autosnoop.c

   1 #include <string.h>
   2 #include "l2tpns.h"
   3 #include "plugin.h"
   4
   5 /* set up intercept based on RADIUS reply */
   6
   7 char const *cvs_id = "$Id: autosnoop.c,v 1.12 2005/10/11 09:04:53 bodea Exp $";
   8
   9 int plugin_api_version = PLUGIN_API_VERSION;
  10 static struct pluginfuncs *f = 0;
  11
  12 int plugin_radius_response(struct param_radius_response *data)
  13 {
  14     if (!strcmp(data->key, "intercept"))
  15     {
  16         char *p;
  17         data->s->snoop_ip = 0;
  18         data->s->snoop_port = 0;
  19         if ((p = strchr(data->value, ':')))
  20         {
  21             *p++ = 0;
  22             if (*data->value)
  23                 data->s->snoop_ip = inet_addr(data->value);
  24
  25             if (data->s->snoop_ip == INADDR_NONE)
  26                 data->s->snoop_ip = 0;
  27
  28             if (*p)
  29                 data->s->snoop_port = atoi(p);
  30
  31             f->log(3, f->get_id_by_session(data->s), data->s->tunnel,
  32                 "         Intercepting user to %s:%d\n",
  33                 f->fmtaddr(data->s->snoop_ip, 0), data->s->snoop_port);
  34         }
  35         else
  36         {
  37             f->log(3, f->get_id_by_session(data->s), data->s->tunnel,
  38                     "         Not Intercepting user (reply string should"
  39                     " be intercept=ip:port)\n");
  40         }
  41     }
  42
  43         return PLUGIN_RET_OK;
  44 }
  45
  46 int plugin_radius_reset(struct param_radius_reset *data)
  47 {
  48     data->s->snoop_ip = 0;
  49     data->s->snoop_port = 0;
  50     return PLUGIN_RET_OK;
  51 }
  52
  53 int plugin_radius_account(struct param_radius_account *data)
  54 {
  55     if (data->s->snoop_ip && data->s->snoop_port)
  56     {
  57         uint8_t *p = *data->packet;
  58
  59         *p = 26;                                // vendor-specific
  60         *(uint32_t *) (p + 2) = htonl(9);       // Cisco
  61         p[6] = 1;                               // Cisco-AVPair
  62         p[7] = 2 + sprintf((char *) p + 8, "intercept=%s:%d",
  63             f->fmtaddr(data->s->snoop_ip, 0), data->s->snoop_port);
  64
  65         p[1] = p[7] + 6;
  66         *data->packet += p[1];
  67     }
  68
  69     return PLUGIN_RET_OK;
  70 }
  71
  72 int plugin_init(struct pluginfuncs *funcs)
  73 {
  74     return ((f = funcs)) ? 1 : 0;
  75 }