10SN/A/* 25323SN/A * SPDX-License-Identifier: BSD-2-Clause 30SN/A * 40SN/A * Copyright (c) 2008 Luigi Rizzo 50SN/A * Copyright (c) 1999 Robert Nordier 60SN/A * All rights reserved. 70SN/A * 80SN/A * Redistribution and use in source and binary forms, with or without 90SN/A * modification, are permitted provided that the following conditions 100SN/A * are met: 110SN/A * 1. Redistributions of source code must retain the above copyright 120SN/A * notice, this list of conditions and the following disclaimer. 130SN/A * 2. Redistributions in binary form must reproduce the above copyright 140SN/A * notice, this list of conditions and the following disclaimer in the 150SN/A * documentation and/or other materials provided with the distribution. 160SN/A * 170SN/A * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND 180SN/A * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191472SN/A * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 201472SN/A * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 211472SN/A * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 220SN/A * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 230SN/A * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 240SN/A * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 250SN/A * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 260SN/A * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 270SN/A * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 280SN/A */ 290SN/A 300SN/A#include <sys/param.h> 310SN/A#include <sys/disklabel.h> 320SN/A#include <sys/diskmbr.h> 330SN/A#include <sys/stat.h> 340SN/A 350SN/A#include <err.h> 360SN/A#include <errno.h> 370SN/A#include <fcntl.h> 380SN/A#include <libgeom.h> 390SN/A#include <paths.h> 400SN/A#include <stdio.h> 410SN/A#include <stdlib.h> 420SN/A#include <string.h> 430SN/A#include <unistd.h> 445397SN/A 455397SN/A#define MBRSIZE 512 /* master boot record size */ 460SN/A 475397SN/A#define OFF_VERSION 0x1b0 /* offset: version number, only boot0version */ 485397SN/A#define OFF_SERIAL 0x1b8 /* offset: volume serial number */ 495397SN/A#define OFF_PTBL 0x1be /* offset: partition table */ 500SN/A#define OFF_MAGIC 0x1fe /* offset: magic number */ 515397SN/A/* 525397SN/A * Offsets to the parameters of the 512-byte boot block. 535397SN/A * For historical reasons they are set as macros 540SN/A */ 555397SN/Astruct opt_offsets { 565397SN/A int opt; 575397SN/A int drive; 580SN/A int flags; 595397SN/A int ticks; 605397SN/A}; 615397SN/A 620SN/Astatic struct opt_offsets b0_ofs[] = { 635397SN/A { 0x0, 0x0, 0x0, 0x0 }, /* no boot block */ 645397SN/A { 0x1b9, 0x1ba, 0x1bb, 0x1bc }, /* original block */ 655397SN/A { 0x1b5, 0x1b6, 0x1b7, 0x1bc }, /* NT_SERIAL block */ 665397SN/A}; 675397SN/A 685397SN/Astatic int b0_ver; /* boot block version set by boot0bs */ 695397SN/A 705397SN/A#define OFF_OPT (b0_ofs[b0_ver].opt) /* default boot option */ 