upload android base code part3

android/bootable/recovery/otautil/Android.bp

@@ -0,0 +1,33 @@
+// 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.
+
+cc_library_static {
+    name: "libotautil",
+
+    srcs: [
+        "SysUtil.cpp",
+        "DirUtil.cpp",
+        "ThermalUtil.cpp",
+    ],
+
+    static_libs: [
+        "libselinux",
+        "libbase",
+    ],
+
+    cflags: [
+        "-Werror",
+        "-Wall",
+    ],
+}

android/bootable/recovery/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);
+}

android/bootable/recovery/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_

android/bootable/recovery/otautil/SysUtil.cpp

@@ -0,0 +1,202 @@
+/*
+ * Copyright 2006 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 "SysUtil.h"
+
+#include <fcntl.h>
+#include <stdint.h>  // SIZE_MAX
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <string>
+#include <vector>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/strings.h>
+#include <android-base/unique_fd.h>
+
+bool MemMapping::MapFD(int fd) {
+  struct stat sb;
+  if (fstat(fd, &sb) == -1) {
+    PLOG(ERROR) << "fstat(" << fd << ") failed";
+    return false;
+  }
+
+  void* memPtr = mmap(nullptr, 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;
+  }
+
+  addr = static_cast<unsigned char*>(memPtr);
+  length = sb.st_size;
+  ranges_.clear();
+  ranges_.emplace_back(MappedRange{ memPtr, static_cast<size_t>(sb.st_size) });
+
+  return true;
+}
+
+// A "block map" which looks like this (from uncrypt/uncrypt.cpp):
+//
+//   /dev/block/platform/msm_sdcc.1/by-name/userdata     # block device
+//   49652 4096                                          # file size in bytes, block size
+//   3                                                   # count of block ranges
+//   1000 1008                                           # block range 0
+//   2100 2102                                           # ... block range 1
+//   30 33                                               # ... block range 2
+//
+// Each block range represents a half-open interval; the line "30 33" reprents the blocks
+// [30, 31, 32].
+bool MemMapping::MapBlockFile(const std::string& filename) {
+  std::string content;
+  if (!android::base::ReadFileToString(filename, &content)) {
+    PLOG(ERROR) << "Failed to read " << filename;
+    return false;
+  }
+
+  std::vector<std::string> lines = android::base::Split(android::base::Trim(content), "\n");
+  if (lines.size() < 4) {
+    LOG(ERROR) << "Block map file is too short: " << lines.size();
+    return false;
+  }
+
+  size_t size;
+  size_t blksize;
+  if (sscanf(lines[1].c_str(), "%zu %zu", &size, &blksize) != 2) {
+    LOG(ERROR) << "Failed to parse file size and block size: " << lines[1];
+    return false;
+  }
+
+  size_t range_count;
+  if (sscanf(lines[2].c_str(), "%zu", &range_count) != 1) {
+    LOG(ERROR) << "Failed to parse block map header: " << lines[2];
+    return false;
+  }
+
+  size_t blocks;
+  if (blksize != 0) {
+    blocks = ((size - 1) / blksize) + 1;
+  }
+  if (size == 0 || blksize == 0 || blocks > SIZE_MAX / blksize || range_count == 0 ||
+      lines.size() != 3 + range_count) {
+    LOG(ERROR) << "Invalid data in block map file: size " << size << ", blksize " << blksize
+               << ", range_count " << range_count << ", lines " << lines.size();
+    return false;
+  }
+
+  // Reserve enough contiguous address space for the whole file.
+  void* reserve = mmap64(nullptr, blocks * blksize, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0);
+  if (reserve == MAP_FAILED) {
+    PLOG(ERROR) << "failed to reserve address space";
+    return false;
+  }
+
+  const std::string& block_dev = lines[0];
+  android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(block_dev.c_str(), O_RDONLY)));
+  if (fd == -1) {
+    PLOG(ERROR) << "failed to open block device " << block_dev;
+    munmap(reserve, blocks * blksize);
+    return false;
+  }
+
+  ranges_.clear();
+
+  unsigned char* next = static_cast<unsigned char*>(reserve);
+  size_t remaining_size = blocks * blksize;
+  bool success = true;
+  for (size_t i = 0; i < range_count; ++i) {
+    const std::string& line = lines[i + 3];
+
+    size_t start, end;
+    if (sscanf(line.c_str(), "%zu %zu\n", &start, &end) != 2) {
+      LOG(ERROR) << "failed to parse range " << i << ": " << line;
+      success = false;
+      break;
+    }
+    size_t range_size = (end - start) * blksize;
+    if (end <= start || (end - start) > SIZE_MAX / blksize || range_size > remaining_size) {
+      LOG(ERROR) << "Invalid range: " << start << " " << end;
+      success = false;
+      break;
+    }
+
+    void* range_start = mmap64(next, range_size, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd,
+                               static_cast<off64_t>(start) * blksize);
+    if (range_start == MAP_FAILED) {
+      PLOG(ERROR) << "failed to map range " << i << ": " << line;
+      success = false;
+      break;
+    }
+    ranges_.emplace_back(MappedRange{ range_start, range_size });
+
+    next += range_size;
+    remaining_size -= range_size;
+  }
+  if (success && remaining_size != 0) {
+    LOG(ERROR) << "Invalid ranges: remaining_size " << remaining_size;
+    success = false;
+  }
+  if (!success) {
+    munmap(reserve, blocks * blksize);
+    return false;
+  }
+
+  addr = static_cast<unsigned char*>(reserve);
+  length = size;
+
+  LOG(INFO) << "mmapped " << range_count << " ranges";
+
+  return true;
+}
+
+bool MemMapping::MapFile(const std::string& fn) {
+  if (fn.empty()) {
+    LOG(ERROR) << "Empty filename";
+    return false;
+  }
+
+  if (fn[0] == '@') {
+    // Block map file "@/cache/recovery/block.map".
+    if (!MapBlockFile(fn.substr(1))) {
+      LOG(ERROR) << "Map of '" << fn << "' failed";
+      return false;
+    }
+  } else {
+    // This is a regular file.
+    android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(fn.c_str(), O_RDONLY)));
+    if (fd == -1) {
+      PLOG(ERROR) << "Unable to open '" << fn << "'";
+      return false;
+    }
+
+    if (!MapFD(fd)) {
+      LOG(ERROR) << "Map of '" << fn << "' failed";
+      return false;
+    }
+  }
+  return true;
+}
+
+MemMapping::~MemMapping() {
+  for (const auto& range : ranges_) {
+    if (munmap(range.addr, range.length) == -1) {
+      PLOG(ERROR) << "Failed to munmap(" << range.addr << ", " << range.length << ")";
+    }
+  };
+  ranges_.clear();
+}

