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-rwxr-xr-xupdater/blockimg.cpp1892
1 files changed, 1892 insertions, 0 deletions
diff --git a/updater/blockimg.cpp b/updater/blockimg.cpp
new file mode 100755
index 000000000..7da9adf5f
--- /dev/null
+++ b/updater/blockimg.cpp
@@ -0,0 +1,1892 @@
+/*
+ * 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.
+ */
+
+#include <ctype.h>
+#include <errno.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <linux/fs.h>
+#include <pthread.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/ioctl.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <memory>
+#include <string>
+
+#include <base/strings.h>
+
+#include "applypatch/applypatch.h"
+#include "edify/expr.h"
+#include "mincrypt/sha.h"
+#include "minzip/Hash.h"
+#include "updater.h"
+#include "print_sha1.h"
+
+#define BLOCKSIZE 4096
+
+// Set this to 0 to interpret 'erase' transfers to mean do a
+// BLKDISCARD ioctl (the normal behavior). Set to 1 to interpret
+// erase to mean fill the region with zeroes.
+#define DEBUG_ERASE 0
+
+#define STASH_DIRECTORY_BASE "/cache/recovery"
+#define STASH_DIRECTORY_MODE 0700
+#define STASH_FILE_MODE 0600
+
+typedef struct {
+ size_t count;
+ size_t size;
+ size_t pos[0]; // Actual limit is INT_MAX.
+} RangeSet;
+
+#define RANGESET_MAX_POINTS \
+ ((int)((INT_MAX / sizeof(int)) - sizeof(RangeSet)))
+
+static RangeSet* parse_range(char* text) {
+ char* save;
+ char* token;
+ int num;
+ long int val;
+ RangeSet* out = NULL;
+ size_t bufsize;
+
+ if (!text) {
+ goto err;
+ }
+
+ token = strtok_r(text, ",", &save);
+
+ if (!token) {
+ goto err;
+ }
+
+ errno = 0;
+ val = strtol(token, NULL, 0);
+
+ if (errno != 0 || val < 2 || val > RANGESET_MAX_POINTS) {
+ goto err;
+ } else if (val % 2) {
+ goto err; // must be even
+ }
+
+ num = (int) val;
+ bufsize = sizeof(RangeSet) + num * sizeof(size_t);
+
+ out = reinterpret_cast<RangeSet*>(malloc(bufsize));
+
+ if (!out) {
+ fprintf(stderr, "failed to allocate range of %zu bytes\n", bufsize);
+ goto err;
+ }
+
+ out->count = num / 2;
+ out->size = 0;
+
+ for (int i = 0; i < num; i += 2) {
+ token = strtok_r(NULL, ",", &save);
+
+ if (!token) {
+ goto err;
+ }
+
+ errno = 0;
+ val = strtol(token, NULL, 0);
+
+ if (errno != 0 || val < 0 || val > INT_MAX) {
+ goto err;
+ }
+
+ out->pos[i] = static_cast<size_t>(val);
+
+ token = strtok_r(NULL, ",", &save);
+
+ if (!token) {
+ goto err;
+ }
+
+ errno = 0;
+ val = strtol(token, NULL, 0);
+
+ if (errno != 0 || val < 0 || val > INT_MAX) {
+ goto err;
+ }
+
+ out->pos[i+1] = static_cast<size_t>(val);
+
+ if (out->pos[i] >= out->pos[i+1]) {
+ goto err; // empty or negative range
+ }
+
+ size_t rs = out->pos[i+1] - out->pos[i];
+ if (out->size > SIZE_MAX - rs) {
+ goto err; // overflow
+ }
+
+ out->size += rs;
+ }
+
+ if (out->size == 0) {
+ goto err;
+ }
+
+ return out;
+
+err:
+ fprintf(stderr, "failed to parse range '%s'\n", text ? text : "NULL");
+ exit(1);
+}
+
+static bool range_overlaps(const RangeSet& r1, const RangeSet& r2) {
+ for (size_t i = 0; i < r1.count; ++i) {
+ size_t r1_0 = r1.pos[i * 2];
+ size_t r1_1 = r1.pos[i * 2 + 1];
+
+ for (size_t j = 0; j < r2.count; ++j) {
+ size_t r2_0 = r2.pos[j * 2];
+ size_t r2_1 = r2.pos[j * 2 + 1];
+
+ if (!(r2_0 >= r1_1 || r1_0 >= r2_1)) {
+ return true;
+ }
+ }
+ }
+
+ return false;
+}
+
+static int read_all(int fd, uint8_t* data, size_t size) {
+ size_t so_far = 0;
+ while (so_far < size) {
+ ssize_t r = TEMP_FAILURE_RETRY(read(fd, data+so_far, size-so_far));
+ if (r == -1) {
+ fprintf(stderr, "read failed: %s\n", strerror(errno));
+ return -1;
+ }
+ so_far += r;
+ }
+ return 0;
+}
+
+static int write_all(int fd, const uint8_t* data, size_t size) {
+ size_t written = 0;
+ while (written < size) {
+ ssize_t w = TEMP_FAILURE_RETRY(write(fd, data+written, size-written));
+ if (w == -1) {
+ fprintf(stderr, "write failed: %s\n", strerror(errno));
+ return -1;
+ }
+ written += w;
+ }
+
+ return 0;
+}
+
+static bool check_lseek(int fd, off64_t offset, int whence) {
+ off64_t rc = TEMP_FAILURE_RETRY(lseek64(fd, offset, whence));
+ if (rc == -1) {
+ fprintf(stderr, "lseek64 failed: %s\n", strerror(errno));
+ return false;
+ }
+ return true;
+}
+
+static void allocate(size_t size, uint8_t** buffer, size_t* buffer_alloc) {
+ // if the buffer's big enough, reuse it.
+ if (size <= *buffer_alloc) return;
+
+ free(*buffer);
+
+ *buffer = (uint8_t*) malloc(size);
+ if (*buffer == NULL) {
+ fprintf(stderr, "failed to allocate %zu bytes\n", size);
+ exit(1);
+ }
+ *buffer_alloc = size;
+}
+
+typedef struct {
+ int fd;
+ RangeSet* tgt;
+ size_t p_block;
+ size_t p_remain;
+} RangeSinkState;
+
+static ssize_t RangeSinkWrite(const uint8_t* data, ssize_t size, void* token) {
+ RangeSinkState* rss = (RangeSinkState*) token;
+
+ if (rss->p_remain <= 0) {
+ fprintf(stderr, "range sink write overrun");
+ return 0;
+ }
+
+ ssize_t written = 0;
+ while (size > 0) {
+ size_t write_now = size;
+
+ if (rss->p_remain < write_now) {
+ write_now = rss->p_remain;
+ }
+
+ if (write_all(rss->fd, data, write_now) == -1) {
+ break;
+ }
+
+ data += write_now;
+ size -= write_now;
+
+ rss->p_remain -= write_now;
+ written += write_now;
+
+ if (rss->p_remain == 0) {
+ // move to the next block
+ ++rss->p_block;
+ if (rss->p_block < rss->tgt->count) {
+ rss->p_remain = (rss->tgt->pos[rss->p_block * 2 + 1] -
+ rss->tgt->pos[rss->p_block * 2]) * BLOCKSIZE;
+
+ if (!check_lseek(rss->fd, (off64_t)rss->tgt->pos[rss->p_block*2] * BLOCKSIZE,
+ SEEK_SET)) {
+ break;
+ }
+ } else {
+ // we can't write any more; return how many bytes have
+ // been written so far.
