github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/test/syscalls/linux/socket_bind_to_device_util.cc (about)

     1  // Copyright 2019 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  #include "test/syscalls/linux/socket_bind_to_device_util.h"
    16  
    17  #include <arpa/inet.h>
    18  #include <fcntl.h>
    19  #include <linux/if_tun.h>
    20  #include <net/if.h>
    21  #include <netinet/in.h>
    22  #include <sys/ioctl.h>
    23  #include <sys/socket.h>
    24  #include <sys/types.h>
    25  #include <sys/un.h>
    26  #include <unistd.h>
    27  
    28  #include <cstdio>
    29  #include <cstring>
    30  #include <map>
    31  #include <memory>
    32  #include <unordered_map>
    33  #include <unordered_set>
    34  #include <utility>
    35  #include <vector>
    36  
    37  #include "test/util/test_util.h"
    38  
    39  namespace gvisor {
    40  namespace testing {
    41  
    42  using std::string;
    43  
    44  PosixErrorOr<std::unique_ptr<Tunnel>> Tunnel::New(string tunnel_name) {
    45    int fd;
    46    RETURN_ERROR_IF_SYSCALL_FAIL(fd = open("/dev/net/tun", O_RDWR));
    47  
    48    // Using `new` to access a non-public constructor.
    49    auto new_tunnel = absl::WrapUnique(new Tunnel(fd));
    50  
    51    ifreq ifr = {};
    52    ifr.ifr_flags = IFF_TUN;
    53    strncpy(ifr.ifr_name, tunnel_name.c_str(), sizeof(ifr.ifr_name));
    54  
    55    RETURN_ERROR_IF_SYSCALL_FAIL(ioctl(fd, TUNSETIFF, &ifr));
    56    new_tunnel->name_ = ifr.ifr_name;
    57    return new_tunnel;
    58  }
    59  
    60  std::unordered_set<string> GetInterfaceNames() {
    61    std::unordered_set<string> names;
    62  #ifndef ANDROID
    63    // Android does not support if_nameindex in r22.
    64    struct if_nameindex* interfaces = if_nameindex();
    65    if (interfaces == nullptr) {
    66      return names;
    67    }
    68    for (auto interface = interfaces;
    69         interface->if_index != 0 || interface->if_name != nullptr; interface++) {
    70      names.insert(interface->if_name);
    71    }
    72    if_freenameindex(interfaces);
    73  #endif
    74    return names;
    75  }
    76  
    77  }  // namespace testing
    78  }  // namespace gvisor