diff options
Diffstat (limited to 'source/nameelect.c')
| -rw-r--r-- | source/nameelect.c | 850 |
1 files changed, 0 insertions, 850 deletions
diff --git a/source/nameelect.c b/source/nameelect.c deleted file mode 100644 index 2b4ebf091cc..00000000000 --- a/source/nameelect.c +++ /dev/null @@ -1,850 +0,0 @@ -/* - Unix SMB/Netbios implementation. - Version 1.9. - NBT netbios routines and daemon - version 2 - Copyright (C) Andrew Tridgell 1994-1997 - - 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. - - Module name: nameelect.c - - Revision History: - - 14 jan 96: lkcl@pires.co.uk - added multiple workgroup domain master support - - 04 jul 96: lkcl@pires.co.uk - added system to become a master browser by stages. - - -*/ - -#include "includes.h" - -extern int ClientNMB; -extern int ClientDGRAM; - -extern int DEBUGLEVEL; -extern pstring scope; - -extern pstring myname; -extern fstring myworkgroup; -extern struct in_addr ipzero; -extern struct in_addr wins_ip; - -/* here are my election parameters */ - -extern time_t StartupTime; - -extern struct subnet_record *subnetlist; - -extern uint16 nb_type; /* samba's NetBIOS name type */ - - -/******************************************************************* - occasionally check to see if the master browser is around - ******************************************************************/ -void check_master_browser(time_t t) -{ - static time_t lastrun=0; - struct subnet_record *d; - - if (!lastrun) lastrun = t; - if (t < lastrun + CHECK_TIME_MST_BROWSE * 60) return; - - lastrun = t; - - dump_workgroups(); - - for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_EXCLUDING_WINS(d)) - { - struct work_record *work; - - for (work = d->workgrouplist; work; work = work->next) - { - if (strequal(work->work_group, myworkgroup) && !AM_MASTER(work)) - { - if (lp_local_master()) - { - /* potential master browser - not a master browser. force - becoming a master browser, hence the log message. - */ - - DEBUG(2,("%s potential master for %s %s - force election\n", - timestring(), work->work_group, - inet_ntoa(d->bcast_ip))); - - browser_gone(work->work_group, d->bcast_ip); - } - else - { - /* if we are not the browse master of a workgroup, - and we can't find a browser on the subnet, do - something about it. - */ - - queue_netbios_packet(d,ClientNMB,NMB_QUERY,NAME_QUERY_MST_CHK, - work->work_group,0x1d,0,0,0,NULL,NULL, - True,False,d->bcast_ip,d->bcast_ip); - } - } - } - } -} - - -/******************************************************************* - what to do if a master browser DOESN't exist. - - option 1: force an election, and participate in it - option 2: force an election, and let everyone else participate. - - ******************************************************************/ -void browser_gone(char *work_name, struct in_addr ip) -{ - struct subnet_record *d = find_subnet(ip); - struct work_record *work = find_workgroupstruct(d, work_name, False); - - /* i don't know about this workgroup, therefore i don't care */ - if (!work || !d) return; - - /* don't do election stuff on the WINS subnet */ - if (ip_equal(d->bcast_ip,wins_ip)) - return; - - if (strequal(work->work_group, myworkgroup)) - { - - if (lp_local_master()) - { - /* we have discovered that there is no local master - browser, and we are configured to initiate - an election under exactly such circumstances. - */ - DEBUG(2,("Forcing election on %s %s\n", - work->work_group,inet_ntoa(d->bcast_ip))); - - /* we can attempt to become master browser */ - work->needelection = True; - } - else - { - /* we need to force an election, because we are configured - not to _become_ the local master, but we still _need_ one, - having detected that one doesn't exist. - */ - - /* local interfaces: force an election */ - send_election(d, work->work_group, 0, 0, myname); - - /* only removes workgroup completely on a local interface - persistent lmhosts entries on a local interface _will_ be removed). - */ - remove_workgroup(d, work,True); - add_workgroup_to_subnet(d, work->work_group); - } - } -} - - -/**************************************************************************** - send an election packet - **************************************************************************/ -void send_election(struct subnet_record *d, char *group,uint32 criterion, - int timeup,char *name) -{ - pstring outbuf; - char *p; - - if (!d) return; - - DEBUG(2,("Sending election to %s for workgroup %s\n", - inet_ntoa(d->bcast_ip),group)); - - bzero(outbuf,sizeof(outbuf)); - p = outbuf; - CVAL(p,0) = ANN_Election; /* election */ - p++; - - CVAL(p,0) = (criterion == 0 && timeup == 0) ? 