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 int execIptablesRestoreWithOutput(IptablesTarget target, const std::string& commands,
49                                   std::string *output);
50 int execIptablesRestoreCommand(IptablesTarget target, const std::string& table,
51                                const std::string& command, std::string *output);
52 bool isIfaceName(const char *name);
53 int parsePrefix(const char *prefix, uint8_t *family, void *address, int size, uint8_t *prefixlen);
54 void blockSigpipe();
55 
56 #define ARRAY_SIZE(a) (sizeof(a) / sizeof(*(a)))
57 
58 #define __INT_STRLEN(i) sizeof(#i)
59 #define _INT_STRLEN(i) __INT_STRLEN(i)
60 #define INT32_STRLEN _INT_STRLEN(INT32_MIN)
61 #define UINT32_STRLEN _INT_STRLEN(UINT32_MAX)
62 #define UINT32_HEX_STRLEN sizeof("0x12345678")
63 
64 #define WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
65 
66 const uid_t INVALID_UID = static_cast<uid_t>(-1);
67 
68 
69 struct AddrinfoDeleter {
operatorAddrinfoDeleter70     void operator()(struct addrinfo* p) const {
71         if (p != nullptr) {
72             freeaddrinfo(p);
73         }
74     }
75 };
76 
77 typedef std::unique_ptr<struct addrinfo, struct AddrinfoDeleter> ScopedAddrinfo;
78 
79 
80 struct IfaddrsDeleter {
operatorIfaddrsDeleter81     void operator()(struct ifaddrs *p) const {
82         if (p != nullptr) {
83             freeifaddrs(p);
84         }
85     }
86 };
87 
88 typedef std::unique_ptr<struct ifaddrs, struct IfaddrsDeleter> ScopedIfaddrs;
89 
90 namespace android {
91 namespace net {
92 
93 /**
94  * This lock exists to make NetdNativeService RPCs (which come in on multiple Binder threads)
95  * coexist with the commands in CommandListener.cpp. These are presumed not thread-safe because
96  * CommandListener has only one user (NetworkManagementService), which is connected through a
97  * FrameworkListener that passes in commands one at a time.
98  */
99 extern android::RWLock gBigNetdLock;
100 
101 }  // namespace net
102 }  // namespace android
103 
104 #endif  // _NETD_CONSTANTS_H
105