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2 | |
2 | |
3 | gvpe.conf - configuration file for the GNU VPE daemon |
3 | gvpe.conf - configuration file for the GNU VPE daemon |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
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7 | # global options for all nodes |
7 | udp-port = 407 |
8 | udp-port = 407 |
8 | mtu = 1492 |
9 | mtu = 1492 |
9 | ifname = vpn0 |
10 | ifname = vpn0 |
10 | |
11 | |
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12 | # first node is named branch1 and is at 1.2.3.4 |
11 | node = branch1 |
13 | node = branch1 |
12 | hostname = 1.2.3.4 |
14 | hostname = 1.2.3.4 |
13 | |
15 | |
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16 | # second node uses dns to resolve the address |
14 | node = branch2 |
17 | node = branch2 |
15 | hostname = www.example.net |
18 | hostname = www.example.net |
16 | udp-port = 500 # this host uses a different udp-port |
19 | udp-port = 500 # this host uses a different udp-port |
17 | |
20 | |
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21 | # third node has no fixed ip address |
18 | node = branch3 |
22 | node = branch3 |
19 | connect = ondemand |
23 | connect = ondemand |
20 | |
24 | |
21 | =head1 DESCRIPTION |
25 | =head1 DESCRIPTION |
22 | |
26 | |
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24 | = value> pairs. Empty lines are ignored. Comments start with a C<#> and |
28 | = value> pairs. Empty lines are ignored. Comments start with a C<#> and |
25 | extend to the end of the line. They can be used on their own lines, or |
29 | extend to the end of the line. They can be used on their own lines, or |
26 | after any directives. Whitespace is allowed around the C<=> sign or after |
30 | after any directives. Whitespace is allowed around the C<=> sign or after |
27 | values, but not within the variable names or values themselves. |
31 | values, but not within the variable names or values themselves. |
28 | |
32 | |
29 | The only exception to the above is the "on" directive that can prefix any |
33 | All settings are applied "in order", that is, later settings of the same |
30 | C<name = value> setting and will only "execute" it on the named node, or |
34 | variable overwrite earlier ones. |
31 | (if the nodename starts with "!") on all nodes except the named one. |
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32 | |
35 | |
33 | name = value |
36 | The only exceptions to the above are the following directives: |
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37 | |
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38 | =over 4 |
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39 | |
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40 | =item node nodename |
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41 | |
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42 | Introduces a node section. The nodename is used to select the right |
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43 | configuration section and is the same string as is passed as an argument |
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44 | to the gvpe daemon. |
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45 | |
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46 | Multiple C<node> statements with the same node name are supported and will |
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47 | be merged together. |
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48 | |
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49 | =item global |
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50 | |
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51 | This statement switches back to the global section, which is mainly |
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52 | useful if you want to include a second config file, e..g for local |
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53 | customisations. To do that, simply include this at the very end of your |
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54 | config file: |
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55 | |
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56 | global |
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57 | include local.conf |
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58 | |
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59 | =item on nodename ... |
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60 | |
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61 | =item on !nodename ... |
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62 | |
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63 | You can prefix any configuration directive with C<on> and a nodename. GVPE |
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64 | will will only "execute" it on the named node, or (if the nodename starts |
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65 | with C<!>) on all nodes except the named one. |
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66 | |
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67 | Example: set the MTU to C<1450> everywhere, C<loglevel> to C<noise> on |
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68 | C<branch1>, and C<connect> to C<ondemand> everywhere but on branch2. |
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69 | |
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70 | mtu = 1450 |
34 | on branch1 loglevel = noise |
71 | on branch1 loglevel = noise |
35 | on !branch2 connect = ondemand |
72 | on !branch2 connect = ondemand |
36 | |
73 | |
37 | All settings are executed "in order", that is, later settings of the same |
74 | =item include relative-or-absolute-path |
38 | variable overwrite earlier ones. |
75 | |
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76 | Reads the specified file (the path must not contain whitespace or C<=> |
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77 | characters) and evaluate all config directives in it as if they were |
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78 | spelled out in place of the C<include> directive. |
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79 | |
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80 | The path is a printf format string, that is, you must escape any C<%> |
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81 | by doubling it, and you can have a single C<%s> inside, which will be |
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82 | replaced by the current nodename. |
