- Add startup-config(5) manpage [FIXME].

[l2tpns.git] / garden.c

diff --git a/garden.c b/garden.c
index 7477089..ba228cd 100644 (file)
--- a/garden.c
+++ b/garden.c
@@ -7,18 +7,23 @@
 #include "plugin.h"
 #include "control.h"
 
-int __plugin_api_version = 1;
+/* walled garden */
+
+char const *cvs_id = "$Id: garden.c,v 1.13 2004-11-17 08:23:34 bodea Exp $";
+
+int plugin_api_version = PLUGIN_API_VERSION;
 static struct pluginfuncs *p = 0;
 
 static int iam_master = 0;     // We're all slaves! Slaves I tell you!
 
 char *up_commands[] = {
-       "iptables -t nat -N garden >/dev/null 2>&1",    // Create a chain that all gardened users will go through
+       "iptables -t nat -N garden >/dev/null 2>&1",                    // Create a chain that all gardened users will go through
        "iptables -t nat -F garden",
-       ". " PLUGINCONF "/build-garden",                // Populate with site-specific DNAT rules
-       "iptables -t nat -N garden_users >/dev/null 2>&1",// Empty chain, users added/removed by garden_session
+       ". " PLUGINCONF "/build-garden",                                // Populate with site-specific DNAT rules
+       "iptables -t nat -N garden_users >/dev/null 2>&1",              // Empty chain, users added/removed by garden_session
        "iptables -t nat -F garden_users",
-       "iptables -t nat -A PREROUTING -j garden_users",        // DNAT any users on the garden_users chain
+       "iptables -t nat -A PREROUTING -j garden_users",                // DNAT any users on the garden_users chain
+       "sysctl -w net.ipv4.ip_conntrack_max=256000 >/dev/null",        // lots of entries
        NULL,
 };
 
@@ -28,7 +33,10 @@ char *down_commands[] = {
        "iptables -t nat -X garden_users",
        "iptables -t nat -F garden",
        "iptables -t nat -X garden",
-       "rmmod iptable_nat ip_conntrack",
+       "rmmod iptable_nat",    // Should also remove ip_conntrack, but
+                               // doing so can take hours...  literally.
+                               // If a master is re-started as a slave,
+                               // either rmmod manually, or reboot.
        NULL,
 };
 
@@ -67,46 +75,62 @@ int plugin_kill_session(struct param_new_session *data)
        return PLUGIN_RET_OK;
 }
 
+char *plugin_control_help[] = {
+       "  garden USER|SID       Put user into the walled garden",
+       "  ungarden USER|SID     Release user",
+       0
+};
+
 int plugin_control(struct param_control *data)
 {
-       sessiont *s;
        sessionidt session;
+       sessiont *s = 0;
+       int flag;
+       char *end;
+
+       if (data->argc < 1 || (strcmp(data->argv[0], "garden") && strcmp(data->argv[0], "ungarden")))
+               return PLUGIN_RET_OK; // not for us
+
+       flag = data->argv[0][0] == 'g';
 
        if (!iam_master)        // All garden processing happens on the master.
-               return PLUGIN_RET_OK;
+       {
+               data->response = NSCTL_RES_ERR;
+               data->additional = "must be run on the cluster master";
+               return PLUGIN_RET_STOP;
+       }
 
-       if (data->type != PKT_GARDEN && data->type != PKT_UNGARDEN)
-               return PLUGIN_RET_OK;
+       if (data->argc != 2)
+       {
+               data->response = NSCTL_RES_ERR;
+               data->additional = "one argument required: username or session id";
+               return PLUGIN_RET_STOP;
+       }
 
-       if (!data->data && data->data_length)
-               return PLUGIN_RET_OK;
+       if (!(session = strtol(data->argv[0], &end, 10)) || *end)
+               session = p->get_session_by_username(data->argv[0]);
 
-       session = atoi((char*)(data->data));
-       if (!session)
-               return PLUGIN_RET_OK;
+       if (session)
+               s = p->get_session_by_id(session);
 
-       data->send_response = 1;
-       s = p->get_session_by_id(session);
        if (!s || !s->ip)
        {
-               char *errormsg = "Session not connected";
-               *(short *)(data->response + 2) = ntohs(PKT_RESP_ERROR);
-               sprintf((data->response + data->response_length), "%s", errormsg);
-               data->response_length += strlen(errormsg) + 1;
-
-               p->log(3, 0, 0, 0, "Unknown session %d\n", session);
+               data->response = NSCTL_RES_ERR;
+               data->additional = "session not found";
                return PLUGIN_RET_STOP;
        }
-       *(short *)(data->response + 2) = ntohs(PKT_RESP_OK);
 
-       if (!(garden_session(s, (data->type == PKT_GARDEN))))
+       if (s->walled_garden == flag)
        {
-               char *errormsg = "User not connected";
-               *(short *)(data->response + 2) = ntohs(PKT_RESP_ERROR);
-               sprintf((data->response + data->response_length), "%s", errormsg);
-               data->response_length += strlen(errormsg) + 1;
+               data->response = NSCTL_RES_ERR;
+               data->additional = flag ? "already in walled garden" : "not in walled garden";
+               return PLUGIN_RET_STOP;
        }
 
+       garden_session(s, flag);
+       data->response = NSCTL_RES_OK;
+       data->additional = 0;
+
        return PLUGIN_RET_STOP;
 }
 
@@ -128,7 +152,10 @@ int plugin_become_master(void)
 int plugin_new_session_master(sessiont * s)
 {      
        if (s->walled_garden)
+       {
+               s->walled_garden = 0;
                garden_session(s, 1);
+       }
 
        return PLUGIN_RET_OK;
 }
@@ -143,7 +170,7 @@ int garden_session(sessiont *s, int flag)
        if (flag == 1)
        {
                p->log(2, 0, 0, s->tunnel, "Garden user %s (%s)\n", s->user, p->inet_toa(htonl(s->ip)));
-               snprintf(cmd, 2048, "iptables -t nat -A garden_users -s %s -j garden", p->inet_toa(htonl(s->ip)));
+               snprintf(cmd, sizeof(cmd), "iptables -t nat -A garden_users -s %s -j garden", p->inet_toa(htonl(s->ip)));
                p->log(3, 0, 0, s->tunnel, "%s\n", cmd);
                system(cmd);
                s->walled_garden = 1;
@@ -164,7 +191,7 @@ int garden_session(sessiont *s, int flag)
                s->cin = s->cout = 0;
                s->pin = s->pout = 0;
 
-               snprintf(cmd, 2048, "iptables -t nat -D garden_users -s %s -j garden", p->inet_toa(htonl(s->ip)));
+               snprintf(cmd, sizeof(cmd), "iptables -t nat -D garden_users -s %s -j garden", p->inet_toa(htonl(s->ip)));
                p->log(3, 0, 0, s->tunnel, "%s\n", cmd);
                while (--count)
                {