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authorJeremy Allison <jra@samba.org>2002-03-01 02:57:52 +0000
committerJeremy Allison <jra@samba.org>2002-03-01 02:57:52 +0000
commita93740935fb93f55b98847ff41a4bf7e9b5d1320 (patch)
tree0c8183cfbf681872ff0a96550865b255ffa8a2ad /source3
parent75de5a5dfa4ccd2f46e9f1bddad7ca2d0d2e665e (diff)
downloadsamba-a93740935fb93f55b98847ff41a4bf7e9b5d1320.tar.gz
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Cause nmbd to take signal processing in-band, rather than in
signal handlers. THIS NEEDS TESTING ! Jeremy. (This used to be commit 166d2a6144f929baecd83bdd855f6ada06cb51a6)
Diffstat (limited to 'source3')
-rw-r--r--source3/nmbd/nmbd.c707
1 files changed, 368 insertions, 339 deletions
diff --git a/source3/nmbd/nmbd.c b/source3/nmbd/nmbd.c
index 9ed8dd92b6..62e3f1757b 100644
--- a/source3/nmbd/nmbd.c
+++ b/source3/nmbd/nmbd.c
@@ -2,6 +2,7 @@
Unix SMB/CIFS implementation.
NBT netbios routines and daemon - version 2
Copyright (C) Andrew Tridgell 1994-1998
+ Copyright (C) Jeremy Allison 1997-2002
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
@@ -17,11 +18,6 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- Revision History:
-
- 14 jan 96: lkcl@pires.co.uk
- added multiple workgroup domain master support
-
*/
#include "includes.h"
@@ -47,136 +43,140 @@ BOOL found_lm_clients = False;
time_t StartupTime = 0;
/**************************************************************************** **
- catch a sigterm
+ Handle a SIGTERM in band.
**************************************************************************** */
-static void sig_term(int sig)
+
+static void terminate(void)
{
- BlockSignals(True,SIGTERM);
-
- DEBUG(0,("Got SIGTERM: going down...\n"));
+ DEBUG(0,("Got SIGTERM: going down...\n"));
- /* Write out wins.dat file if samba is a WINS server */
- wins_write_database(False);
+ /* Write out wins.dat file if samba is a WINS server */
+ wins_write_database(False);
- /* Remove all SELF registered names. */
- release_my_names();
+ /* Remove all SELF registered names. */
+ release_my_names();
- /* Announce all server entries as 0 time-to-live, 0 type. */
- announce_my_servers_removed();
-
- /* If there was an async dns child - kill it. */
- kill_async_dns_child();
+ /* Announce all server entries as 0 time-to-live, 0 type. */
+ announce_my_servers_removed();
- exit(0);
+ /* If there was an async dns child - kill it. */
+ kill_async_dns_child();
-} /* sig_term */
+ exit(0);
+}
/**************************************************************************** **
- catch a sighup
+ Catch a SIGTERM signal.
**************************************************************************** */
-static VOLATILE sig_atomic_t reload_after_sighup = False;
-
-static void sig_hup(int sig)
-{
- BlockSignals( True, SIGHUP );
-
- DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
- write_browse_list( 0, True );
+static VOLATILE sig_atomic_t got_sig_term;
- dump_all_namelists();
-
- reload_after_sighup = True;
+static void sig_term(int sig)
+{
+ got_sig_term = 1;
+ sys_select_signal();
+}
- BlockSignals(False,SIGHUP);
+/**************************************************************************** **
+ Catch a SIGHUP signal.
+ **************************************************************************** */
-} /* sig_hup */
+static VOLATILE sig_atomic_t reload_after_sighup;
+static void sig_hup(int sig)
+{
+ reload_after_sighup = 1;
+ sys_select_signal();
+}
#if DUMP_CORE
/**************************************************************************** **
- prepare to dump a core file - carefully!
+ Prepare to dump a core file - carefully!
**************************************************************************** */
+
static BOOL dump_core(void)
{
- char *p;
- pstring dname;
- pstrcpy( dname, lp_logfile() );
- if ((p=strrchr_m(dname,'/')))
- *p=0;
- pstrcat( dname, "/corefiles" );
- mkdir( dname, 0700 );
- sys_chown( dname, getuid(), getgid() );
- chmod( dname, 0700 );
- if ( chdir(dname) )
- return( False );
- umask( ~(0700) );
+ char *p;
+ pstring dname;
+ pstrcpy( dname, lp_logfile() );
+ if ((p=strrchr_m(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 ) );
- }
+ {
+ 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 );
-} /* dump_core */
+ DEBUG(0,("Dumping core in %s\n",dname));
+ abort();
+ return( True );
+}
#endif
-
/**************************************************************************** **
- possibly continue after a fault
+ Possibly continue after a fault.
