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control-spec.txt
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TC: A Tor control protocol (Version 1)
0. Scope
This document describes an implementation-specific protocol that is used
for other programs (such as frontend user-interfaces) to communicate with a
locally running Tor process. It is not part of the Tor onion routing
protocol.
This protocol replaces version 0 of TC, which is now deprecated. For
reference, TC is described in "control-spec-v0.txt". Implementors are
recommended to avoid using TC directly, but instead to use a library that
can easily be updated to use the newer protocol. (Version 0 is used by Tor
versions 0.1.0.x; the protocol in this document only works with Tor
versions in the 0.1.1.x series and later.)
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
RFC 2119.
1. Protocol outline
TC is a bidirectional message-based protocol. It assumes an underlying
stream for communication between a controlling process (the "client"
or "controller") and a Tor process (or "server"). The stream may be
implemented via TCP, TLS-over-TCP, a Unix-domain socket, or so on,
but it must provide reliable in-order delivery. For security, the
stream should not be accessible by untrusted parties.
In TC, the client and server send typed messages to each other over the
underlying stream. The client sends "commands" and the server sends
"replies".
By default, all messages from the server are in response to messages from
the client. Some client requests, however, will cause the server to send
messages to the client indefinitely far into the future. Such
"asynchronous" replies are marked as such.
Servers respond to messages in the order messages are received.
1.1. Forward-compatibility
This is an evolving protocol; new client and server behavior will be
allowed in future versions. To allow new backward-compatible behavior
on behalf of the client, we may add new commands and allow existing
commands to take new arguments in future versions. To allow new
backward-compatible server behavior, we note various places below
where servers speaking a future version of this protocol may insert
new data, and note that clients should/must "tolerate" unexpected
elements in these places. There are two ways that we do this:
* Adding a new field to a message:
For example, we might say "This message has three space-separated
fields; clients MUST tolerate more fields." This means that a
client MUST NOT crash or otherwise fail to parse the message or
other subsequent messages when there are more than three fields, and
that it SHOULD function at least as well when more fields are
provided as it does when it only gets the fields it accepts. The
most obvious way to do this is by ignoring additional fields; the
next-most-obvious way is to report additional fields verbatim to the
user, perhaps as part of an expert UI.
* Adding a new possible value to a list of alternatives:
For example, we might say "This field will be OPEN, CLOSED, or
CONNECTED. Clients MUST tolerate unexpected values." This means
that a client MUST NOT crash or otherwise fail to parse the message
or other subsequent messages when there are unexpected values, and
that it SHOULD try to handle the rest of the message as well as it
can. The most obvious way to do this is by pretending that each
list of alternatives has an additional "unrecognized value" element,
and mapping any unrecognized values to that element; the
next-most-obvious way is to create a separate "unrecognized value"
element for each unrecognized value.
Clients SHOULD NOT "tolerate" unrecognized alternatives by
pretending that the message containing them is absent. For example,
a stream closed for an unrecognized reason is nevertheless closed,
and should be reported as such.
(If some list of alternatives is given, and there isn't an explicit
statement that clients must tolerate unexpected values, clients still
must tolerate unexpected values. The only exception would be if there
were an explicit statement that no future values will ever be added.)
2. Message format
2.1. Description format
The message formats listed below use ABNF as described in RFC 2234.
The protocol itself is loosely based on SMTP (see RFC 2821).
We use the following nonterminals from RFC 2822: atom, qcontent
We define the following general-use nonterminals:
QuotedString = DQUOTE *qcontent DQUOTE
There are explicitly no limits on line length. All 8-bit characters
are permitted unless explicitly disallowed. In QuotedStrings,
backslashes and quotes must be escaped; other characters need not be
escaped.
Wherever CRLF is specified to be accepted from the controller, Tor MAY also
accept LF. Tor, however, MUST NOT generate LF instead of CRLF.
Controllers SHOULD always send CRLF.
2.1.1. Notes on an escaping bug
CString = DQUOTE *qcontent DQUOTE
Note that although these nonterminals have the same grammar, they
are interpreted differently. In a QuotedString, a backslash
followed by any character represents that character. But
in a CString, the escapes "\n", "\t", "\r", and the octal escapes
"\0" ... "\377" represent newline, tab, carriage return, and the
256 possible octet values respectively.
The use of CString in this document reflect a bug in Tor;
they should have been QuotedString instead. In the future, they
may migrate to use QuotedString instead. If they do, the
QuotedString implementation will never place a backslash before a
"n", "t", "r", or digit, to ensure that old controllers don't get
confused.
For future-proofing, controller implementors MAY use the following
rules to be compatible with buggy Tor implementations and with
future ones that implement the spec as intended:
Read \n \t \r and \0 ... \377 as C escapes.
Treat a backslash followed by any other character as that character.
