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   源码介绍

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linux c实现简单的https获取百度一下（"www.baidu.com"）, 忽略证书。 linux下编译： g https.cpp -lssl -lcrypto

#include <stdio.h>
#include <iostream>
#include <string.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <time.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/crypto.h>
#include <openssl/rand.h>

int https_get_request_wait_rsp(const char *ip, const char *name, int portnumber, const char *get_str, char *rsp_str, int rsp_buf_len)
{
    int sockfd = 0;
    int ret;
    char buffer[1024*1024];
    int nbytes;
    char host_addr[256];
    char request[1024];
    int send, totalsend;
    int i;
    SSL *ssl;
    SSL_CTX *ctx;
    char server_ip[16] = {0};
    struct hostent *host;
    struct in_addr addr;
    struct sockaddr_in servaddr;

    if(ip == NULL || strlen(ip) < 7)
    {
        if((host = gethostbyname(name)) == NULL )
        {
            return -1;
       }
       memcpy(&addr.s_addr,host->h_addr_list[0],sizeof(addr.s_addr));
       strcpy(server_ip,(char *)inet_ntoa(addr));
    }
    else
    {
        strcpy(server_ip, ip);
    }

    /* 客户程序开始建立 sockfd描述符 */
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) 
    {      /*建立SOCKET连接 */
        printf("socket fail..............\n");
        return -1;
                                       
    }
    
    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(portnumber);
    if(inet_pton(AF_INET, server_ip, &servaddr.sin_addr) <= 0)
    {
        printf("inet_pton error for %s\n", server_ip);
        close(sockfd);
        return -1;
    }
     /* 客户程序发起连接请求 */
    if (connect(sockfd, (struct sockaddr *) (&servaddr), sizeof(struct sockaddr)) == -1)
    {        
        printf( "Connect Error:%s\a\n", strerror(errno));
        close(sockfd);
        return -1;
    }

    /*ssl init*/
    SSL_library_init();
    SSL_load_error_strings();
    ctx = SSL_CTX_new(SSLv23_client_method());
    if(ctx == NULL)
    {
        close(sockfd);
        return -1;
    }

    ssl = SSL_new(ctx);
    if(ssl == NULL)
    {
        close(sockfd);
        return -1;
    }

    /*把socket和SSL关联*/
    ret = SSL_set_fd(ssl, sockfd);
    if(ret == 0)
    {
        close(sockfd);
        return -1;
    }

    ret = SSL_connect(ssl);
    if(ret != 1)
    {
        close(sockfd);
        return -1;
    }
    sprintf(request, "GET /%s HTTP/1.1\r\nAccept: */*\r\nAccept-Language: zh-cn\r\nUser-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)\r\nHost: %s:%d\r\nConnection: Keep-alive\r\n\r\n", get_str, server_ip, portnumber);

    printf("%s", request);

    
    send = 0;
    totalsend = 0;
    nbytes = strlen(request);
    while(totalsend < nbytes)
    {
        send = SSL_write(ssl, request   totalsend, nbytes - totalsend);
        if(send == -1)
        {
            close(sockfd);
            return -1;
        }
        totalsend  = send;
    }
    printf("44444444:%d\n", totalsend);
    i = 0;
    
    /*
    while((nbytes = SSL_read(ssl, buffer, 1)) == 1)
    {
        printf("buffer:%s\n", buffer);
        if(i < 4)
        {
            if(buffer[0] == 'r' || buffer[0] == '\n')
            {
                i  ;
                if(i>=4)
                {
                    break;
                }
            
            }
            else
            {
                i = 0;
            }
        }
    }*/
    printf("5555555\n");

    memset(rsp_str, 0, rsp_buf_len);
    ret = SSL_read(ssl, rsp_str, rsp_buf_len);
    if(ret < 0)
    {
        printf("response ret =%d ======\n", ret);
        close(sockfd);
        return -1;
    }
    printf("response ret =%d=====>\t\t[%s]\n\n", ret , rsp_str);


    /*end ssl*/
    SSL_shutdown(ssl);
    close(sockfd);
    SSL_free(ssl);
    SSL_CTX_free(ctx);
    ERR_free_strings();

    return 0;
}
int main(void)
{

    //char *hostname, *portnum, *weburl;

    char rsp_buf[40960] = {0};
    https_get_request_wait_rsp(NULL, "www.baidu.com", 443, "", rsp_buf, sizeof(rsp_buf));

    printf("=======>\n");


    return 0;
}