[ViewVC] Annotation of: cvs/gvpe/NEWS

GVPE NEWS

TODO: bridge mode, finally?
TODO: gcm mode?
TODO: replace ripemd160 as the only authentication hash.
TODO: increase rsa size.
TODO: replace transport bits by transport endpoint structs?
TODO: http://incog-izick.blogspot.de/2011/08/using-openssl-aes-gcm.html
TODO: http://stackoverflow.com/questions/12153009/openssl-c-example-of-aes-gcm-using-evp-interfaces

TODO: verify
TODO: make sense of overhead calculation
TODO: if-up &c should not be scripts?
TODO: ipv6
TODO: gvpectrl should not use default privatekey,. or maybe document it better
        - INCOMPATIBLE CHANGE: core protocol version 1.0.
        - INCOMPATIBLE CHANGE: node sections are now introduced
          with "node nodename", not "node = nodename".
        - 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 conenction 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.
          
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:	1.126
Committed:	Fri Apr 24 21:55:29 2015 UTC (9 years ago) by root
Branch:	MAIN
Changes since 1.125:	+1 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.83	GVPE NEWS
2	pcg	1.57
3	root	1.106	TODO: bridge mode, finally?
4	root	1.112	TODO: gcm mode?
5			TODO: replace ripemd160 as the only authentication hash.
6			TODO: increase rsa size.
7	root	1.114	TODO: replace transport bits by transport endpoint structs?
8			TODO: http://incog-izick.blogspot.de/2011/08/using-openssl-aes-gcm.html
9			TODO: http://stackoverflow.com/questions/12153009/openssl-c-example-of-aes-gcm-using-evp-interfaces
10
11	root	1.116	TODO: verify
12			TODO: make sense of overhead calculation
13	root	1.117	TODO: if-up &c should not be scripts?
14	root	1.121	TODO: ipv6
15	root	1.122	TODO: gvpectrl should not use default privatekey,. or maybe document it better
16	root	1.114	- INCOMPATIBLE CHANGE: core protocol version 1.0.
17	root	1.123	- INCOMPATIBLE CHANGE: node sections are now introduced
18	root	1.116	with "node nodename", not "node = nodename".
19	root	1.114	- while individual packets couldn't be replayed, a whole session
20			could be replayed - this has been fixed by an extra key exchange.
21	root	1.126	- fix a delete vs. delete [] mismatch in the central logging function.
22	root	1.114	- in addition to rsa key exchange and authentication, the handshake now
23			adds a diffie-hellman key exchange (using curve25119) for perfect
24			forward secrecy. mac and cipher keys are derived using HKDF.
25			- rsa key sizes are now configurable and larger (default is 3072).
26			correspondingly, the minimum mtu is no longer 296 but 576.
27			- fixed a potential (unverified) buffer overrun on rsa decryption.
28	root	1.120	- new per-node low-power setting that tries to reduce cpu/network usage.
29	root	1.119	- router reconnects could cause excessive rekeying on other connections.
30	root	1.114	- gvpectrl no longer generates all missing public keys, but
31			only missing private keys. private keys are also put
32			into the configured location.
33			- the pid-file now accepts %s as nodename as elsewhere.
34	root	1.124	- switch to counter mode (only aes supported at the moment in
35			openssl). this gets rid of the need to generate a random iv,
36			is likely more secure (and, as a side effect, gets rid of
37			slow randomness generation. counter mode is often faster
38	root	1.125	then cbc mode as well, and packets are smaller).
39	root	1.115	- no longer use RAND_bytes to generate session keys - you NEED
40			a real source of entropy now (e.g. egd or /dev/random - see the
41			openssl documentation).
42	root	1.116	- multiple node statements for the same node are now supported
43			and will be merged.
44			- a new directive "global" switches back to the global section
45			of the config file.
46			- if-up scripts can now be specified with absolute paths.
47	root	1.117	- new global option: serial, to detect configuration mismatches.
48	root	1.118	- use HKDF as authentication proof, not HMAC or a plain hash
49			(hint by Ilmari Karonen).
50	root	1.119	- during rekeying or conenction establishments, hmac authentication
51			errors could occur and reset the connection. Transient hmac
52			authentication errors are now being ignored for 3 seconds.
53			- log the reason for a conneciton loss.
54	root	1.121	- use a (hopefully) constant time memcmp to compare internal secrets.
55	root	1.116
56	root	1.114	2.25 Sat Jul 13 06:42:33 CEST 2013
57	root	1.97	- INCOMPATIBLE CHANGE: no longer enable udp protocol if no other
58			protocols are enabled - this is necessary when you have nodes with
59			completely unknown protocols, to force mediated connection requests.
60	root	1.99	- INCOMPATIBLE CHANGE: dns transport protocol bumped to version 2.
