freebsd-nq/lib/libdisk/disk.c

/*
 * ----------------------------------------------------------------------------
 * "THE BEER-WARE LICENSE" (Revision 42):
 * <phk@login.dknet.dk> wrote this file.  As long as you retain this notice you
 * can do whatever you want with this stuff. If we meet some day, and you think
 * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
 * ----------------------------------------------------------------------------
 *
 * $FreeBSD$
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <err.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/disklabel.h>
#include <sys/diskslice.h>
#include "libdisk.h"

#define DOSPTYP_EXTENDED        5
#define DOSPTYP_ONTRACK         84

const char *chunk_n[] = {
	"whole",
	"unknown",
	"fat",
	"freebsd",
	"extended",
	"part",
	"unused",
	NULL
};

struct disk *
Open_Disk(const char *name)
{
	return Int_Open_Disk(name,0);
}

struct disk *
Int_Open_Disk(const char *name, u_long size)
{
	int i,fd;
	struct diskslices ds;
	struct disklabel dl;
	char device[64];
	struct disk *d;
	struct dos_partition *dp;
	void *p;
	u_long offset = 0;

	strcpy(device,"/dev/r");
	strcat(device,name);

	d = (struct disk *)malloc(sizeof *d);
	if(!d) err(1,"malloc failed");
	memset(d,0,sizeof *d);

	fd = open(device,O_RDONLY);
	if (fd < 0) {
#ifdef DEBUG
		warn("open(%s) failed",device);
#endif
		return 0;
	}

	memset(&dl,0,sizeof dl);
	ioctl(fd,DIOCGDINFO,&dl);
	i = ioctl(fd,DIOCGSLICEINFO,&ds);
	if (i < 0) {
#ifdef DEBUG
		warn("DIOCGSLICEINFO(%s) failed",device);
#endif
		close(fd);
		return 0;
	}

#ifdef DEBUG
	for(i=0;i<ds.dss_nslices;i++)
		if(ds.dss_slices[i].ds_openmask)
			printf("  open(%d)=0x%2x",
				i,ds.dss_slices[i].ds_openmask);
	printf("\n");
#endif

	if (!size)
		size = ds.dss_slices[WHOLE_DISK_SLICE].ds_size;

	p = read_block(fd,0);
	dp = (struct dos_partition*)(p+DOSPARTOFF);
	for(i=0;i<NDOSPART;i++) {
		if (dp->dp_start >= size) continue;
		if (dp->dp_start+dp->dp_size >= size) continue;
		if (!dp->dp_size) continue;

		if (dp->dp_typ == DOSPTYP_ONTRACK) {
			d->flags |= DISK_ON_TRACK;
			offset = 63;
		}

	}
	free(p);

	d->bios_sect = dl.d_nsectors;
	d->bios_hd = dl.d_ntracks;

	d->name = strdup(name);


	if (dl.d_ntracks && dl.d_nsectors)
		d->bios_cyl = size/(dl.d_ntracks*dl.d_nsectors);

	if (Add_Chunk(d, -offset, size, name, whole, 0, 0))
#ifdef DEBUG
		warn("Failed to add 'whole' chunk");
#else
		{}
#endif

	for(i=BASE_SLICE;i<ds.dss_nslices;i++) {
		char sname[20];
		chunk_e ce;
		u_long flags=0;
		int subtype=0;
		if (! ds.dss_slices[i].ds_size)
			continue;
		ds.dss_slices[i].ds_offset -= offset;
		sprintf(sname,"%ss%d",name,i-1);
		subtype = ds.dss_slices[i].ds_type;
		switch (ds.dss_slices[i].ds_type) {
			case 0xa5:
				ce = freebsd;
				break;
			case 0x1:
			case 0x6:
			case 0x4:
				ce = fat;
				break;
			case DOSPTYP_EXTENDED:
				ce = extended;
				break;
			default:
				ce = unknown;
				break;
		}
		if (Add_Chunk(d, ds.dss_slices[i].ds_offset,
			ds.dss_slices[i].ds_size, sname, ce, subtype, flags))
#ifdef DEBUG
			warn("failed to add chunk for slice %d", i - 1);
#else
			{}
#endif

		if (ds.dss_slices[i].ds_type != 0xa5)
			continue;
		{
		struct disklabel dl;
		char pname[20];
		int j,k;

		strcpy(pname,"/dev/r");
		strcat(pname,sname);
		j = open(pname,O_RDONLY);
		if (j < 0) {
#ifdef DEBUG
			warn("open(%s)",pname);
#endif
			continue;
		}
		k = ioctl(j,DIOCGDINFO,&dl);
		if (k < 0) {
#ifdef DEBUG
			warn("ioctl(%s,DIOCGDINFO)",pname);
#endif
			close(j);
			continue;
		}
		close(j);

