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/* Copyright (C) 2015-2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */
#define _GNU_SOURCE
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/io.h>
#include <sys/ioctl.h>
#include <sys/reboot.h>
#include <sys/utsname.h>
#include <linux/random.h>
#include <linux/version.h>
__attribute__((noreturn)) static void poweroff(void)
{
fflush(stdout);
fflush(stderr);
#if defined(__x86_64__) || defined(__i386__)
ioperm(0x604, 2, 1);
outw(1U << 13, 0x604);
#endif
kill(-1, SIGKILL);
reboot(RB_POWER_OFF);
exit(1);
}
static void panic(const char *what)
{
fprintf(stderr, "\n\n\x1b[37m\x1b[41m\x1b[1mSOMETHING WENT HORRIBLY WRONG\x1b[0m\n\n \x1b[31m\x1b[1m%s: %s\x1b[0m\n\n\x1b[37m\x1b[44m\x1b[1mPower off...\x1b[0m\n\n", what, strerror(errno));
poweroff();
}
#define pretty_message(msg) puts("\x1b[32m\x1b[1m" msg "\x1b[0m")
static void print_banner(const struct utsname *utsname)
{
int len = strlen(" WireGuard Test Suite on ") + strlen(utsname->sysname) + strlen(utsname->release);
printf("\x1b[45m\x1b[33m\x1b[1m%*.s\x1b[0m\n\x1b[45m\x1b[33m\x1b[1m WireGuard Test Suite on %s %s \x1b[0m\n\x1b[45m\x1b[33m\x1b[1m%*.s\x1b[0m\n\n", len, "", utsname->sysname, utsname->release, len, "");
}
static void seed_rng(void)
{
int fd1, fd2, i;
struct {
int entropy_count;
int buffer_size;
unsigned char buffer[128];
} entropy = {
.entropy_count = 128,
.buffer_size = 128
};
pretty_message("[+] Ensuring RNG entropy...");
fd1 = open("/dev/hwrng", O_RDONLY);
fd2 = open("/dev/urandom", O_WRONLY);
if (fd1 < 0 || fd2 < 0)
panic("open(hwrng,urandom)");
for (i = 0; i < 4096; ++i) {
if (read(fd1, entropy.buffer, 128) != 128)
panic("read(hwrng)");
if (ioctl(fd2, RNDADDENTROPY, &entropy) < 0)
panic("ioctl(urandom)");
}
close(fd1);
close(fd2);
}
static void mount_filesystems(void)
{
pretty_message("[+] Mounting filesystems...");
mkdir("/dev", 0755);
mkdir("/proc", 0755);
mkdir("/sys", 0755);
mkdir("/tmp", 0755);
mkdir("/run", 0755);
mkdir("/var", 0755);
if (mount("none", "/dev", "devtmpfs", 0, NULL))
panic("devtmpfs mount");
if (mount("none", "/proc", "proc", 0, NULL))
panic("procfs mount");
if (mount("none", "/sys", "sysfs", 0, NULL))
panic("sysfs mount");
if (mount("none", "/tmp", "tmpfs", 0, NULL))
panic("tmpfs mount");
if (mount("none", "/run", "tmpfs", 0, NULL))
panic("tmpfs mount");
if (symlink("/run", "/var/run"))
panic("run symlink");
if (symlink("/proc/self/fd", "/dev/fd"))
panic("fd symlink");
}
static void enable_logging(void)
{
int fd;
pretty_message("[+] Enabling logging...");
fd = open("/proc/sys/kernel/printk", O_WRONLY);
if (fd < 0)
panic("open(printk)");
if (write(fd, "9\n", 2) != 2)
panic("write(printk)");
close(fd);
}
static void watchdog(void)
{
pretty_message("[+] Enabling watchdog timer...");
ioperm(0x443, 1, 1);
outb(14, 0x443);
if (fork())
return;
setpriority(PRIO_PROCESS, 0, -20);
for (;;) {
outb(14, 0x443);
sleep(1);
}
_exit(0);
}
static void kmod_selftests(void)
{
FILE *file;
char line[2048], *start, *pass;
bool success = true;
pretty_message("[+] Module self-tests:");
file = fopen("/proc/kmsg", "r");
if (!file)
panic("fopen(kmsg)");
if (fcntl(fileno(file), F_SETFL, O_NONBLOCK) < 0)
panic("fcntl(kmsg, nonblock)");
while (fgets(line, sizeof(line), file)) {
start = strstr(line, "wireguard: ");
if (!start)
continue;
start += 11;
*strchrnul(start, '\n') = '\0';
if (strstr(start, "www.wireguard.com"))
break;
pass = strstr(start, ": pass");
if (!pass || pass[6] != '\0') {
success = false;
printf(" \x1b[31m* %s\x1b[0m\n", start);
} else
printf(" \x1b[32m* %s\x1b[0m\n", start);
}
fclose(file);
if (!success) {
puts("\x1b[31m\x1b[1m[-] Tests failed! :-(\x1b[0m");
poweroff();
}
}
static void launch_tests(void)
{
int status, fd;
pid_t pid;
pretty_message("[+] Launching tests...");
pid = fork();
if (pid == -1)
panic("fork");
else if (pid == 0) {
execl("/init.sh", "init", NULL);
panic("exec");
}
if (waitpid(pid, &status, 0) < 0)
panic("waitpid");
if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
pretty_message("[+] Tests successful! :-)");
fd = open("/dev/vport1p1", O_WRONLY);
if (fd < 0)
panic("open(vport1p1)");
if (write(fd, "success\n", 8) != 8)
panic("write(success)");
close(fd);
} else
puts("\x1b[31m\x1b[1m[-] Tests failed! :-(\x1b[0m");
}
static bool linux_4_8_or_higher(const struct utsname *utsname)
{
unsigned int maj, min, rel;
if (strcmp(utsname->sysname, "Linux"))
return false;
if (sscanf(utsname->release, "%u.%u.%u", &maj, &min, &rel) != 3)
return false;
return KERNEL_VERSION(maj, min, rel) >= KERNEL_VERSION(4, 8, 0);
}
int main(int argc, char *argv[])
{
struct utsname utsname;
if (write(1, "\0\0\0\0\n", 5) < 0)
reboot(RB_AUTOBOOT);
if (uname(&utsname) < 0)
panic("uname");
print_banner(&utsname);
watchdog();
mount_filesystems();
kmod_selftests();
if (!linux_4_8_or_higher(&utsname))
seed_rng();
enable_logging();
launch_tests();
poweroff();
return 1;
}
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