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pcap-dlpi.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 Atanu Ghosh (atanu@cs.ucl.ac.uk),
 * University College London, and subsequently modified by
 * Guy Harris (guy@alum.mit.edu), Mark Pizzolato
 * <List-tcpdump-workers@subscriptions.pizzolato.net>,
 * and Mark C. Brown (mbrown@hp.com).
 */

/*
 * Packet capture routine for DLPI under SunOS 5, HP-UX 9/10/11, and AIX.
 *
 * Notes:
 *
 *    - The DLIOCRAW ioctl() is specific to SunOS.
 *
 *    - There is a bug in bufmod(7) such that setting the snapshot
 *      length results in data being left of the front of the packet.
 *
 *    - It might be desirable to use pfmod(7) to filter packets in the
 *      kernel when possible.
 *
 *    - An older version of the HP-UX DLPI Programmer's Guide, which
 *      I think was advertised as the 10.20 version, used to be available
 *      at
 *
 *            http://docs.hp.com/hpux/onlinedocs/B2355-90093/B2355-90093.html
 *
 *      but is no longer available; it can still be found at
 *
 *            http://h21007.www2.hp.com/dspp/files/unprotected/Drivers/Docs/Refs/B2355-90093.pdf
 *
 *      in PDF form.
 *
 *    - The HP-UX 10.x, 11.0, and 11i v1.6 version of the HP-UX DLPI
 *      Programmer's Guide, which I think was once advertised as the
 *      11.00 version is available at
 *
 *            http://docs.hp.com/en/B2355-90139/index.html
 *
 *    - The HP-UX 11i v2 version of the HP-UX DLPI Programmer's Guide
 *      is available at
 *
 *            http://docs.hp.com/en/B2355-90871/index.html
 *
 *    - All of the HP documents describe raw-mode services, which are
 *      what we use if DL_HP_RAWDLS is defined.  XXX - we use __hpux
 *      in some places to test for HP-UX, but use DL_HP_RAWDLS in
 *      other places; do we support any versions of HP-UX without
 *      DL_HP_RAWDLS?
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/libpcap/pcap-dlpi.c,v 1.108.2.7 2006/04/04 05:33:02 guy Exp $ (LBL)";
#endif

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

#include <sys/types.h>
#include <sys/time.h>
#ifdef HAVE_SYS_BUFMOD_H
#include <sys/bufmod.h>
#endif
#include <sys/dlpi.h>
#ifdef HAVE_SYS_DLPI_EXT_H
#include <sys/dlpi_ext.h>
#endif
#ifdef HAVE_HPUX9
#include <sys/socket.h>
#endif
#ifdef DL_HP_PPA_REQ
#include <sys/stat.h>
#endif
#include <sys/stream.h>
#if defined(HAVE_SOLARIS) && defined(HAVE_SYS_BUFMOD_H)
#include <sys/systeminfo.h>
#endif

#ifdef HAVE_HPUX9
#include <net/if.h>
#endif

#include <ctype.h>
#ifdef HAVE_HPUX9
#include <nlist.h>
#endif
#include <errno.h>
#include <fcntl.h>
#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stropts.h>
#include <unistd.h>

#ifdef HAVE_LIMITS_H
#include <limits.h>
#else
#define INT_MAX         2147483647
#endif

#include "pcap-int.h"

#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif

#ifndef PCAP_DEV_PREFIX
#ifdef _AIX
#define PCAP_DEV_PREFIX "/dev/dlpi"
#else
#define PCAP_DEV_PREFIX "/dev"
#endif
#endif

#define     MAXDLBUF    8192

#ifdef HAVE_SYS_BUFMOD_H

/*
 * Size of a bufmod chunk to pass upstream; that appears to be the biggest
 * value to which you can set it, and setting it to that value (which
 * is bigger than what appears to be the Solaris default of 8192)
 * reduces the number of packet drops.
 */
#define CHUNKSIZE 65536

/*
 * Size of the buffer to allocate for packet data we read; it must be
 * large enough to hold a chunk.
 */
#define PKTBUFSIZE      CHUNKSIZE

#else /* HAVE_SYS_BUFMOD_H */

/*
 * Size of the buffer to allocate for packet data we read; this is
 * what the value used to be - there's no particular reason why it
 * should be tied to MAXDLBUF, but we'll leave it as this for now.
 */
#define PKTBUFSIZE      (MAXDLBUF * sizeof(bpf_u_int32))

#endif

/* Forwards */
static char *split_dname(char *, int *, char *);
static int dl_doattach(int, int, char *);
#ifdef DL_HP_RAWDLS
static int dl_dohpuxbind(int, char *);
#endif
static int dlattachreq(int, bpf_u_int32, char *);
static int dlbindreq(int, bpf_u_int32, char *);
static int dlbindack(int, char *, char *, int *);
static int dlpromisconreq(int, bpf_u_int32, char *);
static int dlokack(int, const char *, char *, char *);
static int dlinforeq(int, char *);
static int dlinfoack(int, char *, char *);
#ifdef DL_HP_RAWDLS
static int dlrawdatareq(int, const u_char *, int);
#endif
static int recv_ack(int, int, const char *, char *, char *, int *);
static char *dlstrerror(bpf_u_int32);
static char *dlprim(bpf_u_int32);
#if defined(HAVE_SOLARIS) && defined(HAVE_SYS_BUFMOD_H)
static char *get_release(bpf_u_int32 *, bpf_u_int32 *, bpf_u_int32 *);
#endif
static int send_request(int, char *, int, char *, char *);
#ifdef HAVE_SYS_BUFMOD_H
static int strioctl(int, int, int, char *);
#endif
#ifdef HAVE_HPUX9
static int dlpi_kread(int, off_t, void *, u_int, char *);
#endif
#ifdef HAVE_DEV_DLPI
static int get_dlpi_ppa(int, const char *, int, char *);
#endif

static int
pcap_stats_dlpi(pcap_t *p, struct pcap_stat *ps)
{

      /*
       * "ps_recv" counts packets handed to the filter, not packets
       * that passed the filter.  As filtering is done in userland,
       * this would not include packets dropped because we ran out
       * of buffer space; in order to make this more like other
       * platforms (Linux 2.4 and later, BSDs with BPF), where the
       * "packets received" count includes packets received but dropped
       * due to running out of buffer space, and to keep from confusing
       * applications that, for example, compute packet drop percentages,
       * we also make it count packets dropped by "bufmod" (otherwise we
       * might run the risk of the packet drop count being bigger than
       * the received-packet count).
       *
       * "ps_drop" counts packets dropped by "bufmod" because of
       * flow control requirements or resource exhaustion; it doesn't
       * count packets dropped by the interface driver, or packets
       * dropped upstream.  As filtering is done in userland, it counts
       * packets regardless of whether they would've passed the filter.
       *
       * These statistics don't include packets not yet read from
       * the kernel by libpcap, but they may include packets not
       * yet read from libpcap by the application.
       */
      *ps = p->md.stat;

      /*
       * Add in the drop count, as per the above comment.
       */
      ps->ps_recv += ps->ps_drop;
      return (0);
}

