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relocate applypatch; add type system and new functions to edify

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- Move applypatch to this package (from build).

- Add a rudimentary type system to edify:  instead of just returning a
  char*, functions now return a Value*, which is a struct that can
  carry different types of value (currently just STRING and BLOB).
  Convert all functions to this new scheme.

- Change the one-argument form of package_extract_file to return a
  Value of the new BLOB type.

- Add read_file() to load a local file and return a blob, and
  sha1_check() to test a blob (or string) against a set of possible
  sha1s.  read_file() uses the file-loading code from applypatch so it
  can read MTD partitions as well.

This is the start of better integration between applypatch and the
rest of edify.

b/2361316 - VZW Issue PP628: Continuous reset to Droid logo:
            framework-res.apk update failed (CR LIBtt59130)

Change-Id: Ibd038074749a4d515de1f115c498c6c589ee91e5
This commit is contained in:
Doug Zongker 2010-02-17 16:11:44 -08:00
parent 21854ccdb2
commit 512536a54a
22 changed files with 4239 additions and 112 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Android.mk
View File

@ -65,6 +65,7 @@ include $(commands_recovery_local_path)/mtdutils/Android.mk
include $(commands_recovery_local_path)/tools/Android.mk
include $(commands_recovery_local_path)/edify/Android.mk
include $(commands_recovery_local_path)/updater/Android.mk
include $(commands_recovery_local_path)/applypatch/Android.mk
commands_recovery_local_path :=
endif # TARGET_ARCH == arm

59
applypatch/Android.mk Normal file
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@ -0,0 +1,59 @@
# 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.
ifneq ($(TARGET_SIMULATOR),true)
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := applypatch.c bspatch.c freecache.c imgpatch.c utils.c
LOCAL_MODULE := libapplypatch
LOCAL_MODULE_TAGS := eng
LOCAL_C_INCLUDES += external/bzip2 external/zlib bootable/recovery
LOCAL_STATIC_LIBRARIES += libmtdutils libmincrypt libbz libz
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := main.c
LOCAL_MODULE := applypatch
LOCAL_STATIC_LIBRARIES += libapplypatch libmtdutils libmincrypt libbz
LOCAL_SHARED_LIBRARIES += libz libcutils libstdc++ libc
include $(BUILD_EXECUTABLE)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := main.c
LOCAL_MODULE := applypatch_static
LOCAL_FORCE_STATIC_EXECUTABLE := true
LOCAL_MODULE_TAGS := eng
LOCAL_STATIC_LIBRARIES += libapplypatch libmtdutils libmincrypt libbz
LOCAL_STATIC_LIBRARIES += libz libcutils libstdc++ libc
include $(BUILD_EXECUTABLE)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := imgdiff.c utils.c bsdiff.c
LOCAL_MODULE := imgdiff
LOCAL_FORCE_STATIC_EXECUTABLE := true
LOCAL_MODULE_TAGS := eng
LOCAL_C_INCLUDES += external/zlib external/bzip2
LOCAL_STATIC_LIBRARIES += libz libbz
include $(BUILD_HOST_EXECUTABLE)
endif # !TARGET_SIMULATOR

900
applypatch/applypatch.c Normal file
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@ -0,0 +1,900 @@
/*
* 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 <errno.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include "mincrypt/sha.h"
#include "applypatch.h"
#include "mtdutils/mtdutils.h"
int SaveFileContents(const char* filename, FileContents file);
int LoadMTDContents(const char* filename, FileContents* file);
int ParseSha1(const char* str, uint8_t* digest);
ssize_t FileSink(unsigned char* data, ssize_t len, void* token);
static int mtd_partitions_scanned = 0;
// Read a file into memory; store it and its associated metadata in
// *file. Return 0 on success.
int LoadFileContents(const char* filename, FileContents* file) {
file->data = NULL;
// A special 'filename' beginning with "MTD:" means to load the
// contents of an MTD partition.
if (strncmp(filename, "MTD:", 4) == 0) {
return LoadMTDContents(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;
}
size_t bytes_read = fread(file->data, 1, file->size, f);
if (bytes_read != file->size) {
printf("short read of \"%s\" (%d bytes of %d)\n",
filename, bytes_read, file->size);
free(file->data);
file->data = NULL;
return -1;
}
fclose(f);
SHA(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;
}
}
void FreeFileContents(FileContents* file) {
if (file) free(file->data);
free(file);
}
// Load the contents of an MTD partition into the provided
// FileContents. filename should be a string of the form
// "MTD:<partition_name>:<size_1>:<sha1_1>:<size_2>:<sha1_2>:...".
// The smallest size_n bytes for which that prefix of the mtd 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 MTD (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.
int LoadMTDContents(const char* filename, FileContents* file) {
char* copy = strdup(filename);
const char* magic = strtok(copy, ":");
if (strcmp(magic, "MTD") != 0) {
printf("LoadMTDContents 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("LoadMTDContents 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("LoadMTDContents 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);
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;
}
MtdReadContext* ctx = mtd_read_partition(mtd);
if (ctx == NULL) {
printf("failed to initialize read of mtd partition \"%s\"\n",
partition);
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) {
read = mtd_read_data(ctx, p, next);
if (next != read) {
printf("short read (%d bytes of %d) 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("mtd read matched size %d sha %s\n",
size[index[i]], sha1sum[index[i]]);
break;
}
p += read;
}
mtd_read_close(ctx);
if (i == pairs) {
// Ran off the end of the list of (size,sha1) pairs without
// finding a match.
printf("contents of MTD 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, FileContents file) {
int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC);
if (fd < 0) {
printf("failed to open \"%s\" for write: %s\n",
filename, strerror(errno));
return -1;
}
size_t bytes_written = FileSink(file.data, file.size, &fd);
if (bytes_written != file.size) {
printf("short write of \"%s\" (%d bytes of %d) (%s)\n",
filename, bytes_written, file.size, strerror(errno));
close(fd);
return -1;
}
fsync(fd);
close(fd);
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_mtd partition, a string of the form
// "MTD:<partition>[:...]". Return 0 on success.
int WriteToMTDPartition(unsigned char* data, size_t len,
const char* target_mtd) {
char* partition = strchr(target_mtd, ':');
if (partition == NULL) {
printf("bad MTD target name \"%s\"\n", target_mtd);
return -1;
}
++partition;
// Trim off anything after a colon, eg "MTD:boot:blah:blah:blah...".
// We want just the partition name "boot".
partition = strdup(partition);
char* end = strchr(partition, ':');
if (end != NULL)
*end = '\0';
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 %d of %d 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;
}
free(partition);
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) {
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' && *ps != ':') return -1;
return 0;
}
// Parse arguments (which should be of the form "<sha1>" or
// "<sha1>:<filename>" into the array *patches, returning the number
// of Patch objects in *num_patches. Return 0 on success.
int ParseShaArgs(int argc, char** argv, Patch** patches, int* num_patches) {
*num_patches = argc;
*patches = malloc(*num_patches * sizeof(Patch));
int i;
for (i = 0; i < *num_patches; ++i) {
if (ParseSha1(argv[i], (*patches)[i].sha1) != 0) {
printf("failed to parse sha1 \"%s\"\n", argv[i]);
return -1;
}
if (argv[i][SHA_DIGEST_SIZE*2] == '\0') {
(*patches)[i].patch_filename = NULL;
} else if (argv[i][SHA_DIGEST_SIZE*2] == ':') {
(*patches)[i].patch_filename = argv[i] + (SHA_DIGEST_SIZE*2+1);
} else {
printf("failed to parse filename \"%s\"\n", argv[i]);
return -1;
}
}
return 0;
}
// Search an array of Patch objects for one matching the given sha1.
// Return the Patch object on success, or NULL if no match is found.
const Patch* FindMatchingPatch(uint8_t* sha1, Patch* patches, int num_patches) {
int i;
for (i = 0; i < num_patches; ++i) {
if (memcmp(patches[i].sha1, sha1, SHA_DIGEST_SIZE) == 0) {
return patches+i;
}
}
return NULL;
}
// 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 CheckMode(int argc, char** argv) {
if (argc < 3) {
printf("no filename given\n");
return 2;
}
int num_patches;
Patch* patches;
if (ParseShaArgs(argc-3, argv+3, &patches, &num_patches) != 0) { return 1; }
FileContents file;
file.data = NULL;
// It's okay to specify no sha1s; the check will pass if the
// LoadFileContents is successful. (Useful for reading MTD
// partitions, where the filename encodes the sha1s; no need to
// check them twice.)
if (LoadFileContents(argv[2], &file) != 0 ||
(num_patches > 0 &&
FindMatchingPatch(file.sha1, patches, num_patches) == NULL)) {
printf("file \"%s\" doesn't have any of expected "
"sha1 sums; checking cache\n", argv[2]);
free(file.data);
// 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, patches, num_patches) == NULL) {
printf("cache bits don't match any sha1 for \"%s\"\n",
argv[2]);
return 1;
}
}
free(file.data);
return 0;
}
int ShowLicenses() {
ShowBSDiffLicense();
return 0;
}
ssize_t FileSink(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 = write(fd, data+done, len-done);
if (wrote <= 0) {
printf("error writing %d bytes: %s\n", (int)(len-done), strerror(errno));
return done;
}
done += wrote;
}
printf("wrote %d bytes to output\n", (int)done);
return done;
}
typedef struct {
unsigned char* buffer;
ssize_t size;
ssize_t pos;
} MemorySinkInfo;
ssize_t MemorySink(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_bfree;
}
// This program 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 <tgt-file> is <tgt-sha1>, does nothing and exits
// successfully.
//
// - otherwise, if the sha1 hash of <src-file> is <src-sha1>, applies the
// bsdiff <patch> to <src-file> to produce a new file (the type of patch
// is automatically detected from the file header). If that new
// file has sha1 hash <tgt-sha1>, moves it to replace <tgt-file>, and
// exits successfully. Note that if <src-file> and <tgt-file> are
// not the same, <src-file> is NOT deleted on success. <tgt-file>
// may be the string "-" to mean "the same as src-file".
//
// - otherwise, or if any error is encountered, exits with non-zero
// status.
//
// <src-file> (or <file> in check mode) may refer to an MTD partition
// to read the source data. See the comments for the
// LoadMTDContents() function above for the format of such a filename.
//
//
// As you might guess from the arguments, this function used to be
// main(); it was split out this way so applypatch could be built as a
// static library and linked into other executables as well. In the
// future only the library form will exist; we will not need to build
// this as a standalone executable.
//
// The arguments to this function are just the command-line of the
// standalone executable:
//
// <src-file> <tgt-file> <tgt-sha1> <tgt-size> [<src-sha1>:<patch> ...]
// to apply a patch. Returns 0 on success, 1 on failure.
//
// "-c" <file> [<sha1> ...]
// to check a file's contents against zero or more sha1s. Returns
// 0 if it matches any of them, 1 if it doesn't.
//
// "-s" <bytes>
// returns 0 if enough free space is available on /cache; 1 if it
// does not.
//
// "-l"
// shows open-source license information and returns 0.
//
// This function returns 2 if the arguments are not understood (in the
// standalone executable, this causes the usage message to be
// printed).
//
// TODO: make the interface more sensible for use as a library.
int applypatch(int argc, char** argv) {
if (argc < 2) {
return 2;
}
if (strncmp(argv[1], "-l", 3) == 0) {
return ShowLicenses();
}
if (strncmp(argv[1], "-c", 3) == 0) {
return CheckMode(argc, argv);
}
if (strncmp(argv[1], "-s", 3) == 0) {
if (argc != 3) {
return 2;
}
size_t bytes = strtol(argv[2], NULL, 10);
if (MakeFreeSpaceOnCache(bytes) < 0) {
printf("unable to make %ld bytes available on /cache\n", (long)bytes);
return 1;
} else {
return 0;
}
}
uint8_t target_sha1[SHA_DIGEST_SIZE];
const char* source_filename = argv[1];
const char* target_filename = argv[2];
if (target_filename[0] == '-' &&
target_filename[1] == '\0') {
target_filename = source_filename;
}
printf("\napplying patch to %s\n", source_filename);
if (ParseSha1(argv[3], target_sha1) != 0) {
printf("failed to parse tgt-sha1 \"%s\"\n", argv[3]);
return 1;
}
unsigned long target_size = strtoul(argv[4], NULL, 0);
int num_patches;
Patch* patches;
if (ParseShaArgs(argc-5, argv+5, &patches, &num_patches) < 0) { return 1; }
FileContents copy_file;
FileContents source_file;
const char* source_patch_filename = NULL;
const char* copy_patch_filename = NULL;
int made_copy = 0;
// 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("\"%s\" is already target; no patch needed\n",
target_filename);
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);
LoadFileContents(source_filename, &source_file);
}
if (source_file.data != NULL) {
const Patch* to_use =
FindMatchingPatch(source_file.sha1, patches, num_patches);
if (to_use != NULL) {
source_patch_filename = to_use->patch_filename;
}
}
if (source_patch_filename == NULL) {
free(source_file.data);
printf("source file is bad; trying copy\n");
if (LoadFileContents(CACHE_TEMP_SOURCE, &copy_file) < 0) {
// fail.
printf("failed to read copy file\n");
return 1;
}
const Patch* to_use =
FindMatchingPatch(copy_file.sha1, patches, num_patches);
if (to_use != NULL) {
copy_patch_filename = to_use->patch_filename;
}
if (copy_patch_filename == NULL) {
// fail.
printf("copy file doesn't match source SHA-1s either\n");
return 1;
}
}
int retry = 1;
SHA_CTX ctx;
int output;
MemorySinkInfo msi;
FileContents* source_to_use;
char* outname;
// 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) {
// If the target is an MTD 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 MTD
// 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);
int enough_space =
(free_space > (target_size * 3 / 2)); // 50% margin of error
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_filename != 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) {
// It's impossible to free space on the target filesystem by
// deleting the source if the source is an MTD 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 MTD\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)\n", (long)free_space);
}
}
const char* patch_filename;
if (source_patch_filename != NULL) {
source_to_use = &source_file;
patch_filename = source_patch_filename;
} else {
source_to_use = &copy_file;
patch_filename = copy_patch_filename;
}
SinkFn sink = NULL;
void* token = NULL;
output = -1;
outname = NULL;
if (strncmp(target_filename, "MTD:", 4) == 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 "<tgt-file>.patch".
outname = (char*)malloc(strlen(target_filename) + 10);
strcpy(outname, target_filename);
strcat(outname, ".patch");
output = open(outname, O_WRONLY | O_CREAT | O_TRUNC);
if (output < 0) {
printf("failed to open output file %s: %s\n",
outname, strerror(errno));
return 1;
}
sink = FileSink;
token = &output;
}
#define MAX_HEADER_LENGTH 8
unsigned char header[MAX_HEADER_LENGTH];
FILE* patchf = fopen(patch_filename, "rb");
if (patchf == NULL) {
printf("failed to open patch file %s: %s\n",
patch_filename, strerror(errno));
return 1;
}
int header_bytes_read = fread(header, 1, MAX_HEADER_LENGTH, patchf);
fclose(patchf);
SHA_init(&ctx);
int result;
if (header_bytes_read >= 4 &&
header[0] == 0xd6 && header[1] == 0xc3 &&
header[2] == 0xc4 && header[3] == 0) {
// xdelta3 patches begin "VCD" (with the high bits set) followed
// by a zero byte (the version number).
printf("error: xdelta3 patches no longer supported\n");
return 1;
} else if (header_bytes_read >= 8 &&
memcmp(header, "BSDIFF40", 8) == 0) {
result = ApplyBSDiffPatch(source_to_use->data, source_to_use->size,
patch_filename, 0, sink, token, &ctx);
} else if (header_bytes_read >= 8 &&
memcmp(header, "IMGDIFF", 7) == 0 &&
(header[7] == '1' || header[7] == '2')) {
result = ApplyImagePatch(source_to_use->data, source_to_use->size,
patch_filename, sink, token, &ctx);
} else {
printf("Unknown patch file format\n");
return 1;
}
if (output >= 0) {
fsync(output);
close(output);
}
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;
}
if (output < 0) {
// Copy the temp file to the MTD partition.
if (WriteToMTDPartition(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;
}