android/bootable/recovery/otautil/SysUtil.h

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2006 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_SYSUTIL
+#define _OTAUTIL_SYSUTIL
+
+#include <sys/types.h>
+
+#include <string>
+#include <vector>
+
+/*
+ * Use this to keep track of mapped segments.
+ */
+class MemMapping {
+ public:
+  ~MemMapping();
+  // Map a file into a private, read-only memory segment. If 'filename' begins with an '@'
+  // character, it is a map of blocks to be mapped, otherwise it is treated as an ordinary file.
+  bool MapFile(const std::string& filename);
+  size_t ranges() const {
+    return ranges_.size();
+  };
+
+  unsigned char* addr;  // start of data
+  size_t length;        // length of data
+
+ private:
+  struct MappedRange {
+    void* addr;
+    size_t length;
+  };
+
+  bool MapBlockFile(const std::string& filename);
+  bool MapFD(int fd);
+
+  std::vector<MappedRange> ranges_;
+};
+
+#endif  // _OTAUTIL_SYSUTIL

android/bootable/recovery/otautil/ThermalUtil.cpp

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2017 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 "ThermalUtil.h"
+
+#include <dirent.h>
+#include <stdio.h>
+
+#include <algorithm>
+#include <string>
+#include <vector>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/parseint.h>
+#include <android-base/strings.h>
+
+static constexpr auto THERMAL_PREFIX = "/sys/class/thermal/";
+
+static int thermal_filter(const dirent* de) {
+  if (android::base::StartsWith(de->d_name, "thermal_zone")) {
+    return 1;
+  }
+  return 0;
+}
+
+static std::vector<std::string> InitThermalPaths() {
+  dirent** namelist;
+  int n = scandir(THERMAL_PREFIX, &namelist, thermal_filter, alphasort);
+  if (n == -1) {
+    PLOG(ERROR) << "Failed to scandir " << THERMAL_PREFIX;
+    return {};
+  }
+  if (n == 0) {
+    LOG(ERROR) << "Failed to find CPU thermal info in " << THERMAL_PREFIX;
+    return {};
+  }
+
+  std::vector<std::string> thermal_paths;
+  while (n--) {
+    thermal_paths.push_back(THERMAL_PREFIX + std::string(namelist[n]->d_name) + "/temp");
+    free(namelist[n]);
+  }
+  free(namelist);
+  return thermal_paths;
+}
+
+int GetMaxValueFromThermalZone() {
+  static std::vector<std::string> thermal_paths = InitThermalPaths();
+  int max_temperature = -1;
+  for (const auto& path : thermal_paths) {
+    std::string content;
+    if (!android::base::ReadFileToString(path, &content)) {
+      PLOG(WARNING) << "Failed to read " << path;
+      continue;
+    }
+
+    int temperature;
+    if (!android::base::ParseInt(android::base::Trim(content), &temperature)) {
+      LOG(WARNING) << "Failed to parse integer in " << content;
+      continue;
+    }
+    max_temperature = std::max(temperature, max_temperature);
+  }
+  LOG(INFO) << "current maximum temperature: " << max_temperature;
+  return max_temperature;
+}

android/bootable/recovery/otautil/ThermalUtil.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2017 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_THERMALUTIL_H
+#define OTAUTIL_THERMALUTIL_H
+
+// We can find the temperature reported by all sensors in /sys/class/thermal/thermal_zone*/temp.
+// Their values are in millidegree Celsius; and we will log the maximum one.
+int GetMaxValueFromThermalZone();
+
+#endif  // OTAUTIL_THERMALUTIL_H