linux openssl 编程 Client端

相关配置等请参看上一篇关于server端文章：http://blog.youkuaiyun.com/pingd/article/details/47805349

1.Client端源码：

openssl_client.c

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <resolv.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <openssl/ssl.h>
#include <openssl/err.h>

#define MAXBUF 1024

void ShowCerts(SSL * ssl)
{
    X509 *cert;
    char *line;

    cert = SSL_get_peer_certificate(ssl);
    if (cert != NULL) {
        printf("Digital cert info:\n");
        line = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0);
        printf("Cert: %s\n", line);
        free(line);
        line = X509_NAME_oneline(X509_get_issuer_name(cert), 0,