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/*
* 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.
*/
#ifndef _APPLYPATCH_H
#define _APPLYPATCH_H
#include <sys/stat.h>
#include "mincrypt/sha.h"
typedef struct _Patch {
uint8_t sha1[SHA_DIGEST_SIZE];
const char* patch_filename;
} Patch;
typedef struct _FileContents {
uint8_t sha1[SHA_DIGEST_SIZE];
unsigned char* data;
ssize_t size;
struct stat st;
} FileContents;
// When there isn't enough room on the target filesystem to hold the
// patched version of the file, we copy the original here and delete
// it to free up space. If the expected source file doesn't exist, or
// is corrupted, we look to see if this file contains the bits we want
// and use it as the source instead.
#define CACHE_TEMP_SOURCE "/cache/saved.file"
typedef ssize_t (*SinkFn)(unsigned char*, ssize_t, void*);
// applypatch.c
size_t FreeSpaceForFile(const char* filename);
int applypatch(int argc, char** argv);
// Read a file into memory; store it and its associated metadata in
// *file. Return 0 on success.
int LoadFileContents(const char* filename, FileContents* file);
void FreeFileContents(FileContents* file);
// bsdiff.c
void ShowBSDiffLicense();
int ApplyBSDiffPatch(const unsigned char* old_data, ssize_t old_size,
const char* patch_filename, ssize_t offset,
SinkFn sink, void* token, SHA_CTX* ctx);
int ApplyBSDiffPatchMem(const unsigned char* old_data, ssize_t old_size,
const char* patch_filename, ssize_t patch_offset,
unsigned char** new_data, ssize_t* new_size);
// imgpatch.c
int ApplyImagePatch(const unsigned char* old_data, ssize_t old_size,
const char* patch_filename,
SinkFn sink, void* token, SHA_CTX* ctx);
// freecache.c
int MakeFreeSpaceOnCache(size_t bytes_needed);
#endif

