144196Srnordier/* 2185579Sluigi * Copyright (c) 2008 Luigi Rizzo 344196Srnordier * Copyright (c) 1999 Robert Nordier 444196Srnordier * All rights reserved. 544196Srnordier * 644196Srnordier * Redistribution and use in source and binary forms, with or without 744196Srnordier * modification, are permitted provided that the following conditions 844196Srnordier * are met: 944196Srnordier * 1. Redistributions of source code must retain the above copyright 1044196Srnordier * notice, this list of conditions and the following disclaimer. 1144196Srnordier * 2. Redistributions in binary form must reproduce the above copyright 1244196Srnordier * notice, this list of conditions and the following disclaimer in the 1344196Srnordier * documentation and/or other materials provided with the distribution. 1444196Srnordier * 1544196Srnordier * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND 1644196Srnordier * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1744196Srnordier * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 1844196Srnordier * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 1944196Srnordier * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 2044196Srnordier * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 2144196Srnordier * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 2244196Srnordier * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 2344196Srnordier * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 2444196Srnordier * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 2544196Srnordier * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2644196Srnordier */ 2744196Srnordier 28114601Sobrien#include <sys/cdefs.h> 29114601Sobrien__FBSDID("$FreeBSD: releng/10.3/usr.sbin/boot0cfg/boot0cfg.c 294338 2016-01-19 19:04:56Z jhb $"); 3044196Srnordier 3144196Srnordier#include <sys/param.h> 3244196Srnordier#include <sys/disklabel.h> 33104272Sphk#include <sys/diskmbr.h> 3444196Srnordier#include <sys/stat.h> 3544196Srnordier 3644196Srnordier#include <err.h> 3744196Srnordier#include <errno.h> 3844196Srnordier#include <fcntl.h> 39148036Sphk#include <libgeom.h> 4044196Srnordier#include <paths.h> 4144196Srnordier#include <stdio.h> 4244196Srnordier#include <stdlib.h> 4344196Srnordier#include <string.h> 4444196Srnordier#include <unistd.h> 4544196Srnordier 4644196Srnordier#define MBRSIZE 512 /* master boot record size */ 4744196Srnordier 48185579Sluigi#define OFF_VERSION 0x1b0 /* offset: version number, only boot0version */ 49185579Sluigi#define OFF_SERIAL 0x1b8 /* offset: volume serial number */ 5044196Srnordier#define OFF_PTBL 0x1be /* offset: partition table */ 5144196Srnordier#define OFF_MAGIC 0x1fe /* offset: magic number */ 52185579Sluigi/* 53185579Sluigi * Offsets to the parameters of the 512-byte boot block. 