Comparing address/port number

If you want to be pedant...
getnameinfo(), then compare string

If you just want to support IPv4/v6
switch-case and typecast
But we can't support address families we don't know about

if (sa1->sa_len != sa2->sa_len)
        return 0;
if (getnameinfo(sa1, sa1->sa_len, h1, sizeof(h1),
    NULL, 0, NI_NUMERICHOST), 0) != 0)
        return 0;
if (getnameinfo(sa2, sa2->sa_len, h2, sizeof(h2),
    NULL, 0, NI_NUMERICHOST), 0) != 0)
        return 0;
if (strcmp(h1, h2) == 0)
        return 1;
else
        return 0;