dlls/iphlpapi/icmp.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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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  * - This API should probably be thread safe. Is it really?
  31  * - Using the winsock functions has not been tested.
  32  */
  33
  34 #include "config.h"
  35
  36 #include <sys/types.h>
  37 #ifdef HAVE_SYS_SOCKET_H
  38 # include <sys/socket.h>
  39 #endif
  40 #ifdef HAVE_NETDB_H
  41 # include <netdb.h>
  42 #endif
  43 #ifdef HAVE_NETINET_IN_SYSTM_H
  44 # include <netinet/in_systm.h>
  45 #endif
  46 #ifdef HAVE_NETINET_IN_H
  47 # include <netinet/in.h>
  48 #endif
  49
  50 #ifdef HAVE_SYS_TIME_H
  51 # include <sys/time.h>
  52 #endif
  53 #include <stdarg.h>
  54 #include <string.h>
  55 #include <errno.h>
  56 #ifdef HAVE_UNISTD_H
  57 # include <unistd.h>
  58 #endif
  59 #ifdef HAVE_ARPA_INET_H
  60 # include <arpa/inet.h>
  61 #endif
  62 #ifdef HAVE_SYS_POLL_H
  63 # include <sys/poll.h>
  64 #endif
  65
  66 #define USE_WS_PREFIX
  67
  68 #include "windef.h"
  69 #include "winbase.h"
  70 #include "winerror.h"
  71 #include "winternl.h"
  72 #include "ipexport.h"
  73 #include "icmpapi.h"
  74 #include "wine/debug.h"
  75
  76 /* Set up endianness macros for the ip and ip_icmp BSD headers */
  77 #ifndef BIG_ENDIAN
  78 #define BIG_ENDIAN       4321
  79 #endif
  80 #ifndef LITTLE_ENDIAN
  81 #define LITTLE_ENDIAN    1234
  82 #endif
  83 #ifndef BYTE_ORDER
  84 #ifdef WORDS_BIGENDIAN
  85 #define BYTE_ORDER       BIG_ENDIAN
  86 #else
  87 #define BYTE_ORDER       LITTLE_ENDIAN
  88 #endif
  89 #endif /* BYTE_ORDER */
  90
  91 #define u_int16_t  WORD
  92 #define u_int32_t  DWORD
  93
  94 /* These are BSD headers. We use these here because they are needed on
  95  * libc5 Linux systems. On other platforms they are usually simply more
  96  * complete than the native stuff, and cause less portability problems
  97  * so we use them anyway.
  98  */
  99 #include "ip.h"
 100 #include "ip_icmp.h"
 101
 102
 103 WINE_DEFAULT_DEBUG_CHANNEL(icmp);
 104 WINE_DECLARE_DEBUG_CHANNEL(winediag);
 105
 106
 107 typedef struct {
 108     int sid;
 109     IP_OPTION_INFORMATION default_opts;
 110 } icmp_t;
 111
 112 #define IP_OPTS_UNKNOWN     0
 113 #define IP_OPTS_DEFAULT     1
 114 #define IP_OPTS_CUSTOM      2
 115
 116 /* The sequence number is unique process wide, so that all threads
 117  * have a distinct sequence number.
 118  */
 119 static LONG icmp_sequence=0;
 120
 121 static int in_cksum(u_short *addr, int len)
 122 {
 123     int nleft=len;
 124     u_short *w = addr;
 125     int sum = 0;
 126     u_short answer = 0;
 127
 128     while (nleft > 1) {
 129         sum += *w++;
 130         nleft -= 2;
 131     }
 132
 133     if (nleft == 1) {
 134         *(u_char *)(&answer) = *(u_char *)w;
 135         sum += answer;
 136     }
 137
 138     sum = (sum >> 16) + (sum & 0xffff);
 139     sum  += (sum >> 16);
 140     answer = ~sum;
 141     return(answer);
 142 }
 143
 144
 145
 146 /*
 147  * Exported Routines.