/* XXX Needed by HP-UX (at least) */
static bpf_u_int32 ctlbuf[MAXDLBUF];
static struct strbuf ctl = {
      MAXDLBUF,
      0,
      (char *)ctlbuf
};

static int
pcap_read_dlpi(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
      register int cc, n, caplen, origlen;
      register u_char *bp, *ep, *pk;
      register struct bpf_insn *fcode;
#ifdef HAVE_SYS_BUFMOD_H
      register struct sb_hdr *sbp;
#ifdef LBL_ALIGN
      struct sb_hdr sbhdr;
#endif
#endif
      int flags;
      struct strbuf data;
      struct pcap_pkthdr pkthdr;

      flags = 0;
      cc = p->cc;
      if (cc == 0) {
            data.buf = (char *)p->buffer + p->offset;
            data.maxlen = p->bufsize;
            data.len = 0;
            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);
                  }
                  /*
                   * XXX - check for the DLPI primitive, which
                   * would be DL_HP_RAWDATA_IND on HP-UX
                   * if we're in raw mode?
                   */
                  if (getmsg(p->fd, &ctl, &data, &flags) < 0) {
                        /* Don't choke when we get ptraced */
                        switch (errno) {

                        case EINTR:
                              cc = 0;
                              continue;

                        case EAGAIN:
                              return (0);
                        }
                        strlcpy(p->errbuf, pcap_strerror(errno),
                            sizeof(p->errbuf));
                        return (-1);
                  }
                  cc = data.len;
            } while (cc == 0);
            bp = p->buffer + p->offset;
      } else
            bp = p->bp;

      /* Loop through packets */
      fcode = p->fcode.bf_insns;
      ep = bp + cc;
      n = 0;
#ifdef HAVE_SYS_BUFMOD_H
      while (bp < ep) {
            /*
             * Has "pcap_breakloop()" been called?
             * If so, return immediately - if we haven't read any
             * packets, clear the flag and return -2 to indicate
             * that we were told to break out of the loop, otherwise
             * leave the flag set, so that the *next* call will break
             * out of the loop without having read any packets, and
             * return the number of packets we've processed so far.
             */
            if (p->break_loop) {
                  if (n == 0) {
                        p->break_loop = 0;
                        return (-2);
                  } else {
                        p->bp = bp;
                        p->cc = ep - bp;
                        return (n);
                  }
            }
#ifdef LBL_ALIGN
            if ((long)bp & 3) {
                  sbp = &sbhdr;
                  memcpy(sbp, bp, sizeof(*sbp));
            } else
#endif
                  sbp = (struct sb_hdr *)bp;
            p->md.stat.ps_drop = sbp->sbh_drops;
            pk = bp + sizeof(*sbp);
            bp += sbp->sbh_totlen;
            origlen = sbp->sbh_origlen;
            caplen = sbp->sbh_msglen;
#else
            origlen = cc;
            caplen = min(p->snapshot, cc);
            pk = bp;
            bp += caplen;
#endif
            ++p->md.stat.ps_recv;
            if (bpf_filter(fcode, pk, origlen, caplen)) {
#ifdef HAVE_SYS_BUFMOD_H
                  pkthdr.ts.tv_sec = sbp->sbh_timestamp.tv_sec;
                  pkthdr.ts.tv_usec = sbp->sbh_timestamp.tv_usec;
#else
                  (void)gettimeofday(&pkthdr.ts, NULL);
#endif
                  pkthdr.len = origlen;
                  pkthdr.caplen = caplen;
                  /* Insure caplen does not exceed snapshot */
                  if (pkthdr.caplen > p->snapshot)
                        pkthdr.caplen = p->snapshot;
                  (*callback)(user, &pkthdr, pk);
                  if (++n >= cnt && cnt >= 0) {
                        p->cc = ep - bp;
                        p->bp = bp;
                        return (n);
                  }
            }
#ifdef HAVE_SYS_BUFMOD_H
      }
#endif
      p->cc = 0;
      return (n);
}

static int
pcap_inject_dlpi(pcap_t *p, const void *buf, size_t size)
{
      int ret;

#if defined(DLIOCRAW)
      ret = write(p->fd, buf, size);
      if (ret == -1) {
            snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
                pcap_strerror(errno));
            return (-1);
      }
#elif defined(DL_HP_RAWDLS)
      if (p->send_fd < 0) {
            snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
                "send: Output FD couldn't be opened");
            return (-1);
      }
      ret = dlrawdatareq(p->send_fd, buf, size);
      if (ret == -1) {
            snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
                pcap_strerror(errno));
            return (-1);
      }
      /*
       * putmsg() returns either 0 or -1; it doesn't indicate how
       * many bytes were written (presumably they were all written
       * or none of them were written).  OpenBSD's pcap_inject()
       * returns the number of bytes written, so, for API compatibility,
       * we return the number of bytes we were told to write.
       */
      ret = size;
#else /* no raw mode */
      /*
       * XXX - this is a pain, because you might have to extract
       * the address from the packet and use it in a DL_UNITDATA_REQ
       * request.  That would be dependent on the link-layer type.
       *
       * I also don't know what SAP you'd have to bind the descriptor
       * to, or whether you'd need separate "receive" and "send" FDs,
       * nor do I know whether you'd need different bindings for
       * D/I/X Ethernet and 802.3, or for {FDDI,Token Ring} plus
       * 802.2 and {FDDI,Token Ring} plus 802.2 plus SNAP.
       *
       * So, for now, we just return a "you can't send" indication,
       * and leave it up to somebody with a DLPI-based system lacking
       * both DLIOCRAW and DL_HP_RAWDLS to supply code to implement
       * packet transmission on that system.  If they do, they should
       * send it to us - but should not send us code that assumes
       * Ethernet; if the code doesn't work on non-Ethernet interfaces,
       * it should check "p->linktype" and reject the send request if
       * it's anything other than DLT_EN10MB.
       */
      strlcpy(p->errbuf, "send: Not supported on this version of this OS",
          PCAP_ERRBUF_SIZE);
      ret = -1;
#endif /* raw mode */
      return (ret);
}   

#ifndef DL_IPATM
#define DL_IPATM  0x12  /* ATM Classical IP interface */
#endif

#ifdef HAVE_SOLARIS
/*
 * For SunATM.
 */
#ifndef A_GET_UNITS
#define A_GET_UNITS     (('A'<<8)|118)
#endif /* A_GET_UNITS */
#ifndef A_PROMISCON_REQ
#define A_PROMISCON_REQ (('A'<<8)|121)
#endif /* A_PROMISCON_REQ */
#endif /* HAVE_SOLARIS */

static void
pcap_close_dlpi(pcap_t *p)
{
      pcap_close_common(p);
      if (p->send_fd >= 0)
            close(p->send_fd);
}

pcap_t *
pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
    char *ebuf)
{
      register char *cp;
      register pcap_t *p;
      int ppa;
#ifdef HAVE_SOLARIS
      int isatm = 0;
#endif
      register dl_info_ack_t *infop;
#ifdef HAVE_SYS_BUFMOD_H
      bpf_u_int32 ss, chunksize;
#ifdef HAVE_SOLARIS
      register char *release;
      bpf_u_int32 osmajor, osminor, osmicro;
#endif
#endif
      bpf_u_int32 buf[MAXDLBUF];
      char dname[100];
#ifndef HAVE_DEV_DLPI
      char dname2[100];
#endif

      p = (pcap_t *)malloc(sizeof(*p));
      if (p == NULL) {
            strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
            return (NULL);
      }
      memset(p, 0, sizeof(*p));
      p->fd = -1; /* indicate that it hasn't been opened yet */
      p->send_fd = -1;

