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Merge pull request #169 from rumpelsepp/isotpsniffer 

isotpsniffer: add llopts support, use isprint() instead of open coded check and clean up error paths.
pull/172/head
Oliver Hartkopp 2019-11-14 13:54:05 +01:00 committed by GitHub
parent bf30a4bc01 da33f96edf
commit 9ae877ce32
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 66 additions and 24 deletions
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88
isotpsniffer.c
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@ -44,6 +44,7 @@
#include <stdio.h> #include <stdio.h>
#include <unistd.h> #include <unistd.h>
#include <ctype.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <libgen.h> #include <libgen.h>
@ -75,6 +76,7 @@ void print_usage(char *prg)
fprintf(stderr, " -c (color mode)\n"); fprintf(stderr, " -c (color mode)\n");
fprintf(stderr, " -t <type> (timestamp: (a)bsolute/(d)elta/(z)ero/(A)bsolute w date)\n"); fprintf(stderr, " -t <type> (timestamp: (a)bsolute/(d)elta/(z)ero/(A)bsolute w date)\n");
fprintf(stderr, " -f <format> (1 = HEX, 2 = ASCII, 3 = HEX & ASCII - default: %d)\n", FORMAT_DEFAULT); fprintf(stderr, " -f <format> (1 = HEX, 2 = ASCII, 3 = HEX & ASCII - default: %d)\n", FORMAT_DEFAULT);
fprintf(stderr, " -L <mtu>:<tx_dl>:<tx_flags> (link layer options for CAN FD)\n");
fprintf(stderr, " -h <len> (head: print only first <len> bytes)\n"); fprintf(stderr, " -h <len> (head: print only first <len> bytes)\n");
fprintf(stderr, "\nCAN IDs and addresses are given and expected in hexadecimal values.\n"); fprintf(stderr, "\nCAN IDs and addresses are given and expected in hexadecimal values.\n");
fprintf(stderr, "\n"); fprintf(stderr, "\n");
@ -153,7 +155,7 @@ void printbuf(unsigned char *buffer, int nbytes, int color, int timestamp,
if (format & FORMAT_ASCII) { if (format & FORMAT_ASCII) {
printf("'"); printf("'");
for (i=0; i<nbytes; i++) { for (i=0; i<nbytes; i++) {
if ((buffer[i] > 0x1F) && (buffer[i] < 0x7F)) if (isprint(buffer[i]))
printf("%c", buffer[i]); printf("%c", buffer[i]);
else else
printf("."); printf(".");
@ -175,10 +177,12 @@ void printbuf(unsigned char *buffer, int nbytes, int color, int timestamp,
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
fd_set rdfs; fd_set rdfs;
int s, t; int s = 0, t = 0;
struct sockaddr_can addr; struct sockaddr_can addr;
char if_name[IFNAMSIZ]; char if_name[IFNAMSIZ];
static struct can_isotp_options opts; static struct can_isotp_options opts;
static struct can_isotp_ll_options llopts;
int r = 0;
int opt, quit = 0; int opt, quit = 0;
int color = 0; int color = 0;
int head = 0; int head = 0;
@ -192,7 +196,7 @@ int main(int argc, char **argv)
unsigned char buffer[4096]; unsigned char buffer[4096];
int nbytes; int nbytes;
while ((opt = getopt(argc, argv, "s:d:x:X:h:ct:f:?")) != -1) { while ((opt = getopt(argc, argv, "s:d:x:X:h:ct:f:L:?")) != -1) {
switch (opt) { switch (opt) {
case 's': case 's':
src = strtoul(optarg, (char **)NULL, 16); src = strtoul(optarg, (char **)NULL, 16);
@ -220,6 +224,17 @@ int main(int argc, char **argv)
format = (atoi(optarg) & (FORMAT_ASCII | FORMAT_HEX)); format = (atoi(optarg) & (FORMAT_ASCII | FORMAT_HEX));
break; 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(1);
}
break;
case 'h': case 'h':
head = atoi(optarg); head = atoi(optarg);
break; break;
@ -240,35 +255,37 @@ int main(int argc, char **argv)
case '?': case '?':
print_usage(basename(argv[0])); print_usage(basename(argv[0]));
exit(0); goto out;
break;
default: default:
fprintf(stderr, "Unknown option %c\n", opt); fprintf(stderr, "Unknown option %c\n", opt);
print_usage(basename(argv[0])); print_usage(basename(argv[0]));
exit(1); goto out;
break;
} }
} }
if ((argc - optind) != 1 || src == NO_CAN_ID || dst == NO_CAN_ID) { if ((argc - optind) != 1 || src == NO_CAN_ID || dst == NO_CAN_ID) {
print_usage(basename(argv[0])); print_usage(basename(argv[0]));
exit(1); r = 1;
goto out;
} }
if ((opts.flags & CAN_ISOTP_RX_EXT_ADDR) && (!(opts.flags & CAN_ISOTP_EXTEND_ADDR))) { if ((opts.flags & CAN_ISOTP_RX_EXT_ADDR) && (!(opts.flags & CAN_ISOTP_EXTEND_ADDR))) {
print_usage(basename(argv[0])); print_usage(basename(argv[0]));
exit(1); r = 1;
goto out;
} }
if ((s = socket(PF_CAN, SOCK_DGRAM, CAN_ISOTP)) < 0) { if ((s = socket(PF_CAN, SOCK_DGRAM, CAN_ISOTP)) < 0) {
perror("socket"); perror("socket");
exit(1); r = 1;
goto out;
} }
if ((t = socket(PF_CAN, SOCK_DGRAM, CAN_ISOTP)) < 0) { if ((t = socket(PF_CAN, SOCK_DGRAM, CAN_ISOTP)) < 0) {
perror("socket"); perror("socket");
exit(1); r = 1;
goto out;
} }
opts.flags |= CAN_ISOTP_LISTEN_MODE; opts.flags |= CAN_ISOTP_LISTEN_MODE;
@ -286,8 +303,8 @@ int main(int argc, char **argv)
if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) { if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
perror("bind"); perror("bind");
close(s); r = 1;
exit(1); goto out;
} }
if (opts.flags & CAN_ISOTP_RX_EXT_ADDR) { if (opts.flags & CAN_ISOTP_RX_EXT_ADDR) {
@ -299,15 +316,30 @@ int main(int argc, char **argv)
opts.rx_ext_address = tmpext; opts.rx_ext_address = tmpext;
} }
setsockopt(t, SOL_CAN_ISOTP, CAN_ISOTP_OPTS, &opts, sizeof(opts)); if ((setsockopt(t, SOL_CAN_ISOTP, CAN_ISOTP_OPTS, &opts, sizeof(opts))) < 0) {
perror("setsockopt");
r = 1;
goto out;
}
if ((setsockopt(s, SOL_CAN_ISOTP, CAN_ISOTP_LL_OPTS, &llopts, sizeof(llopts))) < 0) {
perror("setsockopt");
r = 1;
goto out;
}
if ((setsockopt(t, SOL_CAN_ISOTP, CAN_ISOTP_LL_OPTS, &llopts, sizeof(llopts))) < 0) {
perror("setsockopt");
r = 1;
goto out;
}
addr.can_addr.tp.tx_id = dst; addr.can_addr.tp.tx_id = dst;
addr.can_addr.tp.rx_id = src; addr.can_addr.tp.rx_id = src;
if (bind(t, (struct sockaddr *)&addr, sizeof(addr)) < 0) { if (bind(t, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
perror("bind"); perror("bind");
close(s); r = 1;
exit(1); goto out;
} }
while (!quit) { while (!quit) {
@ -332,10 +364,13 @@ int main(int argc, char **argv)
nbytes = read(s, buffer, 4096); nbytes = read(s, buffer, 4096);
if (nbytes < 0) { if (nbytes < 0) {
perror("read socket s"); perror("read socket s");
return -1; r = 1;
goto out;
}
if (nbytes > 4095) {
r = 1;
goto out;
} }
if (nbytes > 4095)
return -1;
printbuf(buffer, nbytes, color?2:0, timestamp, format, printbuf(buffer, nbytes, color?2:0, timestamp, format,
&tv, &last_tv, dst, s, if_name, head); &tv, &last_tv, dst, s, if_name, head);
} }
@ -344,16 +379,23 @@ int main(int argc, char **argv)
nbytes = read(t, buffer, 4096); nbytes = read(t, buffer, 4096);
if (nbytes < 0) { if (nbytes < 0) {
perror("read socket t"); perror("read socket t");
return -1; r = 1;
goto out;
}
if (nbytes > 4095) {
r = 1;
goto out;
} }
if (nbytes > 4095)
return -1;
printbuf(buffer, nbytes, color?1:0, timestamp, format, printbuf(buffer, nbytes, color?1:0, timestamp, format,
&tv, &last_tv, src, t, if_name, head); &tv, &last_tv, src, t, if_name, head);
} }
} }
out:
if (s)
close(s); close(s);
if (t)
close(t);
return 0; return r;
} }