tools/testing/selftests/wireguard/qemu/init.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
   4  */
   5
   6 #define _GNU_SOURCE
   7 #include <unistd.h>
   8 #include <errno.h>
   9 #include <string.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <stdbool.h>
  13 #include <fcntl.h>
  14 #include <time.h>
  15 #include <sys/wait.h>
  16 #include <sys/mount.h>
  17 #include <sys/stat.h>
  18 #include <sys/types.h>
  19 #include <sys/io.h>
  20 #include <sys/ioctl.h>
  21 #include <sys/reboot.h>
  22 #include <sys/utsname.h>
  23 #include <sys/sendfile.h>
  24 #include <sys/sysmacros.h>
  25 #include <sys/random.h>
  26 #include <linux/random.h>
  27 #include <linux/version.h>
  28
  29 __attribute__((noreturn)) static void poweroff(void)
  30 {
  31         fflush(stdout);
  32         fflush(stderr);
  33         reboot(RB_AUTOBOOT);
  34         sleep(30);
  35         fprintf(stderr, "\x1b[37m\x1b[41m\x1b[1mFailed to power off!!!\x1b[0m\n");
  36         exit(1);
  37 }
  38
  39 static void panic(const char *what)
  40 {
  41         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));
  42         poweroff();
  43 }
  44
  45 #define pretty_message(msg) puts("\x1b[32m\x1b[1m" msg "\x1b[0m")
  46
  47 static void print_banner(void)
  48 {
  49         struct utsname utsname;
  50         int len;
  51
  52         if (uname(&utsname) < 0)
  53                 panic("uname");
  54
  55         len = strlen("    WireGuard Test Suite on       ") + strlen(utsname.sysname) + strlen(utsname.release) + strlen(utsname.machine);
  56         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, "");
  57 }
  58
  59 static void seed_rng(void)
  60 {
  61         int bits = 256, fd;
  62
  63         if (!getrandom(NULL, 0, GRND_NONBLOCK))
  64                 return;
  65         pretty_message("[+] Fake seeding RNG...");
  66         fd = open("/dev/random", O_WRONLY);
  67         if (fd < 0)
  68                 panic("open(random)");
  69         if (ioctl(fd, RNDADDTOENTCNT, &bits) < 0)
  70                 panic("ioctl(RNDADDTOENTCNT)");
  71         close(fd);
  72 }
  73
  74 static void set_time(void)
  75 {
  76         if (time(NULL))
  77                 return;
  78         pretty_message("[+] Setting fake time...");
  79         if (stime(&(time_t){1433512680}) < 0)
  80                 panic("settimeofday()");
  81 }
  82
  83 static void mount_filesystems(void)
  84 {
  85         pretty_message("[+] Mounting filesystems...");
  86         mkdir("/dev", 0755);
  87         mkdir("/proc", 0755);
  88         mkdir("/sys", 0755);
  89         mkdir("/tmp", 0755);
  90         mkdir("/run", 0755);
  91         mkdir("/var", 0755);
  92         if (mount("none", "/dev", "devtmpfs", 0, NULL))
  93                 panic("devtmpfs mount");
  94         if (mount("none", "/proc", "proc", 0, NULL))
  95                 panic("procfs mount");
  96         if (mount("none", "/sys", "sysfs", 0, NULL))
  97                 panic("sysfs mount");
  98         if (mount("none", "/tmp", "tmpfs", 0, NULL))
  99                 panic("tmpfs mount");
 100         if (mount("none", "/run", "tmpfs", 0, NULL))
 101                 panic("tmpfs mount");
 102         if (mount("none", "/sys/kernel/debug", "debugfs", 0, NULL))
 103                 ; /* Not a problem if it fails.*/
 104         if (symlink("/run", "/var/run"))
 105                 panic("run symlink");
 106         if (symlink("/proc/self/fd", "/dev/fd"))
 107                 panic("fd symlink");
 108 }
 109
 110 static void enable_logging(void)
 111 {
 112         int fd;
 113         pretty_message("[+] Enabling logging...");
 114         fd = open("/proc/sys/kernel/printk", O_WRONLY);
 115         if (fd >= 0) {
 116                 if (write(fd, "9\n", 2) != 2)
 117                         panic("write(printk)");
 118                 close(fd);
 119         }
 120         fd = open("/proc/sys/debug/exception-trace", O_WRONLY);
 121         if (fd >= 0) {
 122                 if (write(fd, "1\n", 2) != 2)
 123                         panic("write(exception-trace)");
 124                 close(fd);
 125         }
 126 }
 127
 128 static void kmod_selftests(void)
 129 {
 130         FILE *file;
 131         char line[2048], *start, *pass;
 132         bool success = true;
 133         pretty_message("[+] Module self-tests:");
 134         file = fopen("/proc/kmsg", "r");
 135         if (!file)
 136                 panic("fopen(kmsg)");
 137         if (fcntl(fileno(file), F_SETFL, O_NONBLOCK) < 0)
 138                 panic("fcntl(kmsg, nonblock)");
 139         while (fgets(line, sizeof(line), file)) {
 140                 start = strstr(line, "wireguard: ");
 141                 if (!start)
 142                         continue;
 143                 start += 11;
 144                 *strchrnul(start, '\n') = '\0';
 145                 if (strstr(start, "www.wireguard.com"))
