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authorSimon McVittie <smcv@debian.org>2011-02-17 18:28:14 +0000
committerSimon McVittie <smcv@debian.org>2011-02-17 18:28:14 +0000
commit280851b7fdb7050e42403f57cbbbdbc368e59efa (patch)
tree1e0221b28d8a496eee7894c9776eeb84966168cb /doc/dbus-specification.html
parent7e5f91a2e50af075be865533eb6ebdfe6bc5b4ad (diff)
downloaddbus-280851b7fdb7050e42403f57cbbbdbc368e59efa.tar.gz
Imported Upstream version 1.4.4upstream/1.4.4
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@@ -4,7 +4,7 @@
            <code class="email">&lt;<a class="email" href="mailto:andersca@codefactory.se">andersca@codefactory.se</a>&gt;</code><br>
          </p></div></div></div><div class="author"><h3 class="author"><span class="firstname">Alexander</span> <span class="surname">Larsson</span></h3><div class="affiliation"><span class="orgname">Red Hat, Inc.<br></span><div class="address"><p><br>
            <code class="email">&lt;<a class="email" href="mailto:alexl@redhat.com">alexl@redhat.com</a>&gt;</code><br>
-          </p></div></div></div></div></div><div><p class="releaseinfo">Version 0.15</p></div><div><div class="revhistory"><table border="1" width="100%" summary="Revision history"><tr><th align="left" valign="top" colspan="3"><b>Revision History</b></th></tr><tr><td align="left">Revision current</td><td align="left"><a class="ulink" href="http://cgit.freedesktop.org/dbus/dbus/log/doc/dbus-specification.xml" target="_top">commit log</a></td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.15</td><td align="left">3 November 2010</td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.14</td><td align="left">12 May 2010</td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.13</td><td align="left">23 Dezember 2009</td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.12</td><td align="left">7 November, 2006</td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.11</td><td align="left">6 February 2005</td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.10</td><td align="left">28 January 2005</td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.9</td><td align="left">7 Januar 2005</td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.8</td><td align="left">06 September 2003</td><td align="left"></td></tr><tr><td align="left" colspan="3">First released document.</td></tr></table></div></div></div><hr></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="#introduction">Introduction</a></span></dt><dd><dl><dt><span class="sect2"><a href="#stability">Protocol and Specification Stability</a></span></dt></dl></dd><dt><span class="sect1"><a href="#message-protocol">Message Protocol</a></span></dt><dd><dl><dt><span class="sect2"><a href="#message-protocol-signatures">Type Signatures</a></span></dt><dt><span class="sect2"><a href="#message-protocol-marshaling">Marshaling (Wire Format)</a></span></dt><dt><span class="sect2"><a href="#message-protocol-messages">Message Format</a></span></dt><dt><span class="sect2"><a href="#message-protocol-names">Valid Names</a></span></dt><dt><span class="sect2"><a href="#message-protocol-types">Message Types</a></span></dt><dt><span class="sect2"><a href="#message-protocol-handling-invalid">Invalid Protocol and Spec Extensions</a></span></dt></dl></dd><dt><span class="sect1"><a href="#auth-protocol">Authentication Protocol</a></span></dt><dd><dl><dt><span class="sect2"><a href="#auth-protocol-overview">Protocol Overview</a></span></dt><dt><span class="sect2"><a href="#auth-nul-byte">Special credentials-passing nul byte</a></span></dt><dt><span class="sect2"><a href="#auth-command-auth">AUTH command</a></span></dt><dt><span class="sect2"><a href="#auth-command-cancel">CANCEL Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-data">DATA Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-begin">BEGIN Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-rejected">REJECTED Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-ok">OK Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-error">ERROR Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-negotiate-unix-fd">NEGOTIATE_UNIX_FD Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-agree-unix-fd">AGREE_UNIX_FD Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-future">Future Extensions</a></span></dt><dt><span class="sect2"><a href="#auth-examples">Authentication examples</a></span></dt><dt><span class="sect2"><a href="#auth-states">Authentication