mirror of
https://github.com/cea-sec/miasm
synced 2026-06-21 13:48:18 +00:00
Aymeric Vincent
5dbf046bbe
Use Python's int(s, 0) to allow string "s" to specify its base where addresses and offsets can be supplied. This change makes the situation homogeneous among the various examples and interactive usage.
204 lines
6.3 KiB
Python
204 lines
6.3 KiB
Python
import os
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import logging
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from argparse import ArgumentParser
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from pdb import pm
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from miasm2.analysis.binary import Container
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from miasm2.core.asmbloc import log_asmbloc, asm_label, bloc2graph
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from miasm2.expression.expression import ExprId
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from miasm2.core.interval import interval
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from miasm2.analysis.machine import Machine
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log = logging.getLogger("dis")
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console_handler = logging.StreamHandler()
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console_handler.setFormatter(logging.Formatter("%(levelname)-5s: %(message)s"))
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log.addHandler(console_handler)
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log.setLevel(logging.INFO)
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filename = os.environ.get('PYTHONSTARTUP')
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if filename and os.path.isfile(filename):
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execfile(filename)
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parser = ArgumentParser("Disassemble a binary")
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parser.add_argument('filename', help="File to disassemble")
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parser.add_argument('address', help="Starting address for disassembly engine",
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nargs="*")
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parser.add_argument('-m', '--architecture', help="architecture: " + \
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",".join(Machine.available_machine()))
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parser.add_argument('-f', "--followcall", action="store_true",
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help="Follow call instructions")
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parser.add_argument('-b', "--blockwatchdog", default=None, type=int,
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help="Maximum number of basic block to disassemble")
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parser.add_argument('-n', "--funcswatchdog", default=None, type=int,
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help="Maximum number of function to disassemble")
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parser.add_argument('-r', "--recurfunctions", action="store_true",
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help="Disassemble founded functions")
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parser.add_argument('-v', "--verbose", action="store_true", help="Verbose mode")
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parser.add_argument('-g', "--gen_ir", action="store_true",
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help="Compute the intermediate representation")
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parser.add_argument('-z', "--dis-nulstart-block", action="store_true",
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help="Do not disassemble NULL starting block")
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parser.add_argument('-l', "--dontdis-retcall", action="store_true",
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help="If set, disassemble only call destinations")
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parser.add_argument('-s', "--simplify", action="store_true",
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help="Use the liveness analysis pass")
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parser.add_argument('-o', "--shiftoffset", default=None,
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type=lambda x: int(x, 0),
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help="Shift input binary by an offset")
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parser.add_argument('-a', "--try-disasm-all", action="store_true",
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help="Try to disassemble the whole binary")
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parser.add_argument('-i', "--image", action="store_true",
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help="Display image representation of disasm")
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args = parser.parse_args()
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if args.verbose:
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log_asmbloc.setLevel(logging.DEBUG)
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log.info('Load binary')
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with open(args.filename) as fdesc:
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cont = Container.from_stream(fdesc, addr=args.shiftoffset)
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default_addr = cont.entry_point
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bs = cont.bin_stream
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e = cont.executable
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log.info('ok')
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log.info("import machine...")
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# Use the guessed architecture or the specified one
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arch = args.architecture if args.architecture else cont.arch
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if not arch:
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print "Architecture recognition fail. Please specify it in arguments"
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exit(-1)
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# Instance the arch-dependent machine
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machine = Machine(arch)
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mn, dis_engine = machine.mn, machine.dis_engine
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ira, ir = machine.ira, machine.ir
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log.info('ok')
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mdis = dis_engine(bs)
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# configure disasm engine
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mdis.dontdis_retcall = args.dontdis_retcall
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mdis.blocs_wd = args.blockwatchdog
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mdis.dont_dis_nulstart_bloc = not args.dis_nulstart_block
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mdis.follow_call = args.followcall
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todo = []
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addrs = [int(a, 0) for a in args.address]
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if len(addrs) == 0 and default_addr is not None:
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addrs.append(default_addr)
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for ad in addrs:
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todo += [(mdis, None, ad)]
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done = set()
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all_funcs = set()
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all_funcs_blocs = {}
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done_interval = interval()
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finish = False
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# Main disasm loop
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while not finish and todo:
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while not finish and todo:
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mdis, caller, ad = todo.pop(0)
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if ad in done:
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continue
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done.add(ad)
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ab = mdis.dis_multibloc(ad)
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log.info('func ok %.16x (%d)' % (ad, len(all_funcs)))
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all_funcs.add(ad)
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all_funcs_blocs[ad] = ab
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for b in ab:
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for l in b.lines:
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done_interval += interval([(l.offset, l.offset + l.l)])
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if args.funcswatchdog is not None:
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args.funcswatchdog -= 1
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if args.recurfunctions:
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for b in ab:
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i = b.get_subcall_instr()
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if not i:
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continue
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for d in i.getdstflow(mdis.symbol_pool):
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if not (isinstance(d, ExprId) and isinstance(d.name, asm_label)):
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continue
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todo.append((mdis, i, d.name.offset))
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if args.funcswatchdog is not None and args.funcswatchdog <= 0:
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finish = True
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if args.try_disasm_all:
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for a, b in done_interval.intervals:
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if b in done:
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continue
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log.debug('add func %s' % hex(b))
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todo.append((mdis, None, b))
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# Generate dotty graph
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all_blocs = []
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for blocs in all_funcs_blocs.values():
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all_blocs += blocs
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# for b in blocs:
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# print b
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log.info('generate graph file')
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g = bloc2graph(all_blocs, True)
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open('graph_execflow.txt', 'w').write(g)
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log.info('generate intervals')
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all_lines = []
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total_l = 0
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print done_interval
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if args.image:
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log.info('build img')
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done_interval.show()
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for i, j in done_interval.intervals:
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log.debug((hex(i), "->", hex(j)))
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all_lines.sort(key=lambda x: x.offset)
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open('lines.txt', 'w').write('\n'.join([str(l) for l in all_lines]))
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log.info('total lines %s' % total_l)
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# Bonus, generate IR graph
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if args.gen_ir:
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log.info("generating IR and IR analysis")
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ir_arch = ir(mdis.symbol_pool)
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ir_arch_a = ira(mdis.symbol_pool)
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ir_arch.blocs = {}
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ir_arch_a.blocs = {}
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for ad, all_bloc in all_funcs_blocs.items():
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log.info("generating IR... %x" % ad)
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for b in all_bloc:
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ir_arch_a.add_bloc(b)
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ir_arch.add_bloc(b)
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log.info("Print blocs (without analyse)")
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for label, bloc in ir_arch.blocs.iteritems():
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print bloc
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log.info("Gen Graph... %x" % ad)
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log.info("Print blocs (with analyse)")
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for label, bloc in ir_arch_a.blocs.iteritems():
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print bloc
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ir_arch_a.gen_graph()
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if args.simplify:
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ir_arch_a.dead_simp()
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out = ir_arch_a.graph()
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open('graph_irflow.txt', 'w').write(out)
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