mirror of
https://github.com/romychs/ESPKit.git
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174 lines
3.6 KiB
NASM
174 lines
3.6 KiB
NASM
; ======================================================
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; TFTP-protocol support module for WTFTP app
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; By Roman Boykov. Copyright (c) 2024
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; https://github.com/romychs
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; License: BSD 3-Clause
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; ======================================================
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MODULE TFTP
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; ------------------------------------------------------
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; Operation codes 2b for tftp packet header (bytes swapped)
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; ------------------------------------------------------
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; Opcode Read Request
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OP_RRQ EQU '10'
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; Opcode Write Request
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OP_WRQ EQU '20'
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; Opcode Data packet
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OP_DATA EQU '30'
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; Opcode Acknowledge packet
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OP_ACK EQU '40'
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; Opcode Error packet
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OP_ERROR EQU '50'
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; ------------------------------------------------------
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; Build packet for request file from TFTF-server
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; Out: HL - pointer to buffer to send
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; ------------------------------------------------------
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BUILD_RRQ_PACKET
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PUSH DE
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LD DE,OP_RRQ ; opcode
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CALL BUILD_RW_PACKET
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POP DE
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RET
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; ------------------------------------------------------
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; Build packet for write file to TFTF-server
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; ------------------------------------------------------
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BUILD_WRQ_PACKET
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PUSH DE
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LD DE,OP_WRQ ; opcode
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CALL BUILD_RW_PACKET
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POP DE
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RET
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; ------------------------------------------------------
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; Build packet for write file or receive form TFTF-server
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; ------------------------------------------------------
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BUILD_RW_PACKET
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LD HL,TFTP_BUFF
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LD (HL), DE
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INC HL
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INC HL
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LD DE,MAIN.REM_FILE
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; filename
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.BRP_NXT_RF
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LD A, (DE)
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LD (HL), A
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OR A
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JR Z,.BRP_MOD
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INC HL
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INC DE
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JR .BRP_NXT_RF
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; Mode 'octet'Z
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.BRP_MOD
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INC HL
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LD DE,'co'
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LD (HL),DE
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INC HL
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INC HL
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LD DE,'et'
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LD (HL),DE
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INC HL
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INC HL
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LD D, 0 ; DE = "/0t"
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LD (HL),DE
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INC HL
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INC HL
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; Calculate packet length
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LD DE, TFTP_BUFF
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SBC HL,DE
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EX DE,HL
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LD HL,TFTF_PACKET_LEN
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LD (HL),DE
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RET
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; ------------------------------------------------------
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; Check TFTP Error, out error message if '05' packet
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; type received
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; Out: CF set if Error
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; A - packet type, second byte if no errors
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; ------------------------------------------------------
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CHK_ERROR
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LD HL,TFTP_BUFF
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LD A, (HL)
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CP '0'
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JR NZ, .CKE_UNKNOWN
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INC HL
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LD A, (HL)
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CP '5'
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JR Z, .CKE_ERR
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OR A
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RET
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.CKE_ERR
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INC HL
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LD DE,(HL) ; ErrorCode
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LD A, D
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OR E
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; check for 1..7 range for defined error codes
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JR Z,.CKE_UNDEF_ERR
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LD A,E
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CP 8
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JP P,.CKE_UNDEF_ERR
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; defined error
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ADD A
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LD E,A
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LD HL,.TFTPE_T
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ADD HL,DE
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LD A,(HL)
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INC HL
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LD H,(HL)
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LD L,A
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; print error message, HL - pointer to message
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.CKE_PRINT_ERR
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PUSH HL
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PRINT .MSG_TFTP_ERR ; Protocol error: ...
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POP HL
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PRINTLN_HL
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JR .CKE_ERR_EXIT
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; undefined error, message in datagram
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.CKE_UNDEF_ERR
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INC HL
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INC HL
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JR .CKE_PRINT_ERR
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.CKE_UNKNOWN
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; unknown packet type
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PRINTLN .MSG_ERR_UPT
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.CKE_ERR_EXIT
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SCF
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RET
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; ------------------------------------------------------
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; Defined TFTP Protocol Error messages
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; ------------------------------------------------------
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;MSG_TFTPE_0 DB "Not defined, see error message (if any).",0
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.MSG_TFTPE_1 DB "File not found.",0
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.MSG_TFTPE_2 DB "Access violation.",0
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.MSG_TFTPE_3 DB "Disk full or allocation exceeded.",0
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.MSG_TFTPE_4 DB "Illegal TFTP operation.",0
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.MSG_TFTPE_5 DB "Unknown transfer ID.",0
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.MSG_TFTPE_6 DB "File already exists.",0
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.MSG_TFTPE_7 DB "No such user.",0
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; Table with error messages offsets
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.TFTPE_T
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DW .MSG_TFTPE_1,.MSG_TFTPE_1,.MSG_TFTPE_2,.MSG_TFTPE_3
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DW .MSG_TFTPE_4,.MSG_TFTPE_5,.MSG_TFTPE_7,.MSG_TFTPE_7
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.MSG_TFTP_ERR
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DB "Protocol error: ",0
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.MSG_ERR_UPT
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DB "Unknown TFTP packet received!",0
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; Buffer for UDP datagram with TFTP payload
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TFTF_PACKET_LEN
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DW 0
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TFTP_BUFF
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DS 516,0
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ENDMODULE |