Package: libc6
Version: 2.13-32
Severity: normal
When only the loopback interface is available, getaddrinfo incorrectly returns
EAI_NONAME when looking up localhost/127.0.0.1.
The following code snippet normally prints
0: Unknown error
0: Unknown error
when connected to the internet, but prints
-2: Name or service not known
-2: Name or service not known
when no non-loopback interface is available.
#include <netdb.h>
#include <string.h>
#include <stdio.h>
int main() {
char* ip = "127.0.0.1";
char* name = "localhost";
struct addrinfo aiHint;
memset(&aiHint, 0, sizeof(struct addrinfo));
aiHint.ai_socktype = SOCK_STREAM;
aiHint.ai_protocol = IPPROTO_TCP;
aiHint.ai_family = AF_INET;
aiHint.ai_flags = AI_ADDRCONFIG | AI_NUMERICHOST;
struct addrinfo *aiRes = NULL;
int nErr = getaddrinfo(ip, NULL, &aiHint, &aiRes);
printf("%d: %s\n", nErr, gai_strerror(nErr));
aiHint.ai_flags = AI_ADDRCONFIG;
nErr = getaddrinfo(name, NULL, &aiHint, &aiRes);
printf("%d: %s\n", nErr, gai_strerror(nErr));
return 0;
}
-- System Information:
Debian Release: wheezy/sid
APT prefers testing
APT policy: (700, 'testing'), (600, 'testing'), (500, 'testing'), (400,
'unstable'), (300, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 3.2.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages libc6 depends on:
ii libc-bin 2.13-32
ii libgcc1 1:4.6.3-1
libc6 recommends no packages.
Versions of packages libc6 suggests:
ii debconf [debconf-2.0] 1.5.41
ii glibc-doc <none>
ii locales 2.13-27
-- debconf information:
glibc/upgrade: true
glibc/restart-services:
libraries/restart-without-asking: false
glibc/disable-screensaver:
glibc/restart-failed:
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