[apple/network_cmds.git] / racoon.tproj / isakmp.c

/*      $KAME: isakmp.c,v 1.176 2002/08/28 04:08:30 itojun Exp $        */

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 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/socket.h>
#include <sys/queue.h>

#include <netkey/key_var.h>
#include <netinet/in.h>

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif
#include <netdb.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <ctype.h>

#if !defined(HAVE_GETADDRINFO) || !defined(HAVE_GETNAMEINFO)
#include "addrinfo.h"
#endif

#include "var.h"
#include "misc.h"
#include "vmbuf.h"
#include "plog.h"
#include "sockmisc.h"
#include "schedule.h"
#include "debug.h"

#include "remoteconf.h"
#include "localconf.h"
#include "grabmyaddr.h"
#include "isakmp_var.h"
#include "isakmp.h"
#include "oakley.h"
#include "handler.h"
#include "ipsec_doi.h"
#include "pfkey.h"
#include "crypto_openssl.h"
#include "policy.h"
#include "isakmp_ident.h"
#include "isakmp_agg.h"
#include "isakmp_base.h"
#include "isakmp_quick.h"
#include "isakmp_inf.h"
#include "isakmp_newg.h"
#include "strnames.h"
#ifndef HAVE_ARC4RANDOM
#include "arc4random.h"
#endif

static int nostate1 __P((struct ph1handle *, vchar_t *));
static int nostate2 __P((struct ph2handle *, vchar_t *));

extern caddr_t val2str(const char *, size_t);

static int (*ph1exchange[][2][PHASE1ST_MAX])
        __P((struct ph1handle *, vchar_t *)) = {
 /* error */
 { {}, {}, },
 /* Identity Protection exchange */
 {
  { nostate1, ident_i1send, nostate1, ident_i2recv, ident_i2send,
    ident_i3recv, ident_i3send, ident_i4recv, ident_i4send, nostate1, },
  { nostate1, ident_r1recv, ident_r1send, ident_r2recv, ident_r2send,
    ident_r3recv, ident_r3send, nostate1, nostate1, nostate1, },
 },
 /* Aggressive exchange */
 {
  { nostate1, agg_i1send, nostate1, agg_i2recv, agg_i2send,
    nostate1, nostate1, nostate1, nostate1, nostate1, },
  { nostate1, agg_r1recv, agg_r1send, agg_r2recv, agg_r2send,
    nostate1, nostate1, nostate1, nostate1, nostate1, },
 },
 /* Base exchange */
 {
  { nostate1, base_i1send, nostate1, base_i2recv, base_i2send,
    base_i3recv, base_i3send, nostate1, nostate1, nostate1, },
  { nostate1, base_r1recv, base_r1send, base_r2recv, base_r2send,
    nostate1, nostate1, nostate1, nostate1, nostate1, },
 },
};

static int (*ph2exchange[][2][PHASE2ST_MAX])
        __P((struct ph2handle *, vchar_t *)) = {
 /* error */
 { {}, {}, },
 /* Quick mode for IKE*/
 {
  { nostate2, nostate2, quick_i1prep, nostate2, quick_i1send,
    quick_i2recv, quick_i2send, quick_i3recv, nostate2, nostate2, },
  { nostate2, quick_r1recv, quick_r1prep, nostate2, quick_r2send,
    quick_r3recv, quick_r3prep, quick_r3send, nostate2, nostate2, }
 },
};

static u_char r_ck0[] = { 0,0,0,0,0,0,0,0 }; /* used to verify the r_ck. */
 
static int isakmp_main __P((vchar_t *, struct sockaddr *, struct sockaddr *));
static int ph1_main __P((struct ph1handle *, vchar_t *));
static int quick_main __P((struct ph2handle *, vchar_t *));
static int isakmp_ph1begin_r __P((vchar_t *,
        struct sockaddr *, struct sockaddr *, u_int8_t));
static int isakmp_ph2begin_i __P((struct ph1handle *, struct ph2handle *));
static int isakmp_ph2begin_r __P((struct ph1handle *, vchar_t *));
static int etypesw1 __P((int));
static int etypesw2 __P((int));

/*
 * isakmp packet handler
 */
int
isakmp_handler(so_isakmp)
        int so_isakmp;
{
        struct isakmp isakmp;
        struct sockaddr_storage remote;
        struct sockaddr_storage local;
        int remote_len = sizeof(remote);
        int local_len = sizeof(local);
        int len;
        u_short port;
        vchar_t *buf = NULL;
        int error = -1;

        /* read message by MSG_PEEK */
        while ((len = recvfromto(so_isakmp, (char *)&isakmp, sizeof(isakmp),
                    MSG_PEEK, (struct sockaddr *)&remote, &remote_len,
                    (struct sockaddr *)&local, &local_len)) < 0) {
                if (errno == EINTR)
                        continue;
                plog(LLV_ERROR, LOCATION, NULL,
                        "failed to receive isakmp packet\n");
                goto end;
        }

        /* check isakmp header length, as well as sanity of header length */
        if (len < sizeof(isakmp) || ntohl(isakmp.len) < sizeof(isakmp)) {
                plog(LLV_ERROR, LOCATION, (struct sockaddr *)&remote,
                        "packet shorter than isakmp header size.\n");
                /* dummy receive */
                if ((len = recvfrom(so_isakmp, (char *)&isakmp, sizeof(isakmp),
                                0, (struct sockaddr *)&remote, &remote_len)) < 0) {
                        plog(LLV_ERROR, LOCATION, NULL,
                                "failed to receive isakmp packet\n");
                }
                goto end;
        }
        
        /* reject if the size is toooo big */
        if (ntohl(isakmp.len) > 0xffff) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "the length of the isakmp header is too big.\n");
                if ((len = recvfrom(so_isakmp, (char *)&isakmp, sizeof(isakmp),
                            0, (struct sockaddr *)&remote, &remote_len)) < 0) {
                        plog(LLV_ERROR, LOCATION, NULL,
                                "failed to receive isakmp packet\n");
                }
                goto end;
        }

        /* read real message */
        if ((buf = vmalloc(ntohl(isakmp.len))) == NULL) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "failed to allocate reading buffer\n");
                /* dummy receive */
                if ((len = recvfrom(so_isakmp, (char *)&isakmp, sizeof(isakmp),
                            0, (struct sockaddr *)&remote, &remote_len)) < 0) {
                        plog(LLV_ERROR, LOCATION, NULL,
                                "failed to receive isakmp packet\n");
                }
                goto end;
        }

        while ((len = recvfromto(so_isakmp, buf->v, buf->l,
                            0, (struct sockaddr *)&remote, &remote_len,
                            (struct sockaddr *)&local, &local_len)) < 0) {
                if (errno == EINTR)
                        continue;
                plog(LLV_ERROR, LOCATION, NULL,
                        "failed to receive isakmp packet\n");
                goto end;
        }

        if (len != buf->l) {
                plog(LLV_ERROR, LOCATION, (struct sockaddr *)&remote,
                        "received invalid length, why ?\n");
                goto end;
        }

        plog(LLV_DEBUG, LOCATION, NULL, "===\n");
        plog(LLV_DEBUG, LOCATION, (struct sockaddr *)&local,
                "%d bytes message received from %s\n",
                len, saddr2str((struct sockaddr *)&remote));
        plogdump(LLV_DEBUG, buf->v, buf->l);

        /* avoid packets with malicious port/address */
        switch (remote.ss_family) {
        case AF_INET:
                port = ((struct sockaddr_in *)&remote)->sin_port;
                break;
#ifdef INET6
        case AF_INET6:
                port = ((struct sockaddr_in6 *)&remote)->sin6_port;
                break;
#endif
        default:
                plog(LLV_ERROR, LOCATION, NULL,
                        "invalid family: %d\n", remote.ss_family);
                goto end;
        }
        if (port == 0) {
                plog(LLV_ERROR, LOCATION, (struct sockaddr *)&remote,
                        "src port == 0 (valid as UDP but not with IKE)\n");
                goto end;
        }

        /* XXX: check sender whether to be allowed or not to accept */

        /* XXX: I don't know how to check isakmp half connection attack. */

        /* simply reply if the packet was processed. */
        if (check_recvdpkt((struct sockaddr *)&remote,
                        (struct sockaddr *)&local, buf)) {
                plog(LLV_NOTIFY, LOCATION, NULL,
                        "the packet is retransmitted by %s.\n",
                        saddr2str((struct sockaddr *)&remote));
                error = 0;
                goto end;
        }

        /* isakmp main routine */
        if (isakmp_main(buf, (struct sockaddr *)&remote,
                        (struct sockaddr *)&local) != 0) goto end;

        error = 0;

end:
        if (buf != NULL)
                vfree(buf);

        return(error);
}

#ifdef IKE_NAT_T
/*
 * isakmp packet handler for natt port (4500)
 */
int
isakmp_natt_handler(so_isakmp)
        int so_isakmp;
{
        u_char  temp_buffer[sizeof(struct isakmp) + 4];
        struct isakmp *isakmp = (struct isakmp*)(temp_buffer + 4);
        struct sockaddr_storage remote;
        struct sockaddr_storage local;
        int remote_len = sizeof(remote);
        int local_len = sizeof(local);
        int len;
        u_short port;
        vchar_t *buf = NULL;
        int error = -1;

        /* read message by MSG_PEEK */
        while ((len = recvfromto(so_isakmp, temp_buffer, sizeof(temp_buffer),
                    MSG_PEEK, (struct sockaddr *)&remote, &remote_len,
                    (struct sockaddr *)&local, &local_len)) < 0) {
                if (errno == EINTR)
                        continue;
                plog(LLV_ERROR, LOCATION, NULL,
                        "failed to receive isakmp packet\n");
                goto end;
        }
        
        /* remove the four bytes of zeros on nat traversal port */
        if (*(u_long*)temp_buffer != 0L)
        {
                /*
                 * This is a UDP encapsulated IPSec packet,
                 * we should drop it.
                 *
                 * TBD: Need a way to read the packet.
                 * The kernel intercepts these packets on Mac OS X
                 * but not all kernels will handle this the same way.
                 */
                goto end;
        }

        /* check isakmp header length */
        if (len < sizeof(temp_buffer)) {
                plog(LLV_ERROR, LOCATION, (struct sockaddr *)&remote,
                        "packet shorter than isakmp header size.\n");
                /* dummy receive */
                if ((len = recvfrom(so_isakmp, (char *)temp_buffer, sizeof(temp_buffer),
                            0, (struct sockaddr *)&remote, &remote_len)) < 0) {
                        plog(LLV_ERROR, LOCATION, NULL,
                                "failed to receive isakmp packet\n");
                }
                goto end;
        }

        /* read real message */
        if ((buf = vmalloc(ntohl(isakmp->len) + 4)) == NULL) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "failed to allocate reading buffer\n");
                /* dummy receive */
                if ((len = recvfrom(so_isakmp, (char *)temp_buffer, sizeof(temp_buffer),
                            0, (struct sockaddr *)&remote, &remote_len)) < 0) {
                        plog(LLV_ERROR, LOCATION, NULL,
                                "failed to receive isakmp packet\n");
                }
                goto end;
        }

        while ((len = recvfromto(so_isakmp, buf->v, buf->l,
                            0, (struct sockaddr *)&remote, &remote_len,
                            (struct sockaddr *)&local, &local_len)) < 0) {
                if (errno == EINTR)
                        continue;
                plog(LLV_ERROR, LOCATION, NULL,
                        "failed to receive isakmp packet\n");
                goto end;
        }

        if (len != buf->l) {
                plog(LLV_ERROR, LOCATION, (struct sockaddr *)&remote,
                        "received invalid length, header says %d, packet is %d bytes why ?\n",
                        len, buf->l);
                goto end;
        }

        /*
         * Discard first 4 bytes, they're either:
         * 0 - this is IKE traffic
         * !0 - first four bytes are the SPI of a UDP encapsulated IPSec packet
         * The seond type of packet should be interecepted by the kernel
         * or dropped before we get to this point.
         */
        {
                vchar_t *newbuf = vmalloc(buf->l - 4);
                if (newbuf == NULL)
                {
                        plog(LLV_ERROR, LOCATION, (struct sockaddr *)&remote,
                                "couldn't allocate smaller buffer.\n");
                        goto end;
                }
                memcpy(newbuf->v, buf->v + 4, newbuf->l);
                vfree(buf);
                buf = newbuf;
                len = buf->l;
        }

        plog(LLV_DEBUG, LOCATION, NULL, "===\n");
        plog(LLV_DEBUG, LOCATION, (struct sockaddr *)&local,
                "%d bytes message received from %s\n",
                len, saddr2str((struct sockaddr *)&remote));
        plogdump(LLV_DEBUG, buf->v, buf->l);

        /* avoid packets with malicious port/address */
        switch (remote.ss_family) {
        case AF_INET:
                port = ((struct sockaddr_in *)&remote)->sin_port;
                break;
#ifdef INET6
        case AF_INET6:
                port = ((struct sockaddr_in6 *)&remote)->sin6_port;
                break;
#endif
        default:
                plog(LLV_ERROR, LOCATION, NULL,
                        "invalid family: %d\n", remote.ss_family);
                goto end;
        }
        if (port == 0) {
                plog(LLV_ERROR, LOCATION, (struct sockaddr *)&remote,
                        "src port == 0 (valid as UDP but not with IKE)\n");
                goto end;
        }

        {
                struct isakmp   *isakmp = (struct isakmp*)buf->v;
                plog(LLV_DEBUG, LOCATION, (struct sockaddr*)&remote,
                        "natt receiving packet %.8X%.8X:%.8X%.8X %u\n",
                        *(u_long*)isakmp->i_ck, *(u_long*)&isakmp->i_ck[4],
                        *(u_long*)isakmp->r_ck, *(u_long*)&isakmp->r_ck[4],
                        isakmp->msgid);
        }

        /* XXX: check sender whether to be allowed or not to accept */

        /* XXX: I don't know how to check isakmp half connection attack. */

        /* simply reply if the packet was processed. */
        if (check_recvdpkt((struct sockaddr *)&remote,
                        (struct sockaddr *)&local, buf)) {
                plog(LLV_NOTIFY, LOCATION, NULL,
                        "the packet is retransmitted by %s.\n",
                        saddr2str((struct sockaddr *)&remote));
                error = 0;
                goto end;
        }

        /* isakmp main routine */
        if (isakmp_main(buf, (struct sockaddr *)&remote,
                        (struct sockaddr *)&local) != 0) goto end;

        error = 0;

end:
        if (buf != NULL)
                vfree(buf);

        return(error);
}
#endif


/*
 * main processing to handle isakmp payload
 */
static int
isakmp_main(msg, remote, local)
        vchar_t *msg;
        struct sockaddr *remote, *local;
{
        struct isakmp *isakmp = (struct isakmp *)msg->v;
        isakmp_index *index = (isakmp_index *)isakmp;
        u_int32_t msgid = isakmp->msgid;
        struct ph1handle *iph1;

#ifdef HAVE_PRINT_ISAKMP_C
        isakmp_printpacket(msg, remote, local, 0);
#endif

        /* the initiator's cookie must not be zero */
        if (memcmp(&isakmp->i_ck, r_ck0, sizeof(cookie_t)) == 0) {
                plog(LLV_ERROR, LOCATION, remote,
                        "malformed cookie received.\n");
                return -1;
        }

        /* Check the Major and Minor Version fields. */
        /*
         * XXX Is is right to check version here ?
         * I think it may no be here because the version depends
         * on exchange status.
         */
        if (isakmp->v < ISAKMP_VERSION_NUMBER) {
                if (ISAKMP_GETMAJORV(isakmp->v) < ISAKMP_MAJOR_VERSION) {
                        plog(LLV_ERROR, LOCATION, remote,
                                "invalid major version %d.\n",
                                ISAKMP_GETMAJORV(isakmp->v));
                        return -1;
                }
#if ISAKMP_MINOR_VERSION > 0
                if (ISAKMP_GETMINORV(isakmp->v) < ISAKMP_MINOR_VERSION) {
                        plog(LLV_ERROR, LOCATION, remote,
                                "invalid minor version %d.\n",
                                ISAKMP_GETMINORV(isakmp->v));
                        return -1;
                }
#endif
        }

        /* check the Flags field. */
        /* XXX How is the exclusive check, E and A ? */
        if (isakmp->flags & ~(ISAKMP_FLAG_E | ISAKMP_FLAG_C | ISAKMP_FLAG_A)) {
                plog(LLV_ERROR, LOCATION, remote,
                        "invalid flag 0x%02x.\n", isakmp->flags);
                return -1;
        }

        /* ignore commit bit. */
        if (ISSET(isakmp->flags, ISAKMP_FLAG_C)) {
                if (isakmp->msgid == 0) {
                        isakmp_info_send_nx(isakmp, remote, local,
                                ISAKMP_NTYPE_INVALID_FLAGS, NULL);
                        plog(LLV_ERROR, LOCATION, remote,
                                "Commit bit on phase1 forbidden.\n");
                        return -1;
                }
        }

        iph1 = getph1byindex(index);
        if (iph1 != NULL) {
                /* validity check */
                if (memcmp(&isakmp->r_ck, r_ck0, sizeof(cookie_t)) == 0 &&
                    iph1->side == INITIATOR) {
                        plog(LLV_DEBUG, LOCATION, remote,
                                "malformed cookie received or "
                                "the initiator's cookies collide.\n");
                        return -1;
                }

                /* must be same addresses in one stream of a phase at least. */
                if (cmpsaddrstrict(iph1->remote, remote) != 0) {
#ifdef IKE_NAT_T
                        if (iph1->side == RESPONDER &&
                                (iph1->natt_flags & natt_remote_support) != 0 &&
                                cmpsaddrwop(iph1->remote, remote) == 0)
                        {
                                /*
                                 * If the initiator detects a NAT it may switch to a
                                 * new port. Technically, the remote address may change
                                 * as well, depending on the NAT. Handling that would
                                 * require more changes.
                                 *
                                 * We should record the new remote port so we can
                                 * send
                                 */
                                 plog(LLV_WARNING, LOCATION, remote,
                                        "remote port changed from %s\n", saddr2str(iph1->remote));
                                 memcpy(iph1->remote, remote, iph1->remote->sa_len);
                                 memcpy(iph1->local, local, iph1->local->sa_len);
                        }
                        else
#endif
                        {
                                char *saddr_db, *saddr_act;
        
                                saddr_db = strdup(saddr2str(iph1->remote));
                                saddr_act = strdup(saddr2str(remote));
        
                                plog(LLV_WARNING, LOCATION, remote,
                                        "remote address mismatched. db=%s, act=%s\n",
                                        saddr_db, saddr_act);
        
                                racoon_free(saddr_db);
                                racoon_free(saddr_act);
                        }
                }
                /*
                 * don't check of exchange type here because other type will be
                 * with same index, for example, informational exchange.
                 */

                /* XXX more acceptable check */
        }

        switch (isakmp->etype) {
        case ISAKMP_ETYPE_IDENT:
        case ISAKMP_ETYPE_AGG:
        case ISAKMP_ETYPE_BASE:
                /* phase 1 validity check */
                if (isakmp->msgid != 0) {
                        plog(LLV_ERROR, LOCATION, remote,
                                "message id should be zero in phase1.\n");
                        return -1;
                }

                /* search for isakmp status record of phase 1 */
                if (iph1 == NULL) {
                        /*
                         * the packet must be the 1st message from a initiator
                         * or the 2nd message from the responder.
                         */

                        /* search for phase1 handle by index without r_ck */
                        iph1 = getph1byindex0(index);
                        if (iph1 == NULL) {
                                /*it must be the 1st message from a initiator.*/
                                if (memcmp(&isakmp->r_ck, r_ck0,
                                        sizeof(cookie_t)) != 0) {

                                        plog(LLV_DEBUG, LOCATION, remote,
                                                "malformed cookie received "
                                                "or the spi expired.\n");
                                        return -1;
                                }

