NetBSD Problem Report #56129
From tsutsui@ceres.dti.ne.jp Sun Apr 25 15:01:11 2021
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by mollari.NetBSD.org (Postfix) with ESMTPS id 87C351A9269
for <gnats-bugs@gnats.NetBSD.org>; Sun, 25 Apr 2021 15:01:11 +0000 (UTC)
Message-Id: <202104251501.13PF126r023291@ceres.dti.ne.jp>
Date: Mon, 26 Apr 2021 00:01:02 +0900 (JST)
From: Izumi Tsutsui <tsutsui@ceres.dti.ne.jp>
Reply-To: tsutsui@ceres.dti.ne.jp
To: gnats-bugs@NetBSD.org
Cc: tsutsui@ceres.dti.ne.jp
Subject: ftp(1) should keep control session during large xfer
X-Send-Pr-Version: 3.95
>Number: 56129
>Category: bin
>Synopsis: ftp(1) should keep control session during large xfer
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: lukem
>State: closed
>Class: change-request
>Submitter-Id: net
>Arrival-Date: Sun Apr 25 15:05:00 +0000 2021
>Closed-Date: Sat Aug 13 22:30:10 +0000 2022
>Last-Modified: Tue Nov 07 23:50:01 +0000 2023
>Originator: Izumi Tsutsui
>Release: NetBSD 9.1
>Organization:
>Environment:
System: NetBSD mirage 9.1 NetBSD 9.1 (GENERIC) #0: Sun Oct 18 19:24:30 UTC 2020 mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
>Description:
During ftp installation using miniroot on slow hp300 and sun3 etc.,
the install script in miniroot use ftp(1) to get binary sets.
However it takes more than 5 minites (300 seconds) to get large sets
like base.tgz and comp.tgz etc., then ftp(1) command complains
---
250 CWD command successful.
local: INSTALL/base.tgz remote: base.tgz
227 Entering Passive Mode (199,233,217,201,203,31)
100% |************************************| 40035KiB 104.99 KiB/s 00:00 ETA
421 Service not available, remote server timed out. Connection closed.
40995866 bytes received in 07:21 (90.60 KiB/s)
ftp: No control connection for command
Extracting base.tgz:
---
I've fixed miniroot script to use auto-fetching with URL per each set
https://mail-index.netbsd.org/source-changes/2020/12/12/msg125060.html
http://cvsweb.netbsd.org/cgi-bin/cvsweb.cgi/src/distrib/miniroot/install.sub.diff?r1=1.58&r2=1.59
so installation now works, but ftp(1) command still comlains as above.
Several ftp clients keep control sessions by sending NOOP or PWD etc.
during large tranfers, so it's worth to add similar mechanism to
NetBSD's ftp(1).
>How-To-Repeat:
See above.
Or downloader comp.tgz on slow machines or via poor network.
>Fix:
N/A
>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: bin-bug-people->lukem
Responsible-Changed-By: lukem@NetBSD.org
Responsible-Changed-When: Wed, 02 Jun 2021 14:39:55 +0000
Responsible-Changed-Why:
I'll take it
State-Changed-From-To: open->feedback
State-Changed-By: lukem@NetBSD.org
State-Changed-When: Thu, 03 Jun 2021 10:12:17 +0000
State-Changed-Why:
I've changed ftp.c rev 1.172 to set SO_KEEPALIVE on the control connection.
This was a much simpler change than refactoring to execute "STAT" at intervals
during a transfer, and also mirrors existing behaviour in ftpd.
Does this fix the problem?
From: "Luke Mewburn" <lukem@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc:
Subject: PR/56129 CVS commit: src/usr.bin/ftp
Date: Thu, 3 Jun 2021 10:11:00 +0000
Module Name: src
Committed By: lukem
Date: Thu Jun 3 10:11:00 UTC 2021
Modified Files:
src/usr.bin/ftp: ftp.c
Log Message:
set SO_KEEPALIVE on control connection
Attempt to prevent timeouts of the control connection by setting SO_KEEPALIVE.
This matches the equivalent behaviour in ftpd.
Note: This is a much simpler change than adding a background polling event
to invoke "STAT" (or "NOOP") on the control connection during a transfer.
(It's unclear from RFC 959 whether "NOOP" is even permitted during a transfer).
PR bin/56129
To generate a diff of this commit:
cvs rdiff -u -r1.171 -r1.172 src/usr.bin/ftp/ftp.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
From: "Luke Mewburn" <lukem@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc:
Subject: PR/56129 CVS commit: src/usr.bin/ftp
Date: Thu, 3 Jun 2021 10:23:33 +0000
Module Name: src
Committed By: lukem
Date: Thu Jun 3 10:23:33 UTC 2021
Modified Files:
src/usr.bin/ftp: Makefile ssl.c ssl.h version.h
Log Message:
use fetch_*() for I/O with SMALLPROG / !WITH_SSL builds
Adapt the SMALLPROG / -UWITH_SSL build to also use the fetch_*()
methods from ssl.c, instead of using stdio, as stdio isn't robust
when using interruptable signals.
