X-Git-Url: https://git.sommitrealweird.co.uk/onak.git/blobdiff_plain/3dcacadf03a7cf272f1618b981b08121504e131a..8d14d66b84cc370cefe54b33de1b95bb49c90bf6:/keydb_db4.c?ds=sidebyside

diff --git a/keydb_db4.c b/keydb_db4.c
index 6d57cd3..8990758 100644
--- a/keydb_db4.c
+++ b/keydb_db4.c
@@ -1,12 +1,11 @@
 /*
  * keydb_db4.c - Routines to store and fetch keys in a DB4 database.
  *
- * Jonathan McDowell <noodles@earth.li>
- *
- * Copyright 2002-2004 Project Purple
+ * Copyright 2002-2008 Jonathan McDowell <noodles@earth.li>
  */
 
 #include <sys/types.h>
+#include <sys/stat.h>
 #include <sys/uio.h>
 #include <ctype.h>
 #include <errno.h>
@@ -30,6 +29,8 @@
 #include "parsekey.h"
 #include "wordlist.h"
 
+#define DB4_UPGRADE_FILE "db_upgrade.lck"
+
 /**
  *	dbenv - our database environment.
  */
@@ -69,6 +70,198 @@ DB *keydb(uint64_t keyid)
 	return(dbconns[keytrun % numdbs]);
 }
 
