460 lines
9.9 KiB
C
460 lines
9.9 KiB
C
/* $OpenBSD: getent.c,v 1.23 2021/10/11 14:28:26 deraadt Exp $ */
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/* $NetBSD: getent.c,v 1.7 2005/08/24 14:31:02 ginsbach Exp $ */
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/*-
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* Copyright (c) 2004 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Luke Mewburn.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <grp.h>
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#include <limits.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <net/if.h>
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#include <netinet/in.h> /* for INET6_ADDRSTRLEN */
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#include <netinet/if_ether.h>
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#include <arpa/inet.h>
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#include <rpc/rpc.h>
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static void usage(void);
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static int ethers(int, char *[]);
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static int group(int, char *[]);
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static int hosts(int, char *[]);
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static int passwd(int, char *[]);
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static int protocols(int, char *[]);
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static int rpc(int, char *[]);
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static int services(int, char *[]);
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static int shells(int, char *[]);
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extern char *__progname;
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enum {
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RV_OK = 0,
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RV_USAGE = 1,
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RV_NOTFOUND = 2,
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RV_NOENUM = 3
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};
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static struct getentdb {
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const char *name;
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int (*fn)(int, char *[]);
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const char *pledge;
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const char *unveil;
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} databases[] = {
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{ "ethers", ethers, "stdio rpath", "/etc/ethers" },
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{ "group", group, "stdio getpw", NULL },
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{ "hosts", hosts, "stdio dns", NULL },
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{ "passwd", passwd, "stdio getpw", NULL },
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{ "protocols", protocols, "stdio rpath", "/etc/protocols" },
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{ "rpc", rpc, "stdio rpath", "/etc/rpc" },
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{ "services", services, "stdio rpath", "/etc/services" },
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{ "shells", shells, "stdio rpath", "/etc/shells" },
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{ NULL, NULL, },
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};
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int
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main(int argc, char *argv[])
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{
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struct getentdb *curdb;
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if (argc < 2)
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usage();
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for (curdb = databases; curdb->name != NULL; curdb++) {
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if (strcmp(curdb->name, argv[1]) == 0) {
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if (curdb->unveil != NULL) {
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if (unveil(curdb->unveil, "r") == -1)
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err(1, "unveil %s", curdb->unveil);
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}
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if (pledge(curdb->pledge, NULL) == -1)
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err(1, "pledge");
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exit(curdb->fn(argc, argv));
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break;
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}
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}
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fprintf(stderr, "%s: unknown database: %s\n", __progname, argv[1]);
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return RV_USAGE;
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: %s database [key ...]\n", __progname);
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exit(RV_USAGE);
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}
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/*
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* printfmtstrings --
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* vprintf(format, ...),
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* then the aliases (beginning with prefix, separated by sep),
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* then a newline
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*/
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static void
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printfmtstrings(char *strings[], const char *prefix, const char *sep,
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const char *fmt, ...)
