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50 lines
1.3 KiB
Python
50 lines
1.3 KiB
Python
#!/usr/bin/env python
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"""
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$Id$
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Copyright (c) 2006-2011 sqlmap developers (http://sqlmap.sourceforge.net/)
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See the file 'doc/COPYING' for copying permission
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"""
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from lib.core.enums import PRIORITY
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__priority__ = PRIORITY.HIGHEST
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def tamper(payload):
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"""
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Replaces 'IFNULL(A, B)' with 'IF(ISNULL(A), B, A)'
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Example: 'IFNULL(1, 2)' becomes 'IF(ISNULL(1), 2, 1)'
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"""
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if payload and payload.find("IFNULL") > -1:
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while payload.find("IFNULL(") > -1:
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index = payload.find("IFNULL(")
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deepness = 1
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comma, end = None, None
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for i in xrange(index + len("IFNULL("), len(payload)):
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if deepness == 1 and payload[i] == ',':
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comma = i
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elif deepness == 1 and payload[i] == ')':
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end = i
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break
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elif payload[i] == '(':
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deepness += 1
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elif payload[i] == ')':
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deepness -= 1
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if comma and end:
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A = payload[index + len("IFNULL("):comma]
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B = payload[comma + 1:end]
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newVal = "IF(ISNULL(%s),%s,%s)" % (A, B, A)
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payload = payload[:index] + newVal + payload[end+1:]
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else:
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break
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return payload
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