I use Linux, and I create specific application. I use raw socket. And, when I open it and recv(...), I get packets, wich were went earler, and, how I guess, were buffered in kernel, or network card driver. But I don't need them. I need only packets, wich went after I opened socket. Ofcource, I can drop this packets, but I don't know how many packets I need drop, because each time quantity of packets is different. How create this socket? Is it possible?
我使用Linux，并创建特定的应用程序。我使用原始套接字。而且，当我打开它并recv（...）时，我收到了数据包，这些数据包已经过了，而且，我猜测，是在内核或网卡驱动程序中缓存的。但我不需要它们。我只需要数据包，我打开套接字后就去了。 Ofcource，我可以丢弃这些数据包，但我不知道需要丢弃多少数据包，因为每次数据包的数量都不同。如何创建这个套接字？可能吗？
1 个解决方案
#1
3
Depends on how you've negotiated the host/port to communicate on, and do you have control over whatever is sending these packets?
取决于您如何协商主机/端口进行通信，您是否可以控制发送这些数据包的内容？
You could:
你可以：
1) Immediately after opening the socket, do a recv() loop (with flags=MSG_DONTWAIT) and ignore every packet assuming that it was stale, ending the loop as soon as recv() returns <=0 bytes (it should set errno to EWOULDBLOCK to indicate that there was nothing left to read too, otherwise the cause could be another socket-related issue)
1）打开套接字后，立即执行一个recv（）循环（带有flags = MSG_DONTWAIT）并忽略每个数据包，假设它是陈旧的，一旦recv（）返回<= 0字节就结束循环（它应该将errno设置为EWOULDBLOCK表示没有什么东西可以读取，否则原因可能是另一个与套接字相关的问题）
2) Negotiate a new port each time
2）每次协商一个新的端口
3) Add a custom header to your packets (e.g. first N bits) to indicate e.g. sequence number, or a special "new connection" code, or a timestamp. This usage really depends on what you're doing on both ends of this raw socket.
3）向数据包添加自定义标头（例如，前N位）以指示例如序列号，或特殊的“新连接”代码或时间戳。这种用法实际上取决于你在这个原始套接字的两端做了什么。
#1
3
Depends on how you've negotiated the host/port to communicate on, and do you have control over whatever is sending these packets?
取决于您如何协商主机/端口进行通信，您是否可以控制发送这些数据包的内容？
You could:
你可以：
1) Immediately after opening the socket, do a recv() loop (with flags=MSG_DONTWAIT) and ignore every packet assuming that it was stale, ending the loop as soon as recv() returns <=0 bytes (it should set errno to EWOULDBLOCK to indicate that there was nothing left to read too, otherwise the cause could be another socket-related issue)
1）打开套接字后，立即执行一个recv（）循环（带有flags = MSG_DONTWAIT）并忽略每个数据包，假设它是陈旧的，一旦recv（）返回<= 0字节就结束循环（它应该将errno设置为EWOULDBLOCK表示没有什么东西可以读取，否则原因可能是另一个与套接字相关的问题）
2) Negotiate a new port each time
2）每次协商一个新的端口
3) Add a custom header to your packets (e.g. first N bits) to indicate e.g. sequence number, or a special "new connection" code, or a timestamp. This usage really depends on what you're doing on both ends of this raw socket.
3）向数据包添加自定义标头（例如，前N位）以指示例如序列号，或特殊的“新连接”代码或时间戳。这种用法实际上取决于你在这个原始套接字的两端做了什么。