radius.c

   1 // L2TPNS Radius Stuff
   2
   3 char const *cvs_id_radius = "$Id: radius.c,v 1.5 2004/06/28 02:43:13 fred_nerk Exp $";
   4
   5 #include <time.h>
   6 #include <stdio.h>
   7 #include <sys/types.h>
   8 #include <sys/socket.h>
   9 #include <malloc.h>
  10 #include <string.h>
  11 #include <fcntl.h>
  12 #include <arpa/inet.h>
  13 #include <ctype.h>
  14 #include <netinet/in.h>
  15 #include "md5.h"
  16 #include "constants.h"
  17 #include "l2tpns.h"
  18 #include "plugin.h"
  19 #include "util.h"
  20
  21 extern radiust *radius;
  22 extern sessiont *session;
  23 extern tunnelt *tunnel;
  24 extern u32 sessionid;
  25 extern struct configt *config;
  26 extern int *radfds;
  27
  28 const char *radius_state(int state)
  29 {
  30         static char *tmp = NULL;
  31         int i;
  32         for (i = 0; radius_states[i]; i++)
  33                 if (i == state) return radius_states[i];
  34
  35         if (tmp == NULL) tmp = (char *)calloc(64, 1);
  36         sprintf(tmp, "%d", state);
  37         return tmp;
  38 }
  39
  40 // Set up socket for radius requests
  41 void initrad(void)
  42 {
  43         int i;
  44         log(3, 0, 0, 0, "Creating %d sockets for RADIUS queries\n", config->num_radfds);
  45         radfds = calloc(sizeof(int), config->num_radfds);
  46         for (i = 0; i < config->num_radfds; i++)
  47         {
  48                 int flags;
  49                 if (!radfds[i]) radfds[i] = socket(AF_INET, SOCK_DGRAM, UDP);
  50                 flags = fcntl(radfds[i], F_GETFL, 0);
  51                 fcntl(radfds[i], F_SETFL, flags | O_NONBLOCK);
  52         }
  53 }
  54
  55 void radiusclear(u16 r, sessionidt s)
  56 {
  57         if (s) session[s].radius = 0;
  58         memset(&radius[r], 0, sizeof(radius[r])); // radius[r].state = RADIUSNULL;
  59 }
  60
  61
  62 static u16 new_radius()
  63 {
  64         int count;
  65         static u32 next_radius_id = 0;
  66
  67         for (count = MAXRADIUS; count > 0 ; --count)
  68         {
  69                 ++next_radius_id;               // Find the next ID to check.
  70                 if (next_radius_id >= MAXRADIUS)
  71                         next_radius_id = 1;
  72
  73                 if (radius[next_radius_id].state == RADIUSNULL)
  74                 {
  75                         return next_radius_id;
  76                 }
  77
  78                 }
  79                                 log(0, 0, 0, 0, "Can't find a free radius session! This is very bad!\n");
  80                                 return 0;
  81 }
  82
  83 u16 radiusnew(sessionidt s)
  84 {
  85         u16 r;
  86         if (!(r = new_radius()))
  87         {
  88                 log(1, 0, s, session[s].tunnel, "No free RADIUS sessions\n");
  89                 STAT(radius_overflow);
  90                 return 0;
  91         };
  92         memset(&radius[r], 0, sizeof(radius[r]));
  93         session[s].radius = r;
  94         radius[r].session = s;
  95         radius[r].state = RADIUSWAIT;
  96         radius[r].retry = TIME + 1200; // Wait at least 120 seconds to re-claim this.
