Gecko [ www.thearyasamaj.org ]

Name	Size	Permission
NetworkManager	3.41 MB	-rwxr-xr-x
a3mnt	832 B	-rwxr-xr-x
aakore	481 B	-rwxr-xr-x
accessdb	12.59 KB	-rwxr-xr-x
accton	13.69 KB	-rwxr-xr-x
acp-update-controller	820 B	-rwxr-xr-x
acrocmd	822 B	-rwxr-xr-x
acronis_encrypt	818 B	-rwxr-xr-x
acronis_mms	1.29 KB	-rwxr-xr-x
acronis_schedinfo	435 B	-rwxr-xr-x
acronis_schedule	818 B	-rwxr-xr-x
acropsh	804 B	-rwxr-xr-x
adcli	171.08 KB	-rwxr-xr-x
addgnupghome	3 KB	-rwxr-xr-x
addpart	24.85 KB	-rwxr-xr-x
adduser	148.13 KB	-rwxr-xr-x
agetty	62.38 KB	-rwxr-xr-x
alternatives	36.62 KB	-rwxr-xr-x
anacron	40.98 KB	-rwxr-xr-x
apachectl	4.19 KB	-rwxr-xr-x
applygnupgdefaults	2.17 KB	-rwxr-xr-x
arp	64.71 KB	-rwxr-xr-x
arpd	87.1 KB	-rwxr-xr-x
arping	28.74 KB	-rwxr-xr-x
atd	32.63 KB	-rwxr-xr-x
atrun	67 B	-rwxr-xr-x
auditctl	45.04 KB	-rwxr-xr-x
auditd	155.78 KB	-rwxr-xr-x
augenrules	3.7 KB	-rwxr-xr-x
aureport	122.34 KB	-rwxr-xr-x
ausearch	130.37 KB	-rwxr-xr-x
autrace	16.53 KB	-rwxr-x---
avcstat	16.39 KB	-rwxr-xr-x
badblocks	32.57 KB	-rwxr-xr-x
biosdecode	25.45 KB	-rwxr-xr-x
biosdevname	46.16 KB	-rwxr-xr-x
blkdeactivate	15.97 KB	-r-xr-xr-x
blkdiscard	29.05 KB	-rwxr-xr-x
blkid	98.66 KB	-rwxr-xr-x
blkzone	49.73 KB	-rwxr-xr-x
blockdev	41.3 KB	-rwxr-xr-x
bpftool	2.77 MB	-rwxr-xr-x
bridge	150.15 KB	-rwxr-xr-x
build-locale-archive	812.27 KB	-rwx------
cache_check	1.43 MB	-rwxr-xr-x
cache_dump	1.43 MB	-rwxr-xr-x
cache_metadata_size	1.43 MB	-rwxr-xr-x
cache_repair	1.43 MB	-rwxr-xr-x
cache_restore	1.43 MB	-rwxr-xr-x
cache_writeback	1.43 MB	-rwxr-xr-x
capsh	32.44 KB	-rwxr-xr-x
cfdisk	98.39 KB	-rwxr-xr-x
chcpu	28.82 KB	-rwxr-xr-x
chgpasswd	69.67 KB	-rwxr-xr-x
chkconfig	45.16 KB	-rwxr-xr-x
chpasswd	61.42 KB	-rwxr-xr-x
chronyd	351.16 KB	-rwxr-xr-x
chroot	41.44 KB	-rwxr-xr-x
clock	65.26 KB	-rwxr-xr-x
clockdiff	20.42 KB	-rwxr-xr-x
consoletype	11.85 KB	-rwxr-xr-x
convertquota	78.68 KB	-rwxr-xr-x
cracklib-check	13.05 KB	-rwxr-xr-x
cracklib-format	251 B	-rwxr-xr-x
cracklib-packer	13.05 KB	-rwxr-xr-x
cracklib-unpacker	9.03 KB	-rwxr-xr-x
create-cracklib-dict	990 B	-rwxr-xr-x
crond	73.94 KB	-rwxr-xr-x
cryptsetup	143.43 KB	-rwxr-xr-x
csf	245.08 KB	-rwx------
ctrlaltdel	20.77 KB	-rwxr-xr-x
ctstat	25.32 KB	-rwxr-xr-x
dcb	146.85 KB	-rwxr-xr-x
ddns-confgen	20.45 KB	-rwxr-xr-x
debugfs	231.63 KB	-rwxr-xr-x
delpart	24.85 KB	-rwxr-xr-x
depmod	159.46 KB	-rwxr-xr-x
devlink	185.22 KB	-rwxr-xr-x
dhclient	453.64 KB	-rwxr-xr-x
dhclient-script	32.86 KB	-rwxr-xr-x
dkms	117.1 KB	-rwxr-xr-x
dmeventd	45.02 KB	-r-xr-xr-x
dmfilemapd	24.53 KB	-r-xr-xr-x
dmidecode	125.68 KB	-rwxr-xr-x
dmsetup	158.63 KB	-r-xr-xr-x
dmstats	158.63 KB	-r-xr-xr-x
dnssec-checkds	936 B	-rwxr-xr-x
dnssec-coverage	938 B	-rwxr-xr-x
dnssec-dsfromkey	60.84 KB	-rwxr-xr-x
dnssec-importkey	60.83 KB	-rwxr-xr-x
dnssec-keyfromlabel	64.74 KB	-rwxr-xr-x
dnssec-keygen	72.83 KB	-rwxr-xr-x
dnssec-keymgr	934 B	-rwxr-xr-x
dnssec-revoke	56.73 KB	-rwxr-xr-x
dnssec-settime	60.83 KB	-rwxr-xr-x
dnssec-signzone	117.19 KB	-rwxr-xr-x
dnssec-verify	52.84 KB	-rwxr-xr-x
dosfsck	65.13 KB	-rwxr-xr-x
dosfslabel	61.1 KB	-rwxr-xr-x
dovecot	93.86 KB	-rwxr-xr-x
dump-acct	29.15 KB	-rwxr-xr-x
dump-utmp	25.02 KB	-rwxr-xr-x
dumpe2fs	32.51 KB	-rwxr-xr-x
e2freefrag	16.41 KB	-rwxr-xr-x
e2fsck	328.51 KB	-rwxr-xr-x
e2image	36.59 KB	-rwxr-xr-x
e2label	110.63 KB	-rwxr-xr-x
e2mmpstatus	32.51 KB	-rwxr-xr-x
e2undo	20.37 KB	-rwxr-xr-x
e4crypt	24.54 KB	-rwxr-xr-x
e4defrag	28.48 KB	-rwxr-xr-x
ebtables	216.6 KB	-rwxr-xr-x
ebtables-restore	216.6 KB	-rwxr-xr-x
ebtables-save	216.6 KB	-rwxr-xr-x
edquota	91.24 KB	-rwxr-xr-x
era_check	1.43 MB	-rwxr-xr-x
era_dump	1.43 MB	-rwxr-xr-x
era_invalidate	1.43 MB	-rwxr-xr-x
era_restore	1.43 MB	-rwxr-xr-x
ether-wake	73.99 KB	-rwxr-xr-x
ethtool	557.79 KB	-rwxr-xr-x
faillock	20.52 KB	-rwxr-xr-x
fatlabel	61.1 KB	-rwxr-xr-x
fcgistarter	12.48 KB	-rwxr-xr-x
fdformat	33.16 KB	-rwxr-xr-x
fdisk	130.9 KB	-rwxr-xr-x
filefrag	16.45 KB	-rwxr-xr-x
findfs	12.36 KB	-rwxr-xr-x
firewalld	6.92 KB	-rwxr-xr-x
fix-info-dir	7.84 KB	-rwxr-xr-x
fixfiles	10.48 KB	-rwxr-xr-x
fsadm	24 KB	-r-xr-xr-x
fsck	53.47 KB	-rwxr-xr-x
