Warn about TFTP block rollover

diff --git a/tftp.c b/tftp.c
index 06258dc4259e6967e6cf0fae71000b2a44e729cf..27ca32062ec92fd54c330665793991a8aa74ae25 100644 (file)
--- a/tftp.c
+++ b/tftp.c
@@ -314,6 +314,7 @@ int tftp_put(struct nmrpd_args *args)
        char rx[2048], tx[2048];
        const char *file_remote = args->file_remote;
        char *val, *end;
+       bool rollover;
 
        sock = -1;
        ret = -1;
@@ -373,6 +374,7 @@ int tftp_put(struct nmrpd_args *args)
        last_len = -1;
        len = 0;
        errors = 0;
+       rollover = false;
        /* Not really, but this way the loop sends our WRQ before receiving */
        timeouts = 1;
 
@@ -394,6 +396,10 @@ int tftp_put(struct nmrpd_args *args)
                                                ret = -1;
                                                goto cleanup;
                                        }
+
+                                       if (verbosity) {
+                                               printf("Remote accepted blksize option: %d b\n", blksize);
+                                       }
                                }
                        }
                }
@@ -401,8 +407,10 @@ int tftp_put(struct nmrpd_args *args)
                if (timeouts || ackblock == block) {
                        if (!timeouts) {
                                if (++block == 0) {
-                                       // rollover; skip to block 1
-                                       block = 1;
+                                       if (!rollover) {
+                                               printf("Warning: TFTP block rollover. Upload might fail!\n");
+                                               rollover = true;
+                                       }
                                }
 
                                pkt_mknum(tx, DATA);