  97
  98         log(3,0,s, session[s].tunnel, "Allocated radius %d\n", r);
  99         return r;
 100 }
 101
 102 // Send a RADIUS request
 103 void radiussend(u16 r, u8 state)
 104 {
 105         struct sockaddr_in addr;
 106         u8 b[4096];            // RADIUS packet
 107         char pass[129];
 108         int pl;
 109         u8 *p;
 110         sessionidt s;
 111
 112         CSTAT(call_radiussend);
 113
 114         s = radius[r].session;
 115         if (!config->numradiusservers)
 116         {
 117                 log(0, 0, s, session[s].tunnel, "No RADIUS servers\n");
 118                 return;
 119         }
 120         if (!*config->radiussecret)
 121         {
 122                 log(0, 0, s, session[s].tunnel, "No RADIUS secret\n");
 123                 return;
 124         }
 125
 126         if (state != RADIUSAUTH && !config->radius_accounting)
 127         {
 128                 // Radius accounting is turned off
 129                 radiusclear(r, s);
 130                 return;
 131         }
 132
 133         if (radius[r].state != state)
 134                 radius[r].try = 0;
 135         radius[r].state = state;
 136         radius[r].retry = backoff(radius[r].try++);
 137         log(4, 0, s, session[s].tunnel, "Send RADIUS id %d sock %d state %s try %d\n",
 138                         r >> RADIUS_SHIFT, r & RADIUS_MASK,
 139                         radius_state(radius[r].state), radius[r].try);
 140         if (radius[r].try > config->numradiusservers * 2)
 141         {
 142                 if (s)
 143                 {
 144                         if (state == RADIUSAUTH)
 145                                 sessionshutdown(s, "RADIUS timeout");
 146                         else
 147                         {
 148                                 log(1, 0, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",
 149                                         radius_states[state]);
 150                                 radiusclear(r, s);
 151                         }
 152                         STAT(radius_timeout);
 153                 }
 154                 else
 155                 {
 156                         STAT(radius_retries);
 157                         radius[r].state = RADIUSWAIT;
 158                         radius[r].retry = 100;
 159                 }
 160                 return ;
 161         }
 162         // contruct RADIUS access request
 163         switch (state)
 164         {
 165                 case RADIUSAUTH:
 166                         b[0] = 1;               // access request
 167                         break;
 168                 case RADIUSSTART:
 169                 case RADIUSSTOP:
 170                         b[0] = 4;               // accounting request
 171                         break;
 172                 default:
 173                         log(0, 0, 0, 0, "Unknown radius state %d\n", state);
 174         }
 175         b[1] = r >> RADIUS_SHIFT;       // identifier
 176         memcpy(b + 4, radius[r].auth, 16);
 177         p = b + 20;
 178         if (s)
 179         {
 180                 *p = 1;                 // user name
 181                 p[1] = strlen(session[s].user) + 2;
 182                 strcpy(p + 2, session[s].user);
 183                 p += p[1];
 184         }
 185         if (state == RADIUSAUTH)
 186         {
 187                 if (radius[r].chap)
 188                 {
 189                         *p = 3;            // CHAP password
 190                         p[1] = 19;         // length
 191                         p[2] = radius[r].id; // ID
 192                         memcpy(p + 3, radius[r].pass, 16); // response from CHAP request
 193                         p += p[1];
 194                         *p = 60;           // CHAP Challenge
 195                         p[1] = 18;         // length
 196                         memcpy(p + 2, radius[r].auth, 16);
 197                         p += p[1];
 198                 }
 199                 else
 200                 {
 201                         strcpy(pass, radius[r].pass);
 202                         pl = strlen(pass);
 203                         while (pl & 15)
 204                                 pass[pl++] = 0; // pad
 205                         if (pl)
 206                         {                // encrypt
 207                                 hasht hash;
 208                                 int p = 0;
 209                                 while (p < pl)
 210                                 {
 211                                         MD5_CTX ctx;
 212                                         MD5Init(&ctx);
 213                                         MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
 214                                         if (p)
 215                                                 MD5Update(&ctx, pass + p - 16, 16);
 216                                         else
 217                                                 MD5Update(&ctx, radius[r].auth, 16);
 218                                         MD5Final(hash, &ctx);
 219                                         do
 220                                         {
 221                                                 pass[p] ^= hash[p & 15];
 222                                                 p++;
 223                                         }
 224                                         while (p & 15);
 225                                 }
 226                         }
 227                         *p = 2;            // password
