1 files changed, 82 insertions, 0 deletions
diff --git a/src/util/cidr_match.h b/src/util/cidr_match.h
new file mode 100644
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--- /dev/null
+++ b/src/util/cidr_match.h
@@ -0,0 +1,82 @@
+#ifndef _CIDR_MATCH_H_INCLUDED_
+#define _CIDR_MATCH_H_INCLUDED_
+
+/*++
+/* NAME
+/*	dict_cidr 3h
+/* SUMMARY
+/*	CIDR-style pattern matching
+/* SYNOPSIS
+/*	#include <cidr_match.h>
+/* DESCRIPTION
+/* .nf
+
+ /*
+  * System library.
+  */
+#include <limits.h>			/* CHAR_BIT */
+
+ /*
+  * Utility library.
+  */
+#include <myaddrinfo.h>			/* MAI_V6ADDR_BYTES etc. */
+#include <vstring.h>
+
+ /*
+  * External interface.
+  * 
+  * Address length is protocol dependent. Find out how large our address byte
+  * strings should be.
+  */
+#ifdef HAS_IPV6
+# define CIDR_MATCH_ABYTES	MAI_V6ADDR_BYTES
+#else
+# define CIDR_MATCH_ABYTES	MAI_V4ADDR_BYTES
+#endif
+
+ /*
+  * Each parsed CIDR pattern can be member of a linked list.
+  */
+typedef struct CIDR_MATCH {
+    int     op;				/* operation, match or control flow */
+    int     match;			/* positive or negative match */
+    unsigned char net_bytes[CIDR_MATCH_ABYTES];	/* network portion */
+    unsigned char mask_bytes[CIDR_MATCH_ABYTES];	/* network mask */
+    unsigned char addr_family;		/* AF_XXX */
+    unsigned char addr_byte_count;	/* typically, 4 or 16 */
+    unsigned char addr_bit_count;	/* optimization */
+    unsigned char mask_shift;		/* optimization */
+    struct CIDR_MATCH *next;		/* next entry */
+    struct CIDR_MATCH *block_end;	/* block terminator */
+} CIDR_MATCH;
+
+#define CIDR_MATCH_OP_MATCH	1	/* Match this pattern */
+#define CIDR_MATCH_OP_IF	2	/* Increase if/endif nesting on match */
+#define CIDR_MATCH_OP_ENDIF	3	/* Decrease if/endif nesting on match */
+
+#define CIDR_MATCH_TRUE		1	/* Request positive match */
+#define CIDR_MATCH_FALSE	0	/* Request negative match */
+
+extern VSTRING *cidr_match_parse(CIDR_MATCH *, char *, int, VSTRING *);
+extern VSTRING *cidr_match_parse_if(CIDR_MATCH *, char *, int, VSTRING *);
+extern void cidr_match_endif(CIDR_MATCH *);
+
+extern CIDR_MATCH *cidr_match_execute(CIDR_MATCH *, const char *);
+
+/* 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
+/*--*/
+
+#endif