makefs/cd9660/cd9660_eltorito.c

/*	$NetBSD: cd9660_eltorito.c,v 1.1 2005/08/13 01:53:01 fvdl 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 <sys/cdefs.h>
#if defined(__RCSID) && !defined(__lint)
__RCSID("$NetBSD: cd9660_eltorito.c,v 1.1 2005/08/13 01:53:01 fvdl Exp $");
#endif  /* !__lint */

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(boot_info)
const char * boot_info;
{
	struct stat stbuf;
	char *temp;
	char *sysname;
	char *filename;
	struct cd9660_boot_image *new_image,*tmp_image;

	assert(boot_info != NULL);

	/* First decode the boot information */
	temp = malloc(strlen(boot_info) + 1);
	if (temp == NULL) {
		warnx("Error initializing memory in cd9660_add_boot_disk");
		return 0;
	}

	strcpy(temp, boot_info);

	sysname = temp;
	if (*sysname == '\0') {
		warnx("Error: Boot disk information must be in the "
		      "format 'system;filename'");
		return 0;
	}

	filename = strchr(sysname, ';');
	if (filename == NULL) {
		warnx("Error: Boot disk information must be in the "
		       "format 'system;filename'");
		return 0;
	}

	*filename = '\0';
	filename++;

	printf("Found bootdisk with system %s, and filename %s\n",
	    sysname, filename);
	new_image = malloc(sizeof(struct cd9660_boot_image));
	if (new_image == NULL) {
		warnx("Error initializing memory in cd9660_add_boot_disk");
		return 0;
	}
	new_image->loadSegment = 0;	/* default for now */

	/* Decode System */
	if (strcmp(sysname,"x86") == 0)
		new_image->system = ET_SYS_X86;
	else if (strcmp(sysname,"ppc") == 0)
		new_image->system = ET_SYS_PPC;
	else if (strcmp(sysname,"mac") == 0)
		new_image->system = ET_SYS_MAC;
	else {
		warnx("Error: Boot disk system must be one of the "
		      "following: x86, ppc, mac");
		return 0;
	}

	new_image->filename = malloc(strlen(filename) + 1);
	if (new_image->filename == NULL) {
		warnx("Error initializing memory in cd9660_add_boot_disk");
		return 0;
	}

	strcpy(new_image->filename, filename);
	free(temp);

	/* Get information about the file */
	if (lstat(new_image->filename, &stbuf) == -1)
		errx(1, "Can't lstat `%s'", new_image->filename);

	switch (stbuf.st_size) {
	case 1440 * 1024:
		new_image->targetMode = ET_MEDIA_144FDD;
		printf("Assigned boot image to 1.44 emulation mode\n");
		break;
	case 1200 * 1024:
		new_image->targetMode = ET_MEDIA_12FDD;
		printf("Assigned boot image to 1.2 emulation mode\n");
		break;
	case 2880 * 1024:
		new_image->targetMode = ET_MEDIA_288FDD;
		printf("Assigned boot image to 2.88 emulation mode\n");
		break;
	default:
		new_image->targetMode = ET_MEDIA_NOEM;
		printf("Assigned boot image to no emulation mode\n");
		break;
	}

	new_image->size = stbuf.st_size;
	new_image->num_sectors =
		CD9660_BLOCKS(diskStructure.sectorSize, new_image->size);
	printf("New image has size %i, uses %i sectors of size %i\n",
	    new_image->size, new_image->num_sectors, diskStructure.sectorSize);
	new_image->sector = -1;
	/* Bootable by default */
	new_image->bootable = ET_BOOTABLE;
	/* Add boot disk */

	if (diskStructure.boot_images.lh_first == NULL) {
		LIST_INSERT_HEAD(&(diskStructure.boot_images), new_image,
		    image_list);
	} else {
		tmp_image = diskStructure.boot_images.lh_first;
		while (tmp_image->image_list.le_next != 0
			&& tmp_image->image_list.le_next->system !=
			    new_image->system) {
			tmp_image = tmp_image->image_list.le_next;
		}
		LIST_INSERT_AFTER(tmp_image, new_image,image_list);
	}

	/* TODO : Need to do anything about the boot image in the tree? */
	diskStructure.is_bootable = 1;

	return 1;
}

int
cd9660_eltorito_add_boot_option(const char *option_string, const char* value)
{
	struct cd9660_boot_image *image;

	assert(option_string != NULL);

