forked from chunyexixiaoyu/xiuos
534 lines
19 KiB
C
534 lines
19 KiB
C
/**
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* @file
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* NetBIOS name service responder
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*/
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/**
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* @defgroup netbiosns NETBIOS responder
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* @ingroup apps
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*
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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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/*
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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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* Modifications by Ray Abram to respond to NetBIOS name requests when Incoming name = *
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* - based on code from "https://github.com/esp8266/Arduino/commit/1f7989b31d26d7df9776a08f36d685eae7ac8f99"
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* - with permission to relicense to BSD from original author:
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* http://www.xpablo.cz/?p=751#more-751
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*/
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#include "lwip/apps/netbiosns.h"
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#if LWIP_IPV4 && LWIP_UDP /* don't build if not configured for use in lwipopts.h */
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#include "lwip/def.h"
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#include "lwip/udp.h"
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#include "lwip/ip.h"
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#include "lwip/netif.h"
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#include "lwip/prot/iana.h"
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#include <string.h>
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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 300000u
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/** NetBIOS header flags */
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#define NETB_HFLAG_RESPONSE 0x8000U
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#define NETB_HFLAG_OPCODE 0x7800U
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#define NETB_HFLAG_OPCODE_NAME_QUERY 0x0000U
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#define NETB_HFLAG_AUTHORATIVE 0x0400U
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#define NETB_HFLAG_TRUNCATED 0x0200U
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#define NETB_HFLAG_RECURS_DESIRED 0x0100U
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#define NETB_HFLAG_RECURS_AVAILABLE 0x0080U
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#define NETB_HFLAG_BROADCAST 0x0010U
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#define NETB_HFLAG_REPLYCODE 0x0008U
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#define NETB_HFLAG_REPLYCODE_NOERROR 0x0000U
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/* NetBIOS question types */
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#define NETB_QTYPE_NB 0x0020U
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#define NETB_QTYPE_NBSTAT 0x0021U
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/** NetBIOS name flags */
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#define NETB_NFLAG_UNIQUE 0x8000U
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#define NETB_NFLAG_NODETYPE 0x6000U
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#define NETB_NFLAG_NODETYPE_HNODE 0x6000U
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#define NETB_NFLAG_NODETYPE_MNODE 0x4000U
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#define NETB_NFLAG_NODETYPE_PNODE 0x2000U
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#define NETB_NFLAG_NODETYPE_BNODE 0x0000U
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#define NETB_NFLAG_NAME_IN_CONFLICT 0x0800U /* 1=Yes, 0=No */
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#define NETB_NFLAG_NAME_IS_ACTIVE 0x0400U /* 1=Yes, 0=No */
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#define NETB_NFLAG_NAME_IS_PERMANENT 0x0200U /* 1=Yes (Name is Permanent Node Name), 0=No */
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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 question 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_question_hdr {
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PACK_STRUCT_FLD_8(u8_t nametype);
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PACK_STRUCT_FLD_8(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 cls);
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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_FLD_8(u8_t nametype);
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PACK_STRUCT_FLD_8(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 cls);
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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_FLD_S(ip4_addr_p_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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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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/** The NBNS Structure Responds to a Name Query */
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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_answer {
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struct netbios_hdr answer_hdr;
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/** the length of the next string */
