/*      $KAME: setkey.c,v 1.28 2003/06/27 07:15:45 itojun Exp $ */

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
 * 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.
 * 3. Neither the name of the 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 PROJECT 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 PROJECT 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/param.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <err.h>
#include <net/route.h>
#include <netinet/in.h>
#include <net/pfkeyv2.h>
#include <netipsec/keydb.h>
#include <netipsec/key_debug.h>
#include <netipsec/ipsec.h>

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#include <netdb.h>

#include "libpfkey.h"

void usage(void);
int main(int, char **);
int get_supported(void);
void sendkeyshort(u_int, uint8_t);
void promisc(void);
int sendkeymsg(char *, size_t);
int postproc(struct sadb_msg *);
const char *numstr(int);
void shortdump_hdr(void);
void shortdump(struct sadb_msg *);
static void printdate(void);
static int32_t gmt2local(time_t);
static int modload(const char *name);

#define MODE_SCRIPT     1
#define MODE_CMDDUMP    2
#define MODE_CMDFLUSH   3
#define MODE_PROMISC    4

static int so;

static int f_forever = 0;
static int f_all = 0;
static int f_verbose = 0;
static int f_mode = 0;
static int f_cmddump = 0;
static int f_policy = 0;
static int f_hexdump = 0;
static int f_tflag = 0;
static int f_scope = 0;
static int f_notimeout = 0;
static time_t thiszone;

extern int lineno;

extern int parse(FILE **);

void
usage(void)
{

        printf("usage: setkey [-v] -c\n");
        printf("       setkey [-v] -f filename\n");
        printf("       setkey [-v] -e \"<script>\"\n");
        printf("       setkey [-Pagltv] -D\n");
        printf("       setkey [-Pv] -F\n");
        printf("       setkey [-h] -x\n");
        exit(1);
}

static int
modload(const char *name)
{
        if (modfind(name) < 0)
                if (kldload(name) < 0 || modfind(name) < 0) {
                        warn("%s: module not found", name);
                        return 0;
        }
        return 1;
}

int
main(int ac, char **av)
{
        FILE *fp = stdin;
        int c;

        if (ac == 1) {
                usage();
                /* NOTREACHED */
        }

        thiszone = gmt2local(0);

        while ((c = getopt(ac, av, "abcde:f:ghltvxDFPZ")) != -1) {
                switch (c) {
                case 'c':
                        f_mode = MODE_SCRIPT;
                        fp = stdin;
                        break;
                case 'e':
                        if (fp != stdin) {
                                err(-1, "only one -f/-e option is accepted");
                        }
                        f_mode = MODE_SCRIPT;
                        fp = fmemopen(optarg, strlen(optarg), "r");
                        if (fp == NULL) {
                                err(-1, "fmemopen");
                                /*NOTREACHED*/
                        }
                        break;
                case 'f':
                        if (fp != stdin) {
                                err(-1, "only one -f/-e option is accepted");
                        }
                        f_mode = MODE_SCRIPT;
                        if ((fp = fopen(optarg, "r")) == NULL) {
                                err(-1, "fopen");
                                /*NOTREACHED*/
                        }
                        break;
                case 'D':
                        f_mode = MODE_CMDDUMP;
                        break;
                case 'F':
                        f_mode = MODE_CMDFLUSH;
                        break;
                case 'a':
                        f_all = 1;
                        break;
                case 'l':
                        f_forever = 1;
                        break;
                case 'h':
                        f_hexdump = 1;
                        break;
                case 'x':
                        f_mode = MODE_PROMISC;
                        f_tflag++;
                        break;
                case 'P':
                        f_policy = 1;
                        break;
                case 'g': /* global */
                        f_scope |= IPSEC_POLICYSCOPE_GLOBAL;
                        break;
                case 't': /* tunnel */
                        f_scope |= IPSEC_POLICYSCOPE_IFNET;
                        break;
                case 'v':
                        f_verbose = 1;
                        break;
                case 'Z':
                        f_notimeout = 1;
                        break;
                default:
                        usage();
                        /*NOTREACHED*/
                }
        }

        modload("ipsec");
        so = pfkey_open();
        if (so < 0) {
                perror("pfkey_open");
                exit(1);
        }

        switch (f_mode) {
        case MODE_CMDDUMP:
                sendkeyshort(f_policy ? SADB_X_SPDDUMP: SADB_DUMP,
                    f_policy ? f_scope: SADB_SATYPE_UNSPEC);
                break;
        case MODE_CMDFLUSH:
                sendkeyshort(f_policy ? SADB_X_SPDFLUSH: SADB_FLUSH,
                    SADB_SATYPE_UNSPEC);
                break;
        case MODE_SCRIPT:
                if (get_supported() < 0) {
                        errx(-1, "%s", ipsec_strerror());
                        /*NOTREACHED*/
                }
                if (parse(&fp))
                        exit (1);
                break;
        case MODE_PROMISC:
                promisc();
                /*NOTREACHED*/
        default:
                usage();
                /*NOTREACHED*/
        }

