X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?p=ngircd-alex.git;a=blobdiff_plain;f=src%2Fngircd%2Fngircd.c;h=dc5d58931610160c2798fe02378388dc16f2560a;hp=80beaabb78750b69bf12541d6bd0d262f787902f;hb=47ca178a219d682c589b27e64ee1a4e936cc7bdc;hpb=f4ade537d550b872b7e86e6ffce940dfbad4c60c diff --git a/src/ngircd/ngircd.c b/src/ngircd/ngircd.c index 80beaabb..d2a6d7ea 100644 --- a/src/ngircd/ngircd.c +++ b/src/ngircd/ngircd.c @@ -1,150 +1,816 @@ /* * ngIRCd -- The Next Generation IRC Daemon - * Copyright (c)2001 by Alexander Barton (alex@barton.de) - * - * Dieses Programm ist freie Software. Sie koennen es unter den Bedingungen - * der GNU General Public License (GPL), wie von der Free Software Foundation - * herausgegeben, weitergeben und/oder modifizieren, entweder unter Version 2 - * der Lizenz oder (wenn Sie es wuenschen) jeder spaeteren Version. - * Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste - * der an comBase beteiligten Autoren finden Sie in der Datei AUTHORS. - * - * $Id: ngircd.c,v 1.1 2001/12/11 21:53:04 alex Exp $ - * - * ngircd.c: Hier beginnt alles ;-) - * - * $Log: ngircd.c,v $ - * Revision 1.1 2001/12/11 21:53:04 alex - * Initial revision + * 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. */ -#define PORTAB_CHECK_TYPES +#include "portab.h" -#ifndef socklen_t -#define socklen_t int -#endif +static char UNUSED id[] = "$Id: ngircd.c,v 1.117 2007/11/21 12:16:36 alex Exp $"; -#include -#include "global.h" +/** + * @file + * The main program, including the C function main() which is called + * by the loader of the operating system. + */ -#include +#include "imp.h" #include #include -#include -#include #include +#include +#include #include -#include -#include #include -#include - +#include +#include +#include +#include +#include +#include +#include + +#include "defines.h" +#include "resolve.h" +#include "conn.h" +#include "client.h" +#include "channel.h" +#include "conf.h" +#include "cvs-version.h" +#include "lists.h" #include "log.h" +#include "parse.h" +#include "irc.h" + +#ifdef ZEROCONF +#include "rendezvous.h" +#endif -#include +#include "exp.h" #include "ngircd.h" -BOOLEAN do_quit_now = FALSE; +static void Initialize_Signal_Handler PARAMS(( void )); +static void Signal_Handler PARAMS(( int Signal )); +static void Show_Version PARAMS(( void )); +static void Show_Help PARAMS(( void )); -LOCAL VOID Signal_Handler( INT Signal ); +static void Pidfile_Create PARAMS(( pid_t pid )); +static void Pidfile_Delete PARAMS(( void )); +static void Fill_Version PARAMS(( void )); -GLOBAL INT main( INT argc, CONST CHAR *argv[] ) +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[] ) { - FILE *fd; - struct sigaction saction; - struct sockaddr_in my_sock, a_sock; - int my_sock_hndl; - int a_sock_len, a_hndl; + bool ok, configtest = false; + bool NGIRCd_NoDaemon = false; + int i; + size_t n; - portab_check_types( ); + umask( 0077 ); - Log_Init( ); - - /* Signal-Handler initialisieren */ - memset( &saction, 0, sizeof( saction )); - saction.sa_handler = Signal_Handler; + NGIRCd_SignalQuit = NGIRCd_SignalRestart = NGIRCd_SignalRehash = false; + NGIRCd_Passive = false; +#ifdef DEBUG + NGIRCd_Debug = false; +#endif +#ifdef SNIFFER + NGIRCd_Sniffer = false; +#endif + strlcpy( NGIRCd_ConfFile, SYSCONFDIR, sizeof( NGIRCd_ConfFile )); + strlcat( NGIRCd_ConfFile, CONFIG_FILE, sizeof( NGIRCd_ConfFile )); - /* Signal-Handler einhaengen */ - sigaction( SIGHUP, &saction, NULL); - sigaction( SIGTERM, &saction, NULL); - sigaction( SIGUSR1, &saction, NULL); - sigaction( SIGUSR2, &saction, NULL); - - /* Server-"Listen"-Socket initialisieren */ - memset( &my_sock, 0, sizeof( my_sock )); - my_sock.sin_family = AF_INET; - my_sock.sin_port = htons( 6668 ); - my_sock.sin_addr.s_addr = htonl( INADDR_ANY ); - - /* Socket erzeugen, ... */ - my_sock_hndl = socket( AF_INET, SOCK_STREAM, 0); - if( socket < 0 ) + Fill_Version( ); + + /* Kommandozeile parsen */ + for( i = 1; i < argc; i++ ) { - Log( LOG_FATAL, "Can't create socket: %s", strerror( errno )); - exit( 1 ); + ok = false; + if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' )) + { + /* Lange Option */ + + if( strcmp( argv[i], "--config" ) == 0 ) + { + if( i + 1 < argc ) + { + /* Ok, there's an parameter left */ + strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile )); + + /* next parameter */ + i++; ok = true; + } + } + if( strcmp( argv[i], "--configtest" ) == 0 ) + { + configtest = true; + ok = true; + } +#ifdef DEBUG + if( strcmp( argv[i], "--debug" ) == 0 ) + { + NGIRCd_Debug = true; + ok = true; + } +#endif + if( strcmp( argv[i], "--help" ) == 0 ) + { + Show_Version( ); + puts( "" ); Show_Help( ); puts( "" ); + exit( 1 ); + } + if( strcmp( argv[i], "--nodaemon" ) == 0 ) + { + NGIRCd_NoDaemon = true; + ok = true; + } + if( strcmp( argv[i], "--passive" ) == 0 ) + { + NGIRCd_Passive = true; + ok = true; + } +#ifdef SNIFFER + if( strcmp( argv[i], "--sniffer" ) == 0 ) + { + NGIRCd_Sniffer = true; + ok = true; + } +#endif + if( strcmp( argv[i], "--version" ) == 0 ) + { + Show_Version( ); + exit( 1 ); + } + } + else if(( argv[i][0] == '-' ) && ( argv[i][1] != '-' )) + { + /* Kurze Option */ + for( n = 1; n < strlen( argv[i] ); n++ ) + { + ok = false; +#ifdef DEBUG + if( argv[i][n] == 'd' ) + { + NGIRCd_Debug = true; + ok = true; + } +#endif + if( argv[i][n] == 'f' ) + { + if(( ! argv[i][n + 1] ) && ( i + 1 < argc )) + { + /* Ok, next character is a blank */ + strlcpy( NGIRCd_ConfFile, argv[i + 1], sizeof( NGIRCd_ConfFile )); + + /* go to the following parameter */ + i++; + n = strlen( argv[i] ); + ok = true; + } + } + if( argv[i][n] == 'n' ) + { + NGIRCd_NoDaemon = true; + ok = true; + } + if( argv[i][n] == 'p' ) + { + NGIRCd_Passive = true; + ok = true; + } +#ifdef SNIFFER + if( argv[i][n] == 's' ) + { + NGIRCd_Sniffer = true; + ok = true; + } +#endif + if( argv[i][n] == 't' ) + { + configtest = true; + ok = true; + } + + if( ! ok ) + { + printf( "%s: invalid option \"-%c\"!\n", PACKAGE_NAME, argv[i][n] ); + printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME ); + exit( 1 ); + } + } + + } + if( ! ok ) + { + printf( "%s: invalid option \"%s\"!\n", PACKAGE_NAME, argv[i] ); + printf( "Try \"%s --help\" for more information.\n", PACKAGE_NAME ); + exit( 1 ); + } } - - /* ... an Port binden ... */ - if( bind( my_sock_hndl, (struct sockaddr *)&my_sock, (socklen_t)sizeof( my_sock )) < 0 ) + + /* Debug-Level (fuer IRC-Befehl "VERSION") ermitteln */ + NGIRCd_DebugLevel[0] = '\0'; +#ifdef DEBUG + if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" ); +#endif +#ifdef SNIFFER + if( NGIRCd_Sniffer ) { - Log( LOG_FATAL, "Can't bind socket: %s", strerror( errno )); - exit( 1 ); + NGIRCd_Debug = true; + strcpy( NGIRCd_DebugLevel, "2" ); } +#endif - /* ... und in "listen mode" gehen :-) */ - if( listen( my_sock_hndl, 4 ) < 0 ) + /* Soll nur die Konfigurations ueberprueft und ausgegeben werden? */ + if( configtest ) { - Log( LOG_FATAL, "Can't listen on soecket: %s", strerror( errno )); - exit( 1 ); + Show_Version( ); puts( "" ); + exit( Conf_Test( )); } - /* Hauptschleife */ - while( ! do_quit_now ) + while( ! NGIRCd_SignalQuit ) { - /* auf Verbindung warten */ - a_sock_len = sizeof( a_sock ); - memset( &a_sock, 0, a_sock_len ); - a_hndl = accept( my_sock_hndl, (struct sockaddr *)&a_sock, &a_sock_len ); - if( a_hndl < 0 ) + /* Initialize global variables */ + NGIRCd_Start = time( NULL ); + (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; + + /* Initialize modules, part I */ + Log_Init( ! NGIRCd_NoDaemon ); + Conf_Init( ); + + /* 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 ... */ + Channel_Init( ); + Client_Init( ); +#ifdef ZEROCONF + Rendezvous_Init( ); +#endif + Conn_Init( ); + +#ifdef DEBUG + /* Redirect stderr handle to "error file" for debugging + * when