596 lines
16 KiB
C
596 lines
16 KiB
C
/*
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* Copyright (C) 2017 Andreas Steffen
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* HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "imc_swima_state.h"
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#include <imc/imc_agent.h>
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#include <imc/imc_msg.h>
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#include "ietf/swima/ietf_swima_attr_req.h"
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#include "ietf/swima/ietf_swima_attr_sw_inv.h"
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#include "ietf/swima/ietf_swima_attr_sw_ev.h"
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#include "swima/swima_inventory.h"
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#include "swima/swima_collector.h"
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#include "swima/swima_error.h"
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#include "tcg/seg/tcg_seg_attr_max_size.h"
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#include "tcg/seg/tcg_seg_attr_seg_env.h"
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#include <tncif_pa_subtypes.h>
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#include <pen/pen.h>
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#include <utils/debug.h>
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#include <errno.h>
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#include <poll.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/inotify.h>
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#include <unistd.h>
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#ifndef SW_COLLECTOR
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#define SW_COLLECTOR NULL
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#endif
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/* IMC definitions */
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static const char imc_name[] = "SWIMA";
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static pen_type_t msg_types[] = {
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{ PEN_IETF, PA_SUBTYPE_IETF_SWIMA }
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};
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static imc_agent_t *imc_swima;
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/**
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* see section 3.8.1 of TCG TNC IF-IMC Specification 1.3
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*/
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TNC_Result TNC_IMC_Initialize(TNC_IMCID imc_id,
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TNC_Version min_version,
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TNC_Version max_version,
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TNC_Version *actual_version)
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{
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if (imc_swima)
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{
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DBG1(DBG_IMC, "IMC \"%s\" has already been initialized", imc_name);
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return TNC_RESULT_ALREADY_INITIALIZED;
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}
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imc_swima = imc_agent_create(imc_name, msg_types, countof(msg_types),
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imc_id, actual_version);
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if (!imc_swima)
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{
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return TNC_RESULT_FATAL;
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}
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if (min_version > TNC_IFIMC_VERSION_1 || max_version < TNC_IFIMC_VERSION_1)
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{
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DBG1(DBG_IMC, "no common IF-IMC version");
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return TNC_RESULT_NO_COMMON_VERSION;
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}
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return TNC_RESULT_SUCCESS;
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}
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/**
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* Poll for IN_CLOSE_WRITE event on the apt history.log
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*/
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static bool poll_history_log(void)
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{
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int fd, wd, res;
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nfds_t nfds;
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struct pollfd fds[1];
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char *history_path;
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bool success = FALSE;
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history_path = lib->settings->get_str(lib->settings, "sw-collector.history",
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NULL);
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if (!history_path)
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{
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DBG1(DBG_IMC, "sw-collector.history path not set");
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return FALSE;
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}
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/* Create the file descriptor for accessing the inotify API */
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fd = inotify_init1(IN_NONBLOCK);
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if (fd == -1)
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{
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DBG1(DBG_IMC, "inotify file descriptor could not be created");
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return FALSE;
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}
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/* Watch for CLOSE_WRITE events on history log */
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wd = inotify_add_watch(fd, history_path, IN_CLOSE_WRITE);
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if (wd == -1)
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{
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DBG1(DBG_IMC, "cannot watch '%s'", history_path);
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goto end;
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}
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/* Prepare for polling */
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nfds = 1;
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/* Inotify input */
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fds[0].fd = fd;
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fds[0].events = POLLIN;
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while (1)
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{