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PACK_STRUCT_FIELD(u8_t name_size);
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/** WARNING!!! this item may be of a different length (we use this struct for transmission) */
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PACK_STRUCT_FLD_8(u8_t query_name[(NETBIOS_NAME_LEN * 2) + 1]);
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PACK_STRUCT_FIELD(u16_t packet_type);
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PACK_STRUCT_FIELD(u16_t cls);
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PACK_STRUCT_FIELD(u32_t ttl);
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PACK_STRUCT_FIELD(u16_t data_length);
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#define OFFSETOF_STRUCT_NETBIOS_ANSWER_NUMBER_OF_NAMES 56
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/** number of names */
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PACK_STRUCT_FLD_8(u8_t number_of_names);
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/** node name */
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PACK_STRUCT_FLD_8(u8_t answer_name[NETBIOS_NAME_LEN]);
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/** node flags */
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PACK_STRUCT_FIELD(u16_t answer_name_flags);
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/** Unit ID */
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PACK_STRUCT_FLD_8(u8_t unit_id[6]);
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/** Jumpers */
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PACK_STRUCT_FLD_8(u8_t jumpers);
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/** Test result */
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PACK_STRUCT_FLD_8(u8_t test_result);
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/** Version number */
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PACK_STRUCT_FIELD(u16_t version_number);
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/** Period of statistics */
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PACK_STRUCT_FIELD(u16_t period_of_statistics);
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/** Statistics */
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PACK_STRUCT_FIELD(u16_t number_of_crcs);
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/** Statistics */
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PACK_STRUCT_FIELD(u16_t number_of_alignment_errors);
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/** Statistics */
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PACK_STRUCT_FIELD(u16_t number_of_collisions);
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/** Statistics */
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PACK_STRUCT_FIELD(u16_t number_of_send_aborts);
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/** Statistics */
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PACK_STRUCT_FIELD(u32_t number_of_good_sends);
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/** Statistics */
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PACK_STRUCT_FIELD(u32_t number_of_good_receives);
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/** Statistics */
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PACK_STRUCT_FIELD(u16_t number_of_retransmits);
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/** Statistics */
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PACK_STRUCT_FIELD(u16_t number_of_no_resource_condition);
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/** Statistics */
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PACK_STRUCT_FIELD(u16_t number_of_free_command_blocks);
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/** Statistics */
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PACK_STRUCT_FIELD(u16_t total_number_of_command_blocks);
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/** Statistics */
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PACK_STRUCT_FIELD(u16_t max_total_number_of_command_blocks);
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/** Statistics */
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PACK_STRUCT_FIELD(u16_t number_of_pending_sessions);
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/** Statistics */
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PACK_STRUCT_FIELD(u16_t max_number_of_pending_sessions);
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/** Statistics */
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PACK_STRUCT_FIELD(u16_t max_total_sessions_possible);
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/** Statistics */
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PACK_STRUCT_FIELD(u16_t session_data_packet_size);
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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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#ifdef NETBIOS_LWIP_NAME
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#define NETBIOS_LOCAL_NAME NETBIOS_LWIP_NAME
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#else
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static char netbiosns_local_name[NETBIOS_NAME_LEN];
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#define NETBIOS_LOCAL_NAME netbiosns_local_name
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#endif
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static struct udp_pcb *netbiosns_pcb;
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/** Decode a NetBIOS name (from packet to string) */
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static int
