144196Srnordier/* 2330449Seadler * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3330449Seadler * 4185579Sluigi * Copyright (c) 2008 Luigi Rizzo 544196Srnordier * Copyright (c) 1999 Robert Nordier 644196Srnordier * All rights reserved. 744196Srnordier * 844196Srnordier * Redistribution and use in source and binary forms, with or without 944196Srnordier * modification, are permitted provided that the following conditions 1044196Srnordier * are met: 1144196Srnordier * 1. Redistributions of source code must retain the above copyright 1244196Srnordier * notice, this list of conditions and the following disclaimer. 1344196Srnordier * 2. Redistributions in binary form must reproduce the above copyright 1444196Srnordier * notice, this list of conditions and the following disclaimer in the 1544196Srnordier * documentation and/or other materials provided with the distribution. 1644196Srnordier * 1744196Srnordier * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND 1844196Srnordier * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1944196Srnordier * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 2044196Srnordier * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 2144196Srnordier * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 2244196Srnordier * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 2344196Srnordier * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 2444196Srnordier * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 2544196Srnordier * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 2644196Srnordier * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 2744196Srnordier * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2844196Srnordier */ 2944196Srnordier 30114601Sobrien#include <sys/cdefs.h> 31114601Sobrien__FBSDID("$FreeBSD: stable/11/usr.sbin/boot0cfg/boot0cfg.c 330449 2018-03-05 07:26:05Z eadler $"); 3244196Srnordier 3344196Srnordier#include <sys/param.h> 3444196Srnordier#include <sys/disklabel.h> 35104272Sphk#include <sys/diskmbr.h> 3644196Srnordier#include <sys/stat.h> 3744196Srnordier 3844196Srnordier#include <err.h> 3944196Srnordier#include <errno.h> 4044196Srnordier#include <fcntl.h> 41148036Sphk#include <libgeom.h> 4244196Srnordier#include <paths.h> 4344196Srnordier#include <stdio.h> 4444196Srnordier#include <stdlib.h> 4544196Srnordier#include <string.h> 4644196Srnordier#include <unistd.h> 4744196Srnordier 4844196Srnordier#define MBRSIZE 512 /* master boot record size */ 4944196Srnordier 50185579Sluigi#define OFF_VERSION 0x1b0 /* offset: version number, only boot0version */ 51185579Sluigi#define OFF_SERIAL 0x1b8 /* offset: volume serial number */ 5244196Srnordier#define OFF_PTBL 0x1be /* offset: partition table */ 5344196Srnordier#define OFF_MAGIC 0x1fe /* offset: magic number */ 54185579Sluigi/* 55185579Sluigi * Offsets to the parameters of the 512-byte boot block. 