Currently, many of the QuotedString instances below that Tor
outputs are in fact CStrings. We intend to fix this in future
versions of Tor, and document which ones were broken. (See
bugtracker ticket #14555 for a bit more information.)
Note that this bug exists only in strings generated by Tor for the
Tor controller; Tor should parse input QuotedStrings from the
controller correctly.
2.2. Commands from controller to Tor
Command = Keyword OptArguments CRLF / "+" Keyword OptArguments CRLF CmdData
Keyword = 1*ALPHA
OptArguments = [ SP *(SP / VCHAR) ]
A command is either a single line containing a Keyword and arguments, or a
multiline command whose initial keyword begins with +, and whose data
section ends with a single "." on a line of its own. (We use a special
character to distinguish multiline commands so that Tor can correctly parse
multi-line commands that it does not recognize.) Specific commands and
their arguments are described below in section 3.
2.3. Replies from Tor to the controller
Reply = SyncReply / AsyncReply
SyncReply = *(MidReplyLine / DataReplyLine) EndReplyLine
AsyncReply = *(MidReplyLine / DataReplyLine) EndReplyLine
MidReplyLine = StatusCode "-" ReplyLine
DataReplyLine = StatusCode "+" ReplyLine CmdData
EndReplyLine = StatusCode SP ReplyLine
ReplyLine = [ReplyText] CRLF
ReplyText = XXXX
StatusCode = 3DIGIT
Multiple lines in a single reply from Tor to the controller are guaranteed to
share the same status code. Specific replies are mentioned below in section 3,
and described more fully in section 4.
[Compatibility note: versions of Tor before 0.2.0.3-alpha sometimes
generate AsyncReplies of the form "*(MidReplyLine / DataReplyLine)".
This is incorrect, but controllers that need to work with these
versions of Tor should be prepared to get multi-line AsyncReplies with
the final line (usually "650 OK") omitted.]
2.4. General-use tokens
; CRLF means, "the ASCII Carriage Return character (decimal value 13)
; followed by the ASCII Linefeed character (decimal value 10)."
CRLF = CR LF
; How a controller tells Tor about a particular OR. There are four
; possible formats:
; $Fingerprint -- The router whose identity key hashes to the fingerprint.
; This is the preferred way to refer to an OR.
; $Fingerprint~Nickname -- The router whose identity key hashes to the
; given fingerprint, but only if the router has the given nickname.
; $Fingerprint=Nickname -- The router whose identity key hashes to the
; given fingerprint, but only if the router is Named and has the given
; nickname.
; Nickname -- The Named router with the given nickname, or, if no such
; router exists, any router whose nickname matches the one given.
; This is not a safe way to refer to routers, since Named status
; could under some circumstances change over time.
;
; The tokens that implement the above follow:
ServerSpec = LongName / Nickname
LongName = Fingerprint [ ( "=" / "~" ) Nickname ]
Fingerprint = "$" 40*HEXDIG
NicknameChar = "a"-"z" / "A"-"Z" / "0" - "9"
Nickname = 1*19 NicknameChar
; What follows is an outdated way to refer to ORs.
; Feature VERBOSE_NAMES replaces ServerID with LongName in events and
; GETINFO results. VERBOSE_NAMES can be enabled starting in Tor version
; 0.1.2.2-alpha and it is always-on in 0.2.2.1-alpha and later.
ServerID = Nickname / Fingerprint
; Unique identifiers for streams or circuits. Currently, Tor only
; uses digits, but this may change
StreamID = 1*16 IDChar
CircuitID = 1*16 IDChar
ConnID = 1*16 IDChar
QueueID = 1*16 IDChar
IDChar = ALPHA / DIGIT
Address = ip4-address / ip6-address / hostname (XXXX Define these)
; A "CmdData" section is a sequence of octets concluded by the terminating
; sequence CRLF "." CRLF. The terminating sequence may not appear in the
; body of the data. Leading periods on lines in the data are escaped with
; an additional leading period as in RFC 2821 section 4.5.2.
CmdData = *DataLine "." CRLF
DataLine = CRLF / "." 1*LineItem CRLF / NonDotItem *LineItem CRLF
LineItem = NonCR / 1*CR NonCRLF
NonDotItem = NonDotCR / 1*CR NonCRLF
; ISOTime, ISOTime2, and ISOTime2Frac are time formats as specified in
; ISO8601.
; example ISOTime: "2012-01-11 12:15:33"
; example ISOTime2: "2012-01-11T12:15:33"
; example ISOTime2Frac: "2012-01-11T12:15:33.51"
IsoDatePart = 4*DIGIT "-" 2*DIGIT "-" 2*DIGIT
IsoTimePart = 2*DIGIT ":" 2*DIGIT ":" 2*DIGIT
ISOTime = IsoDatePart " " IsoTimePart
ISOTime2 = IsoDatePart "T" IsoTimePart
ISOTime2Frac = IsoTime2 [ "." 1*DIGIT ]
3. Commands
All commands are case-insensitive, but most keywords are case-sensitive.
