--- /dev/null
+#!/usr/bin/python3
+#
+# Reads log files from tinydns and/or dnscache and prints them out in
+# human-readable form. Logs can be supplied on stdin, or listed on the
+# command line:
+#
+# $ cat @*.s | djbdns-logparse
+# $ djbdns-logparse @*.s
+# $ tail -f current | djbdns-logparse
+#
+# Pipes each log file through tai64nlocal, which must be on your path.
+#
+# Acknowledgments:
+#
+# * The log format descriptions by Rob Mayoff were invaluable:
+# ** http://dqd.com/~mayoff/notes/djbdns/tinydns-log.html
+# ** http://dqd.com/~mayoff/notes/djbdns/dnscache-log.html
+#
+# * Faried Nawaz's dnscache log parser was the original inspiration:
+# ** http://www.hungry.com/~fn/dnscache-log.pl.txt
+#
+
+import sys, re
+from struct import pack
+from time import strftime, gmtime
+from subprocess import Popen, PIPE
+
+# common components of line-matching regexes
+timestamp_pat = r'[\d-]+ [\d:\.]+' # output of tai64nlocal
+hex4_pat = r'[0-9a-f]{4}'
+ip_pat = r'[0-9a-f]{8,32}' # IPv4 or IPv6 addresses in hex
+
+# discriminate between dnscache and tinydns log lines
+tinydns_log_re = re.compile(
+ r'(%s) (%s):(%s):(%s) ([\+\-IC/]) (%s) (.*)'
+ % (timestamp_pat, ip_pat, hex4_pat, hex4_pat, hex4_pat))
+dnscache_log_re = re.compile(r'(%s) (\w+)(.*)' % timestamp_pat)
+
+query_type = {
+ 1: "a",
+ 2: "ns",
+ 5: "cname",
+ 6: "soa",
+ 12: "ptr",
+ 13: "hinfo",
+ 15: "mx",
+ 16: "txt",
+ 17: "rp",
+ 24: "sig",
+ 25: "key",
+ 28: "aaaa",
+ 38: "a6",
+ 252: "axfr",
+ 255: "any",
+}
+
+# for tinydns only
+query_drop_reason = {
+ "-": "no authority",
+ "I": "invalid query",
+ "C": "invalid class",
+ }
+
+
+def warn(filename, msg):
+ sys.stderr.write("warning: %s: %s\n" % (filename, msg))
+
+def convert_ip(ip):
+ """Convert a hex string representing an IP address to conventional
+ human-readable form, ie. dotted-quad decimal for IPv4, and
+ 8 colon-separated hex shorts for IPv6.
+ """
+ if len(ip) == 8:
+ # IPv4, eg. "7f000001" -> "127.0.0.1"
+ return "%d.%d.%d.%d" % tuple(pack(">L", int(ip, 16)))
+ elif len(ip) == 32:
+ # IPv6 is actually simpler -- it's just a string-slicing operation,
+ # eg. "00000000000000000000ffff7f000001" ->
+ # "0000:0000:0000:0000:0000:ffff:7f00:0001"
+ return ":".join([ip[(4*i) : (4*i+4)] for i in range(8)])
+
+
+def _cvt_ip(match):
+ return convert_ip(match.group(1))
+
+def _cvt_port(match):
+ return ":" + str(int(match.group(1), 16))
+
+def decode_client(words, i):
+ chunks = words[i].split(":")
+ if len(chunks) == 2: # ip:port
+ words[i] = "%s:%d" % (convert_ip(chunks[0]), int(chunks[1], 16))
+ elif len(chunks) == 3:
+ words[i] = "%s:%d (id %d)" % (convert_ip(chunks[0]),
+ int(chunks[1], 16),
+ int(chunks[2], 16))
+
+def decode_ip(words, i):
+ words[i] = convert_ip(words[i])
+
+def decode_ttl(words, i):
+ words[i] = "TTL=%s" % words[i]
+
+def decode_serial(words, i):
+ serial = int(words[i])
+ words[i] = "#%d" % serial
+
+def decode_type(words, i):
+ qt = words[i]
+ words[i] = query_type.get(int(qt), qt)
+
+def handle_dnscache_log(line, match):
+ (timestamp, event, data) = match.groups()
+
+ words = data.split()
+ if event == "cached":
+ if words[0] not in ("cname", "ns", "nxdomain"):
+ decode_type(words, 0)
+
+ elif event == "drop":
+ decode_serial(words, 0)
+
+ elif event == "lame":
+ decode_ip(words, 0)
+
+ elif event == "nodata":
+ decode_ip(words, 0)
+ decode_ttl(words, 1)
+ decode_type(words, 2)
+
+ elif event == "nxdomain":
+ decode_ip(words, 0)
+ decode_ttl(words, 1)
+
+ elif event == "query":
+ decode_serial(words, 0)
+ decode_client(words, 1)
+ decode_type(words, 2)
+
+ elif event == "rr":
+ decode_ip(words, 0)
+ decode_ttl(words, 1)
+ if words[2] not in ("cname", "mx", "ns", "ptr", "soa"):
+ decode_type(words, 2)
+ if words[2] == "a": # decode answer to an A query
+ decode_ip(words, 4)
+ if words[2] == "txt": # text record
+ response = words[4]
+ if response.endswith("..."):
+ ellipsis = "..."