state diagrams</a></span></dt><dt><span class="sect2"><a href="#auth-mechanisms">Authentication mechanisms</a></span></dt></dl></dd><dt><span class="sect1"><a href="#addresses">Server Addresses</a></span></dt><dt><span class="sect1"><a href="#transports">Transports</a></span></dt><dd><dl><dt><span class="sect2"><a href="#transports-unix-domain-sockets">Unix Domain Sockets</a></span></dt><dt><span class="sect2"><a href="#transports-launchd">launchd</a></span></dt><dt><span class="sect2"><a href="#transports-tcp-sockets">TCP Sockets</a></span></dt><dt><span class="sect2"><a href="#transports-nonce-tcp-sockets">Nonce-secured TCP Sockets</a></span></dt></dl></dd><dt><span class="sect1"><a href="#meta-transports">Meta Transports</a></span></dt><dd><dl><dt><span class="sect2"><a href="#meta-transports-autolaunch">Autolaunch</a></span></dt></dl></dd><dt><span class="sect1"><a href="#naming-conventions">Naming Conventions</a></span></dt><dt><span class="sect1"><a href="#uuids">UUIDs</a></span></dt><dt><span class="sect1"><a href="#standard-interfaces">Standard Interfaces</a></span></dt><dd><dl><dt><span class="sect2"><a href="#standard-interfaces-peer"><code class="literal">org.freedesktop.DBus.Peer</code></a></span></dt><dt><span class="sect2"><a href="#standard-interfaces-introspectable"><code class="literal">org.freedesktop.DBus.Introspectable</code></a></span></dt><dt><span class="sect2"><a href="#standard-interfaces-properties"><code class="literal">org.freedesktop.DBus.Properties</code></a></span></dt></dl></dd><dt><span class="sect1"><a href="#introspection-format">Introspection Data Format</a></span></dt><dt><span class="sect1"><a href="#message-bus">Message Bus Specification</a></span></dt><dd><dl><dt><span class="sect2"><a href="#message-bus-overview">Message Bus Overview</a></span></dt><dt><span class="sect2"><a href="#message-bus-names">Message Bus Names</a></span></dt><dt><span class="sect2"><a href="#message-bus-routing">Message Bus Message Routing</a></span></dt><dt><span class="sect2"><a href="#message-bus-starting-services">Message Bus Starting Services</a></span></dt><dt><span class="sect2"><a href="#message-bus-types">Well-known Message Bus Instances</a></span></dt><dt><span class="sect2"><a href="#message-bus-messages">Message Bus Messages</a></span></dt></dl></dd><dt><span class="glossary"><a href="#id367478">Glossary</a></span></dt></dl></div><div class="sect1" title="Introduction"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="introduction"></a>Introduction</h2></div></div></div><p>
+          </p></div></div></div></div></div><div><p class="releaseinfo">Version 0.15</p></div><div><div class="revhistory"><table border="1" width="100%" summary="Revision history"><tr><th align="left" valign="top" colspan="3"><b>Revision History</b></th></tr><tr><td align="left">Revision current</td><td align="left"><a class="ulink" href="http://cgit.freedesktop.org/dbus/dbus/log/doc/dbus-specification.xml" target="_top">commit log</a></td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.15</td><td align="left">3 November 2010</td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.14</td><td align="left">12 May 2010</td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.13</td><td align="left">23 Dezember 2009</td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.12</td><td align="left">7 November, 2006</td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.11</td><td align="left">6 February 2005</td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.10</td><td align="left">28 January 2005</td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.9</td><td align="left">7 Januar 2005</td><td align="left"></td></tr><tr><td align="left" colspan="3"></td></tr><tr><td align="left">Revision 0.8</td><td align="left">06 September 2003</td><td align="left"></td></tr><tr><td align="left" colspan="3">First released document.