/*
* Copyright (C) 2020 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 "ita_attr_symlinks.h"
#include <pa_tnc/pa_tnc_msg.h>
#include <bio/bio_writer.h>
#include <bio/bio_reader.h>
#include <collections/linked_list.h>
#include <utils/debug.h>
typedef struct private_ita_attr_symlinks_t private_ita_attr_symlinks_t;
/**
* List of Symbolic Links pointing to Directories
*
* 1 2 3
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Number of Symlinks |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Symlink #1 Length | Symlink #1 Path (Var Len) ~
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Symlink #1 Path (Variable Length) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Directory #1 Length | Directory #1 Path (Var Len) ~
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Directory #1 Path (Variable Length) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Symlink #2 Length | Symlink #2 Path (Var Len) ~
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Symlink #2 Path (Variable Length) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Directory #2 Length | Directory #2 Path (Var Len) ~
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Directory #2 Path (Variable Length) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* ...........................
*/
#define ITA_ATTR_SYMLINKS_SIZE 4
/**
* Private data of an ita_attr_symlinks_t object.
*/
struct private_ita_attr_symlinks_t {
/**
* Public members of ita_attr_symlinks_t
*/
ita_attr_symlinks_t public;
/**
* Vendor-specific attribute type
*/
pen_type_t type;
/**
* Length of attribute value
*/
size_t length;
/**
* Offset up to which attribute value has been processed
*/
size_t offset;
/**
* Current position of attribute value pointer
*/
chunk_t value;
/**
* Contains complete attribute or current segment
*/
chunk_t segment;
/**
* Noskip flag
*/
bool noskip_flag;
/**
* Number of symbolic link entries
*/
uint32_t count;
/**
* List of symbolic links
*/
pts_symlinks_t *symlinks;
/**
* Reference count
*/
refcount_t ref;
};
METHOD(pa_tnc_attr_t, get_type, pen_type_t,
private_ita_attr_symlinks_t *this)
{
return this->type;
}
METHOD(pa_tnc_attr_t, get_value, chunk_t,
private_ita_attr_symlinks_t *this)
{
return this->value;
}
METHOD(pa_tnc_attr_t, get_noskip_flag, bool,
private_ita_attr_symlinks_t *this)
{
return this->noskip_flag;
}
METHOD(pa_tnc_attr_t, set_noskip_flag,void,
private_ita_attr_symlinks_t *this, bool noskip)
{
this->noskip_flag = noskip;
}
METHOD(pa_tnc_attr_t, build, void,
private_ita_attr_symlinks_t *this)
{
bio_writer_t *writer;
enumerator_t *enumerator;
chunk_t symlink, dir;
if (this->value.ptr)
{
return;
}
this->count = this->symlinks->get_count(this->symlinks);
writer = bio_writer_create(ITA_ATTR_SYMLINKS_SIZE);
writer->write_uint32(writer, this->count);
enumerator = this->symlinks->create_enumerator(this->symlinks);
while (enumerator->enumerate(enumerator, &symlink, &dir))
{
writer->write_data16(writer, symlink);
writer->write_data16(writer, dir);
}
enumerator->destroy(enumerator);
this->value = writer->extract_buf(writer);
this->segment = this->value;
this->length = this->value.len;
writer->destroy(writer);
}
METHOD(pa_tnc_attr_t, process, status_t,
private_ita_attr_symlinks_t *this, uint32_t *offset)
{
bio_reader_t *reader;
chunk_t symlink, dir;
status_t status = NEED_MORE;
if (this->offset == 0)
{
if (this->length < ITA_ATTR_SYMLINKS_SIZE)
{
DBG1(DBG_TNC, "insufficient data for %N/%N", pen_names, PEN_ITA,
ita_attr_names, this->type.type);
*offset = this->offset;
return FAILED;
}
if (this->value.len < ITA_ATTR_SYMLINKS_SIZE)
{
return NEED_MORE;
}
reader = bio_reader_create(this->value);
reader->read_uint32(reader, &this->count);
this->offset = ITA_ATTR_SYMLINKS_SIZE;
this->value = reader->peek(reader);
reader->destroy(reader);
}
this->symlinks = pts_symlinks_create();
reader = bio_reader_create(this->value);
while (this->count)
{
if (!reader->read_data16(reader, &symlink) ||
!reader->read_data16(reader, &dir))
{
goto end;
}
this->offset += this->value.len - reader->remaining(reader);
this->value = reader->peek(reader);
this->symlinks->add(this->symlinks, symlink, dir);
this->count--;
}
status = SUCCESS;
if (this->length != this->offset)
{
DBG1(DBG_TNC, "inconsistent length for %N/%N", pen_names, PEN_ITA,
ita_attr_names, this->type.type);
*offset = this->offset;
status = FAILED;
}
end:
reader->destroy(reader);
return status;
}
METHOD(pa_tnc_attr_t, add_segment, void,
private_ita_attr_symlinks_t *this, chunk_t segment)
{
this->value = chunk_cat("cc", this->value, segment);
chunk_free(&this->segment);
this->segment = this->value;
}
METHOD(pa_tnc_attr_t, get_ref, pa_tnc_attr_t*,
private_ita_attr_symlinks_t *this)
{
ref_get(&this->ref);
return &this->public.pa_tnc_attribute;
}
METHOD(pa_tnc_attr_t, destroy, void,
private_ita_attr_symlinks_t *this)
{
if (ref_put(&this->ref))
{
DESTROY_IF(this->symlinks);
free(this->segment.ptr);
free(this);
}
}
METHOD(ita_attr_symlinks_t, get_symlinks, pts_symlinks_t*,
private_ita_attr_symlinks_t *this)
{
return this->symlinks;
}
/**
* Described in header.
*/
pa_tnc_attr_t *ita_attr_symlinks_create(pts_symlinks_t *symlinks)
{
private_ita_attr_symlinks_t *this;
INIT(this,
.public = {
.pa_tnc_attribute = {
.get_type = _get_type,
.get_value = _get_value,
.get_noskip_flag = _get_noskip_flag,
.set_noskip_flag = _set_noskip_flag,
.build = _build,
.process = _process,
.add_segment = _add_segment,
.get_ref = _get_ref,
.destroy = _destroy,
},
.get_symlinks = _get_symlinks,
},
.type = { PEN_ITA, ITA_ATTR_SYMLINKS },
.symlinks = symlinks->get_ref(symlinks),
.ref = 1,
);
return &this->public.pa_tnc_attribute;
}
/**
* Described in header.
*/
pa_tnc_attr_t *ita_attr_symlinks_create_from_data(size_t length, chunk_t data)
{
private_ita_attr_symlinks_t *this;
INIT(this,
.public = {
.pa_tnc_attribute = {
.get_type = _get_type,
.get_value = _get_value,
.get_noskip_flag = _get_noskip_flag,
.set_noskip_flag = _set_noskip_flag,
.build = _build,
.process = _process,
.add_segment = _add_segment,
.get_ref = _get_ref,
.destroy = _destroy,
},
.get_symlinks = _get_symlinks,
},
.type = { PEN_ITA, ITA_ATTR_SYMLINKS },
.length = length,
.segment = chunk_clone(data),
.ref = 1,
);
/* received either complete attribute value or first segment */
this->value = this->segment;
return &this->public.pa_tnc_attribute;
}
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