SockDiag.h revision 195688c127a50d0a1890e5ce55129d75705b0ac0 
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#include <unistd.h>
18#include <sys/socket.h>
19
20#include <linux/netlink.h>
21#include <linux/sock_diag.h>
22#include <linux/inet_diag.h>
23
24#include <functional>
25#include <set>
26
27#include "UidRanges.h"
28
29struct inet_diag_msg;
30class SockDiagTest;
31
32class SockDiag {
33
34  public:
35    static const int kBufferSize = 4096;
36
37    // Callback function that is called once for every socket in the dump. A return value of true
38    // means destroy the socket.
39    typedef std::function<bool(uint8_t proto, const inet_diag_msg *)> DumpCallback;
40
41    struct DestroyRequest {
42        nlmsghdr nlh;
43        inet_diag_req_v2 req;
44    } __attribute__((__packed__));
45
46    SockDiag() : mSock(-1), mWriteSock(-1), mSocketsDestroyed(0) {}
47    bool open();
48    virtual ~SockDiag() { closeSocks(); }
49
50    int sendDumpRequest(uint8_t proto, uint8_t family, uint32_t states);
51    int sendDumpRequest(uint8_t proto, uint8_t family, const char *addrstr);
52    int readDiagMsg(uint8_t proto, const DumpCallback& callback);
53    int sockDestroy(uint8_t proto, const inet_diag_msg *);
54    int destroySockets(const char *addrstr);
55    int destroySockets(uint8_t proto, uid_t uid);
56    int destroySockets(const UidRanges& uidRanges, const std::set<uid_t>& skipUids);
57
58  private:
59    int mSock;
60    int mWriteSock;
61    int mSocketsDestroyed;
62    int sendDumpRequest(uint8_t proto, uint8_t family, uint32_t states, iovec *iov, int iovcnt);
63    int destroySockets(uint8_t proto, int family, const char *addrstr);
64    int destroyLiveSockets(DumpCallback destroy);
65    bool hasSocks() { return mSock != -1 && mWriteSock != -1; }
66    void closeSocks() { close(mSock); close(mWriteSock); mSock = mWriteSock = -1; }
67};
68