Linux Training

#!/bin/bash
# $Id: chkmail,v 1.224 2016/02/08 18:59:01 fulford Exp $
# $Source: /src/merlin/usr/local/etc/RCS/chkmail,v $
# $Revision: 1.224 $
# Author C W Fulford.
# Copyright 2014-2015 (c) C W Fulford.
# Licensed for public use under the LGPL, .
# For assistance contact fulford@fulford.net 0709 229 5385
########################################################################
cmd=`basename $0`
[ $cmd == "debrianail" ] && expunge=":"
tmp=/var/tmp/$cmd.$$
case $cmd in
	chkmail) syntax="$cmd [-a <addr>] [-b <mbox> ] [-c <config>] [-d] [-i <imap_server>] [-L] [-l] [-m <#max>] [-n] [-P <password>] [-p <port> [-u <username>] [-v] [<config_id>|ALL]|[-V]";;
	debrianail) syntax="$cmd [-c <config>] [-d] [-i <imap_server>] [-l] [-m <mbox>] [-n] [-P <password>] [-p <port> [-v] [-w <#>] <mail_address>|[-V]";;
esac
while [ $# -gt 0 ] ;do
	case $1 in 
		-a) [ $cmd = "debrianail" ]&&{
			echo $syntax>&2;
			exit 1
		    }
		    echo "addr=$2">>$tmp;shift 2;;
		-b) echo "mbox=$2">>$tmp;shift 2;;
		-c) config=$2;shift;;
		-d) debug=:;set -x;shift;;
		-i) echo "srvr=$2">$tmp;shift 2;;
		-L) [ $cmd = "debrianail" ]&&{
			echo $syntax>&2;
			exit 1
		    }
		    list=":";shift;;
		-l) log=:;shift;;				
		-m) echo "max=$2">>$tmp;shift 2;;
		-n) notice=:;shift;;
		-P) echo "passwd=pasSword4u
		-p) port=$2>>$tmp;shift 2;;
		-u) echo "user=$2">>$tmp;shift 2;;
		-v) verbose=:;nl="\\n";shift;;
		-V) echo "$cmd $Revision: 1.224 $ $Date: 2016/02/08 18:59:01 $"|awk '{print $1,$3,$6}';exit;;  
		-*) echo "syntax: $syntax">&2;exit 1;;
	         *) idlist=$1;shift;;
	esac
done
config=${config:="/usr/local/etc/chkmail.cf"}


[ -n $idlist ] ||{ echo "syntax: $syntax" >&2;exit 1;}
[ $idlist == ALL -a $cmd == "chkmail" ]&&{
	[ "$verbose" ] && echo $cmd: checking all ids in $config >&2
	idlist=`sed <$config -ne "/^[^ 	#@]*:/s/:/ /p"`
}
[ -n "$idlist" ] ||{ echo "syntax: $syntax" >&2;exit 1;}
cnt_msgs=/usr/local/etc/msg_cnt
lst_mbxs=/usr/local/etc/lst_mbxs
del_msgs=/usr/local/etc/msg_del


for id in $idlist ;do
	unset addr alert archives afolders max mbox po srvr user
	[ -r "$config" -a -n "$id" -a $id != "ALL" ] && {
		if grep "$id:">/dev/null $config;then
		    eval `sed -ne '/^'$id':/,/^$/{/^[ 	][^#]/p}' $config`
		else
		    echo "$cmd: $id not found in $config" >&2
		    exit 1
		fi
	}
	[ -f $tmp ] && . $tmp
	case $port in
		22) proto=ssh;;
		143) proto=imap;;
		993) proto=ssl;;
		"") port=22;proto=ssh;
		    [ "$verbose" ] && echo "$cmd: using port 22." >&2;;
		*) echo "$cmd: proceedure for $port not known." >&2;exit;;
	esac
	proto=${proto:-"ssl"}


	# set defaults if nothing found
	addr=${addr:-"`id -nu`@`hostname -d`"}
	alert=${alert:-$addr}
	max=${max:-100}
	mbox=${mbox:-"INBOX"}
	po=`echo $addr|awk -F@ '{split($2,a,".");print a[1]}'`
	srvr=${srvr:-"imap.`hostname -d`"}
	user=${user:-$addr}
	
	if [ "$expunge" ];then
	  [ "$verbose" ] &&{
		echo "$cmd: Warning messages in excess of $max will be deleted"
	  }
	fi
	if [ "$list" ];then
		expect -f $lst_mbxs $srvr $proto $addr $mbox "$passwd"|
		awk '/^* LIST/{gsub(/"/,"",$5);print $5}'
		exit
	fi


