735 lines
15 KiB
C
735 lines
15 KiB
C
/*-
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* Written by Atsushi Murai <amurai@spec.co.jp>
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* Copyright (c) 1998, System Planning and Engineering Co.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* TODO:
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* oClean up.
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* oConsidering for word alignment for other platform.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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alias_nbt.c performs special processing for NetBios over TCP/IP
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sessions by UDP.
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Initial version: May, 1998 (Atsushi Murai <amurai@spec.co.jp>)
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See HISTORY file for record of revisions.
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*/
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/* Includes */
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#ifdef _KERNEL
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#include <sys/param.h>
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#include <sys/ctype.h>
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#include <sys/libkern.h>
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#else
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#include <sys/types.h>
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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 <arpa/inet.h>
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#endif
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/udp.h>
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#include <netinet/tcp.h>
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#ifdef _KERNEL
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#include <netinet/libalias/alias.h>
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#include <netinet/libalias/alias_local.h>
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#else
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#include "alias_local.h"
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#endif
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typedef struct {
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struct in_addr oldaddr;
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u_short oldport;
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struct in_addr newaddr;
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u_short newport;
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u_short *uh_sum;
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} NBTArguments;
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typedef struct {
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unsigned char type;
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unsigned char flags;
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u_short id;
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struct in_addr source_ip;
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u_short source_port;
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u_short len;
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u_short offset;
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} NbtDataHeader;
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#define OpQuery 0
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#define OpUnknown 4
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#define OpRegist 5
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#define OpRelease 6
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#define OpWACK 7
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#define OpRefresh 8
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typedef struct {
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u_short nametrid;
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u_short dir: 1, opcode:4, nmflags:7, rcode:4;
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u_short qdcount;
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u_short ancount;
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u_short nscount;
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u_short arcount;
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} NbtNSHeader;
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#define FMT_ERR 0x1
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#define SRV_ERR 0x2
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#define IMP_ERR 0x4
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#define RFS_ERR 0x5
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#define ACT_ERR 0x6
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#define CFT_ERR 0x7
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#ifdef LIBALIAS_DEBUG
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static void
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PrintRcode(u_char rcode)
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{
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switch (rcode) {
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case FMT_ERR:
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printf("\nFormat Error.");
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case SRV_ERR:
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printf("\nSever failure.");
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case IMP_ERR:
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printf("\nUnsupported request error.\n");
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case RFS_ERR:
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printf("\nRefused error.\n");
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case ACT_ERR:
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printf("\nActive error.\n");
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case CFT_ERR:
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printf("\nName in conflict error.\n");
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default:
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printf("\n?%c?=%0x\n", '?', rcode);
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}
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}
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#endif
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/* Handling Name field */
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static u_char *
