class SnmprecRecord(dump.DumpRecord):
grammar = snmprec.SnmprecGrammar()
ext = 'snmprec'
def unpackTag(self, tag):
if tag and tag[-1] == 'x':
return tag[:-1], True
else:
return tag, None
def evaluateValue(self, oid, tag, value, **context):
tag, hexvalue = self.unpackTag(tag)
if hexvalue:
hexvalue = value
try:
if hexvalue is None:
return oid, tag, self.grammar.tagMap[tag](value)
else:
return oid, tag, self.grammar.tagMap[tag](hexValue=hexvalue)
except:
raise error.SnmpsimError(
'value evaluation error for tag %r, value %r' % (tag, value))
def formatValue(self, oid, value, **context):
if 'nohex' in context and context['nohex']:
hexvalue = None
else:
hexvalue = self.grammar.hexifyValue(value)
textTag = self.grammar.getTagByType(value)
if hexvalue:
textTag, textValue = textTag + 'x', hexvalue
else:
textTag, textValue = textTag, str(value)
return self.formatOid(oid), textTag, textValue
class SnmprecRecord(dump.DumpRecord):
grammar = snmprec.SnmprecGrammar()
ext = 'snmprec'
# https://docs.python.org/3/reference/lexical_analysis.html#literals
ESCAPE_CHARS = {
92: 92,
39: 39,
34: 34,
97: 7,
98: 8,
102: 12,
110: 10,
114: 13,
116: 9,
118: 11,
}
@staticmethod
def unpackTag(tag):
if tag.endswith('x') or tag.endswith('e'):
return tag[:-1], tag[-1]
else:
return tag, None
def evaluateRawString(self, escaped):
"""Evaluates raw Python string like `ast.literal_eval` does"""
unescaped = []
hexdigit = None
escape = False
for char in escaped:
number = ord(char)
if hexdigit is not None:
if hexdigit:
number = (int(hexdigit, 16) << 4) + int(char, 16)
hexdigit = None
else:
hexdigit = char
continue
if escape:
escape = False
try:
number = self.ESCAPE_CHARS[number]
except KeyError:
if number == 120:
hexdigit = ''
continue
raise ValueError('Unknown escape character %c' % char)
if number == 92: # '\'
escape = True
continue
unescaped.append(number)
return unescaped
def evaluateValue(self, oid, tag, value, **context):
tag, encodingId = self.unpackTag(tag)
try:
if encodingId == 'e':
value = self.evaluateRawString(value)
return oid, tag, self.grammar.tagMap[tag](value)
elif encodingId == 'x':
return oid, tag, self.grammar.tagMap[tag](hexValue=value)
else:
return oid, tag, self.grammar.tagMap[tag](value)
except:
raise error.SnmpsimError(
'value evaluation error for tag %r, value %r' % (tag, value))
def formatValue(self, oid, value, **context):
if 'nohex' in context and context['nohex']:
hexvalue = None
else:
hexvalue = self.grammar.hexifyValue(value)
textTag = self.grammar.getTagByType(value)
if hexvalue:
textTag, textValue = textTag + 'x', hexvalue
else:
try:
textValue = repr(value.asOctets())
if textValue.startswith('b'):
textValue = textValue[1:]
textValue = textValue[1:-1]
if '\\' in textValue:
textTag += 'e'
except AttributeError:
textValue = str(value)
return self.formatOid(oid), textTag, textValue