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DBG1(DBG_IMC, " waiting for write event on history.log ...");
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res = poll(fds, nfds, -1);
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if (res == -1)
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{
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DBG1(DBG_IMC, " poll failed: %s", strerror(errno));
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if (errno == EINTR)
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{
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continue;
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}
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goto end;
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}
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if (res > 0 && fds[0].revents & POLLIN)
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{
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DBG1(DBG_IMC, " poll successful");
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success = TRUE;
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break;
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}
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}
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end:
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close(fd);
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return success;
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}
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/**
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* see section 3.8.2 of TCG TNC IF-IMC Specification 1.3
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*/
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TNC_Result TNC_IMC_NotifyConnectionChange(TNC_IMCID imc_id,
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TNC_ConnectionID connection_id,
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TNC_ConnectionState new_state)
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{
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imc_state_t *state;
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imc_swima_state_t *swima_state;
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imc_swima_subscription_t *subscription;
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TNC_IMV_Evaluation_Result res;
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TNC_Result result;
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uint32_t eid, eid_epoch;
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if (!imc_swima)
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{
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DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
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return TNC_RESULT_NOT_INITIALIZED;
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}
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switch (new_state)
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{
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case TNC_CONNECTION_STATE_CREATE:
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state = imc_swima_state_create(connection_id);
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return imc_swima->create_state(imc_swima, state);
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case TNC_CONNECTION_STATE_HANDSHAKE:
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if (imc_swima->change_state(imc_swima, connection_id, new_state,
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&state) != TNC_RESULT_SUCCESS)
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{
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return TNC_RESULT_FATAL;
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}
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state->set_result(state, imc_id,
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TNC_IMV_EVALUATION_RESULT_DONT_KNOW);
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return TNC_RESULT_SUCCESS;
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case TNC_CONNECTION_STATE_ACCESS_ALLOWED:
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case TNC_CONNECTION_STATE_ACCESS_ISOLATED:
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case TNC_CONNECTION_STATE_ACCESS_NONE:
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/* get updated IMC state */
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result = imc_swima->change_state(imc_swima, connection_id,
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new_state, &state);
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if (result != TNC_RESULT_SUCCESS)
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{
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return TNC_RESULT_FATAL;
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}
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swima_state = (imc_swima_state_t*)state;
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/* do a handshake retry? */
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if (swima_state->get_subscription(swima_state, &subscription))
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{
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/* update earliest EID in subscription target */
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if (state->get_result(state, imc_id, &res) &&
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res == TNC_IMV_EVALUATION_RESULT_COMPLIANT)
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{
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eid = subscription->targets->get_eid(subscription->targets,
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&eid_epoch);
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if (eid > 0)
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{
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eid = swima_state->get_earliest_eid(swima_state);
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subscription->targets->set_eid(subscription->targets, eid,
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eid_epoch);
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}
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}
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DBG1(DBG_IMC, "SWIMA subscription %u:", subscription->request_id);
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if (!poll_history_log())
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{
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return TNC_RESULT_FATAL;
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}
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return imc_swima->request_handshake_retry(imc_id, connection_id,
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TNC_RETRY_REASON_IMC_PERIODIC);
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}
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return TNC_RESULT_SUCCESS;
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case TNC_CONNECTION_STATE_DELETE:
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return imc_swima->delete_state(imc_swima, connection_id);
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default:
