1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <stdio.h>
18 #include <stdlib.h>
19 #include <sys/stat.h>
20 #include <errno.h>
21 #include <unistd.h>
22 #include <string.h>
23 #include <inttypes.h>
24
25 #include "private/android_filesystem_config.h"
26 #include "private/fs_config.h"
27
28 // This program takes a list of files and directories (indicated by a
29 // trailing slash) on the stdin, and prints to stdout each input
30 // filename along with its desired uid, gid, and mode (in octal).
31 // The leading slash should be stripped from the input.
32 //
33 // After the first 4 columns, optional key=value pairs are emitted
34 // for each file. Currently, the following keys are supported:
35 //
36 // -C: capabilities=[hex capabilities value]
37 //
38 // Example input:
39 //
40 // system/etc/dbus.conf
41 // data/app/
42 //
43 // Output:
44 //
45 // system/etc/dbus.conf 1002 1002 440
46 // data/app 1000 1000 771
47 //
48 // Note that the output will omit the trailing slash from
49 // directories.
50
usage()51 static void usage() {
52 fprintf(stderr, "Usage: fs_config [-D product_out_path] [-R root] [-C]\n");
53 }
54
main(int argc,char ** argv)55 int main(int argc, char** argv) {
56 char buffer[1024];
57 const char* product_out_path = NULL;
58 char* root_path = NULL;
59 int print_capabilities = 0;
60 int opt;
61 while((opt = getopt(argc, argv, "CR:D:")) != -1) {
62 switch(opt) {
63 case 'C':
64 print_capabilities = 1;
65 break;
66 case 'R':
67 root_path = optarg;
68 break;
69 case 'D':
70 product_out_path = optarg;
71 break;
72 default:
73 usage();
74 exit(EXIT_FAILURE);
75 }
76 }
77
78 if (root_path != NULL) {
79 size_t root_len = strlen(root_path);
80 /* Trim any trailing slashes from the root path. */
81 while (root_len && root_path[--root_len] == '/') {
82 root_path[root_len] = '\0';
83 }
84 }
85
86 while (fgets(buffer, 1023, stdin) != NULL) {
87 int is_dir = 0;
88 int i;
89 for (i = 0; i < 1024 && buffer[i]; ++i) {
90 switch (buffer[i]) {
91 case '\n':
92 buffer[i-is_dir] = '\0';
93 if (i == 0) {
94 is_dir = 1; // empty line is considered as root directory
95 }
96 i = 1025;
97 break;
98 case '/':
99 is_dir = 1;
100 break;
101 default:
102 is_dir = 0;
103 break;
104 }
105 }
106
107 unsigned uid = 0, gid = 0, mode = 0;
108 uint64_t capabilities;
109 fs_config(buffer, is_dir, product_out_path, &uid, &gid, &mode, &capabilities);
110 if (root_path != NULL && strcmp(buffer, root_path) == 0) {
111 /* The root of the filesystem needs to be an empty string. */
112 strcpy(buffer, "");
113 }
114 printf("%s %d %d %o", buffer, uid, gid, mode);
115
116 if (print_capabilities) {
117 printf(" capabilities=0x%" PRIx64, capabilities);
118 }
119
120 printf("\n");
121 }
122 return 0;
123 }
124