161 lines
3.5 KiB
C
161 lines
3.5 KiB
C
/* $NetBSD: ipsec.c,v 1.8 2021/09/03 21:02:04 rillig Exp $ */
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/*
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* Copyright (C) 1999 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <ctype.h>
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#ifdef IPSEC
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#include <netipsec/ipsec.h>
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#ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */
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#undef IPSEC
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#endif
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#endif
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#include "ipsec.h"
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#ifdef IPSEC
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int
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ipsecsetup(int af, int fd, const char *policy)
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{
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char *p0, *p;
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int error;
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if (policy == NULL || *policy == '\0')
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p0 = p = strdup("in entrust; out entrust");
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else
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p0 = p = strdup(policy);
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error = 0;
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for (;;) {
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p = strtok(p, ";");
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if (p == NULL)
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break;
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while (isspace((unsigned char)*p))
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p++;
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if (*p == '\0') {
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p = NULL;
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continue;
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}
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error = ipsecsetup0(af, fd, p, true);
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if (error < 0)
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break;
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p = NULL;
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}
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free(p0);
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return error;
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}
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int
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ipsecsetup_test(const char *policy)
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{
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char *p0, *p;
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char *buf;
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int error;
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if (policy == NULL)
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return -1;
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p0 = p = strdup(policy);
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if (p == NULL)
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return -1;
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error = 0;
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for (;;) {
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p = strtok(p, ";");
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if (p == NULL)
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break;
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while (isspace((unsigned char)*p))
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p++;
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if (*p == '\0') {
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p = NULL;
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continue;
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}
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buf = ipsec_set_policy(p, (int)strlen(p));
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if (buf == NULL) {
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error = -1;
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break;
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}
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free(buf);
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p = NULL;
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}
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free(p0);
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return error;
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}
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int
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ipsecsetup0(int af, int fd, const char *policy, int commit)
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{
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int level;
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int opt;
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char *buf;
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int error;
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switch (af) {
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case AF_INET:
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level = IPPROTO_IP;
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opt = IP_IPSEC_POLICY;
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break;
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#ifdef INET6
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case AF_INET6:
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level = IPPROTO_IPV6;
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opt = IPV6_IPSEC_POLICY;
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break;
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#endif
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default:
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return -1;
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}
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buf = ipsec_set_policy(policy, (int)strlen(policy));
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if (buf != NULL) {
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error = 0;
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if (commit && setsockopt(fd, level, opt,
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buf, (socklen_t)ipsec_get_policylen(buf)) < 0) {
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error = -1;
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}
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free(buf);
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} else
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error = -1;
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return error;
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}
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#endif
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