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fdisk_mbr_enc.c
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Editing: fdisk.c
/* * Mach Operating System * Copyright (c) 1992 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/disk.h> #include <sys/disklabel.h> #include <sys/diskmbr.h> #include <sys/endian.h> #include <sys/param.h> #include <sys/stat.h> #include <sys/mount.h> #include <ctype.h> #include <fcntl.h> #include <err.h> #include <errno.h> #include <libgeom.h> #include <paths.h> #include <regex.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include "fdisk_mbr_enc.h" static int iotest; #define NO_DISK_SECTORS ((u_int32_t)-1) #define NO_TRACK_CYLINDERS 1023 #define NO_TRACK_HEADS 255 #define NO_TRACK_SECTORS 63 #define LBUF 100 static char lbuf[LBUF]; /* * * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992 * * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University * Copyright (c) 1989 Robert. V. Baron * Created. */ #define Decimal(str, ans, tmp, maxval) if (decimal(str, &tmp, ans, maxval)) ans = tmp #define MAX_SEC_SIZE 65536 /* maximum sector size that is supported */ #define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ static int secsize = 0; /* the sensed sector size */ static char *disk; static int cyls, sectors, heads, cylsecs; static u_int32_t disksecs; struct mboot { unsigned char *bootinst; /* boot code */ off_t bootinst_size; struct dos_partition parts[NDOSPART]; }; static struct mboot mboot; static int fd; #define ACTIVE 0x80 static uint dos_cyls; static uint dos_heads; static uint dos_sectors; static uint dos_cylsecs; #define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0)) #define DOSCYL(c) (c & 0xff) #define MAX_ARGS 10 static int current_line_number; static int geom_processed = 0; static int part_processed = 0; static int active_processed = 0; typedef struct cmd { char cmd; int n_args; struct arg { char argtype; unsigned long arg_val; char * arg_str; } args[MAX_ARGS]; } CMD; static int B_flag = 0; /* replace boot code */ static int I_flag = 0; /* use entire disk for FreeBSD */ static int a_flag = 0; /* set active partition */ static char *b_flag = NULL; /* path to boot code */ static int i_flag = 0; /* replace partition data */ static int q_flag = 0; /* Be quiet */ static int u_flag = 0; /* update partition data */ static int s_flag = 0; /* Print a summary and exit */ static int t_flag = 0; /* test only */ static char *f_flag = NULL; /* Read config info from file */ static int v_flag = 0; /* Be verbose */ static int print_config_flag = 0; /* * A list of partition types, probably outdated. */ static const char *const part_types[256] = { [0x00] = "unused", [0x01] = "Primary DOS with 12 bit FAT", [0x02] = "XENIX / file system", [0x03] = "XENIX /usr file system", [0x04] = "Primary DOS with 16 bit FAT (< 32MB)", [0x05] = "Extended DOS", [0x06] = "Primary DOS, 16 bit FAT (>= 32MB)", [0x07] = "NTFS, OS/2 HPFS, QNX-2 (16 bit) or Advanced UNIX", [0x08] = "AIX file system or SplitDrive", [0x09] = "AIX boot partition or Coherent", [0x0A] = "OS/2 Boot Manager, OPUS or Coherent swap", [0x0B] = "DOS or Windows 95 with 32 bit FAT", [0x0C] = "DOS or Windows 95 with 32 bit FAT (LBA)", [0x0E] = "Primary 'big' DOS (>= 32MB, LBA)", [0x0F] = "Extended DOS (LBA)", [0x10] = "OPUS", [0x11] = "OS/2 BM: hidden DOS with 12-bit FAT", [0x12] = "Compaq diagnostics", [0x14] = "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)", [0x16] = "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)", [0x17] = "OS/2 BM: hidden IFS (e.g. HPFS)", [0x18] = "AST Windows swapfile", [0x1b] = "ASUS Recovery partition (NTFS)", [0x24] = "NEC DOS", [0x3C] = "PartitionMagic recovery", [0x39] = "plan9", [0x40] = "VENIX 286", [0x41] = "Linux/MINIX (sharing disk with DRDOS)", [0x42] = "SFS or Linux swap (sharing disk with DRDOS)", [0x43] = "Linux native (sharing disk with DRDOS)", [0x4D] = "QNX 4.2 Primary", [0x4E] = "QNX 4.2 Secondary", [0x4F] = "QNX 4.2 Tertiary", [0x50] = "DM (disk manager)", [0x51] = "DM6 Aux1 (or Novell)", [0x52] = "CP/M or Microport