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[l2tpns.git] / l2tpns.c
diff --git a/l2tpns.c b/l2tpns.c
index 87ff163..de3929d 100644 (file)
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -4,7 +4,7 @@
 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
 // vim: sw=8 ts=8
 
 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
 // vim: sw=8 ts=8
 
-char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.49 2004/11/16 07:54:32 bodea Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.56 2004/11/25 02:49:18 bodea Exp $";
 
 #include <arpa/inet.h>
 #include <assert.h>
 
 #include <arpa/inet.h>
 #include <assert.h>
@@ -167,10 +167,10 @@ static void build_chap_response(char *challenge, u8 id, u16 challenge_length, ch
 static void update_config(void);
 static void read_config_file(void);
 static void initplugins(void);
 static void update_config(void);
 static void read_config_file(void);
 static void initplugins(void);
-static void add_plugin(char *plugin_name);
-static void remove_plugin(char *plugin_name);
+static int add_plugin(char *plugin_name);
+static int remove_plugin(char *plugin_name);
 static void plugins_done(void);
 static void plugins_done(void);
-static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr);
+static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr, int alen);
 static tunnelidt new_tunnel(void);
 static int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length);
 
 static tunnelidt new_tunnel(void);
 static int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length);
 
@@ -434,8 +434,8 @@ static void initudp(void)
        // Control
        memset(&addr, 0, sizeof(addr));
        addr.sin_family = AF_INET;
        // Control
        memset(&addr, 0, sizeof(addr));
        addr.sin_family = AF_INET;
-       addr.sin_port = htons(1702);
-       controlfd = socket(AF_INET, SOCK_DGRAM, 17);
+       addr.sin_port = htons(NSCTL_PORT);
+       controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
        setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
        if (bind(controlfd, (void *) &addr, sizeof(addr)) < 0)
        {
        setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
        if (bind(controlfd, (void *) &addr, sizeof(addr)) < 0)
        {
@@ -657,6 +657,7 @@ void tunnelsend(u8 * buf, u16 l, tunnelidt t)
                STAT(tunnel_tx_errors);
                return;
        }
                STAT(tunnel_tx_errors);
                return;
        }
+
        memset(&addr, 0, sizeof(addr));
        addr.sin_family = AF_INET;
        *(u32 *) & addr.sin_addr = htonl(tunnel[t].ip);
        memset(&addr, 0, sizeof(addr));
        addr.sin_family = AF_INET;
        *(u32 *) & addr.sin_addr = htonl(tunnel[t].ip);
@@ -783,11 +784,7 @@ static void processipout(u8 * buf, int len)
        // Add on L2TP header
        {
                u8 *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
        // Add on L2TP header
        {
                u8 *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
-               if (!p)
-               {
-                       LOG(3, session[s].ip, s, t, "failed to send packet in processipout.\n");
-                       return;
-               }
+               if (!p) return;
                tunnelsend(b, len + (p-b), t); // send it...
        }
 
                tunnelsend(b, len + (p-b), t); // send it...
        }
 
@@ -837,11 +834,7 @@ static void send_ipout(sessionidt s, u8 *buf, int len)
        // Add on L2TP header
        {
                u8 *p = makeppp(b, sizeof(b),  buf, len, t, s, PPPIP);
        // Add on L2TP header
        {
                u8 *p = makeppp(b, sizeof(b),  buf, len, t, s, PPPIP);
-               if (!p)
-               {
-                       LOG(3, session[s].ip, s, t, "failed to send packet in send_ipout.\n");
-                       return;
-               }
+               if (!p) return;
                tunnelsend(b, len + (p-b), t); // send it...
        }
 
                tunnelsend(b, len + (p-b), t); // send it...
        }
 
@@ -1052,15 +1045,20 @@ void sessionshutdown(sessionidt s, char *reason)
        if (session[s].ip)
        {                          // IP allocated, clear and unroute
                int r;
        if (session[s].ip)
        {                          // IP allocated, clear and unroute
                int r;
+               int routed = 0;
                for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
                {
                for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
                {
+                       if ((session[s].ip & session[s].route[r].mask) ==
+                           (session[s].route[r].ip & session[s].route[r].mask))
+                               routed++;
+
                        routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 0);
                        session[s].route[r].ip = 0;
                }
 
