client_program_with_ssl

#include "header.h"
//#include "osal.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/x509.h>


#define SERVER_IP "127.0.0.1"
#define PORT 7788
#define MAXBUF 1024

#define CAFILE   "./ca.pem"



void ShowCerts(SSL * ssl)//�õ��������˵�֤����Ϣ������ӡ����(��ѡ�������DZ�����)
{
    X509 *cert;
    char *line;

    if(X509_V_OK != SSL_get_verify_result(ssl))//��֤����������Ҫ��Ӧ����CA֤�飬��������֤���Ϸ������������Ӳ��ܼ������У�ֻ����Ҫ�ͻ������߾���
    {
       printf("warning!!!!!!\n Failed verify the server certificate!\n");
    }

    cert = SSL_get_peer_certificate(ssl);//��ssl�ṹ����ȡ���Է���֤��(ע:��ʱ֤���Ѿ��õ����Ѿ�������֤)
    if (cert != NULL)
    {
        line = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0);
        printf("certificate: %s\n", line);
        free(line);
        line = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0);
        printf("issuer: %s\n", line);
        free(line);
        X509_free(cert);
    }
    else
    {
        printf("No certificate information\n");
    }
}

int connect2server()
{
    int iret,sockfd,len;
    SSL_CTX *ctx;
    SSL *ssl;
    char ssl_buf[MAXBUF];
    struct sockaddr_in server;
    char connected[]="connected.";
    char recv[]="Recv";
    char send[]="Send";

    SSL_library_init();
    OpenSSL_add_all_algorithms();
    SSL_load_error_strings();
    ctx = SSL_CTX_new(SSLv23_client_method());
    if(ctx == NULL)
    {
        ERR_print_errors_fp(stdout);
        exit(1);
    }

    if((iret = SSL_CTX_load_verify_locations(ctx,CAFILE,NULL)) == 0)
    {
        printf("SSL_CTX_load_verify_locations err: %d\n", iret);
    }

    if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
    {
        perror("Socket");
        exit(errno);
    }

    bzero(&server, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(PORT);
    if(inet_aton(SERVER_IP, (struct in_addr *)&server.sin_addr.s_addr) == 0)
    {
        perror(SERVER_IP);
        exit(errno);
    }

    if((iret = connect(sockfd, (struct sockaddr *)&server, sizeof(server))) != 0)
    {
        perror("Connect");
        exit(errno);
    }


    printf("Connected\n");
    ssl = SSL_new(ctx);
    SSL_set_fd(ssl, sockfd);

    printf("start SSL_connect.\n");
    if(SSL_connect(ssl) == -1)
    {
        ERR_print_errors_fp(stderr);
    }
    else
    {
        ShowCerts(ssl);
//      printf("SSL_connect.\n");
        printf("Connected with %s encryption\n", SSL_get_cipher(ssl));//��ӡ����֧�ֵļ����㷨��Ϣ
    }


    bzero(ssl_buf, MAXBUF);
    strcpy(ssl_buf, "Hello Server: This is ssl client!\n");

    printf("Send\n");
    len = SSL_write(ssl, ssl_buf, strlen(ssl_buf));
    if (len <= 0)
    {
        printf ("SSL_write error, errno=%d(%s)\n",errno, strerror(errno));
        goto error;
    }
    else
    {
        printf("SSL_write %d bytes: %s\n", len, ssl_buf);
    }

    printf("Receive\n");
    bzero(ssl_buf, MAXBUF);

    while(1)
    {
        len = SSL_read(ssl, ssl_buf, MAXBUF);
        if(len < 0)
        {
            printf("SSL_read error, errno=%d(%s)\n", errno, strerror(errno));
            ERR_print_errors_fp(stdout);
            goto error;
        }

        if(0 == len)
         continue;

        break;
    }

    printf("SSL_read %d bytes: %s\n",len, ssl_buf);
    usleep(100*2000);

   error:
     SSL_shutdown(ssl);
     SSL_free(ssl);
     close(sockfd);
     SSL_CTX_free(ctx);

  return 0;
}



int SslClient()
{
   connect2server();
    usleep(100*1000);
    return 0;
}


int main()
{
    SslClient();
    return 0;
}