3proxy/doc/html/man5/3proxy.cfg.5.html

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<h1 align="center">3proxy.cfg</h1>

<a href="#NAME">NAME</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#PLUGINS">PLUGINS</a><br>
<a href="#SSL/TLS SUPPORT">SSL/TLS SUPPORT</a><br>
<a href="#MITM Commands">MITM Commands</a><br>
<a href="#Server TLS Commands">Server TLS Commands</a><br>
<a href="#Client TLS Commands">Client TLS Commands</a><br>
<a href="#SSL Parameters">SSL Parameters</a><br>
<a href="#PCRE FILTERING">PCRE FILTERING</a><br>
<a href="#PCRE Commands">PCRE Commands</a><br>
<a href="#PCRE Parameters">PCRE Parameters</a><br>
<a href="#BUGS">BUGS</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<a href="#AUTHORS">AUTHORS</a><br>

<hr>


<h2>NAME
<a name="NAME"></a>
</h2>



<p style="margin-left:6%; margin-top: 1em"><b>3proxy.cfg</b>
3proxy configuration file</p>

<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>


<p style="margin-left:6%; margin-top: 1em">Common
structure: <br>
Configuration file is a text file 3proxy reads configuration
from. Each line of the file is a command executed
immediately, as if it were given from the console. The
sequence of commands is important. The configuration file is
actually a script for the 3proxy executable. Each line of
the file is treated as a blank (space or tab) separated
command line. Additional space characters are ignored. Think
about 3proxy as &quot;application level router&quot; with
console interface.</p>

<p style="margin-left:6%; margin-top: 1em">Comments: <br>
Any line beginning with a space character or &acute;#&acute;
character is a comment. It&acute;s ignored. &lt;LF&gt;s are
ignored. &lt;CR&gt; is the end of a command.</p>

<p style="margin-left:6%; margin-top: 1em">Quotation: <br>
The quotation character is &quot; (double quote). Quotation
must be used to quote spaces or other special characters. To
use a quotation character inside a quoted string, the
character must be doubled (BASIC convention). For example,
to use HELLO &quot;WORLD&quot; as an argument, you should
write it as &quot;HELLO &quot;&quot;WORLD&quot;&quot;&quot;.
Good practice is to quote any argument you use.</p>

<p style="margin-left:6%; margin-top: 1em">File inclusion:
<br>
You can include file by using $FILENAME macro (replace
FILENAME with a path to file, for example
$/usr/local/etc/3proxy/conf.incl or <br>
$&quot;c:\\Program Files\3proxy\include.cfg&quot; Quotation
is required in last example because path contains space
character. For included file &lt;CR&gt; (end of line
characters) is treated as space character (arguments
delimiter instead of end of command delimiter). Thus,
include files are only useful to store long single-line
commands (like userlist, network lists, etc). To use dollar
sign somewhere in argument it must be quoted. Recursion is
not allowed.</p>

<p style="margin-left:6%; margin-top: 1em">Next commands
start gateway services:</p>

<p style="margin-left:6%; margin-top: 1em"><b>proxy</b>
[options] <b><br>
socks</b> [options] <b><br>
pop3p</b> [options] <b><br>
imapp</b> [options] <b><br>
smtpp</b> [options] <b><br>
ftppr</b> [options] <b><br>
admin</b> [options] <b><br>
dnspr</b> [options] <b><br>
tcppm</b> [options] <i>&lt;SRCPORT&gt; &lt;DSTADDR&gt;
&lt;DSTPORT&gt;</i> <b><br>
udppm</b> [options] <i>&lt;SRCPORT&gt; &lt;DSTADDR&gt;
&lt;DSTPORT&gt;</i> <br>
Descriptions: <b><br>
proxy</b> HTTP/HTTPS proxy (default port 3128) <b><br>
socks</b> SOCKS 4/4.5/5 proxy (default port 1080) <b><br>
tlspr</b> SNI proxy (destination address is taken from TLS
handshake), may be used to redirect any TLS-based traffic
<b><br>
auto</b> Proxy with protocol autoselection between proxy /
socks / tlspr <b><br>
pop3p</b> POP3 proxy (default port 110) <b><br>
imapp</b> IMAPv4 proxy (default port 143) <b><br>
smtpp</b> SMTP proxy (default port 25) <b><br>
ftppr</b> FTP proxy (default port 21) <b><br>
admin</b> Web interface (default port 80) <b><br>
dnspr</b> caching DNS proxy (default port 53) <b><br>
tcppm</b> TCP portmapper. Destination address (DSTADDR) can
be a Unix domain socket using the syntax
<i>unix:/path/to/socket</i> (e.g., tcppm 8080
unix:/var/run/app.sock 0). On Linux, abstract sockets use
<i>unix:@socketname</i> syntax. When using Unix socket
destination, the port number is ignored but must be
specified for syntax compatibility. <b><br>
udppm</b> UDP portmapper</p>

<p style="margin-left:6%; margin-top: 1em">Options: <b><br>
-p</b><i>NUMBER</i> change default server port to NUMBER
<b><br>
-6</b> Only resolve IPv6 addresses. IPv4 addresses are
packed in IPv6 in IPV6_V6ONLY compatible way. <b><br>
-4</b> Only resolve IPv4 addresses <b><br>
-46</b> Prefer IPv4. Resolve IPv6 addresses if IPv4 address
is not resolvable <b><br>
-64</b> Prefer IPv6. Resolve IPv4 addresses if IPv6 address
is not resolvable <b><br>
-e</b> External address. IP address of the interface the
proxy should initiate connections from. External IP must be
specified if you need incoming connections. By default the
system will decide which address to use in accordance with
the routing table. <b><br>
-i</b> Internal address. IP address the proxy accepts
connections to. By default, connections to any interface are
accepted. Unix domain sockets can be specified with
<i>-iunix:/path/to/socket</i> syntax. On Linux, abstract
sockets use <i>-iunix:@socketname</i> syntax. <b><br>
-Di</b><i>INTERFACE</i><b>, -De</b><i>INTERFACE</i> bind
internal (<b>-Di</b>) / external (<b>-De</b>) interface to
given INTERFACE (e.g. eth0) if <b>SO_BINDTODEVICE</b> is
supported by the system. You may need to run as root or have
<b>CAP_NET_RAW</b> capability in order to bind to an
interface, depending on the system, so this option may
require root privileges and can be incompatible with some
configuration commands like <b>chroot</b> and <b>setuid</b>
(and <b>daemon</b> if setcap is used). <b><br>
-ni</b><i>PATH</i><b>, -ne</b><i>PATH</i> (Linux only)
Switch to the network namespace identified by the filesystem
path <i>PATH</i> (e.g. <i>/var/run/netns/myns</i> or
<i>/proc/PID/ns/net</i>) for the listening socket
(<b>-ni</b>) or for outgoing connections (<b>-ne</b>). With
<b>-ni</b> the current namespace is saved before opening the
listening socket and restored immediately after binding, so
that the rest of the process (outgoing connections, child
threads) runs in the original namespace unless <b>-ne</b> is
also given. With <b>-ne</b> the process switches to the
specified namespace after the listening socket is bound (and
after restoring from <b>-ni</b> if applicable). Requires
<b>CAP_SYS_ADMIN</b> (or <b>CAP_NET_ADMIN</b> on recent
kernels) and is incompatible with
<b>chroot</b>/<b>setuid</b>/<b>daemon</b> if privileges are
dropped before the switch takes effect. <b><br>
-Ne</b> (for socks) External NAT address (between 3proxy and
destination server) to report to client for CONNECT and
BIND. By default external address is reported. It&rsquo;s
only useful in the case of IP-IP NAT (will not work for
PAT). <b><br>
-Ni</b> (for socks) Internal NAT address (between client and
3proxy) to report to client for UDPASSOC. By default
internal address is reported. It&rsquo;s only useful in the
case of IP-IP NAT (will not work for PAT). <b><br>
-R</b><i>HOST</i><b>:</b><i>port</i> listen on given local
HOST:port for incoming connections instead of making remote
outgoing connection. Can be used with another 3proxy service
running -r option for connect back functionality. Most
commonly used with tcppm. HOST can be given as IP or
hostname, useful in case of dynamic DNS. <b><br>
-r</b><i>HOST</i><b>:</b><i>port</i> connect to given remote
HOST:port instead of listening local connection on -p or
default port. Can be used with another 3proxy service
running -R option for connect back functionality. Most
commonly used with proxy or socks. HOST can be given as IP
or hostname, useful in case of dynamic DNS. <b><br>
-oc</b><i>OPTIONS</i><b>, -os</b><i>OPTIONS</i><b>,
-ol</b><i>OPTIONS</i><b>, -or</b><i>OPTIONS</i><b>,
-oR</b><i>OPTIONS</i> options for proxy-to-client
(<b>-oc</b>), proxy-to-server (<b>-os</b>), proxy listening
(<b>-ol</b>), connect back client (<b>-or</b>), connect back
listening (<b>-oR</b>) sockets. Options like TCP_CORK,
TCP_NODELAY, TCP_DEFER_ACCEPT, TCP_QUICKACK, TCP_TIMESTAMPS,
TCP_FASTOPEN, SO_REUSEADDR, SO_REUSEPORT,
SO_EXCLUSIVEADDRUSE, SO_PORT_SCALABILITY,
SO_REUSE_UNICASTPORT, SO_KEEPALIVE, SO_DONTROUTE may be
supported depending on OS. SO_REUSEADDR and SO_REUSEPORT are
set on the listening socket by default on Unix. On Windows
SO_REUSEADDR is not set: it is not required to rebind a
listening port and it only lets another local process bind
the same address and port. Use SO_EXCLUSIVEADDRUSE (Windows)
on the listening socket (<b>-ol</b>) to prevent that.
<b><br>
-H</b> (for all services) Expect HAProxy PROXY protocol v1
header on incoming connection. This allows the proxy to
receive real client IP address from HAProxy or other load
balancer that supports the PROXY protocol. The header must
be sent before any protocol-specific data. <b><br>

