[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: ecdh to avoid session replay attacks
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

proposed: 3 types, req, resreq, res

req (hmac1) rsa(seqno1 hmac1 aes1 seqno2 hmac2 aes2 auth) ecdh1
res (hmac1) hash(rsa-contents) ecdh2

req hmac0(*) rsa(seqno hmac0 hmac aes auth) hkdf-salt ecdh1
res hmac0(rsa-contents ecdh2)
   hmac_key = hkdf(hkdf-salt, hmac | ecdh)
   aes_key  = hkdf(hkdf-salt, aes  | ecdh)

        - INCOMPATIBLE CHANGE: core protocol version 1.0.
        - while individual packets couldn't be replayed, a whole session
          could be replayed - this has been fixed by an extra key exchange.
        - 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.
        - RAND_bytes was used when generating session keys, potentially
          leading to temporary freezes when entropy was low.
        - 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.

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 imterval 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 alises 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:	1.114
Committed:	Tue Jul 16 16:44:36 2013 UTC (10 years, 9 months ago) by root
Branch:	MAIN
Changes since 1.113:	+31 -0 lines
Log Message:	3.x
#	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: ecdh to avoid session replay attacks
9			TODO: http://incog-izick.blogspot.de/2011/08/using-openssl-aes-gcm.html
10			TODO: http://stackoverflow.com/questions/12153009/openssl-c-example-of-aes-gcm-using-evp-interfaces
11
12			proposed: 3 types, req, resreq, res
13
14			req (hmac1) rsa(seqno1 hmac1 aes1 seqno2 hmac2 aes2 auth) ecdh1
15			res (hmac1) hash(rsa-contents) ecdh2
16
17			req hmac0(*) rsa(seqno hmac0 hmac aes auth) hkdf-salt ecdh1
18			res hmac0(rsa-contents ecdh2)
19			hmac_key = hkdf(hkdf-salt, hmac \| ecdh)
20			aes_key = hkdf(hkdf-salt, aes \| ecdh)
21
22			- INCOMPATIBLE CHANGE: core protocol version 1.0.
23			- while individual packets couldn't be replayed, a whole session
24			could be replayed - this has been fixed by an extra key exchange.
25			- in addition to rsa key exchange and authentication, the handshake now
26			adds a diffie-hellman key exchange (using curve25119) for perfect
27			forward secrecy. mac and cipher keys are derived using HKDF.
28			- rsa key sizes are now configurable and larger (default is 3072).
29			correspondingly, the minimum mtu is no longer 296 but 576.
30			- fixed a potential (unverified) buffer overrun on rsa decryption.
31			- RAND_bytes was used when generating session keys, potentially
32			leading to temporary freezes when entropy was low.
33			- gvpectrl no longer generates all missing public keys, but
34			only missing private keys. private keys are also put
35			into the configured location.
36			- the pid-file now accepts %s as nodename as elsewhere.
37	root	1.106
38	root	1.114	2.25 Sat Jul 13 06:42:33 CEST 2013
39	root	1.97	- INCOMPATIBLE CHANGE: no longer enable udp protocol if no other
40			protocols are enabled - this is necessary when you have nodes with
41			completely unknown protocols, to force mediated connection requests.
42	root	1.99	- INCOMPATIBLE CHANGE: dns transport protocol bumped to version 2.
43	root	1.112	- core protocol version 0.1, compatible with older releases.
44	root	1.110	- switch to using RSA_generate_key_ex, which is the badly documented
45	root	1.108	and needlessly more complicated replacement for the RSA_generate_key
46			function which is now deprecated.
47	root	1.112	- support additional hmac hashes: sha256 and sha512, usually truncated.
48	root	1.108	- change public exponent for rsa keys from 65535 to 65537, for
49	root	1.110	efficiency reasons - only affects new keys.
50	root	1.105	- nodes would sometimes declare transport endpoints valid despite
51			the protocol not being configured locally.
52	root	1.106	- new global configuration options: chroot, chuser, chuid, chgid,
53			to chroot to a specified or anonymous new root, and change user id.
54	root	1.112	- new global configuration options seed_device and seed_interval,
55			to configure another device than /dev/urandom for random seeds,
56			and to configure a regular imterval to reseed the rng.
57	root	1.107	- prefer inet_aton over gethostbyname, as the latter is not guaranteed
58			to "resolve" literal ip addresses.
