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We can use the TCP_CONNECTION_INFO getsockopt() on Darwin to get OS-collected tx/rx bytes for TCP sockets. Since this API is not available for UDP sockets (or on Linux/Android), we can't rely on it for actual stats gathering. However, we can use it to validate the stats that we collect ourselves using read/write hooks, so that we can be more confident in them. We do need additional hooks from the Go standard library (added in tailscale/go#59) to be able to collect them. Updates tailscale/corp#9230 Updates #3363 Signed-off-by: Mihai Parparita <mihai@tailscale.com>
31 lines
555 B
Go
31 lines
555 B
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build tailscale_go && (darwin || ios)
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package sockstats
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import (
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"syscall"
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"golang.org/x/sys/unix"
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)
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func init() {
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tcpConnStats = darwinTcpConnStats
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}
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func darwinTcpConnStats(c syscall.RawConn) (tx, rx uint64) {
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c.Control(func(fd uintptr) {
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if rawInfo, err := unix.GetsockoptTCPConnectionInfo(
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int(fd),
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unix.IPPROTO_TCP,
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unix.TCP_CONNECTION_INFO,
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); err == nil {
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tx = uint64(rawInfo.Txbytes)
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rx = uint64(rawInfo.Rxbytes)
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}
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})
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return
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}
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