Hi, I don't know if this solves the problem, but you must initialize peer_len with sizeof(peer_addr) before calling getpeername.
Also, it is possible that the peer address is not an IPv4 address. You should better use sockaddr_storage instead of sockaddr_in and check peer_addr.ss_family. Best regards Simon -----Ursprüngliche Nachricht----- Von: zeromq-dev <zeromq-dev-boun...@lists.zeromq.org> Im Auftrag von Yan, Liming (NSB - CN/Hangzhou) Gesendet: Mittwoch, 24. Oktober 2018 04:25 An: zeromq-dev@lists.zeromq.org Betreff: Re: [zeromq-dev] getpeername() couldn't resolve the peer address with underlying fd achieved from zmq_socket_monitor ZMQ_EVENT_ACCEPTED event? HI, Could anybody respond to this issue? BR Yan Limin _____________________________________________ From: Yan, Liming (NSB - CN/Hangzhou) Sent: Tuesday, October 16, 2018 4:49 PM To: 'zeromq-dev@lists.zeromq.org' <zeromq-dev@lists.zeromq.org> Subject: getpeername() couldn't resolve the peer address with underlying fd achieved from zmq_socket_monitor ZMQ_EVENT_ACCEPTED event? Hi, I created a monitor on a router socket and monitor the ZMQ_EVENT_ACCEPTED event. Each time when a new client accepted, I can get the event and underlying fd. The code is just as the example in page https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fapi.zeromq.org%2F4-1%3Azmq-socket-monitor&data=02%7C01%7Csimon.giesecke%40btc-ag.com%7Ccb41745a80fc4815d0d808d63957f56e%7Cc064efb078954eebb406a40bc377bc7d%7C0%7C0%7C636759447274350077&sdata=a0%2BSyH05OinbAGsIx5whElJ9d%2FlMqDA4LEaiq4AA8jE%3D&reserved=0 . Then I need to use getpeername to know who is the peer ip address. But this seems not work. I can only get 0.0.0.0. Does this underlying fd provided by monitor support getpeername()? Or anything wrong with me? Thanks. { char ip[128]; struct sockaddr_in peer_addr; unsigned int peer_len; int ret, fd = (int)monitor_event->value; ret = getpeername(fd, (struct sockaddr *)&peer_addr, &peer_len); if (ret == -1) { printf("Get peer name failed. fd=%d. err=%d:%s.\n", fd, errno, strerror(errno)); } else { inet_ntop(AF_INET, &peer_addr.sin_addr, ip, sizeof(ip)); printf("New client accepted: %s:%d. Local socket:%s. fd=%d.\n", ip, ntohs(peer_addr.sin_port), monitor_event->socket_addr, fd); } } New client accepted: 0.0.0.0:29186. Local socket:tcp://169.254.0.10:48000. fd=34. ZMQ_EVENT_ACCEPTED The socket has accepted a connection from a remote peer. The event value is the FD of the underlying network socket. Warning: there is no guarantee that the FD is still valid by the time your code receives this event. BR Yan Limin _______________________________________________ zeromq-dev mailing list zeromq-dev@lists.zeromq.org https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.zeromq.org%2Fmailman%2Flistinfo%2Fzeromq-dev&data=02%7C01%7Csimon.giesecke%40btc-ag.com%7Ccb41745a80fc4815d0d808d63957f56e%7Cc064efb078954eebb406a40bc377bc7d%7C0%7C0%7C636759447274350077&sdata=C9DGVZ62v%2F2w3ynVrzldljyF0wX7WcBVseVw6c6KfEg%3D&reserved=0 _______________________________________________ zeromq-dev mailing list zeromq-dev@lists.zeromq.org https://lists.zeromq.org/mailman/listinfo/zeromq-dev
