mdw@git.distorted.org.uk Git - hippotat/blob - README.config

   1 -*- Fundamental -*-
   2
   3 Sections
   4
   5   [<servername> - <client>]
   6   [<client>]
   7   [<servername>]      often [SERVER]
   8   [DEFAULT]
   9
  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 DNS hostname and not look like an address.
  13
  14 Exceptional settings:
  15
  16   server
  17      Specifies <servername>.
  18      Is looked up in [SERVER] and [DEFAULT] only.
  19      If not specified there, it is SERVER.
  20
  21      Used by server to select the appropriate parts of the
  22      rest of the configuration.  Ignored by the client.
  23
  24   password
  25      Looked up in the usual way, but used by client and server to
  26      determine which possible peerings to try to set up, and which to
  27      ignore.
  28
  29      We define the sets of putative clients and servers, as follows:
  30      all those, for which there is any section (even an empty one)
  31      whose name is based on <client> or <servername> (as applicable).
  32      (LIMIT sections do not count.)
  33
  34      The server queue packets for, and accept requests from, each
  35      putative client for which the config search yields a password.
  36
  37      Each client will create a local interface, and try to communicate
  38      with the server, for each possible pair (putative server,
  39      putative client) for which the config search yields a password.
  40
  41   ipif
  42      Command to run to create and communicate with local network
  43      interface.  Passed to sh -c.  Must speak SLIP on stdin/stdout.
  44      The following additional interpolations aare substituted:
  45                        %(local)s      %(peer)s       %(rnet)s
  46           on server    <vaddr>        <vrelay>       <vnetwork>
  47           on client    <client>       <vaddr>        <vroutes>
  48      ["userv root ipif %(local)s,%(peer)s,%(mtu)s,slip %(rnets)s"]
  49
  50      On server: applies to all clients; not looked up in
  51       client-specific sections.
  52      On client: may be different for different servers.
  53
  54 Capped settings:
  55
  56      Values in [<server> LIMIT] and [LIMIT] are a cap (maximum) on
  57      those from the other sections (including DEFAULT).
  58
  59   max_batch_down
  60      Size limit for response payloads (used by server only)
  61      [65536 bytes; LIMIT: 262144 bytes]
  62
  63   max_queue_time
  64      Discard packets after they have been queued this long waiting
  65      for http.
  66      On server: setting applies to downward packets, and is capped
  67       by LIMIT values.
  68      On client: setting applies to upward packets, and is
  69       not affected by LIMIT values.
  70      [10 s; LIMIT: 121 s]
  71
  72   http_timeout
  73      On server: return with empty payload any http request oustanding
  74       for this long
  75      On client: give up on any http request outstanding for
  76       for this long plus http_timeout_grace
  77      Client's effective timeout must be at least server's (checked).
  78      [30 s; LIMIT: 121]
  79
  80   target_requests_outstanding
  81      On server: whenever number of outstanding requests for
  82       a client exceeds this, return oldest with empty payload
  83      On client: try to keep this many requests outstanding.
  84      Must match between client and server (checked).
  85      [3; LIMIT: 10]
  86
  87 Ordinary settings, used by both, not client-specific:
  88
  89     These are not looked up in the client-specific config sections.
  90
  91   addrs
  92      Public IP (v4 or v6) address(es) of the server;
  93      space-separated.
  94      On server: mandatory; used for bind.  No default.
  95      On client: used only to construct default url.
  96
  97   vnetwork
  98      Private network range (<prefix>/<length>).  Must contain all
  99      <client>s.  Must contain <vaddr> and <vrelay>, and used
 100      to compute their defaults.  [172.24.230.192/28]
 101
 102   vaddr
 103      Address of server's virtual interface.
 104
 105   vrelay
 106      Virtual point-to-point address used for tunnel routing
 107      (does not appear in packets).
 108      [first host entry in <vnetwork> other than <vaddr>,
 109       so 172.24.230.194]
 110
 111   port
 112      Public port number of the server.  [80]
 113      On server: used for bind.
 114      On client: used only to construct default url.
 115
 116   mtu
 117      Must match exactly.  (UNCHECKED) [1500 bytes]
 118
 119 Ordinary settings, used by client only:
 120
 121   http_timeout_grace
 122      See http_timeout.  [5 s]
 123
 124   max_requests_outstanding
 125      Client will hold off sending more requests than this to
 126      server even if it has data to send.  [6]
 127
 128   max_batch_up
 129      Size limit for request payloads. [4000 bytes]
 130
 131   http_retry
 132      If a request fails, wait this long before considering it
 133      "finished" - to limit rate of futile requests.  [5 s]
 134
 135   url
 136      Public url of server.
 137      [http://<first-entry-in-addrs>:<port>/]
 138
 139   vroutes
 140      Virtual addresses (in CIDR syntax) to be found at the server
 141      end, space-separated.  Routes to those will be created on
 142      the client.  [""]