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from argparse import ArgumentParser
from pdb import pm
from pprint import pprint
from miasm2.expression.expression import get_expr_mem
from miasm2.arch.x86.ira import ir_a_x86_32
from miasm2.arch.x86.disasm import dis_x86_32
from miasm2.analysis.data_analysis import intra_bloc_flow_raw, inter_bloc_flow
from miasm2.core.graph import DiGraph
from miasm2.ir.symbexec import symbexec
parser = ArgumentParser("Simple expression use for generating dataflow graph")
parser.add_argument("filename", help="File to analyse")
parser.add_argument("addr", help="Function's address")
parser.add_argument("-s", "--symb", help="Symbolic execution mode",
action="store_true")
args = parser.parse_args()
def node_x_2_id(n, x):
return hash(str(n) + str(x)) & 0xffffffffffffffff
def get_node_name(label, i, n):
n_name = (label.name, i, n)
return n_name
def get_modified_symbols(sb):
# Get modified IDS
ids = sb.symbols.symbols_id.keys()
ids.sort()
out = {}
regs_init = sb.ir_arch.arch.regs.regs_init
for i in ids:
if i in regs_init and \
i in sb.symbols.symbols_id and \
sb.symbols.symbols_id[i] == regs_init[i]:
continue
out[i] = sb.symbols.symbols_id[i]
# Get mem IDS
mems = sb.symbols.symbols_mem.values()
for m, v in mems:
print m, v
out[m] = v
pprint([(str(x[0]), str(x[1])) for x in out.items()])
return out
def intra_bloc_flow_symb(ir_arch, flow_graph, irbloc):
symbols_init = ir_arch.arch.regs.regs_init.copy()
sb = symbexec(ir_arch, symbols_init)
sb.emulbloc(irbloc)
print '*' * 40
print irbloc
in_nodes = {}
out_nodes = {}
out = get_modified_symbols(sb)
current_nodes = {}
# Gen mem arg to mem node links
for dst, src in out.items():
for n in [dst, src]:
all_mems = set()
all_mems.update(get_expr_mem(n))
for n in all_mems:
node_n_w = get_node_name(irbloc.label, 0, n)
if not n == src:
continue
o_r = n.arg.get_r(mem_read=False, cst_read=True)
for i, n_r in enumerate(o_r):
if n_r in current_nodes:
node_n_r = current_nodes[n_r]
else:
node_n_r = get_node_name(irbloc.label, i, n_r)
if not n_r in in_nodes:
in_nodes[n_r] = node_n_r
flow_graph.add_uniq_edge(node_n_r, node_n_w)
# Gen data flow links
for dst, src in out.items():
nodes_r = src.get_r(mem_read=False, cst_read=True)
nodes_w = set([dst])
for n_r in nodes_r:
if n_r in current_nodes:
node_n_r = current_nodes[n_r]
else:
node_n_r = get_node_name(irbloc.label, 0, n_r)
if not n_r in in_nodes:
in_nodes[n_r] = node_n_r
flow_graph.add_node(node_n_r)
for n_w in nodes_w:
node_n_w = get_node_name(irbloc.label, 1, n_w)
out_nodes[n_w] = node_n_w
flow_graph.add_node(node_n_w)
flow_graph.add_uniq_edge(node_n_r, node_n_w)
irbloc.in_nodes = in_nodes
irbloc.out_nodes = out_nodes
def node2str(self, node):
out = "%s,%s\\l\\\n%s" % node
return out
def gen_bloc_data_flow_graph(ir_arch, ad, block_flow_cb):
for irbloc in ir_arch.blocs.values():
print irbloc
ir_arch.dead_simp()
irbloc_0 = None
for irbloc in ir_arch.blocs.values():
if irbloc.label.offset == ad:
irbloc_0 = irbloc
break
assert(irbloc_0 is not None)
flow_graph = DiGraph()
flow_graph.node2str = lambda n: node2str(flow_graph, n)
for irbloc in ir_arch.blocs.values():
block_flow_cb(ir_arch, flow_graph, irbloc)
for irbloc in ir_arch.blocs.values():
print irbloc
print 'IN', [str(x) for x in irbloc.in_nodes]
print 'OUT', [str(x) for x in irbloc.out_nodes]
print '*' * 20, 'interbloc', '*' * 20
inter_bloc_flow(ir_arch, flow_graph, irbloc_0.label)
# from graph_qt import graph_qt
# graph_qt(flow_graph)
open('data.dot', 'w').write(flow_graph.dot())
data = open(args.filename).read()
ad = int(args.addr, 16)
print 'disasm...'
mdis = dis_x86_32(data)
mdis.follow_call = True
ab = mdis.dis_multibloc(ad)
print 'ok'
print 'generating dataflow graph for:'
ir_arch = ir_a_x86_32(mdis.symbol_pool)
blocs = ab
for bloc in blocs:
print bloc
ir_arch.add_bloc(bloc)
for irbloc in ir_arch.blocs.values():
print irbloc
if irbloc.label.offset != 0:
continue
if args.symb:
block_flow_cb = intra_bloc_flow_symb
else:
block_flow_cb = intra_bloc_flow_raw
gen_bloc_data_flow_graph(ir_arch, ad, block_flow_cb)
print '*' * 40
print """
View with:
dotty dataflow.dot
or
Generate ps with pdf:
dot -Tps dataflow_xx.dot -o graph.ps
"""
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