1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
// SPDX-License-Identifier: GPL-2.0-only
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <libgen.h>
#include <stdarg.h>
#include <getopt.h>
#include <string.h>
#include <errno.h>
#include <netinet/in.h> // htonl
// Usage: mkdapimg [-p] [-m <model>] -s <sig> -i <input> -o <output>
//
// e.g.: mkdapimg -s RT3052-AP-DAP1350-3 -i sysupgrade.bin -o factory.bin
//
// If the model string <model> is not given, we will assume that
// the leading characters upto the first "-" is the model.
//
// The "-p" (patch) option is used to patch the exisiting image with the
// specified model and signature.
// The "-x" (fix) option will recalculate the payload size and checksum
// during the patch mode operation.
// The img_hdr_struct was taken from the D-Link SDK:
// DAP-1350_A1_FW1.11NA_GPL/GPL_Source_Code/Uboot/DAP-1350/httpd/header.h
#define MAX_MODEL_NAME_LEN 20
#define MAX_SIG_LEN 30
#define MAX_REGION_LEN 4
#define MAX_VERSION_LEN 12
struct img_hdr_struct {
uint32_t checksum;
char model[MAX_MODEL_NAME_LEN];
char sig[MAX_SIG_LEN];
uint8_t partition;
uint8_t hdr_len;
uint8_t rsv1;
uint8_t rsv2;
uint32_t flash_byte_cnt;
} imghdr ;
char *progname;
void
perrexit(int code, char *msg)
{
fprintf(stderr, "%s: %s: %s\n", progname, msg, strerror(errno));
exit(code);
}
void
usage()
{
fprintf(stderr, "usage: %s [-p] [-m model] [-r region] [-v version] -s signature -i input -o output\n", progname);
exit(1);
}
int
main(int ac, char *av[])
{
char model[MAX_MODEL_NAME_LEN+1];
char signature[MAX_SIG_LEN+1];
char region[MAX_REGION_LEN+1];
char version[MAX_VERSION_LEN+1];
int patchmode = 0;
int fixmode = 0;
int have_regionversion = 0;
FILE *ifile = NULL;
FILE *ofile = NULL;
int c;
uint32_t cksum;
uint32_t bcnt;
progname = basename(av[0]);
memset(model, 0, sizeof(model));
memset(signature, 0, sizeof(signature));
memset(region, 0, sizeof(region));
memset(version, 0, sizeof(version));
while ( 1 ) {
int c;
c = getopt(ac, av, "pxm:r:v:s:i:o:");
if (c == -1)
break;
switch (c) {
case 'p':
patchmode = 1;
break;
case 'x':
fixmode = 1;
break;
case 'm':
if (strlen(optarg) > MAX_MODEL_NAME_LEN) {
fprintf(stderr, "%s: model name exceeds %d chars\n",
progname, MAX_MODEL_NAME_LEN);
exit(1);
}
strcpy(model, optarg);
break;
case 'r':
if (strlen(optarg) > MAX_REGION_LEN) {
fprintf(stderr, "%s: region exceeds %d chars\n",
progname, MAX_REGION_LEN);
exit(1);
}
have_regionversion = 1;
strcpy(region, optarg);
break;
case 'v':
if (strlen(optarg) > MAX_VERSION_LEN) {
fprintf(stderr, "%s: version exceeds %d chars\n",
progname, MAX_VERSION_LEN);
exit(1);
}
have_regionversion = 1;
strcpy(version, optarg);
break;
case 's':
if (strlen(optarg) > MAX_SIG_LEN) {
fprintf(stderr, "%s: signature exceeds %d chars\n",
progname, MAX_SIG_LEN);
exit(1);
}
strcpy(signature, optarg);
break;
case 'i':
if ((ifile = fopen(optarg, "r")) == NULL)
perrexit(1, optarg);
break;
case 'o':
if ((ofile = fopen(optarg, "w")) == NULL)
perrexit(1, optarg);
break;
default:
usage();
}
}
if (signature[0] == 0 || ifile == NULL || ofile == NULL) {
usage();
}
if (model[0] == 0) {
char *p = strchr(signature, '-');
if (p == NULL) {
fprintf(stderr, "%s: model name unknown\n", progname);
exit(1);
}
if (p - signature > MAX_MODEL_NAME_LEN) {
*p = 0;
fprintf(stderr, "%s: auto model name failed, string %s too long\n", progname, signature);
exit(1);
}
strncpy(model, signature, p - signature);
}
if (patchmode) {
if (fread(&imghdr, sizeof(imghdr), 1, ifile) < 0)
perrexit(2, "fread on input");
}
for (bcnt = 0, cksum = 0 ; (c = fgetc(ifile)) != EOF ; bcnt++)
cksum += c & 0xff;
if (fseek(ifile, patchmode ? sizeof(imghdr) : 0, SEEK_SET) < 0)
perrexit(2, "fseek on input");
if (patchmode == 0) {
// Fill in the header
memset(&imghdr, 0, sizeof(imghdr));
imghdr.checksum = htonl(cksum);
imghdr.partition = 0 ; // don't care?
imghdr.hdr_len = sizeof(imghdr);
if (have_regionversion) {
imghdr.hdr_len += MAX_REGION_LEN;
imghdr.hdr_len += MAX_VERSION_LEN;
}
imghdr.flash_byte_cnt = htonl(bcnt);
} else {
if (ntohl(imghdr.checksum) != cksum) {
fprintf(stderr, "%s: patch mode, checksum mismatch\n",
progname);
if (fixmode) {
fprintf(stderr, "%s: fixing\n", progname);
imghdr.checksum = htonl(cksum);
} else
exit(3);
} else if (ntohl(imghdr.flash_byte_cnt) != bcnt) {
fprintf(stderr, "%s: patch mode, size mismatch\n",
progname);
if (fixmode) {
fprintf(stderr, "%s: fixing\n", progname);
imghdr.flash_byte_cnt = htonl(bcnt);
} else
exit(3);
}
}
strncpy(imghdr.model, model, MAX_MODEL_NAME_LEN);
strncpy(imghdr.sig, signature, MAX_SIG_LEN);
if (fwrite(&imghdr, sizeof(imghdr), 1, ofile) < 0)
perrexit(2, "fwrite header on output");
if (have_regionversion) {
if (fwrite(®ion, MAX_REGION_LEN, 1, ofile) < 0)
perrexit(2, "fwrite header on output");
if (fwrite(&version, MAX_VERSION_LEN, 1, ofile) < 0)
perrexit(2, "fwrite header on output");
}
while ((c = fgetc(ifile)) != EOF) {
if (fputc(c, ofile) == EOF)
perrexit(2, "fputc on output");
}
if (ferror(ifile))
perrexit(2, "fgetc on input");
fclose(ofile);
fclose(ifile);
}
|
