The Tcpdump Group git mirrors - libpcap/blob - pcap-dos.c

   1 /*
   2  *  This file is part of DOS-libpcap
   3  *  Ported to DOS/DOSX by G. Vanem <gvanem@yahoo.no>
   4  *
   5  *  pcap-dos.c: Interface to PKTDRVR, NDIS2 and 32-bit pmode
   6  *              network drivers.
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <signal.h>
  13 #include <float.h>
  14 #include <fcntl.h>
  15 #include <io.h>
  16
  17 #if defined(USE_32BIT_DRIVERS)
  18   #include "msdos/pm_drvr/pmdrvr.h"
  19   #include "msdos/pm_drvr/pci.h"
  20   #include "msdos/pm_drvr/bios32.h"
  21   #include "msdos/pm_drvr/module.h"
  22   #include "msdos/pm_drvr/3c501.h"
  23   #include "msdos/pm_drvr/3c503.h"
  24   #include "msdos/pm_drvr/3c509.h"
  25   #include "msdos/pm_drvr/3c59x.h"
  26   #include "msdos/pm_drvr/3c515.h"
  27   #include "msdos/pm_drvr/3c90x.h"
  28   #include "msdos/pm_drvr/3c575_cb.h"
  29   #include "msdos/pm_drvr/ne.h"
  30   #include "msdos/pm_drvr/wd.h"
  31   #include "msdos/pm_drvr/accton.h"
  32   #include "msdos/pm_drvr/cs89x0.h"
  33   #include "msdos/pm_drvr/rtl8139.h"
  34   #include "msdos/pm_drvr/ne2k-pci.h"
  35 #endif
  36
  37 #include "pcap.h"
  38 #include "pcap-dos.h"
  39 #include "pcap-int.h"
  40 #include "msdos/pktdrvr.h"
  41
  42 #ifdef USE_NDIS2
  43 #include "msdos/ndis2.h"
  44 #endif
  45
  46 #include <arpa/inet.h>
  47 #include <net/if.h>
  48 #include <net/if_arp.h>
  49 #include <net/if_ether.h>
  50 #include <net/if_packe.h>
  51 #include <tcp.h>
  52
  53 #if defined(USE_32BIT_DRIVERS)
  54   #define FLUSHK()       do { _printk_safe = 1; _printk_flush(); } while (0)
  55   #define NDIS_NEXT_DEV  &rtl8139_dev
  56
  57   static char *rx_pool = NULL;
  58   static void init_32bit (void);
  59
  60   static int  pktq_init     (struct rx_ringbuf *q, int size, int num, char *pool);
  61   static int  pktq_check    (struct rx_ringbuf *q);
  62   static int  pktq_inc_out  (struct rx_ringbuf *q);
  63   static int  pktq_in_index (struct rx_ringbuf *q) LOCKED_FUNC;
  64   static void pktq_clear    (struct rx_ringbuf *q) LOCKED_FUNC;
  65
  66   static struct rx_elem *pktq_in_elem  (struct rx_ringbuf *q) LOCKED_FUNC;
  67   static struct rx_elem *pktq_out_elem (struct rx_ringbuf *q);
  68
  69 #else
  70   #define FLUSHK()      ((void)0)
  71   #define NDIS_NEXT_DEV  NULL
  72 #endif
  73
  74 /*
  75  * Internal variables/functions in Watt-32
  76  */
  77 extern WORD  _pktdevclass;
  78 extern BOOL  _eth_is_init;
  79 extern int   _w32_dynamic_host;
  80 extern int   _watt_do_exit;
  81 extern int   _watt_is_init;
  82 extern int   _w32__bootp_on, _w32__dhcp_on, _w32__rarp_on, _w32__do_mask_req;
  83 extern void (*_w32_usr_post_init) (void);
  84 extern void (*_w32_print_hook)();
  85
  86 extern void dbug_write (const char *);  /* Watt-32 lib, pcdbug.c */
  87 extern int  pkt_get_mtu (void);
  88
  89 static int ref_count = 0;
  90
  91 static u_long mac_count    = 0;
  92 static u_long filter_count = 0;
  93
  94 static volatile BOOL exc_occured = 0;
  95
  96 static struct device *handle_to_device [20];
  97
  98 static int  pcap_activate_dos (pcap_t *p);
  99 static int  pcap_read_dos (pcap_t *p, int cnt, pcap_handler callback,
 100                            u_char *data);
 101 static void pcap_cleanup_dos (pcap_t *p);
 102 static int  pcap_stats_dos (pcap_t *p, struct pcap_stat *ps);
 103 static int  pcap_sendpacket_dos (pcap_t *p, const void *buf, size_t len);
 104 static int  pcap_setfilter_dos (pcap_t *p, struct bpf_program *fp);
 105
 106 static int  ndis_probe (struct device *dev);
 107 static int  pkt_probe  (struct device *dev);
 108
 109 static void close_driver (void);
 110 static int  init_watt32 (struct pcap *pcap, const char *dev_name, char *err_buf);
 111 static int  first_init (const char *name, char *ebuf, int promisc);
 112
 113 static void watt32_recv_hook (u_char *dummy, const struct pcap_pkthdr *pcap,
 114                               const u_char *buf);
 115
 116 /*
 117  * These are the device we always support
 118  */
 119 static struct device ndis_dev = {
 120               "ndis",
 121               "NDIS2 LanManager",
 122               0,
 123               0,0,0,0,0,0,
 124               NDIS_NEXT_DEV,  /* NULL or a 32-bit device */
 125               ndis_probe
 126             };
 127
 128 static struct device pkt_dev = {
 129               "pkt",
 130               "Packet-Driver",
 131               0,
 132               0,0,0,0,0,0,
 133               &ndis_dev,
 134               pkt_probe
 135             };
 136
 137 static struct device *get_device (int fd)
 138 {
 139   if (fd <= 0 || fd >= sizeof(handle_to_device)/sizeof(handle_to_device[0]))
 140      return (NULL);
 141   return handle_to_device [fd-1];
 142 }
 143
 144 /*
 145  * Private data for capturing on MS-DOS.
 146  */
 147 struct pcap_dos {
 148         void (*wait_proc)(void); /* call proc while waiting */
 149         struct pcap_stat stat;
 150 };
 151
 152 pcap_t *pcap_create_interface (const char *device _U_, char *ebuf)
 153 {
 154         pcap_t *p;
 155
 156         p = pcap_create_common(ebuf, sizeof (struct pcap_dos));
 157         if (p == NULL)
 158                 return (NULL);
 159
 160         p->activate_op = pcap_activate_dos;
 161         return (p);
 162 }
 163
 164 /*
 165  * Open MAC-driver with name 'device_name' for live capture of
 166  * network packets.