3.1. SETCONF
Change the value of one or more configuration variables. The syntax is:
"SETCONF" 1*(SP keyword ["=" value]) CRLF
value = String / QuotedString
Tor behaves as though it had just read each of the key-value pairs
from its configuration file. Keywords with no corresponding values have
their configuration values reset to 0 or NULL (use RESETCONF if you want
to set it back to its default). SETCONF is all-or-nothing: if there
is an error in any of the configuration settings, Tor sets none of them.
Tor responds with a "250 configuration values set" reply on success.
If some of the listed keywords can't be found, Tor replies with a
"552 Unrecognized option" message. Otherwise, Tor responds with a
"513 syntax error in configuration values" reply on syntax error, or a
"553 impossible configuration setting" reply on a semantic error.
Some configuration options (e.g. "Bridge") take multiple values. Also,
some configuration keys (e.g. for hidden services and for entry
guard lists) form a context-sensitive group where order matters (see
GETCONF below). In these cases, setting _any_ of the options in a
SETCONF command is taken to reset all of the others. For example,
if two ORListenAddress values are configured, and a SETCONF command
arrives containing a single ORListenAddress value, the new command's
value replaces the two old values.
Sometimes it is not possible to change configuration options solely by
issuing a series of SETCONF commands, because the value of one of the
configuration options depends on the value of another which has not yet
been set. Such situations can be overcome by setting multiple configuration
options with a single SETCONF command (e.g. SETCONF ORPort=443
ORListenAddress=9001).
3.2. RESETCONF
Remove all settings for a given configuration option entirely, assign
its default value (if any), and then assign the String provided.
Typically the String is left empty, to simply set an option back to
its default. The syntax is:
"RESETCONF" 1*(SP keyword ["=" String]) CRLF
Otherwise it behaves like SETCONF above.
3.3. GETCONF
Request the value of a configuration variable. The syntax is:
"GETCONF" 1*(SP keyword) CRLF
If all of the listed keywords exist in the Tor configuration, Tor replies
with a series of reply lines of the form:
250 keyword=value
If any option is set to a 'default' value semantically different from an
empty string, Tor may reply with a reply line of the form:
250 keyword
Value may be a raw value or a quoted string. Tor will try to use unquoted
values except when the value could be misinterpreted through not being
quoted. (Right now, Tor supports no such misinterpretable values for
configuration options.)
If some of the listed keywords can't be found, Tor replies with a
"552 unknown configuration keyword" message.
If an option appears multiple times in the configuration, all of its
key-value pairs are returned in order.
Some options are context-sensitive, and depend on other options with
different keywords. These cannot be fetched directly. Currently there
is only one such option: clients should use the "HiddenServiceOptions"
virtual keyword to get all HiddenServiceDir, HiddenServicePort,
HiddenServiceVersion, and HiddenserviceAuthorizeClient option settings.
3.4. SETEVENTS
Request the server to inform the client about interesting events. The
syntax is:
"SETEVENTS" [SP "EXTENDED"] *(SP EventCode) CRLF
EventCode = 1*(ALPHA / "_") (see section 4.1.x for event types)
Any events *not* listed in the SETEVENTS line are turned off; thus, sending
SETEVENTS with an empty body turns off all event reporting.
The server responds with a "250 OK" reply on success, and a "552
Unrecognized event" reply if one of the event codes isn't recognized. (On
error, the list of active event codes isn't changed.)
If the flag string "EXTENDED" is provided, Tor may provide extra
information with events for this connection; see 4.1 for more information.
NOTE: All events on a given connection will be provided in extended format,
or none.
NOTE: "EXTENDED" was first supported in Tor 0.1.1.9-alpha; it is
always-on in Tor 0.2.2.1-alpha and later.
Each event is described in more detail in Section 4.1.
3.5. AUTHENTICATE
Sent from the client to the server. The syntax is:
"AUTHENTICATE" [ SP 1*HEXDIG / QuotedString ] CRLF
The server responds with "250 OK" on success or "515 Bad authentication" if
the authentication cookie is incorrect. Tor closes the connection on an
authentication failure.
The authentication token can be specified as either a quoted ASCII string,
or as an unquoted hexadecimal encoding of that same string (to avoid escaping
issues).
For information on how the implementation securely stores authentication
information on disk, see section 5.1.
Before the client has authenticated, no command other than
PROTOCOLINFO, AUTHCHALLENGE, AUTHENTICATE, or QUIT is valid. If the
controller sends any other command, or sends a malformed command, or
sends an unsuccessful AUTHENTICATE command, or sends PROTOCOLINFO or
AUTHCHALLENGE more than once, Tor sends an error reply and closes
the connection.
To prevent some cross-protocol attacks, the AUTHENTICATE command is still
required even if all authentication methods in Tor are disabled. In this
case, the controller should just send "AUTHENTICATE" CRLF.