                if (session[s].ip_pool_index == -1) // static ip
                {
                        routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 0);
                        session[s].route[r].ip = 0;
                }
 
                if (session[s].ip_pool_index == -1) // static ip
                {
-                       routeset(s, session[s].ip, 0, 0, 0);    // Delete route.
+                       if (!routed) routeset(s, session[s].ip, 0, 0, 0);
                        session[s].ip = 0;
                }
                else
                        session[s].ip = 0;
                }
                else
@@ -1109,11 +1107,7 @@ void sendipcp(tunnelidt t, sessionidt s)
        }
 
        q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP);
        }
 
        q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP);
-       if (!q)
-       {
-               LOG(3, session[s].ip, s, t, "failed to send packet in sendipcp.\n");
-               return;
-       }
+       if (!q) return;
 
        *q = ConfigReq;
        q[1] = r << RADIUS_SHIFT;                    // ID, dont care, we only send one type of request
 
        *q = ConfigReq;
        q[1] = r << RADIUS_SHIFT;                    // ID, dont care, we only send one type of request
@@ -2067,11 +2061,7 @@ static int regular_cleanups(void)
                        u8 b[MAXCONTROL] = {0};
 
                        u8 *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP);
                        u8 b[MAXCONTROL] = {0};
 
                        u8 *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP);
-                       if (!q)
-                       {
-                               LOG(3, session[s].ip, s, t, "failed to send ECHO packet.\n");
-                               continue;
-                       }
+                       if (!q) continue;
 
                        *q = EchoReq;
                        *(u8 *)(q + 1) = (time_now % 255); // ID
 
                        *q = EchoReq;
                        *(u8 *)(q + 1) = (time_now % 255); // ID
@@ -2324,7 +2314,7 @@ static void mainloop(void)
                        }
 
                        if (FD_ISSET(controlfd, &r))
                        }
 
                        if (FD_ISSET(controlfd, &r))
-                               processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr);
+                               processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
 
                        if (FD_ISSET(clifd, &r))
                        {
 
                        if (FD_ISSET(clifd, &r))
                        {
@@ -2934,32 +2924,31 @@ int main(int argc, char *argv[])
        {
                switch (i)
                {
        {
                switch (i)
                {
-                       case 'd':
-                               if (fork()) exit(0);
-                               setsid();
-                               freopen("/dev/null", "r", stdin);
-                               freopen("/dev/null", "w", stdout);
-                               freopen("/dev/null", "w", stderr);
-                               break;
-                       case 'v':
-                               optdebug++;
-                               break;
-                       case 'c':
-                               optconfig = optarg;
-                               break;
-                       case 'h':
-                               snprintf(hostname, sizeof(hostname), "%s", optarg);
-                               break;
-                       default:
-                               printf("Args are:\n"
-                                      "\t-d\tDetach from terminal\n"
-                                      "\t-c <file>\tConfig file\n"
-                                      "\t-h <hostname>\tForce hostname\n"
-                                      "\t-a <address>\tUse specific address\n"
-                                      "\t-v\t\tDebug\n");
-
-                               return (0);
-                               break;
+               case 'd':
+                       if (fork()) exit(0);
+                       setsid();
+                       freopen("/dev/null", "r", stdin);
+                       freopen("/dev/null", "w", stdout);
+                       freopen("/dev/null", "w", stderr);
+                       break;
+               case 'v':
+                       optdebug++;
+                       break;
+               case 'c':
+                       optconfig = optarg;
+                       break;
+               case 'h':
+                       snprintf(hostname, sizeof(hostname), "%s", optarg);
+                       break;
+               default:
+                       printf("Args are:\n"
+                              "\t-d\t\tDetach from terminal\n"
+                              "\t-c <file>\tConfig file\n"
+                              "\t-h <hostname>\tForce hostname\n"
+                              "\t-v\t\tDebug\n");
+
+                       return (0);
+                       break;
                }
        }
 
                }
        }
 
@@ -3577,18 +3566,30 @@ int sessionsetup(tunnelidt t, sessionidt s)
                }
        }
 
