93 lines
3.6 KiB
Plaintext
93 lines
3.6 KiB
Plaintext
|
'\"
|
||
|
|
'\" Copyright (c) 1990-1994 The Regents of the University of California.
|
||
|
|
'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
|
||
|
|
'\"
|
||
|
|
'\" See the file "license.terms" for information on usage and redistribution
|
||
|
|
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
||
|
|
'\"
|
||
|
|
'\" SCCS: @(#) send.n 1.18 96/08/27 13:21:47
|
||
|
|
'\"
|
||
|
|
.so man.macros
|
||
|
|
.TH send n 4.0 Tk "Tk Built-In Commands"
|
||
|
|
.BS
|
||
|
|
'\" Note: do not modify the .SH NAME line immediately below!
|
||
|
|
.SH NAME
|
||
|
|
send \- Execute a command in a different application
|
||
|
|
.SH SYNOPSIS
|
||
|
|
\fBsend ?\fIoptions\fR? \fIapp cmd \fR?\fIarg arg ...\fR?
|
||
|
|
.BE
|
||
|
|
|
||
|
|
.SH DESCRIPTION
|
||
|
|
.PP
|
||
|
|
This command arranges for \fIcmd\fR (and \fIarg\fRs) to be executed in the
|
||
|
|
application named by \fIapp\fR. It returns the result or
|
||
|
|
error from that command execution.
|
||
|
|
\fIApp\fR may be the name of any application whose main window is
|
||
|
|
on the display containing the sender's main window; it need not
|
||
|
|
be within the same process.
|
||
|
|
If no \fIarg\fR arguments are present, then the command to be executed is
|
||
|
|
contained entirely within the \fIcmd\fR argument. If one or
|
||
|
|
more \fIarg\fRs are present, they are concatenated to form the
|
||
|
|
command to be executed, just as for the \fBeval\fR command.
|
||
|
|
.PP
|
||
|
|
If the initial arguments of the command begin with ``\-''
|
||
|
|
they are treated as options. The following options are
|
||
|
|
currently defined:
|
||
|
|
.TP
|
||
|
|
\fB\-async\fR
|
||
|
|
Requests asynchronous invocation. In this case the \fBsend\fR
|
||
|
|
command will complete immediately without waiting for \fIcmd\fR
|
||
|
|
to complete in the target application; no result will be available
|
||
|
|
and errors in the sent command will be ignored.
|
||
|
|
If the target application is in the same process as the sending
|
||
|
|
application then the \fB\-async\fR option is ignored.
|
||
|
|
.TP
|
||
|
|
\fB\-displayof\fR \fIpathName\fR
|
||
|
|
Specifies that the target application's main window is on the display
|
||
|
|
of the window given by \fIpathName\fR, instead of the display containing
|
||
|
|
the application's main window.
|
||
|
|
.TP
|
||
|
|
\fB\-\|\-\fR
|
||
|
|
Serves no purpose except to terminate the list of options. This
|
||
|
|
option is needed only if \fIapp\fR could contain a leading ``\-''
|
||
|
|
character.
|
||
|
|
|
||
|
|
.SH "APPLICATION NAMES"
|
||
|
|
.PP
|
||
|
|
The name of an application is set initially from the name of the
|
||
|
|
program or script that created the application.
|
||
|
|
You can query and change the name of an application with the
|
||
|
|
\fBtk appname\fR command.
|
||
|
|
|
||
|
|
.SH "DISABLING SENDS"
|
||
|
|
.PP
|
||
|
|
If the \fBsend\fR command is removed from an application (e.g.
|
||
|
|
with the command \fBrename send {}\fR) then the application
|
||
|
|
will not respond to incoming send requests anymore, nor will it
|
||
|
|
be able to issue outgoing requests.
|
||
|
|
Communication can be reenabled by invoking the \fBtk appname\fR
|
||
|
|
command.
|
||
|
|
|
||
|
|
.SH SECURITY
|
||
|
|
.PP
|
||
|
|
The \fBsend\fR command is potentially a serious security loophole,
|
||
|
|
since any application that can connect to your X server can send
|
||
|
|
scripts to your applications.
|
||
|
|
These incoming scripts can use Tcl to read and
|
||
|
|
write your files and invoke subprocesses under your name.
|
||
|
|
Host-based access control such as that provided by \fBxhost\fR
|
||
|
|
is particularly insecure, since it allows anyone with an account
|
||
|
|
on particular hosts to connect to your server, and if disabled it
|
||
|
|
allows anyone anywhere to connect to your server.
|
||
|
|
In order to provide at least a small amount of
|
||
|
|
security, Tk checks the access control being used by the server
|
||
|
|
and rejects incoming sends unless (a) \fBxhost\fR-style access control
|
||
|
|
is enabled (i.e. only certain hosts can establish connections) and (b) the
|
||
|
|
list of enabled hosts is empty.
|
||
|
|
This means that applications cannot connect to your server unless
|
||
|
|
they use some other form of authorization
|
||
|
|
such as that provide by \fBxauth\fR.
|
||
|
|
|
||
|
|
.SH KEYWORDS
|
||
|
|
application, name, remote execution, security, send
|