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<command>&COMMANDNAME;</command> is a client program that
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123
communicates with <citerefentry><refentrytitle
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124
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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to get a password. In slightly more detail, this client program
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brings up network interfaces, uses the interfaces’ IPv6
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link-local addresses to get network connectivity, uses Zeroconf
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to find servers on the local network, and communicates with
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servers using TLS with an OpenPGP key to ensure authenticity and
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confidentiality. This client program keeps running, trying all
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servers on the network, until it receives a satisfactory reply
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or a TERM signal. After all servers have been tried, all
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servers are periodically retried. If no servers are found it
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will wait indefinitely for new servers to appear.
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The network interfaces are selected like this: If any interfaces
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are specified using the <option>--interface</option> option,
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those interface are used. Otherwise,
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<command>&COMMANDNAME;</command> will use all interfaces that
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are not loopback interfaces, are not point-to-point interfaces,
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are capable of broadcasting and do not have the NOARP flag (see
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<citerefentry><refentrytitle>netdevice</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry>). (If the
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<option>--connect</option> option is used, point-to-point
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interfaces and non-broadcast interfaces are accepted.) If any
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used interfaces are not up and running, they are first taken up
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(and later taken down again on program exit).
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Before network interfaces are selected, all <quote>network
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hooks</quote> are run; see <xref linkend="network-hooks"/>.
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to get a password. It uses IPv6 link-local addresses to get
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network connectivity, Zeroconf to find servers, and TLS with an
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OpenPGP key to ensure authenticity and confidentiality. It
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keeps running, trying all servers on the network, until it
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receives a satisfactory reply or a TERM signal is received.
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This program is not meant to be run directly; it is really meant
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<term><option>--interface=<replaceable
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>NAME</replaceable></option></term>
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<term><option>--interface=
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<replaceable>NAME</replaceable></option></term>
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<replaceable>NAME</replaceable></option></term>
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Comma separated list of network interfaces that will be
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brought up and scanned for Mandos servers to connect to.
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The default is the empty string, which will automatically
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use all appropriate interfaces.
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Network interface that will be brought up and scanned for
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Mandos servers to connect to. The default it
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<quote><literal>eth0</literal></quote>.
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If the <option>--connect</option> option is used, this
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specifies the interface to use to connect to the address
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Note that since this program will normally run in the
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initial RAM disk environment, the interface must be an
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interface which exists at that stage. Thus, the interface
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can normally not be a pseudo-interface such as
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<quote>br0</quote> or <quote>tun0</quote>; such interfaces
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will not exist until much later in the boot process, and
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can not be used by this program, unless created by a
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<quote>network hook</quote> — see <xref
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linkend="network-hooks"/>.
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<replaceable>NAME</replaceable> can be the string
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<quote><literal>none</literal></quote>; this will not use
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any specific interface, and will not bring up an interface
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on startup. This is not recommended, and only meant for
314
<term><option>--delay=<replaceable
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>SECONDS</replaceable></option></term>
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After bringing a network interface up, the program waits
319
for the interface to arrive in a <quote>running</quote>
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state before proceeding. During this time, the kernel log
321
level will be lowered to reduce clutter on the system
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console, alleviating any other plugins which might be
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using the system console. This option sets the upper
324
limit of seconds to wait. The default is 2.5 seconds.
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<term><option>--retry=<replaceable
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>SECONDS</replaceable></option></term>
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All Mandos servers are tried repeatedly until a password
335
is received. This value specifies, in seconds, how long
336
between each successive try <emphasis>for the same
337
server</emphasis>. The default is 10 seconds.
343
<term><option>--network-hook-dir=<replaceable
344
>DIR</replaceable></option></term>
347
Network hook directory. The default directory is
348
<quote><filename class="directory"
349
>/lib/mandos/network-hooks.d</filename></quote>.
