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Commit 264e8e2d authored by Treehugger Robot's avatar Treehugger Robot Committed by Automerger Merge Worker
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Merge "Fix refcounting on thread creation failure path for... 

Merge "Fix refcounting on thread creation failure path for android_res_nsend()" am: b3b845f5 am: 97980502 am: aea4412e

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/1470463

Change-Id: I6d217d61c5afcc30f7b05bec5f60486fe6a8728c
parents 5a439570 aea4412e

DnsProxyListener.cpp

+21 −42
Original line number Diff line number Diff line
@@ -84,25 +84,6 @@ void logArguments(int argc, char** argv) { 
    }

}



template<typename T>

void tryThreadOrError(SocketClient* cli, T* handler) {

    cli->incRef();



    const int rval = netdutils::threadLaunch(handler);

    if (rval == 0) {

        // SocketClient decRef() happens in the handler's run() method.

        return;

    }



    char* msg = nullptr;

    asprintf(&msg, "%s (%d)", strerror(-rval), -rval);

    cli->sendMsg(ResponseCode::OperationFailed, msg, false);

    free(msg);



    delete handler;

    cli->decRef();

}



bool checkAndClearUseLocalNameserversFlag(unsigned* netid) {

    if (netid == nullptr || ((*netid) & NETID_USE_LOCAL_NAMESERVERS) == 0) {

        return false;
@@ -563,10 +544,23 @@ DnsProxyListener::DnsProxyListener() : FrameworkListener(SOCKET_NAME) { 
    registerCmd(new GetDnsNetIdCommand());

}



void DnsProxyListener::Handler::spawn() {

    const int rval = netdutils::threadLaunch(this);

    if (rval == 0) {

        return;

    }



    char* msg = nullptr;

    asprintf(&msg, "%s (%d)", strerror(-rval), -rval);

    mClient->sendMsg(ResponseCode::OperationFailed, msg, false);

    free(msg);

    delete this;

}



DnsProxyListener::GetAddrInfoHandler::GetAddrInfoHandler(SocketClient* c, char* host, char* service,

                                                         addrinfo* hints,

                                                         const android_net_context& netcontext)

    : mClient(c), mHost(host), mService(service), mHints(hints), mNetContext(netcontext) {}

    : Handler(c), mHost(host), mService(service), mHints(hints), mNetContext(netcontext) {}



DnsProxyListener::GetAddrInfoHandler::~GetAddrInfoHandler() {

    free(mHost);
@@ -763,7 +757,6 @@ void DnsProxyListener::GetAddrInfoHandler::run() { 
    reportDnsEvent(INetdEventListener::EVENT_GETADDRINFO, mNetContext, latencyUs, rv, event, mHost,

                   ip_addrs, total_ip_addr_count);

    freeaddrinfo(result);

    mClient->decRef();

}



std::string DnsProxyListener::GetAddrInfoHandler::threadName() {
@@ -841,9 +834,7 @@ int DnsProxyListener::GetAddrInfoCmd::runCommand(SocketClient *cli, 
        hints->ai_protocol = ai_protocol;

    }



    DnsProxyListener::GetAddrInfoHandler* handler =

            new DnsProxyListener::GetAddrInfoHandler(cli, name, service, hints, netcontext);

    tryThreadOrError(cli, handler);

    (new GetAddrInfoHandler(cli, name, service, hints, netcontext))->spawn();

    return 0;

}
@@ -888,19 +879,13 @@ int DnsProxyListener::ResNSendCommand::runCommand(SocketClient* cli, int argc, c 
        netcontext.flags |= NET_CONTEXT_FLAG_USE_LOCAL_NAMESERVERS;

    }



    DnsProxyListener::ResNSendHandler* handler =

            new DnsProxyListener::ResNSendHandler(cli, argv[3], flags, netcontext);

    tryThreadOrError(cli, handler);

    (new ResNSendHandler(cli, argv[3], flags, netcontext))->spawn();

    return 0;

