dlls/icmp/icmp_main.c

   1 /*
   2  * ICMP
   3  *
   4  * Francois Gouget, 1999, based on the work of
   5  *   RW Hall, 1999, based on public domain code PING.C by Mike Muus (1983)
   6  *   and later works (c) 1989 Regents of Univ. of California - see copyright
   7  *   notice at end of source-code.
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 /* Future work:
  25  * - Systems like FreeBSD don't seem to support the IP_TTL option and maybe others.
  26  *   But using IP_HDRINCL and building the IP header by hand might work.
  27  * - Not all IP options are supported.
  28  * - Are ICMP handles real handles, i.e. inheritable and all? There might be some
  29  *   more work to do here, including server side stuff with synchronization.
  30  * - Is it correct to use malloc for the internal buffer, for allocating the
  31  *   handle's structure?
  32  * - This API should probably be thread safe. Is it really?
  33  * - Using the winsock functions has not been tested.
  34  */
  35
  36 #include "config.h"
  37
  38 #include <sys/types.h>
  39 #ifdef HAVE_SYS_SOCKET_H
  40 # include <sys/socket.h>
  41 #endif
  42 #ifdef HAVE_NETDB_H
  43 # include <netdb.h>
  44 #endif
  45 #ifdef HAVE_NETINET_IN_SYSTM_H
  46 # include <netinet/in_systm.h>
  47 #endif
  48 #ifdef HAVE_NETINET_IN_H
  49 # include <netinet/in.h>
  50 #endif
  51
  52 #include <sys/time.h>
  53 #include <string.h>
  54 #include <errno.h>
  55 #include <unistd.h>
  56 #ifdef HAVE_ARPA_INET_H
  57 # include <arpa/inet.h>
  58 #endif
  59
  60 #include "windef.h"
  61 #include "winbase.h"
  62 #ifdef ICMP_WIN
  63 #include "winsock2.h"
  64 #endif
  65
  66 #include "winerror.h"
  67 #include "wine/ipexport.h"
  68 #include "wine/icmpapi.h"
  69 #include "wine/debug.h"
  70
  71 /* Set up endiannes macros for the ip and ip_icmp BSD headers */
  72 #ifndef BIG_ENDIAN
  73 #define BIG_ENDIAN       4321
  74 #endif
  75 #ifndef LITTLE_ENDIAN
  76 #define LITTLE_ENDIAN    1234
  77 #endif
  78 #ifndef BYTE_ORDER
  79 #ifdef WORDS_BIGENDIAN
  80 #define BYTE_ORDER       BIG_ENDIAN
  81 #else
  82 #define BYTE_ORDER       LITTLE_ENDIAN
  83 #endif
  84 #endif /* BYTE_ORDER */
  85
  86 #define u_int16_t  WORD
  87 #define u_int32_t  DWORD
  88
  89 /* These are BSD headers. We use these here because they are needed on
  90  * libc5 Linux systems. On other platforms they are usually simply more
  91  * complete than the native stuff, and cause less portability problems
  92  * so we use them anyway.
