+++ /dev/null
-/* -*-c-*-
- *
- * $Id$
- *
- * Encoding and decoding of key data
- *
- * (c) 1999 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of Catacomb.
- *
- * Catacomb is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * Catacomb is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with Catacomb; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <mLib/base64.h>
-#include <mLib/bits.h>
-#include <mLib/dstr.h>
-#include <mLib/sub.h>
-#include <mLib/sym.h>
-
-#include "key-data.h"
-#include "mp.h"
-#include "mptext.h"
-
-/*----- Reference counting stuff ------------------------------------------*/
-
-/* --- @key_incref@ --- *
- *
- * Arguments: @key_data *k@ = pointer to key data
- *
- * Returns: ---
- *
- * Use: Increments the refcount on a key data block.
- */
-
-void key_incref(key_data *k) { KEY_INCREF(k); }
-
-/* --- @key_destroy@ --- *
- *
- * Arguments: @key_data *k@ = pointer to key data to destroy
- *
- * Returns: ---
- *
- * Use: Destroys a block of key data, regardless of reference count.
- * Don't use this unless you know what you're doing.
- */
-
-void key_destroy(key_data *k)
-{
- switch (k->e & KF_ENCMASK) {
- case KENC_BINARY:
- case KENC_ENCRYPT:
- if (k->u.k.k) {
- if (k->e & KF_BURN)
- memset(k->u.k.k, 0, k->u.k.sz);
- sub_free(k->u.k.k, k->u.k.sz);
- }
- break;
- case KENC_MP:
- mp_drop(k->u.m);
- break;
- case KENC_STRING:
- xfree(k->u.p);
- break;
- case KENC_EC:
- EC_DESTROY(&k->u.e);
- break;
- case KENC_STRUCT: {
- key_data *kd;
- key_subkeyiter i;
-
- for (key_mksubkeyiter(&i, k); key_nextsubkey(&i, 0, &kd); )
- KEY_DROP(kd);
- sym_destroy(&k->u.s);
- } break;
- default:
- abort();
- }
- DESTROY(k);
-}
-
-/* --- @key_drop@ --- *
- *
- * Arguments: @key_data *k@ = pointer to key data to destroy
- *
- * Returns: ---
- *
- * Use: Drops a reference to key data, destroying it if necessary.
- */
-
-void key_drop(key_data *k) { KEY_DROP(k); }
-
-/* --- @key_split@ --- *
- *
- * Arguments: @key_data **kk@ = address of pointer to key data block
- *
- * Returns: ---
- *
- * Use: Replaces @*kk@ with a pointer to the same key data, but with
- * just one reference.
- */
-
-void key_split(key_data **kk)
-{
- key_data *k = *kk;
-
- if (k->ref == 1)
- return;
- switch (k->e & KF_ENCMASK) {
- case KENC_BINARY:
- *kk = key_newbinary(k->e, k->u.k.k, k->u.k.sz);
- break;
- case KENC_ENCRYPT:
- *kk = key_newencrypted(k->e, k->u.k.k, k->u.k.sz);
- break;
- case KENC_MP:
- *kk = key_newmp(k->e, k->u.m);
- break;
- case KENC_STRING:
- *kk = key_newstring(k->e, k->u.p);
- break;
- case KENC_EC:
- *kk = key_newec(k->e, &k->u.e);
- break;
- case KENC_STRUCT: {
- key_subkeyiter i;
- const char *tag;
- key_data *kd;
-
- *kk = key_newstruct();
- for (key_mksubkeyiter(&i, k); key_nextsubkey(&i, &tag, &kd); )
- key_structset(*kk, tag, kd);
- } break;
- default:
- abort();
- }
-}
-
-/*----- Setting new values ------------------------------------------------*/
-
-/* --- @key_newraw@ --- *
- *
- * Arguments: @unsigned e@ = encoding type to set
- *
- * Returns: New key block, not filled in.
- */
-
-key_data *key_newraw(unsigned e)
-{
- key_data *k = CREATE(key_data);
- k->e = e;
- k->ref = 1;
- return (k);
-}
-
-/* --- @key_newbinary@ --- *
- *
- * Arguments: @unsigned e@ = other encoding flags
- * @const void *p@ = pointer to key data
- * @size_t sz@ = size of the key data
- *
- * Returns: New key data object.
