+/*
+ * keydb_dynamic.c - backend that can load the other backends
+ *
+ * Brett Parker <iDunno@sommitrealweird.co.uk>
+ *
+ * Copyright 2005 Project Purple
+ */
+
+#include <stdio.h>
+
+#include "decodekey.h"
+#include "hash.h"
+#include "keydb.h"
+#include "keyid.h"
+#include "keystructs.h"
+#include "mem.h"
+#include "merge.h"
+#include "parsekey.h"
+#include "sendsync.h"
+#include "keydb_dynamic.h"
+
+struct dynamic_backend *get_backend(void)
+{
+ return &__dynamicdb_backend__;
+}
+
+bool backend_loaded(void)
+{
+ return __dynamicdb_backend__.loaded;
+}
+
+bool load_backend(void)
+{
+ char *soname = NULL;
+ void *handle;
+ struct dynamic_backend *backend = get_backend();
+
+ if (backend->loaded) {
+ close_backend();
+ }
+
+ if (config.backends_dir == NULL) {
+ soname = malloc(strlen(config.db_backend)
+ + strlen("/libkeydb_")
+ + strlen(".so")
+ + 1);
+
+ sprintf(soname, "libkeydb_%s.so", config.db_backend);
+ } else {
+ soname = malloc(strlen(config.db_backend)
+ + strlen("/libkeydb_")
+ + strlen(".so")
+ + strlen(config.backends_dir)
+ + 1);
+
+ sprintf(soname, "%s/libkeydb_%s.so", config.backends_dir,
+ config.db_backend);
+ }
+
+ logthing(LOGTHING_INFO, "Loading dynamic backend: %s", soname);
+
+ handle = dlopen(soname, RTLD_LAZY);
+ if (handle == NULL) {
+ logthing(LOGTHING_ERROR,
+ "Failed to open handle to library '%s': %s",
+ soname, dlerror());
+ free(soname);
+ soname = NULL;
+ return false;
+ }
+ free(soname);
+ soname = NULL;
+
+ backend->initdb = (initdbfunc_t) dlsym(handle, "initdb");
+ backend->cleanupdb = (cleanupdbfunc_t) dlsym(handle, "cleanupdb");
+ backend->starttrans = (starttransfunc_t) dlsym(handle, "starttrans");
+ backend->endtrans = (endtransfunc_t) dlsym(handle, "endtrans");
+ backend->fetch_key = (fetch_keyfunc_t) dlsym(handle, "fetch_key");
+ backend->store_key = (store_keyfunc_t) dlsym(handle, "store_key");
+ backend->delete_key = (delete_keyfunc_t) dlsym(handle, "delete_key");
+ backend->fetch_key_text = (fetch_key_textfunc_t)
+ dlsym (handle, "fetch_key_text");
+ backend->update_keys = (update_keysfunc_t)
+ dlsym(handle, "update_keys");
+ backend->keyid2uid = (keyid2uidfunc_t) dlsym(handle, "keyid2uid");
+ backend->cached_getkeysigs = (cached_getkeysigsfunc_t)
+ dlsym(handle, "cached_getkeysigs");
+ backend->getfullkeyid = (getfullkeyidfunc_t)
+ dlsym(handle, "getfullkeyid");
+ backend->iterate_keys = (iterate_keysfunc_t)
+ dlsym(handle, "iterate_keys");
+
+ backend->handle = handle;
+ backend->loaded = true;
+
+ return true;
+}
+
+bool close_backend(void)
+{
+ struct dynamic_backend *backend;
+ backend = get_backend();
+
+ backend->initdb = NULL;
+ backend->cleanupdb = NULL;
+ backend->starttrans = NULL;
+ backend->endtrans = NULL;
+ backend->fetch_key = NULL;
+ backend->store_key = NULL;
+ backend->delete_key = NULL;
+ backend->fetch_key_text = NULL;
+ backend->update_keys = NULL;
+ backend->keyid2uid = NULL;
+ backend->cached_getkeysigs = NULL;
+ backend->getfullkeyid = NULL;
+ backend->iterate_keys = NULL;
+ backend->loaded = false;
+ dlclose(backend->handle);
+ backend->handle = NULL;
+
+ return true;
+}
+
+/**
+ * keyid2uid - Takes a keyid and returns the primary UID for it.
+ * @keyid: The keyid to lookup.
+ */
+char *keyid2uid(uint64_t keyid)
+{
+ struct openpgp_publickey *publickey = NULL;
+ struct openpgp_signedpacket_list *curuid = NULL;
+ char buf[1024];
+
+ struct dynamic_backend *backend;
+ if (!backend_loaded()) {
+ load_backend();
+ }
+
+ if (backend_loaded()) {
+ backend = get_backend();
+ if (backend->keyid2uid != NULL) {
+ return backend->keyid2uid(keyid);
+ }
+ }
+
+ buf[0]=0;
+ if (fetch_key(keyid, &publickey, false) && publickey != NULL) {
+ curuid = publickey->uids;
+ while (curuid != NULL && buf[0] == 0) {
+ if (curuid->packet->tag == 13) {
+ snprintf(buf, 1023, "%.*s",
+ (int) curuid->packet->length,
+ curuid->packet->data);
+ }
+ curuid = curuid -> next;
+ }
+ free_publickey(publickey);
+ }
+
+ if (buf[0] == 0) {
+ return NULL;
+ } else {
+ return strdup(buf);
+ }
+}
+
+/**
+ * getkeysigs - Gets a linked list of the signatures on a key.
