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- // Copyright (c) 2016-2017, The Tor Project, Inc. */
- // See LICENSE for licensing information */
- use std::collections::HashMap;
- use std::collections::hash_map;
- use std::ffi::CStr;
- use std::fmt;
- use std::str;
- use std::str::FromStr;
- use std::string::String;
- use tor_log::{LogSeverity, LogDomain};
- use external::c_tor_version_as_new_as;
- use errors::ProtoverError;
- use protoset::Version;
- use protoset::ProtoSet;
- /// The first version of Tor that included "proto" entries in its descriptors.
- /// Authorities should use this to decide whether to guess proto lines.
- ///
- /// C_RUST_COUPLED:
- /// src/or/protover.h `FIRST_TOR_VERSION_TO_ADVERTISE_PROTOCOLS`
- const FIRST_TOR_VERSION_TO_ADVERTISE_PROTOCOLS: &'static str = "0.2.9.3-alpha";
- /// The maximum number of subprotocol version numbers we will attempt to expand
- /// before concluding that someone is trying to DoS us
- ///
- /// C_RUST_COUPLED: src/or/protover.c `MAX_PROTOCOLS_TO_EXPAND`
- pub(crate) const MAX_PROTOCOLS_TO_EXPAND: usize = (1<<16);
- /// Known subprotocols in Tor. Indicates which subprotocol a relay supports.
- ///
- /// C_RUST_COUPLED: src/or/protover.h `protocol_type_t`
- #[derive(Clone, Hash, Eq, PartialEq, Debug)]
- pub enum Protocol {
- Cons,
- Desc,
- DirCache,
- HSDir,
- HSIntro,
- HSRend,
- Link,
- LinkAuth,
- Microdesc,
- Relay,
- }
- impl fmt::Display for Protocol {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- write!(f, "{:?}", self)
- }
- }
- /// Translates a string representation of a protocol into a Proto type.
- /// Error if the string is an unrecognized protocol name.
- ///
- /// C_RUST_COUPLED: src/or/protover.c `PROTOCOL_NAMES`
- impl FromStr for Protocol {
- type Err = ProtoverError;
- fn from_str(s: &str) -> Result<Self, Self::Err> {
- match s {
- "Cons" => Ok(Protocol::Cons),
- "Desc" => Ok(Protocol::Desc),
- "DirCache" => Ok(Protocol::DirCache),
- "HSDir" => Ok(Protocol::HSDir),
- "HSIntro" => Ok(Protocol::HSIntro),
- "HSRend" => Ok(Protocol::HSRend),
- "Link" => Ok(Protocol::Link),
- "LinkAuth" => Ok(Protocol::LinkAuth),
- "Microdesc" => Ok(Protocol::Microdesc),
- "Relay" => Ok(Protocol::Relay),
- _ => Err(ProtoverError::UnknownProtocol),
- }
- }
- }
- /// A protocol string which is not one of the `Protocols` we currently know
- /// about.
- #[derive(Clone, Debug, Hash, Eq, PartialEq)]
- pub struct UnknownProtocol(String);
- impl fmt::Display for UnknownProtocol {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- write!(f, "{}", self.0)
- }
- }
- impl FromStr for UnknownProtocol {
- type Err = ProtoverError;
- fn from_str(s: &str) -> Result<Self, Self::Err> {
- Ok(UnknownProtocol(s.to_string()))
- }
- }
- impl From<Protocol> for UnknownProtocol {
- fn from(p: Protocol) -> UnknownProtocol {
- UnknownProtocol(p.to_string())
- }
- }
- /// Get a CStr representation of current supported protocols, for
- /// passing to C, or for converting to a `&str` for Rust.
- ///
- /// # Returns
- ///
- /// An `&'static CStr` whose value is the existing protocols supported by tor.