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83 | |
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84 | Relative paths are interpreted relative to the GVPE config directory. |
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85 | |
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86 | Example: include the file F<local.conf> in the config directory on every |
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87 | node. |
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88 | |
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89 | include local.conf |
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90 | |
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91 | Example: include a file F<conf/>nodenameF<.conf> |
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92 | |
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93 | include conf/%s.conf |
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94 | |
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95 | =back |
39 | |
96 | |
40 | =head1 ANATOMY OF A CONFIG FILE |
97 | =head1 ANATOMY OF A CONFIG FILE |
41 | |
98 | |
42 | Usually, a config file starts with global settings (like the udp port to |
99 | Usually, a config file starts with a few global settings (like the UDP |
43 | listen on), followed by node-specific sections that begin with a C<node = |
100 | port to listen on), followed by node-specific sections that begin with a |
44 | nickname> line. |
101 | C<node = nickname> line. |
45 | |
102 | |
46 | Every node that is part of the network must have a section that starts |
103 | Every node that is part of the network must have a section that starts |
47 | with C<node = nickname>. The number and order of the nodes is important |
104 | with C<node = nickname>. The number and order of the nodes is important |
48 | and must be the same on all hosts. It is not uncommon for node sections to |
105 | and must be the same on all nodes. It is not uncommon for node sections to |
49 | be completely empty - if the default values are right. |
106 | be completely empty - if the default values are right. |
50 | |
107 | |
51 | Node-specific settings can be used at any time. If used before the first |
108 | Node-specific settings can be used at any time. If used before the first |
52 | node section they will set the default values for all following nodes. |
109 | node section they will set the default values for all following nodes. |
53 | |
110 | |
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60 | values on different nodes using C<on>), but will affect the behaviour of |
117 | values on different nodes using C<on>), but will affect the behaviour of |
61 | the gvpe daemon and all connections it creates. |
118 | the gvpe daemon and all connections it creates. |
62 | |
119 | |
63 | =over 4 |
120 | =over 4 |
64 | |
121 | |
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122 | =item chroot = path or / |
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123 | |
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124 | Tells GVPE to chroot(2) to the specified path after reading all necessary |
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125 | files, binding to sockets and running the C<if-up> script, but before |
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126 | running C<node-up> or any other scripts. |
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127 | |
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128 | The special path F</> instructs GVPE to create (and remove) an empty |
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129 | temporary directory to use as new root. This is most secure, but makes it |
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130 | impossible to use any scripts other than the C<if-up> one. |
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131 | |
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132 | =item chuid = numerical-uid |
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133 | |
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134 | =item chgid = numerical-gid |
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135 | |
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136 | These two options tell GVPE to change to the given user and/or group id |
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137 | after reading all necessary files, binding to sockets and running the |
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138 | C<if-up> script. |
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139 | |
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140 | Other scripts, such as C<node-up>, are run with the new user id or group id. |
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141 | |
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142 | =item chuser = username |
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143 | |
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144 | Alternative to C<chuid> and C<chgid>: Sets both C<chuid> and C<chgid> |
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145 | to the user and (primary) group ids of the specified user (for example, |
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146 | C<nobody>). |
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147 | |
65 | =item dns-forw-host = hostname/ip |
148 | =item dns-forw-host = hostname/ip |
66 | |
149 | |
67 | The dns server to forward dns requests to for the DNS tunnel protocol |
150 | The DNS server to forward DNS requests to for the DNS tunnel protocol |
68 | (default: C<127.0.0.1>, changing it is highly recommended). |
151 | (default: C<127.0.0.1>, changing it is highly recommended). |
69 | |
152 | |
70 | =item dns-forw-port = port-number |
153 | =item dns-forw-port = port-number |
71 | |
154 | |
72 | The port where the C<dns-forw-host> is to be contacted (default: C<53>, |
155 | The port where the C<dns-forw-host> is to be contacted (default: C<53>, |
73 | which is fine in most cases). |
156 | which is fine in most cases). |
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157 | |
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158 | =item dns-case-preserving = yes|true|on | no|false|off |
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159 | |
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160 | Sets whether the DNS transport forwarding server preserves case (DNS |
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161 | servers have to, but some access systems are even more broken than others) |
