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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2011-2014 Intel Corporation
* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
*
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#define _GNU_SOURCE
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/param.h>
#include <sys/epoll.h>
#include <sys/uio.h>
#include "lib/bluetooth.h"
#include "lib/hci.h"
#include "src/shared/mainloop.h"
#include "btdev.h"
#include "serial.h"
#define uninitialized_var(x) x = x
struct serial {
enum serial_type type;
uint16_t id;
int fd;
char path[PATH_MAX];
struct btdev *btdev;
uint8_t *pkt_data;
uint8_t pkt_type;
uint16_t pkt_expect;
uint16_t pkt_len;
uint16_t pkt_offset;
};
static void open_pty(struct serial *serial);
static void serial_destroy(void *user_data)
{
struct serial *serial = user_data;
btdev_destroy(serial->btdev);
serial->btdev = NULL;
close(serial->fd);
serial->fd = -1;
}
static void serial_write_callback(const struct iovec *iov, int iovlen,
void *user_data)
{
struct serial *serial = user_data;
ssize_t written;
written = writev(serial->fd, iov, iovlen);
if (written < 0)
return;
}
static void serial_read_callback(int fd, uint32_t events, void *user_data)
{
struct serial *serial = user_data;
static uint8_t buf[4096];
uint8_t *ptr = buf;
ssize_t len;
uint16_t count;
if (events & (EPOLLERR | EPOLLHUP)) {
mainloop_remove_fd(serial->fd);
open_pty(serial);
return;
}
again:
len = read(serial->fd, buf + serial->pkt_offset,
sizeof(buf) - serial->pkt_offset);
if (len < 0) {
if (errno == EAGAIN)
goto again;
return;
}
if (!serial->btdev)
return;
count = serial->pkt_offset + len;
while (count > 0) {
hci_command_hdr *cmd_hdr;
if (!serial->pkt_data) {
serial->pkt_type = ptr[0];
switch (serial->pkt_type) {
case HCI_COMMAND_PKT:
if (count < HCI_COMMAND_HDR_SIZE + 1) {
serial->pkt_offset += len;
return;
}
cmd_hdr = (hci_command_hdr *) (ptr + 1);
serial->pkt_expect = HCI_COMMAND_HDR_SIZE +
cmd_hdr->plen + 1;
serial->pkt_data = malloc(serial->pkt_expect);
serial->pkt_len = 0;
break;
default:
printf("packet error\n");
return;
}
serial->pkt_offset = 0;
}
if (count >= serial->pkt_expect) {
memcpy(serial->pkt_data + serial->pkt_len,
ptr, serial->pkt_expect);
ptr += serial->pkt_expect;
count -= serial->pkt_expect;
btdev_receive_h4(serial->btdev, serial->pkt_data,
serial->pkt_len + serial->pkt_expect);
free(serial->pkt_data);
serial->pkt_data = NULL;
} else {
memcpy(serial->pkt_data + serial->pkt_len, ptr, count);
serial->pkt_len += count;
serial->pkt_expect -= count;
count = 0;
}
}
}
static void open_pty(struct serial *serial)
{
enum btdev_type uninitialized_var(type);
serial->fd = posix_openpt(O_RDWR | O_NOCTTY);
if (serial->fd < 0) {
perror("Failed to get central pseudo terminal");
return;
}
if (grantpt(serial->fd) < 0) {
perror("Failed to grant peripheral pseudo terminal");
close(serial->fd);
serial->fd = -1;
return;
}
if (unlockpt(serial->fd) < 0) {
perror("Failed to unlock peripheral pseudo terminal");
close(serial->fd);
serial->fd = -1;
return;
}
ptsname_r(serial->fd, serial->path, sizeof(serial->path));
printf("Pseudo terminal at %s\n", serial->path);
switch (serial->type) {
case SERIAL_TYPE_BREDRLE:
type = BTDEV_TYPE_BREDRLE;
break;
case SERIAL_TYPE_BREDR:
type = BTDEV_TYPE_BREDR;
break;
case SERIAL_TYPE_LE:
type = BTDEV_TYPE_LE;
break;
case SERIAL_TYPE_AMP:
type = BTDEV_TYPE_AMP;
break;
}
serial->btdev = btdev_create(type, serial->id);
if (!serial->btdev) {
close(serial->fd);
serial->fd = -1;
return;
}
btdev_set_send_handler(serial->btdev, serial_write_callback, serial);
if (mainloop_add_fd(serial->fd, EPOLLIN, serial_read_callback,
serial, serial_destroy) < 0) {
btdev_destroy(serial->btdev);
serial->btdev = NULL;
close(serial->fd);
serial->fd = -1;
return;
}
}
struct serial *serial_open(enum serial_type type)
{
struct serial *serial;
enum btdev_type uninitialized_var(dev_type);
serial = malloc(sizeof(*serial));
if (!serial)
return NULL;
memset(serial, 0, sizeof(*serial));
serial->type = type;
serial->id = 0x42;
open_pty(serial);
return serial;
}
void serial_close(struct serial *serial)
{
if (!serial)
return;
mainloop_remove_fd(serial->fd);
free(serial);
}
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