src/libimcv/imc/imc_agent.c

   1 /*
   2  * Copyright (C) 2011 Andreas Steffen, HSR Hochschule fuer Technik Rapperswil
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  */
  14
  15 #include "imcv.h"
  16 #include "imc_agent.h"
  17
  18 #include <tncif_names.h>
  19
  20 #include <debug.h>
  21 #include <threading/rwlock.h>
  22
  23 typedef struct private_imc_agent_t private_imc_agent_t;
  24
  25 /**
  26  * Private data of an imc_agent_t object.
  27  */
  28 struct private_imc_agent_t {
  29
  30         /**
  31          * Public members of imc_agent_t
  32          */
  33         imc_agent_t public;
  34
  35         /**
  36          * name of IMC
  37          */
  38         const char *name;
  39
  40         /**
  41          * message vendor ID of IMC
  42          */
  43         TNC_VendorID vendor_id;
  44
  45         /**
  46          * message subtype of IMC
  47          */
  48         TNC_MessageSubtype subtype;
  49
  50         /**
  51          * ID of IMC as assigned by TNCC
  52          */
  53         TNC_IMCID id;
  54
  55         /**
  56          * List of additional IMC IDs assigned by TNCC
  57          */
  58         linked_list_t *additional_ids;
  59
  60         /**
  61          * list of TNCC connection entries
  62          */
  63         linked_list_t *connections;
  64
  65         /**
  66          * rwlock to lock TNCC connection entries
  67          */
  68         rwlock_t *connection_lock;
  69
  70         /**
  71          * Inform a TNCC about the set of message types the IMC is able to receive
  72          *
  73          * @param imc_id                        IMC ID assigned by TNCC
  74          * @param supported_types       list of supported message types
  75          * @param type_count            number of list elements
  76          * @return                                      TNC result code
  77          */
  78         TNC_Result (*report_message_types)(TNC_IMCID imc_id,
  79                                                                            TNC_MessageTypeList supported_types,
  80                                                                            TNC_UInt32 type_count);
  81
  82         /**
  83          * Inform a TNCC about the set of message types the IMC is able to receive
  84          *
  85          * @param imc_id                                IMC ID assigned by TNCC
  86          * @param supported_vids                list of supported message vendor IDs
  87          * @param supported_subtypes    list of supported message subtypes
  88          * @param type_count                    number of list elements
  89          * @return                                              TNC result code
  90          */
  91         TNC_Result (*report_message_types_long)(TNC_IMCID imc_id,
  92                                                                         TNC_VendorIDList supported_vids,
  93                                                                         TNC_MessageSubtypeList supported_subtypes,
  94                                                                         TNC_UInt32 type_count);
  95
  96         /**
  97          * Call when an IMC-IMC message is to be sent
  98          *
  99          * @param imc_id                        IMC ID assigned by TNCC
 100          * @param connection_id         network connection ID assigned by TNCC
 101          * @param msg                           message to send
 102          * @param msg_len                       message length in bytes
 103          * @param msg_type                      message type
 104          * @return                                      TNC result code
 105          */
 106         TNC_Result (*send_message)(TNC_IMCID imc_id,
 107                                                            TNC_ConnectionID connection_id,
 108                                                            TNC_BufferReference msg,
 109                                                            TNC_UInt32 msg_len,
 110                                                            TNC_MessageType msg_type);
 111
 112
 113         /**
 114          * Call when an IMC-IMC message is to be sent with long message types
 115          *
 116          * @param imc_id                        IMC ID assigned by TNCC
 117          * @param connection_id         network connection ID assigned by TNCC
 118          * @param msg_flags                     message flags
 119          * @param msg                           message to send
 120          * @param msg_len                       message length in bytes
 121          * @param msg_vid                       message vendor ID
 122          * @param msg_subtype           message subtype
 123          * @param dst_imc_id            destination IMV ID
 124          * @return                                      TNC result code
 125          */
 126         TNC_Result (*send_message_long)(TNC_IMCID imc_id,
 127                                                                         TNC_ConnectionID connection_id,
 128                                                                         TNC_UInt32 msg_flags,
 129                                                                         TNC_BufferReference msg,
 130                                                                         TNC_UInt32 msg_len,
 131                                                                         TNC_VendorID msg_vid,
 132                                                                         TNC_MessageSubtype msg_subtype,
 133                                                                         TNC_UInt32 dst_imv_id);
 134
 135         /**
 136          * Get the value of an attribute associated with a connection
 137          * or with the TNCC as a whole.