+/**
+ *	db4_errfunc - Direct DB errors to logfile
+ *
+ *	Basic function to take errors from the DB library and output them to
+ *	the logfile rather than stderr.
+ */
+#if (DB_VERSION_MAJOR == 4) && (DB_VERSION_MINOR < 3)
+static void db4_errfunc(const char *errpfx, const char *errmsg)
+#else
+static void db4_errfunc(const DB_ENV *edbenv, const char *errpfx,
+		const char *errmsg)
+#endif
+{
+	if (errpfx) {
+		logthing(LOGTHING_DEBUG, "db4 error: %s:%s", errpfx, errmsg);
+	} else {
+		logthing(LOGTHING_DEBUG, "db4 error: %s", errmsg);
+	}
+
+	return;
+}
+
+/**
+ *	starttrans - Start a transaction.
+ *
+ *	Start a transaction. Intended to be used if we're about to perform many
+ *	operations on the database to help speed it all up, or if we want
+ *	something to only succeed if all relevant operations are successful.
+ */
+static bool db4_starttrans(void)
+{
+	int ret;
+
+	log_assert(dbenv != NULL);
+	log_assert(txn == NULL);
+
+	ret = dbenv->txn_begin(dbenv,
+		NULL, /* No parent transaction */
+		&txn,
+		0);
+	if (ret != 0) {
+		logthing(LOGTHING_CRITICAL,
+				"Error starting transaction: %s",
+				db_strerror(ret));
+		exit(1);
+	}
+
+	return true;
+}
+
+/**
+ *	endtrans - End a transaction.
+ *
+ *	Ends a transaction.
+ */
+static void db4_endtrans(void)
+{
+	int ret;
+
+	log_assert(dbenv != NULL);
+	log_assert(txn != NULL);
+
+	ret = txn->commit(txn,
+		0);
+	if (ret != 0) {
+		logthing(LOGTHING_CRITICAL,
+				"Error ending transaction: %s",
+				db_strerror(ret));
+		exit(1);
+	}
+	txn = NULL;
+
+	return;
+}
+
+/**
+ *	cleanupdb - De-initialize the key database.
+ *
+ *	This function should be called upon program exit to allow the DB to
+ *	cleanup after itself.
+ */
+static void db4_cleanupdb(void)
+{
+	int i = 0;
+
+	if (dbenv != NULL) {
+		dbenv->txn_checkpoint(dbenv, 0, 0, 0);
+		if (id32db != NULL) {
+			id32db->close(id32db, 0);
+			id32db = NULL;
+		}
+		if (worddb != NULL) {
+			worddb->close(worddb, 0);
+			worddb = NULL;
+		}
+		for (i = 0; i < numdbs; i++) {
+			if (dbconns[i] != NULL) {
+				dbconns[i]->close(dbconns[i], 0);
+				dbconns[i] = NULL;
+			}
+		}
+		free(dbconns);
+		dbconns = NULL;
+		dbenv->close(dbenv, 0);
+		dbenv = NULL;
+	}
+}
+
+/**
+ *	db4_upgradedb - Upgrade a DB4 database
+ *
+ *	Called if we discover we need to upgrade our DB4 database; ie if
+ *	we're running with a newer version of db4 than the database was
+ *	created with.
+ */
+static int db4_upgradedb(int numdb)
+{
+	DB *curdb = NULL;
+	int ret;
+	int i;
+	char buf[1024];
+	int lockfile_fd;
+	struct stat statbuf;
+
+	snprintf(buf, sizeof(buf) - 1, "%s/%s", config.db_dir,
+			DB4_UPGRADE_FILE);
+	lockfile_fd = open(buf, O_RDWR | O_CREAT | O_EXCL, 0600);
+	if (lockfile_fd < 0) {
+		if (errno == EEXIST) {
+			while (stat(buf, &statbuf) == 0) ;
+			return 0;
+		} else {
+			logthing(LOGTHING_CRITICAL, "Couldn't open database "
+				"update lock file: %s", strerror(errno));
+			return -1;
+		}
+	}
+	snprintf(buf, sizeof(buf) - 1, "%d", getpid());
+	write(lockfile_fd, buf, strlen(buf));
+	close(lockfile_fd);
+
+	logthing(LOGTHING_NOTICE, "Upgrading DB4 database");
+	ret = db_env_create(&dbenv, 0);
+	dbenv->set_errcall(dbenv, &db4_errfunc);
+	dbenv->remove(dbenv, config.db_dir, 0);
+	dbenv = NULL;
+	for (i = 0; i < numdb; i++) {
+		ret = db_create(&curdb, NULL, 0);
+		if (ret == 0) {
+			snprintf(buf, sizeof(buf) - 1, "%s/keydb.%d.db",
+				config.db_dir, i);
+			logthing(LOGTHING_DEBUG, "Upgrading %s", buf);
+			ret = curdb->upgrade(curdb, buf, 0);
+			curdb->close(curdb, 0);
+		} else {
+			logthing(LOGTHING_ERROR, "Error upgrading DB %s : %s",
+				buf,
+				db_strerror(ret));
+		}
+	}
+
+	ret = db_create(&curdb, NULL, 0);
+	if (ret == 0) {
+		snprintf(buf, sizeof(buf) - 1, "%s/worddb", config.db_dir);
+		logthing(LOGTHING_DEBUG, "Upgrading %s", buf);
+		ret = curdb->upgrade(curdb, buf, 0);
+		curdb->close(curdb, 0);
+	} else {
+		logthing(LOGTHING_ERROR, "Error upgrading DB %s : %s",
+			buf,
+			db_strerror(ret));
+	}
+
+	ret = db_create(&curdb, NULL, 0);
+	if (ret == 0) {
+		snprintf(buf, sizeof(buf) - 1, "%s/id32db", config.db_dir);
+		logthing(LOGTHING_DEBUG, "Upgrading %s", buf);
+		ret = curdb->upgrade(curdb, buf, 0);
+		curdb->close(curdb, 0);
+	} else {
+		logthing(LOGTHING_ERROR, "Error upgrading DB %s : %s",
+			buf,
+			db_strerror(ret));
+	}
+
+	snprintf(buf, sizeof(buf) - 1, "%s/%s", config.db_dir,
+			DB4_UPGRADE_FILE);
+	unlink(buf);
+
+	return ret;
+}
+
 /**
  *	initdb - Initialize the key database.
  *
@@ -76,13 +269,29 @@ DB *keydb(uint64_t keyid)
  *	this file are called in order to allow the DB to be initialized ready
  *	for access.
  */
-void initdb(bool readonly)
+static void db4_initdb(bool readonly)
 {
 	char       buf[1024];
 	FILE      *numdb = NULL;
 	int        ret = 0;
 	int        i = 0;
 	u_int32_t  flags = 0;
+	struct stat statbuf;
+
+	snprintf(buf, sizeof(buf) - 1, "%s/%s", config.db_dir,
+			DB4_UPGRADE_FILE);
+	ret = stat(buf, &statbuf);
+	while ((ret == 0) || (errno != ENOENT)) {
+		if (ret != 0) {
+			logthing(LOGTHING_CRITICAL, "Couldn't stat upgrade "
+				"lock file: %s (%d)", strerror(errno), ret);
+			exit(1);
+		}
+		logthing(LOGTHING_DEBUG, "DB4 upgrade in progress; waiting.");
+		sleep(5);
+		ret = stat(buf, &statbuf);
+	}
+	ret = 0;
 
 	snprintf(buf, sizeof(buf) - 1, "%s/num_keydb", config.db_dir);
 	numdb = fopen(buf, "r");
@@ -105,7 +314,7 @@ void initdb(bool readonly)
 		}
 	}
 