 148  */
 149
 150 /***********************************************************************
 151  *              IcmpCreateFile (IPHLPAPI.@)
 152  */
 153 HANDLE WINAPI IcmpCreateFile(VOID)
 154 {
 155     icmp_t* icp;
 156
 157     int sid=socket(AF_INET,SOCK_RAW,IPPROTO_ICMP);
 158     if (sid < 0)
 159     {
 160         /* Mac OS X supports non-privileged ICMP via SOCK_DGRAM type. */
 161         sid=socket(AF_INET,SOCK_DGRAM,IPPROTO_ICMP);
 162     }
 163     if (sid < 0) {
 164         ERR_(winediag)("Failed to use ICMP (network ping), this requires special permissions.\n");
 165         SetLastError(ERROR_ACCESS_DENIED);
 166         return INVALID_HANDLE_VALUE;
 167     }
 168
 169     icp=HeapAlloc(GetProcessHeap(), 0, sizeof(*icp));
 170     if (icp==NULL) {
 171         close(sid);
 172         SetLastError(IP_NO_RESOURCES);
 173         return INVALID_HANDLE_VALUE;
 174     }
 175     icp->sid=sid;
 176     icp->default_opts.OptionsSize=IP_OPTS_UNKNOWN;
 177     return (HANDLE)icp;
 178 }
 179
 180
 181 /***********************************************************************
 182  *              IcmpCloseHandle (IPHLPAPI.@)
 183  */
 184 BOOL WINAPI IcmpCloseHandle(HANDLE  IcmpHandle)
 185 {
 186     icmp_t* icp=(icmp_t*)IcmpHandle;
 187     if (IcmpHandle==INVALID_HANDLE_VALUE) {
 188         /* FIXME: in fact win98 seems to ignore the handle value !!! */
 189         SetLastError(ERROR_INVALID_HANDLE);
 190         return FALSE;
 191     }
 192
 193     close( icp->sid );
 194     HeapFree(GetProcessHeap (), 0, icp);
 195     return TRUE;
 196 }
 197
 198
 199 /***********************************************************************
 200  *              IcmpSendEcho (IPHLPAPI.@)
 201  */
 202 DWORD WINAPI IcmpSendEcho(
 203     HANDLE                   IcmpHandle,
 204     IPAddr                   DestinationAddress,
 205     LPVOID                   RequestData,
 206     WORD                     RequestSize,
 207     PIP_OPTION_INFORMATION   RequestOptions,
 208     LPVOID                   ReplyBuffer,
 209     DWORD                    ReplySize,
 210     DWORD                    Timeout
 211     )
 212 {
 213     icmp_t* icp=(icmp_t*)IcmpHandle;
 214     unsigned char* reqbuf;
 215     int reqsize;
 216
 217     struct icmp_echo_reply* ier;
 218     struct ip* ip_header;
 219     struct icmp* icmp_header;
 220     char* endbuf;
 221     int ip_header_len;
 222     int maxlen;
 223     struct pollfd fdr;
 224     DWORD send_time,recv_time;
 225     struct sockaddr_in addr;
 226     unsigned int addrlen;
 227     unsigned short id,seq,cksum;
 228     int res;
 229
 230     if (IcmpHandle==INVALID_HANDLE_VALUE) {
 231         /* FIXME: in fact win98 seems to ignore the handle value !!! */
 232         SetLastError(ERROR_INVALID_HANDLE);
 233         return 0;
 234     }
 235
 236     if (ReplySize<sizeof(ICMP_ECHO_REPLY)+ICMP_MINLEN) {
 237         SetLastError(IP_BUF_TOO_SMALL);
 238         return 0;
 239     }
 240     /* check the request size against SO_MAX_MSG_SIZE using getsockopt */
 241
 242     /* Prepare the request */
 243     id=getpid() & 0xFFFF;
 244     seq=InterlockedIncrement(&icmp_sequence) & 0xFFFF;
 245
 246     reqsize=ICMP_MINLEN+RequestSize;
 247     reqbuf=HeapAlloc(GetProcessHeap(), 0, reqsize);
 248     if (reqbuf==NULL) {
 249         SetLastError(ERROR_OUTOFMEMORY);
 250         return 0;
 251     }
 252
 253     icmp_header=(struct icmp*)reqbuf;
 254     icmp_header->icmp_type=ICMP_ECHO;
 255     icmp_header->icmp_code=0;
 256     icmp_header->icmp_cksum=0;
 257     icmp_header->icmp_id=id;
 258     icmp_header->icmp_seq=seq;
 259     memcpy(reqbuf+ICMP_MINLEN, RequestData, RequestSize);
 260     icmp_header->icmp_cksum=cksum=in_cksum((u_short*)reqbuf,reqsize);
 261
