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pcap-dlpi.c
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pcap-dlpi.c
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/*
* 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>,
* Mark C. Brown (mbrown@hp.com), and Sagun Shakya <Sagun.Shakya@Sun.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 1.128 2008-12-02 16:20:23 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"
#include "dlpisubs.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
/* 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 HAVE_DLPI_PASSIVE
static void dlpassive(int, char *);
#endif
#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_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
/* 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)
{
int cc;
u_char *bp;
int flags;
struct strbuf data;
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;
return (pcap_process_pkts(p, callback, user, cnt, bp, cc));
}
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_cleanup_dlpi(pcap_t *p)
{
if (p->send_fd >= 0) {
close(p->send_fd);
p->send_fd = -1;
}
pcap_cleanup_live_common(p);
}
static int
pcap_activate_dlpi(pcap_t *p)
{
register char *cp;
int ppa;
#ifdef HAVE_SOLARIS
int isatm = 0;
#endif
register dl_info_ack_t *infop;
#ifdef HAVE_SYS_BUFMOD_H
bpf_u_int32 ss;
#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
int status = PCAP_ERROR;
#ifdef HAVE_DEV_DLPI
/*
** Remove any "/dev/" on the front of the device.
*/
cp = strrchr(p->opt.source, '/');
if (cp == NULL)
strlcpy(dname, p->opt.source, 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, p->errbuf);
if (cp == NULL) {
status = PCAP_ERROR_NO_SUCH_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) {
if (errno == EPERM || errno == EACCES)
status = PCAP_ERROR_PERM_DENIED;
snprintf(p->errbuf, 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, p->errbuf);
if (ppa < 0) {
status = ppa;
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 (*p->opt.source == '/')
strlcpy(dname, p->opt.source, sizeof(dname));
else
snprintf(dname, sizeof(dname), "%s/%s", PCAP_DEV_PREFIX,
p->opt.source);
/*
* Get the unit number, and a pointer to the end of the device
* type name.
*/
cp = split_dname(dname, &ppa, p->errbuf);
if (cp == NULL) {
status = PCAP_ERROR_NO_SUCH_DEVICE;
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) {
if (errno == EACCES)
status = PCAP_ERROR_PERM_DENIED;
snprintf(p->errbuf, 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) {
status = PCAP_ERROR_NO_SUCH_DEVICE;
/*
* We provide an error message even
* for this error, for diagnostic
* purposes (so that, for example,
* the app can show the message if the
* user requests it).
*
* In it, 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(p->errbuf, PCAP_ERRBUF_SIZE,
"%s: No DLPI device found", p->opt.source);
} else {
if (errno == EACCES)
status = PCAP_ERROR_PERM_DENIED;
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s: %s",
dname2, pcap_strerror(errno));
}
goto bad;
}
/* XXX Assume unit zero */
ppa = 0;
}
#endif
/*
** Attach if "style 2" provider
*/
if (dlinforeq(p->fd, p->errbuf) < 0 ||
dlinfoack(p->fd, (char *)buf, p->errbuf) < 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) {
status = dl_doattach(p->fd, ppa, p->errbuf);
if (status < 0)
goto bad;
#ifdef DL_HP_RAWDLS
if (p->send_fd >= 0) {
if (dl_doattach(p->send_fd, ppa, p->errbuf) < 0)
goto bad;
}
#endif
}
if (p->opt.rfmon) {
/*
* This device exists, but we don't support monitor mode
* any platforms that support DLPI.
*/
status = PCAP_ERROR_RFMON_NOTSUP;
goto bad;
}
#ifdef HAVE_DLPI_PASSIVE
/*
* Enable Passive mode to be able to capture on aggregated link.
* Not supported in all Solaris versions.
