MFC r329105: ppp(8): fix code producing debugging logs

ppp(8): fix code producing debugging logs

Fix several cases when long buffer is copied to shorter one
using snprintf that results in contents truncation and
clobbering unsaved errno value and creation of misleading logs.

PR: 218517
Approved by: mav (mentor)

MFC r326276:

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Fix a ton of speelling errors

arc lint is helpful

Reviewed By: allanjude, wblock, #manpages, chris@bsdjunk.com
Differential Revision: https://reviews.freebsd.org/D3337

Build with -DNOINET6...

Fix the build on 64-bit platforms.

Make ppp WARNS=5 clean

Make getprotobynumber() calls in FilterCheck conditional on the log
levels by which they are used. On a typical production setting (no
debug or filter logging) this will save an open/read/close system
call sequence per packet, approximately halving the system overhead
and reducing the overall overhead by 38%.

dd bs=1k count=512 if=/usr/share/dict/web2 |
ssh ppp-linked-host dd of=/dev/null

# time original-ppp -nat -foreground connection
Working in foreground mode
Using interface: tun0
2.822u 2.404s 2:00.31 4.3% 392+496k 8+18io 3pf+0w

# time new-ppp -nat -foreground connection
Working in foreground mode
Using interface: tun0
2.082u 1.173s 1:26.06 3.7% 379+450k 0+18io 0pf+0w

MFC after: 3 weeks

Passing a u_char to ntohs() is guaranteed to give the wrong answer !

Submitted by: Francis Dupont <Francis.Dupont@enst-bretagne.fr>

Remove whitespace at the end of lines.

o Clean up some #includes
o Bump version number to 3.0.4
o When talking to a RADIUS server, provide a NAS-Port-Type.

When the NAS-Port-Type is Ethernet, provide a NAS-Port value equal
to the SESSIONID from the environment in direct mode or the
NGM_PPPOE_SESSIONID message in other modes. If no SESSIONID is found,
default to the interface index in client mode or zero in server mode.

When the NAS-Port-Type is ISDN, set the NAS-Port to the minor number
of the physical device (ie, the N in /dev/i4brbchN).

This makes it easier for the RADIUS server to identify the client
WRT accounting data etc.

Prompted by: lsz8425 <lsz8425@mail.cd.hn.cn>

Back out the previous fix to deal with kernels that don't support IPv6,
and implement a far more subtle and correct fix.

The reason behind the infinite loop was that ppp was trying to make up
initial IPv6 numbers and wasn't giving up when it failed unexpectedly to
assign the addresses it just fabricated to it's interface (thinking that
the reason was because another interface was using the same address).
It now attempts this up to 100 times before just failing and trying to
muddle along (in reality, this should never happen more than a couple
of times unless our random number generator doesn't work).

Also, when IPv6 is not available, don't even try to assign the IPv6
interface address in the first place...

Run correctly on a machine built without AF_INET6 support

Fix a couple of forgotten comments

o Add ipv6 support, abstracting most NCP addresses into opaque
structures (well, they're treated as opaque).

It's now possible to manage IPv6 interface addresses and routing
table entries and to filter IPV6 traffic whether encapsulated or
not.

IPV6CP support is crude for now, and hasn't been tested against
any other implementations.

RADIUS and IPv6 are independent of eachother for now.

ppp.linkup/ppp.linkdown aren't currently used by IPV6CP

o Understand all protocols(5) in filter rules rather than only a select
few.

o Allow a mask specification for the ``delete'' command. It's now
possible to specifically delete one of two conflicting routes.

o When creating and deleting proxy arp entries, do it for all IPv4
interface addresses rather than doing it just for the ``current''
peer address.

o When iface-alias isn't in effect, don't blow away manually (via ``iface
add'') added interface addresses.

o When listening on a tcp server (diagnostic) socket, bind so that a
tcp46 socket is created -- allowing both IPv4 and IPv6 connections.

o When displaying ICMP traffic, don't display the icmp type twice.
When display traffic, display at least some information about unrecognised
traffic.

o Bump version

Inspired after filtering work by: Makoto MATSUSHITA <matusita@jp.FreeBSD.org>

Add support for stateful MPPE (microsoft encryption) providing
encryption compatibility with Windows 2000. Stateful encryption
uses less CPU but is bad on lossy transports.