**************************************************************************** */
+
static void fault_continue(void)
{
#if DUMP_CORE
- dump_core();
+ dump_core();
#endif
-} /* fault_continue */
+}
/**************************************************************************** **
- expire old names from the namelist and server list
+ Expire old names from the namelist and server list.
**************************************************************************** */
+
static void expire_names_and_servers(time_t t)
{
- static time_t lastrun = 0;
+ static time_t lastrun = 0;
- if ( !lastrun )
- lastrun = t;
- if ( t < (lastrun + 5) )
- return;
- lastrun = t;
+ if ( !lastrun )
+ lastrun = t;
+ if ( t < (lastrun + 5) )
+ return;
+ lastrun = t;
- /*
- * Expire any timed out names on all the broadcast
- * subnets and those registered with the WINS server.
- * (nmbd_namelistdb.c)
- */
- expire_names(t);
+ /*
+ * Expire any timed out names on all the broadcast
+ * subnets and those registered with the WINS server.
+ * (nmbd_namelistdb.c)
+ */
- /*
- * Go through all the broadcast subnets and for each
- * workgroup known on that subnet remove any expired
- * server names. If a workgroup has an empty serverlist
- * and has itself timed out then remove the workgroup.
- * (nmbd_workgroupdb.c)
- */
- expire_workgroups_and_servers(t);
-} /* expire_names_and_servers */
+ expire_names(t);
+ /*
+ * Go through all the broadcast subnets and for each
+ * workgroup known on that subnet remove any expired
+ * server names. If a workgroup has an empty serverlist
+ * and has itself timed out then remove the workgroup.
+ * (nmbd_workgroupdb.c)
+ */
+
+ expire_workgroups_and_servers(t);
+}
/************************************************************************** **
-reload the list of network interfaces
+ Reload the list of network interfaces.
************************************************************************** */
+
static BOOL reload_interfaces(time_t t)
{
static time_t lastt;
@@ -253,293 +253,321 @@ static BOOL reload_interfaces(time_t t)
return False;
}
-
-
/**************************************************************************** **
- reload the services file
+ Reload the services file.
**************************************************************************** */
+
static BOOL reload_nmbd_services(BOOL test)
{
- BOOL ret;
- extern fstring remote_machine;
+ BOOL ret;
+ extern fstring remote_machine;
- fstrcpy( remote_machine, "nmbd" );
+ fstrcpy( remote_machine, "nmbd" );
- if ( lp_loaded() )
- {
- pstring fname;
- pstrcpy( fname,lp_configfile());
- if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE))
- {
- pstrcpy(dyn_CONFIGFILE,fname);
- test = False;
- }
- }
+ if ( lp_loaded() ) {
+ pstring fname;
+ pstrcpy( fname,lp_configfile());
+ if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
+ pstrcpy(dyn_CONFIGFILE,fname);
+ test = False;
+ }
+ }
- if ( test && !lp_file_list_changed() )
- return(True);
+ if ( test && !lp_file_list_changed() )
+ return(True);
- ret = lp_load( dyn_CONFIGFILE, True , False, False);
+ ret = lp_load( dyn_CONFIGFILE, True , False, False);
- /* perhaps the config filename is now set */
- if ( !test )
- {
- DEBUG( 3, ( "services not loaded\n" ) );
- reload_nmbd_services( True );
- }
+ /* perhaps the config filename is now set */
+ if ( !test ) {
+ DEBUG( 3, ( "services not loaded\n" ) );
+ reload_nmbd_services( True );
+ }
- /* Do a sanity check for a misconfigured nmbd */
- if( lp_wins_support() && wins_srv_count() )
- {
- if( DEBUGLVL(0) )
- {
- dbgtext( "ERROR: 'wins support = true' and 'wins server = <server>'\n" );
- dbgtext( "are conflicting settings. nmbd aborting.\n" );
- }
- exit(10);
- }
+ /* Do a sanity check for a misconfigured nmbd */
+ if( lp_wins_support() && wins_srv_count() ) {
+ if( DEBUGLVL(0) ) {
+ dbgtext( "ERROR: 'wins support = true' and 'wins server = <server>'\n" );
+ dbgtext( "are conflicting settings. nmbd aborting.\n" );
+ }
+ exit(10);
+ }
- return(ret);
-} /* reload_nmbd_services */
+ return(ret);
+}
/**************************************************************************** **
The main select loop.
