2 Unix SMB/Netbios implementation.
4 NBT netbios library routines
5 Copyright (C) Andrew Tridgell 1994-1998
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 extern int DEBUGLEVEL;
27 int num_good_sends = 0;
28 int num_good_receives = 0;
30 static struct opcode_names {
31 char *nmb_opcode_name;
33 } nmb_header_opcode_names[] = {
39 {"Refresh(altcode)", 9 },
40 {"Multi-homed Registration", 15 },
44 /****************************************************************************
45 * Lookup a nmb opcode name.
46 ****************************************************************************/
47 static char *lookup_opcode_name( int opcode )
49 struct opcode_names *op_namep;
52 for(i = 0; nmb_header_opcode_names[i].nmb_opcode_name != 0; i++) {
53 op_namep = &nmb_header_opcode_names[i];
54 if(opcode == op_namep->opcode)
55 return op_namep->nmb_opcode_name;
57 return "<unknown opcode>";
60 /****************************************************************************
61 print out a res_rec structure
62 ****************************************************************************/
63 static void debug_nmb_res_rec(struct res_rec *res, char *hdr)
67 DEBUGADD( 4, ( " %s: nmb_name=%s rr_type=%d rr_class=%d ttl=%d\n",
69 nmb_namestr(&res->rr_name),
74 if( res->rdlength == 0 || res->rdata == NULL )
77 for (i = 0; i < res->rdlength; i+= 16)
79 DEBUGADD(4, (" %s %3x char ", hdr, i));
81 for (j = 0; j < 16; j++)
83 uchar x = res->rdata[i+j];
84 if (x < 32 || x > 127) x = '.';
86 if (i+j >= res->rdlength) break;
87 DEBUGADD(4, ("%c", x));
90 DEBUGADD(4, (" hex "));
92 for (j = 0; j < 16; j++)
94 if (i+j >= res->rdlength) break;
95 DEBUGADD(4, ("%02X", (uchar)res->rdata[i+j]));
102 /****************************************************************************
104 ****************************************************************************/
105 void debug_nmb_packet(struct packet_struct *p)
107 struct nmb_packet *nmb = &p->packet.nmb;
111 dbgtext( "nmb packet from %s(%d) header: id=%d opcode=%s(%d) response=%s\n",
112 inet_ntoa(p->ip), p->port,
113 nmb->header.name_trn_id,
114 lookup_opcode_name(nmb->header.opcode),
116 BOOLSTR(nmb->header.response) );
117 dbgtext( " header: flags: bcast=%s rec_avail=%s rec_des=%s trunc=%s auth=%s\n",
118 BOOLSTR(nmb->header.nm_flags.bcast),
119 BOOLSTR(nmb->header.nm_flags.recursion_available),
120 BOOLSTR(nmb->header.nm_flags.recursion_desired),
121 BOOLSTR(nmb->header.nm_flags.trunc),
122 BOOLSTR(nmb->header.nm_flags.authoritative) );
123 dbgtext( " header: rcode=%d qdcount=%d ancount=%d nscount=%d arcount=%d\n",
128 nmb->header.arcount );
131 if (nmb->header.qdcount)
133 DEBUGADD( 4, ( " question: q_name=%s q_type=%d q_class=%d\n",
134 nmb_namestr(&nmb->question.question_name),
135 nmb->question.question_type,
136 nmb->question.question_class) );
139 if (nmb->answers && nmb->header.ancount)
141 debug_nmb_res_rec(nmb->answers,"answers");
143 if (nmb->nsrecs && nmb->header.nscount)
145 debug_nmb_res_rec(nmb->nsrecs,"nsrecs");
147 if (nmb->additional && nmb->header.arcount)
149 debug_nmb_res_rec(nmb->additional,"additional");
153 /*******************************************************************
154 handle "compressed" name pointers
155 ******************************************************************/
156 static BOOL handle_name_ptrs(uchar *ubuf,int *offset,int length,
157 BOOL *got_pointer,int *ret)
161 while ((ubuf[*offset] & 0xC0) == 0xC0) {
162 if (!*got_pointer) (*ret) += 2;
164 (*offset) = ((ubuf[*offset] & ~0xC0)<<8) | ubuf[(*offset)+1];
165 if (loop_count++ == 10 || (*offset) < 0 || (*offset)>(length-2)) {
172 /*******************************************************************
173 parse a nmb name from "compressed" format to something readable
174 return the space taken by the name, or 0 if the name is invalid
175 ******************************************************************/
176 static int parse_nmb_name(char *inbuf,int offset,int length, struct nmb_name *name)
179 uchar *ubuf = (uchar *)inbuf;
181 BOOL got_pointer=False;
184 if (length - offset < 2)
187 /* handle initial name pointers */
188 if (!handle_name_ptrs(ubuf,&offset,length,&got_pointer,&ret))
195 if ((m & 0xC0) || offset+m+2 > length)
198 memset((char *)name,'\0',sizeof(*name));
200 /* the "compressed" part */
206 c1 = ubuf[offset++]-'A';
207 c2 = ubuf[offset++]-'A';
208 if ((c1 & 0xF0) || (c2 & 0xF0) || (n > sizeof(name->name)-1))
210 name->name[n++] = (c1<<4) | c2;
216 /* parse out the name type,
217 its always in the 16th byte of the name */
218 name->name_type = ((uchar)name->name[15]) & 0xff;
220 /* remove trailing spaces */
223 while (n && name->name[n]==' ')
227 /* now the domain parts (if any) */
229 while (ubuf[offset]) {
230 /* we can have pointers within the domain part as well */
231 if (!handle_name_ptrs(ubuf,&offset,length,&got_pointer,&ret))
236 * Don't allow null domain parts.