(Versions of Tor before 0.1.2.16 and 0.2.0.4-alpha did not close the
connection after an authentication failure.)
3.6. SAVECONF
Sent from the client to the server. The syntax is:
"SAVECONF" CRLF
Instructs the server to write out its config options into its torrc. Server
returns "250 OK" if successful, or "551 Unable to write configuration
to disk" if it can't write the file or some other error occurs.
See also the "getinfo config-text" command, if the controller wants
to write the torrc file itself.
3.7. SIGNAL
Sent from the client to the server. The syntax is:
"SIGNAL" SP Signal CRLF
Signal = "RELOAD" / "SHUTDOWN" / "DUMP" / "DEBUG" / "HALT" /
"HUP" / "INT" / "USR1" / "USR2" / "TERM" / "NEWNYM" /
"CLEARDNSCACHE" / "HEARTBEAT"
The meaning of the signals are:
RELOAD -- Reload: reload config items. (like HUP)
SHUTDOWN -- Controlled shutdown: if server is an OP, exit immediately.
If it's an OR, close listeners and exit after
ShutdownWaitLength seconds. (like INT)
DUMP -- Dump stats: log information about open connections and
circuits. (like USR1)
DEBUG -- Debug: switch all open logs to loglevel debug. (like USR2)
HALT -- Immediate shutdown: clean up and exit now. (like TERM)
CLEARDNSCACHE -- Forget the client-side cached IPs for all hostnames.
NEWNYM -- Switch to clean circuits, so new application requests
don't share any circuits with old ones. Also clears
the client-side DNS cache. (Tor MAY rate-limit its
response to this signal.)
HEARTBEAT -- Make Tor dump an unscheduled Heartbeat message to log.
The server responds with "250 OK" if the signal is recognized (or simply
closes the socket if it was asked to close immediately), or "552
Unrecognized signal" if the signal is unrecognized.
3.8. MAPADDRESS
Sent from the client to the server. The syntax is:
"MAPADDRESS" 1*(Address "=" Address SP) CRLF
The first address in each pair is an "original" address; the second is a
"replacement" address. The client sends this message to the server in
order to tell it that future SOCKS requests for connections to the original
address should be replaced with connections to the specified replacement
address. If the addresses are well-formed, and the server is able to
fulfill the request, the server replies with a 250 message:
250-OldAddress1=NewAddress1
250 OldAddress2=NewAddress2
containing the source and destination addresses. If request is
malformed, the server replies with "512 syntax error in command
argument". If the server can't fulfill the request, it replies with
"451 resource exhausted".
The client may decline to provide a body for the original address, and
instead send a special null address ("0.0.0.0" for IPv4, "::0" for IPv6, or
"." for hostname), signifying that the server should choose the original
address itself, and return that address in the reply. The server
should ensure that it returns an element of address space that is unlikely
to be in actual use. If there is already an address mapped to the
destination address, the server may reuse that mapping.
If the original address is already mapped to a different address, the old
mapping is removed. If the original address and the destination address
are the same, the server removes any mapping in place for the original
address.
Example:
C: MAPADDRESS 0.0.0.0=torproject.org 1.2.3.4=tor.freehaven.net
S: 250-127.192.10.10=torproject.org
S: 250 1.2.3.4=tor.freehaven.net
{Note: This feature is designed to be used to help Tor-ify applications
that need to use SOCKS4 or hostname-less SOCKS5. There are three
approaches to doing this:
1. Somehow make them use SOCKS4a or SOCKS5-with-hostnames instead.
2. Use tor-resolve (or another interface to Tor's resolve-over-SOCKS
feature) to resolve the hostname remotely. This doesn't work
with special addresses like x.onion or x.y.exit.
3. Use MAPADDRESS to map an IP address to the desired hostname, and then
arrange to fool the application into thinking that the hostname
has resolved to that IP.
This functionality is designed to help implement the 3rd approach.}
Mappings set by the controller last until the Tor process exits:
they never expire. If the controller wants the mapping to last only
a certain time, then it must explicitly un-map the address when that
time has elapsed.
3.9. GETINFO
Sent from the client to the server. The syntax is as for GETCONF:
"GETINFO" 1*(SP keyword) CRLF
one or more NL-terminated strings. The server replies with an INFOVALUE
message, or a 551 or 552 error.
Unlike GETCONF, this message is used for data that are not stored in the Tor
configuration file, and that may be longer than a single line. On success,
one ReplyLine is sent for each requested value, followed by a final 250 OK
ReplyLine. If a value fits on a single line, the format is:
250-keyword=value
If a value must be split over multiple lines, the format is:
250+keyword=
value
.
Recognized keys and their values include:
"version" -- The version of the server's software, including the name
of the software. (example: "Tor 0.0.9.4")
"config-file" -- The location of Tor's configuration file ("torrc").
