src/src/exicyclog.src

   1 #! /bin/sh
   2
   3 # Copyright (c) University of Cambridge, 1995 - 2015
   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    --version)
  76       echo "`basename $0`: $0"
  77       echo "build: EXIM_RELEASE_VERSIONEXIM_VARIANT_VERSION"
  78       exit 0
  79       ;;
  80    *) echo "** exicyclog: unknown option $1"
  81       exit 1
  82       ;;
  83    esac
  84    shift
  85 done
  86
  87 # Some operating systems have different versions in which the commands live
  88 # in different places. We have a fudge that will search the usual suspects if
  89 # requested.
  90
  91 for cmd in chgrp chmod chown mv rm touch; do
  92   eval "oldcmd=\$$cmd"
  93   if [ "$oldcmd" != "look_for_it" ] ; then continue ; fi
  94   newcmd=$cmd
  95   for dir in /bin /usr/bin /usr/sbin /usr/etc ; do
  96     if [ -f $dir/$cmd ] ; then
  97       newcmd=$dir/$cmd
  98       break
  99     fi
 100   done
 101   eval $cmd=$newcmd
 102 done
 103
 104 # See if this installation is using the esoteric "USE_EUID" feature of Exim,
 105 # in which it uses the effective user id as a suffix for the configuration file
 106 # name. In order for this to work, exicyclog must be run under the appropriate
 107 # euid.
 108
 109 if [ "CONFIGURE_FILE_USE_EUID" = "yes" ]; then
 110   euid=.`id -u`
 111 fi
 112
 113 # See if this installation is using the esoteric "USE_NODE" feature of Exim,
 114 # in which it uses the host's name as a suffix for the configuration file name.
 115
 116 if [ "CONFIGURE_FILE_USE_NODE" = "yes" ]; then
 117   hostsuffix=.`uname -n`
 118 fi
 119
 120 # Now find the configuration file name. This has got complicated because the
 121 # CONFIGURE_FILE value may now be a list of files. The one that is used is the
 122 # first one that exists. Mimic the code in readconf.c by testing first for the
 123 # suffixed file in each case.
 124
 125 set `awk -F: '{ for (i = 1; i <= NF; i++) print $i }' <<End
 126 CONFIGURE_FILE
 127 End
 128 `
 129 while [ "$config" = "" -a $# -gt 0 ] ; do
 130   if [ -f "$1$euid$hostsuffix" ] ; then
 131     config="$1$euid$hostsuffix"
 132   elif [ -f "$1$euid" ] ; then
 133     config="$1$euid"
 134   elif [ -f "$1$hostsuffix" ] ; then
 135     config="$1$hostsuffix"
 136   elif [ -f "$1" ] ; then
 137     config="$1"
 138   fi
 139   shift
 140 done
 141
 142 # Determine if the log file path is set, and where the spool directory is.
 143 # Search for an exim_path setting in the configure file; otherwise use the bin
 144 # directory. Call that version of Exim to find the spool directory and log file
 145 # path, unless log_file_path was set above by a command line option. BEWARE: a
 146 # tab character is needed in the command below. It has had a nasty tendency to
 147 # get lost in the past. Use a variable to hold a space and a tab to keep the
 148 # tab in one place.
 149
 150 st='     '
 151 exim_path=`grep "^[$st]*exim_path" $config | sed "s/.*=[$st]*//"`
 152 if test "$exim_path" = ""; then exim_path=BIN_DIRECTORY/exim; fi
 153
 154 spool_directory=`$exim_path -C $config -bP spool_directory | sed 's/.*=[  ]*//'`
 155
 156 if [ "$log_file_path" = "" ] ; then
 157   log_file_path=`$exim_path -C $config -bP log_file_path | sed 's/.*=[  ]*//'`
 158 fi
 159
 160 # If log_file_path contains only "syslog" then no Exim log files are in use.
 161 # We can't cycle anything. Complain and give up.
 162
 163 if [ "$log_file_path" = "syslog" ] ; then
 164   echo "*** Exim is logging to syslog - no log files to cycle ***"
 165   exit 1
 166 fi
 167
 168 # Otherwise, remove ":syslog" or "syslog:" (some spaces allowed) and inspect
 169 # what remains. The simplistic regex originally used failed when a filename
 170 # contained "syslog", so we have to use three less general ones, because sed
 171 # doesn't have much power in its regexs.