Disable ssl-specific support in the fetch_*() methods if WITH_SSL
isn't defined, so SMALLPROG still doesn't have ssl support (as expected).
The resulting SMALLPROG binary is slightly larger than before
(e.g., 157KiB vs 153KiB on amd64).
Set version to 20210603 for this fix and the SO_KEEPALIVE fix for PR 56129.
PR install/56219
To generate a diff of this commit:
cvs rdiff -u -r1.38 -r1.39 src/usr.bin/ftp/Makefile
cvs rdiff -u -r1.9 -r1.10 src/usr.bin/ftp/ssl.c
cvs rdiff -u -r1.4 -r1.5 src/usr.bin/ftp/ssl.h
cvs rdiff -u -r1.92 -r1.93 src/usr.bin/ftp/version.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
From: Izumi Tsutsui <tsutsui@ceres.dti.ne.jp>
To: gnats-bugs@netbsd.org
Cc: lukem@netbsd.org, tsutsui@ceres.dti.ne.jp
Subject: Re: bin/56129 (ftp(1) should keep control session during large xfer)
Date: Sun, 13 Jun 2021 04:21:09 +0900
> State-Changed-Why:
> I've changed ftp.c rev 1.172 to set SO_KEEPALIVE on the control connection.
> This was a much simpler change than refactoring to execute "STAT" at intervals
> during a transfer, and also mirrors existing behaviour in ftpd.
>
> Does this fix the problem?
I've patched usr.bin/ftp in netbsd-9-2-RELEASE to 20210603 and
built NetBSD/x68k 9.2 INSTALL kernel, but ftp(1) still failed
to fetch base.tgz due to "No control connection for command."
https://pbs.twimg.com/media/E3tCjW2VgAMfjhQ.jpg
---
Izumi Tsutsui
State-Changed-From-To: feedback->open
State-Changed-By: lukem@NetBSD.org
State-Changed-When: Sat, 12 Jun 2021 22:41:33 +0000
State-Changed-Why:
Izumi Tsutsui (submitter) confirms problem still exists.
Izumi; is it possible to provide more details of the remote server
host/path or URI ?
Can you reproduce this with the same download on a "faster" machine
to the same server?
(Or is the 64 KiB/s transfer rate an artifact of the existing
machine being slow, rather than the network connection?)
State-Changed-From-To: open->feedback
State-Changed-By: lukem@NetBSD.org
State-Changed-When: Sat, 12 Jun 2021 22:50:10 +0000
State-Changed-Why:
If possible, could you try to reproduce using the -current ftp(1)?
There are other fixes relating to signal handlers that haven't been
pulled-up to netbsd-9, and there's a _slight_ possibility that they
may also be relevant.
From: Izumi Tsutsui <tsutsui@ceres.dti.ne.jp>
To: gnats-bugs@netbsd.org
Cc: lukem@netbsd.org, tsutsui@ceres.dti.ne.jp
Subject: Re: bin/56129 (ftp(1) should keep control session during large xfer)
Date: Sun, 13 Jun 2021 12:15:36 +0900
> Izumi; is it possible to provide more details of the remote server
> host/path or URI ?
1)
https://pbs.twimg.com/media/E3tCjW2VgAMfjhQ.jpg
This one is a patched install RAMDISK with 20210603 ftp fetching
ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-9.2/x68k/base.tgz
on X68030
https://dmesgd.nycbug.org/index.cgi?do=view&id=6124
2)
https://pbs.twimg.com/media/E3uspBhUYAIFURZ.jpg
This one is a patched /usr/bin/ftp 20210603 against NetBSD 9.2 fetching
ftp://ftp7.jp.netbsd.org/pub/NetBSD/NetBSD-9.2/x68k/base.tgz
on the same X68030
3)
https://pbs.twimg.com/media/E2nuME0UUAAkeo1.jpg
This one is a plain NetBSD/luna68k 9.2 install RAMDISK fetching
ftp://ftp6.jp.netbsd.org/pub/NetBSD/NetBSD-9.2/luna68k/comp.tgz
on LUNA
https://dmesgd.nycbug.org/index.cgi?do=view&id=6115
4)
https://pbs.twimg.com/media/E3uicvFUUAYQ85j.jpg
This one is stock /usr/bin/ftp in NetBSD/hp300 9.1 fetching
ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-9.2/hp300/binary/sets/base.tgz
on HP9000/425t
https://dmesgd.nycbug.org/index.cgi?do=view&id=6114
> Can you reproduce this with the same download on a "faster" machine
> to the same server?
On Panasonic CF-NX3 (Core(TM) i3-4010U CPU @ 1.70GHz) and
stock NetBSD/amd64 9.2 with "ifconfig wm0 media 10baseT settings:
https://dmesgd.nycbug.org/index.cgi?do=view&id=6123
fetching ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-9.2/i386/binary/sets/debug.tgz
doesn't fail:
https://pbs.twimg.com/media/E3ujd-nVUAEp464.jpg
> (Or is the 64 KiB/s transfer rate an artifact of the existing
> machine being slow, rather than the network connection?)
