contrib/libpcap-0.8.3/pcap-win32.c

   1 /*
   2  * Copyright (c) 1999 - 2003
   3  * NetGroup, Politecnico di Torino (Italy)
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  * notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  * notice, this list of conditions and the following disclaimer in the
  14  * documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the Politecnico di Torino nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  *
  31  */
  32
  33 #ifndef lint
  34 static const char rcsid[] _U_ =
  35     "@(#) $Header: /tcpdump/master/libpcap/pcap-win32.c,v 1.15.2.3 2003/11/30 02:32:02 guy Exp $ (LBL)";
  36 #endif
  37
  38 #include <pcap-int.h>
  39 #include <packet32.h>
  40 #include <Ntddndis.h>
  41 #ifdef __MINGW32__
  42 int* _errno();
  43 #define errno (*_errno())
  44 #endif /* __MINGW32__ */
  45
  46 static int pcap_setfilter_win32(pcap_t *, struct bpf_program *);
  47 static int pcap_getnonblock_win32(pcap_t *, char *);
  48 static int pcap_setnonblock_win32(pcap_t *, int, char *);
  49
  50 #define PcapBufSize 256000      /*dimension of the buffer in the pcap_t structure*/
  51 #define SIZE_BUF 1000000
  52
  53 /*
  54  * Header that the WinPcap driver associates to the packets.
  55  * Once was in bpf.h
  56  */
  57 struct bpf_hdr {
  58         struct timeval  bh_tstamp;      /* time stamp */
  59         bpf_u_int32     bh_caplen;      /* length of captured portion */
  60         bpf_u_int32     bh_datalen;     /* original length of packet */
  61         u_short         bh_hdrlen;      /* length of bpf header (this struct
  62                                            plus alignment padding) */
  63 };
  64
  65 /* Start winsock */
  66 int
  67 wsockinit()
  68 {
  69         WORD wVersionRequested;
  70         WSADATA wsaData;
  71         int err;
  72         wVersionRequested = MAKEWORD( 1, 1);
  73         err = WSAStartup( wVersionRequested, &wsaData );
  74         if ( err != 0 )
  75         {
  76                 return -1;
  77         }
  78         return 0;
  79 }
  80
  81
  82 static int
  83 pcap_stats_win32(pcap_t *p, struct pcap_stat *ps)
  84 {
  85
  86         if(PacketGetStats(p->adapter, (struct bpf_stat*)ps) != TRUE){
  87                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "PacketGetStats error: %s", pcap_win32strerror());
  88                 return -1;
  89         }
  90
  91         return 0;
  92 }
  93
  94 static int
  95 pcap_read_win32(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
  96 {
  97         int cc;
  98         int n = 0;
  99         register u_char *bp, *ep;
 100
 101         cc = p->cc;
 102         if (p->cc == 0) {
 103                 /*
 104                  * Has "pcap_breakloop()" been called?
 105                  */
 106                 if (p->break_loop) {
 107                         /*
 108                          * Yes - clear the flag that indicates that it
 109                          * has, and return -2 to indicate that we were
 110                          * told to break out of the loop.
 111                          */
 112                         p->break_loop = 0;
 113                         return (-2);
 114                 }
 115
 116             /* capture the packets */
 117                 if(PacketReceivePacket(p->adapter,p->Packet,TRUE)==FALSE){
 118                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
 119                         return (-1);
 120                 }
 121
 122                 cc = p->Packet->ulBytesReceived;
 123
 124                 bp = p->Packet->Buffer;
 125         }
 126         else
 127                 bp = p->bp;
 128
 129         /*
 130          * Loop through each packet.
 131          */
 132 #define bhp ((struct bpf_hdr *)bp)
 133         ep = bp + cc;
 134         while (1) {
 135                 register int caplen, hdrlen;
 136
 137                 /*
 138                  * Has "pcap_breakloop()" been called?
 139                  * If so, return immediately - if we haven't read any
 140                  * packets, clear the flag and return -2 to indicate
 141                  * that we were told to break out of the loop, otherwise
 142                  * leave the flag set, so that the *next* call will break
 143                  * out of the loop without having read any packets, and
 144                  * return the number of packets we've processed so far.
