1 /*
2 * Copyright (C) 2014 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 <inttypes.h>
18 #include <stdio.h>
19 #include <string.h>
20 #include <errno.h>
21 #include <limits.h>
22 #include <stdlib.h>
23
24 #include <private/android_filesystem_config.h>
25 #include <private/canned_fs_config.h>
26
27 typedef struct {
28 const char* path;
29 unsigned uid;
30 unsigned gid;
31 unsigned mode;
32 uint64_t capabilities;
33 } Path;
34
35 static Path* canned_data = NULL;
36 static int canned_alloc = 0;
37 static int canned_used = 0;
38
path_compare(const void * a,const void * b)39 static int path_compare(const void* a, const void* b) {
40 return strcmp(((Path*)a)->path, ((Path*)b)->path);
41 }
42
load_canned_fs_config(const char * fn)43 int load_canned_fs_config(const char* fn) {
44 FILE* f = fopen(fn, "r");
45 if (f == NULL) {
46 fprintf(stderr, "failed to open %s: %s\n", fn, strerror(errno));
47 return -1;
48 }
49
50 char line[PATH_MAX + 200];
51 while (fgets(line, sizeof(line), f)) {
52 while (canned_used >= canned_alloc) {
53 canned_alloc = (canned_alloc+1) * 2;
54 canned_data = (Path*) realloc(canned_data, canned_alloc * sizeof(Path));
55 }
56 Path* p = canned_data + canned_used;
57 p->path = strdup(strtok(line, " "));
58 p->uid = atoi(strtok(NULL, " "));
59 p->gid = atoi(strtok(NULL, " "));
60 p->mode = strtol(strtok(NULL, " "), NULL, 8); // mode is in octal
61 p->capabilities = 0;
62
63 char* token = NULL;
64 do {
65 token = strtok(NULL, " ");
66 if (token && strncmp(token, "capabilities=", 13) == 0) {
67 p->capabilities = strtoll(token+13, NULL, 0);
68 break;
69 }
70 } while (token);
71
72 canned_used++;
73 }
74
75 fclose(f);
76
77 qsort(canned_data, canned_used, sizeof(Path), path_compare);
78 printf("loaded %d fs_config entries\n", canned_used);
79
80 return 0;
81 }
82
83 static const int kDebugCannedFsConfig = 0;
84
canned_fs_config(const char * path,int dir,const char * target_out_path,unsigned * uid,unsigned * gid,unsigned * mode,uint64_t * capabilities)85 void canned_fs_config(const char* path, int dir, const char* target_out_path,
86 unsigned* uid, unsigned* gid, unsigned* mode, uint64_t* capabilities) {
87 Path key;
88 key.path = path;
89 if (path[0] == '/')
90 key.path++; // canned paths lack the leading '/'
91 Path* p = (Path*) bsearch(&key, canned_data, canned_used, sizeof(Path), path_compare);
92 if (p == NULL) {
93 fprintf(stderr, "failed to find [%s] in canned fs_config\n", path);
94 exit(1);
95 }
96 *uid = p->uid;
97 *gid = p->gid;
98 *mode = p->mode;
99 *capabilities = p->capabilities;
100
101 if (kDebugCannedFsConfig) {
102 // for debugging, run the built-in fs_config and compare the results.
103
104 unsigned c_uid, c_gid, c_mode;
105 uint64_t c_capabilities;
106 fs_config(path, dir, target_out_path, &c_uid, &c_gid, &c_mode, &c_capabilities);
107
108 if (c_uid != *uid) printf("%s uid %d %d\n", path, *uid, c_uid);
109 if (c_gid != *gid) printf("%s gid %d %d\n", path, *gid, c_gid);
110 if (c_mode != *mode) printf("%s mode 0%o 0%o\n", path, *mode, c_mode);
111 if (c_capabilities != *capabilities)
112 printf("%s capabilities %" PRIx64 " %" PRIx64 "\n",
113 path,
114 *capabilities,
115 c_capabilities);
116 }
117 }
118