1 files changed, 149 insertions, 0 deletions
diff --git a/cmds/installd/utils.c b/cmds/installd/utils.c
new file mode 100644
index 0000000..5db5545
--- /dev/null
+++ b/cmds/installd/utils.c
@@ -0,0 +1,149 @@
+/*
+** Copyright 2008, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+#include "installd.h"
+
+int create_pkg_path(char path[PKG_PATH_MAX],
+                    const char *prefix,
+                    const char *pkgname,
+                    const char *postfix)
+{
+    int len;
+    const char *x;
+
+    len = strlen(pkgname);
+    if (len > PKG_NAME_MAX) {
+        return -1;
+    }
+    if ((len + strlen(prefix) + strlen(postfix)) >= PKG_PATH_MAX) {
+        return -1;
+    }
+
+    x = pkgname;
+    while (*x) {
+        if (isalnum(*x) || (*x == '_')) {
+                /* alphanumeric or underscore are fine */
+        } else if (*x == '.') {
+            if ((x == pkgname) || (x[1] == '.') || (x[1] == 0)) {
+                    /* periods must not be first, last, or doubled */
+                LOGE("invalid package name '%s'\n", pkgname);
+                return -1;
+            }
+        } else {
+                /* anything not A-Z, a-z, 0-9, _, or . is invalid */
+            LOGE("invalid package name '%s'\n", pkgname);
+            return -1;
+        }
+        x++;
+    }
+
+    sprintf(path, "%s%s%s", prefix, pkgname, postfix);
+    return 0;
+}
+
+static int _delete_dir_contents(DIR *d, const char *ignore)
+{
+    int result = 0;
+    struct dirent *de;
+    int dfd;
+
+    dfd = dirfd(d);
+
+    if (dfd < 0) return -1;
+
+    while ((de = readdir(d))) {
+        const char *name = de->d_name;
+
+            /* skip the ignore name if provided */
+        if (ignore && !strcmp(name, ignore)) continue;
+
+        if (de->d_type == DT_DIR) {
+            int r, subfd;
+            DIR *subdir;
+
+                /* always skip "." and ".." */
+            if (name[0] == '.') {
+                if (name[1] == 0) continue;
+                if ((name[1] == '.') && (name[2] == 0)) continue;
+            }
+
+            subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
+            if (subfd < 0) {
+                result = -1;
+                continue;
+            }
+            subdir = fdopendir(subfd);
+            if (subdir == NULL) {
+                close(subfd);
+                result = -1;
+                continue;
+            }
+            if (_delete_dir_contents(subdir, 0)) {
+                result = -1;
+            }
+            closedir(subdir);
+            if (unlinkat(dfd, name, AT_REMOVEDIR) < 0) {
+                result = -1;
+            }
+        } else {
+            if (unlinkat(dfd, name, 0) < 0) {
+                result = -1;
+            }
+        }
+    }
+
+    return result;
+}
+
+int delete_dir_contents(const char *pathname,
+                        int also_delete_dir,
+                        const char *ignore)
+{
+    int res = 0;
+    DIR *d;
+
+    d = opendir(pathname);
+    if (d == NULL) {
+        return -errno;
+    }
+    res = _delete_dir_contents(d, ignore);
+    closedir(d);
+    if (also_delete_dir) {
+        if (rmdir(pathname)) {
+            res = -1;
+        }
+    }
+    return res;
+}
+
+int delete_dir_contents_fd(int dfd, const char *name)
+{
+    int fd, res;
+    DIR *d;
+
+    fd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
+    if (fd < 0) {
+        return -1;
+    }
+    d = fdopendir(fd);
+    if (d == NULL) {
+        close(fd);
+        return -1;
+    }
+    res = _delete_dir_contents(d, 0);
+    closedir(d);
+    return res;
+}