ngircd-tor/src/ngircd/conn.c

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/*
* ngIRCd -- The Next Generation IRC Daemon
* Copyright (c)2001-2007 Alexander Barton (alex@barton.de)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* Please read the file COPYING, README and AUTHORS for more information.
*
* Connection management
*/
#define CONN_MODULE
#include "portab.h"
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#include "io.h"
static char UNUSED id[] = "$Id: conn.c,v 1.209 2007/05/17 23:34:24 alex Exp $";
#include "imp.h"
#include <assert.h>
#ifdef PROTOTYPES
# include <stdarg.h>
#else
# include <varargs.h>
#endif
#include <stdio.h>
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#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <netinet/in.h>
#ifdef HAVE_NETINET_IP_H
# include <netinet/ip.h>
#endif
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#else
# define PF_INET AF_INET
#endif
#ifdef HAVE_STDINT_H
# include <stdint.h> /* e.g. for Mac OS X */
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#endif
#ifdef TCPWRAP
# include <tcpd.h> /* for TCP Wrappers */
#endif
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#include "array.h"
#include "defines.h"
#include "resolve.h"
#include "exp.h"
#include "conn.h"
#include "imp.h"
#include "ngircd.h"
#include "client.h"
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#include "conf.h"
#include "conn-zip.h"
#include "conn-func.h"
#include "log.h"
#include "parse.h"
#include "tool.h"
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#ifdef ZEROCONF
# include "rendezvous.h"
#endif
#include "exp.h"
#define SERVER_WAIT (NONE - 1)
static bool Handle_Write PARAMS(( CONN_ID Idx ));
static bool Conn_Write PARAMS(( CONN_ID Idx, char *Data, size_t Len ));
static int New_Connection PARAMS(( int Sock ));
static CONN_ID Socket2Index PARAMS(( int Sock ));
static void Read_Request PARAMS(( CONN_ID Idx ));
static bool Handle_Buffer PARAMS(( CONN_ID Idx ));
static void Check_Connections PARAMS(( void ));
static void Check_Servers PARAMS(( void ));
static void Init_Conn_Struct PARAMS(( CONN_ID Idx ));
static bool Init_Socket PARAMS(( int Sock ));
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static void New_Server PARAMS(( int Server ));
static void Simple_Message PARAMS(( int Sock, const char *Msg ));
static int Count_Connections PARAMS(( struct sockaddr_in addr ));
static int NewListener PARAMS(( const UINT16 Port ));
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static array My_Listeners;
static array My_ConnArray;
#ifdef TCPWRAP
int allow_severity = LOG_INFO;
int deny_severity = LOG_ERR;
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#endif
static void server_login PARAMS((CONN_ID idx));
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static void cb_Read_Resolver_Result PARAMS(( int sock, UNUSED short what));
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static void cb_Connect_to_Server PARAMS(( int sock, UNUSED short what));
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static void cb_clientserver PARAMS((int sock, short what));
static void
cb_listen(int sock, short irrelevant)
{
(void) irrelevant;
New_Connection( sock );
}
static void
cb_connserver(int sock, UNUSED short what)
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{
int res, err;
socklen_t sock_len;
CONN_ID idx = Socket2Index( sock );
if (idx <= NONE) {
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LogDebug("cb_connserver wants to write on unknown socket?!");
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io_close(sock);
return;
}
assert( what & IO_WANTWRITE);
/* connect() finished, get result. */
sock_len = sizeof( err );
res = getsockopt( My_Connections[idx].sock, SOL_SOCKET, SO_ERROR, &err, &sock_len );
assert( sock_len == sizeof( err ));
/* Error while connecting? */
if ((res != 0) || (err != 0)) {
if (res != 0)
Log(LOG_CRIT, "getsockopt (connection %d): %s!",
idx, strerror(errno));
else
Log(LOG_CRIT,
"Can't connect socket to \"%s:%d\" (connection %d): %s!",
My_Connections[idx].host,
Conf_Server[Conf_GetServer(idx)].port,
idx, strerror(err));
Conn_Close(idx, "Can't connect!", NULL, false);
return;
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}
Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING );
server_login(idx);
}
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static void
server_login(CONN_ID idx)
{
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Log( LOG_INFO, "Connection %d with \"%s:%d\" established. Now logging in ...", idx,
My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
io_event_setcb( My_Connections[idx].sock, cb_clientserver);
io_event_add( My_Connections[idx].sock, IO_WANTREAD|IO_WANTWRITE);
/* Send PASS and SERVER command to peer */
Conn_WriteStr( idx, "PASS %s %s", Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID );
Conn_WriteStr( idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo );
}
static void
cb_clientserver(int sock, short what)
{
CONN_ID idx = Socket2Index( sock );
if (idx <= NONE) {
#ifdef DEBUG
Log(LOG_WARNING, "WTF: cb_clientserver wants to write on unknown socket?!");
#endif
io_close(sock);
return;
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}
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if (what & IO_WANTREAD)
Read_Request( idx );
if (what & IO_WANTWRITE)
Handle_Write( idx );
}
GLOBAL void
Conn_Init( void )
{
/* Modul initialisieren: statische Strukturen "ausnullen". */
CONN_ID i;
/* Speicher fuer Verbindungs-Pool anfordern */
Pool_Size = CONNECTION_POOL;
if( Conf_MaxConnections > 0 )
{
/* konfiguriertes Limit beachten */
if( Pool_Size > Conf_MaxConnections ) Pool_Size = Conf_MaxConnections;
}
if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)Pool_Size)) {
Log( LOG_EMERG, "Can't allocate memory! [Conn_Init]" );
exit( 1 );
}
/* FIXME: My_Connetions/Pool_Size is needed by other parts of the
* code; remove them! */
My_Connections = (CONNECTION*) array_start(&My_ConnArray);
LogDebug("Allocated connection pool for %d items (%ld bytes).",