- /// Returned data is in the format as follows:
- ///
- /// "HSDir=1-1 LinkAuth=1"
- ///
- /// # Note
- ///
- /// Rust code can use the `&'static CStr` as a normal `&'a str` by
- /// calling `protover::get_supported_protocols`.
- ///
- // C_RUST_COUPLED: src/or/protover.c `protover_get_supported_protocols`
- pub(crate) fn get_supported_protocols_cstr() -> &'static CStr {
- cstr!("Cons=1-2 \
- Desc=1-2 \
- DirCache=1-2 \
- HSDir=1-2 \
- HSIntro=3-4 \
- HSRend=1-2 \
- Link=1-5 \
- LinkAuth=1,3 \
- Microdesc=1-2 \
- Relay=1-2")
- }
- /// A map of protocol names to the versions of them which are supported.
- #[derive(Clone, Debug, PartialEq, Eq)]
- pub struct ProtoEntry(HashMap<Protocol, ProtoSet>);
- impl Default for ProtoEntry {
- fn default() -> ProtoEntry {
- ProtoEntry( HashMap::new() )
- }
- }
- impl ProtoEntry {
- /// Get an iterator over the `Protocol`s and their `ProtoSet`s in this `ProtoEntry`.
- pub fn iter(&self) -> hash_map::Iter<Protocol, ProtoSet> {
- self.0.iter()
- }
- /// Translate the supported tor versions from a string into a
- /// ProtoEntry, which is useful when looking up a specific
- /// subprotocol.
- pub fn supported() -> Result<Self, ProtoverError> {
- let supported_cstr: &'static CStr = get_supported_protocols_cstr();
- let supported: &str = supported_cstr.to_str().unwrap_or("");
- supported.parse()
- }
- pub fn get(&self, protocol: &Protocol) -> Option<&ProtoSet> {
- self.0.get(protocol)
- }
- pub fn insert(&mut self, key: Protocol, value: ProtoSet) {
- self.0.insert(key, value);
- }
- pub fn remove(&mut self, key: &Protocol) -> Option<ProtoSet> {
- self.0.remove(key)
- }
- pub fn is_empty(&self) -> bool {
- self.0.is_empty()
- }
- }
- impl FromStr for ProtoEntry {
- type Err = ProtoverError;
- /// Parse a string of subprotocol types and their version numbers.
- ///
- /// # Inputs
- ///
- /// * A `protocol_entry` string, comprised of a keywords, an "=" sign, and
- /// one or more version numbers, each separated by a space. For example,
- /// `"Cons=3-4 HSDir=1"`.
- ///
- /// # Returns
- ///
- /// A `Result` whose `Ok` value is a `ProtoEntry`, where the
- /// first element is the subprotocol type (see `protover::Protocol`) and the last
- /// element is an ordered set of `(low, high)` unique version numbers which are supported.
- /// Otherwise, the `Err` value of this `Result` is a `ProtoverError`.
- fn from_str(protocol_entry: &str) -> Result<ProtoEntry, ProtoverError> {
- let mut proto_entry: ProtoEntry = ProtoEntry::default();
- let entries = protocol_entry.split(' ');
- for entry in entries {
- let mut parts = entry.splitn(2, '=');
- let proto = match parts.next() {
- Some(n) => n,
- None => return Err(ProtoverError::Unparseable),
- };
- let vers = match parts.next() {
- Some(n) => n,
- None => return Err(ProtoverError::Unparseable),
- };
- let versions: ProtoSet = vers.parse()?;
- let proto_name: Protocol = proto.parse()?;
- proto_entry.insert(proto_name, versions);
- }
- Ok(proto_entry)
- }
- }
- /// Parses a single subprotocol entry string into subprotocol and version
- /// parts, and then checks whether any of those versions are unsupported.
