#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: getent.c,v 1.21 2024/11/21 16:33:37 kre Exp $");
#endif
#include <sys/socket.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <grp.h>
#include <limits.h>
#include <netdb.h>
#include <netgroup.h>
#include <pwd.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/if_ether.h>
#include <netinet/in.h>
#include <rpc/rpcent.h>
#include <disktab.h>
static int usage(void) __attribute__((__noreturn__));
static int parsenum(const char *, unsigned long *);
static int disktab(int, char *[]);
static int gettytab(int, char *[]);
static int ethers(int, char *[]);
static int group(int, char *[]);
static int hosts(int, char *[]);
static int netgroup(int, char *[]);
static int networks(int, char *[]);
static int passwd(int, char *[]);
static int printcap(int, char *[]);
static int protocols(int, char *[]);
static int rpc(int, char *[]);
static int services(int, char *[]);
static int shells(int, char *[]);
enum {
RV_OK = 0,
RV_USAGE = 1,
RV_NOTFOUND = 2,
RV_NOENUM = 3
};
static struct getentdb {
const char *name;
int (*callback)(int, char *[]);
} databases[] = {
{ "disktab", disktab, },
{ "ethers", ethers, },
{ "gettytab", gettytab, },
{ "group", group, },
{ "hosts", hosts, },
{ "netgroup", netgroup, },
{ "networks", networks, },
{ "passwd", passwd, },
{ "printcap", printcap, },
{ "protocols", protocols, },
{ "rpc", rpc, },
{ "services", services, },
{ "shells", shells, },
{ NULL, NULL, },
};
int
main(int argc, char *argv[])
{
struct getentdb *curdb;
setprogname(argv[0]);
if (argc < 2)
usage();
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();
}
static int
usage(void)
{
struct getentdb *curdb;
size_t i;
(void)fprintf(stderr, "Usage: %s database [key ...]\n",
getprogname());
(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);
}
static int
parsenum(const char *word, unsigned long *result)
{
unsigned long num;
char *ep;
assert(word != NULL);
assert(result != NULL);
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;
}
static __printflike(4, 5) 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;
assert(argc > 1);
assert(argv != NULL);
#define ETHERSPRINT (void)printf("%-17s %s\n", ether_ntoa(eap), hp)
rv = RV_OK;
if (argc == 2) {
warnx("Enumeration not supported on ethers");
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;
}
static int
group(int argc, char *argv[])
{
struct group *gr;
unsigned long id;
int i, rv;
assert(argc > 1);
assert(argv != NULL);
#define GROUPPRINT printfmtstrings(gr->gr_mem, "", ",", "%s:%s:%u:", \
gr->gr_name, gr->gr_passwd, gr->gr_gid)
(void)setgroupent(1);
rv = RV_OK;
if (argc == 2) {
while ((gr = getgrent()) != NULL)
GROUPPRINT;
} 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)
GROUPPRINT;
else {
rv = RV_NOTFOUND;
break;
}
}
}
endgrent();
return rv;
}
static void
hostsprint(const struct hostent *he)
{
char buf[INET6_ADDRSTRLEN];
assert(he != NULL);
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;
assert(argc > 1);
assert(argv != NULL);
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)
hostsprint(he);
else {
rv = RV_NOTFOUND;
break;
}
}
}
endhostent();
return rv;
}
static int
netgroup(int argc, char *argv[])
{
int rv, i;
bool first;
const char *host, *user, *domain;