The ``set mppe'' command has been expanded. If it's used with any
arguments, ppp will insist on encryption, closing LCP if the other
end refuses.

Unfortunately, Microsoft have abused the CCP reset request so that
receiving a reset request does not result in a reset ack when using
MPPE...

Sponsored by: Monzoon Networks AG and FreeBSD Services Limited

Convert IIJ copyrights to BSD copyrights.

Approved by: Toshiharu OHNO <tohno@sirius.ocn.ne.jp>

Fix an alignment error

PR: 27766
Submitted by: Sudish Joseph <sudish@mindspring.com>
MFC after: 2 weeks

Handle IP over IP (IPPROTO_IPV4) properly.

We now unwrap IP/IP and apply filter rules to both the outer
layer (with ``set filter blah x.x.x.x y.y.y.y ipip'') and to
the payload (reinterpreted by the filter rules).

``set log tcp/ip'' will now show both the outer wrapper and
the (reinterpreted) payload contents.

MAXHOSTNAME includes space for a NUL

MAXPATHLEN -> PATH_MAX
Don't assume MAXHOSTNAMELEN includes the NUL
Correct a diagnostic
Use "localhost" in our prompt instead of ""

Fix some log_Printf() casting

Obtained from: NetBSD (pkgsrc)

Understand IPPROTO_ESP and IPPROTO_AH packets

Submitted by: Angelos D. Keromytis <angelos@dsl.cis.upenn.edu>

Add LogFILTER logging to log packets allowed by the dial filter and
dropped by any filter.

Submitted by: Mark Hannon <markhannon@one.net.au>

with some small tweaks by me.

Allow a ``timeout secs'' filter option to let specific packet types
effect the idle timer in different ways.

Submitted by: Stefan Esser <se@freebsd.org>

With adjustments by me to document the option in the man page and to
give the same semantics for outgoing traffic as incoming.

I made the style more consistent in ip.c - this should really have
been done as a separate commit.

o Log the (payload/size) of all packet types, not just TCP packets

o If the new ``filter-decapsulation'' is enabled, delve into UDP packets
that contain 0xff 0x03 as the first two bytes, and if we recognise it
as PROTO_IP, decapsulate it for the purpose of filter checking.

If we recognise it as PROTO_<anything else> mention this for logging
purposes only.

This change is aimed at people running PPPoUDP where the UDP traffic is
being sent over another PPP link. It's desireable to have the top level
link connected all the time, but to have the bottom level link capable
of decapsulating the traffic and comparing the payload against the filters,
thus allowing ``set filter dial ...'' to work in tunnelled environments.

The caveat here is that the top ppp cannot employ any compression layers
without making the data unreadable for the bottom ppp. ``disable deflate
pred1 vj'' and ``deny deflate pred1 vj'' is suggested.

Allow ``set urgent none'' to disable all urgent ports and IPTOS_LOWDELAY
prioritisation.

Requested by: luigi

Log information about packets being dropped (probably due to
``nat deny_incoming yes'') by libalias.

When ppp can't identify the relevant name, don't use "???", use
<nnn> or <0xxxx> instead.

Add ``set log dns'' to log DNS QUERY packets.

This is invaluable for dial-on-demand connections...
In ppp.linkup:

set log -dns -tcp/ip

and in ppp.linkdown

set log +dns +tcp/ip

giving a much better account of why the link came up.

Handle the availability of TUNSIFHEAD. If it's there, use it.

For the moment this is just overhead, but it'll be used for INET6
support later.

Add a bunch of `const's and fix a typo.

Submitted by: Rich Neswold <rneswold@MCS.Net>

Cosmetic: Make struct mbuf more like kernel mbufs.

Support GRE packets

Submitted by: Harry Starr <starr@gccs.com.au>

Back out the bogus #ifdef __NetBSD__ #include <signal.h> lines.
The original report was due to a mis-installation of the NetBS
header files :-/

Submitted by: Kazuyoshi Kato <kazk@yyy.or.jp>

NetBSD has moved ``extern int errno;'' to signal.h :-/

Submitted by: Kazuyoshi Kato <kazk@yyy.or.jp>

Correct the return from FilterCheck for fragments

PR: 13771
Submitted by: Dean M. Phillips <dphill@inav.net>

Introduce a forth IP packet queue. Urgent packets with
ip_tos == IPTOS_LOWDELAY now get precidence over urgent
packets with ip_tos != IPTOS_LOWDELAY and non-urgent packets
with ip_tos == IPTOS_LOWDELAY.

