X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?p=ngircd-alex.git;a=blobdiff_plain;f=src%2Fngircd%2Fngircd.c;h=d2a6d7ea8faae860f0df893edef82969acf80a3b;hp=263c3a542e597d69126623d6cae196ac29a3b5dd;hb=47ca178a219d682c589b27e64ee1a4e936cc7bdc;hpb=ec30cd4e5feb7890ff9e1a0317a6cf06d16a3629

diff --git a/src/ngircd/ngircd.c b/src/ngircd/ngircd.c
index 263c3a54..d2a6d7ea 100644
--- a/src/ngircd/ngircd.c
+++ b/src/ngircd/ngircd.c
@@ -1,20 +1,24 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2005 by Alexander Barton (alex@barton.de)
+ * 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.
- *
- * Main program -- main()
  */
 
 
 #include "portab.h"
 
-static char UNUSED id[] = "$Id: ngircd.c,v 1.94 2005/02/11 13:52:37 alex Exp $";
+static char UNUSED id[] = "$Id: ngircd.c,v 1.117 2007/11/21 12:16:36 alex Exp $";
+
+/**
+ * @file
+ * The main program, including the C function main() which is called
+ * by the loader of the operating system.
+ */
 
 #include "imp.h"
 #include <assert.h>
@@ -44,7 +48,7 @@ static char UNUSED id[] = "$Id: ngircd.c,v 1.94 2005/02/11 13:52:37 alex Exp $";
 #include "parse.h"
 #include "irc.h"
 
-#ifdef RENDEZVOUS
+#ifdef ZEROCONF
 #include "rendezvous.h"
 #endif
 
@@ -52,38 +56,46 @@ static char UNUSED id[] = "$Id: ngircd.c,v 1.94 2005/02/11 13:52:37 alex Exp $";
 #include "ngircd.h"
 
 
-LOCAL VOID Initialize_Signal_Handler PARAMS(( VOID ));
-LOCAL VOID Signal_Handler PARAMS(( INT Signal ));
+static void Initialize_Signal_Handler PARAMS(( void ));
+static void Signal_Handler PARAMS(( int Signal ));
 
-LOCAL VOID Show_Version PARAMS(( VOID ));
-LOCAL VOID Show_Help PARAMS(( VOID ));
+static void Show_Version PARAMS(( void ));
+static void Show_Help PARAMS(( void ));
 
-LOCAL VOID Pidfile_Create PARAMS(( LONG ));
-LOCAL VOID Pidfile_Delete PARAMS(( VOID ));
+static void Pidfile_Create PARAMS(( pid_t pid ));
+static void Pidfile_Delete PARAMS(( void ));
 
-LOCAL VOID Fill_Version PARAMS(( VOID ));
+static void Fill_Version PARAMS(( void ));
 
-LOCAL VOID Setup_FDStreams PARAMS(( VOID ));
+static void Setup_FDStreams PARAMS(( void ));
 
+static bool NGIRCd_Init PARAMS(( bool ));
 
+/**
+ * The main() function of ngIRCd.
+ * Here all starts: this function is called by the operating system loader,
+ * it is the first portion of code executed of ngIRCd.
+ * @param argc The number of arguments passed to ngIRCd on the command line.
+ * @param argv An array containing all the arguments passed to ngIRCd.
+ * @return Global exit code of ngIRCd, zero on success.
+ */
 GLOBAL int
 main( int argc, const char *argv[] )
 {
-	struct passwd *pwd;
-	struct group *grp;
-	BOOLEAN ok, configtest = FALSE;
-	LONG pid, n;
-	INT i;
+	bool ok, configtest = false;
+	bool NGIRCd_NoDaemon = false;
+	int i;
+	size_t n;
 
 	umask( 0077 );
 
