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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.
#ifdef __Fuchsia__
#include <netinet/if_ether.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include "test/util/socket_util.h"
namespace gvisor {
namespace testing {
// On Linux, access to raw IP and packet socket is controlled by a single
// capability (CAP_NET_RAW). However on Fuchsia, access to raw IP and packet
// sockets are controlled by separate capabilities/protocols.
namespace {
PosixErrorOr<bool> HaveSocketCapability(int domain, int type, int protocol) {
// Fuchsia does not have a platform supported way to check the protocols made
// available to a sandbox. As a workaround, simply try to create the specified
// socket and assume no access if we get a no permissions error.
auto s = Socket(domain, type, protocol);
if (s.ok()) {
return true;
}
if (s.error().errno_value() == EPERM) {
return false;
}
return s.error();
}
} // namespace
PosixErrorOr<bool> HaveRawIPSocketCapability() {
static PosixErrorOr<bool> result(false);
static std::once_flag once;
std::call_once(once, [&]() {
result = HaveSocketCapability(AF_INET, SOCK_RAW, IPPROTO_UDP);
});
return result;
}
PosixErrorOr<bool> HavePacketSocketCapability() {
static PosixErrorOr<bool> result(false);
static std::once_flag once;
std::call_once(once, [&]() {
result = HaveSocketCapability(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
});
return result;
}
} // namespace testing
} // namespace gvisor
#endif // __Fuchsia__
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