fea8707db3
MFC after: 1 month
473 lines
12 KiB
C
473 lines
12 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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* Sockettrace 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 <libusb-1.0/libusb.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 <pthread.h>
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#include "pcap-int.h"
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#include "pcap-canusb-linux.h"
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#define CANUSB_IFACE "canusb"
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#define CANUSB_VID 0x0403
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#define CANUSB_PID 0x8990
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#define USE_THREAD 1
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#if USE_THREAD == 0
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#include <signal.h>
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#endif
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/* forward declaration */
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static int canusb_activate(pcap_t *);
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static int canusb_read_linux(pcap_t *, int , pcap_handler , u_char *);
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static int canusb_inject_linux(pcap_t *, const void *, size_t);
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static int canusb_setfilter_linux(pcap_t *, struct bpf_program *);
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static int canusb_setdirection_linux(pcap_t *, pcap_direction_t);
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static int canusb_stats_linux(pcap_t *, struct pcap_stat *);
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struct CAN_Msg
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{
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uint32_t timestamp;
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uint32_t id;
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uint32_t length;
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uint8_t data[8];
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};
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/*
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* Private data for capturing on Linux CANbus USB devices.
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*/
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struct pcap_canusb {
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libusb_context *ctx;
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libusb_device_handle *dev;
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pthread_t worker;
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int rdpipe, wrpipe;
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volatile int loop;
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};
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int canusb_findalldevs(pcap_if_t **alldevsp, char *err_str)
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{
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libusb_context *fdctx;
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libusb_device** devs;
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unsigned char sernum[65];
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int cnt, i;
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if (libusb_init(&fdctx) != 0) {
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/*
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* XXX - if this doesn't just mean "no USB file system mounted",
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* perhaps we should report a real error rather than just
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* saying "no CANUSB devices".
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*/
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return 0;
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}
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cnt = libusb_get_device_list(fdctx,&devs);
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for(i=0;i<cnt;i++)
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{
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int ret;
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// Check if this device is interesting.
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struct libusb_device_descriptor desc;
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libusb_get_device_descriptor(devs[i],&desc);
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if ((desc.idVendor != CANUSB_VID) || (desc.idProduct != CANUSB_PID))
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continue; //It is not, check next device
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//It is!
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libusb_device_handle *dh = NULL;
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if ((ret = libusb_open(devs[i],&dh)) == 0)
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{
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char dev_name[30];
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char dev_descr[50];
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int n = libusb_get_string_descriptor_ascii(dh,desc.iSerialNumber,sernum,64);
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sernum[n] = 0;
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snprintf(dev_name, 30, CANUSB_IFACE"%s", sernum);
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snprintf(dev_descr, 50, "CanUSB [%s]", sernum);
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libusb_close(dh);
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if (pcap_add_if(alldevsp, dev_name, 0, dev_descr, err_str) < 0)
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{
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libusb_free_device_list(devs,1);
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libusb_exit(fdctx);
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return -1;
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}
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}
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}
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libusb_free_device_list(devs,1);
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libusb_exit(fdctx);
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return 0;
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}
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static libusb_device_handle* canusb_opendevice(struct libusb_context *ctx, char* devserial)
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{
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libusb_device** devs;
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unsigned char serial[65];
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int cnt,i,n;
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cnt = libusb_get_device_list(ctx,&devs);
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for(i=0;i<cnt;i++)
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{
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// Check if this device is interesting.
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struct libusb_device_descriptor desc;
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libusb_get_device_descriptor(devs[i],&desc);
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if ((desc.idVendor != CANUSB_VID) || (desc.idProduct != CANUSB_PID))
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continue;
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//Found one!
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libusb_device_handle *dh = NULL;
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if (libusb_open(devs[i],&dh) != 0) continue;
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n = libusb_get_string_descriptor_ascii(dh,desc.iSerialNumber,serial,64);
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serial[n] = 0;
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if ((devserial) && (strcmp((char *)serial,devserial) != 0))
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{
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libusb_close(dh);
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continue;
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}
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if ((libusb_kernel_driver_active(dh,0)) && (libusb_detach_kernel_driver(dh,0) != 0))
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{
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libusb_close(dh);
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continue;
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}
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if (libusb_set_configuration(dh,1) != 0)
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{
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libusb_close(dh);
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continue;
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}
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if (libusb_claim_interface(dh,0) != 0)
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{
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libusb_close(dh);
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continue;
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}
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//Fount it!
