add e2e test tools

sshpiperd/e2e/docker-compose.yml

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+version: '3'
+
+services:
+  client:
+    image: rastasheep/ubuntu-sshd
+    volumes:
+      - workingdir:/workingdir
+      - localkey:/local
+      - host1ssh:/host1
+      - names:/names
+      - ./test.sh:/test.sh
+    links:
+      - "piper:piper"
+    command:
+      - "/bin/bash"
+      - "/test.sh"
+  piper:
+    environment:
+      - "SSHPIPERD_NO_CHECK_PERM=true"
+    build: ../..
+    links:
+      - "host1:host1"
+      - "host2:host2"
+    volumes:
+      - workingdir:/var/sshpiper
+  host1:
+    image: rastasheep/ubuntu-sshd
+    volumes:
+      - host1ssh:/root/.ssh
+      - names:/names
+  host2:
+    image: rastasheep/ubuntu-sshd
+    volumes:
+      - names:/names
+
+volumes:
+  workingdir:
+  localkey:
+  host1ssh:
+  names:

sshpiperd/e2e/test.sh

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+#!/bin/bash
+
+apt-get update
+apt-get install -y sshpass 
+
+mkdir -p /local
+mkdir -p /workingdir/host{1,2}
+
+ssh-keygen -N '' -f /local/id_rsa
+ssh-keygen -N '' -f /workingdir/host1/id_rsa
+
+/bin/cp /local/id_rsa.pub /workingdir/host1/authorized_keys
+/bin/cp /workingdir/host1/id_rsa.pub /host1/authorized_keys
+
+
+echo "root@host1" > /workingdir/host1/sshpiper_upstream
+echo "root@host2" > /workingdir/host2/sshpiper_upstream
+
+
+
+fail="\033[0;31mFAIL\033[0m"
+succ="\033[0;32mSUCC\033[0m"
+
+while true; do
+
+    casename="host1 with public key: "
+    rnd=`head -c 6 /dev/urandom | base64`
+    echo $rnd > /names/host1
+    t=`ssh host1@piper -p 2222 -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i /local/id_rsa cat /names/host1`
+
+    if [ $t != $rnd ];then
+        echo -e $casename $fail
+    else
+        echo -e $casename $succ
+    fi
+
+    casename="host2 with password"
+    rnd=`head -c 6 /dev/urandom | base64`
+    echo $rnd > /names/host2
+    t=`sshpass -p root ssh host2@piper -p 2222 -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null cat /names/host2`
+
+    if [ $t != $rnd ];then
+        echo -e $casename $fail
+    else
+        echo -e $casename $succ
+    fi
+
+    sleep 1
+done