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//go:build darwin
// +build darwin
package extendedstats
import (
"crypto/tls"
"fmt"
"net"
"github.com/network-quality/goresponsiveness/utilities"
"golang.org/x/sys/unix"
)
type ExtendedStats struct {
Maxseg uint64
MaxSendMss uint64
MaxRecvMss uint64
TotalRetransmissions uint64
totalSent uint64
TotalReorderings uint64
AverageRtt float64
rtt_measurements uint64
total_rtt float64
RetransmitRatio float64
}
func ExtendedStatsAvailable() bool {
return true
}
func (es *ExtendedStats) IncorporateConnectionStats(rawConn net.Conn) error {
tlsConn, ok := rawConn.(*tls.Conn)
if !ok {
return fmt.Errorf(
"OOPS: Could not get the TCP info for the connection (not a TLS connection)",
)
}
tcpConn, ok := tlsConn.NetConn().(*net.TCPConn)
if !ok {
return fmt.Errorf(
"OOPS: Could not get the TCP info for the connection (not a TCP connection)",
)
}
if info, err := getTCPConnectionInfo(tcpConn); err != nil {
return fmt.Errorf("OOPS: Could not get the TCP info for the connection: %v", err)
} else {
es.Maxseg = utilities.Max(es.Maxseg, uint64(info.Maxseg))
es.TotalReorderings += info.Rxoutoforderbytes
es.TotalRetransmissions += info.Txretransmitbytes
es.totalSent += info.Txbytes
es.total_rtt += float64(info.Srtt)
es.rtt_measurements += 1
es.AverageRtt = es.total_rtt / float64(es.rtt_measurements)
es.RetransmitRatio = (float64(es.TotalRetransmissions) / float64(es.totalSent)) * 100.0
}
return nil
}
func (es *ExtendedStats) Repr() string {
return fmt.Sprintf(`Extended Statistics:
Maximum Segment Size: %v
Total Bytes Retransmitted: %v
Retransmission Ratio: %.2f%%
Total Bytes Reordered: %v
Average RTT: %v
`, es.Maxseg, es.TotalRetransmissions, es.RetransmitRatio, es.TotalReorderings, es.AverageRtt)
}
func getTCPConnectionInfo(connection net.Conn) (*unix.TCPConnectionInfo, error) {
tcpConn, ok := connection.(*net.TCPConn)
if !ok {
return nil, fmt.Errorf("connection is not a net.TCPConn")
}
rawConn, err := tcpConn.SyscallConn()
if err != nil {
return nil, err
}
var info *unix.TCPConnectionInfo = nil
rawConn.Control(func(fd uintptr) {
info, err = unix.GetsockoptTCPConnectionInfo(
int(fd),
unix.IPPROTO_TCP,
unix.TCP_CONNECTION_INFO,
)
})
return info, err
}
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