                                /* it must be responder's 1st exchange. */
                                if (isakmp_ph1begin_r(msg, remote, local,
                                        isakmp->etype) < 0)
                                        return -1;
                                break;

                                /*NOTREACHED*/
                        }

                        /* it must be the 2nd message from the responder. */
                        if (iph1->side != INITIATOR) {
                                plog(LLV_DEBUG, LOCATION, remote,
                                        "malformed cookie received. "
                                        "it has to be as the initiator.  %s\n",
                                        isakmp_pindex(&iph1->index, 0));
                                return -1;
                        }
                }

                /*
                 * Don't delete phase 1 handler when the exchange type
                 * in handler is not equal to packet's one because of no
                 * authencication completed.
                 */
                if (iph1->etype != isakmp->etype) {
                        plog(LLV_ERROR, LOCATION, iph1->remote,
                                "exchange type is mismatched: "
                                "db=%s packet=%s, ignore it.\n",
                                s_isakmp_etype(iph1->etype),
                                s_isakmp_etype(isakmp->etype));
                        return -1;
                }

                /* call main process of phase 1 */
                if (ph1_main(iph1, msg) < 0) {
                        plog(LLV_ERROR, LOCATION, iph1->remote,
                                "phase1 negotiation failed.\n");
                        remph1(iph1);
                        delph1(iph1);
                        return -1;
                }
                break;

        case ISAKMP_ETYPE_AUTH:
                plog(LLV_INFO, LOCATION, remote,
                        "unsupported exchange %d received.\n",
                        isakmp->etype);
                break;

        case ISAKMP_ETYPE_INFO:
        case ISAKMP_ETYPE_ACKINFO:
                /*
                 * iph1 must be present for Information message.
                 * if iph1 is null then trying to get the phase1 status
                 * as the packet from responder againt initiator's 1st
                 * exchange in phase 1.
                 * NOTE: We think such informational exchange should be ignored.
                 */
                if (iph1 == NULL) {
                        iph1 = getph1byindex0(index);
                        if (iph1 == NULL) {
                                plog(LLV_ERROR, LOCATION, remote,
                                        "unknown Informational "
                                        "exchange received.\n");
                                return -1;
                        }
                        if (cmpsaddrstrict(iph1->remote, remote) != 0) {
                                plog(LLV_WARNING, LOCATION, remote,
                                        "remote address mismatched. "
                                        "db=%s\n",
                                        saddr2str(iph1->remote));
                        }
                }

                if (isakmp_info_recv(iph1, msg) < 0)
                        return -1;
                break;

        case ISAKMP_ETYPE_QUICK:
        {
                struct ph2handle *iph2;

                if (iph1 == NULL) {
                        isakmp_info_send_nx(isakmp, remote, local,
                                ISAKMP_NTYPE_INVALID_COOKIE, NULL);
                        plog(LLV_ERROR, LOCATION, remote,
                                "can't start the quick mode, "
                                "there is no ISAKMP-SA, %s\n",
                                isakmp_pindex((isakmp_index *)&isakmp->i_ck,
                                        isakmp->msgid));
                        return -1;
                }

                /* check status of phase 1 whether negotiated or not. */
                if (iph1->status != PHASE1ST_ESTABLISHED) {
                        plog(LLV_ERROR, LOCATION, remote,
                                "can't start the quick mode, "
                                "there is no valid ISAKMP-SA, %s\n",
                                isakmp_pindex(&iph1->index, iph1->msgid));
                        return -1;
                }

                /* search isakmp phase 2 stauts record. */
                iph2 = getph2bymsgid(iph1, msgid);
                if (iph2 == NULL) {
                        /* it must be new negotiation as responder */
                        if (isakmp_ph2begin_r(iph1, msg) < 0)
                                return -1;
                        return 0;
                        /*NOTREACHED*/
                }

                /* commit bit. */
                /* XXX
                 * we keep to set commit bit during negotiation.
                 * When SA is configured, bit will be reset.
                 * XXX
                 * don't initiate commit bit.  should be fixed in the future.
                 */
                if (ISSET(isakmp->flags, ISAKMP_FLAG_C))
                        iph2->flags |= ISAKMP_FLAG_C;

                /* call main process of quick mode */
                if (quick_main(iph2, msg) < 0) {
                        plog(LLV_ERROR, LOCATION, iph1->remote,
                                "phase2 negotiation failed.\n");
                        unbindph12(iph2);
                        remph2(iph2);
                        delph2(iph2);
                        return -1;
                }
        }
                break;

        case ISAKMP_ETYPE_NEWGRP:
                if (iph1 == NULL) {
                        plog(LLV_ERROR, LOCATION, remote,
                                "Unknown new group mode exchange, "
                                "there is no ISAKMP-SA.\n");
                        return -1;
                }
                isakmp_newgroup_r(iph1, msg);
                break;

        case ISAKMP_ETYPE_NONE:
        default:
                plog(LLV_ERROR, LOCATION, NULL,
                        "Invalid exchange type %d from %s.\n",
                        isakmp->etype, saddr2str(remote));
                return -1;
        }

        return 0;
}

/*
 * main function of phase 1.
 */
static int
ph1_main(iph1, msg)
        struct ph1handle *iph1;
        vchar_t *msg;
{
        int error;
#ifdef ENABLE_STATS
        struct timeval start, end;
#endif

        /* ignore a packet */
        if (iph1->status == PHASE1ST_ESTABLISHED)
                return 0;

#ifdef ENABLE_STATS
        gettimeofday(&start, NULL);
#endif
        /* receive */
        if (ph1exchange[etypesw1(iph1->etype)]
                       [iph1->side]
                       [iph1->status] == NULL) {
                plog(LLV_ERROR, LOCATION, iph1->remote,
                        "why isn't the function defined.\n");
                return -1;
        }
        error = (ph1exchange[etypesw1(iph1->etype)]
                            [iph1->side]
                            [iph1->status])(iph1, msg);
        if (error != 0) {
#if 0
                /* XXX
                 * When an invalid packet is received on phase1, it should
                 * be selected to process this packet.  That is to respond
                 * with a notify and delete phase 1 handler, OR not to respond
                 * and keep phase 1 handler.
                 */
                plog(LLV_ERROR, LOCATION, iph1->remote,
                        "failed to pre-process packet.\n");
                return -1;
#else
                /* ignore the error and keep phase 1 handler */
                return 0;
#endif
        }

        /* free resend buffer */
        if (iph1->sendbuf == NULL) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "no buffer found as sendbuf\n"); 
                return -1;
        }
        vfree(iph1->sendbuf);
        iph1->sendbuf = NULL;

        /* turn off schedule */
        if (iph1->scr)
                SCHED_KILL(iph1->scr);

        /* send */
        plog(LLV_DEBUG, LOCATION, NULL, "===\n");
        if ((ph1exchange[etypesw1(iph1->etype)]
                        [iph1->side]
                        [iph1->status])(iph1, msg) != 0) {
                plog(LLV_ERROR, LOCATION, iph1->remote,
                        "failed to process packet.\n");
                return -1;
        }

#ifdef ENABLE_STATS
        gettimeofday(&end, NULL);
        syslog(LOG_NOTICE, "%s(%s): %8.6f",
                "phase1", s_isakmp_state(iph1->etype, iph1->side, iph1->status),
                timedelta(&start, &end));
#endif
        if (iph1->status == PHASE1ST_ESTABLISHED) {

#ifdef ENABLE_STATS
                gettimeofday(&iph1->end, NULL);
                syslog(LOG_NOTICE, "%s(%s): %8.6f",
                        "phase1", s_isakmp_etype(iph1->etype),
                        timedelta(&iph1->start, &iph1->end));
#endif

                /* save created date. */
                (void)time(&iph1->created);

                /* add to the schedule to expire, and seve back pointer. */
                iph1->sce = sched_new(iph1->approval->lifetime,
                    isakmp_ph1expire_stub, iph1);

                /* INITIAL-CONTACT processing */
                /* don't anything if local test mode. */
                if (!f_local
                 && iph1->rmconf->ini_contact && !getcontacted(iph1->remote)) {
                        /* send INITIAL-CONTACT */
                        isakmp_info_send_n1(iph1,
                                        ISAKMP_NTYPE_INITIAL_CONTACT, NULL);
                        /* insert a node into contacted list. */
                        if (inscontacted(iph1->remote) == -1) {
                                plog(LLV_ERROR, LOCATION, iph1->remote,
                                        "failed to add contacted list.\n");
                                /* ignore */
                        }
                }

                log_ph1established(iph1);
                plog(LLV_DEBUG, LOCATION, NULL, "===\n");
        }

        return 0;
}

/*
 * main function of quick mode.
 */
static int
quick_main(iph2, msg)
        struct ph2handle *iph2;
        vchar_t *msg;
{
        struct isakmp *isakmp = (struct isakmp *)msg->v;
        int error;
#ifdef ENABLE_STATS
        struct timeval start, end;
#endif

        /* ignore a packet */
        if (iph2->status == PHASE2ST_ESTABLISHED
         || iph2->status == PHASE2ST_GETSPISENT)
                return 0;

#ifdef ENABLE_STATS
        gettimeofday(&start, NULL);
#endif

        /* receive */
        if (ph2exchange[etypesw2(isakmp->etype)]
                       [iph2->side]
                       [iph2->status] == NULL) {
                plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
                        "why isn't the function defined.\n");
                return -1;
        }
        error = (ph2exchange[etypesw2(isakmp->etype)]
                            [iph2->side]
                            [iph2->status])(iph2, msg);
        if (error != 0) {
                plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
                        "failed to pre-process packet.\n");
                if (error == ISAKMP_INTERNAL_ERROR)
                        return 0;
                isakmp_info_send_n1(iph2->ph1, error, NULL);
                return -1;
        }

        /* when using commit bit, status will be reached here. */
        if (iph2->status == PHASE2ST_ADDSA)
                return 0;

        /* free resend buffer */
        if (iph2->sendbuf == NULL) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "no buffer found as sendbuf\n"); 
                return -1;
        }
        vfree(iph2->sendbuf);
        iph2->sendbuf = NULL;

