File: [local] / src / usr.bin / getent / getent.c (download)
Revision 1.21, Fri Nov 2 10:21:29 2018 UTC (5 years, 7 months ago) by kn
Branch: MAIN
CVS Tags: OPENBSD_6_9_BASE, OPENBSD_6_9, OPENBSD_6_8_BASE, OPENBSD_6_8, OPENBSD_6_7_BASE, OPENBSD_6_7, OPENBSD_6_6_BASE, OPENBSD_6_6, OPENBSD_6_5_BASE, OPENBSD_6_5 Changes since 1.20: +11 -11 lines
Prefer user names over numeric user IDs
Behave like chown(8) to prevent clobbering user names which are numbers.
Prompted by and "this is how it should be" tedu, OK millert
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/* $OpenBSD: getent.c,v 1.21 2018/11/02 10:21:29 kn 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 <err.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 void 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 *[]);
const char *pledge;
const char *unveil;
} databases[] = {
{ "ethers", ethers, "stdio rpath", "/etc/ethers" },
{ "group", group, "stdio getpw", NULL },
{ "hosts", hosts, "stdio dns", NULL },
{ "passwd", passwd, "stdio getpw", NULL },
{ "protocols", protocols, "stdio rpath", "/etc/protocols" },
{ "rpc", rpc, "stdio rpath", "/etc/rpc" },
{ "services", services, "stdio rpath", "/etc/services" },
{ "shells", shells, "stdio rpath", "/etc/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) {
if (curdb->unveil != NULL) {
if (unveil(curdb->unveil, "r") == -1)
err(1, "unveil");
}
if (pledge(curdb->pledge, NULL) == -1)
err(1, "pledge");
exit(curdb->fn(argc, argv));
break;
}
}
fprintf(stderr, "%s: unknown database: %s\n", __progname, argv[1]);
return RV_USAGE;
}
static void
usage(void)
{
fprintf(stderr, "usage: %s database [key ...]\n", __progname);
exit(RV_USAGE);
}
/*
* 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[])
{
struct group *gr;
const char *err;
gid_t gid;
int i, rv = RV_OK;
setgroupent(1);
if (argc == 2) {
while ((gr = getgrent()) != NULL)
GROUPPRINT;
} else {
for (i = 2; i < argc; i++) {
if ((gr = getgrnam(argv[i])) == NULL) {
gid = strtonum(argv[i], 0, GID_MAX, &err);
if (err == NULL)
gr = getgrgid(gid);
}
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, " ", " ", "%-39s %s", buf, he->h_name);
}
static int
hostsaddrinfo(const char *name)
{
struct addrinfo hints, *res, *res0;
char buf[INET6_ADDRSTRLEN];
int rv;
rv = RV_NOTFOUND;
memset(buf, 0, sizeof(buf));
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
if (getaddrinfo(name, NULL, &hints, &res0) != 0)
return (rv);
for (res = res0; res; res = res->ai_next) {
if ((res->ai_family != AF_INET6 && res->ai_family != AF_INET) ||
getnameinfo(res->ai_addr, res->ai_addrlen, buf, sizeof(buf),
NULL, 0, NI_NUMERICHOST) != 0)
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[])
{
struct passwd *pw;
const char *err;
uid_t uid;
int i, rv = RV_OK;
setpassent(1);
if (argc == 2) {
while ((pw = getpwent()) != NULL)
PASSWDPRINT;
} else {
for (i = 2; i < argc; i++) {
if ((pw = getpwnam(argv[i])) == NULL) {
uid = strtonum(argv[i], 0, UID_MAX, &err);
if (err == NULL)
pw = getpwuid(uid);
}
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;
const char *err;
int proto;
int i, rv = RV_OK;
setprotoent(1);
if (argc == 2) {
while ((pe = getprotoent()) != NULL)
PROTOCOLSPRINT;
} else {
for (i = 2; i < argc; i++) {
proto = strtonum(argv[i], 0, INT_MAX, &err);
if (!err)
pe = getprotobynumber(proto);
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;
const char *err;
int rpc;
int i, rv = RV_OK;
setrpcent(1);
if (argc == 2) {
while ((re = getrpcent()) != NULL)
RPCPRINT;
} else {
for (i = 2; i < argc; i++) {
rpc = strtonum(argv[i], 0, INT_MAX, &err);
if (!err)
re = getrpcbynumber(rpc);
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;
const char *err;
char *proto;
in_port_t port;
int i, rv = RV_OK;
setservent(1);
if (argc == 2) {
while ((se = getservent()) != NULL)
SERVICESPRINT;
} else {
for (i = 2; i < argc; i++) {
if ((proto = strchr(argv[i], '/')) != NULL)
*proto++ = '\0';
port = strtonum(argv[i], 0, IPPORT_HILASTAUTO, &err);
if (!err)
se = getservbyport(htons(port), 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;
}