mirror of
https://git.zx2c4.com/wireguard-go
synced 2024-11-15 09:15:14 +01:00
a1c265b0c5
bufio is not required. strings.Builder is cheaper than bytes.Buffer for constructing strings. io.Writer is more flexible than io.StringWriter, and just as cheap (when used with io.WriteString). Run gofmt. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
465 lines
10 KiB
Go
465 lines
10 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2017-2020 WireGuard LLC. All Rights Reserved.
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*/
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package device
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import (
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"bufio"
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"errors"
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"fmt"
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"io"
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"net"
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"strconv"
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"strings"
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"sync/atomic"
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"time"
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"golang.zx2c4.com/wireguard/conn"
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"golang.zx2c4.com/wireguard/ipc"
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)
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type IPCError struct {
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int64
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}
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func (s IPCError) Error() string {
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return fmt.Sprintf("IPC error: %d", s.int64)
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}
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func (s IPCError) ErrorCode() int64 {
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return s.int64
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}
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func (device *Device) IpcGetOperation(w io.Writer) error {
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lines := make([]string, 0, 100)
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send := func(line string) {
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lines = append(lines, line)
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}
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func() {
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// lock required resources
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device.net.RLock()
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defer device.net.RUnlock()
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device.staticIdentity.RLock()
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defer device.staticIdentity.RUnlock()
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device.peers.RLock()
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defer device.peers.RUnlock()
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// serialize device related values
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if !device.staticIdentity.privateKey.IsZero() {
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send("private_key=" + device.staticIdentity.privateKey.ToHex())
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}
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if device.net.port != 0 {
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send(fmt.Sprintf("listen_port=%d", device.net.port))
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}
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if device.net.fwmark != 0 {
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send(fmt.Sprintf("fwmark=%d", device.net.fwmark))
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}
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// serialize each peer state
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for _, peer := range device.peers.keyMap {
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peer.RLock()
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defer peer.RUnlock()
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send("public_key=" + peer.handshake.remoteStatic.ToHex())
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send("preshared_key=" + peer.handshake.presharedKey.ToHex())
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send("protocol_version=1")
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if peer.endpoint != nil {
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send("endpoint=" + peer.endpoint.DstToString())
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}
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nano := atomic.LoadInt64(&peer.stats.lastHandshakeNano)
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secs := nano / time.Second.Nanoseconds()
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nano %= time.Second.Nanoseconds()
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send(fmt.Sprintf("last_handshake_time_sec=%d", secs))
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send(fmt.Sprintf("last_handshake_time_nsec=%d", nano))
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send(fmt.Sprintf("tx_bytes=%d", atomic.LoadUint64(&peer.stats.txBytes)))
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send(fmt.Sprintf("rx_bytes=%d", atomic.LoadUint64(&peer.stats.rxBytes)))
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send(fmt.Sprintf("persistent_keepalive_interval=%d", atomic.LoadUint32(&peer.persistentKeepaliveInterval)))
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for _, ip := range device.allowedips.EntriesForPeer(peer) {
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send("allowed_ip=" + ip.String())
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}
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}
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}()
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// send lines (does not require resource locks)
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for _, line := range lines {
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_, err := io.WriteString(w, line+"\n")
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if err != nil {
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return &IPCError{ipc.IpcErrorIO}
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}
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}
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return nil
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}
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func (device *Device) IpcSetOperation(r io.Reader) error {
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scanner := bufio.NewScanner(r)
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logError := device.log.Error
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logDebug := device.log.Debug
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var peer *Peer
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dummy := false
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createdNewPeer := false
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deviceConfig := true
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for scanner.Scan() {
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// parse line
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line := scanner.Text()
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if line == "" {
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return nil
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}
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parts := strings.Split(line, "=")
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if len(parts) != 2 {
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return &IPCError{ipc.IpcErrorProtocol}
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}
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key := parts[0]
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value := parts[1]
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/* device configuration */
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if deviceConfig {
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switch key {
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case "private_key":
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var sk NoisePrivateKey
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err := sk.FromMaybeZeroHex(value)
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if err != nil {
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logError.Println("Failed to set private_key:", err)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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logDebug.Println("UAPI: Updating private key")
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device.SetPrivateKey(sk)
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case "listen_port":
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// parse port number
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port, err := strconv.ParseUint(value, 10, 16)
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if err != nil {
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logError.Println("Failed to parse listen_port:", err)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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// update port and rebind
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logDebug.Println("UAPI: Updating listen port")
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device.net.Lock()
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device.net.port = uint16(port)
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device.net.Unlock()
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if err := device.BindUpdate(); err != nil {
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logError.Println("Failed to set listen_port:", err)
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return &IPCError{ipc.IpcErrorPortInUse}
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}
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case "fwmark":
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// parse fwmark field
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fwmark, err := func() (uint32, error) {
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if value == "" {
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return 0, nil
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}
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mark, err := strconv.ParseUint(value, 10, 32)
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return uint32(mark), err
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}()
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if err != nil {
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logError.Println("Invalid fwmark", err)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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logDebug.Println("UAPI: Updating fwmark")
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if err := device.BindSetMark(uint32(fwmark)); err != nil {
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logError.Println("Failed to update fwmark:", err)
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return &IPCError{ipc.IpcErrorPortInUse}
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}
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case "public_key":
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// switch to peer configuration
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logDebug.Println("UAPI: Transition to peer configuration")
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deviceConfig = false
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case "replace_peers":
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if value != "true" {
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logError.Println("Failed to set replace_peers, invalid value:", value)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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logDebug.Println("UAPI: Removing all peers")
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device.RemoveAllPeers()
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default:
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logError.Println("Invalid UAPI device key:", key)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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}
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/* peer configuration */
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if !deviceConfig {
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switch key {
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case "public_key":
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var publicKey NoisePublicKey
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err := publicKey.FromHex(value)
