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NetBSD/dist/am-utils/scripts/lostaltmail.in
dogcow fda6698809 Import of am-utils-6.0.3 virgin source, with the following changes: 
"$Id: blah$" => "Id: blah" (as well as for $Header:$) for all files
 "$NetBSD: $" added to the top of all .c and .h files
2000-06-07 00:52:18 +00:00

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#!@PERL@ -sw
#
# Package: am-utils-6.0
# Author: James Tanis <jtt@cs.columbia.edu>
#
############################################################################
#
# lostaltmail -- remail files files found alt_mail (or -a argument to hlfsd) to
# whomever should receive it. This version is for SMTP varient which
# support VRFY as a non-expanding verifier!!! (sendmail V8 is a an
# example).
#
# Usage: lostaltmail [-debug] [-nomail] [-noverify]
#
# GLOBAL VARIABLES (as if you care :-) )
# Probably a very incomplete list.
#
# Everything in the config file for this program *and* ...
#
# $debug: set it from the command line with -debug. Does the obvious
# $nomail: set it from the command line with -nomail. *Not* implied by
# $debug
# $currentTO: The addresss we are currently checking on. Actually this is
# left over from an earlier version of lostaltmail and will hopefully
# go away.
# $noverify: set it from the address line. Avoid verification of $currentTO.
# This should be relatively safe as long as your are willing to
# endure bounces from mail that cannot be redelivered as opposed to
# just getting a warning. UNTESTED (but should work).
#
# $logopen: state variable indicating weather the log file (should there be
# one) is in fact open.
#
# @allentries: Array of all the directory entries in $MAILDIR
# @allnames: Array of all *likely* recipients. It is created from @allentries
# sans junk files (see $MAILJUNK and $LOCALMAILJUNK)
# @wanderers: Array of all the files associated with a *single* address
# which might need remailing. Should lostaltmail die unexpectedly,
# it might leave a temporary file containing messages it was
# currently trying to deliver. These will get picked and resent
# later.
#
# VRFY: Handle onto SMTP verification channel. Not to be confused with mail
# delivery; only verification occurs accross this handle.
#
############################################################################
##############################################################################
# #
# SMTP_SEND #
# #
##############################################################################
#
# Send a message to the smtp channel. Inserts the necessary NEWLINE if it
# does not exist;
# I stole this from myself. It shouldn nott be printing errors to STDERR, but
# this is a quick hack.
#
sub smtp_send {
local ($msg) = @_;
local ($length);
$length=length($msg);
if ( $msg !~ /^.*\n$/ ) {
$msg = $msg . "\n";
$length++;
}
if ( ! syswrite (VRFY, $msg, $length)) {
print STDERR "Failing SMTP write: $msg";
return 0;
}
return 1;
}
##############################################################################
# #
# SMTP_RECV #
# #
##############################################################################
#
# Read in lines from SMTP connection and return the final
# Really hideous -- please excuse.
#
sub smtp_recv {
local ($line,$rin, $win, $ein, $readbuf, $ret);
$readbuf = "";
$rin = $win = $ein = ''; # Null fd sets,
vec ($rin, fileno(VRFY), 1) = 1; # Stolen straight from the example;
$ein = $rin | $win; # This is probably useless
LINE_OF_INPUT:
while (1) { # Read in all the input
if ((select ( $rin, $win, $ein, 600.0))[0] == 0 ) {
print "select returned -1" if ($debug);
return -1; # timeout
}
sysread (VRFY, $readbuf, 1024);
chop ($readbuf);
foreach $line ( split('\n', $readbuf)) {
# This loop is actually needed since V8 has a multi-line greet.
( $line =~ /^(\d\d\d).*/ && ($SMTP_retval=$1)) ||
warn "Badly formed reply from SMTP peer: $line\n";
# Space after return code indicates EOT
if ($line =~ /^\d\d\d /) {
$ret = $line; # Oddly $line is in a different context here;
# and thus we need to export it out of the
# while loop via $ret.
last LINE_OF_INPUT;
}
} # End of read.