#ifdef HAVE_DEV_DLPI
      /*
      ** Remove any "/dev/" on the front of the device.
      */
      cp = strrchr(device, '/');
      if (cp == NULL)
            strlcpy(dname, device, sizeof(dname));
      else
            strlcpy(dname, cp + 1, sizeof(dname));

      /*
       * Split the device name into a device type name and a unit number;
       * chop off the unit number, so "dname" is just a device type name.
       */
      cp = split_dname(dname, &ppa, ebuf);
      if (cp == NULL)
            goto bad;
      *cp = '\0';

      /*
       * Use "/dev/dlpi" as the device.
       *
       * XXX - HP's DLPI Programmer's Guide for HP-UX 11.00 says that
       * the "dl_mjr_num" field is for the "major number of interface
       * driver"; that's the major of "/dev/dlpi" on the system on
       * which I tried this, but there may be DLPI devices that
       * use a different driver, in which case we may need to
       * search "/dev" for the appropriate device with that major
       * device number, rather than hardwiring "/dev/dlpi".
       */
      cp = "/dev/dlpi";
      if ((p->fd = open(cp, O_RDWR)) < 0) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE,
                "%s: %s", cp, pcap_strerror(errno));
            goto bad;
      }

#ifdef DL_HP_RAWDLS
      /*
       * XXX - HP-UX 10.20 and 11.xx don't appear to support sending and
       * receiving packets on the same descriptor - you need separate
       * descriptors for sending and receiving, bound to different SAPs.
       *
       * If the open fails, we just leave -1 in "p->send_fd" and reject
       * attempts to send packets, just as if, in pcap-bpf.c, we fail
       * to open the BPF device for reading and writing, we just try
       * to open it for reading only and, if that succeeds, just let
       * the send attempts fail.
       */
      p->send_fd = open(cp, O_RDWR);
#endif

      /*
       * Get a table of all PPAs for that device, and search that
       * table for the specified device type name and unit number.
       */
      ppa = get_dlpi_ppa(p->fd, dname, ppa, ebuf);
      if (ppa < 0)
            goto bad;
#else
      /*
       * If the device name begins with "/", assume it begins with
       * the pathname of the directory containing the device to open;
       * otherwise, concatenate the device directory name and the
       * device name.
       */
      if (*device == '/')
            strlcpy(dname, device, sizeof(dname));
      else
            snprintf(dname, sizeof(dname), "%s/%s", PCAP_DEV_PREFIX,
                device);

      /*
       * Get the unit number, and a pointer to the end of the device
       * type name.
       */
      cp = split_dname(dname, &ppa, ebuf);
      if (cp == NULL)
            goto bad;

      /*
       * Make a copy of the device pathname, and then remove the unit
       * number from the device pathname.
       */
      strlcpy(dname2, dname, sizeof(dname));
      *cp = '\0';

      /* Try device without unit number */
      if ((p->fd = open(dname, O_RDWR)) < 0) {
            if (errno != ENOENT) {
                  snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s: %s", dname,
                      pcap_strerror(errno));
                  goto bad;
            }

            /* Try again with unit number */
            if ((p->fd = open(dname2, O_RDWR)) < 0) {
                  if (errno == ENOENT) {
                        /*
                         * We just report "No DLPI device found"
                         * with the device name, so people don't
                         * get confused and think, for example,
                         * that if they can't capture on "lo0"
                         * on Solaris the fix is to change libpcap
                         * (or the application that uses it) to
                         * look for something other than "/dev/lo0",
                         * as the fix is to look for an operating
                         * system other than Solaris - you just
                         * *can't* capture on a loopback interface
                         * on Solaris, the lack of a DLPI device
                         * for the loopback interface is just a
                         * symptom of that inability.
                         */
                        snprintf(ebuf, PCAP_ERRBUF_SIZE,
                            "%s: No DLPI device found", device);
                  } else {
                        snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s: %s",
                            dname2, pcap_strerror(errno));
                  }
                  goto bad;
            }
            /* XXX Assume unit zero */
            ppa = 0;
      }
#endif

      p->snapshot = snaplen;

      /*
      ** Attach if "style 2" provider
      */
      if (dlinforeq(p->fd, ebuf) < 0 ||
          dlinfoack(p->fd, (char *)buf, ebuf) < 0)
            goto bad;
      infop = &((union DL_primitives *)buf)->info_ack;
#ifdef HAVE_SOLARIS
      if (infop->dl_mac_type == DL_IPATM)
            isatm = 1;
#endif
      if (infop->dl_provider_style == DL_STYLE2) {
            if (dl_doattach(p->fd, ppa, ebuf) < 0)
                  goto bad;
#ifdef DL_HP_RAWDLS
            if (p->send_fd >= 0) {
                  if (dl_doattach(p->send_fd, ppa, ebuf) < 0)
                        goto bad;
            }
#endif
      }

      /*
      ** Bind (defer if using HP-UX 9 or HP-UX 10.20 or later, totally
      ** skip if using SINIX)
      */
#if !defined(HAVE_HPUX9) && !defined(HAVE_HPUX10_20_OR_LATER) && !defined(sinix)
#ifdef _AIX
      /*
      ** AIX.
      ** According to IBM's AIX Support Line, the dl_sap value
      ** should not be less than 0x600 (1536) for standard Ethernet.
      ** However, we seem to get DL_BADADDR - "DLSAP addr in improper
      ** format or invalid" - errors if we use 1537 on the "tr0"
      ** device, which, given that its name starts with "tr" and that
      ** it's IBM, probably means a Token Ring device.  (Perhaps we
      ** need to use 1537 on "/dev/dlpi/en" because that device is for
      ** D/I/X Ethernet, the "SAP" is actually an Ethernet type, and
      ** it rejects invalid Ethernet types.)
      **
      ** So if 1537 fails, we try 2, as Hyung Sik Yoon of IBM Korea
      ** says that works on Token Ring (he says that 0 does *not*
      ** work; perhaps that's considered an invalid LLC SAP value - I
      ** assume the SAP value in a DLPI bind is an LLC SAP for network
      ** types that use 802.2 LLC).
      */
      if ((dlbindreq(p->fd, 1537, ebuf) < 0 &&
           dlbindreq(p->fd, 2, ebuf) < 0) ||
           dlbindack(p->fd, (char *)buf, ebuf, NULL) < 0)
            goto bad;
#elif defined(DL_HP_RAWDLS)
      /*
      ** HP-UX 10.0x and 10.1x.
      */
      if (dl_dohpuxbind(p->fd, ebuf) < 0)
            goto bad;
      if (p->send_fd >= 0) {
            /*
            ** XXX - if this fails, just close send_fd and
            ** set it to -1, so that you can't send but can
            ** still receive?
            */
            if (dl_dohpuxbind(p->send_fd, ebuf) < 0)
                  goto bad;
      }
#else /* neither AIX nor HP-UX */
      /*
      ** Not Sinix, and neither AIX nor HP-UX - Solaris, and any other
      ** OS using DLPI.
      **/
      if (dlbindreq(p->fd, 0, ebuf) < 0 ||
          dlbindack(p->fd, (char *)buf, ebuf, NULL) < 0)
            goto bad;
#endif /* AIX vs. HP-UX vs. other */
#endif /* !HP-UX 9 and !HP-UX 10.20 or later and !SINIX */