-	dbconns = malloc(sizeof (DB *) * numdbs);
+	dbconns = calloc(numdbs, sizeof (DB *));
 	if (dbconns == NULL) {
 		logthing(LOGTHING_CRITICAL,
 				"Couldn't allocate memory for dbconns");
@@ -126,6 +335,7 @@ void initdb(bool readonly)
 	 * sure how to make the standard DB functions do that yet.
 	 */
 	if (ret == 0) {
+		dbenv->set_errcall(dbenv, &db4_errfunc);
 		ret = dbenv->set_lk_detect(dbenv, DB_LOCK_DEFAULT);
 		if (ret != 0) {
 			logthing(LOGTHING_CRITICAL,
@@ -139,16 +349,44 @@ void initdb(bool readonly)
 				DB_INIT_TXN |
 				DB_CREATE,
 				0);
+#ifdef DB_VERSION_MISMATCH
+		if (ret == DB_VERSION_MISMATCH) {
+			dbenv->close(dbenv, 0);
+			dbenv = NULL;
+			ret = db4_upgradedb(numdbs);
+			if (ret == 0) {
+				ret = db_env_create(&dbenv, 0);
+			}
+			if (ret == 0) {
+				dbenv->set_errcall(dbenv, &db4_errfunc);
+				dbenv->set_lk_detect(dbenv, DB_LOCK_DEFAULT);
+				ret = dbenv->open(dbenv, config.db_dir,
+					DB_INIT_LOG | DB_INIT_MPOOL |
+					DB_INIT_LOCK | DB_INIT_TXN |
+					DB_CREATE | DB_RECOVER,
+					0);
+
+				if (ret == 0) {
+					dbenv->txn_checkpoint(dbenv,
+							0,
+							0,
+							DB_FORCE);
+				}
+			}
+		}
+#endif
 		if (ret != 0) {
 			logthing(LOGTHING_CRITICAL,
 					"Error opening db environment: %s (%s)",
 					config.db_dir,
 					db_strerror(ret));
+			dbenv->close(dbenv, 0);
+			dbenv = NULL;
 		}
 	}
 
 	if (ret == 0) {
-		starttrans();
+		db4_starttrans();
 
 		for (i = 0; !ret && i < numdbs; i++) {
 			ret = db_create(&dbconns[i], dbenv, 0);
@@ -231,11 +469,11 @@ void initdb(bool readonly)
 	}
 
 	if (txn != NULL) {
-		endtrans();
+		db4_endtrans();
 	}
 
 	if (ret != 0) {
-		cleanupdb();
+		db4_cleanupdb();
 		logthing(LOGTHING_CRITICAL,
 				"Error opening database; exiting");
 		exit(EXIT_FAILURE);
@@ -245,87 +483,52 @@ void initdb(bool readonly)
 }
 
 /**
- *	cleanupdb - De-initialize the key database.
+ *	getfullkeyid - Maps a 32bit key id to a 64bit one.
+ *	@keyid: The 32bit keyid.
  *
- *	This function should be called upon program exit to allow the DB to
- *	cleanup after itself.
+ *	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.
  */
-void cleanupdb(void)
+static uint64_t db4_getfullkeyid(uint64_t keyid)
 {
-	int i = 0;
-
-	if (dbenv != NULL) {
-		dbenv->txn_checkpoint(dbenv, 0, 0, 0);
-		if (id32db != NULL) {
-			id32db->close(id32db, 0);
-			id32db = NULL;
-		}
-		if (worddb != NULL) {
-			worddb->close(worddb, 0);
-			worddb = NULL;
-		}
-		for (i = 0; i < numdbs; i++) {
-			if (dbconns[i] != NULL) {
-				dbconns[i]->close(dbconns[i], 0);
-				dbconns[i] = NULL;
-			}
-		}
-		dbenv->close(dbenv, 0);
-		dbenv = NULL;
-	}
-}
+	DBT       key, data;
+	DBC      *cursor = NULL;
+	uint32_t  shortkeyid = 0;
+	int       ret = 0;
 
-/**
- *	starttrans - Start a transaction.
- *
- *	Start a transaction. Intended to be used if we're about to perform many
- *	operations on the database to help speed it all up, or if we want
- *	something to only succeed if all relevant operations are successful.
- */
-bool starttrans(void)
-{
-	int ret;
+	if (keyid < 0x100000000LL) {
+		ret = id32db->cursor(id32db,
+				txn,
+				&cursor,
+				0);   /* flags */
 
-	log_assert(dbenv != NULL);
-	log_assert(txn == NULL);
+		shortkeyid = keyid & 0xFFFFFFFF;
 
-	ret = dbenv->txn_begin(dbenv,
-		NULL, /* No parent transaction */
-		&txn,
-		0);
-	if (ret != 0) {
-		logthing(LOGTHING_CRITICAL,
-				"Error starting transaction: %s",
-				db_strerror(ret));
-		exit(1);
-	}
+		memset(&key, 0, sizeof(key));
+		memset(&data, 0, sizeof(data));
+		key.data = &shortkeyid;
+		key.size = sizeof(shortkeyid);
+		data.flags = DB_DBT_MALLOC;
 
-	return true;
-}
+		ret = cursor->c_get(cursor,
+			&key,
+			&data,
+			DB_SET);
 
-/**
- *	endtrans - End a transaction.
- *
- *	Ends a transaction.
- */
-void endtrans(void)
-{
-	int ret;
+		if (ret == 0) {
+			keyid = *(uint64_t *) data.data;
 
-	log_assert(dbenv != NULL);
-	log_assert(txn != NULL);
+			if (data.data != NULL) {
+				free(data.data);
+				data.data = NULL;
+			}
+		}
 
-	ret = txn->commit(txn,
-		0);
-	if (ret != 0) {
-		logthing(LOGTHING_CRITICAL,
-				"Error ending transaction: %s",
-				db_strerror(ret));
-		exit(1);
+		ret = cursor->c_close(cursor);
+		cursor = NULL;
 	}
-	txn = NULL;
-
-	return;
+	
+	return keyid;
 }
 