SysV/AT", [0x53] = "DM6 Aux3", [0x54] = "DM6", [0x55] = "EZ-Drive (disk manager)", [0x56] = "Golden Bow (disk manager)", [0x5c] = "Priam Edisk (disk manager)", /* according to S. Widlake */ [0x61] = "SpeedStor", [0x63] = "System V/386 (such as ISC UNIX), GNU HURD or Mach", [0x64] = "Novell Netware/286 2.xx", [0x65] = "Novell Netware/386 3.xx", [0x6C] = "DragonFlyBSD", [0x70] = "DiskSecure Multi-Boot", [0x75] = "PCIX", [0x77] = "QNX4.x", [0x78] = "QNX4.x 2nd part", [0x79] = "QNX4.x 3rd part", [0x80] = "Minix until 1.4a", [0x81] = "Minix since 1.4b, early Linux partition or Mitac disk manager", [0x82] = "Linux swap or Solaris x86", [0x83] = "Linux native", [0x84] = "OS/2 hidden C: drive", [0x85] = "Linux extended", [0x86] = "NTFS volume set??", [0x87] = "NTFS volume set??", [0x93] = "Amoeba file system", [0x94] = "Amoeba bad block table", [0x9F] = "BSD/OS", [0xA0] = "Suspend to Disk", [0xA5] = "FreeBSD/NetBSD/386BSD", [0xA6] = "OpenBSD", [0xA7] = "NeXTSTEP", [0xA9] = "NetBSD", [0xAC] = "IBM JFS", [0xAF] = "HFS+", [0xB7] = "BSDI BSD/386 file system", [0xB8] = "BSDI BSD/386 swap", [0xBE] = "Solaris x86 boot", [0xBF] = "Solaris x86 (new)", [0xC1] = "DRDOS/sec with 12-bit FAT", [0xC4] = "DRDOS/sec with 16-bit FAT (< 32MB)", [0xC6] = "DRDOS/sec with 16-bit FAT (>= 32MB)", [0xC7] = "Syrinx", [0xDB] = "CP/M, Concurrent CP/M, Concurrent DOS or CTOS", [0xDE] = "DELL Utilities - FAT filesystem", [0xE1] = "DOS access or SpeedStor with 12-bit FAT extended partition", [0xE3] = "DOS R/O or SpeedStor", [0xE4] = "SpeedStor with 16-bit FAT extended partition < 1024 cyl.", [0xEB] = "BeOS file system", [0xEE] = "EFI GPT", [0xEF] = "EFI System Partition", [0xF1] = "SpeedStor", [0xF2] = "DOS 3.3+ Secondary", [0xF4] = "SpeedStor large partition", [0xFB] = "VMware VMFS", [0xFE] = "SpeedStor >1024 cyl. or LANstep", [0xFF] = "Xenix bad blocks table", }; static const char * get_type(int t) { const char *ret; ret = (t >= 0 && t <= 255) ? part_types[t] : NULL; return ret ? ret : "unknown"; } static int geom_class_available(const char *); static void print_s0(void); static void print_part(const struct dos_partition *); static void init_sector0(unsigned long start); static void init_boot(void); static void change_part(int i); static void print_params(void); static void change_active(int which); static void change_code(void); static void get_params_to_use(void); static char *get_rootdisk(void); static void dos(struct dos_partition *partp); static int open_disk(int flag); static ssize_t read_disk(off_t sector, void *buf); static int write_disk(off_t sector, void *buf); static int get_params(void); static int read_s0(void); static int write_s0(void); static int ok(const char *str); static int decimal(const char *str, int *num, int deflt, uint32_t maxval); static int read_config(char *config_file); static void reset_boot(void); static int sanitize_partition(struct dos_partition *); static void usage(void); int main(int argc, char *argv[]) { int c, i; int partition = -1; struct dos_partition *partp; while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1) switch (c) { case 'B': B_flag = 1; break; case 'I': I_flag = 1; break; case 'a': a_flag = 1; break; case 'b': b_flag = optarg; break; case 'f': f_flag = optarg; break; case 'i': i_flag = 1; break; case 'p': print_config_flag = 1; break; case 'q': q_flag = 1; break; case 's': s_flag = 1; break; case 't': t_flag = 1; break; case 'u': u_flag = 1; break; case 'v': v_flag = 1; break; case '1': case '2': case '3': case '4': partition = c - '0'; break; default: usage(); } if (f_flag || i_flag) u_flag = 1; if (t_flag) v_flag = 1; argc -= optind; argv += optind; if (argc == 0) { disk = get_rootdisk(); } else { disk = g_device_path(argv[0]); if (disk == NULL) err(1, "unable to get correct path for %s", argv[0]); } if (open_disk(u_flag) < 0) err(1, "cannot open disk %s", disk); /* (abu)use mboot.bootinst to probe for the sector size */ if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) err(1, "cannot allocate buffer to determine disk sector size"); if (read_disk(0, mboot.bootinst) == -1) errx(1, "could