diff options
Diffstat (limited to 'otautil')
| -rw-r--r-- | otautil/Android.mk | 35 | ||||
| -rw-r--r-- | otautil/DirUtil.cpp | 218 | ||||
| -rw-r--r-- | otautil/DirUtil.h | 54 | ||||
| -rw-r--r-- | otautil/SysUtil.cpp | 212 | ||||
| -rw-r--r-- | otautil/SysUtil.h | 52 | ||||
| -rw-r--r-- | otautil/ZipUtil.cpp | 121 | ||||
| -rw-r--r-- | otautil/ZipUtil.h | 57 |
7 files changed, 749 insertions, 0 deletions
diff --git a/otautil/Android.mk b/otautil/Android.mk new file mode 100644 index 000000000..3acfa533e --- /dev/null +++ b/otautil/Android.mk @@ -0,0 +1,35 @@ +# Copyright (C) 2016 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. + +LOCAL_PATH := $(call my-dir) +include $(CLEAR_VARS) + +LOCAL_SRC_FILES := \ + SysUtil.cpp \ + DirUtil.cpp \ + ZipUtil.cpp + +LOCAL_C_INCLUDES := \ + external/zlib \ + external/safe-iop/include + +LOCAL_STATIC_LIBRARIES := libselinux libbase + +LOCAL_MODULE := libotautil + +LOCAL_CLANG := true + +LOCAL_CFLAGS += -Werror -Wall + +include $(BUILD_STATIC_LIBRARY) diff --git a/otautil/DirUtil.cpp b/otautil/DirUtil.cpp new file mode 100644 index 000000000..e08e360c0 --- /dev/null +++ b/otautil/DirUtil.cpp @@ -0,0 +1,218 @@ +/* + * Copyright (C) 2007 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 "DirUtil.h" + +#include <stdlib.h> +#include <string.h> +#include <stdio.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include <errno.h> +#include <dirent.h> +#include <limits.h> + +#include <string> + +#include <selinux/label.h> +#include <selinux/selinux.h> + +typedef enum { DMISSING, DDIR, DILLEGAL } DirStatus; + +static DirStatus +getPathDirStatus(const char *path) +{ + struct stat st; + int err; + + err = stat(path, &st); + if (err == 0) { + /* Something's there; make sure it's a directory. + */ + if (S_ISDIR(st.st_mode)) { + return DDIR; + } + errno = ENOTDIR; + return DILLEGAL; + } else if (errno != ENOENT) { + /* Something went wrong, or something in the path + * is bad. Can't do anything in this situation. + */ + return DILLEGAL; + } + return DMISSING; +} + +int +dirCreateHierarchy(const char *path, int mode, + const struct utimbuf *timestamp, bool stripFileName, + struct selabel_handle *sehnd) +{ + DirStatus ds; + + /* Check for an empty string before we bother + * making any syscalls. + */ + if (path[0] == '\0') { + errno = ENOENT; + return -1; + } + // Allocate a path that we can modify; stick a slash on + // the end to make things easier. + std::string cpath = path; + if (stripFileName) { + // Strip everything after the last slash. + size_t pos = cpath.rfind('/'); + if (pos == std::string::npos) { + errno = ENOENT; + return -1; + } + cpath.resize(pos + 1); + } else { + // Make sure that the path ends in a slash. + cpath.push_back('/'); + } + + /* See if it already exists. + */ + ds = getPathDirStatus(cpath.c_str()); + if (ds == DDIR) { + return 0; + } else if (ds == DILLEGAL) { + return -1; + } + + /* Walk up the path from the root and make each level. + * If a directory already exists, no big deal. + */ + const char *path_start = &cpath[0]; + char *p = &cpath[0]; + while (*p != '\0') { + /* Skip any slashes, watching out for the end of the string. + */ + while (*p != '\0' && *p == '/') { + p++; + } + if (*p == '\0') { + break; + } + + /* Find the end of the next path component. + * We know that we'll see a slash before the NUL, + * because we added it, above. + */ + while (*p != '/') { + p++; + } + *p = '\0'; + + /* Check this part of the path and make a new directory + * if necessary. + */ + ds = getPathDirStatus(path_start); + if (ds == DILLEGAL) { + /* Could happen if some other process/thread is + * messing with the filesystem. + */ + return -1; + } else if (ds == DMISSING) { + int err; + + char *secontext = NULL; + + if (sehnd) { + selabel_lookup(sehnd, &secontext, path_start, mode); + setfscreatecon(secontext); + } + + err = mkdir(path_start, mode); + + if (secontext) { + freecon(secontext); + setfscreatecon(NULL); + } + + if (err != 0) { + return -1; + } + if (timestamp != NULL && utime(path_start, timestamp)) { + return -1; + } + } + // else, this directory already exists. + + // Repair the path and continue. + *p = '/'; + } + return 0; +} + +int +dirUnlinkHierarchy(const char *path) +{ + struct stat st; + DIR *dir; + struct dirent *de; + int fail = 0; + + /* is it a file or directory? */ + if (lstat(path, &st) < 0) { + return -1; + } + + /* a file, so unlink it */ + if (!S_ISDIR(st.st_mode)) { + return unlink(path); + } + + /* a directory, so open handle */ + dir = opendir(path); + if (dir == NULL) { + return -1; + } + + /* recurse over components */ + errno = 0; + while ((de = readdir(dir)) != NULL) { + //TODO: don't blow the stack + char dn[PATH_MAX]; + if (!strcmp(de->d_name, "..") || !strcmp(de->d_name, ".")) { + continue; + } + snprintf(dn, sizeof(dn), "%s/%s", path, de->d_name); + if (dirUnlinkHierarchy(dn) < 0) { + fail = 1; + break; + } + errno = 0; + } + /* in case readdir or unlink_recursive failed */ + if (fail || errno < 0) { + int save = errno; + closedir(dir); + errno = save; + return -1; + } + + /* close directory handle */ + if (closedir(dir) < 0) { + return -1; + } + + /* delete target directory */ + return rmdir(path); +} diff --git a/otautil/DirUtil.h b/otautil/DirUtil.h new file mode 100644 index 000000000..85b83c387 --- /dev/null +++ b/otautil/DirUtil.h @@ -0,0 +1,54 @@ +/* + * Copyright (C) 2007 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 MINZIP_DIRUTIL_H_ +#define MINZIP_DIRUTIL_H_ + +#include <stdbool.h> +#include <utime.h> + +#ifdef __cplusplus +extern "C" { +#endif + +struct selabel_handle; + +/* Like "mkdir -p", try to guarantee that all directories + * specified in path are present, creating as many directories + * as necessary. The specified mode is passed to all mkdir + * calls; no modifications are made to umask. + * + * If stripFileName is set, everything after the final '/' + * is stripped before creating the directory hierarchy. + * + * If timestamp is non-NULL, new directories will be timestamped accordingly. + * + * Returns 0 on success; returns -1 (and sets errno) on failure + * (usually if some element of path is not a directory). + */ +int dirCreateHierarchy(const char *path, int mode, + const struct utimbuf *timestamp, bool stripFileName, + struct selabel_handle* sehnd); + +/* rm -rf <path> + */ +int dirUnlinkHierarchy(const char *path); + +#ifdef __cplusplus +} +#endif + +#endif // MINZIP_DIRUTIL_H_ diff --git a/otautil/SysUtil.cpp b/otautil/SysUtil.cpp new file mode 100644 index 000000000..2936c5ca4 --- /dev/null +++ b/otautil/SysUtil.cpp @@ -0,0 +1,212 @@ +/* + * Copyright 2006 The Android Open Source Project + * + * System utilities. + */ +#include <assert.h> +#include <errno.h> +#include <fcntl.h> +#include <limits.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/mman.