56185579Sluigi * For historical reasons they are set as macros 57185579Sluigi */ 58185579Sluigistruct opt_offsets { 59185579Sluigi int opt; 60185579Sluigi int drive; 61185579Sluigi int flags; 62185579Sluigi int ticks; 63185579Sluigi}; 6444196Srnordier 65227250Sedstatic struct opt_offsets b0_ofs[] = { 66185579Sluigi { 0x0, 0x0, 0x0, 0x0 }, /* no boot block */ 67185579Sluigi { 0x1b9, 0x1ba, 0x1bb, 0x1bc }, /* original block */ 68185579Sluigi { 0x1b5, 0x1b6, 0x1b7, 0x1bc }, /* NT_SERIAL block */ 69185579Sluigi}; 70185579Sluigi 71227250Sedstatic int b0_ver; /* boot block version set by boot0bs */ 72185579Sluigi 73185579Sluigi#define OFF_OPT (b0_ofs[b0_ver].opt) /* default boot option */ 74185579Sluigi#define OFF_DRIVE (b0_ofs[b0_ver].drive) /* setdrv drive */ 75185579Sluigi#define OFF_FLAGS (b0_ofs[b0_ver].flags) /* option flags */ 76185579Sluigi#define OFF_TICKS (b0_ofs[b0_ver].ticks) /* clock ticks */ 77185579Sluigi 78185579Sluigi 7944196Srnordier#define cv2(p) ((p)[0] | (p)[1] << 010) 8044196Srnordier 8144196Srnordier#define mk2(p, x) \ 8244196Srnordier (p)[0] = (u_int8_t)(x), \ 8344196Srnordier (p)[1] = (u_int8_t)((x) >> 010) 8444196Srnordier 8544196Srnordierstatic const struct { 8644196Srnordier const char *tok; 8744196Srnordier int def; 8844196Srnordier} opttbl[] = { 89135249Stegge {"packet", 0}, 9044196Srnordier {"update", 1}, 9144196Srnordier {"setdrv", 0} 9244196Srnordier}; 93317062Saraujostatic const int nopt = nitems(opttbl); 9444196Srnordier 9544196Srnordierstatic const char fmt0[] = "# flag start chs type" 9644196Srnordier " end chs offset size\n"; 9744196Srnordier 9844196Srnordierstatic const char fmt1[] = "%d 0x%02x %4u:%3u:%2u 0x%02x" 9944196Srnordier " %4u:%3u:%2u %10u %10u\n"; 10044196Srnordier 101227297Saestatic int geom_class_available(const char *); 10263092Sjhbstatic int read_mbr(const char *, u_int8_t **, int); 10363092Sjhbstatic void write_mbr(const char *, int, u_int8_t *, int); 10463092Sjhbstatic void display_mbr(u_int8_t *); 10563034Sjhbstatic int boot0version(const u_int8_t *); 10648113Srnordierstatic int boot0bs(const u_int8_t *); 10744196Srnordierstatic void stropt(const char *, int *, int *); 10844196Srnordierstatic int argtoi(const char *, int, int, int); 109185579Sluigistatic int set_bell(u_int8_t *, int, int); 11044196Srnordierstatic void usage(void); 11144196Srnordier 112227250Sedstatic unsigned vol_id[5]; /* 4 plus 1 for flag */ 113185579Sluigi 114227250Sedstatic int v_flag; 11548113Srnordier/* 11648113Srnordier * Boot manager installation/configuration utility. 11748113Srnordier */ 11844196Srnordierint 11944196Srnordiermain(int argc, char *argv[]) 12044196Srnordier{ 12163092Sjhb u_int8_t *mbr, *boot0; 12263092Sjhb int boot0_size, mbr_size; 12387643Smikeh const char *bpath, *fpath; 12487643Smikeh char *disk; 125185579Sluigi int B_flag, o_flag; 12664797Sdwmalone int d_arg, m_arg, s_arg, t_arg; 127185579Sluigi int o_and, o_or, o_e = -1; 12863092Sjhb int up, c; 12944196Srnordier 13044196Srnordier bpath = "/boot/boot0"; 13144196Srnordier fpath = NULL; 13244196Srnordier B_flag = v_flag = o_flag = 0; 13364797Sdwmalone d_arg = m_arg = s_arg = t_arg = -1; 13444196Srnordier o_and = 0xff; 13544196Srnordier o_or = 0; 136185579Sluigi while ((c = getopt(argc, argv, "Bvb:d:e:f:i:m:o:s:t:")) != -1) 13744196Srnordier switch (c) { 13844196Srnordier case 'B': 13944196Srnordier B_flag = 1; 14044196Srnordier break; 14144196Srnordier case 'v': 14244196Srnordier v_flag = 1; 14344196Srnordier break; 14444196Srnordier case 'b': 14544196Srnordier bpath = optarg; 14644196Srnordier break; 14744196Srnordier case 'd': 14844196Srnordier d_arg = argtoi(optarg, 0, 0xff, 'd'); 14944196Srnordier break; 150185579Sluigi case 'e': 151185579Sluigi if (optarg[0] == '0' && optarg[1] == 'x') 152185579Sluigi sscanf(optarg, "0x%02x", &o_e); 153185579Sluigi else 154185579Sluigi o_e = optarg[0]; 155185579Sluigi break; 15644196Srnordier case 'f': 15744196Srnordier fpath = optarg; 15844196Srnordier break; 159185579Sluigi case 'i': 160185579Sluigi if (sscanf(optarg, "%02x%02x-%02x%02x", 161185579Sluigi vol_id, vol_id+1, vol_id+2, vol_id+3) == 4) 162185579Sluigi vol_id[4] = 1; 163185579Sluigi else 164185579Sluigi errx(1, "bad argument %s", optarg); 165185579Sluigi break; 16648038Srnordier case 'm': 16748038Srnordier m_arg = argtoi(optarg, 0, 0xf, 'm'); 16848038Srnordier break; 16944196Srnordier case 'o': 17044196Srnordier stropt(optarg, &o_and, &o_or); 17144196Srnordier o_flag = 1; 17244196Srnordier break; 17364797Sdwmalone case 's': 174228738Sjhb if (strcasecmp(optarg, "pxe") == 0) 175228738Sjhb s_arg = 6; 176228738Sjhb else 177228738Sjhb s_arg = argtoi(optarg, 1, 6, 's'); 17864797Sdwmalone break; 17944196Srnordier case 't': 18044196Srnordier t_arg = argtoi(optarg, 1, 0xffff, 't'); 18144196Srnordier break; 18244196Srnordier default: 18344196Srnordier usage(); 18444196Srnordier } 18544196Srnordier argc -= optind; 18644196Srnordier argv += optind; 18744196Srnordier if (argc != 1) 18844196Srnordier usage(); 189182844Slulf disk = g_device_path(*argv); 190182844Slulf if (disk == NULL) 191182844Slulf errx(1, "Unable to get providername for %s\n", *argv); 19264797Sdwmalone up = B_flag || d_arg != -1 || m_arg != -1 || o_flag || s_arg != -1 19364797Sdwmalone || t_arg != -1; 19463092Sjhb 195185579Sluigi /* open the disk and read in the existing mbr. Either here or 196185579Sluigi * when reading the block from disk, we do check for the version 197185579Sluigi * and abort if a suitable block is not found. 198185579Sluigi */ 19963092Sjhb mbr_size = read_mbr(disk, &mbr, !B_flag); 20063092Sjhb 20163092Sjhb /* save the existing MBR if we are asked to do so */ 20263092Sjhb if (fpath) 20363092Sjhb write_mbr(fpath, O_CREAT | O_TRUNC, mbr, mbr_size); 20463092Sjhb 20563092Sjhb /* 20663092Sjhb * If we are installing the boot loader, read it from disk and copy the 20763092Sjhb * slice table over from the existing MBR. If not, then point boot0 20863092Sjhb * back at the MBR we just read in. After this, boot0 is the data to 20963092Sjhb * write back to disk if we are going to do a write. 