[ViewVC] Annotation of: cvs/gvpe/NEWS

GVPE NEWS

TODO: updqate donna?
TODO: clear one-time key/auth material from memory?
        - update embedded liblzf.
        - use liblzf with static hash table: lowers stack usage.
        - do not initialise liblzf hash table for faster operation.
        - use C++ variadic templates for callback.h, get rid of callback.pl.

3.1  Sat Oct 27 07:50:43 CEST 2018
        - port to openssl 1.1 BUT SEE WARNING IN configure.ac. Do not use!
        - tinc cruft removal: remove getopt.[ch], it's less portable to
          have it then to not have it.
        - tinc cruft removal: use pkg-config to detect libressl/openssl.
        - minor cleanups.

3.0  Thu Nov 10 15:39:58 CET 2016
        - INCOMPATIBLE CHANGE: core protocol version 1.0.
        - INCOMPATIBLE CHANGE: node sections are now introduced
          with "node nodename", not "node = nodename".
        - INCOMPATIBLE CHANGE: gvpectrl -g will now generate a single
          keypair, while -G will try to generate all keypairs as before.
        - openssl 1.0.2 is the latest supported openssl release,
          openssl 1.1.0 is not supported at the moment as the work to
          make it compatible to both versions is just too much. a switch
          to openssl 1.1 or another library will be done in a future release.
        - update examples to not generate keys centrally, but locally on each
          node.
        - add workaround for temporary/rare ENOBUFS condition.
        - while individual packets couldn't be replayed, a whole session
          could be replayed - this has been fixed by an extra key exchange.
        - fix a delete vs. delete [] mismatch in the central logging function.
        - in addition to rsa key exchange and authentication, the handshake now
          adds a diffie-hellman key exchange (using curve25119) for perfect
          forward secrecy. mac and cipher keys are derived using HKDF.
        - rsa key sizes are now configurable and larger (default is 3072).
          correspondingly, the minimum mtu is no longer 296 but 576.
        - fixed a potential (unverified) buffer overrun on rsa decryption.
        - new per-node low-power setting that tries to reduce cpu/network usage.
        - router reconnects could cause excessive rekeying on other connections.
        - gvpectrl no longer generates all missing public keys, but
          only missing private keys. private keys are also put
          into the configured location.
        - the pid-file now accepts %s as nodename as elsewhere.
        - switch to counter mode (only aes supported at the moment in
          openssl). this gets rid of the need to generate a random iv,
          is likely more secure (and, as a side effect, gets rid of
          slow randomness generation. counter mode is often faster
          then cbc mode as well, and packets are smaller).
        - no longer use RAND_bytes to generate session keys - you NEED
          a real source of entropy now (e.g. egd or /dev/random - see the
          openssl documentation).
        - multiple node statements for the same node are now supported
          and will be merged.
        - a new directive "global" switches back to the global section
          of the config file.
        - if-up scripts can now be specified with absolute paths.
        - new global option: serial, to detect configuration mismatches.
        - use HKDF as authentication proof, not HMAC or a plain hash
          (hint by Ilmari Karonen).
        - during rekeying or connection establishments, hmac authentication
          errors could occur and reset the connection. Transient hmac
          authentication errors are now being ignored for 3 seconds.
        - log the reason for a conneciton loss.
        - use a (hopefully) constant time memcmp to compare internal secrets.
        - fix a (harmless) errornous out of bounds stack read that would trigger
          gcc's -fsanitize=address.
        - bump old packet window size from 512 to 65536.
        - update for big changes in openssl 1.1 API, wrap primitives
          to make further changes easier.
        - correctly check return values for openssl 1.0.0 and later.
        - check for both public and private key file when deciding whether
          to skip generating a key to avoid accidental overwrites.
          