-g(</b><i>GRACE_TRAFF</i><b>,</b><i>GRACE_NUM</i><b>,</b><i>GRACE_DELAY</i>)
delay GRACE_DELAY milliseconds before polling if average
polling size is below GRACE_TRAFF bytes and GRACE_NUM read
operations in a single direction are detected within 1
second. Useful to minimize polling <b><br>
-s</b> <br>
(for admin) secure, allow only secure operations, currently
only traffic counters view without ability to reset. <br>
(for TCP services, Linux) enable splice(). It is built on
Linux by default, but off unless -s is given: splice() is
faster for large transfers and the read/write path for small
requests. -s0 disables it explicitly; build without
-DWITHSPLICE to leave it out. <b><br>
-C</b> <br>
(for TCP services) a connection closed by any of the sides
terminates the session, buffered data is delivered before
the sockets are closed. By default the session is kept until
both sides close the connection (TCP half-close). Half-close
is required for the protocols where one of the sides closes
its sending side and expects the answer, but it keeps the
socket of the side which has already closed the connection
in CLOSE_WAIT state. Use -C to close both sockets as soon as
any of the sides closes the connection, -C1 to request the
default behaviour explicitly. <b><br>
-U</b><i>[MODE]</i> <br>
(for socks) what to do when the destination changes within
an UDP association: <b>1</b> - log it, <b>2</b> - authorize
it, <b>3</b> - both, the default, <b>0</b> (same as bare
<b>-U</b>) - neither. The destination of the first datagram
is always authorized and logged. With <b>-U0</b> and
<b>-U1</b> the destination is not authorized again, so ACLs
limiting the destination only apply to the first destination
of the association, and the parent proxy and the external
address selected for it are kept for the whole association.
Use <b>-U2</b> to keep the authorization and to drop the
per-destination log records only. <br>
(for dnspr) simple, do not use resolver and 3proxy cache,
always use external DNS server. <br>
(for udppm) singlepacket, expect only one packet from both
client and server <b><br>
-u</b> Never ask for username/password <b><br>
-u2</b> (for socks) require username/password in
authentication methods <b><br>
-a</b> (for proxy) anonymous proxy (no information about
client reported) <b><br>
-a1</b> (for proxy) anonymous proxy (random client
information reported) <b><br>
-a2</b> (for proxy) generate Via: and X-Forwarded-For:
instead of Forwarded: <br>
Also, all options mentioned for <b>proxy</b>(8)
<b>socks</b>(8) <b>pop3p</b>(8) <b>imapp</b>(8)
<b>tcppm</b>(8) <b>udppm</b>(8) <b>ftppr</b>(8) <br>
are also supported. <br>
Portmapping services listen at SRCPORT and connect to
DSTADDR:DSTPORT HTTP and SOCKS proxies are standard. <br>
POP3 proxy must be configured as POP3 server and requires
username in the form of: pop3username@pop3server. If POP3
proxy access must be authenticated, you can specify username
as proxy_username:proxy_password:POP3_username@pop3server
<br>
DNS proxy resolves any types of records but only hostnames
are cached. It requires <b>nserver</b>/<b>nscache</b> to be
configured. If <b>nserver</b> is configured as TCP,
redirections are applied on connection, so parent proxy may
be used to resolve names to IP. <br>
FTP proxy can be used as FTP server in any FTP client or
configured as FTP proxy on a client with FTP proxy support.
Username format is one of <br>
FTPuser@FTPServer <br>
FTPuser:FTPpassword@FTPserver <br>
proxyuser:proxypassword:FTPuser:FTPpassword@FTPserver <br>
Please note, if you use FTP client interface for FTP proxy
do not add FTPpassword and FTPServer to username, because
FTP client does it for you. That is, if you use 3proxy with
authentication use proxyuser:proxypassword:FTPuser as FTP
username, otherwise do not change original FTP user name</p>

<p style="margin-left:6%; margin-top: 1em"><b>include</b>
<i>&lt;path&gt;</i> <br>
Include config file</p>

<p style="margin-left:6%; margin-top: 1em"><b>config</b>
<i>&lt;path&gt;</i> <br>
Path to configuration file to use on 3proxy restart or to
save configuration.</p>

<p style="margin-left:6%; margin-top: 1em"><b>writable</b>
<br>
ReOpens configuration file for write access via Web
interface, and rereads it. Usually should be first command
on config file but in combination with config it can be used
anywhere to open alternate config file. Think twice before
using it.</p>

<p style="margin-left:6%; margin-top: 1em"><b>end</b> <br>
End of configuration</p>

<p style="margin-left:6%; margin-top: 1em"><b>log</b>
[[@|&amp;]<i>logfile</i>] [<i>&lt;LOGTYPE&gt;</i>] <br>
sets logfile for all gateways <br>
@ (for Unix) use syslog, filename is used as ident name <br>
&amp; use ODBC, filename consists of comma-delimited
datasource,username,password (username and password are
optional) <br>
radius - use RADIUS for logging <br>
LOGTYPE is one of: <b><br>
c</b> Minutely <b><br>
H</b> Hourly <b><br>
D</b> Daily <b><br>
W</b> Weekly (starting from Sunday) <b><br>
M</b> Monthly <b><br>
Y</b> Annually <br>
if logfile is not specified logging goes to stdout. You can
specify individual logging options for gateway by using -l
option in gateway configuration. <br>
log command supports same format specifications for filename
template as &quot;logformat&quot; (if filename contains
&acute;%&acute; sign it&acute;s believed to be template). As
with &quot;logformat&quot; filename must begin with
&acute;L&acute; or &acute;G&acute; to specify Local or
Grinwitch time zone for all time-based format
specificators.</p>

<p style="margin-left:6%; margin-top: 1em"><b>rotate</b>
<i>&lt;n&gt;</i> <br>
how many archived log files to keep</p>


<p style="margin-left:6%; margin-top: 1em"><b>logformat</b>
<i>&lt;format&gt;</i> <br>
Format for log record. First symbol in format must be L
(local time) or G (absolute Grinwitch time). It can be
preceeded with -XXX+Y where XXX is list of characters to be
filtered in user input (any non-printable characters are
filtered too in this case) and Y is replacement character.
For example, &quot;-,%+ L&quot; in the beginning of
logformat means comma and percent are replaced with space
and all time based elemnts are in local time zone. <br>
You can use:</p>