assert(argc > 1);
assert(argv != NULL);
#define NETGROUPPRINT(s) (((s) != NULL) ? (s) : "")
rv = RV_OK;
if (argc == 2) {
warnx("Enumeration not supported on netgroup");
rv = RV_NOENUM;
} else {
for (i = 2; i < argc; i++) {
setnetgrent(argv[i]);
first = true;
while (getnetgrent(&host, &user, &domain) != 0) {
if (first) {
first = false;
(void)fputs(argv[i], stdout);
}
(void)printf(" (%s,%s,%s)",
NETGROUPPRINT(host),
NETGROUPPRINT(user),
NETGROUPPRINT(domain));
}
if (!first)
(void)putchar('\n');
endnetgrent();
}
}
return rv;
}
static void
networksprint(const struct netent *ne)
{
char buf[INET6_ADDRSTRLEN];
struct in_addr ianet;
assert(ne != NULL);
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;
assert(argc > 1);
assert(argv != NULL);
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)
networksprint(ne);
else {
rv = RV_NOTFOUND;
break;
}
}
}
endnetent();
return rv;
}
static int
passwd(int argc, char *argv[])
{
struct passwd *pw;
unsigned long id;
int i, rv;
assert(argc > 1);
assert(argv != NULL);
#define PASSWDPRINT (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)
(void)setpassent(1);
rv = RV_OK;
if (argc == 2) {
while ((pw = getpwent()) != NULL)
PASSWDPRINT;
} 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)
PASSWDPRINT;
else {
rv = RV_NOTFOUND;
break;
}
}
}
endpwent();
return rv;
}
static char *
mygetent(const char * const * db_array, const char *name)
{
char *buf = NULL;
int error;
switch (error = cgetent(&buf, db_array, name)) {
case -3:
warnx("tc= loop in record `%s' in `%s'", name, db_array[0]);
break;
case -2:
warn("system error fetching record `%s' in `%s'", name,
db_array[0]);
break;
case -1:
case 0:
break;
case 1:
warnx("tc= reference not found in record for `%s' in `%s'",
name, db_array[0]);
break;
default:
warnx("unknown error %d in record `%s' in `%s'", error, name,
db_array[0]);
break;
}
return buf;
}
static char *
mygetone(const char * const * db_array, int first)
{
char *buf = NULL;
int error;
switch (error = (first ? cgetfirst : cgetnext)(&buf, db_array)) {
case -2:
warnx("tc= loop in `%s'", db_array[0]);
break;
case -1:
warn("system error fetching record in `%s'", db_array[0]);
break;
case 0:
case 1:
break;
case 2:
warnx("tc= reference not found in `%s'", db_array[0]);
break;
default:
warnx("unknown error %d in `%s'", error, db_array[0]);
break;
}
return buf;
}
static void
capprint(const char *cap)
{
char *c = strchr(cap, ':');
if (c)
if (c == cap)
(void)printf("true\n");
else {
int l = (int)(c - cap);
(void)printf("%*.*s\n", l, l, cap);
}
else
(void)printf("%s\n", cap);
}
static void
prettyprint(char *b)
{
#define TERMWIDTH 65
int did = 0;
size_t len;
char *s, c;
for (;;) {
len = strlen(b);
if (len <= TERMWIDTH) {
done:
if (did)
printf("\t:");
printf("%s\n", b);
return;
}
for (s = b + TERMWIDTH; s > b && *s != ':'; s--)
continue;
if (*s++ != ':')
goto done;
c = *s;
*s = '\0';
if (did)
printf("\t:");
did++;
printf("%s\\\n", b);
*s = c;
b = s;
}
}
static void
handleone(const char * const *db_array, char *b, int recurse, int pretty,
int level)
{
char *tc;
if (level && pretty)
printf("\n");
if (pretty)
prettyprint(b);
else
printf("%s\n", b);
if (!recurse || cgetstr(b, "tc", &tc) <= 0)
return;
b = mygetent(db_array, tc);
free(tc);