	#Check if host name resolves
	getent hosts $srvr >/dev/null||{
		echo -e "${nl}$cmd: Can't find host \"$srvr\".">&2
		exit 1
	}

	[ "$mbox" == "$folders" ] && folders=""

	nc -zw 2 $srvr $port </dev/null || {
       		echo -e "${nl}Port $port unavailable on $srvr ($user).">&2
		exit 1
	}
	for n in "$folders" ;do
		echo $folders|egrep -wq '.Archive' && archives=:
	done
		
	if [ "$archives" ];then
		ay=2012
		while  [ $ay -lt  `date "+%Y"` ];do
			afolders="$afolders INBOX.Archive.$ay"
		       	ay=`expr $ay + 1`
		done	
		folders=`echo $folders|sed -e "s/\.Archive/$afolders/"` 
	fi
	for m in $mbox $folders ;do
		#[ "$verbose" ] && printf "%s%8s%s""chkmail:",${user},"'s",$m,"on",$srvr
		[ "$verbose" ] && printf "%s%-39s%-18s%s" "chkmail:" "$user's " $m " on $srvr:"

		if [ $port -eq 22 ];then
			mdomain=`echo $addr|awk -F@ '{print $2}'`
			vuser=`echo $addr|awk -F@ '{print $1}'`
			f=`echo $m|awk '{sub(/INBOX/,"");print}'`	
			mdir=/var/qmail/mailnames/$mdomain/$vuser/Maildir/$f
			total=`ssh $srvr "sudo find $mdir/{cur,new} -type f" 2>/dev/null|wc -l`
		else
  			suser=`echo $user|sed -ne 's/^\(.*\)@.*/\1/p'`
			total=`expect -f $cnt_msgs $srvr $proto  $addr $m "$passwd"|\
				awk '/EXISTS/{print $2}'`
		fi
		if [ -n "$total" ];then
			if [ "$verbose" ]; then 
				#printf "%6d\t$m\n" $total
				printf "%6d\n" $total
			elif [ ${total:-0} -ge $max -a $m == "INBOX" ];then
				echo  "$cmd: Warning: ${user}'s $m on $srvr has $total messages" >&2
			fi
		       	[ "$log" ] && {
			  	logger -p mail.notice -t $cmd "$total messages in $user $m at $srvr."
			}

			
			[ ${total:-0} -gt "$max" -a "$notice" ] && {
				fname=`echo $alert|awk -F@ '{split($1,a,".");print a[1]}'`
				fname=`echo $fname|awk -F@ '{sub(".",substr((toupper($1)),1,1),$1);print}'`
		
				mailx -s "Your $mbox at $po" $alert <<- .
					$fname

				You have $total messages in your mail folder $m
				at $po.
		
				Please delete or archive old messages.

				If messages need to be kept on-line move them to
				other folders.

				Try to keep your inbox to under $max messages.
	
				Clifford W Fulford
				Mail Administrator
		.
			}
			if [ "$expunge" ];then
			   if [ $total -lt $max ];then
				echo "$cmd: Total messages ($total) less then maximum ($max)">&2
				exit 1	
			   else
			   	del=`expr $total - $max`
			   	expect -f $del_msgs $srvr $proto  $addr $m "$passwd" $del
			   	total=`expr $total - $del`
			     	[ "$log" ] &&{
			       		logger -p mail.notice -t $cmd "$del messages deleted for $user $m at $srvr."
			  		logger -p mail.notice -t $cmd "$total messages in $user $m at $srvr."
		      	}
			      	[ $verbose ] &&{
			      		s=s;[ $del -eq 1 ] && s=""
			      		echo "$cmd: $del message$s deleted for $user $m at $srvr."
					echo "$cmd: $total message$s remaining for $user $m at $srvr."
			      	}
			     fi
			fi
		else
			[ "$verbose" ] && echo "$cmd: $user $mbx not found."
			[ "$log" ] && {
				logger -p mail.notice -t $cmd "$user $m at $srvr. Not found!"
			}

		fi
	done
done
[ -f "$tmp" ] && rm $tmp
######################################################################
# This program is free software: you can redistribute it and or      #
# modify it under the terms of the Lesser 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.                       #
#                                                                    # 
# A copy of the Lesser GNU General Public License and the GNU        #
# General Public License is available at                             #
# <http://www.gnu.org/licenses/>.                                    #
######################################################################