September 2002
Intermediate to advanced
560 pages
13h 16m
English
book
VRRP: Increasing Reliability and Failover with the Virtual Router Redundance Protocol
by Ayikudy Srikanth, Adnan Adam Onart
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C.14. Joining the Multicast Group
/********************************************************* NAME : open_sock *********************************************************/ static int open_sock( vrrp_rt *vsrv ) { struct ip_mreq req; int ret; /* open the socket */ vsrv->sockfd = socket( AF_INET, SOCK_RAW, IPPROTO_VRRP ); if( vsrv->sockfd < 0 ){ int err = errno; VRRP_LOG(("cant open raw socket. errno=%d. (try to run it as root)\n" , err)); return -1; } /* join the multicast group */ memset( &req, 0, sizeof (req)); req.imr_multiaddr.s_addr = htonl(INADDR_VRRP_GROUP); req.imr_interface.s_addr = htonl(vsrv->vif.ipaddr); ret = setsockopt (vsrv->sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *) &req, sizeof (struct ip_mreq)); if( ret < 0 ){ int err = errno; ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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