Primary verison of NetBIOS over TCP/IP. Now you can connect Windows
DOMAIN as DOMAIN user through NAT function. See also RFC1002 for futher detail of SMB structure. Submitted by: Atsushi Murai <amurai@spec.co.jp>
This commit is contained in:
Atsushi Murai
parent
461497b337
commit
fb9cd36d0d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=36321
@ -124,3 +124,6 @@ Version 2.5: December, 1997 (ee)
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- Added PKT_ALIAS_PUNCH_FW mode for firewall
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bypass of FTP/IRC DCC data connections. Also added
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improved TCP connection monitoring.
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Version 2.6: May, 1998 (amurai)
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- Added supporting routine for NetBios over TCP/IP.
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@ -2,7 +2,9 @@ LIB= alias
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SHLIB_MAJOR= 2
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SHLIB_MINOR= 5
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CFLAGS+=-Wall -I${.CURDIR}
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SRCS= alias.c alias_db.c alias_ftp.c alias_irc.c alias_util.c alias_old.c
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SRCS= alias.c alias_db.c alias_ftp.c alias_irc.c alias_util.c alias_old.c \
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alias_nbt.c
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MAN3=libalias.3
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beforeinstall:
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@ -93,6 +93,9 @@
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#include "alias_local.h"
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#include "alias.h"
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#define NETBIOS_NS_PORT_NUMBER 137
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#define NETBIOS_DGM_PORT_NUMBER 138
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#define FTP_CONTROL_PORT_NUMBER 21
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#define FTP_CONTROL_PORT_NUMBER 21
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#define IRC_CONTROL_PORT_NUMBER_1 6667
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#define IRC_CONTROL_PORT_NUMBER_2 6668
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@ -318,12 +321,12 @@ IcmpAliasIn2(struct ip *pip)
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link = FindUdpTcpIn(ip->ip_dst, ip->ip_src,
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tc->th_dport, tc->th_sport,
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IPPROTO_TCP);
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else if (ip->ip_p == IPPROTO_ICMP) {
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else if (ip->ip_p == IPPROTO_ICMP)
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if (ic2->icmp_type == ICMP_ECHO || ic2->icmp_type == ICMP_TSTAMP)
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link = FindIcmpIn(ip->ip_dst, ip->ip_src, ic2->icmp_id);
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else
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link = NULL;
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} else
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else
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link = NULL;
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if (link != NULL)
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@ -605,6 +608,21 @@ UdpAliasIn(struct ip *pip)
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alias_port = ud->uh_dport;
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ud->uh_dport = GetOriginalPort(link);
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/* If NETBIOS Datagram, It should be alias address in UDP Data, too */
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if (ntohs(ud->uh_dport) == NETBIOS_DGM_PORT_NUMBER
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|| ntohs(ud->uh_sport) == NETBIOS_DGM_PORT_NUMBER )
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{
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AliasHandleUdpNbt(pip, link, &original_address, ud->uh_dport);
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} else if (ntohs(ud->uh_dport) == NETBIOS_NS_PORT_NUMBER
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|| ntohs(ud->uh_sport) == NETBIOS_NS_PORT_NUMBER )
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{
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AliasHandleUdpNbtNS(pip, link,
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&alias_address,
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&alias_port,
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&original_address,
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&ud->uh_dport );
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}
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/* If UDP checksum is not zero, then adjust since destination port */
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/* is being unaliased and destination port is being altered. */
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if (ud->uh_sum != 0)
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@ -650,6 +668,21 @@ UdpAliasOut(struct ip *pip)
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alias_address = GetAliasAddress(link);
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alias_port = GetAliasPort(link);
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/* If NETBIOS Datagram, It should be alias address in UDP Data, too */
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if (ntohs(ud->uh_dport) == NETBIOS_DGM_PORT_NUMBER
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|| ntohs(ud->uh_sport) == NETBIOS_DGM_PORT_NUMBER )
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{
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AliasHandleUdpNbt(pip, link, &alias_address, alias_port);
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} else if (ntohs(ud->uh_dport) == NETBIOS_NS_PORT_NUMBER
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|| ntohs(ud->uh_sport) == NETBIOS_NS_PORT_NUMBER )
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{
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AliasHandleUdpNbtNS(pip, link,
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&pip->ip_src,
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&ud->uh_sport,
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&alias_address,
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&alias_port);
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}
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/* If UDP checksum is not zero, adjust since source port is */
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/* being aliased and source address is being altered */
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if (ud->uh_sum != 0)
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@ -668,7 +701,7 @@ UdpAliasOut(struct ip *pip)
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ADJUST_CHECKSUM(accumulate, ud->uh_sum)
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}
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/* Put alias port in TCP header */
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/* Put alias port in UDP header */
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ud->uh_sport = alias_port;
