* Added a way to flush the dns cache

svn: 1422

misc/help.txt

@@ -416,13 +416,13 @@ See also: link
         3           Remove user
       
       $bbad-cookie$b             Missing or invalid cookie in bot op line.
-
+ 
       $bcookie-time-slack$b      How many seconds off of botnet timesync is allowed
                                  in cookies.
       $bmanop$b                  Users who op manually in a -manop chan.
       $bmdop$b                   Users who mass deop.
       $bmop$b                    Users who mass op in a -mop chan.
-
+ 
      The following can be set + or - (e.g. .chanset #channel -enforcebans)
         $bautoop$b         Bots that are +y will auto-op all users with 
                        op access to the channel.
@@ -705,7 +705,7 @@ See also: echo, page, strip
     Deleted bots that are running will be killed.
   
     'change' syntax is the same as 'add'
-
+ 
     'list' shows all the bots currently in the config.
  
     'set' allows changing some variables in the config.
@@ -881,6 +881,10 @@ See also: op, console
    This kills the bot. The bot goes offline immediately, logging who issued
    the 'die' command. You shouldn't have to use this too often. If you specify
    a reason, it is logged, otherwise the reason is "authorized by <handle>".
+::dns
+###  $bdns$b <hostname/ip/flush>
+   Resolves the given hostname/ip
+   If "flush" is the specified hostname, the cache will be flushed.
 ::down:
 ###  $bdown$b <channel>
    All linked bots will deop themselves in the specified channel. They

src/adns.c

@@ -539,6 +539,15 @@ static int cache_find(const char *query)
 	return (-1);
 }
 
+void dns_cache_flush()
+{
+  for (int i = 0; i < ncache; i++) {
+    cache_del(i);
+    if (i == ncache) break;
+    i--;
+  }
+}
+
 static int read_thing(char *buf, char *ip)
 {
 	int skip, len;

src/adns.h

@@ -17,7 +17,7 @@ int egg_dns_lookup(const char *host, int timeout, dns_callback_t callback, void
 int egg_dns_reverse(const char *ip, int timeout, dns_callback_t callback, void *client_data);
 int egg_dns_cancel(int id, int issue_callback);
 void tell_dnsdebug(int);
-
+void dns_cache_flush();
 
 extern int		dns_sock, dns_idx;
 extern const char	*dns_ip;

src/cmds.c

@@ -3934,6 +3934,11 @@ static void cmd_dns(int idx, char *par)
 {
   putlog(LOG_CMDS, "*", "#%s# dns %s", dcc[idx].nick, par);
 
+  if (!egg_strcasecmp(par, "flush")) {
+    dprintf(idx, "Flushing cache...\n");
+    dns_cache_flush();
+    return;
+  }
   dprintf(idx, "Looking up %s ...\n", par);
   egg_dns_lookup(par, 0, my_dns_callback, (void *) idx);
 }