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authorDenys Vlasenko <vda.linux@googlemail.com>2009-07-24 23:56:23 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2009-07-24 23:56:23 (GMT)
commitbac9f03ed85cb0a6887a8a7e9508e043edb792e8 (patch)
tree371bbeac46d88078636f33cbc8c50e094591063e
parent330d898e99f048bfe256c0123b29bdd77ea7b9b4 (diff)
downloadbusybox-bac9f03ed85cb0a6887a8a7e9508e043edb792e8.tar.gz
busybox-bac9f03ed85cb0a6887a8a7e9508e043edb792e8.tar.bz2
tftp: add comment, no code changes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--networking/tftp.c35
1 files changed, 30 insertions, 5 deletions
diff --git a/networking/tftp.c b/networking/tftp.c
index 5c50b8c..094c3ba 100644
--- a/networking/tftp.c
+++ b/networking/tftp.c
@@ -1,7 +1,5 @@
/* vi: set sw=4 ts=4: */
-/* -------------------------------------------------------------------------
- * tftp.c
- *
+/*
* A simple tftp client/server for busybox.
* Tries to follow RFC1350.
* Only "octet" mode supported.
@@ -19,8 +17,7 @@
* tftpd added by Denys Vlasenko & Vladimir Dronnikov
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
- * ------------------------------------------------------------------------- */
-
+ */
#include "libbb.h"
#if ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT
@@ -232,6 +229,34 @@ static int tftp_protocol(
#endif
}
+ /* Examples of network traffic.
+ * Note two cases when ACKs with block# of 0 are sent.
+ *
+ * Download without options:
+ * tftp -> "\0\1FILENAME\0octet\0"
+ * "\0\3\0\1FILEDATA..." <- tftpd
+ * tftp -> "\0\4\0\1"
+ * ...
+ * Download with option of blksize 16384:
+ * tftp -> "\0\1FILENAME\0octet\0blksize\00016384\0"
+ * "\0\6blksize\00016384\0" <- tftpd
+ * tftp -> "\0\4\0\0"
+ * "\0\3\0\1FILEDATA..." <- tftpd
+ * tftp -> "\0\4\0\1"
+ * ...
+ * Upload without options:
+ * tftp -> "\0\2FILENAME\0octet\0"
+ * "\0\4\0\0" <- tftpd
+ * tftp -> "\0\3\0\1FILEDATA..."
+ * "\0\4\0\1" <- tftpd
+ * ...
+ * Upload with option of blksize 16384:
+ * tftp -> "\0\2FILENAME\0octet\0blksize\00016384\0"
+ * "\0\6blksize\00016384\0" <- tftpd
+ * tftp -> "\0\3\0\1FILEDATA..."
+ * "\0\4\0\1" <- tftpd
+ * ...
+ */
block_nr = 1;
cp = xbuf + 2;