int create_pkg_path_in_dir(char path[PKG_PATH_MAX],
const dir_rec_t* dir,
const char* pkgname,
const char* postfix)
{
const size_t postfix_len = strlen(postfix);
const size_t pkgname_len = strlen(pkgname);
if (pkgname_len > PKG_NAME_MAX) {
return -1;
}
if (is_valid_package_name(pkgname) < 0) {
return -1;
}
if ((pkgname_len + dir->len + postfix_len) >= PKG_PATH_MAX) {
return -1;
}
char *dst = path;
size_t dst_size = PKG_PATH_MAX;
if (append_and_increment(&dst, dir->path, &dst_size) < 0
|| append_and_increment(&dst, pkgname, &dst_size) < 0
|| append_and_increment(&dst, postfix, &dst_size) < 0) {
ALOGE("Error building APK path");
return -1;
}
return 0;
}
/**
* Create the path name for user data for a certain persona.
* Returns 0 on success, and -1 on failure.
*/
int create_persona_path(char path[PKG_PATH_MAX],
uid_t persona)
{
size_t uid_len;
char* persona_prefix;
if (persona == 0) {
persona_prefix = PRIMARY_USER_PREFIX;
uid_len = 0;
} else {
persona_prefix = SECONDARY_USER_PREFIX;
uid_len = snprintf(NULL, 0, "%d/", persona);
}
char *dst = path;
size_t dst_size = PKG_PATH_MAX;
if (append_and_increment(&dst, android_data_dir.path, &dst_size) < 0
|| append_and_increment(&dst, persona_prefix, &dst_size) < 0) {
ALOGE("Error building prefix for user path");
return -1;
}
if (persona != 0) {
if (dst_size < uid_len + 1) {
ALOGE("Error building user path");
return -1;
}
int ret = snprintf(dst, dst_size, "%d/", persona);
if (ret < 0 || (size_t) ret != uid_len) {
ALOGE("Error appending persona id to path");
return -1;
}
}
return 0;
}
TEST_F(UtilsTest, AppendAndIncrement_TooBig) {
size_t dst_size = 5;
char dst[dst_size];
char *dstp = dst;
const char* src = "FOO";
EXPECT_EQ(0, append_and_increment(&dstp, src, &dst_size))
<< "String should append successfully";
EXPECT_STREQ("FOO", dst)
<< "String should append correctly";
EXPECT_EQ(-1, append_and_increment(&dstp, src, &dst_size))
<< "String should fail because it's too large to fit";
}
/**
* Puts the string into the record as a directory. Appends '/' to the end
* of all paths. Caller owns the string that is inserted into the directory
* record. A null value will result in an error.
*
* Returns 0 on success and -1 on error.
*/
int get_path_from_string(dir_rec_t* rec, const char* path) {
if (path == NULL) {
return -1;
} else {
const size_t path_len = strlen(path);
if (path_len <= 0) {
return -1;
}
// Make sure path is absolute.
if (path[0] != '/') {
return -1;
}
if (path[path_len - 1] == '/') {
// Path ends with a forward slash. Make our own copy.
rec->path = strdup(path);
if (rec->path == NULL) {
return -1;
}
rec->len = path_len;
} else {
// Path does not end with a slash. Generate a new string.
char *dst;
// Add space for slash and terminating null.
size_t dst_size = path_len + 2;
rec->path = malloc(dst_size);
if (rec->path == NULL) {
return -1;
}
dst = rec->path;
if (append_and_increment(&dst, path, &dst_size) < 0
|| append_and_increment(&dst, "/", &dst_size)) {
LOGE("Error canonicalizing path");
return -1;
}
rec->len = dst - rec->path;
}
}
return 0;
}
TEST_F(UtilsTest, AppendAndIncrement_Normal) {
size_t dst_size = 10;
char dst[dst_size];
char *dstp = dst;
const char* src = "FOO";
EXPECT_EQ(0, append_and_increment(&dstp, src, &dst_size))
<< "String should append successfully";
EXPECT_STREQ("FOO", dst)
<< "String should append correctly";
EXPECT_EQ(0, append_and_increment(&dstp, src, &dst_size))
<< "String should append successfully again";
EXPECT_STREQ("FOOFOO", dst)
<< "String should append correctly again";
}
/**
* Create the package path name for a given package name with a postfix for
* a certain userid. Returns 0 on success, and -1 on failure.
*/
int create_pkg_path(char path[PKG_PATH_MAX],
const char *pkgname,
const char *postfix,
userid_t userid)
{
size_t userid_len;
char* userid_prefix;
if (userid == 0) {
userid_prefix = PRIMARY_USER_PREFIX;
userid_len = 0;
} else {
userid_prefix = SECONDARY_USER_PREFIX;
userid_len = snprintf(NULL, 0, "%d", userid);
}
const size_t prefix_len = android_data_dir.len + strlen(userid_prefix)
+ userid_len + 1 /*slash*/;
char prefix[prefix_len + 1];
char *dst = prefix;
size_t dst_size = sizeof(prefix);
if (append_and_increment(&dst, android_data_dir.path, &dst_size) < 0
|| append_and_increment(&dst, userid_prefix, &dst_size) < 0) {
ALOGE("Error building prefix for APK path");
return -1;
}
if (userid != 0) {
int ret = snprintf(dst, dst_size, "%d/", userid);
if (ret < 0 || (size_t) ret != userid_len + 1) {
ALOGW("Error appending UID to APK path");
return -1;
}
}
dir_rec_t dir;
dir.path = prefix;
dir.len = prefix_len;
return create_pkg_path_in_dir(path, &dir, pkgname, postfix);
}