21063092Sjhb */ 21144196Srnordier if (B_flag) { 21263092Sjhb boot0_size = read_mbr(bpath, &boot0, 1); 21363092Sjhb memcpy(boot0 + OFF_PTBL, mbr + OFF_PTBL, 21463092Sjhb sizeof(struct dos_partition) * NDOSPART); 215185579Sluigi if (b0_ver == 2) /* volume serial number support */ 216185579Sluigi memcpy(boot0 + OFF_SERIAL, mbr + OFF_SERIAL, 4); 21763092Sjhb } else { 21863092Sjhb boot0 = mbr; 21963092Sjhb boot0_size = mbr_size; 22044196Srnordier } 22163092Sjhb 22263092Sjhb /* set the drive */ 22344297Srnordier if (d_arg != -1) 22463034Sjhb boot0[OFF_DRIVE] = d_arg; 22563092Sjhb 22663092Sjhb /* set various flags */ 22748038Srnordier if (m_arg != -1) { 22863034Sjhb boot0[OFF_FLAGS] &= 0xf0; 22963034Sjhb boot0[OFF_FLAGS] |= m_arg; 23048038Srnordier } 23144196Srnordier if (o_flag) { 23263034Sjhb boot0[OFF_FLAGS] &= o_and; 23363034Sjhb boot0[OFF_FLAGS] |= o_or; 23444196Srnordier } 23563092Sjhb 23664797Sdwmalone /* set the default boot selection */ 23764797Sdwmalone if (s_arg != -1) 23864797Sdwmalone boot0[OFF_OPT] = s_arg - 1; 23964797Sdwmalone 24063092Sjhb /* set the timeout */ 24144196Srnordier if (t_arg != -1) 24263034Sjhb mk2(boot0 + OFF_TICKS, t_arg); 24363092Sjhb 244185579Sluigi /* set the bell char */ 245185579Sluigi if (o_e != -1 && set_bell(boot0, o_e, 0) != -1) 246185579Sluigi up = 1; 247185579Sluigi 248185579Sluigi if (vol_id[4]) { 249185579Sluigi if (b0_ver != 2) 250185579Sluigi errx(1, "incompatible boot block, cannot set volume ID"); 251185579Sluigi boot0[OFF_SERIAL] = vol_id[0]; 252185579Sluigi boot0[OFF_SERIAL+1] = vol_id[1]; 253185579Sluigi boot0[OFF_SERIAL+2] = vol_id[2]; 254185579Sluigi boot0[OFF_SERIAL+3] = vol_id[3]; 255185579Sluigi up = 1; /* force update */ 256185579Sluigi } 25763092Sjhb /* write the MBR back to disk */ 25863092Sjhb if (up) 25963092Sjhb write_mbr(disk, 0, boot0, boot0_size); 26063092Sjhb 26163092Sjhb /* display the MBR */ 26263092Sjhb if (v_flag) 26363092Sjhb display_mbr(boot0); 26463092Sjhb 26563092Sjhb /* clean up */ 26663092Sjhb if (mbr != boot0) 26763092Sjhb free(boot0); 26863092Sjhb free(mbr); 26987643Smikeh free(disk); 27063092Sjhb 27163092Sjhb return 0; 27263092Sjhb} 27363092Sjhb 274185579Sluigi/* get or set the 'bell' character to be used in case of errors. 275185579Sluigi * Lookup for a certain code sequence, return -1 if not found. 276185579Sluigi */ 277185579Sluigistatic int 278185579Sluigiset_bell(u_int8_t *mbr, int new_bell, int report) 279185579Sluigi{ 280185579Sluigi /* lookup sequence: 0x100 means skip, 0x200 means done */ 281185579Sluigi static unsigned seq[] = 282185579Sluigi { 0xb0, 0x100, 0xe8, 0x100, 0x100, 0x30, 0xe4, 0x200 }; 283185579Sluigi int ofs, i, c; 284185579Sluigi for (ofs = 0x60; ofs < 0x180; ofs++) { /* search range */ 285185579Sluigi if (mbr[ofs] != seq[0]) /* search initial pattern */ 286185579Sluigi continue; 287185579Sluigi for (i=0;; i++) { 288185579Sluigi if (seq[i] == 0x200) { /* found */ 289185579Sluigi c = mbr[ofs+1]; 290185579Sluigi if (!report) 