RFC1002 says we must put compressed name pointers in the following

outgoing packets :

NMB_NAME_REG_OPCODE, NMB_NAME_RELEASE_OPCODE, NMB_NAME_REFRESH_OPCODE,
NMB_NAME_MULTIHOMED_REG_OPCODE.

A WINS server written by Shadow Software was rejecting our packets
as we weren't using name pointers in those requests (talk about
picky :-).

Jeremy.

diff --git a/source/libsmb/nmblib.c b/source/libsmb/nmblib.c
index 1400b88434247cd8b6a4b6f80f26e24e546c7332..f2aee12615eb247adb8a2371bedcea32e0752a03 100644 (file)
--- a/source/libsmb/nmblib.c
+++ b/source/libsmb/nmblib.c
@@ -362,6 +362,27 @@ static int put_res_rec(char *buf,int offset,struct res_rec *recs,int count)
   return(ret);
 }
 
+/*******************************************************************
+  put a compressed name pointer record into a packet
+  ******************************************************************/
+static int put_compressed_name_ptr(unsigned char *buf,int offset,struct res_rec *rec,int ptr_offset)
+{  
+  int ret=0;
+  buf[offset] = (0xC0 | ((ptr_offset >> 8) & 0xFF));
+  buf[offset+1] = (ptr_offset & 0xFF);
+  offset += 2;
+  ret += 2;
+  RSSVAL(buf,offset,rec->rr_type);
+  RSSVAL(buf,offset+2,rec->rr_class);
+  RSIVAL(buf,offset+4,rec->ttl);
+  RSSVAL(buf,offset+8,rec->rdlength);
+  memcpy(buf+offset+10,rec->rdata,rec->rdlength);
+  offset += 10+rec->rdlength;
+  ret += 10+rec->rdlength;
+    
+  return(ret);
+}
+
 /*******************************************************************
   parse a dgram packet. Return False if the packet can't be parsed 
   or is invalid for some reason, True otherwise 
@@ -808,10 +829,27 @@ static int build_nmb(char *buf,struct packet_struct *p)
     offset += put_res_rec((char *)ubuf,offset,nmb->nsrecs,
                          nmb->header.nscount);
 
-  if (nmb->header.arcount)
+  /*
+   * The spec says we must put compressed name pointers
+   * in the following outgoing packets :
+   * NAME_REGISTRATION_REQUEST, NAME_REFRESH_REQUEST,
+   * NAME_RELEASE_REQUEST.
+   */
+
+  if((nmb->header.response == False) &&
+     ((nmb->header.opcode == NMB_NAME_REG_OPCODE) ||
+      (nmb->header.opcode == NMB_NAME_RELEASE_OPCODE) ||
+      (nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_8) ||
+      (nmb->header.opcode == NMB_NAME_REFRESH_OPCODE_9) ||
+      (nmb->header.opcode == NMB_NAME_MULTIHOMED_REG_OPCODE)) &&
+     (nmb->header.arcount == 1)) {
+
+    offset += put_compressed_name_ptr(ubuf,offset,nmb->additional,12);
+
+  } else if (nmb->header.arcount) {
     offset += put_res_rec((char *)ubuf,offset,nmb->additional,
                          nmb->header.arcount);  
-
+  }
   return(offset);
 }