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#!/bin/bash
#
# A test suite for applypatch. Run in a client where you have done
# envsetup, choosecombo, etc.
#
# DO NOT RUN THIS ON A DEVICE YOU CARE ABOUT. It will mess up your
# system partition.
#
#
# TODO: find some way to get this run regularly along with the rest of
# the tests.
EMULATOR_PORT=5580
DATA_DIR=$ANDROID_BUILD_TOP/build/tools/applypatch/testdata
# This must be the filename that applypatch uses for its copies.
CACHE_TEMP_SOURCE=/cache/saved.file
# Put all binaries and files here. We use /cache because it's a
# temporary filesystem in the emulator; it's created fresh each time
# the emulator starts.
WORK_DIR=/system
# partition that WORK_DIR is located on, without the leading slash
WORK_FS=system
# set to 0 to use a device instead
USE_EMULATOR=1
# ------------------------
tmpdir=$(mktemp -d)
if [ "$USE_EMULATOR" == 1 ]; then
emulator -wipe-data -noaudio -no-window -port $EMULATOR_PORT &
pid_emulator=$!
ADB="adb -s emulator-$EMULATOR_PORT "
else
ADB="adb -d "
fi
echo "waiting to connect to device"
$ADB wait-for-device
echo "device is available"
$ADB remount
# free up enough space on the system partition for the test to run.
$ADB shell rm -r /system/media
# run a command on the device; exit with the exit status of the device
# command.
run_command() {
$ADB shell "$@" \; echo \$? | awk '{if (b) {print a}; a=$0; b=1} END {exit a}'
}
testname() {
echo
echo "$1"...
testname="$1"
}
fail() {
echo
echo FAIL: $testname
echo
[ "$open_pid" == "" ] || kill $open_pid
[ "$pid_emulator" == "" ] || kill $pid_emulator
exit 1
}
sha1() {
sha1sum $1 | awk '{print $1}'
}
free_space() {
run_command df | awk "/$1/ {print gensub(/K/, \"\", \"g\", \$6)}"
}
cleanup() {
# not necessary if we're about to kill the emulator, but nice for
# running on real devices or already-running emulators.
testname "removing test files"
run_command rm $WORK_DIR/bloat.dat
run_command rm $WORK_DIR/old.file
run_command rm $WORK_DIR/patch.bsdiff
run_command rm $WORK_DIR/applypatch
run_command rm $CACHE_TEMP_SOURCE
run_command rm /cache/bloat*.dat
[ "$pid_emulator" == "" ] || kill $pid_emulator
rm -rf $tmpdir
}
cleanup
$ADB push $ANDROID_PRODUCT_OUT/system/bin/applypatch $WORK_DIR/applypatch
BAD1_SHA1=$(printf "%040x" $RANDOM)
BAD2_SHA1=$(printf "%040x" $RANDOM)
OLD_SHA1=$(sha1 $DATA_DIR/old.file)
NEW_SHA1=$(sha1 $DATA_DIR/new.file)
NEW_SIZE=$(stat -c %s $DATA_DIR/new.file)
# --------------- basic execution ----------------------
testname "usage message"
run_command $WORK_DIR/applypatch && fail
testname "display license"
run_command $WORK_DIR/applypatch -l | grep -q -i copyright || fail
# --------------- check mode ----------------------
$ADB push $DATA_DIR/old.file $WORK_DIR
testname "check mode single"
run_command $WORK_DIR/applypatch -c $WORK_DIR/old.file $OLD_SHA1 || fail
testname "check mode multiple"
run_command $WORK_DIR/applypatch -c $WORK_DIR/old.file $BAD1_SHA1 $OLD_SHA1 $BAD2_SHA1|| fail
testname "check mode failure"
run_command $WORK_DIR/applypatch -c $WORK_DIR/old.file $BAD2_SHA1 $BAD1_SHA1 && fail
$ADB push $DATA_DIR/old.file $CACHE_TEMP_SOURCE
# put some junk in the old file
run_command dd if=/dev/urandom of=$WORK_DIR/old.file count=100 bs=1024 || fail
testname "check mode cache (corrupted) single"
run_command $WORK_DIR/applypatch -c $WORK_DIR/old.file $OLD_SHA1 || fail
testname "check mode cache (corrupted) multiple"
run_command $WORK_DIR/applypatch -c $WORK_DIR/old.file $BAD1_SHA1 $OLD_SHA1 $BAD2_SHA1|| fail
testname "check mode cache (corrupted) failure"
run_command $WORK_DIR/applypatch -c $WORK_DIR/old.file $BAD2_SHA1 $BAD1_SHA1 && fail
# remove the old file entirely
run_command rm $WORK_DIR/old.file
testname "check mode cache (missing) single"
run_command $WORK_DIR/applypatch -c $WORK_DIR/old.file $OLD_SHA1 || fail
testname "check mode cache (missing) multiple"
run_command $WORK_DIR/applypatch -c $WORK_DIR/old.file $BAD1_SHA1 $OLD_SHA1 $BAD2_SHA1|| fail
testname "check mode cache (missing) failure"
run_command $WORK_DIR/applypatch -c $WORK_DIR/old.file $BAD2_SHA1 $BAD1_SHA1 && fail
# --------------- apply patch ----------------------
$ADB push $DATA_DIR/old.file $WORK_DIR
$ADB push $DATA_DIR/patch.bsdiff $WORK_DIR
# Check that the partition has enough space to apply the patch without
# copying. If it doesn't, we'll be testing the low-space condition
# when we intend to test the not-low-space condition.
testname "apply patches (with enough space)"
free_kb=$(free_space $WORK_FS)
echo "${free_kb}kb free on /$WORK_FS."
if (( free_kb * 1024 < NEW_SIZE * 3 / 2 )); then
echo "Not enough space on /$WORK_FS to patch test file."
echo
echo "This doesn't mean that applypatch is necessarily broken;"
echo "just that /$WORK_FS doesn't have enough free space to"
echo "properly run this test."
exit 1
fi
testname "apply bsdiff patch"
run_command $WORK_DIR/applypatch $WORK_DIR/old.file - $NEW_SHA1 $NEW_SIZE $BAD1_SHA1:$WORK_DIR/foo $OLD_SHA1:$WORK_DIR/patch.bsdiff || fail
$ADB pull $WORK_DIR/old.file $tmpdir/patched
diff -q $DATA_DIR/new.file $tmpdir/patched || fail
testname "reapply bsdiff patch"
run_command $WORK_DIR/applypatch $WORK_DIR/old.file - $NEW_SHA1 $NEW_SIZE $BAD1_SHA1:$WORK_DIR/foo $OLD_SHA1:$WORK_DIR/patch.bsdiff || fail
$ADB pull $WORK_DIR/old.file $tmpdir/patched
diff -q $DATA_DIR/new.file $tmpdir/patched || fail
# --------------- apply patch in new location ----------------------
$ADB push $DATA_DIR/old.file $WORK_DIR
$ADB push $DATA_DIR/patch.bsdiff $WORK_DIR
# Check that the partition has enough space to apply the patch without
# copying. If it doesn't, we'll be testing the low-space condition
# when we intend to test the not-low-space condition.
testname "apply patch to new location (with enough space)"
free_kb=$(free_space $WORK_FS)
echo "${free_kb}kb free on /$WORK_FS."
if (( free_kb * 1024 < NEW_SIZE * 3 / 2 )); then
echo "Not enough space on /$WORK_FS to patch test file."
echo
echo "This doesn't mean that applypatch is necessarily broken;"
echo "just that /$WORK_FS doesn't have enough free space to"
echo "properly run this test."
exit 1
fi
run_command rm $WORK_DIR/new.file
run_command rm $CACHE_TEMP_SOURCE
testname "apply bsdiff patch to new location"
run_command $WORK_DIR/applypatch $WORK_DIR/old.file $WORK_DIR/new.file $NEW_SHA1 $NEW_SIZE $BAD1_SHA1:$WORK_DIR/foo $OLD_SHA1:$WORK_DIR/patch.bsdiff || fail
$ADB pull $WORK_DIR/new.file $tmpdir/patched
diff -q $DATA_DIR/new.file $tmpdir/patched || fail
testname "reapply bsdiff patch to new location"
run_command $WORK_DIR/applypatch $WORK_DIR/old.file $WORK_DIR/new.file $NEW_SHA1 $NEW_SIZE $BAD1_SHA1:$WORK_DIR/foo $OLD_SHA1:$WORK_DIR/patch.bsdiff || fail
$ADB pull $WORK_DIR/new.file $tmpdir/patched
diff -q $DATA_DIR/new.file $tmpdir/patched || fail
$ADB push $DATA_DIR/old.file $CACHE_TEMP_SOURCE
# put some junk in the old file
run_command dd if=/dev/urandom of=$WORK_DIR/old.file count=100 bs=1024 || fail
testname "apply bsdiff patch to new location with corrupted source"
run_command $WORK_DIR/applypatch $WORK_DIR/old.file $WORK_DIR/new.file $NEW_SHA1 $NEW_SIZE $OLD_SHA1:$WORK_DIR/patch.bsdiff $BAD1_SHA1:$WORK_DIR/foo || fail
$ADB pull $WORK_DIR/new.file $tmpdir/patched
diff -q $DATA_DIR/new.file $tmpdir/patched || fail
# put some junk in the cache copy, too
run_command dd if=/dev/urandom of=$CACHE_TEMP_SOURCE count=100 bs=1024 || fail
run_command rm $WORK_DIR/new.file
testname "apply bsdiff patch to new location with corrupted source and copy (no new file)"
run_command $WORK_DIR/applypatch $WORK_DIR/old.file $WORK_DIR/new.file $NEW_SHA1 $NEW_SIZE $OLD_SHA1:$WORK_DIR/patch.bsdiff $BAD1_SHA1:$WORK_DIR/foo && fail
# put some junk in the new file
run_command dd if=/dev/urandom of=$WORK_DIR/new.file count=100 bs=1024 || fail
testname "apply bsdiff patch to new location with corrupted source and copy (bad new file)"
run_command $WORK_DIR/applypatch $WORK_DIR/old.file $WORK_DIR/new.file $NEW_SHA1 $NEW_SIZE $OLD_SHA1:$WORK_DIR/patch.bsdiff $BAD1_SHA1:$WORK_DIR/foo && fail
# --------------- apply patch with low space on /system ----------------------
$ADB push $DATA_DIR/old.file $WORK_DIR
$ADB push $DATA_DIR/patch.bsdiff $WORK_DIR
free_kb=$(free_space $WORK_FS)
echo "${free_kb}kb free on /$WORK_FS; we'll soon fix that."
echo run_command dd if=/dev/zero of=$WORK_DIR/bloat.dat count=$((free_kb-512)) bs=1024 || fail
run_command dd if=/dev/zero of=$WORK_DIR/bloat.dat count=$((free_kb-512)) bs=1024 || fail
free_kb=$(free_space $WORK_FS)
echo "${free_kb}kb free on /$WORK_FS now."
testname "apply bsdiff patch with low space"
run_command $WORK_DIR/applypatch $WORK_DIR/old.file - $NEW_SHA1 $NEW_SIZE $BAD1_SHA1:$WORK_DIR/foo $OLD_SHA1:$WORK_DIR/patch.bsdiff || fail
$ADB pull $WORK_DIR/old.file $tmpdir/patched
diff -q $DATA_DIR/new.file $tmpdir/patched || fail
testname "reapply bsdiff patch with low space"
run_command $WORK_DIR/applypatch $WORK_DIR/old.file - $NEW_SHA1 $NEW_SIZE $BAD1_SHA1:$WORK_DIR/foo $OLD_SHA1:$WORK_DIR/patch.bsdiff || fail
$ADB pull $WORK_DIR/old.file $tmpdir/patched
diff -q $DATA_DIR/new.file $tmpdir/patched || fail
# --------------- apply patch with low space on /system and /cache ----------------------
$ADB push $DATA_DIR/old.file $WORK_DIR
$ADB push $DATA_DIR/patch.bsdiff $WORK_DIR
free_kb=$(free_space $WORK_FS)
echo "${free_kb}kb free on /$WORK_FS"
run_command mkdir /cache/subdir
run_command 'echo > /cache/subdir/a.file'
run_command 'echo > /cache/a.file'
run_command mkdir /cache/recovery /cache/recovery/otatest
run_command 'echo > /cache/recovery/otatest/b.file'
run_command "echo > $CACHE_TEMP_SOURCE"
free_kb=$(free_space cache)
echo "${free_kb}kb free on /cache; we'll soon fix that."
run_command dd if=/dev/zero of=/cache/bloat_small.dat count=128 bs=1024 || fail
run_command dd if=/dev/zero of=/cache/bloat_large.dat count=$((free_kb-640)) bs=1024 || fail
free_kb=$(free_space cache)
echo "${free_kb}kb free on /cache now."
testname "apply bsdiff patch with low space, full cache, can't delete enough"
$ADB shell 'cat >> /cache/bloat_large.dat' & open_pid=$!
echo "open_pid is $open_pid"
# size check should fail even though it deletes some stuff
run_command $WORK_DIR/applypatch -s $NEW_SIZE && fail
run_command ls /cache/bloat_small.dat && fail # was deleted
run_command ls /cache/a.file && fail # was deleted
run_command ls /cache/recovery/otatest/b.file && fail # was deleted
run_command ls /cache/bloat_large.dat || fail # wasn't deleted because it was open
run_command ls /cache/subdir/a.file || fail # wasn't deleted because it's in a subdir
run_command ls $CACHE_TEMP_SOURCE || fail # wasn't deleted because it's the source file copy
# should fail; not enough files can be deleted
run_command $WORK_DIR/applypatch $WORK_DIR/old.file - $NEW_SHA1 $NEW_SIZE $BAD1_SHA1:$WORK_DIR/foo $OLD_SHA1:$WORK_DIR/patch.bsdiff && fail
run_command ls /cache/bloat_large.dat || fail # wasn't deleted because it was open
run_command ls /cache/subdir/a.file || fail # wasn't deleted because it's in a subdir
run_command ls $CACHE_TEMP_SOURCE || fail # wasn't deleted because it's the source file copy
kill $open_pid # /cache/bloat_large.dat is no longer open
testname "apply bsdiff patch with low space, full cache, can delete enough"
# should succeed after deleting /cache/bloat_large.dat
run_command $WORK_DIR/applypatch -s $NEW_SIZE || fail
run_command ls /cache/bloat_large.dat && fail # was deleted
run_command ls /cache/subdir/a.file || fail # still wasn't deleted because it's in a subdir
run_command ls $CACHE_TEMP_SOURCE || fail # wasn't deleted because it's the source file copy
# should succeed
run_command $WORK_DIR/applypatch $WORK_DIR/old.file - $NEW_SHA1 $NEW_SIZE $BAD1_SHA1:$WORK_DIR/foo $OLD_SHA1:$WORK_DIR/patch.bsdiff || fail
$ADB pull $WORK_DIR/old.file $tmpdir/patched
diff -q $DATA_DIR/new.file $tmpdir/patched || fail
run_command ls /cache/subdir/a.file || fail # still wasn't deleted because it's in a subdir
run_command ls $CACHE_TEMP_SOURCE && fail # was deleted because patching overwrote it, then deleted it
# --------------- apply patch from cache ----------------------
$ADB push $DATA_DIR/old.file $CACHE_TEMP_SOURCE
# put some junk in the old file
run_command dd if=/dev/urandom of=$WORK_DIR/old.file count=100 bs=1024 || fail
testname "apply bsdiff patch from cache (corrupted source) with low space"
run_command $WORK_DIR/applypatch $WORK_DIR/old.file - $NEW_SHA1 $NEW_SIZE $BAD1_SHA1:$WORK_DIR/foo $OLD_SHA1:$WORK_DIR/patch.bsdiff || fail
$ADB pull $WORK_DIR/old.file $tmpdir/patched
diff -q $DATA_DIR/new.file $tmpdir/patched || fail
$ADB push $DATA_DIR/old.file $CACHE_TEMP_SOURCE
# remove the old file entirely
run_command rm $WORK_DIR/old.file
testname "apply bsdiff patch from cache (missing source) with low space"
run_command $WORK_DIR/applypatch $WORK_DIR/old.file - $NEW_SHA1 $NEW_SIZE $BAD1_SHA1:$WORK_DIR/foo $OLD_SHA1:$WORK_DIR/patch.bsdiff || fail
$ADB pull $WORK_DIR/old.file $tmpdir/patched
diff -q $DATA_DIR/new.file $tmpdir/patched || fail
# --------------- cleanup ----------------------
cleanup
echo
echo PASS
echo

