380 lines
9.7 KiB
Perl
380 lines
9.7 KiB
Perl
# chat.pl: chat with a server
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#
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# This library is no longer being maintained, and is included for backward
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# compatibility with Perl 4 programs which may require it.
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#
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# In particular, this should not be used as an example of modern Perl
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# programming techniques.
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#
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# Suggested alternative: Socket
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#
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# Based on: V2.01.alpha.7 91/06/16
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# Randal L. Schwartz (was <merlyn@stonehenge.com>)
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# multihome additions by A.Macpherson@bnr.co.uk
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# allow for /dev/pts based systems by Joe Doupnik <JRD@CC.USU.EDU>
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package chat;
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require 'sys/socket.ph';
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if( defined( &main'PF_INET ) ){
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$pf_inet = &main'PF_INET;
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$sock_stream = &main'SOCK_STREAM;
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local($name, $aliases, $proto) = getprotobyname( 'tcp' );
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$tcp_proto = $proto;
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}
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else {
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# XXX hardwired $PF_INET, $SOCK_STREAM, 'tcp'
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# but who the heck would change these anyway? (:-)
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$pf_inet = 2;
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$sock_stream = 1;
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$tcp_proto = 6;
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}
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$sockaddr = 'S n a4 x8';
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chop($thishost = `hostname`);
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# *S = symbol for current I/O, gets assigned *chatsymbol....
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$next = "chatsymbol000000"; # next one
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$nextpat = "^chatsymbol"; # patterns that match next++, ++, ++, ++
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## $handle = &chat'open_port("server.address",$port_number);
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## opens a named or numbered TCP server
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sub open_port { ## public
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local($server, $port) = @_;
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local($serveraddr,$serverproc);
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# We may be multi-homed, start with 0, fixup once connexion is made
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$thisaddr = "\0\0\0\0" ;
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$thisproc = pack($sockaddr, 2, 0, $thisaddr);
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*S = ++$next;
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if ($server =~ /^(\d+)+\.(\d+)\.(\d+)\.(\d+)$/) {
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$serveraddr = pack('C4', $1, $2, $3, $4);
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} else {
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local(@x) = gethostbyname($server);
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return undef unless @x;
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$serveraddr = $x[4];
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}
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$serverproc = pack($sockaddr, 2, $port, $serveraddr);
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unless (socket(S, $pf_inet, $sock_stream, $tcp_proto)) {
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($!) = ($!, close(S)); # close S while saving $!
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return undef;
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}
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unless (bind(S, $thisproc)) {
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($!) = ($!, close(S)); # close S while saving $!
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return undef;
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}
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unless (connect(S, $serverproc)) {
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($!) = ($!, close(S)); # close S while saving $!
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return undef;
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}
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# We opened with the local address set to ANY, at this stage we know
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# which interface we are using. This is critical if our machine is
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# multi-homed, with IP forwarding off, so fix-up.
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local($fam,$lport);
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($fam,$lport,$thisaddr) = unpack($sockaddr, getsockname(S));
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$thisproc = pack($sockaddr, 2, 0, $thisaddr);
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# end of post-connect fixup
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select((select(S), $| = 1)[0]);
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$next; # return symbol for switcharound
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}
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## ($host, $port, $handle) = &chat'open_listen([$port_number]);
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## opens a TCP port on the current machine, ready to be listened to
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## if $port_number is absent or zero, pick a default port number
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## process must be uid 0 to listen to a low port number
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sub open_listen { ## public
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*S = ++$next;
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local($thisport) = shift || 0;
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local($thisproc_local) = pack($sockaddr, 2, $thisport, $thisaddr);
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local(*NS) = "__" . time;
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unless (socket(NS, $pf_inet, $sock_stream, $tcp_proto)) {
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($!) = ($!, close(NS));
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return undef;
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}
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unless (bind(NS, $thisproc_local)) {
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($!) = ($!, close(NS));
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return undef;
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}
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unless (listen(NS, 1)) {
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($!) = ($!, close(NS));
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return undef;
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}
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select((select(NS), $| = 1)[0]);
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local($family, $port, @myaddr) =
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unpack("S n C C C C x8", getsockname(NS));
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$S{"needs_accept"} = *NS; # so expect will open it
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(@myaddr, $port, $next); # returning this
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}
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## $handle = &chat'open_proc("command","arg1","arg2",...);
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## opens a /bin/sh on a pseudo-tty
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sub open_proc { ## public
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local(@cmd) = @_;
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*S = ++$next;
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local(*TTY) = "__TTY" . time;
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local($pty,$tty) = &_getpty(S,TTY);
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die "Cannot find a new pty" unless defined $pty;
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$pid = fork;
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die "Cannot fork: $!" unless defined $pid;
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unless ($pid) {
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close STDIN; close STDOUT; close STDERR;
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setpgrp(0,$$);
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if (open(DEVTTY, "/dev/tty")) {
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ioctl(DEVTTY,0x20007471,0); # XXX s/b &TIOCNOTTY
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close DEVTTY;
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}
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open(STDIN,"<&TTY");
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open(STDOUT,">&TTY");
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open(STDERR,">&STDOUT");
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die "Oops" unless fileno(STDERR) == 2; # sanity