- */
-
-key_data *key_newbinary(unsigned e, const void *p, size_t sz)
-{
- key_data *k = key_newraw(KENC_BINARY | e);
- k->u.k.k = sub_alloc(sz);
- memcpy(k->u.k.k, p, sz);
- k->u.k.sz = sz;
- return (k);
-}
-
-/* --- @key_newencrypted@ --- *
- *
- * Arguments: @unsigned e@ = other encoding flags
- * @const void *p@ = pointer to key data
- * @size_t sz@ = size of the key data
- *
- * Returns: New key data object.
- */
-
-key_data *key_newencrypted(unsigned e, const void *p, size_t sz)
-{
- key_data *k = key_newraw(KENC_ENCRYPT | e);
- k->u.k.k = sub_alloc(sz);
- memcpy(k->u.k.k, p, sz);
- k->u.k.sz = sz;
- return (k);
-}
-
-/* --- @key_newmp@ --- *
- *
- * Arguments: @unsigned e@ = other encoding flags
- * @mp *m@ = pointer to the value to set
- *
- * Returns: New key data object.
- */
-
-key_data *key_newmp(unsigned e, mp *m)
-{
- key_data *k = key_newraw(KENC_MP | e);
- k->u.m = MP_COPY(m);
- return (k);
-}
-
-/* --- @key_newstring@ --- *
- *
- * Arguments: @unsigned e@ = other encoding flags
- * @const char *p@ = pointer to the value to set
- *
- * Returns: New key data object.
- */
-
-key_data *key_newstring(unsigned e, const char *p)
-{
- key_data *k = key_newraw(KENC_STRING | e);
- k->u.p = xstrdup(p);
- return (k);
-}
-
-/* --- @key_newec@ --- *
- *
- * Arguments: @unsigned e@ = other encoding flags
- * @const ec *pt@ = pointer to the value to set
- *
- * Returns: New key data object.
- */
-
-key_data *key_newec(unsigned e, const ec *pt)
-{
- key_data *k = key_newraw(KENC_EC | e);
- EC_CREATE(&k->u.e);
- EC_COPY(&k->u.e, pt);
- return (k);
-}
-
-/* --- @key_newstruct@ --- *
- *
- * Arguments: ---
- *
- * Returns: New key data object.
- */
-
-key_data *key_newstruct(void)
-{
- key_data *k = key_newraw(KENC_STRUCT);
- sym_create(&k->u.s);
- return (k);
-}
-
-/* --- @key_structfind@ --- *
- *
- * Arguments: @key_data *k@ = pointer to key data block
- * @const char *tag@ = pointer to tag string
- *
- * Returns: Pointer to key data block, or null.
- *
- * Use: Looks up the tag in a structured key.
- */
-
-key_data *key_structfind(key_data *k, const char *tag)
-{
- key_struct *ks;
- assert(((void)"Key is not structured",
- (k->e & KF_ENCMASK) == KENC_STRUCT));
- ks = sym_find(&k->u.s, tag, -1, 0, 0);
- if (!ks)
- return (0);
- return (ks->k);
-}
-
-/* --- @key_mksubkeyiter@ --- *
- *
- * Arguments: @key_subkeyiter *i@ = pointer to iterator block
- * @key_data *k@ = pointer to key data block
- *
- * Returns: ---
- *
- * Use: Initializes a subkey iterator.
- */
-
-void key_mksubkeyiter(key_subkeyiter *i, key_data *k)
-{
- assert(((void)"Key is not structured",
- (k->e & KF_ENCMASK) == KENC_STRUCT));
- sym_mkiter(&i->i, &k->u.s);
-}
-
-/* --- @key_nextsubkey@ --- *
- *
- * Arguments: @key_structiter *i@ = pointer to iterator block
- * @const char **tag@ = where to put the tag pointer, or null
- * @key_data **kd@ = where to put the key data pointer, or null
- *
- * Returns: Nonzero if there was another item, zero if we hit the
- * end-stop.
- *
- * Use: Collects the next subkey of a structured key.
