TFTP ERROR (`tftp_error`)

Layer: Application and control
Header: variable length
Notes: Application protocols

Reached from

Lower layer	Selector	Value
`tftp`	`opcode`	5 (0x0005) (re-decodes this layer)

Fields

Field	Type	Default	Auto	Description
`opcode`	`enum(16)`	`5` (error)		TFTP opcode (1 = RRQ, 2 = WRQ, 3 = DATA, 4 = ACK, 5 = ERROR, 6 = OACK).
`error_code`	`enum(16)`	`1` (file_not_found)		TFTP error code (1 = file not found, 2 = access violation, …).
`message`	`cstring`	`"File not found"`		Error message (NUL-terminated).

`opcode`

Value	Name
1 (0x0001)	`rrq`
2 (0x0002)	`wrq`
3 (0x0003)	`data`
4 (0x0004)	`ack`
5 (0x0005)	`error`
6 (0x0006)	`oack`

`error_code`

Value	Name
0 (0x0000)	`not_defined`
1 (0x0001)	`file_not_found`
2 (0x0002)	`access_violation`
3 (0x0003)	`disk_full`
4 (0x0004)	`illegal_operation`
5 (0x0005)	`unknown_tid`
6 (0x0006)	`file_exists`
7 (0x0007)	`no_such_user`
8 (0x0008)	`option_negotiation`

Constraints

Level	Rule
warning	`opcode` = 5

Sample templates

tftp-error — templates/protocols/app/tftp-error.wpg.yaml