fsck.cramfs	41.41 KB	-rwxr-xr-x
fsck.ext2	328.51 KB	-rwxr-xr-x
fsck.ext3	328.51 KB	-rwxr-xr-x
fsck.ext4	328.51 KB	-rwxr-xr-x
fsck.fat	65.13 KB	-rwxr-xr-x
fsck.minix	98.73 KB	-rwxr-xr-x
fsck.msdos	65.13 KB	-rwxr-xr-x
fsck.vfat	65.13 KB	-rwxr-xr-x
fsck.xfs	1.92 KB	-rwxr-xr-x
fsfreeze	16.38 KB	-rwxr-xr-x
fstrim	45.61 KB	-rwxr-xr-x
ftpscrub	17.87 KB	-rwxr-xr-x
ftpshut	12.36 KB	-rwxr-xr-x
fuse2fs	70.38 KB	-rwxr-xr-x
fuser	38.14 KB	-rwxr-xr-x
g13-syshelp	189.71 KB	-rwxr-xr-x
genhomedircon	29.27 KB	-rwxr-xr-x
genhostid	11.85 KB	-rwxr-xr-x
genl	94.95 KB	-rwxr-xr-x
genrandom	12.37 KB	-rwxr-xr-x
getcap	12.34 KB	-rwxr-xr-x
getenforce	7.83 KB	-rwxr-xr-x
getpcaps	12.27 KB	-rwxr-xr-x
getsebool	11.86 KB	-rwxr-xr-x
groupadd	95.34 KB	-rwxr-xr-x
groupdel	91.09 KB	-rwxr-xr-x
groupmems	61.48 KB	-rwxr-xr-x
groupmod	99.37 KB	-rwxr-xr-x
grpck	61.48 KB	-rwxr-xr-x
grpconv	57.26 KB	-rwxr-xr-x
grpunconv	57.24 KB	-rwxr-xr-x
grub2-bios-setup	1.14 MB	-rwxr-xr-x
grub2-get-kernel-settings	2.34 KB	-rwxr-xr-x
grub2-install	1.43 MB	-rwxr-xr-x
grub2-macbless	1.12 MB	-rwxr-xr-x
grub2-mkconfig	8.68 KB	-rwxr-xr-x
grub2-ofpathname	242.19 KB	-rwxr-xr-x
grub2-probe	1.14 MB	-rwxr-xr-x
grub2-reboot	3.99 KB	-rwxr-xr-x
grub2-rpm-sort	279.02 KB	-rwxr-xr-x
grub2-set-bootflag	11.87 KB	-rwsr-xr-x
grub2-set-default	3.45 KB	-rwxr-xr-x
grub2-set-password	3.05 KB	-rwxr-xr-x
grub2-setpassword	3.05 KB	-rwxr-xr-x
grub2-sparc64-setup	1.14 MB	-rwxr-xr-x
grub2-switch-to-blscfg	8.6 KB	-rwxr-xr-x
grubby	260 B	-rwxr-xr-x
gss-server	24.59 KB	-rwxr-xr-x
halt	218.45 KB	-rwxr-xr-x
hardlink	17.09 KB	-rwxr-xr-x
hdparm	131.91 KB	-rwxr-xr-x
htcacheclean	32.63 KB	-rwxr-xr-x
httpd	570.3 KB	-rwxr-xr-x
hwclock	65.26 KB	-rwxr-xr-x
iconvconfig	33.04 KB	-rwxr-xr-x
ifconfig	80.86 KB	-rwxr-xr-x
ifdown	1.07 KB	-rwxr-xr-x
ifenslave	24.94 KB	-rwxr-xr-x
ifstat	91.22 KB	-rwxr-xr-x
iftop	75.42 KB	-rwxr-xr-x
ifup	1.04 KB	-rwxr-xr-x
in.proftpd	1.17 MB	-rwxr-xr-x
init	1.53 MB	-rwxr-xr-x
insmod	159.46 KB	-rwxr-xr-x
install-info	50.23 KB	-rwxr-xr-x
installkernel	323 B	-rwxr-xr-x
intel_sdsi	15.61 KB	-rwxr-xr-x
iotop	511 B	-rwxr-xr-x
ip	664.43 KB	-rwxr-xr-x
ip6tables	216.6 KB	-rwxr-xr-x
ip6tables-restore	216.6 KB	-rwxr-xr-x
ip6tables-restore-translate	216.6 KB	-rwxr-xr-x
ip6tables-save	216.6 KB	-rwxr-xr-x
ip6tables-translate	216.6 KB	-rwxr-xr-x
ipmaddr	21 KB	-rwxr-xr-x
iprconfig	408.03 KB	-rwxr-xr-x
iprdbg	137.57 KB	-rwxr-xr-x
iprdump	129.3 KB	-rwxr-xr-x
iprinit	125.28 KB	-rwxr-xr-x
iprsos	2.18 KB	-rwxr-xr-x
iprupdate	129.3 KB	-rwxr-xr-x
ipset	9.01 KB	-rwxr-xr-x
iptables	216.6 KB	-rwxr-xr-x
iptables-apply	3.43 KB	-rwxr-xr-x
iptables-restore	216.6 KB	-rwxr-xr-x
iptables-restore-translate	216.6 KB	-rwxr-xr-x
iptables-save	216.6 KB	-rwxr-xr-x
iptables-translate	216.6 KB	-rwxr-xr-x
iptstate	92.05 KB	-rwxr-xr-x
iptunnel	25 KB	-rwxr-xr-x
irqbalance	62.22 KB	-rwxr-xr-x
irqbalance-ui	37.22 KB	-rwxr-xr-x
isc-hmac-fixup	11.85 KB	-rwxr-xr-x
jk_check	11.2 KB	-rwxr-xr-x
jk_chrootlaunch	20.77 KB	-rwxr-xr-x
jk_chrootsh	32.73 KB	-rwsr-xr-x
jk_cp	4.12 KB	-rwxr-xr-x
jk_init	9.68 KB	-rwxr-xr-x
jk_jailuser	11.81 KB	-rwxr-xr-x
jk_list	4.93 KB	-rwxr-xr-x
jk_lsh	24.66 KB	-rwxr-xr-x
jk_socketd	29.05 KB	-rwxr-xr-x
jk_update	9.11 KB	-rwxr-xr-x
kexec	194.97 KB	-rwxr-xr-x
kpartx	49.05 KB	-rwxr-xr-x
lchage	16.38 KB	-rwxr-xr-x
ldattach	32.98 KB	-rwxr-xr-x
ldconfig	941.15 KB	-rwxr-xr-x
ledctl	92.25 KB	-rwxr-xr-x
ledmon	96.32 KB	-rwxr-xr-x
lfd	382.43 KB	-rwx------
lgroupadd	12 KB	-rwxr-xr-x
lgroupdel	11.99 KB	-rwxr-xr-x
lgroupmod	19.99 KB	-rwxr-xr-x
lid	16.26 KB	-rwxr-xr-x
lnewusers	19.99 KB	-rwxr-xr-x
lnstat	25.32 KB	-rwxr-xr-x
load_policy	12.27 KB	-rwxr-xr-x
logrotate	93.09 KB	-rwxr-xr-x
logsave	16.4 KB	-rwxr-xr-x
losetup	90.59 KB	-rwxr-xr-x
lpasswd	20.34 KB	-rwxr-xr-x
lshw	966.2 KB	-rwxr-xr-x
lsmod	159.46 KB	-rwxr-xr-x
lspci	94.78 KB	-rwxr-xr-x
luseradd	19.99 KB	-rwxr-xr-x
luserdel	16 KB	-rwxr-xr-x
lusermod	20 KB	-rwxr-xr-x
lvchange	2.6 MB	-r-xr-xr-x
lvconvert	2.6 MB	-r-xr-xr-x
lvcreate	2.6 MB	-r-xr-xr-x
lvdisplay	2.6 MB	-r-xr-xr-x
lvextend	2.6 MB	-r-xr-xr-x
lvm	2.6 MB	-r-xr-xr-x
