OpenWrt – Blame information for rev 1

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Rev Author Line No. Line
1 office 1 /* J J Larworthy 27 September 2006 */
2  
3 /* file to read the boot sector of a dis and the loaded image and report
4 * if the boot rom would accept the data as intact and suitable for use
5 */
6  
7 #include <sys/types.h>
8 #include <sys/stat.h>
9 #include <sys/errno.h>
10  
11 #include <fcntl.h>
12 #include <unistd.h>
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <string.h>
16 #include <assert.h>
17  
18 extern uint32_t crc32(uint32_t, const unsigned char *, unsigned int);
19  
20 #define NUMBER_VECTORS 12
21 struct {
22 unsigned int start_vector[NUMBER_VECTORS];
23 char code[4];
24 unsigned int header_length;
25 unsigned int reserved[3];
26 unsigned int length;
27 unsigned int img_CRC;
28 unsigned int CRC;
29 } img_header;
30  
31 void print_usage(void)
32 {
33 printf("update_header file.bin\n");
34 }
35  
36 void print_header(void)
37 {
38 int i;
39  
40 printf("vectors in header\n");
41 for (i = 0; i < NUMBER_VECTORS; i++) {
42 printf("%d:0x%08x\n", i, img_header.start_vector[i]);
43 }
44 printf("length:%8x\nimg_CRC:0x%08x\nHeader CRC:0x%08x\n",
45 img_header.length, img_header.img_CRC, img_header.CRC);
46 }
47  
48 int main(int argc, char **argv)
49 {
50 int in_file;
51 int status;
52 int unsigned crc;
53 int file_length;
54 int len;
55  
56 struct stat file_stat;
57  
58 void *executable;
59  
60 in_file = open(argv[1], O_RDWR);
61  
62 if (in_file < 0) {
63 printf("failed to open file:%s\n", argv[optind]);
64 return -ENOENT;
65 }
66  
67 status = fstat(in_file, &file_stat);
68  
69 /* read header and obtain size of image */
70 status = read(in_file, &img_header, sizeof(img_header));
71  
72 file_length = file_stat.st_size - sizeof(img_header);
73  
74 if (img_header.length != file_length) {
75 printf("size in header:%d, size of file: %d\n",
76 img_header.length, file_length);
77 }
78 img_header.length = file_length;
79  
80 /* read working image and CRC */
81 executable = malloc(file_length);
82  
83 status = read(in_file, executable, file_length);
84  
85 if (status != file_length) {
86 printf("Failed to load image\n");
87 return -ENOENT;
88 }
89  
90 /* verify image CRC */
91 crc = crc32(0, (const unsigned char *) executable, img_header.length);
92  
93 if (crc != img_header.img_CRC) {
94 printf("New Image CRC:0x%08x, hdr:0x%08x\n", crc,
95 img_header.img_CRC);
96 img_header.img_CRC = crc;
97 }
98 memcpy(img_header.code, "BOOT", 4);
99 img_header.header_length = sizeof(img_header);
100  
101 /* check header CRC */
102 crc = crc32(0, (const unsigned char *) &img_header,
103 sizeof(img_header) - sizeof(unsigned int));
104 if (crc != img_header.CRC) {
105 printf("New header CRC - crc:0x%08x hdr:0x%08x\n", crc,
106 img_header.CRC);
107 img_header.CRC = crc;
108 }
109  
110 /* re-write the file */
111 status = lseek(in_file, 0, SEEK_SET);
112 if (status != 0) {
113 printf("failed to rewind\n");
114 return 1;
115 }
116 len = write(in_file, &img_header, sizeof(img_header));
117 assert(len == sizeof(img_header));
118 len = write(in_file, executable, file_length);
119 assert(len == file_length);
120 close(in_file);
121  
122 return 0;
123 }