"config-defaults-file" -- The location of Tor's configuration
defaults file ("torrc.defaults"). This file gets parsed before
torrc, and is typically used to replace Tor's default
configuration values. [First implemented in 0.2.3.9-alpha.]
"config-text" -- The contents that Tor would write if you send it
a SAVECONF command, so the controller can write the file to
disk itself. [First implemented in 0.2.2.7-alpha.]
"exit-policy/default" -- The default exit policy lines that Tor will
*append* to the ExitPolicy config option.
"exit-policy/reject-private/default" -- The default exit policy lines
that Tor will *prepend* to the ExitPolicy config option when
ExitPolicyRejectPrivate is 1.
"exit-policy/reject-private/relay" -- The relay-specific exit policy
lines that Tor will *prepend* to the ExitPolicy config option when
ExitPolicyRejectPrivate is 1. These lines are based on the public
addresses configured in the torrc and present on the relay's
interfaces.
"exit-policy/ipv4"
"exit-policy/ipv6"
"exit-policy/full" -- This OR's exit policy, in IPv4-only, IPv6-only, or
all-entries flavors.
"desc/id/<OR identity>" or "desc/name/<OR nickname>" -- the latest
server descriptor for a given OR. (Note that modern Tor clients
do not download server descriptors by default, but download
microdescriptors instead. If microdescriptors are enabled, you'll
need to use "md" instead.)
"md/id/<OR identity>" or "md/name/<OR nickname>" -- the latest
microdescriptor for a given OR. [First implemented in
0.2.3.8-alpha.]
"dormant" -- A nonnegative integer: zero if Tor is currently active and
building circuits, and nonzero if Tor has gone idle due to lack of use
or some similar reason. [First implemented in 0.2.3.16-alpha]
"desc-annotations/id/<OR identity>" -- outputs the annotations string
(source, timestamp of arrival, purpose, etc) for the corresponding
descriptor. [First implemented in 0.2.0.13-alpha.]
"extra-info/digest/<digest>" -- the extrainfo document whose digest (in
hex) is <digest>. Only available if we're downloading extra-info
documents.
"ns/id/<OR identity>" or "ns/name/<OR nickname>" -- the latest router
status info (v3 directory style) for a given OR. Router status
info is as given in
dir-spec.txt, and reflects the current beliefs of this Tor about the
router in question. Like directory clients, controllers MUST
tolerate unrecognized flags and lines. The published date and
descriptor digest are those believed to be best by this Tor,
not necessarily those for a descriptor that Tor currently has.
[First implemented in 0.1.2.3-alpha.]
[In 0.2.0.9-alpha this switched from v2 directory style to v3]
"ns/all" -- Router status info (v3 directory style) for all ORs we
have an opinion about, joined by newlines.
[First implemented in 0.1.2.3-alpha.]
[In 0.2.0.9-alpha this switched from v2 directory style to v3]
"ns/purpose/<purpose>" -- Router status info (v3 directory style)
for all ORs of this purpose. Mostly designed for /ns/purpose/bridge
queries.
[First implemented in 0.2.0.13-alpha.]
[In 0.2.0.9-alpha this switched from v2 directory style to v3]
"desc/all-recent" -- the latest server descriptor for every router that
Tor knows about. (See md note about "desc/id" and "desc/name" above.)
"network-status" -- a space-separated list (v1 directory style)
of all known OR identities. This is in the same format as the
router-status line in v1 directories; see dir-spec-v1.txt section
3 for details. (If VERBOSE_NAMES is enabled, the output will
not conform to dir-spec-v1.txt; instead, the result will be a
space-separated list of LongName, each preceded by a "!" if it is
believed to be not running.) This option is deprecated; use
"ns/all" instead.
"address-mappings/all"
"address-mappings/config"
"address-mappings/cache"
"address-mappings/control" -- a \r\n-separated list of address
mappings, each in the form of "from-address to-address expiry".
The 'config' key returns those address mappings set in the
configuration; the 'cache' key returns the mappings in the
client-side DNS cache; the 'control' key returns the mappings set
via the control interface; the 'all' target returns the mappings
set through any mechanism.
Expiry is formatted as with ADDRMAP events, except that "expiry" is
always a time in UTC or the string "NEVER"; see section 4.1.7.
First introduced in 0.2.0.3-alpha.
"addr-mappings/*" -- as for address-mappings/*, but without the
expiry portion of the value. Use of this value is deprecated
since 0.2.0.3-alpha; use address-mappings instead.
"address" -- the best guess at our external IP address. If we
have no guess, return a 551 error. (Added in 0.1.2.2-alpha)
"fingerprint" -- the contents of the fingerprint file that Tor
writes as a relay, or a 551 if we're not a relay currently.
(Added in 0.1.2.3-alpha)
"circuit-status"
A series of lines as for a circuit status event. Each line is of
the form described in section 4.1.1, omitting the initial
"650 CIRC ". Note that clients must be ready to accept additional
arguments as described in section 4.1.
"stream-status"
A series of lines as for a stream status event. Each is of the form:
StreamID SP StreamStatus SP CircuitID SP Target CRLF
"orconn-status"
A series of lines as for an OR connection status event. In Tor
0.1.2.2-alpha with feature VERBOSE_NAMES enabled and in Tor
0.2.2.1-alpha and later by default, each line is of the form:
LongName SP ORStatus CRLF
In Tor versions 0.1.2.2-alpha through 0.2.2.1-alpha with feature
VERBOSE_NAMES turned off and before version 0.1.2.2-alpha, each line
is of the form:
ServerID SP ORStatus CRLF
"entry-guards"
A series of lines listing the currently chosen entry guards, if any.
In Tor 0.1.2.2-alpha with feature VERBOSE_NAMES enabled and in Tor
0.2.2.1-alpha and later by default, each line is of the form:
LongName SP Status [SP ISOTime] CRLF
In Tor versions 0.1.2.2-alpha through 0.2.2.1-alpha with feature
VERBOSE_NAMES turned off and before version 0.1.2.2-alpha, each line
is of the form:
ServerID2 SP Status [SP ISOTime] CRLF
ServerID2 = Nickname / 40*HEXDIG
The definition of Status is the same for both:
Status = "up" / "never-connected" / "down" /
"unusable" / "unlisted"
[From 0.1.1.4-alpha to 0.1.1.10-alpha, entry-guards was called
"helper-nodes". Tor still supports calling "helper-nodes", but it
is deprecated and should not be used.]
[Older versions of Tor (before 0.1.2.x-final) generated 'down' instead
of unlisted/unusable. Between 0.1.2.x-final and 0.2.6.3-alpha,
'down' was never generated.]
[XXXX ServerID2 differs from ServerID in not prefixing fingerprints
with a $. This is an implementation error. It would be nice to add
the $ back in if we can do so without breaking compatibility.]
"traffic/read" -- Total bytes read (downloaded).
"traffic/written" -- Total bytes written (uploaded).
"accounting/enabled"
"accounting/hibernating"
"accounting/bytes"
"accounting/bytes-left"
"accounting/interval-start"
"accounting/interval-wake"
"accounting/interval-end"
Information about accounting status. If accounting is enabled,
"enabled" is 1; otherwise it is 0. The "hibernating" field is "hard"
if we are accepting no data; "soft" if we're accepting no new
connections, and "awake" if we're not hibernating at all. The "bytes"
and "bytes-left" fields contain (read-bytes SP write-bytes), for the
start and the rest of the interval respectively. The 'interval-start'
and 'interval-end' fields are the borders of the current interval; the
'interval-wake' field is the time within the current interval (if any)
where we plan[ned] to start being active. The times are UTC.
"config/names"
A series of lines listing the available configuration options. Each is
of the form:
OptionName SP OptionType [ SP Documentation ] CRLF
OptionName = Keyword
OptionType = "Integer" / "TimeInterval" / "TimeMsecInterval" /
"DataSize" / "Float" / "Boolean" / "Time" / "CommaList" /
"Dependant" / "Virtual" / "String" / "LineList"
Documentation = Text
"config/defaults"
A series of lines listing default values for each configuration
option. Options which don't have a valid default don't show up
in the list. Introduced in Tor 0.2.4.1-alpha.
OptionName SP OptionValue CRLF
OptionName = Keyword
OptionValue = Text
"info/names"
A series of lines listing the available GETINFO options. Each is of
one of these forms:
OptionName SP Documentation CRLF
OptionPrefix SP Documentation CRLF
OptionPrefix = OptionName "/*"
The OptionPrefix form indicates a number of options beginning with the
prefix. So if "config/*" is listed, other options beginning with
"config/" will work, but "config/*" itself is not an option.
"events/names"
A space-separated list of all the events supported by this version of
Tor's SETEVENTS.
"features/names"
A space-separated list of all the features supported by this version
of Tor's USEFEATURE.
"signal/names"
A space-separated list of all the values supported by the SIGNAL
command.
"ip-to-country/*"
Maps IP addresses to 2-letter country codes. For example,
"GETINFO ip-to-country/18.0.0.1" should give "US".
"next-circuit/IP:port"
XXX todo.
"process/pid" -- Process id belonging to the main tor process.
"process/uid" -- User id running the tor process, -1 if unknown (this is
unimplemented on Windows, returning -1).
"process/user" -- Username under which the tor process is running,
providing an empty string if none exists (this is unimplemented on
Windows, returning an empty string).
"process/descriptor-limit" -- Upper bound on the file descriptor limit, -1
if unknown.