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close(S);
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exec @cmd;
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die "Cannot exec @cmd: $!";
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}
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close(TTY);
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$next; # return symbol for switcharound
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}
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# $S is the read-ahead buffer
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## $return = &chat'expect([$handle,] $timeout_time,
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## $pat1, $body1, $pat2, $body2, ... )
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## $handle is from previous &chat'open_*().
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## $timeout_time is the time (either relative to the current time, or
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## absolute, ala time(2)) at which a timeout event occurs.
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## $pat1, $pat2, and so on are regexs which are matched against the input
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## stream. If a match is found, the entire matched string is consumed,
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## and the corresponding body eval string is evaled.
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##
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## Each pat is a regular-expression (probably enclosed in single-quotes
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## in the invocation). ^ and $ will work, respecting the current value of $*.
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## If pat is 'TIMEOUT', the body is executed if the timeout is exceeded.
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## If pat is 'EOF', the body is executed if the process exits before
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## the other patterns are seen.
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##
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## Pats are scanned in the order given, so later pats can contain
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## general defaults that won't be examined unless the earlier pats
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## have failed.
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##
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## The result of eval'ing body is returned as the result of
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## the invocation. Recursive invocations are not thought
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## through, and may work only accidentally. :-)
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##
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## undef is returned if either a timeout or an eof occurs and no
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## corresponding body has been defined.
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## I/O errors of any sort are treated as eof.
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$nextsubname = "expectloop000000"; # used for subroutines
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sub expect { ## public
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if ($_[0] =~ /$nextpat/) {
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*S = shift;
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}
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local($endtime) = shift;
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local($timeout,$eof) = (1,1);
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local($caller) = caller;
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local($rmask, $nfound, $timeleft, $thisbuf);
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local($cases, $pattern, $action, $subname);
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$endtime += time if $endtime < 600_000_000;
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if (defined $S{"needs_accept"}) { # is it a listen socket?
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local(*NS) = $S{"needs_accept"};
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delete $S{"needs_accept"};
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$S{"needs_close"} = *NS;
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unless(accept(S,NS)) {
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($!) = ($!, close(S), close(NS));
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return undef;
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}
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select((select(S), $| = 1)[0]);
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}
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# now see whether we need to create a new sub:
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unless ($subname = $expect_subname{$caller,@_}) {
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# nope. make a new one:
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$expect_subname{$caller,@_} = $subname = $nextsubname++;
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$cases .= <<"EDQ"; # header is funny to make everything elsif's
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sub $subname {
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LOOP: {
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if (0) { ; }
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EDQ
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while (@_) {
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($pattern,$action) = splice(@_,0,2);
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if ($pattern =~ /^eof$/i) {
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$cases .= <<"EDQ";
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elsif (\$eof) {
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package $caller;
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$action;
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}
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EDQ
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$eof = 0;
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} elsif ($pattern =~ /^timeout$/i) {
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$cases .= <<"EDQ";
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elsif (\$timeout) {
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package $caller;
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$action;
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}
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EDQ
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$timeout = 0;
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} else {
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$pattern =~ s#/#\\/#g;
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$cases .= <<"EDQ";
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elsif (\$S =~ /$pattern/) {
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\$S = \$';
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package $caller;
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$action;
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}
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EDQ
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}
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}
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$cases .= <<"EDQ" if $eof;
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elsif (\$eof) {
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undef;
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}
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EDQ
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$cases .= <<"EDQ" if $timeout;
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elsif (\$timeout) {
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undef;
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}
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EDQ
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$cases .= <<'ESQ';
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else {
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$rmask = "";
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vec($rmask,fileno(S),1) = 1;
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($nfound, $rmask) =
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select($rmask, undef, undef, $endtime - time);
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if ($nfound) {
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$nread = sysread(S, $thisbuf, 1024);
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if ($nread > 0) {
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$S .= $thisbuf;
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} else {
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$eof++, redo LOOP; # any error is also eof
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}
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} else {
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$timeout++, redo LOOP; # timeout
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}
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redo LOOP;
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}
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}
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}
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ESQ
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eval $cases; die "$cases:\n$@" if $@;
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}
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$eof = $timeout = 0;
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do $subname();
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}
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## &chat'print([$handle,] @data)
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## $handle is from previous &chat'open().
