util: Break out pollbadbit()

[secnet.git] / README

diff --git a/README b/README
index 7e40edf2024f109df94f4e9134db21927af82017..4d6f4e54e2ca54e930f75f569a84c76a077ea83c 100644 (file)
--- a/README
+++ b/README
@@ -6,11 +6,6 @@ secnet is Copyright (C) 1995--2003 Stephen Early <steve@greenend.org.uk>
 It is distributed under the terms of the GNU General Public License,
 version 2 or later.  See the file COPYING for more information.
 
 It is distributed under the terms of the GNU General Public License,
 version 2 or later.  See the file COPYING for more information.
 

-The portable snprintf implementation in snprintf.c is Copyright (C)
-1999 Mark Martinec <mark.martinec@ijs.si> and is distributed under the
-terms of the Frontier Artistic License.  You can find the standard
-version of snprintf.c at http://www.ijs.si/software/snprintf/
-

 The IP address handling library in ipaddr.py is Copyright (C)
 1996--2000 Cendio Systems AB, and is distributed under the terms of
 the GPL.
 The IP address handling library in ipaddr.py is Copyright (C)
 1996--2000 Cendio Systems AB, and is distributed under the terms of
 the GPL.


@@ -199,7 +194,7 @@ Defines:
   udp (closure => comm closure)
 
 udp: dict argument
   udp (closure => comm closure)
 
 udp: dict argument

-  address (string): IP address to listen and send on
+  address (string list): IPv6 or IPv4 addresses to listen and send on

   port (integer): UDP port to listen and send on
   buffer (buffer closure): buffer for incoming packets
   authbind (string): optional, path to authbind-helper program
   port (integer): UDP port to listen and send on
   buffer (buffer closure): buffer for incoming packets
   authbind (string): optional, path to authbind-helper program


@@ -270,27 +265,33 @@ site: dict argument
   local-name (string): this site's name for itself
   name (string): the name of the site's peer
   link (netlink closure)
   local-name (string): this site's name for itself
   name (string): the name of the site's peer
   link (netlink closure)

-  comm (comm closure)
+  comm (one or more comm closures): if there is more than one, the
+   first one will be used for any key setups initiated by us using the
+   configured address.  Others are only used if our peer talks to
+   them.

   resolver (resolver closure)
   random (randomsrc closure)
   local-key (rsaprivkey closure)
   resolver (resolver closure)
   random (randomsrc closure)
   local-key (rsaprivkey closure)

-  address (string): optional, DNS name used to find our peer
+  address (string list): optional, DNS name(s) used to find our peer;
+    address literals are supported too if enclosed in `[' `]'.

   port (integer): mandatory if 'address' is specified: the port used
     to contact our peer
   key (rsapubkey closure): our peer's public key
   transform (transform closure): how to mangle packets sent between sites
   dh (dh closure)
   hash (hash closure)
   port (integer): mandatory if 'address' is specified: the port used
     to contact our peer
   key (rsapubkey closure): our peer's public key
   transform (transform closure): how to mangle packets sent between sites
   dh (dh closure)
   hash (hash closure)

-  key-lifetime (integer): max lifetime of a session key, in ms [one hour]
+  key-lifetime (integer): max lifetime of a session key, in ms
+    [one hour; mobile: 2 days]

   setup-retries (integer): max number of times to transmit a key negotiation
   setup-retries (integer): max number of times to transmit a key negotiation

-    packet [5]
+    packet [5; mobile: 30]

   setup-timeout (integer): time between retransmissions of key negotiation
   setup-timeout (integer): time between retransmissions of key negotiation

-    packets, in ms [2000]
+    packets, in ms [2000; mobile: 1000]

   wait-time (integer): after failed key setup, wait this long (in ms) before
   wait-time (integer): after failed key setup, wait this long (in ms) before

-    allowing another attempt [20000]
+    allowing another attempt [20000; mobile: 10000]

   renegotiate-time (integer): if we see traffic on the link after this time
     then renegotiate another session key immediately (in ms)
   renegotiate-time (integer): if we see traffic on the link after this time
     then renegotiate another session key immediately (in ms)