 146                         break;
 147                 pass = strstr(start, ": pass");
 148                 if (!pass || pass[6] != '\0') {
 149                         success = false;
 150                         printf(" \x1b[31m*  %s\x1b[0m\n", start);
 151                 } else
 152                         printf(" \x1b[32m*  %s\x1b[0m\n", start);
 153         }
 154         fclose(file);
 155         if (!success) {
 156                 puts("\x1b[31m\x1b[1m[-] Tests failed! \u2639\x1b[0m");
 157                 poweroff();
 158         }
 159 }
 160
 161 static void launch_tests(void)
 162 {
 163         char cmdline[4096], *success_dev;
 164         int status, fd;
 165         pid_t pid;
 166
 167         pretty_message("[+] Launching tests...");
 168         pid = fork();
 169         if (pid == -1)
 170                 panic("fork");
 171         else if (pid == 0) {
 172                 execl("/init.sh", "init", NULL);
 173                 panic("exec");
 174         }
 175         if (waitpid(pid, &status, 0) < 0)
 176                 panic("waitpid");
 177         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
 178                 pretty_message("[+] Tests successful! :-)");
 179                 fd = open("/proc/cmdline", O_RDONLY);
 180                 if (fd < 0)
 181                         panic("open(/proc/cmdline)");
 182                 if (read(fd, cmdline, sizeof(cmdline) - 1) <= 0)
 183                         panic("read(/proc/cmdline)");
 184                 cmdline[sizeof(cmdline) - 1] = '\0';
 185                 for (success_dev = strtok(cmdline, " \n"); success_dev; success_dev = strtok(NULL, " \n")) {
 186                         if (strncmp(success_dev, "wg.success=", 11))
 187                                 continue;
 188                         memcpy(success_dev + 11 - 5, "/dev/", 5);
 189                         success_dev += 11 - 5;
 190                         break;
 191                 }
 192                 if (!success_dev || !strlen(success_dev))
 193                         panic("Unable to find success device");
 194
 195                 fd = open(success_dev, O_WRONLY);
 196                 if (fd < 0)
 197                         panic("open(success_dev)");
 198                 if (write(fd, "success\n", 8) != 8)
 199                         panic("write(success_dev)");
 200                 close(fd);
 201         } else {
 202                 const char *why = "unknown cause";
 203                 int what = -1;
 204
 205                 if (WIFEXITED(status)) {
 206                         why = "exit code";
 207                         what = WEXITSTATUS(status);
 208                 } else if (WIFSIGNALED(status)) {
 209                         why = "signal";
 210                         what = WTERMSIG(status);
 211                 }
 212                 printf("\x1b[31m\x1b[1m[-] Tests failed with %s %d! \u2639\x1b[0m\n", why, what);
 213         }
 214 }
 215
 216 static void ensure_console(void)
 217 {
 218         for (unsigned int i = 0; i < 1000; ++i) {
 219                 int fd = open("/dev/console", O_RDWR);
 220                 if (fd < 0) {
 221                         usleep(50000);
 222                         continue;
 223                 }
 224                 dup2(fd, 0);
 225                 dup2(fd, 1);
 226                 dup2(fd, 2);
 227                 close(fd);
 228                 if (write(1, "\0\0\0\0\n", 5) == 5)
 229                         return;
 230         }
 231         panic("Unable to open console device");
 232 }
 233
 234 static void clear_leaks(void)
 235 {
 236         int fd;
 237
 238         fd = open("/sys/kernel/debug/kmemleak", O_WRONLY);
 239         if (fd < 0)
 240                 return;
 241         pretty_message("[+] Starting memory leak detection...");
 242         write(fd, "clear\n", 5);
 243         close(fd);
 244 }
 245
 246 static void check_leaks(void)
 247 {
 248         int fd;
 249
 250         fd = open("/sys/kernel/debug/kmemleak", O_WRONLY);
 251         if (fd < 0)
 252                 return;
 253         pretty_message("[+] Scanning for memory leaks...");
 254         sleep(2); /* Wait for any grace periods. */
 255         write(fd, "scan\n", 5);
 256         close(fd);
 257
 258         fd = open("/sys/kernel/debug/kmemleak", O_RDONLY);
 259         if (fd < 0)
 260                 return;
 261         if (sendfile(1, fd, NULL, 0x7ffff000) > 0)
 262                 panic("Memory leaks encountered");
 263         close(fd);
 264 }
 265
 266 int main(int argc, char *argv[])
 267 {
 268         ensure_console();
 269         print_banner();
 270         mount_filesystems();
 271         seed_rng();
 272         set_time();
 273         kmod_selftests();
 274         enable_logging();
 275         clear_leaks();
 276         launch_tests();
 277         check_leaks();
 278         poweroff();
 279         return 1;
 280 }