icmp_main.c 17.7 KB
Newer Older
1 2 3 4
/*
 * ICMP
 *
 * Francois Gouget, 1999, based on the work of
5 6
 *   RW Hall, 1999, based on public domain code PING.C by Mike Muus (1983)
 *   and later works (c) 1989 Regents of Univ. of California - see copyright
7
 *   notice at end of source-code.
8 9 10 11 12 13 14 15 16 17 18 19 20 21
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
22 23 24 25 26 27
 */

/* Future work:
 * - Systems like FreeBSD don't seem to support the IP_TTL option and maybe others.
 *   But using IP_HDRINCL and building the IP header by hand might work.
 * - 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 32 33 34 35
 *   handle's structure?
 * - This API should probably be thread safe. Is it really?
 * - Using the winsock functions has not been tested.
 */

36
#include "config.h"
37

38 39 40 41
#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
42
#ifdef HAVE_NETDB_H
43 44 45 46
# include <netdb.h>
#endif
#ifdef HAVE_NETINET_IN_SYSTM_H
# include <netinet/in_systm.h>
47
#endif
48 49 50
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
51

52 53 54
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
55
#include <stdarg.h>
56 57
#include <string.h>
#include <errno.h>
58 59 60
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
61 62 63
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
64 65 66 67

#include "windef.h"
#include "winbase.h"
#include "winerror.h"
68 69
#include "ipexport.h"
#include "icmpapi.h"
70
#include "wine/debug.h"
71

72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
/* Set up endiannes macros for the ip and ip_icmp BSD headers */
#ifndef BIG_ENDIAN
#define BIG_ENDIAN       4321
#endif
#ifndef LITTLE_ENDIAN
#define LITTLE_ENDIAN    1234
#endif
#ifndef BYTE_ORDER
#ifdef WORDS_BIGENDIAN
#define BYTE_ORDER       BIG_ENDIAN
#else
#define BYTE_ORDER       LITTLE_ENDIAN
#endif
#endif /* BYTE_ORDER */

87 88 89
#define u_int16_t  WORD
#define u_int32_t  DWORD

90 91 92
/* These are BSD headers. We use these here because they are needed on
 * libc5 Linux systems. On other platforms they are usually simply more
 * complete than the native stuff, and cause less portability problems
93 94 95 96 97 98
 * so we use them anyway.
 */
#include "ip.h"
#include "ip_icmp.h"


99
WINE_DEFAULT_DEBUG_CHANNEL(icmp);
100 101 102


typedef struct {
103
    int sid;
104 105 106 107 108 109 110
    IP_OPTION_INFORMATION default_opts;
} icmp_t;

#define IP_OPTS_UNKNOWN     0
#define IP_OPTS_DEFAULT     1
#define IP_OPTS_CUSTOM      2

111
/* The sequence number is unique process wide, so that all threads
112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144
 * have a distinct sequence number.
 */
static LONG icmp_sequence=0;

static int in_cksum(u_short *addr, int len)
{
    int nleft=len;
    u_short *w = addr;
    int sum = 0;
    u_short answer = 0;

    while (nleft > 1) {
        sum += *w++;
        nleft -= 2;
    }

    if (nleft == 1) {
        *(u_char *)(&answer) = *(u_char *)w;
        sum += answer;
    }

    sum = (sum >> 16) + (sum & 0xffff);
    sum  += (sum >> 16);
    answer = ~sum;
    return(answer);
}



/*
 * Exported Routines.
 */

145
/***********************************************************************
146
 *		IcmpCreateFile (ICMP.@)
147
 */
148 149 150 151
HANDLE WINAPI IcmpCreateFile(VOID)
{
    icmp_t* icp;

152 153
    int sid=socket(AF_INET,SOCK_RAW,IPPROTO_ICMP);
    if (sid < 0) {
154
        MESSAGE("WARNING: Trying to use ICMP (network ping) will fail unless running as root\n");
155 156 157 158
        SetLastError(ERROR_ACCESS_DENIED);
        return INVALID_HANDLE_VALUE;
    }

159
    icp=HeapAlloc(GetProcessHeap(), 0, sizeof(*icp));
160 161 162 163 164 165 166 167 168 169
    if (icp==NULL) {
        SetLastError(IP_NO_RESOURCES);
        return INVALID_HANDLE_VALUE;
    }
    icp->sid=sid;
    icp->default_opts.OptionsSize=IP_OPTS_UNKNOWN;
    return (HANDLE)icp;
}


170
/***********************************************************************
171
 *		IcmpCloseHandle (ICMP.@)
172
 */
173 174 175
BOOL WINAPI IcmpCloseHandle(HANDLE  IcmpHandle)
{
    icmp_t* icp=(icmp_t*)IcmpHandle;
176 177 178 179 180
    if (IcmpHandle==INVALID_HANDLE_VALUE) {
        /* FIXME: in fact win98 seems to ignore the handle value !!! */
        SetLastError(ERROR_INVALID_HANDLE);
        return FALSE;
    }
181

