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330 lines
13 KiB
XML
330 lines
13 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="varlinkctl"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>varlinkctl</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>varlinkctl</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>varlinkctl</refname>
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<refpurpose>Introspect with and invoke Varlink services</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>varlinkctl</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">info</arg>
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<arg choice="plain"><replaceable>ADDRESS</replaceable></arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>varlinkctl</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">list-interfaces</arg>
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<arg choice="plain"><replaceable>ADDRESS</replaceable></arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>varlinkctl</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">introspect</arg>
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<arg choice="plain"><replaceable>ADDRESS</replaceable></arg>
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<arg choice="plain"><replaceable>INTERFACE</replaceable></arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>varlinkctl</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">call</arg>
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<arg choice="plain"><replaceable>ADDRESS</replaceable></arg>
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<arg choice="plain"><replaceable>METHOD</replaceable></arg>
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<arg choice="opt"><replaceable>ARGUMENTS</replaceable></arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>varlinkctl</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">validate-idl</arg>
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<arg choice="opt"><replaceable>FILE</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>varlinkctl</command> may be used to introspect and invoke <ulink
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url="https://varlink.org/">Varlink</ulink> services.</para>
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<para>Services are referenced by one of the following:</para>
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<itemizedlist>
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<listitem><para>A Varlink service reference starting with the <literal>unix:</literal> string, followed
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by an absolute <constant>AF_UNIX</constant> socket path, or by <literal>@</literal> and an arbitrary string
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(the latter for referencing sockets in the abstract namespace).</para></listitem>
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<listitem><para>A Varlink service reference starting with the <literal>exec:</literal> string, followed
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by an absolute path of a binary to execute.</para></listitem>
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<listitem><para>A Varlink service reference starting with the <literal>ssh:</literal> string, followed
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by an SSH host specification, followed by <literal>:</literal>, followed by an absolute
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<constant>AF_UNIX</constant> socket path. (This requires OpenSSH 9.4 or newer on the server side,
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abstract namespace sockets are not supported.)</para></listitem>
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</itemizedlist>
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<para>For convenience these two simpler (redundant) service address syntaxes are also supported:</para>
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<itemizedlist>
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<listitem><para>A file system path to an <constant>AF_UNIX</constant> socket, either absolute
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(i.e. begins with <literal>/</literal>) or relative (in which case it must begin with
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<literal>./</literal>).</para></listitem>
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<listitem><para>A file system path to an executable, either absolute or relative (as above, must begin
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with <literal>/</literal>, resp. <literal>./</literal>).</para></listitem>
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</itemizedlist>
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</refsect1>
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<refsect1>
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<title>Commands</title>
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<para>The following commands are understood:</para>
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<variablelist>
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<varlistentry>
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<term><command>info</command> <replaceable>ADDRESS</replaceable></term>
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<listitem><para>Show brief information about the specified service, including vendor name and list of
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implemented interfaces. Expects a service address in one of the formats described above.</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>list-interfaces</command> <replaceable>ADDRESS</replaceable></term>
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<listitem><para>Show list of interfaces implemented by the specified service. Expects a service
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address in one of the formats described above.</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>introspect</command> <replaceable>ADDRESS</replaceable> <replaceable>INTERFACE</replaceable></term>
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<listitem><para>Show interface definition of the specified interface provided by the specified
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service. Expects a service address in one of the formats described above and a Varlink interface
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name.</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>call</command> <replaceable>ADDRESS</replaceable> <replaceable>METHOD</replaceable> [<replaceable>ARGUMENTS</replaceable>]</term>
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<listitem><para>Call the specified method of the specified service. Expects a service address in the
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format described above, a fully qualified Varlink method name, and a JSON arguments object. If the
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arguments object is not specified, it is read from STDIN instead. To pass an empty list of
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parameters, specify the empty object <literal>{}</literal>.</para>
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<para>The reply parameters are written as JSON object to STDOUT.</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>validate-idl</command> [<replaceable>FILE</replaceable>]</term>
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<listitem><para>Reads a Varlink interface definition file, parses and validates it, then outputs it
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with syntax highlighting. This checks for syntax and internal consistency of the interface. Expects a
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file name to read the interface definition from. If omitted reads the interface definition from
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STDIN.</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>help</command></term>
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<listitem><para>Show command syntax help.</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>--more</option></term>
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<listitem><para>When used with <command>call</command>: expect multiple method replies. If this flag is
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set the method call is sent with the <constant>more</constant> flag set, which tells the service to
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generate multiple replies, if needed. The command remains running until the service sends a reply
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message that indicates it is the last in the series. This flag should be set only for method calls
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that support this mechanism.</para>
