Unix SMB/Netbios implementation.
Version 1.9.
NBT netbios routines and daemon - version 2
- Copyright (C) Andrew Tridgell 1994-1996
+ 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
extern pstring scope;
extern pstring myname;
+extern fstring myworkgroup;
extern struct in_addr ipzero;
-extern struct in_addr ipgrp;
+extern struct in_addr wins_ip;
/* here are my election parameters */
******************************************************************/
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;
+ static time_t lastrun=0;
+ struct subnet_record *d;
- lastrun = t;
+ if (!lastrun) lastrun = t;
+ if (t < lastrun + CHECK_TIME_MST_BROWSE * 60) return;
- dump_workgroups();
+ lastrun = t;
- for (d = subnetlist; d; d = d->next)
- {
- struct work_record *work;
+ dump_workgroups();
- for (work = d->workgrouplist; work; work = work->next)
- {
- if (!AM_MASTER(work))
- {
- if (lp_preferred_master())
- {
- /* preferred master - not a master browser. force
- becoming a master browser, hence the log message.
- */
-
- DEBUG(0,("%s preferred master for %s %s - force election\n",
- timestring(), work->work_group,
- inet_ntoa(d->bcast_ip)));
+ for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_EXCLUDING_WINS(d))
+ {
+ struct work_record *work;
- 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);
- }
- }
- }
- }
+ for (work = d->workgrouplist; work; work = work->next)
+ {
+ if (strequal(work->work_group, myworkgroup) && !AM_MASTER(work))
+ {
+ if (lp_local_master() && lp_preferred_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
+ 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)
{
if (!work || !d) return;
/* don't do election stuff on the WINS subnet */
- if (ip_equal(d->bcast_ip,ipgrp))
+ if (ip_equal(d->bcast_ip,wins_ip))
return;
- if (strequal(work->work_group, lp_workgroup()))
+ 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
- {
- /* 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);
+ }
+ 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);
+ }
}
}
{
remove_type_local |= SV_TYPE_MASTER_BROWSER;
}
- if (AM_MASTER(work) && strequal(name, lp_workgroup()) == 0 &&
- name_type == 0x1d)
+ if (AM_MASTER(work) && strequal(name, myworkgroup) && name_type == 0x1d)
{
remove_type_local |= SV_TYPE_MASTER_BROWSER;
}
- if (AM_DOMMST(work) && strequal(name, lp_workgroup()) == 0 &&
- name_type == 0x1b)
+ if (AM_DOMMST(work) && strequal(name, myworkgroup) && name_type == 0x1b)
{
remove_type_domain |= SV_TYPE_DOMAIN_MASTER;
}
- if (AM_DOMMEM(work) && strequal(name, lp_workgroup()) == 0 &&
- name_type == 0x1c)
+ if (AM_DOMMEM(work) && strequal(name, myworkgroup) && name_type == 0x1c)
{
remove_type_logon|= SV_TYPE_DOMAIN_MEMBER;
}
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)) ?
+ enum name_source source = (ismyip(ip) || ip_equal(ip, ipzero)) ?
SELF : REGISTER;
- if (source == SELF)
- {
- struct work_record *work = find_workgroupstruct(d, lp_workgroup(), 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;
+ if (source == SELF)
+ {
+ struct work_record *work = find_workgroupstruct(d,
+ myworkgroup, False);
- /* work out what to become, from the name type being added */
+ add_netbios_entry(d,name,name_type,nb_flags,ttl,source,ip,True,!bcast);
- if (ms_browser_name(name, name_type))
- {
- add_type_local = True;
- }
- if (strequal(name, lp_workgroup()) == 0 && name_type == 0x1d)
- {
- add_type_local = True;
- }
- if (strequal(name, lp_workgroup()) == 0 && name_type == 0x1b)
- {
- add_type_domain = True;
- }
- if (strequal(name, lp_workgroup()) == 0 && 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);
- }
- }
+ 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);
+ }
+ }
}
*/
uint32 domain_type = SV_TYPE_DOMAIN_ENUM|SV_TYPE_NT;
- if (!work || !d) return;
+ 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));
+ 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->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,0,lp_serverstring(),True);
+ 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);
+ add_my_name_entry(d,MSBROWSE,0x01,nb_type|NB_ACTIVE|NB_GROUP);
/* 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 */
+ 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,0,myname,True);
+ 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);
case MST_MSB: /* while we were still only registered MSBROWSE state... */
{
- DEBUG(3,("2nd stage complete: registered as master browser\n"));
- work->mst_state = MST_BROWSER; /* ... registering WORKGROUP(1d) succeeded */
+ 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;
- add_server_entry(d,work,myname,work->ServerType,0,lp_serverstring(),True);
- if (work->serverlist == NULL) /* no servers! */
+ 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 */
- /* XXXX OOPS! add_server_entry will always add one entry - our own. */
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;
}
{
/* don't have to do anything: just report success */
DEBUG(3,("3rd stage: become master browser!\n"));
-
break;
}
}
******************************************************************/
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
- */
+ /* 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;
+ }
- if (!work || !d) 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... */
