void-packages/srcpkgs/musl/files/getent.c

437 lines
9.2 KiB
C

/*-
* 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 */
}