 228                         p[1] = pl + 2;
 229                         if (pl)
 230                                 memcpy(p + 2, pass, pl);
 231                         p += p[1];
 232                 }
 233         }
 234         else if (state == RADIUSSTART || state == RADIUSSTOP)
 235         {                          // accounting
 236                 *p = 40;                // accounting type
 237                 p[1] = 6;
 238                 *(u32 *) (p + 2) = htonl((state == RADIUSSTART) ? 1 : 2);
 239                 p += p[1];
 240                 if (s)
 241                 {
 242                         *p = 44;           // session ID
 243                         p[1] = 18;
 244                         sprintf(p + 2, "%08X%08X", session[s].id, session[s].opened);
 245                         p += p[1];
 246                         if (state == RADIUSSTOP)
 247                         {                // stop
 248                                 *p = 42;      // input octets
 249                                 p[1] = 6;
 250                                 *(u32 *) (p + 2) = htonl(session[s].cin);
 251                                 p += p[1];
 252                                 *p = 43;      // output octets
 253                                 p[1] = 6;
 254                                 *(u32 *) (p + 2) = htonl(session[s].cout);
 255                                 p += p[1];
 256                                 *p = 46;      // session time
 257                                 p[1] = 6;
 258                                 *(u32 *) (p + 2) = htonl(time(NULL) - session[s].opened);
 259                                 p += p[1];
 260                                 *p = 47;      // input packets
 261                                 p[1] = 6;
 262                                 *(u32 *) (p + 2) = htonl(session[s].pin);
 263                                 p += p[1];
 264                                 *p = 48;      // output spackets
 265                                 p[1] = 6;
 266                                 *(u32 *) (p + 2) = htonl(session[s].pout);
 267                                 p += p[1];
 268                         }
 269                         else
 270                         {                // start
 271                                 *p = 41;      // delay
 272                                 p[1] = 6;
 273                                 *(u32 *) (p + 2) = htonl(time(NULL) - session[s].opened);
 274                                 p += p[1];
 275                         }
 276                 }
 277         }
 278         if (s)
 279         {
 280                 *p = 5; // NAS-Port
 281                 p[1] = 6;
 282                 *(u32 *) (p + 2) = htonl(s);
 283                 p += p[1];
 284         }
 285         if (s && session[s].ip)
 286         {
 287                 *p = 8;                 // Framed-IP-Address
 288                 p[1] = 6;
 289                 *(u32 *) (p + 2) = htonl(session[s].ip);
 290                 p += p[1];
 291         }
 292         if (*session[s].called)
 293         {
 294                 *p = 30;                // called
 295                 p[1] = strlen(session[s].called) + 2;
 296                 strcpy(p + 2, session[s].called);
 297                 p += p[1];
 298         }
 299         if (*radius[r].calling)
 300         {
 301                 *p = 31;                // calling
 302                 p[1] = strlen(radius[r].calling) + 2;
 303                 strcpy(p + 2, radius[r].calling);
 304                 p += p[1];
 305         }
 306         else if (*session[s].calling)
 307         {
 308                 *p = 31;                // calling
 309                 p[1] = strlen(session[s].calling) + 2;
 310                 strcpy(p + 2, session[s].calling);
 311                 p += p[1];
 312         }
 313         // NAS-IP-Address
 314         *p = 4;
 315         p[1] = 6;
 316         *(u32 *)(p + 2) = config->bind_address;
 317         p += p[1];
 318
 319         // All AVpairs added
 320         *(u16 *) (b + 2) = htons(p - b);
 321         if (state != RADIUSAUTH)
 322         {
 323             // Build auth for accounting packet
 324             char z[16] = {0};
 325             char hash[16] = {0};
 326             MD5_CTX ctx;
 327             MD5Init(&ctx);
 328             MD5Update(&ctx, b, 4);
 329             MD5Update(&ctx, z, 16);
 330             MD5Update(&ctx, b + 20, (p - b) - 20);
 331             MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
 332             MD5Final(hash, &ctx);
 333             memcpy(b + 4, hash, 16);
 334             memcpy(radius[r].auth, hash, 16);
 335         }
 336         memset(&addr, 0, sizeof(addr));
 337         addr.sin_family = AF_INET;
 338         *(u32 *) & addr.sin_addr = config->radiusserver[(radius[r].try - 1) % config->numradiusservers];
 339         addr.sin_port = htons((state == RADIUSAUTH) ? RADPORT : RADAPORT);
 340
 341         log_hex(5, "RADIUS Send", b, (p - b));
 342         sendto(radfds[r & RADIUS_MASK], b, p - b, 0, (void *) &addr, sizeof(addr));
 343 }
 344
 345 // process RADIUS response
 346 void processrad(u8 *buf, int len, char socket_index)
 347 {
 348         u8 b[MAXCONTROL];
 349         MD5_CTX ctx;
 350         u16 r;
 351         sessionidt s;
 352         tunnelidt t = 0;
 353         hasht hash;
 354         u8 routes = 0;
 355
 356         int r_code, r_id ; // Radius code.
 357
 358         r_code = buf[0]; // First byte in radius packet.
 359         r_id = buf[1]; // radius reply indentifier.
