Module ftp 

FTP (File Transfer Protocol) layer implementation.

Implements RFC 959 FTP packet parsing as a zero-copy view into a packet buffer.

FTP operates over two TCP connections:

• Control connection (port 21): Commands and replies (text-based)
• Data connection (port 20 or negotiated): Actual file data

This implementation focuses on the control connection protocol.

Packet Format

Client Command:

COMMAND [arguments]\r\n

Server Reply:

NNN<SP>text\r\n               (single-line)
NNN-text\r\n ... NNN<SP>text\r\n  (multi-line)

Where NNN is a 3-digit reply code.

Reply Code Categories

Range	Meaning
1xx	Positive Preliminary
2xx	Positive Completion
3xx	Positive Intermediate
4xx	Transient Negative
5xx	Permanent Negative

Re-exports

pub use builder::FtpBuilder;

Modules

builder

FTP packet builder.

Structs

FtpLayer

A zero-copy view into an FTP layer within a packet buffer.

Enums

FtpMessageKind

Represents an FTP message type.

Constants

CMD_ABOR

CMD_ACCT

CMD_ALLO

CMD_APPE

CMD_AUTH

CMD_CDUP

CMD_CWD

CMD_DELE

CMD_EPRT

CMD_EPSV

CMD_FEAT

CMD_HELP

CMD_LIST

CMD_MDTM

CMD_MKD

CMD_MLSD

CMD_MLST

CMD_MODE

CMD_NLST

CMD_NOOP

CMD_OPTS

CMD_PASS

CMD_PASV

CMD_PBSZ

CMD_PORT

CMD_PROT

CMD_PWD

CMD_QUIT

CMD_REIN

CMD_REST

CMD_RETR

CMD_RMD

CMD_RNFR

CMD_RNTO

CMD_SITE

CMD_SIZE

CMD_SMNT

CMD_STAT

CMD_STOR

CMD_STOU

CMD_STRU

CMD_SYST

CMD_TYPE

CMD_USER

FTP_CONTROL_PORT

FTP control port.

FTP_DATA_PORT

FTP data port.

FTP_MIN_HEADER_LEN

Minimum FTP payload: at least “OK\r\n” or short command.

REPLY_ARG_SYNTAX_ERROR

REPLY_AUTH_OK

REPLY_BAD_SEQUENCE

REPLY_CANT_OPEN_DATA

REPLY_CLOSING_CONTROL

REPLY_CLOSING_DATA

REPLY_CMD_NOT_IMPL

REPLY_CMD_NOT_IMPL_PARAM

REPLY_COMMAND_NOT_IMPLEMENTED

REPLY_CONN_CLOSED

REPLY_DATA_OPEN

REPLY_DATA_OPEN_XFER

REPLY_DIR_STATUS

REPLY_EXCEED_STORAGE

REPLY_EXTENDED_PASSIVE

REPLY_FILENAME_NOT_ALLOWED

REPLY_FILE_ACTION_OK

REPLY_FILE_STATUS

REPLY_FILE_STATUS_OK

REPLY_FILE_UNAVAIL

REPLY_FILE_UNAVAIL_BUSY

REPLY_HELP_MSG

REPLY_HOST_UNAVAIL

REPLY_INSUFF_STORAGE

REPLY_INVALID_CRED

REPLY_LOCAL_ERROR

REPLY_LONG_PASSIVE

REPLY_NAME_SYSTEM

REPLY_NEED_ACCOUNT

REPLY_NEED_ACCOUNT_FOR_STOR

REPLY_NOT_LOGGED_IN

REPLY_OK

REPLY_PAGE_TYPE_UNKNOWN

REPLY_PASSIVE

REPLY_PATHNAME_CREATED

REPLY_PENDING_INFO

REPLY_RESTART_MARKER

REPLY_SERVICE_NOT_AVAIL

REPLY_SERVICE_READY

REPLY_SERVICE_READY_IN

REPLY_SYNTAX_ERROR

REPLY_SYSTEM_STATUS

REPLY_USER_LOGGED_IN

REPLY_USER_OK_NEED_PASS

Statics

FTP_COMMANDS

FTP command verbs for detection.

FTP_FIELD_NAMES

Field names for Python/generic access.

Functions

ftp_show_fields

Display fields for FtpLayer in show() output.

is_ftp_payload

Returns true if buf looks like an FTP control-connection payload.

reply_code_description

Returns a human-readable description for an FTP reply code.