| Commit message (Collapse) | Author | Age | Files | Lines |
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Approved by: Charles Mott <cmott@scientech.com>
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Approved by: Atsushi Murai <amurai@spec.co.jp>
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For FTP control connection, keep the CRLF end-of-line termination
status in there.
Fixed the bug when the first FTP command in a session was ignored.
PR: 24048
MFC after: 1 week
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Reviewed by (*): bde
(*) alias_local.h only got a cursory glance.
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whether they should create a link if lookup has failed or not.
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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>
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This fixes a null pointer dereference problem that is unlikely to
happen in normal circumstances.
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The field is in network byte order and contains the
size of the header.
Reviewed by: brian
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datagram embedded into ICMP error message, not with protocol
field of ICMP message itself (which is always IPPROTO_ICMP).
Pointed by: Erik Salander <erik@whistle.com>
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not alias `ip_src' unless it comes from the host an original
datagram that triggered this error message was destined for.
PR: 20712
Reviewed by: brian, Charles Mott <cmott@scientech.com>
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This makes outgoing ICMP echo/timestamp replies to be de-aliased
with the right source IP, not exactly the primary aliasing IP.
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add unsigned char cast to ctype macro
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Reported by: Christian Schade <chris@cube.sax.de>
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PPTP control messages.
- Cosmetics: replace `GRE link' with `PPTP link'.
Reviewed by: Erik Salander <erik@whistle.com>
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Submitted by: Erik Salander <erik@whistle.com>
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Fix an overlong line and trailing whitespace that crept in, in the
previous commit.
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Quicktime streaming media applications.
Add a BUGS section to the man page.
Submitted by: Erik Salander <erik@whistle.com>
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- ipfw always rejected rule with `neither in nor out' diagnostics.
- number of src/dst ports was not set properly.
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- SHLIB_MAJOR++.
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- 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>
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- Stricter checking of PORT/EPRT/227/229 messages format.
- Moved all security checks into one place.
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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
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that they (once again) go to the target machine rather than
the alias address.
PR: 18354
Submitted by: ru
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to PPTP) with more generic PacketAliasRedirectProto().
Major number is not bumped because it is believed that noone
has started using PacketAliasRedirectPptp() yet.
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LSNAT links are first created by either PacketAliasRedirectPort() or
PacketAliasRedirectAddress() and then set up by one or more calls to
PacketAliasAddServer().
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- new API function: PacketAliasRedirectPptp()
- new mode bit: PKT_ALIAS_DENY_PPTP
Please see manual page for details.
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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
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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
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- Minor optimizations.
- Minor spelling fixes.
PR: 14305
Submitted by: ume
Rewritten by: ru
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- Minor spelling fixes.
- Make IcmpAliasOut2() really work.
Before this change:
# natd -v -n PUB_IFACE -p 12345 -redirect_address 192.168.1.1 P.P.P.P
natd[87923]: Aliasing to A.A.A.A, mtu 1500 bytes
In [UDP] [UDP] X.X.X.X:49562 -> P.P.P.P:50000 aliased to
[UDP] X.X.X.X:49562 -> 192.168.1.1:50000
Out [ICMP] [ICMP] 192.168.1.1 -> X.X.X.X 3(3) aliased to
[ICMP] A.A.A.A -> X.X.X.X 3(3)
# tcpdump -n -t -i PUB_IFACE host X.X.X.X and "(udp or icmp)"
tcpdump: listening on PUB_IFACE
X.X.X.X.49562 > P.P.P.P.50000: udp 3
A.A.A.A > X.X.X.X: icmp: A.A.A.A udp port 50000 unreachable
After this change:
# natd -v -n PUB_IFACE -p 12345 -redirect_address 192.168.1.1 P.P.P.P
natd[89360]: Aliasing to A.A.A.A, mtu 1500 bytes
In [UDP] [UDP] X.X.X.X:49563 -> P.P.P.P:50000 aliased to
[UDP] X.X.X.X:49563 -> 192.168.1.1:50000
Out [ICMP] [ICMP] 192.168.1.1 -> X.X.X.X 3(3) aliased to
[ICMP] P.P.P.P -> X.X.X.X 3(3)
# tcpdump -n -t -i PUB_IFACE host X.X.X.X and "(udp or icmp)"
tcpdump: listening on PUB_IFACE
X.X.X.X.49563 > P.P.P.P.50000: udp 3
P.P.P.P > X.X.X.X: icmp: P.P.P.P udp port 50000 unreachable
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- Minor spelling fixes.
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Requested by: Charles Mott <cmott@scientech.com>
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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.
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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.
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NO_FW_PUNCH isn't defined.
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of the typeset output, tend to make diffs harder to read and provide
bad examples for new-comers to mdoc.
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+it does, amongst other things, clear out any
The old sentance didn't seem to make sense.
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