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How to get IPv6 address using getifaddrs and which version of glibc supports


Hi

Our set up is Linux 2.4.20 version kernel and glibc 2.3.2.-11.9

We were trying to get the ipv6 address using getifaddrs as give bellow


#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <ifaddrs.h>
#include <errno.h>

int
main(int argc, char *argv[])
{
struct ifaddrs *myaddrs, *ifa;
struct sockaddr_in *s4;
struct sockaddr_in6 *s6;
int status;
/* buf must be big enough for an IPv6 address (e.g. 3ffe:2fa0:1010:ca22:020a:95ff:fe8a:1cf8) */
char buf[64];

status = getifaddrs(&myaddrs);
if (status != 0)
{
perror("getifaddrs");
exit(1);
}

for (ifa = myaddrs; ifa != NULL; ifa = ifa->ifa_next)
{
if (ifa->ifa_addr == NULL) continue;
if ((ifa->ifa_flags & IFF_UP) == 0) continue;

if (ifa->ifa_addr->sa_family == AF_INET)
{
s4 = (struct sockaddr_in *)(ifa->ifa_addr);
if (inet_ntop(ifa->ifa_addr->sa_family, (void *)&(s4->sin_addr), buf, sizeof(buf)) == NULL)
{
printf("%s: inet_ntop failed!\n", ifa->ifa_name);
}
else
{
printf("%s: %s\n", ifa->ifa_name, buf);
}
}
else if (ifa->ifa_addr->sa_family == AF_INET6)
{
s6 = (struct sockaddr_in6 *)(ifa->ifa_addr);
if (inet_ntop(ifa->ifa_addr->sa_family, (void *)&(s6->sin6_addr), buf, sizeof(buf)) == NULL)
{
printf("%s: inet_ntop failed!\n", ifa->ifa_name);
}
else
{
printf("%s: %s\n", ifa->ifa_name, buf);
}
}
}

freeifaddrs(myaddrs);
exit(0);
}

we can able to get only Ipv4 addresses from interface.

I came to know from mailing list getifaddrs() in glibc 2.3 doesnt support Ipv6

please tell us which version of glibc supports getifaddrs() for getting Ipv6 addresses.

cheers,
Srini

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