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 #ifndef lint
  28 static const char rcsid[] _U_ =
  29         "@(#) $Header: /tcpdump/master/libpcap/pcap-libdlpi.c,v 1.6 2008-04-14 20:40:58 guy Exp $ (LBL)";
  30 #endif
  31
  32 #ifdef HAVE_CONFIG_H
  33 #include "config.h"
  34 #endif
  35
  36 #include <sys/types.h>
  37 #include <sys/time.h>
  38 #include <sys/bufmod.h>
  39 #include <sys/stream.h>
  40 #include <libdlpi.h>
  41 #include <errno.h>
  42 #include <memory.h>
  43 #include <stropts.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47
  48 #include "pcap-int.h"
  49 #include "dlpisubs.h"
  50
  51 /* Forwards. */
  52 static int dlpromiscon(pcap_t *, bpf_u_int32);
  53 static int pcap_read_libdlpi(pcap_t *, int, pcap_handler, u_char *);
  54 static int pcap_inject_libdlpi(pcap_t *, const void *, size_t);
  55 static void pcap_libdlpi_err(const char *, const char *, int, char *);
  56 static void pcap_cleanup_libdlpi(pcap_t *);
  57
  58 /*
  59  * list_interfaces() will list all the network links that are
  60  * available on a system.
  61  */
  62 static boolean_t list_interfaces(const char *, void *);
  63
  64 typedef struct linknamelist {
  65         char    linkname[DLPI_LINKNAME_MAX];
  66         struct linknamelist *lnl_next;
  67 } linknamelist_t;
  68
  69 typedef struct linkwalk {
  70         linknamelist_t  *lw_list;
  71         int             lw_err;
  72 } linkwalk_t;
  73
  74 /*
  75  * The caller of this function should free the memory allocated
  76  * for each linknamelist_t "entry" allocated.
  77  */
  78 static boolean_t
  79 list_interfaces(const char *linkname, void *arg)
  80 {
  81         linkwalk_t      *lwp = arg;
  82         linknamelist_t  *entry;
  83
  84         if ((entry = calloc(1, sizeof(linknamelist_t))) == NULL) {
  85                 lwp->lw_err = ENOMEM;
  86                 return (B_TRUE);
  87         }
  88         (void) strlcpy(entry->linkname, linkname, DLPI_LINKNAME_MAX);
  89
  90         if (lwp->lw_list == NULL) {
  91                 lwp->lw_list = entry;
  92         } else {
  93                 entry->lnl_next = lwp->lw_list;
  94                 lwp->lw_list = entry;
  95         }
  96
  97         return (B_FALSE);
  98 }
  99
 100 static int
 101 pcap_activate_libdlpi(pcap_t *p)
 102 {
 103         int retv;
 104         dlpi_handle_t dh;
 105         dlpi_info_t dlinfo;
 106         int err = PCAP_ERROR;
 107
 108         /*
 109          * Enable Solaris raw and passive DLPI extensions;
 110          * dlpi_open() will not fail if the underlying link does not support
 111          * passive mode. See dlpi(7P) for details.
 112          */
 113         retv = dlpi_open(p->opt.source, &dh, DLPI_RAW|DLPI_PASSIVE);
 114         if (retv != DLPI_SUCCESS) {
 115                 if (retv == DLPI_ELINKNAMEINVAL || retv == DLPI_ENOLINK)
 116                         err = PCAP_ERROR_NO_SUCH_DEVICE;
 117                 else if (retv == DL_SYSERR &&
 118                     (errno == EPERM || errno == EACCES))
 119                         err = PCAP_ERROR_PERM_DENIED;
 120                 pcap_libdlpi_err(p->opt.source, "dlpi_open", retv,
 121                     p->errbuf);
 122                 return (err);
 123         }
 124         p->dlpi_hd = dh;
 125
 126         if (p->opt.rfmon) {
 127                 /*
 128                  * This device exists, but we don't support monitor mode
 129                  * any platforms that support DLPI.
 130                  */
 131                 err = PCAP_ERROR_RFMON_NOTSUP;
 132                 goto bad;
 133         }
 134
 135         /* Bind with DLPI_ANY_SAP. */
 136         if ((retv = dlpi_bind(p->dlpi_hd, DLPI_ANY_SAP, 0)) != DLPI_SUCCESS) {
 137                 pcap_libdlpi_err(p->opt.source, "dlpi_bind", retv, p->errbuf);
 138                 goto bad;
 139         }
 140
 141         /* Enable promiscuous mode. */
 142         if (p->opt.promisc) {
 143                 err = dlpromiscon(p, DL_PROMISC_PHYS);
 144                 if (err < 0) {
 145                         /*
 146                          * "You don't have permission to capture on
 147                          * this device" and "you don't have permission
 148                          * to capture in promiscuous mode on this
 149                          * device" are different; let the user know,
 150                          * so if they can't get permission to
 151                          * capture in promiscuous mode, they can at
 152                          * least try to capture in non-promiscuous
 153                          * mode.