array_length(&My_ConnArray, sizeof( CONNECTION )), array_bytes(&My_ConnArray));
assert( array_length(&My_ConnArray, sizeof( CONNECTION )) >= (size_t) Pool_Size);
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array_free( &My_Listeners );
/* Connection-Struktur initialisieren */
for( i = 0; i < Pool_Size; i++ ) Init_Conn_Struct( i );
/* Global write counter */
WCounter = 0;
} /* Conn_Init */
GLOBAL void
Conn_Exit( void )
{
/* Modul abmelden: alle noch offenen Connections
* schliessen und freigeben. */
CONN_ID idx;
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LogDebug("Shutting down all connections ..." );
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Conn_ExitListeners();
/* Sockets schliessen */
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for( idx = 0; idx < Pool_Size; idx++ ) {
if( My_Connections[idx].sock > NONE ) {
Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
"Server going down (restarting)":"Server going down", true );
}
}
array_free(&My_ConnArray);
My_Connections = NULL;
Pool_Size = 0;
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io_library_shutdown();
} /* Conn_Exit */
static unsigned int
ports_initlisteners(array *a, void (*func)(int,short))
{
unsigned int created = 0;
size_t len;
int fd;
UINT16 *port;
len = array_length(a, sizeof (UINT16));
port = array_start(a);
while(len--) {
fd = NewListener( *port );
if (fd < 0) {
port++;
continue;
}
if (!io_event_create( fd, IO_WANTREAD, func )) {
Log( LOG_ERR, "io_event_create(): Could not add listening fd %d (port %u): %s!",
fd, (unsigned int) *port, strerror(errno));
close(fd);
port++;
continue;
}
created++;
port++;
}
return created;
}
GLOBAL unsigned int
Conn_InitListeners( void )
{
/* Initialize ports on which the server should accept connections */
unsigned int created;
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if (!io_library_init(CONNECTION_POOL)) {
Log(LOG_EMERG, "Cannot initialize IO routines: %s", strerror(errno));
return -1;
}
created = ports_initlisteners(&Conf_ListenPorts, cb_listen);
return created;
} /* Conn_InitListeners */
GLOBAL void
Conn_ExitListeners( void )
{
/* Close down all listening sockets */
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int *fd;
size_t arraylen;
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#ifdef ZEROCONF
Rendezvous_UnregisterListeners( );
#endif
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arraylen = array_length(&My_Listeners, sizeof (int));
Log( LOG_INFO, "Shutting down all listening sockets (%d total)...", arraylen );
fd = array_start(&My_Listeners);
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while(arraylen--) {
assert(fd != NULL);
assert(*fd >= 0);
io_close(*fd);
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LogDebug("Listening socket %d closed.", *fd );
fd++;
}
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array_free(&My_Listeners);
} /* Conn_ExitListeners */
/* return new listening port file descriptor or -1 on failure */
static int
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NewListener( const UINT16 Port )
{
/* Create new listening socket on specified port */
struct sockaddr_in addr;
struct in_addr inaddr;
int sock;
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#ifdef ZEROCONF
char name[CLIENT_ID_LEN], *info;
#endif
/* Server-"Listen"-Socket initialisieren */
memset( &addr, 0, sizeof( addr ));
memset( &inaddr, 0, sizeof( inaddr ));
addr.sin_family = (sa_family_t)AF_INET;
addr.sin_port = htons( Port );
if( Conf_ListenAddress[0] )
{
#ifdef HAVE_INET_ATON
if( inet_aton( Conf_ListenAddress, &inaddr ) == 0 )
#else
inaddr.s_addr = inet_addr( Conf_ListenAddress );
if( inaddr.s_addr == (unsigned)-1 )
#endif
{
Log( LOG_CRIT, "Can't listen on %s:%u: can't convert ip address %s!",
Conf_ListenAddress, Port, Conf_ListenAddress );
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return -1;
}
}
else inaddr.s_addr = htonl( INADDR_ANY );
addr.sin_addr = inaddr;
sock = socket( PF_INET, SOCK_STREAM, 0);
if( sock < 0 ) {
Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
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return -1;
}
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if( ! Init_Socket( sock )) return -1;
if (bind(sock, (struct sockaddr *)&addr, (socklen_t)sizeof(addr)) != 0) {
Log( LOG_CRIT, "Can't bind socket (port %d) : %s!", Port, strerror( errno ));
close( sock );
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return -1;
}
if( listen( sock, 10 ) != 0 ) {
Log( LOG_CRIT, "Can't listen on socket: %s!", strerror( errno ));
close( sock );
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return -1;
}
/* keep fd in list so we can close it when ngircd restarts/shuts down */
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if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) {
Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno ));
close( sock );
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return -1;
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}
if( Conf_ListenAddress[0]) Log( LOG_INFO, "Now listening on %s:%d (socket %d).", Conf_ListenAddress, Port, sock );
else Log( LOG_INFO, "Now listening on 0.0.0.0:%d (socket %d).", Port, sock );
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#ifdef ZEROCONF
/* Get best server description text */
if( ! Conf_ServerInfo[0] ) info = Conf_ServerName;
else
{
/* Use server info string */
info = NULL;
if( Conf_ServerInfo[0] == '[' )
{
/* Cut off leading hostname part in "[]" */
info = strchr( Conf_ServerInfo, ']' );
if( info )
{
info++;
while( *info == ' ' ) info++;
}
}
if( ! info ) info = Conf_ServerInfo;
}
/* Add port number to description if non-standard */
if (Port != 6667)
snprintf(name, sizeof name, "%s (port %u)", info,
(unsigned int)Port);
else
strlcpy(name, info, sizeof name);
/* Register service */
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Rendezvous_Register( name, MDNS_TYPE, Port );
#endif
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return sock;
} /* NewListener */
GLOBAL void
Conn_Handler( void )
{
/* "Main Loop.": Loop until a signal (for shutdown or restart) arrives.
