parent
fcddb49a6a
commit
54e19af8c2
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@ -15,7 +15,7 @@ Licensed under MIT License. See LICENSE.
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import ipaddress
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import ipaddress
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import struct
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import struct
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__all__ = ["V9DataFlowSet", "V9DataRecord", "V9ExportPacket", "V9Header", "V9TemplateField",
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__all__ = ["V9DataFlowSet", "V9DataRecord", "V9ExportPacket", "V9Header", "V9TemplateField", "V9OptionsTemplateFlowSet"
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"V9TemplateFlowSet", "V9TemplateNotRecognized", "V9TemplateRecord"]
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"V9TemplateFlowSet", "V9TemplateNotRecognized", "V9TemplateRecord"]
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V9_FIELD_TYPES = {
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V9_FIELD_TYPES = {
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@ -194,8 +194,6 @@ class V9DataFlowSet:
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raise V9TemplateNotRecognized
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raise V9TemplateNotRecognized
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template = templates[self.template_id]
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template = templates[self.template_id]
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if len(template.fields) == 0:
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return #ignore options templates at the moment
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# As the field lengths are variable V9 has padding to next 32 Bit
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# As the field lengths are variable V9 has padding to next 32 Bit
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padding_size = 4 - (self.length % 4) # 4 Byte
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padding_size = 4 - (self.length % 4) # 4 Byte
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@ -264,13 +262,18 @@ class V9TemplateRecord:
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self.template_id, self.field_count,
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self.template_id, self.field_count,
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' '.join([V9_FIELD_TYPES[field.field_type] for field in self.fields]))
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' '.join([V9_FIELD_TYPES[field.field_type] for field in self.fields]))
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class V9OptionsTemplateFlowSet:
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class V9OptionsTemplateFlowSet:
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"""An options template flowset. Always uses flowset ID 1.
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TODO: not handled at the moment, only stub implementation
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"""
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def __init__(self, data):
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def __init__(self, data):
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pack = struct.unpack('!HHH', data[:6])
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pack = struct.unpack('!HHH', data[:6])
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self.flowset_id = pack[0]
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self.flowset_id = pack[0]
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self.length = pack[1]
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self.length = pack[1]
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self.template_id = pack[2]
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self.template_id = pack[2]
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class V9TemplateFlowSet:
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class V9TemplateFlowSet:
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"""A template flowset, which holds an id that is used by data flowsets to
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"""A template flowset, which holds an id that is used by data flowsets to
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reference back to the template. The template then has fields which hold
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reference back to the template. The template then has fields which hold
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@ -348,6 +351,7 @@ class V9ExportPacket:
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skipped_flowsets_offsets = []
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skipped_flowsets_offsets = []
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while offset != len(data):
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while offset != len(data):
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flowset_id = struct.unpack('!H', data[offset:offset + 2])[0]
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flowset_id = struct.unpack('!H', data[offset:offset + 2])[0]
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if flowset_id == 0: # TemplateFlowSet always have id 0
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if flowset_id == 0: # TemplateFlowSet always have id 0
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tfs = V9TemplateFlowSet(data[offset:])
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tfs = V9TemplateFlowSet(data[offset:])
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@ -361,14 +365,13 @@ class V9ExportPacket:
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# Update the templates with the provided templates, even if they are the same
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# Update the templates with the provided templates, even if they are the same
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self._templates.update(tfs.templates)
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self._templates.update(tfs.templates)
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offset += tfs.length
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offset += tfs.length
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elif flowset_id == 1:
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otfs = V9OptionsTemplateFlowSet(data[offset:])
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if not self._new_templates:
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if otfs.template_id not in self._templates:
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self._new_templates = True
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self._templates.update({otfs.template_id: V9TemplateRecord(otfs.template_id, 0, {})})
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elif flowset_id == 1: # Option templates always use ID 1
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# TODO: Options templates are ignored, to prevent template ID collision
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# (if a collision can occur is not yet tested)
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otfs = V9OptionsTemplateFlowSet(data[offset:])
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offset += otfs.length
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offset += otfs.length
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else:
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else:
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try:
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try:
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dfs = V9DataFlowSet(data[offset:], self._templates)
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dfs = V9DataFlowSet(data[offset:], self._templates)
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