diff options
Diffstat (limited to 'source4/nmbd/nmbd_become_lmb.c')
| -rw-r--r-- | source4/nmbd/nmbd_become_lmb.c | 605 |
1 files changed, 0 insertions, 605 deletions
diff --git a/source4/nmbd/nmbd_become_lmb.c b/source4/nmbd/nmbd_become_lmb.c deleted file mode 100644 index 8b87ca7444..0000000000 --- a/source4/nmbd/nmbd_become_lmb.c +++ /dev/null @@ -1,605 +0,0 @@ -/* - Unix SMB/CIFS implementation. - NBT netbios routines and daemon - version 2 - Copyright (C) Andrew Tridgell 1994-1998 - Copyright (C) Luke Kenneth Casson Leighton 1994-1998 - Copyright (C) Jeremy Allison 1994-1998 - - 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" - -extern uint16 samba_nb_type; /* Samba's NetBIOS name type. */ - -/******************************************************************* - Utility function to add a name to the unicast subnet, or add in - our IP address if it already exists. -******************************************************************/ - -void insert_permanent_name_into_unicast( struct subnet_record *subrec, - struct nmb_name *nmbname, uint16 nb_type ) -{ - struct name_record *namerec; - - if((namerec = find_name_on_subnet(unicast_subnet, nmbname, FIND_SELF_NAME)) == NULL) - { - /* The name needs to be created on the unicast subnet. */ - (void)add_name_to_subnet( unicast_subnet, nmbname->name, - nmbname->name_type, nb_type, - PERMANENT_TTL, PERMANENT_NAME, 1, &subrec->myip); - } - else - { - /* The name already exists on the unicast subnet. Add our local - IP for the given broadcast subnet to the name. */ - add_ip_to_name_record( namerec, subrec->myip); - } -} - -/******************************************************************* - Utility function to remove a name from the unicast subnet. -******************************************************************/ - -static void remove_permanent_name_from_unicast( struct subnet_record *subrec, - struct nmb_name *nmbname ) -{ - struct name_record *namerec; - - if((namerec = find_name_on_subnet(unicast_subnet, nmbname, FIND_SELF_NAME)) != NULL) - { - /* Remove this broadcast subnet IP address from the name. */ - remove_ip_from_name_record( namerec, subrec->myip); - if(namerec->data.num_ips == 0) - remove_name_from_namelist( unicast_subnet, namerec); - } -} - -/******************************************************************* - Utility function always called to set our workgroup and server - state back to potential browser, or none. -******************************************************************/ - -static void reset_workgroup_state( struct subnet_record *subrec, char *workgroup_name, - BOOL force_new_election ) -{ - struct work_record *work; - struct server_record *servrec; - struct nmb_name nmbname; - - if((work = find_workgroup_on_subnet( subrec, workgroup_name)) == NULL) - { - DEBUG(0,("reset_workgroup_state: Error - cannot find workgroup %s on \ -subnet %s.\n", workgroup_name, subrec->subnet_name )); - return; - } - - if((servrec = find_server_in_workgroup( work, lp_netbios_name())) == NULL) - { - DEBUG(0,("reset_workgroup_state: Error - cannot find server %s \ -in workgroup %s on subnet %s\n", - lp_netbios_name(), work->work_group, subrec->subnet_name)); - work->mst_state = lp_local_master() ? MST_POTENTIAL : MST_NONE; - return; - } - - /* Update our server status - remove any master flag and replace - it with the potential browser flag. */ - servrec->serv.type &= ~SV_TYPE_MASTER_BROWSER; - servrec->serv.type |= (lp_local_master() ? SV_TYPE_POTENTIAL_BROWSER : 0); - - /* Tell the namelist writer to write out a change. */ - subrec->work_changed = True; - - /* Reset our election flags. */ - work->ElectionCriterion &= ~0x4; - - work->mst_state = lp_local_master() ? MST_POTENTIAL : MST_NONE; - - /* Forget who the local master browser was for - this workgroup. */ - - set_workgroup_local_master_browser_name( work, ""); - - /* - * Ensure the IP address of this subnet is not registered as one - * of the IP addresses of the WORKGROUP<1d> name on the unicast - * subnet. This undoes what we did below when we became a local - * master browser. - */ - - make_nmb_name(&nmbname, work->work_group, 