1 files changed, 0 insertions, 467 deletions

diff --git a/uncrypt/uncrypt.c b/uncrypt/uncrypt.c
deleted file mode 100644
index 42ae649cc..000000000
--- a/uncrypt/uncrypt.c
+++ /dev/null
@@ -1,467 +0,0 @@
-/*
- * Copyright (C) 2014 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.
- */
-
-// This program takes a file on an ext4 filesystem and produces a list
-// of the blocks that file occupies, which enables the file contents
-// to be read directly from the block device without mounting the
-// filesystem.
-//
-// If the filesystem is using an encrypted block device, it will also
-// read the file and rewrite it to the same blocks of the underlying
-// (unencrypted) block device, so the file contents can be read
-// without the need for the decryption key.
-//
-// The output of this program is a "block map" which looks like this:
-//
-//     /dev/block/platform/msm_sdcc.1/by-name/userdata     # block device
-//     49652 4096                        # file size in bytes, block size
-//     3                                 # count of block ranges
-//     1000 1008                         # block range 0
-//     2100 2102                         # ... block range 1
-//     30 33                             # ... block range 2
-//
-// Each block range represents a half-open interval; the line "30 33"
-// reprents the blocks [30, 31, 32].
-//
-// Recovery can take this block map file and retrieve the underlying
-// file data to use as an update package.
-
-#include <errno.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>
-
-#define LOG_TAG "uncrypt"
-#include <log/log.h>
-#include <cutils/properties.h>
-#include <fs_mgr.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 struct fstab* fstab = NULL;
-
-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 = 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;
-    }
-    return 0;
-}
-
-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.)
-    if ((*ranges)[*range_used*2-2] < 0) {
-        (*ranges)[*range_used*2-2] = new_block;
-        (*ranges)[*range_used*2-1] = new_block;
-    }
-
-    if (new_block == (*ranges)[*range_used*2-1]) {
-        // If the new block comes immediately after the current range,
-        // all we have to do is extend the current range.
-        ++(*ranges)[*range_used*2-1];
-    } else {
-        // We need to start a new range.
-
-        // 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));
-        }
-
-        ++*range_used;
-        (*ranges)[*range_used*2-2] = new_block;
-        (*ranges)[*range_used*2-1] = new_block+1;
-    }
-}
-
-static struct fstab* read_fstab()
-{
-    fstab = NULL;
-
-    // The fstab path is always "/fstab.${ro.hardware}".
-    char fstab_path[PATH_MAX+1] = "/fstab.";
-    if (!property_get("ro.hardware", fstab_path+strlen(fstab_path), "")) {
-        ALOGE("failed to get ro.hardware\n");
-        return NULL;
-    }
-
-    fstab = fs_mgr_read_fstab(fstab_path);
-    if (!fstab) {
-        ALOGE("failed to read %s\n", fstab_path);
-        return NULL;
-    }
-
-    return fstab;
-}
-
-const char* find_block_device(const char* path, int* encryptable, int* 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) {
-        struct fstab_rec* v = &fstab->recs[i];
-        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;
-            if (fs_mgr_is_encryptable(v)) {
-                *encryptable = 1;
-                char buffer[PROPERTY_VALUE_MAX+1];
-                if (property_get("ro.crypto.state", buffer, "") &&
-                    strcmp(buffer, "encrypted") == 0) {
-                    *encrypted = 1;
-                }
-            }
-            return v->blk_device;
-        }
-    }
-
-    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()
-{
-    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;
-    }
-    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;
-}
-
-int produce_block_map(const char* path, const char* map_file, const char* blk_dev,
-                      int encrypted)
-{
-    struct stat sb;
-    int ret;
-
-    int mapfd = open(map_file, O_WRONLY | O_CREAT | O_SYNC, S_IRUSR | S_IWUSR);
-    if (mapfd < 0) {
-        ALOGE("failed to open %s\n", map_file);
-        return -1;
-    }
-    FILE* mapf = fdopen(mapfd, "w");
-
-    ret = stat(path, &sb);
-    if (ret != 0) {
-        ALOGE("failed to stat %s\n", path);
-        return -1;
-    }
-
-    ALOGI(" block size: %ld bytes\n", (long)sb.st_blksize);
-
-    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));
-    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);
-        }
-    }
-    int head_block = 0;
-    int head = 0, tail = 0;