 138          *
 139          * @param imc_id                        IMC ID assigned by TNCC
 140          * @param connection_id         network connection ID assigned by TNCC
 141          * @param attribute_id          attribute ID
 142          * @param buffer_len            length of buffer in bytes
 143          * @param buffer                        buffer
 144          * @param out_value_len         size in bytes of attribute stored in buffer
 145          * @return                                      TNC result code
 146          */
 147         TNC_Result (*get_attribute)(TNC_IMCID imc_id,
 148                                                                 TNC_ConnectionID connection_id,
 149                                                                 TNC_AttributeID attribute_id,
 150                                                                 TNC_UInt32 buffer_len,
 151                                                                 TNC_BufferReference buffer,
 152                                                                 TNC_UInt32 *out_value_len);
 153
 154         /**
 155          * Set the value of an attribute associated with a connection
 156          * or with the TNCC as a whole.
 157          *
 158          * @param imc_id                        IMV ID assigned by TNCC
 159          * @param connection_id         network connection ID assigned by TNCC
 160          * @param attribute_id          attribute ID
 161          * @param buffer_len            length of buffer in bytes
 162          * @param buffer                        buffer
 163          * @return                                      TNC result code
 164          */
 165         TNC_Result (*set_attribute)(TNC_IMCID imc_id,
 166                                                                 TNC_ConnectionID connection_id,
 167                                                                 TNC_AttributeID attribute_id,
 168                                                                 TNC_UInt32 buffer_len,
 169                                                                 TNC_BufferReference buffer);
 170
 171         /**
 172          * Reserve an additional IMC ID
 173          *
 174          * @param imc_id                        primary IMC ID assigned by TNCC
 175          * @param out_imc_id            additional IMC ID assigned by TNCC
 176          * @return                                      TNC result code
 177          */
 178         TNC_Result (*reserve_additional_id)(TNC_IMCID imc_id,
 179                                                                                 TNC_UInt32 *out_imc_id);
 180
 181 };
 182
 183 METHOD(imc_agent_t, bind_functions, TNC_Result,
 184         private_imc_agent_t *this, TNC_TNCC_BindFunctionPointer bind_function)
 185 {
 186         if (!bind_function)
 187         {
 188                 DBG1(DBG_IMC, "TNC client failed to provide bind function");
 189                 return TNC_RESULT_INVALID_PARAMETER;
 190         }
 191         if (bind_function(this->id, "TNC_TNCC_ReportMessageTypes",
 192                         (void**)&this->report_message_types) != TNC_RESULT_SUCCESS)
 193         {
 194                 this->report_message_types = NULL;
 195         }
 196         if (bind_function(this->id, "TNC_TNCC_ReportMessageTypesLong",
 197                         (void**)&this->report_message_types_long) != TNC_RESULT_SUCCESS)
 198         {
 199                 this->report_message_types_long = NULL;
 200         }
 201         if (bind_function(this->id, "TNC_TNCC_RequestHandshakeRetry",
 202                         (void**)&this->public.request_handshake_retry) != TNC_RESULT_SUCCESS)
 203         {
 204                 this->public.request_handshake_retry = NULL;
 205         }
 206         if (bind_function(this->id, "TNC_TNCC_SendMessage",
 207                         (void**)&this->send_message) != TNC_RESULT_SUCCESS)
 208         {
 209                 this->send_message = NULL;
 210         }
 211         if (bind_function(this->id, "TNC_TNCC_SendMessageLong",
 212                         (void**)&this->send_message_long) != TNC_RESULT_SUCCESS)
 213         {
 214                 this->send_message_long = NULL;
 215         }
 216         if (bind_function(this->id, "TNC_TNCC_GetAttribute",
 217                         (void**)&this->get_attribute) != TNC_RESULT_SUCCESS)
 218         {
 219                 this->get_attribute = NULL;
