5 [<servername> <client>]
7 [<servername>] often [SERVER]
10 Keys are looked up in that order, unless otherwise specified.
11 <client> is the client's virtual address.
12 <servername> must be a valid lowercase DNS hostname and not look like
13 an address, or be COMMON, DEFAULT or SERVER.
20 Things not in a section are an error.
23 Both client and server read the files
24 /etc/hippotat/main.cfg
25 /etc/hippotat/config.d/*
26 /etc/hippotat/secrets.d/*
27 and in each case if it's a directory, all contained files whose
28 names consists of only ascii alphanumerics plus '-' and '_'.
30 The ini file format sections from these files are all unioned.
31 Later files (in the list above, or alphabetically later) can
32 override settings from earlier ones.
34 Note that although it is conventional for information for a particular
35 server or client to be in a file named after that endpoint, there is
36 no semantic link: all the files are always read and the appropriate
37 section from each is applied to every endpoint.
39 (If main.cfg does not exist, master.cfg will be tried for backward
40 compatibility reasons.)
46 Specifies <servername>.
47 Is looked up in [SERVER] and [COMMON] only.
48 If not specified there, it is SERVER.
50 Used by server to select the appropriate parts of the
51 rest of the configuration. Ignored by the client.
54 Looked up in the usual way, but used by client and server to
55 determine which possible peerings to try to set up, and which to
58 We define the sets of putative clients and servers, as follows:
59 all those, for which there is any section (even an empty one)
60 whose name is based on <client> or <servername> (as applicable).
61 (LIMIT sections do not count.)
63 The server queue packets for, and accept requests from, each
64 putative client for which the config search yields a secret.
66 Each client will create a local interface, and try to communicate
67 with the server, for each possible pair (putative server,
68 putative client) for which the config search yields a secret.
71 Command to run to create and communicate with local network
72 interface. Passed to sh -c. Must speak SLIP on stdin/stdout.
73 The following interpolations aare substituted:
74 %{local} %{peer} %{rnets} %{ifname}
75 on server <vaddr> <vrelay> <vnetwork> <ifname_server>
76 on client <client> <vaddr> <vroutes> <ifname_client>
77 Plus %{mtu} and %% to indicate a literal %.
78 (For compatibility with older hippotat, %(var)s is supported too
79 but this is deprecated since the extra `s` is confusing.)
80 ["userv root ipif %{local},%{peer},%{mtu},slip '%{rnets}'"]
82 On server: applies to all clients; not looked up in
83 client-specific sections.
84 On client: may be different for different servers.
88 Values in [<server> LIMIT] and [LIMIT] are a cap (maximum) on
89 those from the other sections (including COMMON).
92 Size limit for response payloads (used by server only)
93 [65536 bytes; LIMIT: 262144 bytes]
96 Discard packets after they have been queued this long waiting
98 On server: setting applies to downward packets, and is capped
100 On client: setting applies to upward packets, and is
101 not affected by LIMIT values.
105 On server: return with empty payload any http request oustanding
107 On client: give up on any http request outstanding for
108 for this long plus http_timeout_grace
109 Client's effective timeout must be at least server's (checked).
112 target_requests_outstanding
113 On server: whenever number of outstanding requests for
114 a client exceeds this, return oldest with empty payload
115 On client: try to keep this many requests outstanding.
116 Must match between client and server (checked).
119 Ordinary settings, used by both, not client-specific:
121 These are not looked up in the client-specific config sections.
124 Public IP (v4 or v6) address(es) of the server;
126 On server: mandatory; used for bind. No default.
127 On client: used only to construct default url.
130 Private network range (<prefix>/<length>). Must contain all
131 <client>s. Must contain <vaddr> and <vrelay>, and used
132 to compute their defaults. [172.24.230.192/28]
135 Address of server's virtual interface.
136 [first host entry in <vnetwork>, so 172.24.230.193]
139 Virtual point-to-point address used for tunnel routing
140 (does not appear in packets).
141 [first host entry in <vnetwork> other than <vaddr>,
145 Public port number of the server. [80]
146 On server: used for bind.
147 On client: used only to construct default url.
150 Of virtual interface. Must match exactly at each end.
151 (UNCHECKED) [1500 bytes]
154 Virtual interface name on the server. [shippo%d]
156 Virtual interface name on the client. [hippo%d]
157 Any %d is interpolated (by the kernel).
159 Ordinary settings, used by server only:
162 Permissible clock skew between client and server.
163 hippotat will not work if clock skew is more than this.
164 Conversely: when moving client from one public network to
165 another, the first network can deny service to the client for
166 this period after the client leaves the first network.
169 Ordinary settings, used by client only:
172 See http_timeout. [5 s]
174 max_requests_outstanding
175 Client will hold off sending more requests than this to
176 server even if it has data to send. [6]
179 Size limit for request payloads. [4000 bytes]
182 If a request fails, wait this long before considering it
183 "finished" - to limit rate of futile requests. [5 s]
186 Public url of server.
187 [http://<first-entry-in-addrs>:<port>/]
190 Virtual addresses (in CIDR syntax) to be found at the server
191 end, space-separated. Routes to those will be created on