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/*
* Copyright (C) 2009 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.
*/
/*
* Most of this code comes from bsdiff.c from the bsdiff-4.3
* distribution, which is:
*/
/*-
* Copyright 2003-2005 Colin Percival
* All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted providing that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <bzlib.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define MIN(x,y) (((x)<(y)) ? (x) : (y))
static void split(off_t *I,off_t *V,off_t start,off_t len,off_t h)
{
off_t i,j,k,x,tmp,jj,kk;
if(len<16) {
for(k=start;k<start+len;k+=j) {
j=1;x=V[I[k]+h];
for(i=1;k+i<start+len;i++) {
if(V[I[k+i]+h]<x) {
x=V[I[k+i]+h];
j=0;
};
if(V[I[k+i]+h]==x) {
tmp=I[k+j];I[k+j]=I[k+i];I[k+i]=tmp;
j++;
};
};
for(i=0;i<j;i++) V[I[k+i]]=k+j-1;
if(j==1) I[k]=-1;
};
return;
};
x=V[I[start+len/2]+h];
jj=0;kk=0;
for(i=start;i<start+len;i++) {
if(V[I[i]+h]<x) jj++;
if(V[I[i]+h]==x) kk++;
};
jj+=start;kk+=jj;
i=start;j=0;k=0;
while(i<jj) {
if(V[I[i]+h]<x) {
i++;
} else if(V[I[i]+h]==x) {
tmp=I[i];I[i]=I[jj+j];I[jj+j]=tmp;
j++;
} else {
tmp=I[i];I[i]=I[kk+k];I[kk+k]=tmp;
k++;
};
};
while(jj+j<kk) {
if(V[I[jj+j]+h]==x) {
j++;
} else {
tmp=I[jj+j];I[jj+j]=I[kk+k];I[kk+k]=tmp;
k++;
};
};
if(jj>start) split(I,V,start,jj-start,h);
for(i=0;i<kk-jj;i++) V[I[jj+i]]=kk-1;
if(jj==kk-1) I[jj]=-1;
if(start+len>kk) split(I,V,kk,start+len-kk,h);
}
static void qsufsort(off_t *I,off_t *V,u_char *old,off_t oldsize)
{
off_t buckets[256];
off_t i,h,len;
for(i=0;i<256;i++) buckets[i]=0;
for(i=0;i<oldsize;i++) buckets[old[i]]++;
for(i=1;i<256;i++) buckets[i]+=buckets[i-1];
for(i=255;i>0;i--) buckets[i]=buckets[i-1];
buckets[0]=0;
for(i=0;i<oldsize;i++) I[++buckets[old[i]]]=i;
I[0]=oldsize;
for(i=0;i<oldsize;i++) V[i]=buckets[old[i]];
V[oldsize]=0;
for(i=1;i<256;i++) if(buckets[i]==buckets[i-1]+1) I[buckets[i]]=-1;
I[0]=-1;
for(h=1;I[0]!=-(oldsize+1);h+=h) {
len=0;
for(i=0;i<oldsize+1;) {
if(I[i]<0) {
len-=I[i];
i-=I[i];
} else {
if(len) I[i-len]=-len;
len=V[I[i]]+1-i;
split(I,V,i,len,h);
i+=len;
len=0;
};
};
if(len) I[i-len]=-len;
};
for(i=0;i<oldsize+1;i++) I[V[i]]=i;
}
static off_t matchlen(u_char *old,off_t oldsize,u_char *new,off_t newsize)
{
off_t i;
for(i=0;(i<oldsize)&&(i<newsize);i++)
if(old[i]!=new[i]) break;
return i;
}
static off_t search(off_t *I,u_char *old,off_t oldsize,
u_char *new,off_t newsize,off_t st,off_t en,off_t *pos)
{
off_t x,y;
if(en-st<2) {
x=matchlen(old+I[st],oldsize-I[st],new,newsize);
y=matchlen(old+I[en],oldsize-I[en],new,newsize);
if(x>y) {
*pos=I[st];
return x;
} else {
*pos=I[en];
return y;
}
};
x=st+(en-st)/2;
if(memcmp(old+I[x],new,MIN(oldsize-I[x],newsize))<0) {
return search(I,old,oldsize,new,newsize,x,en,pos);
} else {
return search(I,old,oldsize,new,newsize,st,x,pos);
};
}
static void offtout(off_t x,u_char *buf)
{
off_t y;
if(x<0) y=-x; else y=x;
buf[0]=y%256;y-=buf[0];
y=y/256;buf[1]=y%256;y-=buf[1];
y=y/256;buf[2]=y%256;y-=buf[2];
y=y/256;buf[3]=y%256;y-=buf[3];
y=y/256;buf[4]=y%256;y-=buf[4];
y=y/256;buf[5]=y%256;y-=buf[5];
y=y/256;buf[6]=y%256;y-=buf[6];
y=y/256;buf[7]=y%256;
if(x<0) buf[7]|=0x80;
}
// This is main() from bsdiff.c, with the following changes:
//
// - old, oldsize, new, newsize are arguments; we don't load this
// data from files. old and new are owned by the caller; we
// don't free them at the end.
//
// - the "I" block of memory is owned by the caller, who passes a
// pointer to *I, which can be NULL. This way if we call
// bsdiff() multiple times with the same 'old' data, we only do
// the qsufsort() step the first time.
//
int bsdiff(u_char* old, off_t oldsize, off_t** IP, u_char* new, off_t newsize,
const char* patch_filename)
{
int fd;
off_t *I;
off_t scan,pos,len;
off_t lastscan,lastpos,lastoffset;
off_t oldscore,scsc;
off_t s,Sf,lenf,Sb,lenb;
off_t overlap,Ss,lens;
off_t i;
off_t dblen,eblen;
u_char *db,*eb;
u_char buf[8];
u_char header[32];
FILE * pf;
BZFILE * pfbz2;
int bz2err;
if (*IP == NULL) {
off_t* V;
*IP = malloc((oldsize+1) * sizeof(off_t));
V = malloc((oldsize+1) * sizeof(off_t));
qsufsort(*IP, V, old, oldsize);
free(V);
}
I = *IP;
if(((db=malloc(newsize+1))==NULL) ||
((eb=malloc(newsize+1))==NULL)) err(1,NULL);
dblen=0;
eblen=0;
/* Create the patch file */
if ((pf = fopen(patch_filename, "w")) == NULL)
err(1, "%s", patch_filename);
/* Header is
0 8 "BSDIFF40"
8 8 length of bzip2ed ctrl block
16 8 length of bzip2ed diff block
24 8 length of new file */
/* File is
0 32 Header
32 ?? Bzip2ed ctrl block
?? ?? Bzip2ed diff block
?? ?? Bzip2ed extra block */
memcpy(header,"BSDIFF40",8);
offtout(0, header + 8);
offtout(0, header + 16);
offtout(newsize, header + 24);
if (fwrite(header, 32, 1, pf) != 1)
err(1, "fwrite(%s)", patch_filename);
/* Compute the differences, writing ctrl as we go */
if ((pfbz2 = BZ2_bzWriteOpen(&bz2err, pf, 9, 0, 0)) == NULL)
errx(1, "BZ2_bzWriteOpen, bz2err = %d", bz2err);
scan=0;len=0;
lastscan=0;lastpos=0;lastoffset=0;
while(scan<newsize) {
oldscore=0;
for(scsc=scan+=len;scan<newsize;scan++) {
len=search(I,old,oldsize,new+scan,newsize-scan,
0,oldsize,&pos);
for(;scsc<scan+len;scsc++)
if((scsc+lastoffset<oldsize) &&
(old[scsc+lastoffset] == new[scsc]))
oldscore++;
if(((len==oldscore) && (len!=0)) ||
(len>oldscore+8)) break;
if((scan+lastoffset<oldsize) &&
(old[scan+lastoffset] == new[scan]))
oldscore--;
};
if((len!=oldscore) || (scan==newsize)) {
s=0;Sf=0;lenf=0;
for(i=0;(lastscan+i<scan)&&(lastpos+i<oldsize);) {
if(old[lastpos+i]==new[lastscan+i]) s++;
i++;
if(s*2-i>Sf*2-lenf) { Sf=s; lenf=i; };
};
lenb=0;
if(scan<newsize) {
s=0;Sb=0;
for(i=1;(scan>=lastscan+i)&&(pos>=i);i++) {
if(old[pos-i]==new[scan-i]) s++;
if(s*2-i>Sb*2-lenb) { Sb=s; lenb=i; };
};
};
if(lastscan+lenf>scan-lenb) {
overlap=(lastscan+lenf)-(scan-lenb);
s=0;Ss=0;lens=0;
for(i=0;i<overlap;i++) {
if(new[lastscan+lenf-overlap+i]==
old[lastpos+lenf-overlap+i]) s++;
if(new[scan-lenb+i]==
old[pos-lenb+i]) s--;
if(s>Ss) { Ss=s; lens=i+1; };
};
lenf+=lens-overlap;
lenb-=lens;
};
for(i=0;i<lenf;i++)
db[dblen+i]=new[lastscan+i]-old[lastpos+i];
for(i=0;i<(scan-lenb)-(lastscan+lenf);i++)
eb[eblen+i]=new[lastscan+lenf+i];
dblen+=lenf;
eblen+=(scan-lenb)-(lastscan+lenf);
offtout(lenf,buf);
BZ2_bzWrite(&bz2err, pfbz2, buf, 8);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
offtout((scan-lenb)-(lastscan+lenf),buf);
BZ2_bzWrite(&bz2err, pfbz2, buf, 8);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
offtout((pos-lenb)-(lastpos+lenf),buf);
BZ2_bzWrite(&bz2err, pfbz2, buf, 8);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
lastscan=scan-lenb;
lastpos=pos-lenb;
lastoffset=pos-scan;
};
};
BZ2_bzWriteClose(&bz2err, pfbz2, 0, NULL, NULL);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWriteClose, bz2err = %d", bz2err);
/* Compute size of compressed ctrl data */
if ((len = ftello(pf)) == -1)
err(1, "ftello");
offtout(len-32, header + 8);
/* Write compressed diff data */
if ((pfbz2 = BZ2_bzWriteOpen(&bz2err, pf, 9, 0, 0)) == NULL)
errx(1, "BZ2_bzWriteOpen, bz2err = %d", bz2err);
BZ2_bzWrite(&bz2err, pfbz2, db, dblen);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
BZ2_bzWriteClose(&bz2err, pfbz2, 0, NULL, NULL);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWriteClose, bz2err = %d", bz2err);
/* Compute size of compressed diff data */
if ((newsize = ftello(pf)) == -1)
err(1, "ftello");
offtout(newsize - len, header + 16);
/* Write compressed extra data */
if ((pfbz2 = BZ2_bzWriteOpen(&bz2err, pf, 9, 0, 0)) == NULL)
errx(1, "BZ2_bzWriteOpen, bz2err = %d", bz2err);
BZ2_bzWrite(&bz2err, pfbz2, eb, eblen);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
BZ2_bzWriteClose(&bz2err, pfbz2, 0, NULL, NULL);
if (bz2err != BZ_OK)
errx(1, "BZ2_bzWriteClose, bz2err = %d", bz2err);
/* Seek to the beginning, write the header, and close the file */
if (fseeko(pf, 0, SEEK_SET))
err(1, "fseeko");
if (fwrite(header, 32, 1, pf) != 1)
err(1, "fwrite(%s)", patch_filename);
if (fclose(pf))
err(1, "fclose");
/* Free the memory we used */
free(db);
free(eb);
return 0;
}

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/*
* 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.
*/
// This file is a nearly line-for-line copy of bspatch.c from the
// bsdiff-4.3 distribution; the primary differences being how the
// input and output data are read and the error handling. Running
// applypatch with the -l option will display the bsdiff license
// notice.
#include <stdio.h>
#include <sys/stat.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <bzlib.h>
#include "mincrypt/sha.h"
#include "applypatch.h"
void ShowBSDiffLicense() {
puts("The bsdiff library used herein is:\n"
"\n"
"Copyright 2003-2005 Colin Percival\n"
"All rights reserved\n"
"\n"
"Redistribution and use in source and binary forms, with or without\n"
"modification, are permitted providing that the following conditions\n"
"are met:\n"
"1. Redistributions of source code must retain the above copyright\n"
" notice, this list of conditions and the following disclaimer.\n"
"2. Redistributions in binary form must reproduce the above copyright\n"
" notice, this list of conditions and the following disclaimer in the\n"
" documentation and/or other materials provided with the distribution.\n"
"\n"
"THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
"IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\n"
"WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\n"
"ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY\n"
"DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\n"
"DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\n"
"OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\n"
"HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,\n"
"STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING\n"
"IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\n"
"POSSIBILITY OF SUCH DAMAGE.\n"
"\n------------------\n\n"
"This program uses Julian R Seward's \"libbzip2\" library, available\n"
"from http://www.bzip.org/.\n"
);
}
static off_t offtin(u_char *buf)
{
off_t y;
y=buf[7]&0x7F;
y=y*256;y+=buf[6];
y=y*256;y+=buf[5];
y=y*256;y+=buf[4];
y=y*256;y+=buf[3];
y=y*256;y+=buf[2];
y=y*256;y+=buf[1];
y=y*256;y+=buf[0];
if(buf[7]&0x80) y=-y;
return y;
}
int ApplyBSDiffPatch(const unsigned char* old_data, ssize_t old_size,
const char* patch_filename, ssize_t patch_offset,
SinkFn sink, void* token, SHA_CTX* ctx) {
unsigned char* new_data;
ssize_t new_size;
if (ApplyBSDiffPatchMem(old_data, old_size, patch_filename, patch_offset,
&new_data, &new_size) != 0) {
return -1;
}
if (sink(new_data, new_size, token) < new_size) {
fprintf(stderr, "short write of output: %d (%s)\n", errno, strerror(errno));
return 1;
}
if (ctx) {
SHA_update(ctx, new_data, new_size);
}
free(new_data);
return 0;
}
int ApplyBSDiffPatchMem(const unsigned char* old_data, ssize_t old_size,
const char* patch_filename, ssize_t patch_offset,
unsigned char** new_data, ssize_t* new_size) {
FILE* f;
if ((f = fopen(patch_filename, "rb")) == NULL) {
fprintf(stderr, "failed to open patch file\n");
return 1;
}
// File format:
// 0 8 "BSDIFF40"
// 8 8 X
// 16 8 Y
// 24 8 sizeof(newfile)
// 32 X bzip2(control block)
// 32+X Y bzip2(diff block)
// 32+X+Y ??? bzip2(extra block)
// with control block a set of triples (x,y,z) meaning "add x bytes
// from oldfile to x bytes from the diff block; copy y bytes from the
// extra block; seek forwards in oldfile by z bytes".
fseek(f, patch_offset, SEEK_SET);
unsigned char header[32];
if (fread(header, 1, 32, f) < 32) {
fprintf(stderr, "failed to read patch file header\n");
return 1;
}
if (memcmp(header, "BSDIFF40", 8) != 0) {
fprintf(stderr, "corrupt bsdiff patch file header (magic number)\n");
return 1;
}
ssize_t ctrl_len, data_len;
ctrl_len = offtin(header+8);
data_len = offtin(header+16);
*new_size = offtin(header+24);
if (ctrl_len < 0 || data_len < 0 || *new_size < 0) {
fprintf(stderr, "corrupt patch file header (data lengths)\n");
return 1;
}
fclose(f);
int bzerr;
#define OPEN_AT(f, bzf, offset) \
FILE* f; \
BZFILE* bzf; \
if ((f = fopen(patch_filename, "rb")) == NULL) { \
fprintf(stderr, "failed to open patch file\n"); \
return 1; \
} \
if (fseeko(f, offset+patch_offset, SEEK_SET)) { \
fprintf(stderr, "failed to seek in patch file\n"); \
return 1; \
} \
if ((bzf = BZ2_bzReadOpen(&bzerr, f, 0, 0, NULL, 0)) == NULL) { \
fprintf(stderr, "failed to bzReadOpen in patch file (%d)\n", bzerr); \
return 1; \
}
OPEN_AT(cpf, cpfbz2, 32);
OPEN_AT(dpf, dpfbz2, 32+ctrl_len);
OPEN_AT(epf, epfbz2, 32+ctrl_len+data_len);
#undef OPEN_AT
*new_data = malloc(*new_size);
if (*new_data == NULL) {
fprintf(stderr, "failed to allocate %d bytes of memory for output file\n",
(int)*new_size);
return 1;
}
off_t oldpos = 0, newpos = 0;
off_t ctrl[3];
off_t len_read;
int i;
unsigned char buf[8];
while (newpos < *new_size) {
// Read control data
for (i = 0; i < 3; ++i) {
len_read = BZ2_bzRead(&bzerr, cpfbz2, buf, 8);
if (len_read < 8 || !(bzerr == BZ_OK || bzerr == BZ_STREAM_END)) {
fprintf(stderr, "corrupt patch (read control)\n");
return 1;
}
ctrl[i] = offtin(buf);
}
// Sanity check
if (newpos + ctrl[0] > *new_size) {
fprintf(stderr, "corrupt patch (new file overrun)\n");
return 1;
}
// Read diff string
len_read = BZ2_bzRead(&bzerr, dpfbz2, *new_data + newpos, ctrl[0]);
if (len_read < ctrl[0] || !(bzerr == BZ_OK || bzerr == BZ_STREAM_END)) {
fprintf(stderr, "corrupt patch (read diff)\n");
return 1;
}
// Add old data to diff string
for (i = 0; i < ctrl[0]; ++i) {
if ((oldpos+i >= 0) && (oldpos+i < old_size)) {
(*new_data)[newpos+i] += old_data[oldpos+i];
}
}
// Adjust pointers
newpos += ctrl[0];
oldpos += ctrl[0];
// Sanity check
if (newpos + ctrl[1] > *new_size) {
fprintf(stderr, "corrupt patch (new file overrun)\n");
return 1;
}
// Read extra string
len_read = BZ2_bzRead(&bzerr, epfbz2, *new_data + newpos, ctrl[1]);
if (len_read < ctrl[1] || !(bzerr == BZ_OK || bzerr == BZ_STREAM_END)) {
fprintf(stderr, "corrupt patch (read extra)\n");
return 1;
}
// Adjust pointers
newpos += ctrl[1];
oldpos += ctrl[2];
}
BZ2_bzReadClose(&bzerr, cpfbz2);
BZ2_bzReadClose(&bzerr, dpfbz2);
BZ2_bzReadClose(&bzerr, epfbz2);
fclose(cpf);
fclose(dpf);
fclose(epf);
return 0;
}