lvm_import_vdo	13.14 KB	-r-xr-xr-x
lvmconfig	2.6 MB	-r-xr-xr-x
lvmdevices	2.6 MB	-r-xr-xr-x
lvmdiskscan	2.6 MB	-r-xr-xr-x
lvmdump	10.12 KB	-r-xr-xr-x
lvmpolld	200.66 KB	-r-xr-xr-x
lvmsadc	2.6 MB	-r-xr-xr-x
lvmsar	2.6 MB	-r-xr-xr-x
lvreduce	2.6 MB	-r-xr-xr-x
lvremove	2.6 MB	-r-xr-xr-x
lvrename	2.6 MB	-r-xr-xr-x
lvresize	2.6 MB	-r-xr-xr-x
lvs	2.6 MB	-r-xr-xr-x
lvscan	2.6 MB	-r-xr-xr-x
lwresd	840.73 KB	-rwxr-xr-x
makedumpfile	425.19 KB	-rwxr-xr-x
matchpathcon	12.36 KB	-rwxr-xr-x
mcelog	181.47 KB	-rwxr-xr-x
mdadm	611.59 KB	-rwxr-xr-x
mdmon	341.71 KB	-rwxr-xr-x
mediabuilder	826 B	-rwxr-xr-x
mii-diag	25.4 KB	-rwxr-xr-x
mii-tool	21.03 KB	-rwxr-xr-x
milter-greylist	336.08 KB	-rwxr-xr-x
mkdict	251 B	-rwxr-xr-x
mkdosfs	39.07 KB	-rwxr-xr-x
mkdumprd	12.54 KB	-rwxr-xr-x
mke2fs	138.45 KB	-rwxr-xr-x
mkfadumprd	2.23 KB	-rwxr-xr-x
mkfs	16.47 KB	-rwxr-xr-x
mkfs.cramfs	41.26 KB	-rwxr-xr-x
mkfs.ext2	138.45 KB	-rwxr-xr-x
mkfs.ext3	138.45 KB	-rwxr-xr-x
mkfs.ext4	138.45 KB	-rwxr-xr-x
mkfs.fat	39.07 KB	-rwxr-xr-x
mkfs.minix	86.54 KB	-rwxr-xr-x
mkfs.msdos	39.07 KB	-rwxr-xr-x
mkfs.vfat	39.07 KB	-rwxr-xr-x
mkfs.xfs	474.59 KB	-rwxr-xr-x
mkhomedir_helper	24.42 KB	-rwxr-xr-x
mklost+found	11.85 KB	-rwxr-xr-x
mksquashfs	186.84 KB	-rwxr-xr-x
mkswap	86.46 KB	-rwxr-xr-x
modinfo	159.46 KB	-rwxr-xr-x
modprobe	159.46 KB	-rwxr-xr-x
mtr	110.92 KB	-rwxr-xr-x
mtr-packet	58.3 KB	-rwxr-xr-x
mysqld	62.52 MB	-rwxr-xr-x
named	840.73 KB	-rwxr-xr-x
named-checkconf	36.77 KB	-rwxr-xr-x
named-checkzone	36.63 KB	-rwxr-xr-x
named-compilezone	36.63 KB	-rwxr-xr-x
named-journalprint	11.84 KB	-rwxr-xr-x
nameif	16.98 KB	-rwxr-xr-x
newusers	107.21 KB	-rwxr-xr-x
nft	20.4 KB	-rwxr-xr-x
nologin	11.87 KB	-rwxr-xr-x
nsec3hash	12.28 KB	-rwxr-xr-x
nstat	87.14 KB	-rwxr-xr-x
opendkim	222.52 KB	-rwxr-xr-x
opendkim-default-keygen	1.4 KB	-rwxr-xr-x
opendkim-reportstats	14.16 KB	-rwxr-xr-x
ownership	16.43 KB	-rwxr-xr-x
packer	13.05 KB	-rwxr-xr-x
pam_console_apply	45.18 KB	-rwxr-xr-x
pam_timestamp_check	11.86 KB	-rwsr-xr-x
paperconfig	4.07 KB	-rwxr-xr-x
parted	85.6 KB	-rwxr-xr-x
partprobe	16.39 KB	-rwxr-xr-x
partx	94.48 KB	-rwxr-xr-x
pdata_tools	1.43 MB	-rwxr-xr-x
php-fpm	4.8 MB	-rwxr-xr-x
pidof	16.55 KB	-rwxr-xr-x
ping	66.08 KB	-rwxr-xr-x
ping6	66.08 KB	-rwxr-xr-x
pivot_root	12.37 KB	-rwxr-xr-x
plipconfig	12.71 KB	-rwxr-xr-x
pluginviewer	20.57 KB	-rwxr-xr-x
postalias	20.39 KB	-rwxr-xr-x
postcat	20.06 KB	-rwxr-xr-x
postconf	191.06 KB	-rwxr-xr-x
postdrop	20.42 KB	-rwxr-sr-x
postfix	16.27 KB	-rwxr-xr-x
postgrey	37.94 KB	-rwxr-xr-x
postgreyreport	23.8 KB	-rwxr-xr-x
postkick	11.97 KB	-rwxr-xr-x
postlock	12.26 KB	-rwxr-xr-x
postlog	12.14 KB	-rwxr-xr-x
postmap	24.41 KB	-rwxr-xr-x
postmulti	28.91 KB	-rwxr-xr-x
postqueue	24.59 KB	-rwxr-sr-x
postsuper	28.81 KB	-rwxr-xr-x
posttls-finger	44.79 KB	-rwxr-xr-x
poweroff	218.45 KB	-rwxr-xr-x
proftpd	1.17 MB	-rwxr-xr-x
pvchange	2.6 MB	-r-xr-xr-x
pvck	2.6 MB	-r-xr-xr-x
pvcreate	2.6 MB	-r-xr-xr-x
pvdisplay	2.6 MB	-r-xr-xr-x
pvmove	2.6 MB	-r-xr-xr-x
pvremove	2.6 MB	-r-xr-xr-x
pvresize	2.6 MB	-r-xr-xr-x
pvs	2.6 MB	-r-xr-xr-x
pvscan	2.6 MB	-r-xr-xr-x
pwck	57.26 KB	-rwxr-xr-x
pwconv	53.09 KB	-rwxr-xr-x
pwhistory_helper	20.42 KB	-rwxr-xr-x
pwunconv	53.12 KB	-rwxr-xr-x
quot	78.67 KB	-rwxr-xr-x
quotacheck	115.75 KB	-rwxr-xr-x
quotaoff	83.16 KB	-rwxr-xr-x
quotaon	83.16 KB	-rwxr-xr-x
quotastats	16.54 KB	-rwxr-xr-x
raid-check	3.7 KB	-rwxr-xr-x
rdisc	24.55 KB	-rwxr-xr-x
rdma	160.91 KB	-rwxr-xr-x
rdma-ndd	15.95 KB	-rwxr-xr-x
readprofile	20.54 KB	-rwxr-xr-x
realm	144.32 KB	-rwxr-xr-x
reboot	218.45 KB	-rwxr-xr-x
repquota	83.24 KB	-rwxr-xr-x
resize2fs	64.9 KB	-rwxr-xr-x
resizepart	41.56 KB	-rwxr-xr-x
resolvconf	195.74 KB	-rwxr-xr-x
restorecon	20.52 KB	-rwxr-xr-x
restorecon_xattr	16.41 KB	-rwxr-xr-x
rfkill	53.48 KB	-rwxr-xr-x
rmmod	159.46 KB	-rwxr-xr-x
rndc	36.52 KB	-rwxr-xr-x
rndc-confgen	20.44 KB	-rwxr-xr-x
rngd	104.84 KB	-rwxr-xr-x
rotatelogs	24.54 KB	-rwxr-xr-x
route	67.63 KB	-rwxr-xr-x
rsyslogd	724.33 KB	-rwxr-xr-x
rtacct	46.93 KB	-rwxr-xr-x
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Code Editor : postgrey

