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#include <dirent.h>
#include <inttypes.h>
#include <sys/stat.h>
#include "idmap.h"
#include <UniquePtr.h>
#include <androidfw/ResourceTypes.h>
#include <androidfw/StreamingZipInflater.h>
#include <androidfw/ZipFileRO.h>
#include <private/android_filesystem_config.h> // for AID_SYSTEM
#include <utils/SortedVector.h>
#include <utils/String16.h>
#include <utils/String8.h>
#define NO_OVERLAY_TAG (-1000)
using namespace android;
namespace {
struct Overlay {
Overlay() {}
Overlay(const String8& a, const String8& i, int p) :
apk_path(a), idmap_path(i), priority(p) {}
bool operator<(Overlay const& rhs) const
{
// Note: order is reversed by design
return rhs.priority < priority;
}
String8 apk_path;
String8 idmap_path;
int priority;
};
bool writePackagesList(const char *filename, const SortedVector<Overlay>& overlayVector)
{
FILE* fout = fopen(filename, "w");
if (fout == NULL) {
return false;
}
for (size_t i = 0; i < overlayVector.size(); ++i) {
const Overlay& overlay = overlayVector[i];
fprintf(fout, "%s %s\n", overlay.apk_path.string(), overlay.idmap_path.string());
}
fclose(fout);
// Make file world readable since Zygote (running as root) will read
// it when creating the initial AssetManger object
const mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // 0644
if (chmod(filename, mode) == -1) {
unlink(filename);
return false;
}
return true;
}
String8 flatten_path(const char *path)
{
String16 tmp(path);
tmp.replaceAll('/', '@');
return String8(tmp);
}
int parse_overlay_tag(const ResXMLTree& parser, const char *target_package_name)
{
const size_t N = parser.getAttributeCount();
String16 target;
int priority = -1;
for (size_t i = 0; i < N; ++i) {
size_t len;
String16 key(parser.getAttributeName(i, &len));
if (key == String16("targetPackage")) {
const char16_t *p = parser.getAttributeStringValue(i, &len);
if (p != NULL) {
target = String16(p, len);
}
} else if (key == String16("priority")) {
Res_value v;
if (parser.getAttributeValue(i, &v) == sizeof(Res_value)) {
priority = v.data;
if (priority < 0 || priority > 9999) {
return -1;
}
}
}
}
if (target == String16(target_package_name)) {
return priority;
}
return NO_OVERLAY_TAG;
}
int parse_manifest(const void *data, size_t size, const char *target_package_name)
{
ResXMLTree parser;
parser.setTo(data, size);
if (parser.getError() != NO_ERROR) {
ALOGD("%s failed to init xml parser, error=0x%08x\n", __FUNCTION__, parser.getError());
return -1;
}
ResXMLParser::event_code_t type;
do {
type = parser.next();
if (type == ResXMLParser::START_TAG) {
size_t len;
String16 tag(parser.getElementName(&len));
if (tag == String16("overlay")) {
return parse_overlay_tag(parser, target_package_name);
}
}
} while (type != ResXMLParser::BAD_DOCUMENT && type != ResXMLParser::END_DOCUMENT);
return NO_OVERLAY_TAG;
}
int parse_apk(const char *path, const char *target_package_name)
{
UniquePtr<ZipFileRO> zip(ZipFileRO::open(path));
if (zip.get() == NULL) {
ALOGW("%s: failed to open zip %s\n", __FUNCTION__, path);
return -1;
}
ZipEntryRO entry;
if ((entry = zip->findEntryByName("AndroidManifest.xml")) == NULL) {
ALOGW("%s: failed to find entry AndroidManifest.xml\n", __FUNCTION__);
return -1;
}
uint32_t uncompLen = 0;
uint16_t method;
if (!zip->getEntryInfo(entry, &method, &uncompLen, NULL, NULL, NULL, NULL)) {
ALOGW("%s: failed to read entry info\n", __FUNCTION__);
return -1;
}
if (method != ZipFileRO::kCompressDeflated) {
ALOGW("%s: cannot handle zip compression method %" PRIu16 "\n", __FUNCTION__, method);
return -1;
}
FileMap *dataMap = zip->createEntryFileMap(entry);
if (dataMap == NULL) {
ALOGW("%s: failed to create FileMap\n", __FUNCTION__);
return -1;
}
char *buf = new char[uncompLen];
if (NULL == buf) {
ALOGW("%s: failed to allocate %" PRIu32 " byte\n", __FUNCTION__, uncompLen);
delete dataMap;
return -1;
}
StreamingZipInflater inflater(dataMap, uncompLen);
if (inflater.read(buf, uncompLen) < 0) {
ALOGW("%s: failed to inflate %" PRIu32 " byte\n", __FUNCTION__, uncompLen);
delete[] buf;
delete dataMap;
return -1;
}
int priority = parse_manifest(buf, static_cast<size_t>(uncompLen), target_package_name);
delete[] buf;
delete dataMap;
return priority;
}
}
int idmap_scan(const char *overlay_dir, const char *target_package_name,
const char *target_apk_path, const char *idmap_dir)
{
String8 filename = String8(idmap_dir);
filename.appendPath("overlays.list");
if (unlink(filename.string()) != 0 && errno != ENOENT) {
return EXIT_FAILURE;
}
DIR *dir = opendir(overlay_dir);
if (dir == NULL) {
return EXIT_FAILURE;
}
SortedVector<Overlay> overlayVector;
struct dirent *dirent;
while ((dirent = readdir(dir)) != NULL) {
struct stat st;
char overlay_apk_path[PATH_MAX + 1];
snprintf(overlay_apk_path, PATH_MAX, "%s/%s", overlay_dir, dirent->d_name);
if (stat(overlay_apk_path, &st) < 0) {
continue;
}
if (!S_ISREG(st.st_mode)) {
continue;
}
int priority = parse_apk(overlay_apk_path, target_package_name);
if (priority < 0) {
continue;
}
String8 idmap_path(idmap_dir);
idmap_path.appendPath(flatten_path(overlay_apk_path + 1));
idmap_path.append("@idmap");
if (idmap_create_path(target_apk_path, overlay_apk_path, idmap_path.string()) != 0) {
ALOGE("error: failed to create idmap for target=%s overlay=%s idmap=%s\n",
target_apk_path, overlay_apk_path, idmap_path.string());
continue;
}
Overlay overlay(String8(overlay_apk_path), idmap_path, priority);
overlayVector.add(overlay);
}
closedir(dir);
if (!writePackagesList(filename.string(), overlayVector)) {
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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