+ break;
+ }
+ }
+ }
+
+ return written;
+}
+
+// All of the data for all the 'new' transfers is contained in one
+// file in the update package, concatenated together in the order in
+// which transfers.list will need it. We want to stream it out of the
+// archive (it's compressed) without writing it to a temp file, but we
+// can't write each section until it's that transfer's turn to go.
+//
+// To achieve this, we expand the new data from the archive in a
+// background thread, and block that threads 'receive uncompressed
+// data' function until the main thread has reached a point where we
+// want some new data to be written. We signal the background thread
+// with the destination for the data and block the main thread,
+// waiting for the background thread to complete writing that section.
+// Then it signals the main thread to wake up and goes back to
+// blocking waiting for a transfer.
+//
+// NewThreadInfo is the struct used to pass information back and forth
+// between the two threads. When the main thread wants some data
+// written, it sets rss to the destination location and signals the
+// condition. When the background thread is done writing, it clears
+// rss and signals the condition again.
+
+typedef struct {
+ ZipArchive* za;
+ const ZipEntry* entry;
+
+ RangeSinkState* rss;
+
+ pthread_mutex_t mu;
+ pthread_cond_t cv;
+} NewThreadInfo;
+
+static bool receive_new_data(const unsigned char* data, int size, void* cookie) {
+ NewThreadInfo* nti = (NewThreadInfo*) cookie;
+
+ while (size > 0) {
+ // Wait for nti->rss to be non-NULL, indicating some of this
+ // data is wanted.
+ pthread_mutex_lock(&nti->mu);
+ while (nti->rss == NULL) {
+ pthread_cond_wait(&nti->cv, &nti->mu);
+ }
+ pthread_mutex_unlock(&nti->mu);
+
+ // At this point nti->rss is set, and we own it. The main
+ // thread is waiting for it to disappear from nti.
+ ssize_t written = RangeSinkWrite(data, size, nti->rss);
+ data += written;
+ size -= written;
+
+ if (nti->rss->p_block == nti->rss->tgt->count) {
+ // we have written all the bytes desired by this rss.
+
+ pthread_mutex_lock(&nti->mu);
+ nti->rss = NULL;
+ pthread_cond_broadcast(&nti->cv);
+ pthread_mutex_unlock(&nti->mu);
+ }
+ }
+
+ return true;
+}
+
+static void* unzip_new_data(void* cookie) {
+ NewThreadInfo* nti = (NewThreadInfo*) cookie;
+ mzProcessZipEntryContents(nti->za, nti->entry, receive_new_data, nti);
+ return NULL;
+}
+
+static int ReadBlocks(RangeSet* src, uint8_t* buffer, int fd) {
+ size_t p = 0;
+
+ if (!src || !buffer) {
+ return -1;
+ }
+
+ for (size_t i = 0; i < src->count; ++i) {
+ if (!check_lseek(fd, (off64_t) src->pos[i * 2] * BLOCKSIZE, SEEK_SET)) {
+ return -1;
+ }
+
+ size_t size = (src->pos[i * 2 + 1] - src->pos[i * 2]) * BLOCKSIZE;
+
+ if (read_all(fd, buffer + p, size) == -1) {
+ return -1;
+ }
+
+ p += size;
+ }
+
+ return 0;
+}
+
+static int WriteBlocks(RangeSet* tgt, uint8_t* buffer, int fd) {
+ size_t p = 0;
+
+ if (!tgt || !buffer) {
+ return -1;
+ }
+
+ for (size_t i = 0; i < tgt->count; ++i) {
+ if (!check_lseek(fd, (off64_t) tgt->pos[i * 2] * BLOCKSIZE, SEEK_SET)) {
+ return -1;
+ }
+
+ size_t size = (tgt->pos[i * 2 + 1] - tgt->pos[i * 2]) * BLOCKSIZE;
+
+ if (write_all(fd, buffer + p, size) == -1) {
+ return -1;
+ }
+
+ p += size;
+ }
+
+ return 0;
+}
+
+// Do a source/target load for move/bsdiff/imgdiff in version 1.
+// 'wordsave' is the save_ptr of a strtok_r()-in-progress. We expect
+// to parse the remainder of the string as:
+//
+// <src_range> <tgt_range>
+//
+// The source range is loaded into the provided buffer, reallocating
+// it to make it larger if necessary. The target ranges are returned
+// in *tgt, if tgt is non-NULL.
+
+static int LoadSrcTgtVersion1(char** wordsave, RangeSet** tgt, int* src_blocks,
+ uint8_t** buffer, size_t* buffer_alloc, int fd) {
+ char* word;
+ int rc;
+
+ word = strtok_r(NULL, " ", wordsave);
+ RangeSet* src = parse_range(word);
+
+ if (tgt != NULL) {
+ word = strtok_r(NULL, " ", wordsave);
+ *tgt = parse_range(word);
+ }
+
+ allocate(src->size * BLOCKSIZE, buffer, buffer_alloc);
+ rc = ReadBlocks(src, *buffer, fd);
+ *src_blocks = src->size;
+
+ free(src);
+ return rc;
+}
+
+static int VerifyBlocks(const char *expected, const uint8_t *buffer,
+ size_t blocks, bool printerror) {
+ int rc = -1;
+ uint8_t digest[SHA_DIGEST_SIZE];
+
+ if (!expected || !buffer) {
+ return rc;
+ }
+
+ SHA_hash(buffer, blocks * BLOCKSIZE, digest);
+
+ std::string hexdigest = print_sha1(digest);
+
+ rc = hexdigest != std::string(expected);
+
+ if (rc != 0 && printerror) {
+ fprintf(stderr, "failed to verify blocks (expected %s, read %s)\n",
+ expected, hexdigest.c_str());
+ }
+
+ return rc;
+}
+
+static std::string GetStashFileName(const std::string& base, const std::string id,
+ const std::string postfix) {
+ if (base.empty()) {
+ return "";
+ }
+
+ std::string fn(STASH_DIRECTORY_BASE);
+ fn += "/" + base + "/" + id + postfix;
+
+ return fn;
+}
+
+typedef void (*StashCallback)(const std::string&, void*);
+
+// Does a best effort enumeration of stash files. Ignores possible non-file
+// items in the stash directory and continues despite of errors. Calls the
+// 'callback' function for each file and passes 'data' to the function as a
+// parameter.
+
+static void EnumerateStash(const std::string& dirname, StashCallback callback, void* data) {
+ if (dirname.empty() || callback == NULL) {
+ return;
+ }
+
+ std::unique_ptr<DIR, int(*)(DIR*)> directory(opendir(dirname.c_str()), closedir);
+
+ if (directory == NULL) {
+ if (errno != ENOENT) {
+ fprintf(stderr, "opendir \"%s\" failed: %s\n", dirname.c_str(), strerror(errno));
+ }
+ return;
+ }
+
+ struct dirent* item;
+ while ((item = readdir(directory.get())) != NULL) {
+ if (item->d_type != DT_REG) {
+ continue;
+ }
+
+ std::string fn = dirname + "/" + std::string(item->d_name);
+ callback(fn, data);
+ }
+}
+
+static void UpdateFileSize(const std::string& fn, void* data) {
+ if (fn.empty() || !data) {
+ return;
+ }
+
+ struct stat st;
+ if (stat(fn.c_str(), &st) == -1) {
+ fprintf(stderr, "stat \"%s\" failed: %s\n", fn.c_str(), strerror(errno));
+ return;
+ }
+
+ int* size = reinterpret_cast<int*>(data);
+ *size += st.st_size;
+}
+
+// Deletes the stash directory and all files in it. Assumes that it only
+// contains files. There is nothing we can do about unlikely, but possible
+// errors, so they are merely logged.