Enhance the ``set urgent'' syntax to allow for urgent UDP
packets as well as urgent TCP packets.

o Split the two IPCP queues into three - one for FSM data
(LCP/CCP/IPCP), one for urgent IP traffic and one for
everything else.
o Add the ``set urgent'' command for adjusting the list of
urgent port numbers. The default urgent ports are 21, 22,
23, 513, 514, 543 and 544 (Ports 80 and 81 have been
removed from the default priority list).
o Increase the buffered packet threshold from 20 to 30.
o Report the number of packets in the IP output queue and the
list of urgent ports under ``show ipcp''.

$Id$ -> $FreeBSD$

Add ISDN support via isdnd & i4b. This requires version
0.81.1 of the i4b code - namely support of the I4B_VR_REQ
ioctl via the i4brbchX device.

Ppp controls the phone number, but idle timers and
SYNC/RAW decisions are still made by isdnd (in isdnd.rc).

This involves a new datalink state machine phase. The
``wait for carrier'' phase happens after dialing but
before logging in. The whole dial state should really
be abstracted so that each device type can deal with it
in its own way (thinking about PPPoE) - but that'll have
to wait.

The ``set cd'' symantics remain the same for tty devices,
but we now delay until we either get CD or timeout waiting
(at which time we drop the link if we require CD).

For i4b devices we always insist on carrier.

Thanks to hm@ for his help, and especially for pointing out
that I *don't* need to re-implement isdnd (that was a huge
waste of time !) :-]

#ifdef IPPROTO_OSPFIGP before expecting it to be defined.
This unbreaks OpenBSD.

Filter ospf and igmp separately.

Kind-of submitted by: phk

o Overhaul filtering, adding facilities to jump over rules and to
negate the sense of rules.
o Remove the redundant (and undocumented) ``host'' and ``port''
words (README.changes updated).
o Don't permit (and ignore) garbage instead of the protocol.

Mostly submitted by: Peter Jeremy <jeremyp@gsmx07.alcatel.com.au>

Support `igmp' filters.
Mostly submitted by: Timo Geusch <freebsd@sleepycat.ukpeople.net>

o Alter the mbuf type as it's processed by different layers.
o Show more information about missing MP fragments in ``show mp''.
o Do away with mbuf_Log(). It was showing mbuf stats twice on
receipt of LCP/CCP/IPCP packets.... ???!!?
o Pre-allocate a bit extra when creating LQR packets to avoid having
to allocate another mbuf in mbuf_Prepend().

Remember if MYADDR or HISADDR is used in a filter add tweak all
filters any time either value changes.

Ensure that we're not going to overflow our ``struct tun''
when we mbuf_Read() into it.
Add the link name to a few diagnostics.

Deal with the fact that as we now mbuf_Read the fsm
header in fsm_Input() we often end up with a NULL mbuf.

Deal with a possible NULL mbuf being passed into
mbuf_Prepend().

Adjust some spacing to make things more consistent.

o Redesign the layering mechanism and make the aliasing code part of
the layering.

We now ``stack'' layers as soon as we open the device (when we figure
out what we're dealing with). A static set of `dispatch' routines are
also declared for dealing with incoming packets after they've been
`pulled' up through the stacked layers.

Physical devices are now assigned handlers based on the device type
when they're opened. For the moment there are three device types;
ttys, execs and tcps.

o Increment version number to 2.2
o Make an entry in [uw]tmp for non-tty -direct invocations (after
pap/chap authentication).
o Make throughput counters quad_t's
o Account for the absolute number of mbuf malloc()s and free()s in
``show mem''.
o ``show modem'' becomes ``show physical''.

Make ports 80 & 81 ``interactive''.

Add support for NetBSD

Ensure that the thing we're casting to struct ip
is aligned for non-i386 architectures.

Initial RADIUS support (using libradius). See the man page for
details. Compiling with -DNORADIUS (the default for `release')
removes support.

TODO: The functionality in libradius::rad_send_request() needs
to be supplied as a set of routines so that ppp doesn't
have to wait indefinitely for the radius server(s). Instead,
we need to get a descriptor back, select() on the descriptor,
and ask libradius to service it when necessary.
For now, ppp blocks SIGALRM while in rad_send_request(), so
it misses PAP/CHAP retries & timeouts if they occur.

