81 lines
2.4 KiB
Plaintext
81 lines
2.4 KiB
Plaintext
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=head1 NAME
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hosts_allow - decide if a host is allowed to send mail
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=head1 DESCRIPTION
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The B<hosts_allow> module decides before the SMTP-Greeting if a host is
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allowed to connect. It checks for too many (running) connections from one
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host (see -m/--max-from-ip options in qpsmtpd-forkserver) and the config
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file I<hosts_allow>.
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The plugin takes no arguments.
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=head1 CONFIG
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The config file contains lines with two or three items. The first is either
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an IP address or a network/mask pair. The second is a (valid) return code
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from Qpsmtpd::Constants. The last is a comment which will be returned to the
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connecting client if the return code is DENY or DENYSOFT (and of course
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DENY_DISCONNECT and DENYSOFT_DISCONNECT).
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Example:
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192.168.3.4 DECLINED
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192.168.3.0/24 DENY Sorry, known spam only source
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This would exclude 192.168.3.4 from the DENY of 192.168.3.0/24.
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=cut
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use Qpsmtpd::Constants;
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use Socket;
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sub hook_pre_connection {
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my ($self,$transaction,%args) = @_;
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# remote_ip => inet_ntoa($iaddr),
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# remote_port => $port,
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# local_ip => inet_ntoa($laddr),
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# local_port => $lport,
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# max_conn_ip => $MAXCONNIP,
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# child_addrs => [values %childstatus],
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my $remote = $args{remote_ip};
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if ($args{max_conn_ip}) {
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my $num_conn = 1; # seed with current value
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my $raddr = inet_aton($remote);
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foreach my $rip (@{$args{child_addrs}}) {
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++$num_conn if (defined $rip && $rip eq $raddr);
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}
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if ($num_conn > $args{max_conn_ip}) {
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$self->log(LOGINFO,
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"Too many connections from $remote: "
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. "$num_conn > " . $args{max_conn_ip}
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. "Denying connection.");
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return (DENYSOFT, "Sorry, too many connections from $remote, "
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."try again later");
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}
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}
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foreach ($self->qp->config("hosts_allow")) {
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s/^\s*//;
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my ($ipmask, $const, $message) = split /\s+/, $_, 3;
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next unless defined $const;
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my ($net,$mask) = split '/', $ipmask, 2;
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if (!defined $mask) {
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$mask = 32;
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}
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$mask = pack "B32", "1"x($mask)."0"x(32-$mask);
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if (join(".", unpack("C4", inet_aton($remote) & $mask)) eq $net) {
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$const = Qpsmtpd::Constants::return_code($const) || DECLINED;
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return($const, $message);
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}
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}
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return (DECLINED);
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}
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# vim: sw=4 ts=4 expandtab syn=perl
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