wireguard-go/uapi.go

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package main
import (
"bufio"
"fmt"
"io"
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"net"
"strconv"
"strings"
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"sync/atomic"
"time"
)
type IPCError struct {
Code int64
}
func (s *IPCError) Error() string {
return fmt.Sprintf("IPC error: %d", s.Code)
}
func (s *IPCError) ErrorCode() int64 {
return s.Code
}
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func ipcGetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
device.log.Debug.Println("UAPI: Processing get operation")
// create lines
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lines := make([]string, 0, 100)
send := func(line string) {
lines = append(lines, line)
}
func() {
// lock required resources
device.net.mutex.RLock()
defer device.net.mutex.RUnlock()
device.noise.mutex.RLock()
defer device.noise.mutex.RUnlock()
device.routing.mutex.RLock()
defer device.routing.mutex.RUnlock()
device.peers.mutex.Lock()
defer device.peers.mutex.Unlock()
// serialize device related values
if !device.noise.privateKey.IsZero() {
send("private_key=" + device.noise.privateKey.ToHex())
}
if device.net.port != 0 {
send(fmt.Sprintf("listen_port=%d", device.net.port))
}
if device.net.fwmark != 0 {
send(fmt.Sprintf("fwmark=%d", device.net.fwmark))
}
// serialize each peer state
for _, peer := range device.peers.keyMap {
peer.mutex.RLock()
defer peer.mutex.RUnlock()
send("public_key=" + peer.handshake.remoteStatic.ToHex())
send("preshared_key=" + peer.handshake.presharedKey.ToHex())
if peer.endpoint != nil {
send("endpoint=" + peer.endpoint.DstToString())
}
nano := atomic.LoadInt64(&peer.stats.lastHandshakeNano)
secs := nano / time.Second.Nanoseconds()
nano %= time.Second.Nanoseconds()
send(fmt.Sprintf("last_handshake_time_sec=%d", secs))
send(fmt.Sprintf("last_handshake_time_nsec=%d", nano))
send(fmt.Sprintf("tx_bytes=%d", peer.stats.txBytes))
send(fmt.Sprintf("rx_bytes=%d", peer.stats.rxBytes))
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send(fmt.Sprintf("persistent_keepalive_interval=%d",
atomic.LoadUint64(&peer.persistentKeepaliveInterval),
))
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for _, ip := range device.routing.table.AllowedIPs(peer) {
send("allowed_ip=" + ip.String())
}
}
}()
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// send lines (does not require resource locks)
for _, line := range lines {
_, err := socket.WriteString(line + "\n")
if err != nil {
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return &IPCError{
Code: ipcErrorIO,
}
}
}
return nil
}
func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
scanner := bufio.NewScanner(socket)
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logError := device.log.Error
logDebug := device.log.Debug
var peer *Peer
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dummy := false
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deviceConfig := true
for scanner.Scan() {
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// parse line
line := scanner.Text()
if line == "" {
return nil
}
parts := strings.Split(line, "=")
if len(parts) != 2 {
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return &IPCError{Code: ipcErrorProtocol}
}
key := parts[0]
value := parts[1]
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/* device configuration */
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if deviceConfig {
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switch key {
case "private_key":
var sk NoisePrivateKey
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err := sk.FromHex(value)
if err != nil {
logError.Println("Failed to set private_key:", err)
return &IPCError{Code: ipcErrorInvalid}
}
logDebug.Println("UAPI: Updating device private key")
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device.SetPrivateKey(sk)
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case "listen_port":
// parse port number
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port, err := strconv.ParseUint(value, 10, 16)
if err != nil {
logError.Println("Failed to parse listen_port:", err)
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return &IPCError{Code: ipcErrorInvalid}
}
// update port and rebind
logDebug.Println("UAPI: Updating listen port")
device.net.mutex.Lock()
device.net.port = uint16(port)
device.net.mutex.Unlock()
if err := device.BindUpdate(); err != nil {
logError.Println("Failed to set listen_port:", err)
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return &IPCError{Code: ipcErrorPortInUse}
}
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case "fwmark":
// parse fwmark field
fwmark, err := func() (uint32, error) {
if value == "" {
return 0, nil
}
mark, err := strconv.ParseUint(value, 10, 32)
return uint32(mark), err
}()
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if err != nil {
logError.Println("Invalid fwmark", err)
return &IPCError{Code: ipcErrorInvalid}
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}
logDebug.Println("UAPI: Updating fwmark")
if err := device.BindSetMark(uint32(fwmark)); err != nil {
logError.Println("Failed to update fwmark:", err)
return &IPCError{Code: ipcErrorPortInUse}
}
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case "public_key":
// switch to peer configuration
logDebug.Println("UAPI: Transition to peer configuration")
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deviceConfig = false
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case "replace_peers":
if value != "true" {
logError.Println("Failed to set replace_peers, invalid value:", value)
return &IPCError{Code: ipcErrorInvalid}
}
logDebug.Println("UAPI: Removing all peers")
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device.RemoveAllPeers()
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default:
logError.Println("Invalid UAPI key (device configuration):", key)
return &IPCError{Code: ipcErrorInvalid}
}
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}
/* peer configuration */
if !deviceConfig {
switch key {
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case "public_key":
var publicKey NoisePublicKey
err := publicKey.FromHex(value)
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if err != nil {
logError.Println("Failed to get peer by public_key:", err)
return &IPCError{Code: ipcErrorInvalid}
}
// ignore peer with public key of device
