ngircd-tor/src/ngircd/ngircd.c

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/*
* ngIRCd -- The Next Generation IRC Daemon
* Copyright (c)2001-2011 Alexander Barton (alex@barton.de) and Contributors.
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*
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* 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.
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*/
#include "portab.h"
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/**
* @file
* The main program, including the C function main() which is called
* by the loader of the operating system.
*/
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#include "imp.h"
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#include <assert.h>
#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pwd.h>
#include <grp.h>
#if defined(DEBUG) && defined(HAVE_MTRACE)
#include <mcheck.h>
#endif
#include "defines.h"
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#include "conn.h"
#include "conf-ssl.h"
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#include "channel.h"
#include "conf.h"
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#include "lists.h"
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#include "log.h"
#include "parse.h"
#include "sighandlers.h"
#include "io.h"
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#include "irc.h"
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#include "exp.h"
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#include "ngircd.h"
static void Show_Version PARAMS(( void ));
static void Show_Help PARAMS(( void ));
static void Pidfile_Create PARAMS(( pid_t pid ));
static void Pidfile_Delete PARAMS(( void ));
static void Fill_Version PARAMS(( void ));
static void Setup_FDStreams PARAMS(( int fd ));
static bool NGIRCd_Init PARAMS(( bool ));
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/**
* The main() function of ngIRCd.
*
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* 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.
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*/
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GLOBAL int
main( int argc, const char *argv[] )
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{
bool ok, configtest = false;
bool NGIRCd_NoDaemon = false;
int i;
size_t n;
#if defined(DEBUG) && defined(HAVE_MTRACE)
/* enable GNU libc memory tracing when running in debug mode
* and functionality available */
mtrace();
#endif
umask( 0077 );
NGIRCd_SignalQuit = NGIRCd_SignalRestart = 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 ));
Fill_Version( );
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/* parse conmmand line */
for( i = 1; i < argc; i++ )
{
ok = false;
if(( argv[i][0] == '-' ) && ( argv[i][1] == '-' ))
{
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/* long 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] != '-' ))
{
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/* short 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] == 'h') {
Show_Version();
puts(""); Show_Help(); puts("");
exit(1);
}
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 (argv[i][n] == 'V') {
Show_Version();
exit(1);
}
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 );
}
}
/* Debug level for "VERSION" command */
NGIRCd_DebugLevel[0] = '\0';
#ifdef DEBUG
if( NGIRCd_Debug ) strcpy( NGIRCd_DebugLevel, "1" );
#endif
#ifdef SNIFFER
if( NGIRCd_Sniffer )
{
NGIRCd_Debug = true;
strcpy( NGIRCd_DebugLevel, "2" );
}
#endif
if( configtest )
{
Show_Version( ); puts( "" );
exit( Conf_Test( ));
}
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while( ! NGIRCd_SignalQuit )
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{
/* 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_SignalRestart = false;
NGIRCd_SignalQuit = false;
/* Initialize modules, part I */
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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( );
Conn_Init( );
if (!io_library_init(CONNECTION_POOL)) {
Log(LOG_ALERT, "Fatal: Cannot initialize IO routines: %s", strerror(errno));
exit(1);
}
if (!Signals_Init()) {
Log(LOG_ALERT, "Fatal: Could not set up signal handlers: %s", strerror(errno));
exit(1);
}
srandom(getpid());
/* Create protocol and server identification. The syntax
* used by ngIRCd in PASS commands and the known "extended
* flags" are described in doc/Protocol.txt. */
#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
LogDebug("Protocol and server ID is \"%s\".", NGIRCd_ProtoID);
Channel_InitPredefined( );
if( Conn_InitListeners( ) < 1 )
{
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 );
}
/* Main Run Loop */
Conn_Handler( );
Conn_Exit( );
Client_Exit( );
Channel_Exit( );
Log_Exit( );
}
Pidfile_Delete( );
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return 0;
} /* main */
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/**
* Generate ngIRCd "version strings".
*
* The ngIRCd version information is generated once and then stored in the
* NGIRCd_Version and NGIRCd_VersionAddition string variables for further
* usage, for example by the IRC command "VERSION" and the --version command
* line switch.
