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Archive for the ‘*nix-tools’ Category

Fixing Invalid HELO’s – major.io

Posted by jpluimers on 2017/12/08

for postfix and sendmail: [WayBackFixing Invalid HELO’s – major.io

Posted in *nix, *nix-tools, postfix, Power User, sendmail | Leave a Comment »

iptables debugging « \1

Posted by jpluimers on 2017/11/28

Using the TRACE target: [WayBackiptables debugging « \1 via [WayBack] iptables Debugging using the TRACE chain – Kristian Köhntopp – Google+

Docs:

TRACE
This target marks packes so that the kernel will log every rule which match the packets as those traverse the tables, chains,
rules. (The ipt_LOG or ip6t_LOG module is required for the logging.) The packets are logged with the string prefix: “TRACE:
tablename:chainname:type:rulenum ” where type can be “rule” for plain rule, “return” for implicit rule at the end of a user
defined chain and “policy” for the policy of the built in chains.
It can only be used in the raw table.

Way more details in the linked article.

–jeroen

Posted in *nix, *nix-tools, Firewall, Infrastructure, iptables, Power User | Leave a Comment »

TLS tests for your mail server

Posted by jpluimers on 2017/11/09

Need to do some more research on this to ensure I didn’t goof up:

–jeroen

Posted in *nix, *nix-tools, Communications Development, Development, Internet protocol suite, postfix, Power User, Security, sendmail, SMTP | Leave a Comment »

MX Backup – Postfix Email Server | samhobbs.co.uk

Posted by jpluimers on 2017/11/09

Interesting as it has steps for both OpenSuSE and Debian each well suited for running on a Raspberry Pi.

[WayBackMX Backup – Postfix Email Server | samhobbs.co.uk

It seems postfix is a lot easier to configure than sendmail so I already like it.

First I need to read a bit more in Postfix greylisting.

I’ll need to catch up on Sam’s other parts with the postfix tag as well:

–jeroen

Posted in *nix, *nix-tools, Debian, Development, Hardware Development, Linux, openSuSE, Power User, Raspberry Pi, Raspbian, sendmail, SuSE Linux, Tumbleweed | Leave a Comment »

bash: `printf` supports `\e` just like `echo -e` does

Posted by jpluimers on 2017/11/07

Learned a few things when modifying https://github.com/gkotian/gautam_linux/blob/master/scripts/colours.sh

Note: `printf` supports emitting `ESC` (ASCII character `\033` aka `27` aka `0x1B`)as `\e` the same way that `echo` does

https://linux.die.net/man/1/printf
https://linux.die.net/man/1/echo

Format strings are at https://linux.die.net/man/3/printf
%-10s means left adjusted (aligned) string of length 10

–jeroen

via:

I was investigating how the colour definitions on my OpenSuSE system actually work internally so I added some extra output: ${TYPE} and ${COLOUR}.

Source: Show type and colour definition in addition to the rendered colour. by jpluimers · Pull Request #5 · gkotian/gautam_linux

Posted in *nix, *nix-tools, bash, bash, Development, Linux, openSuSE, Power User, Scripting, Software Development, SuSE Linux | Leave a Comment »

 
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