Don't log seqno failures in sptps_verify_datagram().

This function is not used for normal traffic, only when a packet from an
unknown source is received and we need to check against candidates. No
failures should be logger in this case; if the packet is really not
valid this will be logged by handle_incoming_vpn_data().

diff --git a/src/sptps.c b/src/sptps.c
index d6e6d41..7bd271b 100644 (file)
--- a/src/sptps.c
+++ b/src/sptps.c
@@ -1,6 +1,6 @@
 /*
     sptps.c -- Simple Peer-to-Peer Security
-    Copyright (C) 2011-2014 Guus Sliepen <guus@tinc-vpn.org>,
+    Copyright (C) 2011-2015 Guus Sliepen <guus@tinc-vpn.org>,
                   2010      Brandon L. Black <blblack@gmail.com>
 
     This program is free software; you can redistribute it and/or modify
@@ -384,10 +384,11 @@ static bool sptps_check_seqno(sptps_t *s, uint32_t seqno, bool update_state) {
                                if (update_state)
                                        s->farfuture++;
                                if(farfuture)
-                                       return error(s, EIO, "Packet is %d seqs in the future, dropped (%u)\n", seqno - s->inseqno, s->farfuture);
+                                       return update_state ? error(s, EIO, "Packet is %d seqs in the future, dropped (%u)\n", seqno - s->inseqno, s->farfuture) : false;
 
                                // Unless we have seen lots of them, in which case we consider the others lost.
-                               warning(s, "Lost %d packets\n", seqno - s->inseqno);
+                               if(update_state)
+                                       warning(s, "Lost %d packets\n", seqno - s->inseqno);
                                if (update_state) {
                                        // Mark all packets in the replay window as being late.
                                        memset(s->late, 255, s->replaywin);
@@ -395,7 +396,7 @@ static bool sptps_check_seqno(sptps_t *s, uint32_t seqno, bool update_state) {
                        } else if (seqno < s->inseqno) {
                                // If the sequence number is farther in the past than the bitmap goes, or if the packet was already received, drop it.
                                if((s->inseqno >= s->replaywin * 8 && seqno < s->inseqno - s->replaywin * 8) || !(s->late[(seqno / 8) % s->replaywin] & (1 << seqno % 8)))
-                                       return error(s, EIO, "Received late or replayed packet, seqno %d, last received %d\n", seqno, s->inseqno);
+                                       return update_state ? error(s, EIO, "Received late or replayed packet, seqno %d, last received %d\n", seqno, s->inseqno) : false;
                        } else if (update_state) {
                                // We missed some packets. Mark them in the bitmap as being late.
                                for(int i = s->inseqno; i < seqno; i++)