diff options
Diffstat (limited to 'sbin/newfs_msdos/mkfs_msdos.c')
-rw-r--r-- | sbin/newfs_msdos/mkfs_msdos.c | 854 |
1 files changed, 854 insertions, 0 deletions
diff --git a/sbin/newfs_msdos/mkfs_msdos.c b/sbin/newfs_msdos/mkfs_msdos.c new file mode 100644 index 0000000..f422270 --- /dev/null +++ b/sbin/newfs_msdos/mkfs_msdos.c @@ -0,0 +1,854 @@ +/* + * Copyright (c) 1998 Robert Nordier + * All rights reserved. + * + * 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(S) ``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(S) 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. + */ + +#ifndef lint +static const char rcsid[] = + "$FreeBSD$"; +#endif /* not lint */ + +#include <sys/param.h> +#include <sys/fdcio.h> +#include <sys/disk.h> +#include <sys/disklabel.h> +#include <sys/mount.h> +#include <sys/stat.h> +#include <sys/time.h> + +#include <ctype.h> +#include <err.h> +#include <errno.h> +#include <fcntl.h> +#include <inttypes.h> +#include <paths.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include <unistd.h> + +#include "mkfs_msdos.h" + +#define MAXU16 0xffff /* maximum unsigned 16-bit quantity */ +#define BPN 4 /* bits per nibble */ +#define NPB 2 /* nibbles per byte */ + +#define DOSMAGIC 0xaa55 /* DOS magic number */ +#define MINBPS 512 /* minimum bytes per sector */ +#define MAXSPC 128 /* maximum sectors per cluster */ +#define MAXNFT 16 /* maximum number of FATs */ +#define DEFBLK 4096 /* default block size */ +#define DEFBLK16 2048 /* default block size FAT16 */ +#define DEFRDE 512 /* default root directory entries */ +#define RESFTE 2 /* reserved FAT entries */ +#define MINCLS12 1U /* minimum FAT12 clusters */ +#define MINCLS16 0xff5U /* minimum FAT16 clusters */ +#define MINCLS32 0xfff5U /* minimum FAT32 clusters */ +#define MAXCLS12 0xff4U /* maximum FAT12 clusters */ +#define MAXCLS16 0xfff4U /* maximum FAT16 clusters */ +#define MAXCLS32 0xffffff4U /* maximum FAT32 clusters */ + +#define mincls(fat) ((fat) == 12 ? MINCLS12 : \ + (fat) == 16 ? MINCLS16 : \ + MINCLS32) + +#define maxcls(fat) ((fat) == 12 ? MAXCLS12 : \ + (fat) == 16 ? MAXCLS16 : \ + MAXCLS32) + +#define mk1(p, x) \ + (p) = (u_int8_t)(x) + +#define mk2(p, x) \ + (p)[0] = (u_int8_t)(x), \ + (p)[1] = (u_int8_t)((x) >> 010) + +#define mk4(p, x) \ + (p)[0] = (u_int8_t)(x), \ + (p)[1] = (u_int8_t)((x) >> 010), \ + (p)[2] = (u_int8_t)((x) >> 020), \ + (p)[3] = (u_int8_t)((x) >> 030) + +struct bs { + u_int8_t bsJump[3]; /* bootstrap entry point */ + u_int8_t bsOemName[8]; /* OEM name and version */ +} __packed; + +struct bsbpb { + u_int8_t bpbBytesPerSec[2]; /* bytes per sector */ + u_int8_t bpbSecPerClust; /* sectors per cluster */ + u_int8_t bpbResSectors[2]; /* reserved sectors */ + u_int8_t bpbFATs; /* number of FATs */ + u_int8_t bpbRootDirEnts[2]; /* root directory entries */ + u_int8_t bpbSectors[2]; /* total sectors */ + u_int8_t bpbMedia; /* media descriptor */ + u_int8_t bpbFATsecs[2]; /* sectors per FAT */ + u_int8_t bpbSecPerTrack[2]; /* sectors per track */ + u_int8_t bpbHeads[2]; /* drive heads */ + u_int8_t bpbHiddenSecs[4]; /* hidden sectors */ + u_int8_t bpbHugeSectors[4]; /* big total sectors */ +} __packed; + +struct bsxbpb { + u_int8_t bpbBigFATsecs[4]; /* big sectors per FAT */ + u_int8_t bpbExtFlags[2]; /* FAT control flags */ + u_int8_t bpbFSVers[2]; /* file system version */ + u_int8_t bpbRootClust[4]; /* root directory start cluster */ + u_int8_t bpbFSInfo[2]; /* file system info sector */ + u_int8_t bpbBackup[2]; /* backup boot sector */ + u_int8_t bpbReserved[12]; /* reserved */ +} __packed; + +struct bsx { + u_int8_t exDriveNumber; /* drive number */ + u_int8_t exReserved1; /* reserved */ + u_int8_t exBootSignature; /* extended boot signature */ + u_int8_t exVolumeID[4]; /* volume ID number */ + u_int8_t exVolumeLabel[11]; /* volume label */ + u_int8_t exFileSysType[8]; /* file system type */ +} __packed; + +struct de { + u_int8_t deName[11]; /* name and extension */ + u_int8_t deAttributes; /* attributes */ + u_int8_t rsvd[10]; /* reserved */ + u_int8_t deMTime[2]; /* last-modified time */ + u_int8_t deMDate[2]; /* last-modified date */ + u_int8_t deStartCluster[2]; /* starting cluster */ + u_int8_t deFileSize[4]; /* size */ +} __packed; + +struct bpb { + u_int bpbBytesPerSec; /* bytes per sector */ + u_int bpbSecPerClust; /* sectors per cluster */ + u_int bpbResSectors; /* reserved sectors */ + u_int bpbFATs; /* number of FATs */ + u_int bpbRootDirEnts; /* root directory entries */ + u_int bpbSectors; /* total sectors */ + u_int bpbMedia; /* media descriptor */ + u_int bpbFATsecs; /* sectors per FAT */ + u_int bpbSecPerTrack; /* sectors per track */ + u_int bpbHeads; /* drive heads */ + u_int bpbHiddenSecs; /* hidden sectors */ + u_int bpbHugeSectors; /* big total sectors */ + u_int bpbBigFATsecs; /* big sectors per FAT */ + u_int bpbRootClust; /* root directory start cluster */ + u_int bpbFSInfo; /* file system info sector */ + u_int bpbBackup; /* backup boot sector */ +}; + +#define BPBGAP 0, 0, 0, 0, 0, 0 + +static struct { + const char *name; + struct bpb bpb; +} const stdfmt[] = { + {"160", {512, 1, 1, 2, 64, 320, 0xfe, 1, 8, 1, BPBGAP}}, + {"180", {512, 1, 1, 2, 64, 360, 0xfc, 2, 9, 1, BPBGAP}}, + {"320", {512, 2, 1, 2, 112, 640, 0xff, 1, 8, 2, BPBGAP}}, + {"360", {512, 2, 1, 2, 112, 720, 0xfd, 2, 9, 2, BPBGAP}}, + {"640", {512, 2, 1, 2, 112, 1280, 0xfb, 2, 8, 2, BPBGAP}}, + {"720", {512, 2, 1, 2, 112, 1440, 0xf9, 3, 9, 2, BPBGAP}}, + {"1200", {512, 1, 1, 2, 224, 2400, 0xf9, 7, 15, 2, BPBGAP}}, + {"1232", {1024,1, 1, 2, 192, 1232, 0xfe, 2, 8, 2, BPBGAP}}, + {"1440", {512, 1, 1, 2, 224, 2880, 0xf0, 9, 18, 2, BPBGAP}}, + {"2880", {512, 2, 1, 2, 240, 5760, 0xf0, 9, 36, 2, BPBGAP}} +}; + +static const u_int8_t bootcode[] = { + 0xfa, /* cli */ + 0x31, 0xc0, /* xor ax,ax */ + 0x8e, 0xd0, /* mov ss,ax */ + 0xbc, 0x00, 0x7c, /* mov sp,7c00h */ + 0xfb, /* sti */ + 0x8e, 0xd8, /* mov ds,ax */ + 0xe8, 0x00, 0x00, /* call $ + 3 */ + 0x5e, /* pop si */ + 0x83, 0xc6, 0x19, /* add si,+19h */ + 0xbb, 0x07, 0x00, /* mov bx,0007h */ + 0xfc, /* cld */ + 0xac, /* lodsb */ + 0x84, 0xc0, /* test al,al */ + 0x74, 0x06, /* jz $ + 8 */ + 0xb4, 0x0e, /* mov ah,0eh */ + 0xcd, 0x10, /* int 10h */ + 0xeb, 0xf5, /* jmp $ - 9 */ + 0x30, 0xe4, /* xor ah,ah */ + 0xcd, 0x16, /* int 16h */ + 0xcd, 0x19, /* int 19h */ + 0x0d, 0x0a, + 'N', 'o', 'n', '-', 's', 'y', 's', 't', + 'e', 'm', ' ', 'd', 'i', 's', 'k', + 0x0d, 0x0a, + 'P', 'r', 'e', 's', 's', ' ', 'a', 'n', + 'y', ' ', 'k', 