        exit(0);
}

int
get_supported(void)
{

        if (pfkey_send_register(so, SADB_SATYPE_UNSPEC) < 0)
                return -1;

        if (pfkey_recv_register(so) < 0)
                return -1;

        return 0;
}

void
sendkeyshort(u_int type, uint8_t satype)
{
        struct sadb_msg msg;

        msg.sadb_msg_version = PF_KEY_V2;
        msg.sadb_msg_type = type;
        msg.sadb_msg_errno = 0;
        msg.sadb_msg_satype = satype;
        msg.sadb_msg_len = PFKEY_UNIT64(sizeof(msg));
        msg.sadb_msg_reserved = 0;
        msg.sadb_msg_seq = 0;
        msg.sadb_msg_pid = getpid();

        sendkeymsg((char *)&msg, sizeof(msg));

        return;
}

void
promisc(void)
{
        struct sadb_msg msg;
        u_char rbuf[1024 * 32]; /* XXX: Enough ? Should I do MSG_PEEK ? */
        ssize_t l;

        msg.sadb_msg_version = PF_KEY_V2;
        msg.sadb_msg_type = SADB_X_PROMISC;
        msg.sadb_msg_errno = 0;
        msg.sadb_msg_satype = 1;
        msg.sadb_msg_len = PFKEY_UNIT64(sizeof(msg));
        msg.sadb_msg_reserved = 0;
        msg.sadb_msg_seq = 0;
        msg.sadb_msg_pid = getpid();

        if ((l = send(so, &msg, sizeof(msg), 0)) < 0) {
                err(1, "send");
                /*NOTREACHED*/
        }

        while (1) {
                struct sadb_msg *base;

                if ((l = recv(so, rbuf, sizeof(*base), MSG_PEEK)) < 0) {
                        err(1, "recv");
                        /*NOTREACHED*/
                }

                if (l != sizeof(*base))
                        continue;

                base = (struct sadb_msg *)rbuf;
                if ((l = recv(so, rbuf, PFKEY_UNUNIT64(base->sadb_msg_len),
                                0)) < 0) {
                        err(1, "recv");
                        /*NOTREACHED*/
                }
                printdate();
                if (f_hexdump) {
                        int i;
                        for (i = 0; i < l; i++) {
                                if (i % 16 == 0)
                                        printf("%08x: ", i);
                                printf("%02x ", rbuf[i] & 0xff);
                                if (i % 16 == 15)
                                        printf("\n");
                        }
                        if (l % 16)
                                printf("\n");
                }
                /* adjust base pointer for promisc mode */
                if (base->sadb_msg_type == SADB_X_PROMISC) {
                        if ((ssize_t)sizeof(*base) < l)
                                base++;
                        else
                                base = NULL;
                }
                if (base) {
                        kdebug_sadb(base);
                        printf("\n");
                        fflush(stdout);
                }
        }
}

int
sendkeymsg(char *buf, size_t len)
{
        u_char rbuf[1024 * 32]; /* XXX: Enough ? Should I do MSG_PEEK ? */
        ssize_t l;
        struct sadb_msg *msg;
        struct timeval tv;


        if (!f_notimeout) {
                tv.tv_sec = 1;
                tv.tv_usec = 0;
                if (setsockopt(so, SOL_SOCKET, SO_RCVTIMEO, &tv,
                    sizeof(tv)) < 0) {
                        perror("setsockopt");
                        goto end;
                }
        }

        if (f_forever)
                shortdump_hdr();
again:
        if (f_verbose) {
                kdebug_sadb((struct sadb_msg *)buf);
                printf("\n");
        }
        if (f_hexdump) {
                size_t i;
                for (i = 0; i < len; i++) {
                        if (i % 16 == 0)
                                printf("%08x: ", (u_int)i);
                        printf("%02x ", buf[i] & 0xff);
                        if (i % 16 == 15)
                                printf("\n");
                }
                if (len % 16)
                        printf("\n");
        }

        if ((l = send(so, buf, len, 0)) < 0) {
                perror("send");
                goto end;
        }

        msg = (struct sadb_msg *)rbuf;
        do {
                if ((l = recv(so, rbuf, sizeof(rbuf), 0)) < 0) {
                        perror("recv");
                        goto end;
                }

                if (PFKEY_UNUNIT64(msg->sadb_msg_len) != l) {
                        warnx("invalid keymsg length");
                        break;
                }

