Annotation of embedaddon/sudo/plugins/sudoers/alias.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (c) 2004-2005, 2007-2011
3: * Todd C. Miller <Todd.Miller@courtesan.com>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
17: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
18: */
19:
20: #include <config.h>
21:
22: #include <sys/types.h>
23: #include <sys/param.h>
24: #include <stdio.h>
25: #ifdef STDC_HEADERS
26: # include <stdlib.h>
27: # include <stddef.h>
28: #else
29: # ifdef HAVE_STDLIB_H
30: # include <stdlib.h>
31: # endif
32: #endif /* STDC_HEADERS */
33: #ifdef HAVE_STRING_H
34: # include <string.h>
35: #endif /* HAVE_STRING_H */
36: #ifdef HAVE_STRINGS_H
37: # include <strings.h>
38: #endif /* HAVE_STRING_H */
39: #ifdef HAVE_UNISTD_H
40: # include <unistd.h>
41: #endif /* HAVE_UNISTD_H */
42: #include <errno.h>
43:
44: #include "sudoers.h"
45: #include "parse.h"
46: #include "redblack.h"
47: #include <gram.h>
48:
49: /*
50: * Globals
51: */
52: struct rbtree *aliases;
53: unsigned int alias_seqno;
54:
55: /*
56: * Comparison function for the red-black tree.
57: * Aliases are sorted by name with the type used as a tie-breaker.
58: */
59: int
60: alias_compare(const void *v1, const void *v2)
61: {
62: const struct alias *a1 = (const struct alias *)v1;
63: const struct alias *a2 = (const struct alias *)v2;
64: int res;
65:
66: if (v1 == NULL)
67: res = -1;
68: else if (v2 == NULL)
69: res = 1;
70: else if ((res = strcmp(a1->name, a2->name)) == 0)
71: res = a1->type - a2->type;
72: return res;
73: }
74:
75: /*
76: * Search the tree for an alias with the specified name and type.
77: * Returns a pointer to the alias structure or NULL if not found.
78: */
79: struct alias *
80: alias_find(char *name, int type)
81: {
82: struct alias key;
83: struct rbnode *node;
84: struct alias *a = NULL;
85:
86: key.name = name;
87: key.type = type;
88: if ((node = rbfind(aliases, &key)) != NULL) {
89: /*
90: * Compare the global sequence number with the one stored
91: * in the alias. If they match then we've seen this alias
92: * before and found a loop.
93: */
94: a = node->data;
95: if (a->seqno == alias_seqno) {
96: errno = ELOOP;
97: return NULL;
98: }
99: a->seqno = alias_seqno;
100: } else {
101: errno = ENOENT;
102: }
103: return a;
104: }
105:
106: /*
107: * Add an alias to the aliases redblack tree.
108: * Returns NULL on success and an error string on failure.
109: */
110: char *
111: alias_add(char *name, int type, struct member *members)
112: {
113: static char errbuf[512];
114: struct alias *a;
115:
116: a = emalloc(sizeof(*a));
117: a->name = name;
118: a->type = type;
119: a->seqno = 0;
120: list2tq(&a->members, members);
121: if (rbinsert(aliases, a)) {
122: snprintf(errbuf, sizeof(errbuf), _("Alias `%s' already defined"), name);
123: alias_free(a);
124: return errbuf;
125: }
126: return NULL;
127: }
128:
129: /*
130: * Apply a function to each alias entry and pass in a cookie.
131: */
132: void
133: alias_apply(int (*func)(void *, void *), void *cookie)
134: {
135: rbapply(aliases, func, cookie, inorder);
136: }
137:
138: /*
139: * Returns TRUE if there are no aliases, else FALSE.
140: */
141: int
142: no_aliases(void)
143: {
144: return rbisempty(aliases);
145: }
146:
147: /*
148: * Free memory used by an alias struct and its members.
149: */
150: void
151: alias_free(void *v)
152: {
153: struct alias *a = (struct alias *)v;
154: struct member *m;
155: struct sudo_command *c;
156: void *next;
157:
158: efree(a->name);
159: for (m = a->members.first; m != NULL; m = next) {
160: next = m->next;
161: if (m->type == COMMAND) {
162: c = (struct sudo_command *) m->name;
163: efree(c->cmnd);
164: efree(c->args);
165: }
166: efree(m->name);
167: efree(m);
168: }
169: efree(a);
170: }
171:
172: /*
173: * Find the named alias, remove it from the tree and return it.
174: */
175: struct alias *
176: alias_remove(char *name, int type)
177: {
178: struct rbnode *node;
179: struct alias key;
180:
181: key.name = name;
182: key.type = type;
183: if ((node = rbfind(aliases, &key)) == NULL) {
184: errno = ENOENT;
185: return NULL;
186: }
187: return rbdelete(aliases, node);
188: }
189:
190: void
191: init_aliases(void)
192: {
193: if (aliases != NULL)
194: rbdestroy(aliases, alias_free);
195: aliases = rbcreate(alias_compare);
196: }
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