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libusb_free_device_list(devs,1);
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return dh;
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}
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libusb_free_device_list(devs,1);
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return NULL;
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}
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pcap_t *
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canusb_create(const char *device, char *ebuf, int *is_ours)
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{
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const char *cp;
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char *cpend;
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long devnum;
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pcap_t* p;
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struct pcap_canusb *canusb;
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/* Does this look like a DAG device? */
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cp = strrchr(device, '/');
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if (cp == NULL)
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cp = device;
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/* Does it begin with "canusb"? */
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if (strncmp(cp, "canusb", 6) != 0) {
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/* Nope, doesn't begin with "canusb" */
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*is_ours = 0;
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return NULL;
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}
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/* Yes - is "canusb" followed by a number? */
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cp += 6;
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devnum = strtol(cp, &cpend, 10);
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if (cpend == cp || *cpend != '\0') {
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/* Not followed by a number. */
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*is_ours = 0;
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return NULL;
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}
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if (devnum < 0) {
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/* Followed by a non-valid number. */
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*is_ours = 0;
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return NULL;
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}
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/* OK, it's probably ours. */
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*is_ours = 1;
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p = pcap_create_common(device, ebuf, sizeof (struct pcap_canusb));
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if (p == NULL)
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return (NULL);
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canusb = p->priv;
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canusb->ctx = NULL;
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canusb->dev = NULL;
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canusb->rdpipe = -1;
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canusb->wrpipe = -1;
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p->activate_op = canusb_activate;
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return (p);
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}
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static void* canusb_capture_thread(void *arg)
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{
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struct pcap_canusb *canusb = arg;
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int i;
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struct
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{
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uint8_t rxsz, txsz;
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} status;
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fcntl(canusb->wrpipe, F_SETFL, O_NONBLOCK);
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while(canusb->loop)
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{
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int sz;
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struct CAN_Msg msg;
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libusb_interrupt_transfer(canusb->dev, 0x81, (unsigned char*)&status, sizeof(status), &sz, 100);
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//HACK!!!!! -> drop buffered data, read new one by reading twice.
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libusb_interrupt_transfer(canusb->dev, 0x81, (unsigned char*)&status, sizeof(status), &sz, 100);
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for(i = 0; i<status.rxsz; i++)
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{
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libusb_bulk_transfer(canusb->dev, 0x85, (unsigned char*)&msg, sizeof(msg), &sz, 100);
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write(canusb->wrpipe, &msg, sizeof(msg));
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}
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}
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return NULL;
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}
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static int canusb_startcapture(struct pcap_canusb* this)
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{
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int pipefd[2];
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if (pipe(pipefd) == -1)
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return -1;
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this->rdpipe = pipefd[0];
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this->wrpipe = pipefd[1];
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this->loop = 1;
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pthread_create(&this->worker, NULL, canusb_capture_thread, this);
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return this->rdpipe;
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}
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static void canusb_clearbufs(struct pcap_canusb* this)
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{
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unsigned char cmd[16];
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int al;
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cmd[0] = 1; //Empty incoming buffer
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cmd[1] = 1; //Empty outgoing buffer
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cmd[3] = 0; //Not a write to serial number
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memset(&cmd[4],0,16-4);
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libusb_interrupt_transfer(this->dev, 0x1,cmd,16,&al,100);
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}
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static void canusb_close(pcap_t* handle)
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{
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struct pcap_canusb *canusb = handle->priv;
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canusb->loop = 0;
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pthread_join(canusb->worker, NULL);
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if (canusb->dev)
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{
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libusb_close(canusb->dev);
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canusb->dev = NULL;
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}
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if (canusb->ctx)
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{
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libusb_exit(canusb->ctx);
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canusb->ctx = NULL;
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}
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}
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static int canusb_activate(pcap_t* handle)
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{
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struct pcap_canusb *canusb = handle->priv;
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char *serial;
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if (libusb_init(&canusb->ctx) != 0) {
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/*
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* XXX - what causes this to fail?
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*/
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snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "libusb_init() failed");
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return PCAP_ERROR;
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}
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handle->read_op = canusb_read_linux;
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handle->inject_op = canusb_inject_linux;
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handle->setfilter_op = canusb_setfilter_linux;
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handle->setdirection_op = canusb_setdirection_linux;
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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 = canusb_stats_linux;
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handle->cleanup_op = canusb_close;
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/* Initialize some components of the pcap structure. */
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handle->bufsize = 32;
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handle->offset = 8;
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handle->linktype = DLT_CAN_SOCKETCAN;
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handle->set_datalink_op = NULL;
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serial = handle->opt.source + strlen(CANUSB_IFACE);
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canusb->dev = canusb_opendevice(canusb->ctx, serial);
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if (!canusb->dev)
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{
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libusb_exit(canusb->ctx);
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snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't open USB Device");
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return PCAP_ERROR;
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}
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canusb_clearbufs(canusb);
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handle->fd = canusb_startcapture(canusb);
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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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canusb_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user)
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{
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static struct timeval firstpacket = { -1, -1};
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int i = 0;
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struct CAN_Msg msg;
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struct pcap_pkthdr pkth;
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while(i < max_packets)
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{
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int n;
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usleep(10 * 1000);
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n = read(handle->fd, &msg, sizeof(msg));
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if (n <= 0)
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break;
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pkth.caplen = pkth.len = n;
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pkth.caplen -= 4;
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pkth.caplen -= 8 - msg.length;
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if ((firstpacket.tv_sec == -1) && (firstpacket.tv_usec == -1))
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gettimeofday(&firstpacket, NULL);
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pkth.ts.tv_usec = firstpacket.tv_usec + (msg.timestamp % 100) * 10000;
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pkth.ts.tv_sec = firstpacket.tv_usec + (msg.timestamp / 100);
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if (pkth.ts.tv_usec > 1000000)
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{
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pkth.ts.tv_usec -= 1000000;
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pkth.ts.tv_sec++;
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}
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callback(user, &pkth, (void*)&msg.id);
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i++;
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}
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return i;
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}
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static int
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canusb_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 canusb devices");
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return (-1);
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}
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static int
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canusb_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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canusb_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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canusb_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 this interface");
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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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