From ba9a42aa7e10686de186636fe9fecbf8c4cc7c19 Mon Sep 17 00:00:00 2001 From: Tao Bao Date: Tue, 23 Jun 2015 23:23:33 -0700 Subject: recovery: Switch applypatch/ and updater/ to cpp. Mostly trivial changes to make cpp compiler happy. Change-Id: I69bd1d96fcccf506007f6144faf37e11cfba1270 --- applypatch/applypatch.c | 1048 ----------------------------------------------- 1 file changed, 1048 deletions(-) delete mode 100644 applypatch/applypatch.c (limited to 'applypatch/applypatch.c') diff --git a/applypatch/applypatch.c b/applypatch/applypatch.c deleted file mode 100644 index 2358d4292..000000000 --- a/applypatch/applypatch.c +++ /dev/null @@ -1,1048 +0,0 @@ -/* - * Copyright (C) 2008 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "mincrypt/sha.h" -#include "applypatch.h" -#include "mtdutils/mtdutils.h" -#include "edify/expr.h" - -static int LoadPartitionContents(const char* filename, FileContents* file); -static ssize_t FileSink(const unsigned char* data, ssize_t len, void* token); -static int GenerateTarget(FileContents* source_file, - const Value* source_patch_value, - FileContents* copy_file, - const Value* copy_patch_value, - const char* source_filename, - const char* target_filename, - const uint8_t target_sha1[SHA_DIGEST_SIZE], - size_t target_size, - const Value* bonus_data); - -static int mtd_partitions_scanned = 0; - -// 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) { - file->data = NULL; - - // A special 'filename' beginning with "MTD:" or "EMMC:" means to - // load the contents of a partition. - if (strncmp(filename, "MTD:", 4) == 0 || - strncmp(filename, "EMMC:", 5) == 0) { - return LoadPartitionContents(filename, file); - } - - if (stat(filename, &file->st) != 0) { - printf("failed to stat \"%s\": %s\n", filename, strerror(errno)); - return -1; - } - - file->size = file->st.st_size; - file->data = malloc(file->size); - - FILE* f = fopen(filename, "rb"); - if (f == NULL) { - printf("failed to open \"%s\": %s\n", filename, strerror(errno)); - free(file->data); - file->data = NULL; - return -1; - } - - ssize_t bytes_read = fread(file->data, 1, file->size, f); - if (bytes_read != file->size) { - printf("short read of \"%s\" (%ld bytes of %ld)\n", - filename, (long)bytes_read, (long)file->size); - free(file->data); - file->data = NULL; - return -1; - } - fclose(f); - - SHA_hash(file->data, file->size, file->sha1); - return 0; -} - -static size_t* size_array; -// comparison function for qsort()ing an int array of indexes into -// size_array[]. -static int compare_size_indices(const void* a, const void* b) { - int aa = *(int*)a; - int bb = *(int*)b; - if (size_array[aa] < size_array[bb]) { - return -1; - } else if (size_array[aa] > size_array[bb]) { - return 1; - } else { - return 0; - } -} - -// Load the contents of an MTD or EMMC partition into the provided -// FileContents. filename should be a string of the form -// "MTD::::::..." (or -// "EMMC::..."). 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. -enum PartitionType { MTD, EMMC }; - -static int LoadPartitionContents(const char* filename, FileContents* file) { - char* copy = strdup(filename); - const char* magic = strtok(copy, ":"); - - enum PartitionType type; - - if (strcmp(magic, "MTD") == 0) { - type = MTD; - } else if (strcmp(magic, "EMMC") == 0) { - type = EMMC; - } else { - printf("LoadPartitionContents called with bad filename (%s)\n", - filename); - return -1; - } - const char* partition = strtok(NULL, ":"); - - int i; - int colons = 0; - for (i = 0; filename[i] != '\0'; ++i) { - if (filename[i] == ':') { - ++colons; - } - } - if (colons < 3 || colons%2 == 0) { - printf("LoadPartitionContents called with bad filename (%s)\n", - filename); - } - - int pairs = (colons-1)/2; // # of (size,sha1) pairs in filename - int* index = malloc(pairs * sizeof(int)); - size_t* size = malloc(pairs * sizeof(size_t)); - char** sha1sum = malloc(pairs * sizeof(char*)); - - for (i = 0; i < pairs; ++i) { - const char* size_str = strtok(NULL, ":"); - size[i] = strtol(size_str, NULL, 10); - if (size[i] == 0) { - printf("LoadPartitionContents called with bad size (%s)\n", filename); - return -1; - } - sha1sum[i] = strtok(NULL, ":"); - index[i] = i; - } - - // sort the index[] array so it indexes the pairs in order of - // increasing size. - size_array = size; - qsort(index, pairs, sizeof(int), compare_size_indices); - - MtdReadContext* ctx = NULL; - FILE* dev = NULL; - - switch (type) { - case MTD: - if (!mtd_partitions_scanned) { - mtd_scan_partitions(); - mtd_partitions_scanned = 1; - } - - const MtdPartition* mtd = mtd_find_partition_by_name(partition); - if (mtd == NULL) { - printf("mtd partition \"%s\" not found (loading %s)\n", - partition, filename); - return -1; - } - - ctx = mtd_read_partition(mtd); - if (ctx == NULL) { - printf("failed to initialize read of mtd partition \"%s\"\n", - partition); - return -1; - } - break; - - case EMMC: - dev = fopen(partition, "rb"); - if (dev == NULL) { - printf("failed to open emmc partition \"%s\": %s\n", - partition, strerror(errno)); - return -1; - } - } - - SHA_CTX sha_ctx; - SHA_init(&sha_ctx); - uint8_t parsed_sha[SHA_DIGEST_SIZE]; - - // allocate enough memory to hold the largest size. - file->data = malloc(size[index[pairs-1]]); - char* p = (char*)file->data; - file->size = 0; // # bytes read so far - - for (i = 0; i < pairs; ++i) { - // 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 = size[index[i]] - file->size; - size_t read = 0; - if (next > 0) { - switch (type) { - case MTD: - read = mtd_read_data(ctx, p, next); - break; - - case EMMC: - read = fread(p, 1, next, dev); - break; - } - if (next != read) { - printf("short read (%zu bytes of %zu) for partition \"%s\"\n", - read, next, partition); - free(file->data); - file->data = NULL; - return -1; - } - SHA_update(&sha_ctx, p, read); - file->size += 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)); - const uint8_t* sha_so_far = SHA_final(&temp_ctx); - - if (ParseSha1(sha1sum[index[i]], parsed_sha) != 0) { - printf("failed to parse sha1 %s in %s\n", - sha1sum[index[i]], filename); - free(file->data); - file->data = NULL; - return -1; - } - - if (memcmp(sha_so_far, parsed_sha, SHA_DIGEST_SIZE) == 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 %s\n", - size[index[i]], sha1sum[index[i]]); - break; - } - - p += read; - } - - switch (type) { - case MTD: - mtd_read_close(ctx); - break; - - case EMMC: - fclose(dev); - break; - } - - - if (i == pairs) { - // 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); - free(file->data); - file->data = NULL; - return -1; - } - - const uint8_t* sha_final = SHA_final(&sha_ctx); - for (i = 0; i < SHA_DIGEST_SIZE; ++i) { - file->sha1[i] = sha_final[i]; - } - - // Fake some stat() info. - file->st.st_mode = 0644; - file->st.st_uid = 0; - file->st.st_gid = 0; - - free(copy); - free(index); - free(size); - free(sha1sum); - - return 0; -} - - -// Save the contents of the given FileContents object under the given -// filename. Return 0 on success. -int SaveFileContents(const char* filename, const FileContents* file) { - int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_SYNC, S_IRUSR | S_IWUSR); - if (fd < 0) { - printf("failed to open \"%s\" for write: %s\n", - filename, strerror(errno)); - return -1; - } - - ssize_t bytes_written = FileSink(file->data, file->size, &fd); - if (bytes_written != file->size) { - printf("short write of \"%s\" (%ld bytes of %ld) (%s)\n", - filename, (long)bytes_written, (long)file->size, - strerror(errno)); - close(fd); - return -1; - } - if (fsync(fd) != 0) { - printf("fsync of \"%s\" failed: %s\n", filename, strerror(errno)); - return -1; - } - if (close(fd) != 0) { - printf("close of \"%s\" failed: %s\n", filename, strerror(errno)); - return -1; - } - - if (chmod(filename, file->st.st_mode) != 0) { - printf("chmod of \"%s\" failed: %s\n", filename, strerror(errno)); - return -1; - } - if (chown(filename, file->st.st_uid, file->st.st_gid) != 0) { - printf("chown of \"%s\" failed: %s\n", filename, strerror(errno)); - return -1; - } - - return 0; -} - -// Write a memory buffer to 'target' partition, a string of the form -// "MTD:[:...]" or "EMMC::". Return 0 on -// success. -int WriteToPartition(unsigned char* data, size_t len, - const