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-rw-r--r--source/nameserv.c2318
1 files changed, 2318 insertions, 0 deletions
diff --git a/source/nameserv.c b/source/nameserv.c
new file mode 100644
index 00000000000..802b98ec0a0
--- /dev/null
+++ b/source/nameserv.c
@@ -0,0 +1,2318 @@
+/*
+ Unix SMB/Netbios implementation.
+ Version 1.9.
+ NBT netbios routines and daemon - version 2
+ Copyright (C) Andrew Tridgell 1994-1995
+
+ 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 "loadparm.h"
+#include "nameserv.h"
+
+
+static void queue_packet(struct packet_struct *packet);
+void process(void);
+static void dump_names(void);
+static void announce_request(char *group);
+void sync_browse_lists(char *name,int name_type,char *myname,
+ char *domain,struct in_addr ip);
+
+extern int DEBUGLEVEL;
+
+extern pstring debugf;
+pstring servicesf = CONFIGFILE;
+
+extern pstring scope;
+
+extern BOOL CanRecurse;
+
+extern struct in_addr myip;
+extern struct in_addr bcast_ip;
+extern struct in_addr Netmask;
+extern pstring myhostname;
+static pstring host_file;
+static pstring myname="";
+
+static int ClientNMB= -1;
+static int ClientDGRAM= -1;
+
+static BOOL needannounce=True;
+
+/* this is our name database */
+static struct name_record *namelist = NULL;
+
+/* list of servers to be returned by NetServerEnum */
+static struct server_record *serverlist = NULL;
+
+/* this is the domain list. For the moment we will assume that our
+ primary domain is the first one listed in this list */
+static struct domain_record *domainlist = NULL;
+
+/* are we running as a daemon ? */
+static BOOL is_daemon = False;
+
+/* machine comment for host announcements */
+static pstring ServerComment="";
+
+static BOOL got_bcast = False;
+static BOOL got_myip = False;
+static BOOL got_nmask = False;
+
+static BOOL updatedlists = False;
+static int updatecount=0;
+
+/* what server type are we currently */
+static int ServerType =
+SV_TYPE_WORKSTATION | SV_TYPE_SERVER | SV_TYPE_TIME_SOURCE |
+SV_TYPE_SERVER_UNIX |
+SV_TYPE_PRINTQ_SERVER | SV_TYPE_POTENTIAL_BROWSER;
+
+/* here are my election parameters */
+
+/* NTAS uses 2, NT uses 1, WfWg uses 0 */
+#define MAINTAIN_LIST 1
+#define ELECTION_VERSION 1
+
+static BOOL RunningElection = False;
+static BOOL needelection = False;
+static int ElectionCount = 0;
+static int StartupTime =0;
+
+
+/* WfWg uses 01040b01 */
+/* Win95 uses 01041501 */
+/* NTAS uses ?? */
+static uint32 ElectionCriterion = (MAINTAIN_LIST<<1)|(ELECTION_VERSION<<8);
+
+/* we currently support being the master for just one group. Being the
+ master for more than one group might be tricky as NetServerEnum is
+ often asked for a list without naming the group */
+static fstring PrimaryGroup="";
+
+#define AM_MASTER (PrimaryGroup[0] && (ServerType & SV_TYPE_MASTER_BROWSER))
+
+#define MSBROWSE "\001\002__MSBROWSE__\002"
+
+#define GET_TTL(ttl) ((ttl)?MIN(ttl,lp_max_ttl()):lp_max_ttl())
+
+#define BROWSE_MAILSLOT "\\MAILSLOT\\BROWSE"
+
+/****************************************************************************
+catch a sighup
+****************************************************************************/
+static int sig_hup()
+{
+ BlockSignals(True);
+
+ DEBUG(0,("Got SIGHUP (reload not implemented)\n"));
+ dump_names();
+ reload_services(True);
+
+ BlockSignals(False);
+#ifndef DONT_REINSTALL_SIG
+ signal(SIGHUP,SIGNAL_CAST sig_hup);
+#endif
+ return(0);
+}
+
+/****************************************************************************
+catch a sigpipe
+****************************************************************************/
+static int sig_pipe()
+{
+ BlockSignals(True);
+
+ DEBUG(0,("Got SIGPIPE\n"));
+ if (!is_daemon)
+ exit(1);
+ BlockSignals(False);
+ return(0);
+}
+
+#if DUMP_CORE
+/*******************************************************************
+prepare to dump a core file - carefully!
+********************************************************************/
+static BOOL dump_core(void)
+{
+ char *p;
+ pstring dname;
+ strcpy(dname,debugf);
+ if ((p=strrchr(dname,'/'))) *p=0;
+ strcat(dname,"/corefiles");
+ mkdir(dname,0700);
+ sys_chown(dname,getuid(),getgid());
+ chmod(dname,0700);
+ if (chdir(dname)) return(False);
+ umask(~(0700));
+
+#ifndef NO_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",rlp.rlim_cur,rlp.rlim_max));
+ }
+#endif
+#endif
+
+
+ DEBUG(0,("Dumping core in %s\n",dname));
+ return(True);
+}
+#endif
+
+
+/****************************************************************************
+possibly continue after a fault
+****************************************************************************/
+static void fault_continue(void)
+{
+ static int errcount=1;
+
+ errcount--;
+
+ if (is_daemon && errcount)
+ process();
+
+#if DUMP_CORE
+ if (dump_core()) return;
+#endif
+
+ return;
+}
+
+
+/*******************************************************************
+ wrapper to get the DC
+ ******************************************************************/
+static char *domain_controller(void)
+{
+ char *dc = lp_domain_controller();
+ /* so many people mistake this for a bool that we need to handle it. sigh. */
+ if (!*dc || strequal(dc,"yes") || strequal(dc,"true"))
+ strcpy(dc,myname);
+ return(dc);
+}
+
+
+
+/****************************************************************************
+ true if two netbios names are equal
+****************************************************************************/
+static BOOL name_equal(struct nmb_name *n1,struct nmb_name *n2)
+{
+ if (n1->name_type != n2->name_type) return(False);
+
+ return(strequal(n1->name,n2->name) && strequal(n1->scope,n2->scope));
+}
+
+/****************************************************************************
+ add a netbios name into the namelist
+ **************************************************************************/
+static void add_name(struct name_record *n)
+{
+ struct name_record *n2;
+
+ if (!namelist) {
+ namelist = n;
+ n->prev = NULL;
+ n->next = NULL;
+ return;
+ }
+
+ for (n2 = namelist; n2->next; n2 = n2->next) ;
+
+ n2->next = n;
+ n->next = NULL;
+ n->prev = n2;
+}
+
+/****************************************************************************
+ add a domain into the list
+ **************************************************************************/
+static void add_domain(struct domain_record *d)
+{
+ struct domain_record *d2;
+
+ if (!domainlist) {
+ domainlist = d;
+ d->prev = NULL;
+ d->next = NULL;
+ return;
+ }
+
+ for (d2 = domainlist; d2->next; d2 = d2->next) ;
+
+ d2->next = d;
+ d->next = NULL;
+ d->prev = d2;
+}
+
+
+/****************************************************************************
+ add a server into the list
+ **************************************************************************/
+static void add_server(struct server_record *s)
+{
+ struct server_record *s2;
+
+ if (!serverlist) {
+ serverlist = s;
+ s->prev = NULL;
+ s->next = NULL;
+ return;
+ }
+
+ for (s2 = serverlist; s2->next; s2 = s2->next) ;
+
+ s2->next = s;
+ s->next = NULL;
+ s->prev = s2;
+}
+
+/****************************************************************************
+ remove a name from the namelist. The pointer must be an element just
+ retrieved
+ **************************************************************************/
+static void remove_name(struct name_record *n)
+{
+ struct name_record *nlist = namelist;
+ while (nlist && nlist != n) nlist = nlist->next;
+ if (nlist) {
+ if (nlist->next) nlist->next->prev = nlist->prev;
+ if (nlist->prev) nlist->prev->next = nlist->next;
+ free(nlist);
+ }
+}
+