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netbiosns_name_decode(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 idx = 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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}
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if (cname == '.') {
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break; /* scope ID follows */
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}
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if (!lwip_isupper(cname)) {
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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 (!lwip_isupper(cname)) {
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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 (idx < NETBIOS_NAME_LEN) {
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/* Yes - store the character. */
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name_dec[idx++] = (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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#if 0 /* function currently unused */
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/** Encode a NetBIOS name (from string to packet) - currently unused because
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we don't ask for names. */
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static int
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netbiosns_name_encode(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 idx = 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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}
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if (cname == '.') {
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break; /* scope ID follows */
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}
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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 (idx >= 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[idx++] = ('A' + ((ucname >> 4) & 0x0F));
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name_dec[idx++] = ('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 (; idx < name_dec_len - 1;) {
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name_dec[idx++] = 'C';
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name_dec[idx++] = 'A';
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}
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/* Terminate string */
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name_dec[idx] = '\0';
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return 0;
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}
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#endif /* 0 */
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/** NetBIOS Name service recv callback */
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static void
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netbiosns_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t *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 = (struct netbios_hdr *)p->payload;
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struct netbios_question_hdr *netbios_question_hdr = (struct netbios_question_hdr *)(netbios_hdr + 1);
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/* is the packet long enough (we need the header in one piece) */
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if (p->len < (sizeof(struct netbios_hdr) + sizeof(struct netbios_question_hdr))) {
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/* packet too short */
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pbuf_free(p);
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return;
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}
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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 (((netbios_hdr->flags & PP_NTOHS(NETB_HFLAG_OPCODE)) == PP_NTOHS(NETB_HFLAG_OPCODE_NAME_QUERY)) &&
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((netbios_hdr->flags & PP_NTOHS(NETB_HFLAG_RESPONSE)) == 0) &&
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(netbios_hdr->questions == PP_NTOHS(1))) {
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/* decode the NetBIOS name */
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netbiosns_name_decode((char *)(netbios_question_hdr->encname), netbios_name, sizeof(netbios_name));
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/* check the request type */
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if (netbios_question_hdr->type == PP_HTONS(NETB_QTYPE_NB)) {
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/* if the packet is for us */
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if (lwip_strnicmp(netbios_name, NETBIOS_LOCAL_NAME, sizeof(NETBIOS_LOCAL_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 = PP_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 = PP_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_question_hdr->encname, sizeof(netbios_question_hdr->encname));
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resp->resp_name.nametype = netbios_question_hdr->nametype;
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resp->resp_name.type = netbios_question_hdr->type;
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resp->resp_name.cls = netbios_question_hdr->cls;
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resp->resp_name.ttl = PP_HTONL(NETBIOS_NAME_TTL);
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resp->resp_name.datalen = PP_HTONS(sizeof(resp->resp_name.flags) + sizeof(resp->resp_name.addr));
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resp->resp_name.flags = PP_HTONS(NETB_NFLAG_NODETYPE_BNODE);
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ip4_addr_copy(resp->resp_name.addr, *netif_ip4_addr(netif_default));
