mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-18 20:47:53 +00:00
306 lines
8.4 KiB
C++
306 lines
8.4 KiB
C++
/*
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* Copyright (c)2013-2020 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2026-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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/****/
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#ifndef ZT_OSUTILS_HPP
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#define ZT_OSUTILS_HPP
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <time.h>
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#include <stdexcept>
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#include <vector>
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#include <map>
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#include "../node/Constants.hpp"
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#include "../node/InetAddress.hpp"
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#ifdef __WINDOWS__
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#include <winsock2.h>
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#include <windows.h>
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#include <shlwapi.h>
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#else
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#include <unistd.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <arpa/inet.h>
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#ifdef __LINUX__
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#include <sys/syscall.h>
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#endif
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#endif
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#ifndef OMIT_JSON_SUPPORT
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#include <nlohmann/json.hpp>
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#endif
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namespace ZeroTier {
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/**
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* Miscellaneous utility functions and global constants
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*/
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class OSUtils
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{
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public:
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/**
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* Variant of snprintf that is portable and throws an exception
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*
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* This just wraps the local implementation whatever it's called, while
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* performing a few other checks and adding exceptions for overflow.
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*
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* @param buf Buffer to write to
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* @param len Length of buffer in bytes
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* @param fmt Format string
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* @param ... Format arguments
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* @throws std::length_error buf[] too short (buf[] will still be left null-terminated)
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*/
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static unsigned int ztsnprintf(char *buf,unsigned int len,const char *fmt,...);
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/**
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* Converts a uint64_t network ID into a string
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*
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* @param nwid network ID
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* @throws std::length_error buf[] too short (buf[] will still be left null-terminated)
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*/
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static std::string networkIDStr(const uint64_t nwid);
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/**
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* Converts a uint64_t node ID into a string
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*
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* @param nid node ID
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* @throws std::length_error buf[] too short (buf[] will still be left null-terminated)
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*/
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static std::string nodeIDStr(const uint64_t nid);
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#ifdef __UNIX_LIKE__
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/**
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* Close STDOUT_FILENO and STDERR_FILENO and replace them with output to given path
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*
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* This can be called after fork() and prior to exec() to suppress output
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* from a subprocess, such as auto-update.
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*
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* @param stdoutPath Path to file to use for stdout
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* @param stderrPath Path to file to use for stderr, or NULL for same as stdout (default)
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* @return True on success
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*/
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static bool redirectUnixOutputs(const char *stdoutPath,const char *stderrPath = (const char *)0)
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throw();
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#endif // __UNIX_LIKE__
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/**
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* Delete a file
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*
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* @param path Path to delete
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* @return True if delete was successful
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*/
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static inline bool rm(const char *path)
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{
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#ifdef __WINDOWS__
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return (DeleteFileA(path) != FALSE);
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#else
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return (unlink(path) == 0);
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#endif
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}
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static inline bool rm(const std::string &path) { return rm(path.c_str()); }
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static inline bool mkdir(const char *path)
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{
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#ifdef __WINDOWS__
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if (::PathIsDirectoryA(path))
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return true;
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return (::CreateDirectoryA(path,NULL) == TRUE);
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#else
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if (::mkdir(path,0755) != 0)
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return (errno == EEXIST);
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return true;
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#endif
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}
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static inline bool mkdir(const std::string &path) { return OSUtils::mkdir(path.c_str()); }
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static inline bool rename(const char *o,const char *n)
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{
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#ifdef __WINDOWS__
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DeleteFileA(n);
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return (::rename(o,n) == 0);
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#else
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return (::rename(o,n) == 0);
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#endif
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}
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/**
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* List a directory's contents
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*
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* @param path Path to list
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* @param includeDirectories If true, include directories as well as files
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* @return Names of files in directory (without path prepended)
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*/
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static std::vector<std::string> listDirectory(const char *path,bool includeDirectories = false);
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/**
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* Clean a directory of files whose last modified time is older than this
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*
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* This ignores directories, symbolic links, and other special files.
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*
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* @param olderThan Last modified older than timestamp (ms since epoch)
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* @return Number of cleaned files or negative on fatal error
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*/
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static long cleanDirectory(const char *path,const int64_t olderThan);
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/**
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* Delete a directory and all its files and subdirectories recursively
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*
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* @param path Path to delete
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* @return True on success
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*/
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static bool rmDashRf(const char *path);
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/**
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* Set modes on a file to something secure
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*
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* This locks a file so that only the owner can access it. What it actually
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* does varies by platform.
