Merge pull request #2113 from takumakume/opensnoop-display-uid
opensnoop: supported UID options
diff --git a/man/man8/opensnoop.8 b/man/man8/opensnoop.8
index 6989b52..9d99a90 100644
--- a/man/man8/opensnoop.8
+++ b/man/man8/opensnoop.8
@@ -27,6 +27,9 @@
\-T
Include a timestamp column.
.TP
+\-U
+Show UID.
+.TP
\-x
Only print failed opens.
.TP
@@ -36,6 +39,9 @@
\-t TID
Trace this thread ID only (filtered in-kernel).
.TP
+\-u UID
+Trace this UID only (filtered in-kernel).
+.TP
\-d DURATION
Total duration of trace in seconds.
.TP
@@ -61,6 +67,10 @@
#
.B opensnoop \-T
.TP
+Show UID:
+#
+.B opensnoop \-U
+.TP
Trace only open() syscalls that failed:
#
.B opensnoop \-x
@@ -69,6 +79,10 @@
#
.B opensnoop \-p 181
.TP
+Trace UID 1000 only:
+#
+.B opensnoop \-u 1000
+.TP
Trace all open() syscalls from processes where its name partially matches 'ed':
#
.B opensnoop \-n ed
@@ -85,6 +99,9 @@
TIME(s)
Time of the call, in seconds.
.TP
+UID
+User ID
+.TP
PID
Process ID
.TP
diff --git a/tools/opensnoop.py b/tools/opensnoop.py
index d8d06d1..3d6cc15 100755
--- a/tools/opensnoop.py
+++ b/tools/opensnoop.py
@@ -13,6 +13,7 @@
# 29-Apr-2016 Allan McAleavy Updated for BPF_PERF_OUTPUT.
# 08-Oct-2016 Dina Goldshtein Support filtering by PID and TID.
# 28-Dec-2018 Tim Douglas Print flags argument, enable filtering
+# 06-Jan-2019 Takuma Kume Support filtering by UID
from __future__ import print_function
from bcc import ArgString, BPF
@@ -26,9 +27,11 @@
examples = """examples:
./opensnoop # trace all open() syscalls
./opensnoop -T # include timestamps
+ ./opensnoop -U # include UID
./opensnoop -x # only show failed opens
./opensnoop -p 181 # only trace PID 181
./opensnoop -t 123 # only trace TID 123
+ ./opensnoop -u 1000 # only trace UID 1000
./opensnoop -d 10 # trace for 10 seconds only
./opensnoop -n main # only print process names containing "main"
./opensnoop -e # show extended fields
@@ -40,12 +43,16 @@
epilog=examples)
parser.add_argument("-T", "--timestamp", action="store_true",
help="include timestamp on output")
+parser.add_argument("-U", "--print-uid", action="store_true",
+ help="print UID column")
parser.add_argument("-x", "--failed", action="store_true",
help="only show failed opens")
parser.add_argument("-p", "--pid",
help="trace this PID only")
parser.add_argument("-t", "--tid",
help="trace this TID only")
+parser.add_argument("-u", "--uid",
+ help="trace this UID only")
parser.add_argument("-d", "--duration",
help="total duration of trace in seconds")
parser.add_argument("-n", "--name",
@@ -86,6 +93,7 @@
struct data_t {
u64 id;
u64 ts;
+ u32 uid;
int ret;
char comm[TASK_COMM_LEN];
char fname[NAME_MAX];
@@ -101,8 +109,10 @@
u64 id = bpf_get_current_pid_tgid();
u32 pid = id >> 32; // PID is higher part
u32 tid = id; // Cast and get the lower part
+ u32 uid = bpf_get_current_uid_gid();
PID_TID_FILTER
+ UID_FILTER
FLAGS_FILTER
if (bpf_get_current_comm(&val.comm, sizeof(val.comm)) == 0) {
val.id = id;
@@ -131,6 +141,7 @@
bpf_probe_read(&data.fname, sizeof(data.fname), (void *)valp->fname);
data.id = valp->id;
data.ts = tsp / 1000;
+ data.uid = bpf_get_current_uid_gid();
data.flags = valp->flags; // EXTENDED_STRUCT_MEMBER
data.ret = PT_REGS_RC(ctx);
@@ -148,6 +159,11 @@
'if (pid != %s) { return 0; }' % args.pid)
else:
bpf_text = bpf_text.replace('PID_TID_FILTER', '')
+if args.uid:
+ bpf_text = bpf_text.replace('UID_FILTER',
+ 'if (uid != %s) { return 0; }' % args.uid)
+else:
+ bpf_text = bpf_text.replace('UID_FILTER', '')
if args.flag_filter:
bpf_text = bpf_text.replace('FLAGS_FILTER',
'if (!(flags & %d)) { return 0; }' % flag_filter_mask)
@@ -173,6 +189,7 @@
_fields_ = [
("id", ct.c_ulonglong),
("ts", ct.c_ulonglong),
+ ("uid", ct.c_uint32),
("ret", ct.c_int),
("comm", ct.c_char * TASK_COMM_LEN),
("fname", ct.c_char * NAME_MAX),
@@ -184,6 +201,8 @@
# header
if args.timestamp:
print("%-14s" % ("TIME(s)"), end="")
+if args.print_uid:
+ print("%-6s" % ("UID"), end="")
print("%-6s %-16s %4s %3s " %
("TID" if args.tid else "PID", "COMM", "FD", "ERR"), end="")
if args.extended_fields:
@@ -216,6 +235,9 @@
delta = event.ts - initial_ts
print("%-14.9f" % (float(delta) / 1000000), end="")
+ if args.print_uid:
+ print("%-6d" % event.uid, end="")
+
print("%-6d %-16s %4d %3d " %
(event.id & 0xffffffff if args.tid else event.id >> 32,
event.comm.decode('utf-8', 'replace'), fd_s, err), end="")
diff --git a/tools/opensnoop_example.txt b/tools/opensnoop_example.txt
index dc515e5..c504ba4 100644
--- a/tools/opensnoop_example.txt
+++ b/tools/opensnoop_example.txt
@@ -65,6 +65,27 @@
second.
+The -U option include UID on output:
+
+# ./opensnoop -U
+UID PID COMM FD ERR PATH
+0 27063 vminfo 5 0 /var/run/utmp
+103 628 dbus-daemon -1 2 /usr/local/share/dbus-1/system-services
+103 628 dbus-daemon 18 0 /usr/share/dbus-1/system-services
+103 628 dbus-daemon -1 2 /lib/dbus-1/system-services
+
+
+The -u option filtering UID:
+
+# ./opensnoop -Uu 1000
+UID PID COMM FD ERR PATH
+1000 30240 ls 3 0 /etc/ld.so.cache
+1000 30240 ls 3 0 /lib/x86_64-linux-gnu/libselinux.so.1
+1000 30240 ls 3 0 /lib/x86_64-linux-gnu/libc.so.6
+1000 30240 ls 3 0 /lib/x86_64-linux-gnu/libpcre.so.3
+1000 30240 ls 3 0 /lib/x86_64-linux-gnu/libdl.so.2
+1000 30240 ls 3 0 /lib/x86_64-linux-gnu/libpthread.so.0
+
The -x option only prints failed opens:
# ./opensnoop -x
@@ -172,9 +193,11 @@
optional arguments:
-h, --help show this help message and exit
-T, --timestamp include timestamp on output
+ -U, --print-uid include UID on output
-x, --failed only show failed opens
-p PID, --pid PID trace this PID only
-t TID, --tid TID trace this TID only
+ -u UID, --uid UID trace this UID only
-d DURATION, --duration DURATION
total duration of trace in seconds
-n NAME, --name NAME only print process names containing this name
@@ -186,9 +209,11 @@
examples:
./opensnoop # trace all open() syscalls
./opensnoop -T # include timestamps
+ ./opensnoop -U # include UID
./opensnoop -x # only show failed opens
./opensnoop -p 181 # only trace PID 181
./opensnoop -t 123 # only trace TID 123
+ ./opensnoop -u 1000 # only trace UID 1000
./opensnoop -d 10 # trace for 10 seconds only
./opensnoop -n main # only print process names containing "main"
./opensnoop -e # show extended fields