configuration values can be retrieved in the script via selects:

@cfg_get.<group_name>.<var_name>

cfg/cfg_select.c

@@ -0,0 +1,105 @@
+/*
+ * $Id$
+ *
+ * Copyright (C) 2008 iptelorg GmbH
+ *
+ * This file is part of ser, a free SIP server.
+ *
+ * ser is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version
+ *
+ * For a license to use the ser software under conditions
+ * other than those described here, or to purchase support for this
+ * software, please contact iptel.org by e-mail at the following addresses:
+ *    [email protected]
+ *
+ * ser is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * History
+ * -------
+ *  2008-01-10	Initial version (Miklos)
+ */
+
+#include "../select.h"
+#include "../ut.h"
+#include "cfg_struct.h"
+#include "cfg_select.h"
+
+int select_cfg_var(str *res, select_t *s, struct sip_msg *msg)
+{
+	cfg_group_t	*group;
+	cfg_mapping_t	*var;
+	void		*p;
+	int		i;
+
+	if (msg == NULL) {
+		/* fixup call */
+
+		/* two parameters are mandatory, group name and variable name */
+		if (s->n != 3) {
+			LOG(L_ERR, "ERROR: select_cfg_var(): two parameters are expected\n");
+			return -1;
+		}
+
+		if ((s->params[1].type != SEL_PARAM_STR)
+		|| (s->params[2].type != SEL_PARAM_STR)) {
+			LOG(L_ERR, "ERROR: select_cfg_var(): string parameters are expected\n");
+			return -1;
+		}
+
+		/* look-up the group and the variable */
+		if (cfg_lookup_var(&s->params[1].v.s, &s->params[2].v.s, &group, &var)) {
+			LOG(L_ERR, "ERROR: select_cfg_var(): unknown variable\n");
+			return -1;
+		}
+
+		if (var->def->on_change_cb) {
+			/* fixup function is defined -- safer to return an error
+			than an incorrect value */
+			LOG(L_ERR, "ERROR: select_cfg_var(): variable cannot be retrieved\n");
+			return -1;
+		}
+
+		s->params[1].type = SEL_PARAM_PTR;
+		s->params[1].v.p = (void *)group;
+
+		s->params[2].type = SEL_PARAM_PTR;
+		s->params[2].v.p = (void *)var;
+		return 1;
+	}
+
+	group = (cfg_group_t *)s->params[1].v.p;
+	var = (cfg_mapping_t *)s->params[2].v.p;
+
+	/* use the module's handle to access the variable, so the variables
+	are read from private memory */
+	p = *(group->handle) + var->offset;
+
+	switch (CFG_VAR_TYPE(var)) {
+	case CFG_VAR_INT:
+		memcpy(&i, p, sizeof(int));
+		/* WARNING: int2str uses a static buffer */
+		res->s = int2str(i, &res->len);
+		break;
+
+	case CFG_VAR_STRING:
+		memcpy(&res->s, p, sizeof(char *));
+		res->len = strlen(res->s);
+		break;
+
+	case CFG_VAR_STR:
+		memcpy(res, p, sizeof(str));
+		break;
+
+	}
+	return 0;
+}

cfg/cfg_select.h

@@ -0,0 +1,37 @@
+/*
+ * $Id$
+ *
+ * Copyright (C) 2008 iptelorg GmbH
+ *
+ * This file is part of ser, a free SIP server.
+ *
+ * ser is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version
+ *
+ * For a license to use the ser software under conditions
+ * other than those described here, or to purchase support for this
+ * software, please contact iptel.org by e-mail at the following addresses:
+ *    [email protected]
+ *
+ * ser is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * History
+ * -------
+ *  2008-01-10	Initial version (Miklos)
+ */
+
+#ifndef _CFG_SELECT_H
+#define _CFG_SELECT_H
+
+int select_cfg_var(str *res, select_t *s, struct sip_msg *msg);
+
+#endif /* _CFG_SELECT_H */

select_core.h

@@ -208,6 +208,8 @@ SELECT_F(select_date)
 SELECT_F(select_identity)
 SELECT_F(select_identity_info)
 
+SELECT_F(select_cfg_var)
+
 static select_row_t select_core[] = {
 	{ NULL, SEL_PARAM_STR, STR_STATIC_INIT("ruri"), select_ruri, 0}, /* not the same as request.uri because it is involved by new_uri */
 	{ NULL, SEL_PARAM_STR, STR_STATIC_INIT("request_uri"), select_ruri, 0},
@@ -395,6 +397,8 @@ static select_row_t select_core[] = {
 	{ NULL, SEL_PARAM_STR, STR_STATIC_INIT("identity"), select_identity, 0},
 	{ NULL, SEL_PARAM_STR, STR_STATIC_INIT("identity_info"), select_identity_info, 0},
 
+	{ NULL, SEL_PARAM_STR, STR_STATIC_INIT("cfg_get"), select_cfg_var, CONSUME_ALL | FIXUP_CALL },
+
 	{ NULL, SEL_PARAM_INT, STR_NULL, NULL, 0}
 };