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+<html><head>
+<title>User service daemon and client specification - Introduction</title>
+<link rev=made href="mailto:ian@davenant.greenend.org.uk">
+</head><body>
+<h1>
+User service daemon and client specification - chapter 1<br>
+Introduction
+</h1>
+There is a daemon which invokes user service programs (henceforth
+`services') in response to requests by callers of a companion client
+program (henceforth the `client') and according to rules set forth in
+system-wide and user-specific configuration files. The companion
+client program is setuid root, and negotiates with the daemon through
+an <kbd>AF_UNIX</kbd> socket and associated objects in a system-wide
+private directory set aside for the purpose. The user who wishes the
+service to be performed and calls the client is called the `calling
+user'; the process which calls the client is called the `calling
+process'.
+<P>
+The daemon and the client are responsible for ensuring that
+information is safely carried across the security boundary between the
+two users, and that the processes on either side cannot interact with
+each other in any unexpected ways.
+<hr>
+User service daemon and client specification
+- <A href="index.html#copyright"><kbd>userv</kbd> is Copyright 1996-1999 Ian Jackson.</A>
+<br>
+<A href="index.html#toc">Contents</A>; <A href="index.html#abstract">abstract</A>; <A href="ch-client.html">next</A>.
+<br>
+<address>0.61.1<br>
+Ian Jackson <A href="mailto:ian@davenant.greenend.org.uk">ian@davenant.greenend.org.uk</A></address>
+</body></html>
~ian / userv.git / blobdiff