 167  */
 168 static int pcap_activate_dos (pcap_t *pcap)
 169 {
 170   if (pcap->opt.rfmon) {
 171     /*
 172      * No monitor mode on DOS.
 173      */
 174     return (PCAP_ERROR_RFMON_NOTSUP);
 175   }
 176
 177   /*
 178    * Turn a negative snapshot value (invalid), a snapshot value of
 179    * 0 (unspecified), or a value bigger than the normal maximum
 180    * value, into the maximum allowed value.
 181    *
 182    * If some application really *needs* a bigger snapshot
 183    * length, we should just increase MAXIMUM_SNAPLEN.
 184    */
 185   if (pcap->snapshot <= 0 || pcap->snapshot > MAXIMUM_SNAPLEN)
 186     pcap->snapshot = MAXIMUM_SNAPLEN;
 187
 188   if (pcap->snapshot < ETH_MIN+8)
 189       pcap->snapshot = ETH_MIN+8;
 190
 191   if (pcap->snapshot > ETH_MAX)   /* silently accept and truncate large MTUs */
 192       pcap->snapshot = ETH_MAX;
 193
 194   pcap->linktype          = DLT_EN10MB;  /* !! */
 195   pcap->cleanup_op        = pcap_cleanup_dos;
 196   pcap->read_op           = pcap_read_dos;
 197   pcap->stats_op          = pcap_stats_dos;
 198   pcap->inject_op         = pcap_sendpacket_dos;
 199   pcap->setfilter_op      = pcap_setfilter_dos;
 200   pcap->setdirection_op   = NULL;  /* Not implemented.*/
 201   pcap->fd                = ++ref_count;
 202
 203   pcap->bufsize = ETH_MAX+100;     /* add some margin */
 204   pcap->buffer = calloc (pcap->bufsize, 1);
 205
 206   if (pcap->fd == 1)  /* first time we're called */
 207   {
 208     if (!init_watt32(pcap, pcap->opt.device, pcap->errbuf) ||
 209         !first_init(pcap->opt.device, pcap->errbuf, pcap->opt.promisc))
 210     {
 211       /* XXX - free pcap->buffer? */
 212       return (PCAP_ERROR);
 213     }
 214     atexit (close_driver);
 215   }
 216   else if (stricmp(active_dev->name,pcap->opt.device))
 217   {
 218     pcap_snprintf (pcap->errbuf, PCAP_ERRBUF_SIZE,
 219                    "Cannot use different devices simultaneously "
 220                    "(`%s' vs. `%s')", active_dev->name, pcap->opt.device);
 221     /* XXX - free pcap->buffer? */
 222     return (PCAP_ERROR);
 223   }
 224   handle_to_device [pcap->fd-1] = active_dev;
 225   return (0);
 226 }
 227
 228 /*
 229  * Poll the receiver queue and call the pcap callback-handler
 230  * with the packet.
 231  */
 232 static int
 233 pcap_read_one (pcap_t *p, pcap_handler callback, u_char *data)
 234 {
 235   struct pcap_dos *pd = p->priv;
 236   struct pcap_pkthdr pcap;
 237   struct timeval     now, expiry = { 0,0 };
 238   int    rx_len = 0;
 239
 240   if (p->opt.timeout > 0)
 241   {
 242     gettimeofday2 (&now, NULL);
 243     expiry.tv_usec = now.tv_usec + 1000UL * p->opt.timeout;
 244     expiry.tv_sec  = now.tv_sec;
 245     while (expiry.tv_usec >= 1000000L)
 246     {
 247       expiry.tv_usec -= 1000000L;
 248       expiry.tv_sec++;
 249     }
 250   }
 251
 252   while (!exc_occured)
 253   {
 254     volatile struct device *dev; /* might be reset by sig_handler */
 255
 256     dev = get_device (p->fd);
 257     if (!dev)
 258        break;
 259
 260     PCAP_ASSERT (dev->copy_rx_buf || dev->peek_rx_buf);
 261     FLUSHK();
 262
 263     /* If driver has a zero-copy receive facility, peek at the queue,
 264      * filter it, do the callback and release the buffer.
 265      */
 266     if (dev->peek_rx_buf)
 267     {
 268       PCAP_ASSERT (dev->release_rx_buf);
 269       rx_len = (*dev->peek_rx_buf) (&p->buffer);
 270     }
 271     else
 272     {
 273       rx_len = (*dev->copy_rx_buf) (p->buffer, p->snapshot);
 274     }
 275
 276     if (rx_len > 0)  /* got a packet */
 277     {
 278       mac_count++;
 279
 280       FLUSHK();
 281
 282       pcap.caplen = min (rx_len, p->snapshot);
 283       pcap.len    = rx_len;
 284
 285       if (callback &&
 286           (!p->fcode.bf_insns || pcap_filter(p->fcode.bf_insns, p->buffer, pcap.len, pcap.caplen)))
 287       {
 288         filter_count++;
 289
 290         /* Fix-me!! Should be time of arrival. Not time of
 291          * capture.
 292          */
 293         gettimeofday2 (&pcap.ts, NULL);
 294         (*callback) (data, &pcap, p->buffer);
 295       }
 296
 297       if (dev->release_rx_buf)
 298         (*dev->release_rx_buf) (p->buffer);
 299
 300       if (pcap_pkt_debug > 0)
 301       {
 302         if (callback == watt32_recv_hook)
 303              dbug_write ("pcap_recv_hook\n");
 304         else dbug_write ("pcap_read_op\n");
 305       }
 306       FLUSHK();
 307       return (1);
 308     }
 309
 310     /* Has "pcap_breakloop()" been called?
 311      */
 312     if (p->break_loop) {
 313       /*
 314        * Yes - clear the flag that indicates that it
 315        * has, and return -2 to indicate that we were
 316        * told to break out of the loop.
 317        */
 318       p->break_loop = 0;
 319       return (-2);
 320     }
 321
 322     /* If not to wait for a packet or pcap_cleanup_dos() called from
 323      * e.g. SIGINT handler, exit loop now.
