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+/*++
+/* NAME
+/* postconf_user 3
+/* SUMMARY
+/* support for user-defined main.cf parameter names
+/* SYNOPSIS
+/* #include <postconf.h>
+/*
+/* void pcf_register_user_parameters()
+/* DESCRIPTION
+/* Postfix has multiple parameter name spaces: the global
+/* main.cf parameter name space, and the local parameter name
+/* space of each master.cf entry. Parameters in local name
+/* spaces take precedence over global parameters.
+/*
+/* There are three categories of known parameter names: built-in,
+/* service-defined (see postconf_service.c), and valid
+/* user-defined.
+/*
+/* There are two categories of valid user-defined parameter
+/* names:
+/*
+/* - Parameters whose user-defined-name appears in the value
+/* of smtpd_restriction_classes in main.cf or master.cf.
+/*
+/* - Parameters whose $user-defined-name appear in the value
+/* of "name=value" entries in main.cf or master.cf.
+/*
+/* - In both cases the parameters must have a
+/* "user-defined-name=value" entry in main.cf or master.cf.
+/*
+/* Other user-defined parameter names are flagged as "unused".
+/*
+/* pcf_register_user_parameters() scans the global and per-service
+/* name spaces for user-defined parameters and flags parameters
+/* as "valid" in the global name space (pcf_param_table) or
+/* in the per-service name space (valid_params).
+/*
+/* This function also invokes pcf_register_dbms_parameters() to
+/* to instantiate legacy per-dbms parameters, and to examine
+/* per-dbms configuration files. This is limited to the content
+/* of global and local, built-in and per-service, parameters.
+/* DIAGNOSTICS
+/* Problems are reported to the standard error stream.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*
+/* Wietse Venema
+/* Google, Inc.
+/* 111 8th Avenue
+/* New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <htable.h>
+#include <mac_expand.h>
+#include <stringops.h>
+
+/* Global library. */
+
+#include <mail_conf.h>
+#include <mail_params.h>
+
+/* Application-specific. */
+
+#include <postconf.h>
+
+ /*
+ * Hash with all user-defined names in the global smtpd_restriction_classes
+ * value. This is used when validating "-o user-defined-name=value" entries
+ * in master.cf.
+ */
+static HTABLE *pcf_rest_class_table;
+
+ /*
+ * SLMs.
+ */
+#define STR(x) vstring_str(x)
+
+ /*
+ * Macros to make code with obscure constants more readable.
+ */
+#define NO_SCAN_RESULT ((VSTRING *) 0)
+#define NO_SCAN_FILTER ((char *) 0)
+
+/* SCAN_USER_PARAMETER_VALUE - examine macro names in parameter value */
+
+#define SCAN_USER_PARAMETER_VALUE(value, class, scope) do { \
+ PCF_PARAM_CTX _ctx; \
+ _ctx.local_scope = (scope); \
+ _ctx.param_class = (class); \
+ (void) mac_expand(NO_SCAN_RESULT, (value), MAC_EXP_FLAG_SCAN, \
+ NO_SCAN_FILTER, pcf_flag_user_parameter_wrapper, (void *) &_ctx); \
+} while (0)
+
+/* pcf_convert_user_parameter - get user-defined parameter string value */
+
+static const char *pcf_convert_user_parameter(void *unused_ptr)
+{
+ return (""); /* can't happen */
+}
+
+/* pcf_flag_user_parameter - flag user-defined name "valid" if it has name=value */
+
+static const char *pcf_flag_user_parameter(const char *mac_name,
+ int param_class,
+ PCF_MASTER_ENT *local_scope)
+{
+ const char *source = local_scope ? MASTER_CONF_FILE : MAIN_CONF_FILE;
+ int user_supplied = 0;
+
+ /*
+ * If the name=value exists in the local (or global) name space, update
+ * the local (or global) "valid" parameter name table.
+ *
+ * Do not "validate" user-defined parameters whose name appears only as
+ * macro expansion; this is how Postfix historically implements backwards
+ * compatibility after a feature name change.