+/****************************************************************************
+ find a name in the namelist
+ **************************************************************************/
+static struct name_record *find_name(struct nmb_name *n)
+{
+ struct name_record *ret;
+ for (ret = namelist; ret; ret = ret->next)
+ if (name_equal(&ret->name,n)) return(ret);
+
+ return(NULL);
+}
+
+/****************************************************************************
+ dump a copy of the name table
+ **************************************************************************/
+static void dump_names(void)
+{
+ time_t t = time(NULL);
+ struct name_record *n;
+ struct domain_record *d;
+
+ DEBUG(3,("Dump of local name table:\n"));
+
+ for (n = namelist; n; n = n->next) {
+ DEBUG(3,("%s %s TTL=%d Unique=%s\n",
+ namestr(&n->name),
+ inet_ntoa(n->ip),
+ n->death_time?n->death_time-t:0,
+ BOOLSTR(n->unique)));
+ }
+
+ DEBUG(3,("\nDump of domain list:\n"));
+ for (d = domainlist; d; d = d->next)
+ DEBUG(3,("%s %s\n",d->name,inet_ntoa(d->bcast_ip)));
+}
+
+
+/****************************************************************************
+ add a host entry to the name list
+ ****************************************************************************/
+static struct name_record *add_host_entry(char *name,int type,BOOL unique,int ttl,
+ enum name_source source,
+ struct in_addr ip)
+{
+ struct name_record *n;
+ struct name_record *n2=NULL;
+
+ n = (struct name_record *)malloc(sizeof(*n));
+ if (!n) return(NULL);
+
+ bzero((char *)n,sizeof(*n));
+
+ make_nmb_name(&n->name,name,type,scope);
+ if ((n2=find_name(&n->name))) {
+ free(n);
+ n = n2;
+ }
+
+ if (ttl) n->death_time = time(NULL)+ttl*3;
+ n->ip = ip;
+ n->unique = unique;
+ n->source = source;
+
+ if (!n2) add_name(n);
+
+ DEBUG(3,("Added host entry %s at %s ttl=%d unique=%s\n",
+ namestr(&n->name),inet_ntoa(ip),ttl,BOOLSTR(unique)));
+
+ return(n);
+}
+
+
+/****************************************************************************
+ add a domain entry
+ ****************************************************************************/
+static struct domain_record *add_domain_entry(char *name,struct in_addr ip)
+{
+ struct domain_record *d;
+
+ d = (struct domain_record *)malloc(sizeof(*d));
+
+ if (!d) return(NULL);
+
+ bzero((char *)d,sizeof(*d));
+
+ if (zero_ip(ip)) ip = bcast_ip;
+
+ StrnCpy(d->name,name,sizeof(d->name)-1);
+ d->bcast_ip = ip;
+
+ if (!PrimaryGroup[0] && ip_equal(bcast_ip,ip) && name[0] != '*') {
+ strcpy(PrimaryGroup,name);
+ strupper(PrimaryGroup);
+ DEBUG(3,("Setting primary group to %s (%s)\n",PrimaryGroup,inet_ntoa(ip)));
+ }
+
+ add_domain(d);
+
+ ip = *interpret_addr2("255.255.255.255");
+ if (name[0] != '*') add_host_entry(name,0x1e,False,0,SELF,ip);
+
+ DEBUG(3,("Added domain entry %s at %s\n",
+ name,inet_ntoa(ip)));
+
+ return(d);
+}
+
+/****************************************************************************
+ add a server entry
+ ****************************************************************************/
+struct server_record *add_server_entry(char *name,int servertype,
+ int ttl,char *comment,BOOL replace)
+{
+ BOOL newentry=False;
+ struct server_record *s;
+
+ for (s = serverlist; s; s = s->next)
+ if (strequal(name,s->name)) break;
+
+ if (s && !replace) {
+ DEBUG(4,("Not replacing %s\n",name));
+ return(s);
+ }
+
+ updatedlists=True;
+
+ if (!s) {
+ newentry = True;
+ s = (struct server_record *)malloc(sizeof(*s));
+
+ if (!s) return(NULL);
+
+ bzero((char *)s,sizeof(*s));
+ }
+
+ /* update the entry */
+ StrnCpy(s->name,name,sizeof(s->name)-1);
+ StrnCpy(s->comment,comment,sizeof(s->comment)-1);
+ s->servertype = servertype;
+ s->death_time = ttl?time(NULL)+ttl*3:0;
+ strupper(s->name);
+ if (s->servertype & SV_TYPE_DOMAIN_ENUM) strupper(s->comment);
+
+ if (!newentry) return(s);
+
+ add_server(s);
+
+ if (newentry) {
+ DEBUG(3,("Added server entry %s of type %x (%s)\n",
+ name,servertype,comment));
+ } else {
+ DEBUG(3,("Updated server entry %s of type %x (%s)\n",
+ name,servertype,comment));
+ }
+
+ return(s);
+}
+
+
+/****************************************************************************
+ add the magic samba names, useful for finding samba servers
+ **************************************************************************/
+static void add_my_names(void)
+{
+ struct in_addr ip;
+
+ ip = *interpret_addr2("0.0.0.0");
+
+ add_host_entry(myname,0x20,True,0,SELF,ip);
+ add_host_entry(myname,0x0,True,0,SELF,ip);
+ add_host_entry(myname,0x1f,True,0,SELF,ip); /* used for chat?? */
+ add_host_entry(myname,0x3,True,0,SELF,ip); /* used for winpopup */
+
+ if (!domainlist)
+ add_domain_entry(lp_workgroup(),bcast_ip);
+ add_server_entry(myname,
+ ServerType,
+ 0,ServerComment,True);
+
+ add_host_entry("__SAMBA__",0x20,True,0,SELF,ip);
+ add_host_entry("__SAMBA__",0x0,True,0,SELF,ip);
+
+ if (lp_preferred_master()) {
+ DEBUG(3,("Preferred master startup\n"));
+ needelection = True;
+ ElectionCriterion |= (1<<3);
+ }
+
+ ElectionCriterion |= (lp_os_level() << 24);
+}
+
+
+/*******************************************************************
+ write out browse.dat
+ ******************************************************************/
+static void write_browse_list(void)
+{
+ struct server_record *s;
+ pstring fname,fnamenew;
+ FILE *f;
+
+ updatecount++;
+
+ strcpy(fname,lp_lockdir());
+ trim_string(fname,NULL,"/");
+ strcat(fname,"/");
+ strcat(fname,SERVER_LIST);
+ strcpy(fnamenew,fname);
+ strcat(fnamenew,".");
+
+ f = fopen(fnamenew,"w");
+
+ if (!f) {
+ DEBUG(4,("Can't open %s - %s\n",fnamenew,strerror(errno)));
+ return;
+ }
+
+ for (s=serverlist; s ; s = s->next) {
+ /* don't list domains I don't have a master for */
+ if ((s->servertype & SV_TYPE_DOMAIN_ENUM) && !s->comment[0]) continue;
+
+ fprintf(f,"\"%s\"\t%08x\t\"%s\"\n",s->name,s->servertype,s->comment);
+ }
+
+
+ fclose(f);
+ chmod(fnamenew,0644);
+ /* unlink(fname); */
+ rename(fnamenew,fname);
+ DEBUG(3,("Wrote browse list %s\n",fname));
+}
+
+/*******************************************************************
+ expire old names in the namelist and serverlist
+ ******************************************************************/
+static void expire_names(void)
+{
+ static time_t lastrun=0;
+ time_t t = time(NULL);
+ struct name_record *n;
+ struct name_record *next;
+ struct server_record *s;
+ struct server_record *nexts;
+
+ if (!lastrun) lastrun = t;
+ if (t < lastrun + 5) return;
+ lastrun = t;
+
+ /* expire old names */
+ for (n = namelist; n; n = next) {
+ if (n->death_time && n->death_time < t) {
+ DEBUG(3,("Removing dead name %s\n",
+ namestr(&n->name)));
+ next = n->next;
+ if (n->prev) n->prev->next = n->next;
+ if (n->next) n->next->prev = n->prev;
+ if (namelist == n) namelist = n->next;
+ free(n);
+ } else {
+ next = n->next;
+ }
+ }
+
+ /* expire old entries in the serverlist */
+ for (s = serverlist; s; s = nexts) {
+ if (s->death_time && s->death_time < t) {
+ DEBUG(3,("Removing dead server %s\n",s->name));
+ updatedlists = True;
+ nexts = s->next;
+ if (s->prev) s->prev->next = s->next;
+ if (s->next) s->next->prev = s->prev;
+ if (serverlist == s) serverlist = s->next;
+ free(s);
+ } else {
+ nexts = s->next;
+ }
+ }
+}
+
+
+/*******************************************************************
+ delete old names from the namelist
+ ******************************************************************/
+static void housekeeping(void)
+{
+ time_t t = time(NULL);
+
+ expire_names();
+
+ /* write out the browse.dat database for smbd to get */
+ if (updatedlists) {
