/*
    Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file

    This file is part of 0MQ.

    0MQ is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    0MQ is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "testutil.hpp"
#if defined (ZMQ_HAVE_WINDOWS)
#   include <winsock2.h>
#   include <ws2tcpip.h>
#   include <stdexcept>
#   define close closesocket
#else
#   include <sys/socket.h>
#   include <netinet/in.h>
#   include <arpa/inet.h>
#   include <unistd.h>
#endif

//  We'll generate random test keys at startup
static char client_public [41];
static char client_secret [41];
static char server_public [41];
static char server_secret [41];

//  --------------------------------------------------------------------------
//  This methods receives and validates ZAP requestes (allowing or denying
//  each client connection).

static void zap_handler (void *handler)
{
    //  Process ZAP requests forever
    while (true) {
        char *version = s_recv (handler);
        if (!version)
            break;          //  Terminating

        char *sequence = s_recv (handler);
        char *domain = s_recv (handler);
        char *address = s_recv (handler);
        char *identity = s_recv (handler);
        char *mechanism = s_recv (handler);
        uint8_t client_key [32];
        int size = zmq_recv (handler, client_key, 32, 0);
        assert (size == 32);

        char client_key_text [41];
        zmq_z85_encode (client_key_text, client_key, 32);

        assert (streq (version, "1.0"));
        assert (streq (mechanism, "CURVE"));
        assert (streq (identity, "IDENT"));

        s_sendmore (handler, version);
        s_sendmore (handler, sequence);

        if (streq (client_key_text, client_public)) {
            s_sendmore (handler, "200");
            s_sendmore (handler, "OK");
            s_sendmore (handler, "anonymous");
            s_send     (handler, "");
        }
        else {
            s_sendmore (handler, "400");
            s_sendmore (handler, "Invalid client public key");
            s_sendmore (handler, "");
            s_send     (handler, "");
        }
        free (version);
        free (sequence);
        free (domain);
        free (address);
        free (identity);
        free (mechanism);
    }
    zmq_close (handler);
}


int main (void)
{
#ifndef HAVE_LIBSODIUM
    printf ("libsodium not installed, skipping CURVE test\n");
    return 0;
#endif

    //  Generate new keypairs for this test
    int rc = zmq_curve_keypair (client_public, client_secret);
    assert (rc == 0);
    rc = zmq_curve_keypair (server_public, server_secret);
    assert (rc == 0);

    setup_test_environment ();
    void *ctx = zmq_ctx_new ();
    assert (ctx);

    //  Spawn ZAP handler
    //  We create and bind ZAP socket in main thread to avoid case
    //  where child thread does not start up fast enough.
    void *handler = zmq_socket (ctx, ZMQ_REP);
    assert (handler);
    rc = zmq_bind (handler, "inproc://zeromq.zap.01");
    assert (rc == 0);
    void *zap_thread = zmq_threadstart (&zap_handler, handler);

    //  Server socket will accept connections
    void *server = zmq_socket (ctx, ZMQ_DEALER);
    assert (server);
    int as_server = 1;
    rc = zmq_setsockopt (server, ZMQ_CURVE_SERVER, &as_server, sizeof (int));
    assert (rc == 0);
    rc = zmq_setsockopt (server, ZMQ_CURVE_SECRETKEY, server_secret, 41);
    assert (rc == 0);
    rc = zmq_setsockopt (server, ZMQ_IDENTITY, "IDENT", 6);
    assert (rc == 0);
    rc = zmq_bind (server, "tcp://127.0.0.1:9998");
    assert (rc == 0);

    //  Check CURVE security with valid credentials
    void *client = zmq_socket (ctx, ZMQ_DEALER);
    assert (client);
    rc = zmq_setsockopt (client, ZMQ_CURVE_SERVERKEY, server_public, 41);
    assert (rc == 0);
    rc = zmq_setsockopt (client, ZMQ_CURVE_PUBLICKEY, client_public, 41);
    assert (rc == 0);
    rc = zmq_setsockopt (client, ZMQ_CURVE_SECRETKEY, client_secret, 41);
    assert (rc == 0);
    rc = zmq_connect (client, "tcp://localhost:9998");
    assert (rc == 0);
    bounce (server, client);
    rc = zmq_close (client);
    assert (rc == 0);

    //  Check CURVE security with a garbage server key
    //  This will be caught by the curve_server class, not passed to ZAP
    char garbage_key [] = "0000111122223333444455556666777788889999";
    client = zmq_socket (ctx, ZMQ_DEALER);
    assert (client);
    rc = zmq_setsockopt (client, ZMQ_CURVE_SERVERKEY, garbage_key, 41);
    assert (rc == 0);
    rc = zmq_setsockopt (client, ZMQ_CURVE_PUBLICKEY, client_public, 41);
    assert (rc == 0);
    rc = zmq_setsockopt (client, ZMQ_CURVE_SECRETKEY, client_secret, 41);
    assert (rc == 0);
    rc = zmq_connect (client, "tcp://localhost:9998");
    assert (rc == 0);
    expect_bounce_fail (server, client);
    close_zero_linger (client);