54185579Sluigi * For historical reasons they are set as macros 55185579Sluigi */ 56185579Sluigistruct opt_offsets { 57185579Sluigi int opt; 58185579Sluigi int drive; 59185579Sluigi int flags; 60185579Sluigi int ticks; 61185579Sluigi}; 6244196Srnordier 63227250Sedstatic struct opt_offsets b0_ofs[] = { 64185579Sluigi { 0x0, 0x0, 0x0, 0x0 }, /* no boot block */ 65185579Sluigi { 0x1b9, 0x1ba, 0x1bb, 0x1bc }, /* original block */ 66185579Sluigi { 0x1b5, 0x1b6, 0x1b7, 0x1bc }, /* NT_SERIAL block */ 67185579Sluigi}; 68185579Sluigi 69227250Sedstatic int b0_ver; /* boot block version set by boot0bs */ 70185579Sluigi 71185579Sluigi#define OFF_OPT (b0_ofs[b0_ver].opt) /* default boot option */ 72185579Sluigi#define OFF_DRIVE (b0_ofs[b0_ver].drive) /* setdrv drive */ 73185579Sluigi#define OFF_FLAGS (b0_ofs[b0_ver].flags) /* option flags */ 74185579Sluigi#define OFF_TICKS (b0_ofs[b0_ver].ticks) /* clock ticks */ 75185579Sluigi 76185579Sluigi 7744196Srnordier#define cv2(p) ((p)[0] | (p)[1] << 010) 7844196Srnordier 7944196Srnordier#define mk2(p, x) \ 8044196Srnordier (p)[0] = (u_int8_t)(x), \ 8144196Srnordier (p)[1] = (u_int8_t)((x) >> 010) 8244196Srnordier 8344196Srnordierstatic const struct { 8444196Srnordier const char *tok; 8544196Srnordier int def; 8644196Srnordier} opttbl[] = { 87135249Stegge {"packet", 0}, 8844196Srnordier {"update", 1}, 8944196Srnordier {"setdrv", 0} 9044196Srnordier}; 9144196Srnordierstatic const int nopt = sizeof(opttbl) / sizeof(opttbl[0]); 9244196Srnordier 9344196Srnordierstatic const char fmt0[] = "# flag start chs type" 9444196Srnordier " end chs offset size\n"; 9544196Srnordier 9644196Srnordierstatic const char fmt1[] = "%d 0x%02x %4u:%3u:%2u 0x%02x" 9744196Srnordier " %4u:%3u:%2u %10u %10u\n"; 9844196Srnordier 99227297Saestatic int geom_class_available(const char *); 10063092Sjhbstatic int read_mbr(const char *, u_int8_t **, int); 10163092Sjhbstatic void write_mbr(const char *, int, u_int8_t *, int); 10263092Sjhbstatic void display_mbr(u_int8_t *); 10363034Sjhbstatic int boot0version(const u_int8_t *); 10448113Srnordierstatic int boot0bs(const u_int8_t *); 10544196Srnordierstatic void stropt(const char *, int *, int *); 10644196Srnordierstatic int argtoi(const char *, int, int, int); 107185579Sluigistatic int set_bell(u_int8_t *, int, int); 10844196Srnordierstatic void usage(void); 10944196Srnordier 110227250Sedstatic unsigned vol_id[5]; /* 4 plus 1 for flag */ 111185579Sluigi 112227250Sedstatic int v_flag; 11348113Srnordier/* 11448113Srnordier * Boot manager installation/configuration utility. 11548113Srnordier */ 11644196Srnordierint 11744196Srnordiermain(int argc, char *argv[]) 11844196Srnordier{ 11963092Sjhb u_int8_t *mbr, *boot0; 12063092Sjhb int boot0_size, mbr_size; 12187643Smikeh const char *bpath, *fpath; 12287643Smikeh char *disk; 123185579Sluigi int B_flag, o_flag; 12464797Sdwmalone int d_arg, m_arg, s_arg, t_arg; 125185579Sluigi int o_and, o_or, o_e = -1; 12663092Sjhb int up, c; 12744196Srnordier 12844196Srnordier bpath = "/boot/boot0"; 12944196Srnordier fpath = NULL; 13044196Srnordier B_flag = v_flag = o_flag = 0; 13164797Sdwmalone d_arg = m_arg = s_arg = t_arg = -1; 13244196Srnordier o_and = 0xff; 13344196Srnordier o_or = 0; 134185579Sluigi while ((c = getopt(argc, argv, "Bvb:d:e:f:i:m:o:s:t:")) != -1) 13544196Srnordier switch (c) { 13644196Srnordier case 'B': 13744196Srnordier B_flag = 1; 13844196Srnordier break; 13944196Srnordier case 'v': 14044196Srnordier v_flag = 1; 14144196Srnordier break; 14244196Srnordier case 'b': 14344196Srnordier bpath = optarg; 14444196Srnordier break; 14544196Srnordier case 'd': 14644196Srnordier d_arg = argtoi(optarg, 0, 0xff, 'd'); 14744196Srnordier break; 148185579Sluigi case 'e': 149185579Sluigi if (optarg[0] == '0' && optarg[1] == 'x') 150185579Sluigi sscanf(optarg, "0x%02x", &o_e); 151185579Sluigi else 152185579Sluigi o_e = optarg[0]; 153185579Sluigi break; 15444196Srnordier case 'f': 15544196Srnordier fpath = optarg; 15644196Srnordier break; 157185579Sluigi case 'i': 158185579Sluigi if (sscanf(optarg, "%02x%02x-%02x%02x", 159185579Sluigi vol_id, vol_id+1, vol_id+2, vol_id+3) == 4) 160185579Sluigi vol_id[4] = 1; 161185579Sluigi else 162185579Sluigi errx(1, "bad argument %s", optarg); 163185579Sluigi break; 16448038Srnordier case 'm': 16548038Srnordier m_arg = argtoi(optarg, 0, 0xf, 'm'); 16648038Srnordier break; 16744196Srnordier case 'o': 16844196Srnordier stropt(optarg, &o_and, &o_or); 16944196Srnordier o_flag = 1; 17044196Srnordier break; 17164797Sdwmalone case 's': 172228738Sjhb if (strcasecmp(optarg, "pxe") == 0) 173228738Sjhb s_arg = 6; 174228738Sjhb else 175228738Sjhb s_arg = argtoi(optarg, 1, 6, 's'); 17664797Sdwmalone break; 17744196Srnordier case 't': 17844196Srnordier t_arg = argtoi(optarg, 1, 0xffff, 't'); 17944196Srnordier break; 18044196Srnordier default: 18144196Srnordier usage(); 18244196Srnordier } 18344196Srnordier argc -= optind; 18444196Srnordier argv += optind; 18544196Srnordier if (argc != 1) 18644196Srnordier usage(); 187182844Slulf disk = g_device_path(*argv); 188182844Slulf if (disk == NULL) 189182844Slulf errx(1, "Unable to get providername for %s\n", *argv); 19064797Sdwmalone up = B_flag || d_arg != -1 || m_arg != -1 || o_flag || s_arg != -1 19164797Sdwmalone || t_arg != -1; 19263092Sjhb 193185579Sluigi /* open the disk and read in the existing mbr. Either here or 194185579Sluigi * when reading the block from disk, we do check for the version 195185579Sluigi * and abort if a suitable block is not found. 196185579Sluigi */ 19763092Sjhb mbr_size = read_mbr(disk, &mbr, !B_flag); 19863092Sjhb 19963092Sjhb /* save the existing MBR if we are asked to do so */ 20063092Sjhb if (fpath) 20163092Sjhb write_mbr(fpath, O_CREAT | O_TRUNC, mbr, mbr_size); 20263092Sjhb 20363092Sjhb /* 20463092Sjhb * If we are installing the boot loader, read it from disk and copy the 20563092Sjhb * slice table over from the existing MBR. If not, then point boot0 20663092Sjhb * back at the MBR we just read in. After this, boot0 is the data to 20763092Sjhb * write back to disk if we are going to do a write. 