-	NGIRCd_SignalQuit = NGIRCd_SignalRestart = NGIRCd_SignalRehash = FALSE;
-	NGIRCd_NoDaemon = NGIRCd_Passive = FALSE;
+	NGIRCd_SignalQuit = NGIRCd_SignalRestart = NGIRCd_SignalRehash = false;
+	NGIRCd_Passive = false;
 #ifdef DEBUG
-	NGIRCd_Debug = FALSE;
+	NGIRCd_Debug = false;
 #endif
 #ifdef SNIFFER
-	NGIRCd_Sniffer = FALSE;
+	NGIRCd_Sniffer = false;
 #endif
 	strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile ));
 	strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile ));
@@ -93,7 +105,7 @@ main( int argc, const char *argv[] )
 	/* Kommandozeile parsen */
 	for( i = 1; i < argc; i++ )
 	{
-		ok = FALSE;
+		ok = false;
 		if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
 		{
 			/* Lange Option */
@@ -106,19 +118,19 @@ main( int argc, const char *argv[] )
 					strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 
 					/* next parameter */
-					i++; ok = TRUE;
+					i++; ok = true;
 				}
 			}
 			if( strcmp( argv[i], "--configtest" ) == 0 )
 			{
-				configtest = TRUE;
-				ok = TRUE;
+				configtest = true;
+				ok = true;
 			}
 #ifdef DEBUG
 			if( strcmp( argv[i], "--debug" ) == 0 )
 			{
-				NGIRCd_Debug = TRUE;
-				ok = TRUE;
+				NGIRCd_Debug = true;
+				ok = true;
 			}
 #endif
 			if( strcmp( argv[i], "--help" ) == 0 )
@@ -129,19 +141,19 @@ main( int argc, const char *argv[] )
 			}
 			if( strcmp( argv[i], "--nodaemon" ) == 0 )
 			{
-				NGIRCd_NoDaemon = TRUE;
-				ok = TRUE;
+				NGIRCd_NoDaemon = true;
+				ok = true;
 			}
 			if( strcmp( argv[i], "--passive" ) == 0 )
 			{
-				NGIRCd_Passive = TRUE;
-				ok = TRUE;
+				NGIRCd_Passive = true;
+				ok = true;
 			}
 #ifdef SNIFFER
 			if( strcmp( argv[i], "--sniffer" ) == 0 )
 			{
-				NGIRCd_Sniffer = TRUE;
-				ok = TRUE;
+				NGIRCd_Sniffer = true;
+				ok = true;
 			}
 #endif
 			if( strcmp( argv[i], "--version" ) == 0 )
@@ -153,15 +165,14 @@ main( int argc, const char *argv[] )
 		else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' ))
 		{
 			/* Kurze Option */
-			
-			for( n = 1; n < (LONG)strlen( argv[i] ); n++ )
+			for( n = 1; n < strlen( argv[i] ); n++ )
 			{
-				ok = FALSE;
+				ok = false;
 #ifdef DEBUG
 				if( argv[i][n] == 'd' )
 				{
-					NGIRCd_Debug = TRUE;
-					ok = TRUE;
+					NGIRCd_Debug = true;
+					ok = true;
 				}
 #endif
 				if( argv[i][n] == 'f' )
@@ -172,31 +183,32 @@ main( int argc, const char *argv[] )
 						strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile ));
 
 						/* go to the following parameter */
-						i++; n = (LONG)strlen( argv[i] );
-						ok = TRUE;
+						i++;
+						n = strlen( argv[i] );
+						ok = true;
 					}
 				}
 				if( argv[i][n] == 'n' )
 				{
-					NGIRCd_NoDaemon = TRUE;
-					ok = TRUE;
+					NGIRCd_NoDaemon = true;
+					ok = true;
 				}
 				if( argv[i][n] == 'p' )
 				{
-					NGIRCd_Passive = TRUE;
-					ok = TRUE;
+					NGIRCd_Passive = true;
+					ok = true;
 				}
 #ifdef SNIFFER
 				if( argv[i][n] == 's' )
 				{
-					NGIRCd_Sniffer = TRUE;
-					ok = TRUE;
+					NGIRCd_Sniffer = true;
+					ok = true;
 				}
 #endif
 				if( argv[i][n] == 't' )
 				{
-					configtest = TRUE;
-					ok = TRUE;
+					configtest = true;
+					ok = true;
 				}
 
 				if( ! ok )
@@ -224,7 +236,7 @@ main( int argc, const char *argv[] )
 #ifdef SNIFFER
 	if( NGIRCd_Sniffer )
 	{
-		NGIRCd_Debug = TRUE;
+		NGIRCd_Debug = true;
 		strcpy( NGIRCd_DebugLevel, "2" );
 	}
 #endif
@@ -240,93 +252,28 @@ main( int argc, const char *argv[] )
 	{
 		/* Initialize global variables */
 		NGIRCd_Start = time( NULL );
-		(VOID)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
+		(void)strftime( NGIRCd_StartStr, 64, "%a %b %d %Y at %H:%M:%S (%Z)", localtime( &NGIRCd_Start ));
 