* Call io_dispatch() to check for read/writeable sockets every second
* Wait for status change on pending connections (e.g: when the hostname has been resolved)
* check for penalty/timeouts
* handle input buffers
*/
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int i;
unsigned int wdatalen;
struct timeval tv;
time_t t;
bool timeout;
while(( ! NGIRCd_SignalQuit ) && ( ! NGIRCd_SignalRestart )) {
timeout = true;
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#ifdef ZEROCONF
Rendezvous_Handler( );
#endif
/* Should the configuration be reloaded? */
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if (NGIRCd_SignalRehash) {
NGIRCd_Rehash( );
}
/* Check configured servers and established links */
Check_Servers( );
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Check_Connections( );
t = time( NULL );
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/* noch volle Lese-Buffer suchen */
for( i = 0; i < Pool_Size; i++ ) {
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if(( My_Connections[i].sock > NONE ) && ( array_bytes(&My_Connections[i].rbuf) > 0 ) &&
( My_Connections[i].delaytime < t ))
{
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/* Kann aus dem Buffer noch ein Befehl extrahiert werden? */
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if (Handle_Buffer( i )) timeout = false;
}
}
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/* noch volle Schreib-Puffer suchen */
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for( i = 0; i < Pool_Size; i++ ) {
if ( My_Connections[i].sock <= NONE )
continue;
wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
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#ifdef ZLIB
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if (( wdatalen > 0 ) || ( array_bytes(&My_Connections[i].zip.wbuf)> 0 ))
#else
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if ( wdatalen > 0 )
#endif
{
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/* Socket der Verbindung in Set aufnehmen */
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io_event_add( My_Connections[i].sock, IO_WANTWRITE );
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}
}
/* von welchen Sockets koennte gelesen werden? */
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for (i = 0; i < Pool_Size; i++ ) {
if ( My_Connections[i].sock <= NONE )
continue;
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if (Resolve_INPROGRESS(&My_Connections[i].res_stat)) {
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/* wait for completion of Resolver Sub-Process */
io_event_del( My_Connections[i].sock, IO_WANTREAD );
continue;
}
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if ( Conn_OPTION_ISSET( &My_Connections[i], CONN_ISCONNECTING ))
continue; /* wait for completion of connect() */
if( My_Connections[i].delaytime > t ) {
/* Fuer die Verbindung ist eine "Penalty-Zeit" gesetzt */
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io_event_del( My_Connections[i].sock, IO_WANTREAD );
continue;
}
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io_event_add( My_Connections[i].sock, IO_WANTREAD );
}
/* (re-)set timeout - tv_sec/usec are undefined after io_dispatch() returns */
tv.tv_usec = 0;
tv.tv_sec = timeout ? 1 : 0;
/* wait for activity */
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i = io_dispatch( &tv );
if (i == -1 && errno != EINTR ) {
Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!", strerror(errno));
Log(LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME);
exit( 1 );
}
}
if( NGIRCd_SignalQuit ) Log( LOG_NOTICE|LOG_snotice, "Server going down NOW!" );
else if( NGIRCd_SignalRestart ) Log( LOG_NOTICE|LOG_snotice, "Server restarting NOW!" );
} /* Conn_Handler */
/**
* Write a text string into the socket of a connection.
* This function automatically appends CR+LF to the string and validates that
* the result is a valid IRC message (oversized messages are shortened, for
* example). Then it calls the Conn_Write() function to do the actual sending.
* @param Idx Index fo the connection.
* @param Format Format string, see printf().
* @return true on success, false otherwise.
*/
#ifdef PROTOTYPES
GLOBAL bool
Conn_WriteStr( CONN_ID Idx, char *Format, ... )
#else
GLOBAL bool
Conn_WriteStr( Idx, Format, va_alist )
CONN_ID Idx;
char *Format;
va_dcl
#endif
{
char buffer[COMMAND_LEN];
size_t len;
bool ok;
va_list ap;
assert( Idx > NONE );
assert( Format != NULL );
#ifdef PROTOTYPES
va_start( ap, Format );
#else
va_start( ap );
#endif
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if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
/*
* The string that should be written to the socket is longer
* than the allowed size of COMMAND_LEN bytes (including both
* the CR and LF characters). This can be caused by the
* IRC_WriteXXX() functions when the prefix of this server had
* to be added to an already "quite long" command line which
* has been received from a regular IRC client, for example.
*
* We are not allowed to send such "oversized" messages to
* other servers and clients, see RFC 2812 2.3 and 2813 3.3
* ("these messages SHALL NOT exceed 512 characters in length,
* counting all characters including the trailing CR-LF").
*
* So we have a big problem here: we should send more bytes
* to the network than we are allowed to and we don't know
* the originator (any more). The "old" behaviour of blaming
* the receiver ("next hop") is a bad idea (it could be just
* an other server only routing the message!), so the only
* option left is to shorten the string and to hope that the
* result is still somewhat useful ...
* -alex-
*/
strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
CUT_TXTSUFFIX);
}
#ifdef SNIFFER
if (NGIRCd_Sniffer)
Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
#endif
len = strlcat( buffer, "\r\n", sizeof( buffer ));
ok = Conn_Write(Idx, buffer, len);
My_Connections[Idx].msg_out++;
va_end( ap );
return ok;
} /* Conn_WriteStr */
/**
* Append Data to the outbound write buffer of a connection.
* @param Idx Index of the connection.
* @param Data pointer to the data.
* @param Len length of Data.
* @return true on success, false otherwise.
*/
static bool
Conn_Write( CONN_ID Idx, char *Data, size_t Len )
{
CLIENT *c;
size_t writebuf_limit = WRITEBUFFER_LEN;
assert( Idx > NONE );
assert( Data != NULL );
assert( Len > 0 );
c = Conn_GetClient(Idx);
assert( c != NULL);
/* Servers do get special write buffer limits, so they can generate
* all the messages that are required while peering. */
if (Client_Type(c) == CLIENT_SERVER)
writebuf_limit = WRITEBUFFER_SLINK_LEN;
/* Is the socket still open? A previous call to Conn_Write()
* may have closed the connection due to a fatal error.
