1 files changed, 116 insertions, 0 deletions
diff --git a/canecho.c b/canecho.c
new file mode 100644
index 0000000..72f84b8
--- /dev/null
+++ b/canecho.c
@@ -0,0 +1,116 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <signal.h>
+#include <libgen.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+
+#include "can.h"
+
+extern int optind, opterr, optopt;
+
+static int	s = -1;
+static int	running = 1;
+
+void print_usage(char *prg)
+{
+	fprintf(stderr, "Usage: %s [can-interface]\n", prg);
+}
+
+void sigterm(int signo)
+{
+	printf("got signal %d\n", signo);
+	running = 0;
+}
+
+int main(int argc, char **argv)
+{
+	int family = PF_CAN, type = SOCK_RAW, proto = CAN_PROTO_RAW;
+	int opt;
+	struct sockaddr_can addr;
+	struct can_frame frame;
+	int nbytes, i;
+	int verbose = 0;
+	struct ifreq ifr;
+
+	signal(SIGTERM, sigterm);
+	signal(SIGHUP, sigterm);
+
+	while ((opt = getopt(argc, argv, "f:t:p:v")) != -1) {
+		switch (opt) {
+			case 'f':
+				family = atoi(optarg);
+				break;
+
+			case 't':
+				type = atoi(optarg);
+				break;
+
+			case 'p':
+				proto = atoi(optarg);
+				break;
+
+			case 'v':
+				verbose = 1;
+				break;
+
+			case '?':
+				break;
+
+			default:
+				fprintf(stderr, "Unknown option %c\n", opt);
+				break;
+		}
+	}
+
+	if (optind == argc) {
+		print_usage(basename(argv[0]));
+		exit(0);
+	}
+	
+	printf("interface = %s, family = %d, type = %d, proto = %d\n",
+			argv[optind], family, type, proto);
+	if ((s = socket(family, type, proto)) < 0) {
+		perror("socket");
+		return 1;
+	}
+
+	addr.can_family = family;
+	strcpy(ifr.ifr_name, argv[optind]);
+	ioctl(s, SIOCGIFINDEX, &ifr);
+	addr.can_ifindex = ifr.ifr_ifindex;
+
+	if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+		perror("bind");
+		return 1;
+	}
+
+	while (running) {
+		if ((nbytes = read(s, &frame, sizeof(frame))) < 0) {
+			perror("read");
+			return 1;
+		}
+		if (verbose) {
+			printf("%04x: ", frame.can_id);
+			if (frame.can_id & CAN_FLAG_RTR) {
+				printf("remote request");
+			} else {
+				printf("[%d]", frame.can_dlc);
+				for (i = 0; i < frame.can_dlc; i++) {
+					printf(" %02x", frame.payload.byte[i]);
+				}
+			}
+			printf("\n");
+		}
+		frame.can_id++;
+		write(s, &frame, sizeof(frame));
+	}
+
+	return 0;
+}