316 lines
9.3 KiB
C++
316 lines
9.3 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define TRACE_TAG ADB
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#include "adb_utils.h"
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#include "adb_unique_fd.h"
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#include <libgen.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <algorithm>
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#include <mutex>
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#include <vector>
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#include <android-base/logging.h>
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#include <android-base/parseint.h>
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#include <android-base/stringprintf.h>
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#include <android-base/strings.h>
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#include "adb.h"
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#include "adb_trace.h"
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#include "sysdeps.h"
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#ifdef _WIN32
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# ifndef WIN32_LEAN_AND_MEAN
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# define WIN32_LEAN_AND_MEAN
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# endif
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# include "windows.h"
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# include "shlobj.h"
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#else
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#include <pwd.h>
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#endif
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#if defined(_WIN32)
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constexpr char kNullFileName[] = "NUL";
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#else
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constexpr char kNullFileName[] = "/dev/null";
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#endif
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void close_stdin() {
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int fd = unix_open(kNullFileName, O_RDONLY);
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if (fd == -1) {
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fatal_errno("failed to open %s", kNullFileName);
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}
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if (TEMP_FAILURE_RETRY(dup2(fd, STDIN_FILENO)) == -1) {
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fatal_errno("failed to redirect stdin to %s", kNullFileName);
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}
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unix_close(fd);
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}
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bool getcwd(std::string* s) {
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char* cwd = getcwd(nullptr, 0);
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if (cwd != nullptr) *s = cwd;
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free(cwd);
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return (cwd != nullptr);
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}
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bool directory_exists(const std::string& path) {
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struct stat sb;
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return lstat(path.c_str(), &sb) != -1 && S_ISDIR(sb.st_mode);
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}
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std::string escape_arg(const std::string& s) {
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std::string result = s;
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// Escape any ' in the string (before we single-quote the whole thing).
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// The correct way to do this for the shell is to replace ' with '\'' --- that is,
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// close the existing single-quoted string, escape a single single-quote, and start
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// a new single-quoted string. Like the C preprocessor, the shell will concatenate
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// these pieces into one string.
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for (size_t i = 0; i < s.size(); ++i) {
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if (s[i] == '\'') {
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result.insert(i, "'\\'");
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i += 2;
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}
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}
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// Prefix and suffix the whole string with '.
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result.insert(result.begin(), '\'');
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result.push_back('\'');
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return result;
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}
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std::string adb_basename(const std::string& path) {
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static std::mutex& basename_lock = *new std::mutex();
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// Copy path because basename may modify the string passed in.
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std::string result(path);
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// Use lock because basename() may write to a process global and return a
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// pointer to that. Note that this locking strategy only works if all other
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// callers to basename in the process also grab this same lock.
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std::lock_guard<std::mutex> lock(basename_lock);
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// Note that if std::string uses copy-on-write strings, &str[0] will cause
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// the copy to be made, so there is no chance of us accidentally writing to
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// the storage for 'path'.
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char* name = basename(&result[0]);
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// In case dirname returned a pointer to a process global, copy that string
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// before leaving the lock.
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result.assign(name);
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return result;
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}
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std::string adb_dirname(const std::string& path) {
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static std::mutex& dirname_lock = *new std::mutex();
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// Copy path because dirname may modify the string passed in.
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std::string result(path);
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// Use lock because dirname() may write to a process global and return a
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// pointer to that. Note that this locking strategy only works if all other
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// callers to dirname in the process also grab this same lock.
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std::lock_guard<std::mutex> lock(dirname_lock);
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// Note that if std::string uses copy-on-write strings, &str[0] will cause
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// the copy to be made, so there is no chance of us accidentally writing to
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// the storage for 'path'.
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char* parent = dirname(&result[0]);
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// In case dirname returned a pointer to a process global, copy that string
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// before leaving the lock.
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result.assign(parent);
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return result;
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}
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// Given a relative or absolute filepath, create the directory hierarchy
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// as needed. Returns true if the hierarchy is/was setup.
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bool mkdirs(const std::string& path) {
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// TODO: all the callers do unlink && mkdirs && adb_creat ---
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// that's probably the operation we should expose.
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// Implementation Notes:
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//
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// Pros:
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// - Uses dirname, so does not need to deal with OS_PATH_SEPARATOR.
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// - On Windows, uses mingw dirname which accepts '/' and '\\', drive letters
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// (C:\foo), UNC paths (\\server\share\dir\dir\file), and Unicode (when
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// combined with our adb_mkdir() which takes UTF-8).
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// - Is optimistic wrt thinking that a deep directory hierarchy will exist.
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// So it does as few stat()s as possible before doing mkdir()s.
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// Cons:
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// - Recursive, so it uses stack space relative to number of directory
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// components.