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return imc_swima->change_state(imc_swima, connection_id,
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new_state, NULL);
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}
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}
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/**
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* Add SWID Inventory or Event attribute to the send queue
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*/
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static void fulfill_request(imc_state_t *state, imc_msg_t *msg,
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uint32_t request_id, bool sw_id_only,
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swima_inventory_t *targets)
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{
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pa_tnc_attr_t *attr;
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swima_collector_t *collector;
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size_t msg_len = 64;
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char error_msg[msg_len], *id_str;
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bool collect_inventory = TRUE;
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int items;
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collector = swima_collector_create();
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id_str = sw_id_only ? " ID" : "";
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if (targets->get_eid(targets, NULL) > 0)
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{
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swima_events_t *sw_ev;
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ietf_swima_attr_sw_ev_t *sw_ev_attr;
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imc_swima_state_t *swima_state;
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uint32_t eid_epoch, last_eid = 0;
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sw_ev = collector->collect_events(collector, sw_id_only, targets);
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if (!sw_ev)
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{
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snprintf(error_msg, msg_len, "failed to collect SW%s events, "
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"fallback to SW%s inventory", id_str, id_str);
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attr = swima_error_create(PA_ERROR_SWIMA, request_id, 0, error_msg);
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msg->add_attribute(msg, attr);
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}
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else {
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items = sw_ev->get_count(sw_ev);
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last_eid = sw_ev->get_eid(sw_ev, &eid_epoch, NULL);
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DBG1(DBG_IMC, "collected %d SW%s event%s at last eid %d of epoch 0x%08x",
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items, id_str, items == 1 ? "" : "s", last_eid, eid_epoch);
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/* Store the earliest EID for the next subscription round */
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swima_state = (imc_swima_state_t*)state;
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swima_state->set_earliest_eid(swima_state, last_eid + 1);
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/* Send an IETF SW [Identity] Events attribute */
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attr = ietf_swima_attr_sw_ev_create(IETF_SWIMA_ATTR_SW_INV_FLAG_NONE,
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request_id, sw_id_only);
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sw_ev_attr = (ietf_swima_attr_sw_ev_t*)attr;
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sw_ev_attr->set_events(sw_ev_attr, sw_ev);
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collect_inventory = FALSE;
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}
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}
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if (collect_inventory)
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{
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swima_inventory_t *sw_inv;
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ietf_swima_attr_sw_inv_t *sw_inv_attr;
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sw_inv = collector->collect_inventory(collector, sw_id_only, targets);
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if (!sw_inv)
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{
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snprintf(error_msg, msg_len, "failed to collect SW%s inventory",
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id_str);
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attr = swima_error_create(PA_ERROR_SWIMA, request_id, 0, error_msg);
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}
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else
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{
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items = sw_inv->get_count(sw_inv);
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DBG1(DBG_IMC, "collected %d SW%s record%s", items, id_str,
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items == 1 ? "" : "s");
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/* Send an IETF SW [Identity] Inventory attribute */
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attr = ietf_swima_attr_sw_inv_create(IETF_SWIMA_ATTR_SW_INV_FLAG_NONE,
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request_id, sw_id_only);
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sw_inv_attr = (ietf_swima_attr_sw_inv_t*)attr;
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sw_inv_attr->set_inventory(sw_inv_attr, sw_inv);
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}
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}
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msg->add_attribute(msg, attr);
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collector->destroy(collector);
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}
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/**
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* see section 3.8.3 of TCG TNC IF-IMC Specification 1.3
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*/
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TNC_Result TNC_IMC_BeginHandshake(TNC_IMCID imc_id,
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TNC_ConnectionID connection_id)
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{
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imc_state_t *state;
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imc_swima_state_t *swima_state;
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imc_msg_t *out_msg;
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pa_tnc_attr_t *attr;
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seg_contract_t *contract;
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seg_contract_manager_t *contracts;