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AliasHandleName(u_char * p, char *pmax)
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{
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u_char *s;
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u_char c;
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int compress;
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/* Following length field */
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if (p == NULL || (char *)p >= pmax)
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return (NULL);
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if (*p & 0xc0) {
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p = p + 2;
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if ((char *)p > pmax)
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return (NULL);
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return ((u_char *) p);
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}
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while ((*p & 0x3f) != 0x00) {
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s = p + 1;
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if (*p == 0x20)
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compress = 1;
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else
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compress = 0;
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/* Get next length field */
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p = (u_char *) (p + (*p & 0x3f) + 1);
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if ((char *)p > pmax) {
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p = NULL;
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break;
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}
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#ifdef LIBALIAS_DEBUG
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printf(":");
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#endif
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while (s < p) {
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if (compress == 1) {
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c = (u_char) (((((*s & 0x0f) << 4) | (*(s + 1) & 0x0f)) - 0x11));
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#ifdef LIBALIAS_DEBUG
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if (isprint(c))
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printf("%c", c);
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else
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printf("<0x%02x>", c);
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#endif
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s += 2;
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} else {
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#ifdef LIBALIAS_DEBUG
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printf("%c", *s);
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#endif
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s++;
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}
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}
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#ifdef LIBALIAS_DEBUG
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printf(":");
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fflush(stdout);
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#endif
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}
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/* Set up to out of Name field */
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if (p == NULL || (char *)p >= pmax)
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p = NULL;
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else
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p++;
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return ((u_char *) p);
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}
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/*
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* NetBios Datagram Handler (IP/UDP)
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*/
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#define DGM_DIRECT_UNIQ 0x10
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#define DGM_DIRECT_GROUP 0x11
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#define DGM_BROADCAST 0x12
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#define DGM_ERROR 0x13
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#define DGM_QUERY 0x14
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#define DGM_POSITIVE_RES 0x15
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#define DGM_NEGATIVE_RES 0x16
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int
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AliasHandleUdpNbt(
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struct libalias *la,
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struct ip *pip, /* IP packet to examine/patch */
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struct alias_link *lnk,
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struct in_addr *alias_address,
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u_short alias_port
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)
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{
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struct udphdr *uh;
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NbtDataHeader *ndh;
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u_char *p = NULL;
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char *pmax;
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(void)la;
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(void)lnk;
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/* Calculate data length of UDP packet */
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uh = (struct udphdr *)ip_next(pip);
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pmax = (char *)uh + ntohs(uh->uh_ulen);
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ndh = (NbtDataHeader *)udp_next(uh);
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if ((char *)(ndh + 1) > pmax)
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return (-1);
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#ifdef LIBALIAS_DEBUG
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printf("\nType=%02x,", ndh->type);
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#endif