* In this case it is sufficient to return an error, as well. */
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if( My_Connections[Idx].sock <= NONE ) {
LogDebug("Skipped write on closed socket (connection %d).", Idx);
return false;
}
#ifdef ZLIB
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if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
/* Compressed link:
* Zip_Buffer() does all the dirty work for us: it flushes
* the (pre-)compression buffers if required and handles
* all error conditions. */
if (!Zip_Buffer(Idx, Data, Len))
return false;
}
else
#endif
{
/* Uncompressed link:
* Check if outbound buffer has enough space for the data. */
if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
writebuf_limit) {
/* Buffer is full, flush it. Handle_Write deals with
* low-level errors, if any. */
if (!Handle_Write(Idx))
return false;
}
/* When the write buffer is still too big after flushing it,
* the connection will be killed. */
if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
writebuf_limit) {
Log(LOG_NOTICE,
"Write buffer overflow (connection %d, size %lu byte)!",
Idx,
(unsigned long)array_bytes(&My_Connections[Idx].wbuf));
Conn_Close(Idx, "Write buffer overflow!", NULL, false);
return false;
}
/* Copy data to write buffer */
if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
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return false;
My_Connections[Idx].bytes_out += Len;
}
/* Adjust global write counter */
WCounter += Len;
return true;
} /* Conn_Write */
GLOBAL void
Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient )
{
/* Close connection. Open pipes of asyncronous resolver
* sub-processes are closed down. */
CLIENT *c;
char *txt;
double in_k, out_k;
#ifdef ZLIB
double in_z_k, out_z_k;
int in_p, out_p;
#endif
assert( Idx > NONE );
/* Is this link already shutting down? */
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if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
/* Conn_Close() has been called recursively for this link;
* probabe reason: Handle_Write() failed -- see below. */
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LogDebug("Recursive request to close connection: %d", Idx );
return;
}
assert( My_Connections[Idx].sock > NONE );
/* Mark link as "closing" */
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Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
if (LogMsg)
txt = LogMsg;
else
txt = FwdMsg;
if (! txt)
txt = "Reason unknown";
Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host,
ntohs(My_Connections[Idx].addr.sin_port));
/* Search client, if any */
c = Conn_GetClient( Idx );
/* Should the client be informed? */
if (InformClient) {
#ifndef STRICT_RFC
/* Send statistics to client if registered as user: */
if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
Conn_WriteStr( Idx,
":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
Client_ID(Client_ThisServer()), Client_ID(c),
NOTICE_TXTPREFIX,
(double)My_Connections[Idx].bytes_in / 1024,
(double)My_Connections[Idx].bytes_out / 1024);
}
#endif
/* Send ERROR to client (see RFC!) */
if (FwdMsg)
Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
else
Conn_WriteStr(Idx, "ERROR :Closing connection.");
}
/* Try to write out the write buffer. Note: Handle_Write() eventually
* removes the CLIENT structure associated with this connection if an
* error occurs! So we have to re-check if there is still an valid
* CLIENT structure after calling Handle_Write() ...*/
(void)Handle_Write( Idx );
/* Search client, if any (re-check!) */
c = Conn_GetClient( Idx );
/* Shut down socket */
if (! io_close(My_Connections[Idx].sock)) {
/* Oops, we can't close the socket!? This is ... ugly! */
Log(LOG_CRIT,
"Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
ntohs(My_Connections[Idx].addr.sin_port), strerror(errno));
}
/* Mark socket as invalid: */
My_Connections[Idx].sock = NONE;
/* If there is still a client, unregister it now */
if (c)
Client_Destroy(c, LogMsg, FwdMsg, true);
/* Calculate statistics and log information */
in_k = (double)My_Connections[Idx].bytes_in / 1024;
out_k = (double)My_Connections[Idx].bytes_out / 1024;
#ifdef ZLIB
if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
/* Make sure that no division by zero can occur during
* the calculation of in_p and out_p: in_z_k and out_z_k
* are non-zero, that's guaranteed by the protocol until
* compression can be enabled. */
if (! in_z_k)
in_z_k = in_k;
if (! out_z_k)
out_z_k = out_k;
in_p = (int)(( in_k * 100 ) / in_z_k );
out_p = (int)(( out_k * 100 ) / out_z_k );
Log(LOG_INFO,
"Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
Idx, My_Connections[Idx].host,
ntohs(My_Connections[Idx].addr.sin_port),
in_k, in_z_k, in_p, out_k, out_z_k, out_p);
}
else
#endif
{
Log(LOG_INFO,
"Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
Idx, My_Connections[Idx].host,
ntohs(My_Connections[Idx].addr.sin_port),
in_k, out_k);
}
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/* cancel running resolver */
if (Resolve_INPROGRESS(&My_Connections[Idx].res_stat))
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Resolve_Shutdown(&My_Connections[Idx].res_stat);
/* Servers: Modify time of next connect attempt? */
Conf_UnsetServer( Idx );
#ifdef ZLIB
/* Clean up zlib, if link was compressed */
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if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
inflateEnd( &My_Connections[Idx].zip.in );
deflateEnd( &My_Connections[Idx].zip.out );
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array_free(&My_Connections[Idx].zip.rbuf);
array_free(&My_Connections[Idx].zip.wbuf);
}
#endif
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array_free(&My_Connections[Idx].rbuf);
array_free(&My_Connections[Idx].wbuf);
/* Clean up connection structure (=free it) */
Init_Conn_Struct( Idx );
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LogDebug("Shutdown of connection %d completed.", Idx );
} /* Conn_Close */
GLOBAL void
Conn_SyncServerStruct( void )
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{
/* Synchronize server structures (connection IDs):
* connections <-> configuration */
CLIENT *client;
CONN_ID i;
int c;
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2006-02-02 22:00:21 +01:00
for( i = 0; i < Pool_Size; i++ ) {
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/* Established connection? */
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if (My_Connections[i].sock < 0)
continue;
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/* Server connection? */
client = Conn_GetClient( i );
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if(( ! client ) || ( Client_Type( client ) != CLIENT_SERVER )) continue;
for( c = 0; c < MAX_SERVERS; c++ )
{
/* Configured server? */
if( ! Conf_Server[c].host[0] ) continue;
/* Duplicate? */
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if( strcmp( Conf_Server[c].name, Client_ID( client )) == 0 )
Conf_Server[c].conn_id = i;
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}
}
} /* SyncServerStruct */
/**
* Send out data of write buffer; connect new sockets.