  93  */
  94 #include "ip.h"
  95 #include "ip_icmp.h"
  96
  97
  98 WINE_DEFAULT_DEBUG_CHANNEL(icmp);
  99
 100 /* Define the following macro to use the winsock functions */
 101 /*#define ICMP_WIN*/
 102
 103 #ifdef ICMP_WIN
 104 /* FIXME: should we include winsock.h ???*/
 105 SOCKET WINAPI WINSOCK_socket(INT af, INT type, INT protocol);
 106 INT WINAPI WINSOCK_sendto(SOCKET s, char *buf, INT len, INT flags, struct sockaddr *to, INT tolen);
 107 INT WINAPI WINSOCK_recvfrom(SOCKET s, char *buf,INT len, INT flags, struct sockaddr *from, INT *fromlen32);
 108 INT WINAPI WINSOCK_shutdown(SOCKET s, INT how);
 109 #endif
 110
 111
 112 #ifdef ICMP_WIN
 113 #define ISOCK_SOCKET                SOCKET
 114 #define ISOCK_ISVALID(a)            ((a)!=INVALID_SOCKET)
 115 #define ISOCK_getsockopt(a,b,c,d,e) WINSOCK_getsockopt(a,b,c,d,e)
 116 #define ISOCK_recvfrom(a,b,c,d,e,f) WINSOCK_recvfrom(a,b,c,d,e,f)
 117 #define ISOCK_select(a,b,c,d,e)     WINSOCK_select(a,b,c,d,e)
 118 #define ISOCK_sendto(a,b,c,d,e,f)   WINSOCK_sendto(a,b,c,d,e,f)
 119 #define ISOCK_setsockopt(a,b,c,d,e) WINSOCK_setsockopt(a,b,c,d,e)
 120 #define ISOCK_shutdown(a,b)         WINSOCK_shutdown(a,b)
 121 #define ISOCK_socket(a,b,c)         WINSOCK_socket(a,b,c)
 122 #else
 123 #define ISOCK_SOCKET                int
 124 #define ISOCK_ISVALID(a)            ((a)>=0)
 125 #define ISOCK_getsockopt(a,b,c,d,e) getsockopt(a,b,c,d,e)
 126 #define ISOCK_recvfrom(a,b,c,d,e,f) recvfrom(a,b,c,d,e,f)
 127 #define ISOCK_select(a,b,c,d,e)     select(a,b,c,d,e)
 128 #define ISOCK_setsockopt(a,b,c,d,e) setsockopt(a,b,c,d,e)
 129 #define ISOCK_sendto(a,b,c,d,e,f)   sendto(a,b,c,d,e,f)
 130 #define ISOCK_shutdown(a,b)         shutdown(a,b)
 131 #define ISOCK_socket(a,b,c)         socket(a,b,c)
 132 #endif
 133
 134 typedef struct {
 135     ISOCK_SOCKET sid;
 136     IP_OPTION_INFORMATION default_opts;
 137 } icmp_t;
 138
 139 #define IP_OPTS_UNKNOWN     0
 140 #define IP_OPTS_DEFAULT     1
 141 #define IP_OPTS_CUSTOM      2
 142
 143 /* The sequence number is unique process wide, so that all threads
 144  * have a distinct sequence number.
 145  */
 146 static LONG icmp_sequence=0;
 147
 148 static int in_cksum(u_short *addr, int len)
 149 {
 150     int nleft=len;
 151     u_short *w = addr;
 152     int sum = 0;
 153     u_short answer = 0;
 154
 155     while (nleft > 1) {
 156         sum += *w++;
 157         nleft -= 2;
 158     }
 159
 160     if (nleft == 1) {
 161         *(u_char *)(&answer) = *(u_char *)w;
 162         sum += answer;
 163     }
 164
 165     sum = (sum >> 16) + (sum & 0xffff);
 166     sum  += (sum >> 16);
 167     answer = ~sum;
 168     return(answer);
 169 }
 170
 171
 172
 173 /*
 174  * Exported Routines.