0x1d); - - remove_permanent_name_from_unicast( subrec, &nmbname); - - if(force_new_election) - work->needelection = True; -} - -/******************************************************************* - Unbecome the local master browser name release success function. -******************************************************************/ - -static void unbecome_local_master_success(struct subnet_record *subrec, - struct userdata_struct *userdata, - struct nmb_name *released_name, - struct in_addr released_ip) -{ - BOOL force_new_election = False; - - memcpy((char *)&force_new_election, userdata->data, sizeof(BOOL)); - - DEBUG(3,("unbecome_local_master_success: released name %s.\n", - nmb_namestr(released_name))); - - /* Now reset the workgroup and server state. */ - reset_workgroup_state( subrec, released_name->name, force_new_election ); - - if( DEBUGLVL( 0 ) ) - { - dbgtext( "*****\n\n" ); - dbgtext( "Samba name server %s ", lp_netbios_name() ); - dbgtext( "has stopped being a local master browser " ); - dbgtext( "for workgroup %s ", released_name->name ); - dbgtext( "on subnet %s\n\n*****\n", subrec->subnet_name ); - } - -} - -/******************************************************************* - Unbecome the local master browser name release fail function. -******************************************************************/ - -static void unbecome_local_master_fail(struct subnet_record *subrec, struct response_record *rrec, - struct nmb_name *fail_name) -{ - struct name_record *namerec; - struct userdata_struct *userdata = rrec->userdata; - BOOL force_new_election = False; - - memcpy((char *)&force_new_election, userdata->data, sizeof(BOOL)); - - DEBUG(0,("unbecome_local_master_fail: failed to release name %s. \ -Removing from namelist anyway.\n", nmb_namestr(fail_name))); - - /* Do it anyway. */ - namerec = find_name_on_subnet(subrec, fail_name, FIND_SELF_NAME); - if(namerec) - remove_name_from_namelist(subrec, namerec); - - /* Now reset the workgroup and server state. */ - reset_workgroup_state( subrec, fail_name->name, force_new_election ); - - if( DEBUGLVL( 0 ) ) - { - dbgtext( "*****\n\n" ); - dbgtext( "Samba name server %s ", lp_netbios_name() ); - dbgtext( "has stopped being a local master browser " ); - dbgtext( "for workgroup %s ", fail_name->name ); - dbgtext( "on subnet %s\n\n*****\n", subrec->subnet_name ); - } -} - -/******************************************************************* - Utility function to remove the WORKGROUP<1d> name. -******************************************************************/ - -static void release_1d_name( struct subnet_record *subrec, char *workgroup_name, - BOOL force_new_election) -{ - struct nmb_name nmbname; - struct name_record *namerec; - - make_nmb_name(&nmbname, workgroup_name, 0x1d); - if((namerec = find_name_on_subnet( subrec, &nmbname, FIND_SELF_NAME))!=NULL) - { - struct userdata_struct *userdata; - int size = sizeof(struct userdata_struct) + sizeof(BOOL); - - if((userdata = (struct userdata_struct *)malloc(size)) == NULL) - { - DEBUG(0,("release_1d_name: malloc fail.\n")); - return; - } - - userdata->copy_fn = NULL; - userdata->free_fn = NULL; - userdata->userdata_len = sizeof(BOOL); - memcpy((char *)userdata->data, &force_new_election, sizeof(BOOL)); - - release_name(subrec, namerec, - unbecome_local_master_success, - unbecome_local_master_fail, - userdata); - - zero_free(userdata, size); - } -} - -/******************************************************************* - Unbecome the local master browser MSBROWSE name release success function. -******************************************************************/ - -static void release_msbrowse_name_success(struct subnet_record *subrec, - struct userdata_struct *userdata, - struct nmb_name *released_name, - struct in_addr released_ip) -{ - DEBUG(4,("release_msbrowse_name_success: Released name %s on subnet %s\n.", - nmb_namestr(released_name), subrec->subnet_name )); - - /* Remove the permanent MSBROWSE name added into the unicast subnet. */ - remove_permanent_name_from_unicast( subrec, released_name); -} - -/******************************************************************* - Unbecome the local master browser MSBROWSE name release fail function. -******************************************************************/ - -static void release_msbrowse_name_fail( struct subnet_record *subrec, - struct response_record *rrec, - struct nmb_name *fail_name) -{ - struct name_record *namerec; - - DEBUG(4,("release_msbrowse_name_fail: Failed to release name %s on subnet %s\n.", - nmb_namestr(fail_name), subrec->subnet_name )); - - /* Release the name anyway. */ - namerec = find_name_on_subnet(subrec, fail_name, FIND_SELF_NAME); - if(namerec) - remove_name_from_namelist(subrec, namerec); - - /* Remove the permanent MSBROWSE name added into the unicast subnet. */ - remove_permanent_name_from_unicast( subrec, fail_name); -} - -/******************************************************************* - Unbecome the local master browser. If force_new_election is true, restart - the election process after we've unbecome the local master. -******************************************************************/ - -void unbecome_local_master_browser(struct subnet_record *subrec, struct work_record *work, - BOOL force_new_election) -{ - struct name_record *namerec; - struct nmb_name nmbname; - - /* Sanity check. */ - - DEBUG(2,("unbecome_local_master_browser: unbecoming local master for workgroup %s \ -on subnet %s\n",work->work_group, subrec->subnet_name)); - - if(find_server_in_workgroup( work, lp_netbios_name()) == NULL) - { - DEBUG(0,("unbecome_local_master_browser: Error - cannot find server %s \ -in workgroup %s on subnet %s\n", - lp_netbios_name(), work->work_group, subrec->subnet_name)); - work->mst_state = lp_local_master() ? MST_POTENTIAL : MST_NONE; - return; - } - - /* Set the state to unbecoming. */ - work->mst_state = MST_UNBECOMING_MASTER; - - /* - * Release the WORKGROUP<1d> name asap to allow another machine to - * claim it. - */ - - release_1d_name( subrec, work->work_group, force_new_election); - - /* Deregister any browser names we may have. */ - make_nmb_name(&nmbname, MSBROWSE, 0x1); - if((namerec = find_name_on_subnet( subrec, &nmbname, FIND_SELF_NAME))!=NULL) - { - release_name(subrec, namerec, - release_msbrowse_name_success, - release_msbrowse_name_fail, - NULL); - } - - /* - * Ensure we have sent and processed these release packets - * before returning - we don't want to process any election - * packets before dealing with the 1d release. - */ - - retransmit_or_expire_response_records(time(NULL)); -} - -/**************************************************************************** - Success in registering the WORKGROUP<1d> name. - We are now *really* a local master browser. - ****************************************************************************/ - -static void become_local_master_stage2(struct subnet_record *subrec, - struct userdata_struct *userdata, - struct nmb_name *registered_name, - uint16 nb_flags, - int ttl, struct in_addr registered_ip) -{ - int i = 0; - struct server_record *sl; - struct work_record *work = find_workgroup_on_subnet( subrec, registered_name->name); - struct server_record *servrec; - - if(!work) - { - DEBUG(0,("become_local_master_stage2: Error - cannot find \ -workgroup %s on subnet %s\n", registered_name->name, subrec->subnet_name)); - return; - } - - if((servrec = find_server_in_workgroup( work, lp_netbios_name())) == NULL) - { - DEBUG(0,("become_local_master_stage2: Error - cannot find server %s \ -in workgroup %s on subnet %s\n", - lp_netbios_name(), registered_name->name, subrec->subnet_name)); - work->mst_state = lp_local_master() ? MST_POTENTIAL : MST_NONE; - return; - } - - DEBUG(3,("become_local_master_stage2: registered as master browser for workgroup %s \ -on subnet %s\n", work->work_group, subrec->subnet_name)); - - work->mst_state = MST_BROWSER; /* registering WORKGROUP(1d) succeeded */ - - /* update our server status */ - servrec->serv.type |= SV_TYPE_MASTER_BROWSER; - servrec->serv.type &= ~SV_TYPE_POTENTIAL_BROWSER; - - /* Tell the namelist writer to write out a change. */ - subrec->work_changed = True; - - /* Add this name to the workgroup as local master browser. */ - set_workgroup_local_master_browser_name( work, lp_netbios_name()); - - /* Count the number of servers we have on our list. If it's - less than 10 (just a heuristic) request the servers - to announce themselves. - */ - for( sl = work->serverlist; sl != NULL; sl = sl->next) - i++; - - if (i < 10) - { - /* Ask all servers on our local net to announce to us. */ - broadcast_announce_request(subrec, work); - } - - /* - * Now we are a local master on a broadcast subnet, we need to add - * the WORKGROUP<1d> name to the unicast subnet so that we can answer - * unicast requests sent to this name. We can create this name directly on - * the unicast subnet as a WINS server always returns true when registering - * this name, and discards the registration. We use the number of IP - * addresses registered to this name as a reference count, as we - * remove this broadcast subnet IP address from it when we stop becoming a local - * master browser for this broadcast subnet. - */ - - insert_permanent_name_into_unicast( subrec, registered_name, nb_flags); - - /* Reset the announce master browser timer so that we try and tell a domain - master browser as soon as possible that we are a local master browser. */ - reset_announce_timer(); - - if( DEBUGLVL( 0 ) ) - { - dbgtext( "*****\n\n" ); - dbgtext( "Samba name server %s ", lp_netbios_name() ); - dbgtext( "is now a local master browser " ); - dbgtext( "for workgroup %s ", work->work_group ); - dbgtext( "on subnet %s\n\n*****\n", subrec->subnet_name ); - } - -} - -/**************************************************************************** - Failed to register the WORKGROUP<1d> name. - ****************************************************************************/ -static void become_local_master_fail2(struct subnet_record *subrec, - struct response_record *rrec, - struct nmb_name *fail_name) -{ - struct work_record *work = find_workgroup_on_subnet( subrec, fail_name->name); - - DEBUG(0,("become_local_master_fail2: failed to register name %s on subnet %s. \ -Failed to become a local master browser.\n", nmb_namestr(fail_name), subrec->subnet_name)); - - if(!work) - { - DEBUG(0,("become_local_master_fail2: Error - cannot find \ -workgroup %s on subnet %s\n", fail_name->name, subrec->subnet_name)); - return; - } - - /* Roll back all the way by calling unbecome_local_master_browser(). */ - unbecome_local_master_browser(subrec, work, False); -} - -/**************************************************************************** - Success in registering the MSBROWSE name. - ****************************************************************************/ - -static void become_local_master_stage1(struct subnet_record *subrec, - struct userdata_struct *userdata, - struct nmb_name *registered_name, - uint16 nb_flags, - int ttl, struct in_addr registered_ip) -{ - char *work_name = userdata->data; - struct work_record *work = find_workgroup_on_subnet( subrec, work_name); - - if(!work) - { - DEBUG(0,("become_local_master_stage1: Error - cannot find \ -workgroup %s on subnet %s\n", work_name, subrec->subnet_name)); - return; - } - - DEBUG(3,("become_local_master_stage1: go to stage 2: register the %s<1d> name.\n", - work->work_group)); - - work->mst_state = MST_MSB; /* Registering MSBROWSE was successful. */ - - /* - * We registered the MSBROWSE name on a broadcast subnet, now need to add - * the MSBROWSE name to the unicast subnet so that we can answer - * unicast requests sent to this name. We create this name directly on - * the unicast subnet. - */ - - insert_permanent_name_into_unicast( subrec, registered_name, nb_flags); - - /* Attempt to register the WORKGROUP<1d> name. */ - register_name(subrec, work->work_group,0x1d,samba_nb_type, - become_local_master_stage2, - become_local_master_fail2, - NULL); -} - -/**************************************************************************** - Failed to register the MSBROWSE name. - ****************************************************************************/ - -static void become_local_master_fail1(struct subnet_record *subrec, - struct response_record *rrec, - struct nmb_name *fail_name) -{ - char *work_name = rrec->userdata->data; - struct work_record *work = find_workgroup_on_subnet(subrec, work_name); - - if(!work) - { - DEBUG(0,("become_local_master_fail1: Error - cannot find \ -workgroup %s on subnet %s\n", work_name, subrec->subnet_name)); - return; - } - - if(find_server_in_workgroup(work, lp_netbios_name()) == NULL) - { - DEBUG(0,("become_local_master_fail1: Error - cannot find server %s \ -in workgroup %s on subnet %s\n", - lp_netbios_name(), work->work_group, subrec->subnet_name)); - return; - } - - reset_workgroup_state( subrec, work->work_group, False ); - - DEBUG(0,("become_local_master_fail1: Failed to become a local master browser for \ -workgroup %s on subnet %s. Couldn't register name %s.\n", - work->work_group, subrec->subnet_name, nmb_namestr(fail_name))); -} - -/****************************************************************** - Become the local master browser on a subnet. - This gets called if we win an election on this subnet. - - Stage 1: mst_state was MST_POTENTIAL - go to MST_BACK register ^1^2__MSBROWSE__^2^1. - Stage 2: mst_state was MST_BACKUP - go to MST_MSB and register WORKGROUP<1d>. - Stage 3: mst_state was MST_MSB - go to MST_BROWSER. -******************************************************************/ - -void become_local_master_browser(struct subnet_record *subrec, struct work_record *work) -{ - struct userdata_struct *userdata; - int size = sizeof(struct userdata_struct) + sizeof(fstring) + 1; - - /* Sanity check. */ - if (!lp_local_master()) - { - DEBUG(0,("become_local_master_browser: Samba not configured as a local master browser.\n")); - return; - } - - if(!AM_POTENTIAL_MASTER_BROWSER(work)) - { - DEBUG(2,("become_local_master_browser: Awaiting potential browser state. Current state is %d\n", - work->mst_state )); - return; - } - - if(find_server_in_workgroup( work, lp_netbios_name()) == NULL) - { - DEBUG(0,("become_local_master_browser: Error - cannot find server %s \ -in workgroup %s on subnet %s\n", - lp_netbios_name(), work->work_group, subrec->subnet_name)); - return; - } - - DEBUG(2,("become_local_master_browser: Starting to become a master browser for workgroup \ -%s on subnet %s\n", work->work_group, subrec->subnet_name)); - - DEBUG(3,("become_local_master_browser: first stage - attempt to register ^1^2__MSBROWSE__^2^1\n")); - work->mst_state = MST_BACKUP; /* an election win was successful */ - - work->ElectionCriterion |= 0x5; - - /* Tell the namelist writer to write out a change. */ - subrec->work_changed = True; - - /* Setup the userdata_struct. */ - if((userdata = (struct userdata_struct *)malloc(size)) == NULL) - { - DEBUG(0,("become_local_master_browser: malloc fail.\n")); - return; - } - - userdata->copy_fn = NULL; - userdata->free_fn = NULL; - userdata->userdata_len = strlen(work->work_group)+1; - fstrcpy(userdata->data, work->work_group); - - /* Register the special browser group name. */ - register_name(subrec, MSBROWSE, 0x01, samba_nb_type|NB_GROUP, - become_local_master_stage1, - become_local_master_fail1, - userdata); - - zero_free(userdata, size); -} - -/*************************************************************** - Utility function to set the local master browser name. Does - some sanity checking as old versions of Samba seem to sometimes - say that the master browser name for a workgroup is the same - as the workgroup name. -****************************************************************/ - -void set_workgroup_local_master_browser_name( struct work_record *work, const char *newname) -{ - DEBUG(5,("set_workgroup_local_master_browser_name: setting local master name to '%s' \ -for workgroup %s.\n", newname, work->work_group )); - -#if 0 - /* - * Apparently some sites use the workgroup name as the local - * master browser name. Arrrrggghhhhh ! (JRA). - */ - if(strequal( work->work_group, newname)) - { - DEBUG(5, ("set_workgroup_local_master_browser_name: Refusing to set \ -local_master_browser_name for workgroup %s to workgroup name.\n", - work->work_group )); - return; - } -#endif - - StrnCpy(work->local_master_browser_name, newname, - sizeof(work->local_master_browser_name)-1); -} |