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apollock |
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#!/usr/bin/python |
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import optparse |
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import logging |
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import urllib |
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import sys |
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# |
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# See |
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# http://blog.steve.org.uk/wash_your_face_and_try_again__if_you_survive_.html |
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# http://blog.steve.org.uk/i_don_t_have_no_other_pants_.html |
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# for more background |
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# |
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# Copyright (c) 2008 Andrew Pollock <me@andrew.net.au> |
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# |
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# Permission to use, copy, distribute, modify, and otherwise knock yourself out |
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# granted under the terms of the GNU General Public Licence v2 |
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# |
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__author__ = "Andrew Pollock <me@andrew.net.au>" |
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__licence__ = "GPLv2" |
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HOSTNAME_FIELD=3 |
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PREFIX_FIELD_START=4 |
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FIELD_AFTER_PREFIX="IN=" |
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SRC_FIELD_OFFSET=3 |
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def setup_logging(options): |
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""" |
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Initialise logging |
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Args: |
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options: options object |
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""" |
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logging.getLogger("").setLevel(1) |
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console = logging.StreamHandler() |
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console_formatter = logging.Formatter("%(levelname)-8s %(message)s") |
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console.setFormatter(console_formatter) |
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if options.verbose: |
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console.setLevel(logging.DEBUG) |
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else: |
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console.setLevel(logging.INFO) |
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logging.getLogger("").addHandler(console) |
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def process_options(): |
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""" |
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Do all the command line option parsing |
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Returns: |
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an options object |
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""" |
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USAGE="usage: %prog [options]" |
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parser = optparse.OptionParser(usage=USAGE) |
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parser.add_option( |
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"-v", "--verbose", |
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default=False, |
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action="store_true", |
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dest="verbose", |
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help="increase verbosity", |
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) |
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parser.add_option( |
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"-p", "--prefix", |
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default="", |
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action="store", |
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dest="prefix", |
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help="prefix to restrict matches to", |
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) |
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parser.add_option( |
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"--host", |
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default="", |
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action="store", |
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dest="hostname", |
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help="host to restrict matches to", |
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) |
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parser.add_option( |
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"-l", |
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"--logfile", |
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default="/var/log/ulog/syslogemu.log", |
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action="store", |
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dest="log", |
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help="log file to process [default: %default]", |
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) |
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parser.add_option( |
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"-n", |
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"--dry-run", |
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default=False, |
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action="store_true", |
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dest="dryrun", |
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help="do nothing, just show what would happen", |
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) |
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(options, unused_args) = parser.parse_args() |
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return options |
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def get_prefix(ulogentry): |
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""" |
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Return the prefix component of a ulog entry |
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Args: |
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ulogentry: a list of strings representing one line of a ulog entry |
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Returns: |
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A list consisting of the prefix and the number of the field after the |
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prefix |
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""" |
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prefix=[] |
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for component in xrange(PREFIX_FIELD_START, len(ulogentry)): |
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if not ulogentry[component].startswith(FIELD_AFTER_PREFIX): |
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prefix.append(ulogentry[component]) |
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else: |
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break |
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# If for some reason we reached the end of the line without finding |
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# FIELD_AFTER_PREFIX, something is probably wrong |
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if component == len(ulogentry): |
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return None |
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else: |
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return (" ".join(prefix), component) |
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def process_log(options): |
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""" |
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Process the log file |
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Args: |
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options object |
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Returns: |
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A set of IP addresses |
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Discussion: |
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A line of the log file can look like: |
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Aug 31 06:46:06 caesar FORWARD too-hard-basket IN=eth0 OUT=eth1 MAC=00:08:02:52: |
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49:d7:00:02:3b:01:f0:87:08:00 SRC=64.142.100.44 DST=172.16.0.7 LEN=128 TOS=00 P |
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REC=0x00 TTL=59 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=42504 SEQ=6344 |
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Notably, the "FORWARD too-hard-basket" is a user definable string, which can |
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contain whitespace, so therefore there's no predetermined position that the |
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SRC= field can be found in, therefore for each line, we need to iterate over |
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each whitespace-separated "word" until we find the right one. Bit of a bummer |
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that. |
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""" |
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# TODO(apollock): This needs refactoring, there's too much duplication |
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ips = set() |
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# TODO(apollock): exception handling! |
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try: |
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log = open(options.log) |
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except IOError, e: |
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logging.critical("Could not open %s (%s)" % (options.log, e.strerror)) |
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sys.exit(1) |
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while True: |
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log_entry = log.readline().split() |
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if not log_entry: |
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logging.debug("Reached the end of the file") |
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break |
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if options.hostname and log_entry[HOSTNAME_FIELD] != options.hostname: |
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logging.debug("Entry not for the host we're looking for") |
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continue |
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# We know where the prefix starts (if there is one) |
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if log_entry[PREFIX_FIELD_START].startswith(FIELD_AFTER_PREFIX): |
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# We have an entry with no prefix at all |
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logging.debug("Entry has no prefix") |
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if options.prefix: |
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continue |
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else: |
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# We need to build the prefix and check |
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(prefix, next_field) = get_prefix(log_entry) |
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if prefix and prefix == options.prefix: |
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# We have a valid line to work with |
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ips.add(log_entry[next_field + SRC_FIELD_OFFSET].split("SRC=")[1]) |
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else: |
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logging.debug("(1) Entry not for the prefix we're looking for") |
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continue |
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else: |
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# We have part of the prefix and need to build it |
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(prefix, next_field) = get_prefix(log_entry) |
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if prefix and prefix == options.prefix: |
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# We have a valid line to work with |
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ips.add(log_entry[next_field + SRC_FIELD_OFFSET].split("SRC=")[1]) |
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else: |
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logging.debug("(2) Entry not for the prefix we're looking for: %s" |
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% " ".join(log_entry)) |
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continue |
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log.close() |
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return ips |
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def report_ips(options, ips): |
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""" |
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Submit the IPs to the blacklist service |
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Args: |
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options: options object |
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ips: set of IP addresses to report |
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""" |
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SUBMISSION_URL="http://blacklist.steve.org.uk/cgi-bin/report.cgi?src=%s" |
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#SUBMISSION_URL="http://www.andrew.net.au/cgi-bin/report.cgi?src=%s" |
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for ip in ips: |
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if not options.dryrun: |
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result = urllib.urlopen(SUBMISSION_URL % (ip)) |
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logging.info("%s: %s" % (ip, "".join(result.readlines()).rstrip())) |
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result.close() |
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else: |
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print SUBMISSION_URL % (ip) |
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def main(): |
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options = process_options() |
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setup_logging(options) |
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ips = process_log(options) |
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if ips: |
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report_ips(options, ips) |
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if __name__ == "__main__": |
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main() |
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