Only PAP is functional. When CHAP is attempted, libradius
complains that no User-Password has been specified... rfc2138
says that it *mustn't* be used for CHAP :-(

Sponsored by: Internet Business Solutions Ltd., Switzerland

Don't forget to initialise dbuff when debugging.

Sync with OpenBSD ifdefs

Put the IP buffer queues into struct ipcp.
Forgotten by: me

If we've got a full output buffer queue and cannot send
anything for two mintues (see ``set choked'' and ``show
bundle''), nuke the ip, mp and link level buffer queues.

This should fix problems where ``ppp -auto'' seems to stop
responding after failing to connect to the peer a few times.

o Support callback types NONE, E.164, AUTH and CBCP.
(see the new ``set callback'' and ``set cbcp'' commands)
o Add a ``cbcp'' log level and mbuf type.
o Don't dump core when \T is given in ``set login'' or
``set hangup''.
o Allow ``*'' and blanks as placeholders in ppp.secret and
allow a fifth field for specifying auth/cbcp dialback
parameters.
o Remove a few extraneous #includes
o Define the default number of REQs (restart counter) in defs.h
rather than hardcoding ``5'' all over the place.
o Fix a few man page inconsistencies.

Check the ``alive'' filter for a packet *before* the
mbuf is deallocated by vj_SendFrame().

o Fix remaining sizeof problems for 64 bit machines.
o Allow ``set ....'' when we have multiple links but aren't in
multilink mode.
o Do a TLS when we receive a ``Open'' event in ``Closed'' state,
despite the rfc state transition table. This is clearly an
error in the RFC as TLS cannot have yet been called (without
TLF) in the ``Closed'' state.
I've posted a message to comp.protocols.ppp for confirmation.

Remove redundant includes

Don't dlopen()/dlsym() libalias, use it in the same way
as the rest of the world uses libraries.

``struct tunnel_header'' -> u_int32_t in OpenBSD.
struct tunnel_header is going soon.

Suggested by: Theo

Change some log levels. ALERTs are only logged when
something that can't happen happens or when everyone
needs to know. ERRORs are only logged when something
unexpected happens.

o De-staticise things that don't need to be static.
o Bring the static ``ttystate'' into struct prompt so that
the tilde context is per prompt and not global.
o Comment the remaining static variables so that it's
clear why they're static.
o Add some XXX comments suggesting that our interface list
and our hostname should be re-generated after a signal
(say SIGUSR1) so that a machine with PCCARDs has a chance.

Deal with PROTO_IGMP and PROTO_IPIP packets correctly.

Submitted by: Mark Tinguely <tinguely@plains.NoDak.edu>
This change will allow a PPP host enabled with the "-alias" option to
run mrouted. This does not intend to forward the IGMP nor tunneled packets
to another host on the far side if the tun0 interface.

MFMP: Make ppp multilink capable.
See the file README.changes, and re-read the man page.

Quieten gcc-2.8.1

Add extraneous braces to stiffle warnings from gcc-2.8

Remove unused #includes.
Make various bits static.
Remove unused variables.
Submitted by: eivind

Lose <net/if_var.h> !
This'll require a `make installworld'.

Don't scribble on the stack if our input packet is
bigger than our MRU. Moan and drop the packet
instead.

Show how much time is left before timing out in the
`show timeout' output.
Remove ipIdleSecs variable - it's not used.

If a packet causes a dial, continue to test whether it's
blocked in the output filter. If so, proceed with the
dial despite dropping the packet.

Cosmetic (style):
sizeof(var) -> sizeof var
sizeof type -> sizeof(type)

Suggested by: J Wunsch <j@uriah.heep.sax.de>

Fix prototypes.
Remove extraneous decls.
Add ``const'' to several places.
Allow ``make NOALIAS=1'' to remove IP aliasing.
Merge with OpenBSD - only the Makefiles vary.

We can now survive a compile with
-Wall -Wbad-function-cast -Wcast-align -Wcast-qual
-Winline -Wmissing-declarations -Wmissing-prototypes
-Wnested-externs -Wpointer-arith -Wredundant-decls
-Wshadow -Wstrict-prototypes -Wwrite-strings -Wchar-subscripts
(although the Makefile just contains -Wall).