#!/usr/bin/perl -T -w

# Postgrey: a Postfix Greylisting Policy Server
# Copyright (c) 2004-2007 ETH Zurich
# Copyright (c) 2007 Open Systems AG, Switzerland
# released under the GNU General Public License

# see the documentation with 'perldoc postgrey'

package postgrey;
use strict;
use Pod::Usage;
use Getopt::Long 2.25 qw(:config posix_default no_ignore_case);
use NetAddr::IP;
use Net::Server; # used only to find out which version we use
use Net::Server::Multiplex;
use BerkeleyDB;
use Fcntl ':flock'; # import LOCK_* constants
use Sys::Hostname;
use Sys::Syslog; # used only to find out which version we use
use POSIX qw(strftime setlocale LC_ALL);

use vars qw(@ISA);
@ISA = qw(Net::Server::Multiplex);

my $VERSION = '1.37';
my $DEFAULT_DBDIR = '/var/spool/postfix/postgrey';
my $CONFIG_DIR = '/etc/postfix';

sub read_clients_whitelists($)
{
    my ($self) = @_;

my @whitelist_clients = ();
    my @whitelist_ips = ();
    for my $f (@{$self->{postgrey}{whitelist_clients_files}}) {
        if(open(CLIENTS, $f)) {
            while(<CLIENTS>) {
                s/#.*$//; s/^\s+//; s/\s+$//; next if $_ eq '';
                if(/^\/(\S+)\/$/) {
                    # regular expression
                    push @whitelist_clients, qr{$1}i;
                }
                elsif(/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}(?:\/\d{1,2})?$/) {
                    # IPv4 address (with or without netmask)
                    my $ip = NetAddr::IP->new($_);
                    push @whitelist_ips, $ip if defined $ip;
                }
                elsif(/^\d{1,3}\.\d{1,3}\.\d{1,3}$/) {
                    # Partial IPv4 address (/24)
                    my $ip = NetAddr::IP->new($_, 24);
                    push @whitelist_ips, $ip if defined $ip;
                }
                elsif(/^\d{1,3}\.\d{1,3}$/) {
                    # Partial IPv4 address (/16)
                    my $ip = NetAddr::IP->new($_, 24);
                    push @whitelist_ips, $ip if defined $ip;
                }
                elsif(/^.*\:.*\:.*(?:\/\d{1,3})?$/) {
                    # IPv6 address (with or without netmask)
                    my $ip = NetAddr::IP->new($_);
                    push @whitelist_ips, $ip if defined $ip;
                }
                # note: we had ^[^\s\/]+$ but it triggers a bug in perl 5.8.0
                elsif(/^\S+$/) {
                    push @whitelist_clients, qr{(?:^|\.)\Q$_\E$}i;
                }
                else {
                    warn "$f line $.: doesn't look like a hostname\n";
                }
            }
        }
        else {
            # do not warn about .local file: maybe the user just doesn't have one
            warn "can't open $f: $!\n" unless $f =~ /\.local$/;
        }
        close(CLIENTS);
    }
    $self->{postgrey}{whitelist_clients} = \@whitelist_clients;
    $self->{postgrey}{whitelist_ips}     = \@whitelist_ips;
}

sub read_recipients_whitelists($)
{
    my ($self) = @_;

my @whitelist_recipients = ();
    for my $f (@{$self->{postgrey}{whitelist_recipients_files}}) {
        if(open(RECIPIENTS, $f)) {
            while(<RECIPIENTS>) {
                s/#.*$//; s/^\s+//; s/\s+$//; next if $_ eq '';
                my ($user, $domain) = split(/\@/, $_, 2);
                if(/^\/(\S+)\/$/) {
                    # regular expression
                    push @whitelist_recipients, qr{$1}i;
                }
                elsif(!/^\S+$/) {
                    warn "$f line $.: doesn't look like an address\n";
                }
                # postfix access(5) syntax:
                elsif(defined $domain and $domain ne '') {
                    # user@domain (match also user+extension@domain)
                    push @whitelist_recipients, qr{^\Q$user\E(?:\+[^@]+)?\@\Q$domain\E$}i;
                }
                elsif(defined $domain) {
                    # user@
                    push @whitelist_recipients, qr{^\Q$user\E(?:\+[^@]+)?\@}i;
                }
                else {
                    # domain ($user is the domain)
                    push @whitelist_recipients, qr{(?:\@|\.)\Q$user\E$}i;
                }
            }
        }
        else {
            # do not warn about .local file: maybe the user just doesn't have one
            warn "can't open $f: $!\n" unless $f =~ /\.local$/;
        }
        close(RECIPIENTS);
    }
    $self->{postgrey}{whitelist_recipients} = \@whitelist_recipients;
}

sub do_sender_substitutions($$)
{
    my ($self, $addr) = @_;

my ($user, $domain) = split(/@/, $addr, 2);
    defined $domain or return $addr;

# BATV is defined as prvs=tag-val=loc-core@, but sometimes shows up
    # as prvs=loc-core=tag-val@...
    if ($user =~ /^prvs=/) {
	my @a = split(/=/, $user);
	if ($#a == 2) {
	    if ($a[1] =~ /^[0-9a-z]{10}/ && $a[2] !~ /^[0-9a-z]{10}/) {
		$user = $a[2];
	    } elsif ($a[2] =~ /^[0-9a-z]{10}/ && $a[1] !~ /^[0-9a-z]{10}/) {
		$user = $a[1];
	    } else {
		# throw a coin, pick the standard
		$user = $a[2];
	    }
	}
    }

# strip extension, used sometimes for mailing-list VERP
    $user =~ s/\+.*//;
    # replace numbers in VERP addresses with '#' so that
    # we don't create a new key for each mail
    $user =~ s/\b\d+\b/#/g;
    return "$user\@$domain";
}

# split network and host part and return both
sub do_client_substitutions($$$)
{
    my ($self, $ip, $revdns) = @_;

if($self->{postgrey}{lookup_by_host}) {
        return ($ip, undef);
    }

my $ipaddr;
    if($ip->bits() == 32) {
        $ipaddr = NetAddr::IP->new($ip->addr, $self->{postgrey}{ipv4cidr});
    }
    elsif($ip->bits() == 128) {
        $ipaddr = NetAddr::IP->new($ip->addr, $self->{postgrey}{ipv6cidr});
    }
    else {
        warn "NetAddr::IP->bits() neither 32 nor 128???\n";
        return ($ip, undef);
    }
    return ($ipaddr->network()->addr(), undef);
}

sub mylog($$$)
{
    my ($self, $level, $string) = @_;
    $string =~ s/\%/%%/g; # for Net::Server <= 0.87
    if(!defined $Sys::Syslog::VERSION or $Sys::Syslog::VERSION lt '0.15'
    or !defined $Net::Server::VERSION or $Net::Server::VERSION lt '0.94') {
        # Workaround for a crash when syslog daemon is temporarily not
        # present (for example on syslog rotation).
        # Note that this is not necessary with Sys::Syslog >= 0.15 and
        # Net::Server >= 0.94 thanks to the nofatal Option.
        eval {
            local $SIG{"__DIE__"} = sub { };
            $self->log($level, $string);
        };
    }
    else {
        $self->log($level, $string);
    }
}

sub mylog_action($$$;$$)
{
    my ($self, $attr, $action, $reason, $additional_info) = @_;

my $str;
    $str .= $attr->{queue_id} . ': ' if $attr->{queue_id};
    my @info = ("action=$action");
    push @info, "reason=$reason" if defined $reason;
    push @info, $additional_info if defined $additional_info;
    for my $a (qw(client_name client_address sender recipient)) {
        push @info, "$a=$attr->{$a}" if $attr->{$a};
    }
    $str .= join(', ', @info);
    $self->mylog(2, $str);
}

sub do_maintenance($$)
{
    my ($self, $now) = @_;
    my $db     = $self->{postgrey}{db};
    my $db_env = $self->{postgrey}{db_env};

