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Sourcecode: l2tpns version File versions

snoopctl.c

#include <string.h>
#include "l2tpns.h"
#include "plugin.h"
#include "control.h"

/* snoop control */

char const *cvs_id = "$Id: snoopctl.c,v 1.4 2004/12/16 08:49:53 bodea Exp $";

int plugin_api_version = PLUGIN_API_VERSION;
static struct pluginfuncs *p = 0;

char *plugin_control_help[] = {
      "  snoop USER|SID IP PORT                      Intercept user traffic",
      "  unsnoop USER|SID                            Stop intercepting user",
      0
};

int plugin_init(struct pluginfuncs *funcs)
{
      if (!funcs)
            return 0;

      p = funcs;
      return 1;
}

int plugin_control(struct param_control *data)
{
      sessionidt session;
      sessiont *s = 0;
      int flag;
      char *end;

      if (data->argc < 1)
            return PLUGIN_RET_OK;

      if (strcmp(data->argv[0], "snoop") && strcmp(data->argv[0], "unsnoop"))
            return PLUGIN_RET_OK; // not for us

      if (!data->iam_master)
            return PLUGIN_RET_NOTMASTER;

      flag = data->argv[0][0] != 'u';

      if (flag)
      {
            if (data->argc != 4)
            {
                  data->response = NSCTL_RES_ERR;
                  data->additional = "requires username or session id and host, port";
                  return PLUGIN_RET_STOP;
            }
      }
      else
      {
            if (data->argc != 2)
            {
                  data->response = NSCTL_RES_ERR;
                  data->additional = "requires username or session id";
                  return PLUGIN_RET_STOP;
            }
      }

      if (!(session = strtol(data->argv[1], &end, 10)) || *end)
            session = p->get_session_by_username(data->argv[1]);

      if (session)
            s = p->get_session_by_id(session);

      if (!s || !s->ip)
      {
            data->response = NSCTL_RES_ERR;
            data->additional = "session not found";
            return PLUGIN_RET_STOP;
      }

      if (flag)
      {
            in_addr_t ip = inet_addr(data->argv[2]);
            uint16_t port = atoi(data->argv[3]);

            if (!ip || ip == INADDR_NONE)
            {
                  data->response = NSCTL_RES_ERR;
                  data->additional = "invalid ip address";
                  return PLUGIN_RET_STOP;
            }

            if (!port)
            {
                  data->response = NSCTL_RES_ERR;
                  data->additional = "invalid port";
                  return PLUGIN_RET_STOP;
            }

            if (ip == s->snoop_ip && port == s->snoop_port)
            {
                  data->response = NSCTL_RES_ERR;
                  data->additional = "already intercepted";
                  return PLUGIN_RET_STOP;
            }

            s->snoop_ip = ip;
            s->snoop_port = port;
      }
      else
      {
            if (!s->snoop_ip)
            {
                  data->response = NSCTL_RES_ERR;
                  data->additional = "not intercepted";
                  return PLUGIN_RET_STOP;
            }

            s->snoop_ip = 0;
            s->snoop_port = 0;
      }

      p->session_changed(session);

      data->response = NSCTL_RES_OK;
      data->additional = 0;

      return PLUGIN_RET_STOP;
}

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