The Tcpdump Group git mirrors - libpcap/blob - 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[] =
  35     "@(#) $Header: /tcpdump/master/libpcap/pcap-win32.c,v 1.14 2003-09-22 11:48:40 risso 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
  48 #define PcapBufSize 256000      /*dimension of the buffer in the pcap_t structure*/
  49 #define SIZE_BUF 1000000
  50
  51 /*
  52  * Header that the WinPcap driver associates to the packets.
  53  * Once was in bpf.h
  54  */
  55 struct bpf_hdr {
  56         struct timeval  bh_tstamp;      /* time stamp */
  57         bpf_u_int32     bh_caplen;      /* length of captured portion */
  58         bpf_u_int32     bh_datalen;     /* original length of packet */
  59         u_short         bh_hdrlen;      /* length of bpf header (this struct
  60                                            plus alignment padding) */
  61 };
  62
  63 /* Start winsock */
  64 int
  65 wsockinit()
  66 {
  67         WORD wVersionRequested;
  68         WSADATA wsaData;
  69         int err;
  70         wVersionRequested = MAKEWORD( 1, 1);
  71         err = WSAStartup( wVersionRequested, &wsaData );
  72         if ( err != 0 )
  73         {
  74                 return -1;
  75         }
  76         return 0;
  77 }
  78
  79
  80 static int
  81 pcap_stats_win32(pcap_t *p, struct pcap_stat *ps)
  82 {
  83
  84         if(PacketGetStats(p->adapter, (struct bpf_stat*)ps) != TRUE){
  85                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "PacketGetStats error: %s", pcap_win32strerror());
  86                 return -1;
  87         }
  88
  89         return 0;
  90 }
  91
  92 static int
  93 pcap_read_win32(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
  94 {
  95         int cc;
  96         int n = 0;
  97         register u_char *bp, *ep;
  98
  99         cc = p->cc;
 100         if (p->cc == 0) {
 101
 102             /* capture the packets */
 103                 if(PacketReceivePacket(p->adapter,p->Packet,TRUE)==FALSE){
 104                         snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
 105                         return (-1);
 106                 }
 107
 108                 cc = p->Packet->ulBytesReceived;
 109
 110                 bp = p->Packet->Buffer;
 111         }
 112         else
 113                 bp = p->bp;
 114
 115         /*
 116          * Loop through each packet.
 117          */
 118 #define bhp ((struct bpf_hdr *)bp)
 119         ep = bp + cc;
 120         while (bp < ep) {
 121                 register int caplen, hdrlen;
 122                 caplen = bhp->bh_caplen;
 123                 hdrlen = bhp->bh_hdrlen;
 124
 125                 /*
 126                  * XXX A bpf_hdr matches a pcap_pkthdr.
 127                  */
 128                 (*callback)(user, (struct pcap_pkthdr*)bp, bp + hdrlen);
 129                 bp += BPF_WORDALIGN(caplen + hdrlen);
 130                 if (++n >= cnt && cnt > 0) {
 131                         p->bp = bp;
 132                         p->cc = ep - bp;
 133                         return (n);
 134                 }
 135         }
 136 #undef bhp
 137         p->cc = 0;
 138         return (n);
 139 }
 140
 141
 142 static void
 143 pcap_close_win32(pcap_t *p)
 144 {
 145         if (p->buffer != NULL)
 146                 free(p->buffer);
 147         if (p->adapter != NULL) {
 148                 PacketCloseAdapter(p->adapter);
 149                 p->adapter = NULL;
 150         }
 151 }
 152
 153 pcap_t *
 154 pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
 155     char *ebuf)
 156 {
 157         register pcap_t *p;
 158         NetType type;
 159
 160         /* Init WinSock */
 161         wsockinit();
 162
 163         p = (pcap_t *)malloc(sizeof(*p));
 164         if (p == NULL)
 165         {
 166                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
 167                 return (NULL);
 168         }
 169         memset(p, 0, sizeof(*p));
 170         p->adapter=NULL;
 171
 172         p->adapter = PacketOpenAdapter((char*)device);
 173
 174         if (p->adapter == NULL)
 175         {
 176                 /* Adapter detected but we are not able to open it. Return failure. */
 177                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Error opening adapter: %s", pcap_win32strerror());
 178                 return NULL;
 179         }
 180
 181         /*get network type*/
 182         if(PacketGetNetType (p->adapter,&type) == FALSE)
 183         {
 184                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Cannot determine the network type: %s", pcap_win32strerror());
 185                 goto bad;
 186         }
 187
 188         /*Set the linktype*/
 189         switch (type.LinkType)
 190         {
 191         case NdisMediumWan:
 192                 p->linktype = DLT_EN10MB;
 193                 break;
 194
 195         case NdisMedium802_3:
 196                 p->linktype = DLT_EN10MB;
 197                 break;
 198
 199         case NdisMediumFddi:
 200                 p->linktype = DLT_FDDI;
 201                 break;
 202
 203         case NdisMedium802_5:
 204                 p->linktype = DLT_IEEE802;
 205                 break;
 206
 207         case NdisMediumArcnetRaw:
 208                 p->linktype = DLT_ARCNET;
 209                 break;
 210
 211         case NdisMediumArcnet878_2:
 212                 p->linktype = DLT_ARCNET;
 213                 break;
 214
 215         case NdisMediumAtm:
 216                 p->linktype = DLT_ATM_RFC1483;
 217                 break;
 218
 219         default:
 220                 p->linktype = DLT_EN10MB;                       /*an unknown adapter is assumed to be ethernet*/
 221                 break;
 222         }
 223
 224         /* Set promisquous mode */
 225         if (promisc) PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS);
 226          else PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL);
 227
 228         /* Set the buffer size */
 229         p->bufsize = PcapBufSize;
 230
 231         p->buffer = (u_char *)malloc(PcapBufSize);
 232         if (p->buffer == NULL)
 233         {
 234                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
 235                 goto bad;
 236         }
 237
 238         p->snapshot = snaplen;
 239
 240         /* allocate Packet structure used during the capture */
 241         if((p->Packet = PacketAllocatePacket())==NULL)
 242         {
 243                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure");
 244                 goto bad;
 245         }
 246
 247         PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize);
 248
 249         /* allocate the standard buffer in the driver */
 250         if(PacketSetBuff( p->adapter, SIZE_BUF)==FALSE)
 251         {
 252                 snprintf(ebuf, PCAP_ERRBUF_SIZE,"driver error: not enough memory to allocate the kernel buffer\n");
 253                 goto bad;
 254         }
 255
 256         /* tell the driver to copy the buffer only if it contains at least 16K */
 257         if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
 258         {
 259                 snprintf(ebuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s\n", pcap_win32strerror());
 260                 goto bad;
 261         }
 262
 263         PacketSetReadTimeout(p->adapter, to_ms);
 264
 265         p->read_op = pcap_read_win32;
 266         p->setfilter_op = pcap_setfilter_win32;
 267         p->set_datalink_op = NULL;      /* can't change data link type */
 268         p->stats_op = pcap_stats_win32;
 269         p->close_op = pcap_close_win32;
 270
 271         return (p);
 272 bad:
 273         if (p->adapter)
 274             PacketCloseAdapter(p->adapter);
 275         if (p->buffer != NULL)
 276                 free(p->buffer);
 277         free(p);
 278         return (NULL);
 279 }
 280
 281
 282 static int
 283 pcap_setfilter_win32(pcap_t *p, struct bpf_program *fp)
 284 {
 285         if(PacketSetBpf(p->adapter,fp)==FALSE){
 286                 /* kernel filter not installed. */
 287                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Driver error: cannot set bpf filter: %s", pcap_win32strerror());
 288                 return (-1);
 289         }
 290         return (0);
 291 }
 292
 293
 294 /* Set the driver working mode */
 295 int
 296 pcap_setmode(pcap_t *p, int mode){
 297
 298         if (p->adapter==NULL)
 299         {
 300                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "impossible to set mode while reading from a file");
 301                 return -1;
 302         }
 303
 304         if(PacketSetMode(p->adapter,mode)==FALSE)
 305         {
 306                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
 307                 return -1;
 308         }
 309
 310         return 0;
 311 }
 312
 313 /* Send a packet to the network */
 314 int
 315 pcap_sendpacket(pcap_t *p, u_char *buf, int size){
 316         LPPACKET PacketToSend;
 317
 318         if (p->adapter==NULL)
 319         {
 320                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Writing a packet is allowed only on a physical adapter");
 321                 return -1;
 322         }
 323
 324         PacketToSend=PacketAllocatePacket();
 325         PacketInitPacket(PacketToSend,buf,size);
 326         if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){
 327                 PacketFreePacket(PacketToSend);
 328                 return -1;
 329         }
 330
 331         PacketFreePacket(PacketToSend);
 332         return 0;
 333 }
 334
 335 /* Set the dimension of the kernel-level capture buffer */
 336 int
 337 pcap_setbuff(pcap_t *p, int dim)
 338 {
 339         if (p->adapter==NULL)
 340         {
 341                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "The kernel buffer size cannot be set while reading from a file");
 342                 return -1;
 343         }
 344
 345         if(PacketSetBuff(p->adapter,dim)==FALSE)
 346         {
 347                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
 348                 return -1;
 349         }
 350         return 0;
 351 }
 352
 353 /*set the minimum amount of data that will release a read call*/
 354 int
 355 pcap_setmintocopy(pcap_t *p, int size)
 356 {
 357         if (p->adapter==NULL)
 358         {
 359                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Impossible to set the mintocopy parameter on an offline capture");
 360                 return -1;
 361         }
 362
 363         if(PacketSetMinToCopy(p->adapter, size)==FALSE)
 364         {
 365                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");
 366                 return -1;
 367         }
 368         return 0;
 369 }