#ifdef HAVE_SOLARIS
      if (isatm) {
            /*
            ** Have to turn on some special ATM promiscuous mode
            ** for SunATM.
            ** Do *NOT* turn regular promiscuous mode on; it doesn't
            ** help, and may break things.
            */
            if (strioctl(p->fd, A_PROMISCON_REQ, 0, NULL) < 0) {
                  snprintf(ebuf, PCAP_ERRBUF_SIZE, "A_PROMISCON_REQ: %s",
                      pcap_strerror(errno));
                  goto bad;
            }
      } else
#endif
      if (promisc) {
            /*
            ** Enable promiscuous (not necessary on send FD)
            */
            if (dlpromisconreq(p->fd, DL_PROMISC_PHYS, ebuf) < 0 ||
                dlokack(p->fd, "promisc_phys", (char *)buf, ebuf) < 0)
                  goto bad;

            /*
            ** Try to enable multicast (you would have thought
            ** promiscuous would be sufficient). (Skip if using
            ** HP-UX or SINIX) (Not necessary on send FD)
            */
#if !defined(__hpux) && !defined(sinix)
            if (dlpromisconreq(p->fd, DL_PROMISC_MULTI, ebuf) < 0 ||
                dlokack(p->fd, "promisc_multi", (char *)buf, ebuf) < 0)
                  fprintf(stderr,
                      "WARNING: DL_PROMISC_MULTI failed (%s)\n", ebuf);
#endif
      }
      /*
      ** Try to enable SAP promiscuity (when not in promiscuous mode
      ** when using HP-UX, when not doing SunATM on Solaris, and never
      ** under SINIX) (Not necessary on send FD)
      */
#ifndef sinix
      if (
#ifdef __hpux
          !promisc &&
#endif
#ifdef HAVE_SOLARIS
          !isatm &&
#endif
          (dlpromisconreq(p->fd, DL_PROMISC_SAP, ebuf) < 0 ||
          dlokack(p->fd, "promisc_sap", (char *)buf, ebuf) < 0)) {
            /* Not fatal if promisc since the DL_PROMISC_PHYS worked */
            if (promisc)
                  fprintf(stderr,
                      "WARNING: DL_PROMISC_SAP failed (%s)\n", ebuf);
            else
                  goto bad;
      }
#endif /* sinix */

      /*
      ** HP-UX 9, and HP-UX 10.20 or later, must bind after setting
      ** promiscuous options.
      */
#if defined(HAVE_HPUX9) || defined(HAVE_HPUX10_20_OR_LATER)
      if (dl_dohpuxbind(p->fd, ebuf) < 0)
            goto bad;
      /*
      ** We don't set promiscuous mode on the send FD, but we'll defer
      ** binding it anyway, just to keep the HP-UX 9/10.20 or later
      ** code together.
      */
      if (p->send_fd >= 0) {
            /*
            ** XXX - if this fails, just close send_fd and
            ** set it to -1, so that you can't send but can
            ** still receive?
            */
            if (dl_dohpuxbind(p->send_fd, ebuf) < 0)
                  goto bad;
      }
#endif

      /*
      ** Determine link type
      ** XXX - get SAP length and address length as well, for use
      ** when sending packets.
      */
      if (dlinforeq(p->fd, ebuf) < 0 ||
          dlinfoack(p->fd, (char *)buf, ebuf) < 0)
            goto bad;

      infop = &((union DL_primitives *)buf)->info_ack;
      switch (infop->dl_mac_type) {

      case DL_CSMACD:
      case DL_ETHER:
            p->linktype = DLT_EN10MB;
            p->offset = 2;
            /*
             * This is (presumably) a real Ethernet capture; give it a
             * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
             * that an application can let you choose it, in case you're
             * capturing DOCSIS traffic that a Cisco Cable Modem
             * Termination System is putting out onto an Ethernet (it
             * doesn't put an Ethernet header onto the wire, it puts raw
             * DOCSIS frames out on the wire inside the low-level
             * Ethernet framing).
             */
            p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
            /*
             * If that fails, just leave the list empty.
             */
            if (p->dlt_list != NULL) {
                  p->dlt_list[0] = DLT_EN10MB;
                  p->dlt_list[1] = DLT_DOCSIS;
                  p->dlt_count = 2;
            }
            break;

      case DL_FDDI:
            p->linktype = DLT_FDDI;
            p->offset = 3;
            break;

      case DL_TPR:
            /*
             * XXX - what about DL_TPB?  Is that Token Bus?
             */   
            p->linktype = DLT_IEEE802;
            p->offset = 2;
            break;

#ifdef HAVE_SOLARIS
      case DL_IPATM:
            p->linktype = DLT_SUNATM;
            p->offset = 0;    /* works for LANE and LLC encapsulation */
            break;
#endif

      default:
            snprintf(ebuf, PCAP_ERRBUF_SIZE, "unknown mac type %lu",
                (unsigned long)infop->dl_mac_type);
            goto bad;
      }

#ifdef      DLIOCRAW
      /*
      ** This is a non standard SunOS hack to get the full raw link-layer
      ** header.
      */
      if (strioctl(p->fd, DLIOCRAW, 0, NULL) < 0) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE, "DLIOCRAW: %s",
                pcap_strerror(errno));
            goto bad;
      }
#endif

#ifdef HAVE_SYS_BUFMOD_H
      /*
      ** Another non standard call to get the data nicely buffered
      */
      if (ioctl(p->fd, I_PUSH, "bufmod") != 0) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE, "I_PUSH bufmod: %s",
                pcap_strerror(errno));
            goto bad;
      }

      /*
      ** Now that the bufmod is pushed lets configure it.
      **
      ** There is a bug in bufmod(7). When dealing with messages of
      ** less than snaplen size it strips data from the beginning not
      ** the end.
      **
      ** This bug is supposed to be fixed in 5.3.2. Also, there is a
      ** patch available. Ask for bugid 1149065.
      */
      ss = snaplen;
#ifdef HAVE_SOLARIS
      release = get_release(&osmajor, &osminor, &osmicro);
      if (osmajor == 5 && (osminor <= 2 || (osminor == 3 && osmicro < 2)) &&
          getenv("BUFMOD_FIXED") == NULL) {
            fprintf(stderr,
            "WARNING: bufmod is broken in SunOS %s; ignoring snaplen.\n",
                release);
            ss = 0;
      }
#endif
      if (ss > 0 &&
          strioctl(p->fd, SBIOCSSNAP, sizeof(ss), (char *)&ss) != 0) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE, "SBIOCSSNAP: %s",
                pcap_strerror(errno));
            goto bad;
      }