# remove old db logs

$self->mylog(1, "cleaning up old logs...");
    $db_env->txn_checkpoint(0, 0) and
        warn "can't checkpoint !? $BerkeleyDB::Error";
    for my $l ($db_env->log_archive(DB_ARCH_ABS)) {
        $self->mylog(1, "rm $l");
        unlink $l or warn "can't remove db log $l: $!\n";
    }

# remove old keys
    # this is very expensive:  We might refuse to speak to postfix for too
    # long, after which clients will start getting "450 Server configuration
    # problem" errors... do it only during the night and only if at least one
    # day has passed
    my $hour = (localtime($now))[2];
    if($hour > 1 and $hour < 7 and
        $now - $self->{postgrey}{last_maint_keys} >= 82800)
    {
        $self->mylog(1, "cleaning up old entries...");
        my $max_age = $self->{postgrey}{max_age};
        my $retry_window = $self->{postgrey}{retry_window};
        my ($nr_keys_before, $nr_keys_after) = (0,0);
        # note: deleteing hash elements in a 'each'-loop isn't supported
        # that's why we first put them in @old_keys and then delete them
        my @old_keys = ();
        while (my ($key, $value) = each %$db) {
            $nr_keys_before++;
            my ($first, $last) = split(/,/,$value);
            if(not defined $last) {
                # shouldn't happen
                push @old_keys, $key;
            }
            elsif($now - $last > $max_age) {
                # last-seen passed max-age
                push @old_keys, $key;
            }
            elsif($last-$first < $self->{postgrey}{delay} and $now-$last > $retry_window) {
                # no successful entry yet and last seen passed retry-window
                push @old_keys, $key;
            }
            else {
                $nr_keys_after++;
            }
        }
        my $db_obj = $self->{postgrey}{db_obj};
        my $txn = $db_env->txn_begin();
        $db_obj->Txn($txn);
        for my $key (@old_keys) { delete $db->{$key}; }
        $txn->txn_commit();
        
        $self->mylog(1, "cleaning main database finished. before: $nr_keys_before, after: $nr_keys_after");

if($self->{postgrey}{awl_clients}) {
            # cleanup clients auto-whitelist database
            my $cawl_db  = $self->{postgrey}{db_cawl};
            ($nr_keys_before, $nr_keys_after) = (0, 0);
            $nr_keys_after=0;
            my @old_keys_cawl = ();
            while (my ($key, $value) = each %$cawl_db) {
                my $cawl_last_seen = (split(/,/, $value))[1];
                $nr_keys_before++;
                if($now - $cawl_last_seen > $max_age) {
                    push @old_keys_cawl, $key;
                }
                else {
                    $nr_keys_after++;
                }
            }
            my $db_cawl_obj = $self->{postgrey}{db_cawl_obj};
            $txn = $db_env->txn_begin();
            $db_cawl_obj->Txn($txn);
            for my $key (@old_keys_cawl) { delete $cawl_db->{$key}; }
            $txn->txn_commit();

$self->mylog(1, "cleaning clients database finished. before: $nr_keys_before, after: $nr_keys_after");
        }

$self->{postgrey}{last_maint_keys}=$now;
    }
}

sub is_new_instance($$)
{
    my ($self, $inst) = @_;
    return 1 if not defined $inst; # in case the 'instance' parameter
                                   # was not supplied by the client (Exim)

# we keep a list of the last 20 "instances", which identify unique messages
    # so that for example we only put one X-Greylist header per message.
    $self->{postgrey}{instances} = [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
        unless defined $self->{postgrey}{instances};

my $i = $self->{postgrey}{instances};
    return 0 if scalar grep { $_ eq $inst } @$i;
    
    # put new value into the array
    unshift @$i, $inst;
    pop @$i;

return 1;
}

# main routine: based on attributes specified as argument, return policy decision
sub smtpd_access_policy($$)
{
    my ($self, $now, $attr) = @_;
    my $db  = $self->{postgrey}{db};
    # This attribute occurs in connections from the policy-test script,
    # not in a regular postfix query connection
    if(defined $attr->{policy_test_time}) { $now = $attr->{policy_test_time} }

# make sure that important attributes are defined
    for my $a (qw(client_address client_name recipient sender)) {
        defined $attr->{$a} or do {
            warn "attribute missing: $a\n";
            return 'DUNNO';
        };
    }

# parse "client_address" into a NetAddr::IP object
    my $ip = NetAddr::IP->new($attr->{client_address});
    defined $attr->{client_address} or do {
        warn "can't parse client_address from postfix: $attr->{client_address}\n";
        return 'DUNNO';
    };
    $attr->{client_address_ip} = $ip;

# whitelists: client name
    for my $w (@{$self->{postgrey}{whitelist_clients}}) {
        if($attr->{client_name} =~ $w) {
            $self->mylog_action($attr, 'pass', 'client whitelist');
            return 'DUNNO';
        }
    }

# whitelists: client ip
    for my $w (@{$self->{postgrey}{whitelist_ips}}) {
        if($attr->{client_address_ip}->within($w)) {
            $self->mylog_action($attr, 'pass', 'client whitelist');
            return 'DUNNO';
        }
    }

# whitelists: recipient
    for my $w (@{$self->{postgrey}{whitelist_recipients}}) {
        if($attr->{recipient} =~ $w) {
            $self->mylog_action($attr, 'pass', 'recipient whitelist');
            return 'DUNNO';
        }
    }

# auto whitelist clients (see below for explanation)
    my ($cawl_db, $cawl_key, $cawl_count, $cawl_last);
    if($self->{postgrey}{awl_clients}) {
        $cawl_db  = $self->{postgrey}{db_cawl};
        $cawl_key = $attr->{client_address_ip}->addr();
        if ($self->{postgrey}{privacy}) {
             $cawl_key = Digest::SHA::sha1_hex($cawl_key);
        }
        my $cawl_val = $cawl_db->{$cawl_key};
        ($cawl_count, $cawl_last) = split(/,/,$cawl_val) if defined $cawl_val;
        
        # whitelist if count is enough
        if(defined $cawl_count and $cawl_count >= $self->{postgrey}{awl_clients})
        {
            if(($now >= $cawl_last+3600) or ($cawl_last > $now)) {
                $cawl_count++; # for statistics
                $cawl_db->{$cawl_key}=$cawl_count.','.$now;
            }
            $self->mylog_action($attr, 'pass', 'client AWL');
            return 'DUNNO';
        }
    }

# lookup
    my $sender = $self->do_sender_substitutions($attr->{sender});
    my ($client_net, $client_host) =
        $self->do_client_substitutions($attr->{client_address_ip}, $attr->{client_name});
    my $key    = lc "$client_net/$sender/$attr->{recipient}";
    if ($self->{postgrey}{privacy}) {
        $key = Digest::SHA::sha1_hex($key);
    }
    my $val    = $db->{$key};
    my $first;
    my $last_was_successful=0;
    if(defined $val) {
        my $last;
        ($first, $last) = split(/,/,$val);
        # find out if the last time was unsuccessful, so that we can add a header
        # to say how much had to be waited
        if($last - $first >= $self->{postgrey}{delay}) {
            $last_was_successful=1;
        }
        else {
            # discard stored first-seen if it is the first retrial and
            # it is beyond the retry_window
            $first = $now if $now-$first > $self->{postgrey}{retry_window};
        }
        # test for invalid first-seen date in the future
        if($first > $now) {
            $self->mylog(1, "correcting date for first seen in the future!");
            $first = $now;
        }
    }
    else {
        $first = $now;
    }

