The dnsfwd from randomstuff

dnsfwd's Introduction

A collection of simple programs/scripts which I found useful at some point but which do not deserve a repository on their own

Admin (admin/):

gnt-instance-vnc-connect, open a RDP connection to a Ganeti instance from a Ganeti node

CMS (cms/):

joomla_to_wordpress_redirect, generate redirections for a Joomla to WordPress migration.

Content:

cbor2json convert CBOR to JSON
cleanup_html, cleanup HTML snippet
fods2html.xsl, convert OpenDocument plain XML spreadsheets (.fods) into HTML
grexpath, like grep buth with XPATH expression
json2cbor, convert JSON to CBOR
json2msgpack, convert JSON to MessagePack
json2yaml, convert JSON to YAML
msgpack2json, convert MessagePack to JSON
splitasciiarmor, split ASCII Armor (or PEM) files into multiple files
tilt-render, CLI for Ruby Tilt
tsv2html, convert TSV to HTML <table>
yaml2json, convert YAML to JSON
decode-hc1-covid-certificate, decode a HC1 COVID certificate
zlibcat, decompress raw zlib

Desktop (desktop/)

gui_filter, filter the content of the clipboard/selection through a UNIX command
keybinder, execute a program when a global keyboard shortcut is triggered
pulse-mute-toggle, toggle PulseAudio default source mute with desktop notification
pushtotalk, push-to-talk using PulseAudio
take-screenshot, take a screenhot
which-theme, which themes are available in both GTK2 and GTK3?
xrandr-helper, helper for xrandr
xsettings-query, dump XSETTINGS

Devices (device/):

feel-my-power, display notification about battery status of devices (eg. for wireless gamepad) using upower

Disk (disk/):

mount-diskimage, mount an image (ISO) using udisks2
xdg-open-diskimage

Misc (misc/):

askpass
sleep-exponential, like sleep with following an exponential distribution

Network (network/):

rmcp-discover, discover RMCP nodes (such as AMT or IPMI) on the LAN
ssdp-listen.py, listen for SSDP announces and dump responses
ssdp-search.py, launch a SSDP search request and dump responses
upnp-display-interfaces.py, display human friendly description of some UPnP service

System (system/):

fdpass, pass a file descriptor over STDOUT
seccompstuff/nonetwork, disable networking system calls using seccomp-bpf
procdump, dump a process memory without stopping it
socket-activate, systemd-style socket activation (like systemd-socket-activate)

Interaction with known web sites/services (websites/):

github-api, CLI for Github API

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dnsfwd's Issues

dnsfwd shutdown after running for a while

So far, dnsfwd has shut down with two different errors, IF it has answered dns queries:

dnsfwd --bind-udp 127.0.0.1:9999 --connect-tcp 127.0.0.1:53
<2>shutdown: Socket is not connected

dnsfwd --bind-udp 127.0.0.1:9999 --connect-tcp 127.0.0.1:53 --logformat human --loglevel 5
CRIT: shutdown: Socket is not connected

It had managed to stay up for hours, when no query was thrown at it.

Dies when connection fails

When the connection attempt to the upstream DNS server fails, the process dies with:

<2>connect: Connection refused

error: use of undeclared identifier 'SO_DOMAIN'

Getting the following during make on macOS (OS X / Darwin):

/dnsfwd/src/dnsfwd.hpp:137:7: warning: suggest braces around initialization of subobject [-Wmissing-braces]
boost::asio::buffer( &network_size_, sizeof(network_size_) ),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/dnsfwd/src/server.cpp:48:34: error: use of undeclared identifier 'SO_DOMAIN'
if (getsockopt(fd, SOL_SOCKET, SO_DOMAIN, &domain, &len) != 0) {
^
/dnsfwd/src/server.cpp:60:34: error: use of undeclared identifier 'SO_PROTOCOL'
if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &protocol, &len) != 0) {
^
1 warning and 2 errors generated.
make[2]: *** [CMakeFiles/dnsfwd.dir/src/server.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
In file included from /dnsfwd/src/service.cpp:24:
/dnsfwd/src/dnsfwd.hpp:137:7: warning: suggest braces around initialization of subobject [-Wmissing-braces]
boost::asio::buffer( &network_size_, sizeof(network_size_) ),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Supposedly, SO_DOMAIN is Linux only and SO_PROTOCOL is not defined on OS X and platform-dependent:
https://trac.torproject.org/projects/tor/ticket/13571
http://archives.seul.org/tor/bugs/Oct-2014/msg01489.html
http://tor-dev.torproject.narkive.com/sBOppDHG/torsocks-2-0-0-rc1-release
dgoulet/torsocks@1e4e20b

https://stackoverflow.com/questions/24418930/os-x-getsockopt-no-so-protocol

I realize this is prototype project written on Linux. It would be nice to be able to built and use it on non-Linux BSD-like platforms such OS X, since the project is the implementation of a great concept.

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