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-rw-r--r--contrib/syslinux-4.02/utils/isohybrid.c561
1 files changed, 561 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/utils/isohybrid.c b/contrib/syslinux-4.02/utils/isohybrid.c
new file mode 100644
index 0000000..57c1015
--- /dev/null
+++ b/contrib/syslinux-4.02/utils/isohybrid.c
@@ -0,0 +1,561 @@
+/*
+ * isohybrid.c: Post process an ISO 9660 image generated with mkisofs or
+ * genisoimage to allow - hybrid booting - as a CD-ROM or as a hard
+ * disk.
+ *
+ * This is based on the original Perl script written by H. Peter Anvin. The
+ * rewrite in C is to avoid dependency on Perl on a system under installation.
+ *
+ * Copyright (C) 2010 P J P <pj.pandit@yahoo.co.in>
+ *
+ * isohybrid is a free software; you can redistribute it and/or modify it
+ * under the terms of GNU General Public License as published by Free Software
+ * Foundation; either version 2 of the license, or (at your option) any later
+ * version.
+ *
+ * isohybrid is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with isohybrid; if not, see: <http://www.gnu.org/licenses>.
+ *
+ */
+
+#include <err.h>
+#include <time.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <alloca.h>
+#include <getopt.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <inttypes.h>
+
+#include "isohybrid.h"
+
+char *prog = NULL;
+extern int opterr, optind;
+
+uint8_t mode = 0;
+enum { VERBOSE = 1 };
+
+/* user options */
+uint16_t head = 64; /* 1 <= head <= 256 */
+uint8_t sector = 32; /* 1 <= sector <= 63 */
+
+uint8_t entry = 1; /* partition number: 1 <= entry <= 4 */
+uint8_t offset = 0; /* partition offset: 0 <= offset <= 64 */
+uint16_t type = 0x17; /* partition type: 0 <= type <= 255 */
+uint32_t id = 0; /* MBR: 0 <= id <= 0xFFFFFFFF(4294967296) */
+
+uint8_t hd0 = 0; /* 0 <= hd0 <= 2 */
+uint8_t partok = 0; /* 0 <= partok <= 1 */
+
+uint16_t ve[16];
+uint32_t catoffset = 0;
+uint32_t c = 0, cc = 0, cs = 0;
+
+/* boot catalogue parameters */
+uint32_t de_lba = 0;
+uint16_t de_seg = 0, de_count = 0, de_mbz2 = 0;
+uint8_t de_boot = 0, de_media = 0, de_sys = 0, de_mbz1 = 0;
+
+
+void
+usage(void)
+{
+ printf("Usage: %s [OPTIONS] <boot.iso>\n", prog);
+}
+
+
+void
+printh(void)
+{
+#define FMT "%-18s %s\n"
+
+ usage();
+
+ printf("\n");
+ printf("Options:\n");
+ printf(FMT, " -h <X>", "Number of default geometry heads");
+ printf(FMT, " -s <X>", "Number of default geometry sectors");
+ printf(FMT, " -e --entry", "Specify partition entry number (1-4)");
+ printf(FMT, " -o --offset", "Specify partition offset (default 0)");
+ printf(FMT, " -t --type", "Specify partition type (default 0x17)");
+ printf(FMT, " -i --id", "Specify MBR ID (default random)");
+
+ printf("\n");
+ printf(FMT, " --forcehd0", "Assume we are loaded as disk ID 0");
+ printf(FMT, " --ctrlhd0", "Assume disk ID 0 if the Ctrl key is pressed");
+ printf(FMT, " --partok", "Allow booting from within a partition");
+
+ printf("\n");
+ printf(FMT, " -? --help", "Display this help");
+ printf(FMT, " -v --verbose", "Display verbose output");