not detect sector size"); free(mboot.bootinst); mboot.bootinst = NULL; if (print_config_flag) { if (read_s0()) err(1, "read_s0"); printf("# %s\n", disk); printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors); for (i = 0; i < NDOSPART; i++) { partp = &mboot.parts[i]; if (partp->dp_start == 0 && partp->dp_size == 0) continue; printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ, (u_long)partp->dp_start, (u_long)partp->dp_size); /* Fill flags for the partition. */ if (partp->dp_flag & 0x80) printf("a %d\n", i + 1); } exit(0); } if (s_flag) { if (read_s0()) err(1, "read_s0"); printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, dos_sectors); printf("Part %11s %11s Type Flags\n", "Start", "Size"); for (i = 0; i < NDOSPART; i++) { partp = &mboot.parts[i]; if (partp->dp_start == 0 && partp->dp_size == 0) continue; printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, (u_long) partp->dp_start, (u_long) partp->dp_size, partp->dp_typ, partp->dp_flag); } exit(0); } printf("******* Working on device %s *******\n",disk); if (I_flag) { read_s0(); reset_boot(); partp = &mboot.parts[0]; partp->dp_typ = DOSPTYP_386BSD; partp->dp_flag = ACTIVE; partp->dp_start = dos_sectors; partp->dp_size = rounddown(disksecs, dos_cylsecs) - dos_sectors; dos(partp); if (v_flag) print_s0(); if (!t_flag) write_s0(); exit(0); } if (f_flag) { if (read_s0() || i_flag) reset_boot(); if (!read_config(f_flag)) exit(1); if (v_flag) print_s0(); if (!t_flag) write_s0(); } else { if(u_flag) get_params_to_use(); else print_params(); if (read_s0()) init_sector0(dos_sectors); printf("Media sector size is %d\n", secsize); printf("Warning: BIOS sector numbering starts with sector 1\n"); printf("Information from DOS bootblock is:\n"); if (partition == -1) for (i = 1; i <= NDOSPART; i++) change_part(i); else change_part(partition); if (u_flag || a_flag) change_active(partition); if (B_flag) change_code(); if (u_flag || a_flag || B_flag) { if (!t_flag) { printf("\nWe haven't changed the partition table yet. "); printf("This is your last chance.\n"); } print_s0(); if (!t_flag) { if (ok("Should we write new partition table?")) write_s0(); } else { printf("\n-t flag specified -- partition table not written.\n"); } } } exit(0); } static void usage() { fprintf(stderr, "%s%s", "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n", " fdisk -f configfile [-itv] [disk]\n"); exit(1); } static void print_s0(void) { int i; print_params(); printf("Information from DOS bootblock is:\n"); for (i = 1; i <= NDOSPART; i++) { printf("%d: ", i); print_part(&mboot.parts[i - 1]); } } static struct dos_partition mtpart; static void print_part(const struct dos_partition *partp) { u_int64_t part_mb; if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { printf("<UNUSED>\n"); return; } /* * Be careful not to overflow. */ part_mb = partp->dp_size; part_mb *= secsize; part_mb /= (1024 * 1024); printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, get_type(partp->dp_typ)); printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", (u_long)partp->dp_start, (u_long)partp->dp_size, (uintmax_t)part_mb, partp->dp_flag, partp->dp_flag == ACTIVE ? " (active)" : ""); printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" ,DPCYL(partp->dp_scyl, partp->dp_ssect) ,partp->dp_shd ,DPSECT(partp->dp_ssect) ,DPCYL(partp->dp_ecyl, partp->dp_esect) ,partp->dp_ehd ,DPSECT(partp->dp_esect)); } static void init_boot(void) { const char *fname; int fdesc, n; struct stat sb; fname = b_flag ? b_flag : "/boot/mbr"; if ((fdesc = open(fname, O_RDONLY)) == -1 || fstat(fdesc, &sb) == -1) err(1, "%s", fname); if (sb.st_size == 0) errx(1, "%s is empty, must not be.", fname); if ((mboot.bootinst_size = sb.st_size) % secsize != 0) errx(1, "%s: length must be a multiple of sector size", fname); if (mboot.bootinst != NULL) free(mboot.bootinst); if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) errx(1, "%s: unable to allocate read buffer", fname); if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || close(fdesc)) err(1, "%s", fname); if (n != mboot.bootinst_size) errx(1, "%s: short read", fname); } static void init_sector0(unsigned long start) { struct dos_partition *partp = &mboot.parts[0]; init_boot(); partp->dp_typ = DOSPTYP_386BSD; partp->dp_flag = ACTIVE; start = roundup(start, dos_sectors); if(start == 0) start = dos_sectors; partp->dp_start = start; partp->dp_size = rounddown(disksecs, dos_cylsecs) - start; dos(partp); } static void change_part(int i) { struct dos_partition *partp = &mboot.parts[i - 1]; printf("The data for partition %d is:\n", i); print_part(partp); if (u_flag && ok("Do you want to change it?")) { int tmp; if (i_flag) { bzero(partp, sizeof (*partp)); if (i == 1) { init_sector0(1); printf("\nThe static data for the slice 1 has been reinitialized to:\n"); print_part(partp); } } do { Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp, 255); Decimal("start", partp->dp_start, tmp, NO_DISK_SECTORS); Decimal("size", partp->dp_size, tmp, NO_DISK_SECTORS); if (!sanitize_partition(partp)) { warnx("ERROR: failed to adjust; setting sysid to 0"); partp->dp_typ = 0; } if (ok("Explicitly specify beg/end address ?")) { int tsec,tcyl,thd; tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); thd = partp->dp_shd; tsec = DPSECT(partp->dp_ssect); Decimal("beginning cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); Decimal("beginning head", thd, tmp, NO_TRACK_HEADS); Decimal("beginning sector", tsec, tmp, NO_TRACK_SECTORS); partp->dp_scyl = DOSCYL(tcyl); partp->dp_ssect = DOSSECT(tsec,tcyl); partp->dp_shd = thd; tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); thd = partp->dp_ehd; tsec = DPSECT(partp->dp_esect); Decimal("ending cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); Decimal("ending head", thd, tmp, NO_TRACK_HEADS); Decimal("ending sector", tsec, tmp, NO_TRACK_SECTORS); partp->dp_ecyl = DOSCYL(tcyl); partp->dp_esect = DOSSECT(tsec,tcyl); partp->dp_ehd = thd; } else dos(partp); print_part(partp); } while (!ok("Are we happy with this entry?")); } } static void print_params() { printf("parameters extracted from in-core disklabel are:\n"); printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" ,cyls,heads,sectors,cylsecs); if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63) printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); printf("parameters to be used for BIOS calculations are:\n"); printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); } static void change_active(int which) { struct dos_partition *partp = &mboot.parts[0]; int active, i, new, tmp; active = -1; for (i = 0; i < NDOSPART; i++) { if ((partp[i].dp_flag & ACTIVE) == 0) continue; printf("Partition %d is marked active\n", i + 1); if (active == -1) active = i + 1; } if (a_flag && which != -1) active = which; else if (active == -1) active = 1; if (!ok("Do you want to change the active partition?")) return; setactive: do { new = active; Decimal("active partition", new, tmp, 0); if (new < 1 || new > 4) { printf("Active partition number must be in range 1-4." " Try again.\n"); goto setactive; } active = new; } while (!ok("Are you happy with this choice")); for (i = 0; i < NDOSPART; i++) partp[i].dp_flag = 0; if (active > 0 && active <= NDOSPART) partp[active-1].dp_flag = ACTIVE; } static void change_code() { if (ok("Do you want to change the boot code?")) init_boot(); } void get_params_to_use() { int tmp; print_params(); if (ok("Do you want to change our idea of what BIOS thinks ?")) { do { Decimal("BIOS's idea of #cylinders", dos_cyls, tmp, 0); Decimal("BIOS's idea of #heads", dos_heads, tmp, 0); Decimal("BIOS's idea of #sectors", dos_sectors, tmp, 0); dos_cylsecs = dos_heads * dos_sectors; print_params(); } while(!ok("Are you happy with this choice")); } } /***********************************************\ * Change real numbers into strange dos numbers * \***********************************************/ static void dos(struct dos_partition *partp) { int cy, sec; u_int32_t end; if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { memcpy(partp, &mtpart, sizeof(*partp)); return; } /* Start