2 Unix SMB/CIFS implementation.
3 NBT netbios library routines
4 Copyright (C) Andrew Tridgell 1994-1998
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 int num_good_sends
= 0;
25 int num_good_receives
= 0;
27 static const struct opcode_names
{
28 const char *nmb_opcode_name
;
30 } nmb_header_opcode_names
[] = {
36 {"Refresh(altcode)", 9 },
37 {"Multi-homed Registration", 15 },
41 /****************************************************************************
42 Lookup a nmb opcode name.
43 ****************************************************************************/
45 static const char *lookup_opcode_name( int opcode
)
47 const struct opcode_names
*op_namep
;
50 for(i
= 0; nmb_header_opcode_names
[i
].nmb_opcode_name
!= 0; i
++) {
51 op_namep
= &nmb_header_opcode_names
[i
];
52 if(opcode
== op_namep
->opcode
)
53 return op_namep
->nmb_opcode_name
;
55 return "<unknown opcode>";
58 /****************************************************************************
59 Print out a res_rec structure.
60 ****************************************************************************/
62 static void debug_nmb_res_rec(struct res_rec
*res
, const char *hdr
)
66 DEBUGADD( 4, ( " %s: nmb_name=%s rr_type=%d rr_class=%d ttl=%d\n",
68 nmb_namestr(&res
->rr_name
),
73 if( res
->rdlength
== 0 || res
->rdata
== NULL
)
76 for (i
= 0; i
< res
->rdlength
; i
+= MAX_NETBIOSNAME_LEN
) {
77 DEBUGADD(4, (" %s %3x char ", hdr
, i
));
79 for (j
= 0; j
< MAX_NETBIOSNAME_LEN
; j
++) {
80 unsigned char x
= res
->rdata
[i
+j
];
81 if (x
< 32 || x
> 127)
84 if (i
+j
>= res
->rdlength
)
86 DEBUGADD(4, ("%c", x
));
89 DEBUGADD(4, (" hex "));
91 for (j
= 0; j
< MAX_NETBIOSNAME_LEN
; j
++) {
92 if (i
+j
>= res
->rdlength
)
94 DEBUGADD(4, ("%02X", (unsigned char)res
->rdata
[i
+j
]));
101 /****************************************************************************
102 Process a nmb packet.
103 ****************************************************************************/
105 void debug_nmb_packet(struct packet_struct
*p
)
107 struct nmb_packet
*nmb
= &p
->packet
.nmb
;
109 if( DEBUGLVL( 4 ) ) {
110 dbgtext( "nmb packet from %s(%d) header: id=%d opcode=%s(%d) response=%s\n",
111 inet_ntoa(p
->ip
), p
->port
,
112 nmb
->header
.name_trn_id
,
113 lookup_opcode_name(nmb
->header
.opcode
),
115 BOOLSTR(nmb
->header
.response
) );
116 dbgtext( " header: flags: bcast=%s rec_avail=%s rec_des=%s trunc=%s auth=%s\n",
117 BOOLSTR(nmb
->header
.nm_flags
.bcast
),
118 BOOLSTR(nmb
->header
.nm_flags
.recursion_available
),
119 BOOLSTR(nmb
->header
.nm_flags
.recursion_desired
),
120 BOOLSTR(nmb
->header
.nm_flags
.trunc
),
121 BOOLSTR(nmb
->header
.nm_flags
.authoritative
) );
122 dbgtext( " header: rcode=%d qdcount=%d ancount=%d nscount=%d arcount=%d\n",
127 nmb
->header
.arcount
);
130 if (nmb
->header
.qdcount
) {
131 DEBUGADD( 4, ( " question: q_name=%s q_type=%d q_class=%d\n",
132 nmb_namestr(&nmb
->question
.question_name
),
133 nmb
->question
.question_type
,
134 nmb
->question
.question_class
) );
137 if (nmb
->answers
&& nmb
->header
.ancount
) {
138 debug_nmb_res_rec(nmb
->answers
,"answers");
140 if (nmb
->nsrecs
&& nmb
->header
.nscount
) {
141 debug_nmb_res_rec(nmb
->nsrecs
,"nsrecs");
143 if (nmb
->additional
&& nmb
->header
.arcount
) {
144 debug_nmb_res_rec(nmb
->additional
,"additional");
