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Sourcecode: l2tpns version File versions  Download package

autosnoop.c

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

/* set up intercept based on RADIUS reply */

char const *cvs_id = "$Id: autosnoop.c,v 1.12 2005/10/11 09:04:53 bodea Exp $";

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

int plugin_radius_response(struct param_radius_response *data)
{
    if (!strcmp(data->key, "intercept"))
    {
      char *p;
      data->s->snoop_ip = 0;
      data->s->snoop_port = 0;
      if ((p = strchr(data->value, ':')))
      {
          *p++ = 0;
          if (*data->value)
            data->s->snoop_ip = inet_addr(data->value);

          if (data->s->snoop_ip == INADDR_NONE)
            data->s->snoop_ip = 0;

          if (*p)
            data->s->snoop_port = atoi(p);

          f->log(3, f->get_id_by_session(data->s), data->s->tunnel,
            "         Intercepting user to %s:%d\n",
            f->fmtaddr(data->s->snoop_ip, 0), data->s->snoop_port);
      }
      else
      {
          f->log(3, f->get_id_by_session(data->s), data->s->tunnel,
                "         Not Intercepting user (reply string should"
                " be intercept=ip:port)\n");
      }
    }

      return PLUGIN_RET_OK;
}

int plugin_radius_reset(struct param_radius_reset *data)
{
    data->s->snoop_ip = 0;
    data->s->snoop_port = 0;
    return PLUGIN_RET_OK;
}

int plugin_radius_account(struct param_radius_account *data)
{
    if (data->s->snoop_ip && data->s->snoop_port)
    {
      uint8_t *p = *data->packet;

      *p = 26;                      // vendor-specific
      *(uint32_t *) (p + 2) = htonl(9);   // Cisco
      p[6] = 1;                     // Cisco-AVPair
      p[7] = 2 + sprintf((char *) p + 8, "intercept=%s:%d",
          f->fmtaddr(data->s->snoop_ip, 0), data->s->snoop_port);

      p[1] = p[7] + 6;
      *data->packet += p[1];
    }

    return PLUGIN_RET_OK;
}

int plugin_init(struct pluginfuncs *funcs)
{
    return ((f = funcs)) ? 1 : 0;
}

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