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## like print $handle @data
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sub print { ## public
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if ($_[0] =~ /$nextpat/) {
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*S = shift;
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}
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local $out = join $, , @_;
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syswrite(S, $out, length $out);
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if( $chat'debug ){
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print STDERR "printed:";
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print STDERR @_;
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}
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}
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## &chat'close([$handle,])
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## $handle is from previous &chat'open().
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## like close $handle
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sub close { ## public
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if ($_[0] =~ /$nextpat/) {
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*S = shift;
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}
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close(S);
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if (defined $S{"needs_close"}) { # is it a listen socket?
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local(*NS) = $S{"needs_close"};
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delete $S{"needs_close"};
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close(NS);
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}
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}
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## @ready_handles = &chat'select($timeout, @handles)
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## select()'s the handles with a timeout value of $timeout seconds.
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## Returns an array of handles that are ready for I/O.
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## Both user handles and chat handles are supported (but beware of
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## stdio's buffering for user handles).
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sub select { ## public
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local($timeout) = shift;
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local(@handles) = @_;
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local(%handlename) = ();
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local(%ready) = ();
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local($caller) = caller;
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local($rmask) = "";
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for (@handles) {
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if (/$nextpat/o) { # one of ours... see if ready
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local(*SYM) = $_;
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if (length($SYM)) {
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$timeout = 0; # we have a winner
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$ready{$_}++;
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}
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$handlename{fileno($_)} = $_;
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} else {
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$handlename{fileno(/'/ ? $_ : "$caller\'$_")} = $_;
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}
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}
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for (sort keys %handlename) {
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vec($rmask, $_, 1) = 1;
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}
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select($rmask, undef, undef, $timeout);
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for (sort keys %handlename) {
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$ready{$handlename{$_}}++ if vec($rmask,$_,1);
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}
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sort keys %ready;
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}
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# ($pty,$tty) = $chat'_getpty(PTY,TTY):
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# internal procedure to get the next available pty.
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# opens pty on handle PTY, and matching tty on handle TTY.
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# returns undef if can't find a pty.
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# Modify "/dev/pty" to "/dev/pts" for Dell Unix v2.2 (aka SVR4.04). Joe Doupnik.
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sub _getpty { ## private
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local($_PTY,$_TTY) = @_;
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$_PTY =~ s/^([^']+)$/(caller)[$[]."'".$1/e;
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$_TTY =~ s/^([^']+)$/(caller)[$[]."'".$1/e;
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local($pty, $tty, $kind);
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if( -e "/dev/pts000" ){ ## mods by Joe Doupnik Dec 1992
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$kind = "pts"; ## SVR4 Streams
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} else {
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$kind = "pty"; ## BSD Clist stuff
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}
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for $bank (112..127) {
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next unless -e sprintf("/dev/$kind%c0", $bank);
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for $unit (48..57) {
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$pty = sprintf("/dev/$kind%c%c", $bank, $unit);
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open($_PTY,"+>$pty") || next;
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select((select($_PTY), $| = 1)[0]);
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($tty = $pty) =~ s/pty/tty/;
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open($_TTY,"+>$tty") || next;
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select((select($_TTY), $| = 1)[0]);
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system "stty nl>$tty";
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return ($pty,$tty);
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}
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}
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undef;
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}
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1;
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