src/src/exicyclog.src

   1 #! /bin/sh
   2
   3 # Copyright (c) University of Cambridge, 1995 - 2007
   4 # See the file NOTICE for conditions of use and distribution.
   5
   6 # This script takes the following command line arguments:
   7 # -l dir        Log file directory
   8 # -k days       Number of days to keep the log files
   9
  10 # Except when they appear in comments, the following placeholders in this
  11 # source are replaced when it is turned into a runnable script:
  12 #
  13 # CONFIGURE_FILE_USE_NODE
  14 # CONFIGURE_FILE_USE_EUID
  15 # CONFIGURE_FILE
  16 # BIN_DIRECTORY
  17 # EXICYCLOG_MAX
  18 # COMPRESS_COMMAND
  19 # COMPRESS_SUFFIX
  20 # CHOWN_COMMAND
  21 # CHGRP_COMMAND
  22 # CHMOD_COMMAND
  23 # TOUCH_COMMAND
  24 # MV_COMMAND
  25 # RM_COMMAND
  26
  27 # PROCESSED_FLAG
  28
  29 # This is a shell script for cycling exim main and reject log files. Each time
  30 # it is run, the files get "shuffled down" by one, the current one (e.g.
  31 # mainlog) becoming mainlog.01, the previous mainlog.01 becoming mainlog.02,
  32 # and so on, up to the limit configured here. When the number to keep is
  33 # greater than 99 (not common, but some people do it), three digits are used
  34 # (e.g. mainlog.001). The same shuffling happens to the reject logs. All
  35 # renamed files with numbers greater than 1 are compressed.
  36
  37 # This script should be called regularly (e.g. daily) by a root crontab
  38 # entry of the form
  39
  40 # 1 0 * * *   /opt/exim/bin/exicyclog
  41
  42 # The following lines are generated from Exim's configuration file when
  43 # this source is built into a script, but you can subsequently edit them
  44 # without rebuilding things, as long are you are careful not to overwrite
  45 # the script in the next Exim rebuild/install. "Keep" is the number of old log
  46 # files that are required to be kept. Its value can be overridden by the -k
  47 # command line option. "Compress" and "suffix" define your chosen compression
  48 # method. The others are provided because the location of certain commands
  49 # varies from OS to OS. Sigh.
  50
  51 keep=EXICYCLOG_MAX
  52 compress=COMPRESS_COMMAND
  53 suffix=COMPRESS_SUFFIX
  54
  55 chgrp=CHGRP_COMMAND
  56 chmod=CHMOD_COMMAND
  57 chown=CHOWN_COMMAND
  58 mv=MV_COMMAND
  59 rm=RM_COMMAND
  60 touch=TOUCH_COMMAND
  61
  62 # End of editable lines
  63 #########################################################################
  64
  65 # Sort out command line options.
  66
  67 while [ $# -gt 0 ] ; do
  68   case "$1" in
  69   -l) log_file_path=$2
  70       shift
  71       ;;
  72   -k) keep=$2
  73       shift
  74       ;;
  75    *) echo "** exicyclog: unknown option $1"
  76       exit 1
  77       ;;
  78    esac
  79    shift
  80 done
  81
  82 # Some operating systems have different versions in which the commands live
  83 # in different places. We have a fudge that will search the usual suspects if
  84 # requested.
  85
  86 for cmd in chgrp chmod chown mv rm touch; do
  87   eval "oldcmd=\$$cmd"
  88   if [ "$oldcmd" != "look_for_it" ] ; then continue ; fi
  89   newcmd=$cmd
  90   for dir in /bin /usr/bin /usr/sbin /usr/etc ; do
  91     if [ -f $dir/$cmd ] ; then
  92       newcmd=$dir/$cmd
  93       break
  94     fi
  95   done
  96   eval $cmd=$newcmd
  97 done
  98
  99 # See if this installation is using the esoteric "USE_EUID" feature of Exim,
 100 # in which it uses the effective user id as a suffix for the configuration file
 101 # name. In order for this to work, exicyclog must be run under the appropriate
 102 # euid.
 103
 104 if [ "CONFIGURE_FILE_USE_EUID" = "yes" ]; then
 105   euid=.`id -u`
 106 fi
 107
 108 # See if this installation is using the esoteric "USE_NODE" feature of Exim,
 109 # in which it uses the host's name as a suffix for the configuration file name.
 110
 111 if [ "CONFIGURE_FILE_USE_NODE" = "yes" ]; then
 112   hostsuffix=.`uname -n`
 113 fi
 114
 115 # Now find the configuration file name. This has got complicated because the
 116 # CONFIGURE_FILE value may now be a list of files. The one that is used is the
 117 # first one that exists. Mimic the code in readconf.c by testing first for the
 118 # suffixed file in each case.
