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 unsigned char 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", (unsigned char)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(unsigned char *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 unsigned char *ubuf = (unsigned char *)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 = ((unsigned char)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]);
305 offset += buf[offset];
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(unsigned char *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 read a packet from a socket and parse it, returning a packet ready
682 to be used or put on the queue. This assumes a UDP socket
683 ******************************************************************/
684 struct packet_struct *read_packet(int fd,enum packet_type packet_type)
686 extern struct in_addr lastip;
688 struct packet_struct *packet;
689 char buf[MAX_DGRAM_SIZE];
693 length = read_udp_socket(fd,buf,sizeof(buf));
694 if (length < MIN_DGRAM_SIZE) return(NULL);
696 packet = (struct packet_struct *)malloc(sizeof(*packet));
697 if (!packet) return(NULL);
702 packet->port = lastport;
704 packet->locked = False;
705 packet->timestamp = time(NULL);
706 packet->packet_type = packet_type;
710 ok = parse_nmb(buf,length,&packet->packet.nmb);
714 ok = parse_dgram(buf,length,&packet->packet.dgram);
718 DEBUG(10,("read_packet: discarding packet id = %d\n",
719 packet->packet.nmb.header.name_trn_id));
726 DEBUG(5,("Received a packet of len %d from (%s) port %d\n",
727 length, inet_ntoa(packet->ip), packet->port ) );
733 /*******************************************************************
734 send a udp packet on a already open socket
735 ******************************************************************/
736 static BOOL send_udp(int fd,char *buf,int len,struct in_addr ip,int port)
739 struct sockaddr_in sock_out;
741 /* set the address and port */
742 memset((char *)&sock_out,'\0',sizeof(sock_out));
743 putip((char *)&sock_out.sin_addr,(char *)&ip);
744 sock_out.sin_port = htons( port );
745 sock_out.sin_family = AF_INET;
747 DEBUG( 5, ( "Sending a packet of len %d to (%s) on port %d\n",
748 len, inet_ntoa(ip), port ) );
750 ret = (sendto(fd,buf,len,0,(struct sockaddr *)&sock_out,
751 sizeof(sock_out)) >= 0);
754 DEBUG(0,("Packet send failed to %s(%d) ERRNO=%s\n",
755 inet_ntoa(ip),port,strerror(errno)));
763 /*******************************************************************
764 build a dgram packet ready for sending
766 XXXX This currently doesn't handle packets too big for one
767 datagram. It should split them and use the packet_offset, more and
768 first flags to handle the fragmentation. Yuck.
769 ******************************************************************/
770 static int build_dgram(char *buf,struct packet_struct *p)
772 struct dgram_packet *dgram = &p->packet.dgram;
773 unsigned char *ubuf = (unsigned char *)buf;
776 /* put in the header */
777 ubuf[0] = dgram->header.msg_type;
778 ubuf[1] = (((int)dgram->header.flags.node_type)<<2);
779 if (dgram->header.flags.more) ubuf[1] |= 1;
780 if (dgram->header.flags.first) ubuf[1] |= 2;
781 RSSVAL(ubuf,2,dgram->header.dgm_id);
782 putip(ubuf+4,(char *)&dgram->header.source_ip);
783 RSSVAL(ubuf,8,dgram->header.source_port);
784 RSSVAL(ubuf,12,dgram->header.packet_offset);
788 if (dgram->header.msg_type == 0x10 ||
789 dgram->header.msg_type == 0x11 ||
790 dgram->header.msg_type == 0x12) {
791 offset += put_nmb_name((char *)ubuf,offset,&dgram->source_name);
792 offset += put_nmb_name((char *)ubuf,offset,&dgram->dest_name);
795 memcpy(ubuf+offset,dgram->data,dgram->datasize);
796 offset += dgram->datasize;
798 /* automatically set the dgm_length */
799 dgram->header.dgm_length = offset;
800 RSSVAL(ubuf,10,dgram->header.dgm_length);
805 /*******************************************************************
807 *******************************************************************/
808 void make_nmb_name( struct nmb_name *n, const char *name, int type, const char *this_scope )
810 memset( (char *)n, '\0', sizeof(struct nmb_name) );
811 StrnCpy( n->name, name, 15 );
813 n->name_type = (unsigned int)type & 0xFF;
814 StrnCpy( n->scope, this_scope, 63 );
815 strupper( n->scope );
818 /*******************************************************************
819 Compare two nmb names
820 ******************************************************************/
822 BOOL nmb_name_equal(struct nmb_name *n1, struct nmb_name *n2)
824 return ((n1->name_type == n2->name_type) &&
825 strequal(n1->name ,n2->name ) &&
826 strequal(n1->scope,n2->scope));
829 /*******************************************************************
830 build a nmb packet ready for sending
