| 1 | #!/usr/bin/env python
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| 2 | # vim:ts=2:et:sw=2:ai
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| 3 | #
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| 4 | # Scan Wireless Leiden Network and report status of links and nodes
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| 5 | #
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| 6 | # Rick van der Zwet <info@rickvanderzwet.nl>
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| 7 |
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| 8 | from pprint import pprint
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| 9 | from xml.dom.minidom import parse, parseString
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| 10 | import gformat
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| 11 | import os.path
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| 12 | import re
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| 13 | import subprocess
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| 14 | import sys
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| 15 | import time
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| 16 | import yaml
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| 17 | from datetime import datetime
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| 18 |
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| 19 | # When force is used as argument, use this range
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| 20 | DEFAULT_SCAN_RANGE= ['172.16.0.0/21']
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| 21 |
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| 22 | #
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| 23 | # BEGIN nmap XML parser
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| 24 | # XXX: Should properly go to seperate class/module
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| 25 | def get_attribute(node,attr):
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| 26 | return node.attributes[attr].value
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| 27 |
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| 28 | def attribute_from_node(parent,node,attr):
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| 29 | return parent.getElementsByTagName(node)[0].attributes[attr].value
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| 30 |
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| 31 | def parse_port(node):
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| 32 | item = dict()
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| 33 | item['protocol'] = get_attribute(node,'protocol')
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| 34 | item['portid'] = get_attribute(node,'portid')
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| 35 | item['state'] = attribute_from_node(node,'state','state')
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| 36 | item['reason'] = attribute_from_node(node,'state','reason')
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| 37 | return item
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| 38 |
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| 39 | def parse_ports(node):
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| 40 | item = dict()
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| 41 | for port in node.getElementsByTagName('port'):
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| 42 | port_item = parse_port(port)
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| 43 | item[port_item['portid']] = port_item
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| 44 | return item
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| 45 |
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| 46 | def parse_host(node):
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| 47 | # Host status
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| 48 | item = dict()
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| 49 | item['state'] = attribute_from_node(node,'status','state')
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| 50 | item['reason'] = attribute_from_node(node,'status','reason')
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| 51 | item['addr'] = attribute_from_node(node,'address','addr')
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| 52 | item['addrtype'] = attribute_from_node(node,'address','addrtype')
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| 53 |
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| 54 | # Service status
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| 55 | ports = node.getElementsByTagName('ports')
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| 56 | if ports:
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| 57 | item['port'] = parse_ports(ports[0])
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| 58 | return item
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| 59 |
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| 60 | def parse_nmap(root):
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| 61 | status = dict()
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| 62 | for node in root.childNodes[2].getElementsByTagName('host'):
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| 63 | scan = parse_host(node)
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| 64 | if not status.has_key(scan['addr']):
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| 65 | status[scan['addr']] = scan
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| 66 | return status
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| 67 | #
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| 68 | # END nmap parser
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| 69 | #
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| 70 |
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| 71 |
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| 72 |
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| 73 | def _do_nmap_scan(command, iphosts):
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| 74 | """ Run/Read nmap XML with various choices"""
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| 75 | command = "nmap -n -iL - -oX - %s" %(command)
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| 76 | print "# New run '%s', can take a while to complete" % (command)
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| 77 | p = subprocess.Popen(command.split(),
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| 78 | stdout=subprocess.PIPE,
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| 79 | stderr=subprocess.PIPE,
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| 80 | stdin=subprocess.PIPE, bufsize=-1)
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| 81 |
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| 82 | (stdoutdata, stderrdata) = p.communicate("\n".join(iphosts))
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| 83 | if p.returncode != 0:
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| 84 | print "# [ERROR] nmap failed to complete '%s'" % stderrdata
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| 85 | sys.exit(1)
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| 86 |
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| 87 | dom = parseString(stdoutdata)
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| 88 | return (parse_nmap(dom),stdoutdata)