        /* turn off schedule */
        if (iph2->scr)
                SCHED_KILL(iph2->scr);

        /* send */
        plog(LLV_DEBUG, LOCATION, NULL, "===\n");
        if ((ph2exchange[etypesw2(isakmp->etype)]
                        [iph2->side]
                        [iph2->status])(iph2, msg) != 0) {
                plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
                        "failed to process packet.\n");
                return -1;
        }

#ifdef ENABLE_STATS
        gettimeofday(&end, NULL);
        syslog(LOG_NOTICE, "%s(%s): %8.6f",
                "phase2",
                s_isakmp_state(ISAKMP_ETYPE_QUICK, iph2->side, iph2->status),
                timedelta(&start, &end));
#endif

        return 0;
}

/* new negotiation of phase 1 for initiator */
int
isakmp_ph1begin_i(rmconf, remote)
        struct remoteconf *rmconf;
        struct sockaddr *remote;
{
        struct ph1handle *iph1;
#ifdef ENABLE_STATS
        struct timeval start, end;
#endif

        /* get new entry to isakmp status table. */
        iph1 = newph1();
        if (iph1 == NULL)
                return -1;

        iph1->status = PHASE1ST_START;
        iph1->rmconf = rmconf;
        iph1->side = INITIATOR;
        iph1->version = ISAKMP_VERSION_NUMBER;
        iph1->msgid = 0;
        iph1->flags = 0;
        iph1->ph2cnt = 0;
#ifdef HAVE_GSSAPI
        iph1->gssapi_state = NULL;
#endif
        iph1->approval = NULL;

        /* XXX copy remote address */
        if (copy_ph1addresses(iph1, rmconf, remote, NULL) < 0)
                return -1;

        (void)insph1(iph1);

        /* start phase 1 exchange */
        iph1->etype = rmconf->etypes->type;

        plog(LLV_DEBUG, LOCATION, NULL, "===\n");
    {
        char *a;

        a = strdup(saddr2str(iph1->local));
        plog(LLV_INFO, LOCATION, NULL,
                "initiate new phase 1 negotiation: %s<=>%s\n",
                a, saddr2str(iph1->remote));
        racoon_free(a);
    }
        plog(LLV_INFO, LOCATION, NULL,
                "begin %s mode.\n",
                s_isakmp_etype(iph1->etype));

#ifdef ENABLE_STATS
        gettimeofday(&iph1->start, NULL);
        gettimeofday(&start, NULL);
#endif
        /* start exchange */
        if ((ph1exchange[etypesw1(iph1->etype)]
                        [iph1->side]
                        [iph1->status])(iph1, NULL) != 0) {
                /* failed to start phase 1 negotiation */
                remph1(iph1);
                delph1(iph1);

                return -1;
        }

#ifdef ENABLE_STATS
        gettimeofday(&end, NULL);
        syslog(LOG_NOTICE, "%s(%s): %8.6f",
                "phase1",
                s_isakmp_state(iph1->etype, iph1->side, iph1->status),
                timedelta(&start, &end));
#endif

        return 0;
}

/* new negotiation of phase 1 for responder */
static int
isakmp_ph1begin_r(msg, remote, local, etype)
        vchar_t *msg;
        struct sockaddr *remote, *local;
        u_int8_t etype;
{
        struct isakmp *isakmp = (struct isakmp *)msg->v;
        struct remoteconf *rmconf;
        struct ph1handle *iph1;
        struct etypes *etypeok;
#ifdef ENABLE_STATS
        struct timeval start, end;
#endif

        /* look for my configuration */
        rmconf = getrmconf(remote);
        if (rmconf == NULL) {
                plog(LLV_ERROR, LOCATION, remote,
                        "couldn't find "
                        "configuration.\n");
                return -1;
        }

        /* check to be acceptable exchange type */
        etypeok = check_etypeok(rmconf, etype);
        if (etypeok == NULL) {
                plog(LLV_ERROR, LOCATION, remote,
                        "not acceptable %s mode\n", s_isakmp_etype(etype));
                return -1;
        }

        /* get new entry to isakmp status table. */
        iph1 = newph1();
        if (iph1 == NULL)
                return -1;

        memcpy(&iph1->index.i_ck, &isakmp->i_ck, sizeof(iph1->index.i_ck));
        iph1->status = PHASE1ST_START;
        iph1->rmconf = rmconf;
        iph1->flags = 0;
        iph1->side = RESPONDER;
        iph1->etype = etypeok->type;
        iph1->version = isakmp->v;
        iph1->msgid = 0;
#ifdef HAVE_GSSAPI
        iph1->gssapi_state = NULL;
#endif
        iph1->approval = NULL;

        /* copy remote address */
        if (copy_ph1addresses(iph1, rmconf, remote, local) < 0)
                return -1;

        (void)insph1(iph1);

        plog(LLV_DEBUG, LOCATION, NULL, "===\n");
    {
        char *a;

        a = strdup(saddr2str(iph1->local));
        plog(LLV_INFO, LOCATION, NULL,
                "respond new phase 1 negotiation: %s<=>%s\n",
                a, saddr2str(iph1->remote));
        racoon_free(a);
    }
        plog(LLV_INFO, LOCATION, NULL,
                "begin %s mode.\n", s_isakmp_etype(etype));

#ifdef ENABLE_STATS
        gettimeofday(&iph1->start, NULL);
        gettimeofday(&start, NULL);
#endif
        /* start exchange */
        if ((ph1exchange[etypesw1(iph1->etype)]
                        [iph1->side]
                        [iph1->status])(iph1, msg) < 0
         || (ph1exchange[etypesw1(iph1->etype)]
                        [iph1->side]
                        [iph1->status])(iph1, msg) < 0) {
                plog(LLV_ERROR, LOCATION, remote,
                        "failed to process packet.\n");
                remph1(iph1);
                delph1(iph1);
                return -1;
        }
#ifdef ENABLE_STATS
        gettimeofday(&end, NULL);
        syslog(LOG_NOTICE, "%s(%s): %8.6f",
                "phase1",
                s_isakmp_state(iph1->etype, iph1->side, iph1->status),
                timedelta(&start, &end));
#endif

        return 0;
}

/* new negotiation of phase 2 for initiator */
static int
isakmp_ph2begin_i(iph1, iph2)
        struct ph1handle *iph1;
        struct ph2handle *iph2;
{
        /* found ISAKMP-SA. */
        plog(LLV_DEBUG, LOCATION, NULL, "===\n");
        plog(LLV_DEBUG, LOCATION, NULL, "begin QUICK mode.\n");
    {
        char *a;
        a = strdup(saddr2str(iph2->src));
        plog(LLV_INFO, LOCATION, NULL,
                "initiate new phase 2 negotiation: %s<=>%s\n",
                a, saddr2str(iph2->dst));
        racoon_free(a);
    }

#ifdef ENABLE_STATS
        gettimeofday(&iph2->start, NULL);
#endif
        /* found isakmp-sa */
        bindph12(iph1, iph2);
        iph2->status = PHASE2ST_STATUS2;

        if ((ph2exchange[etypesw2(ISAKMP_ETYPE_QUICK)]
                         [iph2->side]
                         [iph2->status])(iph2, NULL) < 0) {
                unbindph12(iph2);
                /* release ipsecsa handler due to internal error. */
                remph2(iph2);
                delph2(iph2);
                return -1;
        }
        return 0;
}

/* new negotiation of phase 2 for responder */
static int
isakmp_ph2begin_r(iph1, msg)
        struct ph1handle *iph1;
        vchar_t *msg;
{
        struct isakmp *isakmp = (struct isakmp *)msg->v;
        struct ph2handle *iph2 = 0;
        int error;
#ifdef ENABLE_STATS
        struct timeval start, end;
#endif

        iph2 = newph2();
        if (iph2 == NULL) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "failed to allocate phase2 entry.\n");
                return -1;
        }

        iph2->ph1 = iph1;
        iph2->side = RESPONDER;
        iph2->status = PHASE2ST_START;
        iph2->flags = isakmp->flags;
        iph2->msgid = isakmp->msgid;
        iph2->seq = pk_getseq();
        iph2->ivm = oakley_newiv2(iph1, iph2->msgid);
        if (iph2->ivm == NULL) {
                delph2(iph2);
                return -1;
        }
        iph2->dst = dupsaddr(iph1->remote);     /* XXX should be considered */
        if (iph2->dst == NULL) {
                delph2(iph2);
                return -1;
        }
        switch (iph2->dst->sa_family) {
        case AF_INET:
                ((struct sockaddr_in *)iph2->dst)->sin_port = 0;
                break;
#ifdef INET6
        case AF_INET6:
                ((struct sockaddr_in6 *)iph2->dst)->sin6_port = 0;
                break;
#endif
        default:
                plog(LLV_ERROR, LOCATION, NULL,
                        "invalid family: %d\n", iph2->dst->sa_family);
                delph2(iph2);
                return -1;
        }

        iph2->src = dupsaddr(iph1->local);      /* XXX should be considered */
        if (iph2->src == NULL) {
                delph2(iph2);
                return -1;
        }
        switch (iph2->src->sa_family) {
        case AF_INET:
                ((struct sockaddr_in *)iph2->src)->sin_port = 0;
                break;
#ifdef INET6
        case AF_INET6:
                ((struct sockaddr_in6 *)iph2->src)->sin6_port = 0;
                break;
#endif
        default:
                plog(LLV_ERROR, LOCATION, NULL,
                        "invalid family: %d\n", iph2->src->sa_family);
                delph2(iph2);
                return -1;
        }

        /* add new entry to isakmp status table */
        insph2(iph2);
        bindph12(iph1, iph2);

        plog(LLV_DEBUG, LOCATION, NULL, "===\n");
    {
        char *a;

        a = strdup(saddr2str(iph2->src));
        plog(LLV_INFO, LOCATION, NULL,
                "respond new phase 2 negotiation: %s<=>%s\n",
                a, saddr2str(iph2->dst));
        racoon_free(a);
    }