      /*
      ** Set up the bufmod timeout
      */
      if (to_ms != 0) {
            struct timeval to;

            to.tv_sec = to_ms / 1000;
            to.tv_usec = (to_ms * 1000) % 1000000;
            if (strioctl(p->fd, SBIOCSTIME, sizeof(to), (char *)&to) != 0) {
                  snprintf(ebuf, PCAP_ERRBUF_SIZE, "SBIOCSTIME: %s",
                      pcap_strerror(errno));
                  goto bad;
            }
      }
#endif

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

      /* Allocate data buffer */
      p->bufsize = PKTBUFSIZE;
      p->buffer = (u_char *)malloc(p->bufsize + p->offset);
      if (p->buffer == NULL) {
            strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
            goto bad;
      }

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

      p->read_op = pcap_read_dlpi;
      p->inject_op = pcap_inject_dlpi;
      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->close_op = pcap_close_dlpi;

      return (p);
bad:
      if (p->fd >= 0)
            close(p->fd);
      if (p->send_fd >= 0)
            close(p->send_fd);
      /*
       * Get rid of any link-layer type list we allocated.
       */
      if (p->dlt_list != NULL)
            free(p->dlt_list);
      free(p);
      return (NULL);
}

/*
 * Split a device name into a device type name and a unit number;
 * return the a pointer to the beginning of the unit number, which
 * is the end of the device type name, and set "*unitp" to the unit
 * number.
 *
 * Returns NULL on error, and fills "ebuf" with an error message.
 */
static char *
split_dname(char *device, int *unitp, char *ebuf)
{
      char *cp;
      char *eos;
      long unit;

      /*
       * Look for a number at the end of the device name string.
       */
      cp = device + strlen(device) - 1;
      if (*cp < '0' || *cp > '9') {
            snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s missing unit number",
                device);
            return (NULL);
      }

      /* Digits at end of string are unit number */
      while (cp-1 >= device && *(cp-1) >= '0' && *(cp-1) <= '9')
            cp--;

      errno = 0;
      unit = strtol(cp, &eos, 10);
      if (*eos != '\0') {
            snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s bad unit number", device);
            return (NULL);
      }
      if (errno == ERANGE || unit > INT_MAX) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s unit number too large",
                device);
            return (NULL);
      }
      if (unit < 0) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s unit number is negative",
                device);
            return (NULL);
      }
      *unitp = (int)unit;
      return (cp);
}

static int
dl_doattach(int fd, int ppa, char *ebuf)
{
      bpf_u_int32 buf[MAXDLBUF];

      if (dlattachreq(fd, ppa, ebuf) < 0 ||
          dlokack(fd, "attach", (char *)buf, ebuf) < 0)
            return (-1);
      return (0);
}

#ifdef DL_HP_RAWDLS
static int
dl_dohpuxbind(int fd, char *ebuf)
{
      int hpsap;
      int uerror;
      bpf_u_int32 buf[MAXDLBUF];

      /*
       * XXX - we start at 22 because we used to use only 22, but
       * that was just because that was the value used in some
       * sample code from HP.  With what value *should* we start?
       * Does it matter, given that we're enabling SAP promiscuity
       * on the input FD?
       */
      hpsap = 22;
      for (;;) {
            if (dlbindreq(fd, hpsap, ebuf) < 0)
                  return (-1);
            if (dlbindack(fd, (char *)buf, ebuf, &uerror) >= 0)
                  break;
            /*
             * For any error other than a UNIX EBUSY, give up.
             */
            if (uerror != EBUSY) {
                  /*
                   * dlbindack() has already filled in ebuf for
                   * this error.
                   */
                  return (-1);
            }

            /*
             * For EBUSY, try the next SAP value; that means that
             * somebody else is using that SAP.  Clear ebuf so
             * that application doesn't report the "Device busy"
             * error as a warning.
             */
            *ebuf = '\0';
            hpsap++;
            if (hpsap > 100) {
                  strlcpy(ebuf,
                      "All SAPs from 22 through 100 are in use",
                      PCAP_ERRBUF_SIZE);
                  return (-1);
            }
      }
      return (0);
}
#endif

int
pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
{
#ifdef HAVE_SOLARIS
      int fd;
      union {
            u_int nunits;
            char pad[516];    /* XXX - must be at least 513; is 516
                           in "atmgetunits" */
      } buf;
      char baname[2+1+1];
      u_int i;

      /*
       * We may have to do special magic to get ATM devices.
       */
      if ((fd = open("/dev/ba", O_RDWR)) < 0) {
            /*
             * We couldn't open the "ba" device.
             * For now, just give up; perhaps we should
             * return an error if the problem is neither
             * a "that device doesn't exist" error (ENOENT,
             * ENXIO, etc.) or a "you're not allowed to do
             * that" error (EPERM, EACCES).
             */
            return (0);
      }

      if (strioctl(fd, A_GET_UNITS, sizeof(buf), (char *)&buf) < 0) {
            snprintf(errbuf, PCAP_ERRBUF_SIZE, "A_GET_UNITS: %s",
                pcap_strerror(errno));
            return (-1);
      }
      for (i = 0; i < buf.nunits; i++) {
            snprintf(baname, sizeof baname, "ba%u", i);
            if (pcap_add_if(alldevsp, baname, 0, NULL, errbuf) < 0)
                  return (-1);
      }
#endif

      return (0);
}

static int
send_request(int fd, char *ptr, int len, char *what, char *ebuf)
{
      struct      strbuf      ctl;
      int   flags;

      ctl.maxlen = 0;
      ctl.len = len;
      ctl.buf = ptr;

      flags = 0;
      if (putmsg(fd, &ctl, (struct strbuf *) NULL, flags) < 0) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE,
                "send_request: putmsg \"%s\": %s",
                what, pcap_strerror(errno));
            return (-1);
      }
      return (0);
}

static int
recv_ack(int fd, int size, const char *what, char *bufp, char *ebuf, int *uerror)
{
      union DL_primitives     *dlp;
      struct      strbuf      ctl;
      int   flags;

