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[PATCH][BZ #14799] Allow to disable options in RES_OPTIONS
- From: OndÅej BÃlka <neleai at seznam dot cz>
- To: libc-alpha at sourceware dot org
- Date: Wed, 26 Nov 2014 01:17:13 +0100
- Subject: [PATCH][BZ #14799] Allow to disable options in RES_OPTIONS
- Authentication-results: sourceware.org; auth=none
Hi, this bug ticket ask to make posible to disable ip6 and other options
by RES_OPTIONS environment variable. Rather to add them manually I added
a check so no-option will do opposite of option.
OK to commit?
[BZ #14799]
* resolv/res_init.c (res_setoptions): Detect no- prefix to
disable option.
diff --git a/resolv/res_init.c b/resolv/res_init.c
index ea133f8..9ea43e9 100644
--- a/resolv/res_init.c
+++ b/resolv/res_init.c
@@ -533,26 +533,32 @@ res_setoptions(res_state statp, const char *options, const char *source) {
#define STRnLEN(str) str, sizeof (str) - 1
{ STRnLEN ("inet6"), 0, RES_USE_INET6 },
{ STRnLEN ("ip6-bytestring"), 0, RES_USEBSTRING },
- { STRnLEN ("no-ip6-dotint"), 0, RES_NOIP6DOTINT },
{ STRnLEN ("ip6-dotint"), 1, ~RES_NOIP6DOTINT },
{ STRnLEN ("rotate"), 0, RES_ROTATE },
- { STRnLEN ("no-check-names"), 0, RES_NOCHECKNAME },
+ { STRnLEN ("check-names"), 1, ~RES_NOCHECKNAME },
{ STRnLEN ("edns0"), 0, RES_USE_EDNS0 },
{ STRnLEN ("single-request-reopen"), 0, RES_SNGLKUPREOP },
{ STRnLEN ("single-request"), 0, RES_SNGLKUP },
{ STRnLEN ("no_tld_query"), 0, RES_NOTLDQUERY },
- { STRnLEN ("no-tld-query"), 0, RES_NOTLDQUERY },
+ { STRnLEN ("tld-query"), 1, ~RES_NOTLDQUERY },
{ STRnLEN ("use-vc"), 0, RES_USEVC }
};
#define noptions (sizeof (options) / sizeof (options[0]))
int i;
+ int invert = 0;
+ if (strncmp (cp, "no-", 3))
+ {
+ cp += 3;
+ invert = 1;
+ }
+
for (i = 0; i < noptions; ++i)
if (strncmp (cp, options[i].str, options[i].len) == 0)
{
- if (options[i].clear)
- statp->options &= options[i].flag;
+ if (options[i].clear ^ invert)
+ statp->options &= options[i].flag ^ invert;
else
- statp->options |= options[i].flag;
+ statp->options |= options[i].flag ^ invert;
break;
}
if (i == noptions) {