148 /*******************************************************************
149 Handle "compressed" name pointers.
150 ******************************************************************/
152 static BOOL
handle_name_ptrs(unsigned char *ubuf
,int *offset
,int length
,
153 BOOL
*got_pointer
,int *ret
)
157 while ((ubuf
[*offset
] & 0xC0) == 0xC0) {
161 (*offset
) = ((ubuf
[*offset
] & ~0xC0)<<8) | ubuf
[(*offset
)+1];
162 if (loop_count
++ == 10 || (*offset
) < 0 || (*offset
)>(length
-2)) {
169 /*******************************************************************
170 Parse a nmb name from "compressed" format to something readable
171 return the space taken by the name, or 0 if the name is invalid
172 ******************************************************************/
174 static int parse_nmb_name(char *inbuf
,int ofs
,int length
, struct nmb_name
*name
)
177 unsigned char *ubuf
= (unsigned char *)inbuf
;
179 BOOL got_pointer
=False
;
183 if (length
- offset
< 2)
186 /* handle initial name pointers */
187 if (!handle_name_ptrs(ubuf
,&offset
,length
,&got_pointer
,&ret
))
194 if ((m
& 0xC0) || offset
+m
+2 > length
)
197 memset((char *)name
,'\0',sizeof(*name
));
199 /* the "compressed" part */
205 c1
= ubuf
[offset
++]-'A';
206 c2
= ubuf
[offset
++]-'A';
207 if ((c1
& 0xF0) || (c2
& 0xF0) || (n
> sizeof(name
->name
)-1))
209 name
->name
[n
++] = (c1
<<4) | c2
;
214 if (n
==MAX_NETBIOSNAME_LEN
) {
215 /* parse out the name type, its always in the 16th byte of the name */
216 name
->name_type
= ((unsigned char)name
->name
[15]) & 0xff;
218 /* remove trailing spaces */
221 while (n
&& name
->name
[n
]==' ')
225 /* now the domain parts (if any) */
227 while (ubuf
[offset
]) {
228 /* we can have pointers within the domain part as well */
229 if (!handle_name_ptrs(ubuf
,&offset
,length
,&got_pointer
,&ret
))
234 * Don't allow null domain parts.
241 name
->scope
[n
++] = '.';
242 if (m
+2+offset
>length
|| n
+m
+1>sizeof(name
->scope
))
246 name
->scope
[n
++] = (char)ubuf
[offset
++];
249 * Watch for malicious loops.
251 if (loop_count
++ == 10)
254 name
->scope
[n
++] = 0;
259 /****************************************************************************
260 Put a netbios name, padding(s) and a name type into a 16 character buffer.
261 name is already in DOS charset.
262 [15 bytes name + padding][1 byte name type].
263 ****************************************************************************/
265 static void put_name(char *dest
, const char *name
, int pad
, unsigned int name_type
)
267 size_t len
= strlen(name
);
269 memcpy(dest
, name
, (len
< MAX_NETBIOSNAME_LEN
) ? len
: MAX_NETBIOSNAME_LEN
- 1);
270 if (len
< MAX_NETBIOSNAME_LEN
- 1) {
271 memset(dest
+ len
, pad
, MAX_NETBIOSNAME_LEN
- 1 - len
);
273 dest
[MAX_NETBIOSNAME_LEN
- 1] = name_type
;
276 /*******************************************************************
277 Put a compressed nmb name into a buffer. Return the length of the
280 Compressed names are really weird. The "compression" doubles the
281 size. The idea is that it also means that compressed names conform
282 to the doman name system. See RFC1002.
283 ******************************************************************/
285 static int put_nmb_name(char *buf
,int offset
,struct nmb_name
*name
)
291 if (strcmp(name
->name
,"*") == 0) {
292 /* special case for wildcard name */
293 put_name(buf1
, "*", '\0', name
->name_type
);
295 put_name(buf1
, name
->name
, ' ', name
->name_type
);
302 for (m
=0;m
<MAX_NETBIOSNAME_LEN
;m
++) {
303 buf
[offset
+1+2*m
] = 'A' + ((buf1
[m
]>>4)&0xF);
304 buf
[offset
+2+2*m
] = 'A' + (buf1
[m
]&0xF);
310 if (name
->scope
[0]) {
311 /* XXXX this scope handling needs testing */
312 ret
+= strlen(name
->scope
) + 1;
313 safe_strcpy(&buf
[offset
+1],name
->scope
,sizeof(name
->scope
));
316 while ((p
= strchr_m(p
,'.'))) {
317 buf
[offset
] = PTR_DIFF(p
,&buf
[offset
+1]);
318 offset
+= (buf
[offset
] + 1);
321 buf
[offset
] = strlen(&buf
[offset
+1]);
327 /*******************************************************************
328 Useful for debugging messages.
329 ******************************************************************/
331 char *nmb_namestr(struct nmb_name
*n
)
334 static fstring ret
[4];
338 pull_ascii_fstring(name
, n
->name
);
340 slprintf(p
,sizeof(fstring
)-1, "%s<%02x>",name
,n
->name_type
);
342 slprintf(p
,sizeof(fstring
)-1, "%s<%02x>.%s",name
,n
->name_type
,n
->scope
);
348 /*******************************************************************
349 Allocate and parse some resource records.
350 ******************************************************************/
352 static BOOL
parse_alloc_res_rec(char *inbuf
,int *offset
,int length
,
353 struct res_rec
**recs
, int count
)
357 *recs
= SMB_MALLOC_ARRAY(struct res_rec
, count
);
361 memset((char *)*recs
,'\0',sizeof(**recs
)*count
);
363 for (i
=0;i
<count
;i
++) {
364 int l
= parse_nmb_name(inbuf
,*offset
,length
,&(*recs
)[i
].rr_name
);
366 if (!l
|| (*offset
)+10 > length
) {
370 (*recs
)[i
].rr_type
= RSVAL(inbuf
,(*offset
));
371 (*recs
)[i
].rr_class
= RSVAL(inbuf
,(*offset
)+2);
372 (*recs
)[i
].ttl
= RIVAL(inbuf
,(*offset
)+4);
373 (*recs
)[i
].rdlength
= RSVAL(inbuf
,(*offset
)+8);
375 if ((*recs
)[i
].rdlength
>sizeof((*recs
)[i
].rdata
) ||
376 (*offset
)+(*recs
)[i
].rdlength
> length
) {
380 memcpy((*recs
)[i
].rdata
,inbuf
+(*offset
),(*recs
)[i
].rdlength
);
381 (*offset
) += (*recs
)[i
].rdlength
;