-		NGIRCd_SignalRehash = FALSE;
-		NGIRCd_SignalRestart = FALSE;
-		NGIRCd_SignalQuit = FALSE;
+		NGIRCd_SignalRehash = false;
+		NGIRCd_SignalRestart = false;
+		NGIRCd_SignalQuit = false;
 
 		/* Initialize modules, part I */
-		Log_Init( );
+		Log_Init( ! NGIRCd_NoDaemon );
 		Conf_Init( );
 
-		if( Conf_Chroot[0] )
-		{
-			/* Chroot */
-			if( chdir( Conf_Chroot ) != 0 ) Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
-
-			if( chroot( Conf_Chroot ) != 0 ) Log( LOG_ERR, "Can't change root directory to \"%s\": %s", Conf_Chroot, strerror( errno ));
-			else Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
-		}
-
-		if( Conf_GID != 0 )
-		{
-			/* Set new group ID */
-			if( setgid( Conf_GID ) != 0 ) Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
-		}
-		if( Conf_UID != 0 )
-		{
-			/* Set new user ID */
-			if( setuid( Conf_UID ) != 0 ) Log( LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror( errno ));
-		}
-
-		/* Normally a child process is forked which isn't any longer
-		 * connected to ther controlling terminal. Use "--nodaemon"
-		 * to disable this "daemon mode" (useful for debugging). */
-		if( ! NGIRCd_NoDaemon )
-		{
-			/* fork child process */
-			pid = (LONG)fork( );
-			if( pid > 0 )
-			{
-				/* "Old" process: exit. */
-				exit( 0 );
-			}
-			if( pid < 0 )
-			{
-				/* Error!? */
-				fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n", PACKAGE_NAME, strerror( errno ));
-				exit( 1 );
-			}
-
-			/* New child process */
-			(VOID)setsid( );
-			chdir( "/" );
-
-			/* Detach stdin, stdout and stderr */
-			(VOID)Setup_FDStreams( );
-		}
-
-		/* Create PID file */
-		pid = (LONG) getpid( );
-		Pidfile_Create( pid );
-
-		/* Show user, group, and PID of the running daemon */
-		pwd = getpwuid( getuid( )); grp = getgrgid( getgid( ));
-		Log( LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.", pwd ? pwd->pw_name : "unknown", (LONG)getuid( ), grp ? grp->gr_name : "unknown", (LONG)getgid( ), pid);
-
-		/* Change working directory to home directory of the user
-		 * we are running as (when not running chroot()'ed!) */
-		if( Conf_UID != 0 && ! Conf_Chroot[0] )
-		{
-			struct passwd *pwd;
-
-			pwd = getpwuid( Conf_UID );
-			if( pwd != NULL )
-			{
-				if( chdir( pwd->pw_dir ) == 0 ) Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
-				else Log( LOG_ERR, "Can't change working directory to \"%s\": %s", pwd->pw_dir, strerror( errno ));
-			}
-			else Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
+		/* Initialize the "main program": chroot environment, user and
+		 * group ID, ... */
+		if (!NGIRCd_Init(NGIRCd_NoDaemon)) {
+			Log(LOG_ALERT, "Fatal: Initialization failed");
+			exit(1);
 		}
 
 		/* Initialize modules, part II: these functions are eventually
 		 * called with already dropped privileges ... */
-		Resolve_Init( );
-		Lists_Init( );
 		Channel_Init( );
 		Client_Init( );
-#ifdef RENDEZVOUS
+#ifdef ZEROCONF
 		Rendezvous_Init( );
 #endif
 		Conn_Init( );
@@ -344,17 +291,17 @@ main( int argc, const char *argv[] )
 		 * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
 		 * sind in doc/Protocol.txt beschrieben. */
 #ifdef IRCPLUS
-		sprintf( NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
+		snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
 #ifdef ZLIB
 		strcat( NGIRCd_ProtoID, "Z" );
 #endif
 		if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
 #else
-		sprintf( NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
+		snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
 #endif
-		strcat( NGIRCd_ProtoID, " P" );
+		strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
 #ifdef ZLIB
-		strcat( NGIRCd_ProtoID, "Z" );
+		strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
 #endif
 		Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
 