20863092Sjhb */ 20944196Srnordier if (B_flag) { 21063092Sjhb boot0_size = read_mbr(bpath, &boot0, 1); 21163092Sjhb memcpy(boot0 + OFF_PTBL, mbr + OFF_PTBL, 21263092Sjhb sizeof(struct dos_partition) * NDOSPART); 213185579Sluigi if (b0_ver == 2) /* volume serial number support */ 214185579Sluigi memcpy(boot0 + OFF_SERIAL, mbr + OFF_SERIAL, 4); 21563092Sjhb } else { 21663092Sjhb boot0 = mbr; 21763092Sjhb boot0_size = mbr_size; 21844196Srnordier } 21963092Sjhb 22063092Sjhb /* set the drive */ 22144297Srnordier if (d_arg != -1) 22263034Sjhb boot0[OFF_DRIVE] = d_arg; 22363092Sjhb 22463092Sjhb /* set various flags */ 22548038Srnordier if (m_arg != -1) { 22663034Sjhb boot0[OFF_FLAGS] &= 0xf0; 22763034Sjhb boot0[OFF_FLAGS] |= m_arg; 22848038Srnordier } 22944196Srnordier if (o_flag) { 23063034Sjhb boot0[OFF_FLAGS] &= o_and; 23163034Sjhb boot0[OFF_FLAGS] |= o_or; 23244196Srnordier } 23363092Sjhb 23464797Sdwmalone /* set the default boot selection */ 23564797Sdwmalone if (s_arg != -1) 23664797Sdwmalone boot0[OFF_OPT] = s_arg - 1; 23764797Sdwmalone 23863092Sjhb /* set the timeout */ 23944196Srnordier if (t_arg != -1) 24063034Sjhb mk2(boot0 + OFF_TICKS, t_arg); 24163092Sjhb 242185579Sluigi /* set the bell char */ 243185579Sluigi if (o_e != -1 && set_bell(boot0, o_e, 0) != -1) 244185579Sluigi up = 1; 245185579Sluigi 246185579Sluigi if (vol_id[4]) { 247185579Sluigi if (b0_ver != 2) 248185579Sluigi errx(1, "incompatible boot block, cannot set volume ID"); 249185579Sluigi boot0[OFF_SERIAL] = vol_id[0]; 250185579Sluigi boot0[OFF_SERIAL+1] = vol_id[1]; 251185579Sluigi boot0[OFF_SERIAL+2] = vol_id[2]; 252185579Sluigi boot0[OFF_SERIAL+3] = vol_id[3]; 253185579Sluigi up = 1; /* force update */ 254185579Sluigi } 25563092Sjhb /* write the MBR back to disk */ 25663092Sjhb if (up) 25763092Sjhb write_mbr(disk, 0, boot0, boot0_size); 25863092Sjhb 25963092Sjhb /* display the MBR */ 26063092Sjhb if (v_flag) 26163092Sjhb display_mbr(boot0); 26263092Sjhb 26363092Sjhb /* clean up */ 26463092Sjhb if (mbr != boot0) 26563092Sjhb free(boot0); 26663092Sjhb free(mbr); 26787643Smikeh free(disk); 26863092Sjhb 26963092Sjhb return 0; 27063092Sjhb} 27163092Sjhb 272185579Sluigi/* get or set the 'bell' character to be used in case of errors. 273185579Sluigi * Lookup for a certain code sequence, return -1 if not found. 274185579Sluigi */ 275185579Sluigistatic int 276185579Sluigiset_bell(u_int8_t *mbr, int new_bell, int report) 277185579Sluigi{ 278185579Sluigi /* lookup sequence: 0x100 means skip, 0x200 means done */ 279185579Sluigi static unsigned seq[] = 280185579Sluigi { 0xb0, 0x100, 0xe8, 0x100, 0x100, 0x30, 0xe4, 0x200 }; 281185579Sluigi int ofs, i, c; 282185579Sluigi for (ofs = 0x60; ofs < 0x180; ofs++) { /* search range */ 283185579Sluigi if (mbr[ofs] != seq[0]) /* search initial pattern */ 284185579Sluigi continue; 285185579Sluigi for (i=0;; i++) { 286185579Sluigi if (seq[i] == 0x200) { /* found */ 287185579Sluigi c = mbr[ofs+1]; 288185579Sluigi if (!report) 289185579Sluigi mbr[ofs+1] = c = new_bell; 290185579Sluigi else 291185579Sluigi printf(" bell=%c (0x%x)", 292185579Sluigi (c >= ' ' && c < 0x7f) ? c : ' ', c); 293185579Sluigi return c; 294185579Sluigi } 295185579Sluigi if (seq[i] != 0x100 && seq[i] != mbr[ofs+i]) 296185579Sluigi break; 297185579Sluigi } 298185579Sluigi } 299185579Sluigi warn("bell not found"); 300185579Sluigi return -1; 301185579Sluigi} 30263092Sjhb/* 30363092Sjhb * Read in the MBR of the disk. If it is boot0, then use the version to 30463092Sjhb * read in all of it if necessary. Use pointers to return a malloc'd 30563092Sjhb * buffer containing the MBR and then return its size. 30663092Sjhb */ 30763092Sjhbstatic int 30863092Sjhbread_mbr(const char *disk, u_int8_t **mbr, int check_version) 30963092Sjhb{ 31063092Sjhb u_int8_t buf[MBRSIZE]; 31163092Sjhb int mbr_size, fd; 312185579Sluigi int ver; 31363092Sjhb ssize_t n; 31463092Sjhb 31563092Sjhb if ((fd = open(disk, O_RDONLY)) == -1) 316108394Sphk err(1, "open %s", disk); 31763092Sjhb if ((n = read(fd, buf, MBRSIZE)) == -1) 318108394Sphk err(1, "read %s", disk); 31963092Sjhb if (n != MBRSIZE) 32063092Sjhb errx(1, "%s: short read", disk); 32163092Sjhb if (cv2(buf + OFF_MAGIC) != 0xaa55) 32263092Sjhb errx(1, "%s: bad magic", disk); 32363092Sjhb 324185579Sluigi if (! (ver = boot0bs(buf))) { 32563092Sjhb if (check_version) 32663092Sjhb errx(1, "%s: unknown or incompatible boot code", disk); 32763092Sjhb } else if (boot0version(buf) == 0x101) { 32863092Sjhb mbr_size = 1024; 32963092Sjhb if ((*mbr = malloc(mbr_size)) == NULL) 33063092Sjhb errx(1, "%s: unable to allocate read buffer", disk); 33163092Sjhb if (lseek(fd, 0, SEEK_SET) == -1 || 33263092Sjhb (n = read(fd, *mbr, mbr_size)) == -1) 33363092Sjhb err(1, "%s", disk); 33463092Sjhb if (n != mbr_size) 33563092Sjhb errx(1, "%s: short read", disk); 336227876Skevlo close(fd); 33763092Sjhb return (mbr_size); 33844196Srnordier } 339294338Sjhb if ((*mbr = malloc(sizeof(buf))) == NULL) 340294338Sjhb errx(1, "%s: unable to allocate MBR buffer", disk); 34163092Sjhb memcpy(*mbr, buf, sizeof(buf)); 342227876Skevlo close(fd); 34363092Sjhb 34463092Sjhb return sizeof(buf); 34563092Sjhb} 34663092Sjhb 347227297Saestatic int 348227297Saegeom_class_available(const char *name) 349227297Sae{ 350227297Sae struct gclass *class; 351227297Sae struct gmesh mesh; 352227297Sae int error; 353227297Sae 354227297Sae error = geom_gettree(&mesh); 355227297Sae if (error != 0) 356227297Sae errc(1, error, "Cannot get GEOM tree"); 357227297Sae 358227297Sae LIST_FOREACH(class, &mesh.lg_class, lg_class) { 359227297Sae if (strcmp(class->lg_name, name) == 0) { 360227297Sae geom_deletetree(&mesh); 361227297Sae return (1); 362227297Sae } 363227297Sae } 364227297Sae 365227297Sae geom_deletetree(&mesh); 366227297Sae return (0); 367227297Sae} 368227297Sae 36963092Sjhb/* 37063092Sjhb * Write out the mbr to the specified file. 37163092Sjhb */ 37263092Sjhbstatic void 37363092Sjhbwrite_mbr(const char *fname, int flags, u_int8_t *mbr, int