*/
static bool
Handle_Write( CONN_ID Idx )
{
ssize_t len;
size_t wdatalen;
assert( Idx > NONE );
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if ( My_Connections[Idx].sock < 0 ) {
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LogDebug("Handle_Write() on closed socket, connection %d", Idx);
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return false;
}
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assert( My_Connections[Idx].sock > NONE );
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wdatalen = array_bytes(&My_Connections[Idx].wbuf );
#ifdef ZLIB
if (wdatalen == 0) {
/* Write buffer is empty, so we try to flush the compression
* buffer and get some data to work with from there :-) */
if (!Zip_Flush(Idx))
return false;
/* Now the write buffer most probably has changed: */
wdatalen = array_bytes(&My_Connections[Idx].wbuf);
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}
#endif
if (wdatalen == 0) {
/* Still no data, fine. */
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io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
return true;
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}
LogDebug
("Handle_Write() called for connection %d, %ld bytes pending ...",
Idx, wdatalen);
len = write(My_Connections[Idx].sock,
array_start(&My_Connections[Idx].wbuf), wdatalen );
if( len < 0 ) {
if (errno == EAGAIN || errno == EINTR)
return true;
Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
Idx, My_Connections[Idx].sock, strerror(errno));
Conn_Close(Idx, "Write error!", NULL, false);
return false;
}
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/* move any data not yet written to beginning */
array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
return true;
} /* Handle_Write */
static int
New_Connection( int Sock )
{
/* Neue Client-Verbindung von Listen-Socket annehmen und
* CLIENT-Struktur anlegen. */
#ifdef TCPWRAP
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struct request_info req;
#endif
struct sockaddr_in new_addr;
int new_sock, new_sock_len, new_Pool_Size;
CLIENT *c;
long cnt;
assert( Sock > NONE );
/* Connection auf Listen-Socket annehmen */
new_sock_len = (int)sizeof new_addr;
new_sock = accept(Sock, (struct sockaddr *)&new_addr,
(socklen_t *)&new_sock_len);
if (new_sock < 0) {
Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
return -1;
}
#ifdef TCPWRAP
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/* Validate socket using TCP Wrappers */
request_init( &req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock, RQ_CLIENT_SIN, &new_addr, NULL );
fromhost(&req);
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if( ! hosts_access( &req ))
{
/* Access denied! */
Log( deny_severity, "Refused connection from %s (by TCP Wrappers)!", inet_ntoa( new_addr.sin_addr ));
Simple_Message( new_sock, "ERROR :Connection refused" );
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close( new_sock );
return -1;
2003-03-07 15:35:52 +01:00
}
#endif
/* Socket initialisieren */
if (!Init_Socket( new_sock ))
return -1;
/* Check IP-based connection limit */
cnt = Count_Connections( new_addr );
if(( Conf_MaxConnectionsIP > 0 ) && ( cnt >= Conf_MaxConnectionsIP ))
{
/* Access denied, too many connections from this IP address! */
Log( LOG_ERR, "Refused connection from %s: too may connections (%ld) from this IP address!", inet_ntoa( new_addr.sin_addr ), cnt);
Simple_Message( new_sock, "ERROR :Connection refused, too many connections from your IP address!" );
close( new_sock );
return -1;
}
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if( new_sock >= Pool_Size ) {
new_Pool_Size = new_sock + 1;
/* No free Connection Structures, check if we may accept further connections */
if ((( Conf_MaxConnections > 0) && Pool_Size >= Conf_MaxConnections) ||
(new_Pool_Size < Pool_Size))
{
Log( LOG_ALERT, "Can't accept connection: limit (%d) reached!", Pool_Size );
Simple_Message( new_sock, "ERROR :Connection limit reached" );
close( new_sock );
return -1;
}
if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
(size_t)new_sock)) {
Log( LOG_EMERG, "Can't allocate memory! [New_Connection]" );
Simple_Message( new_sock, "ERROR: Internal error" );
close( new_sock );
return -1;
}
LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
new_sock, array_length(&My_ConnArray, sizeof(CONNECTION)), array_bytes(&My_ConnArray));
/* Adjust pointer to new block */
My_Connections = array_start(&My_ConnArray);
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while (Pool_Size < new_Pool_Size)
Init_Conn_Struct(Pool_Size++);
}
/* register callback */
if (!io_event_create( new_sock, IO_WANTREAD, cb_clientserver)) {
Log(LOG_ALERT, "Can't accept connection: io_event_create failed!");
Simple_Message(new_sock, "ERROR :Internal error");
close(new_sock);
return -1;
}
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c = Client_NewLocal( new_sock, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWN, false );
if( ! c ) {
Log(LOG_ALERT, "Can't accept connection: can't create client structure!");
Simple_Message(new_sock, "ERROR :Internal error");
io_close(new_sock);
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return -1;
}
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Init_Conn_Struct( new_sock );
My_Connections[new_sock].sock = new_sock;
My_Connections[new_sock].addr = new_addr;
My_Connections[new_sock].client = c;
Log( LOG_INFO, "Accepted connection %d from %s:%d on socket %d.", new_sock,
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inet_ntoa( new_addr.sin_addr ), ntohs( new_addr.sin_port), Sock );
/* Hostnamen ermitteln */
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strlcpy( My_Connections[new_sock].host, inet_ntoa( new_addr.sin_addr ),
sizeof( My_Connections[new_sock].host ));
Client_SetHostname( c, My_Connections[new_sock].host );
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2006-02-08 16:20:21 +01:00
Resolve_Addr(&My_Connections[new_sock].res_stat, &new_addr,
My_Connections[new_sock].sock, cb_Read_Resolver_Result);
/* Penalty-Zeit setzen */
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Conn_SetPenalty( new_sock, 4 );
return new_sock;
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} /* New_Connection */
static CONN_ID
Socket2Index( int Sock )
{
/* zum Socket passende Connection suchen */
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assert( Sock >= 0 );
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if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
/* die Connection wurde vermutlich (wegen eines
* Fehlers) bereits wieder abgebaut ... */
LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
return NONE;
}
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return Sock;
} /* Socket2Index */
/**
* Read data from the network to the read buffer. If an error occures,
* the socket of this connection will be shut down.
