[libpcap] / 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.
 */

/*
 * Packet capture routine for dlpi under SunOS 5
 *
 * Notes:
 *
 *    - Apparently 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.
 */

#ifndef lint
static const char rcsid[] =
    "@(#) $Header: /tcpdump/master/libpcap/pcap-dlpi.c,v 1.61 2000-10-12 03:53:58 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_ACK_OBS
#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>

#include "pcap-int.h"

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

#ifndef PCAP_DEV_PREFIX
#define PCAP_DEV_PREFIX "/dev"
#endif

#define MAXDLBUF        8192

/* Forwards */
static int dlattachreq(int, bpf_u_int32, char *);
static int dlbindack(int, char *, char *);
static int dlbindreq(int, bpf_u_int32, char *);
static int dlinfoack(int, char *, char *);
static int dlinforeq(int, char *);
static int dlokack(int, const char *, char *, char *);
static int recv_ack(int, int, const char *, char *, char *);
static int dlpromisconreq(int, bpf_u_int32, char *);
#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

int
pcap_stats(pcap_t *p, struct pcap_stat *ps)
{

        *ps = p->md.stat;
        return (0);
}

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

int
pcap_read(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 = MAXDLBUF;
                data.len = 0;
                do {
                        if (getmsg(p->fd, &ctl, &data, &flags) < 0) {
                                /* Don't choke when we get ptraced */
                                if (errno == EINTR) {
                                        cc = 0;
                                        continue;
                                }
                                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) {
#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 = sbp->sbh_timestamp;
#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);
}

pcap_t *
pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
{
        register char *cp;
        char *eos;
        register pcap_t *p;
        register int ppa;
        register dl_info_ack_t *infop;
#ifdef HAVE_SYS_BUFMOD_H
        bpf_u_int32 ss, flag;
#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));

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

        /*
         * Split the name into a device type and a unit number.
         */
        cp = strpbrk(dname, "0123456789");
        if (cp == NULL) {
                snprintf(ebuf, PCAP_ERRBUF_SIZE,
                    "%s missing unit number", device);
                goto bad;
        }
        ppa = strtol(cp, &eos, 10);
        if (*eos != '\0') {
                snprintf(ebuf, PCAP_ERRBUF_SIZE,
                    "%s bad unit number", device);
                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;
        }

        /*
         * 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
        /*
        ** Determine device and ppa
        */
        cp = strpbrk(device, "0123456789");
        if (cp == NULL) {
                snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s missing unit number",
                    device);
                goto bad;
        }
        ppa = strtol(cp, &eos, 10);
        if (*eos != '\0') {
                snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s bad unit number", device);
                goto bad;
        }

        if (*device == '/')
                strlcpy(dname, device, sizeof(dname));
        else
                snprintf(dname, sizeof(dname), "%s/%s", PCAP_DEV_PREFIX,
                    device);

        /* Try device without unit number */
        strlcpy(dname2, dname, sizeof(dname2));
        cp = strchr(dname, *cp);
        *cp = '\0';
        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) {
                        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;
        if (infop->dl_provider_style == DL_STYLE2 &&
            (dlattachreq(p->fd, ppa, ebuf) < 0 ||
            dlokack(p->fd, "attach", (char *)buf, ebuf) < 0))
                goto bad;
        /*
        ** Bind (defer if using HP-UX 9 or HP-UX 10.20, totally skip if
        ** using SINIX)
        */
#if !defined(HAVE_HPUX9) && !defined(HAVE_HPUX10_20) && !defined(sinix)
#ifdef _AIX
        /* According to IBM's AIX Support Line, the dl_sap value
        ** should not be less than 0x600 (1536) for standard ethernet 
         */
        if (dlbindreq(p->fd, 1537, ebuf) < 0 ||
#else
        if (dlbindreq(p->fd, 0, ebuf) < 0 ||
#endif
            dlbindack(p->fd, (char *)buf, ebuf) < 0)
                goto bad;
#endif

        if (promisc) {
                /*
                ** Enable promiscuous
                */
                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)
                */
#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 (when not in promiscuous mode when using
        ** using HP-UX and never under SINIX)
        */
#ifndef sinix
        if (
#ifdef __hpux
            !promisc &&
#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