#ifdef ENABLE_STATS
        gettimeofday(&start, NULL);
#endif

        error = (ph2exchange[etypesw2(ISAKMP_ETYPE_QUICK)]
                           [iph2->side]
                           [iph2->status])(iph2, msg);
        if (error != 0) {
                plog(LLV_ERROR, LOCATION, iph1->remote,
                        "failed to pre-process packet.\n");
                if (error != ISAKMP_INTERNAL_ERROR)
                        isakmp_info_send_n1(iph2->ph1, error, NULL);
                /*
                 * release handler because it's wrong that ph2handle is kept
                 * after failed to check message for responder's.
                 */
                unbindph12(iph2);
                remph2(iph2);
                delph2(iph2);
                return -1;
        }

        /* send */
        plog(LLV_DEBUG, LOCATION, NULL, "===\n");
        if ((ph2exchange[etypesw2(isakmp->etype)]
                        [iph2->side]
                        [iph2->status])(iph2, msg) < 0) {
                plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
                        "failed to process packet.\n");
                /* don't release handler */
                return -1;
        }
#ifdef ENABLE_STATS
        gettimeofday(&end, NULL);
        syslog(LOG_NOTICE, "%s(%s): %8.6f",
                "phase2",
                s_isakmp_state(ISAKMP_ETYPE_QUICK, iph2->side, iph2->status),
                timedelta(&start, &end));
#endif

        return 0;
}

/*
 * parse ISAKMP payloads, without ISAKMP base header.
 */
vchar_t *
isakmp_parsewoh(np0, gen, len)
        int np0;
        struct isakmp_gen *gen;
        int len;
{
        u_char np = np0 & 0xff;
        int tlen, plen;
        vchar_t *result;
        struct isakmp_parse_t *p, *ep;

        plog(LLV_DEBUG, LOCATION, NULL, "begin.\n");

        /*
         * 5 is a magic number, but any value larger than 2 should be fine
         * as we do vrealloc() in the following loop.
         */
        result = vmalloc(sizeof(struct isakmp_parse_t) * 5);
        if (result == NULL) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "failed to get buffer.\n");
                return NULL;
        }
        p = (struct isakmp_parse_t *)result->v;
        ep = (struct isakmp_parse_t *)(result->v + result->l - sizeof(*ep));

        tlen = len;

        /* parse through general headers */
        while (0 < tlen && np != ISAKMP_NPTYPE_NONE) {
                if (tlen <= sizeof(struct isakmp_gen)) {
                        /* don't send information, see isakmp_ident_r1() */
                        plog(LLV_ERROR, LOCATION, NULL,
                                "invalid length of payload\n");
                        vfree(result);
                        return NULL;
                }

                plog(LLV_DEBUG, LOCATION, NULL,
                        "seen nptype=%u(%s)\n", np, s_isakmp_nptype(np));

                p->type = np;
                p->len = ntohs(gen->len);
                if (p->len == 0 || p->len > tlen) {
                        plog(LLV_DEBUG, LOCATION, NULL,
                                "invalid length of payload\n");
                        vfree(result);
                        return NULL;
                }
                p->ptr = gen;
                p++;
                if (ep <= p) {
                        int off;

                        off = p - (struct isakmp_parse_t *)result->v;
                        result = vrealloc(result, result->l * 2);
                        if (result == NULL) {
                                plog(LLV_DEBUG, LOCATION, NULL,
                                        "failed to realloc buffer.\n");
                                vfree(result);
                                return NULL;
                        }
                        ep = (struct isakmp_parse_t *)
                                (result->v + result->l - sizeof(*ep));
                        p = (struct isakmp_parse_t *)result->v;
                        p += off;
                }

                np = gen->np;
                plen = ntohs(gen->len);
                gen = (struct isakmp_gen *)((caddr_t)gen + plen);
                tlen -= plen;
        }
        p->type = ISAKMP_NPTYPE_NONE;
        p->len = 0;
        p->ptr = NULL;

        plog(LLV_DEBUG, LOCATION, NULL, "succeed.\n");

        return result;
}

/*
 * parse ISAKMP payloads, including ISAKMP base header.
 */
vchar_t *
isakmp_parse(buf)
        vchar_t *buf;
{
        struct isakmp *isakmp = (struct isakmp *)buf->v;
        struct isakmp_gen *gen;
        int tlen;
        vchar_t *result;
        u_char np;

        np = isakmp->np;
        gen = (struct isakmp_gen *)(buf->v + sizeof(*isakmp));
        tlen = buf->l - sizeof(struct isakmp);
        result = isakmp_parsewoh(np, gen, tlen);

        return result;
}

/* %%% */
int
isakmp_init()
{
        /* initialize a isakmp status table */
        initph1tree();
        initph2tree();
        initctdtree();
        init_recvdpkt();

        if (isakmp_open() < 0)
                goto err;

        return(0);

err:
        isakmp_close();
        return(-1);
}

/*
 * make strings containing i_cookie + r_cookie + msgid
 */
const char *
isakmp_pindex(index, msgid)
        const isakmp_index *index;
        const u_int32_t msgid;
{
        static char buf[64];
        const u_char *p;
        int i, j;

        memset(buf, 0, sizeof(buf));

        /* copy index */
        p = (const u_char *)index;
        for (j = 0, i = 0; i < sizeof(isakmp_index); i++) {
                snprintf((char *)&buf[j], sizeof(buf) - j, "%02x", p[i]);
                j += 2;
                switch (i) {
                case 7:
                        buf[j++] = ':';
                }
        }

        if (msgid == 0)
                return buf;

        /* copy msgid */
        snprintf((char *)&buf[j], sizeof(buf) - j, ":%08x", ntohs(msgid));

        return buf;
}

int
isakmp_setup_socket(struct sockaddr* in_addr)
{
        int sock = -1;
        const int yes = 1;
#ifdef INET6
        int pktinfo;
#endif
        if ((sock = socket(in_addr->sa_family, SOCK_DGRAM, 0)) < 0) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "socket (%s)\n", strerror(errno));
                return -1;
        }
        
        /* receive my interface address on inbound packets. */
        switch (in_addr->sa_family) {
                case AF_INET:
                        if (setsockopt(sock, IPPROTO_IP, IP_RECVDSTADDR,
                                (const void *)&yes, sizeof(yes)) < 0) {
                                plog(LLV_ERROR, LOCATION, NULL,
                                "setsockopt (%s)\n", strerror(errno));
                                close(sock);
                                return -1;
                        }
                break;
#ifdef INET6
                case AF_INET6:
#ifdef ADVAPI
#ifdef IPV6_RECVPKTINFO
                        pktinfo = IPV6_RECVPKTINFO;
#else  /* old adv. API */
                        pktinfo = IPV6_PKTINFO;
#endif /* IPV6_RECVPKTINFO */
#else
                        pktinfo = IPV6_RECVDSTADDR;
#endif
                        if (setsockopt(sock, IPPROTO_IPV6, pktinfo,
                                (const void *)&yes, sizeof(yes)) < 0)
                        {
                                plog(LLV_ERROR, LOCATION, NULL,
                                "setsockopt(%d): %s\n",
                                pktinfo, strerror(errno));
                                close(sock);
                                return -1;
                        }
                        break;
#endif
        }
        
#ifdef IPV6_USE_MIN_MTU
        if (in_addr->sa_family == AF_INET6 &&
                setsockopt(sock, IPPROTO_IPV6, IPV6_USE_MIN_MTU,
                (void *)&yes, sizeof(yes)) < 0) {
                plog(LLV_ERROR, LOCATION, NULL,
                "setsockopt (%s)\n", strerror(errno));
                close(sock);
                return -1;
        }
#endif
        
        if (setsockopt_bypass(sock, in_addr->sa_family) < 0) {
                close(sock);
                return -1;
        }
        
        if (bind(sock, in_addr, in_addr->sa_len) < 0) {
                plog(LLV_ERROR, LOCATION, in_addr,
                "failed to bind (%s).\n", strerror(errno));
                close(sock);
                return -1;
        }
        
        return sock;
}

/* open ISAKMP sockets. */
int
isakmp_open()
{
        int ifnum;
        struct myaddrs *p;

        ifnum = 0;
        for (p = lcconf->myaddrs; p; p = p->next) {
                if (!p->addr)
                        continue;

                /* warn if wildcard address - should we forbid this? */
                switch (p->addr->sa_family) {
                case AF_INET:
                        if (((struct sockaddr_in *)p->addr)->sin_addr.s_addr == 0)
                                plog(LLV_WARNING, LOCATION, NULL,
                                        "listening to wildcard address,"
                                        "broadcast IKE packet may kill you\n");
                        break;
#ifdef INET6
                case AF_INET6:
                        if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)p->addr)->sin6_addr))
                                plog(LLV_WARNING, LOCATION, NULL,
                                        "listening to wildcard address, "
                                        "broadcast IKE packet may kill you\n");
                        break;
#endif
                default:
                        plog(LLV_ERROR, LOCATION, NULL,
                                "unsupported address family %d\n",
                                lcconf->default_af);
                        goto err_and_next;
                }
                
                p->sock = isakmp_setup_socket(p->addr);
                if (p->sock < 0) goto err_and_next;

                plog(LLV_DEBUG, LOCATION, NULL,
                        "%s used as isakmp port (fd=%d)\n",
                        saddr2str(p->addr), p->sock);

                ifnum++;
                
#ifdef IKE_NAT_T
                /*
                 * We have to listen on 4500 in addition to 500 with IPv4
                 * to support NAT traversal.
                 */
                if (p->addr->sa_family == AF_INET)
                {
                        struct sockaddr_in      sin = *(struct sockaddr_in*)p->addr;
                        
                        sin.sin_port = ntohs(PORT_ISAKMP_NATT);
                        p->nattsock = isakmp_setup_socket((struct sockaddr*)&sin);
                        if (p->nattsock >= 0)
                        {
                                plog(LLV_DEBUG, LOCATION, NULL,
                                        "%s used as nat-t isakmp port (fd=%d)\n",
                                        saddr2str((struct sockaddr*)&sin), p->nattsock);
                        }
                }
#endif

                continue;

        err_and_next:
                racoon_free(p->addr);
                p->addr = NULL;
                if (! lcconf->autograbaddr && lcconf->strict_address)
                        return -1;
                continue;
        }

        if (!ifnum) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "no address could be bound.\n");
                return -1;
        }

        return 0;
}

void
isakmp_close()
{
        struct myaddrs *p, *next;

        for (p = lcconf->myaddrs; p; p = next) {
                next = p->next;

                if (!p->addr) {
                        racoon_free(p);
                        continue;
                }
                close(p->sock);
#ifdef IKE_NAT_T
                if (p->nattsock >= 0) close(p->nattsock);
#endif
                racoon_free(p->addr);
                racoon_free(p);
        }

        lcconf->myaddrs = NULL;
}

int
isakmp_send(iph1, sbuf)
        struct ph1handle *iph1;
        vchar_t *sbuf;
{
        int len = 0;
        int s;
        vchar_t *newbuf = NULL;

        /* select the socket to be sent */
        s = getsockmyaddr(iph1->local);
        if (s == -1)
                return -1;
        
#ifdef IKE_NAT_T
        /* prepend four bytes of zeros if source or destination port is PORT_ISAKMP_NATT */
        if (iph1->remote->sa_family == AF_INET &&
                (((struct sockaddr_in*)(iph1->remote))->sin_port == htons(PORT_ISAKMP_NATT)) ||
                 ((struct sockaddr_in*)(iph1->local))->sin_port == htons(PORT_ISAKMP_NATT))
        {
                
                /* There's probably a better way to do this */
                newbuf = vmalloc(sbuf->l + 4);
                if (newbuf == NULL) {
                        plog(LLV_ERROR, LOCATION, NULL, "sendfromto natt prepend failed\n");
                        return -1;
                }
                
                memset(newbuf->v, 0, 4);
                memcpy(newbuf->v + 4, sbuf->v, sbuf->l);
                sbuf = newbuf;
        }
#endif

        len = sendfromto(s, sbuf->v, sbuf->l,
                        iph1->local, iph1->remote, lcconf->count_persend);
        if (len == -1) {
                plog(LLV_ERROR, LOCATION, NULL, "sendfromto failed\n");
                return -1;
        }
        
        if (newbuf) vfree(newbuf);

        return 0;
}

/* called from scheduler */
void
isakmp_ph1resend_stub(p)
        void *p;
{
        (void)isakmp_ph1resend((struct ph1handle *)p);
}

int
isakmp_ph1resend(iph1)
        struct ph1handle *iph1;
{
        if (iph1->retry_counter < 0) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "phase1 negotiation failed due to time up. %s\n",
                        isakmp_pindex(&iph1->index, iph1->msgid));

                remph1(iph1);
                delph1(iph1);
                return -1;
        }

        if (isakmp_send(iph1, iph1->sendbuf) < 0)
                return -1;

        plog(LLV_DEBUG, LOCATION, NULL,
                "resend phase1 packet %s\n",
                isakmp_pindex(&iph1->index, iph1->msgid));

        iph1->retry_counter--;

        iph1->scr = sched_new(iph1->rmconf->retry_interval,
                isakmp_ph1resend_stub, iph1);

        return 0;
}

/* called from scheduler */
void
isakmp_ph2resend_stub(p)
        void *p;
{

        (void)isakmp_ph2resend((struct ph2handle *)p);
}

int
isakmp_ph2resend(iph2)
        struct ph2handle *iph2;
{
        if (iph2->retry_counter < 0) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "phase2 negotiation failed due to time up. %s\n",
                                isakmp_pindex(&iph2->ph1->index, iph2->msgid));
                unbindph12(iph2);
                remph2(iph2);
                delph2(iph2);
                return -1;
        }

        if (isakmp_send(iph2->ph1, iph2->sendbuf) < 0)
                return -1;

        plog(LLV_DEBUG, LOCATION, NULL,
                "resend phase2 packet %s\n",
                isakmp_pindex(&iph2->ph1->index, iph2->msgid));

        iph2->retry_counter--;

        iph2->scr = sched_new(iph2->ph1->rmconf->retry_interval,
                isakmp_ph2resend_stub, iph2);

        return 0;
}

/* called from scheduler */
void
isakmp_ph1expire_stub(p)
        void *p;
{

        isakmp_ph1expire((struct ph1handle *)p);
}

void
isakmp_ph1expire(iph1)
        struct ph1handle *iph1;
{
        char *src, *dst;

        src = strdup(saddr2str(iph1->local));
        dst = strdup(saddr2str(iph1->remote));
        plog(LLV_INFO, LOCATION, NULL,
                "ISAKMP-SA expired %s-%s spi:%s\n",
                src, dst,
                isakmp_pindex(&iph1->index, 0));
        racoon_free(src);
        racoon_free(dst);

        SCHED_KILL(iph1->sce);

        iph1->status = PHASE1ST_EXPIRED;

        /*
         * the phase1 deletion is postponed until there is no phase2.
         */
        if (LIST_FIRST(&iph1->ph2tree) != NULL) {
                iph1->sce = sched_new(1, isakmp_ph1expire_stub, iph1);
                return;
        }

        iph1->sce = sched_new(1, isakmp_ph1delete_stub, iph1);
}

/* called from scheduler */
void
isakmp_ph1delete_stub(p)
        void *p;
{

        isakmp_ph1delete((struct ph1handle *)p);
}

void
isakmp_ph1delete(iph1)
        struct ph1handle *iph1;
{
        char *src, *dst;

        SCHED_KILL(iph1->sce);

        if (LIST_FIRST(&iph1->ph2tree) != NULL) {
                iph1->sce = sched_new(1, isakmp_ph1delete_stub, iph1);
                return;
        }

        /* don't re-negosiation when the phase 1 SA expires. */

        src = strdup(saddr2str(iph1->local));
        dst = strdup(saddr2str(iph1->remote));
        plog(LLV_INFO, LOCATION, NULL,
                "ISAKMP-SA deleted %s-%s spi:%s\n",
                src, dst, isakmp_pindex(&iph1->index, 0));
        racoon_free(src);
        racoon_free(dst);

        remph1(iph1);
        delph1(iph1);

        return;
}

/* called from scheduler.
 * this function will call only isakmp_ph2delete().
 * phase 2 handler remain forever if kernel doesn't cry a expire of phase 2 SA
 * by something cause.  That's why this function is called after phase 2 SA
 * expires in the userland.
 */
void
isakmp_ph2expire_stub(p)
        void *p;
{

        isakmp_ph2expire((struct ph2handle *)p);
}

void
isakmp_ph2expire(iph2)
        struct ph2handle *iph2;
{
        char *src, *dst;

        SCHED_KILL(iph2->sce);

        src = strdup(saddrwop2str(iph2->src));
        dst = strdup(saddrwop2str(iph2->dst));
        plog(LLV_INFO, LOCATION, NULL,
                "phase2 sa expired %s-%s\n", src, dst);
        racoon_free(src);
        racoon_free(dst);

        iph2->status = PHASE2ST_EXPIRED;

        iph2->sce = sched_new(1, isakmp_ph2delete_stub, iph2);

        return;
}

/* called from scheduler */
void
isakmp_ph2delete_stub(p)
        void *p;
{

        isakmp_ph2delete((struct ph2handle *)p);
}

void
isakmp_ph2delete(iph2)
        struct ph2handle *iph2;
{
        char *src, *dst;

        SCHED_KILL(iph2->sce);

        src = strdup(saddrwop2str(iph2->src));
        dst = strdup(saddrwop2str(iph2->dst));
        plog(LLV_INFO, LOCATION, NULL,
                "phase2 sa deleted %s-%s\n", src, dst);
        racoon_free(src);
        racoon_free(dst);

        unbindph12(iph2);
        remph2(iph2);
        delph2(iph2);

        return;
}

/* \f%%%
 * Interface between PF_KEYv2 and ISAKMP
 */
/*
 * receive ACQUIRE from kernel, and begin either phase1 or phase2.
 * if phase1 has been finished, begin phase2.
 */
int
isakmp_post_acquire(iph2)
        struct ph2handle *iph2;
{
        struct remoteconf *rmconf;
        struct ph1handle *iph1 = NULL;

        /* search appropreate configuration with masking port. */
        rmconf = getrmconf(iph2->dst);
        if (rmconf == NULL) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "no configuration found for %s.\n",
                        saddrwop2str(iph2->dst));
                return -1;
        }

        /* if passive mode, ignore the acquire message */
        if (rmconf->passive) {
                plog(LLV_DEBUG, LOCATION, NULL,
                        "because of passive mode, "
                        "ignore the acquire message for %s.\n",
                        saddrwop2str(iph2->dst));
                return 0;
        }

        /* search isakmp status table by address with masking port */
        iph1 = getph1byaddr(iph2->src, iph2->dst);

        /* no ISAKMP-SA found. */
        if (iph1 == NULL) {
                struct sched *sc;

                iph2->retry_checkph1 = lcconf->retry_checkph1;
                sc = sched_new(1, isakmp_chkph1there_stub, iph2);
                plog(LLV_INFO, LOCATION, NULL,
                        "IPsec-SA request for %s queued "
                        "due to no phase1 found.\n",
                        saddrwop2str(iph2->dst));

                /* start phase 1 negotiation as a initiator. */
                if (isakmp_ph1begin_i(rmconf, iph2->dst) < 0) {
                        SCHED_KILL(sc);
                        return -1;
                }

                return 0;
                /*NOTREACHED*/
        }

        /* found ISAKMP-SA, but on negotiation. */
        if (iph1->status != PHASE1ST_ESTABLISHED) {
                iph2->retry_checkph1 = lcconf->retry_checkph1;
                sched_new(1, isakmp_chkph1there_stub, iph2);
                plog(LLV_INFO, LOCATION, iph2->dst,
                        "request for establishing IPsec-SA was queued "
                        "due to no phase1 found.\n");
                return 0;
                /*NOTREACHED*/
        }

        /* found established ISAKMP-SA */
        /* i.e. iph1->status == PHASE1ST_ESTABLISHED */

