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/*
* ESG parser
*
* Copyright (C) 2006 Stephane Este-Gracias (sestegra@free.fr)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdlib.h>
#include <string.h>
#include <libesg/transport/session_partition_declaration.h>
struct esg_session_partition_declaration *esg_session_partition_declaration_decode(uint8_t *buffer, uint32_t size) {
uint32_t pos;
struct esg_session_partition_declaration *partition;
struct esg_session_field *field;
struct esg_session_field *last_field;
uint8_t field_index;
struct esg_session_ip_stream *ip_stream;
struct esg_session_ip_stream *last_ip_stream;
uint8_t ip_stream_index;
uint8_t ip_index;
struct esg_session_ip_stream_field *ip_stream_field;
struct esg_session_ip_stream_field *last_ip_stream_field;
uint8_t *field_buffer;
uint32_t field_length;
union esg_session_ip_stream_field_value *field_value;
if ((buffer == NULL) || (size <= 2)) {
return NULL;
}
pos = 0;
partition = (struct esg_session_partition_declaration *) malloc(sizeof(struct esg_session_partition_declaration));
memset(partition, 0, sizeof(struct esg_session_partition_declaration));
partition->field_list = NULL;
partition->ip_stream_list = NULL;
partition->num_fields = buffer[pos];
pos += 1;
partition->overlapping = (buffer[pos] & 0x80) ? 1 : 0;
pos += 1;
if (size < (pos + 5*(partition->num_fields))) {
esg_session_partition_declaration_free(partition);
return NULL;
}
last_field = NULL;
for (field_index = 0; field_index < partition->num_fields; field_index++) {
field = (struct esg_session_field *) malloc(sizeof(struct esg_session_field));
memset(field, 0, sizeof(struct esg_session_field));
field->_next = NULL;
if (last_field == NULL) {
partition->field_list = field;
} else {
last_field->_next = field;
}
last_field = field;
field->identifier = (buffer[pos] << 8) | buffer[pos+1];
pos += 2;
field->encoding = (buffer[pos] << 8) | buffer[pos+1];
pos += 2;
field->length = buffer[pos];
pos += 1;
}
partition->n_o_ip_streams = buffer[pos];
pos += 1;
partition->ip_version_6 = (buffer[pos] & 0x80) ? 1 : 0;
pos += 1;
last_ip_stream = NULL;
for (ip_stream_index = 0; ip_stream_index < partition->n_o_ip_streams; ip_stream_index++) {
ip_stream = (struct esg_session_ip_stream *) malloc(sizeof(struct esg_session_ip_stream));
memset(ip_stream, 0, sizeof(struct esg_session_ip_stream));
ip_stream->_next = NULL;
if (last_ip_stream == NULL) {
partition->ip_stream_list = ip_stream;
} else {
last_ip_stream->_next = ip_stream;
}
last_ip_stream = ip_stream;
ip_stream->id = buffer[pos];
pos += 1;
if (partition->ip_version_6) {
for (ip_index = 0; ip_index < 16; ip_index++) {
ip_stream->source_ip.ipv6[ip_index] = buffer[pos+ip_index];
ip_stream->destination_ip.ipv6[ip_index] = buffer[pos+16+ip_index];
}
pos += 32;
} else {
for (ip_index = 0; ip_index < 4; ip_index++) {
ip_stream->source_ip.ipv4[ip_index] = buffer[pos+ip_index];
ip_stream->destination_ip.ipv4[ip_index] = buffer[pos+4+ip_index];
}
pos += 8;
}
ip_stream->port = (buffer[pos] << 8) | buffer[pos+1];
pos += 2;
ip_stream->session_id = (buffer[pos] << 8) | buffer[pos+1];
pos += 2;
last_ip_stream_field = NULL;
esg_session_partition_declaration_field_list_for_each(partition, field) {
ip_stream_field = (struct esg_session_ip_stream_field *) malloc(sizeof(struct esg_session_ip_stream_field));
memset(ip_stream_field, 0, sizeof(struct esg_session_ip_stream_field));
ip_stream_field->_next = NULL;
ip_stream_field->start_field_value = NULL;
