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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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resolv/res_debug.c
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@ -613,6 +613,7 @@ p_option(u_long option) {
case RES_SNGLKUPREOP: return "single-request-reopen";
case RES_USE_DNSSEC: return "dnssec";
case RES_NOTLDQUERY: return "no-tld-query";
case RES_NORELOAD: return "no-reload";
/* XXX nonreentrant */
default: sprintf(nbuf, "?0x%lx?", (u_long)option);
return (nbuf);