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#! /bin/sh
# 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
# PERL_COMMAND
# This file has been so processed.
# A shell+perl wrapper script to run an automated -bh test to check out
# ACLs for incoming addresses.
# Save the shell arguments because we are going to need the shell variables
# while sorting out the configuration file.
args="$@"
# 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
# CONFIGURE_FILE 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 }' < [exim options]\n";
exit(1);
}
$exim_path = $ARGV[0]; # Set up by the calling shell script
$host = $ARGV[1]; # Mandatory original first argument
$recipient = $ARGV[2]; # Mandatory original second argument
$c4 = qr/2 (?:[0-4]\d | 5[0-5]) | 1\d\d | \d{1,2}/x; # IPv4 component
$a4 = qr/^$c4\.$c4\.$c4\.$c4$/; # IPv4 address
$c6 = qr/[0-9a-f]{1,4}/i; # IPv6 component
# Split the various formats of IPv6 addresses into several cases. I don't
# think I can graft regex that matches all of them without using alternatives.
# 1. Starts with :: followed by up to 7 components
$a6_0 = qr/^::(?:$c6:){0,6}$c6$/x;
# 2. 8 non-empty components
$a6_1 = qr/^(?:$c6:){7}$c6$/x;
# 3. This is the cunning one. Up to 7 components, one (and only one) of which
# can be empty. We use 0 to cause a failure when we've already matched
# an empty component and may be hitting other. This has to fail, because we
# know we've just failed to match a component. We also do a final check to
# ensure that there has been an empty component.
$a6_2 = qr/^(?: (?: $c6 | (?(1)0 | () ) ) : ){1,7}$c6 $ (?(1)|.)/x;
if ($host !~ /$a4 | $a6_0 | $a6_1 | $a6_2/x)
{
print "** Invalid IP address \"$host\"\n";
print "Usage: exim_checkaccess [exim options]\n";
exit(1);
}
# Build any remaining original arguments into a string for passing over
# as Exim options.
$opt = "";
for ($i = 3; $i < scalar(@ARGV); $i++) { $opt .= "$ARGV[$i] "; }
# If the string contains "-f xxxx", extract that as the sender. Otherwise
# the sender is <>.
$sender = "";
if ($opt =~ /(?:^|\s)-f\s+(\S+|"[^"]*")/)
{
$sender = $1;
$opt = $` . $';
}
# Run a -bh test in Exim, passing the test data
$pid = open2(*IN, *OUT, "$exim_path -bh $host $opt 2>/dev/null");
print OUT "HELO [$host]\r\n";
print OUT "MAIL FROM:<$sender>\r\n";
print OUT "RCPT TO:<$recipient>\r\n";
print OUT "QUIT\r\n";
close OUT;
# Read the output, ignoring anything but the SMTP response to the RCPT
# command.
$count = 0;
$reply = "";
while ()
{
next if !/^\d\d\d/;
$reply .= $_;
next if /^\d\d\d\-/;
if (++$count != 4)
{
$reply = "";
next;
}
# We have the response we want. Interpret it.
if ($reply =~ /^2\d\d/)
{
print "Accepted\n";
}
else
{
print "Rejected:\n";
$reply =~ s/\n(.)/\n $1/g;
print " $reply";
}
last;
}
# Reap the child process
waitpid $pid, 0;
End