- 10baseT wm(4) + ahcisata(4) + modern(?) Core-i3 (2C4T) gets
~250KiB/s (ftp.netbsd.org)
-> no control session timeout
- 10baseT le(4) + slow spc(4) SCSI + 68030 or 68040 get
64KiB/s (ftp.netbsd.org) or 125KiB/s (ftp6.jp.netbsd.org)
-> control session timeout (as above)
---
Some threshold around 200KiB/s, or depends on CPU load?
---
Izumi Tsutsui
From: mlelstv@serpens.de (Michael van Elst)
To: gnats-bugs@netbsd.org
Cc:
Subject: Re: bin/56129 (ftp(1) should keep control session during large xfer)
Date: Sun, 13 Jun 2021 06:28:26 -0000 (UTC)
tsutsui@ceres.dti.ne.jp (Izumi Tsutsui) writes:
> Some threshold around 200KiB/s, or depends on CPU load?
Some more datapoints:
Fetching on NetBSD/amiga 8.1 with a 10Mbit ethernet at ~115KiB/s (IPv4)
or ~106KiB/s (IPv6) from ftp6.jp.netbsd.org gets no timeout.
Using a NetBSD-current (1 week old) /rescue/ftp on the same machine
still shows no timeout.
From: "Martin Husemann" <martin@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc:
Subject: PR/56129 CVS commit: [netbsd-9] src/usr.bin/ftp
Date: Mon, 14 Jun 2021 11:45:49 +0000
Module Name: src
Committed By: martin
Date: Mon Jun 14 11:45:49 UTC 2021
Modified Files:
src/usr.bin/ftp [netbsd-9]: ftp.c
Log Message:
Pull up following revision(s) (requested by lukem in ticket #1293):
usr.bin/ftp/ftp.c: revision 1.172
set SO_KEEPALIVE on control connection
Attempt to prevent timeouts of the control connection by setting SO_KEEPALIVE.
This matches the equivalent behaviour in ftpd.
Note: This is a much simpler change than adding a background polling event
to invoke "STAT" (or "NOOP") on the control connection during a transfer.
(It's unclear from RFC 959 whether "NOOP" is even permitted during a transfer).
PR bin/56129
To generate a diff of this commit:
cvs rdiff -u -r1.168.2.3 -r1.168.2.4 src/usr.bin/ftp/ftp.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
From: "Martin Husemann" <martin@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc:
Subject: PR/56129 CVS commit: [netbsd-9] src/usr.bin/ftp
Date: Mon, 14 Jun 2021 11:57:39 +0000
Module Name: src
Committed By: martin
Date: Mon Jun 14 11:57:39 UTC 2021
Modified Files:
src/usr.bin/ftp [netbsd-9]: Makefile ssl.c ssl.h version.h
Log Message:
Pull up following revision(s) (requested by lukem in ticket #1295):
usr.bin/ftp/ssl.c: revision 1.10
usr.bin/ftp/ssl.h: revision 1.5
usr.bin/ftp/version.h: revision 1.93
usr.bin/ftp/Makefile: revision 1.39
use fetch_*() for I/O with SMALLPROG / !WITH_SSL builds
Adapt the SMALLPROG / -UWITH_SSL build to also use the fetch_*()
methods from ssl.c, instead of using stdio, as stdio isn't robust
when using interruptable signals.
Disable ssl-specific support in the fetch_*() methods if WITH_SSL
isn't defined, so SMALLPROG still doesn't have ssl support (as expected).
The resulting SMALLPROG binary is slightly larger than before
(e.g., 157KiB vs 153KiB on amd64).
Set version to 20210603 for this fix and the SO_KEEPALIVE fix for PR 56129.
PR install/56219
To generate a diff of this commit:
cvs rdiff -u -r1.37 -r1.37.12.1 src/usr.bin/ftp/Makefile
cvs rdiff -u -r1.8.2.1 -r1.8.2.2 src/usr.bin/ftp/ssl.c
cvs rdiff -u -r1.4 -r1.4.2.1 src/usr.bin/ftp/ssl.h
cvs rdiff -u -r1.87.18.2 -r1.87.18.3 src/usr.bin/ftp/version.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
From: Izumi Tsutsui <tsutsui@ceres.dti.ne.jp>
To: gnats-bugs@netbsd.org
Cc: lukem@netbsd.org, tsutsui@ceres.dti.ne.jp
Subject: Re: bin/56129 (ftp(1) should keep control session during large xfer)
Date: Sat, 19 Jun 2021 10:08:10 +0900
> State-Changed-Why:
> If possible, could you try to reproduce using the -current ftp(1)?
