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/*
Unix SMB/Netbios implementation.
Version 1.9.
Main SMB server routines
Copyright (C) Andrew Tridgell 1992-1998
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.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "trans2.h"
pstring servicesf = CONFIGFILE;
extern pstring debugf;
extern fstring global_myworkgroup;
extern fstring global_sam_name;
extern pstring global_myname;
int am_parent = 1;
/* the last message the was processed */
int last_message = -1;
/* a useful macro to debug the last message processed */
#define LAST_MESSAGE() smb_fn_name(last_message)
extern pstring scope;
extern int DEBUGLEVEL;
extern pstring user_socket_options;
#ifdef WITH_DFS
extern int dcelogin_atmost_once;
#endif /* WITH_DFS */
extern fstring remote_machine;
extern pstring OriginalDir;
extern pstring myhostname;
/****************************************************************************
when exiting, take the whole family
****************************************************************************/
static void *dflt_sig(void)
{
exit_server("caught signal");
return NULL;
}
/****************************************************************************
Send a SIGTERM to our process group.
*****************************************************************************/
static void killkids(void)
{
if(am_parent) kill(0,SIGTERM);
}
/****************************************************************************
open the socket communication
****************************************************************************/
static BOOL open_sockets_inetd(void)
{
extern int Client;
/* Started from inetd. fd 0 is the socket. */
/* We will abort gracefully when the client or remote system
goes away */
Client = dup(0);
/* close our standard file descriptors */
close_low_fds();
set_socket_options(Client,"SO_KEEPALIVE");
set_socket_options(Client,user_socket_options);
return True;
}
/****************************************************************************
open the socket communication
****************************************************************************/
static BOOL open_sockets(BOOL is_daemon,int port)
{
extern int Client;
int num_interfaces = iface_count();
int fd_listenset[FD_SETSIZE];
fd_set listen_set;
int s;
int i;
if (!is_daemon) {
return open_sockets_inetd();
}
#ifdef HAVE_ATEXIT
{
static int atexit_set;
if(atexit_set == 0) {
atexit_set=1;
atexit(killkids);
}
}
#endif
/* Stop zombies */
CatchChild();
FD_ZERO(&listen_set);
if(lp_interfaces() && lp_bind_interfaces_only()) {
/* We have been given an interfaces line, and been
told to only bind to those interfaces. Create a
socket per interface and bind to only these.
*/
if(num_interfaces > FD_SETSIZE) {
DEBUG(0,("open_sockets: Too many interfaces specified to bind to. Number was %d \
max can be %d\n",
num_interfaces, FD_SETSIZE));
return False;
}
/* Now open a listen socket for each of the
interfaces. */
for(i = 0; i < num_interfaces; i++) {
struct in_addr *ifip = iface_n_ip(i);
if(ifip == NULL) {
DEBUG(0,("open_sockets: interface %d has NULL IP address !\n", i));
continue;
}
s = fd_listenset[i] = open_socket_in(SOCK_STREAM, port, 0, ifip->s_addr);
if(s == -1)
return False;
/* ready to listen */
if (listen(s, 5) == -1) {
DEBUG(0,("listen: %s\n",strerror(errno)));
close(s);
return False;
}
FD_SET(s,&listen_set);
}
} else {
/* Just bind to 0.0.0.0 - accept connections
from anywhere. */
num_interfaces = 1;
/* open an incoming socket */
s = open_socket_in(SOCK_STREAM, port, 0,
interpret_addr(lp_socket_address()));
if (s == -1)
return(False);
/* ready to listen */
if (listen(s, 5) == -1) {
DEBUG(0,("open_sockets: listen: %s\n",
strerror(errno)));
close(s);
return False;
}
