2 * Copyright (c) 2009 Felix Obenhuber
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6 * modification, are permitted provided that the following conditions
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30 * Sockettrace sniffing API implementation for Linux platform
31 * By Felix Obenhuber <felix@obenhuber.de>
39 #include <libusb-1.0/libusb.h>
48 #define CANUSB_IFACE "canusb"
50 #define CANUSB_VID 0x0403
51 #define CANUSB_PID 0x8990
60 /* forward declaration */
61 static int canusb_activate(pcap_t *);
62 static int canusb_read_linux(pcap_t *, int , pcap_handler , u_char *);
63 static int canusb_inject_linux(pcap_t *, const void *, size_t);
64 static int canusb_setfilter_linux(pcap_t *, struct bpf_program *);
65 static int canusb_setdirection_linux(pcap_t *, pcap_direction_t);
66 static int canusb_stats_linux(pcap_t *, struct pcap_stat *);
79 libusb_device_handle *dev;
86 static struct canusb_t canusb;
87 static volatile int loop;
89 int canusb_findalldevs(pcap_if_t **alldevsp, char *err_str)
91 libusb_context *fdctx;
93 unsigned char sernum[65];
94 unsigned char buf[96];
97 if (libusb_init(&fdctx) != 0) {
99 * XXX - if this doesn't just mean "no USB file system mounted",
100 * perhaps we should report a real error rather than just
101 * saying "no CANUSB devices".
106 cnt = libusb_get_device_list(fdctx,&devs);
111 // Check if this device is interesting.
112 struct libusb_device_descriptor desc;
113 libusb_get_device_descriptor(devs[i],&desc);
115 if ((desc.idVendor != CANUSB_VID) || (desc.idProduct != CANUSB_PID))
116 continue; //It is not, check next device
119 libusb_device_handle *dh = NULL;
121 if (ret = libusb_open(devs[i],&dh) == 0)
125 int n = libusb_get_string_descriptor_ascii(dh,desc.iSerialNumber,sernum,64);
128 snprintf(dev_name, 30, CANUSB_IFACE"%s", sernum);
129 snprintf(dev_descr, 50, "CanUSB [%s]", sernum);
133 if (pcap_add_if(alldevsp, dev_name, 0, dev_descr, err_str) < 0)
135 libusb_free_device_list(devs,1);
141 libusb_free_device_list(devs,1);
146 static libusb_device_handle* canusb_opendevice(struct libusb_context *ctx, char* devserial)
148 libusb_device_handle* dh;
149 libusb_device** devs;
150 unsigned char serial[65];
153 cnt = libusb_get_device_list(ctx,&devs);
157 // Check if this device is interesting.
158 struct libusb_device_descriptor desc;
159 libusb_get_device_descriptor(devs[i],&desc);
161 if ((desc.idVendor != CANUSB_VID) || (desc.idProduct != CANUSB_PID))
165 libusb_device_handle *dh = NULL;
167 if (libusb_open(devs[i],&dh) != 0) continue;
169 n = libusb_get_string_descriptor_ascii(dh,desc.iSerialNumber,serial,64);
172 if ((devserial) && (strcmp(serial,devserial) != 0))
178 if ((libusb_kernel_driver_active(dh,0)) && (libusb_detach_kernel_driver(dh,0) != 0))
184 if (libusb_set_configuration(dh,1) != 0)
190 if (libusb_claim_interface(dh,0) != 0)
197 libusb_free_device_list(devs,1);
201 libusb_free_device_list(devs,1);
207 canusb_create(const char *device, char *ebuf, int *is_ours)
214 libusb_init(&canusb.ctx);
216 /* Does this look like a DAG device? */
217 cp = strrchr(device, '/');
220 /* Does it begin with "canusb"? */
221 if (strncmp(cp, "canusb", 6) != 0) {
222 /* Nope, doesn't begin with "canusb" */
226 /* Yes - is "canusb" followed by a number? */
228 devnum = strtol(cp, &cpend, 10);
229 if (cpend == cp || *cpend != '\0') {
230 /* Not followed by a number. */
235 /* Followed by a non-valid number. */
240 /* OK, it's probably ours. */
243 p = pcap_create_common(device, ebuf);
247 memset(&canusb, 0x00, sizeof(canusb));
249 p->activate_op = canusb_activate;
255 static void* canusb_capture_thread(struct canusb_t *canusb)
257 struct libusb_context *ctx;
258 libusb_device_handle *dev;
268 serial = canusb->serial;
269 dev = canusb_opendevice(ctx, serial);
271 fcntl(canusb->wrpipe, F_SETFL, O_NONBLOCK);
278 libusb_interrupt_transfer(dev, 0x81, (unsigned char*)&status, sizeof(status), &sz, 100);
279 //HACK!!!!! -> drop buffered data, read new one by reading twice.