mbr_size) 37463092Sjhb{ 375227297Sae struct gctl_req *grq; 376227297Sae const char *errmsg; 377227297Sae char *pname; 378227297Sae ssize_t n; 379227297Sae int fd; 380148036Sphk 381227297Sae fd = open(fname, O_WRONLY | flags, 0666); 382227297Sae if (fd != -1) { 383227297Sae n = write(fd, mbr, mbr_size); 384227297Sae close(fd); 385227297Sae if (n != mbr_size) 386227297Sae errx(1, "%s: short write", fname); 387227297Sae return; 388227297Sae } 389189273Smarcel 390227297Sae /* 391227297Sae * If we're called to write to a backup file, don't try to 392227297Sae * write through GEOM. 393227297Sae */ 394227297Sae if (flags != 0) 395227297Sae err(1, "can't open file %s to write backup", fname); 396189273Smarcel 397227297Sae /* Try open it read only. */ 398227297Sae fd = open(fname, O_RDONLY); 399227297Sae if (fd == -1) { 400227297Sae warn("error opening %s", fname); 401227297Sae return; 402227297Sae } 403189273Smarcel 404227297Sae pname = g_providername(fd); 405227297Sae if (pname == NULL) { 406227297Sae warn("error getting providername for %s", fname); 407227297Sae return; 408227297Sae } 409227297Sae 410227297Sae /* First check that GEOM_PART is available */ 411227297Sae if (geom_class_available("PART") != 0) { 412227297Sae grq = gctl_get_handle(); 413227297Sae gctl_ro_param(grq, "class", -1, "PART"); 414227297Sae gctl_ro_param(grq, "arg0", -1, pname); 415227297Sae gctl_ro_param(grq, "verb", -1, "bootcode"); 416227297Sae gctl_ro_param(grq, "bootcode", mbr_size, mbr); 417227297Sae gctl_ro_param(grq, "flags", -1, "C"); 418227297Sae errmsg = gctl_issue(grq); 419227297Sae if (errmsg != NULL && errmsg[0] != '\0') 420227297Sae errx(1, "GEOM_PART: write bootcode to %s failed: %s", 421227297Sae fname, errmsg); 422227297Sae gctl_free(grq); 423227297Sae } else if (geom_class_available("MBR") != 0) { 424227297Sae grq = gctl_get_handle(); 425227297Sae gctl_ro_param(grq, "verb", -1, "write MBR"); 426227297Sae gctl_ro_param(grq, "class", -1, "MBR"); 427227297Sae gctl_ro_param(grq, "geom", -1, pname); 428227297Sae gctl_ro_param(grq, "data", mbr_size, mbr); 429227297Sae errmsg = gctl_issue(grq); 430227297Sae if (errmsg != NULL) 431227297Sae err(1, "GEOM_MBR: write MBR to %s failed", fname); 432227297Sae gctl_free(grq); 433227297Sae } else 434227297Sae errx(1, "can't write MBR to %s", fname); 435227297Sae free(pname); 43663092Sjhb} 43763092Sjhb 43863092Sjhb/* 43963092Sjhb * Outputs an informative dump of the data in the MBR to stdout. 44063092Sjhb */ 44163092Sjhbstatic void 44263092Sjhbdisplay_mbr(u_int8_t *mbr) 44363092Sjhb{ 44463092Sjhb struct dos_partition *part; 44563092Sjhb int i, version; 44663092Sjhb 44763092Sjhb part = (struct dos_partition *)(mbr + DOSPARTOFF); 44863092Sjhb printf(fmt0); 44963092Sjhb for (i = 0; i < NDOSPART; i++) 45063092Sjhb if (part[i].dp_typ) 45163092Sjhb printf(fmt1, 1 + i, part[i].dp_flag, 45263092Sjhb part[i].dp_scyl + ((part[i].dp_ssect & 0xc0) << 2), 45363092Sjhb part[i].dp_shd, part[i].dp_ssect & 0x3f, part[i].dp_typ, 45463092Sjhb part[i].dp_ecyl + ((part[i].dp_esect & 0xc0) << 2), 45563092Sjhb part[i].dp_ehd, part[i].dp_esect & 0x3f, part[i].dp_start, 45663092Sjhb part[i].dp_size); 45763092Sjhb printf("\n"); 45863092Sjhb version = boot0version(mbr); 459185579Sluigi printf("version=%d.