fd_listenset[0] = s;
FD_SET(s,&listen_set);
}
/* now accept incoming connections - forking a new process
for each incoming connection */
DEBUG(2,("waiting for a connection\n"));
while (1) {
fd_set lfds;
int num;
memcpy((char *)&lfds, (char *)&listen_set,
sizeof(listen_set));
num = sys_select(256,&lfds,NULL);
if (num == -1 && errno == EINTR)
continue;
/* Find the sockets that are read-ready -
accept on these. */
for( ; num > 0; num--) {
struct sockaddr addr;
int in_addrlen = sizeof(addr);
s = -1;
for(i = 0; i < num_interfaces; i++) {
if(FD_ISSET(fd_listenset[i],&lfds)) {
s = fd_listenset[i];
/* Clear this so we don't look
at it again. */
FD_CLR(fd_listenset[i],&lfds);
break;
}
}
Client = accept(s,&addr,&in_addrlen);
if (Client == -1 && errno == EINTR)
continue;
if (Client == -1) {
DEBUG(0,("open_sockets: accept: %s\n",
strerror(errno)));
continue;
}
if (Client != -1 && fork()==0) {
/* Child code ... */
/* close the listening socket(s) */
for(i = 0; i < num_interfaces; i++)
close(fd_listenset[i]);
/* close our standard file
descriptors */
close_low_fds();
am_parent = 0;
set_socket_options(Client,"SO_KEEPALIVE");
set_socket_options(Client,user_socket_options);
/* Reset global variables in util.c so
that client substitutions will be
done correctly in the process. */
reset_globals_after_fork();
/*
* Ensure this child has kernel oplock
* capabilities, but not it's children.
*/
set_process_capability(KERNEL_OPLOCK_CAPABILITY, True);
set_inherited_process_capability(KERNEL_OPLOCK_CAPABILITY, False);
return True;
}
/* The parent doesn't need this socket */
close(Client);
/* Force parent to check log size after
* spawning child. Fix from
* klausr@ITAP.Physik.Uni-Stuttgart.De. The
* parent smbd will log to logserver.smb. It
* writes only two messages for each child
* started/finished. But each child writes,
* say, 50 messages also in logserver.smb,
* begining with the debug_count of the
* parent, before the child opens its own log
* file logserver.client. In a worst case
* scenario the size of logserver.smb would be
* checked after about 50*50=2500 messages
* (ca. 100kb).
* */
force_check_log_size();
} /* end for num */
} /* end while 1 */
/* NOTREACHED return True; */
}
/****************************************************************************
reload the services file
**************************************************************************/
BOOL reload_services(BOOL test)
{
BOOL ret;
if (lp_loaded()) {
pstring fname;
pstrcpy(fname,lp_configfile());
if (file_exist(fname,NULL) && !strcsequal(fname,servicesf)) {
pstrcpy(servicesf,fname);
test = False;
}
}
reopen_logs();
if (test && !lp_file_list_changed())
return(True);
lp_killunused(conn_snum_used);
ret = lp_load(servicesf,False,False,True);
load_printers();
/* perhaps the config filename is now set */
if (!test)
reload_services(True);
reopen_logs();
load_interfaces();
{
extern int Client;
if (Client != -1) {
set_socket_options(Client,"SO_KEEPALIVE");
set_socket_options(Client,user_socket_options);
}
}
reset_mangled_cache();
/* this forces service parameters to be flushed */
become_service(NULL,True);
return(ret);
}
/****************************************************************************
this prevents zombie child processes
****************************************************************************/
BOOL reload_after_sighup = False;
static void sig_hup(int sig)
{
BlockSignals(True,SIGHUP);
DEBUG(0,("Got SIGHUP\n"));
/*
* Fix from <branko.cibej@hermes.si> here.
* We used to reload in the signal handler - this
* is a *BIG* no-no.
*/
reload_after_sighup = True;
BlockSignals(False,SIGHUP);
}
#if DUMP_CORE
/*******************************************************************
prepare to dump a core file - carefully!
