#define NO_CAN_ID 0xFFFFFFFFU
+/* allow PDUs greater 4095 bytes according ISO 15765-2:2015 */
+#define MAX_PDU_LENGTH 6000
+
int b64hex(char *asc, unsigned char *bin, int len)
{
int i;
fprintf(stderr, "isotp adressing:\n");
fprintf(stderr, " * -s <can_id> (source can_id. Use 8 digits for extended IDs)\n");
fprintf(stderr, " * -d <can_id> (destination can_id. Use 8 digits for extended IDs)\n");
- fprintf(stderr, " -x <addr> (extended addressing mode)\n");
+ fprintf(stderr, " -x <addr>[:<rxaddr>] (extended addressing / opt. separate rxaddr)\n");
+ fprintf(stderr, " -L <mtu>:<tx_dl>:<tx_flags> (link layer options for CAN FD)\n");
fprintf(stderr, "\n");
fprintf(stderr, "padding:\n");
- fprintf(stderr, " -p <byte> (set and enable tx padding byte)\n");
- fprintf(stderr, " -r <byte> (set and enable rx padding byte)\n");
- fprintf(stderr, " -P <mode> (check padding in SF/CF. (l)ength (c)ontent (a)ll)\n");
+ fprintf(stderr, " -p [tx]:[rx] (set and enable tx/rx padding bytes)\n");
+ fprintf(stderr, " -P <mode> (check rx padding for (l)ength (c)ontent (a)ll)\n");
fprintf(stderr, "\n");
fprintf(stderr, "rx path: (config, which is sent to the sender / data source)\n");
fprintf(stderr, " -b <bs> (blocksize. 0 = off)\n");
struct sockaddr_can caddr;
static struct can_isotp_options opts;
static struct can_isotp_fc_options fcopts;
+ static struct can_isotp_ll_options llopts;
struct ifreq ifr;
socklen_t sin_size = sizeof(clientaddr);
socklen_t caddrlen = sizeof(caddr);
int idx = 0; /* index in txmsg[] */
- unsigned char msg[4096]; /* isotp socket message buffer (4095 + test_for_too_long_byte)*/
- char rxmsg[8194]; /* isotp->tcp ASCII message buffer (4095*2 + < > \n null) */
- char txmsg[8193]; /* tcp->isotp ASCII message buffer (4095*2 + < > null) */
+ unsigned char msg[MAX_PDU_LENGTH + 1]; /* isotp socket message buffer (4095 + test_for_too_long_byte)*/
+ char rxmsg[MAX_PDU_LENGTH * 2 + 4]; /* isotp->tcp ASCII message buffer (4095*2 + < > \n null) */
+ char txmsg[MAX_PDU_LENGTH * 2 + 3]; /* tcp->isotp ASCII message buffer (4095*2 + < > null) */
/* mark missing mandatory commandline options as missing */
caddr.can_addr.tp.tx_id = caddr.can_addr.tp.rx_id = NO_CAN_ID;
- while ((opt = getopt(argc, argv, "l:s:d:x:p:r:P:b:m:w:t:v?")) != -1) {
+ while ((opt = getopt(argc, argv, "l:s:d:x:p:P:b:m:w:t:L:v?")) != -1) {
switch (opt) {
case 'l':
local_port = strtoul(optarg, (char **)NULL, 10);
break;
case 'x':
- opts.flags |= CAN_ISOTP_EXTEND_ADDR;
- opts.ext_address = strtoul(optarg, (char **)NULL, 16) & 0xFF;
+ {
+ int elements = sscanf(optarg, "%hhx:%hhx",
+ &opts.ext_address,
+ &opts.rx_ext_address);
+
+ if (elements == 1)
+ opts.flags |= CAN_ISOTP_EXTEND_ADDR;
+ else if (elements == 2)
+ opts.flags |= (CAN_ISOTP_EXTEND_ADDR | CAN_ISOTP_RX_EXT_ADDR);
+ else {
+ printf("incorrect extended addr values '%s'.\n", optarg);
+ print_usage(basename(argv[0]));
+ exit(0);
+ }
break;
+ }
case 'p':
- opts.flags |= CAN_ISOTP_TX_PADDING;
- opts.txpad_content = strtoul(optarg, (char **)NULL, 16) & 0xFF;
- break;
-
- case 'r':
- opts.flags |= CAN_ISOTP_RX_PADDING;
