Commit Graph

41 Commits

Author SHA1 Message Date
Ruslan Ermilov
642cd09fb3 Added boolean argument to link searching functions, indicating
whether they should create a link if lookup has failed or not.
2000-10-30 17:24:12 +00:00
Ruslan Ermilov
03453c5e87 A significant rewrite of PPTP aliasing code.
PPTP links are no longer dropped by simple (and inappropriate in this
case) "inactivity timeout" procedure, only when requested through the
control connection.

It is now possible to have multiple PPTP servers running behind NAT.
Just redirect the incoming TCP traffic to port 1723, everything else
is done transparently.

Problems were reported and the fix was tested by:
		Michael Adler <Michael.Adler@compaq.com>,
		David Andersen <dga@lcs.mit.edu>
2000-10-30 12:39:41 +00:00
Ruslan Ermilov
f136389613 A failure to allocate memory for auxiliary TCP data is now fatal.
This fixes a null pointer dereference problem that is unlikely to
happen in normal circumstances.
2000-10-19 10:44:44 +00:00
Ruslan Ermilov
305d10699e Create aliasing links for incoming ICMP echo/timestamp requests.
This makes outgoing ICMP echo/timestamp replies to be de-aliased
with the right source IP, not exactly the primary aliasing IP.
2000-08-31 12:47:57 +00:00
Ruslan Ermilov
a05f06d79f Fixed PunchFW code segmentation violation bug.
Reported by:	Christian Schade <chris@cube.sax.de>
2000-08-14 15:24:47 +00:00
Ruslan Ermilov
b834663f47 Use queue(3) LIST_* macros for doubly-linked lists. 2000-08-14 14:18:16 +00:00
Archie Cobbs
642e43b39b Add address translation support for RTSP/RTP used by RealPlayer and
Quicktime streaming media applications.

Add a BUGS section to the man page.

Submitted by:	Erik Salander <erik@whistle.com>
2000-07-26 23:15:46 +00:00
Ruslan Ermilov
36e6576b44 Fixed PunchFWHole():
- ipfw always rejected rule with `neither in nor out' diagnostics.
- number of src/dst ports was not set properly.
2000-06-27 14:56:07 +00:00
Ruslan Ermilov
d15583713a - Removed PacketAliasPptp() API function.
- SHLIB_MAJOR++.
2000-06-20 13:07:52 +00:00
Ruslan Ermilov
55a39fc5a2 Added true support for PPTP aliasing. Some nice features include:
- Multiple PPTP clients behind NAT to the same or different servers.

- Single PPTP server behind NAT -- you just need to redirect TCP
  port 1723 to a local machine.  Multiple servers behind NAT is
  possible but would require a simple API change.

- No API changes!

For more information on how this works see comments at the start of
the alias_pptp.c.

PacketAliasPptp() is no longer necessary and will be removed soon.

Submitted by:	Erik Salander <erik@whistle.com>
Reviewed by:	ru
Rewritten by:	ru
Reviewed by:	Erik Salander <erik@whistle.com>
2000-06-20 11:41:48 +00:00
Ruslan Ermilov
7652512976 - Added support for passive mode FTP by aliasing 227 replies.
It does mean that it is now possible to run passive-mode FTP
  server behind NAT.

- SECURITY: FTP aliasing engine now ensures that:
  o the segment preceding a PORT/227 segment terminates with a \r\n;
  o the IP address in the PORT/227 matches the source IP address of
    the packet;
  o the port number in the PORT command or 277 reply is greater than
    or equal to 1024.

Submitted by:	Erik Salander <erik@whistle.com>
Reviewed by:	ru
2000-06-14 16:09:35 +00:00
Brian Somers
151682eadc Revert the default behaviour for incoming connections so
that they (once again) go to the target machine rather than
the alias address.

PR:		18354
Submitted by:	ru
2000-05-11 07:52:21 +00:00
Ruslan Ermilov
8060760500 Replace PacketAliasRedirectPptp() (which had nothing specific
to PPTP) with more generic PacketAliasRedirectProto().

