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)
70 EXCEPTIONSTREAM(error,t2n_server_error,"error binding socket: " << strerror(errno));
75 /** @brief create a new unix-socked-based server
76 @param path path of the socket
77 @param filemode permissions you want to open the socket with
78 @param user local username for the socket
79 @param group local groupname for the socket
81 socket_server::socket_server(const std::string& path, mode_t filemode, const std::string& user, const std::string& group)
82 : server(), socket_handler(0,unix_s)
86 /* Create the socket. */
87 sock = socket (PF_UNIX, SOCK_STREAM, 0);
89 EXCEPTIONSTREAM(error,t2n_server_error,"error opening socket: " << strerror(errno));
91 set_socket_options(sock);
93 /* Give the socket a name. */
94 struct sockaddr_un unix_name;
95 unix_name.sun_family = AF_UNIX;
96 strncpy (unix_name.sun_path, unix_path.c_str(),sizeof(unix_name.sun_path));
98 /* just to make sure there is no other socket file */
99 unlink (unix_name.sun_path);
101 if (bind (sock, (struct sockaddr *) &unix_name, sizeof (unix_name)) < 0)
102 EXCEPTIONSTREAM(error,t2n_server_error,"error binding socket: " << strerror(errno));
104 /* change permissions */
105 if (chmod (unix_name.sun_path, filemode) != 0)
106 EXCEPTIONSTREAM(error,t2n_server_error,"error changing permission: " << strerror(errno));
108 if (!user.empty() && !group.empty())
110 // TODO maybe use current user/group if one of them is empty
112 struct passwd *socket_user = getpwnam (user.c_str());
113 if (socket_user == NULL)
114 EXCEPTIONSTREAM(error,t2n_server_error,"error getting socket user: " << strerror(errno));
116 struct group *socket_group = getgrnam (group.c_str());
117 if (socket_group == NULL)
118 EXCEPTIONSTREAM(error,t2n_server_error,"error getting socket group: " << strerror(errno));
120 if (chown (unix_name.sun_path, socket_user->pw_uid, socket_group->gr_gid) != 0)
121 EXCEPTIONSTREAM(error,t2n_server_error,"error changing socket ownership: " << strerror(errno));
127 socket_server::~socket_server()
129 socket_handler::close();
131 if (get_type()==unix_s)
132 unlink(unix_path.c_str());
135 /// start listening on a new server socket (called by the constructors)
136 void socket_server::start_listening()
138 if (listen (sock, 5) < 0)
139 EXCEPTIONSTREAM(error,t2n_server_error,"error listening to socket: " << strerror(errno));
141 /* clear & insert server sock into the fd_tab to prepare select */
142 FD_ZERO(&connection_set);
143 FD_SET (sock, &connection_set);
146 /// handle a new connection from a client
147 void socket_server::new_connection()
149 struct sockaddr_un clientname;
151 unsigned int size = sizeof (clientname);
152 int newsock = accept (sock,(struct sockaddr *) &clientname,&size);
155 // return on non-fatal errors (list taken from man-page)
156 if (errno == EAGAIN || errno == EWOULDBLOCK || errno == ECONNABORTED || errno == EINTR ||
157 errno == EMFILE || errno == ENFILE || errno == ENOBUFS || errno == ENOMEM ||
158 errno == EPROTO || errno == EPERM || errno == ETIMEDOUT)
160 LOGSTREAM(error,"non-fatal accept error: " << strerror(errno));
164 /* fatal error: will usually kill or restart the server */
165 EXCEPTIONSTREAM(error,t2n_server_error,"fatal error accepting connection: " << strerror(errno));
168 FD_SET (newsock, &connection_set);
170 socket_server_connection *nc=new socket_server_connection(newsock, get_type(), get_default_timeout());
171 nc->set_socket_options(newsock);
178 /** @brief look for new connections and new data in any of the existing connections
179 @param usec_timeout wait until new data is found, max timeout usecs.
182 @param usec_timeout_remaining if non-NULL the function will write the
183 not used time to the given target
184 @retval true if new data was found (does not mean that the received data
185 is a complete packet though)
187 bool socket_server::fill_buffer(long long usec_timeout,long long* usec_timeout_remaining)
189 fd_set used_fdset=connection_set;
193 struct timeval *timeout_ptr;
195 if (usec_timeout == -1)
201 // timeout von long long usec in int sec + int usec umrechnen
202 tval.tv_sec = usec_timeout / 1000000;
203 tval.tv_usec = usec_timeout % 1000000;
206 int ret=select (FD_SETSIZE, &used_fdset, NULL, NULL, timeout_ptr);
208 // return the timeout we did not use
209 if (usec_timeout > 0 && usec_timeout_remaining != NULL)
210 *usec_timeout_remaining=(tval.tv_sec*1000000)+tval.tv_usec;
216 // select interrupted by signal
220 EXCEPTIONSTREAM(error,t2n_server_error,"select error: " << strerror(errno));
225 // we have data pending
227 // check for new connection
228 if (FD_ISSET (sock, &used_fdset))
233 // check all connections for pending data
234 return fill_connection_buffers();
240 /// call fill_buffer() on all connections, called from fill_buffer()
241 bool socket_server::fill_connection_buffers()
245 std::map<unsigned int, server_connection*>::iterator ie=connections.end();
246 for(std::map<unsigned int, server_connection*>::iterator i=connections.begin(); i != ie; i++)
247 if (!i->second->server_connection::is_closed())
249 // shutdown all connections which throw exceptions to protect the server
252 if (i->second->fill_buffer(0))
255 catch (t2n_transfer_error &e)
256 { i->second->close(); }
264 /// remove the socket of a connection after the connection has been closed
265 void socket_server::remove_connection_socket(int sock)
267 FD_CLR(sock, &connection_set);
270 /// close this connection. complete data waiting in the buffer can still be retrieved.
271 void socket_server_connection::close()
273 if (!server_connection::is_closed())
275 socket_handler::close();
276 server_connection::close();
281 dynamic_cast<socket_server*>(my_server)->remove_connection_socket(sock);