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162 | (default: true). |
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163 | |
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164 | Normally, when the forwarding server changes the case of domain names then |
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165 | GVPE will automatically set this to false. |
74 | |
166 | |
75 | =item dns-max-outstanding = integer-number-of-requests |
167 | =item dns-max-outstanding = integer-number-of-requests |
76 | |
168 | |
77 | The maximum number of outstanding DNS transport requests |
169 | The maximum number of outstanding DNS transport requests |
78 | (default: C<100>). GVPE will never issue more requests then the given |
170 | (default: C<100>). GVPE will never issue more requests then the given |
79 | limit without receiving replies. In heavily overloaded situations it might |
171 | limit without receiving replies. In heavily overloaded situations it might |
80 | help to set this to a low number (e.g. C<3> or even C<1>) to limit the |
172 | help to set this to a low number (e.g. C<3> or even C<1>) to limit the |
81 | number of parallel requests. |
173 | number of parallel requests. |
82 | |
174 | |
83 | The default should be working ok for most links. |
175 | The default should be working OK for most links. |
84 | |
176 | |
85 | =item dns-overlap-factor = float |
177 | =item dns-overlap-factor = float |
86 | |
178 | |
87 | The DNS transport uses the minimum request latency (B<min_latency>) seen |
179 | The DNS transport uses the minimum request latency (B<min_latency>) seen |
88 | during a connection as it's timing base. This factor (default: C<0.5>, |
180 | during a connection as it's timing base. This factor (default: C<0.5>, |
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91 | request might be generated every B<min_latency> seconds, which means on |
183 | request might be generated every B<min_latency> seconds, which means on |
92 | average there should only ever be one outstanding request. A factor of |
184 | average there should only ever be one outstanding request. A factor of |
93 | C<0.5> means that GVPE will send requests twice as often as the minimum |
185 | C<0.5> means that GVPE will send requests twice as often as the minimum |
94 | latency measured. |
186 | latency measured. |
95 | |
187 | |
96 | For congested or picky dns forwarders you could use a value nearer to or |
188 | For congested or picky DNS forwarders you could use a value nearer to or |
97 | exceeding C<1>. |
189 | exceeding C<1>. |
98 | |
190 | |
99 | The default should be working ok for most links. |
191 | The default should be working OK for most links. |
100 | |
192 | |
101 | =item dns-send-interval = send-interval-in-seconds |
193 | =item dns-send-interval = send-interval-in-seconds |
102 | |
194 | |
103 | The minimum send interval (= maximum rate) that the DNS transport will |
195 | The minimum send interval (= maximum rate) that the DNS transport will |
104 | use to send new DNS requests. GVPE will not exceed this rate even when |
196 | use to send new DNS requests. GVPE will not exceed this rate even when |
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106 | not send more than 100 DNS requests per connection per second. For |
198 | not send more than 100 DNS requests per connection per second. For |
107 | high-bandwidth links you could go lower, e.g. to C<0.001> or so. For |
199 | high-bandwidth links you could go lower, e.g. to C<0.001> or so. For |
108 | congested or rate-limited links, you might want to go higher, say C<0.1>, |
200 | congested or rate-limited links, you might want to go higher, say C<0.1>, |
109 | C<0.2> or even higher. |
201 | C<0.2> or even higher. |
110 | |
202 | |
111 | The default should be working ok for most links. |
203 | The default should be working OK for most links. |
112 | |
204 | |
113 | =item dns-timeout-factor = float |
205 | =item dns-timeout-factor = float |
114 | |
206 | |
115 | Factor to multiply the C<min_latency> (see C<dns-overlap-factor>) by to |
207 | Factor to multiply the C<min_latency> (see C<dns-overlap-factor>) by to |
116 | get request timeouts. The default of C<8> means that the DNS transport |
208 | get request timeouts. The default of C<8> means that the DNS transport |
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120 | |
212 | |
121 | For congested links a higher value might be necessary (e.g. C<30>). If |
213 | For congested links a higher value might be necessary (e.g. C<30>). If |
122 | the link is very stable lower values (e.g. C<2>) might work |
214 | the link is very stable lower values (e.g. C<2>) might work |
123 | nicely. Values near or below C<1> makes no sense whatsoever. |
215 | nicely. Values near or below C<1> makes no sense whatsoever. |
124 | |
216 | |
125 | The default should be working ok for most links but will result in low |
217 | The default should be working OK for most links but will result in low |
126 | throughput if packet loss is high. |
218 | throughput if packet loss is high. |
127 | |
219 | |
128 | =item if-up = relative-or-absolute-path |
220 | =item if-up = relative-or-absolute-path |
129 | |
221 | |
130 | Sets the path of a script that should be called immediately after the |
222 | Sets the path of a script that should be called immediately after the |
131 | network interface is initialized (but not neccessarily up). The following |
223 | network interface is initialized (but not necessarily up). The following |
132 | environment variables are passed to it (the values are just examples). |
224 | environment variables are passed to it (the values are just examples). |
133 | |
225 | |
134 | Variables that have the same value on all nodes: |
226 | Variables that have the same value on all nodes: |
135 | |
227 | |
136 | =over 4 |
228 | =over 4 |
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152 | select the correct syntax to use for network-related commands. |
244 | select the correct syntax to use for network-related commands. |
153 | |
245 | |
154 | =item MTU=1436 |
246 | =item MTU=1436 |
155 | |
247 | |
156 | The MTU to set the interface to. You can use lower values (if done |
248 | The MTU to set the interface to. You can use lower values (if done |
157 | consistently on all hosts), but this is usually ineffective. |
249 | consistently on all nodes), but this is usually either inefficient or |
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250 | simply ineffective. |
158 | |
251 | |
159 | =item NODES=5 |
252 | =item NODES=5 |
160 | |
253 | |