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <unistd.h> + +#include <android-base/logging.h> + +#include "SysUtil.h" + +static bool sysMapFD(int fd, MemMapping* pMap) { + assert(pMap != NULL); + + struct stat sb; + if (fstat(fd, &sb) == -1) { + PLOG(ERROR) << "fstat(" << fd << ") failed"; + return false; + } + + void* memPtr = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0); + if (memPtr == MAP_FAILED) { + PLOG(ERROR) << "mmap(" << sb.st_size << ", R, PRIVATE, " << fd << ", 0) failed"; + return false; + } + + pMap->addr = reinterpret_cast<unsigned char*>(memPtr); + pMap->length = sb.st_size; + pMap->range_count = 1; + pMap->ranges = reinterpret_cast<MappedRange*>(malloc(sizeof(MappedRange))); + if (pMap->ranges == NULL) { + PLOG(ERROR) << "malloc failed"; + munmap(memPtr, sb.st_size); + return false; + } + pMap->ranges[0].addr = memPtr; + pMap->ranges[0].length = sb.st_size; + + return true; +} + +static int sysMapBlockFile(FILE* mapf, MemMapping* pMap) +{ + char block_dev[PATH_MAX+1]; + size_t size; + unsigned int blksize; + size_t blocks; + unsigned int range_count; + unsigned int i; + + if (fgets(block_dev, sizeof(block_dev), mapf) == NULL) { + PLOG(ERROR) << "failed to read block device from header"; + return -1; + } + for (i = 0; i < sizeof(block_dev); ++i) { + if (block_dev[i] == '\n') { + block_dev[i] = 0; + break; + } + } + + if (fscanf(mapf, "%zu %u\n%u\n", &size, &blksize, &range_count) != 3) { + LOG(ERROR) << "failed to parse block map header"; + return -1; + } + if (blksize != 0) { + blocks = ((size-1) / blksize) + 1; + } + if (size == 0 || blksize == 0 || blocks > SIZE_MAX / blksize || range_count == 0) { + LOG(ERROR) << "invalid data in block map file: size " << size << ", blksize " << blksize + << ", range_count " << range_count; + return -1; + } + + pMap->range_count = range_count; + pMap->ranges = reinterpret_cast<MappedRange*>(calloc(range_count, sizeof(MappedRange))); + if (pMap->ranges == NULL) { + PLOG(ERROR) << "calloc(" << range_count << ", " << sizeof(MappedRange) << ") failed"; + return -1; + } + + // Reserve enough contiguous address space for the whole file. + unsigned char* reserve = reinterpret_cast<unsigned char*>(mmap64(NULL, blocks * blksize, + PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0)); + if (reserve == MAP_FAILED) { + PLOG(ERROR) << "failed to reserve address space"; + free(pMap->ranges); + return -1; + } + + int fd = open(block_dev, O_RDONLY); + if (fd < 0) { + PLOG(ERROR) << "failed to open block device " << block_dev; + munmap(reserve, blocks * blksize); + free(pMap->ranges); + return -1; + } + + unsigned char* next = reserve; + size_t remaining_size = blocks * blksize; + bool success = true; + for (i = 0; i < range_count; ++i) { + size_t start, end; + if (fscanf(mapf, "%zu %zu\n", &start, &end) != 2) { + LOG(ERROR) << "failed to parse range " << i << " in block map"; + success = false; + break; + } + size_t length = (end - start) * blksize; + if (end <= start || (end - start) > SIZE_MAX / blksize || length > remaining_size) { + LOG(ERROR) << "unexpected range in block map: " << start << " " << end; + success = false; + break; + } + + void* addr = mmap64(next, length, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, ((off64_t)start)*blksize); + if (addr == MAP_FAILED) { + PLOG(ERROR) << "failed to map block " << i; + success = false; + break; + } + pMap->ranges[i].addr = addr; + pMap->ranges[i].length = length; + + next += length; + remaining_size -= length; + } + if (success && remaining_size != 0) { + LOG(ERROR) << "ranges in block map are invalid: remaining_size = " << remaining_size; + success = false; + } + if (!success) { + close(fd); + munmap(reserve, blocks * blksize); + free(pMap->ranges); + return -1; + } + + close(fd); + pMap->addr = reserve; + pMap->length = size; + + LOG(INFO) << "mmapped " << range_count << " ranges"; + + return 0; +} + +int sysMapFile(const char* fn, MemMapping* pMap) +{ + memset(pMap, 0, sizeof(*pMap)); + + if (fn && fn[0] == '@') { + // A map of blocks + FILE* mapf = fopen(fn+1, "r"); + if (mapf == NULL) { + PLOG(ERROR) << "Unable to open '" << (fn+1) << "'"; + return -1; + } + + if (sysMapBlockFile(mapf, pMap) != 0) { + LOG(ERROR) << "Map of '" << fn << "' failed"; + fclose(mapf); + return -1; + } + + fclose(mapf); + } else { + // This is a regular file. + int fd = open(fn, O_RDONLY); + if (fd == -1) { + PLOG(ERROR) << "Unable to open '" << fn << "'"; + return -1; + } + + if (!sysMapFD(fd, pMap)) { + LOG(ERROR) << "Map of '" << fn << "' failed"; + close(fd); + return -1; + } + + close(fd); + } + return 0; +} + +/* + * Release a memory mapping. + */ +void sysReleaseMap(MemMapping* pMap) +{ + int i; + for (i = 0; i < pMap->range_count; ++i) { + if (munmap(pMap->ranges[i].addr, pMap->ranges[i].length) < 0) { + PLOG(ERROR) << "munmap(" << pMap->ranges[i].addr << ", " << pMap->ranges[i].length + << ") failed"; + } + } + free(pMap->ranges); + pMap->ranges = NULL; + pMap->range_count = 0; +} diff --git a/otautil/SysUtil.h b/otautil/SysUtil.h new file mode 100644 index 000000000..7adff1e54 --- /dev/null +++ b/otautil/SysUtil.h @@ -0,0 +1,52 @@ +/* + * Copyright 2006 The Android Open Source Project + * + * System utilities. + */ +#ifndef _MINZIP_SYSUTIL +#define _MINZIP_SYSUTIL + +#include <stdio.h> +#include <sys/types.h> + +#ifdef __cplusplus +extern "C" { +#endif + +typedef struct MappedRange { + void* addr; + size_t length; +} MappedRange; + +/* + * Use this to keep track of mapped segments. + */ +typedef struct MemMapping { + unsigned char* addr; /* start of data */ + size_t length; /* length of data */ + + int range_count; + MappedRange* ranges; +} MemMapping; + +/* + * Map a file into a private, read-only memory segment. If 'fn' + * begins with an '@' character, it is a map of blocks to be mapped, + * otherwise it is treated as an ordinary file. + * + * On success, "pMap" is filled in, and zero is returned. + */ +int sysMapFile(const char* fn, MemMapping* pMap); + +/* + * Release the pages associated with a shared memory segment. + * + * This does not free "pMap"; it just releases the memory. + */ +void sysReleaseMap(MemMapping* pMap); + +#ifdef __cplusplus +} +#endif + +#endif /*_MINZIP_SYSUTIL*/ diff --git a/otautil/ZipUtil.cpp b/otautil/ZipUtil.cpp new file mode 100644 index 000000000..714c956ed --- /dev/null +++ b/otautil/ZipUtil.cpp @@ -0,0 +1,121 @@ +/* + * Copyright (C) 2016 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 "ZipUtil.h" + +#include <errno.h> +#include <fcntl.h> +#include <utime.h> + +#include <string> + +#include <android-base/logging.h> +#include <android-base/unique_fd.h> +#include <selinux/label.h> +#include <selinux/selinux.h> +#include <ziparchive/zip_archive.h> + +#include "DirUtil.h" + +static constexpr mode_t UNZIP_DIRMODE = 0755; +static constexpr mode_t UNZIP_FILEMODE = 0644; + +bool ExtractPackageRecursive(ZipArchiveHandle zip, const std::string& zip_path, + const std::string& dest_path, const struct utimbuf* timestamp, + struct selabel_handle* sehnd) { + if (!zip_path.empty() && zip_path[0] == '/') { + LOG(ERROR) << "ExtractPackageRecursive(): zip_path must be a relative path " << zip_path; + return false; + } + if (dest_path.empty() || dest_path[0] != '/') { + LOG(ERROR) << "ExtractPackageRecursive(): dest_path