Package: libc6-dev
Version: 2.33-7
Severity: normal
Dear Maintainer,
Under certain circumstances, when calling getaddrinfo with hints.ai_family =
AF_UNSPEC, the first result is an AF_INET address. When calling it with
hints.ai_family = AF_INET, however, it returns 251 (No address associated with
hostname).
Here is a short program that reproduces the issue:
```c
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netdb.h>
int main(int argc, char *argv[]) {
const char hostname[] = "SomeHostname";
const char service[] = "1433";
struct addrinfo hints, *res;
memset(&hints, 0, sizeof(hints));
int ret = getaddrinfo(hostname, service, &hints, &res);
assert(ret == 0);
assert(res->ai_family == AF_INET);
freeaddrinfo(res);
hints.ai_family = AF_INET;
ret = getaddrinfo(hostname, service, &hints, &res);
if (ret != 0) {
printf(gai_strerror(ret));
printf("\n");
} else {
freeaddrinfo(res);
}
return ret;
}
```
I have only been able to reproduce the bug when all of the following criteria
are met:
- Running in a Docker container on a Windows host
- The hostname is unqualified
- The container's /etc/resolv.conf does not include the correct search option
to resolve the hostname
- The Windows host is set up to resolve unqualified names by applying the
correct DNS suffix
getaddrinfo() also returns 251 if the AI_ADDRCONFIG flag is set, even though
the container has an IPV4 address.
The bug is also present in 2.34-0experimental3.
Symptoms are superficially similar to #854301, but the container is online and
passing AI_ADDRCONFIG returns no result.
-- System Information:
Debian Release: bookworm/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 5.10.60.1-microsoft-standard-WSL2 (SMP w/12 CPU threads)
Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: unable to detect
Versions of packages libc6-dev depends on:
ii libc-dev-bin 2.33-7
ii libc6 2.33-7
ii libcrypt-dev 1:4.4.27-1.1
ii libnsl-dev 1.3.0-2
ii linux-libc-dev 5.16.12-1
ii rpcsvc-proto 1.4.2-4
libc6-dev recommends no packages.
Versions of packages libc6-dev suggests:
pn glibc-doc <none>
ii manpages-dev 5.10-1
-- no debconf information
