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 1.1.2.6 2008-04-14 20:41:52 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         /*
 108          * Enable Solaris raw and passive DLPI extensions;
 109          * dlpi_open() will not fail if the underlying link does not support
 110          * passive mode. See dlpi(7P) for details.
 111          */
 112         retv = dlpi_open(p->opt.source, &dh, DLPI_RAW|DLPI_PASSIVE);
 113         if (retv != DLPI_SUCCESS) {
 114                 if (retv == DLPI_ELINKNAMEINVAL || retv == DLPI_ENOLINK)
 115                         err = PCAP_ERROR_NO_SUCH_DEVICE;
 116                 else if (retv == DLPI_SYSERR && errno == EACCES)
 117                         err = PCAP_ERROR_PERM_DENIED;
 118                 pcap_libdlpi_err(p->opt.source, "dlpi_open", retv,
 119                     p->errbuf);
 120                 return (err);
 121         }
 122         p->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                 err = PCAP_ERROR_RFMON_NOTSUP;
 130                 goto bad;
 131         }
 132
 133         /* Bind with DLPI_ANY_SAP. */
 134         if ((retv = dlpi_bind(p->dlpi_hd, DLPI_ANY_SAP, 0)) != DLPI_SUCCESS) {
 135                 pcap_libdlpi_err(p->opt.source, "dlpi_bind", retv, p->errbuf);
 136                 goto bad;
 137         }
 138
 139         /* Enable promiscuous mode. */
 140         if (p->opt.promisc) {
 141                 retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_PHYS);
 142                 if (retv != DLPI_SUCCESS) {
 143                         pcap_libdlpi_err(p->opt.source,
 144                             "dlpi_promisc(PHYSICAL)", retv, p->errbuf);
 145                         goto bad;
 146                 }
 147         } else {
 148                 /* Try to enable multicast. */
 149                 retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_MULTI);
 150                 if (retv != DLPI_SUCCESS) {
 151                         pcap_libdlpi_err(p->opt.source, "dlpi_promisc(MULTI)",
 152                             retv, p->errbuf);
 153                         goto bad;
 154                 }
 155         }
 156
 157         /* Try to enable SAP promiscuity. */
 158         if ((retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_SAP)) != DLPI_SUCCESS) {
 159                 if (!promisc) {
 160                         pcap_libdlpi_err(p->opt.source, "dlpi_promisc(SAP)",
 161                             retv, p->errbuf);
 162                         goto bad;
 163                 }
 164
 165                 /* Not fatal, since the DL_PROMISC_PHYS mode worked. */
 166                 fprintf(stderr, "WARNING: dlpi_promisc(SAP) failed on"
 167                     " %s:(%s)\n", p->opt.source, dlpi_strerror(retv));
 168         }
 169
 170         /* Determine link type.  */
 171         if ((retv = dlpi_info(p->dlpi_hd, &dlinfo, 0)) != DLPI_SUCCESS) {
 172                 pcap_libdlpi_err(p->opt.source, "dlpi_info", retv, p->errbuf);
 173                 goto bad;
 174         }
 175
 176         if (pcap_process_mactype(p, dlinfo.di_mactype) != 0)
 177                 goto bad;
 178
 179         p->fd = dlpi_fd(p->dlpi_hd);
 180
 181         /* Push and configure bufmod. */
 182         if (pcap_conf_bufmod(p, snaplen, p->md.timeout) != 0)
 183                 goto bad;
 184
 185         /*
 186          * Flush the read side.
 187          */
 188         if (ioctl(p->fd, I_FLUSH, FLUSHR) != 0) {
 189                 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "FLUSHR: %s",
 190                     pcap_strerror(errno));
 191                 goto bad;
 192         }
 193
 194         /* Allocate data buffer. */
 195         if (pcap_alloc_databuf(p) != 0)
 196                 goto bad;
 197
 198         /*
 199          * "p->fd" is a FD for a STREAMS device, so "select()" and
 200          * "poll()" should work on it.
 201          */
 202         p->selectable_fd = p->fd;
 203
 204         p->read_op = pcap_read_libdlpi;
 205         p->inject_op = pcap_inject_libdlpi;
 206         p->setfilter_op = install_bpf_program;  /* No kernel filtering */
 207         p->setdirection_op = NULL;      /* Not implemented */
 208         p->set_datalink_op = NULL;      /* Can't change data link type */
 209         p->getnonblock_op = pcap_getnonblock_fd;
 210         p->setnonblock_op = pcap_setnonblock_fd;
 211         p->stats_op = pcap_stats_dlpi;
 212         p->cleanup_op = pcap_cleanup_libdlpi;
 213
 214         return (0);
 215 bad:
 216         pcap_cleanup_libdlpi(p);
 217         return (err);
 218 }
 219
 220 /*
 221  * In Solaris, the "standard" mechanism" i.e SIOCGLIFCONF will only find
 222  * network links that are plumbed and are up. dlpi_walk(3DLPI) will find
 223  * additional network links present in the system.
