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