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NetBSD/lib/libc/gen/getnetgrent.c

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/* $NetBSD: getnetgrent.c,v 1.9 1996/04/27 18:59:05 christos Exp $ */
/*
* Copyright (c) 1994 Christos Zoulas
* All rights reserved.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christos Zoulas.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char *rcsid = "$NetBSD: getnetgrent.c,v 1.9 1996/04/27 18:59:05 christos Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <stdio.h>
#define _NETGROUP_PRIVATE
#include <netgroup.h>
#include <string.h>
#include <fcntl.h>
#include <err.h>
#include <ctype.h>
#include <stdlib.h>
#include <db.h>
#define _NG_STAR(s) (((s) == NULL || *(s) == '\0') ? _ngstar : s)
#define _NG_EMPTY(s) ((s) == NULL ? "" : s)
#define _NG_ISSPACE(p) (isspace((unsigned char) (p)) || (p) == '\n')
static const char _ngstar[] = "*";
static const char _ngoomem[] = "netgroup: %m";
static struct netgroup *_nghead = (struct netgroup *)NULL;
static struct netgroup *_nglist = (struct netgroup *)NULL;
static DB *_ng_db;
/*
* Simple string list
*/
struct stringlist {
char **sl_str;
size_t sl_max;
size_t sl_cur;
};
static int getstring __P((char **, int, char **));
static struct netgroup *getnetgroup __P((char **));
static int lookup __P((const char *, char *, char **, int));
static void addgroup __P((char *, struct stringlist *, char *));
static int in_check __P((const char *, const char *,
const char *, struct netgroup *));
static int in_find __P((char *, struct stringlist *,
char *, const char *,
const char *, const char *));
static char *in_lookup1 __P((const char *, const char *,
const char *, int));
static int in_lookup __P((const char *, const char *,
const char *, const char *, int));
/*
* _ng_sl_init(): Initialize a string list
*/
struct stringlist *
_ng_sl_init()
{
struct stringlist *sl = malloc(sizeof(struct stringlist));
if (sl == NULL)
_err(1, _ngoomem);
sl->sl_cur = 0;
sl->sl_max = 20;
sl->sl_str = malloc(sl->sl_max * sizeof(char *));
if (sl->sl_str == NULL)
_err(1, _ngoomem);
return sl;
}
/*
* _ng_sl_add(): Add an item to the string list
*/
void
_ng_sl_add(sl, name)
struct stringlist *sl;
char *name;
{
if (sl->sl_cur == sl->sl_max - 1) {
sl->sl_max += 20;
sl->sl_str = realloc(sl->sl_str, sl->sl_max * sizeof(char *));
if (sl->sl_str == NULL)
_err(1, _ngoomem);
}
sl->sl_str[sl->sl_cur++] = name;
}
/*
* _ng_sl_free(): Free a stringlist
*/
void
_ng_sl_free(sl, all)
struct stringlist *sl;
int all;
{
size_t i;
if (all)
for (i = 0; i < sl->sl_cur; i++)
free(sl->sl_str[i]);
free(sl->sl_str);
free(sl);
}
/*
* sl_find(): Find a name in the string list
*/
char *
_ng_sl_find(sl, name)
struct stringlist *sl;
char *name;
{
size_t i;
for (i = 0; i < sl->sl_cur; i++)
if (strcmp(sl->sl_str[i], name) == 0)
return sl->sl_str[i];
return NULL;
}
/*
* getstring(): Get a string delimited by the character, skipping leading and
* trailing blanks and advancing the pointer
*/
static int
getstring(pp, del, str)
char **pp;
int del;
char **str;
{
char *sp, *ep, *dp;
/* skip leading blanks */
for (sp = *pp; *sp && _NG_ISSPACE(*sp); sp++)
continue;
/* accumulate till delimiter or space */