+ */
+ if (local_scope && dict_get(local_scope->all_params, mac_name)) {
+ user_supplied = 1;
+ /* $name in master.cf references name=value in master.cf. */
+ if (PCF_PARAM_TABLE_LOCATE(local_scope->valid_names, mac_name) == 0) {
+ PCF_PARAM_TABLE_ENTER(local_scope->valid_names, mac_name,
+ param_class, PCF_PARAM_NO_DATA,
+ pcf_convert_user_parameter);
+ if (msg_verbose)
+ msg_info("$%s in %s:%s validates %s=value in %s:%s",
+ mac_name, MASTER_CONF_FILE,
+ local_scope->name_space,
+ mac_name, MASTER_CONF_FILE,
+ local_scope->name_space);
+ }
+ } else if (mail_conf_lookup(mac_name) != 0) {
+ user_supplied = 1;
+ /* $name in main/master.cf references name=value in main.cf. */
+ if (PCF_PARAM_TABLE_LOCATE(pcf_param_table, mac_name) == 0) {
+ PCF_PARAM_TABLE_ENTER(pcf_param_table, mac_name, param_class,
+ PCF_PARAM_NO_DATA, pcf_convert_user_parameter);
+ if (msg_verbose) {
+ if (local_scope)
+ msg_info("$%s in %s:%s validates %s=value in %s",
+ mac_name, MASTER_CONF_FILE,
+ local_scope->name_space,
+ mac_name, MAIN_CONF_FILE);
+ else
+ msg_info("$%s in %s validates %s=value in %s",
+ mac_name, MAIN_CONF_FILE,
+ mac_name, MAIN_CONF_FILE);
+ }
+ }
+ }
+ if (local_scope == 0) {
+ for (local_scope = pcf_master_table; local_scope->argv; local_scope++) {
+ if (local_scope->all_params != 0
+ && dict_get(local_scope->all_params, mac_name) != 0) {
+ user_supplied = 1;
+ /* $name in main.cf references name=value in master.cf. */
+ if (PCF_PARAM_TABLE_LOCATE(local_scope->valid_names, mac_name) == 0) {
+ PCF_PARAM_TABLE_ENTER(local_scope->valid_names, mac_name,
+ param_class, PCF_PARAM_NO_DATA,
+ pcf_convert_user_parameter);
+ if (msg_verbose)
+ msg_info("$%s in %s validates %s=value in %s:%s",
+ mac_name, MAIN_CONF_FILE,
+ mac_name, MASTER_CONF_FILE,
+ local_scope->name_space);
+ }
+ }
+ }
+ }
+
+ /*
+ * Warn about a $name that has no user-supplied explicit value or
+ * Postfix-supplied default value. We don't enforce this for legacy DBMS
+ * parameters because they exist only for backwards compatibility, so we
+ * don't bother to figure out which parameters come without defaults.
+ */
+ if (user_supplied == 0 && (param_class & PCF_PARAM_FLAG_DBMS) == 0
+ && PCF_PARAM_TABLE_LOCATE(pcf_param_table, mac_name) == 0)
+ msg_warn("%s/%s: undefined parameter: %s",
+ var_config_dir, source, mac_name);
+ return (0);
+}
+
+/* pcf_flag_user_parameter_wrapper - mac_expand call-back helper */
+
+static const char *pcf_flag_user_parameter_wrapper(const char *mac_name,
+ int unused_mode,
+ void *context)
+{
+ PCF_PARAM_CTX *ctx = (PCF_PARAM_CTX *) context;
+
+ return (pcf_flag_user_parameter(mac_name, ctx->param_class, ctx->local_scope));
+}
+
+/* pcf_lookup_eval - generalized mail_conf_lookup_eval */
+
+static const char *pcf_lookup_eval(const char *dict_name, const char *name)
+{
+ const char *value;
+
+#define RECURSIVE 1
+
+ if ((value = dict_lookup(dict_name, name)) != 0)
+ value = dict_eval(dict_name, value, RECURSIVE);
+ return (value);
+}
+
+/* pcf_scan_user_parameter_namespace - scan parameters in name space */
+
+static void pcf_scan_user_parameter_namespace(const char *dict_name,
+ PCF_MASTER_ENT *local_scope)
+{
+ const char *myname = "pcf_scan_user_parameter_namespace";
+ const char *class_list;
+ char *saved_class_list;
+ char *cp;
+ DICT *dict;
+ char *param_name;
+ int how;
+ const char *cparam_name;
+ const char *cparam_value;
+ PCF_PARAM_NODE *node;
+ const char *source = local_scope ? MASTER_CONF_FILE : MAIN_CONF_FILE;
+
+ /*
+ * Flag parameter names in smtpd_restriction_classes as "valid", but only
+ * if they have a "name=value" entry. If we are in not in a local name
+ * space, update the global restriction class name table, so that we can
+ * query the global table from within a local master.cf name space.