</td></tr></table></div></div></div><hr></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="#introduction">Introduction</a></span></dt><dd><dl><dt><span class="sect2"><a href="#stability">Protocol and Specification Stability</a></span></dt></dl></dd><dt><span class="sect1"><a href="#message-protocol">Message Protocol</a></span></dt><dd><dl><dt><span class="sect2"><a href="#message-protocol-signatures">Type Signatures</a></span></dt><dt><span class="sect2"><a href="#message-protocol-marshaling">Marshaling (Wire Format)</a></span></dt><dt><span class="sect2"><a href="#message-protocol-messages">Message Format</a></span></dt><dt><span class="sect2"><a href="#message-protocol-names">Valid Names</a></span></dt><dt><span class="sect2"><a href="#message-protocol-types">Message Types</a></span></dt><dt><span class="sect2"><a href="#message-protocol-handling-invalid">Invalid Protocol and Spec Extensions</a></span></dt></dl></dd><dt><span class="sect1"><a href="#auth-protocol">Authentication Protocol</a></span></dt><dd><dl><dt><span class="sect2"><a href="#auth-protocol-overview">Protocol Overview</a></span></dt><dt><span class="sect2"><a href="#auth-nul-byte">Special credentials-passing nul byte</a></span></dt><dt><span class="sect2"><a href="#auth-command-auth">AUTH command</a></span></dt><dt><span class="sect2"><a href="#auth-command-cancel">CANCEL Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-data">DATA Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-begin">BEGIN Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-rejected">REJECTED Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-ok">OK Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-error">ERROR Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-negotiate-unix-fd">NEGOTIATE_UNIX_FD Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-agree-unix-fd">AGREE_UNIX_FD Command</a></span></dt><dt><span class="sect2"><a href="#auth-command-future">Future Extensions</a></span></dt><dt><span class="sect2"><a href="#auth-examples">Authentication examples</a></span></dt><dt><span class="sect2"><a href="#auth-states">Authentication state diagrams</a></span></dt><dt><span class="sect2"><a href="#auth-mechanisms">Authentication mechanisms</a></span></dt></dl></dd><dt><span class="sect1"><a href="#addresses">Server Addresses</a></span></dt><dt><span class="sect1"><a href="#transports">Transports</a></span></dt><dd><dl><dt><span class="sect2"><a href="#transports-unix-domain-sockets">Unix Domain Sockets</a></span></dt><dt><span class="sect2"><a href="#transports-launchd">launchd</a></span></dt><dt><span class="sect2"><a href="#transports-tcp-sockets">TCP Sockets</a></span></dt><dt><span class="sect2"><a href="#transports-nonce-tcp-sockets">Nonce-secured TCP Sockets</a></span></dt></dl></dd><dt><span class="sect1"><a href="#meta-transports">Meta Transports</a></span></dt><dd><dl><dt><span class="sect2"><a href="#meta-transports-autolaunch">Autolaunch</a></span></dt></dl></dd><dt><span class="sect1"><a href="#naming-conventions">Naming Conventions</a></span></dt><dt><span class="sect1"><a href="#uuids">UUIDs</a></span></dt><dt><span class="sect1"><a href="#standard-interfaces">Standard Interfaces</a></span></dt><dd><dl><dt><span class="sect2"><a href="#standard-interfaces-peer"><code class="literal">org.freedesktop.DBus.Peer</code></a></span></dt><dt><span class="sect2"><a href="#standard-interfaces-introspectable"><code class="literal">org.freedesktop.DBus.Introspectable</code></a></span></dt><dt><span class="sect2"><a href="#standard-interfaces-properties"><code class="literal">org.freedesktop.DBus.Properties</code></a></span></dt></dl></dd><dt><span class="sect1"><a href="#introspection-format">Introspection Data Format</a></span></dt><dt><span class="sect1"><a href="#message-bus">Message Bus Specification</a></span></dt><dd><dl><dt><span class="sect2"><a href="#message-bus-overview">Message Bus Overview</a></span></dt><dt><span class="sect2"><a href="#message-bus-names">Message Bus Names</a></span></dt><dt><span class="sect2"><a href="#message-bus-routing">Message Bus Message Routing</a></span></dt><dt><span class="sect2"><a href="#message-bus-starting-services">Message Bus Starting Services</a></span></dt><dt><span class="sect2"><a href="#message-bus-types">Well-known Message Bus Instances</a></span></dt><dt><span class="sect2"><a href="#message-bus-messages">Message Bus Messages</a></span></dt></dl></dd><dt><span class="glossary"><a href="#id484449">Glossary</a></span></dt></dl></div><div class="sect1" title="Introduction"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="introduction"></a>Introduction</h2></div></div></div><p>
D-Bus is a system for low-latency, low-overhead, easy to use
interprocess communication (IPC). In more detail:
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>
@@ -897,14 +897,14 @@
commands may be introduced both before, and after
authentication, i.e. both before and after the OK command.
</p></div><div class="sect2" title="Authentication examples"><div class="titlepage"><div><div><h3 class="title"><a name="auth-examples"></a>Authentication examples</h3></div></div></div><p>
- </p><div class="figure"><a name="id362126"></a><p class="title"><b>Figure 1. Example of successful magic cookie authentication</b></p><div class="figure-contents"><pre class="programlisting">
+ </p><div class="figure"><a name="id479096"></a><p class="title"><b>Figure 1. Example of successful magic cookie authentication</b></p><div class="figure-contents"><pre class="programlisting">
(MAGIC_COOKIE is a made up mechanism)
C: AUTH MAGIC_COOKIE 3138363935333137393635383634
S: OK 1234deadbeef
C: BEGIN
</pre></div></div><p><br class="figure-break">
- </p><div class="figure"><a name="id362141"></a><p class="title"><b>Figure 2. Example of finding out mechanisms then picking one</b></p><div class="figure-contents"><pre class="programlisting">
+ </p><div class="figure"><a name="id479111"></a><p class="title"><b>Figure 2. Example of finding out mechanisms then picking one</b></p><div class="figure-contents"><pre class="programlisting">
C: AUTH
S: REJECTED KERBEROS_V4 SKEY
C: AUTH SKEY 7ab83f32ee
@@ -913,14 +913,14 @@
S: OK 1234deadbeef
C: BEGIN
</pre></div></div><p><br class="figure-break">
- </p><div class="figure"><a name="id362157"></a><p class="title"><b>Figure 3. Example of client sends unknown command then falls back to regular auth</b></p><div class="figure-contents"><pre class="programlisting">
+ </p><div class="figure"><a name="id479127"></a><p class="title"><b>Figure 3. Example of client sends unknown command then falls back to regular auth</b></p><div class="figure-contents"><pre class="programlisting">
C: FOOBAR
S: ERROR
C: AUTH MAGIC_COOKIE 3736343435313230333039
S: OK 1234deadbeef
C: BEGIN
</pre></div></div><p><br class="figure-break">
- </p><div class="figure"><a name="id362173"></a><p class="title"><b>Figure 4. Example of server doesn't support initial auth mechanism</b></p><div class="figure-contents"><pre class="programlisting">
+ </p><div class="figure"><a name="id479143"></a><p class="title"><b>Figure 4. Example of server doesn't support initial auth mechanism</b></p><div class="figure-contents"><pre class="programlisting">
C: AUTH MAGIC_COOKIE 3736343435313230333039
S: REJECTED KERBEROS_V4 SKEY
C: AUTH SKEY 7ab83f32ee
@@ -929,7 +929,7 @@
S: OK 1234deadbeef
C: BEGIN
</pre></div></div><p><br class="figure-break">
- </p><div class="figure"><a name="id362190"></a><p class="title"><b>Figure 5. Example of wrong password or the like followed by successful retry</b></p><div class="figure-contents"><pre class="programlisting">
+ </p><div class="figure"><a name="id479159"></a><p class="title"><b>Figure 5. Example of wrong password or the like followed by successful retry</b></p><div class="figure-contents"><pre class="programlisting">
C: AUTH MAGIC_COOKIE 3736343435313230333039
S: REJECTED KERBEROS_V4 SKEY
C: AUTH SKEY 7ab83f32ee
@@ -942,7 +942,7 @@
S: OK 1234deadbeef
C: BEGIN
</pre></div></div><p><br class="figure-break">
- </p><div class="figure"><a name="id362208"></a><p class="title"><b>Figure 6. Example of skey cancelled and restarted</b></p><div class="figure-contents"><pre class="programlisting">
+ </p><div class="figure"><a name="id479178"></a><p class="title"><b>Figure 6. Example of skey cancelled and restarted</b></p><div class="figure-contents"><pre class="programlisting">
C: AUTH MAGIC_COOKIE 3736343435313230333039
S: REJECTED KERBEROS_V4 SKEY
C: AUTH SKEY 7ab83f32ee
@@ -955,7 +955,7 @@
S: OK 1234deadbeef
C: BEGIN
</pre></div></div><p><br class="figure-break">
- </p><div class="figure"><a name="id362225"></a><p class="title"><b>Figure 7. Example of successful magic cookie authentication with successful negotiation of Unix FD passing</b></p><div class="figure-contents"><pre class="programlisting">
+ </p><div class="figure"><a name="id479195"></a><p class="title"><b>Figure 7. Example of successful magic cookie authentication with successful negotiation of Unix FD passing</b></p><div class="figure-contents"><pre class="programlisting">
(MAGIC_COOKIE is a made up mechanism)
C: AUTH MAGIC_COOKIE 3138363935333137393635383634
@@ -964,7 +964,7 @@
S: AGREE_UNIX_FD
C: BEGIN
</pre></div></div><p><br class="figure-break">
- </p><div class="figure"><a name="id362242"></a><p class="title"><b>Figure 8. Example of successful magic cookie authentication with unsuccessful negotiation of Unix FD passing</b></p><div class="figure-contents"><pre class="programlisting">
+ </p><div class="figure"><a name="id479211"></a><p class="title"><b>Figure 8. Example of successful magic cookie authentication with unsuccessful negotiation of Unix FD passing</b></p><div class="figure-contents"><pre class="programlisting">
(MAGIC_COOKIE is a made up mechanism)
C: AUTH MAGIC_COOKIE 3138363935333137393635383634
@@ -1242,7 +1242,7 @@
fails, the lock fails. Servers should retry for a reasonable
period of time, then they may choose to delete an existing lock
to keep users from having to manually delete a stale
- lock. <sup>[<a name="id362953" href="#ftn.id362953" class="footnote">1</a>]</sup>
+ lock. <sup>[<a name="id479924" href="#ftn.id479924" class="footnote">1</a>]</sup>
</p></li><li class="listitem"><p>
Once the lockfile has been created, the server loads the cookie
file. It should then delete any cookies that are old (the
@@ -2003,7 +2003,7 @@
must be namespaced using the same mechanism as messages and service
names.