161 | The number of nodes in this GVPE network. |
254 | The number of nodes in this GVPE network. |
162 | |
255 | |
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174 | =item MAC=fe:fd:80:00:00:01 |
267 | =item MAC=fe:fd:80:00:00:01 |
175 | |
268 | |
176 | The MAC address the network interface has to use. |
269 | The MAC address the network interface has to use. |
177 | |
270 | |
178 | Might be used to initialize interfaces on platforms where GVPE does not |
271 | Might be used to initialize interfaces on platforms where GVPE does not |
179 | do this automatically. Please see the C<gvpe.osdep(5)> manpage for |
272 | do this automatically. Please see the C<gvpe.osdep(5)> man page for |
180 | platform-specific information. |
273 | platform-specific information. |
181 | |
274 | |
182 | =item NODENAME=branch1 |
275 | =item NODENAME=branch1 |
183 | |
276 | |
184 | The nickname of the node. |
277 | The nickname of the node. |
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201 | ip link set $IFNAME up |
294 | ip link set $IFNAME up |
202 | [ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME |
295 | [ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME |
203 | [ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME |
296 | [ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME |
204 | ip route add 10.0.0.0/8 dev $IFNAME |
297 | ip route add 10.0.0.0/8 dev $IFNAME |
205 | |
298 | |
206 | More complicated examples (using routing to reduce arp traffic) can be |
299 | More complicated examples (using routing to reduce ARP traffic) can be |
207 | found in the etc/ subdirectory of the distribution. |
300 | found in the F<etc/> subdirectory of the distribution. |
208 | |
301 | |
209 | =item ifname = devname |
302 | =item ifname = devname |
210 | |
303 | |
211 | Sets the tun interface name to the given name. The default is OS-specific |
304 | Sets the tun interface name to the given name. The default is OS-specific |
212 | and most probably something like C<tun0>. |
305 | and most probably something like C<tun0>. |
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221 | device. |
314 | device. |
222 | |
315 | |
223 | =item ip-proto = numerical-ip-protocol |
316 | =item ip-proto = numerical-ip-protocol |
224 | |
317 | |
225 | Sets the protocol number to be used for the rawip protocol. This is a |
318 | Sets the protocol number to be used for the rawip protocol. This is a |
226 | global option because all hosts must use the same protocol, and since |
319 | global option because all nodes must use the same protocol, and since |
227 | there are no port numbers, you cannot easily run more than one gvpe |
320 | there are no port numbers, you cannot easily run more than one gvpe |
228 | instance using the same protocol, nor can you share the protocol with |
321 | instance using the same protocol, nor can you share the protocol with |
229 | other programs. |
322 | other programs. |
230 | |
323 | |
231 | The default is 47 (GRE), which has a good chance of tunneling through |
324 | The default is 47 (GRE), which has a good chance of tunneling |
232 | firewalls (but note that the rawip protocol is not GRE compatible). Other |
325 | through firewalls (but note that gvpe's rawip protocol is not GRE |
233 | common choices are 50 (IPSEC, ESP), 51 (IPSEC, AH), 4 (IPIP tunnels) or 98 |
326 | compatible). Other common choices are 50 (IPSEC, ESP), 51 (IPSEC, AH), 4 |
234 | (ENCAP, rfc1241) |
327 | (IPIP tunnels) or 98 (ENCAP, rfc1241). |
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328 | |
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329 | Many versions of Linux seem to have a bug that causes them to reorder |
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330 | packets for some ip protocols (GRE, ESP) but not for others (AH), so |
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331 | choose wisely (that is, use 51, AH). |
235 | |
332 | |
236 | =item http-proxy-host = hostname/ip |
333 | =item http-proxy-host = hostname/ip |
237 | |
334 | |
238 | The C<http-proxy-*> family of options are only available if gvpe was |
335 | The C<http-proxy-*> family of options are only available if gvpe was |
239 | compiled with the C<--enable-http-proxy> option and enable tunneling of |
336 | compiled with the C<--enable-http-proxy> option and enable tunneling of |
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242 | C<http-proxy-host> and C<http-proxy-port> should specify the hostname and |
339 | C<http-proxy-host> and C<http-proxy-port> should specify the hostname and |
243 | port number of the proxy server. See C<http-proxy-loginpw> if your proxy |
340 | port number of the proxy server. See C<http-proxy-loginpw> if your proxy |
244 | requires authentication. |
341 | requires authentication. |
245 | |
342 | |
246 | Please note that gvpe will still try to resolve all hostnames in the |
343 | Please note that gvpe will still try to resolve all hostnames in the |
247 | configuration file, so if you are behind a proxy without access to a dns |
344 | configuration file, so if you are behind a proxy without access to a DNS |
248 | server better use numerical IP addresses. |
345 | server better use numerical IP addresses. |
249 | |
346 | |
250 | To make best use of this option disable all protocols except tcp in your |
347 | To make best use of this option disable all protocols except TCP in your |
251 | config file and make sure your routers (or all other hosts) are listening |
348 | config file and make sure your routers (or all other nodes) are listening |
252 | on a port that the proxy allows (443, https, is a common choice). |
349 | on a port that the proxy allows (443, https, is a common choice). |
253 | |
350 | |
254 | If you have a router, connecting to it will suffice. Otherwise tcp must be |
351 | If you have a router, connecting to it will suffice. Otherwise TCP must be |
255 | enabled on all hosts. |
352 | enabled on all nodes. |
256 | |
353 | |
257 | Example: |
354 | Example: |
258 | |
355 | |
259 | http-proxy-host = proxy.example.com |
356 | http-proxy-host = proxy.example.com |
260 | http-proxy-port = 3128 # 8080 is another common choice |
357 | http-proxy-port = 3128 # 8080 is another common choice |
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265 | The port where your proxy server listens. |
362 | The port where your proxy server listens. |
266 | |
363 | |
267 | =item http-proxy-auth = login:password |
364 | =item http-proxy-auth = login:password |
268 | |
365 | |
269 | The optional login and password used to authenticate to the proxy server, |
