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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
commitb5896ba9f6047e7031e2bdee0622d543e11a6734 (patch)
treefd7b460593a2fee1be579bec5697e6d887ea3421 /src/global/dict_memcache.c
parentInitial commit. (diff)
downloadpostfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.tar.xz
postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.zip
Adding upstream version 3.4.23.upstream/3.4.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/global/dict_memcache.c')
-rw-r--r--src/global/dict_memcache.c599
1 files changed, 599 insertions, 0 deletions
diff --git a/src/global/dict_memcache.c b/src/global/dict_memcache.c
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+/*++
+/* NAME
+/* dict_memcache 3
+/* SUMMARY
+/* dictionary interface to memcaches
+/* SYNOPSIS
+/* #include <dict_memcache.h>
+/*
+/* DICT *dict_memcache_open(name, open_flags, dict_flags)
+/* const char *name;
+/* int open_flags;
+/* int dict_flags;
+/* DESCRIPTION
+/* dict_memcache_open() opens a memcache, providing
+/* a dictionary interface for Postfix key->value mappings.
+/* The result is a pointer to the installed dictionary.
+/*
+/* Configuration parameters are described in memcache_table(5).
+/*
+/* Arguments:
+/* .IP name
+/* The path to the Postfix memcache configuration file.
+/* .IP open_flags
+/* O_RDONLY or O_RDWR. This function ignores flags that don't
+/* specify a read, write or append mode.
+/* .IP dict_flags
+/* See dict_open(3).
+/* SEE ALSO
+/* dict(3) generic dictionary manager
+/* HISTORY
+/* .ad
+/* .fi
+/* The first memcache client for Postfix was written by Omar
+/* Kilani, and was based on libmemcache. The current
+/* implementation implements the memcache protocol directly,
+/* and bears no resemblance to earlier work.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <errno.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdio.h> /* XXX sscanf() */
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <dict.h>
+#include <vstring.h>
+#include <stringops.h>
+#include <auto_clnt.h>
+#include <vstream.h>
+
+/* Global library. */
+
+#include <cfg_parser.h>
+#include <db_common.h>
+#include <memcache_proto.h>
+
+/* Application-specific. */
+
+#include <dict_memcache.h>
+
+ /*
+ * Structure of one memcache dictionary handle.
+ */
+typedef struct {
+ DICT dict; /* parent class */
+ CFG_PARSER *parser; /* common parameter parser */
+ void *dbc_ctxt; /* db_common context */
+ char *key_format; /* query key translation */
+ int timeout; /* client timeout */
+ int mc_ttl; /* memcache update expiration */
+ int mc_flags; /* memcache update flags */
+ int err_pause; /* delay between errors */
+ int max_tries; /* number of tries */
+ int max_line; /* reply line limit */
+ int max_data; /* reply data limit */
+ char *memcache; /* memcache server spec */
+ AUTO_CLNT *clnt; /* memcache client stream */
+ VSTRING *clnt_buf; /* memcache client buffer */
+ VSTRING *key_buf; /* lookup key */
+ VSTRING *res_buf; /* lookup result */
+ int error; /* memcache dict_errno */
+ DICT *backup; /* persistent backup */
+} DICT_MC;
+
+ /*
+ * Memcache option defaults and names.
+ */
+#define DICT_MC_DEF_HOST "localhost"
+#define DICT_MC_DEF_PORT "11211"
+#define DICT_MC_DEF_MEMCACHE "inet:" DICT_MC_DEF_HOST ":" DICT_MC_DEF_PORT
+#define DICT_MC_DEF_KEY_FMT "%s"
+#define DICT_MC_DEF_MC_TTL 3600
+#define DICT_MC_DEF_MC_TIMEOUT 2
+#define DICT_MC_DEF_MC_FLAGS 0
+#define DICT_MC_DEF_MAX_TRY 2
+#define DICT_MC_DEF_MAX_LINE 1024
+#define DICT_MC_DEF_MAX_DATA 10240
+#define DICT_MC_DEF_ERR_PAUSE 1
+
+#define DICT_MC_NAME_MEMCACHE "memcache"
+#define DICT_MC_NAME_BACKUP "backup"
+#define DICT_MC_NAME_KEY_FMT "key_format"
+#define DICT_MC_NAME_MC_TTL "ttl"
+#define DICT_MC_NAME_MC_TIMEOUT "timeout"
+#define DICT_MC_NAME_MC_FLAGS "flags"
+#define DICT_MC_NAME_MAX_TRY "max_try"
+#define DICT_MC_NAME_MAX_LINE "line_size_limit"
+#define DICT_MC_NAME_MAX_DATA "data_size_limit"
+#define DICT_MC_NAME_ERR_PAUSE "retry_pause"
+
+ /*
+ * SLMs.