 224  */
 225 int
 226 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
 227 {
 228         int retv = 0;
 229
 230         linknamelist_t  *entry, *next;
 231         linkwalk_t      lw = {NULL, 0};
 232         int             save_errno;
 233
 234         /* dlpi_walk() for loopback will be added here. */
 235
 236         dlpi_walk(list_interfaces, &lw, 0);
 237
 238         if (lw.lw_err != 0) {
 239                 snprintf(errbuf, PCAP_ERRBUF_SIZE,
 240                     "dlpi_walk: %s", pcap_strerror(lw.lw_err));
 241                 retv = -1;
 242                 goto done;
 243         }
 244
 245         /* Add linkname if it does not exist on the list. */
 246         for (entry = lw.lw_list; entry != NULL; entry = entry->lnl_next) {
 247                 if (pcap_add_if(alldevsp, entry->linkname, 0, NULL, errbuf) < 0)
 248                         retv = -1;
 249         }
 250 done:
 251         save_errno = errno;
 252         for (entry = lw.lw_list; entry != NULL; entry = next) {
 253                 next = entry->lnl_next;
 254                 free(entry);
 255         }
 256         errno = save_errno;
 257
 258         return (retv);
 259 }
 260
 261 /*
 262  * Read data received on DLPI handle. Returns -2 if told to terminate, else
 263  * returns the number of packets read.
 264  */
 265 static int
 266 pcap_read_libdlpi(pcap_t *p, int count, pcap_handler callback, u_char *user)
 267 {
 268         int len;
 269         u_char *bufp;
 270         size_t msglen;
 271         int retv;
 272
 273         len = p->cc;
 274         if (len != 0) {
 275                 bufp = p->bp;
 276                 goto process_pkts;
 277         }
 278         do {
 279                 /* Has "pcap_breakloop()" been called? */
 280                 if (p->break_loop) {
 281                         /*
 282                          * Yes - clear the flag that indicates that it has,
 283                          * and return -2 to indicate that we were told to
 284                          * break out of the loop.
 285                          */
 286                         p->break_loop = 0;
 287                         return (-2);
 288                 }
 289
 290                 msglen = p->bufsize;
 291                 bufp = p->buffer + p->offset;
 292
 293                 retv = dlpi_recv(p->dlpi_hd, NULL, NULL, bufp,
 294                     &msglen, -1, NULL);
 295                 if (retv != DLPI_SUCCESS) {
 296                         /*
 297                          * This is most likely a call to terminate out of the
 298                          * loop. So, do not return an error message, instead
 299                          * check if "pcap_breakloop()" has been called above.
 300                          */
 301                         if (retv == DL_SYSERR && errno == EINTR) {
 302                                 len = 0;
 303                                 continue;
 304                         }
 305                         pcap_libdlpi_err(dlpi_linkname(p->dlpi_hd),
 306                             "dlpi_recv", retv, p->errbuf);
 307                         return (-1);
 308                 }
 309                 len = msglen;
 310         } while (len == 0);
 311
 312 process_pkts:
 313         return (pcap_process_pkts(p, callback, user, count, bufp, len));
 314 }
 315
 316 static int
 317 pcap_inject_libdlpi(pcap_t *p, const void *buf, size_t size)
 318 {
 319         int retv;
 320
 321         retv = dlpi_send(p->dlpi_hd, NULL, 0, buf, size, NULL);
 322         if (retv != DLPI_SUCCESS) {
 323                 pcap_libdlpi_err(dlpi_linkname(p->dlpi_hd), "dlpi_send", retv,
 324                     p->errbuf);
 325                 return (-1);
 326         }
 327         /*
 328          * dlpi_send(3DLPI) does not provide a way to return the number of
 329          * bytes sent on the wire. Based on the fact that DLPI_SUCCESS was
 330          * returned we are assuming 'size' bytes were sent.
 331          */
 332         return (size);
 333 }
 334
 335 /*
 336  * Close dlpi handle.
 337  */
 338 static void
 339 pcap_cleanup_libdlpi(pcap_t *p)
 340 {
 341         if (p->dlpi_hd != NULL) {
 342                 dlpi_close(p->dlpi_hd);
 343                 p->dlpi_hd = NULL;
 344                 p->fd = -1;
 345         }
 346         pcap_cleanup_live_common(p);
 347 }
 348
 349 /*
 350  * Write error message to buffer.
 351  */
 352 static void
 353 pcap_libdlpi_err(const char *linkname, const char *func, int err, char *errbuf)
 354 {
 355         snprintf(errbuf, PCAP_ERRBUF_SIZE, "libpcap: %s failed on %s: %s",
 356             func, linkname, dlpi_strerror(err));
 357 }
 358
 359 pcap_t *
 360 pcap_create(const char *device, char *ebuf)
 361 {
 362         pcap_t *p;
 363
 364         p = pcap_create_common(device, ebuf);
 365         if (p == NULL)
 366                 return (NULL);
 367
 368         p->activate_op = pcap_activate_libdlpi;
 369         return (p);
 370 }