char* target) { - char* copy = strdup(target); - const char* magic = strtok(copy, ":"); - - enum PartitionType type; - if (strcmp(magic, "MTD") == 0) { - type = MTD; - } else if (strcmp(magic, "EMMC") == 0) { - type = EMMC; - } else { - printf("WriteToPartition called with bad target (%s)\n", target); - return -1; - } - const char* partition = strtok(NULL, ":"); - - if (partition == NULL) { - printf("bad partition target name \"%s\"\n", target); - return -1; - } - - switch (type) { - case MTD: - if (!mtd_partitions_scanned) { - mtd_scan_partitions(); - mtd_partitions_scanned = 1; - } - - const MtdPartition* mtd = mtd_find_partition_by_name(partition); - if (mtd == NULL) { - printf("mtd partition \"%s\" not found for writing\n", - partition); - return -1; - } - - MtdWriteContext* ctx = mtd_write_partition(mtd); - if (ctx == NULL) { - printf("failed to init mtd partition \"%s\" for writing\n", - partition); - return -1; - } - - size_t written = mtd_write_data(ctx, (char*)data, len); - if (written != len) { - printf("only wrote %zu of %zu bytes to MTD %s\n", - written, len, partition); - mtd_write_close(ctx); - return -1; - } - - if (mtd_erase_blocks(ctx, -1) < 0) { - printf("error finishing mtd write of %s\n", partition); - mtd_write_close(ctx); - return -1; - } - - if (mtd_write_close(ctx)) { - printf("error closing mtd write of %s\n", partition); - return -1; - } - break; - - case EMMC: - { - size_t start = 0; - int success = 0; - int fd = open(partition, O_RDWR | O_SYNC); - if (fd < 0) { - printf("failed to open %s: %s\n", partition, strerror(errno)); - return -1; - } - int attempt; - - for (attempt = 0; attempt < 2; ++attempt) { - if (TEMP_FAILURE_RETRY(lseek(fd, start, SEEK_SET)) == -1) { - printf("failed seek on %s: %s\n", - partition, strerror(errno)); - return -1; - } - while (start < len) { - size_t to_write = len - start; - if (to_write > 1<<20) to_write = 1<<20; - - ssize_t written = TEMP_FAILURE_RETRY(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 (fsync(fd) != 0) { - printf("failed to sync to %s (%s)\n", - partition, strerror(errno)); - return -1; - } - if (close(fd) != 0) { - printf("failed to close %s (%s)\n", - partition, strerror(errno)); - return -1; - } - fd = open(partition, O_RDONLY); - if (fd < 0) { - printf("failed to reopen %s for verify (%s)\n", - partition, strerror(errno)); - return -1; - } - - // drop caches so our subsequent verification read - // won't just be reading the cache. - sync(); - int dc = open("/proc/sys/vm/drop_caches", O_WRONLY); - if (TEMP_FAILURE_RETRY(write(dc, "3\n", 2)) == -1) { - printf("write to /proc/sys/vm/drop_caches failed: %s\n", strerror(errno)); - } else { - printf(" caches dropped\n"); - } - 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; - } - unsigned char buffer[4096]; - start = len; - size_t p; - for (p = 0; p < len; p += sizeof(buffer)) { - size_t to_read = len - p; - if (to_read > sizeof(buffer)) to_read = sizeof(buffer); - - size_t so_far = 0; - while (so_far < to_read) { - ssize_t read_count = - TEMP_FAILURE_RETRY(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; - } - if ((size_t)read_count < to_read) { - printf("short verify read %s at %zu: %zd %zu %s\n", - partition, p, read_count, to_read, strerror(errno)); - } - so_far += read_count; - } - - if (memcmp(buffer, data+p, to_read)) { - printf("verification failed starting at %zu\n", p); - start = p; - break; - } - } - - if (start == len) { - printf("verification read succeeded (attempt %d)\n", attempt+1); - success = true; - break; - } - } - - if (!success) { - printf("failed to verify after all attempts\n"); - return -1; - } - - if (close(fd) != 0) { - printf("error closing %s (%s)\n", partition, strerror(errno)); - return -1; - } - sync(); - break; - } - } - - free(copy); - 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 ":". Return 0 on success, -1 on any -// error. -int ParseSha1(const char* str, uint8_t* digest) { - int i; - const char* ps = str; - uint8_t* pd = digest; - for (i = 0; i < SHA_DIGEST_SIZE * 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. -int FindMatchingPatch(uint8_t* sha1, char* const * const