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/* Change source address */
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@ -88,6 +88,10 @@ void HouseKeeping(void);
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/*lint -save -library Suppress flexelint warnings */
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void AliasHandleFtpOut(struct ip *, struct alias_link *, int);
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void AliasHandleIrcOut(struct ip *pip, struct alias_link *link, int maxsize );
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void AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short);
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void AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *);
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enum alias_tcp_state {
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ALIAS_TCP_STATE_NOT_CONNECTED,
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576
lib/libalias/alias_nbt.c
Normal file
576
lib/libalias/alias_nbt.c
Normal file
@ -0,0 +1,576 @@
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/*
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* Written by Atsushi Murai <amurai@spec.co.jp>
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*
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* Copyright (C) 1998, System Planning and Engineering Co. All rights reserverd.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the System Planning and Engineering Co. The name of the
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* SPEC may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id:$
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*
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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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/*
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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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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netinet/ip.h>
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#include <netinet/udp.h>
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#include <netinet/tcp.h>
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#include "alias_local.h"
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#define ADJUST_CHECKSUM(acc, cksum) { \
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acc += cksum; \
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if (acc < 0) \
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{ \
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acc = -acc; \
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acc = (acc >> 16) + (acc & 0xffff); \
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acc += acc >> 16; \
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cksum = (u_short) ~acc; \
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} \
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else \
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{ \
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acc = (acc >> 16) + (acc & 0xffff); \
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acc += acc >> 16; \
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cksum = (u_short) acc; \
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} \
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}
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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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/*******************************************************************
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* copy an IP address from one buffer to another *
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*******************************************************************/
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void putip(void *dest,void *src)
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{
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memcpy(dest,src,4);
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}
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void PrintRcode( u_char rcode ) {
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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???=%0x\n", rcode );
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}
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}
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/* Handling Name field */
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u_char *AliasHandleName ( u_char *p ) {
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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 & 0xc0 ) {
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p = p + 2;
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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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#ifdef 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 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 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 DEBUG
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printf(":");
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#endif
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fflush(stdout);
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}
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/* Set up to out of Name field */
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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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void AliasHandleUdpNbt(
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struct ip *pip, /* IP packet to examine/patch */
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struct alias_link *link,
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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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struct udphdr * uh;
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NbtDataHeader *ndh;
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u_char *p;
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/* Calculate data length of UDP packet */
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uh = (struct udphdr *) ((char *) pip + (pip->ip_hl << 2));
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ndh = (NbtDataHeader *)((char *)uh + (sizeof (struct udphdr)));
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#ifdef 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 ); /* Source Name */
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p = AliasHandleName ( p ); /* 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 ); /* Destination Name */
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break;
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}
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#ifdef DEBUG
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printf("%s:%d-->", inet_ntoa(ndh->source_ip), ntohs(ndh->source_port) );
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#endif
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/* Doing a 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 DEBUG
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printf("%s:%d\n", inet_ntoa(ndh->source_ip), ntohs(ndh->source_port) );
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fflush(stdout);
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#endif
