From 36082a2fe36ecd800d784ae44c14f1f18c66a7e9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 28 Apr 2024 09:33:12 +0200
Subject: Adding upstream version 3.7.9.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 doc/examples/ex-client-srp.c | 128 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 doc/examples/ex-client-srp.c

(limited to 'doc/examples/ex-client-srp.c')

diff --git a/doc/examples/ex-client-srp.c b/doc/examples/ex-client-srp.c
new file mode 100644
index 0000000..e023289
--- /dev/null
+++ b/doc/examples/ex-client-srp.c
@@ -0,0 +1,128 @@
+/* This example code is placed in the public domain. */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <gnutls/gnutls.h>
+
+/* Those functions are defined in other examples.
+ */
+extern void check_alert(gnutls_session_t session, int ret);
+extern int tcp_connect(void);
+extern void tcp_close(int sd);
+
+#define MAX_BUF 1024
+#define USERNAME "user"
+#define PASSWORD "pass"
+#define CAFILE "/etc/ssl/certs/ca-certificates.crt"
+#define MSG "GET / HTTP/1.0\r\n\r\n"
+
+int main(void)
+{
+        int ret;
+        int sd, ii;
+        gnutls_session_t session;
+        char buffer[MAX_BUF + 1];
+        gnutls_srp_client_credentials_t srp_cred;
+        gnutls_certificate_credentials_t cert_cred;
+
+        if (gnutls_check_version("3.1.4") == NULL) {
+                fprintf(stderr, "GnuTLS 3.1.4 or later is required for this example\n");
+                exit(1);
+        }
+
+        /* for backwards compatibility with gnutls < 3.3.0 */
+        gnutls_global_init();
+
+        gnutls_srp_allocate_client_credentials(&srp_cred);
+        gnutls_certificate_allocate_credentials(&cert_cred);
+
+        gnutls_certificate_set_x509_trust_file(cert_cred, CAFILE,
+                                               GNUTLS_X509_FMT_PEM);
+        gnutls_srp_set_client_credentials(srp_cred, USERNAME, PASSWORD);
+
+        /* connects to server
+         */
+        sd = tcp_connect();
+
+        /* Initialize TLS session
+         */
+        gnutls_init(&session, GNUTLS_CLIENT);
+
+
+        /* Set the priorities.
+         */
+        gnutls_priority_set_direct(session,
+                                   "NORMAL:+SRP:+SRP-RSA:+SRP-DSS",
+                                   NULL);
+
+        /* put the SRP credentials to the current session
+         */
+        gnutls_credentials_set(session, GNUTLS_CRD_SRP, srp_cred);
+        gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, cert_cred);
+
+        gnutls_transport_set_int(session, sd);
+        gnutls_handshake_set_timeout(session,
+                                     GNUTLS_DEFAULT_HANDSHAKE_TIMEOUT);
+
+        /* Perform the TLS handshake
+         */
+        do {
+                ret = gnutls_handshake(session);
+        }
+        while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+
+        if (ret < 0) {
+                fprintf(stderr, "*** Handshake failed\n");
+                gnutls_perror(ret);
+                goto end;
+        } else {
+                char *desc;
+
+                desc = gnutls_session_get_desc(session);
+                printf("- Session info: %s\n", desc);
+                gnutls_free(desc);
+        }
+
+        gnutls_record_send(session, MSG, strlen(MSG));
+
+        ret = gnutls_record_recv(session, buffer, MAX_BUF);
+        if (gnutls_error_is_fatal(ret) != 0 || ret == 0) {
+                if (ret == 0) {
+                        printf
+                            ("- Peer has closed the GnuTLS connection\n");
+                        goto end;
+                } else {
+                        fprintf(stderr, "*** Error: %s\n",
+                                gnutls_strerror(ret));
+                        goto end;
+                }
+        } else
+                check_alert(session, ret);
+
+        if (ret > 0) {
+                printf("- Received %d bytes: ", ret);
+                for (ii = 0; ii < ret; ii++) {
+                        fputc(buffer[ii], stdout);
+                }
+                fputs("\n", stdout);
+        }
+        gnutls_bye(session, GNUTLS_SHUT_RDWR);
+
+      end:
+
+        tcp_close(sd);
+
+        gnutls_deinit(session);
+
+        gnutls_srp_free_client_credentials(srp_cred);
+        gnutls_certificate_free_credentials(cert_cred);
+
+        gnutls_global_deinit();
+
+        return 0;
+}
-- 
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