patch_sha1_str, - int num_patches) { - int i; - uint8_t patch_sha1[SHA_DIGEST_SIZE]; - for (i = 0; i < num_patches; ++i) { - if (ParseSha1(patch_sha1_str[i], patch_sha1) == 0 && - memcmp(patch_sha1, sha1, SHA_DIGEST_SIZE) == 0) { - return i; - } - } - return -1; -} - -// 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, - int num_patches, char** const patch_sha1_str) { - FileContents file; - file.data = NULL; - - // 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 || - (num_patches > 0 && - FindMatchingPatch(file.sha1, patch_sha1_str, num_patches) < 0)) { - printf("file \"%s\" doesn't have any of expected " - "sha1 sums; checking cache\n", filename); - - free(file.data); - file.data = NULL; - - // 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(CACHE_TEMP_SOURCE, &file) != 0) { - printf("failed to load cache file\n"); - return 1; - } - - if (FindMatchingPatch(file.sha1, patch_sha1_str, num_patches) < 0) { - printf("cache bits don't match any sha1 for \"%s\"\n", filename); - free(file.data); - return 1; - } - } - - free(file.data); - return 0; -} - -int ShowLicenses() { - ShowBSDiffLicense(); - return 0; -} - -ssize_t FileSink(const unsigned char* data, ssize_t len, void* token) { - int fd = *(int *)token; - ssize_t done = 0; - ssize_t wrote; - while (done < (ssize_t) len) { - wrote = TEMP_FAILURE_RETRY(write(fd, data+done, len-done)); - if (wrote == -1) { - printf("error writing %d bytes: %s\n", (int)(len-done), strerror(errno)); - return done; - } - done += wrote; - } - return done; -} - -typedef struct { - unsigned char* buffer; - ssize_t size; - ssize_t pos; -} MemorySinkInfo; - -ssize_t MemorySink(const unsigned char* data, ssize_t len, void* token) { - MemorySinkInfo* msi = (MemorySinkInfo*)token; - if (msi->size - msi->pos < len) { - return -1; - } - memcpy(msi->buffer + msi->pos, data, len); - msi->pos += len; - return len; -} - -// 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 CacheSizeCheck(size_t bytes) { - if (MakeFreeSpaceOnCache(bytes) < 0) { - printf("unable to make %ld bytes available on /cache\n", (long)bytes); - return 1; - } else { - return 0; - } -} - -static void print_short_sha1(const uint8_t sha1[SHA_DIGEST_SIZE]) { - int i; - const char* hex = "0123456789abcdef"; - for (i = 0; i < 4; ++i) { - putchar(hex[(sha1[i]>>4) & 0xf]); - putchar(hex[sha1[i] & 0xf]); - } -} - -// This function applies binary patches to 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 sha1 hash of is , -// does nothing and exits successfully. -// -// - otherwise, if the sha1 hash of is one of the -// entries in , the corresponding patch from -// (which must be a VAL_BLOB) is applied to produce a -// new file (the type of patch is automatically detected from the -// blob daat). If that new file has sha1 hash , -// moves it to replace , and exits successfully. -// Note that if and are not the -// same, is NOT deleted on success. -// may be the string "-" to mean "the same as -// source_filename". -// -// - otherwise, or if any error is encountered, exits with non-zero -// status. -// -// may refer to a partition to read the source data. -// See the comments for the LoadPartition Contents() function above -// for the format of such a filename. - -int applypatch(const char* source_filename, - const char* target_filename, - const char* target_sha1_str, - size_t target_size, - int num_patches, - char** const patch_sha1_str, - Value** patch_data, - Value* bonus_data) { - printf("patch %s: ", source_filename); - - if (target_filename[0] == '-' && - target_filename[1] == '\0') { - target_filename = source_filename; - } - - uint8_t target_sha1[SHA_DIGEST_SIZE]; - if (ParseSha1(target_sha1_str, target_sha1) != 0) { - printf("failed to parse tgt-sha1 \"%s\"\n", target_sha1_str); - return 1; - } - - FileContents copy_file; - FileContents source_file; - copy_file.data = NULL; - source_file.data = NULL; - const Value* source_patch_value = NULL; - const Value* copy_patch_value = NULL; - - // We try to load the target file into the source_file object. - if (LoadFileContents(target_filename, &source_file) == 0) { - if (memcmp(source_file.sha1, target_sha1, SHA_DIGEST_SIZE) == 0) { - // The early-exit case: the patch was already applied, this file - // has the desired hash, nothing for us to do. - printf("already "); - print_short_sha1(target_sha1); - putchar('\n'); - free(source_file.data); - return 0; - } - } - - if (source_file.data == NULL || - (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 source file. - free(source_file.data); - source_file.data = NULL; - LoadFileContents(source_filename, &source_file); - } - - if (source_file.data != NULL) { - int to_use = FindMatchingPatch(source_file.sha1, - patch_sha1_str, num_patches); - if (to_use >= 0) { - source_patch_value = patch_data[to_use]; - } - } - - if (source_patch_value == NULL) { - free(source_file.data); - source_file.data = NULL; - printf("source file is bad; trying copy\n"); - - if (LoadFileContents(CACHE_TEMP_SOURCE, ©_file) < 0) { - // fail. - printf("failed to read copy file\n"); - return 1; - } - - int to_use = FindMatchingPatch(copy_file.sha1, - patch_sha1_str, num_patches); - if (to_use >= 0) { - copy_patch_value = patch_data[to_use]; - } - - if (copy_patch_value == NULL) { - // fail. - printf("copy file doesn't match source SHA-1s either\n"); - free(copy_file.data); - return 1; - } - } - - int result = GenerateTarget(&source_file, source_patch_value, - ©_file, copy_patch_value, - source_filename, target_filename, - target_sha1, target_size, bonus_data); - free(source_file.data); - free(copy_file.data); - - return result; -} - -static int GenerateTarget(FileContents* source_file, - const Value* source_patch_value, - FileContents* copy_file, - const Value* copy_patch_value, - const char* source_filename, - const char* target_filename, - const uint8_t target_sha1[SHA_DIGEST_SIZE], - size_t target_size, - const Value* bonus_data) { - int retry = 1; - SHA_CTX ctx; - int output; - MemorySinkInfo msi; - FileContents* source_to_use; - char* outname; - int made_copy = 0; - - // assume that target_filename (eg "/system/app/Foo.apk") is located - // on the same filesystem as its top-level directory ("/system"). - // We need something that exists for calling statfs(). - char target_fs[strlen(target_filename)+1]; - char* slash = strchr(target_filename+1, '/'); - if (slash != NULL) { - int count = slash - target_filename; - strncpy(target_fs, target_filename, count); - target_fs[count] = '\0'; - } else { - strcpy(target_fs, target_filename); - } - - do { - // Is there enough room in the target filesystem to hold the patched - // file? - - if (strncmp(target_filename, "MTD:", 4) == 0 || - strncmp(target_filename, "EMMC:", 5) == 0) { - // If the target is a partition, we're actually going to - // write the output to /tmp and then copy it to the - // partition. statfs() always returns 0 blocks free for - // /tmp, so instead we'll just assume that /tmp has enough - // space to hold the file. - - // We still write the original source to cache, in case - // the partition write is interrupted. - if (MakeFreeSpaceOnCache(source_file->size) < 0) { - printf("not enough free space on /cache\n"); - return 1; - } - if (SaveFileContents(CACHE_TEMP_SOURCE, source_file) < 0) { - printf("failed to back up source file\n"); - return 1; - } - made_copy = 1; - retry = 0; - } else { - int enough_space = 0; - if (retry > 0) { - size_t free_space = FreeSpaceForFile(target_fs); - enough_space = - (free_space > (256 << 10)) && // 256k (two-block) minimum - (free_space > (target_size * 3 / 2)); // 50% margin of error - if (!enough_space) { - printf("target %ld bytes; free space %ld bytes; retry %d; enough %d\n", - (long)target_size, (long)free_space, retry, enough_space); - } - } - - if (!enough_space) { - retry = 0; - } - - if (!enough_space && source_patch_value != NULL) { - // Using the original source, but not enough free space. First - // copy the source file to cache, then delete it from the original - // location. - - if (strncmp(source_filename, "MTD:", 4) == 0 || - strncmp(source_filename, "EMMC:", 5) == 0) { - // It's impossible to free space on the target filesystem by - // deleting the source if the source is a partition. If - // we're ever in