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| 89 |
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| 90 |
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| 91 |
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| 92 | def do_nmap_scan(command, iphosts, result_file=None, forced_scan=False):
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| 93 | """ Wrapper around _run_nmap to get listing of all hosts, the default nmap
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| 94 | does not return results for failed hosts"""
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| 95 | # Get all hosts to be processed
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| 96 | (init_status, stdoutdata) = _do_nmap_scan(" -sL",iphosts)
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| 97 |
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| 98 | # Return stored file if exists
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| 99 | if not forced_scan and result_file and os.path.exists(result_file) \
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| 100 | and os.path.getsize(result_file) > 0:
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| 101 | print "# Reading stored NMAP results from '%s'" % (result_file)
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| 102 | status = parse_nmap(parse(result_file))
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| 103 | else:
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| 104 | # New scan
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| 105 | (status, stdoutdata) = _do_nmap_scan(command, iphosts)
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| 106 |
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| 107 | # Store result if requested
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| 108 | if result_file:
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| 109 | print "# Saving results in %s" % (result_file)
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| 110 | f = file(result_file,'w')
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| 111 | f.write(stdoutdata)
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| 112 | f.close()
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| 113 |
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| 114 | init_status.update(status)
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| 115 | return init_status
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| 116 |
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| 117 |
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| 118 |
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| 119 | def do_snmpwalk(host, oid):
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| 120 | """ Do snmpwalk, returns (p, stdout, stderr)"""
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| 121 | # GLobal SNMP walk options
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| 122 | snmpwalk = ('snmpwalk -r 0 -t 1 -OX -c public -v 2c %s' % host).split()
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| 123 | p = subprocess.Popen(snmpwalk + [oid],
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| 124 | stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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| 125 | (stdoutdata, stderrdata) = p.communicate()
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| 126 | stdoutdata = stdoutdata.split('\n')[:-1]
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| 127 | stderrdata = stderrdata.split('\n')[:-1]
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| 128 | return (p, stdoutdata, stderrdata)
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| 129 |
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| 130 |
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| 131 |
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| 132 |
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| 133 | def do_snmp_scan(iphosts, status, stored_status=dict(), forced_scan=False):
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| 134 | """ SNMP scanning, based on results fould in NMAP scan"""
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| 135 | mac_to_host = dict()
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| 136 | host_processed = dict()
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| 137 |
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| 138 | #
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| 139 | # Gather SNMP data from hosts
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| 140 | for host in iphosts:
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| 141 | # Status might be containing old hosts as well and visa-versa
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| 142 | if not status.has_key(host):
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| 143 | print "## [ERROR] No nmap result found"
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| 144 | continue
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| 145 |
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| 146 | scan = status[host]
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| 147 | if scan['state'] != "up":
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| 148 | continue
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| 149 |
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| 150 | print '# Processing host %s' % host
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| 151 | # IP -> Mac addresses found in host ARP table, with key IP
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| 152 | status[host]['arpmac'] = dict()
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| 153 | # MAC -> iface addresses, with key MAC
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| 154 | status[host]['mac'] = dict()
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| 155 | # Mirrored: iface -> MAC addresses, with key interface name
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| 156 | status[host]['iface'] = dict()
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| 157 | try:
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| 158 | if not forced_scan and stored_status[host]['snmp_retval'] != 0:
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| 159 | print "## SNMP Connect failed last time, ignoring"
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| 160 | continue
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| 161 | except:
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| 162 | pass
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| 163 |
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| 164 | stored_status[host] = dict()
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| 165 | if not "open" in scan['port']['161']['state']:
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| 166 | print "## [ERROR] SNMP port not opened"
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| 167 | continue
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| 168 |
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| 169 | (p, output, stderrdata) = do_snmpwalk(host, 'SNMPv2-MIB::sysDescr')
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| 170 | stored_status[host]['snmp_retval'] = p.returncode
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| 171 | # Assume host remain reachable troughout all the SNMP queries
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| 172 | if p.returncode != 0:
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| 173 | print "## [ERROR] SNMP failed '%s'" % ",".join(stderrdata)
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| 174 | continue
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| 175 |
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| 176 | # Get some host details
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| 177 | # SNMPv2-MIB::sysDescr.0 = STRING: FreeBSD CNodeSOM1.wLeiden.NET
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| 178 | # 8.0-RELEASE-p2 FreeBSD 8.0-RELEASE-p2 #2: Fri Feb 19 18:24:23 CET 2010
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| 179 | # root@80fab2:/usr/obj/nanobsd.wleiden/usr/src/sys/kernel.wleiden i386
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| 180 | status[host]['sys_desc'] = output[0]
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| 181 | hostname = output[0].split(' ')[4]
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| 182 | release = output[0].split(' ')[5]
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| 183 | stored_status[host]['hostname'] = status[host]['hostname'] = hostname
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| 184 | stored_status[host]['release'] = status[host]['release'] = release
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| 185 | print "## %(hostname)s - %(release)s" % stored_status[host]
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| 186 |
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| 187 | # Check if the host is already done processing
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| 188 | # Note: the host is marked done processing at the end
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| 189 | if host_processed.has_key(hostname):
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| 190 | print "## Host already processed this run"
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| 191 | continue
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| 192 |
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| 193 | # Interface list with key the index number
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| 194 | iface_descr = dict()
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| 195 | # IF-MIB::ifDescr.1 = STRING: ath0
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| 196 | r = re.compile('^IF-MIB::ifDescr\[([0-9]+)\] = STRING: ([a-z0-9]+)$')
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| 197 | (p, output, stderrdata) = do_snmpwalk(host, 'IF-MIB::ifDescr')
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| 198 | for line in output:
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| 199 | m = r.match(line)
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| 200 | iface_descr[m.group(1)] = m.group(2)
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| 201 |
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| 202 | # IF-MIB::ifPhysAddress[1] = STRING: 0:80:48:54:bb:52
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| 203 | r = re.compile('^IF-MIB::ifPhysAddress\[([0-9]+)\] = STRING: ([0-9a-f:]*)$')
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| 204 | (p, output, stderrdata) = do_snmpwalk(host, 'IF-MIB::ifPhysAddress')
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| 205 | for line in output:
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| 206 | m = r.match(line)
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| 207 | # Ignore lines which has no MAC address
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| 208 | if not m.group(2): continue
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| 209 | index = m.group(1)
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| 210 | # Convert to proper MAC
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| 211 | mac = ":".join(["%02X" % int(x,16) for x in m.group(2).split(':')])
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| 212 | if not iface_descr.has_key(index):
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| 213 | print "## Index cannot be mapped to a key, available:"
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| 214 | for index, value in iface_descr.iteritems():
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| 215 | print "## - %s [%s]" % (value, index)
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| 216 | else:
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| 217 | print "## Local MAC %s [index:%s] -> %s" % (iface_descr[index], index, mac)
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| 218 | status[host]['mac'][mac] = iface_descr[index]
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| 219 | status[host]['iface'][iface_descr[index]] = mac
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| 220 | mac_to_host[mac] = hostname
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| 221 |
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| 222 | # Process host SNMP status
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| 223 | (p, output, stderrdata) = do_snmpwalk(host, 'RFC1213-MIB::atPhysAddress')
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| 224 | # RFC1213-MIB::atPhysAddress[8][1.172.21.160.34] = Hex-STRING: 00 17 C4 CC 5B F2
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| 225 | r = re.compile('^RFC1213-MIB::atPhysAddress\[[0-9]+\]\[1\.([0-9\.]+)\] = Hex-STRING: ([0-9A-F\ ]+)$')
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| 226 | for line in output:
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| 227 | m = r.match(line)
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| 228 | ip = m.group(1)
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| 229 | # Replace spaces in MAC with :
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| 230 | mac = ":".join(m.group(2).split(' ')[:-1])
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| 231 | status[host]['arpmac'][ip] = mac
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| 232 |
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| 233 | local = '[remote]'
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| 234 | if mac in status[host]['mac'].keys():
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| 235 | local = '[local]'
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| 236 | print "## Arp table MAC %s -> %s %s" % (ip, mac, local)
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| 237 |
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| 238 | # Make sure we keep a record of the processed host which ip entry to check
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| 239 | host_processed[hostname] = host
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| 240 |
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| 241 | stored_status['host_processed'] = host_processed
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| 242 | stored_status['mac_to_host'] = mac_to_host
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| 243 | stored_status['nmap_status'] = status
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| 244 | return stored_status
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| 245 |
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| 246 |
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| 247 |
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| 248 |
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| 249 | def generate_status(configs, stored_status):