386 /*******************************************************************
387 Put a resource record into a packet.
388 ******************************************************************/
390 static int put_res_rec(char *buf
,int offset
,struct res_rec
*recs
,int count
)
395 for (i
=0;i
<count
;i
++) {
396 int l
= put_nmb_name(buf
,offset
,&recs
[i
].rr_name
);
399 RSSVAL(buf
,offset
,recs
[i
].rr_type
);
400 RSSVAL(buf
,offset
+2,recs
[i
].rr_class
);
401 RSIVAL(buf
,offset
+4,recs
[i
].ttl
);
402 RSSVAL(buf
,offset
+8,recs
[i
].rdlength
);
403 memcpy(buf
+offset
+10,recs
[i
].rdata
,recs
[i
].rdlength
);
404 offset
+= 10+recs
[i
].rdlength
;
405 ret
+= 10+recs
[i
].rdlength
;
411 /*******************************************************************
412 Put a compressed name pointer record into a packet.
413 ******************************************************************/
415 static int put_compressed_name_ptr(unsigned char *buf
,int offset
,struct res_rec
*rec
,int ptr_offset
)
418 buf
[offset
] = (0xC0 | ((ptr_offset
>> 8) & 0xFF));
419 buf
[offset
+1] = (ptr_offset
& 0xFF);
422 RSSVAL(buf
,offset
,rec
->rr_type
);
423 RSSVAL(buf
,offset
+2,rec
->rr_class
);
424 RSIVAL(buf
,offset
+4,rec
->ttl
);
425 RSSVAL(buf
,offset
+8,rec
->rdlength
);
426 memcpy(buf
+offset
+10,rec
->rdata
,rec
->rdlength
);
427 offset
+= 10+rec
->rdlength
;
428 ret
+= 10+rec
->rdlength
;
433 /*******************************************************************
434 Parse a dgram packet. Return False if the packet can't be parsed
435 or is invalid for some reason, True otherwise.
437 This is documented in section 4.4.1 of RFC1002.
438 ******************************************************************/
440 static BOOL
parse_dgram(char *inbuf
,int length
,struct dgram_packet
*dgram
)
445 memset((char *)dgram
,'\0',sizeof(*dgram
));
450 dgram
->header
.msg_type
= CVAL(inbuf
,0);
451 flags
= CVAL(inbuf
,1);
452 dgram
->header
.flags
.node_type
= (enum node_type
)((flags
>>2)&3);
454 dgram
->header
.flags
.more
= True
;
456 dgram
->header
.flags
.first
= True
;
457 dgram
->header
.dgm_id
= RSVAL(inbuf
,2);
458 putip((char *)&dgram
->header
.source_ip
,inbuf
+4);
459 dgram
->header
.source_port
= RSVAL(inbuf
,8);
460 dgram
->header
.dgm_length
= RSVAL(inbuf
,10);
461 dgram
->header
.packet_offset
= RSVAL(inbuf
,12);
465 if (dgram
->header
.msg_type
== 0x10 ||
466 dgram
->header
.msg_type
== 0x11 ||
467 dgram
->header
.msg_type
== 0x12) {
468 offset
+= parse_nmb_name(inbuf
,offset
,length
,&dgram
->source_name
);
469 offset
+= parse_nmb_name(inbuf
,offset
,length
,&dgram
->dest_name
);
472 if (offset
>= length
|| (length
-offset
> sizeof(dgram
->data
)))
475 dgram
->datasize
= length
-offset
;
476 memcpy(dgram
->data
,inbuf
+offset
,dgram
->datasize
);
478 /* Paranioa. Ensure the last 2 bytes in the dgram buffer are
479 zero. This should be true anyway, just enforce it for paranioa sake. JRA. */
480 SMB_ASSERT(dgram
->datasize
<= (sizeof(dgram
->data
)-2));
481 memset(&dgram
->data
[sizeof(dgram
->data
)-2], '\0', 2);
486 /*******************************************************************
487 Parse a nmb packet. Return False if the packet can't be parsed
488 or is invalid for some reason, True otherwise.