- opts.rxpad_content = strtoul(optarg, (char **)NULL, 16) & 0xFF;
+ {
+ int elements = sscanf(optarg, "%hhx:%hhx",
+ &opts.txpad_content,
+ &opts.rxpad_content);
+
+ if (elements == 1)
+ opts.flags |= CAN_ISOTP_TX_PADDING;
+ else if (elements == 2)
+ opts.flags |= (CAN_ISOTP_TX_PADDING | CAN_ISOTP_RX_PADDING);
+ else if (sscanf(optarg, ":%hhx", &opts.rxpad_content) == 1)
+ opts.flags |= CAN_ISOTP_RX_PADDING;
+ else {
+ printf("incorrect padding values '%s'.\n", optarg);
+ print_usage(basename(argv[0]));
+ exit(0);
+ }
break;
+ }
case 'P':
if (optarg[0] == 'l')
opts.frame_txtime = strtoul(optarg, (char **)NULL, 10);
break;
+ case 'L':
+ if (sscanf(optarg, "%hhu:%hhu:%hhu",
+ &llopts.mtu,
+ &llopts.tx_dl,
+ &llopts.tx_flags) != 3) {
+ printf("unknown link layer options '%s'.\n", optarg);
+ print_usage(basename(argv[0]));
+ exit(0);
+ }
+ break;
+
case 'v':
verbose = 1;
break;
setsockopt(sc, SOL_CAN_ISOTP, CAN_ISOTP_OPTS, &opts, sizeof(opts));
setsockopt(sc, SOL_CAN_ISOTP, CAN_ISOTP_RECV_FC, &fcopts, sizeof(fcopts));
+ if (llopts.tx_dl) {
+ if (setsockopt(sc, SOL_CAN_ISOTP, CAN_ISOTP_LL_OPTS, &llopts, sizeof(llopts)) < 0) {
+ perror("link layer sockopt");
+ exit(1);
+ }
+ }
+
caddr.can_family = AF_CAN;
strcpy(ifr.ifr_name, argv[optind]);
if (ioctl(sc, SIOCGIFINDEX, &ifr) < 0) {
if (FD_ISSET(sc, &readfds)) {
- nbytes = read(sc, &msg, 4096);
+ nbytes = read(sc, &msg, MAX_PDU_LENGTH + 1);
- if (nbytes < 1 || nbytes > 4095) {
+ if (nbytes < 1 || nbytes > MAX_PDU_LENGTH) {
perror("read from isotp socket");
exit(1);
}
}
/* max len is 4095*2 + '<' + '>' = 8192. The buffer index starts with 0 */
- if (idx > 8191) {
+ if (idx > MAX_PDU_LENGTH * 2 + 1) {
idx = 0;
continue;
}
#define NO_CAN_ID 0xFFFFFFFFU
#define DEFAULT_NAME "ctun%d"
+/* stay on 4095 bytes for the max. PDU length which is still much more than the standard ethernet MTU */
+#define MAX_PDU_LENGTH 4095
+#define BUF_LEN (MAX_PDU_LENGTH + 1)
+
static volatile int running = 1;
void print_usage(char *prg)
fprintf(stderr, "Options: -s <can_id> (source can_id. Use 8 digits for extended IDs)\n");
fprintf(stderr, " -d <can_id> (destination can_id. Use 8 digits for extended IDs)\n");
fprintf(stderr, " -n <name> (name of created IP netdevice. Default: '%s')\n", DEFAULT_NAME);
- fprintf(stderr, " -x <addr> (extended addressing mode.)\n");
- fprintf(stderr, " -p <byte> (padding byte rx path)\n");
- fprintf(stderr, " -q <byte> (padding byte tx path)\n");
- fprintf(stderr, " -P <mode> (check padding. (l)ength (c)ontent (a)ll)\n");
+ fprintf(stderr, " -x <addr>[:<rxaddr>] (extended addressing / opt. separate rxaddr)\n");
+ fprintf(stderr, " -L <mtu>:<tx_dl>:<tx_flags> (link layer options for CAN FD)\n");
+ fprintf(stderr, " -p [tx]:[rx] (set and enable tx/rx padding bytes)\n");
+ fprintf(stderr, " -P <mode> (check rx padding for (l)ength (c)ontent (a)ll)\n");
fprintf(stderr, " -t <time ns> (transmit time in nanosecs)\n");
fprintf(stderr, " -b <bs> (blocksize. 0 = off)\n");
fprintf(stderr, " -m <val> (STmin in ms/ns. See spec.)\n");
struct ifreq ifr;