0 : ELECTION_VERSION; - SIVAL(p,1,criterion); - SIVAL(p,5,timeup*1000); /* ms - despite the spec */ - p += 13; - strcpy(p,name); - strupper(p); - p = skip_string(p,1); - - send_mailslot_reply(False,BROWSE_MAILSLOT,ClientDGRAM, - outbuf,PTR_DIFF(p,outbuf), - name,group,0,0x1e,d->bcast_ip,*iface_ip(d->bcast_ip)); -} - - -/**************************************************************************** - un-register a SELF name that got rejected. - - if this name happens to be rejected when samba is in the process - of becoming a master browser (registering __MSBROWSE__, WORKGROUP(1d) - or WORKGROUP(1b)) then we must stop being a master browser. sad. - - **************************************************************************/ -void name_unregister_work(struct subnet_record *d, char *name, int name_type) -{ - struct work_record *work; - int remove_type_local = 0; - int remove_type_domain = 0; - int remove_type_logon = 0; - - remove_netbios_name(d,name,name_type,SELF,ipzero); - - if (!(work = find_workgroupstruct(d, name, False))) return; - - /* work out what to unbecome, from the name type being removed */ - - if (ms_browser_name(name, name_type)) - { - remove_type_local |= SV_TYPE_MASTER_BROWSER; - } - if (AM_MASTER(work) && strequal(name, myworkgroup) && name_type == 0x1d) - { - remove_type_local |= SV_TYPE_MASTER_BROWSER; - } - if (AM_DOMMST(work) && strequal(name, myworkgroup) && name_type == 0x1b) - { - remove_type_domain |= SV_TYPE_DOMAIN_MASTER; - } - if (AM_DOMMEM(work) && strequal(name, myworkgroup) && name_type == 0x1c) - { - remove_type_logon|= SV_TYPE_DOMAIN_MEMBER; - } - - if (remove_type_local ) unbecome_local_master (d, work, remove_type_local ); - if (remove_type_domain) unbecome_domain_master(d, work, remove_type_domain); - if (remove_type_logon ) unbecome_logon_server (d, work, remove_type_logon ); -} - - -/**************************************************************************** - registers a name. - - if the name being added is a SELF name, we must additionally check - whether to proceed to the next stage in samba becoming a master browser. - - **************************************************************************/ -void name_register_work(struct subnet_record *d, char *name, int name_type, - int nb_flags, time_t ttl, struct in_addr ip, BOOL bcast) -{ - enum name_source source = (ismyip(ip) || ip_equal(ip, ipzero)) ? - SELF : REGISTER; - - if (source == SELF) - { - struct work_record *work = find_workgroupstruct(d, - myworkgroup, False); - - add_netbios_entry(d,name,name_type,nb_flags,ttl,source,ip,True,!bcast); - - if (work) - { - int add_type_local = False; - int add_type_domain = False; - int add_type_logon = False; - - DEBUG(4,("checking next stage: name_register_work %s\n", name)); - - /* work out what to become, from the name type being added */ - - if (ms_browser_name(name, name_type)) - { - add_type_local = True; - } - if (strequal(name, myworkgroup) && name_type == 0x1d) - { - add_type_local = True; - } - if (strequal(name, myworkgroup) && name_type == 0x1b) - { - add_type_domain = True; - } - if (strequal(name, myworkgroup) && name_type == 0x1c) - { - add_type_logon = True; - } - - if (add_type_local ) become_local_master (d, work); - if (add_type_domain) become_domain_master(d, work); - if (add_type_logon ) become_logon_server (d, work); - } - } -} - - -/******************************************************************* - become the local master browser. - - this is done in stages. note that this could take a while, - particularly on a broadcast subnet, as we have to