Add throughput logging (disabled by default).
Use "enable throughput" to see modem & IPCP throughput.
Removed an extraneous prompt()

Abstract data read from and written to the tun device,
allowing for a possible header on the front of all packets.
In OpenBSD, there's a structure containing the address
family here.
If we're building under OpenBSD, set up the ``flags'' part
of struct tuninfo (not there under FreeBSD) so that we config
the interface as POINTOPOINT.
Prefix prototypes with ``extern'' in os.c for consistency.

These changes are cosmetic under FreeBSD, but allow ppp to
build & work under OpenBSD (bar the srandomdev() stuff,
the inclusing of <net/if_var.h> and some Makefile symantecs).

Understand networks in the filter rules. We don't
insist on x.x.x.0/24 - x.x.x.x/24 is ok too.

Log whether or not IP packets are bloked due to
a filter.

Cosmetic:
Move prototypes into the correct headers.

Cosmetic (no functional changes):
o Add missing $Id$s
o Move extern decls from .c -> .h files
o Staticize
o Remove #includes from .h files
o style(9)ify includes
o bcopy -> memcpy
bzero -> memset
bcmp -> memcmp
index -> strchr
rindex -> strrchr
o Move timeout.h -> timer.h (making it consistent w/ timer.c)
o Add -Wmissing-prototypes

Cosmetic: Log a strerror(errno) when failing to write to
the tun device.

Allow the transition from an idle timeout value
of zero (no timeout) while IPCP is up.
Move some prototypes into .h files and re-order
some includes.

Make the code format more in line with style(9).
Update loadalias to use the new libalias api.
Update to version 1.1.

Put TCP/IP logs back on one line.

Overhaul ppp:
o Use syslog
o Remove references to stdout/stderr (incl perror())
o Introduce VarTerm - the interactive terminal or zero
o Allow "set timeout" to affect current session
o Change "set debug" to "set log"
o Allow "set log [+|-]flag"
o Make MSEXT and PASSWDAUTH stuff the default
o Move all #ifdef DEBUG stuff into the code - this
shouldn't be too much overhead. It's now controlled
with "set log +debug"
o Add "set log command, debug, tun, warn, error, alert"
o Remove cdefs.h, and assume an ansi compiler.
o Improve all diagnostic output
o Don't trap SIGSEGV
o SIGHUP now terminates again (log files are controlled
by syslog)
o Call CloseModem() when changing devices
o Fix parsing of third arg of "delete"

I think this fixes the "magic is same" problems that some
people have been experiencing.
The man page is being rewritten. It'll follow soon.

De-couple ppp from libalias. If libalias isn't there, the
alias commands simply won't work. Only root may specify the
location of the alias lib (otherwise, it's hard-coded).

Make logprintf silently fail if LogOpen hasn't been called.

Suggested by: eivind

Fix the reconnect option, and add an explanation to vars.h

Use the latest alias engine - now in libalias.

Submitted by: Charles Mott <cmott@srv.net>

Mega update to sort out bad implementations
of reconnect & -background.

o Fix reconnect anomolies.
o Make reconnect apply to failed LQR hangups (& mention in man page).
o Make reconnect effective in -background mode.
o Listen on socket in -background mode.
o Try all phone numbers in -background mode.
o Insist on system arg in -background mode.
o Make a control-connection close command exit in -background mode.
o Output status message to stdout on exit of parent in -background mode.
o Don't notify parent of success too soon.
o Describe termination EX_* code.
o Miscelaneous diagnostic corrections.
o Remove redundant connect_time from modem.c.
o Don't repeatedly DownConnection().

Tidy up the code - bounds checking, return
value checking etc.

Submitted by: eivind

Add a reconnect capability directing ppp to re-establish
the connection after an unexpected loss of carrier:

set reconnect timer ntries

The man page warns against using this command when your
timeout value is slightly more than the other sides :{}

Suggested by: burton@bsampley.vip.best.com (Burton Sampley)

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Fixed prototypes of PacketAliasIn/Out. (cosmetic)

Submitted by: Brian Somers <brian@awfulhak.demon.co.uk>

The infamous IP aliasing code for ppp, modified to work as a runtime option
(otherwise ppp's behavior remains unchanged) and documented by myself,
Steve Sims, Nate Williams, Martin Renters and god-only-knows who else. :-)
Submitted by: nate
Obtained from: Charles Mott <cmott@srv.net>

Added my 'ddial' patches to user-PPP. The new mode tries it's darndest
to keep the link up, so it re-dials whenever it detects the link go
down. This is useful for 'dedicated' links who use PPP.