715397SN/A#define OFF_DRIVE (b0_ofs[b0_ver].drive) /* setdrv drive */ 720SN/A#define OFF_FLAGS (b0_ofs[b0_ver].flags) /* option flags */ 730SN/A#define OFF_TICKS (b0_ofs[b0_ver].ticks) /* clock ticks */ 740SN/A 750SN/A 760SN/A#define cv2(p) ((p)[0] | (p)[1] << 010) 770SN/A 785397SN/A#define mk2(p, x) \ 795397SN/A (p)[0] = (u_int8_t)(x), \ 805397SN/A (p)[1] = (u_int8_t)((x) >> 010) 810SN/A 820SN/Astatic const struct { 830SN/A const char *tok; 845397SN/A int def; 850SN/A} opttbl[] = { 860SN/A {"packet", 0}, 870SN/A {"update", 1}, 880SN/A {"setdrv", 0} 890SN/A}; 905397SN/Astatic const int nopt = nitems(opttbl); 915397SN/A 925397SN/Astatic const char fmt0[] = "# flag start chs type" 930SN/A " end chs offset size\n"; 940SN/A 950SN/Astatic const char fmt1[] = "%d 0x%02x %4u:%3u:%2u 0x%02x" 960SN/A " %4u:%3u:%2u %10u %10u\n"; 970SN/A 985397SN/Astatic int geom_class_available(const char *); 995397SN/Astatic int read_mbr(const char *, u_int8_t **, int); 1005397SN/Astatic void write_mbr(const char *, int, u_int8_t *, int, int); 1015397SN/Astatic void display_mbr(u_int8_t *); 1025397SN/Astatic int boot0version(const u_int8_t *); 1030SN/Astatic int boot0bs(const u_int8_t *); 1040SN/Astatic void stropt(const char *, int *, int *); 1050SN/Astatic int argtoi(const char *, int, int, int); 1065397SN/Astatic int set_bell(u_int8_t *, int, int); 1075397SN/Astatic void usage(void) __dead2; 1085397SN/A 1095397SN/Astatic unsigned vol_id[5]; /* 4 plus 1 for flag */ 1105397SN/A 1110SN/Astatic int v_flag; 1125397SN/A/* 1135397SN/A * Boot manager installation/configuration utility. 1145397SN/A */ 1155397SN/Aint 1165397SN/Amain(int argc, char *argv[]) 1175397SN/A{ 1180SN/A u_int8_t *mbr, *boot0; 1190SN/A int boot0_size, mbr_size; 1200SN/A const char *bpath, *fpath; 1210SN/A char *disk; 1220SN/A int B_flag, o_flag; 1235397SN/A int d_arg, m_arg, s_arg, t_arg; 1245397SN/A int o_and, o_or, o_e = -1; 1255397SN/A int up, c; 1265397SN/A 1270SN/A bpath = "/boot/boot0"; 1285397SN/A fpath = NULL; 1295397SN/A B_flag = v_flag = o_flag = 0; 1305397SN/A d_arg = m_arg = s_arg = t_arg = -1; 1315397SN/A o_and = 0xff; 1320SN/A o_or = 0; 1335397SN/A while ((c = getopt(argc, argv, "Bvb:d:e:f:i:m:o:s:t:")) != -1) 1340SN/A switch (c) { 1350SN/A case 'B': 1360SN/A B_flag = 1; 1375397SN/A break; 1380SN/A case 'v': 1395397SN/A v_flag = 1; 1405397SN/A break; 1415397SN/A case 'b': 1425397SN/A bpath = optarg; 1435397SN/A break; 1440SN/A case 'd': 1455397SN/A d_arg = argtoi(optarg, 0, 0xff, 'd'); 1465397SN/A break; 1475397SN/A case 'e': 1480SN/A if (optarg[0] == '0' && optarg[1] == 'x') 1490SN/A sscanf(optarg, "0x%02x", &o_e); 1500SN/A else 1510SN/A o_e = optarg[0]; 1525397SN/A break; 1535397SN/A case 'f': 1545397SN/A fpath = optarg; 1550SN/A break; 1565397SN/A case 'i': 1575397SN/A if (sscanf(optarg, "%02x%02x-%02x%02x", 1585397SN/A vol_id, vol_id+1, vol_id+2, vol_id+3) == 4) 1595397SN/A vol_id[4] = 