"dir/status-vote/current/consensus" [added in Tor 0.2.1.6-alpha]
"dir/status/authority"
"dir/status/fp/<F>"
"dir/status/fp/<F1>+<F2>+<F3>"
"dir/status/all"
"dir/server/fp/<F>"
"dir/server/fp/<F1>+<F2>+<F3>"
"dir/server/d/<D>"
"dir/server/d/<D1>+<D2>+<D3>"
"dir/server/authority"
"dir/server/all"
A series of lines listing directory contents, provided according to the
specification for the URLs listed in Section 4.4 of dir-spec.txt. Note
that Tor MUST NOT provide private information, such as descriptors for
routers not marked as general-purpose. When asked for 'authority'
information for which this Tor is not authoritative, Tor replies with
an empty string.
Note that, as of Tor 0.2.3.3-alpha, Tor clients don't download server
descriptors anymore, but microdescriptors. So, a "551 Servers
unavailable" reply to all "GETINFO dir/server/*" requests is actually
correct. If you have an old program which absolutely requires server
descriptors to work, try setting UseMicrodescriptors 0 or
FetchUselessDescriptors 1 in your client's torrc.
"status/circuit-established"
"status/enough-dir-info"
"status/good-server-descriptor"
"status/accepted-server-descriptor"
"status/..."
These provide the current internal Tor values for various Tor
states. See Section 4.1.10 for explanations. (Only a few of the
status events are available as getinfo's currently. Let us know if
you want more exposed.)
"status/reachability-succeeded/or"
0 or 1, depending on whether we've found our ORPort reachable.
"status/reachability-succeeded/dir"
0 or 1, depending on whether we've found our DirPort reachable.
"status/reachability-succeeded"
"OR=" ("0"/"1") SP "DIR=" ("0"/"1")
Combines status/reachability-succeeded/*; controllers MUST ignore
unrecognized elements in this entry.
"status/bootstrap-phase"
Returns the most recent bootstrap phase status event
sent. Specifically, it returns a string starting with either
"NOTICE BOOTSTRAP ..." or "WARN BOOTSTRAP ...". Controllers should
use this getinfo when they connect or attach to Tor to learn its
current bootstrap state.
"status/version/recommended"
List of currently recommended versions.
"status/version/current"
Status of the current version. One of: new, old, unrecommended,
recommended, new in series, obsolete, unknown.
"status/version/num-concurring"
"status/version/num-versioning"
These options are deprecated; they no longer give useful information.
"status/clients-seen"
A summary of which countries we've seen clients from recently,
formatted the same as the CLIENTS_SEEN status event described in
Section 4.1.14. This GETINFO option is currently available only
for bridge relays.
"status/fresh-relay-descs"
Provides fresh server and extra-info descriptors for our relay. Note
this is *not* the latest descriptors we've published, but rather what we
would generate if we needed to make a new descriptor right now.
"net/listeners/or"
"net/listeners/dir"
"net/listeners/socks"
"net/listeners/trans"
"net/listeners/natd"
"net/listeners/dns"
"net/listeners/control"
A quoted, space-separated list of the locations where Tor is listening
for connections of the specified type. These can contain IPv4
network address...
"127.0.0.1:9050" "127.0.0.1:9051"
... or local unix sockets...
"unix:/home/my_user/.tor/socket"
... or IPv6 network addresses:
"[2001:0db8:7000:0000:0000:dead:beef:1234]:9050"
[New in Tor 0.2.2.26-beta.]
"dir-usage"
A newline-separated list of how many bytes we've served to answer
each type of directory request. The format of each line is:
Keyword 1*SP Integer 1*SP Integer
where the first integer is the number of bytes written, and the second
is the number of requests answered.
"bw-event-cache"
A space-separated summary of recent BW events in chronological order
from oldest to newest. Each event is represented by a comma-separated
tuple of "R,W", R is the number of bytes read, and W is the number of
bytes written. These entries each represent about one second's worth
of traffic.
[New in Tor 0.2.6.3-alpha]
"consensus/valid-after"
"consensus/fresh-until"
"consensus/valid-until"
Each of these produces an ISOTime describing part of the lifetime of
the current (valid, accepted) consensus that Tor has.
[New in Tor 0.2.6.3-alpha]
"hs/client/desc/id/<ADDR>"
Prints the content of the hidden service descriptor corresponding to
the given <ADDR> which is an onion address without the ".onion" part.
The client's cache is queried to find the descriptor. The format of
the descriptor is described in section 1.3 of the rend-spec.txt
document.
If <ADDR> is unrecognized or if not found in the cache, a 551 error is
returned.
[New in Tor 0.2.7.1-alpha]
"hs/service/desc/id/<ADDR>"
Prints the content of the hidden service descriptor corresponding to
the given <ADDR> which is an onion address without the ".onion" part.
The service's local descriptor cache is queried to find the descriptor.
The format of the descriptor is described in section 1.3 of the
rend-spec.txt document.
If <ADDR> is unrecognized or if not found in the cache, a 551 error is
returned.
