389 lines
9.1 KiB
C
389 lines
9.1 KiB
C
/*
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* ngIRCd -- The Next Generation IRC Daemon
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* Copyright (c)2001 by Alexander Barton (alex@barton.de)
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*
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* Dieses Programm ist freie Software. Sie koennen es unter den Bedingungen
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* der GNU General Public License (GPL), wie von der Free Software Foundation
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* herausgegeben, weitergeben und/oder modifizieren, entweder unter Version 2
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* der Lizenz oder (wenn Sie es wuenschen) jeder spaeteren Version.
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* Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
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* der an comBase beteiligten Autoren finden Sie in der Datei AUTHORS.
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*
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* $Id: conn.c,v 1.5 2001/12/14 08:16:47 alex Exp $
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*
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* connect.h: Verwaltung aller Netz-Verbindungen ("connections")
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*
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* $Log: conn.c,v $
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* Revision 1.5 2001/12/14 08:16:47 alex
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* - Begonnen, Client-spezifische Lesepuffer zu implementieren.
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* - Umstellung auf Datentyp "CONN_ID".
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*
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* Revision 1.4 2001/12/13 02:04:16 alex
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* - boesen "Speicherschiesser" in Log() gefixt.
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*
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* Revision 1.3 2001/12/13 01:33:09 alex
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* - Conn_Handler() unterstuetzt nun einen Timeout.
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* - fuer Verbindungen werden keine FILE-Handles mehr benutzt.
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* - kleinere "Code Cleanups" ;-)
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*
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* Revision 1.2 2001/12/12 23:32:02 alex
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* - diverse Erweiterungen und Verbesserungen (u.a. sind nun mehrere
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* Verbindungen und Listen-Sockets moeglich).
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*
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* Revision 1.1 2001/12/12 17:18:38 alex
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* - Modul zur Verwaltung aller Netzwerk-Verbindungen begonnen.
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*/
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#include <portab.h>
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#include "global.h"
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#include <imp.h>
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#include <assert.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#ifdef HAVE_STDINT_H
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#include <stdint.h> /* u.a. fuer Mac OS X */
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#endif
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#include "ngircd.h"
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#include "log.h"
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#include "tool.h"
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#include <exp.h>
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#include "conn.h"
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#define MAX_CONNECTIONS 100 /* max. Anzahl von Verbindungen an diesem Server */
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#define LINE_LEN 512 /* Laenge eines Befehls, vgl. RFC 2812, 3.2 */
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#define BUFFER_LEN 2 * LINE_LEN; /* Laenge des Lesepuffers je Verbindung */
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typedef struct _Connection
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{
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INT sock; /* Socket Handle */
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struct sockaddr_in addr; /* Adresse des Client */
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CHAR buffer[BUFFER_LEN]; /* Lesepuffer */
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INT datalen; /* Laenge der Daten im Puffer */
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} CONNECTION;
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LOCAL VOID Handle_Socket( INT sock );
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LOCAL VOID New_Connection( INT Sock );
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LOCAL CONN_ID Socket2Index( INT Sock );
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LOCAL VOID Close_Connection( CONN_ID Idx );
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LOCAL VOID Read_Request( CONN_ID Idx );
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LOCAL BOOLEAN Send( CONN_ID Idx, CHAR *Data );
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LOCAL fd_set My_Listener;
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LOCAL fd_set My_Sockets;
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LOCAL INT My_Max_Fd;
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LOCAL CONNECTION My_Connections[MAX_CONNECTIONS];
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GLOBAL VOID Conn_Init( VOID )
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{
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CONN_ID i;
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/* zu Beginn haben wir keine Verbindungen */
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FD_ZERO( &My_Listener );
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FD_ZERO( &My_Sockets );
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My_Max_Fd = 0;
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/* Connection-Struktur initialisieren */
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for( i = 0; i < MAX_CONNECTIONS; i++ )
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{
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My_Connections[i].sock = NONE;
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My_Connections[i].datalen = 0;
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}
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} /* Conn_Init */
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GLOBAL VOID Conn_Exit( VOID )
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{
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CONN_ID idx;
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INT i;
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/* Sockets schliessen */
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for( i = 0; i < My_Max_Fd + 1; i++ )
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{
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if( FD_ISSET( i, &My_Sockets ))
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{
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for( idx = 0; idx < MAX_CONNECTIONS; idx++ )
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{
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if( My_Connections[idx].sock == i ) break;
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}
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if( idx < MAX_CONNECTIONS ) Close_Connection( idx );
