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

   1 /*
   2  * Copyright (c) 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * This code contributed by Sagun Shakya (sagun.shakya@sun.com)
  22  */
  23 /*
  24  * Packet capture routines for DLPI using libdlpi under SunOS 5.11.
  25  */
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include <config.h>
  29 #endif
  30
  31 #include <sys/types.h>
  32 #include <sys/time.h>
  33 #include <sys/bufmod.h>
  34 #include <sys/stream.h>
  35 #include <libdlpi.h>
  36 #include <errno.h>
  37 #include <memory.h>
  38 #include <stropts.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42
  43 #include "pcap-int.h"
  44 #include "dlpisubs.h"
  45
  46 /* Forwards. */
  47 static int dlpromiscon(pcap_t *, bpf_u_int32);
  48 static int pcap_read_libdlpi(pcap_t *, int, pcap_handler, u_char *);
  49 static int pcap_inject_libdlpi(pcap_t *, const void *, int);
  50 static void pcap_libdlpi_err(const char *, const char *, int, char *);
  51 static void pcap_cleanup_libdlpi(pcap_t *);
  52
  53 /*
  54  * list_interfaces() will list all the network links that are
  55  * available on a system.
  56  */
  57 static boolean_t list_interfaces(const char *, void *);
  58
  59 typedef struct linknamelist {
  60         char    linkname[DLPI_LINKNAME_MAX];
  61         struct linknamelist *lnl_next;
  62 } linknamelist_t;
  63
  64 typedef struct linkwalk {
  65         linknamelist_t  *lw_list;
  66         int             lw_err;
  67 } linkwalk_t;
  68
  69 /*
  70  * The caller of this function should free the memory allocated
  71  * for each linknamelist_t "entry" allocated.
  72  */
  73 static boolean_t
  74 list_interfaces(const char *linkname, void *arg)
  75 {
  76         linkwalk_t      *lwp = arg;
  77         linknamelist_t  *entry;
  78
  79         if ((entry = calloc(1, sizeof(linknamelist_t))) == NULL) {
  80                 lwp->lw_err = ENOMEM;
  81                 return (B_TRUE);
  82         }
  83         (void) pcap_strlcpy(entry->linkname, linkname, DLPI_LINKNAME_MAX);
  84
  85         if (lwp->lw_list == NULL) {
  86                 lwp->lw_list = entry;
  87         } else {
  88                 entry->lnl_next = lwp->lw_list;
  89                 lwp->lw_list = entry;
  90         }
  91
  92         return (B_FALSE);
  93 }
  94
  95 static int
  96 pcap_activate_libdlpi(pcap_t *p)
  97 {
  98         struct pcap_dlpi *pd = p->priv;
  99         int status = 0;
 100         int retv;
 101         dlpi_handle_t dh;
 102         dlpi_info_t dlinfo;
 103
 104         /*
 105          * Enable Solaris raw and passive DLPI extensions;
 106          * dlpi_open() will not fail if the underlying link does not support
 107          * passive mode. See dlpi(7P) for details.
 108          */
 109         retv = dlpi_open(p->opt.device, &dh, DLPI_RAW|DLPI_PASSIVE);
 110         if (retv != DLPI_SUCCESS) {
 111                 if (retv == DLPI_ELINKNAMEINVAL || retv == DLPI_ENOLINK)
 112                         status = PCAP_ERROR_NO_SUCH_DEVICE;
 113                 else if (retv == DL_SYSERR &&
 114                     (errno == EPERM || errno == EACCES))
 115                         status = PCAP_ERROR_PERM_DENIED;
 116                 else
 117                         status = PCAP_ERROR;
 118                 pcap_libdlpi_err(p->opt.device, "dlpi_open", retv,
 119                     p->errbuf);
 120                 return (status);
 121         }
 122         pd->dlpi_hd = dh;
 123
 124         if (p->opt.rfmon) {
 125                 /*
 126                  * This device exists, but we don't support monitor mode
 127                  * any platforms that support DLPI.
