fe267a5590
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
872 lines
18 KiB
C
872 lines
18 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Written by Atsushi Murai <amurai@spec.co.jp>
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* Copyright (c) 1998, System Planning and Engineering Co.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* TODO:
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* oClean up.
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* oConsidering for word alignment for other platform.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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alias_nbt.c performs special processing for NetBios over TCP/IP
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sessions by UDP.
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Initial version: May, 1998 (Atsushi Murai <amurai@spec.co.jp>)
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See HISTORY file for record of revisions.
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*/
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/* Includes */
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#ifdef _KERNEL
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#else
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#include <errno.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <strings.h>
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#endif
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/udp.h>
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#ifdef _KERNEL
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#include <netinet/libalias/alias_local.h>
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#include <netinet/libalias/alias_mod.h>
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#else
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#include "alias_local.h"
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#include "alias_mod.h"
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#endif
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#define NETBIOS_NS_PORT_NUMBER 137
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#define NETBIOS_DGM_PORT_NUMBER 138
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static int
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AliasHandleUdpNbt(struct libalias *, struct ip *, struct alias_link *,
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struct in_addr *, u_short);
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static int
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AliasHandleUdpNbtNS(struct libalias *, struct ip *, struct alias_link *,
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struct in_addr *, u_short *, struct in_addr *, u_short *);
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static int
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fingerprint1(struct libalias *la, struct alias_data *ah)
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{
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if (ah->dport == NULL || ah->sport == NULL || ah->lnk == NULL ||
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ah->aaddr == NULL || ah->aport == NULL)
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return (-1);
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if (ntohs(*ah->dport) == NETBIOS_DGM_PORT_NUMBER
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|| ntohs(*ah->sport) == NETBIOS_DGM_PORT_NUMBER)
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return (0);
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return (-1);
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}
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static int
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protohandler1(struct libalias *la, struct ip *pip, struct alias_data *ah)
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{
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return (AliasHandleUdpNbt(la, pip, ah->lnk, ah->aaddr, *ah->aport));
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}
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static int
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fingerprint2(struct libalias *la, struct alias_data *ah)
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{
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if (ah->dport == NULL || ah->sport == NULL || ah->lnk == NULL ||
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ah->aaddr == NULL || ah->aport == NULL)
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return (-1);
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if (ntohs(*ah->dport) == NETBIOS_NS_PORT_NUMBER
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|| ntohs(*ah->sport) == NETBIOS_NS_PORT_NUMBER)
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return (0);
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return (-1);
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}
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static int
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protohandler2in(struct libalias *la, struct ip *pip, struct alias_data *ah)
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{
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AliasHandleUdpNbtNS(la, pip, ah->lnk, ah->aaddr, ah->aport,
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ah->oaddr, ah->dport);
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return (0);
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}
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static int
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protohandler2out(struct libalias *la, struct ip *pip, struct alias_data *ah)
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{
