#! /bin/sh # Copyright (c) The Exim Maintainers 2023 - 2025 # Copyright (c) University of Cambridge, 1995 - 2007 # See the file NOTICE for conditions of use and distribution. # Except when they appear in comments, the following placeholders in this # source are replaced when it is turned into a runnable script: # # CONFIGURE_FILE_USE_NODE # CONFIGURE_FILE # BIN_DIRECTORY # MSGID_RE # This file has been so processed. # A shell+perl script to fish out the next retry time for a given domain; # it first calls exim to find out which hosts are set up for that domain and # then fishes out the retry data for each one. # For testing the selection and formatting logic, and perhaps for use in # special cases, the script can have an argument -C to specify # the use of an alternate Exim configuration file. It may also have any number # of -D options to set macros that are passed to exim. config= eximmacdef= exim_path= if [ "x$1" = x--version -o "x$1" = x-v ] then echo "`basename $0`: $0" echo "build: 4.99.1" exit 0 fi if expr -- $1 : '\-' >/dev/null ; then while expr -- $1 : '\-' >/dev/null ; do if [ "$1" = "-C" ]; then config=$2 shift shift elif expr -- $1 : '\-D' >/dev/null ; then eximmacdef="$eximmacdef $1" if expr -- $1 : '\-DEXIM_PATH=' >/dev/null ; then exim_path=`expr -- $1 : '\-DEXIM_PATH=$.*$'` fi shift else break fi done fi # We need to save the script's argument because in the absence of -C we need to # use shell arguments for sorting out the configuration file name. argone=$1 # This is the normal case when no config file or macros are specified if [ "$config" = "" ]; then # See if this installation is using the esoteric "USE_NODE" feature of Exim, # in which it uses the host's name as a suffix for the configuration file name. if [ "" = "yes" ]; then hostsuffix=.`uname -n` fi # Now find the configuration file name. This has got complicated because # /etc/exim.conf may now be a list of files. The one that is used is the first # one that exists. Mimic the code in readconf.c by testing first for the # suffixed file in each case. set `awk -F: '{ for (i = 1; i <= NF; i++) print $i }' <||" exit 1 fi perl - $exim_path "$eximmacdef" $argone $spool_directory $qualify_domain $config <<'End' # We don't import anything, but guard against future changes which do BEGIN { pop @INC if $INC[-1] eq '.' }; # Name the arguments $exim = $ARGV[0]; $eximmacdef = $ARGV[1]; $subject = $ARGV[2]; $spool = $ARGV[3]; $qualify = $ARGV[4]; $config = $ARGV[5]; # Insert MSGID_RE # Start msgid.frag # Copyright (c) The Exim Maintainers 2025 # SPDX-License-Identifier: GPL-2.0-or-later # # Regex patterns for exim message-id # Simple matching my $b62 = "[[:alnum:]]"; my $msgid_sec_re = "${b62}{6}"; my $msgid_pid_new_re = "${b62}{11}"; my $msgid_pid_old_re = "${b62}{6}"; my $msgid_frc_new_re = "${b62}{4}"; my $msgid_frc_old_re = "${b62}{2}"; my $msgid_new_re = "$msgid_sec_re-$msgid_pid_new_re-$msgid_frc_new_re"; my $msgid_old_re = "$msgid_sec_re-$msgid_pid_old_re-$msgid_frc_old_re"; my $msgid_re = "(?:$msgid_new_re|$msgid_old_re)"; # Match with content submatches # - requires variables seconds, pid, fractions my $msgid_sec_cap_re = "(?$msgid_sec_re)"; my $msgid_pid_cap_re = "(?(?:$msgid_pid_new_re|$msgid_pid_old_re))"; my $msgid_frc_cap_re = "(?(?:$msgid_frc_new_re|$msgid_frc_old_re))"; my $msgid_cap_re = "(?:$msgid_sec_cap_re-$msgid_pid_cap_re-$msgid_frc_cap_re)"; # End msgid.frag # If the subject doesn't contain an @ then construct an address # for the domain, and ensure that in both cases the domain is # lower cased. $address = ($subject =~ /^([^\@]*)\@([^\@]*)$/)? "$1\@\L$2\E" : "User\@\L$subject\E"; # Run Exim to get a list of hosts for the given domain; for # each one construct the appropriate retry key. open(LIST, "$exim -C $config -v -bt $address |") || die "can't run exim to route $address"; while () { chop; push(@list, $_) if s/\s*host (\S+)\s+\[(.+)\].*/$1:$2/; print "$_\n" if /cannot be resolved/; } close(LIST); # If there were no hosts, assume that what was given was a local # username, unless it contains an @, and construct a suitable retry # key for that. Also, if it looks like a message id, search for that # as well, so as to pick up message-specific retry data. if (scalar(@list) == 0) { push(@list, $subject) if $subject =~ /^$msgid_re$/; if ($subject !~ /\@/ && $subject !~ /\./) { push(@list, "$subject\@$qualify"); } else { print "No remote hosts found for $subject\n"; } } # Always search for the full address, even if hosts are found, in case # there is a routing delay caused by a temporary recipient error. push(@list, $subject); # Run exim_dumpdb to get out the retry data and pick off what we want open(DATA, "${exim}_dumpdb $spool retry |") || die "can't run exim_dumpdb"; while () { for ($i = 0; $i <= $#list; $i++) { if (/$list[$i]/) { $printed = 1; if (/^\s*T:[^:\s]*:/) { # We rely on non-space-containing strings, for parsing ($key,$error,$error2,$text) = /^\s*T:(\S+)\s+(\S+)\s+(\S+)\s*(.*)$/; ($host,$ip,$port,$msgid) = $key =~ /^([^:[]*|\[[^]]*\]) # host (could be an ip) :([^:[]*|\[[^]]*\]) # ip (?::(\d{1,5}))? # maybe port (?::(\S{23}))? # maybe msgid $/x; printf("Transport: %s %s", $host, $ip); print ":$port" if defined $port; print " $msgid" if defined $msgid; print " error $error: $text\n"; } else { ($type,$domain,$error,$error2,$text) = /^\s*(\S):(\S+)\s+(\S+)\s+(\S+)\s*(.*)$/; $type = ($type eq 'R')? "Route: " : ($type eq 'T')? "Transport: " : ""; print "$type$domain error $error: $text\n"; } $_ = ; ($first,$last,$next,$expired) = /^(\S+\s+\S+)\s+(\S+\s+\S+)\s+(\S+\s+\S+)\s*(\*?)/; print " first failed: $first\n"; print " last tried: $last\n"; print " next try at: $next\n"; print " past final cutoff time\n" if $expired eq "*"; } } } close(DATA); print "No retry data found for $subject\n" if !$printed; End