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25 lines
673 B
Go
25 lines
673 B
Go
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build ios || darwin
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package captivedetection
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import (
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"syscall"
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"golang.org/x/sys/unix"
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"tailscale.com/types/logger"
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)
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// setSocketInterfaceIndex sets the IP_BOUND_IF socket option on the given RawConn.
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// This forces the socket to use the given interface.
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func setSocketInterfaceIndex(c syscall.RawConn, ifIndex int, logf logger.Logf) error {
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return c.Control((func(fd uintptr) {
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err := unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_BOUND_IF, ifIndex)
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if err != nil {
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logf("captivedetection: failed to set IP_BOUND_IF (ifIndex=%d): %v", ifIndex, err)
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}
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}))
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}
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