 262     addr.sin_family=AF_INET;
 263     addr.sin_addr.s_addr=DestinationAddress;
 264     addr.sin_port=0;
 265
 266     if (RequestOptions!=NULL) {
 267         int val;
 268         if (icp->default_opts.OptionsSize==IP_OPTS_UNKNOWN) {
 269             unsigned int len;
 270             /* Before we mess with the options, get the default values */
 271             len=sizeof(val);
 272             getsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,&len);
 273             icp->default_opts.Ttl=val;
 274
 275             len=sizeof(val);
 276             getsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,&len);
 277             icp->default_opts.Tos=val;
 278             /* FIXME: missing: handling of IP 'flags', and all the other options */
 279         }
 280
 281         val=RequestOptions->Ttl;
 282         setsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,sizeof(val));
 283         val=RequestOptions->Tos;
 284         setsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,sizeof(val));
 285         /* FIXME:  missing: handling of IP 'flags', and all the other options */
 286
 287         icp->default_opts.OptionsSize=IP_OPTS_CUSTOM;
 288     } else if (icp->default_opts.OptionsSize==IP_OPTS_CUSTOM) {
 289         int val;
 290
 291         /* Restore the default options */
 292         val=icp->default_opts.Ttl;
 293         setsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,sizeof(val));
 294         val=icp->default_opts.Tos;
 295         setsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,sizeof(val));
 296         /* FIXME: missing: handling of IP 'flags', and all the other options */
 297
 298         icp->default_opts.OptionsSize=IP_OPTS_DEFAULT;
 299     }
 300
 301     /* Get ready for receiving the reply
 302      * Do it before we send the request to minimize the risk of introducing delays
 303      */
 304     fdr.fd = icp->sid;
 305     fdr.events = POLLIN;
 306     addrlen=sizeof(addr);
 307     ier=ReplyBuffer;
 308     ip_header=(struct ip *) ((char *) ReplyBuffer+sizeof(ICMP_ECHO_REPLY));
 309     endbuf=(char *) ReplyBuffer+ReplySize;
 310     maxlen=ReplySize-sizeof(ICMP_ECHO_REPLY);
 311
 312     /* Send the packet */
 313     TRACE("Sending %d bytes (RequestSize=%d) to %s\n", reqsize, RequestSize, inet_ntoa(addr.sin_addr));
 314 #if 0
 315     if (TRACE_ON(icmp)){
 316         unsigned char* buf=(unsigned char*)reqbuf;
 317         int i;
 318         printf("Output buffer:\n");
 319         for (i=0;i<reqsize;i++)
 320             printf("%2x,", buf[i]);
 321         printf("\n");
 322     }
 323 #endif
 324
 325     send_time = GetTickCount();
 326     res=sendto(icp->sid, reqbuf, reqsize, 0, (struct sockaddr*)&addr, sizeof(addr));
 327     HeapFree(GetProcessHeap (), 0, reqbuf);
 328     if (res<0) {
 329         if (errno==EMSGSIZE)
 330             SetLastError(IP_PACKET_TOO_BIG);
 331         else {
 332             switch (errno) {
 333             case ENETUNREACH:
 334                 SetLastError(IP_DEST_NET_UNREACHABLE);
 335                 break;
 336             case EHOSTUNREACH:
 337                 SetLastError(IP_DEST_HOST_UNREACHABLE);
 338                 break;
 339             default:
 340                 TRACE("unknown error: errno=%d\n",errno);
 341                 SetLastError(IP_GENERAL_FAILURE);
 342             }
 343         }
 344         return 0;
 345     }
 346
 347     /* Get the reply */
 348     ip_header_len=0; /* because gcc was complaining */
 349     while (poll(&fdr,1,Timeout)>0) {
 350         recv_time = GetTickCount();
 351         res=recvfrom(icp->sid, (char*)ip_header, maxlen, 0, (struct sockaddr*)&addr,&addrlen);
 352         TRACE("received %d bytes from %s\n",res, inet_ntoa(addr.sin_addr));