1; 1605397SN/A else 1615397SN/A errx(1, "bad argument %s", optarg); 1625397SN/A break; 1635397SN/A case 'm': 1640SN/A m_arg = argtoi(optarg, 0, 0xf, 'm'); 1655397SN/A break; 1665397SN/A case 'o': 1675397SN/A stropt(optarg, &o_and, &o_or); 1685397SN/A o_flag = 1; 1695397SN/A break; 1700SN/A case 's': 1715397SN/A if (strcasecmp(optarg, "pxe") == 0) 1725397SN/A s_arg = 6; 1735397SN/A else 1740SN/A s_arg = argtoi(optarg, 1, 6, 's'); 1750SN/A break; 1765397SN/A case 't': 1775397SN/A t_arg = argtoi(optarg, 1, 0xffff, 't'); 1785397SN/A break; 1795397SN/A default: 1805397SN/A usage(); 1815397SN/A } 1825397SN/A argc -= optind; 1835397SN/A argv += optind; 1845397SN/A if (argc != 1) 1855397SN/A usage(); 1865397SN/A disk = g_device_path(*argv); 1875397SN/A if (disk == NULL) 1885397SN/A errx(1, "Unable to get providername for %s\n", *argv); 1895397SN/A up = B_flag || d_arg != -1 || m_arg != -1 || o_flag || s_arg != -1 1905397SN/A || t_arg != -1; 1915397SN/A 1925397SN/A /* open the disk and read in the existing mbr. Either here or 1930SN/A * when reading the block from disk, we do check for the version 1945397SN/A * and abort if a suitable block is not found. 1955397SN/A */ 1960SN/A mbr_size = read_mbr(disk, &mbr, !B_flag); 1970SN/A 1980SN/A /* save the existing MBR if we are asked to do so */ 1990SN/A if (fpath) 2000SN/A write_mbr(fpath, O_CREAT | O_TRUNC, mbr, mbr_size, 0); 2014626SN/A 2020SN/A /* 2030SN/A * If we are installing the boot loader, read it from disk and copy the 2044626SN/A * slice table over from the existing MBR. If not, then point boot0 2050SN/A * back at the MBR we just read in. After this, boot0 is the data to 2060SN/A * write back to disk if we are going to do a write. 2070SN/A */ 2080SN/A if (B_flag) { 2090SN/A boot0_size = read_mbr(bpath, &boot0, 1); 2100SN/A memcpy(boot0 + OFF_PTBL, mbr + OFF_PTBL, 2110SN/A sizeof(struct dos_partition) * NDOSPART); 2120SN/A if (b0_ver == 2) /* volume serial number support */ 2130SN/A memcpy(boot0 + OFF_SERIAL, mbr + OFF_SERIAL, 4); 2140SN/A } else { 2150SN/A boot0 = mbr; 2160SN/A boot0_size = mbr_size; 2170SN/A } 2180SN/A 2190SN/A /* set the drive */ 2200SN/A if (d_arg != -1) 2210SN/A boot0[OFF_DRIVE] = d_arg; 2220SN/A 2230SN/A /* set various flags */ 2240SN/A if (m_arg != -1) { 2250SN/A boot0[OFF_FLAGS] &= 0xf0; 2260SN/A boot0[OFF_FLAGS] |= m_arg; 2270SN/A } 2280SN/A if (o_flag) { 2290SN/A boot0[OFF_FLAGS] &= o_and; 2300SN/A boot0[OFF_FLAGS] |= o_or; 2310SN/A } 2325397SN/A 2335397SN/A /* set the default boot selection */ 2345397SN/A if (s_arg != -1) 2350SN/A boot0[OFF_OPT] = s_arg - 1; 2360SN/A 2370SN/A /* set the timeout */ 2383602SN/A if (t_arg != -1) 2390SN/A mk2(boot0 + OFF_TICKS, t_arg); 2400SN/A 2410SN/A /* set the bell char */ 2420SN/A if (o_e != -1 && set_bell(boot0, o_e, 0) != -1) 243529SN/A up = 1; 2445397SN/A 2455397SN/A if (vol_id[4]) { 2465397SN/A if (b0_ver != 2) 2475397SN/A