 175  */
 176
 177 /***********************************************************************
 178  *              IcmpCreateFile (ICMP.@)
 179  */
 180 HANDLE WINAPI IcmpCreateFile(VOID)
 181 {
 182     icmp_t* icp;
 183
 184     ISOCK_SOCKET sid=ISOCK_socket(AF_INET,SOCK_RAW,IPPROTO_ICMP);
 185     if (!ISOCK_ISVALID(sid)) {
 186         MESSAGE("WARNING: Trying to use ICMP will fail unless running as root\n");
 187         SetLastError(ERROR_ACCESS_DENIED);
 188         return INVALID_HANDLE_VALUE;
 189     }
 190
 191     icp=HeapAlloc(GetProcessHeap(), 0, sizeof(*icp));
 192     if (icp==NULL) {
 193         SetLastError(IP_NO_RESOURCES);
 194         return INVALID_HANDLE_VALUE;
 195     }
 196     icp->sid=sid;
 197     icp->default_opts.OptionsSize=IP_OPTS_UNKNOWN;
 198     return (HANDLE)icp;
 199 }
 200
 201
 202 /***********************************************************************
 203  *              IcmpCloseHandle (ICMP.@)
 204  */
 205 BOOL WINAPI IcmpCloseHandle(HANDLE  IcmpHandle)
 206 {
 207     icmp_t* icp=(icmp_t*)IcmpHandle;
 208     if (IcmpHandle==INVALID_HANDLE_VALUE) {
 209         /* FIXME: in fact win98 seems to ignore the handle value !!! */
 210         SetLastError(ERROR_INVALID_HANDLE);
 211         return FALSE;
 212     }
 213
 214     ISOCK_shutdown(icp->sid,2);
 215     HeapFree(GetProcessHeap (), 0, icp);
 216     return TRUE;
 217 }
 218
 219
 220 /***********************************************************************
 221  *              IcmpSendEcho (ICMP.@)
 222  */
 223 DWORD WINAPI IcmpSendEcho(
 224     HANDLE                   IcmpHandle,
 225     IPAddr                   DestinationAddress,
 226     LPVOID                   RequestData,
 227     WORD                     RequestSize,
 228     PIP_OPTION_INFORMATION   RequestOptions,
 229     LPVOID                   ReplyBuffer,
 230     DWORD                    ReplySize,
 231     DWORD                    Timeout
 232     )
 233 {
 234     icmp_t* icp=(icmp_t*)IcmpHandle;
 235     unsigned char* reqbuf;
 236     int reqsize;
 237
 238     struct icmp_echo_reply* ier;
 239     struct ip* ip_header;
 240     struct icmp* icmp_header;
 241     char* endbuf;
 242     int ip_header_len;
 243     int maxlen;
 244     fd_set fdr;
 245     struct timeval timeout,send_time,recv_time;
 246     struct sockaddr_in addr;
 247     int addrlen;
 248     unsigned short id,seq,cksum;
 249     int res;
 250
 251     if (IcmpHandle==INVALID_HANDLE_VALUE) {
 252         /* FIXME: in fact win98 seems to ignore the handle value !!! */
 253         SetLastError(ERROR_INVALID_HANDLE);
 254         return 0;
 255     }
 256
 257     if (ReplySize<sizeof(ICMP_ECHO_REPLY)+ICMP_MINLEN) {
 258         SetLastError(IP_BUF_TOO_SMALL);
 259         return 0;
 260     }
 261     /* check the request size against SO_MAX_MSG_SIZE using getsockopt */
 262
 263     /* Prepare the request */
 264     id=getpid() & 0xFFFF;
 265     seq=InterlockedIncrement(&icmp_sequence) & 0xFFFF;
 266
 267     reqsize=ICMP_MINLEN+RequestSize;
 268     reqbuf=HeapAlloc(GetProcessHeap(), 0, reqsize);
 269     if (reqbuf==NULL) {
 270         SetLastError(ERROR_OUTOFMEMORY);
 271         return 0;
 272     }
 273
 274     icmp_header=(struct icmp*)reqbuf;
 275     icmp_header->icmp_type=ICMP_ECHO;
 276     icmp_header->icmp_code=0;
 277     icmp_header->icmp_cksum=0;
 278     icmp_header->icmp_id=id;
 279     icmp_header->icmp_seq=seq;
 280     memcpy(reqbuf+ICMP_MINLEN, RequestData, RequestSize);
 281     icmp_header->icmp_cksum=cksum=in_cksum((u_short*)reqbuf,reqsize);
 282
 283     addr.sin_family=AF_INET;
 284     addr.sin_addr.s_addr=DestinationAddress;
 285     addr.sin_port=0;
 286
 287     if (RequestOptions!=NULL) {
 288         int val;
 289         if (icp->default_opts.OptionsSize==IP_OPTS_UNKNOWN) {
 290             int len;
 291             /* Before we mess with the options, get the default values */
 292             len=sizeof(val);
 293             ISOCK_getsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,&len);
