#!/bin/bash
#
#  Script Name: ipcheck
#
#  Homepage:  http://www.scrounge.org/ipwatch/
#
#  Email:  ipwatch@scrounge.org
#
#  Version:  1.1
#
#  Date:     04/16/2000
#
#  Requires ipwatch.sh, 0.01 Beta 09, or later
#
#  Copyright (C) 1999, 2000  Bruce Buhler, Wayne Larmon
#
#  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.
#
#  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.
#
#  Purpose: Checks the funcionality of ipwatch.sh,
#
#  Usage:  Run ipwatch.sh with appropriate command line arguments.
#
#          -c      Displays status on console
#          -c -m   Sends status message to address defined with MAILTO
#          -c -l   Writes status to log file
#          -c -n   Suppresses display on console
#          -c -v   Display all variable settings
#          -c -s   Show ipwatch log file
#
# Can also specify options verbosely:
#
#          -c or --check
#          -m or --mail
#          -l or --log
#          -n or --noecho
#          -v or --variable
#          -s or --show
#
#          Configuration is in ipwatch.sh.  ipwatch.sh and
#          ipcheck.sh must be in the same directory.
#
#          See http://www.scrounge.org/ipwatch/ for full instructions
#          on how to install and configure this script.


MSGFILE="/tmp/ipcheck.msg"

# Get command line parameters
CHKMAIL=""; CHKECHO="1"; CHKLOG=""; CHKINIT=""; CHKVAR=""; CHKSHOW=""

while [ ! -z "$1" ]; do
   case "$1" in
     -m | --mail)
       CHKMAIL="1"
       ;;
     -l | --log)
       CHKLOG="1"
       ;;
     -n | --noecho)
       CHKECHO=""
       ;;
     -v | --variable)
       CHKVAR="1"
       ;;
     -s | --show)
       CHKSHOW="1"
       ;;
     *)
       echo -e "\a\n$1 is an invalid argument."
       ;;
    esac  
    shift
done

# We must have been called from ipwatch.sh
# MAILTO won't be defined if we weren't called from ipwatch.sh
if [ -n "$MAILTO" ]; then
    SUBJECT="$MACHIDENT IPWatch check:"

    # Is ipwatch.sh configured at all?
    if [ $SERVER != "xxx.xxx.xxx.xxx" ]; then   

       # At least somewhat.  Now let's try seeing if we have connectivity.
       if isnetup; then

           # Yes! We are connected.
           # isnetup is a function that is defined in ipwatch.sh
	   IPADDR=`ifconfig | grep -A 4 $EXTIF | awk '/inet/ { print $2 }'\
		| sed -e s/addr://`
	   SUBJECT="$SUBJECT Network is up"
           echo -e "\nThe Network is up." >> $MSGFILE

           # IPFILE is our previous "current" IP.  This is tested against
           # the IP that ifconfig reports to see if our IP has changed.
           if [ ! -f "$IPFILE" ]; then
              echo $IPADDR > $IPFILE
              SUBJECT="$SUBJECT (Created IP file.)"
              echo -e "\nIPFILE doesn't exist.  Creating it now.\n" >> $MSGFILE
           else
              # The getoldip function is defined in ipwatch.sh
              getoldip
              if [ "$OLDIP" = "$IPADDR" ]; then
	         SUBJECT="$SUBJECT and $IPADDR is unchanged"
                 echo -e "Current IP $IPADDR is unchanged.\n" >> $MSGFILE
              else
                 SUBJECT="$SUBJECT and $IPPADDR is different from $OLDIP"
                 echo -e "Current IP $IPADDR has changed.  (Old IP was $OLDIP)\n" >> $MSGFILE
                 echo -e "\nRun 'ipwatch.sh' with no command arguments to reinitialize." >> $MSGFILE
              fi
           fi
       else
            SUBJECT="$SUBJECT Network is down"
            echo -e "\nThe network is down." >> $MSGFILE
            echo -e "\nRun 'ipwatch.sh' with no command arguments to restart it." >> $MSGFILE
       fi # if isnetup?

    else
       echo -e "\n Cannot check network because SERVER is not configured.\n" >> $MSGFILE
    fi # if [ SERVER != "xxx.xxx.xxx.xxx"]
    

