2 * Copyright 2001-2007 Internet2
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
20 * Berkeley Socket-based ListenerService implementation
24 #include "exceptions.h"
25 #include "ServiceProvider.h"
26 #include "remoting/impl/SocketListener.h"
31 #include <shibsp/SPConfig.h>
32 #include <xmltooling/util/NDC.h>
35 # include <netinet/in.h>
42 using namespace shibsp;
43 using namespace xmltooling;
45 using xercesc::DOMElement;
49 // Manages the pool of connections
53 SocketPool(Category& log, const SocketListener* listener)
54 : m_log(log), m_listener(listener), m_lock(Mutex::create()) {}
56 SocketListener::ShibSocket get();
57 void put(SocketListener::ShibSocket s);
60 SocketListener::ShibSocket connect();
63 const SocketListener* m_listener;
64 auto_ptr<Mutex> m_lock;
65 stack<SocketListener::ShibSocket> m_pool;
68 // Worker threads in server
71 ServerThread(SocketListener::ShibSocket& s, SocketListener* listener, unsigned long id);
74 int job(); // Return -1 on error, 1 for closed, 0 for success
77 SocketListener::ShibSocket m_sock;
79 SocketListener* m_listener;
85 SocketListener::ShibSocket SocketPool::connect()
91 m_log.debug("trying to connect to listener");
93 SocketListener::ShibSocket sock;
94 if (!m_listener->create(sock)) {
95 m_log.error("cannot create socket");
96 throw ListenerException("Cannot create socket");
99 bool connected = false;
102 for (int i = num_tries-1; i >= 0; i--) {
103 if (m_listener->connect(sock)) {
108 m_log.warn("cannot connect socket (%u)...%s", sock, (i > 0 ? "retrying" : ""));
112 Sleep(2000*(num_tries-i));
114 sleep(2*(num_tries-i));
120 m_log.crit("socket server unavailable, failing");
121 m_listener->close(sock);
122 throw ListenerException("Cannot connect to shibd process, a site adminstrator should be notified.");
125 m_log.debug("socket (%u) connected successfully", sock);
129 SocketPool::~SocketPool()
131 while (!m_pool.empty()) {
133 closesocket(m_pool.top());
135 ::close(m_pool.top());
141 SocketListener::ShibSocket SocketPool::get()
144 if (m_pool.empty()) {
148 SocketListener::ShibSocket ret=m_pool.top();
154 void SocketPool::put(SocketListener::ShibSocket s)
161 SocketListener::SocketListener(const DOMElement* e) : m_catchAll(false), log(&Category::getInstance(SHIBSP_LOGCAT".Listener")),
162 m_socketpool(NULL), m_shutdown(NULL), m_child_lock(NULL), m_child_wait(NULL), m_socket((ShibSocket)0)
165 if (SPConfig::getConfig().isEnabled(SPConfig::InProcess)) {
166 m_socketpool=new SocketPool(*log,this);
169 if (SPConfig::getConfig().isEnabled(SPConfig::OutOfProcess)) {
170 m_child_lock = Mutex::create();
171 m_child_wait = CondWait::create();
175 SocketListener::~SocketListener()
182 bool SocketListener::run(bool* shutdown)
187 log->info("listener service starting");
189 ServiceProvider* sp = SPConfig::getConfig().getServiceProvider();
191 const PropertySet* props = sp->getPropertySet("OutOfProcess");
193 pair<bool,bool> flag = props->getBool("catchAll");
194 m_catchAll = flag.first && flag.second;
198 // Save flag to monitor for shutdown request.
200 unsigned long count = 0;
202 if (!create(m_socket)) {
203 log->crit("failed to create socket");
206 if (!bind(m_socket,true)) {
207 this->close(m_socket);
208 log->crit("failed to bind to socket.");
212 while (!*m_shutdown) {
215 FD_SET(m_socket, &readfds);
216 struct timeval tv = { 0, 0 };
219 switch (select(m_socket + 1, &readfds, 0, 0, &tv)) {
225 if (errno == EINTR) continue;
227 log->error("select() on main listener socket failed");
235 // Accept the connection.
236 SocketListener::ShibSocket newsock;
237 if (!accept(m_socket, newsock))
238 log->crit("failed to accept incoming socket connection");
240 // We throw away the result because the children manage themselves...
242 new ServerThread(newsock,this,++count);
245 log->crit("error starting new server thread to service incoming request");
252 log->info("listener service shutting down");
254 // Wait for all children to exit.
255 m_child_lock->lock();
256 while (!m_children.empty())
257 m_child_wait->wait(m_child_lock);
258 m_child_lock->unlock();
260 this->close(m_socket);
261 m_socket=(ShibSocket)0;
265 DDF SocketListener::send(const DDF& in)
271 log->debug("sending message (%s)", in.name() ? in.name() : "unnamed");
273 // Serialize data for transmission.
276 string ostr(os.str());
278 // Loop on the RPC in case we lost contact the first time through
285 SocketListener::ShibSocket sock;
287 sock = m_socketpool->get();
289 int outlen = ostr.length();
291 if (send(sock,(char*)&len,sizeof(len)) != sizeof(len) || send(sock,ostr.c_str(),outlen) != outlen) {
297 throw ListenerException("Failure sending remoted message ($1).", params(1,in.name()));
305 log->debug("send completed, reading response message");
308 while (recv(sock,(char*)&len,sizeof(len)) != sizeof(len)) {
309 if (errno == EINTR) continue; // Apparently this happens when a signal interrupts the blocking call.