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switch (ndh->type) {
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case DGM_DIRECT_UNIQ:
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case DGM_DIRECT_GROUP:
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case DGM_BROADCAST:
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p = (u_char *) ndh + 14;
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p = AliasHandleName(p, pmax); /* Source Name */
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p = AliasHandleName(p, pmax); /* Destination Name */
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break;
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case DGM_ERROR:
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p = (u_char *) ndh + 11;
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break;
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case DGM_QUERY:
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case DGM_POSITIVE_RES:
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case DGM_NEGATIVE_RES:
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p = (u_char *) ndh + 10;
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p = AliasHandleName(p, pmax); /* Destination Name */
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break;
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}
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if (p == NULL || (char *)p > pmax)
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p = NULL;
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#ifdef LIBALIAS_DEBUG
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printf("%s:%d-->", inet_ntoa(ndh->source_ip), ntohs(ndh->source_port));
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#endif
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/* Doing an IP address and Port number Translation */
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if (uh->uh_sum != 0) {
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int acc;
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u_short *sptr;
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acc = ndh->source_port;
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acc -= alias_port;
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sptr = (u_short *) & (ndh->source_ip);
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acc += *sptr++;
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acc += *sptr;
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sptr = (u_short *) alias_address;
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acc -= *sptr++;
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acc -= *sptr;
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ADJUST_CHECKSUM(acc, uh->uh_sum);
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}
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ndh->source_ip = *alias_address;
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ndh->source_port = alias_port;
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#ifdef LIBALIAS_DEBUG
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printf("%s:%d\n", inet_ntoa(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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(void)nbtarg;
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while (count != 0) {
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/* Name Filed */
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q = (NBTNsQuestion *) AliasHandleName((u_char *) q, pmax);
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if (q == NULL || (char *)(q + 1) > pmax) {
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q = NULL;
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break;
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}
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/* Type and Class filed */
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switch (ntohs(q->type)) {
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case QS_TYPE_NB:
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case QS_TYPE_NBSTAT:
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q = q + 1;
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break;
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default:
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#ifdef LIBALIAS_DEBUG
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printf("\nUnknown Type on Question %0x\n", ntohs(q->type));
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#endif
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break;
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}
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count--;
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}
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/* Set up to out of Question Section */
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return ((u_char *) q);
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}
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/* Resource Record */
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#define RR_TYPE_A 0x0001
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#define RR_TYPE_NS 0x0002
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#define RR_TYPE_NULL 0x000a
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#define RR_TYPE_NB 0x0020
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#define RR_TYPE_NBSTAT 0x0021
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#define RR_CLAS_IN 0x0001
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#define SizeOfNsResource 8
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typedef struct {
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u_short type;
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u_short class;
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unsigned int ttl;
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u_short rdlen;
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} NBTNsResource;
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#define SizeOfNsRNB 6
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typedef struct {
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u_short g: 1 , ont:2, resv:13;
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struct in_addr addr;
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} NBTNsRNB;
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static u_char *
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AliasHandleResourceNB(
