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/*
* Usurpation – clinet-server protocol implementation.
*
* Copyright (C) 2019 Ramūnas Mažeikis
* Copyright (C) 2019 Gediminas Jakutis
*
* This program 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; version 2.1
* of the License.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/**
* Common parts of protocol implementation. Handling of anything that actually
* deals with connection descriptor has to be implemented by device and daemon
* separately.
*/
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "tlv.h"
#include "utils.h"
#ifdef unix
#include <arpa/inet.h>
#else
#include <lwip/def.h>
#endif
int tlv_get(char *in, struct tlv *tlv, char **saveptr)
{
struct tlv_header head;
int ret = A_OK;
memcpy(&head, in, sizeof(head));
head = ntoh_tlvh(&head);
if (head.type == INVALID || !head.size) {
ret = NONEWDATA;
goto out;
}
tlv->head = head;
tlv->data = in + sizeof(head);
if (saveptr) {
*saveptr = in + sizeof(head) + head.size;
}
out:
return ret;
}
struct tlv_header ntoh_tlvh(const struct tlv_header * const in)
{
struct tlv_header ret;
ret.type = ntohl(in->type);
ret.size = ntohl(in->size);
return ret;
}
struct tlv_header hton_tlvh(const struct tlv_header * const in)
{
struct tlv_header ret;
ret.type = htonl(in->type);
ret.size = htonl(in->size);
return ret;
}
int tlv_pack(struct tlv_packet *pack, struct tlv *tlv)
{
struct tlv_header head;
size_t raw_size;
int ret = A_OK;
/* packed tlv loses the pointer, so only take the header part into account */
raw_size = sizeof(tlv->head) + tlv->head.size;
if ((raw_size + pack->cursor + sizeof(tlv->head)) >= TLV_SZ_MAX) {
ret = ERROR;
} else {
if (pack->size < pack->cursor + raw_size) {
pack->data = realloc(pack->data, pack->size + raw_size);
pack->size += raw_size;
}
head = tlv->head;
head = hton_tlvh(&head);
memcpy(pack->data + pack->cursor, &head, sizeof(head));
pack->cursor += sizeof(tlv->head);
if (tlv->head.size && tlv->data) {
memcpy(pack->data + pack->cursor, tlv->data, tlv->head.size);
pack->cursor += tlv->head.size;
}
}
return ret;
}
int tlv_packet_finalize(struct tlv_packet *pack)
{
struct tlv terminator;
int ret = A_OK;
terminator = tlv_none;
tlv_pack(pack, &terminator);
return ret;
}
struct tlv *tlv_init(struct tlv *in, enum tlv_type type)
{
in->head.type = type;
in->head.size = 0;
in->data = NULL;
return in;
}
void tlv_destroy(struct tlv *in)
{
free(in->data);
*in = tlv_none;
}
struct tlv_packet *tlv_packet_init(struct tlv_packet *in)
{
in->size = 0;
in->cursor = 0;
in->data = NULL;
return in;
}
struct tlv_packet *tlv_packet_reset(struct tlv_packet *in)
{
memset(in->data, 0, in->cursor);
in->cursor = 0;
return in;
}
void tlv_packet_destroy(struct tlv_packet *in)
{
free(in->data);
in->size = 0;
in->cursor = 0;
in->data = NULL;
}
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