** Description changed:
[Impact]
- * ss can't filter using single entries in parentheses
+ * ss won't be able to run commands with single filters inside
+ parentheses, like: "( sport == :X )", for example.
+
+ * A workaround is to remove "( )" from single filters, since it looks
+ the issue does not affect 2 filters being put together in the same
+ parentheses, like: " ( X and Y ) and Y " instead of ( X and Y ) and ( Y
+ )".
+
+ * CTDB is unable to use ss filter to obtain nodes public IP addresses
+ in order to fail over services (LP: #722201).
[Test Case]
- * ss -tn state established "( src [172.16.17.2] || src [172.16.17.3] )" "(
sport == :2049 )"
- * test case was discovered during CTDB scripts execution
+ * Having an Ubuntu Cosmic, Disco or Eoan, try to execute the following
+ command:
+
+ $ ss -tn state established "( src [172.16.17.2] || src [172.16.17.3] )"
+ "( sport == :2049 )"
+
+ Independent of the IPs or ports being used. Copying and pasting the
+ command should be enough for you to know if you are affected.
+
+ Bad Result:
+
+ ss: bison bellows (while parsing filter): "syntax error!" Sorry.
+ Usage: ss [ OPTIONS ]
+ ss [ OPTIONS ] [ FILTER ]
+ -h, --help this message
+ ...
+
+ Expected Result:
+
+ Recv-Q Send-Q Local Address:Port
Peer Address:Port
+ ...
+
+ * test case was discovered during CTDB scripts execution
[Regression Potential]
- * ss interpreter (bison powered) could be broken
- * patch is based in an upstream fix and was tested
- * would likely not jeopardize ip command (higher issues)
+ * biggest risk would be to affect ss interpreter (worst case scenario).
+ * the proposed patch is based in upstream fix and was tested against the
same issue reported as the reproducer (above) and some other generic ss
commands.
+ * any problem here is unlikely to change iproute2 most important command
interpreter, "ip", since the patch is applied against ss code.
[Other Info]
-
+
ORIGINAL DESCRIPTION:
Investigating an issue for CTDB (LP: #722201), after suggesting a fix on
ss syntax to CTDB upstream project, we discovered that "ss" seems to be
broken in Ubuntu since Ubuntu Cosmic:
----
# Debian Sid
inaddy@workstation:~$ ss -tn state established "( src [172.16.17.2] || src
[172.16.17.3] )" "( sport == :2049 )"
Recv-Q Send-Q Local Address:Port
Peer Address:Port
# Ubuntu Ubuntu 16.04 LTS (Xenial Xerus)
(c)inaddy@xenial:~$ ss -tn state established "( src [172.16.17.2] || src
[172.16.17.3] )" "( sport == :2049 )"
Recv-Q Send-Q Local Address:Port
Peer Address:Port
# Ubuntu 18.04 LTS (Bionic Beaver)
(c)inaddy@bionic:~$ ss -tn state established "( src [172.16.17.2] || src
[172.16.17.3] )" "( sport == :2049 )"
Recv-Q Send-Q Local Address:Port
Peer Address:Port
# Ubuntu 18.10 (Cosmic Cuttlefish)
(c)inaddy@cosmic:~$ ss -tn state established "( src [172.16.17.2] || src
[172.16.17.3] )" "( sport == :2049 )"
ss: bison bellows (while parsing filter): "syntax error!" Sorry.
Usage: ss [ OPTIONS ]
ss [ OPTIONS ] [ FILTER ]
-h, --help this message
# Ubuntu 19.04 (Disco Dingo)
(c)inaddy@disco:~$ ss -tn state established "( src [172.16.17.2] || src
[172.16.17.3] )" "( sport == :2049 )"
ss: bison bellows (while parsing filter): "syntax error!" Sorry.
Usage: ss [ OPTIONS ]
ss [ OPTIONS ] [ FILTER ]
# Ubuntu 19.10 (Eoan Ermine)
(c)inaddy@eoan:~$ ss -tn state established "( src [172.16.17.2] || src
[172.16.17.3] )" "( sport == :2049 )"
ss: bison bellows (while parsing filter): "syntax error!" Sorry.
Usage: ss [ OPTIONS ]
ss [ OPTIONS ] [ FILTER ]
----
I have generated a pkg using upstream iproute2 source code and it does
not suffer the issue. I have generated a package using Ubuntu cosmic
source package, without debian/patches/*, and verified the issue still
persists (not being introduced by any of our packages, and being present
if vanilla upstream version used in Cosmic).
--
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https://bugs.launchpad.net/bugs/1831775
Title:
ss seems broken when using multiple filters in the same cmdline
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