mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-29 15:10:57 +01:00
681ed54caa
MFC after: 1 month
320 lines
7.8 KiB
C
320 lines
7.8 KiB
C
/*
|
|
* Copyright (c) 2009 Felix Obenhuber
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* SocketCan sniffing API implementation for Linux platform
|
|
* By Felix Obenhuber <felix@obenhuber.de>
|
|
*
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include "pcap-int.h"
|
|
#include "pcap-can-linux.h"
|
|
|
|
#ifdef NEED_STRERROR_H
|
|
#include "strerror.h"
|
|
#endif
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <string.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
#include <net/if.h>
|
|
#include <arpa/inet.h>
|
|
|
|
#include <linux/can.h>
|
|
#include <linux/can/raw.h>
|
|
|
|
/* not yet defined anywhere */
|
|
#ifndef PF_CAN
|
|
#define PF_CAN 29
|
|
#endif
|
|
#ifndef AF_CAN
|
|
#define AF_CAN PF_CAN
|
|
#endif
|
|
|
|
/* forward declaration */
|
|
static int can_activate(pcap_t *);
|
|
static int can_read_linux(pcap_t *, int , pcap_handler , u_char *);
|
|
static int can_inject_linux(pcap_t *, const void *, size_t);
|
|
static int can_setfilter_linux(pcap_t *, struct bpf_program *);
|
|
static int can_setdirection_linux(pcap_t *, pcap_direction_t);
|
|
static int can_stats_linux(pcap_t *, struct pcap_stat *);
|
|
|
|
/*
|
|
* Private data for capturing on Linux CANbus devices.
|
|
*/
|
|
struct pcap_can {
|
|
int ifindex; /* interface index of device we're bound to */
|
|
};
|
|
|
|
int
|
|
can_findalldevs(pcap_if_t **devlistp, char *errbuf)
|
|
{
|
|
/*
|
|
* There are no platform-specific devices since each device
|
|
* exists as a regular network interface.
|
|
*
|
|
* XXX - true?
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
pcap_t *
|
|
can_create(const char *device, char *ebuf, int *is_ours)
|
|
{
|
|
const char *cp;
|
|
char *cpend;
|
|
long devnum;
|
|
pcap_t* p;
|
|
|
|
/* Does this look like a CANbus device? */
|
|
cp = strrchr(device, '/');
|
|
if (cp == NULL)
|
|
cp = device;
|
|
/* Does it begin with "can" or "vcan"? */
|
|
if (strncmp(cp, "can", 3) == 0) {
|
|
/* Begins with "can" */
|
|
cp += 3; /* skip past "can" */
|
|
} else if (strncmp(cp, "vcan", 4) == 0) {
|
|
/* Begins with "vcan" */
|
|
cp += 4;
|
|
} else {
|
|
/* Nope, doesn't begin with "can" or "vcan" */
|
|
*is_ours = 0;
|
|
return NULL;
|
|
}
|
|
/* Yes - is "can" or "vcan" followed by a number from 0? */
|
|
devnum = strtol(cp, &cpend, 10);
|
|
if (cpend == cp || *cpend != '\0') {
|
|
/* Not followed by a number. */
|
|
*is_ours = 0;
|
|
return NULL;
|
|
}
|
|
if (devnum < 0) {
|
|
/* Followed by a non-valid number. */
|
|
*is_ours = 0;
|
|
return NULL;
|
|
}
|
|
|
|
/* OK, it's probably ours. */
|
|
*is_ours = 1;
|
|
|
|
p = pcap_create_common(device, ebuf, sizeof (struct pcap_can));
|
|
if (p == NULL)
|
|
return (NULL);
|
|
|
|
p->activate_op = can_activate;
|
|
return (p);
|
|
}
|
|
|
|
|
|
static int
|
|
can_activate(pcap_t* handle)
|
|
{
|
|
struct pcap_can *handlep = handle->priv;
|
|
struct sockaddr_can addr;
|
|
struct ifreq ifr;
|
|
|
|
/* Initialize some components of the pcap structure. */
|
|
handle->bufsize = 24;
|
|
handle->offset = 8;
|
|
handle->linktype = DLT_CAN_SOCKETCAN;
|
|
handle->read_op = can_read_linux;
|
|
handle->inject_op = can_inject_linux;
|
|
handle->setfilter_op = can_setfilter_linux;
|
|
handle->setdirection_op = can_setdirection_linux;
|
|
handle->set_datalink_op = NULL;
|
|
handle->getnonblock_op = pcap_getnonblock_fd;
|
|
handle->setnonblock_op = pcap_setnonblock_fd;
|
|
handle->stats_op = can_stats_linux;
|
|
|
|
/* Create socket */
|
|
handle->fd = socket(PF_CAN, SOCK_RAW, CAN_RAW);
|
|
if (handle->fd < 0)
|
|
{
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't create raw socket %d:%s",
|
|
errno, strerror(errno));
|
|