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return (AliasHandleUdpNbtNS(la, pip, ah->lnk, &pip->ip_src, ah->sport,
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ah->aaddr, ah->aport));
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}
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/* Kernel module definition. */
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struct proto_handler handlers[] = {
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{
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.pri = 130,
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.dir = IN|OUT,
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.proto = UDP,
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.fingerprint = &fingerprint1,
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.protohandler = &protohandler1
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},
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{
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.pri = 140,
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.dir = IN,
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.proto = UDP,
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.fingerprint = &fingerprint2,
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.protohandler = &protohandler2in
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},
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{
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.pri = 140,
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.dir = OUT,
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.proto = UDP,
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.fingerprint = &fingerprint2,
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.protohandler = &protohandler2out
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},
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{ EOH }
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};
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static int
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mod_handler(module_t mod, int type, void *data)
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{
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int error;
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switch (type) {
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case MOD_LOAD:
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error = 0;
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LibAliasAttachHandlers(handlers);
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break;
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case MOD_UNLOAD:
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error = 0;
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LibAliasDetachHandlers(handlers);
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break;
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default:
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error = EINVAL;
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}
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return (error);
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}
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#ifdef _KERNEL
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static
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#endif
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moduledata_t alias_mod = {
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"alias_nbt", mod_handler, NULL
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};
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#ifdef _KERNEL
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DECLARE_MODULE(alias_nbt, alias_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
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MODULE_VERSION(alias_nbt, 1);
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MODULE_DEPEND(alias_nbt, libalias, 1, 1, 1);
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#endif
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typedef struct {
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struct in_addr oldaddr;
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u_short oldport;
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struct in_addr newaddr;
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u_short newport;
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u_short *uh_sum;
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} NBTArguments;
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typedef struct {
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unsigned char type;
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unsigned char flags;
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u_short id;
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struct in_addr source_ip;
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u_short source_port;
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u_short len;
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u_short offset;
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} NbtDataHeader;
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#define OpQuery 0
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#define OpUnknown 4
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#define OpRegist 5
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#define OpRelease 6
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#define OpWACK 7
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#define OpRefresh 8
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typedef struct {
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u_short nametrid;