243 name->scope[n++] = '.';
244 if (m+2+offset>length || n+m+1>sizeof(name->scope))
248 name->scope[n++] = (char)ubuf[offset++];
251 * Watch for malicious loops.
253 if (loop_count++ == 10)
256 name->scope[n++] = 0;
262 /*******************************************************************
263 put a compressed nmb name into a buffer. return the length of the
266 compressed names are really weird. The "compression" doubles the
267 size. The idea is that it also means that compressed names conform
268 to the doman name system. See RFC1002.
269 ******************************************************************/
270 static int put_nmb_name(char *buf,int offset,struct nmb_name *name)
276 if (strcmp(name->name,"*") == 0) {
277 /* special case for wildcard name */
278 memset(buf1,'\0',20);
280 buf1[15] = name->name_type;
282 slprintf(buf1, sizeof(buf1) - 1,"%-15.15s%c",name->name,name->name_type);
290 buf[offset+1+2*m] = 'A' + ((buf1[m]>>4)&0xF);
291 buf[offset+2+2*m] = 'A' + (buf1[m]&0xF);
297 if (name->scope[0]) {
298 /* XXXX this scope handling needs testing */
299 ret += strlen(name->scope) + 1;
300 pstrcpy(&buf[offset+1],name->scope);
303 while ((p = strchr(p,'.'))) {
304 buf[offset] = PTR_DIFF(p,&buf[offset+1]);
305 offset += (buf[offset] + 1);
308 buf[offset] = strlen(&buf[offset+1]);
314 /*******************************************************************
315 useful for debugging messages
316 ******************************************************************/
317 char *nmb_namestr(struct nmb_name *n)
320 static fstring ret[4];
324 slprintf(p,sizeof(fstring)-1, "%s<%02x>",n->name,n->name_type);
326 slprintf(p,sizeof(fstring)-1, "%s<%02x>.%s",n->name,n->name_type,n->scope);
332 /*******************************************************************
333 allocate and parse some resource records
334 ******************************************************************/
335 static BOOL parse_alloc_res_rec(char *inbuf,int *offset,int length,
336 struct res_rec **recs, int count)
339 *recs = (struct res_rec *)malloc(sizeof(**recs)*count);
340 if (!*recs) return(False);
342 memset((char *)*recs,'\0',sizeof(**recs)*count);
344 for (i=0;i<count;i++) {
345 int l = parse_nmb_name(inbuf,*offset,length,&(*recs)[i].rr_name);
347 if (!l || (*offset)+10 > length) {
352 (*recs)[i].rr_type = RSVAL(inbuf,(*offset));
353 (*recs)[i].rr_class = RSVAL(inbuf,(*offset)+2);
354 (*recs)[i].ttl = RIVAL(inbuf,(*offset)+4);
355 (*recs)[i].rdlength = RSVAL(inbuf,(*offset)+8);
357 if ((*recs)[i].rdlength>sizeof((*recs)[i].rdata) ||
358 (*offset)+(*recs)[i].rdlength > length) {
363 memcpy((*recs)[i].rdata,inbuf+(*offset),(*recs)[i].rdlength);
364 (*offset) += (*recs)[i].rdlength;
369 /*******************************************************************
370 put a resource record into a packet
371 ******************************************************************/
372 static int put_res_rec(char *buf,int offset,struct res_rec *recs,int count)
377 for (i=0;i<count;i++) {
378 int l = put_nmb_name(buf,offset,&recs[i].rr_name);
381 RSSVAL(buf,offset,recs[i].rr_type);
382 RSSVAL(buf,offset+2,recs[i].rr_class);
383 RSIVAL(buf,offset+4,recs[i].ttl);
384 RSSVAL(buf,offset+8,recs[i].rdlength);
385 memcpy(buf+offset+10,recs[i].rdata,recs[i].rdlength);
386 offset += 10+recs[i].rdlength;
387 ret += 10+recs[i].rdlength;
393 /*******************************************************************
394 put a compressed name pointer record into a packet
395 ******************************************************************/