} # End of input.
return $ret;
}
##############################################################################
# #
# LOG_INFO #
# #
##############################################################################
#
#
# Opens appropriate logging file -- STDOUT (cron) or temp file (mail).
#
sub Log_info {
local($message) = @_;
if ( !$logopened ) {
if ( $MAILGRUNT eq "" || $debug) {
open (LOGFILE, ">-") || die "Unable to open stdout";
}
else {
# Snarf the log into a tmp file for final mailing to MAILGRUNT
$logfile = $LOGFILE . ".$$";
open (LOGFILE, (">". "$logfile")) || die "Unable to create log file";
}
}
$logopened=1; # Note that the log is now open
# Heart of the function.
print LOGFILE "$message";
print LOGFILE "\n" if ( index($message,"\n") == -1 );
}
##############################################################################
# #
# LOCK_FILE #
# #
##############################################################################
#
# Tries to grab a lock on the supplied file name.
# Spins for a bit if it can't on the assumption that the lock will be released
# quickly. If it times out and it's allowed to requeue, it will defer
# until later, other wise write a message to loginfo.
# If a recurring error or really unexpected situation arrises, return
# ABORT_RESEND
#
# PARAMETERS
# mailfile: path to the file to resend.
# should_requeue: BOOLEAN - TRUE if the mailfile should be put on the
# queue for a later retry if we can not finish
# now.
sub Lock_file {
local($mailfile,$should_requeue,$i,$new_lost_file) = @_;
# We need to rename the current mailbox so that mail can loop back into it if
# the resent mail just gets looped right back to us.
$new_lost_file = $mailfile . ".$$";
# make a tmpfile name based on mailfile;
$lostlockfile = "$mailfile" . "$LOCKEXT";
if ( ! open(LOCKFILE, (">" . $lostlockfile)) ) {
printf(STDERR "Could not create lostlockfile for %s: %s\n", $mailfile,$!);
return $ABORT_RESEND;
}
close(LOCKFILE);
$maillockfile = "$mailfile" . "$LOCAL_LOCK_EXT";
for ($i=0; $i < $LOCK_RETRIES && ! link ($lostlockfile, $maillockfile);
$i++) {
sleep(1);
}
unlink($lostlockfile); # No matter what eliminate our cruft
if ( $i == $LOCK_RETRIES ) {
&Log_info("Could not grab lock on: " . "$mailfile" . " :timed out");
if ( $should_requeue ) {
&Log_info("Requeing " . "$mailfile" . " for later retry");
$retry_list .= " $mailfile";
}
else {
&Log_info("Giving up on: " . "$mailfile");
}
return $ABORT_RESEND;
}
# We created the link and therefore have the lock
if (rename ($mailfile, $new_lost_file) == 0 ){
# Failed to rename file -- this is serious.
unlink($maillockfile);
return $ABORT_RESEND;
}
unlink($maillockfile);
return $new_lost_file;
}
##############################################################################
# #
# PARSE NEXT MAIL MESSAGE #
# #
##############################################################################
#
# Parameters:
# mailfile: handle of mailfile to use.
#
# Parses the next message in the mail file and inserts it in $current_msg
#
sub Get_next_msg {
local($mailfile,$found_body_delimiter) = @_;
# If this is the first message in the spool file, read the first line
# otherwise use the MESSAGE_DELIM line from the previous message (which we
# were forced to overread).
$done=$FALSE;
$found_body_delimiter=$FALSE;
# This if eats the very first "From " line and should never fire again.
if ( ! defined $current_msg ) {<$mailfile>};
undef ($current_msg); # Erase the old message.
# Read the mailfile and pass through all the lines up until the next
# message delimiter. Kill any previous resend headers.
while ( <$mailfile> ) {
last if (/$MESSAGE_DELIM/);
next if ( !$found_body_delimiter && /[Rr][Ee][Ss][Ee][Nn][Tt]-.+:/);
if ( !$found_body_delimiter && /^$HEADER_BODY_DELIM/) {
&Splice_in_resent_headers();
$found_body_delimiter=$TRUE;
}
if (defined($current_msg)) {
$current_msg .= $_;
} else {
$current_msg = $_;
}
}
# Return TRUE when we have hit the end of the file.
if (!defined($_) || $_ eq "" ) {
return $TRUE;
} else {
return $FALSE;
}
}
##############################################################################
# #
# SPLICE IN RESENT_HEADERS #
# #
##############################################################################
#
# Insert the Resent- headers at the *current location* of the message stream
# (In Engish, print out a few Resent-X: lines and return :-) )
# In addition splice in the X-resent-info: header.
#
# Paremters: None.
# Return: None
#
sub Splice_in_resent_headers {
local($date,$utctime,$weekday,$time,$month,$hostname);
$current_msg .= "$RESENT_TO" . "$currentTO" . "\n";
$current_msg .= "$RESENT_FROM" . "$SYSTEM_FROM_ADDRESS" . "\n";
