mirror of
https://github.com/ep00ch/lwip-contrib-mac.git
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317 lines
9.8 KiB
C
317 lines
9.8 KiB
C
/**
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* @file
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* NetBIOS name service sample
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*
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*/
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/*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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*/
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#include "lwip/opt.h"
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#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
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#include "lwip/udp.h"
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#include "lwip/netif.h"
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/** This is an example implementation of a NetBIOS name server.
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* It responds to name queries for a configurable name.
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* Name resolving is not supported.
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*
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* Note that the device doesn't broadcast it's own name so can't
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* detect duplicate names!
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*/
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/** NetBIOS name of LWIP device */
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#ifndef NETBIOS_LWIP_NAME
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#define NETBIOS_LWIP_NAME "NETBIOSLWIPDEV"
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#endif
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/** default port number for "NetBIOS Name service */
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#define NETBIOS_PORT 137
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/** size of a NetBIOS name */
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#define NETBIOS_NAME_LEN 16
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/** The Time-To-Live for NetBIOS name responds (in seconds)
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* Default is 300000 seconds (3 days, 11 hours, 20 minutes) */
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#define NETBIOS_NAME_TTL 300000
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/** NetBIOS header flags */
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#define NETB_HFLAG_RESPONSE 0x8000
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#define NETB_HFLAG_OPCODE 0x7800
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#define NETB_HFLAG_OPCODE_NAME_QUERY 0x0000
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#define NETB_HFLAG_AUTHORATIVE 0x0400
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#define NETB_HFLAG_TRUNCATED 0x0200
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#define NETB_HFLAG_RECURS_DESIRED 0x0100
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#define NETB_HFLAG_RECURS_AVAILABLE 0x0080
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#define NETB_HFLAG_BROADCAST 0x0010
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#define NETB_HFLAG_REPLYCODE 0x0008
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#define NETB_HFLAG_REPLYCODE_NOERROR 0x0000
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/** NetBIOS name flags */
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#define NETB_NFLAG_UNIQUE 0x8000
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#define NETB_NFLAG_NODETYPE 0x6000
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#define NETB_NFLAG_NODETYPE_HNODE 0x6000
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#define NETB_NFLAG_NODETYPE_MNODE 0x4000
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#define NETB_NFLAG_NODETYPE_PNODE 0x2000
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#define NETB_NFLAG_NODETYPE_BNODE 0x0000
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/** NetBIOS message header */
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/bpstruct.h"
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#endif
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PACK_STRUCT_BEGIN
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struct netbios_hdr {
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PACK_STRUCT_FIELD(u16_t trans_id);
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PACK_STRUCT_FIELD(u16_t flags);
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PACK_STRUCT_FIELD(u16_t questions);
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PACK_STRUCT_FIELD(u16_t answerRRs);
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PACK_STRUCT_FIELD(u16_t authorityRRs);
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PACK_STRUCT_FIELD(u16_t additionalRRs);
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} PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/epstruct.h"
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#endif
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/** NetBIOS message name part */
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/bpstruct.h"
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#endif
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PACK_STRUCT_BEGIN
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struct netbios_name_hdr {
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PACK_STRUCT_FIELD(u8_t nametype);
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PACK_STRUCT_FIELD(u8_t encname[(NETBIOS_NAME_LEN*2)+1]);
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PACK_STRUCT_FIELD(u16_t type);
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PACK_STRUCT_FIELD(u16_t class);
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PACK_STRUCT_FIELD(u32_t ttl);
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PACK_STRUCT_FIELD(u16_t datalen);
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PACK_STRUCT_FIELD(u16_t flags);
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PACK_STRUCT_FIELD(u32_t addr);
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} PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/epstruct.h"
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#endif
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/** NetBIOS message */
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/bpstruct.h"
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#endif
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PACK_STRUCT_BEGIN
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struct netbios_resp
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{
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struct netbios_hdr resp_hdr;
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struct netbios_name_hdr resp_name;
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} PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/epstruct.h"
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#endif
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/** NetBIOS decoding name */
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static int
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netbios_name_decoding( char *name_enc, char *name_dec, int name_dec_len)
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{
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char *pname;
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char cname;
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char cnbname;
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int index = 0;
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LWIP_UNUSED_ARG(name_dec_len);
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/* Start decoding netbios name. */
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pname = name_enc;
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for (;;) {
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/* Every two characters of the first level-encoded name
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* turn into one character in the decoded name. */
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cname = *pname;
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if (cname == '\0')
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break; /* no more characters */
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if (cname == '.')
