diff options
Diffstat (limited to 'applypatch/applypatch.cpp')
| -rw-r--r-- | applypatch/applypatch.cpp | 752 |
1 files changed, 267 insertions, 485 deletions
diff --git a/applypatch/applypatch.cpp b/applypatch/applypatch.cpp index 7645a4005..f9383ddeb 100644 --- a/applypatch/applypatch.cpp +++ b/applypatch/applypatch.cpp @@ -23,261 +23,167 @@ #include <stdlib.h> #include <string.h> #include <sys/stat.h> -#include <sys/statfs.h> #include <sys/types.h> #include <unistd.h> +#include <algorithm> #include <functional> #include <memory> #include <string> #include <utility> #include <vector> +#include <android-base/file.h> #include <android-base/logging.h> #include <android-base/parseint.h> #include <android-base/strings.h> +#include <android-base/unique_fd.h> #include <openssl/sha.h> #include "edify/expr.h" -#include "otafault/ota_io.h" -#include "otautil/cache_location.h" +#include "otautil/paths.h" #include "otautil/print_sha1.h" -static int LoadPartitionContents(const std::string& filename, FileContents* file); -static size_t FileSink(const unsigned char* data, size_t len, int fd); -static int GenerateTarget(const FileContents& source_file, const std::unique_ptr<Value>& patch, - const std::string& target_filename, - const uint8_t target_sha1[SHA_DIGEST_LENGTH], const Value* bonus_data); +using namespace std::string_literals; -// Read a file into memory; store the file contents and associated metadata in *file. -// Return 0 on success. -int LoadFileContents(const char* filename, FileContents* file) { - // A special 'filename' beginning with "EMMC:" means to load the contents of a partition. - if (strncmp(filename, "EMMC:", 5) == 0) { - return LoadPartitionContents(filename, file); - } +static bool GenerateTarget(const Partition& target, const FileContents& source_file, + const Value& patch, const Value* bonus_data); - struct stat sb; - if (stat(filename, &sb) == -1) { - printf("failed to stat \"%s\": %s\n", filename, strerror(errno)); - return -1; +bool LoadFileContents(const std::string& filename, FileContents* file) { + // No longer allow loading contents from eMMC partitions. + if (android::base::StartsWith(filename, "EMMC:")) { + return false; } - std::vector<unsigned char> data(sb.st_size); - unique_file f(ota_fopen(filename, "rb")); - if (!f) { - printf("failed to open \"%s\": %s\n", filename, strerror(errno)); - return -1; + std::string data; + if (!android::base::ReadFileToString(filename, &data)) { + PLOG(ERROR) << "Failed to read \"" << filename << "\""; + return false; } - size_t bytes_read = ota_fread(data.data(), 1, data.size(), f.get()); - if (bytes_read != data.size()) { - printf("short read of \"%s\" (%zu bytes of %zu)\n", filename, bytes_read, data.size()); - return -1; - } - file->data = std::move(data); + file->data = std::vector<unsigned char>(data.begin(), data.end()); SHA1(file->data.data(), file->data.size(), file->sha1); - return 0; + return true; } -// Load the contents of an EMMC partition into the provided -// FileContents. filename should be a string of the form -// "EMMC:<partition_device>:...". The smallest size_n bytes for -// which that prefix of the partition contents has the corresponding -// sha1 hash will be loaded. It is acceptable for a size value to be -// repeated with different sha1s. Will return 0 on success. -// -// This complexity is needed because if an OTA installation is -// interrupted, the partition might contain either the source or the -// target data, which might be of different lengths. We need to know -// the length in order to read from a partition (there is no -// "end-of-file" marker), so the caller must specify the possible -// lengths and the hash of the data, and we'll do the load expecting -// to find one of those hashes. -static int LoadPartitionContents(const std::string& filename, FileContents* file) { - std::vector<std::string> pieces = android::base::Split(filename, ":"); - if (pieces.size() < 4 || pieces.size() % 2 != 0 || pieces[0] != "EMMC") { - printf("LoadPartitionContents called with bad filename \"%s\"\n", filename.c_str()); - return -1; - } - - size_t pair_count = (pieces.size() - 