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-rw-r--r--pcap-canusb-linux.c472
1 files changed, 0 insertions, 472 deletions
diff --git a/pcap-canusb-linux.c b/pcap-canusb-linux.c
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--- a/pcap-canusb-linux.c
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-/*
- * 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.
- *
- * Sockettrace sniffing API implementation for Linux platform
- * By Felix Obenhuber <felix@obenhuber.de>
- *
- */
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <libusb-1.0/libusb.h>
-
-#include <stdlib.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <string.h>
-#include <pthread.h>
-
-#include "pcap-int.h"
-#include "pcap-canusb-linux.h"
-
-#define CANUSB_IFACE "canusb"
-
-#define CANUSB_VID 0x0403
-#define CANUSB_PID 0x8990
-
-#define USE_THREAD 1
-
-#if USE_THREAD == 0
-#include <signal.h>
-#endif
-
-
-/* forward declaration */
-static int canusb_activate(pcap_t *);
-static int canusb_read_linux(pcap_t *, int , pcap_handler , u_char *);
-static int canusb_inject_linux(pcap_t *, const void *, size_t);
-static int canusb_setfilter_linux(pcap_t *, struct bpf_program *);
-static int canusb_setdirection_linux(pcap_t *, pcap_direction_t);
-static int canusb_stats_linux(pcap_t *, struct pcap_stat *);
-
-struct CAN_Msg
-{
- uint32_t timestamp;
- uint32_t id;
- uint32_t length;
- uint8_t data[8];
-};
-
-/*
- * Private data for capturing on Linux CANbus USB devices.
- */
-struct pcap_canusb {
- libusb_context *ctx;
- libusb_device_handle *dev;
- pthread_t worker;
- int rdpipe, wrpipe;
- volatile int loop;
-};
-
-int canusb_findalldevs(pcap_if_t **alldevsp, char *err_str)
-{
- libusb_context *fdctx;
- libusb_device** devs;
- unsigned char sernum[65];
- int cnt, i;
-
- if (libusb_init(&fdctx) != 0) {
- /*
- * XXX - if this doesn't just mean "no USB file system mounted",
- * perhaps we should report a real error rather than just
- * saying "no CANUSB devices".
- */
- return 0;
- }
-
- cnt = libusb_get_device_list(fdctx,&devs);
-
- for(i=0;i<cnt;i++)
- {
- int ret;
- // Check if this device is interesting.
- struct libusb_device_descriptor desc;
- libusb_get_device_descriptor(devs[i],&desc);
-
- if ((desc.idVendor != CANUSB_VID) || (desc.idProduct != CANUSB_PID))
- continue; //It is not, check next device
-
- //It is!
- libusb_device_handle *dh = NULL;
-
- if ((ret = libusb_open(devs[i],&dh)) == 0)
- {
- char dev_name[30];
- char dev_descr[50];
- int n = libusb_get_string_descriptor_ascii(dh,desc.iSerialNumber,sernum,64);
- sernum[n] = 0;
-
- snprintf(dev_name, 30, CANUSB_IFACE"%s", sernum);
- snprintf(dev_descr, 50, "CanUSB [%s]", sernum);
-
- libusb_close(dh);
-
- if (pcap_add_if(alldevsp, dev_name, 0, dev_descr, err_str) < 0)
- {
- libusb_free_device_list(devs,1);
- libusb_exit(fdctx);
- return -1;
- }
- }
- }
-
- libusb_free_device_list(devs,1);
- libusb_exit(fdctx);
- return 0;
-}
-
-static libusb_device_handle* canusb_opendevice(struct libusb_context *ctx, char* devserial)
-{
- libusb_device** devs;
- unsigned char serial[65];
- int cnt,i,n;
-
- cnt = libusb_get_device_list(ctx,&devs);
-
- for(i=0;i<cnt;i++)
- {
- // Check if this device is interesting.
- struct libusb_device_descriptor desc;
- libusb_get_device_descriptor(devs[i],&desc);
-
- if ((desc.idVendor != CANUSB_VID) || (desc.idProduct != CANUSB_PID))
- continue;
-
- //Found one!
- libusb_device_handle *dh = NULL;
-
- if (libusb_open(devs[i],&dh) != 0) continue;
-
- n = libusb_get_string_descriptor_ascii(dh,desc.iSerialNumber,serial,64);
- serial[n] = 0;
-
- if ((devserial) && (strcmp((char *)serial,devserial) != 0))
- {
- libusb_close(dh);
- continue;
- }
-
- if ((libusb_kernel_driver_active(dh,0)) && (libusb_detach_kernel_driver(dh,0) != 0))
- {
- libusb_close(dh);
- continue;
- }
-
- if (libusb_set_configuration(dh,1) != 0)
- {
- libusb_close(dh);
- continue;
- }
-
- if (libusb_claim_interface(dh,0) != 0)
- {
- libusb_close(dh);
- continue;
- }
-
- //Fount it!
- libusb_free_device_list(devs,1);
- return dh;
- }
-
- libusb_free_device_list(devs,1);
- return NULL;
-}
-
-
-pcap_t *
-canusb_create(const char *device, char *ebuf, int *is_ours)
-{
- const char *cp;
- char *cpend;
- long devnum;
- pcap_t* p;
- struct pcap_canusb *canusb;
-
- /* Does this look like a DAG device? */
- cp = strrchr(device, '/');
- if (cp == NULL)
- cp = device;
- /* Does it begin with "canusb"? */
- if (strncmp(cp, "canusb", 6) != 0) {
- /* Nope, doesn't begin with "canusb" */
- *is_ours = 0;
- return NULL;
- }
- /* Yes - is "canusb" followed by a number? */
- cp += 6;
- 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_canusb));
- if (p == NULL)
- return (NULL);
-
- canusb = p->priv;
- canusb->ctx = NULL;
- canusb->dev = NULL;
- canusb->rdpipe = -1;
- canusb->wrpipe = -1;
-
- p->activate_op = canusb_activate;
-
- return (p);
-}
-
-
-static void* canusb_capture_thread(void *arg)
-{
- struct pcap_canusb *canusb = arg;
- int i;
- struct
- {
- uint8_t rxsz, txsz;
- } status;
-
- fcntl(canusb->wrpipe, F_SETFL, O_NONBLOCK);
-
- while(canusb->loop)
- {
- int sz;
- struct CAN_Msg msg;
-
- libusb_interrupt_transfer(canusb->dev, 0x81, (unsigned char*)&status, sizeof(status), &sz, 100);
- //HACK!!!!! -> drop buffered data, read new one by reading twice.
