/*-
 * Copyright (c) 2004 Robert N. M. Watson
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/module.h>
#include <sys/socket.h>

#include <netinet/in.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define ACCF_NAME       "dataready"

/*
 * A number of small tests to confirm that attaching ACCF_DATA accept filters
 * to inet4 ports works as expected.  We test:
 *
 * - That no accept filter is attached on a newly created socket.
 * - That bind() has no affect on the accept filter state.
 * - That we can't attach an accept filter to a socket that isn't in the
 *   listen state.
 * - That after we fail to attach the filter, querying the kernel shows no
 *   filter attached.
 * - That we can attach an accept filter to a socket that is in the listen
 *   state.
 * - That once an accept filter is attached, we can query to make sure it is
 *   attached.
 * - That once an accept filter is attached, we can remove it and query to
 *   make sure it is removed.
 */
int
main(void)
{
        struct accept_filter_arg afa;
        struct sockaddr_in sin;
        struct linger linger;
        socklen_t len;
        int lso, so, i, ret;

        /* XXX: PLAIN_TEST_REQUIRE_MODULE "backport" for stable/9 */
        const char *_mod_name = "accf_data";

        if (modfind(_mod_name) == -1) {
                printf("1..0 # SKIP - module %s could not be resolved: %s\n",
                    _mod_name, strerror(errno));
                _exit(0);
        }
        /* XXX: PLAIN_TEST_REQUIRE_MODULE for stable/9 */

        printf("1..12\n");

        /*
         * Step 0. Open socket().
         */
        lso = socket(PF_INET, SOCK_STREAM, 0);
        if (lso == -1)
                errx(-1, "not ok 1 - socket: %s", strerror(errno));
        printf("ok 1 - socket\n");

        /*
         * Step 1. After socket().  Should return EINVAL, since no accept
         * filter should be attached.
         */
        bzero(&afa, sizeof(afa));
        len = sizeof(afa);
        ret = getsockopt(lso, SOL_SOCKET, SO_ACCEPTFILTER, &afa, &len);
        if (ret != -1)
                errx(-1, "not ok 2 - getsockopt() after socket() succeeded");
        if (errno != EINVAL)
                errx(-1, "not ok 2 - getsockopt() after socket() failed with "
                    "%d (%s)", errno, strerror(errno));
        printf("ok 2 - getsockopt\n");

        /*
         * Step 2. Bind().  Ideally this will succeed.
         */
        setsockopt(lso, SOL_SOCKET, SO_REUSEADDR, &lso, sizeof(lso));
        bzero(&sin, sizeof(sin));
        sin.sin_len = sizeof(sin);
        sin.sin_family = AF_INET;
        sin.sin_port = htons(8080);
        sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
        if (bind(lso, (struct sockaddr *)&sin, sizeof(sin)) < 0)
                errx(-1, "not ok 3 - bind %s", strerror(errno));
        printf("ok 3 - bind\n");

        /*
         * Step 3: After bind().  getsockopt() should return EINVAL, since no
         *  accept filter should be attached.
         */
        len = sizeof(afa);
        ret = getsockopt(lso, SOL_SOCKET, SO_ACCEPTFILTER, &afa, &len);
        if (ret != -1)
                errx(-1, "not ok 4 - getsockopt() after bind() succeeded");
        if (errno != EINVAL)
                errx(-1, "not ok 4 -  getsockopt() after bind() failed with %d (%s)",
                    errno, strerror(errno));
        printf("ok 4 - getsockopt\n");

        /*
         * Step 4: Setsockopt() before listen().  Should fail, since it's not
         * yet a listen() socket.
         */
        bzero(&afa, sizeof(afa));
        strncpy(afa.af_name, ACCF_NAME, sizeof(afa.af_name));
        ret = setsockopt(lso, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa));
        if (ret == 0)
                errx(-1, "not ok 5 - setsockopt() before listen() succeeded");
        printf("ok 5 - setsockopt\n");

        /*
         * Step 5: Getsockopt() after pre-listen() setsockopt().  Should
         * fail with EINVAL, since setsockopt() should have failed.
         */
        len = sizeof(afa);
        ret = getsockopt(lso, SOL_SOCKET, SO_ACCEPTFILTER, &afa, &len);
        if (ret == 0)
                errx(-1, "not ok 6 - getsockopt() after pre-listen() setsockopt() "
                    "succeeded");
        if (errno != EINVAL)
                errx(-1, "not ok 6 - pre-listen() getsockopt() failed with %d (%s)",
                    errno, strerror(errno));
        printf("ok 6 - getsockopt\n");

        /*
         * Step 6: listen().
         */
        if (listen(lso, -1) < 0)
                errx(-1, "not ok 7 - listen: %s", strerror(errno));
        printf("ok 7 - listen\n");

        /*
         * Step 7: Getsockopt() after listen().  Should fail with EINVAL,
         * since we have not installed accept filter yet.
         */
        len = sizeof(afa);
        ret = getsockopt(lso, SOL_SOCKET, SO_ACCEPTFILTER, &afa, &len);
        if (ret == 0)
                errx(-1, "not ok 8 - getsockopt() after listen() but before "
                    "setsockopt() succeeded");
        if (errno != EINVAL)
                errx(-1, "not ok 8 - getsockopt() after listen() but before "
                    "setsockopt() failed with %d (%s)", errno, strerror(errno));
        printf("ok 8 - getsockopt\n");