 324      */
 325     if (p->opt.timeout <= 0 || (volatile int)p->fd <= 0)
 326        break;
 327
 328     gettimeofday2 (&now, NULL);
 329
 330     if (timercmp(&now, &expiry, >))
 331        break;
 332
 333 #ifndef DJGPP
 334     kbhit();    /* a real CPU hog */
 335 #endif
 336
 337     if (pd->wait_proc)
 338       (*pd->wait_proc)();     /* call yield func */
 339   }
 340
 341   if (rx_len < 0)            /* receive error */
 342   {
 343     pd->stat.ps_drop++;
 344 #ifdef USE_32BIT_DRIVERS
 345     if (pcap_pkt_debug > 1)
 346        printk ("pkt-err %s\n", pktInfo.error);
 347 #endif
 348     return (-1);
 349   }
 350   return (0);
 351 }
 352
 353 static int
 354 pcap_read_dos (pcap_t *p, int cnt, pcap_handler callback, u_char *data)
 355 {
 356   int rc, num = 0;
 357
 358   while (num <= cnt || PACKET_COUNT_IS_UNLIMITED(cnt))
 359   {
 360     if (p->fd <= 0)
 361        return (-1);
 362     rc = pcap_read_one (p, callback, data);
 363     if (rc > 0)
 364        num++;
 365     if (rc < 0)
 366        break;
 367     _w32_os_yield();  /* allow SIGINT generation, yield to Win95/NT */
 368   }
 369   return (num);
 370 }
 371
 372 /*
 373  * Return network statistics
 374  */
 375 static int pcap_stats_dos (pcap_t *p, struct pcap_stat *ps)
 376 {
 377   struct net_device_stats *stats;
 378   struct pcap_dos         *pd;
 379   struct device           *dev = p ? get_device(p->fd) : NULL;
 380
 381   if (!dev)
 382   {
 383     strcpy (p->errbuf, "illegal pcap handle");
 384     return (-1);
 385   }
 386
 387   if (!dev->get_stats || (stats = (*dev->get_stats)(dev)) == NULL)
 388   {
 389     strcpy (p->errbuf, "device statistics not available");
 390     return (-1);
 391   }
 392
 393   FLUSHK();
 394
 395   pd = p->priv;
 396   pd->stat.ps_recv   = stats->rx_packets;
 397   pd->stat.ps_drop  += stats->rx_missed_errors;
 398   pd->stat.ps_ifdrop = stats->rx_dropped +  /* queue full */
 399                          stats->rx_errors;    /* HW errors */
 400   if (ps)
 401      *ps = pd->stat;
 402
 403   return (0);
 404 }
 405
 406 /*
 407  * Return detailed network/device statistics.
 408  * May be called after 'dev->close' is called.
 409  */
 410 int pcap_stats_ex (pcap_t *p, struct pcap_stat_ex *se)
 411 {
 412   struct device *dev = p ? get_device (p->fd) : NULL;
 413
 414   if (!dev || !dev->get_stats)
 415   {
 416     strlcpy (p->errbuf, "detailed device statistics not available",
 417              PCAP_ERRBUF_SIZE);
 418     return (-1);
 419   }
 420
 421   if (!strnicmp(dev->name,"pkt",3))
 422   {
 423     strlcpy (p->errbuf, "pktdrvr doesn't have detailed statistics",
 424              PCAP_ERRBUF_SIZE);
 425     return (-1);
 426   }
 427   memcpy (se, (*dev->get_stats)(dev), sizeof(*se));
 428   return (0);
 429 }
 430
 431 /*
 432  * Simply store the filter-code for the pcap_read_dos() callback
 433  * Some day the filter-code could be handed down to the active
 434  * device (pkt_rx1.s or 32-bit device interrupt handler).
 435  */
 436 static int pcap_setfilter_dos (pcap_t *p, struct bpf_program *fp)
 437 {
 438   if (!p)
 439      return (-1);
 440   p->fcode = *fp;
 441   return (0);
 442 }
 443
 444 /*
 445  * Return # of packets received in pcap_read_dos()
 446  */
 447 u_long pcap_mac_packets (void)
 448 {
 449   return (mac_count);
 450 }
 451
 452 /*
 453  * Return # of packets passed through filter in pcap_read_dos()
 454  */
 455 u_long pcap_filter_packets (void)
 456 {
 457   return (filter_count);
 458 }
 459
 460 /*
 461  * Close pcap device. Not called for offline captures.
 462  */
 463 static void pcap_cleanup_dos (pcap_t *p)
 464 {
 465   struct pcap_dos *pd;
 466
 467   if (!exc_occured)
 468   {
 469     pd = p->priv;
 470     if (pcap_stats(p,NULL) < 0)
 471        pd->stat.ps_drop = 0;
 472     if (!get_device(p->fd))
 473        return;
 474
 475     handle_to_device [p->fd-1] = NULL;
 476     p->fd = 0;
 477     if (ref_count > 0)
 478         ref_count--;
 479     if (ref_count > 0)
 480        return;
 481   }
 482   close_driver();
 483   /* XXX - call pcap_cleanup_live_common? */
 484 }
 485
 486 /*
 487  * Return the name of the 1st network interface,
 488  * or NULL if none can be found.
 489  */
 490 char *pcap_lookupdev (char *ebuf)
 491 {
 492   struct device *dev;
 493
 494 #ifdef USE_32BIT_DRIVERS
 495   init_32bit();
 496 #endif
 497
 498   for (dev = (struct device*)dev_base; dev; dev = dev->next)
 499   {
 500     PCAP_ASSERT (dev->probe);
 501
 502     if ((*dev->probe)(dev))
 503     {
 504       FLUSHK();
 505       probed_dev = (struct device*) dev; /* remember last probed device */
 506       return (char*) dev->name;
 507     }
 508   }
 509
 510   if (ebuf)
 511      strcpy (ebuf, "No driver found");
 512   return (NULL);
 513 }
 514
 515 /*
 516  * Gets localnet & netmask from Watt-32.
 517  */
 518 int pcap_lookupnet (const char *device, bpf_u_int32 *localnet,
 519                     bpf_u_int32 *netmask, char *errbuf)
 520 {
 521   DWORD mask, net;
 522
 523   if (!_watt_is_init)
 524   {
 525     strcpy (errbuf, "pcap_open_offline() or pcap_activate() must be "
 526                     "called first");
 527     return (-1);
 528   }
 529
 530   mask  = _w32_sin_mask;
 531   net = my_ip_addr & mask;
 532   if (net == 0)
 533   {
 534     if (IN_CLASSA(*netmask))
 535        net = IN_CLASSA_NET;
 536     else if (IN_CLASSB(*netmask))
 537        net = IN_CLASSB_NET;
 538     else if (IN_CLASSC(*netmask))
 539        net = IN_CLASSC_NET;
 540     else
 541     {
 542       pcap_snprintf (errbuf, PCAP_ERRBUF_SIZE, "inet class for 0x%lx unknown", mask);
 543       return (-1);
 544     }
 545   }
 546   *localnet = htonl (net);
 547   *netmask = htonl (mask);
 548
 549   ARGSUSED (device);
 550   return (0);
 551 }
 552
 553 /*
 554  * Get a list of all interfaces that are present and that we probe okay.
 555  * Returns -1 on error, 0 otherwise.
 556  * The list may be NULL epty if no interfaces were up and could be opened.