 360
 361
 362         CSTAT(call_processrad);
 363
 364         log_hex(5, "RADIUS Response", buf, len);
 365         if (len < 20 || len < ntohs(*(u16 *) (buf + 2)))
 366         {
 367                 log(1, 0, 0, 0, "Duff RADIUS response length %d\n", len);
 368                 return ;
 369         }
 370         len = ntohs(*(u16 *) (buf + 2));
 371         r = socket_index | (r_id << RADIUS_SHIFT);
 372         s = radius[r].session;
 373         log(3, 0, s, session[s].tunnel, "Received %s, radius %d response for session %u (code %d, id %d)\n",
 374                         radius_states[radius[r].state], r, s, r_code, r_id);
 375         if (!s && radius[r].state != RADIUSSTOP)
 376         {
 377                 log(1, 0, s, session[s].tunnel, "   Unexpected RADIUS response\n");
 378                 return;
 379         }
 380         if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSSTART && radius[r].state != RADIUSSTOP)
 381         {
 382                 log(1, 0, s, session[s].tunnel, "   Unexpected RADIUS response\n");
 383                 return;
 384         }
 385         t = session[s].tunnel;
 386         MD5Init(&ctx);
 387         MD5Update(&ctx, buf, 4);
 388         MD5Update(&ctx, radius[r].auth, 16);
 389         MD5Update(&ctx, buf + 20, len - 20);
 390         MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
 391         MD5Final(hash, &ctx);
 392         do {
 393                 if (memcmp(hash, buf + 4, 16))
 394                 {
 395                         log(0, 0, s, session[s].tunnel, "   Incorrect auth on RADIUS response!! (wrong secret in radius config?)\n");
 396 //                      radius[r].state = RADIUSWAIT;
 397
 398                         return; // Do nothing. On timeout, it will try the next radius server.
 399                 }
 400                 if ((radius[r].state == RADIUSAUTH && *buf != 2 && *buf != 3) ||
 401                         ((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP) && *buf != 5))
 402                 {
 403                         log(1, 0, s, session[s].tunnel, "   Unexpected RADIUS response %d\n", *buf);
 404
 405                         return; // We got something we didn't expect. Let the timeouts take
 406                                 // care off finishing the radius session if that's really correct.
 407 // old code. I think incorrect. --mo
 408 //                      radius[r].state = RADIUSWAIT;
 409 //                      break; // Finish the radius sesssion.
 410                 }
 411                 if (radius[r].state == RADIUSAUTH)
 412                 {
 413                         log(4, 0, s, session[s].tunnel, "   Original response is \"%s\"\n", (*buf == 2) ? "accept" : "reject");
 414                         // process auth response
 415                         if (radius[r].chap)
 416                         {
 417                                 // CHAP
 418                                 u8 *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP);
 419                                 if (!p) {
 420                                         return; // Abort!
 421                                 }
 422                                 {
 423                                         struct param_post_auth packet = { &tunnel[t], &session[s], session[s].user, (*buf == 2), PPPCHAP };
 424                                         run_plugins(PLUGIN_POST_AUTH, &packet);
 425                                         *buf = packet.auth_allowed ? 2 : 3;
 426                                 }
 427
 428                                 log(3, 0, s, session[s].tunnel, "   CHAP User %s authentication %s.\n", session[s].user,
 429                                                 (*buf == 2) ? "allowed" : "denied");
 430                                 *p = (*buf == 2) ? 3 : 4;     // ack/nak
 431                                 p[1] = radius[r].id;
 432                                 *(u16 *) (p + 2) = ntohs(4); // no message
 433                                 tunnelsend(b, (p - b) + 4, t); // send it
 434                         }
 435                         else
 436                         {
 437                                 // PAP
 438                                 u8 *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP);
 439                                 if (!p)
 440                                         return;         // Abort!