2.25 Sat Jul 13 06:42:33 CEST 2013
        - INCOMPATIBLE CHANGE: no longer enable udp protocol if no other
          protocols are enabled - this is necessary when you have nodes with
          completely unknown protocols, to force mediated connection requests.
        - INCOMPATIBLE CHANGE: dns transport protocol bumped to version 2.
        - core protocol version 0.1, compatible with older releases.
        - switch to using RSA_generate_key_ex, which is the badly documented
          and needlessly more complicated replacement for the RSA_generate_key
          function which is now deprecated.
        - support additional hmac hashes: sha256 and sha512, usually truncated.
        - change public exponent for rsa keys from 65535 to 65537, for
          efficiency reasons - only affects new keys.
        - nodes would sometimes declare transport endpoints valid despite
          the protocol not being configured locally.
        - new global configuration options: chroot, chuser, chuid, chgid,
          to chroot to a specified or anonymous new root, and change user id.
        - new global configuration options seed_device and seed_interval,
          to configure another device than /dev/urandom for random seeds,
          and to configure a regular interval to reseed the rng.
        - prefer inet_aton over gethostbyname, as the latter is not guaranteed
          to "resolve" literal ip addresses.
        - configure didn't detect openssl 1.0 because SHA1_version became private
          (patch by TANIGUCHI Takaki).
        - fix a bug where nodes would tell the other side that it supports
          the same protocols as that other side, instead of its own.
        - add zlib when found, as openssl depends on it in newer versions.
        - work around append-bugs in uclibc by using an extra seek.
        - new "include" directive for the config file.
        - gvpectrl no longer evaluates any "on" directives.
        - icmp and rawip protocols weren't upgradable to each other.
        - major, but incremental, dns transport improvements:
           - do not simply abort in some error cases in the dns transport,
             but try to recover.
           - allow lowercase/uppercase aliases for base-n encodings that do
             not rely on case.
           - use base26 instead of base22 encoding for dns syn's, and
             base36 instead of base22 for headers (saves one byte/packet).
           - back off far quicker in dns tunnel when idling - increases
             latency on an idle link somewhat, but avoids hundreds of
             needless packets.
           - poll more aggressively when idling in dns (poll once per
             second as opposed to once per 5 seconds).
           - reduce dns send payload size to allow greater rate of ack
             messages (should help sack and ipv6).
        - allow for ip options in rawip/icmp transports, even though gvpe
          doesn't generate them.
        - upgrade to autoconf 2.69, automake 1.11.
        - upgrade to libev 4 API.
        - replace COPYING file by actual GPLv3 - files were relicensed to GPLv3
          earlier but COPYING was forgotten.

2.24 Sat Feb 12 05:15:48 CET 2011
        - protocol version 0.1, compatible with older releases.
        - due to a bug, when packets were lost, a connection could go into a
          state where a ping/connection request from another node would be
          ignored, leading to connections not being re-established.
        - due to a bug, compression was almost always enabled.
        - enable-max-mtu was actually enable-mtu, contrary to documentation.
        - add nfmark support.
        - add node-change script support.
        - new DESTSI variable for node-xxx scripts.
        - updated codingstyle a bit, declared truly static stuff as static.
        - clarify compression docs.

2.22 Sun Feb  1 17:25:28 CET 2009
        - protocol version 0.1, compatible with older releases.
        - enabled icmp/tcp/http-proxy protocols by default.
        - updated copyright in program greetings.
        - fix some configure messages.
        - updated to libev 3.52.

2.21 Wed Sep  3 06:56:27 CEST 2008
        - protocol version 0.1, compatible with older releases.
        - add missing ev++.h include header to tarball, which everybody
          who tested it apparently had in their include path :(. Caught
          by Karl Kleinpaste and Marcus Kong.

2.2  Mon Sep  1 06:28:09 CEST 2008
        - protocol version 0.1, compatible with older releases.
          but upgrade is recommended to due changed ondemand behaviour.
        - new per-node options max-ttl and max-queue.
        - convert from iom.C to libev, a high-performance event loop
          (http://software.schmorp.de/pkg/libev).
        - tcp connections were leaking in some cases.
        - retry more aggressively (once/s) to establish a connection if
          new packets arrive for it.
        - save a lot of setsockopt calls when the tos doesn't change.
        - honor disabled even on initial connect attempt.
        - changed callback mechanism to be slightly less portable
          but more efficient mechanism (standards-compliant c++ compilers
          should work).
        - increased receive window positive size, to allow for massive
          packet loss due to occasional longer drop-outs.
        - send RST when a positive window size violation is detected, but
          not in other cases, to reconnect more quickly.
        - upgraded liblzf to version 3.4.
        - dropped -fno-exceptions due to ev++.h using it.
        - node-up/down scripts are now run in sequence.
        - new -q switch for gvpectrl, for when you run it often.
        - work around the horribly inconsistent, ad-hoc, ever-changing
          and broken texinfo syntax. YMMV. avoid texinfo.
        - keepalive is more aggressive now, sensding ping's every 3 seconds
          and killing the conenction after 15 seconds.
        - bugfixes.

