support/testing/tests/package/test_nftables.py: new runtime test
This runtime test was suggested in discussion [1]. It should detect
potential runtime failures such as the one fixed in commit eb74998125
"package/nftables: fix the build of the pyhon bindings".
We need a special kernel, because not all nftables-related options are
enabled in the pre-built one.
[1] https://lists.buildroot.org/pipermail/buildroot/2023-August/672864.html
Cc: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
master
Julien Olivain
Yann E. MORIN
parent
9ba399a3dd
commit
f4da6c3ebe
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@ -1776,6 +1776,8 @@ F: support/testing/tests/package/test_lz4.py
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F: support/testing/tests/package/test_lzop.py
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F: support/testing/tests/package/test_mtools.py
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F: support/testing/tests/package/test_ncdu.py
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F: support/testing/tests/package/test_nftables.py
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F: support/testing/tests/package/test_nftables/
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F: support/testing/tests/package/test_octave.py
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F: support/testing/tests/package/test_ola.py
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F: support/testing/tests/package/test_ola/
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@ -0,0 +1,109 @@
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import os
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import infra.basetest
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class TestNftables(infra.basetest.BRTest):
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config = \
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"""
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BR2_aarch64=y
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BR2_TOOLCHAIN_EXTERNAL=y
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BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
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BR2_LINUX_KERNEL=y
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BR2_LINUX_KERNEL_CUSTOM_VERSION=y
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BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.1.46"
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BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
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BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/aarch64-virt/linux.config"
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BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
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BR2_PACKAGE_NFTABLES=y
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BR2_PACKAGE_PYTHON3=y
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BR2_ROOTFS_OVERLAY="{}"
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BR2_TARGET_ROOTFS_CPIO=y
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BR2_TARGET_ROOTFS_CPIO_GZIP=y
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# BR2_TARGET_ROOTFS_TAR is not set
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""".format(
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infra.filepath("tests/package/test_nftables/rootfs-overlay"))
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def nftables_test(self, prog="nft"):
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# Table/Chain names for the test
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nft_table = "br_ip_table"
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nft_chain = "br_ip_chain_in"
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# We flush all nftables rules, to start from a known state.
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self.assertRunOk(f"{prog} flush ruleset")
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# We create an ip table.
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self.assertRunOk(f"{prog} add table ip {nft_table}")
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# We should be able to list this table.
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list_cmd = f"{prog} list tables ip"
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output, exit_code = self.emulator.run(list_cmd)
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self.assertEqual(exit_code, 0)
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self.assertIn(nft_table, output[0])
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# We create an ip input chain in our table.
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cmd = f"{prog} add chain ip"
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cmd += f" {nft_table} {nft_chain}"
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cmd += " { type filter hook input priority 0 \\; }"
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self.assertRunOk(cmd)
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# We list our chain.
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cmd = f"{prog} list chain ip {nft_table} {nft_chain}"
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self.assertRunOk(cmd)
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# We add a filter rule to drop pings (icmp echo-requests) to
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# the 127.0.0.2 destination.
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cmd = f"{prog} add rule ip {nft_table} {nft_chain}"
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cmd += " ip daddr 127.0.0.2 icmp type echo-request drop"
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self.assertRunOk(cmd)
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# We list our rule.
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self.assertRunOk(f"{prog} list ruleset ip")
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# A ping to 127.0.0.1 is expected to work, because it's not
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# matching our rule. We expect 3 replies (-c), with 0.5s
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# internal (-i), and set a maximum timeout of 2s.
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ping_cmd_prefix = "ping -c 3 -i 0.5 -W 2 "
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self.assertRunOk(ping_cmd_prefix + "127.0.0.1")
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# A ping to 127.0.0.2 is expected to fail, because our rule is
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# supposed to drop it.
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ping_test_cmd = ping_cmd_prefix + "127.0.0.2"
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_, exit_code = self.emulator.run(ping_test_cmd)
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self.assertNotEqual(exit_code, 0)
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# We completely delete the table. This should also delete the
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# chain and the rule.
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self.assertRunOk(f"{prog} delete table ip {nft_table}")
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# We should no longer see the table in the list.
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output, exit_code = self.emulator.run(list_cmd)
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self.assertEqual(exit_code, 0)
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self.assertNotIn(nft_table, "\n".join(output))
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# Since we deleted the rule, the ping test command which was
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# supposed to fail earlier is now supposed to succeed.
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self.assertRunOk(ping_test_cmd)
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def test_run(self):
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img = os.path.join(self.builddir, "images", "rootfs.cpio.gz")
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kern = os.path.join(self.builddir, "images", "Image")
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self.emulator.boot(arch="aarch64",
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kernel=kern,
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kernel_cmdline=["console=ttyAMA0"],
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options=["-M", "virt",
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"-cpu", "cortex-a57",
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"-m", "256M",
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"-initrd", img])
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self.emulator.login()
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# We check the program can execute.
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self.assertRunOk("nft --version")
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# We run the nftables test sequence using the default "nft"
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# user space configuration tool.
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self.nftables_test()
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# We run again the same test sequence using our simple nft
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# python implementation, to check the language bindings.
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self.nftables_test(prog="/root/nft.py")
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@ -0,0 +1,22 @@
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#! /usr/bin/env python3
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#
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# This is a simple reimplementation of the "nft" user-space tool in
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# Python, in order to test language bindings. It does not support any
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# command line argument supported by the nftables "nft" tool, but
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# supports all nftables commands used in the Buildroot runtime test.
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import sys
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import nftables
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nft = nftables.nftables.Nftables()
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cmd = " ".join(sys.argv[1:])
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ret_code, output, error = nft.cmd(cmd)
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if len(output) > 0:
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print(output.strip())
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if len(error) > 0:
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print(error.strip())
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sys.exit(ret_code)
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