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u_short dir: 1, opcode:4, nmflags:7, rcode:4;
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u_short qdcount;
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u_short ancount;
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u_short nscount;
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u_short arcount;
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} NbtNSHeader;
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#define FMT_ERR 0x1
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#define SRV_ERR 0x2
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#define IMP_ERR 0x4
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#define RFS_ERR 0x5
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#define ACT_ERR 0x6
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#define CFT_ERR 0x7
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#ifdef LIBALIAS_DEBUG
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static void
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PrintRcode(u_char rcode)
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{
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switch (rcode) {
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case FMT_ERR:
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printf("\nFormat Error.");
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case SRV_ERR:
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printf("\nSever failure.");
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case IMP_ERR:
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printf("\nUnsupported request error.\n");
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case RFS_ERR:
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printf("\nRefused error.\n");
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case ACT_ERR:
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printf("\nActive error.\n");
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case CFT_ERR:
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printf("\nName in conflict error.\n");
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default:
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printf("\n?%c?=%0x\n", '?', rcode);
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}
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}
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#endif
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/* Handling Name field */
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static u_char *
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AliasHandleName(u_char * p, char *pmax)
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{
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u_char *s;
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u_char c;
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int compress;
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/* Following length field */
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if (p == NULL || (char *)p >= pmax)
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return (NULL);
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if (*p & 0xc0) {
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p = p + 2;
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if ((char *)p > pmax)
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return (NULL);
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return ((u_char *) p);
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}
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while ((*p & 0x3f) != 0x00) {
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s = p + 1;
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if (*p == 0x20)
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compress = 1;
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else
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compress = 0;
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/* Get next length field */
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p = (u_char *) (p + (*p & 0x3f) + 1);
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if ((char *)p > pmax) {
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p = NULL;
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break;
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}
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#ifdef LIBALIAS_DEBUG
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printf(":");
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#endif
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while (s < p) {
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if (compress == 1) {
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c = (u_char) (((((*s & 0x0f) << 4) | (*(s + 1) & 0x0f)) - 0x11));
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#ifdef LIBALIAS_DEBUG
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if (isprint(c))
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printf("%c", c);
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else
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printf("<0x%02x>", c);
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#endif
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s += 2;
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} else {
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#ifdef LIBALIAS_DEBUG
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printf("%c", *s);
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#endif
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s++;
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}
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}