wait for - the implicit registration of each name to be accepted. - - as each name is successfully registered, become_local_master() is - called again, in order to initiate the next stage. see - dead_netbios_entry() - deals with implicit name registration - and response_name_reg() - deals with explicit registration - with a WINS server. - - stage 1: was MST_POTENTIAL - go to MST_POTENTIAL and register ^1^2__MSBROWSE__^2^1. - stage 2: was MST_BACK - go to MST_MSB and register WORKGROUP(0x1d) - stage 3: was MST_MSB - go to MST_BROWSER and stay there - - XXXX note: this code still does not cope with the distinction - between different types of nodes, particularly between M and P - nodes. that comes later. - - ******************************************************************/ -void become_local_master(struct subnet_record *d, struct work_record *work) -{ - /* domain type must be limited to domain enum + server type. it must - not have SV_TYPE_SERVER or anything else with SERVER in it, else - clients get confused and start thinking this entry is a server - not a workgroup - */ - uint32 domain_type = SV_TYPE_DOMAIN_ENUM|SV_TYPE_NT; - - if (!work || !d) - return; - - if (!lp_local_master()) - { - DEBUG(0,("Samba not configured as a local master browser.\n")); - return; - } - - DEBUG(2,("Becoming master for %s %s (currently at stage %d)\n", - work->work_group,inet_ntoa(d->bcast_ip),work->mst_state)); - - switch (work->mst_state) - { - case MST_POTENTIAL: /* while we were nothing but a server... */ - { - DEBUG(3,("go to first stage: register ^1^2__MSBROWSE__^2^1\n")); - work->mst_state = MST_BACK; /* an election win was successful */ - - work->ElectionCriterion |= 0x5; - - /* update our server status */ - work->ServerType &= ~SV_TYPE_POTENTIAL_BROWSER; - add_server_entry(d,work,myname,work->ServerType|SV_TYPE_LOCAL_LIST_ONLY, - 0,lp_serverstring(),True); - - /* add special browser name */ - add_my_name_entry(d,MSBROWSE,0x01,nb_type|NB_ACTIVE|NB_GROUP,False); - - /* DON'T do anything else after calling add_my_name_entry() */ - break; - } - - case MST_BACK: /* while nothing had happened except we won an election... */ - { - DEBUG(3,("go to second stage: register as master browser\n")); - work->mst_state = MST_MSB; /* registering MSBROWSE was successful */ - - /* add server entry on successful registration of MSBROWSE */ - add_server_entry(d,work,work->work_group,domain_type|SV_TYPE_LOCAL_LIST_ONLY, - 0,myname,True); - - /* add master name */ - add_my_name_entry(d,work->work_group,0x1d,nb_type|NB_ACTIVE,False); - - /* DON'T do anything else after calling add_my_name_entry() */ - break; - } - - case MST_MSB: /* while we were still only registered MSBROWSE state... */ - { - int i = 0; - struct server_record *sl; - - DEBUG(3,("2nd stage complete: registered as master browser for workgroup %s \ -on subnet %s\n", work->work_group, inet_ntoa(d->bcast_ip))); - work->mst_state = MST_BROWSER; /* registering WORKGROUP(1d) succeeded */ - - /* update our server status */ - work->ServerType |= SV_TYPE_MASTER_BROWSER; - - DEBUG(3,("become_local_master: updating our server %s to type %x\n", - myname, work->ServerType)); - - add_server_entry(d,work,myname,work->ServerType|SV_TYPE_LOCAL_LIST_ONLY, - 0,lp_serverstring(),True); - - /* 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 */ - announce_request(work, d->bcast_ip); - } - - /* Reset the announce master timer so that we do an announce as soon as possible - now we are a master. */ - reset_announce_timer(); - - DEBUG(0,("Samba is now a local master browser for workgroup %s on subnet %s\n", - work->work_group, inet_ntoa(d->bcast_ip))); - - break; - } - - case MST_BROWSER: - { - /* don't have to do anything: just report success */ - DEBUG(3,("3rd stage: become master browser!