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#! /bin/sh # Copyright (c) The Exim Maintainers 2023 # Copyright (c) University of Cambridge, 1995 - 2015 # See the file NOTICE for conditions of use and distribution. # SPDX-License-Identifier: GPL-2.0-or-later # This script takes the following command line arguments: # -l dir Log file directory # -k days Number of days to keep the log files # Except when they appear in comments, the following placeholders in this # source are replaced when it is turned into a runnable script: # # CONFIGURE_FILE_USE_NODE # CONFIGURE_FILE_USE_EUID # CONFIGURE_FILE # BIN_DIRECTORY # EXICYCLOG_MAX # COMPRESS_COMMAND # COMPRESS_SUFFIX # CHOWN_COMMAND # CHGRP_COMMAND # CHMOD_COMMAND # TOUCH_COMMAND # MV_COMMAND # RM_COMMAND # This file has been so processed. # This is a shell script for cycling exim main and reject log files. Each time # it is run, the files get "shuffled down" by one, the current one (e.g. # mainlog) becoming mainlog.01, the previous mainlog.01 becoming mainlog.02, # and so on, up to the limit configured here. When the number to keep is # greater than 99 (not common, but some people do it), three digits are used # (e.g. mainlog.001). The same shuffling happens to the reject logs. All # renamed files with numbers greater than 1 are compressed. # This script should be called regularly (e.g. daily) by a root crontab # entry of the form # 1 0 * * * /opt/exim/bin/exicyclog # The following lines are generated from Exim's configuration file when # this source is built into a script, but you can subsequently edit them # without rebuilding things, as long are you are careful not to overwrite # the script in the next Exim rebuild/install. "Keep" is the number of old log # files that are required to be kept. Its value can be overridden by the -k # command line option. "Compress" and "suffix" define your chosen compression # method. The others are provided because the location of certain commands # varies from OS to OS. Sigh. keep=10 compress=/usr/bin/gzip suffix=gz chgrp=look_for_it chmod=look_for_it chown=look_for_it mv=/bin/mv rm=/bin/rm touch=/usr/bin/touch # End of editable lines ######################################################################### # Sort out command line options. while [ $# -gt 0 ] ; do case "$1" in -l) log_file_path=$2 shift ;; -k) keep=$2 shift ;; --version|-v) echo "`basename $0`: $0" echo "build: 4.97.1" exit 0 ;; *) echo "** exicyclog: unknown option $1" exit 1 ;; esac shift done # Some operating systems have different versions in which the commands live # in different places. We have a fudge that will search the usual suspects if # requested. for cmd in chgrp chmod chown mv rm touch; do eval "oldcmd=\$$cmd" if [ "$oldcmd" != "look_for_it" ] ; then continue ; fi newcmd=$cmd for dir in /bin /usr/bin /usr/sbin /usr/etc ; do if [ -f $dir/$cmd ] ; then newcmd=$dir/$cmd break fi done eval $cmd=$newcmd done # See if this installation is using the esoteric "USE_EUID" feature of Exim, # in which it uses the effective user id as a suffix for the configuration file # name. In order for this to work, exicyclog must be run under the appropriate # euid. if [ "" = "yes" ]; then euid=.`id -u` fi # See if this installation is using the esoteric "USE_NODE" feature of Exim, # in which it uses the host's name as a suffix for the configuration file name. if [ "" = "yes" ]; then hostsuffix=.