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feat!: add a custom DNS resolver in socks mode #43

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feat!: add a custom DNS resolver in socks mode #43

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19 changes: 19 additions & 0 deletions run.go
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,24 @@ func (r HostRewriter) Rewrite(ctx context.Context, request *socks5.Request) (con
return ctx, request.DestAddr
}

// SOCKS5 mapping DNS resolver
type HostResolver struct {
hostsMap map[string]string
}

func (r HostResolver) Resolve(ctx context.Context, name string) (context.Context, net.IP, error) {
dst, found := r.hostsMap[name]
if found {
return ctx, net.ParseIP(dst), nil
}

addr, err := net.ResolveIPAddr("ip", name)
if err != nil {
return ctx, nil, err
}
return ctx, addr.IP, err
}

func runAction(cmd *cobra.Command, args []string) error {
listenAddress, err := cmd.Flags().GetString("listen-address")
if err != nil {
Expand Down Expand Up @@ -113,6 +131,7 @@ func runAction(cmd *cobra.Command, args []string) error {
proxy := socks5.NewServer(
socks5.WithLogger(logrus.StandardLogger()),
socks5.WithRewriter(HostRewriter{hostsMap: hostsMap}),
socks5.WithResolver(HostResolver{hostsMap: hostsMap}),
)
if err := proxy.ListenAndServe("tcp", listenAddress); err != nil {
logrus.Fatal(err)
Expand Down