+ response = response[0:-3]
+ else:
+ ellipsis = ""
+ length = int(response[0:2], 16)
+ chars = []
+ for i in range(1, len(response)/2):
+ chars.append(chr(int(response[2*i : (2*i)+2], 16)))
+ words[4] = "%d:\"%s%s\"" % (length, "".join(chars), ellipsis)
+
+ elif event == "sent":
+ decode_serial(words, 0)
+
+ elif event == "stats":
+ words[0] = "count=%s" % words[0]
+ words[1] = "motion=%s" % words[1]
+ words[2] = "udp-active=%s" % words[2]
+ words[3] = "tcp-active=%s" % words[3]
+
+ elif event == "tx":
+ words[0] = "g=%s" % words[0]
+ decode_type(words, 1)
+ # words[2] = name
+ # words[3] = control (domain for which these servers are believed
+ # to be authoritative)
+ for i in range(4, len(words)):
+ decode_ip(words, i)
+
+ elif event in ("tcpopen", "tcpclose"):
+ decode_client(words, 0)
+
+ print(timestamp, event, " ".join(words))
+
+
+def handle_tinydns_log(line, match):
+ (timestamp, ip, port, id, code, type, name) = match.groups()
+ ip = convert_ip(ip)
+ port = int(port, 16)
+ id = int(id, 16)
+ type = int(type, 16) # "001c" -> 28
+ type = query_type.get(type, type) # 28 -> "aaaa"
+
+ print(timestamp,)
+
+ if code == "+":
+ print ("sent response to %s:%s (id %s): %s %s"
+ % (ip, port, id, type, name))
+ elif code in ("-", "I", "C"):
+ reason = query_drop_reason[code]
+ print ("dropped query (%s) from %s:%s (id %s): %s %s"
+ % (reason, ip, port, id, type, name))
+ elif code == "/":
+ print ("dropped query (couldn't parse) from %s:%s"
+ % (ip, port))
+ else:
+ print ("%s from %s:%s (id %s): %s %s"
+ % (code, ip, port, id, type, name))
+
+
+def parse_logfile(file, filename):
+ # Open pipe to tai64nlocal: we will write lines of our input (the
+ # raw log file) to it, and read log lines with readable timestamps
+ # from it.
+ tai = Popen(["tai64nlocal"], stdin=PIPE, stdout=PIPE, text=True, bufsize=0)
+
+ for line in file:
+ tai.stdin.write(line)
+ line = tai.stdout.readline()
+
+ match = tinydns_log_re.match(line)
+ if match:
+ handle_tinydns_log(line, match)
+ continue
+
+ match = dnscache_log_re.match(line)
+ if match:
+ handle_dnscache_log(line, match)
+ continue
+
+ sys.stdout.write(line)
+
+def main():
+ if len(sys.argv) > 1:
+ for filename in sys.argv[1:]:
+ if filename == "-":
+ parse_logfile(sys.stdin, "(stdin)")
+ else:
+ with open(filename) as file:
+ parse_logfile(file, filename)
+ else:
+ parse_logfile(sys.stdin, "(stdin)")
+
+
+
+if __name__ == "__main__":
+ main()
--- /dev/null
+ GNU AFFERO GENERAL PUBLIC LICENSE
+ Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+Also add information on how to contact you by electronic and paper mail.
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projects / djbdns-logparse.git / commitdiff