observer.pl 17.6 KB
Newer Older
1 2 3 4 5
#!/usr/bin/perl
# this is <observer.pl>
# ----------------------------------------------------------------------------
#
# $Source: /home/tforb/svnbuild/cvssource/CVS/thof/scr/adm/observer/observer.pl,v $
6
# $Id: observer.pl,v 1.5 2000-07-31 13:39:02 thof Exp $
7 8 9 10 11 12 13 14 15 16 17 18 19
#
# 17/01/00 by Thomas Forbriger (IfG Stuttgart)
#
# This is the main tool for observing services
#
# Use this as observer.hourly.pl, observer.daily.pl observer.weekly.pl
# and observer.monthly.pl
#
# REVISIONS and CHANGES
#    17/01/00   V0.1   Thomas Forbriger
#    19/01/00   V1.0   first released Version
#    21/01/00   V1.1   introduced report level check for mail
#    25/01/00   V1.2   changed reporting scheme
20 21
#    21/02/00   V1.3   changed differences reporting scheme
#                      (was not working in former version)
thomas.forbriger's avatar
thomas.forbriger committed
22
#    22/02/00   V1.4   change to users home directory before calling /bin/su
23
#    07/03/00   V1.5   now reports new lines
24
#    31/07/00   V1.6   now uses /bin/bash as su login shell
25 26 27 28 29 30
#
# ============================================================================
#
# we aren't using Sys::Syslog as I did not managed to get any message through
#use Sys::Syslog;

31
$VERSION="OBSERVER   V1.6   central service";
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229

# called program name
# -------------------
$OBSERVER_NAME=$0;

# ----------------------------------------------------------------------------
# static configs
# ==============
# 
# default config file
# -------------------
$DEFAULT_CONFIG="$ENV{HOME}/observer/observer.cfg";
#
# syslog priority
$SYSLOG_FACILITY  ="user";
$SYSLOG_ALERT     ="$SYSLOG_FACILITY.alert";
$SYSLOG_NOTICE    ="$SYSLOG_FACILITY.notice";
$SYSLOG_OK        ="$SYSLOG_FACILITY.info";
#
# status levels
$STATUS_ALERT  ="A";
$STATUS_NOTICE ="N";
$STATUS_OK     ="O";
#
# external binaries
# -----------------
$binECHO    ="/bin/echo";
$binSU      ="/bin/su";
$binBASH    ="/bin/bash";
$binLOGGER  ="/usr/bin/logger";
$binMAIL    ="/usr/bin/mail";
#
# ----------------------------------------------------------------------------

# check environment for config file setting
# -----------------------------------------
if ( -r $ENV{OBSERVER_CONFIG} && -T $ENV{OBSERVER_CONFIG} ) {
  $CONFIG_FILE=$ENV{OBSERVER_CONFIG}
} else {
  $CONFIG_FILE=$DEFAULT_CONFIG
}

# read config file
# ----------------
do $CONFIG_FILE or die "ERROR: reading config file $CONFIG_FILE: $!\n";

# ============================================================================
#
# define subroutines
# ==================

# log a message (to syslog) - generic code
# ----------------------------------------
sub GENERICLOG {
  $loglevel=shift;
  open (syslog, "|$binLOGGER -p $loglevel -t $OBSERVER_NAME\\[$$\\]")
    or FATAL_ERROR("could not open syslog: $!");
  for (@_) { print syslog "$_\n"; }
  close syslog;
##  for (@_) { syslog('notice', "%s\n", $_) }
}

# log a message (to syslog)
# -------------------------
sub LOG { GENERICLOG($SYSLOG_OK, @_); }

# log a noticeable message (to syslog)
# ------------------------------------
sub NOTICELOG { GENERICLOG($SYSLOG_NOTICE, @_); }