396 static int put_compressed_name_ptr(uchar *buf,int offset,struct res_rec *rec,int ptr_offset)
399 buf[offset] = (0xC0 | ((ptr_offset >> 8) & 0xFF));
400 buf[offset+1] = (ptr_offset & 0xFF);
403 RSSVAL(buf,offset,rec->rr_type);
404 RSSVAL(buf,offset+2,rec->rr_class);
405 RSIVAL(buf,offset+4,rec->ttl);
406 RSSVAL(buf,offset+8,rec->rdlength);
407 memcpy(buf+offset+10,rec->rdata,rec->rdlength);
408 offset += 10+rec->rdlength;
409 ret += 10+rec->rdlength;
414 /*******************************************************************
415 parse a dgram packet. Return False if the packet can't be parsed
416 or is invalid for some reason, True otherwise
418 this is documented in section 4.4.1 of RFC1002
419 ******************************************************************/
420 static BOOL parse_dgram(char *inbuf,int length,struct dgram_packet *dgram)
425 memset((char *)dgram,'\0',sizeof(*dgram));
427 if (length < 14) return(False);
429 dgram->header.msg_type = CVAL(inbuf,0);
430 flags = CVAL(inbuf,1);
431 dgram->header.flags.node_type = (enum node_type)((flags>>2)&3);
432 if (flags & 1) dgram->header.flags.more = True;
433 if (flags & 2) dgram->header.flags.first = True;
434 dgram->header.dgm_id = RSVAL(inbuf,2);
435 putip((char *)&dgram->header.source_ip,inbuf+4);
436 dgram->header.source_port = RSVAL(inbuf,8);
437 dgram->header.dgm_length = RSVAL(inbuf,10);
438 dgram->header.packet_offset = RSVAL(inbuf,12);
442 if (dgram->header.msg_type == 0x10 ||
443 dgram->header.msg_type == 0x11 ||
444 dgram->header.msg_type == 0x12) {
445 offset += parse_nmb_name(inbuf,offset,length,&dgram->source_name);
446 offset += parse_nmb_name(inbuf,offset,length,&dgram->dest_name);
449 if (offset >= length || (length-offset > sizeof(dgram->data)))
452 dgram->datasize = length-offset;
453 memcpy(dgram->data,inbuf+offset,dgram->datasize);
459 /*******************************************************************
460 parse a nmb packet. Return False if the packet can't be parsed
461 or is invalid for some reason, True otherwise
462 ******************************************************************/
463 static BOOL parse_nmb(char *inbuf,int length,struct nmb_packet *nmb)
467 memset((char *)nmb,'\0',sizeof(*nmb));
469 if (length < 12) return(False);
471 /* parse the header */
472 nmb->header.name_trn_id = RSVAL(inbuf,0);
474 DEBUG(10,("parse_nmb: packet id = %d\n", nmb->header.name_trn_id));
476 nmb->header.opcode = (CVAL(inbuf,2) >> 3) & 0xF;
477 nmb->header.response = ((CVAL(inbuf,2)>>7)&1)?True:False;
478 nm_flags = ((CVAL(inbuf,2) & 0x7) << 4) + (CVAL(inbuf,3)>>4);
479 nmb->header.nm_flags.bcast = (nm_flags&1)?True:False;
480 nmb->header.nm_flags.recursion_available = (nm_flags&8)?True:False;
481 nmb->header.nm_flags.recursion_desired = (nm_flags&0x10)?True:False;
482 nmb->header.nm_flags.trunc = (nm_flags&0x20)?True:False;
483 nmb->header.nm_flags.authoritative = (nm_flags&0x40)?True:False;
484 nmb->header.rcode = CVAL(inbuf,3) & 0xF;
485 nmb->header.qdcount = RSVAL(inbuf,4);
486 nmb->header.ancount = RSVAL(inbuf,6);
487 nmb->header.nscount = RSVAL(inbuf,8);
488 nmb->header.arcount = RSVAL(inbuf,10);
490 if (nmb->header.qdcount) {
491 offset = parse_nmb_name(inbuf,12,length,&nmb->question.question_name);
492 if (!offset) return(False);
494 if (length - (12+offset) < 4) return(False);
495 nmb->question.question_type = RSVAL(inbuf,12+offset);
496 nmb->question.question_class = RSVAL(inbuf,12+offset+2);
503 /* and any resource records */
