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/*
* Copyright (C) 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.
*/
/*
* Some utility functions for use with command-line utilities.
*/
#include "DexFile.h"
#include "ZipArchive.h"
#include "CmdUtils.h"
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <fcntl.h>
#include <errno.h>
#ifndef O_BINARY
#define O_BINARY 0
#endif
/*
* Extract "classes.dex" from archive file.
*
* If "quiet" is set, don't report common errors.
*/
UnzipToFileResult dexUnzipToFile(const char* zipFileName,
const char* outFileName, bool quiet)
{
UnzipToFileResult result = kUTFRSuccess;
static const char* kFileToExtract = "classes.dex";
ZipArchiveHandle archive;
ZipEntry entry;
bool unlinkOnFailure = false;
int fd = -1;
if (dexZipOpenArchive(zipFileName, &archive) != 0) {
if (!quiet) {
fprintf(stderr, "Unable to open '%s' as zip archive\n",
zipFileName);
}
result = kUTFRNotZip;
goto bail;
}
fd = open(outFileName, O_WRONLY | O_CREAT | O_EXCL, 0600);
if (fd < 0) {
fprintf(stderr, "Unable to create output file '%s': %s\n",
outFileName, strerror(errno));
result = kUTFROutputFileProblem;
goto bail;
}
unlinkOnFailure = true;
if (dexZipFindEntry(archive, kFileToExtract, &entry) != 0) {
if (!quiet) {
fprintf(stderr, "Unable to find '%s' in '%s'\n",
kFileToExtract, zipFileName);
}
result = kUTFRNoClassesDex;
goto bail;
}
if (dexZipExtractEntryToFile(archive, &entry, fd) != 0) {
fprintf(stderr, "Extract of '%s' from '%s' failed\n",
kFileToExtract, zipFileName);
result = kUTFRBadZip;
goto bail;
}
bail:
if (fd >= 0)
close(fd);
if (unlinkOnFailure && result != kUTFRSuccess)
unlink(outFileName);
dexZipCloseArchive(&archive);
return result;
}
/*
* Map the specified DEX file read-only (possibly after expanding it into a
* temp file from a Jar). Pass in a MemMapping struct to hold the info.
* If the file is an unoptimized DEX file, then byte-swapping and structural
* verification are performed on it before the memory is made read-only.
*
* The temp file is deleted after the map succeeds.
*
* This is intended for use by tools (e.g. dexdump) that need to get a
* read-only copy of a DEX file that could be in a number of different states.
*
* If "tempFileName" is NULL, a default value is used. The temp file is
* deleted after the map succeeds.
*
* If "quiet" is set, don't report common errors.
*
* Returns 0 (kUTFRSuccess) on success.
*/
UnzipToFileResult dexOpenAndMap(const char* fileName, const char* tempFileName,
MemMapping* pMap, bool quiet)
{
UnzipToFileResult result = kUTFRGenericFailure;
int len = strlen(fileName);
char tempNameBuf[32];
bool removeTemp = false;
int fd = -1;
if (len < 5) {
if (!quiet) {
fprintf(stderr,
"ERROR: filename must end in .dex, .zip, .jar, or .apk\n");
}
result = kUTFRBadArgs;
goto bail;
}
if (strcasecmp(fileName + len -3, "dex") != 0) {
if (tempFileName == NULL) {
/*
* Try .zip/.jar/.apk, all of which are Zip archives with
* "classes.dex" inside. We need to extract the compressed
* data to a temp file, the location of which varies.
*
* On the device we must use /sdcard because most other
* directories aren't writable (either because of permissions
* or because the volume is mounted read-only). On desktop
* it's nice to use the designated temp directory.
*/
if (access("/tmp", W_OK) == 0) {
sprintf(tempNameBuf, "/tmp/dex-temp-%d", getpid());
} else if (access("/sdcard", W_OK) == 0) {
sprintf(tempNameBuf, "/sdcard/dex-temp-%d", getpid());
} else {
fprintf(stderr,
"NOTE: /tmp and /sdcard unavailable for temp files\n");
sprintf(tempNameBuf, "dex-temp-%d", getpid());
}
tempFileName = tempNameBuf;
}
result = dexUnzipToFile(fileName, tempFileName, quiet);
if (result == kUTFRSuccess) {
//printf("+++ Good unzip to '%s'\n", tempFileName);
fileName = tempFileName;
removeTemp = true;
} else if (result == kUTFRNotZip) {
if (!quiet) {
fprintf(stderr, "Not Zip, retrying as DEX\n");
}
} else {
if (!quiet && result == kUTFRNoClassesDex) {
fprintf(stderr, "Zip has no classes.dex\n");
}
goto bail;
}
}
result = kUTFRGenericFailure;
/*
* Pop open the (presumed) DEX file.
*/
fd = open(fileName, O_RDONLY | O_BINARY);
if (fd < 0) {
if (!quiet) {
fprintf(stderr, "ERROR: unable to open '%s': %s\n",
fileName, strerror(errno));
}
goto bail;
}
if (sysMapFileInShmemWritableReadOnly(fd, pMap) != 0) {
fprintf(stderr, "ERROR: Unable to map '%s'\n", fileName);
goto bail;
}
/*
* This call will fail if the file exists on a filesystem that
* doesn't support mprotect(). If that's the case, then the file
* will have already been mapped private-writable by the previous
* call, so we don't need to do anything special if this call
* returns non-zero.
*/
sysChangeMapAccess(pMap->addr, pMap->length, true, pMap);
if (dexSwapAndVerifyIfNecessary((u1*) pMap->addr, pMap->length)) {
fprintf(stderr, "ERROR: Failed structural verification of '%s'\n",
fileName);
goto bail;
}
/*
* Similar to above, this call will fail if the file wasn't ever
* read-only to begin with. This is innocuous, though it is
* undesirable from a memory hygiene perspective.
*/
sysChangeMapAccess(pMap->addr, pMap->length, false, pMap);
/*
* Success! Close the file and return with the start/length in pMap.
*/
result = kUTFRSuccess;
bail:
if (fd >= 0)
close(fd);
if (removeTemp) {
/* this will fail if the OS doesn't allow removal of a mapped file */
if (unlink(tempFileName) != 0) {
fprintf(stderr, "WARNING: unable to remove temp '%s'\n",
tempFileName);
}
}
return result;
}
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