# update (put as last element stripped host-part if it was stripped)
    if(defined $client_host) {
        $db->{$key}="$first,$now,$client_host";
    }
    else {
        $db->{$key}="$first,$now";
    }

my $diff = $self->{postgrey}{delay} - ($now - $first);

# auto whitelist clients
    # algorithm:
    # - on successful entry in the greylist db of a triplet:
    #   - client not whitelisted yet? -> increase count, whitelist if count > 10 or so
    #   - client whitelisted already? -> update last-seen timestamp
    if($self->{postgrey}{awl_clients}) {
        # greylisting succeeded
        if($diff <= 0 and !$last_was_successful) {
            # enough time has passed (record only one attempt per hour)
            if(! defined $cawl_last or $now >= $cawl_last + 3600) {
                # ok, increase count
                $cawl_count++;
                $cawl_db->{$cawl_key}=$cawl_count.','.$now;
                my $client = $attr->{client_name} ?
                    $attr->{client_name}.'['.$attr->{client_address_ip}->addr().']' :
                    $attr->{client_address_ip}->addr();
                $self->mylog(1, "whitelisted: $client")
                    if $cawl_count==$self->{postgrey}{awl_clients};
            }
        }
    }

# not enough waited? -> greylist
    if ($diff > 0 ) {
        my $msg = $self->{postgrey}{greylist_text};
        # Workaround for an Exchange bug related to Greylisting:
        # use DSN 4.2.0 instead of the default 4.7.1. This works
        # only with Postfix 2.3 though and we know that Postfix >= 2.3
        # always defines the etrn_domain attribute (is this really true and
        # guaranteed in future versions? I don't know...)
        $msg = '4.2.0 ' . $msg if defined $attr->{etrn_domain} and
                          $msg !~ /^\d/;
        $msg =~ s/\%s/$diff/;
        my $recip_domain = $attr->{recipient}; $recip_domain =~ s/.*\@//;
        $msg =~ s/\%r/$recip_domain/;
        $self->mylog_action($attr, 'greylist',
            $now != $first ? "early-retry (${diff}s missing)" : "new"
            );
        return "$self->{postgrey}{greylist_action} $msg";
    }

# X-Greylist header:
    if(!$last_was_successful and $self->is_new_instance($attr->{instance})) {
        # add X-Greylist header
        my $date = strftime("%a, %d %b %Y %T %Z", localtime);
        my $delay = $now-$first;
        $self->mylog_action($attr, 'pass', 'triplet found', 'delay='.($delay));
        my $msg = $self->{postgrey}{x_greylist_header};
        $msg =~ s/\%t/$delay/;
        $msg =~ s/\%v/$VERSION/;
        $msg =~ s/\%d/$date/;
        $msg =~ s/\%h/$self->{postgrey}{hostname}/;
        return 'PREPEND ' . $msg;
    }

$self->mylog_action($attr, 'pass', 'triplet found');
    return 'DUNNO';
}

sub main()
{
    # save arguments for Net:Server HUP restart
    my @ARGV_saved = @ARGV;

# do not output any localized texts!
    setlocale(LC_ALL, 'C');

# parse options
    my %opt = ();
    GetOptions(\%opt, 'help|h', 'man', 'version', 'noaction|no-action|n',
        'verbose|v', 'quiet|q', 'daemonize|d',
        'unix|u=s', 'inet|i=s', 'socketmode=s',
        'user=s', 'group=s', 'dbdir=s', 'pidfile=s', 'delay=i', 'max-age=i',
        'lookup-by-subnet', 'lookup-by-host', 'ipv4cidr=i', 'ipv6cidr=i', 'auto-whitelist-clients:s', 
        'whitelist-clients=s@', 'whitelist-recipients=s@',
        'syslogfacility|syslog-facility|facility=s',
        'retry-window=s', 'greylist-action=s', 'greylist-text=s', 'privacy',
        'hostname=s', 'exim', 'listen-queue-size=i', 'x-greylist-header=s',
    ) or exit(1);
    # note: lookup-by-subnet can be given for compatibility, but it is default
    # so do not do nothing with it...
    # note: auto-whitelist-clients:s and not auto-whitelist-clients:n so that
    # we can differentiate between --auto-whitelist-clients=0 and
    # auto-whitelist-clients

if($opt{help})     { pod2usage(1) }
    if($opt{man})      { pod2usage(-exitstatus => 0, -verbose => 2) }
    if($opt{version})  { print "postgrey $VERSION\n"; exit(0) }
    if($opt{noaction}) { die "ERROR: don't know how to \"no-action\".\n" }

defined $opt{unix} or defined $opt{inet} or
        die "ERROR: --unix or --inet must be specified\n";

# bind only localhost if no host is specified
    if(defined $opt{inet} and $opt{inet}=~/^\d+$/) {
        $opt{inet} = "localhost:$opt{inet}";
    }

# retry window
    my $retry_window = 24*3600*2; # default: 2 days
    if(defined $opt{'retry-window'}) {
        if($opt{'retry-window'} =~ /^(\d+)h$/i) {
            $retry_window = $1 * 3600;
        }
        elsif($opt{'retry-window'} =~ /^\d+$/) {
            $retry_window = $opt{'retry-window'} * 24 * 3600;
        }
        else {
            die "ERROR: --retry-window must be either a number of days or a number\n",
                "       followed by 'h' for hours ('6h' for example).\n";
        }
    }

# untaint what is given on --dbdir. It is not security sensitive since
    # it is provided by the admin
    if($opt{dbdir}) {
        $opt{dbdir} =~ /^(.*)$/; $opt{dbdir} = $1;
    }
    # untaint what is given on --pidfile. It is not security sensitive since
    # it is provided by the admin
    if($opt{pidfile}) {
        $opt{pidfile} =~ /^(.*)$/; $opt{pidfile} = $1;
    }
    # untaint what is given on --inet. It is not security sensitive since
    # it is provided by the admin
    if($opt{inet}) {
        $opt{inet} =~ /^(.*)$/; $opt{inet} = $1;
    }
    # untaint what is given on --socketmode. It is not security sensitive since
    # it is provided by the admin
    if($opt{socketmode}) {
        $opt{socketmode} =~ /^(.*)$/; $opt{socketmode} = $1;
    }

# determine proper "logsock" for Sys::Syslog
    my $syslog_logsock;
    if(defined $Sys::Syslog::VERSION and $Sys::Syslog::VERSION ge '0.15'
    and defined $Net::Server::VERSION and $Net::Server::VERSION ge '0.97') {
        # use 'native' when Sys::Syslog >= 0.15
        $syslog_logsock = 'native';
    }
    elsif($^O eq 'solaris') {
        # 'stream' is broken and 'unix' doesn't work on Solaris: only 'inet'
        # seems to be useable with Sys::Syslog < 0.15
        $syslog_logsock = 'inet';
    }
    else {
        $syslog_logsock = 'unix';
    }

# Workaround: Net::Server doesn't allow for a value of 'listen' higher than 999
    if(defined $opt{'listen-queue-size'} and $opt{'listen-queue-size'} > 999) {
        $opt{'listen-queue-size'} = 999;
    }

