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#include <netdb.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include "common.h"
int main(void)
{
const SSL_METHOD *meth;
SSL_CTX *ctx;
int ret;
int sd;
struct sockaddr_in sa;
SSL *ssl;
X509 *server_cert;
char *str;
char buf[64];
/* Crypto */
SSL_load_error_strings();
OpenSSL_add_ssl_algorithms();
meth = TLSv1_2_client_method();
ctx = SSL_CTX_new(meth);
CHK_NULL(ctx);
ret = SSL_CTX_use_certificate_chain_file(ctx, "clientcert.pem");
CHK_SSL(ret);
ret = SSL_CTX_use_PrivateKey_file(ctx, "clientkey.pem", SSL_FILETYPE_PEM);
CHK_SSL(ret);
ret = SSL_CTX_check_private_key(ctx);
CHK_SSL(ret);
/* Networking */
sd = socket(AF_INET, SOCK_STREAM, 0);
CHK_ERR(sd, "socket");
memset(&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = inet_addr("127.0.0.1");
sa.sin_port = htons(1111);
ret = connect(sd, (struct sockaddr *)&sa, sizeof(sa));
CHK_ERR(ret, "connect");
/* SSL negotiation. */
ssl = SSL_new(ctx);
CHK_NULL(ssl);
SSL_set_fd(ssl, sd);
ret = SSL_connect(ssl);
CHK_SSL_WRAPPER(ret);
/* Info */
printf("SSL connection using %s\n", SSL_get_cipher(ssl));
server_cert = SSL_get_peer_certificate(ssl);
CHK_NULL(server_cert);
printf("Server certificate:\n");
str = X509_NAME_oneline(X509_get_subject_name(server_cert), 0, 0);
CHK_NULL(str);
printf("\tsubject: %s\n", str);
OPENSSL_free(str);
str = X509_NAME_oneline(X509_get_issuer_name(server_cert), 0, 0);
CHK_NULL(str);
printf("\tissuer: %s\n", str);
OPENSSL_free(str);
X509_free(server_cert);
/* Exchange */
ret = SSL_write(ssl, "Hello Server!", strlen("Hello Server!"));
CHK_SSL_WRAPPER(ret);
ret = SSL_read(ssl, buf, sizeof(buf) - 1);
CHK_SSL_WRAPPER(ret);
buf[ret] = '\0';
printf("Got %d chars: '%s'\n", ret, buf);
/* End */
SSL_shutdown(ssl);
close(sd);
SSL_free(ssl);
SSL_CTX_free(ctx);
return EXIT_SUCCESS;
}
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