@@ -375,63 +322,85 @@ main( int argc, const char *argv[] )
 
 		/* Alles abmelden */
 		Conn_Exit( );
-#ifdef RENDEZVOUS
+#ifdef ZEROCONF
 		Rendezvous_Exit( );
 #endif
 		Client_Exit( );
 		Channel_Exit( );
-		Lists_Exit( );
 		Log_Exit( );
-
-		Pidfile_Delete( );
 	}
+	Pidfile_Delete( );
 
 	return 0;
 } /* main */
 
 
-LOCAL VOID
-Fill_Version( VOID )
+/**
+ * Generate ngIRCd "version string".
+ * This string is generated once and then stored in NGIRCd_Version for
+ * further usage, for example by the IRC command VERSION and the --version
+ * command line switch.
+ */
+static void
+Fill_Version( void )
 {
 	NGIRCd_VersionAddition[0] = '\0';
 
 #ifdef SYSLOG
-	strcpy( NGIRCd_VersionAddition, "SYSLOG" );
+	strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition );
 #endif
 #ifdef ZLIB
-	if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
-	strcat( NGIRCd_VersionAddition, "ZLIB" );
+	if( NGIRCd_VersionAddition[0] )
+		strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
+
+	strlcat( NGIRCd_VersionAddition, "ZLIB", sizeof NGIRCd_VersionAddition );
 #endif
 #ifdef TCPWRAP
-	if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
-	strcat( NGIRCd_VersionAddition, "TCPWRAP" );
+	if( NGIRCd_VersionAddition[0] )
+			strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
+
+	strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
 #endif
-#ifdef RENDEZVOUS
-	if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
-	strcat( NGIRCd_VersionAddition, "RENDEZVOUS" );
+#ifdef ZEROCONF
+	if( NGIRCd_VersionAddition[0] )
+		strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
+
+	strlcat( NGIRCd_VersionAddition, "ZEROCONF", sizeof NGIRCd_VersionAddition );
 #endif
 #ifdef IDENTAUTH
-	if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
-	strcat( NGIRCd_VersionAddition, "IDENT" );
+	if( NGIRCd_VersionAddition[0] )
+		strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
+
+	strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
 #endif
 #ifdef DEBUG
-	if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
-	strcat( NGIRCd_VersionAddition, "DEBUG" );
+	if( NGIRCd_VersionAddition[0] )
+		strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
+
+	strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
 #endif
 #ifdef SNIFFER
-	if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
-	strcat( NGIRCd_VersionAddition, "SNIFFER" );
+	if( NGIRCd_VersionAddition[0] )
+		strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
+
+	strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
 #endif
 #ifdef STRICT_RFC
-	if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
-	strcat( NGIRCd_VersionAddition, "RFC" );
+	if( NGIRCd_VersionAddition[0] )
+		strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
+
+	strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
 #endif
 #ifdef IRCPLUS
-	if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
-	strcat( NGIRCd_VersionAddition, "IRCPLUS" );
+	if( NGIRCd_VersionAddition[0] )
+		strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
+
+	strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
 #endif
 
-	if( NGIRCd_VersionAddition[0] ) strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
+	if( NGIRCd_VersionAddition[0] )
+		strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
+
 	strlcat( NGIRCd_VersionAddition, TARGET_CPU, sizeof( NGIRCd_VersionAddition ));
 	strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
 	strlcat( NGIRCd_VersionAddition, TARGET_VENDOR, sizeof( NGIRCd_VersionAddition ));
@@ -446,28 +415,37 @@ Fill_Version( VOID )
 } /* Fill_Version */
 
 
-GLOBAL VOID
-NGIRCd_Rehash( VOID )
+/**
+ * Reload the server configuration file.
+ */
+GLOBAL void
+NGIRCd_Rehash( void )
 {
-	CHAR old_name[CLIENT_ID_LEN];
+	char old_name[CLIENT_ID_LEN];
+	unsigned old_nicklen;
 
 	Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" );
-	NGIRCd_SignalRehash = FALSE;
+	NGIRCd_SignalRehash = false;
 
 	/* Close down all listening sockets */
 	Conn_ExitListeners( );
 