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break; /* scope ID follows */
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if (cname < 'A' || cname > 'Z') {
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/* Not legal. */
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return -1;
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}
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cname -= 'A';
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cnbname = cname << 4;
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pname++;
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cname = *pname;
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if (cname == '\0' || cname == '.') {
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/* No more characters in the name - but we're in
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* the middle of a pair. Not legal. */
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return -1;
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}
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if (cname < 'A' || cname > 'Z') {
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/* Not legal. */
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return -1;
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}
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cname -= 'A';
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cnbname |= cname;
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pname++;
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/* Do we have room to store the character? */
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if (index < NETBIOS_NAME_LEN) {
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/* Yes - store the character. */
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name_dec[index++] = (cnbname!=' '?cnbname:'\0');
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}
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}
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return 0;
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}
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/** NetBIOS encoding name */
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static int
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netbios_name_encoding(char *name_enc, char *name_dec, int name_dec_len)
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{
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char *pname;
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char cname;
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unsigned char ucname;
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int index = 0;
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/* Start encoding netbios name. */
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pname = name_enc;
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for (;;) {
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/* Every two characters of the first level-encoded name
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* turn into one character in the decoded name. */
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cname = *pname;
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if (cname == '\0')
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break; /* no more characters */
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if (cname == '.')
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break; /* scope ID follows */
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if ((cname < 'A' || cname > 'Z') && (cname < '0' || cname > '9')) {
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/* Not legal. */
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return -1;
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}
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/* Do we have room to store the character? */
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if (index >= name_dec_len) {
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return -1;
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}
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/* Yes - store the character. */
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ucname = cname;
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name_dec[index++] = ('A'+((ucname>>4) & 0x0F));
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name_dec[index++] = ('A'+( ucname & 0x0F));
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pname++;
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}
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/* Fill with "space" coding */
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for (;index<name_dec_len-1;) {
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name_dec[index++] = 'C';
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name_dec[index++] = 'A';
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}
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/* Terminate string */
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name_dec[index]='\0';
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return 0;
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}
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/** NetBIOS Name service recv callback */
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static void
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netbios_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p, struct ip_addr *addr, u16_t port)
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{
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LWIP_UNUSED_ARG(arg);
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/* if packet is valid */
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if (p != NULL) {
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char netbios_name[NETBIOS_NAME_LEN+1];
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struct netbios_hdr* netbios_hdr = p->payload;
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struct netbios_name_hdr* netbios_name_hdr = (struct netbios_name_hdr*)(netbios_hdr+1);
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/* we only answer if we got a default interface */
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if (netif_default != NULL) {
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/* @todo: do we need to check answerRRs/authorityRRs/additionalRRs? */
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/* if the packet is a NetBIOS name query question */
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if (((ntohs(netbios_hdr->flags) & NETB_HFLAG_OPCODE) == NETB_HFLAG_OPCODE_NAME_QUERY) &&
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((ntohs(netbios_hdr->flags) & NETB_HFLAG_RESPONSE) == 0) &&
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(ntohs(netbios_hdr->questions) == 1)) {
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/* decode the NetBIOS name */
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netbios_name_decoding( (char*)(netbios_name_hdr->encname), netbios_name, sizeof(netbios_name));
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/* if the packet is for us */
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if (strcmp( netbios_name, NETBIOS_LWIP_NAME)==0) {
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struct pbuf *q;
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struct netbios_resp *resp;
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q = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct netbios_resp), PBUF_RAM);
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if (q != NULL) {
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resp = (struct netbios_resp*)q->payload;
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/* prepare NetBIOS header response */
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resp->resp_hdr.trans_id = netbios_hdr->trans_id;
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resp->resp_hdr.flags = htons(NETB_HFLAG_RESPONSE |
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NETB_HFLAG_OPCODE_NAME_QUERY |
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NETB_HFLAG_AUTHORATIVE |
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NETB_HFLAG_RECURS_DESIRED);
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resp->resp_hdr.questions = 0;
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resp->resp_hdr.answerRRs = htons(1);
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resp->resp_hdr.authorityRRs = 0;
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resp->resp_hdr.additionalRRs = 0;
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/* prepare NetBIOS header datas */
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MEMCPY( resp->resp_name.encname, netbios_name_hdr->encname, sizeof(netbios_name_hdr->encname));
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resp->resp_name.nametype = netbios_name_hdr->nametype;
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resp->resp_name.type = netbios_name_hdr->type;
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resp->resp_name.class = netbios_name_hdr->class;
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resp->resp_name.ttl = htonl(NETBIOS_NAME_TTL);
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resp->resp_name.datalen = htons(sizeof(resp->resp_name.flags)+sizeof(resp->resp_name.addr));
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resp->resp_name.flags = htons(NETB_NFLAG_NODETYPE_BNODE);
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resp->resp_name.addr = netif_default->ip_addr.addr;
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/* send the NetBIOS response */
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udp_sendto(upcb, q, addr, port);
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/* free the "reference" pbuf */
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pbuf_free(q);
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}
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}
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}
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}
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/* free the pbuf */
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pbuf_free(p);
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}
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}
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void netbios_init(void)
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{
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struct udp_pcb *pcb;
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LWIP_ASSERT("NetBIOS name is too long!", strlen(NETBIOS_LWIP_NAME) < NETBIOS_NAME_LEN);
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pcb = udp_new();
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if (pcb != NULL) {
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udp_bind(pcb, IP_ADDR_ANY, NETBIOS_PORT);
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udp_recv(pcb, netbios_recv, pcb);
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}
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}
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#endif /* LWIP_UDP */
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