143
137
using TLS with an OpenPGP key to ensure authenticity and
144
138
confidentiality. This client program keeps running, trying all
145
139
servers on the network, until it receives a satisfactory reply
146
or a TERM signal. After all servers have been tried, all
147
servers are periodically retried. If no servers are found it
148
will wait indefinitely for new servers to appear.
151
The network interface is selected like this: If an interface is
152
specified using the <option>--interface</option> option, that
153
interface is used. Otherwise, <command>&COMMANDNAME;</command>
154
will choose any interface that is up and running and is not a
155
loopback interface, is not a point-to-point interface, is
156
capable of broadcasting and does not have the NOARP flag (see
157
<citerefentry><refentrytitle>netdevice</refentrytitle>
158
<manvolnum>7</manvolnum></citerefentry>). (If the
159
<option>--connect</option> option is used, point-to-point
160
interfaces and non-broadcast interfaces are accepted.) If no
161
acceptable interfaces are found, re-run the check but without
162
the <quote>up and running</quote> requirement, and manually take
163
the selected interface up (and later take it down on program
167
Before a network interface is selected, all <quote>network
168
hooks</quote> are run; see <xref linkend="network-hooks"/>.
140
or a TERM signal is received. If no servers are found, or after
141
all servers have been tried, it waits indefinitely for new
171
145
This program is not meant to be run directly; it is really meant
330
303
>SECONDS</replaceable></option></term>
333
All Mandos servers are tried repeatedly until a password
334
is received. This value specifies, in seconds, how long
335
between each successive try <emphasis>for the same
336
server</emphasis>. The default is 10 seconds.
342
<term><option>--network-hook-dir=<replaceable
343
>DIR</replaceable></option></term>
346
Network hook directory. The default directory is
347
<quote><filename class="directory"
348
>/lib/mandos/network-hooks.d</filename></quote>.
306
All Mandos servers servers are tried repeatedly until a
307
password is received. This value specifies, in seconds,
308
how long between each successive try <emphasis>for the
309
same server</emphasis>. The default is 10 seconds.
448
<refsect1 id="network-hooks">
449
<title>NETWORK HOOKS</title>
451
If a network interface like a bridge or tunnel is required to
452
find a Mandos server, this requires the interface to be up and
453
running before <command>&COMMANDNAME;</command> starts looking
454
for Mandos servers. This can be accomplished by creating a
455
<quote>network hook</quote> program, and placing it in a special
459
Before the network is used (and again before program exit), any
460
runnable programs found in the network hook directory are run
461
with the argument <quote><literal>start</literal></quote> or
462
<quote><literal>stop</literal></quote>. This should bring up or
463
down, respectively, any network interface which
464
<command>&COMMANDNAME;</command> should use.
466
<refsect2 id="hook-requirements">
467
<title>REQUIREMENTS</title>
469
A network hook must be an executable file, and its name must
470
consist entirely of upper and lower case letters, digits,
471
underscores, and hyphens.
474
A network hook will receive one argument, which can be one of
479
<term><literal>start</literal></term>
482
This should make the network hook create (if necessary)
483
and bring up a network interface.
488
<term><literal>stop</literal></term>
491
This should make the network hook take down a network
492
interface, and delete it if it did not exist previously.
497
<term><literal>files</literal></term>
500
This should make the network hook print, <emphasis>on
501
separate lines</emphasis>, all the files needed for it
502
to run. (These files will be copied into the initial
503
RAM filesystem.) Intended use is for a network hook
504
which is a shell script to print its needed binaries.
507
It is not necessary to print any non-executable files
508
already in the network hook directory, these will be
509
copied implicitly if they otherwise satisfy the name
516
The network hook will be provided with a number of environment
521
<term><envar>MANDOSNETHOOKDIR</envar></term>
524
The network hook directory, specified to
525
<command>&COMMANDNAME;</command> by the
526
<option>--network-hook-dir</option> option. Note: this
527
should <emphasis>always</emphasis> be used by the
528
network hook to refer to itself or any files it may
534
<term><envar>DEVICE</envar></term>
537
The network interface, as specified to
538
<command>&COMMANDNAME;</command> by the
539
<option>--interface</option> option. If this is not the
540
interface a hook will bring up, there is no reason for a
546
<term><envar>MODE</envar></term>
549
This will be the same as the first argument;
550
i.e. <quote><literal>start</literal></quote>,
551
<quote><literal>stop</literal></quote>, or
552
<quote><literal>files</literal></quote>.
557
<term><envar>VERBOSITY</envar></term>
560
This will be the <quote><literal>1</literal></quote> if
561
the <option>--debug</option> option is passed to
562
<command>&COMMANDNAME;</command>, otherwise
563
<quote><literal>0</literal></quote>.
568
<term><envar>DELAY</envar></term>
571
This will be the same as the <option>--delay</option>
572
option passed to <command>&COMMANDNAME;</command>.
578
A hook may not read from standard input, and should be
579
restrictive in printing to standard output or standard error
580
unless <varname>VERBOSITY</varname> is
581
<quote><literal>1</literal></quote>.
586
407
<refsect1 id="files">
587
408
<title>FILES</title>