366 | The optional login and password used to authenticate to the proxy server, |
270 | seperated by a literal colon (C<:>). Only basic authentication is |
367 | separated by a literal colon (C<:>). Only basic authentication is |
271 | currently supported. |
368 | currently supported. |
272 | |
369 | |
273 | =item keepalive = seconds |
370 | =item keepalive = seconds |
274 | |
371 | |
275 | Sets the keepalive probe interval in seconds (default: C<60>). After this |
372 | Sets the keepalive probe interval in seconds (default: C<60>). After this |
276 | many seconds of inactivity the daemon will start to send keepalive probe |
373 | many seconds of inactivity the daemon will start to send keepalive probe |
277 | every 5 seconds until it receives a reply from the other end. If no reply |
374 | every 3 seconds until it receives a reply from the other end. If no reply |
278 | is received within 30 seconds, the peer is considered unreachable and the |
375 | is received within 15 seconds, the peer is considered unreachable and the |
279 | connection is closed. |
376 | connection is closed. |
280 | |
377 | |
281 | =item loglevel = noise|trace|debug|info|notice|warn|error|critical |
378 | =item loglevel = noise|trace|debug|info|notice|warn|error|critical |
282 | |
379 | |
283 | Set the logging level. Connection established messages are logged at level |
380 | Set the logging level. Connection established messages are logged at level |
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285 | |
382 | |
286 | =item mtu = bytes |
383 | =item mtu = bytes |
287 | |
384 | |
288 | Sets the maximum MTU that should be used on outgoing packets (basically |
385 | Sets the maximum MTU that should be used on outgoing packets (basically |
289 | the MTU of the outgoing interface) The daemon will automatically calculate |
386 | the MTU of the outgoing interface) The daemon will automatically calculate |
290 | maximum overhead (e.g. udp header size, encryption blocksize...) and pass |
387 | maximum overhead (e.g. UDP header size, encryption blocksize...) and pass |
291 | this information to the C<if-up> script. |
388 | this information to the C<if-up> script. |
292 | |
389 | |
293 | Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp). |
390 | Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp). |
294 | |
391 | |
295 | This value must be the minimum of the mtu values of all hosts. |
392 | This value must be the minimum of the MTU values of all nodes. |
296 | |
393 | |
297 | =item node = nickname |
394 | =item nfmark = integer |
298 | |
395 | |
299 | Not really a config setting but introduces a node section. The nickname is |
396 | This advanced option, when set to a nonzero value (default: C<0>), tries |
300 | used to select the right configuration section and must be passed as an |
397 | to set the netfilter mark (or fwmark) value on all sockets gvpe uses to |
301 | argument to the gvpe daemon. |
398 | send packets. |
|
|
399 | |
|
|
400 | This can be used to make gvpe use a different set of routing rules. For |
|
|
401 | example, on GNU/Linux, the C<if-up> could set C<nfmark> to 1000 and then |
|
|
402 | put all routing rules into table C<99> and then use an ip rule to make |
|
|
403 | gvpe traffic avoid that routing table, in effect routing normal traffic |
|
|
404 | via gvpe and gvpe traffic via the normal system routing tables: |
|
|
405 | |
|
|
406 | ip rule add not fwmark 1000 lookup 99 |
302 | |
407 | |
303 | =item node-up = relative-or-absolute-path |
408 | =item node-up = relative-or-absolute-path |
304 | |
409 | |
305 | Sets a command (default: no script) that should be called whenever a |
410 | Sets a command (default: none) that should be called whenever a connection |
306 | connection is established (even on rekeying operations). In addition to |
411 | is established (even on rekeying operations). Note that node-up/down |
|
|
412 | scripts will be run asynchronously, but execution is serialised, so there |
|
|
413 | will only ever be one such script running. |
|
|
414 | |
307 | all the variables passed to C<if-up> scripts, the following environment |
415 | In addition to all the variables passed to C<if-up> scripts, the following |
308 | variables will be set: |
416 | environment variables will be set (values are just examples): |
309 | |
417 | |
310 | =over 4 |
418 | =over 4 |
311 | |
419 | |
312 | =item DESTNODE=branch2 |
420 | =item DESTNODE=branch2 |
313 | |
421 | |
… | |
… | |
315 | |
423 | |
316 | =item DESTID=2 |
424 | =item DESTID=2 |
317 | |
425 | |
318 | The node id of the remote node. |
426 | The node id of the remote node. |
319 | |
427 | |
|
|
428 | =item DESTSI=rawip/88.99.77.55:0 |
|
|
429 | |
|
|
430 | The "socket info" of the target node, protocol dependent but usually in |
|
|
431 | the format protocol/ip:port. |
|
|
432 | |
320 | =item DESTIP=188.13.66.8 |
433 | =item DESTIP=188.13.66.8 |
321 | |
434 | |
322 | The numerical IP address of the remote host (gvpe accepts connections from |
435 | The numerical IP address of the remote node (gvpe accepts connections from |
323 | everywhere, as long as the other host can authenticate itself). |
436 | everywhere, as long as the other node can authenticate itself). |
324 | |
437 | |
325 | =item DESTPORT=655 # deprecated |
438 | =item DESTPORT=655 # deprecated |
326 | |
439 | |
327 | The UDP port used by the other side. |
440 | The protocol port used by the other side, if applicable. |
328 | |
441 | |
329 | =item STATE=UP |
442 | =item STATE=up |
330 | |
443 | |
331 | Node-up scripts get called with STATE=UP, node-down scripts get called |
444 | Node-up scripts get called with STATE=up, node-change scripts get called |
332 | with STATE=DOWN. |
445 | with STATE=change and node-down scripts get called with STATE=down. |
333 | |
446 | |
334 | =back |
447 | =back |
335 | |
448 | |
336 | Here is a nontrivial example that uses nsupdate to update the name => ip |
449 | Here is a nontrivial example that uses nsupdate to update the name => ip |
337 | mapping in some dns zone: |
450 | mapping in some DNS zone: |
338 | |
451 | |
339 | #!/bin/sh |
452 | #!/bin/sh |
340 | { |
453 | { |
341 | echo update delete $DESTNODE.lowttl.example.net. a |
454 | echo update delete $DESTNODE.lowttl.example.net. a |
342 | echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP |
455 | echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP |
343 | echo |
456 | echo |
344 | } | nsupdate -d -k $CONFBASE:key.example.net. |
457 | } | nsupdate -d -k $CONFBASE:key.example.net. |
345 | |
458 | |
|
|