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// If path points to a symlink to a directory, that's fine.
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struct stat sb;
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if (stat(path.c_str(), &sb) != -1 && S_ISDIR(sb.st_mode)) {
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return true;
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}
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const std::string parent(adb_dirname(path));
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// If dirname returned the same path as what we passed in, don't go recursive.
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// This can happen on Windows when walking up the directory hierarchy and not
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// finding anything that already exists (unlike POSIX that will eventually
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// find . or /).
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if (parent == path) {
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errno = ENOENT;
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return false;
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}
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// Recursively make parent directories of 'path'.
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if (!mkdirs(parent)) {
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return false;
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}
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// Now that the parent directory hierarchy of 'path' has been ensured,
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// create path itself.
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if (adb_mkdir(path, 0775) == -1) {
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const int saved_errno = errno;
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// If someone else created the directory, that is ok.
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if (directory_exists(path)) {
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return true;
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}
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// There might be a pre-existing file at 'path', or there might have been some other error.
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errno = saved_errno;
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return false;
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}
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return true;
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}
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std::string dump_hex(const void* data, size_t byte_count) {
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byte_count = std::min(byte_count, size_t(16));
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const uint8_t* p = reinterpret_cast<const uint8_t*>(data);
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std::string line;
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for (size_t i = 0; i < byte_count; ++i) {
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android::base::StringAppendF(&line, "%02x", p[i]);
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}
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line.push_back(' ');
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for (size_t i = 0; i < byte_count; ++i) {
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int ch = p[i];
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line.push_back(isprint(ch) ? ch : '.');
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}
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return line;
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}
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std::string perror_str(const char* msg) {
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return android::base::StringPrintf("%s: %s", msg, strerror(errno));
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}
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#if !defined(_WIN32)
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// Windows version provided in sysdeps_win32.cpp
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bool set_file_block_mode(int fd, bool block) {
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int flags = fcntl(fd, F_GETFL, 0);
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if (flags == -1) {
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PLOG(ERROR) << "failed to fcntl(F_GETFL) for fd " << fd;
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return false;
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}
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flags = block ? (flags & ~O_NONBLOCK) : (flags | O_NONBLOCK);
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if (fcntl(fd, F_SETFL, flags) != 0) {
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PLOG(ERROR) << "failed to fcntl(F_SETFL) for fd " << fd << ", flags " << flags;
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return false;
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}
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return true;
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}
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#endif
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bool forward_targets_are_valid(const std::string& source, const std::string& dest,
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std::string* error) {
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if (android::base::StartsWith(source, "tcp:")) {
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// The source port may be 0 to allow the system to select an open port.
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int port;
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if (!android::base::ParseInt(&source[4], &port) || port < 0) {
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*error = android::base::StringPrintf("Invalid source port: '%s'", &source[4]);
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return false;
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}
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}
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if (android::base::StartsWith(dest, "tcp:")) {
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// The destination port must be > 0.
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int port;
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if (!android::base::ParseInt(&dest[4], &port) || port <= 0) {
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*error = android::base::StringPrintf("Invalid destination port: '%s'", &dest[4]);
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return false;
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}
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}
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return true;
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}
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std::string adb_get_homedir_path() {
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#ifdef _WIN32
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WCHAR path[MAX_PATH];
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const HRESULT hr = SHGetFolderPathW(NULL, CSIDL_PROFILE, NULL, 0, path);
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if (FAILED(hr)) {
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D("SHGetFolderPathW failed: %s", android::base::SystemErrorCodeToString(hr).c_str());
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return {};
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}
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std::string home_str;
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if (!android::base::WideToUTF8(path, &home_str)) {
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return {};
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}
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return home_str;
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#else
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if (const char* const home = getenv("HOME")) {
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return home;
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}
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struct passwd pwent;
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struct passwd* result;
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int pwent_max = sysconf(_SC_GETPW_R_SIZE_MAX);
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std::vector<char> buf(pwent_max);
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int rc = getpwuid_r(getuid(), &pwent, buf.data(), buf.size(), &result);
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if (rc == 0 && result) {
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return result->pw_dir;
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}
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LOG(FATAL) << "failed to get user home directory";
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return {};
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#endif
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}
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std::string adb_get_android_dir_path() {
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std::string user_dir = adb_get_homedir_path();
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std::string android_dir = user_dir + OS_PATH_SEPARATOR + ".android";
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struct stat buf;
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if (stat(android_dir.c_str(), &buf) == -1) {
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if (adb_mkdir(android_dir.c_str(), 0750) == -1) {
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PLOG(FATAL) << "Cannot mkdir '" << android_dir << "'";
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}
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}
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return android_dir;
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}
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void AdbCloser::Close(int fd) {
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adb_close(fd);
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}
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