integrate cfgperl contents into mainline

[p5sagit/p5-mst-13.2.git] / lib / chat2.pl

diff --git a/lib/chat2.pl b/lib/chat2.pl
index 662872c..504fa7e 100644 (file)
--- a/lib/chat2.pl
+++ b/lib/chat2.pl
@@ -1,12 +1,39 @@
-## chat.pl: chat with a server
-## V2.01.alpha.7 91/06/16
-## Randal L. Schwartz
+# chat.pl: chat with a server
+#
+# This library is no longer being maintained, and is included for backward
+# compatibility with Perl 4 programs which may require it.
+#
+# In particular, this should not be used as an example of modern Perl
+# programming techniques.
+#
+# Suggested alternative: Socket
+#
+# Based on: V2.01.alpha.7 91/06/16
+# Randal L. Schwartz (was <merlyn@stonehenge.com>)
+# multihome additions by A.Macpherson@bnr.co.uk
+# allow for /dev/pts based systems by Joe Doupnik <JRD@CC.USU.EDU>
 
 package chat;
 
+require 'sys/socket.ph';
+
+if( defined( &main'PF_INET ) ){
+       $pf_inet = &main'PF_INET;
+       $sock_stream = &main'SOCK_STREAM;
+       local($name, $aliases, $proto) = getprotobyname( 'tcp' );
+       $tcp_proto = $proto;
+}
+else {
+       # XXX hardwired $PF_INET, $SOCK_STREAM, 'tcp'
+       # but who the heck would change these anyway? (:-)
+       $pf_inet = 2;
+       $sock_stream = 1;
+       $tcp_proto = 6;
+}
+
+
 $sockaddr = 'S n a4 x8';
-chop($thishost = `hostname`); $thisaddr = (gethostbyname($thishost))[4];
-$thisproc = pack($sockaddr, 2, 0, $thisaddr);
+chop($thishost = `hostname`);
 
 # *S = symbol for current I/O, gets assigned *chatsymbol....
 $next = "chatsymbol000000"; # next one
@@ -21,6 +48,10 @@ sub open_port { ## public
 
        local($serveraddr,$serverproc);
 
+       # We may be multi-homed, start with 0, fixup once connexion is made
+       $thisaddr = "\0\0\0\0" ;
+       $thisproc = pack($sockaddr, 2, 0, $thisaddr);
+
        *S = ++$next;
        if ($server =~ /^(\d+)+\.(\d+)\.(\d+)\.(\d+)$/) {
                $serveraddr = pack('C4', $1, $2, $3, $4);
@@ -30,9 +61,7 @@ sub open_port { ## public
                $serveraddr = $x[4];
        }
        $serverproc = pack($sockaddr, 2, $port, $serveraddr);
-       unless (socket(S, 2, 1, 6)) {
-               # XXX hardwired $AF_SOCKET, $SOCK_STREAM, 'tcp'
-               # but who the heck would change these anyway? (:-)
+       unless (socket(S, $pf_inet, $sock_stream, $tcp_proto)) {
                ($!) = ($!, close(S)); # close S while saving $!
                return undef;
        }
@@ -44,6 +73,13 @@ sub open_port { ## public
                ($!) = ($!, close(S)); # close S while saving $!
                return undef;
        }
+# We opened with the local address set to ANY, at this stage we know
+# which interface we are using.  This is critical if our machine is
+# multi-homed, with IP forwarding off, so fix-up.
+       local($fam,$lport);
+       ($fam,$lport,$thisaddr) = unpack($sockaddr, getsockname(S));
+       $thisproc = pack($sockaddr, 2, 0, $thisaddr);
+# end of post-connect fixup
        select((select(S), $| = 1)[0]);
        $next; # return symbol for switcharound
 }
@@ -59,9 +95,7 @@ sub open_listen { ## public
        local($thisport) = shift || 0;
        local($thisproc_local) = pack($sockaddr, 2, $thisport, $thisaddr);
        local(*NS) = "__" . time;
-       unless (socket(NS, 2, 1, 6)) {
-               # XXX hardwired $AF_SOCKET, $SOCK_STREAM, 'tcp'
-               # but who the heck would change these anyway? (:-)
+       unless (socket(NS, $pf_inet, $sock_stream, $tcp_proto)) {
                ($!) = ($!, close(NS));
                return undef;
        }
@@ -90,7 +124,7 @@ sub open_proc { ## public
        local(*TTY) = "__TTY" . time;
        local($pty,$tty) = &_getpty(S,TTY);
        die "Cannot find a new pty" unless defined $pty;
-       local($pid) = fork;
+       $pid = fork;
        die "Cannot fork: $!" unless defined $pid;
        unless ($pid) {
                close STDIN; close STDOUT; close STDERR;
@@ -108,7 +142,6 @@ sub open_proc { ## public
                die "Cannot exec @cmd: $!";
        }
        close(TTY);
-       $PID{$next} = $pid;
        $next; # return symbol for switcharound
 }
 
@@ -251,7 +284,13 @@ sub print { ## public
        if ($_[0] =~ /$nextpat/) {
                *S = shift;
        }
-       print S @_;
+
+       local $out = join $, , @_;
+       syswrite(S, $out, length $out);
+       if( $chat'debug ){
+               print STDERR "printed:";
+               print STDERR @_;
+       }
 }
 
 ## &chat'close([$handle,])
@@ -259,15 +298,10 @@ sub print { ## public
 ## like close $handle
 
 sub close { ## public
-       local($pid);
        if ($_[0] =~ /$nextpat/) {
-               $pid = $PID{$_[0]};
                *S = shift;
-       } else {
-               $pid = $PID{$next};
        }
        close(S);
-       waitpid($pid,0);
        if (defined $S{"needs_close"}) { # is it a listen socket?
                local(*NS) = $S{"needs_close"};
                delete $S{"needs_close"};
@@ -314,16 +348,22 @@ sub select { ## public
 # internal procedure to get the next available pty.
 # opens pty on handle PTY, and matching tty on handle TTY.
 # returns undef if can't find a pty.
+# Modify "/dev/pty" to "/dev/pts" for Dell Unix v2.2 (aka SVR4.04). Joe Doupnik.
 
 sub _getpty { ## private
        local($_PTY,$_TTY) = @_;
        $_PTY =~ s/^([^']+)$/(caller)[$[]."'".$1/e;
        $_TTY =~ s/^([^']+)$/(caller)[$[]."'".$1/e;
-       local($pty,$tty);
+       local($pty, $tty, $kind);
+       if( -e "/dev/pts000" ){         ## mods by Joe Doupnik Dec 1992
+               $kind = "pts";          ## SVR4 Streams
+       } else {
+               $kind = "pty";          ## BSD Clist stuff
+       }
        for $bank (112..127) {
-               next unless -e sprintf("/dev/pty%c0", $bank);
+               next unless -e sprintf("/dev/$kind%c0", $bank);
                for $unit (48..57) {
-                       $pty = sprintf("/dev/pty%c%c", $bank, $unit);
+                       $pty = sprintf("/dev/$kind%c%c", $bank, $unit);
                        open($_PTY,"+>$pty") || next;
                        select((select($_PTY), $| = 1)[0]);
                        ($tty = $pty) =~ s/pty/tty/;