return PCAP_ERROR;
|
|
}
|
|
|
|
/* get interface index */
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
strncpy(ifr.ifr_name, handle->opt.source, sizeof(ifr.ifr_name));
|
|
if (ioctl(handle->fd, SIOCGIFINDEX, &ifr) < 0)
|
|
{
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
|
|
"Unable to get interface index: %s",
|
|
pcap_strerror(errno));
|
|
pcap_cleanup_live_common(handle);
|
|
return PCAP_ERROR;
|
|
}
|
|
handlep->ifindex = ifr.ifr_ifindex;
|
|
|
|
/* allocate butter */
|
|
handle->buffer = malloc(handle->bufsize);
|
|
if (!handle->buffer)
|
|
{
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate dump buffer: %s",
|
|
pcap_strerror(errno));
|
|
pcap_cleanup_live_common(handle);
|
|
return PCAP_ERROR;
|
|
}
|
|
|
|
/* Bind to the socket */
|
|
addr.can_family = AF_CAN;
|
|
addr.can_ifindex = handlep->ifindex;
|
|
if( bind( handle->fd, (struct sockaddr*)&addr, sizeof(addr) ) < 0 )
|
|
{
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't attach to device %d %d:%s",
|
|
handlep->ifindex, errno, strerror(errno));
|
|
pcap_cleanup_live_common(handle);
|
|
return PCAP_ERROR;
|
|
}
|
|
|
|
if (handle->opt.rfmon)
|
|
{
|
|
/* Monitor mode doesn't apply to CAN devices. */
|
|
pcap_cleanup_live_common(handle);
|
|
return PCAP_ERROR_RFMON_NOTSUP;
|
|
}
|
|
|
|
handle->selectable_fd = handle->fd;
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
static int
|
|
can_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user)
|
|
{
|
|
struct msghdr msg;
|
|
struct pcap_pkthdr pkth;
|
|
struct iovec iv;
|
|
struct can_frame* cf;
|
|
|
|
iv.iov_base = &handle->buffer[handle->offset];
|
|
iv.iov_len = handle->snapshot;
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
msg.msg_iov = &iv;
|
|
msg.msg_iovlen = 1;
|
|
msg.msg_control = handle->buffer;
|
|
msg.msg_controllen = handle->offset;
|
|
|
|
do
|
|
{
|
|
pkth.caplen = recvmsg(handle->fd, &msg, 0);
|
|
if (handle->break_loop)
|
|
{
|
|
handle->break_loop = 0;
|
|
return -2;
|
|
}
|
|
} while ((pkth.caplen == -1) && (errno == EINTR));
|
|
|
|
if (pkth.caplen == -1)
|
|
{
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't receive packet %d:%s",
|
|
errno, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
/* adjust capture len according to frame len */
|
|
cf = (struct can_frame*)&handle->buffer[8];
|
|
pkth.caplen -= 8 - cf->can_dlc;
|
|
pkth.len = pkth.caplen;
|
|
|
|
cf->can_id = htonl( cf->can_id );
|
|
|
|
if( -1 == gettimeofday(&pkth.ts, NULL) )
|
|
{
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't get time of day %d:%s",
|
|
errno, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
callback(user, &pkth, &handle->buffer[8]);
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int
|
|
can_inject_linux(pcap_t *handle, const void *buf, size_t size)
|
|
{
|
|
/* not yet implemented */
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported on "
|
|
"can devices");
|
|
return (-1);
|
|
}
|
|
|
|
|
|
static int
|
|
can_stats_linux(pcap_t *handle, struct pcap_stat *stats)
|
|
{
|
|
/* not yet implemented */
|
|
stats->ps_recv = 0; /* number of packets received */
|
|
stats->ps_drop = 0; /* number of packets dropped */
|
|
stats->ps_ifdrop = 0; /* drops by interface -- only supported on some platforms */
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
can_setfilter_linux(pcap_t *p, struct bpf_program *fp)
|
|
{
|
|
/* not yet implemented */
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
can_setdirection_linux(pcap_t *p, pcap_direction_t d)
|
|
{
|
|
/* no support for PCAP_D_OUT */
|
|
if (d == PCAP_D_OUT)
|
|
{
|
|
snprintf(p->errbuf, sizeof(p->errbuf),
|
|
"Setting direction to PCAP_D_OUT is not supported on can");
|
|
return -1;
|
|
}
|
|
|
|
p->direction = d;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* eof */
|