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/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
/*
* candump.c
*
* Copyright (c) 2002-2009 Volkswagen Group Electronic Research
* 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. Neither the name of Volkswagen nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* Alternatively, provided that this notice is retained in full, this
* software may be distributed under the terms of the GNU General
* Public License ("GPL") version 2, in which case the provisions of the
* GPL apply INSTEAD OF those given above.
*
* The provided data structures and external interfaces from this code
* are not restricted to be used by modules with a GPL compatible license.
*
* 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.
*
* Send feedback to <linux-can@vger.kernel.org>
*
*/
#include <ctype.h>
#include <errno.h>
#include <libgen.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <net/if.h>
#include <sys/epoll.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <linux/can.h>
#include <linux/can/raw.h>
#include <linux/net_tstamp.h>
#include "terminal.h"
#include "lib.h"
/* for hardware timestamps - since Linux 2.6.30 */
#ifndef SO_TIMESTAMPING
#define SO_TIMESTAMPING 37
#endif
#define TIMESTAMPSZ 50 /* string 'absolute with date' requires max 49 bytes */
#define MAXSOCK 16 /* max. number of CAN interfaces given on the cmdline */
#define MAXIFNAMES 30 /* size of receive name index to omit ioctls */
#define MAXCOL 6 /* number of different colors for colorized output */
#define ANYDEV "any" /* name of interface to receive from any CAN interface */
#define ANL "\r\n" /* newline in ASC mode */
#define SILENT_INI 42 /* detect user setting on commandline */
#define SILENT_OFF 0 /* no silent mode */
#define SILENT_ANI 1 /* silent mode with animation */
#define SILENT_ON 2 /* silent mode (completely silent) */
#define BOLD ATTBOLD
#define RED (ATTBOLD FGRED)
#define GREEN (ATTBOLD FGGREEN)
#define YELLOW (ATTBOLD FGYELLOW)
#define BLUE (ATTBOLD FGBLUE)
#define MAGENTA (ATTBOLD FGMAGENTA)
#define CYAN (ATTBOLD FGCYAN)
static const char col_on[MAXCOL][19] = { BLUE, RED, GREEN, BOLD, MAGENTA, CYAN };
static const char col_off[] = ATTRESET;
struct if_info { /* bundled information per open socket */
int s; /* socket */
char *cmdlinename;
__u32 dropcnt;
__u32 last_dropcnt;
};
static struct if_info sock_info[MAXSOCK];
static char *progname;
static char devname[MAXIFNAMES][IFNAMSIZ + 1];
static int dindex[MAXIFNAMES];
static int max_devname_len; /* to prevent frazzled device name output */
static const int canfd_on = 1;
#define MAXANI 4
static const char anichar[MAXANI] = { '|', '/', '-', '\\' };
static const char extra_m_info[4][4] = { "- -", "B -", "- E", "B E" };
extern int optind, opterr, optopt;
static volatile int running = 1;
static volatile sig_atomic_t signal_num;
static void print_usage(void)
{
fprintf(stderr, "%s - dump CAN bus traffic.\n", progname);
fprintf(stderr, "\nUsage: %s [options] <CAN interface>+\n", progname);
fprintf(stderr, " (use CTRL-C to terminate %s)\n\n", progname);
