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