+ write_browse_list();
+ updatedlists = False;
+ }
+
+ {
+ /* occasionally check to see if the master browser is around */
+ static time_t lastrun=0;
+ if (!lastrun) lastrun = t;
+ if (t < lastrun + 5*60) return;
+ lastrun = t;
+
+ if (!AM_MASTER && PrimaryGroup[0] &&
+ !name_query(ClientNMB,PrimaryGroup,0x1d,True,False,
+ bcast_ip,NULL,queue_packet)) {
+ DEBUG(2,("Forcing election on %s\n",PrimaryGroup));
+ needelection = True;
+ }
+ }
+}
+
+
+/****************************************************************************
+ reload the services file
+ **************************************************************************/
+BOOL reload_services(BOOL test)
+{
+ BOOL ret;
+ extern fstring remote_machine;
+
+ strcpy(remote_machine,"nmbd");
+
+ if (lp_loaded())
+ {
+ pstring fname;
+ strcpy(fname,lp_configfile());
+ if (file_exist(fname,NULL) && !strcsequal(fname,servicesf))
+ {
+ strcpy(servicesf,fname);
+ test = False;
+ }
+ }
+
+ if (test && !lp_file_list_changed())
+ return(True);
+
+ ret = lp_load(servicesf,True);
+
+ /* perhaps the config filename is now set */
+ if (!test)
+ reload_services(True);
+
+ return(ret);
+}
+
+
+
+/****************************************************************************
+load a netbios hosts file
+****************************************************************************/
+static void load_hosts_file(char *fname)
+{
+ FILE *f = fopen(fname,"r");
+ pstring line;
+ if (!f) {
+ DEBUG(2,("Can't open lmhosts file %s\n",fname));
+ return;
+ }
+
+ while (!feof(f))
+ {
+ if (!fgets_slash(line,sizeof(pstring),f)) continue;
+
+ if (*line == '#') continue;
+
+ {
+ BOOL group=False;
+ string ip,name,flags,extra;
+ char *ptr;
+ int count = 0;
+ struct in_addr ipaddr;
+ enum name_source source = LMHOSTS;
+
+ *ip = *name = *flags = *extra = 0;
+
+ ptr = line;
+
+ if (next_token(&ptr,ip,NULL)) ++count;
+ if (next_token(&ptr,name,NULL)) ++count;
+ if (next_token(&ptr,flags,NULL)) ++count;
+ if (next_token(&ptr,extra,NULL)) ++count;
+
+ if (count <= 0) continue;
+
+ if (count > 0 && count < 2)
+ {
+ DEBUG(0,("Ill formed hosts line [%s]\n",line));
+ continue;
+ }
+
+ if (strchr(flags,'G') || strchr(flags,'S'))
+ group = True;
+
+ if (strchr(flags,'M') && !group) {
+ source = SELF;
+ strcpy(myname,name);
+ }
+
+ ipaddr = *interpret_addr2(ip);
+
+ if (group) {
+ add_domain_entry(name,ipaddr);
+ } else {
+ add_host_entry(name,0x20,True,0,source,ipaddr);
+ }
+ }
+ }
+
+ fclose(f);
+}
+
+/*******************************************************************
+ check if 2 IPs are on the same net
+ we will assume the local netmask, although this could be wrong XXXX
+ ******************************************************************/
+static BOOL same_net(struct in_addr ip1,struct in_addr ip2)
+{
+ unsigned long net1,net2,nmask;
+
+ nmask = ntohl(Netmask.s_addr);
+ net1 = ntohl(ip1.s_addr);
+ net2 = ntohl(ip2.s_addr);
+
+ return((net1 & nmask) == (net2 & nmask));
+}
+
+/****************************************************************************
+ send an election packet
+ **************************************************************************/
+static void send_election(char *group,uint32 criterion,int timeup,char *name)
+{
+ pstring outbuf;
+ char *p;
+
+ DEBUG(2,("Sending election to %s for workgroup %s\n",
+ inet_ntoa(bcast_ip),group));
+
+ bzero(outbuf,sizeof(outbuf));
+ p = outbuf;
+ CVAL(p,0) = 8; /* election */
+ p++;
+
+ CVAL(p,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(BROWSE_MAILSLOT,ClientDGRAM,outbuf,PTR_DIFF(p,outbuf),
+ name,group,0,0x1e,bcast_ip,myip);
+}
+
+
+/****************************************************************************
+ send a backup list response
+ **************************************************************************/
+static void send_backup_list(char *name,int token,struct nmb_name *to,
+ struct in_addr ip)
+{
+ pstring outbuf;
+ char *p;
+
+ DEBUG(2,("Sending backup list to %s for workgroup %s\n",
+ inet_ntoa(ip),PrimaryGroup));
+
+ bzero(outbuf,sizeof(outbuf));
+ p = outbuf;
+ CVAL(p,0) = 10; /* backup list response */
+ p++;
+
+ CVAL(p,0) = 1; /* count */
+ SIVAL(p,1,token);
+ p += 5;
+ strcpy(p,name);
+ strupper(p);
+ p = skip_string(p,1) + 1;
+
+ send_mailslot_reply(BROWSE_MAILSLOT,ClientDGRAM,outbuf,PTR_DIFF(p,outbuf),
+ myname,to->name,0,to->name_type,ip,myip);
+}
+
+
+/*******************************************************************
+ become the master browser
+ ******************************************************************/
+static void become_master(void)
+{
+ uint32 domain_type = SV_TYPE_DOMAIN_ENUM | SV_TYPE_SERVER_UNIX;
+ DEBUG(2,("Becoming master for %s\n",PrimaryGroup));
+
+ ServerType |= SV_TYPE_MASTER_BROWSER;
+ ServerType |= SV_TYPE_BACKUP_BROWSER;
+ ElectionCriterion |= 0x5;
+
+ add_host_entry(PrimaryGroup,0x1d,True,0,SELF,myip);
+ add_host_entry(PrimaryGroup,0x0,False,0,SELF,myip);
+ add_host_entry(MSBROWSE,1,False,0,SELF,myip);
+
+ if (lp_domain_master()) {
+ add_host_entry(myname,0x1b,True,0,SELF,myip);
+ add_host_entry(PrimaryGroup,0x1b,True,0,SELF,myip);
+ add_host_entry(PrimaryGroup,0x1c,False,0,SELF,myip);
+ ServerType |= SV_TYPE_DOMAIN_MASTER;
+ if (lp_domain_logons()) {
+ ServerType |= SV_TYPE_DOMAIN_CTRL;
+ ServerType |= SV_TYPE_DOMAIN_MEMBER;
+ domain_type |= SV_TYPE_DOMAIN_CTRL;
+ }
+ }
+
+ add_server_entry(PrimaryGroup,domain_type,0,myname,True);
+ add_server_entry(myname,ServerType,0,ServerComment,True);
+
+ announce_request(PrimaryGroup);
+
+ needannounce = True;
+}
+
+
+/*******************************************************************
+ unbecome the master browser
+ ******************************************************************/
+static void become_nonmaster(void)
+{
+ struct name_record *n;
+ struct nmb_name nn;
+
+ DEBUG(2,("Becoming non-master for %s\n",PrimaryGroup));
+
+ ServerType &= ~SV_TYPE_MASTER_BROWSER;
+ ServerType &= ~SV_TYPE_DOMAIN_CTRL;
+ ServerType &= ~SV_TYPE_DOMAIN_MASTER;
+
+ ElectionCriterion &= ~0x4;
+
+ make_nmb_name(&nn,PrimaryGroup,0x1d,scope);
+ n = find_name(&nn);
+ if (n && n->source == SELF) remove_name(n);
+
+ make_nmb_name(&nn,PrimaryGroup,0x1b,scope);
+ n = find_name(&nn);
+ if (n && n->source == SELF) remove_name(n);
+
+ make_nmb_name(&nn,MSBROWSE,1,scope);
+ n = find_name(&nn);
+ if (n && n->source == SELF) remove_name(n);
+}
+
+
+/*******************************************************************
+ run the election
+ ******************************************************************/
+static void run_election(void)
+{
+ time_t t = time(NULL);
+ static time_t lastime = 0;
+
+ if (!PrimaryGroup[0] || !RunningElection) return;
+
+ /* send election packets once a second */
+ if (lastime &&
+ t-lastime <= 0) return;
+
+ lastime = t;
+
+ send_election(PrimaryGroup,ElectionCriterion,t-StartupTime,myname);
+
+ if (ElectionCount++ < 4) return;
+
+ /* I won! now what :-) */
+ RunningElection = False;
+ DEBUG(2,(">>> Won election on %s <<<\n",PrimaryGroup));
+ become_master();
+}
+
+
+/****************************************************************************
+ construct a host announcement unicast
+ **************************************************************************/
+static void announce_host(struct domain_record *d,char *my_name,char *comment)
+{
+ time_t t = time(NULL);
+ pstring outbuf;
+ char *p;
+ char *namep;
+ char *stypep;
+ char *commentp;
+ uint32 stype = ServerType;
+
+ if (needannounce) {
+ /* drop back to a max 3 minute announce - this is to prevent a
+ single lost packet from stuffing things up for too long */
+ d->announce_interval = MIN(d->announce_interval,3*60);