\n")); - break; - } - } -} - - -/******************************************************************* - become the domain master browser. - - this is done in stages. note that this could take a while, - particularly on a broadcast subnet, as we have to wait for - the implicit registration of each name to be accepted. - - as each name is successfully registered, become_domain_master() is - called again, in order to initiate the next stage. see - dead_netbios_entry() - deals with implicit name registration - and response_name_reg() - deals with explicit registration - with a WINS server. - - stage 1: was DOMAIN_NONE - go to DOMAIN_MST - - XXXX note: this code still does not cope with the distinction - between different types of nodes, particularly between M and P - nodes. that comes later. - - ******************************************************************/ -void become_domain_master(struct subnet_record *d, struct work_record *work) -{ - /* domain type must be limited to domain enum + server type. it must - not have SV_TYPE_SERVER or anything else with SERVER in it, else - clients get confused and start thinking this entry is a server - not a workgroup - */ - - if (!work || !d) return; - - if (!lp_domain_master()) - { - DEBUG(0,("Samba not configured as a domain master browser.\n")); - return; - } - - DEBUG(2,("Becoming domain master for %s %s (currently at stage %d)\n", - work->work_group,inet_ntoa(d->bcast_ip),work->dom_state)); - - switch (work->dom_state) - { - case DOMAIN_NONE: /* while we were nothing but a server... */ - { - DEBUG(3,("become_domain_master: go to first stage: register <1b> name\n")); - work->dom_state = DOMAIN_WAIT; - - /* Registering the DOMAIN<1b> name is very tricky. We need to - do this on all our subnets, but don't want to bradcast it - on locally connected subnets (WinNT doesn't do this). Also, - previous versions of Samba screw up royally when we do this. - We need to register it immediatly on our local subnet, but - also actually check with the WINS server if it exists. If the name - has already been claimed by someone else in the WINS server - then we need to back out all our local registrations and - fail. Thus we only directly enter the name on local subnets, - on the WINS subnet we actually check... - */ - /* XXXX the 0x1b is domain master browser name */ - if(d == wins_subnet) - add_my_name_entry(d, work->work_group,0x1b,nb_type|NB_ACTIVE,False); - else - add_my_name_entry(d, work->work_group,0x1b,nb_type|NB_ACTIVE,True); - - /* DON'T do anything else after calling add_my_name_entry() */ - break; - } - - case DOMAIN_WAIT: - { - work->dom_state = DOMAIN_MST; /* ... become domain master */ - DEBUG(3,("become_domain_master: first stage - register as domain member\n")); - - /* update our server status */ - work->ServerType |= SV_TYPE_NT|SV_TYPE_DOMAIN_MASTER; - add_server_entry(d,work,myname,work->ServerType|SV_TYPE_LOCAL_LIST_ONLY, - 0, lp_serverstring(),True); - - DEBUG(0,("Samba is now a domain master browser for workgroup %s on subnet %s\n", - work->work_group, inet_ntoa(d->bcast_ip))); - - break; - } - - case DOMAIN_MST: - { - /* don't have to do anything: just report success */ - DEBUG(3,("domain second stage: there isn't one!\n")); - break; - } - } -} - - -/******************************************************************* - become a logon server. - ******************************************************************/ -void become_logon_server(struct subnet_record *d, struct work_record *work) -{ - if (!work || !d) return; - - if (!lp_domain_logons()) - { - DEBUG(0,("samba not configured as a logon master.\n")); - return; - } - - DEBUG(2,("Becoming logon server for %s %s (currently at stage %d)\n", - work->work_group,inet_ntoa(d->bcast_ip),work->log_state)); - - switch (work->log_state) - { - case LOGON_NONE: /* while we were nothing but a server... */ - { - DEBUG(3,("go to first stage: register <1c> name\n")); - work->log_state = LOGON_WAIT; - - /* XXXX the 0x1c is apparently something to do with domain logons */ - add_my_name_entry(d, myworkgroup,0x1c,nb_type|NB_ACTIVE|NB_GROUP,False); - - /* DON'T do anything else after calling add_my_name_entry() */ - break; - } - - case LOGON_WAIT: - { - work->log_state = LOGON_SRV; /* ... become logon server */ - DEBUG(3,("logon second stage: register \n")); - - /* update our server status */ - work->ServerType |= SV_TYPE_NT|SV_TYPE_DOMAIN_MEMBER; - add_server_entry(d,work,myname,work->ServerType|SV_TYPE_LOCAL_LIST_ONLY - ,0, lp_serverstring(),True); - - /* DON'T do anything else after calling add_my_name_entry() */ - break; - } - - case LOGON_SRV: - { - DEBUG(3,("logon third stage: there isn't one!