355
256
<term><option>--debug</option></term>
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<refsect1 id="network-hooks">
450
<title>NETWORK HOOKS</title>
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If a network interface like a bridge or tunnel is required to
453
find a Mandos server, this requires the interface to be up and
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running before <command>&COMMANDNAME;</command> starts looking
455
for Mandos servers. This can be accomplished by creating a
456
<quote>network hook</quote> program, and placing it in a special
460
Before the network is used (and again before program exit), any
461
runnable programs found in the network hook directory are run
462
with the argument <quote><literal>start</literal></quote> or
463
<quote><literal>stop</literal></quote>. This should bring up or
464
down, respectively, any network interface which
465
<command>&COMMANDNAME;</command> should use.
467
<refsect2 id="hook-requirements">
468
<title>REQUIREMENTS</title>
470
A network hook must be an executable file, and its name must
471
consist entirely of upper and lower case letters, digits,
472
underscores, periods, and hyphens.
475
A network hook will receive one argument, which can be one of
480
<term><literal>start</literal></term>
483
This should make the network hook create (if necessary)
484
and bring up a network interface.
489
<term><literal>stop</literal></term>
492
This should make the network hook take down a network
493
interface, and delete it if it did not exist previously.
498
<term><literal>files</literal></term>
501
This should make the network hook print, <emphasis>one
502
file per line</emphasis>, all the files needed for it to
503
run. (These files will be copied into the initial RAM
504
filesystem.) Typical use is for a network hook which is
505
a shell script to print its needed binaries.
508
It is not necessary to print any non-executable files
509
already in the network hook directory, these will be
510
copied implicitly if they otherwise satisfy the name
516
<term><literal>modules</literal></term>
519
This should make the network hook print, <emphasis>on
520
separate lines</emphasis>, all the kernel modules needed
521
for it to run. (These modules will be copied into the
522
initial RAM filesystem.) For instance, a tunnel
524
<quote><literal>tun</literal></quote> module.
530
The network hook will be provided with a number of environment
535
<term><envar>MANDOSNETHOOKDIR</envar></term>
538
The network hook directory, specified to
539
<command>&COMMANDNAME;</command> by the
540
<option>--network-hook-dir</option> option. Note: this
541
should <emphasis>always</emphasis> be used by the
542
network hook to refer to itself or any files in the hook
543
directory it may require.
548
<term><envar>DEVICE</envar></term>
551
The network interfaces, as specified to
552
<command>&COMMANDNAME;</command> by the
553
<option>--interface</option> option, combined to one
554
string and separated by commas. If this is set, and
555
does not contain the interface a hook will bring up,
556
there is no reason for a hook to continue.
561
<term><envar>MODE</envar></term>
564
This will be the same as the first argument;
565
i.e. <quote><literal>start</literal></quote>,
566
<quote><literal>stop</literal></quote>,
567
<quote><literal>files</literal></quote>, or
568
<quote><literal>modules</literal></quote>.
573
<term><envar>VERBOSITY</envar></term>
576
This will be the <quote><literal>1</literal></quote> if
577
the <option>--debug</option> option is passed to
578
<command>&COMMANDNAME;</command>, otherwise
579
<quote><literal>0</literal></quote>.
584
<term><envar>DELAY</envar></term>
587
This will be the same as the <option>--delay</option>
588
option passed to <command>&COMMANDNAME;</command>. Is
589
only set if <envar>MODE</envar> is
590
<quote><literal>start</literal></quote> or
591
<quote><literal>stop</literal></quote>.
596
<term><envar>CONNECT</envar></term>
599
This will be the same as the <option>--connect</option>
600
option passed to <command>&COMMANDNAME;</command>. Is
601
only set if <option>--connect</option> is passed and
602
<envar>MODE</envar> is
603
<quote><literal>start</literal></quote> or
604
<quote><literal>stop</literal></quote>.
610
A hook may not read from standard input, and should be
611
restrictive in printing to standard output or standard error
612
unless <varname>VERBOSITY</varname> is
613
<quote><literal>1</literal></quote>.
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<refsect1 id="files">
619
349
<title>FILES</title>