+ printf(FMT, " -V --version", "Display version information");
+
+ printf("\n");
+ printf("Report bugs to <pj.pandit@yahoo.co.in>\n");
+}
+
+
+int
+check_option(int argc, char *argv[])
+{
+ int n = 0, ind = 0;
+
+ const char optstr[] = ":h:s:e:o:t:i:fcp?vV";
+ struct option lopt[] = \
+ {
+ { "entry", required_argument, NULL, 'e' },
+ { "offset", required_argument, NULL, 'o' },
+ { "type", required_argument, NULL, 't' },
+ { "id", required_argument, NULL, 'i' },
+
+ { "forcehd0", no_argument, NULL, 'f' },
+ { "ctrlhd0", no_argument, NULL, 'c' },
+ { "partok", no_argument, NULL, 'p'},
+
+ { "help", no_argument, NULL, '?' },
+ { "verbose", no_argument, NULL, 'v' },
+ { "version", no_argument, NULL, 'V' },
+
+ { 0, 0, 0, 0 }
+ };
+
+ opterr = mode = 0;
+ while ((n = getopt_long_only(argc, argv, optstr, lopt, &ind)) != -1)
+ {
+ switch (n)
+ {
+ case 'h':
+ if (!sscanf(optarg, "%hu", &head) || head < 1 || head > 256)
+ errx(1, "invalid head: `%s', 1 <= head <= 256", optarg);
+ break;
+
+ case 's':
+ if (!sscanf(optarg, "%hhu", &sector) || sector < 1 || sector > 63)
+ errx(1, "invalid sector: `%s', 1 <= sector <= 63", optarg);
+ break;
+
+ case 'e':
+ if (!sscanf(optarg, "%hhu", &entry) || entry < 1 || entry > 4)
+ errx(1, "invalid entry: `%s', 1 <= entry <= 4", optarg);
+ break;
+
+ case 'o':
+ if (!sscanf(optarg, "%hhu", &offset) || offset > 64)
+ errx(1, "invalid offset: `%s', 0 <= offset <= 64", optarg);
+ break;
+
+ case 't':
+ if (!sscanf(optarg, "%hu", &type) || type > 255)
+ errx(1, "invalid type: `%s', 0 <= type <= 255", optarg);
+ break;
+
+ case 'i':
+ if (!sscanf(optarg, "%u", &id))
+ errx(1, "invalid id: `%s'", optarg);
+ break;
+
+ case 'f':
+ hd0 = 1;
+ break;
+
+ case 'c':
+ hd0 = 2;
+ break;
+
+ case 'p':
+ partok = 1;
+ break;
+
+ case 'v':
+ mode |= VERBOSE;
+ break;
+
+ case 'V':
+ printf("%s version %s\n", prog, VERSION);
+ exit(0);
+
+ case ':':
+ errx(1, "option `-%c' takes an argument", optopt);
+
+ default:
+ case '?':
+ if (optopt)
+ errx(1, "invalid option `-%c', see --help", optopt);
+
+ printh();
+ exit(0);
+ }
+ }
+
+ return optind;
+}
+
+
+uint16_t
+lendian_short(const uint16_t s)
+{
+ uint16_t r = 1;
+
+ if (*(uint8_t *)&r)
+ return s;
+
+ r = (s & 0x00FF) << 8 | (s & 0xFF00) >> 8;
+
+ return r;
+}
+
+
+uint32_t
+lendian_int(const uint32_t s)
+{
+ uint32_t r = 1;
+
+ if (*(uint8_t *)&r)
+ return s;
+
+ r = (s & 0x000000FF) << 24 | (s & 0xFF000000) >> 24
+ | (s & 0x0000FF00) << 8 | (s & 0x00FF0000) >> 8;
+
+ return r;
+}
+
+
+int
+check_banner(const uint8_t *buf)
+{
+ static const char banner[] = "\0CD001\1EL TORITO SPECIFICATION\0\0\0\0" \
+ "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0" \
+ "\0\0\0\0\0";
+
+ if (!buf || memcmp(buf, banner, sizeof(banner) - 1))
+ return 1;
+
+ buf += sizeof(banner) - 1;
+ memcpy(&catoffset, buf, sizeof(catoffset));
+
+ catoffset = lendian_int(catoffset);
+
+ return 0;
+}
+
+
+int
+check_catalogue(const uint8_t *buf)
+{
+ int i = 0;
+
+ for (i = 0, cs = 0; i < 16; i++)
+ {
+ ve[i] = 0;
+ memcpy(&ve[i], buf, sizeof(ve[i]));
+
+ ve[i] = lendian_short(ve[i]);
+
+ buf += 2;
+ cs += ve[i];
+
+ if (mode & VERBOSE)