2.01 Thu Mar 29 19:26:04 CEST 2007
        - protocol version 0.1, compatible with older releases.
        - bugfix of callback.h, might have cause callback return values to
          be corrupted on architectures like sparc before.
        - dns transport retries more aggressively.
        - updated documentation, improved dns transport reliability
          and throughput.
        - added experimental support for sha256 and sha512 digests.

2.0 Mon Dec  5 13:59:26 CET 2005
        - protocol version 0.1, compatible with older releases.
        - implement allow-direct, deny-direct node config statements.
        - implemented != for sockinfo. This fixes a bug where
          gvpe sent packets to the old ip address of another host
          even though it had received packets from it's new address.
          This only causes problems if you forget to -HUP your gvpe after
          your ip address changed, which is *required*.
        - sets close-on-exec flag on tcp connections. This fixes a bug
          where child processes kept tcp connections open and caused
          connections to fail when only one side can connect.
        - fixed a bug in receive sequence checking that made gvpe
          accept out-of-window packets in most cases.
        - tighter limit for the maximum sequence # to avoid overflow
          conditions + allow more headroom for packet reordering.
        - replace some asserts that trapped config mismatches by
          more useful log messages.
        - fix spurious extra newline in some log messages.

1.9 Tue Apr 19 06:21:50 CEST 2005
        - protocol version 0.1, compatible with older releases.
        - WARNING: this version checks the return value of if-up etc.
          scripts and exits on failure.
        - IMPORTANT: run if-up/node-up etc. scripts via /bin/sh.
        - IMPORTANT: interface initialization (MAC, MTU) is now done
          automatically in most configurations.
        - options can now be specified on the gvpe command line, too.
        - make some DNS transport values configurable and document them.
        - improved OS specific information in gvpe.osdep(5).
        - new tap device type "native/darwin", that supports the tap
          driver available for darwin (thanks to matthew mead who tested
          it out with me in a long session). tincd/darwin is still available.
        - new device type "tincd/bsd", which is a newer version of the
          *bsd-drivers taken from tinc.
        - fixed a bug in relying on the order of global construction
          when tcp transport was enabled. The fix makes it use no
          cpu time unless it is in use, too.
        - information about other nodes is now available to if-up etc. scripts.
        - the value of the config variable if-up-data is passed to the if-up
          etc. scripts.
        - skip unparsable config lines with a warning instead of stopping
          parsing and continuing with a certainly unusable config.

1.8 Fri Mar 18 00:58:55 CET 2005
        - protocol version 0.1, compatible with older releases.
        - enable-udp = yes is now default only when no other protocols
          are enabled. otherwise it is disabled unless explicitly enabled.
        - implemented dns tunneling (experimental now and in the future).
        - remove support for pre-release version protocol.
        - updated tincd drivers (rev 1433), added uml_socket driver, documented
          tincd drivers a bit better.
        - document icmp configuration values.
        - document transport protocols in gvpe.protocol(7).
        - remove unused ChangeLog file.
        - created a mailinglist at gvpe@lists.schmorp.de.
        - added an exemption to allow distribution of binaries linked against
          OpenSSL, as suggested by Guus Sliepen (author of tinc). No
          GNUTLS conversion in sight.
        - some portability fixes with respect to --disable-nls.

1.7 Tue Feb 22 23:58:59 CET 2005
        - protocol version 0.1, compatible with older releases.
        - first gnu release.
        - documented the special value 1 for router-priority.
        - renamed vped => gvpe and vpectrl => gvpectrl, as well as
          vped.conf => gvpe.conf.
        - new per-node option "max-retry".
        - asymmetric rekeying behaviour, so hosts don't rekey simultaneously.
        - new configure option --enable-static-daemon.
        - fix configure --help output.
        - many documentation layout fixes.
        - synced iom.[Ch] from rxvt-unicode.
        - try to cope with some non-monotonic time changes.
        - revert to locale.h - a usual, clocale is nonfunctioning on macosx.
        - considerably improved pod2texi and the resulting texi doc.

1.6.1 Wed May 12 14:48:20 CEST 2004
        - protocol version 0.1, compatible with older releases.
        - fix -c switch that has been broken due to a last-minute fix
          to option and config file parsing.