+ d->lastannounce_time = t - (d->announce_interval+1);
+ }
+
+ /* announce every minute at first then progress to every 12 mins */
+ if (d->lastannounce_time &&
+ (t - d->lastannounce_time) < d->announce_interval)
+ return;
+
+ if (d->announce_interval < 12*60) d->announce_interval += 60;
+ d->lastannounce_time = t;
+
+ DEBUG(2,("Sending announcement to %s for workgroup %s\n",
+ inet_ntoa(d->bcast_ip),d->name));
+
+ if (!strequal(PrimaryGroup,d->name) ||
+ !ip_equal(bcast_ip,d->bcast_ip)) {
+ stype &= ~(SV_TYPE_POTENTIAL_BROWSER | SV_TYPE_MASTER_BROWSER |
+ SV_TYPE_DOMAIN_MASTER | SV_TYPE_BACKUP_BROWSER |
+ SV_TYPE_DOMAIN_CTRL | SV_TYPE_DOMAIN_MEMBER);
+ }
+
+ if (!*comment) comment = "NoComment";
+ if (!*my_name) my_name = "NoName";
+
+ if (strlen(comment) > 43) comment[43] = 0;
+
+ bzero(outbuf,sizeof(outbuf));
+ CVAL(outbuf,0) = 1; /* host announce */
+ p = outbuf+1;
+
+ CVAL(p,0) = updatecount;
+ SIVAL(p,1,d->announce_interval*1000); /* ms - despite the spec */
+ namep = p+5;
+ StrnCpy(p+5,my_name,16);
+ strupper(p+5);
+ CVAL(p,21) = 2; /* major version */
+ CVAL(p,22) = 2; /* minor version */
+ stypep = p+23;
+ SIVAL(p,23,stype);
+ SSVAL(p,27,0xaa55); /* browse signature */
+ SSVAL(p,29,1); /* browse version */
+ commentp = p+31;
+ strcpy(p+31,comment);
+ p += 31;
+ p = skip_string(p,1);
+
+ send_mailslot_reply(BROWSE_MAILSLOT,ClientDGRAM,outbuf,PTR_DIFF(p,outbuf),
+ my_name,d->name,0,0x1d,d->bcast_ip,myip);
+
+ /* if I'm the master then I also need to do a local master and
+ domain announcement */
+
+ if (AM_MASTER &&
+ strequal(d->name,PrimaryGroup) &&
+ ip_equal(bcast_ip,d->bcast_ip)) {
+
+ /* do master announcements as well */
+ SIVAL(stypep,0,ServerType);
+
+ CVAL(outbuf,0) = 15; /* local master announce */
+ send_mailslot_reply(BROWSE_MAILSLOT,ClientDGRAM,outbuf,PTR_DIFF(p,outbuf),
+ my_name,PrimaryGroup,0,0x1e,d->bcast_ip,myip);
+
+ CVAL(outbuf,0) = 12; /* domain announce */
+ StrnCpy(namep,PrimaryGroup,15);
+ strupper(namep);
+ StrnCpy(commentp,myname,15);
+ strupper(commentp);
+ SIVAL(stypep,0,(unsigned)0x80000000);
+ p = commentp + strlen(commentp) + 1;
+
+ send_mailslot_reply(BROWSE_MAILSLOT,ClientDGRAM,outbuf,PTR_DIFF(p,outbuf),
+ my_name,MSBROWSE,0,1,d->bcast_ip,myip);
+ }
+}
+
+
+/****************************************************************************
+ send a announce request to the local net
+ **************************************************************************/
+static void announce_request(char *group)
+{
+ pstring outbuf;
+ char *p;
+
+ DEBUG(2,("Sending announce request to %s for workgroup %s\n",
+ inet_ntoa(bcast_ip),group));
+
+ bzero(outbuf,sizeof(outbuf));
+ p = outbuf;
+ CVAL(p,0) = 2; /* announce request */
+ p++;
+
+ CVAL(p,0) = 0; /* flags?? */
+ p++;
+ StrnCpy(p,myname,16);
+ strupper(p);
+ p = skip_string(p,1);
+
+ send_mailslot_reply(BROWSE_MAILSLOT,ClientDGRAM,outbuf,PTR_DIFF(p,outbuf),
+ myname,group,0,0,bcast_ip,myip);
+}
+
+/****************************************************************************
+ announce myself as a master to the PDC
+ **************************************************************************/
+static void announce_master(char *group)
+{
+ static time_t last=0;
+ time_t t = time(NULL);
+ pstring outbuf;
+ char *p;
+ struct in_addr ip,pdc_ip;
+ fstring pdcname;
+ *pdcname = 0;
+
+ if (strequal(domain_controller(),myname)) return;
+
+ if (!AM_MASTER || (last && (t-last < 10*60))) return;
+ last = t;
+
+ ip = *interpret_addr2(domain_controller());
+
+ if (zero_ip(ip)) ip = bcast_ip;
+
+ if (!name_query(ClientNMB,PrimaryGroup,
+ 0x1b,False,False,ip,&pdc_ip,queue_packet)) {
+ DEBUG(2,("Failed to find PDC at %s\n",domain_controller()));
+ return;
+ }
+
+ name_status(ClientNMB,PrimaryGroup,0x1b,False,
+ pdc_ip,NULL,pdcname,queue_packet);
+
+ if (!pdcname[0]) {
+ DEBUG(3,("Can't find netbios name of PDC at %s\n",inet_ntoa(pdc_ip)));
+ } else {
+ sync_browse_lists(pdcname,0x20,myname,PrimaryGroup,pdc_ip);
+ }
+
+
+ DEBUG(2,("Sending master announce to %s for workgroup %s\n",
+ inet_ntoa(pdc_ip),group));
+
+ bzero(outbuf,sizeof(outbuf));
+ p = outbuf;
+ CVAL(p,0) = 13; /* announce request */
+ p++;
+
+ StrnCpy(p,myname,16);
+ strupper(p);
+ p = skip_string(p,1);
+
+ send_mailslot_reply(BROWSE_MAILSLOT,ClientDGRAM,outbuf,PTR_DIFF(p,outbuf),
+ myname,PrimaryGroup,0x1b,0,pdc_ip,myip);
+}
+
+
+/*******************************************************************
+ am I listening on a name. Should check name_type as well
+
+ This is primarily used to prevent us gathering server lists from
+ other workgroups we aren't a part of
+ ******************************************************************/
+static BOOL listening(struct nmb_name *n)
+{
+ if (!strequal(n->scope,scope)) return(False);
+
+ if (strequal(n->name,myname) ||
+ strequal(n->name,PrimaryGroup) ||
+ strequal(n->name,MSBROWSE))
+ return(True);
+
+ return(False);
+}
+
+
+/*******************************************************************
+ process a domain announcement frame
+
+ Announce frames come in 3 types. Servers send host announcements
+ (command=1) to let the master browswer know they are
+ available. Master browsers send local master announcements
+ (command=15) to let other masters and backups that they are the
+ master. They also send domain announcements (command=12) to register
+ the domain
+
+ The comment field of domain announcements contains the master
+ browser name. The servertype is used by NetServerEnum to select
+ resources. We just have to pass it to smbd (via browser.dat) and let
+ the client choose using bit masks.
+ ******************************************************************/
+static void process_announce(struct packet_struct *p,int command,char *buf)
+{
+ struct dgram_packet *dgram = &p->packet.dgram;
+ int update_count = CVAL(buf,0);
+ int ttl = IVAL(buf,1)/1000;
+ char *name = buf+5;
+ int osmajor=CVAL(buf,21);
+ int osminor=CVAL(buf,22);
+ uint32 servertype = IVAL(buf,23);
+ char *comment = buf+31;
+
+ name[15] = 0;
+ comment[43] = 0;
+
+ DEBUG(3,("Announce(%d) %s count=%d ttl=%d OS=(%d,%d) type=%08x comment=%s\n",
+ command,name,update_count,ttl,osmajor,osminor,
+ servertype,comment));
+
+ if (strequal(dgram->source_name.name,myname)) return;
+
+ if (!listening(&dgram->dest_name)) return;
+
+ ttl = GET_TTL(ttl);
+
+ /* add them to our browse list */
+ add_server_entry(name,servertype,ttl,comment,True);
+
+}
+
+/*******************************************************************
+ process a master announcement frame
+ ******************************************************************/
+static void process_master_announce(struct packet_struct *p,char *buf)
+{
+ struct dgram_packet *dgram = &p->packet.dgram;
+ char *name = buf;
+
+ name[15] = 0;
+
+ DEBUG(3,("Master Announce from %s (%s)\n",name,inet_ntoa(p->ip)));
+
+ if (strequal(dgram->source_name.name,myname)) return;
+
+ if (!AM_MASTER || !listening(&dgram->dest_name)) return;
+
+ /* merge browse lists with them */
+ if (lp_domain_master())
+ sync_browse_lists(name,0x20,myname,PrimaryGroup,p->ip);
+}
+
+
+/*******************************************************************
+ process a backup list request
+
+ A client send a backup list request to ask for a list of servers on
+ the net that maintain server lists for a domain. A server is then
+ chosen from this list to send NetServerEnum commands to to list
+ available servers.
+
+ Currently samba only sends back one name in the backup list, its
+ wn. For larger nets we'll have to add backups and send "become
+ backup" requests occasionally.