        /*
        ** HP-UX 9 and HP-UX 10.20 must bind after setting promiscuous
        ** options)
        */
#if defined(HAVE_HPUX9) || defined(HAVE_HPUX10_20)
        if (dlbindreq(p->fd, 0, ebuf) < 0 ||
            dlbindack(p->fd, (char *)buf, ebuf) < 0)
                goto bad;
#endif

        /*
        ** Determine link type
        */
        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;
                break;

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

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

#ifdef  DLIOCRAW
        /*
        ** This is a non standard SunOS hack to get the ethernet 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 flags
        */
        if (strioctl(p->fd, SBIOCGFLAGS, sizeof(flag), (char *)&flag) < 0) {
                snprintf(ebuf, PCAP_ERRBUF_SIZE, "SBIOCGFLAGS: %s",
                    pcap_strerror(errno));
                goto bad;
        }
        flag |= SB_NO_DROPS;
        if (strioctl(p->fd, SBIOCSFLAGS, sizeof(flag), (char *)&flag) != 0) {
                snprintf(ebuf, PCAP_ERRBUF_SIZE, "SBIOCSFLAGS: %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 = MAXDLBUF * sizeof(bpf_u_int32);
        p->buffer = (u_char *)malloc(p->bufsize + p->offset);

        return (p);
bad:
        free(p);
        return (NULL);
}

int
pcap_setfilter(pcap_t *p, struct bpf_program *fp)
{

        p->fcode = *fp;
        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)
{
        union   DL_primitives   *dlp;
        struct  strbuf  ctl;
        int     flags;

        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_BADPPA:
                        snprintf(ebuf, PCAP_ERRBUF_SIZE,
                            "recv_ack: %s bad ppa (device unit)", what);
                        break;


                case DL_SYSERR:
                        snprintf(ebuf, PCAP_ERRBUF_SIZE, "recv_ack: %s: %s",
                            what, pcap_strerror(dlp->error_ack.dl_unix_errno));
                        break;

                case DL_UNSUPPORTED:
                        snprintf(ebuf, PCAP_ERRBUF_SIZE,
                            "recv_ack: %s: Service not supplied by provider",
                            what);
                        break;

                default:
                        snprintf(ebuf, PCAP_ERRBUF_SIZE,
                            "recv_ack: %s error 0x%x",
                            what, (bpf_u_int32)dlp->error_ack.dl_errno);
                        break;
                }
                return (-1);

        default:
                snprintf(ebuf, PCAP_ERRBUF_SIZE,
                    "recv_ack: %s unexpected primitive ack 0x%x ",
                    what, (bpf_u_int32)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 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;
#ifdef DL_HP_RAWDLS
        req.dl_max_conind = 1;                  /* XXX magic number */
        /* 22 is INSAP as per the HP-UX DLPI Programmer's Guide */
        req.dl_sap = 22;
        req.dl_service_mode = DL_HP_RAWDLS;
#else
        req.dl_sap = sap;
#ifdef DL_CLDLS
        req.dl_service_mode = DL_CLDLS;
#endif
#endif

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

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

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

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));
}


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));
}

#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(*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_ACK_OBS
/*
 * 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;
        bpf_u_int32 buf[MAXDLBUF];

        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 ||
            recv_ack(fd, DL_HP_PPA_ACK_SIZE, "hpppa", (char *)buf, ebuf) < 0)
                return (-1);

        ap = (dl_hp_ppa_ack_t *)buf;
        ipstart = (dl_hp_ppa_info_t *)((u_char *)ap + ap->dl_offset);
        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(ip->dl_module_id_1, device) == 0 ||
                     strcmp(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", device);
                return (-1);
        }
        if (ip->dl_hdw_state == HDW_DEAD) {
                snprintf(ebuf, PCAP_ERRBUF_SIZE,
                    "%s: hardware state: DOWN\n", device);
                return (-1);
        }
        return ((int)ip->dl_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