ip_stream_field->end_field_value = NULL;
if (last_ip_stream_field == NULL) {
ip_stream->field_list = ip_stream_field;
} else {
last_ip_stream_field->_next = ip_stream_field;
}
last_ip_stream_field = ip_stream_field;
field_length = field->length;
if (field->length != 0) {
field_length = field->length;
} else {
pos += vluimsbf8(buffer + pos, size - pos, &field_length);
}
switch (field->encoding) {
case 0x0000: {
if (partition->overlapping == 1) {
field_value = (union esg_session_ip_stream_field_value *) malloc(sizeof(union esg_session_ip_stream_field_value));
memset(field_value, 0, sizeof(union esg_session_ip_stream_field_value));
ip_stream_field->start_field_value = field_value;
field_buffer = (uint8_t *) malloc(field_length);
memset(field_buffer, 0, field_length);
memcpy(field_buffer, buffer + pos, field_length);
ip_stream_field->start_field_value->string = field_buffer;
pos += field_length;
}
field_value = (union esg_session_ip_stream_field_value *) malloc(sizeof(union esg_session_ip_stream_field_value));
memset(field_value, 0, sizeof(union esg_session_ip_stream_field_value));
ip_stream_field->end_field_value = field_value;
field_buffer = (uint8_t *) malloc(field_length);
memset(field_buffer, 0, field_length);
memcpy(field_buffer, buffer + pos, field_length);
ip_stream_field->end_field_value->string = field_buffer;
pos += field_length;
break;
}
case 0x0101: {
if (partition->overlapping == 1) {
field_value = (union esg_session_ip_stream_field_value *) malloc(sizeof(union esg_session_ip_stream_field_value));
memset(field_value, 0, sizeof(union esg_session_ip_stream_field_value));
ip_stream_field->start_field_value = field_value;
ip_stream_field->start_field_value->unsigned_short = (buffer[pos] << 8) | buffer[pos+1];
pos += field_length;
}
field_value = (union esg_session_ip_stream_field_value *) malloc(sizeof(union esg_session_ip_stream_field_value));
memset(field_value, 0, sizeof(union esg_session_ip_stream_field_value));
ip_stream_field->end_field_value = field_value;
ip_stream_field->end_field_value->unsigned_short = (buffer[pos] << 8) | buffer[pos+1];
pos += field_length;
break;
}
default: {
esg_session_partition_declaration_free(partition);
return NULL;
}
}
}
}
return partition;
}
void esg_session_partition_declaration_free(struct esg_session_partition_declaration *partition) {
struct esg_session_field *field;
struct esg_session_field *next_field;
struct esg_session_ip_stream *ip_stream;
struct esg_session_ip_stream *next_ip_stream;
struct esg_session_ip_stream_field *ip_stream_field;
struct esg_session_ip_stream_field *next_ip_stream_field;
if (partition == NULL) {
return;
}
for(ip_stream = partition->ip_stream_list; ip_stream; ip_stream = next_ip_stream) {
next_ip_stream = ip_stream->_next;
field = partition->field_list;
for(ip_stream_field = next_ip_stream->field_list; ip_stream_field; ip_stream_field = next_ip_stream_field) {
next_ip_stream_field = ip_stream_field->_next;
switch (field->encoding) {
case 0x0000: {
if (ip_stream_field->start_field_value != NULL) {
free(ip_stream_field->start_field_value->string);
}
free(ip_stream_field->end_field_value->string);
break;
}
case 0x0101: {
// Nothing to free
break;
}
}
free(ip_stream_field);
field = field->_next;
}
free(ip_stream);
}
for(field = partition->field_list; field; field = next_field) {
next_field = field->_next;
free(field);
}
free(partition);
}
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