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/*
* Copyright (C) 2006 Mike McCauley (mikem@open.com.au)
* Copyright (C) 2010 Andreas Steffen, HSR Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "imc_imv_msg.h"
#include <tnc/tnccs/tnccs.h>
#include <utils/lexparser.h>
#include <utils/debug.h>
typedef struct private_imc_imv_msg_t private_imc_imv_msg_t;
#define BYTES_PER_LINE 57
/**
* Private data of a imc_imv_msg_t object.
*
*/
struct private_imc_imv_msg_t {
/**
* Public imc_imv_msg_t interface.
*/
imc_imv_msg_t public;
/**
* TNCCS message type
*/
tnccs_msg_type_t type;
/**
* XML-encoded message node
*/
xmlNodePtr node;
/**
* IMC-IMV message type
*/
TNC_MessageType msg_type;
/**
* IMC-IMV message body
*/
chunk_t msg_body;
};
/**
* Encodes message data into multiple base64-encoded lines
*/
static chunk_t encode_base64(chunk_t data)
{
chunk_t encoding;
u_char *pos;
size_t b64_chars, b64_lines;
/* handle empty message data object */
if (data.len == 0)
{
encoding = chunk_alloc(1);
*encoding.ptr = '\0';
return encoding;
}
/* compute and allocate maximum size of base64 object */
b64_chars = 4 * ((data.len + 2) / 3);
b64_lines = (data.len + BYTES_PER_LINE - 1) / BYTES_PER_LINE;
encoding = chunk_alloc(b64_chars + b64_lines);
pos = encoding.ptr;
/* encode lines */
while (b64_lines--)
{
chunk_t data_line, b64_line;
data_line = chunk_create(data.ptr, min(data.len, BYTES_PER_LINE));
data.ptr += data_line.len;
data.len -= data_line.len;
b64_line = chunk_to_base64(data_line, pos);
pos += b64_line.len;
*pos = '\n';
pos++;
}
/* terminate last line with NULL character instead of newline */
*(pos-1) = '\0';
return encoding;
}
/**
* Decodes message data from multiple base64-encoded lines
*/
static chunk_t decode_base64(chunk_t data)
{
chunk_t decoding, data_line, b64_line;
u_char *pos;
/* compute and allocate maximum size of decoded message data */
decoding = chunk_alloc(3 * ((data.len + 3) / 4));
pos = decoding.ptr;
decoding.len = 0;
while (fetchline(&data, &b64_line))
{
data_line = chunk_from_base64(b64_line, pos);
pos += data_line.len;
decoding.len += data_line.len;
}
return decoding;
}
METHOD(tnccs_msg_t, get_type, tnccs_msg_type_t,
private_imc_imv_msg_t *this)
{
return this->type;
}
METHOD(tnccs_msg_t, get_node, xmlNodePtr,
private_imc_imv_msg_t *this)
{
return this->node;
}
METHOD(tnccs_msg_t, destroy, void,
private_imc_imv_msg_t *this)
{
free(this->msg_body.ptr);
free(this);
}
METHOD(imc_imv_msg_t, get_msg_type, TNC_MessageType,
private_imc_imv_msg_t *this)
{
return this->msg_type;
}
METHOD(imc_imv_msg_t, get_msg_body, chunk_t,
private_imc_imv_msg_t *this)
{
return this->msg_body;
}
/**
* See header
*/
tnccs_msg_t *imc_imv_msg_create_from_node(xmlNodePtr node, linked_list_t *errors)
{
private_imc_imv_msg_t *this;
xmlNsPtr ns;
xmlNodePtr cur;
xmlChar *content;
chunk_t b64_body;
INIT(this,
.public = {
.tnccs_msg_interface = {
.get_type = _get_type,
.get_node = _get_node,
.destroy = _destroy,
},
.get_msg_type = _get_msg_type,
.get_msg_body = _get_msg_body,
},
.type = IMC_IMV_MSG,
.node = node,
);
ns = node->ns;
cur = node->xmlChildrenNode;
while (cur)
{
if (streq((char*)cur->name, "Type") && cur->ns == ns)
{
content = xmlNodeGetContent(cur);
this->msg_type = strtoul((char*)content, NULL, 16);
xmlFree(content);
}
else if (streq((char*)cur->name, "Base64") && cur->ns == ns)
{
content = xmlNodeGetContent(cur);
b64_body = chunk_create((char*)content, strlen((char*)content));
this->msg_body = decode_base64(b64_body);
xmlFree(content);
}
cur = cur->next;
}
return &this->public.tnccs_msg_interface;
}
/**
* See header
*/
tnccs_msg_t *imc_imv_msg_create(TNC_MessageType msg_type, chunk_t msg_body)
{
private_imc_imv_msg_t *this;
chunk_t b64_body;
char buf[10]; /* big enough for hex-encoded message type */
xmlNodePtr n;
INIT(this,
.public = {
.tnccs_msg_interface = {
.get_type = _get_type,
.get_node = _get_node,
.destroy = _destroy,
},
.get_msg_type = _get_msg_type,
.get_msg_body = _get_msg_body,
},
.type = IMC_IMV_MSG,
.node = xmlNewNode(NULL, BAD_CAST "IMC-IMV-Message"),
.msg_type = msg_type,
.msg_body = chunk_clone(msg_body),
);
/* add the message type number in hex */
n = xmlNewNode(NULL, BAD_CAST "Type");
snprintf(buf, 10, "%08x", this->msg_type);
xmlNodeSetContent(n, BAD_CAST buf);
xmlAddChild(this->node, n);
/* encode the message as a Base64 node */
n = xmlNewNode(NULL, BAD_CAST "Base64");
b64_body = encode_base64(this->msg_body);
xmlNodeSetContent(n, BAD_CAST b64_body.ptr);
xmlAddChild(this->node, n);
free(b64_body.ptr);
return &this->public.tnccs_msg_interface;
}
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