alicelinux

getent.c (9438B)

---

 /*-
  * Copyright (c) 2004-2006 The NetBSD Foundation, Inc.
  * All rights reserved.
  *
  * This code is derived from software contributed to The NetBSD Foundation
  * by Luke Mewburn.
  * Timo Teräs cleaned up the code for use in Alpine Linux with musl libc.
  *
  * 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/socket.h>
 #include <sys/param.h>
 #include <ctype.h>
 #include <errno.h>
 #include <limits.h>
 #include <netdb.h>
 #include <pwd.h>
 #include <grp.h>
 #include <stdio.h>
 #include <stdarg.h>
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <paths.h>
 #include <err.h>
 
 #include <arpa/inet.h>
 #include <arpa/nameser.h>
 
 #include <net/if.h>
 #include <net/ethernet.h>
 #include <netinet/ether.h>
 #include <netinet/in.h>
 
 enum {
 	RV_OK		= 0,
 	RV_USAGE	= 1,
 	RV_NOTFOUND	= 2,
 	RV_NOENUM	= 3
 };
 
 static int usage(const char *);
 
 static int parsenum(const char *word, unsigned long *result)
 {
 	unsigned long	num;
 	char		*ep;
 
 	if (!isdigit((unsigned char)word[0]))
 		return 0;
 	errno = 0;
 	num = strtoul(word, &ep, 10);
 	if (num == ULONG_MAX && errno == ERANGE)
 		return 0;
 	if (*ep != '\0')
 		return 0;
 	*result = num;
 	return 1;
 }
 
 /*
  * printfmtstrings --
  *	vprintf(format, ...),
  *	then the aliases (beginning with prefix, separated by sep),
  *	then a newline
  */
 __attribute__ ((format (printf, 4, 5)))
 static void printfmtstrings(char *strings[], const char *prefix, const char *sep,
 	const char *fmt, ...)
 {
 	va_list		ap;
 	const char	*curpref;
 	size_t		i;
 
 	va_start(ap, fmt);
 	(void)vprintf(fmt, ap);
 	va_end(ap);
 
 	curpref = prefix;
 	for (i = 0; strings[i] != NULL; i++) {
 		(void)printf("%s%s", curpref, strings[i]);
 		curpref = sep;
 	}
 	(void)printf("\n");
 }
 
 static int ethers(int argc, char *argv[])
 {
 	char		hostname[MAXHOSTNAMELEN + 1], *hp;
 	struct ether_addr ea, *eap;
 	int		i, rv;
 
 	if (argc == 2) {
 		warnx("Enumeration not supported on ethers");
 		return RV_NOENUM;
 	}
 
 	rv = RV_OK;
 	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;
 			}
 		}
 		(void)printf("%-17s  %s\n", ether_ntoa(eap), hp);
 	}
 	return rv;
 }
 
 static void groupprint(const struct group *gr)
 {
 	printfmtstrings(gr->gr_mem, ":", ",", "%s:%s:%u",
 			gr->gr_name, gr->gr_passwd, gr->gr_gid);
 }
 
 static int group(int argc, char *argv[])
 {
 	struct group	*gr;
 	unsigned long	id;
 	int		i, rv;
 
 	rv = RV_OK;
 	if (argc == 2) {
 		while ((gr = getgrent()) != NULL)
 			groupprint(gr);
 	} else {
 		for (i = 2; i < argc; i++) {
 			if (parsenum(argv[i], &id))
 				gr = getgrgid((gid_t)id);
 			else
 				gr = getgrnam(argv[i]);
 			if (gr == NULL) {
 				rv = RV_NOTFOUND;
 				break;
 			}
 			groupprint(gr);
 		}
 	}
 	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)
 		(void)strlcpy(buf, "# unknown", sizeof(buf));
 	printfmtstrings(he->h_aliases, "  ", " ", "%-16s  %s", buf, he->h_name);
 }
 
 static int hosts(int argc, char *argv[])
 {
 	struct hostent	*he;
 	char		addr[IN6ADDRSZ];
 	int		i, rv;
 
 	sethostent(1);
 	rv = RV_OK;
 	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) {
 				rv = RV_NOTFOUND;
 				break;
 			}
 			hostsprint(he);
 		}
 	}
 	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)
 		(void)strlcpy(buf, "# unknown", sizeof(buf));
 	printfmtstrings(ne->n_aliases, "  ", " ", "%-16s  %s", ne->n_name, buf);
 }
 
 static int networks(int argc, char *argv[])
 {
 	struct netent	*ne;
 	in_addr_t	net;
 	int		i, rv;
 
 	setnetent(1);
 	rv = RV_OK;
 	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) {
 				rv = RV_NOTFOUND;
 				break;
 			}
 			networksprint(ne);
 		}
 	}
 	endnetent();
 	return rv;
 }
 