*/
static void
Read_Request( CONN_ID Idx )
{
ssize_t len;
char readbuf[READBUFFER_LEN];
CLIENT *c;
assert( Idx > NONE );
assert( My_Connections[Idx].sock > NONE );
#ifdef ZLIB
if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
(array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
#else
if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
#endif
{
/* Read buffer is full */
Log(LOG_ERR,
"Receive buffer overflow (connection %d): %d bytes!",
Idx, array_bytes(&My_Connections[Idx].rbuf));
Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
return;
}
len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
if (len == 0) {
Log(LOG_INFO, "%s:%d (%s) is closing the connection ...",
My_Connections[Idx].host,
ntohs(My_Connections[Idx].addr.sin_port),
inet_ntoa( My_Connections[Idx].addr.sin_addr));
Conn_Close(Idx,
"Socket closed!", "Client closed connection",
false);
return;
}
if (len < 0) {
if( errno == EAGAIN ) return;
Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
Idx, My_Connections[Idx].sock, strerror(errno));
Conn_Close(Idx, "Read error!", "Client closed connection",
false);
return;
}
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#ifdef ZLIB
if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
(size_t) len)) {
Log(LOG_ERR,
"Could not append recieved data to zip input buffer (connn %d): %d bytes!",
Idx, len);
Conn_Close(Idx, "Receive buffer overflow!", NULL,
false);
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return;
}
} else
#endif
{
2007-05-02 14:34:30 +02:00
if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
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Log( LOG_ERR, "Could not append recieved data to input buffer (connn %d): %d bytes!", Idx, len );
Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
}
}
/* Update connection statistics */
My_Connections[Idx].bytes_in += len;
/* Update timestamp of last data received if this connection is
* registered as a user, server or service connection. Don't update
* otherwise, so users have at least Conf_PongTimeout seconds time to
* register with the IRC server -- see Check_Connections().
* Set "lastping", too, so we can handle time shifts backwards ... */
c = Conn_GetClient(Idx);
if (c && (Client_Type(c) == CLIENT_USER
|| Client_Type(c) == CLIENT_SERVER
|| Client_Type(c) == CLIENT_SERVICE)) {
My_Connections[Idx].lastdata = time(NULL);
My_Connections[Idx].lastping = My_Connections[Idx].lastdata;
}
/* Look at the data in the (read-) buffer of this connection */
Handle_Buffer(Idx);
} /* Read_Request */
static bool
Handle_Buffer( CONN_ID Idx )
{
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/* Handle Data in Connections Read-Buffer.
* Return true if a reuqest was handled, false otherwise (also returned on errors). */
#ifndef STRICT_RFC
char *ptr1, *ptr2;
#endif
char *ptr;
size_t len, delta;
2005-08-28 18:51:20 +02:00
bool result;
time_t starttime;
#ifdef ZLIB
bool old_z;
#endif
starttime = time(NULL);
result = false;
2005-08-28 18:51:20 +02:00
for (;;) {
/* Check penalty */
if( My_Connections[Idx].delaytime > starttime) return result;
#ifdef ZLIB
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/* unpack compressed data */
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if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP ))
if( ! Unzip_Buffer( Idx )) return false;
#endif
2005-07-28 18:13:09 +02:00
if (0 == array_bytes(&My_Connections[Idx].rbuf))
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break;
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if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) /* make sure buf is NULL terminated */
2005-07-07 20:49:04 +02:00
return false;
/* A Complete Request end with CR+LF, see RFC 2812. */
ptr = strstr( array_start(&My_Connections[Idx].rbuf), "\r\n" );
if( ptr ) delta = 2; /* complete request */
#ifndef STRICT_RFC
2005-07-07 20:49:04 +02:00
else {
/* Check for non-RFC-compliant request (only CR or LF)? Unfortunately,
* there are quite a few clients that do this (incl. "mIRC" :-( */
ptr1 = strchr( array_start(&My_Connections[Idx].rbuf), '\r' );
ptr2 = strchr( array_start(&My_Connections[Idx].rbuf), '\n' );
delta = 1;
if( ptr1 && ptr2 ) ptr = ptr1 > ptr2 ? ptr2 : ptr1;
else if( ptr1 ) ptr = ptr1;
else if( ptr2 ) ptr = ptr2;
}
#endif
2005-07-07 20:49:04 +02:00
if( ! ptr )
break;
/* End of request found */
*ptr = '\0';
len = ( ptr - (char*) array_start(&My_Connections[Idx].rbuf)) + delta;
if( len > ( COMMAND_LEN - 1 )) {
2005-07-07 20:49:04 +02:00
/* Request must not exceed 512 chars (incl. CR+LF!), see
* RFC 2812. Disconnect Client if this happens. */
Log( LOG_ERR, "Request too long (connection %d): %d bytes (max. %d expected)!",
Idx, array_bytes(&My_Connections[Idx].rbuf), COMMAND_LEN - 1 );
Conn_Close( Idx, NULL, "Request too long", true );
return false;
}
if (len <= 2) { /* request was empty (only '\r\n') */
array_moveleft(&My_Connections[Idx].rbuf, 1, delta); /* delta is either 1 or 2 */
2005-08-28 01:42:23 +02:00
break;
}
#ifdef ZLIB
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/* remember if stream is already compressed */
old_z = My_Connections[Idx].options & CONN_ZIP;
#endif
2005-08-28 18:51:20 +02:00
My_Connections[Idx].msg_in++;
if (!Parse_Request(Idx, (char*)array_start(&My_Connections[Idx].rbuf) ))
return false;
result = true;
2005-08-28 18:51:20 +02:00
array_moveleft(&My_Connections[Idx].rbuf, 1, len);
LogDebug("Connection %d: %d bytes left in read buffer.",
Idx, array_bytes(&My_Connections[Idx].rbuf));
#ifdef ZLIB
2005-08-28 18:51:20 +02:00
if(( ! old_z ) && ( My_Connections[Idx].options & CONN_ZIP ) &&
( array_bytes(&My_Connections[Idx].rbuf) > 0 ))
2005-07-07 20:49:04 +02:00
{
/* The last Command activated Socket-Compression.