-	/* Remember old server name */
-	strcpy( old_name, Conf_ServerName );
+	/* Remember old server name and nick name length */
+	strlcpy( old_name, Conf_ServerName, sizeof old_name );
+	old_nicklen = Conf_MaxNickLength;
 
 	/* Re-read configuration ... */
 	Conf_Rehash( );
 
-	/* Recover old server name: it can't be changed during run-time */
-	if( strcmp( old_name, Conf_ServerName ) != 0 )
-	{
-		strcpy( Conf_ServerName, old_name );
-		Log( LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name." );
+	/* Recover old server name and nick name length: these values can't
+	 * be changed during run-time */
+	if (strcmp(old_name, Conf_ServerName) != 0 ) {
+		strlcpy(Conf_ServerName, old_name, sizeof Conf_ServerName);
+		Log(LOG_ERR, "Can't change \"ServerName\" on runtime! Ignored new name.");
+	}
+	if (old_nicklen != Conf_MaxNickLength) {
+		Conf_MaxNickLength = old_nicklen;
+		Log(LOG_ERR, "Can't change \"MaxNickLength\" on runtime! Ignored new value.");
 	}
 
 	/* Create new pre-defined channels */
@@ -483,8 +461,11 @@ NGIRCd_Rehash( VOID )
 } /* NGIRCd_Rehash */
 
 
-LOCAL VOID
-Initialize_Signal_Handler( VOID )
+/**
+ * Initialize the signal handler.
+ */
+static void
+Initialize_Signal_Handler( void )
 {
 	/* Signal-Handler initialisieren: einige Signale
 	 * werden ignoriert, andere speziell behandelt. */
@@ -505,49 +486,51 @@ Initialize_Signal_Handler( VOID )
 #endif
 
 	/* Signal-Handler einhaengen */
-	sigaction( SIGINT, &saction, NULL );
-	sigaction( SIGQUIT, &saction, NULL );
-	sigaction( SIGTERM, &saction, NULL);
-	sigaction( SIGHUP, &saction, NULL);
-	sigaction( SIGCHLD, &saction, NULL);
+	sigaction(SIGINT, &saction, NULL);
+	sigaction(SIGQUIT, &saction, NULL);
+	sigaction(SIGTERM, &saction, NULL);
+	sigaction(SIGHUP, &saction, NULL);
+	sigaction(SIGCHLD, &saction, NULL);
 
 	/* einige Signale ignorieren */
 	saction.sa_handler = SIG_IGN;
-	sigaction( SIGPIPE, &saction, NULL );
+	sigaction(SIGPIPE, &saction, NULL);
 #else
 	/* kein sigaction() vorhanden */
 
 	/* Signal-Handler einhaengen */
-	signal( SIGINT, Signal_Handler );
-	signal( SIGQUIT, Signal_Handler );
-	signal( SIGTERM, Signal_Handler );
-	signal( SIGHUP, Signal_Handler );
-	signal( SIGCHLD, Signal_Handler );
+	signal(SIGINT, Signal_Handler);
+	signal(SIGQUIT, Signal_Handler);
+	signal(SIGTERM, Signal_Handler);
+	signal(SIGHUP, Signal_Handler);
+	signal(SIGCHLD, Signal_Handler);
 
 	/* einige Signale ignorieren */
-	signal( SIGPIPE, SIG_IGN );
+	signal(SIGPIPE, SIG_IGN);
 #endif
 } /* Initialize_Signal_Handler */
 
 
-LOCAL VOID
-Signal_Handler( INT Signal )
+/**
+ * Signal handler of ngIRCd.
+ * This function is called whenever ngIRCd catches a signal sent by the
+ * user and/or the system to it. For example SIGTERM and SIGHUP.
+ * @param Signal Number of the signal to handle.
+ */
+static void
+Signal_Handler( int Signal )
 {
-	/* Signal-Handler. Dieser wird aufgerufen, wenn eines der Signale eintrifft,
-	 * fuer das wir uns registriert haben (vgl. Initialize_Signal_Handler). Die
-	 * Nummer des eingetroffenen Signals wird der Funktion uebergeben. */
-
 	switch( Signal )
 	{
 		case SIGTERM:
 		case SIGINT:
 		case SIGQUIT:
 			/* wir soll(t)en uns wohl beenden ... */
-			NGIRCd_SignalQuit = TRUE;
+			NGIRCd_SignalQuit = true;
 			break;
 		case SIGHUP:
 			/* Konfiguration neu einlesen: */
-			NGIRCd_SignalRehash = TRUE;
+			NGIRCd_SignalRehash = true;
 			break;
 		case SIGCHLD:
 			/* Child-Prozess wurde beendet. Zombies vermeiden: */
@@ -562,19 +545,27 @@ Signal_Handler( INT Signal )
 } /* Signal_Handler */
 
