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Replace <sys/param.h> with <limits.h> and other less dirty headers where
possible.  Annotate <sys/param.h> lines with their current reasons.  Switch
to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc.  Change
MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where
sensible to avoid pulling in the pollution.  These are the files confirmed
through binary verification.
ok guenther, millert, doug (helped with the verification protocol)

/*	$OpenBSD: getent.c,v 1.9 2015/01/16 06:40:08 deraadt Exp $	*/
/*	$NetBSD: getent.c,v 1.7 2005/08/24 14:31:02 ginsbach Exp $	*/

/*-
 * Copyright (c) 2004 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Luke Mewburn.
 *
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <sys/socket.h>

#include <ctype.h>
#include <errno.h>
#include <grp.h>
#include <limits.h>
#include <netdb.h>
#include <pwd.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <net/if.h>
#include <netinet/in.h>		/* for INET6_ADDRSTRLEN */
#include <netinet/if_ether.h>

#include <arpa/inet.h>
#include <arpa/nameser.h>

#include <rpc/rpc.h>

static int	usage(void);
static int	ethers(int, char *[]);
static int	group(int, char *[]);
static int	hosts(int, char *[]);
static int	passwd(int, char *[]);
static int	protocols(int, char *[]);
static int	rpc(int, char *[]);
static int	services(int, char *[]);
static int	shells(int, char *[]);
extern char *__progname;

enum {
	RV_OK		= 0,
	RV_USAGE	= 1,
	RV_NOTFOUND	= 2,
	RV_NOENUM	= 3
};

static struct getentdb {
	const char	*name;
	int		(*fn)(int, char *[]);
} databases[] = {
	{	"ethers",	ethers,		},
	{	"group",	group,		},
	{	"hosts",	hosts,		},
	{	"passwd",	passwd,		},
	{	"protocols",	protocols,	},
	{	"rpc",		rpc,		},
	{	"services",	services,	},
	{	"shells",	shells,		},

	{	NULL,		NULL,		},
};

int
main(int argc, char *argv[])
{
	struct getentdb	*curdb;

	if (argc < 2)
		usage();
	for (curdb = databases; curdb->name != NULL; curdb++) {
		if (strcmp(curdb->name, argv[1]) == 0) {
			exit(curdb->fn(argc, argv));
			break;
		}
	}
	fprintf(stderr, "%s: unknown database: %s\n", __progname, argv[1]);
	return RV_USAGE;
}

static int
usage(void)
{
	fprintf(stderr, "usage: %s database [key ...]\n", __progname);
	exit(RV_USAGE);
	/* NOTREACHED */
}

/*
 * printfmtstrings --
 *	vprintf(format, ...),
 *	then the aliases (beginning with prefix, separated by sep),
 *	then a newline
 */
static void
printfmtstrings(char *strings[], const char *prefix, const char *sep,
	const char *fmt, ...)
{
	va_list		ap;
	const char	*curpref;
	int		i;

	va_start(ap, fmt);
	vprintf(fmt, ap);
	va_end(ap);

	curpref = prefix;
	for (i = 0; strings[i] != NULL; i++) {
		printf("%s%s", curpref, strings[i]);
		curpref = sep;
	}
	printf("\n");
}

#define ETHERSPRINT	printf("%-17s  %s\n", ether_ntoa(eap), hp)

static int
ethers(int argc, char *argv[])
{
	char		hostname[HOST_NAME_MAX+1], *hp;
	int		i, rv = RV_OK;
	struct ether_addr ea, *eap;

	if (argc == 2) {
		fprintf(stderr, "%s: Enumeration not supported on ethers\n",
		    __progname);
		rv = RV_NOENUM;
	} else {
		for (i = 2; i < argc; i++) {
			if ((eap = ether_aton(argv[i])) == NULL) {
				eap = &ea;
				hp = argv[i];
				if (ether_hostton(hp, eap) != 0) {
					rv = RV_NOTFOUND;
					break;
				}
			} else {
				hp = hostname;
				if (ether_ntohost(hp, eap) != 0) {
					rv = RV_NOTFOUND;
					break;
				}
			}
			ETHERSPRINT;
		}
	}
	return rv;
}