+
+static void DeleteFile(const std::string& fn, void* data) {
+ if (!fn.empty()) {
+ fprintf(stderr, "deleting %s\n", fn.c_str());
+
+ if (unlink(fn.c_str()) == -1 && errno != ENOENT) {
+ fprintf(stderr, "unlink \"%s\" failed: %s\n", fn.c_str(), strerror(errno));
+ }
+ }
+}
+
+static void DeletePartial(const std::string& fn, void* data) {
+ if (android::base::EndsWith(fn, ".partial")) {
+ DeleteFile(fn, data);
+ }
+}
+
+static void DeleteStash(const std::string& base) {
+ if (base.empty()) {
+ return;
+ }
+
+ fprintf(stderr, "deleting stash %s\n", base.c_str());
+
+ std::string dirname = GetStashFileName(base, "", "");
+ EnumerateStash(dirname, DeleteFile, NULL);
+
+ if (rmdir(dirname.c_str()) == -1) {
+ if (errno != ENOENT && errno != ENOTDIR) {
+ fprintf(stderr, "rmdir \"%s\" failed: %s\n", dirname.c_str(), strerror(errno));
+ }
+ }
+}
+
+static int LoadStash(const std::string& base, const char* id, int verify, int* blocks,
+ uint8_t** buffer, size_t* buffer_alloc, bool printnoent) {
+ std::string fn;
+ int blockcount = 0;
+ int fd = -1;
+ int rc = -1;
+ int res;
+ struct stat st;
+
+ if (base.empty() || !id || !buffer || !buffer_alloc) {
+ goto lsout;
+ }
+
+ if (!blocks) {
+ blocks = &blockcount;
+ }
+
+ fn = GetStashFileName(base, std::string(id), "");
+
+ res = stat(fn.c_str(), &st);
+
+ if (res == -1) {
+ if (errno != ENOENT || printnoent) {
+ fprintf(stderr, "stat \"%s\" failed: %s\n", fn.c_str(), strerror(errno));
+ }
+ goto lsout;
+ }
+
+ fprintf(stderr, " loading %s\n", fn.c_str());
+
+ if ((st.st_size % BLOCKSIZE) != 0) {
+ fprintf(stderr, "%s size %" PRId64 " not multiple of block size %d",
+ fn.c_str(), static_cast<int64_t>(st.st_size), BLOCKSIZE);
+ goto lsout;
+ }
+
+ fd = TEMP_FAILURE_RETRY(open(fn.c_str(), O_RDONLY));
+
+ if (fd == -1) {
+ fprintf(stderr, "open \"%s\" failed: %s\n", fn.c_str(), strerror(errno));
+ goto lsout;
+ }
+
+ allocate(st.st_size, buffer, buffer_alloc);
+
+ if (read_all(fd, *buffer, st.st_size) == -1) {
+ goto lsout;
+ }
+
+ *blocks = st.st_size / BLOCKSIZE;
+
+ if (verify && VerifyBlocks(id, *buffer, *blocks, true) != 0) {
+ fprintf(stderr, "unexpected contents in %s\n", fn.c_str());
+ DeleteFile(fn, NULL);
+ goto lsout;
+ }
+
+ rc = 0;
+
+lsout:
+ if (fd != -1) {
+ close(fd);
+ }
+
+ return rc;
+}
+
+static int WriteStash(const std::string& base, const char* id, int blocks,
+ uint8_t* buffer, bool checkspace, int *exists) {
+ std::string fn;
+ std::string cn;
+ std::string dname;
+ int fd = -1;
+ int rc = -1;
+ int dfd = -1;
+ int res;
+ struct stat st;
+
+ if (base.empty() || buffer == NULL) {
+ goto wsout;
+ }
+
+ if (checkspace && CacheSizeCheck(blocks * BLOCKSIZE) != 0) {
+ fprintf(stderr, "not enough space to write stash\n");
+ goto wsout;
+ }
+
+ fn = GetStashFileName(base, std::string(id), ".partial");
+ cn = GetStashFileName(base, std::string(id), "");
+
+ if (exists) {
+ res = stat(cn.c_str(), &st);
+
+ if (res == 0) {
+ // The file already exists and since the name is the hash of the contents,
+ // it's safe to assume the contents are identical (accidental hash collisions
+ // are unlikely)
+ fprintf(stderr, " skipping %d existing blocks in %s\n", blocks, cn.c_str());
+ *exists = 1;
+ rc = 0;
+ goto wsout;
+ }
+
+ *exists = 0;
+ }
+
+ fprintf(stderr, " writing %d blocks to %s\n", blocks, cn.c_str());
+
+ fd = TEMP_FAILURE_RETRY(open(fn.c_str(), O_WRONLY | O_CREAT | O_TRUNC, STASH_FILE_MODE));
+
+ if (fd == -1) {
+ fprintf(stderr, "failed to create \"%s\": %s\n", fn.c_str(), strerror(errno));
+ goto wsout;
+ }
+
+ if (write_all(fd, buffer, blocks * BLOCKSIZE) == -1) {
+ goto wsout;
+ }
+
+ if (fsync(fd) == -1) {
+ fprintf(stderr, "fsync \"%s\" failed: %s\n", fn.c_str(), strerror(errno));
+ goto wsout;
+ }
+
+ if (rename(fn.c_str(), cn.c_str()) == -1) {
+ fprintf(stderr, "rename(\"%s\", \"%s\") failed: %s\n", fn.c_str(), cn.c_str(),
+ strerror(errno));
+ goto wsout;
+ }
+
+ dname = GetStashFileName(base, "", "");
+ dfd = TEMP_FAILURE_RETRY(open(dname.c_str(), O_RDONLY | O_DIRECTORY));
+
+ if (dfd == -1) {
+ fprintf(stderr, "failed to open \"%s\" failed: %s\n", dname.c_str(), strerror(errno));
+ goto wsout;
+ }
+
+ if (fsync(dfd) == -1) {
+ fprintf(stderr, "fsync \"%s\" failed: %s\n", dname.c_str(), strerror(errno));
+ goto wsout;
+ }
+
+ rc = 0;
+
+wsout:
+ if (fd != -1) {
+ close(fd);
+ }
+
+ if (dfd != -1) {
+ close(dfd);
+ }
+
+ return rc;
+}
+
+// Creates a directory for storing stash files and checks if the /cache partition
+// hash enough space for the expected amount of blocks we need to store. Returns
+// >0 if we created the directory, zero if it existed already, and <0 of failure.
+
+static int CreateStash(State* state, int maxblocks, const char* blockdev,
+ std::string& base) {
+ if (blockdev == NULL) {
+ return -1;
+ }
+
+ // Stash directory should be different for each partition to avoid conflicts
+ // when updating multiple partitions at the same time, so we use the hash of
+ // the block device name as the base directory
+ SHA_CTX ctx;
+ SHA_init(&ctx);
+ SHA_update(&ctx, blockdev, strlen(blockdev));
+ const uint8_t* digest = SHA_final(&ctx);
+ base = print_sha1(digest);
+
+ std::string dirname = GetStashFileName(base, "", "");
+ struct stat st;
+ int res = stat(dirname.c_str(), &st);
+
+ if (res == -1 && errno != ENOENT) {
+ ErrorAbort(state, "stat \"%s\" failed: %s\n", dirname.c_str(), strerror(errno));
+ return -1;
+ } else if (res != 0) {
+ fprintf(stderr, "creating stash %s\n", dirname.c_str());
+ res = mkdir(dirname.c_str(), STASH_DIRECTORY_MODE);
+
+ if (res != 0) {
+ ErrorAbort(state, "mkdir \"%s\" failed: %s\n", dirname.c_str(), strerror(errno));
+ return -1;
+ }
+
+ if (CacheSizeCheck(maxblocks * BLOCKSIZE) != 0) {
+ ErrorAbort(state, "not enough space for stash\n");
+ return -1;
+ }
+
+ return 1; // Created directory
+ }
+
+ fprintf(stderr, "using existing stash %s\n", dirname.c_str());
+
+ // If the directory already exists, calculate the space already allocated to
+ // stash files and check if there's enough for all required blocks. Delete any
+ // partially completed stash files first.