 /**
@@ -340,7 +543,7 @@ void endtrans(void)
  *	in and then parse_keys() to parse the packets into a publickey
  *	structure.
  */
-int fetch_key(uint64_t keyid, struct openpgp_publickey **publickey,
+static int db4_fetch_key(uint64_t keyid, struct openpgp_publickey **publickey,
 		bool intrans)
 {
 	struct openpgp_packet_list *packets = NULL;
@@ -350,7 +553,7 @@ int fetch_key(uint64_t keyid, struct openpgp_publickey **publickey,
 	struct buffer_ctx fetchbuf;
 
 	if (keyid < 0x100000000LL) {
-		keyid = getfullkeyid(keyid);
+		keyid = db4_getfullkeyid(keyid);
 	}
 
 	memset(&key, 0, sizeof(key));
@@ -363,7 +566,7 @@ int fetch_key(uint64_t keyid, struct openpgp_publickey **publickey,
 	key.data = &keyid;
 
 	if (!intrans) {
-		starttrans();
+		db4_starttrans();
 	}
 
 	ret = keydb(keyid)->get(keydb(keyid),
@@ -389,7 +592,7 @@ int fetch_key(uint64_t keyid, struct openpgp_publickey **publickey,
 	}
 
 	if (!intrans) {
-		endtrans();
+		db4_endtrans();
 	}
 
 	return (numkeys);
@@ -408,7 +611,8 @@ int worddb_cmp(const void *d1, const void *d2)
  *	This function searches for the supplied text and returns the keys that
  *	contain it.
  */
-int fetch_key_text(const char *search, struct openpgp_publickey **publickey)
+static int db4_fetch_key_text(const char *search,
+		struct openpgp_publickey **publickey)
 {
 	DBC *cursor = NULL;
 	DBT key, data;
@@ -421,13 +625,14 @@ int fetch_key_text(const char *search, struct openpgp_publickey **publickey)
 	struct ll *curword = NULL;
 	struct keyarray keylist = { NULL, 0, 0 };
 	struct keyarray newkeylist = { NULL, 0, 0 };
+	int firstpass = 1;
 
 	numkeys = 0;
 	searchtext = strdup(search);
 	wordlist = makewordlist(wordlist, searchtext);
 
 	for (curword = wordlist; curword != NULL; curword = curword->next) {
-		starttrans();
+		db4_starttrans();
 
 		ret = worddb->cursor(worddb,
 				txn,
@@ -453,8 +658,12 @@ int fetch_key_text(const char *search, struct openpgp_publickey **publickey)
 						data.data)[i];
 			}
 
-			if (keylist.count == 0 ||
-					array_find(&keylist, keyid)) {
+			/*
+			 * Only add the keys containing this word if this is
+			 * our first pass (ie we have no existing key list),
+			 * or the key contained a previous word.
+			 */
+			if (firstpass || array_find(&keylist, keyid)) {
 				array_add(&newkeylist, keyid);
 			}
 
@@ -476,14 +685,15 @@ int fetch_key_text(const char *search, struct openpgp_publickey **publickey)
 		}
 		ret = cursor->c_close(cursor);
 		cursor = NULL;
-		endtrans();
+		firstpass = 0;
+		db4_endtrans();
 	}
 	llfree(wordlist, NULL);
 	wordlist = NULL;
 	
-	starttrans();
+	db4_starttrans();
 	for (i = 0; i < keylist.count; i++) {
-		numkeys += fetch_key(keylist.keys[i],
+		numkeys += db4_fetch_key(keylist.keys[i],
 			publickey,
 			true);
 	}
@@ -491,120 +701,56 @@ int fetch_key_text(const char *search, struct openpgp_publickey **publickey)
 	free(searchtext);
 	searchtext = NULL;
 
-	endtrans();
+	db4_endtrans();
 	
 	return (numkeys);
 }
 
 /**
- *	store_key - Takes a key and stores it.
- *	@publickey: A pointer to the public key to store.
+ *	delete_key - Given a keyid delete the key from storage.
+ *	@keyid: The keyid to delete.
  *	@intrans: If we're already in a transaction.
- *	@update: If true the key exists and should be updated.
  *
- *	Again we just use the hex representation of the keyid as the filename
- *	to store the key to. We flatten the public key to a list of OpenPGP
- *	packets and then use write_openpgp_stream() to write the stream out to
- *	the file. If update is true then we delete the old key first, otherwise
- *	we trust that it doesn't exist.
+ *	This function deletes a public key from whatever storage mechanism we
+ *	are using. Returns 0 if the key existed.
  */
-int store_key(struct openpgp_publickey *publickey, bool intrans, bool update)
+static int db4_delete_key(uint64_t keyid, bool intrans)
 {
-	struct     openpgp_packet_list *packets = NULL;
-	struct     openpgp_packet_list *list_end = NULL;
-	struct     openpgp_publickey *next = NULL;
-	int        ret = 0;
-	int        i = 0;
-	struct     buffer_ctx storebuf;
-	DBT        key;
-	DBT        data;
-	uint64_t   keyid = 0;
+	struct openpgp_publickey *publickey = NULL;
+	DBT key, data;
+	DBC *cursor = NULL;
 	uint32_t   shortkeyid = 0;
 	uint64_t  *subkeyids = NULL;
-	char     **uids = NULL;
-	char      *primary = NULL;
-	unsigned char worddb_data[12];
+	int ret = 0;
+	int i;
+	char **uids = NULL;
+	char *primary = NULL;
+	unsigned char worddb_data[12];
 	struct ll *wordlist = NULL;
 	struct ll *curword  = NULL;
-	bool       deadlock = false;
-
-	keyid = get_keyid(publickey);
+	bool deadlock = false;
 
 	if (!intrans) {
-		starttrans();
+		db4_starttrans();
 	}
 
-	/*
-	 * Delete the key if we already have it.
-	 *
-	 * TODO: Can we optimize this perhaps? Possibly when other data is
-	 * involved as well? I suspect this is easiest and doesn't make a lot
-	 * of difference though - the largest chunk of data is the keydata and
-	 * it definitely needs updated.
-	 */
-	if (update) {
-		deadlock = (delete_key(keyid, true) == -1);
-	}
+	db4_fetch_key(keyid, &publickey, true);
 
 	/*
-	 * Convert the key to a flat set of binary data.
-	 */
-	if (!deadlock) {
-		next = publickey->next;
-		publickey->next = NULL;
-		flatten_publickey(publickey, &packets, &list_end);
-		publickey->next = next;
-
-		storebuf.offset = 0; 
-		storebuf.size = 8192;
-		storebuf.buffer = malloc(8192);
-	
-		write_openpgp_stream(buffer_putchar, &storebuf, packets);
-
-		/*
-		 * Now we have the key data store it in the DB; the keyid is
-		 * the key.
-		 */
-		memset(&key, 0, sizeof(key));
-		memset(&data, 0, sizeof(data));
-		key.data = &keyid;
-		key.size = sizeof(keyid);
-		data.size = storebuf.offset;
-		data.data = storebuf.buffer;
-
-		ret = keydb(keyid)->put(keydb(keyid),
-				txn,
-				&key,
-				&data,
-				0); /* flags*/
-		if (ret != 0) {
-			logthing(LOGTHING_ERROR,
-					"Problem storing key: %s",
-					db_strerror(ret));
-			if (ret == DB_LOCK_DEADLOCK) {
-				deadlock = true;
-			}
-		}
-
-		free(storebuf.buffer);
-		storebuf.buffer = NULL;
-		storebuf.size = 0;
-		storebuf.offset = 0; 
-	
-		free_packet_list(packets);
-		packets = NULL;
-	}
-
-	/*
-	 * Walk through our uids storing the words into the db with the keyid.
+	 * Walk through the uids removing the words from the worddb.
 	 */
-	if (!deadlock) {
+	if (publickey != NULL) {
 		uids = keyuids(publickey, &primary);
 	}
 	if (uids != NULL) {
 		for (i = 0; ret == 0 && uids[i] != NULL; i++) {
 			wordlist = makewordlist(wordlist, uids[i]);
 		}
+				
+		ret = worddb->cursor(worddb,
+			txn,
+			&cursor,
+			0);   /* flags */
 
 		for (curword = wordlist; curword != NULL && !deadlock;
 				curword = curword->next) {
@@ -631,20 +777,32 @@ int store_key(struct openpgp_publickey *publickey, bool intrans, bool update)
 			worddb_data[ 9] = (keyid >> 16) & 0xFF;
 			worddb_data[10] = (keyid >>  8) & 0xFF;
 			worddb_data[11] = keyid & 0xFF; 
-			ret = worddb->put(worddb,
-				txn,
+
+			ret = cursor->c_get(cursor,
 				&key,
 				&data,
-				0);
+				DB_GET_BOTH);
+
+			if (ret == 0) {
+				ret = cursor->c_del(cursor, 0);
+				if (ret != 0) {
+					logthing(LOGTHING_ERROR,
+						"Problem deleting word: %s",
+						db_strerror(ret));
+				}
+			}
+
 			if (ret != 0) {
 				logthing(LOGTHING_ERROR,
-					"Problem storing word: %s",
+					"Problem deleting word: %s",
 					db_strerror(ret));
 				if (ret == DB_LOCK_DEADLOCK) {
 					deadlock = true;
 				}
 			}
 		}
+		ret = cursor->c_close(cursor);
+		cursor = NULL;
 
 		/*
 		 * Free our UID and word lists.
@@ -656,13 +814,16 @@ int store_key(struct openpgp_publickey *publickey, bool intrans, bool update)
 		}
 		free(uids);
 		uids = NULL;
+		free_publickey(publickey);
+		publickey = NULL;
 	}
 
