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-rw-r--r--uncrypt/uncrypt.cpp191
1 files changed, 94 insertions, 97 deletions
diff --git a/uncrypt/uncrypt.cpp b/uncrypt/uncrypt.cpp
index 11766f14c..6e670a449 100644
--- a/uncrypt/uncrypt.cpp
+++ b/uncrypt/uncrypt.cpp
@@ -40,25 +40,29 @@
// file data to use as an update package.
#include <errno.h>
+#include <fcntl.h>
+#include <linux/fs.h>
+#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <stdarg.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <linux/fs.h>
#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
-#define LOG_TAG "uncrypt"
-#include <log/log.h>
+#include <base/file.h>
+#include <base/strings.h>
#include <cutils/properties.h>
#include <fs_mgr.h>
+#define LOG_TAG "uncrypt"
+#include <log/log.h>
#define WINDOW_SIZE 5
-#define RECOVERY_COMMAND_FILE "/cache/recovery/command"
-#define RECOVERY_COMMAND_FILE_TMP "/cache/recovery/command.tmp"
-#define CACHE_BLOCK_MAP "/cache/recovery/block.map"
+
+static const std::string cache_block_map = "/cache/recovery/block.map";
+static const std::string status_file = "/cache/recovery/uncrypt_status";
+static const std::string uncrypt_file = "/cache/recovery/uncrypt_file";
static struct fstab* fstab = NULL;
@@ -155,65 +159,35 @@ static const char* find_block_device(const char* path, bool* encryptable, bool*
return NULL;
}
-// Parse the command file RECOVERY_COMMAND_FILE to find the update package
-// name. If it's on the /data partition, replace the package name with the
-// block map file name and store it temporarily in RECOVERY_COMMAND_FILE_TMP.
-// It will be renamed to RECOVERY_COMMAND_FILE if uncrypt finishes
-// successfully.
-static char* find_update_package()
+// Parse uncrypt_file to find the update package name.
+static bool find_uncrypt_package(std::string& package_name)
{
- FILE* f = fopen(RECOVERY_COMMAND_FILE, "r");
- if (f == NULL) {
- return NULL;
+ if (!android::base::ReadFileToString(uncrypt_file, &package_name)) {
+ ALOGE("failed to open \"%s\": %s\n", uncrypt_file.c_str(), strerror(errno));
+ return false;
}
- int fd = open(RECOVERY_COMMAND_FILE_TMP, O_WRONLY | O_CREAT | O_SYNC, S_IRUSR | S_IWUSR);
- if (fd < 0) {
- ALOGE("failed to open %s\n", RECOVERY_COMMAND_FILE_TMP);
- return NULL;
- }
- FILE* fo = fdopen(fd, "w");
- char* fn = NULL;
- char* line = NULL;
- size_t len = 0;
- while (getline(&line, &len, f) != -1) {
- if (strncmp(line, "--update_package=", strlen("--update_package=")) == 0) {
- fn = strdup(line + strlen("--update_package="));
- // Replace the package name with block map file if it's on /data partition.
- if (strncmp(fn, "/data/", strlen("/data/")) == 0) {
- fputs("--update_package=@" CACHE_BLOCK_MAP "\n", fo);
- continue;
- }
- }
- fputs(line, fo);
- }
- free(line);
- fclose(f);
- if (fsync(fd) == -1) {
- ALOGE("failed to fsync \"%s\": %s\n", RECOVERY_COMMAND_FILE_TMP, strerror(errno));
- fclose(fo);
- return NULL;
- }
- fclose(fo);
- if (fn) {
- char* newline = strchr(fn, '\n');
- if (newline) {
- *newline = 0;
- }
- }
- return fn;
+ // Remove the trailing '\n' if present.
+ package_name = android::base::Trim(package_name);
+
+ return true;
}
static int produce_block_map(const char* path, const char* map_file, const char* blk_dev,
- bool encrypted) {
-
+ bool encrypted, int status_fd) {
int mapfd = open(map_file, O_WRONLY | O_CREAT | O_SYNC, S_IRUSR | S_IWUSR);
- if (mapfd < 0) {
+ if (mapfd == -1) {
ALOGE("failed to open %s\n", map_file);
return -1;
}
FILE* mapf = fdopen(mapfd, "w");
+ // Make sure we can write to the status_file.
+ if (!android::base::WriteStringToFd("0\n", status_fd)) {
+ ALOGE("failed to update \"%s\"\n", status_file.c_str());
+ return -1;
+ }
+
struct stat sb;
int ret = stat(path, &sb);
if (ret != 0) {
@@ -259,7 +233,15 @@ static int produce_block_map(const char* path, const char* map_file, const char*
}
}
+ int last_progress = 0;
while (pos < sb.st_size) {
+ // Update the status file, progress must be between [0, 99].