 145                  */
 146                 if (p->break_loop) {
 147                         if (n == 0) {
 148                                 p->break_loop = 0;
 149                                 return (-2);
 150                         } else {
 151                                 p->bp = bp;
 152                                 p->cc = ep - bp;
 153                                 return (n);
 154                         }
 155                 }
 156                 if (bp >= ep)
 157                         break;
 158
 159                 caplen = bhp->bh_caplen;
 160                 hdrlen = bhp->bh_hdrlen;
 161
 162                 /*
 163                  * XXX A bpf_hdr matches a pcap_pkthdr.
 164                  */
 165                 (*callback)(user, (struct pcap_pkthdr*)bp, bp + hdrlen);
 166                 bp += BPF_WORDALIGN(caplen + hdrlen);
 167                 if (++n >= cnt && cnt > 0) {
 168                         p->bp = bp;
 169                         p->cc = ep - bp;
 170                         return (n);
 171                 }
 172         }
 173 #undef bhp
 174         p->cc = 0;
 175         return (n);
 176 }
 177
 178
 179 static void
 180 pcap_close_win32(pcap_t *p)
 181 {
 182         if (p->buffer != NULL)
 183                 free(p->buffer);
 184         if (p->adapter != NULL) {
 185                 PacketCloseAdapter(p->adapter);
 186                 p->adapter = NULL;
 187         }
 188 }
 189
 190 pcap_t *
 191 pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
 192     char *ebuf)
 193 {
 194         register pcap_t *p;
 195         NetType type;
 196
 197         /* Init WinSock */
 198         wsockinit();
 199
 200         p = (pcap_t *)malloc(sizeof(*p));
 201         if (p == NULL)
 202         {
 203                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
 204                 return (NULL);
 205         }
 206         memset(p, 0, sizeof(*p));
 207         p->adapter=NULL;
 208
 209         p->adapter = PacketOpenAdapter((char*)device);
 210
 211         if (p->adapter == NULL)
 212         {
 213                 /* Adapter detected but we are not able to open it. Return failure. */
 214                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Error opening adapter: %s", pcap_win32strerror());
 215                 return NULL;
 216         }
 217
 218         /*get network type*/
 219         if(PacketGetNetType (p->adapter,&type) == FALSE)
 220         {
 221                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Cannot determine the network type: %s", pcap_win32strerror());
 222                 goto bad;
 223         }
 224
 225         /*Set the linktype*/
 226         switch (type.LinkType)
 227         {
 228         case NdisMediumWan:
 229                 p->linktype = DLT_EN10MB;
 230                 break;
 231
 232         case NdisMedium802_3:
 233                 p->linktype = DLT_EN10MB;
 234                 break;
 235
 236         case NdisMediumFddi:
 237                 p->linktype = DLT_FDDI;
 238                 break;
 239
 240         case NdisMedium802_5:
 241                 p->linktype = DLT_IEEE802;
 242                 break;
 243
 244         case NdisMediumArcnetRaw:
 245                 p->linktype = DLT_ARCNET;
 246                 break;
 247
 248         case NdisMediumArcnet878_2:
 249                 p->linktype = DLT_ARCNET;
 250                 break;
 251
 252         case NdisMediumAtm:
 253                 p->linktype = DLT_ATM_RFC1483;
 254                 break;
 255
 256         default:
 257                 p->linktype = DLT_EN10MB;                       /*an unknown adapter is assumed to be ethernet*/
 258                 break;
 259         }
 260
 261         /* Set promisquous mode */
 262         if (promisc) PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS);
 263          else PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL);
 264
 265         /* Set the buffer size */
 266         p->bufsize = PcapBufSize;
 267
 268         p->buffer = (u_char *)malloc(PcapBufSize);
 269         if (p->buffer == NULL)
 270         {
 271                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
 272                 goto bad;
 273         }
 274
 275         p->snapshot = snaplen;
 276
 277         /* allocate Packet structure used during the capture */
 278         if((p->Packet = PacketAllocatePacket())==NULL)
 279         {
 280                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure");
 281                 goto bad;
 282         }
 283
 284         PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize);
 285
 286         /* allocate the standard buffer in the driver */
 287         if(PacketSetBuff( p->adapter, SIZE_BUF)==FALSE)
 288         {
 289                 snprintf(ebuf, PCAP_ERRBUF_SIZE,"driver error: not enough memory to allocate the kernel buffer\n");
 290                 goto bad;
 291         }
 292
 293         /* tell the driver to copy the buffer only if it contains at least 16K */
 294         if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