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imc_swima_subscription_t *subscription;
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size_t max_attr_size = SWIMA_MAX_ATTR_SIZE;
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size_t max_seg_size;
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char buf[BUF_LEN];
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TNC_Result result = TNC_RESULT_SUCCESS;
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if (!imc_swima)
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{
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DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
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return TNC_RESULT_NOT_INITIALIZED;
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}
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if (!imc_swima->get_state(imc_swima, connection_id, &state))
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{
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return TNC_RESULT_FATAL;
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}
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swima_state = (imc_swima_state_t*)state;
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if (swima_state->get_subscription(swima_state, &subscription))
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{
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if (system(SW_COLLECTOR) != 0)
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{
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DBG1(DBG_IMC, "calling %s failed", SW_COLLECTOR);
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return TNC_RESULT_FATAL;
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}
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out_msg = imc_msg_create(imc_swima, state, connection_id, imc_id,
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subscription->imv_id, msg_types[0]);
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fulfill_request(state, out_msg, subscription->request_id,
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subscription->sw_id_only, subscription->targets);
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}
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else
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{
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/* Determine maximum PA-TNC attribute segment size */
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max_seg_size = state->get_max_msg_len(state) - PA_TNC_HEADER_SIZE
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- PA_TNC_ATTR_HEADER_SIZE
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- TCG_SEG_ATTR_SEG_ENV_HEADER;
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/* Announce support of PA-TNC segmentation to IMV */
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contract = seg_contract_create(msg_types[0], max_attr_size, max_seg_size,
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TRUE, imc_id, TRUE);
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contract->get_info_string(contract, buf, BUF_LEN, TRUE);
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DBG2(DBG_IMC, "%s", buf);
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contracts = state->get_contracts(state);
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contracts->add_contract(contracts, contract);
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attr = tcg_seg_attr_max_size_create(max_attr_size, max_seg_size, TRUE);
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/* send PA-TNC message with the excl flag not set */
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out_msg = imc_msg_create(imc_swima, state, connection_id, imc_id,
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TNC_IMVID_ANY, msg_types[0]);
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out_msg->add_attribute(out_msg, attr);
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}
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result = out_msg->send(out_msg, FALSE);
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out_msg->destroy(out_msg);
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return result;
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}
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static TNC_Result receive_message(imc_state_t *state, imc_msg_t *in_msg)
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{
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imc_msg_t *out_msg;
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imc_swima_state_t *swima_state;
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pa_tnc_attr_t *attr;
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enumerator_t *enumerator;
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pen_type_t type;
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TNC_Result result;
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bool fatal_error = FALSE;
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/* generate an outgoing PA-TNC message - we might need it */
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out_msg = imc_msg_create_as_reply(in_msg);
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/* parse received PA-TNC message and handle local and remote errors */
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result = in_msg->receive(in_msg, out_msg, &fatal_error);
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if (result != TNC_RESULT_SUCCESS)
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{
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out_msg->destroy(out_msg);
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return result;
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}
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/* analyze PA-TNC attributes */
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enumerator = in_msg->create_attribute_enumerator(in_msg);
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while (enumerator->enumerate(enumerator, &attr))
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{
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ietf_swima_attr_req_t *attr_req;
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uint8_t flags;
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uint32_t request_id;
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bool sw_id_only;
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swima_inventory_t *targets;
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type = attr->get_type(attr);
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if (type.vendor_id != PEN_IETF || type.type != IETF_ATTR_SWIMA_REQUEST)
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{
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continue;
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}
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attr_req = (ietf_swima_attr_req_t*)attr;
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flags = attr_req->get_flags(attr_req);
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request_id = attr_req->get_request_id(attr_req);
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targets = attr_req->get_targets(attr_req);
