imap: Added verification of UIDVALIDITY mailbox attribute

Added support for checking the UIDVALIDITY, and aborting the request, if
it has been specified in the URL and the server response is different.

diff --git a/lib/imap.c b/lib/imap.c
index b7c92ef..9f0e6cb 100644 (file)
--- a/lib/imap.c
+++ b/lib/imap.c
@@ -1216,6 +1216,7 @@ static CURLcode imap_state_select_resp(struct connectdata *conn,
 {
   CURLcode result = CURLE_OK;
   struct SessionHandle *data = conn->data;
+  struct IMAP *imap = conn->data->state.proto.imap;
   struct imap_conn *imapc = &conn->proto.imapc;
   const char *line = data->state.buffer;
   char tmp[20];
@@ -1233,8 +1234,16 @@ static CURLcode imap_state_select_resp(struct connectdata *conn,
     failf(data, "Select failed");
     result = CURLE_LOGIN_DENIED;
   }
-  else
-    result = imap_fetch(conn);
+  else {
+    /* Check if the UIDVALIDITY has been specified and matches */
+    if(imap->uidvalidity && imapc->mailbox_uidvalidity &&
+       strcmp(imap->uidvalidity, imapc->mailbox_uidvalidity)) {
+      failf(conn->data, "Mailbox UIDVALIDITY has changed");
+      result = CURLE_REMOTE_FILE_NOT_FOUND;
+    }
+    else
+      result = imap_fetch(conn);
+  }
 
   return result;
 }