489 ******************************************************************/
491 static BOOL
parse_nmb(char *inbuf
,int length
,struct nmb_packet
*nmb
)
495 memset((char *)nmb
,'\0',sizeof(*nmb
));
500 /* parse the header */
501 nmb
->header
.name_trn_id
= RSVAL(inbuf
,0);
503 DEBUG(10,("parse_nmb: packet id = %d\n", nmb
->header
.name_trn_id
));
505 nmb
->header
.opcode
= (CVAL(inbuf
,2) >> 3) & 0xF;
506 nmb
->header
.response
= ((CVAL(inbuf
,2)>>7)&1)?True
:False
;
507 nm_flags
= ((CVAL(inbuf
,2) & 0x7) << 4) + (CVAL(inbuf
,3)>>4);
508 nmb
->header
.nm_flags
.bcast
= (nm_flags
&1)?True
:False
;
509 nmb
->header
.nm_flags
.recursion_available
= (nm_flags
&8)?True
:False
;
510 nmb
->header
.nm_flags
.recursion_desired
= (nm_flags
&0x10)?True
:False
;
511 nmb
->header
.nm_flags
.trunc
= (nm_flags
&0x20)?True
:False
;
512 nmb
->header
.nm_flags
.authoritative
= (nm_flags
&0x40)?True
:False
;
513 nmb
->header
.rcode
= CVAL(inbuf
,3) & 0xF;
514 nmb
->header
.qdcount
= RSVAL(inbuf
,4);
515 nmb
->header
.ancount
= RSVAL(inbuf
,6);
516 nmb
->header
.nscount
= RSVAL(inbuf
,8);
517 nmb
->header
.arcount
= RSVAL(inbuf
,10);
519 if (nmb
->header
.qdcount
) {
520 offset
= parse_nmb_name(inbuf
,12,length
,&nmb
->question
.question_name
);
524 if (length
- (12+offset
) < 4)
526 nmb
->question
.question_type
= RSVAL(inbuf
,12+offset
);
527 nmb
->question
.question_class
= RSVAL(inbuf
,12+offset
+2);
534 /* and any resource records */
535 if (nmb
->header
.ancount
&& !parse_alloc_res_rec(inbuf
,&offset
,length
,&nmb
->answers
,
536 nmb
->header
.ancount
))
539 if (nmb
->header
.nscount
&& !parse_alloc_res_rec(inbuf
,&offset
,length
,&nmb
->nsrecs
,
540 nmb
->header
.nscount
))
543 if (nmb
->header
.arcount
&& !parse_alloc_res_rec(inbuf
,&offset
,length
,&nmb
->additional
,
544 nmb
->header
.arcount
))
550 /*******************************************************************
551 'Copy constructor' for an nmb packet.
552 ******************************************************************/
554 static struct packet_struct
*copy_nmb_packet(struct packet_struct
*packet
)
556 struct nmb_packet
*nmb
;
557 struct nmb_packet
*copy_nmb
;
558 struct packet_struct
*pkt_copy
;
560 if(( pkt_copy
= SMB_MALLOC_P(struct packet_struct
)) == NULL
) {
561 DEBUG(0,("copy_nmb_packet: malloc fail.\n"));
565 /* Structure copy of entire thing. */
569 /* Ensure this copy is not locked. */
570 pkt_copy
->locked
= False
;
572 /* Ensure this copy has no resource records. */
573 nmb
= &packet
->packet
.nmb
;
574 copy_nmb
= &pkt_copy
->packet
.nmb
;
576 copy_nmb
->answers
= NULL
;
577 copy_nmb
->nsrecs
= NULL
;
578 copy_nmb
->additional
= NULL
;
580 /* Now copy any resource records. */
583 if((copy_nmb
->answers
= SMB_MALLOC_ARRAY(struct res_rec
,nmb
->header
.ancount
)) == NULL
)
585 memcpy((char *)copy_nmb
->answers
, (char *)nmb
->answers
,
586 nmb
->header
.ancount
* sizeof(struct res_rec
));
589 if((copy_nmb
->nsrecs
= SMB_MALLOC_ARRAY(struct res_rec
, nmb
->header
.nscount
)) == NULL
)
591 memcpy((char *)copy_nmb
->nsrecs
, (char *)nmb
->nsrecs
,
592 nmb
->header
.nscount
* sizeof(struct res_rec
));
594 if (nmb
->additional
) {
595 if((copy_nmb
->additional
= SMB_MALLOC_ARRAY(struct res_rec
, nmb
->header
.arcount
)) == NULL
)
597 memcpy((char *)copy_nmb
->additional
, (char *)nmb
->additional
,
598 nmb
->header
.arcount
* sizeof(struct res_rec
));
605 SAFE_FREE(copy_nmb
->answers
);
606 SAFE_FREE(copy_nmb
->nsrecs
);
607 SAFE_FREE(copy_nmb
->additional
);
610 DEBUG(0,("copy_nmb_packet: malloc fail in resource records.\n"));
614 /*******************************************************************
615 'Copy constructor' for a dgram packet.
616 ******************************************************************/
618 static struct packet_struct
*copy_dgram_packet(struct packet_struct
*packet
)
620 struct packet_struct
*pkt_copy
;
622 if(( pkt_copy
= SMB_MALLOC_P(struct packet_struct
)) == NULL
) {
623 DEBUG(0,("copy_dgram_packet: malloc fail.\n"));
627 /* Structure copy of entire thing. */
631 /* Ensure this copy is not locked. */
632 pkt_copy
->locked
= False
;
634 /* There are no additional pointers in a dgram packet,
639 /*******************************************************************
640 'Copy constructor' for a generic packet.
