/*      $NetBSD: ipsec_dump_policy.c,v 1.13 2025/03/10 15:59:04 christos Exp $  */

/* Id: ipsec_dump_policy.c,v 1.10 2005/06/29 09:12:37 manubsd Exp */

/*
 * 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

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

#include <netinet/in.h>
#include PATH_IPSEC_H

#include <arpa/inet.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>

#include "ipsec_strerror.h"
#include "libpfkey.h"

static const char *ipsp_dir_strs[] = {
        "any", "in", "out", "fwd",
#ifdef __linux__
        "in(socket)", "out(socket)"
#endif
};

static const char *ipsp_policy_strs[] = {
        "discard", "none", "ipsec", "entrust", "bypass",
};

static char *ipsec_dump_ipsecrequest(char *, size_t,
        const struct sadb_x_ipsecrequest *, size_t, int);
static char *ipsec_dump_policy1(const void *, const char *, int);
static int set_addresses(char *, size_t, const struct sockaddr *,
        const struct sockaddr *, int);
static char *set_address(char *, size_t, const struct sockaddr *, int);

/*
 * policy is sadb_x_policy buffer.
 * Must call free() later.
 * When delimiter == NULL, alternatively ' '(space) is applied.
 */
char *
ipsec_dump_policy(ipsec_policy_t policy, __ipsec_const char *delimiter)
{
        return ipsec_dump_policy1(policy, delimiter, 0);
}

char *
ipsec_dump_policy_withports(void *policy, const char *delimiter)
{
        return ipsec_dump_policy1(policy, delimiter, 1);
}

static char *
ipsec_dump_policy1(const void *policy, const char *delimiter, int withports)
{
        const struct sadb_x_policy *xpl = policy;
        const struct sadb_x_ipsecrequest *xisr;
        size_t off, buflen, extlen;
        char *buf;
        char isrbuf[4096];
        char *newbuf;

#ifdef HAVE_PFKEY_POLICY_PRIORITY
        int32_t priority_offset;
        char *priority_str;
        char operator;
#endif

        /* sanity check */
        if (policy == NULL)
                return NULL;
        if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
                __ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
                return NULL;
        }

        /* set delimiter */
        if (delimiter == NULL)
                delimiter = " ";

#ifdef HAVE_PFKEY_POLICY_PRIORITY
        if (xpl->sadb_x_policy_priority == 0)
        {
                priority_offset = 0;
                priority_str = "";
        }
        /* find which constant the priority is closest to */
        else if (xpl->sadb_x_policy_priority < 
                 (u_int32_t) (PRIORITY_DEFAULT / 4) * 3)
        {
                priority_offset = xpl->sadb_x_policy_priority - PRIORITY_HIGH;
                priority_str = "prio high";
        }
        else if (xpl->sadb_x_policy_priority >= 
                 (u_int32_t) (PRIORITY_DEFAULT / 4) * 3 &&
                 xpl->sadb_x_policy_priority < 
                 (u_int32_t) (PRIORITY_DEFAULT / 4) * 5)
        {
                priority_offset = xpl->sadb_x_policy_priority - PRIORITY_DEFAULT;
                priority_str = "prio def";
        }
        else
        {
                priority_offset = xpl->sadb_x_policy_priority - PRIORITY_LOW;
                priority_str = "prio low";
        }

        /* fix sign to match the way it is input */
        priority_offset *= -1;
        if (priority_offset < 0)
        {
                operator = '-';
                priority_offset *= -1;
        }
        else
        {
                operator = '+';
        }
#endif
        
        switch (xpl->sadb_x_policy_dir) {
        case IPSEC_DIR_ANY:
        case IPSEC_DIR_INBOUND:
        case IPSEC_DIR_OUTBOUND:
#ifdef HAVE_POLICY_FWD
        case IPSEC_DIR_FWD:
        case IPSEC_DIR_FWD + 1:
        case IPSEC_DIR_FWD + 2:
#endif
                break;
        default:
                __ipsec_errcode = EIPSEC_INVAL_DIR;
                return NULL;
        }

