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checkmyip/checkmyip.py

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#!/usr/local/bin/python3.9
##### BSD Cafe CheckMyIP Server #####
##### Originally written by John W Kerns #####
##### http://blog.packetsar.com #####
##### Forked to BSD Cafe by Stefano Marinelli #####
##### https://brew.bsd.cafe/BSDCafe/checkmyip #####
##### Inform version here #####
version = "v1.3.0"
##### Import python2 native modules #####
import os
import sys
import time
import socket
import json
import jinja2
import paramiko
import threading
from dnslib import DNSRecord, DNSHeader, RR, TXT, QTYPE
##### Jinja formatting for logging queries #####
j2log = "Connection from: {{ ip }} ({{ port }}) ({{ proto }})"
##### Jinja formatting for response queries #####
j2send = """{
"comment": "## Your IP Address is {{ ip }} ({{ port }}) ##",
"family": "{{ family }}",
"ip": "{{ ip }}",
"port": "{{ port }}",
"protocol": "{{ proto }}",
"version": "%s",
"website": "https://brew.bsd.cafe/BSDCafe/checkmyip",
"sponsor": "Served by BSD Cafe, https://bsd.cafe/"
}""" % version
##### DNS Server Functionality #####
class DNSResponder:
def __init__(self, address='::', port=5553):
self.address = address
self.port = port
self.sock = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
self.sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 0) # Enables dual-stack mode
self.sock.bind((self.address, self.port))
def run(self):
print("DNS Server listening on port 53 for both IPv4 and IPv6")
while True:
data, addr = self.sock.recvfrom(1024)
threading.Thread(target=self.handle_query, args=(data, addr)).start()
def handle_query(self, data, addr):
try:
request = DNSRecord.parse(data)
qname = request.q.qname
qtype = request.q.qtype
ip, port, *_ = addr # Get IP and port; ignore other details
# Normalize IPv6 address (remove IPv4 mapping if exists)
if ip.startswith("::ffff:"):
ip = ip[7:]
# Only respond to TXT queries for myip.bsd.cafe
if qname.matchGlob('myip.bsd.cafe') and qtype == QTYPE.TXT:
response = DNSRecord(DNSHeader(id=request.header.id, qr=1, aa=1, ra=1), q=request.q)
response.add_answer(RR(qname, QTYPE.TXT, ttl=60, rdata=TXT(ip)))
self.sock.sendto(response.pack(), addr)
except Exception as e:
print(f"Error handling DNS query: {e}")
##### Handles all prnting to console and logging to the logfile #####
class log_management:
def __init__(self):
self.logpath = "/var/log/checkmyip/" # Log file directory path
self.logfile = "/var/log/checkmyip/%scheckmyip.log" % \
time.strftime("%Y-%m-%d_") # Log file full path
self.paramikolog = "/var/log/checkmyip/%sssh.log" % \
time.strftime("%Y-%m-%d_") # SSH log file path
self.thread = threading.Thread(target=self._change_logfiles)
self.thread.daemon = True
self.thread.start() # Start talker thread to listen to port
self._publish_methods() # Publish the console and log methods to glob
self.can_log = True # Variable used to check if we can log
try: # Try to configure the SSH log file, create dir if fail
paramiko.util.log_to_file(self.paramikolog)
except IOError:
self._create_log_dir()
def _logger(self, data): # Logging method published to global as 'log'
logdata = time.strftime("%Y-%m-%d %H:%M:%S") + ": " + data + "\n"
if self.can_log:
try: # Try to write to log, create log dir if fail
f = open(self.logfile, 'a')
f.write(logdata)
f.close()
except IOError:
self._console("Unable to log to logfile %s. Creating log directory" % self.logfile)
self.can_log = False
self._create_log_dir()
self._console(logdata)
def _console(self, data, timestamp=False):
if timestamp:
logdata = time.strftime("%Y-%m-%d %H:%M:%S") + ": " + data + "\n"
else:
logdata = data
print(logdata)
def _publish_methods(self):
global log
global console
log = self._logger # Global method used to write to the log file
console = self._console # Global method used to write to the console
def _create_log_dir(self): # Create the directory for logging
os.system('mkdir -p ' + self.logpath)
self._console("Logpath (%s) created" % self.logpath)
self.can_log = True
def _change_logfiles(self, thread=True):
while True:
time.sleep(10)
self.logfile = "/var/log/checkmyip/%scheckmyip.log" % \
time.strftime("%Y-%m-%d_") # Log file full path