	/* Find the last image added */
	image = diskStructure.boot_images.lh_first;
	if (image == NULL)
		errx(1, "Attempted to add boot option, but no boot images "
			"have been specified");

	while (image->image_list.le_next != NULL)
		image = image->image_list.le_next;

	/* TODO : These options are NOT copied yet */
	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-size") == 0) {
		/* TODO */
	} else if (strcmp(option_string, "boot-load-segment") == 0) {
		/* TODO */
	} else {
		return 0;
	}
	return 1;
}

static struct boot_catalog_entry *
cd9660_init_boot_catalog_entry(void)
{
	struct boot_catalog_entry *temp;

	temp = malloc(sizeof(struct boot_catalog_entry));
	return temp;
}

static struct boot_catalog_entry *
cd9660_boot_setup_validation_entry(char sys)
{
	struct boot_catalog_entry *validation_entry;
	int16_t checksum;
	unsigned char *csptr;
	int i;

	validation_entry = cd9660_init_boot_catalog_entry();

	if (validation_entry == NULL) {
		warnx("Error: memory allocation failed in "
		      "cd9660_boot_setup_validation_entry");
		return 0;
	}
	validation_entry->entry_data.VE.header_id[0] = 1;
	validation_entry->entry_data.VE.platform_id[0] = sys;
	validation_entry->entry_data.VE.key[0] = 0x55;
	validation_entry->entry_data.VE.key[1] = 0xAA;

	/* Calculate checksum */
	checksum = 0;
	cd9660_721(0, validation_entry->entry_data.VE.checksum);
	csptr = (unsigned char*) &(validation_entry->entry_data.VE);
	for (i = 0; i < sizeof (boot_catalog_validation_entry); i += 2) {
		checksum += (int16_t) csptr[i];
		checksum += ((int16_t) csptr[i + 1]) * 256;
	}
	checksum = -checksum;
	cd9660_721(checksum, validation_entry->entry_data.VE.checksum);

	return validation_entry;
}

static struct boot_catalog_entry *
cd9660_boot_setup_default_entry(struct cd9660_boot_image *disk)
{
	struct boot_catalog_entry *default_entry;

	default_entry = cd9660_init_boot_catalog_entry();
	if (default_entry == NULL)
		return NULL;

	cd9660_721(1, default_entry->entry_data.IE.sector_count);

	default_entry->entry_data.IE.boot_indicator[0] = disk->bootable;
	default_entry->entry_data.IE.media_type[0] = disk->targetMode;
	cd9660_721(disk->loadSegment,
	    default_entry->entry_data.IE.load_segment);
	default_entry->entry_data.IE.system_type[0] = disk->system;
	cd9660_721(1, default_entry->entry_data.IE.sector_count);
	cd9660_731(disk->sector, default_entry->entry_data.IE.load_rba);

	return default_entry;
}

static struct boot_catalog_entry *
cd9660_boot_setup_section_head(char platform)
{
	struct boot_catalog_entry *sh;

	sh = cd9660_init_boot_catalog_entry();
	if (sh == NULL)
		return NULL;
	/* More by default. The last one will manually be set to 0x91 */
	sh->entry_data.SH.header_indicator[0] = ET_SECTION_HEADER_MORE;
	sh->entry_data.SH.platform_id[0] = platform;
	sh->entry_data.SH.num_section_entries[0] = 0;
	return sh;
}

static struct boot_catalog_entry *
cd9660_boot_setup_section_entry(struct cd9660_boot_image *disk)
{
	struct boot_catalog_entry *entry;

	if ((entry = cd9660_init_boot_catalog_entry()) == NULL)
		return NULL;

	entry->entry_data.SE.boot_indicator[0] = ET_BOOTABLE;
	entry->entry_data.SE.media_type[0] = disk->targetMode;
	cd9660_721(disk->loadSegment, entry->entry_data.SE.load_segment);
	cd9660_721(1, entry->entry_data.SE.sector_count);

	cd9660_731(disk->sector,entry->entry_data.IE.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(int first_sector)
{
	int need_head;
	int sector;
	int used_sectors;
	int num_entries = 0;
	int catalog_sectors;
	struct boot_catalog_entry *x86_head, *mac_head, *ppc_head,
		*last_x86, *last_ppc, *last_mac, *last_head,
		*valid_entry, *default_entry, *temp, *head_temp;
	struct cd9660_boot_image *tmp_disk;

	head_temp = NULL;
	need_head = 0;
	x86_head = mac_head = ppc_head =
		last_x86 = last_ppc = last_mac = last_head = NULL;