504 if (nmb->header.ancount &&
505 !parse_alloc_res_rec(inbuf,&offset,length,&nmb->answers,
506 nmb->header.ancount))
509 if (nmb->header.nscount &&
510 !parse_alloc_res_rec(inbuf,&offset,length,&nmb->nsrecs,
511 nmb->header.nscount))
514 if (nmb->header.arcount &&
515 !parse_alloc_res_rec(inbuf,&offset,length,&nmb->additional,
516 nmb->header.arcount))
522 /*******************************************************************
523 'Copy constructor' for an nmb packet
524 ******************************************************************/
525 static struct packet_struct *copy_nmb_packet(struct packet_struct *packet)
527 struct nmb_packet *nmb;
528 struct nmb_packet *copy_nmb;
529 struct packet_struct *pkt_copy;
531 if(( pkt_copy = (struct packet_struct *)malloc(sizeof(*packet))) == NULL)
533 DEBUG(0,("copy_nmb_packet: malloc fail.\n"));
537 /* Structure copy of entire thing. */
541 /* Ensure this copy is not locked. */
542 pkt_copy->locked = False;
544 /* Ensure this copy has no resource records. */
545 nmb = &packet->packet.nmb;
546 copy_nmb = &pkt_copy->packet.nmb;
548 copy_nmb->answers = NULL;
549 copy_nmb->nsrecs = NULL;
550 copy_nmb->additional = NULL;
552 /* Now copy any resource records. */
556 if((copy_nmb->answers = (struct res_rec *)
557 malloc(nmb->header.ancount * sizeof(struct res_rec))) == NULL)
559 memcpy((char *)copy_nmb->answers, (char *)nmb->answers,
560 nmb->header.ancount * sizeof(struct res_rec));
564 if((copy_nmb->nsrecs = (struct res_rec *)
565 malloc(nmb->header.nscount * sizeof(struct res_rec))) == NULL)
567 memcpy((char *)copy_nmb->nsrecs, (char *)nmb->nsrecs,
568 nmb->header.nscount * sizeof(struct res_rec));
572 if((copy_nmb->additional = (struct res_rec *)
573 malloc(nmb->header.arcount * sizeof(struct res_rec))) == NULL)
575 memcpy((char *)copy_nmb->additional, (char *)nmb->additional,
576 nmb->header.arcount * sizeof(struct res_rec));
583 if(copy_nmb->answers) {
584 free((char *)copy_nmb->answers);
585 copy_nmb->answers = NULL;
587 if(copy_nmb->nsrecs) {
588 free((char *)copy_nmb->nsrecs);
589 copy_nmb->nsrecs = NULL;
591 if(copy_nmb->additional) {
592 free((char *)copy_nmb->additional);
593 copy_nmb->additional = NULL;
595 free((char *)pkt_copy);
597 DEBUG(0,("copy_nmb_packet: malloc fail in resource records.\n"));
601 /*******************************************************************
602 'Copy constructor' for a dgram packet
603 ******************************************************************/
604 static struct packet_struct *copy_dgram_packet(struct packet_struct *packet)
606 struct packet_struct *pkt_copy;
608 if(( pkt_copy = (struct packet_struct *)malloc(sizeof(*packet))) == NULL)
610 DEBUG(0,("copy_dgram_packet: malloc fail.\n"));
614 /* Structure copy of entire thing. */
618 /* Ensure this copy is not locked. */
619 pkt_copy->locked = False;
621 /* There are no additional pointers in a dgram packet,
626 /*******************************************************************
627 'Copy constructor' for a generic packet
628 ******************************************************************/
629 struct packet_struct *copy_packet(struct packet_struct *packet)
631 if(packet->packet_type == NMB_PACKET)
632 return copy_nmb_packet(packet);
633 else if (packet->packet_type == DGRAM_PACKET)
634 return copy_dgram_packet(packet);
638 /*******************************************************************
639 free up any resources associated with an nmb packet
640 ******************************************************************/
