As a follow up on the patch on Linux: de4eceab578e
("smb3: allow dumping session and tcon id to improve stats analysis
and debugging") [1]
Add `gettconinfo` command to dump both the TCON Id and Session Id of
a given SMB mount; to help with correlation in cases when multiple
mounts are to the same share.
Example run:
```
./smbinfo gettconinfo /mnt/smb_share
TCON Id: 0x1
Session Id: 0xa40000000001
```
[1] https://github.com/torvalds/linux/commit/de4eceab578ead12a71e5b5588a57e142bbe8ceb
Cc: Pavel Shilovsky <pshilovsky@xxxxxxxxx>
Cc: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Anthony Nandaa <profnandaa@xxxxxxxxx>
---
smbinfo | 29 +++++++++++++++++++++++++++++
smbinfo.rst | 2 ++
2 files changed, 31 insertions(+)
diff --git a/smbinfo b/smbinfo
index 73c5bb3..3467b0b 100755
--- a/smbinfo
+++ b/smbinfo
@@ -35,6 +35,7 @@ CIFS_QUERY_INFO = 0xc018cf07
CIFS_ENUMERATE_SNAPSHOTS = 0x800ccf06
CIFS_DUMP_KEY = 0xc03acf08
CIFS_DUMP_FULL_KEY = 0xc011cf0a
+CIFS_GET_TCON_INFO = 0x800ccf0c
# large enough input buffer length
INPUT_BUFFER_LENGTH = 16384
@@ -289,6 +290,10 @@ def main():
sap.add_argument("file")
sap.set_defaults(func=cmd_keys)
+ sap = subp.add_parser("gettconinfo", help="Prints TCON Id and Session Id for a cifs file")
+ sap.add_argument("file")
+ sap.set_defaults(func=cmd_gettconinfo)
+
# parse arguments
args = ap.parse_args()
@@ -876,5 +881,29 @@ def cmd_keys(args):
print("ServerIn Key: %s"%bytes_to_hex(kd.server_in_key))
print("ServerOut key: %s"%bytes_to_hex(kd.server_out_key))
+class SmbMntTconInfoStruct:
+ def __init__(self):
+ self.tid = 0
+ self.session_id = 0
+
+ def ioctl(self, fd):
+ buf = bytearray()
+ buf.extend(struct.pack("=IQ", self.tid, self.session_id))
+ fcntl.ioctl(fd, CIFS_GET_TCON_INFO, buf, True)
+ (self.tid, self.session_id) = struct.unpack_from('=IQ', buf, 0)
+
+def cmd_gettconinfo(args):
+ fd = os.open(args.file, os.O_RDONLY)
+ tcon = SmbMntTconInfoStruct()
+
+ try:
+ tcon.ioctl(fd)
+ except Exception as e:
+ print("syscall failed: %s"%e)
+ return False
+
+ print("TCON Id: 0x%x"%tcon.tid)
+ print("Session Id: 0x%x"%tcon.session_id)
+
if __name__ == '__main__':
main()
diff --git a/smbinfo.rst b/smbinfo.rst
index 1acf3c4..17270c5 100644
--- a/smbinfo.rst
+++ b/smbinfo.rst
@@ -96,6 +96,8 @@ COMMAND
the SMB3 traffic of this mount can be decryped e.g. via wireshark
(requires root).
+`gettconinfo`: Prints both the TCON Id and Session Id for a cifs file.
+
*****
NOTES
*****
--
2.34.1
