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