 557  */
 558 int pcap_platform_finddevs  (pcap_if_list_t *devlistp, char *errbuf)
 559 {
 560   struct device     *dev;
 561   pcap_if_t *curdev;
 562 #if 0   /* Pkt drivers should have no addresses */
 563   struct sockaddr_in sa_ll_1, sa_ll_2;
 564   struct sockaddr   *addr, *netmask, *broadaddr, *dstaddr;
 565 #endif
 566   int       ret = 0;
 567   int       found = 0;
 568
 569   for (dev = (struct device*)dev_base; dev; dev = dev->next)
 570   {
 571     PCAP_ASSERT (dev->probe);
 572
 573     if (!(*dev->probe)(dev))
 574        continue;
 575
 576     PCAP_ASSERT (dev->close);  /* set by probe routine */
 577     FLUSHK();
 578     (*dev->close) (dev);
 579
 580     /*
 581      * XXX - find out whether it's up or running?  Does that apply here?
 582      * Can we find out if anything's plugged into the adapter, if it's
 583      * a wired device, and set PCAP_IF_CONNECTION_STATUS_CONNECTED
 584      * or PCAP_IF_CONNECTION_STATUS_DISCONNECTED?
 585      */
 586     if ((curdev = add_dev(devlistp, dev->name, 0,
 587                 dev->long_name, errbuf)) == NULL)
 588     {
 589       ret = -1;
 590       break;
 591     }
 592     found = 1;
 593 #if 0   /* Pkt drivers should have no addresses */
 594     memset (&sa_ll_1, 0, sizeof(sa_ll_1));
 595     memset (&sa_ll_2, 0, sizeof(sa_ll_2));
 596     sa_ll_1.sin_family = AF_INET;
 597     sa_ll_2.sin_family = AF_INET;
 598
 599     addr      = (struct sockaddr*) &sa_ll_1;
 600     netmask   = (struct sockaddr*) &sa_ll_1;
 601     dstaddr   = (struct sockaddr*) &sa_ll_1;
 602     broadaddr = (struct sockaddr*) &sa_ll_2;
 603     memset (&sa_ll_2.sin_addr, 0xFF, sizeof(sa_ll_2.sin_addr));
 604
 605     if (add_addr_to_dev(curdev, addr, sizeof(*addr),
 606                         netmask, sizeof(*netmask),
 607                         broadaddr, sizeof(*broadaddr),
 608                         dstaddr, sizeof(*dstaddr), errbuf) < 0)
 609     {
 610       ret = -1;
 611       break;
 612     }
 613 #endif
 614   }
 615
 616   if (ret == 0 && !found)
 617      strcpy (errbuf, "No drivers found");
 618
 619   return (ret);
 620 }
 621
 622 /*
 623  * pcap_assert() is mainly used for debugging
 624  */
 625 void pcap_assert (const char *what, const char *file, unsigned line)
 626 {
 627   FLUSHK();
 628   fprintf (stderr, "%s (%u): Assertion \"%s\" failed\n",
 629            file, line, what);
 630   close_driver();
 631   _exit (-1);
 632 }
 633
 634 /*
 635  * For pcap_offline_read(): wait and yield between printing packets
 636  * to simulate the pace packets where actually recorded.
 637  */
 638 void pcap_set_wait (pcap_t *p, void (*yield)(void), int wait)
 639 {
 640   if (p)
 641   {
 642     struct pcap_dos *pd = p->priv;
 643
 644     pd->wait_proc  = yield;
 645     p->opt.timeout = wait;
 646   }
 647 }
 648
 649 /*
 650  * Initialise a named network device.
 651  */
 652 static struct device *
 653 open_driver (const char *dev_name, char *ebuf, int promisc)
 654 {
 655   struct device *dev;
 656
 657   for (dev = (struct device*)dev_base; dev; dev = dev->next)
 658   {
 659     PCAP_ASSERT (dev->name);
 660
 661     if (strcmp (dev_name,dev->name))
 662        continue;
 663
 664     if (!probed_dev)   /* user didn't call pcap_lookupdev() first */
 665     {
 666       PCAP_ASSERT (dev->probe);
 667
 668       if (!(*dev->probe)(dev))    /* call the xx_probe() function */
 669       {
 670         pcap_snprintf (ebuf, PCAP_ERRBUF_SIZE, "failed to detect device `%s'", dev_name);
 671         return (NULL);
 672       }
 673       probed_dev = dev;  /* device is probed okay and may be used */
 674     }
 675     else if (dev != probed_dev)
 676     {
 677       goto not_probed;
 678     }
 679
 680     FLUSHK();
 681
 682     /* Select what traffic to receive
 683      */
 684     if (promisc)
 685          dev->flags |=  (IFF_ALLMULTI | IFF_PROMISC);
 686     else dev->flags &= ~(IFF_ALLMULTI | IFF_PROMISC);
 687
 688     PCAP_ASSERT (dev->open);
 689
 690     if (!(*dev->open)(dev))
 691     {
 692       pcap_snprintf (ebuf, PCAP_ERRBUF_SIZE, "failed to activate device `%s'", dev_name);
 693       if (pktInfo.error && !strncmp(dev->name,"pkt",3))
 694       {
 695         strcat (ebuf, ": ");
 696         strcat (ebuf, pktInfo.error);
 697       }
 698       return (NULL);
 699     }
 700
 701     /* Some devices need this to operate in promiscous mode
 702      */
 703     if (promisc && dev->set_multicast_list)
 704        (*dev->set_multicast_list) (dev);
 705
 706     active_dev = dev;   /* remember our active device */
 707     break;
 708   }
 709
 710   /* 'dev_name' not matched in 'dev_base' list.
 711    */
 712   if (!dev)
 713   {
 714     pcap_snprintf (ebuf, PCAP_ERRBUF_SIZE, "device `%s' not supported", dev_name);
 715     return (NULL);
 716   }
 717
 718 not_probed:
 719   if (!probed_dev)
 720   {
 721     pcap_snprintf (ebuf, PCAP_ERRBUF_SIZE, "device `%s' not probed", dev_name);
 722     return (NULL);
 723   }
 724   return (dev);
 725 }
 726
 727 /*
 728  * Deinitialise MAC driver.
 729  * Set receive mode back to default mode.