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device.noise.mutex.RLock()
equals := device.noise.publicKey.Equals(publicKey)
device.noise.mutex.RUnlock()
if equals {
peer = &Peer{}
dummy = true
}
// find peer referenced
peer = device.LookupPeer(publicKey)
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if peer == nil {
peer, err = device.NewPeer(publicKey)
if err != nil {
logError.Println("Failed to create new peer:", err)
return &IPCError{Code: ipcErrorInvalid}
}
logDebug.Println("UAPI: Created new peer:", peer.String())
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}
peer.mutex.Lock()
peer.timer.handshakeDeadline.Reset(RekeyAttemptTime)
peer.mutex.Unlock()
case "remove":
// remove currently selected peer from device
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if value != "true" {
logError.Println("Failed to set remove, invalid value:", value)
return &IPCError{Code: ipcErrorInvalid}
}
if !dummy {
logDebug.Println("UAPI: Removing peer:", peer.String())
device.RemovePeer(peer.handshake.remoteStatic)
}
peer = &Peer{}
dummy = true
case "preshared_key":
// update PSK
logDebug.Println("UAPI: Updating pre-shared key for peer:", peer.String())
peer.handshake.mutex.Lock()
err := peer.handshake.presharedKey.FromHex(value)
peer.handshake.mutex.Unlock()
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if err != nil {
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logError.Println("Failed to set preshared_key:", err)
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return &IPCError{Code: ipcErrorInvalid}
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}
case "endpoint":
// set endpoint destination
logDebug.Println("UAPI: Updating endpoint for peer:", peer.String())
err := func() error {
peer.mutex.Lock()
defer peer.mutex.Unlock()
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endpoint, err := CreateEndpoint(value)
if err != nil {
return err
}
peer.endpoint = endpoint
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peer.timer.handshakeDeadline.Reset(RekeyAttemptTime)
return nil
}()
if err != nil {
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logError.Println("Failed to set endpoint:", value)
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return &IPCError{Code: ipcErrorInvalid}
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}
case "persistent_keepalive_interval":
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// update keep-alive interval
logDebug.Println("UAPI: Updating persistent_keepalive_interval for peer:", peer.String())
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secs, err := strconv.ParseUint(value, 10, 16)
if err != nil {
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logError.Println("Failed to set persistent_keepalive_interval:", err)
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return &IPCError{Code: ipcErrorInvalid}
}
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old := atomic.SwapUint64(
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&peer.persistentKeepaliveInterval,
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secs,
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)
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// send immediate keep-alive
if old == 0 && secs != 0 {
if err != nil {
logError.Println("Failed to get tun device status:", err)
return &IPCError{Code: ipcErrorIO}
}
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if device.isUp.Get() && !dummy {
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peer.SendKeepAlive()
}
}
case "replace_allowed_ips":
logDebug.Println("UAPI: Removing all allowed IPs for peer:", peer.String())
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if value != "true" {
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logError.Println("Failed to set replace_allowed_ips, invalid value:", value)
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return &IPCError{Code: ipcErrorInvalid}
}
if dummy {
continue
}
device.routing.mutex.Lock()
device.routing.table.RemovePeer(peer)
device.routing.mutex.Unlock()
case "allowed_ip":
logDebug.Println("UAPI: Adding allowed_ip to peer:", peer.String())
_, network, err := net.ParseCIDR(value)
if err != nil {
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logError.Println("Failed to set allowed_ip:", err)
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return &IPCError{Code: ipcErrorInvalid}
}
if dummy {
continue
}
ones, _ := network.Mask.Size()
device.routing.mutex.Lock()
device.routing.table.Insert(network.IP, uint(ones), peer)
device.routing.mutex.Unlock()
default:
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logError.Println("Invalid UAPI key (peer configuration):", key)
return &IPCError{Code: ipcErrorInvalid}
}
}
}
return nil
}
func ipcHandle(device *Device, socket net.Conn) {
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// create buffered read/writer
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defer socket.Close()
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buffered := func(s io.ReadWriter) *bufio.ReadWriter {
reader := bufio.NewReader(s)
writer := bufio.NewWriter(s)
return bufio.NewReadWriter(reader, writer)
}(socket)
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defer buffered.Flush()
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op, err := buffered.ReadString('\n')
if err != nil {
return
}
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// handle operation
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var status *IPCError
switch op {
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case "set=1\n":
device.log.Debug.Println("Config, set operation")
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status = ipcSetOperation(device, buffered)
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case "get=1\n":
device.log.Debug.Println("Config, get operation")
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status = ipcGetOperation(device, buffered)
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default:
device.log.Error.Println("Invalid UAPI operation:", op)
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return
}
// write status
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if status != nil {
device.log.Error.Println(status)
fmt.Fprintf(buffered, "errno=%d\n\n", status.ErrorCode())
} else {
fmt.Fprintf(buffered, "errno=0\n\n")
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}
}