/* $OpenBSD: cd9660_eltorito.c,v 1.14 2018/11/20 01:13:15 yasuoka Exp $ */ /* $NetBSD: cd9660_eltorito.c,v 1.20 2013/01/28 21:03:28 christos Exp $ */ /* * Copyright (c) 2005 Daniel Watt, Walter Deignan, Ryan Gabrys, Alan * Perez-Rathke and Ram Vedam. All rights reserved. * * This code was written by Daniel Watt, Walter Deignan, Ryan Gabrys, * Alan Perez-Rathke and Ram Vedam. * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * THIS SOFTWARE IS PROVIDED BY DANIEL WATT, WALTER DEIGNAN, RYAN * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL DANIEL WATT, WALTER DEIGNAN, RYAN * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE,DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY * OF SUCH DAMAGE. */ #include "cd9660.h" #include "cd9660_eltorito.h" #include /* * Partition Status Information from Apple Tech Note 1189 */ #define APPLE_PS_VALID 0x00000001 /* Entry is valid */ #define APPLE_PS_ALLOCATED 0x00000002 /* Entry is allocated */ #define APPLE_PS_READABLE 0x00000010 /* Entry is readable */ #define APPLE_PS_WRITABLE 0x00000020 /* Entry is writable */ #ifdef DEBUG #define ELTORITO_DPRINTF(__x) printf __x #else #define ELTORITO_DPRINTF(__x) #endif static struct boot_catalog_entry *cd9660_init_boot_catalog_entry(void); static struct boot_catalog_entry *cd9660_boot_setup_validation_entry(char); static struct boot_catalog_entry *cd9660_boot_setup_default_entry( struct cd9660_boot_image *); static struct boot_catalog_entry *cd9660_boot_setup_section_head(char); static struct boot_catalog_entry *cd9660_boot_setup_validation_entry(char); #if 0 static u_char cd9660_boot_get_system_type(struct cd9660_boot_image *); #endif int cd9660_add_boot_disk(iso9660_disk *diskStructure, const char *boot_info) { struct stat stbuf; const char *mode_msg; char *temp; char *sysname; char *filename; struct cd9660_boot_image *new_image, *tmp_image; assert(boot_info != NULL); if (*boot_info == '\0') { warnx("Error: Boot disk information must be in the " "format 'system;filename'"); return 0; } /* First decode the boot information */ temp = estrdup(boot_info); sysname = temp; filename = strchr(sysname, ';'); if (filename == NULL) { warnx("supply boot disk information in the format " "'system;filename'"); free(temp); return 0; } *filename++ = '\0'; new_image = ecalloc(1, sizeof(*new_image)); new_image->loadSegment = 0; /* default for now */ /* Decode System */ if (strcmp(sysname, "i386") == 0) new_image->system = ET_SYS_X86; else if (strcmp(sysname, "powerpc") == 0) new_image->system = ET_SYS_PPC; else if (strcmp(sysname, "macppc") == 0) new_image->system = ET_SYS_MAC; else if (strcmp(sysname, "efi") == 0) new_image->system = ET_SYS_EFI; else { warnx("boot disk system must be " "i386, macppc, powerpc, or efi"); free(temp); free(new_image); return 0; } new_image->filename = estrdup(filename); free(temp); if (unveil(new_image->filename, "r") == -1) err(1, "unveil"); /* Get information about the file */ if (lstat(new_image->filename, &stbuf) == -1) err(1, "%s: lstat(\"%s\")", __func__, new_image->filename); switch (stbuf.st_size) { case 1440 * 1024: new_image->targetMode = ET_MEDIA_144FDD; mode_msg = "Assigned boot image to 1.44 emulation mode"; break; case 1200 * 1024: new_image->targetMode = ET_MEDIA_12FDD; mode_msg = "Assigned boot image to 1.2 emulation mode"; break; case 2880 * 1024: new_image->targetMode = ET_MEDIA_288FDD; mode_msg = "Assigned boot image to 2.88 emulation mode"; break; default: new_image->targetMode = ET_MEDIA_NOEM; mode_msg = "Assigned boot image to no emulation mode"; break; } new_image->size = stbuf.st_size; new_image->num_sectors = howmany(new_image->size, diskStructure->sectorSize) * howmany(diskStructure->sectorSize, 512); new_image->sector = -1; /* Bootable by default */ new_image->bootable = ET_BOOTABLE; /* Add boot disk */ /* Group images for the same platform together. */ TAILQ_FOREACH(tmp_image, &diskStructure->boot_images, image_list) { if (tmp_image->system != new_image->system) break; } if (tmp_image == NULL) TAILQ_INSERT_HEAD(&diskStructure->boot_images, new_image, image_list); else TAILQ_INSERT_AFTER(&diskStructure->boot_images, tmp_image, new_image, image_list); new_image->serialno = diskStructure->image_serialno++; /* TODO : Need to do anything about the boot image in the tree? */ diskStructure->is_bootable = 1; return 1; } int cd9660_eltorito_add_boot_option(iso9660_disk *diskStructure, const char *option_string, const char *value) { char *eptr; struct cd9660_boot_image *image; assert(option_string != NULL); /* Find the last image added */ TAILQ_FOREACH(image, &diskStructure->boot_images, image_list) { if (image->serialno + 1 == diskStructure->image_serialno) break; } if (image == NULL) errx(1, "Attempted to add boot option, " "but no boot images have been specified"); if (strcmp(option_string, "no-emul-boot") == 0) { image->targetMode = ET_MEDIA_NOEM; } else if (strcmp(option_string, "no-boot") == 0) { image->bootable = ET_NOT_BOOTABLE; } else if (strcmp(option_string, "hard-disk-boot") == 0) { image->targetMode = ET_MEDIA_HDD; } else if (strcmp(option_string, "boot-load-segment") == 0) { image->loadSegment = strtoul(value, &eptr, 16); if (eptr == value || *eptr != '\0' || errno != ERANGE) { warn("%s: strtoul", __func__); return 0; } } else { return 0; } return 1; } static struct boot_catalog_entry * cd9660_init_boot_catalog_entry(void) { return ecalloc(1, sizeof(struct boot_catalog_entry)); } static struct boot_catalog_entry * cd9660_boot_setup_validation_entry(char sys) { struct boot_catalog_entry *entry; boot_catalog_validation_entry *ve; int16_t checksum; unsigned char *csptr; size_t i; entry = cd9660_init_boot_catalog_entry(); entry->entry_type = ET_ENTRY_VE; ve = &entry->entry_data.VE; ve->header_id[0] = 1; ve->platform_id[0] = sys; ve->key[0] = 0x55; ve->key[1] = 0xAA; /* Calculate checksum */ checksum = 0; cd9660_721(0, ve->checksum); csptr = (unsigned char*)ve; for (i = 0; i < sizeof(*ve); i += 2) { checksum += (int16_t)csptr[i]; checksum += 256 * (int16_t)csptr[i + 1]; } checksum = -checksum; cd9660_721(checksum, ve->checksum); ELTORITO_DPRINTF(("%s: header_id %d, platform_id %d, key[0] %d, key[1] %d, " "checksum %04x\n", __func__, ve->header_id[0], ve->platform_id[0], ve->key[0], ve->key[1], checksum)); return entry; } static struct boot_catalog_entry * cd9660_boot_setup_default_entry(struct cd9660_boot_image *disk) { struct boot_catalog_entry *default_entry; boot_catalog_initial_entry *ie; default_entry = cd9660_init_boot_catalog_entry(); if (default_entry == NULL) return NULL; default_entry->entry_type = ET_ENTRY_IE; ie = &default_entry->entry_data.IE; ie->boot_indicator[0] = disk->bootable; ie->media_type[0] = disk->targetMode; cd9660_721(disk->loadSegment, ie->load_segment); ie->system_type[0] = disk->system; cd9660_721(disk->num_sectors, ie->sector_count); cd9660_731(disk->sector, ie->load_rba); ELTORITO_DPRINTF(("%s: boot indicator %d, media type %d, " "load segment %04x, system type %d, sector count %d, " "load rba %d\n", __func__, ie->boot_indicator[0], ie->media_type[0], disk->loadSegment, ie->system_type[0], disk->num_sectors, disk->sector)); return default_entry; } static struct boot_catalog_entry * cd9660_boot_setup_section_head(char platform) { struct boot_catalog_entry *entry; boot_catalog_section_header *sh; entry = cd9660_init_boot_catalog_entry(); if (entry == NULL) return NULL; entry->entry_type = ET_ENTRY_SH; sh = &entry->entry_data.SH; /* More by default. The last one will manually be set to 0x91 */ sh->header_indicator[0] = ET_SECTION_HEADER_MORE; sh->platform_id[0] = platform; sh->num_section_entries[0] = 0; return entry; } static struct boot_catalog_entry * cd9660_boot_setup_section_entry(struct cd9660_boot_image *disk) { struct boot_catalog_entry *entry; boot_catalog_section_entry *se; if ((entry = cd9660_init_boot_catalog_entry()) == NULL) return NULL; entry->entry_type = ET_ENTRY_SE; se = &entry->entry_data.SE; se->boot_indicator[0] = ET_BOOTABLE; se->media_type[0] = disk->targetMode; cd9660_721(disk->loadSegment, se->load_segment); cd9660_721(disk->num_sectors, se->sector_count); cd9660_731(disk->sector, se->load_rba); return entry; } #if 0 static u_char cd9660_boot_get_system_type(struct cd9660_boot_image *disk) { /* For hard drive booting, we need to examine the MBR to figure out what the partition type is */ return 0; } #endif /* * Set up the BVD, Boot catalog, and the boot entries, but do no writing */ int cd9660_setup_boot(iso9660_disk *diskStructure, int first_sector) { int sector; int used_sectors; int num_entries = 0; int catalog_sectors; struct boot_catalog_entry *x86_head, *mac_head, *ppc_head, *efi_head, *valid_entry, *default_entry, *temp, *head, **headp, *next; struct cd9660_boot_image *tmp_disk; headp = NULL; x86_head = mac_head = ppc_head = efi_head = NULL; /* If there are no boot disks, don't bother building boot information */ if (TAILQ_EMPTY(&diskStructure->boot_images)) return 0; /* Point to catalog: For now assume it consumes one sector */ ELTORITO_DPRINTF(("Boot catalog will go in sector %d\n", first_sector)); diskStructure->boot_catalog_sector = first_sector; cd9660_bothendian_dword(first_sector, diskStructure->boot_descriptor->boot_catalog_pointer); /* Step 1: Generate boot catalog */ /* Step 1a: Validation entry */ valid_entry = cd9660_boot_setup_validation_entry(ET_SYS_X86); if (valid_entry == NULL) return -1; /* * Count how many boot images there are, * and how many sectors they consume. */ num_entries = 1; used_sectors = 0; TAILQ_FOREACH(tmp_disk, &diskStructure->boot_images, image_list) { used_sectors += tmp_disk->num_sectors; /* One default entry per image */ num_entries++; } catalog_sectors = howmany(num_entries * 0x20, diskStructure->sectorSize); used_sectors += catalog_sectors; /* Populate sector numbers */ sector = first_sector + catalog_sectors; TAILQ_FOREACH(tmp_disk, &diskStructure->boot_images, image_list) { tmp_disk->sector = sector; sector += tmp_disk->num_sectors; } LIST_INSERT_HEAD(&diskStructure->boot_entries, valid_entry, ll_struct); /* Step 1b: Initial/default