#!/bin/bash
#Script for cycling through several libertynet accounts trying to conect.
#TODO: Due to a problem with the drivers?, the dongle must be reset between dial in attempts.
#TODO: For now this reset must be done by physically pulling and re-inserting the dongle.
#TODO: But someone smarter than me should figure out how to do this with code.

# TODO: Find a reasonable way to monitor for a successful connection connection.
# TODO: When the connection is successful, start IRC.  This is important because if all accounts are in use
# TODO:   a sms sent to twitter could post a mesage in the #baobab channel to alert those online that someone
# TODO:   is waiting to get online.  For now we just print a reminder to start IRC.
# TODO: Set up the SMS-twitter-IRC alerting system.
# TODO: Another posibility:  The SMS sent by a baobaber waiting for use of a libertynet account would
# TODO:   initiate a disonnect of the person who has been online the longest unless they override the dissconect.

# assign usernames to the array u and passwords to p, numberOfAccts is the number of accounts
numberOfAccts=2
u[0]="username0"    # dummy values were put in to allow for public consumption
p[0]="password0"    # substitute with real usernames and passwords
u[1]="username1"
p[1]="password1"

#This is the config that will be put into /etc/wvdial.conf with the various usernames/passwords
wvdialconf="
[Dialer Defaults]
New PPPD = yes
Modem = /dev/ttyUSB0
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Dial Command = ATDT
Phone = #777
Modem Type = Analog Modem
Baud = 460800
Carrier Check = on
Username = 26u79n
Password = 5vn7drq
Stupid Mode = on
Check Def Route = on
Abort on Busy = off
Abort on No Dialtone = off
Auto Reconnect = off
ISDN = 0
Auto DNS = on
Idle Seconds = 0
Dial Attempts = 1
"

echo "
This script is supposed to facilitate the sharing of several libertynet
accounts among several users. You probably should turn off other network
connecitons before you connect to libertynet. (I always uncheck
'enable wireless' in the system tray.)  Durring this script we will create
new /etc/chap-secrets, /etc/pap-secrets, and /etc/wvdial.conf files.  The
originals will be backed up to /etc/chap-secrets.bak, /etc/pap-secrets.bak,
and /etc/wvdial.conf.bak.

Please, start IRC when you get a successful connection.
"
read -p "Continue? <Y/n> " prompt
if [[ $prompt == "n" || $prompt == "N" || $prompt == "no" || $prompt == "No" || $prompt == "NO" ]]
then
  exit
#~ else
  #~ echo "...continuing..."
fi

sudo modprobe usbserial vendor=0x19d2 product=0xfffe #register the driver?
#echo "...did the modprobe..."

#backup chap-secrets, pap-secrets, and wvdial.conf
#echo "Backing up chap-secrets, pap-secrets, and wvdial.conf..."
sudo mv -f /etc/ppp/pap-secrets /etc/ppp/pap-secrets.bak
sudo mv -f /etc/ppp/chap-secrets /etc/ppp/chap-secrets.bak
sudo mv -f /etc/wvdial.conf /etc/wvdial.conf.bak


#Go through each username and password.
index=0
while true
do
    echo "
If the libertynet dongle is not inserted, insert it now.  If it is, please
remove and re-insert it.  The dongle will be ready to dial once the orange
light has extuingished.  It should take about 20 seconds after it is inserted.
"
    read -p "After the orange light on the dongle has extuingished, press <enter> to continue." prompt

  echo "

Trying to connect with username ${u[$index]} and password ${p[$index]}
"
    #substitute the current username/password into the configuration string and write it to /tmp/wvdial.conf
    echo "$wvdialconf" | sed "s_Password = [^ ]*_Password = ${p[$index]}_" | sed "s_Username = [^ ]*_Username = ${u[$index]}_" > /tmp/wvdial.conf
    #move the tmp config file to the /etc
    sudo mv /tmp/wvdial.conf /etc/wvdial.conf
    #little daemon-like loop that checks the log file to see if we are connected, this is disabled because i couldn't figure out how to kill it gracefully
    #~ while true
    #~ do
        #~ sleep 5
        #~ if grep -q "DNS address" /tmp/libertynet.log #the DNS address is sent to stderr when the connection is successful
            #~ then
                #~ echo "...connected..."
                #~ echo "Be a team player, start IRC and listen for requests to give up your connection from offline baobabers."
                #~ break
            #~ else
                #~ echo "...not connected..."
        #~ fi
    #~ done&
    #the dial/re-dial routine
    while true
    do
        >/tmp/libertynet.log                #initialize the log for each dial attempt
        sudo wvdial 3>&1 1>&2 2>&3 | tee /tmp/libertynet.log  #dial the modem, send stderr to log file and to screen (tee only works on stdout, so we swap stdout and stderr)
        if grep -q "Device or resource busy" /tmp/libertynet.log #this happens if the modem is not yet ready
            then
                echo
                echo "... looks like the modem was not available, is it already in use by another application?..."
                sleep 3
                echo "...re-dialing..."
                echo
        elif grep -q "No such file" /tmp/libertynet.log #this also happens if the modem is not yet ready
            then
                echo
                echo "... wvdial can not see the modem, is the dongle plugged in? ... "
                sleep 3
                echo "...re-dialing..."
                echo
        elif grep -q "NO CARRIER" /tmp/libertynet.log #this happens if the modem fails to find a cell tower
            then
                echo
                echo "...Modem did not succesfully connect to a cell tower, are you getting cell reception? "
                echo "...re-dialing..."
                echo
        elif grep -q "Modem not responding." /tmp/libertynet.log #this happens if the modem is not re-inserted
            then
                echo
                echo "...Looks like the dongle was not reset...."
                echo "...Don't forget to remove and re-insert the dongle when prompted..."
                echo
                break
        else
                echo
                echo "...Looks like that account is already in use...."
                echo
                break
        fi
    done

    #~ if [ $! ] ; then kill $!; fi    # Kill the background daemon-like loop, this seems to give some unwanted output
                                    # but at least the background process does stop.  Disabled, because it was messy.

    let "index += 1"
    if  [ $index == $numberOfAccts ]  #when we've tried all acounts, give the option to quit or start over
    then
        echo
        echo "We have tried all the libertynet accounts. Do you want to start over with the first account or quit?"
        read -p "<S>tart over or <q>uit?" prompt
        if [[ $prompt == "q" || $prompt == "Q" || $prompt == "quit" || $prompt == "Quit" || $prompt == "QUIT" ]]
        then
            exit 0
        else
            let "index=0"
            echo "...starting over with the first username/password..."
        fi
    fi

done