From 081afb84df011547579f3a10a24b2c51db9d6591 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Mon, 27 Jul 2015 02:52:54 +0200
Subject: make connected client type exclusive


diff --git a/src/switchctl.c b/src/switchctl.c
index a06912a..5366a00 100644
--- a/src/switchctl.c
+++ b/src/switchctl.c
@@ -530,22 +530,58 @@ int update_health_status(int fd, cmd_t **cmd_q, client_t* client_lst, options_t*
 
 void process_cmd_type(const char* param, int fd, cmd_t **cmd_q, client_t* client_lst, options_t* opt)
 {
+  bool mc, sc, hmc, hsc;
+  mc = sc = hmc = hsc = 0;
+
+  client_t* client;
+  for(client = client_lst; client; client = client->next) {
+    switch(client->type) {
+      case MASTER: mc=1; break;
+      case STANDBY: sc=1; break;
+      case HB_MASTER: hmc=1; break;
+      case HB_STANDBY: hsc=1; break;
+      default: break;
+    }
+  }
+
   if(param) {
     client_t* client = client_find(client_lst, fd);
     if(client) {
       if(client->type == DEFAULT) {
         if(!strncmp(param, "master", 6)) {
+          if(mc) {
+            log_printf(DEBUG, "client of type '%s' already connected", param);
+            send_response(fd, "EEE: type: already connected");
+            return;
+          }
           client->type = MASTER;
           client->gpi_listener = 1;
         }
         else if(!strncmp(param, "standby", 7)) {
+          if(sc) {
+            log_printf(DEBUG, "client of type '%s' already connected", param);
+            send_response(fd, "EEE: type: already connected");
+            return;
+          }
           client->type = STANDBY;
           client->gpi_listener = 1;
         }
-        else if(!strncmp(param, "hb_master", 9))
+        else if(!strncmp(param, "hb_master", 9)) {
+          if(hmc) {
+            log_printf(DEBUG, "client of type '%s' already connected", param);
+            send_response(fd, "EEE: type: already connected");
+            return;
+          }
           client->type = HB_MASTER;
-        else if(!strncmp(param, "hb_standby", 10))
+        }
+        else if(!strncmp(param, "hb_standby", 10)) {
+          if(hsc) {
+            log_printf(DEBUG, "client of type '%s' already connected", param);
+            send_response(fd, "EEE: type: already connected");
+            return;
+          }
           client->type = HB_STANDBY;
+        }
         else {
           log_printf(DEBUG, "unkown client type '%s'", param);
           send_response(fd, "EEE: type: unknown client type");
-- 
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