diff options
Diffstat (limited to 'usr.sbin/efiwake/efiwake.c')
| -rw-r--r-- | usr.sbin/efiwake/efiwake.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/usr.sbin/efiwake/efiwake.c b/usr.sbin/efiwake/efiwake.c new file mode 100644 index 000000000000..41ffdea60068 --- /dev/null +++ b/usr.sbin/efiwake/efiwake.c @@ -0,0 +1,140 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2023 Johannes Totz + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/efiio.h> +#include <err.h> +#include <errno.h> +#include <fcntl.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sysexits.h> +#include <unistd.h> + +static void +usage(void) +{ + fprintf(stderr, "Usage:\n" + " efiwake -- print out current " + "EFI time and wake time\n" + " efiwake -d -- disable wake time\n" + " efiwake -e yyyy-mm-ddThh:mm:ss -- enable wake time\n" + ); + exit(EX_USAGE); +} + +int +main(int argc, char **argv) +{ + struct efi_tm now; + struct efi_waketime_ioc waketime; + int ch, error, efi_fd; + bool disable = false, enable = false; + + memset(&waketime, 0, sizeof(waketime)); + + while ((ch = getopt(argc, argv, "de:")) != -1) { + switch (ch) { + case 'd': + disable = true; + break; + case 'e': + if (sscanf(optarg, + "%hu-%02hhu-%02hhuT%02hhu:%02hhu:%02hhu", + &waketime.waketime.tm_year, + &waketime.waketime.tm_mon, + &waketime.waketime.tm_mday, + &waketime.waketime.tm_hour, + &waketime.waketime.tm_min, + &waketime.waketime.tm_sec) != 6) { + usage(); + } + enable = true; + break; + case '?': + default: + usage(); + } + } + argc -= optind; + argv += optind; + + if (argc > 0) + usage(); + if (disable && enable) + usage(); + + efi_fd = open("/dev/efi", O_RDWR); + if (efi_fd < 0) + err(EX_OSERR, "cannot open /dev/efi"); + + error = ioctl(efi_fd, EFIIOC_GET_TIME, &now); + if (error != 0) + err(EX_OSERR, "cannot get EFI time"); + + /* EFI's time can be different from kernel's time. */ + printf("Current EFI time: %u-%02u-%02uT%02u:%02u:%02u\n", + now.tm_year, now.tm_mon, now.tm_mday, now.tm_hour, now.tm_min, + now.tm_sec); + + if (disable) { + /* + * It's tempting to preserve the current timer value. + * However, wonky EFI implementations sometimes return bogus + * dates for the wake timer and would then fail disabling it + * here. + * A safe timer value is the current EFI time. + */ + waketime.waketime = now; + waketime.enabled = 0; + error = ioctl(efi_fd, EFIIOC_SET_WAKETIME, &waketime); + if (error != 0) + err(EX_OSERR, "cannot disable EFI wake time"); + } + if (enable) { + waketime.enabled = 1; + error = ioctl(efi_fd, EFIIOC_SET_WAKETIME, &waketime); + if (error != 0) + err(EX_OSERR, "cannot enable EFI wake time"); + } + + /* Confirm to user what the wake time has been set to. */ + error = ioctl(efi_fd, EFIIOC_GET_WAKETIME, &waketime); + if (error != 0) + err(EX_OSERR, "cannot get EFI wake time"); + + printf("EFI wake time: %u-%02u-%02uT%02u:%02u:%02u; " + "enabled=%i, pending=%i\n", + waketime.waketime.tm_year, waketime.waketime.tm_mon, + waketime.waketime.tm_mday, waketime.waketime.tm_hour, + waketime.waketime.tm_min, waketime.waketime.tm_sec, + waketime.enabled, waketime.pending); + + close(efi_fd); + return (0); +} |