-    [half key-lifetime, or key-lifetime minus 5 mins, whichever is longer].
+    [half key-lifetime, or key-lifetime minus 5 mins (mobile: 12 hours),
+     whichever is longer].

   keepalive (bool): if True then attempt always to keep a valid session key.
     Not actually currently implemented. [false]
   log-events (string list): types of events to log for this site
   keepalive (bool): if True then attempt always to keep a valid session key.
     Not actually currently implemented. [false]
   log-events (string list): types of events to log for this site


@@ -318,7 +319,11 @@ site: dict argument
     address may suddenly change couldn't communicate reliably because
     their contact addresses might both change at once. [false]
   mobile-peers-max (integer): Maximum number of peer port/addr pairs we
     address may suddenly change couldn't communicate reliably because
     their contact addresses might both change at once. [false]
   mobile-peers-max (integer): Maximum number of peer port/addr pairs we

-    remember and send to.  Must be at least 1 and no more than 5.  [3]
+    remember and send to.  Must be at least 1 and no more than 5.
+    [4 if any address is configured, otherwise 3]
+  static-peers-max (integer): Maximum number of peer port/addr pairs
+    we can try for a static site.  Must be at least 1 and no more
+    than 5.  [4 or 3, as above]

   mobile-peer-expiry (integer): For "mobile" peers only, the length
     of time (in seconds) for which we will keep sending to multiple
     address/ports from which we have not seen incoming traffic. [120]
   mobile-peer-expiry (integer): For "mobile" peers only, the length
     of time (in seconds) for which we will keep sending to multiple
     address/ports from which we have not seen incoming traffic. [120]


@@ -327,9 +332,34 @@ site: dict argument
     for us have "mobile True" (and if we find a site configuration for
     ourselves in the config, we insist on this).  The effect is to
     check that there are no links both ends of which are allegedly
     for us have "mobile True" (and if we find a site configuration for
     ourselves in the config, we insist on this).  The effect is to
     check that there are no links both ends of which are allegedly

-    mobile (which is not supported, so those links are ignored). [false]
+    mobile (which is not supported, so those links are ignored) and
+    to change some of the tuning parameter defaults. [false]
+  mtu-target (integer): Desired value of the inter-site MTU for this
+    peering.  This value will be advertised to the peer (which ought
+    to affect incoming packets), and if the peer advertises an MTU its
+    value will be combined with this setting to compute the inter-site
+    MTU.  (secnet will still accept packets which exceed the
+    (negotiated or assumed) inter-site MTU.)  Setting a lower
+    inter-site MTU can be used to try to restrict the sizes of the
+    packets sent over the underlying public network (e.g. to work
+    around network braindamage).  It is not normally useful to set a
+    larger value for mtu-target than the VPN's general MTU (which
+    should be reflected in the local private interface MTU, ie the mtu
+    parameter to netlink).  If this parameter is not set, or is set
+    to 0, the default is to use the local private link mtu.
+
+Links involving mobile peers have some different tuning parameter
+default values, which are generally more aggressive about retrying key
+setup but more relaxed about using old keys.  These are noted with
+"mobile:", above, and apply whether the mobile peer is local or
+remote.
+
+** transform-eax
+
+Defines:
+   eax-serpent (closure => transform closure)

 
 

-** transform
+** transform-cbcmac

 
 Defines:
   serpent256-cbc (closure => transform closure)
 
 Defines:
   serpent256-cbc (closure => transform closure)


@@ -363,7 +393,7 @@ a netlink closure:
       other tunnels as well as the host (used for mobile devices like laptops)
     soft: remove these routes from the host's routing table when
       the tunnel link quality is zero
       other tunnels as well as the host (used for mobile devices like laptops)
     soft: remove these routes from the host's routing table when
       the tunnel link quality is zero

-  mtu (integer): default MTU over this link; may be updated by tunnel code
+  mtu (integer): MTU of host's tunnel interface

 
 Netlink will dump its current routing table to the system/log on
 receipt of SIGUSR1.
 
 Netlink will dump its current routing table to the system/log on
 receipt of SIGUSR1.