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/*
* ZeroTier One - Global Peer to Peer Ethernet
* Copyright (C) 2012-2013 ZeroTier Networks LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* --
*
* ZeroTier may be used and distributed under the terms of the GPLv3, which
* are available at: http://www.gnu.org/licenses/gpl-3.0.html
*
* If you would like to embed ZeroTier into a commercial application or
* redistribute it in a modified binary form, please contact ZeroTier Networks
* LLC. Start here: http://www.zerotier.com/
*/
#ifndef __WINDOWS__
#include <dlfcn.h>
#endif
#include "Utils.hpp"
#include "RuntimeEnvironment.hpp"
#include "RPC.hpp"
#include "Switch.hpp"
#include "Topology.hpp"
namespace ZeroTier {
RPC::LocalService::LocalService(const char *dllPath)
throw(std::invalid_argument) :
_handle((void *)0),
_init((void *)0),
_do((void *)0),
_free((void *)0),
_destroy((void *)0)
{
_handle = dlopen(dllPath,RTLD_LAZY|RTLD_LOCAL);
if (!_handle)
throw std::invalid_argument("Unable to load DLL: dlopen() failed");
_init = dlsym(_handle,"ZeroTierPluginInit");
if (!_init) {
dlclose(_handle);
throw std::invalid_argument("Unable to resolve symbol ZeroTierPluginInit in DLL");
}
_do = dlsym(_handle,"ZeroTierPluginDo");
if (!_do) {
dlclose(_handle);
throw std::invalid_argument("Unable to resolve symbol ZeroTierPluginDo in DLL");
}
_free = dlsym(_handle,"ZeroTierPluginFree");
if (!_free) {
dlclose(_handle);
throw std::invalid_argument("Unable to resolve symbol ZeroTierPluginFree in DLL");
}
_destroy = dlsym(_handle,"ZeroTierPluginDestroy");
if (!_destroy) {
dlclose(_handle);
throw std::invalid_argument("Unable to resolve symbol ZeroTierPluginDestroy in DLL");
}
if (((int (*)())_init)() < 0) {
dlclose(_handle);
throw std::invalid_argument("ZeroTierPluginInit() returned error");
}
}
RPC::LocalService::~LocalService()
{
if (_handle) {
if (_destroy)
((void (*)())_destroy)();
dlclose(_handle);
}
}
std::pair< int,std::vector<std::string> > RPC::LocalService::operator()(const std::vector<std::string> &args)
{
unsigned int alengths[4096];
const void *argptrs[4096];
const unsigned int *rlengths = (const unsigned int *)0;
const void **resultptrs = (const void **)0;
std::vector<std::string> results;
if (args.size() > 4096)
throw std::runtime_error("args[] too long");
for(unsigned int i=0;i<args.size();++i) {
alengths[i] = args[i].length();
argptrs[i] = (const void *)args[i].data();
}
int rcount = ((int (*)(unsigned int,const unsigned int *,const void **,const unsigned int **,const void ***))_do)((unsigned int)args.size(),alengths,argptrs,&rlengths,&resultptrs);
for(int i=0;i<rcount;++i)
results.push_back(std::string((const char *)resultptrs[i],rlengths[i]));
((void (*)(int,const unsigned int *,const void **))_free)(rcount,rlengths,resultptrs);
return std::pair< int,std::vector<std::string> >(rcount,results);
}
RPC::RPC(const RuntimeEnvironment *renv) :
_r(renv)
{
}
RPC::~RPC()
{
for(std::map<uint64_t,RemoteCallOutstanding>::iterator co(_remoteCallsOutstanding.begin());co!=_remoteCallsOutstanding.end();++co) {
if (co->second.handler)
co->second.handler(co->second.arg,co->first,co->second.peer,ZT_RPC_ERROR_CANCELLED,std::vector<std::string>());
}
for(std::map<std::string,LocalService *>::iterator s(_rpcServices.begin());s!=_rpcServices.end();++s)
delete s->second;
}
std::pair< int,std::vector<std::string> > RPC::callLocal(const std::string &name,const std::vector<std::string> &args)
{
Mutex::Lock _l(_rpcServices_m);
std::map<std::string,LocalService *>::iterator s(_rpcServices.find(name));
if (s == _rpcServices.end())
return std::pair< int,std::vector<std::string> >(ZT_RPC_ERROR_NOT_FOUND,std::vector<std::string>());
return ((*(s->second))(args));
}
uint64_t RPC::callRemote(
const Address &peer,
const std::string &name,
const std::vector<std::string> &args,
void (*handler)(void *,uint64_t,const Address &,int,const std::vector<std::string> &),
void *arg)
throw(std::invalid_argument,std::out_of_range)
{
Packet outp(peer,_r->identity.address(),Packet::VERB_RPC);
if (name.length() > 0xffff)
throw std::invalid_argument("function name too long");
outp.append((uint16_t)name.length());
outp.append(name);
for(std::vector<std::string>::const_iterator a(args.begin());a!=args.end();++a) {
if (a->length() > 0xffff)
throw std::invalid_argument("argument too long");
outp.append((uint16_t)a->length());
outp.append(*a);
}
outp.compress();
uint64_t id = outp.packetId();
{
Mutex::Lock _l(_remoteCallsOutstanding_m);
RemoteCallOutstanding &rc = _remoteCallsOutstanding[id];
rc.callTime = Utils::now();
rc.peer = peer;
rc.handler = handler;
rc.arg = arg;
}
_r->sw->send(outp,true);
return id;
}
void RPC::clean()
{
Mutex::Lock _l(_remoteCallsOutstanding_m);
uint64_t now = Utils::now();
for(std::map<uint64_t,RemoteCallOutstanding>::iterator co(_remoteCallsOutstanding.begin());co!=_remoteCallsOutstanding.end();) {
if ((now - co->second.callTime) >= ZT_RPC_TIMEOUT) {
if (co->second.handler)
co->second.handler(co->second.arg,co->first,co->second.peer,ZT_RPC_ERROR_EXPIRED_NO_RESPONSE,std::vector<std::string>());
_remoteCallsOutstanding.erase(co++);
} else ++co;
}
}
} // namespace ZeroTier
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