*/
dlpassive(p->fd, p->errbuf);
#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, p->errbuf) < 0 &&
dlbindreq(p->fd, 2, p->errbuf) < 0) ||
dlbindack(p->fd, (char *)buf, p->errbuf, NULL) < 0)
goto bad;
#elif defined(DL_HP_RAWDLS)
/*
** HP-UX 10.0x and 10.1x.
*/
if (dl_dohpuxbind(p->fd, p->errbuf) < 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, p->errbuf) < 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, p->errbuf) < 0 ||
dlbindack(p->fd, (char *)buf, p->errbuf, 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(p->errbuf, PCAP_ERRBUF_SIZE,
"A_PROMISCON_REQ: %s", pcap_strerror(errno));
goto bad;
}
} else
#endif
if (p->opt.promisc) {
/*
** Enable promiscuous (not necessary on send FD)
*/
if (dlpromisconreq(p->fd, DL_PROMISC_PHYS, p->errbuf) < 0 ||
dlokack(p->fd, "promisc_phys", (char *)buf, p->errbuf) < 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, p->errbuf) < 0 ||
dlokack(p->fd, "promisc_multi", (char *)buf, p->errbuf) < 0)
status = PCAP_WARNING;
#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
!p->opt.promisc &&
#endif
#ifdef HAVE_SOLARIS
!isatm &&
#endif
(dlpromisconreq(p->fd, DL_PROMISC_SAP, p->errbuf) < 0 ||
dlokack(p->fd, "promisc_sap", (char *)buf, p->errbuf) < 0)) {
/* Not fatal if promisc since the DL_PROMISC_PHYS worked */
if (p->opt.promisc)
status = PCAP_WARNING;
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, p->errbuf) < 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, p->errbuf) < 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, p->errbuf) < 0 ||
dlinfoack(p->fd, (char *)buf, p->errbuf) < 0)
goto bad;
infop = &((union DL_primitives *)buf)->info_ack;
if (pcap_process_mactype(p, infop->dl_mac_type) != 0)
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(p->errbuf, PCAP_ERRBUF_SIZE, "DLIOCRAW: %s",
pcap_strerror(errno));
goto bad;
}
#endif
#ifdef HAVE_SYS_BUFMOD_H
ss = p->snapshot;
/*
** 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 fixed in 5.3.2. Also, there is a patch available.
** Ask for bugid 1149065.
*/
#ifdef HAVE_SOLARIS
release = get_release(&osmajor, &osminor, &osmicro);
if (osmajor == 5 && (osminor <= 2 || (osminor == 3 && osmicro < 2)) &&
getenv("BUFMOD_FIXED") == NULL) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"WARNING: bufmod is broken in SunOS %s; ignoring snaplen.",
release);
ss = 0;
status = PCAP_WARNING;
}
#endif
/* Push and configure bufmod. */
if (pcap_conf_bufmod(p, ss, p->md.timeout) != 0)
goto bad;
#endif
/*
** As the last operation 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;
/* Success - but perhaps with a warning */
if (status < 0)
status = 0;
/*
* "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->cleanup_op = pcap_cleanup_dlpi;
return (status);
bad:
pcap_cleanup_dlpi(p);
return (status);
}
/*
* 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];
int err;
if (dlattachreq(fd, ppa, ebuf) < 0)
return (PCAP_ERROR);
err = dlokack(fd, "attach", (char *)buf, ebuf);
if (err < 0)
return (err);
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 (PCAP_ERROR);
}
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));
if (dlp->error_ack.dl_unix_errno == EACCES)
return (PCAP_ERROR_PERM_DENIED);
break;
default:
snprintf(ebuf, PCAP_ERRBUF_SIZE, "recv_ack: %s: %s",
what, dlstrerror(dlp->error_ack.dl_errno));
if (dlp->error_ack.dl_errno == DL_BADPPA)
return (PCAP_ERROR_NO_SUCH_DEVICE);
else if (dlp->error_ack.dl_errno == DL_ACCESS)
return (PCAP_ERROR_PERM_DENIED);
break;
}
return (PCAP_ERROR);
default:
snprintf(ebuf, PCAP_ERRBUF_SIZE,
"recv_ack: %s: Unexpected primitive ack %s",