[New in Tor 0.2.7.2-alpha]
"onions/current"
"onions/detached"
A newline-separated list of the Onion ("Hidden") Services created
via the "ADD_ONION" command. The 'current' key returns Onion Services
belonging to the current control connection. The 'detached' key
returns Onion Services detached from the parent control connection
(as in, belonging to no control connection).
The format of each line is:
HSAddress
[New in Tor 0.2.7.1-alpha.]
"network-liveness"
The string "up" or "down", indicating whether we currently believe the
network is reachable.
Examples:
C: GETINFO version desc/name/moria1
S: 250+desc/name/moria=
S: [Descriptor for moria]
S: .
S: 250-version=Tor 0.1.1.0-alpha-cvs
S: 250 OK
3.10. EXTENDCIRCUIT
Sent from the client to the server. The format is:
"EXTENDCIRCUIT" SP CircuitID
[SP ServerSpec *("," ServerSpec)]
[SP "purpose=" Purpose] CRLF
This request takes one of two forms: either the CircuitID is zero, in
which case it is a request for the server to build a new circuit,
or the CircuitID is nonzero, in which case it is a request for the
server to extend an existing circuit with that ID according to the
specified path.
If the CircuitID is 0, the controller has the option of providing
a path for Tor to use to build the circuit. If it does not provide
a path, Tor will select one automatically from high capacity nodes
according to path-spec.txt.
If CircuitID is 0 and "purpose=" is specified, then the circuit's
purpose is set. Two choices are recognized: "general" and
"controller". If not specified, circuits are created as "general".
If the request is successful, the server sends a reply containing a
message body consisting of the CircuitID of the (maybe newly created)
circuit. The syntax is "250" SP "EXTENDED" SP CircuitID CRLF.
3.11. SETCIRCUITPURPOSE
Sent from the client to the server. The format is:
"SETCIRCUITPURPOSE" SP CircuitID SP "purpose=" Purpose CRLF
This changes the circuit's purpose. See EXTENDCIRCUIT above for details.
3.12. SETROUTERPURPOSE
Sent from the client to the server. The format is:
"SETROUTERPURPOSE" SP NicknameOrKey SP Purpose CRLF
This changes the descriptor's purpose. See +POSTDESCRIPTOR below
for details.
NOTE: This command was disabled and made obsolete as of Tor
0.2.0.8-alpha. It doesn't exist anymore, and is listed here only for
historical interest.
3.13. ATTACHSTREAM
Sent from the client to the server. The syntax is:
"ATTACHSTREAM" SP StreamID SP CircuitID [SP "HOP=" HopNum] CRLF
This message informs the server that the specified stream should be
associated with the specified circuit. Each stream may be associated with
at most one circuit, and multiple streams may share the same circuit.
Streams can only be attached to completed circuits (that is, circuits that
have sent a circuit status 'BUILT' event or are listed as built in a
GETINFO circuit-status request).
If the circuit ID is 0, responsibility for attaching the given stream is
returned to Tor.
If HOP=HopNum is specified, Tor will choose the HopNumth hop in the
circuit as the exit node, rather than the last node in the circuit.
Hops are 1-indexed; generally, it is not permitted to attach to hop 1.
Tor responds with "250 OK" if it can attach the stream, 552 if the
circuit or stream didn't exist, 555 if the stream isn't in an
appropriate state to be attached (e.g. it's already open), or 551 if
the stream couldn't be attached for another reason.
{Implementation note: Tor will close unattached streams by itself,
roughly two minutes after they are born. Let the developers know if
that turns out to be a problem.}
{Implementation note: By default, Tor automatically attaches streams to
circuits itself, unless the configuration variable
"__LeaveStreamsUnattached" is set to "1". Attempting to attach streams
via TC when "__LeaveStreamsUnattached" is false may cause a race between
Tor and the controller, as both attempt to attach streams to circuits.}
{Implementation note: You can try to attachstream to a stream that
has already sent a connect or resolve request but hasn't succeeded
yet, in which case Tor will detach the stream from its current circuit
before proceeding with the new attach request.}
3.14. POSTDESCRIPTOR
Sent from the client to the server. The syntax is:
"+POSTDESCRIPTOR" [SP "purpose=" Purpose] [SP "cache=" Cache]
CRLF Descriptor CRLF "." CRLF
This message informs the server about a new descriptor. If Purpose is
specified, it must be either "general", "controller", or "bridge",
else we return a 552 error. The default is "general".
If Cache is specified, it must be either "no" or "yes", else we
return a 552 error. If Cache is not specified, Tor will decide for
itself whether it wants to cache the descriptor, and controllers
must not rely on its choice.
The descriptor, when parsed, must contain a number of well-specified
fields, including fields for its nickname and identity.
If there is an error in parsing the descriptor, the server must send a
"554 Invalid descriptor" reply. If the descriptor is well-formed but
the server chooses not to add it, it must reply with a 251 message