1 #include <stdio.h>
2 #include <string.h>
3 #include "finstext2.h"
4 #include "ext2.h" // #defines ext2_data
5 #include <linux/hdreg.h>
6 #include <linux/ext3_fs.h>
7 #include <sys/ioctl.h>
8 #include <sys/types.h>
9 #include <sys/stat.h>
10 #include <fcntl.h>
11 #include <unistd.h>
12
13 #define MAJOR_VERSION 1
14 #define MINOR_VERSION 0
15
16 PEXT2_BOOTCODE Ext2BootCode = (PEXT2_BOOTCODE)ext2_data;
17 struct ext3_super_block Ext2SuperBlock;
18 struct hd_geometry Ext2DriveGeometry;
19 unsigned char Ext2ExistingBootCode[1024];
20
21 char BlockDevice[260];
22 int BlockDeviceSpecified = 0;
23 int BlockDeviceFileDescriptor;
24
main(int argc,char * argv[])25 int main(int argc, char *argv[])
26 {
27 int Index;
28 char ch;
29
30 // Verify that we got enough command line parameters
31 if (argc < 2)
32 {
33 printf("finstext2 block_device [-v]\n\n");
34 printf("block_device Specifies the ext2/3 volume to install to (i.e. /dev/hda1)\n");
35 printf("-v Displays the version\n\n");
36 }
37
38 // Parse the command line parameters
39 for (Index=1; Index<argc; Index++)
40 {
41 if (strcmp(argv[Index], "-v") == 0)
42 {
43 printf("FreeLoader Ext2/3 Installer v%d.%d\n", MAJOR_VERSION, MINOR_VERSION);
44 }
45 else
46 {
47 strcpy(BlockDevice, argv[Index]);
48 BlockDeviceSpecified = 1;
49 }
50 }
51
52 if (BlockDeviceSpecified)
53 {
54 BlockDeviceFileDescriptor = open(BlockDevice, O_RDWR|O_SYNC);
55
56 if (BlockDeviceFileDescriptor == -1)
57 {
58 printf("Couldn't open block device %s\n", BlockDevice);
59 return 1;
60 }
61
62 if (read(BlockDeviceFileDescriptor, Ext2ExistingBootCode, (size_t)1024) != (ssize_t)1024)
63 {
64 close(BlockDeviceFileDescriptor);
65 printf("Couldn't read existing boot code from %s\n", BlockDevice);
66 return 1;
67 }
68
69 for (Index=0; Index<1024; Index++)
70 {
71 if (Ext2ExistingBootCode[Index] != 0x00)
72 {
73 printf("This EXT2/3 volume has existing boot code.\n");
74 printf("Do you want to overwrite it? [y/n] ");
75 scanf("%c", &ch);
76
77 if (ch == 'n' || ch == 'N')
78 {
79 close(BlockDeviceFileDescriptor);
80 printf("Cancelled.\n");
81 return 0;
82 }
83
84 break;
85 }
86 }
87
88 if (read(BlockDeviceFileDescriptor, &Ext2SuperBlock, (size_t)1024) != (ssize_t)1024)
89 {
90 close(BlockDeviceFileDescriptor);
91 printf("Couldn't read super block from %s\n", BlockDevice);
92 return 1;
93 }
94
95 if (Ext2SuperBlock.s_magic != EXT3_SUPER_MAGIC)
96 {
97 close(BlockDeviceFileDescriptor);
98 printf("Block device %s is not a EXT2/3 volume or has an invalid super block.\n", BlockDevice);
99 return 1;
100 }
101
102 if (ioctl(BlockDeviceFileDescriptor, HDIO_GETGEO, &Ext2DriveGeometry) != 0)
103 {
104 close(BlockDeviceFileDescriptor);
105 printf("Couldn't get drive geometry from block device %s\n", BlockDevice);
106 return 1;
107 }
108
109 printf("Heads: %d\n", Ext2DriveGeometry.heads);
110 printf("Sectors: %d\n", Ext2DriveGeometry.sectors);
111 printf("Cylinders: %d\n", Ext2DriveGeometry.cylinders);
112 printf("Start: %d\n", Ext2DriveGeometry.start);
113
114 Ext2BootCode->BootDrive = 0xff;
115 Ext2BootCode->BootPartition = 0x00;
116 //Ext2BootCode->SectorsPerTrack = Ext2DriveGeometry.sectors;
117 //Ext2BootCode->NumberOfHeads = Ext2DriveGeometry.heads;
118 Ext2BootCode->Ext2VolumeStartSector = Ext2DriveGeometry.start;
119 Ext2BootCode->Ext2BlockSizeInBytes = 1024 << Ext2SuperBlock.s_log_block_size;
120 Ext2BootCode->Ext2BlockSize = Ext2BootCode->Ext2BlockSizeInBytes / 512;
121 Ext2BootCode->Ext2PointersPerBlock = Ext2BootCode->Ext2BlockSizeInBytes / 4;
122 Ext2BootCode->Ext2GroupDescPerBlock = Ext2BootCode->Ext2BlockSizeInBytes / 32;
123 Ext2BootCode->Ext2FirstDataBlock = Ext2SuperBlock.s_first_data_block;
124 Ext2BootCode->Ext2InodesPerGroup = Ext2SuperBlock.s_inodes_per_group;
125 Ext2BootCode->Ext2InodesPerBlock = Ext2BootCode->Ext2BlockSizeInBytes / 128;
126
127 if (lseek(BlockDeviceFileDescriptor, (off_t)0, SEEK_SET) == (off_t)-1)
128 {
129 close(BlockDeviceFileDescriptor);
130 printf("Couldn't write boot code on %s\n", BlockDevice);
131 return 1;
132 }
133
134 if (write(BlockDeviceFileDescriptor, Ext2BootCode, (size_t)1024) != (ssize_t)1024)
135 {
136 close(BlockDeviceFileDescriptor);
137 printf("Couldn't write boot code on %s\n", BlockDevice);
138 return 1;
139 }
140
141 close(BlockDeviceFileDescriptor);
142
143 printf("Boot code written successfully!\n");
144 }
145
146 return 0;
147 }
148