2) / 2; // # of (size, sha1) pairs in filename - std::vector<std::pair<size_t, std::string>> pairs; - for (size_t i = 0; i < pair_count; ++i) { - size_t size; - if (!android::base::ParseUint(pieces[i * 2 + 2], &size) || size == 0) { - printf("LoadPartitionContents called with bad size \"%s\"\n", pieces[i * 2 + 2].c_str()); - return -1; - } - pairs.push_back({ size, pieces[i * 2 + 3] }); +// Reads the contents of a Partition to the given FileContents buffer. +static bool ReadPartitionToBuffer(const Partition& partition, FileContents* out, + bool check_backup) { + uint8_t expected_sha1[SHA_DIGEST_LENGTH]; + if (ParseSha1(partition.hash, expected_sha1) != 0) { + LOG(ERROR) << "Failed to parse target hash \"" << partition.hash << "\""; + return false; } - // Sort the pairs array so that they are in order of increasing size. - std::sort(pairs.begin(), pairs.end()); - - const char* partition = pieces[1].c_str(); - unique_file dev(ota_fopen(partition, "rb")); + android::base::unique_fd dev(open(partition.name.c_str(), O_RDONLY)); if (!dev) { - printf("failed to open emmc partition \"%s\": %s\n", partition, strerror(errno)); - return -1; - } - - SHA_CTX sha_ctx; - SHA1_Init(&sha_ctx); - - // Allocate enough memory to hold the largest size. - std::vector<unsigned char> buffer(pairs[pair_count - 1].first); - unsigned char* buffer_ptr = buffer.data(); - size_t buffer_size = 0; // # bytes read so far - bool found = false; - - for (const auto& pair : pairs) { - size_t current_size = pair.first; - const std::string& current_sha1 = pair.second; - - // Read enough additional bytes to get us up to the next size. (Again, - // we're trying the possibilities in order of increasing size). - size_t next = current_size - buffer_size; - if (next > 0) { - size_t read = ota_fread(buffer_ptr, 1, next, dev.get()); - if (next != read) { - printf("short read (%zu bytes of %zu) for partition \"%s\"\n", read, next, partition); - return -1; + PLOG(ERROR) << "Failed to open eMMC partition \"" << partition << "\""; + } else { + std::vector<unsigned char> buffer(partition.size); + if (!android::base::ReadFully(dev, buffer.data(), buffer.size())) { + PLOG(ERROR) << "Failed to read " << buffer.size() << " bytes of data for partition " + << partition; + } else { + SHA1(buffer.data(), buffer.size(), out->sha1); + if (memcmp(out->sha1, expected_sha1, SHA_DIGEST_LENGTH) == 0) { + out->data = std::move(buffer); + return true; } - SHA1_Update(&sha_ctx, buffer_ptr, read); - buffer_size += read; - buffer_ptr += read; - } - - // Duplicate the SHA context and finalize the duplicate so we can - // check it against this pair's expected hash. - SHA_CTX temp_ctx; - memcpy(&temp_ctx, &sha_ctx, sizeof(SHA_CTX)); - uint8_t sha_so_far[SHA_DIGEST_LENGTH]; - SHA1_Final(sha_so_far, &temp_ctx); - - uint8_t parsed_sha[SHA_DIGEST_LENGTH]; - if (ParseSha1(current_sha1.c_str(), parsed_sha) != 0) { - printf("failed to parse SHA-1 %s in %s\n", current_sha1.c_str(), filename.c_str()); - return -1; - } - - if (memcmp(sha_so_far, parsed_sha, SHA_DIGEST_LENGTH) == 0) { - // We have a match. Stop reading the partition; we'll return the data we've read so far. - printf("partition read matched size %zu SHA-1 %s\n", current_size, current_sha1.c_str()); - found = true; - break; } } - if (!found) { - // Ran off the end of the list of (size, sha1) pairs without finding a match. - printf("contents of partition \"%s\" didn't match %s\n", partition, filename.c_str()); - return -1; + if (!check_backup) { + LOG(ERROR) << "Partition contents don't have the expected checksum"; + return false; } - SHA1_Final(file->sha1, &sha_ctx); - - buffer.resize(buffer_size); - file->data = std::move(buffer); + if (LoadFileContents(Paths::Get().cache_temp_source(), out) && + memcmp(out->sha1, expected_sha1, SHA_DIGEST_LENGTH) == 0) { + return true; + } - return 0; + LOG(ERROR) << "Both of partition contents and backup don't have the expected checksum"; + return false; } -// Save the contents of the given FileContents object under the given -// filename. Return 0 on success. -int SaveFileContents(const char* filename, const FileContents* file) { - unique_fd fd(ota_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_SYNC, S_IRUSR | S_IWUSR)); +bool SaveFileContents(const std::string& filename, const FileContents* file) { + android::base::unique_fd fd( + open(filename.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_SYNC, S_IRUSR | S_IWUSR)); if (fd == -1) { - printf("failed to open \"%s\" for write: %s\n", filename, strerror(errno)); - return -1; + PLOG(ERROR) << "Failed to open \"" << filename << "\" for write"; + return false; } - size_t bytes_written = FileSink(file->data.data(), file->data.size(), fd); - if (bytes_written != file->data.size()) { - printf("short write of \"%s\" (%zd bytes of %zu): %s\n", filename, bytes_written, - file->data.size(), strerror(errno)); - return -1; + if (!android::base::WriteFully(fd, file->data.data(), file->data.size())) { + PLOG(ERROR) << "Failed to write " << file->data.size() << " bytes of data to " << filename; + return false; } - if (ota_fsync(fd) != 0) { - printf("fsync of \"%s\" failed: %s\n", filename, strerror(errno)); - return -1; - } - if (ota_close(fd) != 0) { - printf("close of \"%s\" failed: %s\n", filename, strerror(errno)); - return -1; - } - - return 0; -} -// Write a memory buffer to 'target' partition, a string of the form -// "EMMC:<partition_device>[:...]". The target name -// might contain multiple colons, but WriteToPartition() only uses the first -// two and ignores the rest. Return 0 on success. -int WriteToPartition(const unsigned char* data, size_t len, const std::string& target) { - std::vector<std::string> pieces = android::base::Split(target, ":"); - if (pieces.size() < 2 || pieces[0] != "EMMC") { - printf("WriteToPartition called with bad target (%s)\n", target.c_str()); - return -1; + if (fsync(fd) != 0) { + PLOG(ERROR) << "Failed to fsync \"" << filename << "\""; + return false; } - const char* partition = pieces[1].c_str(); - unique_fd fd(ota_open(partition, O_RDWR)); - if (fd == -1) { - printf("failed to open %s: %s\n", partition, strerror(errno)); - return -1; + if (close(fd.release()) != 0) { + PLOG(ERROR) << "Failed to close \"" << filename << "\""; + return false; } + return true; +} + +// Writes a memory buffer to 'target' Partition. +static bool WriteBufferToPartition(const FileContents& file_contents, const Partition& partition) { + const unsigned char* data = file_contents.data.data(); + size_t len = file_contents.data.size(); size_t start = 0; bool success = false; for (size_t attempt = 0; attempt < 2; ++attempt) { + android::base::unique_fd fd(open(partition.name.c_str(), O_RDWR)); + if (fd == -1) { + PLOG(ERROR) << "Failed to open \"" << partition << "\""; + return false; + } + if (TEMP_FAILURE_RETRY(lseek(fd, start, SEEK_SET)) == -1) { - printf("failed seek on %s: %s\n", partition, strerror(errno)); - return -1; + PLOG(ERROR) << "Failed to seek to " << start << " on \"" << partition << "\""; + return false; } - while (start < len) { - size_t to_write = len - start; - if (to_write > 1 << 20) to_write = 1 << 20; - - ssize_t written = TEMP_FAILURE_RETRY(ota_write(fd, data + start, to_write)); - if (written == -1) { - printf("failed write writing to %s: %s\n", partition, strerror(errno)); - return -1; - } - start += written; + + if (!android::base::WriteFully(fd, data + start, len - start)) { + PLOG(ERROR) << "Failed to write " << len - start << " bytes to \"" << partition << "\""; + return false; } - if (ota_fsync(fd) != 0) { - printf("failed to sync to %s: %s\n", partition, strerror(errno)); - return -1; + if (fsync(fd) != 0) { + PLOG(ERROR) << "Failed to sync \"" << partition << "\""; + return false; } - if (ota_close(fd) != 0) { - printf("failed to close %s: %s\n", partition, strerror(errno)); - return -1; + if (close(fd.release()) != 0) { + PLOG(ERROR) << "Failed to close \"" << partition << "\""; + return false; } - fd.reset(ota_open(partition, O_RDONLY)); + fd.reset(open(partition.name.c_str(), O_RDONLY)); if (fd == -1) { - printf("failed to reopen %s for verify: %s\n", partition, strerror(errno)); - return -1; + PLOG(ERROR) << "Failed to reopen \"" << partition << "\" for