641 static void free_nmb_packet(struct nmb_packet *nmb)
651 if (nmb->additional) {
652 free(nmb->additional);
653 nmb->additional = NULL;
657 /*******************************************************************
658 free up any resources associated with a dgram packet
659 ******************************************************************/
660 static void free_dgram_packet(struct dgram_packet *nmb)
662 /* We have nothing to do for a dgram packet. */
665 /*******************************************************************
666 free up any resources associated with a packet
667 ******************************************************************/
668 void free_packet(struct packet_struct *packet)
672 if (packet->packet_type == NMB_PACKET)
673 free_nmb_packet(&packet->packet.nmb);
674 else if (packet->packet_type == DGRAM_PACKET)
675 free_dgram_packet(&packet->packet.dgram);
676 ZERO_STRUCTPN(packet);
680 /*******************************************************************
681 parse a packet buffer into a packet structure
682 ******************************************************************/
683 struct packet_struct *parse_packet(char *buf,int length,
684 enum packet_type packet_type)
686 extern struct in_addr lastip;
688 struct packet_struct *p;
691 p = (struct packet_struct *)malloc(sizeof(*p));
692 if (!p) return(NULL);
699 p->timestamp = time(NULL);
700 p->packet_type = packet_type;
702 switch (packet_type) {
704 ok = parse_nmb(buf,length,&p->packet.nmb);
708 ok = parse_dgram(buf,length,&p->packet.dgram);
720 /*******************************************************************
721 read a packet from a socket and parse it, returning a packet ready
722 to be used or put on the queue. This assumes a UDP socket
723 ******************************************************************/
724 struct packet_struct *read_packet(int fd,enum packet_type packet_type)
726 struct packet_struct *packet;
727 char buf[MAX_DGRAM_SIZE];
730 length = read_udp_socket(fd,buf,sizeof(buf));
731 if (length < MIN_DGRAM_SIZE) return(NULL);
733 packet = parse_packet(buf, length, packet_type);
734 if (!packet) return NULL;
740 DEBUG(5,("Received a packet of len %d from (%s) port %d\n",
741 length, inet_ntoa(packet->ip), packet->port ) );
747 /*******************************************************************
748 send a udp packet on a already open socket
749 ******************************************************************/
750 static BOOL send_udp(int fd,char *buf,int len,struct in_addr ip,int port)
754 struct sockaddr_in sock_out;
756 /* set the address and port */
757 memset((char *)&sock_out,'\0',sizeof(sock_out));
758 putip((char *)&sock_out.sin_addr,(char *)&ip);
759 sock_out.sin_port = htons( port );
760 sock_out.sin_family = AF_INET;
762 DEBUG( 5, ( "Sending a packet of len %d to (%s) on port %d\n",
763 len, inet_ntoa(ip), port ) );
766 * Patch to fix asynch error notifications from Linux kernel.
769 for (i = 0; i < 5; i++) {
770 ret = (sendto(fd,buf,len,0,(struct sockaddr *)&sock_out, sizeof(sock_out)) >= 0);
771 if (ret || errno != ECONNREFUSED)
776 DEBUG(0,("Packet send failed to %s(%d) ERRNO=%s\n",
777 inet_ntoa(ip),port,strerror(errno)));
785 /*******************************************************************
786 build a dgram packet ready for sending
788 XXXX This currently doesn't handle packets too big for one
789 datagram. It should split them and use the packet_offset, more and
790 first flags to handle the fragmentation. Yuck.