self.paramikolog = "/var/log/checkmyip/%sssh.log" % \
time.strftime("%Y-%m-%d_") # SSH log file path
paramiko.util.log_to_file(self.paramikolog)
##### Creates a RSA key for use by paramiko #####
class rsa_key:
data = """-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
"""
def readlines(self): # For use by paramiko.RSAKey.from_private_key mthd
return self.data.split("\n")
def __call__(self): # Recursive method uses own object as arg when called
return paramiko.RSAKey.from_private_key(self)
##### Imports and modifies the ServerInterface module for use by paramiko #####
class ssh_server (paramiko.ServerInterface):
def __init__(self):
self.event = threading.Event()
def check_channel_request(self, kind, chanid):
if kind == 'session':
return paramiko.OPEN_SUCCEEDED
return paramiko.OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED
def check_auth_none(self, username): # Auth none method left wide open
return paramiko.AUTH_SUCCESSFUL
def get_allowed_auths(self, username): # Give no auth options
return 'none'
def check_channel_shell_request(self, channel):
self.event.set()
return True
def check_channel_pty_request(self, channel, term, width, height,
pixelwidth, pixelheight, modes):
return True
##### Method to merge Jinja templates #####
def j2format(j2tmp, valdict):
template = jinja2.Template(j2tmp)
return template.render(valdict).replace("\n", "\r\n")
##### Cleans IP addresses coming from socket library #####
def cleanip(addr):
ip, port = addr[:2]
family = "ipv6" # Default to IPv6
if ip.startswith("::ffff:"): # Check if this is a prefixed IPv4 address
ip = ip.replace("::ffff:", "") # Clean the IP
family = "ipv4"
elif ":" not in ip: # Simple check to recognize IPv4
family = "ipv4"
return ip, port, family # Return cleaned IP and family
##### TCP listener methods. Gets used once for each listening port #####
def listener(port, talker):
listen_ip = ''
listen_port = port
buffer_size = 1024
while True:
# Use AF_INET6 but also handle IPv4 connections
sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 0) # Allow IPv4-mapped IPv6 addresses
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind((listen_ip, listen_port))
sock.listen(buffer_size)
while True:
client, addr = sock.accept()
ip, port, family = cleanip(addr) # Get cleaned IP info including family
valdict = {"ip": ip, "port": port, "family": family, "proto": ""}
thread = threading.Thread(target=talker, args=(client, valdict))
thread.start() # Start talker thread to listen to port
##### Telnet responder method. Is run in own thread for each telnet query #####
def telnet_talker(client, valdict, proto="telnet"):
valdict.update({"proto": proto}) # Add the protocol to the value dict
log(j2format(j2log, valdict)) # Log the query to the console and logfile
# Send the query response
client.send(f'{j2format(j2send, valdict)}\n'.encode())
client.close() # Close the channel
##### SSH responder method. Gets run in own thread for each SSH query #####
def ssh_talker(client, valdict, proto="ssh"):
def makefile(): # A hack to make Cisco SSH sessions work properly
chan.makefile('rU').readline().strip('\r\n')
valdict.update({"proto": proto})
log(j2format(j2log, valdict))
t = paramiko.Transport(client, gss_kex=True)
t.set_gss_host(socket.getfqdn(""))
t.load_server_moduli()
t.add_server_key(rsa_key()()) # RSA key object nested call
server = ssh_server()
t.start_server(server=server)
chan = t.accept(20)
if chan:
server.event.wait(10)
chan.send('%s\n' % j2format(j2send, valdict)) # Send the response
thread = threading.Thread(target=makefile)
thread.start() # Start hack in thread since it hangs indefinately
time.sleep(1) # Wait a second
chan.close() # And kill the SSH channel
client.close() # And kill the session
##### HTTP responder method. Gets run in own thread for each HTTP query #####
##### Automatically detects if client is a browser or a telnet client #####
##### HTTP responder method. Gets run in own thread for each HTTP query #####
def http_talker(client, valdict, proto="http"):
time.sleep(.1) # Sleep to allow the client to send some data
client.setblocking(0) # Set the socket recv as non-blocking
browser = False # Is the client using a browser?
