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Current File : /proc/thread-self/root/sbin/exicyclog
#! /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=/usr/bin/chgrp
chmod=/usr/bin/chmod
chown=/usr/bin/chown
mv=/usr/bin/mv
rm=/usr/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 $i }' <<End
/etc/exim/exim.conf
End
`
while [ "$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

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