'e', 'y', ' ', 't', 'o', + ' ', 'r', 'e', 'b', 'o', 'o', 't', + 0x0d, 0x0a, + 0 +}; + +static volatile sig_atomic_t got_siginfo; +static void infohandler(int); + +static void check_mounted(const char *, mode_t); +static void getstdfmt(const char *, struct bpb *); +static void getdiskinfo(int, const char *, const char *, int, + struct bpb *); +static void print_bpb(struct bpb *); +static u_int ckgeom(const char *, u_int, const char *); +static void mklabel(u_int8_t *, const char *); +static int oklabel(const char *); +static void setstr(u_int8_t *, const char *, size_t); + +int mkfs_msdos(const char *fname, const char *dtype, + const struct msdos_options *op) +{ + char buf[MAXPATHLEN]; + struct sigaction si_sa; + struct stat sb; + struct timeval tv; + struct bpb bpb; + struct tm *tm; + struct bs *bs; + struct bsbpb *bsbpb; + struct bsxbpb *bsxbpb; + struct bsx *bsx; + struct de *de; + u_int8_t *img; + const char *bname; + ssize_t n; + time_t now; + u_int fat, bss, rds, cls, dir, lsn, x, x1, x2; + int fd, fd1; + struct msdos_options o = *op; + + if (o.OEM_string && strlen(o.OEM_string) > 8) { + errx(1, "%s: bad OEM string", o.OEM_string); + } + if (o.create_size) { + if (o.no_create) + errx(1, "create (-C) is incompatible with -N"); + fd = open(fname, O_RDWR | O_CREAT | O_TRUNC, 0644); + if (fd == -1) + errx(1, "failed to create %s", fname); + if (ftruncate(fd, o.create_size)) + errx(1, "failed to initialize %jd bytes", (intmax_t)o.create_size); + } else if ((fd = open(fname, o.no_create ? O_RDONLY : O_RDWR)) == -1) + err(1, "%s", fname); + if (fstat(fd, &sb)) + err(1, "%s", fname); + if (o.create_size) { + if (!S_ISREG(sb.st_mode)) + warnx("warning, %s is not a regular file", fname); + } else { + if (!S_ISCHR(sb.st_mode)) + warnx("warning, %s is not a character device", fname); + } + if (!o.no_create) + check_mounted(fname, sb.st_mode); + if (o.offset && o.offset != lseek(fd, o.offset, SEEK_SET)) + errx(1, "cannot seek to %jd", (intmax_t)o.offset); + memset(&bpb, 0, sizeof(bpb)); + if (o.floppy) { + getstdfmt(o.floppy, &bpb); + bpb.bpbHugeSectors = bpb.bpbSectors; + bpb.bpbSectors = 0; + bpb.bpbBigFATsecs = bpb.bpbFATsecs; + bpb.bpbFATsecs = 0; + } + if (o.drive_heads) + bpb.bpbHeads = o.drive_heads; + if (o.sectors_per_track) + bpb.bpbSecPerTrack = o.sectors_per_track; + if (o.bytes_per_sector) + bpb.bpbBytesPerSec = o.bytes_per_sector; + if (o.size) + bpb.bpbHugeSectors = o.size; + if (o.hidden_sectors_set) + bpb.bpbHiddenSecs = o.hidden_sectors; + if (!(o.floppy || (o.drive_heads && o.sectors_per_track && o.bytes_per_sector && o.size && o.hidden_sectors_set))) { + off_t delta; + getdiskinfo(fd, fname, dtype, o.hidden_sectors_set, &bpb); + bpb.bpbHugeSectors -= (o.offset / bpb.bpbBytesPerSec); + delta = bpb.bpbHugeSectors % bpb.bpbSecPerTrack; + if (delta != 0) { + warnx("trim %d sectors to adjust to a multiple of %d", + (int)delta, bpb.bpbSecPerTrack); + bpb.bpbHugeSectors -= delta; + } + if (bpb.bpbSecPerClust == 0) { /* set defaults */ + if (bpb.bpbHugeSectors <= 6000) /* about 3MB -> 512 bytes */ + bpb.bpbSecPerClust = 1; + else if (bpb.bpbHugeSectors <= (1<<17)) /* 64M -> 4k */ + bpb.bpbSecPerClust = 8; + else if (bpb.bpbHugeSectors <= (1<<19)) /* 256M -> 8k */ + bpb.bpbSecPerClust = 16; + else if (bpb.bpbHugeSectors <= (1<<21)) /* 1G -> 16k */ + bpb.bpbSecPerClust = 32; + else + bpb.bpbSecPerClust = 64; /* otherwise 32k */ + } + } + if (!powerof2(bpb.bpbBytesPerSec)) + errx(1, "bytes/sector (%u) is not a power of 2", bpb.bpbBytesPerSec); + if (bpb.bpbBytesPerSec < MINBPS) + errx(1, "bytes/sector (%u) is too small; minimum is %u", + bpb.bpbBytesPerSec, MINBPS); + if (o.volume_label && !oklabel(o.volume_label)) + errx(1, "%s: bad volume label", o.volume_label); + if (!(fat = o.fat_type)) { + if (o.floppy) + fat = 12; + else if (!o.directory_entries && (o.info_sector || o.backup_sector)) + fat = 32; + } + if ((fat == 32 && o.directory_entries) || (fat != 32 && (o.info_sector || o.backup_sector))) + errx(1, "-%c is not a legal FAT%s option", + fat == 32 ? 'e' : o.info_sector ? 'i' : 'k', + fat == 32 ? "32" : "12/16"); + if (o.floppy && fat == 32) + bpb.bpbRootDirEnts = 0; + if (fat != 0 && fat != 12 && fat != 16 && fat != 32) { + errx(1, "%d: bad FAT type", fat); + } + + if (o.block_size) { + if (!powerof2(o.block_size)) + errx(1, "block size (%u) is not a power of 2", o.block_size); + if (o.block_size < bpb.bpbBytesPerSec) + errx(1, "block size (%u) is too small; minimum is %u", + o.block_size, bpb.bpbBytesPerSec); + if (o.block_size > bpb.bpbBytesPerSec * MAXSPC) + errx(1, "block size (%u) is too large; maximum is %u", + o.block_size, bpb.bpbBytesPerSec * MAXSPC); + bpb.bpbSecPerClust = o.block_size / bpb.bpbBytesPerSec; + } + if (o.sectors_per_cluster) { + if (!powerof2(o.sectors_per_cluster)) + errx(1, "sectors/cluster (%u) is not a power of 2", o.sectors_per_cluster); + bpb.bpbSecPerClust = o.sectors_per_cluster; + } + if (o.reserved_sectors) + bpb.bpbResSectors = o.reserved_sectors; + if (o.num_FAT) { + if (o.num_FAT > MAXNFT) + errx(1, "number of FATs (%u) is too large; maximum is %u", + o.num_FAT, MAXNFT); + bpb.bpbFATs = o.num_FAT; + } + if (o.directory_entries) + bpb.bpbRootDirEnts = o.directory_entries; + if (o.media_descriptor_set) { + if (o.media_descriptor < 0xf0) + errx(1, "illegal media descriptor (%#x)", o.media_descriptor); + bpb.bpbMedia = o.media_descriptor; + } + if (o.sectors_per_fat) + bpb.bpbBigFATsecs = o.sectors_per_fat; + if (o.info_sector) + bpb.bpbFSInfo = o.info_sector; + if (o.backup_sector) + bpb.bpbBackup = o.backup_sector; + bss = 1; + bname = NULL; + fd1 = -1; + if (o.bootstrap) { + bname = o.bootstrap; + if (!strchr(bname, '/')) { + snprintf(buf, sizeof(buf), "/boot/%s", bname); + if (!(bname = strdup(buf))) + err(1, NULL); + } + if ((fd1 = open(bname, O_RDONLY)) == -1 || fstat(fd1, &sb)) + err(1, "%s", bname); + if (!S_ISREG(sb.st_mode) || sb.st_size % bpb.bpbBytesPerSec || + sb.st_size < bpb.bpbBytesPerSec || + sb.st_size > bpb.bpbBytesPerSec * MAXU16) + errx(1, "%s: inappropriate file type or format", bname); + bss = sb.st_size / bpb.bpbBytesPerSec; + } + if (!bpb.bpbFATs) + bpb.bpbFATs = 2; + if (!fat) { + if (bpb.bpbHugeSectors < (bpb.bpbResSectors ? bpb.bpbResSectors : bss) + + howmany((RESFTE + (bpb.bpbSecPerClust ? MINCLS16 : MAXCLS12 + 1)) * + (bpb.bpbSecPerClust ? 