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#!/usr/bin/env python3
"""
AIS JSON to NMEA Encoder

This CLI application encodes JSON-formatted AIS (Automatic Identification System) data into NMEA sentences.
It reads JSON from stdin and outputs encoded NMEA AIS messages to stdout.

The encoder supports multiple input modes:
- Single JSON object
- Line-delimited JSON (one object per line)

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# Basic HMAC-based One-Time Password Algorithm in Python
# Based on RFC 4226 and RFC 6238
import base64
import datetime
import hashlib
import struct
import time


def dt(hmac_result: bytes) -> int:

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import ctypes
import os
import sys

buffer = bytearray(1_000_000)

vaddr = ctypes.addressof(ctypes.c_char.from_buffer(buffer))

print(f'Allocated an array of {len(buffer)} bytes at 0x{vaddr:x}.')

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#!/usr/bin/env python3
# sudo sysctl -w kernel.apparmor_restrict_unprivileged_unconfined=0
# sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0
# unshare --user --map-user=0

from dataclasses import dataclass
import fcntl
import getpass
import multiprocessing
import os

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import pathlib
import re
import os
import functools

def _translate(pat, STAR, QUESTION_MARK):
    res = []
    add = res.append
    i, n = 0, len(pat)
    while i < n:

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import ctypes
import select
import pathlib

from ctypes import c_char_p, c_int, c_uint32
import os


class EventStruct(ctypes.Structure):

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#!/bin/env python3
"""This is a simple self-contained script to reload an arbitrary application
when its source changes (like using Flask in debug mode). It comes without
any 3rd party dependencies and can run standalone - a copy of this script is
all you need.

Examples:
    ./autostart.py -p '*.py' -i 'venv/*' flake8 autostart.py --max-line-length 120
    ./autostart.py -p '*.py' -i 'venv/*' mypy ./autostart.py
    ./autostart.py -p '*.py' -i 'venv/*' "$(which python3)" ./server.py

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NAT Traversal Setup with Netcat

This guide demonstrates a simple NAT traversal setup using tcpdump and nc (Netcat) for UDP communication.

Step 1: Monitor UDP Request on the Server

On the server, use tcpdump to monitor the incoming UDP packets on port 12345:

sudo tcpdump -i any udp and port 12345

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UDP Hole Punching

The following example demonstrates how to punch a hole through a stateful firewall using UDP. It opens a reverse shell on the server.

⚠️ Using reverse or bind shells can be highly insecure and potentially illegal if executed without authorization. Always ensure you have explicit permission before performing such actions in a network.

Assumptions

• Server: The target machine on which the shell will be opened.
• Client: The machine used to remotely connect to the shell.

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import pathlib

import pyais
from pyais.tracker import AISTrackEvent


def do_something(track):
    # called every time an AISTrack is created or updated
    print(track.mmsi, track)