	/* If there are no boot disks, don't bother building boot information */
	if ((tmp_disk = diskStructure.boot_images.lh_first) == NULL)
		return 0;

	/* Point to catalog: For now assume it consumes one sector */
	printf("Boot catalog will go in sector %i\n",first_sector);
	diskStructure.boot_catalog_sector = first_sector;
	cd9660_bothendian_dword(first_sector,
		diskStructure.boot_descriptor->boot_catalog_pointer);
	sector = first_sector +1;

	/* 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;

	for (tmp_disk = diskStructure.boot_images.lh_first; tmp_disk != NULL;
		tmp_disk = tmp_disk->image_list.le_next) {
		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;

	printf("boot: there will be %i entries consuming %i sectors. "
	       "Catalog is %i sectors\n", num_entries, used_sectors,
		catalog_sectors);

	/* Populate sector numbers */
	sector = first_sector + catalog_sectors;
	for (tmp_disk = diskStructure.boot_images.lh_first; tmp_disk != NULL;
		tmp_disk = tmp_disk->image_list.le_next) {
		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 = diskStructure.boot_images.lh_first;
	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 = tmp_disk->image_list.le_next;

	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:
			need_head = (x86_head == NULL);
			if (!need_head)
				head_temp = x86_head;
			break;
		case ET_SYS_PPC:
			need_head = (ppc_head == NULL);
			if (!need_head)
				head_temp = ppc_head;
			break;
		case ET_SYS_MAC:
			need_head = (mac_head == NULL);
			if (!need_head)
				head_temp = mac_head;
			break;
		}

		if (need_head) {
			head_temp =
			    cd9660_boot_setup_section_head(tmp_disk->system);
			if (head_temp == NULL) {
				warnx("Error: memory allocation failed in "
				      "cd9660_setup_boot");
				return -1;
			}
			LIST_INSERT_AFTER(default_entry,head_temp, ll_struct);
		}
		head_temp->entry_data.SH.num_section_entries[0]++;

		/* Step 2a: Section entry and extensions */
		temp = cd9660_boot_setup_section_entry(tmp_disk);
		if (temp == NULL) {
			warnx("Error: memory allocation failed in "
			      "cd9660_setup_boot");
			return -1;
		}

		while (head_temp->ll_struct.le_next != NULL) {
			if (head_temp->ll_struct.le_next->entry_type
			    != ET_ENTRY_SE)
				break;
			head_temp = head_temp->ll_struct.le_next;
		}

		LIST_INSERT_AFTER(head_temp,temp, ll_struct);
		tmp_disk = tmp_disk->image_list.le_next;
	}

	/* TODO: Remaining boot disks when implemented */

	return first_sector + used_sectors;
}

int
cd9660_setup_boot_volume_descritpor(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;
}

int
cd9660_write_boot(FILE *fd)
{
	struct boot_catalog_entry *e;
	struct cd9660_boot_image *t;

	/* write boot catalog */
	fseek(fd, diskStructure.boot_catalog_sector * diskStructure.sectorSize,
	    SEEK_SET);

	printf("Writing boot catalog to sector %i\n",
	    diskStructure.boot_catalog_sector);
	for (e = diskStructure.boot_entries.lh_first; e != NULL;
	     e = e->ll_struct.le_next) {
		printf("Writing catalog entry of type %i\n", e->entry_type);
		/*
		 * It doesnt matter which one gets written
		 * since they are the same size
		 */
		fwrite(&(e->entry_data.VE), 1, 32, fd);
	}
	printf("Finished writing boot catalog\n");

	/* copy boot images */
	for (t = diskStructure.boot_images.lh_first; t != NULL;
	     t = t->image_list.le_next) {
		printf("Writing boot image from %s to sectors %i\n",
		    t->filename,t->sector);
		cd9660_copy_file(fd, t->sector, t->filename);
	}

	return 0;
}