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-rw-r--r--source3/nameresp.c625
1 files changed, 625 insertions, 0 deletions
diff --git a/source3/nameresp.c b/source3/nameresp.c
new file mode 100644
index 0000000000..a4a55c9f1b
--- /dev/null
+++ b/source3/nameresp.c
@@ -0,0 +1,625 @@
+/*
+ Unix SMB/Netbios implementation.
+ Version 1.9.
+ NBT netbios library routines
+ 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 "localnet.h"
+#include "loadparm.h"
+
+/* this is our initiated name query response database */
+struct name_response_record *nameresponselist = NULL;
+
+extern struct in_addr myip;
+extern int DEBUGLEVEL;
+
+static uint16 name_trn_id=0;
+BOOL CanRecurse = True;
+extern pstring scope;
+extern pstring myname;
+extern struct in_addr ipzero;
+
+
+/***************************************************************************
+ add an initated name query into the list
+ **************************************************************************/
+extern void add_response_record(struct name_response_record *n)
+{
+ struct name_response_record *n2;
+
+ if (!nameresponselist)
+ {
+ nameresponselist = n;
+ n->prev = NULL;
+ n->next = NULL;
+ return;
+ }
+
+ for (n2 = nameresponselist; n2->next; n2 = n2->next) ;
+
+ n2->next = n;
+ n->next = NULL;
+ n->prev = n2;
+}
+
+
+/*******************************************************************
+ remove old name response entries
+ ******************************************************************/
+void expire_netbios_response_entries(time_t t)
+{
+ struct name_response_record *n;
+ struct name_response_record *nextn;
+
+ for (n = nameresponselist; n; n = nextn)
+ {
+ if (n->start_time < t)
+ {
+ DEBUG(3,("Removing dead name query for %s %s (num_msgs=%d)\n",
+ inet_ntoa(n->to_ip), namestr(&n->name), n->num_msgs));
+
+ if (n->cmd_type == CHECK_MASTER && n->num_msgs == 0)
+ {
+ if (n->num_msgs > 1)
+ {
+ /* more than one master browser detected on a subnet.
+ there is a configuration problem. force an election */
+ struct domain_record *d;
+ if ((d = find_domain(n->to_ip)))
+ {
+ send_election(d,n->name.name,0,0,myname);
+ }
+ }
+
+ /* if no response received, the master browser must have gone */
+ browser_gone(n->name.name, n->to_ip);
+ }
+
+ nextn = n->next;
+
+ if (n->prev) n->prev->next = n->next;
+ if (n->next) n->next->prev = n->prev;
+
+ if (nameresponselist == n) nameresponselist = n->next;
+
+ free(n);
+ }
+ else
+ {
+ nextn = n->next;
+ }
+ }
+}
+
+
+/****************************************************************************
+ reply to a netbios name packet
+ ****************************************************************************/
+void reply_netbios_packet(struct packet_struct *p1,int trn_id,int rcode,int opcode,
+ struct nmb_name *rr_name,int rr_type,int rr_class,int ttl,
+ char *data,int len)
+{
+ struct packet_struct p;
+ struct nmb_packet *nmb = &p.packet.nmb;
+ struct res_rec answers;
+ char *packet_type = "unknown";
+
+ p = *p1;
+
+ if (rr_type == NMB_STATUS) packet_type = "nmb_status";
+ if (rr_type == NMB_QUERY ) packet_type = "nmb_query";
+ if (rr_type == NMB_REG ) packet_type = "nmb_reg";
+ if (rr_type == NMB_REL ) packet_type = "nmb_rel";
+
+ DEBUG(4,("replying netbios packet: %s %s\n",
+ packet_type, namestr(rr_name), inet_ntoa(p.ip)));
+
+ nmb->header.name_trn_id = trn_id;
+ nmb->header.opcode = opcode;
+ nmb->header.response = True;
+ nmb->header.nm_flags.bcast = False;
+ nmb->header.nm_flags.recursion_available = True;
+ nmb->header.nm_flags.recursion_desired = True;
+ nmb->header.nm_flags.trunc = False;
+ nmb->header.nm_flags.authoritative = True;
+
+ nmb->header.qdcount = 0;
+ nmb->header.ancount = 1;
+ nmb->header.nscount = 0;
+ nmb->header.arcount = 0;
+ nmb->header.rcode = 0;
+
+ bzero((char*)&nmb->question,sizeof(nmb->question));
