从网上找的 ping 源代码

                # examine packet
                # fetch TTL from IP header
                if ipv6:
                    # since IPv6 header and any extension header are never passed
                    # to a raw socket, we can *not* get hoplimit field..
                    # I hoped that a socket option would help, but it's not
                    # supported:
                    #   pingSocket.setsockopt(IPPROTO_IPV6, IPV6_RECVHOPLIMIT, 1)
                    # so we can't fetch hoplimit..

                    # fetch hoplimit
                    #rawPongHop = struct.unpack("c", pong[7])[0]

                    # fetch pong header
                    pongHeader = pong[0:8]
                    pongType, pongCode, pongChksum, pongID, pongSeqnr = \
                              struct.unpack("bbHHh", pongHeader)

                    # fetch starttime from pong
                    starttime = struct.unpack("d", pong[8:16])[0]

                # IPv4

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TAG标签:	源代码 网上 _error size print else: node str packet