1.6 Mon May 10 20:55:10 CEST 2004
        - protocol version 0.1, compatible with older releases.
        - do not RESET on out-of-sequence packets (good for wireless).
        - various non-security-related bugfixes.
        - c++ify (at least make it compile with g++-3.4, which should make
          it a little bit more standard c++).

1.5 Fri Jan 30 00:50:04 CET 2004
        - protocol version 0.1, compatible with older releases.
        - vped will refuse to start when hostkey and public key do not match.
        - updated lzf code to version 1.2.
        - better error reporting for "unusual" conditions, like failing
          to allocate memory, that should not normally happen and
          will otherwise result in spurious other error messages. Also
          adds paranoid checks in case openssl's API changes in a bad way.
        - fix a bug where queued vpn packets were cleared to zero. while
          this doesn't affect security, it did cause warning messages and
          unnecessary connectivity delays.

1.4 Sat Jan 17 15:49:21 CET 2004
        - protocol version 0.1, compatible with older releases.
        - better retry behaviour on key mismatch.
        - use select-based io_manager instead of poll-based one.
        - share io manager between rxvt-unicode and vpe.
        - sooo many *BSD workarounds because no BSD I could find is even
          remotely POSIX-compatible.

1.2 Fri Oct 17 03:44:44 CEST 2003
        - protocol version 0.1.
        - tincd kernel interface code imported, more supported platforms
          (native/linux (2.4), tincd/linux (2.2 and 2.4), tincd/freebsd,
          native/cygwin).
        - added primitive ethernet emulation (ipv4 only), which allows
          the following platforms that only have tun drivers to work:
          /* none yet tested */
        - portability workarounds, especially for unfriendly freebsd
        - very minor bugfixes
        - warnings when choosing insecure ciphers/hashes
        - reduced default hmac length to 8.
        - cvs now contains configure, Makefile.in and other generated files.
        - added doc/complex-example to the distribution.

1.0 distant past
        - protocol version 0.1.
        - tweaked various timeouts to help very slow (486) class
          machines or nets with many hosts.
        - tweaked rate-limiting to be more forgiving for hosts
          connecting through routers (not a fix).