<p style="margin-left:6%; margin-top: 1em">%y Year in 2
digit format <br>
%Y Year in 4 digit format <br>
%m Month number <br>
%o Month abbreviation <br>
%d Day <br>
%H Hour <br>
%M Minute <br>
%S Second <br>
%t Timestamp (in seconds since 01-Jan-1970) <br>
%. milliseconds <br>
%z time zone (from Greenwich) <br>
%D request duration (in milliseconds) <br>
%b average send rate per request (in bytes per second); this
speed is typically below the connection speed shown by the
download manager. <br>
%B average receive rate per request (in bytes per second);
this speed is typically below the connection speed shown by
the download manager. <br>
%U Username <br>
%N service Name <br>
%p service Port <br>
%E Error code <br>
%C Client IP <br>
%c Client port <br>
%R Remote IP <br>
%r Remote port <br>
%i Internal IP used to accept client connection <br>
%e External IP used to establish connection <br>
%Q Requested IP <br>
%q Requested port <br>
%n requested hostname <br>
%I bytes In <br>
%O bytes Out <br>
%h Hops (redirections) count <br>
%T service specific Text <br>
%N1-N2T (N1 and N2 are positive numbers) log only fields
from N1 through N2 of service-specific text <br>
In the case of ODBC logging, logformat specifies an SQL
statement, for example: <br>
logformat &quot;-&acute;+_Linsert into log (l_date, l_user,
l_service, l_in, l_out, l_descr) values (&acute;%d-%m-%Y
%H:%M:%S&acute;, &acute;%U&acute;, &acute;%N&acute;, %I, %O,
&acute;%T&acute;)&quot;</p>

<p style="margin-left:6%; margin-top: 1em"><b>logdump</b>
<i>&lt;in_traffic_limit&gt; &lt;out_traffic_limit&gt;</i>
<br>
Immediately creates additional log records if given amount
of incoming/outgoing traffic is achieved for connection,
without waiting for connection to finish. It may be useful
to prevent information about long-lasting downloads on
server shutdown.</p>


<p style="margin-left:6%; margin-top: 1em"><b>delimchar</b>
<i>&lt;char&gt;</i> <br>
Sets the delimiter character used to separate username from
hostname in proxy authentication strings (e.g. for FTP, POP3
proxies). Default is &acute;@&acute;. For example, to use
&acute;#&acute; instead: delimchar #. This allows usernames
to contain the &acute;@&acute; character.</p>

<p style="margin-left:6%; margin-top: 1em"><b>archiver</b>
<i>&lt;ext&gt; &lt;commandline&gt;</i> <br>
Archiver to use for log files. &lt;ext&gt; is file extension
produced by archiver. Filename will be last argument to
archiver, optionally you can use %A as produced archive name
and %F as filename.</p>

<p style="margin-left:6%; margin-top: 1em"><b>timeouts</b>
<i>&lt;BYTE_SHORT&gt; &lt;BYTE_LONG&gt; &lt;STRING_SHORT&gt;
&lt;STRING_LONG&gt; &lt;CONNECTION_SHORT&gt;
&lt;CONNECTION_LONG&gt; &lt;DNS&gt; &lt;CHAIN&gt;
&lt;CONNECT&gt; &lt;CONNECTBACK&gt; &lt;LINGER&gt;</i> <br>
Sets timeout values, defaults 1, 5, 30, 60, 180, 1800, 15,
60, 15, 5, 5. <b><br>
BYTE_SHORT</b> short timeout for single byte, is usually
used for receiving single byte from stream. <b><br>
BYTE_LONG</b> long timeout for single byte, is usually used
for receiving first byte in frame (for example first byte in
socks request). <b><br>
STRING_SHORT</b> short timeout, for character string within
stream (for example to wait between 2 HTTP headers) <b><br>
STRING_LONG</b> long timeout, for first string in stream
(for example to wait for HTTP request). <b><br>
CONNECTION_SHORT</b> inactivity timeout for short
connections (HTTP, POP3, etc). <b><br>
CONNECTION_LONG</b> inactivity timeout for long connection
(SOCKS, portmappers, etc). <b><br>
DNS</b> timeout for DNS request before requesting next
server <b><br>
CHAIN</b> timeout for reading data from chained connection
<b><br>
LINGER</b> timeout to deliver buffered data after one of the
sides has closed its sending side, also used as SO_LINGER
value on outgoing connections. Too small value may cause the
tail of the data to be lost on slow connections, too large
one delays release of the sockets. <br>
default timeouts 1 5 30 60 180 1800 15 60 15 5 5</p>

<p style="margin-left:6%; margin-top: 1em"><b>maxseg</b>
<i>&lt;value&gt;</i> <br>
Sets TCP maximum segment size (MSS) for outgoing
connections. This can be used to work around path MTU
discovery issues or to optimize traffic for specific network
conditions.</p>

<p style="margin-left:6%; margin-top: 1em"><b>radius</b>
<i>&lt;NAS_SECRET&gt;
&lt;radius_server_1</i>[:<i>port</i>][/<i>local_address_1</i>]
<i>&lt;radius_server_2</i>[:<i>port</i>][/<i>local_address_2</i>]
<br>
Configures RADIUS servers to be used for logging and
authentication (log and auth types must be set to radius).
port and local address to use with given server may be
specified. <br>
Attributes within request: User-Name, Password: (username
and password if presented by client), Service Type:
Authenticate-Only, NAS-Port-Type: NAS-Port-Virtual,
NAS-Port-ID: (proxy service port, e.g. 1080),
NAS-IPv6-Address / NAS-IP-Address: (proxy interface accessed
by client), NAS-Identifier: (text identifing proxy, e.g.
PROXY or SOCKSv5), Framed-IPv6-Address / Framed-IP-Address:
(IP address of the client), Called-Station-ID: (requested
Hostname, if presents), Login-Service: (type of request,
e.g. 1001 - SOCKS CONNECT, 1010 - HTTP GET, 1013 - HTTP
CONNECT), Login-TCP-Port: (requested port), Login-IPv6-Host
/ Login-IP-Host: (requested IP). <br>
Supported reply attributes for authentication:
Framed-IP-Address / Framed-IPv6-Address (IP to assign to
user), Reply-Message. Use <b>authcache</b> to speedup
authentication. RADIUS feature is currently
experimental.</p>

<p style="margin-left:6%; margin-top: 1em"><b>nserver</b>
<i>&lt;ipaddr&gt;</i>[:<i>port</i>][/<i>tcp</i>] <br>
Nameserver to use for name resolutions. If none specified
system routines for name resolution is used. Optional port
number may be specified. If optional /tcp is added to IP
address, name resolution is performed over TCP. An IPv6 address
has to be enclosed in square brackets: <br>
<b>nserver 1.1.1.1</b> <br>
<b>nserver [2001:4860:4860::8844]</b> <br>
<b>nserver [2001:4860:4860::8844]:5353/tcp</b></p>


<p style="margin-left:6%; margin-top: 1em"><b>authnserver</b>
<i>&lt;ipaddr&gt;</i>[:<i>port</i>][/<i>tcp</i>] <br>
Nameserver to use for DNS-based authentication (e.g. dnsname
auth type). If not specified, nserver is used. The syntax is
the same as for nserver.</p>

<p style="margin-left:6%; margin-top: 1em"><b>nscache</b>
<i>&lt;cachesize&gt;</i> <b>nscache6</b>
<i>&lt;cachesize&gt;</i> <br>
Cache <i>&lt;cachesize&gt;</i> records for name resolution
(<b>nscache</b> for IPv4, <b>nscache6</b> for IPv6). The
cache size should usually be large enough (for example,
65536).</p>

<p style="margin-left:6%; margin-top: 1em"><b>nsrecord</b>
<i>&lt;hostname&gt; &lt;hostaddr&gt;</i> <br>
Adds static record to nscache. <b>nscache</b> must be
enabled. If 0.0.0.0 is used as a hostaddr host will never
resolve, it can be used to blacklist something or together
with <b>dialer</b> command to set up UDL for dialing.</p>


<p style="margin-left:6%; margin-top: 1em"><b>fakeresolve</b>
<br>
All names are resolved to the 127.0.0.2 address. Useful if
all requests are redirected to a parent proxy with
<b>http</b>, <b>socks4+</b>, <b>connect+</b> or
<b>socks5+</b>.</p>

<p style="margin-left:6%; margin-top: 1em"><b>dialer</b>
<i>&lt;progname&gt;</i> <br>
Execute progname if external name can&acute;t be resolved.
Hint: if you use nscache, dialer may not work, because names
will be resolved through cache. In this case you can use
something like http://dial.right.now/ from browser to set up
connection.</p>

<p style="margin-left:6%; margin-top: 1em"><b>internal</b>
<i>&lt;ipaddr&gt;</i> <br>
sets ip address of internal interface. This IP address will
be used to bind gateways. Alternatively you can use -i
option for individual gateways. Since 0.8 version, IPv6
address may be used. <br>
Unix domain sockets are supported with the syntax
<i>unix:/path/to/socket</i> (e.g., internal
unix:/var/run/3proxy.sock). On Linux, abstract (fileless)
Unix sockets are supported with the syntax
<i>unix:@socketname</i> (e.g., internal unix:@3proxy). When
using Unix sockets, the socket file is automatically created
and removed on service start/stop.</p>

