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// Copyright 2021 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 <linux/capability.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include "test/syscalls/linux/socket_netlink_util.h"
#include "test/util/capability_util.h"
#include "test/util/posix_error.h"
#include "test/util/socket_util.h"
namespace gvisor {
namespace testing {
// SetupContainer sets up the networking settings in the current container.
PosixError SetupContainer() {
const PosixErrorOr<bool> have_net_admin = HaveCapability(CAP_NET_ADMIN);
if (!have_net_admin.ok()) {
std::cerr << "Cannot determine if we have CAP_NET_ADMIN." << std::endl;
return have_net_admin.error();
}
if (have_net_admin.ValueOrDie() && !IsRunningOnGvisor()) {
PosixErrorOr<FileDescriptor> sockfd = Socket(AF_INET, SOCK_DGRAM, 0);
if (!sockfd.ok()) {
std::cerr << "Cannot open socket." << std::endl;
return sockfd.error();
}
int sock = sockfd.ValueOrDie().get();
struct ifreq ifr = {};
strncpy(ifr.ifr_name, "lo", IFNAMSIZ);
if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
std::cerr << "Cannot get 'lo' flags: " << strerror(errno) << std::endl;
return PosixError(errno);
}
if ((ifr.ifr_flags & IFF_UP) == 0) {
ifr.ifr_flags |= IFF_UP;
if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
std::cerr << "Cannot set 'lo' as UP: " << strerror(errno) << std::endl;
return PosixError(errno);
}
}
}
return NoError();
}
} // namespace testing
} // namespace gvisor
using ::gvisor::testing::SetupContainer;
// Binary setup_container initializes the container environment in which tests
// with container=True will run, then execs the actual test binary.
// Usage:
// ./setup_container test_binary [arguments forwarded to test_binary...]
int main(int argc, char *argv[], char *envp[]) {
if (!SetupContainer().ok()) {
return 1;
}
if (argc < 2) {
std::cerr << "Must provide arguments to exec." << std::endl;
return 2;
}
if (execve(argv[1], &argv[1], envp) == -1) {
std::cerr << "execv returned errno " << errno << std::endl;
return 1;
}
}
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