291185579Sluigi mbr[ofs+1] = c = new_bell; 292185579Sluigi else 293185579Sluigi printf(" bell=%c (0x%x)", 294185579Sluigi (c >= ' ' && c < 0x7f) ? c : ' ', c); 295185579Sluigi return c; 296185579Sluigi } 297185579Sluigi if (seq[i] != 0x100 && seq[i] != mbr[ofs+i]) 298185579Sluigi break; 299185579Sluigi } 300185579Sluigi } 301185579Sluigi warn("bell not found"); 302185579Sluigi return -1; 303185579Sluigi} 30463092Sjhb/* 30563092Sjhb * Read in the MBR of the disk. If it is boot0, then use the version to 30663092Sjhb * read in all of it if necessary. Use pointers to return a malloc'd 30763092Sjhb * buffer containing the MBR and then return its size. 30863092Sjhb */ 30963092Sjhbstatic int 31063092Sjhbread_mbr(const char *disk, u_int8_t **mbr, int check_version) 31163092Sjhb{ 31263092Sjhb u_int8_t buf[MBRSIZE]; 31363092Sjhb int mbr_size, fd; 314185579Sluigi int ver; 31563092Sjhb ssize_t n; 31663092Sjhb 31763092Sjhb if ((fd = open(disk, O_RDONLY)) == -1) 318108394Sphk err(1, "open %s", disk); 31963092Sjhb if ((n = read(fd, buf, MBRSIZE)) == -1) 320108394Sphk err(1, "read %s", disk); 32163092Sjhb if (n != MBRSIZE) 32263092Sjhb errx(1, "%s: short read", disk); 32363092Sjhb if (cv2(buf + OFF_MAGIC) != 0xaa55) 32463092Sjhb errx(1, "%s: bad magic", disk); 32563092Sjhb 326185579Sluigi if (! (ver = boot0bs(buf))) { 32763092Sjhb if (check_version) 32863092Sjhb errx(1, "%s: unknown or incompatible boot code", disk); 32963092Sjhb } else if (boot0version(buf) == 0x101) { 33063092Sjhb mbr_size = 1024; 33163092Sjhb if ((*mbr = malloc(mbr_size)) == NULL) 33263092Sjhb errx(1, "%s: unable to allocate read buffer", disk); 33363092Sjhb if (lseek(fd, 0, SEEK_SET) == -1 || 33463092Sjhb (n = read(fd, *mbr, mbr_size)) == -1) 33563092Sjhb err(1, "%s", disk); 33663092Sjhb if (n != mbr_size) 33763092Sjhb errx(1, "%s: short read", disk); 338227876Skevlo close(fd); 33963092Sjhb return (mbr_size); 34044196Srnordier } 341293977Sjhb if ((*mbr = malloc(sizeof(buf))) == NULL) 342292410Sjhb errx(1, "%s: unable to allocate MBR buffer", disk); 34363092Sjhb memcpy(*mbr, buf, sizeof(buf)); 344227876Skevlo close(fd); 34563092Sjhb 34663092Sjhb return sizeof(buf); 34763092Sjhb} 34863092Sjhb 349227297Saestatic int 350227297Saegeom_class_available(const char *name) 351227297Sae{ 352227297Sae struct gclass *class; 353227297Sae struct gmesh mesh; 354227297Sae int error; 355227297Sae 356227297Sae error = geom_gettree(&mesh); 357227297Sae if (error != 0) 358227297Sae errc(1, error, "Cannot get GEOM tree"); 359227297Sae 360227297Sae LIST_FOREACH(class, &mesh.lg_class, lg_class) { 361227297Sae if (strcmp(class->lg_name, name) == 0) { 362227297Sae geom_deletetree(&mesh); 363227297Sae return (1); 364227297Sae } 365227297Sae } 366227297Sae 367227297Sae geom_deletetree(&mesh); 368227297Sae return (0); 369227297Sae} 370227297Sae 37163092Sjhb/* 37263092Sjhb * Write out the mbr to the specified file. 37363092Sjhb */ 37463092Sjhbstatic void 37563092Sjhbwrite_mbr(const char *fname, int