mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-19 13:07:55 +00:00
133 lines
3.4 KiB
C++
133 lines
3.4 KiB
C++
/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2012-2013 ZeroTier Networks LLC
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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*/
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#ifndef ZT_SERVICE_HPP
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#define ZT_SERVICE_HPP
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#include <string>
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#include <stdexcept>
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#include "Constants.hpp"
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#include "Dictionary.hpp"
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#include "Thread.hpp"
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#include "Mutex.hpp"
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/**
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* Maximum size of a service message in bytes (sanity limit)
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*/
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#define ZT_SERVICE_MAX_MESSAGE_SIZE 131072
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namespace ZeroTier {
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class RuntimeEnvironment;
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#ifndef __WINDOWS__
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/**
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* A subprocess that communicates with the host via a simple protocol
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*
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* This is currently only supported on *nix systems, and is used to implement
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* special plugins that are used by supernodes and network configuration
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* master nodes. Users will probably have no use for it.
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*
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* The simple binary protocol consists of a bidirectional stream of string-
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* serialized Dictionaries prefixed by a 32-bit message length. Input
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* messages are sent to the subprocess via its stdin, and output is read
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* from its stdout. Messages printed by the subprocess on its stderr are
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* logged via the standard Logger instance. If the subprocess dies, an
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* attempt is made to restart it every second.
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*/
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class Service
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{
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public:
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/**
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* Create and launch a new service
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*
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* @param renv Runtime environment
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* @param name Name of service
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* @param path Path to service binary
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* @param handler Handler function to call when service generates output
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* @param arg First argument to service
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*/
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Service(const RuntimeEnvironment *renv,
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const char *name,
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const char *path,
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void (*handler)(void *,Service &,const Dictionary &),
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void *arg);
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~Service();
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/**
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* Send a message to service subprocess
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*
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* @param msg Message in key/value dictionary form
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* @return True if message was sent
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*/
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bool send(const Dictionary &msg);
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/**
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* @return Name of service
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*/
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inline const char *name() const
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throw()
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{
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return _name.c_str();
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}
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/**
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* @return True if subprocess is running
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*/
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inline bool running() const
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throw()
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{
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return (_pid > 0);
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}
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/**
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* Thread main method; do not call elsewhere
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*/
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void threadMain()
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throw();
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private:
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const RuntimeEnvironment *_r;
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Thread _thread;
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std::string _path;
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std::string _name;
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void *_arg;
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void (*_handler)(void *,Service &,const Dictionary &);
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long _pid;
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int _childStdin;
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int _childStdout;
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int _childStderr;
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volatile bool _run;
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};
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#endif // __WINDOWS__
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} // namespace ZeroTier
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#endif
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