+ ******************************************************************/
+static void process_backup_list(struct packet_struct *p,char *buf)
+{
+ struct dgram_packet *dgram = &p->packet.dgram;
+ int count = CVAL(buf,0);
+ int token = IVAL(buf,1);
+
+ DEBUG(3,("Backup request to %s token=%d\n",
+ namestr(&dgram->dest_name),
+ token));
+
+ if (strequal(dgram->source_name.name,myname)) return;
+
+ if (count <= 0) return;
+
+ if (!AM_MASTER ||
+ !strequal(PrimaryGroup,dgram->dest_name.name))
+ return;
+
+ if (!listening(&dgram->dest_name)) return;
+
+ send_backup_list(myname,token,
+ &dgram->source_name,
+ p->ip);
+}
+
+
+/*******************************************************************
+ work out if I win an election
+ ******************************************************************/
+static BOOL win_election(int version,uint32 criterion,int timeup,char *name)
+{
+ time_t t = time(NULL);
+ uint32 mycriterion;
+ if (version > ELECTION_VERSION) return(False);
+ if (version < ELECTION_VERSION) return(True);
+
+ mycriterion = ElectionCriterion;
+
+ if (criterion > mycriterion) return(False);
+ if (criterion < mycriterion) return(True);
+
+ if (timeup > (t - StartupTime)) return(False);
+ if (timeup < (t - StartupTime)) return(True);
+
+ if (strcasecmp(myname,name) > 0) return(False);
+
+ return(True);
+}
+
+
+/*******************************************************************
+ process a election packet
+
+ An election dynamically decides who will be the master.
+ ******************************************************************/
+static void process_election(struct packet_struct *p,char *buf)
+{
+ struct dgram_packet *dgram = &p->packet.dgram;
+ int version = CVAL(buf,0);
+ uint32 criterion = IVAL(buf,1);
+ int timeup = IVAL(buf,5)/1000;
+ char *name = buf+13;
+
+ name[15] = 0;
+
+ DEBUG(3,("Election request from %s vers=%d criterion=%08x timeup=%d\n",
+ name,version,criterion,timeup));
+
+ if (strequal(dgram->source_name.name,myname)) return;
+
+ if (!listening(&dgram->dest_name)) return;
+
+ if (win_election(version,criterion,timeup,name)) {
+ if (!RunningElection) {
+ needelection = True;
+ ElectionCount=0;
+ }
+ } else {
+ needelection = False;
+ if (RunningElection) {
+ RunningElection = False;
+ DEBUG(3,(">>> Lost election on %s <<<\n",PrimaryGroup));
+
+ /* if we are the master then remove our masterly names */
+ if (AM_MASTER)
+ become_nonmaster();
+ }
+ }
+}
+
+
+/*******************************************************************
+ process a announcement request
+
+ clients send these when they want everyone to send an announcement
+ immediately. This can cause quite a storm of packets!
+ ******************************************************************/
+static void process_announce_request(struct packet_struct *p,char *buf)
+{
+ struct dgram_packet *dgram = &p->packet.dgram;
+ int flags = CVAL(buf,0);
+ char *name = buf+1;
+
+ name[15] = 0;
+
+ DEBUG(3,("Announce request from %s flags=0x%X\n",name,flags));
+
+ if (strequal(dgram->source_name.name,myname)) return;
+
+ needannounce = True;
+}
+
+
+/****************************************************************************
+process a browse frame
+****************************************************************************/
+static void process_browse_packet(struct packet_struct *p,char *buf,int len)
+{
+ int command = CVAL(buf,0);
+ switch (command)
+ {
+ case 1: /* host announce */
+ case 12: /* domain announce */
+ case 15: /* local master announce */
+ process_announce(p,command,buf+1);
+ break;
+
+ case 2: /* announce request */
+ process_announce_request(p,buf+1);
+ break;
+
+ case 8: /* election */
+ process_election(p,buf+1);
+ break;
+
+ case 9: /* get backup list */
+ process_backup_list(p,buf+1);
+ break;
+
+ case 13: /* master announcement */
+ process_master_announce(p,buf+1);
+ break;
+ }
+}
+
+
+/****************************************************************************
+ process a domain logon packet
+ **************************************************************************/
+static void process_logon_packet(struct packet_struct *p,char *buf,int len)
+{
+ char *logname,*q;
+ pstring outbuf;
+ struct dgram_packet *dgram = &p->packet.dgram;
+ int code;
+
+ if (!lp_domain_logons()) {
+ DEBUG(3,("No domain logons\n"));
+ return;
+ }
+ if (!listening(&dgram->dest_name)) {
+ DEBUG(4,("Not listening to that domain\n"));
+ return;
+ }
+
+ q = outbuf;
+ bzero(outbuf,sizeof(outbuf));
+
+ code = SVAL(buf,0);
+ switch (code) {
+ case 0:
+ {
+ char *machine = buf+2;
+ char *user = skip_string(machine,1);
+ logname = skip_string(user,1);
+
+ SSVAL(q,0,6);
+ q += 2;
+ strcpy(q,"\\\\");
+ q += 2;
+ StrnCpy(q,myname,16);
+ strupper(q);
+ q = skip_string(q,1);
+ SSVAL(q,0,0xFFFF);
+ q += 2;
+
+ DEBUG(3,("Domain login request from %s(%s) user=%s\n",
+ machine,inet_ntoa(p->ip),user));
+ }
+ break;
+ case 7:
+ {
+ char *machine = buf+2;
+ logname = skip_string(machine,1);
+
+ SSVAL(q,0,0xc);
+ q += 2;
+ StrnCpy(q,domain_controller(),16);
+ strupper(q);
+ q = skip_string(q,1);
+ q += PutUniCode(q,domain_controller());
+ q += PutUniCode(q,dgram->dest_name.name);
+ SSVAL(q,0,0xFFFF);
+ q += 2;
+
+ DEBUG(3,("GETDC request from %s(%s)\n",
+ machine,inet_ntoa(p->ip)));
+ }
+ break;
+ default:
+ DEBUG(3,("Unknown domain request %d\n",code));
+ return;
+ }
+
+
+ send_mailslot_reply(logname,ClientDGRAM,outbuf,PTR_DIFF(q,outbuf),
+ myname,&dgram->source_name.name[0],0,0,p->ip,myip);
+}
+
+/****************************************************************************
+process udp 138 datagrams
+****************************************************************************/
+static void process_dgram(struct packet_struct *p)
+{
+ char *buf;
+ char *buf2;
+ int len;
+ struct dgram_packet *dgram = &p->packet.dgram;
+
+ if (dgram->header.msg_type != 0x10 &&
+ dgram->header.msg_type != 0x11 &&
+ dgram->header.msg_type != 0x12) {
+ /* don't process error packets etc yet */
+ return;
+ }
+
+ buf = &dgram->data[0];
+ buf -= 4; /* XXXX for the pseudo tcp length -
+ someday I need to get rid of this */
+
+ if (CVAL(buf,smb_com) != SMBtrans) return;
+
+ len = SVAL(buf,smb_vwv11);
+ buf2 = smb_base(buf) + SVAL(buf,smb_vwv12);
+
+ DEBUG(3,("datagram from %s to %s for %s of type %d len=%d\n",
+ namestr(&dgram->source_name),namestr(&dgram->dest_name),
+ smb_buf(buf),CVAL(buf2,0),len));
+
+ if (len <= 0) return;
+
+ if (strequal(smb_buf(buf),"\\MAILSLOT\\BROWSE")) {
+ process_browse_packet(p,buf2,len);
+ } else if (strequal(smb_buf(buf),"\\MAILSLOT\\NET\\NETLOGON")) {
+ process_logon_packet(p,buf2,len);
+ }
+
+}
+
+/*******************************************************************
+ find a workgroup using the specified broadcast
+ ******************************************************************/
+static BOOL find_workgroup(char *name,struct in_addr ip)
+{
+ fstring name1;
+ BOOL ret;
+ struct in_addr ipout;
+
+ strcpy(name1,MSBROWSE);
+
+ ret = name_query(ClientNMB,name1,0x1,True,False,ip,&ipout,queue_packet);
+ if (!ret) return(False);
+
+ name_status(ClientNMB,name1,0x1,False,ipout,name,NULL,queue_packet);
+
+ if (name[0] != '*') {
+ DEBUG(2,("Found workgroup %s on broadcast %s\n",name,inet_ntoa(ip)));
+ } else {
+ DEBUG(3,("Failed to find workgroup %s on broadcast %s\n",name,inet_ntoa(ip)));
+ }
+ return(name[0] != '*');
+}
+
+