    # Display the ipwatch.sh defined variables
    if [ -n "$CHKVAR" ]; then
        echo -e "EXTIF      = $EXTIF (is our Internet connection.)" >> $MSGFILE
        echo -e "SERVER     = $SERVER (is what we test to see if the network is up.)" >> $MSGFILE

        if [ "$SERVER" = "xxx.xxx.xxx.xxx" ]; then
          echo "SERVER is not configured!  This is bad." >> $MSGFILE
        fi

        if [ -n "$FIREWALL" ]; then 
          echo -e "FIREWALL   = $FIREWALL (is how we restart our firewall.)" >> $MSGFILE
        else
          echo -e "FIREWALL is not set, so we won't be restarting the firewall." >> $MSGFILE
        fi  

        if [ "$UPDATEHOST" = "yes" ]; then
          echo -e "UPDATEHOST = $UPDATEHOST  We will be updating the hostname." >> $MSGFILE
        else
          echo -e "UPDATEHOST = $UPDATEHOST  We will not be updating the hostname." >> $MSGFILE
        fi

        echo -e "TIMELIMIT  = $TIMELIMIT seconds." >> $MSGFILE
        echo -e "LOGFILE    = $LOGFILE (ipwatch.sh and ipcheck.ch log file location.)" >> $MSGFILE
        echo -e "MAILTO     = $MAILTO (status messages will be mailed here.)" >> $MSGFILE
     
        # Now do some validity checking for Dynamic DNS stuff
        case "$DYNDNS" in
          yi)
           echo -e "Using yi.org for Dynamic DNS.\n" >> $MSGFILE
           ;;
          homepc)
           echo -e "Using homepc.com for Dynamic DNS.\n" >> $MSGFILE
           ;;
          dyndns_com)
           echo -e "Using dyndns.com for Dynamic DNS.\n" >> $MSGFILE
           ;;
          dyndns_org)
           echo -e "Using dyndns.org for Dynamic DNS." >> $MSGFILE
           if [ -z "$DYNHOSTNAME" ]; then
             echo -e "DYNHOSTNAME is not configured.  It must be.\n" >> $MSGFILE
           else
             echo -e "DYNHOSTNAME is $DYNHOSTNAME\n" >> $MSGFILE
           fi
           ;;
          justLinux)
           echo -e "Using justlinux.com for Dynamic DNS." >> $MSGFILE
           if [ -z "$DNSID" ]; then
             echo -e "DNSID is not configured.  It must be.\n" >> $MSGFILE
           else
             echo -e "JustLinux DNSID is $DNSID\n" >> $MSGFILE
           fi
           ;;
          dhs)
           echo -e "Using dhs.org for Dynamic DNS." >> $MSGFILE
           if [ -z "$DYNHOSTNAME" ]; then
             echo -e "DYNHOSTNAME is not configured.  It must be.\n" >> $MSGFILE
           else
             echo -e "DYNHOSTNAME is $DYNHOSTNAME\n" >> $MSGFILE
           fi
           ;;
          *)
           echo -e "You do not have a Dynamic DNS service defined.\n" >> $MSGFILE
           ;;
        esac
        if [ -n "$DYNDNS" ]; then
	   if [ -z "$USER_ID" ] || [ -z "$PASSWORD" ]; then 
             echo -e "USER_ID and PASSWORD need to be filled out.\n" >> $MSGFILE
           fi
        fi

        echo -e "Current IP is located in $IPFILE.  (Currently is `cat $IPFILE`.)" >>$MSGFILE

    fi # if $CHKVAR

    if [ -f "/var/lock/subsys/ipwatch" ]; then
       echo -e "ipwatch.sh \"Lock\" file (/var/lock/subsys/ipwatch) exists.  Should it?" >> $MSGFILE
       echo -e "Type 'ps ax | grep ipwatch.sh' to see if other ipwatch processes" >> $MSGFILE
       echo -e "are running.\n" >> $MSGFILE
    fi

    if [ -n "$CHKSHOW" ]; then
       echo -e "\nLog file is $LOGFILE.  Last 10 lines:\n`tail -n 10 $LOGFILE`\n" >> $MSGFILE
    fi

    if [ ! -z "$CHKMAIL" ] && isnetup; then
	mail -s "$SUBJECT" $MAILTO < $MSGFILE
    fi

    if [ ! -z "$CHKECHO" ]; then       
         cat "$MSGFILE"
    fi

    if [ ! -z "$CHKLOG" ]; then
       echo "`timestamp` $SUBJECT" >> $LOGFILE
    fi
 
    rm -f $MSGFILE
    exit
else
    echo -e "\a\nYou can't run ipcheck.sh all by itself."
    echo -e "You must run ipwatch.sh with the following parameters:\n"

    echo -e "-c     Displays status on the console."
    echo -e "-c -m  Mails status to MAILTO address."
    echo -e "-c -l  Writes status to ipwatch log file."
    echo -e "-c -n  Suppresses display on console."
    echo -e "-c -v  Displays variable assignments."
    echo -e "-c -s  Shows ipwatch log file.\n"

    echo -e "Can also use verbose options:\n"
    echo "-c or --check, -m or --mail, -l or --log, -n or --noecho, -v or --variable,"
    echo "-s or --show."
    echo ""
fi

#
# End of script
#