The control session timeout occurs on NetBSD/x68k INSTALL ramdisk
from NetBSD-daily/HEAD/202106141910Z/
https://pbs.twimg.com/media/E4NPDh7VkAAIISR.jpg
---
Izumi Tsutsui
State-Changed-From-To: feedback->open
State-Changed-By: dholland@NetBSD.org
State-Changed-When: Sat, 19 Jun 2021 20:46:05 +0000
State-Changed-Why:
still borked
From: RVP <rvp@SDF.ORG>
To: gnats-bugs@netbsd.org
Cc: lukem@netbsd.org, dholland@NetBSD.org, tsutsui@ceres.dti.ne.jp
Subject: Re: bin/56129 (ftp(1) should keep control session during large
xfer)
Date: Sat, 19 Jun 2021 21:01:37 +0000 (UTC)
This message is in MIME format. The first part should be readable text,
while the remaining parts are likely unreadable without MIME-aware tools.
--0-2040730550-1624136497=:20812
Content-Type: text/plain; charset=US-ASCII; format=flowed
On Sat, 19 Jun 2021, dholland@NetBSD.org wrote:
> Synopsis: ftp(1) should keep control session during large xfer
>
> State-Changed-From-To: feedback->open
> State-Changed-By: dholland@NetBSD.org
> State-Changed-When: Sat, 19 Jun 2021 20:46:05 +0000
> State-Changed-Why:
> still borked
>
I can reproduce this by throttling "get" to 30KB:
$ sudo tcpdump -w tcpdump-ftp.dump -i alc0 port 21
$ ftp -T get,30000 -d ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-9.2/amd64/binary/sets/*.xz
See attachment. Notice in the tcpdump log that for the 1st
file, base.tar.xz, after the xfer completes, the server
sends `226 Transfer complete.'. But, for the next file,
comp.tar.xz, after xfer is finished, the server doesn't
send *anything* at all--not even a FIN/ACK packet corresponding
to the FIN sent by the client after it times out. The kernel
has to send a RST to forcibly close the control connection.
-RVP
--0-2040730550-1624136497=:20812
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--0-2040730550-1624136497=:20812--
From: RVP <rvp@SDF.ORG>
To: gnats-bugs@netbsd.org
Cc: lukem@netbsd.org, tsutsui@ceres.dti.ne.jp
Subject: Re: bin/56129 (ftp(1) should keep control session during large
xfer)
Date: Sat, 19 Jun 2021 23:32:00 +0000 (UTC)
On Sat, 19 Jun 2021, RVP wrote:
> I can reproduce this by throttling "get" to 30KB:
>
> $ sudo tcpdump -w tcpdump-ftp.dump -i alc0 port 21
> $ ftp -T get,30000 -d ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-9.2/amd64/binary/sets/*.xz
>
> See attachment. Notice in the tcpdump log that for the 1st
> file, base.tar.xz, after the xfer completes, the server
> sends `226 Transfer complete.'. But, for the next file,
> comp.tar.xz, after xfer is finished, the server doesn't
> send *anything* at all--not even a FIN/ACK packet corresponding
> to the FIN sent by the client after it times out. The kernel
> has to send a RST to forcibly close the control connection.
>
I'm inclined to blame the FTP NAT impl. on my ISP-provided DSL-router.
A same test of downloading similarly-sized files using NetBSD's own
ftpd (on localhost--I have no other NetBSD machines) completed without
any problems.
-RVP
From: RVP <rvp@SDF.ORG>
To: gnats-bugs@netbsd.org
Cc: lukem@netbsd.org, tsutsui@ceres.dti.ne.jp
Subject: Re: bin/56129 (ftp(1) should keep control session during large
xfer)
Date: Sun, 20 Jun 2021 20:38:24 +0000 (UTC)
On Sat, 19 Jun 2021, RVP wrote:
> I'm inclined to blame the FTP NAT impl. on my ISP-provided DSL-router.
>
In my case it definitely is the broken FTP NAT in my DSL-router:
In the previous FTP download tests, since:
base.tar.xz -> DL time = 42313304 bytes received in 23:44 -> ctl. conn OK
comp.tar.xz -> DL time = 60781064 bytes received in 34:06 -> ctl. conn closed
I set TCP keepalive to 20 mins:
$ sudo sysctl -w net.inet.tcp.keepidle=$(( (20*60) * $(sysctl -n net.inet.tcp.slowhz) ))
And, using NetBSD-ftp 20210603, all the files came through without a
hitch:
-----
$ ftp -T get,30000 -d ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-9.2/amd64/binary/sets/*.xz
Get transfer rate throttle: on; maximum: 30000; increment 1024.
isipv6addr: got 0 for ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-9.2/amd64/binary/sets/*.xz
fetch_ftp: `ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-9.2/amd64/binary/sets/*.xz'
parse_url: URL `ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-9.2/amd64/binary/sets/*.xz'
parse_url: user `<null>' pass `<null>' host ftp.netbsd.org port ftp(21) path `pub/NetBSD/NetBSD-9.2/amd64/binary/sets/*.xz'
fetch_ftp: user `<null>' pass `<null>' host ftp.netbsd.org port ftp path `pub/NetBSD/NetBSD-9.2/amd64/binary/sets' dir `pub/NetBSD/NetBSD-9.2/amd64/binary/sets' file `*.xz'
Trying [2001:470:a085:999::21]:21 ...
setupsockbufsize: rcvbuf_size determined as 32768
setupsockbufsize: sndbuf_size determined as 32768
ftp: Can't connect to `2001:470:a085:999::21:21': No route to host
Trying 199.233.217.201:21 ...
