def is_dynelf(path):
    if os.path.getsize(path) <= 0:
        return False
    with open(path, 'rb') as f:
        if f.read(4) != '\x7fELF':
            return False
        #ELFCLASS32 = 1, ELFCLASS64 = 2
        wordsize = fun('B',f.read(1))*4
        wordfmt = 'Q' if wordsize == 8 else 'L'
        end = fun('B',f.read(1))
        #ELFDATA2LSB = 1, ELFDATA2MSB = 2
        end = '<' if end == 1 else '>'
        f.seek(16)
        elftype = fun(end+'H',f.read(2))
        #ET_REL = 1, ET_EXEC = 2, ET_DYN = 3
        if elftype not in range(1,4):
            return False
        # read section hdr offset
        f.seek(24+wordsize*2)
        shoff = fun(end+wordfmt,f.read(wordsize))
        # read section hdr entry size + nr. of entries
        f.seek(10, 1)
        shentsize = fun(end+'H',f.read(2))
        shnum = fun(end+'H',f.read(2))
        if shentsize < 1:
            return False
        # seek to section hdr and read entry by entry
        for i in xrange(0,shnum):
            f.seek(shoff+(i*shentsize)+4)  # 4 = sh_type off
            shenttype = fun(end+'L',f.read(4))
            # SHT_DYNAMIC = 6
            if shenttype == 6:
                return True
        return False