIP(ip6).To4() != nil) {
return nil, errors.New("Invalid dial with IP")
}
d := &DialWithIP{}
if ip4 != "" {
d.IP4 = net.ParseIP(ip4).To4()
}
if ip6 != "" {
d.IP6 = net.ParseIP(ip6).To16()
}
return d, nil
}
func (p *DialWithIP) TouchBrook() {
brook.DialTCP = func(network string, laddr, raddr string) (net.Conn, error) {
var la, ra *net.TCPAddr
if laddr != "" {
var err error
la, err = net.ResolveTCPAddr(network, laddr)
if err != nil {
return nil, err
}
}
a, err := brook.Resolve(network, raddr)
if err != nil {
return nil, err
}
ra = a.(*net.TCPAddr)
if la == nil {
if ra.IP.To4() != nil && p.IP4 != nil {
la = &net.TCPAddr{IP: p.IP4}
}
if ra.IP.To4() == nil && p.IP6 != nil {
la = &net.TCPAddr{IP: p.IP6}
}
}
return net.DialTCP(network, la, ra)
}
brook.DialUDP = func(network string, laddr, raddr string) (net.Conn, error) {
var la, ra *net.UDPAddr
if laddr != "" {
var err error
la, err = net.ResolveUDPAddr(network, laddr)
if err != nil {
return nil, err
}
}
a, err := brook.Resolve(network, raddr)
if err != nil {
return nil, err
}
ra = a.(*net.UDPAddr)
if la == nil {
if ra.IP.To4() != nil && p.IP4 != nil {
la = &net.UDPAddr{IP: p.IP4}
}
if ra.IP.To4() == nil && p.IP6 != nil {
la = &net.UDPAddr{IP: p.IP6}
}
}
return net.DialUDP(network, la, ra)
}
socks5.DialTCP = brook.DialTCP
socks5.DialUDP = brook.DialUDP
}