errx(1, "incompatible boot block, cannot set volume ID"); 2485397SN/A boot0[OFF_SERIAL] = vol_id[0]; 2495397SN/A boot0[OFF_SERIAL+1] = vol_id[1]; 2505397SN/A boot0[OFF_SERIAL+2] = vol_id[2]; 2510SN/A boot0[OFF_SERIAL+3] = vol_id[3]; 2520SN/A up = 1; /* force update */ 2530SN/A } 2545397SN/A /* write the MBR back to disk */ 2555397SN/A if (up) 2565397SN/A write_mbr(disk, 0, boot0, boot0_size, vol_id[4] || b0_ver == 1); 2575397SN/A 2585397SN/A /* display the MBR */ 2595397SN/A if (v_flag) 2605397SN/A display_mbr(boot0); 2610SN/A 2620SN/A /* clean up */ 2630SN/A if (mbr != boot0) 2640SN/A free(boot0); 2655397SN/A free(mbr); 2665397SN/A free(disk); 2670SN/A 2685397SN/A return 0; 2695397SN/A} 2705397SN/A 2715397SN/A/* get or set the 'bell' character to be used in case of errors. 2725397SN/A * Lookup for a certain code sequence, return -1 if not found. 2735397SN/A */ 2745397SN/Astatic int 2755397SN/Aset_bell(u_int8_t *mbr, int new_bell, int report) 2765397SN/A{ 2775397SN/A /* lookup sequence: 0x100 means skip, 0x200 means done */ 2785397SN/A static unsigned seq[] = 2795397SN/A { 0xb0, 0x100, 0xe8, 0x100, 0x100, 0x30, 0xe4, 0x200 }; 2800SN/A int ofs, i, c; 2815397SN/A for (ofs = 0x60; ofs < 0x180; ofs++) { /* search range */ 2825397SN/A if (mbr[ofs] != seq[0]) /* search initial pattern */ 2830SN/A continue; 2840SN/A for (i=0;; i++) { 2850SN/A if (seq[i] == 0x200) { /* found */ 2860SN/A c = mbr[ofs+1]; 2870SN/A if (!report) 2885397SN/A mbr[ofs+1] = c = new_bell; 2890SN/A else 2900SN/A printf(" bell=%c (0x%x)", 2915397SN/A (c >= ' ' && c < 0x7f) ? c : ' ', c); 2925397SN/A return c; 2935397SN/A } 2945397SN/A if (seq[i] != 0x100 && seq[i] != mbr[ofs+i]) 2955397SN/A break; 2965397SN/A } 2975397SN/A } 2985397SN/A warn("bell not found"); 2995397SN/A return -1; 3005397SN/A} 3015397SN/A/* 3025397SN/A * Read in the MBR of the disk. If it is boot0, then use the version to 3035397SN/A * read in all of it if necessary. Use pointers to return a malloc'd 3045397SN/A * buffer containing the MBR and then return its size. 3055397SN/A */ 3060SN/Astatic int 3075397SN/Aread_mbr(const char *disk, u_int8_t **mbr, int check_version) 3085397SN/A{ 3095397SN/A u_int8_t buf[MBRSIZE]; 3105397SN/A int mbr_size, fd; 3115397SN/A int ver; 3125397SN/A ssize_t n; 3135397SN/A 3140SN/A if ((fd = open(disk, O_RDONLY)) == -1) 3155397SN/A err(1, "open %s", disk); 3165397SN/A if ((n = read(fd, buf, MBRSIZE)) == -1) 3175397SN/A err(1, "read %s", disk); 3185397SN/A if (n != MBRSIZE) 3195397SN/A errx(1, "%s: short read", disk); 3205397SN/A if (cv2(buf + OFF_MAGIC) != 0xaa55) 3215397SN/A errx(1, "%s: bad magic", disk); 3220SN/A 3235397SN/A if (! (ver = boot0bs(buf))) { 3245397SN/A if (check_version) 3255397SN/A errx(1, "%s: unknown or incompatible boot code", disk); 3265397SN/A } else if (boot0version(buf) == 0x101) { 3270SN/A mbr_size = 1024; 3285397SN/A if ((*mbr = malloc(mbr_size)) == NULL) 3295397SN/A