# log an error message (to syslog)
# --------------------------------
sub ERRLOG { GENERICLOG($SYSLOG_ALERT, @_); }

# fatal error condition
# ---------------------
sub FATAL_ERROR {
  $title="FATAL ERROR in $OBSERVER_NAME\[$$\]:";
  ERRLOG($title, @_);
  for ($title, @_) { print stderr "$_\n"; }
  $command=sprintf("|%s -s \"FATAL ERROR: %s\" %s",
    $binMAIL, $OBSERVER_NAME, $OBSERVER_NOTIFY);
  open(MAIL,$command) or die "could not open \'$command\': $!\n";
  print MAIL "$title\n\n";
  for (@_) { print MAIL "$_\n"; }
  close(MAIL);
  die "...this is a fatal error...\n";
}

# check file permissions and ownership
# ------------------------------------
#
# We should have a close look at these values as we will change the effective
# UID. If there is any other user haveing write access to file that will be
# executed under foreign privileges this will be a severe security hole.
sub CHECK_FILE {
  $client=shift;
  $clientuid=shift;
  $clientgid=shift;
  foreach (@_) {
    @statentries=stat("$_");
    if ($#statentries < 0) {
      FATAL_ERROR("ERROR: could not stat $scriptpath!");
    }
    $fileuid=$statentries[4];
    $filegid=$statentries[5];
    $filemode=$statentries[2];
##    printf("uid %s\ngid %s\nmode %s\n",
##      $fileuid, $filegid, $filemode);
##    for (@statentries) { printf("%s, ",$_);} ; printf("\n");
    if ($fileuid != $clientuid) {
      FATAL_ERROR("ERROR: $client does not own $_!");
    }
    if ($filegid != $clientgid) {
      FATAL_ERROR("ERROR: $_ is not in $client group!");
    }
##    $val=(($filemode + 0) & 06022);
    if ((("$filemode" + 0) & 06022) > 0) {
##      printf("mode: %o   and-mode: %o\n", $filemode, $val);
      FATAL_ERROR((sprintf("ERROR: %s",
        $_), sprintf("has insecure mode: (%o)!", $filemode)));
    }
  }
}

# check directory name
# --------------------
sub CHECK_DIR {
  for (@_) {
    if ( ! ( -d $_ && -r $_ && -x $_ )) {
      FATAL_ERROR("\n  directory $_\n  is unusable!");
    }
  }
}

# format status output
# --------------------
sub STATUS_FORM {
  return sprintf("%1.1s %10.10s %14.14s %s", $_[0], $_[1], $_[2], $_[3]);
}

# ============================================================================
#
# continue main code
# ==================
#openlog($OBSERVER_NAME, "pid", $SYSLOG_FACILITY);
LOG "entered $VERSION";

# check definitions
# -----------------
unless ( defined %OBSERVER_CLIENT ) {
  FATAL_ERROR("config hash \$OBSERVER_CLIENT undefined!"); }
unless ( defined %OBSERVER_OKREPORT ) {
  FATAL_ERROR("config hash \$OBSERVER_OKREPORT undefined!"); }
unless ( defined $OBSERVER_NOTIFY ) {
  FATAL_ERROR("config variable \$OBSERVER_NOTIFY undefined!"); }
unless ( defined $OBSERVER_LOGDIR ) {
  FATAL_ERROR("config variable \$OBSERVER_LOGDIR undefined!"); }

# check log path
# --------------
unless ( -d $OBSERVER_LOGDIR && -x $OBSERVER_LOGDIR && -w $OBSERVER_LOGDIR ) {
  FATAL_ERROR("log dir $OBSERVER_LOGDIR is unusable!"); }

# check interval level
# --------------------
$OBSERVER_INTERVAL="NIL";
foreach $interval (keys(%OBSERVER_OKREPORT)) {
  if ($OBSERVER_NAME =~ m/$interval/) {
#    printf ("I am %s!\n", $interval);
    $OBSERVER_INTERVAL=$interval;
  }
}
$OBSERVER_INTERVAL =~ m/^NIL$/ and FATAL_ERROR("illegal interval!"); 
#printf ("Interval is: %s\n", $OBSERVER_INTERVAL);

# ====================
# now scan all clients
# ====================

# initialize report arrays
# ------------------------
@OUTPUT_REPORT=();  # script output
@STATUS_REPORT=();  # status message lines
@ERROR_REPORT=();   # non-fatal errors