 220         }
 221         if (bind_function(this->id, "TNC_TNCC_SetAttribute",
 222                         (void**)&this->set_attribute) != TNC_RESULT_SUCCESS)
 223         {
 224                 this->set_attribute = NULL;
 225         }
 226         if (bind_function(this->id, "TNC_TNCC_ReserveAdditionalIMCID",
 227                         (void**)&this->reserve_additional_id) != TNC_RESULT_SUCCESS)
 228         {
 229                 this->reserve_additional_id = NULL;
 230         }
 231         DBG2(DBG_IMC, "IMC %u \"%s\" provided with bind function",
 232                                   this->id, this->name);
 233
 234         if (this->report_message_types_long)
 235         {
 236                 this->report_message_types_long(this->id, &this->vendor_id,
 237                                                                                 &this->subtype, 1);
 238         }
 239         else if (this->report_message_types &&
 240                          this->vendor_id <= TNC_VENDORID_ANY &&
 241                          this->subtype <= TNC_SUBTYPE_ANY)
 242         {
 243                 TNC_MessageType type;
 244
 245                 type = (this->vendor_id << 8) | this->subtype;
 246                 this->report_message_types(this->id, &type, 1);
 247         }
 248         return TNC_RESULT_SUCCESS;
 249 }
 250
 251 /**
 252  * finds a connection state based on its Connection ID
 253  */
 254 static imc_state_t* find_connection(private_imc_agent_t *this,
 255                                                                          TNC_ConnectionID id)
 256 {
 257         enumerator_t *enumerator;
 258         imc_state_t *state, *found = NULL;
 259
 260         this->connection_lock->read_lock(this->connection_lock);
 261         enumerator = this->connections->create_enumerator(this->connections);
 262         while (enumerator->enumerate(enumerator, &state))
 263         {
 264                 if (id == state->get_connection_id(state))
 265                 {
 266                         found = state;
 267                         break;
 268                 }
 269         }
 270         enumerator->destroy(enumerator);
 271         this->connection_lock->unlock(this->connection_lock);
 272
 273         return found;
 274 }
 275
 276 /**
 277  * delete a connection state with a given Connection ID
 278  */
 279 static bool delete_connection(private_imc_agent_t *this, TNC_ConnectionID id)
 280 {
 281         enumerator_t *enumerator;
 282         imc_state_t *state;
 283         bool found = FALSE;
 284
 285         this->connection_lock->write_lock(this->connection_lock);
 286         enumerator = this->connections->create_enumerator(this->connections);
 287         while (enumerator->enumerate(enumerator, &state))
 288         {
 289                 if (id == state->get_connection_id(state))
 290                 {
 291                         found = TRUE;
 292                         state->destroy(state);
 293                         this->connections->remove_at(this->connections, enumerator);
 294                         break;
 295                 }
 296         }
 297         enumerator->destroy(enumerator);
 298         this->connection_lock->unlock(this->connection_lock);
 299
 300         return found;
 301 }
 302
 303 /**
 304  * Read a boolean attribute
 305  */
 306 static bool get_bool_attribute(private_imc_agent_t *this, TNC_ConnectionID id,
 307                                                            TNC_AttributeID attribute_id)
 308 {
 309         TNC_UInt32 len;
 310         char buf[4];
 311
 312         return this->get_attribute  &&
 313                    this->get_attribute(this->id, id, attribute_id, 4, buf, &len) ==
 314                                                            TNC_RESULT_SUCCESS && len == 1 && *buf == 0x01;
 315 }
 316
 317 /**
 318  * Read a string attribute
 319  */
 320 static char* get_str_attribute(private_imc_agent_t *this, TNC_ConnectionID id,
 321                                                                 TNC_AttributeID attribute_id)
 322 {
 323         TNC_UInt32 len;
 324         char buf[BUF_LEN];
 325
 326         if (this->get_attribute  &&
 327                 this->get_attribute(this->id, id, attribute_id, BUF_LEN, buf, &len) ==
 328                                                         TNC_RESULT_SUCCESS && len <= BUF_LEN)
 329         {
 330                 return strdup(buf);