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NBTNsResource * q,
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char *pmax,
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NBTArguments * nbtarg)
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{
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NBTNsRNB *nb;
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u_short bcount;
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if (q == NULL || (char *)(q + 1) > pmax)
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return (NULL);
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/* Check out a length */
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bcount = ntohs(q->rdlen);
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/* Forward to Resource NB position */
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nb = (NBTNsRNB *) ((u_char *) q + SizeOfNsResource);
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/* Processing all in_addr array */
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#ifdef LIBALIAS_DEBUG
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printf("NB rec[%s", 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 LIBALIAS_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 LIBALIAS_DEBUG
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printf("O");
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#endif
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}
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#ifdef LIBALIAS_DEBUG
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else {
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printf(".");
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}
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#endif
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nb = (NBTNsRNB *) ((u_char *) nb + SizeOfNsRNB);
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bcount -= SizeOfNsRNB;
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}
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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 LIBALIAS_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 LIBALIAS_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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(void)nbtarg;
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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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(void)nbtarg;
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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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(void)nbtarg;
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|
|
if (q == NULL || (char *)(q + 1) > pmax)
|
|
return (NULL);
|
|
|
|
/* Forward to Resource NBSTAT position */
|
|
n = (NBTNsResourceNBSTAT *) ((u_char *) q + sizeof(NBTNsResource));
|
|
|
|
/* Check out of length */
|
|
bcount = ntohs(q->rdlen);
|
|
|
|
if (q == NULL || (char *)((u_char *) n + bcount) > pmax)
|
|
return (NULL);
|
|
else
|
|
return ((u_char *) n + bcount);
|
|
}
|
|
|
|
static u_char *
|
|
AliasHandleResource(
|
|
u_short count,
|
|
NBTNsResource * q,
|
|
char *pmax,
|
|
NBTArguments
|
|
* nbtarg)
|
|
{
|
|
while (count != 0) {
|
|
/* Resource Record Name Filed */
|
|
q = (NBTNsResource *) AliasHandleName((u_char *) q, pmax);
|
|
|
|
if (q == NULL || (char *)(q + 1) > pmax)
|
|
break;
|
|
#ifdef LIBALIAS_DEBUG
|
|
printf("type=%02x, count=%d\n", ntohs(q->type), count);
|
|
#endif
|
|
|
|
/* Type and Class filed */
|
|
switch (ntohs(q->type)) {
|
|
case RR_TYPE_NB:
|
|
q = (NBTNsResource *) AliasHandleResourceNB(
|
|
q,
|
|
pmax,
|
|
nbtarg
|
|
);
|
|
break;
|
|
case RR_TYPE_A:
|
|
q = (NBTNsResource *) AliasHandleResourceA(
|
|
q,
|
|
pmax,
|
|
nbtarg
|
|
);
|
|
break;
|
|
case RR_TYPE_NS:
|
|
q = (NBTNsResource *) AliasHandleResourceNS(
|
|
q,
|
|
pmax,
|
|
nbtarg
|
|
);
|
|
break;
|
|
case RR_TYPE_NULL:
|
|
q = (NBTNsResource *) AliasHandleResourceNULL(
|
|
q,
|
|
pmax,
|
|
nbtarg
|
|
);
|
|
break;
|
|
case RR_TYPE_NBSTAT:
|
|
q = (NBTNsResource *) AliasHandleResourceNBSTAT(
|
|
q,
|
|
pmax,
|
|
nbtarg
|
|
);
|
|
break;
|
|
default:
|
|
#ifdef LIBALIAS_DEBUG
|
|
printf(
|
|
"\nUnknown Type of Resource %0x\n",
|
|
ntohs(q->type)
|
|
);
|
|
fflush(stdout);
|
|
#endif
|
|
break;
|
|
}
|
|
count--;
|
|
}
|
|
return ((u_char *) q);
|
|
}
|
|
|
|
int
|
|
AliasHandleUdpNbtNS(
|
|
struct libalias *la,
|
|
struct ip *pip, /* IP packet to examine/patch */
|
|
struct alias_link *lnk,
|
|
struct in_addr *alias_address,
|
|
u_short * alias_port,
|
|
struct in_addr *original_address,
|
|
u_short * original_port)
|
|
{
|
|
struct udphdr *uh;
|
|
NbtNSHeader *nsh;
|
|
u_char *p;
|
|
char *pmax;
|
|
NBTArguments nbtarg;
|
|
|
|
(void)la;
|
|
(void)lnk;
|
|
|
|
/* Set up Common Parameter */
|
|
nbtarg.oldaddr = *alias_address;
|
|
nbtarg.oldport = *alias_port;
|
|
nbtarg.newaddr = *original_address;
|
|
nbtarg.newport = *original_port;
|
|
|
|
/* Calculate data length of UDP packet */
|
|
uh = (struct udphdr *)ip_next(pip);
|
|
nbtarg.uh_sum = &(uh->uh_sum);
|
|
nsh = (NbtNSHeader *)udp_next(uh);
|
|
p = (u_char *) (nsh + 1);
|
|
pmax = (char *)uh + ntohs(uh->uh_ulen);
|
|
|
|
if ((char *)(nsh + 1) > pmax)
|
|
return (-1);
|
|
|
|
#ifdef LIBALIAS_DEBUG
|
|
printf(" [%s] ID=%02x, op=%01x, flag=%02x, rcode=%01x, qd=%04x"
|
|
", an=%04x, ns=%04x, ar=%04x, [%d]-->",
|
|
nsh->dir ? "Response" : "Request",
|
|
nsh->nametrid,
|
|
nsh->opcode,
|
|
nsh->nmflags,
|
|
nsh->rcode,
|
|
ntohs(nsh->qdcount),
|
|
ntohs(nsh->ancount),
|
|
ntohs(nsh->nscount),
|
|
ntohs(nsh->arcount),
|
|
(u_char *) p - (u_char *) nsh
|
|
);
|
|
#endif
|
|
|
|
/* Question Entries */
|
|
if (ntohs(nsh->qdcount) != 0) {
|
|
p = AliasHandleQuestion(
|
|
ntohs(nsh->qdcount),
|
|
(NBTNsQuestion *) p,
|
|
pmax,
|
|
&nbtarg
|
|
);
|
|
}
|
|
/* Answer Resource Records */
|
|
if (ntohs(nsh->ancount) != 0) {
|
|
p = AliasHandleResource(
|
|
ntohs(nsh->ancount),
|
|
(NBTNsResource *) p,
|
|
pmax,
|
|
&nbtarg
|
|
);
|
|
}
|
|
/* Authority Resource Recodrs */
|
|
if (ntohs(nsh->nscount) != 0) {
|
|
p = AliasHandleResource(
|
|
ntohs(nsh->nscount),
|
|
(NBTNsResource *) p,
|
|
pmax,
|
|
&nbtarg
|
|
);
|
|
}
|
|
/* Additional Resource Recodrs */
|
|
if (ntohs(nsh->arcount) != 0) {
|
|
p = AliasHandleResource(
|
|
ntohs(nsh->arcount),
|
|
(NBTNsResource *) p,
|
|
pmax,
|
|
&nbtarg
|
|
);
|
|
}
|
|
#ifdef LIBALIAS_DEBUG
|
|
PrintRcode(nsh->rcode);
|
|
#endif
|
|
return ((p == NULL) ? -1 : 0);
|
|
}
|