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strange swaks error
by Russell Coker 14 Oct '18

14 Oct '18

Received: from othello.dycom.com.au (othello [203.15.121.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: ***(a)coker.com.au) by smtp.sws.net.au (Postfix) with ESMTPSA id 02BDEEC07 for <***(a)coker.com.au>; Sun, 7 Oct 2018 10:31:14 +1100 (AEDT) Date: Sun, 07 Oct 2018 10:31:10 +1000 Above are partial headers from a test message sent by swaks. Seems that the VM receiving mail had the right daylight savings configuration while the system running swaks had the right date but gave the wrong timezone (thus triggering an alert for mail taking an hour to deliver). Any ideas for why swaks would do this? I'm setting up a VM to test swaks as mentioned in my previous message. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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apcupsd / system reboot
by Brian May 14 Oct '18

14 Oct '18

Hello, For a while now I have had this problem that apcupsd doesn't restart properly on system boot - e.g. after power failure. The log appears fine: 2018-10-11 16:43:44 +1100 apcupsd 3.14.14 (31 May 2016) debian startup succeeded I can't remember for sure if the process is running or not. I think it might be, just to confuse matters more. However there is no connection been establed to the device (using SNMP over IP) and "apcaccess" reports dummy values. Furthermore it doesn't do anything on a power failure. If I manually restart it it starts working fine: /etc/init.d/apcupsd restart The logs appear as before: 2018-10-11 18:48:15 +1100 apcupsd exiting, signal 15 2018-10-11 18:48:15 +1100 apcupsd shutdown succeeded 2018-10-11 18:48:15 +1100 apcupsd 3.14.14 (31 May 2016) debian startup succeeded But now "apcaccess" returns correct values. Any ideas? I thought maybe the problem was using the hostname in /etc/apcupsd/apcupsd.conf and putting the lookup in /etc/hosts - should work but was wondering if it was trying to use DNS regardless and DNS is provided by a VM on the box that is still booting. So I now put the IP address in /etc/apcupsd/apcupsd.conf, but it is still failing. Regards -- Brian May <brian(a)linuxpenguins.xyz> https://linuxpenguins.xyz/brian/

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strange 6in4 errors - what does "RX errors" mean?
by Russell Coker 29 Sep '18