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{
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va_list ap;
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const char *curpref;
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int i;
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va_start(ap, fmt);
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vprintf(fmt, ap);
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va_end(ap);
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curpref = prefix;
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for (i = 0; strings[i] != NULL; i++) {
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printf("%s%s", curpref, strings[i]);
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curpref = sep;
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}
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printf("\n");
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}
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#define ETHERSPRINT printf("%-17s %s\n", ether_ntoa(eap), hp)
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static int
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ethers(int argc, char *argv[])
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{
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char hostname[HOST_NAME_MAX+1], *hp;
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int i, rv = RV_OK;
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struct ether_addr ea, *eap;
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if (argc == 2) {
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fprintf(stderr, "%s: Enumeration not supported on ethers\n",
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__progname);
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rv = RV_NOENUM;
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} else {
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for (i = 2; i < argc; i++) {
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if ((eap = ether_aton(argv[i])) == NULL) {
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eap = &ea;
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hp = argv[i];
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if (ether_hostton(hp, eap) != 0) {
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rv = RV_NOTFOUND;
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break;
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}
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} else {
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hp = hostname;
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if (ether_ntohost(hp, eap) != 0) {
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rv = RV_NOTFOUND;
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break;
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}
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}
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ETHERSPRINT;
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}
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}
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return rv;
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}
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#define GROUPPRINT \
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printfmtstrings(gr->gr_mem, ":", ",", "%s:%s:%u", \
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gr->gr_name, gr->gr_passwd, gr->gr_gid)
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static int
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group(int argc, char *argv[])
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{
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struct group *gr;
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const char *err;
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gid_t gid;
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int i, rv = RV_OK;
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setgroupent(1);
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if (argc == 2) {
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while ((gr = getgrent()) != NULL)
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GROUPPRINT;
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} else {
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for (i = 2; i < argc; i++) {
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if ((gr = getgrnam(argv[i])) == NULL) {
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gid = strtonum(argv[i], 0, GID_MAX, &err);
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if (err == NULL)
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gr = getgrgid(gid);
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}
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if (gr != NULL)
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GROUPPRINT;
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else {
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rv = RV_NOTFOUND;
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break;
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}
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}
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}
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endgrent();
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return rv;
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}
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static void
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hostsprint(const struct hostent *he)
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{
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char buf[INET6_ADDRSTRLEN];
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if (inet_ntop(he->h_addrtype, he->h_addr, buf, sizeof(buf)) == NULL)
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strlcpy(buf, "# unknown", sizeof(buf));
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printfmtstrings(he->h_aliases, " ", " ", "%-39s %s", buf, he->h_name);
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}
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static int
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hostsaddrinfo(const char *name)
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{
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struct addrinfo hints, *res, *res0;
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char buf[INET6_ADDRSTRLEN];
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int rv;
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rv = RV_NOTFOUND;
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memset(buf, 0, sizeof(buf));
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_DGRAM;
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if (getaddrinfo(name, NULL, &hints, &res0) != 0)
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return (rv);
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for (res = res0; res; res = res->ai_next) {
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if ((res->ai_family != AF_INET6 && res->ai_family != AF_INET) ||
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getnameinfo(res->ai_addr, res->ai_addrlen, buf, sizeof(buf),
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NULL, 0, NI_NUMERICHOST) != 0)
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strlcpy(buf, "# unknown", sizeof(buf));
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else
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rv = RV_OK;
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printf("%-39s %s\n", buf, name);
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}
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freeaddrinfo(res0);
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return (rv);
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}
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static int
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hosts(int argc, char *argv[])
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{
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struct in6_addr in6;
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struct in_addr in;
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int i, rv = RV_OK;
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struct hostent *he;
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if (argc == 2) {
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fprintf(stderr, "%s: Enumeration not supported on hosts\n",
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__progname);
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rv = RV_NOENUM;
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} else {
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for (i = 2; i < argc; i++) {
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he = NULL;
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if (inet_pton(AF_INET6, argv[i], (void *)&in6) > 0)
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he = gethostbyaddr(&in6, sizeof(in6), AF_INET6);
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else if (inet_pton(AF_INET, argv[i], (void *)&in) > 0)
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he = gethostbyaddr(&in, sizeof(in), AF_INET);
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if (he != NULL)
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hostsprint(he);
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else if ((rv = hostsaddrinfo(argv[i])) == RV_NOTFOUND)
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break;
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}
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}
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return rv;
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}
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#define PASSWDPRINT \
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printf("%s:%s:%u:%u:%s:%s:%s\n", \
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pw->pw_name, pw->pw_passwd, pw->pw_uid, \
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pw->pw_gid, pw->pw_gecos, pw->pw_dir, pw->pw_shell)
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static int
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passwd(int argc, char *argv[])
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{
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struct passwd *pw;
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const char *err;