# create Net::Server object and run it
    my $server = bless {
        server => {
            commandline      => [ 'postgrey', @ARGV_saved ],
            port             => [ $opt{inet} ? $opt{inet} : $opt{unix}."|unix" ],
            proto            => $opt{inet} ? 'tcp' : 'unix',
            socketmode       => $opt{socketmode} || '0666',
            user             => $opt{user} || 'postgrey',
            group            => $opt{group} || 'postgrey',
            dbdir            => $opt{dbdir} || $DEFAULT_DBDIR,
            setsid           => $opt{daemonize} ? 1 : undef,
            pid_file         => $opt{daemonize} ? $opt{pidfile} : undef,
            log_level        => $opt{quiet} ? 1 : ($opt{verbose} ? 3 : 2),
            log_file         => $opt{daemonize} ? 'Sys::Syslog' : undef,
            syslog_logsock   => $syslog_logsock,
            syslog_facility  => $opt{syslogfacility} || 'mail',
            syslog_ident     => 'postgrey',
            listen           => $opt{'listen-queue-size'} ? $opt{'listen-queue-size'} : undef,
        },
        postgrey => {
            delay            => $opt{delay}     || 300,
            max_age          => $opt{'max-age'} || 35,
            last_maint       => time,
            last_maint_keys  => 0, # do it on the first night
            lookup_by_host   => $opt{'lookup-by-host'},
            ipv4cidr         => $opt{'ipv4cidr'} || 24,
            ipv6cidr         => $opt{'ipv6cidr'} || 64,            
            awl_clients      => defined $opt{'auto-whitelist-clients'} ?
                ($opt{'auto-whitelist-clients'} ne '' ?
                    $opt{'auto-whitelist-clients'} : 5) : 5,
            retry_window     => $retry_window,
            greylist_action  => $opt{'greylist-action'} || 'DEFER_IF_PERMIT',
            greylist_text    => $opt{'greylist-text'} || 'Greylisted, see http://postgrey.schweikert.ch/help/%r.html',
            whitelist_clients_files    => $opt{'whitelist-clients'} ||
                [ "$CONFIG_DIR/postgrey_whitelist_clients" ,
                  "$CONFIG_DIR/postgrey_whitelist_clients.local" ],
            whitelist_recipients_files => $opt{'whitelist-recipients'} ||
                [ "$CONFIG_DIR/postgrey_whitelist_recipients" ],
            privacy => defined $opt{'privacy'},
            hostname => defined $opt{hostname} ? $opt{hostname} : hostname,
            exim => defined $opt{'exim'},
            x_greylist_header  => $opt{'x-greylist-header'} || 'X-Greylist: delayed %t seconds by postgrey-%v at %h; %d',
        },
    }, 'postgrey';

# max_age is in days
    $server->{postgrey}{max_age}*=3600*24;

# be sure to put in syslog any warnings / fatal errors
    if(defined $server->{server}{log_file} and $server->{server}{log_file} eq 'Sys::Syslog') {
        $SIG{__WARN__} = sub { Sys::Syslog::syslog('warning', '%s', "WARNING: $_[0]") };
        $SIG{__DIE__}  = sub { Sys::Syslog::syslog('crit', '%s', "FATAL: $_[0]"); die @_; };
    }

# read whitelist
    $server->read_clients_whitelists();
    $server->read_recipients_whitelists();

# --privacy requires Digest::SHA
    if($opt{'privacy'}) {
        require Digest::SHA;
    }

$0 = join(' ', @{$server->{server}{commandline}});
    $server->run;

# shouldn't get here
    $server->mylog(1, "Exiting!");
    exit 1;
}

##### Net::Server::Multiplex methods:

# reload whitelists on HUP
sub sig_hup {
    my $self = shift;
    $self->mylog(1, "HUP received: reloading whitelists...");
    $self->read_clients_whitelists();
    $self->read_recipients_whitelists();
}

sub post_bind_hook()
{
    my ($self) = @_;

# set unix socket permissions
    if($self->{server}{port}[0] =~ /^(.*)\|unix$/) {
        chmod oct($self->{server}{socketmode}), $1;
    }
}

sub pre_loop_hook()
{
    my ($self) = @_;

# write files with mode 600
    umask 0077;

# ensure that only one instance of postgrey is running
    my $lock = "$self->{server}{dbdir}/postgrey.lock";
    open(LOCK, ">>$lock") or die "ERROR: can't open lock file: $lock\n";
    flock(LOCK, LOCK_EX|LOCK_NB) or die "ERROR: locked: $lock\n";

# my $setflags = DB_TXN_NOSYNC;
    my $setflags = 0; # see http://bugs.debian.org/334430
    if($BerkeleyDB::db_version >= 4.1) {
        $setflags |= BerkeleyDB::DB_AUTO_COMMIT;
    }
    else {
        warn "disabling DB_AUTO_COMMIT because you are using BerkeleyDB version $BerkeleyDB::db_version. Version 4.1 is required for DB_AUTO_COMMIT. You might have problems in case of system failures to recover the database.\n";
    }

# open database with transactions, logging and auto-commit to make it as
    # safe as possible. Note that locking is not required since only one
    # process is running
    $self->{postgrey}{db_env} = BerkeleyDB::Env->new(
        -Home     => $self->{server}{dbdir},
        -Flags    => DB_CREATE|DB_RECOVER|DB_INIT_TXN|DB_INIT_MPOOL|DB_INIT_LOG,
        -SetFlags => $setflags,
    ) or die "ERROR: can't create DB environment: $! (" .
             "dbdir: ".$self->{server}{dbdir}." uid/gid: $<,$>)\n";

$self->{postgrey}{db_obj} = tie(%{$self->{postgrey}{db}}, 'BerkeleyDB::Btree',
        -Filename => 'postgrey.db',
        -Flags    => DB_CREATE,
        -Env      => $self->{postgrey}{db_env}
    ) or die "ERROR: can't create database $self->{server}{dbdir}/postgrey.db: $!\n";

if($self->{postgrey}{awl_clients}) {
        $self->{postgrey}{db_cawl_obj} = tie(%{$self->{postgrey}{db_cawl}}, 'BerkeleyDB::Btree',
            -Filename => 'postgrey_clients.db',
            -Flags    => DB_CREATE,
            -Env      => $self->{postgrey}{db_env}
        ) or die "ERROR: can't create database $self->{server}{dbdir}/postgrey_clients.db: $!\n";
    }
}

sub mux_input()
{
    my ($self, $mux, $fh, $in_ref) = @_;
    defined $self->{postgrey_attr} or $self->{postgrey_attr} = {};
    my $attr = $self->{postgrey_attr};

# consume entire lines
    while ($$in_ref =~ s/^([^\r\n]*)\r?\n//) {
        next unless defined $1;
        my $in = $1;
        if($in =~ /([^=]+)=(.*)/) {
            # read attributes
            $attr->{substr($1, 0, 512)} = substr($2, 0, 512);
        }
        elsif($in eq '') {
            defined $attr->{request} or $attr->{request}='';
            if($attr->{request} ne 'smtpd_access_policy') {
                $self->{net_server}->mylog(0, "unrecognized request type: '$attr->{request}'");
            }
            else {
                my $now = time;

# decide
                my $action = $self->{net_server}->smtpd_access_policy($now, $attr);

# give answer
                print $fh "action=$action\n\n";

# attempt maintenance if one hour has passed since the last one
                my $server = $self->{net_server};
                if($server->{postgrey}{last_maint} && 
                    $now-$server->{postgrey}{last_maint} >= 3600)
                {
                    $server->{postgrey}{last_maint} = $now;
                    $server->do_maintenance($now);
                }

# close the filehandle if --exim is set
                if ($self->{net_server}->{postgrey}{exim}) {
                    close($fh);
                    last;
                } 
            }
            $self->{postgrey_attr} = {};
        }
        else {
            $self->{net_server}->mylog(1, "ignoring garbage: <".substr($in, 0, 100).">");
        }
    }
}

sub fatal_hook()
{
    my ($self, $error, $package, $file, $line) = @_;
    # Net::Server calls $self->server_close but, unfortunately,
    # it does exit(0) (with Net::Server 0.97)...
    # It is however useful for init-script to detect non-zero exit codes
    die('ERROR: ' . $error);
}

main;

__END__

=head1 NAME

postgrey - Postfix Greylisting Policy Server

=head1 SYNOPSIS

B<postgrey> [I<options>...]

