40 lines
544 B
Go
40 lines
544 B
Go
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package server
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import (
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"net"
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"syscall"
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)
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func BindInterface(ip net.IP, port int, dev string) (net.PacketConn, error) {
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if port == 0 {
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port = 67
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}
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udpAddr := &net.UDPAddr{
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IP: ip,
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Port: port,
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}
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conn, err := net.ListenUDP("udp4", udpAddr)
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if err != nil {
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return nil, err
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}
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sysconn, err := conn.SyscallConn()
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if err != nil {
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conn.Close()
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return nil, err
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}
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sysconn.Control(func(fd uintptr) {
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err = syscall.BindToDevice(int(fd), dev)
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})
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if err != nil {
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conn.Close()
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return nil, err
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}
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return conn, nil
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}
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