1st step
base64 is not an encryption, but an encoding. If you are working on
Linux or other Unix-variants, the command base64, base64-encoder/decoder,
will be pre-installed. If not, it will be easily installed with your
OS-dependent package manager.
Then please try to execute:
base64 -d <<< "MTg1LjExNC4xMzcuMTQ="
It will output:
185.114.137.14
2nd step
Then we can combine the base64 decoder with your command pipeline.
The problem is base64-coding ignores newlines and we need to process
the result of the pipeline line by line. Assuming the variable $output
holds the output of the wget command, please try:
while IFS= read -r line; do
base64 -d <<< "$line"
echo
done < <(echo "$output" | grep -Eo '("[A-Za-z0-9]{12,30}[=]{0,2}")' | cut -d '"' -f2)
It will print something like:
185.114.137.14
161.97.138.238
The <(command) notation is a process substitution and the output of
echo .. grep .. cut pipeline is fed to the while loop via stdin
and the while loop processes the base64-encoded strings line by line.
3rd step
Now we want to merge the IPs and PORTs in a format of IP:PORT.
We can make use of paste command. The final script will be:
paste -d ":" <(
while IFS= read -r line; do
base64 -d <<< "$line"
echo
done < <(echo "$output" | grep -Eo '("[A-Za-z0-9]{12,30}[=]{0,2}")' | cut -d '"' -f2)
)
<(echo "$output" | grep -Eo "(class="fport" style=''>[0-9]{1,9})" | cut -d '>' -f2)
Output:
185.114.137.14:12195
161.97.138.238:3128
The paste command takes filenames as arguments. Here we make use
of process substitution again in a manner as: paste <(command1) <(command2)
which saves to create temporary files.
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