for (ep = sp; *ep && *ep != del && !_NG_ISSPACE(*ep); ep++)
continue;
/* hunt for the delimiter */
for (dp = ep; *dp && *dp != del && _NG_ISSPACE(*dp); dp++)
continue;
if (*dp != del) {
*str = NULL;
return 0;
}
*pp = ++dp;
del = (ep - sp) + 1;
if (del > 1) {
dp = malloc(del);
if (dp == NULL)
_err(1, _ngoomem);
memcpy(dp, sp, del);
dp[del - 1] = '\0';
} else
dp = NULL;
*str = dp;
return 1;
}
/*
* getnetgroup(): Parse a netgroup, and advance the pointer
*/
static struct netgroup *
getnetgroup(pp)
char **pp;
{
struct netgroup *ng = malloc(sizeof(struct netgroup));
if (ng == NULL)
_err(1, _ngoomem);
(*pp)++; /* skip '(' */
if (!getstring(pp, ',', &ng->ng_host))
goto badhost;
if (!getstring(pp, ',', &ng->ng_user))
goto baduser;
if (!getstring(pp, ')', &ng->ng_domain))
goto baddomain;
#ifdef DEBUG_NG
{
char buf[1024];
(void) fprintf(stderr, "netgroup %s\n",
_ng_print(buf, sizeof(buf), ng));
}
#endif
return ng;
baddomain:
if (ng->ng_user)
free(ng->ng_user);
baduser:
if (ng->ng_host)
free(ng->ng_host);
badhost:
free(ng);
return NULL;
}
/*
* lookup(): Find the given key in the database or yp, and return its value
* in *line; returns 1 if key was found, 0 otherwise
*/
static int
lookup(ypdom, name, line, bywhat)
const char *ypdom;
char *name;
char **line;
int bywhat;
{
#ifdef YP
int i;
char *map = NULL;
#endif
if (_ng_db) {
DBT key, data;
size_t len = strlen(name) + 2;
char *ks = malloc(len);
ks[0] = bywhat;
memcpy(&ks[1], name, len - 1);
key.data = (u_char *) ks;
key.size = len;
switch ((_ng_db->get) (_ng_db, &key, &data, 0)) {
case 0:
free(ks);
*line = strdup(data.data);
if (*line == NULL)
_err(1, _ngoomem);
return 1;
case 1:
break;
case -1:
_warn("netgroup: db get");
break;
}
free(ks);
}
#ifdef YP
if (ypdom) {
switch (bywhat) {
case _NG_KEYBYNAME:
map = "netgroup";
break;
case _NG_KEYBYUSER:
map = "netgroup.byuser";
break;
case _NG_KEYBYHOST:
map = "netgroup.byhost";
break;
default:
abort();
break;
}
if (yp_match(ypdom, map, name, strlen(name), line, &i) == 0)
return 1;
}
#endif
return 0;
}
/*
* _ng_parse(): Parse a line and return: _NG_ERROR: Syntax Error _NG_NONE:
* line was empty or a comment _NG_GROUP: line had a netgroup definition,
* returned in ng _NG_NAME: line had a netgroup name, returned in name
*
* Public since used by netgroup_mkdb
*/
int
_ng_parse(p, name, ng)
char **p;
char **name;
struct netgroup **ng;
{
while (**p) {
if (**p == '#')
/* comment */
return _NG_NONE;
while (**p && _NG_ISSPACE(**p))
/* skipblank */
(*p)++;
if (**p == '(') {
if ((*ng = getnetgroup(p)) == NULL) {
_warnx("netgroup: Syntax error `%s'", *p);
return _NG_ERROR;
}
return _NG_GROUP;
} else {
char *np;
int i;
for (np = *p; **p && !_NG_ISSPACE(**p); (*p)++)
continue;
if (np != *p) {
i = (*p - np) + 1;
*name = malloc(i);
if (*name == NULL)
_err(1, _ngoomem);
memcpy(*name, np, i);
(*name)[i - 1] = '\0';
return _NG_NAME;
}
}
}
return _NG_NONE;
}
/*
* addgroup(): Recursively add all the members of the netgroup to this group
*/
static void
addgroup(ypdom, sl, grp)
char *ypdom;
struct stringlist *sl;
char *grp;
{
char *line, *p;
struct netgroup *ng;
char *name;
#ifdef DEBUG_NG
(void) fprintf(stderr, "addgroup(%s)\n", grp);
#endif
/* check for cycles */
if (_ng_sl_find(sl, grp) != NULL) {
free(grp);
_warnx("netgroup: Cycle in group `%s'", grp);
return;
}
_ng_sl_add(sl, grp);
/* Lookup this netgroup */
if (!lookup(ypdom, grp, &line, _NG_KEYBYNAME))
return;
p = line;
for (;;) {
switch (_ng_parse(&p, &name, &ng)) {
case _NG_NONE:
/* Done with the line */
free(line);
return;
case _NG_GROUP:
/* new netgroup */
/* add to the list */
ng->ng_next = _nglist;
_nglist = ng;
break;
case _NG_NAME:
/* netgroup name */
addgroup(ypdom, sl, name);
break;
case _NG_ERROR:
return;
default:
abort();
return;
}
}
}
/*
* in_check(): Compare the spec with the netgroup
*/
static int
in_check(host, user, domain, ng)
const char *host;
const char *user;
const char *domain;
struct netgroup *ng;
{
if ((host != NULL) && (ng->ng_host != NULL)
&& strcmp(ng->ng_host, host) != 0)
return 0;
if ((user != NULL) && (ng->ng_user != NULL)
&& strcmp(ng->ng_user, user) != 0)
return 0;
if ((domain != NULL) && (ng->ng_domain != NULL)
&& strcmp(ng->ng_domain, domain) != 0)
return 0;
return 1;
}
/*
* in_find(): Find a match for the host, user, domain spec
*/
static int
in_find(ypdom, sl, grp, host, user, domain)
char *ypdom;
struct stringlist *sl;
char *grp;
const char *host;
const char *user;
const char *domain;
{
char *line, *p;
int i;
struct netgroup *ng;
char *name;
#ifdef DEBUG_NG
(void) fprintf(stderr, "in_find(%s)\n", grp);
#endif
/* check for cycles */
if (_ng_sl_find(sl, grp) != NULL) {
free(grp);
_warnx("netgroup: Cycle in group `%s'", grp);
return 0;
}
_ng_sl_add(sl, grp);
/* Lookup this netgroup */
if (!lookup(ypdom, grp, &line, _NG_KEYBYNAME))
return 0;
p = line;
for (;;) {
switch (_ng_parse(&p, &name, &ng)) {
case _NG_NONE:
/* Done with the line */
free(line);
return 0;
case _NG_GROUP:
/* new netgroup */
i = in_check(host, user, domain, ng);
if (ng->ng_host != NULL)
free(ng->ng_host);
if (ng->ng_user != NULL)
free(ng->ng_user);
if (ng->ng_domain != NULL)
free(ng->ng_domain);
free(ng);
if (i) {
free(line);
return 1;
}
break;
case _NG_NAME:
/* netgroup name */
if (in_find(ypdom, sl, name, host, user, domain)) {
free(line);
return 1;
}
break;
case _NG_ERROR:
free(line);
return 0;
default:
abort();
return 0;
}
}
}
/*
* _ng_makekey(): Make a key from the two names given. The key is of the form
* <name1>.<name2> Names strings are replaced with * if they are empty;
*/
char *
_ng_makekey(s1, s2, len)
const char *s1, *s2;
size_t len;
{
char *buf = malloc(len);
if (buf == NULL)
_err(1, _ngoomem);
(void) snprintf(buf, len, "%s.%s", _NG_STAR(s1), _NG_STAR(s2));
return buf;
}
void
_ng_print(buf, len, ng)
char *buf;
size_t len;
const struct netgroup *ng;
{
(void) snprintf(buf, len, "(%s,%s,%s)", _NG_EMPTY(ng->ng_host),
_NG_EMPTY(ng->ng_user), _NG_EMPTY(ng->ng_domain));
}
/*
* in_lookup1(): Fast lookup for a key in the appropriate map
*/
static char *
in_lookup1(ypdom, key, domain, map)
const char *ypdom;
const char *key;
const char *domain;
int map;
{
char *line;
size_t len;
char *ptr;
int res;
len = (key ? strlen(key) : 1) + (domain ? strlen(domain) : 1) + 2;
ptr = _ng_makekey(key, domain, len);
res = lookup(ypdom, ptr, &line, map);
free(ptr);
return res ? line : NULL;
}
/*
* in_lookup(): Fast lookup for a key in the appropriate map
*/
static int
