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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 /resolv/resolv-internal.h
parent4e45d83c92dbb5b8dc20654f32395108d18cf739 (diff)
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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 'resolv/resolv-internal.h')
-rw-r--r--resolv/resolv-internal.h36
1 files changed, 34 insertions, 2 deletions
diff --git a/resolv/resolv-internal.h b/resolv/resolv-internal.h
index 5a9faf8de9..9246497196 100644
--- a/resolv/resolv-internal.h
+++ b/resolv/resolv-internal.h
@@ -52,9 +52,41 @@ enum
RESOLV_EDNS_BUFFER_SIZE = 1200,
};
+struct resolv_context;
+
+/* Internal function for implementing res_nmkquery and res_mkquery.
+ Also used by __res_context_query. */
+int __res_context_mkquery (struct resolv_context *, int op, const char *dname,
+ int class, int type, const unsigned char *data,
+ unsigned char *buf, int buflen) attribute_hidden;
+
+/* Main resolver query function for use within glibc. */
+int __res_context_search (struct resolv_context *, const char *, int, int,
+ unsigned char *, int, unsigned char **,
+ unsigned char **, int *, int *, int *);
+libresolv_hidden_proto (__res_context_search)
+
+/* Main resolver query function for use within glibc. */
+int __res_context_query (struct resolv_context *, const char *, int, int,
+ unsigned char *, int, unsigned char **,
+ unsigned char **, int *, int *, int *);
+libresolv_hidden_proto (__res_context_query)
+
+/* Internal function used to implement the query and search
+ functions. */
+int __res_context_send (struct resolv_context *, const unsigned char *, int,
+ const unsigned char *, int, unsigned char *,
+ int, unsigned char **, unsigned char **,
+ int *, int *, int *) attribute_hidden;
+
+/* Internal function similar to res_hostalias. */
+const char *__res_context_hostalias (struct resolv_context *,
+ const char *, char *, size_t);
+libresolv_hidden_proto (__res_context_hostalias);
+
/* Add an OPT record to a DNS query. */
-int __res_nopt (res_state, int n0, unsigned char *buf, int buflen,
- int anslen) attribute_hidden;
+int __res_nopt (struct resolv_context *, int n0,
+ unsigned char *buf, int buflen, int anslen) attribute_hidden;
/* Convert from presentation format (which usually means ASCII
printable) to network format (which is usually some kind of binary