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dbclean(8) Distributed Checksum Clearinghouse dbclean(8)
NNAAMMEE
ddbbcclleeaann -- Clean Distributed Checksum Clearinghouse Database
SSYYNNOOPPSSIISS
ddbbcclleeaann [--ddDDffFFNNRRPPSSVVqq] [--ii _i_d] [--aa [_s_e_r_v_e_r_-_a_d_d_r][_,_p_o_r_t]] [--hh _h_o_m_e_d_i_r]
[--GG _o_n] [--ss _h_a_s_h_-_s_i_z_e] [--ee _s_e_c_o_n_d_s] [--EE _s_p_a_m_s_e_c_s]
[--tt _t_y_p_e_,_a_l_l_s_e_c_s_,_t_h_r_e_s_h_o_l_d_,_b_u_l_k_s_e_c_s] [--LL _l_t_y_p_e_,_f_a_c_i_l_i_t_y_._l_e_v_e_l]
DDEESSCCRRIIPPTTIIOONN
DDbbcclleeaann creates empty, rebuilds corrupted, and deletes or expires old
reports of checksums from DCC databases. It should be installed where it
will be found with the path given the DCC server daemon when the daemon
needs to expand the hash table. See dccd(8). It should also be run by
cron(8) approximately daily.
If the hash table in the database has been damaged, ddbbcclleeaann tries to
repair the database.
The contents of the _w_h_i_t_e_l_i_s_t file are built into the DCC server's data-
base. Changes to the whitelist are not effective until dbclean is run to
expire reports. White or blacklists can also be used by DCC clients, and
generally work better there.
OOPPTTIIOONNSS
The following options are available:
--dd enables debugging output. Additional --dd options increase the number
of messages.
--DD indicates that dccd(8) started ddbbcclleeaann.
--FF uses read() and write() instead of mmap() in some cases to access
the DCC database. This works better on some versions of Solaris
provided the entire DCC database fits in RAM and provided the file
system has not been tuned for the large, random accesses of a DCC
database. It is the default on Solaris.
--ff turns off --FF.
--NN creates a new, empty database. There must not be an existing data-
base and the DCC server, dccd(8), must not be running.
--RR repairs a database.
--PP expires old checksums from a database using the --ee, --EE, and --tt val-
ues from the preceding use of ddbbcclleeaann. --PP cannot be used with --ee,
--EE, or --tt. Note also that using --PP differs from not using --ee --EE or
--tt, because in the absence of all four, their default values are
used.
--SS says that the DCC server, dccd(8), is not running and so ddbbcclleeaann
should run stand-alone and not try to tell the DCC server about
changes to the database. --ii is not needed when --SS is present.
--VV displays the version of the DCC database cleaner.
--qq quiets the announcement of results at the end.
--ii _i_d
specifies the DCC ID recognized by the local DCC server as its own.
This ID allows the DCC server to recognize commands from ddbbcclleeaann to
stop using the database while it is being cleaned.
--aa [_s_e_r_v_e_r_-_a_d_d_r][_,_p_o_r_t]
is commonly used to specify a UDP port or IP address of the local
server other than the default.
--hh _h_o_m_e_d_i_r
overrides the default DCC home directory, which is often /var/dcc.
--GG _o_n
cleans a greylist database.
--ss _h_a_s_h_-_s_i_z_e
specifies a size for the hash table. By default the hash table is
rebuilt to be approximately 80% full based on an estimate of the
number of distinct checksums in the main file.
--ee _s_e_c_o_n_d_s
specifies that reports older than _s_e_c_o_n_d_s and with totals below
their --tt thresholds should be deleted. Reports older than _s_e_c_o_n_d_s
of checksums that have been reported more recently are summarized in
the database. The default value is 2 days or the value of --EE,
whichever is smaller. The 2 day default is reduced if the system
does not appear to have enough RAM to hold the database. The mini-
mum is 1 hour. _S_e_c_o_n_d_s can also be _N_E_V_E_R or a number of hours,
days, or weeks followed by _H_O_U_R_S, _H, _D_A_Y_S, _D, _W_E_E_K_S or _W.
