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dns.go
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/
dns.go
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package main
import (
"fmt"
"math/rand"
"net"
"net/netip"
"github.com/armon/go-socks5"
"golang.org/x/net/context"
"golang.zx2c4.com/wireguard/tun/netstack"
)
type TunnelResolver struct {
socks5.NameResolver
tnet *netstack.Net
}
func NewTunnelResolver(tnet *netstack.Net) (resolver *TunnelResolver) {
resolver = new(TunnelResolver)
resolver.tnet = tnet
return resolver
}
func (r TunnelResolver) Resolve(ctx context.Context, name string) (context.Context, net.IP, error) {
addrs, err := r.tnet.LookupContextHost(ctx, name)
if err != nil {
return nil, nil, err
}
naddr := len(addrs)
if naddr == 0 {
return nil, nil, fmt.Errorf("no address found for: %s", name)
}
rand.Shuffle(naddr, func(i, j int) {
addrs[i], addrs[j] = addrs[j], addrs[i]
})
var addr netip.Addr
for _, saddr := range addrs {
addr, err = netip.ParseAddr(saddr)
if err == nil {
break
}
}
if err != nil {
return nil, nil, err
}
return ctx, addr.AsSlice(), nil
}