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#ifdef LIBALIAS_DEBUG
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printf(":");
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fflush(stdout);
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#endif
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}
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/* Set up to out of Name field */
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if (p == NULL || (char *)p >= pmax)
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p = NULL;
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else
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p++;
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return ((u_char *) p);
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}
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/*
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* NetBios Datagram Handler (IP/UDP)
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*/
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#define DGM_DIRECT_UNIQ 0x10
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#define DGM_DIRECT_GROUP 0x11
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#define DGM_BROADCAST 0x12
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#define DGM_ERROR 0x13
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#define DGM_QUERY 0x14
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#define DGM_POSITIVE_RES 0x15
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#define DGM_NEGATIVE_RES 0x16
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static int
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AliasHandleUdpNbt(
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struct libalias *la,
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struct ip *pip, /* IP packet to examine/patch */
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struct alias_link *lnk,
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struct in_addr *alias_address,
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u_short alias_port
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)
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{
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struct udphdr *uh;
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NbtDataHeader *ndh;
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u_char *p = NULL;
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char *pmax;
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#ifdef LIBALIAS_DEBUG
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char addrbuf[INET_ADDRSTRLEN];
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#endif
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(void)la;
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(void)lnk;
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/* Calculate data length of UDP packet */
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uh = (struct udphdr *)ip_next(pip);
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pmax = (char *)uh + ntohs(uh->uh_ulen);
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ndh = (NbtDataHeader *)udp_next(uh);
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if ((char *)(ndh + 1) > pmax)
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return (-1);
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#ifdef LIBALIAS_DEBUG
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printf("\nType=%02x,", ndh->type);
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#endif
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switch (ndh->type) {
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case DGM_DIRECT_UNIQ:
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case DGM_DIRECT_GROUP:
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case DGM_BROADCAST:
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p = (u_char *) ndh + 14;
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p = AliasHandleName(p, pmax); /* Source Name */
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p = AliasHandleName(p, pmax); /* Destination Name */
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break;
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case DGM_ERROR:
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p = (u_char *) ndh + 11;
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break;
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case DGM_QUERY:
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case DGM_POSITIVE_RES:
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case DGM_NEGATIVE_RES:
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p = (u_char *) ndh + 10;
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p = AliasHandleName(p, pmax); /* Destination Name */
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break;
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}
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if (p == NULL || (char *)p > pmax)
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p = NULL;
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#ifdef LIBALIAS_DEBUG
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printf("%s:%d-->", inet_ntoa_r(ndh->source_ip, INET_NTOA_BUF(addrbuf)),
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ntohs(ndh->source_port));
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#endif
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/* Doing an IP address and Port number Translation */
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if (uh->uh_sum != 0) {
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int acc;
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u_short *sptr;
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acc = ndh->source_port;
