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
|
#include "command.h"
#include "lslib.h"
#include <dirent.h>
#include <grp.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <pwd.h>
static struct {
bool recurse;
bool list_changed;
bool verbose;
bool quiet;
uid_t uid;
gid_t gid;
} flags;
static void help (void) {
printf("Usage: chown [-Rcvf]... USER[:[GRP]] FILE...\n\n");
printf("Change the owner and/or group of FILEs to USER and/or GRP\n\n");
printf("\t-R\tRecurse\n");
printf("\t-c\tList changed files\n");
printf("\t-v\tVerbose\n");
printf("\t-f\tHide errors\n");
}
static int short_arg(char c, char* next) {
UNUSED(next);
switch (c) {
case 'R':
flags.recurse = true;
break;
case 'c':
flags.list_changed = true;
break;
case 'v':
flags.verbose = true;
break;
case 'f':
flags.quiet = true;
break;
default:
return ARG_INVALID;
}
return ARG_UNUSED;
}
static void chown_file(char* path) {
int save;
struct stat s;
DIR* d;
struct dirent* file;
save = push_path_buffer(path);
if (chown(get_path_buffer(), flags.uid, flags.gid) < 0) {
if (!flags.quiet) {
error_s("cannot chown '%s'", get_path_buffer());
}
pop_path_buffer(save);
return;
} else if (flags.list_changed) {
printf("chown: changed '%s' to %u:%u\n", get_path_buffer(), flags.uid, flags.gid);
}
if (!flags.recurse) {
pop_path_buffer(save);
return;
}
if (lstat(get_path_buffer(), &s) < 0) {
if (!flags.quiet) {
error_s("cannot stat '%s'", get_path_buffer());
}
pop_path_buffer(save);
return;
}
if (!S_ISDIR(s.st_mode)) {
pop_path_buffer(save);
return;
}
d = opendir(get_path_buffer());
if (d == NULL) {
if (!flags.quiet) {
error_s("cannot open dir '%s'", get_path_buffer());
}
pop_path_buffer(save);
return;
}
while ((file = readdir(d)) != NULL) {
if (is_dot_dir(file->d_name)) continue;
chown_file(file->d_name);
}
closedir(d);
pop_path_buffer(save);
}
static void parse_ownership(char* str) {
char* user = str;
char* group = NULL;
char* end = NULL;
unsigned long i;
struct passwd* p = NULL;
struct group* g = NULL;
for (i = 0; i < strlen(str); i++) {
if (str[i] == ':') {
str[i] = '\0';
group = &str[i] + 1;
break;
}
}
flags.uid = strtol(user, &end, 10);
if (end != user) goto group;
if ((p = getpwnam(user)) == NULL) {
error("invalid user '%s'", user);
} else {
flags.uid = p->pw_uid;
}
group:
if (group == NULL) {
if (p == NULL) {
flags.gid = flags.uid;
} else {
flags.gid = p->pw_gid;
}
return;
}
flags.gid = strtol(group, &end, 10);
if (end != group) return;
if ((g = getgrnam(group)) == NULL) {
error("invalid group '%s'", group);
} else {
flags.gid = g->gr_gid;
}
}
COMMAND(chown_main) {
int start, i;
flags.recurse = false;
flags.list_changed = false;
flags.verbose = false;
flags.quiet = false;
start = parse_args(argc, argv, help, short_arg, NULL);
if (argc - start < 1) {
if (!flags.quiet) {
error("no onwership passed");
} else {
return EXIT_FAILURE;
}
}
parse_ownership(argv[start]);
if (argc - start < 1) {
if (!flags.quiet) {
error("no files passed");
} else {
return EXIT_FAILURE;
}
}
for (i = start + 1; i < argc; i++) {
chown_file(argv[i]);
}
return EXIT_SUCCESS;
}
|