%d drive=0x%x mask=0x%x ticks=%u", 46063092Sjhb version >> 8, version & 0xff, mbr[OFF_DRIVE], 46163092Sjhb mbr[OFF_FLAGS] & 0xf, cv2(mbr + OFF_TICKS)); 462185579Sluigi set_bell(mbr, 0, 1); 463185579Sluigi printf("\noptions="); 46463092Sjhb for (i = 0; i < nopt; i++) { 46563092Sjhb if (i) 46663092Sjhb printf(","); 46763092Sjhb if (!(mbr[OFF_FLAGS] & 1 << (7 - i)) ^ opttbl[i].def) 46863092Sjhb printf("no"); 46963092Sjhb printf("%s", opttbl[i].tok); 47044196Srnordier } 47163092Sjhb printf("\n"); 472185579Sluigi if (b0_ver == 2) 473185579Sluigi printf("volume serial ID %02x%02x-%02x%02x\n", 474185579Sluigi mbr[OFF_SERIAL], mbr[OFF_SERIAL+1], 475185579Sluigi mbr[OFF_SERIAL+2], mbr[OFF_SERIAL+3]); 47664797Sdwmalone printf("default_selection=F%d (", mbr[OFF_OPT] + 1); 47764797Sdwmalone if (mbr[OFF_OPT] < 4) 47864797Sdwmalone printf("Slice %d", mbr[OFF_OPT] + 1); 479228738Sjhb else if (mbr[OFF_OPT] == 4) 480228738Sjhb printf("Drive 1"); 48164797Sdwmalone else 482228738Sjhb printf("PXE"); 48364797Sdwmalone printf(")\n"); 48444196Srnordier} 48544196Srnordier 48648113Srnordier/* 48763034Sjhb * Return the boot0 version with the minor revision in the low byte, and 48863034Sjhb * the major revision in the next higher byte. 48963034Sjhb */ 49063034Sjhbstatic int 49163034Sjhbboot0version(const u_int8_t *bs) 49263034Sjhb{ 49363034Sjhb /* Check for old version, and return 0x100 if found. */ 494185579Sluigi int v = boot0bs(bs); 495185579Sluigi if (v != 0) 496185579Sluigi return v << 8; 49763034Sjhb 49863034Sjhb /* We have a newer boot0, so extract the version number and return it. */ 49987643Smikeh return *(const int *)(bs + OFF_VERSION) & 0xffff; 50063034Sjhb} 50163034Sjhb 502185579Sluigi/* descriptor of a pattern to match. 503185579Sluigi * Start from the first entry trying to match the chunk of bytes, 504185579Sluigi * if you hit an entry with len=0 terminate the search and report 505185579Sluigi * off as the version. Otherwise skip to the next block after len=0 506185579Sluigi * An entry with len=0, off=0 is the end marker. 507185579Sluigi */ 508185579Sluigistruct byte_pattern { 509185579Sluigi unsigned off; 510185579Sluigi unsigned len; 511185579Sluigi u_int8_t *key; 512185579Sluigi}; 513185579Sluigi 51463034Sjhb/* 51548113Srnordier * Decide if we have valid boot0 boot code by looking for 51648113Srnordier * characteristic byte sequences at fixed offsets. 