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else if( FD_ISSET( i, &My_Listener ))
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{
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close( i );
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Log( LOG_INFO, "Closed listening socket %d.", i );
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}
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else
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{
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close( i );
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Log( LOG_WARNING, "Unknown connection %d closed.", i );
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}
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}
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}
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} /* Conn_Exit */
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GLOBAL BOOLEAN Conn_New_Listener( CONST INT Port )
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{
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/* Neuen Listen-Socket erzeugen: der Server wartet dann
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* auf dem angegebenen Port auf Verbindungen. */
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struct sockaddr_in addr;
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INT sock, on = 1;
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/* Server-"Listen"-Socket initialisieren */
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memset( &addr, 0, sizeof( addr ));
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addr.sin_family = AF_INET;
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addr.sin_port = htons( Port );
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addr.sin_addr.s_addr = htonl( INADDR_ANY );
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/* Socket erzeugen */
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sock = socket( PF_INET, SOCK_STREAM, 0);
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if( sock < 0 )
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{
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Log( LOG_ALERT, "Can't create socket: %s", strerror( errno ));
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return FALSE;
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}
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/* Socket-Optionen setzen */
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if( fcntl( sock, F_SETFL, O_NONBLOCK ) != 0 )
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{
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Log( LOG_ALERT, "Can't enable non-blocking mode: %s", strerror( errno ));
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close( sock );
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return FALSE;
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}
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if( setsockopt( sock, SOL_SOCKET, SO_REUSEADDR, &on, (socklen_t)sizeof( on )) != 0)
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{
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Log( LOG_CRIT, "Can't set socket options: %s", strerror( errno ));
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/* dieser Fehler kann ignoriert werden. */
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}
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/* an Port binden */
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if( bind( sock, (struct sockaddr *)&addr, (socklen_t)sizeof( addr )) != 0 )
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{
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Log( LOG_ALERT, "Can't bind socket: %s", strerror( errno ));
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close( sock );
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return FALSE;
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}
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/* in "listen mode" gehen :-) */
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if( listen( sock, 10 ) != 0 )
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{
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Log( LOG_ALERT, "Can't listen on soecket: %s", strerror( errno ));
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close( sock );
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return FALSE;
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}
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/* Neuen Listener in Strukturen einfuegen */
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FD_SET( sock, &My_Listener );
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FD_SET( sock, &My_Sockets );
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if( sock > My_Max_Fd ) My_Max_Fd = sock;
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Log( LOG_INFO, "Now listening on port %d, socket %d.", Port, sock );
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return TRUE;
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} /* Conn_New_Listener */
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GLOBAL VOID Conn_Handler( INT Timeout )
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{
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fd_set read_sockets;
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struct timeval tv;
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INT i;
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/* Timeout initialisieren */
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tv.tv_sec = Timeout;
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tv.tv_usec = 0;
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read_sockets = My_Sockets;
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if( select( My_Max_Fd + 1, &read_sockets, NULL, NULL, &tv ) == -1 )
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{
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if( errno != EINTR ) Log( LOG_ALERT, "select(): %s", strerror( errno ));
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return;
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}
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for( i = 0; i < My_Max_Fd + 1; i++ )
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{
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if( FD_ISSET( i, &read_sockets )) Handle_Socket( i );
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}
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} /* Conn_Handler */
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LOCAL VOID Handle_Socket( INT Sock )
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{
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/* Aktivitaet auf einem Socket verarbeiten */
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CONN_ID idx;
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if( FD_ISSET( Sock, &My_Listener ))
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{
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/* es ist einer unserer Listener-Sockets: es soll
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* also eine neue Verbindung aufgebaut werden. */
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New_Connection( Sock );
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}
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else
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{
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/* Ein Client Socket: entweder ein User oder Server */
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idx = Socket2Index( Sock );
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Read_Request( idx );
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}
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} /* Handle_Socket */
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LOCAL VOID New_Connection( INT Sock )
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{
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struct sockaddr_in new_addr;