        /*
         * Step 8: After listen().  This call to setsockopt() should succeed.
         */
        bzero(&afa, sizeof(afa));
        strncpy(afa.af_name, ACCF_NAME, sizeof(afa.af_name));
        ret = setsockopt(lso, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa));
        if (ret != 0)
                errx(-1, "not ok 9 - setsockopt() after listen() failed with %d "
                    "(%s)", errno, strerror(errno));
        printf("ok 9 - setsockopt\n");

        /*
         * Step 9: After setsockopt().  Should succeed and identify
         * ACCF_NAME.
         */
        bzero(&afa, sizeof(afa));
        len = sizeof(afa);
        ret = getsockopt(lso, SOL_SOCKET, SO_ACCEPTFILTER, &afa, &len);
        if (ret != 0)
                errx(-1, "not ok 10 - getsockopt() after listen() setsockopt() "
                    "failed with %d (%s)", errno, strerror(errno));
        if (len != sizeof(afa))
                errx(-1, "not ok 10 - getsockopt() after setsockopet()  after "
                    "listen() returned wrong size (got %d expected %zd)", len,
                    sizeof(afa));
        if (strcmp(afa.af_name, ACCF_NAME) != 0)
                errx(-1, "not ok 10 - getsockopt() after setsockopt() after "
                    "listen() mismatch (got %s expected %s)", afa.af_name,
                    ACCF_NAME);
        printf("ok 10 - getsockopt\n");

        /*
         * Step 10: Set listening socket to non blocking mode.  Open
         * connection to our listening socket and try to accept.  Should
         * no succeed.  Write a byte of data and try again.  Should accept.
         */
        i = fcntl(lso, F_GETFL);
        if (i < 0)
                errx(-1, "not ok 11 - ioctl(F_GETFL): %s", strerror(errno));
        i |= O_NONBLOCK;
        if (fcntl(lso, F_SETFL, i) != 0)
                errx(-1, "not ok 11 - ioctl(F_SETFL): %s", strerror(errno));
        so = socket(PF_INET, SOCK_STREAM, 0);
        if (so == -1)
                errx(-1, "not ok 11 - socket: %s", strerror(errno));
        if (connect(so, (struct sockaddr *)&sin, sizeof(sin)) < 0)
                errx(-1, "not ok 11 - connect %s", strerror(errno));
        if (accept(lso, NULL, 0) != -1 && errno != EWOULDBLOCK)
                errx(-1, "not ok 11 - accept #1 %s", strerror(errno));
        if (write(so, "0", 1) != 1)
                errx(-1, "not ok 11 - write %s", strerror(errno));
        /*
         * XXXGL: ugly, but we need to make sure that our write reaches
         * remote side of the socket.
         */
        usleep(10000);
        if (accept(lso, NULL, 0) < 1)
                errx(-1, "not ok 11 - accept #2 %s", strerror(errno));
        if (close(so) != 0)
                errx(-1, "not ok 11 - close(): %s", strerror(errno));
        printf("ok 11 - accept\n");

        /*
         * Step 12: reset connection before accept filter allows it.
         * In this case the connection must make it to the listen
         * queue, but with ECONNABORTED code.
         */
        so = socket(PF_INET, SOCK_STREAM, 0);
        if (so == -1)
                errx(-1, "not ok 12 - socket: %s", strerror(errno));
        if (connect(so, (struct sockaddr *)&sin, sizeof(sin)) < 0)
                errx(-1, "not ok 12 - connect %s", strerror(errno));
        linger.l_onoff = 1;
        linger.l_linger = 0;
        ret = setsockopt(so, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger));
        if (ret != 0)
                errx(-1, "not ok 12 - setsockopt(SO_LINGER) failed with %d "
                    "(%s)", errno, strerror(errno));
        if (close(so) != 0)
                errx(-1, "not ok 12 - close(): %s", strerror(errno));
        if (accept(lso, NULL, 0) != -1 && errno != ECONNABORTED)
                errx(-1, "not ok 12 - accept #3 %s", strerror(errno));
        printf("ok 12 - accept\n");

#if 1
        /*
         * XXXGL: this doesn't belong to the test itself, but is known
         * to examine rarely examined paths in the kernel.  Intentionally
         * leave a socket on the incomplete queue, before the program
         * exits.
         */
        so = socket(PF_INET, SOCK_STREAM, 0);
        if (so == -1)
                errx(-1, "not ok 13 - socket: %s", strerror(errno));
        if (connect(so, (struct sockaddr *)&sin, sizeof(sin)) < 0)
                errx(-1, "not ok 13 - connect %s", strerror(errno));
#endif

        /*
         * Step 12: Remove accept filter.  After removing the accept filter
         * getsockopt() should fail with EINVAL.
         */
        ret = setsockopt(lso, SOL_SOCKET, SO_ACCEPTFILTER, NULL, 0);
        if (ret != 0)
                errx(-1, "not ok 13 - setsockopt() after listen() "
                    "failed with %d (%s)", errno, strerror(errno));
        bzero(&afa, sizeof(afa));
        len = sizeof(afa);
        ret = getsockopt(lso, SOL_SOCKET, SO_ACCEPTFILTER, &afa, &len);
        if (ret == 0)
                errx(-1, "not ok 13 - getsockopt() after removing "
                    "the accept filter returns valid accept filter %s",
                    afa.af_name);
        if (errno != EINVAL)
                errx(-1, "not ok 13 - getsockopt() after removing the accept"
                    "filter failed with %d (%s)", errno, strerror(errno));
        if (close(lso) != 0)
                errx(-1, "not ok 13 - close() of listening socket: %s",
                    strerror(errno));
        printf("ok 13 - setsockopt\n");

        return (0);
}