* Data that was read after that needs to be copied to Unzip-buf
* for decompression */
if (!array_copy( &My_Connections[Idx].zip.rbuf, &My_Connections[Idx].rbuf ))
return false;
array_trunc(&My_Connections[Idx].rbuf);
2006-02-08 18:33:28 +01:00
LogDebug("Moved already received data (%u bytes) to uncompression buffer.",
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array_bytes(&My_Connections[Idx].zip.rbuf));
}
2005-07-07 20:49:04 +02:00
#endif /* ZLIB */
2005-08-28 18:51:20 +02:00
}
return result;
} /* Handle_Buffer */
static void
Check_Connections(void)
2001-12-26 04:20:53 +01:00
{
2005-07-09 23:35:20 +02:00
/* check if connections are alive. if not, play PING-PONG first.
* if this doesn't help either, disconnect client. */
CLIENT *c;
CONN_ID i;
2001-12-26 04:20:53 +01:00
for (i = 0; i < Pool_Size; i++) {
if (My_Connections[i].sock < 0)
continue;
c = Conn_GetClient(i);
if (c && ((Client_Type(c) == CLIENT_USER)
|| (Client_Type(c) == CLIENT_SERVER)
|| (Client_Type(c) == CLIENT_SERVICE))) {
2005-07-09 23:35:20 +02:00
/* connected User, Server or Service */
if (My_Connections[i].lastping >
My_Connections[i].lastdata) {
/* We already sent a ping */
if (My_Connections[i].lastping <
time(NULL) - Conf_PongTimeout) {
2001-12-26 04:20:53 +01:00
/* Timeout */
LogDebug
("Connection %d: Ping timeout: %d seconds.",
i, Conf_PongTimeout);
Conn_Close(i, NULL, "Ping timeout",
true);
2001-12-26 04:20:53 +01:00
}
} else if (My_Connections[i].lastdata <
time(NULL) - Conf_PingTimeout) {
/* We need to send a PING ... */
LogDebug("Connection %d: sending PING ...", i);
My_Connections[i].lastping = time(NULL);
Conn_WriteStr(i, "PING :%s",
Client_ID(Client_ThisServer()));
2001-12-26 04:20:53 +01:00
}
} else {
/* The connection is not fully established yet, so
* we don't do the PING-PONG game here but instead
* disconnect the client after "a short time" if it's
* still not registered. */
if (My_Connections[i].lastdata <
time(NULL) - Conf_PongTimeout) {
LogDebug
("Unregistered connection %d timed out ...",
i);
Conn_Close(i, NULL, "Timeout", false);
}
}
}
} /* Check_Connections */
static void
Check_Servers( void )
{
/* Check if we can establish further server links */
int i, n;
time_t time_now;
/* Check all configured servers */
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for( i = 0; i < MAX_SERVERS; i++ ) {
/* Valid outgoing server which isn't already connected or disabled? */
2005-08-31 00:08:00 +02:00
if(( ! Conf_Server[i].host[0] ) || ( ! Conf_Server[i].port > 0 ) ||
( Conf_Server[i].conn_id > NONE ) || ( Conf_Server[i].flags & CONF_SFLAG_DISABLED ))
continue;
/* Is there already a connection in this group? */
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if( Conf_Server[i].group > NONE ) {
2005-09-02 19:01:23 +02:00
for (n = 0; n < MAX_SERVERS; n++) {
if (n == i) continue;
if ((Conf_Server[n].conn_id > NONE) &&
(Conf_Server[n].group == Conf_Server[i].group))
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break;
}
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if (n < MAX_SERVERS) continue;
}
/* Check last connect attempt? */
time_now = time(NULL);
if( Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
continue;
/* Okay, try to connect now */
Conf_Server[i].lasttry = time_now;
2006-02-08 16:20:21 +01:00
assert(Resolve_Getfd(&Conf_Server[i].res_stat) < 0);
Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host, cb_Connect_to_Server);
}
} /* Check_Servers */
static void
2006-02-08 16:20:21 +01:00
New_Server( int Server )
{
/* Establish new server link */
struct sockaddr_in new_addr;
struct in_addr inaddr;
int res, new_sock;
CLIENT *c;
assert( Server > NONE );
2005-08-31 00:08:00 +02:00
Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ", Conf_Server[Server].host,
Conf_Server[Server].ip, Conf_Server[Server].port );
#ifdef HAVE_INET_ATON
if( inet_aton( Conf_Server[Server].ip, &inaddr ) == 0 )
#else
memset( &inaddr, 0, sizeof( inaddr ));
inaddr.s_addr = inet_addr( Conf_Server[Server].ip );
if( inaddr.s_addr == (unsigned)-1 )
#endif
{
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Log( LOG_ERR, "Can't connect to \"%s\": can't convert ip address %s!",
Conf_Server[Server].host, Conf_Server[Server].ip );
return;
}
memset( &new_addr, 0, sizeof( new_addr ));
new_addr.sin_family = (sa_family_t)AF_INET;
new_addr.sin_addr = inaddr;
new_addr.sin_port = htons( Conf_Server[Server].port );
new_sock = socket( PF_INET, SOCK_STREAM, 0 );
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if ( new_sock < 0 ) {
Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
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return;
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}
if( ! Init_Socket( new_sock )) return;
res = connect(new_sock, (struct sockaddr *)&new_addr,
(socklen_t)sizeof(new_addr));
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if(( res != 0 ) && ( errno != EINPROGRESS )) {
Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
close( new_sock );
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return;
}
if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
Log(LOG_ALERT,
"Cannot allocate memory for server connection (socket %d)",
new_sock);
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close( new_sock );
return;
}
My_Connections = array_start(&My_ConnArray);
assert(My_Connections[new_sock].sock <= 0);
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Init_Conn_Struct(new_sock);
c = Client_NewLocal( new_sock, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWNSERVER, false );
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if( ! c ) {
Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
close( new_sock );
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return;
}
Client_SetIntroducer( c, c );
Client_SetToken( c, TOKEN_OUTBOUND );
/* Register connection */
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Conf_Server[Server].conn_id = new_sock;
My_Connections[new_sock].sock = new_sock;
My_Connections[new_sock].addr = new_addr;
My_Connections[new_sock].client = c;
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strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
sizeof(My_Connections[new_sock].host ));
/* Register new socket */
if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
Log( LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
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Conn_Close( new_sock, "io_event_create() failed", NULL, false );
Init_Conn_Struct( new_sock );
Conf_Server[Server].conn_id = NONE;
}
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LogDebug("Registered new connection %d on socket %d.",
new_sock, My_Connections[new_sock].sock );
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Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