-	/*
-	 * Write the truncated 32 bit keyid so we can lookup the full id for
-	 * queries.
-	 */
 	if (!deadlock) {
+		ret = id32db->cursor(id32db,
+			txn,
+			&cursor,
+			0);   /* flags */
+
 		shortkeyid = keyid & 0xFFFFFFFF;
 
 		memset(&key, 0, sizeof(key));
@@ -672,22 +833,29 @@ int store_key(struct openpgp_publickey *publickey, bool intrans, bool update)
 		data.data = &keyid;
 		data.size = sizeof(keyid);
 
-		ret = id32db->put(id32db,
-			txn,
+		ret = cursor->c_get(cursor,
 			&key,
 			&data,
-			0);
+			DB_GET_BOTH);
+
+		if (ret == 0) {
+			ret = cursor->c_del(cursor, 0);
+			if (ret != 0) {
+				logthing(LOGTHING_ERROR,
+					"Problem deleting short keyid: %s",
+					db_strerror(ret));
+			}
+		}
+
 		if (ret != 0) {
 			logthing(LOGTHING_ERROR,
-				"Problem storing short keyid: %s",
+				"Problem deleting short keyid: %s",
 				db_strerror(ret));
 			if (ret == DB_LOCK_DEADLOCK) {
 				deadlock = true;
 			}
 		}
-	}
 
-	if (!deadlock) {
 		subkeyids = keysubkeys(publickey);
 		i = 0;
 		while (subkeyids != NULL && subkeyids[i] != 0) {
@@ -700,14 +868,24 @@ int store_key(struct openpgp_publickey *publickey, bool intrans, bool update)
 			data.data = &keyid;
 			data.size = sizeof(keyid);
 
-			ret = id32db->put(id32db,
-				txn,
+			ret = cursor->c_get(cursor,
 				&key,
 				&data,
-				0);
+				DB_GET_BOTH);
+
+			if (ret == 0) {
+				ret = cursor->c_del(cursor, 0);
+				if (ret != 0) {
+					logthing(LOGTHING_ERROR,
+						"Problem deleting short"
+						" keyid: %s",
+						db_strerror(ret));
+				}
+			}
+
 			if (ret != 0) {
 				logthing(LOGTHING_ERROR,
-					"Problem storing short keyid: %s",
+					"Problem deleting short keyid: %s",
 					db_strerror(ret));
 				if (ret == DB_LOCK_DEADLOCK) {
 					deadlock = true;
@@ -718,60 +896,138 @@ int store_key(struct openpgp_publickey *publickey, bool intrans, bool update)
 			free(subkeyids);
 			subkeyids = NULL;
 		}
+
+		ret = cursor->c_close(cursor);
+		cursor = NULL;
+	}
+
+	if (!deadlock) {
+		key.data = &keyid;
+		key.size = sizeof(keyid);
+
+		keydb(keyid)->del(keydb(keyid),
+				txn,
+				&key,
+				0); /* flags */
 	}
 
 	if (!intrans) {
-		endtrans();
+		db4_endtrans();
 	}
 
-	return deadlock ? -1 : 0 ;
+	return deadlock ? (-1) : (ret == DB_NOTFOUND);
 }
 
 /**
- *	delete_key - Given a keyid delete the key from storage.
- *	@keyid: The keyid to delete.
+ *	store_key - Takes a key and stores it.
+ *	@publickey: A pointer to the public key to store.
  *	@intrans: If we're already in a transaction.
+ *	@update: If true the key exists and should be updated.
  *
- *	This function deletes a public key from whatever storage mechanism we
- *	are using. Returns 0 if the key existed.
+ *	Again we just use the hex representation of the keyid as the filename
+ *	to store the key to. We flatten the public key to a list of OpenPGP
+ *	packets and then use write_openpgp_stream() to write the stream out to
+ *	the file. If update is true then we delete the old key first, otherwise
+ *	we trust that it doesn't exist.
  */
-int delete_key(uint64_t keyid, bool intrans)
+static int db4_store_key(struct openpgp_publickey *publickey, bool intrans,
+		bool update)
 {
-	struct openpgp_publickey *publickey = NULL;
-	DBT key, data;
-	DBC *cursor = NULL;
+	struct     openpgp_packet_list *packets = NULL;
+	struct     openpgp_packet_list *list_end = NULL;
+	struct     openpgp_publickey *next = NULL;
+	int        ret = 0;
+	int        i = 0;
+	struct     buffer_ctx storebuf;
+	DBT        key;
+	DBT        data;
+	uint64_t   keyid = 0;
 	uint32_t   shortkeyid = 0;
 	uint64_t  *subkeyids = NULL;
-	int ret = 0;
-	int i;
-	char **uids = NULL;
-	char *primary = NULL;
+	char     **uids = NULL;
+	char      *primary = NULL;
 	unsigned char worddb_data[12];
 	struct ll *wordlist = NULL;
 	struct ll *curword  = NULL;
-	bool deadlock = false;
+	bool       deadlock = false;
+
+	keyid = get_keyid(publickey);
 
 	if (!intrans) {
-		starttrans();
+		db4_starttrans();
+	}
+
+	/*
+	 * Delete the key if we already have it.
+	 *
+	 * TODO: Can we optimize this perhaps? Possibly when other data is
+	 * involved as well? I suspect this is easiest and doesn't make a lot
+	 * of difference though - the largest chunk of data is the keydata and
+	 * it definitely needs updated.
+	 */
+	if (update) {
+		deadlock = (db4_delete_key(keyid, true) == -1);
 	}
 
