support/testing: add nmap runtime test

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
(cherry picked from commit 5510d2890fc628bf08805f83e3430d759c15a8ec)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -1846,6 +1846,7 @@ F:	support/testing/tests/package/test_netsnmp/
 F:	support/testing/tests/package/test_nftables.py
 F:	support/testing/tests/package/test_nftables/
 F:	support/testing/tests/package/test_ngrep.py
+F:	support/testing/tests/package/test_nmap.py
 F:	support/testing/tests/package/test_ntp.py
 F:	support/testing/tests/package/test_ntp/
 F:	support/testing/tests/package/test_numactl.py

support/testing/tests/package/test_nmap.py

@@ -0,0 +1,42 @@
+import os
+import time
+
+import infra.basetest
+
+
+class TestNmap(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
+        BR2_PACKAGE_NMAP=y
+        BR2_PACKAGE_NMAP_NCAT=y
+        BR2_PACKAGE_NMAP_NMAP=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    def test_run(self):
+        cpio_file = os.path.join(self.builddir, "images", "rootfs.cpio")
+        self.emulator.boot(arch="armv5",
+                           kernel="builtin",
+                           options=["-initrd", cpio_file])
+        self.emulator.login()
+
+        # Check the program can execute.
+        self.assertRunOk("nmap --version")
+
+        # We open few ports, using the nmap netcat "nc" commands.
+        ports = [21, 23, 25, 80]
+        for port in ports:
+            cmd = f"nc -l -p {port} </dev/null &>/dev/null &"
+            self.assertRunOk(cmd)
+
+        time.sleep(1 * self.timeout_multiplier)
+
+        # We run a local port scan. We should see in the output the
+        # ports we previously opened.
+        out, ret = self.emulator.run("nmap -n -sS 127.0.0.1", timeout=20)
+        self.assertEqual(ret, 0)
+        nmap_out = "\n".join(out)
+        for port in ports:
+            self.assertRegex(nmap_out, f"{port}/tcp *open")