 353         ier->Status=IP_REQ_TIMED_OUT;
 354
 355         /* Check whether we should ignore this packet */
 356         if ((ip_header->ip_p==IPPROTO_ICMP) && (res>=sizeof(struct ip)+ICMP_MINLEN)) {
 357             ip_header_len=ip_header->ip_hl << 2;
 358             icmp_header=(struct icmp*)(((char*)ip_header)+ip_header_len);
 359             TRACE("received an ICMP packet of type,code=%d,%d\n",icmp_header->icmp_type,icmp_header->icmp_code);
 360             if (icmp_header->icmp_type==ICMP_ECHOREPLY) {
 361                 if ((icmp_header->icmp_id==id) && (icmp_header->icmp_seq==seq))
 362                     ier->Status=IP_SUCCESS;
 363             } else {
 364                 switch (icmp_header->icmp_type) {
 365                 case ICMP_UNREACH:
 366                     switch (icmp_header->icmp_code) {
 367                     case ICMP_UNREACH_HOST:
 368 #ifdef ICMP_UNREACH_HOST_UNKNOWN
 369                     case ICMP_UNREACH_HOST_UNKNOWN:
 370 #endif
 371 #ifdef ICMP_UNREACH_ISOLATED
 372                     case ICMP_UNREACH_ISOLATED:
 373 #endif
 374 #ifdef ICMP_UNREACH_HOST_PROHIB
 375                     case ICMP_UNREACH_HOST_PROHIB:
 376 #endif
 377 #ifdef ICMP_UNREACH_TOSHOST
 378                     case ICMP_UNREACH_TOSHOST:
 379 #endif
 380                         ier->Status=IP_DEST_HOST_UNREACHABLE;
 381                         break;
 382                     case ICMP_UNREACH_PORT:
 383                         ier->Status=IP_DEST_PORT_UNREACHABLE;
 384                         break;
 385                     case ICMP_UNREACH_PROTOCOL:
 386                         ier->Status=IP_DEST_PROT_UNREACHABLE;
 387                         break;
 388                     case ICMP_UNREACH_SRCFAIL:
 389                         ier->Status=IP_BAD_ROUTE;
 390                         break;
 391                     default:
 392                         ier->Status=IP_DEST_NET_UNREACHABLE;
 393                     }
 394                     break;
 395                 case ICMP_TIMXCEED:
 396                     if (icmp_header->icmp_code==ICMP_TIMXCEED_REASS)
 397                         ier->Status=IP_TTL_EXPIRED_REASSEM;
 398                     else
 399                         ier->Status=IP_TTL_EXPIRED_TRANSIT;
 400                     break;
 401                 case ICMP_PARAMPROB:
 402                     ier->Status=IP_PARAM_PROBLEM;
 403                     break;
 404                 case ICMP_SOURCEQUENCH:
 405                     ier->Status=IP_SOURCE_QUENCH;
 406                     break;
 407                 }
 408                 if (ier->Status!=IP_REQ_TIMED_OUT) {
 409                     struct ip* rep_ip_header;
 410                     struct icmp* rep_icmp_header;
 411                     /* The ICMP header size of all the packets we accept is the same */
 412                     rep_ip_header=(struct ip*)(((char*)icmp_header)+ICMP_MINLEN);
 413                     rep_icmp_header=(struct icmp*)(((char*)rep_ip_header)+(rep_ip_header->ip_hl << 2));
 414
 415                     /* Make sure that this is really a reply to our packet */
 416                     if (ip_header_len+ICMP_MINLEN+(rep_ip_header->ip_hl << 2)+ICMP_MINLEN>ip_header->ip_len) {
 417                         ier->Status=IP_REQ_TIMED_OUT;
 418                     } else if ((rep_icmp_header->icmp_type!=ICMP_ECHO) ||
 419                         (rep_icmp_header->icmp_code!=0) ||
 420                         (rep_icmp_header->icmp_id!=id) ||
 421                         /* windows doesn't check this checksum, else tracert */
 422                         /* behind a Linux 2.2 masquerading firewall would fail*/
 423                         /* (rep_icmp_header->icmp_cksum!=cksum) || */
 424                         (rep_icmp_header->icmp_seq!=seq)) {
