linux.py 文件源码

def read_routes():
    f=open("/proc/net/route","r")
    routes = []
    s=socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    ifreq = ioctl(s, SIOCGIFADDR,struct.pack("16s16x",LOOPBACK_NAME))
    addrfamily = struct.unpack("h",ifreq[16:18])[0]
    if addrfamily == socket.AF_INET:
        ifreq2 = ioctl(s, SIOCGIFNETMASK,struct.pack("16s16x",LOOPBACK_NAME))
        msk = socket.ntohl(struct.unpack("I",ifreq2[20:24])[0])
        dst = socket.ntohl(struct.unpack("I",ifreq[20:24])[0]) & msk
        ifaddr = scapy.utils.inet_ntoa(ifreq[20:24])
        routes.append((dst, msk, "0.0.0.0", LOOPBACK_NAME, ifaddr))
    else:
        warning("Interface lo: unkown address family (%i)"% addrfamily)

    for l in f.readlines()[1:]:
        iff,dst,gw,flags,x,x,x,msk,x,x,x = l.split()
        flags = int(flags,16)
        if flags & RTF_UP == 0:
            continue
        if flags & RTF_REJECT:
            continue
        try:
            ifreq = ioctl(s, SIOCGIFADDR,struct.pack("16s16x",iff))
        except IOError: # interface is present in routing tables but does not have any assigned IP
            ifaddr="0.0.0.0"
        else:
            addrfamily = struct.unpack("h",ifreq[16:18])[0]
            if addrfamily == socket.AF_INET:
                ifaddr = scapy.utils.inet_ntoa(ifreq[20:24])
            else:
                warning("Interface %s: unkown address family (%i)"%(iff, addrfamily))
                continue
        routes.append((socket.htonl(long(dst,16))&0xffffffffL,
                       socket.htonl(long(msk,16))&0xffffffffL,
                       scapy.utils.inet_ntoa(struct.pack("I",long(gw,16))),
                       iff, ifaddr))

    f.close()
    return routes

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### IPv6 ###
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