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 1.1.2.2 2008-03-15 04:15:46 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 pcap_t *
 100 pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
 101     char *ebuf)
 102 {
 103         int retv;
 104         pcap_t *p;
 105         dlpi_handle_t dh;
 106         dlpi_info_t dlinfo;
 107         bpf_u_int32 ss, chunksize;
 108
 109         if ((p = (pcap_t *)malloc(sizeof(*p))) == NULL) {
 110                 strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
 111                 return (NULL);
 112         }
 113         memset(p, 0, sizeof(*p));
 114         p->fd = -1;     /* indicate that it hasn't been opened yet */
 115         p->send_fd = -1;
 116
 117         /*
 118          * Enable Solaris raw and passive DLPI extensions;
 119          * dlpi_open() will not fail if the underlying link does not support
 120          * passive mode. See dlpi(7P) for details.
 121          */
 122         retv = dlpi_open(device, &dh, DLPI_RAW|DLPI_PASSIVE);
 123         if (retv != DLPI_SUCCESS) {
 124                 pcap_libdlpi_err(device, "dlpi_open", retv, ebuf);
 125                 goto bad;
 126         }
 127         p->dlpi_hd = dh;
 128
 129         p->snapshot = snaplen;
 130
 131         /* Bind with DLPI_ANY_SAP. */
 132         if ((retv = dlpi_bind(p->dlpi_hd, DLPI_ANY_SAP, 0)) != DLPI_SUCCESS) {
 133                 pcap_libdlpi_err(device, "dlpi_bind", retv, ebuf);
 134                 goto bad;
 135         }
 136
 137         /* Enable promiscuous mode. */
 138         if (promisc) {
 139                 retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_PHYS);
 140                 if (retv != DLPI_SUCCESS) {
 141                         pcap_libdlpi_err(device, "dlpi_promisc(PHYSICAL)",
 142                             retv, ebuf);
 143                         goto bad;
 144                 }
 145         } else {
 146                 /* Try to enable multicast. */
 147                 retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_MULTI);
 148                 if (retv != DLPI_SUCCESS) {
 149                         pcap_libdlpi_err(device, "dlpi_promisc(MULTI)",
 150                             retv, ebuf);
 151                         goto bad;
 152                 }
 153         }
 154
 155         /* Try to enable SAP promiscuity. */
 156         if ((retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_SAP)) != DLPI_SUCCESS) {
 157                 if (!promisc) {
 158                         pcap_libdlpi_err(device, "dlpi_promisc(SAP)",
 159                             retv, ebuf);
 160                         goto bad;
 161                 }
 162
 163                 /* Not fatal, since the DL_PROMISC_PHYS mode worked. */
 164                 fprintf(stderr, "WARNING: dlpi_promisc(SAP) failed on"
 165                     " %s:(%s)\n", device, dlpi_strerror(retv));
 166         }
 167
 168         /* Determine link type.  */
 169         if ((retv = dlpi_info(p->dlpi_hd, &dlinfo, 0)) != DLPI_SUCCESS) {
 170                 pcap_libdlpi_err(device, "dlpi_info", retv, ebuf);
 171                 goto bad;
 172         }
 173
 174         if (pcap_process_mactype(p, dlinfo.di_mactype, ebuf) != 0)
 175                 goto bad;
 176
 177         p->fd = dlpi_fd(p->dlpi_hd);
 178
 179         /* Push and configure bufmod. */
 180         if (pcap_conf_bufmod(p, ss, to_ms, ebuf) != 0)
 181                 goto bad;
 182
 183         /*
 184          * Flush the read side.
 185          */
 186         if (ioctl(p->fd, I_FLUSH, FLUSHR) != 0) {
 187                 snprintf(ebuf, PCAP_ERRBUF_SIZE, "FLUSHR: %s",
 188                     pcap_strerror(errno));
 189                 goto bad;
 190         }
 191
 192         /* Allocate data buffer. */
 193         if (pcap_alloc_databuf(p, ebuf) != 0)
 194                 goto bad;
 195
 196         /*
 197          * "p->fd" is a FD for a STREAMS device, so "select()" and
 198          * "poll()" should work on it.
 199          */
 200         p->selectable_fd = p->fd;
 201
 202         p->read_op = pcap_read_libdlpi;
 203         p->inject_op = pcap_inject_libdlpi;
 204         p->setfilter_op = install_bpf_program;  /* No kernel filtering */
 205         p->setdirection_op = NULL;      /* Not implemented */
 206         p->set_datalink_op = NULL;      /* Can't change data link type */
 207         p->getnonblock_op = pcap_getnonblock_fd;
 208         p->setnonblock_op = pcap_setnonblock_fd;
 209         p->stats_op = pcap_stats_dlpi;
 210         p->close_op = pcap_close_libdlpi;
 211
 212         return (p);
 213 bad:
 214         /* Get rid of any link-layer type list we allocated. */
 215         if (p->dlt_list != NULL)
 216                 free(p->dlt_list);
 217         pcap_close_libdlpi(p);
 218         free(p);
 219         return (NULL);
 220 }
 221
 222 /*
 223  * In Solaris, the "standard" mechanism" i.e SIOCGLIFCONF will only find
 224  * network links that are plumbed and are up. dlpi_walk(3DLPI) will find
 225  * additional network links present in the system.