 441
 442                                 {
 443                                         struct param_post_auth packet = { &tunnel[t], &session[s], session[s].user, (*buf == 2), PPPPAP };
 444                                         run_plugins(PLUGIN_POST_AUTH, &packet);
 445                                         *buf = packet.auth_allowed ? 2 : 3;
 446                                 }
 447
 448                                 log(3, 0, s, session[s].tunnel, "   PAP User %s authentication %s.\n", session[s].user,
 449                                                 (*buf == 2) ? "allowed" : "denied");
 450                                 // ack/nak
 451                                 *p = *buf;
 452                                 p[1] = radius[r].id;
 453                                 *(u16 *) (p + 2) = ntohs(5);
 454                                 p[4] = 0; // no message
 455                                 tunnelsend(b, (p - b) + 5, t); // send it
 456                         }
 457
 458                         if (*buf == 2)
 459                         {
 460                                 // Login successful
 461                                 // Extract IP, routes, etc
 462                                 u8 *p = buf + 20;
 463                                 u8 *e = buf + len;
 464                                 for (p = buf + 20; p < e && p[1]; p += p[1])
 465                                 {
 466                                         if (*p == 8)
 467                                         {
 468                                                 // Statically assigned address
 469                                                 log(3, 0, s, session[s].tunnel, "   Radius reply contains IP address %s\n", inet_toa(*(u32 *) (p + 2)));
 470                                                 session[s].ip = ntohl(*(u32 *) (p + 2));
 471                                                 session[s].ip_pool_index = -1;
 472                                         }
 473                                         else if (*p == 135)
 474                                         {
 475                                                 // DNS address
 476                                                 log(3, 0, s, session[s].tunnel, "   Radius reply contains primary DNS address %s\n", inet_toa(*(u32 *) (p + 2)));
 477                                                 session[s].dns1 = ntohl(*(u32 *) (p + 2));
 478                                         }
 479                                         else if (*p == 136)
 480                                         {
 481                                                 // DNS address
 482                                                 log(3, 0, s, session[s].tunnel, "   Radius reply contains secondary DNS address %s\n", inet_toa(*(u32 *) (p + 2)));
 483                                                 session[s].dns2 = ntohl(*(u32 *) (p + 2));
 484                                         }
 485                                         else if (*p == 22)
 486                                         {
 487                                                 // framed-route
 488                                                 ipt ip = 0, mask = 0;
 489                                                 u8 u = 0;
 490                                                 u8 bits = 0;
 491                                                 u8 *n = p + 2;
 492                                                 u8 *e = p + p[1];
 493                                                 while (n < e && (isdigit(*n) || *n == '.'))
 494                                                 {
 495                                                         if (*n == '.')
 496                                                         {
 497                                                                 ip = (ip << 8) + u;
 498                                                                 u = 0;
 499                                                         }
 500                                                         else
 501                                                                 u = u * 10 + *n - '0';
 502                                                         n++;
 503                                                 }
 504                                                 ip = (ip << 8) + u;
 505                                                 if (*n == '/')
 506                                                 {
 507                                                         n++;
 508                                                         while (n < e && isdigit(*n))
 509                                                                 bits = bits * 10 + *n++ - '0';
 510                                                         mask = (( -1) << (32 - bits));
 511                                                 }
 512                                                 else if ((ip >> 24) < 128)
 513                                                         mask = 0xFF0000;
 514                                                 else if ((ip >> 24) < 192)
 515                                                         mask = 0xFFFF0000;
 516                                                 else
 517                                                         mask = 0xFFFFFF00;
 518                                                 if (routes == MAXROUTE)
 519                                                 {
 520                                                         log(1, 0, s, session[s].tunnel, "   Too many routes\n");
 521                                                 }
 522                                                 else if (ip)
 523                                                 {
 524                                                         char *ips, *masks;
 525                                                         ips = strdup(inet_toa(htonl(ip)));
 526                                                         masks = strdup(inet_toa(htonl(mask)));
 527                                                         log(3, 0, s, session[s].tunnel, "   Radius reply contains route for %s/%s\n", ips, masks);
 528                                                         free(ips);
 529                                                         free(masks);
 530                                                         session[s].route[routes].ip = ip;
 531                                                         session[s].route[routes].mask = mask;
 532                                                         routes++;
 533                                                 }
 534                                         }
 535                                         else if (*p == 26)
 536                                         {
 537                                                 // Vendor-Specific Attribute
 538                                                 int vendor = ntohl(*(int *)(p + 2));
 539                                                 char attrib = *(p + 6);
 540                                                 char attrib_length = *(p + 7) - 2;
