X-Git-Url: http://developer.intra2net.com/git/?p=libt2n;a=blobdiff_plain;f=src%2Fsocket_server.cpp;h=d6ca43960e569ea8ae1a3304a488674249e6d90b;hp=87025d8718197f60e5b7511b1e989ad9c39f3ab0;hb=6f59dcf596103d0bc69be841627cd9926faa4139;hpb=9424729586fdb0aabb671d2f1266bdb07e0bed38 diff --git a/src/socket_server.cpp b/src/socket_server.cpp index 87025d8..d6ca439 100644 --- a/src/socket_server.cpp +++ b/src/socket_server.cpp @@ -1,21 +1,24 @@ -/*************************************************************************** - * 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 #include @@ -25,6 +28,7 @@ #include #include #include +#include #include #include #include @@ -37,6 +41,7 @@ #include "socket_server.hxx" #include "t2n_exception.hxx" +#include "log.hxx" using namespace std; @@ -50,7 +55,28 @@ namespace libt2n socket_server::socket_server(int port, const std::string& ip) : server(), socket_handler(0,tcp_s) { - // TODO + /* 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(); } /** @brief create a new unix-socked-based server @@ -64,15 +90,12 @@ socket_server::socket_server(const std::string& path, mode_t filemode, const std { 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); @@ -85,21 +108,11 @@ socket_server::socket_server(const std::string& path, mode_t filemode, const std 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)); if (!user.empty() && !group.empty()) { @@ -107,52 +120,55 @@ socket_server::socket_server(const std::string& path, mode_t filemode, const std struct passwd *socket_user = getpwnam (user.c_str()); if (socket_user == NULL) - { - string err="error getting socket user: "; - err+=strerror(errno); - log(error, err); - throw t2n_server_error(err); - } - + EXCEPTIONSTREAM(error,t2n_server_error,"error getting socket user: " << strerror(errno)); + struct group *socket_group = getgrnam (group.c_str()); if (socket_group == NULL) - { - string err="error getting socket group: "; - 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) - { - string err="error changing socket ownership: "; - err+=strerror(errno); - log(error, err); - throw t2n_server_error(err); - } - } + 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(); } +/** + * Destructor + */ socket_server::~socket_server() { - socket_handler::close(); + // close all client connections + server::close(); + + // server socket will be closed by destructor of socket_handler if (get_type()==unix_s) unlink(unix_path.c_str()); + + // disconnect connection<->server pointer + std::map::iterator it, it_end = connections.end(); + for (it = connections.begin(); it != it_end; ++it) + { + socket_server_connection *conn = dynamic_cast(it->second); + if (conn) + conn->my_server = NULL; + } +} + +/// start listening on a new server socket (called by the constructors) +void socket_server::start_listening() +{ + if (listen (sock, 5) < 0) + EXCEPTIONSTREAM(error,t2n_server_error,"error listening to socket: " << strerror(errno)); + + /* clear & insert server sock into the fd_tab to prepare select */ + FD_ZERO(&connection_set); + FD_SET (sock, &connection_set); + sockets_set.insert(sock); } +/// handle a new connection from a client void socket_server::new_connection() { struct sockaddr_un clientname; @@ -161,20 +177,21 @@ void socket_server::new_connection() 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); + sockets_set.insert(newsock); socket_server_connection *nc=new socket_server_connection(newsock, get_type(), get_default_timeout()); nc->set_socket_options(newsock); @@ -184,7 +201,16 @@ void socket_server::new_connection() return; } -bool 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; @@ -205,6 +231,10 @@ bool socket_server::fill_buffer(long long usec_timeout) 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) @@ -213,12 +243,7 @@ bool socket_server::fill_buffer(long long usec_timeout) 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) @@ -238,46 +263,72 @@ bool socket_server::fill_buffer(long long usec_timeout) return false; } +/// call fill_buffer() on all connections, called from fill_buffer() bool socket_server::fill_connection_buffers() { - bool data_found; + bool data_found = false; std::map::iterator ie=connections.end(); for(std::map::iterator i=connections.begin(); i != ie; i++) if (!i->second->server_connection::is_closed()) - if (i->second->fill_buffer(0)) - data_found=true; + { + // 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(); } + } return data_found; } +/// 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); + sockets_set.erase(sock); } -void socket_server_connection::log(log_level_values level, const char* message) +/** + * Destructor + */ +socket_server_connection::~socket_server_connection() { - if(my_server) + // 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) { - ostringstream msg; - msg << "connection id " << get_id() << ": " << message; - my_server->log(level,msg.str().c_str()); + socket_server *srv = dynamic_cast(my_server); + if (srv) + srv->remove_connection_socket(sock); } } +/// close this connection. complete data waiting in the buffer can still be retrieved. void socket_server_connection::close() { - if (!server_connection::is_closed()) + if (my_server && sock != -1) { - socket_handler::close(); - server_connection::close(); + socket_server *srv = dynamic_cast(my_server); + if (srv) + srv->remove_connection_socket(sock); } - if (my_server) + if (!server_connection::is_closed()) { - dynamic_cast(my_server)->remove_connection_socket(sock); + socket_handler::close(); + server_connection::close(); } } +bool socket_server_connection::fill_buffer(long long usec_timeout,long long* usec_timeout_remaining) +{ + bool new_data = socket_handler::fill_buffer(buffer,usec_timeout,usec_timeout_remaining); + if (new_data) + reset_timeout(); + return new_data; +} }