From b7c15c31519dc44c1f691e0466badd556ffe9423 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 18:18:56 +0200
Subject: Adding upstream version 3.7.10.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/postscreen/postscreen_expand.c | 141 +++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 src/postscreen/postscreen_expand.c

(limited to 'src/postscreen/postscreen_expand.c')

diff --git a/src/postscreen/postscreen_expand.c b/src/postscreen/postscreen_expand.c
new file mode 100644
index 0000000..ecda543
--- /dev/null
+++ b/src/postscreen/postscreen_expand.c
@@ -0,0 +1,141 @@
+/*++
+/* NAME
+/*	postscreen_expand 3
+/* SUMMARY
+/*	SMTP server macro expansion
+/* SYNOPSIS
+/*	#include <postscreen.h>
+/*
+/*	void	psc_expand_init()
+/*
+/*	VSTRING *psc_expand_filter;
+/*
+/*	const char *psc_expand_lookup(name, unused_mode, context)
+/*	const char *name;
+/*	int	unused_mode;
+/*	char	*context;
+/* DESCRIPTION
+/*	This module expands session-related macros.
+/*
+/*	psc_expand_init() performs one-time initialization
+/*	of the psc_expand_filter buffer.
+/*
+/*	The psc_expand_filter buffer contains the characters
+/*	that are allowed in macro expansion, as specified with the
+/*	psc_expand_filter configuration parameter.
+/*
+/*	psc_expand_lookup() returns the value of the named
+/*	macro or a null pointer.
+/*
+/*	Arguments:
+/* .IP name
+/*	Macro name.
+/* .IP context
+/*	Call-back context (a PSC_STATE pointer).
+/* DIAGNOSTICS
+/*	Panic: interface violations. Fatal errors: out of memory.
+/*	internal protocol errors. postscreen_expand() returns the
+/*	binary OR of MAC_PARSE_ERROR (syntax error) and MAC_PARSE_UNDEF
+/*	(undefined macro name).
+/* 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
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <time.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <vstring.h>
+#include <stringops.h>
+
+/* Global library. */
+
+#include <mail_params.h>
+#include <mail_proto.h>
+
+/* Application-specific. */
+
+#include <postscreen.h>
+
+ /*
+  * Pre-parsed expansion filter.
+  */
+VSTRING *psc_expand_filter;
+
+/* psc_expand_init - initialize once during process lifetime */
+
+void    psc_expand_init(void)
+{
+
+    /*
+     * Expand the expansion filter :-)
+     */
+    psc_expand_filter = vstring_alloc(10);
+    unescape(psc_expand_filter, var_psc_exp_filter);
+}
+
+/* psc_expand_lookup - generic SMTP attribute $name expansion */
+
+const char *psc_expand_lookup(const char *name, int unused_mode,
+			              void *context)
+{
+    PSC_STATE *state = (PSC_STATE *) context;
+    time_t  now;
+    struct tm *lt;
+
+    if (state->expand_buf == 0)
+	state->expand_buf = vstring_alloc(10);
+
+    if (msg_verbose > 1)
+	msg_info("psc_expand_lookup: ${%s}", name);
+
+#define STREQ(x,y)    (*(x) == *(y) && strcmp((x), (y)) == 0)
+#define STREQN(x,y,n) (*(x) == *(y) && strncmp((x), (y), (n)) == 0)
+#define CONST_LEN(x)  (sizeof(x) - 1)
+
+    /*
+     * Don't query main.cf parameters, as the result of expansion could
+     * reveal system-internal information in server replies.
+     * 
+     * XXX: This said, multiple servers may be behind a single client-visible
+     * name or IP address, and each may generate its own logs. Therefore, it
+     * may be useful to expose the replying MTA id (myhostname) in the
+     * contact footer, to identify the right logs. So while we don't expose
+     * the raw configuration dictionary, we do expose "$myhostname" as
+     * expanded in var_myhostname.
+     * 
+     * Return NULL only for non-existent names.
+     */
+    if (STREQ(name, MAIL_ATTR_SERVER_NAME)) {
+	return (var_myhostname);
+    } else if (STREQ(name, MAIL_ATTR_ACT_CLIENT_ADDR)) {
+	return (state->smtp_client_addr);
+    } else if (STREQ(name, MAIL_ATTR_ACT_CLIENT_PORT)) {
+	return (state->smtp_client_port);
+    } if (STREQ(name, MAIL_ATTR_LOCALTIME)) {
+	if (time(&now) == (time_t) -1)
+	    msg_fatal("time lookup failed: %m");
+	lt = localtime(&now);
+	VSTRING_RESET(state->expand_buf);
+	do {
+	    VSTRING_SPACE(state->expand_buf, 100);
+	} while (strftime(STR(state->expand_buf),
+			  vstring_avail(state->expand_buf),
+			  "%b %d %H:%M:%S", lt) == 0);
+	return (STR(state->expand_buf));
+    } else {
+	msg_warn("unknown macro name \"%s\" in expansion request", name);
+	return (0);
+    }
+}
-- 
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