verification"; + return false; } // Drop caches so our subsequent verification read won't just be reading the cache. sync(); - unique_fd dc(ota_open("/proc/sys/vm/drop_caches", O_WRONLY)); - if (TEMP_FAILURE_RETRY(ota_write(dc, "3\n", 2)) == -1) { - printf("write to /proc/sys/vm/drop_caches failed: %s\n", strerror(errno)); + std::string drop_cache = "/proc/sys/vm/drop_caches"; + if (!android::base::WriteStringToFile("3\n", drop_cache)) { + PLOG(ERROR) << "Failed to write to " << drop_cache; } else { - printf(" caches dropped\n"); + LOG(INFO) << " caches dropped"; } - ota_close(dc); sleep(1); // Verify. if (TEMP_FAILURE_RETRY(lseek(fd, 0, SEEK_SET)) == -1) { - printf("failed to seek back to beginning of %s: %s\n", partition, strerror(errno)); - return -1; + PLOG(ERROR) << "Failed to seek to 0 on " << partition; + return false; } unsigned char buffer[4096]; @@ -288,386 +194,262 @@ int WriteToPartition(const unsigned char* data, size_t len, const std::string& t to_read = sizeof(buffer); } - size_t so_far = 0; - while (so_far < to_read) { - ssize_t read_count = TEMP_FAILURE_RETRY(ota_read(fd, buffer + so_far, to_read - so_far)); - if (read_count == -1) { - printf("verify read error %s at %zu: %s\n", partition, p, strerror(errno)); - return -1; - } else if (read_count == 0) { - printf("verify read reached unexpected EOF, %s at %zu\n", partition, p); - return -1; - } - if (static_cast<size_t>(read_count) < to_read) { - printf("short verify read %s at %zu: %zd %zu\n", partition, p, read_count, to_read); - } - so_far += read_count; + if (!android::base::ReadFully(fd, buffer, to_read)) { + PLOG(ERROR) << "Failed to verify-read " << partition << " at " << p; + return false; } if (memcmp(buffer, data + p, to_read) != 0) { - printf("verification failed starting at %zu\n", p); + LOG(ERROR) << "Verification failed starting at " << p; start = p; break; } } if (start == len) { - printf("verification read succeeded (attempt %zu)\n", attempt + 1); + LOG(INFO) << "Verification read succeeded (attempt " << attempt + 1 << ")"; success = true; break; } - if (ota_close(fd) != 0) { - printf("failed to close %s: %s\n", partition, strerror(errno)); - return -1; - } - - fd.reset(ota_open(partition, O_RDWR)); - if (fd == -1) { - printf("failed to reopen %s for retry write && verify: %s\n", partition, strerror(errno)); - return -1; + if (close(fd.release()) != 0) { + PLOG(ERROR) << "Failed to close " << partition; + return false; } } if (!success) { - printf("failed to verify after all attempts\n"); - return -1; + LOG(ERROR) << "Failed to verify after all attempts"; + return false; } - if (ota_close(fd) == -1) { - printf("error closing %s: %s\n", partition, strerror(errno)); - return -1; - } sync(); - return 0; -} - -// Take a string 'str' of 40 hex digits and parse it into the 20 -// byte array 'digest'. 'str' may contain only the digest or be of -// the form "<digest>:<anything>". Return 0 on success, -1 on any -// error. -int ParseSha1(const char* str, uint8_t* digest) { - const char* ps = str; - uint8_t* pd = digest; - for (int i = 0; i < SHA_DIGEST_LENGTH * 2; ++i, ++ps) { - int digit; - if (*ps >= '0' && *ps <= '9') { - digit = *ps - '0'; - } else if (*ps >= 'a' && *ps <= 'f') { - digit = *ps - 'a' + 10; - } else if (*ps >= 'A' && *ps <= 'F') { - digit = *ps - 'A' + 10; - } else { - return -1; - } - if (i % 2 == 0) { - *pd = digit << 4; - } else { - *pd |= digit; - ++pd; - } - } - if (*ps != '\0') return -1; - return 0; -} - -// Search an array of sha1 strings for one matching the given sha1. -// Return the index of the match on success, or -1 if no match is -// found. -static int FindMatchingPatch(uint8_t* sha1, const std::vector<std::string>& patch_sha1_str) { - for (size_t i = 0; i < patch_sha1_str.size(); ++i) { - uint8_t patch_sha1[SHA_DIGEST_LENGTH]; - if (ParseSha1(patch_sha1_str[i].c_str(), patch_sha1) == 0 && - memcmp(patch_sha1, sha1, SHA_DIGEST_LENGTH) == 0) { - return i; - } - } - return -1; + return true; } -// Returns 0 if the contents of the file (argv[2]) or the cached file -// match any of the sha1's on the command line (argv[3:]). Returns -// nonzero