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| 250 | """ Generate result file from stored_status """
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| 251 | host_processed = stored_status['host_processed']
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| 252 | mac_to_host = stored_status['mac_to_host']
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| 253 | status = stored_status['nmap_status']
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| 254 |
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| 255 | # Data store format used for nodemap generation
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| 256 | nodemap_status_file = '/tmp/nodemap_status.yaml'
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| 257 | nodemap = { 'node' : {}, 'link' : {}}
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| 258 |
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| 259 | # XXX: Pushed back till we actually store the MAC in the config files automatically
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| 260 | #configmac_to_host = dict()
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| 261 | #for host,config in configs.iteritems():
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| 262 | # for iface_key in gformat.get_interface_keys(config):
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| 263 | # configmac_to_host[config[iface_key]['mac']] = host
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| 264 |
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| 265 | # List of hosts which has some kind of problem
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| 266 | for host in configs.keys():
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| 267 | fqdn = host + ".wLeiden.NET"
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| 268 | if fqdn in host_processed.keys():
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| 269 | continue
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| 270 | config = configs[host]
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| 271 | print "# Problems in host '%s'" % host
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| 272 | host_down = True
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| 273 | for ip in gformat.get_used_ips([config]):
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| 274 | if not gformat.valid_addr(ip):
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| 275 | continue
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| 276 | if status[ip]['state'] == "up":
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| 277 | host_down = False
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| 278 | print "## - ", ip, status[ip]['state']
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| 279 | if host_down:
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| 280 | print "## HOST is DOWN!"
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| 281 | nodemap['node'][fqdn] = gformat.DOWN
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| 282 | else:
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| 283 | print "## SNMP problems (not reachable, deamon not running, etc)"
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| 284 | nodemap['node'][fqdn] = gformat.UNKNOWN
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| 285 |
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| 286 |
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| 287 |
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| 288 | # Correlation mapping
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| 289 | for fqdn, ip in host_processed.iteritems():
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| 290 | details = status[ip]
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| 291 | nodemap['node'][fqdn] = gformat.OK
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| 292 | print "# Working on %s" % fqdn
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| 293 | for ip, arpmac in details['arpmac'].iteritems():
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| 294 | if arpmac in details['mac'].keys():
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| 295 | # Local MAC address
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| 296 | continue
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| 297 | if not mac_to_host.has_key(arpmac):
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| 298 | print "## [WARN] No parent host for MAC %s (%s) found" % (arpmac, ip)
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| 299 | else:
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| 300 | print "## Interlink %s - %s" % (fqdn, mac_to_host[arpmac])
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| 301 | nodemap['link'][(fqdn,mac_to_host[arpmac])] = gformat.OK
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| 302 |
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| 303 | stream = file(nodemap_status_file,'w')
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| 304 | yaml.dump(nodemap, stream, default_flow_style=False)
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| 305 | print "# Wrote nodemap status to '%s'" % nodemap_status_file
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| 306 |
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| 307 | def usage():
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| 308 | print "Usage: %s <arguments>"
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| 309 | print "Arguments:"
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| 310 | print "\tall = scan all known ips, using cached nmap"
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| 311 | print "\tnmap-only = scan all known ips, using nmap only"
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| 312 | print "\tsnmp-only = scan all known ips, using snmp only"
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| 313 | print "\tforce = scan all known ips, no cache used"
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| 314 | print "\tforced-snmp = scan all known ips, no snmp cache"
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| 315 | print "\tstored = generate status file using stored entries"
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| 316 | print "\thost <HOST1> [HOST2 ...] = generate status file using stored entries"
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| 317 | print "\tmerge <FILE1> [FILE2 ...] = merge status file with other status files"
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| 318 | sys.exit(0)
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| 319 |
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| 320 |
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| 321 | def main():
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| 322 | start_time = datetime.now()
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| 323 | stored_status_file = '/tmp/stored_status.yaml'
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| 324 | nmap_result_file = '/tmp/test.xml'
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| 325 |
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| 326 | stored_status = dict()
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| 327 | nmap_status = dict()
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| 328 | snmp_status = dict()
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| 329 |
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| 330 | opt_nmap_scan = True
