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/*
Copyright 2012 bigbiff/Dees_Troy TeamWin
This file is part of TWRP/TeamWin Recovery Project.
TWRP is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
TWRP is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with TWRP. If not, see <http://www.gnu.org/licenses/>.
*/
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include "twcommon.h"
#include "mincrypt/rsa.h"
#include "mincrypt/sha.h"
#include "minui/minui.h"
#ifdef HAVE_SELINUX
#include "minzip/SysUtil.h"
#include "minzip/Zip.h"
#else
#include "minzipold/SysUtil.h"
#include "minzipold/Zip.h"
#endif
#include "mtdutils/mounts.h"
#include "mtdutils/mtdutils.h"
#include "verifier.h"
#include "variables.h"
#include "data.hpp"
#include "partitions.hpp"
#include "twrpDigest.hpp"
#include "twrp-functions.hpp"
extern "C" {
#include "gui/gui.h"
#include "legacy_property_service.h"
}
static const char* properties_path = "/dev/__properties__";
static const char* properties_path_renamed = "/dev/__properties_kk__";
static void switch_to_legacy_properties()
{
char tmp[32];
int propfd, propsz;
legacy_properties_init();
legacy_get_property_workspace(&propfd, &propsz);
sprintf(tmp, "%d,%d", dup(propfd), propsz);
setenv("ANDROID_PROPERTY_WORKSPACE", tmp, 1);
if (TWFunc::Path_Exists(properties_path)) {
// hide real properties so that the updater uses the envvar to find the legacy format properties
if (rename(properties_path, properties_path_renamed) != 0)
LOGERR("Renaming properties failed: %s (assertions in old installers may fail)\n", strerror(errno));
}
}
static void switch_to_new_properties()
{
if (TWFunc::Path_Exists(properties_path_renamed)) {
if (rename(properties_path_renamed, properties_path) != 0)
LOGERR("Restoring properties failed: %s\n", strerror(errno));
}
}
static int Run_Update_Binary(const char *path, ZipArchive *Zip, int* wipe_cache) {
const ZipEntry* binary_location = mzFindZipEntry(Zip, ASSUMED_UPDATE_BINARY_NAME);
string Temp_Binary = "/tmp/updater";
int binary_fd, ret_val, pipe_fd[2], status, zip_verify;
char buffer[1024];
const char** args = (const char**)malloc(sizeof(char*) * 5);
FILE* child_data;
if (binary_location == NULL) {
mzCloseZipArchive(Zip);
return INSTALL_CORRUPT;
}
// Delete any existing updater
if (TWFunc::Path_Exists(Temp_Binary) && unlink(Temp_Binary.c_str()) != 0) {
LOGINFO("Unable to unlink '%s'\n", Temp_Binary.c_str());
}
binary_fd = creat(Temp_Binary.c_str(), 0755);
if (binary_fd < 0) {
mzCloseZipArchive(Zip);
LOGERR("Could not create file for updater extract in '%s'\n", Temp_Binary.c_str());
return INSTALL_ERROR;
}
ret_val = mzExtractZipEntryToFile(Zip, binary_location, binary_fd);
close(binary_fd);
if (!ret_val) {
mzCloseZipArchive(Zip);
LOGERR("Could not extract '%s'\n", ASSUMED_UPDATE_BINARY_NAME);
return INSTALL_ERROR;
}
// If exists, extract file_contexts from the zip file
const ZipEntry* selinx_contexts = mzFindZipEntry(Zip, "file_contexts");
if (selinx_contexts == NULL) {
mzCloseZipArchive(Zip);
LOGINFO("Zip does not contain SELinux file_contexts file in its root.\n");
} else {
string output_filename = "/file_contexts";
LOGINFO("Zip contains SELinux file_contexts file in its root. Extracting to %s\n", output_filename.c_str());
// Delete any file_contexts
if (TWFunc::Path_Exists(output_filename) && unlink(output_filename.c_str()) != 0) {
LOGINFO("Unable to unlink '%s'\n", output_filename.c_str());
}
int file_contexts_fd = creat(output_filename.c_str(), 0644);