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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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u_char *AliasHandleQuestion(u_short count,
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NBTNsQuestion *q,
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NBTArguments *nbtarg)
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{
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||||
|
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while ( count != 0 ) {
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||||
/* Name Filed */
|
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q = (NBTNsQuestion *)AliasHandleName((u_char *)q );
|
||||
|
||||
/* Type and Class filed */
|
||||
switch ( ntohs(q->type) ) {
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||||
case QS_TYPE_NB:
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||||
case QS_TYPE_NBSTAT:
|
||||
q= q+1;
|
||||
break;
|
||||
default:
|
||||
printf("\nUnknown Type on Question %0x\n", ntohs(q->type) );
|
||||
break;
|
||||
}
|
||||
count--;
|
||||
}
|
||||
|
||||
/* Set up to out of Question Section */
|
||||
return ((u_char *)q);
|
||||
}
|
||||
|
||||
/* Resource Record */
|
||||
#define RR_TYPE_A 0x0001
|
||||
#define RR_TYPE_NS 0x0002
|
||||
#define RR_TYPE_NULL 0x000a
|
||||
#define RR_TYPE_NB 0x0020
|
||||
#define RR_TYPE_NBSTAT 0x0021
|
||||
#define RR_CLAS_IN 0x0001
|
||||
#define SizeOfNsResource 8
|
||||
typedef struct {
|
||||
u_short type;
|
||||
u_short class;
|
||||
unsigned int ttl;
|
||||
u_short rdlen;
|
||||
} NBTNsResource;
|
||||
|
||||
#define SizeOfNsRNB 6
|
||||
typedef struct {
|
||||
u_short g:1, ont:2, resv:13;
|
||||
struct in_addr addr;
|
||||
} NBTNsRNB;
|
||||
|
||||
u_char *AliasHandleResourceNB( NBTNsResource *q,
|
||||
NBTArguments *nbtarg)
|
||||
{
|
||||
NBTNsRNB *nb;
|
||||
u_short bcount;
|
||||
|
||||
/* Check out a length */
|
||||
bcount = ntohs(q->rdlen);
|
||||
|
||||
/* Forward to Resource NB position */
|
||||
nb = (NBTNsRNB *)((u_char *)q + SizeOfNsResource);
|
||||
|
||||
/* Processing all in_addr array */
|
||||
#ifdef DEBUG
|
||||
printf("NB rec[%s", inet_ntoa(nbtarg->oldaddr));
|
||||
printf("->%s, %dbytes] ",inet_ntoa(nbtarg->newaddr ), bcount);
|
||||
#endif
|
||||
while ( bcount != 0 ) {
|
||||
#ifdef DEBUG
|
||||
printf("<%s>", inet_ntoa(nb->addr) );
|
||||
#endif
|
||||
if (!bcmp(&nbtarg->oldaddr,&nb->addr, sizeof(struct in_addr) ) ) {
|
||||
if ( *nbtarg->uh_sum != 0 ) {
|
||||
int acc;
|
||||
u_short *sptr;
|
||||
|
||||
sptr = (u_short *) &(nb->addr);
|
||||
acc = *sptr++;
|
||||
acc += *sptr;
|
||||
sptr = (u_short *) &(nbtarg->newaddr);
|
||||
acc -= *sptr++;
|
||||
acc -= *sptr;
|
||||
ADJUST_CHECKSUM(acc, *nbtarg->uh_sum)
|
||||
}
|
||||
|
||||
nb->addr = nbtarg->newaddr;
|
||||
#ifdef DEBUG
|
||||
printf("O");
|
||||
#endif
|
||||
}
|
||||
#ifdef DEBUG
|
||||
else {
|
||||
printf(".");
|
||||
}
|
||||
#endif
|
||||
nb=(NBTNsRNB *)((u_char *)nb + SizeOfNsRNB);
|
||||
bcount -= SizeOfNsRNB;
|
||||
}
|
||||
|
||||
return ((u_char *)nb);
|
||||
}
|
||||
|
||||
#define SizeOfResourceA 6
|
||||
typedef struct {
|
||||
struct in_addr addr;
|
||||
} NBTNsResourceA;
|
||||
|
||||
u_char *AliasHandleResourceA( NBTNsResource *q,
|
||||
NBTArguments *nbtarg)
|
||||
{
|
||||
NBTNsResourceA *a;
|
||||
u_short bcount;
|
||||
|
||||
/* 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 DEBUG
|
||||
printf("Arec [%s", inet_ntoa(nbtarg->oldaddr));
|
||||
printf("->%s]",inet_ntoa(nbtarg->newaddr ));
|
||||
#endif
|
||||
while ( bcount != 0 ) {
|
||||
#ifdef DEBUG
|
||||
printf("..%s", inet_ntoa(a->addr) );
|
||||
#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;
|
||||
}
|
||||
return ((u_char *)a);
|
||||
}
|
||||
|
||||
typedef struct {
|
||||
u_short opcode:4, flags:8, resv:4;
|
||||
} NBTNsResourceNULL;
|
||||
|
||||
u_char *AliasHandleResourceNULL( NBTNsResource *q,
|
||||
NBTArguments *nbtarg)
|
||||
{
|
||||
NBTNsResourceNULL *n;
|
||||
u_short bcount;
|
||||
|
||||
/* 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 ) {
|
||||
n++;
|
||||
bcount -= sizeof(NBTNsResourceNULL);
|
||||
}
|
||||
|
||||
return ((u_char *)n);
|
||||
}
|
||||
|
||||
u_char *AliasHandleResourceNS( NBTNsResource *q,
|
||||
NBTArguments *nbtarg)
|
||||
{
|
||||
NBTNsResourceNULL *n;
|
||||
u_short bcount;
|
||||
|
||||
/* 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 ); /* XXX */
|
||||
|
||||
return ((u_char *)n + bcount);
|
||||
}
|
||||
|
||||
typedef struct {
|
||||
u_short numnames;
|
||||
} NBTNsResourceNBSTAT;
|
||||
|
||||
u_char *AliasHandleResourceNBSTAT( NBTNsResource *q,
|
||||
NBTArguments *nbtarg)
|
||||
{
|
||||
NBTNsResourceNBSTAT *n;
|
||||
u_short bcount;
|
||||
|
||||
/* Forward to Resource NBSTAT position */
|
||||
n = (NBTNsResourceNBSTAT *)( (u_char *)q + sizeof(NBTNsResource) );
|
||||
|
||||
/* Check out of length */
|
||||
bcount = ntohs(q->rdlen);
|
||||
|
||||
return ((u_char *)n + bcount);
|
||||
}
|
||||
|
||||
u_char *AliasHandleResource(u_short count,
|
||||
NBTNsResource *q,
|
||||
NBTArguments *nbtarg)
|
||||
{
|
||||
while ( count != 0 ) {
|
||||
/* Resource Record Name Filed */
|
||||
q = (NBTNsResource *)AliasHandleName( (u_char *)q );
|
||||
#ifdef 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, nbtarg );
|
||||
break;
|
||||
case RR_TYPE_A:
|
||||
q = (NBTNsResource *)AliasHandleResourceA( q, nbtarg );
|
||||
break;
|
||||
case RR_TYPE_NS:
|
||||
q = (NBTNsResource *)AliasHandleResourceNS( q, nbtarg );
|
||||
break;
|
||||
case RR_TYPE_NULL:
|
||||
q = (NBTNsResource *)AliasHandleResourceNULL( q, nbtarg );
|
||||
break;
|
||||
case RR_TYPE_NBSTAT:
|
||||
q = (NBTNsResource *)AliasHandleResourceNBSTAT( q, nbtarg );
|
||||
break;
|
||||
default: printf("\nUnknown Type of Resource %0x\n",
|
||||
ntohs(q->type) );
|
||||
break;
|
||||
}
|
||||
count--;
|
||||
}
|
||||
fflush(stdout);
|
||||
return ((u_char *)q);
|
||||
}
|
||||
|
||||
void AliasHandleUdpNbtNS(
|
||||
struct ip *pip, /* IP packet to examine/patch */
|
||||
struct alias_link *link,
|
||||
struct in_addr *alias_address,
|
||||
u_short *alias_port,
|
||||
struct in_addr *original_address,
|
||||
u_short *original_port )
|
||||
{
|
||||
struct udphdr * uh;
|
||||
NbtNSHeader * nsh;
|
||||
u_short dlen;
|
||||
u_char * p;
|
||||
NBTArguments nbtarg;
|
||||
|
||||
/* 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 *) ((char *) pip + (pip->ip_hl << 2));
|
||||
nbtarg.uh_sum = &(uh->uh_sum);
|
||||
dlen = ntohs( uh->uh_ulen );
|
||||
nsh = (NbtNSHeader *)((char *)uh + (sizeof(struct udphdr)));
|
||||
p = (u_char *)(nsh + 1);
|
||||
|
||||
#ifdef 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, &nbtarg );
|
||||
}
|
||||
|
||||
/* Answer Resource Records */
|
||||
if (ntohs(nsh->ancount) !=0 ) {
|
||||
p = AliasHandleResource(ntohs(nsh->ancount), (NBTNsResource *)p, &nbtarg );
|
||||
}
|
||||
|
||||
/* Authority Resource Recodrs */
|
||||
if (ntohs(nsh->nscount) !=0 ) {
|
||||
p = AliasHandleResource(ntohs(nsh->nscount), (NBTNsResource *)p, &nbtarg );
|
||||
}
|
||||
|
||||
/* Additional Resource Recodrs */
|
||||
if (ntohs(nsh->arcount) !=0 ) {
|
||||
p = AliasHandleResource(ntohs(nsh->arcount), (NBTNsResource *)p, &nbtarg );
|
||||
}
|
||||
|
||||
#ifdef DEBUG
|
||||
PrintRcode(nsh->rcode);
|
||||
#endif
|
||||
return;
|
||||
}
|
||||
@ -124,3 +124,6 @@ Version 2.5: December, 1997 (ee)
|
||||
- Added PKT_ALIAS_PUNCH_FW mode for firewall
|
||||
bypass of FTP/IRC DCC data connections. Also added
|
||||
improved TCP connection monitoring.