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acc -= alias_port;
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sptr = (u_short *) & (ndh->source_ip);
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acc += *sptr++;
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acc += *sptr;
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sptr = (u_short *) alias_address;
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acc -= *sptr++;
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acc -= *sptr;
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ADJUST_CHECKSUM(acc, uh->uh_sum);
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}
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ndh->source_ip = *alias_address;
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ndh->source_port = alias_port;
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#ifdef LIBALIAS_DEBUG
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printf("%s:%d\n", inet_ntoa_r(ndh->source_ip, INET_NTOA_BUF(addrbuf)),
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ntohs(ndh->source_port));
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fflush(stdout);
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#endif
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return ((p == NULL) ? -1 : 0);
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}
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/* Question Section */
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#define QS_TYPE_NB 0x0020
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#define QS_TYPE_NBSTAT 0x0021
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#define QS_CLAS_IN 0x0001
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typedef struct {
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u_short type; /* The type of Request */
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u_short class; /* The class of Request */
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} NBTNsQuestion;
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static u_char *
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AliasHandleQuestion(
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u_short count,
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NBTNsQuestion * q,
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char *pmax,
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NBTArguments * nbtarg)
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{
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(void)nbtarg;
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while (count != 0) {
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/* Name Filed */
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q = (NBTNsQuestion *) AliasHandleName((u_char *) q, pmax);
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if (q == NULL || (char *)(q + 1) > pmax) {
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q = NULL;
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break;
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}
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/* Type and Class filed */
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switch (ntohs(q->type)) {
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case QS_TYPE_NB:
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case QS_TYPE_NBSTAT:
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q = q + 1;
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break;
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default:
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#ifdef LIBALIAS_DEBUG
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printf("\nUnknown Type on Question %0x\n", ntohs(q->type));
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#endif
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break;
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}
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count--;
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}
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/* Set up to out of Question Section */
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return ((u_char *) q);
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}
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/* Resource Record */
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#define RR_TYPE_A 0x0001
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#define RR_TYPE_NS 0x0002
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#define RR_TYPE_NULL 0x000a
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#define RR_TYPE_NB 0x0020
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#define RR_TYPE_NBSTAT 0x0021
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#define RR_CLAS_IN 0x0001
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#define SizeOfNsResource 8
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typedef struct {
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u_short type;
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u_short class;
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unsigned int ttl;
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u_short rdlen;
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} NBTNsResource;
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#define SizeOfNsRNB 6
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typedef struct {
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u_short g: 1 , ont:2, resv:13;
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struct in_addr addr;
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} NBTNsRNB;
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static u_char *