 128                  */
 129                 status = PCAP_ERROR_RFMON_NOTSUP;
 130                 goto bad;
 131         }
 132
 133         /* Bind with DLPI_ANY_SAP. */
 134         if ((retv = dlpi_bind(pd->dlpi_hd, DLPI_ANY_SAP, 0)) != DLPI_SUCCESS) {
 135                 status = PCAP_ERROR;
 136                 pcap_libdlpi_err(p->opt.device, "dlpi_bind", retv, p->errbuf);
 137                 goto bad;
 138         }
 139
 140         /*
 141          * Turn a negative snapshot value (invalid), a snapshot value of
 142          * 0 (unspecified), or a value bigger than the normal maximum
 143          * value, into the maximum allowed value.
 144          *
 145          * If some application really *needs* a bigger snapshot
 146          * length, we should just increase MAXIMUM_SNAPLEN.
 147          */
 148         if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
 149                 p->snapshot = MAXIMUM_SNAPLEN;
 150
 151         /* Enable promiscuous mode. */
 152         if (p->opt.promisc) {
 153                 retv = dlpromiscon(p, DL_PROMISC_PHYS);
 154                 if (retv < 0) {
 155                         /*
 156                          * "You don't have permission to capture on
 157                          * this device" and "you don't have permission
 158                          * to capture in promiscuous mode on this
 159                          * device" are different; let the user know,
 160                          * so if they can't get permission to
 161                          * capture in promiscuous mode, they can at
 162                          * least try to capture in non-promiscuous
 163                          * mode.
 164                          *
 165                          * XXX - you might have to capture in
 166                          * promiscuous mode to see outgoing packets.
 167                          */
 168                         if (retv == PCAP_ERROR_PERM_DENIED)
 169                                 status = PCAP_ERROR_PROMISC_PERM_DENIED;
 170                         else
 171                                 status = retv;
 172                         goto bad;
 173                 }
 174         } else {
 175                 /* Try to enable multicast. */
 176                 retv = dlpromiscon(p, DL_PROMISC_MULTI);
 177                 if (retv < 0) {
 178                         status = retv;
 179                         goto bad;
 180                 }
 181         }
 182
 183         /* Try to enable SAP promiscuity. */
 184         retv = dlpromiscon(p, DL_PROMISC_SAP);
 185         if (retv < 0) {
 186                 /*
 187                  * Not fatal, since the DL_PROMISC_PHYS mode worked.
 188                  * Report it as a warning, however.
 189                  */
 190                 if (p->opt.promisc)
 191                         status = PCAP_WARNING;
 192                 else {
 193                         status = retv;
 194                         goto bad;
 195                 }
 196         }
 197
 198         /* Determine link type.  */
 199         if ((retv = dlpi_info(pd->dlpi_hd, &dlinfo, 0)) != DLPI_SUCCESS) {
 200                 status = PCAP_ERROR;
 201                 pcap_libdlpi_err(p->opt.device, "dlpi_info", retv, p->errbuf);
 202                 goto bad;
 203         }
 204
 205         if (pcap_process_mactype(p, dlinfo.di_mactype) != 0) {
 206                 status = PCAP_ERROR;
 207                 goto bad;
 208         }
 209
 210         p->fd = dlpi_fd(pd->dlpi_hd);
 211
 212         /* Push and configure bufmod. */
 213         if (pcap_conf_bufmod(p, p->snapshot) != 0) {
 214                 status = PCAP_ERROR;
 215                 goto bad;
 216         }
 217
 218         /*
 219          * Flush the read side.
 220          */
 221         if (ioctl(p->fd, I_FLUSH, FLUSHR) != 0) {
 222                 status = PCAP_ERROR;
 223                 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
 224                     errno, "FLUSHR");
 225                 goto bad;
 226         }
 227
 228         /* Allocate data buffer. */
 229         if (pcap_alloc_databuf(p) != 0) {
 230                 status = PCAP_ERROR;
 231                 goto bad;
 232         }
 233
 234         /*
 235          * "p->fd" is a FD for a STREAMS device, so "select()" and
 236          * "poll()" should work on it.