      /*
       * Clear out "*uerror", so it's only set for DL_ERROR_ACK/DL_SYSERR,
       * making that the only place where EBUSY is treated specially.
       */
      if (uerror != NULL)
            *uerror = 0;

      ctl.maxlen = MAXDLBUF;
      ctl.len = 0;
      ctl.buf = bufp;

      flags = 0;
      if (getmsg(fd, &ctl, (struct strbuf*)NULL, &flags) < 0) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE, "recv_ack: %s getmsg: %s",
                what, pcap_strerror(errno));
            return (-1);
      }

      dlp = (union DL_primitives *) ctl.buf;
      switch (dlp->dl_primitive) {

      case DL_INFO_ACK:
      case DL_BIND_ACK:
      case DL_OK_ACK:
#ifdef DL_HP_PPA_ACK
      case DL_HP_PPA_ACK:
#endif
            /* These are OK */
            break;

      case DL_ERROR_ACK:
            switch (dlp->error_ack.dl_errno) {

            case DL_SYSERR:
                  if (uerror != NULL)
                        *uerror = dlp->error_ack.dl_unix_errno;
                  snprintf(ebuf, PCAP_ERRBUF_SIZE,
                      "recv_ack: %s: UNIX error - %s",
                      what, pcap_strerror(dlp->error_ack.dl_unix_errno));
                  break;

            default:
                  snprintf(ebuf, PCAP_ERRBUF_SIZE, "recv_ack: %s: %s",
                      what, dlstrerror(dlp->error_ack.dl_errno));
                  break;
            }
            return (-1);

      default:
            snprintf(ebuf, PCAP_ERRBUF_SIZE,
                "recv_ack: %s: Unexpected primitive ack %s",
                what, dlprim(dlp->dl_primitive));
            return (-1);
      }

      if (ctl.len < size) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE,
                "recv_ack: %s: Ack too small (%d < %d)",
                what, ctl.len, size);
            return (-1);
      }
      return (ctl.len);
}

static char *
dlstrerror(bpf_u_int32 dl_errno)
{
      static char errstring[6+2+8+1];

      switch (dl_errno) {

      case DL_ACCESS:
            return ("Improper permissions for request");

      case DL_BADADDR:
            return ("DLSAP addr in improper format or invalid");

      case DL_BADCORR:
            return ("Seq number not from outstand DL_CONN_IND");

      case DL_BADDATA:
            return ("User data exceeded provider limit");

      case DL_BADPPA:
#ifdef HAVE_DEV_DLPI
            /*
             * With a single "/dev/dlpi" device used for all
             * DLPI providers, PPAs have nothing to do with
             * unit numbers.
             */
            return ("Specified PPA was invalid");
#else
            /*
             * We have separate devices for separate devices;
             * the PPA is just the unit number.
             */
            return ("Specified PPA (device unit) was invalid");
#endif

      case DL_BADPRIM:
            return ("Primitive received not known by provider");

      case DL_BADQOSPARAM:
            return ("QOS parameters contained invalid values");

      case DL_BADQOSTYPE:
            return ("QOS structure type is unknown/unsupported");

      case DL_BADSAP:
            return ("Bad LSAP selector");

      case DL_BADTOKEN:
            return ("Token used not an active stream");

      case DL_BOUND:
            return ("Attempted second bind with dl_max_conind");

      case DL_INITFAILED:
            return ("Physical link initialization failed");

      case DL_NOADDR:
            return ("Provider couldn't allocate alternate address");

      case DL_NOTINIT:
            return ("Physical link not initialized");

      case DL_OUTSTATE:
            return ("Primitive issued in improper state");

      case DL_SYSERR:
            return ("UNIX system error occurred");

      case DL_UNSUPPORTED:
            return ("Requested service not supplied by provider");

      case DL_UNDELIVERABLE:
            return ("Previous data unit could not be delivered");

      case DL_NOTSUPPORTED:
            return ("Primitive is known but not supported");

      case DL_TOOMANY:
            return ("Limit exceeded");

      case DL_NOTENAB:
            return ("Promiscuous mode not enabled");

      case DL_BUSY:
            return ("Other streams for PPA in post-attached");

      case DL_NOAUTO:
            return ("Automatic handling XID&TEST not supported");

      case DL_NOXIDAUTO:
            return ("Automatic handling of XID not supported");

      case DL_NOTESTAUTO:
            return ("Automatic handling of TEST not supported");

      case DL_XIDAUTO:
            return ("Automatic handling of XID response");

      case DL_TESTAUTO:
            return ("Automatic handling of TEST response");

      case DL_PENDING:
            return ("Pending outstanding connect indications");

      default:
            sprintf(errstring, "Error %02x", dl_errno);
            return (errstring);
      }
}

static char *
dlprim(bpf_u_int32 prim)
{
      static char primbuf[80];

      switch (prim) {

      case DL_INFO_REQ:
            return ("DL_INFO_REQ");

      case DL_INFO_ACK:
            return ("DL_INFO_ACK");

      case DL_ATTACH_REQ:
            return ("DL_ATTACH_REQ");

      case DL_DETACH_REQ:
            return ("DL_DETACH_REQ");

      case DL_BIND_REQ:
            return ("DL_BIND_REQ");

      case DL_BIND_ACK:
            return ("DL_BIND_ACK");

      case DL_UNBIND_REQ:
            return ("DL_UNBIND_REQ");

      case DL_OK_ACK:
            return ("DL_OK_ACK");

      case DL_ERROR_ACK:
            return ("DL_ERROR_ACK");

      case DL_SUBS_BIND_REQ:
            return ("DL_SUBS_BIND_REQ");

      case DL_SUBS_BIND_ACK:
            return ("DL_SUBS_BIND_ACK");

      case DL_UNITDATA_REQ:
            return ("DL_UNITDATA_REQ");

      case DL_UNITDATA_IND:
            return ("DL_UNITDATA_IND");

      case DL_UDERROR_IND:
            return ("DL_UDERROR_IND");

      case DL_UDQOS_REQ:
            return ("DL_UDQOS_REQ");

      case DL_CONNECT_REQ:
            return ("DL_CONNECT_REQ");

      case DL_CONNECT_IND:
            return ("DL_CONNECT_IND");

      case DL_CONNECT_RES:
            return ("DL_CONNECT_RES");

      case DL_CONNECT_CON:
            return ("DL_CONNECT_CON");

      case DL_TOKEN_REQ:
            return ("DL_TOKEN_REQ");

      case DL_TOKEN_ACK:
            return ("DL_TOKEN_ACK");

      case DL_DISCONNECT_REQ:
            return ("DL_DISCONNECT_REQ");

      case DL_DISCONNECT_IND:
            return ("DL_DISCONNECT_IND");

      case DL_RESET_REQ:
            return ("DL_RESET_REQ");

      case DL_RESET_IND:
            return ("DL_RESET_IND");

      case DL_RESET_RES:
            return ("DL_RESET_RES");

      case DL_RESET_CON:
            return ("DL_RESET_CON");

      default:
            (void) sprintf(primbuf, "unknown primitive 0x%x", prim);
            return (primbuf);
      }
}

static int
dlattachreq(int fd, bpf_u_int32 ppa, char *ebuf)
{
      dl_attach_req_t   req;

      req.dl_primitive = DL_ATTACH_REQ;
      req.dl_ppa = ppa;

      return (send_request(fd, (char *)&req, sizeof(req), "attach", ebuf));
}

static int
dlbindreq(int fd, bpf_u_int32 sap, char *ebuf)
{

      dl_bind_req_t     req;

      memset((char *)&req, 0, sizeof(req));
      req.dl_primitive = DL_BIND_REQ;
      /* XXX - what if neither of these are defined? */
#if defined(DL_HP_RAWDLS)
      req.dl_max_conind = 1;              /* XXX magic number */
      req.dl_service_mode = DL_HP_RAWDLS;
#elif defined(DL_CLDLS)
      req.dl_service_mode = DL_CLDLS;
#endif
      req.dl_sap = sap;