                if (f_verbose) {
                        kdebug_sadb((struct sadb_msg *)rbuf);
                        printf("\n");
                }
                if (postproc(msg) < 0)
                        break;
        } while (msg->sadb_msg_errno || msg->sadb_msg_seq);

        if (f_forever) {
                fflush(stdout);
                sleep(1);
                goto again;
        }

end:
        return(0);
}

int
postproc(struct sadb_msg *msg)
{

        if (msg->sadb_msg_errno != 0) {
                char inf[80];
                const char *errmsg = NULL;

                if (f_mode == MODE_SCRIPT)
                        snprintf(inf, sizeof(inf), "The result of line %d: ", lineno);
                else
                        inf[0] = '\0';

                switch (msg->sadb_msg_errno) {
                case ENOENT:
                        switch (msg->sadb_msg_type) {
                        case SADB_DELETE:
                        case SADB_GET:
                        case SADB_X_SPDDELETE:
                                errmsg = "No entry";
                                break;
                        case SADB_DUMP:
                                errmsg = "No SAD entries";
                                break;
                        case SADB_X_SPDDUMP:
                                errmsg = "No SPD entries";
                                break;
                        }
                        break;
                default:
                        errmsg = strerror(msg->sadb_msg_errno);
                }
                printf("%s%s.\n", inf, errmsg);
                return(-1);
        }

        switch (msg->sadb_msg_type) {
        case SADB_GET:
                pfkey_sadump(msg);
                break;

        case SADB_DUMP:
                /* filter out DEAD SAs */
                if (!f_all) {
                        caddr_t mhp[SADB_EXT_MAX + 1];
                        struct sadb_sa *sa;
                        pfkey_align(msg, mhp);
                        pfkey_check(mhp);
                        if ((sa = (struct sadb_sa *)mhp[SADB_EXT_SA]) != NULL) {
                                if (sa->sadb_sa_state == SADB_SASTATE_DEAD)
                                        break;
                        }
                }
                if (f_forever)
                        shortdump(msg);
                else
                        pfkey_sadump(msg);
                msg = (struct sadb_msg *)((caddr_t)msg +
                                     PFKEY_UNUNIT64(msg->sadb_msg_len));
                if (f_verbose) {
                        kdebug_sadb((struct sadb_msg *)msg);
                        printf("\n");
                }
                break;

        case SADB_X_SPDDUMP:
                pfkey_spdump(msg);
                if (msg->sadb_msg_seq == 0) break;
                msg = (struct sadb_msg *)((caddr_t)msg +
                                     PFKEY_UNUNIT64(msg->sadb_msg_len));
                if (f_verbose) {
                        kdebug_sadb((struct sadb_msg *)msg);
                        printf("\n");
                }
                break;
        }

        return(0);
}

/*------------------------------------------------------------*/
static const char *satype[] = {
        NULL, NULL, "ah", "esp"
};
static const char *sastate[] = {
        "L", "M", "D", "d"
};
static const char *ipproto[] = {
/*0*/   "ip", "icmp", "igmp", "ggp", "ip4",
        NULL, "tcp", NULL, "egp", NULL,
/*10*/  NULL, NULL, NULL, NULL, NULL,
        NULL, NULL, "udp", NULL, NULL,
/*20*/  NULL, NULL, "idp", NULL, NULL,
        NULL, NULL, NULL, NULL, "tp",
/*30*/  NULL, NULL, NULL, NULL, NULL,
        NULL, NULL, NULL, NULL, NULL,
/*40*/  NULL, "ip6", NULL, "rt6", "frag6",
        NULL, "rsvp", "gre", NULL, NULL,
/*50*/  "esp", "ah", NULL, NULL, NULL,
        NULL, NULL, NULL, "icmp6", "none",
/*60*/  "dst6",
};

#define STR_OR_ID(x, tab) \
        (((x) < nitems(tab) && tab[(x)]) ? tab[(x)] : numstr(x))

const char *
numstr(int x)
{
        static char buf[20];
        snprintf(buf, sizeof(buf), "#%d", x);
        return buf;
}

void
shortdump_hdr(void)
{
        printf("%-4s %-3s %-1s %-8s %-7s %s -> %s\n",
                "time", "p", "s", "spi", "ltime", "src", "dst");
}

void
shortdump(struct sadb_msg *msg)
{
        caddr_t mhp[SADB_EXT_MAX + 1];
        char buf[NI_MAXHOST], pbuf[NI_MAXSERV];
        struct sadb_sa *sa;
        struct sadb_address *saddr;
        struct sadb_lifetime *lts, *lth, *ltc;
        struct sockaddr *s;
        u_int t;
        time_t cur = time(0);

        pfkey_align(msg, mhp);
        pfkey_check(mhp);