 730  */
 731 static void close_driver (void)
 732 {
 733   /* !!todo: loop over all 'handle_to_device[]' ? */
 734   struct device *dev = active_dev;
 735
 736   if (dev && dev->close)
 737   {
 738     (*dev->close) (dev);
 739     FLUSHK();
 740   }
 741
 742   active_dev = NULL;
 743
 744 #ifdef USE_32BIT_DRIVERS
 745   if (rx_pool)
 746   {
 747     k_free (rx_pool);
 748     rx_pool = NULL;
 749   }
 750   if (dev)
 751      pcibios_exit();
 752 #endif
 753 }
 754
 755
 756 #ifdef __DJGPP__
 757 static void setup_signals (void (*handler)(int))
 758 {
 759   signal (SIGSEGV,handler);
 760   signal (SIGILL, handler);
 761   signal (SIGFPE, handler);
 762 }
 763
 764 static void exc_handler (int sig)
 765 {
 766 #ifdef USE_32BIT_DRIVERS
 767   if (active_dev->irq > 0)    /* excludes IRQ 0 */
 768   {
 769     disable_irq (active_dev->irq);
 770     irq_eoi_cmd (active_dev->irq);
 771     _printk_safe = 1;
 772   }
 773 #endif
 774
 775   switch (sig)
 776   {
 777     case SIGSEGV:
 778          fputs ("Catching SIGSEGV.\n", stderr);
 779          break;
 780     case SIGILL:
 781          fputs ("Catching SIGILL.\n", stderr);
 782          break;
 783     case SIGFPE:
 784          _fpreset();
 785          fputs ("Catching SIGFPE.\n", stderr);
 786          break;
 787     default:
 788          fprintf (stderr, "Catching signal %d.\n", sig);
 789   }
 790   exc_occured = 1;
 791   close_driver();
 792 }
 793 #endif  /* __DJGPP__ */
 794
 795
 796 /*
 797  * Open the pcap device for the first client calling pcap_activate()
 798  */
 799 static int first_init (const char *name, char *ebuf, int promisc)
 800 {
 801   struct device *dev;
 802
 803 #ifdef USE_32BIT_DRIVERS
 804   rx_pool = k_calloc (RECEIVE_BUF_SIZE, RECEIVE_QUEUE_SIZE);
 805   if (!rx_pool)
 806   {
 807     strcpy (ebuf, "Not enough memory (Rx pool)");
 808     return (0);
 809   }
 810 #endif
 811
 812 #ifdef __DJGPP__
 813   setup_signals (exc_handler);
 814 #endif
 815
 816 #ifdef USE_32BIT_DRIVERS
 817   init_32bit();
 818 #endif
 819
 820   dev = open_driver (name, ebuf, promisc);
 821   if (!dev)
 822   {
 823 #ifdef USE_32BIT_DRIVERS
 824     k_free (rx_pool);
 825     rx_pool = NULL;
 826 #endif
 827
 828 #ifdef __DJGPP__
 829     setup_signals (SIG_DFL);
 830 #endif
 831     return (0);
 832   }
 833
 834 #ifdef USE_32BIT_DRIVERS
 835   /*
 836    * If driver is NOT a 16-bit "pkt/ndis" driver (having a 'copy_rx_buf'
 837    * set in it's probe handler), initialise near-memory ring-buffer for
 838    * the 32-bit device.
 839    */
 840   if (dev->copy_rx_buf == NULL)
 841   {
 842     dev->get_rx_buf     = get_rxbuf;
 843     dev->peek_rx_buf    = peek_rxbuf;
 844     dev->release_rx_buf = release_rxbuf;
 845     pktq_init (&dev->queue, RECEIVE_BUF_SIZE, RECEIVE_QUEUE_SIZE, rx_pool);
 846   }
 847 #endif
 848   return (1);
 849 }
 850
 851 #ifdef USE_32BIT_DRIVERS
 852 static void init_32bit (void)
 853 {
 854   static int init_pci = 0;
 855
 856   if (!_printk_file)
 857      _printk_init (64*1024, NULL); /* calls atexit(printk_exit) */
 858
 859   if (!init_pci)
 860      (void)pci_init();             /* init BIOS32+PCI interface */
 861   init_pci = 1;
 862 }
 863 #endif
 864
 865
 866 /*
 867  * Hook functions for using Watt-32 together with pcap
 868  */
 869 static char rxbuf [ETH_MAX+100]; /* rx-buffer with some margin */
 870 static WORD etype;
 871 static pcap_t pcap_save;
 872
 873 static void watt32_recv_hook (u_char *dummy, const struct pcap_pkthdr *pcap,
 874                               const u_char *buf)
 875 {
 876   /* Fix me: assumes Ethernet II only */
 877   struct ether_header *ep = (struct ether_header*) buf;
 878
 879   memcpy (rxbuf, buf, pcap->caplen);
 880   etype = ep->ether_type;
 881   ARGSUSED (dummy);
 882 }
 883
 884 #if (WATTCP_VER >= 0x0224)
 885 /*
 886  * This function is used by Watt-32 to poll for a packet.
 887  * i.e. it's set to bypass _eth_arrived()
 888  */
 889 static void *pcap_recv_hook (WORD *type)
 890 {
 891   int len = pcap_read_dos (&pcap_save, 1, watt32_recv_hook, NULL);
 892
 893   if (len < 0)
 894      return (NULL);
 895
 896   *type = etype;
 897   return (void*) &rxbuf;
 898 }
 899
 900 /*
 901  * This function is called by Watt-32 (via _eth_xmit_hook).
 902  * If dbug_init() was called, we should trace packets sent.
 903  */
 904 static int pcap_xmit_hook (const void *buf, unsigned len)
 905 {
 906   int rc = 0;
 907
 908   if (pcap_pkt_debug > 0)
 909      dbug_write ("pcap_xmit_hook: ");
 910
 911   if (active_dev && active_dev->xmit)
 912      if ((*active_dev->xmit) (active_dev, buf, len) > 0)
 913         rc = len;
 914
 915   if (pcap_pkt_debug > 0)
 916      dbug_write (rc ? "ok\n" : "fail\n");
 917   return (rc);
 918 }
 919 #endif
 920
 921 static int pcap_sendpacket_dos (pcap_t *p, const void *buf, size_t len)
 922 {
 923   struct device *dev = p ? get_device(p->fd) : NULL;
 924
 925   if (!dev || !dev->xmit)
 926      return (-1);
 927   return (*dev->xmit) (dev, buf, len);
 928 }
 929
 930 /*
 931  * This function is called by Watt-32 in tcp_post_init().
 932  * We should prevent Watt-32 from using BOOTP/DHCP/RARP etc.
 933  */
 934 static void (*prev_post_hook) (void);
 935
 936 static void pcap_init_hook (void)
 937 {
 938   _w32__bootp_on = _w32__dhcp_on = _w32__rarp_on = 0;
 939   _w32__do_mask_req = 0;
 940   _w32_dynamic_host = 0;
 941   if (prev_post_hook)
 942     (*prev_post_hook)();
 943 }
 944
 945 /*
 946  * Supress PRINT message from Watt-32's sock_init()
 947  */
 948 static void null_print (void) {}
 949
 950 /*
 951  * To use features of Watt-32 (netdb functions and socket etc.)
 952  * we must call sock_init(). But we set various hooks to prevent
 953  * using normal PKTDRVR functions in pcpkt.c. This should hopefully
 954  * make Watt-32 and pcap co-operate.