791 ******************************************************************/
792 static int build_dgram(char *buf,struct packet_struct *p)
794 struct dgram_packet *dgram = &p->packet.dgram;
795 uchar *ubuf = (uchar *)buf;
798 /* put in the header */
799 ubuf[0] = dgram->header.msg_type;
800 ubuf[1] = (((int)dgram->header.flags.node_type)<<2);
801 if (dgram->header.flags.more) ubuf[1] |= 1;
802 if (dgram->header.flags.first) ubuf[1] |= 2;
803 RSSVAL(ubuf,2,dgram->header.dgm_id);
804 putip(ubuf+4,(char *)&dgram->header.source_ip);
805 RSSVAL(ubuf,8,dgram->header.source_port);
806 RSSVAL(ubuf,12,dgram->header.packet_offset);
810 if (dgram->header.msg_type == 0x10 ||
811 dgram->header.msg_type == 0x11 ||
812 dgram->header.msg_type == 0x12) {
813 offset += put_nmb_name((char *)ubuf,offset,&dgram->source_name);
814 offset += put_nmb_name((char *)ubuf,offset,&dgram->dest_name);
817 memcpy(ubuf+offset,dgram->data,dgram->datasize);
818 offset += dgram->datasize;
820 /* automatically set the dgm_length */
821 dgram->header.dgm_length = offset;
822 RSSVAL(ubuf,10,dgram->header.dgm_length);
827 /*******************************************************************
829 *******************************************************************/
830 void make_nmb_name( struct nmb_name *n, const char *name, int type)
832 extern pstring global_scope;
833 memset( (char *)n, '\0', sizeof(struct nmb_name) );
834 push_ascii(n->name, name, 15, STR_TERMINATE|STR_UPPER);
835 n->name_type = (unsigned int)type & 0xFF;
836 StrnCpy( n->scope, global_scope, 63 );
837 strupper( n->scope );
840 /*******************************************************************
841 Compare two nmb names
842 ******************************************************************/
844 BOOL nmb_name_equal(struct nmb_name *n1, struct nmb_name *n2)
846 return ((n1->name_type == n2->name_type) &&
847 strequal(n1->name ,n2->name ) &&
848 strequal(n1->scope,n2->scope));
851 /*******************************************************************
852 build a nmb packet ready for sending
854 XXXX this currently relies on not being passed something that expands
855 to a packet too big for the buffer. Eventually this should be
856 changed to set the trunc bit so the receiver can request the rest
857 via tcp (when that becomes supported)
858 ******************************************************************/
859 static int build_nmb(char *buf,struct packet_struct *p)
861 struct nmb_packet *nmb = &p->packet.nmb;
862 uchar *ubuf = (uchar *)buf;
865 /* put in the header */
866 RSSVAL(ubuf,offset,nmb->header.name_trn_id);
867 ubuf[offset+2] = (nmb->header.opcode & 0xF) << 3;
868 if (nmb->header.response) ubuf[offset+2] |= (1<<7);
869 if (nmb->header.nm_flags.authoritative &&
870 nmb->header.response) ubuf[offset+2] |= 0x4;
871 if (nmb->header.nm_flags.trunc) ubuf[offset+2] |= 0x2;
872 if (nmb->header.nm_flags.recursion_desired) ubuf[offset+2] |= 0x1;
873 if (nmb->header.nm_flags.recursion_available &&
874 nmb->header.response) ubuf[offset+3] |= 0x80;
875 if (nmb->header.nm_flags.bcast) ubuf[offset+3] |= 0x10;
876 ubuf[offset+3] |= (nmb->header.rcode & 0xF);
878 RSSVAL(ubuf,offset+4,nmb->header.qdcount);
879 RSSVAL(ubuf,offset+6,nmb->header.ancount);
880 RSSVAL(ubuf,offset+8,nmb->header.nscount);
881 RSSVAL(ubuf,offset+10,nmb->header.arcount);
884 if (nmb->header.qdcount) {
885 /* XXXX this doesn't handle a qdcount of > 1 */
886 offset += put_nmb_name((char *)ubuf,offset,&nmb->question.question_name);
887 RSSVAL(ubuf,offset,nmb->question.question_type);
888 RSSVAL(ubuf,offset+2,nmb->question.question_class);
892 if (nmb->header.ancount)
893 offset += put_res_rec((char *)ubuf,offset,nmb->answers,
894 nmb->header.ancount);
896 if (nmb->header.nscount)
897 offset += put_res_rec((char *)ubuf,offset,nmb->nsrecs,
898 nmb->header.nscount);
901 * The spec says we must put compressed name pointers
902 * in the following outgoing packets :
903 * NAME_REGISTRATION_REQUEST, NAME_REFRESH_REQUEST,
904 * NAME_RELEASE_REQUEST.