********************************************************************/
static BOOL dump_core(void)
{
char *p;
pstring dname;
pstrcpy(dname,debugf);
if ((p=strrchr(dname,'/'))) *p=0;
pstrcat(dname,"/corefiles");
mkdir(dname,0700);
sys_chown(dname,getuid(),getgid());
chmod(dname,0700);
if (chdir(dname)) return(False);
umask(~(0700));
#ifdef HAVE_GETRLIMIT
#ifdef RLIMIT_CORE
{
struct rlimit rlp;
getrlimit(RLIMIT_CORE, &rlp);
rlp.rlim_cur = MAX(4*1024*1024,rlp.rlim_cur);
setrlimit(RLIMIT_CORE, &rlp);
getrlimit(RLIMIT_CORE, &rlp);
DEBUG(3,("Core limits now %d %d\n",
(int)rlp.rlim_cur,(int)rlp.rlim_max));
}
#endif
#endif
DEBUG(0,("Dumping core in %s\n",dname));
abort();
return(True);
}
#endif
/****************************************************************************
exit the server
****************************************************************************/
void exit_server(char *reason)
{
static int firsttime=1;
extern char *last_inbuf;
if (!firsttime) exit(0);
firsttime = 0;
unbecome_user();
DEBUG(2,("Closing connections\n"));
conn_close_all();
#ifdef WITH_DFS
if (dcelogin_atmost_once) {
dfs_unlogin();
}
#endif
if (!reason) {
int oldlevel = DEBUGLEVEL;
DEBUGLEVEL = 10;
DEBUG(0,("Last message was %s\n",smb_fn_name(last_message)));
if (last_inbuf)
show_msg(last_inbuf);
DEBUGLEVEL = oldlevel;
DEBUG(0,("===============================================================\n"));
#if DUMP_CORE
if (dump_core()) return;
#endif
}
locking_end();
DEBUG(3,("Server exit (%s)\n", (reason ? reason : "")));
#ifdef MEM_MAN
{
extern FILE *dbf;
smb_mem_write_verbose(dbf);
dbgflush();
}
#endif
exit(0);
}
/****************************************************************************
initialise connect, service and file structs
****************************************************************************/
static void init_structs(void)
{
get_myname(myhostname,NULL);
conn_init();
file_init();
init_rpc_pipe_hnd(); /* for RPC pipes */
init_lsa_policy_hnd(); /* for LSA handles */
init_dptrs();
}
/****************************************************************************
usage on the program
****************************************************************************/
static void usage(char *pname)
{
DEBUG(0,("Incorrect program usage - are you sure the command line is correct?\n"));
printf("Usage: %s [-D] [-p port] [-d debuglevel] ", pname);
printf("[-l log basename] [-s services file]\n" );
printf("Version %s\n",VERSION);
printf("\t-D become a daemon\n");
printf("\t-p port listen on the specified port\n");
printf("\t-d debuglevel set the debuglevel\n");
printf("\t-l log basename. Basename for log/debug files\n");
printf("\t-s services file. Filename of services file\n");
printf("\t-P passive only\n");
printf("\t-a append to log file (default)\n");
printf("\t-o overwrite log file, don't append\n");
printf("\t-i scope NetBIOS scope to use (default none)\n");
printf("\n");
}
/****************************************************************************
main program
****************************************************************************/
int main(int argc,char *argv[])
{
extern BOOL append_log;
/* shall I run as a daemon */
BOOL is_daemon = False;
int port = SMB_PORT;
int opt;
extern char *optarg;
#ifdef HAVE_SET_AUTH_PARAMETERS
set_auth_parameters(argc,argv);
#endif
#ifdef HAVE_SETLUID
/* needed for SecureWare on SCO */
setluid(0);
#endif
append_log = True;
TimeInit();
pstrcpy(debugf,SMBLOGFILE);
pstrcpy(remote_machine, "smb");
setup_logging(argv[0],False);
charset_initialise();