641 ******************************************************************/
643 struct packet_struct
*copy_packet(struct packet_struct
*packet
)
645 if(packet
->packet_type
== NMB_PACKET
)
646 return copy_nmb_packet(packet
);
647 else if (packet
->packet_type
== DGRAM_PACKET
)
648 return copy_dgram_packet(packet
);
652 /*******************************************************************
653 Free up any resources associated with an nmb packet.
654 ******************************************************************/
656 static void free_nmb_packet(struct nmb_packet
*nmb
)
658 SAFE_FREE(nmb
->answers
);
659 SAFE_FREE(nmb
->nsrecs
);
660 SAFE_FREE(nmb
->additional
);
663 /*******************************************************************
664 Free up any resources associated with a dgram packet.
665 ******************************************************************/
667 static void free_dgram_packet(struct dgram_packet
*nmb
)
669 /* We have nothing to do for a dgram packet. */
672 /*******************************************************************
673 Free up any resources associated with a packet.
674 ******************************************************************/
676 void free_packet(struct packet_struct
*packet
)
680 if (packet
->packet_type
== NMB_PACKET
)
681 free_nmb_packet(&packet
->packet
.nmb
);
682 else if (packet
->packet_type
== DGRAM_PACKET
)
683 free_dgram_packet(&packet
->packet
.dgram
);
684 ZERO_STRUCTPN(packet
);
688 /*******************************************************************
689 Parse a packet buffer into a packet structure.
690 ******************************************************************/
692 struct packet_struct
*parse_packet(char *buf
,int length
,
693 enum packet_type packet_type
)
695 extern struct in_addr lastip
;
697 struct packet_struct
*p
;
700 p
= SMB_MALLOC_P(struct packet_struct
);
709 p
->timestamp
= time(NULL
);
710 p
->packet_type
= packet_type
;
712 switch (packet_type
) {
714 ok
= parse_nmb(buf
,length
,&p
->packet
.nmb
);
718 ok
= parse_dgram(buf
,length
,&p
->packet
.dgram
);
730 /*******************************************************************
731 Read a packet from a socket and parse it, returning a packet ready
732 to be used or put on the queue. This assumes a UDP socket.
733 ******************************************************************/
735 struct packet_struct
*read_packet(int fd
,enum packet_type packet_type
)
737 struct packet_struct
*packet
;
738 char buf
[MAX_DGRAM_SIZE
];
741 length
= read_udp_socket(fd
,buf
,sizeof(buf
));
742 if (length
< MIN_DGRAM_SIZE
)
745 packet
= parse_packet(buf
, length
, packet_type
);
753 DEBUG(5,("Received a packet of len %d from (%s) port %d\n",
754 length
, inet_ntoa(packet
->ip
), packet
->port
) );
759 /*******************************************************************
760 Send a udp packet on a already open socket.
761 ******************************************************************/
763 static BOOL
send_udp(int fd
,char *buf
,int len
,struct in_addr ip
,int port
)
767 struct sockaddr_in sock_out
;
769 /* set the address and port */
770 memset((char *)&sock_out
,'\0',sizeof(sock_out
));
771 putip((char *)&sock_out
.sin_addr
,(char *)&ip
);
772 sock_out
.sin_port
= htons( port
);
773 sock_out
.sin_family
= AF_INET
;
775 DEBUG( 5, ( "Sending a packet of len %d to (%s) on port %d\n",
776 len
, inet_ntoa(ip
), port
) );
779 * Patch to fix asynch error notifications from Linux kernel.
782 for (i
= 0; i
< 5; i
++) {
783 ret
= (sendto(fd
,buf
,len
,0,(struct sockaddr
*)&sock_out
, sizeof(sock_out
)) >= 0);
784 if (ret
|| errno
!= ECONNREFUSED
)
789 DEBUG(0,("Packet send failed to %s(%d) ERRNO=%s\n",
790 inet_ntoa(ip
),port
,strerror(errno
)));
798 /*******************************************************************
799 Build a dgram packet ready for sending.
801 XXXX This currently doesn't handle packets too big for one
802 datagram. It should split them and use the packet_offset, more and
803 first flags to handle the fragmentation. Yuck.