+ */
+#define STR(x) vstring_str(x)
+#define LEN(x) VSTRING_LEN(x)
+
+/*#define msg_verbose 1*/
+
+/* dict_memcache_set - set memcache key/value */
+
+static int dict_memcache_set(DICT_MC *dict_mc, const char *value, int ttl)
+{
+ VSTREAM *fp;
+ int count;
+ size_t data_len = strlen(value);
+
+ /*
+ * Return a permanent error if we can't store this data. This results in
+ * loss of information.
+ */
+ if (data_len > dict_mc->max_data) {
+ msg_warn("database %s:%s: data for key %s is too long (%s=%d) "
+ "-- not stored", DICT_TYPE_MEMCACHE, dict_mc->dict.name,
+ STR(dict_mc->key_buf), DICT_MC_NAME_MAX_DATA,
+ dict_mc->max_data);
+ /* Not stored! */
+ DICT_ERR_VAL_RETURN(dict_mc, DICT_ERR_NONE, DICT_STAT_FAIL);
+ }
+ for (count = 0; count < dict_mc->max_tries; count++) {
+ if (count > 0)
+ sleep(dict_mc->err_pause);
+ if ((fp = auto_clnt_access(dict_mc->clnt)) == 0) {
+ break;
+ } else if (memcache_printf(fp, "set %s %d %d %ld",
+ STR(dict_mc->key_buf), dict_mc->mc_flags,
+ ttl, (long) data_len) < 0
+ || memcache_fwrite(fp, value, strlen(value)) < 0
+ || memcache_get(fp, dict_mc->clnt_buf,
+ dict_mc->max_line) < 0) {
+ if (count > 0)
+ msg_warn(errno ? "database %s:%s: I/O error: %m" :
+ "database %s:%s: I/O error",
+ DICT_TYPE_MEMCACHE, dict_mc->dict.name);
+ } else if (strcmp(STR(dict_mc->clnt_buf), "STORED") != 0) {
+ if (count > 0)
+ msg_warn("database %s:%s: update failed: %.30s",
+ DICT_TYPE_MEMCACHE, dict_mc->dict.name,
+ STR(dict_mc->clnt_buf));
+ } else {
+ /* Victory! */
+ DICT_ERR_VAL_RETURN(dict_mc, DICT_ERR_NONE, DICT_STAT_SUCCESS);
+ }
+ auto_clnt_recover(dict_mc->clnt);
+ }
+ DICT_ERR_VAL_RETURN(dict_mc, DICT_ERR_RETRY, DICT_STAT_ERROR);
+}
+
+/* dict_memcache_get - get memcache key/value */
+
+static const char *dict_memcache_get(DICT_MC *dict_mc)
+{
+ VSTREAM *fp;
+ long todo;
+ int count;
+
+ for (count = 0; count < dict_mc->max_tries; count++) {
+ if (count > 0)
+ sleep(dict_mc->err_pause);
+ if ((fp = auto_clnt_access(dict_mc->clnt)) == 0) {
+ break;
+ } else if (memcache_printf(fp, "get %s", STR(dict_mc->key_buf)) < 0
+ || memcache_get(fp, dict_mc->clnt_buf, dict_mc->max_line) < 0) {
+ if (count > 0)
+ msg_warn(errno ? "database %s:%s: I/O error: %m" :
+ "database %s:%s: I/O error",
+ DICT_TYPE_MEMCACHE, dict_mc->dict.name);
+ } else if (strcmp(STR(dict_mc->clnt_buf), "END") == 0) {
+ /* Not found. */
+ DICT_ERR_VAL_RETURN(dict_mc, DICT_ERR_NONE, (char *) 0);
+ } else if (sscanf(STR(dict_mc->clnt_buf),
+ "VALUE %*s %*s %ld", &todo) != 1
+ || todo < 0 || todo > dict_mc->max_data) {
+ if (count > 0)
+ msg_warn("%s: unexpected memcache server reply: %.30s",
+ dict_mc->dict.name, STR(dict_mc->clnt_buf));
+ } else if (memcache_fread(fp, dict_mc->res_buf, todo) < 0) {
+ if (count > 0)
