linux openssl 编程 Server端

标签：linux   openssl   编程   api   

OpenSSL 是一个强大的安全套接字层密码库，囊括主要的密码算法、常用的密钥和证书封装管理功能及SSL协议，并提供丰富的应用程序供测试或其它目的使用。

直接进行编程步骤：

1.首先确保电脑端拥有openssl库，我这采用的方式是直接使用源码，然后进行编译，编译方式可以参考以下链接地址：

http://www.wangyan.org/blog/install-openssl-from-source.html

2.Server端源码：

openssl_server.c

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

#define	MAXBUF	1024

int main(int argc,char **argv)
{
	struct sockaddr_in	my_addr,their_addr;
	unsigned int	myport;
	char		buf[MAXBUF + 1] = { 0 };
	SSL_CTX		*ctx;
	int 		sockfd,new_fd;
	socklen_t	len;
	
	if (argc != 4)
	{
		printf("Usage:%s [bind port] [CERT_PATH] [PRI_KEY_PATH]\n",argv[0]);
		return -1;
	}
	
	if (argv[1])
		myport = atoi(argv[1]);
	
	/*初始化openssl库*/
	SSL_library_init();
	OpenSSL_add_all_algorithms();
	SSL_load_error_strings();
	ctx = SSL_CTX_new(SSLv23_server_method());
	if (ctx == NULL)
	{
		ERR_print_errors_fp(stdout);
		exit(-1);
	}

	/*加载服务器证书*/
	if (SSL_CTX_use_certificate_file(ctx, argv[2], SSL_FILETYPE_PEM) <= 0)
	{
		ERR_print_errors_fp(stdout);
		exit(-1);
	}

	/*加载服务器私钥*/
	if (SSL_CTX_use_PrivateKey_file(ctx,argv[3],SSL_FILETYPE_PEM) <= 0)
	{
		ERR_print_errors_fp(stdout);
		exit(-1);
	}

	if (!SSL_CTX_check_private_key(ctx)) 
	{
        	ERR_print_errors_fp(stdout);
        	exit(-1);
    	}

	if ((sockfd = socket(PF_INET,SOCK_STREAM,0)) == -1)
	{
		perror("socket");
		exit(-1);
	}
	else
	{
		printf("socket created\n");
	}

	bzero(&my_addr,sizeof(my_addr));
	my_addr.sin_family = PF_INET;
	my_addr.sin_port = htons(myport);
	my_addr.sin_addr.s_addr = INADDR_ANY;

	if (bind(sockfd,(struct sockaddr*)&my_addr,sizeof(struct sockaddr)) == -1)
	{
		perror("bind");
		exit(-1);
	}
	else
		printf("binded\n");

	if (listen(sockfd,5) == -1)
	{
		perror("listen");
		exit(-1);
	}
	else
		printf("begin to listen\n");

	while(1)
	{
		SSL *ssl;
		len = sizeof(struct sockaddr);
		if ((new_fd = accept(sockfd,(struct sockaddr*)&their_addr,&len)) == -1)
		{
			perror("accept");
			exit(-1);
		}
		else
			printf("server:got connection from %s,port %d,sockfd %d\n",inet_ntoa(their_addr.sin_addr),ntohs(their_addr.sin_port),new_fd);

        	ssl = SSL_new(ctx);
        	SSL_set_fd(ssl, new_fd);
        	if (SSL_accept(ssl) == -1) {
            		perror("accept");
            		close(new_fd);
            		break;
        	}

        	bzero(buf, MAXBUF + 1);
        	strcpy(buf, "server->client");
        	len = SSL_write(ssl, buf, strlen(buf));
		if (len <= 0) {
            		printf("message '%s' send error! error code:'%d',error info:'%s'\n",
                 		buf, errno, strerror(errno));
            		goto finish;
        	} else
            		printf("message '%s' send success!message total size:'%d'\n",
                   	buf, len);

        		bzero(buf, MAXBUF + 1);
        		len = SSL_read(ssl, buf, MAXBUF);
        		if (len > 0)
            			printf("recv message:'%s' ok!message total size:'%d'\n",
                   			buf, len);
        		else
            			printf("recv message error.error code:'%d',error info:'%s'\n",
                 			errno, strerror(errno));
      finish:
		SSL_shutdown(ssl);
        	SSL_free(ssl);
        	close(new_fd);
	}
    close(sockfd);
    SSL_CTX_free(ctx);
    return 0;
}

gcc -o ssl_server ssl_server.c -Wall -g -lssl

gcc -o openssl_server openssl_server.c -Wall -lssl -lcrypto -L./openssl-1.0.2d/ -Wl,-rpath=./openssl-1.0.2d

4.证书申请

私钥

openssl genrsa -out privkey.pem 1024

openssl req -new -x509 -key privkey.pem -out CAcert.pem -days 1095

Usage:openssl_server [bind port] [CERT_PATH] [PRI_KEY_PATH]

linux openssl 编程 Server端

标签：linux   openssl   编程   api   

原文地址：http://blog.csdn.net/pingd/article/details/47805349