From 9be87fa5ec89c9e393c9c93b3cb36668c71593d6 Mon Sep 17 00:00:00 2001
From: Will Hawkins <whh8b@obs.cr>
Date: Sat, 4 Jun 2022 21:24:19 -0400
Subject: [Feature] Add conditional compilation support for GetTCPInfo

Now there is functionality for conditionally supporting GetTCPInfo
depending on the platform. If the platform supports it, then the client
can call utilities.GetTCPInfo. In the case that the platform does not
support the GetTCPInfo function call, the result is an error of the type
`NotImplemented`.
---
 utilities/utilities.go | 56 +++++---------------------------------------------
 1 file changed, 5 insertions(+), 51 deletions(-)

(limited to 'utilities/utilities.go')

diff --git a/utilities/utilities.go b/utilities/utilities.go
index e4c8a0d..7e26ab9 100644
--- a/utilities/utilities.go
+++ b/utilities/utilities.go
@@ -18,13 +18,10 @@ import (
 	"fmt"
 	"math"
 	"math/rand"
-	"net"
 	"os"
 	"reflect"
 	"sync/atomic"
 	"time"
-
-	"golang.org/x/sys/unix"
 )
 
 func IsInterfaceNil(ifc interface{}) bool {
@@ -126,53 +123,10 @@ func RandBetween(max int) int {
 	return rand.New(rand.NewSource(int64(time.Now().Nanosecond()))).Int() % max
 }
 
-func GetTCPInfo(connection net.Conn) (*unix.TCPInfo, 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
-	}
+type NotImplemented struct {
+	Functionality string
+}
 
-	var info *unix.TCPInfo = nil
-	rawConn.Control(func(fd uintptr) {
-		info, err = unix.GetsockoptTCPInfo(int(fd), unix.SOL_TCP, unix.TCP_INFO)
-	})
-	return info, err
-}
-
-func PrintTCPInfo(info *unix.TCPInfo) {
-	fmt.Printf("TCPInfo: \n")
-	fmt.Printf("	State: %v\n", info.State)
-	fmt.Printf("	Ca_state: %v\n", info.Ca_state)
-	fmt.Printf("	Retransmits: %v\n", info.Retransmits)
-	fmt.Printf("	Probes: %v\n", info.Probes)
-	fmt.Printf("	Backoff: %v\n", info.Backoff)
-	fmt.Printf("	Options: %v\n", info.Options)
-	fmt.Printf("	Rto: %v\n", info.Rto)
-	fmt.Printf("	Ato: %v\n", info.Ato)
-	fmt.Printf("	Snd_mss: %v\n", info.Snd_mss)
-	fmt.Printf("	Rcv_mss: %v\n", info.Rcv_mss)
-	fmt.Printf("	Unacked: %v\n", info.Unacked)
-	fmt.Printf("	Sacked: %v\n", info.Sacked)
-	fmt.Printf("	Lost: %v\n", info.Lost)
-	fmt.Printf("	Retrans: %v\n", info.Retrans)
-	fmt.Printf("	Fackets: %v\n", info.Fackets)
-	fmt.Printf("	Last_data_sent: %v\n", info.Last_data_sent)
-	fmt.Printf("	Last_ack_sent: %v\n", info.Last_ack_sent)
-	fmt.Printf("	Last_data_recv: %v\n", info.Last_data_recv)
-	fmt.Printf("	Last_ack_recv: %v\n", info.Last_ack_recv)
-	fmt.Printf("	Pmtu: %v\n", info.Pmtu)
-	fmt.Printf("	Rcv_ssthresh: %v\n", info.Rcv_ssthresh)
-	fmt.Printf("	Rtt: %v\n", info.Rtt)
-	fmt.Printf("	Rttvar: %v\n", info.Rttvar)
-	fmt.Printf("	Snd_ssthresh: %v\n", info.Snd_ssthresh)
-	fmt.Printf("	Snd_cwnd: %v\n", info.Snd_cwnd)
-	fmt.Printf("	Advmss: %v\n", info.Advmss)
-	fmt.Printf("	Reordering: %v\n", info.Reordering)
-	fmt.Printf("	Rcv_rtt: %v\n", info.Rcv_rtt)
-	fmt.Printf("	Rcv_space: %v\n", info.Rcv_space)
-	fmt.Printf("	Total_retrans: %v\n", info.Total_retrans)
+func (ni *NotImplemented) Error() string {
+	return fmt.Sprintf("%v not implemented.\n", ni.Functionality)
 }
-- 
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