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126 Zeilen
2.8 KiB
Go
126 Zeilen
2.8 KiB
Go
package util
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import (
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"crypto/rand"
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"encoding/base32"
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"github.com/google/gopacket"
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"github.com/google/gopacket/layers"
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"github.com/google/gopacket/pcapgo"
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log "github.com/sirupsen/logrus"
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"hash/adler32"
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"io/ioutil"
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"net"
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"os"
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"strconv"
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"strings"
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"time"
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)
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// WritePcap writes the provided data to a given pcap file
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func WritePcap(file string, data []byte) {
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f, err := os.Create(file)
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if err != nil {
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log.Errorf("Error writing pcap file %s", file)
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}
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defer f.Close()
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r, err := pcapgo.NewNgWriter(f, layers.LinkTypeEthernet)
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if err != nil {
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log.Errorf("Error writing pcap file %s", file)
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}
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defer r.Flush()
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ci := gopacket.CaptureInfo{
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Timestamp: time.Now(),
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CaptureLength: len(data),
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Length: len(data),
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}
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err = r.WritePacket(ci, data)
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}
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// WriteBinary writes the provided data to a given binary file
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func WriteBinary(file string, data []byte) {
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if err := ioutil.WriteFile(file, data, 0644); err != nil {
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log.Errorf("Error writing binary file %s", file)
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}
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}
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func WritePIDFile(filename string) {
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if filename == "" {
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return
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}
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if err := ioutil.WriteFile(filename, []byte(strconv.Itoa(os.Getpid()) + "\n"), 0644); err != nil {
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log.Errorf("Error writing PID file %s", filename)
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}
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}
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func GenerateMac(customMAC string) net.HardwareAddr {
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if customMAC != "" {
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ret, _ := net.ParseMAC(customMAC)
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return ret
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}
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buf := make([]byte, 6)
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var mac net.HardwareAddr
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if _, err := rand.Read(buf); err != nil {
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log.Error("Error generating random mac")
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ret, _ := net.ParseMAC("52:54:00:12:34:aa")
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return ret
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}
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// Set local bit, ensure unicast address
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buf[0] = (buf[0] | 2) & 0xfe
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mac = append(mac, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5])
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return mac
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}
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func GenerateXID() []byte {
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buf := make([]byte, 4)
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if _, err := rand.Read(buf); err != nil {
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log.Error("Error generating random xid")
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return []byte{36, 23, 250, 224} // chosen by fair dice roll
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// guaranteed to be random --> https://xkcd.com/221/
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}
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return buf
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}
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func GenerateUId(path string) string {
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adl := adler32.Checksum([]byte(path))
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byt := make([]byte, 4)
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for i := uint32(0); i < 4; i++ {
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byt[i] = byte((adl >> (8 * i)) & 0xff)
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}
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b32 := base32.StdEncoding.EncodeToString(byt)
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return strings.ReplaceAll(b32, "=", "")
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}
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// If is a helper type to form expressive ternary expressions being the
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// concatenation of a type conversion and a method call such as:
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//
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// i := If(cond).Int(a, b)
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//
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// For details, see https://stackoverflow.com/a/59375088/1705598
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type If bool
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// If returns a if c is true, b otherwise.
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func (c If) If(a, b interface{}) interface{} {
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if c {
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return a
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}
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return b
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}
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// MAC returns a if c is true, b otherwise.
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func (c If) MAC(a, b net.HardwareAddr) net.HardwareAddr {
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if c {
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return a
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}
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return b
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}
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// IP returns a if c is true, b otherwise.
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func (c If) IP(a, b net.IP) net.IP {
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if c {
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return a
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}
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return b
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} |