 295         {
 296                 snprintf(ebuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s\n", pcap_win32strerror());
 297                 goto bad;
 298         }
 299
 300         PacketSetReadTimeout(p->adapter, to_ms);
 301
 302         p->read_op = pcap_read_win32;
 303         p->setfilter_op = pcap_setfilter_win32;
 304         p->set_datalink_op = NULL;      /* can't change data link type */
 305         p->getnonblock_op = pcap_getnonblock_win32;
 306         p->setnonblock_op = pcap_setnonblock_win32;
 307         p->stats_op = pcap_stats_win32;
 308         p->close_op = pcap_close_win32;
 309
 310         return (p);
 311 bad:
 312         if (p->adapter)
 313             PacketCloseAdapter(p->adapter);
 314         if (p->buffer != NULL)
 315                 free(p->buffer);
 316         free(p);
 317         return (NULL);
 318 }
 319
 320
 321 static int
 322 pcap_setfilter_win32(pcap_t *p, struct bpf_program *fp)
 323 {
 324         if(PacketSetBpf(p->adapter,fp)==FALSE){
 325                 /* kernel filter not installed. */
 326                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Driver error: cannot set bpf filter: %s", pcap_win32strerror());
 327                 return (-1);
 328         }
 329         return (0);
 330 }
 331
 332
 333 static int
 334 pcap_getnonblock_win32(pcap_t *p, char *errbuf)
 335 {
 336         /*
 337          * XXX - if there were a PacketGetReadTimeout() call, we
 338          * would use it, and return 1 if the timeout is -1
 339          * and 0 otherwise.
 340          */
 341         return (p->nonblock);
 342 }
 343
 344 static int
 345 pcap_setnonblock_win32(pcap_t *p, int nonblock, char *errbuf)
 346 {
 347         int newtimeout;
 348
 349         if (nonblock) {
 350                 /*
 351                  * Set the read timeout to -1 for non-blocking mode.
 352                  */
 353                 newtimeout = -1;
 354         } else {
 355                 /*
 356                  * Restore the timeout set when the device was opened.
 357                  * (Note that this may be -1, in which case we're not
 358                  * really leaving non-blocking mode.)
 359                  */
 360                 newtimeout = p->timeout;
 361         }
 362         if (!PacketSetReadTimeout(p->adapter, newtimeout)) {
 363                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
 364                     "PacketSetReadTimeout: %s", pcap_win32strerror());
 365                 return (-1);
 366         }
 367         p->nonblock = (newtimeout == -1);
 368         return (0);
 369 }
 370
 371 /* Set the driver working mode */
 372 int
 373 pcap_setmode(pcap_t *p, int mode){
 374
 375         if (p->adapter==NULL)
 376         {
 377                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "impossible to set mode while reading from a file");
 378                 return -1;
 379         }
 380
 381         if(PacketSetMode(p->adapter,mode)==FALSE)
 382         {
 383                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
 384                 return -1;
 385         }
 386
 387         return 0;
 388 }
 389
 390 /* Send a packet to the network */
 391 int
 392 pcap_sendpacket(pcap_t *p, u_char *buf, int size){
 393         LPPACKET PacketToSend;
 394
 395         if (p->adapter==NULL)
 396         {
 397                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Writing a packet is allowed only on a physical adapter");
 398                 return -1;
 399         }
 400
 401         PacketToSend=PacketAllocatePacket();
 402         PacketInitPacket(PacketToSend,buf,size);
 403         if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){
 404                 PacketFreePacket(PacketToSend);
 405                 return -1;
 406         }
 407
 408         PacketFreePacket(PacketToSend);
 409         return 0;
 410 }
 411
 412 /* Set the dimension of the kernel-level capture buffer */
 413 int
 414 pcap_setbuff(pcap_t *p, int dim)
 415 {
 416         if (p->adapter==NULL)
 417         {
 418                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "The kernel buffer size cannot be set while reading from a file");
 419                 return -1;
 420         }
 421
 422         if(PacketSetBuff(p->adapter,dim)==FALSE)
 423         {
 424                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
 425                 return -1;
 426         }
 427         return 0;
 428 }
 429
 430 /*set the minimum amount of data that will release a read call*/
 431 int
 432 pcap_setmintocopy(pcap_t *p, int size)
 433 {
 434         if (p->adapter==NULL)
 435         {
 436                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Impossible to set the mintocopy parameter on an offline capture");
 437                 return -1;
 438         }
 439
 440         if(PacketSetMinToCopy(p->adapter, size)==FALSE)
 441         {
 442                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");
 443                 return -1;
 444         }
 445         return 0;
 446 }