/usr/share/sendmail/cf/feature/conncontrol.m4 is in sendmail-cf 8.15.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2003, 2004 Proofpoint, Inc. and its suppliers.
# All rights reserved.
#
# By using this file, you agree to the terms and conditions set
# forth in the LICENSE file which can be found at the top level of
# the sendmail distribution.
#
#
divert(0)
VERSIONID(`$Id: conncontrol.m4,v 1.5 2013-11-22 20:51:11 ca Exp $')
divert(-1)
ifdef(`_ACCESS_TABLE_', `
define(`_CONN_CONTROL_', `1')
ifelse(defn(`_ARG_'), `', `',
strcasecmp(defn(`_ARG_'), `nodelay'), `1',
`ifdef(`_DELAY_CHECKS_',
`
define(`_CONN_CONTROL_IMMEDIATE_', `1')
define(`_CONTROL_IMMEDIATE_', `1')
',
`errprint(`*** ERROR: FEATURE(`conncontrol', `nodelay') requires FEATURE(`delay_checks')')'
)',
`errprint(`*** ERROR: unknown parameter '"defn(`_ARG_')"` for FEATURE(`conncontrol')')')
define(`_FFR_SRCHLIST_A', `1')
ifelse(len(X`'_ARG2_), `1', `',
_ARG2_, `terminate', `define(`_CONN_CONTROL_REPLY', `421')',
`errprint(`*** ERROR: FEATURE(`conncontrol'): unknown argument '"_ARG2_"
)'
)
', `errprint(`*** ERROR: FEATURE(`conncontrol') requires FEATURE(`access_db')
')')
ifdef(`_CONN_CONTROL_REPLY',,`define(`_CONN_CONTROL_REPLY', `452')')
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