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INT new_sock, new_sock_len;
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CONN_ID idx;
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new_sock_len = sizeof( new_addr );
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new_sock = accept( Sock, (struct sockaddr *)&new_addr, (socklen_t *)&new_sock_len );
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if( new_sock < 0 )
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{
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Log( LOG_CRIT, "Can't accept connection: %s", strerror( errno ));
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return;
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}
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/* Freie Connection-Struktur suschen */
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for( idx = 0; idx < MAX_CONNECTIONS; idx++ ) if( My_Connections[idx].sock < 0 ) break;
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if( idx >= MAX_CONNECTIONS )
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{
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Log( LOG_ALERT, "Can't accept connection: limit (%d) reached!", MAX_CONNECTIONS );
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close( new_sock );
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return;
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}
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/* Verbindung registrieren */
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My_Connections[idx].sock = new_sock;
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My_Connections[idx].addr = new_addr;
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/* Neuen Socket registrieren */
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FD_SET( new_sock, &My_Sockets );
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if( new_sock > My_Max_Fd ) My_Max_Fd = new_sock;
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Send( idx, "hello world!\n" );
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Log( LOG_INFO, "Accepted connection from %s:%d on socket %d.", inet_ntoa( new_addr.sin_addr ), ntohs( new_addr.sin_port), Sock );
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} /* New_Connection */
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LOCAL CONN_ID Socket2Index( INT Sock )
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{
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CONN_ID idx;
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for( idx = 0; idx < MAX_CONNECTIONS; idx++ ) if( My_Connections[idx].sock == Sock ) break;
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assert( idx < MAX_CONNECTIONS );
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return idx;
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} /* Socket2Index */
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LOCAL VOID Close_Connection( CONN_ID Idx )
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{
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/* Verbindung schlie<69>en */
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assert( My_Connections[Idx].sock >= 0 );
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if( close( My_Connections[Idx].sock ) != 0 )
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{
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Log( LOG_ERR, "Error closing connection with %s:%d - %s", inet_ntoa( My_Connections[Idx].addr.sin_addr ), ntohs( My_Connections[Idx].addr.sin_port), strerror( errno ));
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}
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else
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{
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Log( LOG_INFO, "Closed connection with %s:%d.", inet_ntoa( My_Connections[Idx].addr.sin_addr ), ntohs( My_Connections[Idx].addr.sin_port ));
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}
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FD_CLR( My_Connections[Idx].sock, &My_Sockets );
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My_Connections[Idx].sock = NONE;
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} /* Close_Connection */
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LOCAL VOID Read_Request( CONN_ID Idx )
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{
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/* Daten von Socket einlesen und entsprechend behandeln.
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* Tritt ein Fehler auf, so wird der Socket geschlossen. */
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INT len;
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len = recv( My_Connections[Idx].sock, My_Connection[Idx].buffer + My_Connection[Idx].datalen, BUFFER_LEN - My_Connection[Idx].datalen - 1, 0 );
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My_Connection[Idx].buffer[BUFFER_LEN] = '\0';
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if( len == 0 )
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{
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/* Socket wurde geschlossen */
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Close_Connection( Idx );
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return;
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}
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if( len < 0 )
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{
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/* Fehler beim Lesen */
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Log( LOG_ALERT, "Read error on socket %d!", My_Connections[Idx].sock );
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Close_Connection( Idx );
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return;
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}
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My_Connection[Idx].datalen += len;
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ngt_Trim_Str( buffer );
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printf( " in: '%s'\n", buffer );
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} /* Read_Data */
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LOCAL BOOLEAN Send( CONN_ID Idx, CHAR *Data )
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{
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/* Daten in Socket schreiben, ggf. in mehreren Stuecken. Tritt
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* ein Fehler auf, so wird die Verbindung beendet und FALSE
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* als Rueckgabewert geliefert. */
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INT n, sent, len;
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sent = 0;
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len = strlen( Data );
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while( sent < len )
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{
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n = send( My_Connections[Idx].sock, Data + sent, len - sent, 0 );
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if( n <= 0 )
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{
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/* Oops, ein Fehler! */
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Log( LOG_ALERT, "Write error on socket %d!", My_Connections[Idx].sock );
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Close_Connection( Idx );
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return FALSE;
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}
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sent += n;
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}
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return TRUE;
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} /* Send */
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/* -eof- */
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