[En-Nut-Discussion] Small WINS utility for the community

[Zodianet]

Ok Harald,
It's done. Take this. 
Jean Pierre

/*
  * Copyright (C) 2004 by Jean Pierre Gauthier. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. Neither the name of the copyright holders nor the names of
  *    contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY <YOUR NAME> AND CONTRIBUTORS
  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <YOUR NAME>
  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */

/* ********************************************************* */
/* 
Netbios WINS (RFC 1002) Name Query. 
Only Query Request Client Routine sending/Positive Name Query Response
receiving
are implemented. 
When the Netbios Name Query request UDP datagram is on the ethernet network,
asking 
"Who is 'name'?", NutWinsNameQuery answers with the specified 'ipaddr'
Ethernut IP address. 
Answer to Microsoft Windows/Internet Explorer calls by "http://name" command
line
(and even directly "name" as command line if "name" is not a shared folder).


Launch for example :
THREAD(wins_deamon, arg)
{
NutWinsNameQuery  (  "myboard", inet_addr(MYIP) ) ;
} 
*/
/* ********************************************************* */

#include <string.h>

#include <sys/device.h>
#include <sys/timer.h>
#include <sys/heap.h>

#include <arpa/inet.h>
#include <net/if_var.h>
#include <netinet/sostream.h>

#ifdef NUTDEBUG
#include <stdio.h>
#endif

extern u_char toupper (u_char);
/* ********************************************************* */
typedef struct { 
    u_short id;
    u_short flags;
    u_short quests;
    u_short answers;
    u_short authrr;
    u_short addrr;
	u_char  namelen;
	u_char  name[33];
    u_short type;
    u_short class; /* end of request */
    u_long  ttl;
	u_short len_rep;
	u_char  node_flags;
	u_char  node_type;
	u_long  ip_addr ; /* end of answer*/
} WINSHEADER;


/* ********************************************************* */
int NutWinsNameQuery  (  u_char * name, u_long ipaddr ) 
{ /* name : netbios label (15 chars max), ipaddr : network ordered IP
address bytes */
    WINSHEADER *pkt=NULL;
	u_char *encoded = NULL;
    UDPSOCKET *sock;
    u_long raddr;
    u_short rport;
	u_char car ;
	int i,j;
	 if ( strlen(name) > 15)
	  	 return -1;
	 if (( (pkt = NutHeapAllocClear(sizeof(WINSHEADER))) == NULL) ||
		 ((encoded = NutHeapAllocClear(33)) == NULL) ||
		  ((sock = NutUdpCreateSocket(137)) == 0)  /* NETBIOS UDP
port */
	    )
		{
		if (pkt != NULL)
            NutHeapFree(pkt);
		if (encoded != NULL)
            NutHeapFree(encoded);
		 return -1;
		 }
   j= 0;
   for (i=0; i<16; i++) /* label  'compression' */
	  {
	  car= toupper (i < strlen(name) ? name[i] : ' ') ;
	  if (i==15)
	    car = 0;
	  encoded[j] = (car >>4) + 'A' ;
	  encoded[j+1] = (car & 0xf) + 'A' ;
	  j += 2;
	  }
	  encoded[j] = 0;
	 /* printf("local compressed name=\n%s \n",encoded); */
    for(;;)   /* infinite loop / Netbios deamon */
		   {
       	   NutUdpReceiveFrom(sock, &raddr, &rport, pkt, sizeof(WINSHEADER),
0);
		   /* RFC1002 Name Query Request verification */
		   if   ( ((ntohs(pkt->flags) & 0xf800) != 0) || 
		         (ntohs(pkt->quests) != 1) || 
			     (pkt->namelen != 0x20)  ||
				 (ntohs(pkt->type) != 32) ||
				 (ntohs(pkt->class) != 1) ||
				 (strcmp (pkt->name, encoded)))
				    continue; /* bad request, try again */
		   /* printf("Name=%s recognized\r\n",name); */
		   /* build RFC1002 Positive Name Query Response */
		   pkt->flags = htons (0x8580) ; /* Response flags */
		   pkt->answers = htons (1) ;
		   pkt->ttl = htonl ((u_long) 60); /* 60 seconds validity */
	       pkt->len_rep = htons (6);
	       pkt->node_flags = pkt->node_type = pkt->quests = 0; /* B-type
node, etc... */
	       pkt->ip_addr = ipaddr ; /* Returned IP Address, end of
answer*/
		   NutUdpSendTo(sock, raddr, 137, pkt, sizeof(WINSHEADER));
/* send to netbios port */
		   memset(pkt, 0, sizeof(WINSHEADER));
	   	   }
}

/*@}*/









-----Message d'origine-----
De : en-nut-discussion-bounces at egnite.de
[mailto:en-nut-discussion-bounces at egnite.de] De la part de Harald Kipp
Envoyé : vendredi 16 janvier 2004 18:23
À : Ethernut User Chat (English)
Objet : Re: [En-Nut-Discussion] Small WINS utility for the community

Jean Pierre,

I received a short note from someone, who reminded me not to simply
"assume", that you agree to the Nut/OS license.

Can you please do us a favor and send the code again with a copyright header
like this

/*
  * Copyright (C) 2004 by <your name>. All rights reserved.
  *
*/

Please replace <your name> with what it says. Sorry to bother you with this
legal stuff.

Many thanks,

Harald
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