From: Timo Sirainen <timo.sirainen@open-xchange.com>
Date: Sun, 19 Apr 2020 11:03:24 +0000 (+0300)
Subject: lib-mail: Add message_header_name_is_valid()
X-Git-Tag: 2.3.17~268
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ecac22474ae31e440e2f157373f0cc3947825a5f;p=thirdparty%2Fdovecot%2Fcore.git

lib-mail: Add message_header_name_is_valid()
---

diff --git a/src/lib-mail/message-header-parser.c b/src/lib-mail/message-header-parser.c
index f8f9974762..c45c63505e 100644
--- a/src/lib-mail/message-header-parser.c
+++ b/src/lib-mail/message-header-parser.c
@@ -434,3 +434,25 @@ message_header_strdup(pool_t pool, const unsigned char *data, size_t size)
 	}
 	return str_c(str);
 }
+
+bool message_header_name_is_valid(const char *name)
+{
+	/*
+	  field-name      =   1*ftext
+
+	  ftext           =   %d33-57 /          ; Printable US-ASCII
+			      %d59-126           ;  characters not including
+						 ;  ":".
+	*/
+	for (unsigned int i = 0; name[i] != '\0'; i++) {
+		unsigned char c = name[i];
+		if (c >= 33 && c <= 57) {
+			/* before ":" */
+		} else if (c >= 59 && c <= 126) {
+			/* after ":" */
+		} else {
+			return FALSE;
+		}
+	}
+	return TRUE;
+}
diff --git a/src/lib-mail/message-header-parser.h b/src/lib-mail/message-header-parser.h
index 4a3415470e..ce0825c8e5 100644
--- a/src/lib-mail/message-header-parser.h
+++ b/src/lib-mail/message-header-parser.h
@@ -79,4 +79,7 @@ void message_header_line_write(buffer_t *output,
 const char *
 message_header_strdup(pool_t pool, const unsigned char *data, size_t size);
 
+/* Returns TRUE if message header name is valid. */
+bool message_header_name_is_valid(const char *name);
+
 #endif