Question

我找到了以下代码片段，并对json数据发布到re_url进行了一些更改。但它显示错误连接错误...服务器在8888端口上侦听json数据。

#include <stdio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/bio.h>

#define APIKEY "YOUR_API_KEY"
#define HOST "https://YOUR_WEB_SERVER_URI"
#define PORT "8888"
char *s = "somejson";
int main() {

//
//  Initialize the variables
//
BIO* bio;
SSL* ssl;
SSL_CTX* ctx;

//
//   Registers the SSL/TLS ciphers and digests.
//
//   Basically start the security layer.
//
SSL_library_init();

//
//  Creates a new SSL_CTX object as a framework to establish TLS/SSL
//  or DTLS enabled connections
//
ctx = SSL_CTX_new(SSLv23_client_method());

//
//  -> Error check
//
if (ctx == NULL)
{
    printf("Ctx is null\n");
}

//
//   Creates a new BIO chain consisting of an SSL BIO
//
bio = BIO_new_ssl_connect(ctx);

//
//  Use the variable from the beginning of the file to create a 
//  string that contains the URL to the site that you want to connect
//  to while also specifying the port.
//
BIO_set_conn_hostname(bio, HOST ":" PORT);

//
//   Attempts to connect the supplied BIO
//
if(BIO_do_connect(bio) <= 0)
{
    printf("Failed connection\n");
    return 1;
}
else
{
    printf("Connected\n");
}

//
//  The bare minimum to make a HTTP request.
//
char* write_buf = "POST / HTTP/1.1\r\n"
                  "Host: " HOST "\r\n"
                  "Authorization: Basic " APIKEY "\r\n"
                  "Connection: close\r\n"
                  "\r\n";

//
//   Attempts to write len bytes from buf to BIO
//
if(BIO_write(bio, write_buf, strlen(write_buf)) <= 0)
{
    //
    //  Handle failed writes here
    //
    if(!BIO_should_retry(bio))
    {
        // Not worth implementing, but worth knowing.
    }

    //
    //  -> Let us know about the failed writes
    //
    printf("Failed write\n");
}

//
//  Variables used to read the response from the server
//
int size;
char buf[1024];

//
//  Read the response message
//
for(;;)
{
    //
    //  Get chunks of the response 1023 at the time.
    //
    size = BIO_read(bio, buf, 1023);

    //
    //  If no more data, then exit the loop
    //
    if(size <= 0)
    {
        break;
    }

    //
    //  Terminate the string with a 0, to let know C when the string 
    //  ends.
    //
    buf[size] = 0;

    //
    //  ->  Print out the response
    //
    printf("%s", buf);
}

//
//  Clean after ourselves
//
BIO_free_all(bio);
SSL_CTX_free(ctx);

return 0;
}

上面的代码将详细说明如何与远程服务器建立TLS连接。

重要说明：此代码不检查公钥是否由有效授权机构签名。意思是我不使用根证书进行验证。不要忘记执行此检查，否则您不知道您是否正在连接正确的网站

当涉及到请求本身时。它只不过是手工编写HTTP请求。

您还可以在此链接下找到有关如何在系统中安装openSSL以及如何编译代码以使其使用安全库的说明。

Answer 1

来自BIO_set_conn_hostname：

BIO_set_conn_hostname（）使用字符串名称来设置主机名。该 hostname可以是IP地址。主机名还可以包括端口以hostname：port的形式。使用表格也是可以接受的＆＃34;主机名/任何/其他/路径＆＃34;或＆＃34;主机名：port / any / other / path＆＃34;。

您没有提供有效的主机名：

#define HOST "https://YOUR_WEB_SERVER_URI"
...
//  Use the variable from the beginning of the file to create a 
//  string that contains the URL to the site that you want to connect
//  to while also specifying the port.
BIO_set_conn_hostname(bio, HOST ":" PORT);

注释正确引用了一个URL，但您提供的URI很可能是错误的。

如果用真实主机名替换YOUR_WEB...，它仍然是URI而不是主机名。尝试删除"https://"部分，仅提供主机名。

在c中通过https发布json数据

1 个答案: