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- /*
- * Copyright (c) 1994 Swen Thuemmler <swen@uni-paderborn.de>
- *
- * 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. 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.
- */
-
-
- #include <ansidecl.h>
- #include <stddef.h>
- #include <ctype.h>
-
- #ifdef YP
- #include <rpcsvc/yp_prot.h>
- #include <rpcsvc/ypclnt.h>
-
- extern void setnetgrent(const char *);
- extern void endnetgrent(void);
- extern int getnetgrent(char **, char **, char **);
- extern int innetgr(const char *, const char *, const char *, const char *);
-
- struct netgrentry
- {
- char *host;
- char *user;
- char *domain;
- };
-
-
- struct netgrlist
- {
- int maxmembers;
- int members;
- struct netgrentry *list;
- };
-
-
- static void _expand_netgroupentry(const char *, struct netgrlist *);
- static void _parse_entry(char *, char *, struct netgrlist *);
- static void _netgr_free(struct netgrlist *);
- static struct netgrlist list = { 0, 0, NULL };
- static int first = 1;
- static char *netgroup = NULL ;
- static char *nisdomain = NULL ;
-
- void
- setnetgrent(const char *netgr)
- {
- if (NULL == netgroup || 0 != strcmp(netgroup, netgr))
- {
- endnetgrent();
- netgroup = strdup(netgr);
- _expand_netgroupentry(netgr, &list);
- }
- first = 1;
- }
-
- void
- endnetgrent(void)
- {
- if (NULL != netgroup)
- {
- free(netgroup);
- netgroup = NULL;
- }
-
- if (NULL != list.list)
- _netgr_free(&list);
- first = 1;
- }
-
- int
- getnetgrent(char **machinep, char **userp, char **domainp)
- {
- static int current = 0;
- struct netgrentry *entry;
-
- if (1 == first)
- current = first = 0;
- else
- current++;
-
- if (current < list.members)
- {
- entry = &list.list[current];
- *machinep = entry->host;
- *userp = entry->user;
- *domainp = entry->domain;
- return 1;
- }
- return 0;
- }
-
- int
- innetgr(const char *netgr, const char *host, const char *user, const char *domain)
- {
- struct netgrlist list = { 0, 0, NULL };
- struct netgrentry *entry;
- int current, status = 0;
-
- _expand_netgroupentry(netgr, &list);
- for (current = 0; current < list.members; current++)
- {
- entry = &list.list[current];
- /* This may look weired, but it is correct */
- status =
- ((NULL == host) ? 1 : ((NULL == entry->host) ? 1 : 0 == strcmp(host, entry->host)))
- && ((NULL == user) ? 1 : ((NULL == entry->user) ? 1 : 0 == strcmp(user, entry->user)))
- && ((NULL == domain) ? 1 : ((NULL == entry->domain) ? 1 : 0 == strcmp(domain, entry->domain)));
- if (1 == status)
- break;
- }
- if (NULL != list.list)
- _netgr_free(&list);
- return status;
- }
-
- static void
- _netgr_free(struct netgrlist *list)
- {
- int i;
- for (i = 0; i < list->members; i++)
- {
- free(list->list[i].host);
- free(list->list[i].user);
- free(list->list[i].domain);
- }
- free(list->list);
- list->maxmembers = 0;
- list->members = 0;
- list->list = NULL;
- }
-
- static void
- _expand_netgroupentry(const char *netgr, struct netgrlist *list)
- {
- char *outval;
- int outvallen, status;
- char *start, *end, *realend;
-
- if ('\0' == *netgr)
- return;
- if (1 == __yp_check(NULL))
- {
- if (NULL == nisdomain)
- yp_get_default_domain(&nisdomain);
- status = yp_match(nisdomain, "netgroup",
- netgr, strlen(netgr),
- &outval, &outvallen);
- if (0 != status)
- return ;
- /* outval enthaelt den Eintrag. Zuerst Leerzeichen ueberlesen */
- start = outval;
- realend = start + strlen(outval);
- while (isspace(*start) && start < realend)
- start++;
- while (start < realend)
- {
- if ( '(' == *start ) /* Eintrag gefunden */
- {
- end = strchr(start, ')') ;
- if (NULL == end)
- return ;
- _parse_entry(start + 1, end, list);
- }
- else
- {
- end = start + 1;
- while ('\0' != *end && !isspace(*end))
- end++;
- *end = '\0';
- _expand_netgroupentry(start, list);
- }
- start = end + 1 ;
- while (isspace(*start) && start < realend)
- start++;
- }
- free(outval);
- }
- }
-
- static void
- _parse_entry(char *start, char *end, struct netgrlist *list)
- {
- char *host, *user, *domain;
- struct netgrentry *entry;
- /* First split entry into fields. Return, when finding malformed entry */
- host = start ;
- start = strchr(host, ',') ;
- if (NULL == start || start >= end)
- return ;
- *start = '\0' ;
- user = start + 1 ;
- start = strchr(user, ',') ;
- if (NULL == start || start >= end)
- return ;
- *start = '\0';
- domain = start + 1;
- if (start > end)
- return ;
- *end = '\0' ;
- /* Entry is correctly formed, put it into the list */
- if (0 == list->maxmembers)
- {
- list->list = malloc(10 * sizeof(struct netgrentry));
- if ( NULL != list->list )
- list->maxmembers = 10 ;
- }
-
- if (list->members == list->maxmembers)
- {
- list->list = realloc(list->list,
- (list->maxmembers + 10) * sizeof(struct netgrentry));
- if (NULL == list->list)
- {
- list->maxmembers = 0;
- list->members = 0;
- return;
- }
- list->maxmembers += 10;
- }
- /*
- * FIXME: this will not handle entries of the form ( asdf, sdfa , asdf )
- * (note the spaces). This should be handled better!
- */
- entry = &list->list[list->members];
- entry->user = ('\0' == *user) ? NULL : strdup(user);
- entry->host = ('\0' == *host) ? NULL : strdup(host);
- entry->domain = ('\0' == *domain) ? NULL : strdup(domain);
- list->members++ ;
- return;
- }
-
- #else
-
- int
- getnetgrent(char **machinep, char **userp, char **domainp)
- {
- return 0;
- }
-
- void
- setnetgrent(char *netgroup)
- {
- return ;
- }
-
-
- void
- endnetgrent(void)
- {
- return ;
- }
-
- int
- innetgr(char *netgroup, char *machine, char *user, char *domain)
- {
- return 0;
- }
-
- #endif
-