                }
        }
 
+       {
+               int routed = 0;
+
                // Add the route for this session.
                // Add the route for this session.
-               //
-               // Static IPs need to be routed. Anything else
-               // is part of the IP address pool and is already routed,
-               // it just needs to be added to the IP cache.
-       if (session[s].ip_pool_index == -1) // static ip
-               routeset(s, session[s].ip, 0, 0, 1);
-       else
-               cache_ipmap(session[s].ip, s);
+               for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
+               {
+                       if ((session[s].ip & session[s].route[r].mask) ==
+                           (session[s].route[r].ip & session[s].route[r].mask))
+                               routed++;
 
 
-       for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
-               routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 1);
+                       routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 1);
+               }
+
+               // Static IPs need to be routed if not already
+               // convered by a Framed-Route.  Anything else is part
+               // of the IP address pool and is already routed, it
+               // just needs to be added to the IP cache.
+               if (session[s].ip_pool_index == -1) // static ip
+               {
+                       if (!routed) routeset(s, session[s].ip, 0, 0, 1);
+               }
+               else
+                       cache_ipmap(session[s].ip, s);
+       }
 
        if (!session[s].unique_id)
        {
 
        if (!session[s].unique_id)
        {
@@ -3632,6 +3633,7 @@ int sessionsetup(tunnelidt t, sessionidt s)
 int load_session(sessionidt s, sessiont *new)
 {
        int i;
 int load_session(sessionidt s, sessiont *new)
 {
        int i;
+       int newip = 0;
 
                // Sanity checks.
        if (new->ip_pool_index >= MAXIPPOOL ||
 
                // Sanity checks.
        if (new->ip_pool_index >= MAXIPPOOL ||
@@ -3649,48 +3651,66 @@ int load_session(sessionidt s, sessiont *new)
 
        session[s].tunnel = new->tunnel; // For logging in cache_ipmap
 
 
        session[s].tunnel = new->tunnel; // For logging in cache_ipmap
 
+       // See if routes/ip cache need updating
+       if (new->ip != session[s].ip)
+               newip++;
 
 
-       if (new->ip != session[s].ip)   // Changed ip. fix up hash tables.
+       for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
+               if (new->route[i].ip != session[s].route[i].ip ||
+                   new->route[i].mask != session[s].route[i].mask)
+                       newip++;
+
+       // needs update
+       if (newip)
        {
        {
-               if (session[s].ip)      // If there's an old one, remove it.
+               int routed = 0;
+
+               // remove old routes...
+               for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
                {
                {
-                       // Remove any routes if the IP has changed
-                       for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
-                       {
-                               routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
-                               session[s].route[i].ip = 0;
-                       }
+                       if ((session[s].ip & session[s].route[i].mask) ==
+                           (session[s].route[i].ip & session[s].route[i].mask))
+                               routed++;
 
 
+                       routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
+               }
+
+               // ...ip
+               if (session[s].ip)
+               {
                        if (session[s].ip_pool_index == -1) // static IP
                        if (session[s].ip_pool_index == -1) // static IP
-                               routeset(s, session[s].ip, 0, 0, 0);
+                       {
+                               if (!routed) routeset(s, session[s].ip, 0, 0, 0);
+                       }
                        else            // It's part of the IP pool, remove it manually.
                                uncache_ipmap(session[s].ip);
                }
 
                        else            // It's part of the IP pool, remove it manually.
                                uncache_ipmap(session[s].ip);
                }
 
+               routed = 0;
+
+               // add new routes...
+               for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
+               {
+                       if ((new->ip & new->route[i].mask) ==
+                           (new->route[i].ip & new->route[i].mask))
+                               routed++;
+
+                       routeset(s, new->route[i].ip, new->route[i].mask, 0, 1);
+               }
+
+               // ...ip
                if (new->ip)
                {
                        // If there's a new one, add it.
                        if (new->ip_pool_index == -1)
                if (new->ip)
                {
                        // If there's a new one, add it.
                        if (new->ip_pool_index == -1)
-                               routeset(s, new->ip, 0, 0, 1);
+                       {
+                               if (!routed) routeset(s, new->ip, 0, 0, 1);
+                       }
                        else
                                cache_ipmap(new->ip, s);
                }
        }
 
                        else
                                cache_ipmap(new->ip, s);
                }
        }
 
