Limit readline()

analysis/classes/parsezeeklogs.py

@@ -1,178 +1,178 @@
-#!/usr/bin/env python3
-# -*- coding: utf-8 -*-
-
-from json import loads, dumps
-from collections import OrderedDict
-from datetime import datetime
-from traceback import print_exc
-
-# Taken from https://github.com/dgunter/ParseZeekLogs <3
-
-
-class ParseZeekLogs(object):
-    """
-        Class that parses Zeek logs and allows log data to be output in CSV or json format.
-        Attributes: filepath: Path of Zeek log file to read
-    """
-
-    def __init__(self, filepath, batchsize=500, fields=None, output_format=None, ignore_keys=[], meta={}, safe_headers=False):
-        self.fd = open(filepath, "r")
-        self.options = OrderedDict()
-        self.firstRun = True
-        self.filtered_fields = fields
-        self.batchsize = batchsize
-        self.output_format = output_format
-        self.ignore_keys = ignore_keys
-        self.meta = meta
-        self.safe_headers = safe_headers
-
-        # Convert ' to " in meta string
-        meta = loads(dumps(meta).replace("'", '"'))
-
-        # Read the header option lines
-        l = self.fd.readline().strip()
-        while l.strip().startswith("#"):
-            # Parse the options out
-            if l.startswith("#separator"):
-                key = str(l[1:].split(" ")[0])
-                value = str.encode(l[1:].split(
-                    " ")[1].strip()).decode('unicode_escape')
-                self.options[key] = value
-            elif l.startswith("#"):
-                key = str(l[1:].split(self.options.get('separator'))[0])
-                value = l[1:].split(self.options.get('separator'))[1:]
-                self.options[key] = value
-
-            # Read the next line
-            l = self.fd.readline().strip()
-
-        self.firstLine = l
-
-        # Save mapping of fields to values:
-        self.fields = self.options.get('fields')
-        self.types = self.options.get('types')
-
-        self.data_types = {}
-        for i, val in enumerate(self.fields):
-            # Convert field names if safe_headers is enabled
-            if self.safe_headers is True:
-                self.fields[i] = self.fields[i].replace(".", "_")
-
-            # Match types with each other
-            self.data_types[self.fields[i]] = self.types[i]
-
-    def __del__(self):
-        self.fd.close()
-
-    def __iter__(self):
-        return self
-
-    def __next__(self):
-        retVal = ""
-        if self.firstRun is True:
-            retVal = self.firstLine
-            self.firstRun = False
-        else:
-            retVal = self.fd.readline().strip()
-
-        # If an empty string is returned, readline is done reading
-        if retVal == "" or retVal is None:
-            raise StopIteration
-
-        # Split out the data we are going to return
-        retVal = retVal.split(self.options.get('separator'))
-
-        record = None
-        # Make sure we aren't dealing with a comment line
-        if len(retVal) > 0 and not str(retVal[0]).strip().startswith("#") \
-                and len(retVal) is len(self.options.get("fields")):
-            record = OrderedDict()
-            # Prepare fields for conversion
-            for x in range(0, len(retVal)):
-                if self.safe_headers is True:
-                    converted_field_name = self.options.get(
-                        "fields")[x].replace(".", "_")
-                else:
-                    converted_field_name = self.options.get("fields")[x]
-                if self.filtered_fields is None or converted_field_name in self.filtered_fields:
-                    # Translate - to "" to fix a conversation error
-                    if retVal[x] == "-":
-                        retVal[x] = ""
-                    # Save the record field if the field isn't filtered out
-                    record[converted_field_name] = retVal[x]
-
-            # Convert values to the appropriate record type
-            record = self.convert_values(
-                record, self.ignore_keys, self.data_types)
-
-            if record is not None and self.output_format == "json":
-                # Output will be json
-
-                # Add metadata to json
-                for k, v in self.meta.items():
-                    record[k] = v
-
-                retVal = record
-            elif record is not None and self.output_format == "csv":
-                retVal = ""
-                # Add escaping to csv format
-                for k, v in record.items():
-                    # Add escaping to string values
-                    if isinstance(v, str):
-                        retVal += str("\"" + str(v).strip() + "\"" + ",")
-                    else:
-                        retVal += str(str(v).strip() + ",")
-                # Remove the trailing comma
-                retVal = retVal[:-1]
-        else:
-            retVal = None
-
-        return retVal
-
-    def convert_values(self, data, ignore_keys=[], data_types={}):
-        keys_to_delete = []
-        for k, v in data.items():
-            # print("evaluating k: " + str(k) + " v: " + str(v))
-
-            if isinstance(v, dict):
-                data[k] = self.convert_values(v)
-            else:
-                if data_types.get(k) is not None:
-                    if (data_types.get(k) == "port" or data_types.get(k) == "count"):
-                        if v != "":
-                            data[k] = int(v)
-                        else:
-                            keys_to_delete.append(k)
-                    elif (data_types.get(k) == "double" or data_types.get(k) == "interval"):
-                        if v != "":
-                            data[k] = float(v)
-                        else:
-                            keys_to_delete.append(k)
-                    elif data_types.get(k) == "bool":
-                        data[k] = bool(v)
-                    else:
-                        data[k] = v
-
-        for k in keys_to_delete:
-            del data[k]
-
-        return data
-
-    def get_fields(self):
-        """Returns all fields present in the log file
-        Returns:
-            A python list containing all field names in the log file
-        """
-        field_names = ""
-        if self.output_format == "csv":
-            for i, v in enumerate(self.fields):
-                if self.filtered_fields is None or v in self.filtered_fields:
-                    field_names += str(v) + ","
-            # Remove the trailing comma
-            field_names = field_names[:-1].strip()
-        else:
-            field_names = []
-            for i, v in enumerate(self.fields):
-                if self.filtered_fields is None or v in self.filtered_fields:
-                    field_names.append(v)
-        return field_names
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from json import loads, dumps
+from collections import OrderedDict
+from datetime import datetime
+from traceback import print_exc
+
+# Taken from https://github.com/dgunter/ParseZeekLogs <3
+
+
+class ParseZeekLogs(object):
+    """
+        Class that parses Zeek logs and allows log data to be output in CSV or json format.
