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allow ssh-keyscan(1) to accept CIDR address ranges, e.g.
ssh-keyscan 192.168.0.0/24

If a CIDR range is passed, then it will be expanded to all possible
addresses in the range including the all-0s and all-1s addresses.

bz#976 feedback/ok markus@

/*
 * Copyright (c) 2004,2005 Damien Miller <djm@mindrot.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* Address handling routines */

#ifndef _ADDR_H
#define _ADDR_H

#include <sys/socket.h>
#include <netinet/in.h>

struct xaddr {
	sa_family_t	af;
	union {
		struct in_addr		v4;
		struct in6_addr		v6;
		u_int8_t		addr8[16];
		u_int16_t		addr16[8];
		u_int32_t		addr32[4];
	} xa;		    /* 128-bit address */
	u_int32_t	scope_id;	/* iface scope id for v6 */
#define v4	xa.v4
#define v6	xa.v6
#define addr8	xa.addr8
#define addr16	xa.addr16
#define addr32	xa.addr32
};

int addr_unicast_masklen(int af);
int addr_xaddr_to_sa(const struct xaddr *xa, struct sockaddr *sa,
    socklen_t *len, u_int16_t port);
int addr_sa_to_xaddr(struct sockaddr *sa, socklen_t slen, struct xaddr *xa);
int addr_netmask(int af, u_int l, struct xaddr *n);
int addr_hostmask(int af, u_int l, struct xaddr *n);
int addr_invert(struct xaddr *n);
int addr_pton(const char *p, struct xaddr *n);
int addr_sa_pton(const char *h, const char *s, struct sockaddr *sa,
    socklen_t slen);
int addr_pton_cidr(const char *p, struct xaddr *n, u_int *l);
int addr_ntop(const struct xaddr *n, char *p, size_t len);
int addr_and(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b);
int addr_or(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b);
int addr_cmp(const struct xaddr *a, const struct xaddr *b);
int addr_is_all0s(const struct xaddr *n);
int addr_host_is_all0s(const struct xaddr *n, u_int masklen);
int addr_host_to_all0s(struct xaddr *a, u_int masklen);
int addr_host_to_all1s(struct xaddr *a, u_int masklen);
int addr_netmatch(const struct xaddr *host, const struct xaddr *net,
    u_int masklen);
void addr_increment(struct xaddr *a);
#endif /* _ADDR_H */