+
+ EnumerateStash(dirname, DeletePartial, NULL);
+ int size = 0;
+ EnumerateStash(dirname, UpdateFileSize, &size);
+
+ size = (maxblocks * BLOCKSIZE) - size;
+
+ if (size > 0 && CacheSizeCheck(size) != 0) {
+ ErrorAbort(state, "not enough space for stash (%d more needed)\n", size);
+ return -1;
+ }
+
+ return 0; // Using existing directory
+}
+
+static int SaveStash(const std::string& base, char** wordsave, uint8_t** buffer,
+ size_t* buffer_alloc, int fd, bool usehash) {
+ if (!wordsave || !buffer || !buffer_alloc) {
+ return -1;
+ }
+
+ char *id = strtok_r(NULL, " ", wordsave);
+ if (id == NULL) {
+ fprintf(stderr, "missing id field in stash command\n");
+ return -1;
+ }
+
+ int blocks = 0;
+ if (usehash && LoadStash(base, id, 1, &blocks, buffer, buffer_alloc, false) == 0) {
+ // Stash file already exists and has expected contents. Do not
+ // read from source again, as the source may have been already
+ // overwritten during a previous attempt.
+ return 0;
+ }
+
+ if (LoadSrcTgtVersion1(wordsave, NULL, &blocks, buffer, buffer_alloc, fd) == -1) {
+ return -1;
+ }
+
+ if (usehash && VerifyBlocks(id, *buffer, blocks, true) != 0) {
+ // Source blocks have unexpected contents. If we actually need this
+ // data later, this is an unrecoverable error. However, the command
+ // that uses the data may have already completed previously, so the
+ // possible failure will occur during source block verification.
+ fprintf(stderr, "failed to load source blocks for stash %s\n", id);
+ return 0;
+ }
+
+ fprintf(stderr, "stashing %d blocks to %s\n", blocks, id);
+ return WriteStash(base, id, blocks, *buffer, false, NULL);
+}
+
+static int FreeStash(const std::string& base, const char* id) {
+ if (base.empty() || id == NULL) {
+ return -1;
+ }
+
+ std::string fn = GetStashFileName(base, std::string(id), "");
+
+ DeleteFile(fn, NULL);
+
+ return 0;
+}
+
+static void MoveRange(uint8_t* dest, RangeSet* locs, const uint8_t* source) {
+ // source contains packed data, which we want to move to the
+ // locations given in *locs in the dest buffer. source and dest
+ // may be the same buffer.
+
+ int start = locs->size;
+ int i;
+ for (i = locs->count-1; i >= 0; --i) {
+ int blocks = locs->pos[i*2+1] - locs->pos[i*2];
+ start -= blocks;
+ memmove(dest + (locs->pos[i*2] * BLOCKSIZE), source + (start * BLOCKSIZE),
+ blocks * BLOCKSIZE);
+ }
+}
+
+// Do a source/target load for move/bsdiff/imgdiff in version 2.
+// 'wordsave' is the save_ptr of a strtok_r()-in-progress. We expect
+// to parse the remainder of the string as one of:
+//
+// <tgt_range> <src_block_count> <src_range>
+// (loads data from source image only)
+//
+// <tgt_range> <src_block_count> - <[stash_id:stash_range] ...>
+// (loads data from stashes only)
+//
+// <tgt_range> <src_block_count> <src_range> <src_loc> <[stash_id:stash_range] ...>
+// (loads data from both source image and stashes)
+//
+// On return, buffer is filled with the loaded source data (rearranged
+// and combined with stashed data as necessary). buffer may be
+// reallocated if needed to accommodate the source data. *tgt is the
+// target RangeSet. Any stashes required are loaded using LoadStash.
+
+static int LoadSrcTgtVersion2(char** wordsave, RangeSet** tgt, int* src_blocks,
+ uint8_t** buffer, size_t* buffer_alloc, int fd,
+ const std::string& stashbase, bool* overlap) {
+ char* word;
+ char* colonsave;
+ char* colon;
+ int res;
+ RangeSet* locs;
+ size_t stashalloc = 0;
+ uint8_t* stash = NULL;
+
+ if (tgt != NULL) {
+ word = strtok_r(NULL, " ", wordsave);
+ *tgt = parse_range(word);
+ }
+
+ word = strtok_r(NULL, " ", wordsave);
+ *src_blocks = strtol(word, NULL, 0);
+
+ allocate(*src_blocks * BLOCKSIZE, buffer, buffer_alloc);
+
+ word = strtok_r(NULL, " ", wordsave);
+ if (word[0] == '-' && word[1] == '\0') {
+ // no source ranges, only stashes
+ } else {
+ RangeSet* src = parse_range(word);
+ res = ReadBlocks(src, *buffer, fd);
+
+ if (overlap && tgt) {
+ *overlap = range_overlaps(*src, **tgt);
+ }
+
+ free(src);
+
+ if (res == -1) {
+ return -1;
+ }
+
+ word = strtok_r(NULL, " ", wordsave);
+ if (word == NULL) {
+ // no stashes, only source range
+ return 0;
+ }
+
+ locs = parse_range(word);
+ MoveRange(*buffer, locs, *buffer);
+ free(locs);
+ }
+
+ while ((word = strtok_r(NULL, " ", wordsave)) != NULL) {
+ // Each word is a an index into the stash table, a colon, and
+ // then a rangeset describing where in the source block that
+ // stashed data should go.
+ colonsave = NULL;
+ colon = strtok_r(word, ":", &colonsave);
+
+ res = LoadStash(stashbase, colon, 0, NULL, &stash, &stashalloc, true);
+
+ if (res == -1) {
+ // These source blocks will fail verification if used later, but we
+ // will let the caller decide if this is a fatal failure
+ fprintf(stderr, "failed to load stash %s\n", colon);
+ continue;
+ }
+
+ colon = strtok_r(NULL, ":", &colonsave);
+ locs = parse_range(colon);
+
+ MoveRange(*buffer, locs, stash);
+ free(locs);
+ }
+
+ if (stash) {
+ free(stash);
+ }
+
+ return 0;
+}
+
+// Parameters for transfer list command functions
+typedef struct {
+ char* cmdname;
+ char* cpos;
+ char* freestash;
+ std::string stashbase;
+ bool canwrite;
+ int createdstash;
+ int fd;
+ int foundwrites;
+ bool isunresumable;
+ int version;
+ int written;
+ NewThreadInfo nti;
+ pthread_t thread;
+ size_t bufsize;
+ uint8_t* buffer;
+ uint8_t* patch_start;
+} CommandParameters;
+
+// Do a source/target load for move/bsdiff/imgdiff in version 3.
+//
+// Parameters are the same as for LoadSrcTgtVersion2, except for 'onehash', which
+// tells the function whether to expect separate source and targe block hashes, or
+// if they are both the same and only one hash should be expected, and
+// 'isunresumable', which receives a non-zero value if block verification fails in
+// a way that the update cannot be resumed anymore.
+//
+// If the function is unable to load the necessary blocks or their contents don't
+// match the hashes, the return value is -1 and the command should be aborted.
+//
+// If the return value is 1, the command has already been completed according to
+// the contents of the target blocks, and should not be performed again.
+//
+// If the return value is 0, source blocks have expected content and the command
+// can be performed.
