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/* Routines for generating and parsing messages */
/* (C) 2011 by Holger Hans Peter Freyther <zecke@selfish.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <osmocom/sigtran/xua_msg.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/talloc.h>
#include <arpa/inet.h>
#include <string.h>
static void *tall_xua;
static int DXUA = -1;
struct xua_msg *xua_msg_alloc(void)
{
struct xua_msg *msg;
msg = talloc_zero(tall_xua, struct xua_msg);
if (!msg) {
LOGP(DXUA, LOGL_ERROR, "Failed to allocate.\n");
return NULL;
}
INIT_LLIST_HEAD(&msg->headers);
return msg;
}
void xua_msg_free(struct xua_msg *msg)
{
talloc_free(msg);
}
int xua_msg_add_data(struct xua_msg *msg, uint16_t tag,
uint16_t len, uint8_t *dat)
{
struct xua_msg_part *part;
part = talloc_zero(msg, struct xua_msg_part);
if (!part)
return -1;
part->tag = tag;
part->len = len;
/* do we have any data? */
if (part->len != 0) {
part->dat = talloc_memdup(part, dat, len);
if (!part->dat) {
talloc_free(part);
return -1;
}
}
llist_add_tail(&part->entry, &msg->headers);
return 0;
}
struct xua_msg_part *xua_msg_find_tag(struct xua_msg *xua, uint16_t tag)
{
struct xua_msg_part *part;
llist_for_each_entry(part, &xua->headers, entry)
if (part->tag == tag)
return part;
return NULL;
}
struct xua_msg *xua_from_msg(const int version, uint16_t len, uint8_t *data)
{
struct xua_parameter_hdr *par;
struct xua_common_hdr *hdr;
struct xua_msg *msg;
uint16_t pos, par_len, padding;
int rc;
msg = xua_msg_alloc();
if (!msg)
return NULL;
if (len < sizeof(*hdr))
goto fail;
hdr = (struct xua_common_hdr *) data;
if (hdr->version != version)
goto fail;
if (ntohl(hdr->msg_length) > len)
goto fail;
msg->hdr = *hdr;
pos = sizeof(*hdr);
while (pos + sizeof(*par) < len) {
par = (struct xua_parameter_hdr *) &data[pos];
par_len = ntohs(par->len);
if (pos + par_len > len || par_len < 4)
goto fail;
rc = xua_msg_add_data(msg, ntohs(par->tag),
par_len - 4, par->data);
if (rc != 0)
goto fail;
pos += par_len;
/* move over the padding */
padding = (4 - (par_len % 4)) & 0x3;
pos += padding;
}
/* TODO: parse */
return msg;
fail:
LOGP(DXUA, LOGL_ERROR, "Failed to parse.\n");
xua_msg_free(msg);
return NULL;
}
struct msgb *xua_to_msg(const int version, struct xua_msg *xua)
{
struct xua_msg_part *part;
struct xua_common_hdr *hdr;
struct msgb *msg;
uint8_t rest;
msg = msgb_alloc_headroom(2048, 512, "xua msg");
if (!msg) {
LOGP(DXUA, LOGL_ERROR, "Failed to allocate.\n");
return NULL;
}
msg->l2h = msgb_put(msg, sizeof(*hdr));
hdr = (struct xua_common_hdr *) msg->l2h;
memcpy(hdr, &xua->hdr, sizeof(*hdr));
/* make sure that is right */
hdr->version = version;
hdr->spare = 0;
llist_for_each_entry(part, &xua->headers, entry) {
msgb_put_u16(msg, part->tag);
msgb_put_u16(msg, part->len + 4);
if (part->dat) {
uint8_t *dat = msgb_put(msg, part->len);
memcpy(dat, part->dat, part->len);
/* padding */
rest = (4 - (part->len % 4)) & 0x3;
if (rest > 0) {
dat = msgb_put(msg, rest);
memset(dat, 0, rest);
}
}
}
/* update the size of the data */
hdr->msg_length = htonl(msgb_l2len(msg));
return msg;
}
void xua_set_log_area(int log_area)
{
DXUA = log_area;
}
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