#define GROUPPRINT	\
	printfmtstrings(gr->gr_mem, ":", ",", "%s:%s:%u", \
	    gr->gr_name, gr->gr_passwd, gr->gr_gid)

static int
group(int argc, char *argv[])
{
	int		i, rv = RV_OK;
	struct group	*gr;

	setgroupent(1);
	if (argc == 2) {
		while ((gr = getgrent()) != NULL)
			GROUPPRINT;
	} else {
		for (i = 2; i < argc; i++) {
			const char	*err;
			long long id = strtonum(argv[i], 0, UINT_MAX, &err);

			if (!err)
				gr = getgrgid((gid_t)id);
			else
				gr = getgrnam(argv[i]);
			if (gr != NULL)
				GROUPPRINT;
			else {
				rv = RV_NOTFOUND;
				break;
			}
		}
	}
	endgrent();
	return rv;
}

static void
hostsprint(const struct hostent *he)
{
	char	buf[INET6_ADDRSTRLEN];

	if (inet_ntop(he->h_addrtype, he->h_addr, buf, sizeof(buf)) == NULL)
		strlcpy(buf, "# unknown", sizeof(buf));
	printfmtstrings(he->h_aliases, "  ", " ", "%-16s  %s", buf, he->h_name);
}
static int
hostsaddrinfo(char* name)
{
	struct addrinfo	 hints, *res, *res0;
	void		*src;
	int		 rv;
	char		 buf[INET6_ADDRSTRLEN];

	rv = RV_NOTFOUND;
	memset(buf, 0, sizeof(buf));
	memset(&hints, 0, sizeof(hints));
	hints.ai_family = PF_UNSPEC;
	hints.ai_socktype = SOCK_DGRAM;

	if (getaddrinfo(name, NULL, &hints, &res0) == 0) {
		for (res = res0; res; res = res->ai_next) {
			switch (res->ai_family) {
			case AF_INET:
				src = &((struct sockaddr_in*)
				    res->ai_addr)->sin_addr;
				break;
			case AF_INET6:
				src = &((struct sockaddr_in6*)
				    res->ai_addr)->sin6_addr;
				break;
			default: /* not reached */
				src = NULL;
			}
			if (src==NULL || inet_ntop(res->ai_family, src, buf,
			    sizeof(buf)) == NULL)
				strlcpy(buf, "# unknown", sizeof(buf));
			else
				rv = RV_OK;
			printf("%-39s %s\n", buf, name);
		}
		freeaddrinfo(res0);
	}

	return (rv);
}

static int
hosts(int argc, char *argv[])
{
	char		addr[IN6ADDRSZ];
	int		i, rv = RV_OK;
	struct hostent	*he;

	if (argc == 2) {
		fprintf(stderr, "%s: Enumeration not supported on hosts\n",
		    __progname);
		rv = RV_NOENUM;
	} else {
		for (i = 2; i < argc; i++) {
			he = NULL;
			if (inet_pton(AF_INET6, argv[i], (void *)addr) > 0)
				he = gethostbyaddr(addr, IN6ADDRSZ, AF_INET6);
			else if (inet_pton(AF_INET, argv[i], (void *)addr) > 0)
				he = gethostbyaddr(addr, INADDRSZ, AF_INET);
			if (he != NULL)
				hostsprint(he);
			else if ((rv = hostsaddrinfo(argv[i])) == RV_NOTFOUND)
				break;
		}
	}
	return rv;
}

