- asyncronen Resolver (IP->Name) implementiert, dadurch div. Aenderungen.
This commit is contained in:
Alexander Barton
parent
ec1922efca
commit
4a111033fa
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@ -9,11 +9,14 @@
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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 1.17 2001/12/29 03:06:16 alex Exp $
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* $Id: conn.c,v 1.18 2001/12/29 20:17:25 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 1.18 2001/12/29 20:17:25 alex
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* - asyncronen Resolver (IP->Name) implementiert, dadurch div. Aenderungen.
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*
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* Revision 1.17 2001/12/29 03:06:16 alex
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* - Loglevel (nochmal) angepasst.
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*
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@ -93,6 +96,7 @@
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#include <time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.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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@ -116,11 +120,23 @@
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#define READBUFFER_LEN 2 * MAX_CMDLEN /* Laenge des Lesepuffers je Verbindung (Bytes) */
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#define WRITEBUFFER_LEN 4096 /* Laenge des Schreibpuffers je Verbindung (Bytes) */
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#define HOST_LEN 256 /* max. Laenge eines Hostnamen */
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typedef struct _Res_Stat
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{
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INT pid; /* PID des Child-Prozess */
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INT out_pipe[2]; /* Pipe fuer IPC: zum Client */
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INT in_pipe[2]; /* Pipe fuer IPC: vom Client */
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} RES_STAT;
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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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RES_STAT *res_stat; /* "Resolver-Status", s.o. */
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CHAR host[HOST_LEN]; /* Hostname */
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CHAR rbuf[READBUFFER_LEN + 1]; /* Lesepuffer */
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INT rdatalen; /* Laenge der Daten im Lesepuffer */
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CHAR wbuf[WRITEBUFFER_LEN + 1]; /* Schreibpuffer */
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@ -138,10 +154,16 @@ LOCAL VOID Read_Request( CONN_ID Idx );
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LOCAL BOOLEAN Try_Write( CONN_ID Idx );
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LOCAL VOID Handle_Buffer( CONN_ID Idx );
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LOCAL VOID Check_Connections( VOID );
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LOCAL VOID Init_Conn_Struct( INT Idx );
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LOCAL RES_STAT *Resolve( CHAR *Host );
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LOCAL VOID Do_Resolve( INT r_fd, INT w_fd );
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LOCAL VOID Read_Resolver_Result( INT r_fd );
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LOCAL fd_set My_Listener;
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LOCAL fd_set My_Listeners;
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LOCAL fd_set My_Sockets;
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LOCAL fd_set My_Resolvers;
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LOCAL INT My_Max_Fd;
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@ -153,13 +175,14 @@ GLOBAL VOID Conn_Init( VOID )
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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_Listeners );
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FD_ZERO( &My_Sockets );
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FD_ZERO( &My_Resolvers );
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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++ ) My_Connections[i].sock = NONE;
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for( i = 0; i < MAX_CONNECTIONS; i++ ) Init_Conn_Struct( i );
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} /* Conn_Init */
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@ -178,7 +201,7 @@ GLOBAL VOID Conn_Exit( VOID )
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if( My_Connections[idx].sock == i ) break;
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}
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if( idx < MAX_CONNECTIONS ) Conn_Close( idx, "Server going down ..." );
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else if( FD_ISSET( i, &My_Listener ))
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else if( FD_ISSET( i, &My_Listeners ))
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{
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close( i );
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Log( LOG_INFO, "Listening socket %d closed.", i );
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@ -245,7 +268,7 @@ GLOBAL BOOLEAN Conn_NewListener( CONST INT Port )
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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_Listeners );
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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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@ -292,8 +315,27 @@ GLOBAL VOID Conn_Handler( INT Timeout )
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FD_SET( My_Connections[i].sock, &write_sockets );
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}
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}
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/* von welchen Sockets koennte gelesen werden? */
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read_sockets = My_Sockets;
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for( i = 0; i < MAX_CONNECTIONS; i++ )
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{
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if(( My_Connections[i].sock >= 0 ) && ( My_Connections[i].host[0] == '\0' ))
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{
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/* Hier muss noch auf den Resolver Sub-Prozess gewartet werden */
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FD_CLR( My_Connections[i].sock, &read_sockets );
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}
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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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/* Pipes von Resolver Sub-Prozessen aufnehmen */