<p style="margin-left:6%; margin-top: 1em"><b>external</b>
<i>&lt;ipaddr&gt;</i> <br>
sets ip address of external interface. This IP address will
be source address for all connections made by proxy.
Alternatively you can use -e option to specify individual
address for gateway. Since 0.8 version External or <b>-e</b>
can be given twice: once with IPv4 and once with IPv6
address.</p>

<p style="margin-left:6%; margin-top: 1em"><b>maxconn</b>
<i>&lt;number&gt;</i> <br>
sets the maximum number of simultaneous connections to each
service started after this command at the network level.
Default is 100. <br>
To limit clients, use <b>connlim</b> instead. <b>maxconn</b>
will silently ignore new connections, while <b>connlim</b>
will report back to the client that the connection limit has
been reached.</p>

<p style="margin-left:6%; margin-top: 1em"><b>backlog</b>
<br>
sets the listening socket backlog of new connections.
Default is 1 + <b>maxconn</b>/8. Maximum value is capped by
kernel tunable somaxconn.</p>

<p style="margin-left:6%; margin-top: 1em"><b>service</b>
<br>
(deprecated). Indicates that 3proxy should behave as a
Windows 95/98/NT/2000/XP service; has no effect under Unix.
Not required for 3proxy 0.6 and above. If you upgraded from
a previous version of 3proxy, use --remove and --install to
reinstall the service.</p>

<p style="margin-left:6%; margin-top: 1em"><b>daemon</b>
<br>
Should be specified to close the console. Do not use
&acute;daemon&acute; with &acute;service&acute;. At least
under FreeBSD, <b>daemon</b> should precede any proxy
service and log commands to avoid socket problems. Always
place it in the beginning of the configuration file.</p>

<p style="margin-left:6%; margin-top: 1em"><b>auth</b>
<i>&lt;authtype&gt;</i> [...] <br>
Type of user authorization. Currently supported: <b><br>
none</b> - no authentication or authorization required. <br>
Note: if auth is none, any IP-based limitation, redirection,
etc. will not work. This is the default authentication type
<b><br>
iponly</b> - authentication by access control list with
username ignored. <br>
Appropriate for most cases <b><br>
useronly</b> - authentication by username without checking
for any password with authorization by ACLs. Useful for e.g.
SOCKSv4 proxy. <b><br>
dnsname</b> - authentication by DNS hostname with
authorization by ACLs. The DNS hostname is resolved via a
PTR (reverse) record and validated (the resolved name must
resolve to the same IP address). It&acute;s recommended to
use authcache by IP for this authentication. NB: there is no
password check; the name may be spoofed. <b><br>
strong</b> - username/password authentication required. It
will work with SOCKSv5, FTP, POP3 and HTTP proxy. <b><br>
cache</b> - cached authentication, may be used with
&acute;authcache&acute;. <b><br>
cacheacl</b> - cached authentication, same as <b>cache</b>
but the ACL authorization result is also cached and not
re-evaluated on each request. Faster than <b>cache</b>, but
ACL changes do not take effect for cached users until the
cache entry expires. Use <b>cache</b> if ACLs may change
during the cache lifetime. Because the ACL is not walked on
a cache hit, no redirection is applied to a request served
from the cache: it is sent directly instead of through the
<b>parent</b> proxy of the matching ACL entry, with no error
reported. Do not use <b>cacheacl</b> together with parent
proxies, use <b>cache</b> instead. The only redirection type
which survives is <b>extip</b>, and only if <b>ext</b> is a
part of the <b>authcache</b> key, because the external
address is then restored from the cache entry. <b><br>
radius</b> - authentication with RADIUS. <br>
Plugins may add additional authentication types.</p>

<p style="margin-left:6%; margin-top: 1em">It&acute;s
possible to use multiple authentication types in the same
command. E.g. <br>
auth iponly strong <br>
In this case, &acute;strong&acute; authentication will be
used only if resource access cannot be performed with
&acute;iponly&acute; authentication, that is, a username is
required in the ACL. It&acute;s useful to protect access to
some resources with a password while allowing passwordless
access to other resources, or to use IP-based authentication
for dedicated laptops and request a username/password for
shared ones.</p>


<p style="margin-left:6%; margin-top: 1em"><b>authcache</b>
<i>&lt;cachtype&gt; &lt;cachtime&gt; &lt;cachesize&gt;</i>
<br>
Cache authentication information for a given amount of time
(cachetime) in seconds. cachesize limits number of cache
entries. Cachetype is one of: <b><br>
ip</b> - after successful authentication all connections
during caching time from same IP are assigned to the same
user, username is not requested. <b><br>
ip,user</b> username is requested and all connections from
the same IP are assigned to the same user without actual
authentication. <b><br>
user</b> - same as above, but IP is not checked. <b><br>
user,password</b> - both username and password are checked
against cached ones. <b><br>
limit</b> - limit user to use only one ip, &acute;ip&acute;
and &acute;user&acute; are required <b><br>
acl</b> - only use cached auth if user access service with
same ACL <b><br>
ext</b> - cache external IP <b><br>
dstaddr</b> - cache by destination IP address <b><br>
dstport</b> - cache by destination port <b><br>
dsthost</b> - cache by destination hostname <b><br>
dstoper</b> - cache by destination operation (e.g. HTTP
method) <b><br>
srvaddr</b> - cache by service (listener) address <b><br>
srvport</b> - cache by service (listener) port <br>
Multiple types can be combined (e.g.
<b>ip,user,dstaddr,dstport</b>). <br>
With <b>cacheacl</b> the ACL result is not re-evaluated on a
cache hit, so every field the ACL limits must be a part of
the cache key, otherwise the result cached for one request
is applied to a different one: <b>user</b>/<b>pass</b> for
the userlist, <b>ip</b> for the sourcelist,
<b>dstaddr</b>/<b>dsthost</b> for the targetlist,
<b>dstport</b> for the targetportlist and <b>dstoper</b> for
the operationlist. It is especially important for SOCKSv5
UDP traffic, where the destination of every datagram is
authorized: without <b>dstaddr</b> and <b>dstport</b> in the
key the result cached for one destination is applied to any
other destination and the destination is not checked at all,
see <b>allow</b>. <br>
Use auth type <b>cache</b> (or <b>cacheacl</b>) for cached
authentication</p>

<p style="margin-left:6%; margin-top: 1em"><b>allow</b>
<i>&lt;userlist&gt; &lt;sourcelist&gt; &lt;targetlist&gt;
&lt;targetportlist&gt; &lt;operationlist&gt;
&lt;weekdayslist&gt; &lt;timeperiodslist&gt;</i> <b><br>
deny</b> <i>&lt;userlist&gt; &lt;sourcelist&gt;
&lt;targetlist&gt; &lt;targetportlist&gt;
&lt;operationlist&gt; &lt;weekdayslist&gt;
&lt;timeperiodslist&gt;</i> <b><br>
redirect</b> <i>&lt;ip&gt; &lt;port&gt; &lt;userlist&gt;
&lt;sourcelist&gt; &lt;targetlist&gt; &lt;targetportlist&gt;
&lt;operationlist&gt; &lt;weekdayslist&gt;
&lt;timeperiodslist&gt;</i> <br>
Access control entries. All lists are comma-separated, no
spaces are allowed. Usernames are case sensitive (if used
with authtype nbname username must be in uppercase). Source
and target lists may contain IP addresses (W.X.Y.Z), ranges
A.B.C.D - W.X.Y.Z (since 0.8) or CIDRs (W.X.Y.Z/L). Since
0.6, the targetlist may also contain host names, instead of
addresses. It&acute;s possible to use a wildmask in the
beginning and at the end of the hostname, e.g. *badsite.com
or *badcontent*. The hostname is only checked if a hostname
is present in the request. Targetportlist may contain ports
(X) or port ranges lists (X-Y). For any field * sign means
ANY. If access list is empty it&acute;s assumed to be <br>
allow * <br>
If access list is not empty last item in access list is
assumed to be <br>
deny * <br>
You may want explicitly add deny * to the end of access list
to prevent HTTP proxy from requesting user&acute;s password.
Access lists are checked after user have requested any
resource. If you want 3proxy to reject connections from
specific addresses immediately without any conditions you
should either bind proxy to appropriate interface only or to
use ip filters.</p>

