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Removed the insert_data() function and made the LOCKing go around the

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entire dnscache() function. Replaced the "replace" code in dns_insert()
with a call to ternary_replace().
This commit is contained in:
Robert James Kaes 2001-08-30 16:50:42 +00:00
parent f68f30c7aa
commit c83c92a0d1
1 changed files with 14 additions and 56 deletions
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70
src/dnscache.c
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@ -1,4 +1,4 @@
/* $Id: dnscache.c,v 1.10 2001-08-29 03:57:51 rjkaes Exp $
/* $Id: dnscache.c,v 1.11 2001-08-30 16:50:42 rjkaes Exp $
*
* This is a caching DNS system. When a host name is needed we look it up here
* and see if there is already an answer for it. The domains are placed in a
@ -51,20 +51,6 @@ struct dnscache_s {
static TERNARY dns_tree = -1;
/*
* Insert the data into the DNS tree.
*/
static int insert_data(char *domain, struct dnscache_s *newptr)
{
int ret;
LOCK();
ret = ternary_insert(dns_tree, domain, newptr);
UNLOCK();
return ret;
}
static int dns_lookup(struct in_addr *addr, char *domain)
{
int ret;
@ -73,17 +59,14 @@ static int dns_lookup(struct in_addr *addr, char *domain)
assert(addr != NULL);
assert(domain != NULL);
LOCK();
ret = ternary_search(dns_tree, domain, (void *)&ptr);
if (TE_ISERROR(ret)
|| difftime(time(NULL), ptr->expire) > DNSEXPIRE) {
UNLOCK();
return -1;
}
memcpy(addr, &ptr->ipaddr, sizeof(struct in_addr));
UNLOCK();
return 0;
}
@ -91,7 +74,6 @@ static int dns_lookup(struct in_addr *addr, char *domain)
static int dns_insert(struct in_addr *addr, char *domain)
{
struct dnscache_s *newptr;
int ret;
assert(addr != NULL);
assert(domain != NULL);
@ -105,37 +87,9 @@ static int dns_insert(struct in_addr *addr, char *domain)
memcpy(&newptr->ipaddr, addr, sizeof(struct in_addr));
newptr->expire = time(NULL);
ret = insert_data(domain, newptr);
if (TE_ISERROR(ret)) {
if (ret == TE_EXISTS) {
/*
* The value already exists. First search for the
* value and then delete the data before inserting
* the new value.
*/
struct dnscache_s *existing;
DEBUG2("[%s] already exists in DNS cache", domain);
LOCK();
ret = ternary_search(dns_tree, domain, (void *)&existing);
UNLOCK();
if (TE_ISERROR(ret))
goto INSERT_ERROR;
safefree(existing);
ret = insert_data(domain, newptr);
if (TE_ISERROR(ret))
goto INSERT_ERROR;
} else {
INSERT_ERROR:
safefree(newptr);
return -1;
}
if (TE_ISERROR(ternary_replace(dns_tree, domain, newptr))) {
safefree(newptr);
return -1;
}
return 0;
@ -148,30 +102,34 @@ int dnscache(struct in_addr *addr, char *domain)
assert(addr != NULL);
assert(domain != NULL);
/* If the DNS tree doesn't exist, build a new one */
LOCK();
/* If the DNS tree doesn't exist, build a new one */
if (dns_tree < 0)
dns_tree = ternary_new();
UNLOCK();
if (inet_aton(domain, (struct in_addr *)addr) != 0)
if (inet_aton(domain, (struct in_addr *)addr) != 0) {
UNLOCK();
return 0;
}
/* Well, we're not dotted-decimal so we need to look it up */
if (dns_lookup(addr, domain) == 0)
if (dns_lookup(addr, domain) == 0) {
UNLOCK();
return 0;
}
/* Okay, so not in the list... need to actually look it up. */
LOCK();
if (!(resolv = gethostbyname(domain))) {
UNLOCK();
return -1;
}
memcpy(addr, resolv->h_addr_list[0], (size_t)resolv->h_length);
UNLOCK();
dns_insert(addr, domain);
UNLOCK();
return 0;
}