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AliasHandleResourceNB(
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NBTNsResource * q,
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char *pmax,
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NBTArguments * nbtarg)
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{
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NBTNsRNB *nb;
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u_short bcount;
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#ifdef LIBALIAS_DEBUG
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char oldbuf[INET_ADDRSTRLEN];
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char newbuf[INET_ADDRSTRLEN];
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#endif
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if (q == NULL || (char *)(q + 1) > pmax)
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return (NULL);
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/* Check out a length */
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bcount = ntohs(q->rdlen);
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/* Forward to Resource NB position */
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nb = (NBTNsRNB *) ((u_char *) q + SizeOfNsResource);
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/* Processing all in_addr array */
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#ifdef LIBALIAS_DEBUG
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printf("NB rec[%s->%s, %dbytes] ",
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inet_ntoa_r(nbtarg->oldaddr, INET_NTOA_BUF(oldbuf)),
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inet_ntoa_r(nbtarg->newaddr, INET_NTOA_BUF(newbuf)),
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bcount);
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#endif
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while (nb != NULL && bcount != 0) {
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if ((char *)(nb + 1) > pmax) {
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nb = NULL;
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break;
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}
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#ifdef LIBALIAS_DEBUG
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printf("<%s>", inet_ntoa_r(nb->addr, INET_NTOA_BUF(newbuf)));
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#endif
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if (!bcmp(&nbtarg->oldaddr, &nb->addr, sizeof(struct in_addr))) {
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if (*nbtarg->uh_sum != 0) {
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int acc;
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u_short *sptr;
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sptr = (u_short *) & (nb->addr);
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acc = *sptr++;
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acc += *sptr;
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sptr = (u_short *) & (nbtarg->newaddr);
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acc -= *sptr++;
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acc -= *sptr;
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ADJUST_CHECKSUM(acc, *nbtarg->uh_sum);
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}
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nb->addr = nbtarg->newaddr;
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#ifdef LIBALIAS_DEBUG
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printf("O");
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#endif
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}
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#ifdef LIBALIAS_DEBUG
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else {
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printf(".");
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}
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#endif
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nb = (NBTNsRNB *) ((u_char *) nb + SizeOfNsRNB);
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bcount -= SizeOfNsRNB;
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}
|
|
if (nb == NULL || (char *)(nb + 1) > pmax) {
|
|
nb = NULL;
|
|
}
|
|
return ((u_char *) nb);
|
|
}
|
|
|
|
#define SizeOfResourceA 6
|
|
typedef struct {
|
|
struct in_addr addr;
|
|
} NBTNsResourceA;
|
|
|
|
static u_char *
|
|
AliasHandleResourceA(
|
|
NBTNsResource * q,
|
|
char *pmax,
|
|
NBTArguments * nbtarg)
|
|
{
|
|
NBTNsResourceA *a;
|
|
u_short bcount;
|
|
#ifdef LIBALIAS_DEBUG
|
|
char oldbuf[INET_ADDRSTRLEN];
|
|
char newbuf[INET_ADDRSTRLEN];
|
|
#endif
|
|
|
|
if (q == NULL || (char *)(q + 1) > pmax)
|
|
return (NULL);
|
|
|
|
/* Forward to Resource A position */
|
|
a = (NBTNsResourceA *) ((u_char *) q + sizeof(NBTNsResource));
|
|
|
|
/* Check out of length */
|
|
bcount = ntohs(q->rdlen);
|
|
|
|
/* Processing all in_addr array */
|
|
#ifdef LIBALIAS_DEBUG
|
|
printf("Arec [%s->%s]",
|
|
inet_ntoa_r(nbtarg->oldaddr, INET_NTOA_BUF(oldbuf)),
|
|
inet_ntoa_r(nbtarg->newaddr, INET_NTOA_BUF(newbuf)));
|
|
#endif
|
|
while (bcount != 0) {
|
|
if (a == NULL || (char *)(a + 1) > pmax)
|
|
return (NULL);
|
|
#ifdef LIBALIAS_DEBUG
|
|
printf("..%s", inet_ntoa_r(a->addr, INET_NTOA_BUF(newbuf)));
|
|
#endif
|
|
if (!bcmp(&nbtarg->oldaddr, &a->addr, sizeof(struct in_addr))) {
|
|
if (*nbtarg->uh_sum != 0) {
|
|
int acc;
|
|
u_short *sptr;
|
|
|
|
sptr = (u_short *) & (a->addr); /* Old */
|
|
acc = *sptr++;
|
|
acc += *sptr;
|
|
sptr = (u_short *) & nbtarg->newaddr; /* New */
|
|
acc -= *sptr++;
|
|
acc -= *sptr;
|
|
ADJUST_CHECKSUM(acc, *nbtarg->uh_sum);
