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vpnservice_support.go
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vpnservice_support.go
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package VPN
import (
"errors"
"log"
"net"
"os"
"strings"
"golang.org/x/sys/unix"
)
import "github.com/davecgh/go-spew/spew"
type vpnProtectedDialer struct {
vp *VPNSupport
}
func (sDialer *vpnProtectedDialer) Dial(network, Address string) (net.Conn, error) {
if strings.HasPrefix(network, "tcp") {
var addr *net.TCPAddr
var err error
addr, haveaddr := sDialer.vp.prepareddomain.tcpprepared[Address]
if haveaddr == false {
addr, err = net.ResolveTCPAddr(network, Address)
} else {
log.Println("Using Prepared Domain Name: TCP,", Address)
}
if err != nil {
return nil, err
}
fd, err := unix.Socket(unix.AF_INET6, unix.SOCK_STREAM, unix.IPPROTO_TCP)
if err != nil {
return nil, err
}
//Protect socket fd!
log.Println("Protecting Sock:", fd)
sDialer.vp.VpnSupportSet.Protect(fd)
sa := new(unix.SockaddrInet6)
spew.Dump(addr, sDialer.vp.prepareddomain.tcpprepared)
sa.Port = addr.Port
sa.ZoneId = uint32(zoneToInt(addr.Zone))
//fmt.Println(addr.IP.To16())
copy(sa.Addr[:], addr.IP.To16())
//fmt.Println(sa.Addr)
err = unix.Connect(fd, sa)
if err != nil {
return nil, err
}
file := os.NewFile(uintptr(fd), "Socket")
conn, err := net.FileConn(file)
if err != nil {
return nil, err
}
return conn, nil
}
if strings.HasPrefix(network, "udp") {
var addr *net.UDPAddr
var err error
addr, haveaddr := sDialer.vp.prepareddomain.udpprepared[Address]
if haveaddr == false {
addr, err = net.ResolveUDPAddr(network, Address)
} else {
log.Println("Using Prepared Domain Name: UDP,", Address)
}
if err != nil {
return nil, err
}
fd, err := unix.Socket(unix.AF_INET6, unix.SOCK_DGRAM, unix.IPPROTO_UDP)
if err != nil {
return nil, err
}
//Protect socket fd!
log.Println("Protecting Sock:", fd)
sDialer.vp.VpnSupportSet.Protect(fd)
sa := new(unix.SockaddrInet6)
sa.Port = addr.Port
sa.ZoneId = uint32(zoneToInt(addr.Zone))
//fmt.Println(addr.IP.To16())
copy(sa.Addr[:], addr.IP.To16())
//fmt.Println(sa.Addr)
err = unix.Connect(fd, sa)
if err != nil {
return nil, err
}
file := os.NewFile(uintptr(fd), "Socket")
conn, err := net.FileConn(file)
if err != nil {
return nil, err
}
return conn, nil
}
return nil, errors.New("Pto udf")
}
// Bigger than we need, not too big to worry about overflow
const big = 0xFFFFFF
// Decimal to integer starting at &s[i0].
// Returns number, new offset, success.
func dtoi(s string, i0 int) (n int, i int, ok bool) {
n = 0
for i = i0; i < len(s) && '0' <= s[i] && s[i] <= '9'; i++ {
n = n*10 + int(s[i]-'0')
if n >= big {
return 0, i, false
}
}
if i == i0 {
return 0, i, false
}
return n, i, true
}
func zoneToInt(zone string) int {
if zone == "" {
return 0
}
if ifi, err := net.InterfaceByName(zone); err == nil {
return ifi.Index
}
n, _, _ := dtoi(zone, 0)
return n
}