-       // Update routed networks
-       for (i = 0; i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
-       {
-               if (new->route[i].ip == session[s].route[i].ip &&
-                   new->route[i].mask == session[s].route[i].mask)
-                       continue;
-
-               if (session[s].route[i].ip) // Remove the old one if it exists.
-                       routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
-
-               if (new->route[i].ip)   // Add the new one if it exists.
-                       routeset(s, new->route[i].ip, new->route[i].mask, 0, 1);
-       }
-
        if (new->tunnel && s > config->cluster_highest_sessionid)       // Maintain this in the slave. It's used
                                        // for walking the sessions to forward byte counts to the master.
                config->cluster_highest_sessionid = s;
        if (new->tunnel && s > config->cluster_highest_sessionid)       // Maintain this in the slave. It's used
                                        // for walking the sessions to forward byte counts to the master.
                config->cluster_highest_sessionid = s;
@@ -3752,7 +3772,7 @@ static void *getconfig(char *key, enum config_typet type)
        return 0;
 }
 
        return 0;
 }
 
-static void add_plugin(char *plugin_name)
+static int add_plugin(char *plugin_name)
 {
        static struct pluginfuncs funcs = {
                _log,
 {
        static struct pluginfuncs funcs = {
                _log,
@@ -3761,10 +3781,12 @@ static void add_plugin(char *plugin_name)
                sessionbyuser,
                sessiontbysessionidt,
                sessionidtbysessiont,
                sessionbyuser,
                sessiontbysessionidt,
                sessionidtbysessiont,
-               sessionkill,
                radiusnew,
                radiussend,
                getconfig,
                radiusnew,
                radiussend,
                getconfig,
+               sessionkill,
+               throttle_session,
+               cluster_send_session,
        };
 
        void *p = open_plugin(plugin_name, 1);
        };
 
        void *p = open_plugin(plugin_name, 1);
@@ -3774,22 +3796,22 @@ static void add_plugin(char *plugin_name)
        if (!p)
        {
                LOG(1, 0, 0, 0, "   Plugin load failed: %s\n", dlerror());
        if (!p)
        {
                LOG(1, 0, 0, 0, "   Plugin load failed: %s\n", dlerror());
-               return;
+               return -1;
        }
 
        if (ll_contains(loaded_plugins, p))
        {
                dlclose(p);
        }
 
        if (ll_contains(loaded_plugins, p))
        {
                dlclose(p);
-               return;
+               return 0; // already loaded
        }
 
        {
        }
 
        {
-               int *v = dlsym(p, "__plugin_api_version");
+               int *v = dlsym(p, "plugin_api_version");
                if (!v || *v != PLUGIN_API_VERSION)
                {
                        LOG(1, 0, 0, 0, "   Plugin load failed: API version mismatch: %s\n", dlerror());
                        dlclose(p);
                if (!v || *v != PLUGIN_API_VERSION)
                {
                        LOG(1, 0, 0, 0, "   Plugin load failed: API version mismatch: %s\n", dlerror());
                        dlclose(p);
-                       return;
+                       return -1;
                }
        }
 
                }
        }
 
@@ -3799,7 +3821,7 @@ static void add_plugin(char *plugin_name)
                {
                        LOG(1, 0, 0, 0, "   Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
                        dlclose(p);
                {
                        LOG(1, 0, 0, 0, "   Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
                        dlclose(p);
-                       return;
+                       return -1;
                }
        }
 
                }
        }
 
@@ -3816,6 +3838,7 @@ static void add_plugin(char *plugin_name)
        }
 
        LOG(2, 0, 0, 0, "   Loaded plugin %s\n", plugin_name);
        }
 
        LOG(2, 0, 0, 0, "   Loaded plugin %s\n", plugin_name);
+       return 1;
 }
 
 static void run_plugin_done(void *plugin)
 }
 
 static void run_plugin_done(void *plugin)
@@ -3826,45 +3849,51 @@ static void run_plugin_done(void *plugin)
                donefunc();
 }
 
                donefunc();
 }
 
-static void remove_plugin(char *plugin_name)
+static int remove_plugin(char *plugin_name)
 {
        void *p = open_plugin(plugin_name, 0);
 {
        void *p = open_plugin(plugin_name, 0);
-       int i;
+       int loaded = 0;
 