-h, --help              display this help and exit
     --version           output version information and exit
 -v, --verbose           increase verbosity level
     --syslog-facility   Syslog facility to use (default mail)
 -q, --quiet             decrease verbosity level
 -u, --unix=PATH         listen on unix socket PATH
     --socketmode=MODE   unix socket permission (default 0666)
 -i, --inet=[HOST:]PORT  listen on PORT, localhost if HOST is not specified
 -d, --daemonize         run in the background
     --pidfile=PATH      put daemon pid into this file
     --user=USER         run as USER (default: postgrey)
     --group=GROUP       run as group GROUP (default: postgrey)
     --dbdir=PATH        put db files in PATH (default: /var/spool/postfix/postgrey)
     --delay=N           greylist for N seconds (default: 300)
     --max-age=N         delete entries older than N days since the last time
                         that they have been seen (default: 35)
     --retry-window=N    allow only N days for the first retrial (default: 2)
                         append 'h' if you want to specify it in hours
     --greylist-action=A if greylisted, return A to Postfix (default: DEFER_IF_PERMIT)
     --greylist-text=TXT response when a mail is greylisted
                         (default: Greylisted + help url, see below)
     --lookup-by-subnet  strip the last N bits from IP addresses, determined by ipv4cidr and ipv6cidr (default)
     --ipv4cidr=N        What cidr to use for the subnet on IPv4 addresses when using lookup-by-subnet (default: 24)
     --ipv6cidr=N        What cidr to use for the subnet on IPv6 addresses when using lookup-by-subnet (default: 64)
     --lookup-by-host    do not strip the last 8 bits from IP addresses
     --privacy           store data using one-way hash functions
     --hostname=NAME     set the hostname (default: `hostname`)
     --exim              don't reuse a socket for more than one query (exim compatible)
     --whitelist-clients=FILE     default: /etc/postfix/postgrey_whitelist_clients
     --whitelist-recipients=FILE  default: /etc/postfix/postgrey_whitelist_recipients
     --auto-whitelist-clients=N   whitelist host after first successful delivery
                                  N is the minimal count of mails before a client is 
                                  whitelisted (turned on by default with value 5)
                                  specify N=0 to disable.
     --listen-queue-size=N        allow for N waiting connections to our socket
     --x-greylist-header=TXT      header when a mail was delayed by greylisting
                                  default: X-Greylist: delayed <seconds> seconds by postgrey-<version> at <server>; <date>

Note that the --whitelist-x options can be specified multiple times,
 and that per default /etc/postfix/postgrey_whitelist_clients.local is
 also read, so that you can put there local entries.

=head1 DESCRIPTION

Postgrey is a Postfix policy server implementing greylisting.

When a request for delivery of a mail is received by Postfix via SMTP, the
triplet C<CLIENT_IP> / C<SENDER> / C<RECIPIENT> is built. If it is the first
time that this triplet is seen, or if the triplet was first seen less than
I<delay> seconds (300 is the default), then the mail gets rejected with a
temporary error. Hopefully spammers or viruses will not try again later, as it
is however required per RFC.

Note that you shouldn't use the --lookup-by-host option unless you know what
you are doing: there are a lot of mail servers that use a pool of addresses to
send emails, so that they can change IP every time they try again. That's why
without this option postgrey will strip the last byte of the IP address when
doing lookups in the database.

=head2 Installation

=over 4

=item *

Create a C<postgrey> user and the directory where to put the database I<dbdir>
(default: C</var/spool/postfix/postgrey>)

=item *

Write an init script to start postgrey at boot and start it. Like this for example:

postgrey --inet=10023 -d

F<contrib/postgrey.init> in the postgrey source distribution includes a
LSB-compliant init script by Adrian von Bidder for the Debian system.

=item *

Put something like this in /etc/main.cf:

smtpd_recipient_restrictions =
               permit_mynetworks
               ...
               reject_unauth_destination
               check_policy_service inet:127.0.0.1:10023

=item *

Install the provided postgrey_whitelist_clients and
postgrey_whitelist_recipients in /etc/postfix.

=item *

Put in /etc/postfix/postgrey_whitelist_recipients users that do not want
greylisting.

=back

=head2 Whitelists

Whitelists allow you to specify client addresses or recipient address, for
which no greylisting should be done. Per default postgrey will read the
following files:

/etc/postfix/postgrey_whitelist_clients
 /etc/postfix/postgrey_whitelist_clients.local
 /etc/postfix/postgrey_whitelist_recipients

You can specify alternative paths with the --whitelist-x options.

Postgrey whitelists follow similar syntax rules as Postfix access tables.
The following can be specified for B<recipient addresses>:

=over 10

=item domain.addr

C<domain.addr> domain and subdomains.

=item name@

C<name@.*> and extended addresses C<name+blabla@.*>.

=item name@domain.addr

C<name@domain.addr> and extended addresses.

=item /regexp/

anything that matches C<regexp> (the full address is matched).

=back

The following can be specified for B<client addresses>:

=over 10

=item domain.addr

C<domain.addr> domain and subdomains.

=item IP1.IP2.IP3.IP4

IP address IP1.IP2.IP3.IP4. You can also leave off one number, in
which case only the first specified numbers will be checked.

=item IP1.IP2.IP3.IP4/MASK

CIDR-syle network. Example: 192.168.1.0/24

=item /regexp/

anything that matches C<regexp> (the full address is matched).

=back

=head2 Auto-whitelisting clients

With the option --auto-whitelist-clients a client IP address will be
automatically whitelisted if the following conditions are met:

=over 4

=item *

At least 5 successfull attempts of delivering a mail (after greylisting was
done). That number can be changed by specifying a number after the
--auto-whitelist-clients argument. Only one attempt per hour counts.

=item *

The client was last seen before --max-age days (35 per default).

=back

=head2 Greylist Action

To set the action to be returned to postfix when a message fails
postgrey's tests and should be deferred, use the
--greylist-action=ACTION option.

By default, postgrey returns DEFER_IF_PERMIT, which causes postfix to
check the rest of the restrictions and defer the message only if it
would otherwise be accepted.  A delay action of 451 causes postfix to
always defer the message with an SMTP reply code of 451 (temp fail).

See the postfix manual page access(5) for a discussion of the actions
allowed.

=head2 Greylist Text

When a message is greylisted, an error message like this will be sent at the
SMTP-level:

Greylisted, see http://postgrey.schweikert.ch/help/example.com.html

Usually no user should see that error message and the idea of that URL is to
provide some help to system administrators seeing that message or users of
broken mail clients which try to send mails directly and get a greylisting
error. Note that the default help-URL contains the original recipient domain
(example.com), so that domain-specific help can be presented to the user (on
the default page it is said to contact postmaster@example.com)

You can change the text (and URL) with the B<--greylist-text> parameter. The
following special variables will be replaced in the text:

=over 4

=item %s

How many seconds left until the greylisting is over (300).

=item %r

Mail-domain of the recipient (example.com).

=back

=head2 Greylist Header

When a message is greylisted, an additional header can be prepended to the
header section of the mail:

X-Greylist: delayed %t seconds by postgrey-%v at %h; %d

You can change the text with the B<--x-greylist-header> parameter. The
following special variables will be replaced in the text:

=over 4

=item %t

How many seconds the mail has been delayed due to greylisting.

=item %v

The version of postgrey.

=item %d

The date.

=item %h

The host.

=back

=head2 Privacy

The --privacy option enable the use of a SHA1 hash function to store
IPs and emails in the greylisting database.  This will defeat straight
forward attempts to retrieve mail user behaviours.

=head2 SEE ALSO

See L<http://www.greylisting.org/> for a description of what
greylisting is and L<http://www.postfix.org/SMTPD_POLICY_README.html>
for a description of how Postfix policy servers work.

=head1 COPYRIGHT

=head1 LICENSE

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

=head1 AUTHOR

S<David Schweikert E<lt>david@schweikert.chE<gt>>

=cut

# vi: sw=4 et

${this.title}

Code Editor : postgrey