+
+static int LoadSrcTgtVersion3(CommandParameters* params, RangeSet** tgt, int* src_blocks,
+ int onehash, bool* overlap) {
+ char* srchash = NULL;
+ char* tgthash = NULL;
+ int stash_exists = 0;
+ int rc = -1;
+ uint8_t* tgtbuffer = NULL;
+
+ if (!params|| !tgt || !src_blocks || !overlap) {
+ goto v3out;
+ }
+
+ srchash = strtok_r(NULL, " ", &params->cpos);
+
+ if (srchash == NULL) {
+ fprintf(stderr, "missing source hash\n");
+ goto v3out;
+ }
+
+ if (onehash) {
+ tgthash = srchash;
+ } else {
+ tgthash = strtok_r(NULL, " ", &params->cpos);
+
+ if (tgthash == NULL) {
+ fprintf(stderr, "missing target hash\n");
+ goto v3out;
+ }
+ }
+
+ if (LoadSrcTgtVersion2(&params->cpos, tgt, src_blocks, &params->buffer, &params->bufsize,
+ params->fd, params->stashbase, overlap) == -1) {
+ goto v3out;
+ }
+
+ tgtbuffer = (uint8_t*) malloc((*tgt)->size * BLOCKSIZE);
+
+ if (tgtbuffer == NULL) {
+ fprintf(stderr, "failed to allocate %d bytes\n", (*tgt)->size * BLOCKSIZE);
+ goto v3out;
+ }
+
+ if (ReadBlocks(*tgt, tgtbuffer, params->fd) == -1) {
+ goto v3out;
+ }
+
+ if (VerifyBlocks(tgthash, tgtbuffer, (*tgt)->size, false) == 0) {
+ // Target blocks already have expected content, command should be skipped
+ rc = 1;
+ goto v3out;
+ }
+
+ if (VerifyBlocks(srchash, params->buffer, *src_blocks, true) == 0) {
+ // If source and target blocks overlap, stash the source blocks so we can
+ // resume from possible write errors
+ if (*overlap) {
+ fprintf(stderr, "stashing %d overlapping blocks to %s\n", *src_blocks,
+ srchash);
+
+ if (WriteStash(params->stashbase, srchash, *src_blocks, params->buffer, true,
+ &stash_exists) != 0) {
+ fprintf(stderr, "failed to stash overlapping source blocks\n");
+ goto v3out;
+ }
+
+ // Can be deleted when the write has completed
+ if (!stash_exists) {
+ params->freestash = srchash;
+ }
+ }
+
+ // Source blocks have expected content, command can proceed
+ rc = 0;
+ goto v3out;
+ }
+
+ if (*overlap && LoadStash(params->stashbase, srchash, 1, NULL, &params->buffer,
+ &params->bufsize, true) == 0) {
+ // Overlapping source blocks were previously stashed, command can proceed.
+ // We are recovering from an interrupted command, so we don't know if the
+ // stash can safely be deleted after this command.
+ rc = 0;
+ goto v3out;
+ }
+
+ // Valid source data not available, update cannot be resumed
+ fprintf(stderr, "partition has unexpected contents\n");
+ params->isunresumable = true;
+
+v3out:
+ if (tgtbuffer) {
+ free(tgtbuffer);
+ }
+
+ return rc;
+}
+
+static int PerformCommandMove(CommandParameters* params) {
+ int blocks = 0;
+ bool overlap = false;
+ int rc = -1;
+ int status = 0;
+ RangeSet* tgt = NULL;
+
+ if (!params) {
+ goto pcmout;
+ }
+
+ if (params->version == 1) {
+ status = LoadSrcTgtVersion1(&params->cpos, &tgt, &blocks, &params->buffer,
+ &params->bufsize, params->fd);
+ } else if (params->version == 2) {
+ status = LoadSrcTgtVersion2(&params->cpos, &tgt, &blocks, &params->buffer,
+ &params->bufsize, params->fd, params->stashbase, NULL);
+ } else if (params->version >= 3) {
+ status = LoadSrcTgtVersion3(params, &tgt, &blocks, 1, &overlap);
+ }
+
+ if (status == -1) {
+ fprintf(stderr, "failed to read blocks for move\n");
+ goto pcmout;
+ }
+
+ if (status == 0) {
+ params->foundwrites = 1;
+ } else if (params->foundwrites) {
+ fprintf(stderr, "warning: commands executed out of order [%s]\n", params->cmdname);
+ }
+
+ if (params->canwrite) {
+ if (status == 0) {
+ fprintf(stderr, " moving %d blocks\n", blocks);
+
+ if (WriteBlocks(tgt, params->buffer, params->fd) == -1) {
+ goto pcmout;
+ }
+ } else {
+ fprintf(stderr, "skipping %d already moved blocks\n", blocks);
+ }
+
+ }
+
+ if (params->freestash) {
+ FreeStash(params->stashbase, params->freestash);
+ params->freestash = NULL;
+ }
+
+ params->written += tgt->size;
+ rc = 0;
+
+pcmout:
+ if (tgt) {
+ free(tgt);
+ }
+
+ return rc;
+}
+
+static int PerformCommandStash(CommandParameters* params) {
+ if (!params) {
+ return -1;
+ }
+
+ return SaveStash(params->stashbase, &params->cpos, &params->buffer, &params->bufsize,
+ params->fd, (params->version >= 3));
+}
+
+static int PerformCommandFree(CommandParameters* params) {
+ if (!params) {
+ return -1;
+ }
+
+ if (params->createdstash || params->canwrite) {
+ return FreeStash(params->stashbase, params->cpos);
+ }
+
+ return 0;
+}
+
+static int PerformCommandZero(CommandParameters* params) {
+ char* range = NULL;
+ int rc = -1;
+ RangeSet* tgt = NULL;
+
+ if (!params) {
+ goto pczout;
+ }
+
+ range = strtok_r(NULL, " ", &params->cpos);
+
+ if (range == NULL) {
+ fprintf(stderr, "missing target blocks for zero\n");
+ goto pczout;
+ }
+
+ tgt = parse_range(range);
+
+ fprintf(stderr, " zeroing %d blocks\n", tgt->size);
+
+ allocate(BLOCKSIZE, &params->buffer, &params->bufsize);
+ memset(params->buffer, 0, BLOCKSIZE);
+
+ if (params->canwrite) {
+ for (size_t i = 0; i < tgt->count; ++i) {
+ if (!check_lseek(params->fd, (off64_t) tgt->pos[i * 2] * BLOCKSIZE, SEEK_SET)) {
+ goto pczout;
+ }
+
+ for (size_t j = tgt->pos[i * 2]; j < tgt->pos[i * 2 + 1]; ++j) {
+ if (write_all(params->fd, params->buffer, BLOCKSIZE) == -1) {
+ goto pczout;
+ }
+ }
+ }
+ }
+
+ if (params->cmdname[0] == 'z') {
+ // Update only for the zero command, as the erase command will call
+ // this if DEBUG_ERASE is defined.