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uid_t uid;
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int i, rv = RV_OK;
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setpassent(1);
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if (argc == 2) {
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while ((pw = getpwent()) != NULL)
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PASSWDPRINT;
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} else {
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for (i = 2; i < argc; i++) {
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if ((pw = getpwnam(argv[i])) == NULL) {
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uid = strtonum(argv[i], 0, UID_MAX, &err);
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if (err == NULL)
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pw = getpwuid(uid);
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}
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if (pw != NULL)
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PASSWDPRINT;
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else {
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rv = RV_NOTFOUND;
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break;
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}
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}
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}
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endpwent();
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return rv;
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}
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#define PROTOCOLSPRINT \
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printfmtstrings(pe->p_aliases, " ", " ", \
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"%-16s %5d", pe->p_name, pe->p_proto)
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static int
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protocols(int argc, char *argv[])
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{
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struct protoent *pe;
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const char *err;
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int proto;
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int i, rv = RV_OK;
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setprotoent(1);
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if (argc == 2) {
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while ((pe = getprotoent()) != NULL)
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PROTOCOLSPRINT;
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} else {
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for (i = 2; i < argc; i++) {
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proto = strtonum(argv[i], 0, INT_MAX, &err);
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if (!err)
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pe = getprotobynumber(proto);
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else
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pe = getprotobyname(argv[i]);
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if (pe != NULL)
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PROTOCOLSPRINT;
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else {
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rv = RV_NOTFOUND;
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break;
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}
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}
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}
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endprotoent();
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return rv;
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}
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#define RPCPRINT \
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printfmtstrings(re->r_aliases, " ", " ", \
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"%-16s %6d", re->r_name, re->r_number)
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static int
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rpc(int argc, char *argv[])
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{
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struct rpcent *re;
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const char *err;
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int rpc;
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int i, rv = RV_OK;
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setrpcent(1);
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if (argc == 2) {
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while ((re = getrpcent()) != NULL)
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RPCPRINT;
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} else {
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for (i = 2; i < argc; i++) {
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rpc = strtonum(argv[i], 0, INT_MAX, &err);
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if (!err)
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re = getrpcbynumber(rpc);
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else
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re = getrpcbyname(argv[i]);
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if (re != NULL)
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RPCPRINT;
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else {
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rv = RV_NOTFOUND;
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break;
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}
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}
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}
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endrpcent();
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return rv;
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}
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#define SERVICESPRINT \
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printfmtstrings(se->s_aliases, " ", " ", \
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"%-16s %5d/%s", se->s_name, ntohs(se->s_port), se->s_proto)
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static int
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services(int argc, char *argv[])
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{
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struct servent *se;
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const char *err;
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char *proto;
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in_port_t port;
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int i, rv = RV_OK;
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setservent(1);
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if (argc == 2) {
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while ((se = getservent()) != NULL)
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SERVICESPRINT;
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} else {
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for (i = 2; i < argc; i++) {
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if ((proto = strchr(argv[i], '/')) != NULL)
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*proto++ = '\0';
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port = strtonum(argv[i], 0, IPPORT_HILASTAUTO, &err);
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if (!err)
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se = getservbyport(htons(port), proto);
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else
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se = getservbyname(argv[i], proto);
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if (se != NULL)
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SERVICESPRINT;
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else {
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rv = RV_NOTFOUND;
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break;
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}
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}
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}
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endservent();
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return rv;
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}
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#define SHELLSPRINT printf("%s\n", sh)
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static int
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shells(int argc, char *argv[])
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{
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const char *sh;
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int i, rv = RV_OK;
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setusershell();
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if (argc == 2) {
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while ((sh = getusershell()) != NULL)
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SHELLSPRINT;
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} else {
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for (i = 2; i < argc; i++) {
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setusershell();
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while ((sh = getusershell()) != NULL) {
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if (strcmp(sh, argv[i]) == 0) {
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SHELLSPRINT;
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break;
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}
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}
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if (sh == NULL) {
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rv = RV_NOTFOUND;
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break;
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}
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}
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}
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endusershell();
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return rv;
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}
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