dhcpv6: Prevent user from starting DHCPv6 multiple times

We must make sure that user cannot start DHCPv6 many times
for a given network.

diff --git a/src/dhcpv6.c b/src/dhcpv6.c
index 04b8b2b..e629066 100644 (file)
--- a/src/dhcpv6.c
+++ b/src/dhcpv6.c
@@ -67,6 +67,7 @@ struct connman_dhcpv6 {
        GSList *prefixes;       /* network prefixes from radvd */
        int request_count;      /* how many times REQUEST have been sent */
        gboolean stateless;     /* TRUE if stateless DHCPv6 is used */
+       gboolean started;       /* TRUE if we have DHCPv6 started */
 };
 
 static GHashTable *network_table;
@@ -106,6 +107,7 @@ static void dhcpv6_free(struct connman_dhcpv6 *dhcp)
 
        dhcp->nameservers = NULL;
        dhcp->timeservers = NULL;
+       dhcp->started = FALSE;
 
        g_slist_foreach(dhcp->prefixes, free_prefix, NULL);
        g_slist_free(dhcp->prefixes);
@@ -985,6 +987,12 @@ int __connman_dhcpv6_start_info(struct connman_network *network,
 
        DBG("");
 
+       if (network_table != NULL) {
+               dhcp = g_hash_table_lookup(network_table, network);
+               if (dhcp != NULL && dhcp->started == TRUE)
+                       return -EBUSY;
+       }
+
        dhcp = g_try_new0(struct connman_dhcpv6, 1);
        if (dhcp == NULL)
                return -ENOMEM;
@@ -992,6 +1000,7 @@ int __connman_dhcpv6_start_info(struct connman_network *network,
        dhcp->network = network;
        dhcp->callback = callback;
        dhcp->stateless = TRUE;
+       dhcp->started = TRUE;
 
        connman_network_ref(network);
 
@@ -1144,6 +1153,12 @@ int __connman_dhcpv6_start(struct connman_network *network,
 
        DBG("");
 
+       if (network_table != NULL) {
+               dhcp = g_hash_table_lookup(network_table, network);
+               if (dhcp != NULL && dhcp->started == TRUE)
+                       return -EBUSY;
+       }
+
        dhcp = g_try_new0(struct connman_dhcpv6, 1);
        if (dhcp == NULL)
                return -ENOMEM;
@@ -1151,6 +1166,7 @@ int __connman_dhcpv6_start(struct connman_network *network,
        dhcp->network = network;
        dhcp->callback = callback;
        dhcp->prefixes = prefixes;
+       dhcp->started = TRUE;
 
        connman_network_ref(network);