otherwise. -int applypatch_check(const char* filename, const std::vector<std::string>& patch_sha1_str) { - FileContents file; - - // It's okay to specify no sha1s; the check will pass if the - // LoadFileContents is successful. (Useful for reading - // partitions, where the filename encodes the sha1s; no need to - // check them twice.) - if (LoadFileContents(filename, &file) != 0 || - (!patch_sha1_str.empty() && FindMatchingPatch(file.sha1, patch_sha1_str) < 0)) { - printf("file \"%s\" doesn't have any of expected sha1 sums; checking cache\n", filename); - - // If the source file is missing or corrupted, it might be because we were killed in the middle - // of patching it. A copy of it should have been made in cache_temp_source. If that file - // exists and matches the sha1 we're looking for, the check still passes. - if (LoadFileContents(CacheLocation::location().cache_temp_source().c_str(), &file) != 0) { - printf("failed to load cache file\n"); - return 1; +int ParseSha1(const std::string& str, uint8_t* digest) { + const char* ps = str.c_str(); + uint8_t* pd = digest; + for (int i = 0; i < SHA_DIGEST_LENGTH * 2; ++i, ++ps) { + int digit; + if (*ps >= '0' && *ps <= '9') { + digit = *ps - '0'; + } else if (*ps >= 'a' && *ps <= 'f') { + digit = *ps - 'a' + 10; + } else if (*ps >= 'A' && *ps <= 'F') { + digit = *ps - 'A' + 10; + } else { + return -1; } - - if (FindMatchingPatch(file.sha1, patch_sha1_str) < 0) { - printf("cache bits don't match any sha1 for \"%s\"\n", filename); - return 1; + if (i % 2 == 0) { + *pd = digit << 4; + } else { + *pd |= digit; + ++pd; } } + if (*ps != '\0') return -1; return 0; } -int ShowLicenses() { - ShowBSDiffLicense(); - return 0; -} - -static size_t FileSink(const unsigned char* data, size_t len, int fd) { - size_t done = 0; - while (done < len) { - ssize_t wrote = TEMP_FAILURE_RETRY(ota_write(fd, data + done, len - done)); - if (wrote == -1) { - printf("error writing %zd bytes: %s\n", (len - done), strerror(errno)); - return done; - } - done += wrote; - } - return done; +bool PatchPartitionCheck(const Partition& target, const Partition& source) { + FileContents target_file; + FileContents source_file; + return (ReadPartitionToBuffer(target, &target_file, false) || + ReadPartitionToBuffer(source, &source_file, true)); } -// Return the amount of free space (in bytes) on the filesystem -// containing filename. filename must exist. Return -1 on error. -size_t FreeSpaceForFile(const char* filename) { - struct statfs sf; - if (statfs(filename, &sf) != 0) { - printf("failed to statfs %s: %s\n", filename, strerror(errno)); - return -1; - } - return sf.f_bsize * sf.f_bavail; +int ShowLicenses() { + ShowBSDiffLicense(); + return 0; } -int CacheSizeCheck(size_t bytes) { - if (MakeFreeSpaceOnCache(bytes) < 0) { - printf("unable to make %zu bytes available on /cache\n", bytes); - return 1; - } - return 0; -} +bool PatchPartition(const Partition& target, const Partition& source, const Value& patch, + const Value* bonus) { + LOG(INFO) << "Patching " << target.name; -// This function applies binary patches to EMMC target files in a way that is safe (the original -// file is not touched until we have the desired replacement for it) and idempotent (it's okay to -// run this program multiple times). -// -// - If the SHA-1 hash of <target_filename> is <target_sha1_string>, does nothing and exits -// successfully. -// -// - Otherwise, if the SHA-1 hash of <source_filename> is one of the entries in <patch_sha1_str>, -// the corresponding patch from <patch_data> (which must be a VAL_BLOB) is applied to produce a -// new file (the type of patch is automatically detected from the blob data). If that new file -// has SHA-1 hash <target_sha1_str>, moves it to replace <target_filename>, and exits -// successfully. Note that if <source_filename> and <target_filename> are not the same, -// <source_filename> is NOT deleted on success. <target_filename> may be the string "-" to mean -// "the same as <source_filename>". -// -// - Otherwise, or if any error is encountered, exits with non-zero status. -// -// <source_filename> must refer to an