# cycle through client list
# =========================
foreach $client (keys(%OBSERVER_CLIENT)) {

# check client
  @pwentries=getpwnam($client);
  if ($#pwentries < 0) {
    FATAL_ERROR("ERROR: $client is unknown to /etc/passwd!");
  }
##  for (@pwentries) { print "$_\n"; }
  $CLIENTUID=$pwentries[2];
  $CLIENTGID=$pwentries[3];
thomas.forbriger's avatar
thomas.forbriger committed
230
  $CLIENTHOME=$pwentries[7];
231 232 233 234 235
##  print "$CLIENTUID $CLIENTGID\n";
  if ($CLIENTUID == 0) {
    NOTICELOG("$client has UID $CLIENTUID!");
    $CALLCMD="$binBASH -c ";
  } else {
236
    $CALLCMD="cd $CLIENTHOME; $binSU $client -l -s $binBASH -c ";
237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382
  }

# set directories
  $OBSERVER_CLDIR=$OBSERVER_CLIENT{$client};
  $OBS_SCRIPT_DIR="$OBSERVER_CLDIR/scripts/$OBSERVER_INTERVAL";
  $OBS_LOG_DIR="$OBSERVER_CLDIR/log/$OBSERVER_INTERVAL";
  CHECK_DIR("$OBSERVER_CLDIR", "$OBS_SCRIPT_DIR", "$OBS_LOG_DIR");
##  printf ("script dir: %s\n",$OBS_SCRIPT_DIR);

# check directory for correct file attributes
  CHECK_FILE($client, $CLIENTUID, $CLIENTGID, $OBS_SCRIPT_DIR);

# scan script directory
# ---------------------
  opendir (scriptdir, $OBS_SCRIPT_DIR) 
    or FATAL_ERROR("ERROR: could not open $OBS_SCRIPT_DIR: $!");
  @scripts = grep { 
      (!m/\.bak$/) 
      && -f "$OBS_SCRIPT_DIR/$_"
      && -x "$OBS_SCRIPT_DIR/$_"
    } readdir(scriptdir);
  closedir(scriptdir);

# cycle thorugh scripts
# ---------------------
  foreach $script (@scripts) {

# check script for correct file attributes
    CHECK_FILE($client, $CLIENTUID, $CLIENTGID, "$OBS_SCRIPT_DIR/$script");

# set up environment
    $ENV{OBS_KEY_STATUS}   ="status:";
    $ENV{OBS_KEY_MESSAGE}  ="message:";
    $ENV{OBS_KEY_OK}       =$STATUS_OK;
    $ENV{OBS_KEY_NOTICE}   =$STATUS_NOTICE;
    $ENV{OBS_KEY_ALERT}    =$STATUS_ALERT;
    $ENV{OBS_STATUS_OK}    ="status: $STATUS_OK";
    $ENV{OBS_STATUS_NOTICE}="status: $STATUS_NOTICE";
    $ENV{OBS_STATUS_ALERT} ="status: $STATUS_ALERT";
    $ENV{OBS_CLIENT}       =$client;
    $ENV{OBS_SCRIPT}       =$script;
    $ENV{OBS_SCRIPT_DIR}   =$OBS_SCRIPT_DIR;
    $ENV{OBS_LOG_DIR}      =$OBS_LOG_DIR;
    @ltime=localtime;
    $ENV{OBS_LOG}=sprintf("%s/%s_%.4d_%.2d_%.2d_%.2d.log", 
      $OBS_LOG_DIR, $script,
      $ltime[5]+1900, $ltime[4]+1, $ltime[3]+1, $ltime[2]);

# initialize report variables
    $STATUS_LEVEL="";
    $STATUS_MESSAGE="";

# set up command string to be opened
    $command=sprintf("%s \"%s/%s\" 2>&1 |", 
      $CALLCMD, $OBS_SCRIPT_DIR, $script);

    LOG "open \'$command\'";