# Calculate date and time. It is a bit of a shame to do this each time
# the time needs to be acurate.
@utctime=gmtime(time);
$weekday=(Sun,Mon,Tue,Wed,Thu,Fri,Sat)[$utctime[6]];
# If the minutes or second do not take two columns each, patch em up.
if ( $utctime[1] < 10 ) {
if ( $utctime[0] < 10 ) {
$time=sprintf("%d:0%d:0%d",$utctime[2],$utctime[1],$utctime[0]);
}
else {
$time=sprintf("%d:0%d:%d",$utctime[2],$utctime[1],$utctime[0]);
}
}
else {
if ( $utctime[0] < 10 ) {
$time=sprintf("%d:%d:0%d",$utctime[2],$utctime[1],$utctime[0]);
}
else {
$time=sprintf("%d:%2d:%2d",$utctime[2],$utctime[1],$utctime[0]);
}
}
$month=(Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec)[$utctime[4]];
# Ensure Y2K format
$date=sprintf("%s, %d %s %d %s UTC", $weekday, $utctime[3], $month, $utctime[5]+1900, $time);
$current_msg .= "$RESENT_DATE" . $date . "\n";
if ( defined $RESENT_INFO && $RESENT_INFO ne "") {
$hostname=`uname -n`;
$current_msg .= "$RESENT_INFO" . "Lost mail resent from ". $hostname;
}
return;
}
##############################################################################
# #
# DO_REMAIL #
# #
##############################################################################
#
# Actually resends the mail. Talks to the process configured as $MAILER
# We need better handling.
#
sub Do_remail {
open (MAILER, "| $MAILER $currentTO") || return $ABORT_RESEND;
print MAILER $current_msg;
close (MAILER);
}
##############################################################################
# #
# CLEAN_UP #
# #
##############################################################################
#
# Clean up my messes.
#
sub Clean_up {
local ($hostname);
# Ugly local hack that you should never have seen, but I forgot to
# remove. Hopefully it did not kill you (I tried as you see), but you
# should eiter remove or update it for yourself. I find the message
# subject needs to have the hostname to be useful.
#
chop ($hostname=`uname -n`);
$LOG_SUBJECT="$LOG_SUBJECT from $hostname" if ( $hostname =~ /.*\.cs\.columbia\.edu/ );
#
# End of ugly local hack
# Mail any log info to MAILGRUNT.
if (defined($logfile) && $logfile ne "" ) {
close (LOGFILE); # Flush logfile output.
if ( -s $logfile ) {
open (MAILER, "| $MAILER $MAILGRUNT");
print MAILER "To: $MAILGRUNT\n";
print MAILER "Subject: $LOG_SUBJECT\n";
print MAILER "$HEADER_BODY_DELIM";
open (LOGFILE, "< $logfile");
while (<LOGFILE>) {
print MAILER $_;
}
close (MAILER);
close (LOGFILE);
}
unlink($logfile);
}
exit(0);
}
##############################################################################
# #
# COLLECT_WANDERERS #
# #
##############################################################################
#
# Collects other files that appear to be mail file for the $currentTO
# but were not remailed successfully.
#
# Parameters: none (but uses $currentTO)
# Return: True if a old mail directory is found. False otherwise.
# Side effects: $wanderers set.
#
sub Collect_wanderers {
undef (@wanderers);
# Slurp in the directory and close.
return ($found);
}
#############################################################################
# #
# REMAIL ALL #
# #
#############################################################################
#
# Takes an array of files that all seem to share a common repcipient and
# remails them if possible.
#
# Parameters: None (uses @wanderers).
#
sub Remail_all {
local($file,$i);
$i=0;
foreach $file (@wanderers) {
if ( !open (LOSTFILE, "< $file")) {
&Log_info("Could not open " . "$file" . " for remailing");
next;
}
do { # Power loop!
$done = &Get_next_msg(LOSTFILE); # Retrieve the next message...
&Do_remail; # and remail it.
} until $done;
undef ($current_msg); # Erase the final remailed message.
close(LOSTFILE); # Tidy up.
unlink ($file); # Remove the remailed file
$i++;
}
}
#############################################################################
# #
# CHECK_USER #
# #
#############################################################################
#
# Checks the password tables for the uid of $currentTO. If the user is
# uid 0 (ie *supposed* to get mail in altmail) or unknown the resend is
# aborted.
#
#
sub Check_user {
local (@passwdinfo);
undef (@passwdinfo);
if ( !&vrfy_user($currentTO) ) {
&Log_info("Possible non user mail file: $currentTO");
return $ABORT_RESEND;
}
@passwdinfo = getpwnam($currentTO);
print "Non user mailable mail: Name: $currentTO\n"
if ( $debug && ! defined @passwdinfo );
return !$ABORT_RESEND if ( ! defined @passwdinfo ); # A non user but evidently mailable
print "Check User(): Name: $currentTO -- UID: $passwdinfo[2]\n" if ($debug);
return $ABORT_RESEND if ( $passwdinfo[2] == 0 );
return !$ABORT_RESEND;