Revision:	1.140
Committed:	Mon Jan 13 11:30:35 2020 UTC (4 years, 3 months ago) by root
Branch:	MAIN
Changes since 1.139:	+2 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.83	GVPE NEWS
2	pcg	1.57
3	root	1.140	TODO: updqate donna?
4			TODO: clear one-time key/auth material from memory?
5	root	1.139	- update embedded liblzf.
6			- use liblzf with static hash table: lowers stack usage.
7			- do not initialise liblzf hash table for faster operation.
8			- use C++ variadic templates for callback.h, get rid of callback.pl.
9	root	1.138
10	root	1.137	3.1 Sat Oct 27 07:50:43 CEST 2018
11	root	1.136	- port to openssl 1.1 BUT SEE WARNING IN configure.ac. Do not use!
12	root	1.138	- tinc cruft removal: remove getopt.[ch], it's less portable to
13	root	1.134	have it then to not have it.
14	root	1.136	- tinc cruft removal: use pkg-config to detect libressl/openssl.
15	root	1.135	- minor cleanups.
16	root	1.134
17	root	1.133	3.0 Thu Nov 10 15:39:58 CET 2016
18	root	1.114	- INCOMPATIBLE CHANGE: core protocol version 1.0.
19	root	1.123	- INCOMPATIBLE CHANGE: node sections are now introduced
20	root	1.116	with "node nodename", not "node = nodename".
21	root	1.132	- INCOMPATIBLE CHANGE: gvpectrl -g will now generate a single
22			keypair, while -G will try to generate all keypairs as before.
23	root	1.131	- openssl 1.0.2 is the latest supported openssl release,
24			openssl 1.1.0 is not supported at the moment as the work to
25			make it compatible to both versions is just too much. a switch
26			to openssl 1.1 or another library will be done in a future release.
27	root	1.132	- update examples to not generate keys centrally, but locally on each
28			node.
29	root	1.128	- add workaround for temporary/rare ENOBUFS condition.
30	root	1.114	- while individual packets couldn't be replayed, a whole session
31			could be replayed - this has been fixed by an extra key exchange.
32	root	1.126	- fix a delete vs. delete [] mismatch in the central logging function.
33	root	1.114	- in addition to rsa key exchange and authentication, the handshake now
34			adds a diffie-hellman key exchange (using curve25119) for perfect
35			forward secrecy. mac and cipher keys are derived using HKDF.
36			- rsa key sizes are now configurable and larger (default is 3072).
37			correspondingly, the minimum mtu is no longer 296 but 576.
38			- fixed a potential (unverified) buffer overrun on rsa decryption.
39	root	1.120	- new per-node low-power setting that tries to reduce cpu/network usage.
40	root	1.119	- router reconnects could cause excessive rekeying on other connections.
41	root	1.114	- gvpectrl no longer generates all missing public keys, but
42			only missing private keys. private keys are also put
43			into the configured location.
44			- the pid-file now accepts %s as nodename as elsewhere.
45	root	1.124	- switch to counter mode (only aes supported at the moment in
46			openssl). this gets rid of the need to generate a random iv,
47			is likely more secure (and, as a side effect, gets rid of
48			slow randomness generation. counter mode is often faster
49	root	1.125	then cbc mode as well, and packets are smaller).
50	root	1.115	- no longer use RAND_bytes to generate session keys - you NEED
51			a real source of entropy now (e.g. egd or /dev/random - see the
52			openssl documentation).
53	root	1.116	- multiple node statements for the same node are now supported
54			and will be merged.
55			- a new directive "global" switches back to the global section
56			of the config file.
57			- if-up scripts can now be specified with absolute paths.
58	root	1.117	- new global option: serial, to detect configuration mismatches.
59	root	1.118	- use HKDF as authentication proof, not HMAC or a plain hash
60			(hint by Ilmari Karonen).
61	root	1.132	- during rekeying or connection establishments, hmac authentication
62	root	1.119	errors could occur and reset the connection. Transient hmac
63			authentication errors are now being ignored for 3 seconds.
64			- log the reason for a conneciton loss.
65	root	1.121	- use a (hopefully) constant time memcmp to compare internal secrets.
66	root	1.127	- fix a (harmless) errornous out of bounds stack read that would trigger
67			gcc's -fsanitize=address.
68	root	1.129	- bump old packet window size from 512 to 65536.
69	root	1.130	- update for big changes in openssl 1.1 API, wrap primitives
70			to make further changes easier.
71			- correctly check return values for openssl 1.0.0 and later.
72	root	1.131	- check for both public and private key file when deciding whether
73			to skip generating a key to avoid accidental overwrites.
74	root	1.116