805 [...but it isn't clear that we would ever need to send a
806 a fragmented NBT Datagram. The IP layer does its own
807 fragmentation to ensure that messages can fit into the path
808 MTU. It *is* important to be able to receive and rebuild
809 fragmented NBT datagrams, just in case someone out there
810 really has implemented this 'feature'. crh -)------ ]
812 ******************************************************************/
814 static int build_dgram(char *buf
,struct packet_struct
*p
)
816 struct dgram_packet
*dgram
= &p
->packet
.dgram
;
817 unsigned char *ubuf
= (unsigned char *)buf
;
820 /* put in the header */
821 ubuf
[0] = dgram
->header
.msg_type
;
822 ubuf
[1] = (((int)dgram
->header
.flags
.node_type
)<<2);
823 if (dgram
->header
.flags
.more
)
825 if (dgram
->header
.flags
.first
)
827 RSSVAL(ubuf
,2,dgram
->header
.dgm_id
);
828 putip(ubuf
+4,(char *)&dgram
->header
.source_ip
);
829 RSSVAL(ubuf
,8,dgram
->header
.source_port
);
830 RSSVAL(ubuf
,12,dgram
->header
.packet_offset
);
834 if (dgram
->header
.msg_type
== 0x10 ||
835 dgram
->header
.msg_type
== 0x11 ||
836 dgram
->header
.msg_type
== 0x12) {
837 offset
+= put_nmb_name((char *)ubuf
,offset
,&dgram
->source_name
);
838 offset
+= put_nmb_name((char *)ubuf
,offset
,&dgram
->dest_name
);
841 memcpy(ubuf
+offset
,dgram
->data
,dgram
->datasize
);
842 offset
+= dgram
->datasize
;
844 /* automatically set the dgm_length
845 * NOTE: RFC1002 says the dgm_length does *not*
846 * include the fourteen-byte header. crh
848 dgram
->header
.dgm_length
= (offset
- 14);
849 RSSVAL(ubuf
,10,dgram
->header
.dgm_length
);
854 /*******************************************************************
856 *******************************************************************/
858 void make_nmb_name( struct nmb_name
*n
, const char *name
, int type
)
861 memset( (char *)n
, '\0', sizeof(struct nmb_name
) );
862 fstrcpy(unix_name
, name
);
863 strupper_m(unix_name
);
864 push_ascii(n
->name
, unix_name
, sizeof(n
->name
), STR_TERMINATE
);
865 n
->name_type
= (unsigned int)type
& 0xFF;
866 push_ascii(n
->scope
, global_scope(), 64, STR_TERMINATE
);
869 /*******************************************************************
870 Compare two nmb names
871 ******************************************************************/
873 BOOL
nmb_name_equal(struct nmb_name
*n1
, struct nmb_name
*n2
)
875 return ((n1
->name_type
== n2
->name_type
) &&
876 strequal(n1
->name
,n2
->name
) &&
877 strequal(n1
->scope
,n2
->scope
));
880 /*******************************************************************
881 Build a nmb packet ready for sending.
883 XXXX this currently relies on not being passed something that expands
884 to a packet too big for the buffer. Eventually this should be
885 changed to set the trunc bit so the receiver can request the rest
886 via tcp (when that becomes supported)
887 ******************************************************************/
889 static int build_nmb(char *buf
,struct packet_struct
*p
)
891 struct nmb_packet
*nmb
= &p
->packet
.nmb
;
892 unsigned char *ubuf
= (unsigned char *)buf
;
895 /* put in the header */
896 RSSVAL(ubuf
,offset
,nmb
->header
.name_trn_id
);
897 ubuf
[offset
+2] = (nmb
->header
.opcode
& 0xF) << 3;
898 if (nmb
->header
.response
)
899 ubuf
[offset
+2] |= (1<<7);
900 if (nmb
->header
.nm_flags
.authoritative
&&
901 nmb
->header
.response
)
902 ubuf
[offset
+2] |= 0x4;
903 if (nmb
->header
.nm_flags
.trunc
)
904 ubuf
[offset
+2] |= 0x2;
905 if (nmb
->header
.nm_flags
.recursion_desired
)
906 ubuf
[offset
+2] |= 0x1;
907 if (nmb
->header
.nm_flags
.recursion_available
&&
908 nmb
->header
.response
)
909 ubuf
[offset
+3] |= 0x80;
910 if (nmb
->header
.nm_flags
.bcast
)
911 ubuf
[offset
+3] |= 0x10;
912 ubuf
[offset
+3] |= (nmb
->header
.rcode
& 0xF);
914 RSSVAL(ubuf
,offset
+4,nmb
->header
.qdcount
);
915 RSSVAL(ubuf
,offset
+6,nmb
->header
.ancount
);
916 RSSVAL(ubuf
,offset
+8,nmb
->header
.nscount
);
917 RSSVAL(ubuf
,offset
+10,nmb
->header
.arcount
);
920 if (nmb
->header
.qdcount
) {
921 /* XXXX this doesn't handle a qdcount of > 1 */
922 offset
+= put_nmb_name((char *)ubuf
,offset
,&nmb
->question
.question_name
);
923 RSSVAL(ubuf
,offset
,nmb
->question
.question_type
);
924 RSSVAL(ubuf
,offset
+2,nmb
->question
.question_class
);
928 if (nmb
->header
.ancount
)
929 offset
+= put_res_rec((char *)ubuf
,offset
,nmb
->answers
,
930 nmb
->header
.ancount
);
932 if (nmb
->header
.nscount
)
933 offset
+= put_res_rec((char *)ubuf
,offset
,nmb
->nsrecs
,
934 nmb
->header
.nscount
);
937 * The spec says we must put compressed name pointers
938 * in the following outgoing packets :
939 * NAME_REGISTRATION_REQUEST, NAME_REFRESH_REQUEST,
940 * NAME_RELEASE_REQUEST.