		for(j=0; j <= dl.d_npartitions; j++) {
			if (j == RAW_PART)
				continue;
			if (j == 3)
				continue;
			if (j == dl.d_npartitions) {
				j = 3;
				dl.d_npartitions=0;
			}
			if (!dl.d_partitions[j].p_size)
				continue;
			if (dl.d_partitions[j].p_size +
			    dl.d_partitions[j].p_offset >
			    ds.dss_slices[i].ds_size)
				continue;
			sprintf(pname,"%s%c",sname,j+'a');
			if (Add_Chunk(d,
				dl.d_partitions[j].p_offset +
				ds.dss_slices[i].ds_offset,
				dl.d_partitions[j].p_size,
				pname,part,
				dl.d_partitions[j].p_fstype,
				0) && j != 3)
#ifdef DEBUG
				warn(
			"Failed to add chunk for partition %c [%lu,%lu]",
			j + 'a',dl.d_partitions[j].p_offset,
			dl.d_partitions[j].p_size);
#else
				{}
#endif
		}
		}
	}
	close(fd);
	Fixup_Names(d);
	Bios_Limit_Chunk(d->chunks,1024*d->bios_hd*d->bios_sect);
	return d;
}

void
Debug_Disk(struct disk *d)
{
	printf("Debug_Disk(%s)",d->name);
	printf("  flags=%lx",d->flags);
#if 0
	printf("  real_geom=%lu/%lu/%lu",d->real_cyl,d->real_hd,d->real_sect);
#endif
	printf("  bios_geom=%lu/%lu/%lu = %lu\n",
		d->bios_cyl,d->bios_hd,d->bios_sect,
		d->bios_cyl*d->bios_hd*d->bios_sect);
	printf("  boot1=%p, boot2=%p, bootmgr=%p\n",
		d->boot1,d->boot2,d->bootmgr);
	Debug_Chunk(d->chunks);
}

void
Free_Disk(struct disk *d)
{
	if(d->chunks) Free_Chunk(d->chunks);
	if(d->name) free(d->name);
	if(d->bootmgr) free(d->bootmgr);
	if(d->boot1) free(d->boot1);
	if(d->boot2) free(d->boot2);
	free(d);
}

struct disk *
Clone_Disk(struct disk *d)
{
	struct disk *d2;

	d2 = (struct disk*) malloc(sizeof *d2);
	if(!d2) err(1,"malloc failed");
	*d2 = *d;
	d2->name = strdup(d2->name);
	d2->chunks = Clone_Chunk(d2->chunks);
	if(d2->bootmgr) {
		d2->bootmgr = malloc(DOSPARTOFF);
		memcpy(d2->bootmgr,d->bootmgr,DOSPARTOFF);
	}
	if(d2->boot1) {
		d2->boot1 = malloc(512);
		memcpy(d2->boot1,d->boot1,512);
	}
	if(d2->boot2) {
		d2->boot2 = malloc(512*15);
		memcpy(d2->boot2,d->boot2,512*15);
	}
	return d2;
}

#if 0
void
Collapse_Disk(struct disk *d)
{

	while(Collapse_Chunk(d,d->chunks))
		;
}
#endif

static char * device_list[] = {"wd","sd","od",0};

char **
Disk_Names()
{
    int i,j,k;
    char disk[25];
    char diskname[25];
    struct stat st;
    struct diskslices ds;
    int fd;
    static char **disks;

    disks = malloc(sizeof *disks * (1 + MAX_NO_DISKS));
    memset(disks,0,sizeof *disks * (1 + MAX_NO_DISKS));
    k = 0;
	for (j = 0; device_list[j]; j++) {
		for (i = 0; i < 10; i++) {
			sprintf(diskname, "%s%d", device_list[j], i);
			sprintf(disk, "/dev/r%s", diskname);
			if (stat(disk, &st) || !(st.st_mode & S_IFCHR))
				continue;
			if ((fd = open(disk, O_RDWR)) == -1)
				continue;
			if (ioctl(fd, DIOCGSLICEINFO, &ds) == -1) {
				close(fd);
				continue;
			}
			disks[k++] = strdup(diskname);
			if(k == MAX_NO_DISKS)
				return disks;
		}
	}
	return disks;
}

void
Set_Boot_Mgr(struct disk *d, const u_char *b)
{
	if (d->bootmgr)
		free(d->bootmgr);
	if (!b) {
		d->bootmgr = 0;
	} else {
		d->bootmgr = malloc(DOSPARTOFF);
		if(!d->bootmgr) err(1,"malloc failed");
		memcpy(d->bootmgr,b,DOSPARTOFF);
	}
}

void
Set_Boot_Blocks(struct disk *d, const u_char *b1, const u_char *b2)
{
	if (d->boot1) free(d->boot1);
	d->boot1 = malloc(512);
	if(!d->boot1) err(1,"malloc failed");
	memcpy(d->boot1,b1,512);
	if (d->boot2) free(d->boot2);
	d->boot2 = malloc(15*512);
	if(!d->boot2) err(1,"malloc failed");
	memcpy(d->boot2,b2,15*512);
}