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sw_id_only = (flags & IETF_SWIMA_ATTR_REQ_FLAG_R);
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if (flags & (IETF_SWIMA_ATTR_REQ_FLAG_S | IETF_SWIMA_ATTR_REQ_FLAG_C))
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{
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if (imc_swima->has_pt_tls(imc_swima) &&
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lib->settings->get_bool(lib->settings,
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"%s.plugins.imc-swima.subscriptions", FALSE, lib->ns))
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{
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imc_swima_subscription_t *subscription;
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swima_state = (imc_swima_state_t*)state;
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if (flags & IETF_SWIMA_ATTR_REQ_FLAG_C)
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{
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if (swima_state->get_subscription(swima_state, &subscription))
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{
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DBG1(DBG_IMC, "SWIMA subscription %u cleared",
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subscription->request_id);
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swima_state->set_subscription(swima_state, NULL, FALSE);
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}
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}
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else
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{
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INIT(subscription,
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.imv_id = in_msg->get_src_id(in_msg),
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.request_id = request_id,
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.targets = targets->get_ref(targets),
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.sw_id_only = sw_id_only,
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);
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swima_state->set_subscription(swima_state, subscription,
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TRUE);
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DBG1(DBG_IMC, "SWIMA subscription %u established",
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subscription->request_id);
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if (system(SW_COLLECTOR) != 0)
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{
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DBG1(DBG_IMC, "calling %s failed", SW_COLLECTOR);
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out_msg->destroy(out_msg);
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return TNC_RESULT_FATAL;
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}
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}
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}
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else
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{
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attr = swima_error_create(PA_ERROR_SWIMA_SUBSCRIPTION_DENIED,
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request_id, 0, "subscriptions not enabled");
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out_msg->add_attribute(out_msg, attr);
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}
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}
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fulfill_request(state, out_msg, request_id, sw_id_only, targets);
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break;
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}
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enumerator->destroy(enumerator);
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if (fatal_error)
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{
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result = TNC_RESULT_FATAL;
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|
}
|
|
else
|
|
{
|
|
/* send PA-TNC message with the EXCL flag set */
|
|
result = out_msg->send(out_msg, TRUE);
|
|
}
|
|
out_msg->destroy(out_msg);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* see section 3.8.4 of TCG TNC IF-IMC Specification 1.3
|
|
|
|
*/
|
|
TNC_Result TNC_IMC_ReceiveMessage(TNC_IMCID imc_id,
|
|
TNC_ConnectionID connection_id,
|
|
TNC_BufferReference msg,
|
|
TNC_UInt32 msg_len,
|
|
TNC_MessageType msg_type)
|
|
{
|
|
imc_state_t *state;
|
|
imc_msg_t *in_msg;
|
|
TNC_Result result;
|
|
|
|
if (!imc_swima)
|
|
{
|
|
DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
|
|
return TNC_RESULT_NOT_INITIALIZED;
|
|
}
|
|
if (!imc_swima->get_state(imc_swima, connection_id, &state))
|
|
{
|
|
return TNC_RESULT_FATAL;
|
|
}
|
|
in_msg = imc_msg_create_from_data(imc_swima, state, connection_id, msg_type,
|
|
chunk_create(msg, msg_len));
|
|
result = receive_message(state, in_msg);
|
|
in_msg->destroy(in_msg);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* see section 3.8.6 of TCG TNC IF-IMV Specification 1.3
|
|
*/
|
|
TNC_Result TNC_IMC_ReceiveMessageLong(TNC_IMCID imc_id,
|
|
TNC_ConnectionID connection_id,
|
|
TNC_UInt32 msg_flags,
|
|
TNC_BufferReference msg,
|
|
TNC_UInt32 msg_len,
|
|
TNC_VendorID msg_vid,
|
|
TNC_MessageSubtype msg_subtype,
|
|
TNC_UInt32 src_imv_id,
|
|
TNC_UInt32 dst_imc_id)
|
|
{
|
|
imc_state_t *state;
|
|
imc_msg_t *in_msg;
|
|
TNC_Result result;
|
|
|
|
if (!imc_swima)
|
|
{
|
|
DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
|
|
return TNC_RESULT_NOT_INITIALIZED;
|
|
}
|
|
if (!imc_swima->get_state(imc_swima, connection_id, &state))
|
|
{
|
|
return TNC_RESULT_FATAL;
|
|
}
|
|
in_msg = imc_msg_create_from_long_data(imc_swima, state, connection_id,
|
|
src_imv_id, dst_imc_id,msg_vid, msg_subtype,
|
|
chunk_create(msg, msg_len));
|
|
result =receive_message(state, in_msg);
|
|
in_msg->destroy(in_msg);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* see section 3.8.7 of TCG TNC IF-IMC Specification 1.3
|
|
*/
|
|
TNC_Result TNC_IMC_BatchEnding(TNC_IMCID imc_id,
|
|
TNC_ConnectionID connection_id)
|
|
{
|
|
if (!imc_swima)
|
|
{
|
|
DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
|
|
return TNC_RESULT_NOT_INITIALIZED;
|
|
}
|
|
return TNC_RESULT_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* see section 3.8.8 of TCG TNC IF-IMC Specification 1.3
|
|
*/
|
|
TNC_Result TNC_IMC_Terminate(TNC_IMCID imc_id)
|
|
{
|
|
if (!imc_swima)
|
|
{
|
|
DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
|
|
return TNC_RESULT_NOT_INITIALIZED;
|
|
}
|
|
imc_swima->destroy(imc_swima);
|
|
imc_swima = NULL;
|
|
|
|
return TNC_RESULT_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* see section 4.2.8.1 of TCG TNC IF-IMC Specification 1.3
|
|
*/
|
|
TNC_Result TNC_IMC_ProvideBindFunction(TNC_IMCID imc_id,
|
|
TNC_TNCC_BindFunctionPointer bind_function)
|
|
{
|
|
if (!imc_swima)
|
|
{
|
|
DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
|
|
return TNC_RESULT_NOT_INITIALIZED;
|
|
}
|
|
return imc_swima->bind_functions(imc_swima, bind_function);
|
|
}
|