51748113Srnordier */ 51848113Srnordierstatic int 51948113Srnordierboot0bs(const u_int8_t *bs) 52048113Srnordier{ 521185579Sluigi /* the initial code sequence */ 52263034Sjhb static u_int8_t id0[] = {0xfc, 0x31, 0xc0, 0x8e, 0xc0, 0x8e, 0xd8, 52363034Sjhb 0x8e, 0xd0, 0xbc, 0x00, 0x7c }; 524185579Sluigi /* the drive id */ 52548113Srnordier static u_int8_t id1[] = {'D', 'r', 'i', 'v', 'e', ' '}; 526185579Sluigi static struct byte_pattern patterns[] = { 52763034Sjhb {0x0, sizeof(id0), id0}, 528185579Sluigi {0x1b2, sizeof(id1), id1}, 529185579Sluigi {1, 0, NULL}, 530185579Sluigi {0x0, sizeof(id0), id0}, /* version with NT support */ 531185579Sluigi {0x1ae, sizeof(id1), id1}, 532185579Sluigi {2, 0, NULL}, 533185579Sluigi {0, 0, NULL}, 53448113Srnordier }; 535185579Sluigi struct byte_pattern *p = patterns; 53648113Srnordier 537185579Sluigi for (; p->off || p->len; p++) { 538185579Sluigi if (p->len == 0) 539185579Sluigi break; 540185579Sluigi if (!memcmp(bs + p->off, p->key, p->len)) /* match */ 541185579Sluigi continue; 542185579Sluigi while (p->len) /* skip to next block */ 543185579Sluigi p++; 544185579Sluigi } 545185579Sluigi b0_ver = p->off; /* XXX ugly side effect */ 546185579Sluigi return p->off; 547129302Sstefanf} 54848113Srnordier 54948113Srnordier/* 55048113Srnordier * Adjust "and" and "or" masks for a -o option argument. 55148113Srnordier */ 55244196Srnordierstatic void 55344196Srnordierstropt(const char *arg, int *xa, int *xo) 55444196Srnordier{ 55544196Srnordier const char *q; 55644196Srnordier char *s, *s1; 55744196Srnordier int inv, i, x; 55844196Srnordier 55944196Srnordier if (!(s = strdup(arg))) 56044196Srnordier err(1, NULL); 56144196Srnordier for (s1 = s; (q = strtok(s1, ",")); s1 = NULL) { 56244196Srnordier if ((inv = !strncmp(q, "no", 2))) 56344196Srnordier q += 2; 56444196Srnordier for (i = 0; i < nopt; i++) 56544196Srnordier if (!strcmp(q, opttbl[i].tok)) 56644196Srnordier break; 56744196Srnordier if (i == nopt) 56844196Srnordier errx(1, "%s: Unknown -o option", q); 56944196Srnordier if (opttbl[i].def) 57044196Srnordier inv ^= 1; 57144196Srnordier x = 1 << (7 - i); 57244196Srnordier if (inv) 57344196Srnordier *xa &= ~x; 57444196Srnordier else 57544196Srnordier *xo |= x; 57644196Srnordier } 57744196Srnordier free(s); 57844196Srnordier} 57944196Srnordier 58048113Srnordier/* 58148113Srnordier * Convert and check an option argument. 58248113Srnordier */ 58344196Srnordierstatic int 58444196Srnordierargtoi(const char *arg, int lo, int hi, int opt) 58544196Srnordier{ 58644196Srnordier char *s; 58744196Srnordier long x; 58844196Srnordier 58944196Srnordier errno = 0; 59044196Srnordier x = strtol(arg, &s, 0); 59144196Srnordier if (errno || !*arg || *s || x < lo || x > hi) 59244196Srnordier errx(1, "%s: Bad argument to -%c option", arg, opt); 59344196Srnordier return x; 59444196Srnordier} 59544196Srnordier 59648113Srnordier/* 59748113Srnordier * Display usage information. 59848113Srnordier */ 59944196Srnordierstatic void 60044196Srnordierusage(void) 60144196Srnordier{ 60244196Srnordier fprintf(stderr, "%s\n%s\n", 60348038Srnordier "usage: boot0cfg [-Bv] [-b boot0] [-d drive] [-f file] [-m mask]", 60474668Siedowse " [-o options] [-s slice] [-t ticks] disk"); 60544196Srnordier exit(1); 60644196Srnordier} 607