    //  Check CURVE security with a garbage client public key
    //  This will be caught by the curve_server class, not passed to ZAP
    client = zmq_socket (ctx, ZMQ_DEALER);
    assert (client);
    rc = zmq_setsockopt (client, ZMQ_CURVE_SERVERKEY, server_public, 41);
    assert (rc == 0);
    rc = zmq_setsockopt (client, ZMQ_CURVE_PUBLICKEY, garbage_key, 41);
    assert (rc == 0);
    rc = zmq_setsockopt (client, ZMQ_CURVE_SECRETKEY, client_secret, 41);
    assert (rc == 0);
    rc = zmq_connect (client, "tcp://localhost:9998");
    assert (rc == 0);
    expect_bounce_fail (server, client);
    close_zero_linger (client);

    //  Check CURVE security with a garbage client secret key
    //  This will be caught by the curve_server class, not passed to ZAP
    client = zmq_socket (ctx, ZMQ_DEALER);
    assert (client);
    rc = zmq_setsockopt (client, ZMQ_CURVE_SERVERKEY, server_public, 41);
    assert (rc == 0);
    rc = zmq_setsockopt (client, ZMQ_CURVE_PUBLICKEY, client_public, 41);
    assert (rc == 0);
    rc = zmq_setsockopt (client, ZMQ_CURVE_SECRETKEY, garbage_key, 41);
    assert (rc == 0);
    rc = zmq_connect (client, "tcp://localhost:9998");
    assert (rc == 0);
    expect_bounce_fail (server, client);
    close_zero_linger (client);

    //  Check CURVE security with bogus client credentials
    //  This must be caught by the ZAP handler
    char bogus_public [41];
    char bogus_secret [41];
    zmq_curve_keypair (bogus_public, bogus_secret);

    client = zmq_socket (ctx, ZMQ_DEALER);
    assert (client);
    rc = zmq_setsockopt (client, ZMQ_CURVE_SERVERKEY, server_public, 41);
    assert (rc == 0);
    rc = zmq_setsockopt (client, ZMQ_CURVE_PUBLICKEY, bogus_public, 41);
    assert (rc == 0);
    rc = zmq_setsockopt (client, ZMQ_CURVE_SECRETKEY, bogus_secret, 41);
    assert (rc == 0);
    rc = zmq_connect (client, "tcp://localhost:9998");
    assert (rc == 0);
    expect_bounce_fail (server, client);
    close_zero_linger (client);

    //  Check CURVE security with NULL client credentials
    //  This must be caught by the curve_server class, not passed to ZAP
    client = zmq_socket (ctx, ZMQ_DEALER);
    assert (client);
    rc = zmq_connect (client, "tcp://localhost:9998");
    assert (rc == 0);
    expect_bounce_fail (server, client);
    close_zero_linger (client);

    //  Check CURVE security with PLAIN client credentials
    //  This must be caught by the curve_server class, not passed to ZAP
    client = zmq_socket (ctx, ZMQ_DEALER);
    assert (client);
    rc = zmq_setsockopt (client, ZMQ_PLAIN_USERNAME, "admin", 5);
    assert (rc == 0);
    rc = zmq_setsockopt (client, ZMQ_PLAIN_PASSWORD, "password", 8);
    assert (rc == 0);
    expect_bounce_fail (server, client);
    close_zero_linger (client);

    // Unauthenticated messages from a vanilla socket shouldn't be received
    struct sockaddr_in ip4addr;
    int s;

    ip4addr.sin_family = AF_INET;
    ip4addr.sin_port = htons (9998);
    inet_pton (AF_INET, "127.0.0.1", &ip4addr.sin_addr);

    s = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
    rc = connect (s, (struct sockaddr*) &ip4addr, sizeof (ip4addr));
    assert (rc > -1);
    // send anonymous ZMTP/1.0 greeting
    send (s, "\x01\x00", 2, 0);
    // send sneaky message that shouldn't be received
    send (s, "\x08\x00sneaky\0", 9, 0);
    int timeout = 150;
    zmq_setsockopt (server, ZMQ_RCVTIMEO, &timeout, sizeof (timeout));
    char *buf = s_recv (server);
    if (buf != NULL) {
        printf ("Received unauthenticated message: %s\n", buf);
        assert (buf == NULL);
    }
    close (s);

    //  Check return codes for invalid buffer sizes
    client = zmq_socket (ctx, ZMQ_DEALER);
    assert (client);
    errno = 0;
    rc = zmq_setsockopt (client, ZMQ_CURVE_SERVERKEY, server_public, 123);
    assert (rc == -1 && errno == EINVAL);
    errno = 0;
    rc = zmq_setsockopt (client, ZMQ_CURVE_PUBLICKEY, client_public, 123);
    assert (rc == -1 && errno == EINVAL);
    errno = 0;
    rc = zmq_setsockopt (client, ZMQ_CURVE_SECRETKEY, client_secret, 123);
    assert (rc == -1 && errno == EINVAL);
    rc = zmq_close (client);
    assert (rc == 0);

    //  Shutdown
    rc = zmq_close (server);
    assert (rc == 0);
    rc = zmq_ctx_term (ctx);
    assert (rc == 0);

    //  Wait until ZAP handler terminates
    zmq_threadclose (zap_thread);

    return 0;
}