+ msg_warn("%s: EOF receiving memcache server reply",
+ dict_mc->dict.name);
+ } else {
+ /* Victory! */
+ if (memcache_get(fp, dict_mc->clnt_buf, dict_mc->max_line) < 0
+ || strcmp(STR(dict_mc->clnt_buf), "END") != 0)
+ auto_clnt_recover(dict_mc->clnt);
+ DICT_ERR_VAL_RETURN(dict_mc, DICT_ERR_NONE, STR(dict_mc->res_buf));
+ }
+ auto_clnt_recover(dict_mc->clnt);
+ }
+ DICT_ERR_VAL_RETURN(dict_mc, DICT_ERR_RETRY, (char *) 0);
+}
+
+/* dict_memcache_del - delete memcache key/value */
+
+static int dict_memcache_del(DICT_MC *dict_mc)
+{
+ VSTREAM *fp;
+ int count;
+
+ for (count = 0; count < dict_mc->max_tries; count++) {
+ if (count > 0)
+ sleep(dict_mc->err_pause);
+ if ((fp = auto_clnt_access(dict_mc->clnt)) == 0) {
+ break;
+ } else if (memcache_printf(fp, "delete %s", STR(dict_mc->key_buf)) < 0
+ || memcache_get(fp, dict_mc->clnt_buf, dict_mc->max_line) < 0) {
+ if (count > 0)
+ msg_warn(errno ? "database %s:%s: I/O error: %m" :
+ "database %s:%s: I/O error",
+ DICT_TYPE_MEMCACHE, dict_mc->dict.name);
+ } else if (strcmp(STR(dict_mc->clnt_buf), "DELETED") == 0) {
+ /* Victory! */
+ DICT_ERR_VAL_RETURN(dict_mc, DICT_ERR_NONE, DICT_STAT_SUCCESS);
+ } else if (strcmp(STR(dict_mc->clnt_buf), "NOT_FOUND") == 0) {
+ /* Not found! */
+ DICT_ERR_VAL_RETURN(dict_mc, DICT_ERR_NONE, DICT_STAT_FAIL);
+ } else {
+ if (count > 0)
+ msg_warn("database %s:%s: delete failed: %.30s",
+ DICT_TYPE_MEMCACHE, dict_mc->dict.name,
+ STR(dict_mc->clnt_buf));
+ }
+ auto_clnt_recover(dict_mc->clnt);
+ }
+ DICT_ERR_VAL_RETURN(dict_mc, DICT_ERR_RETRY, DICT_STAT_ERROR);
+}
+
+/* dict_memcache_prepare_key - prepare lookup key */
+
+static ssize_t dict_memcache_prepare_key(DICT_MC *dict_mc, const char *name)
+{
+
+ /*
+ * Optionally case-fold the search string.
+ */
+ if (dict_mc->dict.flags & DICT_FLAG_FOLD_FIX) {
+ if (dict_mc->dict.fold_buf == 0)
+ dict_mc->dict.fold_buf = vstring_alloc(10);
+ vstring_strcpy(dict_mc->dict.fold_buf, name);
+ name = lowercase(STR(dict_mc->dict.fold_buf));
+ }
+
+ /*
+ * Optionally expand the query key format.
+ */
+#define DICT_MC_NO_KEY (0)
+#define DICT_MC_NO_QUOTING ((void (*)(DICT *, const char *, VSTRING *)) 0)
+
+ if (dict_mc->key_format != 0
+ && strcmp(dict_mc->key_format, DICT_MC_DEF_KEY_FMT) != 0) {
+ VSTRING_RESET(dict_mc->key_buf);
+ if (db_common_expand(dict_mc->dbc_ctxt, dict_mc->key_format,
+ name, DICT_MC_NO_KEY, dict_mc->key_buf,
+ DICT_MC_NO_QUOTING) == 0)
+ return (0);
+ } else {
+ vstring_strcpy(dict_mc->key_buf, name);
+ }
+
+ /*
+ * The length indicates whether the expansion is empty or not.
+ */
+ return (LEN(dict_mc->key_buf));
+}
+
+/* dict_memcache_valid_key - validate key */
+
+static int dict_memcache_valid_key(DICT_MC *dict_mc,
+ const char *name,
+ const char *operation,
+ void (*log_func) (const char *,...))