entry */ /* TODO : PARAM */ tmp_disk = TAILQ_FIRST(&diskStructure->boot_images); default_entry = cd9660_boot_setup_default_entry(tmp_disk); if (default_entry == NULL) { warnx("Error: memory allocation failed in cd9660_setup_boot"); return -1; } LIST_INSERT_AFTER(valid_entry, default_entry, ll_struct); /* Todo: multiple default entries? */ tmp_disk = TAILQ_NEXT(tmp_disk, image_list); temp = default_entry; /* If multiple boot images are given : */ while (tmp_disk != NULL) { /* Step 2: Section header */ switch (tmp_disk->system) { case ET_SYS_X86: headp = &x86_head; break; case ET_SYS_PPC: headp = &ppc_head; break; case ET_SYS_MAC: headp = &mac_head; break; case ET_SYS_EFI: headp = &efi_head; break; default: warnx("%s: internal error: unknown system type", __func__); return -1; } if (*headp == NULL) { head = cd9660_boot_setup_section_head(tmp_disk->system); if (head == NULL) { warnx("Error: memory allocation failed in " "cd9660_setup_boot"); return -1; } LIST_INSERT_AFTER(default_entry, head, ll_struct); *headp = head; } else head = *headp; head->entry_data.SH.num_section_entries[0]++; /* Step 2a: Section entry and extensions */ temp = cd9660_boot_setup_section_entry(tmp_disk); if (temp == NULL) { warn("%s: cd9660_boot_setup_section_entry", __func__); return -1; } while ((next = LIST_NEXT(head, ll_struct)) != NULL && next->entry_type == ET_ENTRY_SE) head = next; LIST_INSERT_AFTER(head, temp, ll_struct); tmp_disk = TAILQ_NEXT(tmp_disk, image_list); } /* TODO: Remaining boot disks when implemented */ return first_sector + used_sectors; } int cd9660_setup_boot_volume_descriptor(iso9660_disk *diskStructure, volume_descriptor *bvd) { boot_volume_descriptor *bvdData = (boot_volume_descriptor*)bvd->volumeDescriptorData; bvdData->boot_record_indicator[0] = ISO_VOLUME_DESCRIPTOR_BOOT; memcpy(bvdData->identifier, ISO_VOLUME_DESCRIPTOR_STANDARD_ID, 5); bvdData->version[0] = 1; memcpy(bvdData->boot_system_identifier, ET_ID, 23); memcpy(bvdData->identifier, ISO_VOLUME_DESCRIPTOR_STANDARD_ID, 5); diskStructure->boot_descriptor = (boot_volume_descriptor*) bvd->volumeDescriptorData; return 1; } static int cd9660_write_mbr_partition_entry(FILE *fd, int idx, off_t sector_start, off_t nsectors, int type) { uint8_t val; uint32_t lba; if (fseeko(fd, (off_t)(idx) * 16 + 0x1be, SEEK_SET) == -1) err(1, "fseeko"); val = 0x80; /* Bootable */ fwrite(&val, sizeof(val), 1, fd); val = 0xff; /* CHS begin */ fwrite(&val, sizeof(val), 1, fd); fwrite(&val, sizeof(val), 1, fd); fwrite(&val, sizeof(val), 1, fd); val = type; /* Part type */ fwrite(&val, sizeof(val), 1, fd); val = 0xff; /* CHS end */ fwrite(&val, sizeof(val), 1, fd); fwrite(&val, sizeof(val), 1, fd); fwrite(&val, sizeof(val), 1, fd); /* LBA extent */ lba = htole32(sector_start); fwrite(&lba, sizeof(lba), 1, fd); lba = htole32(nsectors); fwrite(&lba, sizeof(lba), 1, fd); return 0; } static int cd9660_write_apm_partition_entry(FILE *fd, int idx, int total_partitions, off_t sector_start, off_t nsectors, off_t sector_size, const char *part_name, const char *part_type) { uint32_t apm32, part_status; uint16_t apm16; part_status = APPLE_PS_VALID | APPLE_PS_ALLOCATED | APPLE_PS_READABLE | APPLE_PS_WRITABLE; if (fseeko(fd, (off_t)(idx + 1) * sector_size, SEEK_SET) == -1) err(1, "fseeko"); /* Signature */ apm16 = htobe16(0x504d); fwrite(&apm16, sizeof(apm16), 1, fd); apm16 = 