#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?

#define?MAXBUF?1024

void?ShowCerts（SSL?*?ssl）
{
????X509?*cert;
????char?*line;
????cert?=?SSL_get_peer_certificate（ssl）;
????if?（cert?!=?NULL）?{
????????printf（“數字證書信息:\n“）;
????????line?=?X509_NAME_oneline（X509_get_subject_name（cert）?0?0）;
????????printf（“證書:?%s\n“?line）;
????????free（line）;
????????line?=?X509_NAME_oneline（X509_get_issuer_name（cert）?0?0）;
????????printf（“頒發者:?%s\n“?line）;
????????free（line）;
????????X509_free（cert）;
????}?else?{
????????printf（“無證書信息！\n“）;
????}
}

int?main（int?argc?char?**argv）
{
????int?sockfd?len;
????struct?sockaddr_in?dest;
????char?buffer[MAXBUF?+?1];
????SSL_CTX?*ctx;
????SSL?*ssl;

????if?（argc?!=?3）?{
????????printf（“參數格式錯誤！正確用法如下：\n\t\t%s?IP地址?端口\n\t比如:\t%s?127.0.0.1?80\n此程序用來從某個“
????????????????“IP?地址的服務器某個端口接收最多?%d?個字節的消息.\n“?argv[0]?argv[0]?MAXBUF）;
????????exit（0）;
????}

????/*SSL初始化*/
????SSL_library_init（）;
????OpenSSL_add_all_algorithms（）;
????SSL_load_error_strings（）;
????ctx?=?SSL_CTX_new（SSLv3_client_method（））;

????if?（（sockfd?=?socket（AF_INET?SOCK_STREAM?0））?????????perror（“Socket“）;
????????exit（errno）;
????}

????bzero（&dest?sizeof（dest））;
????dest.sin_family?=?AF_INET;
????dest.sin_port?=?htons（atoi（argv[2]））;
????if?（inet_aton（argv[1]?（struct?in_addr?*）?&dest.sin_addr.s_addr）?==?0）?{
????????perror（argv[1]）;
????????exit（errno）;
????}

????if?（connect（sockfd?（struct?sockaddr?*）?&dest?sizeof（dest））?!=?0）?{
????????perror（“Connect?“）;
????????exit（errno）;
????}
????printf（“connectd?server?successly\n“）;

????ssl?=?SSL_new（ctx）;
????SSL_set_fd（ssl?sockfd）;
????if?（SSL_connect（ssl）?==?-1）?{
????????ERR_print_errors_fp（stderr）;
????}?else?{
????????printf（“Connected?with?%s?encryption\n“?SSL_get_cipher（ssl））;
????????ShowCerts（ssl）;
????}

????bzero（buffer?MAXBUF?+?1）;
????len?=?SSL_read（ssl?buffer?MAXBUF）;
????if?（len?>?0）?{
????????printf（“接收消息成功:‘%s‘，共%d個字節的數據\n“?buffer?len）;
????}?else?{
????????printf（“消息接收失敗！錯誤代碼是%d，錯誤信息是‘%s‘\n“?errno?strerror（errno））;
????????goto?finish;
????}
????bzero（buffer?MAXBUF?+?1）;
????strcpy（buffer?“from?client->server“）;

????len?=?SSL_write（ssl?buffer?strlen（buffer））;
????if?（len?????????printf（“消息‘%s‘發送失敗！錯誤代碼是%d，錯誤信息是‘%s‘\n“?buffer?errno?strerror（errno））;
????}?else?{
????????printf（“消息‘%s‘發送成功，共發送了%d個字節！\n“?buffer?len）;
????}

finish:
????SSL_shutdown（ssl）;
????SSL_free（ssl）;
????close（sockfd）;
????SSL_CTX_free（ctx）;
????return?0;
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????2794??2017-12-01?16:34??client.c
?????文件????????4671??2017-12-01?16:34??client1.c
?????文件????????3140??2017-12-01?16:32??des3.c
?????文件????????4000??2017-12-01?16:32??rsa.c
?????文件????????3603??2017-12-01?16:33??server.c
?????文件????????4594??2017-12-01?16:33??server1.c