61	root	1.112	- core protocol version 0.1, compatible with older releases.
62	root	1.110	- switch to using RSA_generate_key_ex, which is the badly documented
63	root	1.108	and needlessly more complicated replacement for the RSA_generate_key
64			function which is now deprecated.
65	root	1.112	- support additional hmac hashes: sha256 and sha512, usually truncated.
66	root	1.108	- change public exponent for rsa keys from 65535 to 65537, for
67	root	1.110	efficiency reasons - only affects new keys.
68	root	1.105	- nodes would sometimes declare transport endpoints valid despite
69			the protocol not being configured locally.
70	root	1.106	- new global configuration options: chroot, chuser, chuid, chgid,
71			to chroot to a specified or anonymous new root, and change user id.
72	root	1.112	- new global configuration options seed_device and seed_interval,
73			to configure another device than /dev/urandom for random seeds,
74	root	1.116	and to configure a regular interval to reseed the rng.
75	root	1.107	- prefer inet_aton over gethostbyname, as the latter is not guaranteed
76			to "resolve" literal ip addresses.
77	root	1.102	- configure didn't detect openssl 1.0 because SHA1_version became private
78			(patch by TANIGUCHI Takaki).
79	root	1.97	- fix a bug where nodes would tell the other side that it supports
80			the same protocols as that other side, instead of its own.
81	root	1.98	- add zlib when found, as openssl depends on it in newer versions.
82			- work around append-bugs in uclibc by using an extra seek.
83	root	1.99	- new "include" directive for the config file.
84	root	1.100	- gvpectrl no longer evaluates any "on" directives.
85	root	1.102	- icmp and rawip protocols weren't upgradable to each other.
86	root	1.99	- major, but incremental, dns transport improvements:
87			- do not simply abort in some error cases in the dns transport,
88			but try to recover.
89	root	1.116	- allow lowercase/uppercase aliases for base-n encodings that do
90	root	1.99	not rely on case.
91			- use base26 instead of base22 encoding for dns syn's, and
92			base36 instead of base22 for headers (saves one byte/packet).
93			- back off far quicker in dns tunnel when idling - increases
94			latency on an idle link somewhat, but avoids hundreds of
95			needless packets.
96			- poll more aggressively when idling in dns (poll once per
97			second as opposed to once per 5 seconds).
98	root	1.104	- reduce dns send payload size to allow greater rate of ack
99			messages (should help sack and ipv6).
100	root	1.103	- allow for ip options in rawip/icmp transports, even though gvpe
101			doesn't generate them.
102	root	1.113	- upgrade to autoconf 2.69, automake 1.11.
103	root	1.101	- upgrade to libev 4 API.
104	root	1.113	- replace COPYING file by actual GPLv3 - files were relicensed to GPLv3
105			earlier but COPYING was forgotten.
106	root	1.97
107			2.24 Sat Feb 12 05:15:48 CET 2011
108			- protocol version 0.1, compatible with older releases.
109	root	1.95	- due to a bug, when packets were lost, a connection could go into a
110	root	1.94	state where a ping/connection request from another node would be
111	root	1.96	ignored, leading to connections not being re-established.
112	pcg	1.93	- due to a bug, compression was almost always enabled.
113	pcg	1.92	- enable-max-mtu was actually enable-mtu, contrary to documentation.
114	pcg	1.90	- add nfmark support.
115	pcg	1.91	- add node-change script support.
116			- new DESTSI variable for node-xxx scripts.
117	root	1.95	- updated codingstyle a bit, declared truly static stuff as static.
118	root	1.96	- clarify compression docs.
119	pcg	1.90
120	pcg	1.89	2.22 Sun Feb 1 17:25:28 CET 2009
121	root	1.97	- protocol version 0.1, compatible with older releases.
122	pcg	1.86	- enabled icmp/tcp/http-proxy protocols by default.
123	pcg	1.85	- updated copyright in program greetings.
124	pcg	1.86	- fix some configure messages.
125	pcg	1.87	- updated to libev 3.52.
126	pcg	1.85
127	pcg	1.84	2.21 Wed Sep 3 06:56:27 CEST 2008
128	root	1.97	- protocol version 0.1, compatible with older releases.
129	pcg	1.84	- add missing ev++.h include header to tarball, which everybody
130			who tested it apparently had in their include path :(. Caught
131	pcg	1.85	by Karl Kleinpaste and Marcus Kong.
132	pcg	1.84
133	pcg	1.83	2.2 Mon Sep 1 06:28:09 CEST 2008
134	root	1.97	- protocol version 0.1, compatible with older releases.
135	pcg	1.78	but upgrade is recommended to due changed ondemand behaviour.
136			- new per-node options max-ttl and max-queue.
137	pcg	1.72	- convert from iom.C to libev, a high-performance event loop
138	pcg	1.71	(http://software.schmorp.de/pkg/libev).