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*
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* @param path Path to lock
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* @param isDir True if this is a directory
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*/
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static void lockDownFile(const char *path,bool isDir);
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/**
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* Get file last modification time
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*
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* Resolution is often only second, not millisecond, but the return is
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* always in ms for comparison against now().
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*
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* @param path Path to file to get time
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* @return Last modification time in ms since epoch or 0 if not found
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*/
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static uint64_t getLastModified(const char *path);
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/**
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* @param path Path to check
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* @param followLinks Follow links (on platforms with that concept)
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* @return True if file or directory exists at path location
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*/
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static bool fileExists(const char *path,bool followLinks = true);
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/**
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* @param path Path to file
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* @return File size or -1 if nonexistent or other failure
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*/
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static int64_t getFileSize(const char *path);
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/**
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* Get IP (v4 and/or v6) addresses for a given host
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*
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* This is a blocking resolver.
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*
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* @param name Host name
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* @return IP addresses in InetAddress sort order or empty vector if not found
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*/
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static std::vector<InetAddress> resolve(const char *name);
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/**
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* @return Current time in milliseconds since epoch
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*/
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static inline int64_t now()
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{
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#ifdef __WINDOWS__
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FILETIME ft;
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SYSTEMTIME st;
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ULARGE_INTEGER tmp;
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GetSystemTime(&st);
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SystemTimeToFileTime(&st,&ft);
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tmp.LowPart = ft.dwLowDateTime;
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tmp.HighPart = ft.dwHighDateTime;
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return (int64_t)( ((tmp.QuadPart - 116444736000000000LL) / 10000L) + st.wMilliseconds );
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#else
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struct timeval tv;
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gettimeofday(&tv,(struct timezone *)0);
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return ( (1000LL * (int64_t)tv.tv_sec) + (int64_t)(tv.tv_usec / 1000) );
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#endif
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};
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/**
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* Read the full contents of a file into a string buffer
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*
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* The buffer isn't cleared, so if it already contains data the file's data will
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* be appended.
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*
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* @param path Path of file to read
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* @param buf Buffer to fill
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* @return True if open and read successful
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*/
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static bool readFile(const char *path,std::string &buf);
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/**
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* Write a block of data to disk, replacing any current file contents
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*
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* @param path Path to write
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* @param buf Buffer containing data
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* @param len Length of buffer
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* @return True if entire file was successfully written
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*/
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static bool writeFile(const char *path,const void *buf,unsigned int len);
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/**
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* Split a string by delimiter, with optional escape and quote characters
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*
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* @param s String to split
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* @param sep One or more separators
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* @param esc Zero or more escape characters
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* @param quot Zero or more quote characters
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* @return Vector of tokens
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*/
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static std::vector<std::string> split(const char *s,const char *const sep,const char *esc,const char *quot);
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/**
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* Write a block of data to disk, replacing any current file contents
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*
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* @param path Path to write
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* @param s Data to write
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* @return True if entire file was successfully written
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*/
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static inline bool writeFile(const char *path,const std::string &s) { return writeFile(path,s.data(),(unsigned int)s.length()); }
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/**
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* @param c ASCII character to convert
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* @return Lower case ASCII character or unchanged if not a letter
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*/
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static inline char toLower(char c) throw() { return (char)OSUtils::TOLOWER_TABLE[(unsigned long)c]; }
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/**
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* @return Platform default ZeroTier One home path
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*/
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static std::string platformDefaultHomePath();
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#ifndef OMIT_JSON_SUPPORT
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static nlohmann::json jsonParse(const std::string &buf);
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static std::string jsonDump(const nlohmann::json &j,int indentation = 1);
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static uint64_t jsonInt(const nlohmann::json &jv,const uint64_t dfl);
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static double jsonDouble(const nlohmann::json &jv,const double dfl);
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static uint64_t jsonIntHex(const nlohmann::json &jv,const uint64_t dfl);
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static bool jsonBool(const nlohmann::json &jv,const bool dfl);
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static std::string jsonString(const nlohmann::json &jv,const char *dfl);
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static std::string jsonBinFromHex(const nlohmann::json &jv);
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#endif // OMIT_JSON_SUPPORT
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private:
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static const unsigned char TOLOWER_TABLE[256];
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};
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} // namespace ZeroTier
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#endif
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