clash/component/process/process_darwin.go
2023-01-14 16:16:59 +08:00

130 lines
2.7 KiB
Go

package process
import (
"encoding/binary"
"net/netip"
"strconv"
"strings"
"syscall"
"unsafe"
"golang.org/x/sys/unix"
)
const (
procpidpathinfo = 0xb
procpidpathinfosize = 1024
proccallnumpidinfo = 0x2
)
var structSize = func() int {
value, _ := syscall.Sysctl("kern.osrelease")
major, _, _ := strings.Cut(value, ".")
n, _ := strconv.ParseInt(major, 10, 64)
switch true {
case n >= 22:
return 408
default:
// from darwin-xnu/bsd/netinet/in_pcblist.c:get_pcblist_n
// size/offset are round up (aligned) to 8 bytes in darwin
// rup8(sizeof(xinpcb_n)) + rup8(sizeof(xsocket_n)) +
// 2 * rup8(sizeof(xsockbuf_n)) + rup8(sizeof(xsockstat_n))
return 384
}
}()
func findProcessName(network string, ip netip.Addr, port int) (uint32, string, error) {
var spath string
switch network {
case TCP:
spath = "net.inet.tcp.pcblist_n"
case UDP:
spath = "net.inet.udp.pcblist_n"
default:
return 0, "", ErrInvalidNetwork
}
isIPv4 := ip.Is4()
value, err := syscall.Sysctl(spath)
if err != nil {
return 0, "", err
}
buf := []byte(value)
itemSize := structSize
if network == TCP {
// rup8(sizeof(xtcpcb_n))
itemSize += 208
}
var fallbackUDPProcess string
// skip the first xinpgen(24 bytes) block
for i := 24; i+itemSize <= len(buf); i += itemSize {
// offset of xinpcb_n and xsocket_n
inp, so := i, i+104
srcPort := binary.BigEndian.Uint16(buf[inp+18 : inp+20])
if uint16(port) != srcPort {
continue
}
// xinpcb_n.inp_vflag
flag := buf[inp+44]
var (
srcIP netip.Addr
srcIsIPv4 bool
)
switch {
case flag&0x1 > 0 && isIPv4:
// ipv4
srcIP, _ = netip.AddrFromSlice(buf[inp+76 : inp+80])
srcIsIPv4 = true
case flag&0x2 > 0 && !isIPv4:
// ipv6
srcIP, _ = netip.AddrFromSlice(buf[inp+64 : inp+80])
default:
continue
}
if ip == srcIP {
// xsocket_n.so_last_pid
pid := readNativeUint32(buf[so+68 : so+72])
pp, err := getExecPathFromPID(pid)
return 0, pp, err
}
// udp packet connection may be not equal with srcIP
if network == UDP && srcIP.IsUnspecified() && isIPv4 == srcIsIPv4 {
fallbackUDPProcess, _ = getExecPathFromPID(readNativeUint32(buf[so+68 : so+72]))
}
}
if network == UDP && fallbackUDPProcess != "" {
return 0, fallbackUDPProcess, nil
}
return 0, "", ErrNotFound
}
func getExecPathFromPID(pid uint32) (string, error) {
buf := make([]byte, procpidpathinfosize)
_, _, errno := syscall.Syscall6(
syscall.SYS_PROC_INFO,
proccallnumpidinfo,
uintptr(pid),
procpidpathinfo,
0,
uintptr(unsafe.Pointer(&buf[0])),
procpidpathinfosize)
if errno != 0 {
return "", errno
}
return unix.ByteSliceToString(buf), nil
}
func readNativeUint32(b []byte) uint32 {
return *(*uint32)(unsafe.Pointer(&b[0]))
}