Connected to ftp.netbsd.org.
220 ftp.NetBSD.org FTP server (NetBSD-ftpd 20180428) ready.
ftp_login: user `<null>' pass `<null>' host `ftp.netbsd.org'
---> USER anonymous
331 Guest login ok, type your name as password.
---> PASS XXXX
230-
...
19703048 bytes received in 11:08 (28.79 KiB/s)
---> MDTM xserver.tar.xz
213 20210512195146
remotemodtime: parsed time `20210512195146' as 1620849106, Wed, 12 May 2021 19:51:46 +0000
---> QUIT
221-
Data traffic for this session was 696130340 bytes in 21 files.
Total traffic for this session was 696140384 bytes in 22 transfers.
221 Thank you for using the FTP service on ftp.NetBSD.org.
$
-----
Reinforcing my notion that my DSL router has a flawed FTP NAT impl.,
I see that NetBSD sending a RST packet after the ctl. conn. is closed:
-----
08:49:51.192501 IP 192.168.68.121.65314 > 199.233.217.201.21: Flags [F.], seq 321, ack 4693, win 4197, options [nop,nop,TS val 23453 ecr 21360], length 0
08:50:55.192257 IP 192.168.68.121.65314 > 199.233.217.201.21: Flags [F.], seq 321, ack 4693, win 4197, options [nop,nop,TS val 23581 ecr 21360], length 0
08:51:59.192000 IP 192.168.68.121.65314 > 199.233.217.201.21: Flags [F.], seq 321, ack 4693, win 4197, options [nop,nop,TS val 23709 ecr 21360], length 0
08:53:03.191753 IP 192.168.68.121.65314 > 199.233.217.201.21: Flags [F.], seq 321, ack 4693, win 4197, options [nop,nop,TS val 23837 ecr 21360], length 0
08:54:07.191498 IP 192.168.68.121.65314 > 199.233.217.201.21: Flags [R.], seq 322, ack 4693, win 4197, length 0
-----
causes my wired connection to the wireless extender to drop its
carrier (this happens pretty consistently, though god knows why):
-----
Jun 20 08:55:58 x202e dhcpcd[444]: alc0: carrier lost - roaming
Jun 20 08:56:17 x202e dhcpcd[444]: alc0: carrier acquired
Jun 20 08:56:17 x202e dhcpcd[444]: alc0: IAID 5d:32:67:54
Jun 20 08:56:18 x202e dhcpcd[444]: alc0: soliciting an IPv6 router
Jun 20 08:56:19 x202e dhcpcd[444]: alc0: Router Advertisement from fe80::da47:32ff:fea8:b288
Jun 20 08:56:19 x202e dhcpcd[444]: alc0: no global addresses for default route
Jun 20 08:56:19 x202e dhcpcd[444]: alc0: soliciting a DHCPv6 lease
Jun 20 08:57:18 x202e dhcpcd[444]: alc0: carrier lost - roaming
Jun 20 08:57:35 x202e dhcpcd[444]: alc0: carrier acquired
Jun 20 08:57:35 x202e dhcpcd[444]: alc0: IAID 5d:32:67:54
Jun 20 08:57:36 x202e dhcpcd[444]: alc0: soliciting an IPv6 router
Jun 20 08:57:36 x202e dhcpcd[444]: alc0: Router Advertisement from fe80::da47:32ff:fea8:b288
Jun 20 08:57:36 x202e dhcpcd[444]: alc0: no global addresses for default route
Jun 20 08:57:36 x202e dhcpcd[444]: alc0: soliciting a DHCPv6 lease
-----
-RVP
From: Izumi Tsutsui <tsutsui@ceres.dti.ne.jp>
To: gnats-bugs@netbsd.org
Cc: rvp@SDF.ORG, tsutsui@ceres.dti.ne.jp
Subject: Re: bin/56129 (ftp(1) should keep control session during largexfer)
Date: Wed, 23 Jun 2021 02:45:26 +0900
> I can reproduce this by throttling "get" to 30KB:
>
> $ sudo tcpdump -w tcpdump-ftp.dump -i alc0 port 21
> $ ftp -T get,30000 -d ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-9.2/amd64/binary/sets/*.xz
:
Today I cannot reproduce the control session timeout on
my HP9000/425t (68040 25MHz / 48MB):
https://pbs.twimg.com/media/E4f1dL1VkAc3hEh.jpg
either on GENERIC and /usr/bin/ftp or RAMDISK kernel crunched one.
I'll also check again slower 68030 machines (luna68k and x68k).
