utils.py 文件源码

def __init__(self, filename):
        self.filename = filename
        try:
            if not stat.S_ISREG(os.stat(filename).st_mode):
              raise IOError("GZIP detection works only for regular files")
            self.f = gzip.open(filename,"rb")
            magic = self.f.read(4)
        except IOError:
            self.f = open(filename,"rb")
            magic = self.f.read(4)
        if magic == b"\xa1\xb2\xc3\xd4": #big endian
            self.endian = ">"
            self.reader = _RawPcapOldReader(self.f, self.endian)
        elif magic == b"\xd4\xc3\xb2\xa1": #little endian
            self.endian = "<"
            self.reader = _RawPcapOldReader(self.f, self.endian)
        elif magic == b"\x0a\x0d\x0d\x0a": #PcapNG
            self.reader = _RawPcapNGReader(self.f) 
        else:
            raise Scapy_Exception("Not a pcap capture file (bad magic)")