+
+ nmb->answers = &answers;
+ bzero((char*)nmb->answers,sizeof(*nmb->answers));
+
+ nmb->answers->rr_name = *rr_name;
+ nmb->answers->rr_type = rr_type;
+ nmb->answers->rr_class = rr_class;
+ nmb->answers->ttl = ttl;
+
+ if (data && len)
+ {
+ nmb->answers->rdlength = len;
+ memcpy(nmb->answers->rdata, data, len);
+ }
+
+ p.packet_type = NMB_PACKET;
+
+ debug_nmb_packet(&p);
+
+ send_packet(&p);
+}
+
+
+/****************************************************************************
+ initiate a netbios packet
+ ****************************************************************************/
+uint16 initiate_netbios_packet(int fd,int quest_type,char *name,int name_type,
+ int nb_flags,BOOL bcast,BOOL recurse,struct in_addr to_ip)
+{
+ struct packet_struct p;
+ struct nmb_packet *nmb = &p.packet.nmb;
+ struct res_rec additional_rec;
+ char *packet_type = "unknown";
+ int opcode = -1;
+
+ if (quest_type == NMB_STATUS) { packet_type = "nmb_status"; opcode = 0; }
+ if (quest_type == NMB_QUERY ) { packet_type = "nmb_query"; opcode = 0; }
+ if (quest_type == NMB_REG ) { packet_type = "nmb_reg"; opcode = 5; }
+ if (quest_type == NMB_REL ) { packet_type = "nmb_rel"; opcode = 6; }
+
+ DEBUG(4,("initiating netbios packet: %s %s(%x) (bcast=%s) %s\n",
+ packet_type, name, name_type, BOOLSTR(bcast), inet_ntoa(to_ip)));
+
+ if (opcode == -1) return False;
+
+ bzero((char *)&p,sizeof(p));
+
+ if (!name_trn_id) name_trn_id = (time(NULL)%(unsigned)0x7FFF) +
+ (getpid()%(unsigned)100);
+ name_trn_id = (name_trn_id+1) % (unsigned)0x7FFF;
+
+ nmb->header.name_trn_id = name_trn_id;
+ nmb->header.opcode = opcode;
+ nmb->header.response = False;
+ nmb->header.nm_flags.bcast = bcast;
+ nmb->header.nm_flags.recursion_available = CanRecurse;
+ nmb->header.nm_flags.recursion_desired = recurse;
+ nmb->header.nm_flags.trunc = False;
+ nmb->header.nm_flags.authoritative = False;
+ nmb->header.rcode = 0;
+ nmb->header.qdcount = 1;
+ nmb->header.ancount = 0;
+ nmb->header.nscount = 0;
+ nmb->header.arcount = (quest_type==NMB_REG || quest_type==NMB_REL) ? 1 : 0;
+
+ make_nmb_name(&nmb->question.question_name,name,name_type,scope);
+
+ nmb->question.question_type = quest_type;
+ nmb->question.question_class = 0x1;
+
+ if (quest_type == NMB_REG || quest_type == NMB_REL)
+ {
+ nmb->additional = &additional_rec;
+ bzero((char *)nmb->additional,sizeof(*nmb->additional));
+
+ nmb->additional->rr_name = nmb->question.question_name;
+ nmb->additional->rr_type = nmb->question.question_type;
+ nmb->additional->rr_class = nmb->question.question_class;
+
+ nmb->additional->ttl = quest_type == NMB_REG ? lp_max_ttl() : 0;
+ nmb->additional->rdlength = 6;
+ nmb->additional->rdata[0] = nb_flags;
+ putip(&nmb->additional->rdata[2],(char *)&myip);
+ }
+
+ p.ip = to_ip;
+ p.port = NMB_PORT;
+ p.fd = fd;
+ p.timestamp = time(NULL);
+ p.packet_type = NMB_PACKET;
+
+ if (!send_packet(&p))
+ return(0);
+
+ return(name_trn_id);
+}
+
+
+void send_name_reg(void)
+{
+ struct packet_struct p;
+ struct nmb_packet *nmb = &p.packet.nmb;
+ int rcode = 0;
+
+ nmb->header.opcode = 5;
+ nmb->header.response = True;
+ nmb->header.nm_flags.bcast = False;
+ nmb->header.nm_flags.recursion_available = CanRecurse;
+ nmb->header.nm_flags.recursion_desired = CanRecurse;
+ nmb->header.nm_flags.trunc = False;
+ nmb->header.nm_flags.authoritative = True;
+ nmb->header.qdcount = 0;
+ nmb->header.ancount = 1;
+ nmb->header.nscount = 0;
+ nmb->header.arcount = 0;
+ nmb->header.rcode = rcode;
+
+ send_packet(&p);
+}
+
+
+/****************************************************************************
+ wrapper function to override a broadcast message and send it to the WINS
+ name server instead, if it exists. if wins is false, and there has been no
+ WINS server specified, the packet will NOT be sent.