in_lookup(ypdom, group, key, domain, map)
const char *ypdom;
const char *group;
const char *key;
const char *domain;
int map;
{
size_t len;
char *ptr, *line;
if (domain != NULL) {
/* Domain specified; look in "group.domain" and "*.domain" */
if ((line = in_lookup1(ypdom, key, domain, map)) == NULL)
line = in_lookup1(ypdom, NULL, domain, map);
}
else
line = NULL;
if (line == NULL) {
/*
* domain not specified or domain lookup failed; look in
* "group.*" and "*.*"
*/
if (((line = in_lookup1(ypdom, key, NULL, map)) == NULL) &&
((line = in_lookup1(ypdom, NULL, NULL, map)) == NULL))
return 0;
}
len = strlen(group);
for (ptr = line; (ptr = strstr(ptr, group)) != NULL;)
/* Make sure we did not find a substring */
if ((ptr != line && ptr[-1] != ',') ||
(ptr[len] != '\0' && strchr("\n\t ,", ptr[len]) == NULL))
ptr++;
else {
free(line);
return 1;
}
free(line);
return 0;
}
void
endnetgrent()
{
for (_nglist = _nghead; _nglist != NULL; _nglist = _nghead) {
_nghead = _nglist->ng_next;
if (_nglist->ng_host != NULL)
free(_nglist->ng_host);
if (_nglist->ng_user != NULL)
free(_nglist->ng_user);
if (_nglist->ng_domain != NULL)
free(_nglist->ng_domain);
free(_nglist);
}
if (_ng_db) {
(void) (_ng_db->close) (_ng_db);
_ng_db = NULL;
}
}
void
setnetgrent(ng)
const char *ng;
{
struct stringlist *sl = _ng_sl_init();
#ifdef YP
char *line;
#endif
char *ng_copy, *ypdom = NULL;
/* Cleanup any previous storage */
if (_nghead != NULL)
endnetgrent();
if (_ng_db == NULL)
_ng_db = dbopen(_PATH_NETGROUP_DB, O_RDONLY, 0, DB_HASH, NULL);
#ifdef YP
/*
* We use yp if there is a "+" in the netgroup file, or if there is
* no netgroup file at all
*/
if (_ng_db == NULL || lookup(NULL, "+", &line, _NG_KEYBYNAME) == 0)
yp_get_default_domain(&ypdom);
else
free(line);
#endif
ng_copy = strdup(ng);
if (ng_copy == NULL)
_err(1, _ngoomem);
addgroup(ypdom, sl, ng_copy);
_nghead = _nglist;
_ng_sl_free(sl, 1);
}
int
getnetgrent(host, user, domain)
const char **host;
const char **user;
const char **domain;
{
if (_nglist == NULL)
return 0;
*host = _nglist->ng_host;
*user = _nglist->ng_user;
*domain = _nglist->ng_domain;
_nglist = _nglist->ng_next;
return 1;
}
int
innetgr(grp, host, user, domain)
const char *grp, *host, *user, *domain;
{
char *ypdom = NULL;
#ifdef YP
char *line;
#endif
int found;
struct stringlist *sl;
if (_ng_db == NULL)
_ng_db = dbopen(_PATH_NETGROUP_DB, O_RDONLY, 0, DB_HASH, NULL);
#ifdef YP
/*
* We use yp if there is a "+" in the netgroup file, or if there is
* no netgroup file at all
*/
if (_ng_db == NULL)
yp_get_default_domain(&ypdom);
else if (lookup(NULL, "+", &line, _NG_KEYBYNAME) == 0) {
yp_get_default_domain(&ypdom);
free(line);
}
#endif
/* Try the fast lookup first */
if (host != NULL && user == NULL) {
if (in_lookup(ypdom, grp, host, domain, _NG_KEYBYHOST))
return 1;
} else if (host == NULL && user != NULL) {
if (in_lookup(ypdom, grp, user, domain, _NG_KEYBYUSER))
return 1;
}
/* If a domainname is given, we would have found a match */
if (domain != NULL)
return 0;
/* Too bad need the slow recursive way */
sl = _ng_sl_init();
found = in_find(ypdom, sl, strdup(grp), host, user, domain);
_ng_sl_free(sl, 1);
return found;
}
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