# prepare output log
    @thisout=();
##    printf("init: %d\n",$#thisout);

# open command and read output from command
    open(COMMAND, $command) or 
      FATAL_ERROR("ERROR: could not open: $command: $!\n");
    while (<COMMAND>) {
      chomp;
      if (/^\s*status:/) { 
        $STATUS_LEVEL="$'";
        $STATUS_LEVEL=~ s/^\s*//;
      } elsif (/^\s*message:/) {
        $STATUS_MESSAGE="$'";
        $STATUS_MESSAGE=~ s/^\s*//;
      } else {
        push @thisout, $_;
      }
##      printf("%s(%d): %s\n",$script,$#thisout,$_);
    }
    close(COMMAND);

# append output to report (in case there is any)
    if ($#thisout >= 0) {
      push @OUTPUT_REPORT, "$script of $client produced output:";
      push @OUTPUT_REPORT, "($command)";
      for (@thisout) { push @OUTPUT_REPORT, "> $_"; }
      push @OUTPUT_REPORT, " ";
    }

##    print "status: $STATUS_LEVEL $STATUS_MESSAGE\n";
# check status report of this service
    $Read_Level=$STATUS_LEVEL;
    $STATUS_LEVEL="";
    foreach $key ($STATUS_OK, $STATUS_NOTICE, $STATUS_ALERT) {
      if ($Read_Level =~ /^\s*$key\s*$/) { $STATUS_LEVEL=$key; }
    }
    if (($STATUS_LEVEL =~ m/^\s*$/) || ($STATUS_MESSAGE =~ m/^\s*$/)) {
      @thisout=("ERROR in status report:",
        "$script of $client returned incomplete status!",
        "($command)");
      if ($STATUS_LEVEL =~ m/^\s*$/) {
        push @thisout, 
          (sprintf("status level (%s) is not set (regex \"^status:\")",
             $Read_Level),
           sprintf("  or incorrect (valid keys: %s, %s, %s)",
             $STATUS_OK,$STATUS_NOTICE, $STATUS_ALERT));
        $STATUS_LEVEL=$STATUS_ALERT;
      }
      if ($STATUS_MESSAGE =~ m/^\s*$/) {
        push @thisout, "status message is not set (regex \"^message:\")";
        $STATUS_MESSAGE="**** MISSING ****";
      }
      ERRLOG(@thisout);
##      for (@thisout) { print "$_\n"; };
      push @ERROR_REPORT, (@thisout," ");
    }
##    print "status: $STATUS_LEVEL $STATUS_MESSAGE\n";

# remember status
    push @STATUS_REPORT, [($client, $script, $STATUS_LEVEL, $STATUS_MESSAGE)];
  } # end of script cycle
} # end of client cycle

# ===================
# now log all reports
# ===================

# set log file names
@ltime=localtime;
$logname=sprintf("%s/%s_%.4d_%.2d_%.2d_%.2d", 
  $OBSERVER_LOGDIR, $OBSERVER_INTERVAL,
  $ltime[5]+1900, $ltime[4]+1, $ltime[3]+1, $ltime[2]);
$LOG_MASTER     ="$logname.log";
$LOG_PREVSTATUS ="$OBSERVER_LOGDIR/prevstatus.$OBSERVER_INTERVAL.log";
$LOG_STATUS     ="$logname.status";

# create status file from status report
@STATUS_FILE=();
for $stline (@STATUS_REPORT) { 
  push @STATUS_FILE, 
    STATUS_FORM($$stline[2], $$stline[0], $$stline[1], $$stline[3]);
};

