312 lines
7.9 KiB
C
312 lines
7.9 KiB
C
/*
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* Copyright (C) 2010 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 "pb_remediation_parameters_msg.h"
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#include <bio/bio_writer.h>
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#include <bio/bio_reader.h>
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#include <utils/debug.h>
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ENUM(pb_tnc_remed_param_type_names, PB_REMEDIATION_URI, PB_REMEDIATION_STRING,
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"Remediation-URI",
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"Remediation-String"
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);
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typedef struct private_pb_remediation_parameters_msg_t private_pb_remediation_parameters_msg_t;
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/**
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* PB-Remediation-Parameters message (see section 4.8 of RFC 5793)
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reserved | Remediation Parameters Vendor ID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Remediation Parameters Type |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Remediation Parameters (Variable Length) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Remediation String Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Remediation String (Variable Length) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Lang Code Len | Remediation String Lang Code (Variable Len) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/**
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* Private data of a pb_remediation_parameters_msg_t object.
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*
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*/
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struct private_pb_remediation_parameters_msg_t {
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/**
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* Public pb_remediation_parameters_msg_t interface.
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*/
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pb_remediation_parameters_msg_t public;
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/**
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* PB-TNC message type
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*/
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pb_tnc_msg_type_t type;
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/**
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* Remediation Parameters Type
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*/
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pen_type_t parameters_type;
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/**
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* Remediation Parameters
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*/
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chunk_t parameters;
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/**
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* Remediation String
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*/
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chunk_t string;
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/**
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* Remediation Language Code
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*/
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chunk_t lang_code;
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/**
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* Encoded message
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*/
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chunk_t encoding;
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};
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METHOD(pb_tnc_msg_t, get_type, pb_tnc_msg_type_t,
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private_pb_remediation_parameters_msg_t *this)
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{
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return this->type;
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}
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METHOD(pb_tnc_msg_t, get_encoding, chunk_t,
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private_pb_remediation_parameters_msg_t *this)
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{
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return this->encoding;
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}
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METHOD(pb_tnc_msg_t, build, void,
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private_pb_remediation_parameters_msg_t *this)
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{
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bio_writer_t *writer;
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if (this->encoding.ptr)
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{
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return;
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}
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writer = bio_writer_create(64);
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writer->write_uint32(writer, this->parameters_type.vendor_id);
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writer->write_uint32(writer, this->parameters_type.type);
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writer->write_data32(writer, this->parameters);
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this->encoding = writer->get_buf(writer);
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this->encoding = chunk_clone(this->encoding);
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writer->destroy(writer);
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}
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METHOD(pb_tnc_msg_t, process, status_t,
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private_pb_remediation_parameters_msg_t *this, u_int32_t *offset)
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{
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bio_reader_t *reader;
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u_int8_t reserved;
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status_t status = SUCCESS;
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u_char *pos;
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*offset = 0;
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/* process message */
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reader = bio_reader_create(this->encoding);
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reader->read_uint8 (reader, &reserved);
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reader->read_uint24(reader, &this->parameters_type.vendor_id);
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reader->read_uint32(reader, &this->parameters_type.type);
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reader->read_data (reader, reader->remaining(reader), &this->parameters);
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this->parameters = chunk_clone(this->parameters);
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reader->destroy(reader);
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if (this->parameters_type.vendor_id == PEN_IETF &&
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this->parameters_type.type == PB_REMEDIATION_STRING)
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{
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reader = bio_reader_create(this->parameters);
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status = FAILED;
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*offset = 8;
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if (!reader->read_data32(reader, &this->string))
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{
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DBG1(DBG_TNC, "insufficient data for remediation string");
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goto end;
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};
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*offset += 4;
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pos = memchr(this->string.ptr, '\0', this->string.len);
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if (pos)
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{
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DBG1(DBG_TNC, "nul termination in remediation string");
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*offset += (pos - this->string.ptr);
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goto end;
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}
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*offset += this->string.len;
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if (!reader->read_data8(reader, &this->lang_code))
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{
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DBG1(DBG_TNC, "insufficient data for remediation string lang code");
