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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2002-2011 Marcel Holtmann <marcel@holtmann.org>
*
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#define _GNU_SOURCE
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "parser.h"
#define TABLE_SIZE 10
static struct {
uint16_t handle;
uint16_t cid;
struct frame msg[16];
} table[TABLE_SIZE];
static void add_segment(uint8_t bid, struct frame *frm, int len)
{
uint16_t handle = frm->handle, cid = frm->cid;
struct frame *msg;
void *data;
int i, pos = -1;
if (bid > 15)
return;
for (i = 0; i < TABLE_SIZE; i++) {
if (table[i].handle == handle && table[i].cid == cid) {
pos = i;
break;
}
if (pos < 0 && !table[i].handle && !table[i].cid)
pos = i;
}
if (pos < 0)
return;
table[pos].handle = handle;
table[pos].cid = cid;
msg = &table[pos].msg[bid];
data = malloc(msg->data_len + len);
if (!data)
return;
if (msg->data_len > 0)
memcpy(data, msg->data, msg->data_len);
memcpy(data + msg->data_len, frm->ptr, len);
free(msg->data);
msg->data = data;
msg->data_len += len;
msg->ptr = msg->data;
msg->len = msg->data_len;
msg->in = frm->in;
msg->ts = frm->ts;
msg->handle = handle;
msg->cid = cid;
}
static void free_segment(uint8_t bid, struct frame *frm)
{
uint16_t handle = frm->handle, cid = frm->cid;
struct frame *msg;
int i, len = 0, pos = -1;
if (bid > 15)
return;
for (i = 0; i < TABLE_SIZE; i++)
if (table[i].handle == handle && table[i].cid == cid) {
pos = i;
break;
}
if (pos < 0)
return;
msg = &table[pos].msg[bid];
if (msg->data)
free(msg->data);
msg->data = NULL;
msg->data_len = 0;
for (i = 0; i < 16; i++)
len += table[pos].msg[i].data_len;
if (!len) {
table[pos].handle = 0;
table[pos].cid = 0;
}
}
static struct frame *get_segment(uint8_t bid, struct frame *frm)
{
uint16_t handle = frm->handle, cid = frm->cid;
int i;
if (bid > 15)
return NULL;
for (i = 0; i < TABLE_SIZE; i++)
if (table[i].handle == handle && table[i].cid == cid)
return &table[i].msg[bid];
return NULL;
}
static char *bst2str(uint8_t bst)
{
switch (bst) {
case 0x00:
return "complete CAPI Message";
case 0x01:
return "segmented CAPI Message";
case 0x02:
return "error";
case 0x03:
return "reserved";
default:
return "unknown";
}
}
void cmtp_dump(int level, struct frame *frm)
{
struct frame *msg;
uint8_t hdr, bid;
uint16_t len;
while (frm->len > 0) {
hdr = p_get_u8(frm);
bid = (hdr & 0x3c) >> 2;
switch ((hdr & 0xc0) >> 6) {
case 0x01:
len = p_get_u8(frm);
break;
case 0x02:
len = htons(p_get_u16(frm));
break;
default:
len = 0;
break;
}
p_indent(level, frm);
printf("CMTP: %s: id %d len %d\n", bst2str(hdr & 0x03), bid, len);
switch (hdr & 0x03) {
case 0x00:
add_segment(bid, frm, len);
msg = get_segment(bid, frm);
if (!msg)
break;
if (!p_filter(FILT_CAPI))
capi_dump(level + 1, msg);
else
raw_dump(level, msg);
free_segment(bid, frm);
break;
case 0x01:
add_segment(bid, frm, len);
break;
default:
free_segment(bid, frm);
break;
}
frm->ptr += len;
frm->len -= len;
}
}
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