+/****************************************************************************
+ a hook for announce handling - called every minute
+ **************************************************************************/
+static void do_announcements(void)
+{
+ struct domain_record *d;
+
+ for (d = domainlist; d; d = d->next) {
+ /* if the ip address is 0 then set to the broadcast */
+ if (zero_ip(d->bcast_ip)) d->bcast_ip = bcast_ip;
+
+ /* if the workgroup is '*' then find a workgroup to be part of */
+ if (d->name[0] == '*') {
+ if (!find_workgroup(d->name,d->bcast_ip)) continue;
+ add_host_entry(d->name,0x1e,False,0,SELF,
+ *interpret_addr2("255.255.255.255"));
+ if (!PrimaryGroup[0] && ip_equal(bcast_ip,d->bcast_ip)) {
+ strcpy(PrimaryGroup,d->name);
+ strupper(PrimaryGroup);
+ }
+ }
+
+ announce_host(d,myname,ServerComment);
+ }
+
+ /* if I have a domain controller then announce to it */
+ if (AM_MASTER)
+ announce_master(PrimaryGroup);
+
+ needannounce=False;
+}
+
+/*******************************************************************
+ check if someone still owns a name
+ ******************************************************************/
+static BOOL confirm_name(struct name_record *n)
+{
+ struct in_addr ipout;
+ BOOL ret = name_query(ClientNMB,n->name.name,
+ n->name.name_type,False,
+ False,n->ip,&ipout,queue_packet);
+ return(ret && ip_equal(ipout,n->ip));
+}
+
+/****************************************************************************
+reply to a name release
+****************************************************************************/
+static void reply_name_release(struct packet_struct *p)
+{
+ struct nmb_packet *nmb = &p->packet.nmb;
+ struct packet_struct p2;
+ struct nmb_packet *nmb2;
+ struct res_rec answer_rec;
+ struct in_addr ip;
+ int rcode=0;
+ int nb_flags = nmb->additional->rdata[0];
+ BOOL bcast = nmb->header.nm_flags.bcast;
+
+
+ putip((char *)&ip,&nmb->additional->rdata[2]);
+
+ {
+ struct name_record *n = find_name(&nmb->question.question_name);
+ if (n && n->unique && n->source == REGISTER &&
+ ip_equal(ip,n->ip)) {
+ remove_name(n); n = NULL;
+ }
+
+ /* XXXX under what conditions should we reject the removal?? */
+ }
+
+ DEBUG(3,("Name release on name %s rcode=%d\n",
+ namestr(&nmb->question.question_name),rcode));
+
+ if (bcast) return;
+
+ /* Send a NAME RELEASE RESPONSE */
+ p2 = *p;
+ nmb2 = &p2.packet.nmb;
+
+ nmb2->header.response = True;
+ nmb2->header.nm_flags.bcast = False;
+ nmb2->header.nm_flags.recursion_available = CanRecurse;
+ nmb2->header.nm_flags.trunc = False;
+ nmb2->header.nm_flags.authoritative = True;
+ nmb2->header.qdcount = 0;
+ nmb2->header.ancount = 1;
+ nmb2->header.nscount = 0;
+ nmb2->header.arcount = 0;
+ nmb2->header.rcode = rcode;
+
+ nmb2->answers = &answer_rec;
+ bzero((char *)nmb2->answers,sizeof(*nmb2->answers));
+
+ nmb2->answers->rr_name = nmb->question.question_name;
+ nmb2->answers->rr_type = nmb->question.question_type;
+ nmb2->answers->rr_class = nmb->question.question_class;
+ nmb2->answers->ttl = 0;
+ nmb2->answers->rdlength = 6;
+ nmb2->answers->rdata[0] = nb_flags;
+ putip(&nmb2->answers->rdata[2],(char *)&ip);
+
+ send_packet(&p2);
+}
+
+/****************************************************************************
+ reply to a reg request
+ **************************************************************************/
+static void reply_name_reg(struct packet_struct *p)
+{
+ struct nmb_packet *nmb = &p->packet.nmb;
+ char *qname = nmb->question.question_name.name;
+ BOOL wildcard = (qname[0] == '*');
+ BOOL bcast = nmb->header.nm_flags.bcast;
+ int ttl = GET_TTL(nmb->additional->ttl);
+ int name_type = nmb->question.question_name.name_type;
+ int nb_flags = nmb->additional->rdata[0];
+ struct packet_struct p2;
+ struct nmb_packet *nmb2;
+ struct res_rec answer_rec;
+ struct in_addr ip;
+ BOOL group = (nb_flags&0x80)?True:False;
+ int rcode = 0;
+
+ if (wildcard) return;
+
+ putip((char *)&ip,&nmb->additional->rdata[2]);
+
+ if (group) {
+ /* apparently we should return 255.255.255.255 for group queries (email from MS) */
+ ip = *interpret_addr2("255.255.255.255");
+ }
+
+ {
+ struct name_record *n = find_name(&nmb->question.question_name);
+
+ if (n) {
+ if (!group && !ip_equal(ip,n->ip)) {
+ /* check if the previous owner still wants it,
+ if so reject the registration, otherwise change the owner
+ and refresh */
+ if (n->source != REGISTER || confirm_name(n)) {
+ rcode = 6;
+ } else {
+ n->ip = ip;
+ n->death_time = ttl?p->timestamp+ttl*3:0;
+ DEBUG(3,("%s changed owner to %s\n",
+ namestr(&n->name),inet_ntoa(n->ip)));
+ }
+ } else {
+ /* refresh the name */
+ if (n->source != SELF)
+ n->death_time = ttl?p->timestamp + ttl*3:0;
+ }
+ } else {
+ /* add the name to our database */
+ n = add_host_entry(qname,name_type,!group,ttl,REGISTER,ip);
+ }
+ }
+
+ if (bcast) return;
+
+ DEBUG(3,("Name registration for name %s at %s rcode=%d\n",
+ namestr(&nmb->question.question_name),
+ inet_ntoa(ip),rcode));
+
+ /* Send a NAME REGISTRATION RESPONSE */
+ /* a lot of fields get copied from the query. This gives us the IP
+ and port the reply will be sent to etc */
+ p2 = *p;
+ nmb2 = &p2.packet.nmb;
+
+ nmb2->header.opcode = 5;
+ nmb2->header.response = True;
+ nmb2->header.nm_flags.bcast = False;
+ nmb2->header.nm_flags.recursion_available = CanRecurse;
+ nmb2->header.nm_flags.trunc = False;
+ nmb2->header.nm_flags.authoritative = True;
+ nmb2->header.qdcount = 0;
+ nmb2->header.ancount = 1;
+ nmb2->header.nscount = 0;
+ nmb2->header.arcount = 0;
+ nmb2->header.rcode = rcode;
+
+ nmb2->answers = &answer_rec;
+ bzero((char *)nmb2->answers,sizeof(*nmb2->answers));
+
+ nmb2->answers->rr_name = nmb->question.question_name;
+ nmb2->answers->rr_type = nmb->question.question_type;
+ nmb2->answers->rr_class = nmb->question.question_class;
+
+ nmb2->answers->ttl = ttl;
+ nmb2->answers->rdlength = 6;
+ nmb2->answers->rdata[0] = nb_flags;
+ putip(&nmb2->answers->rdata[2],(char *)&ip);
+
+ send_packet(&p2);
+}
+
+
+/****************************************************************************
+reply to a name status query
+****************************************************************************/
+static void reply_name_status(struct packet_struct *p)
+{
+ struct nmb_packet *nmb = &p->packet.nmb;
+ char *qname = nmb->question.question_name.name;
+ BOOL wildcard = (qname[0] == '*');
+ struct packet_struct p2;
+ struct nmb_packet *nmb2;
+ struct res_rec answer_rec;
+ char *buf;
+ int count;
+ int rcode = 0;
+ struct name_record *n = find_name(&nmb->question.question_name);
+
+ DEBUG(3,("Name status for name %s\n",
+ namestr(&nmb->question.question_name)));
+
+ if (!wildcard && (!n || n->source != SELF))
+ return;
+
+ /* Send a POSITIVE NAME STATUS RESPONSE */
+ /* a lot of fields get copied from the query. This gives us the IP
+ and port the reply will be sent to etc */
+ p2 = *p;
+ nmb2 = &p2.packet.nmb;
+
+ nmb2->header.response = True;
+ nmb2->header.nm_flags.bcast = False;
+ nmb2->header.nm_flags.recursion_available = CanRecurse;
+ nmb2->header.nm_flags.trunc = False;
+ nmb2->header.nm_flags.authoritative = True; /* WfWg ignores
+ non-authoritative answers */
+ nmb2->header.qdcount = 0;
+ nmb2->header.ancount = 1;
+ nmb2->header.nscount = 0;
+ nmb2->header.arcount = 0;
+ nmb2->header.rcode = rcode;
+
+ nmb2->answers = &answer_rec;
+ bzero((char *)nmb2->answers,sizeof(*nmb2->answers));
+
+