459 | =item node-change = relative-or-absolute-path |
|
|
460 | |
|
|
461 | Same as C<node-change>, but gets called whenever something about a |
|
|
462 | connection changes (such as the source IP address). |
|
|
463 | |
346 | =item node-down = relative-or-absolute-path |
464 | =item node-down = relative-or-absolute-path |
347 | |
465 | |
348 | Same as C<node-up>, but gets called whenever a connection is lost. |
466 | Same as C<node-up>, but gets called whenever a connection is lost. |
349 | |
467 | |
350 | =item pid-file = path |
468 | =item pid-file = path |
351 | |
469 | |
352 | The path to the pid file to check and create |
470 | The path to the pid file to check and create |
353 | (default: C<LOCALSTATEDIR/run/gvpe.pid>). |
471 | (default: C<LOCALSTATEDIR/run/gvpe.pid>). The first C<%s> is replaced by |
|
|
472 | the nodename - any other use of C<%> must be written as C<%%>. |
354 | |
473 | |
355 | =item private-key = relative-path-to-key |
474 | =item private-key = relative-path-to-key |
356 | |
475 | |
357 | Sets the path (relative to the config directory) to the private key |
476 | Sets the path (relative to the config directory) to the private key |
358 | (default: C<hostkey>). This is a printf format string so every C<%> must |
477 | (default: C<hostkey>). This is a printf format string so every C<%> must |
359 | be doubled. A single C<%s> is replaced by the hostname, so you could |
478 | be doubled. A single C<%s> is replaced by the hostname, so you could |
360 | use paths like C<hostkeys/%s> to fetch the files at the location where |
479 | use paths like C<hostkeys/%s> to fetch the files at the location where |
361 | C<gvpectrl> puts them. |
480 | C<gvpectrl> puts them. |
362 | |
481 | |
363 | Since only the private key file of the current node is used and the |
482 | Since only the private key file of the current node is used and the |
364 | private key file should be kept secret per-host to avoid spoofings, it is |
483 | private key file should be kept secret per-node to avoid spoofing, it is |
365 | not recommended to use this feature. |
484 | not recommended to use this feature. |
366 | |
485 | |
367 | =item rekey = seconds |
486 | =item rekey = seconds |
368 | |
487 | |
369 | Sets the rekeying interval in seconds (default: C<3600>). Connections are |
488 | Sets the rekeying interval in seconds (default: C<3607>). Connections are |
370 | reestablished every C<rekey> seconds. |
489 | reestablished every C<rekey> seconds, making them use a new encryption |
|
|
490 | key. |
|
|
491 | |
|
|
492 | =item seed-device = path |
|
|
493 | |
|
|
494 | The random device used to initially and regularly seed the random |
|
|
495 | number generator (default: F</dev/urandom>). Randomness is of paramount |
|
|
496 | importance to the security of the algorithms used in gvpe. |
|
|
497 | |
|
|
498 | On program start and every seed-interval, gvpe will read 64 octets. |
|
|
499 | |
|
|
500 | Setting this path to the empty string will disable this functionality |
|
|
501 | completely (the underlying crypto library will likely look for entropy |
|
|
502 | sources on it's own though, so not all is lost). |
|
|
503 | |
|
|
504 | =item seed-interval = seconds |
|
|
505 | |
|
|
506 | The number of seconds between reseeds of the random number generator |
|
|
507 | (default: C<3613>). A value of C<0> disables this regular reseeding. |
|
|
508 | |
|
|
509 | =item serial = string |
|
|
510 | |
|
|
511 | The configuration serial number. This can be any string up to 16 bytes |
|
|
512 | length. Only when the serial matches on both sides of a conenction will |
|
|
513 | the connection succeed. This is I<not> a security mechanism and eay to |
|
|
514 | spoof, this mechanism exists to alert users that their config is outdated. |
|
|
515 | |
|
|
516 | It's recommended to specify this is a date string such as C<2013-05-05> or |
|
|
517 | C<20121205084417). |
|
|
518 | |
|
|
519 | The exact algorithm is as this: if a connection request is received form a |
|
|
520 | node with an identical serial, then it succeeds normally. |
|
|
521 | |
|
|
522 | If the remote serial is lower than the local serial, it is ignored. |
|
|
523 | |
|
|
524 | If the remote serial is higher than the local serial, a warning message is |
|
|
525 | logged. |
371 | |
526 | |
372 | =back |
527 | =back |
373 | |
528 | |
374 | =head2 NODE SPECIFIC SETTINGS |
529 | =head2 NODE SPECIFIC SETTINGS |
375 | |
530 | |
… | |
… | |
384 | |
539 | |
385 | Allow direct connections to this node. See C<deny-direct> for more info. |
540 | Allow direct connections to this node. See C<deny-direct> for more info. |
386 | |
541 | |
387 | =item compress = yes|true|on | no|false|off |
542 | =item compress = yes|true|on | no|false|off |
388 | |
543 | |
|
|
544 | For the current node, this specified whether it will accept compressed |
|
|
545 | packets, and for all other nodes, this specifies whether to try to |
389 | Wether to compress data packets sent to this host (default: C<yes>). |
546 | compress data packets sent to this node (default: C<yes>). Compression is |
390 | Compression is really cheap even on slow computers and has no size |
547 | really cheap even on slow computers, has no size overhead at all and will |
391 | overhead at all, so enabling this is a good idea. |
548 | only be used when the other side supports compression, so enabling this is |
|
|
549 | often a good idea. |
392 | |
550 | |
393 | =item connect = ondemand | never | always | disabled |
551 | =item connect = ondemand | never | always | disabled |
394 | |
552 | |
395 | Sets the connect mode (default: C<always>). It can be C<always> (always |
553 | Sets the connect mode (default: C<always>). It can be C<always> (always |
396 | try to establish and keep a connection to the given host), C<never> |
554 | try to establish and keep a connection to the given node), C<never> |
397 | (never initiate a connection to the given host, but accept connections), |
555 | (never initiate a connection to the given host, but accept connections), |
398 | C<ondemand> (try to establish a connection when there are outstanding |
556 | C<ondemand> (try to establish a connection when there are outstanding |
399 | packets in the queue and take it down after the keepalive interval) or |
557 | packets in the queue and take it down after the keepalive interval) or |
400 | C<disabled> (node is bad, don't talk to it). |
558 | C<disabled> (node is bad, don't talk to it). |
401 | |
559 | |
|
|
560 | Routers will automatically be forced to C<always> unless they are |
|
|
561 | C<disabled>, to ensure all nodes can talk to each other. |
