712 lines
15 KiB
C
712 lines
15 KiB
C
/*
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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: alias_nbt.c,v 1.2 1998/12/14 02:25:32 dillon Exp $
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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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#ifdef DEBUG
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static 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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#endif
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/* Handling Name field */
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static u_char *AliasHandleName ( u_char *p, char *pmax ) {
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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 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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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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int 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 = NULL;
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char *pmax;
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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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pmax = (char *)uh + ntohs( uh->uh_ulen );
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ndh = (NbtDataHeader *)((char *)uh + (sizeof (struct udphdr)));
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if ((char *)(ndh + 1) > pmax)
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return(-1);
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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, 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 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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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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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 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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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 DEBUG
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printf("NB rec[%s", inet_ntoa(nbtarg->oldaddr));
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printf("->%s, %dbytes] ",inet_ntoa(nbtarg->newaddr ), 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 DEBUG
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printf("<%s>", inet_ntoa(nb->addr) );
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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 DEBUG
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printf("O");
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#endif
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}
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#ifdef 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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}
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if (nb == NULL || (char *)(nb + 1) > pmax) {
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nb = NULL;
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}
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return ((u_char *)nb);
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}
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#define SizeOfResourceA 6
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typedef struct {
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struct in_addr addr;
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} NBTNsResourceA;
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static u_char *
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AliasHandleResourceA(
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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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NBTNsResourceA *a;
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u_short bcount;
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if (q == NULL || (char *)(q + 1) > pmax)
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return(NULL);
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/* Forward to Resource A position */
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a = (NBTNsResourceA *)( (u_char *)q + sizeof(NBTNsResource) );
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/* Check out of length */
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bcount = ntohs(q->rdlen);
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/* Processing all in_addr array */
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#ifdef DEBUG
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printf("Arec [%s", inet_ntoa(nbtarg->oldaddr));
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printf("->%s]",inet_ntoa(nbtarg->newaddr ));
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#endif
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while ( bcount != 0 ) {
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if (a == NULL || (char *)(a + 1) > pmax)
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return(NULL);
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#ifdef DEBUG
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printf("..%s", inet_ntoa(a->addr) );
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#endif
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if ( !bcmp(&nbtarg->oldaddr, &a->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 *) &(a->addr); /* Old */
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acc = *sptr++;
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acc += *sptr;
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sptr = (u_short *) &nbtarg->newaddr; /* New */
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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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a->addr = nbtarg->newaddr;
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}
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a++; /*XXXX*/
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bcount -= SizeOfResourceA;
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}
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if (a == NULL || (char *)(a + 1) > pmax)
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a = NULL;
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return ((u_char *)a);
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}
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typedef struct {
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u_short opcode:4, flags:8, resv:4;
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} NBTNsResourceNULL;
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static u_char *
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AliasHandleResourceNULL(
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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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NBTNsResourceNULL *n;
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u_short bcount;
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if (q == NULL || (char *)(q + 1) > pmax)
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return(NULL);
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/* Forward to Resource NULL position */
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n = (NBTNsResourceNULL *)( (u_char *)q + sizeof(NBTNsResource) );
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/* Check out of length */
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bcount = ntohs(q->rdlen);
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/* Processing all in_addr array */
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while ( bcount != 0 ) {
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if ((char *)(n + 1) > pmax) {
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n = NULL;
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break;
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}
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n++;
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bcount -= sizeof(NBTNsResourceNULL);
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}
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if ((char *)(n + 1) > pmax)
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n = NULL;
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return ((u_char *)n);
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}
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static u_char *
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AliasHandleResourceNS(
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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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NBTNsResourceNULL *n;
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u_short bcount;
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if (q == NULL || (char *)(q + 1) > pmax)
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return(NULL);
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/* Forward to Resource NULL position */
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n = (NBTNsResourceNULL *)( (u_char *)q + sizeof(NBTNsResource) );
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/* Check out of length */
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bcount = ntohs(q->rdlen);
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/* Resource Record Name Filed */
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q = (NBTNsResource *)AliasHandleName( (u_char *)n, pmax ); /* XXX */
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if (q == NULL || (char *)((u_char *)n + bcount) > pmax)
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return(NULL);
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else
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return ((u_char *)n + bcount);
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}
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typedef struct {
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u_short numnames;
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} NBTNsResourceNBSTAT;
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static u_char *
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AliasHandleResourceNBSTAT(
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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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NBTNsResourceNBSTAT *n;
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u_short bcount;
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if (q == NULL || (char *)(q + 1) > pmax)
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return(NULL);
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/* Forward to Resource NBSTAT position */
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n = (NBTNsResourceNBSTAT *)( (u_char *)q + sizeof(NBTNsResource) );
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/* Check out of length */
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bcount = ntohs(q->rdlen);
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if (q == NULL || (char *)((u_char *)n + bcount) > pmax)
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return(NULL);
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else
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return ((u_char *)n + bcount);
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}
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static u_char *
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AliasHandleResource(
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u_short count,
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NBTNsResource *q,
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char *pmax,
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NBTArguments
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*nbtarg)
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{
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while ( count != 0 ) {
|
|
/* Resource Record Name Filed */
|
|
q = (NBTNsResource *)AliasHandleName( (u_char *)q, pmax );
|
|
|
|
if (q == NULL || (char *)(q + 1) > pmax)
|
|
break;
|
|
#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,
|
|
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 DEBUG
|
|
printf(
|
|
"\nUnknown Type of Resource %0x\n",
|
|
ntohs(q->type)
|
|
);
|
|
#endif
|
|
break;
|
|
}
|
|
count--;
|
|
}
|
|
fflush(stdout);
|
|
return ((u_char *)q);
|
|
}
|
|
|
|
int 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_char * p;
|
|
char *pmax;
|
|
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);
|
|
nsh = (NbtNSHeader *)((char *)uh + (sizeof(struct udphdr)));
|
|
p = (u_char *)(nsh + 1);
|
|
pmax = (char *)uh + ntohs( uh->uh_ulen );
|
|
|
|
if ((char *)(nsh + 1) > pmax)
|
|
return(-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,
|
|
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 DEBUG
|
|
PrintRcode(nsh->rcode);
|
|
#endif
|
|
return ((p == NULL) ? -1 : 0);
|
|
}
|