**************************************************************************** */
+
static void process(void)
{
- BOOL run_election;
+ BOOL run_election;
- while( True )
- {
- time_t t = time(NULL);
-
- /* check for internal messages */
- message_dispatch();
-
- /*
- * Check all broadcast subnets to see if
- * we need to run an election on any of them.
- * (nmbd_elections.c)
- */
- run_election = check_elections();
-
- /*
- * Read incoming UDP packets.
- * (nmbd_packets.c)
- */
- if(listen_for_packets(run_election))
- return;
-
- /*
- * Process all incoming packets
- * read above. This calls the success and
- * failure functions registered when response
- * packets arrrive, and also deals with request
- * packets from other sources.
- * (nmbd_packets.c)
- */
- run_packet_queue();
-
- /*
- * Run any elections - initiate becoming
- * a local master browser if we have won.
- * (nmbd_elections.c)
- */
- run_elections(t);
-
- /*
- * Send out any broadcast announcements
- * of our server names. This also announces
- * the workgroup name if we are a local
- * master browser.
- * (nmbd_sendannounce.c)
- */
- announce_my_server_names(t);
-
- /*
- * Send out any LanMan broadcast announcements
- * of our server names.
- * (nmbd_sendannounce.c)
- */
- announce_my_lm_server_names(t);
-
- /*
- * If we are a local master browser, periodically
- * announce ourselves to the domain master browser.
- * This also deals with syncronising the domain master
- * browser server lists with ourselves as a local
- * master browser.
- * (nmbd_sendannounce.c)
- */
- announce_myself_to_domain_master_browser(t);
-
- /*
- * Fullfill any remote announce requests.
- * (nmbd_sendannounce.c)
- */
- announce_remote(t);
-
- /*
- * Fullfill any remote browse sync announce requests.
- * (nmbd_sendannounce.c)
- */
- browse_sync_remote(t);
-
- /*
- * Scan the broadcast subnets, and WINS client
- * namelists and refresh any that need refreshing.
- * (nmbd_mynames.c)
- */
- refresh_my_names(t);
-
- /*
- * Scan the subnet namelists and server lists and
- * expire thos that have timed out.
- * (nmbd.c)
- */
- expire_names_and_servers(t);
-
- /*
- * Write out a snapshot of our current browse list into
- * the browse.dat file. This is used by smbd to service
- * incoming NetServerEnum calls - used to synchronise
- * browse lists over subnets.
- * (nmbd_serverlistdb.c)
- */
- write_browse_list(t, False);
-
- /*
- * If we are a domain master browser, we have a list of
- * local master browsers we should synchronise browse
- * lists with (these are added by an incoming local
- * master browser announcement packet). Expire any of
- * these that are no longer current, and pull the server
- * lists from each of these known local master browsers.
- * (nmbd_browsesync.c)
- */
- dmb_expire_and_sync_browser_lists(t);
-
- /*
- * Check that there is a local master browser for our
- * workgroup for all our broadcast subnets. If one
- * is not found, start an election (which we ourselves
- * may or may not participate in, depending on the
- * setting of the 'local master' parameter.
- * (nmbd_elections.c)
- */
- check_master_browser_exists(t);
-
- /*
- * If we are configured as a logon server, attempt to
- * register the special NetBIOS names to become such
- * (WORKGROUP<1c> name) on all broadcast subnets and
- * with the WINS server (if used). If we are configured
- * to become a domain master browser, attempt to register
- * the special NetBIOS name (WORKGROUP<1b> name) to
- * become such.
- * (nmbd_become_dmb.c)
- */
- add_domain_names(t);
-
- /*
- * If we are a WINS server, do any timer dependent
- * processing required.
- * (nmbd_winsserver.c)
- */
- initiate_wins_processing(t);
-
- /*
- * If we are a domain master browser, attempt to contact the
- * WINS server to get a list of all known WORKGROUPS/DOMAINS.
- * This will only work to a Samba WINS server.
- * (nmbd_browsesync.c)
- */
- if (lp_enhanced_browsing()) {
- collect_all_workgroup_names_from_wins_server(t);
- }
+ while( True ) {
+ time_t t = time(NULL);
- /*
- * Go through the response record queue and time out or re-transmit
- * and expired entries.