must be an absolute path " << dest_path; + return false; + } + + void* cookie; + std::string target_dir(dest_path); + if (dest_path.back() != '/') { + target_dir += '/'; + } + std::string prefix_path(zip_path); + if (!zip_path.empty() && zip_path.back() != '/') { + prefix_path += '/'; + } + const ZipString zip_prefix(prefix_path.c_str()); + + int ret = StartIteration(zip, &cookie, &zip_prefix, nullptr); + if (ret != 0) { + LOG(ERROR) << "failed to start iterating zip entries."; + return false; + } + + std::unique_ptr<void, decltype(&EndIteration)> guard(cookie, EndIteration); + ZipEntry entry; + ZipString name; + int extractCount = 0; + while (Next(cookie, &entry, &name) == 0) { + std::string entry_name(name.name, name.name + name.name_length); + CHECK_LE(prefix_path.size(), entry_name.size()); + std::string path = target_dir + entry_name.substr(prefix_path.size()); + // Skip dir. + if (path.back() == '/') { + continue; + } + //TODO(b/31917448) handle the symlink. + + if (dirCreateHierarchy(path.c_str(), UNZIP_DIRMODE, timestamp, true, sehnd) != 0) { + LOG(ERROR) << "failed to create dir for " << path; + return false; + } + + char *secontext = NULL; + if (sehnd) { + selabel_lookup(sehnd, &secontext, path.c_str(), UNZIP_FILEMODE); + setfscreatecon(secontext); + } + android::base::unique_fd fd(open(path.c_str(), O_CREAT|O_WRONLY|O_TRUNC, UNZIP_FILEMODE)); + if (fd == -1) { + PLOG(ERROR) << "Can't create target file \"" << path << "\""; + return false; + } + if (secontext) { + freecon(secontext); + setfscreatecon(NULL); + } + + int err = ExtractEntryToFile(zip, &entry, fd); + if (err != 0) { + LOG(ERROR) << "Error extracting \"" << path << "\" : " << ErrorCodeString(err); + return false; + } + + if (fsync(fd) != 0) { + PLOG(ERROR) << "Error syncing file descriptor when extracting \"" << path << "\""; + return false; + } + + if (timestamp != nullptr && utime(path.c_str(), timestamp)) { + PLOG(ERROR) << "Error touching \"" << path << "\""; + return false; + } + + LOG(INFO) << "Extracted file \"" << path << "\""; + ++extractCount; + } + + LOG(INFO) << "Extracted " << extractCount << " file(s)"; + return true; +} diff --git a/otautil/ZipUtil.h b/otautil/ZipUtil.h new file mode 100644 index 000000000..cda405c2a --- /dev/null +++ b/otautil/ZipUtil.h @@ -0,0 +1,57 @@ +/* + * Copyright (C) 2016 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 _OTAUTIL_ZIPUTIL_H +#define _OTAUTIL_ZIPUTIL_H + +#include <utime.h> + +#include <string> + +#include <selinux/label.h> +#include <ziparchive/zip_archive.h> + +/* + * Inflate all files under zip_path to the directory specified by + * dest_path, which must exist and be a writable directory. The zip_path + * is allowed to be an empty string, in which case the whole package + * will be extracted. + * + * Directory entries are not extracted. + * + * The immediate children of zip_path will become the immediate + * children of dest_path; e.g., if the archive contains the entries + * + * a/b/c/one + * a/b/c/two + * a/b/c/d/three + * + * and ExtractPackageRecursive(a, "a/b/c", "/tmp", ...) is called, the resulting + * files will be + * + * /tmp/one + * /tmp/two + * /tmp/d/three + * + * If timestamp is non-NULL, file timestamps will be set accordingly. + * + * Returns true on success, false on failure. + */ +bool ExtractPackageRecursive(ZipArchiveHandle zip, const std::string& zip_path, + const std::string& dest_path, const struct utimbuf* timestamp, + struct selabel_handle* sehnd); + +#endif // _OTAUTIL_ZIPUTIL_H |