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pcap-libdlpi.c

/*
 * Copyright (c) 1993, 1994, 1995, 1996, 1997
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * This code contributed by Sagun Shakya (sagun.shakya@sun.com)
 */
/*
 * Packet capture routines for DLPI using libdlpi under SunOS 5.11.
 */

#ifndef lint
static const char rcsid[] _U_ =
      "@(#) $Header: /tcpdump/master/libpcap/pcap-libdlpi.c,v 1.1.2.6 2008-04-14 20:41:52 guy Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/types.h>
#include <sys/time.h>
#include <sys/bufmod.h>
#include <sys/stream.h>
#include <libdlpi.h>
#include <errno.h>
#include <memory.h>
#include <stropts.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "pcap-int.h"
#include "dlpisubs.h"

/* Forwards. */
static int pcap_read_libdlpi(pcap_t *, int, pcap_handler, u_char *);
static int pcap_inject_libdlpi(pcap_t *, const void *, size_t);
static void pcap_close_libdlpi(pcap_t *);
static void pcap_libdlpi_err(const char *, const char *, int, char *);

/*
 * list_interfaces() will list all the network links that are
 * available on a system.
 */
static boolean_t list_interfaces(const char *, void *);

typedef struct linknamelist {
      char  linkname[DLPI_LINKNAME_MAX];
      struct linknamelist *lnl_next;
} linknamelist_t;

typedef struct linkwalk {
      linknamelist_t    *lw_list;
      int         lw_err;
} linkwalk_t;

/*
 * The caller of this function should free the memory allocated
 * for each linknamelist_t "entry" allocated.
 */
static boolean_t
list_interfaces(const char *linkname, void *arg)
{
      linkwalk_t  *lwp = arg;
      linknamelist_t    *entry;

      if ((entry = calloc(1, sizeof(linknamelist_t))) == NULL) {
            lwp->lw_err = ENOMEM;
            return (B_TRUE);
      }
      (void) strlcpy(entry->linkname, linkname, DLPI_LINKNAME_MAX);

      if (lwp->lw_list == NULL) {
            lwp->lw_list = entry;
      } else {
            entry->lnl_next = lwp->lw_list;
            lwp->lw_list = entry;
      }

      return (B_FALSE);
}

static int
pcap_activate_libdlpi(pcap_t *p)
{
      int retv;
      dlpi_handle_t dh;
      dlpi_info_t dlinfo;
      int err = PCAP_ERROR;

      /*
       * Enable Solaris raw and passive DLPI extensions;
       * dlpi_open() will not fail if the underlying link does not support
       * passive mode. See dlpi(7P) for details.
       */
      retv = dlpi_open(p->opt.source, &dh, DLPI_RAW|DLPI_PASSIVE);
      if (retv != DLPI_SUCCESS) {
            if (retv == DLPI_ELINKNAMEINVAL || retv == DLPI_ENOLINK)
                  err = PCAP_ERROR_NO_SUCH_DEVICE;
            else if (retv == DLPI_SYSERR && errno == EACCES)
                  err = PCAP_ERROR_PERM_DENIED;
            pcap_libdlpi_err(p->opt.source, "dlpi_open", retv,
                p->errbuf);
            return (err);
      }
      p->dlpi_hd = dh;

      if (p->opt.rfmon) {
            /*
             * This device exists, but we don't support monitor mode
             * any platforms that support DLPI.
             */
            err = PCAP_ERROR_RFMON_NOTSUP;
            goto bad;
      }

      /* Bind with DLPI_ANY_SAP. */
      if ((retv = dlpi_bind(p->dlpi_hd, DLPI_ANY_SAP, 0)) != DLPI_SUCCESS) {
            pcap_libdlpi_err(p->opt.source, "dlpi_bind", retv, p->errbuf);
            goto bad;
      }

      /* Enable promiscuous mode. */
      if (p->opt.promisc) {
            retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_PHYS);
            if (retv != DLPI_SUCCESS) {
                  pcap_libdlpi_err(p->opt.source,
                      "dlpi_promisc(PHYSICAL)", retv, p->errbuf);
                  goto bad;
            }
      } else {
            /* Try to enable multicast. */
            retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_MULTI);
            if (retv != DLPI_SUCCESS) {
                  pcap_libdlpi_err(p->opt.source, "dlpi_promisc(MULTI)",
                      retv, p->errbuf);
                  goto bad;
            }
      }

      /* Try to enable SAP promiscuity. */
      if ((retv = dlpi_promiscon(p->dlpi_hd, DL_PROMISC_SAP)) != DLPI_SUCCESS) {
            if (!promisc) {
                  pcap_libdlpi_err(p->opt.source, "dlpi_promisc(SAP)",
                      retv, p->errbuf);
                  goto bad;
            }

            /* Not fatal, since the DL_PROMISC_PHYS mode worked. */
            fprintf(stderr, "WARNING: dlpi_promisc(SAP) failed on"
                " %s:(%s)\n", p->opt.source, dlpi_strerror(retv));
      }

      /* Determine link type.  */
      if ((retv = dlpi_info(p->dlpi_hd, &dlinfo, 0)) != DLPI_SUCCESS) {
            pcap_libdlpi_err(p->opt.source, "dlpi_info", retv, p->errbuf);
            goto bad;
      }

      if (pcap_process_mactype(p, dlinfo.di_mactype) != 0)
            goto bad;

      p->fd = dlpi_fd(p->dlpi_hd);

      /* Push and configure bufmod. */
      if (pcap_conf_bufmod(p, snaplen, p->md.timeout) != 0)
            goto bad;