c/h/s. */ partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; cy = partp->dp_start / dos_cylsecs; sec = partp->dp_start % dos_sectors + 1; partp->dp_scyl = DOSCYL(cy); partp->dp_ssect = DOSSECT(sec, cy); /* End c/h/s. */ end = partp->dp_start + partp->dp_size - 1; partp->dp_ehd = end % dos_cylsecs / dos_sectors; cy = end / dos_cylsecs; sec = end % dos_sectors + 1; partp->dp_ecyl = DOSCYL(cy); partp->dp_esect = DOSSECT(sec, cy); } static int open_disk(int flag) { int rwmode; /* Write mode if one of these flags are set. */ rwmode = (a_flag || I_flag || B_flag || flag); fd = g_open(disk, rwmode); /* If the mode fails, try read-only if we didn't. */ if (fd == -1 && errno == EPERM && rwmode) fd = g_open(disk, 0); if (fd == -1 && errno == ENXIO) return -2; if (fd == -1) { warnx("can't open device %s", disk); return -1; } if (get_params() == -1) { warnx("can't get disk parameters on %s", disk); return -1; } return fd; } static ssize_t read_disk(off_t sector, void *buf) { lseek(fd, (sector * 512), 0); if (secsize == 0) for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; secsize *= 2) { /* try the read */ int size = read(fd, buf, secsize); if (size == secsize) /* it worked so return */ return secsize; } else return read(fd, buf, secsize); /* we failed to read at any of the sizes */ return -1; } static int geom_class_available(const char *name) { struct gclass *class; struct gmesh mesh; int error; error = geom_gettree(&mesh); if (error != 0) errc(1, error, "Cannot get GEOM tree"); LIST_FOREACH(class, &mesh.lg_class, lg_class) { if (strcmp(class->lg_name, name) == 0) { geom_deletetree(&mesh); return (1); } } geom_deletetree(&mesh); return (0); } static int write_disk(off_t sector, void *buf) { ssize_t wr; /* * Try to write MBR directly. This may help when disk * is not in use. * XXX: hardcoded sectorsize */ wr = pwrite(fd, buf, secsize, (sector * 512)); if (wr == secsize) return (0); if (geom_class_available("PART") != 0) warnx("Failed to write MBR. Try to use gpart(8)."); else warnx("Failed to write sector zero"); return(EINVAL); } static int get_params() { int error; u_int u; off_t o; error = ioctl(fd, DIOCGFWSECTORS, &u); if (error == 0) sectors = dos_sectors = u; else sectors = dos_sectors = 63; error = ioctl(fd, DIOCGFWHEADS, &u); if (error == 0) heads = dos_heads = u; else heads = dos_heads = 255; dos_cylsecs = cylsecs = heads * sectors; disksecs = cyls * heads * sectors; u = g_sectorsize(fd); if (u <= 0) return (-1); o = g_mediasize(fd); if (o < 0) return (-1); if (o / u <= NO_DISK_SECTORS) disksecs = o / u; else disksecs = NO_DISK_SECTORS; cyls = dos_cyls = o / (u * dos_heads * dos_sectors); return (0); } static int read_s0() { int i; mboot.bootinst_size = secsize; if (mboot.bootinst != NULL) free(mboot.bootinst); if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { warnx("unable to allocate buffer to read fdisk " "partition table"); return -1; } if (read_disk(0, mboot.bootinst) == -1) { warnx("can't read fdisk partition table"); return -1; } if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) { warnx("invalid fdisk partition table found"); /* So should we initialize things */ return -1; } for (i = 0; i < NDOSPART; i++) dos_partition_dec( &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], &mboot.parts[i]); return 0; } static int write_s0() { int sector, i; if (iotest) { print_s0(); return 0; } for(i = 0; i < NDOSPART; i++) dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], &mboot.parts[i]); le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) if (write_disk(sector, &mboot.bootinst[sector * secsize]) == -1) { warn("can't write fdisk partition table"); return -1; } return(0); } static int ok(const char *str) { printf("%s [n] ", str); fflush(stdout); if (fgets(lbuf, LBUF, stdin) == NULL) exit(1); lbuf[strlen(lbuf)-1] = 0; if (*lbuf && (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) return 1; else return 0; } static int decimal(const char *str, int *num, int deflt, uint32_t maxval) { long long acc; int c; char *cp; while (1) { acc = 0; printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); fflush(stdout); if (fgets(lbuf, LBUF, stdin) == NULL) exit(1); lbuf[strlen(lbuf)-1] = 0; if (!