1 /*
2 ** Copyright 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 "installd.h"
18
create_pkg_path(char path[PKG_PATH_MAX],const char * prefix,const char * pkgname,const char * postfix)19 int create_pkg_path(char path[PKG_PATH_MAX],
20 const char *prefix,
21 const char *pkgname,
22 const char *postfix)
23 {
24 int len;
25 const char *x;
26
27 len = strlen(pkgname);
28 if (len > PKG_NAME_MAX) {
29 return -1;
30 }
31 if ((len + strlen(prefix) + strlen(postfix)) >= PKG_PATH_MAX) {
32 return -1;
33 }
34
35 x = pkgname;
36 while (*x) {
37 if (isalnum(*x) || (*x == '_')) {
38 /* alphanumeric or underscore are fine */
39 } else if (*x == '.') {
40 if ((x == pkgname) || (x[1] == '.') || (x[1] == 0)) {
41 /* periods must not be first, last, or doubled */
42 LOGE("invalid package name '%s'\n", pkgname);
43 return -1;
44 }
45 } else {
46 /* anything not A-Z, a-z, 0-9, _, or . is invalid */
47 LOGE("invalid package name '%s'\n", pkgname);
48 return -1;
49 }
50 x++;
51 }
52
53 sprintf(path, "%s%s%s", prefix, pkgname, postfix);
54 return 0;
55 }
56
_delete_dir_contents(DIR * d,const char * ignore)57 static int _delete_dir_contents(DIR *d, const char *ignore)
58 {
59 int result = 0;
60 struct dirent *de;
61 int dfd;
62
63 dfd = dirfd(d);
64
65 if (dfd < 0) return -1;
66
67 while ((de = readdir(d))) {
68 const char *name = de->d_name;
69
70 /* skip the ignore name if provided */
71 if (ignore && !strcmp(name, ignore)) continue;
72
73 if (de->d_type == DT_DIR) {
74 int r, subfd;
75 DIR *subdir;
76
77 /* always skip "." and ".." */
78 if (name[0] == '.') {
79 if (name[1] == 0) continue;
80 if ((name[1] == '.') && (name[2] == 0)) continue;
81 }
82
83 subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
84 if (subfd < 0) {
85 result = -1;
86 continue;
87 }
88 subdir = fdopendir(subfd);
89 if (subdir == NULL) {
90 close(subfd);
91 result = -1;
92 continue;
93 }
94 if (_delete_dir_contents(subdir, 0)) {
95 result = -1;
96 }
97 closedir(subdir);
98 if (unlinkat(dfd, name, AT_REMOVEDIR) < 0) {
99 result = -1;
100 }
101 } else {
102 if (unlinkat(dfd, name, 0) < 0) {
103 result = -1;
104 }
105 }
106 }
107
108 return result;
109 }
110
delete_dir_contents(const char * pathname,int also_delete_dir,const char * ignore)111 int delete_dir_contents(const char *pathname,
112 int also_delete_dir,
113 const char *ignore)
114 {
115 int res = 0;
116 DIR *d;
117
118 d = opendir(pathname);
119 if (d == NULL) {
120 return -errno;
121 }
122 res = _delete_dir_contents(d, ignore);
123 closedir(d);
124 if (also_delete_dir) {
125 if (rmdir(pathname)) {
126 res = -1;
127 }
128 }
129 return res;
130 }
131
delete_dir_contents_fd(int dfd,const char * name)132 int delete_dir_contents_fd(int dfd, const char *name)
133 {
134 int fd, res;
135 DIR *d;
136
137 fd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
138 if (fd < 0) {
139 return -1;
140 }
141 d = fdopendir(fd);
142 if (d == NULL) {
143 close(fd);
144 return -1;
145 }
146 res = _delete_dir_contents(d, 0);
147 closedir(d);
148 return res;
149 }
150