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#include <errno.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <unistd.h>
#include <dirent.h>
#include <ctype.h>
#include "applypatch.h"
static int EliminateOpenFiles(char** files, int file_count) {
DIR* d;
struct dirent* de;
d = opendir("/proc");
if (d == NULL) {
printf("error opening /proc: %s\n", strerror(errno));
return -1;
}
while ((de = readdir(d)) != 0) {
int i;
for (i = 0; de->d_name[i] != '\0' && isdigit(de->d_name[i]); ++i);
if (de->d_name[i]) continue;
// de->d_name[i] is numeric
char path[FILENAME_MAX];
strcpy(path, "/proc/");
strcat(path, de->d_name);
strcat(path, "/fd/");
DIR* fdd;
struct dirent* fdde;
fdd = opendir(path);
if (fdd == NULL) {
printf("error opening %s: %s\n", path, strerror(errno));
continue;
}
while ((fdde = readdir(fdd)) != 0) {
char fd_path[FILENAME_MAX];
char link[FILENAME_MAX];
strcpy(fd_path, path);
strcat(fd_path, fdde->d_name);
int count;
count = readlink(fd_path, link, sizeof(link)-1);
if (count >= 0) {
link[count] = '\0';
// This is inefficient, but it should only matter if there are
// lots of files in /cache, and lots of them are open (neither
// of which should be true, especially in recovery).
if (strncmp(link, "/cache/", 7) == 0) {
int j;
for (j = 0; j < file_count; ++j) {
if (files[j] && strcmp(files[j], link) == 0) {
printf("%s is open by %s\n", link, de->d_name);
free(files[j]);
files[j] = NULL;
}
}
}
}
}
closedir(fdd);
}
closedir(d);
return 0;
}
int FindExpendableFiles(char*** names, int* entries) {
DIR* d;
struct dirent* de;
int size = 32;
*entries = 0;
*names = malloc(size * sizeof(char*));
char path[FILENAME_MAX];
// We're allowed to delete unopened regular files in any of these
// directories.
const char* dirs[2] = {"/cache", "/cache/recovery/otatest"};
unsigned int i;
for (i = 0; i < sizeof(dirs)/sizeof(dirs[0]); ++i) {
d = opendir(dirs[i]);
if (d == NULL) {
printf("error opening %s: %s\n", dirs[i], strerror(errno));
continue;
}
// Look for regular files in the directory (not in any subdirectories).
while ((de = readdir(d)) != 0) {
strcpy(path, dirs[i]);
strcat(path, "/");
strcat(path, de->d_name);
// We can't delete CACHE_TEMP_SOURCE; if it's there we might have
// restarted during installation and could be depending on it to
// be there.
if (strcmp(path, CACHE_TEMP_SOURCE) == 0) continue;
struct stat st;
if (stat(path, &st) == 0 && S_ISREG(st.st_mode)) {
if (*entries >= size) {
size *= 2;
*names = realloc(*names, size * sizeof(char*));
}
(*names)[(*entries)++] = strdup(path);
}
}
closedir(d);
}
printf("%d regular files in deletable directories\n", *entries);
if (EliminateOpenFiles(*names, *entries) < 0) {
return -1;
}
return 0;
}
int MakeFreeSpaceOnCache(size_t bytes_needed) {
size_t free_now = FreeSpaceForFile("/cache");
printf("%ld bytes free on /cache (%ld needed)\n",
(long)free_now, (long)bytes_needed);
if (free_now >= bytes_needed) {
return 0;
}
char** names;
int entries;
if (FindExpendableFiles(&names, &entries) < 0) {
return -1;
}
if (entries == 0) {
// nothing we can delete to free up space!
printf("no files can be deleted to free space on /cache\n");
return -1;
}
// We could try to be smarter about which files to delete: the
// biggest ones? the smallest ones that will free up enough space?
// the oldest? the newest?
//
// Instead, we'll be dumb.
int i;
for (i = 0; i < entries && free_now < bytes_needed; ++i) {
if (names[i]) {
unlink(names[i]);
free_now = FreeSpaceForFile("/cache");
printf("deleted %s; now %ld bytes free\n", names[i], (long)free_now);
free(names[i]);
}
}
for (; i < entries; ++i) {
free(names[i]);
}
free(names);
return (free_now >= bytes_needed) ? 0 : -1;
}

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applypatch/imgdiff.h Normal file
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/*
* Copyright (C) 2009 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.
*/
// Image patch chunk types
#define CHUNK_NORMAL 0
#define CHUNK_GZIP 1 // version 1 only
#define CHUNK_DEFLATE 2 // version 2 only
#define CHUNK_RAW 3 // version 2 only
// The gzip header size is actually variable, but we currently don't
// support gzipped data with any of the optional fields, so for now it
// will always be ten bytes. See RFC 1952 for the definition of the
// gzip format.
#define GZIP_HEADER_LEN 10
// The gzip footer size really is fixed.
#define GZIP_FOOTER_LEN 8

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#!/bin/bash
#
# A script for testing imgdiff/applypatch. It takes two full OTA
# packages as arguments. It generates (on the host) patches for all
# the zip/jar/apk files they have in common, as well as boot and
# recovery images. It then applies the patches on the device (or
# emulator) and checks that the resulting file is correct.
EMULATOR_PORT=5580
# set to 0 to use a device instead
USE_EMULATOR=0
# where on the device to do all the patching.
WORK_DIR=/data/local/tmp
START_OTA_PACKAGE=$1
END_OTA_PACKAGE=$2
# ------------------------
tmpdir=$(mktemp -d)
if [ "$USE_EMULATOR" == 1 ]; then
emulator -wipe-data -noaudio -no-window -port $EMULATOR_PORT &
pid_emulator=$!
ADB="adb -s emulator-$EMULATOR_PORT "
else
ADB="adb -d "
fi
echo "waiting to connect to device"
$ADB wait-for-device
# run a command on the device; exit with the exit status of the device
# command.
run_command() {
$ADB shell "$@" \; echo \$? | awk '{if (b) {print a}; a=$0; b=1} END {exit a}'
}
testname() {
echo
echo "$1"...
testname="$1"
}
fail() {
echo
echo FAIL: $testname
echo
[ "$open_pid" == "" ] || kill $open_pid
[ "$pid_emulator" == "" ] || kill $pid_emulator
exit 1
}
sha1() {
sha1sum $1 | awk '{print $1}'
}
size() {
stat -c %s $1 | tr -d '\n'
}
cleanup() {
# not necessary if we're about to kill the emulator, but nice for
# running on real devices or already-running emulators.
testname "removing test files"
run_command rm $WORK_DIR/applypatch
run_command rm $WORK_DIR/source
run_command rm $WORK_DIR/target
run_command rm $WORK_DIR/patch
[ "$pid_emulator" == "" ] || kill $pid_emulator
rm -rf $tmpdir
}
$ADB push $ANDROID_PRODUCT_OUT/system/bin/applypatch $WORK_DIR/applypatch
patch_and_apply() {
local fn=$1
shift
unzip -p $START_OTA_PACKAGE $fn > $tmpdir/source
unzip -p $END_OTA_PACKAGE $fn > $tmpdir/target
imgdiff "$@" $tmpdir/source $tmpdir/target $tmpdir/patch
bsdiff $tmpdir/source $tmpdir/target $tmpdir/patch.bs
echo "patch for $fn is $(size $tmpdir/patch) [of $(size $tmpdir/target)] ($(size $tmpdir/patch.bs) with bsdiff)"
echo "$fn $(size $tmpdir/patch) of $(size $tmpdir/target) bsdiff $(size $tmpdir/patch.bs)" >> /tmp/stats.txt
$ADB push $tmpdir/source $WORK_DIR/source || fail "source push failed"
run_command rm /data/local/tmp/target
$ADB push $tmpdir/patch $WORK_DIR/patch || fail "patch push failed"
run_command /data/local/tmp/applypatch /data/local/tmp/source \
/data/local/tmp/target $(sha1 $tmpdir/target) $(size $tmpdir/target) \
$(sha1 $tmpdir/source):/data/local/tmp/patch \
|| fail "applypatch of $fn failed"
$ADB pull /data/local/tmp/target $tmpdir/result
diff -q $tmpdir/target $tmpdir/result || fail "patch output not correct!"
}
# --------------- basic execution ----------------------
for i in $((zipinfo -1 $START_OTA_PACKAGE; zipinfo -1 $END_OTA_PACKAGE) | \
sort | uniq -d | egrep -e '[.](apk|jar|zip)$'); do
patch_and_apply $i -z
done
patch_and_apply boot.img
patch_and_apply system/recovery.img
# --------------- cleanup ----------------------
cleanup
echo
echo PASS
echo

