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-rw-r--r--uncrypt/uncrypt.cpp (renamed from uncrypt/uncrypt.c)285
1 files changed, 155 insertions, 130 deletions
diff --git a/uncrypt/uncrypt.c b/uncrypt/uncrypt.cpp
index 7fb0989a7..1db3013c6 100644
--- a/uncrypt/uncrypt.c
+++ b/uncrypt/uncrypt.cpp
@@ -39,36 +39,43 @@
// Recovery can take this block map file and retrieve the underlying
// file data to use as an update package.
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <sys/types.h>
-#include <sys/stat.h>
+#include <errno.h>
#include <fcntl.h>
#include <linux/fs.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.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;
-static int write_at_offset(unsigned char* buffer, size_t size,
- int wfd, off64_t offset)
-{
- lseek64(wfd, offset, SEEK_SET);
+static int write_at_offset(unsigned char* buffer, size_t size, int wfd, off64_t offset) {
+ if (TEMP_FAILURE_RETRY(lseek64(wfd, offset, SEEK_SET)) == -1) {
+ ALOGE("error seeking to offset %lld: %s\n", offset, strerror(errno));
+ return -1;
+ }
size_t written = 0;
while (written < size) {
- ssize_t wrote = write(wfd, buffer + written, size - written);
- if (wrote < 0) {
- ALOGE("error writing offset %lld: %s\n", offset, strerror(errno));
+ ssize_t wrote = TEMP_FAILURE_RETRY(write(wfd, buffer + written, size - written));
+ if (wrote == -1) {
+ ALOGE("error writing offset %lld: %s\n", (offset + written), strerror(errno));
return -1;
}
written += wrote;
@@ -76,8 +83,7 @@ static int write_at_offset(unsigned char* buffer, size_t size,
return 0;
}
-void add_block_to_ranges(int** ranges, int* range_alloc, int* range_used, int new_block)
-{
+static void add_block_to_ranges(int** ranges, int* range_alloc, int* range_used, int new_block) {
// If the current block start is < 0, set the start to the new
// block. (This only happens for the very first block of the very
// first range.)
@@ -96,7 +102,7 @@ void add_block_to_ranges(int** ranges, int* range_alloc, int* range_used, int ne
// If there isn't enough room in the array, we need to expand it.
if (*range_used >= *range_alloc) {
*range_alloc *= 2;
- *ranges = realloc(*ranges, *range_alloc * 2 * sizeof(int));
+ *ranges = reinterpret_cast<int*>(realloc(*ranges, *range_alloc * 2 * sizeof(int)));
}
++*range_used;
@@ -105,8 +111,7 @@ void add_block_to_ranges(int** ranges, int* range_alloc, int* range_used, int ne
}
}
-static struct fstab* read_fstab()
-{
+static struct fstab* read_fstab() {
fstab = NULL;
// The fstab path is always "/fstab.${ro.hardware}".
@@ -125,26 +130,26 @@ static struct fstab* read_fstab()
return fstab;
}
-const char* find_block_device(const char* path, int* encryptable, int* encrypted)
-{
+static const char* find_block_device(const char* path, bool* encryptable, bool* encrypted) {
// Look for a volume whose mount point is the prefix of path and
// return its block device. Set encrypted if it's currently
// encrypted.
- int i;
- for (i = 0; i < fstab->num_entries; ++i) {
+ for (int i = 0; i < fstab->num_entries; ++i) {
struct fstab_rec* v = &fstab->recs[i];
- if (!v->mount_point) continue;
+ if (!v->mount_point) {
+ continue;
+ }
int len = strlen(v->mount_point);
if (strncmp(path, v->mount_point, len) == 0 &&
(path[len] == '/' || path[len] == 0)) {
- *encrypted = 0;
- *encryptable = 0;
+ *encrypted = false;
+ *encryptable = false;
if (fs_mgr_is_encryptable(v)) {
- *encryptable = 1;
+ *encryptable = true;
char buffer[PROPERTY_VALUE_MAX+1];
if (property_get("ro.crypto.state", buffer, "") &&
strcmp(buffer, "encrypted") == 0) {
- *encrypted = 1;
+ *encrypted = true;
}
}
return v->blk_device;
@@ -154,56 +159,37 @@ const char* find_block_device(const char* path, int* encryptable, int* encrypted
return NULL;
}
-char* parse_recovery_command_file()
+// Parse uncrypt_file to find the update package name.