 331         }
 332         return NULL;
 333  }
 334
 335 /**
 336  * Read an UInt32 attribute
 337  */
 338 static u_int32_t get_uint_attribute(private_imc_agent_t *this, TNC_ConnectionID id,
 339                                                                         TNC_AttributeID attribute_id)
 340 {
 341         TNC_UInt32 len;
 342         char buf[4];
 343
 344         if (this->get_attribute  &&
 345                 this->get_attribute(this->id, id, attribute_id, 4, buf, &len) ==
 346                                                         TNC_RESULT_SUCCESS && len == 4)
 347         {
 348                 return untoh32(buf);
 349         }
 350         return 0;
 351  }
 352
 353 METHOD(imc_agent_t, create_state, TNC_Result,
 354         private_imc_agent_t *this, imc_state_t *state)
 355 {
 356         TNC_ConnectionID conn_id;
 357         char *tnccs_p = NULL, *tnccs_v = NULL, *t_p = NULL, *t_v = NULL;
 358         bool has_long = FALSE, has_excl = FALSE, has_soh = FALSE;
 359         u_int32_t max_msg_len;
 360
 361         conn_id = state->get_connection_id(state);
 362         if (find_connection(this, conn_id))
 363         {
 364                 DBG1(DBG_IMC, "IMC %u \"%s\" already created a state for Connection ID %u",
 365                                            this->id, this->name, conn_id);
 366                 state->destroy(state);
 367                 return TNC_RESULT_OTHER;
 368         }
 369
 370         /* Get and display attributes from TNCC via IF-IMC */
 371         has_long = get_bool_attribute(this, conn_id, TNC_ATTRIBUTEID_HAS_LONG_TYPES);
 372         has_excl = get_bool_attribute(this, conn_id, TNC_ATTRIBUTEID_HAS_EXCLUSIVE);
 373         has_soh  = get_bool_attribute(this, conn_id, TNC_ATTRIBUTEID_HAS_SOH);
 374         tnccs_p = get_str_attribute(this, conn_id, TNC_ATTRIBUTEID_IFTNCCS_PROTOCOL);
 375         tnccs_v = get_str_attribute(this, conn_id, TNC_ATTRIBUTEID_IFTNCCS_VERSION);
 376         t_p = get_str_attribute(this, conn_id, TNC_ATTRIBUTEID_IFT_PROTOCOL);
 377         t_v = get_str_attribute(this, conn_id, TNC_ATTRIBUTEID_IFT_VERSION);
 378         max_msg_len = get_uint_attribute(this, conn_id, TNC_ATTRIBUTEID_MAX_MESSAGE_SIZE);
 379
 380         state->set_flags(state, has_long, has_excl);
 381         state->set_max_msg_len(state, max_msg_len);
 382
 383         DBG2(DBG_IMC, "IMC %u \"%s\" created a state for %s %s Connection ID %u: "
 384                                   "%slong %sexcl %ssoh", this->id, this->name,
 385                                   tnccs_p ? tnccs_p:"?", tnccs_v ? tnccs_v:"?", conn_id,
 386                               has_long ? "+":"-", has_excl ? "+":"-", has_soh ? "+":"-");
 387         DBG2(DBG_IMC, "  over %s %s with maximum PA-TNC msg size of %u bytes",
 388                                   t_p ? t_p:"?", t_v ? t_v :"?", max_msg_len);
 389
 390         free(tnccs_p);
 391         free(tnccs_v);
 392         free(t_p);
 393         free(t_v);
 394
 395         this->connection_lock->write_lock(this->connection_lock);
 396         this->connections->insert_last(this->connections, state);
 397         this->connection_lock->unlock(this->connection_lock);
 398         return TNC_RESULT_SUCCESS;
 399 }
 400
 401 METHOD(imc_agent_t, delete_state, TNC_Result,
 402         private_imc_agent_t *this, TNC_ConnectionID connection_id)
 403 {
 404         if (!delete_connection(this, connection_id))
 405         {
 406                 DBG1(DBG_IMC, "IMC %u \"%s\" has no state for Connection ID %u",
 407                                           this->id, this->name, connection_id);
 408                 return TNC_RESULT_FATAL;
 409         }
 410         DBG2(DBG_IMC, "IMC %u \"%s\" deleted the state of Connection ID %u",
 411                                   this->id, this->name, connection_id);
 412         return TNC_RESULT_SUCCESS;
 413 }
 414
 415 METHOD(imc_agent_t, change_state, TNC_Result,
 416         private_imc_agent_t *this, TNC_ConnectionID connection_id,
 417                                                            TNC_ConnectionState new_state,
 418                                                            imc_state_t **state_p)
 419 {
 420         imc_state_t *state;
 421
 422         switch (new_state)
 423         {
 424                 case TNC_CONNECTION_STATE_HANDSHAKE:
 425                 case TNC_CONNECTION_STATE_ACCESS_ALLOWED:
 426                 case TNC_CONNECTION_STATE_ACCESS_ISOLATED:
 427                 case TNC_CONNECTION_STATE_ACCESS_NONE:
 428                         state = find_connection(this, connection_id);
 429
 430                         if (!state)
 431                         {
 432                                 DBG1(DBG_IMC, "IMC %u \"%s\" has no state for Connection ID %u",
 433                                                           this->id, this->name, connection_id);
 434                                 return TNC_RESULT_FATAL;
 435                         }
 436                         state->change_state(state, new_state);
 437                         DBG2(DBG_IMC, "IMC %u \"%s\" changed state of Connection ID %u to '%N'",
 438                                                   this->id, this->name, connection_id,
 439                                                   TNC_Connection_State_names, new_state);
 440                         if (state_p)
 441                         {
 442                                 *state_p = state;
 443                         }
 444                         break;
 445                 case TNC_CONNECTION_STATE_CREATE:
 446                         DBG1(DBG_IMC, "state '%N' should be handled by create_state()",
 447                                                   TNC_Connection_State_names, new_state);
 448                                 return TNC_RESULT_FATAL;
 449                 case TNC_CONNECTION_STATE_DELETE:
 450                         DBG1(DBG_IMC, "state '%N' should be handled by delete_state()",
 451                                                   TNC_Connection_State_names, new_state);
 452                                 return TNC_RESULT_FATAL;
 453                 default:
 454                         DBG1(DBG_IMC, "IMC %u \"%s\" was notified of unknown state %u "
 455                                                   "for Connection ID %u",
 456                                                   this->id, this->name, new_state, connection_id);
 457                         return TNC_RESULT_INVALID_PARAMETER;
 458         }
 459         return TNC_RESULT_SUCCESS;
 460 }
 461
 462 METHOD(imc_agent_t, get_state, bool,
 463         private_imc_agent_t *this, TNC_ConnectionID connection_id,
 464                                                            imc_state_t **state)
 465 {
 466         *state = find_connection(this, connection_id);
 467         if (!*state)
 468         {
 469                 DBG1(DBG_IMC, "IMC %u \"%s\" has no state for Connection ID %u",
 470                                           this->id, this->name, connection_id);
 471                 return FALSE;
 472         }
 473         return TRUE;
 474 }
 475
 476 METHOD(imc_agent_t, send_message, TNC_Result,
 477         private_imc_agent_t *this, TNC_ConnectionID connection_id, bool excl,
 478         TNC_UInt32 src_imc_id, TNC_UInt32 dst_imv_id, linked_list_t *attr_list)
 479 {
 480         TNC_MessageType type;
 481         TNC_UInt32 msg_flags;
 482         TNC_Result result = TNC_RESULT_FATAL;
 483         imc_state_t *state;
 484         pa_tnc_attr_t *attr;
 485         pa_tnc_msg_t *pa_tnc_msg;
 486         chunk_t msg;
 487         enumerator_t *enumerator;
 488
 489         state = find_connection(this, connection_id);
 490         if (!state)
 491         {
 492                 DBG1(DBG_IMV, "IMC %u \"%s\" has no state for Connection ID %u",
 493                                           this->id, this->name, connection_id);
 494                 return TNC_RESULT_FATAL;
 495         }
 496
 497         while (attr_list->get_count(attr_list))
 498         {
 499                 pa_tnc_msg = pa_tnc_msg_create(state->get_max_msg_len(state));
 500
 501                 enumerator = attr_list->create_enumerator(attr_list);
 502                 while (enumerator->enumerate(enumerator, &attr))
 503                 {
 504                         if (!pa_tnc_msg->add_attribute(pa_tnc_msg, attr))
 505                         {
 506                                 break;
 507                         }
 508                         attr_list->remove_at(attr_list, enumerator);
 509                 }
 510                 enumerator->destroy(enumerator);
 511
 512                 /* build and send the PA-TNC message via the IF-IMC interface */
 513                 pa_tnc_msg->build(pa_tnc_msg);
 514                 msg = pa_tnc_msg->get_encoding(pa_tnc_msg);
 515
 516                 if (state->has_long(state) && this->send_message_long)
