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Commit 3d5b8f5

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my_chattr: working with multiple flags
1 parent 04d8b06 commit 3d5b8f5

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2 files changed

+197
-24
lines changed

2 files changed

+197
-24
lines changed

‎15_File_Attributes/my_chattr.c‎

Lines changed: 193 additions & 22 deletions
Original file line numberDiff line numberDiff line change
@@ -48,10 +48,26 @@
4848
* Set the file's project number. *
4949
* -------------------------------------------------------------------------- */
5050

51+
#include <ctype.h>
52+
#include <fcntl.h>
53+
#include <linux/fs.h>
5154
#include <stdio.h>
5255
#include <stdlib.h>
56+
#include <sys/ioctl.h>
57+
#include <sys/stat.h>
5358
#include <unistd.h>
5459

60+
void usage(char *pgm_name, char *msg)
61+
{
62+
fprintf(stderr,
63+
"Usage: %s %s\n",
64+
pgm_name,
65+
"[ -RVf ] [ -v version ] [ -p project ] [ mode ] files..."
66+
);
67+
if (msg != NULL)
68+
fprintf(stderr, "%s\n", msg);
69+
}
70+
5571
int main(int argc, char *argv[])
5672
{
5773
int opt;
@@ -61,18 +77,18 @@ int main(int argc, char *argv[])
6177
int file_version = 0;
6278
int project_num = 0;
6379
char *mode = NULL;
80+
char *file_name = NULL;
81+
char *pgm_name = argv[0];
6482

65-
while (((opt = getopt(argc, argv, ":RVfv:p:")) != -1)&& !args_done)
83+
while (!args_done&&((opt = getopt(argc, argv, ":RVfv:p:")) != -1))
6684
{
85+
if (verbosity > 1) {
86+
fprintf(stderr, "optind=%d, opt='%c',optarg='%s'\n", optind, opt, optarg);
87+
}
6788
switch (opt)
6889
{
6990
case 'R':
70-
fprintf(stderr,
71-
"Usage: %s %s\n",
72-
argv[0],
73-
"[ -RVf ] [ -v version ] [ -p project ] [ mode ] files..."
74-
);
75-
fprintf(stderr, "-R is not implemented\n");
91+
usage(pgm_name, "-R is not implemented");
7692
exit(EXIT_FAILURE);
7793
break;
7894
case 'V':
@@ -82,34 +98,86 @@ int main(int argc, char *argv[])
8298
suppress_errors = 1;
8399
break;
84100
case 'v':
85-
file_version = atoi(optarg);
101+
if (verbosity > 1) {
102+
fprintf(
103+
stderr,
104+
"set file version\nargv[%d]='%s'\n",
105+
optind,
106+
argv[optind]);
107+
}
108+
if (optarg != NULL && isdigit(*optarg)) {
109+
file_version = atoi(optarg);
110+
} else {
111+
usage(pgm_name, "-v requires a numeric argument");
112+
exit(EXIT_FAILURE);
113+
}
86114
break;
87115
case 'p':
88-
project_num = atoi(optarg);
116+
if (verbosity > 1) {
117+
fprintf(
118+
stderr,
119+
"set project number\nargv[%d]='%s'\n",
120+
optind,
121+
argv[optind]);
122+
}
123+
if (optarg != NULL && isdigit(*optarg)) {
124+
project_num = atoi(optarg);
125+
} else {
126+
usage(pgm_name, "-p requires a numeric argument");
127+
exit(EXIT_FAILURE);
128+
}
129+
break;
130+
case ':':
131+
fprintf(stderr, "Missing argument\n");
132+
if (verbosity > 1) {
133+
fprintf(
134+
stderr,
135+
"argv[%d]='%s'\n",
136+
optind,
137+
argv[optind]);
138+
}
139+
exit(EXIT_FAILURE);
89140
break;
90141
default: /* '?' */
142+
if (verbosity > 1) {
143+
fprintf(
144+
stderr,
145+
"end of arguments\nargv[%d]='%s'\n",
146+
optind,
147+
argv[optind]);
148+
}
91149
args_done = 1;
92150
break;
93151
}
94152
}
95153

96-
if (optind >= argc)
154+
optind -= (args_done) ? 1 : 0;
155+
if (optind < argc)
97156
{
157+
mode = argv[optind];
158+
switch (*mode)
159+
{
160+
case '+':
161+
case '-':
162+
case '=':
163+
if (optind + 1 >= argc)
164+
{
165+
fprintf(stderr, "Expecting file names\n");
166+
exit(EXIT_FAILURE);
167+
} else {
168+
file_name = argv[optind+1];
169+
}
170+
break;
171+
default:
172+
mode = NULL;
173+
file_name = argv[optind];
174+
break;
175+
}
176+
} else {
98177
fprintf(stderr, "Expecting file names\n");
99178
exit(EXIT_FAILURE);
100179
}
101-
102-
switch (*argv[optind])
103-
{
104-
case '+':
105-
case '-':
106-
case '=':
107-
mode = argv[optind];
108-
break;
109-
default:
110-
mode = NULL;
111-
break;
112-
}
180+
113181

