def encapsule(self, ip_event, udp_event, src_ip=None, src_port=None):
"""
"""
# prepare layers
src = self.sourceIp
dst = self.cfg['dst-ip']
srcP = self.sourcePort
dstP = self.cfg['dst-port']
if src_ip is not None:
src = src_ip
dst = self.sourceIp
if src_port is not None:
srcP = src_port
dstP = self.sourcePort
layer_ip = AdapterIP.ip( source=src, destination=dst, version= "%s" % self.cfg['sock-family'], more=ip_event )
layer_udp = templates.udp(source=srcP, destination=dstP)
layer_udp.addMore(more=udp_event)
# prepare template
if self.cfg['agent-support']:
layer_agent= TestTemplatesLib.TemplateLayer('AGENT')
layer_agent.addKey(name='name', data=self.cfg['agent']['name'] )
layer_agent.addKey(name='type', data=self.cfg['agent']['type'] )
tpl = TestTemplatesLib.TemplateMessage()
if self.cfg['agent-support']:
tpl.addLayer(layer=layer_agent)
tpl.addLayer(layer=layer_ip)
tpl.addLayer(layer=layer_udp)
return tpl
def getExpectedTemplate(self, tpl, versionIp=None, sourceIp=None, destinationIp=None,
sourcePort=None, destinationPort=None):
"""
Return an expected template with ip and udp layers
"""
# prepare layers
defaultVer = "%s" % self.cfg['sock-family']
if versionIp is not None:
defaultVer = versionIp
layer_ip = AdapterIP.ip( source=sourceIp, destination=destinationIp, version=defaultVer )
layer_udp = templates.udp(source=sourcePort, destination=destinationPort)
layer_udp.addMore(more=tpl)
# prepare template
if self.cfg['agent-support']:
layer_agent= TestTemplatesLib.TemplateLayer('AGENT')
layer_agent.addKey(name='name', data=self.cfg['agent']['name'] )
layer_agent.addKey(name='type', data=self.cfg['agent']['type'] )
tpl = TestTemplatesLib.TemplateMessage()
if self.cfg['agent-support']:
tpl.addLayer(layer=layer_agent)
tpl.addLayer(layer=layer_ip)
tpl.addLayer(layer=layer_udp)
return tpl
def hasReceivedIcmpError(self, timeout=1.0):
"""
Waits to receive "icmp error" event until the end of the timeout
@param timeout: time max to wait to receive event in second (default=1s)
@type timeout: float
@return: an event matching with the template or None otherwise
@rtype: templatemessage
"""
TestAdapterLib.check_timeout(caller=TestAdapterLib.caller(),
timeout=timeout)
# prepare the expected template
expected = TestTemplatesLib.TemplateMessage()
if self.cfg['agent-support']:
layer_agent = TestTemplatesLib.TemplateLayer('AGENT')
layer_agent.addKey(name='name', data=self.cfg['agent']['name'])
layer_agent.addKey(name='type', data=self.cfg['agent']['type'])
expected.addLayer(layer_agent)
expected.addLayer(layer=templates.udp(more=templates.icmp_error()))
# wait
evt = self.received(expected=expected, timeout=timeout)
if evt is None:
return None
return evt
def onInactivityTimeout(self):
"""
"""
tpl = TestTemplatesLib.TemplateMessage()
tpl.addLayer(layer=AdapterIP.ip(more=AdapterIP.received()))
tpl.addLayer(layer=templates.udp(more=templates.received()))
self.onInactivity(lower=tpl)
def onIcmpError(self, error):
"""
"""
## TODO: version IP
icmp = error.get('ICMP4')
icmp_type = icmp.get('type')
icmp_type_str = icmp_type.get('string')
if icmp_type_str is None:
icmp_type_str = 'Unknown'
icmp_code = icmp.get('code')
icmp_code_str = icmp_code.get('string')
if icmp_code_str is None:
icmp_code_str = 'Unknown'
icmp_data = icmp.get('data')
if isinstance(icmp_data, TestTemplatesLib.TemplateLayer):
icmp_data = icmp_data.getName()
