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resolv: Support clearing option flags with a “-” prefix (bug 14799)

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I think using a “-” prefix is less confusing than introducing
double-negation construct (“no-no-tld-query”).

Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Florian Weimer
2024-07-24 12:06:47 +02:00
parent af625987d6
commit 95f61610f3
3 changed files with 30 additions and 14 deletions
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28
resolv/res_init.c
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@@ -682,27 +682,29 @@ res_setoptions (struct resolv_conf_parser *parser, const char *options)
{
char str[22];
uint8_t len;
uint8_t clear;
unsigned long int flag;
} options[] = {
#define STRnLEN(str) str, sizeof (str) - 1
{ STRnLEN ("rotate"), 0, RES_ROTATE },
{ 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 ("no-reload"), 0, RES_NORELOAD },
{ STRnLEN ("use-vc"), 0, RES_USEVC },
{ STRnLEN ("trust-ad"), 0, RES_TRUSTAD },
{ STRnLEN ("no-aaaa"), 0, RES_NOAAAA },
{ STRnLEN ("rotate"), RES_ROTATE },
{ STRnLEN ("edns0"), RES_USE_EDNS0 },
{ STRnLEN ("single-request-reopen"), RES_SNGLKUPREOP },
{ STRnLEN ("single-request"), RES_SNGLKUP },
{ STRnLEN ("no_tld_query"), RES_NOTLDQUERY },
{ STRnLEN ("no-tld-query"), RES_NOTLDQUERY },
{ STRnLEN ("no-reload"), RES_NORELOAD },
{ STRnLEN ("use-vc"), RES_USEVC },
{ STRnLEN ("trust-ad"), RES_TRUSTAD },
{ STRnLEN ("no-aaaa"), RES_NOAAAA },
};
#define noptions (sizeof (options) / sizeof (options[0]))
bool negate_option = *cp == '-';
if (negate_option)
++cp;
for (int i = 0; i < noptions; ++i)
if (strncmp (cp, options[i].str, options[i].len) == 0)
{
if (options[i].clear)
parser->template.options &= options[i].flag;
if (negate_option)
parser->template.options &= ~options[i].flag;
else
parser->template.options |= options[i].flag;
break;