+{
+ unsigned char *cp;
+ int rc;
+
+#define DICT_MC_SKIP(why) do { \
+ if (msg_verbose || log_func != msg_info) \
+ log_func("%s: skipping %s for name \"%s\": %s", \
+ dict_mc->dict.name, operation, name, (why)); \
+ DICT_ERR_VAL_RETURN(dict_mc, DICT_ERR_NONE, 0); \
+ } while (0)
+
+ if (*name == 0)
+ DICT_MC_SKIP("empty lookup key");
+ if ((rc = db_common_check_domain(dict_mc->dbc_ctxt, name)) == 0)
+ DICT_MC_SKIP("domain mismatch");
+ if (rc < 0)
+ DICT_ERR_VAL_RETURN(dict_mc, rc, 0);
+ if (dict_memcache_prepare_key(dict_mc, name) == 0)
+ DICT_MC_SKIP("empty lookup key expansion");
+ for (cp = (unsigned char *) STR(dict_mc->key_buf); *cp; cp++)
+ if (isascii(*cp) && isspace(*cp))
+ DICT_MC_SKIP("name contains space");
+
+ DICT_ERR_VAL_RETURN(dict_mc, DICT_ERR_NONE, 1);
+}
+
+/* dict_memcache_update - update memcache */
+
+static int dict_memcache_update(DICT *dict, const char *name,
+ const char *value)
+{
+ const char *myname = "dict_memcache_update";
+ DICT_MC *dict_mc = (DICT_MC *) dict;
+ DICT *backup = dict_mc->backup;
+ int upd_res;
+
+ /*
+ * Skip updates with an inapplicable key, noisily. This results in loss
+ * of information.
+ */
+ if (dict_memcache_valid_key(dict_mc, name, "update", msg_warn) == 0)
+ DICT_ERR_VAL_RETURN(dict, dict_mc->error, DICT_STAT_FAIL);
+
+ /*
+ * Update the memcache first.
+ */
+ upd_res = dict_memcache_set(dict_mc, value, dict_mc->mc_ttl);
+ dict->error = dict_mc->error;
+
+ /*
+ * Update the backup database last.
+ */
+ if (backup) {
+ upd_res = backup->update(backup, name, value);
+ dict->error = backup->error;
+ }
+ if (msg_verbose)
+ msg_info("%s: %s: update key \"%s\"(%s) => \"%s\" %s",
+ myname, dict_mc->dict.name, name, STR(dict_mc->key_buf),
+ value, dict_mc->error ? "(memcache error)" : (backup
+ && backup->error) ? "(backup error)" : "(no error)");
+
+ return (upd_res);
+}
+
+/* dict_memcache_lookup - lookup memcache */
+
+static const char *dict_memcache_lookup(DICT *dict, const char *name)
+{
+ const char *myname = "dict_memcache_lookup";
+ DICT_MC *dict_mc = (DICT_MC *) dict;
+ DICT *backup = dict_mc->backup;
+ const char *retval;
+
+ /*
+ * Skip lookups with an inapplicable key, silently. This is just asking
+ * for information that cannot exist.
+ */
+ if (dict_memcache_valid_key(dict_mc, name, "lookup", msg_info) == 0)
+ DICT_ERR_VAL_RETURN(dict, dict_mc->error, (char *) 0);
+
+ /*
+ * Search the memcache first.
+ */
+ retval = dict_memcache_get(dict_mc);
+ dict->error = dict_mc->error;
+
+ /*
+ * Search the backup database last. Update the memcache if the data is
+ * found.
+ */
+ if (backup) {
+ backup->error = 0;
+ if (retval == 0) {
+ retval = backup->lookup(backup, name);
+ dict->error = backup->error;
+ /* Update the cache. */
+ if (retval != 0)
+ dict_memcache_set(dict_mc, retval, dict_mc->mc_ttl);
+ }
+ }
+ if (msg_verbose)
+ msg_info("%s: %s: key \"%s\"(%s) => %s",
+ myname, dict_mc->dict.name, name, STR(dict_mc->key_buf),
+ retval ? retval : dict_mc->error ? "(memcache error)" :
+ (backup && backup->error) ? "(backup error)" : "(not found)");
+
+ return (retval);
+}
+
+/* dict_memcache_delete - delete memcache entry */
+
+static int dict_memcache_delete(DICT *dict, const char *name)
+{
+ const char *myname = "dict_memcache_delete";
+ DICT_MC *dict_mc = (DICT_MC *) dict;
+ DICT *backup = dict_mc->backup;
+ int del_res;
+
+ /*
+ * Skip lookups with an inapplicable key, noisily. This is just deleting
+ * information that cannot exist.
