ICE 域名解析耗时太长

来源：互联网发布：淘宝卖家ifashion 编辑：程序博客网时间：2024/04/19 23:22

当dns服务器设置错误，或者解析的域名是错误的域名时，ICE 域名解析耗时太长，20秒左右，发现它是使用getaddrinfo 函数进行域名解析的，并且最大循环5次；

vector<struct sockaddr_in>IceInternal::getAddresses(const string& host, int port, bool server, bool blocking){    vector<struct sockaddr_in> result;    struct sockaddr_in addr;    memset(&addr, 0, sizeof(struct sockaddr_in));#ifdef GUMSTIX    //    // Gumstix does not support calling getaddrinfo with empty host.    //    if(host.empty())    {        addr.sin_family = AF_INET;        addr.sin_port = htons(port);        if(server)        {            addr.sin_addr.s_addr = htonl(INADDR_ANY);        }        else        {            addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);        }        result.push_back(addr);        return result;    }#endif    struct addrinfo* info = 0;    int retry = 5;    struct addrinfo hints = { 0 };    hints.ai_family = PF_INET;    if(!blocking)    {        hints.ai_flags = AI_NUMERICHOST;    }    if(server)    {        //        // If host is empty, getaddrinfo will return the wildcard        // address instead of the loopack address.        //        hints.ai_flags |= AI_PASSIVE;    }    int rs = 0;    do    {        if(host.empty())        {            rs = getaddrinfo(0, "1", &hints, &info); // Get the address of the loopback interface        }        else        {            rs = getaddrinfo(host.c_str(), 0, &hints, &info);        }    }    while(info == 0 && rs == EAI_AGAIN && --retry >= 0);    // In theory, getaddrinfo should only return EAI_NONAME if AI_NUMERICHOST is specified and the host name    // is not a IP address. However on some platforms (e.g. Mac OS X 10.4.x) EAI_NODATA is also returned so    // we also check for it.#ifdef EAI_NODATA    if(!blocking && (rs == EAI_NONAME || rs == EAI_NODATA))#else    if(!blocking && rs == EAI_NONAME)#endif    {        return result; // Empty result indicates that a blocking lookup is necessary.    }    if(rs != 0)    {        DNSException ex(__FILE__, __LINE__);        ex.error = rs;        ex.host = host;        throw ex;    }    struct addrinfo* p;    for(p = info; p != NULL; p = p->ai_next)    {        assert(p->ai_family == PF_INET);        memcpy(&addr, p->ai_addr, p->ai_addrlen);        struct sockaddr_in* sin = reinterpret_cast<sockaddr_in*>(&addr);        sin->sin_port = htons(port);        bool found = false;        for(unsigned int i = 0; i < result.size(); ++i)        {            if(compareAddress(result[i], addr) == 0)            {                found = true;                break;            }        }        if(!found)        {            result.push_back(addr);        }    }    freeaddrinfo(info);    if(result.size() == 0)    {        DNSException ex(__FILE__, __LINE__);        ex.host = host;        throw ex;    }    return result;}

网上有对该函数设置超时的解决方案http://www.cppblog.com/converse/archive/2009/11/07/100349.html

http://www.cnblogs.com/cxz2009/archive/2010/11/19/1881693.html

http://bbs.chinaunix.net/thread-1433843-1-1.html

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