/*
    Copyright (c) 2007-2014 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 <string.h>
#include <sys/types.h>

#include <string>
#include <sstream>

#include "testutil.hpp"

static void bounce_fail (void *server, void *client)
{
    const char *content = "12345678ABCDEFGH12345678abcdefgh";
    char buffer [32];

    //  Send message from client to server
    int rc = zmq_send (client, content, 32, ZMQ_SNDMORE);
    assert (rc == 32);
    rc = zmq_send (client, content, 32, 0);
    assert (rc == 32);

    //  Receive message at server side (should not succeed)
    int timeout = 150;
    rc = zmq_setsockopt (server, ZMQ_RCVTIMEO, &timeout, sizeof (int));
    assert (rc == 0);
    rc = zmq_recv (server, buffer, 32, 0);
    assert (rc == -1);
    assert (zmq_errno () == EAGAIN);

    //  Send message from server to client to test other direction
    rc = zmq_setsockopt (server, ZMQ_SNDTIMEO, &timeout, sizeof (int));
    assert (rc == 0);
    rc = zmq_send (server, content, 32, ZMQ_SNDMORE);
    assert (rc == -1);
    assert (zmq_errno () == EAGAIN);
}

template <class T>
static void run_test (int opt, T optval, int expected_error, int bounce_test)
{
    int rc;

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

    void *sb = zmq_socket (ctx, ZMQ_DEALER);
    assert (sb);

    if (opt) {
        rc = zmq_setsockopt(sb, opt, &optval, sizeof (optval));
        if (expected_error) {
            assert (rc == -1);
            assert (zmq_errno () == expected_error);
        } else {
            assert (rc == 0);
        }
    }

    void *sc = zmq_socket (ctx, ZMQ_DEALER);
    assert (sc);

    // If a test fails, don't hang for too long
    int timeout = 1500;
    rc = zmq_setsockopt (sb, ZMQ_RCVTIMEO, &timeout, sizeof (int));
    assert (rc == 0);
    rc = zmq_setsockopt (sb, ZMQ_SNDTIMEO, &timeout, sizeof (int));
    assert (rc == 0);
    rc = zmq_setsockopt (sc, ZMQ_RCVTIMEO, &timeout, sizeof (int));
    assert (rc == 0);
    rc = zmq_setsockopt (sc, ZMQ_SNDTIMEO, &timeout, sizeof (int));
    assert (rc == 0);
    int interval = -1;
    rc = zmq_setsockopt (sc, ZMQ_RECONNECT_IVL, &interval, sizeof (int));
    assert (rc == 0);

    if (bounce_test) {
        const char* endpoint = "ipc://test_filter_ipc.sock";
        int rc = zmq_bind (sb, endpoint);
        assert (rc == 0);

        rc = zmq_connect (sc, endpoint);
        assert (rc == 0);
        
        if (bounce_test > 0)
            bounce (sb, sc);
        else
            bounce_fail (sb, sc);
    }

    close_zero_linger (sc);
    close_zero_linger (sb);

    rc = zmq_ctx_term (ctx);
    assert (rc == 0);
}

int main (void)
{
    setup_test_environment();

    // No filters
    run_test<int> (0, 0, 0, 1);

#if defined ZMQ_HAVE_SO_PEERCRED || defined ZMQ_HAVE_LOCAL_PEERCRED
    // Get the group and supplimental groups of the process owner
    gid_t groups[100];
    int ngroups = getgroups(100, groups);
    assert (ngroups != -1);
    gid_t group = getgid(), supgroup = groups[0], notgroup = groups[ngroups - 1] + 1;
    for (int i = 0; i < ngroups; i++) {
        if (supgroup == group && group != groups[i])
            supgroup = groups[i];
        if (notgroup <= groups[i])
            notgroup = groups[i] + 1;
    }

    // Test filter with UID of process owner
    run_test<uid_t> (ZMQ_IPC_FILTER_UID, getuid(), 0, 1);
    // Test filter with UID of another (possibly non-existent) user
    run_test<uid_t> (ZMQ_IPC_FILTER_UID, getuid() + 1, 0, -1);
    // Test filter with GID of process owner
    run_test<gid_t> (ZMQ_IPC_FILTER_GID, group, 0, 1);
    // Test filter with supplimental group of process owner
    run_test<gid_t> (ZMQ_IPC_FILTER_GID, supgroup, 0, 1);
    // Test filter with GID of another (possibly non-existent) group
    run_test<gid_t> (ZMQ_IPC_FILTER_GID, notgroup, 0, -1);
#   if defined ZMQ_HAVE_SO_PEERCRED
    // Test filter with PID of current process
    run_test<pid_t> (ZMQ_IPC_FILTER_PID, getpid(), 0, 1);
    // Test filter with PID of another (possibly non-existent) process
    run_test<pid_t> (ZMQ_IPC_FILTER_PID, getpid() + 1, 0, -1);
#   else
    // Setup of PID filter should fail with operation not supported error
    run_test<pid_t> (ZMQ_IPC_FILTER_PID, getpid(), EINVAL, 0);
#   endif
#else
    run_test<uid_t> (ZMQ_IPC_FILTER_UID, 0, EINVAL, 0);
    run_test<gid_t> (ZMQ_IPC_FILTER_GID, 0, EINVAL, 0);
    run_test<pid_t> (ZMQ_IPC_FILTER_PID, 0, EINVAL, 0);
#endif // defined ZMQ_HAVE_SO_PEERCRED || defined ZMQ_HAVE_LOCAL_PEERCRED

    return 0 ;
}