<p style="margin-left:6%; margin-top: 1em">Operation is one
of: <b><br>
CONNECT</b> establish outgoing TCP connection <b><br>
BIND</b> bind TCP port for listening <b><br>
UDPASSOC</b> make UDP association <b><br>
ICMPASSOC</b> make ICMP association (for future use) <b><br>
HTTP_GET</b> HTTP GET request <b><br>
HTTP_PUT</b> HTTP PUT request <b><br>
HTTP_POST</b> HTTP POST request <b><br>
HTTP_HEAD</b> HTTP HEAD request <b><br>
HTTP_CONNECT</b> HTTP CONNECT request <b><br>
HTTP_OTHER</b> over HTTP request <b><br>
HTTP</b> matches any HTTP request except HTTP_CONNECT
<b><br>
HTTPS</b> same as HTTP_CONNECT <b><br>
FTP_GET</b> FTP get request <b><br>
FTP_PUT</b> FTP put request <b><br>
FTP_LIST</b> FTP list request <b><br>
FTP_DATA</b> FTP data connection. Note: FTP_DATA requires
access to dynamic non-privileged (1024-65535) ports on the
remote side. <b><br>
FTP</b> matches any FTP/FTP Data request <b><br>
ADMIN</b> access to administration interface</p>

<p style="margin-left:6%; margin-top: 1em">Weekdays are
week day numbers or periods, 0 or 7 means Sunday, 1 is
Monday, 1-5 means Monday through Friday. <br>
Timeperiodlists is a list of time periods in
HH:MM:SS-HH:MM:SS format. For example,
00:00:00-08:00:00,17:00:00-24:00:00 lists non-working hours.
<br>
A SOCKSv5 UDP ASSOCIATE request carries no destination, the
destination of every datagram is taken from the datagram
itself. 3proxy authorizes the destination of every datagram,
so ACLs limiting the destination address, the destination
host name or the destination port do apply to UDP traffic,
unless the <b>-U</b> option of the <b>socks</b> service says
otherwise. <br>
ACLs are only checked for the datagrams sent by the client.
A datagram received on the association is relayed to the
client without an ACL check: with a parent proxy only the
datagrams from the parent are accepted, an association
without a parent accepts a datagram from any source. The
source reported to the client is the actual source of the
datagram. The address in the log record is the destination
the client sent the datagrams to, the source of the
datagrams received on the association is not logged. <br>
A client may use a single association to reach many
destinations. An ACL entry which limits the destination
silently drops the datagrams to every other destination, so
limiting the destination of UDP traffic can break such
clients in a way which is hard to diagnose. Limit it only
when it is really required. <br>
Bandwidth limiters (<b>bandlimin</b>, <b>bandlimout</b>) and
traffic counters (<b>countin</b>, <b>countout</b>) which
limit the destination are selected when the destination is
authorized, so within an UDP association they are selected
for the destination of the first datagram and are not
re-selected for every following destination. They can not be
applied per destination to the incoming UDP traffic at all,
because an incoming datagram is not matched against any
destination. <br>
Only <b>socks5</b> and <b>socks5+</b> parents can be used
for UDP. Because every new destination is authorized, use
<b>authcache</b>, especially with &acute;strong&acute;,
RADIUS or plugin authentication: <b>cacheacl</b> with the
destination in the cache key if no parent proxy is used,
<b>cache</b> otherwise, see <b>cacheacl</b>.</p>

<p style="margin-left:6%; margin-top: 1em"><b>parent</b>
<i>&lt;weight&gt; &lt;type&gt; &lt;ip&gt; &lt;port&gt;
&lt;username&gt; &lt;password&gt;</i> <br>
this command must follow &quot;allow&quot; rule. It extends
last allow rule to build proxy chain. Proxies may be
grouped. Proxy inside the group is selected randomly. If few
groups are specified one proxy is randomly picked from each
group and chain of proxies is created (that is second proxy
connected through first one and so on). Weight is used to
group proxies. Weight is a number between 1 and 1000.
Weights are summed and proxies are grouped together until
the weight of the group is 1000. That is: <br>
allow * <br>
parent 500 socks5 192.168.10.1 1080 <br>
parent 500 connect 192.168.10.1 3128 <br>
makes 3proxy to randomly choose between 2 proxies for all
outgoing connections. These 2 proxies form 1 group
(summarized weight is 1000). <br>
allow * * * 80 <br>
parent 1000 socks5 192.168.10.1 1080 <br>
parent 1000 connect 192.168.20.1 3128 <br>
parent 300 socks4 192.168.30.1 1080 <br>
parent 700 socks5 192.168.40.1 1080 <br>
creates chain of 3 proxies: 192.168.10.1, 192.168.20.1 and
third is (192.168.30.1 with probability of 0.3 or
192.168.40.1 with probability of 0.7) for outgoing web
connections. Chains are only applied to new connections,
pipelined (keep-alive) requests in the same connection use
the same chain.</p>

<p style="margin-left:6%; margin-top: 1em">type is one of:
<b><br>
extip</b> does not actually redirect the request; it sets
the external address for this request to <i>&lt;ip&gt;</i>.
It can be chained with another parent type. It&rsquo;s
useful to set the external IP based on ACL or make it
random. <b><br>
tcp</b> simply redirect connection. TCP is always last in
chain. This type of proxy is a simple TCP redirection, it
does not support parent authentication. <b><br>
http</b> redirect to HTTP proxy. HTTP is always the last
chain. It should only be used with http (proxy) service, if
used with different service, it works as tcp redirection.
<b><br>
pop3</b> redirect to POP3 proxy (only local redirection is
supported, can only be used as a first hop in chaining)
<b><br>
ftp</b> redirect to FTP proxy (only local redirection is
supported, can only be used as a first hop in chaining)
<b><br>
connect</b> parent is HTTP CONNECT method proxy <b><br>
connect+</b> parent is HTTP CONNECT proxy with name
resolution (hostname is used instead of IP if available)
<b><br>
socks4</b> parent is SOCKSv4 proxy <b><br>
socks4+</b> parent is SOCKSv4 proxy with name resolution
(SOCKSv4a) <b><br>
socks5</b> parent is SOCKSv5 proxy <b><br>
socks5+</b> parent is SOCKSv5 proxy with name resolution
<b><br>
socks4b</b> parent is SOCKS4b (broken SOCKSv4 implementation
with shortened server reply; I never saw this kind of
server, but they say there are some). Normally you should
not use this option. Do not confuse this option with
SOCKSv4a (<b>socks4+</b>). <b><br>
socks5b</b> parent is SOCKS5b (broken SOCKSv5 implementation
with shortened server reply. I think you will never find it
useful). Never use this option unless you know exactly you
need it. <b><br>
admin</b> redirect request to local &acute;admin&acute;
service (with -s parameter). <b><br>
ha</b> send HAProxy PROXY protocol v1 header to the next
parent proxy (or to the destination if <b>ha</b> is used
alone). Place <b>ha</b> before the parent that should
receive the header; after the header is sent, negotiation of
that parent protocol continues (SOCKS, CONNECT, etc.).
Useful for passing client IP information to the parent
proxy. Example: <br>
parent 1000 ha 0.0.0.0 0 <br>
parent 1000 socks5 parent.example.com 1080 <br>
Use &quot;+&quot; proxy only with <b>fakeresolve</b> option
<br>
Any parent type above can be suffixed with <b>s</b> (e.g.
<b>https</b>, <b>tcps</b>, <b>socks5s</b>, <b>connect+s</b>)
to establish a TLS-encrypted connection to the parent proxy.
Requires SSL/TLS support (WITH_SSL) and is used with
<b>ssl_client_mode 3</b>, which only handshakes TLS for
<b>s</b>-suffixed parents.</p>

<p style="margin-left:6%; margin-top: 1em">IP and port are
ip addres and port of parent proxy server. If IP is zero, ip
is taken from original request, only port is changed. If
port is zero, it&acute;s taken from original request, only
IP is changed. If both IP and port are zero - it&acute;s a
special case of local redirection, it works only with
<b>socks</b> proxy. In case of local redirection request is
redirected to different service, <b>ftp</b> locally
redirects to <b>ftppr pop3</b> locally redirects to <b>pop3p
imap</b> locally redirects to <b>imapp http</b> locally
redirects to <b>proxy admin</b> locally redirects to the
admin -s service. <br>
Unix domain sockets can be used instead of IP address with
the syntax <i>unix:/path/to/socket</i> (e.g., parent 1000
socks5 unix:/var/run/parent.sock 1080). On Linux, abstract
(fileless) Unix sockets are supported with
<i>unix:@socketname</i> syntax (e.g., parent 1000 http
unix:@parent.proxy 3128). When using Unix sockets, the port
number is ignored but must be specified for syntax
compatibility.</p>