+ ****************************************************************************/
+void queue_netbios_pkt_wins(int fd,int quest_type,enum cmd_type cmd,
+ char *name,int name_type,int nb_flags,
+ BOOL bcast,BOOL recurse,struct in_addr to_ip)
+{
+ if ((!lp_wins_support()) && (*lp_wins_server()))
+ {
+ /* samba is not a WINS server, and we are using a WINS server */
+ struct in_addr wins_ip;
+ wins_ip = *interpret_addr2(lp_wins_server());
+
+ if (!zero_ip(wins_ip))
+ {
+ bcast = False;
+ to_ip = wins_ip;
+ }
+ else
+ {
+ /* oops. smb.conf's wins server parameter MUST be a host_name
+ or an ip_address. */
+ DEBUG(0,("invalid smb.conf parameter 'wins server'\n"));
+ }
+ }
+
+ if (zero_ip(to_ip)) return;
+
+ queue_netbios_packet(fd, quest_type, cmd,
+ name, name_type, nb_flags,
+ bcast, recurse, to_ip);
+}
+
+/****************************************************************************
+ create a name query response record
+ **************************************************************************/
+static struct name_response_record *make_name_query_record(
+ enum cmd_type cmd,int id,int fd,
+ char *name,int type,
+ BOOL bcast,BOOL recurse,
+ struct in_addr ip)
+{
+ struct name_response_record *n;
+
+ if (!name || !name[0]) return NULL;
+
+ if (!(n = (struct name_response_record *)malloc(sizeof(*n))))
+ return(NULL);
+
+ n->response_id = id;
+ n->cmd_type = cmd;
+ n->fd = fd;
+ make_nmb_name(&n->name, name, type, scope);
+ n->bcast = bcast;
+ n->recurse = recurse;
+ n->to_ip = ip;
+ n->start_time = time(NULL);
+ n->num_msgs = 0;
+
+ return n;
+}
+
+
+/****************************************************************************
+ initiate a netbios name query to find someone's or someones' IP
+ this is intended to be used (not exclusively) for broadcasting to
+ master browsers (WORKGROUP(1d or 1b) or __MSBROWSE__(1)) to get
+ complete lists across a wide area network
+ ****************************************************************************/
+void queue_netbios_packet(int fd,int quest_type,enum cmd_type cmd,char *name,
+ int name_type,int nb_flags,BOOL bcast,BOOL recurse,
+ struct in_addr to_ip)
+{
+ uint16 id = initiate_netbios_packet(fd, quest_type, name, name_type,
+ nb_flags, bcast, recurse, to_ip);
+ struct name_response_record *n;
+
+ if (id == 0) return;
+
+ if ((n = make_name_query_record(cmd,id,fd,name,name_type,bcast,recurse,to_ip)))
+ {
+ add_response_record(n);
+ }
+}
+
+
+/****************************************************************************
+ find a response in the name query response list
+ **************************************************************************/
+struct name_response_record *find_name_query(uint16 id)
+{
+ struct name_response_record *n;
+
+ for (n = nameresponselist; n; n = n->next)
+ {
+ if (n->response_id == id) {
+ return n;
+ }
+ }
+
+ return NULL;
+}
+
+
+/*******************************************************************
+ 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
+ ******************************************************************/
+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;
+}
+
+/*******************************************************************
+ run elements off the packet queue till its empty
+ ******************************************************************/
+void run_packet_queue()
+{
+ 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);
+ }
+}
+
+/****************************************************************************
+ listens for NMB or DGRAM packets, and queues them
+ ***************************************************************************/
+void listen_for_packets(BOOL run_election)
+{
+ fd_set fds;
+ int selrtn;
+ struct timeval timeout;
+
+ 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 = run_election ? 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);
+ }
+}
+
+
+
+/****************************************************************************
+interpret a node status response. this is pretty hacked: we need two bits of
+info. a) the name of the workgroup b) the name of the server. it will also
+add all the names it finds into the namelist.