EMMC partition to read the source data. See the comments for -// the LoadPartitionContents() function above for the format of such a filename. <target_size> has -// become obsolete since we have dropped the support for patching non-EMMC targets (EMMC targets -// have the size embedded in the filename). -int applypatch(const char* source_filename, const char* target_filename, - const char* target_sha1_str, size_t /* target_size */, - const std::vector<std::string>& patch_sha1_str, - const std::vector<std::unique_ptr<Value>>& patch_data, const Value* bonus_data) { - printf("patch %s: ", source_filename); - - if (target_filename[0] == '-' && target_filename[1] == '\0') { - target_filename = source_filename; - } - - if (strncmp(target_filename, "EMMC:", 5) != 0) { - printf("Supporting patching EMMC targets only.\n"); - return 1; - } - - uint8_t target_sha1[SHA_DIGEST_LENGTH]; - if (ParseSha1(target_sha1_str, target_sha1) != 0) { - printf("failed to parse tgt-sha1 \"%s\"\n", target_sha1_str); - return 1; - } - - // We try to load the target file into the source_file object. - FileContents source_file; - if (LoadFileContents(target_filename, &source_file) == 0) { - if (memcmp(source_file.sha1, target_sha1, SHA_DIGEST_LENGTH) == 0) { - // The early-exit case: the patch was already applied, this file has the desired hash, nothing - // for us to do. - printf("already %s\n", short_sha1(target_sha1).c_str()); - return 0; - } + // We try to load and check against the target hash first. + FileContents target_file; + if (ReadPartitionToBuffer(target, &target_file, false)) { + // The early-exit case: the patch was already applied, this file has the desired hash, nothing + // for us to do. + LOG(INFO) << " already " << target.hash.substr(0, 8); + return true; } - if (source_file.data.empty() || - (target_filename != source_filename && strcmp(target_filename, source_filename) != 0)) { - // Need to load the source file: either we failed to load the target file, or we did but it's - // different from the expected. - source_file.data.clear(); - LoadFileContents(source_filename, &source_file); + FileContents source_file; + if (ReadPartitionToBuffer(source, &source_file, true)) { + return GenerateTarget(target, source_file, patch, bonus); } - if (!source_file.data.empty()) { - int to_use = FindMatchingPatch(source_file.sha1, patch_sha1_str); - if (to_use != -1) { - return GenerateTarget(source_file, patch_data[to_use], target_filename, target_sha1, - bonus_data); - } - } + LOG(ERROR) << "Failed to find any match"; + return false; +} - printf("source file is bad; trying copy\n"); +bool FlashPartition(const Partition& partition, const std::string& source_filename) { + LOG(INFO) << "Flashing " << partition; - FileContents copy_file; - if (LoadFileContents(CacheLocation::location().cache_temp_source().c_str(), ©_file) < 0) { - printf("failed to read copy file\n"); - return 1; + // We try to load and check against the target hash first. + FileContents target_file; + if (ReadPartitionToBuffer(partition, &target_file, false)) { + // The early-exit case: the patch was already applied, this file has the desired hash, nothing + // for us to do. + LOG(INFO) << " already " << partition.hash.substr(0, 8); + return true; } - int to_use = FindMatchingPatch(copy_file.sha1, patch_sha1_str); - if (to_use == -1) { - printf("copy file doesn't match source SHA-1s either\n"); - return 1; + FileContents source_file; + if (!LoadFileContents(source_filename, &source_file)) { + LOG(ERROR) << "Failed to load source file"; + return false; } - return GenerateTarget(copy_file, patch_data[to_use], target_filename, target_sha1, bonus_data); -} - -/* - * This function flashes a given image to the target partition. It verifies - * the target cheksum first, and will return if target has the desired hash. - * It checks the checksum of the given source image before flashing, and - * verifies the target partition afterwards. The function is idempotent. - * Returns zero on success. - */ -int applypatch_flash(const char* source_filename, const char* target_filename, - const char* target_sha1_str, size_t