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client.go
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client.go
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package main
import (
"encoding/base64"
"encoding/hex"
"fmt"
"log"
"net"
"os"
"strconv"
"strings"
"time"
"github.com/ogier/pflag"
"github.com/malcolmseyd/natpunch-go/client/auth"
"github.com/malcolmseyd/natpunch-go/client/cmd"
"github.com/malcolmseyd/natpunch-go/client/network"
"github.com/malcolmseyd/natpunch-go/client/util"
)
const persistentKeepalive = 25
func main() {
pflag.Usage = printUsage
continuous := pflag.BoolP("continuous", "c", false, "continuously resolve peers after they've already been resolved")
delay := pflag.Float32P("delay", "d", 2.0, "time to wait between retries (in seconds)")
pflag.Parse()
args := pflag.Args()
if len(args) < 3 {
printUsage()
os.Exit(1)
}
if os.Getuid() != 0 {
fmt.Fprintln(os.Stderr, "Must be root!")
os.Exit(1)
}
ifaceName := args[0]
serverSplit := strings.Split(args[1], ":")
serverHostname := serverSplit[0]
if len(serverSplit) < 2 {
fmt.Fprintln(os.Stderr, "Please include a port like this:", serverHostname+":PORT")
os.Exit(1)
}
serverAddr := network.HostToAddr(serverHostname)
serverPort, err := strconv.ParseUint(serverSplit[1], 10, 16)
if err != nil {
log.Fatalln("Error parsing server port:", err)
}
serverKey, err := base64.StdEncoding.DecodeString(args[2])
if err != nil || len(serverKey) != 32 {
log.Fatalln("Server key has improper formatting")
}
var serverKeyArr network.Key
copy(serverKeyArr[:], serverKey)
server := network.Server{
Hostname: serverHostname,
Addr: serverAddr,
Port: uint16(serverPort),
Pubkey: serverKeyArr,
}
run(ifaceName, server, *continuous, *delay)
}
func run(ifaceName string, server network.Server, continuous bool, delay float32) {
// get the source ip that we'll send the packet from
clientIP := network.GetClientIP(server.Addr.IP)
cmd.RunCmd("wg-quick", "up", ifaceName)
// get info about the Wireguard config
clientPort := cmd.GetClientPort(ifaceName)
clientPubkey := cmd.GetClientPubkey(ifaceName)
clientPrivkey := cmd.GetClientPrivkey(ifaceName)
client := network.Peer{
IP: clientIP,
Port: clientPort,
Pubkey: clientPubkey,
}
peerKeysStr := cmd.GetPeers(ifaceName)
var peers []network.Peer = util.MakePeerSlice(peerKeysStr)
// we're using raw sockets to spoof the source port,
// which is already being used by Wireguard
rawConn := network.SetupRawConn(&server, &client)
defer rawConn.Close()
// payload consists of client key + peer key
payload := make([]byte, 64)
copy(payload[0:32], clientPubkey[:])
totalPeers := len(peers)
resolvedPeers := 0
fmt.Println("Resolving", totalPeers, "peers")
var sendCipher, recvCipher *auth.CipherState
var index uint32
var err error
// we keep requesting if the server doesn't have one of our peers.
// this keeps running until all connections are established.
tryAgain := true
for tryAgain {
tryAgain = false
for i, peer := range peers {
if peer.Resolved && !continuous {
continue
}
// Noise handshake w/ key rotation
if time.Since(server.LastHandshake) > network.RekeyDuration {
sendCipher, recvCipher, index, err = network.Handshake(rawConn, clientPrivkey, &server, &client)
if err != nil {
if err, ok := err.(net.Error); ok && err.Timeout() {
fmt.Println("Connection to", server.Hostname, "timed out.")
tryAgain = true
break
}
fmt.Fprintln(os.Stderr, "Key rotation failed:", err)
tryAgain = true
break
}
}
fmt.Printf("(%d/%d) %s: ", resolvedPeers, totalPeers, base64.RawStdEncoding.EncodeToString(peer.Pubkey[:])[:16])
copy(payload[32:64], peer.Pubkey[:])
err := network.SendDataPacket(sendCipher, index, payload, rawConn, &server, &client)
if err != nil {
log.Println("\nError sending packet:", err)
continue
}
// throw away udp header, we have no use for it right now
body, _, packetType, n, err := network.RecvDataPacket(recvCipher, rawConn, &server, &client)
if err != nil {
if err, ok := err.(net.Error); ok && err.Timeout() {
fmt.Println("\nConnection to", server.Hostname, "timed out.")
tryAgain = true
continue
}
fmt.Println("\nError receiving packet:", err)
continue
}
if packetType != network.PacketData {
fmt.Println("\nExpected data packet, got", packetType)
}
if len(body) == 0 {
fmt.Println("not found")
tryAgain = true
continue
} else if len(body) != 4+2 {
// expected packet size, 4 bytes for ip, 2 for port
log.Println("\nError: invalid response of length", len(body))
// For debugging
fmt.Println(hex.Dump(body[:n]))
tryAgain = true
continue
}
peer.IP, peer.Port = network.ParseResponse(body)
if peer.IP == nil {
log.Println("Error parsing packet: not a valid UDP packet")
}
if !peer.Resolved {
peer.Resolved = true
resolvedPeers++
}
fmt.Println(peer.IP.String() + ":" + strconv.FormatUint(uint64(peer.Port), 10))
cmd.SetPeer(&peer, persistentKeepalive, ifaceName)
peers[i] = peer
if continuous {
// always try again if continuous
tryAgain = true
}
}
if tryAgain {
time.Sleep(time.Second * time.Duration(delay))
}
}
fmt.Print("Resolved ", resolvedPeers, " peer")
if totalPeers != 1 {
fmt.Print("s")
}
fmt.Print("\n")
}
func printUsage() {
fmt.Fprintf(os.Stderr,
"Usage: %s [OPTION]... WIREGUARD_INTERFACE SERVER_HOSTNAME:PORT SERVER_PUBKEY\n"+
"Flags:\n", os.Args[0],
)
pflag.PrintDefaults()
fmt.Fprintf(os.Stderr,
"Example:\n"+
" %s wg0 demo.wireguard.com:12345 1rwvlEQkF6vL4jA1gRzlTM7I3tuZHtdq8qkLMwBs8Uw=\n",
os.Args[0],
)
}