 static void passwdprint(struct passwd *pw)
 {
 	(void)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[])
 {
 	struct passwd	*pw;
 	unsigned long	id;
 	int		i, rv;
 
 	rv = RV_OK;
 	if (argc == 2) {
 		while ((pw = getpwent()) != NULL)
 			passwdprint(pw);
 	} else {
 		for (i = 2; i < argc; i++) {
 			if (parsenum(argv[i], &id))
 				pw = getpwuid((uid_t)id);
 			else
 				pw = getpwnam(argv[i]);
 			if (pw == NULL) {
 				rv = RV_NOTFOUND;
 				break;
 			}
 			passwdprint(pw);
 		}
 	}
 	endpwent();
 	return rv;
 }
 
 static void protocolsprint(struct protoent *pe)
 {
 	printfmtstrings(pe->p_aliases, "  ", " ",
 			"%-16s  %5d", pe->p_name, pe->p_proto);
 }
 
 static int protocols(int argc, char *argv[])
 {
 	struct protoent	*pe;
 	unsigned long	id;
 	int		i, rv;
 
 	setprotoent(1);
 	rv = RV_OK;
 	if (argc == 2) {
 		while ((pe = getprotoent()) != NULL)
 			protocolsprint(pe);
 	} else {
 		for (i = 2; i < argc; i++) {
 			if (parsenum(argv[i], &id))
 				pe = getprotobynumber((int)id);
 			else
 				pe = getprotobyname(argv[i]);
 			if (pe == NULL) {
 				rv = RV_NOTFOUND;
 				break;
 			}
 			protocolsprint(pe);
 		}
 	}
 	endprotoent();
 	return rv;
 }
 
 static void servicesprint(struct servent *se)
 {
 	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;
 	unsigned long	id;
 	char		*proto;
 	int		i, rv;
 
 	setservent(1);
 	rv = RV_OK;
 	if (argc == 2) {
 		while ((se = getservent()) != NULL)
 			servicesprint(se);
 	} else {
 		for (i = 2; i < argc; i++) {
 			proto = strchr(argv[i], '/');
 			if (proto != NULL)
 				*proto++ = '\0';
 			if (parsenum(argv[i], &id))
 				se = getservbyport(htons(id), proto);
 			else
 				se = getservbyname(argv[i], proto);
 			if (se == NULL) {
 				rv = RV_NOTFOUND;
 				break;
 			}
 			servicesprint(se);
 		}
 	}
 	endservent();
 	return rv;
 }
 
 static int shells(int argc, char *argv[])
 {
 	const char	*sh;
 	int		i, rv;
 
 	setusershell();
 	rv = RV_OK;
 	if (argc == 2) {
 		while ((sh = getusershell()) != NULL)
 			(void)printf("%s\n", sh);
 	} else {
 		for (i = 2; i < argc; i++) {
 			setusershell();
 			while ((sh = getusershell()) != NULL) {
 				if (strcmp(sh, argv[i]) == 0) {
 					(void)printf("%s\n", sh);
 					break;
 				}
 			}
 			if (sh == NULL) {
 				rv = RV_NOTFOUND;
 				break;
 			}
 		}
 	}
 	endusershell();
 	return rv;
 }
 
 static struct getentdb {
 	const char	*name;
 	int		(*callback)(int, char *[]);
 } databases[] = {
 	{	"ethers",	ethers,		},
 	{	"group",	group,		},
 	{	"hosts",	hosts,		},
 	{	"networks",	networks,	},
 	{	"passwd",	passwd,		},
 	{	"protocols",	protocols,	},
 	{	"services",	services,	},
 	{	"shells",	shells,		},
 
 	{	NULL,		NULL,		},
 };
 
 static int usage(const char *arg0)
 {
 	struct getentdb	*curdb;
 	size_t i;
 
 	(void)fprintf(stderr, "Usage: %s database [key ...]\n", arg0);
 	(void)fprintf(stderr, "\tdatabase may be one of:");
 	for (i = 0, curdb = databases; curdb->name != NULL; curdb++, i++) {
 		if (i % 7 == 0)
 			(void)fputs("\n\t\t", stderr);
 		(void)fprintf(stderr, "%s%s", i % 7 == 0 ? "" : " ",
 		    curdb->name);
 	}
 	(void)fprintf(stderr, "\n");
 	exit(RV_USAGE);
 	/* NOTREACHED */
 }
 
 int
 main(int argc, char *argv[])
 {
 	struct getentdb	*curdb;
 
 	if (argc < 2)
 		usage(argv[0]);
 	for (curdb = databases; curdb->name != NULL; curdb++)
 		if (strcmp(curdb->name, argv[1]) == 0)
 			return (*curdb->callback)(argc, argv);
 
 	warn("Unknown database `%s'", argv[1]);
 	usage(argv[0]);
 	/* NOTREACHED */
 }