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resolv: Introduce struct resolv_context [BZ #21668]

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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.
This commit is contained in:
Florian Weimer
2017-06-30 21:10:23 +02:00
parent 4e45d83c92
commit 352f4ff9a2
24 changed files with 1032 additions and 370 deletions
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23
include/resolv.h
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@ -24,7 +24,6 @@ extern __thread struct __res_state *__resp attribute_tls_model_ie;
/* Now define the internal interfaces. */
extern int __res_vinit (res_state, int) attribute_hidden;
extern int __res_maybe_init (res_state, int);
extern void _sethtent (int);
extern struct hostent *_gethtent (void);
extern struct hostent *_gethtbyname (const char *__name);
@ -36,24 +35,11 @@ extern int res_ourserver_p (const res_state __statp,
const struct sockaddr_in6 *__inp);
extern void __res_iclose (res_state statp, bool free_addr);
libc_hidden_proto (__res_ninit)
libc_hidden_proto (__res_maybe_init)
libc_hidden_proto (__res_nclose)
libc_hidden_proto (__res_iclose)
libc_hidden_proto (__res_randomid)
libc_hidden_proto (__res_state)
int __libc_res_nquery (res_state, const char *, int, int,
unsigned char *, int, unsigned char **,
unsigned char **, int *, int *, int *);
int __libc_res_nsearch (res_state, const char *, int, int,
unsigned char *, int, unsigned char **,
unsigned char **, int *, int *, int *);
int __libc_res_nsend (res_state, const unsigned char *, int,
const unsigned char *, int, unsigned char *,
int, unsigned char **, unsigned char **,
int *, int *, int *)
attribute_hidden;
libresolv_hidden_proto (_sethtent)
libresolv_hidden_proto (_gethtent)
libresolv_hidden_proto (_gethtbyaddr)
@ -75,17 +61,8 @@ libresolv_hidden_proto (__p_type)
libresolv_hidden_proto (__loc_ntoa)
libresolv_hidden_proto (__fp_nquery)
libresolv_hidden_proto (__fp_query)
libresolv_hidden_proto (__hostalias)
libresolv_hidden_proto (__res_nmkquery)
libresolv_hidden_proto (__libc_res_nquery)
libresolv_hidden_proto (__res_nquery)
libresolv_hidden_proto (__res_nquerydomain)
libresolv_hidden_proto (__res_hostalias)
libresolv_hidden_proto (__libc_res_nsearch)
libresolv_hidden_proto (__res_nsearch)
libresolv_hidden_proto (__res_nameinquery)
libresolv_hidden_proto (__res_queriesmatch)
libresolv_hidden_proto (__res_nsend)
libresolv_hidden_proto (__b64_ntop)
libresolv_hidden_proto (__dn_count_labels)
libresolv_hidden_proto (__p_secstodate)