+ int progress = static_cast<int>(100 * (double(pos) / double(sb.st_size)));
+ if (progress > last_progress) {
+ last_progress = progress;
+ android::base::WriteStringToFd(std::to_string(progress) + "\n", status_fd);
+ }
+
if ((tail+1) % WINDOW_SIZE == head) {
// write out head buffer
int block = head_block;
@@ -380,43 +362,15 @@ static void reboot_to_recovery() {
ALOGE("reboot didn't succeed?");
}
-int main(int argc, char** argv)
-{
- const char* input_path;
- const char* map_file;
- bool do_reboot = true;
-
- if (argc != 1 && argc != 3) {
- fprintf(stderr, "usage: %s [<transform_path> <map_file>]\n", argv[0]);
- return 2;
- }
-
- if (argc == 3) {
- // when command-line args are given this binary is being used
- // for debugging; don't reboot to recovery at the end.
- input_path = argv[1];
- map_file = argv[2];
- do_reboot = false;
- } else {
- input_path = find_update_package();
- if (input_path == NULL) {
- // if we're rebooting to recovery without a package (say,
- // to wipe data), then we don't need to do anything before
- // going to recovery.
- ALOGI("no recovery command file or no update package arg");
- reboot_to_recovery();
- return 1;
- }
- map_file = CACHE_BLOCK_MAP;
- }
+int uncrypt(const char* input_path, const char* map_file, int status_fd) {
- ALOGI("update package is %s", input_path);
+ ALOGI("update package is \"%s\"", input_path);
// Turn the name of the file we're supposed to convert into an
// absolute path, so we can find what filesystem it's on.
char path[PATH_MAX+1];
if (realpath(input_path, path) == NULL) {
- ALOGE("failed to convert %s to absolute path: %s", input_path, strerror(errno));
+ ALOGE("failed to convert \"%s\" to absolute path: %s", input_path, strerror(errno));
return 1;
}
@@ -445,21 +399,64 @@ int main(int argc, char** argv)
// On /data we want to convert the file to a block map so that we
// can read the package without mounting the partition. On /cache
// and /sdcard we leave the file alone.
- if (strncmp(path, "/data/", 6) != 0) {
- // path does not start with "/data/"; leave it alone.
- unlink(RECOVERY_COMMAND_FILE_TMP);
- wipe_misc();
- } else {
+ if (strncmp(path, "/data/", 6) == 0) {
ALOGI("writing block map %s", map_file);
- if (produce_block_map(path, map_file, blk_dev, encrypted) != 0) {
+ if (produce_block_map(path, map_file, blk_dev, encrypted, status_fd) != 0) {
return 1;
}
- wipe_misc();
- rename(RECOVERY_COMMAND_FILE_TMP, RECOVERY_COMMAND_FILE);
}
- if (do_reboot) {
+ return 0;
+}
+
+int main(int argc, char** argv) {
+ const char* input_path;
+ const char* map_file;
+
+ if (argc != 3 && argc != 1 && (argc == 2 && strcmp(argv[1], "--reboot") != 0)) {
+ fprintf(stderr, "usage: %s [--reboot] [<transform_path> <map_file>]\n", argv[0]);
+ return 2;
+ }
+
+ // When uncrypt is started with "--reboot", it wipes misc and reboots.
+ // Otherwise it uncrypts the package and writes the block map.
+ if (argc == 2) {
+ if (read_fstab() == NULL) {
+ return 1;
+ }
+ wipe_misc();
reboot_to_recovery();
+ } else {
+ std::string package;
+ if (argc == 3) {
+ // when command-line args are given this binary is being used
+ // for debugging.
+ input_path = argv[1];
+ map_file = argv[2];
+ } else {
+ if (!find_uncrypt_package(package)) {
+ return 1;
+ }
+ input_path = package.c_str();
+ map_file = cache_block_map.c_str();
+ }
+
+ // The pipe has been created by the system server.
+ int status_fd = open(status_file.c_str(), O_WRONLY | O_CREAT | O_SYNC, S_IRUSR | S_IWUSR);
+ if (status_fd == -1) {
+ ALOGE("failed to open pipe \"%s\": %s\n", status_file.c_str(), strerror(errno));
+ return 1;
+ }
+ int status = uncrypt(input_path, map_file, status_fd);
+ if (status != 0) {
+ android::base::WriteStringToFd("-1\n", status_fd);
+ close(status_fd);
+ return 1;
+ }
+
+ android::base::WriteStringToFd("100\n", status_fd);
+ close(status_fd);
}
+
return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 08:52:19 +0100