flags, u_int8_t *mbr, int mbr_size) 37663092Sjhb{ 377227297Sae struct gctl_req *grq; 378227297Sae const char *errmsg; 379227297Sae char *pname; 380227297Sae ssize_t n; 381227297Sae int fd; 382148036Sphk 383227297Sae fd = open(fname, O_WRONLY | flags, 0666); 384227297Sae if (fd != -1) { 385227297Sae n = write(fd, mbr, mbr_size); 386227297Sae close(fd); 387227297Sae if (n != mbr_size) 388227297Sae errx(1, "%s: short write", fname); 389227297Sae return; 390227297Sae } 391189273Smarcel 392227297Sae /* 393227297Sae * If we're called to write to a backup file, don't try to 394227297Sae * write through GEOM. 395227297Sae */ 396227297Sae if (flags != 0) 397227297Sae err(1, "can't open file %s to write backup", fname); 398189273Smarcel 399227297Sae /* Try open it read only. */ 400227297Sae fd = open(fname, O_RDONLY); 401227297Sae if (fd == -1) { 402227297Sae warn("error opening %s", fname); 403227297Sae return; 404227297Sae } 405189273Smarcel 406227297Sae pname = g_providername(fd); 407227297Sae if (pname == NULL) { 408227297Sae warn("error getting providername for %s", fname); 409227297Sae return; 410227297Sae } 411227297Sae 412227297Sae /* First check that GEOM_PART is available */ 413227297Sae if (geom_class_available("PART") != 0) { 414227297Sae grq = gctl_get_handle(); 415227297Sae gctl_ro_param(grq, "class", -1, "PART"); 416227297Sae gctl_ro_param(grq, "arg0", -1, pname); 417227297Sae gctl_ro_param(grq, "verb", -1, "bootcode"); 418227297Sae gctl_ro_param(grq, "bootcode", mbr_size, mbr); 419227297Sae gctl_ro_param(grq, "flags", -1, "C"); 420227297Sae errmsg = gctl_issue(grq); 421227297Sae if (errmsg != NULL && errmsg[0] != '\0') 422227297Sae errx(1, "GEOM_PART: write bootcode to %s failed: %s", 423227297Sae fname, errmsg); 424227297Sae gctl_free(grq); 425227297Sae } else if (geom_class_available("MBR") != 0) { 426227297Sae grq = gctl_get_handle(); 427227297Sae gctl_ro_param(grq, "verb", -1, "write MBR"); 428227297Sae gctl_ro_param(grq, "class", -1, "MBR"); 429227297Sae gctl_ro_param(grq, "geom", -1, pname); 430227297Sae gctl_ro_param(grq, "data", mbr_size, mbr); 431227297Sae errmsg = gctl_issue(grq); 432227297Sae if (errmsg != NULL) 433227297Sae err(1, "GEOM_MBR: write MBR to %s failed", fname); 434227297Sae gctl_free(grq); 435227297Sae } else 436227297Sae errx(1, "can't write MBR to %s", fname); 437227297Sae free(pname); 43863092Sjhb} 43963092Sjhb 44063092Sjhb/* 44163092Sjhb * Outputs an informative dump of the data in the MBR to stdout. 44263092Sjhb */ 44363092Sjhbstatic void 44463092Sjhbdisplay_mbr(u_int8_t *mbr) 44563092Sjhb{ 44663092Sjhb struct dos_partition *part; 44763092Sjhb int i, version; 44863092Sjhb 44963092Sjhb part = (struct dos_partition *)(mbr + DOSPARTOFF); 45063092Sjhb printf(fmt0); 45163092Sjhb for (i = 0; i < NDOSPART; i++) 45263092Sjhb if (part[i].dp_typ) 45363092Sjhb printf(fmt1, 1 + i, part[i].dp_flag, 45463092Sjhb part[i].dp_scyl + ((part[i].dp_ssect & 0xc0) << 2), 45563092Sjhb part[i].dp_shd, part[i].dp_ssect & 0x3f, part[i].dp_typ, 45663092Sjhb part[i].dp_ecyl + ((part[i].dp_esect & 0xc0) << 2), 45763092Sjhb part[i].dp_ehd, part[i].dp_esect & 0x3f, part[i].dp_start, 45863092Sjhb part[i].dp_size); 45963092Sjhb printf("\n"); 46063092Sjhb version = boot0version(mbr); 461185579Sluigi printf("version=%d.