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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package util
import (
"syscall"
"golang.org/x/sys/unix"
)
func getConnTCPInfo(raw syscall.RawConn) (*TCPInfo, error) {
var info *unix.TCPConnectionInfo
var getSockoptErr error
err := raw.Control(func(fd uintptr) {
info, getSockoptErr = unix.GetsockoptTCPConnectionInfo(int(fd), unix.IPPROTO_TCP, unix.TCP_CONNECTION_INFO)
})
if err != nil {
return nil, err
}
if getSockoptErr != nil {
return nil, getSockoptErr
}
if info == nil {
return nil, ErrNoTCPInfo
}
return &TCPInfo{
RTT: info.Srtt,
RTTVar: info.Rttvar,
SndMSS: info.Maxseg, // MSS is the same for snd/rcv according bsd/netinet/tcp_usrreq.c
RcvMSS: info.Maxseg,
SndCwnd: info.Snd_cwnd, // Send congestion window
SndWnd: info.Snd_wnd, // Advertised send window
RcvWnd: info.Rcv_wnd, // Advertised recv window
}, nil
}
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