*lbuf) return 0; cp = lbuf; while ((c = *cp) && (c == ' ' || c == '\t')) cp++; if (!c) return 0; while ((c = *cp++)) { if (c <= '9' && c >= '0') { if (acc <= maxval || maxval == 0) acc = acc * 10 + c - '0'; } else break; } if (c == ' ' || c == '\t') while ((c = *cp) && (c == ' ' || c == '\t')) cp++; if (!c) { if (maxval > 0 && acc > maxval) { acc = maxval; printf("%s exceeds maximum value allowed for " "this field. The value has been reduced " "to %lld\n", lbuf, acc); } *num = acc; return 1; } else printf("%s is an invalid decimal number. Try again.\n", lbuf); } } static void parse_config_line(char *line, CMD *command) { char *cp, *end; cp = line; while (1) { memset(command, 0, sizeof(*command)); while (isspace(*cp)) ++cp; if (*cp == '\0' || *cp == '#') break; command->cmd = *cp++; /* * Parse args */ while (1) { while (isspace(*cp)) ++cp; if (*cp == '\0') break; /* eol */ if (*cp == '#') break; /* found comment */ if (isalpha(*cp)) command->args[command->n_args].argtype = *cp++; end = NULL; command->args[command->n_args].arg_val = strtoul(cp, &end, 0); if (cp == end || (!isspace(*end) && *end != '\0')) { char ch; end = cp; while (!isspace(*end) && *end != '\0') ++end; ch = *end; *end = '\0'; command->args[command->n_args].arg_str = strdup(cp); *end = ch; } else command->args[command->n_args].arg_str = NULL; cp = end; command->n_args++; } break; } } static int process_geometry(CMD *command) { int status = 1, i; while (1) { geom_processed = 1; if (part_processed) { warnx( "ERROR line %d: the geometry specification line must occur before\n\ all partition specifications", current_line_number); status = 0; break; } if (command->n_args != 3) { warnx("ERROR line %d: incorrect number of geometry args", current_line_number); status = 0; break; } dos_cyls = 0; dos_heads = 0; dos_sectors = 0; for (i = 0; i < 3; ++i) { switch (command->args[i].argtype) { case 'c': dos_cyls = command->args[i].arg_val; break; case 'h': dos_heads = command->args[i].arg_val; break; case 's': dos_sectors = command->args[i].arg_val; break; default: warnx( "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", current_line_number, command->args[i].argtype, command->args[i].argtype); status = 0; break; } } if (status == 0) break; dos_cylsecs = dos_heads * dos_sectors; /* * Do sanity checks on parameter values */ if (dos_cyls == 0) { warnx("ERROR line %d: number of cylinders not specified", current_line_number); status = 0; } if (dos_cyls > 1024) { warnx( "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ is dedicated to FreeBSD)", current_line_number, dos_cyls); } if (dos_heads == 0) { warnx("ERROR line %d: number of heads not specified", current_line_number); status = 0; } else if (dos_heads > 256) { warnx("ERROR line %d: number of heads must be within (1-256)", current_line_number); status = 0; } if (dos_sectors == 0) { warnx("ERROR line %d: number of sectors not specified", current_line_number); status = 0; } else if (dos_sectors > 63) { warnx("ERROR line %d: number of sectors must be within (1-63)", current_line_number); status = 0; } break; } return (status); } static u_int32_t str2sectors(const char *str) { char *end; unsigned long val; val = strtoul(str, &end, 0); if (str == end || *end == '\0') { warnx("ERROR line %d: unexpected size: \'%s\'", current_line_number, str); return NO_DISK_SECTORS; } if (*end == 'K') val *= 1024UL / secsize; else if (*end == 'M') val *= 1024UL * 1024UL / secsize; else if (*end == 'G') val *= 1024UL * 1024UL * 1024UL / secsize; else { warnx("ERROR line %d: unexpected modifier: %c " "(not K/M/G)", current_line_number, *end); return NO_DISK_SECTORS; } return val; } static int process_partition(CMD *command) { int status = 0, partition; u_int32_t prev_head_boundary, prev_cyl_boundary; u_int32_t adj_size, max_end; struct dos_partition *partp; while (1) { part_processed = 1; if (command->n_args != 4) { warnx("ERROR line %d: incorrect number of partition