 
-LOCAL VOID
-Show_Version( VOID )
+/**
+ * Display copyright and version information of ngIRCd on the console.
+ */
+static void
+Show_Version( void )
 {
 	puts( NGIRCd_Version );
-	puts( "Copyright (c)2001-2005 by Alexander Barton (<alex@barton.de>)." );
-	puts( "Homepage: <http://arthur.ath.cx/~alex/ngircd/>\n" );
+	puts( "Copyright (c)2001-2007 Alexander Barton (<alex@barton.de>) and Contributors." );
+	puts( "Homepage: <http://ngircd.barton.de/>\n" );
 	puts( "This is free software; see the source for copying conditions. There is NO" );
 	puts( "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." );
 } /* Show_Version */
 
 
-LOCAL VOID
-Show_Help( VOID )
+/**
+ * Display a short help text on the console.
+ * This help depends on the configuration of the executable and only shows
+ * options that are actually enabled.
+ */
+static void
+Show_Help( void )
 {
 #ifdef DEBUG
 	puts( "  -d, --debug        log extra debug messages" );
@@ -591,8 +582,11 @@ Show_Help( VOID )
 } /* Show_Help */
 
 
-LOCAL VOID
-Pidfile_Delete( VOID )
+/**
+ * Delete the file containing the process ID (PID).
+ */
+static void
+Pidfile_Delete( void )
 {
 	/* Pidfile configured? */
 	if( ! Conf_PidFile[0] ) return;
@@ -606,10 +600,16 @@ Pidfile_Delete( VOID )
 } /* Pidfile_Delete */
 
 
-LOCAL VOID
-Pidfile_Create( LONG pid )
+/**
+ * Create the file containing the process ID of ngIRCd ("PID file").
+ * @param pid The process ID to be stored in this file.
+ */
+static void
+Pidfile_Create(pid_t pid)
 {
-	FILE *pidf;
+	int pidfd;
+	char pidbuf[64];
+	int len;
 
 	/* Pidfile configured? */
 	if( ! Conf_PidFile[0] ) return;
@@ -618,35 +618,45 @@ Pidfile_Create( LONG pid )
 	Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
 #endif
 
-	pidf = fopen( Conf_PidFile, "w" );
-
-	if( ! pidf )
-	{
+	pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
+	if ( pidfd < 0 ) {
 		Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 		return;
 	}
 
-	if( fprintf( pidf, "%ld\n", pid ) < 0 )
+	len = snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
+	if (len < 0 || len >= (int)sizeof pidbuf) {
+		Log( LOG_ERR, "Error converting pid");
+		return;
+	}
+	
+	if (write(pidfd, pidbuf, (size_t)len) != (ssize_t)len)
 		Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
 
-	if( fclose(pidf) != 0 )
+	if( close(pidfd) != 0 )
 		Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
 } /* Pidfile_Create */
 
 
-LOCAL VOID
-Setup_FDStreams( VOID )
+/**
+ * Redirect stdin, stdout and stderr to apropriate file handles.
+ */
+static void
+Setup_FDStreams( void )
 {
-	INT fd;
+	int fd;
 
 	/* Test if we can open /dev/null for reading and writing. If not
 	 * we are most probably chrooted already and the server has been
 	 * restarted. So we simply don't try to redirect stdXXX ... */
 	fd = open( "/dev/null", O_RDWR );
-	if ( fd < 0 ) return;
+	if ( fd < 0 ) {
+		Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));	
+		return;
+	} 
 
-	/* Close "old" stdin/out/err descriptors */
-	close( 0 ); close( 1 ); close( 2 );
+	fflush(stdout);
+	fflush(stderr);
 