+ params->written += tgt->size;
+ }
+
+ rc = 0;
+
+pczout:
+ if (tgt) {
+ free(tgt);
+ }
+
+ return rc;
+}
+
+static int PerformCommandNew(CommandParameters* params) {
+ char* range = NULL;
+ int rc = -1;
+ RangeSet* tgt = NULL;
+ RangeSinkState rss;
+
+ if (!params) {
+ goto pcnout;
+ }
+
+ range = strtok_r(NULL, " ", &params->cpos);
+
+ if (range == NULL) {
+ goto pcnout;
+ }
+
+ tgt = parse_range(range);
+
+ if (params->canwrite) {
+ fprintf(stderr, " writing %d blocks of new data\n", tgt->size);
+
+ rss.fd = params->fd;
+ rss.tgt = tgt;
+ rss.p_block = 0;
+ rss.p_remain = (tgt->pos[1] - tgt->pos[0]) * BLOCKSIZE;
+
+ if (!check_lseek(params->fd, (off64_t) tgt->pos[0] * BLOCKSIZE, SEEK_SET)) {
+ goto pcnout;
+ }
+
+ pthread_mutex_lock(&params->nti.mu);
+ params->nti.rss = &rss;
+ pthread_cond_broadcast(&params->nti.cv);
+
+ while (params->nti.rss) {
+ pthread_cond_wait(&params->nti.cv, &params->nti.mu);
+ }
+
+ pthread_mutex_unlock(&params->nti.mu);
+ }
+
+ params->written += tgt->size;
+ rc = 0;
+
+pcnout:
+ if (tgt) {
+ free(tgt);
+ }
+
+ return rc;
+}
+
+static int PerformCommandDiff(CommandParameters* params) {
+ char* logparams = NULL;
+ char* value = NULL;
+ int blocks = 0;
+ bool overlap = false;
+ int rc = -1;
+ int status = 0;
+ RangeSet* tgt = NULL;
+ RangeSinkState rss;
+ size_t len = 0;
+ size_t offset = 0;
+ Value patch_value;
+
+ if (!params) {
+ goto pcdout;
+ }
+
+ logparams = strdup(params->cpos);
+ value = strtok_r(NULL, " ", &params->cpos);
+
+ if (value == NULL) {
+ fprintf(stderr, "missing patch offset for %s\n", params->cmdname);
+ goto pcdout;
+ }
+
+ offset = strtoul(value, NULL, 0);
+
+ value = strtok_r(NULL, " ", &params->cpos);
+
+ if (value == NULL) {
+ fprintf(stderr, "missing patch length for %s\n", params->cmdname);
+ goto pcdout;
+ }
+
+ len = strtoul(value, NULL, 0);
+
+ if (params->version == 1) {
+ status = LoadSrcTgtVersion1(&params->cpos, &tgt, &blocks, &params->buffer,
+ &params->bufsize, params->fd);
+ } else if (params->version == 2) {
+ status = LoadSrcTgtVersion2(&params->cpos, &tgt, &blocks, &params->buffer,
+ &params->bufsize, params->fd, params->stashbase, NULL);
+ } else if (params->version >= 3) {
+ status = LoadSrcTgtVersion3(params, &tgt, &blocks, 0, &overlap);
+ }
+
+ if (status == -1) {
+ fprintf(stderr, "failed to read blocks for diff\n");
+ goto pcdout;
+ }
+
+ if (status == 0) {
+ params->foundwrites = 1;
+ } else if (params->foundwrites) {
+ fprintf(stderr, "warning: commands executed out of order [%s]\n", params->cmdname);
+ }
+
+ if (params->canwrite) {
+ if (status == 0) {
+ fprintf(stderr, "patching %d blocks to %d\n", blocks, tgt->size);
+
+ patch_value.type = VAL_BLOB;
+ patch_value.size = len;
+ patch_value.data = (char*) (params->patch_start + offset);
+
+ rss.fd = params->fd;
+ rss.tgt = tgt;
+ rss.p_block = 0;
+ rss.p_remain = (tgt->pos[1] - tgt->pos[0]) * BLOCKSIZE;
+
+ if (!check_lseek(params->fd, (off64_t) tgt->pos[0] * BLOCKSIZE, SEEK_SET)) {
+ goto pcdout;
+ }
+
+ if (params->cmdname[0] == 'i') { // imgdiff
+ ApplyImagePatch(params->buffer, blocks * BLOCKSIZE, &patch_value,
+ &RangeSinkWrite, &rss, NULL, NULL);
+ } else {
+ ApplyBSDiffPatch(params->buffer, blocks * BLOCKSIZE, &patch_value,
+ 0, &RangeSinkWrite, &rss, NULL);
+ }
+
+ // We expect the output of the patcher to fill the tgt ranges exactly.
+ if (rss.p_block != tgt->count || rss.p_remain != 0) {
+ fprintf(stderr, "range sink underrun?\n");
+ }
+ } else {
+ fprintf(stderr, "skipping %d blocks already patched to %d [%s]\n",
+ blocks, tgt->size, logparams);
+ }
+ }
+
+ if (params->freestash) {
+ FreeStash(params->stashbase, params->freestash);
+ params->freestash = NULL;
+ }
+
+ params->written += tgt->size;
+ rc = 0;
+
+pcdout:
+ if (logparams) {
+ free(logparams);
+ }
+
+ if (tgt) {
+ free(tgt);
+ }
+
+ return rc;
+}
+
+static int PerformCommandErase(CommandParameters* params) {
+ char* range = NULL;
+ int rc = -1;
+ RangeSet* tgt = NULL;
+ struct stat st;
+ uint64_t blocks[2];
+
+ if (DEBUG_ERASE) {
+ return PerformCommandZero(params);
+ }
+
+ if (!params) {
+ goto pceout;
+ }
+
+ if (fstat(params->fd, &st) == -1) {
+ fprintf(stderr, "failed to fstat device to erase: %s\n", strerror(errno));
+ goto pceout;
+ }
+
+ if (!S_ISBLK(st.st_mode)) {
+ fprintf(stderr, "not a block device; skipping erase\n");
+ goto pceout;
+ }
+
+ range = strtok_r(NULL, " ", &params->cpos);
+
+ if (range == NULL) {
+ fprintf(stderr, "missing target blocks for erase\n");
+ goto pceout;
+ }
+
+ tgt = parse_range(range);
+
+ if (params->canwrite) {
+ fprintf(stderr, " erasing %d blocks\n", tgt->size);
+
+ for (size_t i = 0; i < tgt->count; ++i) {
+ // offset in bytes
+ blocks[0] = tgt->pos[i * 2] * (uint64_t) BLOCKSIZE;
+ // length in bytes
+ blocks[1] = (tgt->pos[i * 2 + 1] - tgt->pos[i * 2]) * (uint64_t) BLOCKSIZE;
+
+ if (ioctl(params->fd, BLKDISCARD, &blocks) == -1) {
+ fprintf(stderr, "BLKDISCARD ioctl failed: %s\n", strerror(errno));
+ goto pceout;
+ }
+ }
+ }
+
+ rc = 0;
+
+pceout:
+ if (tgt) {
+ free(tgt);
+ }
+
+ return rc;
+}
+
+// Definitions for transfer list command functions
+typedef int (*CommandFunction)(CommandParameters*);
+
+typedef struct {
+ const char* name;
+ CommandFunction f;
+} Command;
+
+// CompareCommands and CompareCommandNames are for the hash table
+
+static int CompareCommands(const void* c1, const void* c2) {
+ return strcmp(((const Command*) c1)->name, ((const Command*) c2)->name);
+}
+
+static int CompareCommandNames(const void* c1, const void* c2) {
+ return strcmp(((const Command*) c1)->name, (const char*) c2);
+}
+
+// HashString is used to hash command names for the hash table
+
+static unsigned int HashString(const char *s) {
+ unsigned int hash = 0;
+ if (s) {
+ while (*s) {
+ hash = hash * 33 + *s++;
+ }
+ }
+ return hash;
+}
+
+// args:
+// - block device (or file) to modify in-place
+// - transfer list (blob)
+// - new data stream (filename within package.zip)
+// - patch stream (filename within package.zip, must be uncompressed)
+
+static Value* PerformBlockImageUpdate(const char* name, State* state, int argc, Expr* argv[],
+ const Command* commands, int cmdcount, bool dryrun) {
+
+ char* line = NULL;
+ char* linesave = NULL;
+ char* logcmd = NULL;
+ char* transfer_list = NULL;
