1 /***************************************************************************
2 * Copyright (C) 2006 by Gerd v. Egidy *
5 * This library is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU Lesser General Public License version *
7 * 2.1 as published by the Free Software Foundation. *
9 * This library is distributed in the hope that it will be useful, *
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
12 * GNU Lesser General Public License for more details. *
14 * You should have received a copy of the GNU Lesser General Public *
15 * License along with this program; if not, write to the *
16 * Free Software Foundation, Inc., *
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
18 ***************************************************************************/
24 #include <sys/types.h>
25 #include <sys/socket.h>
28 #include <arpa/inet.h>
29 #include <netinet/in.h>
38 #include "socket_server.hxx"
39 #include "t2n_exception.hxx"
47 /** @brief create a new tcp-based server
48 @param port tcp port you want to listen on
49 @param ip the local ip you want to listen on. "0.0.0.0" means all local ips (default).
51 socket_server::socket_server(int port, const std::string& ip)
52 : server(), socket_handler(0,tcp_s)
54 /* Create the socket. */
55 sock = socket (PF_INET, SOCK_STREAM, 0);
57 EXCEPTIONSTREAM(error,t2n_server_error,"error opening socket: " << strerror(errno));
59 set_socket_options(sock);
61 /* Give the socket a name. */
62 struct sockaddr_in sockaddr;
63 sockaddr.sin_family = AF_INET;
64 sockaddr.sin_port = htons(port);
66 if (inet_aton(ip.c_str(),&sockaddr.sin_addr) == 0)
67 EXCEPTIONSTREAM(error,t2n_server_error,"failed listening on invalid ip " << ip);
69 if (bind (sock, (struct sockaddr *) &sockaddr, sizeof (sockaddr)) < 0)
71 // FIXME: Calls virtual function socket_server::get_logstream() in constructor
72 EXCEPTIONSTREAM(error,t2n_server_error,"error binding socket: " << strerror(errno));
78 /** @brief create a new unix-socked-based server
79 @param path path of the socket
80 @param filemode permissions you want to open the socket with
81 @param user local username for the socket
82 @param group local groupname for the socket
84 socket_server::socket_server(const std::string& path, mode_t filemode, const std::string& user, const std::string& group)
85 : server(), socket_handler(0,unix_s)
89 // TODO: Every EXCEPTIONSTREAM in here calls virtual function get_logstream()
91 /* Create the socket. */
92 sock = socket (PF_UNIX, SOCK_STREAM, 0);
94 EXCEPTIONSTREAM(error,t2n_server_error,"error opening socket: " << strerror(errno));
96 set_socket_options(sock);
98 /* Give the socket a name. */
99 struct sockaddr_un unix_name;
100 unix_name.sun_family = AF_UNIX;
101 strncpy (unix_name.sun_path, unix_path.c_str(),sizeof(unix_name.sun_path));
103 /* just to make sure there is no other socket file */
104 unlink (unix_name.sun_path);
106 if (bind (sock, (struct sockaddr *) &unix_name, sizeof (unix_name)) < 0)
107 EXCEPTIONSTREAM(error,t2n_server_error,"error binding socket: " << strerror(errno));
109 /* change permissions */
110 if (chmod (unix_name.sun_path, filemode) != 0)
111 EXCEPTIONSTREAM(error,t2n_server_error,"error changing permission: " << strerror(errno));
113 if (!user.empty() && !group.empty())
115 // TODO maybe use current user/group if one of them is empty
117 struct passwd *socket_user = getpwnam (user.c_str());
118 if (socket_user == NULL)
119 EXCEPTIONSTREAM(error,t2n_server_error,"error getting socket user: " << strerror(errno));
121 struct group *socket_group = getgrnam (group.c_str());
122 if (socket_group == NULL)
123 EXCEPTIONSTREAM(error,t2n_server_error,"error getting socket group: " << strerror(errno));
125 if (chown (unix_name.sun_path, socket_user->pw_uid, socket_group->gr_gid) != 0)
