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Retry DNS lookup for remote loghost.

If DNS lookup for a remote loghost configured in syslog.conf did
not work at startup, the entry was ignored.  Better retry the lookup
in intervals until it succeeds.  Improve debug output to print IP
address after resolution.  Unify retry code that resolves DNS for
UDP and connects to TCP server.

testing and feedback from Paul de Weerd; OK deraadt@

/*	$OpenBSD: syslogd.h,v 1.37 2023/10/12 22:36:54 bluhm Exp $ */

/*
 * Copyright (c) 2014-2017 Alexander Bluhm <bluhm@genua.de>
 * Copyright (c) 2003 Anil Madhavapeddy <anil@recoil.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.
 */

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

#include <stdarg.h>

extern int	ZuluTime;

/* Privilege separation */
void  priv_init(int, int, int, char **);
__dead void priv_exec(char *, int, int, int, char **);
int   priv_open_tty(const char *);
int   priv_open_log(const char *);
FILE *priv_open_utmp(void);
FILE *priv_open_config(void);
void  priv_config_parse_done(void);
int   priv_config_modified(void);
int   priv_getaddrinfo(const char *, const char *, const char *,
    struct sockaddr *, size_t);
int   priv_getnameinfo(struct sockaddr *, socklen_t, char *, size_t);

#define IOVCNT		7

/* Terminal message */
#define TTYMSGTIME	1		/* timeout used by ttymsg */
#define TTYMAXDELAY	256		/* max events in ttymsg */
void ttymsg(char *, struct iovec *);

/* File descriptor send/recv */
void send_fd(int, int);
int  receive_fd(int);

#define ERRBUFSIZE	256
void vlogmsg(int pri, const char *, const char *, va_list);
__dead void die(int);
extern int Debug;

struct ringbuf {
	char *buf;
	size_t len, start, end;
};

struct ringbuf *ringbuf_init(size_t);
void		ringbuf_free(struct ringbuf *);
void		ringbuf_clear(struct ringbuf *);
size_t		ringbuf_used(struct ringbuf *);
int		ringbuf_append_line(struct ringbuf *, char *);
ssize_t		ringbuf_to_string(char *, size_t, struct ringbuf *);