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