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
|
/*
* (C) Copyright IBM Corp. 2003
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* seq_dd
*
* Simple testing program to write a numerical sequence to a device, or
* to verify that a device contains a desired numerical sequence. Inspired
* by "hashdd" from Joe Thornber.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#define SECTOR_SIZE 512
#define ENTRIES_PER_SECTOR (SECTOR_SIZE / sizeof(u_int64_t))
static void usage(void)
{
printf("Usage:\n");
printf("\tseq_dd\n");
printf("\t\tof=<output_file> | if=<input_file>\n");
printf("\t\tstart=<starting_sector> [default = 0]\n");
printf("\t\tcount=<num_sectors> [default = 8]\n");
printf("\t\tindex=<starting_index> [default = 0]\n");
}
static int read_file(char *filename, unsigned long start,
unsigned long count, unsigned long index)
{
u_int64_t *buffer;
unsigned long i;
int fd, rc, j, failed = 0;
buffer = malloc(SECTOR_SIZE);
if (!buffer) {
fprintf(stderr, "Memory allocation error\n");
return 1;
}
fd = open(filename, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "Error opening \"%s\": %s\n",
filename, strerror(errno));
free(buffer);
return 1;
}
rc = lseek(fd, start * SECTOR_SIZE, SEEK_SET);
if (rc < 0) {
fprintf(stderr, "Error seeking to starting sector %lu\n", start);
free(buffer);
return 1;
}
for (i = 0; i < count && !failed; i++, index++) {
rc = read(fd, buffer, SECTOR_SIZE);
if (rc != SECTOR_SIZE) {
fprintf(stderr, "Unable to read sector %lu\n", start + i);
break;
}
for (j = 0; j < ENTRIES_PER_SECTOR; j++) {
if (buffer[j] != index) {
failed = 1;
break;
}
}
}
rc = (i == count) ? (failed) ? 1 : 0 : 1;
printf("Read %lu sectors from %s starting at sector %lu\n",
i, filename, start);
printf("%s %svalid\n", filename, rc ? "in" : "" );
return rc;
}
static int write_file(char *filename, unsigned long start,
unsigned long count, unsigned long index)
{
u_int64_t *buffer;
unsigned long i;
int fd, rc, j;
buffer = malloc(SECTOR_SIZE);
if (!buffer) {
fprintf(stderr, "Memory allocation error\n");
return 1;
}
fd = open(filename, O_CREAT | O_WRONLY);
if (fd < 0) {
fprintf(stderr, "Error opening \"%s\": %s\n",
filename, strerror(errno));
free(buffer);
return 1;
}
rc = lseek(fd, start * SECTOR_SIZE, SEEK_SET);
if (rc < 0) {
fprintf(stderr, "Error seeking to starting sector %lu\n", start);
free(buffer);
return 1;
}
for (i = 0; i < count; i++, index++) {
for (j = 0; j < ENTRIES_PER_SECTOR; j++) {
buffer[j] = index;
}
rc = write(fd, buffer, SECTOR_SIZE);
if (rc != SECTOR_SIZE) {
fprintf(stderr, "Unable to write index %lu to sector %lu\n",
index, start + i);
break;
}
}
printf("Wrote %lu sectors to %s starting at sector %lu\n",
i, filename, start);
free(buffer);
return (i == count) ? 0 : 1;
}
int main(int argc, char **argv)
{
struct stat st;
char *filename = NULL;
char act[10];
char action = 0;
int i, j, rc;
unsigned long start = 0, count = 8, index = 0;
if (argc < 2) {
usage();
return 1;
}
for (i = 1; i < argc; i++) {
j = strcspn(argv[i], "=");
j++;
if (j < 3 || j > 6) {
usage();
return 1;
}
memset(act, 0, sizeof(char)*10);
strncpy(act, argv[i], j);
if (!strcmp(act, "if=")) {
filename = &(argv[i][j]);
action = 'r';
} else if (!strcmp(act, "of=")) {
filename = &(argv[i][j]);
action = 'w';
} else if (!strcmp(act, "start=")) {
start = strtoul(&(argv[i][j]), NULL, 10);
} else if (!strcmp(act, "count=")) {
count = strtoul(&(argv[i][j]), NULL, 10);
} else if (!strcmp(act, "index=")) {
index = strtoul(&(argv[i][j]), NULL, 10);
} else {
usage();
return 1;
}
}
if (!filename) {
usage();
return 1;
}
rc = stat(filename, &st);
if (rc) {
if (!(action == 'w' && errno == ENOENT)) {
printf("Unable to stat %s: %s\n", filename, strerror(errno));
return 1;
}
} else {
if (!S_ISREG(st.st_mode) && !S_ISBLK(st.st_mode)) {
printf("%s is not a regular file or a block-device.\n", filename);
return 1;
}
}
if (action == 'w') {
rc = write_file(filename, start, count, index);
} else if (action == 'r') {
rc = read_file(filename, start, count, index);
} else {
usage();
return 1;
}
return rc;
}
|