target_size) { - printf("flash %s: ", target_filename); - - uint8_t target_sha1[SHA_DIGEST_LENGTH]; - if (ParseSha1(target_sha1_str, target_sha1) != 0) { - printf("failed to parse tgt-sha1 \"%s\"\n", target_sha1_str); - return 1; + uint8_t expected_sha1[SHA_DIGEST_LENGTH]; + if (ParseSha1(partition.hash, expected_sha1) != 0) { + LOG(ERROR) << "Failed to parse source hash \"" << partition.hash << "\""; + return false; } - std::string target_str(target_filename); - std::vector<std::string> pieces = android::base::Split(target_str, ":"); - if (pieces.size() != 2 || pieces[0] != "EMMC") { - printf("invalid target name \"%s\"", target_filename); - return 1; + if (memcmp(source_file.sha1, expected_sha1, SHA_DIGEST_LENGTH) != 0) { + // The source doesn't have desired checksum. + LOG(ERROR) << "source \"" << source_filename << "\" doesn't have expected SHA-1 sum"; + LOG(ERROR) << "expected: " << partition.hash.substr(0, 8) + << ", found: " << short_sha1(source_file.sha1); + return false; } - - // Load the target into the source_file object to see if already applied. - pieces.push_back(std::to_string(target_size)); - pieces.push_back(target_sha1_str); - std::string fullname = android::base::Join(pieces, ':'); - FileContents source_file; - if (LoadPartitionContents(fullname, &source_file) == 0 && - memcmp(source_file.sha1, target_sha1, SHA_DIGEST_LENGTH) == 0) { - // The early-exit case: the image was already applied, this partition - // has the desired hash, nothing for us to do. - printf("already %s\n", short_sha1(target_sha1).c_str()); - return 0; - } - - if (LoadFileContents(source_filename, &source_file) == 0) { - if (memcmp(source_file.sha1, target_sha1, SHA_DIGEST_LENGTH) != 0) { - // The source doesn't have desired checksum. - printf("source \"%s\" doesn't have expected sha1 sum\n", source_filename); - printf("expected: %s, found: %s\n", short_sha1(target_sha1).c_str(), - short_sha1(source_file.sha1).c_str()); - return 1; - } + if (!WriteBufferToPartition(source_file, partition)) { + LOG(ERROR) << "Failed to write to " << partition; + return false; } + return true; +} - if (WriteToPartition(source_file.data.data(), target_size, target_filename) != 0) { - printf("write of copied data to %s failed\n", target_filename); - return 1; +static bool GenerateTarget(const Partition& target, const FileContents& source_file, + const Value& patch, const Value* bonus_data) { + uint8_t expected_sha1[SHA_DIGEST_LENGTH]; + if (ParseSha1(target.hash, expected_sha1) != 0) { + LOG(ERROR) << "Failed to parse target hash \"" << target.hash << "\""; + return false; } - return 0; -} -static int GenerateTarget(const FileContents& source_file, const std::unique_ptr<Value>& patch, - const std::string& target_filename, - const uint8_t target_sha1[SHA_DIGEST_LENGTH], const Value* bonus_data) { - if (patch->type != VAL_BLOB) { - printf("patch is not a blob\n"); - return 1; + if (patch.type != Value::Type::BLOB) { + LOG(ERROR) << "patch is not a blob"; + return false; } - const char* header = &patch->data[0]; - size_t header_bytes_read = patch->data.size(); + const char* header = patch.data.data(); + size_t header_bytes_read = patch.data.size(); bool use_bsdiff = false; if (header_bytes_read >= 8 && memcmp(header, "BSDIFF40", 8) == 0) { use_bsdiff = true; } else if (header_bytes_read >= 8 && memcmp(header, "IMGDIFF2", 8) == 0) { use_bsdiff = false; } else { - printf("Unknown patch file format\n"); - return 1; + LOG(ERROR) << "Unknown patch file format"; + return false; } - CHECK(android::base::StartsWith(target_filename, "EMMC:")); - - // We still write the original source to cache, in case the partition write is interrupted. - if (MakeFreeSpaceOnCache(source_file.data.size()) < 0) { - printf("not enough free space on /cache\n"); - return 1; + // We write the original source to cache, in case the partition write is interrupted. + if (!CheckAndFreeSpaceOnCache(source_file.data.size())) { + LOG(ERROR) << "Not enough free space on /cache"; + return false; } - if (SaveFileContents(CacheLocation::location().cache_temp_source().c_str(), &source_file) < 0) { - printf("failed to back