114182
if (verbosity)
115183
{
@@ -137,8 +205,111 @@ int main(int argc, char *argv[])
137205
fprintf(stderr, "not changed\n");
138206
}
139207
fprintf(stderr, "Mode: %s\n", (mode) ? mode : "Not used");
208+
fprintf(stderr, "File name: %s\n", file_name);
209+
}
210+
211+
if (! mode) {
212+
fprintf(
213+
stderr,
214+
"%s: No mode specified\n",
215+
pgm_name
216+
);
217+
exit(EXIT_FAILURE);
140218
}
141219

220+
int fd = open(file_name, O_RDONLY);
221+
if (fd == -1) {
222+
fprintf(stderr, "%s: open of '%s' failed: %m\n", pgm_name, file_name);
223+
exit(EXIT_FAILURE);
224+
}
225+
226+
enum fs_ops { set_flags, rm_flags, add_flags };
227+
enum fs_ops op;
228+
switch (*mode) {
229+
case '-':
230+
op = rm_flags;
231+
break;
232+
case '+':
233+
op = add_flags;
234+
break;
235+
case '=':
236+
op = set_flags;
237+
break;
238+
default:
239+
usage(pgm_name, "Invalid mode operation");
240+
exit(EXIT_FAILURE);
241+
}
242+
243+
unsigned int fs_mask = 0;
244+
for ( char *flag_ch = mode + 1; *flag_ch; flag_ch++ ) {
245+
switch (*flag_ch) {
246+
case 'a': fs_mask |= FS_APPEND_FL; break;
247+
case 'c': fs_mask |= FS_COMPR_FL; break;
248+
case 'D': fs_mask |= FS_DIRSYNC_FL; break;
249+
case 'i': fs_mask |= FS_IMMUTABLE_FL; break;
250+
case 'j': fs_mask |= FS_JOURNAL_DATA_FL; break;
251+
case 'A': fs_mask |= FS_NOATIME_FL; break;
252+
case 'd': fs_mask |= FS_NODUMP_FL; break;
253+
case 't': fs_mask |= FS_NOTAIL_FL; break;
254+
case 's': fs_mask |= FS_SECRM_FL; break;
255+
case 'S': fs_mask |= FS_SYNC_FL; break;
256+
case 'T': fs_mask |= FS_TOPDIR_FL; break;
257+
case 'u': fs_mask |= FS_UNRM_FL; break;
258+
default:
259+
if ( ! suppress_errors ) {
260+
fprintf(
261+
stderr,
262+
"%s: invalid mode '%c' found - ignored\n",
263+
pgm_name,
264+
*flag_ch
265+
);
266+
}
267+
break;
268+
}
269+
}
270+
271+
unsigned int attr = 0;
272+
273+
if (op != set_flags && ioctl(fd, FS_IOC_GETFLAGS, &attr) == -1) {
274+
fprintf(
275+
stderr,
276+
"%s: Get flags from '%s' failed: %m\n",
277+
pgm_name,
278+
file_name);
279+
exit(EXIT_FAILURE);
280+
}
281+
282+
if (verbosity > 1) {
283+
fprintf(
284+
stderr,
285+
"op=%d,attr(before)=%0X,",
286+
op,
287+
attr);
288+
}
289+
if (op == set_flags) {
290+
attr = fs_mask;
291+
} else {
292+
attr |= fs_mask;
293+
if (op == rm_flags) {
294+
attr ^= fs_mask;
295+
}
296+
}
297+
if (verbosity > 1) {
298+
fprintf(
299+
stderr,
300+
"attr(after)=%0X,fs_mask=%0X\n",
301+
attr,
302+
fs_mask);
303+
}
304+
305+
if (ioctl(fd, FS_IOC_SETFLAGS, &attr) == -1) {
306+
fprintf(
307+
stderr,
308+
"%s: Set flags from '%s' failed: %m\n",
309+
pgm_name,
310+
file_name);
311+
exit(EXIT_FAILURE);
312+
}
142313

143314
exit(EXIT_SUCCESS);
144315
}

‎15_File_Attributes/run_test_chattr.sh‎

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -90,14 +90,16 @@ do
9090
case "${fs_file}" in
9191
*base*)
9292
chattr "${mode}" "${fs_file}"
93-
result_file=$(echo "${fs_file}" | sed -re 's!.*/([^/]+)_base/target!1円!')"${mode}"
93+
result_file=$(echo "${fs_file}" | \
94+
sed -re 's!.*/([^/]+)_base/target!1円!')"${mode}"
9495
printf '%s: %s %s\n' "${mode}" $(lsattr "${fs_file}") | \
9596
sed -re 's!.*: (.*) .*/target!1円!' \
9697
>"base_results/${result_file}"
9798
;;
9899
*mine*)
99100
./my_chattr "${mode}" "${fs_file}"
100-
result_file=$(echo "${fs_file}" | sed -re 's!.*/([^/]+)_mine/target!1円!')"${mode}"
101+
result_file=$(echo "${fs_file}" | \
102+
sed -re 's!.*/([^/]+)_mine/target!1円!')"${mode}"
101103
printf '%s: %s %s\n' "${mode}" $(lsattr "${fs_file}") | \
102104
sed -re 's!.*: (.*) .*/target!1円!' \
103105
>"mine_results/${result_file}"

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