+****************************************************************************/
+BOOL interpret_node_status(char *p, struct nmb_name *name,int t,
+ char *serv_name, struct in_addr ip)
+{
+ int level = t==0x20 ? 4 : 0;
+ int numnames = CVAL(p,0);
+ BOOL found = False;
+
+ DEBUG(level,("received %d names\n",numnames));
+
+ p += 1;
+
+ if (serv_name) *serv_name = 0;
+
+ while (numnames--)
+ {
+ char qname[17];
+ int type;
+ fstring flags;
+ int nb_flags;
+
+ BOOL group = False;
+ BOOL add = False;
+
+ *flags = 0;
+
+ StrnCpy(qname,p,15);
+ type = CVAL(p,15);
+ nb_flags = p[16];
+
+ p += 18;
+
+ if (NAME_GROUP (nb_flags)) { strcat(flags,"<GROUP> "); group=True;}
+ if (NAME_BFLAG (nb_flags)) { strcat(flags,"B "); }
+ if (NAME_PFLAG (nb_flags)) { strcat(flags,"P "); }
+ if (NAME_MFLAG (nb_flags)) { strcat(flags,"M "); }
+ if (NAME__FLAG (nb_flags)) { strcat(flags,"_ "); }
+ if (NAME_DEREG (nb_flags)) { strcat(flags,"<DEREGISTERING> "); }
+ if (NAME_CONFLICT (nb_flags)) { strcat(flags,"<CONFLICT> "); add=True;}
+ if (NAME_ACTIVE (nb_flags)) { strcat(flags,"<ACTIVE> "); add=True; }
+ if (NAME_PERMANENT(nb_flags)) { strcat(flags,"<PERMANENT> "); add=True;}
+
+ /* might as well update our namelist while we're at it */
+ if (add)
+ {
+ struct in_addr nameip;
+ enum name_source src;
+
+ if (ip_equal(ip, myip))
+ {
+ nameip = ipzero;
+ src = SELF;
+ }
+ else
+ {
+ nameip = ip;
+ src = STATUS_QUERY;
+ }
+ add_netbios_entry(qname,type,nb_flags,2*60*60,src,nameip);
+ }
+
+ /* we want the server name */
+ if (serv_name && !*serv_name && !group && t == 0)
+ {
+ StrnCpy(serv_name,qname,15);
+ serv_name[15] = 0;
+ }
+
+ /* looking for a name and type? */
+ if (name && !found && (t == type))
+ {
+ /* take a guess at some of the name types we're going to ask for.
+ evaluate whether they are group names or no... */
+ if (((t == 0x1b || t == 0x1d ) && !group) ||
+ ((t == 0x20 || t == 0x1c || t == 0x1e) && group))
+ {
+ found = True;
+ make_nmb_name(name,qname,type,scope);
+ }
+ }
+
+ DEBUG(level,("\t%s(0x%x)\t%s\n",qname,type,flags));
+ }
+ DEBUG(level,("num_good_sends=%d num_good_receives=%d\n",
+ IVAL(p,20),IVAL(p,24)));
+ return found;
+}
+
+
+/****************************************************************************
+ construct and send a netbios DGRAM
+
+ Note that this currently sends all answers to port 138. thats the
+ wrong things to do! I should send to the requestors port. XXX
+ **************************************************************************/
+BOOL send_mailslot_reply(char *mailslot,int fd,char *buf,int len,char *srcname,
+ char *dstname,int src_type,int dest_type,
+ struct in_addr dest_ip,struct in_addr src_ip)
+{
+ struct packet_struct p;
+ struct dgram_packet *dgram = &p.packet.dgram;
+ char *ptr,*p2;
+ char tmp[4];
+
+ bzero((char *)&p,sizeof(p));
+
+ dgram->header.msg_type = 0x11; /* DIRECT GROUP DATAGRAM */
+ dgram->header.flags.node_type = M_NODE;
+ dgram->header.flags.first = True;
+ dgram->header.flags.more = False;
+ dgram->header.dgm_id = name_trn_id++;
+ dgram->header.source_ip = src_ip;
+ dgram->header.source_port = DGRAM_PORT;
+ dgram->header.dgm_length = 0; /* let build_dgram() handle this */
+ dgram->header.packet_offset = 0;
+
+ make_nmb_name(&dgram->source_name,srcname,src_type,scope);
+ make_nmb_name(&dgram->dest_name,dstname,dest_type,scope);
+
+ ptr = &dgram->data[0];
+
+ /* now setup the smb part */
+ ptr -= 4; /* XXX ugliness because of handling of tcp SMB length */
+ memcpy(tmp,ptr,4);
+ set_message(ptr,17,17 + len,True);
+ memcpy(ptr,tmp,4);
+
+ CVAL(ptr,smb_com) = SMBtrans;
+ SSVAL(ptr,smb_vwv1,len);
+ SSVAL(ptr,smb_vwv11,len);
+ SSVAL(ptr,smb_vwv12,70 + strlen(mailslot));
+ SSVAL(ptr,smb_vwv13,3);
+ SSVAL(ptr,smb_vwv14,1);
+ SSVAL(ptr,smb_vwv15,1);
+ SSVAL(ptr,smb_vwv16,2);
+ p2 = smb_buf(ptr);
+ strcpy(p2,mailslot);
+ p2 = skip_string(p2,1);
+
+ memcpy(p2,buf,len);
+ p2 += len;
+
+ dgram->datasize = PTR_DIFF(p2,ptr+4); /* +4 for tcp length */
+
+ p.ip = dest_ip;
+ p.port = DGRAM_PORT;
+ p.fd = fd;
+ p.timestamp = time(NULL);
+ p.packet_type = DGRAM_PACKET;
+
+ return(send_packet(&p));
+}
+
+
generated by cgit (git 2.34.1) at 2024-12-17 04:47:53 +0000