fprintf(stderr, "Options:\n");
fprintf(stderr, " -t <type> (timestamp: (a)bsolute/(d)elta/(z)ero/(A)bsolute w date)\n");
fprintf(stderr, " -H (read hardware timestamps instead of system timestamps)\n");
fprintf(stderr, " -c (increment color mode level)\n");
fprintf(stderr, " -i (binary output - may exceed 80 chars/line)\n");
fprintf(stderr, " -a (enable additional ASCII output)\n");
fprintf(stderr, " -S (swap byte order in printed CAN data[] - marked with '%c' )\n", SWAP_DELIMITER);
fprintf(stderr, " -s <level> (silent mode - %d: off (default) %d: animation %d: silent)\n", SILENT_OFF, SILENT_ANI, SILENT_ON);
fprintf(stderr, " -l (log CAN-frames into file. Sets '-s %d' by default)\n", SILENT_ON);
fprintf(stderr, " -f <fname> (log CAN-frames into file <fname>. Sets '-s %d' by default)\n", SILENT_ON);
fprintf(stderr, " -L (use log file format on stdout)\n");
fprintf(stderr, " -n <count> (terminate after reception of <count> CAN frames)\n");
fprintf(stderr, " -r <size> (set socket receive buffer to <size>)\n");
fprintf(stderr, " -D (Don't exit if a \"detected\" can device goes down)\n");
fprintf(stderr, " -d (monitor dropped CAN frames)\n");
fprintf(stderr, " -e (dump CAN error frames in human-readable format)\n");
fprintf(stderr, " -8 (display raw DLC values in {} for Classical CAN)\n");
fprintf(stderr, " -x (print extra message infos, rx/tx brs esi)\n");
fprintf(stderr, " -T <msecs> (terminate after <msecs> if no frames were received)\n");
fprintf(stderr, "\n");
fprintf(stderr, "Up to %d CAN interfaces with optional filter sets can be specified\n", MAXSOCK);
fprintf(stderr, "on the commandline in the form: <ifname>[,filter]*\n");
fprintf(stderr, "\nFilters:\n");
fprintf(stderr, " Comma separated filters can be specified for each given CAN interface:\n");
fprintf(stderr, " <can_id>:<can_mask>\n (matches when <received_can_id> & mask == can_id & mask)\n");
fprintf(stderr, " <can_id>~<can_mask>\n (matches when <received_can_id> & mask != can_id & mask)\n");
fprintf(stderr, " #<error_mask>\n (set error frame filter, see include/linux/can/error.h)\n");
fprintf(stderr, " [j|J]\n (join the given CAN filters - logical AND semantic)\n");
fprintf(stderr, "\nCAN IDs, masks and data content are given and expected in hexadecimal values.\n");
fprintf(stderr, "When the can_id is 8 digits long the CAN_EFF_FLAG is set for 29 bit EFF format.\n");
fprintf(stderr, "Without any given filter all data frames are received ('0:0' default filter).\n");
fprintf(stderr, "\nUse interface name '%s' to receive from all CAN interfaces.\n", ANYDEV);
fprintf(stderr, "\nExamples:\n");
fprintf(stderr, "%s -c -c -ta can0,123:7FF,400:700,#000000FF can2,400~7F0 can3 can8\n\n", progname);
fprintf(stderr, "%s -l any,0~0,#FFFFFFFF\n (log only error frames but no(!) data frames)\n", progname);
fprintf(stderr, "%s -l any,0:0,#FFFFFFFF\n (log error frames and also all data frames)\n", progname);
fprintf(stderr, "%s vcan2,12345678:DFFFFFFF\n (match only for extended CAN ID 12345678)\n", progname);
fprintf(stderr, "%s vcan2,123:7FF\n (matches CAN ID 123 - including EFF and RTR frames)\n", progname);