`uname -n` fi # Now find the configuration file name. This has got complicated because the # CONFIGURE_FILE value may now be a list of files. The one that is used is the # first one that exists. Mimic the code in readconf.c by testing first for the # suffixed file in each case. set `awk -F: '{ for (i = 1; i <= NF; i++) print $i }' <<End /etc/exim.conf End ` while [ "$config" = "" -a $# -gt 0 ] ; do if [ -f "$1$euid$hostsuffix" ] ; then config="$1$euid$hostsuffix" elif [ -f "$1$euid" ] ; then config="$1$euid" elif [ -f "$1$hostsuffix" ] ; then config="$1$hostsuffix" elif [ -f "$1" ] ; then config="$1" fi shift done # Determine if the log file path is set, and where the spool directory is. # Search for an exim_path setting in the configure file; otherwise use the bin # directory. Call that version of Exim to find the spool directory and log file # path, unless log_file_path was set above by a command line option. BEWARE: a # tab character is needed in the command below. It has had a nasty tendency to # get lost in the past. Use a variable to hold a space and a tab to keep the # tab in one place. st=' ' exim_path=`grep "^[$st]*exim_path" $config | sed "s/.*=[$st]*//"` if test "$exim_path" = ""; then exim_path=/usr/sbin/exim; fi spool_directory=`$exim_path -C $config -bP spool_directory | sed 's/.*=[ ]*//'` if [ "$log_file_path" = "" ] ; then log_file_path=`$exim_path -C $config -bP log_file_path | sed 's/.*=[ ]*//'` fi # If log_file_path contains only "syslog" then no Exim log files are in use. # We can't cycle anything. Complain and give up. if [ "$log_file_path" = "syslog" ] ; then echo "*** Exim is logging to syslog - no log files to cycle ***" exit 1 fi # Otherwise, remove ":syslog" or "syslog:" (some spaces allowed) and inspect # what remains. The simplistic regex originally used failed when a filename # contained "syslog", so we have to use three less general ones, because sed # doesn't have much power in its regexs. log_file_path=`echo "$log_file_path" | \ sed 's/^ *:\{0,1\} *syslog *:\{0,1\} *//;s/: *syslog *:/:/;s/: *syslog *$//'` # If log_file_path is empty, try and get the compiled in default by using # /dev/null as the configuration file. if [ "$log_file_path" = "" ]; then log_file_path=`$exim_path -C /dev/null -bP log_file_path | sed 's/.*=[ ]*//'` log_file_path=`echo "$log_file_path" | \ sed 's/^ *:\{0,1\} *syslog *:\{0,1\} *//;s/: *syslog *:/:/;s/: *syslog *$//'` fi # If log_file_path is still empty, the logs we are interested in are probably # called "mainlog" and "rejectlog" in the directory called "log" in the spool # directory. Otherwise we fish out the directory from the given path, and also # the names of the logs. if [ "$log_file_path" = "" ]; then logdir=$spool_directory/log mainlog=mainlog rejectlog=rejectlog paniclog=paniclog else logdir=`echo $log_file_path | sed 's?/[^/]*$??'` logbase=`echo $log_file_path | sed 's?^.*/??'` mainlog=`echo $logbase | sed 's/%s/main/'` rejectlog=`echo $logbase | sed 's/%s/reject/'` paniclog=`echo $logbase | sed 's/%s/panic/'` fi # Get into the log directory to do the business. cd $logdir || exit 1 # If there is no main log file, do nothing. if [ ! -f $mainlog ]; then exit; fi # Find out the owner and group of the main log file so that we can re-instate # this on moved and compressed files, since some operating systems may change # things. This is a tedious bit of code, but it should work both in operating # systems where the -l option of ls gives the user and group, and those in which # you need -lg. The condition is that, if the fifth field of the output from # ls consists entirely of digits, then the third and fourth fields are the user # and group. a=`ls -lg $mainlog` b=`ls -l $mainlog` # These statements work fine in the Bourne or Korn shells, but not in Bash. # So for the benefit of systems whose /bin/sh is really Bash, they have been # changed to a messier form. # user=`echo "$a\n$b\n" | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) print $3; }'` # group=`echo "$a\n$b\n" | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) print $4; }'` user=`echo "$a $b " | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) { print $3; exit; } }'` group=`echo "$a $b " | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) { print $4; exit; } }'` # Now do the job. First remove the files that have "fallen off the bottom". # Look for both the compressed and uncompressed forms. if [ $keep -lt 10 ]; then rotation=0$keep; else rotation=$keep; fi; if [ -f $mainlog.