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/*
* Copyright (C) 2015 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.
*/
#define TRACE_TAG ADB
#include "adb_utils.h"
#include <libgen.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <algorithm>
#include <base/logging.h>
#include <base/stringprintf.h>
#include <base/strings.h>
#include "adb_trace.h"
#include "sysdeps.h"
ADB_MUTEX_DEFINE(dirname_lock);
bool getcwd(std::string* s) {
char* cwd = getcwd(nullptr, 0);
if (cwd != nullptr) *s = cwd;
free(cwd);
return (cwd != nullptr);
}
bool directory_exists(const std::string& path) {
struct stat sb;
return lstat(path.c_str(), &sb) != -1 && S_ISDIR(sb.st_mode);
}
std::string escape_arg(const std::string& s) {
std::string result = s;
// Escape any ' in the string (before we single-quote the whole thing).
// The correct way to do this for the shell is to replace ' with '\'' --- that is,
// close the existing single-quoted string, escape a single single-quote, and start
// a new single-quoted string. Like the C preprocessor, the shell will concatenate
// these pieces into one string.
for (size_t i = 0; i < s.size(); ++i) {
if (s[i] == '\'') {
result.insert(i, "'\\'");
i += 2;
}
}
// Prefix and suffix the whole string with '.
result.insert(result.begin(), '\'');
result.push_back('\'');
return result;
}
std::string adb_basename(const std::string& path) {
size_t base = path.find_last_of(OS_PATH_SEPARATORS);
return (base != std::string::npos) ? path.substr(base + 1) : path;
}
std::string adb_dirname(const std::string& path) {
// Copy path because dirname may modify the string passed in.
std::string parent_storage(path);
// Use lock because dirname() may write to a process global and return a
// pointer to that. Note that this locking strategy only works if all other
// callers to dirname in the process also grab this same lock.
adb_mutex_lock(&dirname_lock);
// Note that if std::string uses copy-on-write strings, &str[0] will cause
// the copy to be made, so there is no chance of us accidentally writing to
// the storage for 'path'.
char* parent = dirname(&parent_storage[0]);
// In case dirname returned a pointer to a process global, copy that string
// before leaving the lock.
const std::string result(parent);
adb_mutex_unlock(&dirname_lock);
return result;
}
// Given a relative or absolute filepath, create the parent directory hierarchy
// as needed. Returns true if the hierarchy is/was setup.
bool mkdirs(const std::string& path) {
// TODO: all the callers do unlink && mkdirs && adb_creat ---
// that's probably the operation we should expose.
// Implementation Notes:
//
// Pros:
// - Uses dirname, so does not need to deal with OS_PATH_SEPARATOR.
// - On Windows, uses mingw dirname which accepts '/' and '\\', drive letters
// (C:\foo), UNC paths (\\server\share\dir\dir\file), and Unicode (when
// combined with our adb_mkdir() which takes UTF-8).
// - Is optimistic wrt thinking that a deep directory hierarchy will exist.
// So it does as few stat()s as possible before doing mkdir()s.
// Cons:
// - Recursive, so it uses stack space relative to number of directory
// components.
const std::string parent(adb_dirname(path));
if (directory_exists(parent)) {
return true;
}
// If dirname returned the same path as what we passed in, don't go recursive.
// This can happen on Windows when walking up the directory hierarchy and not
// finding anything that already exists (unlike POSIX that will eventually
// find . or /).
if (parent == path) {
errno = ENOENT;
return false;
}
// Recursively make parent directories of 'parent'.
if (!mkdirs(parent)) {
return false;
}
// Now that the parent directory hierarchy of 'parent' has been ensured,
// create parent itself.
if (adb_mkdir(parent, 0775) == -1) {
// Can't just check for errno == EEXIST because it might be a file that
// exists.
const int saved_errno = errno;
if (directory_exists(parent)) {
return true;
}
errno = saved_errno;
return false;
}
return true;
}
std::string dump_hex(const void* data, size_t byte_count) {
byte_count = std::min(byte_count, size_t(16));
const uint8_t* p = reinterpret_cast<const uint8_t*>(data);
std::string line;
for (size_t i = 0; i < byte_count; ++i) {
android::base::StringAppendF(&line, "%02x", p[i]);
}
line.push_back(' ');
for (size_t i = 0; i < byte_count; ++i) {
int c = p[i];
if (c < 32 || c > 127) {
c = '.';
}
line.push_back(c);
}
return line;
}
bool parse_host_and_port(const std::string& address,
std::string* canonical_address,
std::string* host, int* port,
std::string* error) {
host->clear();
bool ipv6 = true;
bool saw_port = false;
size_t colons = std::count(address.begin(), address.end(), ':');
size_t dots = std::count(address.begin(), address.end(), '.');
std::string port_str;
if (address[0] == '[') {
// [::1]:123
if (address.rfind("]:") == std::string::npos) {
*error = android::base::StringPrintf("bad IPv6 address '%s'", address.c_str());
return false;
}
*host = address.substr(1, (address.find("]:") - 1));
port_str = address.substr(address.rfind("]:") + 2);
saw_port = true;
} else if (dots == 0 && colons >= 2 && colons <= 7) {
// ::1
*host = address;
} else if (colons <= 1) {
// 1.2.3.4 or some.accidental.domain.com
ipv6 = false;
std::vector<std::string> pieces = android::base::Split(address, ":");
*host = pieces[0];
if (pieces.size() > 1) {
port_str = pieces[1];
saw_port = true;
}
}
if (host->empty()) {
*error = android::base::StringPrintf("no host in '%s'", address.c_str());
return false;
}
if (saw_port) {
if (sscanf(port_str.c_str(), "%d", port) != 1 || *port <= 0 || *port > 65535) {
*error = android::base::StringPrintf("bad port number '%s' in '%s'",
port_str.c_str(), address.c_str());
return false;
}
}
*canonical_address = android::base::StringPrintf(ipv6 ? "[%s]:%d" : "%s:%d", host->c_str(), *port);
LOG(DEBUG) << "parsed " << address << " as " << *host << " and " << *port
<< " (" << *canonical_address << ")";
return true;
}
std::string perror_str(const char* msg) {
return android::base::StringPrintf("%s: %s", msg, strerror(errno));
}