        printf("%02lu%02lu", (u_long)(cur % 3600) / 60, (u_long)(cur % 60));

        printf(" %-3s", STR_OR_ID(msg->sadb_msg_satype, satype));

        if ((sa = (struct sadb_sa *)mhp[SADB_EXT_SA]) != NULL) {
                printf(" %-1s", STR_OR_ID(sa->sadb_sa_state, sastate));
                printf(" %08x", (u_int32_t)ntohl(sa->sadb_sa_spi));
        } else
                printf("%-1s %-8s", "?", "?");

        lts = (struct sadb_lifetime *)mhp[SADB_EXT_LIFETIME_SOFT];
        lth = (struct sadb_lifetime *)mhp[SADB_EXT_LIFETIME_HARD];
        ltc = (struct sadb_lifetime *)mhp[SADB_EXT_LIFETIME_CURRENT];
        if (lts && lth && ltc) {
                if (ltc->sadb_lifetime_addtime == 0)
                        t = (u_long)0;
                else
                        t = (u_long)(cur - ltc->sadb_lifetime_addtime);
                if (t >= 1000)
                        strlcpy(buf, " big/", sizeof(buf));
                else
                        snprintf(buf, sizeof(buf), " %3lu/", (u_long)t);
                printf("%s", buf);

                t = (u_long)lth->sadb_lifetime_addtime;
                if (t >= 1000)
                        strlcpy(buf, "big", sizeof(buf));
                else
                        snprintf(buf, sizeof(buf), "%-3lu", (u_long)t);
                printf("%s", buf);
        } else
                printf(" ??\?/???");    /* backslash to avoid trigraph ??/ */

        printf(" ");

        if ((saddr = (struct sadb_address *)mhp[SADB_EXT_ADDRESS_SRC]) != NULL) {
                if (saddr->sadb_address_proto)
                        printf("%s ", STR_OR_ID(saddr->sadb_address_proto, ipproto));
                s = (struct sockaddr *)(saddr + 1);
                getnameinfo(s, s->sa_len, buf, sizeof(buf),
                        pbuf, sizeof(pbuf), NI_NUMERICHOST|NI_NUMERICSERV);
                if (strcmp(pbuf, "0") != 0)
                        printf("%s[%s]", buf, pbuf);
                else
                        printf("%s", buf);
        } else
                printf("?");

        printf(" -> ");

        if ((saddr = (struct sadb_address *)mhp[SADB_EXT_ADDRESS_DST]) != NULL) {
                if (saddr->sadb_address_proto)
                        printf("%s ", STR_OR_ID(saddr->sadb_address_proto, ipproto));

                s = (struct sockaddr *)(saddr + 1);
                getnameinfo(s, s->sa_len, buf, sizeof(buf),
                        pbuf, sizeof(pbuf), NI_NUMERICHOST|NI_NUMERICSERV);
                if (strcmp(pbuf, "0") != 0)
                        printf("%s[%s]", buf, pbuf);
                else
                        printf("%s", buf);
        } else
                printf("?");

        printf("\n");
}

/* From: tcpdump(1):gmt2local.c and util.c */
/*
 * Print the timestamp
 */
static void
printdate(void)
{
        struct timeval tp;
        int s;

        if (gettimeofday(&tp, NULL) == -1) {
                perror("gettimeofday");
                return;
        }

        if (f_tflag == 1) {
                /* Default */
                s = (tp.tv_sec + thiszone ) % 86400;
                (void)printf("%02d:%02d:%02d.%06u ",
                    s / 3600, (s % 3600) / 60, s % 60, (u_int32_t)tp.tv_usec);
        } else if (f_tflag > 1) {
                /* Unix timeval style */
                (void)printf("%u.%06u ",
                    (u_int32_t)tp.tv_sec, (u_int32_t)tp.tv_usec);
        }

        printf("\n");
}

/*
 * Returns the difference between gmt and local time in seconds.
 * Use gmtime() and localtime() to keep things simple.
 */
int32_t
gmt2local(time_t t)
{
        register int dt, dir;
        register struct tm *gmt, *loc;
        struct tm sgmt;

        if (t == 0)
                t = time(NULL);
        gmt = &sgmt;
        *gmt = *gmtime(&t);
        loc = localtime(&t);
        dt = (loc->tm_hour - gmt->tm_hour) * 60 * 60 +
            (loc->tm_min - gmt->tm_min) * 60;

        /*
         * If the year or julian day is different, we span 00:00 GMT
         * and must add or subtract a day. Check the year first to
         * avoid problems when the julian day wraps.
         */
        dir = loc->tm_year - gmt->tm_year;
        if (dir == 0)
                dir = loc->tm_yday - gmt->tm_yday;
        dt += dir * 24 * 60 * 60;

        return (dt);
}