if (b == NULL)
return;
handleone(db_array, b, recurse, pretty, ++level);
free(b);
}
static int
handlecap(const char *db, int argc, char *argv[])
{
static const char sfx[] = "=#:";
const char *db_array[] = { db, NULL };
char *b, *cap;
int i, rv, c;
size_t j;
int expand = 1, recurse = 0, pretty = 0;
assert(argc > 1);
assert(argv != NULL);
argc--;
argv++;
while ((c = getopt(argc, argv, "pnr")) != -1)
switch (c) {
case 'n':
expand = 0;
break;
case 'r':
expand = 0;
recurse = 1;
break;
case 'p':
pretty = 1;
break;
default:
usage();
break;
}
argc -= optind;
argv += optind;
csetexpandtc(expand);
rv = RV_OK;
if (argc == 0) {
for (b = mygetone(db_array, 1); b; b = mygetone(db_array, 0)) {
handleone(db_array, b, recurse, pretty, 0);
free(b);
}
} else {
if ((b = mygetent(db_array, argv[0])) == NULL)
return RV_NOTFOUND;
if (argc == 1)
handleone(db_array, b, recurse, pretty, 0);
else {
for (i = 2; i < argc; i++) {
for (j = 0; j < sizeof(sfx) - 1; j++) {
cap = cgetcap(b, argv[i], sfx[j]);
if (cap) {
capprint(cap);
break;
}
}
if (j == sizeof(sfx) - 1)
printf("false\n");
}
}
free(b);
}
return rv;
}
static int
gettytab(int argc, char *argv[])
{
return handlecap(_PATH_GETTYTAB, argc, argv);
}
static int
printcap(int argc, char *argv[])
{
return handlecap(_PATH_PRINTCAP, argc, argv);
}
static int
disktab(int argc, char *argv[])
{
return handlecap(_PATH_DISKTAB, argc, argv);
}
static int
protocols(int argc, char *argv[])
{
struct protoent *pe;
unsigned long id;
int i, rv;
assert(argc > 1);
assert(argv != NULL);
#define PROTOCOLSPRINT printfmtstrings(pe->p_aliases, " ", " ", \
"%-16s %5d", pe->p_name, pe->p_proto)
setprotoent(1);
rv = RV_OK;
if (argc == 2) {
while ((pe = getprotoent()) != NULL)
PROTOCOLSPRINT;
} else {
for (i = 2; i < argc; i++) {
if (parsenum(argv[i], &id))
pe = getprotobynumber((int)id);
else
pe = getprotobyname(argv[i]);
if (pe != NULL)
PROTOCOLSPRINT;
else {
rv = RV_NOTFOUND;
break;
}
}
}
endprotoent();
return rv;
}
static int
rpc(int argc, char *argv[])
{
struct rpcent *re;
unsigned long id;
int i, rv;
assert(argc > 1);
assert(argv != NULL);
#define RPCPRINT printfmtstrings(re->r_aliases, " ", " ", \
"%-16s %6d", \
re->r_name, re->r_number)
setrpcent(1);
rv = RV_OK;
if (argc == 2) {
while ((re = getrpcent()) != NULL)
RPCPRINT;
} else {
for (i = 2; i < argc; i++) {
if (parsenum(argv[i], &id))
re = getrpcbynumber((int)id);
else
re = getrpcbyname(argv[i]);
if (re != NULL)
RPCPRINT;
else {
rv = RV_NOTFOUND;
break;
}
}
}
endrpcent();
return rv;
}
static int
services(int argc, char *argv[])
{
struct servent *se;
unsigned long id;
char *proto;
int i, rv;
assert(argc > 1);
assert(argv != NULL);
#define SERVICESPRINT printfmtstrings(se->s_aliases, " ", " ", \
"%-16s %5d/%s", \
se->s_name, ntohs(se->s_port), se->s_proto)
setservent(1);
rv = RV_OK;
if (argc == 2) {
while ((se = getservent()) != NULL)
SERVICESPRINT;
} 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)
SERVICESPRINT;
else {
rv = RV_NOTFOUND;
break;
}
}
}
endservent();
return rv;
}
static int
shells(int argc, char *argv[])
{
const char *sh;
int i, rv;
assert(argc > 1);
assert(argv != NULL);
#define SHELLSPRINT (void)printf("%s\n", sh)
setusershell();
rv = RV_OK;
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;
}
