openssl 实现https 网页访问

最新推荐文章于 2025-06-05 05:07:19 发布

xiongtiancheng

最新推荐文章于 2025-06-05 05:07:19 发布

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分类专栏： http 文章标签： openssl https https通信

本文链接：https://blog.youkuaiyun.com/xiongtiancheng/article/details/86564596

本文提供了一个使用openssl库实现HTTPS网页访问的示例，详细介绍了通信流程，包括初始化、发送HTTP请求、获取状态码和内容，以及资源清理。主要涉及的函数有https_init、https_uninit等。

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下面是一个用openssl 实现获取https 网页内容的demo，整个流程比较简单，主要封装的API如下

static int https_init(https_context_t *context,const char* url);
static int https_uninit(https_context_t *context);
static int https_read(https_context_t *context,void* buff,int len);
static int https_write(https_context_t *context,const void* buff,int len);
static int https_get_status_code(https_context_t *context);
static int https_read_content(https_context_t *context,char *resp_contet,int max_len);

通信流程：

1、初始化，解析url资源，创建socket 连接，绑定ssl

2、发送http 请求

3、获取请求返回的状态码

4、获取请求返回的数据

5、销毁动态申请的内存资源

为了方便学习，我就把整个代码贴在下面


#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <openssl/ssl.h>
#include <openssl/bio.h>

#define HTTP_REQ_LENGTH          512
#define HTTP_RESP_LENGTH         20480

typedef struct
{
    int sock_fd;
    SSL_CTX *ssl_ct;
    SSL *ssl;

    //url 解析出来的信息
    char *host;
    char *path;
    int port;
} https_context_t;

static int https_init(https_context_t *context,const char* url);
static int https_uninit(https_context_t *context);
static int https_read(https_context_t *context,void* buff,int len);
static int https_write(https_context_t *context,const void* buff,int len);
static int https_get_status_code(https_context_t *context);
static int https_read_content(https_context_t *context,char *resp_contet,int max_len);

// http 请求头信息
static char https_header[] =
    "GET %s HTTP/1.1\r\n"
    "Host: %s:%d\r\n"
    "Connection: Close\r\n"
    "Accept: */*\r\n"
    "\r\n";

static char http_req_content[HTTP_REQ_LENGTH] = {0};
static char https_resp_content[HTTP_RESP_LENGTH+1] = {0};

static int create_request_socket(const char* host,const int port)
{