        switch (xpl->sadb_x_policy_type) {
        case IPSEC_POLICY_DISCARD:
        case IPSEC_POLICY_NONE:
        case IPSEC_POLICY_IPSEC:
        case IPSEC_POLICY_BYPASS:
        case IPSEC_POLICY_ENTRUST:
                break;
        default:
                __ipsec_errcode = EIPSEC_INVAL_POLICY;
                return NULL;
        }

        buflen = strlen(ipsp_dir_strs[xpl->sadb_x_policy_dir])
                + 1     /* space */
#ifdef HAVE_PFKEY_POLICY_PRIORITY
                + strlen(priority_str)
                + ((priority_offset != 0) ? 13 : 0) /* [space operator space int] */
                + ((strlen(priority_str) != 0) ? 1 : 0) /* space */
#endif
                + strlen(ipsp_policy_strs[xpl->sadb_x_policy_type])
                + 1;    /* NUL */

        if ((buf = malloc(buflen)) == NULL) {
                __ipsec_errcode = EIPSEC_NO_BUFS;
                return NULL;
        }
#ifdef HAVE_PFKEY_POLICY_PRIORITY
        if (priority_offset != 0)
        {
                snprintf(buf, buflen, "%s %s %c %u %s", 
                ipsp_dir_strs[xpl->sadb_x_policy_dir], priority_str, operator, 
                        priority_offset, ipsp_policy_strs[xpl->sadb_x_policy_type]);
        }
        else if (strlen (priority_str) != 0)
        {
                snprintf(buf, buflen, "%s %s %s", 
                ipsp_dir_strs[xpl->sadb_x_policy_dir], priority_str, 
                        ipsp_policy_strs[xpl->sadb_x_policy_type]);
        }
        else
        {
                snprintf(buf, buflen, "%s %s", 
                ipsp_dir_strs[xpl->sadb_x_policy_dir],
                        ipsp_policy_strs[xpl->sadb_x_policy_type]);
        }
#else
        snprintf(buf, buflen, "%s %s", ipsp_dir_strs[xpl->sadb_x_policy_dir],
            ipsp_policy_strs[xpl->sadb_x_policy_type]);
#endif

        if (xpl->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
                __ipsec_errcode = EIPSEC_NO_ERROR;
                return buf;
        }

        /* count length of buffer for use */
        off = sizeof(*xpl);
        extlen = PFKEY_EXTLEN(xpl);
        while (off < extlen) {
                xisr = (const void *)((const char *)xpl + off);
                off += xisr->sadb_x_ipsecrequest_len;
        }

        /* validity check */
        if (off != extlen) {
                __ipsec_errcode = EIPSEC_INVAL_SADBMSG;
                free(buf);
                return NULL;
        }

        off = sizeof(*xpl);
        while (off < extlen) {
                size_t offset;
                xisr = (const void *)((const char *)xpl + off);

                if (ipsec_dump_ipsecrequest(isrbuf, sizeof(isrbuf), xisr,
                    extlen - off, withports) == NULL) {
                        free(buf);
                        return NULL;
                }

                offset = strlen(buf);
                buflen = offset + strlen(delimiter) + strlen(isrbuf) + 1;
                newbuf = realloc(buf, buflen);
                if (newbuf == NULL) {
                        __ipsec_errcode = EIPSEC_NO_BUFS;
                        free(buf);
                        return NULL;
                }
                buf = newbuf;
                snprintf(buf+offset, buflen-offset, "%s%s", delimiter, isrbuf);

                off += xisr->sadb_x_ipsecrequest_len;
        }

        __ipsec_errcode = EIPSEC_NO_ERROR;
        return buf;
}

static char *
ipsec_dump_ipsecrequest(char *buf, size_t len,
    const struct sadb_x_ipsecrequest *xisr,
    size_t bound /* boundary */, int withports)
{
        const char *proto, *mode, *level;
        char abuf[(NI_MAXHOST + NI_MAXSERV + 3) * 2 + 2];