      /*
       * Flush the read side.
       */
      if (ioctl(p->fd, I_FLUSH, FLUSHR) != 0) {
            snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "FLUSHR: %s",
                pcap_strerror(errno));
            goto bad;
      }

      /* Allocate data buffer. */
      if (pcap_alloc_databuf(p) != 0)
            goto bad;

      /*
       * "p->fd" is a FD for a STREAMS device, so "select()" and
       * "poll()" should work on it.
       */
      p->selectable_fd = p->fd;

      p->read_op = pcap_read_libdlpi;
      p->inject_op = pcap_inject_libdlpi;
      p->setfilter_op = install_bpf_program;    /* No kernel filtering */
      p->setdirection_op = NULL;    /* Not implemented */
      p->set_datalink_op = NULL;    /* Can't change data link type */
      p->getnonblock_op = pcap_getnonblock_fd;
      p->setnonblock_op = pcap_setnonblock_fd;
      p->stats_op = pcap_stats_dlpi;
      p->cleanup_op = pcap_cleanup_libdlpi;

      return (0);
bad:
      pcap_cleanup_libdlpi(p);
      return (err);
}

/*
 * In Solaris, the "standard" mechanism" i.e SIOCGLIFCONF will only find
 * network links that are plumbed and are up. dlpi_walk(3DLPI) will find
 * additional network links present in the system.
 */
int
pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
{
      int retv = 0;

      linknamelist_t    *entry, *next;
      linkwalk_t  lw = {NULL, 0};
      int         save_errno;

      /* dlpi_walk() for loopback will be added here. */

      dlpi_walk(list_interfaces, &lw, 0);

      if (lw.lw_err != 0) {
            snprintf(errbuf, PCAP_ERRBUF_SIZE,
                "dlpi_walk: %s", pcap_strerror(lw.lw_err));
            retv = -1;
            goto done;
      }

      /* Add linkname if it does not exist on the list. */
      for (entry = lw.lw_list; entry != NULL; entry = entry->lnl_next) {
            if (pcap_add_if(alldevsp, entry->linkname, 0, NULL, errbuf) < 0)
                  retv = -1;
      }
done:
      save_errno = errno;
      for (entry = lw.lw_list; entry != NULL; entry = next) {
            next = entry->lnl_next;
            free(entry);
      }
      errno = save_errno;

      return (retv);
}

/*
 * Read data received on DLPI handle. Returns -2 if told to terminate, else
 * returns the number of packets read.
 */
static int
pcap_read_libdlpi(pcap_t *p, int count, pcap_handler callback, u_char *user)
{
      int len;
      u_char *bufp;
      size_t msglen;
      int retv;

      len = p->cc;
      if (len != 0) {
            bufp = p->bp;
            goto process_pkts;
      }
      do {
            /* Has "pcap_breakloop()" been called? */
            if (p->break_loop) {
                  /*
                   * Yes - clear the flag that indicates that it has,
                   * and return -2 to indicate that we were told to
                   * break out of the loop.
                   */
                  p->break_loop = 0;
                  return (-2);
            }

            msglen = p->bufsize;
            bufp = p->buffer + p->offset;

            retv = dlpi_recv(p->dlpi_hd, NULL, NULL, bufp,
                &msglen, -1, NULL);
            if (retv != DLPI_SUCCESS) {
                  /*
                   * This is most likely a call to terminate out of the
                   * loop. So, do not return an error message, instead
                   * check if "pcap_breakloop()" has been called above.
                   */
                  if (retv == DL_SYSERR && errno == EINTR) {
                        len = 0;
                        continue;
                  }
                  pcap_libdlpi_err(dlpi_linkname(p->dlpi_hd),
                      "dlpi_recv", retv, p->errbuf);
                  return (-1);
            }
            len = msglen;
      } while (len == 0);

process_pkts:
      return (pcap_process_pkts(p, callback, user, count, bufp, len));
}

static int
pcap_inject_libdlpi(pcap_t *p, const void *buf, size_t size)
{
      int retv;

      retv = dlpi_send(p->dlpi_hd, NULL, 0, buf, size, NULL);
      if (retv != DLPI_SUCCESS) {
            pcap_libdlpi_err(dlpi_linkname(p->dlpi_hd), "dlpi_send", retv,
                p->errbuf);
            return (-1);
      }
      /*
       * dlpi_send(3DLPI) does not provide a way to return the number of
       * bytes sent on the wire. Based on the fact that DLPI_SUCCESS was
       * returned we are assuming 'size' bytes were sent.
       */
      return (size);
}

/*
 * Close dlpi handle.
 */
static void
pcap_cleanup_libdlpi(pcap_t *p)
{
      if (p->dlpi_hd != NULL) {
            dlpi_close(p->dlpi_hd);
            p->dlpi_hd = NULL;
            p->fd = -1;
      }
      pcap_cleanup_live_common(p);
}

/*
 * Write error message to buffer.
 */
static void
pcap_libdlpi_err(const char *linkname, const char *func, int err, char *errbuf)
{
      snprintf(errbuf, PCAP_ERRBUF_SIZE, "libpcap: %s failed on %s: %s",
          func, linkname, dlpi_strerror(err));
}

pcap_t *
pcap_create(const char *device, char *ebuf)
{
      pcap_t *p;

      p = pcap_create_common(device, ebuf);
      if (p == NULL)
            return (NULL);

      p->activate_op = pcap_activate_libdlpi;
      return (p);
}

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