-/***************************************************************************
- * Copyright (C) 2006 by Gerd v. Egidy *
- * gve@intra2net.com *
- * *
- * This library is free software; you can redistribute it and/or modify *
- * it under the terms of the GNU Lesser General Public License version *
- * 2.1 as published by the Free Software Foundation. *
- * *
- * This library 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 Lesser General Public License for more details. *
- * *
- * You should have received a copy of the GNU Lesser General Public *
- * License along with this program; if not, write to the *
- * Free Software Foundation, Inc., *
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
- ***************************************************************************/
+/*
+Copyright (C) 2006 by Intra2net AG - Gerd v. Egidy
+
+The software in this package is distributed under the GNU General
+Public License version 2 (with a special exception described below).
+
+A copy of GNU General Public License (GPL) is included in this distribution,
+in the file COPYING.GPL.
+
+As a special exception, if other files instantiate templates or use macros
+or inline functions from this file, or you compile this file and link it
+with other works to produce a work based on this file, this file
+does not by itself cause the resulting work to be covered
+by the GNU General Public License.
+
+However the source code for this file must still be made available
+in accordance with section (3) of the GNU General Public License.
+
+This exception does not invalidate any other reasons why a work based
+on this file might be covered by the GNU General Public License.
+*/
#include <stdio.h>
#include <errno.h>
#include <pwd.h>
#include <grp.h>
+#include <sstream>
+
#include "socket_server.hxx"
#include "t2n_exception.hxx"
+#include "log.hxx"
using namespace std;
namespace libt2n
{
-socket_server::socket_server(int port, const char* ip)
- : server()
+/** @brief create a new tcp-based server
+ @param port tcp port you want to listen on
+ @param ip the local ip you want to listen on. "0.0.0.0" means all local ips (default).
+*/
+socket_server::socket_server(int port, const std::string& ip)
+ : server(), socket_handler(0,tcp_s)
{
- socket_type=tcp_s;
+ /* Create the socket. */
+ sock = socket (PF_INET, SOCK_STREAM, 0);
+ if (sock < 0)
+ EXCEPTIONSTREAM(error,t2n_server_error,"error opening socket: " << strerror(errno));
+ set_socket_options(sock);
+
+ /* Give the socket a name. */
+ struct sockaddr_in sockaddr;
+ sockaddr.sin_family = AF_INET;
+ sockaddr.sin_port = htons(port);
+
+ if (inet_aton(ip.c_str(),&sockaddr.sin_addr) == 0)
+ EXCEPTIONSTREAM(error,t2n_server_error,"failed listening on invalid ip " << ip);
+
+ if (bind (sock, (struct sockaddr *) &sockaddr, sizeof (sockaddr)) < 0)
+ {
+ // FIXME: Calls virtual function socket_server::get_logstream() in constructor
+ EXCEPTIONSTREAM(error,t2n_server_error,"error binding socket: " << strerror(errno));
+ }
+
+ start_listening();
}
-socket_server::socket_server(const char* path, mode_t filemode, const char* user, const char* group)
- : server()
+/** @brief create a new unix-socked-based server
+ @param path path of the socket
+ @param filemode permissions you want to open the socket with
+ @param user local username for the socket
+ @param group local groupname for the socket
+*/
+socket_server::socket_server(const std::string& path, mode_t filemode, const std::string& user, const std::string& group)
+ : server(), socket_handler(0,unix_s)
{
- socket_type=unix_s;
unix_path=path;
+ // TODO: Every EXCEPTIONSTREAM in here calls virtual function get_logstream()
+
/* Create the socket. */
sock = socket (PF_UNIX, SOCK_STREAM, 0);
if (sock < 0)
- {
- string err="error opening socket: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
+ EXCEPTIONSTREAM(error,t2n_server_error,"error opening socket: " << strerror(errno));
set_socket_options(sock);
unlink (unix_name.sun_path);
if (bind (sock, (struct sockaddr *) &unix_name, sizeof (unix_name)) < 0)
- {
- string err="error binding socket: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
+ EXCEPTIONSTREAM(error,t2n_server_error,"error binding socket: " << strerror(errno));
/* change permissions */
if (chmod (unix_name.sun_path, filemode) != 0)
- {
- string err="error changing permission: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