 226  */
 227 int
 228 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
 229 {
 230         int retv = 0;
 231
 232         linknamelist_t  *entry, *next;
 233         linkwalk_t      lw = {NULL, 0};
 234         int             save_errno;
 235
 236         /* dlpi_walk() for loopback will be added here. */
 237
 238         dlpi_walk(list_interfaces, &lw, 0);
 239
 240         if (lw.lw_err != 0) {
 241                 snprintf(errbuf, PCAP_ERRBUF_SIZE,
 242                     "dlpi_walk: %s", pcap_strerror(lw.lw_err));
 243                 retv = -1;
 244                 goto done;
 245         }
 246
 247         /* Add linkname if it does not exist on the list. */
 248         for (entry = lw.lw_list; entry != NULL; entry = entry->lnl_next) {
 249                 if (pcap_add_if(alldevsp, entry->linkname, 0, NULL, errbuf) < 0)
 250                         retv = -1;
 251         }
 252 done:
 253         save_errno = errno;
 254         for (entry = lw.lw_list; entry != NULL; entry = next) {
 255                 next = entry->lnl_next;
 256                 free(entry);
 257         }
 258         errno = save_errno;
 259
 260         return (retv);
 261 }
 262
 263 /*
 264  * Read data received on DLPI handle. Returns -2 if told to terminate, else
 265  * returns the number of packets read.
 266  */
 267 static int
 268 pcap_read_libdlpi(pcap_t *p, int count, pcap_handler callback, u_char *user)
 269 {
 270         int len;
 271         u_char *bufp;
 272         size_t msglen;
 273         int retv;
 274
 275         len = p->cc;
 276         if (len != 0) {
 277                 bufp = p->bp;
 278                 goto process_pkts;
 279         }
 280         do {
 281                 /* Has "pcap_breakloop()" been called? */
 282                 if (p->break_loop) {
 283                         /*
 284                          * Yes - clear the flag that indicates that it has,
 285                          * and return -2 to indicate that we were told to
 286                          * break out of the loop.
 287                          */
 288                         p->break_loop = 0;
 289                         return (-2);
 290                 }
 291
 292                 msglen = p->bufsize;
 293                 bufp = p->buffer + p->offset;
 294
 295                 retv = dlpi_recv(p->dlpi_hd, NULL, NULL, bufp,
 296                     &msglen, -1, NULL);
 297                 if (retv != DLPI_SUCCESS) {
 298                         /*
 299                          * This is most likely a call to terminate out of the
 300                          * loop. So, do not return an error message, instead
 301                          * check if "pcap_breakloop()" has been called above.
 302                          */
 303                         if (retv == DL_SYSERR && errno == EINTR) {
 304                                 len = 0;
 305                                 continue;
 306                         }
 307                         pcap_libdlpi_err(dlpi_linkname(p->dlpi_hd),
 308                             "dlpi_recv", retv, p->errbuf);
 309                         return (-1);
 310                 }
 311                 len = msglen;
 312         } while (len == 0);
 313
 314 process_pkts:
 315         return (pcap_process_pkts(p, callback, user, count, bufp, len));
 316 }
 317
 318 static int
 319 pcap_inject_libdlpi(pcap_t *p, const void *buf, size_t size)
 320 {
 321         int retv;
 322
 323         retv = dlpi_send(p->dlpi_hd, NULL, 0, buf, size, NULL);
 324         if (retv != DLPI_SUCCESS) {
 325                 pcap_libdlpi_err(dlpi_linkname(p->dlpi_hd), "dlpi_send", retv,
 326                     p->errbuf);
 327                 return (-1);
 328         }
 329         /*
 330          * dlpi_send(3DLPI) does not provide a way to return the number of
 331          * bytes sent on the wire. Based on the fact that DLPI_SUCCESS was
 332          * returned we are assuming 'size' bytes were sent.
 333          */
 334         return (size);
 335 }
 336
 337 /*
 338  * Close dlpi handle and deallocate data buffer.
 339  */
 340 static void
 341 pcap_close_libdlpi(pcap_t *p)
 342 {
 343         dlpi_close(p->dlpi_hd);
 344         free(p->buffer);
 345 }
 346
 347 /*
 348  * Write error message to buffer.
 349  */
 350 static void
 351 pcap_libdlpi_err(const char *linkname, const char *func, int err, char *errbuf)
 352 {
 353         snprintf(errbuf, PCAP_ERRBUF_SIZE, "libpcap: %s failed on %s: %s",
 354             func, linkname, dlpi_strerror(err));
 355 }