832 XXXX this currently relies on not being passed something that expands
833 to a packet too big for the buffer. Eventually this should be
834 changed to set the trunc bit so the receiver can request the rest
835 via tcp (when that becomes supported)
836 ******************************************************************/
837 static int build_nmb(char *buf,struct packet_struct *p)
839 struct nmb_packet *nmb = &p->packet.nmb;
840 unsigned char *ubuf = (unsigned char *)buf;
843 /* put in the header */
844 RSSVAL(ubuf,offset,nmb->header.name_trn_id);
845 ubuf[offset+2] = (nmb->header.opcode & 0xF) << 3;
846 if (nmb->header.response) ubuf[offset+2] |= (1<<7);
847 if (nmb->header.nm_flags.authoritative &&
848 nmb->header.response) ubuf[offset+2] |= 0x4;
849 if (nmb->header.nm_flags.trunc) ubuf[offset+2] |= 0x2;
850 if (nmb->header.nm_flags.recursion_desired) ubuf[offset+2] |= 0x1;
851 if (nmb->header.nm_flags.recursion_available &&
852 nmb->header.response) ubuf[offset+3] |= 0x80;
853 if (nmb->header.nm_flags.bcast) ubuf[offset+3] |= 0x10;
854 ubuf[offset+3] |= (nmb->header.rcode & 0xF);
856 RSSVAL(ubuf,offset+4,nmb->header.qdcount);
857 RSSVAL(ubuf,offset+6,nmb->header.ancount);
858 RSSVAL(ubuf,offset+8,nmb->header.nscount);
859 RSSVAL(ubuf,offset+10,nmb->header.arcount);
862 if (nmb->header.qdcount) {
863 /* XXXX this doesn't handle a qdcount of > 1 */
864 offset += put_nmb_name((char *)ubuf,offset,&nmb->question.question_name);
865 RSSVAL(ubuf,offset,nmb->question.question_type);
866 RSSVAL(ubuf,offset+2,nmb->question.question_class);
870 if (nmb->header.ancount)
871 offset += put_res_rec((char *)ubuf,offset,nmb->answers,
872 nmb->header.ancount);
874 if (nmb->header.nscount)
875 offset += put_res_rec((char *)ubuf,offset,nmb->nsrecs,
876 nmb->header.nscount);
879 * The spec says we must put compressed name pointers
880 * in the following outgoing packets :
881 * NAME_REGISTRATION_REQUEST, NAME_REFRESH_REQUEST,
882 * NAME_RELEASE_REQUEST.
885 if((nmb->header.response == False) &&
886 ((nmb->header.opcode == NMB_NAME_REG_OPCODE) ||
887 (nmb->header.opcode == NMB_NAME_RELEASE_OPCODE) ||
888 (nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_8) ||
889 (nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_9) ||
890 (nmb->header.opcode == NMB_NAME_MULTIHOMED_REG_OPCODE)) &&
891 (nmb->header.arcount == 1)) {
893 offset += put_compressed_name_ptr(ubuf,offset,nmb->additional,12);
895 } else if (nmb->header.arcount) {
896 offset += put_res_rec((char *)ubuf,offset,nmb->additional,
897 nmb->header.arcount);
903 /*******************************************************************
905 ******************************************************************/
906 BOOL send_packet(struct packet_struct *p)
911 memset(buf,'\0',sizeof(buf));
913 switch (p->packet_type)
916 len = build_nmb(buf,p);
921 len = build_dgram(buf,p);
925 if (!len) return(False);
927 return(send_udp(p->fd,buf,len,p->ip,p->port));
930 /****************************************************************************
931 receive a packet with timeout on a open UDP filedescriptor
932 The timeout is in milliseconds
933 ***************************************************************************/
934 struct packet_struct *receive_packet(int fd,enum packet_type type,int t)
937 struct timeval timeout;
941 timeout.tv_sec = t/1000;
942 timeout.tv_usec = 1000*(t%1000);
944 sys_select(fd+1,&fds,&timeout);
946 if (FD_ISSET(fd,&fds))
947 return(read_packet(fd,type));
953 /****************************************************************************
954 return the number of bits that match between two 4 character buffers
955 ***************************************************************************/
956 static int matching_bits(uchar *p1, uchar *p2)
959 for (i=0; i<4; i++) {
960 if (p1[i] != p2[i]) break;
964 if (i==4) return ret;
966 for (j=0; j<8; j++) {
967 if ((p1[i] & (1<<(7-j))) != (p2[i] & (1<<(7-j)))) break;
975 static uchar sort_ip[4];
977 /****************************************************************************
978 compare two query reply records
979 ***************************************************************************/
980 static int name_query_comp(uchar *p1, uchar *p2)
982 return matching_bits(p2+2, sort_ip) - matching_bits(p1+2, sort_ip);
985 /****************************************************************************
986 sort a set of 6 byte name query response records so that the IPs that
987 have the most leading bits in common with the specified address come first
988 ***************************************************************************/
989 void sort_query_replies(char *data, int n, struct in_addr ip)
993 putip(sort_ip, (char *)&ip);
995 qsort(data, n, 6, QSORT_CAST name_query_comp);