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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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36
resolv/resolv-internal.h
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@ -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