+++ /dev/null
-# 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($thishost = `hostname`);
-
-# *S = symbol for current I/O, gets assigned *chatsymbol....
-$next = "chatsymbol000000"; # next one
-$nextpat = "^chatsymbol"; # patterns that match next++, ++, ++, ++
-
-
-## $handle = &chat'open_port("server.address",$port_number);
-## opens a named or numbered TCP server
-
-sub open_port { ## public
- local($server, $port) = @_;
-
- local($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, $4);
- } else {
- local(@x) = gethostbyname($server);
- return undef unless @x;
- $serveraddr = $x[4];
- }
- $serverproc = pack($sockaddr, 2, $port, $serveraddr);
- unless (socket(S, $pf_inet, $sock_stream, $tcp_proto)) {
- ($!) = ($!, close(S)); # close S while saving $!
- return undef;
- }
- unless (bind(S, $thisproc)) {
- ($!) = ($!, close(S)); # close S while saving $!
- return undef;
- }
- unless (connect(S, $serverproc)) {
- ($!) = ($!, 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]);
- $next; # return symbol for switcharound
-}
-
-## ($host, $port, $handle) = &chat'open_listen([$port_number]);
-## opens a TCP port on the current machine, ready to be listened to
-## if $port_number is absent or zero, pick a default port number
-## process must be uid 0 to listen to a low port number
-
-sub open_listen { ## public
-
- *S = ++$next;
- local($thisport) = shift || 0;
- local($thisproc_local) = pack($sockaddr, 2, $thisport, $thisaddr);
- local(*NS) = "__" . time;
- unless (socket(NS, $pf_inet, $sock_stream, $tcp_proto)) {
- ($!) = ($!, close(NS));
- return undef;
- }
- unless (bind(NS, $thisproc_local)) {
- ($!) = ($!, close(NS));
- return undef;
- }
- unless (listen(NS, 1)) {
- ($!) = ($!, close(NS));
- return undef;
- }
- select((select(NS), $| = 1)[0]);
- local($family, $port, @myaddr) =
- unpack("S n C C C C x8", getsockname(NS));
- $S{"needs_accept"} = *NS; # so expect will open it
- (@myaddr, $port, $next); # returning this
-}
-
-## $handle = &chat'open_proc("command","arg1","arg2",...);
-## opens a /bin/sh on a pseudo-tty
-
-sub open_proc { ## public
- local(@cmd) = @_;
-
- *S = ++$next;
- local(*TTY) = "__TTY" . time;
- local($pty,$tty) = &_getpty(S,TTY);
- die "Cannot find a new pty" unless defined $pty;
- $pid = fork;
- die "Cannot fork: $!" unless defined $pid;
- unless ($pid) {
- close STDIN; close STDOUT; close STDERR;
- setpgrp(0,$$);
- if (open(DEVTTY, "/dev/tty")) {
- ioctl(DEVTTY,0x20007471,0); # XXX s/b &TIOCNOTTY
- close DEVTTY;
- }
- open(STDIN,"<&TTY");
- open(STDOUT,">&TTY");
- open(STDERR,">&STDOUT");
- die "Oops" unless fileno(STDERR) == 2; # sanity
- close(S);
- exec @cmd;
- die "Cannot exec @cmd: $!";
- }
- close(TTY);
- $next; # return symbol for switcharound
-}
-
-# $S is the read-ahead buffer
-
-## $return = &chat'expect([$handle,] $timeout_time,
-## $pat1, $body1, $pat2, $body2, ... )
-## $handle is from previous &chat'open_*().
-## $timeout_time is the time (either relative to the current time, or
-## absolute, ala time(2)) at which a timeout event occurs.
-## $pat1, $pat2, and so on are regexs which are matched against the input
-## stream. If a match is found, the entire matched string is consumed,
-## and the corresponding body eval string is evaled.
-##
-## Each pat is a regular-expression (probably enclosed in single-quotes
-## in the invocation). ^ and $ will work, respecting the current value of $*.
-## If pat is 'TIMEOUT', the body is executed if the timeout is exceeded.
-## If pat is 'EOF', the body is executed if the process exits before
-## the other patterns are seen.
-##
-## Pats are scanned in the order given, so later pats can contain
-## general defaults that won't be examined unless the earlier pats
-## have failed.
-##
-## The result of eval'ing body is returned as the result of
-## the invocation. Recursive invocations are not thought
-## through, and may work only accidentally. :-)
-##
-## undef is returned if either a timeout or an eof occurs and no
-## corresponding body has been defined.
-## I/O errors of any sort are treated as eof.
-
-$nextsubname = "expectloop000000"; # used for subroutines
-
-sub expect { ## public
- if ($_[0] =~ /$nextpat/) {
- *S = shift;
- }
- local($endtime) = shift;
-
- local($timeout,$eof) = (1,1);
- local($caller) = caller;
- local($rmask, $nfound, $timeleft, $thisbuf);
- local($cases, $pattern, $action, $subname);
- $endtime += time if $endtime < 600_000_000;
-
- if (defined $S{"needs_accept"}) { # is it a listen socket?