%d drive=0x%x mask=0x%x ticks=%u", 46263092Sjhb version >> 8, version & 0xff, mbr[OFF_DRIVE], 46363092Sjhb mbr[OFF_FLAGS] & 0xf, cv2(mbr + OFF_TICKS)); 464185579Sluigi set_bell(mbr, 0, 1); 465185579Sluigi printf("\noptions="); 46663092Sjhb for (i = 0; i < nopt; i++) { 46763092Sjhb if (i) 46863092Sjhb printf(","); 46963092Sjhb if (!(mbr[OFF_FLAGS] & 1 << (7 - i)) ^ opttbl[i].def) 47063092Sjhb printf("no"); 47163092Sjhb printf("%s", opttbl[i].tok); 47244196Srnordier } 47363092Sjhb printf("\n"); 474185579Sluigi if (b0_ver == 2) 475185579Sluigi printf("volume serial ID %02x%02x-%02x%02x\n", 476185579Sluigi mbr[OFF_SERIAL], mbr[OFF_SERIAL+1], 477185579Sluigi mbr[OFF_SERIAL+2], mbr[OFF_SERIAL+3]); 47864797Sdwmalone printf("default_selection=F%d (", mbr[OFF_OPT] + 1); 47964797Sdwmalone if (mbr[OFF_OPT] < 4) 48064797Sdwmalone printf("Slice %d", mbr[OFF_OPT] + 1); 481228738Sjhb else if (mbr[OFF_OPT] == 4) 482228738Sjhb printf("Drive 1"); 48364797Sdwmalone else 484228738Sjhb printf("PXE"); 48564797Sdwmalone printf(")\n"); 48644196Srnordier} 48744196Srnordier 48848113Srnordier/* 48963034Sjhb * Return the boot0 version with the minor revision in the low byte, and 49063034Sjhb * the major revision in the next higher byte. 49163034Sjhb */ 49263034Sjhbstatic int 49363034Sjhbboot0version(const u_int8_t *bs) 49463034Sjhb{ 49563034Sjhb /* Check for old version, and return 0x100 if found. */ 496185579Sluigi int v = boot0bs(bs); 497185579Sluigi if (v != 0) 498185579Sluigi return v << 8; 49963034Sjhb 50063034Sjhb /* We have a newer boot0, so extract the version number and return it. */ 50187643Smikeh return *(const int *)(bs + OFF_VERSION) & 0xffff; 50263034Sjhb} 50363034Sjhb 504185579Sluigi/* descriptor of a pattern to match. 505185579Sluigi * Start from the first entry trying to match the chunk of bytes, 506185579Sluigi * if you hit an entry with len=0 terminate the search and report 507185579Sluigi * off as the version. Otherwise skip to the next block after len=0 508185579Sluigi * An entry with len=0, off=0 is the end marker. 509185579Sluigi */ 510185579Sluigistruct byte_pattern { 511185579Sluigi unsigned off; 512185579Sluigi unsigned len; 513185579Sluigi u_int8_t *key; 514185579Sluigi}; 515185579Sluigi 51663034Sjhb/* 51748113Srnordier * Decide if we have valid boot0 boot code by looking for 51848113Srnordier * characteristic byte sequences at fixed offsets. 