Allow syscall tests to run with hostinet.

Fixes #1207

PiperOrigin-RevId: 283914438

test/syscalls/build_defs.bzl

@@ -9,6 +9,7 @@ def syscall_test(
         use_tmpfs = False,
         add_overlay = False,
         add_uds_tree = False,
+        add_hostinet = False,
         tags = None):
     _syscall_test(
         test = test,
@@ -65,6 +66,18 @@ def syscall_test(
             file_access = "shared",
         )
 
+    if add_hostinet:
+        _syscall_test(
+            test = test,
+            shard_count = shard_count,
+            size = size,
+            platform = "ptrace",
+            use_tmpfs = use_tmpfs,
+            network = "host",
+            add_uds_tree = add_uds_tree,
+            tags = tags,
+        )
+
 def _syscall_test(
         test,
         shard_count,
@@ -72,6 +85,7 @@ def _syscall_test(
         platform,
         use_tmpfs,
         tags,
+        network = "none",
         file_access = "exclusive",
         overlay = False,
         add_uds_tree = False):
@@ -85,6 +99,8 @@ def _syscall_test(
         name += "_shared"
     if overlay:
         name += "_overlay"
+    if network != "none":
+        name += "_" + network + "net"
 
     if tags == None:
         tags = []
@@ -107,6 +123,7 @@ def _syscall_test(
         # Arguments are passed directly to syscall_test_runner binary.
         "--test-name=" + test_name,
         "--platform=" + platform,
+        "--network=" + network,
         "--use-tmpfs=" + str(use_tmpfs),
         "--file-access=" + file_access,
         "--overlay=" + str(overlay),

test/syscalls/syscall_test_runner.go

@@ -46,6 +46,7 @@ var (
 	debug      = flag.Bool("debug", false, "enable debug logs")
 	strace     = flag.Bool("strace", false, "enable strace logs")
 	platform   = flag.String("platform", "ptrace", "platform to run on")
+	network    = flag.String("network", "none", "network stack to run on (sandbox, host, none)")
 	useTmpfs   = flag.Bool("use-tmpfs", false, "mounts tmpfs for /tmp")
 	fileAccess = flag.String("file-access", "exclusive", "mounts root in exclusive or shared mode")
 	overlay    = flag.Bool("overlay", false, "wrap filesystem mounts with writable tmpfs overlay")
@@ -137,7 +138,7 @@ func runRunsc(tc gtest.TestCase, spec *specs.Spec) error {
 
 	args := []string{
 		"-root", rootDir,
-		"-network=none",
+		"-network", *network,
 		"-log-format=text",
 		"-TESTONLY-unsafe-nonroot=true",
 		"-net-raw=true",
@@ -335,10 +336,11 @@ func runTestCaseRunsc(testBin string, tc gtest.TestCase, t *testing.T) {
 		})
 	}
 
-	// Set environment variable that indicates we are
-	// running in gVisor and with the given platform.
+	// Set environment variables that indicate we are
+	// running in gVisor with the given platform and network.
 	platformVar := "TEST_ON_GVISOR"
-	env := append(os.Environ(), platformVar+"="+*platform)
+	networkVar := "GVISOR_NETWORK"
+	env := append(os.Environ(), platformVar+"="+*platform, networkVar+"="+*network)
 
 	// Remove env variables that cause the gunit binary to write output
 	// files, since they will stomp on eachother, and on the output files

test/util/test_util.cc

@@ -41,6 +41,7 @@ namespace gvisor {
 namespace testing {
 
 #define TEST_ON_GVISOR "TEST_ON_GVISOR"
+#define GVISOR_NETWORK "GVISOR_NETWORK"
 
 bool IsRunningOnGvisor() { return GvisorPlatform() != Platform::kNative; }
 
@@ -60,6 +61,11 @@ Platform GvisorPlatform() {
   abort();
 }
 
+bool IsRunningWithHostinet() {
+  char* env = getenv(GVISOR_NETWORK);
+  return env && strcmp(env, "host") == 0;
+}
+
 // Inline cpuid instruction.  Preserve %ebx/%rbx register. In PIC compilations
 // %ebx contains the address of the global offset table. %rbx is occasionally
 // used to address stack variables in presence of dynamic allocas.

test/util/test_util.h

@@ -220,6 +220,7 @@ enum class Platform {
 };
 bool IsRunningOnGvisor();
 Platform GvisorPlatform();
+bool IsRunningWithHostinet();
 
 #ifdef __linux__
 void SetupGvisorDeathTest();