139	pcg	1.73	- tcp connections were leaking in some cases.
140	pcg	1.78	- retry more aggressively (once/s) to establish a connection if
141			new packets arrive for it.
142	pcg	1.75	- save a lot of setsockopt calls when the tos doesn't change.
143	pcg	1.78	- honor disabled even on initial connect attempt.
144	pcg	1.76	- changed callback mechanism to be slightly less portable
145			but more efficient mechanism (standards-compliant c++ compilers
146			should work).
147	pcg	1.80	- increased receive window positive size, to allow for massive
148			packet loss due to occasional longer drop-outs.
149			- send RST when a positive window size violation is detected, but
150			not in other cases, to reconnect more quickly.
151	pcg	1.83	- upgraded liblzf to version 3.4.
152	pcg	1.77	- dropped -fno-exceptions due to ev++.h using it.
153	pcg	1.81	- node-up/down scripts are now run in sequence.
154			- new -q switch for gvpectrl, for when you run it often.
155	pcg	1.82	- work around the horribly inconsistent, ad-hoc, ever-changing
156			and broken texinfo syntax. YMMV. avoid texinfo.
157	pcg	1.83	- keepalive is more aggressive now, sensding ping's every 3 seconds
158			and killing the conenction after 15 seconds.
159	pcg	1.71	- bugfixes.
160
161	pcg	1.70	2.01 Thu Mar 29 19:26:04 CEST 2007
162	pcg	1.69	- protocol version 0.1, compatible with older releases.
163	pcg	1.68	- bugfix of callback.h, might have cause callback return values to
164			be corrupted on architectures like sparc before.
165	pcg	1.69	- dns transport retries more aggressively.
166	pcg	1.70	- updated documentation, improved dns transport reliability
167			and throughput.
168			- added experimental support for sha256 and sha512 digests.
169	pcg	1.67
170	pcg	1.66	2.0 Mon Dec 5 13:59:26 CET 2005
171	pcg	1.56	- protocol version 0.1, compatible with older releases.
172	pcg	1.65	- implement allow-direct, deny-direct node config statements.
173	pcg	1.59	- implemented != for sockinfo. This fixes a bug where
174			gvpe sent packets to the old ip address of another host
175			even though it had received packets from it's new address.
176	pcg	1.61	This only causes problems if you forget to -HUP your gvpe after
177	pcg	1.59	your ip address changed, which is required.
178	pcg	1.64	- sets close-on-exec flag on tcp connections. This fixes a bug
179			where child processes kept tcp connections open and caused
180			connections to fail when only one side can connect.
181			- fixed a bug in receive sequence checking that made gvpe
182			accept out-of-window packets in most cases.
183	pcg	1.61	- tighter limit for the maximum sequence # to avoid overflow
184			conditions + allow more headroom for packet reordering.
185	pcg	1.66	- replace some asserts that trapped config mismatches by
186	pcg	1.62	more useful log messages.
187	pcg	1.63	- fix spurious extra newline in some log messages.
188	pcg	1.56
189	pcg	1.55	1.9 Tue Apr 19 06:21:50 CEST 2005
190	pcg	1.56	- protocol version 0.1, compatible with older releases.
191	pcg	1.49	- WARNING: this version checks the return value of if-up etc.
192			scripts and exits on failure.
193	pcg	1.50	- IMPORTANT: run if-up/node-up etc. scripts via /bin/sh.
194			- IMPORTANT: interface initialization (MAC, MTU) is now done
195			automatically in most configurations.
196	pcg	1.54	- options can now be specified on the gvpe command line, too.
197	pcg	1.49	- make some DNS transport values configurable and document them.
198			- improved OS specific information in gvpe.osdep(5).
199	pcg	1.51	- new tap device type "native/darwin", that supports the tap
200	pcg	1.45	driver available for darwin (thanks to matthew mead who tested
201	pcg	1.47	it out with me in a long session). tincd/darwin is still available.
202	pcg	1.51	- new device type "tincd/bsd", which is a newer version of the
203			*bsd-drivers taken from tinc.
204	pcg	1.46	- fixed a bug in relying on the order of global construction
205			when tcp transport was enabled. The fix makes it use no
206			cpu time unless it is in use, too.
207	pcg	1.52	- information about other nodes is now available to if-up etc. scripts.
208			- the value of the config variable if-up-data is passed to the if-up
209			etc. scripts.
210	pcg	1.49	- skip unparsable config lines with a warning instead of stopping
211			parsing and continuing with a certainly unusable config.
212	pcg	1.43
213	pcg	1.41	1.8 Fri Mar 18 00:58:55 CET 2005
214	pcg	1.56	- protocol version 0.1, compatible with older releases.
