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Fix a bug where fallback from AF_INET6 to AF_INET would not work properly together with relative search; if you had a search path of .a.com and .b.com, and foo.a.com would return ARES_ENODATA and foo.b.com would return ARES_ENOTFOUND, the lookup would not properly retry with AF_INET as it forgot the first ARES_ENODATA.

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This commit is contained in:
Steinar H. Gunderson 2007-10-16 21:27:51 +00:00
parent 65ba6e3337
commit 92aaff009d
1 changed files with 22 additions and 4 deletions
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26
ares/ares_search.c
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@ -42,6 +42,7 @@ struct search_query {
int next_domain; /* next search domain to try */
int trying_as_is; /* current query is for name as-is */
int timeouts; /* number of timeouts we saw for this request */
int ever_got_nodata; /* did we ever get ARES_ENODATA along the way? */
};
static void search_callback(void *arg, int status, int timeouts,
@ -58,7 +59,7 @@ void ares_search(ares_channel channel, const char *name, int dnsclass,
char *s;
const char *p;
int status, ndots;
/* If name only yields one domain to search, then we don't have
* to keep extra state, so just do an ares_query().
*/
@ -98,6 +99,7 @@ void ares_search(ares_channel channel, const char *name, int dnsclass,
squery->callback = callback;
squery->arg = arg;
squery->timeouts = 0;
squery->ever_got_nodata = 0;
/* Count the number of dots in name. */
ndots = 0;
@ -145,7 +147,7 @@ static void search_callback(void *arg, int status, int timeouts,
struct search_query *squery = (struct search_query *) arg;
ares_channel channel = squery->channel;
char *s;
squery->timeouts += timeouts;
/* Stop searching unless we got a non-fatal error. */
@ -157,6 +159,17 @@ static void search_callback(void *arg, int status, int timeouts,
/* Save the status if we were trying as-is. */
if (squery->trying_as_is)
squery->status_as_is = status;
/*
* If we ever get ARES_ENODATA along the way, record that; if the search
* should run to the very end and we got at least one ARES_ENODATA,
* then callers like ares_gethostbyname() may want to try a T_A search
* even if the last domain we queried for T_AAAA resource records
* returned ARES_ENOTFOUND.
*/
if (status == ARES_ENODATA)
squery->ever_got_nodata = 1;
if (squery->next_domain < channel->ndomains)
{
/* Try the next domain. */
@ -180,8 +193,13 @@ static void search_callback(void *arg, int status, int timeouts,
ares_query(channel, squery->name, squery->dnsclass, squery->type,
search_callback, squery);
}
else
end_squery(squery, squery->status_as_is, NULL, 0);
else {
if (squery->status_as_is == ARES_ENOTFOUND && squery->ever_got_nodata) {
end_squery(squery, ARES_ENODATA, NULL, 0);
}
else
end_squery(squery, squery->status_as_is, NULL, 0);
}
}
}