/* * Program eltorito.c - Handle El Torito specific extensions to iso9660. * Written by Michael Fulbright (1996). Copyright 1996 RedHat Software, Incorporated This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program 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 this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include "config.h" #include "mkisofs.h" #include "iso9660.h" /* used by Win32 for opening binary file - not used by Unix */ #ifndef O_BINARY #define O_BINARY 0 #endif /* O_BINARY */ #undef MIN #define MIN(a, b) (((a) < (b))? (a): (b)) static struct eltorito_validation_entry valid_desc; static struct eltorito_defaultboot_entry default_desc; static struct eltorito_boot_descriptor gboot_desc; static int tvd_write __PR((FILE * outfile)); /* * Check for presence of boot catalog. If it does not exist then make it */ void FDECL1(init_boot_catalog, const char *, path) { int bcat; char * bootpath; /* filename of boot catalog */ char * buf; struct stat statbuf; bootpath = (char *) e_malloc(strlen(boot_catalog)+strlen(path)+2); strcpy(bootpath, path); if (bootpath[strlen(bootpath)-1] != '/') { strcat(bootpath,"/"); } strcat(bootpath, boot_catalog); /* * check for the file existing */ #ifdef DEBUG_TORITO fprintf(stderr,"Looking for boot catalog file %s\n",bootpath); #endif if (!stat_filter(bootpath, &statbuf)) { /* * make sure its big enough to hold what we want */ if (statbuf.st_size == 2048) { /* * printf("Boot catalog exists, so we do nothing\n"); */ free(bootpath); return; } else { fprintf(stderr, "A boot catalog exists and appears corrupted.\n"); fprintf(stderr, "Please check the following file: %s.\n",bootpath); fprintf(stderr, "This file must be removed before a bootable CD can be done.\n"); free(bootpath); exit(1); } } /* * file does not exist, so we create it * make it one CD sector long */ bcat = open(bootpath, O_WRONLY | O_CREAT | O_BINARY, S_IROTH | S_IRGRP | S_IRWXU ); if (bcat == -1) { fprintf(stderr, "Error creating boot catalog, exiting...\n"); perror(""); exit(1); } buf = (char *) e_malloc( 2048 ); write(bcat, buf, 2048); close(bcat); free(bootpath); } /* init_boot_catalog(... */ void FDECL1(get_torito_desc, struct eltorito_boot_descriptor *, boot_desc) { int bootcat; int checksum; unsigned char * checksum_ptr; struct directory_entry * de; struct directory_entry * de2; int i; int nsectors; memset(boot_desc, 0, sizeof(*boot_desc)); boot_desc->id[0] = 0; memcpy(boot_desc->id2, ISO_STANDARD_ID, sizeof(ISO_STANDARD_ID) - 1); boot_desc->version[0] = 1; memcpy(boot_desc->system_id, EL_TORITO_ID, sizeof(EL_TORITO_ID)); /* * search from root of iso fs to find boot catalog */ de2 = search_tree_file(root, boot_catalog); if (!de2) { fprintf(stderr,"Uh oh, I cant find the boot catalog!\n"); exit(1); } set_731(boot_desc->bootcat_ptr, (unsigned int) get_733(de2->isorec.extent)); /* * now adjust boot catalog * lets find boot image first */ de=search_tree_file(root, boot_image); if (!de) { fprintf(stderr,"Uh oh, I cant find the boot image!\n"); exit(1); } /* * we have the boot image, so write boot catalog information * Next we write out the primary descriptor for the disc */ memset(&valid_desc, 0, sizeof(valid_desc)); valid_desc.headerid[0] = 1; valid_desc.arch[0] = EL_TORITO_ARCH_x86; /* * we'll shove start of publisher id into id field, may get truncated * but who really reads this stuff! */ if (publisher) memcpy_max(valid_desc.id, publisher, MIN(23, strlen(publisher))); valid_desc.key1[0] = 0x55; valid_desc.key2[0] = 0xAA; /* * compute the checksum */ checksum=0; checksum_ptr = (unsigned char *) &valid_desc; for (i=0; isize + 511) & ~(511))/512; #ifdef APPLE_HYB /* NON-HFS change */ if (verbose > 0 ) #endif /* APPLE_HYB */ fprintf(stderr, "\nSize of boot image is %d sectors -> ", nsectors); /* * choose size of emulated floppy based on boot image size */ if (nsectors == 2880 ) { default_desc.boot_media[0] = EL_TORITO_MEDIA_144FLOP; #ifdef APPLE_HYB /* NON-HFS change */ if (verbose > 0 ) #endif /* APPLE_HYB */ fprintf(stderr, "Emulating a 1.44 meg floppy\n"); } else if (nsectors == 5760 ) { default_desc.boot_media[0] = EL_TORITO_MEDIA_288FLOP; #ifdef APPLE_HYB /* NON-HFS change */ if (verbose > 0 ) #endif /* APPLE_HYB */ fprintf(stderr,"Emulating a 2.88 meg floppy\n"); } else if (nsectors == 2400 ) { default_desc.boot_media[0] = EL_TORITO_MEDIA_12FLOP; #ifdef APPLE_HYB /* NON-HFS change */ if (verbose > 0 ) #endif /* APPLE_HYB */ fprintf(stderr,"Emulating a 1.2 meg floppy\n"); } else if (nsectors == 4 ) { default_desc.boot_media[0] = EL_TORITO_MEDIA_NOEMUL; #ifdef APPLE_HYB /* NON-HFS change */ if (verbose > 0 ) #endif /* APPLE_HYB */ fprintf(stderr,"No-emulation CD boot sector\n"); } else { fprintf(stderr,"\nError - boot image is not the an allowable size.\n"); exit(1); } /* * FOR NOW LOAD 1 SECTOR, JUST LIKE FLOPPY BOOT, unless it's no-emulation * boot. */ if (default_desc.boot_media[0] != EL_TORITO_MEDIA_NOEMUL) nsectors = 1; set_721(default_desc.nsect, (unsigned int) nsectors ); #ifdef DEBUG_TORITO fprintf(stderr,"Extent of boot images is %d\n",get_733(de->isorec.extent)); #endif set_731(default_desc.bootoff, (unsigned int) get_733(de->isorec.extent)); /* * now write it to disk */ bootcat = open(de2->whole_name, O_RDWR | O_BINARY); if (bootcat == -1) { fprintf(stderr,"Error opening boot catalog for update.\n"); perror(""); exit(1); } /* * write out */ write(bootcat, &valid_desc, 32); write(bootcat, &default_desc, 32); close(bootcat); } /* get_torito_desc(... */ /* * Function to write the EVD for the disc. */ static int FDECL1(tvd_write, FILE *, outfile) { /* * Next we write out the boot volume descriptor for the disc */ get_torito_desc(&gboot_desc); xfwrite(&gboot_desc, 1, 2048, outfile); last_extent_written ++; return 0; } struct output_fragment torito_desc = {NULL, oneblock_size, NULL, tvd_write};