From 03c71116e044fda9d99e827a4ffb0652d508abb5 Mon Sep 17 00:00:00 2001
From: Timo Sirainen <cras@irssi.org>
Date: Sun, 10 Mar 2002 21:28:38 +0000
Subject: added/removed some default scripts

git-svn-id: http://svn.irssi.org/repos/irssi/trunk@2569 dbcabf3a-b0e7-0310-adc4-f8d773084564
---
 scripts/dns.pl | 193 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 193 insertions(+)
 create mode 100644 scripts/dns.pl

(limited to 'scripts/dns.pl')

diff --git a/scripts/dns.pl b/scripts/dns.pl
new file mode 100644
index 00000000..612fab0e
--- /dev/null
+++ b/scripts/dns.pl
@@ -0,0 +1,193 @@
+# /DNS <nick>|<host>|<ip> ...
+
+use Irssi;
+use strict;
+use Socket;
+use POSIX;
+
+use vars qw($VERSION %IRSSI); 
+$VERSION = "2.1";
+%IRSSI = (
+    authors	=> 'Timo Sirainen',
+    name	=> 'dns',
+    description	=> '/DNS <nick>|<host>|<ip> ...',
+    license	=> 'Public Domain',
+    changed	=> 'Sun Mar 10 23:23 EET 2002'
+);
+
+my (%resolve_hosts, %resolve_nicks, %resolve_print); # resolve queues
+my $userhosts; # number of USERHOSTs currently waiting for reply
+my $lookup_waiting; # 1 if we're waiting a reply for host lookup
+
+# for the current host lookup
+my ($print_server, $print_host, $print_name, @print_ips);
+my ($input_skip_next, $input_query);
+
+my $pipe_tag;
+
+sub cmd_dns {
+  my ($nicks, $server) = @_;
+  return if !$nicks;
+
+  # get list of nicks/hosts we want to know
+  my $tag = !$server ? undef : $server->{tag};
+  my $ask_nicks = "";
+  my $print_error = 0;
+  foreach my $nick (split(" ", $nicks)) {
+    $nick = lc($nick);
+    if ($nick =~ /[\.:]/) {
+      # it's an IP or hostname
+      $resolve_hosts{$nick} = $tag;
+    } else {
+      # it's nick
+      if (!$print_error && (!$server || !$server->{connected})) {
+	$print_error = 1;
+	Irssi::print("Not connected to server");
+      } else {
+	$resolve_nicks{$nick} = 1;
+	$ask_nicks .= "$nick ";
+      }
+    }
+  }
+
+  if ($ask_nicks ne "") {
+    # send the USERHOST query
+    $userhosts++;
+    $server->redirect_event('userhost', 1, $ask_nicks, 0, 'redir dns failure', {
+                            'event 302' => 'redir dns host',
+                            '' => 'event empty' } );
+    $server->send_raw("USERHOST :$nicks");
+  }
+
+  # ask the IPs/hostnames immediately
+  host_lookup() if (!$lookup_waiting);
+}
+
+sub sig_failure {
+  Irssi::print("Error getting hostname for nick");
+  %resolve_nicks = () if (--$userhosts == 0);
+}
+
+sub sig_userhost {
+  my ($server, $data) = @_;
+  $data =~ s/^[^ ]* :?//;
+  my @hosts = split(/ +/, $data);
+
+  # move resolve_nicks -> resolve_hosts
+  foreach my $host (@hosts) {
+    if ($host =~ /^([^=\*]*)\*?=.(.*)@(.*)/) {
+      my $nick = lc($1);
+      my $user = $2;
+      $host = lc($3);
+
+      $resolve_hosts{$host} = $resolve_nicks{$nick};
+      delete $resolve_nicks{$nick};
+      $resolve_print{$host} = "[$nick!$user"."@"."$host]";
+    }
+  }
+
+  if (--$userhosts == 0 && %resolve_nicks) {
+    # unknown nicks - they didn't contain . or : so it can't be
+    # IP or hostname.
+    Irssi::print("Unknown nicks: ".join(' ', keys %resolve_nicks));
+    %resolve_nicks = ();
+  }
+
+  host_lookup() if (!$lookup_waiting);
+}
+
+sub host_lookup {
+  return if (!%resolve_hosts);
+
+  my ($host) = keys %resolve_hosts;
+  $print_server = $resolve_hosts{$host};
+
+  $print_host = undef;
+  $print_name = $resolve_print{$host};
+  @print_ips = ();
+
+  delete $resolve_hosts{$host};
+  delete $resolve_print{$host};
+
+  $input_query = $host;
+  $input_skip_next = 0;
+
+  # pipe is used to get the reply from child
+  my ($rh, $wh);
+  pipe($rh, $wh);
+
+  # non-blocking host lookups with fork()ing
+  my $pid = fork();
+  if (!defined($pid)) {
+    %resolve_hosts = ();
+    %resolve_print = ();
+    Irssi::print("Can't fork() - aborting");
+    close($rh); close($wh);
+    return;
+  }
+  $lookup_waiting++;
+
+  if ($pid > 0) {
+    # parent, wait for reply
+    close($wh);
+    Irssi::pidwait_add($pid);
+    $pipe_tag = Irssi::input_add(fileno($rh), INPUT_READ, \&pipe_input, $rh);
+    return;
+  }
+
+  my $text;
+  eval {
+    # child, do the lookup
+    my $name = "";
+    if ($host =~ /^[0-9\.]*$/) {
+      # ip -> host
+      $name = gethostbyaddr(inet_aton($host), AF_INET);
+    } else {
+      # host -> ip
+      my @addrs = gethostbyname($host);
+      if (@addrs) {
+	@addrs = map { inet_ntoa($_) } @addrs[4 .. $#addrs];
+	$name = join (" ", @addrs);
+      }
+    }
+
+    $print_name = $input_query if !$print_name;
+    if (!$name) {
+      $text = "No information for $print_name";
+    } else {
+      $text = "$print_name: $name";
+    }
+  };
+  $text = $! if (!$text);
+
+  eval {
+    # write the reply
+    print($wh $text);
+    close($wh);
+  };
+  POSIX::_exit(1);
+}
+
+sub pipe_input {
+  my $rh = shift;
+  my $text = <$rh>;
+  close($rh);
+
+  Irssi::input_remove($pipe_tag);
+  $pipe_tag = -1;
+
+  my $server = Irssi::server_find_tag($print_server);
+  if ($server) {
+    $server->print('', $text);
+  } else {
+    Irssi::print($text);
+  }
+
+  $lookup_waiting--;
+  host_lookup();
+}
+
+Irssi::command_bind('dns', 'cmd_dns');
+Irssi::signal_add( {
+        'redir dns failure' => \&sig_failure,
+        'redir dns host' => \&sig_userhost } );
-- 
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