mirror of
https://github.com/SamTherapy/dnscrypt.git
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113 lines
3.6 KiB
Go
113 lines
3.6 KiB
Go
package main
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import (
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"encoding/json"
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"os"
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"strings"
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"time"
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"dns.froth.zone/dnscrypt"
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"github.com/AdguardTeam/golibs/log"
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"github.com/ameshkov/dnsstamps"
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"github.com/miekg/dns"
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)
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// LookupStampArgs is the "lookup-stamp" command arguments structure
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type LookupStampArgs struct {
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Network string `short:"n" long:"network" description:"network type (tcp/udp)" default:"udp"`
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Stamp string `short:"s" long:"stamp" description:"DNSCrypt resolver stamp. Param is required." required:"true"`
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Domain string `short:"d" long:"domain" description:"Domain to resolve. Param is required." required:"true"`
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Type string `short:"t" long:"type" description:"DNS query type" default:"A"`
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}
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// LookupArgs is the "lookup" command arguments structure
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type LookupArgs struct {
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Network string `short:"n" long:"network" description:"network type (tcp/udp)" default:"udp"`
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ProviderName string `short:"p" long:"provider-name" description:"DNSCrypt resolver provider name. Param is required." required:"true"`
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PublicKey string `short:"k" long:"public-key" description:"DNSCrypt resolver public key. Param is required." required:"true"`
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ServerAddr string `short:"a" long:"addr" description:"Resolver address (IP[:port]). By default, the port is 443. Param is required." required:"true"`
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Domain string `short:"d" long:"domain" description:"Domain to resolve. Param is required." required:"true"`
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Type string `short:"t" long:"type" description:"DNS query type" default:"A"`
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}
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// LookupResult is the lookup result that contains the cert info and the query response
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type LookupResult struct {
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Certificate struct {
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Serial uint32 `json:"serial"`
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EsVersion string `json:"encryption"`
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NotAfter time.Time `json:"not_after"`
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NotBefore time.Time `json:"not_before"`
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} `json:"certificate"`
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Reply *dns.Msg `json:"reply"`
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}
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// lookup performs a DNS lookup, prints DNSCrypt info and lookup results
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func lookup(args LookupArgs) {
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serverPk, err := dnscrypt.HexDecodeKey(args.PublicKey)
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if err != nil {
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log.Fatalf("invalid resolver public key: %v", err)
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}
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stamp := dnsstamps.ServerStamp{
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ProviderName: args.ProviderName,
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ServerPk: serverPk,
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ServerAddrStr: args.ServerAddr,
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Proto: dnsstamps.StampProtoTypeDNSCrypt,
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}
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lookupStamp(LookupStampArgs{
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Network: args.Network,
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Stamp: stamp.String(),
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Domain: args.Domain,
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Type: args.Type,
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})
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}
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// lookupStamp performs a DNS lookup, prints DNSCrypt cert info and lookup results
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func lookupStamp(args LookupStampArgs) {
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c := &dnscrypt.Client{
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Net: args.Network,
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Timeout: 10 * time.Second,
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}
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ri, err := c.Dial(args.Stamp)
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if err != nil {
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log.Fatalf("failed to establish connection with the server: %v", err)
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}
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res := LookupResult{}
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res.Certificate.Serial = ri.ResolverCert.Serial
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res.Certificate.NotAfter = time.Unix(int64(ri.ResolverCert.NotAfter), 0)
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res.Certificate.NotBefore = time.Unix(int64(ri.ResolverCert.NotBefore), 0)
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res.Certificate.EsVersion = ri.ResolverCert.EsVersion.String()
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dnsType, ok := dns.StringToType[strings.ToUpper(args.Type)]
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if !ok {
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log.Fatalf("invalid type %s", args.Type)
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}
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req := &dns.Msg{}
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req.Id = dns.Id()
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req.RecursionDesired = true
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req.Question = []dns.Question{
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{
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Name: dns.Fqdn(args.Domain),
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Qtype: dnsType,
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Qclass: dns.ClassINET,
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},
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}
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reply, err := c.Exchange(req, ri)
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if err != nil {
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log.Fatalf("failed to resolve %s %s", args.Type, args.Domain)
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}
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res.Reply = reply
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b, err := json.MarshalIndent(res, "", " ")
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if err != nil {
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log.Fatalf("failed to marshal result to json: %v", err)
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}
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_, _ = os.Stdout.WriteString(string(b) + "\n")
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}
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