 425                         /* This was not a reply to one of our packets after all */
 426                         TRACE("skipping type,code=%d,%d id,seq=%d,%d cksum=%d\n",
 427                             rep_icmp_header->icmp_type,rep_icmp_header->icmp_code,
 428                             rep_icmp_header->icmp_id,rep_icmp_header->icmp_seq,
 429                             rep_icmp_header->icmp_cksum);
 430                         TRACE("expected type,code=8,0 id,seq=%d,%d cksum=%d\n",
 431                             id,seq,
 432                             cksum);
 433                         ier->Status=IP_REQ_TIMED_OUT;
 434                     }
 435                 }
 436             }
 437         }
 438
 439         if (ier->Status==IP_REQ_TIMED_OUT) {
 440             /* This packet was not for us.
 441              * Decrease the timeout so that we don't enter an endless loop even
 442              * if we get flooded with ICMP packets that are not for us.
 443              */
 444             DWORD t = (recv_time - send_time);
 445             if (Timeout > t) Timeout -= t;
 446             else             Timeout = 0;
 447             continue;
 448         } else {
 449             /* This is a reply to our packet */
 450             memcpy(&ier->Address,&ip_header->ip_src,sizeof(IPAddr));
 451             /* Status is already set */
 452             ier->RoundTripTime= recv_time - send_time;
 453             ier->DataSize=res-ip_header_len-ICMP_MINLEN;
 454             ier->Reserved=0;
 455             ier->Data=endbuf-ier->DataSize;
 456             memmove(ier->Data,((char*)ip_header)+ip_header_len+ICMP_MINLEN,ier->DataSize);
 457             ier->Options.Ttl=ip_header->ip_ttl;
 458             ier->Options.Tos=ip_header->ip_tos;
 459             ier->Options.Flags=ip_header->ip_off >> 13;
 460             ier->Options.OptionsSize=ip_header_len-sizeof(struct ip);
 461             if (ier->Options.OptionsSize!=0) {
 462                 ier->Options.OptionsData=(unsigned char *) ier->Data-ier->Options.OptionsSize;
 463                 /* FIXME: We are supposed to rearrange the option's 'source route' data */
 464                 memmove(ier->Options.OptionsData,((char*)ip_header)+ip_header_len,ier->Options.OptionsSize);
 465                 endbuf=(char*)ier->Options.OptionsData;
 466             } else {
 467                 ier->Options.OptionsData=NULL;
 468                 endbuf=ier->Data;
 469             }
 470
 471             /* Prepare for the next packet */
 472             ier++;
 473             ip_header=(struct ip*)(((char*)ip_header)+sizeof(ICMP_ECHO_REPLY));
 474             maxlen=endbuf-(char*)ip_header;
 475
 476             /* Check out whether there is more but don't wait this time */
 477             Timeout=0;
 478         }
 479     }
 480     res=ier-(ICMP_ECHO_REPLY*)ReplyBuffer;
 481     if (res==0)
 482         SetLastError(IP_REQ_TIMED_OUT);
 483     TRACE("received %d replies\n",res);
 484     return res;
 485 }
 486
 487 /***********************************************************************
 488  *              IcmpSendEcho2 (IPHLPAPI.@)
 489  */
 490 DWORD WINAPI IcmpSendEcho2(
 491     HANDLE                   IcmpHandle,
 492     HANDLE                   Event,
 493     PIO_APC_ROUTINE          ApcRoutine,
 494     PVOID                    ApcContext,
 495     IPAddr                   DestinationAddress,
 496     LPVOID                   RequestData,
 497     WORD                     RequestSize,
 498     PIP_OPTION_INFORMATION   RequestOptions,
 499     LPVOID                   ReplyBuffer,
 500     DWORD                    ReplySize,
 501     DWORD                    Timeout
 502     )
 503 {