 154                          *
 155                          * XXX - you might have to capture in
 156                          * promiscuous mode to see outgoing packets.
 157                          */
 158                         if (err == PCAP_ERROR_PERM_DENIED)
 159                                 err = PCAP_ERROR_PROMISC_PERM_DENIED;
 160                         goto bad;
 161                 }
 162         } else {
 163                 /* Try to enable multicast. */
 164                 err = dlpromiscon(p, DL_PROMISC_MULTI);
 165                 if (err < 0)
 166                         goto bad;
 167         }
 168
 169         /* Try to enable SAP promiscuity. */
 170         err = dlpromiscon(p, DL_PROMISC_SAP);
 171         if (err < 0) {
 172                 /*
 173                  * Not fatal, since the DL_PROMISC_PHYS mode worked.
 174                  * Report it as a warning, however.
 175                  */
 176                 if (p->opt.promisc)
 177                         err = PCAP_WARNING;
 178                 else
 179                         goto bad;
 180         }
 181
 182         /* Determine link type.  */
 183         if ((retv = dlpi_info(p->dlpi_hd, &dlinfo, 0)) != DLPI_SUCCESS) {
 184                 pcap_libdlpi_err(p->opt.source, "dlpi_info", retv, p->errbuf);
 185                 goto bad;
 186         }
 187
 188         if (pcap_process_mactype(p, dlinfo.di_mactype) != 0)
 189                 goto bad;
 190
 191         p->fd = dlpi_fd(p->dlpi_hd);
 192
 193         /* Push and configure bufmod. */
 194         if (pcap_conf_bufmod(p, p->snapshot, p->md.timeout) != 0)
 195                 goto bad;
 196
 197         /*
 198          * Flush the read side.
 199          */
 200         if (ioctl(p->fd, I_FLUSH, FLUSHR) != 0) {
 201                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "FLUSHR: %s",
 202                     pcap_strerror(errno));
 203                 goto bad;
 204         }
 205
 206         /* Allocate data buffer. */
 207         if (pcap_alloc_databuf(p) != 0)
 208                 goto bad;
 209
 210         /*
 211          * "p->fd" is a FD for a STREAMS device, so "select()" and
 212          * "poll()" should work on it.
 213          */
 214         p->selectable_fd = p->fd;
 215
 216         p->read_op = pcap_read_libdlpi;
 217         p->inject_op = pcap_inject_libdlpi;
 218         p->setfilter_op = install_bpf_program;  /* No kernel filtering */
 219         p->setdirection_op = NULL;      /* Not implemented */
 220         p->set_datalink_op = NULL;      /* Can't change data link type */
 221         p->getnonblock_op = pcap_getnonblock_fd;
 222         p->setnonblock_op = pcap_setnonblock_fd;
 223         p->stats_op = pcap_stats_dlpi;
 224         p->cleanup_op = pcap_cleanup_libdlpi;
 225
 226         return (0);
 227 bad:
 228         pcap_cleanup_libdlpi(p);
 229         return (err);
 230 }
 231
 232 #define STRINGIFY(n)    #n
 233
 234 static int
 235 dlpromiscon(pcap_t *p, bpf_u_int32 level)
 236 {
 237         int retv;
 238         int err;
 239
 240         retv = dlpi_promiscon(p->dlpi_hd, level);
 241         if (retv != DLPI_SUCCESS) {
 242                 if (retv == DL_SYSERR &&
 243                     (errno == EPERM || errno == EACCES))
 244                         err = PCAP_ERROR_PERM_DENIED;
 245                 else
 246                         err = PCAP_ERROR;
 247                 pcap_libdlpi_err(p->opt.source, "dlpi_promiscon" STRINGIFY(level),
 248                     retv, p->errbuf);
 249                 return (err);
 250         }
 251         return (0);
 252 }
 253
 254 /*
 255  * In Solaris, the "standard" mechanism" i.e SIOCGLIFCONF will only find
 256  * network links that are plumbed and are up. dlpi_walk(3DLPI) will find
 257  * additional network links present in the system.