# check if the response is for me ?
if icmp_data[:64] == self.ip.getLast64bSent():
tpl = TestTemplatesLib.TemplateMessage()
tpl.addLayer(layer=templates.udp(more=templates.icmp_error(
error=icmp_type_str, details=icmp_code_str)))
if self.logEventReceived:
self.logRecvEvent(shortEvt='icmp error', tplEvt=tpl)
def getExpectedTemplate(self,
tpl,
versionIp=None,
sourceIp=None,
destinationIp=None,
sourcePort=None,
destinationPort=None):
"""
Return an expected template with ip and udp layers
"""
# prepare layers
defaultVer = self.cfg['sock-family']
if versionIp is not None:
defaultVer = versionIp
layer_ip = AdapterIP.ip(source=sourceIp,
destination=destinationIp,
version=defaultVer)
layer_udp = templates.udp(source=sourcePort,
destination=destinationPort)
layer_udp.addMore(more=tpl)
# prepare template
tpl = TestTemplatesLib.TemplateMessage()
tpl.addLayer(layer=layer_ip)
tpl.addLayer(layer=layer_udp)
return tpl
def encapsule(self, ip_event, udp_event, src_ip=None, src_port=None):
"""
"""
# prepare layers
src = self.sourceIp
srcP = self.sourcePort
dst = ''
dstP = ''
if src_ip is not None:
src = src_ip
dst = self.sourceIp
if src_port is not None:
srcP = src_port
dstP = self.sourcePort
layer_ip = AdapterIP.ip(source=src,
destination=dst,
version=self.cfg['sock-family'],
more=ip_event)
layer_udp = templates.udp(source=srcP, destination=dstP)
layer_udp.addMore(more=udp_event)
# prepare template
tpl = TestTemplatesLib.TemplateMessage()
tpl.addLayer(layer=layer_ip)
tpl.addLayer(layer=layer_udp)
return tpl
def decode(self, udp, ipSrc, ipDst):
"""
"""
udp_hdr = struct.unpack('!4H', udp[:UDP_LEN])
## source: 2 bytes
src_port = udp_hdr[0]
## destination: 2 bytes
dst_port = udp_hdr[1]
## length: 2 bytes
lgth = udp_hdr[2]
## checksum: 2 bytes
udp_sum = udp_hdr[3]
udp_sum_hex = "0x%0.4X" % udp_sum
## extract data
data_upper = udp[UDP_LEN:]
# checksum is correct ? optional for udp
# An all zero transmitted checksum value means that the transmitter generated no checksum (for
# debugging or for higher level protocols that don't care).
if udp_sum != 0:
speudo_hdr = self.speudoHeader(ipSrc=ipSrc,
ipDst=ipDst,
udpLength=lgth)
sum_computed = self.checksum.compute(
data=''.join([speudo_hdr, udp]),
checksum_offset=OFFSET_CHECKSUM_WITH_SPEUDO_HDR)
sum_status = 'incorrect, should be 0x%0.4X' % sum_computed
if udp_sum == sum_computed:
sum_status = 'correct'
self.debug('udp checksum computed')
else:
sum_status = "don't care"
# Decode OK, create template
udp_tpl = templates.udp(source=str(src_port),
destination=str(dst_port),
length=str(lgth),
sum=udp_sum_hex,
sum_status=sum_status,
sum_int=str(udp_sum),
data=data_upper,
data_size=len(data_upper))
# add the raw data to the layer
udp_tpl.addRaw(udp[:UDP_LEN])
# set summary
summary = 'Port=%s>%s, Len=%s' % (src_port, dst_port, len(data_upper))
# if dst_port == self.srcPort:
# summary = 'Port=%s<%s, Len=%s' % (dst_port, src_port, len(data_upper))
return udp_tpl, summary, data_upper
def hasReceivedData(self,
timeout=1.0,
dstIp=None,
srcIp=None,
srcPort=None,
dstPort=None,
data=None):
"""
Waits to receive "data" event until the end of the timeout
@param timeout: time max to wait to receive event in second (default=1s)
@type timeout: float
@param dstIp: destination ip
@type dstIp: none/string/operators
@param srcIp: source ip
@type srcIp: none/string/operators
@param srcPort: source port
@type srcPort: none/integer/operators
@param dstPort: destination port
@type dstPort: none/integer/operators
@param data: upper data
@type data: none/string/operators
@return: an event matching with the template or None otherwise
@rtype: templatemessage
"""
TestAdapterLib.check_timeout(caller=TestAdapterLib.caller(),
timeout=timeout)