16 : 12) / BPN, + bpb.bpbBytesPerSec * NPB) * + bpb.bpbFATs + + howmany(bpb.bpbRootDirEnts ? bpb.bpbRootDirEnts : DEFRDE, + bpb.bpbBytesPerSec / sizeof(struct de)) + + (bpb.bpbSecPerClust ? MINCLS16 : MAXCLS12 + 1) * + (bpb.bpbSecPerClust ? bpb.bpbSecPerClust : + howmany(DEFBLK, bpb.bpbBytesPerSec))) + fat = 12; + else if (bpb.bpbRootDirEnts || bpb.bpbHugeSectors < + (bpb.bpbResSectors ? bpb.bpbResSectors : bss) + + howmany((RESFTE + MAXCLS16) * 2, bpb.bpbBytesPerSec) * + bpb.bpbFATs + + howmany(DEFRDE, bpb.bpbBytesPerSec / sizeof(struct de)) + + (MAXCLS16 + 1) * + (bpb.bpbSecPerClust ? bpb.bpbSecPerClust : + howmany(8192, bpb.bpbBytesPerSec))) + fat = 16; + else + fat = 32; + } + x = bss; + if (fat == 32) { + if (!bpb.bpbFSInfo) { + if (x == MAXU16 || x == bpb.bpbBackup) + errx(1, "no room for info sector"); + bpb.bpbFSInfo = x; + } + if (bpb.bpbFSInfo != MAXU16 && x <= bpb.bpbFSInfo) + x = bpb.bpbFSInfo + 1; + if (!bpb.bpbBackup) { + if (x == MAXU16) + errx(1, "no room for backup sector"); + bpb.bpbBackup = x; + } else if (bpb.bpbBackup != MAXU16 && bpb.bpbBackup == bpb.bpbFSInfo) + errx(1, "backup sector would overwrite info sector"); + if (bpb.bpbBackup != MAXU16 && x <= bpb.bpbBackup) + x = bpb.bpbBackup + 1; + } + if (!bpb.bpbResSectors) + bpb.bpbResSectors = fat == 32 ? + MAX(x, MAX(16384 / bpb.bpbBytesPerSec, 4)) : x; + else if (bpb.bpbResSectors < x) + errx(1, "too few reserved sectors (need %d have %d)", x, + bpb.bpbResSectors); + if (fat != 32 && !bpb.bpbRootDirEnts) + bpb.bpbRootDirEnts = DEFRDE; + rds = howmany(bpb.bpbRootDirEnts, bpb.bpbBytesPerSec / sizeof(struct de)); + if (!bpb.bpbSecPerClust) + for (bpb.bpbSecPerClust = howmany(fat == 16 ? DEFBLK16 : + DEFBLK, bpb.bpbBytesPerSec); + bpb.bpbSecPerClust < MAXSPC && + bpb.bpbResSectors + + howmany((RESFTE + maxcls(fat)) * (fat / BPN), + bpb.bpbBytesPerSec * NPB) * + bpb.bpbFATs + + rds + + (u_int64_t) (maxcls(fat) + 1) * + bpb.bpbSecPerClust <= bpb.bpbHugeSectors; + bpb.bpbSecPerClust <<= 1) + continue; + if (fat != 32 && bpb.bpbBigFATsecs > MAXU16) + errx(1, "too many sectors/FAT for FAT12/16"); + x1 = bpb.bpbResSectors + rds; + x = bpb.bpbBigFATsecs ? bpb.bpbBigFATsecs : 1; + if (x1 + (u_int64_t)x * bpb.bpbFATs > bpb.bpbHugeSectors) + errx(1, "meta data exceeds file system size"); + x1 += x * bpb.bpbFATs; + x = (u_int64_t)(bpb.bpbHugeSectors - x1) * bpb.bpbBytesPerSec * NPB / + (bpb.bpbSecPerClust * bpb.bpbBytesPerSec * NPB + fat / + BPN * bpb.bpbFATs); + x2 = howmany((RESFTE + MIN(x, maxcls(fat))) * (fat / BPN), + bpb.bpbBytesPerSec * NPB); + if (!bpb.bpbBigFATsecs) { + bpb.bpbBigFATsecs = x2; + x1 += (bpb.bpbBigFATsecs - 1) * bpb.bpbFATs; + } + cls = (bpb.bpbHugeSectors - x1) / bpb.bpbSecPerClust; + x = (u_int64_t)bpb.bpbBigFATsecs * bpb.bpbBytesPerSec * NPB / (fat / BPN) - + RESFTE; + if (cls > x) + cls = x; + if (bpb.bpbBigFATsecs < x2) + warnx("warning: sectors/FAT limits file system to %u clusters", + cls); + if (cls < mincls(fat)) + errx(1, "%u clusters too few clusters for FAT%u, need %u", cls, fat, + mincls(fat)); + if (cls > maxcls(fat)) { + cls = maxcls(fat); + bpb.bpbHugeSectors = x1 + (cls + 1) * bpb.bpbSecPerClust - 1; + warnx("warning: FAT type limits file system to %u sectors", + bpb.bpbHugeSectors); + } + printf("%s: %u sector%s in %u FAT%u cluster%s " + "(%u bytes/cluster)\n", fname, cls * bpb.bpbSecPerClust, + cls * bpb.bpbSecPerClust == 1 ? "" : "s", cls, fat, + cls == 1 ? "" : "s", bpb.bpbBytesPerSec * bpb.bpbSecPerClust); + if (!bpb.bpbMedia) + bpb.bpbMedia = !bpb.bpbHiddenSecs ? 