blob: 36b4c5d5c1ef1d5d1f13300b2941b76e283780c3 (
plain) (
blame)
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
|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.dhcpd;
stateDir = "/var/lib/dhcp"; # Don't use /var/state/dhcp; not FHS-compliant.
configFile = if cfg.configFile != null then cfg.configFile else pkgs.writeText "dhcpd.conf"
''
default-lease-time 600;
max-lease-time 7200;
authoritative;
ddns-update-style interim;
log-facility local1; # see dhcpd.nix
${cfg.extraConfig}
${lib.concatMapStrings
(machine: ''
host ${machine.hostName} {
hardware ethernet ${machine.ethernetAddress};
fixed-address ${machine.ipAddress};
}
'')
cfg.machines
}
'';
in
{
###### interface
options = {
services.dhcpd = {
enable = mkOption {
default = false;
description = "
Whether to enable the DHCP server.
";
};
extraConfig = mkOption {
default = "";
example = ''
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.1.255;
option routers 192.168.1.5;
option domain-name-servers 130.161.158.4, 130.161.33.17, 130.161.180.1;
option domain-name "example.org";
subnet 192.168.1.0 netmask 255.255.255.0 {
range 192.168.1.100 192.168.1.200;
}
'';
description = "
Extra text to be appended to the DHCP server configuration
file. Currently, you almost certainly need to specify
something here, such as the options specifying the subnet
mask, DNS servers, etc.
";
};
extraFlags = mkOption {
default = "";
example = "-6";
description = "
Additional command line flags to be passed to the dhcpd daemon.
";
};
configFile = mkOption {
default = null;
description = "
The path of the DHCP server configuration file. If no file
is specified, a file is generated using the other options.
";
};
interfaces = mkOption {
default = ["eth0"];
description = "
The interfaces on which the DHCP server should listen.
";
};
machines = mkOption {
default = [];
example = [
{ hostName = "foo";
ethernetAddress = "00:16:76:9a:32:1d";
ipAddress = "192.168.1.10";
}
{ hostName = "bar";
ethernetAddress = "00:19:d1:1d:c4:9a";
ipAddress = "192.168.1.11";
}
];
description = "
A list mapping ethernet addresses to IP addresses for the
DHCP server.
";
};
};
};
###### implementation
config = mkIf config.services.dhcpd.enable {
users = {
extraUsers.dhcpd = {
uid = config.ids.uids.dhcpd;
description = "DHCP daemon user";
};
};
systemd.services.dhcpd =
{ description = "DHCP server";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
path = [ pkgs.dhcp ];
preStart =
''
mkdir -m 755 -p ${stateDir}
touch ${stateDir}/dhcpd.leases
mkdir -m 755 -p /run/dhcpd
chown dhcpd /run/dhcpd
'';
serviceConfig =
{ ExecStart = "@${pkgs.dhcp}/sbin/dhcpd dhcpd"
+ " -pf /run/dhcpd/dhcpd.pid -cf ${configFile}"
+ " -lf ${stateDir}/dhcpd.leases -user dhcpd -group nogroup"
+ " ${cfg.extraFlags}"
+ " ${toString cfg.interfaces}";
Restart = "always";
Type = "forking";
PIDFile = "/run/dhcpd/dhcpd.pid";
};
};
};
}
|