75	root	1.114	2.25 Sat Jul 13 06:42:33 CEST 2013
76	root	1.97	- INCOMPATIBLE CHANGE: no longer enable udp protocol if no other
77			protocols are enabled - this is necessary when you have nodes with
78			completely unknown protocols, to force mediated connection requests.
79	root	1.99	- INCOMPATIBLE CHANGE: dns transport protocol bumped to version 2.
80	root	1.112	- core protocol version 0.1, compatible with older releases.
81	root	1.110	- switch to using RSA_generate_key_ex, which is the badly documented
82	root	1.108	and needlessly more complicated replacement for the RSA_generate_key
83			function which is now deprecated.
84	root	1.112	- support additional hmac hashes: sha256 and sha512, usually truncated.
85	root	1.108	- change public exponent for rsa keys from 65535 to 65537, for
86	root	1.110	efficiency reasons - only affects new keys.
87	root	1.105	- nodes would sometimes declare transport endpoints valid despite
88			the protocol not being configured locally.
89	root	1.106	- new global configuration options: chroot, chuser, chuid, chgid,
90			to chroot to a specified or anonymous new root, and change user id.
91	root	1.112	- new global configuration options seed_device and seed_interval,
92			to configure another device than /dev/urandom for random seeds,
93	root	1.116	and to configure a regular interval to reseed the rng.
94	root	1.107	- prefer inet_aton over gethostbyname, as the latter is not guaranteed
95			to "resolve" literal ip addresses.
96	root	1.102	- configure didn't detect openssl 1.0 because SHA1_version became private
97			(patch by TANIGUCHI Takaki).
98	root	1.97	- fix a bug where nodes would tell the other side that it supports
99			the same protocols as that other side, instead of its own.
100	root	1.98	- add zlib when found, as openssl depends on it in newer versions.
101			- work around append-bugs in uclibc by using an extra seek.
102	root	1.99	- new "include" directive for the config file.
103	root	1.100	- gvpectrl no longer evaluates any "on" directives.
104	root	1.102	- icmp and rawip protocols weren't upgradable to each other.
105	root	1.99	- major, but incremental, dns transport improvements:
106			- do not simply abort in some error cases in the dns transport,
107			but try to recover.
108	root	1.116	- allow lowercase/uppercase aliases for base-n encodings that do
109	root	1.99	not rely on case.
110			- use base26 instead of base22 encoding for dns syn's, and
111			base36 instead of base22 for headers (saves one byte/packet).
112			- back off far quicker in dns tunnel when idling - increases
113			latency on an idle link somewhat, but avoids hundreds of
114			needless packets.
115			- poll more aggressively when idling in dns (poll once per
116			second as opposed to once per 5 seconds).
117	root	1.104	- reduce dns send payload size to allow greater rate of ack
118			messages (should help sack and ipv6).
119	root	1.103	- allow for ip options in rawip/icmp transports, even though gvpe
120			doesn't generate them.
121	root	1.113	- upgrade to autoconf 2.69, automake 1.11.
122	root	1.101	- upgrade to libev 4 API.
123	root	1.113	- replace COPYING file by actual GPLv3 - files were relicensed to GPLv3
124			earlier but COPYING was forgotten.
125	root	1.97
126			2.24 Sat Feb 12 05:15:48 CET 2011
127			- protocol version 0.1, compatible with older releases.
128	root	1.95	- due to a bug, when packets were lost, a connection could go into a
129	root	1.94	state where a ping/connection request from another node would be
130	root	1.96	ignored, leading to connections not being re-established.
131	pcg	1.93	- due to a bug, compression was almost always enabled.
132	pcg	1.92	- enable-max-mtu was actually enable-mtu, contrary to documentation.
133	pcg	1.90	- add nfmark support.
134	pcg	1.91	- add node-change script support.
135			- new DESTSI variable for node-xxx scripts.
136	root	1.95	- updated codingstyle a bit, declared truly static stuff as static.
137	root	1.96	- clarify compression docs.
138	pcg	1.90
139	pcg	1.89	2.22 Sun Feb 1 17:25:28 CET 2009
140	root	1.97	- protocol version 0.1, compatible with older releases.
141	pcg	1.86	- enabled icmp/tcp/http-proxy protocols by default.
142	pcg	1.85	- updated copyright in program greetings.
143	pcg	1.86	- fix some configure messages.
144	pcg	1.87	- updated to libev 3.52.
145	pcg	1.85
146	pcg	1.84	2.21 Wed Sep 3 06:56:27 CEST 2008
147	root	1.97	- protocol version 0.1, compatible with older releases.
148	pcg	1.84	- add missing ev++.h include header to tarball, which everybody
149			who tested it apparently had in their include path :(. Caught
150	pcg	1.85	by Karl Kleinpaste and Marcus Kong.
151	pcg	1.84
