source: bootcd/isolinux/syslinux-6.03/com32/gpllib/disk/mbrs.c

Last change on this file was e16e8f2, checked in by Edwin Eefting <edwin@datux.nl>, 3 years ago

bootstuff
  • Property mode set to 100644
File size: 3.9 KB
Line 
1/* ----------------------------------------------------------------------- *
2 *
3 *   Copyright 2009 Pierre-Alexandre Meyer
4 *
5 *   This file is part of Syslinux, and is made available under
6 *   the terms of the GNU General Public License version 2.
7 *
8 * ----------------------------------------------------------------------- */
9
10#include <disk/common.h>
11#include <disk/geom.h>
12#include <disk/read.h>
13#include <stdlib.h>
14#include <string.h>
15#include <stdio.h>
16
17/**
18 * get_mbr_string - return a string describing the boot code
19 * @label:              first four bytes of the MBR
20 * @buffer:             pre-allocated buffer
21 * @buffer_size:        @buffer size
22 **/
23void get_mbr_string(const uint32_t label, char *buffer, const int buffer_size)
24{
25    /* 2 bytes are usually enough to identify the MBR */
26    uint16_t s_label = label >> 16;
27
28    switch (s_label) {
29    case 0x0000:
30    case 0xfabe:
31        strlcpy(buffer, "No bootloader", buffer_size - 1);
32        break;
33    case 0x0ebe:
34        strlcpy(buffer, "ThinkPad", buffer_size - 1);
35        break;
36    case 0x31c0:
37        strlcpy(buffer, "Acer 3", buffer_size - 1);
38        break;
39    case 0x33c0:
40        /* We need more than 2 bytes */
41        if (((label >> 8) & 0xff) == 0x8e)
42            strlcpy(buffer, "Windows", buffer_size - 1);
43        else if (((label >> 8) & 0xff) == 0x90)
44            strlcpy(buffer, "DiskCryptor", buffer_size - 1);
45        else if (((label >> 8) & 0xff) == 0xfa)
46            strlcpy(buffer, "Syslinux", buffer_size - 1);
47        else
48            strlcpy(buffer, "Unknown mbr", buffer_size - 1);
49        break;
50    case 0x33ed:
51        strlcpy(buffer, "Syslinux ISOhybrid", buffer_size - 1);
52        break;
53    case 0x33ff:
54        strlcpy(buffer, "HP/Gateway", buffer_size - 1);
55        break;
56    case 0xb800:
57        strlcpy(buffer, "PloP", buffer_size - 1);
58        break;
59    case 0xea05:
60        strlcpy(buffer, "XOSL", buffer_size - 1);
61        break;
62    case 0xea1e:
63        strlcpy(buffer, "Truecrypt Boot Loader", buffer_size - 1);
64        break;
65    case 0xeb04:
66        strlcpy(buffer, "Solaris", buffer_size - 1);
67        break;
68    case 0xeb31:
69        strlcpy(buffer, "Paragon", buffer_size - 1);
70        break;
71    case 0xeb48:
72        strlcpy(buffer, "Grub", buffer_size - 1);
73        break;
74    case 0xeb4c:
75        strlcpy(buffer, "Grub2 (v1.96)", buffer_size - 1);
76        break;
77    case 0xeb63:
78        strlcpy(buffer, "Grub2 (v1.97)", buffer_size - 1);
79        break;
80    case 0xeb5e:
81        /* We need more than 2 bytes */
82        if (((label >> 8) & 0xff) == 0x00)
83            strlcpy(buffer, "fbinst", buffer_size - 1);
84        else if (((label >> 8) & 0xff) == 0x80)
85            strlcpy(buffer, "Grub4Dos", buffer_size - 1);
86        else if (((label >> 8) & 0xff) == 0x90)
87            strlcpy(buffer, "WEE", buffer_size - 1);
88        else
89            strlcpy(buffer, "Unknown mbr", buffer_size - 1);
90        break;
91    case 0xfa31:
92        /* We need more than 2 bytes */
93        if (((label >> 8) & 0xff) == 0xc0)
94            strlcpy(buffer, "Syslinux", buffer_size - 1);
95        else if (((label >> 8) & 0xff) == 0xc9)
96            strlcpy(buffer, "Master Boot LoaDeR", buffer_size - 1);
97        else
98            strlcpy(buffer, "Unknown mbr", buffer_size - 1);
99        break;
100    case 0xfa33:
101        strlcpy(buffer, "MS-DOS 3.30 through Windows 95 (A)", buffer_size - 1);
102        break;
103    case 0xfab8:
104        strlcpy(buffer, "FreeDOS (eXtended FDisk)", buffer_size - 1);
105        break;
106    case 0xfaeb:
107        strlcpy(buffer, "Lilo", buffer_size - 1);
108        break;
109    case 0xfc31:
110        strlcpy(buffer, "Testdisk", buffer_size - 1);
111        break;
112    case 0xfc33:
113        strlcpy(buffer, "GAG", buffer_size - 1);
114        break;
115    case 0xfceb:
116        strlcpy(buffer, "BootIT NG", buffer_size - 1);
117        break;
118    default:
119        strlcpy(buffer, "Unknown mbr", buffer_size - 1);
120        break;
121    }
122
123    buffer[buffer_size - 1] = '\0';
124}
125
126/**
127 * get_mbr_id - return the first four bytes of the MBR
128 * @d:          driveinfo struct describing the drive
129 **/
130uint32_t get_mbr_id(const struct driveinfo *d)
131{
132    char mbr[SECTOR * sizeof(char)];
133
134    if (read_mbr(d->disk, &mbr) == -1)
135        return -1;
136    else {
137        uint32_t mbr_id;
138        /* Reverse the opcodes */
139        mbr_id = (*(uint8_t *) (mbr + 3));
140        mbr_id += (*(uint8_t *) (mbr + 2) << 8);
141        mbr_id += (*(uint8_t *) (mbr + 1) << 16);
142        mbr_id += (*(uint8_t *) mbr) << 24;
143        return mbr_id;
144    }
145}
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