From 1e7883269f6f5ba61c9fc618d418b484916aba7f Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Mon, 6 Apr 2020 11:46:37 +0200
Subject: sshban: allow using SIGUSR1 to dump current state to log

---
 sshban.py | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/sshban.py b/sshban.py
index 8d160f5..926ec95 100755
--- a/sshban.py
+++ b/sshban.py
@@ -6,6 +6,7 @@ import logging.handlers
 import os
 import re
 import select
+import signal
 import shlex
 import sys
 import subprocess
@@ -59,6 +60,14 @@ class ExpiringCounter:
         self._data = {}
         self.default_timeout = default_timeout
 
+    def __str__(self):
+        now = self._now()
+        ret = ''
+        for key, (ts, count) in self._data.items():
+            ret += '%s(%d): %gs, %gs remaining\n' % (key, count, now - ts, self.default_timeout - (now - ts))
+
+        return ret
+
     def __contains__(self, key):
         if not key in self._data:
             return False
@@ -143,6 +152,14 @@ class Judge:
 
         return ACT_NOTHING
 
+    def __str__(self):
+        ret = 'Judge:\n  wl: %s\n  gl: %s\n' % (str(self._whitelist), str(self._graylist))
+
+        for key, val in self._blacklists.items():
+            ret += '  bl %s: %s\n' % (key, str(val))
+
+        return ret
+
 parser = argparse.ArgumentParser('Parse logs and ban SSH abusers')
 
 parser.add_argument('-s', '--thresh-short', type = int, default = 8,
@@ -186,6 +203,13 @@ sys.excepthook = excepthook
 
 judge = Judge({ ACT_BAN_SHORT : args.thresh_short, ACT_BAN_MEDIUM : args.thresh_medium, ACT_BAN_LONG : args.thresh_long })
 
+# use SIGUSR1 to print state
+def log_state(sig, stack):
+    state = str(judge).splitlines()
+    for l in state:
+        logger.info(l)
+signal.signal(signal.SIGUSR1, log_state)
+
 # open FIFO read-write so poll() won't return HUP endlessly if the writer dies
 fifofd = os.open(args.inputfifo, os.O_RDWR | os.O_NONBLOCK)
 with open(fifofd) as fifo:
-- 
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