+ */
+ if ((class_list = pcf_lookup_eval(dict_name, VAR_REST_CLASSES)) != 0) {
+ cp = saved_class_list = mystrdup(class_list);
+ while ((param_name = mystrtok(&cp, CHARS_COMMA_SP)) != 0) {
+ if (local_scope == 0
+ && htable_locate(pcf_rest_class_table, param_name) == 0)
+ htable_enter(pcf_rest_class_table, param_name, "");
+ pcf_flag_user_parameter(param_name, PCF_PARAM_FLAG_USER, local_scope);
+ }
+ myfree(saved_class_list);
+ }
+
+ /*
+ * For all "name=value" instances: a) if the name space is local and the
+ * name appears in the global restriction class table, flag the name as
+ * "valid" in the local name space; b) scan the value for macro
+ * expansions of unknown parameter names, and flag those parameter names
+ * as "valid" if they have a "name=value" entry.
+ *
+ * We delete name=value entries for read-only parameters, to maintain
+ * compatibility with Postfix programs that ignore such settings.
+ */
+ if ((dict = dict_handle(dict_name)) == 0)
+ msg_panic("%s: parameter dictionary %s not found",
+ myname, dict_name);
+ if (dict->sequence == 0)
+ msg_panic("%s: parameter dictionary %s has no iterator",
+ myname, dict_name);
+ for (how = DICT_SEQ_FUN_FIRST;
+ dict->sequence(dict, how, &cparam_name, &cparam_value) == 0;
+ how = DICT_SEQ_FUN_NEXT) {
+ if (local_scope != 0
+ && PCF_PARAM_TABLE_LOCATE(local_scope->valid_names, cparam_name) == 0
+ && htable_locate(pcf_rest_class_table, cparam_name) != 0)
+ PCF_PARAM_TABLE_ENTER(local_scope->valid_names, cparam_name,
+ PCF_PARAM_FLAG_USER, PCF_PARAM_NO_DATA,
+ pcf_convert_user_parameter);
+ if ((node = PCF_PARAM_TABLE_FIND(pcf_param_table, cparam_name)) != 0) {
+ if (PCF_READONLY_PARAMETER(node)) {
+ msg_warn("%s/%s: read-only parameter assignment: %s=%s",
+ var_config_dir, source, cparam_name, cparam_value);
+ /* Can't use dict_del() with Postfix<2.10 htable_sequence(). */
+ if (dict_del(dict, cparam_name) != 0)
+ msg_panic("%s: can't delete %s/%s parameter entry for %s",
+ myname, var_config_dir, source, cparam_name);
+ continue;
+ }
+ /* Re-label legacy parameter as user-defined, so it's printed. */
+ if (PCF_LEGACY_PARAMETER(node))
+ PCF_PARAM_CLASS_OVERRIDE(node, PCF_PARAM_FLAG_USER);
+ /* Skip "do not expand" parameters. */
+ if (PCF_RAW_PARAMETER(node))
+ continue;
+ }
+ SCAN_USER_PARAMETER_VALUE(cparam_value, PCF_PARAM_FLAG_USER, local_scope);
+#ifdef LEGACY_DBMS_SUPPORT
+
+ /*
+ * Scan global or local parameters that are built-in or per-service
+ * (when node == 0, the parameter doesn't exist in the global
+ * namespace and therefore it can't be built-in or per-service).