\n")); - break; - } - } -} - - -/******************************************************************* - unbecome the local master browser. initates removal of necessary netbios - names, and tells the world that we are no longer a master browser. - - XXXX this _should_ be used to demote to a backup master browser, without - going straight to non-master browser. another time. - - ******************************************************************/ -void unbecome_local_master(struct subnet_record *d, struct work_record *work, - int remove_type) -{ - int new_server_type = work->ServerType; - - /* can only remove master types with this function */ - remove_type &= SV_TYPE_MASTER_BROWSER; - - new_server_type &= ~remove_type; - - if (remove_type) - { - DEBUG(2,("Becoming local non-master for %s\n",work->work_group)); - - /* no longer a master browser of any sort */ - - work->ServerType |= SV_TYPE_POTENTIAL_BROWSER; - work->ElectionCriterion &= ~0x4; - work->mst_state = MST_POTENTIAL; - - /* announce ourselves as no longer active as a master browser. */ - announce_server(d, work, work->work_group, myname, 0, 0); - remove_name_entry(d,MSBROWSE ,0x01,False); - remove_name_entry(d,work->work_group,0x1d,False); - } -} - - -/******************************************************************* - unbecome the domain master browser. initates removal of necessary netbios - names, and tells the world that we are no longer a domain browser. - ******************************************************************/ -void unbecome_domain_master(struct subnet_record *d, struct work_record *work, - int remove_type) -{ - int new_server_type = work->ServerType; - - DEBUG(2,("Becoming domain non-master for %s\n",work->work_group)); - - /* can only remove master or domain types with this function */ - remove_type &= SV_TYPE_DOMAIN_MASTER; - - new_server_type &= ~remove_type; - - if (remove_type) - { - /* no longer a domain master browser of any sort */ - - work->dom_state = DOMAIN_NONE; - - /* announce ourselves as no longer active as a master browser on - all our local subnets. */ - for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_EXCLUDING_WINS(d)) - { - work = find_workgroupstruct(d, myworkgroup, False); - - announce_server(d, work, work->work_group, myname, 0, 0); - /* Remove the name entry without any NetBIOS traffic as that's - how it was registered. */ - remove_name_entry(d,work->work_group,0x1b,True); - } - } -} - - -/******************************************************************* - unbecome the logon server. initates removal of necessary netbios - names, and tells the world that we are no longer a logon server. - ******************************************************************/ -void unbecome_logon_server(struct subnet_record *d, struct work_record *work, - int remove_type) -{ - int new_server_type = work->ServerType; - - DEBUG(2,("Becoming logon non-server for %s\n",work->work_group)); - - /* can only remove master or domain types with this function */ - remove_type &= SV_TYPE_DOMAIN_MEMBER; - - new_server_type &= ~remove_type; - - if (remove_type) - { - /* no longer a master browser of any sort */ - - work->log_state = LOGON_NONE; - - /* announce ourselves as no longer active as a master browser. */ - announce_server(d, work, work->work_group, myname, 0, 0); - remove_name_entry(d,work->work_group,0x1c,False); - } -} - - -/******************************************************************* - run the election - ******************************************************************/ -void run_elections(time_t t) -{ - static time_t lastime = 0; - - struct subnet_record *d; - - /* send election packets once a second */ - if (lastime && t-lastime <= 0) return; - - lastime = t; - - for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_EXCLUDING_WINS(d)) - { - struct work_record *work; - - for (work = d->workgrouplist; work; work = work->next) - { - if (work->RunningElection) - { - send_election(d,work->work_group, work->ElectionCriterion, - t-StartupTime,myname); - - if (work->ElectionCount++ >= 4) - { - /* I won! now what :-) */ - DEBUG(2,(">>> Won election on %s %s <<<\n", - work->work_group,inet_ntoa(d->bcast_ip))); - - work->RunningElection = False; - work->mst_state = MST_POTENTIAL; - - become_local_master(d, work); - } - } - } - } -} - - -/******************************************************************* - work out if I win an election - ******************************************************************/ -static BOOL win_election(struct work_record *work,int version,uint32 criterion, - int timeup,char *name) -{ - int mytimeup = time(NULL) - StartupTime; - uint32 mycriterion = work->ElectionCriterion; - - /* If local master is false then never win - in election broadcasts. */ - if(!lp_local_master()) - { - DEBUG(3,("win_election: Losing election as local master == False\n")); - return False; - } - - DEBUG(4,("election comparison: %x:%x %x:%x %d:%d %s:%s\n", - version,ELECTION_VERSION, - criterion,mycriterion, - timeup,mytimeup, - name,myname)); - - if (version > ELECTION_VERSION) return(False); - if (version < ELECTION_VERSION) return(True); - - if (criterion > mycriterion) return(False); - if (criterion < mycriterion) return(True); - - if (timeup > mytimeup) return(False); - if (timeup < mytimeup) return(True); - - if (strcasecmp(myname,name) > 0) return(False); - - return(True); -} - - -/******************************************************************* - process a election packet - - An election dynamically decides who will be the master. - ******************************************************************/ -void process_election(struct packet_struct *p,char *buf) -{ - struct dgram_packet *dgram = &p->packet.dgram; - struct in_addr ip = dgram->header.source_ip; - struct subnet_record *d = find_subnet(ip); - int version = CVAL(buf,0); - uint32 criterion = IVAL(buf,1); - int timeup = IVAL(buf,5)/1000; - char *name = buf+13; - struct work_record *work; - - if (!d) return; - - if (ip_equal(d->bcast_ip,wins_ip)) - { - DEBUG(3,("Unexpected election request from %s %s on WINS net\n", - name, inet_ntoa(p->ip))); - return; - } - - name[15] = 0; - - DEBUG(3,("Election request from %s %s vers=%d criterion=%08x timeup=%d\n", - name,inet_ntoa(p->ip),version,criterion,timeup)); - - if (same_context(dgram)) return; - - for (work = d->workgrouplist; work; work = work->next) - { - if (!strequal(work->work_group, myworkgroup)) - continue; - - if (win_election(work, version,criterion,timeup,name)) - { - if (!work->RunningElection) - { - work->needelection = True; - work->ElectionCount=0; - work->mst_state = MST_POTENTIAL; - } - } - else - { - work->needelection = False; - - if (work->RunningElection || AM_MASTER(work)) - { - work->RunningElection = False; - DEBUG(3,(">>> Lost election on %s %s <<<\n", - work->work_group,inet_ntoa(d->bcast_ip))); - if (AM_MASTER(work)) - { - unbecome_local_master(d, work, SV_TYPE_MASTER_BROWSER); - } - } - } - } -} - - -/**************************************************************************** - checks whether a browser election is to be run on any workgroup - - this function really ought to return the time between election - packets (which depends on whether samba intends to be a domain - master or a master browser) in milliseconds. - - ***************************************************************************/ -BOOL check_elections(void) -{ - struct subnet_record *d; - BOOL run_any_election = False; - - for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_EXCLUDING_WINS(d)) - { - struct work_record *work; - for (work = d->workgrouplist; work; work = work->next) - { - run_any_election |= work->RunningElection; - - if (work->needelection && !work->RunningElection) - { - DEBUG(3,(">>> Starting election on %s %s <<<\n", - work->work_group,inet_ntoa(d->bcast_ip))); - work->ElectionCount = 0; - work->RunningElection = True; - work->needelection = False; - } - } - } - return run_any_election; -} - |