$rotation ]; then $rm $mainlog.$rotation; fi; if [ -f $mainlog.$rotation.$suffix ]; then $rm $mainlog.$rotation.$suffix; fi; if [ -f $rejectlog.$rotation ]; then $rm $rejectlog.$rotation; fi; if [ -f $rejectlog.$rotation.$suffix ]; then $rm $rejectlog.$rotation.$suffix; fi; if [ -f $paniclog.$rotation ]; then $rm $paniclog.$rotation; fi; if [ -f $paniclog.$rotation.$suffix ]; then $rm $paniclog.$rotation.$suffix; fi; # Now rename all the previous old files by increasing their numbers by 1. # When the number is less than 10, insert a leading zero. count=$keep if [ $count -lt 10 ]; then countt=0$count; else countt=$count; fi while [ $count -gt 1 ]; do old=`expr -- $count - 1` if [ $keep -gt 99 ]; then if [ $old -lt 10 ]; then oldt=00$old elif [ $old -lt 100 ]; then oldt=0$old else oldt=$old fi else if [ $old -lt 10 ]; then oldt=0$old; else oldt=$old; fi; fi if [ -f $mainlog.$oldt ]; then $mv $mainlog.$oldt $mainlog.$countt elif [ -f $mainlog.$oldt.$suffix ]; then $mv $mainlog.$oldt.$suffix $mainlog.$countt.$suffix fi if [ -f $rejectlog.$oldt ]; then $mv $rejectlog.$oldt $rejectlog.$countt elif [ -f $rejectlog.$oldt.$suffix ]; then $mv $rejectlog.$oldt.$suffix $rejectlog.$countt.$suffix fi if [ -f $paniclog.$oldt ]; then $mv $paniclog.$oldt $paniclog.$countt elif [ -f $paniclog.$oldt.$suffix ]; then $mv $paniclog.$oldt.$suffix $paniclog.$countt.$suffix fi count=$old countt=$oldt done # Now rename the current files as 01 or 001 if keeping more than 99 if [ $keep -gt 99 ]; then first=001; else first=01; fi # Grab our pid ro avoid race in file creation ourpid=$$ if [ -f $mainlog ]; then $mv $mainlog $mainlog.$first $chown $user:$group $mainlog.$first $touch $mainlog.$ourpid $chown $user:$group $mainlog.$ourpid $chmod 640 $mainlog.$ourpid $mv $mainlog.$ourpid $mainlog fi if [ -f $rejectlog ]; then $mv $rejectlog $rejectlog.$first $chown $user:$group $rejectlog.$first $touch $rejectlog.$ourpid $chown $user:$group $rejectlog.$ourpid $chmod 640 $rejectlog.$ourpid $mv $rejectlog.$ourpid $rejectlog fi if [ -f $paniclog ]; then $mv $paniclog $paniclog.$first $chown $user:$group $paniclog.$first $touch $paniclog.$ourpid $chown $user:$group $paniclog.$ourpid $chmod 640 $paniclog.$ourpid $mv $paniclog.$ourpid $paniclog fi # Now scan the (0)02 and later files, compressing where necessary, and # ensuring that their owners and groups are correct. count=2; while [ $count -le $keep ]; do if [ $keep -gt 99 ]; then if [ $count -lt 10 ]; then countt=00$count elif [ $count -lt 100 ]; then countt=0$count else countt=$count fi else if [ $count -lt 10 ]; then countt=0$count; else countt=$count; fi fi if [ -f $mainlog.$countt ]; then $compress $mainlog.$countt; fi if [ -f $mainlog.$countt.$suffix ]; then $chown $user:$group $mainlog.$countt.$suffix fi if [ -f $rejectlog.$countt ]; then $compress $rejectlog.$countt; fi if [ -f $rejectlog.$countt.$suffix ]; then $chown $user:$group $rejectlog.$countt.$suffix fi if [ -f $paniclog.$countt ]; then $compress $paniclog.$countt; fi if [ -f $paniclog.$countt.$suffix ]; then $chown $user:$group $paniclog.$countt.$suffix fi count=`expr -- $count + 1` done # End of exicyclog