139
127
communicates with <citerefentry><refentrytitle
140
128
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>
141
129
to get a password. In slightly more detail, this client program
142
brings up network interfaces, uses the interfaces’ IPv6
143
link-local addresses to get network connectivity, uses Zeroconf
144
to find servers on the local network, and communicates with
145
servers using TLS with an OpenPGP key to ensure authenticity and
130
brings up a network interface, uses the interface’s IPv6
131
link-local address to get network connectivity, uses Zeroconf to
132
find servers on the local network, and communicates with servers
133
using TLS with an OpenPGP key to ensure authenticity and
146
134
confidentiality. This client program keeps running, trying all
147
135
servers on the network, until it receives a satisfactory reply
148
or a TERM signal. After all servers have been tried, all
149
servers are periodically retried. If no servers are found it
150
will wait indefinitely for new servers to appear.
153
The network interfaces are selected like this: If any interfaces
154
are specified using the <option>--interface</option> option,
155
those interface are used. Otherwise,
156
<command>&COMMANDNAME;</command> will use all interfaces that
157
are not loopback interfaces, are not point-to-point interfaces,
158
are capable of broadcasting and do not have the NOARP flag (see
159
<citerefentry><refentrytitle>netdevice</refentrytitle>
160
<manvolnum>7</manvolnum></citerefentry>). (If the
161
<option>--connect</option> option is used, point-to-point
162
interfaces and non-broadcast interfaces are accepted.) If any
163
used interfaces are not up and running, they are first taken up
164
(and later taken down again on program exit).
167
Before network interfaces are selected, all <quote>network
168
hooks</quote> are run; see <xref linkend="network-hooks"/>.
136
or a TERM signal is received. If no servers are found, or after
137
all servers have been tried, it waits indefinitely for new
171
141
This program is not meant to be run directly; it is really meant
245
214
Note that since this program will normally run in the
246
215
initial RAM disk environment, the interface must be an
247
216
interface which exists at that stage. Thus, the interface
248
can normally not be a pseudo-interface such as
249
<quote>br0</quote> or <quote>tun0</quote>; such interfaces
250
will not exist until much later in the boot process, and
251
can not be used by this program, unless created by a
252
<quote>network hook</quote> — see <xref
253
linkend="network-hooks"/>.
256
<replaceable>NAME</replaceable> can be the string
257
<quote><literal>none</literal></quote>; this will not use
258
any specific interface, and will not bring up an interface
259
on startup. This is not recommended, and only meant for
217
can not be a pseudo-interface such as <quote>br0</quote>
218
or <quote>tun0</quote>; such interfaces will not exist
219
until much later in the boot process, and can not be used
449
<refsect1 id="network-hooks">
450
<title>NETWORK HOOKS</title>
452
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
454
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>.
618
382
<refsect1 id="files">
619
383
<title>FILES</title>