0xf0 : 0xf8; + if (fat == 32) + bpb.bpbRootClust = RESFTE; + if (bpb.bpbHiddenSecs + bpb.bpbHugeSectors <= MAXU16) { + bpb.bpbSectors = bpb.bpbHugeSectors; + bpb.bpbHugeSectors = 0; + } + if (fat != 32) { + bpb.bpbFATsecs = bpb.bpbBigFATsecs; + bpb.bpbBigFATsecs = 0; + } + print_bpb(&bpb); + if (!o.no_create) { + gettimeofday(&tv, NULL); + now = tv.tv_sec; + tm = localtime(&now); + if (!(img = malloc(bpb.bpbBytesPerSec))) + err(1, NULL); + dir = bpb.bpbResSectors + (bpb.bpbFATsecs ? bpb.bpbFATsecs : + bpb.bpbBigFATsecs) * bpb.bpbFATs; + memset(&si_sa, 0, sizeof(si_sa)); + si_sa.sa_handler = infohandler; + if (sigaction(SIGINFO, &si_sa, NULL) == -1) + err(1, "sigaction SIGINFO"); + for (lsn = 0; lsn < dir + (fat == 32 ? bpb.bpbSecPerClust : rds); lsn++) { + if (got_siginfo) { + fprintf(stderr,"%s: writing sector %u of %u (%u%%)\n", + fname, lsn, + (dir + (fat == 32 ? bpb.bpbSecPerClust: rds)), + (lsn * 100) / (dir + + (fat == 32 ? bpb.bpbSecPerClust: rds))); + got_siginfo = 0; + } + x = lsn; + if (o.bootstrap && + fat == 32 && bpb.bpbBackup != MAXU16 && + bss <= bpb.bpbBackup && x >= bpb.bpbBackup) { + x -= bpb.bpbBackup; + if (!x && lseek(fd1, o.offset, SEEK_SET)) + err(1, "%s", bname); + } + if (o.bootstrap && x < bss) { + if ((n = read(fd1, img, bpb.bpbBytesPerSec)) == -1) + err(1, "%s", bname); + if ((unsigned)n != bpb.bpbBytesPerSec) + errx(1, "%s: can't read sector %u", bname, x); + } else + memset(img, 0, bpb.bpbBytesPerSec); + if (!lsn || + (fat == 32 && bpb.bpbBackup != MAXU16 && + lsn == bpb.bpbBackup)) { + x1 = sizeof(struct bs); + bsbpb = (struct bsbpb *)(img + x1); + mk2(bsbpb->bpbBytesPerSec, bpb.bpbBytesPerSec); + mk1(bsbpb->bpbSecPerClust, bpb.bpbSecPerClust); + mk2(bsbpb->bpbResSectors, bpb.bpbResSectors); + mk1(bsbpb->bpbFATs, bpb.bpbFATs); + mk2(bsbpb->bpbRootDirEnts, bpb.bpbRootDirEnts); + mk2(bsbpb->bpbSectors, bpb.bpbSectors); + mk1(bsbpb->bpbMedia, bpb.bpbMedia); + mk2(bsbpb->bpbFATsecs, bpb.bpbFATsecs); + mk2(bsbpb->bpbSecPerTrack, bpb.bpbSecPerTrack); + mk2(bsbpb->bpbHeads, bpb.bpbHeads); + mk4(bsbpb->bpbHiddenSecs, bpb.bpbHiddenSecs); + mk4(bsbpb->bpbHugeSectors, bpb.bpbHugeSectors); + x1 += sizeof(struct bsbpb); + if (fat == 32) { + bsxbpb = (struct bsxbpb *)(img + x1); + mk4(bsxbpb->bpbBigFATsecs, bpb.bpbBigFATsecs); + mk2(bsxbpb->bpbExtFlags, 0); + mk2(bsxbpb->bpbFSVers, 0); + mk4(bsxbpb->bpbRootClust, bpb.bpbRootClust); + mk2(bsxbpb->bpbFSInfo, bpb.bpbFSInfo); + mk2(bsxbpb->bpbBackup, bpb.bpbBackup); + x1 += sizeof(struct bsxbpb); + } + bsx = (struct bsx *)(img + x1); + mk1(bsx->exBootSignature, 0x29); + if (o.volume_id_set) + x = o.volume_id; + else + x = (((u_int)(1 + tm->tm_mon) << 8 | + (u_int)tm->tm_mday) + + ((u_int)tm->tm_sec << 8 | + (u_int)(tv.tv_usec / 10))) << 16 | + ((u_int)(1900 + tm->tm_year) + + ((u_int)tm->tm_hour << 8 | + (u_int)tm->tm_min)); + mk4(bsx->exVolumeID, x); + mklabel(bsx->exVolumeLabel, o.volume_label ? o.volume_label : "NO NAME"); + sprintf(buf, "FAT%u", fat); + setstr(bsx->exFileSysType, buf, sizeof(bsx->exFileSysType)); + if (!o.bootstrap) { + x1 += sizeof(struct bsx); + bs = (struct bs *)img; + mk1(bs->bsJump[0], 