- libusb_interrupt_transfer(canusb->dev, 0x81, (unsigned char*)&status, sizeof(status), &sz, 100);
-
- for(i = 0; i<status.rxsz; i++)
- {
- libusb_bulk_transfer(canusb->dev, 0x85, (unsigned char*)&msg, sizeof(msg), &sz, 100);
- write(canusb->wrpipe, &msg, sizeof(msg));
- }
-
- }
-
- return NULL;
-}
-
-static int canusb_startcapture(struct pcap_canusb* this)
-{
- int pipefd[2];
-
- if (pipe(pipefd) == -1)
- return -1;
-
- this->rdpipe = pipefd[0];
- this->wrpipe = pipefd[1];
-
- this->loop = 1;
- pthread_create(&this->worker, NULL, canusb_capture_thread, this);
-
- return this->rdpipe;
-}
-
-static void canusb_clearbufs(struct pcap_canusb* this)
-{
- unsigned char cmd[16];
- int al;
-
- cmd[0] = 1; //Empty incoming buffer
- cmd[1] = 1; //Empty outgoing buffer
- cmd[3] = 0; //Not a write to serial number
- memset(&cmd[4],0,16-4);
-
- libusb_interrupt_transfer(this->dev, 0x1,cmd,16,&al,100);
-}
-
-
-static void canusb_close(pcap_t* handle)
-{
- struct pcap_canusb *canusb = handle->priv;
-
- canusb->loop = 0;
- pthread_join(canusb->worker, NULL);
-
- if (canusb->dev)
- {
- libusb_close(canusb->dev);
- canusb->dev = NULL;
- }
- if (canusb->ctx)
- {
- libusb_exit(canusb->ctx);
- canusb->ctx = NULL;
- }
-}
-
-
-
-static int canusb_activate(pcap_t* handle)
-{
- struct pcap_canusb *canusb = handle->priv;
- char *serial;
-
- if (libusb_init(&canusb->ctx) != 0) {
- /*
- * XXX - what causes this to fail?
- */
- snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "libusb_init() failed");
- return PCAP_ERROR;
- }
-
- handle->read_op = canusb_read_linux;
-
- handle->inject_op = canusb_inject_linux;
- handle->setfilter_op = canusb_setfilter_linux;
- handle->setdirection_op = canusb_setdirection_linux;
- handle->getnonblock_op = pcap_getnonblock_fd;
- handle->setnonblock_op = pcap_setnonblock_fd;
- handle->stats_op = canusb_stats_linux;
- handle->cleanup_op = canusb_close;
-
- /* Initialize some components of the pcap structure. */
- handle->bufsize = 32;
- handle->offset = 8;
- handle->linktype = DLT_CAN_SOCKETCAN;
- handle->set_datalink_op = NULL;
-
- serial = handle->opt.source + strlen(CANUSB_IFACE);
-
- canusb->dev = canusb_opendevice(canusb->ctx, serial);
- if (!canusb->dev)
- {
- libusb_exit(canusb->ctx);
- snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't open USB Device");
- return PCAP_ERROR;
- }
-
- canusb_clearbufs(canusb);
-
- handle->fd = canusb_startcapture(canusb);
- handle->selectable_fd = handle->fd;
-
- return 0;
-}
-
-
-
-
-static int
-canusb_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user)
-{
- static struct timeval firstpacket = { -1, -1};
- int i = 0;
- struct CAN_Msg msg;
- struct pcap_pkthdr pkth;
-
- while(i < max_packets)
- {
- int n;
- usleep(10 * 1000);
- n = read(handle->fd, &msg, sizeof(msg));
- if (n <= 0)
- break;
- pkth.caplen = pkth.len = n;
- pkth.caplen -= 4;
- pkth.caplen -= 8 - msg.length;
-
- if ((firstpacket.tv_sec == -1) && (firstpacket.tv_usec == -1))
- gettimeofday(&firstpacket, NULL);
-
- pkth.ts.tv_usec = firstpacket.tv_usec + (msg.timestamp % 100) * 10000;
- pkth.ts.tv_sec = firstpacket.tv_usec + (msg.timestamp / 100);
- if (pkth.ts.tv_usec > 1000000)
- {
- pkth.ts.tv_usec -= 1000000;
- pkth.ts.tv_sec++;
- }
-
- callback(user, &pkth, (void*)&msg.id);
- i++;
- }
-
- return i;
-}
-
-
-static int
-canusb_inject_linux(pcap_t *handle, const void *buf, size_t size)
-{
- /* not yet implemented */
- snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported on canusb devices");
- return (-1);
-}
-
-
-static int
-canusb_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
-canusb_setfilter_linux(pcap_t *p, struct bpf_program *fp)
-{
- /* not yet implemented */
- return 0;
-}
-
-
-static int
-canusb_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 this interface");
- return -1;
- }
-
- p->direction = d;
-
- return 0;
-}
-
-
-/* eof */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-25 10:35:12 +0000