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 1.13 2003-07-25 05:32:05 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
  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                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
 166                 return (NULL);
 167         }
 168         memset(p, 0, sizeof(*p));
 169         p->adapter=NULL;
 170
 171         p->adapter=PacketOpenAdapter(device);
 172         if (p->adapter==NULL) {
 173                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Error opening adapter: %s", pcap_win32strerror());
 174                 return NULL;
 175         }
 176
 177         /*get network type*/
 178         if(PacketGetNetType (p->adapter,&type)==FALSE)
 179         {
 180                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "Cannot determine the network type: %s", pcap_win32strerror());
 181                 goto bad;
 182         }
 183
 184         /*Set the linktype*/
 185         switch (type.LinkType) {
 186
 187         case NdisMediumWan:
 188                 p->linktype = DLT_EN10MB;
 189         break;
 190
 191         case NdisMedium802_3:
 192                 p->linktype = DLT_EN10MB;
 193         break;
 194
 195         case NdisMediumFddi:
 196                 p->linktype = DLT_FDDI;
 197         break;
 198
 199         case NdisMedium802_5:
 200                 p->linktype = DLT_IEEE802;
 201         break;
 202
 203         case NdisMediumArcnetRaw:
 204                 p->linktype = DLT_ARCNET;
 205         break;
 206
 207         case NdisMediumArcnet878_2:
 208                 p->linktype = DLT_ARCNET;
 209         break;
 210
 211         case NdisMediumAtm:
 212                 p->linktype = DLT_ATM_RFC1483;
 213         break;
 214
 215         default:
 216                 p->linktype = DLT_EN10MB;                       /*an unknown adapter is assumed to be ethernet*/
 217         break;
 218         }
 219
 220         /* Set promisquous mode */
 221         if (promisc) PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS);
 222          else PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL);
 223
 224         /* Set the buffer size */
 225         p->bufsize = PcapBufSize;
 226
 227         p->buffer = (u_char *)malloc(PcapBufSize);
 228         if (p->buffer == NULL) {
 229                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
 230                 goto bad;
 231         }
 232
 233         p->snapshot = snaplen;
 234
 235         /* allocate Packet structure used during the capture */
 236         if((p->Packet = PacketAllocatePacket())==NULL){
 237                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure");
 238                 goto bad;
 239         }
 240
 241         PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize);
 242
 243         /* allocate the standard buffer in the driver */
 244         if(PacketSetBuff( p->adapter, SIZE_BUF)==FALSE)
 245         {
 246                 snprintf(ebuf, PCAP_ERRBUF_SIZE,"driver error: not enough memory to allocate the kernel buffer\n");
 247                 goto bad;
 248         }
 249
 250         /* tell the driver to copy the buffer only if it contains at least 16K */
 251         if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
 252         {
 253                 snprintf(ebuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s\n", pcap_win32strerror());
 254                 goto bad;
 255         }
 256
 257         PacketSetReadTimeout(p->adapter, to_ms);
 258
 259         p->read_op = pcap_read_win32;
 260         p->setfilter_op = pcap_setfilter_win32;
 261         p->set_datalink_op = NULL;      /* can't change data link type */
 262         p->stats_op = pcap_stats_win32;
 263         p->close_op = pcap_close_win32;
 264
 265         return (p);
 266 bad:
 267         if (p->adapter)
 268             PacketCloseAdapter(p->adapter);
 269         if (p->buffer != NULL)
 270                 free(p->buffer);
 271         free(p);
 272         return (NULL);
 273 }
 274
 275
 276 static int
 277 pcap_setfilter_win32(pcap_t *p, struct bpf_program *fp)
 278 {
 279         if(PacketSetBpf(p->adapter,fp)==FALSE){
 280                 /* kernel filter not installed. */
 281                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Driver error: cannot set bpf filter: %s", pcap_win32strerror());
 282                 return (-1);
 283         }
 284         return (0);
 285 }
 286
 287
 288 /* Set the driver working mode */
 289 int
 290 pcap_setmode(pcap_t *p, int mode){
 291
 292         if (p->adapter==NULL)
 293         {
 294                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "impossible to set mode while reading from a file");
 295                 return -1;
 296         }
 297
 298         if(PacketSetMode(p->adapter,mode)==FALSE)
 299         {
 300                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
 301                 return -1;
 302         }
 303
 304         return 0;
 305 }
 306
 307 /* Send a packet to the network */
 308 int
 309 pcap_sendpacket(pcap_t *p, u_char *buf, int size){
 310         LPPACKET PacketToSend;
 311
 312         if (p->adapter==NULL)
 313         {
 314                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Writing a packet is allowed only on a physical adapter");
 315                 return -1;
 316         }
 317
 318         PacketToSend=PacketAllocatePacket();
 319         PacketInitPacket(PacketToSend,buf,size);
 320         if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){
 321                 PacketFreePacket(PacketToSend);
 322                 return -1;
 323         }
 324
 325         PacketFreePacket(PacketToSend);
 326         return 0;
 327 }
 328
 329 /* Set the dimension of the kernel-level capture buffer */
 330 int
 331 pcap_setbuff(pcap_t *p, int dim)
 332 {
 333         if (p->adapter==NULL)
 334         {
 335                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "The kernel buffer size cannot be set while reading from a file");
 336                 return -1;
 337         }
 338
 339         if(PacketSetBuff(p->adapter,dim)==FALSE)
 340         {
 341                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
 342                 return -1;
 343         }
 344         return 0;
 345 }
 346
 347 /*set the minimum amount of data that will release a read call*/
 348 int
 349 pcap_setmintocopy(pcap_t *p, int size)
 350 {
 351         if (p->adapter==NULL)
 352         {
 353                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Impossible to set the mintocopy parameter on an offline capture");
 354                 return -1;
 355         }
 356
 357         if(PacketSetMinToCopy(p->adapter, size)==FALSE)
 358         {
 359                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");
 360                 return -1;
 361         }
 362         return 0;
 363 }