+ nmb2->answers->rr_name = nmb->question.question_name;
+ nmb2->answers->rr_type = nmb->question.question_type;
+ nmb2->answers->rr_class = nmb->question.question_class;
+ nmb2->answers->ttl = 0;
+
+ for (count=0, n = namelist ; n; n = n->next) {
+ if (n->source != SELF) continue;
+ count++;
+ }
+
+ count = MIN(count,400/18); /* XXXX hack, we should calculate exactly
+ how many will fit */
+
+
+ buf = &nmb2->answers->rdata[0];
+ SCVAL(buf,0,count);
+ buf += 1;
+
+ for (n = namelist ; n; n = n->next)
+ {
+ if (n->source != SELF) continue;
+
+ bzero(buf,18);
+ strcpy(buf,n->name.name);
+ strupper(buf);
+ buf[15] = n->name.name_type;
+ buf += 16;
+ buf[0] = 0x4; /* active */
+ if (!n->unique) buf[0] |= 0x80; /* group */
+ buf += 2;
+ count--;
+ }
+
+ /* XXXXXXX we should fill in more fields of the statistics structure */
+ bzero(buf,64);
+ {
+ extern int num_good_sends,num_good_receives;
+ SIVAL(buf,20,num_good_sends);
+ SIVAL(buf,24,num_good_receives);
+ }
+ SIVAL(buf,46,0xFFB8E5); /* undocumented - used by NT */
+
+ buf += 64;
+
+ nmb2->answers->rdlength = PTR_DIFF(buf,&nmb2->answers->rdata[0]);
+
+ send_packet(&p2);
+}
+
+
+
+/****************************************************************************
+reply to a name query
+****************************************************************************/
+static void reply_name_query(struct packet_struct *p)
+{
+ struct nmb_packet *nmb = &p->packet.nmb;
+ char *qname = nmb->question.question_name.name;
+ BOOL wildcard = (qname[0] == '*');
+ BOOL bcast = nmb->header.nm_flags.bcast;
+ struct in_addr retip;
+ int name_type = nmb->question.question_name.name_type;
+ struct packet_struct p2;
+ struct nmb_packet *nmb2;
+ struct res_rec answer_rec;
+ int ttl=0;
+ int rcode=0;
+ BOOL unique = True;
+
+ DEBUG(3,("Name query for %s from %s (bcast=%s) - ",
+ namestr(&nmb->question.question_name),
+ inet_ntoa(p->ip),
+ BOOLSTR(bcast)));
+
+ if (wildcard)
+ retip = myip;
+
+ if (!wildcard) {
+ struct name_record *n = find_name(&nmb->question.question_name);
+
+ if (!n) {
+ struct in_addr ip;
+ unsigned long a;
+
+ /* only do DNS lookups if the query is for type 0x20 or type 0x0 */
+ if (name_type != 0x20 && name_type != 0) {
+ DEBUG(3,("not found\n"));
+ return;
+ }
+
+ /* look it up with DNS */
+ a = interpret_addr(qname);
+
+ putip((char *)&ip,(char *)&a);
+
+ if (!a) {
+ /* no luck with DNS. We could possibly recurse here XXXX */
+ /* if this isn't a bcast then we should send a negative reply XXXX */
+ DEBUG(3,("no recursion\n"));
+ add_host_entry(qname,name_type,True,60*60,DNSFAIL,ip);
+ return;
+ }
+
+ /* add it to our cache of names. give it 2 hours in the cache */
+ n = add_host_entry(qname,name_type,True,2*60*60,DNS,ip);
+
+ /* failed to add it? yikes! */
+ if (!n) return;
+ }
+
+ /* don't respond to bcast queries for group names unless we own them */
+ if (bcast && !n->unique && !n->source == SELF) {
+ DEBUG(3,("no bcast replies\n"));
+ return;
+ }
+
+ /* don't respond to bcast queries for addresses on the same net as the
+ machine doing the querying unless its our IP */
+ if (bcast &&
+ n->source != SELF &&
+ same_net(n->ip,p->ip)) {
+ DEBUG(3,("same net\n"));
+ return;
+ }
+
+ /* is our entry already dead? */
+ if (n->death_time) {
+ if (n->death_time < p->timestamp) return;
+ ttl = n->death_time - p->timestamp;
+ }
+
+ retip = n->ip;
+ unique = n->unique;
+
+ /* it may have been an earlier failure */
+ if (n->source == DNSFAIL) {
+ DEBUG(3,("DNSFAIL\n"));
+ return;
+ }
+ }
+
+ /* if the IP is 0 then substitute my IP - we should see which one is on the
+ right interface for the caller to do this right XXX */
+ if (zero_ip(retip)) retip = myip;
+
+ DEBUG(3,("OK %s rcode=%d\n",inet_ntoa(retip),rcode));
+
+ /* a lot of fields get copied from the query. This gives us the IP
+ and port the reply will be sent to etc */
+ p2 = *p;
+ nmb2 = &p2.packet.nmb;
+
+ nmb2->header.response = True;
+ nmb2->header.nm_flags.bcast = False;
+ nmb2->header.nm_flags.recursion_available = CanRecurse;
+ nmb2->header.nm_flags.trunc = False;
+ nmb2->header.nm_flags.authoritative = True; /* WfWg ignores
+ non-authoritative answers */
+ nmb2->header.qdcount = 0;
+ nmb2->header.ancount = 1;
+ nmb2->header.nscount = 0;
+ nmb2->header.arcount = 0;
+ nmb2->header.rcode = rcode;
+
+ nmb2->answers = &answer_rec;
+ bzero((char *)nmb2->answers,sizeof(*nmb2->answers));
+
+ nmb2->answers->rr_name = nmb->question.question_name;
+ nmb2->answers->rr_type = nmb->question.question_type;
+ nmb2->answers->rr_class = nmb->question.question_class;
+ nmb2->answers->ttl = ttl;
+ nmb2->answers->rdlength = 6;
+ nmb2->answers->rdata[0] = unique?0:0x80;
+ nmb2->answers->rdata[1] = 0;
+ putip(&nmb2->answers->rdata[2],(char *)&retip);
+
+ send_packet(&p2);
+}
+
+
+
+/* the global packet linked-list. incoming entries are added to the
+ end of this list. it is supposed to remain fairly short so we
+ won't bother with an end pointer. */
+static struct packet_struct *packet_queue = NULL;
+
+
+/*******************************************************************
+ queue a packet into the packet queue
+ ******************************************************************/
+static void queue_packet(struct packet_struct *packet)
+{
+ struct packet_struct *p;
+ if (!packet_queue) {
+ packet->prev = NULL;
+ packet->next = NULL;
+ packet_queue = packet;
+ return;
+ }
+
+ /* find the bottom */
+ for (p=packet_queue;p->next;p=p->next) ;
+
+ p->next = packet;
+ packet->next = NULL;
+ packet->prev = p;
+}
+
+/****************************************************************************
+ process a nmb packet
+ ****************************************************************************/
+static void process_nmb(struct packet_struct *p)
+{
+ struct nmb_packet *nmb = &p->packet.nmb;
+
+ /* if this is a response then ignore it */
+ if (nmb->header.response) return;
+
+ switch (nmb->header.opcode)
+ {
+ case 5:
+ case 8:
+ case 9:
+ if (nmb->header.qdcount>0 &&
+ nmb->header.arcount>0) {
+ reply_name_reg(p);
+ return;
+ }
+ break;
+
+ case 0:
+ if (nmb->header.qdcount>0)
+ {
+ switch (nmb->question.question_type)
+ {
+ case 0x20:
+ reply_name_query(p);
+ break;
+
+ case 0x21:
+ reply_name_status(p);
+ break;
+ }
+ return;
+ }
+ break;
+
+ case 6:
+ if (nmb->header.qdcount>0 &&
+ nmb->header.arcount>0) {
+ reply_name_release(p);
+ return;
+ }
+ break;
+ }
+
+}
+
+
+
+/*******************************************************************
+ run elements off the packet queue till its empty
+ ******************************************************************/
+static void run_packet_queue(void)
+{
+ struct packet_struct *p;
+
+ while ((p=packet_queue)) {
+ switch (p->packet_type)
+ {
+ case NMB_PACKET:
+ process_nmb(p);
+ break;
+
+ case DGRAM_PACKET:
+ process_dgram(p);
+ break;
+ }
+
+ packet_queue = packet_queue->next;
+ if (packet_queue) packet_queue->prev = NULL;
+ free_packet(p);
+ }
+}
+
+
+/****************************************************************************
+ The main select loop, listen for packets and respond
+ ***************************************************************************/
+void process(void)
+{
+
+ while (True)
+ {
+ fd_set fds;
+ int selrtn;
+ struct timeval timeout;
+
+ if (needelection && PrimaryGroup[0] && !RunningElection) {
+ DEBUG(3,(">>> Starting election on %s <<<\n",PrimaryGroup));
+ ElectionCount = 0;