 517                 {
 518                         if (!src_imc_id)
 519                         {
 520                                 src_imc_id = this->id;
 521                         }
 522                         msg_flags = excl ? TNC_MESSAGE_FLAGS_EXCLUSIVE : 0;
 523
 524                         result = this->send_message_long(src_imc_id, connection_id,
 525                                                                 msg_flags, msg.ptr, msg.len, this->vendor_id,
 526                                                                 this->subtype, dst_imv_id);
 527                 }
 528                 else if (this->send_message)
 529                 {
 530                         type = (this->vendor_id << 8) | this->subtype;
 531
 532                         result = this->send_message(this->id, connection_id, msg.ptr,
 533                                                                 msg.len, type);
 534                 }
 535
 536                 pa_tnc_msg->destroy(pa_tnc_msg);
 537
 538                 if (result != TNC_RESULT_SUCCESS)
 539                 {
 540                         break;
 541                 }
 542         }
 543         return result;
 544 }
 545
 546 METHOD(imc_agent_t, receive_message, TNC_Result,
 547         private_imc_agent_t *this, imc_state_t *state, chunk_t msg,
 548         TNC_VendorID msg_vid, TNC_MessageSubtype msg_subtype,
 549         TNC_UInt32 src_imv_id, TNC_UInt32 dst_imc_id, pa_tnc_msg_t **pa_tnc_msg)
 550 {
 551         pa_tnc_msg_t *pa_msg;
 552         pa_tnc_attr_t *error_attr;
 553         linked_list_t *error_attr_list;
 554         enumerator_t *enumerator;
 555         TNC_UInt32 src_imc_id, dst_imv_id;
 556         TNC_ConnectionID connection_id;
 557         TNC_Result result;
 558
 559         connection_id = state->get_connection_id(state);
 560
 561         if (state->has_long(state))
 562         {
 563                 if (dst_imc_id != TNC_IMCID_ANY)
 564                 {
 565                         DBG2(DBG_IMC, "IMC %u \"%s\" received message for Connection ID %u "
 566                                                   "from IMV %u to IMC %u", this->id, this->name,
 567                                                    connection_id, src_imv_id, dst_imc_id);
 568                 }
 569                 else
 570                 {
 571                         DBG2(DBG_IMC, "IMC %u \"%s\" received message for Connection ID %u "
 572                                                   "from IMV %u", this->id, this->name, connection_id,
 573                                                    src_imv_id);
 574                 }
 575         }
 576         else
 577         {
 578                 DBG2(DBG_IMC, "IMC %u \"%s\" received message for Connection ID %u",
 579                                            this->id, this->name, connection_id);
 580         }
 581
 582         *pa_tnc_msg = NULL;
 583         pa_msg = pa_tnc_msg_create_from_data(msg);
 584
 585         switch (pa_msg->process(pa_msg))
 586         {
 587                 case SUCCESS:
 588                         *pa_tnc_msg = pa_msg;
 589                         break;
 590                 case VERIFY_ERROR:
 591                         /* extract and copy by refence all error attributes */
 592                         error_attr_list = linked_list_create();
 593
 594                         enumerator = pa_msg->create_error_enumerator(pa_msg);
 595                         while (enumerator->enumerate(enumerator, &error_attr))
 596                         {
 597                                 error_attr_list->insert_last(error_attr_list,
 598                                                                                          error_attr->get_ref(error_attr));
 599                         }
 600                         enumerator->destroy(enumerator);
 601
 602                         src_imc_id = (dst_imc_id == TNC_IMCID_ANY) ? this->id : dst_imc_id;
 603                         dst_imv_id = state->has_excl(state) ? src_imv_id : TNC_IMVID_ANY;
 604
 605                         result = send_message(this, connection_id, state->has_excl(state),
 606                                                                   src_imc_id, dst_imv_id, error_attr_list);
 607
 608                         error_attr_list->destroy(error_attr_list);
 609                         pa_msg->destroy(pa_msg);
 610                         return result;