126 EXCEPTIONSTREAM(error,t2n_server_error,"error changing socket ownership: " << strerror(errno));
132 socket_server::~socket_server()
134 socket_handler::close();
136 if (get_type()==unix_s)
137 unlink(unix_path.c_str());
140 /// start listening on a new server socket (called by the constructors)
141 void socket_server::start_listening()
143 if (listen (sock, 5) < 0)
144 EXCEPTIONSTREAM(error,t2n_server_error,"error listening to socket: " << strerror(errno));
146 /* clear & insert server sock into the fd_tab to prepare select */
147 FD_ZERO(&connection_set);
148 FD_SET (sock, &connection_set);
151 /// handle a new connection from a client
152 void socket_server::new_connection()
154 struct sockaddr_un clientname;
156 unsigned int size = sizeof (clientname);
157 int newsock = accept (sock,(struct sockaddr *) &clientname,&size);
160 // return on non-fatal errors (list taken from man-page)
161 if (errno == EAGAIN || errno == EWOULDBLOCK || errno == ECONNABORTED || errno == EINTR ||
162 errno == EMFILE || errno == ENFILE || errno == ENOBUFS || errno == ENOMEM ||
163 errno == EPROTO || errno == EPERM || errno == ETIMEDOUT)
165 LOGSTREAM(error,"non-fatal accept error: " << strerror(errno));
169 /* fatal error: will usually kill or restart the server */
170 EXCEPTIONSTREAM(error,t2n_server_error,"fatal error accepting connection: " << strerror(errno));
173 FD_SET (newsock, &connection_set);
175 socket_server_connection *nc=new socket_server_connection(newsock, get_type(), get_default_timeout());
176 nc->set_socket_options(newsock);
183 /** @brief look for new connections and new data in any of the existing connections
184 @param usec_timeout wait until new data is found, max timeout usecs.
187 @param usec_timeout_remaining if non-NULL the function will write the
188 not used time to the given target
189 @retval true if new data was found (does not mean that the received data
190 is a complete packet though)
192 bool socket_server::fill_buffer(long long usec_timeout,long long* usec_timeout_remaining)
194 fd_set used_fdset=connection_set;
198 struct timeval *timeout_ptr;
200 if (usec_timeout == -1)
206 // timeout von long long usec in int sec + int usec umrechnen
207 tval.tv_sec = usec_timeout / 1000000;
208 tval.tv_usec = usec_timeout % 1000000;
211 int ret=select (FD_SETSIZE, &used_fdset, NULL, NULL, timeout_ptr);
213 // return the timeout we did not use
214 if (usec_timeout > 0 && usec_timeout_remaining != NULL)
215 *usec_timeout_remaining=(tval.tv_sec*1000000)+tval.tv_usec;
221 // select interrupted by signal
225 EXCEPTIONSTREAM(error,t2n_server_error,"select error: " << strerror(errno));
230 // we have data pending
232 // check for new connection
233 if (FD_ISSET (sock, &used_fdset))
238 // check all connections for pending data
239 return fill_connection_buffers();
245 /// call fill_buffer() on all connections, called from fill_buffer()
246 bool socket_server::fill_connection_buffers()
248 bool data_found = false;
250 std::map<unsigned int, server_connection*>::iterator ie=connections.end();
251 for(std::map<unsigned int, server_connection*>::iterator i=connections.begin(); i != ie; i++)
252 if (!i->second->server_connection::is_closed())
254 // shutdown all connections which throw exceptions to protect the server
257 if (i->second->fill_buffer(0))
260 catch (t2n_transfer_error &e)
261 { i->second->close(); }
269 /// remove the socket of a connection after the connection has been closed
270 void socket_server::remove_connection_socket(int sock)
272 FD_CLR(sock, &connection_set);
275 /// close this connection. complete data waiting in the buffer can still be retrieved.
276 void socket_server_connection::close()
278 if (!server_connection::is_closed())
280 socket_handler::close();
281 server_connection::close();
286 dynamic_cast<socket_server*>(my_server)->remove_connection_socket(sock);