fprintf(stderr, "%s vcan2,123:C00007FF\n (matches CAN ID 123 - only SFF and non-RTR frames)\n", progname);
fprintf(stderr, "\n");
}
static void sigterm(int signo)
{
running = 0;
signal_num = signo;
}
static int idx2dindex(int ifidx, int socket)
{
int i;
struct ifreq ifr;
for (i = 0; i < MAXIFNAMES; i++) {
if (dindex[i] == ifidx)
return i;
}
/* create new interface index cache entry */
/* remove index cache zombies first */
for (i = 0; i < MAXIFNAMES; i++) {
if (dindex[i]) {
ifr.ifr_ifindex = dindex[i];
if (ioctl(socket, SIOCGIFNAME, &ifr) < 0)
dindex[i] = 0;
}
}
for (i = 0; i < MAXIFNAMES; i++)
if (!dindex[i]) /* free entry */
break;
if (i == MAXIFNAMES) {
fprintf(stderr, "Interface index cache only supports %d interfaces.\n",
MAXIFNAMES);
exit(1);
}
dindex[i] = ifidx;
ifr.ifr_ifindex = ifidx;
if (ioctl(socket, SIOCGIFNAME, &ifr) < 0)
perror("SIOCGIFNAME");
if (max_devname_len < (int)strlen(ifr.ifr_name))
max_devname_len = strlen(ifr.ifr_name);
strcpy(devname[i], ifr.ifr_name);
pr_debug("new index %d (%s)\n", i, devname[i]);
return i;
}
static inline void sprint_timestamp(const char timestamp, const struct timeval *tv,
struct timeval *const last_tv, char *ts_buffer)
{
switch (timestamp) {
case 'a': /* absolute with timestamp */
sprintf(ts_buffer, "(%010llu.%06llu) ", (unsigned long long)tv->tv_sec, (unsigned long long)tv->tv_usec);
break;
case 'A': /* absolute with date */
{
struct tm tm;
char timestring[25];
tm = *localtime(&tv->tv_sec);
strftime(timestring, 24, "%Y-%m-%d %H:%M:%S", &tm);
sprintf(ts_buffer, "(%s.%06llu) ", timestring, (unsigned long long)tv->tv_usec);
}
break;
case 'd': /* delta */
case 'z': /* starting with zero */
{
struct timeval diff;
if (last_tv->tv_sec == 0) /* first init */
*last_tv = *tv;
diff.tv_sec = tv->tv_sec - last_tv->tv_sec;
diff.tv_usec = tv->tv_usec - last_tv->tv_usec;
if (diff.tv_usec < 0)
diff.tv_sec--, diff.tv_usec += 1000000;
if (diff.tv_sec < 0)
diff.tv_sec = diff.tv_usec = 0;
sprintf(ts_buffer, "(%03llu.%06llu) ", (unsigned long long)diff.tv_sec, (unsigned long long)diff.tv_usec);
if (timestamp == 'd')
*last_tv = *tv; /* update for delta calculation */
}
break;
default: /* no timestamp output */
break;
}
}
static inline void print_timestamp(const char timestamp, const struct timeval *tv,
struct timeval *const last_tv)
{
static char buffer[TIMESTAMPSZ];
sprint_timestamp(timestamp, tv, last_tv, buffer);
printf("%s", buffer);
}
int main(int argc, char **argv)
{
int fd_epoll;
struct epoll_event events_pending[MAXSOCK];
struct epoll_event event_setup = {
.events = EPOLLIN, /* prepare the common part */
};
unsigned char timestamp = 0;
unsigned char logtimestamp = 'a';
unsigned char hwtimestamp = 0;
unsigned char down_causes_exit = 1;
unsigned char dropmonitor = 0;
unsigned char extra_msg_info = 0;
unsigned char silent = SILENT_INI;
unsigned char silentani = 0;
unsigned char color = 0;
unsigned char view = 0;
unsigned char log = 0;
unsigned char logfrmt = 0;
int count = 0;
int rcvbuf_size = 0;
int opt, num_events;
int currmax, numfilter;
int join_filter;
char *ptr, *nptr;
