Removed the custom hash routines. Using the ternary module instead.
This commit is contained in:
Robert James Kaes
parent
b7f7599d76
commit
df030a075f
145
src/dnscache.c
145
src/dnscache.c
@ -1,4 +1,4 @@
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/* $Id: dnscache.c,v 1.4 2000-04-26 16:31:29 rjkaes Exp $
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/* $Id: dnscache.c,v 1.5 2000-09-11 23:42:43 rjkaes Exp $
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*
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* This is a caching DNS system. When a host name is needed we look it up here
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* and see if there is already an answer for it. The domains are placed in a
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@ -21,129 +21,82 @@
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*/
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#ifdef HAVE_CONFIG_H
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#include <defines.h>
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# include <config.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <netdb.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <assert.h>
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#include <ctype.h>
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#include <unistd.h>
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#include "utils.h"
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#include "dnscache.h"
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#include "log.h"
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#include "ternary.h"
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#include "utils.h"
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#define HASH_BOX 25
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#define DNSEXPIRE (5 * 60)
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#define DNS_GARBAGE_COL 10
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struct dnscache_s {
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struct in_addr ipaddr;
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char *domain;
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time_t expire;
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struct dnscache_s *next;
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};
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struct dnscache_s *cache[HASH_BOX];
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static TERNARY dns_tree;
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static unsigned int hash(unsigned char *keystr, unsigned int box)
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static int dns_lookup(struct in_addr *addr, char *domain)
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{
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unsigned long hashc = 0;
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unsigned char ch;
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struct dnscache_s *ptr;
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assert(keystr);
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assert(box > 0);
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while ((ch = *keystr++))
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hashc += tolower(ch);
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return hashc % box;
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if (dns_tree == 0) {
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if (TE_ISERROR(dns_tree = ternary_new()))
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return dns_tree;
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}
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int lookup(struct in_addr *addr, char *domain)
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{
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unsigned int box = hash(domain, HASH_BOX);
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struct dnscache_s **rptr = &cache[box];
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struct dnscache_s *ptr = cache[box];
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if (TE_ISERROR(ternary_search(dns_tree, domain, (void *)&ptr)))
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return -1;
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assert(domain);
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while (ptr && strcasecmp(ptr->domain, domain)) {
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rptr = &ptr->next;
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ptr = ptr->next;
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}
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if (ptr && !strcasecmp(ptr->domain, domain)) {
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/* Woohoo... found it. Make sure it hasn't expired */
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if (difftime(time(NULL), ptr->expire) > DNSEXPIRE) {
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/* Oops... expired */
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*rptr = ptr->next;
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safefree(ptr->domain);
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safefree(ptr);
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return -1;
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}
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/* chris - added this so that the routine can be used to just
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* look stuff up.
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*/
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if (addr)
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*addr = ptr->ipaddr;
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return 0;
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}
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return -1;
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}
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int insert(struct in_addr *addr, char *domain)
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static int dns_insert(struct in_addr *addr, char *domain)
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{
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unsigned int box = hash(domain, HASH_BOX);
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struct dnscache_s **rptr = &cache[box];
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struct dnscache_s *ptr = cache[box];
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struct dnscache_s *newptr;
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assert(addr);
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assert(domain);
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while (ptr) {
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rptr = &ptr->next;
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ptr = ptr->next;
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}
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if (!(newptr = xmalloc(sizeof(struct dnscache_s)))) {
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return -1;
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}
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if (!(newptr->domain = xstrdup(domain))) {
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safefree(newptr);
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if (!(newptr = malloc(sizeof(struct dnscache_s)))) {
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return -1;
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}
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newptr->ipaddr = *addr;
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newptr->expire = time(NULL);
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*rptr = newptr;
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newptr->next = ptr;
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ternary_insert(dns_tree, domain, newptr);
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return 0;
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}
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int dnscache(struct in_addr *addr, char *domain)
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{
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static unsigned int dns_garbage_collect = 0;
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struct hostent *resolv;
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assert(addr);
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assert(domain);
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#if 0
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if (++dns_garbage_collect > DNS_GARBAGE_COL) {
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ternary_destroy(&dns_root, &free);
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DEBUG1("Doing garbage collection.");
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dns_garbage_collect = 0;
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}
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#endif
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if (inet_aton(domain, (struct in_addr *) addr) != 0)
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return 0;
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/* Well, we're not dotted-decimal so we need to look it up */
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if (lookup(addr, domain) == 0)
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if (dns_lookup(addr, domain) == 0)
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return 0;
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/* Okay, so not in the list... need to actually look it up. */
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@ -151,49 +104,7 @@ int dnscache(struct in_addr *addr, char *domain)
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return -1;
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memcpy(addr, resolv->h_addr_list[0], resolv->h_length);
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insert(addr, domain);
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dns_insert(addr, domain);
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return 0;
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}
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static void dnsdelete(unsigned int c, struct dnscache_s *del)
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{
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struct dnscache_s **rptr;
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struct dnscache_s *ptr;
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assert(c > 0);
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assert(del);
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rptr = &cache[c];
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ptr = cache[c];
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while (ptr && (ptr != del)) {
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rptr = &ptr->next;
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ptr = ptr->next;
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}
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if (ptr == del) {
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*rptr = ptr->next;
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safefree(ptr->domain);
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safefree(ptr);
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}
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}
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void dnsclean(void)
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{
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unsigned int c;
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struct dnscache_s *ptr, *tmp;
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for (c = 0; c < HASH_BOX; c++) {
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ptr = cache[c];
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while (ptr) {
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tmp = ptr->next;
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if (difftime(time(NULL), ptr->expire) > DNSEXPIRE)
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dnsdelete(c, ptr);
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ptr = tmp;
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}
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}
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}
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@ -1,4 +1,4 @@
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/* $Id: dnscache.h,v 1.1.1.1 2000-02-16 17:32:22 sdyoung Exp $
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/* $Id: dnscache.h,v 1.2 2000-09-11 23:42:43 rjkaes Exp $
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*
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* See 'dnscache.c' for a detailed description.
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*
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@ -15,24 +15,11 @@
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* General Public License for more details.
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*/
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#ifndef _DNSCACHE_H_
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#define _DNSCACHE_H_ 1
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#ifndef _TINYPROXY_DNSCACHE_H_
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#define _TINYPROXY_DNSCACHE_H_
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#ifdef HAVE_CONFIG_H
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#include <defines.h>
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#endif
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#define DNS_GARBAGE_COL 100
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extern int dnscache(struct in_addr *addr, char *domain);
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extern void dnsclean(void);
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/* chris - Access these from reqs.c because of ADNS. Ugly. */
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extern int lookup(struct in_addr *addr, char *domain);
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extern int insert(struct in_addr *addr, char *domain);
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#endif
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