1 files changed, 112 insertions, 0 deletions
diff --git a/client.c b/client.c
new file mode 100644
index 0000000..666a519
--- /dev/null
+++ b/client.c
@@ -0,0 +1,112 @@
+
+#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;
+
+}