From 0d47952611198ef6b1163f366dc03922d20b1475 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 09:42:04 +0200
Subject: Adding upstream version 7.94+git20230807.3be01efb1+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 ncat/scripts/p0fme.py | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100755 ncat/scripts/p0fme.py

(limited to 'ncat/scripts/p0fme.py')

diff --git a/ncat/scripts/p0fme.py b/ncat/scripts/p0fme.py
new file mode 100755
index 0000000..5f4d42e
--- /dev/null
+++ b/ncat/scripts/p0fme.py
@@ -0,0 +1,97 @@
+#!/usr/bin/python
+
+from __future__ import print_function  # logging, python2-only.
+
+"""
+A script that reads data generated by p0f -f p0f.log, looking for all entries
+about an IP read from NCAT_REMOTE_ADDR environment variable. Then it prints out
+all the information it has found. To try it out, run "p0f -i any -o p0f.log"
+and ncat -l -k --sh-exec "python p0fme.py".
+
+Script tested under Python versions 2.7 and 3.3.
+"""
+
+P0F_LOG_FILE = "p0f.log"
+
+import datetime  # logging
+import sys  # logging
+import os  # environ
+import time  # sleeping to wait for data
+import sys  # to flush STDOUT
+
+
+def expand_ipv6(ip):
+    """
+    Expands short IPv6 address like ::1 into an expanded form without trailing
+    zeros. Copied from:
+
+    http://svn.python.org/projects/python/tags/r31b1/Lib/ipaddr.py
+
+    (Py3 standard library; added some modifications to match p0f's output data)
+    """
+
+    new_ip = []
+    hextet = ip.split('::')
+    sep = len(hextet[0].split(':')) + len(hextet[1].split(':'))
+    new_ip = hextet[0].split(':')
+
+    for _ in range(8 - sep):
+        new_ip.append('0')
+    new_ip += hextet[1].split(':')
+
+    # Now need to make sure every hextet is 4 lower case characters.
+    # If a hextet is < 4 characters, we've got missing leading 0's.
+    ret_ip = []
+    for hextet in new_ip:
+        if hextet == '':
+                hextet = '0'
+        ret_ip.append(hextet.lower())
+    return ':'.join(ret_ip)
+
+
+def split_by_equals(str_):
+    ret = str_.split('=')
+    return ret[0], ''.join(ret[1:])
+
+if __name__ == "__main__":
+    try:
+        ip = os.environ['NCAT_REMOTE_ADDR']
+        if os.environ['NCAT_PROTO'] != 'TCP':
+            sys.exit("ERROR: This script works for TCP servers only!")
+    except KeyError:
+        sys.exit("ERROR: This script has to be run from inside of Ncat.")
+    print("[%s] Got a request from %s" % (
+        datetime.datetime.now().isoformat(' '), ip), file=sys.stderr)
+
+    print("Hold on, I'm collecting data on you...")
+    sys.stdout.flush()
+    time.sleep(3.0)
+
+    if ':' in ip:  # We need to expand IPv6 addresses in a specific way.
+            ip = expand_ipv6(ip)
+    result = {}
+
+    # Reading the log backward will give us more recent results.
+    for line in reversed(open(P0F_LOG_FILE).readlines()):
+
+        without_date = line.split('] ')
+        if without_date == ['\n']:
+            continue
+        without_date = ''.join(without_date[1:])
+
+        # Create a key-value dictionary out of the '|'-separated substrings.
+        properties = dict(map(split_by_equals, without_date.split('|')))
+
+        if not properties['cli'].startswith(ip):
+            continue  # Not the IP we're looking for, check next one.
+
+        for key in properties:
+            if not key in result or result[key] == '???':
+                result[key] = properties[key]
+
+    if not result:
+        print("Got nothing on you. Try again and I will, though.")
+
+    # Now that we've finished, print out the results.
+    for key in sorted(result):
+        print("%s: %s" % (key, result[key].rstrip()))
-- 
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