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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"context"
"fmt"
"os"
"github.com/multiformats/go-multiaddr"
"github.com/spf13/cobra"
"github.com/algorand/go-algorand/network/p2p/dnsaddr"
"github.com/algorand/go-algorand/tools/network/cloudflare"
)
var (
dnsaddrDomain string
secure bool
cmdMultiaddrs []string
nodeSize int
)
func init() {
dnsaddrCmd.AddCommand(dnsaddrTreeCmd)
dnsaddrTreeCmd.Flags().StringVarP(&dnsaddrDomain, "domain", "d", "", "Top level domain")
dnsaddrTreeCmd.MarkFlagRequired("domain")
dnsaddrTreeCmd.Flags().BoolVarP(&secure, "secure", "s", true, "Enable dnssec")
dnsaddrTreeCmd.AddCommand(dnsaddrTreeCreateCmd)
dnsaddrTreeCreateCmd.Flags().StringArrayVarP(&cmdMultiaddrs, "multiaddrs", "m", []string{}, "multiaddrs to add")
dnsaddrTreeCreateCmd.Flags().StringVarP(&dnsaddrDomain, "domain", "d", "", "Top level domain")
dnsaddrTreeCreateCmd.Flags().IntVarP(&nodeSize, "node-size", "n", 50, "Number of multiaddrs entries per TXT record")
dnsaddrTreeCreateCmd.MarkFlagRequired("domain")
dnsaddrTreeCreateCmd.MarkFlagRequired("multiaddrs")
dnsaddrTreeCmd.AddCommand(dnsaddrTreeDeleteCmd)
dnsaddrTreeDeleteCmd.Flags().StringVarP(&dnsaddrDomain, "domain", "d", "", "Top level domain")
dnsaddrTreeDeleteCmd.MarkFlagRequired("domain")
}
var dnsaddrCmd = &cobra.Command{
Use: "dnsaddr",
Short: "Get, Set, and List Dnsaddr entries",
Long: "Get, Set, and List Dnsaddr entries",
Run: func(cmd *cobra.Command, args []string) {
// Fall back
cmd.HelpFunc()(cmd, args)
},
}
var dnsaddrTreeCmd = &cobra.Command{
Use: "tree",
Short: "Recursively resolves and lists the dnsaddr entries of the given domain",
Long: "Recursively resolves and lists the dnsaddr entries of the given domain",
Run: func(cmd *cobra.Command, args []string) {
controller := dnsaddr.NewMultiaddrDNSResolveController(secure, "")
addrs, err := dnsaddr.MultiaddrsFromResolver(dnsaddrDomain, controller)
if err != nil {
fmt.Printf("%s\n", err.Error())
return
}
for _, addr := range addrs {
fmt.Printf("%s\n", addr.String())
}
},
}
var dnsaddrTreeDeleteCmd = &cobra.Command{
Use: "delete",
Short: "Recursively resolves and deletes the dnsaddr entries of the given domain",
Long: "Recursively resolves and deletes the dnsaddr entries of the given domain",
Run: func(cmd *cobra.Command, args []string) {
addr, err := multiaddr.NewMultiaddr(fmt.Sprintf("/dnsaddr/%s", dnsaddrDomain))
if err != nil {
fmt.Printf("unable to construct multiaddr for %s : %v\n", dnsaddrDomain, err)
return
}
controller := dnsaddr.NewMultiaddrDNSResolveController(secure, "")
cfZoneID, cfToken, err := getClouldflareCredentials()
if err != nil {
fmt.Fprintf(os.Stderr, "error getting DNS credentials: %v", err)
return
}
cloudflareDNS := cloudflare.NewDNS(cfZoneID, cfToken)
var recordsToDelete []cloudflare.DNSRecordResponseEntry
err = dnsaddr.Iterate(addr, controller, func(entryFrom multiaddr.Multiaddr, entries []multiaddr.Multiaddr) error {
domain, _ := entryFrom.ValueForProtocol(multiaddr.P_DNSADDR)
name := fmt.Sprintf("_dnsaddr.%s", domain)
fmt.Printf("listing records for %s\n", name)
records, err0 := cloudflareDNS.ListDNSRecord(context.Background(), "TXT", name, "", "", "", "")
if err0 != nil {
fmt.Printf("erroring listing dns records for %s %s\n", domain, err)
return err
}
for _, record := range records {
fmt.Printf("found record to delete %s:%s\n", record.Name, record.Content)
recordsToDelete = append(recordsToDelete, record)
}
return nil
})
if err != nil {
fmt.Printf("%s\n", err.Error())
return
}
err = checkedDelete(recordsToDelete, cloudflareDNS)
if err != nil {
fmt.Printf("error deleting records: %s\n", err)
}
},
}
var dnsaddrTreeCreateCmd = &cobra.Command{
Use: "create",
Short: "Creates a tree of entries containing the multiaddrs at the provided root domain",
Long: "Creates a tree of entries containing the multiaddrs at the provided root domain",
Run: func(cmd *cobra.Command, args []string) {
if len(cmdMultiaddrs) == 0 {
fmt.Printf("must provide multiaddrs to put in the DNS records")
return
}
// Generate the dnsaddr entries required for the full tree
var dnsaddrsTo []string
for i := 0; i < len(cmdMultiaddrs)/nodeSize; i++ {
dnsaddrsTo = append(dnsaddrsTo, fmt.Sprintf("%d%s", i, dnsaddrDomain))
}
dnsaddrsFrom := []string{fmt.Sprintf("_dnsaddr.%s", dnsaddrDomain)}
entries, err := getEntries(dnsaddrsFrom[0], "TXT")
if err != nil {
fmt.Printf("failed fetching entries for %s\n", dnsaddrsFrom[0])
os.Exit(1)
}
if len(entries) > 0 {
for _, entry := range entries {
fmt.Printf("found entry %s => %s\n", entry.Name, entry.Content)
}
fmt.Printf("found entries already existing at %s, bailing out\n", dnsaddrsFrom[0])
os.Exit(1)
}
for _, addrTo := range dnsaddrsTo {
dnsaddrsFrom = append(dnsaddrsFrom, fmt.Sprintf("_dnsaddr.%s", addrTo))
}
for _, from := range dnsaddrsFrom {
for i := 0; i < nodeSize; i++ {
if len(dnsaddrsTo) > 0 {
newDnsaddr := fmt.Sprintf("dnsaddr=/dnsaddr/%s", dnsaddrsTo[len(dnsaddrsTo)-1])
fmt.Printf("writing %s => %s\n", from, newDnsaddr)
err := doAddTXT(from, newDnsaddr)
if err != nil {
fmt.Printf("failed writing dnsaddr entry %s: %s\n", newDnsaddr, err)
os.Exit(1)
}
dnsaddrsTo = dnsaddrsTo[:len(dnsaddrsTo)-1]
continue
}
newDnsaddr := fmt.Sprintf("dnsaddr=%s", cmdMultiaddrs[len(cmdMultiaddrs)-1])
fmt.Printf("writing %s => %s\n", from, newDnsaddr)
err := doAddTXT(from, newDnsaddr)
if err != nil {
fmt.Printf("failed writing dns entry %s\n", err)
os.Exit(1)
}
cmdMultiaddrs = cmdMultiaddrs[:len(cmdMultiaddrs)-1]
if len(cmdMultiaddrs) == 0 {
return
}
}
}
},
}
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