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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