struct sockaddr_can addr = {
.can_family = AF_CAN,
};
char ctrlmsg[CMSG_SPACE(sizeof(struct timeval)) +
CMSG_SPACE(3 * sizeof(struct timespec)) +
CMSG_SPACE(sizeof(__u32))];
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsg;
struct can_filter *rfilter;
can_err_mask_t err_mask;
struct canfd_frame frame;
int nbytes, i, maxdlen;
struct ifreq ifr;
struct timeval tv, last_tv;
int timeout_ms = -1; /* default to no timeout */
FILE *logfile = NULL;
char fname[83]; /* suggested by -Wformat-overflow= */
const char *logname = NULL;
signal(SIGTERM, sigterm);
signal(SIGHUP, sigterm);
signal(SIGINT, sigterm);
last_tv.tv_sec = 0;
last_tv.tv_usec = 0;
progname = basename(argv[0]);
while ((opt = getopt(argc, argv, "t:HciaSs:lf:Ln:r:Dde8xT:h?")) != -1) {
switch (opt) {
case 't':
timestamp = optarg[0];
logtimestamp = optarg[0];
if ((timestamp != 'a') && (timestamp != 'A') &&
(timestamp != 'd') && (timestamp != 'z')) {
fprintf(stderr, "%s: unknown timestamp mode '%c' - ignored\n",
progname, optarg[0]);
timestamp = 0;
}
if ((logtimestamp != 'a') && (logtimestamp != 'z')) {
logtimestamp = 'a';
}
break;
case 'H':
hwtimestamp = 1;
break;
case 'c':
color++;
break;
case 'i':
view |= CANLIB_VIEW_BINARY;
break;
case 'a':
view |= CANLIB_VIEW_ASCII;
break;
case 'S':
view |= CANLIB_VIEW_SWAP;
break;
case 'e':
view |= CANLIB_VIEW_ERROR;
break;
case '8':
view |= CANLIB_VIEW_LEN8_DLC;
break;
case 's':
silent = atoi(optarg);
if (silent > SILENT_ON) {
print_usage();
exit(1);
}
break;
case 'l':
log = 1;
break;
case 'D':
down_causes_exit = 0;
break;
case 'd':
dropmonitor = 1;
break;
case 'x':
extra_msg_info = 1;
break;
case 'L':
logfrmt = 1;
break;
case 'f':
logname = optarg;
log = 1;
break;
case 'n':
count = atoi(optarg);
if (count < 1) {
print_usage();
exit(1);
}
break;
case 'r':
rcvbuf_size = atoi(optarg);
if (rcvbuf_size < 1) {
print_usage();
exit(1);
}
break;
case 'T':
errno = 0;
timeout_ms = strtol(optarg, NULL, 0);
if (errno != 0) {
print_usage();
exit(1);
}
break;
default:
print_usage();
exit(1);
break;
}
}
if (optind == argc) {
print_usage();
exit(0);
}
if (logfrmt && view) {
fprintf(stderr, "Log file format selected: Please disable ASCII/BINARY/SWAP/RAWDLC options!\n");
exit(0);
}
/* "-f -" is equal to "-L" (print logfile format on stdout) */
if (log && logname && strcmp("-", logname) == 0) {
log = 0; /* no logging into a file */
logfrmt = 1; /* print logformat output to stdout */
}
if (silent == SILENT_INI) {
if (log) {
fprintf(stderr, "Disabled standard output while logging.\n");
silent = SILENT_ON; /* disable output on stdout */
} else
silent = SILENT_OFF; /* default output */
}
currmax = argc - optind; /* find real number of CAN devices */
if (currmax > MAXSOCK) {
fprintf(stderr, "More than %d CAN devices given on commandline!\n", MAXSOCK);
return 1;
}
fd_epoll = epoll_create(1);
if (fd_epoll < 0) {
perror("epoll_create");
return 1;
}
for (i = 0; i < currmax; i++) {
struct if_info *obj = &sock_info[i];
ptr = argv[optind + i];
nptr = strchr(ptr, ',');
pr_debug("open %d '%s'.\n", i, ptr);
obj->s = socket(PF_CAN, SOCK_RAW, CAN_RAW);
if (obj->s < 0) {
perror("socket");
