usbmon

commit 1b5db92dbd54dc1e4ccdfde3848e31457196a6c8
parent 57a1b3850e65f37c2282177f6201439eefcb49a2
Author: Brian Swetland <swetland@frotz.net>
Date:   Sun, 20 Apr 2014 12:03:08 -0700

add README and -b and -b options

Diffstat:
A
README
 | 
20
++++++++++++++++++++
M
usbmon.c
 | 
24
+++++++++++++++++++++---

2 files changed, 41 insertions(+), 3 deletions(-)
diff --git a/README b/README
@@ -0,0 +1,20 @@
+
+USBMON
+------
+
+A simple tool to trace linux USB activity, using /dev/usbmon0.
+
+By default it dumps all USB traffic.  Use options:
+
+ -b###  dump only bus ###
+ -d###  dump only device ###
+ -x###  exclude device ### from dump
+
+If you don't have /dev/usbmon0 you probably need to load the driver:
+% sudo modprobe usbmon
+
+And you will likely have to adjust permissions too (unless you want to
+run this program as root):
+% sudo chown $USER /dev/usbmon0
+
+
diff --git a/usbmon.c b/usbmon.c
@@ -41,6 +41,7 @@ int main(int argc, char **argv)
 	struct usbmon_get arg;
 	unsigned char filter_dev[128];
 	int fd, r, n;
+	unsigned busmask = 0;
 
 	memset(filter_dev, 0, sizeof(filter_dev));
 
@@ -53,12 +54,23 @@ int main(int argc, char **argv)
 	while (argc--) {
 		if (argv[0][0] == '-') {
 			switch(argv[0][1]) {
-			case 'x':
+			case 'x': /* eXclude device */
 				r = atoi(argv[0] + 2);
 				if ((r < 0) || (r > 127))
 					continue;
 				filter_dev[r] = 1;
 				break;
+			case 'b': /* limit to Bus */
+				r = atoi(argv[0] + 2);
+				busmask = ~(1 << r);
+				break;
+			case 'd': /* limit to Device */
+				memset(filter_dev, 0x01, sizeof(filter_dev));
+				r = atoi(argv[0] + 2);
+				if ((r < 0) || (r > 127))
+					continue;
+				filter_dev[r] = 0;
+				break;
 			}
 		}
 		argv++;
@@ -73,6 +85,8 @@ int main(int argc, char **argv)
 			break;
 		if (filter_dev[hdr.devnum])
 			continue;
+		if (busmask & (1 << hdr.busnum))
+			continue;
 		printf("%d.%03d.%03d %c %c%c %04x",
 			hdr.busnum, hdr.devnum, hdr.epnum & 0x7F,
 			hdr.type,
@@ -107,8 +121,11 @@ int main(int argc, char **argv)
 			case -ETIMEDOUT:
 				printf(" TIMEDOUT\n");
 				break;
+			case -EREMOTEIO:
+				printf(" OK (SHORT)\n");
+				break;
 			default:
-				printf(" %s\n", strerror(-hdr.status));
+				printf(" %s (%d)\n", strerror(-hdr.status),-hdr.status);
 			}
 		}
 		if (!hdr.len_cap) 
@@ -118,8 +135,9 @@ dumpdata:
 		if (hdr.len_cap > sizeof(data))
 			hdr.len_cap = sizeof(data);
 		for (n = 0; n < hdr.len_cap; n++) 
-			printf((n & 3) ? "%02x" : " %02x",data[n]);
+			printf((n & 3) ? " %02x" : " %02x",data[n]);
 		printf("\n");
+		fflush(stdout);
 	}
 	return 0;	
 }