added ping service
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Rafael.Timmerberg
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1 changed files with 236 additions and 0 deletions
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@ -4,11 +4,247 @@ The ping service in pure Python.
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# http://code.activestate.com/recipes/409689-icmplib-library-for-creating-and-reading-icmp-pack/
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from lib.services.service import Service
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import struct
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class Packet(object):
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"""Creates ICMPv4 and v6 packets.
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header
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two-item sequence containing the type and code of the packet,
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respectively.
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version
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Automatically set to version of protocol being used or None if ambiguous.
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data
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Contains data of the packet. Can only assign a subclass of basestring
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or None.
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packet
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binary representation of packet.
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"""
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header_table = {
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0 : (0, 4),
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#3 : (15, 4), Overlap with ICMPv6
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3 : (15, None),
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#4 : (0, 4), Deprecated by RFC 1812
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5 : (3, 4),
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8 : (0, 4),
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9 : (0, 4),
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10: (0, 4),
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11: (1, 4),
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12: (1, 4),
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13: (0, 4),
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14: (0, 4),
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15: (0, 4),
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16: (0, 4),
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17: (0, 4),
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18: (0, 4),
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1: (4, 6),
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2: (0, 6),
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#3 : (2, 6), Overlap with ICMPv4
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#4 : (2, 6), Type of 4 in ICMPv4 is deprecated
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4: (2, None),
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128: (0, 6),
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129: (0, 6),
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130: (0, 6),
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131: (0, 6),
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132: (0, 6),
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133: (0, 6),
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134: (0, 6),
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135: (0, 6),
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136: (0, 6),
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137: (0, 6),
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}
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def _setheader(self, header):
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"""Set type, code, and version for the packet."""
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if len(header) != 2:
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raise ValueError("header data must be in a two-item sequence")
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type_, code = header
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try:
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max_range, version = self.header_table[type_]
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except KeyError:
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raise ValueError("%s is not a valid type argument" % type_)
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else:
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if code > max_range:
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raise ValueError("%s is not a valid code value for type %s" %\
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(type_, code))
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self._type, self._code, self._version = type_, code, version
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header = property(lambda self: (self._type, self._code), _setheader,
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doc="type and code of packet")
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version = property(lambda self: self._version,
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doc="Protocol version packet is using or None if "
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"ambiguous")
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def _setdata(self, data):
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"""Setter for self.data; will only accept a basestring or None type."""
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if not isinstance(data, basestring) and not isinstance(data, type(None)):
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raise TypeError("value must be a subclass of basestring or None, "
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"not %s" % type(data))
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self._data = data
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data = property(lambda self: self._data, _setdata,
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doc="data contained within the packet")
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def __init__(self, header=(None, None), data=None):
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"""Set instance attributes if given."""
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#XXX: Consider using __slots__
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# self._version initialized by setting self.header
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self.header = header
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self.data = data
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self.type = None
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self.code = None
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def __repr__(self):
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return "<ICMPv%s packet: type = %s, code = %s, data length = %s>" % \
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(self.version, self.type, self.code, len(self.data))
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def create(self):
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"""Return a packet."""
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# Kept as a separate method instead of rolling into 'packet' property so
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# as to allow passing method around without having to define a lambda
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# method.
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args = [self.header[0], self.header[1], 0]
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pack_format = "!BBH"
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if self.data:
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pack_format += "%ss" % len(self.data)
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args.append(self.data)
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# ICMPv6 has the IP stack calculate the checksum
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# For ambiguous cases, just go ahead and calculate it just in case
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if self.version == 4 or not self.version:
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args[2] = self._checksum(struct.pack(pack_format, *args))
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return struct.pack(pack_format, *args)
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packet = property(create,
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doc="Complete ICMP packet")
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def _checksum(self, checksum_packet):
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"""Calculate checksum"""
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byte_count = len(checksum_packet)
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#XXX: Think there is an error here about odd number of bytes
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if byte_count % 2:
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odd_byte = ord(checksum_packet[-1])
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checksum_packet = checksum_packet[:-1]
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else:
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odd_byte = 0
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two_byte_chunks = struct.unpack("!%sH" % (len(checksum_packet)/2),
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checksum_packet)
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total = 0
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for two_bytes in two_byte_chunks:
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total += two_bytes
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else:
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total += odd_byte
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total = (total >> 16) + (total & 0xFFFF)
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total += total >> 16
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return ~total
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def parse(cls, packet):
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"""Parse ICMP packet and return an instance of Packet"""
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string_len = len(packet) - 4 # Ignore IP header
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pack_format = "!BBH"
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if string_len:
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pack_format += "%ss" % string_len
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unpacked_packet = struct.unpack(pack_format, packet)
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packetType, code, checksum = unpacked_packet[:3]
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try:
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data = unpacked_packet[3]
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except IndexError:
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data = None
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return cls((packetType, code), data)
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parse = classmethod(parse)
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import socket
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import time
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import os
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class PingResponse(object):
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def __init__(self, bufferLength, address, ident, seq, rtt):
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self.bufferLength = bufferLength
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self.address = address
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self.ident = ident
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self.seq = seq
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self.rtt = rtt
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def get_response_time(self):
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return self.rtt
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def __str__(self):
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return "%d bytes from %s: id=%s, seq=%u, rtt=%.3f ms" % \
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(self.bufferLength, self.address, self.ident, self.seq, self.rtt)
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class PingService(Service):
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def __init__(self, **kwargs):
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super(PingService, self).__init__(**kwargs)
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self.dataLen = 56
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self.bufferSize = 1500
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def execute(self, host):
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self.ping(host)
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def ping(self, address):
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print "PING (%s): %d data bytes" % (address, self.dataLen)
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## create socket
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s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.getprotobyname('icmp'))
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s.connect((address, 22))
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## setuid back to normal user
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processId = os.getpid()
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os.setuid(processId)
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base_packet = Packet((8, 0))
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seqNum = 0
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## create ping packet
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pdata = struct.pack("!HHd", processId, seqNum, time.time())
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## send initial packet
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base_packet.data = pdata
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s.send(base_packet.packet)
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## recv packet
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buf = s.recv(self.bufferSize)
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current_time = time.time()
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## parse packet; remove IP header first
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r = Packet.parse(buf[20:])
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## parse ping data
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(ident, seq, timestamp) = struct.unpack("!HHd", r.data)
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## calculate rounttrip time
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rtt = current_time - timestamp
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rtt *= 1000
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return PingResponse(len(buf), address, ident, seq, rtt)
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def parse_result(self, executionResult):
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fails = {}
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for host, pingResult in executionResult.items():
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for failKey, failVal in self.get_fails().items():
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respTime = pingResult.get_response_time()
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if int(failVal) > int(respTime):
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fails[failKey] = pingResult
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return fails
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def handle_result(self, parseResult):
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for member in self.get_hostgroup().get_members():
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for failKey, pingResult in parseResult.items():
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for task in member.get_tasks():
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if failKey == task.get_task_type():
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task._execute()
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def create(kwargs):
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