 294             icp->default_opts.Ttl=val;
 295
 296             len=sizeof(val);
 297             ISOCK_getsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,&len);
 298             icp->default_opts.Tos=val;
 299             /* FIXME: missing: handling of IP 'flags', and all the other options */
 300         }
 301
 302         val=RequestOptions->Ttl;
 303         ISOCK_setsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,sizeof(val));
 304         val=RequestOptions->Tos;
 305         ISOCK_setsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,sizeof(val));
 306         /* FIXME:  missing: handling of IP 'flags', and all the other options */
 307
 308         icp->default_opts.OptionsSize=IP_OPTS_CUSTOM;
 309     } else if (icp->default_opts.OptionsSize==IP_OPTS_CUSTOM) {
 310         int val;
 311
 312         /* Restore the default options */
 313         val=icp->default_opts.Ttl;
 314         ISOCK_setsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,sizeof(val));
 315         val=icp->default_opts.Tos;
 316         ISOCK_setsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,sizeof(val));
 317         /* FIXME: missing: handling of IP 'flags', and all the other options */
 318
 319         icp->default_opts.OptionsSize=IP_OPTS_DEFAULT;
 320     }
 321
 322     /* Get ready for receiving the reply
 323      * Do it before we send the request to minimize the risk of introducing delays
 324      */
 325     FD_ZERO(&fdr);
 326     FD_SET(icp->sid,&fdr);
 327     timeout.tv_sec=Timeout/1000;
 328     timeout.tv_usec=(Timeout % 1000)*1000;
 329     addrlen=sizeof(addr);
 330     ier=ReplyBuffer;
 331     ip_header=(struct ip *) ((char *) ReplyBuffer+sizeof(ICMP_ECHO_REPLY));
 332     endbuf=(char *) ReplyBuffer+ReplySize;
 333     maxlen=ReplySize-sizeof(ICMP_ECHO_REPLY);
 334
 335     /* Send the packet */
 336     TRACE("Sending %d bytes (RequestSize=%d) to %s\n", reqsize, RequestSize, inet_ntoa(addr.sin_addr));
 337 #if 0
 338     if (TRACE_ON(icmp)){
 339         unsigned char* buf=(unsigned char*)reqbuf;
 340         int i;
 341         printf("Output buffer:\n");
 342         for (i=0;i<reqsize;i++)
 343             printf("%2x,", buf[i]);
 344         printf("\n");
 345     }
 346 #endif
 347
 348     gettimeofday(&send_time,NULL);
 349     res=ISOCK_sendto(icp->sid, reqbuf, reqsize, 0, (struct sockaddr*)&addr, sizeof(addr));
 350     HeapFree(GetProcessHeap (), 0, reqbuf);
 351     if (res<0) {
 352         if (errno==EMSGSIZE)
 353             SetLastError(IP_PACKET_TOO_BIG);
 354         else {
 355             switch (errno) {
 356             case ENETUNREACH:
 357                 SetLastError(IP_DEST_NET_UNREACHABLE);
 358                 break;
 359             case EHOSTUNREACH:
 360                 SetLastError(IP_DEST_NET_UNREACHABLE);
 361                 break;
 362             default:
 363                 TRACE("unknown error: errno=%d\n",errno);
 364                 SetLastError(ERROR_UNKNOWN);
 365             }
 366         }
 367         return 0;
 368     }
 369
 370     /* Get the reply */
 371     ip_header_len=0; /* because gcc was complaining */
 372     while ((res=ISOCK_select(icp->sid+1,&fdr,NULL,NULL,&timeout))>0) {
 373         gettimeofday(&recv_time,NULL);
 374         res=ISOCK_recvfrom(icp->sid, (char*)ip_header, maxlen, 0, (struct sockaddr*)&addr,&addrlen);
 375         TRACE("received %d bytes from %s\n",res, inet_ntoa(addr.sin_addr));
 376         ier->Status=IP_REQ_TIMED_OUT;
 377
 378         /* Check whether we should ignore this packet */
 379         if ((ip_header->ip_p==IPPROTO_ICMP) && (res>=sizeof(struct ip)+ICMP_MINLEN)) {
 380             ip_header_len=ip_header->ip_hl << 2;
 381             icmp_header=(struct icmp*)(((char*)ip_header)+ip_header_len);
 382             TRACE("received an ICMP packet of type,code=%d,%d\n",icmp_header->icmp_type,icmp_header->icmp_code);
 383             if (icmp_header->icmp_type==ICMP_ECHOREPLY) {
 384                 if ((icmp_header->icmp_id==id) && (icmp_header->icmp_seq==seq))