182
    shutdown(icp->sid,2);
183
    HeapFree(GetProcessHeap (), 0, icp);
184 185 186 187
    return TRUE;
}


188
/***********************************************************************
189
 *		IcmpSendEcho (ICMP.@)
190
 */
191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218
DWORD WINAPI IcmpSendEcho(
    HANDLE                   IcmpHandle,
    IPAddr                   DestinationAddress,
    LPVOID                   RequestData,
    WORD                     RequestSize,
    PIP_OPTION_INFORMATION   RequestOptions,
    LPVOID                   ReplyBuffer,
    DWORD                    ReplySize,
    DWORD                    Timeout
    )
{
    icmp_t* icp=(icmp_t*)IcmpHandle;
    unsigned char* reqbuf;
    int reqsize;

    struct icmp_echo_reply* ier;
    struct ip* ip_header;
    struct icmp* icmp_header;
    char* endbuf;
    int ip_header_len;
    int maxlen;
    fd_set fdr;
    struct timeval timeout,send_time,recv_time;
    struct sockaddr_in addr;
    int addrlen;
    unsigned short id,seq,cksum;
    int res;

219 220 221 222 223 224
    if (IcmpHandle==INVALID_HANDLE_VALUE) {
        /* FIXME: in fact win98 seems to ignore the handle value !!! */
        SetLastError(ERROR_INVALID_HANDLE);
        return 0;
    }

225 226 227 228 229 230 231 232 233 234 235
    if (ReplySize<sizeof(ICMP_ECHO_REPLY)+ICMP_MINLEN) {
        SetLastError(IP_BUF_TOO_SMALL);
        return 0;
    }
    /* check the request size against SO_MAX_MSG_SIZE using getsockopt */

    /* Prepare the request */
    id=getpid() & 0xFFFF;
    seq=InterlockedIncrement(&icmp_sequence) & 0xFFFF;

    reqsize=ICMP_MINLEN+RequestSize;
236
    reqbuf=HeapAlloc(GetProcessHeap(), 0, reqsize);
237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260
    if (reqbuf==NULL) {
        SetLastError(ERROR_OUTOFMEMORY);
        return 0;
    }

    icmp_header=(struct icmp*)reqbuf;
    icmp_header->icmp_type=ICMP_ECHO;
    icmp_header->icmp_code=0;
    icmp_header->icmp_cksum=0;
    icmp_header->icmp_id=id;
    icmp_header->icmp_seq=seq;
    memcpy(reqbuf+ICMP_MINLEN, RequestData, RequestSize);
    icmp_header->icmp_cksum=cksum=in_cksum((u_short*)reqbuf,reqsize);

    addr.sin_family=AF_INET;
    addr.sin_addr.s_addr=DestinationAddress;
    addr.sin_port=0;

    if (RequestOptions!=NULL) {
        int val;
        if (icp->default_opts.OptionsSize==IP_OPTS_UNKNOWN) {
            int len;
            /* Before we mess with the options, get the default values */
            len=sizeof(val);
261
            getsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,&len);
262 263 264
            icp->default_opts.Ttl=val;

            len=sizeof(val);
265
            getsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,&len);
266 267 268 269 270
            icp->default_opts.Tos=val;
            /* FIXME: missing: handling of IP 'flags', and all the other options */
        }

        val=RequestOptions->Ttl;
271
        setsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,sizeof(val));
272
        val=RequestOptions->Tos;
273
        setsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,sizeof(val));
274 275 276 277 278 279 280 281
        /* FIXME:  missing: handling of IP 'flags', and all the other options */

        icp->default_opts.OptionsSize=IP_OPTS_CUSTOM;
    } else if (icp->default_opts.OptionsSize==IP_OPTS_CUSTOM) {
        int val;

        /* Restore the default options */
        val=icp->default_opts.Ttl;
282
        setsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,sizeof(val));
283
        val=icp->default_opts.Tos;
284
        setsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,sizeof(val));
285 286 287 288 289 290 291 292 293 294 295 296 297 298
        /* FIXME: missing: handling of IP 'flags', and all the other options */

        icp->default_opts.OptionsSize=IP_OPTS_DEFAULT;
    }

    /* Get ready for receiving the reply
     * Do it before we send the request to minimize the risk of introducing delays
     */
    FD_ZERO(&fdr);
    FD_SET(icp->sid,&fdr);
    timeout.tv_sec=Timeout/1000;
    timeout.tv_usec=(Timeout % 1000)*1000;
    addrlen=sizeof(addr);
    ier=ReplyBuffer;
299 300
    ip_header=(struct ip *) ((char *) ReplyBuffer+sizeof(ICMP_ECHO_REPLY));
    endbuf=(char *) ReplyBuffer+ReplySize;
301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316
    maxlen=ReplySize-sizeof(ICMP_ECHO_REPLY);