+ RunningElection = True;
+ needelection = False;
+ }
+
+ FD_ZERO(&fds);
+ FD_SET(ClientNMB,&fds);
+ FD_SET(ClientDGRAM,&fds);
+ /* during elections we need to send election packets at one
+ second intervals */
+ timeout.tv_sec = RunningElection?1:NMBD_SELECT_LOOP;
+ timeout.tv_usec = 0;
+
+ selrtn = sys_select(&fds,&timeout);
+
+ if (FD_ISSET(ClientNMB,&fds)) {
+ struct packet_struct *packet = read_packet(ClientNMB,NMB_PACKET);
+ if (packet) queue_packet(packet);
+ }
+
+ if (FD_ISSET(ClientDGRAM,&fds)) {
+ struct packet_struct *packet = read_packet(ClientDGRAM,DGRAM_PACKET);
+ if (packet) queue_packet(packet);
+ }
+
+ if (RunningElection)
+ run_election();
+
+ run_packet_queue();
+
+ do_announcements();
+
+ housekeeping();
+ }
+}
+
+
+/****************************************************************************
+ open the socket communication
+****************************************************************************/
+static BOOL open_sockets(BOOL isdaemon,int port)
+{
+ struct hostent *hp;
+
+ /* get host info */
+ if ((hp = Get_Hostbyname(myhostname)) == 0)
+ {
+ DEBUG(0,( "Get_Hostbyname: Unknown host. %s\n",myhostname));
+ return False;
+ }
+
+ if (isdaemon)
+ ClientNMB = open_socket_in(SOCK_DGRAM, port,0);
+ else
+ ClientNMB = 0;
+
+ ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3);
+
+ if (ClientNMB == -1)
+ return(False);
+
+ signal(SIGPIPE, SIGNAL_CAST sig_pipe);
+
+ set_socket_options(ClientNMB,"SO_BROADCAST");
+ set_socket_options(ClientDGRAM,"SO_BROADCAST");
+
+ DEBUG(3, ("Socket opened.\n"));
+ return True;
+}
+
+
+/*******************************************************************
+ check that a IP, bcast and netmask and consistent. Must be a 1s
+ broadcast
+ ******************************************************************/
+static BOOL ip_consistent(struct in_addr ip,struct in_addr bcast,
+ struct in_addr nmask)
+{
+ unsigned long a_ip,a_bcast,a_nmask;
+
+ a_ip = ntohl(ip.s_addr);
+ a_bcast = ntohl(bcast.s_addr);
+ a_nmask = ntohl(nmask.s_addr);
+
+ /* check the netmask is sane */
+ if (((a_nmask>>24)&0xFF) != 0xFF) {
+ DEBUG(0,("Insane netmask %s\n",inet_ntoa(nmask)));
+ return(False);
+ }
+
+ /* check the IP and bcast are on the same net */
+ if ((a_ip&a_nmask) != (a_bcast&a_nmask)) {
+ DEBUG(0,("IP and broadcast are on different nets!\n"));
+ return(False);
+ }
+
+ /* check the IP and bcast are on the same net */
+ if ((a_bcast|a_nmask) != 0xFFFFFFFF) {
+ DEBUG(0,("Not a ones based broadcast %s\n",inet_ntoa(bcast)));
+ return(False);
+ }
+
+ return(True);
+}
+
+/****************************************************************************
+ initialise connect, service and file structs
+****************************************************************************/
+static BOOL init_structs(void )
+{
+ if (!get_myname(myhostname,got_myip?NULL:&myip))
+ return(False);
+
+ /* Read the broadcast address from the interface */
+ {
+ struct in_addr ip0,ip1,ip2;
+
+ ip0 = myip;
+
+ if (!(got_bcast && got_nmask))
+ {
+ get_broadcast(&ip0,&ip1,&ip2);
+
+ if (!got_myip)
+ myip = ip0;
+
+ if (!got_bcast)
+ bcast_ip = ip1;
+
+ if (!got_nmask)
+ Netmask = ip2;
+ }
+
+ DEBUG(1,("Using IP %s ",inet_ntoa(myip)));
+ DEBUG(1,("broadcast %s ",inet_ntoa(bcast_ip)));
+ DEBUG(1,("netmask %s\n",inet_ntoa(Netmask)));
+
+ if (!ip_consistent(myip,bcast_ip,Netmask)) {
+ DEBUG(0,("WARNING: The IP address, broadcast and Netmask are not consistent\n"));
+ DEBUG(0,("You are likely to experience problems with this setup!\n"));
+ }
+ }
+
+ if (! *myname) {
+ char *p;
+ strcpy(myname,myhostname);
+ p = strchr(myname,'.');
+ if (p) *p = 0;
+ }
+
+ {
+ extern fstring local_machine;
+ strcpy(local_machine,myname);
+ strupper(local_machine);
+ }
+
+ return True;
+}
+
+/****************************************************************************
+usage on the program
+****************************************************************************/
+static void usage(char *pname)
+{
+ DEBUG(0,("Incorrect program usage - is the command line correct?\n"));
+
+ printf("Usage: %s [-n name] [-B bcast address] [-D] [-p port] [-d debuglevel] [-l log basename]\n",pname);
+ 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-n netbiosname. the netbios name to advertise for this host\n");
+ printf("\t-B broadcast address the address to use for broadcasts\n");
+ printf("\t-N netmask the netmask to use for subnet determination\n");
+ printf("\t-H hosts file load a netbios hosts file\n");
+ printf("\t-I ip-address override the IP address\n");
+ printf("\t-G group name add a group name to be part of\n");
+ printf("\t-C comment sets the machine comment that appears in browse lists\n");
+ printf("\n");
+}
+
+
+/****************************************************************************
+ main program
+ **************************************************************************/
+int main(int argc,char *argv[])
+{
+ int port = NMB_PORT;
+ int opt;
+ extern FILE *dbf;
+ extern char *optarg;
+
+ *host_file = 0;
+
+#if 0
+ sleep(10);
+#endif
+
+ StartupTime = time(NULL);
+
+ TimeInit();
+
+ strcpy(debugf,NMBLOGFILE);
+
+ setup_logging(argv[0],False);
+
+ charset_initialise();
+
+#ifdef LMHOSTSFILE
+ strcpy(host_file,LMHOSTSFILE);
+#endif
+
+ /* this is for people who can't start the program correctly */
+ while (argc > 1 && (*argv[1] != '-'))
+ {
+ argv++;
+ argc--;
+ }
+
+ fault_setup(fault_continue);
+
+ signal(SIGHUP,SIGNAL_CAST sig_hup);
+
+ bcast_ip = *interpret_addr2("0.0.0.0");
+ myip = *interpret_addr2("0.0.0.0");
+
+ while ((opt = getopt (argc, argv, "s:T:I:C:bAi:B:N:Rn:l:d:Dp:hSH:G:")) != EOF)
+ switch (opt)
+ {
+ case 's':
+ strcpy(servicesf,optarg);
+ break;
+ case 'C':
+ strcpy(ServerComment,optarg);
+ break;
+ case 'G':
+ add_domain_entry(optarg,bcast_ip);
+ break;
+ case 'H':
+ strcpy(host_file,optarg);
+ break;
+ case 'I':
+ myip = *interpret_addr2(optarg);
+ got_myip = True;
+ break;
+ case 'B':
+ bcast_ip = *interpret_addr2(optarg);
+ got_bcast = True;
+ break;
+ case 'N':
+ Netmask = *interpret_addr2(optarg);
+ got_nmask = True;
+ break;
+ case 'n':
+ strcpy(myname,optarg);
+ break;
+ case 'l':
+ sprintf(debugf,"%s.nmb",optarg);
+ break;
+ case 'i':
+ strcpy(scope,optarg);
+ strupper(scope);
+ break;
+ case 'D':
+ is_daemon = True;
+ break;
+ case 'd':
+ DEBUGLEVEL = atoi(optarg);
+ break;
+ case 'p':
+ port = atoi(optarg);
+ break;
+ case 'h':
+ usage(argv[0]);
+ exit(0);
+ break;
+ default:
+ if (!is_a_socket(0))
+ usage(argv[0]);
+ break;
+ }
+
+ DEBUG(1,("%s netbios nameserver version %s started\n",timestring(),VERSION));
+ DEBUG(1,("Copyright Andrew Tridgell 1994\n"));
+
+ init_structs();
+
+ if (!reload_services(False))
+ return(-1);
+
+ if (*host_file)
+ {
+ load_hosts_file(host_file);
+ DEBUG(3,("Loaded hosts file\n"));
+ }
+
+ if (!*ServerComment)
+ strcpy(ServerComment,"Samba %v");
+ string_sub(ServerComment,"%v",VERSION);
+ string_sub(ServerComment,"%h",myhostname);
+
+ add_my_names();
+
+ DEBUG(3,("Checked names\n"));
+
+ dump_names();
+
+ DEBUG(3,("Dumped names\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(2,("%s becoming a daemon\n",timestring()));
+ become_daemon();
+ }
+
+
+ DEBUG(3,("Opening sockets\n"));
+
+ if (open_sockets(is_daemon,port))
+ {
+ process();
+ close_sockets();
+ }
+
+ if (dbf)
+ fclose(dbf);
+ return(0);
+}
generated by cgit (git 2.34.1) at 2024-11-07 12:32:25 +0000