59	root	1.102	- configure didn't detect openssl 1.0 because SHA1_version became private
60			(patch by TANIGUCHI Takaki).
61	root	1.97	- fix a bug where nodes would tell the other side that it supports
62			the same protocols as that other side, instead of its own.
63	root	1.98	- add zlib when found, as openssl depends on it in newer versions.
64			- work around append-bugs in uclibc by using an extra seek.
65	root	1.99	- new "include" directive for the config file.
66	root	1.100	- gvpectrl no longer evaluates any "on" directives.
67	root	1.102	- icmp and rawip protocols weren't upgradable to each other.
68	root	1.99	- major, but incremental, dns transport improvements:
69			- do not simply abort in some error cases in the dns transport,
70			but try to recover.
71			- allow lowercase/uppercase alises for base-n encodings that do
72			not rely on case.
73			- use base26 instead of base22 encoding for dns syn's, and
74			base36 instead of base22 for headers (saves one byte/packet).
75			- back off far quicker in dns tunnel when idling - increases
76			latency on an idle link somewhat, but avoids hundreds of
77			needless packets.
78			- poll more aggressively when idling in dns (poll once per
79			second as opposed to once per 5 seconds).
80	root	1.104	- reduce dns send payload size to allow greater rate of ack
81			messages (should help sack and ipv6).
82	root	1.103	- allow for ip options in rawip/icmp transports, even though gvpe
83			doesn't generate them.
84	root	1.113	- upgrade to autoconf 2.69, automake 1.11.
85	root	1.101	- upgrade to libev 4 API.
86	root	1.113	- replace COPYING file by actual GPLv3 - files were relicensed to GPLv3
87			earlier but COPYING was forgotten.
88	root	1.97
89			2.24 Sat Feb 12 05:15:48 CET 2011
90			- protocol version 0.1, compatible with older releases.
91	root	1.95	- due to a bug, when packets were lost, a connection could go into a
92	root	1.94	state where a ping/connection request from another node would be
93	root	1.96	ignored, leading to connections not being re-established.
94	pcg	1.93	- due to a bug, compression was almost always enabled.
95	pcg	1.92	- enable-max-mtu was actually enable-mtu, contrary to documentation.
96	pcg	1.90	- add nfmark support.
97	pcg	1.91	- add node-change script support.
98			- new DESTSI variable for node-xxx scripts.
99	root	1.95	- updated codingstyle a bit, declared truly static stuff as static.
100	root	1.96	- clarify compression docs.
101	pcg	1.90
102	pcg	1.89	2.22 Sun Feb 1 17:25:28 CET 2009
103	root	1.97	- protocol version 0.1, compatible with older releases.
104	pcg	1.86	- enabled icmp/tcp/http-proxy protocols by default.
105	pcg	1.85	- updated copyright in program greetings.
106	pcg	1.86	- fix some configure messages.
107	pcg	1.87	- updated to libev 3.52.
108	pcg	1.85
109	pcg	1.84	2.21 Wed Sep 3 06:56:27 CEST 2008
110	root	1.97	- protocol version 0.1, compatible with older releases.
111	pcg	1.84	- add missing ev++.h include header to tarball, which everybody
112			who tested it apparently had in their include path :(. Caught
113	pcg	1.85	by Karl Kleinpaste and Marcus Kong.
114	pcg	1.84
115	pcg	1.83	2.2 Mon Sep 1 06:28:09 CEST 2008
116	root	1.97	- protocol version 0.1, compatible with older releases.
117	pcg	1.78	but upgrade is recommended to due changed ondemand behaviour.
118			- new per-node options max-ttl and max-queue.
119	pcg	1.72	- convert from iom.C to libev, a high-performance event loop
120	pcg	1.71	(http://software.schmorp.de/pkg/libev).
121	pcg	1.73	- tcp connections were leaking in some cases.
122	pcg	1.78	- retry more aggressively (once/s) to establish a connection if
123			new packets arrive for it.
124	pcg	1.75	- save a lot of setsockopt calls when the tos doesn't change.
125	pcg	1.78	- honor disabled even on initial connect attempt.
126	pcg	1.76	- changed callback mechanism to be slightly less portable
127			but more efficient mechanism (standards-compliant c++ compilers
128			should work).
129	pcg	1.80	- increased receive window positive size, to allow for massive
130			packet loss due to occasional longer drop-outs.
131			- send RST when a positive window size violation is detected, but
132			not in other cases, to reconnect more quickly.