---
Izumi Tsutsui
From: RVP <rvp@SDF.ORG>
To: gnats-bugs@netbsd.org
Cc: lukem@netbsd.org, tsutsui@ceres.dti.ne.jp
Subject: Re: bin/56129 (ftp(1) should keep control session during
largexfer)
Date: Tue, 22 Jun 2021 21:06:31 +0000 (UTC)
On Tue, 22 Jun 2021, Izumi Tsutsui wrote:
> Today I cannot reproduce the control session timeout on
> my HP9000/425t (68040 25MHz / 48MB):
> https://pbs.twimg.com/media/E4f1dL1VkAc3hEh.jpg
> either on GENERIC and /usr/bin/ftp or RAMDISK kernel crunched one.
>
> I'll also check again slower 68030 machines (luna68k and x68k).
>
From the screenshot:
41046620 bytes received in 06:00 (111.23 KiB/s)
That's just 6 mins. Try downloading `debug.tar.xz' which should
take more than 15 mins. From your past screenshots, my feeling
is that any _single_ transfer which leaves the control connection
idle for >15min. will simply be dropped silently by your FTP NAT.
-RVP
From: Izumi Tsutsui <tsutsui@ceres.dti.ne.jp>
To: rvp@SDF.ORG
Cc: gnats-bugs@netbsd.org, lukem@netbsd.org, tsutsui@ceres.dti.ne.jp
Subject: Re: bin/56129 (ftp(1) should keep control session duringlargexfer)
Date: Thu, 24 Jun 2021 00:21:27 +0900
> > Today I cannot reproduce the control session timeout on
> > my HP9000/425t (68040 25MHz / 48MB):
> > https://pbs.twimg.com/media/E4f1dL1VkAc3hEh.jpg
> > either on GENERIC and /usr/bin/ftp or RAMDISK kernel crunched one.
> >
> > I'll also check again slower 68030 machines (luna68k and x68k).
> >
>
> From the screenshot:
>
> 41046620 bytes received in 06:00 (111.23 KiB/s)
>
> That's just 6 mins. Try downloading `debug.tar.xz' which should
> take more than 15 mins. From your past screenshots, my feeling
> is that any _single_ transfer which leaves the control connection
> idle for >15min.
The similar timeout occured 6minsq or 8 mins so there might be
more conditions, but anyway I'll try reproduce on slower machines
or large files.
https://pbs.twimg.com/media/E3uicvFUUAYQ85j.jpg
https://pbs.twimg.com/media/E3uspBhUYAIFURZ.jpg
> will simply be dropped silently by your FTP NAT.
Yes, there are two NAT (NetBSD/i386 9.2 npf with ipfilter compat one,
and NTT(the line service provider)'s "Home Gateway"), so they could be
problematic.
Thanks,
---
Izumi Tsutsui
From: RVP <rvp@SDF.ORG>
To: Izumi Tsutsui <tsutsui@ceres.dti.ne.jp>
Cc: gnats-bugs@netbsd.org, lukem@netbsd.org
Subject: Re: bin/56129 (ftp(1) should keep control session duringlargexfer)
Date: Wed, 23 Jun 2021 20:31:39 +0000 (UTC)
On Thu, 24 Jun 2021, Izumi Tsutsui wrote:
> The similar timeout occured 6minsq or 8 mins so there might be
> more conditions, but anyway I'll try reproduce on slower machines
> or large files.
> https://pbs.twimg.com/media/E3uicvFUUAYQ85j.jpg
> https://pbs.twimg.com/media/E3uspBhUYAIFURZ.jpg
>
Hmm, now I wonder if you have the same problem that I have: an
overly aggressive FTP NAT timeout (my timeouts are pretty consistent:
~30 mins). Can you do a tcpdump of port 21?
In any case, ftp(1) will have to be modified to either:
a) send periodic keepalive commands during long xfers, or
b) for non-nteractive xfers, re-connect and fetch the rest of the
files in a list. (Most of the code for this is already there;
just needs a bit of re-arrangement.)
-RVP
From: =?UTF-8?B?SmFyb23DrXIgRG9sZcSNZWs=?= <jaromir.dolecek@gmail.com>
To: "gnats-bugs@NetBSD.org" <gnats-bugs@netbsd.org>
Cc:
Subject: Re: bin/56129 (ftp(1) should keep control session duringlargexfer)
Date: Wed, 23 Jun 2021 22:46:19 +0200
Le mer. 23 juin 2021 =C3=A0 22:35, RVP <rvp@sdf.org> a =C3=A9crit :
> In any case, ftp(1) will have to be modified to either:
> a) send periodic keepalive commands during long xfers, or
> b) for non-nteractive xfers, re-connect and fetch the rest of the
> files in a list. (Most of the code for this is already there;
> just needs a bit of re-arrangement.)
ftp client enables SO_KEEPALIVE, which should be the same as actually
sending a dummy command every so often.