return 1;
}
event_setup.data.ptr = obj; /* remember the instance as private data */
if (epoll_ctl(fd_epoll, EPOLL_CTL_ADD, obj->s, &event_setup)) {
perror("failed to add socket to epoll");
return 1;
}
obj->cmdlinename = ptr; /* save pointer to cmdline name of this socket */
if (nptr)
nbytes = nptr - ptr; /* interface name is up the first ',' */
else
nbytes = strlen(ptr); /* no ',' found => no filter definitions */
if (nbytes >= IFNAMSIZ) {
fprintf(stderr, "name of CAN device '%s' is too long!\n", ptr);
return 1;
}
if (nbytes > max_devname_len)
max_devname_len = nbytes; /* for nice printing */
memset(&ifr.ifr_name, 0, sizeof(ifr.ifr_name));
strncpy(ifr.ifr_name, ptr, nbytes);
pr_debug("using interface name '%s'.\n", ifr.ifr_name);
if (strcmp(ANYDEV, ifr.ifr_name) != 0) {
if (ioctl(obj->s, SIOCGIFINDEX, &ifr) < 0) {
perror("SIOCGIFINDEX");
exit(1);
}
addr.can_ifindex = ifr.ifr_ifindex;
} else
addr.can_ifindex = 0; /* any can interface */
if (nptr) {
/* found a ',' after the interface name => check for filters */
/* determine number of filters to alloc the filter space */
numfilter = 0;
ptr = nptr;
while (ptr) {
numfilter++;
ptr++; /* hop behind the ',' */
ptr = strchr(ptr, ','); /* exit condition */
}
rfilter = malloc(sizeof(struct can_filter) * numfilter);
if (!rfilter) {
fprintf(stderr, "Failed to create filter space!\n");
return 1;
}
numfilter = 0;
err_mask = 0;
join_filter = 0;
while (nptr) {
ptr = nptr + 1; /* hop behind the ',' */
nptr = strchr(ptr, ','); /* update exit condition */
if (sscanf(ptr, "%x:%x",
&rfilter[numfilter].can_id,
&rfilter[numfilter].can_mask) == 2) {
rfilter[numfilter].can_mask &= ~CAN_ERR_FLAG;
if (*(ptr + 8) == ':')
rfilter[numfilter].can_id |= CAN_EFF_FLAG;
numfilter++;
} else if (sscanf(ptr, "%x~%x",
&rfilter[numfilter].can_id,
&rfilter[numfilter].can_mask) == 2) {
rfilter[numfilter].can_id |= CAN_INV_FILTER;
rfilter[numfilter].can_mask &= ~CAN_ERR_FLAG;
if (*(ptr + 8) == '~')
rfilter[numfilter].can_id |= CAN_EFF_FLAG;
numfilter++;
} else if (*ptr == 'j' || *ptr == 'J') {
join_filter = 1;
} else if (sscanf(ptr, "#%x", &err_mask) != 1) {
fprintf(stderr, "Error in filter option parsing: '%s'\n", ptr);
return 1;
}
}
if (err_mask)
setsockopt(obj->s, SOL_CAN_RAW, CAN_RAW_ERR_FILTER,
&err_mask, sizeof(err_mask));
if (join_filter && setsockopt(obj->s, SOL_CAN_RAW, CAN_RAW_JOIN_FILTERS,
&join_filter, sizeof(join_filter)) < 0) {
perror("setsockopt CAN_RAW_JOIN_FILTERS not supported by your Linux Kernel");
return 1;
}
if (numfilter)
setsockopt(obj->s, SOL_CAN_RAW, CAN_RAW_FILTER,
rfilter, numfilter * sizeof(struct can_filter));
free(rfilter);
} /* if (nptr) */
/* try to switch the socket into CAN FD mode */
setsockopt(obj->s, SOL_CAN_RAW, CAN_RAW_FD_FRAMES, &canfd_on, sizeof(canfd_on));
if (rcvbuf_size) {
int curr_rcvbuf_size;
socklen_t curr_rcvbuf_size_len = sizeof(curr_rcvbuf_size);
/* try SO_RCVBUFFORCE first, if we run with CAP_NET_ADMIN */
if (setsockopt(obj->s, SOL_SOCKET, SO_RCVBUFFORCE,
&rcvbuf_size, sizeof(rcvbuf_size)) < 0) {
pr_debug("SO_RCVBUFFORCE failed so try SO_RCVBUF ...\n");