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if err != nil {
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logError.Println("Failed to get peer by public key:", err)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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// ignore peer with public key of device
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device.staticIdentity.RLock()
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dummy = device.staticIdentity.publicKey.Equals(publicKey)
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device.staticIdentity.RUnlock()
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if dummy {
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peer = &Peer{}
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} else {
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peer = device.LookupPeer(publicKey)
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}
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createdNewPeer = peer == nil
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if createdNewPeer {
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peer, err = device.NewPeer(publicKey)
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if err != nil {
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logError.Println("Failed to create new peer:", err)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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if peer == nil {
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dummy = true
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peer = &Peer{}
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} else {
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logDebug.Println(peer, "- UAPI: Created")
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}
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}
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case "update_only":
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// allow disabling of creation
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if value != "true" {
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logError.Println("Failed to set update only, invalid value:", value)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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if createdNewPeer && !dummy {
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device.RemovePeer(peer.handshake.remoteStatic)
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peer = &Peer{}
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dummy = true
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}
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case "remove":
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// remove currently selected peer from device
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if value != "true" {
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logError.Println("Failed to set remove, invalid value:", value)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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if !dummy {
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logDebug.Println(peer, "- UAPI: Removing")
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device.RemovePeer(peer.handshake.remoteStatic)
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}
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peer = &Peer{}
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dummy = true
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case "preshared_key":
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// update PSK
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logDebug.Println(peer, "- UAPI: Updating preshared key")
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peer.handshake.mutex.Lock()
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err := peer.handshake.presharedKey.FromHex(value)
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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{ipc.IpcErrorInvalid}
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}
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case "endpoint":
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// set endpoint destination
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logDebug.Println(peer, "- UAPI: Updating endpoint")
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err := func() error {
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peer.Lock()
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defer peer.Unlock()
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endpoint, err := conn.CreateEndpoint(value)
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if err != nil {
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return err
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}
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peer.endpoint = endpoint
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return nil
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}()
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if err != nil {
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logError.Println("Failed to set endpoint:", err, ":", value)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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case "persistent_keepalive_interval":
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// update persistent keepalive interval
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logDebug.Println(peer, "- UAPI: Updating persistent keepalive interval")
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secs, err := strconv.ParseUint(value, 10, 16)
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if err != nil {
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logError.Println("Failed to set persistent keepalive interval:", err)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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old := atomic.SwapUint32(&peer.persistentKeepaliveInterval, uint32(secs))
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// send immediate keepalive if we're turning it on and before it wasn't on
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if old == 0 && secs != 0 {
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if err != nil {
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logError.Println("Failed to get tun device status:", err)
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return &IPCError{ipc.IpcErrorIO}
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}
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if device.isUp.Get() && !dummy {
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peer.SendKeepalive()
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}
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}
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case "replace_allowed_ips":
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logDebug.Println(peer, "- UAPI: Removing all allowedips")
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if value != "true" {
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logError.Println("Failed to replace allowedips, invalid value:", value)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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if dummy {
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continue
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}
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device.allowedips.RemoveByPeer(peer)
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case "allowed_ip":
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logDebug.Println(peer, "- UAPI: Adding allowedip")
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_, network, err := net.ParseCIDR(value)
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if err != nil {
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logError.Println("Failed to set allowed ip:", err)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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if dummy {
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continue
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}
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ones, _ := network.Mask.Size()
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device.allowedips.Insert(network.IP, uint(ones), peer)
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case "protocol_version":
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if value != "1" {
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logError.Println("Invalid protocol version:", value)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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default:
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logError.Println("Invalid UAPI peer key:", key)
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return &IPCError{ipc.IpcErrorInvalid}
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}
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}
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}
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return nil
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}
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func (device *Device) IpcGet() (string, error) {
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buf := new(strings.Builder)
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if err := device.IpcGetOperation(buf); err != nil {
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return "", err
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}
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return buf.String(), nil
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}
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func (device *Device) IpcSet(uapiConf string) error {
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return device.IpcSetOperation(strings.NewReader(uapiConf))
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}
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func (device *Device) IpcHandle(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 {
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reader := bufio.NewReader(s)
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writer := bufio.NewWriter(s)
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return bufio.NewReadWriter(reader, writer)
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}(socket)
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defer buffered.Flush()
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op, err := buffered.ReadString('\n')
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if err != nil {
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return
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}
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// handle operation
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var status *IPCError
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switch op {
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case "set=1\n":
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err = device.IpcSetOperation(buffered.Reader)
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if err != nil && !errors.As(err, &status) {
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// should never happen
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device.log.Error.Println("Invalid UAPI error:", err)
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status = &IPCError{1}
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}
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case "get=1\n":
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err = device.IpcGetOperation(buffered.Writer)
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if err != nil && !errors.As(err, &status) {
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// should never happen
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device.log.Error.Println("Invalid UAPI error:", err)
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status = &IPCError{1}
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}
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default:
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device.log.Error.Println("Invalid UAPI operation:", op)
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return
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}
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// write status
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if status != nil {
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device.log.Error.Println(status)
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fmt.Fprintf(buffered, "errno=%d\n\n", status.ErrorCode())
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} else {
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fmt.Fprintf(buffered, "errno=0\n\n")
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}
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}
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