|
||||
|
||||
Version 2.6: May, 1998 (amurai)
|
||||
- Added supporting routine for NetBios over TCP/IP.
|
||||
|
||||
@ -2,7 +2,9 @@ LIB= alias
|
||||
SHLIB_MAJOR= 2
|
||||
SHLIB_MINOR= 5
|
||||
CFLAGS+=-Wall -I${.CURDIR}
|
||||
SRCS= alias.c alias_db.c alias_ftp.c alias_irc.c alias_util.c alias_old.c
|
||||
SRCS= alias.c alias_db.c alias_ftp.c alias_irc.c alias_util.c alias_old.c \
|
||||
alias_nbt.c
|
||||
|
||||
MAN3=libalias.3
|
||||
|
||||
beforeinstall:
|
||||
|
||||
@ -93,6 +93,9 @@
|
||||
#include "alias_local.h"
|
||||
#include "alias.h"
|
||||
|
||||
#define NETBIOS_NS_PORT_NUMBER 137
|
||||
#define NETBIOS_DGM_PORT_NUMBER 138
|
||||
#define FTP_CONTROL_PORT_NUMBER 21
|
||||
#define FTP_CONTROL_PORT_NUMBER 21
|
||||
#define IRC_CONTROL_PORT_NUMBER_1 6667
|
||||
#define IRC_CONTROL_PORT_NUMBER_2 6668
|
||||
@ -318,12 +321,12 @@ IcmpAliasIn2(struct ip *pip)
|
||||
link = FindUdpTcpIn(ip->ip_dst, ip->ip_src,
|
||||
tc->th_dport, tc->th_sport,
|
||||
IPPROTO_TCP);
|
||||
else if (ip->ip_p == IPPROTO_ICMP) {
|
||||
else if (ip->ip_p == IPPROTO_ICMP)
|
||||
if (ic2->icmp_type == ICMP_ECHO || ic2->icmp_type == ICMP_TSTAMP)
|
||||
link = FindIcmpIn(ip->ip_dst, ip->ip_src, ic2->icmp_id);
|
||||
else
|
||||
link = NULL;
|
||||
} else
|
||||
else
|
||||
link = NULL;
|
||||
|
||||
if (link != NULL)
|
||||
@ -605,6 +608,21 @@ UdpAliasIn(struct ip *pip)
|
||||
alias_port = ud->uh_dport;
|
||||
ud->uh_dport = GetOriginalPort(link);
|
||||
|
||||
/* If NETBIOS Datagram, It should be alias address in UDP Data, too */
|
||||
if (ntohs(ud->uh_dport) == NETBIOS_DGM_PORT_NUMBER
|
||||
|| ntohs(ud->uh_sport) == NETBIOS_DGM_PORT_NUMBER )
|
||||
{
|
||||
AliasHandleUdpNbt(pip, link, &original_address, ud->uh_dport);
|
||||
} else if (ntohs(ud->uh_dport) == NETBIOS_NS_PORT_NUMBER
|
||||
|| ntohs(ud->uh_sport) == NETBIOS_NS_PORT_NUMBER )
|
||||
{
|
||||
AliasHandleUdpNbtNS(pip, link,
|
||||
&alias_address,
|
||||
&alias_port,
|
||||
&original_address,
|
||||
&ud->uh_dport );
|
||||
}
|
||||
|
||||
/* If UDP checksum is not zero, then adjust since destination port */
|
||||
/* is being unaliased and destination port is being altered. */
|
||||
if (ud->uh_sum != 0)
|
||||
@ -650,6 +668,21 @@ UdpAliasOut(struct ip *pip)
|
||||
alias_address = GetAliasAddress(link);
|
||||
alias_port = GetAliasPort(link);
|
||||
|
||||
/* If NETBIOS Datagram, It should be alias address in UDP Data, too */
|
||||
if (ntohs(ud->uh_dport) == NETBIOS_DGM_PORT_NUMBER
|
||||
|| ntohs(ud->uh_sport) == NETBIOS_DGM_PORT_NUMBER )
|
||||
{
|
||||
AliasHandleUdpNbt(pip, link, &alias_address, alias_port);
|
||||
} else if (ntohs(ud->uh_dport) == NETBIOS_NS_PORT_NUMBER
|
||||
|| ntohs(ud->uh_sport) == NETBIOS_NS_PORT_NUMBER )
|
||||
{
|
||||
AliasHandleUdpNbtNS(pip, link,
|
||||
&pip->ip_src,
|
||||
&ud->uh_sport,
|
||||
&alias_address,
|
||||
&alias_port);
|
||||
}
|
||||
|
||||
/* If UDP checksum is not zero, adjust since source port is */
|
||||
/* being aliased and source address is being altered */
|
||||
if (ud->uh_sum != 0)
|
||||
@ -668,7 +701,7 @@ UdpAliasOut(struct ip *pip)
|
||||
ADJUST_CHECKSUM(accumulate, ud->uh_sum)
|
||||
}
|
||||
|
||||
/* Put alias port in TCP header */
|
||||
/* Put alias port in UDP header */
|
||||
ud->uh_sport = alias_port;
|
||||
|
||||
/* Change source address */
|
||||
|
||||
@ -88,6 +88,10 @@ void HouseKeeping(void);
|
||||
/*lint -save -library Suppress flexelint warnings */
|
||||
void AliasHandleFtpOut(struct ip *, struct alias_link *, int);
|
||||
void AliasHandleIrcOut(struct ip *pip, struct alias_link *link, int maxsize );
|
||||
void AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short);
|
||||
void AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *);
|
||||
|
||||
|
||||
|
||||
enum alias_tcp_state {
|
||||
ALIAS_TCP_STATE_NOT_CONNECTED,
|
||||
|
||||
576
sys/netinet/libalias/alias_nbt.c
Normal file
576
sys/netinet/libalias/alias_nbt.c
Normal file
@ -0,0 +1,576 @@
|
||||
/*
|
||||
* Written by Atsushi Murai <amurai@spec.co.jp>
|
||||
*
|
||||
* Copyright (C) 1998, System Planning and Engineering Co. All rights reserverd.
|
||||
*
|
||||
* Redistribution and use in source and binary forms are permitted
|
||||
* provided that the above copyright notice and this paragraph are
|
||||
* duplicated in all such forms and that any documentation,
|
||||
* advertising materials, and other materials related to such
|
||||
* distribution and use acknowledge that the software was developed
|
||||
* by the System Planning and Engineering Co. The name of the
|
||||
* SPEC may not be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
||||
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
||||
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
||||
*
|
||||
* $Id:$
|
||||
*
|
||||
* TODO:
|
||||
* oClean up.
|
||||
* oConsidering for word alignment for other platform.
|
||||
*/
|
||||
/*
|
||||
alias_nbt.c performs special processing for NetBios over TCP/IP
|
||||
sessions by UDP.
|
||||
|
||||
Initial version: May, 1998 (Atsushi Murai <amurai@spec.co.jp>)
|
||||
|
||||
See HISTORY file for record of revisions.
|
||||
*/
|
||||
|
||||
/* Includes */
|
||||
#include <ctype.h>
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
#include <sys/types.h>
|
||||
#include <netinet/in_systm.h>
|
||||
#include <netinet/in.h>
|
||||
#include <arpa/inet.h>
|
||||
#include <netinet/ip.h>
|
||||
#include <netinet/udp.h>
|
||||
#include <netinet/tcp.h>
|
||||
|
||||
#include "alias_local.h"
|
||||
|
||||
#define ADJUST_CHECKSUM(acc, cksum) { \
|
||||
acc += cksum; \
|
||||
if (acc < 0) \
|
||||
{ \
|
||||
acc = -acc; \
|
||||
acc = (acc >> 16) + (acc & 0xffff); \
|
||||
acc += acc >> 16; \
|
||||
cksum = (u_short) ~acc; \
|
||||
} \
|
||||
else \
|
||||
{ \
|
||||
acc = (acc >> 16) + (acc & 0xffff); \
|
||||
acc += acc >> 16; \
|
||||
cksum = (u_short) acc; \
|
||||
} \
|
||||
}
|
||||
|
||||
typedef struct {
|
||||
struct in_addr oldaddr;
|
||||
u_short oldport;
|
||||
struct in_addr newaddr;
|
||||
u_short newport;
|
||||
u_short *uh_sum;
|
||||
} NBTArguments;
|
||||
|
||||
typedef struct {
|
||||
unsigned char type;
|
||||
unsigned char flags;
|
||||
u_short id;
|
||||
struct in_addr source_ip;
|
||||
u_short source_port;
|
||||
u_short len;
|
||||
u_short offset;
|
||||
} NbtDataHeader;
|
||||
|
||||
#define OpQuery 0
|
||||
#define OpUnknown 4
|
||||
#define OpRegist 5
|
||||
#define OpRelease 6
|
||||
#define OpWACK 7
|
||||
#define OpRefresh 8
|
||||
typedef struct {
|
||||
u_short nametrid;
|
||||
u_short dir:1, opcode:4, nmflags:7, rcode:4;
|
||||
u_short qdcount;
|
||||
u_short ancount;
|
||||
u_short nscount;
|
||||
u_short arcount;
|
||||
} NbtNSHeader;
|
||||
|
||||
#define FMT_ERR 0x1
|
||||
#define SRV_ERR 0x2
|
||||
#define IMP_ERR 0x4
|
||||
#define RFS_ERR 0x5
|
||||
#define ACT_ERR 0x6
|
||||
#define CFT_ERR 0x7
|
||||
|
||||
/*******************************************************************
|
||||
* copy an IP address from one buffer to another *
|
||||
*******************************************************************/
|
||||
void putip(void *dest,void *src)
|
||||
{
|
||||
memcpy(dest,src,4);
|
||||
}
|
||||
|
||||
void PrintRcode( u_char rcode ) {
|
||||
|
||||