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if( FD_ISSET( i, &My_Resolvers ))
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{
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FD_SET( i, &read_sockets );
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}
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}
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/* Auf Aktivitaet warten */
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if( select( My_Max_Fd + 1, &read_sockets, &write_sockets, 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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@ -406,6 +448,17 @@ GLOBAL VOID Conn_Close( CONN_ID Idx, CHAR *Msg )
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Client_Destroy( Client_GetFromConn( Idx ));
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if( My_Connections[Idx].res_stat )
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{
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/* Resolver-Strukturen freigeben, wenn noch nicht geschehen */
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FD_CLR( My_Connections[Idx].res_stat->in_pipe[0], &My_Resolvers );
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close( My_Connections[Idx].res_stat->out_pipe[0] );
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close( My_Connections[Idx].res_stat->out_pipe[1] );
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close( My_Connections[Idx].res_stat->in_pipe[0] );
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close( My_Connections[Idx].res_stat->in_pipe[1] );
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free( My_Connections[Idx].res_stat );
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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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} /* Conn_Close */
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@ -447,14 +500,20 @@ LOCAL VOID Handle_Read( INT Sock )
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CONN_ID idx;
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assert( Sock >= 0 );
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if( FD_ISSET( Sock, &My_Listener ))
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if( FD_ISSET( Sock, &My_Listeners ))
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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 if( FD_ISSET( Sock, &My_Resolvers ))
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{
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/* Rueckmeldung von einem Resolver Sub-Prozess */
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Read_Resolver_Result( 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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@ -500,6 +559,7 @@ LOCAL VOID New_Connection( INT Sock )
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struct sockaddr_in new_addr;
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INT new_sock, new_sock_len;
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RES_STAT *s;
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CONN_ID idx;
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assert( Sock >= 0 );
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@ -530,19 +590,28 @@ LOCAL VOID New_Connection( INT Sock )
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}
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/* Verbindung registrieren */
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Init_Conn_Struct( idx );
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My_Connections[idx].sock = new_sock;
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My_Connections[idx].addr = new_addr;
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My_Connections[idx].rdatalen = 0;
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My_Connections[idx].wdatalen = 0;
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My_Connections[idx].lastdata = time( NULL );
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My_Connections[idx].lastping = 0;
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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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Log( LOG_NOTICE, "Accepted connection %d from %s:%d on socket %d.", idx, inet_ntoa( new_addr.sin_addr ), ntohs( new_addr.sin_port), Sock );
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/* Hostnamen ermitteln */
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s = Resolve( inet_ntoa( new_addr.sin_addr ));
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if( s )
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{
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/* Sub-Prozess wurde asyncron gestartet */
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My_Connections[idx].res_stat = s;
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}
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else
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{
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/* kann Namen nicht aufloesen */
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strcpy( My_Connections[idx].host, inet_ntoa( new_addr.sin_addr ));
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}
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} /* New_Connection */
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@ -684,4 +753,180 @@ LOCAL VOID Check_Connections( VOID )
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} /* Conn_Check */
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LOCAL VOID Init_Conn_Struct( INT Idx )
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{
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/* Connection-Struktur initialisieren */
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My_Connections[Idx].sock = NONE;
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My_Connections[Idx].res_stat = NULL;
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My_Connections[Idx].host[0] = '\0';
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My_Connections[Idx].rbuf[0] = '\0';
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My_Connections[Idx].rdatalen = 0;
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My_Connections[Idx].wbuf[0] = '\0';
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My_Connections[Idx].wdatalen = 0;
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My_Connections[Idx].lastdata = time( NULL );
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My_Connections[Idx].lastping = 0;
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} /* Init_Conn_Struct */
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LOCAL RES_STAT *Resolve( CHAR *Host )
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{
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/* Hostnamen (asyncron!) aufloesen. Bei Fehler, z.B. wenn der
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* Child-Prozess nicht erzeugt werden kann, wird NULL geliefert.