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/*
* Copyright (C) 2009 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.
*/
// See imgdiff.c in this directory for a description of the patch file
// format.
#include <stdio.h>
#include <sys/stat.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include "zlib.h"
#include "mincrypt/sha.h"
#include "applypatch.h"
#include "imgdiff.h"
#include "utils.h"
/*
* Apply the patch given in 'patch_filename' to the source data given
* by (old_data, old_size). Write the patched output to the 'output'
* file, and update the SHA context with the output data as well.
* Return 0 on success.
*/
int ApplyImagePatch(const unsigned char* old_data, ssize_t old_size,
const char* patch_filename,
SinkFn sink, void* token, SHA_CTX* ctx) {
FILE* f;
if ((f = fopen(patch_filename, "rb")) == NULL) {
printf("failed to open patch file\n");
return -1;
}
unsigned char header[12];
if (fread(header, 1, 12, f) != 12) {
printf("failed to read patch file header\n");
return -1;
}
// IMGDIFF1 uses CHUNK_NORMAL and CHUNK_GZIP.
// IMGDIFF2 uses CHUNK_NORMAL, CHUNK_DEFLATE, and CHUNK_RAW.
if (memcmp(header, "IMGDIFF", 7) != 0 ||
(header[7] != '1' && header[7] != '2')) {
printf("corrupt patch file header (magic number)\n");
return -1;
}
int num_chunks = Read4(header+8);
int i;
for (i = 0; i < num_chunks; ++i) {
// each chunk's header record starts with 4 bytes.
unsigned char chunk[4];
if (fread(chunk, 1, 4, f) != 4) {
printf("failed to read chunk %d record\n", i);
return -1;
}
int type = Read4(chunk);
if (type == CHUNK_NORMAL) {
unsigned char normal_header[24];
if (fread(normal_header, 1, 24, f) != 24) {
printf("failed to read chunk %d normal header data\n", i);
return -1;
}
size_t src_start = Read8(normal_header);
size_t src_len = Read8(normal_header+8);
size_t patch_offset = Read8(normal_header+16);
printf("CHUNK %d: normal patch offset %d\n", i, patch_offset);
ApplyBSDiffPatch(old_data + src_start, src_len,
patch_filename, patch_offset,
sink, token, ctx);
} else if (type == CHUNK_GZIP) {
// This branch is basically a duplicate of the CHUNK_DEFLATE
// branch, with a bit of extra processing for the gzip header
// and footer. I've avoided factoring the common code out since
// this branch will just be deleted when we drop support for
// IMGDIFF1.
// gzip chunks have an additional 64 + gzip_header_len + 8 bytes
// in their chunk header.
unsigned char* gzip = malloc(64);
if (fread(gzip, 1, 64, f) != 64) {
printf("failed to read chunk %d initial gzip header data\n",
i);
return -1;
}
size_t gzip_header_len = Read4(gzip+60);
gzip = realloc(gzip, 64 + gzip_header_len + 8);
if (fread(gzip+64, 1, gzip_header_len+8, f) != gzip_header_len+8) {
printf("failed to read chunk %d remaining gzip header data\n",
i);
return -1;
}
size_t src_start = Read8(gzip);
size_t src_len = Read8(gzip+8);
size_t patch_offset = Read8(gzip+16);
size_t expanded_len = Read8(gzip+24);
size_t target_len = Read8(gzip+32);
int gz_level = Read4(gzip+40);
int gz_method = Read4(gzip+44);
int gz_windowBits = Read4(gzip+48);
int gz_memLevel = Read4(gzip+52);
int gz_strategy = Read4(gzip+56);
printf("CHUNK %d: gzip patch offset %d\n", i, patch_offset);
// Decompress the source data; the chunk header tells us exactly
// how big we expect it to be when decompressed.
unsigned char* expanded_source = malloc(expanded_len);
if (expanded_source == NULL) {
printf("failed to allocate %d bytes for expanded_source\n",
expanded_len);
return -1;
}
z_stream strm;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = src_len - (gzip_header_len + 8);
strm.next_in = (unsigned char*)(old_data + src_start + gzip_header_len);
strm.avail_out = expanded_len;
strm.next_out = expanded_source;
int ret;
ret = inflateInit2(&strm, -15);
if (ret != Z_OK) {
printf("failed to init source inflation: %d\n", ret);
return -1;
}
// Because we've provided enough room to accommodate the output
// data, we expect one call to inflate() to suffice.
ret = inflate(&strm, Z_SYNC_FLUSH);
if (ret != Z_STREAM_END) {
printf("source inflation returned %d\n", ret);
return -1;
}
// We should have filled the output buffer exactly.
if (strm.avail_out != 0) {
printf("source inflation short by %d bytes\n", strm.avail_out);
return -1;
}
inflateEnd(&strm);
// Next, apply the bsdiff patch (in memory) to the uncompressed
// data.
unsigned char* uncompressed_target_data;
ssize_t uncompressed_target_size;
if (ApplyBSDiffPatchMem(expanded_source, expanded_len,
patch_filename, patch_offset,
&uncompressed_target_data,
&uncompressed_target_size) != 0) {
return -1;
}
// Now compress the target data and append it to the output.
// start with the gzip header.
sink(gzip+64, gzip_header_len, token);
SHA_update(ctx, gzip+64, gzip_header_len);
// we're done with the expanded_source data buffer, so we'll
// reuse that memory to receive the output of deflate.
unsigned char* temp_data = expanded_source;
ssize_t temp_size = expanded_len;
if (temp_size < 32768) {
// ... unless the buffer is too small, in which case we'll
// allocate a fresh one.
free(temp_data);
temp_data = malloc(32768);
temp_size = 32768;
}
// now the deflate stream
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = uncompressed_target_size;
strm.next_in = uncompressed_target_data;
ret = deflateInit2(&strm, gz_level, gz_method, gz_windowBits,
gz_memLevel, gz_strategy);
do {
strm.avail_out = temp_size;
strm.next_out = temp_data;
ret = deflate(&strm, Z_FINISH);
size_t have = temp_size - strm.avail_out;
if (sink(temp_data, have, token) != have) {
printf("failed to write %d compressed bytes to output\n",
have);
return -1;
}
SHA_update(ctx, temp_data, have);
} while (ret != Z_STREAM_END);
deflateEnd(&strm);
// lastly, the gzip footer.
sink(gzip+64+gzip_header_len, 8, token);
SHA_update(ctx, gzip+64+gzip_header_len, 8);
free(temp_data);
free(uncompressed_target_data);
free(gzip);
} else if (type == CHUNK_RAW) {
unsigned char raw_header[4];
if (fread(raw_header, 1, 4, f) != 4) {
printf("failed to read chunk %d raw header data\n", i);
return -1;
}
size_t data_len = Read4(raw_header);
printf("CHUNK %d: raw data %d\n", i, data_len);
unsigned char* temp = malloc(data_len);
if (fread(temp, 1, data_len, f) != data_len) {
printf("failed to read chunk %d raw data\n", i);
return -1;
}
SHA_update(ctx, temp, data_len);
if (sink(temp, data_len, token) != data_len) {
printf("failed to write chunk %d raw data\n", i);
return -1;
}
} else if (type == CHUNK_DEFLATE) {
// deflate chunks have an additional 60 bytes in their chunk header.
unsigned char deflate_header[60];
if (fread(deflate_header, 1, 60, f) != 60) {
printf("failed to read chunk %d deflate header data\n", i);
return -1;
}
size_t src_start = Read8(deflate_header);
size_t src_len = Read8(deflate_header+8);
size_t patch_offset = Read8(deflate_header+16);
size_t expanded_len = Read8(deflate_header+24);
size_t target_len = Read8(deflate_header+32);
int level = Read4(deflate_header+40);
int method = Read4(deflate_header+44);
int windowBits = Read4(deflate_header+48);
int memLevel = Read4(deflate_header+52);
int strategy = Read4(deflate_header+56);
printf("CHUNK %d: deflate patch offset %d\n", i, patch_offset);
// Decompress the source data; the chunk header tells us exactly
// how big we expect it to be when decompressed.
unsigned char* expanded_source = malloc(expanded_len);
if (expanded_source == NULL) {
printf("failed to allocate %d bytes for expanded_source\n",
expanded_len);
return -1;
}
z_stream strm;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = src_len;
strm.next_in = (unsigned char*)(old_data + src_start);
strm.avail_out = expanded_len;
strm.next_out = expanded_source;
int ret;
ret = inflateInit2(&strm, -15);
if (ret != Z_OK) {
printf("failed to init source inflation: %d\n", ret);
return -1;
}
// Because we've provided enough room to accommodate the output
// data, we expect one call to inflate() to suffice.
ret = inflate(&strm, Z_SYNC_FLUSH);
if (ret != Z_STREAM_END) {
printf("source inflation returned %d\n", ret);
return -1;
}
// We should have filled the output buffer exactly.
if (strm.avail_out != 0) {
printf("source inflation short by %d bytes\n", strm.avail_out);
return -1;
}
inflateEnd(&strm);
// Next, apply the bsdiff patch (in memory) to the uncompressed
// data.
unsigned char* uncompressed_target_data;
ssize_t uncompressed_target_size;
if (ApplyBSDiffPatchMem(expanded_source, expanded_len,
patch_filename, patch_offset,
&uncompressed_target_data,
&uncompressed_target_size) != 0) {
return -1;
}
// Now compress the target data and append it to the output.
// we're done with the expanded_source data buffer, so we'll
// reuse that memory to receive the output of deflate.
unsigned char* temp_data = expanded_source;
ssize_t temp_size = expanded_len;
if (temp_size < 32768) {
// ... unless the buffer is too small, in which case we'll
// allocate a fresh one.
free(temp_data);
temp_data = malloc(32768);
temp_size = 32768;
}
// now the deflate stream
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = uncompressed_target_size;
strm.next_in = uncompressed_target_data;
ret = deflateInit2(&strm, level, method, windowBits, memLevel, strategy);
do {
strm.avail_out = temp_size;
strm.next_out = temp_data;
ret = deflate(&strm, Z_FINISH);
size_t have = temp_size - strm.avail_out;
if (sink(temp_data, have, token) != have) {
printf("failed to write %d compressed bytes to output\n",
have);
return -1;
}
SHA_update(ctx, temp_data, have);
} while (ret != Z_STREAM_END);
deflateEnd(&strm);
free(temp_data);
free(uncompressed_target_data);
} else {
printf("patch chunk %d is unknown type %d\n", i, type);
return -1;
}
}
return 0;
}

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applypatch/main.c Normal file
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@ -0,0 +1,60 @@
/*
* Copyright (C) 2009 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 <stdio.h>
extern int applypatch(int argc, char** argv);
// This program 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 <tgt-file> is <tgt-sha1>, does nothing and exits
// successfully.
//
// - otherwise, if the sha1 hash of <src-file> is <src-sha1>, applies the
// bsdiff <patch> to <src-file> to produce a new file (the type of patch
// is automatically detected from the file header). If that new
// file has sha1 hash <tgt-sha1>, moves it to replace <tgt-file>, and
// exits successfully. Note that if <src-file> and <tgt-file> are
// not the same, <src-file> is NOT deleted on success. <tgt-file>
// may be the string "-" to mean "the same as src-file".
//
// - otherwise, or if any error is encountered, exits with non-zero
// status.
//
// <src-file> (or <file> in check mode) may refer to an MTD partition
// to read the source data. See the comments for the
// LoadMTDContents() function above for the format of such a filename.
int main(int argc, char** argv) {
int result = applypatch(argc, argv);
if (result == 2) {
printf(
"usage: %s <src-file> <tgt-file> <tgt-sha1> <tgt-size> "
"[<src-sha1>:<patch> ...]\n"
" or %s -c <file> [<sha1> ...]\n"
" or %s -s <bytes>\n"
" or %s -l\n"
"\n"
"Filenames may be of the form\n"
" MTD:<partition>:<len_1>:<sha1_1>:<len_2>:<sha1_2>:...\n"
"to specify reading from or writing to an MTD partition.\n\n",
argv[0], argv[0], argv[0], argv[0]);
}
return result;
}

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applypatch/utils.c Normal file
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@ -0,0 +1,62 @@
/*
* Copyright (C) 2009 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 <stdio.h>
#include "utils.h"
/** Write a 4-byte value to f in little-endian order. */
void Write4(int value, FILE* f) {
fputc(value & 0xff, f);
fputc((value >> 8) & 0xff, f);
fputc((value >> 16) & 0xff, f);
fputc((value >> 24) & 0xff, f);
}
/** Write an 8-byte value to f in little-endian order. */
void Write8(long long value, FILE* f) {
fputc(value & 0xff, f);
fputc((value >> 8) & 0xff, f);
fputc((value >> 16) & 0xff, f);
fputc((value >> 24) & 0xff, f);
fputc((value >> 32) & 0xff, f);
fputc((value >> 40) & 0xff, f);
fputc((value >> 48) & 0xff, f);
fputc((value >> 56) & 0xff, f);
}
int Read2(unsigned char* p) {
return (int)(((unsigned int)p[1] << 8) |
(unsigned int)p[0]);
}
int Read4(unsigned char* p) {
return (int)(((unsigned int)p[3] << 24) |
((unsigned int)p[2] << 16) |
((unsigned int)p[1] << 8) |
(unsigned int)p[0]);
}
long long Read8(unsigned char* p) {
return (long long)(((unsigned long long)p[7] << 56) |
((unsigned long long)p[6] << 48) |
((unsigned long long)p[5] << 40) |
((unsigned long long)p[4] << 32) |
((unsigned long long)p[3] << 24) |
((unsigned long long)p[2] << 16) |
((unsigned long long)p[1] << 8) |
(unsigned long long)p[0]);
}

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applypatch/utils.h Normal file
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@ -0,0 +1,30 @@
/*
* Copyright (C) 2009 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.
*/
#ifndef _BUILD_TOOLS_APPLYPATCH_UTILS_H
#define _BUILD_TOOLS_APPLYPATCH_UTILS_H
#include <stdio.h>
// Read and write little-endian values of various sizes.
void Write4(int value, FILE* f);
void Write8(long long value, FILE* f);
int Read2(unsigned char* p);
int Read4(unsigned char* p);
long long Read8(unsigned char* p);
#endif // _BUILD_TOOLS_APPLYPATCH_UTILS_H