args", current_line_number); break; } partition = command->args[0].arg_val; if (partition < 1 || partition > 4) { warnx("ERROR line %d: invalid partition number %d", current_line_number, partition); break; } partp = &mboot.parts[partition - 1]; bzero(partp, sizeof (*partp)); partp->dp_typ = command->args[1].arg_val; if (command->args[2].arg_str != NULL) { if (strcmp(command->args[2].arg_str, "*") == 0) { int i; partp->dp_start = dos_sectors; for (i = 1; i < partition; i++) { struct dos_partition *prev_partp; prev_partp = ((struct dos_partition *) &mboot.parts) + i - 1; if (prev_partp->dp_typ != 0) partp->dp_start = prev_partp->dp_start + prev_partp->dp_size; } if (partp->dp_start % dos_sectors != 0) { prev_head_boundary = rounddown(partp->dp_start, dos_sectors); partp->dp_start = prev_head_boundary + dos_sectors; } } else { partp->dp_start = str2sectors(command->args[2].arg_str); if (partp->dp_start == NO_DISK_SECTORS) break; } } else partp->dp_start = command->args[2].arg_val; if (command->args[3].arg_str != NULL) { if (strcmp(command->args[3].arg_str, "*") == 0) partp->dp_size = rounddown(disksecs, dos_cylsecs) - partp->dp_start; else { partp->dp_size = str2sectors(command->args[3].arg_str); if (partp->dp_size == NO_DISK_SECTORS) break; } prev_cyl_boundary = rounddown(partp->dp_start + partp->dp_size, dos_cylsecs); if (prev_cyl_boundary > partp->dp_start) partp->dp_size = prev_cyl_boundary - partp->dp_start; } else partp->dp_size = command->args[3].arg_val; max_end = partp->dp_start + partp->dp_size; if (partp->dp_typ == 0) { /* * Get out, the partition is marked as unused. */ /* * Insure that it's unused. */ bzero(partp, sizeof(*partp)); status = 1; break; } /* * Adjust start upwards, if necessary, to fall on a head boundary. */ if (partp->dp_start % dos_sectors != 0) { prev_head_boundary = rounddown(partp->dp_start, dos_sectors); if (max_end < dos_sectors || prev_head_boundary > max_end - dos_sectors) { /* * Can't go past end of partition */ warnx( "ERROR line %d: unable to adjust start of partition %d to fall on\n\ a head boundary", current_line_number, partition); break; } warnx( "WARNING: adjusting start offset of partition %d\n\ from %u to %u, to fall on a head boundary", partition, (u_int)partp->dp_start, (u_int)(prev_head_boundary + dos_sectors)); partp->dp_start = prev_head_boundary + dos_sectors; } /* * Adjust size downwards, if necessary, to fall on a cylinder * boundary. */ prev_cyl_boundary = rounddown(partp->dp_start + partp->dp_size, dos_cylsecs); if (prev_cyl_boundary > partp->dp_start) adj_size = prev_cyl_boundary - partp->dp_start; else { warnx( "ERROR: could not adjust partition to start on a head boundary\n\ and end on a cylinder boundary."); return (0); } if (adj_size != partp->dp_size) { warnx( "WARNING: adjusting size of partition %d from %u to %u\n\ to end on a cylinder boundary", partition, (u_int)partp->dp_size, (u_int)adj_size); partp->dp_size = adj_size; } if (partp->dp_size == 0) { warnx("ERROR line %d: size of partition %d is zero", current_line_number, partition); break; } dos(partp); status = 1; break; } return (status); } static int process_active(CMD *command) { int status = 0, partition, i; struct dos_partition *partp; while (1) { active_processed = 1; if (command->n_args != 1) { warnx("ERROR line %d: incorrect number of active args", current_line_number); status = 0; break; } partition = command->args[0].arg_val; if (partition < 1 || partition > 4) { warnx("ERROR line %d: invalid partition number %d", current_line_number, partition); break; } /* * Reset active partition */ partp = mboot.parts; for (i = 0; i < NDOSPART; i++) partp[i].dp_flag = 0; partp[partition-1].dp_flag = ACTIVE; status = 1; break; } return (status); } static int process_line(char *line) { CMD command; int status = 1; while (1) { parse_config_line(line, &command); switch (command.cmd) { case 0: /* * Comment or blank line */ break; case 'g': /* * Set geometry */ status = process_geometry(&command); break; case 'p': status = process_partition(&command); break; case 'a': status = process_active(&command); break; default: status = 0; break; } break; } return (status); } static int read_config(char *config_file) { FILE *fp = NULL; int status = 1; char buf[1010]; while (1) { if (strcmp(config_file, "-") != 0) { /* * We're not reading from stdin */ if ((fp = fopen(config_file, "r")) == NULL) { status = 0; break; } } else { fp = stdin; } current_line_number = 0; while (!feof(fp)) { if (fgets(buf, sizeof(buf), fp) == NULL) break; ++current_line_number; status = process_line(buf); if (status == 0) break; } break; } if (fp) { /* * It doesn't matter if we're reading from stdin, as we've reached EOF */ fclose(fp); } return (status); } static void reset_boot(void) { int i; struct dos_partition *partp; init_boot(); for (i = 0; i < 4; ++i) { partp = &mboot.parts[i]; bzero(partp, sizeof(*partp)); } } static int sanitize_partition(struct dos_partition *partp) { u_int32_t prev_head_boundary, prev_cyl_boundary; u_int32_t max_end, size, start; start = partp->dp_start; size = partp->dp_size; max_end = start + size; /* Only allow a zero size if the partition is being marked unused. */ if (size == 0) { if (start == 0 && partp->dp_typ == 0) return (1); warnx("ERROR: size of partition is zero"); return (0); } /* Return if no adjustment is necessary. */ if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) return (1); if (start == 0) { warnx("WARNING: partition overlaps with partition table"); if (ok("Correct this automatically?")) start = dos_sectors; } if (start % dos_sectors != 0) warnx("WARNING: partition does not start on a head boundary"); if ((start +size) % dos_sectors != 0) warnx("WARNING: partition does not end on a cylinder boundary"); warnx("WARNING: this may confuse the BIOS or some operating systems"); if (!ok("Correct this automatically?")) return (1); /* * Adjust start upwards, if necessary, to fall on a head boundary. */ if (start % dos_sectors != 0) { prev_head_boundary = rounddown(start, dos_sectors); if (max_end < dos_sectors || prev_head_boundary >= max_end - dos_sectors) { /* * Can't go past end of partition */ warnx( "ERROR: unable to adjust start of partition to fall on a head boundary"); return (0); } start = prev_head_boundary + dos_sectors; } /* * Adjust size downwards, if necessary, to fall on a cylinder * boundary. */ prev_cyl_boundary = rounddown(start + size, dos_cylsecs); if (prev_cyl_boundary > start) size = prev_cyl_boundary - start; else { warnx("ERROR: could not adjust partition to start on a head boundary\n\ and end on a cylinder boundary."); return (0); } /* Finally, commit any changes to partp and return. */ if (start != partp->dp_start) { warnx("WARNING: adjusting start offset of partition to %u", (u_int)start); partp->dp_start = start; } if (size != partp->dp_size) { warnx("WARNING: adjusting size of partition to %u", (u_int)size); partp->dp_size = size; } return (1); } /* * Try figuring out the root device's canonical disk name. * The following choices are considered: * /dev/ad0s1a => /dev/ad0 * /dev/da0a => /dev/da0 * /dev/vinum/root => /dev/vinum/root * A ".eli" part is removed if it exists (see geli(8)). * A ".journal" ending is removed if it exists (see gjournal(8)). */ static char * get_rootdisk(void) { struct statfs rootfs; regex_t re; #define NMATCHES 2 regmatch_t rm[NMATCHES]; char dev[PATH_MAX], *s; int rv; if (statfs("/", &rootfs) == -1) err(1, "statfs(\"/\")"); if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]*)([sp][0-9]+)?[a-h]?(\\.journal)?$", REG_EXTENDED)) != 0) errx(1, "regcomp() failed (%d)", rv); strlcpy(dev, rootfs.f_mntfromname, sizeof (dev)); if ((s = strstr(dev, ".eli")) != NULL) memmove(s, s+4, strlen(s + 4) + 1); if ((rv = regexec(&re, dev, NMATCHES, rm, 0)) != 0) errx(1, "mounted root fs resource doesn't match expectations (regexec returned %d)", rv); if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) errx(1, "out of memory"); memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, rm[1].rm_eo - rm[1].rm_so); s[rm[1].rm_eo - rm[1].rm_so] = 0; return s; }
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