}



DnsProxyListener::ResNSendHandler::ResNSendHandler(SocketClient* c, std::string msg, uint32_t flags,

                                                   const android_net_context& netcontext)

    : mClient(c), mMsg(std::move(msg)), mFlags(flags), mNetContext(netcontext) {}



DnsProxyListener::ResNSendHandler::~ResNSendHandler() {

    mClient->decRef();

}

    : Handler(c), mMsg(std::move(msg)), mFlags(flags), mNetContext(netcontext) {}



void DnsProxyListener::ResNSendHandler::run() {

    LOG(DEBUG) << "ResNSendHandler::run: " << mFlags << " / {" << mNetContext.app_netid << " "
@@ -1090,15 +1075,13 @@ int DnsProxyListener::GetHostByNameCmd::runCommand(SocketClient *cli, 
        netcontext.flags |= NET_CONTEXT_FLAG_USE_LOCAL_NAMESERVERS;

    }



    DnsProxyListener::GetHostByNameHandler* handler =

            new DnsProxyListener::GetHostByNameHandler(cli, name, af, netcontext);

    tryThreadOrError(cli, handler);

    (new GetHostByNameHandler(cli, name, af, netcontext))->spawn();

    return 0;

}



DnsProxyListener::GetHostByNameHandler::GetHostByNameHandler(SocketClient* c, char* name, int af,

                                                             const android_net_context& netcontext)

    : mClient(c), mName(name), mAf(af), mNetContext(netcontext) {}

    : Handler(c), mName(name), mAf(af), mNetContext(netcontext) {}



DnsProxyListener::GetHostByNameHandler::~GetHostByNameHandler() {

    free(mName);
@@ -1190,7 +1173,6 @@ void DnsProxyListener::GetHostByNameHandler::run() { 
    const int total_ip_addr_count = extractGetHostByNameAnswers(hp, &ip_addrs);

    reportDnsEvent(INetdEventListener::EVENT_GETHOSTBYNAME, mNetContext, latencyUs, rv, event,

                   mName, ip_addrs, total_ip_addr_count);

    mClient->decRef();

}



std::string DnsProxyListener::GetHostByNameHandler::threadName() {
@@ -1242,16 +1224,14 @@ int DnsProxyListener::GetHostByAddrCmd::runCommand(SocketClient *cli, 
        netcontext.flags |= NET_CONTEXT_FLAG_USE_LOCAL_NAMESERVERS;

    }



    DnsProxyListener::GetHostByAddrHandler* handler = new DnsProxyListener::GetHostByAddrHandler(

            cli, addr, addrLen, addrFamily, netcontext);

    tryThreadOrError(cli, handler);

    (new GetHostByAddrHandler(cli, addr, addrLen, addrFamily, netcontext))->spawn();

    return 0;

}



DnsProxyListener::GetHostByAddrHandler::GetHostByAddrHandler(SocketClient* c, void* address,

                                                             int addressLen, int addressFamily,

                                                             const android_net_context& netcontext)

    : mClient(c),

    : Handler(c),

      mAddress(address),

      mAddressLen(addressLen),

      mAddressFamily(addressFamily),
@@ -1351,7 +1331,6 @@ void DnsProxyListener::GetHostByAddrHandler::run() { 


    reportDnsEvent(INetdEventListener::EVENT_GETHOSTBYADDR, mNetContext, latencyUs, rv, event,

                   (hp && hp->h_name) ? hp->h_name : "null", {}, 0);

    mClient->decRef();

}



std::string DnsProxyListener::GetHostByAddrHandler::threadName() {

DnsProxyListener.h

+33 −21
Original line number Diff line number Diff line
@@ -38,6 +38,23 @@ class DnsProxyListener : public FrameworkListener { 
    static constexpr const char* SOCKET_NAME = "dnsproxyd";



  private:

    class Handler {

      public:

        Handler(SocketClient* c) : mClient(c) { mClient->incRef(); }

        virtual ~Handler() { mClient->decRef(); }

        void operator=(const Handler&) = delete;



        // Attept to spawn the worker thread, or return an error to the client.