/* make absolutely sure we run as root - to handle cases where people
are crazy enough to have it setuid */
#ifdef HAVE_SETRESUID
setresuid(0,0,0);
#else
setuid(0);
seteuid(0);
setuid(0);
seteuid(0);
#endif
fault_setup((void (*)(void *))exit_server);
CatchSignal(SIGTERM , SIGNAL_CAST dflt_sig);
/* we are never interested in SIGPIPE */
BlockSignals(True,SIGPIPE);
/* we want total control over the permissions on created files,
so set our umask to 0 */
umask(0);
dos_GetWd(OriginalDir);
init_uid();
/* this is for people who can't start the program correctly */
while (argc > 1 && (*argv[1] != '-')) {
argv++;
argc--;
}
while ( EOF != (opt = getopt(argc, argv, "O:i:l:s:d:Dp:h?Paof:")) )
switch (opt) {
case 'O':
pstrcpy(user_socket_options,optarg);
break;
case 'i':
pstrcpy(scope,optarg);
break;
case 'P':
{
extern BOOL passive;
passive = True;
}
break;
case 's':
pstrcpy(servicesf,optarg);
break;
case 'l':
pstrcpy(debugf,optarg);
break;
case 'a':
append_log = True;
break;
case 'o':
append_log = False;
break;
case 'D':
is_daemon = True;
break;
case 'd':
if (*optarg == 'A')
DEBUGLEVEL = 10000;
else
DEBUGLEVEL = atoi(optarg);
break;
case 'p':
port = atoi(optarg);
break;
case 'h':
case '?':
usage(argv[0]);
exit(0);
break;
default:
usage(argv[0]);
exit(1);
}
reopen_logs();
DEBUG(1,( "smbd version %s started.\n", VERSION));
DEBUGADD(1,( "Copyright Andrew Tridgell 1992-1998\n"));
DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
(int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
exit(1);
}
init_structs();
if (!reload_services(False))
return(-1);
/*
* Set the machine NETBIOS name if not already
* set from the config file.
*/
if (!*global_myname)
{
fstrcpy(global_myname, dns_to_netbios_name(myhostname));
}
strupper(global_myname);
#ifdef WITH_SSL
{
extern BOOL sslEnabled;
sslEnabled = lp_ssl_enabled();
if(sslEnabled)
sslutil_init(True);
}
#endif /* WITH_SSL */
codepage_initialise(lp_client_code_page());
if (!pwdb_initialise(True))
{
exit(1);
}
if(!initialise_sam_password_db())
{
exit(1);
}
if(!initialise_passgrp_db())
{
exit(1);
}
if(!initialise_group_db())
{
exit(1);
}
if(!initialise_alias_db())
{
exit(1);
}
if(!initialise_builtin_db())
{
exit(1);
}
if (!get_member_domain_sid())
{
DEBUG(0,("ERROR: Samba cannot obtain PDC SID from PDC(s) %s.\n",
lp_passwordserver()));
exit(1);
}
CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
/* Setup the signals that allow the debug log level
to by dynamically changed. */
/* If we are using the malloc debug code we can't use
SIGUSR1 and SIGUSR2 to do debug level changes. */
#ifndef MEM_MAN
#if defined(SIGUSR1)
CatchSignal( SIGUSR1, SIGNAL_CAST sig_usr1 );
#endif /* SIGUSR1 */
#if defined(SIGUSR2)
CatchSignal( SIGUSR2, SIGNAL_CAST sig_usr2 );
#endif /* SIGUSR2 */
#endif /* MEM_MAN */
DEBUG(3,( "loaded services\n"));
if (!is_daemon && !is_a_socket(0)) {
DEBUG(0,("standard input is not a socket, assuming -D option\n"));
is_daemon = True;
}
if (is_daemon) {
DEBUG( 3, ( "Becoming a daemon.\n" ) );
become_daemon();
}
check_kernel_oplocks();
if (!directory_exist(lp_lockdir(), NULL)) {
mkdir(lp_lockdir(), 0755);
}
if (is_daemon) {
pidfile_create("smbd");
}
if (!open_sockets(is_daemon,port))
exit(1);
if (!locking_init(0))
exit(1);
/* possibly reload the services file. */
reload_services(True);
if (*lp_rootdir()) {
if (sys_chroot(lp_rootdir()) == 0)
DEBUG(2,("Changed root to %s\n", lp_rootdir()));
}
/* Setup the oplock IPC socket. */
if( !open_oplock_ipc() )
exit(1);
smbd_process();
close_sockets();
exit_server("normal exit");
return(0);
}
|