if (setsockopt(obj->s, SOL_SOCKET, SO_RCVBUF,
&rcvbuf_size, sizeof(rcvbuf_size)) < 0) {
perror("setsockopt SO_RCVBUF");
return 1;
}
if (getsockopt(obj->s, SOL_SOCKET, SO_RCVBUF,
&curr_rcvbuf_size, &curr_rcvbuf_size_len) < 0) {
perror("getsockopt SO_RCVBUF");
return 1;
}
/* Only print a warning the first time we detect the adjustment */
/* n.b.: The wanted size is doubled in Linux in net/sore/sock.c */
if (!i && curr_rcvbuf_size < rcvbuf_size * 2)
fprintf(stderr, "The socket receive buffer size was "
"adjusted due to /proc/sys/net/core/rmem_max.\n");
}
}
if (timestamp || log || logfrmt) {
if (hwtimestamp) {
const int timestamping_flags = (SOF_TIMESTAMPING_SOFTWARE |
SOF_TIMESTAMPING_RX_SOFTWARE |
SOF_TIMESTAMPING_RAW_HARDWARE);
if (setsockopt(obj->s, SOL_SOCKET, SO_TIMESTAMPING,
×tamping_flags, sizeof(timestamping_flags)) < 0) {
perror("setsockopt SO_TIMESTAMPING is not supported by your Linux kernel");
return 1;
}
} else {
const int timestamp_on = 1;
if (setsockopt(obj->s, SOL_SOCKET, SO_TIMESTAMP,
×tamp_on, sizeof(timestamp_on)) < 0) {
perror("setsockopt SO_TIMESTAMP");
return 1;
}
}
}
if (dropmonitor) {
const int dropmonitor_on = 1;
if (setsockopt(obj->s, SOL_SOCKET, SO_RXQ_OVFL,
&dropmonitor_on, sizeof(dropmonitor_on)) < 0) {
perror("setsockopt SO_RXQ_OVFL not supported by your Linux Kernel");
return 1;
}
}
if (bind(obj->s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
perror("bind");
return 1;
}
}
if (log) {
if (!logname) {
time_t currtime;
struct tm now;
if (time(&currtime) == (time_t)-1) {
perror("time");
return 1;
}
localtime_r(&currtime, &now);
snprintf(fname, sizeof(fname), "candump-%04d-%02d-%02d_%02d%02d%02d.log",
now.tm_year + 1900,
now.tm_mon + 1,
now.tm_mday,
now.tm_hour,
now.tm_min,
now.tm_sec);
logname = fname;
}
if (silent != SILENT_ON)
fprintf(stderr, "Warning: Console output active while logging!\n");
fprintf(stderr, "Enabling Logfile '%s'\n", logname);
logfile = fopen(logname, "w");
if (!logfile) {
perror("logfile");
return 1;
}
}
/* these settings are static and can be held out of the hot path */
iov.iov_base = &frame;
msg.msg_name = &addr;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = &ctrlmsg;
while (running) {
num_events = epoll_wait(fd_epoll, events_pending, currmax, timeout_ms);
if (num_events == -1) {
if (errno != EINTR)
running = 0;
continue;
}
/* handle timeout */
if (!num_events && timeout_ms >= 0) {
running = 0;
continue;
}
for (i = 0; i < num_events; i++) { /* check waiting CAN RAW sockets */
struct if_info *obj = events_pending[i].data.ptr;
int idx;
char *extra_info = "";
/* these settings may be modified by recvmsg() */
iov.iov_len = sizeof(frame);
msg.msg_namelen = sizeof(addr);
msg.msg_controllen = sizeof(ctrlmsg);
msg.msg_flags = 0;
nbytes = recvmsg(obj->s, &msg, 0);
idx = idx2dindex(addr.can_ifindex, obj->s);
if (nbytes < 0) {
if ((errno == ENETDOWN) && !down_causes_exit) {
fprintf(stderr, "%s: interface down\n", devname[idx]);
continue;
}
perror("read");
return 1;
}
if ((size_t)nbytes == CAN_MTU)
maxdlen = CAN_MAX_DLEN;
else if ((size_t)nbytes == CANFD_MTU)
maxdlen = CANFD_MAX_DLEN;
else {
