/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _SOCK_DIAG_H
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#define _SOCK_DIAG_H
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#include <unistd.h>
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#include <sys/socket.h>
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#include <linux/netlink.h>
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#include <linux/sock_diag.h>
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#include <linux/inet_diag.h>
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#include <functional>
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#include <set>
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#include "Fwmark.h"
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#include "NetlinkCommands.h"
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#include "Permission.h"
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#include "UidRanges.h"
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struct inet_diag_msg;
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struct tcp_info;
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class SockDiagTest;
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namespace android {
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namespace net {
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class SockDiag {
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public:
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static const int kBufferSize = 4096;
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// Callback function that is called once for every socket in the sockDestroy dump.
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// A return value of true means destroy the socket.
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typedef std::function<bool(uint8_t proto, const inet_diag_msg *)> DestroyFilter;
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// Callback function that is called once for every socket in the sockInfo dump.
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// 'tcp_info_length' is the length in bytes of the INET_DIAG_INFO attribute read from Netlink.
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// Knowing this length is necessary for handling struct tcp_info serialized from different
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// kernel versions.
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typedef std::function<void(Fwmark mark, const struct inet_diag_msg *, const struct tcp_info *,
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uint32_t tcp_info_length)> TcpInfoReader;
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struct DestroyRequest {
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nlmsghdr nlh;
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inet_diag_req_v2 req;
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} __attribute__((__packed__));
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SockDiag() : mSock(-1), mWriteSock(-1), mSocketsDestroyed(0) {}
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bool open();
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virtual ~SockDiag() { closeSocks(); }
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int sendDumpRequest(uint8_t proto, uint8_t family, uint32_t states);
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int sendDumpRequest(uint8_t proto, uint8_t family, const char *addrstr);
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int readDiagMsg(uint8_t proto, const DestroyFilter& callback);
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int readDiagMsgWithTcpInfo(const TcpInfoReader& callback);
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int sockDestroy(uint8_t proto, const inet_diag_msg *);
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// Destroys all sockets on the given IPv4 or IPv6 address.
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int destroySockets(const char *addrstr);
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// Destroys all sockets for the given protocol and UID.
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int destroySockets(uint8_t proto, uid_t uid, bool excludeLoopback);
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// Destroys all "live" (CONNECTED, SYN_SENT, SYN_RECV) TCP sockets for the given UID ranges.
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int destroySockets(const UidRanges& uidRanges, const std::set<uid_t>& skipUids,
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bool excludeLoopback);
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// Destroys all "live" (CONNECTED, SYN_SENT, SYN_RECV) TCP sockets that no longer have
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// the permissions required by the specified network.
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int destroySocketsLackingPermission(unsigned netId, Permission permission,
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bool excludeLoopback);
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// Dump struct tcp_info for all "live" (CONNECTED, SYN_SENT, SYN_RECV) TCP sockets.
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int getLiveTcpInfos(const TcpInfoReader& sockInfoReader);
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private:
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friend class SockDiagTest;
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int mSock;
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int mWriteSock;
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int mSocketsDestroyed;
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int sendDumpRequest(uint8_t proto, uint8_t family, uint8_t extensions, uint32_t states,
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iovec *iov, int iovcnt);
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int destroySockets(uint8_t proto, int family, const char *addrstr);
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int destroyLiveSockets(const DestroyFilter& destroy, const char *what, iovec *iov, int iovcnt);
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bool hasSocks() { return mSock != -1 && mWriteSock != -1; }
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void closeSocks() { close(mSock); close(mWriteSock); mSock = mWriteSock = -1; }
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static bool isLoopbackSocket(const inet_diag_msg *msg);
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};
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} // namespace net
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} // namespace android
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#endif // _SOCK_DIAG_H
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