- /// Helper for protover::all_supported
- ///
- /// # Inputs
- ///
- /// Accepted data is in the string format as follows:
- ///
- /// "HSDir=1-1"
- ///
- /// # Returns
- ///
- /// Returns `true` if the protocol entry is well-formatted and only contains
- /// versions that are also supported in tor. Otherwise, returns false
- ///
- fn contains_only_supported_protocols(proto_entry: &str) -> bool {
- let (name, mut vers) = match get_proto_and_vers(proto_entry) {
- Ok(n) => n,
- Err("Too many versions to expand") => {
- tor_log_msg!(
- LogSeverity::Warn,
- LogDomain::Net,
- "get_versions",
- "When expanding a protocol list from an authority, I \
- got too many protocols. This is possibly an attack or a bug, \
- unless the Tor network truly has expanded to support over {} \
- different subprotocol versions. The offending string was: {}",
- MAX_PROTOCOLS_TO_EXPAND,
- proto_entry
- );
- return false;
- }
- Err(_) => return false,
- };
- let currently_supported = match SupportedProtocols::tor_supported() {
- Ok(n) => n.0,
- Err(_) => return false,
- };
- let supported_versions = match currently_supported.get(&name) {
- Some(n) => n,
- None => return false,
- };
- vers.0.retain(|x| !supported_versions.0.contains(x));
- vers.0.is_empty()
- }
- /// Determine if we support every protocol a client supports, and if not,
- /// determine which protocols we do not have support for.
- ///
- /// # Inputs
- ///
- /// Accepted data is in the string format as follows:
- ///
- /// "HSDir=1-1 LinkAuth=1-2"
- ///
- /// # Returns
- ///
- /// Return `true` if every protocol version is one that we support.
- /// Otherwise, return `false`.
- /// Optionally, return parameters which the client supports but which we do not
- ///
- /// # Examples
- /// ```
- /// use protover::all_supported;
- ///
- /// let (is_supported, unsupported) = all_supported("Link=1");
- /// assert_eq!(true, is_supported);
- ///
- /// let (is_supported, unsupported) = all_supported("Link=5-6");
- /// assert_eq!(false, is_supported);
- /// assert_eq!("Link=5-6", unsupported);
- ///
- pub fn all_supported(protocols: &str) -> (bool, String) {
- let unsupported = protocols
- .split_whitespace()
- .filter(|v| !contains_only_supported_protocols(v))
- .collect::<Vec<&str>>();
- (unsupported.is_empty(), unsupported.join(" "))
- }
- /// Return true iff the provided protocol list includes support for the
- /// indicated protocol and version.
- /// Otherwise, return false
- ///
- /// # Inputs
- ///
- /// * `list`, a string representation of a list of protocol entries.
- /// * `proto`, a `Proto` to test support for
- /// * `vers`, a `Version` version which we will go on to determine whether the
- /// specified protocol supports.
- ///
- /// # Examples
- /// ```
- /// use protover::*;
- ///
- /// let is_supported = protover_string_supports_protocol("Link=3-4 Cons=1",
- /// Proto::Cons,1);
- /// assert_eq!(true, is_supported);
- ///
- /// let is_not_supported = protover_string_supports_protocol("Link=3-4 Cons=1",
- /// Proto::Cons,5);
- /// assert_eq!(false, is_not_supported)
- /// ```
- pub fn protover_string_supports_protocol(
- list: &str,
- proto: Proto,
- vers: Version,
- ) -> bool {
- let supported = match SupportedProtocols::from_proto_entries_string(list) {
- Ok(result) => result.0,
- Err(_) => return false,
- };
- let supported_versions = match supported.get(&proto) {
- Some(n) => n,
- None => return false,
- };
- supported_versions.0.contains(&vers)
- }
- /// As protover_string_supports_protocol(), but also returns True if
- /// any later version of the protocol is supported.