- * (nmbd_packets.c)
- */
- retransmit_or_expire_response_records(t);
-
- /*
- * check to see if any remote browse sync child processes have completed
- */
- sync_check_completion();
-
- /*
- * regularly sync with any other DMBs we know about
- */
- if (lp_enhanced_browsing()) {
- sync_all_dmbs(t);
- }
+ /* Check for internal messages */
+
+ message_dispatch();
+
+ /*
+ * Check all broadcast subnets to see if
+ * we need to run an election on any of them.
+ * (nmbd_elections.c)
+ */
- /*
- * clear the unexpected packet queue
- */
- clear_unexpected(t);
+ run_election = check_elections();
- /*
- * Reload the services file if we got a sighup.
- */
+ /*
+ * Read incoming UDP packets.
+ * (nmbd_packets.c)
+ */
- if(reload_after_sighup) {
- reload_nmbd_services( True );
- reopen_logs();
- if(reload_interfaces(0))
+ if(listen_for_packets(run_election))
return;
- reload_after_sighup = False;
- }
- /* check for new network interfaces */
- if(reload_interfaces(t))
- return;
+ /*
+ * Handle termination inband.
+ */
- /* free up temp memory */
- lp_talloc_free();
- }
-} /* process */
+ if (got_sig_term) {
+ got_sig_term = 0;
+ terminate();
+ }
+
+ /*
+ * Process all incoming packets
+ * read above. This calls the success and
+ * failure functions registered when response
+ * packets arrrive, and also deals with request
+ * packets from other sources.
+ * (nmbd_packets.c)
+ */
+
+ run_packet_queue();
+
+ /*
+ * Run any elections - initiate becoming
+ * a local master browser if we have won.
+ * (nmbd_elections.c)
+ */
+
+ run_elections(t);
+
+ /*
+ * Send out any broadcast announcements
+ * of our server names. This also announces
+ * the workgroup name if we are a local
+ * master browser.
+ * (nmbd_sendannounce.c)
+ */
+
+ announce_my_server_names(t);
+ /*
+ * Send out any LanMan broadcast announcements
+ * of our server names.
+ * (nmbd_sendannounce.c)
+ */
+
+ announce_my_lm_server_names(t);
+
+ /*
+ * If we are a local master browser, periodically
+ * announce ourselves to the domain master browser.
+ * This also deals with syncronising the domain master
+ * browser server lists with ourselves as a local
+ * master browser.
+ * (nmbd_sendannounce.c)
+ */
+
+ announce_myself_to_domain_master_browser(t);
+
+ /*
+ * Fullfill any remote announce requests.
+ * (nmbd_sendannounce.c)
+ */
+
+ announce_remote(t);
+
+ /*
+ * Fullfill any remote browse sync announce requests.
+ * (nmbd_sendannounce.c)
+ */
+
+ browse_sync_remote(t);
+
+ /*
+ * Scan the broadcast subnets, and WINS client
+ * namelists and refresh any that need refreshing.
+ * (nmbd_mynames.c)
+ */
+
+ refresh_my_names(t);
+
+ /*
+ * Scan the subnet namelists and server lists and
+ * expire thos that have timed out.
+ * (nmbd.c)
+ */
+
+ expire_names_and_servers(t);
+
+ /*
+ * Write out a snapshot of our current browse list into
+ * the browse.dat file. This is used by smbd to service
+ * incoming NetServerEnum calls - used to synchronise
+ * browse lists over subnets.
+ * (nmbd_serverlistdb.c)
+ */
+
+ write_browse_list(t, False);
+
+ /*
+ * If we are a domain master browser, we have a list of
+ * local master browsers we should synchronise browse
+ * lists with (these are added by an incoming local
+ * master browser announcement packet). Expire any of
+ * these that are no longer current, and pull the server
+ * lists from each of these known local master browsers.
+ * (nmbd_browsesync.c)
+ */
+
+ dmb_expire_and_sync_browser_lists(t);
+
+ /*
+ * Check that there is a local master browser for our
+ * workgroup for all our broadcast subnets. If one
+ * is not found, start an election (which we ourselves
+ * may or may not participate in, depending on the
+ * setting of the 'local master' parameter.
+ * (nmbd_elections.c)
+ */
+
+ check_master_browser_exists(t);
+
+ /*
+ * If we are configured as a logon server, attempt to
+ * register the special NetBIOS names to become such
+ * (WORKGROUP<1c> name) on all broadcast subnets and
+ * with the WINS server (if used). If we are configured
+ * to become a domain master browser, attempt to register
+ * the special NetBIOS name (WORKGROUP<1b> name) to
+ * become such.