+ * @keyid: The keyid to get the sigs for.
+ * @revoked: Is the key revoked?
+ *
+ * This function gets the list of signatures on a key. Used for key
+ * indexing and doing stats bits. If revoked is non-NULL then if the key
+ * is revoked it's set to true.
+ */
+struct ll *getkeysigs(uint64_t keyid, bool *revoked)
+{
+ struct ll *sigs = NULL;
+ struct openpgp_signedpacket_list *uids = NULL;
+ struct openpgp_publickey *publickey = NULL;
+
+ struct dynamic_backend *backend;
+ if ( !backend_loaded() ) {
+ load_backend();
+ }
+
+ if (backend_loaded()) {
+ backend = get_backend();
+ if (backend->getkeysigs != NULL) {
+ return backend->getkeysigs(keyid,revoked);
+ }
+ }
+
+ fetch_key(keyid, &publickey, false);
+
+ if (publickey != NULL) {
+ for (uids = publickey->uids; uids != NULL; uids = uids->next) {
+ sigs = keysigs(sigs, uids->sigs);
+ }
+ if (revoked != NULL) {
+ *revoked = (publickey->revocations != NULL);
+ }
+ free_publickey(publickey);
+ }
+
+ return sigs;
+}
+
+/**
+ * cached_getkeysigs - Gets the signatures on a key.
+ * @keyid: The key we want the signatures for.
+ *
+ * This function gets the signatures on a key. It's the same as the
+ * getkeysigs function above except we use the hash module to cache the
+ * data so if we need it again it's already loaded.
+ */
+struct ll *cached_getkeysigs(uint64_t keyid)
+{
+ struct stats_key *key = NULL;
+ struct stats_key *signedkey = NULL;
+ struct ll *cursig = NULL;
+ bool revoked = false;
+
+ struct dynamic_backend *backend;
+
+ if (keyid == 0) {
+ return NULL;
+ }
+
+ if (!backend_loaded()) {
+ load_backend();
+ }
+
+ if (backend_loaded()) {
+ backend = get_backend();
+ if (backend->cached_getkeysigs != NULL) {
+ return backend->cached_getkeysigs(keyid);
+ }
+ }
+
+ key = createandaddtohash(keyid);
+
+ if (key->gotsigs == false) {
+ key->sigs = getkeysigs(key->keyid, &revoked);
+ key->revoked = revoked;
+ for (cursig = key->sigs; cursig != NULL;
+ cursig = cursig->next) {
+ signedkey = (struct stats_key *) cursig->object;
+ signedkey->signs = lladd(signedkey->signs, key);
+ }
+ key->gotsigs = true;
+ }
+
+ return key->sigs;
+}
+
+/**
+ * getfullkeyid - Maps a 32bit key id to a 64bit one.
+ * @keyid: The 32bit keyid.
+ *
+ * This function maps a 32bit key id to the full 64bit one. It returns the
+ * full keyid. If the key isn't found a keyid of 0 is returned.
+ */
+uint64_t getfullkeyid(uint64_t keyid)
+{
+ struct openpgp_publickey *publickey = NULL;
+ struct dynamic_backend *backend;
+
+ if (!backend_loaded()) {
+ load_backend();
+ }
+
+ if (backend_loaded()) {
+ backend = get_backend();
+ if (backend->getfullkeyid != NULL) {
+ return backend->getfullkeyid(keyid);
+ }
+ }
+
+ if (keyid < 0x100000000LL) {
+ fetch_key(keyid, &publickey, false);
+ if (publickey != NULL) {
+ keyid = get_keyid(publickey);
+ free_publickey(publickey);
+ publickey = NULL;
+ } else {
+ keyid = 0;
+ }
+ }
+
+ return keyid;
+}
+
+/**
+ * update_keys - Takes a list of public keys and updates them in the DB.
+ * @keys: The keys to update in the DB.
+ * @sendsync: Should we send a sync mail to our peers.
+ *
+ * Takes a list of keys and adds them to the database, merging them with
+ * the key in the database if it's already present there. The key list is
+ * update to contain the minimum set of updates required to get from what
+ * we had before to what we have now (ie the set of data that was added to
+ * the DB). Returns the number of entirely new keys added.