+static bool find_uncrypt_package(std::string& package_name)
{
- char* fn = NULL;
- int count = 0;
- char temp[1024];
-
- FILE* f = fopen(RECOVERY_COMMAND_FILE, "r");
- if (f == NULL) {
- return NULL;
- }
- 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;
+ if (!android::base::ReadFileToString(uncrypt_file, &package_name)) {
+ ALOGE("failed to open \"%s\": %s\n", uncrypt_file.c_str(), strerror(errno));
+ return false;
}
- FILE* fo = fdopen(fd, "w");
- while (fgets(temp, sizeof(temp), f)) {
- printf("read: %s", temp);
- if (strncmp(temp, "--update_package=/data/", strlen("--update_package=/data/")) == 0) {
- fn = strdup(temp + strlen("--update_package="));
- strcpy(temp, "--update_package=@" CACHE_BLOCK_MAP "\n");
- }
- fputs(temp, fo);
- }
- fclose(f);
- fsync(fd);
- fclose(fo);
+ // Remove the trailing '\n' if present.
+ package_name = android::base::Trim(package_name);
- if (fn) {
- char* newline = strchr(fn, '\n');
- if (newline) *newline = 0;
- }
- return fn;
+ return true;
}
-int produce_block_map(const char* path, const char* map_file, const char* blk_dev,
- int encrypted)
-{
- struct stat sb;
- int ret;
-
+static int produce_block_map(const char* path, const char* map_file, const char* blk_dev,
+ 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");
- ret = stat(path, &sb);
+ // 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) {
ALOGE("failed to stat %s\n", path);
return -1;
@@ -214,20 +200,18 @@ int produce_block_map(const char* path, const char* map_file, const char* blk_de
int blocks = ((sb.st_size-1) / sb.st_blksize) + 1;
ALOGI(" file size: %lld bytes, %d blocks\n", (long long)sb.st_size, blocks);
- int* ranges;
int range_alloc = 1;
int range_used = 1;
- ranges = malloc(range_alloc * 2 * sizeof(int));
+ int* ranges = reinterpret_cast<int*>(malloc(range_alloc * 2 * sizeof(int)));
ranges[0] = -1;
ranges[1] = -1;
fprintf(mapf, "%s\n%lld %lu\n", blk_dev, (long long)sb.st_size, (unsigned long)sb.st_blksize);
unsigned char* buffers[WINDOW_SIZE];
- int i;
if (encrypted) {
- for (i = 0; i < WINDOW_SIZE; ++i) {
- buffers[i] = malloc(sb.st_blksize);
+ for (size_t i = 0; i < WINDOW_SIZE; ++i) {
+ buffers[i] = reinterpret_cast<unsigned char*>(malloc(sb.st_blksize));
}
}
int head_block = 0;
@@ -239,7 +223,6 @@ int produce_block_map(const char* path, const char* map_file, const char* blk_de
ALOGE("failed to open fd for reading: %s\n", strerror(errno));
return -1;
}
- fsync(fd);
int wfd = -1;
if (encrypted) {
@@ -250,7 +233,15 @@ int produce_block_map(const char* path, const char* map_file, const char* blk_de
}
}
+ 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;
@@ -261,7 +252,8 @@ int produce_block_map(const char* path, const char* map_file, const char* blk_de
}
add_block_to_ranges(&ranges, &range_alloc, &range_used, block);
if (encrypted) {
- if (write_at_offset(buffers[head], sb.st_blksize, wfd, (off64_t)sb.st_blksize * block) != 0) {
+ if (write_at_offset(buffers[head], sb.st_blksize, wfd,
+ (off64_t)sb.st_blksize * block) != 0) {
return -1;
}
}
@@ -273,8 +265,9 @@ int produce_block_map(const char* path, const char* map_file, const char* blk_de
if (encrypted) {
size_t so_far = 0;
while (so_far < sb.st_blksize && pos < sb.st_size) {
- ssize_t this_read = read(fd, buffers[tail] + so_far, sb.st_blksize - so_far);
- if (this_read < 0) {
+ ssize_t this_read =
+ TEMP_FAILURE_RETRY(read(fd, buffers[tail] + so_far, sb.st_blksize - so_far));
