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/*
* Guillaume Cottenceau (gc)
*
* Copyright 2000 Mandriva
*
* This software may be freely redistributed under the terms of the GNU
* public license.
*
* 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.
*
*/
/*
* Portions from Erik Troan (ewt@redhat.com)
*
* Copyright 1996 Red Hat Software
*
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <libgen.h>
#include "stage1.h"
#include "frontend.h"
#include "modules.h"
#include "probing.h"
#include "log.h"
#include "mount.h"
#include "automatic.h"
#include "disk.h"
#include "partition.h"
struct partition_detection_anchor {
off_t offset;
const char * anchor;
};
static int seek_and_compare(int fd, struct partition_detection_anchor anch)
{
char buf[500];
size_t count;
if (lseek(fd, anch.offset, SEEK_SET) == (off_t)-1) {
log_perror("seek failed");
return -1;
}
count = read(fd, buf, strlen(anch.anchor));
if (count != strlen(anch.anchor)) {
log_perror("read failed");
return -1;
}
buf[count] = '\0';
if (strcmp(anch.anchor, buf))
return 1;
return 0;
}
static const char * detect_partition_type(char * dev)
{
struct partition_detection_info {
const char * name;
struct partition_detection_anchor anchor0;
struct partition_detection_anchor anchor1;
struct partition_detection_anchor anchor2;
};
struct partition_detection_info partitions_signatures[] = {
{ "Linux Swap", { 4086, "SWAP-SPACE" }, { 0, NULL }, { 0, NULL } },
{ "Linux Swap", { 4086, "SWAPSPACE2" }, { 0, NULL }, { 0, NULL } },
{ "Ext4", { 0x438, "\x53\xEF" }, { 0, NULL }, { 0, NULL } },
{ "ReiserFS", { 0x10034, "ReIsErFs" }, { 0, NULL }, { 0, NULL } },
{ "ReiserFS", { 0x10034, "ReIsEr2Fs" }, { 0, NULL }, { 0, NULL } },
{ "XFS", { 0, "XFSB" }, { 0x200, "XAGF" }, { 0x400, "XAGI" } },
{ "JFS", { 0x8000, "JFS1" }, { 0, NULL }, { 0, NULL } },
{ "NTFS", { 0x1FE, "\x55\xAA" }, { 0x3, "NTFS" }, { 0, NULL } },
{ "FAT32", { 0x1FE, "\x55\xAA" }, { 0x52, "FAT32" }, { 0, NULL } },
{ "FAT", { 0x1FE, "\x55\xAA" }, { 0x36, "FAT" }, { 0, NULL } },
{ "Linux LVM", { 0, "HM\1\0" }, { 0, NULL }, { 0, NULL } }
};
int partitions_signatures_nb = sizeof(partitions_signatures) / sizeof(struct partition_detection_info);
int i;
int fd;
const char *part_type = NULL;
char device_fullname[50];
strcpy(device_fullname, "/dev/");
strcat(device_fullname, dev);
if (ensure_dev_exists(device_fullname))
return NULL;
log_message("guessing type of %s", device_fullname);
if ((fd = open(device_fullname, O_RDONLY, 0)) < 0) {
log_perror("open");
return NULL;
}
for (i=0; i<partitions_signatures_nb; i++) {
int results = seek_and_compare(fd, partitions_signatures[i].anchor0);
if (results == -1)
goto detect_partition_type_end;
if (results == 1)
continue;
if (!partitions_signatures[i].anchor1.anchor)
goto detect_partition_found_it;
results = seek_and_compare(fd, partitions_signatures[i].anchor1);
if (results == -1)
goto detect_partition_type_end;
if (results == 1)
continue;
if (!partitions_signatures[i].anchor2.anchor)
goto detect_partition_found_it;
results = seek_and_compare(fd, partitions_signatures[i].anchor2);
if (results == -1)
goto detect_partition_type_end;
if (results == 1)
continue;
detect_partition_found_it:
part_type = partitions_signatures[i].name;
break;
}
detect_partition_type_end:
close(fd);
return part_type;
}
int list_partitions(char * dev_name, char ** parts, char ** comments)
{
int major, minor, blocks;
char name[100];
FILE * f;
int i = 0;
char buf[512];
if (!(f = fopen("/proc/partitions", "rb")) || !fgets(buf, sizeof(buf), f) || !fgets(buf, sizeof(buf), f)) {
log_perror(dev_name);
return 1;
}
while (fgets(buf, sizeof(buf), f)) {
memset(name, 0, sizeof(name));
sscanf(buf, " %d %d %d %s", &major, &minor, &blocks, name);
if ((strstr(name, dev_name) == name) && (blocks > 1) && (name[strlen(dev_name)] != '\0')) {
const char * partition_type = detect_partition_type(name);
parts[i] = strdup(name);
comments[i] = (char *) malloc(sizeof(char) * 100);
sprintf(comments[i], "size: %d Mbytes", blocks >> 10);
if (partition_type) {
strcat(comments[i], ", type: ");
strcat(comments[i], partition_type);
}
i++;
}
}
parts[i] = NULL;
fclose(f);
return 0;
}
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