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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <sched.h>
#include <sys/utsname.h>
#include <unistd.h>
#include "gtest/gtest.h"
#include "absl/strings/string_view.h"
#include "test/util/capability_util.h"
#include "test/util/test_util.h"
#include "test/util/thread_util.h"
namespace gvisor {
namespace testing {
namespace {
TEST(UnameTest, Sanity) {
struct utsname buf;
ASSERT_THAT(uname(&buf), SyscallSucceeds());
EXPECT_NE(strlen(buf.release), 0);
EXPECT_NE(strlen(buf.version), 0);
EXPECT_NE(strlen(buf.machine), 0);
EXPECT_NE(strlen(buf.sysname), 0);
EXPECT_NE(strlen(buf.nodename), 0);
EXPECT_NE(strlen(buf.domainname), 0);
}
TEST(UnameTest, SetNames) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_ADMIN)));
char hostname[65];
ASSERT_THAT(sethostname("0123456789", 3), SyscallSucceeds());
EXPECT_THAT(gethostname(hostname, sizeof(hostname)), SyscallSucceeds());
EXPECT_EQ(absl::string_view(hostname), "012");
ASSERT_THAT(sethostname("0123456789\0xxx", 11), SyscallSucceeds());
EXPECT_THAT(gethostname(hostname, sizeof(hostname)), SyscallSucceeds());
EXPECT_EQ(absl::string_view(hostname), "0123456789");
ASSERT_THAT(sethostname("0123456789\0xxx", 12), SyscallSucceeds());
EXPECT_THAT(gethostname(hostname, sizeof(hostname)), SyscallSucceeds());
EXPECT_EQ(absl::string_view(hostname), "0123456789");
constexpr char kHostname[] = "wubbalubba";
ASSERT_THAT(sethostname(kHostname, sizeof(kHostname)), SyscallSucceeds());
constexpr char kDomainname[] = "dubdub.com";
ASSERT_THAT(setdomainname(kDomainname, sizeof(kDomainname)),
SyscallSucceeds());
struct utsname buf;
EXPECT_THAT(uname(&buf), SyscallSucceeds());
EXPECT_EQ(absl::string_view(buf.nodename), kHostname);
EXPECT_EQ(absl::string_view(buf.domainname), kDomainname);
// These should just be glibc wrappers that also call uname(2).
EXPECT_THAT(gethostname(hostname, sizeof(hostname)), SyscallSucceeds());
EXPECT_EQ(absl::string_view(hostname), kHostname);
char domainname[65];
EXPECT_THAT(getdomainname(domainname, sizeof(domainname)), SyscallSucceeds());
EXPECT_EQ(absl::string_view(domainname), kDomainname);
}
TEST(UnameTest, UnprivilegedSetNames) {
AutoCapability cap(CAP_SYS_ADMIN, false);
EXPECT_THAT(sethostname("", 0), SyscallFailsWithErrno(EPERM));
EXPECT_THAT(setdomainname("", 0), SyscallFailsWithErrno(EPERM));
}
TEST(UnameTest, UnshareUTS) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_ADMIN)));
struct utsname init;
ASSERT_THAT(uname(&init), SyscallSucceeds());
ScopedThread([&]() {
EXPECT_THAT(unshare(CLONE_NEWUTS), SyscallSucceeds());
constexpr char kHostname[] = "wubbalubba";
EXPECT_THAT(sethostname(kHostname, sizeof(kHostname)), SyscallSucceeds());
char hostname[65];
EXPECT_THAT(gethostname(hostname, sizeof(hostname)), SyscallSucceeds());
});
struct utsname after;
EXPECT_THAT(uname(&after), SyscallSucceeds());
EXPECT_EQ(absl::string_view(after.nodename), init.nodename);
}
} // namespace
} // namespace testing
} // namespace gvisor
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