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import of dnsmasq-2.42.tar.gz

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This commit is contained in:
Simon Kelley
2008-05-30 20:06:34 +01:00
parent 824af85bdf
commit 9e038946a1
28 changed files with 3231 additions and 2833 deletions
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34
src/cache.c
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@@ -359,6 +359,7 @@ struct crec *cache_insert(char *name, struct all_addr *addr,
struct crec *new;
union bigname *big_name = NULL;
int freed_all = flags & F_REVERSE;
int free_avail = 0;
log_query(flags | F_UPSTREAM, name, addr, 0, NULL, 0);
@@ -392,8 +393,24 @@ struct crec *cache_insert(char *name, struct all_addr *addr,
if (new->flags & (F_FORWARD | F_REVERSE))
{
/* If free_avail set, we believe that an entry has been freed.
Bugs have been known to make this not true, resulting in
a tight loop here. If that happens, log a warning and abandon the
insert. Once in this state, all inserts will probably fail. */
if (free_avail)
{
static int warned = 0;
if (!warned)
my_syslog(LOG_ERR, "BUG in cache detected. Please mail simon@thekelleys.org.uk");
warned = insert_error = 1;
return NULL;
}
if (freed_all)
{
free_avail = 1; /* Must be free space now. */
cache_scan_free(cache_get_name(new), &new->addr.addr, now, new->flags);
cache_live_freed++;
}
@@ -516,19 +533,22 @@ struct crec *cache_find_by_name(struct crec *crecp, char *name, time_t now, unsi
Make sure that re-ordering doesn't break the hash-chain
order invariants.
*/
if (!insert)
{
insert = up;
ins_flags = crecp->flags & (F_REVERSE | F_IMMORTAL);
up = &crecp->hash_next;
}
else if ((crecp->flags & (F_REVERSE | F_IMMORTAL)) == ins_flags)
if (insert && (crecp->flags & (F_REVERSE | F_IMMORTAL)) == ins_flags)
{
*up = crecp->hash_next;
crecp->hash_next = *insert;
*insert = crecp;
insert = &crecp->hash_next;
}
else
{
if (!insert)
{
insert = up;
ins_flags = crecp->flags & (F_REVERSE | F_IMMORTAL);
}
up = &crecp->hash_next;
}
}
else
/* case : not expired, incorrect entry. */