<p style="margin-left:6%; margin-top: 1em">Main purpose of
local redirections is to have the requested resource (URL or
POP3 username) logged and protocol-specific filters applied.
In case of local redirection, ACLs are reviewed twice:
first, by the SOCKS proxy up to the &acute;parent&acute;
command and then by the gateway service the connection is
redirected to (HTTP, FTP or POP3) after the
&acute;parent&acute; command. It means an additional
&acute;allow&acute; command is required for redirected
requests, for example: <br>
allow * * * 80 <br>
parent 1000 http 0.0.0.0 0 <br>
allow * * * 80 HTTP_GET,HTTP_POST <br>
socks <br>
redirects all SOCKS requests with target port 80 to local
HTTP proxy, local HTTP proxy parses requests and allows only
GET and POST requests. <br>
parent 1000 http 1.2.3.4 0 <br>
Changes the external address for a given connection to
1.2.3.4 (equivalent to <b>-e1.2.3.4</b>) <br>
Optional username and password are used to authenticate on
parent proxy. Username of &acute;*&acute; means username
must be supplied by user.</p>


<p style="margin-left:6%; margin-top: 1em"><b>parentretries</b>
<i>&lt;number&gt;</i> <br>
Number of retries to connect to parent proxy. Default is
1.</p>

<p style="margin-left:6%; margin-top: 1em"><b>nolog</b>
<i>&lt;n&gt;</i> <br>
extends last allow or deny command to prevent logging, e.g.
<br>
allow * * 192.168.1.1 <br>
nolog</p>

<p style="margin-left:6%; margin-top: 1em"><b>weight</b>
<i>&lt;n&gt;</i> <br>
extends last allow or deny command to set weight for this
request <br>
allow * * 192.168.1.1 <br>
weight 100 <br>
Weight may be used for different purposes.</p>

<p style="margin-left:6%; margin-top: 1em"><b>force <br>
noforce</b> <br>
If force is specified for service, configuration reload will
require all current sessions of this service to be
re-authenticated. If ACL is changed or user account is
removed, old connections which do not match current are
closed. noforce allows to keep previously authenticated
connections.</p>


<p style="margin-left:6%; margin-top: 1em"><b>bandlimin</b>
<i>&lt;rate&gt; &lt;userlist&gt; &lt;sourcelist&gt;
&lt;targetlist&gt; &lt;targetportlist&gt;
&lt;operationlist&gt; &lt;weekdayslist&gt;
&lt;timeperiodslist&gt;</i> <b><br>
nobandlimin</b> <i>&lt;userlist&gt; &lt;sourcelist&gt;
&lt;targetlist&gt; &lt;targetportlist&gt;
&lt;operationlist&gt; &lt;weekdayslist&gt;
&lt;timeperiodslist&gt;</i> <b><br>
bandlimout</b> <i>&lt;rate&gt; &lt;userlist&gt;
&lt;sourcelist&gt; &lt;targetlist&gt; &lt;targetportlist&gt;
&lt;operationlist&gt; &lt;weekdayslist&gt;
&lt;timeperiodslist&gt;</i> <b><br>
nobandlimout</b> <i>&lt;userlist&gt; &lt;sourcelist&gt;
&lt;targetlist&gt; &lt;targetportlist&gt;
&lt;operationlist&gt; &lt;weekdayslist&gt;
&lt;timeperiodslist&gt;</i> <br>
bandlim sets a bandwidth limitation filter to
<i>&lt;rate&gt;</i> bps (bits per second). If you want to
specify bytes per second, multiply your value by 8. bandlim
rules act in the same manner as allow/deny rules, except for
one thing: bandwidth limiting is applied to all services,
not to some specific service. <b>bandlimin</b> and
<b>nobandlimin</b> apply to incoming traffic <b><br>
bandlimout</b> and <b>nobandlimout</b> apply to outgoing
traffic <br>
If you want to ratelimit your clients with IPs
192.168.10.16/30 (4 addresses) to 57600 bps, you have to
specify 4 rules like <br>
bandlimin 57600 * 192.168.10.16 <br>
bandlimin 57600 * 192.168.10.17 <br>
bandlimin 57600 * 192.168.10.18 <br>
bandlimin 57600 * 192.168.10.19 <br>
and each of your clients will have a 56K channel. If you
specify <br>
bandlimin 57600 * 192.168.10.16/30 <br>
you will have a 56K channel shared between all clients. If
you want, for example, to limit all speed except access to
POP3, you can use <br>
nobandlimin * * * 110 <br>
before the rest of bandlim rules.</p>

<p style="margin-left:6%; margin-top: 1em"><b>connlim</b>
<i>&lt;rate&gt; &lt;period&gt; &lt;userlist&gt;
&lt;sourcelist&gt; &lt;targetlist&gt; &lt;targetportlist&gt;
&lt;operationlist&gt; &lt;weekdayslist&gt;
&lt;timeperiodslist&gt;</i> <b><br>
noconnlim</b> <i>&lt;userlist&gt; &lt;sourcelist&gt;
&lt;targetlist&gt; &lt;targetportlist&gt;
&lt;operationlist&gt; &lt;weekdayslist&gt;
&lt;timeperiodslist&gt;</i> <br>
connlim sets connections rate limit per time period for
traffic pattern controlled by ACL. Period is in seconds. If
period is 0, <b>connlim</b> limits a number of parallel
connections. <br>
connlim 100 60 * 127.0.0.1 <br>
allows 100 connections per minute for 127.0.0.1. <br>
connlim 20 0 * 127.0.0.1 <br>
allows 20 simultaneous connections for 127.0.0.1. <br>
Like with <b>bandlimin</b>, if an individual limit is
required per client, a separate rule must be added for every
client. Like with nobandlimin, noconnlim adds an
exception.</p>

<p style="margin-left:6%; margin-top: 1em"><b>counter</b>
<i>&lt;filename&gt; &lt;reporttype&gt;
&lt;reportname&gt;</i> <b><br>
countin</b> <i>&lt;number&gt; &lt;type&gt; &lt;limit&gt;
&lt;userlist&gt; &lt;sourcelist&gt; &lt;targetlist&gt;
&lt;targetportlist&gt; &lt;operationlist&gt;
&lt;weekdayslist&gt; &lt;timeperiodslist&gt;</i> <b><br>
nocountin</b> <i>&lt;userlist&gt; &lt;sourcelist&gt;
&lt;targetlist&gt; &lt;targetportlist&gt;
&lt;operationlist&gt; &lt;weekdayslist&gt;
&lt;timeperiodslist&gt;</i> <b><br>
countout</b> <i>&lt;number&gt; &lt;type&gt; &lt;limit&gt;
&lt;userlist&gt; &lt;sourcelist&gt; &lt;targetlist&gt;
&lt;targetportlist&gt; &lt;operationlist&gt;
&lt;weekdayslist&gt; &lt;timeperiodslist&gt;</i> <b><br>
nocountout</b> <i>&lt;userlist&gt; &lt;sourcelist&gt;
&lt;targetlist&gt; &lt;targetportlist&gt;
&lt;operationlist&gt; &lt;weekdayslist&gt;
&lt;timeperiodslist&gt;</i> <b><br>
countall</b> <i>&lt;number&gt; &lt;type&gt; &lt;limit&gt;
&lt;userlist&gt; &lt;sourcelist&gt; &lt;targetlist&gt;
&lt;targetportlist&gt; &lt;operationlist&gt;
&lt;weekdayslist&gt; &lt;timeperiodslist&gt;</i> <b><br>
nocountall</b> <i>&lt;userlist&gt; &lt;sourcelist&gt;
&lt;targetlist&gt; &lt;targetportlist&gt;
&lt;operationlist&gt; &lt;weekdayslist&gt;
&lt;timeperiodslist&gt;</i></p>

