bughz/tinyproxy
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Still need to fix a problem with tinproxy segfaulting when we try to

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delete the ternary tree.
This commit is contained in:
Robert James Kaes 2001-09-06 21:53:16 +00:00
parent 4670eb5194
commit 32ce57a6f6
1 changed files with 14 additions and 2 deletions
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16
src/dnscache.c
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@ -1,4 +1,4 @@
/* $Id: dnscache.c,v 1.11 2001-08-30 16:50:42 rjkaes Exp $ /* $Id: dnscache.c,v 1.12 2001-09-06 21:53:16 rjkaes Exp $
* *
* This is a caching DNS system. When a host name is needed we look it up here * 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 * and see if there is already an answer for it. The domains are placed in a
@ -43,6 +43,7 @@ static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
#define UNLOCK() pthread_mutex_unlock(&mutex); #define UNLOCK() pthread_mutex_unlock(&mutex);
#define DNSEXPIRE (5 * 60) #define DNSEXPIRE (5 * 60)
#define DNS_INSERT_LIMIT 5
struct dnscache_s { struct dnscache_s {
struct in_addr ipaddr; struct in_addr ipaddr;
@ -50,6 +51,7 @@ struct dnscache_s {
}; };
static TERNARY dns_tree = -1; static TERNARY dns_tree = -1;
static unsigned int dns_insertions;
static int dns_lookup(struct in_addr *addr, char *domain) static int dns_lookup(struct in_addr *addr, char *domain)
{ {
@ -105,8 +107,10 @@ int dnscache(struct in_addr *addr, char *domain)
LOCK(); LOCK();
/* If the DNS tree doesn't exist, build a new one */ /* If the DNS tree doesn't exist, build a new one */
if (dns_tree < 0) if (dns_tree < 0) {
dns_tree = ternary_new(); dns_tree = ternary_new();
dns_insertions = 0;
}
if (inet_aton(domain, (struct in_addr *)addr) != 0) { if (inet_aton(domain, (struct in_addr *)addr) != 0) {
UNLOCK(); UNLOCK();
@ -129,6 +133,14 @@ int dnscache(struct in_addr *addr, char *domain)
dns_insert(addr, domain); dns_insert(addr, domain);
dns_insertions++;
if (dns_insertions > DNS_INSERT_LIMIT) {
log_message(LOG_NOTICE, "DNS Insertion limit, rebuilding cache.");
ternary_destroy(dns_tree, NULL);
dns_tree = ternary_new();
dns_insertions = 0;
}
UNLOCK(); UNLOCK();
return 0; return 0;