#!/bin/bash 

#Script, proveryaushii, podnyalos li soedinenie
WTIMEOUT=120 #Maksimalnoe vremya ojhidania 's
PEERFILE="/etc/ppp/peers/" #imya peer-file
ADDR="" #adres dlya ping
PING=0

#Proveryaem parametry
if [ -z "$1" ]; then
    echo "USE myconn <peer file> [-p] [address]";
    echo "Options:";
    echo "<peer file> - file in /etc/ppp/peers";
    echo "[-p] - use ping check";
    echo "[address] - address to ping, default use gateway address";
    exit 2;
fi

echo "Connecting to "$1;

if [ "$2" = "-p" ]; then #esli vtoroi parametr skripta="-p"
    #budem pingovat
    PING=1; #ustanavlivaem flag vkluchajushii proverku
    echo -n "Ping test address..."
    if [ -n "$3" ]; then #proveryaem zadan li adres
	ADDR=$3; #esli da, sohranyaem v peremennuju
	echo $ADDR;
    else #inache budet ispolzovan adres shluza
	echo "Gateway address.";
    fi
else
    echo "No ping test"
fi


PEERFILE="$PEERFILE""$1";
#Proveryaem, est li file
if [ ! -e "$PEERFILE" ]; then
    echo "File "$PEERFILE" not found";
    exit 1;
fi

#Proveryaem, ne soedineno li uzhe 
#(v spiske processov d.b. 2 stroki pppd call NNN, esli soedineno)
TMPGREP=`ps ax|grep "pppd call $1" -c`
if [ $TMPGREP -gt 1 ]; then
    echo "ERROR: $1 already connected"
    exit 2;
fi


#Ishem pervyi svobodnyi nomer ppp soedinenia (eto nado dalshe)
FIRSTFREE=0;
ifconfig ppp$FIRSTFREE >/dev/null 2>/dev/null
while [ $? -eq 0 ]; do
    let "FIRSTFREE = FIRSTFREE+1";
    ifconfig ppp$FIRSTFREE >/dev/null 2>/dev/null
done


#ishem parameter unit i udalyaem lishnee
PPPUNIT=`grep "unit" $PEERFILE`;
PPPUNIT=${PPPUNIT//unit/}
PPPUNIT=${PPPUNIT// /}

if [ ! -n "$PPPUNIT" ]; then	
    #Esli parametr unit ne ukazan, sistema ispolzuet pervy svobodny
    #pri podnyatii soedinenia
    
    echo "Parameter 'unit' not found, system use first free ($FIRSTFREE)";
    PPPUNIT=FIRSTFREE;
else
    #Esli ukazan, to nado proverit' ne zanyat li on
    ifconfig ppp$PPPUNIT >/dev/null 2>/dev/null
    if [ $? -eq 0 ]; then		#zanyat
	echo "WARNING! Unit #$PPPUNIT is already in use, system use 
	first free ($FIRSTFREE)";
	PPPUNIT=FIRSTFREE;
    else			#svoboden
	echo "Unit $PPPUNIT is free. OK."
    fi
fi

#ustanavlivaem soedinenie
pppd call $1

CONNECTED=0 #flag, podnyalos li soedinenie

echo -n "Wait ("$WTIMEOUT" secounds): "
while [ $WTIMEOUT -ge 0 ]; do
     echo -n ".";
     sleep 1
    #***************************************************
    TMPGREP=`ifconfig ppp$PPPUNIT 2>/dev/null|grep "destination"` #pytaemsa poluchit strochku s ip shluza
    if [ -n "$TMPGREP" ]; then #esli strochka est'
	TMPGREP=`echo $TMPGREP|awk ' {print $6} '` #izvlekaem awk IP shluza
	if [ -n "$TMPGREP" ];then #esli adres poluchen
	    if [ $PING -eq 1 ]; then #esli nado pingovat'
		if [ -z "$ADDR" ]; then #adres ne zadan, ispolzuem shluz
        	    ADDR=$TMPGREP
    		fi

		ping -c 1 -I ppp$PPPUNIT $ADDR >/dev/null 2>/dev/null #pytaemsya propingovat shluz
    		if [ $? -eq 0 ]; then # esli poluchilos
        	    CONNECTED=1 #ustanavlivaem flag soedinenija
        	    break #i preryvaem cykl. Ura!!
    		fi
    	    else #esli pingovat' ne nado
        	CONNECTED=1 #ustanavlivaem flag soedinenija
        	break #i preryvaem cykl. Ura!!
    	    fi
    	fi
    fi
    #***************************************************
     let "WTIMEOUT=WTIMEOUT-1";
done

# chtob sledujushee soobshenie pechatalos so sledujushei stroki
echo

# Proveryaem, soedinilis ili net i sootvetstvenno soobshaem
if [ $CONNECTED -eq 0 ]
then
     echo "Connection timeout over :("
else
     echo "Connected sucsesseful!"
fi