51948113Srnordier */ 52048113Srnordierstatic int 52148113Srnordierboot0bs(const u_int8_t *bs) 52248113Srnordier{ 523185579Sluigi /* the initial code sequence */ 52463034Sjhb static u_int8_t id0[] = {0xfc, 0x31, 0xc0, 0x8e, 0xc0, 0x8e, 0xd8, 52563034Sjhb 0x8e, 0xd0, 0xbc, 0x00, 0x7c }; 526185579Sluigi /* the drive id */ 52748113Srnordier static u_int8_t id1[] = {'D', 'r', 'i', 'v', 'e', ' '}; 528185579Sluigi static struct byte_pattern patterns[] = { 52963034Sjhb {0x0, sizeof(id0), id0}, 530185579Sluigi {0x1b2, sizeof(id1), id1}, 531185579Sluigi {1, 0, NULL}, 532185579Sluigi {0x0, sizeof(id0), id0}, /* version with NT support */ 533185579Sluigi {0x1ae, sizeof(id1), id1}, 534185579Sluigi {2, 0, NULL}, 535185579Sluigi {0, 0, NULL}, 53648113Srnordier }; 537185579Sluigi struct byte_pattern *p = patterns; 53848113Srnordier 539185579Sluigi for (; p->off || p->len; p++) { 540185579Sluigi if (p->len == 0) 541185579Sluigi break; 542185579Sluigi if (!memcmp(bs + p->off, p->key, p->len)) /* match */ 543185579Sluigi continue; 544185579Sluigi while (p->len) /* skip to next block */ 545185579Sluigi p++; 546185579Sluigi } 547185579Sluigi b0_ver = p->off; /* XXX ugly side effect */ 548185579Sluigi return p->off; 549129302Sstefanf} 55048113Srnordier 55148113Srnordier/* 55248113Srnordier * Adjust "and" and "or" masks for a -o option argument. 55348113Srnordier */ 55444196Srnordierstatic void 55544196Srnordierstropt(const char *arg, int *xa, int *xo) 55644196Srnordier{ 55744196Srnordier const char *q; 55844196Srnordier char *s, *s1; 55944196Srnordier int inv, i, x; 56044196Srnordier 56144196Srnordier if (!(s = strdup(arg))) 56244196Srnordier err(1, NULL); 56344196Srnordier for (s1 = s; (q = strtok(s1, ",")); s1 = NULL) { 56444196Srnordier if ((inv = !strncmp(q, "no", 2))) 56544196Srnordier q += 2; 56644196Srnordier for (i = 0; i < nopt; i++) 56744196Srnordier if (!strcmp(q, opttbl[i].tok)) 56844196Srnordier break; 56944196Srnordier if (i == nopt) 57044196Srnordier errx(1, "%s: Unknown -o option", q); 57144196Srnordier if (opttbl[i].def) 57244196Srnordier inv ^= 1; 57344196Srnordier x = 1 << (7 - i); 57444196Srnordier if (inv) 57544196Srnordier *xa &= ~x; 57644196Srnordier else 57744196Srnordier *xo |= x; 57844196Srnordier } 57944196Srnordier free(s); 58044196Srnordier} 58144196Srnordier 58248113Srnordier/* 58348113Srnordier * Convert and check an option argument. 58448113Srnordier */ 58544196Srnordierstatic int 58644196Srnordierargtoi(const char *arg, int lo, int hi, int opt) 58744196Srnordier{ 58844196Srnordier char *s; 58944196Srnordier long x; 59044196Srnordier 59144196Srnordier errno = 0; 59244196Srnordier x = strtol(arg, &s, 0); 59344196Srnordier if (errno || !*arg || *s || x < lo || x > hi) 59444196Srnordier errx(1, "%s: Bad argument to -%c option", arg, opt); 59544196Srnordier return x; 59644196Srnordier} 59744196Srnordier 59848113Srnordier/* 59948113Srnordier * Display usage information. 60048113Srnordier */ 60144196Srnordierstatic void 60244196Srnordierusage(void) 60344196Srnordier{ 60444196Srnordier fprintf(stderr, "%s\n%s\n", 60548038Srnordier "usage: boot0cfg [-Bv] [-b boot0] [-d drive] [-f file] [-m mask]", 60674668Siedowse " [-o options] [-s slice] [-t ticks] disk"); 60744196Srnordier exit(1); 60844196Srnordier} 609