} /* New_Server */
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static void
Init_Conn_Struct( CONN_ID Idx )
{
time_t now = time( NULL );
/* Connection-Struktur initialisieren */
memset( &My_Connections[Idx], 0, sizeof ( CONNECTION ));
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My_Connections[Idx].sock = -1;
My_Connections[Idx].lastdata = now;
My_Connections[Idx].lastprivmsg = now;
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Resolve_Init(&My_Connections[Idx].res_stat);
} /* Init_Conn_Struct */
static bool
Init_Socket( int Sock )
{
/* Initialize socket (set options) */
int value;
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if (!io_setnonblock(Sock)) {
Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
close( Sock );
return false;
}
/* Don't block this port after socket shutdown */
value = 1;
if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
{
Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
/* ignore this error */
}
/* Set type of service (TOS) */
#if defined(IP_TOS) && defined(IPTOS_LOWDELAY)
value = IPTOS_LOWDELAY;
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LogDebug("Setting option IP_TOS on socket %d to IPTOS_LOWDELAY (%d).", Sock, value );
if( setsockopt( Sock, SOL_IP, IP_TOS, &value, (socklen_t)sizeof( value )) != 0 )
{
Log( LOG_ERR, "Can't set socket option IP_TOS: %s!", strerror( errno ));
/* ignore this error */
}
#endif
return true;
} /* Init_Socket */
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static void
cb_Connect_to_Server(int fd, UNUSED short events)
{
/* Read result of resolver sub-process from pipe and start connection */
int i;
size_t len;
char readbuf[HOST_LEN + 1];
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LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
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for (i=0; i < MAX_SERVERS; i++) {
if (Resolve_Getfd(&Conf_Server[i].res_stat) == fd )
break;
}
if( i >= MAX_SERVERS) {
/* Ops, no matching server found?! */
io_close( fd );
LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
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return;
}
/* Read result from pipe */
len = Resolve_Read(&Conf_Server[i].res_stat, readbuf, sizeof readbuf -1);
if (len == 0)
return;
readbuf[len] = '\0';
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LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
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strlcpy( Conf_Server[i].ip, readbuf, sizeof( Conf_Server[i].ip ));
/* connect() */
New_Server(i);
} /* cb_Read_Forward_Lookup */
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static void
cb_Read_Resolver_Result( int r_fd, UNUSED short events )
{
/* Read result of resolver sub-process from pipe and update the
* apropriate connection/client structure(s): hostname and/or
* IDENT user name.*/
CLIENT *c;
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int i;
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size_t len;
char *identptr;
#ifdef IDENTAUTH
char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
#else
char readbuf[HOST_LEN + 1];
#endif
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LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
/* Search associated connection ... */
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for( i = 0; i < Pool_Size; i++ ) {
if(( My_Connections[i].sock != NONE )
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&& ( Resolve_Getfd(&My_Connections[i].res_stat) == r_fd ))
break;
}
if( i >= Pool_Size ) {
/* Ops, none found? Probably the connection has already
* been closed!? We'll ignore that ... */
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io_close( r_fd );
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LogDebug("Resolver: Got callback for unknown connection!?");
return;
}
/* Read result from pipe */
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len = Resolve_Read(&My_Connections[i].res_stat, readbuf, sizeof readbuf -1);
if (len == 0)
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return;
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readbuf[len] = '\0';
identptr = strchr(readbuf, '\n');
assert(identptr != NULL);
if (!identptr) {
Log( LOG_CRIT, "Resolver: Got malformed result!");
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return;
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}
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*identptr = '\0';
LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
/* Okay, we got a complete result: this is a host name for outgoing
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* connections and a host name and IDENT user name (if enabled) for
* incoming connections.*/
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assert ( My_Connections[i].sock >= 0 );
/* Incoming connection. Search client ... */
c = Conn_GetClient( i );
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assert( c != NULL );
/* Only update client information of unregistered clients */
if( Client_Type( c ) == CLIENT_UNKNOWN ) {
strlcpy(My_Connections[i].host, readbuf, sizeof( My_Connections[i].host));
Client_SetHostname( c, readbuf);
#ifdef IDENTAUTH
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++identptr;
if (*identptr) {
Log( LOG_INFO, "IDENT lookup for connection %ld: \"%s\".", i, identptr);
Client_SetUser( c, identptr, true );
} else {
Log( LOG_INFO, "IDENT lookup for connection %ld: no result.", i );
}
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#endif
}
#ifdef DEBUG
else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
#endif
/* Reset penalty time */
Conn_ResetPenalty( i );
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} /* cb_Read_Resolver_Result */
static void
Simple_Message( int Sock, const char *Msg )
{
char buf[COMMAND_LEN];
size_t len;
/* Write "simple" message to socket, without using compression
* or even the connection write buffers. Used e.g. for error
* messages by New_Connection(). */
assert( Sock > NONE );
assert( Msg != NULL );
strlcpy( buf, Msg, sizeof buf - 2);
len = strlcat( buf, "\r\n", sizeof buf);
(void)write(Sock, buf, len);
} /* Simple_Error */
static int
Count_Connections( struct sockaddr_in addr_in )
{
int i, cnt;
cnt = 0;
for( i = 0; i < Pool_Size; i++ ) {
if(( My_Connections[i].sock > NONE ) && ( My_Connections[i].addr.sin_addr.s_addr == addr_in.sin_addr.s_addr )) cnt++;
}
return cnt;
} /* Count_Connections */
GLOBAL CLIENT *
Conn_GetClient( CONN_ID Idx )
{
/* return Client-Structure that belongs to the local Connection Idx.
* If none is found, return NULL.
*/
CONNECTION *c;
assert( Idx >= 0 );
c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
assert(c != NULL);
return c ? c->client : NULL;
}
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/* -eof- */