Server version

mdSenderServer

#!/bin/bash

#SERVER FILE

#Copyright 2013 Ricard Solé

#This program is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation, either version 3 of the License, or
#(at your option) any later version.

#This program 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 General Public License for more details.
#You should have received a copy of the GNU General Public License
#along with this program.  If not, see <http://www.gnu.org/licenses/>.

file_send()
{
	while true; do
		nc -vv $targetIP 8081 < $1 2>log
		log=`cat log`
		if echo $log | grep -q "succeeded!" ; then
			echo "Connection established."
			break
		fi  
		echo "Couldn't stablish connection. Retrying."
	done
}

pongfun()
{
	echo "WAITING FOR IP DISH"
	nc -vv -l 8080 > targetIP
	echo "IP HAS BEEN EATEN"
	echo "pong" > pongfile
	echo "WAITING FOR PING"
	nc -vv -l 8080 > pingfile
	pingfile=`cat pingfile`

	if [ "$pingfile" == "ping" ]; then
		echo "PING RECEIVED OK"
		echo "ASSIGNING TARGET IP ADDRESS"
		targetIP=`cat targetIP`
		echo "TARGET IP IS: $targetIP"
		echo "IP HAS BEEN DIGESTED"
	else
		echo "exit 5"
		exit 5
	fi

	if [ "$pingfile" == "ping" ]; then
		echo "SENDING PONG"
		file_send pongfile
		echo "PONG SENT OK"
	else
		echo "Unwanted connection. Exiting."
		exit 4
	fi
}

verifymd5()
{
	#receive md5sum
	nc -vv -l 8080 > md5sumorigin
	md5sumorigin+=(`cat md5sumorigin`)
	sleep $delayserver

	#does md5sum of partial files and compares
	md5sum+=(`cat received.part$i | md5sum | cut -d ' ' -f 1`)

	if [ ! ${md5sumorigin[$i]} -eq ${md5sum[$i]} ]; then
		echo "Error del fichero $i"
		exit 1
	fi
}

sendOK()
{
	echo "SENDING OK"
	echo "OK" > OKfile
	file_send OKfile
	echo "OK SENT"
}

sendKO()
{
	echo "SENDING KO"
	echo "KO" > KOfile
	file_send < KOfile
	echo "KO SENT"
}

#Displays GNU GPL
echo ""
echo "===================================================================="
echo "||SERVER.sh Copyright (C) 2013 Ricard Solé                        ||"
echo "||This program comes with ABSOLUTELY NO WARRANTY;                 ||"
echo "||This is free software, and you are welcome to redistribute it   ||"
echo "||under certain conditions.                                       ||"
echo "===================================================================="
echo ""

#sends pong
pongfun

#receives global md5sum
nc -vv -l 8080 > md5sumreceived
md5sumreceived=`cat md5sumreceived`
sleep $delayserver

i=1
testend=""

#receives total # of files
nc -vv -l 8080 > totalfiles
totalfiles=`cat totalfiles`
sleep $delayserver

while true; do

	#receives file
	nc -vv -l 8080 > received.part$i
	echo "FILE RECEIVE OK"
	testend=`cat received.part$i`
	if [ "$testend" == "FINISH" ];then
		echo "ENDCOMMAND RECEIVED"
		rm received.part$i
		echo "EXITING"
		break
	fi
	echo "Recibiendo archivo $i/$totalfiles"
	sleep $delayserver

	#checks sync
	nc -vv -l 8080 > checknum
	checknumber=`cat checknum`
	sleep $delayserver
	echo "ASSIGN CHECKNUM OK"

	#exits if fails sync
	#if [ ! "$checknumber" = "$i" ]; then
	#	echo "Error de sincronización."
	#	exit 1
	#fi

	#receive md5sum
	nc -vv -l 8080 >> md5sumorigin
	md5sumclient=`cat md5sumorigin | tail -1`
	sleep $delayserver
	echo "RECEIVE INDIVIDUAL MD5SUM OK"

	#does md5sum of partial files and compares
	md5sumserver=`cat received.part$i | md5sum | cut -d ' ' -f 1`

	if [ ! "$md5sumclient" = "$md5sumserver" ]; then
		echo "Error del fichero $i."
		echo "Abortando conexión."
		sendKO 
		rm md5sumreceived totalfiles received.part* checknum md5sumorigin
		exit 1
	fi
	echo "MD5SUM COMPARISON OK"
	sendOK

	echo "i = $i"
	i=$((i + 1))

done

echo "Transferencia finalizada."

echo "¿Qué nombre quieres ponerle al archivo?"
read original

#joins parts
cat received.part* > $original

#checks md5sum total
newmd5=`cat $original | md5sum | cut -d ' ' -f 1`
amountreceived=`ls received.part* | wc -l`

if [ $totalfiles == $amountreceived ]; then
	if [ $newmd5 == $md5sumreceived ]; then
		echo "Transferencia satisfactoria."
	else
		echo "Los MD5 no concuerdan. Archivo corrupto."
	fi
else
	echo "Faltan archivos."
fi

rm md5sumreceived totalfiles received.part* checknum md5sumorigin log KOfile OKfile pingfile pinglog pongfile targetIP
echo "archivos temporales borrados"