161
edify/expr.c
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@ -33,12 +33,39 @@ int BooleanString(const char* s) {
}
char* Evaluate(State* state, Expr* expr) {
Value* v = expr->fn(expr->name, state, expr->argc, expr->argv);
if (v == NULL) return NULL;
if (v->type != VAL_STRING) {
ErrorAbort(state, "expecting string, got value type %d", v->type);
FreeValue(v);
return NULL;
}
char* result = v->data;
free(v);
return result;
}
Value* EvaluateValue(State* state, Expr* expr) {
return expr->fn(expr->name, state, expr->argc, expr->argv);
}
char* ConcatFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* StringValue(char* str) {
Value* v = malloc(sizeof(Value));
v->type = VAL_STRING;
v->size = strlen(str);
v->data = str;
return v;
}
void FreeValue(Value* v) {
if (v == NULL) return;
free(v->data);
free(v);
}
Value* ConcatFn(const char* name, State* state, int argc, Expr* argv[]) {
if (argc == 0) {
return strdup("");
return StringValue(strdup(""));
}
char** strings = malloc(argc * sizeof(char*));
int i;
@ -68,10 +95,10 @@ char* ConcatFn(const char* name, State* state, int argc, Expr* argv[]) {
free(strings[i]);
}
free(strings);
return result;
return StringValue(result);
}
char* IfElseFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* IfElseFn(const char* name, State* state, int argc, Expr* argv[]) {
if (argc != 2 && argc != 3) {
free(state->errmsg);
state->errmsg = strdup("ifelse expects 2 or 3 arguments");
@ -84,18 +111,18 @@ char* IfElseFn(const char* name, State* state, int argc, Expr* argv[]) {
if (BooleanString(cond) == true) {
free(cond);
return Evaluate(state, argv[1]);
return EvaluateValue(state, argv[1]);
} else {
if (argc == 3) {
free(cond);
return Evaluate(state, argv[2]);
return EvaluateValue(state, argv[2]);
} else {
return cond;
return StringValue(cond);
}
}
}
char* AbortFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* AbortFn(const char* name, State* state, int argc, Expr* argv[]) {
char* msg = NULL;
if (argc > 0) {
msg = Evaluate(state, argv[0]);
@ -109,7 +136,7 @@ char* AbortFn(const char* name, State* state, int argc, Expr* argv[]) {
return NULL;
}
char* AssertFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* AssertFn(const char* name, State* state, int argc, Expr* argv[]) {
int i;
for (i = 0; i < argc; ++i) {
char* v = Evaluate(state, argv[i]);
@ -131,20 +158,20 @@ char* AssertFn(const char* name, State* state, int argc, Expr* argv[]) {
return NULL;
}
}
return strdup("");
return StringValue(strdup(""));
}
char* SleepFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* SleepFn(const char* name, State* state, int argc, Expr* argv[]) {
char* val = Evaluate(state, argv[0]);
if (val == NULL) {
return NULL;
}
int v = strtol(val, NULL, 10);
sleep(v);
return val;
return StringValue(val);
}
char* StdoutFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* StdoutFn(const char* name, State* state, int argc, Expr* argv[]) {
int i;
for (i = 0; i < argc; ++i) {
char* v = Evaluate(state, argv[i]);
@ -154,48 +181,44 @@ char* StdoutFn(const char* name, State* state, int argc, Expr* argv[]) {
fputs(v, stdout);
free(v);
}
return strdup("");
return StringValue(strdup(""));
}
char* LogicalAndFn(const char* name, State* state,
Value* LogicalAndFn(const char* name, State* state,
int argc, Expr* argv[]) {
char* left = Evaluate(state, argv[0]);
if (left == NULL) return NULL;
if (BooleanString(left) == true) {
free(left);
return Evaluate(state, argv[1]);
return EvaluateValue(state, argv[1]);
} else {
return left;
return StringValue(left);
}
}
char* LogicalOrFn(const char* name, State* state,
int argc, Expr* argv[]) {
Value* LogicalOrFn(const char* name, State* state,
int argc, Expr* argv[]) {
char* left = Evaluate(state, argv[0]);
if (left == NULL) return NULL;
if (BooleanString(left) == false) {
free(left);
return Evaluate(state, argv[1]);
return EvaluateValue(state, argv[1]);
} else {
return left;
return StringValue(left);
}
}
char* LogicalNotFn(const char* name, State* state,
int argc, Expr* argv[]) {
Value* LogicalNotFn(const char* name, State* state,
int argc, Expr* argv[]) {
char* val = Evaluate(state, argv[0]);
if (val == NULL) return NULL;
bool bv = BooleanString(val);
free(val);
if (bv) {
return strdup("");
} else {
return strdup("t");
}
return StringValue(strdup(bv ? "" : "t"));
}
char* SubstringFn(const char* name, State* state,
int argc, Expr* argv[]) {
Value* SubstringFn(const char* name, State* state,
int argc, Expr* argv[]) {
char* needle = Evaluate(state, argv[0]);
if (needle == NULL) return NULL;
char* haystack = Evaluate(state, argv[1]);
@ -207,10 +230,10 @@ char* SubstringFn(const char* name, State* state,
char* result = strdup(strstr(haystack, needle) ? "t" : "");
free(needle);
free(haystack);
return result;
return StringValue(result);
}
char* EqualityFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* EqualityFn(const char* name, State* state, int argc, Expr* argv[]) {
char* left = Evaluate(state, argv[0]);
if (left == NULL) return NULL;
char* right = Evaluate(state, argv[1]);
@ -222,10 +245,10 @@ char* EqualityFn(const char* name, State* state, int argc, Expr* argv[]) {
char* result = strdup(strcmp(left, right) == 0 ? "t" : "");
free(left);
free(right);
return result;
return StringValue(result);
}
char* InequalityFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* InequalityFn(const char* name, State* state, int argc, Expr* argv[]) {
char* left = Evaluate(state, argv[0]);
if (left == NULL) return NULL;
char* right = Evaluate(state, argv[1]);
@ -237,17 +260,17 @@ char* InequalityFn(const char* name, State* state, int argc, Expr* argv[]) {
char* result = strdup(strcmp(left, right) != 0 ? "t" : "");
free(left);
free(right);
return result;
return StringValue(result);
}
char* SequenceFn(const char* name, State* state, int argc, Expr* argv[]) {
char* left = Evaluate(state, argv[0]);
Value* SequenceFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* left = EvaluateValue(state, argv[0]);
if (left == NULL) return NULL;
free(left);
return Evaluate(state, argv[1]);
FreeValue(left);
return EvaluateValue(state, argv[1]);
}
char* LessThanIntFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* LessThanIntFn(const char* name, State* state, int argc, Expr* argv[]) {
if (argc != 2) {
free(state->errmsg);
state->errmsg = strdup("less_than_int expects 2 arguments");
@ -278,10 +301,11 @@ char* LessThanIntFn(const char* name, State* state, int argc, Expr* argv[]) {
done:
free(left);
free(right);
return strdup(result ? "t" : "");
return StringValue(strdup(result ? "t" : ""));
}
char* GreaterThanIntFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* GreaterThanIntFn(const char* name, State* state,
int argc, Expr* argv[]) {
if (argc != 2) {
free(state->errmsg);
state->errmsg = strdup("greater_than_int expects 2 arguments");
@ -295,8 +319,8 @@ char* GreaterThanIntFn(const char* name, State* state, int argc, Expr* argv[]) {
return LessThanIntFn(name, state, 2, temp);
}
char* Literal(const char* name, State* state, int argc, Expr* argv[]) {
return strdup(name);
Value* Literal(const char* name, State* state, int argc, Expr* argv[]) {
return StringValue(strdup(name));
}
Expr* Build(Function fn, YYLTYPE loc, int count, ...) {
@ -400,6 +424,32 @@ int ReadArgs(State* state, Expr* argv[], int count, ...) {
return 0;
}
// Evaluate the expressions in argv, giving 'count' Value* (the ... is
// zero or more Value** to put them in). If any expression evaluates
// to NULL, free the rest and return -1. Return 0 on success.
int ReadValueArgs(State* state, Expr* argv[], int count, ...) {
Value** args = malloc(count * sizeof(Value*));
va_list v;
va_start(v, count);
int i;
for (i = 0; i < count; ++i) {
args[i] = EvaluateValue(state, argv[i]);
if (args[i] == NULL) {
va_end(v);
int j;
for (j = 0; j < i; ++j) {
FreeValue(args[j]);
}
free(args);
return -1;
}
*(va_arg(v, Value**)) = args[i];
}
va_end(v);
free(args);
return 0;
}
// Evaluate the expressions in argv, returning an array of char*
// results. If any evaluate to NULL, free the rest and return NULL.
// The caller is responsible for freeing the returned array and the
@ -421,9 +471,30 @@ char** ReadVarArgs(State* state, int argc, Expr* argv[]) {
return args;
}
// Evaluate the expressions in argv, returning an array of Value*
// results. If any evaluate to NULL, free the rest and return NULL.
// The caller is responsible for freeing the returned array and the
// Values it contains.
Value** ReadValueVarArgs(State* state, int argc, Expr* argv[]) {
Value** args = (Value**)malloc(argc * sizeof(Value*));
int i = 0;
for (i = 0; i < argc; ++i) {
args[i] = EvaluateValue(state, argv[i]);
if (args[i] == NULL) {
int j;
for (j = 0; j < i; ++j) {
FreeValue(args[j]);
}
free(args);
return NULL;
}
}
return args;
}
// Use printf-style arguments to compose an error message to put into
// *state. Returns NULL.
char* ErrorAbort(State* state, char* format, ...) {
Value* ErrorAbort(State* state, char* format, ...) {
char* buffer = malloc(4096);
va_list v;
va_start(v, format);

65
edify/expr.h
View File

@ -39,8 +39,17 @@ typedef struct {
char* errmsg;
} State;
typedef char* (*Function)(const char* name, State* state,
int argc, Expr* argv[]);
#define VAL_STRING 1 // data will be NULL-terminated; size doesn't count null
#define VAL_BLOB 2
typedef struct {
int type;
ssize_t size;
char* data;
} Value;
typedef Value* (*Function)(const char* name, State* state,
int argc, Expr* argv[]);
struct Expr {
Function fn;
@ -50,31 +59,41 @@ struct Expr {
int start, end;
};
// Take one of the Expr*s passed to the function as an argument,
// evaluate it, return the resulting Value. The caller takes
// ownership of the returned Value.
Value* EvaluateValue(State* state, Expr* expr);
// Take one of the Expr*s passed to the function as an argument,
// evaluate it, assert that it is a string, and return the resulting
// char*. The caller takes ownership of the returned char*. This is
// a convenience function for older functions that want to deal only
// with strings.
char* Evaluate(State* state, Expr* expr);
// Glue to make an Expr out of a literal.
char* Literal(const char* name, State* state, int argc, Expr* argv[]);
Value* Literal(const char* name, State* state, int argc, Expr* argv[]);
// Functions corresponding to various syntactic sugar operators.
// ("concat" is also available as a builtin function, to concatenate
// more than two strings.)
char* ConcatFn(const char* name, State* state, int argc, Expr* argv[]);
char* LogicalAndFn(const char* name, State* state, int argc, Expr* argv[]);
char* LogicalOrFn(const char* name, State* state, int argc, Expr* argv[]);
char* LogicalNotFn(const char* name, State* state, int argc, Expr* argv[]);
char* SubstringFn(const char* name, State* state, int argc, Expr* argv[]);
char* EqualityFn(const char* name, State* state, int argc, Expr* argv[]);
char* InequalityFn(const char* name, State* state, int argc, Expr* argv[]);
char* SequenceFn(const char* name, State* state, int argc, Expr* argv[]);
Value* ConcatFn(const char* name, State* state, int argc, Expr* argv[]);
Value* LogicalAndFn(const char* name, State* state, int argc, Expr* argv[]);
Value* LogicalOrFn(const char* name, State* state, int argc, Expr* argv[]);
Value* LogicalNotFn(const char* name, State* state, int argc, Expr* argv[]);
Value* SubstringFn(const char* name, State* state, int argc, Expr* argv[]);
Value* EqualityFn(const char* name, State* state, int argc, Expr* argv[]);
Value* InequalityFn(const char* name, State* state, int argc, Expr* argv[]);
Value* SequenceFn(const char* name, State* state, int argc, Expr* argv[]);
// Convenience function for building expressions with a fixed number
// of arguments.
Expr* Build(Function fn, YYLTYPE loc, int count, ...);
// Global builtins, registered by RegisterBuiltins().
char* IfElseFn(const char* name, State* state, int argc, Expr* argv[]);
char* AssertFn(const char* name, State* state, int argc, Expr* argv[]);
char* AbortFn(const char* name, State* state, int argc, Expr* argv[]);
Value* IfElseFn(const char* name, State* state, int argc, Expr* argv[]);
Value* AssertFn(const char* name, State* state, int argc, Expr* argv[]);
Value* AbortFn(const char* name, State* state, int argc, Expr* argv[]);
// For setting and getting the global error string (when returning
@ -112,15 +131,31 @@ Function FindFunction(const char* name);
// to NULL, free the rest and return -1. Return 0 on success.
int ReadArgs(State* state, Expr* argv[], int count, ...);
// Evaluate the expressions in argv, giving 'count' Value* (the ... is
// zero or more Value** to put them in). If any expression evaluates
// to NULL, free the rest and return -1. Return 0 on success.
int ReadValueArgs(State* state, Expr* argv[], int count, ...);
// Evaluate the expressions in argv, returning an array of char*
// results. If any evaluate to NULL, free the rest and return NULL.
// The caller is responsible for freeing the returned array and the
// strings it contains.
char** ReadVarArgs(State* state, int argc, Expr* argv[]);
// Evaluate the expressions in argv, returning an array of Value*
// results. If any evaluate to NULL, free the rest and return NULL.
// The caller is responsible for freeing the returned array and the
// Values it contains.
Value** ReadValueVarArgs(State* state, int argc, Expr* argv[]);
// Use printf-style arguments to compose an error message to put into
// *state. Returns NULL.
char* ErrorAbort(State* state, char* format, ...);
Value* ErrorAbort(State* state, char* format, ...);
// Wrap a string into a Value, taking ownership of the string.
Value* StringValue(char* str);
// Free a Value object.
void FreeValue(Value* v);
#endif // _EXPRESSION_H