 385                     ier->Status=IP_SUCCESS;
 386             } else {
 387                 switch (icmp_header->icmp_type) {
 388                 case ICMP_UNREACH:
 389                     switch (icmp_header->icmp_code) {
 390                     case ICMP_UNREACH_HOST:
 391 #ifdef ICMP_UNREACH_HOST_UNKNOWN
 392                     case ICMP_UNREACH_HOST_UNKNOWN:
 393 #endif
 394 #ifdef ICMP_UNREACH_ISOLATED
 395                     case ICMP_UNREACH_ISOLATED:
 396 #endif
 397 #ifdef ICMP_UNREACH_HOST_PROHIB
 398                     case ICMP_UNREACH_HOST_PROHIB:
 399 #endif
 400 #ifdef ICMP_UNREACH_TOSHOST
 401                     case ICMP_UNREACH_TOSHOST:
 402 #endif
 403                         ier->Status=IP_DEST_HOST_UNREACHABLE;
 404                         break;
 405                     case ICMP_UNREACH_PORT:
 406                         ier->Status=IP_DEST_PORT_UNREACHABLE;
 407                         break;
 408                     case ICMP_UNREACH_PROTOCOL:
 409                         ier->Status=IP_DEST_PROT_UNREACHABLE;
 410                         break;
 411                     case ICMP_UNREACH_SRCFAIL:
 412                         ier->Status=IP_BAD_ROUTE;
 413                         break;
 414                     default:
 415                         ier->Status=IP_DEST_NET_UNREACHABLE;
 416                     }
 417                     break;
 418                 case ICMP_TIMXCEED:
 419                     if (icmp_header->icmp_code==ICMP_TIMXCEED_REASS)
 420                         ier->Status=IP_TTL_EXPIRED_REASSEM;
 421                     else
 422                         ier->Status=IP_TTL_EXPIRED_TRANSIT;
 423                     break;
 424                 case ICMP_PARAMPROB:
 425                     ier->Status=IP_PARAM_PROBLEM;
 426                     break;
 427                 case ICMP_SOURCEQUENCH:
 428                     ier->Status=IP_SOURCE_QUENCH;
 429                     break;
 430                 }
 431                 if (ier->Status!=IP_REQ_TIMED_OUT) {
 432                     struct ip* rep_ip_header;
 433                     struct icmp* rep_icmp_header;
 434                     /* The ICMP header size of all the packets we accept is the same */
 435                     rep_ip_header=(struct ip*)(((char*)icmp_header)+ICMP_MINLEN);
 436                     rep_icmp_header=(struct icmp*)(((char*)rep_ip_header)+(rep_ip_header->ip_hl << 2));
 437
 438                     /* Make sure that this is really a reply to our packet */
 439                     if (ip_header_len+ICMP_MINLEN+(rep_ip_header->ip_hl << 2)+ICMP_MINLEN>ip_header->ip_len) {
 440                         ier->Status=IP_REQ_TIMED_OUT;
 441                     } else if ((rep_icmp_header->icmp_type!=ICMP_ECHO) ||
 442                         (rep_icmp_header->icmp_code!=0) ||
 443                         (rep_icmp_header->icmp_id!=id) ||
 444                         /* windows doesn't check this checksum, else tracert */
 445                         /* behind a Linux 2.2 masquerading firewall would fail*/
 446                         /* (rep_icmp_header->icmp_cksum!=cksum) || */
 447                         (rep_icmp_header->icmp_seq!=seq)) {
 448                         /* This was not a reply to one of our packets after all */
 449                         TRACE("skipping type,code=%d,%d id,seq=%d,%d cksum=%d\n",
 450                             rep_icmp_header->icmp_type,rep_icmp_header->icmp_code,
 451                             rep_icmp_header->icmp_id,rep_icmp_header->icmp_seq,
 452                             rep_icmp_header->icmp_cksum);
 453                         TRACE("expected type,code=8,0 id,seq=%d,%d cksum=%d\n",
 454                             id,seq,
 455                             cksum);
 456                         ier->Status=IP_REQ_TIMED_OUT;
 457                     }
 458                 }
 459             }
 460         }
 461
 462         if (ier->Status==IP_REQ_TIMED_OUT) {
 463             /* This packet was not for us.