        // The Handler instance will self-delete in either case.

        void spawn();



        virtual void run() = 0;

        virtual std::string threadName() = 0;



        SocketClient* mClient;  // ref-counted

    };



    /* ------ getaddrinfo ------*/

    class GetAddrInfoCmd : public FrameworkCommand {

      public:

        GetAddrInfoCmd();
@@ -45,21 +62,19 @@ class DnsProxyListener : public FrameworkListener { 
        int runCommand(SocketClient* c, int argc, char** argv) override;

    };



    /* ------ getaddrinfo ------*/

    class GetAddrInfoHandler {

    class GetAddrInfoHandler : public Handler {

      public:

        // Note: All of host, service, and hints may be NULL

        GetAddrInfoHandler(SocketClient* c, char* host, char* service, addrinfo* hints,

                           const android_net_context& netcontext);

        ~GetAddrInfoHandler();

        ~GetAddrInfoHandler() override;



        void run();

        std::string threadName();

        void run() override;

        std::string threadName() override;



      private:

        void doDns64Synthesis(int32_t* rv, addrinfo** res, NetworkDnsEventReported* event);



        SocketClient* mClient;  // ref counted

        char* mHost;            // owned. TODO: convert to std::string.

        char* mService;         // owned. TODO: convert to std::string.

        addrinfo* mHints;       // owned
@@ -74,20 +89,19 @@ class DnsProxyListener : public FrameworkListener { 
        int runCommand(SocketClient* c, int argc, char** argv) override;

    };



    class GetHostByNameHandler {

    class GetHostByNameHandler : public Handler {

      public:

        GetHostByNameHandler(SocketClient* c, char* name, int af,

                             const android_net_context& netcontext);

        ~GetHostByNameHandler();

        ~GetHostByNameHandler() override;



        void run();

        std::string threadName();

        void run() override;

        std::string threadName() override;



      private:

        void doDns64Synthesis(int32_t* rv, hostent* hbuf, char* buf, size_t buflen, hostent** hpp,

                              NetworkDnsEventReported* event);



        SocketClient* mClient;  // ref counted

        char* mName;            // owned. TODO: convert to std::string.

        int mAf;

        android_net_context mNetContext;
@@ -101,20 +115,19 @@ class DnsProxyListener : public FrameworkListener { 
        int runCommand(SocketClient* c, int argc, char** argv) override;

    };



    class GetHostByAddrHandler {

    class GetHostByAddrHandler : public Handler {

      public:

        GetHostByAddrHandler(SocketClient* c, void* address, int addressLen, int addressFamily,

                             const android_net_context& netcontext);

        ~GetHostByAddrHandler();

        ~GetHostByAddrHandler() override;



        void run();

        std::string threadName();

        void run() override;

        std::string threadName() override;



      private:

        void doDns64ReverseLookup(hostent* hbuf, char* buf, size_t buflen, hostent** hpp,

                                  NetworkDnsEventReported* event);



        SocketClient* mClient;  // ref counted

        void* mAddress;         // address to lookup; owned

        int mAddressLen;        // length of address to look up

        int mAddressFamily;     // address family
@@ -129,17 +142,16 @@ class DnsProxyListener : public FrameworkListener { 
        int runCommand(SocketClient* c, int argc, char** argv) override;

    };



    class ResNSendHandler {

    class ResNSendHandler : public Handler {

      public:

        ResNSendHandler(SocketClient* c, std::string msg, uint32_t flags,

                        const android_net_context& netcontext);

        ~ResNSendHandler();

        ~ResNSendHandler() override = default;



        void run();

        std::string threadName();

        void run() override;

        std::string threadName() override;



      private:

        SocketClient* mClient;  // ref counted

        std::string mMsg;

        uint32_t mFlags;

        android_net_context mNetContext;