switch (rcode) {
|
||||
case FMT_ERR:
|
||||
printf("\nFormat Error.");
|
||||
case SRV_ERR:
|
||||
printf("\nSever failure.");
|
||||
case IMP_ERR:
|
||||
printf("\nUnsupported request error.\n");
|
||||
case RFS_ERR:
|
||||
printf("\nRefused error.\n");
|
||||
case ACT_ERR:
|
||||
printf("\nActive error.\n");
|
||||
case CFT_ERR:
|
||||
printf("\nName in conflict error.\n");
|
||||
default:
|
||||
printf("\n???=%0x\n", rcode );
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/* Handling Name field */
|
||||
u_char *AliasHandleName ( u_char *p ) {
|
||||
|
||||
u_char *s;
|
||||
u_char c;
|
||||
int compress;
|
||||
|
||||
/* Following length field */
|
||||
if (*p & 0xc0 ) {
|
||||
p = p + 2;
|
||||
return ((u_char *)p);
|
||||
}
|
||||
while ( ( *p & 0x3f) != 0x00 ) {
|
||||
s = p + 1;
|
||||
if ( *p == 0x20 )
|
||||
compress = 1;
|
||||
else
|
||||
compress = 0;
|
||||
|
||||
/* Get next length field */
|
||||
p = (u_char *)(p + (*p & 0x3f) + 1);
|
||||
#ifdef DEBUG
|
||||
printf(":");
|
||||
#endif
|
||||
while (s < p) {
|
||||
if ( compress == 1 ) {
|
||||
c = (u_char )(((((*s & 0x0f) << 4) | (*(s+1) & 0x0f)) - 0x11));
|
||||
#ifdef DEBUG
|
||||
if (isprint( c ) )
|
||||
printf("%c", c );
|
||||
else
|
||||
printf("<0x%02x>", c );
|
||||
#endif
|
||||
s +=2;
|
||||
} else {
|
||||
#ifdef DEBUG
|
||||
printf("%c", *s);
|
||||
#endif
|
||||
s++;
|
||||
}
|
||||
}
|
||||
#ifdef DEBUG
|
||||
printf(":");
|
||||
#endif
|
||||
fflush(stdout);
|
||||
}
|
||||
|
||||
/* Set up to out of Name field */
|
||||
p++;
|
||||
return ((u_char *)p);
|
||||
}
|
||||
|
||||
/*
|
||||
* NetBios Datagram Handler (IP/UDP)
|
||||
*/
|
||||
#define DGM_DIRECT_UNIQ 0x10
|
||||
#define DGM_DIRECT_GROUP 0x11
|
||||
#define DGM_BROADCAST 0x12
|
||||
#define DGM_ERROR 0x13
|
||||
#define DGM_QUERY 0x14
|
||||
#define DGM_POSITIVE_RES 0x15
|
||||
#define DGM_NEGATIVE_RES 0x16
|
||||
|
||||
void AliasHandleUdpNbt(
|
||||
struct ip *pip, /* IP packet to examine/patch */
|
||||
struct alias_link *link,
|
||||
struct in_addr *alias_address,
|
||||
u_short alias_port )
|
||||
{
|
||||
struct udphdr * uh;
|
||||
NbtDataHeader *ndh;
|
||||
u_char *p;
|
||||
|
||||
/* Calculate data length of UDP packet */
|
||||
uh = (struct udphdr *) ((char *) pip + (pip->ip_hl << 2));
|
||||
ndh = (NbtDataHeader *)((char *)uh + (sizeof (struct udphdr)));
|
||||
#ifdef DEBUG
|
||||
printf("\nType=%02x,", ndh->type );
|
||||
#endif
|
||||
switch ( ndh->type ) {
|
||||
case DGM_DIRECT_UNIQ:
|
||||
case DGM_DIRECT_GROUP:
|
||||
case DGM_BROADCAST:
|
||||
p = (u_char *)ndh + 14;
|
||||
p = AliasHandleName ( p ); /* Source Name */
|
||||
p = AliasHandleName ( p ); /* Destination Name */
|
||||
break;
|
||||
case DGM_ERROR:
|
||||
p = (u_char *)ndh + 11;
|
||||
break;
|
||||
case DGM_QUERY:
|
||||
case DGM_POSITIVE_RES:
|
||||
case DGM_NEGATIVE_RES:
|
||||
p = (u_char *)ndh + 10;
|
||||
p = AliasHandleName ( p ); /* Destination Name */
|
||||
break;
|
||||
}
|
||||
#ifdef DEBUG
|
||||
printf("%s:%d-->", inet_ntoa(ndh->source_ip), ntohs(ndh->source_port) );
|
||||
#endif
|
||||
/* Doing a IP address and Port number Translation */
|
||||
if ( uh->uh_sum != 0 ) {
|
||||
int acc;
|
||||
u_short *sptr;
|
||||
acc = ndh->source_port;
|
||||
acc -= alias_port;
|
||||
sptr = (u_short *) &(ndh->source_ip);
|
||||
acc += *sptr++;
|
||||
acc += *sptr;
|
||||
sptr = (u_short *) alias_address;
|
||||
acc -= *sptr++;
|
||||
acc -= *sptr;
|
||||
ADJUST_CHECKSUM(acc, uh->uh_sum)
|
||||
}
|
||||
ndh->source_ip = *alias_address;
|
||||
ndh->source_port = alias_port;
|
||||
#ifdef DEBUG
|
||||
