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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2015 Intel Corporation. All rights reserved.
*
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#define _GNU_SOURCE
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdbool.h>
#include <signal.h>
#include <string.h>
#include <poll.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mount.h>
#ifndef WAIT_ANY
#define WAIT_ANY (-1)
#endif
#include "src/shared/mainloop.h"
#include "src/shared/util.h"
#include "peripheral/efivars.h"
#include "peripheral/attach.h"
#include "peripheral/gap.h"
#include "peripheral/log.h"
static bool is_init = false;
static pid_t shell_pid = -1;
static const struct {
const char *target;
const char *linkpath;
} dev_table[] = {
{ "/proc/self/fd", "/dev/fd" },
{ "/proc/self/fd/0", "/dev/stdin" },
{ "/proc/self/fd/1", "/dev/stdout" },
{ "/proc/self/fd/2", "/dev/stderr" },
{ }
};
static const struct {
const char *fstype;
const char *target;
const char *options;
unsigned long flags;
} mount_table[] = {
{ "sysfs", "/sys", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV },
{ "proc", "/proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV },
{ "devtmpfs", "/dev", NULL, MS_NOSUID|MS_STRICTATIME },
{ "efivarfs", "/sys/firmware/efi/efivars",
NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV },
{ "pstore", "/sys/fs/pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV },
{ }
};
static void prepare_filesystem(void)
{
int i;
if (!is_init)
return;
for (i = 0; mount_table[i].fstype && mount_table[i].target; i++) {
struct stat st;
if (lstat(mount_table[i].target, &st) < 0) {
printf("Creating %s\n", mount_table[i].target);
if (mkdir(mount_table[i].target, 0755) < 0)
perror("Failed to create dir");
}
printf("Mounting %s to %s\n", mount_table[i].fstype,
mount_table[i].target);
if (mount(mount_table[i].fstype,
mount_table[i].target,
mount_table[i].fstype,
mount_table[i].flags, NULL) < 0)
perror("Failed to mount filesystem");
}
for (i = 0; dev_table[i].target; i++) {
printf("Linking %s to %s\n", dev_table[i].linkpath,
dev_table[i].target);
if (symlink(dev_table[i].target, dev_table[i].linkpath) < 0)
perror("Failed to create device symlink");
}
}
static void run_shell(void)
{
pid_t pid;
printf("Starting shell\n");
pid = fork();
if (pid < 0) {
perror("Failed to fork new process");
return;
}
if (pid == 0) {
char *prg_argv[] = { "/bin/sh", NULL };
char *prg_envp[] = { NULL };
execve(prg_argv[0], prg_argv, prg_envp);
exit(0);
}
printf("PID %d created\n", pid);
shell_pid = pid;
}
static void exit_shell(void)
{
shell_pid = -1;
if (!is_init) {
mainloop_quit();
return;
}
run_shell();
}
static void signal_callback(int signum, void *user_data)
{
switch (signum) {
case SIGINT:
case SIGTERM:
mainloop_quit();
break;
case SIGCHLD:
while (1) {
pid_t pid;
int status;
pid = waitpid(WAIT_ANY, &status, WNOHANG);
if (pid < 0 || pid == 0)
break;
if (WIFEXITED(status)) {
printf("PID %d exited (status=%d)\n",
pid, WEXITSTATUS(status));
if (pid == shell_pid)
exit_shell();
} else if (WIFSIGNALED(status)) {
printf("PID %d terminated (signal=%d)\n",
pid, WTERMSIG(status));
if (pid == shell_pid)
exit_shell();
}
}
break;
}
}
int main(int argc, char *argv[])
{
int exit_status;
if (getpid() == 1 && getppid() == 0)
is_init = true;
mainloop_init();
printf("Bluetooth periperhal ver %s\n", VERSION);
prepare_filesystem();
if (is_init) {
uint8_t addr[6];
if (efivars_read("BluetoothStaticAddress", NULL,
addr, 6) < 0) {
printf("Generating new persistent static address\n");
if (util_getrandom(addr, sizeof(addr), 0) < 0) {
perror("Failed to get random static address");
return EXIT_FAILURE;
}
/* Overwrite the MSB to make it a static address */
addr[5] = 0xc0;
efivars_write("BluetoothStaticAddress",
EFIVARS_NON_VOLATILE |
EFIVARS_BOOTSERVICE_ACCESS |
EFIVARS_RUNTIME_ACCESS,
addr, 6);
}
gap_set_static_address(addr);
run_shell();
}
log_open();
gap_start();
if (is_init)
attach_start();
exit_status = mainloop_run_with_signal(signal_callback, NULL);
if (is_init)
attach_stop();
gap_stop();
log_close();
return exit_status;
}
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