+ * (nmbd_become_dmb.c)
+ */
+
+ add_domain_names(t);
+
+ /*
+ * If we are a WINS server, do any timer dependent
+ * processing required.
+ * (nmbd_winsserver.c)
+ */
+
+ initiate_wins_processing(t);
+
+ /*
+ * If we are a domain master browser, attempt to contact the
+ * WINS server to get a list of all known WORKGROUPS/DOMAINS.
+ * This will only work to a Samba WINS server.
+ * (nmbd_browsesync.c)
+ */
+
+ if (lp_enhanced_browsing())
+ collect_all_workgroup_names_from_wins_server(t);
+
+ /*
+ * Go through the response record queue and time out or re-transmit
+ * and expired entries.
+ * (nmbd_packets.c)
+ */
+
+ retransmit_or_expire_response_records(t);
+
+ /*
+ * check to see if any remote browse sync child processes have completed
+ */
+
+ sync_check_completion();
+
+ /*
+ * regularly sync with any other DMBs we know about
+ */
+
+ if (lp_enhanced_browsing())
+ sync_all_dmbs(t);
+
+ /*
+ * clear the unexpected packet queue
+ */
+
+ clear_unexpected(t);
+
+ /*
+ * Reload the services file if we got a sighup.
+ */
+
+ if(reload_after_sighup) {
+ DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
+ write_browse_list( 0, True );
+ dump_all_namelists();
+ reload_nmbd_services( True );
+ reopen_logs();
+ if(reload_interfaces(0))
+ return;
+ reload_after_sighup = 0;
+ }
+
+ /* check for new network interfaces */
+
+ if(reload_interfaces(t))
+ return;
+
+ /* free up temp memory */
+ lp_talloc_free();
+ }
+}
/**************************************************************************** **
- open the socket communication
+ Open the socket communication.
**************************************************************************** */
+
static BOOL open_sockets(BOOL isdaemon, int port)
{
- /* The sockets opened here will be used to receive broadcast
- packets *only*. Interface specific sockets are opened in
- make_subnet() in namedbsubnet.c. Thus we bind to the
- address "0.0.0.0". The parameter 'socket address' is
- now deprecated.
- */
-
- if ( isdaemon )
- ClientNMB = open_socket_in(SOCK_DGRAM, port,0,0,True);
- else
- ClientNMB = 0;
+ /*
+ * The sockets opened here will be used to receive broadcast
+ * packets *only*. Interface specific sockets are opened in
+ * make_subnet() in namedbsubnet.c. Thus we bind to the
+ * address "0.0.0.0". The parameter 'socket address' is
+ * now deprecated.
+ */
+
+ if ( isdaemon )
+ ClientNMB = open_socket_in(SOCK_DGRAM, port,0,0,True);
+ else
+ ClientNMB = 0;
- ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3,0,True);
+ ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3,0,True);
- if ( ClientNMB == -1 )
- return( False );
+ if ( ClientNMB == -1 )
+ return( False );
- /* we are never interested in SIGPIPE */
- BlockSignals(True,SIGPIPE);
+ /* we are never interested in SIGPIPE */
+ BlockSignals(True,SIGPIPE);
- set_socket_options( ClientNMB, "SO_BROADCAST" );
- set_socket_options( ClientDGRAM, "SO_BROADCAST" );
-
- DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
- return( True );
-} /* open_sockets */
+ set_socket_options( ClientNMB, "SO_BROADCAST" );
+ set_socket_options( ClientDGRAM, "SO_BROADCAST" );
+ DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
+ return( True );
+}
/**************************************************************************** **
- initialise connect, service and file structs
+ Initialise connect, service and file structs.
**************************************************************************** */
+
static BOOL init_structs(void)
{
extern fstring local_machine;
@@ -626,11 +654,12 @@ static BOOL init_structs(void)
DEBUGADD( 5, ( "my_netbios_names[%d]=\"%s\"\n", n, my_netbios_names[n] ) );
return( True );
-} /* init_structs */
+}
/**************************************************************************** **
- usage on the program
+ Usage on the program.
**************************************************************************** */
+
static void usage(char *pname)
{
@@ -649,7 +678,7 @@ static void usage(char *pname)
printf( "\t-p port Listen on the specified port\n" );
printf( "\t-s configuration file Configuration file name\n" );
printf( "\n");
-} /* usage */
+}
/**************************************************************************** **
@@ -877,4 +906,4 @@ static void usage(char *pname)
if (dbf)
x_fclose(dbf);
return(0);
-} /* main */
+}