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 1.5 2008-04-09 19:58:02 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 pcap_read_libdlpi(pcap_t *, int, pcap_handler, u_char *);
  53 static int pcap_inject_libdlpi(pcap_t *, const void *, size_t);
  54 static void pcap_close_libdlpi(pcap_t *);
  55 static void pcap_libdlpi_err(const char *, const char *, int, char *);
  56
  57 /*
  58  * list_interfaces() will list all the network links that are
  59  * available on a system.
  60  */
  61 static boolean_t list_interfaces(const char *, void *);
  62
  63 typedef struct linknamelist {
  64         char    linkname[DLPI_LINKNAME_MAX];
  65         struct linknamelist *lnl_next;
  66 } linknamelist_t;
  67
  68 typedef struct linkwalk {
  69         linknamelist_t  *lw_list;
  70         int             lw_err;
  71 } linkwalk_t;
  72
  73 /*
  74  * The caller of this function should free the memory allocated
  75  * for each linknamelist_t "entry" allocated.
  76  */
  77 static boolean_t
  78 list_interfaces(const char *linkname, void *arg)
  79 {
  80         linkwalk_t      *lwp = arg;
  81         linknamelist_t  *entry;
  82
  83         if ((entry = calloc(1, sizeof(linknamelist_t))) == NULL) {
  84                 lwp->lw_err = ENOMEM;
  85                 return (B_TRUE);
  86         }
  87         (void) strlcpy(entry->linkname, linkname, DLPI_LINKNAME_MAX);
  88
  89         if (lwp->lw_list == NULL) {
  90                 lwp->lw_list = entry;
  91         } else {
  92                 entry->lnl_next = lwp->lw_list;
  93                 lwp->lw_list = entry;
  94         }
  95
  96         return (B_FALSE);
  97 }
  98
  99 static int
 100 pcap_activate_libdlpi(pcap_t *p)
 101 {
 102         int retv;
 103         dlpi_handle_t dh;
 104         dlpi_info_t dlinfo;
 105         int err = PCAP_ERROR;
 106
 107         p->fd = -1;     /* indicate that it hasn't been opened yet */
 108
 109         /*
 110          * Enable Solaris raw and passive DLPI extensions;
 111          * dlpi_open() will not fail if the underlying link does not support
 112          * passive mode. See dlpi(7P) for details.
 113          */
 114         retv = dlpi_open(p->opt.source, &dh, DLPI_RAW|DLPI_PASSIVE);
 115         if (retv != DLPI_SUCCESS) {
 116                 if (retv == DLPI_ELINKNAMEINVAL || retv == DLPI_ENOLINK)
 117                         err = PCAP_ERROR_NO_SUCH_DEVICE;
 118                 else if (retv == DLPI_SYSERR && 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                 retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_PHYS);
 144                 if (retv != DLPI_SUCCESS) {
 145                         pcap_libdlpi_err(p->opt.source,
 146                             "dlpi_promisc(PHYSICAL)", retv, p->errbuf);
 147                         goto bad;
 148                 }
 149         } else {
 150                 /* Try to enable multicast. */
 151                 retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_MULTI);
 152                 if (retv != DLPI_SUCCESS) {
 153                         pcap_libdlpi_err(p->opt.source, "dlpi_promisc(MULTI)",
 154                             retv, p->errbuf);
 155                         goto bad;
 156                 }
 157         }
 158
 159         /* Try to enable SAP promiscuity. */
 160         if ((retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_SAP)) != DLPI_SUCCESS) {
 161                 if (!promisc) {
 162                         pcap_libdlpi_err(p->opt.source, "dlpi_promisc(SAP)",
 163                             retv, p->errbuf);
 164                         goto bad;
 165                 }
 166
 167                 /* Not fatal, since the DL_PROMISC_PHYS mode worked. */
 168                 fprintf(stderr, "WARNING: dlpi_promisc(SAP) failed on"
 169                     " %s:(%s)\n", p->opt.source, dlpi_strerror(retv));
 170         }
 171
 172         /* Determine link type.  */
 173         if ((retv = dlpi_info(p->dlpi_hd, &dlinfo, 0)) != DLPI_SUCCESS) {
 174                 pcap_libdlpi_err(p->opt.source, "dlpi_info", retv, p->errbuf);
 175                 goto bad;
 176         }
 177
 178         if (pcap_process_mactype(p, dlinfo.di_mactype) != 0)
 179                 goto bad;
 180
 181         p->fd = dlpi_fd(p->dlpi_hd);
 182
 183         /* Push and configure bufmod. */
 184         if (pcap_conf_bufmod(p, snaplen, p->md.timeout) != 0)
 185                 goto bad;
 186
 187         /*
 188          * Flush the read side.
 189          */
 190         if (ioctl(p->fd, I_FLUSH, FLUSHR) != 0) {
 191                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "FLUSHR: %s",
 192                     pcap_strerror(errno));
 193                 goto bad;
 194         }
 195
 196         /* Allocate data buffer. */
 197         if (pcap_alloc_databuf(p) != 0)
 198                 goto bad;
 199
 200         /*
 201          * "p->fd" is a FD for a STREAMS device, so "select()" and
 202          * "poll()" should work on it.