<p style="margin-left:6%; margin-top: 1em">counter,
countin, nocountin, countout, nocountout, countall,
nocountall commands are used to set a traffic limit in MB
for a period of time (day, week or month). Filename is a
path to a special file where traffic information is
permanently stored. The number is the sequential number of
the record in this file. If the number is 0, this counter is
not preserved in the counter file (that is, if the proxy is
restarted, all counters with 0 are flushed); otherwise, it
should be a unique sequential number which points to the
position of the counter within the file. Type specifies a
type of counter. Type is one of: <b><br>
H</b> - counter is reset hourly <b><br>
D</b> - counter is reset daily <b><br>
W</b> - counter is reset weekly <b><br>
M</b> - counter is reset monthly <br>
reporttype/reportname may be used to generate traffic
reports. Reporttype is one of D, W, M, H (hourly) and
reportname specifies the filename template for reports. The
report is a text file with counter values in the format:
<i><br>
&lt;COUNTERNUMBER&gt; &lt;TRAF&gt;</i> <br>
The rest of parameters is identical to
<b>bandlim</b>/<b>nobandlim</b>.</p>

<p style="margin-left:6%; margin-top: 1em"><b>users</b>
<i>username</i>[:<i>pwtype</i>:<i>password</i>] ... <br>
pwtype is one of: <br>
none (empty) - use system authentication <b><br>
CL</b> - password is cleartext <b><br>
CR</b> - password is crypt-style password. <b>$1$</b> prefix
uses MD5-crypt (requires OpenSSL), <b>$3$</b> prefix uses
BLAKE2b-crypt (always available, see <b>3proxy_crypt</b>(8))
<b><br>
NT</b> - password is NT password (in hex) <br>
example: <br>
users test1:CL:password1
&quot;test2:CR:$1$lFDGlder$pLRb4cU2D7GAT58YQvY49.&quot; <br>
users test3:NT:BD7DFBF29A93F93C63CB84790DA00E63 <br>
users &quot;test4:CR:$3$salt$G47yV9w....&quot; <br>
Note: double quotes are required because the password
contains a $ sign.</p>

<p style="margin-left:6%; margin-top: 1em"><b>flush</b>
<br>
empty the active access list. The access list must be
flushed every time you create a new access list for a new
service. For example: <br>
allow * <br>
pop3p <br>
flush <br>
allow * 192.168.1.0/24 <br>
socks <br>
sets different ACLs for <b>pop3p</b> and <b>socks</b></p>

<p style="margin-left:6%; margin-top: 1em"><b>system</b>
<i>&lt;command&gt;</i> <br>
execute system command</p>

<p style="margin-left:6%; margin-top: 1em"><b>pidfile</b>
<i>&lt;filename&gt;</i> <br>
write pid of current process to file. It can be used to
manipulate 3proxy with signals under Unix. Currently next
signals are available:</p>

<p style="margin-left:6%; margin-top: 1em"><b>monitor</b>
<i>&lt;filename&gt;</i> <br>
If file monitored changes in modification time or size,
3proxy reloads configuration within one minute. Any number
of files may be monitored.</p>

<p style="margin-left:6%; margin-top: 1em"><b>setuid</b>
<i>&lt;uid&gt;</i> <br>
calls setuid(uid), uid can be numeric or since 0.9 username.
Unix only. Warning: under some Linux kernels setuid() works
for current thread only. It makes it impossible to suid for
all threads.</p>

<p style="margin-left:6%; margin-top: 1em"><b>setgid</b>
<i>&lt;gid&gt;</i> <br>
calls setgid(gid), gid can be numeric or since 0.9
groupname. Unix only.</p>

<p style="margin-left:6%; margin-top: 1em"><b>chroot</b>
<i>&lt;path&gt;</i> [<i>&lt;uid&gt;</i>]
[<i>&lt;gid&gt;</i>] <br>
calls chroot(path) and sets gid/uid. Unix only. uid/gid
supported since 0.9, can be numeric or
username/groupname. The time zone and the syslog connection
are set up before the call.
Plugins which read their own configuration or load modules
while running need them inside the chroot: PAM
(<i>/etc/pam.d</i> and the modules it names, read for every
authentication), LDAP (<i>ldap.conf</i> and, for ldaps, the
CA certificates), ODBC (<i>odbc.ini</i>, <i>odbcinst.ini</i>
and the driver libraries, loaded again whenever the
connection is reopened).</p>


<p style="margin-left:6%; margin-top: 1em"><b>stacksize</b>
<i>&lt;value_to_add_to_default_stack_size&gt;</i> <br>
Change the default size for thread stacks. May be required
in some situations, e.g. with non-default plugins, or on
some platforms (some FreeBSD versions may require adjusting
the stack size due to an incorrectly defined value in system
header files; this value is also often required to be
changed for ODBC and PAM support on Linux). If you
experience 3proxy crash on request processing, try to set
some positive value. You may start with stacksize 65536 and
then find the minimal value for the service to work. If you
experience memory shortage, you can try to experiment with
negative values. <br>
With SQL logging (log &amp;ODBC_string) the value is
automatically raised to 32768 if it is smaller, because ODBC
drivers require more stack. A <b>stacksize</b> command
placed after the <b>log</b> command overrides this. <br>
The base stack size the value is added to is 49152. On
FreeBSD, NetBSD, OpenBSD and DragonFly it is 65536, because
libc functions such as vfprintf() called by syslog() use
significantly more stack there. The result is never lowered
below PTHREAD_STACK_MIN, so a large negative value can not
disable the thread stack.</p>

<h2>PLUGINS
<a name="PLUGINS"></a>
</h2>


<p style="margin-left:6%; margin-top: 1em"><b>plugin</b>
<i>&lt;path_to_shared_library&gt;
&lt;function_to_call&gt;</i> [<i>&lt;arg1&gt;</i> ...] <br>
Loads specified library and calls given export function with
given arguments, as <br>
int functions_to_call(struct pluginlink * pl, int argc, char
* argv[]); <br>
function_to_call must return 0 in case of success, value
&gt; 0 to indicate error.</p>


<p style="margin-left:6%; margin-top: 1em"><b>filtermaxsize</b>
<i>&lt;max_size_of_data_to_filter&gt;</i> <br>
If Content-length (or another data length) is greater than
the given value, no data filtering will be performed through
filtering plugins to avoid data corruption and/or
Content-Length changing. Default is 1MB (1048576).</p>

<h2>SSL/TLS SUPPORT
<a name="SSL/TLS SUPPORT"></a>
</h2>


<p style="margin-left:6%; margin-top: 1em">SSL/TLS support
is built into 3proxy (since 0.9.7) when compiled with
OpenSSL (WITH_SSL). Previously available as SSLPlugin, the
functionality is now integrated into the main binary. The
plugin line is no longer required.</p>

<p style="margin-left:6%; margin-top: 1em">SSL/TLS can be
used for: - transparent MITM (Man-in-the-Middle) for TLS
traffic inspection - https:// proxy (TLS-encrypted
connection between client and proxy) - TLS client
connections to upstream servers with certificate
authentication - mTLS (mutual TLS) requiring client
certificates</p>

<h3>MITM Commands
<a name="MITM Commands"></a>
</h3>


<p style="margin-left:6%; margin-top: 1em"><b>ssl_mitm</b>
- spoof certificates for services started below. Usage
without ssl_client_verify is insecure. <b><br>
ssl_nomitm</b> - do not spoof certificates for services
started below</p>

<h3>Server TLS Commands
<a name="Server TLS Commands"></a>
</h3>


<p style="margin-left:6%; margin-top: 1em"><b>ssl_serv</b>
(or ssl_server) - require TLS connection from clients for
services below <b><br>
ssl_noserv</b> (or ssl_noserver) - do not require TLS
connection from clients for services below</p>

<h3>Client TLS Commands
<a name="Client TLS Commands"></a>
</h3>


<p style="margin-left:6%; margin-top: 1em"><b>ssl_cli</b>
(or ssl_client) - establish TLS connection to upstream
server for services below <b><br>
ssl_nocli</b> (or ssl_noclient) - do not establish TLS
connection to upstream server for services below</p>

