[lwip-devel] [task #15393] Support scoped literal IPv6 addresses in getaddrinfo

[Ashley Duncan]

Follow-up Comment #4, task #15393 (project lwip):

Yes, correct.  getaddrinfo works as expected under linux.  For example:

#include <iostream>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>

int main(int argc, char **argv)
{
    struct addrinfo hints = {0};
    struct addrinfo * res = NULL;
    if (getaddrinfo("fe80::8831:ba34:ba2e:667f%wlp5s0", "1234", &hints, &res)
== 0)
    {
        struct addrinfo * info = res;
        while (info)
        {
            if (info->ai_family == AF_INET6)
            {
                struct sockaddr_in6 * pI6 = (struct sockaddr_in6
*)info->ai_addr;
                                if (IN6_IS_ADDR_LINKLOCAL(&(pI6->sin6_addr)))
                                {
                    char buf[64];
                                        printf("IP6 Addr: %s%%%d\n", 
inet_ntop(AF_INET6, &pI6->sin6_addr, buf,
sizeof(buf)), pI6->sin6_scope_id);
                                }
            }
            info = info->ai_next;
        }
    }
    freeaddrinfo(res);
    return 0;
}

Gives the following result for "fe80::8831:ba34:ba2e:667f%wlp5s0" :

IP6 Addr: fe80::8831:ba34:ba2e:667f%3
IP6 Addr: fe80::8831:ba34:ba2e:667f%3
IP6 Addr: fe80::8831:ba34:ba2e:667f%3

Or for "fe80::a8e0:d579:be00:72ab%enp4s0" :
IP6 Addr: fe80::a8e0:d579:be00:72ab%2
IP6 Addr: fe80::a8e0:d579:be00:72ab%2
IP6 Addr: fe80::a8e0:d579:be00:72ab%2

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