- {
- if (lp_domain_master())
- {
- DEBUG(3,("go to first stage: register <1b> name\n"));
- work->dom_state = DOMAIN_WAIT;
+ DEBUG(2,("Becoming domain master for %s %s (currently at stage %d)\n",
+ work->work_group,inet_ntoa(d->bcast_ip),work->dom_state));
- /* XXXX the 0x1b is domain master browser name */
- add_my_name_entry(d, lp_workgroup(),0x1b,nb_type|NB_ACTIVE|NB_GROUP);
+ 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;
- /* DON'T do anything else after calling add_my_name_entry() */
- break;
- }
- else
- {
- DEBUG(4,("samba not configured as a domain master.\n"));
- }
-
- break;
- }
+ /* XXXX the 0x1b is domain master browser name */
+ add_my_name_entry(d, work->work_group,0x1b,nb_type|NB_ACTIVE);
- case DOMAIN_WAIT:
- {
- if (lp_domain_master())
- {
- work->dom_state = DOMAIN_MST; /* ... become domain master */
- DEBUG(3,("domain 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,0,
- lp_serverstring(),True);
+ /* DON'T do anything else after calling add_my_name_entry() */
+ break;
+ }
- DEBUG(4,("samba is now a domain master\n"));
+ case DOMAIN_WAIT:
+ {
+ work->dom_state = DOMAIN_MST; /* ... become domain master */
+ DEBUG(3,("become_domain_master: first stage - register as domain member\n"));
- break;
- }
- else
- {
- DEBUG(4,("samba not configured as a domain master.\n"));
- }
-
- break;
- }
+ /* 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);
- case DOMAIN_MST:
- {
- /* don't have to do anything: just report success */
- DEBUG(3,("domain second stage: there isn't one!\n"));
- break;
- }
- }
+ DEBUG(0,("Samba is now a domain master browser for workgroup %s on subnet %s\n",
+ work->work_group, inet_ntoa(d->bcast_ip)));
+
+ if (d == wins_subnet)
+ {
+ /* ok! we successfully registered by unicast with the
+ WINS server. we now expect to become the domain
+ master on the local subnets. if this fails, it's
+ probably a 1.9.16p2 to 1.9.16p11 server's fault.
+
+ this is a configuration issue that should be addressed
+ by the network administrator - you shouldn't have
+ several machines configured as a domain master browser
+ for the same WINS scope (except if they are 1.9.17 or
+ greater, and you know what you're doing.
+
+ see DOMAIN.txt.
+
+ */
+ add_domain_master_bcast();
+ }
+ break;
+ }
+
+ case DOMAIN_MST:
+ {
+ /* don't have to do anything: just report success */
+ DEBUG(3,("domain second stage: there isn't one!\n"));
+ break;
+ }
+ }
}
{
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));
+ 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... */
{
- if (lp_domain_logons())
- {
- DEBUG(3,("go to first stage: register <1c> name\n"));
- work->log_state = LOGON_WAIT;
+ 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, lp_workgroup(),0x1c,nb_type|NB_ACTIVE|NB_GROUP);
+ /* XXXX the 0x1c is apparently something to do with domain logons */
+ add_my_name_entry(d, myworkgroup,0x1c,nb_type|NB_ACTIVE|NB_GROUP);
- /* DON'T do anything else after calling add_my_name_entry() */
- break;
- }
- {
- DEBUG(4,("samba not configured as a logon master.\n"));
- }
-
+ /* DON'T do anything else after calling add_my_name_entry() */
break;
}
- case LOGON_WAIT:
- {
- if (lp_domain_logons())
- {
- work->log_state = LOGON_SRV; /* ... become logon server */
- DEBUG(3,("logon second stage: register \n"));
+ 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,0,
- lp_serverstring(),True);
+ /* 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;
- }
- else
- {
- DEBUG(4,("samba not configured as a logon server.\n"));
- }
-
+ /* DON'T do anything else after calling add_my_name_entry() */
break;
- }
+ }
- case LOGON_SRV:
- {
+ case LOGON_SRV:
+ {
DEBUG(3,("logon third stage: there isn't one!\n"));
break;
- }
-
+ }
}
}
work->dom_state = DOMAIN_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,0x1b);
+ /* 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);
+
+ /* Remove the name entry without any NetBIOS traffic as that's
+ how it was registered. */
+ remove_name_entry(d,work->work_group,0x1b);
+ }
+
+ /* Unregister the 1b name from the WINS server. */
+ if(wins_subnet != NULL)
+ remove_name_entry(wins_subnet, myworkgroup, 0x1b);
}
}
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);
}
}
lastime = t;
- for (d = subnetlist; d; d = d->next)
+ 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)
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,
******************************************************************/
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;
+ 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(0,("Unexpected election request from %s %s on WINS net\n",
+ name, inet_ntoa(p->ip)));
+ return;
+ }
- if (!d) return;
+ name[15] = 0;
- if (ip_equal(d->bcast_ip,ipgrp)) {
- 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));
- 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, lp_workgroup()))
- 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);
+ 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);
+ }
+ }
+ }
}
- }
- }
}
struct subnet_record *d;
BOOL run_any_election = False;
- for (d = subnetlist; d; d = d->next)
+ for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_EXCLUDING_WINS(d))
{
struct work_record *work;
for (work = d->workgrouplist; work; work = work->next)