Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 198 insertions, 0 deletions

diff --git a/src/postconf/postconf_lookup.c b/src/postconf/postconf_lookup.c
new file mode 100644
index 0000000..3cfa9f3
--- /dev/null
+++ b/src/postconf/postconf_lookup.c
@@ -0,0 +1,198 @@
+/*++
+/* 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));
+}