 172
 173 log_file_path=`echo "$log_file_path" | \
 174   sed 's/^ *:\{0,1\} *syslog *:\{0,1\} *//;s/: *syslog *:/:/;s/: *syslog *$//'`
 175
 176 # If log_file_path is empty, try and get the compiled in default by using
 177 # /dev/null as the configuration file.
 178
 179 if [ "$log_file_path" = "" ]; then
 180   log_file_path=`$exim_path -C /dev/null -bP log_file_path | sed 's/.*=[  ]*//'`
 181   log_file_path=`echo "$log_file_path" | \
 182     sed 's/^ *:\{0,1\} *syslog *:\{0,1\} *//;s/: *syslog *:/:/;s/: *syslog *$//'`
 183 fi
 184
 185 # If log_file_path is still empty, the logs we are interested in are probably
 186 # called "mainlog" and "rejectlog" in the directory called "log" in the spool
 187 # directory. Otherwise we fish out the directory from the given path, and also
 188 # the names of the logs.
 189
 190 if [ "$log_file_path" = "" ]; then
 191   logdir=$spool_directory/log
 192   mainlog=mainlog
 193   rejectlog=rejectlog
 194   paniclog=paniclog
 195 else
 196   logdir=`echo $log_file_path | sed 's?/[^/]*$??'`
 197   logbase=`echo $log_file_path | sed 's?^.*/??'`
 198   mainlog=`echo $logbase | sed 's/%s/main/'`
 199   rejectlog=`echo $logbase | sed 's/%s/reject/'`
 200   paniclog=`echo $logbase | sed 's/%s/panic/'`
 201 fi
 202
 203 # Get into the log directory to do the business.
 204
 205 cd $logdir || exit 1
 206
 207 # If there is no main log file, do nothing.
 208
 209 if [ ! -f $mainlog ]; then exit; fi
 210
 211 # Find out the owner and group of the main log file so that we can re-instate
 212 # this on moved and compressed files, since some operating systems may change
 213 # things. This is a tedious bit of code, but it should work both in operating
 214 # systems where the -l option of ls gives the user and group, and those in which
 215 # you need -lg. The condition is that, if the fifth field of the output from
 216 # ls consists entirely of digits, then the third and fourth fields are the user
 217 # and group.
 218
 219 a=`ls -lg $mainlog`
 220 b=`ls -l  $mainlog`
 221
 222 # These statements work fine in the Bourne or Korn shells, but not in Bash.
 223 # So for the benefit of systems whose /bin/sh is really Bash, they have been
 224 # changed to a messier form.
 225
 226 # user=`echo "$a\n$b\n" | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) print $3; }'`
 227 # group=`echo "$a\n$b\n" | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) print $4; }'`
 228
 229 user=`echo "$a
 230 $b
 231 " | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) { print $3; exit; } }'`
 232
 233 group=`echo "$a
 234 $b
 235 " | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) { print $4; exit; } }'`
 236
 237 # Now do the job. First remove the files that have "fallen off the bottom".
 238 # Look for both the compressed and uncompressed forms.
 239
 240 if [ $keep -lt 10 ]; then rotation=0$keep; else rotation=$keep; fi;
 241
 242 if [ -f $mainlog.$rotation ]; then $rm $mainlog.$rotation; fi;
 243 if [ -f $mainlog.$rotation.$suffix ]; then $rm $mainlog.$rotation.$suffix; fi;
 244
 245 if [ -f $rejectlog.$rotation ]; then $rm $rejectlog.$rotation; fi;
 246 if [ -f $rejectlog.$rotation.$suffix ]; then $rm $rejectlog.$rotation.$suffix; fi;
 247
 248 if [ -f $paniclog.$rotation ]; then $rm $paniclog.$rotation; fi;
 249 if [ -f $paniclog.$rotation.$suffix ]; then $rm $paniclog.$rotation.$suffix; fi;
 250
 251 # Now rename all the previous old files by increasing their numbers by 1.
 252 # When the number is less than 10, insert a leading zero.