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goto end;
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};
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*offset += 1;
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pos = memchr(this->lang_code.ptr, '\0', this->lang_code.len);
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if (pos)
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{
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DBG1(DBG_TNC, "nul termination in remediation string lang code");
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*offset += (pos - this->lang_code.ptr);
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goto end;
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}
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status = SUCCESS;
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end:
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reader->destroy(reader);
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}
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return status;
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}
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METHOD(pb_tnc_msg_t, destroy, void,
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private_pb_remediation_parameters_msg_t *this)
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{
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free(this->encoding.ptr);
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free(this->parameters.ptr);
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free(this);
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}
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METHOD(pb_remediation_parameters_msg_t, get_parameters_type, pen_type_t,
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private_pb_remediation_parameters_msg_t *this)
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{
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return this->parameters_type;
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}
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METHOD(pb_remediation_parameters_msg_t, get_parameters, chunk_t,
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private_pb_remediation_parameters_msg_t *this)
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{
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return this->parameters;
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}
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METHOD(pb_remediation_parameters_msg_t, get_string, chunk_t,
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private_pb_remediation_parameters_msg_t *this, chunk_t *lang_code)
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{
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if (lang_code)
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{
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*lang_code = this->lang_code;
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}
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return this->string;
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}
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/**
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* See header
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*/
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pb_tnc_msg_t* pb_remediation_parameters_msg_create(pen_type_t parameters_type,
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chunk_t parameters)
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{
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private_pb_remediation_parameters_msg_t *this;
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INIT(this,
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.public = {
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.pb_interface = {
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.get_type = _get_type,
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.get_encoding = _get_encoding,
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.build = _build,
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.process = _process,
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.destroy = _destroy,
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},
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.get_parameters_type = _get_parameters_type,
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.get_parameters = _get_parameters,
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.get_uri = _get_parameters,
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.get_string = _get_string,
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},
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.type = PB_MSG_REMEDIATION_PARAMETERS,
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.parameters_type = parameters_type,
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.parameters = chunk_clone(parameters),
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);
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return &this->public.pb_interface;
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}
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/**
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* Described in header.
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*/
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pb_tnc_msg_t* pb_remediation_parameters_msg_create_from_uri(chunk_t uri)
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{
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pen_type_t type = { PEN_IETF, PB_REMEDIATION_URI };
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return pb_remediation_parameters_msg_create(type, uri);
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}
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/**
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* Described in header.
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*/
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pb_tnc_msg_t* pb_remediation_parameters_msg_create_from_string(chunk_t string,
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chunk_t lang_code)
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{
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pb_tnc_msg_t *msg;
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bio_writer_t *writer;
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pen_type_t type = { PEN_IETF, PB_REMEDIATION_STRING };
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/* limit language code to 255 octets */
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lang_code.len = min(255, lang_code.len);
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writer = bio_writer_create(4 + string.len + 1 + lang_code.len);
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writer->write_data32(writer, string);
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writer->write_data8 (writer, lang_code);
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msg = pb_remediation_parameters_msg_create(type, writer->get_buf(writer));
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writer->destroy(writer);
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return msg;
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}
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/**
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* See header
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*/
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pb_tnc_msg_t *pb_remediation_parameters_msg_create_from_data(chunk_t data)
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{
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private_pb_remediation_parameters_msg_t *this;
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INIT(this,
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.public = {
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.pb_interface = {
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.get_type = _get_type,
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.get_encoding = _get_encoding,
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.build = _build,
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.process = _process,
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.destroy = _destroy,
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},
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.get_parameters_type = _get_parameters_type,
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.get_parameters = _get_parameters,
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.get_uri = _get_parameters,
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.get_string = _get_string,
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},
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.type = PB_MSG_REMEDIATION_PARAMETERS,
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.encoding = chunk_clone(data),
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);
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return &this->public.pb_interface;
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}
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