 237          */
 238         p->selectable_fd = p->fd;
 239
 240         p->read_op = pcap_read_libdlpi;
 241         p->inject_op = pcap_inject_libdlpi;
 242         p->setfilter_op = install_bpf_program;  /* No kernel filtering */
 243         p->setdirection_op = NULL;      /* Not implemented */
 244         p->set_datalink_op = NULL;      /* Can't change data link type */
 245         p->getnonblock_op = pcap_getnonblock_fd;
 246         p->setnonblock_op = pcap_setnonblock_fd;
 247         p->stats_op = pcap_stats_dlpi;
 248         p->cleanup_op = pcap_cleanup_libdlpi;
 249
 250         return (status);
 251 bad:
 252         pcap_cleanup_libdlpi(p);
 253         return (status);
 254 }
 255
 256 #define STRINGIFY(n)    #n
 257
 258 static int
 259 dlpromiscon(pcap_t *p, bpf_u_int32 level)
 260 {
 261         struct pcap_dlpi *pd = p->priv;
 262         int retv;
 263         int err;
 264
 265         retv = dlpi_promiscon(pd->dlpi_hd, level);
 266         if (retv != DLPI_SUCCESS) {
 267                 if (retv == DL_SYSERR &&
 268                     (errno == EPERM || errno == EACCES))
 269                         err = PCAP_ERROR_PERM_DENIED;
 270                 else
 271                         err = PCAP_ERROR;
 272                 pcap_libdlpi_err(p->opt.device, "dlpi_promiscon" STRINGIFY(level),
 273                     retv, p->errbuf);
 274                 return (err);
 275         }
 276         return (0);
 277 }
 278
 279 /*
 280  * Presumably everything returned by dlpi_walk() is a DLPI device,
 281  * so there's no work to be done here to check whether name refers
 282  * to a DLPI device.
 283  */
 284 static int
 285 is_dlpi_interface(const char *name _U_)
 286 {
 287         return (1);
 288 }
 289
 290 static int
 291 get_if_flags(const char *name _U_, bpf_u_int32 *flags _U_, char *errbuf _U_)
 292 {
 293         /*
 294          * Nothing we can do other than mark loopback devices as "the
 295          * connected/disconnected status doesn't apply".
 296          *
 297          * XXX - on Solaris, can we do what the dladm command does,
 298          * i.e. get a connected/disconnected indication from a kstat?
 299          * (Note that you can also get the link speed, and possibly
 300          * other information, from a kstat as well.)
 301          */
 302         if (*flags & PCAP_IF_LOOPBACK) {
 303                 /*
 304                  * Loopback devices aren't wireless, and "connected"/
 305                  * "disconnected" doesn't apply to them.
 306                  */
 307                 *flags |= PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE;
 308                 return (0);
 309         }
 310         return (0);
 311 }
 312
 313 /*
 314  * In Solaris, the "standard" mechanism" i.e SIOCGLIFCONF will only find
 315  * network links that are plumbed and are up. dlpi_walk(3DLPI) will find
 316  * additional network links present in the system.
 317  */
 318 int
 319 pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf)
 320 {
 321         int retv = 0;
 322
 323         linknamelist_t  *entry, *next;
 324         linkwalk_t      lw = {NULL, 0};
 325         int             save_errno;
 326
 327         /*
 328          * Get the list of regular interfaces first.
 329          */
 330         if (pcap_findalldevs_interfaces(devlistp, errbuf,
 331             is_dlpi_interface, get_if_flags) == -1)
 332                 return (-1);    /* failure */
 333
 334         /* dlpi_walk() for loopback will be added here. */
 335
 336         /*
 337          * Find all DLPI devices in the current zone.
 338          *
 339          * XXX - will pcap_findalldevs_interfaces() find any devices
 340          * outside the current zone?  If not, the only reason to call
 341          * it would be to get the interface addresses.
 342          */
 343         dlpi_walk(list_interfaces, &lw, 0);
 344
 345         if (lw.lw_err != 0) {
 346                 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
 347                     lw.lw_err, "dlpi_walk");
 348                 retv = -1;
 349                 goto done;
 350         }
 351
 352         /* Add linkname if it does not exist on the list. */
 353         for (entry = lw.lw_list; entry != NULL; entry = entry->lnl_next) {
 354                 /*
 355                  * If it isn't already in the list of devices, try to
 356                  * add it.
 357                  */
 358                 if (find_or_add_dev(devlistp, entry->linkname, 0, get_if_flags,
 359                     NULL, errbuf) == NULL)
 360                         retv = -1;
 361         }
 362 done:
 363         save_errno = errno;
 364         for (entry = lw.lw_list; entry != NULL; entry = next) {
 365                 next = entry->lnl_next;
 366                 free(entry);
 367         }
 368         errno = save_errno;
 369
 370         return (retv);
 371 }
 372
 373 /*
 374  * Read data received on DLPI handle. Returns -2 if told to terminate, else
 375  * returns the number of packets read.