0; fwrite(&apm16, sizeof(apm16), 1, fd); /* Total number of partitions */ apm32 = htobe32(total_partitions); fwrite(&apm32, sizeof(apm32), 1, fd); /* Bounds */ apm32 = htobe32(sector_start); fwrite(&apm32, sizeof(apm32), 1, fd); apm32 = htobe32(nsectors); fwrite(&apm32, sizeof(apm32), 1, fd); fwrite(part_name, strlen(part_name) + 1, 1, fd); fseek(fd, 32 - strlen(part_name) - 1, SEEK_CUR); fwrite(part_type, strlen(part_type) + 1, 1, fd); fseek(fd, 32 - strlen(part_type) - 1, SEEK_CUR); apm32 = 0; /* pmLgDataStart */ fwrite(&apm32, sizeof(apm32), 1, fd); /* pmDataCnt */ apm32 = htobe32(nsectors); fwrite(&apm32, sizeof(apm32), 1, fd); /* pmPartStatus */ apm32 = htobe32(part_status); fwrite(&apm32, sizeof(apm32), 1, fd); return 0; } int cd9660_write_boot(iso9660_disk *diskStructure, FILE *fd) { struct boot_catalog_entry *e; struct cd9660_boot_image *t; int apm_partitions = 0; int mbr_partitions = 0; /* write boot catalog */ if (fseeko(fd, (off_t)diskStructure->boot_catalog_sector * diskStructure->sectorSize, SEEK_SET) == -1) err(1, "fseeko"); LIST_FOREACH(e, &diskStructure->boot_entries, ll_struct) { /* * It doesnt matter which one gets written * since they are the same size */ fwrite(&(e->entry_data.VE), 1, 32, fd); } /* copy boot images */ TAILQ_FOREACH(t, &diskStructure->boot_images, image_list) { cd9660_copy_file(diskStructure, fd, t->sector, t->filename); if (t->system == ET_SYS_MAC) apm_partitions++; if (t->system == ET_SYS_PPC) mbr_partitions++; } /* some systems need partition tables as well */ if (mbr_partitions > 0) { uint16_t sig; fseek(fd, 0x1fe, SEEK_SET); sig = htole16(0xaa55); fwrite(&sig, sizeof(sig), 1, fd); mbr_partitions = 0; /* Write all partition entries */ TAILQ_FOREACH(t, &diskStructure->boot_images, image_list) { if (t->system != ET_SYS_PPC) continue; cd9660_write_mbr_partition_entry(fd, mbr_partitions++, t->sector * (diskStructure->sectorSize / 512), t->num_sectors * (diskStructure->sectorSize / 512), 0x41 /* PReP Boot */); } } if (apm_partitions > 0) { /* Write DDR and global APM info */ uint32_t apm32; uint16_t apm16; int total_parts; fseek(fd, 0, SEEK_SET); apm16 = htobe16(0x4552); fwrite(&apm16, sizeof(apm16), 1, fd); /* Device block size */ apm16 = htobe16(512); fwrite(&apm16, sizeof(apm16), 1, fd); /* Device block count */ apm32 = htobe32(diskStructure->totalSectors * (diskStructure->sectorSize / 512)); fwrite(&apm32, sizeof(apm32), 1, fd); /* Device type/id */ apm16 = htobe16(1); fwrite(&apm16, sizeof(apm16), 1, fd); fwrite(&apm16, sizeof(apm16), 1, fd); /* Count total needed entries */ total_parts = 2 + apm_partitions; /* Self + ISO9660 */ /* Write self-descriptor */ cd9660_write_apm_partition_entry(fd, 0, total_parts, 1, total_parts, 512, "Apple", "Apple_partition_map"); /* Write all partition entries */ apm_partitions = 0; TAILQ_FOREACH(t, &diskStructure->boot_images, image_list) { if (t->system != ET_SYS_MAC) continue; cd9660_write_apm_partition_entry(fd, 1 + apm_partitions++, total_parts, t->sector * (diskStructure->sectorSize / 512), t->num_sectors * (diskStructure->sectorSize / 512), 512, "CD Boot", "Apple_Bootstrap"); } /* Write ISO9660 descriptor, enclosing the whole disk */ cd9660_write_apm_partition_entry(fd, 2 + apm_partitions, total_parts, 0, diskStructure->totalSectors * (diskStructure->sectorSize / 512), 512, "ISO9660", "CD_ROM_Mode_1"); } return 0; }