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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright 2021 Lutz Donnerhacke
*
* 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 copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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 <arpa/inet.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#ifndef _UTIL_H
#define _UTIL_H
/* common ip ranges */
extern struct in_addr masq, pub, pub2, prv1, prv2, prv3, cgn, ext, ANY_ADDR;
int randcmp(const void *a, const void *b);
void hexdump(void *p, size_t len);
struct ip * ip_packet(u_char protocol, size_t len);
struct udphdr * set_udp(struct ip *p, u_short sport, u_short dport);
static inline int
addr_eq(struct in_addr a, struct in_addr b)
{
return a.s_addr == b.s_addr;
}
#define a2h(a) ntohl(a.s_addr)
static inline int
rand_range(int min, int max)
{
return min + rand()%(max - min);
}
#define NAT_CHECK(pip, src, dst, msq) do { \
int res; \
int len = ntohs(pip->ip_len); \
pip->ip_src = src; \
pip->ip_dst = dst; \
res = LibAliasOut(la, pip, len); \
ATF_CHECK_MSG(res == PKT_ALIAS_OK, \
">%d< not met PKT_ALIAS_OK", res); \
ATF_CHECK(addr_eq(msq, pip->ip_src)); \
ATF_CHECK(addr_eq(dst, pip->ip_dst)); \
} while(0)
#define NAT_FAIL(pip, src, dst) do { \
int res; \
int len = ntohs(pip->ip_len); \
pip->ip_src = src; \
pip->ip_dst = dst; \
res = LibAliasOut(la, pip, len); \
ATF_CHECK_MSG(res != PKT_ALIAS_OK, \
">%d< not met !PKT_ALIAS_OK", res); \
ATF_CHECK(addr_eq(src, pip->ip_src)); \
ATF_CHECK(addr_eq(dst, pip->ip_dst)); \
} while(0)
#define UNNAT_CHECK(pip, src, dst, rel) do { \
int res; \
int len = ntohs(pip->ip_len); \
pip->ip_src = src; \
pip->ip_dst = dst; \
res = LibAliasIn(la, pip, len); \
ATF_CHECK_MSG(res == PKT_ALIAS_OK, \
">%d< not met PKT_ALIAS_OK", res); \
ATF_CHECK(addr_eq(src, pip->ip_src)); \
ATF_CHECK(addr_eq(rel, pip->ip_dst)); \
} while(0)
#define UNNAT_FAIL(pip, src, dst) do { \
int res; \
int len = ntohs(pip->ip_len); \
pip->ip_src = src; \
pip->ip_dst = dst; \
res = LibAliasIn(la, pip, len); \
ATF_CHECK_MSG(res != PKT_ALIAS_OK, \
">%d< not met !PKT_ALIAS_OK", res); \
ATF_CHECK(addr_eq(src, pip->ip_src)); \
ATF_CHECK(addr_eq(dst, pip->ip_dst)); \
} while(0)
#define UDP_NAT_CHECK(p, u, si, sp, di, dp, mi) do { \
u = set_udp(p, (sp), (dp)); \
NAT_CHECK(p, (si), (di), (mi)); \
ATF_CHECK(u->uh_dport == htons(dp)); \
} while(0)
#define UDP_NAT_FAIL(p, u, si, sp, di, dp) do { \
u = set_udp(p, (sp), (dp)); \
NAT_FAIL(p, (si), (di)); \
} while(0)
#define UDP_UNNAT_CHECK(p, u, si, sp, mi, mp, di, dp) \
do { \
u = set_udp(p, (sp), (mp)); \
UNNAT_CHECK(p, (si), (mi), (di)); \
ATF_CHECK(u->uh_sport == htons(sp)); \
ATF_CHECK(u->uh_dport == htons(dp)); \
} while(0)
#define UDP_UNNAT_FAIL(p, u, si, sp, mi, mp) do { \
u = set_udp(p, (sp), (mp)); \
UNNAT_FAIL(p, (si), (mi)); \
} while(0)
#endif /* _UTIL_H */
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