如何測試SSH Server可接受的未經授權的最大連線數?

寫了一個簡單的script如下，去做測試然而目前只支援Class C，可以改善的空間應該還不少。

#!/bin/bash

# Bind IP

read -p "Which interface? [eth0]: " INTERFACE

read -p "Net address: [10.10.10] " NETIP

read -p "Min IP address: [1] " MiIP

read -p "Max IP address:[254] " MaIP

for((i="$MiIP";i<="$MaIP";i++))

do

ip addr add "$NETIP"."$i"/24 dev $INTERFACE 1>/dev/null 2>1

done

echo ""

# Start to test

read -p "Target: [10.10.10.10] " TARGET

i=$MiIP

num=1

echo ""

echo "Preparing for test target: $TARGET"

sleep 5

while true;

do

ssh admin@$TARGET -o StrictHostKeyChecking=no -b "$NETIP"."$i" 1>/dev/null 2>1 &

sleep 1

netstat -an | grep 22 | grep ESTABLISHED | grep "\<$NETIP"."$i\>"

if [ `echo $?` -ne 0 ]; then

num=$(($num-1))

echo "The maximum SSH session of $TARGET is $num"

kill `ps aux | grep "\<22\>" | grep -v grep | grep -v ssh-agent | awk -F" " '{print $2}'` > /dev/null

break

else

echo "SSH session number $num is established!"

i=$(($i+1))

num=$(($num+1))

fi

done

exit