static struct can_isotp_options opts;
static struct can_isotp_fc_options fcopts;
+ static struct can_isotp_ll_options llopts;
int opt, ret;
extern int optind, opterr, optopt;
static int verbose;
- unsigned char buffer[4096];
+ unsigned char buffer[BUF_LEN];
static char name[IFNAMSIZ] = DEFAULT_NAME;
int nbytes;
addr.can_addr.tp.tx_id = addr.can_addr.tp.rx_id = NO_CAN_ID;
- while ((opt = getopt(argc, argv, "s:d:n:x:p:q:P:t:b:m:whv?")) != -1) {
+ while ((opt = getopt(argc, argv, "s:d:n:x:p:P:t:b:m:whL:v?")) != -1) {
switch (opt) {
case 's':
addr.can_addr.tp.tx_id = strtoul(optarg, (char **)NULL, 16);
break;
case 'x':
- opts.flags |= CAN_ISOTP_EXTEND_ADDR;
- opts.ext_address = strtoul(optarg, (char **)NULL, 16) & 0xFF;
+ {
+ int elements = sscanf(optarg, "%hhx:%hhx",
+ &opts.ext_address,
+ &opts.rx_ext_address);
+
+ if (elements == 1)
+ opts.flags |= CAN_ISOTP_EXTEND_ADDR;
+ else if (elements == 2)
+ opts.flags |= (CAN_ISOTP_EXTEND_ADDR | CAN_ISOTP_RX_EXT_ADDR);
+ else {
+ printf("incorrect extended addr values '%s'.\n", optarg);
+ print_usage(basename(argv[0]));
+ exit(0);
+ }
break;
+ }
case 'p':
- opts.flags |= CAN_ISOTP_RX_PADDING;
- opts.rxpad_content = strtoul(optarg, (char **)NULL, 16) & 0xFF;
- break;
-
- case 'q':
- opts.flags |= CAN_ISOTP_TX_PADDING;
- opts.txpad_content = strtoul(optarg, (char **)NULL, 16) & 0xFF;
+ {
+ int elements = sscanf(optarg, "%hhx:%hhx",
+ &opts.txpad_content,
+ &opts.rxpad_content);
+
+ if (elements == 1)
+ opts.flags |= CAN_ISOTP_TX_PADDING;
+ else if (elements == 2)
+ opts.flags |= (CAN_ISOTP_TX_PADDING | CAN_ISOTP_RX_PADDING);
+ else if (sscanf(optarg, ":%hhx", &opts.rxpad_content) == 1)
+ opts.flags |= CAN_ISOTP_RX_PADDING;
+ else {
+ printf("incorrect padding values '%s'.\n", optarg);
+ print_usage(basename(argv[0]));
+ exit(0);
+ }
break;
+ }
case 'P':
if (optarg[0] == 'l')
opts.flags |= CAN_ISOTP_HALF_DUPLEX;
break;
+ case 'L':
+ if (sscanf(optarg, "%hhu:%hhu:%hhu",
+ &llopts.mtu,
+ &llopts.tx_dl,
+ &llopts.tx_flags) != 3) {
+ printf("unknown link layer options '%s'.\n", optarg);
+ print_usage(basename(argv[0]));
+ exit(0);
+ }
+ break;
+
case 'v':
verbose = 1;
break;
setsockopt(s, SOL_CAN_ISOTP, CAN_ISOTP_OPTS, &opts, sizeof(opts));
setsockopt(s, SOL_CAN_ISOTP, CAN_ISOTP_RECV_FC, &fcopts, sizeof(fcopts));
+ if (llopts.tx_dl) {
+ if (setsockopt(s, SOL_CAN_ISOTP, CAN_ISOTP_LL_OPTS, &llopts, sizeof(llopts)) < 0) {
+ perror("link layer sockopt");
+ exit(1);
+ }
+ }
+
addr.can_family = AF_CAN;
strcpy(ifr.ifr_name, argv[optind]);
ioctl(s, SIOCGIFINDEX, &ifr);
}
if (FD_ISSET(s, &rdfs)) {
- nbytes = read(s, buffer, 4096);
+ nbytes = read(s, buffer, BUF_LEN);
if (nbytes < 0) {
perror("read isotp socket");
return -1;
}
- if (nbytes > 4095)
+ if (nbytes > MAX_PDU_LENGTH)
return -1;
ret = write(t, buffer, nbytes);
if (verbose) {
}
if (FD_ISSET(t, &rdfs)) {
- nbytes = read(t, buffer, 4096);
+ nbytes = read(t, buffer, BUF_LEN);
if (nbytes < 0) {
perror("read tunfd");
return -1;
}
- if (nbytes > 4095)
+ if (nbytes > MAX_PDU_LENGTH)
return -1;
ret = write(s, buffer, nbytes);
if (verbose) {