 464              * Decrease the timeout so that we don't enter an endless loop even
 465              * if we get flooded with ICMP packets that are not for us.
 466              */
 467             timeout.tv_sec=Timeout/1000-(recv_time.tv_sec-send_time.tv_sec);
 468             timeout.tv_usec=(Timeout % 1000)*1000+send_time.tv_usec-(recv_time.tv_usec-send_time.tv_usec);
 469             if (timeout.tv_usec<0) {
 470                 timeout.tv_usec+=1000000;
 471                 timeout.tv_sec--;
 472             }
 473             continue;
 474         } else {
 475             /* This is a reply to our packet */
 476             memcpy(&ier->Address,&ip_header->ip_src,sizeof(IPAddr));
 477             /* Status is already set */
 478             ier->RoundTripTime=(recv_time.tv_sec-send_time.tv_sec)*1000+(recv_time.tv_usec-send_time.tv_usec)/1000;
 479             ier->DataSize=res-ip_header_len-ICMP_MINLEN;
 480             ier->Reserved=0;
 481             ier->Data=endbuf-ier->DataSize;
 482             memmove(ier->Data,((char*)ip_header)+ip_header_len+ICMP_MINLEN,ier->DataSize);
 483             ier->Options.Ttl=ip_header->ip_ttl;
 484             ier->Options.Tos=ip_header->ip_tos;
 485             ier->Options.Flags=ip_header->ip_off >> 13;
 486             ier->Options.OptionsSize=ip_header_len-sizeof(struct ip);
 487             if (ier->Options.OptionsSize!=0) {
 488                 ier->Options.OptionsData=(unsigned char *) ier->Data-ier->Options.OptionsSize;
 489                 /* FIXME: We are supposed to rearrange the option's 'source route' data */
 490                 memmove(ier->Options.OptionsData,((char*)ip_header)+ip_header_len,ier->Options.OptionsSize);
 491                 endbuf=ier->Options.OptionsData;
 492             } else {
 493                 ier->Options.OptionsData=NULL;
 494                 endbuf=ier->Data;
 495             }
 496
 497             /* Prepare for the next packet */
 498             ier++;
 499             ip_header=(struct ip*)(((char*)ip_header)+sizeof(ICMP_ECHO_REPLY));
 500             maxlen=endbuf-(char*)ip_header;
 501
 502             /* Check out whether there is more but don't wait this time */
 503             timeout.tv_sec=0;
 504             timeout.tv_usec=0;
 505         }
 506         FD_ZERO(&fdr);
 507         FD_SET(icp->sid,&fdr);
 508     }
 509     res=ier-(ICMP_ECHO_REPLY*)ReplyBuffer;
 510     if (res==0)
 511         SetLastError(IP_REQ_TIMED_OUT);
 512     TRACE("received %d replies\n",res);
 513     return res;
 514 }
 515
 516 /*
 517  * Copyright (c) 1989 The Regents of the University of California.
 518  * All rights reserved.
 519  *
 520  * This code is derived from software contributed to Berkeley by
 521  * Mike Muuss.
 522  *
 523  * Redistribution and use in source and binary forms, with or without
 524  * modification, are permitted provided that the following conditions
 525  * are met:
 526  * 1. Redistributions of source code must retain the above copyright
 527  *    notice, this list of conditions and the following disclaimer.
 528  * 2. Redistributions in binary form must reproduce the above copyright
 529  *    notice, this list of conditions and the following disclaimer in the
 530  *    documentation and/or other materials provided with the distribution.
 531  * 3. Neither the name of the University nor the names of its contributors
 532  *    may be used to endorse or promote products derived from this software
 533  *    without specific prior written permission.
 534  *
 535  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 536  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 537  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 538  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 539  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 540  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 541  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 542  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 543  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 544  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 545  * SUCH DAMAGE.
 546  *
 547  */