+ */
+ if (dict_memcache_valid_key(dict_mc, name, "delete", msg_info) == 0)
+ DICT_ERR_VAL_RETURN(dict, dict_mc->error, dict_mc->error ?
+ DICT_STAT_ERROR : DICT_STAT_FAIL);
+
+ /*
+ * Update the memcache first.
+ */
+ del_res = dict_memcache_del(dict_mc);
+ dict->error = dict_mc->error;
+
+ /*
+ * Update the persistent database last.
+ */
+ if (backup) {
+ del_res = backup->delete(backup, name);
+ dict->error = backup->error;
+ }
+ if (msg_verbose)
+ msg_info("%s: %s: delete key \"%s\"(%s) => %s",
+ myname, dict_mc->dict.name, name, STR(dict_mc->key_buf),
+ dict_mc->error ? "(memcache error)" : (backup
+ && backup->error) ? "(backup error)" : "(no error)");
+
+ return (del_res);
+}
+
+/* dict_memcache_sequence - first/next lookup */
+
+static int dict_memcache_sequence(DICT *dict, int function, const char **key,
+ const char **value)
+{
+ const char *myname = "dict_memcache_sequence";
+ DICT_MC *dict_mc = (DICT_MC *) dict;
+ DICT *backup = dict_mc->backup;
+ int seq_res;
+
+ if (backup == 0) {
+ msg_warn("database %s:%s: first/next support requires backup database",
+ DICT_TYPE_MEMCACHE, dict_mc->dict.name);
+ DICT_ERR_VAL_RETURN(dict, DICT_ERR_NONE, DICT_STAT_FAIL);
+ } else {
+ seq_res = backup->sequence(backup, function, key, value);
+ if (msg_verbose)
+ msg_info("%s: %s: key \"%s\" => %s",
+ myname, dict_mc->dict.name, *key ? *key : "(not found)",
+ *value ? *value : backup->error ? "(backup error)" :
+ "(not found)");
+ DICT_ERR_VAL_RETURN(dict, backup->error, seq_res);
+ }
+}
+
+/* dict_memcache_close - close memcache */
+
+static void dict_memcache_close(DICT *dict)
+{
+ DICT_MC *dict_mc = (DICT_MC *) dict;
+
+ cfg_parser_free(dict_mc->parser);
+ db_common_free_ctx(dict_mc->dbc_ctxt);
+ if (dict_mc->key_format)
+ myfree(dict_mc->key_format);
+ myfree(dict_mc->memcache);
+ auto_clnt_free(dict_mc->clnt);
+ vstring_free(dict_mc->clnt_buf);
+ vstring_free(dict_mc->key_buf);
+ vstring_free(dict_mc->res_buf);
+ if (dict->fold_buf)
+ vstring_free(dict->fold_buf);
+ if (dict_mc->backup)
+ dict_close(dict_mc->backup);
+ dict_free(dict);
+}
+
+/* dict_memcache_open - open memcache */
+
+DICT *dict_memcache_open(const char *name, int open_flags, int dict_flags)
+{
+ DICT_MC *dict_mc;
+ char *backup;
+ CFG_PARSER *parser;
+
+ /*
+ * Sanity checks.
+ */
+ if (dict_flags & DICT_FLAG_NO_UNAUTH)
+ return (dict_surrogate(DICT_TYPE_MEMCACHE, name, open_flags, dict_flags,
+ "%s:%s map is not allowed for security-sensitive data",
+ DICT_TYPE_MEMCACHE, name));
+ open_flags &= (O_RDONLY | O_RDWR | O_WRONLY | O_APPEND);
+ if (open_flags != O_RDONLY && open_flags != O_RDWR)
+ return (dict_surrogate(DICT_TYPE_MEMCACHE, name, open_flags, dict_flags,
+ "%s:%s map requires O_RDONLY or O_RDWR access mode",
+ DICT_TYPE_MEMCACHE, name));
+
+ /*
+ * Open the configuration file.
