mirror of
https://github.com/xvzc/SpoofDPI.git
synced 2024-12-22 06:15:51 +00:00
106 lines
2.3 KiB
Go
106 lines
2.3 KiB
Go
package dns
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import (
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"context"
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"fmt"
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"net"
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"strconv"
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"time"
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"github.com/miekg/dns"
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"github.com/xvzc/SpoofDPI/dns/resolver"
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"github.com/xvzc/SpoofDPI/util"
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"github.com/xvzc/SpoofDPI/util/log"
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)
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const scopeDNS = "DNS"
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type Resolver interface {
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Resolve(ctx context.Context, host string, qTypes []uint16) ([]net.IPAddr, error)
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String() string
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}
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type Dns struct {
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host string
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port string
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systemClient Resolver
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generalClient Resolver
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dohClient Resolver
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qTypes []uint16
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}
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func NewDns(config *util.Config) *Dns {
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addr := config.DnsAddr
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port := strconv.Itoa(config.DnsPort)
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var qTypes []uint16
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if config.DnsIPv4Only {
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qTypes = []uint16{dns.TypeA}
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} else {
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qTypes = []uint16{dns.TypeAAAA, dns.TypeA}
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}
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return &Dns{
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host: config.DnsAddr,
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port: port,
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systemClient: resolver.NewSystemResolver(),
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generalClient: resolver.NewGeneralResolver(net.JoinHostPort(addr, port)),
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dohClient: resolver.NewDOHResolver(addr),
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qTypes: qTypes,
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}
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}
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func (d *Dns) ResolveHost(ctx context.Context, host string, enableDoh bool, useSystemDns bool) (string, error) {
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ctx = util.GetCtxWithScope(ctx, scopeDNS)
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logger := log.GetCtxLogger(ctx)
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if ip, err := parseIpAddr(host); err == nil {
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return ip.String(), nil
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}
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clt := d.clientFactory(enableDoh, useSystemDns)
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ctx, cancel := context.WithTimeout(ctx, 3*time.Second)
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defer cancel()
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logger.Debug().Msgf("resolving %s using %s", host, clt)
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t := time.Now()
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addrs, err := clt.Resolve(ctx, host, d.qTypes)
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// addrs, err := clt.Resolve(ctx, host, []uint16{dns.TypeAAAA})
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if err != nil {
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return "", fmt.Errorf("%s: %w", clt, err)
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}
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if len(addrs) > 0 {
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d := time.Since(t).Milliseconds()
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logger.Debug().Msgf("resolved %s from %s in %d ms", addrs[0].String(), host, d)
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return addrs[0].String(), nil
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}
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return "", fmt.Errorf("could not resolve %s using %s", host, clt)
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}
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func (d *Dns) clientFactory(enableDoh bool, useSystemDns bool) Resolver {
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if useSystemDns {
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return d.systemClient
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}
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if enableDoh {
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return d.dohClient
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}
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return d.generalClient
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}
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func parseIpAddr(addr string) (*net.IPAddr, error) {
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ip := net.ParseIP(addr)
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if ip == nil {
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return nil, fmt.Errorf("%s is not an ip address", addr)
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}
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ipAddr := &net.IPAddr{
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IP: ip,
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}
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return ipAddr, nil
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}
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