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#! /bin/sh
# Copyright (c) The Exim Maintainers 2023
# 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
# 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 <filename> 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: 4.97.1"
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/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 $i }' <<End
/etc/exim/exim.conf
End
`
while [ "$config" = "" -a $# -gt 0 ] ; do
if [ -f "$1$hostsuffix" ] ; then
config="$1$hostsuffix"
elif [ -f "$1" ] ; then
config="$1"
fi
shift
done
fi
# Determine where the spool directory is. Search for an exim_path setting
# in the configure file; otherwise use the bin directory. Call that version of
# Exim to find the spool directory and the qualify domain. BEWARE: a tab
# character is needed in the command below. It has had a nasty tendency to get
# lost in the past. Use a variable to hold a space and a tab to keep the tab in
# one place.
st=' '
if [ "$exim_path" = "" ]; then
exim_path=`grep "^[$st]*exim_path" $config | sed "s/.*=[$st]*//"`
fi
if test "$exim_path" = ""; then exim_path=/usr/sbin/exim; fi
spool_directory=`$exim_path $eximmacdef -C $config -bP spool_directory | sed 's/.*=[ ]*//'`
qualify_domain=`$exim_path $eximmacdef -C $config -bP qualify_domain | sed 's/.*=[ ]*//'`
# Now do the job. Perl uses $ so frequently that we don't want to have to
# escape them all from the shell, so pass in shell variable values as
# arguments.
# 16-May-1996 Fixed it to do better if routing fails to complete.
# Improved the format of the output.
# 10-Jun-1996 Complain if no argument given.
# 02-Aug-1996 Lower case the domain.
# 14-Jan-1999 Add subject to want list even if remote host found, so as to
# pick up routing delays after temporary recipient errors.
# Also add unqualified subject if it looks like a message id.
# 01-Apr-2004 Add the -C feature for testing
# 22-Dec-2005 Complete the -C feature (!)
if [ "$argone" = "" ]; then
echo "Usage: exinext <address>|<domain>|<local-part>"
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];
# 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 (<LIST>)
{
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 $subject =~ /^\w{6}-\w{6}-\w{2}$/;
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 $spool retry |") ||
die "can't run exim_dumpdb";
while (<DATA>)
{
for ($i = 0; $i <= $#list; $i++)
{
if (/$list[$i]/)
{
$printed = 1;
if (/^\s*T:[^:\s]*:/)
{
($key,$error,$error2,$text) = /^\s*T:(\S+)\s+(\S+)\s+(\S+)\s*(.*)$/;
# Parsing the keys is a nightmare because of IPv6. The design of the
# format for the keys is a complete shambles. All my fault (PH). But
# I don't want to change it just for this purpose. If they key
# contains more than 3 colons, we have an IPv6 address, because
# an IPv6 address must contain at least two colons.
# Deal with IPv4 addresses (3 colons or fewer)
if ($key !~ /:([^:]*?:){3}/)
{
($host,$ip,$port,$msgid) = $key =~
/^([^:]*):([^:]*)(?::([^:]*)(?::(\S*)|)|)/;
}
# Deal with IPv6 addresses; sorting out the colons is a complete
# mess. We should be able to find the host name and IP address from
# further in the message. That seems the easiest escape plan here. We
# can use those to match the rest of the key.
else
{
($host,$ip) = $text =~ /host\s(\S+)\s\[([^]]+)\]/;
if (defined $host)
{
($port,$msgid) = $key =~
/^$host:$ip(?::([^:]*)(?::(\S*)|)|)/;
}
# This will probably be wrong...
else
{
($host,$ip) = $key =~ /([^:]*):(.*)/;
}
}
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";
}
$_ = <DATA>;
($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