        /* found ISAKMP-SA. */
        plog(LLV_DEBUG, LOCATION, NULL, "begin QUICK mode.\n");

        /* begin quick mode */
        if (isakmp_ph2begin_i(iph1, iph2))
                return -1;

        return 0;
}

/*
 * receive GETSPI from kernel.
 */
int
isakmp_post_getspi(iph2)
        struct ph2handle *iph2;
{
#ifdef ENABLE_STATS
        struct timeval start, end;
#endif

        /* don't process it because there is no suitable phase1-sa. */
        if (iph2->ph1->status == PHASE2ST_EXPIRED) {
                plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
                        "the negotiation is stopped, "
                        "because there is no suitable ISAKMP-SA.\n");
                return -1;
        }

#ifdef ENABLE_STATS
        gettimeofday(&start, NULL);
#endif
        if ((ph2exchange[etypesw2(ISAKMP_ETYPE_QUICK)]
                        [iph2->side]
                        [iph2->status])(iph2, NULL) != 0)
                return -1;
#ifdef ENABLE_STATS
        gettimeofday(&end, NULL);
        syslog(LOG_NOTICE, "%s(%s): %8.6f",
                "phase2",
                s_isakmp_state(ISAKMP_ETYPE_QUICK, iph2->side, iph2->status),
                timedelta(&start, &end));
#endif

        return 0;
}

/* called by scheduler */
void
isakmp_chkph1there_stub(p)
        void *p;
{
        isakmp_chkph1there((struct ph2handle *)p);
}

void
isakmp_chkph1there(iph2)
        struct ph2handle *iph2;
{
        struct ph1handle *iph1;

        iph2->retry_checkph1--;
        if (iph2->retry_checkph1 < 0) {
                plog(LLV_ERROR, LOCATION, iph2->dst,
                        "phase2 negotiation failed "
                        "due to time up waiting for phase1. %s\n",
                        sadbsecas2str(iph2->dst, iph2->src,
                                iph2->satype, 0, 0));
                plog(LLV_INFO, LOCATION, NULL,
                        "delete phase 2 handler.\n");

                /* send acquire to kernel as error */
                pk_sendeacquire(iph2);

                unbindph12(iph2);
                remph2(iph2);
                delph2(iph2);

                return;
        }

        iph1 = getph1byaddr(iph2->src, iph2->dst);

        /* XXX Even if ph1 as responder is there, should we not start
         * phase 2 negotiation ? */
        if (iph1 != NULL
         && iph1->status == PHASE1ST_ESTABLISHED) {
                /* found isakmp-sa */
                /* begin quick mode */
                (void)isakmp_ph2begin_i(iph1, iph2);
                return;
        }

        /* no isakmp-sa found */
        sched_new(1, isakmp_chkph1there_stub, iph2);

        return;
}

/* copy variable data into ALLOCATED buffer. */
caddr_t
isakmp_set_attr_v(buf, type, val, len)
        caddr_t buf;
        int type;
        caddr_t val;
        int len;
{
        struct isakmp_data *data;

        data = (struct isakmp_data *)buf;
        data->type = htons((u_int16_t)type | ISAKMP_GEN_TLV);
        data->lorv = htons((u_int16_t)len);
        memcpy(data + 1, val, len);

        return buf + sizeof(*data) + len;
}

/* copy fixed length data into ALLOCATED buffer. */
caddr_t
isakmp_set_attr_l(buf, type, val)
        caddr_t buf;
        int type;
        u_int32_t val;
{
        struct isakmp_data *data;

        data = (struct isakmp_data *)buf;
        data->type = htons((u_int16_t)type | ISAKMP_GEN_TV);
        data->lorv = htons((u_int16_t)val);

        return buf + sizeof(*data);
}

/* add a variable data attribute to the buffer by reallocating it. */
vchar_t *
isakmp_add_attr_v(buf0, type, val, len)
        vchar_t *buf0;
        int type;
        caddr_t val;
        int len;
{
        vchar_t *buf = NULL;
        struct isakmp_data *data;
        int tlen;
        int oldlen = 0;

        tlen = sizeof(*data) + len;

        if (buf0) {
                oldlen = buf0->l;
                buf = vrealloc(buf0, oldlen + tlen);
        } else
                buf = vmalloc(tlen);
        if (!buf) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "failed to get a attribute buffer.\n");
                return NULL;
        }

        data = (struct isakmp_data *)(buf->v + oldlen);
        data->type = htons((u_int16_t)type | ISAKMP_GEN_TLV);
        data->lorv = htons((u_int16_t)len);
        memcpy(data + 1, val, len);

        return buf;
}

/* add a fixed data attribute to the buffer by reallocating it. */
vchar_t *
isakmp_add_attr_l(buf0, type, val)
        vchar_t *buf0;
        int type;
        u_int32_t val;
{
        vchar_t *buf = NULL;
        struct isakmp_data *data;
        int tlen;
        int oldlen = 0;

        tlen = sizeof(*data);

        if (buf0) {
                oldlen = buf0->l;
                buf = vrealloc(buf0, oldlen + tlen);
        } else
                buf = vmalloc(tlen);
        if (!buf) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "failed to get a attribute buffer.\n");
                return NULL;
        }

        data = (struct isakmp_data *)(buf->v + oldlen);
        data->type = htons((u_int16_t)type | ISAKMP_GEN_TV);
        data->lorv = htons((u_int16_t)val);

        return buf;
}

/*
 * calculate cookie and set.
 */
int
isakmp_newcookie(place, remote, local)
        caddr_t place;
        struct sockaddr *remote;
        struct sockaddr *local;
{
        vchar_t *buf = NULL, *buf2 = NULL;
        char *p;
        int blen;
        int alen;
        caddr_t sa1, sa2;
        time_t t;
        int error = -1;
        u_short port;


        if (remote->sa_family != local->sa_family) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "address family mismatch, remote:%d local:%d\n",
                        remote->sa_family, local->sa_family);
                goto end;
        }
        switch (remote->sa_family) {
        case AF_INET:
                alen = sizeof(struct in_addr);
                sa1 = (caddr_t)&((struct sockaddr_in *)remote)->sin_addr;
                sa2 = (caddr_t)&((struct sockaddr_in *)local)->sin_addr;
                break;
#ifdef INET6
        case AF_INET6:
                alen = sizeof(struct in_addr);
                sa1 = (caddr_t)&((struct sockaddr_in6 *)remote)->sin6_addr;
                sa2 = (caddr_t)&((struct sockaddr_in6 *)local)->sin6_addr;
                break;
#endif
        default:
                plog(LLV_ERROR, LOCATION, NULL,
                        "invalid family: %d\n", remote->sa_family);
                goto end;
        }
        blen = (alen + sizeof(u_short)) * 2
                + sizeof(time_t) + lcconf->secret_size;
        buf = vmalloc(blen);
        if (buf == NULL) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "failed to get a cookie.\n");
                goto end;
        }
        p = buf->v;

        /* copy my address */
        memcpy(p, sa1, alen);
        p += alen;
        port = ((struct sockaddr_in *)remote)->sin_port;
        memcpy(p, &port, sizeof(u_short));
        p += sizeof(u_short);

        /* copy target address */
        memcpy(p, sa2, alen);
        p += alen;
        port = ((struct sockaddr_in *)local)->sin_port;
        memcpy(p, &port, sizeof(u_short));
        p += sizeof(u_short);

        /* copy time */
        t = time(0);
        memcpy(p, (caddr_t)&t, sizeof(t));
        p += sizeof(t);

        /* copy random value */
        buf2 = eay_set_random(lcconf->secret_size);
        if (buf2 == NULL)
                goto end;
        memcpy(p, buf2->v, lcconf->secret_size);
        p += lcconf->secret_size;
        vfree(buf2);

        buf2 = eay_sha1_one(buf);
        memcpy(place, buf2->v, sizeof(cookie_t));

        sa1 = val2str(place, sizeof (cookie_t));
        plog(LLV_DEBUG, LOCATION, NULL, "new cookie:\n%s\n", sa1);
        racoon_free(sa1);

        error = 0;
end:
        if (buf != NULL)
                vfree(buf);
        if (buf2 != NULL)
                vfree(buf2);
        return error;
}

/*
 * save partner's(payload) data into phhandle.
 */
int
isakmp_p2ph(buf, gen)
        vchar_t **buf;
        struct isakmp_gen *gen;
{
        /* XXX to be checked in each functions for logging. */
        if (*buf) {
                plog(LLV_WARNING, LOCATION, NULL,
                        "ignore this payload, same payload type exist.\n");
                return -1;
        }

        *buf = vmalloc(ntohs(gen->len) - sizeof(*gen));
        if (*buf == NULL) {
                plog(LLV_ERROR, LOCATION, NULL,
                        "failed to get buffer.\n");
                return -1;
        }
        memcpy((*buf)->v, gen + 1, (*buf)->l);

        return 0;
}

u_int32_t
isakmp_newmsgid2(iph1)
        struct ph1handle *iph1;
{
        u_int32_t msgid2;

        do {
                msgid2 = arc4random();
        } while (getph2bymsgid(iph1, msgid2));

        return msgid2;
}

/*
 * set values into allocated buffer of isakmp header for phase 1
 */
caddr_t
set_isakmp_header(vbuf, iph1, nptype)
        vchar_t *vbuf;
        struct ph1handle *iph1;
        int nptype;
{
        struct isakmp *isakmp;

        if (vbuf->l < sizeof(*isakmp))
                return NULL;

        isakmp = (struct isakmp *)vbuf->v;
        memcpy(&isakmp->i_ck, &iph1->index.i_ck, sizeof(cookie_t));
        memcpy(&isakmp->r_ck, &iph1->index.r_ck, sizeof(cookie_t));
        isakmp->np = nptype;
        isakmp->v = iph1->version;
        isakmp->etype = iph1->etype;
        isakmp->flags = iph1->flags;
        isakmp->msgid = iph1->msgid;
        isakmp->len = htonl(vbuf->l);