# prepare the expected template
ether_tpl = AdapterEthernet.ethernet()
expected = self.encapsule(layer=ether_tpl)
ip_tpl = AdapterIP.ip(source=srcIp, destination=dstIp)
expected.addLayer(ip_tpl)
udp_tpl = templates.udp(source=srcPort, destination=dstPort, data=None)
expected.addLayer(udp_tpl)
# wait
evt = self.received(expected=expected, timeout=timeout)
if evt is None:
return None
return evt
def sendData(self,
data,
destIp=None,
destPort=0,
srcPort=0,
totalLength=None,
checksum=None,
destMac=None):
"""
Send data to the ip/port passed as argument
@param data: data to send over udp
@type data: string
@param destIp: destination ip address
@type destIp: none/integer
@param destMac: destination mac address
@type destMac: none/integer
@param destPort: destination port
@type destPort: integer
@param srcPort: source port
@type srcPort: integer
@param totalLength: total length, auto computed if not provided
@type totalLength: none/integer
@param checksum: checksum, auto computed if not provided
@type checksum: integer
"""
try:
if self.port2sniff == codec.ALL:
src_port = int(srcPort)
else:
src_port = int(self.port2sniff)
# add the separator
data = self.addSeparator(data=data)
layer_udp = templates.udp(source=src_port,
destination=int(destPort),
length=totalLength,
sum=checksum,
data=data)
except Exception as e:
raise TestAdapterLib.AdapterException(
TestAdapterLib.caller(),
'Cannot prepare udp template: %s' % str(e))
else:
# encode the template udp
try:
udp_pkt, summary = self.udpCodec.encode(
udp_tpl=layer_udp,
ipSrc=self.ip.getSourceIP(),
ipDst=destIp)
except Exception as e:
raise TestAdapterLib.AdapterException(
TestAdapterLib.caller(),
"Cannot encode udp data: %s" % str(e))
else:
# Send packet
try:
lower = self.ip.sendDatagram(dstMac=destMac,
dstIp=destIp,
data=udp_pkt,
protocol=AdapterIP.UDP)
except Exception as e:
raise TestAdapterLib.AdapterException(
TestAdapterLib.caller(),
"Unable to send udp data: %s" % str(e))
else:
lower.addLayer(layer_udp)
if self.logEventSent:
layer_udp.addRaw(raw=udp_pkt)
else:
layer_udp.addRaw(raw=udp_pkt[:codec.UDP_LEN])
if self.logEventSent:
self.logSentEvent(shortEvt=summary, tplEvt=lower)
return lower
def onReceiving(self, data, fromAddr, toAddr, lower):
"""
Function to overwrite
Called on incoming data
@param data: data received
@type data: string
@param lower: template data received
@type lower: templatemessage
"""
# extract transport info
self.lastActivity = time.time()
srcIp, srcPort = fromAddr
dstIp, dstPort = toAddr
# the separator feature is disabled, to nothing
if self.cfg['sep-disabled']:
try:
self.handleIncomingData(data=data, lower=lower)
except Exception as e:
self.error(
"on handle incoming udp data, upper layer problem: %s" %
str(e))
else:
# bufferize data
if self.buf.has_key(fromAddr):
self.buf[fromAddr] = ''.join([self.buf[fromAddr], data])
else:
self.buf[fromAddr] = data
# split data with the separator
datas = self.buf[fromAddr].split(self.cfg['sep-in'])
for d in datas[:-1]:
udp_data = d + self.cfg['sep-in']
udp_data_size = len(udp_data)
# construct high template and log it
tpl = TestTemplatesLib.TemplateMessage()
tpl.addLayer(
layer=AdapterIP.ip(source=srcIp,
destination=dstIp,
more=AdapterIP.received(),
version=self.cfg['ip-version']))
if self.logEventReceived:
udp_layer = templates.udp(
source=srcPort,
destination=dstPort,
more=templates.received(
data=udp_data, data_length=str(udp_data_size)))
else:
udp_layer = templates.udp(
source=srcPort,
destination=dstPort,
more=templates.received(
data_length=str(udp_data_size)))
tpl.addLayer(layer=udp_layer)
if self.logEventReceived:
tpl.addRaw(raw=udp_data)
self.logRecvEvent(shortEvt='data reassembled', tplEvt=tpl)
# handle data
self.handleIncomingData(udp_data, lower=tpl)
self.buf[fromAddr] = datas[-1]