clash/rules/process_windows.go

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package rules
import (
"errors"
"fmt"
"net"
"path/filepath"
"strconv"
"strings"
"sync"
"syscall"
"unsafe"
"github.com/Dreamacro/clash/common/cache"
C "github.com/Dreamacro/clash/constant"
"github.com/Dreamacro/clash/log"
"golang.org/x/sys/windows"
)
const (
tcpTableFunc = "GetExtendedTcpTable"
tcpTablePidConn = 4
udpTableFunc = "GetExtendedUdpTable"
udpTablePid = 1
queryProcNameFunc = "QueryFullProcessImageNameW"
)
var (
processCache = cache.NewLRUCache(cache.WithAge(2), cache.WithSize(64))
errNotFound = errors.New("process not found")
matchMeta = func(p *Process, m *C.Metadata) bool { return false }
getExTcpTable uintptr
getExUdpTable uintptr
queryProcName uintptr
once sync.Once
)
func initWin32API() error {
h, err := windows.LoadLibrary("iphlpapi.dll")
if err != nil {
return fmt.Errorf("LoadLibrary iphlpapi.dll failed: %s", err.Error())
}
getExTcpTable, err = windows.GetProcAddress(h, tcpTableFunc)
if err != nil {
return fmt.Errorf("GetProcAddress of %s failed: %s", tcpTableFunc, err.Error())
}
getExUdpTable, err = windows.GetProcAddress(h, udpTableFunc)
if err != nil {
return fmt.Errorf("GetProcAddress of %s failed: %s", udpTableFunc, err.Error())
}
h, err = windows.LoadLibrary("kernel32.dll")
if err != nil {
return fmt.Errorf("LoadLibrary kernel32.dll failed: %s", err.Error())
}
queryProcName, err = windows.GetProcAddress(h, queryProcNameFunc)
if err != nil {
return fmt.Errorf("GetProcAddress of %s failed: %s", queryProcNameFunc, err.Error())
}
return nil
}
type Process struct {
adapter string
process string
}
func (p *Process) RuleType() C.RuleType {
return C.Process
}
func (p *Process) Adapter() string {
return p.adapter
}
func (p *Process) Payload() string {
return p.process
}
func (p *Process) ShouldResolveIP() bool {
return false
}
func match(p *Process, metadata *C.Metadata) bool {
key := fmt.Sprintf("%s:%s:%s", metadata.NetWork.String(), metadata.SrcIP.String(), metadata.SrcPort)
cached, hit := processCache.Get(key)
if !hit {
processName, err := resolveProcessName(metadata)
if err != nil {
log.Debugln("[%s] Resolve process of %s failed: %s", C.Process.String(), key, err.Error())
}
processCache.Set(key, processName)
cached = processName
}
return strings.EqualFold(cached.(string), p.process)
}
func (p *Process) Match(metadata *C.Metadata) bool {
return matchMeta(p, metadata)
}
func NewProcess(process string, adapter string) (*Process, error) {
once.Do(func() {
err := initWin32API()
if err != nil {
log.Errorln("Initialize PROCESS-NAME failed: %s", err.Error())
log.Warnln("All PROCESS-NAMES rules will be skiped")
return
}
matchMeta = match
})
return &Process{
adapter: adapter,
process: process,
}, nil
}
func resolveProcessName(metadata *C.Metadata) (string, error) {
ip := metadata.SrcIP
family := windows.AF_INET
if ip.To4() == nil {
family = windows.AF_INET6
}
var class int
var fn uintptr
switch metadata.NetWork {
case C.TCP:
fn = getExTcpTable
class = tcpTablePidConn
case C.UDP:
fn = getExUdpTable
class = udpTablePid
default:
return "", ErrInvalidNetwork
}
srcPort, err := strconv.Atoi(metadata.SrcPort)
if err != nil {
return "", err
}
buf, err := getTransportTable(fn, family, class)
if err != nil {
return "", err
}
s := newSearcher(family == windows.AF_INET, metadata.NetWork == C.TCP)
pid, err := s.Search(buf, ip, uint16(srcPort))
if err != nil {
return "", err
}
return getExecPathFromPID(pid)
}
type searcher struct {
itemSize int
port int
ip int
ipSize int
pid int
tcpState int
}
func (s *searcher) Search(b []byte, ip net.IP, port uint16) (uint32, error) {
n := int(readNativeUint32(b[:4]))
itemSize := s.itemSize
for i := 0; i < n; i++ {
row := b[4+itemSize*i : 4+itemSize*(i+1)]
if s.tcpState >= 0 {
tcpState := readNativeUint32(row[s.tcpState : s.tcpState+4])
// MIB_TCP_STATE_ESTAB, only check established connections for TCP
if tcpState != 5 {
continue
}
}
// according to MSDN, only the lower 16 bits of dwLocalPort are used and the port number is in network endian.