if (file_contexts_fd < 0) {
mzCloseZipArchive(Zip);
LOGERR("Could not extract file_contexts to '%s'\n", output_filename.c_str());
return INSTALL_ERROR;
}
ret_val = mzExtractZipEntryToFile(Zip, selinx_contexts, file_contexts_fd);
close(file_contexts_fd);
if (!ret_val) {
mzCloseZipArchive(Zip);
LOGERR("Could not extract '%s'\n", ASSUMED_UPDATE_BINARY_NAME);
return INSTALL_ERROR;
}
}
mzCloseZipArchive(Zip);
pipe(pipe_fd);
args[0] = Temp_Binary.c_str();
args[1] = EXPAND(RECOVERY_API_VERSION);
char* temp = (char*)malloc(10);
sprintf(temp, "%d", pipe_fd[1]);
args[2] = temp;
args[3] = (char*)path;
args[4] = NULL;
pid_t pid = fork();
if (pid == 0) {
switch_to_legacy_properties();
close(pipe_fd[0]);
execve(Temp_Binary.c_str(), (char* const*)args, environ);
printf("E:Can't execute '%s'\n", Temp_Binary.c_str());
_exit(-1);
}
close(pipe_fd[1]);
*wipe_cache = 0;
DataManager::GetValue(TW_SIGNED_ZIP_VERIFY_VAR, zip_verify);
child_data = fdopen(pipe_fd[0], "r");
while (fgets(buffer, sizeof(buffer), child_data) != NULL) {
char* command = strtok(buffer, " \n");
if (command == NULL) {
continue;
} else if (strcmp(command, "progress") == 0) {
char* fraction_char = strtok(NULL, " \n");
char* seconds_char = strtok(NULL, " \n");
float fraction_float = strtof(fraction_char, NULL);
int seconds_float = strtol(seconds_char, NULL, 10);
if (zip_verify)
DataManager::ShowProgress(fraction_float * (1 - VERIFICATION_PROGRESS_FRACTION), seconds_float);
else
DataManager::ShowProgress(fraction_float, seconds_float);
} else if (strcmp(command, "set_progress") == 0) {
char* fraction_char = strtok(NULL, " \n");
float fraction_float = strtof(fraction_char, NULL);
DataManager::SetProgress(fraction_float);
} else if (strcmp(command, "ui_print") == 0) {
char* display_value = strtok(NULL, "\n");
if (display_value) {
gui_print("%s", display_value);
} else {
gui_print("\n");
}
} else if (strcmp(command, "wipe_cache") == 0) {
*wipe_cache = 1;
} else if (strcmp(command, "clear_display") == 0) {
// Do nothing, not supported by TWRP
} else {
LOGERR("unknown command [%s]\n", command);
}
}
fclose(child_data);
waitpid(pid, &status, 0);
switch_to_new_properties();
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
LOGERR("Error executing updater binary in zip '%s'\n", path);
return INSTALL_ERROR;
}
return INSTALL_SUCCESS;
}
extern "C" int TWinstall_zip(const char* path, int* wipe_cache) {
int ret_val, zip_verify, md5_return, key_count;
twrpDigest md5sum;
string strpath = path;
ZipArchive Zip;
gui_print("Installing '%s'...\nChecking for MD5 file...\n", path);
md5sum.setfn(strpath);
md5_return = md5sum.verify_md5digest();
if (md5_return == -2) {
// MD5 did not match.
LOGERR("Zip MD5 does not match.\nUnable to install zip.\n");
return INSTALL_CORRUPT;
} else if (md5_return == -1) {
gui_print("Skipping MD5 check: no MD5 file found.\n");
} else if (md5_return == 0)
gui_print("Zip MD5 matched.\n"); // MD5 found and matched.
DataManager::GetValue(TW_SIGNED_ZIP_VERIFY_VAR, zip_verify);
DataManager::SetProgress(0);
if (zip_verify) {
gui_print("Verifying zip signature...\n");
ret_val = verify_file(path);
if (ret_val != VERIFY_SUCCESS) {
LOGERR("Zip signature verification failed: %i\n", ret_val);
return -1;
}
}
ret_val = mzOpenZipArchive(path, &Zip);
if (ret_val != 0) {
LOGERR("Zip file is corrupt!\n", path);
return INSTALL_CORRUPT;
}
return Run_Update_Binary(path, &Zip, wipe_cache);
}
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