not running in "no daemon" mode: */ + if( ! NGIRCd_NoDaemon ) Log_InitErrorfile( ); +#endif + + /* Signal-Handler initialisieren */ + Initialize_Signal_Handler( ); + + /* Protokoll- und Server-Identifikation erzeugen. Die vom ngIRCd + * beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags + * sind in doc/Protocol.txt beschrieben. */ +#ifdef IRCPLUS + 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 + snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION ); +#endif + strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID ); +#ifdef ZLIB + strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID ); +#endif + Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID ); + + /* Vordefinierte Channels anlegen */ + Channel_InitPredefined( ); + + /* Listen-Ports initialisieren */ + if( Conn_InitListeners( ) < 1 ) { - if( errno == EINTR ) continue; - - Log( LOG_FATAL, "Can't accept connection: %s", strerror( errno )); + Log( LOG_ALERT, "Server isn't listening on a single port!" ); + Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME ); + Pidfile_Delete( ); exit( 1 ); } - Log( LOG_INFO, "Accepted connection from %s:%d (handle %d).", inet_ntoa( a_sock.sin_addr ), ntohs( a_sock.sin_port), a_hndl ); - fd = fdopen( a_hndl, "w" ); - - fputs( "hello world!\n", fd ); fflush( fd ); - fclose( fd ); - close( a_hndl ); - } - - /* Aufraeumen (Sockets etc.!?) */ + /* Hauptschleife */ + Conn_Handler( ); + + /* Alles abmelden */ + Conn_Exit( ); +#ifdef ZEROCONF + Rendezvous_Exit( ); +#endif + Client_Exit( ); + Channel_Exit( ); + Log_Exit( ); + } + Pidfile_Delete( ); - Log_Exit( ); return 0; } /* main */ -LOCAL VOID Signal_Handler( INT Signal ) +/** + * 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 + strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition ); +#endif +#ifdef 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] ) + strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition ); + + strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition ); +#endif +#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] ) + strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition ); + + strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition ); +#endif +#ifdef 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] ) + strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition ); + + strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition ); +#endif +#ifdef STRICT_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] ) + strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition ); + + strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition ); +#endif + + 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 )); + strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition )); + strlcat( NGIRCd_VersionAddition, TARGET_OS, sizeof( NGIRCd_VersionAddition )); + +#ifdef CVSDATE + snprintf( NGIRCd_Version, sizeof NGIRCd_Version,"%s %s(%s)-%s", PACKAGE_NAME, PACKAGE_VERSION, CVSDATE, NGIRCd_VersionAddition); +#else + snprintf( NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s", PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition); +#endif +} /* Fill_Version */ + + +/** + * Reload the server configuration file. + */ +GLOBAL void +NGIRCd_Rehash( void ) +{ + char old_name[CLIENT_ID_LEN]; + unsigned old_nicklen; + + Log( LOG_NOTICE|LOG_snotice, "Re-reading configuration NOW!" ); + NGIRCd_SignalRehash = false; + + /* Close down all listening sockets */ + Conn_ExitListeners( ); + + /* 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 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 */ + Channel_InitPredefined( ); + + /* Start listening on sockets */ + Conn_InitListeners( ); + + /* Sync configuration with established connections */ + Conn_SyncServerStruct( ); + + Log( LOG_NOTICE|LOG_snotice, "Re-reading of configuration done." ); +} /* NGIRCd_Rehash */ + + +/** + * Initialize the signal handler. + */ +static void +Initialize_Signal_Handler( void ) +{ + /* Signal-Handler initialisieren: einige Signale + * werden ignoriert, andere speziell behandelt. */ + +#ifdef HAVE_SIGACTION + /* sigaction() ist vorhanden */ + + struct sigaction saction; + + /* Signal-Struktur initialisieren */ + memset( &saction, 0, sizeof( saction )); + saction.sa_handler = Signal_Handler; +#ifdef SA_RESTART + saction.sa_flags |= SA_RESTART; +#endif +#ifdef SA_NOCLDWAIT + saction.sa_flags |= SA_NOCLDWAIT; +#endif + + /* Signal-Handler einhaengen */ + 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); +#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); + + /* einige Signale ignorieren */ + signal(SIGPIPE, SIG_IGN); +#endif +} /* Initialize_Signal_Handler */ + + +/** + * 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 ) { switch( Signal ) { case SIGTERM: - Log( LOG_WARN, "Got SIGTERM, terminating now ..." ); - do_quit_now = TRUE; + case SIGINT: + case SIGQUIT: + /* wir soll(t)en uns wohl beenden ... */ + NGIRCd_SignalQuit = true; + break; + case SIGHUP: + /* Konfiguration neu einlesen: */ + NGIRCd_SignalRehash = true; + break; + case SIGCHLD: + /* Child-Prozess wurde beendet. Zombies vermeiden: */ + while( waitpid( -1, NULL, WNOHANG ) > 0); break; +#ifdef DEBUG default: - Log( LOG_WARN, "Got signal %d! I'll ignore it.", Signal ); + /* unbekanntes bzw. unbehandeltes Signal */ + Log( LOG_DEBUG, "Got signal %d! Ignored.", Signal ); +#endif } } /* Signal_Handler */ +/** + * Display copyright and version information of ngIRCd on the console. + */ +static void +Show_Version( void ) +{ + puts( NGIRCd_Version ); + puts( "Copyright (c)2001-2007 Alexander Barton () and Contributors." ); + puts( "Homepage: \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 */ + + +/** + * 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" ); +#endif + puts( " -f, --config use file as configuration file" ); + puts( " -n, --nodaemon don't fork and don't detach from controlling terminal" ); + puts( " -p, --passive disable automatic connections to other servers" ); +#ifdef SNIFFER + puts( " -s, --sniffer enable network sniffer and display all IRC traffic" ); +#endif + puts( " -t, --configtest read, validate and display configuration; then exit" ); + puts( " --version output version information and exit" ); + puts( " --help display this help and exit" ); +} /* Show_Help */ + + +/** + * Delete the file containing the process ID (PID). + */ +static void +Pidfile_Delete( void ) +{ + /* Pidfile configured? */ + if( ! Conf_PidFile[0] ) return; + +#ifdef DEBUG + Log( LOG_DEBUG, "Removing PID file (%s) ...", Conf_PidFile ); +#endif + + if( unlink( Conf_PidFile )) + Log( LOG_ERR, "Error unlinking PID file (%s): %s", Conf_PidFile, strerror( errno )); +} /* Pidfile_Delete */ + + +/** + * 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) +{ + int pidfd; + char pidbuf[64]; + int len; + + /* Pidfile configured? */ + if( ! Conf_PidFile[0] ) return; + +#ifdef DEBUG + Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile ); +#endif + + 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; + } + + 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( close(pidfd) != 0 ) + Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno )); +} /* Pidfile_Create */ + + +/** + * Redirect stdin, stdout and stderr to apropriate file handles. + */ +static void +Setup_FDStreams( void ) +{ + 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 ) { + Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno)); + return; + } + + fflush(stdout); + fflush(stderr); + + /* Create new stdin(0), stdout(1) and stderr(2) descriptors */ + dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 ); + + /* Close newly opened file descriptor if not stdin/out/err */ + if( fd > 2 ) close( fd ); +} /* 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- */