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