ssl 编程服务器和客户端完整demo c++版，编译环境：cent os 64, g++
安装openssl：
yum search opensll #查找可用的openssl开发包
yum install opensll-devel.x86_64 #从查找结果中选择安装 devel 版本
生成ca文件和key文件，供服务器使用
openssl genrsa -out privkey.pem 2048
openssl req -new -x509 -key privkey.pem -out cacert.pem -days 1095
服务器代码：
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
const int s_myport = 8081;
int main(int argc, char **argv)
{
int sockfd, new_fd;
socklen_t len;
struct sockaddr_in my_addr, their_addr;
char buf[MAXBUF + 1];
SSL_CTX *ctx;
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);
printf("---1\n");
exit(1);
}
if (SSL_CTX_use_certificate_file(ctx, argv[1], SSL_FILETYPE_PEM) <= 0)
{
ERR_print_errors_fp(stdout);
printf("---2:{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s\n", argv[1]);
exit(1);
}
if (SSL_CTX_use_PrivateKey_file(ctx, argv[2], SSL_FILETYPE_PEM) <= 0)
{
ERR_print_errors_fp(stdout);
printf("---3:{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s\n", argv[2]);
exit(1);
}
if (!SSL_CTX_check_private_key(ctx))
{
printf("---4\n");
ERR_print_errors_fp(stdout);
exit(1);
}
if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1)
{
printf("---5\n");
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(s_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");
}
unsigned int lisnum = 1;
if (listen(sockfd, lisnum) == -1)
{
perror("listen");
exit(1);
}
else
{
printf("begin listen\n");
}
while (1)
{
SSL *ssl;
len = sizeof(struct sockaddr);
if ((new_fd = accept(sockfd, (struct sockaddr *) &their_addr, &len)) == -1)
{
perror("accept");
exit(errno);
}
else
{
printf("server: got connection from {b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s, port {b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}d, socket {b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}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, "hello, this is server");
len = SSL_write(ssl, buf, strlen(buf));
if (len <= 0)
{
printf("{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s,{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}d,{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s\n",buf, errno, strerror(errno));
goto finish;
}
else
{
//printf("{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s, {b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}d\n", buf, len);
}
bzero(buf, MAXBUF + 1);
len = SSL_read(ssl, buf, MAXBUF);
if (len > 0)
{
printf("{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s, {b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}d\n", buf, len);
}
else
{
printf("{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}d,{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s'\n", errno, strerror(errno));
}
finish:
SSL_shutdown(ssl);
SSL_free(ssl);
close(new_fd);
}
close(sockfd);
SSL_CTX_free(ctx);
return 0;
}
客户端代码：
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("show:\n");
line = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0);
printf("one: {b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s\n", line);
free(line);
line = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0);
printf("two {b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s\n", line);
free(line);
char commonName [512] = {0};
X509_NAME * name = NULL;
name = X509_get_subject_name(cert);
X509_NAME_get_text_by_NID(name, NID_commonName, commonName, 512);
printf("debug-name:{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s\n", commonName);
X509_free(cert);
}
else
{
printf("error\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("please use command:{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s 127.0.0.1 8081\n", argv[0]);
exit(0);
}
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 ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
perror("Socket");
exit(errno);
}
printf("socket created\n");
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);
}
printf("address created\n");
if (connect(sockfd, (struct sockaddr *) &dest, sizeof(dest)) != 0)
{
perror("Connect ");
exit(errno);
}
printf("server connected\n");
ssl = SSL_new(ctx);
SSL_set_fd(ssl, sockfd);
if (SSL_connect(ssl) == -1)
{
ERR_print_errors_fp(stderr);
}
else
{
printf("Connected with {b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s encryption\n", SSL_get_cipher(ssl));
ShowCerts(ssl);
}
bzero(buffer, MAXBUF + 1);
len = SSL_read(ssl, buffer, MAXBUF);
if (len > 0)
{
printf("{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s:{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}d\n", buffer, len);
}
else
{
printf("{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}d,{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s'\n", errno, strerror(errno));
goto finish;
}
bzero(buffer, MAXBUF + 1);
strcpy(buffer, "hello this is client.");
len = SSL_write(ssl, buffer, strlen(buffer));
if (len < 0)
{
printf("{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s,{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}d,{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s\n", buffer, errno, strerror(errno));
}
else
{
//printf("{b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}s, {b75a474a571334bb08f4db31fa80d7688c6401b1dcf97fb55e06ed241b59472c}d\n", buffer, len);
}
finish:
SSL_shutdown(ssl);
SSL_free(ssl);
close(sockfd);
SSL_CTX_free(ctx);
return 0;
}
编译命令：
gcc -Wall -lssl server.cpp -lstdc++ -o server
gcc -Wall -lssl client.cpp -lstdc++ -o client
执行：
./server cacert.pem privkey.pem
./client 127.0.0.1 8081
OK，这样就能建立连接发送数据了。