+ */
+ if (node != 0
+ && (PCF_BUILTIN_PARAMETER(node) || PCF_SERVICE_PARAMETER(node)))
+ pcf_register_dbms_parameters(cparam_value, pcf_flag_user_parameter,
+ local_scope);
+#endif
+ }
+}
+
+/* pcf_scan_default_parameter_values - scan parameters at implicit defaults */
+
+static void pcf_scan_default_parameter_values(HTABLE *valid_params,
+ const char *dict_name,
+ PCF_MASTER_ENT *local_scope)
+{
+ const char *myname = "pcf_scan_default_parameter_values";
+ PCF_PARAM_INFO **list;
+ PCF_PARAM_INFO **ht;
+ const char *param_value;
+
+ list = PCF_PARAM_TABLE_LIST(valid_params);
+ for (ht = list; *ht; ht++) {
+ /* Skip "do not expand" parameters. */
+ if (PCF_RAW_PARAMETER(PCF_PARAM_INFO_NODE(*ht)))
+ continue;
+ /* Skip parameters with a non-default value. */
+ if (dict_lookup(dict_name, PCF_PARAM_INFO_NAME(*ht)))
+ continue;
+ if ((param_value = pcf_convert_param_node(PCF_SHOW_DEFS, PCF_PARAM_INFO_NAME(*ht),
+ PCF_PARAM_INFO_NODE(*ht))) == 0)
+ msg_panic("%s: parameter %s has no default value",
+ myname, PCF_PARAM_INFO_NAME(*ht));
+ SCAN_USER_PARAMETER_VALUE(param_value, PCF_PARAM_FLAG_USER, local_scope);
+ /* No need to scan default values for legacy DBMS configuration. */
+ }
+ myfree((void *) list);
+}
+
+/* pcf_register_user_parameters - add parameters with user-defined names */
+
+void pcf_register_user_parameters(void)
+{
+ const char *myname = "pcf_register_user_parameters";
+ PCF_MASTER_ENT *masterp;
+ ARGV *argv;
+ char *arg;
+ char *aval;
+ int field;
+ char *saved_arg;
+ char *param_name;
+ char *param_value;
+ DICT *dict;
+
+ /*
+ * Sanity checks.
+ */
+ if (pcf_param_table == 0)
+ msg_panic("%s: global parameter table is not initialized", myname);
+ if (pcf_master_table == 0)
+ msg_panic("%s: master table is not initialized", myname);
+ if (pcf_rest_class_table != 0)
+ msg_panic("%s: restriction class table is already initialized", myname);
+
+ /*
+ * Initialize the table with global restriction class names.
+ */
+ pcf_rest_class_table = htable_create(1);
+
+ /*
+ * Initialize the per-service parameter name spaces.
+ */
+ for (masterp = pcf_master_table; (argv = masterp->argv) != 0; masterp++) {
+ for (field = PCF_MASTER_MIN_FIELDS; argv->argv[field] != 0; field++) {
+ arg = argv->argv[field];
+ if (arg[0] != '-' || strcmp(arg, "--") == 0)
+ break;
+ if (strchr(pcf_daemon_options_expecting_value, arg[1]) == 0
+ || (aval = argv->argv[field + 1]) == 0)
+ continue;
+ if (strcmp(arg, "-o") == 0) {
+ saved_arg = mystrdup(aval);
+ if (split_nameval(saved_arg, &param_name, &param_value) == 0)
+ dict_update(masterp->name_space, param_name, param_value);
+ myfree(saved_arg);
+ }
+ field += 1;
+ }
+ if ((dict = dict_handle(masterp->name_space)) != 0) {
+ masterp->all_params = dict;
+ masterp->valid_names = htable_create(1);
+ }
+ }
+
+ /*
+ * Scan the "-o parameter=value" instances in each master.cf name space.
+ */
+ for (masterp = pcf_master_table; masterp->argv != 0; masterp++)
+ if (masterp->all_params != 0)
+ pcf_scan_user_parameter_namespace(masterp->name_space, masterp);
+
+ /*
+ * Scan parameter values that are left at their defaults in the global
+ * name space. Some defaults contain the $name of an obsolete parameter
+ * for backwards compatilility purposes. We might warn that an explicit
+ * name=value is obsolete, but we must not warn that the parameter is
+ * unused.
+ */
+ pcf_scan_default_parameter_values(pcf_param_table, CONFIG_DICT,
+ (PCF_MASTER_ENT *) 0);
+
+ /*
+ * Scan the explicit name=value entries in the global name space.
+ */
+ pcf_scan_user_parameter_namespace(CONFIG_DICT, (PCF_MASTER_ENT *) 0);
+}