 258  */
 259 int
 260 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
 261 {
 262         int retv = 0;
 263
 264         linknamelist_t  *entry, *next;
 265         linkwalk_t      lw = {NULL, 0};
 266         int             save_errno;
 267
 268         /* dlpi_walk() for loopback will be added here. */
 269
 270         dlpi_walk(list_interfaces, &lw, 0);
 271
 272         if (lw.lw_err != 0) {
 273                 snprintf(errbuf, PCAP_ERRBUF_SIZE,
 274                     "dlpi_walk: %s", pcap_strerror(lw.lw_err));
 275                 retv = -1;
 276                 goto done;
 277         }
 278
 279         /* Add linkname if it does not exist on the list. */
 280         for (entry = lw.lw_list; entry != NULL; entry = entry->lnl_next) {
 281                 if (pcap_add_if(alldevsp, entry->linkname, 0, NULL, errbuf) < 0)
 282                         retv = -1;
 283         }
 284 done:
 285         save_errno = errno;
 286         for (entry = lw.lw_list; entry != NULL; entry = next) {
 287                 next = entry->lnl_next;
 288                 free(entry);
 289         }
 290         errno = save_errno;
 291
 292         return (retv);
 293 }
 294
 295 /*
 296  * Read data received on DLPI handle. Returns -2 if told to terminate, else
 297  * returns the number of packets read.
 298  */
 299 static int
 300 pcap_read_libdlpi(pcap_t *p, int count, pcap_handler callback, u_char *user)
 301 {
 302         int len;
 303         u_char *bufp;
 304         size_t msglen;
 305         int retv;
 306
 307         len = p->cc;
 308         if (len != 0) {
 309                 bufp = p->bp;
 310                 goto process_pkts;
 311         }
 312         do {
 313                 /* Has "pcap_breakloop()" been called? */
 314                 if (p->break_loop) {
 315                         /*
 316                          * Yes - clear the flag that indicates that it has,
 317                          * and return -2 to indicate that we were told to
 318                          * break out of the loop.
 319                          */
 320                         p->break_loop = 0;
 321                         return (-2);
 322                 }
 323
 324                 msglen = p->bufsize;
 325                 bufp = p->buffer + p->offset;
 326
 327                 retv = dlpi_recv(p->dlpi_hd, NULL, NULL, bufp,
 328                     &msglen, -1, NULL);
 329                 if (retv != DLPI_SUCCESS) {
 330                         /*
 331                          * This is most likely a call to terminate out of the
 332                          * loop. So, do not return an error message, instead
 333                          * check if "pcap_breakloop()" has been called above.
 334                          */
 335                         if (retv == DL_SYSERR && errno == EINTR) {
 336                                 len = 0;
 337                                 continue;
 338                         }
 339                         pcap_libdlpi_err(dlpi_linkname(p->dlpi_hd),
 340                             "dlpi_recv", retv, p->errbuf);
 341                         return (-1);
 342                 }
 343                 len = msglen;
 344         } while (len == 0);
 345
 346 process_pkts:
 347         return (pcap_process_pkts(p, callback, user, count, bufp, len));
 348 }
 349
 350 static int
 351 pcap_inject_libdlpi(pcap_t *p, const void *buf, size_t size)
 352 {
 353         int retv;
 354
 355         retv = dlpi_send(p->dlpi_hd, NULL, 0, buf, size, NULL);
 356         if (retv != DLPI_SUCCESS) {
 357                 pcap_libdlpi_err(dlpi_linkname(p->dlpi_hd), "dlpi_send", retv,
 358                     p->errbuf);
 359                 return (-1);
 360         }
 361         /*
 362          * dlpi_send(3DLPI) does not provide a way to return the number of
 363          * bytes sent on the wire. Based on the fact that DLPI_SUCCESS was
 364          * returned we are assuming 'size' bytes were sent.
 365          */
 366         return (size);
 367 }
 368
 369 /*
 370  * Close dlpi handle.
 371  */
 372 static void
 373 pcap_cleanup_libdlpi(pcap_t *p)
 374 {
 375         if (p->dlpi_hd != NULL) {
 376                 dlpi_close(p->dlpi_hd);
 377                 p->dlpi_hd = NULL;
 378                 p->fd = -1;
 379         }
 380         pcap_cleanup_live_common(p);
 381 }
 382
 383 /*
 384  * Write error message to buffer.
 385  */
 386 static void
 387 pcap_libdlpi_err(const char *linkname, const char *func, int err, char *errbuf)
 388 {
 389         snprintf(errbuf, PCAP_ERRBUF_SIZE, "libpcap: %s failed on %s: %s",
 390             func, linkname, dlpi_strerror(err));
 391 }
 392
 393 pcap_t *
 394 pcap_create_interface(const char *device, char *ebuf)
 395 {
 396         pcap_t *p;
 397
 398         p = pcap_create_common(device, ebuf);
 399         if (p == NULL)
 400                 return (NULL);
 401
 402         p->activate_op = pcap_activate_libdlpi;
 403         return (p);
 404 }