4e20d73bb5
will enable us to cascade async operations, which is necessary in order to properly support DNS. (For example, an HTTP request may have to redirect to a new location and will have to perform a new DNS lookup, so we can't just rely on doing the name lookup at the time of parsing the initial URL). Anything other than HTTP is probably broken right now; I'll fix the others up asap.
148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
#ifndef _GPXE_TFTP_H
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#define _GPXE_TFTP_H
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/** @file
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*
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* TFTP protocol
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*
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*/
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#include <stdint.h>
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#include <gpxe/udp.h>
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#include <gpxe/async.h>
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#include <gpxe/retry.h>
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#include <gpxe/buffer.h>
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#define TFTP_PORT 69 /**< Default TFTP server port */
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#define TFTP_DEFAULT_BLKSIZE 512 /**< Default TFTP data block size */
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#define TFTP_MAX_BLKSIZE 1432
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#define TFTP_RRQ 1 /**< Read request opcode */
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#define TFTP_WRQ 2 /**< Write request opcode */
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#define TFTP_DATA 3 /**< Data block opcode */
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#define TFTP_ACK 4 /**< Data block acknowledgement opcode */
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#define TFTP_ERROR 5 /**< Error opcode */
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#define TFTP_OACK 6 /**< Options acknowledgement opcode */
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#define TFTP_ERR_FILE_NOT_FOUND 1 /**< File not found */
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#define TFTP_ERR_ACCESS_DENIED 2 /**< Access violation */
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#define TFTP_ERR_DISK_FULL 3 /**< Disk full or allocation exceeded */
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#define TFTP_ERR_ILLEGAL_OP 4 /**< Illegal TFTP operation */
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#define TFTP_ERR_UNKNOWN_TID 5 /**< Unknown transfer ID */
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#define TFTP_ERR_FILE_EXISTS 6 /**< File already exists */
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#define TFTP_ERR_UNKNOWN_USER 7 /**< No such user */
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#define TFTP_ERR_BAD_OPTS 8 /**< Option negotiation failed */
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/** A TFTP read request (RRQ) packet */
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struct tftp_rrq {
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uint16_t opcode;
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char data[0];
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} __attribute__ (( packed ));
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/** A TFTP data (DATA) packet */
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struct tftp_data {
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uint16_t opcode;
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uint16_t block;
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uint8_t data[0];
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} __attribute__ (( packed ));
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/** A TFTP acknowledgement (ACK) packet */
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struct tftp_ack {
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uint16_t opcode;
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uint16_t block;
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} __attribute__ (( packed ));
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/** A TFTP error (ERROR) packet */
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struct tftp_error {
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uint16_t opcode;
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uint16_t errcode;
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char errmsg[0];
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} __attribute__ (( packed ));
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/** A TFTP options acknowledgement (OACK) packet */
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struct tftp_oack {
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uint16_t opcode;
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char data[0];
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} __attribute__ (( packed ));
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/** The common header of all TFTP packets */
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struct tftp_common {
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uint16_t opcode;
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} __attribute__ (( packed ));
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/** A union encapsulating all TFTP packet types */
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union tftp_any {
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struct tftp_common common;
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struct tftp_rrq rrq;
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struct tftp_data data;
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struct tftp_ack ack;
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struct tftp_error error;
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struct tftp_oack oack;
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};
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/**
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* A TFTP session
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*
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* This data structure holds the state for an ongoing TFTP transfer.
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*/
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struct tftp_session {
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/** UDP connection */
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struct udp_connection udp;
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/** Filename */
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const char *filename;
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/** Data buffer to fill */
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struct buffer *buffer;
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/** Requested data block size
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*
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* This is the "blksize" option requested from the TFTP
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* server. It may or may not be honoured.
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*/
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unsigned int request_blksize;
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/** Data block size
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*
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* This is the "blksize" option negotiated with the TFTP
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* server. (If the TFTP server does not support TFTP options,
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* this will default to 512).
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*/
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unsigned int blksize;
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/** File size
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*
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* This is the value returned in the "tsize" option from the
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* TFTP server. If the TFTP server does not support the
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* "tsize" option, this value will be zero.
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*/
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unsigned long tsize;
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/**
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* Transfer ID
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*
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* This is the transfer ID allocated by the server, used as
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* the server UDP port for all packets except the initial read
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* request.
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*/
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uint16_t tid;
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/** Session state
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*
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* This is the block number to be used in the next ACK sent
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* back to the server, i.e. the number of the last received
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* data block. The value zero indicates that the last
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* received block was an OACK (i.e. that the next ACK will
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* contain a block number of zero), and any value less than
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* zero indicates that the connection has not yet been opened
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* (i.e. that no blocks have yet been received).
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*/
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int state;
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/** Asynchronous operation for this session */
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struct async async;
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/** Retransmission timer */
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struct retry_timer timer;
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};
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/* Function prototypes */
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extern struct async_operation * tftp_get ( struct tftp_session *tftp );
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#endif /* _GPXE_TFTP_H */
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