310 log->error("error reading size of output message");
312 throw ListenerException("Failure receiving response to remoted message ($1).", params(1,in.name()));
320 size_read = recv(sock, buf, sizeof(buf));
322 is.write(buf, size_read);
325 else if (errno != EINTR) {
331 log->error("error reading output message from socket");
333 throw ListenerException("Failure receiving response to remoted message ($1).", params(1,in.name()));
336 m_socketpool->put(sock);
342 // Check for exception to unmarshall and throw, otherwise return.
343 if (out.isstring() && out.name() && !strcmp(out.name(),"exception")) {
344 // Reconstitute exception object.
345 DDFJanitor jout(out);
346 XMLToolingException* except=NULL;
348 except=XMLToolingException::fromString(out.string());
349 log->error("remoted message returned an error: %s", except->what());
351 catch (XMLToolingException& e) {
352 log->error("caught XMLToolingException while building the XMLToolingException: %s", e.what());
353 log->error("XML was: %s", out.string());
354 throw ListenerException("Remote call failed with an unparsable exception.");
357 auto_ptr<XMLToolingException> wrapper(except);
364 bool SocketListener::log_error() const
367 int rc=WSAGetLastError();
371 #ifdef HAVE_STRERROR_R
373 memset(buf,0,sizeof(buf));
374 strerror_r(rc,buf,sizeof(buf));
375 log->error("socket call resulted in error (%d): %s",rc,isprint(*buf) ? buf : "no message");
377 const char* buf=strerror(rc);
378 log->error("socket call resulted in error (%d): %s",rc,isprint(*buf) ? buf : "no message");
383 // actual function run in listener on server threads
384 void* server_thread_fn(void* arg)
386 ServerThread* child = (ServerThread*)arg;
389 // First, let's block all signals
390 Thread::mask_all_signals();
393 // Run the child until it exits.
396 // Now we can clean up and exit the thread.
401 ServerThread::ServerThread(SocketListener::ShibSocket& s, SocketListener* listener, unsigned long id)
402 : m_sock(s), m_child(NULL), m_listener(listener)
406 buf << "[" << id << "]";
409 // Create the child thread
410 m_child = Thread::create(server_thread_fn, (void*)this);
414 ServerThread::~ServerThread()
416 // Then lock the children map, remove this socket/thread, signal waiters, and return
417 m_listener->m_child_lock->lock();
418 m_listener->m_children.erase(m_sock);
419 m_listener->m_child_lock->unlock();
420 m_listener->m_child_wait->signal();
425 void ServerThread::run()
429 // Before starting up, make sure we fully "own" this socket.
430 m_listener->m_child_lock->lock();
431 while (m_listener->m_children.find(m_sock)!=m_listener->m_children.end())
432 m_listener->m_child_wait->wait(m_listener->m_child_lock);
433 m_listener->m_children[m_sock] = m_child;
434 m_listener->m_child_lock->unlock();
438 struct timeval tv = { 0, 0 };
440 while(!*(m_listener->m_shutdown)) {
442 FD_SET(m_sock, &readfds);
445 switch (select(m_sock+1, &readfds, 0, 0, &tv)) {
451 if (errno == EINTR) continue;
452 m_listener->log_error();
453 m_listener->log->error("select() on incoming request socket (%u) returned error", m_sock);
463 m_listener->log_error();
464 m_listener->log->error("I/O failure processing request on socket (%u)", m_sock);
466 m_listener->close(m_sock);
473 int ServerThread::job()
475 Category& log = Category::getInstance(SHIBSP_LOGCAT".Listener");
477 bool incomingError = true; // set false once incoming message is received
487 int readlength = m_listener->recv(m_sock,(char*)&len,sizeof(len));
488 if (readlength == 0) {
489 log.info("detected socket closure, shutting down worker thread");
492 else if (readlength != sizeof(len)) {
493 log.error("error reading size of input message");
500 while (len && (size_read = m_listener->recv(m_sock, m_buf, sizeof(m_buf))) > 0) {
501 is.write(m_buf, size_read);
506 log.error("error reading input message from socket");
510 // Unmarshall the message.
515 log.debug("dispatching message (%s)", in.name() ? in.name() : "unnamed");
517 incomingError = false;
519 // Dispatch the message.
520 m_listener->receive(in, sink);
522 catch (XMLToolingException& e) {
524 log.error("error processing incoming message: %s", e.what());
525 DDF out=DDF("exception").string(e.toString().c_str());
526 DDFJanitor jout(out);
529 catch (exception& e) {
531 log.error("error processing incoming message: %s", e.what());
532 ListenerException ex(e.what());
533 DDF out=DDF("exception").string(ex.toString().c_str());
534 DDFJanitor jout(out);
539 log.error("unexpected error processing incoming message");
540 if (!m_listener->m_catchAll)
542 ListenerException ex("An unexpected error occurred while processing an incoming message.");
543 DDF out=DDF("exception").string(ex.toString().c_str());
544 DDFJanitor jout(out);
548 // Return whatever's available.
549 string response(sink.str());
550 int outlen = response.length();
552 if (m_listener->send(m_sock,(char*)&len,sizeof(len)) != sizeof(len)) {
553 log.error("error sending output message size");
556 if (m_listener->send(m_sock,response.c_str(),outlen) != outlen) {
557 log.error("error sending output message");