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nss-util: be a tiny bit more compatible with glibc's lookup behaviour regarding IPv6

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Check for RES_USE_INET6 before we prefer IPv6 over IPv4, for all our NSS
modules. (Not that the DNS resolver that is configured with this matters
to us, but hey, let's try to be compatible).
This commit is contained in:
Lennart Poettering 2014-07-17 19:27:48 +02:00
parent a71516dfd1
commit ea30eb86e5
1 changed files with 16 additions and 2 deletions
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18
src/shared/nss-util.h
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@ -23,6 +23,7 @@
#include <nss.h>
#include <netdb.h>
#include <resolv.h>
#define NSS_GETHOSTBYNAME_PROTOTYPES(module) \
enum nss_status _nss_##module##_gethostbyname4_r( \
@ -87,14 +88,27 @@ enum nss_status _nss_##module##_gethostbyname_r( \
struct hostent *host, \
char *buffer, size_t buflen, \
int *errnop, int *h_errnop) { \
return _nss_##module##_gethostbyname3_r( \
enum nss_status ret = NSS_STATUS_NOTFOUND; \
\
if (_res.options & RES_USE_INET6) \
ret = _nss_##module##_gethostbyname3_r( \
name, \
AF_UNSPEC, \
AF_INET6, \
host, \
buffer, buflen, \
errnop, h_errnop, \
NULL, \
NULL); \
if (ret == NSS_STATUS_NOTFOUND) \
ret = _nss_##module##_gethostbyname3_r( \
name, \
AF_INET, \
host, \
buffer, buflen, \
errnop, h_errnop, \
NULL, \
NULL); \
return ret; \
}
#define NSS_GETHOSTBYADDR_FALLBACKS(module) \