+ if (this_read == -1) {
ALOGE("failed to read: %s\n", strerror(errno));
return -1;
}
@@ -300,7 +293,8 @@ int produce_block_map(const char* path, const char* map_file, const char* blk_de
}
add_block_to_ranges(&ranges, &range_alloc, &range_used, block);
if (encrypted) {
- if (write_at_offset(buffers[head], sb.st_blksize, wfd, (off64_t)sb.st_blksize * block) != 0) {
+ if (write_at_offset(buffers[head], sb.st_blksize, wfd,
+ (off64_t)sb.st_blksize * block) != 0) {
return -1;
}
}
@@ -309,25 +303,30 @@ int produce_block_map(const char* path, const char* map_file, const char* blk_de
}
fprintf(mapf, "%d\n", range_used);
- for (i = 0; i < range_used; ++i) {
+ for (int i = 0; i < range_used; ++i) {
fprintf(mapf, "%d %d\n", ranges[i*2], ranges[i*2+1]);
}
- fsync(mapfd);
+ if (fsync(mapfd) == -1) {
+ ALOGE("failed to fsync \"%s\": %s\n", map_file, strerror(errno));
+ return -1;
+ }
fclose(mapf);
close(fd);
if (encrypted) {
- fsync(wfd);
+ if (fsync(wfd) == -1) {
+ ALOGE("failed to fsync \"%s\": %s\n", blk_dev, strerror(errno));
+ return -1;
+ }
close(wfd);
}
return 0;
}
-void wipe_misc() {
+static void wipe_misc() {
ALOGI("removing old commands from misc");
- int i;
- for (i = 0; i < fstab->num_entries; ++i) {
+ for (int i = 0; i < fstab->num_entries; ++i) {
struct fstab_rec* v = &fstab->recs[i];
if (!v->mount_point) continue;
if (strcmp(v->mount_point, "/misc") == 0) {
@@ -338,72 +337,49 @@ void wipe_misc() {
size_t written = 0;
size_t size = sizeof(zeroes);
while (written < size) {
- ssize_t w = write(fd, zeroes, size-written);
- if (w < 0 && errno != EINTR) {
+ ssize_t w = TEMP_FAILURE_RETRY(write(fd, zeroes, size-written));
+ if (w == -1) {
ALOGE("zero write failed: %s\n", strerror(errno));
return;
} else {
written += w;
}
}
- fsync(fd);
+ if (fsync(fd) == -1) {
+ ALOGE("failed to fsync \"%s\": %s\n", v->blk_device, strerror(errno));
+ close(fd);
+ return;
+ }
close(fd);
}
}
}
-void reboot_to_recovery() {
+static void reboot_to_recovery() {
ALOGI("rebooting to recovery");
property_set("sys.powerctl", "reboot,recovery");
sleep(10);
ALOGE("reboot didn't succeed?");
}
-int main(int argc, char** argv)
-{
- const char* input_path;
- const char* map_file;
- int do_reboot = 1;
+int uncrypt(const char* input_path, const char* map_file, int status_fd) {
- 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 = 0;
- } else {
- input_path = parse_recovery_command_file();
- 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;
- }
-
- 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;
}
- int encryptable;
- int encrypted;
if (read_fstab() == NULL) {
return 1;
}
+
+ bool encryptable;
+ bool encrypted;
const char* blk_dev = find_block_device(path, &encryptable, &encrypted);
if (blk_dev == NULL) {
ALOGE("failed to find block device for %s", path);
@@ -423,18 +399,67 @@ 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);
- } 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) reboot_to_recovery();
+ 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 {
+ // 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;
+ }
+
+ 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 {
+ std::string package;
+ if (!find_uncrypt_package(package)) {
+ android::base::WriteStringToFd("-1\n", status_fd);
+ close(status_fd);
+ return 1;
+ }
+ input_path = package.c_str();
+ map_file = cache_block_map.c_str();
+ }
+
+ 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 2024-11-08 15:01:59 +0100