 376  */
 377 static int
 378 pcap_read_libdlpi(pcap_t *p, int count, pcap_handler callback, u_char *user)
 379 {
 380         struct pcap_dlpi *pd = p->priv;
 381         int len;
 382         u_char *bufp;
 383         size_t msglen;
 384         int retv;
 385
 386         len = p->cc;
 387         if (len != 0) {
 388                 bufp = p->bp;
 389                 goto process_pkts;
 390         }
 391         do {
 392                 /* Has "pcap_breakloop()" been called? */
 393                 if (p->break_loop) {
 394                         /*
 395                          * Yes - clear the flag that indicates that it has,
 396                          * and return -2 to indicate that we were told to
 397                          * break out of the loop.
 398                          */
 399                         p->break_loop = 0;
 400                         return (-2);
 401                 }
 402
 403                 msglen = p->bufsize;
 404                 bufp = (u_char *)p->buffer + p->offset;
 405
 406                 retv = dlpi_recv(pd->dlpi_hd, NULL, NULL, bufp,
 407                     &msglen, -1, NULL);
 408                 if (retv != DLPI_SUCCESS) {
 409                         /*
 410                          * This is most likely a call to terminate out of the
 411                          * loop. So, do not return an error message, instead
 412                          * check if "pcap_breakloop()" has been called above.
 413                          */
 414                         if (retv == DL_SYSERR && errno == EINTR) {
 415                                 len = 0;
 416                                 continue;
 417                         }
 418                         pcap_libdlpi_err(dlpi_linkname(pd->dlpi_hd),
 419                             "dlpi_recv", retv, p->errbuf);
 420                         return (-1);
 421                 }
 422                 len = msglen;
 423         } while (len == 0);
 424
 425 process_pkts:
 426         return (pcap_process_pkts(p, callback, user, count, bufp, len));
 427 }
 428
 429 static int
 430 pcap_inject_libdlpi(pcap_t *p, const void *buf, int size)
 431 {
 432         struct pcap_dlpi *pd = p->priv;
 433         int retv;
 434
 435         retv = dlpi_send(pd->dlpi_hd, NULL, 0, buf, size, NULL);
 436         if (retv != DLPI_SUCCESS) {
 437                 pcap_libdlpi_err(dlpi_linkname(pd->dlpi_hd), "dlpi_send", retv,
 438                     p->errbuf);
 439                 return (-1);
 440         }
 441         /*
 442          * dlpi_send(3DLPI) does not provide a way to return the number of
 443          * bytes sent on the wire. Based on the fact that DLPI_SUCCESS was
 444          * returned we are assuming 'size' bytes were sent.
 445          */
 446         return (size);
 447 }
 448
 449 /*
 450  * Close dlpi handle.
 451  */
 452 static void
 453 pcap_cleanup_libdlpi(pcap_t *p)
 454 {
 455         struct pcap_dlpi *pd = p->priv;
 456
 457         if (pd->dlpi_hd != NULL) {
 458                 dlpi_close(pd->dlpi_hd);
 459                 pd->dlpi_hd = NULL;
 460                 p->fd = -1;
 461         }
 462         pcap_cleanup_live_common(p);
 463 }
 464
 465 /*
 466  * Write error message to buffer.
 467  */
 468 static void
 469 pcap_libdlpi_err(const char *linkname, const char *func, int err, char *errbuf)
 470 {
 471         pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "libpcap: %s failed on %s: %s",
 472             func, linkname, dlpi_strerror(err));
 473 }
 474
 475 pcap_t *
 476 pcap_create_interface(const char *device _U_, char *ebuf)
 477 {
 478         pcap_t *p;
 479
 480         p = pcap_create_common(ebuf, sizeof (struct pcap_dlpi));
 481         if (p == NULL)
 482                 return (NULL);
 483
 484         p->activate_op = pcap_activate_libdlpi;
 485         return (p);
 486 }
 487
 488 /*
 489  * Libpcap version string.
 490  */
 491 const char *
 492 pcap_lib_version(void)
 493 {
 494         return (PCAP_VERSION_STRING);
 495 }