headers = {}
try:
data = client.recv(2048) # Receive data from the buffer (if any)
request_lines = data.decode().split('\r\n')
for line in request_lines:
if ": " in line:
key, value = line.split(": ", 1)
headers[key] = value
# Extract real IP and adjust family based on headers if present
if 'X-Real-IP' in headers or 'X-Forwarded-For' in headers:
real_ip = headers.get('X-Real-IP', headers.get('X-Forwarded-For').split(',')[0])
ip, port, family = cleanip((real_ip, valdict['port']))
valdict.update({"ip": ip, "family": family})
browser = True # Set client browser to True
except socket.error: # If buffer was empty, then like a telnet client on TCP80
browser = False # Set client browser to False
if not browser: # If the client is not a browser
telnet_talker(client, valdict, "http-telnet") # Hand to telnet_talker
else: # If client is a browser
# Proceed with standard HTTP response (with headers)
valdict.update({"proto": proto})
log(j2format(j2log, valdict))
response_body_raw = j2format(j2send, valdict)+"\n"
if request_lines[0].split()[1] == "/raw":
json_content = json.loads(response_body_raw)
response_body_raw = json_content['ip']
response_headers_raw = """HTTP/1.1 200 OK
Content-Length: %s
Content-Type: application/json; encoding=utf8
Connection: close""" % str(len(response_body_raw)) # Response with headers
client.send(f'{response_headers_raw}\n\n{response_body_raw}'.encode())
client.close()
##### Server startup method. Starts a listener thread for each TCP port #####
def start():
talkers = {2222: ssh_talker, 2223: telnet_talker,
2280: http_talker} # Three listeners on different ports
for talker in talkers:
# Launch a thread for each listener
thread = threading.Thread(target=listener,
args=(talker, talkers[talker]))
thread.daemon = True
thread.start()
# Start DNS server in a new thread
dns_server = DNSResponder()
dns_thread = threading.Thread(target=dns_server.run)
dns_thread.daemon = True
dns_thread.start()
while True: # While loop to allow a CTRL-C interrupt when interactive
try:
time.sleep(1)
except KeyboardInterrupt:
quit()
##### Client class to be used to make API calls to CheckMyIP server #####
class CheckMyIP_Client:
def __init__(self):
self._json = __import__('json') # Import the JSON library
self._socket = __import__('socket') # Import the socket library
self._raw_data = None # Initialize the _raw_data variable
self._data = None # Initialize the _data variable
self._af = "auto" # Set the IP address family type to "auto"
self.server = "telnetmyip.com" # Set the default CheckMyIP server
def get(self): # Primary method to run IP check
if self._af == "auto": # If we are using an auto address family
try: # Try using IPv6
sock = self._socket.socket(self._socket.AF_INET6,
self._socket.SOCK_STREAM)
sock.connect((self.server, 23))
except: # Fall back to IPv4 if IPv6 fails
sock = self._socket.socket(self._socket.AF_INET,
self._socket.SOCK_STREAM)
sock.connect((self.server, 23))
elif self._af == "ipv6": # If we are using the IPv6 address family
sock = self._socket.socket(self._socket.AF_INET6,
self._socket.SOCK_STREAM)
sock.connect((self.server, 23))
elif self._af == "ipv4": # If we are using the IPv4 address family
sock = self._socket.socket(self._socket.AF_INET,
self._socket.SOCK_STREAM)
sock.connect((self.server, 23))
self._raw_data = sock.recv(1024).decode()
self._data = self._json.loads(self._raw_data) # Recieve data from the buffer
sock.close() # Close the socket
return self._data # Return the JSON data
def set_family(self, family): # Method to set the IP address family
allowed = ["auto", "ipv4", "ipv6"] # Allowed input values
if family in allowed:
self._af = family
else:
raise Exception("Allowed families are 'auto', 'ipv4', 'ipv6'")
### CheckMyIP_Client Example Usage ###
#client = CheckMyIP_Client()
#client.get()
if __name__ == "__main__":
logging = log_management() # Instantiate log class
start() # Start the server
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