+ CommandParameters params;
+ const Command* cmd = NULL;
+ const ZipEntry* new_entry = NULL;
+ const ZipEntry* patch_entry = NULL;
+ FILE* cmd_pipe = NULL;
+ HashTable* cmdht = NULL;
+ int i;
+ int res;
+ int rc = -1;
+ int stash_max_blocks = 0;
+ int total_blocks = 0;
+ pthread_attr_t attr;
+ unsigned int cmdhash;
+ UpdaterInfo* ui = NULL;
+ Value* blockdev_filename = NULL;
+ Value* new_data_fn = NULL;
+ Value* patch_data_fn = NULL;
+ Value* transfer_list_value = NULL;
+ ZipArchive* za = NULL;
+
+ memset(&params, 0, sizeof(params));
+ params.canwrite = !dryrun;
+
+ fprintf(stderr, "performing %s\n", dryrun ? "verification" : "update");
+
+ if (ReadValueArgs(state, argv, 4, &blockdev_filename, &transfer_list_value,
+ &new_data_fn, &patch_data_fn) < 0) {
+ goto pbiudone;
+ }
+
+ if (blockdev_filename->type != VAL_STRING) {
+ ErrorAbort(state, "blockdev_filename argument to %s must be string", name);
+ goto pbiudone;
+ }
+ if (transfer_list_value->type != VAL_BLOB) {
+ ErrorAbort(state, "transfer_list argument to %s must be blob", name);
+ goto pbiudone;
+ }
+ if (new_data_fn->type != VAL_STRING) {
+ ErrorAbort(state, "new_data_fn argument to %s must be string", name);
+ goto pbiudone;
+ }
+ if (patch_data_fn->type != VAL_STRING) {
+ ErrorAbort(state, "patch_data_fn argument to %s must be string", name);
+ goto pbiudone;
+ }
+
+ ui = (UpdaterInfo*) state->cookie;
+
+ if (ui == NULL) {
+ goto pbiudone;
+ }
+
+ cmd_pipe = ui->cmd_pipe;
+ za = ui->package_zip;
+
+ if (cmd_pipe == NULL || za == NULL) {
+ goto pbiudone;
+ }
+
+ patch_entry = mzFindZipEntry(za, patch_data_fn->data);
+
+ if (patch_entry == NULL) {
+ fprintf(stderr, "%s(): no file \"%s\" in package", name, patch_data_fn->data);
+ goto pbiudone;
+ }
+
+ params.patch_start = ui->package_zip_addr + mzGetZipEntryOffset(patch_entry);
+ new_entry = mzFindZipEntry(za, new_data_fn->data);
+
+ if (new_entry == NULL) {
+ fprintf(stderr, "%s(): no file \"%s\" in package", name, new_data_fn->data);
+ goto pbiudone;
+ }
+
+ params.fd = TEMP_FAILURE_RETRY(open(blockdev_filename->data, O_RDWR));
+
+ if (params.fd == -1) {
+ fprintf(stderr, "open \"%s\" failed: %s\n", blockdev_filename->data, strerror(errno));
+ goto pbiudone;
+ }
+
+ if (params.canwrite) {
+ params.nti.za = za;
+ params.nti.entry = new_entry;
+
+ pthread_mutex_init(&params.nti.mu, NULL);
+ pthread_cond_init(&params.nti.cv, NULL);
+ pthread_attr_init(&attr);
+ pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
+
+ int error = pthread_create(&params.thread, &attr, unzip_new_data, &params.nti);
+ if (error != 0) {
+ fprintf(stderr, "pthread_create failed: %s\n", strerror(error));
+ goto pbiudone;
+ }
+ }
+
+ // The data in transfer_list_value is not necessarily null-terminated, so we need
+ // to copy it to a new buffer and add the null that strtok_r will need.
+ transfer_list = reinterpret_cast<char*>(malloc(transfer_list_value->size + 1));
+
+ if (transfer_list == NULL) {
+ fprintf(stderr, "failed to allocate %zd bytes for transfer list\n",
+ transfer_list_value->size + 1);
+ goto pbiudone;
+ }
+
+ memcpy(transfer_list, transfer_list_value->data, transfer_list_value->size);
+ transfer_list[transfer_list_value->size] = '\0';
+
+ // First line in transfer list is the version number
+ line = strtok_r(transfer_list, "\n", &linesave);
+ params.version = strtol(line, NULL, 0);
+
+ if (params.version < 1 || params.version > 3) {
+ fprintf(stderr, "unexpected transfer list version [%s]\n", line);
+ goto pbiudone;
+ }
+
+ fprintf(stderr, "blockimg version is %d\n", params.version);
+
+ // Second line in transfer list is the total number of blocks we expect to write
+ line = strtok_r(NULL, "\n", &linesave);
+ total_blocks = strtol(line, NULL, 0);
+
+ if (total_blocks < 0) {
+ ErrorAbort(state, "unexpected block count [%s]\n", line);
+ goto pbiudone;
+ } else if (total_blocks == 0) {
+ rc = 0;
+ goto pbiudone;
+ }
+
+ if (params.version >= 2) {
+ // Third line is how many stash entries are needed simultaneously
+ line = strtok_r(NULL, "\n", &linesave);
+ fprintf(stderr, "maximum stash entries %s\n", line);
+
+ // Fourth line is the maximum number of blocks that will be stashed simultaneously
+ line = strtok_r(NULL, "\n", &linesave);
+ stash_max_blocks = strtol(line, NULL, 0);
+
+ if (stash_max_blocks < 0) {
+ ErrorAbort(state, "unexpected maximum stash blocks [%s]\n", line);
+ goto pbiudone;
+ }
+
+ if (stash_max_blocks >= 0) {
+ res = CreateStash(state, stash_max_blocks, blockdev_filename->data, params.stashbase);
+
+ if (res == -1) {
+ goto pbiudone;
+ }
+
+ params.createdstash = res;
+ }
+ }
+
+ // Build a hash table of the available commands
+ cmdht = mzHashTableCreate(cmdcount, NULL);
+
+ for (i = 0; i < cmdcount; ++i) {
+ cmdhash = HashString(commands[i].name);
+ mzHashTableLookup(cmdht, cmdhash, (void*) &commands[i], CompareCommands, true);
+ }
+
+ // Subsequent lines are all individual transfer commands
+ for (line = strtok_r(NULL, "\n", &linesave); line;
+ line = strtok_r(NULL, "\n", &linesave)) {
+
+ logcmd = strdup(line);
+ params.cmdname = strtok_r(line, " ", &params.cpos);
+
+ if (params.cmdname == NULL) {
+ fprintf(stderr, "missing command [%s]\n", line);
+ goto pbiudone;
+ }
+
+ cmdhash = HashString(params.cmdname);
+ cmd = (const Command*) mzHashTableLookup(cmdht, cmdhash, params.cmdname,
+ CompareCommandNames, false);
+
+ if (cmd == NULL) {
+ fprintf(stderr, "unexpected command [%s]\n", params.cmdname);
+ goto pbiudone;
+ }
+
+ if (cmd->f != NULL && cmd->f(&params) == -1) {
+ fprintf(stderr, "failed to execute command [%s]\n",
+ logcmd ? logcmd : params.cmdname);
+ goto pbiudone;
+ }
+
+ if (logcmd) {
+ free(logcmd);
+ logcmd = NULL;
+ }
+
+ if (params.canwrite) {
+ if (fsync(params.fd) == -1) {
+ fprintf(stderr, "fsync failed: %s\n", strerror(errno));
+ goto pbiudone;
+ }
+ fprintf(cmd_pipe, "set_progress %.4f\n", (double) params.written / total_blocks);
+ fflush(cmd_pipe);
+ }
+ }
+
+ if (params.canwrite) {
+ pthread_join(params.thread, NULL);
+
+ fprintf(stderr, "wrote %d blocks; expected %d\n", params.written, total_blocks);
+ fprintf(stderr, "max alloc needed was %zu\n", params.bufsize);
+
+ // Delete stash only after successfully completing the update, as it
+ // may contain blocks needed to complete the update later.
