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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2015-2019 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/stat.h>
#include <sys/types.h>
#include <sys/io.h>
#include <sys/ioctl.h>
#include <sys/reboot.h>
#include <sys/utsname.h>
#include <sys/sendfile.h>
#include <sys/sysmacros.h>
#include <linux/random.h>
#include <linux/version.h>
__attribute__((noreturn)) static void poweroff(void)
{
fflush(stdout);
fflush(stderr);
reboot(RB_AUTOBOOT);
sleep(30);
fprintf(stderr, "\x1b[37m\x1b[41m\x1b[1mFailed to power off!!!\x1b[0m\n");
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(void)
{
struct utsname utsname;
int len;
if (uname(&utsname) < 0)
panic("uname");
len = strlen(" WireGuard Test Suite on ") + strlen(utsname.sysname) + strlen(utsname.release) + strlen(utsname.machine);
printf("\x1b[45m\x1b[33m\x1b[1m%*.s\x1b[0m\n\x1b[45m\x1b[33m\x1b[1m WireGuard Test Suite on %s %s %s \x1b[0m\n\x1b[45m\x1b[33m\x1b[1m%*.s\x1b[0m\n\n", len, "", utsname.sysname, utsname.release, utsname.machine, len, "");
}
static void seed_rng(void)
{
int fd;
struct {
int entropy_count;
int buffer_size;
unsigned char buffer[256];
} entropy = {
.entropy_count = sizeof(entropy.buffer) * 8,
.buffer_size = sizeof(entropy.buffer),
.buffer = "Adding real entropy is not actually important for these tests. Don't try this at home, kids!"
};
if (mknod("/dev/urandom", S_IFCHR | 0644, makedev(1, 9)))
panic("mknod(/dev/urandom)");
fd = open("/dev/urandom", O_WRONLY);
if (fd < 0)
panic("open(urandom)");
for (int i = 0; i < 256; ++i) {
if (ioctl(fd, RNDADDENTROPY, &entropy) < 0)
panic("ioctl(urandom)");
}
close(fd);
}
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 (mount("none", "/sys/kernel/debug", "debugfs", 0, NULL))
; /* Not a problem if it fails.*/
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) {
if (write(fd, "9\n", 2) != 2)
panic("write(printk)");
close(fd);
}
fd = open("/proc/sys/debug/exception-trace", O_WRONLY);
if (fd >= 0) {
if (write(fd, "1\n", 2) != 2)
panic("write(exception-trace)");
close(fd);
}
fd = open("/proc/sys/kernel/panic_on_warn", O_WRONLY);
if (fd >= 0) {
if (write(fd, "1\n", 2) != 2)
panic("write(panic_on_warn)");
close(fd);
}
}
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! \u2639\x1b[0m");
poweroff();
}
}
static void launch_tests(void)
{
char cmdline[4096], *success_dev;
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("/proc/cmdline", O_RDONLY);
if (fd < 0)
panic("open(/proc/cmdline)");
if (read(fd, cmdline, sizeof(cmdline) - 1) <= 0)
panic("read(/proc/cmdline)");
cmdline[sizeof(cmdline) - 1] = '\0';
for (success_dev = strtok(cmdline, " \n"); success_dev; success_dev = strtok(NULL, " \n")) {
if (strncmp(success_dev, "wg.success=", 11))
continue;
memcpy(success_dev + 11 - 5, "/dev/", 5);
success_dev += 11 - 5;
break;
}
if (!success_dev || !strlen(success_dev))
panic("Unable to find success device");
fd = open(success_dev, O_WRONLY);
if (fd < 0)
panic("open(success_dev)");
if (write(fd, "success\n", 8) != 8)
panic("write(success_dev)");
close(fd);
} else {
const char *why = "unknown cause";
int what = -1;
if (WIFEXITED(status)) {
why = "exit code";
what = WEXITSTATUS(status);
} else if (WIFSIGNALED(status)) {
why = "signal";
what = WTERMSIG(status);
}
printf("\x1b[31m\x1b[1m[-] Tests failed with %s %d! \u2639\x1b[0m\n", why, what);
}
}
static void ensure_console(void)
{
for (unsigned int i = 0; i < 1000; ++i) {
int fd = open("/dev/console", O_RDWR);
if (fd < 0) {
usleep(50000);
continue;
}
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
close(fd);
if (write(1, "\0\0\0\0\n", 5) == 5)
return;
}
panic("Unable to open console device");
}
static void clear_leaks(void)
{
int fd;
fd = open("/sys/kernel/debug/kmemleak", O_WRONLY);
if (fd < 0)
return;
pretty_message("[+] Starting memory leak detection...");
write(fd, "clear\n", 5);
close(fd);
}
static void check_leaks(void)
{
int fd;
fd = open("/sys/kernel/debug/kmemleak", O_WRONLY);
if (fd < 0)
return;
pretty_message("[+] Scanning for memory leaks...");
sleep(2); /* Wait for any grace periods. */
write(fd, "scan\n", 5);
close(fd);
fd = open("/sys/kernel/debug/kmemleak", O_RDONLY);
if (fd < 0)
return;
if (sendfile(1, fd, NULL, 0x7ffff000) > 0)
panic("Memory leaks encountered");
close(fd);
}
int main(int argc, char *argv[])
{
seed_rng();
ensure_console();
print_banner();
mount_filesystems();
kmod_selftests();
enable_logging();
clear_leaks();
launch_tests();
check_leaks();
poweroff();
return 1;
}
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