943 if((nmb
->header
.response
== False
) &&
944 ((nmb
->header
.opcode
== NMB_NAME_REG_OPCODE
) ||
945 (nmb
->header
.opcode
== NMB_NAME_RELEASE_OPCODE
) ||
946 (nmb
->header
.opcode
== NMB_NAME_REFRESH_OPCODE_8
) ||
947 (nmb
->header
.opcode
== NMB_NAME_REFRESH_OPCODE_9
) ||
948 (nmb
->header
.opcode
== NMB_NAME_MULTIHOMED_REG_OPCODE
)) &&
949 (nmb
->header
.arcount
== 1)) {
951 offset
+= put_compressed_name_ptr(ubuf
,offset
,nmb
->additional
,12);
953 } else if (nmb
->header
.arcount
) {
954 offset
+= put_res_rec((char *)ubuf
,offset
,nmb
->additional
,
955 nmb
->header
.arcount
);
960 /*******************************************************************
962 ******************************************************************/
964 int build_packet(char *buf
, struct packet_struct
*p
)
968 switch (p
->packet_type
) {
970 len
= build_nmb(buf
,p
);
974 len
= build_dgram(buf
,p
);
981 /*******************************************************************
982 Send a packet_struct.
983 ******************************************************************/
985 BOOL
send_packet(struct packet_struct
*p
)
990 memset(buf
,'\0',sizeof(buf
));
992 len
= build_packet(buf
, p
);
997 return(send_udp(p
->fd
,buf
,len
,p
->ip
,p
->port
));
1000 /****************************************************************************
1001 Receive a packet with timeout on a open UDP filedescriptor.
1002 The timeout is in milliseconds
1003 ***************************************************************************/
1005 struct packet_struct
*receive_packet(int fd
,enum packet_type type
,int t
)
1008 struct timeval timeout
;
1013 timeout
.tv_sec
= t
/1000;
1014 timeout
.tv_usec
= 1000*(t
%1000);
1016 if ((ret
= sys_select_intr(fd
+1,&fds
,NULL
,NULL
,&timeout
)) == -1) {
1017 /* errno should be EBADF or EINVAL. */
1018 DEBUG(0,("select returned -1, errno = %s (%d)\n", strerror(errno
), errno
));
1022 if (ret
== 0) /* timeout */
1025 if (FD_ISSET(fd
,&fds
))
1026 return(read_packet(fd
,type
));
1031 /****************************************************************************
1032 Receive a UDP/137 packet either via UDP or from the unexpected packet
1033 queue. The packet must be a reply packet and have the specified trn_id.
1034 The timeout is in milliseconds.
1035 ***************************************************************************/
1037 struct packet_struct
*receive_nmb_packet(int fd
, int t
, int trn_id
)
1039 struct packet_struct
*p
;
1041 p
= receive_packet(fd
, NMB_PACKET
, t
);
1043 if (p
&& p
->packet
.nmb
.header
.response
&&
1044 p
->packet
.nmb
.header
.name_trn_id
== trn_id
) {
1050 /* try the unexpected packet queue */
1051 return receive_unexpected(NMB_PACKET
, trn_id
, NULL
);
1054 /****************************************************************************
1055 Receive a UDP/138 packet either via UDP or from the unexpected packet
1056 queue. The packet must be a reply packet and have the specified mailslot name
1057 The timeout is in milliseconds.
1058 ***************************************************************************/
1060 struct packet_struct
*receive_dgram_packet(int fd
, int t
, const char *mailslot_name
)
1062 struct packet_struct
*p
;
1064 p
= receive_packet(fd
, DGRAM_PACKET
, t
);
1066 if (p
&& match_mailslot_name(p
, mailslot_name
)) {
1072 /* try the unexpected packet queue */
1073 return receive_unexpected(DGRAM_PACKET
, 0, mailslot_name
);
1076 /****************************************************************************
1077 See if a datagram has the right mailslot name.
1078 ***************************************************************************/
1080 BOOL
match_mailslot_name(struct packet_struct
*p
, const char *mailslot_name
)
1082 struct dgram_packet
*dgram
= &p
->packet
.dgram
;
1085 buf
= &dgram
->data
[0];
1090 if (memcmp(buf
, mailslot_name
, strlen(mailslot_name
)+1) == 0) {
1097 /****************************************************************************
1098 Return the number of bits that match between two 4 character buffers
1099 ***************************************************************************/
1101 int matching_quad_bits(unsigned char *p1
, unsigned char *p2
)
1104 for (i
=0; i
<4; i
++) {
1113 for (j
=0; j
<8; j
++) {
1114 if ((p1
[i
] & (1<<(7-j
))) != (p2
[i
] & (1<<(7-j
))))
1122 static unsigned char sort_ip
[4];
1124 /****************************************************************************
1125 Compare two query reply records.
1126 ***************************************************************************/
1128 static int name_query_comp(unsigned char *p1
, unsigned char *p2
)
1130 return matching_quad_bits(p2
+2, sort_ip
) - matching_quad_bits(p1
+2, sort_ip
);
1133 /****************************************************************************
1134 Sort a set of 6 byte name query response records so that the IPs that
1135 have the most leading bits in common with the specified address come first.