+ */
+int update_keys(struct openpgp_publickey **keys, bool sendsync)
+{
+ struct openpgp_publickey *curkey = NULL;
+ struct openpgp_publickey *oldkey = NULL;
+ struct openpgp_publickey *prev = NULL;
+ struct dynamic_backend *backend;
+ int newkeys = 0;
+ bool intrans;
+
+ if (!backend_loaded()) {
+ load_backend();
+ }
+
+ if (backend_loaded()) {
+ backend = get_backend();
+ if (backend->update_keys != NULL) {
+ return backend->update_keys(keys, sendsync);
+ }
+ }
+
+ for (curkey = *keys; curkey != NULL; curkey = curkey->next) {
+ intrans = starttrans();
+ logthing(LOGTHING_INFO,
+ "Fetching key 0x%llX, result: %d",
+ get_keyid(curkey),
+ fetch_key(get_keyid(curkey), &oldkey, intrans));
+
+ /*
+ * If we already have the key stored in the DB then merge it
+ * with the new one that's been supplied. Otherwise the key
+ * we've just got is the one that goes in the DB and also the
+ * one that we send out.
+ */
+ if (oldkey != NULL) {
+ merge_keys(oldkey, curkey);
+ if (curkey->revocations == NULL &&
+ curkey->uids == NULL &&
+ curkey->subkeys == NULL) {
+ if (prev == NULL) {
+ *keys = curkey->next;
+ } else {
+ prev->next = curkey->next;
+ curkey->next = NULL;
+ free_publickey(curkey);
+ curkey = prev;
+ }
+ } else {
+ prev = curkey;
+ logthing(LOGTHING_INFO,
+ "Merged key; storing updated key.");
+ store_key(oldkey, intrans, true);
+ }
+ free_publickey(oldkey);
+ oldkey = NULL;
+
+ } else {
+ logthing(LOGTHING_INFO,
+ "Storing completely new key.");
+ store_key(curkey, intrans, false);
+ newkeys++;
+ }
+ endtrans();
+ intrans = false;
+ }
+
+ if (sendsync && keys != NULL) {
+ sendkeysync(*keys);
+ }
+
+ return newkeys;
+}
+
+void initdb(bool readonly)
+{
+ struct dynamic_backend *backend;
+ backend = get_backend();
+
+ if (!backend_loaded()) {
+ load_backend();
+ }
+
+ if (backend->loaded) {
+ if (backend->initdb != NULL) {
+ backend->initdb(readonly);
+ }
+ }
+}
+
+void cleanupdb(void)
+{
+ struct dynamic_backend *backend;
+ backend = get_backend();
+
+ if (backend->loaded) {
+ if (backend->cleanupdb != NULL) {
+ backend->cleanupdb();
+ }
+ }
+
+ close_backend();
+}
+
+bool starttrans()
+{
+ struct dynamic_backend *backend;
+ backend = get_backend();
+
+ if (!backend_loaded()) {
+ load_backend();
+ }
+
+ if (backend->loaded) {
+ if (backend->starttrans != NULL) {
+ return backend->starttrans();
+ }
+ }
+
+ return false;
+}
+
+void endtrans()
+{
+ struct dynamic_backend *backend;
+ backend = get_backend();
+
+ if (!backend_loaded()) {
+ load_backend();
+ }
+
+ if (backend->loaded) {
+ if (backend->endtrans != NULL) {
+ backend->endtrans();
+ }
+ }
+}
+
+int fetch_key(uint64_t keyid, struct openpgp_publickey **publickey,
+ bool intrans)
+{
+ struct dynamic_backend *backend;
+ backend = get_backend();
+
+ if (!backend_loaded()) {
+ load_backend();
+ }
+
+ if (backend->loaded) {
+ if (backend->fetch_key != NULL) {
+ return backend->fetch_key(keyid,publickey,intrans);
+ }
+ }
+
+ return -1;
+}
+
+int store_key(struct openpgp_publickey *publickey, bool intrans, bool update)
+{
+ struct dynamic_backend *backend;
+ backend = get_backend();
+
+ if (!backend_loaded()) {
+ load_backend();
+ }
+
+ if (backend->loaded) {
+ if (backend->store_key != NULL) {
+ return backend->store_key(publickey,intrans,update);
+ }
+ }
+
+ return -1;
+}
+
+int delete_key(uint64_t keyid, bool intrans)
+{
+ struct dynamic_backend *backend;
+ backend = get_backend();
+
+ if (!backend_loaded()) {
+ load_backend();
+ }
+
+ if (backend->loaded) {
+ if (backend->delete_key != NULL) {
+ return backend->delete_key(keyid, intrans);
+ }
+ }
+
+ return -1;
+}
+
+int fetch_key_text(const char *search, struct openpgp_publickey **publickey)
+{
+ struct dynamic_backend *backend;
+ backend = get_backend();
+
+ if (!backend_loaded()) {
+ load_backend();
+ }
+
+ if (backend->loaded) {
+ if (backend->fetch_key_text != NULL) {
+ return backend->fetch_key_text(search, publickey);
+ }
+ }
+
+ return -1;
+}
+
+int iterate_keys(void (*iterfunc)(void *ctx, struct openpgp_publickey *key),
+ void *ctx)
+{
+ struct dynamic_backend *backend;
+ backend = get_backend();
+
+ if (!backend_loaded()) {
+ load_backend();
+ }
+
+ if (backend->loaded) {
+ if (backend->iterate_keys != NULL) {
+ return backend->iterate_keys(iterfunc, ctx);
+ }
+ }
+
+ return -1;
+}
projects / onak.git / commitdiff