 203          */
 204         p->selectable_fd = p->fd;
 205
 206         p->read_op = pcap_read_libdlpi;
 207         p->inject_op = pcap_inject_libdlpi;
 208         p->setfilter_op = install_bpf_program;  /* No kernel filtering */
 209         p->setdirection_op = NULL;      /* Not implemented */
 210         p->set_datalink_op = NULL;      /* Can't change data link type */
 211         p->getnonblock_op = pcap_getnonblock_fd;
 212         p->setnonblock_op = pcap_setnonblock_fd;
 213         p->stats_op = pcap_stats_dlpi;
 214         p->close_op = pcap_close_libdlpi;
 215
 216         return (0);
 217 bad:
 218         /* Get rid of any link-layer type list we allocated. */
 219         if (p->dlt_list != NULL)
 220                 free(p->dlt_list);
 221         dlpi_close(p->dlpi_hd);
 222         return (err);
 223 }
 224
 225 /*
 226  * In Solaris, the "standard" mechanism" i.e SIOCGLIFCONF will only find
 227  * network links that are plumbed and are up. dlpi_walk(3DLPI) will find
 228  * additional network links present in the system.
 229  */
 230 int
 231 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
 232 {
 233         int retv = 0;
 234
 235         linknamelist_t  *entry, *next;
 236         linkwalk_t      lw = {NULL, 0};
 237         int             save_errno;
 238
 239         /* dlpi_walk() for loopback will be added here. */
 240
 241         dlpi_walk(list_interfaces, &lw, 0);
 242
 243         if (lw.lw_err != 0) {
 244                 snprintf(errbuf, PCAP_ERRBUF_SIZE,
 245                     "dlpi_walk: %s", pcap_strerror(lw.lw_err));
 246                 retv = -1;
 247                 goto done;
 248         }
 249
 250         /* Add linkname if it does not exist on the list. */
 251         for (entry = lw.lw_list; entry != NULL; entry = entry->lnl_next) {
 252                 if (pcap_add_if(alldevsp, entry->linkname, 0, NULL, errbuf) < 0)
 253                         retv = -1;
 254         }
 255 done:
 256         save_errno = errno;
 257         for (entry = lw.lw_list; entry != NULL; entry = next) {
 258                 next = entry->lnl_next;
 259                 free(entry);
 260         }
 261         errno = save_errno;
 262
 263         return (retv);
 264 }
 265
 266 /*
 267  * Read data received on DLPI handle. Returns -2 if told to terminate, else
 268  * returns the number of packets read.
 269  */
 270 static int
 271 pcap_read_libdlpi(pcap_t *p, int count, pcap_handler callback, u_char *user)
 272 {
 273         int len;
 274         u_char *bufp;
 275         size_t msglen;
 276         int retv;
 277
 278         len = p->cc;
 279         if (len != 0) {
 280                 bufp = p->bp;
 281                 goto process_pkts;
 282         }
 283         do {
 284                 /* Has "pcap_breakloop()" been called? */
 285                 if (p->break_loop) {
 286                         /*
 287                          * Yes - clear the flag that indicates that it has,
 288                          * and return -2 to indicate that we were told to
 289                          * break out of the loop.
 290                          */
 291                         p->break_loop = 0;
 292                         return (-2);
 293                 }
 294
 295                 msglen = p->bufsize;
 296                 bufp = p->buffer + p->offset;
 297
 298                 retv = dlpi_recv(p->dlpi_hd, NULL, NULL, bufp,
 299                     &msglen, -1, NULL);
 300                 if (retv != DLPI_SUCCESS) {
 301                         /*
 302                          * This is most likely a call to terminate out of the
 303                          * loop. So, do not return an error message, instead
 304                          * check if "pcap_breakloop()" has been called above.
 305                          */
 306                         if (retv == DL_SYSERR && errno == EINTR) {
 307                                 len = 0;
 308                                 continue;
 309                         }
 310                         pcap_libdlpi_err(dlpi_linkname(p->dlpi_hd),
 311                             "dlpi_recv", retv, p->errbuf);
 312                         return (-1);
 313                 }
 314                 len = msglen;
 315         } while (len == 0);
 316
 317 process_pkts:
 318         return (pcap_process_pkts(p, callback, user, count, bufp, len));
 319 }
 320
 321 static int
 322 pcap_inject_libdlpi(pcap_t *p, const void *buf, size_t size)
 323 {
 324         int retv;
 325
 326         retv = dlpi_send(p->dlpi_hd, NULL, 0, buf, size, NULL);
 327         if (retv != DLPI_SUCCESS) {
 328                 pcap_libdlpi_err(dlpi_linkname(p->dlpi_hd), "dlpi_send", retv,
 329                     p->errbuf);
 330                 return (-1);
 331         }
 332         /*
 333          * dlpi_send(3DLPI) does not provide a way to return the number of
 334          * bytes sent on the wire. Based on the fact that DLPI_SUCCESS was
 335          * returned we are assuming 'size' bytes were sent.
 336          */
 337         return (size);
 338 }
 339
 340 /*
 341  * Close dlpi handle and deallocate data buffer.
 342  */
 343 static void
 344 pcap_close_libdlpi(pcap_t *p)
 345 {
 346         dlpi_close(p->dlpi_hd);
 347         free(p->buffer);
 348 }
 349
 350 /*
 351  * Write error message to buffer.
 352  */
 353 static void
 354 pcap_libdlpi_err(const char *linkname, const char *func, int err, char *errbuf)
 355 {
 356         snprintf(errbuf, PCAP_ERRBUF_SIZE, "libpcap: %s failed on %s: %s",
 357             func, linkname, dlpi_strerror(err));
 358 }
 359
 360 pcap_t *
 361 pcap_create(const char *device, char *ebuf)
 362 {
 363         pcap_t *p;
 364
 365         p = pcap_create_common(device, ebuf);
 366         if (p == NULL)
 367                 return (NULL);
 368
 369         p->activate_op = pcap_activate_libdlpi;
 370         return (p);
 371 }