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 f8f99747620fa91553ac69af82a4d8d4cd69a658..c45c63505e2431073a93cebe9cfa7068a3e80e9d 100644 (file)
--- 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 4a3415470e4aca04c84d1644d0e926501b234b87..ce0825c8e57a5267c0a6f6b0b999a7bc59134616 100644 (file)
--- 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