280 ret = libusb_interrupt_transfer(dev, 0x81, (unsigned char*)&status, sizeof(status), &sz, 100);
282 for(i = 0; i<status.rxsz; i++)
284 libusb_bulk_transfer(dev, 0x85, (unsigned char*)&msg, sizeof(msg), &sz, 100);
285 n = write(canusb->wrpipe, &msg, sizeof(msg));
296 static int canusb_startcapture(struct canusb_t* this)
300 if (pipe(pipefd) == -1)
303 canusb.rdpipe = pipefd[0];
304 canusb.wrpipe = pipefd[1];
308 pthread_create(&this->worker, NULL, canusb_capture_thread, &canusb);
310 return canusb.rdpipe;
313 static void canusb_clearbufs(struct canusb_t* this)
315 unsigned char cmd[16];
318 cmd[0] = 1; //Empty incoming buffer
319 cmd[1] = 1; //Empty outgoing buffer
320 cmd[3] = 0; //Not a write to serial number
321 memset(&cmd[4],0,16-4);
323 libusb_interrupt_transfer(this->dev, 0x1,cmd,16,&al,100);
327 static void canusb_close(pcap_t* handle)
330 pthread_join(canusb.worker, NULL);
334 libusb_close(canusb.dev);
341 static int canusb_activate(pcap_t* handle)
345 handle->read_op = canusb_read_linux;
347 handle->inject_op = canusb_inject_linux;
348 handle->setfilter_op = canusb_setfilter_linux;
349 handle->setdirection_op = canusb_setdirection_linux;
350 handle->getnonblock_op = pcap_getnonblock_fd;
351 handle->setnonblock_op = pcap_setnonblock_fd;
352 handle->stats_op = canusb_stats_linux;
353 handle->cleanup_op = canusb_close;
355 /* Initialize some components of the pcap structure. */
356 handle->bufsize = 32;
358 handle->linktype = DLT_CAN_SOCKETCAN;
359 handle->set_datalink_op = NULL;
361 serial = handle->opt.source + strlen(CANUSB_IFACE);
362 canusb.serial = strdup(serial);
364 canusb.dev = canusb_opendevice(canusb.ctx,serial);
367 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't open USB Device:");
371 canusb_clearbufs(&canusb);
373 handle->fd = canusb_startcapture(&canusb);
374 handle->selectable_fd = handle->fd;
383 canusb_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user)
385 static struct timeval firstpacket = { -1, -1};
390 struct pcap_pkthdr pkth;
392 while(i < max_packets)
396 n = read(handle->fd, &msg, sizeof(msg));
399 pkth.caplen = pkth.len = n;
401 pkth.caplen -= 8 - msg.length;
403 if ((firstpacket.tv_sec == -1) && (firstpacket.tv_usec == -1))
404 gettimeofday(&firstpacket, NULL);
406 pkth.ts.tv_usec = firstpacket.tv_usec + (msg.timestamp % 100) * 10000;
407 pkth.ts.tv_sec = firstpacket.tv_usec + (msg.timestamp / 100);
408 if (pkth.ts.tv_usec > 1000000)
410 pkth.ts.tv_usec -= 1000000;
414 callback(user, &pkth, (void*)&msg.id);
423 canusb_inject_linux(pcap_t *handle, const void *buf, size_t size)
425 /* not yet implemented */
426 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported on canusb devices");
432 canusb_stats_linux(pcap_t *handle, struct pcap_stat *stats)
434 /* not yet implemented */
435 stats->ps_recv = 0; /* number of packets received */
436 stats->ps_drop = 0; /* number of packets dropped */
437 stats->ps_ifdrop = 0; /* drops by interface -- only supported on some platforms */
443 canusb_setfilter_linux(pcap_t *p, struct bpf_program *fp)
445 /* not yet implemented */
451 canusb_setdirection_linux(pcap_t *p, pcap_direction_t d)
453 /* no support for PCAP_D_OUT */
456 snprintf(p->errbuf, sizeof(p->errbuf),
457 "Setting direction to PCAP_D_OUT is not supported on this interface");