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First pass at removing clauses 3 and 4 from NetBSD licenses.

Not sure what's more surprising: how long it took for NetBSD to
catch up to the rest of the BSDs (including UCB), or the amount of
code that NetBSD has claimed for itself without attributing to the
actual authors.

OK deraadt@

/*	$OpenBSD: getent.c,v 1.5 2008/06/26 05:42:21 ray 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	networks(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,		},
	{	"networks",	networks,	},
	{	"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[MAXHOSTNAMELEN], *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
hosts(int argc, char *argv[])
{
	char		addr[IN6ADDRSZ];
	int		i, rv = RV_OK;
	struct hostent	*he;

	sethostent(1);
	if (argc == 2) {
		while ((he = gethostent()) != NULL)
			hostsprint(he);
	} else {
		for (i = 2; i < argc; i++) {
			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);
			else
				he = gethostbyname(argv[i]);
			if (he != NULL)
				hostsprint(he);
			else {
				rv = RV_NOTFOUND;
				break;
			}
		}
	}
	endhostent();
	return rv;
}

static void
networksprint(const struct netent *ne)
{
	char		buf[INET6_ADDRSTRLEN];
	struct in_addr	ianet;

	ianet = inet_makeaddr(ne->n_net, 0);
	if (inet_ntop(ne->n_addrtype, &ianet, buf, sizeof(buf)) == NULL)
		strlcpy(buf, "# unknown", sizeof(buf));
	printfmtstrings(ne->n_aliases, "  ", " ", "%-16s  %s", ne->n_name, buf);
}

static int
networks(int argc, char *argv[])
{
	int		i, rv = RV_OK;
	struct netent	*ne;
	in_addr_t	net;

	setnetent(1);
	if (argc == 2) {
		while ((ne = getnetent()) != NULL)
			networksprint(ne);
	} else {
		for (i = 2; i < argc; i++) {
			net = inet_network(argv[i]);
			if (net != INADDR_NONE)
				ne = getnetbyaddr(net, AF_INET);
			else
				ne = getnetbyname(argv[i]);
			if (ne != NULL)
				networksprint(ne);
			else {
				rv = RV_NOTFOUND;
				break;
			}
		}
	}
	endnetent();
	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;
}