|
|
562 | |
402 | =item deny-direct = nodename | * |
563 | =item deny-direct = nodename | * |
403 | |
564 | |
404 | Deny direct connections to the specified node (or all nodes when C<*> |
565 | Deny direct connections to the specified node (or all nodes when C<*> |
405 | is given). Only one node can be specified, but you can use multiple |
566 | is given). Only one node can be specified, but you can use multiple |
406 | C<allow-direct> and C<deny-direct> statements. This only makes sense in |
567 | C<allow-direct> and C<deny-direct> statements. This only makes sense in |
407 | networks with routers, as routers are required for indirect connections. |
568 | networks with routers, as routers are required for indirect connections. |
408 | |
569 | |
409 | Sometimes, a node cannot reach some other nodes for reasons of network |
570 | Sometimes, a node cannot reach some other nodes for reasons of network |
410 | connectivity. For example, a node behind a firewall that only allows |
571 | connectivity. For example, a node behind a firewall that only allows |
411 | conenctions to/from a single other node in the network. In this case one |
572 | connections to/from a single other node in the network. In this case one |
412 | should specify C<deny-direct = *> and C<allow-direct = othernodename> (the other |
573 | should specify C<deny-direct = *> and C<allow-direct = othernodename> (the other |
413 | node I<must> be a router for this to work). |
574 | node I<must> be a router for this to work). |
414 | |
575 | |
415 | The algorithm to check wether a connection may be direct is as follows: |
576 | The algorithm to check whether a connection may be direct is as follows: |
416 | |
577 | |
417 | 1. Other node mentioned in a C<allow-direct>? If yes, allow the connection. |
578 | 1. Other node mentioned in an C<allow-direct>? If yes, allow the connection. |
418 | |
579 | |
419 | 2. Other node mentioned in a C<deny-direct>? If yes, deny direct connections. |
580 | 2. Other node mentioned in a C<deny-direct>? If yes, deny direct connections. |
420 | |
581 | |
421 | 3. Allow the connection. |
582 | 3. Allow the connection. |
422 | |
583 | |
… | |
… | |
462 | |
623 | |
463 | =item enable-icmp = yes|true|on | no|false|off |
624 | =item enable-icmp = yes|true|on | no|false|off |
464 | |
625 | |
465 | See gvpe.protocol(7) for a description of the ICMP transport protocol. |
626 | See gvpe.protocol(7) for a description of the ICMP transport protocol. |
466 | |
627 | |
467 | Enable the ICMP transport using icmp packets of type C<icmp-type> on this |
628 | Enable the ICMP transport using ICMP packets of type C<icmp-type> on this |
468 | node. |
629 | node. |
469 | |
630 | |
470 | =item enable-rawip = yes|true|on | no|false|off |
631 | =item enable-rawip = yes|true|on | no|false|off |
471 | |
632 | |
472 | See gvpe.protocol(7) for a description of the RAW IP transport protocol. |
633 | See gvpe.protocol(7) for a description of the RAW IP transport protocol. |
… | |
… | |
484 | |
645 | |
485 | =item enable-udp = yes|true|on | no|false|off |
646 | =item enable-udp = yes|true|on | no|false|off |
486 | |
647 | |
487 | See gvpe.protocol(7) for a description of the UDP transport protocol. |
648 | See gvpe.protocol(7) for a description of the UDP transport protocol. |
488 | |
649 | |
489 | Enable the UDPv4 transport using the C<udp-port> port (default: C<no>, |
650 | Enable the UDPv4 transport using the C<udp-port> port (default: C<no>). |
490 | unless no other protocol is enabled for a node, in which case this |
|
|
491 | protocol is enabled automatically). |
|
|
492 | |
|
|
493 | NOTE: Please specify C<enable-udp = yes> if you want t use it even though |
|
|
494 | it might get switched on automatically, as some future version might |
|
|
495 | default to another default protocol. |
|
|
496 | |
651 | |
497 | =item hostname = hostname | ip [can not be defaulted] |
652 | =item hostname = hostname | ip [can not be defaulted] |
498 | |
653 | |
499 | Forces the address of this node to be set to the given dns hostname or ip |
654 | Forces the address of this node to be set to the given DNS hostname or IP |
500 | address. It will be resolved before each connect request, so dyndns should |
655 | address. It will be resolved before each connect request, so dyndns should |
501 | work fine. If this setting is not specified and a router is available, |
656 | work fine. If this setting is not specified and a router is available, |
502 | then the router will be queried for the address of this node. Otherwise, |
657 | then the router will be queried for the address of this node. Otherwise, |
503 | the connection attempt will fail. |
658 | the connection attempt will fail. |
504 | |
659 | |
|
|
660 | Note that DNS resolving is done synchronously, pausing the daemon. If that |
|
|
661 | is an issue you need to specify IP addresses. |
|
|
662 | |
505 | =item icmp-type = integer |
663 | =item icmp-type = integer |
506 | |
664 | |
507 | Sets the type value to be used for outgoing (and incoming) packets sent |
665 | Sets the type value to be used for outgoing (and incoming) packets sent |
508 | via the ICMP transport. |
666 | via the ICMP transport. |
509 | |
667 | |
510 | The default is C<0> (which is C<echo-reply>, also known as |
668 | The default is C<0> (which is C<echo-reply>, also known as |
511 | "ping-replies"). Other useful values include C<8> (C<echo-request>, a.k.a. |
669 | "ping-reply"). Other useful values include C<8> (C<echo-request>, a.k.a. |
512 | "ping") and C<11> (C<time-exceeded>), but any 8-bit value can be used. |
670 | "ping") and C<11> (C<time-exceeded>), but any 8-bit value can be used. |
513 | |
671 | |
514 | =item if-up-data = value |
672 | =item if-up-data = value |
515 | |
673 | |
516 | The value specified using this directive will be passed to the C<if-up> |
674 | The value specified using this directive will be passed to the C<if-up> |
517 | script in the environment variable C<IFUPDATA>. |
675 | script in the environment variable C<IFUPDATA>. |
518 | |
676 | |
519 | =item inherit-tos = yes|true|on | no|false|off |
677 | =item inherit-tos = yes|true|on | no|false|off |
520 | |
678 | |
521 | Wether to inherit the TOS settings of packets sent to the tunnel when |
679 | Whether to inherit the TOS settings of packets sent to the tunnel when |
522 | sending packets to this node (default: C<yes>). If set to C<yes> then |
680 | sending packets to this node (default: C<yes>). If set to C<yes> then |
523 | outgoing tunnel packets will have the same TOS setting as the packets sent |