I have no idea why it doesn't help. Maybe the keep-alive packets get
ignored by the router, and it doesn't refresh it's NAT inactivity
timeout.
Did anyone confirm via tcpdump whether the keep-alive packets are
actually sent by the kernel for the control connection?
Jaromir
From: RVP <rvp@SDF.ORG>
To: gnats-bugs@netbsd.org
Cc: lukem@netbsd.org, jaromir.dolecek@gmail.com, tsutsui@ceres.dti.ne.jp
Subject: Re: bin/56129 (ftp(1) should keep control session duringlargexfer)
Date: Wed, 23 Jun 2021 21:21:06 +0000 (UTC)
This message is in MIME format. The first part should be readable text,
while the remaining parts are likely unreadable without MIME-aware tools.
--0-2045945096-1624483267=:12300
Content-Type: text/plain; charset=ISO-8859-2; format=flowed
Content-Transfer-Encoding: 8BIT
On Wed, 23 Jun 2021, Jaromír Doleček wrote:
> ftp client enables SO_KEEPALIVE, which should be the same as actually
> sending a dummy command every so often.
>
The system-wide keepalive timeout is 2 hrs, but, my gateway times out
idle connections after ~ 30 mins.
> Did anyone confirm via tcpdump whether the keep-alive packets are
> actually sent by the kernel for the control connection?
>
Yes, they are sent:
https://mail-index.netbsd.org/netbsd-bugs/2021/06/20/msg072210.html
I have the tcpdump for that session; just didn't post it as I didn't
feel it was necessary because of the other logs I included.
-RVP
--0-2045945096-1624483267=:12300--
From: Havard Eidnes <he@NetBSD.org>
To: gnats-bugs@netbsd.org, rvp@SDF.ORG
Cc: lukem@netbsd.org, netbsd-bugs@netbsd.org, tsutsui@ceres.dti.ne.jp
Subject: Re: bin/56129 (ftp(1) should keep control session during large
xfer)
Date: Thu, 24 Jun 2021 00:45:15 +0200 (CEST)
> I set TCP keepalive to 20 mins:
>
> $ sudo sysctl -w net.inet.tcp.keepidle=3D$(( (20*60) * $(sysctl -n n=
et.inet.tcp.slowhz) ))
Oh?
On my host that operation would set it to 40 minutes.
tcp(4) says the default value for TCP_KEEPIDLE is 4 hours, which
corresponds to
net.inet.tcp.keepidle =3D 14400
which means this value should be specified in seconds.
So if you have a device on the path with a 30min NAT translation
time-out, you'll still lose.
Regards,
- H=E5vard
From: RVP <rvp@SDF.ORG>
To: Havard Eidnes <he@NetBSD.org>
Cc: gnats-bugs@netbsd.org, lukem@netbsd.org, tsutsui@ceres.dti.ne.jp
Subject: Re: bin/56129 (ftp(1) should keep control session during large
xfer)
Date: Wed, 23 Jun 2021 23:08:27 +0000 (UTC)
This message is in MIME format. The first part should be readable text,
while the remaining parts are likely unreadable without MIME-aware tools.
--0-577458017-1624489708=:10413
Content-Type: text/plain; charset=US-ASCII; format=flowed
On Thu, 24 Jun 2021, Havard Eidnes wrote:
>> I set TCP keepalive to 20 mins:
>>
>> $ sudo sysctl -w net.inet.tcp.keepidle=$(( (20*60) * $(sysctl -n net.inet.tcp.slowhz) ))
>
> On my host that operation would set it to 40 minutes.
>
> tcp(4) says the default value for TCP_KEEPIDLE is 4 hours, which
> corresponds to
>
> net.inet.tcp.keepidle = 14400
>
> which means this value should be specified in seconds.
>
Yes, this puzzled me a bit too. But, sysctl(7) says:
tcp.slowhz
The units for tcp.keepidle and tcp.keepintvl; those
variables are in ticks of a clock that ticks tcp.slowhz
times per second. (That is, their values must be divided
by the tcp.slowhz value to get times in seconds.)
And, the timestamps in the tcpdump (attached) correspond.
$ uname -a
NetBSD x202e.localdomain 9.99.82 NetBSD 9.99.82 (GENERIC) #0: Sat May 8 19:36:28 UTC 2021 mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/amd64/compile/GENERIC amd64
-RVP
--0-577458017-1624489708=:10413
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--0-577458017-1624489708=:10413--
From: "Luke Mewburn" <lukem@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc:
Subject: PR/56129 CVS commit: othersrc/usr.bin/tnftp/src
Date: Fri, 27 Aug 2021 01:33:00 +0000
Module Name: othersrc
Committed By: lukem
Date: Fri Aug 27 01:33:00 UTC 2021
Update of /cvsroot/othersrc/usr.bin/tnftp/src
In directory ivanova.netbsd.org:/tmp/cvs-serv779
Log Message:
Import NetBSD ftp 20210826
Notable changes since import tag NetBSD-2021-01-31:
* Use fetch_* instead of stdio to fix support with interruptable signals.
