From 764b9679bb9188a973047982c82f06813d161325 Mon Sep 17 00:00:00 2001
From: Fritz Elfert <felfert@to.com>
Date: Wed, 31 Jan 2001 02:01:16 +0000
Subject: Added tty sniffer.

---
 etc/ttytap.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 etc/ttytap.c

diff --git a/etc/ttytap.c b/etc/ttytap.c
new file mode 100644
index 0000000..6914e6a
--- /dev/null
+++ b/etc/ttytap.c
@@ -0,0 +1,88 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/fcntl.h>
+#include <sys/time.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <linux/ttytap.h>
+#include <linux/kdev_t.h>
+
+static void usage(void) {
+	fprintf(stderr, "usage: ttytap -q|<ttyDevice>\n");
+	exit(1);
+}
+
+int main(int argc, char **argv) {
+	int fd;
+	tapheader th;
+	int i;
+	int r;
+	int major;
+	int minor;
+	int lastdir = -1;
+	struct stat stbuf;
+	char tbuf[256];
+	unsigned char buf[4096];
+
+
+	if (argc != 2)
+		usage();
+	if (strcmp(argv[1], "-q")) {
+		if (stat(argv[1], &stbuf)) {
+			perror(argv[1]);
+			exit(-1);
+		}
+		if (!S_ISCHR(stbuf.st_mode)) {
+			fprintf(stderr, "%s is not a char device\n", argv[1]);
+			exit(1);
+		}
+		major = MAJOR(stbuf.st_rdev);
+		minor = MINOR(stbuf.st_rdev);
+	} else {
+		minor = 0;
+		major = 0;
+	}
+	fd = open("/proc/ttytap", O_RDONLY);
+	if (fd == -1) {
+		perror("/proc/ttytap");
+		exit(-1);
+	}
+	if (ioctl(fd, TTYTAP_SETDEV, (major << 8) | minor)) {
+		perror("ioctl /proc/ttytap");
+		exit(-1);
+	}
+	if ((minor == 0) && (major == 0)) {
+		printf("Serial tapping switched off\n");
+		exit(0);
+	}
+	if (ioctl(fd, TTYTAP_GETQLEN, &i)) {
+		perror("ioctl /proc/ttytap");
+		exit(-1);
+	}
+	fprintf(stderr, "Queue length is %d\n", i);
+	while (1) {
+		r = read(fd, &th, sizeof(th));
+		if (r != sizeof(th)) {
+			perror("read /proc/ttytap");
+			exit(-1);
+		}
+		strftime(tbuf, 255, "%H:%M:%S", localtime(&th.stamp.tv_sec));
+		printf("%s.%06ld %c (%04d) ", tbuf,
+			(unsigned long)th.stamp.tv_usec,
+			(th.io) ? '<' : '>', th.len);
+		r = read(fd, buf, th.len);
+		if (r != th.len) {
+			perror("read /proc/ttytap");
+			exit(-1);
+		}
+		for (i = 0; i < th.len; i++)
+			printf("%02x ", buf[i] & 255);
+		for (i = 0; i < th.len; i++)
+			printf("%c", isprint(buf[i]) ? buf[i] : '.');
+		printf("\n"); fflush(stdout);
+	}
+	return 0;
+}
-- 
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