 253
 254 count=$keep
 255 if [ $count -lt 10 ]; then countt=0$count; else countt=$count; fi
 256
 257 while [ $count -gt 1 ]; do
 258   old=`expr -- $count - 1`
 259   if [ $keep -gt 99 ]; then
 260     if   [ $old -lt 10 ]; then oldt=00$old
 261     elif [ $old -lt 100 ]; then oldt=0$old
 262     else oldt=$old
 263     fi
 264   else
 265     if [ $old -lt 10 ]; then oldt=0$old; else oldt=$old; fi;
 266   fi
 267   if [ -f $mainlog.$oldt ]; then
 268     $mv $mainlog.$oldt $mainlog.$countt
 269   elif [ -f $mainlog.$oldt.$suffix ]; then
 270     $mv $mainlog.$oldt.$suffix $mainlog.$countt.$suffix
 271   fi
 272   if [ -f $rejectlog.$oldt ]; then
 273     $mv $rejectlog.$oldt $rejectlog.$countt
 274   elif [ -f $rejectlog.$oldt.$suffix ]; then
 275     $mv $rejectlog.$oldt.$suffix $rejectlog.$countt.$suffix
 276   fi
 277   if [ -f $paniclog.$oldt ]; then
 278     $mv $paniclog.$oldt $paniclog.$countt
 279   elif [ -f $paniclog.$oldt.$suffix ]; then
 280     $mv $paniclog.$oldt.$suffix $paniclog.$countt.$suffix
 281   fi
 282   count=$old
 283   countt=$oldt
 284 done
 285
 286 # Now rename the current files as 01 or 001 if keeping more than 99
 287
 288 if [ $keep -gt 99 ]; then first=001; else first=01; fi
 289
 290 # Grab our pid ro avoid race in file creation
 291 ourpid=$$
 292
 293 if [ -f $mainlog ]; then
 294   $mv $mainlog $mainlog.$first
 295   $chown $user:$group $mainlog.$first
 296   $touch $mainlog.$ourpid
 297   $chown $user:$group $mainlog.$ourpid
 298   $chmod 640 $mainlog.$ourpid
 299   $mv $mainlog.$ourpid $mainlog
 300 fi
 301
 302 if [ -f $rejectlog ]; then
 303   $mv $rejectlog $rejectlog.$first
 304   $chown $user:$group $rejectlog.$first
 305   $touch $rejectlog.$ourpid
 306   $chown $user:$group $rejectlog.$ourpid
 307   $chmod 640 $rejectlog.$ourpid
 308   $mv $rejectlog.$ourpid $rejectlog
 309 fi
 310
 311 if [ -f $paniclog ]; then
 312   $mv $paniclog $paniclog.$first
 313   $chown $user:$group $paniclog.$first
 314   $touch $paniclog.$ourpid
 315   $chown $user:$group $paniclog.$ourpid
 316   $chmod 640 $paniclog.$ourpid
 317   $mv $paniclog.$ourpid $paniclog
 318 fi
 319
 320 # Now scan the (0)02 and later files, compressing where necessary, and
 321 # ensuring that their owners and groups are correct.
 322
 323 count=2;
 324
 325 while [ $count -le $keep ]; do
 326   if [ $keep -gt 99 ]; then
 327     if   [ $count -lt 10 ]; then countt=00$count
 328     elif [ $count -lt 100 ]; then countt=0$count
 329     else countt=$count
 330     fi
 331   else
 332     if [ $count -lt 10 ]; then countt=0$count; else countt=$count; fi
 333   fi
 334   if [ -f $mainlog.$countt ]; then $compress $mainlog.$countt; fi
 335   if [ -f $mainlog.$countt.$suffix ]; then
 336     $chown $user:$group $mainlog.$countt.$suffix
 337   fi
 338   if [ -f $rejectlog.$countt ]; then $compress $rejectlog.$countt; fi
 339   if [ -f $rejectlog.$countt.$suffix ]; then
 340     $chown $user:$group $rejectlog.$countt.$suffix
 341   fi
 342   if [ -f $paniclog.$countt ]; then $compress $paniclog.$countt; fi
 343   if [ -f $paniclog.$countt.$suffix ]; then
 344     $chown $user:$group $paniclog.$countt.$suffix
 345   fi
 346
 347   count=`expr -- $count + 1`
 348 done
 349
 350 # End of exicyclog