- </p><div class="figure"><a name="id365470"></a><p class="title"><b>Figure 9. Example service description file</b></p><div class="figure-contents"><pre class="programlisting">
+ </p><div class="figure"><a name="id482440"></a><p class="title"><b>Figure 9. Example service description file</b></p><div class="figure-contents"><pre class="programlisting">
# Sample service description file
[D-BUS Service]
Names=org.freedesktop.ConfigurationDatabase;org.gnome.GConf;
@@ -2173,7 +2173,7 @@
allowing another process to set the selection between the
verification and the setting (e.g., by using XGrabServer /
XungrabServer).
- </p></div><div class="sect4"><div class="titlepage"><div><div><h5 class="title"><a name="id366057"></a></h5></div></div></div><p>
+ </p></div><div class="sect4"><div class="titlepage"><div><div><h5 class="title"><a name="id483027"></a></h5></div></div></div><p>
[FIXME specify location of .service files, probably using
DESKTOP_DIRS etc. from basedir specification, though login session
bus is not really desktop-specific]
@@ -2188,7 +2188,7 @@
variable. If that variable is not set, applications should try
to connect to the well-known address
<code class="literal">unix:path=/var/run/dbus/system_bus_socket</code>.
- <sup>[<a name="id366098" href="#ftn.id366098" class="footnote">2</a>]</sup>
+ <sup>[<a name="id483069" href="#ftn.id483069" class="footnote">2</a>]</sup>
</p><p>
[FIXME specify location of system bus .service files]
</p></div></div><div class="sect2" title="Message Bus Messages"><div class="titlepage"><div><div><h3 class="title"><a name="message-bus-messages"></a>Message Bus Messages</h3></div></div></div><p>
@@ -2373,7 +2373,7 @@
There is also a per-machine ID, described in <a class="xref" href="#standard-interfaces-peer" title="org.freedesktop.DBus.Peer">the section called &#8220;<code class="literal">org.freedesktop.DBus.Peer</code>&#8221;</a> and returned
by org.freedesktop.DBus.Peer.GetMachineId().
For a desktop session bus, the bus ID can be used as a way to uniquely identify a user's session.
- </p></div></div></div><div class="glossary" title="Glossary"><div class="titlepage"><div><div><h2 class="title"><a name="id367478"></a>Glossary</h2></div></div></div><p>
+ </p></div></div></div><div class="glossary" title="Glossary"><div class="titlepage"><div><div><h2 class="title"><a name="id484449"></a>Glossary</h2></div></div></div><p>
This glossary defines some of the terms used in this specification.
</p><dl><dt><a name="term-bus-name"></a>Bus Name</dt><dd><p>
The message bus maintains an association between names and
@@ -2447,10 +2447,10 @@
message bus. This name will never change owner, and will be unique
(never reused during the lifetime of the message bus).
It will begin with a ':' character.
- </p></dd></dl></div><div class="footnotes"><br><hr width="100" align="left"><div class="footnote"><p><sup>[<a name="ftn.id362953" href="#id362953" class="para">1</a>] </sup>Lockfiles are used instead of real file
+ </p></dd></dl></div><div class="footnotes"><br><hr width="100" align="left"><div class="footnote"><p><sup>[<a name="ftn.id479924" href="#id479924" class="para">1</a>] </sup>Lockfiles are used instead of real file
locking <code class="literal">fcntl()</code> because real locking
implementations are still flaky on network
- filesystems.</p></div><div class="footnote"><p><sup>[<a name="ftn.id366098" href="#id366098" class="para">2</a>] </sup>
+ filesystems.</p></div><div class="footnote"><p><sup>[<a name="ftn.id483069" href="#id483069" class="para">2</a>] </sup>
The D-Bus reference implementation actually honors the
<code class="literal">$(localstatedir)</code> configure option
for this address, on both client and server side.