/*      $NetBSD: t_forward.c,v 1.10 2017/01/13 21:30:42 christos Exp $  */

/*-
 * Copyright (c) 2010 The NetBSD Foundation, Inc.
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: t_forward.c,v 1.10 2017/01/13 21:30:42 christos Exp $");
#endif /* not lint */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/sysctl.h>
#include <sys/wait.h>

#include <arpa/inet.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/icmp_var.h>
#include <net/route.h>

#include <rump/rump.h>
#include <rump/rump_syscalls.h>

#include <atf-c.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "h_macros.h"
#include "../config/netconfig.c"

/*
 * Since our maxttl is in our private namespace, we don't need raw packet
 * construction like traceroute(8) -- we can just use the global maxttl.
 */
static void
sendttl(void)
{
        struct sockaddr_in sin;
        char payload[1024];
        char ifname[IFNAMSIZ];
        int mib[4] = { CTL_NET, PF_INET, IPPROTO_IP, IPCTL_DEFTTL };
        int nv;
        int s;

        netcfg_rump_makeshmif("bus1", ifname);
        netcfg_rump_if(ifname, "1.0.0.1", "255.255.255.0");
        netcfg_rump_route("0.0.0.0", "0.0.0.0", "1.0.0.2"); /* default router */

        /* set global ttl to 1 */
        nv = 1;
        if (rump_sys___sysctl(mib, 4, NULL, NULL, &nv, sizeof(nv)) == -1)
                atf_tc_fail_errno("set ttl");

        s = rump_sys_socket(PF_INET, SOCK_DGRAM, 0);
        if (s == -1)
                atf_tc_fail_errno("create send socket");

        memset(&sin, 0, sizeof(sin));
        sin.sin_len = sizeof(sin);
        sin.sin_family = AF_INET;
        sin.sin_port = htons(33434);
        sin.sin_addr.s_addr = inet_addr("9.9.9.9");

        /* send udp datagram with ttl == 1 */
        if (rump_sys_sendto(s, payload, sizeof(payload), 0,
            (struct sockaddr *)&sin, sizeof(sin)) == -1)
                atf_tc_fail_errno("sendto");
}

static void
router(void)
{
        int mib[4] = { CTL_NET, PF_INET, IPPROTO_ICMP,
                    ICMPCTL_RETURNDATABYTES };
        char ifname[IFNAMSIZ];
        int nv;

        /* set returndatabytes to 200 */
        nv = 200;
        if (rump_sys___sysctl(mib, 4, NULL, NULL, &nv, sizeof(nv)) == -1)
                atf_tc_fail_errno("sysctl returndatabytes");

        netcfg_rump_makeshmif("bus1", ifname);
        netcfg_rump_if(ifname, "1.0.0.2", "255.255.255.0");

        /*
         * Wait for parent to send us the data and for us to have
         * a chance to process it.
         */
        sleep(1);
        exit(0);
}

ATF_TC(returndatabytes);
ATF_TC_HEAD(returndatabytes, tc)
{

        atf_tc_set_md_var(tc, "descr", "icmp.returndatabytes with certain "
            "packets can cause kernel panic (PR kern/43548)");
        atf_tc_set_md_var(tc, "timeout", "20"); /* just in case */
}

ATF_TC_BODY(returndatabytes, tc)
{
        pid_t cpid;
        int status;

        cpid = fork();
        rump_init();

        switch (cpid) {
        case -1:
                atf_tc_fail_errno("fork failed");
        case 0:
                router();
                break;
        default:
                sendttl();
                if (wait(&status) == -1)
                        atf_tc_fail_errno("wait");
                if (WIFEXITED(status)) {
                        if (WEXITSTATUS(status))
                                atf_tc_fail("child exited with status %d",
                                    WEXITSTATUS(status));
                } else {
                        atf_tc_fail("child died");
                }
        }
}

ATF_TP_ADD_TCS(tp)
{

        ATF_TP_ADD_TC(tp, returndatabytes);

        return atf_no_error();
}