1 files changed, 161 insertions, 0 deletions
diff --git a/src/lookups/lmdb.c b/src/lookups/lmdb.c
new file mode 100644
index 0000000..4066751
--- /dev/null
+++ b/src/lookups/lmdb.c
@@ -0,0 +1,161 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 2016 - 2018 */
+/* Copyright (c) The Exim Maintainers 2020 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+#include "../exim.h"
+
+#ifdef EXPERIMENTAL_LMDB
+
+#include <lmdb.h>
+
+typedef struct lmdbstrct
+{
+MDB_txn *txn;
+MDB_dbi db_dbi;
+} Lmdbstrct;
+
+
+/*************************************************
+*              Open entry point                  *
+*************************************************/
+
+static void *
+lmdb_open(const uschar * filename, uschar ** errmsg)
+{
+MDB_env * db_env = NULL;
+Lmdbstrct * lmdb_p;
+int ret, save_errno;
+const uschar * errstr;
+
+lmdb_p = store_get(sizeof(Lmdbstrct), FALSE);
+lmdb_p->txn = NULL;
+
+if ((ret = mdb_env_create(&db_env)))
+  {
+  errstr = US"create environment";
+  goto bad;
+  }
+
+if ((ret = mdb_env_open(db_env, CS filename, MDB_NOSUBDIR|MDB_RDONLY, 0660)))
+  {
+  errstr = string_sprintf("open environment with %s", filename);
+  goto bad;
+  }
+
+if ((ret = mdb_txn_begin(db_env, NULL, MDB_RDONLY, &lmdb_p->txn)))
+  {
+  errstr = US"start transaction";
+  goto bad;
+  }
+
+if ((ret = mdb_open(lmdb_p->txn, NULL, 0, &lmdb_p->db_dbi)))
+  {
+  errstr = US"open database";
+  goto bad;
+  }
+
+return lmdb_p;
+
+bad:
+  save_errno = errno;
+  if (lmdb_p->txn) mdb_txn_abort(lmdb_p->txn);
+  if (db_env) mdb_env_close(db_env);
+  *errmsg = string_sprintf("LMDB: Unable to %s: %s", errstr,  mdb_strerror(ret));
+  errno = save_errno;
+  return NULL;
+}
+
+
+/*************************************************
+*              Find entry point                  *
+*************************************************/
+
+static int
+lmdb_find(void * handle, const uschar * filename,
+    const uschar * keystring, int length, uschar ** result, uschar ** errmsg,
+    uint * do_cache, const uschar * opts)
+{
+int ret;
+MDB_val dbkey, data;
+Lmdbstrct * lmdb_p = handle;
+
+dbkey.mv_data = CS keystring;
+dbkey.mv_size = length;
+
+DEBUG(D_lookup) debug_printf_indent("LMDB: lookup key: %s\n", CS keystring);
+
+if ((ret = mdb_get(lmdb_p->txn, lmdb_p->db_dbi, &dbkey, &data)) == 0)
+  {
+  *result = string_copyn(US data.mv_data, data.mv_size);
+  DEBUG(D_lookup) debug_printf_indent("LMDB: lookup result: %s\n", *result);
+  return OK;
+  }
+else if (ret == MDB_NOTFOUND)
+  {
+  *errmsg = US"LMDB: lookup, no data found";
+  DEBUG(D_lookup) debug_printf_indent("%s\n", *errmsg);
+  return FAIL;
+  }
+else
+  {
+  *errmsg = string_sprintf("LMDB: lookup error: %s", mdb_strerror(ret));
+  DEBUG(D_lookup) debug_printf_indent("%s\n", *errmsg);
+  return DEFER;
+  }
+}
+
+
+/*************************************************
+*              Close entry point                 *
+*************************************************/
+
+static void
+lmdb_close(void * handle)
+{
+Lmdbstrct * lmdb_p = handle;
+MDB_env * db_env = mdb_txn_env(lmdb_p->txn);
+mdb_txn_abort(lmdb_p->txn);
+mdb_env_close(db_env);
+}
+
+
+/*************************************************
+*         Version reporting entry point          *
+*************************************************/
+
+#include "../version.h"
+
+void
+lmdb_version_report(FILE * f)
+{
+fprintf(f, "Library version: LMDB: Compile: %d.%d.%d\n",
+    MDB_VERSION_MAJOR, MDB_VERSION_MINOR, MDB_VERSION_PATCH);
+#ifdef DYNLOOKUP
+fprintf(f, "                        Exim version %s\n", EXIM_VERSION_STR);
+#endif
+}
+
+static lookup_info lmdb_lookup_info = {
+  .name = US"lmdb",			/* lookup name */
+  .type = lookup_absfile,		/* query-style lookup */
+  .open = lmdb_open,			/* open function */
+  .check = NULL,			/* no check function */
+  .find = lmdb_find,			/* find function */
+  .close = lmdb_close,			/* close function */
+  .tidy = NULL,				/* tidy function */
+  .quote = NULL,			/* quoting function */
+  .version_report = lmdb_version_report           /* version reporting */
+};
+
+#ifdef DYNLOOKUP
+# define lmdb_lookup_module_info _lookup_module_info
+#endif /* DYNLOOKUP */
+
+static lookup_info *_lookup_list[] = { &lmdb_lookup_info };
+lookup_module_info lmdb_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 };
+
+#endif /* EXPERIMENTAL_LMDB */