 119
 120 set `awk -F: '{ for (i = 1; i <= NF; i++) print $i }' <<End
 121 CONFIGURE_FILE
 122 End
 123 `
 124 while [ "$config" = "" -a $# -gt 0 ] ; do
 125   if [ -f "$1$euid$hostsuffix" ] ; then
 126     config="$1$euid$hostsuffix"
 127   elif [ -f "$1$euid" ] ; then
 128     config="$1$euid"
 129   elif [ -f "$1$hostsuffix" ] ; then
 130     config="$1$hostsuffix"
 131   elif [ -f "$1" ] ; then
 132     config="$1"
 133   fi
 134   shift
 135 done
 136
 137 # Determine if the log file path is set, and where the spool directory is.
 138 # Search for an exim_path setting in the configure file; otherwise use the bin
 139 # directory. Call that version of Exim to find the spool directory and log file
 140 # path, unless log_file_path was set above by a command line option. BEWARE: a
 141 # tab character is needed in the command below. It has had a nasty tendency to
 142 # get lost in the past. Use a variable to hold a space and a tab to keep the
 143 # tab in one place.
 144
 145 st='     '
 146 exim_path=`grep "^[$st]*exim_path" $config | sed "s/.*=[$st]*//"`
 147 if test "$exim_path" = ""; then exim_path=BIN_DIRECTORY/exim; fi
 148
 149 spool_directory=`$exim_path -C $config -bP spool_directory | sed 's/.*=[  ]*//'`
 150
 151 if [ "$log_file_path" = "" ] ; then
 152   log_file_path=`$exim_path -C $config -bP log_file_path | sed 's/.*=[  ]*//'`
 153 fi
 154
 155 # If log_file_path contains only "syslog" then no Exim log files are in use.
 156 # We can't cycle anything. Complain and give up.
 157
 158 if [ "$log_file_path" = "syslog" ] ; then
 159   echo "*** Exim is logging to syslog - no log files to cycle ***"
 160   exit 1
 161 fi
 162
 163 # Otherwise, remove ":syslog" or "syslog:" (some spaces allowed) and inspect
 164 # what remains. The simplistic regex originally used failed when a filename
 165 # contained "syslog", so we have to use three less general ones, because sed
 166 # doesn't have much power in its regexs.
 167
 168 log_file_path=`echo "$log_file_path" | \
 169   sed 's/^ *:\{0,1\} *syslog *:\{0,1\} *//;s/: *syslog *:/:/;s/: *syslog *$//'`
 170
 171 # If log_file_path is empty, try and get the compiled in default by using
 172 # /dev/null as the configuration file.
 173
 174 if [ "$log_file_path" = "" ]; then
 175   log_file_path=`$exim_path -C /dev/null -bP log_file_path | sed 's/.*=[  ]*//'`
 176   log_file_path=`echo "$log_file_path" | \
 177     sed 's/^ *:\{0,1\} *syslog *:\{0,1\} *//;s/: *syslog *:/:/;s/: *syslog *$//'`
 178 fi
 179
 180 # If log_file_path is still empty, the logs we are interested in are probably
 181 # called "mainlog" and "rejectlog" in the directory called "log" in the spool
 182 # directory. Otherwise we fish out the directory from the given path, and also
 183 # the names of the logs.
 184
 185 if [ "$log_file_path" = "" ]; then
 186   logdir=$spool_directory/log
 187   mainlog=mainlog
 188   rejectlog=rejectlog
 189   paniclog=paniclog
 190 else
 191   logdir=`echo $log_file_path | sed 's?/[^/]*$??'`
 192   logbase=`echo $log_file_path | sed 's?^.*/??'`
 193   mainlog=`echo $logbase | sed 's/%s/main/'`
 194   rejectlog=`echo $logbase | sed 's/%s/reject/'`
 195   paniclog=`echo $logbase | sed 's/%s/panic/'`
 196 fi
 197
 198 # Get into the log directory to do the business.
 199
 200 cd $logdir || exit 1
 201
 202 # If there is no main log file, do nothing.
 203
 204 if [ ! -f $mainlog ]; then exit; fi
 205
 206 # Find out the owner and group of the main log file so that we can re-instate
 207 # this on moved and compressed files, since some operating systems may change
 208 # things. This is a tedious bit of code, but it should work both in operating
 209 # systems where the -l option of ls gives the user and group, and those in which
 210 # you need -lg. The condition is that, if the fifth field of the output from
 211 # ls consists entirely of digits, then the third and fourth fields are the user
 212 # and group.
 213
 214 a=`ls -lg $mainlog`
 215 b=`ls -l  $mainlog`
 216
 217 # These statements work fine in the Bourne or Korn shells, but not in Bash.
 218 # So for the benefit of systems whose /bin/sh is really Bash, they have been
 219 # changed to a messier form.
 220
 221 # user=`echo "$a\n$b\n" | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) print $3; }'`
 222 # group=`echo "$a\n$b\n" | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) print $4; }'`
 223
 224 user=`echo "$a
 225 $b
 226 " | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) { print $3; exit; } }'`
 227
 228 group=`echo "$a
 229 $b
 230 " | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) { print $4; exit; } }'`
 231
 232 # Now do the job. First remove the files that have "fallen off the bottom".