# compare with previous status report
# -----------------------------------
@PREVIOUS_STATUS=();
@STATUS_DIFF=();
383
@STATUS_NEW=();
384 385 386 387 388 389
if (-r $LOG_PREVSTATUS) {
  if (open(PREVSTATUS, "<$LOG_PREVSTATUS")) {
# read previous
    @PREVIOUS_STATUS=(<PREVSTATUS>);
    close(PREVSTATUS);
    chomp(@PREVIOUS_STATUS);
390 391 392 393 394
#
# ---
# create differences (what was in old status that is not in current one)
# ---
#
395 396 397 398 399 400 401
# create a working copy of the current status
    @current_status=@STATUS_FILE;
# take each line of previous status
    foreach $stline (sort (@PREVIOUS_STATUS)) {
# remember line and remove meta characters
      $orline = $stline;
      $stline =~ tr/*.?+//d;
402
##      print "$stline\n";
403 404 405 406
# search for this pattern in current status
# the extra '$_' is necessary as map evaluates in list context
# without map would return the number of tr-substitutions
      @matching=grep { m/^$stline$/ } map { tr/*.?+//d; $_; } (@current_status);
407 408
##      print "$#matching\n";
      if ($#matching < 0) {
409
        push @STATUS_DIFF, $orline;
410 411
      }
    }
412 413 414 415 416 417 418
# so, are there any differences now?
    if ($#STATUS_DIFF < 0) {
      $DIFFERENCES=0;
      @STATUS_DIFF="none"; i
    } else {
      $DIFFERENCES=1;
    }
419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449
#
# ---
# create new (what was in current status that is not in old one)
# ---
#
# create a working copy of the current status
    @current_status=@STATUS_FILE;
    @previous_status=@PREVIOUS_STATUS;
# take each line of previous status
    foreach $stline (sort (@current_status)) {
# remember line and remove meta characters
      $orline = $stline;
      $stline =~ tr/*.?+//d;
##      print "$stline\n";
# search for this pattern in current status
# the extra '$_' is necessary as map evaluates in list context
# without map would return the number of tr-substitutions
      @matching=grep { m/^$stline$/ } map { tr/*.?+//d; $_; }
        (@previous_status);
##      print "$#matching\n";
      if ($#matching < 0) {
        push @STATUS_NEW, $orline;
      }
    }
# so, are there any differences now?
    if ($#STATUS_NEW < 0) {
      $NEW=0;
      @STATUS_NEW="none"; i
    } else {
      $NEW=1;
    }
450 451 452
  } else {
    @STATUS_DIFF=("could not open $LOG_PREVSTATUS: $!");
    ERRLOG(@STATUS_DIFF);
453 454
    @STATUS_NEW=@STATUS_FILE;
    $NEW=1;
455 456 457 458
  } # if open
} else {
  @STATUS_DIFF=("There was no previous status log found...");
  ERRLOG(@STATUS_DIFF);
459 460
  @STATUS_NEW=@STATUS_FILE;
  $NEW=1;
461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543
} # if -r

$now_time=localtime;

# write status file
# -----------------
if (open(STATUSFILE, ">>$LOG_STATUS")) {
  printf STATUSFILE ("%s\n", $now_time);
  for (@STATUS_FILE) { print STATUSFILE "$_\n"; }
  close(STATUSFILE);
} else {
  $error="could not open $LOG_STATUS: $!";
  push @ERROR_REPORT, ($error, " ");
  ERRLOG($error);
}

# write "previous" status file
# ----------------------------
if (open(STATUSFILE, ">$LOG_PREVSTATUS")) {
  for (@STATUS_FILE) { print STATUSFILE "$_\n"; }
  close(STATUSFILE);
} else {
  $error="could not open $LOG_PREVSTATUS: $!";
  push @ERROR_REPORT, ($error, " ");
  ERRLOG($error);
}

# prepare full report
# -------------------
@OBSERVER_REPORT=();

@STATUS_HEAD=(STATUS_FORM(("S","user","service","message")),
  STATUS_FORM("---","--------------------------",
    "-------------------------------",
    substr("--------------------------------------------------------", 1,46)));