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*/
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 SSL_SUPPORT
if ( NGIRCd_VersionAddition[0] ) strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
strlcat( NGIRCd_VersionAddition, "SSL", sizeof NGIRCd_VersionAddition );
#endif
#ifdef TCPWRAP
if( NGIRCd_VersionAddition[0] )
strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
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#endif
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#ifdef IDENTAUTH
if( NGIRCd_VersionAddition[0] )
strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
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#endif
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#ifdef PAM
if (NGIRCd_VersionAddition[0])
strlcat(NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition);
strlcat(NGIRCd_VersionAddition, "PAM", 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
#ifdef WANT_IPV6
if (NGIRCd_VersionAddition[0])
strlcat(NGIRCd_VersionAddition, "+", sizeof(NGIRCd_VersionAddition));
strlcat(NGIRCd_VersionAddition, "IPv6", 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 ));
snprintf(NGIRCd_Version, sizeof NGIRCd_Version, "%s %s-%s",
PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_VersionAddition);
} /* Fill_Version */
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/**
* Display copyright and version information of ngIRCd on the console.
*/
static void
Show_Version( void )
{
puts( NGIRCd_Version );
puts( "Copyright (c)2001-2011 Alexander Barton (<alex@barton.de>) and Contributors." );
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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 */
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/**
* 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 <f> use file <f> as configuration file" );
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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( " -V, --version output version information and exit" );
puts( " -h, --help display this help and exit" );
} /* Show_Help */
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/**
* 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 */
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/**
* Create the file containing the process ID of ngIRCd ("PID file").
*
* @param pid The process ID to be stored in this file.
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*/
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 */
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/**
* Redirect stdin, stdout and stderr to apropriate file handles.
*
* @param fd The file handle stdin, stdout and stderr should be redirected to.
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*/
static void
Setup_FDStreams(int fd)
{
if (fd < 0)
return;
fflush(stdout);
fflush(stderr);
/* Create new stdin(0), stdout(1) and stderr(2) descriptors */
dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
} /* Setup_FDStreams */
/**
* Get user and group ID of unprivileged "nobody" user.
*
* @param uid User ID
* @param gid Group ID
* @return true on success.
*/
static bool
NGIRCd_getNobodyID(uid_t *uid, gid_t *gid )
{
struct passwd *pwd;
#ifdef __CYGWIN__
/* Cygwin kludge.
* It can return EINVAL instead of EPERM
* so, if we are already unprivileged,
* use id of current user.
*/
if (geteuid() && getuid()) {
*uid = getuid();
*gid = getgid();
return true;
}
#endif
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;
} /* NGIRCd_getNobodyID */
/**
* Initialize ngIRCd daemon.
*
* @param NGIRCd_NoDaemon Set to true if ngIRCd should run in the
* foreground and not as a daemon.
* @return true on success.
*/
static bool
NGIRCd_Init( bool NGIRCd_NoDaemon )
{
static bool initialized;
bool chrooted = false;
struct passwd *pwd;
struct group *grp;
int real_errno, fd = -1;
pid_t pid;
if (initialized)
return true;
if (!NGIRCd_NoDaemon) {
/* open /dev/null before chroot() */
fd = open( "/dev/null", O_RDWR);
if (fd < 0)
Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
}
if (!ConnSSL_InitLibrary())
Log(LOG_WARNING,
"Warning: Error during SSL initialization, continuing ...");
if( Conf_Chroot[0] ) {
if( chdir( Conf_Chroot ) != 0 ) {
Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
goto out;
}
if( chroot( Conf_Chroot ) != 0 ) {
if (errno != EPERM) {
Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
Conf_Chroot, strerror( errno ));
goto out;
}
} 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" );
goto out;
}
}
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)
goto out;
}
}
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)
goto out;
}
}
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 */
#ifndef NeXT
(void)setsid( );
#else
setpgrp(0, getpid());
#endif
if (chdir( "/" ) != 0)
Log(LOG_ERR, "Can't change directory to '/': %s",
strerror(errno));
/* Detach stdin, stdout and stderr */
Setup_FDStreams(fd);
if (fd > 2) {
close(fd);
fd = -1;
}
}
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", (long)Conf_UID,
grp ? grp->gr_name : "unknown", (long)Conf_GID, (long)pid);
if (chrooted) {
Log(LOG_INFO, "Running with root directory \"%s\".",
Conf_Chroot );
return true;
} else
Log(LOG_INFO, "Not running with changed root directory.");
/* 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;
out:
if (fd > 2)
close(fd);
return false;
} /* NGIRCd_Init */
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/* -eof- */