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/* $OpenBSD: vmboot.c,v 1.2 2016/11/25 22:28:58 reyk Exp $ */
/*
* Copyright (c) 2016 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and 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/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/disklabel.h>
#include <ufs/ffs/fs.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <err.h>
#include "vmd.h"
#include "vmboot.h"
int vmboot_strategy(void *, int, daddr32_t, size_t, void *, size_t *);
off_t vmboot_findopenbsd(struct open_file *, off_t);
void *vmboot_loadfile(struct open_file *, char *, size_t *);
/*
* For ufs.c
*/
struct devsw vmboot_devsw = {
.dv_name = "vmboot",
.dv_strategy = vmboot_strategy,
/* other fields are not needed */
};
struct open_file vmboot_file = {
.f_dev = &vmboot_devsw,
.f_devdata = NULL
};
struct vmboot {
int fd;
off_t partoff;
};
int
vmboot_strategy(void *devdata, int rw,
daddr32_t blk, size_t size, void *buf, size_t *rsize)
{
struct vmboot *vmboot = devdata;
ssize_t rlen;
if (vmboot->fd == -1)
return (EIO);
switch (rw) {
case F_READ:
rlen = pread(vmboot->fd, buf, size,
(blk + vmboot->partoff) * DEV_BSIZE);
if (rlen == -1)
return (errno);
*rsize = (size_t)rlen;
break;
case F_WRITE:
rlen = pwrite(vmboot->fd, buf, size,
(blk + vmboot->partoff) * DEV_BSIZE);
if (rlen == -1)
return (errno);
*rsize = (size_t)rlen;
break;
default:
return (EINVAL);
}
return (0);
}
/*
* Based on findopenbsd() from biosdev.c that was partially written by me.
*/
off_t
vmboot_findopenbsd(struct open_file *f, off_t mbroff)
{
struct dos_mbr mbr;
struct dos_partition *dp;
off_t mbr_eoff = DOSBBSECTOR, nextebr;
int ret, i;
static int maxebr = DOS_MAXEBR;
size_t rsize;
if (!maxebr--) {
log_debug("%s: too many extended partitions", __func__);
return (-1);
}
memset(&mbr, 0, sizeof(mbr));
ret = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
mbroff, sizeof(mbr), &mbr, &rsize);
if (ret != 0 || rsize != sizeof(mbr)) {
log_debug("%s: failed to read MBR", __func__);
return (-1);
}
if (mbr.dmbr_sign != DOSMBR_SIGNATURE) {
log_debug("%s: bad MBR signature", __func__);
return (-1);
}
/* Search for the first OpenBSD partition */
nextebr = 0;
for (i = 0; i < NDOSPART; i++) {
dp = &mbr.dmbr_parts[i];
if (!dp->dp_size)
continue;
if (dp->dp_typ == DOSPTYP_OPENBSD) {
if (dp->dp_start > (dp->dp_start + mbroff))
continue;
return (dp->dp_start + mbroff);
}
if (!nextebr && (dp->dp_typ == DOSPTYP_EXTEND ||
dp->dp_typ == DOSPTYP_EXTENDL)) {
nextebr = dp->dp_start + mbr_eoff;
if (nextebr < dp->dp_start)
nextebr = -1;
if (mbr_eoff == DOSBBSECTOR)
mbr_eoff = dp->dp_start;
}
}
if (nextebr && nextebr != -1) {
mbroff = nextebr;
return (vmboot_findopenbsd(f, mbroff));
}
return (-1);
}
void *
vmboot_loadfile(struct open_file *f, char *file, size_t *size)
{
char *buf = NULL;
struct stat st;
size_t rsize;
int ret;
*size = 0;
if ((ret = ufs_open(file, f)) != 0) {
log_debug("%s: failed to open hd0a:%s", __func__, file);
return (NULL);
}
if ((ret = ufs_stat(f, &st)) != 0) {
log_debug("%s: failed to stat hd0a:%s", __func__, file);
goto done;
}
if ((buf = calloc(1, roundup(st.st_size, DEV_BSIZE))) == NULL) {
log_debug("%s: failed to allocate buffer", __func__);
goto done;
}
if ((ret = ufs_read(f, buf, st.st_size, &rsize)) != 0) {
log_debug("%s: failed to read hd0a:%s", __func__, file);
goto done;
}
*size = st.st_size;
done:
ufs_close(f);
return (buf);
}
FILE *
vmboot_open(int kernel_fd, int disk_fd, void **boot)
{
char file[PATH_MAX];
char *buf = NULL;
struct vmboot vmboot;
size_t size;
FILE *fp = NULL;
*boot = NULL;
/* First open kernel directly if specified by fd */
if (kernel_fd != -1)
return (fdopen(kernel_fd, "r"));
if (disk_fd == -1)
return (NULL);
memset(&vmboot, 0, sizeof(vmboot));
vmboot.fd = disk_fd;
vmboot_file.f_devdata = &vmboot;
/* XXX try and parse hd0a:/etc/boot.conf */
strlcpy(file, VM_DEFAULT_KERNEL, sizeof(file));
if ((vmboot.partoff = vmboot_findopenbsd(&vmboot_file, 0)) == -1) {
log_debug("%s: could not find openbsd partition", __func__);
return (NULL);
}
if ((buf = vmboot_loadfile(&vmboot_file, file, &size)) == NULL)
return (NULL);
*boot = buf;
if ((fp = fmemopen(buf, size, "r")) == NULL) {
log_debug("%s: failed to open memory stream", __func__);
free(buf);
*boot = NULL;
}
return (fp);
}
void
vmboot_close(FILE *fp, void *boot)
{
fclose(fp);
free(boot);
}
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