+ EXCEPTIONSTREAM(error,t2n_server_error,"error changing permission: " << strerror(errno));
- struct passwd *socket_user = getpwnam (user);
- if (socket_user == NULL)
+ if (!user.empty() && !group.empty())
{
- string err="error getting socket user: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
+ // TODO maybe use current user/group if one of them is empty
- struct group *socket_group = getgrnam (group);
- if (socket_group == NULL)
- {
- string err="error getting socket group: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
+ struct passwd *socket_user = getpwnam (user.c_str());
+ if (socket_user == NULL)
+ EXCEPTIONSTREAM(error,t2n_server_error,"error getting socket user: " << strerror(errno));
- if (chown (unix_name.sun_path, socket_user->pw_uid, socket_group->gr_gid) != 0)
- {
- string err="error changing socket ownership: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
+ struct group *socket_group = getgrnam (group.c_str());
+ if (socket_group == NULL)
+ EXCEPTIONSTREAM(error,t2n_server_error,"error getting socket group: " << strerror(errno));
- if (listen (sock, 5) < 0)
- {
- string err="error listening to socket: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
+ if (chown (unix_name.sun_path, socket_user->pw_uid, socket_group->gr_gid) != 0)
+ EXCEPTIONSTREAM(error,t2n_server_error,"error changing socket ownership: " << strerror(errno));
}
- /* clear & insert server sock into the fd_tab to prepare select */
- FD_ZERO(&connection_set);
- FD_SET (sock, &connection_set);
+ start_listening();
}
-void socket_server::set_socket_options(int sock)
+/**
+ * Destructor
+ */
+socket_server::~socket_server()
{
- int i=1;
-
- /* fast reuse enable */
- if (setsockopt(sock,SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i)) < 0)
- {
- string err="error setting socket option: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
+ // close all client connections
+ server::close();
- /* keepalive enable */
- if (setsockopt(sock,SOL_SOCKET, SO_KEEPALIVE, &i, sizeof(i)) < 0)
- {
- string err="error setting socket option: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
+ // server socket will be closed by destructor of socket_handler
- /* close on exec */
- int fdflags;
- fdflags=fcntl(sock,F_GETFD, 0);
- if (fdflags < 0)
- {
- string err="fcntl error on socket: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
- fdflags |= FD_CLOEXEC;
- if (fcntl(sock,F_SETFD,fdflags) < 0)
- {
- string err="fcntl error on socket: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
+ if (get_type()==unix_s)
+ unlink(unix_path.c_str());
- /* non-blocking mode */
- int flflags;
- flflags=fcntl(sock,F_GETFL,0);
- if (flflags < 0)
- {
- string err="fcntl error on socket: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
- flflags |= O_NONBLOCK;
- if (fcntl(sock,F_SETFL,flflags) < 0)
+ // disconnect connection<->server pointer
+ std::map<unsigned int, server_connection*>::iterator it, it_end = connections.end();
+ for (it = connections.begin(); it != it_end; ++it)
{
- string err="fcntl error on socket: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
+ socket_server_connection *conn = dynamic_cast<socket_server_connection*>(it->second);
+ if (conn)
+ conn->my_server = NULL;
}
}
-socket_server::~socket_server()
+/// start listening on a new server socket (called by the constructors)
+void socket_server::start_listening()
{
- close(sock);
+ if (listen (sock, 5) < 0)
+ EXCEPTIONSTREAM(error,t2n_server_error,"error listening to socket: " << strerror(errno));
- if (socket_type==unix_s)
- unlink(unix_path.c_str());
+ /* clear & insert server sock into the fd_tab to prepare select */
+ FD_ZERO(&connection_set);
+ FD_SET (sock, &connection_set);
}
+/// handle a new connection from a client
void socket_server::new_connection()
{
struct sockaddr_un clientname;
int newsock = accept (sock,(struct sockaddr *) &clientname,&size);
if (newsock < 0)
{
- if (errno == EAGAIN)
+ // return on non-fatal errors (list taken from man-page)
+ if (errno == EAGAIN || errno == EWOULDBLOCK || errno == ECONNABORTED || errno == EINTR ||
+ errno == EMFILE || errno == ENFILE || errno == ENOBUFS || errno == ENOMEM ||
+ errno == EPROTO || errno == EPERM || errno == ETIMEDOUT)
{
- log(error, "accept error (EAGAIN): no connection waiting");
+ LOGSTREAM(error,"non-fatal accept error: " << strerror(errno));
return;
}
- /* default: break */
