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/*
* Copyright (c) 2004-2005, 2007-2010
* Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/param.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include "sudo.h"
#include "parse.h"
#include "redblack.h"
#include <gram.h>
/*
* Globals
*/
struct rbtree *aliases;
unsigned int alias_seqno;
/*
* Comparison function for the red-black tree.
* Aliases are sorted by name with the type used as a tie-breaker.
*/
int
alias_compare(v1, v2)
const void *v1, *v2;
{
const struct alias *a1 = (const struct alias *)v1;
const struct alias *a2 = (const struct alias *)v2;
int res;
if (v1 == NULL)
res = -1;
else if (v2 == NULL)
res = 1;
else if ((res = strcmp(a1->name, a2->name)) == 0)
res = a1->type - a2->type;
return(res);
}
/*
* Search the tree for an alias with the specified name and type.
* Returns a pointer to the alias structure or NULL if not found.
*/
struct alias *
alias_find(name, type)
char *name;
int type;
{
struct alias key;
struct rbnode *node;
struct alias *a = NULL;
key.name = name;
key.type = type;
if ((node = rbfind(aliases, &key)) != NULL) {
/*
* Compare the global sequence number with the one stored
* in the alias. If they match then we've seen this alias
* before and found a loop.
*/
a = node->data;
if (a->seqno == alias_seqno)
return(NULL);
a->seqno = alias_seqno;
}
return(a);
}
/*
* Add an alias to the aliases redblack tree.
* Returns NULL on success and an error string on failure.
*/
char *
alias_add(name, type, members)
char *name;
int type;
struct member *members;
{
static char errbuf[512];
struct alias *a;
a = emalloc(sizeof(*a));
a->name = name;
a->type = type;
a->seqno = 0;
list2tq(&a->members, members);
if (rbinsert(aliases, a)) {
snprintf(errbuf, sizeof(errbuf), "Alias `%s' already defined", name);
alias_free(a);
return(errbuf);
}
return(NULL);
}
/*
* Apply a function to each alias entry and pass in a cookie.
*/
void
alias_apply(func, cookie)
int (*func) __P((void *, void *));
void *cookie;
{
rbapply(aliases, func, cookie, inorder);
}
/*
* Returns TRUE if there are no aliases, else FALSE.
*/
int
no_aliases()
{
return(rbisempty(aliases));
}
/*
* Free memory used by an alias struct and its members.
*/
void
alias_free(v)
void *v;
{
struct alias *a = (struct alias *)v;
struct member *m;
struct sudo_command *c;
void *next;
efree(a->name);
for (m = a->members.first; m != NULL; m = next) {
next = m->next;
if (m->type == COMMAND) {
c = (struct sudo_command *) m->name;
efree(c->cmnd);
efree(c->args);
}
efree(m->name);
efree(m);
}
efree(a);
}
/*
* Find the named alias, remove it from the tree and return it.
*/
struct alias *
alias_remove(name, type)
char *name;
int type;
{
struct rbnode *node;
struct alias key, *a;
key.name = name;
key.type = type;
if ((node = rbfind(aliases, &key)) == NULL)
return(NULL);
a = rbdelete(aliases, node);
return(a);
}
void
init_aliases()
{
if (aliases != NULL)
rbdestroy(aliases, alias_free);
aliases = rbcreate(alias_compare);
}
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