a state where we need to do this, fail. - printf("not enough free space for target but source " - "is partition\n"); - return 1; - } - - if (MakeFreeSpaceOnCache(source_file->size) < 0) { - printf("not enough free space on /cache\n"); - return 1; - } - - if (SaveFileContents(CACHE_TEMP_SOURCE, source_file) < 0) { - printf("failed to back up source file\n"); - return 1; - } - made_copy = 1; - unlink(source_filename); - - size_t free_space = FreeSpaceForFile(target_fs); - printf("(now %ld bytes free for target) ", (long)free_space); - } - } - - const Value* patch; - if (source_patch_value != NULL) { - source_to_use = source_file; - patch = source_patch_value; - } else { - source_to_use = copy_file; - patch = copy_patch_value; - } - - if (patch->type != VAL_BLOB) { - printf("patch is not a blob\n"); - return 1; - } - - SinkFn sink = NULL; - void* token = NULL; - output = -1; - outname = NULL; - if (strncmp(target_filename, "MTD:", 4) == 0 || - strncmp(target_filename, "EMMC:", 5) == 0) { - // We store the decoded output in memory. - msi.buffer = malloc(target_size); - if (msi.buffer == NULL) { - printf("failed to alloc %ld bytes for output\n", - (long)target_size); - return 1; - } - msi.pos = 0; - msi.size = target_size; - sink = MemorySink; - token = &msi; - } else { - // We write the decoded output to ".patch". - outname = (char*)malloc(strlen(target_filename) + 10); - strcpy(outname, target_filename); - strcat(outname, ".patch"); - - output = open(outname, O_WRONLY | O_CREAT | O_TRUNC | O_SYNC, - S_IRUSR | S_IWUSR); - if (output < 0) { - printf("failed to open output file %s: %s\n", - outname, strerror(errno)); - return 1; - } - sink = FileSink; - token = &output; - } - - char* header = patch->data; - ssize_t header_bytes_read = patch->size; - - SHA_init(&ctx); - - int result; - - if (header_bytes_read >= 8 && - memcmp(header, "BSDIFF40", 8) == 0) { - result = ApplyBSDiffPatch(source_to_use->data, source_to_use->size, - patch, 0, sink, token, &ctx); - } else if (header_bytes_read >= 8 && - memcmp(header, "IMGDIFF2", 8) == 0) { - result = ApplyImagePatch(source_to_use->data, source_to_use->size, - patch, sink, token, &ctx, bonus_data); - } else { - printf("Unknown patch file format\n"); - return 1; - } - - if (output >= 0) { - if (fsync(output) != 0) { - printf("failed to fsync file \"%s\" (%s)\n", outname, strerror(errno)); - result = 1; - } - if (close(output) != 0) { - printf("failed to close file \"%s\" (%s)\n", outname, strerror(errno)); - result = 1; - } - } - - if (result != 0) { - if (retry == 0) { - printf("applying patch failed\n"); - return result != 0; - } else { - printf("applying patch failed; retrying\n"); - } - if (outname != NULL) { - unlink(outname); - } - } else { - // succeeded; no need to retry - break; - } - } while (retry-- > 0); - - const uint8_t* current_target_sha1 = SHA_final(&ctx); - if (memcmp(current_target_sha1, target_sha1, SHA_DIGEST_SIZE) != 0) { - printf("patch did not produce expected sha1\n"); - return 1; - } else { - printf("now "); - print_short_sha1(target_sha1); - putchar('\n'); - } - - if (output < 0) { - // Copy the temp file to the partition. - if (WriteToPartition(msi.buffer, msi.pos, target_filename) != 0) { - printf("write of patched data to %s failed\n", target_filename); - return 1; - } - free(msi.buffer); - } else { - // Give the .patch file the same owner, group, and mode of the - // original source file. - if (chmod(outname, source_to_use->st.st_mode) != 0) { - printf("chmod of \"%s\" failed: %s\n", outname, strerror(errno)); - return 1; - } - if (chown(outname, source_to_use->st.st_uid, - source_to_use->st.st_gid) != 0) { - printf("chown of \"%s\" failed: %s\n", outname, strerror(errno)); - return 1; - } - - // Finally, rename the .patch file to replace the target file. - if (rename(outname, target_filename) != 0) { - printf("rename of .patch to \"%s\" failed: %s\n", - target_filename, strerror(errno)); - return 1; - } - } - - // If this run of applypatch created the copy, and we're here, we - // can delete it. - if (made_copy) unlink(CACHE_TEMP_SOURCE); - - // Success! - return 0; -} -- cgit v1.2.3