152	pcg	1.83	2.2 Mon Sep 1 06:28:09 CEST 2008
153	root	1.97	- protocol version 0.1, compatible with older releases.
154	pcg	1.78	but upgrade is recommended to due changed ondemand behaviour.
155			- new per-node options max-ttl and max-queue.
156	pcg	1.72	- convert from iom.C to libev, a high-performance event loop
157	pcg	1.71	(http://software.schmorp.de/pkg/libev).
158	pcg	1.73	- tcp connections were leaking in some cases.
159	pcg	1.78	- retry more aggressively (once/s) to establish a connection if
160			new packets arrive for it.
161	pcg	1.75	- save a lot of setsockopt calls when the tos doesn't change.
162	pcg	1.78	- honor disabled even on initial connect attempt.
163	pcg	1.76	- changed callback mechanism to be slightly less portable
164			but more efficient mechanism (standards-compliant c++ compilers
165			should work).
166	pcg	1.80	- increased receive window positive size, to allow for massive
167			packet loss due to occasional longer drop-outs.
168			- send RST when a positive window size violation is detected, but
169			not in other cases, to reconnect more quickly.
170	pcg	1.83	- upgraded liblzf to version 3.4.
171	pcg	1.77	- dropped -fno-exceptions due to ev++.h using it.
172	pcg	1.81	- node-up/down scripts are now run in sequence.
173			- new -q switch for gvpectrl, for when you run it often.
174	pcg	1.82	- work around the horribly inconsistent, ad-hoc, ever-changing
175			and broken texinfo syntax. YMMV. avoid texinfo.
176	pcg	1.83	- keepalive is more aggressive now, sensding ping's every 3 seconds
177			and killing the conenction after 15 seconds.
178	pcg	1.71	- bugfixes.
179
180	pcg	1.70	2.01 Thu Mar 29 19:26:04 CEST 2007
181	pcg	1.69	- protocol version 0.1, compatible with older releases.
182	pcg	1.68	- bugfix of callback.h, might have cause callback return values to
183			be corrupted on architectures like sparc before.
184	pcg	1.69	- dns transport retries more aggressively.
185	pcg	1.70	- updated documentation, improved dns transport reliability
186			and throughput.
187			- added experimental support for sha256 and sha512 digests.
188	pcg	1.67
189	pcg	1.66	2.0 Mon Dec 5 13:59:26 CET 2005
190	pcg	1.56	- protocol version 0.1, compatible with older releases.
191	pcg	1.65	- implement allow-direct, deny-direct node config statements.
192	pcg	1.59	- implemented != for sockinfo. This fixes a bug where
193			gvpe sent packets to the old ip address of another host
194			even though it had received packets from it's new address.
195	pcg	1.61	This only causes problems if you forget to -HUP your gvpe after
196	pcg	1.59	your ip address changed, which is required.
197	pcg	1.64	- sets close-on-exec flag on tcp connections. This fixes a bug
198			where child processes kept tcp connections open and caused
199			connections to fail when only one side can connect.
200			- fixed a bug in receive sequence checking that made gvpe
201			accept out-of-window packets in most cases.
202	pcg	1.61	- tighter limit for the maximum sequence # to avoid overflow
203			conditions + allow more headroom for packet reordering.
204	pcg	1.66	- replace some asserts that trapped config mismatches by
205	pcg	1.62	more useful log messages.
206	pcg	1.63	- fix spurious extra newline in some log messages.
207	pcg	1.56
208	pcg	1.55	1.9 Tue Apr 19 06:21:50 CEST 2005
209	pcg	1.56	- protocol version 0.1, compatible with older releases.
210	pcg	1.49	- WARNING: this version checks the return value of if-up etc.
211			scripts and exits on failure.
212	pcg	1.50	- IMPORTANT: run if-up/node-up etc. scripts via /bin/sh.
213			- IMPORTANT: interface initialization (MAC, MTU) is now done
214			automatically in most configurations.
215	pcg	1.54	- options can now be specified on the gvpe command line, too.
216	pcg	1.49	- make some DNS transport values configurable and document them.
217			- improved OS specific information in gvpe.osdep(5).
218	pcg	1.51	- new tap device type "native/darwin", that supports the tap
219	pcg	1.45	driver available for darwin (thanks to matthew mead who tested
220	pcg	1.47	it out with me in a long session). tincd/darwin is still available.
221	pcg	1.51	- new device type "tincd/bsd", which is a newer version of the
222			*bsd-drivers taken from tinc.
223	pcg	1.46	- fixed a bug in relying on the order of global construction
224			when tcp transport was enabled. The fix makes it use no
225			cpu time unless it is in use, too.
226	pcg	1.52	- information about other nodes is now available to if-up etc. scripts.
227			- the value of the config variable if-up-data is passed to the if-up
228			etc. scripts.
229	pcg	1.49	- skip unparsable config lines with a warning instead of stopping