133	pcg	1.83	- upgraded liblzf to version 3.4.
134	pcg	1.77	- dropped -fno-exceptions due to ev++.h using it.
135	pcg	1.81	- node-up/down scripts are now run in sequence.
136			- new -q switch for gvpectrl, for when you run it often.
137	pcg	1.82	- work around the horribly inconsistent, ad-hoc, ever-changing
138			and broken texinfo syntax. YMMV. avoid texinfo.
139	pcg	1.83	- keepalive is more aggressive now, sensding ping's every 3 seconds
140			and killing the conenction after 15 seconds.
141	pcg	1.71	- bugfixes.
142
143	pcg	1.70	2.01 Thu Mar 29 19:26:04 CEST 2007
144	pcg	1.69	- protocol version 0.1, compatible with older releases.
145	pcg	1.68	- bugfix of callback.h, might have cause callback return values to
146			be corrupted on architectures like sparc before.
147	pcg	1.69	- dns transport retries more aggressively.
148	pcg	1.70	- updated documentation, improved dns transport reliability
149			and throughput.
150			- added experimental support for sha256 and sha512 digests.
151	pcg	1.67
152	pcg	1.66	2.0 Mon Dec 5 13:59:26 CET 2005
153	pcg	1.56	- protocol version 0.1, compatible with older releases.
154	pcg	1.65	- implement allow-direct, deny-direct node config statements.
155	pcg	1.59	- implemented != for sockinfo. This fixes a bug where
156			gvpe sent packets to the old ip address of another host
157			even though it had received packets from it's new address.
158	pcg	1.61	This only causes problems if you forget to -HUP your gvpe after
159	pcg	1.59	your ip address changed, which is required.
160	pcg	1.64	- sets close-on-exec flag on tcp connections. This fixes a bug
161			where child processes kept tcp connections open and caused
162			connections to fail when only one side can connect.
163			- fixed a bug in receive sequence checking that made gvpe
164			accept out-of-window packets in most cases.
165	pcg	1.61	- tighter limit for the maximum sequence # to avoid overflow
166			conditions + allow more headroom for packet reordering.
167	pcg	1.66	- replace some asserts that trapped config mismatches by
168	pcg	1.62	more useful log messages.
169	pcg	1.63	- fix spurious extra newline in some log messages.
170	pcg	1.56
171	pcg	1.55	1.9 Tue Apr 19 06:21:50 CEST 2005
172	pcg	1.56	- protocol version 0.1, compatible with older releases.
173	pcg	1.49	- WARNING: this version checks the return value of if-up etc.
174			scripts and exits on failure.
175	pcg	1.50	- IMPORTANT: run if-up/node-up etc. scripts via /bin/sh.
176			- IMPORTANT: interface initialization (MAC, MTU) is now done
177			automatically in most configurations.
178	pcg	1.54	- options can now be specified on the gvpe command line, too.
179	pcg	1.49	- make some DNS transport values configurable and document them.
180			- improved OS specific information in gvpe.osdep(5).
181	pcg	1.51	- new tap device type "native/darwin", that supports the tap
182	pcg	1.45	driver available for darwin (thanks to matthew mead who tested
183	pcg	1.47	it out with me in a long session). tincd/darwin is still available.
184	pcg	1.51	- new device type "tincd/bsd", which is a newer version of the
185			*bsd-drivers taken from tinc.
186	pcg	1.46	- fixed a bug in relying on the order of global construction
187			when tcp transport was enabled. The fix makes it use no
188			cpu time unless it is in use, too.
189	pcg	1.52	- information about other nodes is now available to if-up etc. scripts.
190			- the value of the config variable if-up-data is passed to the if-up
191			etc. scripts.
192	pcg	1.49	- skip unparsable config lines with a warning instead of stopping
193			parsing and continuing with a certainly unusable config.
194	pcg	1.43
195	pcg	1.41	1.8 Fri Mar 18 00:58:55 CET 2005
196	pcg	1.56	- protocol version 0.1, compatible with older releases.
197	pcg	1.36	- enable-udp = yes is now default only when no other protocols
198			are enabled. otherwise it is disabled unless explicitly enabled.
199	pcg	1.40	- implemented dns tunneling (experimental now and in the future).
200	pcg	1.39	- remove support for pre-release version protocol.
201	pcg	1.41	- updated tincd drivers (rev 1433), added uml_socket driver, documented
202			tincd drivers a bit better.
