/*
 * Copyright (c) 2014 - 2018 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Bill Yuan <bycn82@dragonflybsd.org>
 *
 * 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.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDERS 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/param.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/wait.h>

#include <arpa/inet.h>
#include <ctype.h>
#include <dlfcn.h>
#include <err.h>
#include <errno.h>
#include <grp.h>
#include <limits.h>
#include <netdb.h>
#include <pwd.h>
#include <sysexits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <timeconv.h>
#include <unistd.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/tcp.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/ethernet.h>

#include <net/ipfw3/ip_fw3.h>
#include <net/ipfw3_basic/ip_fw3_basic.h>
#include <net/ipfw3_basic/ip_fw3_table.h>
#include <net/ipfw3_basic/ip_fw3_state.h>
#include <net/ipfw3_basic/ip_fw3_sync.h>
#include <net/ipfw3_nat/ip_fw3_nat.h>
#include <net/dummynet3/ip_dummynet3.h>

#include "ipfw3.h"
#include "ipfw3basic.h"

extern int verbose;
extern int do_time;
extern int do_quiet;
extern int do_force;
extern int do_acct;
extern int do_compact;


void
state_add(int ac, char *av[])
{
        /* TODO */
}

void
state_delete(int ac, char *av[])
{
        int rulenum;
        NEXT_ARG;
        if (ac == 1 && isdigit(**av))
                rulenum = atoi(*av);
        if (do_set_x(IP_FW_STATE_DEL, &rulenum, sizeof(int)) < 0 )
                err(EX_UNAVAILABLE, "do_set_x(IP_FW_STATE_DEL)");
}

void
state_flush(int ac, char *av[])
{
        if (!do_force) {
                int c;

                printf("Are you sure? [yn] ");
                fflush(stdout);
                do {
                        c = toupper(getc(stdin));
                        while (c != '\n' && getc(stdin) != '\n')
                                if (feof(stdin))
                                        return; /* and do not flush */
                } while (c != 'Y' && c != 'N');
                if (c == 'N')   /* user said no */
                        return;
        }
        if (do_set_x(IP_FW_STATE_FLUSH, NULL, 0) < 0 )
                err(EX_UNAVAILABLE, "do_set_x(IP_FW_STATE_FLUSH)");
        if (!do_quiet)
                printf("Flushed all states.\n");
}

void
state_list(int ac, char *av[])
{
        int nbytes, nalloc;
        int rule_id;
        uint8_t *data;

        nalloc = 1024;
        data = NULL;

        NEXT_ARG;
        if (ac == 0)
                rule_id = 0;
        else
                rule_id = strtoul(*av, NULL, 10);

        nbytes = nalloc;
        while (nbytes >= nalloc) {
                nalloc = nalloc * 2;
                nbytes = nalloc;
                if ((data = realloc(data, nbytes)) == NULL) {
                        err(EX_OSERR, "realloc");
                }
                memcpy(data, &rule_id, sizeof(int));
                if (do_get_x(IP_FW_STATE_GET, data, &nbytes) < 0) {
                        err(EX_OSERR, "do_get_x(IP_FW_NAT_GET_RECORD)");
                }
        }

        if (nbytes == 0)
                exit(EX_OK);

        struct ipfw3_ioc_state *ioc;
        ioc =(struct ipfw3_ioc_state *)data;
        int count = nbytes / LEN_IOC_FW3_STATE;
        int i;
        for (i = 0; i < count; i ++) {
                printf("%05u %d", ioc->rule_id, ioc->cpu_id);
                if (ioc->proto == IPPROTO_ICMP) {
                        printf(" icmp");
                } else if (ioc->proto == IPPROTO_TCP) {
                        printf(" tcp");
                } else if (ioc->proto == IPPROTO_UDP) {
                        printf(" udp");
                }
                printf(" %s:%hu",inet_ntoa(ioc->src_addr),
                        htons(ioc->src_port));
                printf(" %s:%hu",inet_ntoa(ioc->dst_addr),
                        htons(ioc->dst_port));
                printf(" %c", ioc->direction? 'o' : 'i');
                printf(" %lld", (long long)ioc->life);
                printf("\n");
                ioc++;
        }
}

void
state_main(int ac, char **av)
{
        if (!strncmp(*av, "add", strlen(*av))) {
                state_add(ac, av);
        } else if (!strncmp(*av, "delete", strlen(*av))) {
                state_delete(ac, av);
        } else if (!strncmp(*av, "flush", strlen(*av))) {
                state_flush(ac, av);
        } else if (!strncmp(*av, "list", strlen(*av))) {
                state_list(ac, av);
        } else if (!strncmp(*av, "show", strlen(*av))) {
                do_acct = 1;
                state_list(ac, av);
        } else {
                errx(EX_USAGE, "bad ipfw3 state command `%s'", *av);
        }
}