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| 331 | opt_store_scan = True
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| 332 | opt_snmp_scan = True
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| 333 | opt_force_snmp = False
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| 334 | opt_force_scan = False
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| 335 | opt_force_range = False
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| 336 | if len(sys.argv) == 1:
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| 337 | usage()
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| 338 |
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| 339 | if sys.argv[1] == "all":
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| 340 | pass
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| 341 | elif sys.argv[1] == "nmap-only":
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| 342 | opt_snmp_scan = False
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| 343 | elif sys.argv[1] == "snmp-only":
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| 344 | opt_nmap_scan = False
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| 345 | elif sys.argv[1] == "force":
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| 346 | opt_force_scan = True
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| 347 | elif sys.argv[1] == "forced-snmp":
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| 348 | opt_nmap_scan = False
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| 349 | opt_force_snmp = True
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| 350 | elif sys.argv[1] == "host":
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| 351 | opt_force_range = True
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| 352 | opt_force_scan = True
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| 353 | elif sys.argv[1] == "stored":
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| 354 | opt_snmp_scan = False
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| 355 | opt_nmap_scan = False
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| 356 | opt_store_scan = False
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| 357 | else:
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| 358 | usage()
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| 359 |
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| 360 | # By default get all IPs defined in config, else own range
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| 361 | if not opt_force_range:
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| 362 | configs = gformat.get_all_configs()
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| 363 | iplist = gformat.get_used_ips(configs.values())
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| 364 | else:
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| 365 | iplist = sys.argv[1:]
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| 366 |
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| 367 | # Load data hints from previous run if exists
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| 368 | if not opt_force_scan and os.path.exists(stored_status_file) and os.path.getsize(stored_status_file) > 0:
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| 369 | print "## Loading stored data hints from '%s'" % stored_status_file
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| 370 | stream = file(stored_status_file,'r')
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| 371 | stored_status = yaml.load(stream)
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| 372 | else:
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| 373 | print "[ERROR] '%s' does not exists" % stored_status_file
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| 374 |
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| 375 | # Do a NMAP discovery
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| 376 | if opt_nmap_scan:
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| 377 | if not opt_store_scan:
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| 378 | nmap_result_file = None
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| 379 | nmap_status = do_nmap_scan(
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| 380 | "-p T:ssh,U:domain,T:80,T:ntp,U:snmp,T:8080 -sU -sT ",
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| 381 | iplist,nmap_result_file, opt_force_scan)
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| 382 |
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| 383 | else:
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| 384 | nmap_status = stored_status['nmap_status']
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| 385 |
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| 386 | # Save the MAC -> HOST mappings, by default as it helps indentifing the
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| 387 | # 'unknown links'
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| 388 | mac_to_host = {}
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| 389 | if stored_status:
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| 390 | mac_to_host = stored_status['mac_to_host']
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| 391 |
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| 392 | # Do SNMP discovery
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| 393 | if opt_snmp_scan:
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| 394 | snmp_status = do_snmp_scan(iplist, nmap_status, stored_status, opt_force_snmp)
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| 395 | else:
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| 396 | snmp_status = stored_status
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| 397 |
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| 398 | # Include our saved MAC -> HOST mappings
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| 399 | mac_to_host.update(snmp_status['mac_to_host'])
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| 400 | snmp_status['mac_to_host'] = mac_to_host
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| 401 |
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| 402 | # Store changed data to disk
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| 403 | if opt_store_scan:
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| 404 | stream = file(stored_status_file,'w')
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| 405 | yaml.dump(snmp_status, stream, default_flow_style=False)
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| 406 | print "## Stored data hints to '%s'" % stored_status_file
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| 407 |
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| 408 | # Finally generated status
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| 409 | generate_status(configs, snmp_status)
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| 410 | print "# Took %s seconds to complete" % (datetime.now() - start_time).seconds
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| 411 |
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| 412 |
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| 413 |
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| 414 | if __name__ == "__main__":
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| 415 | main()
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