215	pcg	1.36	- enable-udp = yes is now default only when no other protocols
216			are enabled. otherwise it is disabled unless explicitly enabled.
217	pcg	1.40	- implemented dns tunneling (experimental now and in the future).
218	pcg	1.39	- remove support for pre-release version protocol.
219	pcg	1.41	- updated tincd drivers (rev 1433), added uml_socket driver, documented
220			tincd drivers a bit better.
221	pcg	1.40	- document icmp configuration values.
222			- document transport protocols in gvpe.protocol(7).
223			- remove unused ChangeLog file.
224	pcg	1.41	- created a mailinglist at gvpe@lists.schmorp.de.
225			- added an exemption to allow distribution of binaries linked against
226			OpenSSL, as suggested by Guus Sliepen (author of tinc). No
227			GNUTLS conversion in sight.
228	pcg	1.42	- some portability fixes with respect to --disable-nls.
229	pcg	1.36
230	pcg	1.35	1.7 Tue Feb 22 23:58:59 CET 2005
231	pcg	1.32	- protocol version 0.1, compatible with older releases.
232	pcg	1.26	- first gnu release.
233	pcg	1.27	- documented the special value 1 for router-priority.
234	pcg	1.26	- renamed vped => gvpe and vpectrl => gvpectrl, as well as
235			vped.conf => gvpe.conf.
236	pcg	1.29	- new per-node option "max-retry".
237	pcg	1.22	- asymmetric rekeying behaviour, so hosts don't rekey simultaneously.
238	pcg	1.24	- new configure option --enable-static-daemon.
239	pcg	1.23	- fix configure --help output.
240	pcg	1.26	- many documentation layout fixes.
241	pcg	1.28	- synced iom.[Ch] from rxvt-unicode.
242	pcg	1.34	- try to cope with some non-monotonic time changes.
243	pcg	1.30	- revert to locale.h - a usual, clocale is nonfunctioning on macosx.
244	pcg	1.32	- considerably improved pod2texi and the resulting texi doc.
245	pcg	1.22
246	pcg	1.21	1.6.1 Wed May 12 14:48:20 CEST 2004
247	pcg	1.32	- protocol version 0.1, compatible with older releases.
248	pcg	1.22	- fix -c switch that has been broken due to a last-minute fix
249			to option and config file parsing.
250	pcg	1.21
251	pcg	1.20	1.6 Mon May 10 20:55:10 CEST 2004
252	pcg	1.22	- protocol version 0.1, compatible with older releases.
253			- do not RESET on out-of-sequence packets (good for wireless).
254			- various non-security-related bugfixes.
255			- c++ify (at least make it compile with g++-3.4, which should make
256			it a little bit more standard c++).
257	pcg	1.19
258	pcg	1.18	1.5 Fri Jan 30 00:50:04 CET 2004
259	pcg	1.22	- protocol version 0.1, compatible with older releases.
260			- vped will refuse to start when hostkey and public key do not match.
261			- updated lzf code to version 1.2.
262			- better error reporting for "unusual" conditions, like failing
263			to allocate memory, that should not normally happen and
264			will otherwise result in spurious other error messages. Also
265			adds paranoid checks in case openssl's API changes in a bad way.
266			- fix a bug where queued vpn packets were cleared to zero. while
267			this doesn't affect security, it did cause warning messages and
268			unnecessary connectivity delays.
269	pcg	1.15
270	pcg	1.13	1.4 Sat Jan 17 15:49:21 CET 2004
271	pcg	1.22	- protocol version 0.1, compatible with older releases.
272			- better retry behaviour on key mismatch.
273			- use select-based io_manager instead of poll-based one.
274			- share io manager between rxvt-unicode and vpe.
275			- sooo many *BSD workarounds because no BSD I could find is even
276			remotely POSIX-compatible.
277	pcg	1.11
278	pcg	1.10	1.2 Fri Oct 17 03:44:44 CEST 2003
279	pcg	1.22	- protocol version 0.1.
280			- tincd kernel interface code imported, more supported platforms
281			(native/linux (2.4), tincd/linux (2.2 and 2.4), tincd/freebsd,
282			native/cygwin).
283			- added primitive ethernet emulation (ipv4 only), which allows
284			the following platforms that only have tun drivers to work:
285			/* none yet tested */
286			- portability workarounds, especially for unfriendly freebsd
287			- very minor bugfixes
288			- warnings when choosing insecure ciphers/hashes
289			- reduced default hmac length to 8.
290			- cvs now contains configure, Makefile.in and other generated files.
291			- added doc/complex-example to the distribution.
292
293			1.0 distant past
294			- protocol version 0.1.
295			- tweaked various timeouts to help very slow (486) class
296			machines or nets with many hosts.
297			- tweaked rate-limiting to be more forgiving for hosts
298			connecting through routers (not a fix).
299	pcg	1.2