    /* Send the packet */
    TRACE("Sending %d bytes (RequestSize=%d) to %s\n", reqsize, RequestSize, inet_ntoa(addr.sin_addr));
#if 0
    if (TRACE_ON(icmp)){
        unsigned char* buf=(unsigned char*)reqbuf;
        int i;
        printf("Output buffer:\n");
        for (i=0;i<reqsize;i++)
            printf("%2x,", buf[i]);
        printf("\n");
    }
#endif

    gettimeofday(&send_time,NULL);
317
    res=sendto(icp->sid, reqbuf, reqsize, 0, (struct sockaddr*)&addr, sizeof(addr));
318
    HeapFree(GetProcessHeap (), 0, reqbuf);
319 320 321 322 323 324 325 326 327
    if (res<0) {
        if (errno==EMSGSIZE)
            SetLastError(IP_PACKET_TOO_BIG);
        else {
            switch (errno) {
            case ENETUNREACH:
                SetLastError(IP_DEST_NET_UNREACHABLE);
                break;
            case EHOSTUNREACH:
328
                SetLastError(IP_DEST_HOST_UNREACHABLE);
329 330 331
                break;
            default:
                TRACE("unknown error: errno=%d\n",errno);
332
                SetLastError(IP_GENERAL_FAILURE);
333 334 335 336 337 338 339
            }
        }
        return 0;
    }

    /* Get the reply */
    ip_header_len=0; /* because gcc was complaining */
340
    while ((res=select(icp->sid+1,&fdr,NULL,NULL,&timeout))>0) {
341
        gettimeofday(&recv_time,NULL);
342
        res=recvfrom(icp->sid, (char*)ip_header, maxlen, 0, (struct sockaddr*)&addr,&addrlen);
343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358
        TRACE("received %d bytes from %s\n",res, inet_ntoa(addr.sin_addr));
        ier->Status=IP_REQ_TIMED_OUT;

        /* Check whether we should ignore this packet */
        if ((ip_header->ip_p==IPPROTO_ICMP) && (res>=sizeof(struct ip)+ICMP_MINLEN)) {
            ip_header_len=ip_header->ip_hl << 2;
            icmp_header=(struct icmp*)(((char*)ip_header)+ip_header_len);
            TRACE("received an ICMP packet of type,code=%d,%d\n",icmp_header->icmp_type,icmp_header->icmp_code);
            if (icmp_header->icmp_type==ICMP_ECHOREPLY) {
                if ((icmp_header->icmp_id==id) && (icmp_header->icmp_seq==seq))
                    ier->Status=IP_SUCCESS;
            } else {
                switch (icmp_header->icmp_type) {
                case ICMP_UNREACH:
                    switch (icmp_header->icmp_code) {
                    case ICMP_UNREACH_HOST:
359
#ifdef ICMP_UNREACH_HOST_UNKNOWN
360
                    case ICMP_UNREACH_HOST_UNKNOWN:
361 362
#endif
#ifdef ICMP_UNREACH_ISOLATED
363
                    case ICMP_UNREACH_ISOLATED:
364 365
#endif
#ifdef ICMP_UNREACH_HOST_PROHIB
366
              	    case ICMP_UNREACH_HOST_PROHIB:
367 368
#endif
#ifdef ICMP_UNREACH_TOSHOST
369
                    case ICMP_UNREACH_TOSHOST:
370
#endif
371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411
                        ier->Status=IP_DEST_HOST_UNREACHABLE;
                        break;
                    case ICMP_UNREACH_PORT:
                        ier->Status=IP_DEST_PORT_UNREACHABLE;
                        break;
                    case ICMP_UNREACH_PROTOCOL:
                        ier->Status=IP_DEST_PROT_UNREACHABLE;
                        break;
                    case ICMP_UNREACH_SRCFAIL:
                        ier->Status=IP_BAD_ROUTE;
                        break;
                    default:
                        ier->Status=IP_DEST_NET_UNREACHABLE;
                    }
                    break;
                case ICMP_TIMXCEED:
                    if (icmp_header->icmp_code==ICMP_TIMXCEED_REASS)
                        ier->Status=IP_TTL_EXPIRED_REASSEM;
                    else
                        ier->Status=IP_TTL_EXPIRED_TRANSIT;
                    break;
                case ICMP_PARAMPROB:
                    ier->Status=IP_PARAM_PROBLEM;
                    break;
                case ICMP_SOURCEQUENCH:
                    ier->Status=IP_SOURCE_QUENCH;
                    break;
                }
                if (ier->Status!=IP_REQ_TIMED_OUT) {
                    struct ip* rep_ip_header;
                    struct icmp* rep_icmp_header;
                    /* The ICMP header size of all the packets we accept is the same */
                    rep_ip_header=(struct ip*)(((char*)icmp_header)+ICMP_MINLEN);
                    rep_icmp_header=(struct icmp*)(((char*)rep_ip_header)+(rep_ip_header->ip_hl << 2));

		    /* Make sure that this is really a reply to our packet */
                    if (ip_header_len+ICMP_MINLEN+(rep_ip_header->ip_hl << 2)+ICMP_MINLEN>ip_header->ip_len) {
			ier->Status=IP_REQ_TIMED_OUT;
                    } else if ((rep_icmp_header->icmp_type!=ICMP_ECHO) ||
                        (rep_icmp_header->icmp_code!=0) ||
                        (rep_icmp_header->icmp_id!=id) ||
412 413 414 415
                        /* windows doesn't check this checksum, else tracert */
                        /* behind a Linux 2.2 masquerading firewall would fail*/
                        /* (rep_icmp_header->icmp_cksum!=cksum) || */
                        (rep_icmp_header->icmp_seq!=seq)) {
416 417 418 419 420 421 422 423 424 425 426
                        /* This was not a reply to one of our packets after all */
                        TRACE("skipping type,code=%d,%d id,seq=%d,%d cksum=%d\n",
                            rep_icmp_header->icmp_type,rep_icmp_header->icmp_code,
                            rep_icmp_header->icmp_id,rep_icmp_header->icmp_seq,
                            rep_icmp_header->icmp_cksum);
                        TRACE("expected type,code=8,0 id,seq=%d,%d cksum=%d\n",
                            id,seq,
                            cksum);
			ier->Status=IP_REQ_TIMED_OUT;
		    }
                }
427
	    }
428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455
	}

        if (ier->Status==IP_REQ_TIMED_OUT) {
            /* This packet was not for us.
             * Decrease the timeout so that we don't enter an endless loop even
             * if we get flooded with ICMP packets that are not for us.
             */
            timeout.tv_sec=Timeout/1000-(recv_time.tv_sec-send_time.tv_sec);
            timeout.tv_usec=(Timeout % 1000)*1000+send_time.tv_usec-(recv_time.tv_usec-send_time.tv_usec);
            if (timeout.tv_usec<0) {
                timeout.tv_usec+=1000000;
                timeout.tv_sec--;
            }
            continue;
        } else {
            /* This is a reply to our packet */
            memcpy(&ier->Address,&ip_header->ip_src,sizeof(IPAddr));
            /* Status is already set */
            ier->RoundTripTime=(recv_time.tv_sec-send_time.tv_sec)*1000+(recv_time.tv_usec-send_time.tv_usec)/1000;
            ier->DataSize=res-ip_header_len-ICMP_MINLEN;
            ier->Reserved=0;
            ier->Data=endbuf-ier->DataSize;
            memmove(ier->Data,((char*)ip_header)+ip_header_len+ICMP_MINLEN,ier->DataSize);
            ier->Options.Ttl=ip_header->ip_ttl;
            ier->Options.Tos=ip_header->ip_tos;
            ier->Options.Flags=ip_header->ip_off >> 13;
            ier->Options.OptionsSize=ip_header_len-sizeof(struct ip);
            if (ier->Options.OptionsSize!=0) {
456
                ier->Options.OptionsData=(unsigned char *) ier->Data-ier->Options.OptionsSize;
457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498
                /* FIXME: We are supposed to rearrange the option's 'source route' data */
                memmove(ier->Options.OptionsData,((char*)ip_header)+ip_header_len,ier->Options.OptionsSize);
                endbuf=ier->Options.OptionsData;
            } else {
                ier->Options.OptionsData=NULL;
                endbuf=ier->Data;
            }

            /* Prepare for the next packet */
            ier++;
            ip_header=(struct ip*)(((char*)ip_header)+sizeof(ICMP_ECHO_REPLY));
            maxlen=endbuf-(char*)ip_header;

            /* Check out whether there is more but don't wait this time */
            timeout.tv_sec=0;
            timeout.tv_usec=0;
        }
        FD_ZERO(&fdr);
        FD_SET(icp->sid,&fdr);
    }
    res=ier-(ICMP_ECHO_REPLY*)ReplyBuffer;
    if (res==0)
        SetLastError(IP_REQ_TIMED_OUT);
    TRACE("received %d replies\n",res);
    return res;
}

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Mike Muuss.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
499
 * 3. Neither the name of the University nor the names of its contributors
500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */