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# Copyright 2011 Chris Siebenmann
# Copyright 2024 Paul Arthur MacIain
# GNU General Public License v3.0 (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
# Constants for the milter protocol.
# fmt: off
MILTER_VERSION = 6 # Milter version we claim to speak
MILTER_CHUNK_SIZE = 65535 # How large an SMFIC_BODY body can be
# Address families
SMFIA_UNKNOWN = 'U'
SMFIA_UNIX = 'L'
SMFIA_INET = '4'
SMFIA_INET6 = '6'
# Commands
SMFIC_ABORT = 'A'
SMFIC_BODY = 'B' # body chunk
SMFIC_CONNECT = 'C' # connection information
SMFIC_MACRO = 'D' # define macro
SMFIC_BODYEOB = 'E' # final body chunk
SMFIC_HELO = 'H' # HELO or EHLO
SMFIC_QUIT_NC = 'K' # QUIT but new connection follows
SMFIC_HEADER = 'L'
SMFIC_MAIL = 'M' # MAIL FROM
SMFIC_EOH = 'N'
SMFIC_OPTNEG = 'O' # option negotiation
SMFIC_QUIT = 'Q'
SMFIC_RCPT = 'R' # RCPT TO
SMFIC_DATA = 'T'
# What the filter might do
SMFIF_ADDHDRS = 0x0001 # add headers
SMFIF_CHGBODY = 0x0002 # replace body
SMFIF_ADDRCPT = 0x0004 # add recipients
SMFIF_DELRCPT = 0x0008 # delete recipientes
SMFIF_CHGHDRS = 0x0010 # change and delete headers
SMFIF_QUARANTINE = 0x0020
SMFIF_CHGFROM = 0x0040 # change envelope sender
SMFIF_ADDRCPT_PAR = 0x0080 # add recipients including arguments
SMFIF_SETSYMLIST = 0x0100 # send set of symbols that it wants
# Macro places
SMFIM_CONNECT = 0 # connect
SMFIM_HELO = 1 # HELO/EHLO
SMFIM_ENVFROM = 2 # MAIL FROM
SMFIM_ENVRCPT = 3 # RCPT TO
SMFIM_DATA = 4 # DATA
SMFIM_EOM = 5 # end of message
SMFIM_EOH = 6 # end of header
# bitmask of actions supported in each protocol version
SMFI_V1_ACTS = 0x000f
SMFI_V2_ACTS = 0x003f
SMFI_V6_ACTS = 0x01ff
# protocol negotiation
SMFIP_NOCONNECT = 0x00000001 # MTA should not send connection info
SMFIP_NOHELO = 0x00000002 # MTA should not send hello
SMFIP_NOMAIL = 0x00000004 # MTA should not send MAIL
SMFIP_NORCPT = 0x00000008 # MTA should not send RCPT
SMFIP_NOBODY = 0x00000010 # MTA should not send body
SMFIP_NOHDRS = 0x00000020 # MTA should not send headers
SMFIP_NOEOH = 0x00000040 # MTA should not send EOH
SMFIP_NR_HDR = 0x00000080 # No reply for headers
SMFIP_NOUNKNOWN = 0x00000100 # MTA should not send unknown commands
SMFIP_NODATA = 0x00000200 # MTA should not send DATA
SMFIP_SKIP = 0x00000400 # MTA understands SMFIS_SKIP
SMFIP_RCPT_REJ = 0x00000800 # MTA should also send rejected RCPTs
SMFIP_NR_CONN = 0x00001000 # No reply for connect
SMFIP_NR_HELO = 0x00002000 # No reply for HELO
SMFIP_NR_MAIL = 0x00004000 # No reply for MAIL
SMFIP_NR_RCPT = 0x00008000 # No reply for RCPT
SMFIP_NR_DATA = 0x00010000 # No reply for DATA
SMFIP_NR_UNKN = 0x00020000 # No reply for UNKN
SMFIP_NR_EOH = 0x00040000 # No reply for eoh
SMFIP_NR_BODY = 0x00080000 # No reply for body chunk
SMFIP_HDR_LEADSPC = 0x00100000 # header value leading space
SMFIP_MDS_256K = 0x10000000 # MILTER_MAX_DATA_SIZE=256K
SMFIP_MDS_1M = 0x20000000 # MILTER_MAX_DATA_SIZE=1M
# bitmask of protocol steps supported in each version
SMFI_V1_PROT = 0x00003f
SMFI_V2_PROT = 0x00007f
SMFI_V6_PROT = 0x1fffff
# Acceptable response commands/codes to return to sendmail (with accompanying
# command data).
SMFIR_ADDRCPT = '+' # Add recipient
SMFIR_DELRCPT = '-' # Delete recipient
SMFIR_ADDRCPT_PAR = '2' # Add recipient (including ESMTP args)
SMFIR_SHUTDOWN = '4' # 421: shutdown (internal to MTA)
SMFIR_ACCEPT = 'a' # Accept
SMFIR_REPLBODY = 'b' # Replace body (chunk)
SMFIR_CONTINUE = 'c' # Continue
SMFIR_DISCARD = 'd' # Discard
SMFIR_CHGFROM = 'e' # Change envelope sender (from)
SMFIR_CONN_FAIL = 'f' # Cause a connection failure
SMFIR_ADDHEADER = 'h' # Add header
SMFIR_INSHEADER = 'i' # Insert header
SMFIR_SETSYMLIST = 'l' # Set list of symbols (macros)
SMFIR_CHGHEADER = 'm' # Change header
SMFIR_PROGRESS = 'p' # Progress
SMFIR_QUARANTINE = 'q' # Quarantine
SMFIR_REJECT = 'r' # Reject
SMFIR_SKIP = 's' # Skip
SMFIR_TEMPFAIL = 't' # Tempfail
SMFIR_REPLYCODE = 'y' # Reply code
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