如何使libcurl支持https

extern "C" __declspec(dllexport) int  __cdecl https_post(const char* strUrl,char *szPost,const char * pCaPath)

{

    CURL *curl

    CURLcode res

    res_buf = ""

    curl = curl_easy_init()  //初始化

    if(curl&&strUrl)

    {

        curl_easy_setopt(curl,CURLOPT_URL,strUrl)             //设置url地址

        if(szPost)

        {

            curl_easy_setopt(curl,CURLOPT_POSTFIELDS,szPost)   //设置post参数

        }

 

        curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,write_func)  //设置回调函数

        curl_easy_setopt(curl,CURLOPT_WRITEDATA,&res_buf)        //设置写数据

         

        if(NULL == pCaPath)

        {

            curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false)//设定为不验证证书和HOST 

            curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, false) 

        }

        else 

        { 

            curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, true) 

            curl_easy_setopt(curl, CURLOPT_CAINFO, pCaPath) 

        }

 

        res = curl_easy_perform(curl)                           //执行

        if(res == CURLE_OK)

        {

            if(m_json)

            {

                delete m_json

                m_json = NULL

            }

            m_json = new char[strlen(res_buf.c_str())+1]

            strcpy(m_json,Utf8toAnsi(res_buf.c_str()))

            curl_easy_cleanup(curl)

            return 1

        }

        return -1

    }

    return -1

}

需要https站点开启了验证客户端证书，而且客户端证书是https需要的。将客户证书放在bundle里，之后用libcurl的setopt设置cert的路径，而且还可以设置服务器验证的一些属性，https证书签发CA沃通wosign网站有相关资料。

Elasticsearch可以通过http报文和json语句来进行增删查改，可以通过libcurl构造语句，去发送到es集群进行 *** 作。参考

https://blog.csdn.net/xsdxs/article/details/72849796

https://stackoverflow.com/questions/25887453/how-to-use-libcurl-in-c-to-send-post-to-elasticsearch

实现一个简便的esclient（）函数，方便读写

运行结果：

图1是查询单条语句的结果

图2是批量查询的结果

图3是以上程序运行前的图

图4是以上程序运行后的图

附录：以上源码

```

    #include

    #include

    #include

    #include

    #include

    using namespace std

    size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream)

    {

        strncat((char *)stream, (char *)ptr, size*nmemb)

        return size * nmemb

    }

    int esclient(const string &_http, const string &_json, const string &_command)

    {

            CURL *curl

            CURLcode res

            struct curl_slist* headers = NULL        

            curl = curl_easy_init()

            curl_easy_setopt(curl, CURLOPT_VERBOSE, 1)

            curl_easy_setopt(curl, CURLOPT_URL, _http.c_str())

            headers=curl_slist_append(headers, "Content-Type:application/json")

            curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers)

            char out[40960]={0}        

            curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data)

            curl_easy_setopt(curl, CURLOPT_WRITEDATA, &out)

            if(_command=="delete")

            {

                    curl_easy_setopt(curl,  CURLOPT_CUSTOMREQUEST, "DELETE")

            }

            else if(_command=="get")

            {                

                    curl_easy_setopt(curl,  CURLOPT_CUSTOMREQUEST, "GET")                

            }

            else

            {

                    curl_easy_setopt(curl,  CURLOPT_CUSTOMREQUEST, "POST")

            }

            if(!_json.empty())

            {

                    curl_easy_setopt(curl,CURLOPT_POSTFIELDS,_json.c_str())

                    curl_easy_setopt(curl,CURLOPT_POSTFIELDSIZE,_json.length())

            }

            res = curl_easy_perform(curl)

           printf("%s\n",out)

            curl_easy_cleanup(curl)

            return res

    }

    int main(void)

    {

            esclient("http://172.31.100.114:9200/customer/external/1","","get")        //查询单条数据

            esclient("http://172.31.100.114:9200/bank/_search","","search")        //批量查询数据，但是只返回10条，如需其他要求，加json语句

            esclient("http://172.31.100.114:9200/customer/external/3/"," { \"name\": \"hhh\" }","add")                //增加一条数据

            esclient("http://172.31.100.114:9200/customer/external/2/_updata/"," {\"doc\": { \"name\": \"eee\" }}","updata")        //更新某条数据

            esclient("http://172.31.100.114:9200/ccc","","delete")                //删除索引

            esclient("http://172.31.100.114:9200/customer/external/_delete_by_query"," {\"query\":{ \"match\":{\"name\": \"hhh\" }}}","")        //匹配删除数据

    }

```

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