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Feature: add PROCESS-NAME rule for linux (#822)
This commit is contained in:
parent
20eff200b1
commit
4f73410618
3 changed files with 293 additions and 1 deletions
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@ -8,6 +8,7 @@ var (
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errPayload = errors.New("payload error")
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errParams = errors.New("params error")
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ErrPlatformNotSupport = errors.New("not support on this platform")
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ErrInvalidNetwork = errors.New("invalid network")
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noResolve = "no-resolve"
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)
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291
rules/process_linux.go
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291
rules/process_linux.go
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@ -0,0 +1,291 @@
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package rules
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"io"
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"io/ioutil"
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"net"
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"path"
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"path/filepath"
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"strconv"
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"strings"
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"syscall"
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"unsafe"
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"github.com/Dreamacro/clash/common/cache"
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"github.com/Dreamacro/clash/common/pool"
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C "github.com/Dreamacro/clash/constant"
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"github.com/Dreamacro/clash/log"
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)
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// from https://github.com/vishvananda/netlink/blob/bca67dfc8220b44ef582c9da4e9172bf1c9ec973/nl/nl_linux.go#L52-L62
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func init() {
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var x uint32 = 0x01020304
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if *(*byte)(unsafe.Pointer(&x)) == 0x01 {
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nativeEndian = binary.BigEndian
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} else {
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nativeEndian = binary.LittleEndian
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}
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}
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type SocketResolver func(metadata *C.Metadata) (inode, uid int, err error)
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type ProcessNameResolver func(inode, uid int) (name string, err error)
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// export for android
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var (
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DefaultSocketResolver SocketResolver = resolveSocketByNetlink
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DefaultProcessNameResolver ProcessNameResolver = resolveProcessNameByProcSeach
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)
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type Process struct {
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adapter string
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process string
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}
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func (p *Process) RuleType() C.RuleType {
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return C.Process
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}
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func (p *Process) Match(metadata *C.Metadata) bool {
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key := fmt.Sprintf("%s:%s:%s", metadata.NetWork.String(), metadata.SrcIP.String(), metadata.SrcPort)
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cached, hit := processCache.Get(key)
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if !hit {
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processName, err := resolveProcessName(metadata)
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if err != nil {
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log.Debugln("[%s] Resolve process of %s failure: %s", C.Process.String(), key, err.Error())
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}
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processCache.Set(key, processName)
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cached = processName
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}
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return strings.EqualFold(cached.(string), p.process)
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}
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func (p *Process) Adapter() string {
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return p.adapter
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}
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func (p *Process) Payload() string {
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return p.process
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}
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func (p *Process) NoResolveIP() bool {
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return true
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}
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func NewProcess(process string, adapter string) (*Process, error) {
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return &Process{
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adapter: adapter,
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process: process,
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}, nil
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}
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const (
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sizeOfSocketDiagRequest = syscall.SizeofNlMsghdr + 8 + 48
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socketDiagByFamily = 20
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pathProc = "/proc"
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)
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var nativeEndian binary.ByteOrder = binary.LittleEndian
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var processCache = cache.NewLRUCache(cache.WithAge(2), cache.WithSize(64))
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func resolveProcessName(metadata *C.Metadata) (string, error) {
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inode, uid, err := DefaultSocketResolver(metadata)
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if err != nil {
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return "", err
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}
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return DefaultProcessNameResolver(inode, uid)
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}
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func resolveSocketByNetlink(metadata *C.Metadata) (int, int, error) {
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var family byte
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var protocol byte
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switch metadata.NetWork {
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case C.TCP:
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protocol = syscall.IPPROTO_TCP
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case C.UDP:
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protocol = syscall.IPPROTO_UDP
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default:
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return 0, 0, ErrInvalidNetwork
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}
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if metadata.SrcIP.To4() != nil {
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family = syscall.AF_INET
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} else {
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family = syscall.AF_INET6
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}
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srcPort, err := strconv.Atoi(metadata.SrcPort)
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if err != nil {
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return 0, 0, err
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}
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req := packSocketDiagRequest(family, protocol, metadata.SrcIP, uint16(srcPort))
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socket, err := syscall.Socket(syscall.AF_NETLINK, syscall.SOCK_DGRAM, syscall.NETLINK_INET_DIAG)
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if err != nil {
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return 0, 0, err
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}
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defer syscall.Close(socket)
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syscall.SetNonblock(socket, true)