      return (send_request(fd, (char *)&req, sizeof(req), "bind", ebuf));
}

static int
dlbindack(int fd, char *bufp, char *ebuf, int *uerror)
{

      return (recv_ack(fd, DL_BIND_ACK_SIZE, "bind", bufp, ebuf, uerror));
}

static int
dlpromisconreq(int fd, bpf_u_int32 level, char *ebuf)
{
      dl_promiscon_req_t req;

      req.dl_primitive = DL_PROMISCON_REQ;
      req.dl_level = level;

      return (send_request(fd, (char *)&req, sizeof(req), "promiscon", ebuf));
}

static int
dlokack(int fd, const char *what, char *bufp, char *ebuf)
{

      return (recv_ack(fd, DL_OK_ACK_SIZE, what, bufp, ebuf, NULL));
}


static int
dlinforeq(int fd, char *ebuf)
{
      dl_info_req_t req;

      req.dl_primitive = DL_INFO_REQ;

      return (send_request(fd, (char *)&req, sizeof(req), "info", ebuf));
}

static int
dlinfoack(int fd, char *bufp, char *ebuf)
{

      return (recv_ack(fd, DL_INFO_ACK_SIZE, "info", bufp, ebuf, NULL));
}

#ifdef DL_HP_RAWDLS
/*
 * There's an ack *if* there's an error.
 */
static int
dlrawdatareq(int fd, const u_char *datap, int datalen)
{
      struct strbuf ctl, data;
      long buf[MAXDLBUF];     /* XXX - char? */
      union DL_primitives *dlp;
      int dlen;

      dlp = (union DL_primitives*) buf;

      dlp->dl_primitive = DL_HP_RAWDATA_REQ;
      dlen = DL_HP_RAWDATA_REQ_SIZE;

      /*
       * HP's documentation doesn't appear to show us supplying any
       * address pointed to by the control part of the message.
       * I think that's what raw mode means - you just send the raw
       * packet, you don't specify where to send it to, as that's
       * implied by the destination address.
       */
      ctl.maxlen = 0;
      ctl.len = dlen;
      ctl.buf = (void *)buf;

      data.maxlen = 0;
      data.len = datalen;
      data.buf = (void *)datap;

      return (putmsg(fd, &ctl, &data, 0));
}
#endif /* DL_HP_RAWDLS */

#ifdef HAVE_SYS_BUFMOD_H
static int
strioctl(int fd, int cmd, int len, char *dp)
{
      struct strioctl str;
      int rc;

      str.ic_cmd = cmd;
      str.ic_timout = -1;
      str.ic_len = len;
      str.ic_dp = dp;
      rc = ioctl(fd, I_STR, &str);

      if (rc < 0)
            return (rc);
      else
            return (str.ic_len);
}
#endif

#if defined(HAVE_SOLARIS) && defined(HAVE_SYS_BUFMOD_H)
static char *
get_release(bpf_u_int32 *majorp, bpf_u_int32 *minorp, bpf_u_int32 *microp)
{
      char *cp;
      static char buf[32];

      *majorp = 0;
      *minorp = 0;
      *microp = 0;
      if (sysinfo(SI_RELEASE, buf, sizeof(buf)) < 0)
            return ("?");
      cp = buf;
      if (!isdigit((unsigned char)*cp))
            return (buf);
      *majorp = strtol(cp, &cp, 10);
      if (*cp++ != '.')
            return (buf);
      *minorp =  strtol(cp, &cp, 10);
      if (*cp++ != '.')
            return (buf);
      *microp =  strtol(cp, &cp, 10);
      return (buf);
}
#endif

#ifdef DL_HP_PPA_REQ
/*
 * Under HP-UX 10 and HP-UX 11, we can ask for the ppa
 */


/*
 * Determine ppa number that specifies ifname.
 *
 * If the "dl_hp_ppa_info_t" doesn't have a "dl_module_id_1" member,
 * the code that's used here is the old code for HP-UX 10.x.
 *
 * However, HP-UX 10.20, at least, appears to have such a member
 * in its "dl_hp_ppa_info_t" structure, so the new code is used.
 * The new code didn't work on an old 10.20 system on which Rick
 * Jones of HP tried it, but with later patches installed, it
 * worked - it appears that the older system had those members but
 * didn't put anything in them, so, if the search by name fails, we
 * do the old search.
 *
 * Rick suggests that making sure your system is "up on the latest
 * lancommon/DLPI/driver patches" is probably a good idea; it'd fix
 * that problem, as well as allowing libpcap to see packets sent
 * from the system on which the libpcap application is being run.
 * (On 10.20, in addition to getting the latest patches, you need
 * to turn the kernel "lanc_outbound_promisc_flag" flag on with ADB;
 * a posting to "comp.sys.hp.hpux" at
 *
 *    http://www.deja.com/[ST_rn=ps]/getdoc.xp?AN=558092266
 *
 * says that, to see the machine's outgoing traffic, you'd need to
 * apply the right patches to your system, and also set that variable
 * with:

echo 'lanc_outbound_promisc_flag/W1' | /usr/bin/adb -w /stand/vmunix /dev/kmem

 * which could be put in, for example, "/sbin/init.d/lan".
 *
 * Setting the variable is not necessary on HP-UX 11.x.
 */
static int
get_dlpi_ppa(register int fd, register const char *device, register int unit,
    register char *ebuf)
{
      register dl_hp_ppa_ack_t *ap;
      register dl_hp_ppa_info_t *ipstart, *ip;
      register int i;
      char dname[100];
      register u_long majdev;
      struct stat statbuf;
      dl_hp_ppa_req_t   req;
      char buf[MAXDLBUF];
      char *ppa_data_buf;
      dl_hp_ppa_ack_t   *dlp;
      struct strbuf ctl;
      int flags;
      int ppa;

      memset((char *)&req, 0, sizeof(req));
      req.dl_primitive = DL_HP_PPA_REQ;

      memset((char *)buf, 0, sizeof(buf));
      if (send_request(fd, (char *)&req, sizeof(req), "hpppa", ebuf) < 0)
            return (-1);

      ctl.maxlen = DL_HP_PPA_ACK_SIZE;
      ctl.len = 0;
      ctl.buf = (char *)buf;

      flags = 0;
      /*
       * DLPI may return a big chunk of data for a DL_HP_PPA_REQ. The normal
       * recv_ack will fail because it set the maxlen to MAXDLBUF (8192)
       * which is NOT big enough for a DL_HP_PPA_REQ.
       *
       * This causes libpcap applications to fail on a system with HP-APA
       * installed.
       *
       * To figure out how big the returned data is, we first call getmsg
       * to get the small head and peek at the head to get the actual data
       * length, and  then issue another getmsg to get the actual PPA data.
       */
      /* get the head first */
      if (getmsg(fd, &ctl, (struct strbuf *)NULL, &flags) < 0) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE,
                "get_dlpi_ppa: hpppa getmsg: %s", pcap_strerror(errno));
            return (-1);
      }

      dlp = (dl_hp_ppa_ack_t *)ctl.buf;
      if (dlp->dl_primitive != DL_HP_PPA_ACK) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE,
                "get_dlpi_ppa: hpppa unexpected primitive ack 0x%x",
                (bpf_u_int32)dlp->dl_primitive);
            return (-1);
      }

      if (ctl.len < DL_HP_PPA_ACK_SIZE) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE,
                "get_dlpi_ppa: hpppa ack too small (%d < %lu)",
                 ctl.len, (unsigned long)DL_HP_PPA_ACK_SIZE);
            return (-1);
      }

      /* allocate buffer */
      if ((ppa_data_buf = (char *)malloc(dlp->dl_length)) == NULL) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE,
                "get_dlpi_ppa: hpppa malloc: %s", pcap_strerror(errno));
            return (-1);
      }
      ctl.maxlen = dlp->dl_length;
      ctl.len = 0;
      ctl.buf = (char *)ppa_data_buf;
      /* get the data */
      if (getmsg(fd, &ctl, (struct strbuf *)NULL, &flags) < 0) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE,
                "get_dlpi_ppa: hpppa getmsg: %s", pcap_strerror(errno));
            free(ppa_data_buf);
            return (-1);
      }
      if (ctl.len < dlp->dl_length) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE,
                "get_dlpi_ppa: hpppa ack too small (%d < %d)",
                ctl.len, dlp->dl_length);
            free(ppa_data_buf);
            return (-1);
      }

      ap = (dl_hp_ppa_ack_t *)buf;
      ipstart = (dl_hp_ppa_info_t *)ppa_data_buf;
      ip = ipstart;

#ifdef HAVE_HP_PPA_INFO_T_DL_MODULE_ID_1
      /*
       * The "dl_hp_ppa_info_t" structure has a "dl_module_id_1"
       * member that should, in theory, contain the part of the
       * name for the device that comes before the unit number,
       * and should also have a "dl_module_id_2" member that may
       * contain an alternate name (e.g., I think Ethernet devices
       * have both "lan", for "lanN", and "snap", for "snapN", with
       * the former being for Ethernet packets and the latter being
       * for 802.3/802.2 packets).
       *
       * Search for the device that has the specified name and
       * instance number.
       */
      for (i = 0; i < ap->dl_count; i++) {
            if ((strcmp((const char *)ip->dl_module_id_1, device) == 0 ||
                 strcmp((const char *)ip->dl_module_id_2, device) == 0) &&
                ip->dl_instance_num == unit)
                  break;

            ip = (dl_hp_ppa_info_t *)((u_char *)ipstart + ip->dl_next_offset);
      }
#else
      /*
       * We don't have that member, so the search is impossible; make it
       * look as if the search failed.
       */
      i = ap->dl_count;
#endif

      if (i == ap->dl_count) {
            /*
             * Well, we didn't, or can't, find the device by name.
             *
             * HP-UX 10.20, whilst it has "dl_module_id_1" and
             * "dl_module_id_2" fields in the "dl_hp_ppa_info_t",
             * doesn't seem to fill them in unless the system is
             * at a reasonably up-to-date patch level.
             *
             * Older HP-UX 10.x systems might not have those fields
             * at all.
             *
             * Therefore, we'll search for the entry with the major
             * device number of a device with the name "/dev/<dev><unit>",
             * if such a device exists, as the old code did.
             */
            snprintf(dname, sizeof(dname), "/dev/%s%d", device, unit);
            if (stat(dname, &statbuf) < 0) {
                  snprintf(ebuf, PCAP_ERRBUF_SIZE, "stat: %s: %s",
                      dname, pcap_strerror(errno));
                  return (-1);
            }
            majdev = major(statbuf.st_rdev);

            ip = ipstart;

            for (i = 0; i < ap->dl_count; i++) {
                  if (ip->dl_mjr_num == majdev &&
                      ip->dl_instance_num == unit)
                        break;

                  ip = (dl_hp_ppa_info_t *)((u_char *)ipstart + ip->dl_next_offset);
            }
      }
      if (i == ap->dl_count) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE,
                "can't find /dev/dlpi PPA for %s%d", device, unit);
            return (-1);
      }
      if (ip->dl_hdw_state == HDW_DEAD) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE,
                "%s%d: hardware state: DOWN\n", device, unit);
            free(ppa_data_buf);
            return (-1);
      }
      ppa = ip->dl_ppa;
      free(ppa_data_buf);
      return (ppa);
}
#endif

#ifdef HAVE_HPUX9
/*
 * Under HP-UX 9, there is no good way to determine the ppa.
 * So punt and read it from /dev/kmem.
 */
static struct nlist nl[] = {
#define NL_IFNET 0
      { "ifnet" },
      { "" }
};

static char path_vmunix[] = "/hp-ux";

/* Determine ppa number that specifies ifname */
static int
get_dlpi_ppa(register int fd, register const char *ifname, register int unit,
    register char *ebuf)
{
      register const char *cp;
      register int kd;
      void *addr;
      struct ifnet ifnet;
      char if_name[sizeof(ifnet.if_name) + 1];

      cp = strrchr(ifname, '/');
      if (cp != NULL)
            ifname = cp + 1;
      if (nlist(path_vmunix, &nl) < 0) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE, "nlist %s failed",
                path_vmunix);
            return (-1);
      }
      if (nl[NL_IFNET].n_value == 0) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE,
                "could't find %s kernel symbol",
                nl[NL_IFNET].n_name);
            return (-1);
      }
      kd = open("/dev/kmem", O_RDONLY);
      if (kd < 0) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE, "kmem open: %s",
                pcap_strerror(errno));
            return (-1);
      }
      if (dlpi_kread(kd, nl[NL_IFNET].n_value,
          &addr, sizeof(addr), ebuf) < 0) {
            close(kd);
            return (-1);
      }
      for (; addr != NULL; addr = ifnet.if_next) {
            if (dlpi_kread(kd, (off_t)addr,
                &ifnet, sizeof(ifnet), ebuf) < 0 ||
                dlpi_kread(kd, (off_t)ifnet.if_name,
                if_name, sizeof(ifnet.if_name), ebuf) < 0) {
                  (void)close(kd);
                  return (-1);
            }
            if_name[sizeof(ifnet.if_name)] = '\0';
            if (strcmp(if_name, ifname) == 0 && ifnet.if_unit == unit)
                  return (ifnet.if_index);
      }

      snprintf(ebuf, PCAP_ERRBUF_SIZE, "Can't find %s", ifname);
      return (-1);
}

static int
dlpi_kread(register int fd, register off_t addr,
    register void *buf, register u_int len, register char *ebuf)
{
      register int cc;

      if (lseek(fd, addr, SEEK_SET) < 0) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE, "lseek: %s",
                pcap_strerror(errno));
            return (-1);
      }
      cc = read(fd, buf, len);
      if (cc < 0) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE, "read: %s",
                pcap_strerror(errno));
            return (-1);
      } else if (cc != len) {
            snprintf(ebuf, PCAP_ERRBUF_SIZE, "short read (%d != %d)", cc,
                len);
            return (-1);
      }
      return (cc);
}
#endif

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