forked from opnsense/dhcp6c
-
Notifications
You must be signed in to change notification settings - Fork 0
/
dhcp6c.8
251 lines (251 loc) · 6.99 KB
/
dhcp6c.8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
.\" $KAME: dhcp6c.8,v 1.36 2005/03/17 05:27:01 suz Exp $
.\"
.\" Copyright (C) 1998 and 1999 WIDE Project.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the project nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd May 11, 2020
.Dt DHCP6C 8
.Os KAME
.Sh NAME
.Nm dhcp6c
.Nd DHCPv6 client daemon
.\"
.Sh SYNOPSIS
.Nm
.Op Fl c Ar configfile
.Op Fl Ddfin
.Op Fl p Ar pid-file
.Op Ar interfaces...
.\"
.Sh DESCRIPTION
.Nm
works as a DHCPv6 client and gets information from DHCPv6 servers
to configure the specified
.Ar interface .
Multiple
.Ar interfaces
can be specified separated by spaces or tabs,
in which case
.Nm
will work on all the interfaces simultaneously.
.Pp
The command line options are:
.Bl -tag -width indent
.\"
.It Fl c Ar configfile
Use
.Ar configfile
as the configuration file.
.It Fl d
Print debugging messages.
.It Fl D
Even more debugging information is printed.
.It Fl f
Foreground mode (useful when debugging).
Although
.Nm
usually prints warning, debugging, or error messages to
.Xr syslog 8 ,
it prints the messages to standard error if this option is
specified.
.It Fl i
Info-req mode. In this mode, stateless DHCPv6 is executed with the folllowing configuration, and the obtained info is written to stdout. After this output,
.Nm
is terminated. (suits for a use in shell-script etc).
.Bd -literal -offset
interface (interface given in the argument) {
information-only;
script (a script which displays the received information to stdout);
};
.Ed
.Pp
Since the configuration is internally generated, you cannot provide a configuration in this mode. If you want to have different actions for the stateless DHCPv6 information, you should write an appropriate configuration and invoke
.Nm
without this option.
.It Fl n
Prevent Release message from being sent to DHCPv6 server when
.Nm
stops.
This is useful for preventing a new address from being configured by
the DHCPv6 server when restarting the DHCPv6 client.
.It Fl p Ar pid-file
Use
.Ar pid-file
to dump the process ID of
.Nm .
.El
.Pp
The program will daemonize itself on invocation unless the
.Fl f
or
.Fl i
option is specified.
.Pp
Upon receipt of a
.Dv SIGHUP ,
.Dv SIGTERM ,
or
.Dv SIGUSR1
signal,
.Nm
will remove all stateful resources from the system.
After that,
.Dv SIGHUP
reinitializes the daemon,
and
.Dv SIGTERM
stops the daemon.
In both cases,
DHCPv6 Release message will be sent to release resources
assigned from servers.
.Dv SIGUSR1
stops the daemon as
.Dv SIGTERM
does though DHCPv6 Release message will not be sent.
.\"
.Sh FILES
.Bl -tag -width /usr/local/etc/dhcp6c.conf -compact
.It Pa /var/run/dhcp6c.pid
is the default file that contains pid of the currently running
.Nm dhcp6c .
.It Pa /usr/local/etc/dhcp6c.conf
is the default configuration file.
.It Pa /var/db/dhcp6c_duid
is the file to store the client's DUID.
.El
.Sh Configuration Script
When
.Nm
receives a reply message,
it will invoke a supplementary configuration script specified in the
.Xr dhcp6c.conf 5
file.
The daemon will provide the script with configuration parameters as
environment variables,
which include:
.Pp
.Bl -tag -width Ds -compact
.It Li PDINFO
The delegated prefix for the interface.
Make sure to use a separate script for each interface when using
multiple interfaces at once.
.It Li REASON
The reason why the script is invoked.
One of the following values is set based on a message
which the client sent before the
.Li REPLY
message arrives:
.Bl -tag -width "INFOREQ" -compact -offset indent
.It Li INFOREQ
The client sent an
.Li INFORMATION REQUEST
message.
.It Li REQUEST
The client sent a
.Li REQUEST
message.
.It Li RENEW
The client sent a
.Li RENEW
message.
.It Li REBIND
The client sent a
.Li REBIND
message.
.It Li RELEASE
The client sent a
.Li RELEASE
message.
.It Li EXIT
This happens when
.Nm
exits.
.El
.It Ic new_domain_name_servers
A list of available DNS servers,
each of which is an IPv6 numeric address and is separated by a white
space character.
.It Ic new_domain_name
A list of DNS names,
which provides DNS name search path.
.It Ic new_ntp_servers
A list of available NTP servers,
each of which is an IPv6 numeric address and is separated by a white
space character.
.It Ic new_sip_servers
A list of available SIP server addresses,
each of which is an IPv6 numeric address and is separated by a white
space character.
.It Ic new_sip_name
A list of SIP server domain names.
.It Ic new_nis_servers
A list of available NIS server addresses,
each of which is an IPv6 numeric address and is separated by a white
space character.
.It Ic new_nis_name
A list of NIS domain names.
.It Ic new_nisp_servers
A list of available NIS+ server addresses,
each of which is an IPv6 numeric address and is separated by a white
space character.
.It Ic new_nisp_name
A list of NIS+ domain names.
.It Ic new_bcmcs_servers
A list of available BCMCS server addresses,
each of which is an IPv6 numeric address and is separated by a white
space character.
.It Ic new_bcmcs_name
A list of BCMCS server domain names.
.El
.Pp
Note that the daemon does not always provide all the parameters.
It sets an environment variable only when the corresponding
configuration parameter is provided by the DHCPv6 server.
.\"
.Sh SEE ALSO
.Xr daemon 3 ,
.Xr dhcp6c.conf 5 .
.Rs
.%A Ralph Droms, Editor
.%D 2003
.%T Dynamic Host Configuration Protocol for IPv6 (DHCPv6)
.%R RFC 3315
.Re
.\"
.Sh HISTORY
The
.Nm
command first appeared in WIDE/KAME IPv6 protocol stack kit.
.\"
.Sh BUGS
.Nm
is incomplete and violates DHCPv6 protocol spec, in several aspects.
In particular, temporary address assignment is intentionally omitted.
.Pp
Information Refresh Time Option is not recognied in Info-req mode, since
.Nm
terminates after it receives a REPLY message.