1 /* 2 * Copyright (C) 2016 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 _SOCK_DIAG_H 18 #define _SOCK_DIAG_H 19 20 #include <unistd.h> 21 #include <sys/socket.h> 22 23 #include <linux/netlink.h> 24 #include <linux/sock_diag.h> 25 #include <linux/inet_diag.h> 26 27 #include <functional> 28 #include <set> 29 30 #include "Permission.h" 31 #include "UidRanges.h" 32 33 struct inet_diag_msg; 34 class SockDiagTest; 35 36 class SockDiag { 37 38 public: 39 static const int kBufferSize = 4096; 40 41 // Callback function that is called once for every socket in the dump. A return value of true 42 // means destroy the socket. 43 typedef std::function<bool(uint8_t proto, const inet_diag_msg *)> DumpCallback; 44 45 struct DestroyRequest { 46 nlmsghdr nlh; 47 inet_diag_req_v2 req; 48 } __attribute__((__packed__)); 49 SockDiag()50 SockDiag() : mSock(-1), mWriteSock(-1), mSocketsDestroyed(0) {} 51 bool open(); ~SockDiag()52 virtual ~SockDiag() { closeSocks(); } 53 54 int sendDumpRequest(uint8_t proto, uint8_t family, uint32_t states); 55 int sendDumpRequest(uint8_t proto, uint8_t family, const char *addrstr); 56 int readDiagMsg(uint8_t proto, DumpCallback callback); 57 int sockDestroy(uint8_t proto, const inet_diag_msg *); 58 // Destroys all sockets on the given IPv4 or IPv6 address. 59 int destroySockets(const char *addrstr); 60 // Destroys all sockets for the given protocol and UID. 61 int destroySockets(uint8_t proto, uid_t uid, bool excludeLoopback); 62 // Destroys all "live" (CONNECTED, SYN_SENT, SYN_RECV) TCP sockets for the given UID ranges. 63 int destroySockets(const UidRanges& uidRanges, const std::set<uid_t>& skipUids, 64 bool excludeLoopback); 65 // Destroys all "live" (CONNECTED, SYN_SENT, SYN_RECV) TCP sockets that no longer have 66 // the permissions required by the specified network. 67 int destroySocketsLackingPermission(unsigned netId, Permission permission, 68 bool excludeLoopback); 69 70 private: 71 friend class SockDiagTest; 72 int mSock; 73 int mWriteSock; 74 int mSocketsDestroyed; 75 int sendDumpRequest(uint8_t proto, uint8_t family, uint32_t states, iovec *iov, int iovcnt); 76 int destroySockets(uint8_t proto, int family, const char *addrstr); 77 int destroyLiveSockets(DumpCallback destroy, const char *what, iovec *iov, int iovcnt); hasSocks()78 bool hasSocks() { return mSock != -1 && mWriteSock != -1; } closeSocks()79 void closeSocks() { close(mSock); close(mWriteSock); mSock = mWriteSock = -1; } 80 static bool isLoopbackSocket(const inet_diag_msg *msg); 81 }; 82 83 #endif // _SOCK_DIAG_H 84