 955  */
 956 static int init_watt32 (struct pcap *pcap, const char *dev_name, char *err_buf)
 957 {
 958   char *env;
 959   int   rc, MTU, has_ip_addr;
 960   int   using_pktdrv = 1;
 961
 962   /* If user called sock_init() first, we need to reinit in
 963    * order to open debug/trace-file properly
 964    */
 965   if (_watt_is_init)
 966      sock_exit();
 967
 968   env = getenv ("PCAP_TRACE");
 969   if (env && atoi(env) > 0 &&
 970       pcap_pkt_debug < 0)   /* if not already set */
 971   {
 972     dbug_init();
 973     pcap_pkt_debug = atoi (env);
 974   }
 975
 976   _watt_do_exit      = 0;    /* prevent sock_init() calling exit() */
 977   prev_post_hook     = _w32_usr_post_init;
 978   _w32_usr_post_init = pcap_init_hook;
 979   _w32_print_hook    = null_print;
 980
 981   if (dev_name && strncmp(dev_name,"pkt",3))
 982      using_pktdrv = FALSE;
 983
 984   rc = sock_init();
 985   has_ip_addr = (rc != 8);  /* IP-address assignment failed */
 986
 987   /* if pcap is using a 32-bit driver w/o a pktdrvr loaded, we
 988    * just pretend Watt-32 is initialised okay.
 989    *
 990    * !! fix-me: The Watt-32 config isn't done if no pktdrvr
 991    *            was found. In that case my_ip_addr + sin_mask
 992    *            have default values. Should be taken from another
 993    *            ini-file/environment in any case (ref. tcpdump.ini)
 994    */
 995   _watt_is_init = 1;
 996
 997   if (!using_pktdrv || !has_ip_addr)  /* for now .... */
 998   {
 999     static const char myip[] = "192.168.0.1";
1000     static const char mask[] = "255.255.255.0";
1001
1002     printf ("Just guessing, using IP %s and netmask %s\n", myip, mask);
1003     my_ip_addr    = aton (myip);
1004     _w32_sin_mask = aton (mask);
1005   }
1006   else if (rc && using_pktdrv)
1007   {
1008     pcap_snprintf (err_buf, PCAP_ERRBUF_SIZE, "sock_init() failed, code %d", rc);
1009     return (0);
1010   }
1011
1012   /* Set recv-hook for peeking in _eth_arrived().
1013    */
1014 #if (WATTCP_VER >= 0x0224)
1015   _eth_recv_hook = pcap_recv_hook;
1016   _eth_xmit_hook = pcap_xmit_hook;
1017 #endif
1018
1019   /* Free the pkt-drvr handle allocated in pkt_init().
1020    * The above hooks should thus use the handle reopened in open_driver()
1021    */
1022   if (using_pktdrv)
1023   {
1024     _eth_release();
1025 /*  _eth_is_init = 1; */  /* hack to get Rx/Tx-hooks in Watt-32 working */
1026   }
1027
1028   memcpy (&pcap_save, pcap, sizeof(pcap_save));
1029   MTU = pkt_get_mtu();
1030   pcap_save.fcode.bf_insns = NULL;
1031   pcap_save.linktype       = _eth_get_hwtype (NULL, NULL);
1032   pcap_save.snapshot       = MTU > 0 ? MTU : ETH_MAX; /* assume 1514 */
1033
1034 #if 1
1035   /* prevent use of resolve() and resolve_ip()
1036    */
1037   last_nameserver = 0;
1038 #endif
1039   return (1);
1040 }
1041
1042 int EISA_bus = 0;  /* Where is natural place for this? */
1043
1044 /*
1045  * Application config hooks to set various driver parameters.
1046  */
1047
1048 static const struct config_table debug_tab[] = {
1049             { "PKT.DEBUG",       ARG_ATOI,   &pcap_pkt_debug    },
1050             { "PKT.VECTOR",      ARG_ATOX_W, NULL               },
1051             { "NDIS.DEBUG",      ARG_ATOI,   NULL               },
1052 #ifdef USE_32BIT_DRIVERS
1053             { "3C503.DEBUG",     ARG_ATOI,   &ei_debug          },
1054             { "3C503.IO_BASE",   ARG_ATOX_W, &el2_dev.base_addr },
1055             { "3C503.MEMORY",    ARG_ATOX_W, &el2_dev.mem_start },
1056             { "3C503.IRQ",       ARG_ATOI,   &el2_dev.irq       },
1057             { "3C505.DEBUG",     ARG_ATOI,   NULL               },
1058             { "3C505.BASE",      ARG_ATOX_W, NULL               },
1059             { "3C507.DEBUG",     ARG_ATOI,   NULL               },
1060             { "3C509.DEBUG",     ARG_ATOI,   &el3_debug         },
1061             { "3C509.ILOOP",     ARG_ATOI,   &el3_max_loop      },
1062             { "3C529.DEBUG",     ARG_ATOI,   NULL               },
1063             { "3C575.DEBUG",     ARG_ATOI,   &debug_3c575       },
1064             { "3C59X.DEBUG",     ARG_ATOI,   &vortex_debug      },
1065             { "3C59X.IFACE0",    ARG_ATOI,   &vortex_options[0] },
1066             { "3C59X.IFACE1",    ARG_ATOI,   &vortex_options[1] },
1067             { "3C59X.IFACE2",    ARG_ATOI,   &vortex_options[2] },
1068             { "3C59X.IFACE3",    ARG_ATOI,   &vortex_options[3] },
1069             { "3C90X.DEBUG",     ARG_ATOX_W, &tc90xbc_debug     },
1070             { "ACCT.DEBUG",      ARG_ATOI,   &ethpk_debug       },
1071             { "CS89.DEBUG",      ARG_ATOI,   &cs89_debug        },
1072             { "RTL8139.DEBUG",   ARG_ATOI,   &rtl8139_debug     },
1073         /*  { "RTL8139.FDUPLEX", ARG_ATOI,   &rtl8139_options   }, */
1074             { "SMC.DEBUG",       ARG_ATOI,   &ei_debug          },
1075         /*  { "E100.DEBUG",      ARG_ATOI,   &e100_debug        }, */
1076             { "PCI.DEBUG",       ARG_ATOI,   &pci_debug         },
1077             { "BIOS32.DEBUG",    ARG_ATOI,   &bios32_debug      },
1078             { "IRQ.DEBUG",       ARG_ATOI,   &irq_debug         },
1079             { "TIMER.IRQ",       ARG_ATOI,   &timer_irq         },
1080 #endif
1081             { NULL }
1082           };
1083
1084 /*
1085  * pcap_config_hook() is an extension to application's config
1086  * handling. Uses Watt-32's config-table function.