29 Sep '18

# ifconfig 6in4 6in4: flags=209<UP,POINTOPOINT,RUNNING,NOARP> mtu 1280 inet6 2a01:4f8:140:71f5:1::ffff prefixlen 128 scopeid 0x0<global> inet6 fe80::a08:1 prefixlen 64 scopeid 0x20<link> inet6 fe80::2e04:7ca5 prefixlen 64 scopeid 0x20<link> inet6 fe80::a0a:a01 prefixlen 64 scopeid 0x20<link> sit txqueuelen 1 (IPv6-in-IPv4) RX packets 563 bytes 69361 (67.7 KiB) RX errors 1200 dropped 0 overruns 0 frame 1200 TX packets 600 bytes 164726 (160.8 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 Above is the result of running ifconfig on my 6in4 device. The problem is the "RX errors" which correspond to ICMP packets missing. The system at the far end of the 6in4 link has monitoring that includes "ping6 www.google.com", until recently that was fine, since upgrading to Debian kernel 4.9.0-7-amd64 #1 SMP Debian 4.9.110-1 problems have started. The problems are somewhat intermittent. I don't expect that the recent Debian kernel upgrade broke this, maybe the reboot exposed some other problem. Does anyone know what "RX errors" means in the context of 6in4 interfaces on Linux? Is there any way of getting the kernel to log every error to dmesg or something? I expect this will be a really easy problem to solve once I know what the errors mean. When the errors happen I run tcpdump on the far end of the 6in4 link and see the packets going out, I run tcpdump on the ethernet device and see the encapsulated packets going in, and when I run tcpdump on the 6in4 device I don't see those packets but I do see packets for local ipv6 addresses. Here's the /etc/network/interfaces section from the server: auto 6in4 iface 6in4 inet6 v4tunnel address 2a01:4f8:140:71f5:1::ffff netmask 128 endpoint 203.15.121.80 ttl 64 up ip link set mtu 1280 dev 6in4 up ip route add 2a01:4f8:140:71f5:1::/96 dev 6in4 Here's the /etc/network/interfaces section from the other end: auto 6in4 iface 6in4 inet6 v4tunnel address 2a01:4f8:140:71f5:1::1 netmask 128 endpoint 46.4.124.165 ttl 64 up ip route add 2a01:4f8:140:71f5:1::ffff dev 6in4 up ip link set mtu 1280 dev 6in4 up ip route add 2000::/3 dev 6in4 Here's the result of running tcpdump on the server, those encapsulated packets look ok and should go to the 6in4 device. # tcpdump -i br0 -n host 203.15.121.80 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on br0, link-type EN10MB (Ethernet), capture size 262144 bytes 01:18:57.333752 IP 203.15.121.80 > 46.4.124.165: IP6 2a01:4f8:140:71f5:1::4 > 2404:6800:4006:800::2004: ICMP6, echo request, seq 14, length 64 01:18:58.357831 IP 203.15.121.80 > 46.4.124.165: IP6 2a01:4f8:140:71f5:1::4 > 2404:6800:4006:800::2004: ICMP6, echo request, seq 15, length 64 01:18:59.381702 IP 203.15.121.80 > 46.4.124.165: IP6 2a01:4f8:140:71f5:1::4 > 2404:6800:4006:800::2004: ICMP6, echo request, seq 16, length 64 01:19:00.405686 IP 203.15.121.80 > 46.4.124.165: IP6 2a01:4f8:140:71f5:1::4 > 2404:6800:4006:800::2004: ICMP6, echo request, seq 17, length 64 Any ideas? -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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Apache + Open Office Headless
by Piers 26 Sep '18

26 Sep '18

Hi there, I have a VM with 16GB RAM and 8 Cores. It's job is to accept a HTTP request using PHP, take the data (documents) and run open office to convert it to plain text and return it. Up until now this process has been fine. It seems that the server hangs as it just gets overloaded. I've just changed the cron jobs from the sending servers to space them apart and also upped max / min spare servers. Previously I have tried other approaches like the JAVA headless and running OO as services and using HA Proxy. They haven't been successful (could have been my implementations). The script loads its own version of OO each time a connection is made. Is there a better way of doing this? Seems like an awfully big VM to falls over/hang all the time. Your help / ideas / rants are appreciated. Thanks Piers

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Appointment reminder app
by Lindsay W 13 Sep '18

13 Sep '18

I am looking for a simply appointment reminder app, I am NOT interested in anything online. As well as normal appointments I would like to be able to put in events that occur on particular day of the month, such as "2nd saturday, Local market". BSD Calendar would do exactly what I want but i cannot get it to print anything. When the command is run it does read the "calendar" file (checked that with ltrace), but never prints anything. Has anybody got BSD calendar to work, what should the data file look like. It would not be to difficult to write a simple app to do this but SURELY there must be something out there, hmmmmm a look at the source of BSD Calendar would probably be usefull. Lindsay

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Re: ArgyllCMS, DisplayCal and the X-Rite i1 Studio
by Andrew Greig 06 Sep '18

06 Sep '18

Hi All, If we have any photographers in the list, has anyone been able to use the Display Colorimeter and Photo Spectrometer features of this device under Linux? (Specifically Ubuntu 18.04)? It is an expensive piece of kit, but I need to be able to print with certainty, because printing is so damn expensive. The alternative is to find a way to profile the roll printers used by Office works or other print services. Many thanks Andrew Greig

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TLS 1.2 etc
by Russell Coker 03 Sep '18

