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authorFlorian Weimer <fweimer@redhat.com>2017-06-30 21:10:23 +0200
committerFlorian Weimer <fweimer@redhat.com>2017-07-03 20:52:59 +0200
commit352f4ff9a268b81ef5d4b2413f582565806e4790 (patch)
treefb27056dfdeafe43c021f6127c9544c016e78019 /nscd
parent4e45d83c92dbb5b8dc20654f32395108d18cf739 (diff)
downloadglibc-352f4ff9a268b81ef5d4b2413f582565806e4790.tar.gz
resolv: Introduce struct resolv_context [BZ #21668]
struct resolv_context objects provide a temporary resolver context which does not change during a name lookup operation. Only when the outmost context is created, the stub resolver configuration is verified to be current (at present, only against previous res_init calls). Subsequent attempts to obtain the context will reuse the result of the initial verification operation. struct resolv_context can also be extended in the future to store data which needs to be deallocated during thread cancellation.
Diffstat (limited to 'nscd')
-rw-r--r--nscd/aicache.c21
1 files changed, 11 insertions, 10 deletions
diff --git a/nscd/aicache.c b/nscd/aicache.c
index f1f9284f6d..a3de792cc4 100644
--- a/nscd/aicache.c
+++ b/nscd/aicache.c
@@ -26,6 +26,8 @@
#include <unistd.h>
#include <sys/mman.h>
#include <resolv/resolv-internal.h>
+#include <resolv/resolv_context.h>
+#include <resolv/res_use_inet6.h>
#include "dbg_log.h"
#include "nscd.h"
@@ -100,17 +102,15 @@ addhstaiX (struct database_dyn *db, int fd, request_header *req,
no_more = 0;
nip = hosts_database;
- /* Initialize configurations. */
- if (__res_maybe_init (&_res, 0) == -1)
+ /* Initialize configurations. If we are looking for both IPv4 and
+ IPv6 address we don't want the lookup functions to automatically
+ promote IPv4 addresses to IPv6 addresses. Therefore, use the
+ _no_inet6 variant. */
+ struct resolv_context *ctx = __resolv_context_get ();
+ bool enable_inet6 = __resolv_context_disable_inet6 (ctx);
+ if (ctx == NULL)
no_more = 1;
- /* If we are looking for both IPv4 and IPv6 address we don't want
- the lookup functions to automatically promote IPv4 addresses to
- IPv6 addresses. Currently this is decided by setting the
- RES_USE_INET6 bit in _res.options. */
- int old_res_options = _res.options;
- _res.options &= ~DEPRECATED_RES_USE_INET6;
-
size_t tmpbuf6len = 1024;
char *tmpbuf6 = alloca (tmpbuf6len);
size_t tmpbuf4len = 0;
@@ -534,7 +534,8 @@ next_nip:
}
out:
- _res.options |= old_res_options & DEPRECATED_RES_USE_INET6;
+ __resolv_context_enable_inet6 (ctx, enable_inet6);
+ __resolv_context_put (ctx);
if (dataset != NULL && !alloca_used)
{