// this field can be illustrated as follows depends on different machine endianess:
// little endian: [ MSB LSB 0 0 ] interpret as native uint32 is ((LSB<<8)|MSB)
// big endian: [ 0 0 MSB LSB ] interpret as native uint32 is ((MSB<<8)|LSB)
// so we need an syscall.Ntohs on the lower 16 bits after read the port as native uint32
srcPort := syscall.Ntohs(uint16(readNativeUint32(row[s.port : s.port+4])))
if srcPort != port {
continue
}
srcIP := net.IP(row[s.ip : s.ip+s.ipSize])
if !ip.Equal(srcIP) {
continue
}
pid := readNativeUint32(row[s.pid : s.pid+4])
return pid, nil
}
return 0, errNotFound
}
func newSearcher(isV4, isTCP bool) *searcher {
var itemSize, port, ip, ipSize, pid int
tcpState := -1
switch {
case isV4 && isTCP:
// struct MIB_TCPROW_OWNER_PID
itemSize, port, ip, ipSize, pid, tcpState = 24, 8, 4, 4, 20, 0
case isV4 && !isTCP:
// struct MIB_UDPROW_OWNER_PID
itemSize, port, ip, ipSize, pid = 12, 4, 0, 4, 8
case !isV4 && isTCP:
// struct MIB_TCP6ROW_OWNER_PID
itemSize, port, ip, ipSize, pid, tcpState = 56, 20, 0, 16, 52, 48
case !isV4 && !isTCP:
// struct MIB_UDP6ROW_OWNER_PID
itemSize, port, ip, ipSize, pid = 28, 20, 0, 16, 24
}
return &searcher{
itemSize: itemSize,
port: port,
ip: ip,
ipSize: ipSize,
pid: pid,
tcpState: tcpState,
}
}
func getTransportTable(fn uintptr, family int, class int) ([]byte, error) {
for size, buf := uint32(8), make([]byte, 8); ; {
ptr := unsafe.Pointer(&buf[0])
err, _, _ := syscall.Syscall6(fn, 6, uintptr(ptr), uintptr(unsafe.Pointer(&size)), 0, uintptr(family), uintptr(class), 0)
switch err {
case 0:
return buf, nil
case uintptr(syscall.ERROR_INSUFFICIENT_BUFFER):
buf = make([]byte, size)
default:
return nil, fmt.Errorf("syscall error: %d", err)
}
}
}
func readNativeUint32(b []byte) uint32 {
return *(*uint32)(unsafe.Pointer(&b[0]))
}
func getExecPathFromPID(pid uint32) (string, error) {
// kernel process starts with a colon in order to distinguish with normal processes
switch pid {
case 0:
// reserved pid for system idle process
return ":System Idle Process", nil
case 4:
// reserved pid for windows kernel image
return ":System", nil
}
h, err := windows.OpenProcess(windows.PROCESS_QUERY_LIMITED_INFORMATION, false, pid)
if err != nil {
return "", err
}
defer windows.CloseHandle(h)
buf := make([]uint16, syscall.MAX_LONG_PATH)
size := uint32(len(buf))
r1, _, err := syscall.Syscall6(
queryProcName, 4,
uintptr(h),
uintptr(1),
uintptr(unsafe.Pointer(&buf[0])),
uintptr(unsafe.Pointer(&size)),
0, 0)
if r1 == 0 {
return "", err
}
return filepath.Base(syscall.UTF16ToString(buf[:size])), nil
}