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|
package main
import (
"bufio"
"fmt"
"io"
"net"
"strconv"
"strings"
"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
}
func ipcGetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
// create lines
device.mutex.RLock()
device.net.mutex.RLock()
lines := make([]string, 0, 100)
send := func(line string) {
lines = append(lines, line)
}
if !device.privateKey.IsZero() {
send("private_key=" + device.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))
}
for _, peer := range device.peers {
func() {
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))
send(fmt.Sprintf("persistent_keepalive_interval=%d",
atomic.LoadUint64(&peer.persistentKeepaliveInterval),
))
for _, ip := range device.routingTable.AllowedIPs(peer) {
send("allowed_ip=" + ip.String())
}
}()
}
device.net.mutex.RUnlock()
device.mutex.RUnlock()
// send lines
for _, line := range lines {
_, err := socket.WriteString(line + "\n")
if err != nil {
return &IPCError{
Code: ipcErrorIO,
}
}
}
return nil
}
func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
scanner := bufio.NewScanner(socket)
logInfo := device.log.Info
logError := device.log.Error
logDebug := device.log.Debug
var peer *Peer
dummy := false
deviceConfig := true
for scanner.Scan() {
// parse line
line := scanner.Text()
if line == "" {
return nil
}
parts := strings.Split(line, "=")
if len(parts) != 2 {
return &IPCError{Code: ipcErrorProtocol}
}
key := parts[0]
value := parts[1]
/* device configuration */
if deviceConfig {
switch key {
case "private_key":
var sk NoisePrivateKey
err := sk.FromHex(value)
if err != nil {
logError.Println("Failed to set private_key:", err)
return &IPCError{Code: ipcErrorInvalid}
}
device.SetPrivateKey(sk)
case "listen_port":
port, err := strconv.ParseUint(value, 10, 16)
if err != nil {
logError.Println("Failed to parse listen_port:", err)
return &IPCError{Code: ipcErrorInvalid}
}
device.net.port = uint16(port)
if err := updateBind(device); err != nil {
logError.Println("Failed to set listen_port:", err)
return &IPCError{Code: ipcErrorPortInUse}
}
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
}()
if err != nil {
logError.Println("Invalid fwmark", err)
return &IPCError{Code: ipcErrorInvalid}
}
device.net.mutex.Lock()
device.net.fwmark = uint32(fwmark)
device.net.mutex.Unlock()
case "public_key":
// switch to peer configuration
deviceConfig = false
case "replace_peers":
if value != "true" {
logError.Println("Failed to set replace_peers, invalid value:", value)
return &IPCError{Code: ipcErrorInvalid}
}
device.RemoveAllPeers()
default:
logError.Println("Invalid UAPI key (device configuration):", key)
return &IPCError{Code: ipcErrorInvalid}
}
}
/* peer configuration */
if !deviceConfig {
switch key {
case "public_key":
var pubKey NoisePublicKey
err := pubKey.FromHex(value)
if err != nil {
logError.Println("Failed to get peer by public_key:", err)
return &IPCError{Code: ipcErrorInvalid}
}
// check if public key of peer equal to device
device.mutex.RLock()
if device.publicKey.Equals(pubKey) {
// create dummy instance (not added to device)
peer = &Peer{}
dummy = true
device.mutex.RUnlock()
logInfo.Println("Ignoring peer with public key of device")
} else {
// find peer referenced
peer, _ = device.peers[pubKey]
device.mutex.RUnlock()
if peer == nil {
peer, err = device.NewPeer(pubKey)
if err != nil {
logError.Println("Failed to create new peer:", err)
return &IPCError{Code: ipcErrorInvalid}
}
}
signalSend(peer.signal.handshakeReset)
dummy = false
}
case "remove":
// remove currently selected peer from device
if value != "true" {
logError.Println("Failed to set remove, invalid value:", value)
return &IPCError{Code: ipcErrorInvalid}
}
if !dummy {
logDebug.Println("Removing", peer.String())
device.RemovePeer(peer.handshake.remoteStatic)
}
peer = &Peer{}
dummy = true
case "preshared_key":
// update PSK
peer.mutex.Lock()
err := peer.handshake.presharedKey.FromHex(value)
peer.mutex.Unlock()
if err != nil {
logError.Println("Failed to set preshared_key:", err)
return &IPCError{Code: ipcErrorInvalid}
}
case "endpoint":
// set endpoint destination
err := func() error {
peer.mutex.Lock()
defer peer.mutex.Unlock()
endpoint, err := CreateEndpoint(value)
if err != nil {
return err
}
peer.endpoint = endpoint
signalSend(peer.signal.handshakeReset)
return nil
}()
if err != nil {
logError.Println("Failed to set endpoint:", value)
return &IPCError{Code: ipcErrorInvalid}
}
case "persistent_keepalive_interval":
// update keep-alive interval
secs, err := strconv.ParseUint(value, 10, 16)
if err != nil {
logError.Println("Failed to set persistent_keepalive_interval:", err)
return &IPCError{Code: ipcErrorInvalid}
}
old := atomic.SwapUint64(
&peer.persistentKeepaliveInterval,
secs,
)
// 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}
}
if device.tun.isUp.Get() && !dummy {
peer.SendKeepAlive()
}
}
case "replace_allowed_ips":
if value != "true" {
logError.Println("Failed to set replace_allowed_ips, invalid value:", value)
return &IPCError{Code: ipcErrorInvalid}
}
if !dummy {
device.routingTable.RemovePeer(peer)
}
case "allowed_ip":
_, network, err := net.ParseCIDR(value)
if err != nil {
logError.Println("Failed to set allowed_ip:", err)
return &IPCError{Code: ipcErrorInvalid}
}
ones, _ := network.Mask.Size()
if !dummy {
device.routingTable.Insert(network.IP, uint(ones), peer)
}
default:
logError.Println("Invalid UAPI key (peer configuration):", key)
return &IPCError{Code: ipcErrorInvalid}
}
}
}
return nil
}
func ipcHandle(device *Device, socket net.Conn) {
// create buffered read/writer
defer socket.Close()
buffered := func(s io.ReadWriter) *bufio.ReadWriter {
reader := bufio.NewReader(s)
writer := bufio.NewWriter(s)
return bufio.NewReadWriter(reader, writer)
}(socket)
defer buffered.Flush()
op, err := buffered.ReadString('\n')
if err != nil {
return
}
// handle operation
var status *IPCError
switch op {
case "set=1\n":
device.log.Debug.Println("Config, set operation")
status = ipcSetOperation(device, buffered)
case "get=1\n":
device.log.Debug.Println("Config, get operation")
status = ipcGetOperation(device, buffered)
default:
device.log.Error.Println("Invalid UAPI operation:", op)
return
}
// write status
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")
}
}
|