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/**
* Copyright 2011 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Author: Nikki VonHollen <vonhollen@gmail.com>
*/
#ifndef NETGROUP_H_
#define NETGROUP_H_
#define NETGROUP_MAX_DEPTH 32
/**
* Netgroup with a name and list of entries.
*/
struct netgroup;
/**
* Entry in a netgroup, either a triple or sub-group (child).
*/
struct entry;
struct netgroup {
/* Next netgroup in list. */
struct netgroup *next; // Next netgroup in list
/* Netgroup name. */
char *name;
/* First entry in list of entries. */
struct entry *head;
};
struct entry {
/* Next entry in list of entries for the parent netgroup. */
struct entry *next;
/* Entry type is triple (host,user,domain) or child (netgroup name). */
enum {CHILD_ENTRY, TRIPLE_ENTRY} type;
union {
/* Child data if entry is a netgroup name. */
struct {
/* Child netgroup name. */
char *name;
/* Pointer to first entry in child netgroup. */
struct entry *head;
} child;
/* Triple data if entry type is triple. */
struct {
char *hostname;
char *username;
char *domainname;
} triple;
} data;
};
/* Recursive netgroup entry iterator. */
struct netgroup_iter {
struct entry *stack [NETGROUP_MAX_DEPTH];
int depth;
};
/**
* Load full netgroup database into memory.
* @return Head netgroup
*/
struct netgroup *netgroup_parse_all();
/**
* Free a list of netgroups.
* @param head Head of list of netgroups
*/
void netgroup_free_all(struct netgroup *head);
/**
* Parse a single netgroup.
* @param line Line for netgroup definition
* @return Single netgroup with list of netgroup entries
*/
struct netgroup *netgroup_parse_line(char *line);
/**
* Free single netgroup.
* @param group Netgroup to free
*/
void netgroup_free(struct netgroup *group);
/**
* Parse a single netgroup entry.
* @param value Entry triple or name as string
* @return Single netgroup entry
*/
struct entry *netgroup_parse_entry(const char *value);
/**
* Free a list of netgroup entries.
* @param head Head of list of entries
*/
void netgroup_entry_free_all(struct entry *head);
/**
* Free a single netgroup entry.
* @param entry Netgroup entry to free
*/
void netgroup_entry_free(struct entry *entry);
/**
* Find netgroup with given name.
* @param head Head of list of netgroups
* @param name Name to find
* @return Netgroup with name or NULL if not found
*/
struct netgroup *netgroup_find(struct netgroup *head, const char *name);
/**
* Create recursive iterator over all entries in a netgroup.
* @param iter Pointer to iterator struct
* @param group Group to iterate over
*/
void netgroup_iter_init(struct netgroup_iter *iter, struct netgroup *group);
/**
* Get the next entry in the netgroup iterator.
* @param iter Pointer to iterator struct
* @return Netgroup entry of type triple, or NULL if done iterating
*/
struct entry *netgroup_iter_next(struct netgroup_iter *iter);
#endif
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