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tftp: add comment, no code changes

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-07-25 01:56:23 +02:00
parent 330d898e99
commit bac9f03ed8
1 changed files with 30 additions and 5 deletions
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35
networking/tftp.c
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@ -1,7 +1,5 @@
/* vi: set sw=4 ts=4: */ /* vi: set sw=4 ts=4: */
/* ------------------------------------------------------------------------- /*
* tftp.c
*
* A simple tftp client/server for busybox. * A simple tftp client/server for busybox.
* Tries to follow RFC1350. * Tries to follow RFC1350.
* Only "octet" mode supported. * Only "octet" mode supported.
@ -19,8 +17,7 @@
* tftpd added by Denys Vlasenko & Vladimir Dronnikov * tftpd added by Denys Vlasenko & Vladimir Dronnikov
* *
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
* ------------------------------------------------------------------------- */ */
#include "libbb.h" #include "libbb.h"
#if ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT #if ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT
@ -232,6 +229,34 @@ static int tftp_protocol(
#endif #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; block_nr = 1;
cp = xbuf + 2; cp = xbuf + 2;