up source file\n"); - return 1; + if (!SaveFileContents(Paths::Get().cache_temp_source(), &source_file)) { + LOG(ERROR) << "Failed to back up source file"; + return false; } // We store the decoded output in memory. - std::string memory_sink_str; // Don't need to reserve space. - SinkFn sink = [&memory_sink_str](const unsigned char* data, size_t len) { - memory_sink_str.append(reinterpret_cast<const char*>(data), len); - return len; - }; - + FileContents patched; SHA_CTX ctx; SHA1_Init(&ctx); + SinkFn sink = [&patched, &ctx](const unsigned char* data, size_t len) { + SHA1_Update(&ctx, data, len); + patched.data.insert(patched.data.end(), data, data + len); + return len; + }; int result; if (use_bsdiff) { - result = - ApplyBSDiffPatch(source_file.data.data(), source_file.data.size(), *patch, 0, sink, &ctx); + result = ApplyBSDiffPatch(source_file.data.data(), source_file.data.size(), patch, 0, sink); } else { - result = ApplyImagePatch(source_file.data.data(), source_file.data.size(), *patch, sink, &ctx, - bonus_data); + result = + ApplyImagePatch(source_file.data.data(), source_file.data.size(), patch, sink, bonus_data); } if (result != 0) { - printf("applying patch failed\n"); - return 1; + LOG(ERROR) << "Failed to apply the patch: " << result; + return false; } - uint8_t current_target_sha1[SHA_DIGEST_LENGTH]; - SHA1_Final(current_target_sha1, &ctx); - if (memcmp(current_target_sha1, target_sha1, SHA_DIGEST_LENGTH) != 0) { - printf("patch did not produce expected sha1\n"); - return 1; - } else { - printf("now %s\n", short_sha1(target_sha1).c_str()); + SHA1_Final(patched.sha1, &ctx); + if (memcmp(patched.sha1, expected_sha1, SHA_DIGEST_LENGTH) != 0) { + LOG(ERROR) << "Patching did not produce the expected SHA-1 of " << short_sha1(expected_sha1); + + LOG(ERROR) << "target size " << patched.data.size() << " SHA-1 " << short_sha1(patched.sha1); + LOG(ERROR) << "source size " << source_file.data.size() << " SHA-1 " + << short_sha1(source_file.sha1); + + uint8_t patch_digest[SHA_DIGEST_LENGTH]; + SHA1(reinterpret_cast<const uint8_t*>(patch.data.data()), patch.data.size(), patch_digest); + LOG(ERROR) << "patch size " << patch.data.size() << " SHA-1 " << short_sha1(patch_digest); + + if (bonus_data != nullptr) { + uint8_t bonus_digest[SHA_DIGEST_LENGTH]; + SHA1(reinterpret_cast<const uint8_t*>(bonus_data->data.data()), bonus_data->data.size(), + bonus_digest); + LOG(ERROR) << "bonus size " << bonus_data->data.size() << " SHA-1 " + << short_sha1(bonus_digest); + } + + return false; } + LOG(INFO) << " now " << short_sha1(expected_sha1); + // Write back the temp file to the partition. - if (WriteToPartition(reinterpret_cast<const unsigned char*>(memory_sink_str.c_str()), - memory_sink_str.size(), target_filename) != 0) { - printf("write of patched data to %s failed\n", target_filename.c_str()); - return 1; + if (!WriteBufferToPartition(patched, target)) { + LOG(ERROR) << "Failed to write patched data to " << target.name; + return false; } // Delete the backup copy of the source. - unlink(CacheLocation::location().cache_temp_source().c_str()); + unlink(Paths::Get().cache_temp_source().c_str()); // Success! - return 0; + return true; +} + +bool CheckPartition(const Partition& partition) { + FileContents target_file; + return ReadPartitionToBuffer(partition, &target_file, false); +} + +Partition Partition::Parse(const std::string& input_str, std::string* err) { + std::vector<std::string> pieces = android::base::Split(input_str, ":"); + if (pieces.size() != 4 || pieces[0] != "EMMC") { + *err = "Invalid number of tokens or non-eMMC target"; + return {}; + } + + size_t size; + if (!android::base::ParseUint(pieces[2], &size) || size == 0) { + *err = "Failed to parse \"" + pieces[2] + "\" as byte count"; + return {}; + } + + return Partition(pieces[1], size, pieces[3]); +} + +std::string Partition::ToString() const { + if (*this) { + return "EMMC:"s + name + ":" + std::to_string(size) + ":" + hash; + } + return "<invalid-partition>"; +} + +std::ostream& operator<<(std::ostream& os, const Partition& partition) { + os << partition.ToString(); + return os; } |