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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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#if LWIP_NETBIOS_RESPOND_NAME_QUERY
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} else if (netbios_question_hdr->type == PP_HTONS(NETB_QTYPE_NBSTAT)) {
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/* if the packet is for us or general query */
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if (!lwip_strnicmp(netbios_name, NETBIOS_LOCAL_NAME, sizeof(NETBIOS_LOCAL_NAME)) ||
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!lwip_strnicmp(netbios_name, "*", sizeof(NETBIOS_LOCAL_NAME))) {
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/* general query - ask for our IP address */
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struct pbuf *q;
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struct netbios_answer *resp;
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q = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct netbios_answer), PBUF_RAM);
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if (q != NULL) {
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/* buffer to which a response is compiled */
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resp = (struct netbios_answer *) q->payload;
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/* Init response to zero, especially the statistics fields */
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memset(resp, 0, sizeof(*resp));
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/* copy the query to the response ID */
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resp->answer_hdr.trans_id = netbios_hdr->trans_id;
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/* acknowledgment of termination */
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resp->answer_hdr.flags = PP_HTONS(NETB_HFLAG_RESPONSE | NETB_HFLAG_OPCODE_NAME_QUERY | NETB_HFLAG_AUTHORATIVE);
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/* resp->answer_hdr.questions = PP_HTONS(0); done by memset() */
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/* serial number of the answer */
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resp->answer_hdr.answerRRs = PP_HTONS(1);
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/* resp->answer_hdr.authorityRRs = PP_HTONS(0); done by memset() */
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/* resp->answer_hdr.additionalRRs = PP_HTONS(0); done by memset() */
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/* we will copy the length of the station name */
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resp->name_size = netbios_question_hdr->nametype;
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/* we will copy the queried name */
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MEMCPY(resp->query_name, netbios_question_hdr->encname, (NETBIOS_NAME_LEN * 2) + 1);
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/* NBSTAT */
|
|
resp->packet_type = PP_HTONS(0x21);
|
|
/* Internet name */
|
|
resp->cls = PP_HTONS(1);
|
|
/* resp->ttl = PP_HTONL(0); done by memset() */
|
|
resp->data_length = PP_HTONS(sizeof(struct netbios_answer) - offsetof(struct netbios_answer, number_of_names));
|
|
resp->number_of_names = 1;
|
|
|
|
/* make windows see us as workstation, not as a server */
|
|
memset(resp->answer_name, 0x20, NETBIOS_NAME_LEN - 1);
|
|
/* strlen is checked to be < NETBIOS_NAME_LEN during initialization */
|
|
MEMCPY(resp->answer_name, NETBIOS_LOCAL_NAME, strlen(NETBIOS_LOCAL_NAME));
|
|
|
|
/* b-node, unique, active */
|
|
resp->answer_name_flags = PP_HTONS(NETB_NFLAG_NAME_IS_ACTIVE);
|
|
|
|
/* Set responder netif MAC address */
|
|
SMEMCPY(resp->unit_id, ip_current_input_netif()->hwaddr, sizeof(resp->unit_id));
|
|
|
|
udp_sendto(upcb, q, addr, port);
|
|
pbuf_free(q);
|
|
}
|
|
}
|
|
#endif /* LWIP_NETBIOS_RESPOND_NAME_QUERY */
|
|
}
|
|
}
|
|
}
|
|
/* free the pbuf */
|
|
pbuf_free(p);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @ingroup netbiosns
|
|
* Init netbios responder
|
|
*/
|
|
void
|
|
netbiosns_init(void)
|
|
{
|
|
/* LWIP_ASSERT_CORE_LOCKED(); is checked by udp_new() */
|
|
#ifdef NETBIOS_LWIP_NAME
|
|
LWIP_ASSERT("NetBIOS name is too long!", strlen(NETBIOS_LWIP_NAME) < NETBIOS_NAME_LEN);
|
|
#endif
|
|
|
|
netbiosns_pcb = udp_new_ip_type(IPADDR_TYPE_ANY);
|
|
if (netbiosns_pcb != NULL) {
|
|
/* we have to be allowed to send broadcast packets! */
|
|
ip_set_option(netbiosns_pcb, SOF_BROADCAST);
|
|
udp_bind(netbiosns_pcb, IP_ANY_TYPE, LWIP_IANA_PORT_NETBIOS);
|
|
udp_recv(netbiosns_pcb, netbiosns_recv, netbiosns_pcb);
|
|
}
|
|
}
|
|
|
|
#ifndef NETBIOS_LWIP_NAME
|
|
/**
|
|
* @ingroup netbiosns
|
|
* Set netbios name. ATTENTION: the hostname must be less than 15 characters!
|
|
* the NetBIOS name spec says the name MUST be upper case, so incoming name is forced into uppercase :-)
|
|
*/
|
|
void
|
|
netbiosns_set_name(const char *hostname)
|
|
{
|
|
size_t i;
|
|
size_t copy_len = strlen(hostname);
|
|
LWIP_ASSERT_CORE_LOCKED();
|
|
LWIP_ASSERT("NetBIOS name is too long!", copy_len < NETBIOS_NAME_LEN);
|
|
if (copy_len >= NETBIOS_NAME_LEN) {
|
|
copy_len = NETBIOS_NAME_LEN - 1;
|
|
}
|
|
|
|
/* make name into upper case */
|
|
for (i = 0; i < copy_len; i++ ) {
|
|
netbiosns_local_name[i] = (char)lwip_toupper(hostname[i]);
|
|
}
|
|
netbiosns_local_name[copy_len] = '\0';
|
|
}
|
|
#endif /* NETBIOS_LWIP_NAME */
|
|
|
|
/**
|
|
* @ingroup netbiosns
|
|
* Stop netbios responder
|
|
*/
|
|
void
|
|
netbiosns_stop(void)
|
|
{
|
|
LWIP_ASSERT_CORE_LOCKED();
|
|
if (netbiosns_pcb != NULL) {
|
|
udp_remove(netbiosns_pcb);
|
|
netbiosns_pcb = NULL;
|
|
}
|
|
}
|
|
|
|
#endif /* LWIP_IPV4 && LWIP_UDP */
|