Added support for header verification.

src/lib-sieve/Makefile.am

@@ -63,6 +63,7 @@ libsieve_la_DEPENDENCIES = $(plugins)
 libsieve_la_LIBADD = $(plugins)
 
 libsieve_la_SOURCES = \
+	rfc2822.c \
 	sieve-limits.c \
 	sieve-message.c \
 	sieve-lexer.c \
@@ -95,6 +96,7 @@ libsieve_la_SOURCES = \
 	sieve.c 
 
 noinst_HEADERS = \
+	rfc2822.h \
 	sieve-config.h \
 	sieve-types.h \
 	sieve-common.h \

src/lib-sieve/rfc2822.c

+/* Copyright (c) 2002-2008 Dovecot Sieve authors, see the included COPYING file 
+ */
+
+#include "lib.h"
+
+#include "rfc2822.h"
+
+/* NOTE: much of the functionality implemented here should eventually appear
+ * somewhere in Dovecot itself.
+ */
+ 
+bool rfc2822_header_field_name_verify
+(const char *field_name, unsigned int len) 
+{
+	const char *p = field_name;
+	const char *pend = p + len;
+
+	/* field-name   =   1*ftext
+	 * ftext        =   %d33-57 /               ; Any character except
+   *                  %d59-126                ;  controls, SP, and
+   *                                          ;  ":".
+	 */
+	 
+	while ( p < pend ) {
+		if ( *p < 33 || *p == ':' )
+			return FALSE;
+	}	
+	
+	return TRUE;
+}
+

src/lib-sieve/rfc2822.h

+/* Copyright (c) 2002-2008 Dovecot Sieve authors, see the included COPYING file 
+ */
+
+#ifndef __RFC2822_H
+#define __RFC2822_H
+
+bool rfc2822_header_field_name_verify
+	(const char *field_name, unsigned int len);
+
+#endif /* __RFC2822_H */