230			parsing and continuing with a certainly unusable config.
231	pcg	1.43
232	pcg	1.41	1.8 Fri Mar 18 00:58:55 CET 2005
233	pcg	1.56	- protocol version 0.1, compatible with older releases.
234	pcg	1.36	- enable-udp = yes is now default only when no other protocols
235			are enabled. otherwise it is disabled unless explicitly enabled.
236	pcg	1.40	- implemented dns tunneling (experimental now and in the future).
237	pcg	1.39	- remove support for pre-release version protocol.
238	pcg	1.41	- updated tincd drivers (rev 1433), added uml_socket driver, documented
239			tincd drivers a bit better.
240	pcg	1.40	- document icmp configuration values.
241			- document transport protocols in gvpe.protocol(7).
242			- remove unused ChangeLog file.
243	pcg	1.41	- created a mailinglist at gvpe@lists.schmorp.de.
244			- added an exemption to allow distribution of binaries linked against
245			OpenSSL, as suggested by Guus Sliepen (author of tinc). No
246			GNUTLS conversion in sight.
247	pcg	1.42	- some portability fixes with respect to --disable-nls.
248	pcg	1.36
249	pcg	1.35	1.7 Tue Feb 22 23:58:59 CET 2005
250	pcg	1.32	- protocol version 0.1, compatible with older releases.
251	pcg	1.26	- first gnu release.
252	pcg	1.27	- documented the special value 1 for router-priority.
253	pcg	1.26	- renamed vped => gvpe and vpectrl => gvpectrl, as well as
254			vped.conf => gvpe.conf.
255	pcg	1.29	- new per-node option "max-retry".
256	pcg	1.22	- asymmetric rekeying behaviour, so hosts don't rekey simultaneously.
257	pcg	1.24	- new configure option --enable-static-daemon.
258	pcg	1.23	- fix configure --help output.
259	pcg	1.26	- many documentation layout fixes.
260	pcg	1.28	- synced iom.[Ch] from rxvt-unicode.
261	pcg	1.34	- try to cope with some non-monotonic time changes.
262	pcg	1.30	- revert to locale.h - a usual, clocale is nonfunctioning on macosx.
263	pcg	1.32	- considerably improved pod2texi and the resulting texi doc.
264	pcg	1.22
265	pcg	1.21	1.6.1 Wed May 12 14:48:20 CEST 2004
266	pcg	1.32	- protocol version 0.1, compatible with older releases.
267	pcg	1.22	- fix -c switch that has been broken due to a last-minute fix
268			to option and config file parsing.
269	pcg	1.21
270	pcg	1.20	1.6 Mon May 10 20:55:10 CEST 2004
271	pcg	1.22	- protocol version 0.1, compatible with older releases.
272			- do not RESET on out-of-sequence packets (good for wireless).
273			- various non-security-related bugfixes.
274			- c++ify (at least make it compile with g++-3.4, which should make
275			it a little bit more standard c++).
276	pcg	1.19
277	pcg	1.18	1.5 Fri Jan 30 00:50:04 CET 2004
278	pcg	1.22	- protocol version 0.1, compatible with older releases.
279			- vped will refuse to start when hostkey and public key do not match.
280			- updated lzf code to version 1.2.
281			- better error reporting for "unusual" conditions, like failing
282			to allocate memory, that should not normally happen and
283			will otherwise result in spurious other error messages. Also
284			adds paranoid checks in case openssl's API changes in a bad way.
285			- fix a bug where queued vpn packets were cleared to zero. while
286			this doesn't affect security, it did cause warning messages and
287			unnecessary connectivity delays.
288	pcg	1.15
289	pcg	1.13	1.4 Sat Jan 17 15:49:21 CET 2004
290	pcg	1.22	- protocol version 0.1, compatible with older releases.
291			- better retry behaviour on key mismatch.
292			- use select-based io_manager instead of poll-based one.
293			- share io manager between rxvt-unicode and vpe.
294			- sooo many *BSD workarounds because no BSD I could find is even
295			remotely POSIX-compatible.
296	pcg	1.11
297	pcg	1.10	1.2 Fri Oct 17 03:44:44 CEST 2003
298	pcg	1.22	- protocol version 0.1.
299			- tincd kernel interface code imported, more supported platforms
300			(native/linux (2.4), tincd/linux (2.2 and 2.4), tincd/freebsd,
301			native/cygwin).
302			- added primitive ethernet emulation (ipv4 only), which allows
303			the following platforms that only have tun drivers to work:
304			/* none yet tested */
305			- portability workarounds, especially for unfriendly freebsd
306			- very minor bugfixes
307			- warnings when choosing insecure ciphers/hashes
308			- reduced default hmac length to 8.
309			- cvs now contains configure, Makefile.in and other generated files.
310			- added doc/complex-example to the distribution.
311
312			1.0 distant past
313			- protocol version 0.1.
314			- tweaked various timeouts to help very slow (486) class
315			machines or nets with many hosts.
316			- tweaked rate-limiting to be more forgiving for hosts
317			connecting through routers (not a fix).
318	pcg	1.2