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## $Id: newgroup.pl 7849 2008-05-25 17:11:32Z iulius $
##
## newgroup control message handler.
##
## Copyright 2001 by Marco d'Itri <md@linux.it>
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions
## are met:
##
## 1. Redistributions of source code must retain the above copyright
## notice, this list of conditions and the following disclaimer.
##
## 2. Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in the
## documentation and/or other materials provided with the distribution.
use strict;
sub control_newgroup {
my ($par, $sender, $replyto, $site, $action, $log, $approved,
$headers, $body) = @_;
my ($groupname, $modflag) = @$par;
$modflag ||= '';
my $modcmd = $modflag eq 'moderated' ? 'm' : 'y';
my $errmsg;
$errmsg= local_checkgroupname($groupname) if defined &local_checkgroupname;
if ($errmsg) {
$errmsg = checkgroupname($groupname) if $errmsg eq 'DONE';
if ($log) {
logger($log, "skipping newgroup ($errmsg)", $headers, $body);
} else {
logmsg("skipping newgroup ($errmsg)");
}
return;
}
# Scan active to see what sort of change we are making.
open(ACTIVE, $inn::active) or logdie("Cannot open $inn::active: $!");
my @oldgroup;
while (<ACTIVE>) {
next unless /^(\Q$groupname\E)\s\d+\s\d+\s(\w)/;
@oldgroup = split /\s+/;
last;
}
close ACTIVE;
my $status;
my $ngdesc = 'No description.';
my $olddesc = '';
my $ngname = $groupname;
# If there is a tag line, search whether the description has changed.
my $found = 0;
my $ngline = '';
foreach (@$body) {
if ($found) {
# It is the line which contains the description.
$ngline = $_;
last;
}
$found = 1 if $_ =~ /^For your newsgroups file:\s*$/;
}
if ($found) {
($ngname, $ngdesc) = split(/\s+/, $ngline, 2);
if ($ngdesc) {
$ngdesc =~ s/\s+$//;
$ngdesc =~ s/\s+\(moderated\)\s*$//i;
$ngdesc .= ' (Moderated)' if $modflag eq 'moderated';
}
# Scan newsgroups to see the previous description, if any.
open(NEWSGROUPS, $inn::newsgroups)
or logdie("Cannot open $inn::newsgroups: $!");
while (<NEWSGROUPS>) {
if (/^\Q$groupname\E\s+(.*)/) {
$olddesc = $1;
last;
}
}
close NEWSGROUPS;
}
if (@oldgroup) {
if ($oldgroup[3] eq 'm' and $modflag ne 'moderated') {
$status = 'be made unmoderated';
} elsif ($oldgroup[3] ne 'm' and $modflag eq 'moderated') {
$status = 'be made moderated';
} else {
if ($ngdesc eq $olddesc) {
$status = 'no change';
} else {
$status = 'have a new description';
}
}
} elsif (not $approved) {
$status = 'unapproved';
} else {
$status = 'be created';
}
if ($action eq 'mail' and $status !~ /(no change|unapproved)/) {
my $mail = sendmail("newgroup $groupname $modcmd $sender");
print $mail <<END;
$sender asks for $groupname
to $status.
If this is acceptable, type:
$inn::newsbin/ctlinnd newgroup $groupname $modcmd $sender
And do not forget to update the corresponding description in your
newsgroups file.
The control message follows:
END
print $mail map { s/^~/~~/; "$_\n" } @$headers;
print $mail "\n";
print $mail map { s/^~/~~/; "$_\n" } @$body;
close $mail or logdie("Cannot send mail: $!");
} elsif ($action eq 'log') {
if ($log) {
logger($log, "skipping newgroup $groupname $modcmd"
. " $sender (would $status)", $headers, $body);
} else {
logmsg("skipping newgroup $groupname $modcmd $sender"
. " (would $status)");
}
} elsif ($action eq 'doit' and $status ne 'unapproved') {
if ($status ne 'no change') {
# The status 'be made (un)moderated' prevails over
# 'have a new description' so it is executed.
ctlinnd('newgroup', $groupname, $modcmd, $sender)
if $status ne 'have a new description';
# We know the description has changed.
update_desc($ngname, $ngdesc) if $ngdesc and $ngname eq $groupname;
}
if ($log) {
logger($log, "newgroup $groupname $modcmd $status $sender",
$headers, $body) if ($log ne 'mail' or $status ne 'no change');
}
}
return;
}
sub update_desc {
my ($name, $desc) = @_;
shlock("$inn::locks/LOCK.newsgroups");
my $tempfile = "$inn::newsgroups.$$";
open(NEWSGROUPS, $inn::newsgroups)
or logdie("Cannot open $inn::newsgroups: $!");
open(TEMPFILE, ">$tempfile") or logdie("Cannot open $tempfile: $!");
while (<NEWSGROUPS>) {
next if (/^\Q$name\E\s+(.*)/);
print TEMPFILE $_;
}
# We now write a pretty line for the description.
if (length $name < 8) {
print TEMPFILE "$name\t\t\t$desc\n";
} elsif (length $name < 16) {
print TEMPFILE "$name\t\t$desc\n";
} else {
print TEMPFILE "$name\t$desc\n";
}
close TEMPFILE;
close NEWSGROUPS;
rename($tempfile, $inn::newsgroups)
or logdie("Cannot rename $tempfile: $!");
unlink("$inn::locks/LOCK.newsgroups", $tempfile);
}
# Check the group name. This is partially derived from C News.
# Some checks are commented out if I think they're too strict or
# language-dependent. Your mileage may vary.
sub checkgroupname {
local $_ = shift;
# whole-name checking
return 'Empty group name' if /^$/;
return 'Whitespace in group name' if /\s/;
return 'Unsafe group name' if /[\`\/:;]/;
return 'Bad dots in group name' if /^\./ or /\.$/ or /\.\./;
# return 'Group name does not begin/end with alphanumeric'
# if (/^[a-zA-Z0-9].+[a-zA-Z0-9]$/;
return 'Group name begins in control., junk. or to.' if /^(?:control|junk|to)\./;
# return 'Group name too long' if length $_ > 128;
my @components = split(/\./);
# prevent alt.a.b.c.d.e.f.g.w.x.y.z...
return 'Too many components' if $#components > 9;
# per-component checking
for (my $i = 0; $i <= $#components; $i++) {
local $_ = $components[$i];
return 'all-numeric name component' if /^[0-9]+$/;
# return 'name component starts with non-alphanumeric' if /^[a-zA-Z0-9]/;
# return 'name component does not contain letter' if not /[a-zA-Z]/;
return "`all' or `ctl' used as name component" if /^(?:all|ctl)$/;
# return 'name component longer than 30 characters' if length $_ > 30;
# return 'uppercase letter(s) in name' if /[A-Z]/;
return 'illegal character(s) in name' if /[^a-z0-9+_\-.]/;
# sigh, c++ etc must be allowed
return 'repeated punctuation in name' if /--|__|\+\+./;
# return 'repeated component(s) in name' if ($i + 2 <= $#components
# and $_ eq $components[$i + 1] and $_ eq $components[$i + 2]);
}
return '';
}
1;
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