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/* $OpenBSD: rdboot.c,v 1.6 2020/05/26 13:30:47 visa Exp $ */
/*
* Copyright (c) 2019-2020 Visa Hankala
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/reboot.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <util.h>
#include <machine/octboot.h>
#include <machine/param.h>
#include "cmd.h"
#include "disk.h"
#define DEVRANDOM "/dev/random"
#define BOOTRANDOM "/etc/random.seed"
#define BOOTRANDOM_MAX 256 /* no point being greater than RC4STATE */
#define KERNEL "/bsd"
int loadrandom(void);
void kexec(void);
struct cmd_state cmd;
int octbootfd = -1;
const char version[] = "1.1";
int
main(void)
{
char rootdev[PATH_MAX];
int fd, hasboot;
fd = open(_PATH_CONSOLE, O_RDWR);
login_tty(fd);
/* Keep stdout unbuffered to mimic ordinary bootblocks. */
setvbuf(stdout, NULL, _IONBF, 0);
printf(">> OpenBSD/" MACHINE " BOOT %s\n", version);
octbootfd = open("/dev/octboot", O_WRONLY);
if (octbootfd == -1)
err(1, "cannot open boot control device");
memset(&cmd, 0, sizeof(cmd));
cmd.boothowto = 0;
cmd.conf = "/etc/boot.conf";
strlcpy(cmd.image, KERNEL, sizeof(cmd.image));
cmd.timeout = 5;
if (ioctl(octbootfd, OBIOC_GETROOTDEV, rootdev) == -1) {
if (errno != ENOENT)
fprintf(stderr, "cannot get rootdev from kernel: %s\n",
strerror(errno));
} else {
snprintf(cmd.bootdev, sizeof(cmd.bootdev), "%s%sa",
rootdev, isduid(rootdev, OPENDEV_PART) ? "." : "");
}
disk_init();
if (upgrade()) {
strlcpy(cmd.image, "/bsd.upgrade", sizeof(cmd.image));
printf("upgrade detected: switching to %s\n", cmd.image);
}
hasboot = read_conf();
for (;;) {
if (hasboot <= 0) {
do {
printf("boot> ");
} while (!getcmd());
}
if (loadrandom() == 0)
cmd.boothowto |= RB_GOODRANDOM;
kexec();
hasboot = 0;
strlcpy(cmd.image, KERNEL, sizeof(cmd.image));
printf("will try %s\n", cmd.image);
}
return 0;
}
int
loadrandom(void)
{
char buf[BOOTRANDOM_MAX];
struct stat sb;
int fd, ret = 0;
/* Read the file from the device specified by the kernel path. */
if (disk_open(cmd.path) == NULL)
return -1;
fd = open(BOOTRANDOM, O_RDONLY);
if (fd == -1) {
fprintf(stderr, "%s: cannot open %s: %s", __func__, BOOTRANDOM,
strerror(errno));
disk_close();
return -1;
}
if (fstat(fd, &sb) == 0) {
if (sb.st_mode & S_ISTXT) {
printf("NOTE: random seed is being reused.\n");
ret = -1;
}
if (read(fd, buf, sizeof(buf)) != sizeof(buf))
ret = -1;
fchmod(fd, sb.st_mode | S_ISTXT);
} else {
ret = -1;
}
close(fd);
disk_close();
/*
* Push the whole buffer to the entropy pool.
* The kernel will use the entropy on kexec().
* It does not matter if some of the buffer content is uninitialized.
*/
fd = open(DEVRANDOM, O_WRONLY);
if (fd == -1) {
fprintf(stderr, "%s: cannot open %s: %s", __func__,
DEVRANDOM, strerror(errno));
return -1;
}
write(fd, buf, sizeof(buf));
close(fd);
return ret;
}
void
kexec(void)
{
struct octboot_kexec_args kargs;
struct stat sb;
char boothowtostr[32];
char rootdev[32];
char *kimg = NULL;
const char *path;
ssize_t n;
off_t pos;
int argc, fd = -1, ret;
path = disk_open(cmd.path);
if (path == NULL)
return;
fd = open(path, O_RDONLY);
if (fd == -1)
goto load_failed;
if (fstat(fd, &sb) == -1)
goto load_failed;
if (!S_ISREG(sb.st_mode) || sb.st_size == 0) {
errno = ENOEXEC;
goto load_failed;
}
kimg = malloc(sb.st_size);
if (kimg == NULL)
goto load_failed;
pos = 0;
while (pos < sb.st_size) {
n = read(fd, kimg + pos, sb.st_size - pos);
if (n == -1)
goto load_failed;
pos += n;
}
close(fd);
disk_close();
memset(&kargs, 0, sizeof(kargs));
kargs.kimg = kimg;
kargs.klen = sb.st_size;
argc = 0;
if (cmd.boothowto != 0) {
snprintf(boothowtostr, sizeof(boothowtostr), "boothowto=%d",
cmd.boothowto);
kargs.argv[argc++] = boothowtostr;
}
if (cmd.hasduid) {
snprintf(rootdev, sizeof(rootdev),
"rootdev=%02x%02x%02x%02x%02x%02x%02x%02x",
cmd.bootduid[0], cmd.bootduid[1],
cmd.bootduid[2], cmd.bootduid[3],
cmd.bootduid[4], cmd.bootduid[5],
cmd.bootduid[6], cmd.bootduid[7]);
kargs.argv[argc++] = rootdev;
}
printf("booting %s\n", cmd.path);
ret = ioctl(octbootfd, OBIOC_KEXEC, &kargs);
if (ret == -1)
fprintf(stderr, "failed to execute kernel %s: %s\n",
cmd.path, strerror(errno));
else
fprintf(stderr, "kexec() returned unexpectedly\n");
free(kimg);
return;
load_failed:
fprintf(stderr, "failed to load kernel %s: %s\n",
cmd.path, strerror(errno));
if (fd != -1)
close(fd);
disk_close();
free(kimg);
}
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