-    size_t pos = 0;
-
-    int fd = open(path, O_RDONLY);
-    if (fd < 0) {
-        ALOGE("failed to open fd for reading: %s\n", strerror(errno));
-        return -1;
-    }
-
-    int wfd = -1;
-    if (encrypted) {
-        wfd = open(blk_dev, O_WRONLY | O_SYNC);
-        if (wfd < 0) {
-            ALOGE("failed to open fd for writing: %s\n", strerror(errno));
-            return -1;
-        }
-    }
-
-    while (pos < sb.st_size) {
-        if ((tail+1) % WINDOW_SIZE == head) {
-            // write out head buffer
-            int block = head_block;
-            ret = ioctl(fd, FIBMAP, &block);
-            if (ret != 0) {
-                ALOGE("failed to find block %d\n", head_block);
-                return -1;
-            }
-            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) {
-                    return -1;
-                }
-            }
-            head = (head + 1) % WINDOW_SIZE;
-            ++head_block;
-        }
-
-        // read next block to tail
-        if (encrypted) {
-            size_t so_far = 0;
-            while (so_far < sb.st_blksize && pos < sb.st_size) {
-                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;
-                }
-                so_far += this_read;
-                pos += this_read;
-            }
-        } else {
-            // If we're not encrypting; we don't need to actually read
-            // anything, just skip pos forward as if we'd read a
-            // block.
-            pos += sb.st_blksize;
-        }
-        tail = (tail+1) % WINDOW_SIZE;
-    }
-
-    while (head != tail) {
-        // write out head buffer
-        int block = head_block;
-        ret = ioctl(fd, FIBMAP, &block);
-        if (ret != 0) {
-            ALOGE("failed to find block %d\n", head_block);
-            return -1;
-        }
-        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) {
-                return -1;
-            }
-        }
-        head = (head + 1) % WINDOW_SIZE;
-        ++head_block;
-    }
-
-    fprintf(mapf, "%d\n", range_used);
-    for (i = 0; i < range_used; ++i) {
-        fprintf(mapf, "%d %d\n", ranges[i*2], ranges[i*2+1]);
-    }
-
-    if (fsync(mapfd) == -1) {
-        ALOGE("failed to fsync \"%s\": %s\n", map_file, strerror(errno));
-        return -1;
-    }
-    fclose(mapf);
-    close(fd);
-    if (encrypted) {
-        if (fsync(wfd) == -1) {
-            ALOGE("failed to fsync \"%s\": %s\n", blk_dev, strerror(errno));
-            return -1;
-        }
-        close(wfd);
-    }
-
-    return 0;
-}
-
-void wipe_misc() {
-    ALOGI("removing old commands from misc");
-    int i;
-    for (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) {
-            int fd = open(v->blk_device, O_WRONLY | O_SYNC);
-            uint8_t zeroes[1088];   // sizeof(bootloader_message) from recovery
-            memset(zeroes, 0, sizeof(zeroes));
-
-            size_t written = 0;
-            size_t size = sizeof(zeroes);
-            while (written < size) {
-                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;
-                }
-            }
-            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() {
-    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;
-
-    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 = 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;
-    }
-
-    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));
-        return 1;
-    }
-
-    int encryptable;
-    int encrypted;
-    if (read_fstab() == NULL) {
-        return 1;
-    }
-    const char* blk_dev = find_block_device(path, &encryptable, &encrypted);
-    if (blk_dev == NULL) {
-        ALOGE("failed to find block device for %s", path);
-        return 1;
-    }
-
-    // If the filesystem it's on isn't encrypted, we only produce the
-    // block map, we don't rewrite the file contents (it would be
-    // pointless to do so).
-    ALOGI("encryptable: %s\n", encryptable ? "yes" : "no");
-    ALOGI("  encrypted: %s\n", encrypted ? "yes" : "no");
-
-    // Recovery supports installing packages from 3 paths: /cache,
-    // /data, and /sdcard.  (On a particular device, other locations
-    // may work, but those are three we actually expect.)
-    //
-    // 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 {
-        ALOGI("writing block map %s", map_file);
-        if (produce_block_map(path, map_file, blk_dev, encrypted) != 0) {
-            return 1;
-        }
-        wipe_misc();
-        rename(RECOVERY_COMMAND_FILE_TMP, RECOVERY_COMMAND_FILE);
-    }
-
-    if (do_reboot) reboot_to_recovery();
-    return 0;
-}