}
#############################################################################
# #
# VRFY USER #
# #
#############################################################################
#
# Use SMTP VRFY to insure that argument is in fact a legal mail id.
# Boolean: TRUE if mailable account, FALSE if not.
sub vrfy_user {
local ($mailname,$repl) = @_;
if ( !&smtp_send("vrfy $mailname") ) {
&Log_info("Failed sending to vrfy smtp command for: $mailname");
return 0;
}
$repl = &smtp_recv;
print "VRFY REPLY: $repl\n" if ($debug);
return ( $repl =~ /^2\d\d/ );
}
#############################################################################
# #
# MAIN PROC #
# #
#############################################################################
# dummy code to shut up perl -w
$debug = 0 if !defined($debug);
print $nomail if $debug > 1;
print $RESENT_FROM if $debug > 1;
print $logopen if $debug > 1;
print $LOCAL_LOCK_EXT if $debug > 1;
print $RESENT_TO if $debug > 1;
print $LOCKEXT if $debug > 1;
print $RESENT_DATE if $debug > 1;
print $MESSAGE_DELIM if $debug > 1;
print $SMTP_retval if $debug > 1;
print $found if $debug > 1;
print $retry_list if $debug > 1;
print $MAILJUNK if $debug > 1;
print $noverify if $debug > 1;
print $SYSTEM_FROM_ADDRESS if $debug > 1;
# BEGIN: stuff
$prefix="@prefix@";
$CONFIGDIR="@sysconfdir@"; # Directory where global config lives
require "$CONFIGDIR/lostaltmail.conf" if (-f "$CONFIGDIR/lostaltmail.conf");
require "/etc/global/lostaltmail.conf" if (-f "/etc/global/lostaltmail.conf");
require "/etc/os/lostaltmail.conf" if (-f "/etc/os/lostaltmail.conf");
require "/etc/local/lostaltmail.conf" if (-f "/etc/local/lostaltmail.conf");
require "ctime.pl";
use Socket;
#require "sys/socket.ph";
# SET some initial state variales
$logopen = 0;
#
# Change to alt_dir
#
# Important!! This directory should be local. Folks will be responsible
# for finding this out for themselves.
#
chdir ( $MAILDIR ) || die "Cannot change to $MAILDIR (`x' bit not set?)";
#
# slurp in directory
#
opendir (MAIL, ".") || die "Cannot open $MAILDIR (`r' bit not set?)";
@allentries= readdir (MAIL);
closedir (MAIL);
@allnames = grep (!/$LOCALMAILJUNK|$MAILJUNK/, @allentries);
# Open chanel to SMTP for verification -- unless this option is
# configured off.
if ( ! $noverify ) {
local($addr, $port,$sockaddr);
socket (VRFY, &AF_INET, &SOCK_STREAM, 0) ||
die "Could not create TCP socket (SMTP channel)";
$addr = (gethostbyname($SMTPHOST))[4]; # Just use the first addr
die "Could not obtain STMP host ($SMTPHOST) address"
if ( $addr eq "" );
$port = (getservbyname('smtp','tcp'))[2]; # Get smtp port.
die "Could not obtain SMTP port number" if (!defined($port));
printf("SMTP: address: %s port: $port\n",
join ('.',unpack('C4',$addr))) if ($debug);
$sockaddr = sockaddr_in($port, $addr);
printf("Sockaddr: %s\n", join (' ',unpack('C14',$sockaddr))) if ($debug);
connect (VRFY, $sockaddr) ||
die "Could not connect to SMTP daemon on $SMTPHOST";
print "Establshed SMTP channel\n" if ($debug);
&smtp_recv; # Greet wait
&smtp_send("helo $SMTPHOST"); # Helo message for picky SMTPs
&smtp_recv; # Helo reply
# Connection is up and ready to VRFY
}
# main stuff starts here
foreach $currentTO (@allnames) {
next if ( &Check_user == $ABORT_RESEND);
undef (@wanderers); # Just reset this at each pass.
@wanderers=grep (/$currentTO\.\d+/, @allentries);
$remail_file = &Lock_file($currentTO,$FALSE); # Need to lock the spool.
next if ( $remail_file eq $ABORT_RESEND); # Could not get that lock
push (@wanderers, $remail_file); # Try to resend "old" files.
print "List to remail: @wanderers\n" if ($debug);
# check if there is something to remail
&Remail_all if ( defined @wanderers && !$nomail);
}
# this stuff should run at the end
foreach $file (grep (/$LOCALMAILJUNK/,@allentries)) {
if ($debug) {
print "Would unlink $file\n" if ($debug);
} else {
unlink $file if (-f $file);
}
}
&Clean_up; # Do a clean exit.
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