681 | outgoing tunnel packets will have the same TOS setting as the packets sent |
524 | to the tunnel device, which is usually what you want. |
682 | to the tunnel device, which is usually what you want. |
525 | |
683 | |
526 | =item max-retry = positive-number |
684 | =item max-retry = positive-number |
527 | |
685 | |
528 | The maximum interval in seconds (default: C<3600>, one hour) between |
686 | The maximum interval in seconds (default: C<3600>, one hour) between |
529 | retries to establish a connection to this node. When a connection cannot |
687 | retries to establish a connection to this node. When a connection cannot |
530 | be established, gvpe uses exponential backoff capped at this value. It's |
688 | be established, gvpe uses exponential back-off capped at this value. It's |
531 | sometimes useful to set this to a much lower value (e.g. C<120>) on |
689 | sometimes useful to set this to a much lower value (e.g. C<120>) on |
532 | connections to routers that usually are stable but sometimes are down, to |
690 | connections to routers that usually are stable but sometimes are down, to |
533 | assure quick reconnections even after longer downtimes. |
691 | assure quick reconnections even after longer downtimes. |
534 | |
692 | |
535 | =item max-ttl = seconds |
693 | =item max-ttl = seconds |
… | |
… | |
538 | (default: C<60>). Gvpe will normally queue packets for a node without an |
696 | (default: C<60>). Gvpe will normally queue packets for a node without an |
539 | active connection, in the hope of establishing a connection soon. This |
697 | active connection, in the hope of establishing a connection soon. This |
540 | value specifies the maximum lifetime a packet will stay in the queue, if a |
698 | value specifies the maximum lifetime a packet will stay in the queue, if a |
541 | packet gets older, it will be thrown away. |
699 | packet gets older, it will be thrown away. |
542 | |
700 | |
543 | =item max-queue = positive-number |
701 | =item max-queue = positive-number>=1 |
544 | |
702 | |
545 | The maximum number of packets that will be queued (default: C<512>) |
703 | The maximum number of packets that will be queued (default: C<512>) |
546 | for this node. If more packets are sent then earlier packets will be |
704 | for this node. If more packets are sent then earlier packets will be |
547 | expired. See C<max-ttl>, above. |
705 | expired. See C<max-ttl>, above. |
548 | |
706 | |
549 | =item router-priority = 0 | 1 | positive-number>=2 |
707 | =item router-priority = 0 | 1 | positive-number>=2 |
550 | |
708 | |
551 | Sets the router priority of the given host (default: C<0>, disabled). If |
709 | Sets the router priority of the given node (default: C<0>, disabled). |
552 | some host tries to connect to another host without a hostname, it asks |
|
|
553 | the router host for it's IP address. The router host is the one with the |
|
|
554 | highest priority larger than C<1> that is currently reachable. |
|
|
555 | |
710 | |
556 | Make sure all hosts always connect (C<connect = always>) to the router |
711 | If some node tries to connect to another node but it doesn't have a |
557 | hosts, otherwise connecting to them might be impossible. |
712 | hostname, it asks a router node for it's IP address. The router node |
|
|
713 | chosen is the one with the highest priority larger than C<1> that is |
|
|
714 | currently reachable. This is called a I<mediated> connection, as the |
|
|
715 | connection itself will still be direct, but it uses another node to |
|
|
716 | mediate between the two nodes. |
|
|
717 | |
|
|
718 | The value C<0> disables routing, that means if the node receives a packet |
|
|
719 | not for itself it will not forward it but instead drop it. |
558 | |
720 | |
559 | The special value C<1> allows other hosts to route through the router |
721 | The special value C<1> allows other hosts to route through the router |
560 | host, but they will never route through it by default. The value C<0> |
722 | host, but they will never route through it by default (i.e. the config |
561 | disables routing. The idea behind this is that some hosts can, if |
723 | file of another node needs to specify a router priority higher than one |
|
|
724 | to choose such a node for routing). |
|
|
725 | |
|
|
726 | The idea behind this is that some hosts can, if required, bump the |
562 | required, bump the C<router-priority> setting to higher than C<1> in their |
727 | C<router-priority> setting to higher than C<1> in their local config to |
563 | local config to route through specific hosts. If C<router-priority> is |
728 | route through specific hosts. If C<router-priority> is C<0>, then routing |
564 | C<0>, then routing will be refused, so C<1> serves as a "enable, but do |
729 | will be refused, so C<1> serves as a "enable, but do not use by default" |
565 | not use by default" switch. |
730 | switch. |
|
|
731 | |
|
|
732 | Nodes with C<router-priority> set to C<2> or higher will always be forced |
|
|
733 | to C<connect> = C<always> (unless they are C<disabled>). |
566 | |
734 | |
567 | =item tcp-port = port-number |
735 | =item tcp-port = port-number |
568 | |
736 | |
569 | Similar to C<udp-port> (default: C<655>), but sets the TCP port number. |
737 | Similar to C<udp-port> (default: C<655>), but sets the TCP port number. |
570 | |
738 | |
… | |
… | |
579 | |
747 | |
580 | The default (or recommended) directory layout for the config directory is: |
748 | The default (or recommended) directory layout for the config directory is: |
581 | |
749 | |
582 | =over 4 |
750 | =over 4 |
583 | |
751 | |
584 | =item X<gvpe.conf> |
752 | =item gvpe.conf |
585 | |
753 | |
586 | The config file. |
754 | The config file. |
587 | |
755 | |
588 | =item X<if-up> |
756 | =item if-up |
589 | |
757 | |
590 | The if-up script |
758 | The if-up script |
591 | |
759 | |
592 | =item X<node-up>, X<node-down> |
760 | =item node-up, node-down |
593 | |
761 | |
594 | If used the node up or node-down scripts. |
762 | If used the node up or node-down scripts. |
595 | |
763 | |
596 | =item X<hostkey> |
764 | =item hostkey |
597 | |
765 | |
598 | The private key (taken from C<hostkeys/nodename>) of the current host. |
766 | The (default path of the) private key of the current host. |
599 | |
767 | |
600 | =item X<pubkey/nodename> |
768 | =item pubkey/nodename |
601 | |
769 | |
602 | The public keys of the other nodes, one file per node. |
770 | The public keys of the other nodes, one file per node. |
603 | |
771 | |
604 | =back |
772 | =back |
605 | |
773 | |