Major number is not bumped because it is believed that noone
has started using PacketAliasRedirectPptp() yet.
2000-04-28 13:44:49 +00:00
Ruslan Ermilov
6d20a77450 Load Sharing using IP Network Address Translation (RFC 2391, LSNAT).
LSNAT links are first created by either PacketAliasRedirectPort() or
PacketAliasRedirectAddress() and then set up by one or more calls to
PacketAliasAddServer().
2000-04-27 17:37:03 +00:00
Ruslan Ermilov
483d2f2296 Add support for multiple PPTP sessions:
- new API function: PacketAliasRedirectPptp()
- new mode bit: PKT_ALIAS_DENY_PPTP

Please see manual page for details.
2000-04-18 10:18:21 +00:00
Ruslan Ermilov
b5e819ec23 Apply TCP_EXPIRE_CONNECTED (86400 seconds) timeout only to established
connections, after SYN packets were seen from both ends.  Before this,
it would get applied right after the first SYN packet was seen (either
from client or server).  With broken TCP connection attempts, when the
remote end does not respond with SYNACK nor with RST, this resulted in
having a useless (ie, no actual TCP connection associated with it) TCP
link with 86400 seconds TTL, wasting system memory.  With high rate of
such broken connection attempts (for example, remote end simply blocks
these connection attempts with ipfw(8) without sending RST back), this
could result in a denial-of-service.

PR:		bin/17963
2000-04-14 15:34:55 +00:00
Ruslan Ermilov
f167e54283 Make partially specified permanent links without `dst_addr'
but with `dst_port' work for outgoing packets.

This case was not handled properly when I first fixed this
in revision 1.17.

This change is also required for the upcoming improved PPTP
support patches -- that is how I found the problem.

Before this change:

# natd -v -a aliasIP \
  -redirect_port tcp localIP:localPORT publicIP:publicPORT 0:remotePORT

Out [TCP]  [TCP] localIP:localPORT -> remoteIP:remotePORT aliased to
           [TCP] aliasIP:localPORT -> remoteIP:remotePORT

After this change:

# natd -v -a aliasIP \
  -redirect_port tcp localIP:localPORT publicIP:publicPORT 0:remotePORT

Out [TCP]  [TCP] localIP:localPORT -> remoteIP:remotePORT aliased to
           [TCP] publicIP:publicPORT -> remoteIP:remotePORT
2000-04-12 18:44:50 +00:00
Brian Somers
5dd44916b7 Allow PacketAliasSetTarget() to be passed the following:
INADDR_NONE:   Incoming packets go to the alias address (the default)
  INADDR_ANY:    Incoming packets are not NAT'd (direct access to the
                 internal network from outside)
  anything else: Incoming packets go to the specified address

Change a few inaddr::s_addr == 0 to inaddr::s_addr == INADDR_ANY
while I'm there.
2000-03-31 20:36:29 +00:00
Brian Somers
1c4e6d2544 When an incoming packet is received that is not specifically
redirected and when no target address has been specified, NAT
the destination address to the alias address rather than
allowing people direct access to your internal network from
outside.
2000-03-31 14:03:37 +00:00
Brian Somers
9da582e318 Make _FindLinkIn() static and only define GetDestPort when
NO_FW_PUNCH isn't defined.
2000-03-19 09:11:05 +00:00
Archie Cobbs
a9405f0edb Fix a '&&' that should have been a '&'.
Submitted by:	Erik Salander <erik@whistle.com>
1999-12-10 20:04:53 +00:00
Ruslan Ermilov
838d9af2c8 Properly handle the case when either the aliasing or source address of
the link are equal to the default aliasing address.  Do not zero them!

This will fix the problem with non-working links added with the source
and/or aliasing address equal to the default aliasing address, but the
default aliasing address is set later, after the link has been set up,
like both natd(8) and ppp(8) do (for objective reasons).

Reviewed by:	Brian Somers <brian@FreeBSD.org>,
		Eivind Eklund <eivind@FreeBSD.org>,
		Charles Mott <cmott@srv.net>
1999-09-27 08:40:36 +00:00
Ruslan Ermilov
bd3ed4542d ReLink() partial links in FindLinkOut() in the same manner as we do it
in FindLinkIn().  This will make TcpMonitorIn()/TcpMonitorOut() happy.