907 if((nmb->header.response == False) &&
908 ((nmb->header.opcode == NMB_NAME_REG_OPCODE) ||
909 (nmb->header.opcode == NMB_NAME_RELEASE_OPCODE) ||
910 (nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_8) ||
911 (nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_9) ||
912 (nmb->header.opcode == NMB_NAME_MULTIHOMED_REG_OPCODE)) &&
913 (nmb->header.arcount == 1)) {
915 offset += put_compressed_name_ptr(ubuf,offset,nmb->additional,12);
917 } else if (nmb->header.arcount) {
918 offset += put_res_rec((char *)ubuf,offset,nmb->additional,
919 nmb->header.arcount);
925 /*******************************************************************
927 ******************************************************************/
928 int build_packet(char *buf, struct packet_struct *p)
932 switch (p->packet_type) {
934 len = build_nmb(buf,p);
938 len = build_dgram(buf,p);
945 /*******************************************************************
947 ******************************************************************/
948 BOOL send_packet(struct packet_struct *p)
953 memset(buf,'\0',sizeof(buf));
955 len = build_packet(buf, p);
957 if (!len) return(False);
959 return(send_udp(p->fd,buf,len,p->ip,p->port));
962 /****************************************************************************
963 receive a packet with timeout on a open UDP filedescriptor
964 The timeout is in milliseconds
965 ***************************************************************************/
966 struct packet_struct *receive_packet(int fd,enum packet_type type,int t)
969 struct timeval timeout;
974 timeout.tv_sec = t/1000;
975 timeout.tv_usec = 1000*(t%1000);
977 if ((ret = sys_select_intr(fd+1,&fds,&timeout)) == -1) {
978 /* errno should be EBADF or EINVAL. */
979 DEBUG(0,("select returned -1, errno = %s (%d)\n", strerror(errno), errno));
983 if (ret == 0) /* timeout */
986 if (FD_ISSET(fd,&fds))
987 return(read_packet(fd,type));
993 /****************************************************************************
994 receive a UDP/137 packet either via UDP or from the unexpected packet
995 queue. The packet must be a reply packet and have the specified trn_id
996 The timeout is in milliseconds
997 ***************************************************************************/
998 struct packet_struct *receive_nmb_packet(int fd, int t, int trn_id)
1000 struct packet_struct *p;
1002 p = receive_packet(fd, NMB_PACKET, t);
1004 if (p && p->packet.nmb.header.response &&
1005 p->packet.nmb.header.name_trn_id == trn_id) {
1008 if (p) free_packet(p);
1010 /* try the unexpected packet queue */
1011 return receive_unexpected(NMB_PACKET, trn_id, NULL);
1014 /****************************************************************************
1015 receive a UDP/138 packet either via UDP or from the unexpected packet
1016 queue. The packet must be a reply packet and have the specified mailslot name
1017 The timeout is in milliseconds
1018 ***************************************************************************/
1019 struct packet_struct *receive_dgram_packet(int fd, int t, char *mailslot_name)
1021 struct packet_struct *p;
1023 p = receive_packet(fd, DGRAM_PACKET, t);
1025 if (p && match_mailslot_name(p, mailslot_name)) {
1028 if (p) free_packet(p);
1030 /* try the unexpected packet queue */
1031 return receive_unexpected(DGRAM_PACKET, 0, mailslot_name);
1035 /****************************************************************************
1036 see if a datagram has the right mailslot name
1037 ***************************************************************************/
1038 BOOL match_mailslot_name(struct packet_struct *p, char *mailslot_name)
1040 struct dgram_packet *dgram = &p->packet.dgram;
1043 buf = &dgram->data[0];
1048 if (memcmp(buf, mailslot_name, strlen(mailslot_name)+1) == 0) {
1056 /****************************************************************************
1057 return the number of bits that match between two 4 character buffers
1058 ***************************************************************************/
1059 static int matching_bits(uchar *p1, uchar *p2)
1062 for (i=0; i<4; i++) {
1063 if (p1[i] != p2[i]) break;
1067 if (i==4) return ret;
1069 for (j=0; j<8; j++) {
1070 if ((p1[i] & (1<<(7-j))) != (p2[i] & (1<<(7-j)))) break;
1078 static uchar sort_ip[4];
1080 /****************************************************************************
1081 compare two query reply records
1082 ***************************************************************************/
1083 static int name_query_comp(uchar *p1, uchar *p2)
1085 return matching_bits(p2+2, sort_ip) - matching_bits(p1+2, sort_ip);
1088 /****************************************************************************
1089 sort a set of 6 byte name query response records so that the IPs that
1090 have the most leading bits in common with the specified address come first
1091 ***************************************************************************/
1092 void sort_query_replies(char *data, int n, struct in_addr ip)
1096 putip(sort_ip, (char *)&ip);
1098 qsort(data, n, 6, QSORT_CAST name_query_comp);
1102 #define TRUNCATE_NETBIOS_NAME 1
1104 /*******************************************************************
1105 convert, possibly using a stupid microsoft-ism which has destroyed
1106 the transport independence of netbios (for CIFS vendors that usually
1107 use the Win95-type methods, not for NT to NT communication, which uses
1108 DCE/RPC and therefore full-length unicode strings...) a dns name into
1111 the netbios name (NOT necessarily null-terminated) is truncated to 15
1114 ******************************************************************/
1115 char *dns_to_netbios_name(char *dns_name)
1117 static char netbios_name[16];
1119 StrnCpy(netbios_name, dns_name, 15);
1120 netbios_name[15] = 0;
1122 #ifdef TRUNCATE_NETBIOS_NAME
1123 /* ok. this is because of a stupid microsoft-ism. if the called host
1124 name contains a '.', microsoft clients expect you to truncate the
1125 netbios name up to and including the '.' this even applies, by
1126 mistake, to workgroup (domain) names, which is _really_ daft.