 611                 case FAILED:
 612                 default:
 613                         pa_msg->destroy(pa_msg);
 614                         return TNC_RESULT_FATAL;
 615         }
 616         return TNC_RESULT_SUCCESS;
 617 }
 618
 619 METHOD(imc_agent_t, reserve_additional_ids, TNC_Result,
 620         private_imc_agent_t *this, int count)
 621 {
 622         TNC_Result result;
 623         TNC_UInt32 id;
 624         void *pointer;
 625
 626         if (!this->reserve_additional_id)
 627         {
 628                 DBG1(DBG_IMC, "IMC %u \"%s\" did not detect the capability to reserve "
 629                                           "additional IMC IDs from the TNCC", this->id, this->name);
 630                 return TNC_RESULT_ILLEGAL_OPERATION;
 631         }
 632         while (count > 0)
 633         {
 634                 result = this->reserve_additional_id(this->id, &id);
 635                 if (result != TNC_RESULT_SUCCESS)
 636                 {
 637                         DBG1(DBG_IMC, "IMC %u \"%s\" failed to reserve %d additional IMC IDs",
 638                                                   this->id, this->name, count);
 639                         return result;
 640                 }
 641                 count--;
 642
 643                 /* store the scalar value in the pointer */
 644                 pointer = (void*)id;
 645                 this->additional_ids->insert_last(this->additional_ids, pointer);
 646                 DBG2(DBG_IMC, "IMC %u \"%s\" reserved additional ID %u",
 647                                           this->id, this->name, id);
 648         }
 649         return TNC_RESULT_SUCCESS;
 650 }
 651
 652 METHOD(imc_agent_t, count_additional_ids, int,
 653         private_imc_agent_t *this)
 654 {
 655         return  this->additional_ids->get_count(this->additional_ids);
 656 }
 657
 658 METHOD(imc_agent_t, create_id_enumerator, enumerator_t*,
 659         private_imc_agent_t *this)
 660 {
 661         return this->additional_ids->create_enumerator(this->additional_ids);
 662 }
 663
 664 METHOD(imc_agent_t, destroy, void,
 665         private_imc_agent_t *this)
 666 {
 667         DBG1(DBG_IMC, "IMC %u \"%s\" terminated", this->id, this->name);
 668         this->additional_ids->destroy(this->additional_ids);
 669         this->connections->destroy_function(this->connections, free);
 670         this->connection_lock->destroy(this->connection_lock);
 671         free(this);
 672
 673         /* decrease the reference count or terminate */
 674         libimcv_deinit();
 675 }
 676
 677 /**
 678  * Described in header.
 679  */
 680 imc_agent_t *imc_agent_create(const char *name,
 681                                                           pen_t vendor_id, u_int32_t subtype,
 682                                                           TNC_IMCID id, TNC_Version *actual_version)
 683 {
 684         private_imc_agent_t *this;
 685
 686         /* initialize  or increase the reference count */
 687         if (!libimcv_init())
 688         {
 689                 return NULL;
 690         }
 691
 692         INIT(this,
 693                 .public = {
 694                         .bind_functions = _bind_functions,
 695                         .create_state = _create_state,
 696                         .delete_state = _delete_state,
 697                         .change_state = _change_state,
 698                         .get_state = _get_state,
 699                         .send_message = _send_message,
 700                         .receive_message = _receive_message,
 701                         .reserve_additional_ids = _reserve_additional_ids,
 702                         .count_additional_ids = _count_additional_ids,
 703                         .create_id_enumerator = _create_id_enumerator,
 704                         .destroy = _destroy,
 705                 },
 706                 .name = name,
 707                 .vendor_id = vendor_id,
 708                 .subtype = subtype,
 709                 .id = id,
 710                 .additional_ids = linked_list_create(),
 711                 .connections = linked_list_create(),
 712                 .connection_lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
 713         );
 714
 715         *actual_version = TNC_IFIMC_VERSION_1;
 716         DBG1(DBG_IMC, "IMC %u \"%s\" initialized", this->id, this->name);
 717
 718         return &this->public;
 719 }
 720