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Add support for DNS cache timeouts via the CURLOPT_DNS_CACHE_TIMEOUT option.

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The default cache timeout for this is 60 seconds, which is arbitrary and
completely subject to change :)
This commit is contained in:
Sterling Hughes 2002-01-08 04:26:47 +00:00
parent 87037136ef
commit 22ac08e06d
4 changed files with 63 additions and 14 deletions
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63
lib/hostip.c
View file

@ -93,24 +93,59 @@ void Curl_global_host_cache_dtor(void)
}
}
struct curl_dns_cache_entry {
Curl_addrinfo *addr;
int timestamp;
};
Curl_addrinfo *Curl_resolv(struct SessionHandle *data,
char *hostname,
int port,
char **bufp)
{
Curl_addrinfo *addr = NULL;
size_t hostname_len = strlen(hostname)+1;
struct curl_dns_cache_entry *p = NULL;
size_t hostname_len;
time_t now;
if (curl_hash_find(data->hostcache, hostname, hostname_len, (void **) &addr)) {
return addr;
/* If the host cache timeout is 0, we don't do DNS cach'ing
so fall through */
if (data->set.dns_cache_timeout == 0) {
return Curl_getaddrinfo(data, hostname, port, bufp);
}
addr = Curl_getaddrinfo(data, hostname, port, bufp);
if (!addr)
return NULL;
curl_hash_add(data->hostcache, hostname, hostname_len, (const void *) addr);
return addr;
hostname_len = strlen(hostname)+1;
time(&now);
/* See if its already in our dns cache */
if (curl_hash_find(data->hostcache, hostname, hostname_len, (void **) &p)) {
/* Do we need to check for a cache timeout? */
if (data->set.dns_cache_timeout != -1) {
/* Return if the entry has not timed out */
if ((now - p->timestamp) < data->set.dns_cache_timeout) {
return p->addr;
}
}
else {
return p->addr;
}
}
/* Create a new cache entry */
p = (struct curl_dns_cache_entry *) malloc(sizeof(struct curl_dns_cache_entry));
if (!p) {
return NULL;
}
p->addr = Curl_getaddrinfo(data, hostname, port, bufp);
if (!p->addr) {
return NULL;
}
p->timestamp = now;
/* Save it in our host cache */
curl_hash_update(data->hostcache, hostname, hostname_len, (const void *) p);
return p->addr;
}
/*
@ -120,11 +155,15 @@ Curl_addrinfo *Curl_resolv(struct SessionHandle *data,
*/
void Curl_freeaddrinfo(void *freethis)
{
struct curl_dns_cache_entry *p = (struct curl_dns_cache_entry *) freethis;
#ifdef ENABLE_IPV6
freeaddrinfo(freethis);
freeaddrinfo(p->addr);
#else
free(freethis);
free(p->addr);
#endif
free(p);
}
/* --- resolve name or IP-number --- */