Erwan Le Pape <lepaperw...@gmail.com> added the comment:
Assuming similar configuration to the one in msg343430, a simple native
getaddrinfo test to check whether any scope ID is returned.
```
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
void test(char *addrstr) {
int status;
struct addrinfo *res;
struct addrinfo *iter;
struct sockaddr_in6 *addr;
status = getaddrinfo(addrstr, "80", NULL, &res);
if (status != 0) {
fprintf(stderr, "getaddrinfo(%s) returned %i\n", addrstr, status);
return;
}
for (iter = res; iter; iter = iter->ai_next) {
if (iter->ai_addr->sa_family != AF_INET6)
continue;
addr = (struct sockaddr_in6 *) iter->ai_addr;
if (addr->sin6_scope_id != 0) {
fprintf(stdout, "getaddrinfo(%s) return scope %u\n", addrstr,
addr->sin6_scope_id);
return;
}
}
}
int main() {
test("fe80::f8d1:81ff:fe81:ac05%2");
test("fe80::f8d1:81ff:fe81:ac05%en1");
return 0;
}
```
I've explicitly tested against numeric and named interfaces to ensure that this
isn't linked to AIX only handling named interfaces for scopes instead of
numeric ones (although given your `netstat` output, that's be surprising).
Since I've had to look for AIX programming documentation just to be sure, I
also stumbled upon this AIX bug
https://www-01.ibm.com/support/docview.wss?uid=isg1IV53671 (which is referenced
by the one I mentioned previously but I missed that). It seem to apply up to
7100-03 so you should be immune nonetheless.
I also noticed that it mentions SSH not working so I went and checked the
OpenSSH sources to see how they handle AIX.
While they have an explicit BROKEN_GETADDRINFO define, it doesn't check for the
specific scoped IPv6 address issue so I'm not sure they decided to special case
it.
https://github.com/openssh/openssh-portable/blob/85ceb0e64bff672558fc87958cd548f135c83cdd/configure.ac#L2341
If this is truly an "idiosyncrasy" in AIX, I'm not sure there is a better way
to handle it than skipping it since it's not really a Python bug if the
underlying `libc` doesn't work as intended.
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<https://bugs.python.org/issue35545>
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