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 int alpha = -1;
37 while (*x) {
38 if (isalnum(*x) || (*x == '_')) {
39 /* alphanumeric or underscore are fine */
40 } else if (*x == '.') {
41 if ((x == pkgname) || (x[1] == '.') || (x[1] == 0)) {
42 /* periods must not be first, last, or doubled */
43 LOGE("invalid package name '%s'\n", pkgname);
44 return -1;
45 }
46 } else if (*x == '-') {
47 /* Suffix -X is fine to let versioning of packages.
48 But whatever follows should be alphanumeric.*/
49 alpha = 1;
50 }else {
51 /* anything not A-Z, a-z, 0-9, _, or . is invalid */
52 LOGE("invalid package name '%s'\n", pkgname);
53 return -1;
54 }
55 x++;
56 }
57 if (alpha == 1) {
58 // Skip current character
59 x++;
60 while (*x) {
61 if (!isalnum(*x)) {
62 LOGE("invalid package name '%s' should include only numbers after -\n", pkgname);
63 return -1;
64 }
65 x++;
66 }
67 }
68
69 sprintf(path, "%s%s%s", prefix, pkgname, postfix);
70 return 0;
71 }
72
_delete_dir_contents(DIR * d,const char * ignore)73 static int _delete_dir_contents(DIR *d, const char *ignore)
74 {
75 int result = 0;
76 struct dirent *de;
77 int dfd;
78
79 dfd = dirfd(d);
80
81 if (dfd < 0) return -1;
82
83 while ((de = readdir(d))) {
84 const char *name = de->d_name;
85
86 /* skip the ignore name if provided */
87 if (ignore && !strcmp(name, ignore)) continue;
88
89 if (de->d_type == DT_DIR) {
90 int r, subfd;
91 DIR *subdir;
92
93 /* always skip "." and ".." */
94 if (name[0] == '.') {
95 if (name[1] == 0) continue;
96 if ((name[1] == '.') && (name[2] == 0)) continue;
97 }
98
99 subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
100 if (subfd < 0) {
101 LOGE("Couldn't openat %s: %s\n", name, strerror(errno));
102 result = -1;
103 continue;
104 }
105 subdir = fdopendir(subfd);
106 if (subdir == NULL) {
107 LOGE("Couldn't fdopendir %s: %s\n", name, strerror(errno));
108 close(subfd);
109 result = -1;
110 continue;
111 }
112 if (_delete_dir_contents(subdir, 0)) {
113 result = -1;
114 }
115 closedir(subdir);
116 if (unlinkat(dfd, name, AT_REMOVEDIR) < 0) {
117 LOGE("Couldn't unlinkat %s: %s\n", name, strerror(errno));
118 result = -1;
119 }
120 } else {
121 if (unlinkat(dfd, name, 0) < 0) {
122 LOGE("Couldn't unlinkat %s: %s\n", name, strerror(errno));
123 result = -1;
124 }
125 }
126 }
127
128 return result;
129 }
130
delete_dir_contents(const char * pathname,int also_delete_dir,const char * ignore)131 int delete_dir_contents(const char *pathname,
132 int also_delete_dir,
133 const char *ignore)
134 {
135 int res = 0;
136 DIR *d;
137
138 d = opendir(pathname);
139 if (d == NULL) {
140 LOGE("Couldn't opendir %s: %s\n", pathname, strerror(errno));
141 return -errno;
142 }
143 res = _delete_dir_contents(d, ignore);
144 closedir(d);
145 if (also_delete_dir) {
146 if (rmdir(pathname)) {
147 LOGE("Couldn't rmdir %s: %s\n", pathname, strerror(errno));
148 res = -1;
149 }
150 }
151 return res;
152 }
153
delete_dir_contents_fd(int dfd,const char * name)154 int delete_dir_contents_fd(int dfd, const char *name)
155 {
156 int fd, res;
157 DIR *d;
158
159 fd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
160 if (fd < 0) {
161 LOGE("Couldn't openat %s: %s\n", name, strerror(errno));
162 return -1;
163 }
164 d = fdopendir(fd);
165 if (d == NULL) {
166 LOGE("Couldn't fdopendir %s: %s\n", name, strerror(errno));
167 close(fd);
168 return -1;
169 }
170 res = _delete_dir_contents(d, 0);
171 closedir(d);
172 return res;
173 }
174