tftp.h

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#ifndef TFTP_H
#define TFTP_H

#include <cfg/compiler.h>
#include <lwip/sockets.h> // sockaddr_in, socklen_t
#include <io/kfile.h>

#define TFTP_RRQ     0x0100     /* TFTP read request packet (already in net endianess). */
#define TFTP_WRQ     0x0200     /* TFTP write request packet (already in net endianess). */
#define TFTP_DATA    03         /* TFTP data packet. */
#define TFTP_ACK     0x0400     /* TFTP acknowledgement packet (already in net endianess). */
#define TFTP_PROTOERR     0x0500     /* TFTP acknowledgement packet (already in net endianess). */

/* TFTP protocol error codes */
#define TFTP_PROTOERR_ACCESS_VIOLATION 0x0200

#define TFTP_SERVER_PORT 69

/* Return error codes */
#define TFTP_ERR_TIMEOUT -2
#define TFTP_ERR         -1

struct PACKED TftpHeader
{
    short opcode;            
    union PACKED
    {
        short block;         /* block # */
        short code;          /* error code */
        char stuff[1];       /* request packet stuff */
    } th_u;
};

typedef struct PACKED Tftpframe {
    struct TftpHeader hdr;
    char data[512];          /* data or error string */
} Tftpframe;

struct PACKED ackframe
{
    short opcode;
    short block_num;
};

struct PACKED errframe
{
    short opcode;
    short errcode;
    char str;
};

typedef enum
{
    TFTP_READ,
    TFTP_WRITE,
} TftpOpenMode;

typedef struct TftpSession
{
    struct sockaddr_in addr;
    socklen_t addr_len;
    int sock;
    unsigned short block;
    mtime_t timeout;
    int error;
    Tftpframe frame;
    size_t bytes_available;
    size_t valid_data;
    bool is_xfer_end;
    bool pending_ack;
    KFile kfile_request;
} TftpSession;

int tftp_init(TftpSession *ctx, unsigned short port, mtime_t timeout);
KFile *tftp_listen(TftpSession *ctx, char *filename, size_t len, TftpOpenMode *mode);

#endif // TFTP_H