+ printf("ve[%d]: %d, cs: %d\n", i, ve[i], cs);
+ }
+ if ((ve[0] != 0x0001) || (ve[15] != 0xAA55) || (cs & 0xFFFF))
+ return 1;
+
+ return 0;
+}
+
+
+int
+read_catalogue(const uint8_t *buf)
+{
+ memcpy(&de_boot, buf++, 1);
+ memcpy(&de_media, buf++, 1);
+
+ memcpy(&de_seg, buf, 2);
+ de_seg = lendian_short(de_seg);
+ buf += 2;
+
+ memcpy(&de_sys, buf++, 1);
+ memcpy(&de_mbz1, buf++, 1);
+
+ memcpy(&de_count, buf, 2);
+ de_count = lendian_short(de_count);
+ buf += 2;
+
+ memcpy(&de_lba, buf, 4);
+ de_lba = lendian_int(de_lba);
+ buf += 4;
+
+ memcpy(&de_mbz2, buf, 2);
+ de_mbz2 = lendian_short(de_mbz2);
+ buf += 2;
+
+ if (de_boot != 0x88 || de_media != 0
+ || (de_seg != 0 && de_seg != 0x7C0) || de_count != 4)
+ return 1;
+
+ return 0;
+}
+
+
+void
+display_catalogue(void)
+{
+ printf("de_boot: %hhu\n", de_boot);
+ printf("de_media: %hhu\n", de_media);
+ printf("de_seg: %hu\n", de_seg);
+ printf("de_sys: %hhu\n", de_sys);
+ printf("de_mbz1: %hhu\n", de_mbz1);
+ printf("de_count: %hu\n", de_count);
+ printf("de_lba: %u\n", de_lba);
+ printf("de_mbz2: %hu\n", de_mbz2);
+}
+
+
+int
+initialise_mbr(uint8_t *mbr)
+{
+ int i = 0;
+ uint32_t psize = 0, tmp = 0;
+ uint8_t ptype = 0, *rbm = mbr;
+ uint8_t bhead = 0, bsect = 0, bcyle = 0;
+ uint8_t ehead = 0, esect = 0, ecyle = 0;
+
+ extern unsigned char isohdpfx[][MBRSIZE];
+
+ memcpy(mbr, &isohdpfx[hd0 + 3 * partok], MBRSIZE);
+ mbr += MBRSIZE; /* offset 432 */
+
+ tmp = lendian_int(de_lba * 4);
+ memcpy(mbr, &tmp, sizeof(tmp));
+ mbr += sizeof(tmp); /* offset 436 */
+
+ tmp = 0;
+ memcpy(mbr, &tmp, sizeof(tmp));
+ mbr += sizeof(tmp); /* offset 440 */
+
+ tmp = lendian_int(id);
+ memcpy(mbr, &tmp, sizeof(tmp));
+ mbr += sizeof(tmp); /* offset 444 */
+
+ mbr[0] = '\0';
+ mbr[1] = '\0';
+ mbr += 2; /* offset 446 */
+
+ ptype = type;
+ psize = c * head * sector - offset;
+
+ bhead = (offset / sector) % head;
+ bsect = (offset % sector) + 1;
+ bcyle = offset / (head * sector);
+
+ bsect += (bcyle & 0x300) >> 2;
+ bcyle &= 0xFF;
+
+ ehead = head - 1;
+ esect = sector + (((cc - 1) & 0x300) >> 2);
+ ecyle = (cc - 1) & 0xFF;
+
+ for (i = 1; i <= 4; i++)
+ {
+ memset(mbr, 0, 16);
+ if (i == entry)
+ {
+ mbr[0] = 0x80;
+ mbr[1] = bhead;
+ mbr[2] = bsect;
+ mbr[3] = bcyle;
+ mbr[4] = ptype;
+ mbr[5] = ehead;
+ mbr[6] = esect;
+ mbr[7] = ecyle;
+
+ tmp = lendian_int(offset);
+ memcpy(&mbr[8], &tmp, sizeof(tmp));
+
+ tmp = lendian_int(psize);
+ memcpy(&mbr[12], &tmp, sizeof(tmp));
+ }
+ mbr += 16;
+ }
+ mbr[0] = 0x55;
+ mbr[1] = 0xAA;
+ mbr += 2;
+
+ return mbr - rbm;
+}
+
+
+void
+display_mbr(const uint8_t *mbr, size_t len)
+{
+ unsigned char c = 0;
+ unsigned int i = 0, j = 0;
+
+ printf("sizeof(MBR): %zu bytes\n", len);
+ for (i = 0; i < len; i++)
+ {
+ if (!(i % 16))
+ printf("%04d ", i);
+
+ if (!(i % 8))
+ printf(" ");
+
+ c = mbr[i];
+ printf("%02x ", c);
+
+ if (!((i + 1) % 16))
+ {
+ printf(" |");
+ for (; j <= i; j++)
+ printf("%c", isprint(mbr[j]) ? mbr[j] : '.');
+ printf("|\n");
+ }
+ }
+}
+
+
+int
+main(int argc, char *argv[])
+{
+ int i = 0;
+ FILE *fp = NULL;
+ struct stat isostat;
