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resolv: Automatically reload a changed /etc/resolv.conf file [BZ #984]

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This commit enhances the stub resolver to reload the configuration
in the per-thread _res object if the /etc/resolv.conf file has
changed.  The resolver checks whether the application has modified
_res and will not overwrite the _res object in that case.

The struct resolv_context mechanism is used to check the
configuration file only once per name lookup.
This commit is contained in:
Florian Weimer
2017-07-03 21:06:23 +02:00
parent a1c4eb8794
commit aef16cc8a4
11 changed files with 273 additions and 95 deletions
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17
resolv/resolv_conf.h
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@ -35,11 +35,6 @@ struct resolv_sortlist_entry
object. */
struct resolv_conf
{
/* Used to propagate the effect of res_init across threads. This
member is mutable and prevents sharing of the same struct
resolv_conf object among multiple struct __res_state objects. */
unsigned long long int initstamp;
/* Reference counter. The object is deallocated once it reaches
zero. For internal use within resolv_conf only. */
size_t __refcount;
@ -69,6 +64,18 @@ struct resolv_conf
struct __res_state;
/* Read /etc/resolv.conf and return a configuration object, or NULL if
/etc/resolv.conf cannot be read due to memory allocation errors.
If PREINIT is not NULL, some configuration values are taken from the
struct __res_state object. */
struct resolv_conf *__resolv_conf_load (struct __res_state *preinit)
attribute_hidden __attribute__ ((warn_unused_result));
/* Return a configuration object for the current /etc/resolv.conf
settings, or NULL on failure. The object is cached. */
struct resolv_conf *__resolv_conf_get_current (void)
attribute_hidden __attribute__ ((warn_unused_result));
/* Return the extended resolver state for *RESP, or NULL if it cannot
be determined. A call to this function must be paired with a call
to __resolv_conf_put. */