+ DeleteStash(params.stashbase);
+ } else {
+ fprintf(stderr, "verified partition contents; update may be resumed\n");
+ }
+
+ rc = 0;
+
+pbiudone:
+ if (params.fd != -1) {
+ if (fsync(params.fd) == -1) {
+ fprintf(stderr, "fsync failed: %s\n", strerror(errno));
+ }
+ close(params.fd);
+ }
+
+ if (logcmd) {
+ free(logcmd);
+ }
+
+ if (cmdht) {
+ mzHashTableFree(cmdht);
+ }
+
+ if (params.buffer) {
+ free(params.buffer);
+ }
+
+ if (transfer_list) {
+ free(transfer_list);
+ }
+
+ if (blockdev_filename) {
+ FreeValue(blockdev_filename);
+ }
+
+ if (transfer_list_value) {
+ FreeValue(transfer_list_value);
+ }
+
+ if (new_data_fn) {
+ FreeValue(new_data_fn);
+ }
+
+ if (patch_data_fn) {
+ FreeValue(patch_data_fn);
+ }
+
+ // Only delete the stash if the update cannot be resumed, or it's
+ // a verification run and we created the stash.
+ if (params.isunresumable || (!params.canwrite && params.createdstash)) {
+ DeleteStash(params.stashbase);
+ }
+
+ return StringValue(rc == 0 ? strdup("t") : strdup(""));
+}
+
+// The transfer list is a text file containing commands to
+// transfer data from one place to another on the target
+// partition. We parse it and execute the commands in order:
+//
+// zero [rangeset]
+// - fill the indicated blocks with zeros
+//
+// new [rangeset]
+// - fill the blocks with data read from the new_data file
+//
+// erase [rangeset]
+// - mark the given blocks as empty
+//
+// move <...>
+// bsdiff <patchstart> <patchlen> <...>
+// imgdiff <patchstart> <patchlen> <...>
+// - read the source blocks, apply a patch (or not in the
+// case of move), write result to target blocks. bsdiff or
+// imgdiff specifies the type of patch; move means no patch
+// at all.
+//
+// The format of <...> differs between versions 1 and 2;
+// see the LoadSrcTgtVersion{1,2}() functions for a
+// description of what's expected.
+//
+// stash <stash_id> <src_range>
+// - (version 2+ only) load the given source range and stash
+// the data in the given slot of the stash table.
+//
+// The creator of the transfer list will guarantee that no block
+// is read (ie, used as the source for a patch or move) after it
+// has been written.
+//
+// In version 2, the creator will guarantee that a given stash is
+// loaded (with a stash command) before it's used in a
+// move/bsdiff/imgdiff command.
+//
+// Within one command the source and target ranges may overlap so
+// in general we need to read the entire source into memory before
+// writing anything to the target blocks.
+//
+// All the patch data is concatenated into one patch_data file in
+// the update package. It must be stored uncompressed because we
+// memory-map it in directly from the archive. (Since patches are
+// already compressed, we lose very little by not compressing
+// their concatenation.)
+//
+// In version 3, commands that read data from the partition (i.e.
+// move/bsdiff/imgdiff/stash) have one or more additional hashes
+// before the range parameters, which are used to check if the
+// command has already been completed and verify the integrity of
+// the source data.
+
+Value* BlockImageVerifyFn(const char* name, State* state, int argc, Expr* argv[]) {
+ // Commands which are not tested are set to NULL to skip them completely
+ const Command commands[] = {
+ { "bsdiff", PerformCommandDiff },
+ { "erase", NULL },
+ { "free", PerformCommandFree },
+ { "imgdiff", PerformCommandDiff },
+ { "move", PerformCommandMove },
+ { "new", NULL },
+ { "stash", PerformCommandStash },
+ { "zero", NULL }
+ };
+
+ // Perform a dry run without writing to test if an update can proceed
+ return PerformBlockImageUpdate(name, state, argc, argv, commands,
+ sizeof(commands) / sizeof(commands[0]), true);
+}
+
+Value* BlockImageUpdateFn(const char* name, State* state, int argc, Expr* argv[]) {
+ const Command commands[] = {
+ { "bsdiff", PerformCommandDiff },
+ { "erase", PerformCommandErase },
+ { "free", PerformCommandFree },
+ { "imgdiff", PerformCommandDiff },
+ { "move", PerformCommandMove },
+ { "new", PerformCommandNew },
+ { "stash", PerformCommandStash },
+ { "zero", PerformCommandZero }
+ };
+
+ return PerformBlockImageUpdate(name, state, argc, argv, commands,
+ sizeof(commands) / sizeof(commands[0]), false);
+}
+
+Value* RangeSha1Fn(const char* name, State* state, int argc, Expr* argv[]) {
+ Value* blockdev_filename;
+ Value* ranges;
+ const uint8_t* digest = NULL;
+ if (ReadValueArgs(state, argv, 2, &blockdev_filename, &ranges) < 0) {
+ return NULL;
+ }
+
+ if (blockdev_filename->type != VAL_STRING) {
+ ErrorAbort(state, "blockdev_filename argument to %s must be string", name);
+ goto done;
+ }
+ if (ranges->type != VAL_STRING) {
+ ErrorAbort(state, "ranges argument to %s must be string", name);
+ goto done;
+ }
+
+ int fd;
+ fd = open(blockdev_filename->data, O_RDWR);
+ if (fd < 0) {
+ ErrorAbort(state, "open \"%s\" failed: %s", blockdev_filename->data, strerror(errno));
+ goto done;
+ }
+
+ RangeSet* rs;
+ rs = parse_range(ranges->data);
+ uint8_t buffer[BLOCKSIZE];
+
+ SHA_CTX ctx;
+ SHA_init(&ctx);
+
+ for (size_t i = 0; i < rs->count; ++i) {
+ if (!check_lseek(fd, (off64_t)rs->pos[i*2] * BLOCKSIZE, SEEK_SET)) {
+ ErrorAbort(state, "failed to seek %s: %s", blockdev_filename->data,
+ strerror(errno));
+ goto done;
+ }
+
+ for (size_t j = rs->pos[i*2]; j < rs->pos[i*2+1]; ++j) {
+ if (read_all(fd, buffer, BLOCKSIZE) == -1) {
+ ErrorAbort(state, "failed to read %s: %s", blockdev_filename->data,
+ strerror(errno));
+ goto done;
+ }
+
+ SHA_update(&ctx, buffer, BLOCKSIZE);
+ }
+ }
+ digest = SHA_final(&ctx);
+ close(fd);
+
+ done:
+ FreeValue(blockdev_filename);
+ FreeValue(ranges);
+ if (digest == NULL) {
+ return StringValue(strdup(""));
+ } else {
+ return StringValue(strdup(print_sha1(digest).c_str()));
+ }
+}
+
+void RegisterBlockImageFunctions() {
+ RegisterFunction("block_image_verify", BlockImageVerifyFn);
+ RegisterFunction("block_image_update", BlockImageUpdateFn);
+ RegisterFunction("range_sha1", RangeSha1Fn);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-21 19:16:39 +0100