* Fix typos in comments.
* Manual page improvements. NetBSD PR bin/51883.
* Set SO_KEEPALIVE on control connection to attempt to avoid timeouts.
NetBSD PR bin/56129.
* Validate address in server's PASV and LPSV responses.
Previously a hostile server could cause ftp to open a data connection elsewhere.
* Remove unnecessary variable assignments.
Status:
Vendor Tag: NetBSD
Release Tags: NetBSD-20210826
C othersrc/usr.bin/tnftp/src/ssl.h
U othersrc/usr.bin/tnftp/src/complete.c
C othersrc/usr.bin/tnftp/src/fetch.c
U othersrc/usr.bin/tnftp/src/progressbar.c
C othersrc/usr.bin/tnftp/src/ftp.c
U othersrc/usr.bin/tnftp/src/ftp_var.h
U othersrc/usr.bin/tnftp/src/cmdtab.c
C othersrc/usr.bin/tnftp/src/ssl.c
U othersrc/usr.bin/tnftp/src/main.c
C othersrc/usr.bin/tnftp/src/Makefile
U othersrc/usr.bin/tnftp/src/progressbar.h
U othersrc/usr.bin/tnftp/src/ruserpass.c
C othersrc/usr.bin/tnftp/src/version.h
C othersrc/usr.bin/tnftp/src/ftp.1
U othersrc/usr.bin/tnftp/src/cmds.c
U othersrc/usr.bin/tnftp/src/extern.h
C othersrc/usr.bin/tnftp/src/util.c
U othersrc/usr.bin/tnftp/src/domacro.c
8 conflicts created by this import.
Use the following command to help the merge:
cvs checkout -jNetBSD:yesterday -jNetBSD othersrc/usr.bin/tnftp/src
State-Changed-From-To: open->closed
State-Changed-By: tsutsui@NetBSD.org
State-Changed-When: Sat, 13 Aug 2022 22:30:10 +0000
State-Changed-Why:
I've tried ftp install for both NetBSD/luna68k 9.3 on 68030 LUNA
and NetBSD/x68k 9.3 on 68030 X68030 from ftp.NetBSD.org, then
there is no timeout through full upgrade installation.
The installation problem seems solved and maybe I missed something
in my past tests.
From: RVP <rvp@SDF.ORG>
To: gnats-bugs@netbsd.org
Cc: lukem@netbsd.org, tsutsui@NetBSD.org
Subject: Re: bin/56129 (ftp(1) should keep control session during large
xfer)
Date: Tue, 7 Nov 2023 23:44:53 +0000 (UTC)
On Sat, 13 Aug 2022, tsutsui@NetBSD.org wrote:
> State-Changed-From-To: open->closed
> State-Changed-By: tsutsui@NetBSD.org
> State-Changed-When: Sat, 13 Aug 2022 22:30:10 +0000
> State-Changed-Why:
> I've tried ftp install for both NetBSD/luna68k 9.3 on 68030 LUNA
> and NetBSD/x68k 9.3 on 68030 X68030 from ftp.NetBSD.org, then
> there is no timeout through full upgrade installation.
> The installation problem seems solved and maybe I missed something
> in my past tests.
>
Made this patch quite a while ago, then forgot I had done it.
Redone for latest ftp source. It sets TCP_KEEPIDLE & TCP_KEEPINTVL
(tied to `quit_time' now, but, can easily be parametrized) which
is supported on Linux, Free & NetBSD. This should work to keep
the control channel alive.
-RVP
---START---
diff -urN ftp.orig/ftp.c ftp/ftp.c
--- ftp.orig/ftp.c 2023-05-06 03:41:38.122163042 +0000
+++ ftp/ftp.c 2023-11-07 23:41:33.236539000 +0000
@@ -290,6 +290,23 @@
DWARN("setsockopt %s (ignored)", "SO_OOBINLINE");
}
+#if defined(TCP_KEEPIDLE) && defined(TCP_KEEPINTVL)
+#include <netinet/tcp.h>
+{
+ unsigned int idle_time;
+ idle_time = quit_time > 300 ? (quit_time * 3) / 4 : 300;
+ if (setsockopt(s, IPPROTO_TCP, TCP_KEEPIDLE,
+ &idle_time, sizeof(idle_time)) == -1) {
+ DWARN("setsockopt %s (ignored)", "TCP_KEEPIDLE");
+ }
+
+ if (setsockopt(s, IPPROTO_TCP, TCP_KEEPINTVL,
+ &idle_time, sizeof(idle_time)) == -1) {
+ DWARN("setsockopt %s (ignored)", "TCP_KEEPINTVL");
+ }
+}
+#endif
+
return (hostname);
bad:
(void)close(s);
---END---
>Unformatted:
(Contact us)
$NetBSD: query-full-pr,v 1.47 2022/09/11 19:34:41 kim Exp $
$NetBSD: gnats_config.sh,v 1.9 2014/08/02 14:16:04 spz Exp $
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