-	fetch_key(keyid, &publickey, true);
+	/*
+	 * Convert the key to a flat set of binary data.
+	 */
+	if (!deadlock) {
+		next = publickey->next;
+		publickey->next = NULL;
+		flatten_publickey(publickey, &packets, &list_end);
+		publickey->next = next;
+
+		storebuf.offset = 0; 
+		storebuf.size = 8192;
+		storebuf.buffer = malloc(8192);
+	
+		write_openpgp_stream(buffer_putchar, &storebuf, packets);
+
+		/*
+		 * Now we have the key data store it in the DB; the keyid is
+		 * the key.
+		 */
+		memset(&key, 0, sizeof(key));
+		memset(&data, 0, sizeof(data));
+		key.data = &keyid;
+		key.size = sizeof(keyid);
+		data.size = storebuf.offset;
+		data.data = storebuf.buffer;
+
+		ret = keydb(keyid)->put(keydb(keyid),
+				txn,
+				&key,
+				&data,
+				0); /* flags*/
+		if (ret != 0) {
+			logthing(LOGTHING_ERROR,
+					"Problem storing key: %s",
+					db_strerror(ret));
+			if (ret == DB_LOCK_DEADLOCK) {
+				deadlock = true;
+			}
+		}
+
+		free(storebuf.buffer);
+		storebuf.buffer = NULL;
+		storebuf.size = 0;
+		storebuf.offset = 0; 
+	
+		free_packet_list(packets);
+		packets = NULL;
+	}
 
 	/*
-	 * Walk through the uids removing the words from the worddb.
+	 * Walk through our uids storing the words into the db with the keyid.
 	 */
-	if (publickey != NULL) {
+	if (!deadlock) {
 		uids = keyuids(publickey, &primary);
 	}
 	if (uids != NULL) {
 		for (i = 0; ret == 0 && uids[i] != NULL; i++) {
 			wordlist = makewordlist(wordlist, uids[i]);
 		}
-				
-		ret = worddb->cursor(worddb,
-			txn,
-			&cursor,
-			0);   /* flags */
 
 		for (curword = wordlist; curword != NULL && !deadlock;
 				curword = curword->next) {
@@ -798,32 +1054,20 @@ int delete_key(uint64_t keyid, bool intrans)
 			worddb_data[ 9] = (keyid >> 16) & 0xFF;
 			worddb_data[10] = (keyid >>  8) & 0xFF;
 			worddb_data[11] = keyid & 0xFF; 
-
-			ret = cursor->c_get(cursor,
+			ret = worddb->put(worddb,
+				txn,
 				&key,
 				&data,
-				DB_GET_BOTH);
-
-			if (ret == 0) {
-				ret = cursor->c_del(cursor, 0);
-				if (ret != 0) {
-					logthing(LOGTHING_ERROR,
-						"Problem deleting word: %s",
-						db_strerror(ret));
-				}
-			}
-
+				0);
 			if (ret != 0) {
 				logthing(LOGTHING_ERROR,
-					"Problem deleting word: %s",
+					"Problem storing word: %s",
 					db_strerror(ret));
 				if (ret == DB_LOCK_DEADLOCK) {
 					deadlock = true;
 				}
 			}
 		}
-		ret = cursor->c_close(cursor);
-		cursor = NULL;
 
 		/*
 		 * Free our UID and word lists.
@@ -835,16 +1079,13 @@ int delete_key(uint64_t keyid, bool intrans)
 		}
 		free(uids);
 		uids = NULL;
-		free_publickey(publickey);
-		publickey = NULL;
 	}
 
+	/*
+	 * Write the truncated 32 bit keyid so we can lookup the full id for
+	 * queries.
+	 */
 	if (!deadlock) {
-		ret = id32db->cursor(id32db,
-			txn,
-			&cursor,
-			0);   /* flags */
-
 		shortkeyid = keyid & 0xFFFFFFFF;
 
 		memset(&key, 0, sizeof(key));
@@ -854,29 +1095,22 @@ int delete_key(uint64_t keyid, bool intrans)
 		data.data = &keyid;
 		data.size = sizeof(keyid);
 
