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/*++
/* NAME
/* postconf_lookup 3
/* SUMMARY
/* parameter lookup routines
/* SYNOPSIS
/* #include <postconf.h>
/*
/* const char *pcf_lookup_parameter_value(mode, name, local_scope, node)
/* int mode;
/* const char *name;
/* PCF_MASTER_ENT *local_scope;
/* PCF_PARAM_NODE *node;
/*
/* char *pcf_expand_parameter_value(buf, mode, value, local_scope)
/* VSTRING *buf;
/* int mode;
/* const char *value;
/* PCF_MASTER_ENT *local_scope;
/* DESCRIPTION
/* These functions perform parameter value lookups. The order
/* of decreasing precedence is:
/* .IP \(bu
/* Search name=value parameter settings in master.cf. These
/* lookups are disabled with the PCF_SHOW_DEFS flag.
/* .IP \(bu
/* Search name=value parameter settings in main.cf. These
/* lookups are disabled with the PCF_SHOW_DEFS flag.
/* .IP \(bu
/* Search built-in default parameter settings. These lookups
/* are disabled with the PCF_SHOW_NONDEF flag.
/* .PP
/* pcf_lookup_parameter_value() looks up the value for the
/* named parameter, and returns null if the name was not found.
/*
/* pcf_expand_parameter_value() expands $name in the specified
/* parameter value. This function ignores the PCF_SHOW_NONDEF
/* flag. The result value is a pointer to storage in a
/* user-supplied buffer, or in a buffer that is overwritten
/* with each call.
/*
/* Arguments:
/* .IP buf
/* Null buffer pointer, or pointer to user-supplied buffer.
/* .IP mode
/* Bit-wise OR of zero or one of the following (other flags
/* are ignored):
/* .RS
/* .IP PCF_SHOW_DEFS
/* Search built-in default parameter settings only.
/* .IP PCF_SHOW_NONDEF
/* Search local (master.cf) and global (main.cf) name=value
/* parameter settings only.
/* .RE
/* .IP name
/* The name of a parameter to be looked up.
/* .IP value
/* The parameter value where $name should be expanded.
/* .IP local_scope
/* Pointer to master.cf entry with local name=value settings,
/* or a null pointer (i.e. no local parameter lookup).
/* .IP node
/* Global default value for the named parameter, or a null
/* pointer (i.e. do the global default lookup anyway).
/* 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 <vstring.h>
#include <dict.h>
#include <stringops.h>
#include <mac_expand.h>
/* Global library. */
#include <mail_conf.h>
/* Application-specific. */
#include <postconf.h>
#define STR(x) vstring_str(x)
/* pcf_lookup_parameter_value - look up specific parameter value */
const char *pcf_lookup_parameter_value(int mode, const char *name,
PCF_MASTER_ENT *local_scope,
PCF_PARAM_NODE *node)
{
const char *value = 0;
#define LOOKUP(dict, name) ((dict) ? dict_get((dict), (name)) : 0)
/*
* Local name=value entries in master.cf take precedence over global
* name=value entries in main.cf. Built-in defaults have the lowest
* precedence.
*/
if ((mode & PCF_SHOW_DEFS) != 0
|| ((local_scope == 0
|| ((value = LOOKUP(local_scope->ro_params, name)) == 0
&& (value = LOOKUP(local_scope->all_params, name)) == 0))
&& (value = dict_lookup(CONFIG_DICT, name)) == 0
&& (mode & PCF_SHOW_NONDEF) == 0)) {
if (node != 0 || (node = PCF_PARAM_TABLE_FIND(pcf_param_table, name)) != 0)
value = pcf_convert_param_node(PCF_SHOW_DEFS, name, node);
}
return (value);
}
/*
* Data structure to pass private state while recursively expanding $name in
* parameter values.
*/
typedef struct {
int mode;
PCF_MASTER_ENT *local_scope;
} PCF_EVAL_CTX;
/* pcf_lookup_parameter_value_wrapper - macro parser call-back routine */
static const char *pcf_lookup_parameter_value_wrapper(const char *key,
int unused_type,
void *context)
{
PCF_EVAL_CTX *cp = (PCF_EVAL_CTX *) context;
return (pcf_lookup_parameter_value(cp->mode, key, cp->local_scope,
(PCF_PARAM_NODE *) 0));
}
/* pcf_expand_parameter_value - expand $name in parameter value */
char *pcf_expand_parameter_value(VSTRING *buf, int mode, const char *value,
PCF_MASTER_ENT *local_scope)
{
const char *myname = "pcf_expand_parameter_value";
static VSTRING *local_buf;
int status;
PCF_EVAL_CTX eval_ctx;
/*
* Initialize.
*/
if (buf == 0) {
if (local_buf == 0)
local_buf = vstring_alloc(10);
buf = local_buf;
}
/*
* Expand macros recursively.
*
* When expanding $name in "postconf -n" parameter values, don't limit the
* search to only non-default parameter values.
*
* When expanding $name in "postconf -d" parameter values, do limit the
* search to only default parameter values.
*/
#define DONT_FILTER (char *) 0
eval_ctx.mode = (mode & ~PCF_SHOW_NONDEF);
eval_ctx.local_scope = local_scope;
status = mac_expand(buf, value, MAC_EXP_FLAG_RECURSE, DONT_FILTER,
pcf_lookup_parameter_value_wrapper, (void *) &eval_ctx);
if (status & MAC_PARSE_ERROR)
msg_fatal("macro processing error");
if (msg_verbose > 1) {
if (strcmp(value, STR(buf)) != 0)
msg_info("%s: expand %s -> %s", myname, value, STR(buf));
else
msg_info("%s: const %s", myname, value);
}
return (STR(buf));
}
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