Support 'nft -f -' to read from stdin

In libnftables, detect if given filename is '-' and treat it as the
common way of requesting to read from stdin, then open /dev/stdin
instead. (Calling 'nft -f /dev/stdin' worked before as well, but this
makes it official.)

With this in place and bash's support for here strings, review all tests
in tests/shell for needless use of temp files. Note that two categories
of test cases were intentionally left unchanged:

- Tests creating potentially large rulesets to avoid running into shell
  parameter length limits.
- Tests for 'include' directive for obvious reasons.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 3 insertions, 11 deletions

diff --git a/tests/shell/testcases/nft-f/0007action_object_set_segfault_1 b/tests/shell/testcases/nft-f/0007action_object_set_segfault_1
index 3a4183bb..7649a496 100755
--- a/tests/shell/testcases/nft-f/0007action_object_set_segfault_1
+++ b/tests/shell/testcases/nft-f/0007action_object_set_segfault_1
@@ -3,19 +3,11 @@
 # test for a segfault if bad syntax was used in set declaration
 # and the set is referenced in the same batch
 
-tmpfile=$(mktemp)
-if [ ! -w $tmpfile ] ; then
-	echo "Failed to create tmp file" >&2
-	exit 0
-fi
-
-trap "rm -f $tmpfile" EXIT # cleanup if aborted
-
-echo "
+RULESET="
 add table t
 add chain t c
 add set t s {type ipv4_addr\;}
 add rule t c ip saddr @s
-" > $tmpfile
+"
 
-$NFT -f $tmpfile 2>/dev/null
+$NFT -f - <<< $RULESET 2>/dev/null