/*
    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

static void
zap_handler (void *ctx)
{
    //  Create and bind ZAP socket
    void *zap = zmq_socket (ctx, ZMQ_REP);
    assert (zap);
    int rc = zmq_bind (zap, "inproc://zeromq.zap.01");
    assert (rc == 0);

    //  Process ZAP requests forever
    while (true) {
        char *version = s_recv (zap);
        if (!version)
            break;          //  Terminating
        char *sequence = s_recv (zap);
        char *domain = s_recv (zap);
        char *address = s_recv (zap);
        char *identity = s_recv (zap);
        char *mechanism = s_recv (zap);
        char *username = s_recv (zap);
        char *password = s_recv (zap);

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

        s_sendmore (zap, version);
        s_sendmore (zap, sequence);
        if (streq (username, "admin")
        &&  streq (password, "password")) {
            s_sendmore (zap, "200");
            s_sendmore (zap, "OK");
            s_sendmore (zap, "anonymous");
            s_send (zap, "");
        }
        else {
            s_sendmore (zap, "400");
            s_sendmore (zap, "Invalid username or password");
            s_sendmore (zap, "");
            s_send (zap, "");
        }
        free (version);
        free (sequence);
        free (domain);
        free (address);
        free (identity);
        free (mechanism);
        free (username);
        free (password);
    }
    rc = zmq_close (zap);
    assert (rc == 0);
}

int main (void)
{
    setup_test_environment();
    void *ctx = zmq_ctx_new ();
    assert (ctx);

    //  Spawn ZAP handler
    void *zap_thread = zmq_threadstart (&zap_handler, ctx);

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

    char username [256];
    char password [256];

    //  Check PLAIN security with correct username/password
    void *client = zmq_socket (ctx, ZMQ_DEALER);
    assert (client);
    strcpy (username, "admin");
    rc = zmq_setsockopt (client, ZMQ_PLAIN_USERNAME, username, strlen (username));
    assert (rc == 0);
    strcpy (password, "password");
    rc = zmq_setsockopt (client, ZMQ_PLAIN_PASSWORD, password, strlen (password));
    assert (rc == 0);
    rc = zmq_connect (client, "tcp://localhost:9998");
    assert (rc == 0);
    bounce (server, client);
    rc = zmq_close (client);
    assert (rc == 0);

    //  Check PLAIN security with badly configured client (as_server)
    //  This will be caught by the plain_server class, not passed to ZAP
    client = zmq_socket (ctx, ZMQ_DEALER);
    assert (client);
    as_server = 1;
    rc = zmq_setsockopt (client, ZMQ_PLAIN_SERVER, &as_server, sizeof (int));
    assert (rc == 0);
    rc = zmq_connect (client, "tcp://localhost:9998");
    assert (rc == 0);
    expect_bounce_fail (server, client);
    close_zero_linger (client);

    //  Check PLAIN security -- failed authentication
    client = zmq_socket (ctx, ZMQ_DEALER);
    assert (client);
    strcpy (username, "wronguser");
    strcpy (password, "wrongpass");
    rc = zmq_setsockopt (client, ZMQ_PLAIN_USERNAME, username, strlen (username));
    assert (rc == 0);
    rc = zmq_setsockopt (client, ZMQ_PLAIN_PASSWORD, password, strlen (password));
    assert (rc == 0);
    rc = zmq_connect (client, "tcp://localhost:9998");
    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);

    //  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;
}