        return vbuf->v + sizeof(*isakmp);
}

/*
 * set values into allocated buffer of isakmp header for phase 2
 */
caddr_t
set_isakmp_header2(vbuf, iph2, nptype)
        vchar_t *vbuf;
        struct ph2handle *iph2;
        int nptype;
{
        struct isakmp *isakmp;

        if (vbuf->l < sizeof(*isakmp))
                return NULL;

        isakmp = (struct isakmp *)vbuf->v;
        memcpy(&isakmp->i_ck, &iph2->ph1->index.i_ck, sizeof(cookie_t));
        memcpy(&isakmp->r_ck, &iph2->ph1->index.r_ck, sizeof(cookie_t));
        isakmp->np = nptype;
        isakmp->v = iph2->ph1->version;
        isakmp->etype = ISAKMP_ETYPE_QUICK;
        isakmp->flags = iph2->flags;
        memcpy(&isakmp->msgid, &iph2->msgid, sizeof(isakmp->msgid));
        isakmp->len = htonl(vbuf->l);

        return vbuf->v + sizeof(*isakmp);
}

/*
 * set values into allocated buffer of isakmp payload.
 */
caddr_t
set_isakmp_payload(buf, src, nptype)
        caddr_t buf;
        vchar_t *src;
        int nptype;
{
        struct isakmp_gen *gen;
        caddr_t p = buf;

        plog(LLV_DEBUG, LOCATION, NULL, "add payload of len %d, next type %d\n",
            src->l, nptype);

        gen = (struct isakmp_gen *)p;
        gen->np = nptype;
        gen->len = htons(sizeof(*gen) + src->l);
        p += sizeof(*gen);
        memcpy(p, src->v, src->l);
        p += src->l;

        return p;
}

static int
etypesw1(etype)
        int etype;
{
        switch (etype) {
        case ISAKMP_ETYPE_IDENT:
                return 1;
        case ISAKMP_ETYPE_AGG:
                return 2;
        case ISAKMP_ETYPE_BASE:
                return 3;
        default:
                return 0;
        }
        /*NOTREACHED*/
}

static int
etypesw2(etype)
        int etype;
{
        switch (etype) {
        case ISAKMP_ETYPE_QUICK:
                return 1;
        default:
                return 0;
        }
        /*NOTREACHED*/
}

#ifdef HAVE_PRINT_ISAKMP_C
/* for print-isakmp.c */
char *snapend;
extern void isakmp_print __P((const u_char *, u_int, const u_char *));

char *getname __P((const u_char *));
#ifdef INET6
char *getname6 __P((const u_char *));
#endif
int safeputchar __P((int));

/*
 * Return a name for the IP address pointed to by ap.  This address
 * is assumed to be in network byte order.
 */
char *
getname(ap)
        const u_char *ap;
{
        struct sockaddr_in addr;
        static char ntop_buf[NI_MAXHOST];

        memset(&addr, 0, sizeof(addr));
        addr.sin_len = sizeof(struct sockaddr_in);
        addr.sin_family = AF_INET;
        memcpy(&addr.sin_addr, ap, sizeof(addr.sin_addr));
        if (getnameinfo((struct sockaddr *)&addr, addr.sin_len,
                        ntop_buf, sizeof(ntop_buf), NULL, 0,
                        NI_NUMERICHOST | niflags))
                strlcpy(ntop_buf, "?", sizeof(ntop_buf));

        return ntop_buf;
}

#ifdef INET6
/*
 * Return a name for the IP6 address pointed to by ap.  This address
 * is assumed to be in network byte order.
 */
char *
getname6(ap)
        const u_char *ap;
{
        struct sockaddr_in6 addr;
        static char ntop_buf[NI_MAXHOST];

        memset(&addr, 0, sizeof(addr));
        addr.sin6_len = sizeof(struct sockaddr_in6);
        addr.sin6_family = AF_INET6;
        memcpy(&addr.sin6_addr, ap, sizeof(addr.sin6_addr));
        if (getnameinfo((struct sockaddr *)&addr, addr.sin6_len,
                        ntop_buf, sizeof(ntop_buf), NULL, 0,
                        NI_NUMERICHOST | niflags))
                strlcpy(ntop_buf, "?", sizeof(ntop_buf));

        return ntop_buf;
}
#endif /* INET6 */

int
safeputchar(c)
        int c;
{
        unsigned char ch;

        ch = (unsigned char)(c & 0xff);
        if (c < 0x80 && isprint(c))
                return printf("%c", c & 0xff);
        else
                return printf("\\%03o", c & 0xff);
}

void
isakmp_printpacket(msg, from, my, decoded)
        vchar_t *msg;
        struct sockaddr *from;
        struct sockaddr *my;
        int decoded;
{
#ifdef YIPS_DEBUG
        struct timeval tv;
        int s;
        char hostbuf[NI_MAXHOST];
        char portbuf[NI_MAXSERV];
        struct isakmp *isakmp;
        vchar_t *buf;
#endif

        if (loglevel < LLV_DEBUG)
                return;

#ifdef YIPS_DEBUG
        plog(LLV_DEBUG, LOCATION, NULL, "begin.\n");

        gettimeofday(&tv, NULL);
        s = tv.tv_sec % 3600;
        printf("%02d:%02d.%06u ", s / 60, s % 60, (u_int32_t)tv.tv_usec);

        if (from) {
                if (getnameinfo(from, from->sa_len, hostbuf, sizeof(hostbuf),
                                portbuf, sizeof(portbuf),
                                NI_NUMERICHOST | NI_NUMERICSERV | niflags)) {
                        strlcpy(hostbuf, "?", sizeof(hostbuf));
                        strlcpy(portbuf, "?", sizeof(portbuf));
                }
                printf("%s:%s", hostbuf, portbuf);
        } else
                printf("?");
        printf(" -> ");
        if (my) {
                if (getnameinfo(my, my->sa_len, hostbuf, sizeof(hostbuf),
                                portbuf, sizeof(portbuf),
                                NI_NUMERICHOST | NI_NUMERICSERV | niflags)) {
                        strlcpy(hostbuf, "?", sizeof(hostbuf));
                        strlcpy(portbuf, "?", sizeof(portbuf));
                }
                printf("%s:%s", hostbuf, portbuf);
        } else
                printf("?");
        printf(": ");

        buf = vdup(msg);
        if (!buf) {
                printf("(malloc fail)\n");
                return;
        }
        if (decoded) {
                isakmp = (struct isakmp *)buf->v;
                if (isakmp->flags & ISAKMP_FLAG_E) {
#if 0
                        int pad;
                        pad = *(u_char *)(buf->v + buf->l - 1);
                        if (buf->l < pad && 2 < vflag)
                                printf("(wrong padding)");
#endif
                        isakmp->flags &= ~ISAKMP_FLAG_E;
                }
        }

        snapend = buf->v + buf->l;
        isakmp_print(buf->v, buf->l, NULL);
        vfree(buf);
        printf("\n");
        fflush(stdout);

        return;
#endif
}
#endif /*HAVE_PRINT_ISAKMP_C*/

int
copy_ph1addresses(iph1, rmconf, remote, local)
        struct ph1handle *iph1;
        struct remoteconf *rmconf;
        struct sockaddr *remote, *local;
{
        u_short *port = NULL;

        /* address portion must be grabbed from real remote address "remote" */
        iph1->remote = dupsaddr(remote);
        if (iph1->remote == NULL) {
                delph1(iph1);
                return -1;
        }

        /*
         * if remote has no port # (in case of initiator - from ACQUIRE msg)
         * - if remote.conf specifies port #, use that
         * - if remote.conf does not, use 500
         * if remote has port # (in case of responder - from recvfrom(2))
         * respect content of "remote".
         */
        switch (iph1->remote->sa_family) {
        case AF_INET:
                port = &((struct sockaddr_in *)iph1->remote)->sin_port;
                if (*port)
                        break;
                *port = ((struct sockaddr_in *)rmconf->remote)->sin_port;
                if (*port)
                        break;
                *port = htons(PORT_ISAKMP);
                break;
#ifdef INET6
        case AF_INET6:
                port = &((struct sockaddr_in6 *)iph1->remote)->sin6_port;
                if (*port)
                        break;
                *port = ((struct sockaddr_in6 *)rmconf->remote)->sin6_port;
                if (*port)
                        break;
                *port = htons(PORT_ISAKMP);
                break;
#endif
        default:
                plog(LLV_ERROR, LOCATION, NULL,
                        "invalid family: %d\n", iph1->remote->sa_family);
                return -1;
        }

        if (local == NULL)
                iph1->local = getlocaladdr(iph1->remote);
        else
                iph1->local = dupsaddr(local);
        if (iph1->local == NULL) {
                delph1(iph1);
                return -1;
        }
        switch (iph1->local->sa_family) {
        case AF_INET:
                ((struct sockaddr_in *)iph1->local)->sin_port
                        = getmyaddrsport(iph1->local);
                break;
#ifdef INET6
        case AF_INET6:
                ((struct sockaddr_in6 *)iph1->local)->sin6_port
                        = getmyaddrsport(iph1->local);
                break;
#endif
        default:
                plog(LLV_ERROR, LOCATION, NULL,
                        "invalid family: %d\n", iph1->remote->sa_family);
                delph1(iph1);
                return -1;
        }

        return 0;
}

static int
nostate1(iph1, msg)
        struct ph1handle *iph1;
        vchar_t *msg;
{
        plog(LLV_ERROR, LOCATION, iph1->remote, "wrong state %u.\n",
                        iph1->status);
        return -1;
}

static int
nostate2(iph2, msg)
        struct ph2handle *iph2;
        vchar_t *msg;
{
        plog(LLV_ERROR, LOCATION, iph2->ph1->remote, "wrong state %u.\n",
                iph2->status);
        return -1;
}

void
log_ph1established(iph1)
        const struct ph1handle *iph1;
{
        char *src, *dst;

        src = strdup(saddr2str(iph1->local));
        dst = strdup(saddr2str(iph1->remote));
        plog(LLV_INFO, LOCATION, NULL,
                "ISAKMP-SA established %s-%s spi:%s\n",
                src, dst,
                isakmp_pindex(&iph1->index, 0));
        racoon_free(src);
        racoon_free(dst);

        return;
}