struct iface_config *del_iface(struct iface_config *ifc)
{
struct iface_config *next;
int i;
next = ifc->next;
#if HAVE_LIBEVENT2
event_free(ifc->event);
#endif
pcap_freecode(&ifc->pcap_filter);
pcap_close(ifc->pcap_handle);
log_msg(LOG_DEBUG, "Closed interface %s", ifc->name);
if (ifc->cache) {
for (i = 0; i < cfg.hashsize; i++)
if (*(ifc->cache + i))
cache_prune(*(ifc->cache+i), ifc->cache+i);
free(ifc->cache);
}
free(ifc);
return next;
}
/* function to handle the re-populating of the avl tree containing IP addresses
* for deciding whether a connection of an incoming request is to be dropped.
*/
static void recheck_cached_file (cache_file_contents *cache, time_t now)
{
if (now >= cache->file_recheck)
{
struct stat file_stat;
FILE *file = NULL;
int count = 0;
char line [MAX_LINE_LEN];
cache->file_recheck = now + 10;
if (cache->filename == NULL)
{
cache_prune (cache);
return;
}
if (stat (cache->filename, &file_stat) < 0)
{
WARN2 ("failed to check status of \"%s\": %s", cache->filename, strerror(errno));
return;
}
if (file_stat.st_mtime == cache->file_mtime)
return; /* common case, no update to file */
cache->file_mtime = file_stat.st_mtime;
file = fopen (cache->filename, "r");
if (file == NULL)
{
WARN2("Failed to open file \"%s\": %s", cache->filename, strerror (errno));
return;
}
cache_prune (cache);
cache->contents = avl_tree_new (cache->compare, &cache->file_recheck);
while (get_line (file, line, MAX_LINE_LEN))
{
if(!line[0] || line[0] == '#')
continue;
count++;
cache->add_new_entry (cache, line, 0);
}
fclose (file);
INFO2 ("%d entries read from file \"%s\"", count, cache->filename);
}
}
struct mcache_node *cache_lookup(uint8_t *l2_addr, uint8_t *ip_addr,
uint8_t len, time_t tstamp, uint16_t vlan_tag, struct mcache_node **cache)
{
struct mcache_node *node;
for (node = *cache; node != NULL; node = node->next) {
/* New cache nodes are inserted at the begining of the list
* resulting cache list ordered by timestamp.
*
* If we find old cache node we can safely delete it and all
* following nodes.
*/
if (cfg.ratelimit > 0 && tstamp > node->tstamp + cfg.ratelimit) {
cache_prune(node, cache);
return NULL;
}
if (vlan_tag != node->vlan_tag)
continue;
if (len != node->addr_len)
continue;
if (memcmp(ip_addr, node->ip_addr, len))
continue;
if (memcmp(l2_addr, node->l2_addr, sizeof(node->l2_addr))) {
cache_del(node, cache);
return NULL;
}
return node;
}
return NULL;
}