1128 for (i = 15; i >= 0; i--)
1130 if (netbios_name[i] == '.')
1132 netbios_name[i] = 0;
1136 #endif /* TRUNCATE_NETBIOS_NAME */
1138 return netbios_name;
1142 /****************************************************************************
1143 interpret the weird netbios "name". Return the name type
1144 ****************************************************************************/
1145 static int name_interpret(char *in,char *out)
1148 int len = (*in++) / 2;
1152 if (len > 30 || len<1) return(0);
1156 if (in[0] < 'A' || in[0] > 'P' || in[1] < 'A' || in[1] > 'P') {
1160 *out = ((in[0]-'A')<<4) + (in[1]-'A');
1167 #ifdef NETBIOS_SCOPE
1168 /* Handle any scope names */
1171 *out++ = '.'; /* Scope names are separated by periods */
1172 len = *(uchar *)in++;
1173 StrnCpy(out, in, len);
1182 /****************************************************************************
1183 mangle a name into netbios format
1185 Note: <Out> must be (33 + strlen(scope) + 2) bytes long, at minimum.
1186 ****************************************************************************/
1187 int name_mangle( char *In, char *Out, char name_type )
1194 extern pstring global_scope;
1196 /* Safely copy the input string, In, into buf[]. */
1197 (void)memset( buf, 0, 20 );
1198 if (strcmp(In,"*") == 0)
1201 (void)slprintf( buf, sizeof(buf) - 1, "%-15.15s%c", In, name_type );
1203 /* Place the length of the first field into the output buffer. */
1207 /* Now convert the name to the rfc1001/1002 format. */
1208 for( i = 0; i < 16; i++ )
1210 c = toupper( buf[i] );
1211 p[i*2] = ( (c >> 4) & 0x000F ) + 'A';
1212 p[(i*2)+1] = (c & 0x000F) + 'A';
1217 /* Add the scope string. */
1218 for( i = 0, len = 0; NULL != global_scope; i++, len++ )
1220 switch( global_scope[i] )
1226 return( name_len(Out) );
1233 p[len+1] = global_scope[i];
1238 return( name_len(Out) );
1242 /****************************************************************************
1243 find a pointer to a netbios name
1244 ****************************************************************************/
1245 static char *name_ptr(char *buf,int ofs)
1247 uchar c = *(uchar *)(buf+ofs);
1249 if ((c & 0xC0) == 0xC0)
1251 uint16 l = RSVAL(buf, ofs) & 0x3FFF;
1252 DEBUG(5,("name ptr to pos %d from %d is %s\n",l,ofs,buf+l));
1259 /****************************************************************************
1260 extract a netbios name from a buf
1261 ****************************************************************************/
1262 int name_extract(char *buf,int ofs,char *name)
1264 char *p = name_ptr(buf,ofs);
1265 int d = PTR_DIFF(p,buf+ofs);
1267 if (d < -50 || d > 50) return(0);
1268 return(name_interpret(p,name));
1271 /****************************************************************************
1272 return the total storage length of a mangled name
1273 ****************************************************************************/
1274 int name_len(char *s1)
1276 /* NOTE: this argument _must_ be unsigned */
1277 uchar *s = (uchar *)s1;
1280 /* If the two high bits of the byte are set, return 2. */
1281 if (0xC0 == (*s & 0xC0))
1284 /* Add up the length bytes. */
1285 for (len = 1; (*s); s += (*s) + 1) {
1287 SMB_ASSERT(len < 80);