errx(1, "%s: unable to allocate read buffer", disk); 3305397SN/A if (lseek(fd, 0, SEEK_SET) == -1 || 3315397SN/A (n = read(fd, *mbr, mbr_size)) == -1) 3325397SN/A err(1, "%s", disk); 3330SN/A if (n != mbr_size) 3345397SN/A errx(1, "%s: short read", disk); 3355397SN/A close(fd); 3365397SN/A return (mbr_size); 3375397SN/A } 3380SN/A if ((*mbr = malloc(sizeof(buf))) == NULL) 3395397SN/A errx(1, "%s: unable to allocate MBR buffer", disk); 3405397SN/A memcpy(*mbr, buf, sizeof(buf)); 3415397SN/A close(fd); 3425397SN/A 3430SN/A return sizeof(buf); 3445397SN/A} 3455397SN/A 3465397SN/Astatic int 3475397SN/Ageom_class_available(const char *name) 3485397SN/A{ 3495397SN/A struct gclass *class; 3505397SN/A struct gmesh mesh; 3515397SN/A int error; 3525397SN/A 3535397SN/A error = geom_gettree(&mesh); 3540SN/A if (error != 0) 3555397SN/A errc(1, error, "Cannot get GEOM tree"); 3565397SN/A 3575397SN/A LIST_FOREACH(class, &mesh.lg_class, lg_class) { 3585397SN/A if (strcmp(class->lg_name, name) == 0) { 3595397SN/A geom_deletetree(&mesh); 3605397SN/A return (1); 3615397SN/A } 3625397SN/A } 3630SN/A 3645397SN/A geom_deletetree(&mesh); 3655397SN/A return (0); 3665397SN/A} 3675397SN/A 3685397SN/A/* 3695397SN/A * Write out the mbr to the specified file. 3705397SN/A */ 3710SN/Astatic void 3725397SN/Awrite_mbr(const char *fname, int flags, u_int8_t *mbr, int mbr_size, 3735397SN/A int disable_dsn) 3745397SN/A{ 3755397SN/A struct gctl_req *grq; 3765397SN/A const char *errmsg; 3775397SN/A char *pname; 3785397SN/A ssize_t n; 3790SN/A int fd; 3805397SN/A 3815397SN/A fd = open(fname, O_WRONLY | flags, 0666); 3825397SN/A if (fd != -1) { 3835397SN/A n = write(fd, mbr, mbr_size); 3845397SN/A close(fd); 3855397SN/A if (n != mbr_size) 3865397SN/A errx(1, "%s: short write", fname); 3875397SN/A return; 3885397SN/A } 3895397SN/A 3905397SN/A /* 3910SN/A * If we're called to write to a backup file, don't try to 3925397SN/A * write through GEOM. 3930SN/A */ 3945397SN/A if (flags != 0) 3955397SN/A err(1, "can't open file %s to write backup", fname); 3965397SN/A 3970SN/A /* Try open it read only. */ 3980SN/A fd = open(fname, O_RDONLY); 3990SN/A if (fd == -1) { 4000SN/A warn("error opening %s", fname); 4010SN/A return; 4020SN/A } 4030SN/A 4040SN/A pname = g_providername(fd); 4050SN/A if (pname == NULL) { 4060SN/A warn("error getting providername for %s", fname); 4075397SN/A return; 4085397SN/A } 4090SN/A 4105397SN/A /* First check that GEOM_PART is available */ 4115397SN/A if (geom_class_available("PART") != 0) { 4125397SN/A grq = gctl_get_handle(); 4130SN/A gctl_ro_param(grq, "class", -1, "PART"); 4145397SN/A gctl_ro_param(grq, "arg0", -1, pname); 4150SN/A gctl_ro_param(grq, "verb", -1, "bootcode"); 4160SN/A gctl_ro_param(grq, "bootcode", mbr_size, mbr); 4170SN/A gctl_ro_param(grq, "flags", -1, "C"); 4180SN/A if (disable_dsn) 4190SN/A gctl_ro_param(grq, "skip_dsn", sizeof(int), 4205397SN/A &disable_dsn); 4215397SN/A errmsg = gctl_issue(grq); 4225397SN/A if (errmsg != NULL && errmsg[0] != '\0') 4230SN/A errx(1, "GEOM_PART: write bootcode to %s failed: %s", 4245397SN/A fname, errmsg); 4255397SN/A gctl_free(grq); 4265397SN/A } else 4275397SN/A errx(1, "can't write MBR to %s", fname); 4285397SN/A free(pname); 4295397SN/A} 4300SN/A 4315397SN/A/* 4325397SN/A * Outputs an informative dump of the data in the MBR to stdout. 4335397SN/A */ 4345397SN/Astatic void 4355397SN/Adisplay_mbr(u_int8_t *mbr) 4365397SN/A{ 4370SN/A struct dos_partition *part; 4385397SN/A int i, version; 4395397SN/A 4405397SN/A part = (struct dos_partition *)(mbr + DOSPARTOFF); 4415397SN/A printf(fmt0); 4425397SN/A for (i = 0; i < NDOSPART; i++) 4435397SN/A if (part[i].dp_typ) 4445397SN/A printf(fmt1, 1 + i, part[i].dp_flag, 4455397SN/A part[i].dp_scyl + ((part[i].dp_ssect & 0xc0) << 2), 4465397SN/A part[i].dp_shd, part[i].dp_ssect & 0x3f, part[i].dp_typ, 4470SN/A part[i].dp_ecyl + ((part[i].dp_esect & 0xc0) << 2), 4485397SN/A part[i].dp_ehd, part[i].dp_esect & 0x3f, part[i].dp_start, 4495397SN/A part[i].dp_size); 4505397SN/A printf("\n"); 4515397SN/A version = boot0version(mbr); 4525397SN/A printf("version=%d.%d drive=0x%x mask=0x%x ticks=%u", 4535397SN/A version >> 8, version & 0xff, mbr[OFF_DRIVE], 4545397SN/A mbr[OFF_FLAGS] & 0xf, cv2(mbr + OFF_TICKS)); 4555397SN/A set_bell(mbr, 0, 1); 4565397SN/A printf("\noptions="); 4570SN/A for (i = 0; i < nopt; i++) { 4585397SN/A if (i) 4590SN/A printf(","); 4600SN/A if (!(mbr[OFF_FLAGS] & 1 << (7 - i)) ^ opttbl[i].def) 4610SN/A printf("no"); 4620SN/A printf("%s", opttbl[i].tok); 4630SN/A } 4640SN/A printf("\n"); 4650SN/A if (b0_ver == 2) 4660SN/A printf("volume serial ID %02x%02x-%02x%02x\n", 4670SN/A mbr[OFF_SERIAL], mbr[OFF_SERIAL+1], 4680SN/A mbr[OFF_SERIAL+2], mbr[OFF_SERIAL+3]); 4690SN/A printf("default_selection=F%d (", mbr[OFF_OPT] + 1); 4700SN/A if (mbr[OFF_OPT] < 4) 4710SN/A printf("Slice %d", mbr[OFF_OPT] + 1); 4720SN/A else if (mbr[OFF_OPT] == 4) 4730SN/A printf("Drive 1"); 4740SN/A else 4755397SN/A printf("PXE"); 4760SN/A printf(")\n"); 4775397SN/A} 4780SN/A 4790SN/A/* 4800SN/A * Return the boot0 version with the minor revision in the low byte, and 4810SN/A * the major revision in the next higher byte. 4820SN/A */ 4830SN/Astatic int 4845397SN/Aboot0version(const u_int8_t *bs) 4850SN/A{ 4865397SN/A /* Check for old version, and return 0x100 if found. */ 4870SN/A int v = boot0bs(bs); 4880SN/A if (v != 0) 4890SN/A return v << 8; 4900SN/A 4910SN/A /* We have a newer boot0, so extract the version number and return it. */ 4920SN/A return *(const int *)(bs + OFF_VERSION) & 0xffff; 4930SN/A} 4940SN/A 4950SN/A/* descriptor of a pattern to match. 4960SN/A * Start from the first entry trying to match the chunk of bytes, 4970SN/A * if you hit an entry with len=0 terminate the search and report 4980SN/A * off as the version. Otherwise skip to the next block after len=0 4990SN/A * An entry with len=0, off=0 is the end marker. 