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bcmserver: allow CAN netdevice names greater than 6 characters

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The sscanf() function to parse bcmserver command strings limited the length of
the CAN netdevice name to six characters. With this patch the length is derived
from the IFNAMSIZ which defines the space in ifr.ifr_name.

Signed-off-by: Jiho Chu <jiho.chu@samsung.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
This commit is contained in:
Jiho Chu
2017-01-14 20:15:40 +01:00
committed by Oliver Hartkopp
parent c3305fdd51
commit 99f1664e0c
1 changed files with 8 additions and 3 deletions
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bcmserver.c
+8 -3
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@@ -126,6 +126,7 @@
#include <linux/can/bcm.h> #include <linux/can/bcm.h>
#define MAXLEN 100 #define MAXLEN 100
#define FORMATSZ 80
#define PORT 28600 #define PORT 28600
void childdied(int i) void childdied(int i)
@@ -149,6 +150,7 @@ int main(int argc, char **argv)
sigset_t sigset; sigset_t sigset;
char buf[MAXLEN]; char buf[MAXLEN];
char format[FORMATSZ];
char rxmsg[50]; char rxmsg[50];
struct { struct {
@@ -156,6 +158,11 @@ int main(int argc, char **argv)
struct can_frame frame; struct can_frame frame;
} msg; } msg;
if (snprintf(format, FORMATSZ, "< %%%ds %%c %%lu %%lu %%x %%hhu "
"%%hhx %%hhx %%hhx %%hhx %%hhx %%hhx "
"%%hhx %%hhx >", IFNAMSIZ-1) >= FORMATSZ-1)
exit(1);
sigemptyset(&sigset); sigemptyset(&sigset);
signalaction.sa_handler = &childdied; signalaction.sa_handler = &childdied;
signalaction.sa_mask = sigset; signalaction.sa_mask = sigset;
@@ -282,9 +289,7 @@ int main(int argc, char **argv)
memset(&msg, 0, sizeof(msg)); memset(&msg, 0, sizeof(msg));
msg.msg_head.nframes = 1; msg.msg_head.nframes = 1;
items = sscanf(buf, "< %6s %c %lu %lu %x %hhu " items = sscanf(buf, format,
"%hhx %hhx %hhx %hhx %hhx %hhx "
"%hhx %hhx >",
ifr.ifr_name, ifr.ifr_name,
&cmd, &cmd,
&msg.msg_head.ival2.tv_sec, &msg.msg_head.ival2.tv_sec,