+ */
+ if ((parser = cfg_parser_alloc(name)) == 0)
+ return (dict_surrogate(DICT_TYPE_MEMCACHE, name, open_flags, dict_flags,
+ "open %s: %m", name));
+
+ /*
+ * Create the dictionary object.
+ */
+ dict_mc = (DICT_MC *) dict_alloc(DICT_TYPE_MEMCACHE, name,
+ sizeof(*dict_mc));
+ dict_mc->dict.lookup = dict_memcache_lookup;
+ if (open_flags == O_RDWR) {
+ dict_mc->dict.update = dict_memcache_update;
+ dict_mc->dict.delete = dict_memcache_delete;
+ }
+ dict_mc->dict.sequence = dict_memcache_sequence;
+ dict_mc->dict.close = dict_memcache_close;
+ dict_mc->dict.flags = dict_flags;
+ dict_mc->key_buf = vstring_alloc(10);
+ dict_mc->res_buf = vstring_alloc(10);
+
+ /*
+ * Parse the configuration file.
+ */
+ dict_mc->parser = parser;
+ dict_mc->key_format = cfg_get_str(dict_mc->parser, DICT_MC_NAME_KEY_FMT,
+ DICT_MC_DEF_KEY_FMT, 0, 0);
+ dict_mc->timeout = cfg_get_int(dict_mc->parser, DICT_MC_NAME_MC_TIMEOUT,
+ DICT_MC_DEF_MC_TIMEOUT, 0, 0);
+ dict_mc->mc_ttl = cfg_get_int(dict_mc->parser, DICT_MC_NAME_MC_TTL,
+ DICT_MC_DEF_MC_TTL, 0, 0);
+ dict_mc->mc_flags = cfg_get_int(dict_mc->parser, DICT_MC_NAME_MC_FLAGS,
+ DICT_MC_DEF_MC_FLAGS, 0, 0);
+ dict_mc->err_pause = cfg_get_int(dict_mc->parser, DICT_MC_NAME_ERR_PAUSE,
+ DICT_MC_DEF_ERR_PAUSE, 1, 0);
+ dict_mc->max_tries = cfg_get_int(dict_mc->parser, DICT_MC_NAME_MAX_TRY,
+ DICT_MC_DEF_MAX_TRY, 1, 0);
+ dict_mc->max_line = cfg_get_int(dict_mc->parser, DICT_MC_NAME_MAX_LINE,
+ DICT_MC_DEF_MAX_LINE, 1, 0);
+ dict_mc->max_data = cfg_get_int(dict_mc->parser, DICT_MC_NAME_MAX_DATA,
+ DICT_MC_DEF_MAX_DATA, 1, 0);
+ dict_mc->memcache = cfg_get_str(dict_mc->parser, DICT_MC_NAME_MEMCACHE,
+ DICT_MC_DEF_MEMCACHE, 0, 0);
+
+ /*
+ * Initialize the memcache client.
+ */
+ dict_mc->clnt = auto_clnt_create(dict_mc->memcache, dict_mc->timeout, 0, 0);
+ dict_mc->clnt_buf = vstring_alloc(100);
+
+ /*
+ * Open the optional backup database.
+ */
+ backup = cfg_get_str(dict_mc->parser, DICT_MC_NAME_BACKUP,
+ (char *) 0, 0, 0);
+ if (backup) {
+ dict_mc->backup = dict_open(backup, open_flags, dict_flags);
+ myfree(backup);
+ } else
+ dict_mc->backup = 0;
+
+ /*
+ * Parse templates and common database parameters. Maps that use
+ * substring keys should only be used with the full input key.
+ */
+ dict_mc->dbc_ctxt = 0;
+ db_common_parse(&dict_mc->dict, &dict_mc->dbc_ctxt,
+ dict_mc->key_format, 1);
+ db_common_parse_domain(dict_mc->parser, dict_mc->dbc_ctxt);
+ if (db_common_dict_partial(dict_mc->dbc_ctxt))
+ /* Breaks recipient delimiters */
+ dict_mc->dict.flags |= DICT_FLAG_PATTERN;
+ else
+ dict_mc->dict.flags |= DICT_FLAG_FIXED;
+
+ dict_mc->dict.flags |= DICT_FLAG_MULTI_WRITER;
+
+ return (&dict_mc->dict);
+}