如何在setockopt-C，Linux中删除TCP_MD5SIG设置的授权？

Question

I have used TCP_MD5SIG to create password/key for the connection using the API - setsockopt() in C, Linux. This works fine for me. However, when I use it to remove the password/disable authorization with the same API except that the

struct_tcp_md5sig.tcm_Key = 0;
struc tcp_md5sig.tcm_keylen = 0;

I see that when I invoke the same API -

rc = setsockopt(sock_fd, IPPROTO_TCP, TCP_MD5SIG, &md5sig, sizeof(md5sig));

I see that the rc is -1. The strerror says that "no such file or directory".

I am confused on what I should do to disable the authorization. The same API works, when I pass the password. On the other hand, the same API doesn't work when I want to disable the authorization. I have enabled this protocol in the kernel. So, there is no issue with enabling of this feature in kernel.

Answer 1

AFAICT，您需要确保tcp_md5sig.tcpm_addr与注册时相同，以将其删除。