|
|
}
|
|
a->addr = nbtarg->newaddr;
|
|
}
|
|
a++; /* XXXX */
|
|
bcount -= SizeOfResourceA;
|
|
}
|
|
if (a == NULL || (char *)(a + 1) > pmax)
|
|
a = NULL;
|
|
return ((u_char *) a);
|
|
}
|
|
|
|
typedef struct {
|
|
u_short opcode:4, flags:8, resv:4;
|
|
} NBTNsResourceNULL;
|
|
|
|
static u_char *
|
|
AliasHandleResourceNULL(
|
|
NBTNsResource * q,
|
|
char *pmax,
|
|
NBTArguments * nbtarg)
|
|
{
|
|
NBTNsResourceNULL *n;
|
|
u_short bcount;
|
|
|
|
(void)nbtarg;
|
|
|
|
if (q == NULL || (char *)(q + 1) > pmax)
|
|
return (NULL);
|
|
|
|
/* Forward to Resource NULL position */
|
|
n = (NBTNsResourceNULL *) ((u_char *) q + sizeof(NBTNsResource));
|
|
|
|
/* Check out of length */
|
|
bcount = ntohs(q->rdlen);
|
|
|
|
/* Processing all in_addr array */
|
|
while (bcount != 0) {
|
|
if ((char *)(n + 1) > pmax) {
|
|
n = NULL;
|
|
break;
|
|
}
|
|
n++;
|
|
bcount -= sizeof(NBTNsResourceNULL);
|
|
}
|
|
if ((char *)(n + 1) > pmax)
|
|
n = NULL;
|
|
|
|
return ((u_char *) n);
|
|
}
|
|
|
|
static u_char *
|
|
AliasHandleResourceNS(
|
|
NBTNsResource * q,
|
|
char *pmax,
|
|
NBTArguments * nbtarg)
|
|
{
|
|
NBTNsResourceNULL *n;
|
|
u_short bcount;
|
|
|
|
(void)nbtarg;
|
|
|
|
if (q == NULL || (char *)(q + 1) > pmax)
|
|
return (NULL);
|
|
|
|
/* Forward to Resource NULL position */
|
|
n = (NBTNsResourceNULL *) ((u_char *) q + sizeof(NBTNsResource));
|
|
|
|
/* Check out of length */
|
|
bcount = ntohs(q->rdlen);
|
|
|
|
/* Resource Record Name Filed */
|
|
q = (NBTNsResource *) AliasHandleName((u_char *) n, pmax); /* XXX */
|
|
|
|
if (q == NULL || (char *)((u_char *) n + bcount) > pmax)
|
|
return (NULL);
|
|
else
|
|
return ((u_char *) n + bcount);
|
|
}
|
|
|
|
typedef struct {
|
|
u_short numnames;
|
|
} NBTNsResourceNBSTAT;
|
|
|
|
static u_char *
|
|
AliasHandleResourceNBSTAT(
|
|
NBTNsResource * q,
|
|
char *pmax,
|
|
NBTArguments * nbtarg)
|
|
{
|
|
NBTNsResourceNBSTAT *n;
|
|
u_short bcount;
|
|
|
|
(void)nbtarg;
|
|
|
|
if (q == NULL || (char *)(q + 1) > pmax)
|
|
return (NULL);
|
|
|
|
/* Forward to Resource NBSTAT position */
|
|
n = (NBTNsResourceNBSTAT *) ((u_char *) q + sizeof(NBTNsResource));
|
|
|
|
/* Check out of length */
|
|
bcount = ntohs(q->rdlen);
|
|
|
|
if (q == NULL || (char *)((u_char *) n + bcount) > pmax)
|
|
return (NULL);
|
|
else
|
|
return ((u_char *) n + bcount);
|
|
}
|
|
|
|
static u_char *
|
|
AliasHandleResource(
|
|
u_short count,
|
|
NBTNsResource * q,
|
|
char *pmax,
|
|
NBTArguments
|
|
* nbtarg)
|
|
{
|
|
while (count != 0) {
|
|
/* Resource Record Name Filed */
|
|
q = (NBTNsResource *) AliasHandleName((u_char *) q, pmax);
|
|
|
|
if (q == NULL || (char *)(q + 1) > pmax)
|
|
break;
|
|
#ifdef LIBALIAS_DEBUG
|
|
printf("type=%02x, count=%d\n", ntohs(q->type), count);
|
|
#endif
|
|
|
|
/* Type and Class filed */
|
|
switch (ntohs(q->type)) {
|
|
case RR_TYPE_NB:
|
|
q = (NBTNsResource *) AliasHandleResourceNB(
|
|
q,
|
|
pmax,
|
|
nbtarg
|
|
);
|
|
break;
|
|
case RR_TYPE_A:
|
|
q = (NBTNsResource *) AliasHandleResourceA(
|
|
q,
|
|
pmax,
|
|
nbtarg
|
|
);
|
|
break;
|
|
case RR_TYPE_NS:
|
|
q = (NBTNsResource *) AliasHandleResourceNS(
|
|
q,
|
|
pmax,
|
|
nbtarg
|
|
);
|
|
break;
|
|
case RR_TYPE_NULL:
|
|
q = (NBTNsResource *) AliasHandleResourceNULL(
|
|
q,
|
|
pmax,
|
|
nbtarg
|
|
);
|
|
break;
|
|
case RR_TYPE_NBSTAT:
|
|
q = (NBTNsResource *) AliasHandleResourceNBSTAT(
|
|
q,
|
|
pmax,
|
|
nbtarg
|
|
);
|
|
break;
|
|
default:
|
|
#ifdef LIBALIAS_DEBUG
|
|
printf(
|
|
"\nUnknown Type of Resource %0x\n",
|
|
ntohs(q->type)
|
|
);
|
|
fflush(stdout);
|
|
#endif
|
|
break;
|
|
}
|
|
count--;
|
|
}
|
|
return ((u_char *) q);
|
|
}
|
|
|
|
static int
|
|
AliasHandleUdpNbtNS(
|
|
struct libalias *la,
|
|
struct ip *pip, /* IP packet to examine/patch */
|
|
struct alias_link *lnk,
|
|
struct in_addr *alias_address,
|
|
u_short * alias_port,
|
|
struct in_addr *original_address,
|
|
u_short * original_port)
|
|
{
|
|
struct udphdr *uh;
|
|
NbtNSHeader *nsh;
|
|
u_char *p;
|
|
char *pmax;
|
|
NBTArguments nbtarg;
|
|
|
|
(void)la;
|
|
(void)lnk;
|
|
|
|
/* Set up Common Parameter */
|
|
nbtarg.oldaddr = *alias_address;
|
|
nbtarg.oldport = *alias_port;
|
|
nbtarg.newaddr = *original_address;
|
|
nbtarg.newport = *original_port;
|
|
|
|
/* Calculate data length of UDP packet */
|
|
uh = (struct udphdr *)ip_next(pip);
|
|
nbtarg.uh_sum = &(uh->uh_sum);
|
|
nsh = (NbtNSHeader *)udp_next(uh);
|
|
p = (u_char *) (nsh + 1);
|
|
pmax = (char *)uh + ntohs(uh->uh_ulen);
|
|
|
|
if ((char *)(nsh + 1) > pmax)
|
|
return (-1);
|
|
|
|
#ifdef LIBALIAS_DEBUG
|
|
printf(" [%s] ID=%02x, op=%01x, flag=%02x, rcode=%01x, qd=%04x"
|
|
", an=%04x, ns=%04x, ar=%04x, [%d]-->",
|
|
nsh->dir ? "Response" : "Request",
|
|
nsh->nametrid,
|
|
nsh->opcode,
|
|
nsh->nmflags,
|
|
nsh->rcode,
|
|
ntohs(nsh->qdcount),
|
|
ntohs(nsh->ancount),
|
|
ntohs(nsh->nscount),
|
|
ntohs(nsh->arcount),
|
|
(u_char *) p - (u_char *) nsh
|
|
);
|
|
#endif
|
|
|
|
/* Question Entries */
|
|
if (ntohs(nsh->qdcount) != 0) {
|
|
p = AliasHandleQuestion(
|
|
ntohs(nsh->qdcount),
|
|
(NBTNsQuestion *) p,
|
|
pmax,
|
|
&nbtarg
|
|
);
|
|
}
|
|
/* Answer Resource Records */
|
|
if (ntohs(nsh->ancount) != 0) {
|
|
p = AliasHandleResource(
|
|
ntohs(nsh->ancount),
|
|
(NBTNsResource *) p,
|
|
pmax,
|
|
&nbtarg
|
|
);
|
|
}
|
|
/* Authority Resource Recodrs */
|
|
if (ntohs(nsh->nscount) != 0) {
|
|
p = AliasHandleResource(
|
|
ntohs(nsh->nscount),
|
|
(NBTNsResource *) p,
|
|
pmax,
|
|
&nbtarg
|
|
);
|
|
}
|
|
/* Additional Resource Recodrs */
|
|
if (ntohs(nsh->arcount) != 0) {
|
|
p = AliasHandleResource(
|
|
ntohs(nsh->arcount),
|
|
(NBTNsResource *) p,
|
|
pmax,
|
|
&nbtarg
|
|
);
|
|
}
|
|
#ifdef LIBALIAS_DEBUG
|
|
PrintRcode(nsh->rcode);
|
|
#endif
|
|
return ((p == NULL) ? -1 : 0);
|
|
}
|