        if (xisr->sadb_x_ipsecrequest_len > bound) {
                __ipsec_errcode = EIPSEC_INVAL_PROTO;
                return NULL;
        }

        switch (xisr->sadb_x_ipsecrequest_proto) {
        case IPPROTO_ESP:
                proto = "esp";
                break;
        case IPPROTO_AH:
                proto = "ah";
                break;
        case IPPROTO_IPCOMP:
                proto = "ipcomp";
                break;
        default:
                __ipsec_errcode = EIPSEC_INVAL_PROTO;
                return NULL;
        }

        switch (xisr->sadb_x_ipsecrequest_mode) {
        case IPSEC_MODE_ANY:
                mode = "any";
                break;
        case IPSEC_MODE_TRANSPORT:
                mode = "transport";
                break;
        case IPSEC_MODE_TUNNEL:
                mode = "tunnel";
                break;
        default:
                __ipsec_errcode = EIPSEC_INVAL_MODE;
                return NULL;
        }

        abuf[0] = '\0';
        if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
                const struct sockaddr *sa1, *sa2;
                const char *p;

                p = (const void *)(xisr + 1);
                sa1 = (const void *)p;
                sa2 = (const void *)(p + sysdep_sa_len(sa1));
                if (sizeof(*xisr) + sysdep_sa_len(sa1) + sysdep_sa_len(sa2) !=
                    xisr->sadb_x_ipsecrequest_len) {
                        __ipsec_errcode = EIPSEC_INVAL_ADDRESS;
                        return NULL;
                }
                if (set_addresses(abuf, sizeof(abuf), 
                    sa1, sa2, withports) != 0) {
                        __ipsec_errcode = EIPSEC_INVAL_ADDRESS;
                        return NULL;
                }
        }

        switch (xisr->sadb_x_ipsecrequest_level) {
        case IPSEC_LEVEL_DEFAULT:
                level = "default";
                break;
        case IPSEC_LEVEL_USE:
                level = "use";
                break;
        case IPSEC_LEVEL_REQUIRE:
                level = "require";
                break;
        case IPSEC_LEVEL_UNIQUE:
                level = "unique";
                break;
        default:
                __ipsec_errcode = EIPSEC_INVAL_LEVEL;
                return NULL;
        }

        if (xisr->sadb_x_ipsecrequest_reqid == 0)
                snprintf(buf, len, "%s/%s/%s/%s", proto, mode, abuf, level);
        else {
                int ch;

                if (xisr->sadb_x_ipsecrequest_reqid > IPSEC_MANUAL_REQID_MAX)
                        ch = '#';
                else
                        ch = ':';
                snprintf(buf, len, "%s/%s/%s/%s%c%u", proto, mode, abuf, level,
                    ch, xisr->sadb_x_ipsecrequest_reqid);
        }

        return buf;
}

static int
set_addresses(char *buf, size_t len, const struct sockaddr *sa1,
    const struct sockaddr *sa2, int withports)
{
        char tmp1[NI_MAXHOST + NI_MAXSERV + 3], tmp2[sizeof(tmp1)];

        if (set_address(tmp1, sizeof(tmp1), sa1, withports) == NULL ||
            set_address(tmp2, sizeof(tmp2), sa2, withports) == NULL)
                return -1;
        if (strlen(tmp1) + 1 + strlen(tmp2) + 1 > len)
                return -1;
        snprintf(buf, len, "%s-%s", tmp1, tmp2);
        return 0;
}

static char *
set_address(char *buf, size_t len, const struct sockaddr *sa, int withports)
{
        const int niflags = NI_NUMERICHOST | NI_NUMERICSERV;
        char host[NI_MAXHOST];
        char serv[NI_MAXSERV];

        if (len < 1)
                return NULL;
        buf[0] = '\0';
        if (getnameinfo(sa, (socklen_t)sysdep_sa_len(sa), host, sizeof(host), 
            serv, sizeof(serv), niflags) != 0)
                return NULL;

        if (withports)
                snprintf(buf, len, "%s[%s]", host, serv);
        else
                snprintf(buf, len, "%s", host);

        return buf;
}