- */
-
-int key_nextsubkey(key_subkeyiter *i, const char **tag, key_data **kd)
-{
- key_struct *ks;
-
- if ((ks = sym_next(&i->i)) == 0)
- return (0);
- if (tag) *tag = SYM_NAME(ks);
- if (kd) *kd = ks->k;
- return (1);
-}
-
-/* --- @key_structset@, @key_structsteal@ --- *
- *
- * Arguments: @key_data *k@ = pointer to key data block
- * @const char *tag@ = pointer to tag string
- * @key_data *kd@ = new key data to store
- *
- * Returns: ---
- *
- * Use: Creates a new subkey. Stealing doesn't affect @kd@'s
- * refcount. If @kd@ is null, the subkey is deleted.
- */
-
-static void structset(key_data *k, int stealp,
- const char *tag, key_data *kd)
-{
- key_struct *ks;
- unsigned f;
-
- assert(((void)"Key is not structured", k->e == KENC_STRUCT));
- assert(((void)"Key has multiple references", k->ref == 1));
- if (!kd) {
- ks = sym_find(&k->u.s, tag, -1, 0, 0);
- if (ks) sym_remove(&k->u.s, ks);
- } else {
- ks = sym_find(&k->u.s, tag, -1, sizeof(*ks), &f);
- if (f)
- key_drop(ks->k);
- if (!stealp) KEY_INCREF(kd);
- ks->k = kd;
- }
-}
-
-void key_structset(key_data *k, const char *tag, key_data *kd)
- { structset(k, 0, tag, kd); }
-void key_structsteal(key_data *k, const char *tag, key_data *kd)
- { structset(k, 1, tag, kd); }
-
-/*----- Miscellaneous operations ------------------------------------------*/
-
-/* --- @key_do@ --- *
- *
- * Arguments: @key_data *k@ = pointer to key data block
- * @const key_filter *kf@ = pointer to filter block
- * @dstr *d@ = pointer to base string
- * @int (*func)(key_data *kd, dstr *d, void *p@ = function
- * @void *p@ = argument to function
- *
- * Returns: Nonzero return code from function, or zero.
- *
- * Use: Runs a function over all the leaves of a key.
- */
-
-int key_do(key_data *k, const key_filter *kf, dstr *d,
- int (*func)(key_data */*kd*/, dstr */*d*/, void */*p*/),
- void *p)
-{
- if (!KEY_MATCH(k, kf))
- return (0);
- if ((k->e & KF_ENCMASK) != KENC_STRUCT)
- return (func(k, d, p));
- else {
- key_subkeyiter i;
- const char *tag;
- size_t n = 0;
- int rc;
-
- if (d)
- n = d->len;
- for (key_mksubkeyiter(&i, k); key_nextsubkey(&i, &tag, &k); ) {
- if (d) {
- d->len = n;
- dstr_putf(d, ".%s", tag);
- }
- if ((rc = key_do(k, kf, d, func, p)) != 0)
- return (rc);
- }
- return (0);
- }
-}
-
-/* --- @key_copydata@ --- *
- *
- * Arguments: @key_data *k@ = key data to copy
- * @const key_filter *kf@ = pointer to filter block
- *
- * Returns: Pointer to a copy of the data, or null if the root subkey
- * didn't match the filter.
- *
- * Use: Copies a chunk of key data. Subkeys, whether they're
- * structured or leaves, which don't match the filter aren't
- * copied. The copy may or may not have structure in common
- * with the original.
- */
-
-static int structmatchp(key_data *k, const key_filter *kf)
-{
- key_subkeyiter i;
-
- if (!KEY_MATCH(k, kf)) return (0);
- else if ((k->e & KF_ENCMASK) == KENC_STRUCT) return (1);
- else {
- for (key_mksubkeyiter(&i, k); key_nextsubkey(&i, 0, &k); )
- if (!structmatchp(k, kf)) return (0);
- return (1);
- }
-}
-
-key_data *key_copydata(key_data *k, const key_filter *kf)
-{
- key_subkeyiter i;
- const char *tag;
- key_data *kd, *kkd;
-
- /* --- Trivial cases --- */
-
- if (!KEY_MATCH(k, kf))
- return (0);
- else if (structmatchp(k, kf)) {
- key_incref(k);
- return (k);
- }
-
- /* --- Copy a structured key recursively --- */
-
- kkd = key_newstruct();
- for (key_mksubkeyiter(&i, k); key_nextsubkey(&i, &tag, &kd); ) {
- if ((kd = key_copydata(kd, kf)) != 0)
- key_structsteal(kkd, tag, kd);
- }
-
- /* --- Done --- */
-
- return (kkd);
-}
-
-/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff