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isotpsniffer: option for no quitting on invalid message received

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Mateusz Juzwiak
2024-07-19 05:37:53 -04:00
parent 95fe6522c6
commit 1e2c8fea4c
1 changed files with 19 additions and 7 deletions
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isotpsniffer.c
+19 -7
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@@ -79,6 +79,7 @@ void print_usage(char *prg)
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 (set link layer options for CAN FD)\n"); fprintf(stderr, " -L (set 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, " -q (don't quit on read error, allows to receive malformed frames)\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");
} }
@@ -189,6 +190,7 @@ int main(int argc, char **argv)
int head = 0; int head = 0;
int timestamp = 0; int timestamp = 0;
int format = FORMAT_DEFAULT; int format = FORMAT_DEFAULT;
int noquit = 0;
canid_t src = NO_CAN_ID; canid_t src = NO_CAN_ID;
canid_t dst = NO_CAN_ID; canid_t dst = NO_CAN_ID;
extern int optind, opterr, optopt; extern int optind, opterr, optopt;
@@ -197,7 +199,7 @@ 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:L?")) != -1) { while ((opt = getopt(argc, argv, "s:d:x:X:h:ct:f:L?q")) != -1) {
switch (opt) { switch (opt) {
case 's': case 's':
src = strtoul(optarg, NULL, 16); src = strtoul(optarg, NULL, 16);
@@ -249,6 +251,10 @@ int main(int argc, char **argv)
} }
break; break;
case 'q':
noquit = 1;
break;
case '?': case '?':
print_usage(basename(argv[0])); print_usage(basename(argv[0]));
goto out; goto out;
@@ -371,14 +377,17 @@ int main(int argc, char **argv)
if (nbytes < 0) { if (nbytes < 0) {
perror("read socket s"); perror("read socket s");
r = 1; r = 1;
goto out; if(!noquit)
goto out;
} }
if (nbytes > 4095) { if (nbytes > 4095) {
r = 1; r = 1;
perror("read socket s too much data");
goto out; goto out;
} }
printbuf(buffer, nbytes, color?2:0, timestamp, format, if(nbytes > 0)
&tv, &last_tv, dst, s, if_name, head); printbuf(buffer, nbytes, color?2:0, timestamp, format,
&tv, &last_tv, dst, s, if_name, head);
} }
if (FD_ISSET(t, &rdfs)) { if (FD_ISSET(t, &rdfs)) {
@@ -386,14 +395,17 @@ int main(int argc, char **argv)
if (nbytes < 0) { if (nbytes < 0) {
perror("read socket t"); perror("read socket t");
r = 1; r = 1;
goto out; if(!noquit)
goto out;
} }
if (nbytes > 4095) { if (nbytes > 4095) {
r = 1; r = 1;
perror("read socket t too much data");
goto out; goto out;
} }
printbuf(buffer, nbytes, color?1:0, timestamp, format, if(nbytes > 0)
&tv, &last_tv, src, t, if_name, head); printbuf(buffer, nbytes, color?1:0, timestamp, format,
&tv, &last_tv, src, t, if_name, head);
} }
} }