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package rewrite
import (
"encoding/binary"
"fmt"
"net"
"strconv"
)
// ipToWire writes IP address to wire/binary format, 4 or 16 bytes depends on IPV4 or IPV6.
func ipToWire(family int, ipAddr string) ([]byte, error) {
switch family {
case 1:
return net.ParseIP(ipAddr).To4(), nil
case 2:
return net.ParseIP(ipAddr).To16(), nil
}
return nil, fmt.Errorf("invalid IP address family (i.e. version) %d", family)
}
// uint16ToWire writes unit16 to wire/binary format
func uint16ToWire(data uint16) []byte {
buf := make([]byte, 2)
binary.BigEndian.PutUint16(buf, data)
return buf
}
// portToWire writes port to wire/binary format, 2 bytes
func portToWire(portStr string) ([]byte, error) {
port, err := strconv.ParseUint(portStr, 10, 16)
if err != nil {
return nil, err
}
return uint16ToWire(uint16(port)), nil
}
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