        if (!p)
 
        if (!p)
-               return;
-
-       for (i = 0; i < max_plugin_functions; i++)
-       {
-               void *x;
-               if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
-                       ll_delete(plugins[i], x);
-       }
+               return -1;
 
        if (ll_contains(loaded_plugins, p))
        {
 
        if (ll_contains(loaded_plugins, p))
        {
+               int i;
+               for (i = 0; i < max_plugin_functions; i++)
+               {
+                       void *x;
+                       if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
+                               ll_delete(plugins[i], x);
+               }
+
                ll_delete(loaded_plugins, p);
                run_plugin_done(p);
                ll_delete(loaded_plugins, p);
                run_plugin_done(p);
+               loaded = 1;
        }
 
        dlclose(p);
        LOG(2, 0, 0, 0, "Removed plugin %s\n", plugin_name);
        }
 
        dlclose(p);
        LOG(2, 0, 0, 0, "Removed plugin %s\n", plugin_name);
+       return loaded;
 }
 
 int run_plugins(int plugin_type, void *data)
 {
        int (*func)(void *data);
 }
 
 int run_plugins(int plugin_type, void *data)
 {
        int (*func)(void *data);
-       if (!plugins[plugin_type] || plugin_type > max_plugin_functions) return 1;
+
+       if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
+               return PLUGIN_RET_ERROR;
 
        ll_reset(plugins[plugin_type]);
        while ((func = ll_next(plugins[plugin_type])))
        {
 
        ll_reset(plugins[plugin_type]);
        while ((func = ll_next(plugins[plugin_type])))
        {
-               int rc;
-               rc = func(data);
-               if (rc == PLUGIN_RET_STOP) return 1;
-               if (rc == PLUGIN_RET_ERROR) return 0;
+               int r = func(data);
+
+               if (r != PLUGIN_RET_OK)
+                       return r; // stop here
        }
        }
-       return 1;
+
+       return PLUGIN_RET_OK;
 }
 
 static void plugins_done()
 }
 
 static void plugins_done()
@@ -3876,39 +3905,174 @@ static void plugins_done()
                run_plugin_done(p);
 }
 
                run_plugin_done(p);
 }
 
-static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr)
+static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr, int alen)
 {
 {
-       char *resp;
-       int l;
-       struct param_control param = { buf, len, ntohl(addr->sin_addr.s_addr), ntohs(addr->sin_port), NULL, 0, 0 };
-
+       struct nsctl request;
+       struct nsctl response;
+       int type = unpack_control(&request, buf, len);
+       int r;
+       void *p;
 
        if (log_stream && config->debug >= 4)
        {
 
        if (log_stream && config->debug >= 4)
        {
-               LOG(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Received ");
-               dump_packet(buf, log_stream);
+               if (type < 0)
+               {
+                       LOG(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Bogus control message (%d)\n", type);
+               }
+               else
+               {
+                       LOG(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Received ");
+                       dump_control(&request, log_stream);
+               }
        }
 
        }
 
-       resp = calloc(1400, 1);
-       l = new_packet(PKT_RESP_ERROR, resp);
-       *(int *)(resp + 6) = *(int *)(buf + 6);
+       switch (type)
+       {
+       case NSCTL_REQ_LOAD:
+               if (request.argc != 1)
+               {
+                       response.type = NSCTL_RES_ERR;
+                       response.argc = 1;
+                       response.argv[0] = "name of plugin required";
+               }
+               else if ((r = add_plugin(request.argv[0])) < 1)
+               {
+                       response.type = NSCTL_RES_ERR;
+                       response.argc = 1;
+                       response.argv[0] = !r
+                               ? "plugin already loaded"
+                               : "error loading plugin";
+               }
+               else
+               {
+                       response.type = NSCTL_RES_OK;
+                       response.argc = 0;
+               }
+
+               break;
+
+       case NSCTL_REQ_UNLOAD:
+               if (request.argc != 1)
+               {
+                       response.type = NSCTL_RES_ERR;
+                       response.argc = 1;
+                       response.argv[0] = "name of plugin required";
+               }
+               else if ((r = remove_plugin(request.argv[0])) < 1)
+               {
+                       response.type = NSCTL_RES_ERR;
+                       response.argc = 1;
+                       response.argv[0] = !r
+                               ? "plugin not loaded"
+                               : "plugin not found";
+               }
+               else
+               {
+                       response.type = NSCTL_RES_OK;
+                       response.argc = 0;
+               }
 