- string err="error accepting connection: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
+ /* fatal error: will usually kill or restart the server */
+ EXCEPTIONSTREAM(error,t2n_server_error,"fatal error accepting connection: " << strerror(errno));
}
FD_SET (newsock, &connection_set);
- int i=1;
-
- /* keepalive enable */
- if (setsockopt(newsock,SOL_SOCKET, SO_KEEPALIVE, &i, sizeof(i)) < 0)
- {
- string err="error setting socket option: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
-
- /* close on exec */
- int fdflags;
- fdflags=fcntl(newsock,F_GETFD, 0);
- if (fdflags < 0)
- {
- string err="fcntl error on socket: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
- fdflags |= FD_CLOEXEC;
- if (fcntl(newsock,F_SETFD,fdflags) < 0)
- {
- string err="fcntl error on socket: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
-
- /* non-blocking mode */
- int flflags;
- flflags=fcntl(newsock,F_GETFL,0);
- if (flflags < 0)
- {
- string err="fcntl error on socket: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
- flflags |= O_NONBLOCK;
- if (fcntl(newsock,F_SETFL,flflags) < 0)
- {
- string err="fcntl error on socket: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
+ socket_server_connection *nc=new socket_server_connection(newsock, get_type(), get_default_timeout());
+ nc->set_socket_options(newsock);
- add_connection(new socket_connection(newsock, get_default_timeout()));
+ add_connection(nc);
return;
}
-void socket_server::fill_buffer(long long usec_timeout)
+/** @brief look for new connections and new data in any of the existing connections
+ @param usec_timeout wait until new data is found, max timeout usecs.
+ -1: wait endless
+ 0: return instantly
+ @param usec_timeout_remaining if non-NULL the function will write the
+ not used time to the given target
+ @retval true if new data was found (does not mean that the received data
+ is a complete packet though)
+*/
+bool socket_server::fill_buffer(long long usec_timeout,long long* usec_timeout_remaining)
{
fd_set used_fdset=connection_set;
int ret=select (FD_SETSIZE, &used_fdset, NULL, NULL, timeout_ptr);
+ // return the timeout we did not use
+ if (usec_timeout > 0 && usec_timeout_remaining != NULL)
+ *usec_timeout_remaining=(tval.tv_sec*1000000)+tval.tv_usec;
+
if (ret < 0)
{
if (errno == EINTR)
ret=0;
}
else
- {
- string err="select error: ";
- err+=strerror(errno);
- log(error, err);
- throw t2n_server_error(err);
- }
+ EXCEPTIONSTREAM(error,t2n_server_error,"select error: " << strerror(errno));
}
if (ret > 0)
}
// check all connections for pending data
- fill_connection_buffers();
+ return fill_connection_buffers();
}
- return;
+ return false;
}
-socket_connection::socket_connection(int _sock, int _timeout)
- : connection(_timeout)
+/// call fill_buffer() on all connections, called from fill_buffer()
+bool socket_server::fill_connection_buffers()
{
- sock=_sock;
-}
+ bool data_found = false;
-void socket_connection::close()
-{
+ std::map<unsigned int, server_connection*>::iterator ie=connections.end();
+ for(std::map<unsigned int, server_connection*>::iterator i=connections.begin(); i != ie; i++)
+ if (!i->second->server_connection::is_closed())
+ {
+ // shutdown all connections which throw exceptions to protect the server
+ try
+ {
+ if (i->second->fill_buffer(0))
+ data_found=true;
+ }
+ catch (t2n_transfer_error &e)
+ { i->second->close(); }
+ catch(...)
+ { throw; }
+ }
+ return data_found;
}
-void socket_connection::fill_buffer(void)
+/// remove the socket of a connection after the connection has been closed
+void socket_server::remove_connection_socket(int sock)
{
+ FD_CLR(sock, &connection_set);
+}
+/**
+ * Destructor
+ */
+socket_server_connection::~socket_server_connection()
+{
+ // Only notify parent server about going down.
+ // The real socket will be closed by the destructor of the base classes.
+ if (my_server && sock != -1)
+ {
+ socket_server *srv = dynamic_cast<socket_server*>(my_server);
+ if (srv)
+ srv->remove_connection_socket(sock);
+ }
}
-void socket_connection::write(const std::string& data)
+/// close this connection. complete data waiting in the buffer can still be retrieved.
+void socket_server_connection::close()
{
+ if (my_server && sock != -1)
+ {
+ socket_server *srv = dynamic_cast<socket_server*>(my_server);
+ if (srv)
+ srv->remove_connection_socket(sock);
+ }
+ if (!server_connection::is_closed())
+ {
+ socket_handler::close();
+ server_connection::close();
+ }
}
}