Get a pointer to an IPv6 address in the routing header
#include <netinet/in.h> struct in6_addr * inet6_rthdr_getaddr( struct cmsghdr *cmsg, int index);
- A pointer to the Ancillary data containing the routing header.
- A value between 0 and the number returned by inet6_rthdr_segments().
Use the -l socket option to qcc to link against this library.
This function returns a pointer to the IPv6 address specified by index in the routing header described by cmsg. The index must have a value between 1 and the number returned by inet6_rthdr_segments(). You should first call inet6_rthdr_segments() to obtain the number of segments in the Routing header.
For more information, see:
- W. Stevens and M. Thomas, Advanced Sockets API for IPv6, RFC 2292, February 1998. Contains good examples.
- S. Deering and R. Hinden, Internet Protocol, Version 6 (IPv6) Specification, RFC 2460, December 1998.
A pointer to the IPv6 address, or NULL if an error occured.