03 Sep '18

https://techcommunity.microsoft.com/t5/Skype-for-Business-Blog/Preparing-fo… https://lists.luv.asn.au/pipermail/luv-main/2016-February/008977.html As part of my work I received the above announcement from MS about dropping support for TLS versions below 1.2. This was the topic of some discussion here in 2016. https://mozilla.github.io/server-side-tls/ssl-config-generator/ Inspired by the MS announcement I went to the above site and generated the most secure configuration for "modern" systems. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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MTP probe of USB drive
by Jason White 26 Aug '18

26 Aug '18

Upon attaching a USB hard drive to an old, but up to date, Linux laptop last weekend, the block device corresponding to the drive was not created. The kernel logs showed that the USB device was probed for mtp support, which failed. After searching the Web, the solution that I found was to create a script in /etc/profile.d containing Export MTP_NO_PROBE=1 Are there better solutions than disabling MTP probes altogether?

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expect script
by cory seligman 20 Aug '18

20 Aug '18

Hi All, I'm having some trouble making expect work. I need it to talk to some vintage equipment over usb serial, and I think I'm getting hung up on opening the port. When the script runs, it just connects to the device and sits there. I can drive it interactively, but it doesn't attempt to automate anything. Any ideas? Thanks. My expect script looks like this: #!/usr/bin/expect -f # device set modem /dev/ttyUSB0 # keep it open exec sh -c "sleep 3 < $modem" & # serial port parameters exec stty -F $modem 2400 raw -clocal -echo -istrip -hup # connect send_user "connecting to $modem, exit with ~,\n" spawn -open [open $modem w+] interact { ~, exit ~~ {send "\034"} } set force_conservative 1 ;# set to 1 to force conservative mode even if ;# script wasn't run conservatively originally if {$force_conservative} { set send_slow {1 .1} proc send {ignore arg} { sleep .1 exp_send -s -- $arg } } set timeout -1 match_max 100000 send -- "\r" send -- "\r" expect ">" send -- "p 7d91\r" expect ">" send -- "p b2ff\r" expect ">" send -- "h\r" expect ">" send -- "td\r" expect "td\r 18 215 12 24 33\r >" send -- "gd 215\r" expect eof

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Compose::Melbourne Functional Programming event coming up, 27-28 August 2018
by Les Kitchen 19 Aug '18

19 Aug '18

Dear fellow LUV members, Compose::Melbourne is running this year for the third time, coming up in just over a week: http://www.composeconference.org/2018-melbourne/ It's a two-day event, aimed at building and supporting the functional-programming community in Melbourne. So if you're at all interested in functional programming, newbie or expert, come along and learn and meet people sharing that interest. I know this is not Linux-specific, but most of the main functional-programming systems are FOSS (and Linux-friendly), and functional programming is being increasingly adopted in industry. Day One, Monday 27 August, is the conference, with a dozen presentations on functional programming (FP) through the day, including keynote "The Unreasonable Effectiveness of Metaphor" by Julie Moronuki, author of the book, Haskell Programming from First Principles. Day Two, Tuesday 28 August, is the "unconference": an informal day of getting together to share FP ideas and experience, although we will be running a few workshops and sessions, including CRASHKELL, an introductory Haskell workshop for beginners. You can read the webpage for more information about the programme and registration. In particular, if you're planning to attend any of the workshops, check the requirements. You'll probably need to bring a laptop, and for some workshops you'll need to install software ahead of time — though we can help you with that on the day if need be. We really want to help build the diversity of the functional-programming community, so we've tried to keep the registration cost as low as possible. But if you'd like to attend, and still face difficulty paying the registration fee, mail me, ljk+compose(a)ljk.id.au. We have a limited number of free tickets available for this purpose. Also feel free to mail me if you have any other questions not answered on the website. Hope to see some of you at Compose::Melbourne! — Smiles, Les (also Compose::Melbourne committee member).

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