[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)

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