0xeb); + mk1(bs->bsJump[1], x1 - 2); + mk1(bs->bsJump[2], 0x90); + setstr(bs->bsOemName, o.OEM_string ? o.OEM_string : "BSD4.4 ", + sizeof(bs->bsOemName)); + memcpy(img + x1, bootcode, sizeof(bootcode)); + mk2(img + MINBPS - 2, DOSMAGIC); + } + } else if (fat == 32 && bpb.bpbFSInfo != MAXU16 && + (lsn == bpb.bpbFSInfo || + (bpb.bpbBackup != MAXU16 && + lsn == bpb.bpbBackup + bpb.bpbFSInfo))) { + mk4(img, 0x41615252); + mk4(img + MINBPS - 28, 0x61417272); + mk4(img + MINBPS - 24, 0xffffffff); + mk4(img + MINBPS - 20, bpb.bpbRootClust); + mk2(img + MINBPS - 2, DOSMAGIC); + } else if (lsn >= bpb.bpbResSectors && lsn < dir && + !((lsn - bpb.bpbResSectors) % + (bpb.bpbFATsecs ? bpb.bpbFATsecs : + bpb.bpbBigFATsecs))) { + mk1(img[0], bpb.bpbMedia); + for (x = 1; x < fat * (fat == 32 ? 3 : 2) / 8; x++) + mk1(img[x], fat == 32 && x % 4 == 3 ? 0x0f : 0xff); + } else if (lsn == dir && o.volume_label) { + de = (struct de *)img; + mklabel(de->deName, o.volume_label); + mk1(de->deAttributes, 050); + x = (u_int)tm->tm_hour << 11 | + (u_int)tm->tm_min << 5 | + (u_int)tm->tm_sec >> 1; + mk2(de->deMTime, x); + x = (u_int)(tm->tm_year - 80) << 9 | + (u_int)(tm->tm_mon + 1) << 5 | + (u_int)tm->tm_mday; + mk2(de->deMDate, x); + } + if ((n = write(fd, img, bpb.bpbBytesPerSec)) == -1) + err(1, "%s", fname); + if ((unsigned)n != bpb.bpbBytesPerSec) + errx(1, "%s: can't write sector %u", fname, lsn); + } + } + return 0; +} + +/* + * Exit with error if file system is mounted. + */ +static void +check_mounted(const char *fname, mode_t mode) +{ + struct statfs *mp; + const char *s1, *s2; + size_t len; + int n, r; + + if (!(n = getmntinfo(&mp, MNT_NOWAIT))) + err(1, "getmntinfo"); + len = strlen(_PATH_DEV); + s1 = fname; + if (!strncmp(s1, _PATH_DEV, len)) + s1 += len; + r = S_ISCHR(mode) && s1 != fname && *s1 == 'r'; + for (; n--; mp++) { + s2 = mp->f_mntfromname; + if (!strncmp(s2, _PATH_DEV, len)) + s2 += len; + if ((r && s2 != mp->f_mntfromname && !strcmp(s1 + 1, s2)) || + !strcmp(s1, s2)) + errx(1, "%s is mounted on %s", fname, mp->f_mntonname); + } +} + +/* + * Get a standard format. + */ +static void +getstdfmt(const char *fmt, struct bpb *bpb) +{ + u_int x, i; + + x = sizeof(stdfmt) / sizeof(stdfmt[0]); + for (i = 0; i < x && strcmp(fmt, stdfmt[i].name); i++); + if (i == x) + errx(1, "%s: unknown standard format", fmt); + *bpb = stdfmt[i].bpb; +} + +/* + * Get disk slice, partition, and geometry information. + */ +static void +getdiskinfo(int fd, const char *fname, const char *dtype, __unused int oflag, + struct bpb *bpb) +{ + struct disklabel *lp, dlp; + struct fd_type type; + off_t ms, hs = 0; + + lp = NULL; + + /* If the user specified a disk type, try to use that */ + if (dtype != NULL) { + lp = getdiskbyname(dtype); + } + + /* Maybe it's a floppy drive */ + if (lp == NULL) { + if (ioctl(fd, DIOCGMEDIASIZE, &ms) == -1) { + struct stat st; + + if (fstat(fd, &st)) + err(1, "cannot get disk size"); + /* create a fake geometry for a file image */ + ms = st.st_size; + dlp.d_secsize = 512; + dlp.d_nsectors = 63; + dlp.d_ntracks = 255; + dlp.d_secperunit = ms / dlp.d_secsize; + lp = &dlp; + } else if (ioctl(fd, FD_GTYPE, &type) != -1) { + dlp.d_secsize = 128 << type.secsize; + dlp.d_nsectors = type.sectrac; + dlp.d_ntracks = type.heads; + dlp.d_secperunit = ms / dlp.d_secsize; + lp = &dlp; + } + } + + /* Maybe it's a fixed drive */ + if (lp == NULL) { + if (bpb->bpbBytesPerSec) + dlp.d_secsize = bpb->bpbBytesPerSec; + if (bpb->bpbBytesPerSec == 0 && ioctl(fd, DIOCGSECTORSIZE, + &dlp.d_secsize) == -1) + err(1, "cannot get sector size"); + + dlp.d_secperunit = ms / dlp.d_secsize; + + if (bpb->bpbSecPerTrack == 0 && ioctl(fd, DIOCGFWSECTORS, + &dlp.d_nsectors) == -1) { + warn("cannot get number of sectors per track"); + dlp.d_nsectors = 63; + } + if (bpb->bpbHeads == 0 && + ioctl(fd, DIOCGFWHEADS, &dlp.d_ntracks) == -1) { + warn("cannot get number of heads"); + if (dlp.d_secperunit <= 63*1*1024) + dlp.d_ntracks = 1; + else if (dlp.d_secperunit <= 63*16*1024) + dlp.d_ntracks = 16; + else + dlp.d_ntracks = 255; + } + + hs = (ms / dlp.d_secsize) - dlp.d_secperunit; + lp = &dlp; + } + + if (bpb->bpbBytesPerSec == 0) + bpb->bpbBytesPerSec = ckgeom(fname, lp->d_secsize, "bytes/sector"); + if (bpb->bpbSecPerTrack == 0) + bpb->bpbSecPerTrack = ckgeom(fname, lp->d_nsectors, "sectors/track"); + if (bpb->bpbHeads == 0) + bpb->bpbHeads = ckgeom(fname, lp->d_ntracks, "drive heads"); + if (bpb->bpbHugeSectors == 0) + bpb->bpbHugeSectors = lp->d_secperunit; + if (bpb->bpbHiddenSecs == 0) + bpb->bpbHiddenSecs = hs; +} + +/* + * Print out BPB values. + */ +static void +print_bpb(struct bpb *bpb) +{ + printf("BytesPerSec=%u SecPerClust=%u ResSectors=%u FATs=%u", + bpb->bpbBytesPerSec, bpb->bpbSecPerClust, bpb->bpbResSectors, + bpb->bpbFATs); + if (bpb->bpbRootDirEnts) + printf(" RootDirEnts=%u", bpb->bpbRootDirEnts); + if (bpb->bpbSectors) + printf(" Sectors=%u", bpb->bpbSectors); + printf(" Media=%#x", bpb->bpbMedia); + if (bpb->bpbFATsecs) + printf(" FATsecs=%u", bpb->bpbFATsecs); + printf(" SecPerTrack=%u Heads=%u HiddenSecs=%u", bpb->bpbSecPerTrack, + bpb->bpbHeads, bpb->bpbHiddenSecs); + if (bpb->bpbHugeSectors) + printf(" HugeSectors=%u", bpb->bpbHugeSectors); + if (!bpb->bpbFATsecs) { + printf(" FATsecs=%u RootCluster=%u", bpb->bpbBigFATsecs, + bpb->bpbRootClust); + printf(" FSInfo="); + printf(bpb->bpbFSInfo == MAXU16 ? "%#x" : "%u", bpb->bpbFSInfo); + printf(" Backup="); + printf(bpb->bpbBackup == MAXU16 ? "%#x" : "%u", bpb->bpbBackup); + } + printf("\n"); +} + +/* + * Check a disk geometry value. + */ +static u_int +ckgeom(const char *fname, u_int val, const char *msg) +{ + if (!val) + errx(1, "%s: no default %s", fname, msg); + if (val > MAXU16) + errx(1, "%s: illegal %s %d", fname, msg, val); + return val; +} + +/* + * Check a volume label. + */ +static int +oklabel(const char *src) +{ + int c, i; + + for (i = 0; i <= 11; i++) { + c = (u_char)*src++; + if (c < ' ' + !i || strchr("\"*+,./:;<=>?[\\]|", c)) + break; + } + return i && !c; +} + +/* + * Make a volume label. + */ +static void +mklabel(u_int8_t *dest, const char *src) +{ + int c, i; + + for (i = 0; i < 11; i++) { + c = *src ? toupper(*src++) : ' '; + *dest++ = !i && c == '\xe5' ? 5 : c; + } +} + +/* + * Copy string, padding with spaces. + */ +static void +setstr(u_int8_t *dest, const char *src, size_t len) +{ + while (len--) + *dest++ = *src ? *src++ : ' '; +} + +static void +infohandler(int sig __unused) +{ + + got_siginfo = 1; +} |