# find status level
$MASTER_LEVEL="OK";
@STLINES_OK     =grep { m/^$STATUS_OK / }     sort(@STATUS_FILE);
@STLINES_NOTICE =grep { m/^$STATUS_NOTICE / } sort(@STATUS_FILE);
@STLINES_ALERT  =grep { m/^$STATUS_ALERT / }  sort(@STATUS_FILE);
@TELL_OK=();
@TELL_NOTICE=();
@TELL_ALERT=();
if ($#STLINES_OK     >= 0) {
  @TELL_OK=("OK level:",     @STATUS_HEAD, @STLINES_OK, " ");
}
if ($#STLINES_NOTICE >= 0) { 
  $MASTER_LEVEL="NOTICE"; 
  @TELL_NOTICE=("NOTICE level:", @STATUS_HEAD, @STLINES_NOTICE, " ");
}
if ($#STLINES_ALERT  >= 0) { 
  $MASTER_LEVEL="ALERT";  
  @TELL_ALERT=("ALERT level:",  @STATUS_HEAD, @STLINES_ALERT, " ");
}

@TELL_ERRORS=();
if ($#ERROR_REPORT   >= 0) { 
    $MASTER_LEVEL="ALERT"; 
    @TELL_ERRORS=("ERRORS:", 
                  "-------", @ERROR_REPORT, " ");
  }

# do we have to send an e-mail?
$master_level_index=substr($MASTER_LEVEL,0,1);
$mail_level_indices=$OBSERVER_OKREPORT{$OBSERVER_INTERVAL};
if ($mail_level_indices =~ m/$master_level_index/) {
  $mail_comment="(sent to $OBSERVER_NOTIFY)";
  $mail_it=1;
} else {
  $mail_comment="(no mail sent)";
  $mail_it=0;
}

# build report
@OBSERVER_REPORT=
  ($OBSERVER_VERSION, " ",
   sprintf("This is the %s report at %s", $OBSERVER_INTERVAL, $now_time),
   "The status of this report is: $MASTER_LEVEL $mail_comment", " ",
   @TELL_ERRORS,
   "Client status messages:",
   "=======================",
   sprintf("%.10s: Exit status (%s: OK; %s: NOTICE; %s: ALERT)",
544 545
     "S", $STATUS_OK, $STATUS_NOTICE, $STATUS_ALERT), " ");

546
if ($NEW) {
547
  push @OBSERVER_REPORT,
548 549 550
    ("NEW LINES IN CURRENT RUN:",
     "(i.e. lines that appeared in current one but not in previous one)",
     @STATUS_HEAD, @STATUS_NEW, " ", "This run:");
551 552 553 554 555
}

push @OBSERVER_REPORT,
  (@STATUS_HEAD, @STLINES_ALERT, @STLINES_NOTICE, @STLINES_OK);

556 557 558 559 560 561 562 563 564 565 566 567
if ($DIFFERENCES) {
  push @OBSERVER_REPORT,
    (" ","DIFFERENCES TO PREVIOUS RUN:",
     "(i.e. lines that appeared in previous one but not in this one)",
     @STATUS_HEAD, @STATUS_DIFF);
}

if (! $NEW) {
  push @OBSERVER_REPORT,
  (" ","No new lines compared to previous run...");
}

568 569 570 571 572 573 574 575
if (! $DIFFERENCES) {
  push @OBSERVER_REPORT,
  (" ","No differences to previous run...");
}

push @OBSERVER_REPORT, (" ", 
  "Reports from client services:",
  "=============================", @OUTPUT_REPORT);
576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599

# write full report
# -----------------
open(FULLREPORT, ">>$LOG_MASTER") or
  FATAL_ERROR("could not open $LOG_MASTER: $!", @OBSERVER_REPORT);
for (@OBSERVER_REPORT) { print FULLREPORT "$_\n"; }
close(FULLREPORT);

# mail full report
# ----------------
if ($mail_it) {
  $command=sprintf("|%s -s \"%s: %s observer at %s\" %s",
    $binMAIL, $MASTER_LEVEL, $OBSERVER_INTERVAL,
    $now_time, $OBSERVER_NOTIFY);
  open(MAIL,$command) or 
    FATAL_ERROR("could not open \'$command\': $!\n", @OBSERVER_REPORT);
  for (@OBSERVER_REPORT) { print MAIL "$_\n"; }
  close(MAIL);
}

LOG "finished $VERSION";
exit(0);
#
# ----- END OF observer.pl -----