1087  */
1088 int pcap_config_hook (const char *keyword, const char *value)
1089 {
1090   return parse_config_table (debug_tab, NULL, keyword, value);
1091 }
1092
1093 /*
1094  * Linked list of supported devices
1095  */
1096 struct device       *active_dev = NULL;      /* the device we have opened */
1097 struct device       *probed_dev = NULL;      /* the device we have probed */
1098 const struct device *dev_base   = &pkt_dev;  /* list of network devices */
1099
1100 /*
1101  * PKTDRVR device functions
1102  */
1103 int pcap_pkt_debug = -1;
1104
1105 static void pkt_close (struct device *dev)
1106 {
1107   BOOL okay = PktExitDriver();
1108
1109   if (pcap_pkt_debug > 1)
1110      fprintf (stderr, "pkt_close(): %d\n", okay);
1111
1112   if (dev->priv)
1113      free (dev->priv);
1114   dev->priv = NULL;
1115 }
1116
1117 static int pkt_open (struct device *dev)
1118 {
1119   PKT_RX_MODE mode;
1120
1121   if (dev->flags & IFF_PROMISC)
1122        mode = PDRX_ALL_PACKETS;
1123   else mode = PDRX_BROADCAST;
1124
1125   if (!PktInitDriver(mode))
1126      return (0);
1127
1128   PktResetStatistics (pktInfo.handle);
1129   PktQueueBusy (FALSE);
1130   return (1);
1131 }
1132
1133 static int pkt_xmit (struct device *dev, const void *buf, int len)
1134 {
1135   struct net_device_stats *stats = (struct net_device_stats*) dev->priv;
1136
1137   if (pcap_pkt_debug > 0)
1138      dbug_write ("pcap_xmit\n");
1139
1140   if (!PktTransmit(buf,len))
1141   {
1142     stats->tx_errors++;
1143     return (0);
1144   }
1145   return (len);
1146 }
1147
1148 static void *pkt_stats (struct device *dev)
1149 {
1150   struct net_device_stats *stats = (struct net_device_stats*) dev->priv;
1151
1152   if (!stats || !PktSessStatistics(pktInfo.handle))
1153      return (NULL);
1154
1155   stats->rx_packets       = pktStat.inPackets;
1156   stats->rx_errors        = pktStat.lost;
1157   stats->rx_missed_errors = PktRxDropped();
1158   return (stats);
1159 }
1160
1161 static int pkt_probe (struct device *dev)
1162 {
1163   if (!PktSearchDriver())
1164      return (0);
1165
1166   dev->open           = pkt_open;
1167   dev->xmit           = pkt_xmit;
1168   dev->close          = pkt_close;
1169   dev->get_stats      = pkt_stats;
1170   dev->copy_rx_buf    = PktReceive;  /* farmem peek and copy routine */
1171   dev->get_rx_buf     = NULL;
1172   dev->peek_rx_buf    = NULL;
1173   dev->release_rx_buf = NULL;
1174   dev->priv           = calloc (sizeof(struct net_device_stats), 1);
1175   if (!dev->priv)
1176      return (0);
1177   return (1);
1178 }
1179
1180 /*
1181  * NDIS device functions
1182  */
1183 static void ndis_close (struct device *dev)
1184 {
1185 #ifdef USE_NDIS2
1186   NdisShutdown();
1187 #endif
1188   ARGSUSED (dev);
1189 }
1190
1191 static int ndis_open (struct device *dev)
1192 {
1193   int promis = (dev->flags & IFF_PROMISC);
1194
1195 #ifdef USE_NDIS2
1196   if (!NdisInit(promis))
1197      return (0);
1198   return (1);
1199 #else
1200   ARGSUSED (promis);
1201   return (0);
1202 #endif
1203 }
1204
1205 static void *ndis_stats (struct device *dev)
1206 {
1207   static struct net_device_stats stats;
1208
1209   /* to-do */
1210   ARGSUSED (dev);
1211   return (&stats);
1212 }
1213
1214 static int ndis_probe (struct device *dev)
1215 {
1216 #ifdef USE_NDIS2
1217   if (!NdisOpen())
1218      return (0);
1219 #endif
1220
1221   dev->open           = ndis_open;
1222   dev->xmit           = NULL;
1223   dev->close          = ndis_close;
1224   dev->get_stats      = ndis_stats;
1225   dev->copy_rx_buf    = NULL;       /* to-do */
1226   dev->get_rx_buf     = NULL;       /* upcall is from rmode driver */
1227   dev->peek_rx_buf    = NULL;
1228   dev->release_rx_buf = NULL;
1229   return (0);
1230 }
1231
1232 /*
1233  * Search & probe for supported 32-bit (pmode) pcap devices
1234  */
1235 #if defined(USE_32BIT_DRIVERS)
1236
1237 struct device el2_dev LOCKED_VAR = {
1238               "3c503",
1239               "EtherLink II",
1240               0,
1241               0,0,0,0,0,0,
1242               NULL,
1243               el2_probe
1244             };
1245
1246 struct device el3_dev LOCKED_VAR = {
1247               "3c509",
1248               "EtherLink III",
1249               0,
1250               0,0,0,0,0,0,
1251               &el2_dev,
1252               el3_probe
1253             };
1254
1255 struct device tc515_dev LOCKED_VAR = {
1256               "3c515",
1257               "EtherLink PCI",
1258               0,
1259               0,0,0,0,0,0,
1260               &el3_dev,
1261               tc515_probe
1262             };
1263
1264 struct device tc59_dev LOCKED_VAR = {
1265               "3c59x",
1266               "EtherLink PCI",
1267               0,
1268               0,0,0,0,0,0,
1269               &tc515_dev,
1270               tc59x_probe
1271             };
1272
1273 struct device tc90xbc_dev LOCKED_VAR = {
1274               "3c90x",
1275               "EtherLink 90X",
1276               0,
1277               0,0,0,0,0,0,
1278               &tc59_dev,
1279               tc90xbc_probe
1280             };
1281
1282 struct device wd_dev LOCKED_VAR = {
1283               "wd",
1284               "Westen Digital",
1285               0,
1286               0,0,0,0,0,0,
1287               &tc90xbc_dev,
1288               wd_probe
1289             };
1290
1291 struct device ne_dev LOCKED_VAR = {
1292               "ne",
1293               "NEx000",
1294               0,
1295               0,0,0,0,0,0,
1296               &wd_dev,
1297               ne_probe
1298             };
1299
1300 struct device acct_dev LOCKED_VAR = {
1301               "acct",
1302               "Accton EtherPocket",
1303               0,
1304               0,0,0,0,0,0,
1305               &ne_dev,
1306               ethpk_probe
1307             };
1308
1309 struct device cs89_dev LOCKED_VAR = {
1310               "cs89",
1311               "Crystal Semiconductor",
1312               0,
1313               0,0,0,0,0,0,
1314               &acct_dev,
1315               cs89x0_probe
1316             };
1317
1318 struct device rtl8139_dev LOCKED_VAR = {
1319               "rtl8139",
1320               "RealTek PCI",
1321               0,
1322               0,0,0,0,0,0,
1323               &cs89_dev,
1324               rtl8139_probe     /* dev->probe routine */
1325             };
1326
1327 /*
1328  * Dequeue routine is called by polling.