 	/* Create new stdin(0), stdout(1) and stderr(2) descriptors */
 	dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
@@ -656,4 +666,151 @@ Setup_FDStreams( VOID )
 } /* Setup_FDStreams */
 
 
+static bool
+NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
+{
+	struct passwd *pwd;
+
+	pwd = getpwnam("nobody");
+	if (!pwd) return false;
+
+	if ( !pwd->pw_uid || !pwd->pw_gid)
+		return false;
+
+	*uid = pwd->pw_uid;	
+	*gid = pwd->pw_gid;
+	endpwent();
+
+	return true;	
+}
+
+
+static bool
+NGIRCd_Init( bool NGIRCd_NoDaemon ) 
+{
+	static bool initialized;
+	bool chrooted = false;
+	struct passwd *pwd;
+	struct group *grp;
+	int real_errno;
+	pid_t pid;
+
+	if (initialized)
+		return true;
+
+	if( Conf_Chroot[0] ) {
+		if( chdir( Conf_Chroot ) != 0 ) {
+			Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
+			return false;
+		}
+
+		if( chroot( Conf_Chroot ) != 0 ) {
+			if (errno != EPERM) {
+				Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
+								Conf_Chroot, strerror( errno ));
+
+				return false;
+			}
+		} else {
+			chrooted = true;
+			Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
+		}
+	}
+
+	if (Conf_UID == 0) {
+		Log(LOG_INFO, "ServerUID must not be 0, using \"nobody\" instead.", Conf_UID);
+
+  		if (! NGIRCd_getNobodyID(&Conf_UID, &Conf_GID)) {
+			Log(LOG_WARNING, "Could not get user/group ID of user \"nobody\": %s",
+					errno ? strerror(errno) : "not found" );
+			return false;
+		}
+	}
+
+	if (getgid() != Conf_GID) {
+		/* Change group ID */
+		if (setgid(Conf_GID) != 0) {
+			real_errno = errno;
+			Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
+			if (real_errno != EPERM) 
+				return false;
+		}
+	}
+
+	if (getuid() != Conf_UID) {
+		/* Change user ID */
+		if (setuid(Conf_UID) != 0) {
+			real_errno = errno;
+			Log(LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror(errno));
+			if (real_errno != EPERM) 
+				return false;
+		}
+	}
+
+	initialized = true;
+
+	/* Normally a child process is forked which isn't any longer
+	 * connected to ther controlling terminal. Use "--nodaemon"
+	 * to disable this "daemon mode" (useful for debugging). */
+	if ( ! NGIRCd_NoDaemon ) {
+		pid = fork( );
+		if( pid > 0 ) {
+			/* "Old" process: exit. */
+			exit( 0 );
+		}
+		if( pid < 0 ) {
+			/* Error!? */
+			fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
+								PACKAGE_NAME, strerror( errno ));
+			exit( 1 );
+		}
+
+		/* New child process */
+		(void)setsid( );
+		chdir( "/" );
+
+		/* Detach stdin, stdout and stderr */
+		Setup_FDStreams( );
+	}
+	pid = getpid();
+
+	Pidfile_Create( pid );
+
+	/* Check UID/GID we are running as, can be different from values
+	 * configured (e. g. if we were already started with a UID>0. */
+	Conf_UID = getuid();
+	Conf_GID = getgid();
+
+	pwd = getpwuid( Conf_UID );
+	grp = getgrgid( Conf_GID );
+
+	Log( LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
+				pwd ? pwd->pw_name : "unknown", Conf_UID,
+				grp ? grp->gr_name : "unknown", Conf_GID, pid);
+
+	if ( chrooted ) {
+		Log( LOG_INFO, "Running chrooted, chrootdir \"%s\".",  Conf_Chroot );
+		return true;
+	} else {
+		Log( LOG_INFO, "Not running chrooted." );
+	}
+
+	/* Change working directory to home directory of the user
+	 * we are running as (only when running in daemon mode and not in chroot) */
+	
+	if ( pwd ) {
+		if (!NGIRCd_NoDaemon ) {
+			if( chdir( pwd->pw_dir ) == 0 ) 
+				Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
+			else 
+				Log( LOG_INFO, "Notice: Can't change working directory to \"%s\": %s",
+								pwd->pw_dir, strerror( errno ));
+		}
+	} else {
+		Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
+	}
+
+return true;
+}
+
 /* -eof- */