 504     TRACE("(%p, %p, %p, %p, %08x, %p, %d, %p, %p, %d, %d): stub\n", IcmpHandle,
 505             Event, ApcRoutine, ApcContext, DestinationAddress, RequestData,
 506             RequestSize, RequestOptions, ReplyBuffer, ReplySize, Timeout);
 507
 508     if (Event)
 509     {
 510         FIXME("unsupported for events\n");
 511         return 0;
 512     }
 513     if (ApcRoutine)
 514     {
 515         FIXME("unsupported for APCs\n");
 516         return 0;
 517     }
 518     return IcmpSendEcho(IcmpHandle, DestinationAddress, RequestData,
 519             RequestSize, RequestOptions, ReplyBuffer, ReplySize, Timeout);
 520 }
 521
 522 /***********************************************************************
 523  *              IcmpSendEcho2Ex (IPHLPAPI.@)
 524  */
 525 DWORD WINAPI IcmpSendEcho2Ex(
 526     HANDLE                   IcmpHandle,
 527     HANDLE                   Event,
 528     PIO_APC_ROUTINE          ApcRoutine,
 529     PVOID                    ApcContext,
 530     IPAddr                   SourceAddress,
 531     IPAddr                   DestinationAddress,
 532     LPVOID                   RequestData,
 533     WORD                     RequestSize,
 534     PIP_OPTION_INFORMATION   RequestOptions,
 535     LPVOID                   ReplyBuffer,
 536     DWORD                    ReplySize,
 537     DWORD                    Timeout
 538     )
 539 {
 540     TRACE("(%p, %p, %p, %p, %08x, %08x, %p, %d, %p, %p, %d, %d): stub\n", IcmpHandle,
 541             Event, ApcRoutine, ApcContext, SourceAddress, DestinationAddress, RequestData,
 542             RequestSize, RequestOptions, ReplyBuffer, ReplySize, Timeout);
 543
 544     if (Event)
 545     {
 546         FIXME("unsupported for events\n");
 547         return 0;
 548     }
 549     if (ApcRoutine)
 550     {
 551         FIXME("unsupported for APCs\n");
 552         return 0;
 553     }
 554     if (SourceAddress)
 555     {
 556         FIXME("unsupported for source addresses\n");
 557         return 0;
 558     }
 559
 560     return IcmpSendEcho(IcmpHandle, DestinationAddress, RequestData,
 561             RequestSize, RequestOptions, ReplyBuffer, ReplySize, Timeout);
 562 }
 563
 564 /*
 565  * Copyright (c) 1989 The Regents of the University of California.
 566  * All rights reserved.
 567  *
 568  * This code is derived from software contributed to Berkeley by
 569  * Mike Muuss.
 570  *
 571  * Redistribution and use in source and binary forms, with or without
 572  * modification, are permitted provided that the following conditions
 573  * are met:
 574  * 1. Redistributions of source code must retain the above copyright
 575  *    notice, this list of conditions and the following disclaimer.
 576  * 2. Redistributions in binary form must reproduce the above copyright
 577  *    notice, this list of conditions and the following disclaimer in the
 578  *    documentation and/or other materials provided with the distribution.
 579  * 3. Neither the name of the University nor the names of its contributors
 580  *    may be used to endorse or promote products derived from this software
 581  *    without specific prior written permission.
 582  *
 583  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 584  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 585  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 586  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 587  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 588  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 589  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 590  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 591  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 592  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 593  * SUCH DAMAGE.
 594  *
 595  */