 233 # Look for both the compressed and uncompressed forms.
 234
 235 if [ $keep -lt 10 ]; then keept=0$keep; else keept=$keep; fi;
 236
 237 if [ -f $mainlog.$keept ]; then $rm $mainlog.$keept; fi;
 238 if [ -f $mainlog.$keept.$suffix ]; then $rm $mainlog.$keept.$suffix; fi;
 239
 240 if [ -f $rejectlog.$keept ]; then $rm $rejectlog.$keept; fi;
 241 if [ -f $rejectlog.$keept.$suffix ]; then $rm $rejectlog.$keept.$suffix; fi;
 242
 243 if [ -f $paniclog.$keept ]; then $rm $paniclog.$keept; fi;
 244 if [ -f $paniclog.$keept.$suffix ]; then $rm $paniclog.$keept.$suffix; fi;
 245
 246 # Now rename all the previous old files by increasing their numbers by 1.
 247 # When the number is less than 10, insert a leading zero.
 248
 249 count=$keep
 250 if [ $count -lt 10 ]; then countt=0$count; else countt=$count; fi
 251
 252 while [ $count -gt 1 ]; do
 253   old=`expr -- $count - 1`
 254   if [ $keep -gt 99 ]; then
 255     if   [ $old -lt 10 ]; then oldt=00$old
 256     elif [ $old -lt 100 ]; then oldt=0$old
 257     else oldt=$old
 258     fi
 259   else
 260     if [ $old -lt 10 ]; then oldt=0$old; else oldt=$old; fi;
 261   fi
 262   if [ -f $mainlog.$oldt ]; then
 263     $mv $mainlog.$oldt $mainlog.$countt
 264   elif [ -f $mainlog.$oldt.$suffix ]; then
 265     $mv $mainlog.$oldt.$suffix $mainlog.$countt.$suffix
 266   fi
 267   if [ -f $rejectlog.$oldt ]; then
 268     $mv $rejectlog.$oldt $rejectlog.$countt
 269   elif [ -f $rejectlog.$oldt.$suffix ]; then
 270     $mv $rejectlog.$oldt.$suffix $rejectlog.$countt.$suffix
 271   fi
 272   if [ -f $paniclog.$oldt ]; then
 273     $mv $paniclog.$oldt $paniclog.$countt
 274   elif [ -f $paniclog.$oldt.$suffix ]; then
 275     $mv $paniclog.$oldt.$suffix $paniclog.$countt.$suffix
 276   fi
 277   count=$old
 278   countt=$oldt
 279 done
 280
 281 # Now rename the current files as 01 or 001 if keeping more than 99
 282
 283 if [ $keep -gt 99 ]; then first=001; else first=01; fi
 284
 285 if [ -f $mainlog ]; then
 286   $mv $mainlog $mainlog.$first
 287   $chown $user:$group $mainlog.$first
 288   $touch $mainlog
 289   $chown $user:$group $mainlog
 290   $chmod 640 $mainlog
 291 fi
 292
 293 if [ -f $rejectlog ]; then
 294   $mv $rejectlog $rejectlog.$first
 295   $chown $user:$group $rejectlog.$first
 296   $touch $rejectlog
 297   $chown $user:$group $rejectlog
 298   $chmod 640 $rejectlog
 299 fi
 300
 301 if [ -f $paniclog ]; then
 302   $mv $paniclog $paniclog.$first
 303   $chown $user:$group $paniclog.$first
 304   $touch $paniclog
 305   $chown $user:$group $paniclog
 306   $chmod 640 $paniclog
 307 fi
 308
 309 # Now scan the (0)02 and later files, compressing where necessary, and
 310 # ensuring that their owners and groups are correct.
 311
 312 count=2;
 313
 314 while [ $count -le $keep ]; do
 315   if [ $keep -gt 99 ]; then
 316     if   [ $count -lt 10 ]; then countt=00$count
 317     elif [ $count -lt 100 ]; then countt=0$count
 318     else countt=$count
 319     fi
 320   else
 321     if [ $count -lt 10 ]; then countt=0$count; else countt=$count; fi
 322   fi
 323   if [ -f $mainlog.$countt ]; then $compress $mainlog.$countt; fi
 324   if [ -f $mainlog.$countt.$suffix ]; then
 325     $chown $user:$group $mainlog.$countt.$suffix
 326   fi
 327   if [ -f $rejectlog.$countt ]; then $compress $rejectlog.$countt; fi
 328   if [ -f $rejectlog.$countt.$suffix ]; then
 329     $chown $user:$group $rejectlog.$countt.$suffix
 330   fi
 331   if [ -f $paniclog.$countt ]; then $compress $paniclog.$countt; fi
 332   if [ -f $paniclog.$countt.$suffix ]; then
 333     $chown $user:$group $paniclog.$countt.$suffix
 334   fi
 335
 336   count=`expr -- $count + 1`
 337 done
 338
 339 # End of exicyclog