-		ret = cursor->c_get(cursor,
+		ret = id32db->put(id32db,
+			txn,
 			&key,
 			&data,
-			DB_GET_BOTH);
-
-		if (ret == 0) {
-			ret = cursor->c_del(cursor, 0);
-			if (ret != 0) {
-				logthing(LOGTHING_ERROR,
-					"Problem deleting short keyid: %s",
-					db_strerror(ret));
-			}
-		}
-
+			0);
 		if (ret != 0) {
 			logthing(LOGTHING_ERROR,
-				"Problem deleting short keyid: %s",
+				"Problem storing short keyid: %s",
 				db_strerror(ret));
 			if (ret == DB_LOCK_DEADLOCK) {
 				deadlock = true;
 			}
 		}
+	}
 
+	if (!deadlock) {
 		subkeyids = keysubkeys(publickey);
 		i = 0;
 		while (subkeyids != NULL && subkeyids[i] != 0) {
@@ -889,24 +1123,14 @@ int delete_key(uint64_t keyid, bool intrans)
 			data.data = &keyid;
 			data.size = sizeof(keyid);
 
-			ret = cursor->c_get(cursor,
+			ret = id32db->put(id32db,
+				txn,
 				&key,
 				&data,
-				DB_GET_BOTH);
-
-			if (ret == 0) {
-				ret = cursor->c_del(cursor, 0);
-				if (ret != 0) {
-					logthing(LOGTHING_ERROR,
-						"Problem deleting short"
-						" keyid: %s",
-						db_strerror(ret));
-				}
-			}
-
+				0);
 			if (ret != 0) {
 				logthing(LOGTHING_ERROR,
-					"Problem deleting short keyid: %s",
+					"Problem storing short keyid: %s",
 					db_strerror(ret));
 				if (ret == DB_LOCK_DEADLOCK) {
 					deadlock = true;
@@ -917,26 +1141,13 @@ int delete_key(uint64_t keyid, bool intrans)
 			free(subkeyids);
 			subkeyids = NULL;
 		}
-
-		ret = cursor->c_close(cursor);
-		cursor = NULL;
-	}
-
-	if (!deadlock) {
-		key.data = &keyid;
-		key.size = sizeof(keyid);
-
-		keydb(keyid)->del(keydb(keyid),
-				txn,
-				&key,
-				0); /* flags */
 	}
 
 	if (!intrans) {
-		endtrans();
+		db4_endtrans();
 	}
 
-	return deadlock ? (-1) : (ret == DB_NOTFOUND);
+	return deadlock ? -1 : 0 ;
 }
 
 /**
@@ -950,8 +1161,8 @@ int delete_key(uint64_t keyid, bool intrans)
  *
  *	Returns the number of keys we iterated over.
  */
-int iterate_keys(void (*iterfunc)(void *ctx, struct openpgp_publickey *key),
-		void *ctx)
+static int db4_iterate_keys(void (*iterfunc)(void *ctx,
+		struct openpgp_publickey *key),	void *ctx)
 {
 	DBT                         dbkey, data;
 	DBC                        *cursor = NULL;
@@ -1005,55 +1216,6 @@ int iterate_keys(void (*iterfunc)(void *ctx, struct openpgp_publickey *key),
 	return numkeys;
 }
 
-/**
- *	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)
-{
-	DBT       key, data;
-	DBC      *cursor = NULL;
-	uint32_t  shortkeyid = 0;
-	int       ret = 0;
-
-	if (keyid < 0x100000000LL) {
-		ret = id32db->cursor(id32db,
-				txn,
-				&cursor,
-				0);   /* flags */
-
-		shortkeyid = keyid & 0xFFFFFFFF;
-
-		memset(&key, 0, sizeof(key));
-		memset(&data, 0, sizeof(data));
-		key.data = &shortkeyid;
-		key.size = sizeof(shortkeyid);
-		data.flags = DB_DBT_MALLOC;
-
-		ret = cursor->c_get(cursor,
-			&key,
-			&data,
-			DB_SET);
-
-		if (ret == 0) {
-			keyid = *(uint64_t *) data.data;
-
-			if (data.data != NULL) {
-				free(data.data);
-				data.data = NULL;
-			}
-		}
-
-		ret = cursor->c_close(cursor);
-		cursor = NULL;
-	}
-	
-	return keyid;
-}
-
 /*
  * Include the basic keydb routines.
  */
@@ -1061,3 +1223,20 @@ uint64_t getfullkeyid(uint64_t keyid)
 #define NEED_KEYID2UID 1
 #define NEED_UPDATEKEYS 1
 #include "keydb.c"
+
+struct dbfuncs keydb_db4_funcs = {
+	.initdb			= db4_initdb,
+	.cleanupdb		= db4_cleanupdb,
+	.starttrans		= db4_starttrans,
+	.endtrans		= db4_endtrans,
+	.fetch_key		= db4_fetch_key,
+	.fetch_key_text		= db4_fetch_key_text,
+	.store_key		= db4_store_key,
+	.update_keys		= generic_update_keys,
+	.delete_key		= db4_delete_key,
+	.getkeysigs		= generic_getkeysigs,
+	.cached_getkeysigs	= generic_cached_getkeysigs,
+	.keyid2uid		= generic_keyid2uid,
+	.getfullkeyid		= db4_getfullkeyid,
+	.iterate_keys		= db4_iterate_keys,
+};