printf("%s:%d\n", inet_ntoa(ndh->source_ip), ntohs(ndh->source_port) );
|
||||
fflush(stdout);
|
||||
#endif
|
||||
}
|
||||
/* Question Section */
|
||||
#define QS_TYPE_NB 0x0020
|
||||
#define QS_TYPE_NBSTAT 0x0021
|
||||
#define QS_CLAS_IN 0x0001
|
||||
typedef struct {
|
||||
u_short type; /* The type of Request */
|
||||
u_short class; /* The class of Request */
|
||||
} NBTNsQuestion;
|
||||
|
||||
u_char *AliasHandleQuestion(u_short count,
|
||||
NBTNsQuestion *q,
|
||||
NBTArguments *nbtarg)
|
||||
{
|
||||
|
||||
while ( count != 0 ) {
|
||||
/* Name Filed */
|
||||
q = (NBTNsQuestion *)AliasHandleName((u_char *)q );
|
||||
|
||||
/* Type and Class filed */
|
||||
switch ( ntohs(q->type) ) {
|
||||
case QS_TYPE_NB:
|
||||
case QS_TYPE_NBSTAT:
|
||||
q= q+1;
|
||||
break;
|
||||
default:
|
||||
printf("\nUnknown Type on Question %0x\n", ntohs(q->type) );
|
||||
break;
|
||||
}
|
||||
count--;
|
||||
}
|
||||
|
||||
/* Set up to out of Question Section */
|
||||
return ((u_char *)q);
|
||||
}
|
||||
|
||||
/* Resource Record */
|
||||
#define RR_TYPE_A 0x0001
|
||||
#define RR_TYPE_NS 0x0002
|
||||
#define RR_TYPE_NULL 0x000a
|
||||
#define RR_TYPE_NB 0x0020
|
||||
#define RR_TYPE_NBSTAT 0x0021
|
||||
#define RR_CLAS_IN 0x0001
|
||||
#define SizeOfNsResource 8
|
||||
typedef struct {
|
||||
u_short type;
|
||||
u_short class;
|
||||
unsigned int ttl;
|
||||
u_short rdlen;
|
||||
} NBTNsResource;
|
||||
|
||||
#define SizeOfNsRNB 6
|
||||
typedef struct {
|
||||
u_short g:1, ont:2, resv:13;
|
||||
struct in_addr addr;
|
||||
} NBTNsRNB;
|
||||
|
||||
u_char *AliasHandleResourceNB( NBTNsResource *q,
|
||||
NBTArguments *nbtarg)
|
||||
{
|
||||
NBTNsRNB *nb;
|
||||
u_short bcount;
|
||||
|
||||
/* Check out a length */
|
||||
bcount = ntohs(q->rdlen);
|
||||
|
||||
/* Forward to Resource NB position */
|
||||
nb = (NBTNsRNB *)((u_char *)q + SizeOfNsResource);
|
||||
|
||||
/* Processing all in_addr array */
|
||||
#ifdef DEBUG
|
||||
printf("NB rec[%s", inet_ntoa(nbtarg->oldaddr));
|
||||
printf("->%s, %dbytes] ",inet_ntoa(nbtarg->newaddr ), bcount);
|
||||
#endif
|
||||
while ( bcount != 0 ) {
|
||||
#ifdef DEBUG
|
||||
printf("<%s>", inet_ntoa(nb->addr) );
|
||||
#endif
|
||||
if (!bcmp(&nbtarg->oldaddr,&nb->addr, sizeof(struct in_addr) ) ) {
|
||||
if ( *nbtarg->uh_sum != 0 ) {
|
||||
int acc;
|
||||
u_short *sptr;
|
||||
|
||||
sptr = (u_short *) &(nb->addr);
|
||||
acc = *sptr++;
|
||||
acc += *sptr;
|
||||
sptr = (u_short *) &(nbtarg->newaddr);
|
||||
acc -= *sptr++;
|
||||
acc -= *sptr;
|
||||
ADJUST_CHECKSUM(acc, *nbtarg->uh_sum)
|
||||
}
|
||||
|
||||
nb->addr = nbtarg->newaddr;
|
||||
#ifdef DEBUG
|
||||
printf("O");
|
||||
#endif
|
||||
}
|
||||
#ifdef DEBUG
|
||||
else {
|
||||
printf(".");
|
||||
}
|
||||
#endif
|
||||
nb=(NBTNsRNB *)((u_char *)nb + SizeOfNsRNB);
|
||||
bcount -= SizeOfNsRNB;
|
||||
}
|
||||
|
||||
return ((u_char *)nb);
|
||||
}
|
||||
|
||||
#define SizeOfResourceA 6
|
||||
typedef struct {
|
||||
struct in_addr addr;
|
||||
} NBTNsResourceA;
|
||||
|
||||
u_char *AliasHandleResourceA( NBTNsResource *q,
|
||||
NBTArguments *nbtarg)
|
||||
{
|
||||
NBTNsResourceA *a;
|
||||
u_short bcount;
|
||||
|
||||
/* 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 DEBUG
|
||||
printf("Arec [%s", inet_ntoa(nbtarg->oldaddr));
|
||||
printf("->%s]",inet_ntoa(nbtarg->newaddr ));
|
||||
#endif
|
||||
while ( bcount != 0 ) {
|
||||
#ifdef DEBUG
|
||||
printf("..%s", inet_ntoa(a->addr) );
|
||||
#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;
|
||||
}
|
||||
return ((u_char *)a);
|
||||
}
|
||||
|
||||
typedef struct {
|
||||
u_short opcode:4, flags:8, resv:4;
|
||||
} NBTNsResourceNULL;
|
||||
|
||||
u_char *AliasHandleResourceNULL( NBTNsResource *q,
|
||||
NBTArguments *nbtarg)
|
||||
{
|
||||
NBTNsResourceNULL *n;
|
||||
u_short bcount;
|
||||
|
||||
/* 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 ) {
|
||||
n++;
|
||||
bcount -= sizeof(NBTNsResourceNULL);
|
||||
}
|
||||
|
||||
return ((u_char *)n);
|
||||
}
|
||||
|
||||
u_char *AliasHandleResourceNS( NBTNsResource *q,
|
||||
NBTArguments *nbtarg)
|
||||
{
|
||||
NBTNsResourceNULL *n;
|
||||
u_short bcount;
|
||||
|
||||
/* 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 ); /* XXX */
|
||||
|
||||
return ((u_char *)n + bcount);
|
||||
}
|
||||
|
||||
typedef struct {
|
||||
u_short numnames;
|
||||
} NBTNsResourceNBSTAT;
|
||||
|
||||
u_char *AliasHandleResourceNBSTAT( NBTNsResource *q,
|
||||
NBTArguments *nbtarg)
|
||||
{
|
||||
NBTNsResourceNBSTAT *n;
|
||||
u_short bcount;
|
||||
|
||||
/* Forward to Resource NBSTAT position */
|
||||
n = (NBTNsResourceNBSTAT *)( (u_char *)q + sizeof(NBTNsResource) );
|
||||
|
||||
/* Check out of length */
|
||||
bcount = ntohs(q->rdlen);
|
||||
|
||||
return ((u_char *)n + bcount);
|
||||
}
|
||||
|
||||
u_char *AliasHandleResource(u_short count,
|
||||
NBTNsResource *q,
|
||||
NBTArguments *nbtarg)
|
||||
{
|
||||
while ( count != 0 ) {
|
||||
/* Resource Record Name Filed */
|
||||
q = (NBTNsResource *)AliasHandleName( (u_char *)q );
|
||||
#ifdef 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, nbtarg );
|
||||
break;
|
||||
case RR_TYPE_A:
|
||||
q = (NBTNsResource *)AliasHandleResourceA( q, nbtarg );
|
||||
break;
|
||||
case RR_TYPE_NS:
|
||||
q = (NBTNsResource *)AliasHandleResourceNS( q, nbtarg );
|
||||
break;
|
||||
case RR_TYPE_NULL:
|
||||
q = (NBTNsResource *)AliasHandleResourceNULL( q, nbtarg );
|
||||
break;
|
||||
case RR_TYPE_NBSTAT:
|
||||
q = (NBTNsResource *)AliasHandleResourceNBSTAT( q, nbtarg );
|
||||
break;
|
||||
default: printf("\nUnknown Type of Resource %0x\n",
|
||||
ntohs(q->type) );
|
||||
break;
|
||||
}
|
||||
count--;
|
||||
}
|
||||
fflush(stdout);
|
||||
return ((u_char *)q);
|
||||
}
|
||||
|
||||
void AliasHandleUdpNbtNS(
|
||||
struct ip *pip, /* IP packet to examine/patch */
|
||||
struct alias_link *link,
|
||||
struct in_addr *alias_address,
|
||||
u_short *alias_port,
|
||||
struct in_addr *original_address,
|
||||
u_short *original_port )
|
||||
{
|
||||
struct udphdr * uh;
|
||||
NbtNSHeader * nsh;
|
||||
u_short dlen;
|
||||
u_char * p;
|
||||
NBTArguments nbtarg;
|
||||
|
||||
/* 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 *) ((char *) pip + (pip->ip_hl << 2));
|
||||
nbtarg.uh_sum = &(uh->uh_sum);
|
||||
dlen = ntohs( uh->uh_ulen );
|
||||
nsh = (NbtNSHeader *)((char *)uh + (sizeof(struct udphdr)));
|
||||
p = (u_char *)(nsh + 1);
|
||||
|
||||
#ifdef 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, &nbtarg );
|
||||
}
|
||||
|
||||
/* Answer Resource Records */
|
||||
if (ntohs(nsh->ancount) !=0 ) {
|
||||
p = AliasHandleResource(ntohs(nsh->ancount), (NBTNsResource *)p, &nbtarg );
|
||||
}
|
||||
|
||||
/* Authority Resource Recodrs */
|
||||
if (ntohs(nsh->nscount) !=0 ) {
|
||||
p = AliasHandleResource(ntohs(nsh->nscount), (NBTNsResource *)p, &nbtarg );
|
||||
}
|
||||
|
||||
/* Additional Resource Recodrs */
|
||||
if (ntohs(nsh->arcount) !=0 ) {
|
||||
p = AliasHandleResource(ntohs(nsh->arcount), (NBTNsResource *)p, &nbtarg );
|
||||
}
|
||||
|
||||
#ifdef DEBUG
|
||||
PrintRcode(nsh->rcode);
|
||||
#endif
|
||||
return;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user