203	pcg	1.40	- document icmp configuration values.
204			- document transport protocols in gvpe.protocol(7).
205			- remove unused ChangeLog file.
206	pcg	1.41	- created a mailinglist at gvpe@lists.schmorp.de.
207			- added an exemption to allow distribution of binaries linked against
208			OpenSSL, as suggested by Guus Sliepen (author of tinc). No
209			GNUTLS conversion in sight.
210	pcg	1.42	- some portability fixes with respect to --disable-nls.
211	pcg	1.36
212	pcg	1.35	1.7 Tue Feb 22 23:58:59 CET 2005
213	pcg	1.32	- protocol version 0.1, compatible with older releases.
214	pcg	1.26	- first gnu release.
215	pcg	1.27	- documented the special value 1 for router-priority.
216	pcg	1.26	- renamed vped => gvpe and vpectrl => gvpectrl, as well as
217			vped.conf => gvpe.conf.
218	pcg	1.29	- new per-node option "max-retry".
219	pcg	1.22	- asymmetric rekeying behaviour, so hosts don't rekey simultaneously.
220	pcg	1.24	- new configure option --enable-static-daemon.
221	pcg	1.23	- fix configure --help output.
222	pcg	1.26	- many documentation layout fixes.
223	pcg	1.28	- synced iom.[Ch] from rxvt-unicode.
224	pcg	1.34	- try to cope with some non-monotonic time changes.
225	pcg	1.30	- revert to locale.h - a usual, clocale is nonfunctioning on macosx.
226	pcg	1.32	- considerably improved pod2texi and the resulting texi doc.
227	pcg	1.22
228	pcg	1.21	1.6.1 Wed May 12 14:48:20 CEST 2004
229	pcg	1.32	- protocol version 0.1, compatible with older releases.
230	pcg	1.22	- fix -c switch that has been broken due to a last-minute fix
231			to option and config file parsing.
232	pcg	1.21
233	pcg	1.20	1.6 Mon May 10 20:55:10 CEST 2004
234	pcg	1.22	- protocol version 0.1, compatible with older releases.
235			- do not RESET on out-of-sequence packets (good for wireless).
236			- various non-security-related bugfixes.
237			- c++ify (at least make it compile with g++-3.4, which should make
238			it a little bit more standard c++).
239	pcg	1.19
240	pcg	1.18	1.5 Fri Jan 30 00:50:04 CET 2004
241	pcg	1.22	- protocol version 0.1, compatible with older releases.
242			- vped will refuse to start when hostkey and public key do not match.
243			- updated lzf code to version 1.2.
244			- better error reporting for "unusual" conditions, like failing
245			to allocate memory, that should not normally happen and
246			will otherwise result in spurious other error messages. Also
247			adds paranoid checks in case openssl's API changes in a bad way.
248			- fix a bug where queued vpn packets were cleared to zero. while
249			this doesn't affect security, it did cause warning messages and
250			unnecessary connectivity delays.
251	pcg	1.15
252	pcg	1.13	1.4 Sat Jan 17 15:49:21 CET 2004
253	pcg	1.22	- protocol version 0.1, compatible with older releases.
254			- better retry behaviour on key mismatch.
255			- use select-based io_manager instead of poll-based one.
256			- share io manager between rxvt-unicode and vpe.
257			- sooo many *BSD workarounds because no BSD I could find is even
258			remotely POSIX-compatible.
259	pcg	1.11
260	pcg	1.10	1.2 Fri Oct 17 03:44:44 CEST 2003
261	pcg	1.22	- protocol version 0.1.
262			- tincd kernel interface code imported, more supported platforms
263			(native/linux (2.4), tincd/linux (2.2 and 2.4), tincd/freebsd,
264			native/cygwin).
265			- added primitive ethernet emulation (ipv4 only), which allows
266			the following platforms that only have tun drivers to work:
267			/* none yet tested */
268			- portability workarounds, especially for unfriendly freebsd
269			- very minor bugfixes
270			- warnings when choosing insecure ciphers/hashes
271			- reduced default hmac length to 8.
272			- cvs now contains configure, Makefile.in and other generated files.
273			- added doc/complex-example to the distribution.
274
275			1.0 distant past
276			- protocol version 0.1.
277			- tweaked various timeouts to help very slow (486) class
278			machines or nets with many hosts.
279			- tweaked rate-limiting to be more forgiving for hosts
280			connecting through routers (not a fix).
281	pcg	1.2