+ uint8_t *buf = NULL, *bufz = NULL;
+ int cylsize = 0, frac = 0, padding = 0;
+
+ prog = strcpy(alloca(strlen(argv[0]) + 1), argv[0]);
+ i = check_option(argc, argv);
+ argc -= i;
+ argv += i;
+
+ if (!argc)
+ {
+ usage();
+ return 1;
+ }
+ srand(time(NULL) << (getppid() << getpid()));
+
+ if (!(fp = fopen(argv[0], "r+")))
+ err(1, "could not open file `%s'", argv[0]);
+ if (fseek(fp, 17 * 2048, SEEK_SET))
+ err(1, "%s: seek error - 1", argv[0]);
+
+ bufz = buf = calloc(BUFSIZE, sizeof(char));
+ if (fread(buf, sizeof(char), BUFSIZE, fp) != BUFSIZE)
+ err(1, "%s", argv[0]);
+
+ if (check_banner(buf))
+ errx(1, "%s: could not find boot record", argv[0]);
+
+ if (mode & VERBOSE)
+ printf("catalogue offset: %d\n", catoffset);
+
+ if (fseek(fp, catoffset * 2048, SEEK_SET))
+ err(1, "%s: seek error - 2", argv[0]);
+
+ buf = bufz;
+ memset(buf, 0, BUFSIZE);
+ if (fread(buf, sizeof(char), BUFSIZE, fp) != BUFSIZE)
+ err(1, "%s", argv[0]);
+
+ if (check_catalogue(buf))
+ errx(1, "%s: invalid boot catalogue", argv[0]);
+
+ buf += sizeof(ve);
+ if (read_catalogue(buf))
+ errx(1, "%s: unexpected boot catalogue parameters", argv[0]);
+
+ if (mode & VERBOSE)
+ display_catalogue();
+
+ if (fseek(fp, (de_lba * 2048 + 0x40), SEEK_SET))
+ err(1, "%s: seek error - 3", argv[0]);
+
+ buf = bufz;
+ memset(buf, 0, BUFSIZE);
+ if (fread(buf, sizeof(char), 4, fp) != 4)
+ err(1, "%s", argv[0]);
+
+ if (memcmp(buf, "\xFB\xC0\x78\x70", 4))
+ errx(1, "%s: boot loader does not have an isolinux.bin hybrid " \
+ "signature. Note that isolinux-debug.bin does not support " \
+ "hybrid booting", argv[0]);
+
+ if (stat(argv[0], &isostat))
+ err(1, "%s", argv[0]);
+
+ cylsize = head * sector * 512;
+ frac = isostat.st_size % cylsize;
+ padding = (frac > 0) ? cylsize - frac : 0;
+
+ if (mode & VERBOSE)
+ printf("imgsize: %zu, padding: %d\n", (size_t)isostat.st_size, padding);
+
+ cc = c = (isostat.st_size + padding) / cylsize;
+ if (c > 1024)
+ {
+ warnx("Warning: more than 1024 cylinders: %d", c);
+ warnx("Not all BIOSes will be able to boot this device");
+ cc = 1024;
+ }
+
+ if (!id)
+ {
+ if (fseek(fp, 440, SEEK_SET))
+ err(1, "%s: seek error - 4", argv[0]);
+
+ if (fread(&id, 1, 4, fp) != 4)
+ err(1, "%s: read error", argv[0]);
+
+ id = lendian_int(id);
+ if (!id)
+ {
+ if (mode & VERBOSE)
+ printf("random ");
+ id = rand();
+ }
+ }
+ if (mode & VERBOSE)
+ printf("id: %u\n", id);
+
+ buf = bufz;
+ memset(buf, 0, BUFSIZE);
+ i = initialise_mbr(buf);
+
+ if (mode & VERBOSE)
+ display_mbr(buf, i);
+
+ if (fseek(fp, 0, SEEK_SET))
+ err(1, "%s: seek error - 5", argv[0]);
+
+ if (fwrite(buf, sizeof(char), i, fp) != (size_t)i)
+ err(1, "%s: write error - 1", argv[0]);
+
+ if (padding)
+ {
+ if (!(buf = realloc(buf, padding)))
+ err(1, "%s: could not re-size buffer", argv[0]);
+
+ if (fseek(fp, isostat.st_size, SEEK_SET))
+ err(1, "%s: seek error - 6", argv[0]);
+
+ memset(buf, 0, padding);
+ if (fwrite(buf, sizeof(char), padding, fp) != (size_t)padding)
+ err(1, "%s: write error - 2", argv[0]);
+ }
+
+ free(buf);
+ fclose(fp);
+
+ return 0;
+}
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