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Bug 1761534 - TestOnly: symbolic variables not working in interactive mode
Summary: TestOnly: symbolic variables not working in interactive mode
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: nftables
Version: 8.1
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: 8.2
Assignee: Phil Sutter
QA Contact: qe-baseos-daemons
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-10-14 15:23 UTC by Tomas Dolezal
Modified: 2023-04-11 16:39 UTC (History)
1 user (show)

Fixed In Version: nftables-0.9.3-4.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-04-28 16:42:15 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-30821 0 None None None 2023-04-11 16:39:16 UTC
Red Hat Product Errata RHEA-2020:1774 0 None None None 2020-04-28 16:42:33 UTC

Description Tomas Dolezal 2019-10-14 15:23:10 UTC 
Description of problem:
symbolic variables are available in scripts but cannot be used if lines are executed sequentially in interactive mode. documentation is not 

Version-Release number of selected component (if applicable):
nftables-0.9.0-14.el8.x86_64

How reproducible:
always

Steps to Reproduce:
cat > variable.nft <<EOF
#!/usr/sbin/nft -f

add table inet test_table
add chain inet test_table test_chain

define DNS_SERVERS = { 192.0.2.1, 192.0.2.2 }
add rule inet test_table test_chain ip daddr $DNS_SERVERS accept
EOF

this script can be successfully executed and loads DNS_SERVERS variable.
when executed line-by-line in interactive mode `nft -i`:
nft> add rule inet test_table test_chain ip daddr $DNS_SERVERS accept
Error: unknown identifier 'DNS_SERVERS'
add rule inet test_table test_chain ip daddr $DNS_SERVERS accept
                                              ^^^^^^^^^^^
nft> 

Actual results:
reference to a defined variable (without a failure) leads to dereference error "Error: unknown identifier"

Expected results:
variables should be supported also in interactive mode for script debugging

Additional info:
include statement works in interactive mode
Comment 1 Tomas Dolezal 2019-10-14 16:50:28 UTC 
command:
>define DNS_SERVERS = { 192.0.2.1, 192.0.2.2 }; add rule inet example_table example_chain ip daddr $DNS_SERVERS accept
apparently works because the context of variable is apparently ended by EOF

ref 'nft --debug all --interactive' after sole define command
Stack now 0
Entering state 1
Reading a token: --(end of buffer or a NUL)
--EOF (start condition 0)
Now at end of input.
Shifting token "end of file" (: )
Entering state 2
Stack now 0 1 2
Cleanup: popping token "end of file" (: )
Cleanup: popping nterm input (: )


Is there a way to preserve context so that the variable could be used later on during interactive execution?
Comment 2 Phil Sutter 2019-10-30 21:00:43 UTC 
Fix sent upstream: https://lore.kernel.org/netfilter-devel/20191030205905.12779-1-phil@nwl.cc/
Comment 3 Phil Sutter 2019-11-07 12:22:44 UTC 
Upstream commit to backport:

commit 332325e3c3fab4c25bb5f387f9663205f63748dc
Author: Phil Sutter <phil>
Date:   Wed Oct 30 21:45:39 2019 +0100

    libnftables: Store top_scope in struct nft_ctx
    
    Allow for interactive sessions to make use of defines. Since parser is
    initialized for each line, top scope defines didn't persist although
    they are actually useful for stuff like:
    
    | # nft -i
    | define goodports = { 22, 23, 80, 443 }
    | add rule inet t c tcp dport $goodports accept
    | add rule inet t c tcp sport $goodports accept
    
    While being at it, introduce scope_alloc() and scope_free().
    
    Signed-off-by: Phil Sutter <phil>
    Acked-by: Pablo Neira Ayuso <pablo>
Comment 4 Phil Sutter 2019-12-06 16:28:43 UTC 
Implicitly fixed by rebase to 0.9.3 release.
Comment 6 errata-xmlrpc 2020-04-28 16:42:15 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:1774
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