5000SN/A */ 5010SN/Astruct byte_pattern { 5020SN/A unsigned off; 5030SN/A unsigned len; 5040SN/A u_int8_t *key; 5050SN/A}; 5060SN/A 5070SN/A/* 5080SN/A * Decide if we have valid boot0 boot code by looking for 5090SN/A * characteristic byte sequences at fixed offsets. 5100SN/A */ 5110SN/Astatic int 5120SN/Aboot0bs(const u_int8_t *bs) 5130SN/A{ 5140SN/A /* the initial code sequence */ 5150SN/A static u_int8_t id0[] = {0xfc, 0x31, 0xc0, 0x8e, 0xc0, 0x8e, 0xd8, 5160SN/A 0x8e, 0xd0, 0xbc, 0x00, 0x7c }; 5170SN/A /* the drive id */ 5180SN/A static u_int8_t id1[] = {'D', 'r', 'i', 'v', 'e', ' '}; 5190SN/A static struct byte_pattern patterns[] = { 5200SN/A {0x0, sizeof(id0), id0}, 5210SN/A {0x1b2, sizeof(id1), id1}, 5220SN/A {1, 0, NULL}, 5230SN/A {0x0, sizeof(id0), id0}, /* version with NT support */ 5240SN/A {0x1ae, sizeof(id1), id1}, 5250SN/A {2, 0, NULL}, 5260SN/A {0, 0, NULL}, 5270SN/A }; 5280SN/A struct byte_pattern *p = patterns; 5290SN/A 5300SN/A for (; p->off || p->len; p++) { 5310SN/A if (p->len == 0) 5320SN/A break; 5330SN/A if (!memcmp(bs + p->off, p->key, p->len)) /* match */ 5340SN/A continue; 5350SN/A while (p->len) /* skip to next block */ 53650SN/A p++; 53750SN/A } 53850SN/A b0_ver = p->off; /* XXX ugly side effect */ 53950SN/A return p->off; 5400SN/A} 5410SN/A 5420SN/A/* 5430SN/A * Adjust "and" and "or" masks for a -o option argument. 5440SN/A */ 5450SN/Astatic void 5460SN/Astropt(const char *arg, int *xa, int *xo) 5470SN/A{ 5480SN/A const char *q; 5490SN/A char *s, *s1; 5500SN/A int inv, i, x; 5510SN/A 5520SN/A if (!(s = strdup(arg))) 5530SN/A err(1, NULL); 5540SN/A for (s1 = s; (q = strtok(s1, ",")); s1 = NULL) { 5550SN/A if ((inv = !strncmp(q, "no", 2))) 5560SN/A q += 2; 5570SN/A for (i = 0; i < nopt; i++) 5580SN/A if (!strcmp(q, opttbl[i].tok)) 5590SN/A break; 5600SN/A if (i == nopt) 5610SN/A errx(1, "%s: Unknown -o option", q); 5620SN/A if (opttbl[i].def) 5630SN/A inv ^= 1; 5640SN/A x = 1 << (7 - i); 5650SN/A if (inv) 5660SN/A *xa &= ~x; 5670SN/A else 5680SN/A *xo |= x; 5690SN/A } 5700SN/A free(s); 5710SN/A} 5720SN/A 5730SN/A/* 5740SN/A * Convert and check an option argument. 5750SN/A */ 5760SN/Astatic int 5770SN/Aargtoi(const char *arg, int lo, int hi, int opt) 5780SN/A{ 5790SN/A char *s; 5800SN/A long x; 5810SN/A 5820SN/A errno = 0; 5830SN/A x = strtol(arg, &s, 0); 5840SN/A if (errno || !*arg || *s || x < lo || x > hi) 5850SN/A errx(1, "%s: Bad argument to -%c option", arg, opt); 5860SN/A return x; 5870SN/A} 5880SN/A 5890SN/A/* 5900SN/A * Display usage information. 5910SN/A */ 5920SN/Astatic void 5930SN/Ausage(void) 5940SN/A{ 5950SN/A fprintf(stderr, "%s\n%s\n", 5960SN/A "usage: boot0cfg [-Bv] [-b boot0] [-d drive] [-f file] [-m mask]", 5970SN/A " [-o options] [-s slice] [-t ticks] disk"); 5980SN/A exit(1); 5990SN/A} 6000SN/A