 
-       param.type = ntohs(*(short *)(buf + 2));
-       param.id = ntohl(*(int *)(buf + 6));
-       param.data_length = ntohs(*(short *)(buf + 4)) - 10;
-       param.data = (param.data_length > 0) ? (char *)(buf + 10) : NULL;
-       param.response = resp;
-       param.response_length = l;
+               break;
 
 
-       run_plugins(PLUGIN_CONTROL, &param);
+       case NSCTL_REQ_HELP:
+               response.type = NSCTL_RES_OK;
+               response.argc = 0;
 
 
-       if (param.send_response)
+               ll_reset(loaded_plugins);
+               while ((p = ll_next(loaded_plugins)))
+               {
+                       char **help = dlsym(p, "plugin_control_help");
+                       while (response.argc < 0xff && help && *help)
+                               response.argv[response.argc++] = *help++;
+               }
+
+               break;
+
+       case NSCTL_REQ_CONTROL:
+               {
+                       struct param_control param = {
+                               config->cluster_iam_master,
+                               request.argc,
+                               request.argv,
+                               0,
+                               NULL,
+                       };
+
+                       int r = run_plugins(PLUGIN_CONTROL, &param);
+
+                       if (r == PLUGIN_RET_ERROR)
+                       {
+                               response.type = NSCTL_RES_ERR;
+                               response.argc = 1;
+                               response.argv[0] = param.additional
+                                       ? param.additional
+                                       : "error returned by plugin";
+                       }
+                       else if (r == PLUGIN_RET_NOTMASTER)
+                       {
+                               static char msg[] = "must be run on master: 000.000.000.000";
+
+                               response.type = NSCTL_RES_ERR;
+                               response.argc = 1;
+                               if (config->cluster_master_address)
+                               {
+                                       strcpy(msg + 23, inet_toa(config->cluster_master_address));
+                                       response.argv[0] = msg;
+                               }
+                               else
+                               {
+                                       response.argv[0] = "must be run on master: none elected";
+                               }
+                       }
+                       else if (!(param.response & NSCTL_RESPONSE))
+                       {
+                               response.type = NSCTL_RES_ERR;
+                               response.argc = 1;
+                               response.argv[0] = param.response
+                                       ? "unrecognised response value from plugin"
+                                       : "unhandled action";
+                       }
+                       else
+                       {
+                               response.type = param.response;
+                               response.argc = 0;
+                               if (param.additional)
+                               {
+                                       response.argc = 1;
+                                       response.argv[0] = param.additional;
+                               }
+                       }
+               }
+
+               break;
+
+       default:
+               response.type = NSCTL_RES_ERR;
+               response.argc = 1;
+               response.argv[0] = "error unpacking control packet";
+       }
+
+       buf = calloc(NSCTL_MAX_PKT_SZ, 1);
+       if (!buf)
        {
        {
-               send_packet(controlfd, ntohl(addr->sin_addr.s_addr), ntohs(addr->sin_port), param.response, param.response_length);
-               LOG(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Sent Control packet response\n");
+               LOG(2, ntohl(addr->sin_addr.s_addr), 0, 0, "Failed to allocate nsctl response\n");
+               return;
        }
 
        }
 
-       free(resp);
+       r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
+       if (r > 0)
+       {
+               sendto(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen);
+               if (log_stream && config->debug >= 4)
+               {
+                       LOG(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Sent ");
+                       dump_control(&response, log_stream);
+               }
+       }
+       else
+               LOG(2, ntohl(addr->sin_addr.s_addr), 0, 0, "Failed to pack nsctl response (%d)\n", r);
+
+       free(buf);
 }
 
 static tunnelidt new_tunnel()
 }
 
 static tunnelidt new_tunnel()
for cloning use: "git clone git://git.sameswireless.fr/l2tpns.git" ; For add to your sources.list: "deb http://package.sameswifi.fr/ jessie main"