Reviewed by:	eivind
1999-09-22 13:22:26 +00:00
Ruslan Ermilov
f3baa77e5e Restore previous version of FindLinkIn().
Instead, natd(8) should be fixed to call PacketAliasSetAddress()
as part of initialization, as required by libalias(3).
1999-09-21 14:44:32 +00:00
Ruslan Ermilov
02136bf8b0 - Make partially specified permanent links (without `dst_addr' and/or
`dst_port') work for outgoing packets.

- Make permanent links whose `alias_addr' matches the primary aliasing
  address `aliasAddress' work for incoming packets.

- Typo fixes.

Reviewed by:	brian, eivind
1999-09-21 08:40:20 +00:00
Brian Somers
32277d8b6d sys/errno.h -> errno.h 1999-09-21 01:26:49 +00:00
Bill Fumerola
a5a388c7ab Add $FreeBSD$ and spell Eklund properly.
Approved by:	brian (well, he approved adding $Id$)
1999-08-29 23:17:04 +00:00
Eivind Eklund
5164f52665 Make incoming packets work as keepalives, too. This should fix problems
for some games.

Notified of problem by:	tim@turbinegames.com
1999-05-20 20:20:24 +00:00
Brian Somers
4c32f5d217 Remove all diagnostics to stdout/stderr with #ifdef DEBUG
Statify functions in alias_nbt.c
1999-03-09 23:44:00 +00:00
Brian Somers
164928d385 Document PacketAliasPptp() and allow it to be disabled
by passing INADDR_NONE.
1999-03-07 18:13:23 +00:00
Brian Somers
7d96f4efd2 Version 3.0: January 1, 1999
- Transparent proxying support added.
    - PPTP redirecting support added based on patches
      contributed by Dru Nelson <dnelson@redwoodsoft.com>.

Submitted by: Charles Mott <cmott@srv.net>
1999-02-27 02:16:01 +00:00
Brian Somers
a2743da670 If we can't open alias.log, don't try to write to the
resulting NULL FILE *.
PR:	9403
1999-01-10 02:05:13 +00:00
Brian Somers
9feab75ab7 o Support a compile-time -DNO_FW_PUNCH for portability
(and those of us that don't want the functionality).
o Don't assume sizeof(long) == 4.
Ok'd by: Charles Mott <cmott@srv.net>
1998-04-19 21:42:07 +00:00
Brian Somers
0ffaca1078 1) in CleanupAliasData, don't nullify entry in linkTableOut
since there might be permanent entries still left after
   calls to DeleteLink (it will be nullified by DeleteLink
   if all entries are deleted, won't it ?)

2) in PacketAliasSetAddress, set the aliasing address
   even when PKT_ALIAS_RESET_ON_ADDR_CHANGE is in effect.
   Just don't clean up links in this case.

Submitted by: Ari Suutari <ari@suutari.iki.fi>
         via: Charles Mott <cmott@srv.net>
PR: 5041
1998-02-27 23:07:07 +00:00
Eivind Eklund
58ba5f4a30 Remove use of <osreldate.h>.
Screwed up by: myself
1998-01-11 18:34:38 +00:00
Alexander Langer
1e73fe2ae8 Sync with ipfw interface change: fw_pts is now part of a union (a
necessary evil due to the 108 byte setsockopt() limit).
1998-01-10 16:14:18 +00:00
Jordan K. Hubbard
20f16cfce3 include <net/if.h> and restore this to sanity. 1998-01-10 15:04:06 +00:00
Eivind Eklund
8ddc51bc8b Teach libalias to work with IPFW firewalls (controlled by a flag).
Obtained from: Yes development tree (+ 10 lines of patches from
	Charles Mott, original libalias author)
1998-01-09 21:13:35 +00:00
Brian Somers
4fe071a9f7 Fix file descriptor leak.
Submitted by:	Charles Mott <cmott@srv.net>
Identified by:	Gordon Burditt
1997-08-11 22:05:10 +00:00
Brian Somers
3efa11bb71 Update to version 2.2. Only the PacketAlias*()
functions should now be used.  The old 2.1 stuff is
there for backwards compatability.
Submitted by:	Charles Mott <cmott@snake.srv.net>
1997-08-03 18:20:03 +00:00
Brian Somers
3b160b8b6e Create the alias library. This is currently only used by
ppp (or will be shortly).  Natd can now be updated to use
this library rather than carrying its own version of the code.

Submitted by:	Charles Mott <cmott@srv.net>
1997-05-23 04:41:31 +00:00