aly / txtrecord_decode.py

#!/usr/bin/env python3 # txtrecord_decode.py output.png logo.example.com import dns.resolver # pip3 install dnspython import base64 import sys def parse_records(name): _next = "" print("{}".format(name), file=sys.stderr) q = dns.resolver.query(name,"TXT").response.answer[0] out = b"" for line in sorted(_.strings[0] for _ in q): if chr(line[0]) == "{": if chr(line[1]) == "n": _next = line.split(b"}",1)[1].decode("utf-8") continue try: out += line.split(b"}",1)[1] except IndexError: pass return out, _next out = b"" name = sys.argv[2] while True: next_out, name = parse_records(name) out += next_out if not name: break with open(sys.argv[1],"wb") as f: f.write(base64.b64decode(out))

#!/usr/bin/env python3 # txtrecord_encode.py input.png logo.example.com import base64 import sys from textwrap import wrap with open(sys.argv[1],"rb") as f: enc = base64.b64encode(f.read()).decode("utf-8") # '%04d' and '247' may need to be updated for large files to ensure the line count doesn't push the length # longer than 255 bytes tot = len(enc) tmp = 0 for n,block in enumerate(wrap(enc,65000)): tmp += len(block) print("\n".join("{0}. IN TXT '{1}{2}'".format((str(n) if n else "") + sys.argv[2], "{%03d}" % _n, s) for _n, s in enumerate(wrap(block,249)))) if tmp != tot: print("{0}. IN TXT '{1}{2}.".format((str(n) if n else "") + sys.argv[2], "{nxt}", str(n+1) + sys.argv[2])) #print("\n".join("%s. IN TXT '{%03d}%s'" % (sys.argv[2], n,s) for n,s in enumerate(wrap(enc,249))))

{ "cells": [ { "cell_type": "markdown", "metadata": {}, "source": [ "This is a test of Jupyter generating a cool blog post about a neat python project or something." ] }, { "cell_type": "code", "execution_count": 10, "metadata": {}, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ "b'test'\n", "b'{00}iVBORw0KGgoAAAAN...sQo8aFRo0+M8YCYKGjiE'\n", "b'{01}Q1CiALGgCAgINfud...ZGAkyJ9sDvO2DzNa4dZk'\n", "b'{02}E+BTF9RgIePCSjO3...UX6911GGr69VMh/3eWDV'\n", "b'{03}bE6tkPWUyTPRkqrY...bw8nGGgoCoYXopEPQ1Q7'\n" ] } ], "source": [ "import dns.resolver\n", "import base64\n", "from IPython.display import HTML\n", "q = dns.resolver.query(\"logo.hosttel.com.au\",\"TXT\").response.answer[0]\n", "for line in sorted(_.strings[0] for _ in q)[:5]:\n", " print((line[:20] + b\"...\" + line[-20:]) if len(line) > 20 else line)" ] }, { "cell_type": "code", "execution_count": 3, "metadata": {}, "outputs": [ { "data": { "text/html": [ "<img 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'/>" ], "text/plain": [ "<IPython.core.display.HTML object>" ] }, "execution_count": 3, "metadata": {}, "output_type": "execute_result" } ], "source": [ "out = b\"\"\n", "for line in sorted(_.strings[0] for _ in q):\n", " if chr(line[0]) == \"{\":\n", " try:\n", " out += line.split(b\"}\",1)[1]\n", " except IndexError:\n", " pass\n", "HTML(\"<img src='data:image/png;base64,{0}'/>\".format(out.decode('utf-8')))" ] } ], "metadata": { "kernelspec": { "display_name": "Python 3", "language": "python", "name": "python3" }, "language_info": { "codemirror_mode": { "name": "ipython", "version": 3 }, "file_extension": ".py", "mimetype": "text/x-python", "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", "version": "3.7.3" } }, "nbformat": 4, "nbformat_minor": 2 }