1329  * NOTE: the queue-element is not copied, only a pointer is
1330  * returned at '*buf'
1331  */
1332 int peek_rxbuf (BYTE **buf)
1333 {
1334   struct rx_elem *tail, *head;
1335
1336   PCAP_ASSERT (pktq_check (&active_dev->queue));
1337
1338   DISABLE();
1339   tail = pktq_out_elem (&active_dev->queue);
1340   head = pktq_in_elem (&active_dev->queue);
1341   ENABLE();
1342
1343   if (head != tail)
1344   {
1345     PCAP_ASSERT (tail->size < active_dev->queue.elem_size-4-2);
1346
1347     *buf = &tail->data[0];
1348     return (tail->size);
1349   }
1350   *buf = NULL;
1351   return (0);
1352 }
1353
1354 /*
1355  * Release buffer we peeked at above.
1356  */
1357 int release_rxbuf (BYTE *buf)
1358 {
1359 #ifndef NDEBUG
1360   struct rx_elem *tail = pktq_out_elem (&active_dev->queue);
1361
1362   PCAP_ASSERT (&tail->data[0] == buf);
1363 #else
1364   ARGSUSED (buf);
1365 #endif
1366   pktq_inc_out (&active_dev->queue);
1367   return (1);
1368 }
1369
1370 /*
1371  * get_rxbuf() routine (in locked code) is called from IRQ handler
1372  * to request a buffer. Interrupts are disabled and we have a 32kB stack.
1373  */
1374 BYTE *get_rxbuf (int len)
1375 {
1376   int idx;
1377
1378   if (len < ETH_MIN || len > ETH_MAX)
1379      return (NULL);
1380
1381   idx = pktq_in_index (&active_dev->queue);
1382
1383 #ifdef DEBUG
1384   {
1385     static int fan_idx LOCKED_VAR = 0;
1386     writew ("-\\|/"[fan_idx++] | (15 << 8),      /* white on black colour */
1387             0xB8000 + 2*79);  /* upper-right corner, 80-col colour screen */
1388     fan_idx &= 3;
1389   }
1390 /* writew (idx + '0' + 0x0F00, 0xB8000 + 2*78); */
1391 #endif
1392
1393   if (idx != active_dev->queue.out_index)
1394   {
1395     struct rx_elem *head = pktq_in_elem (&active_dev->queue);
1396
1397     head->size = len;
1398     active_dev->queue.in_index = idx;
1399     return (&head->data[0]);
1400   }
1401
1402   /* !!to-do: drop 25% of the oldest element
1403    */
1404   pktq_clear (&active_dev->queue);
1405   return (NULL);
1406 }
1407
1408 /*
1409  *  Simple ring-buffer queue handler for reception of packets
1410  *  from network driver.
1411  */
1412 #define PKTQ_MARKER  0xDEADBEEF
1413
1414 static int pktq_check (struct rx_ringbuf *q)
1415 {
1416 #ifndef NDEBUG
1417   int   i;
1418   char *buf;
1419 #endif
1420
1421   if (!q || !q->num_elem || !q->buf_start)
1422      return (0);
1423
1424 #ifndef NDEBUG
1425   buf = q->buf_start;
1426
1427   for (i = 0; i < q->num_elem; i++)
1428   {
1429     buf += q->elem_size;
1430     if (*(DWORD*)(buf - sizeof(DWORD)) != PKTQ_MARKER)
1431        return (0);
1432   }
1433 #endif
1434   return (1);
1435 }
1436
1437 static int pktq_init (struct rx_ringbuf *q, int size, int num, char *pool)
1438 {
1439   int i;
1440
1441   q->elem_size = size;
1442   q->num_elem  = num;
1443   q->buf_start = pool;
1444   q->in_index  = 0;
1445   q->out_index = 0;
1446
1447   PCAP_ASSERT (size >= sizeof(struct rx_elem) + sizeof(DWORD));
1448   PCAP_ASSERT (num);
1449   PCAP_ASSERT (pool);
1450
1451   for (i = 0; i < num; i++)
1452   {
1453 #if 0
1454     struct rx_elem *elem = (struct rx_elem*) pool;
1455
1456     /* assert dword aligned elements
1457      */
1458     PCAP_ASSERT (((unsigned)(&elem->data[0]) & 3) == 0);
1459 #endif
1460     pool += size;
1461     *(DWORD*) (pool - sizeof(DWORD)) = PKTQ_MARKER;
1462   }
1463   return (1);
1464 }
1465
1466 /*
1467  * Increment the queue 'out_index' (tail).
1468  * Check for wraps.
1469  */
1470 static int pktq_inc_out (struct rx_ringbuf *q)
1471 {
1472   q->out_index++;
1473   if (q->out_index >= q->num_elem)
1474       q->out_index = 0;
1475   return (q->out_index);
1476 }
1477
1478 /*
1479  * Return the queue's next 'in_index' (head).
1480  * Check for wraps.
1481  */
1482 static int pktq_in_index (struct rx_ringbuf *q)
1483 {
1484   volatile int index = q->in_index + 1;
1485
1486   if (index >= q->num_elem)
1487       index = 0;
1488   return (index);
1489 }
1490
1491 /*
1492  * Return the queue's head-buffer.
1493  */
1494 static struct rx_elem *pktq_in_elem (struct rx_ringbuf *q)
1495 {
1496   return (struct rx_elem*) (q->buf_start + (q->elem_size * q->in_index));
1497 }
1498
1499 /*
1500  * Return the queue's tail-buffer.
1501  */
1502 static struct rx_elem *pktq_out_elem (struct rx_ringbuf *q)
1503 {
1504   return (struct rx_elem*) (q->buf_start + (q->elem_size * q->out_index));
1505 }
1506
1507 /*
1508  * Clear the queue ring-buffer by setting head=tail.
1509  */
1510 static void pktq_clear (struct rx_ringbuf *q)
1511 {
1512   q->in_index = q->out_index;
1513 }
1514
1515 /*
1516  * Symbols that must be linkable for "gcc -O0"
1517  */
1518 #undef __IOPORT_H
1519 #undef __DMA_H
1520
1521 #define extern
1522 #define __inline__
1523
1524 #include "msdos/pm_drvr/ioport.h"
1525 #include "msdos/pm_drvr/dma.h"
1526
1527 #endif /* USE_32BIT_DRIVERS */
1528
1529 /*
1530  * Libpcap version string.
1531  */
1532 const char *
1533 pcap_lib_version(void)
1534 {
1535   return ("DOS-" PCAP_VERSION_STRING);
1536 }