fprintf(stderr, "read: incomplete CAN frame\n");
return 1;
}
if (count && (--count == 0))
running = 0;
for (cmsg = CMSG_FIRSTHDR(&msg);
cmsg && (cmsg->cmsg_level == SOL_SOCKET);
cmsg = CMSG_NXTHDR(&msg,cmsg)) {
if (cmsg->cmsg_type == SO_TIMESTAMP) {
memcpy(&tv, CMSG_DATA(cmsg), sizeof(tv));
} else if (cmsg->cmsg_type == SO_TIMESTAMPING) {
struct timespec *stamp = (struct timespec *)CMSG_DATA(cmsg);
/*
* stamp[0] is the software timestamp
* stamp[1] is deprecated
* stamp[2] is the raw hardware timestamp
* See chapter 2.1.2 Receive timestamps in
* linux/Documentation/networking/timestamping.txt
*/
tv.tv_sec = stamp[2].tv_sec;
tv.tv_usec = stamp[2].tv_nsec / 1000;
} else if (cmsg->cmsg_type == SO_RXQ_OVFL) {
memcpy(&obj->dropcnt, CMSG_DATA(cmsg), sizeof(__u32));
}
}
/* check for (unlikely) dropped frames on this specific socket */
if (obj->dropcnt != obj->last_dropcnt) {
__u32 frames = obj->dropcnt - obj->last_dropcnt;
if (silent != SILENT_ON)
printf("DROPCOUNT: dropped %u CAN frame%s on '%s' socket (total drops %u)\n",
frames, (frames > 1)?"s":"", devname[idx], obj->dropcnt);
if (log)
fprintf(logfile, "DROPCOUNT: dropped %u CAN frame%s on '%s' socket (total drops %u)\n",
frames, (frames > 1)?"s":"", devname[idx], obj->dropcnt);
obj->last_dropcnt = obj->dropcnt;
}
/* once we detected a EFF frame indent SFF frames accordingly */
if (frame.can_id & CAN_EFF_FLAG)
view |= CANLIB_VIEW_INDENT_SFF;
if (extra_msg_info) {
if (msg.msg_flags & MSG_DONTROUTE)
extra_info = " T";
else
extra_info = " R";
}
if (log) {
char buf[CL_CFSZ]; /* max length */
char ts_buf[TIMESTAMPSZ];
sprint_timestamp(logtimestamp, &tv, &last_tv, ts_buf);
/* log CAN frame with absolute timestamp & device */
sprint_canframe(buf, &frame, 0, maxdlen);
fprintf(logfile, "%s%*s %s%s\n", ts_buf,
max_devname_len, devname[idx], buf,
extra_info);
}
if ((logfrmt) && (silent == SILENT_OFF)) {
char buf[CL_CFSZ]; /* max length */
/* print CAN frame in log file style to stdout */
sprint_canframe(buf, &frame, 0, maxdlen);
print_timestamp(logtimestamp, &tv, &last_tv);
printf("%*s %s%s\n",
max_devname_len, devname[idx], buf,
extra_info);
goto out_fflush; /* no other output to stdout */
}
if (silent != SILENT_OFF) {
if (silent == SILENT_ANI) {
printf("%c\b", anichar[silentani %= MAXANI]);
silentani++;
}
goto out_fflush; /* no other output to stdout */
}
printf(" %s", (color > 2) ? col_on[idx % MAXCOL] : "");
print_timestamp(timestamp, &tv, &last_tv);
printf(" %s", (color && (color < 3)) ? col_on[idx % MAXCOL] : "");
printf("%*s", max_devname_len, devname[idx]);
if (extra_msg_info) {
if (msg.msg_flags & MSG_DONTROUTE)
printf(" TX %s", extra_m_info[frame.flags & 3]);
else
printf(" RX %s", extra_m_info[frame.flags & 3]);
}
printf("%s ", (color == 1) ? col_off : "");
fprint_long_canframe(stdout, &frame, NULL, view, maxdlen);
printf("%s", (color > 1) ? col_off : "");
printf("\n");
out_fflush:
fflush(stdout);
}
}
for (i = 0; i < currmax; i++)
close(sock_info[i].s);
close(fd_epoll);
if (log)
fclose(logfile);
if (signal_num)
return 128 + signal_num;
return 0;
}
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