236
updater/install.c
View File

@ -29,17 +29,18 @@
#include "cutils/misc.h"
#include "cutils/properties.h"
#include "edify/expr.h"
#include "mincrypt/sha.h"
#include "minzip/DirUtil.h"
#include "mtdutils/mounts.h"
#include "mtdutils/mtdutils.h"
#include "updater.h"
#include "applypatch/applypatch.h"
// mount(type, location, mount_point)
//
// what: type="MTD" location="<partition>" to mount a yaffs2 filesystem
// type="vfat" location="/dev/block/<whatever>" to mount a device
char* MountFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* MountFn(const char* name, State* state, int argc, Expr* argv[]) {
char* result = NULL;
if (argc != 3) {
return ErrorAbort(state, "%s() expects 3 args, got %d", name, argc);
@ -98,12 +99,12 @@ done:
free(type);
free(location);
if (result != mount_point) free(mount_point);
return result;
return StringValue(result);
}
// is_mounted(mount_point)
char* IsMountedFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* IsMountedFn(const char* name, State* state, int argc, Expr* argv[]) {
char* result = NULL;
if (argc != 1) {
return ErrorAbort(state, "%s() expects 1 arg, got %d", name, argc);
@ -127,11 +128,11 @@ char* IsMountedFn(const char* name, State* state, int argc, Expr* argv[]) {
done:
if (result != mount_point) free(mount_point);
return result;
return StringValue(result);
}
char* UnmountFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* UnmountFn(const char* name, State* state, int argc, Expr* argv[]) {
char* result = NULL;
if (argc != 1) {
return ErrorAbort(state, "%s() expects 1 arg, got %d", name, argc);
@ -157,14 +158,14 @@ char* UnmountFn(const char* name, State* state, int argc, Expr* argv[]) {
done:
if (result != mount_point) free(mount_point);
return result;
return StringValue(result);
}
// format(type, location)
//
// type="MTD" location=partition
char* FormatFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* FormatFn(const char* name, State* state, int argc, Expr* argv[]) {
char* result = NULL;
if (argc != 2) {
return ErrorAbort(state, "%s() expects 2 args, got %d", name, argc);
@ -218,11 +219,11 @@ char* FormatFn(const char* name, State* state, int argc, Expr* argv[]) {
done:
free(type);
if (result != location) free(location);
return result;
return StringValue(result);
}
char* DeleteFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* DeleteFn(const char* name, State* state, int argc, Expr* argv[]) {
char** paths = malloc(argc * sizeof(char*));
int i;
for (i = 0; i < argc; ++i) {
@ -249,11 +250,11 @@ char* DeleteFn(const char* name, State* state, int argc, Expr* argv[]) {
char buffer[10];
sprintf(buffer, "%d", success);
return strdup(buffer);
return StringValue(strdup(buffer));
}
char* ShowProgressFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* ShowProgressFn(const char* name, State* state, int argc, Expr* argv[]) {
if (argc != 2) {
return ErrorAbort(state, "%s() expects 2 args, got %d", name, argc);
}
@ -270,10 +271,10 @@ char* ShowProgressFn(const char* name, State* state, int argc, Expr* argv[]) {
fprintf(ui->cmd_pipe, "progress %f %d\n", frac, sec);
free(sec_str);
return frac_str;
return StringValue(frac_str);
}
char* SetProgressFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* SetProgressFn(const char* name, State* state, int argc, Expr* argv[]) {
if (argc != 1) {
return ErrorAbort(state, "%s() expects 1 arg, got %d", name, argc);
}
@ -287,11 +288,11 @@ char* SetProgressFn(const char* name, State* state, int argc, Expr* argv[]) {
UpdaterInfo* ui = (UpdaterInfo*)(state->cookie);
fprintf(ui->cmd_pipe, "set_progress %f\n", frac);
return frac_str;
return StringValue(frac_str);
}
// package_extract_dir(package_path, destination_path)
char* PackageExtractDirFn(const char* name, State* state,
Value* PackageExtractDirFn(const char* name, State* state,
int argc, Expr* argv[]) {
if (argc != 2) {
return ErrorAbort(state, "%s() expects 2 args, got %d", name, argc);
@ -310,7 +311,7 @@ char* PackageExtractDirFn(const char* name, State* state,
NULL, NULL);
free(zip_path);
free(dest_path);
return strdup(success ? "t" : "");
return StringValue(strdup(success ? "t" : ""));
}
@ -318,9 +319,8 @@ char* PackageExtractDirFn(const char* name, State* state,
// or
// package_extract_file(package_path)
// to return the entire contents of the file as the result of this
// function (the char* returned points to a long giving the length
// followed by that many bytes of data).
char* PackageExtractFileFn(const char* name, State* state,
// function (the char* returned is actually a FileContents*).
Value* PackageExtractFileFn(const char* name, State* state,
int argc, Expr* argv[]) {
if (argc != 1 && argc != 2) {
return ErrorAbort(state, "%s() expects 1 or 2 args, got %d",
@ -353,13 +353,16 @@ char* PackageExtractFileFn(const char* name, State* state,
done2:
free(zip_path);
free(dest_path);
return strdup(success ? "t" : "");
return StringValue(strdup(success ? "t" : ""));
} else {
// The one-argument version returns the contents of the file
// as the result.
char* zip_path;
char* buffer = NULL;
Value* v = malloc(sizeof(Value));
v->type = VAL_BLOB;
v->size = -1;
v->data = NULL;
if (ReadArgs(state, argv, 1, &zip_path) < 0) return NULL;
@ -370,33 +373,32 @@ char* PackageExtractFileFn(const char* name, State* state,
goto done1;
}
long size = mzGetZipEntryUncompLen(entry);
buffer = malloc(size + sizeof(long));
if (buffer == NULL) {
v->size = mzGetZipEntryUncompLen(entry);
v->data = malloc(v->size);
if (v->data == NULL) {
fprintf(stderr, "%s: failed to allocate %ld bytes for %s\n",
name, size+sizeof(long), zip_path);
name, (long)v->size, zip_path);
goto done1;
}
*(long *)buffer = size;
success = mzExtractZipEntryToBuffer(
za, entry, (unsigned char *)(buffer + sizeof(long)));
success = mzExtractZipEntryToBuffer(za, entry,
(unsigned char *)v->data);
done1:
free(zip_path);
if (!success) {
free(buffer);
buffer = malloc(sizeof(long));
*(long *)buffer = -1L;
free(v->data);
v->data = NULL;
v->size = -1;
}
return buffer;
return v;
}
}
// symlink target src1 src2 ...
// unlinks any previously existing src1, src2, etc before creating symlinks.
char* SymlinkFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* SymlinkFn(const char* name, State* state, int argc, Expr* argv[]) {
if (argc == 0) {
return ErrorAbort(state, "%s() expects 1+ args, got %d", name, argc);
}
@ -425,11 +427,11 @@ char* SymlinkFn(const char* name, State* state, int argc, Expr* argv[]) {
free(srcs[i]);
}
free(srcs);
return strdup("");
return StringValue(strdup(""));
}
char* SetPermFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* SetPermFn(const char* name, State* state, int argc, Expr* argv[]) {
char* result = NULL;
bool recursive = (strcmp(name, "set_perm_recursive") == 0);
@ -499,11 +501,11 @@ done:
}
free(args);
return result;
return StringValue(result);
}
char* GetPropFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* GetPropFn(const char* name, State* state, int argc, Expr* argv[]) {
if (argc != 1) {
return ErrorAbort(state, "%s() expects 1 arg, got %d", name, argc);
}
@ -515,7 +517,7 @@ char* GetPropFn(const char* name, State* state, int argc, Expr* argv[]) {
property_get(key, value, "");
free(key);
return strdup(value);
return StringValue(strdup(value));
}
@ -524,7 +526,7 @@ char* GetPropFn(const char* name, State* state, int argc, Expr* argv[]) {
// interprets 'file' as a getprop-style file (key=value pairs, one
// per line, # comment lines and blank lines okay), and returns the value
// for 'key' (or "" if it isn't defined).
char* FileGetPropFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* FileGetPropFn(const char* name, State* state, int argc, Expr* argv[]) {
char* result = NULL;
char* buffer = NULL;
char* filename;
@ -614,7 +616,7 @@ char* FileGetPropFn(const char* name, State* state, int argc, Expr* argv[]) {
free(filename);
free(key);
free(buffer);
return result;
return StringValue(result);
}
@ -627,7 +629,7 @@ static bool write_raw_image_cb(const unsigned char* data,
}
// write_raw_image(file, partition)
char* WriteRawImageFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* WriteRawImageFn(const char* name, State* state, int argc, Expr* argv[]) {
char* result = NULL;
char* partition;
@ -700,15 +702,13 @@ char* WriteRawImageFn(const char* name, State* state, int argc, Expr* argv[]) {
done:
if (result != partition) free(partition);
free(filename);
return result;
return StringValue(result);
}
extern int applypatch(int argc, char** argv);
// apply_patch(srcfile, tgtfile, tgtsha1, tgtsize, sha1:patch, ...)
// apply_patch_check(file, sha1, ...)
// apply_patch_space(bytes)
char* ApplyPatchFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* ApplyPatchFn(const char* name, State* state, int argc, Expr* argv[]) {
printf("in applypatchfn (%s)\n", name);
char* prepend = NULL;
@ -747,13 +747,13 @@ char* ApplyPatchFn(const char* name, State* state, int argc, Expr* argv[]) {
free(args);
switch (result) {
case 0: return strdup("t");
case 1: return strdup("");
case 0: return StringValue(strdup("t"));
case 1: return StringValue(strdup(""));
default: return ErrorAbort(state, "applypatch couldn't parse args");
}
}
char* UIPrintFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* UIPrintFn(const char* name, State* state, int argc, Expr* argv[]) {
char** args = ReadVarArgs(state, argc, argv);
if (args == NULL) {
return NULL;
@ -782,10 +782,10 @@ char* UIPrintFn(const char* name, State* state, int argc, Expr* argv[]) {
}
fprintf(((UpdaterInfo*)(state->cookie))->cmd_pipe, "ui_print\n");
return buffer;
return StringValue(buffer);
}
char* RunProgramFn(const char* name, State* state, int argc, Expr* argv[]) {
Value* RunProgramFn(const char* name, State* state, int argc, Expr* argv[]) {
if (argc < 1) {
return ErrorAbort(state, "%s() expects at least 1 arg", name);
}
@ -828,9 +828,138 @@ char* RunProgramFn(const char* name, State* state, int argc, Expr* argv[]) {
char buffer[20];
sprintf(buffer, "%d", status);
return strdup(buffer);
return StringValue(strdup(buffer));
}
// 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.
static 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;
}
// Take a sha-1 digest and return it as a newly-allocated hex string.
static char* PrintSha1(uint8_t* digest) {
char* buffer = malloc(SHA_DIGEST_SIZE*2 + 1);
int i;
const char* alphabet = "0123456789abcdef";
for (i = 0; i < SHA_DIGEST_SIZE; ++i) {
buffer[i*2] = alphabet[(digest[i] >> 4) & 0xf];
buffer[i*2+1] = alphabet[digest[i] & 0xf];
}
buffer[i*2] = '\0';
return buffer;
}
// sha1_check(data)
// to return the sha1 of the data (given in the format returned by
// read_file).
//
// sha1_check(data, sha1_hex, [sha1_hex, ...])
// returns the sha1 of the file if it matches any of the hex
// strings passed, or "" if it does not equal any of them.
//
Value* Sha1CheckFn(const char* name, State* state, int argc, Expr* argv[]) {
if (argc < 1) {
return ErrorAbort(state, "%s() expects at least 1 arg", name);
}
Value** args = ReadValueVarArgs(state, argc, argv);
if (args == NULL) {
return NULL;
}
if (args[0]->size < 0) {
fprintf(stderr, "%s(): no file contents received", name);
return StringValue(strdup(""));
}
uint8_t digest[SHA_DIGEST_SIZE];
SHA(args[0]->data, args[0]->size, digest);
FreeValue(args[0]);
if (argc == 1) {
return StringValue(PrintSha1(digest));
}
int i;
uint8_t* arg_digest = malloc(SHA_DIGEST_SIZE);
for (i = 1; i < argc; ++i) {
if (args[i]->type != VAL_STRING) {
fprintf(stderr, "%s(): arg %d is not a string; skipping",
name, i);
} else if (ParseSha1(args[i]->data, arg_digest) != 0) {
// Warn about bad args and skip them.
fprintf(stderr, "%s(): error parsing \"%s\" as sha-1; skipping",
name, args[i]->data);
} else if (memcmp(digest, arg_digest, SHA_DIGEST_SIZE) == 0) {
break;
}
FreeValue(args[i]);
}
if (i >= argc) {
// Didn't match any of the hex strings; return false.
return StringValue(strdup(""));
}
// Found a match; free all the remaining arguments and return the
// matched one.
int j;
for (j = i+1; j < argc; ++j) {
FreeValue(args[j]);
}
return args[i];
}
// Read a local file and return its contents (the char* returned
// is actually a FileContents*).
Value* ReadFileFn(const char* name, State* state, int argc, Expr* argv[]) {
if (argc != 1) {
return ErrorAbort(state, "%s() expects 1 arg, got %d", name, argc);
}
char* filename;
if (ReadArgs(state, argv, 1, &filename) < 0) return NULL;
Value* v = malloc(sizeof(Value));
v->type = VAL_BLOB;
FileContents fc;
if (LoadFileContents(filename, &fc) != 0) {
ErrorAbort(state, "%s() loading \"%s\" failed: %s",
name, filename, strerror(errno));
free(filename);
free(v);
free(fc.data);
return NULL;
}
v->size = fc.size;
v->data = (char*)fc.data;
free(filename);
return v;
}
void RegisterInstallFunctions() {
RegisterFunction("mount", MountFn);
@ -855,6 +984,9 @@ void RegisterInstallFunctions() {
RegisterFunction("apply_patch_check", ApplyPatchFn);
RegisterFunction("apply_patch_space", ApplyPatchFn);
RegisterFunction("read_file", ReadFileFn);
RegisterFunction("sha1_check", Sha1CheckFn);
RegisterFunction("ui_print", UIPrintFn);
RegisterFunction("run_program", RunProgramFn);

6
updater/updater.c
View File

@ -33,6 +33,12 @@
#define SCRIPT_NAME "META-INF/com/google/android/updater-script"
int main(int argc, char** argv) {
// Various things log information to stdout or stderr more or less
// at random. The log file makes more sense if buffering is
// turned off so things appear in the right order.
setbuf(stdout, NULL);
setbuf(stderr, NULL);
if (argc != 4) {
fprintf(stderr, "unexpected number of arguments (%d)\n", argc);
return 1;