rehash: don't restart authd for DNS reloads

This could lead to pretty nasty things, like losing DNS (and in the
future, ident) queries. That's a Bad Thing™.

authd/authd.c

@@ -23,10 +23,12 @@
 
 #define MAXPARA 10
 
+static void handle_reload(int parc, char *parv[]);
 static void handle_stat(int parc, char *parv[]);
 
 rb_helper *authd_helper = NULL;
 authd_cmd_handler authd_cmd_handlers[255] = {
+	['C'] = handle_reload,
 	['D'] = resolve_dns,
 	['S'] = handle_stat,
 };
@@ -35,6 +37,10 @@ authd_stat_handler authd_stat_handlers[255] = {
 	['D'] = enumerate_nameservers,
 };
 
+authd_reload_handler authd_reload_handlers[255] = {
+	['D'] = reload_nameservers,
+};
+
 static void
 handle_stat(int parc, char *parv[])
 {
@@ -50,6 +56,21 @@ handle_stat(int parc, char *parv[])
 	handler(parv[1], parv[2][0]);
 }
 
+static void
+handle_reload(int parc, char *parv[])
+{
+	authd_reload_handler handler;
+
+	if(parc < 2)
+		 /* XXX Should log this somehow */
+		return;
+
+	if (!(handler = authd_reload_handlers[parv[1][0]]))
+		return;
+
+	handler(parv[1][0]);
+}
+
 static void
 parse_request(rb_helper *helper)
 {

authd/authd.h

@@ -31,7 +31,10 @@ extern rb_helper *authd_helper;
 
 typedef void (*authd_cmd_handler)(int parc, char *parv[]);
 typedef void (*authd_stat_handler)(const char *rid, const char letter);
+typedef void (*authd_reload_handler)(const char letter);
+
 extern authd_cmd_handler authd_cmd_handlers[255];
 extern authd_stat_handler authd_stat_handlers[255];
+extern authd_reload_handler authd_reload_handlers[255];
 
 #endif

authd/dns.c

@@ -174,3 +174,10 @@ enumerate_nameservers(const char *rid, const char letter)
 
 	rb_helper_write(authd_helper, "Y %s %c %s", rid, letter, buf);
 }
+
+void
+reload_nameservers(const char letter)
+{
+	/* Not a whole lot to it */
+	restart_resolver();
+}

authd/dns.h

@@ -36,5 +36,6 @@ struct dns_request
 
 extern void resolve_dns(int parc, char *parv[]);
 extern void enumerate_nameservers(const char *rid, const char letter);
+extern void reload_nameservers(const char letter);
 
 #endif

include/dns.h

@@ -40,5 +40,6 @@ void cancel_lookup(uint16_t xid);
 void dns_results_callback(const char *callid, const char *status, const char *aftype, const char *results);
 void dns_stats_results_callback(const char *callid, const char *status, int resc, const char *resv[]);
 void init_nameserver_cache(void);
+bool reload_nameservers(void);
 
 #endif

ircd/dns.c

@@ -322,6 +322,20 @@ init_nameserver_cache(void)
 	(void)get_nameservers(get_nameservers_cb, NULL);
 }
 
+bool
+reload_nameservers(void)
+{
+	if(authd_helper == NULL)
+	{
+		/* Shit */
+		return false;
+	}
+	rb_helper_write(authd_helper, "C D");
+	init_nameserver_cache();
+	return true;
+}
+
+
 static void
 submit_dns(uint16_t nid, char type, const char *addr)
 {

modules/m_rehash.c

@@ -84,8 +84,7 @@ rehash_dns(struct Client *source_p)
 	if (!MyConnect(source_p))
 		remote_rehash_oper_p = source_p;
 
-	/* reread /etc/resolv.conf and reopen res socket */
-	restart_authd();
+	reload_nameservers();
 }
 
 static void