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syscall.SetsockoptTimeval(socket, syscall.SOL_SOCKET, syscall.SO_SNDTIMEO, &syscall.Timeval{Usec: 50})
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syscall.SetsockoptTimeval(socket, syscall.SOL_SOCKET, syscall.SO_RCVTIMEO, &syscall.Timeval{Usec: 50})
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if err := syscall.Connect(socket, &syscall.SockaddrNetlink{
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Family: syscall.AF_NETLINK,
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Pad: 0,
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Pid: 0,
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Groups: 0,
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}); err != nil {
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return 0, 0, err
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}
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if _, err := syscall.Write(socket, req); err != nil {
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return 0, 0, err
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}
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rb := pool.Get(pool.RelayBufferSize)
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defer pool.Put(rb)
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n, err := syscall.Read(socket, rb)
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if err != nil {
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return 0, 0, err
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}
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messages, err := syscall.ParseNetlinkMessage(rb[:n])
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if err != nil {
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return 0, 0, err
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} else if len(messages) == 0 {
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return 0, 0, io.ErrUnexpectedEOF
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}
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message := messages[0]
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if message.Header.Type&syscall.NLMSG_ERROR != 0 {
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return 0, 0, syscall.ESRCH
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}
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uid, inode := unpackSocketDiagResponse(&messages[0])
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return int(uid), int(inode), nil
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}
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func packSocketDiagRequest(family, protocol byte, source net.IP, sourcePort uint16) []byte {
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s := make([]byte, 16)
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if v4 := source.To4(); v4 != nil {
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copy(s, v4)
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} else {
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copy(s, source)
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}
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buf := make([]byte, sizeOfSocketDiagRequest)
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nativeEndian.PutUint32(buf[0:4], sizeOfSocketDiagRequest)
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nativeEndian.PutUint16(buf[4:6], socketDiagByFamily)
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nativeEndian.PutUint16(buf[6:8], syscall.NLM_F_REQUEST|syscall.NLM_F_DUMP)
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nativeEndian.PutUint32(buf[8:12], 0)
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nativeEndian.PutUint32(buf[12:16], 0)
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buf[16] = family
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buf[17] = protocol
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buf[18] = 0
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buf[19] = 0
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nativeEndian.PutUint32(buf[20:24], 0xFFFFFFFF)
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binary.BigEndian.PutUint16(buf[24:26], sourcePort)
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binary.BigEndian.PutUint16(buf[26:28], 0)
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copy(buf[28:44], s)
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copy(buf[44:60], net.IPv6zero)
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nativeEndian.PutUint32(buf[60:64], 0)
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nativeEndian.PutUint64(buf[64:72], 0xFFFFFFFFFFFFFFFF)
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return buf
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}
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func unpackSocketDiagResponse(msg *syscall.NetlinkMessage) (inode, uid uint32) {
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if len(msg.Data) < 72 {
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return 0, 0
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}
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data := msg.Data
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uid = nativeEndian.Uint32(data[64:68])
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inode = nativeEndian.Uint32(data[68:72])
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return
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}
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func resolveProcessNameByProcSeach(inode, _ int) (string, error) {
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files, err := ioutil.ReadDir(pathProc)
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if err != nil {
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return "", err
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}
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buffer := make([]byte, syscall.PathMax)
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socket := []byte(fmt.Sprintf("socket:[%d]", inode))
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for _, f := range files {
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if !isPid(f.Name()) {
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continue
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}
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processPath := path.Join(pathProc, f.Name())
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fdPath := path.Join(processPath, "fd")
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fds, err := ioutil.ReadDir(fdPath)
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if err != nil {
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continue
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}
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for _, fd := range fds {
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n, err := syscall.Readlink(path.Join(fdPath, fd.Name()), buffer)
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if err != nil {
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continue
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}
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if bytes.Compare(buffer[:n], socket) == 0 {
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cmdline, err := ioutil.ReadFile(path.Join(processPath, "cmdline"))
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if err != nil {
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return "", err
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}
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return splitCmdline(cmdline), nil
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}
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}
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}
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return "", syscall.ESRCH
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}
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func splitCmdline(cmdline []byte) string {
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indexOfEndOfString := len(cmdline)
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for i, c := range cmdline {
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if c == 0 {
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indexOfEndOfString = i
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break
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}
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}
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return filepath.Base(string(cmdline[:indexOfEndOfString]))
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}
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func isPid(s string) bool {
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for _, s := range s {
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if s < '0' || s > '9' {
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return false
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}
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}
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return true
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}
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@ -1,4 +1,4 @@
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// +build !darwin
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// +build !darwin,!linux
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package rules
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