 541                                                 log(3, 0, s, session[s].tunnel, "   Radius reply contains Vendor-Specific. Vendor=%d Attrib=%d Length=%d\n", vendor, attrib, attrib_length);
 542                                                 if (attrib_length == 0) continue;
 543                                                 if (attrib != 1)
 544                                                         log(3, 0, s, session[s].tunnel, "      Unknown vendor-specific\n");
 545                                                 else
 546                                                 {
 547                                                         char *avpair, *value, *key, *newp;
 548                                                         avpair = key = calloc(attrib_length + 1, 1);
 549                                                         memcpy(avpair, p + 8, attrib_length);
 550                                                         log(3, 0, s, session[s].tunnel, "      Cisco-Avpair value: %s\n", avpair);
 551                                                         do {
 552                                                                 value = strchr(key, '=');
 553                                                                 if (!value) break;
 554                                                                 *value++ = 0;
 555
 556                                                                 // Trim quotes off reply string
 557                                                                 if (*value == '\'' || *value == '\"')
 558                                                                 {
 559                                                                         char *x;
 560                                                                         value++;
 561                                                                         x = value + strlen(value) - 1;
 562                                                                         if (*x == '\'' || *x == '\"')
 563                                                                                 *x = 0;
 564                                                                 }
 565
 566                                                                 // Run hooks
 567                                                                 newp = strchr(value, ',');
 568                                                                 if (newp) *newp++ = 0;
 569                                                                 {
 570                                                                         struct param_radius_response p = { &tunnel[session[s].tunnel], &session[s], key, value };
 571                                                                         run_plugins(PLUGIN_RADIUS_RESPONSE, &p);
 572                                                                 }
 573                                                                 key = newp;
 574                                                         } while (newp);
 575                                                         free(avpair);
 576                                                 }
 577                                         }
 578                                 }
 579                         }
 580                         else if (*buf == 3)
 581                         {
 582                                 log(2, 0, s, session[s].tunnel, "   Authentication denied for %s\n", session[s].user);
 583 //FIXME: We should tear down the session here!
 584                                 break;
 585                         }
 586
 587                         if (!session[s].dns1 && config->default_dns1)
 588                         {
 589                                 session[s].dns1 = htonl(config->default_dns1);
 590                                 log(3, 0, s, t, "   Sending dns1 = %s\n", inet_toa(config->default_dns1));
 591                         }
 592                         if (!session[s].dns2 && config->default_dns2)
 593                         {
 594                                 session[s].dns2 = htonl(config->default_dns2);
 595                                 log(3, 0, s, t, "   Sending dns2 = %s\n", inet_toa(config->default_dns2));
 596                         }
 597
 598                         // Valid Session, set it up
 599                         session[s].sid = 0;
 600                         sessionsetup(t, s);
 601                 }
 602                 else
 603                 {
 604                                 // An ack for a stop or start record.
 605                         log(3, 0, s, t, "   RADIUS accounting ack recv in state %s\n", radius_states[radius[r].state]);
 606                         break;
 607                 }
 608         } while (0);
 609
 610         // finished with RADIUS
 611         radiusclear(r, s);
 612 }
 613
 614 // Send a retry for RADIUS/CHAP message
 615 void radiusretry(u16 r)
 616 {
 617         sessionidt s = radius[r].session;
 618         tunnelidt t = 0;
 619
 620         CSTAT(call_radiusretry);
 621
 622         if (s)
 623                 t = session[s].tunnel;
 624         radius[r].retry = backoff(radius[r].try + 1);
 625         switch (radius[r].state)
 626         {
 627                 case RADIUSCHAP:           // sending CHAP down PPP
 628                         sendchap(t, s);
 629                         break;
 630                 case RADIUSIPCP:
 631                         sendipcp(t, s);         // send IPCP
 632                         break;
 633                 case RADIUSAUTH:           // sending auth to RADIUS server
 634                         radiussend(r, RADIUSAUTH);
 635                         break;
 636                 case RADIUSSTART:          // sending start accounting to RADIUS server
 637                         radiussend(r, RADIUSSTART);
 638                         break;
 639                 case RADIUSSTOP:           // sending stop accounting to RADIUS server
 640                         radiussend(r, RADIUSSTOP);
 641                         break;
 642                 default:
 643                 case RADIUSNULL:           // Not in use
 644                 case RADIUSWAIT:           // waiting timeout before available, in case delayed reply from RADIUS server
 645                         // free up RADIUS task
 646                         radiusclear(r, s);
 647                         log(3, 0, s, session[s].tunnel, "Freeing up radius session %d\n", r);
 648                         break;
 649         }
 650 }
 651
 652 void radius_clean()
 653 {
 654         int i;
 655
 656         log(1, 0, 0, 0, "Cleaning radius session array\n");
 657
 658         for (i = 1; i < MAXRADIUS; i++)
 659         {
 660                 if (radius[i].retry == 0
 661                                 || !session[radius[i].session].opened
 662                                 || session[radius[i].session].die
 663                                 || session[radius[i].session].tunnel == 0)
 664                         radiusclear(i, 0);
 665         }
 666 }