mirror of
https://github.com/cea-sec/miasm
synced 2026-06-21 13:48:18 +00:00
Fabrice Desclaux
62 lines
1.4 KiB
Python
62 lines
1.4 KiB
Python
"""
|
|
Parse C expression to access variables and retrieve information:
|
|
* Miasm expression to access this variable
|
|
* variable type
|
|
"""
|
|
|
|
from miasm2.core.ctypesmngr import CTypeStruct, CAstTypes, CTypePtr
|
|
from miasm2.arch.x86.ctype import CTypeAMD64_unk
|
|
from miasm2.core.objc import CTypesManagerNotPacked, CHandler
|
|
from miasm2.expression.expression import ExprId
|
|
|
|
|
|
"""
|
|
C manipulation example
|
|
"""
|
|
|
|
# Digest C informations
|
|
text = """
|
|
struct line {
|
|
char color[20];
|
|
int size;
|
|
};
|
|
|
|
struct rectangle {
|
|
unsigned int width;
|
|
unsigned int length;
|
|
struct line* line;
|
|
};
|
|
"""
|
|
|
|
# Type manager for x86 64: structures not packed
|
|
base_types = CTypeAMD64_unk()
|
|
types_ast = CAstTypes()
|
|
|
|
# Add C types definition
|
|
types_ast.add_c_decl(text)
|
|
|
|
types_mngr = CTypesManagerNotPacked(types_ast, base_types)
|
|
|
|
# Create the ptr variable with type "struct rectangle*"
|
|
ptr_rectangle = types_mngr.get_objc(CTypePtr(CTypeStruct('rectangle')))
|
|
|
|
ptr = ExprId('ptr', 64)
|
|
c_context = {ptr.name: ptr_rectangle}
|
|
mychandler = CHandler(types_mngr, {})
|
|
|
|
# Parse some C accesses
|
|
c_acceses = ["ptr->width",
|
|
"ptr->length",
|
|
"ptr->line",
|
|
"ptr->line->color",
|
|
"ptr->line->color[3]",
|
|
"ptr->line->size"
|
|
]
|
|
|
|
for c_str in c_acceses:
|
|
expr = mychandler.c_to_expr(c_str, c_context)
|
|
c_type = mychandler.c_to_type(c_str, c_context)
|
|
print 'C access:', c_str
|
|
print '\tExpr:', expr
|
|
print '\tType:', c_type
|