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add a ssh_config KnownHostsCommand that allows the client to obtain
known_hosts data from a command in addition to the usual files.

The command accepts bunch of %-expansions, including details of the
connection and the offered server host key. Note that the command may
be invoked up to three times per connection (see the manpage for
details).

ok markus@

/* $OpenBSD: sshconnect.h,v 1.46 2020/12/22 00:15:23 djm Exp $ */

/*
 * Copyright (c) 2000 Markus Friedl.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

typedef struct Sensitive Sensitive;
struct Sensitive {
	struct sshkey	**keys;
	int		nkeys;
};

struct ssh_conn_info {
	char *conn_hash_hex;
	char *shorthost;
	char *uidstr;
	char *keyalias;
	char *thishost;
	char *host_arg;
	char *portstr;
	char *remhost;
	char *remuser;
	char *homedir;
	char *locuser;
};

struct addrinfo;
struct ssh;
struct hostkeys;
struct ssh_conn_info;

/* default argument for client percent expansions */
#define DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(conn_info) \
	"C", conn_info->conn_hash_hex, \
	"L", conn_info->shorthost, \
	"i", conn_info->uidstr, \
	"k", conn_info->keyalias, \
	"l", conn_info->thishost, \
	"n", conn_info->host_arg, \
	"p", conn_info->portstr, \
	"d", conn_info->homedir, \
	"h", conn_info->remhost, \
	"r", conn_info->remuser, \
	"u", conn_info->locuser

int	 ssh_connect(struct ssh *, const char *, const char *,
	    struct addrinfo *, struct sockaddr_storage *, u_short,
	    int, int *, int);
void	 ssh_kill_proxy_command(void);

void	 ssh_login(struct ssh *, Sensitive *, const char *,
    struct sockaddr *, u_short, struct passwd *, int,
    const struct ssh_conn_info *);

int	 verify_host_key(char *, struct sockaddr *, struct sshkey *,
    const struct ssh_conn_info *);

void	 get_hostfile_hostname_ipaddr(char *, struct sockaddr *, u_short,
    char **, char **);

void	 ssh_kex2(struct ssh *ssh, char *, struct sockaddr *, u_short,
    const struct ssh_conn_info *);

void	 ssh_userauth2(struct ssh *ssh, const char *, const char *,
    char *, Sensitive *);

int	 ssh_local_cmd(const char *);

void	 maybe_add_key_to_agent(const char *, struct sshkey *,
    const char *, const char *);

void	 load_hostkeys_command(struct hostkeys *, const char *,
    const char *, const struct ssh_conn_info *,
    const struct sshkey *, const char *);