It's been used for over a year w/out problems at different sites.

Here is a diff of /usr/src/usr.sbin/ppp against current. The diffs
add some logging functionality which I find very useful.
'set debug link' will record just link up/down and address assignments.
'set debug connect' will record the entire chat dialog
'set debug carrier' will record just chat lines including 'CARRIER'
(so that I can be sure I'm getting a 28.8 line).

There was a global change required to permit LogPrintf to take a bit
mask instead of a bit position value (to permit logging some events
on either of two flags, so that no change in 'set debug lcp' would
result from the code supporting 'link'. Thus the diffs are rather
long for such a small change. The man page is also touched.

Oh, and there was a slight syntax problem in route.c

Reviewed by: phk
Submitted by: Tony Kimball <alk@Think.COM>

Some patches to ppp which improve stability. I have been running a
ppp based on these patches for about 3 weeks with no downtime.

The original submitters comments:

Two features iijppp has over kernel ppp that I like are predictor1
compression and demand dialing. Here are a few bug fixes.

I expanded the priority queueing scheme and discovered it was broken
due to the assignment at ip.c line 300. All packets were being
queued at the same priority.

Fixing priority queueing broke predictor1 compression. Packets
were compressed before being queued and predictor1 worked as long
as the packets were popped off the queue in the same order they
were pushed onto the queue.

There were a few byte order problems in IP header tests also.

There is a recursion problem in SendLqrReport(). LcpClose() is
called when "Too many echo packets are lost" which winds up in
SendLqrReport() again. I believe the original intention was to
just stop the LQR timer with the call to StopLqr() but the side
effects hurt.

Submitted by: John Capo <jc@irbs.com>

Final cleanup for now. -Wall is now silent. A couple of bogons found.

A random bunch of cleanup changes.

1. All fragments (except the first one) of a fragmented packet were
dropped - devet@adv.IAEhv.nl (Arjan de Vet)
2. Will not read data from telnet connection - John Capo <jc@irbs.com>
3. Using LQM option could be drop the link due to LcpLayerDown() doesn't
stop LQR timer. - Brian <brian@awfulhak.demon.co.uk>
4. Allow to describe a syntax of filters that is not only port number
but also by name in /etc/service. - Rich Murphey <rich@lamprey.utmb.edu>

Reviewed by: Atsushi Murai <amurai@spec.co.jp>
Submitted by: devet@adv.IAEhv.nl, jc@irbs.com, brian@awfulhak.demon.co.uk,
rich@lamprey.utmb.edu

Remove trailing whitespace.

1.Reducing cpu usage at off connection.
2.Implment Redail function as working correctly.
3.Clean up a code as I notice.
4.Now, RTT getting close to 50ms with ISDN/TA 38400bps !!

Reviewed by: amurai@spec.co.jp
Submitted by: amurai@spec.co.jp

New user Process PPP based on iij-ppp0.94beta2.

o Supporting SYNC SIO device (But need a device driver)
- add "set speed sync"
o Fixing bug for Predictor-1 function.
o Add new parameter that re-sent interval for set timeout commands.
o Improving RTT (Round Trip Time) and reducing processor time.
- Previous Timer service was using polling, and now using
SIGALRM ;-)
- A 0.94beta2 will not work correctly....

-- Follows are additinal feature not including 0.94beta2
o Support Proxy ARP
- add "enable/disable proxy" commands
o Marging common routine in CHAP/PAP.
o Enhancing LCP/IPCP log information.
o Support local Authfication connection on port 300x and tty.
- You can set up pair of your "hostname -s" and
password in ppp.secret. if either ppp.secret file nor
your hostname line don't exist, It will notify a message
and working as same as previous version.(Backword compatibility)
- If you did set up them, It's allow connection but nothing to do
except help and passwd command.
- add "passwd yourpasswd" commands
o Support afilter - keep Alive filter that a packet can send/receiving
according to ifilter/ofilter but doesn't count it as preventing idle
timer expires.
- Same syntax of other filters.
o Fixing bugs reported by current user for previous one. Thanks !!

Reviewed by: Atsushi Murai (amurai@spec.co.jp)

This commit was generated by cvs2svn to compensate for changes in r6059,
which included commits to RCS files with non-trunk default branches.