1136 ***************************************************************************/
1138 void sort_query_replies(char *data
, int n
, struct in_addr ip
)
1143 putip(sort_ip
, (char *)&ip
);
1145 qsort(data
, n
, 6, QSORT_CAST name_query_comp
);
1148 /*******************************************************************
1149 Convert, possibly using a stupid microsoft-ism which has destroyed
1150 the transport independence of netbios (for CIFS vendors that usually
1151 use the Win95-type methods, not for NT to NT communication, which uses
1152 DCE/RPC and therefore full-length unicode strings...) a dns name into
1155 The netbios name (NOT necessarily null-terminated) is truncated to 15
1158 ******************************************************************/
1160 char *dns_to_netbios_name(const char *dns_name
)
1162 static nstring netbios_name
;
1164 StrnCpy(netbios_name
, dns_name
, MAX_NETBIOSNAME_LEN
-1);
1165 netbios_name
[15] = 0;
1167 /* ok. this is because of a stupid microsoft-ism. if the called host
1168 name contains a '.', microsoft clients expect you to truncate the
1169 netbios name up to and including the '.' this even applies, by
1170 mistake, to workgroup (domain) names, which is _really_ daft.
1172 for (i
= 0; i
< 15; i
++) {
1173 if (netbios_name
[i
] == '.') {
1174 netbios_name
[i
] = 0;
1179 return netbios_name
;
1182 /****************************************************************************
1183 Interpret the weird netbios "name" into a unix fstring. Return the name type.
1184 ****************************************************************************/
1186 static int name_interpret(char *in
, fstring name
)
1189 int len
= (*in
++) / 2;
1191 char *out
= out_string
;
1195 if (len
> 30 || len
<1)
1199 if (in
[0] < 'A' || in
[0] > 'P' || in
[1] < 'A' || in
[1] > 'P') {
1203 *out
= ((in
[0]-'A')<<4) + (in
[1]-'A');
1210 #ifdef NETBIOS_SCOPE
1211 /* Handle any scope names */
1213 *out
++ = '.'; /* Scope names are separated by periods */
1214 len
= *(unsigned char *)in
++;
1215 StrnCpy(out
, in
, len
);
1221 pull_ascii_fstring(name
, out_string
);
1226 /****************************************************************************
1227 Mangle a name into netbios format.
1228 Note: <Out> must be (33 + strlen(scope) + 2) bytes long, at minimum.
1229 ****************************************************************************/
1231 int name_mangle( char *In
, char *Out
, char name_type
)
1238 /* Safely copy the input string, In, into buf[]. */
1239 if (strcmp(In
,"*") == 0)
1240 put_name(buf
, "*", '\0', 0x00);
1242 /* We use an fstring here as mb dos names can expend x3 when
1247 pull_ascii_fstring(buf_unix
, In
);
1248 strupper_m(buf_unix
);
1250 push_ascii_nstring(buf_dos
, buf_unix
);
1251 put_name(buf
, buf_dos
, ' ', name_type
);
1254 /* Place the length of the first field into the output buffer. */
1258 /* Now convert the name to the rfc1001/1002 format. */
1259 for( i
= 0; i
< MAX_NETBIOSNAME_LEN
; i
++ ) {
1260 p
[i
*2] = ( (buf
[i
] >> 4) & 0x000F ) + 'A';
1261 p
[(i
*2)+1] = (buf
[i
] & 0x000F) + 'A';
1266 /* Add the scope string. */
1267 for( i
= 0, len
= 0; *(global_scope()) != '\0'; i
++, len
++ ) {
1268 switch( (global_scope())[i
] ) {
1273 return( name_len(Out
) );
1280 p
[len
+1] = (global_scope())[i
];
1285 return( name_len(Out
) );
1288 /****************************************************************************
1289 Find a pointer to a netbios name.
1290 ****************************************************************************/
1292 static char *name_ptr(char *buf
,int ofs
)
1294 unsigned char c
= *(unsigned char *)(buf
+ofs
);
1296 if ((c
& 0xC0) == 0xC0) {
1297 uint16 l
= RSVAL(buf
, ofs
) & 0x3FFF;
1298 DEBUG(5,("name ptr to pos %d from %d is %s\n",l
,ofs
,buf
+l
));
1305 /****************************************************************************
1306 Extract a netbios name from a buf (into a unix string) return name type.
1307 ****************************************************************************/
1309 int name_extract(char *buf
,int ofs
, fstring name
)
1311 char *p
= name_ptr(buf
,ofs
);
1312 int d
= PTR_DIFF(p
,buf
+ofs
);
1315 if (d
< -50 || d
> 50)
1317 return(name_interpret(p
,name
));
1320 /****************************************************************************
1321 Return the total storage length of a mangled name.
1322 ****************************************************************************/
1324 int name_len(char *s1
)
1326 /* NOTE: this argument _must_ be unsigned */
1327 unsigned char *s
= (unsigned char *)s1
;
1330 /* If the two high bits of the byte are set, return 2. */
1331 if (0xC0 == (*s
& 0xC0))
1334 /* Add up the length bytes. */
1335 for (len
= 1; (*s
); s
+= (*s
) + 1) {
1337 SMB_ASSERT(len
< 80);