DCC servers that are not very busy and are isolated or do not
receive "floods" of checksums from busy servers should use longer
values to increase their chances of recognizing bulk mail.
--EE _s_p_a_m_s_e_c_s
changes the expiration of checksums exceding --tt thresholds from the
default of 30 days or the explicit value of --ee, whichever is larger.
The 30 day default is reduced if the system does not have enough RAM
to hold the database. _S_p_a_m_s_e_c_s can also be _N_E_V_E_R or a number of
hours, days, or weeks followed by _H_O_U_R_S, _H, _D_A_Y_S, _D, _W_E_E_K_S or _W.
--tt _t_y_p_e_,_a_l_l_s_e_c_s[_,_t_h_r_e_s_h_o_l_d_,_b_u_l_k_s_e_c_s]
overrides the global --ee setting and specifies that reports of check-
sums of _t_y_p_e with total counts of at least _t_h_r_e_s_h_o_l_d should be kept
for _b_u_l_k_s_e_c_s seconds. All reports should be kept for the shorter
duration, _a_l_l_s_e_c_s seconds. The threshold is either a number or the
string _M_A_N_Y indicating millions of targets. By default ddbbcclleeaann acts
as if given --tt _F_u_z_1_,_s_e_c_o_n_d_s_,_2_0_,_s_p_a_m_s_e_c_s --tt _F_u_z_2_,_s_e_c_o_n_d_s_,_2_0_,_s_p_a_m_s_e_c_s,
where _s_e_c_o_n_d_s is the value for --ee and _s_p_a_m_s_e_c_s is the value for --EE.
All other checksum types act as if --tt _t_y_p_e_,_s_e_c_o_n_d_s were specified.
_A_l_l_s_e_c_s and _b_u_l_k_s_e_c_s can also be _N_E_V_E_R or a number of hours, days,
or weeks followed by _H_O_U_R_S, _H, _D_A_Y_S, _D, _W_E_E_K_S or _W.
--LL _l_t_y_p_e_,_f_a_c_i_l_i_t_y_._l_e_v_e_l
specifies how messages should be logged. _L_t_y_p_e must be _e_r_r_o_r or
_i_n_f_o to indicate which of the two types of messages are being con-
trolled. _L_e_v_e_l must be a syslog(3) level among _E_M_E_R_G, _A_L_E_R_T,
_C_R_I_T, _E_R_R, _W_A_R_N_I_N_G, _N_O_T_I_C_E, _I_N_F_O, and _D_E_B_U_G. _F_a_c_i_l_i_t_y must be among
_A_U_T_H, _A_U_T_H_P_R_I_V, _C_R_O_N, _D_A_E_M_O_N, _F_T_P, _K_E_R_N, _L_P_R, _M_A_I_L, _N_E_W_S, _U_S_E_R,
_U_U_C_P, and _L_O_C_A_L_0 through _L_O_C_A_L_7. The default is equivalent to
-L info,MAIL.NOTICE -L error,MAIL.ERR
ddbbcclleeaann exits 0 on success, and > 0 if an error occurs.
FFIILLEESS
/var/dcc is the DCC home directory containing data and control
files.
dcc_db is the main file containing mail checksums.
dcc_db.hash mail checksum database hash table.
grey_db is the database of greylist checksums.
grey_db.hash is the greylist database hash table.
dcc_db-new, dcc_db-new.hash, grey_db-new, grey_db-new.hash
new database and hash files until they are renamed.
dcc_db-old, grey_db-old
previous database files.
ids list of IDs and passwords, as described in dccd(8).
whitelist contains the DCC server whitelist in the format described
in dcc(8).
grey_whitelist
contains the greylist server whitelist.
SSEEEE AALLSSOO
cdcc(8), cron(8), dcc(8), dccd(8), dblist(8), dccifd(8), dccm(8),
dccproc(8).
HHIISSTTOORRYY
Implementation of ddbbcclleeaann was started at Rhyolite Software in 2000. This
describes version 1.2.74.
FreeBSD 4.9 March 20, 2005 FreeBSD 4.9
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