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.17. Other Helper Routines
These are implementation-specific, device-specific and Socket I/O routines that are provided here for completeness and full readability of code. No explanations are provided for these.
/********************************************************* NAME : get_dev_from_ip *********************************************************/ static uint32_t ifname_to_ip( char *ifname ) { struct ifreq ifr; int fd = socket(AF_INET, SOCK_DGRAM, 0); uint32_t addr = 0; if (fd < 0) return (-1); strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) == 0) { struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; addr = ntohl(sin->sin_addr.s_addr); } close(fd); return addr; } /********************************************************* ...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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