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* Der Host kann dann nicht aufgeloest werden. */
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RES_STAT *s;
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INT pid;
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s = malloc( sizeof( RES_STAT ));
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if( ! s )
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{
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Log( LOG_ALERT, "Resolver: Can't alloc memory!" );
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return NULL;
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}
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if( pipe( s->out_pipe ) != 0 )
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{
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free( s );
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Log( LOG_ALERT, "Resolver: Can't create output pipe: %s!", strerror( errno ));
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return NULL;
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}
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if( pipe( s->in_pipe ) != 0 )
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{
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free( s );
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Log( LOG_ALERT, "Resolver: Can't create input pipe: %s!", strerror( errno ));
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return NULL;
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}
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pid = fork( );
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if( pid > 0 )
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{
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/* Haupt-Prozess */
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if( write( s->out_pipe[1], Host, strlen( Host ) + 1 ) != ( strlen( Host ) + 1 ))
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{
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free( s );
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Log( LOG_ALERT, "Resolver: Can't write to child: %s!", strerror( errno ));
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return NULL;
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}
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FD_SET( s->in_pipe[0], &My_Resolvers );
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if( s->in_pipe[0] > My_Max_Fd ) My_Max_Fd = s->in_pipe[0];
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s->pid = pid;
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Log( LOG_DEBUG, "Resolver process for \"%s\" (PID %d) created.", Host, pid );
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return s;
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}
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else if( pid == 0 )
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{
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/* Sub-Prozess */
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Log_Init_Resolver( );
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Do_Resolve( s->out_pipe[0], s->in_pipe[1] );
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Log_Exit_Resolver( );
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exit( 0 );
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}
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else
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{
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/* Fehler */
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free( s );
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Log( LOG_ALERT, "Resolver: Can't fork: %s!", strerror( errno ));
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return NULL;
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}
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} /* Resolve */
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LOCAL VOID Read_Resolver_Result( INT r_fd )
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{
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/* Ergebnis von Resolver Sub-Prozess aus Pipe lesen
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* und entsprechende Connection aktualisieren */
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CHAR hostname[HOST_LEN];
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CLIENT *c;
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INT i;
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FD_CLR( r_fd, &My_Resolvers );
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/* Anfrage vom Parent lesen */
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if( read( r_fd, hostname, HOST_LEN) < 0 )
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{
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/* Fehler beim Lesen aus der Pipe */
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close( r_fd );
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Log( LOG_ALERT, "Resolver: Can't read result: %s!", strerror( errno ));
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return;
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}
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for( i = 0; i < MAX_CONNECTIONS; i++ )
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{
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/* zugehoerige Connection suchen */
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if(( My_Connections[i].sock >= 0 ) && ( My_Connections[i].res_stat ) && ( My_Connections[i].res_stat->in_pipe[0] == r_fd )) break;
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}
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if( i >= MAX_CONNECTIONS )
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{
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/* Opsa! Keine passende Connection gefunden!? */
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close( r_fd );
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Log( LOG_ALERT, "Resolver: Got result for unknown connection!?" );
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return;
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}
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/* Aufraeumen */
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close( My_Connections[i].res_stat->out_pipe[0] );
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close( My_Connections[i].res_stat->out_pipe[1] );
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close( My_Connections[i].res_stat->in_pipe[0] );
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close( My_Connections[i].res_stat->in_pipe[1] );
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free( My_Connections[i].res_stat );
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My_Connections[i].res_stat = NULL;
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/* Hostnamen setzen */
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strcpy( My_Connections[i].host, hostname );
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c = Client_GetFromConn( i );
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if( c )
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{
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Log( LOG_DEBUG, "Set hostname: \"%s\".", hostname );
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Client_SetHostname( c, hostname );
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}
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} /* Read_Resolver_Result */
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LOCAL VOID Do_Resolve( INT r_fd, INT w_fd )
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{
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/* Resolver Sub-Prozess: aufzuloesenden Namen aus
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* der Pipe lesen, Ergebnis in Pipe schreiben. */
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CHAR host[HOST_LEN], res_host[HOST_LEN];
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struct hostent *h;
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/* Anfrage vom Parent lesen */
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if( read( r_fd, host, HOST_LEN) < 0 )
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{
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Log_Resolver( LOG_ALERT, "Resolver: Can't read from parent: %s!", strerror( errno ));
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close( r_fd ); close( w_fd );
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return;
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}
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host[HOST_LEN] = '\0';
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Log_Resolver( LOG_DEBUG, "Now resolving \"%s\" ...", host );
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/* Namen aufloesen */
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h = gethostbyname( host );
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if( h ) strcpy( res_host, h->h_name );
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else
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{
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Log_Resolver( LOG_WARNING, "Can't resolce host name (code %d)!", h_errno );
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strcpy( res_host, host );
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}
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/* Antwort an Parent schreiben */
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if( write( w_fd, res_host, strlen( res_host ) + 1 ) != ( strlen( res_host ) + 1 ))
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{
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Log_Resolver( LOG_ALERT, "Resolver: Can't write to parent: %s!", strerror( errno ));
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close( r_fd ); close( w_fd );
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return;
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}
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Log_Resolver( LOG_DEBUG, "Ok, translated \"%s\" to \"%s\".", host, res_host );
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} /* Do_Resolve */
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/* -eof- */
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