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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef _NETD_CONSTANTS_H
     18 #define _NETD_CONSTANTS_H
     19 
     20 #include <string>
     21 #include <list>
     22 #include <ifaddrs.h>
     23 #include <netdb.h>
     24 #include <stdarg.h>
     25 
     26 #include <chrono>
     27 
     28 #include <private/android_filesystem_config.h>
     29 
     30 #include "utils/RWLock.h"
     31 
     32 const int PROTECT_MARK = 0x1;
     33 const int MAX_SYSTEM_UID = AID_APP - 1;
     34 
     35 extern const char * const IPTABLES_PATH;
     36 extern const char * const IP6TABLES_PATH;
     37 extern const char * const IP_PATH;
     38 extern const char * const TC_PATH;
     39 extern const char * const OEM_SCRIPT_PATH;
     40 extern const char * const ADD;
     41 extern const char * const DEL;
     42 
     43 enum IptablesTarget { V4, V6, V4V6 };
     44 
     45 int execIptables(IptablesTarget target, ...);
     46 int execIptablesSilently(IptablesTarget target, ...);
     47 int execIptablesRestore(IptablesTarget target, const std::string& commands);
     48 bool isIfaceName(const char *name);
     49 int parsePrefix(const char *prefix, uint8_t *family, void *address, int size, uint8_t *prefixlen);
     50 
     51 #define ARRAY_SIZE(a) (sizeof(a) / sizeof(*(a)))
     52 
     53 #define __INT_STRLEN(i) sizeof(#i)
     54 #define _INT_STRLEN(i) __INT_STRLEN(i)
     55 #define INT32_STRLEN _INT_STRLEN(INT32_MIN)
     56 #define UINT32_STRLEN _INT_STRLEN(UINT32_MAX)
     57 #define UINT32_HEX_STRLEN sizeof("0x12345678")
     58 
     59 #define WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
     60 
     61 const uid_t INVALID_UID = static_cast<uid_t>(-1);
     62 
     63 class Stopwatch {
     64 public:
     65     Stopwatch() : mStart(std::chrono::steady_clock::now()) {}
     66     virtual ~Stopwatch() {};
     67 
     68     float timeTaken() const {
     69         using ms = std::chrono::duration<float, std::ratio<1, 1000>>;
     70         return (std::chrono::duration_cast<ms>(
     71                 std::chrono::steady_clock::now() - mStart)).count();
     72     }
     73 
     74 private:
     75     std::chrono::time_point<std::chrono::steady_clock> mStart;
     76 };
     77 
     78 
     79 struct AddrinfoDeleter {
     80     void operator()(struct addrinfo* p) const {
     81         if (p != nullptr) {
     82             freeaddrinfo(p);
     83         }
     84     }
     85 };
     86 
     87 typedef std::unique_ptr<struct addrinfo, struct AddrinfoDeleter> ScopedAddrinfo;
     88 
     89 
     90 struct IfaddrsDeleter {
     91     void operator()(struct ifaddrs *p) const {
     92         if (p != nullptr) {
     93             freeifaddrs(p);
     94         }
     95     }
     96 };
     97 
     98 typedef std::unique_ptr<struct ifaddrs, struct IfaddrsDeleter> ScopedIfaddrs;
     99 
    100 namespace android {
    101 namespace net {
    102 
    103 /**
    104  * This lock exists to make NetdNativeService RPCs (which come in on multiple Binder threads)
    105  * coexist with the commands in CommandListener.cpp. These are presumed not thread-safe because
    106  * CommandListener has only one user (NetworkManagementService), which is connected through a
    107  * FrameworkListener that passes in commands one at a time.
    108  */
    109 extern android::RWLock gBigNetdLock;
    110 
    111 }  // namespace net
    112 }  // namespace android
    113 
    114 #endif  // _NETD_CONSTANTS_H
    115