+        Attributes: filepath: Path of Zeek log file to read
+    """
+
+    def __init__(self, filepath, batchsize=500, fields=None, output_format=None, ignore_keys=[], meta={}, safe_headers=False):
+        self.fd = open(filepath, "r")
+        self.options = OrderedDict()
+        self.firstRun = True
+        self.filtered_fields = fields
+        self.batchsize = batchsize
+        self.output_format = output_format
+        self.ignore_keys = ignore_keys
+        self.meta = meta
+        self.safe_headers = safe_headers
+
+        # Convert ' to " in meta string
+        meta = loads(dumps(meta).replace("'", '"'))
+
+        # Read the header option lines
+        l = self.fd.readline(5_000_000).strip()
+        while l.strip().startswith("#"):
+            # Parse the options out
+            if l.startswith("#separator"):
+                key = str(l[1:].split(" ")[0])
+                value = str.encode(l[1:].split(
+                    " ")[1].strip()).decode('unicode_escape')
+                self.options[key] = value
+            elif l.startswith("#"):
+                key = str(l[1:].split(self.options.get('separator'))[0])
+                value = l[1:].split(self.options.get('separator'))[1:]
+                self.options[key] = value
+
+            # Read the next line
+            l = self.fd.readline(5_000_000).strip()
+
+        self.firstLine = l
+
+        # Save mapping of fields to values:
+        self.fields = self.options.get('fields')
+        self.types = self.options.get('types')
+
+        self.data_types = {}
+        for i, val in enumerate(self.fields):
+            # Convert field names if safe_headers is enabled
+            if self.safe_headers is True:
+                self.fields[i] = self.fields[i].replace(".", "_")
+
+            # Match types with each other
+            self.data_types[self.fields[i]] = self.types[i]
+
+    def __del__(self):
+        self.fd.close()
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        retVal = ""
+        if self.firstRun is True:
+            retVal = self.firstLine
+            self.firstRun = False
+        else:
+            retVal = self.fd.readline().strip()
+
+        # If an empty string is returned, readline is done reading
+        if retVal == "" or retVal is None:
+            raise StopIteration
+
+        # Split out the data we are going to return
+        retVal = retVal.split(self.options.get('separator'))
+
+        record = None
+        # Make sure we aren't dealing with a comment line
+        if len(retVal) > 0 and not str(retVal[0]).strip().startswith("#") \
+                and len(retVal) is len(self.options.get("fields")):
+            record = OrderedDict()
+            # Prepare fields for conversion
+            for x in range(0, len(retVal)):
+                if self.safe_headers is True:
+                    converted_field_name = self.options.get(
+                        "fields")[x].replace(".", "_")
+                else:
+                    converted_field_name = self.options.get("fields")[x]
+                if self.filtered_fields is None or converted_field_name in self.filtered_fields:
+                    # Translate - to "" to fix a conversation error
+                    if retVal[x] == "-":
+                        retVal[x] = ""
+                    # Save the record field if the field isn't filtered out
+                    record[converted_field_name] = retVal[x]
+
+            # Convert values to the appropriate record type
+            record = self.convert_values(
+                record, self.ignore_keys, self.data_types)
+
+            if record is not None and self.output_format == "json":
+                # Output will be json
+
+                # Add metadata to json
+                for k, v in self.meta.items():
+                    record[k] = v
+
+                retVal = record
+            elif record is not None and self.output_format == "csv":
+                retVal = ""
+                # Add escaping to csv format
+                for k, v in record.items():
+                    # Add escaping to string values
+                    if isinstance(v, str):
+                        retVal += str("\"" + str(v).strip() + "\"" + ",")
+                    else:
+                        retVal += str(str(v).strip() + ",")
+                # Remove the trailing comma
+                retVal = retVal[:-1]
+        else:
+            retVal = None
+
+        return retVal
+
+    def convert_values(self, data, ignore_keys=[], data_types={}):
+        keys_to_delete = []
+        for k, v in data.items():
+            # print("evaluating k: " + str(k) + " v: " + str(v))
+
+            if isinstance(v, dict):
+                data[k] = self.convert_values(v)
+            else:
+                if data_types.get(k) is not None:
+                    if (data_types.get(k) == "port" or data_types.get(k) == "count"):
+                        if v != "":
+                            data[k] = int(v)
+                        else:
+                            keys_to_delete.append(k)
+                    elif (data_types.get(k) == "double" or data_types.get(k) == "interval"):
+                        if v != "":
+                            data[k] = float(v)
+                        else:
+                            keys_to_delete.append(k)
+                    elif data_types.get(k) == "bool":
+                        data[k] = bool(v)
+                    else:
+                        data[k] = v
+
+        for k in keys_to_delete:
+            del data[k]
+
+        return data
+
+    def get_fields(self):
+        """Returns all fields present in the log file
+        Returns:
+            A python list containing all field names in the log file
+        """
+        field_names = ""
+        if self.output_format == "csv":
+            for i, v in enumerate(self.fields):
+                if self.filtered_fields is None or v in self.filtered_fields:
+                    field_names += str(v) + ","
+            # Remove the trailing comma
+            field_names = field_names[:-1].strip()
+        else:
+            field_names = []
+            for i, v in enumerate(self.fields):
+                if self.filtered_fields is None or v in self.filtered_fields:
+                    field_names.append(v)
+        return field_names