<h3>SSL Parameters
<a name="SSL Parameters"></a>
</h3>



<p style="margin-left:6%; margin-top: 1em"><b>ssl_server_cert</b>
<i>/path/to/cert</i> - Server certificate (should not be
self-signed, must contain SAN) for ssl_serv <b><br>
ssl_server_key</b> <i>/path/to/key</i> - Server certificate
key for ssl_server_cert or generated MITM certificate
<b><br>
ssl_client_cert</b> <i>/path/to/cert</i> - Client
certificate for authentication on upstream server (used with
ssl_cli) <b><br>
ssl_client_key</b> <i>/path/to/key</i> - Client certificate
key for ssl_client_cert <b><br>
ssl_client_ciphersuites</b> <i>ciphersuites_list</i> - TLS
client ciphers for TLS 1.3 <b><br>
ssl_server_ciphersuites</b> <i>ciphersuites_list</i> - TLS
server ciphers for TLS 1.3 <b><br>
ssl_client_cipher_list</b> <i>ciphers_list</i> - TLS client
ciphers for TLS 1.2 and below <b><br>
ssl_server_cipher_list</b> <i>ciphers_list</i> - TLS server
ciphers for TLS 1.2 and below <b><br>
ssl_client_min_proto_version</b> <i>tls_version</i> - TLS
client minimum TLS version (e.g., TLSv1.2) <b><br>
ssl_server_min_proto_version</b> <i>tls_version</i> - TLS
server minimum TLS version <b><br>
ssl_client_max_proto_version</b> <i>tls_version</i> - TLS
client maximum TLS version <b><br>
ssl_server_max_proto_version</b> <i>tls_version</i> - TLS
server maximum TLS version <b><br>
ssl_client_verify</b> - verify the certificate for the
upstream server (used with ssl_mitm or ssl_cli) <b><br>
ssl_client_no_verify</b> - do not verify the certificate for
the upstream server (default) <b><br>
ssl_server_verify</b> - require client certificate
authentication (mTLS) for ssl_serv <b><br>
ssl_server_no_verify</b> - do not require client certificate
(default) <b><br>
ssl_server_ca_file</b> <i>/path/to/cafile</i> - CA
certificate file for MITM <b><br>
ssl_server_ca_key</b> <i>/path/to/cakey</i> - key for
ssl_server_ca_file MITM CA <b><br>
ssl_server_ca_dir</b> <i>/path/to/cadir</i> - CA directory
for ssl_server_verify <b><br>
ssl_server_ca_store</b> <i>/path/to/castore</i> - CA store
for ssl_server_verify (OpenSSL 3.0+) <b><br>
ssl_client_ca_file</b> <i>/path/to/cafile</i> - CA file for
ssl_client_verify <b><br>
ssl_client_ca_dir</b> <i>/path/to/cadir</i> - CA directory
for ssl_client_verify <b><br>
ssl_client_ca_store</b> <i>/path/to/castore</i> - CA store
for ssl_client_verify (OpenSSL 3.0+) <b><br>
ssl_client_sni</b> <i>hostname</i> - SNI hostname to send to
upstream server <b><br>
ssl_client_alpn</b> <i>protocol1 protocol2 ...</i> - ALPN
protocols to negotiate with upstream server <b><br>
ssl_client_mode</b> <i>mode</i> - when to establish TLS
connection: 0 - on connect (default), 1 - after
authentication, 2 - before data, 3 - only for secure parent
types (ending with &rsquo;s&rsquo;) <b><br>
ssl_certcache</b> <i>/path/to/cache/</i> - location for the
generated MITM certificates cache</p>

<h2>PCRE FILTERING
<a name="PCRE FILTERING"></a>
</h2>


<p style="margin-left:6%; margin-top: 1em">PCRE (Perl
Compatible Regular Expressions) filtering is built into
3proxy (since 0.9.7) when compiled with PCRE2 support
(WITH_PCRE). Previously available as PCREPlugin, the
functionality is now integrated into the main binary. The
plugin line is no longer required.</p>

<p style="margin-left:6%; margin-top: 1em">PCRE filtering
allows creating matching and replacement rules with regular
expressions for client requests, headers, and data.</p>

<h3>PCRE Commands
<a name="PCRE Commands"></a>
</h3>


<p style="margin-left:6%; margin-top: 1em"><b>pcre</b>
<i>TYPE FILTER_ACTION REGEXP [ACE]</i> <br>
Apply a rule for matching regular expression. <b><br>
pcre_rewrite</b> <i>TYPE FILTER_ACTION REGEXP
REWRITE_EXPRESSION [ACE]</i> <br>
Match and replace with rewrite expression. <b><br>
pcre_extend</b> <i>FILTER_ACTION [ACE]</i> <br>
Extend the ACL of the last pcre or pcre_rewrite command by
adding an additional ACE. <b><br>
pcre_options</b> <i>OPTION1 [OPTION2 ...]</i> <br>
Set matching options. Both PCRE2 native options and PCRE
compatibility options are supported. PCRE options are mapped
to their PCRE2 equivalents for backward compatibility. <br>
PCRE2 options: PCRE2_CASELESS, PCRE2_MULTILINE,
PCRE2_DOTALL, PCRE2_EXTENDED, PCRE2_DOLLAR_ENDONLY,
PCRE2_UNGREEDY, PCRE2_UTF, PCRE2_UCP, PCRE2_NO_AUTO_CAPTURE,
PCRE2_FIRSTLINE, PCRE2_DUPNAMES, PCRE2_MATCH_UNSET_BACKREF,
PCRE2_ALT_BSUX, PCRE2_ALT_CIRCUMFLEX, PCRE2_ALT_VERBNAMES,
PCRE2_USE_OFFSET_LIMIT, PCRE2_EXTENDED_MORE, PCRE2_LITERAL,
PCRE2_MATCH_INVALID_UTF. <br>
PCRE compatibility options: PCRE_CASELESS, PCRE_MULTILINE,
PCRE_DOTALL, PCRE_EXTENDED, PCRE_ANCHORED,
PCRE_DOLLAR_ENDONLY, PCRE_EXTRA, PCRE_NOTBOL, PCRE_NOTEOL,
PCRE_UNGREEDY, PCRE_NOTEMPTY, PCRE_UTF8,
PCRE_NO_AUTO_CAPTURE, PCRE_NO_UTF8_CHECK, PCRE_AUTO_CALLOUT,
PCRE_PARTIAL, PCRE_DFA_SHORTEST, PCRE_DFA_RESTART,
PCRE_FIRSTLINE, PCRE_DUPNAMES, PCRE_NEWLINE_CR,
PCRE_NEWLINE_LF, PCRE_NEWLINE_CRLF, PCRE_NEWLINE_ANY,
PCRE_NEWLINE_ANYCRLF, PCRE_BSR_ANYCRLF,
PCRE_BSR_UNICODE.</p>

<h3>PCRE Parameters
<a name="PCRE Parameters"></a>
</h3>


<p style="margin-left:6%; margin-top: 1em">TYPE - type of
filtered data (comma-delimited list): <br>
request - content of the client&rsquo;s request (e.g., HTTP
GET request string) <br>
cliheader - content of the client request headers <br>
srvheader - content of the server&rsquo;s reply headers <br>
clidata - data received from the client (e.g., HTTP POST
data) <br>
srvdata - data received from the server (e.g., HTML
page)</p>

<p style="margin-left:6%; margin-top: 1em">FILTER_ACTION -
action on match: <br>
allow - allow this request without checking the rest of the
rules <br>
deny - deny this request without checking the rest of the
rules <br>
dunno - continue with the rest of the rules (useful with
pcre_rewrite)</p>

<p style="margin-left:6%; margin-top: 1em">REGEXP - PCRE
(Perl) regular expression. Use * if no regexp matching is
required.</p>


<p style="margin-left:6%; margin-top: 1em">REWRITE_EXPRESSION
- substitution string. May contain Perl-style substrings $1,
$2, etc. $0 means the whole matched string. \r and \n may be
used to insert new lines; the string may be empty
(&quot;&quot;).</p>

<p style="margin-left:6%; margin-top: 1em">ACE - access
control entry (user names, source IPs, destination IPs,
ports, etc.), identical to allow/deny/bandlimin commands.
The regular expression is only matched if the ACL matches
the connection data. Warning: Regular expressions
don&rsquo;t require authentication and cannot replace
authentication and/or allow/deny ACLs.</p>

<h2>BUGS
<a name="BUGS"></a>
</h2>


<p style="margin-left:6%; margin-top: 1em">Report all bugs
to <b>3proxy@3proxy.org</b></p>

<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>


<p style="margin-left:6%; margin-top: 1em">3proxy(8),
3proxy_crypt(8), proxy(8), ftppr(8), socks(8), pop3p(8),
imapp(8), smtpp(8), tlspr(8), tcppm(8), udppm(8),
syslogd(8), <br>
https://3proxy.org/</p>

<h2>AUTHORS
<a name="AUTHORS"></a>
</h2>


<p style="margin-left:6%; margin-top: 1em">3proxy is
designed by Vladimir Dubrovin &lt;vlad@3proxy.org&gt;</p>
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