POST Form Data with Curl
curl -X POST https://reqbin.com/echo/post/form -H "Content-Type: application/x-www-form-urlencoded" -d "param1=value1¶m2=value2"
References
https://reqbin.com/req/c-sma2qrvp/curl-post-form-example
Compile a PyQt Windowed file to a single standalone executable file using PyInstaller
pyinstaller.exe --onefile --windowed app.py
Create a Linux Swap File
sudo fallocate -l 1G /swapfile
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
To make the change permanent open the /etc/fstab file and append the following line:
/swapfile swap swap defaults 0 0
sudo swapon --show
sudo free -h
References
https://linuxize.com/post/create-a-linux-swap-file/
Installing dnscrypt-proxy on Linux
Get a root shell
sudo -s
check what else is possibly already listening to port 53
ss -lp 'sport = :domain'
systemctl stop systemd-resolved systemctl disable systemd-resolved
ss -lp 'sport = :domain'
Download and run dnscrypt-proxy
Download dnscrypt-proxy here: dnscrypt-proxy binaries.
cp example-dnscrypt-proxy.toml dnscrypt-proxy.toml
./dnscrypt-proxy
Change the system DNS settings
apt-get remove resolvconf
cp /etc/resolv.conf /etc/resolv.conf.backup
rm -f /etc/resolv.conf
And create a new /etc/resolv.conf file with the following content:
nameserver 127.0.0.1 options edns0
Install the proxy as a system service
./dnscrypt-proxy -service install
./dnscrypt-proxy -service start
./dnscrypt-proxy -service stop
./dnscrypt-proxy -service restart
./dnscrypt-proxy -service uninstall
Want to check that DNS resolution works?
./dnscrypt-proxy -resolve example.com
Connect to 1.1.1.1 using DoH clients
Add cloudflare and cloudflare-ipv6 to the server list in dnscrypt-proxy.toml:
server_names = ['cloudflare', 'cloudflare-ipv6']
References
https://github.com/DNSCrypt/dnscrypt-proxy/wiki/Installation-linux
https://developers.cloudflare.com/1.1.1.1/encryption/dns-over-https/dns-over-https-client/
Prettifying a JSON String in .NET using Json.NET
string jsonFormatted = JValue.Parse(json).ToString(Formatting.Indented);
string jsonFormatted = JToken.Parse(json).ToString(Formatting.Indented);
References
https://weblog.west-wind.com/posts/2015/mar/31/prettifying-a-json-string-in-net
https://stackoverflow.com/questions/54816674/how-to-write-a-json-file-in-pretty-format-using-net
Linux Host File
The hosts file is a way to map hostnames to IP addresses. This is very important with certain setups and to make networking on Linux a bit easier. In a sense, the hosts file acts as a local DNS server.
sudo nano /etc/hosts
For example, to block Wikipedia, you’d type (remembering to use the Tab key rather than Space):
127.0.0.1 wikipedia.org
or static dns lookup for hostnames
198.20.14.51 example.com
References
https://www.makeuseof.com/tag/modify-manage-hosts-file-linux/
NTFS file system read-only by Ubuntu
The reason is if you “shutdown” does not actually shut down most of the time in Windows, but only hibernates.
Unmount the Ntfs partition by running
sudo umount -a
to get the partition to mount with full read/write access
sudo ntfsfix /dev/sdaxx #(for example /dev/sda3)
References
https://superuser.com/questions/1394263/ntfs-file-system-read-only-by-ubuntu-remount-doesnt-work
Get all IPs of a domain in Windows
PowerShell :
[System.Net.Dns]::GetHostEntry('google.com').AddressList.IPAddressToString
References
https://www.kjctech.net/powershell-tip-how-to-get-all-ips-assigned-to-a-dns-domain/
Get all IPs of a domain in Linux
dig a google.com
dig a google.com +short @8.8.8.8
References
https://superuser.com/questions/152576/how-to-get-all-ips-of-a-domain
https://superuser.com/questions/847575/how-do-i-find-all-known-ips-for-a-given-domain-in-linux
Clear DNS cache on Windows
You can force a flush of all cached DNS records using the following command:
ipconfig /flushdns
a list of all the records in your cache along with their TTL by executing the following command at the command prompt:
ipconfig /displaydns
References
https://superuser.com/questions/80744/how-often-does-the-dns-cache-clear