#define PASSWDPRINT	\
	printf("%s:%s:%u:%u:%s:%s:%s\n", \
	    pw->pw_name, pw->pw_passwd, pw->pw_uid, \
	    pw->pw_gid, pw->pw_gecos, pw->pw_dir, pw->pw_shell)

static int
passwd(int argc, char *argv[])
{
	int		i, rv = RV_OK;
	struct passwd	*pw;

	setpassent(1);
	if (argc == 2) {
		while ((pw = getpwent()) != NULL)
			PASSWDPRINT;
	} else {
		for (i = 2; i < argc; i++) {
			const char	*err;
			long long id = strtonum(argv[i], 0, UINT_MAX, &err);

			if (!err)
				pw = getpwuid((uid_t)id);
			else
				pw = getpwnam(argv[i]);
			if (pw != NULL)
				PASSWDPRINT;
			else {
				rv = RV_NOTFOUND;
				break;
			}
		}
	}
	endpwent();
	return rv;
}

#define PROTOCOLSPRINT	\
	printfmtstrings(pe->p_aliases, "  ", " ", \
	    "%-16s  %5d", pe->p_name, pe->p_proto)

static int
protocols(int argc, char *argv[])
{
	struct protoent	*pe;
	int		i, rv = RV_OK;

	setprotoent(1);
	if (argc == 2) {
		while ((pe = getprotoent()) != NULL)
			PROTOCOLSPRINT;
	} else {
		for (i = 2; i < argc; i++) {
			const char	*err;
			long long id = strtonum(argv[i], 0, UINT_MAX, &err);

			if (!err)
				pe = getprotobynumber((int)id);
			else
				pe = getprotobyname(argv[i]);
			if (pe != NULL)
				PROTOCOLSPRINT;
			else {
				rv = RV_NOTFOUND;
				break;
			}
		}
	}
	endprotoent();
	return rv;
}

#define RPCPRINT	\
	printfmtstrings(re->r_aliases, "  ", " ", \
	    "%-16s  %6d", re->r_name, re->r_number)

static int
rpc(int argc, char *argv[])
{
	struct rpcent	*re;
	int		i, rv = RV_OK;

	setrpcent(1);
	if (argc == 2) {
		while ((re = getrpcent()) != NULL)
			RPCPRINT;
	} else {
		for (i = 2; i < argc; i++) {
			const char	*err;
			long long id = strtonum(argv[i], 0, UINT_MAX, &err);

			if (!err)
				re = getrpcbynumber((int)id);
			else
				re = getrpcbyname(argv[i]);
			if (re != NULL)
				RPCPRINT;
			else {
				rv = RV_NOTFOUND;
				break;
			}
		}
	}
	endrpcent();
	return rv;
}

#define SERVICESPRINT	\
	printfmtstrings(se->s_aliases, "  ", " ", \
	    "%-16s  %5d/%s", se->s_name, ntohs(se->s_port), se->s_proto)

static int
services(int argc, char *argv[])
{
	struct servent	*se;
	int		i, rv = RV_OK;

	setservent(1);
	if (argc == 2) {
		while ((se = getservent()) != NULL)
			SERVICESPRINT;
	} else {
		for (i = 2; i < argc; i++) {
			const char	*err;
			long long	id;
			char *proto = strchr(argv[i], '/');

			if (proto != NULL)
				*proto++ = '\0';
			id = strtonum(argv[i], 0, UINT_MAX, &err);
			if (!err)
				se = getservbyport(htons((u_short)id), proto);
			else
				se = getservbyname(argv[i], proto);
			if (se != NULL)
				SERVICESPRINT;
			else {
				rv = RV_NOTFOUND;
				break;
			}
		}
	}
	endservent();
	return rv;
}

#define SHELLSPRINT	printf("%s\n", sh)

static int
shells(int argc, char *argv[])
{
	const char	*sh;
	int		i, rv = RV_OK;

	setusershell();
	if (argc == 2) {
		while ((sh = getusershell()) != NULL)
			SHELLSPRINT;
	} else {
		for (i = 2; i < argc; i++) {
			setusershell();
			while ((sh = getusershell()) != NULL) {
				if (strcmp(sh, argv[i]) == 0) {
					SHELLSPRINT;
					break;
				}
			}
			if (sh == NULL) {
				rv = RV_NOTFOUND;
				break;
			}
		}
	}
	endusershell();
	return rv;
}