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<para>If this mode is enabled output is automatically switched to JSON-SEQ mode, so that individual
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reply objects can be easily discerned.</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--collect</option></term>
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<listitem><para>This is similar to <option>--more</option> but collects all responses in a JSON
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array, and prints it, rather than in JSON_SEQ mode.</para>
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<xi:include href="version-info.xml" xpointer="v256"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--oneway</option></term>
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<listitem><para>When used with <command>call</command>: do not expect a method reply. If this flag
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is set the method call is sent with the <constant>oneway</constant> flag set (the command exits
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immediately after), which tells the service not to generate a reply.</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--json=</option><replaceable>MODE</replaceable></term>
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<listitem>
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<para>Selects the JSON output formatting, one of <literal>pretty</literal> (for nicely indented,
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colorized output) or <literal>short</literal> (for terse output with minimal whitespace and no
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newlines), defaults to <literal>short</literal>.</para>
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<xi:include href="version-info.xml" xpointer="v255"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-j</option></term>
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<listitem>
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<para>Equivalent to <option>--json=pretty</option> when invoked interactively from a terminal. Otherwise
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equivalent to <option>--json=short</option>, in particular when the output is piped to some other
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program.</para>
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<xi:include href="version-info.xml" xpointer="v255"/>
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</listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="no-pager" />
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<example>
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<title>Investigating a Service</title>
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<para>The following three commands inspect the <literal>io.systemd.Resolve</literal> service
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implemented by
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<citerefentry><refentrytitle>systemd-resolved.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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listing general service information and implemented interfaces, and then displaying the interface
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definition of its primary interface:</para>
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<programlisting>$ varlinkctl info /run/systemd/resolve/io.systemd.Resolve
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Vendor: The systemd Project
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Product: systemd (systemd-resolved)
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Version: 254 (254-1522-g4790521^)
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URL: https://systemd.io/
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Interfaces: io.systemd
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io.systemd.Resolve
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org.varlink.service
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$ varlinkctl list-interfaces /run/systemd/resolve/io.systemd.Resolve
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io.systemd
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io.systemd.Resolve
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org.varlink.service
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$ varlinkctl introspect /run/systemd/resolve/io.systemd.Resolve io.systemd.Resolve
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interface io.systemd.Resolve
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type ResolvedAddress(
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ifindex: ?int,
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…</programlisting>
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<para>(Interface definition has been truncated in the example above, in the interest of brevity.)</para>
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</example>
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<example>
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<title>Invoking a Method</title>
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<para>The following command resolves a hostname via <citerefentry><refentrytitle>systemd-resolved.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>'s <function>ResolveHostname</function> method call.</para>
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<programlisting>$ varlinkctl call /run/systemd/resolve/io.systemd.Resolve io.systemd.Resolve.ResolveHostname '{"name":"systemd.io","family":2}' -j
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{
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"addresses" : [
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{
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"ifindex" : 2,
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"family" : 2,
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"address" : [
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185,
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199,
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111,
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153
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]
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}
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],
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"name" : "systemd.io",
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"flags" : 1048577
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}</programlisting>
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</example>
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<example>
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<title>Investigating a Service Executable</title>
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<para>The following command inspects the <filename>/usr/lib/systemd/systemd-pcrextend</filename>
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executable and the IPC APIs it provides. It then invokes a method on it:</para>
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<programlisting># varlinkctl info /usr/lib/systemd/systemd-pcrextend
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Vendor: The systemd Project
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Product: systemd (systemd-pcrextend)
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Version: 254 (254-1536-g97734fb)
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URL: https://systemd.io/
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Interfaces: io.systemd
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io.systemd.PCRExtend
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org.varlink.service
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# varlinkctl introspect /usr/lib/systemd/systemd-pcrextend io.systemd.PCRExtend
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interface io.systemd.PCRExtend
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method Extend(
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pcr: int,
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text: ?string,
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data: ?string
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) -> ()
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# varlinkctl call /usr/lib/systemd/systemd-pcrextend io.systemd.PCRExtend.Extend '{"pcr":15,"text":"foobar"}'
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{}</programlisting>
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</example>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para><simplelist type="inline">
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<member><citerefentry><refentrytitle>busctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><ulink url="https://varlink.org/">Varlink</ulink></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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