- local(*NS) = $S{"needs_accept"};
- delete $S{"needs_accept"};
- $S{"needs_close"} = *NS;
- unless(accept(S,NS)) {
- ($!) = ($!, close(S), close(NS));
- return undef;
- }
- select((select(S), $| = 1)[0]);
- }
-
- # now see whether we need to create a new sub:
-
- unless ($subname = $expect_subname{$caller,@_}) {
- # nope. make a new one:
- $expect_subname{$caller,@_} = $subname = $nextsubname++;
-
- $cases .= <<"EDQ"; # header is funny to make everything elsif's
-sub $subname {
- LOOP: {
- if (0) { ; }
-EDQ
- while (@_) {
- ($pattern,$action) = splice(@_,0,2);
- if ($pattern =~ /^eof$/i) {
- $cases .= <<"EDQ";
- elsif (\$eof) {
- package $caller;
- $action;
- }
-EDQ
- $eof = 0;
- } elsif ($pattern =~ /^timeout$/i) {
- $cases .= <<"EDQ";
- elsif (\$timeout) {
- package $caller;
- $action;
- }
-EDQ
- $timeout = 0;
- } else {
- $pattern =~ s#/#\\/#g;
- $cases .= <<"EDQ";
- elsif (\$S =~ /$pattern/) {
- \$S = \$';
- package $caller;
- $action;
- }
-EDQ
- }
- }
- $cases .= <<"EDQ" if $eof;
- elsif (\$eof) {
- undef;
- }
-EDQ
- $cases .= <<"EDQ" if $timeout;
- elsif (\$timeout) {
- undef;
- }
-EDQ
- $cases .= <<'ESQ';
- else {
- $rmask = "";
- vec($rmask,fileno(S),1) = 1;
- ($nfound, $rmask) =
- select($rmask, undef, undef, $endtime - time);
- if ($nfound) {
- $nread = sysread(S, $thisbuf, 1024);
- if ($nread > 0) {
- $S .= $thisbuf;
- } else {
- $eof++, redo LOOP; # any error is also eof
- }
- } else {
- $timeout++, redo LOOP; # timeout
- }
- redo LOOP;
- }
- }
-}
-ESQ
- eval $cases; die "$cases:\n$@" if $@;
- }
- $eof = $timeout = 0;
- do $subname();
-}
-
-## &chat'print([$handle,] @data)
-## $handle is from previous &chat'open().
-## like print $handle @data
-
-sub print { ## public
- if ($_[0] =~ /$nextpat/) {
- *S = shift;
- }
-
- local $out = join $, , @_;
- syswrite(S, $out, length $out);
- if( $chat'debug ){
- print STDERR "printed:";
- print STDERR @_;
- }
-}
-
-## &chat'close([$handle,])
-## $handle is from previous &chat'open().
-## like close $handle
-
-sub close { ## public
- if ($_[0] =~ /$nextpat/) {
- *S = shift;
- }
- close(S);
- if (defined $S{"needs_close"}) { # is it a listen socket?
- local(*NS) = $S{"needs_close"};
- delete $S{"needs_close"};
- close(NS);
- }
-}
-
-## @ready_handles = &chat'select($timeout, @handles)
-## select()'s the handles with a timeout value of $timeout seconds.
-## Returns an array of handles that are ready for I/O.
-## Both user handles and chat handles are supported (but beware of
-## stdio's buffering for user handles).
-
-sub select { ## public
- local($timeout) = shift;
- local(@handles) = @_;
- local(%handlename) = ();
- local(%ready) = ();
- local($caller) = caller;
- local($rmask) = "";
- for (@handles) {
- if (/$nextpat/o) { # one of ours... see if ready
- local(*SYM) = $_;
- if (length($SYM)) {
- $timeout = 0; # we have a winner
- $ready{$_}++;
- }
- $handlename{fileno($_)} = $_;
- } else {
- $handlename{fileno(/'/ ? $_ : "$caller\'$_")} = $_;
- }
- }
- for (sort keys %handlename) {
- vec($rmask, $_, 1) = 1;
- }
- select($rmask, undef, undef, $timeout);
- for (sort keys %handlename) {
- $ready{$handlename{$_}}++ if vec($rmask,$_,1);
- }
- sort keys %ready;
-}
-
-# ($pty,$tty) = $chat'_getpty(PTY,TTY):
-# internal procedure to get the next available pty.
-# opens pty on handle PTY, and matching tty on handle TTY.
-# returns undef if can't find a pty.
-# Modify "/dev/pty" to "/dev/pts" for Dell Unix v2.2 (aka SVR4.04). Joe Doupnik.
-
-sub _getpty { ## private
- local($_PTY,$_TTY) = @_;
- $_PTY =~ s/^([^']+)$/(caller)[$[]."'".$1/e;
- $_TTY =~ s/^([^']+)$/(caller)[$[]."'".$1/e;
- local($pty, $tty, $kind);
- if( -e "/dev/pts000" ){ ## mods by Joe Doupnik Dec 1992
- $kind = "pts"; ## SVR4 Streams
- } else {
- $kind = "pty"; ## BSD Clist stuff
- }
- for $bank (112..127) {
- next unless -e sprintf("/dev/$kind%c0", $bank);
- for $unit (48..57) {
- $pty = sprintf("/dev/$kind%c%c", $bank, $unit);
- open($_PTY,"+>$pty") || next;
- select((select($_PTY), $| = 1)[0]);
- ($tty = $pty) =~ s/pty/tty/;
- open($_TTY,"+>$tty") || next;
- select((select($_TTY), $| = 1)[0]);
- system "stty nl>$tty";
- return ($pty,$tty);
- }
- }
- undef;
-}
-
-1;
projects / p5sagit/p5-mst-13.2.git / commitdiff