- ///
- /// # Examples
- /// ```
- /// use protover::*;
- ///
- /// let is_supported = protover_string_supports_protocol_or_later(
- /// "Link=3-4 Cons=5", Proto::Cons, 5);
- ///
- /// assert_eq!(true, is_supported);
- ///
- /// let is_supported = protover_string_supports_protocol_or_later(
- /// "Link=3-4 Cons=5", Proto::Cons, 4);
- ///
- /// assert_eq!(true, is_supported);
- ///
- /// let is_supported = protover_string_supports_protocol_or_later(
- /// "Link=3-4 Cons=5", Proto::Cons, 6);
- ///
- /// assert_eq!(false, is_supported);
- /// ```
- pub fn protover_string_supports_protocol_or_later(
- list: &str,
- proto: Proto,
- vers: u32,
- ) -> bool {
- let supported = match SupportedProtocols::from_proto_entries_string(list) {
- Ok(result) => result.0,
- Err(_) => return false,
- };
- let supported_versions = match supported.get(&proto) {
- Some(n) => n,
- None => return false,
- };
- supported_versions.0.iter().any(|v| v >= &vers)
- }
- /// Parses a protocol list without validating the protocol names
- ///
- /// # Inputs
- ///
- /// * `protocol_string`, a string comprised of keys and values, both which are
- /// strings. The keys are the protocol names while values are a string
- /// representation of the supported versions.
- ///
- /// The input is _not_ expected to be a subset of the Proto types
- ///
- /// # Returns
- ///
- /// A `Result` whose `Ok` value is a `HashSet<Version>` holding all of the
- /// unique version numbers.
- ///
- /// The returned `Result`'s `Err` value is an `&'static str` with a description
- /// of the error.
- ///
- /// # Errors
- ///
- /// This function will error if:
- ///
- /// * The protocol string does not follow the "protocol_name=version_list"
- /// expected format
- /// * If the version string is malformed. See `Versions::from_version_string`.
- ///
- fn parse_protocols_from_string_with_no_validation<'a>(
- protocol_string: &'a str,
- ) -> Result<HashMap<String, Versions>, &'static str> {
- let mut parsed: HashMap<String, Versions> = HashMap::new();
- for subproto in protocol_string.split(" ") {
- let mut parts = subproto.splitn(2, "=");
- let name = match parts.next() {
- Some("") => return Err("invalid protover entry"),
- Some(n) => n,
- None => return Err("invalid protover entry"),
- };
- let vers = match parts.next() {
- Some(n) => n,
- None => return Err("invalid protover entry"),
- };
- let versions = Versions::from_version_string(vers)?;
- parsed.insert(String::from(name), versions);
- }
- Ok(parsed)
- }
- /// Protocol voting implementation.
- ///
- /// Given a list of strings describing protocol versions, return a new
- /// string encoding all of the protocols that are listed by at
- /// least threshold of the inputs.
- ///
- /// The string is sorted according to the following conventions:
- /// - Protocols names are alphabetized
- /// - Protocols are in order low to high
- /// - Individual and ranges are listed together. For example,
- /// "3, 5-10,13"
- /// - All entries are unique
- ///
- /// # Examples
- /// ```
- /// use protover::compute_vote;
- ///
- /// let protos = vec![String::from("Link=3-4"), String::from("Link=3")];
- /// let vote = compute_vote(protos, 2);
- /// assert_eq!("Link=3", vote)
- /// ```
- pub fn compute_vote(
- list_of_proto_strings: Vec<String>,
- threshold: i32,
- ) -> String {
- let empty = String::from("");
- if list_of_proto_strings.is_empty() {
- return empty;
- }
- // all_count is a structure to represent the count of the number of
- // supported versions for a specific protocol. For example, in JSON format:
- // {
- // "FirstSupportedProtocol": {
- // "1": "3",
- // "2": "1"
- // }
- // }
- // means that FirstSupportedProtocol has three votes which support version
- // 1, and one vote that supports version 2
- let mut all_count: HashMap<String, HashMap<Version, usize>> =
- HashMap::new();
- // parse and collect all of the protos and their versions and collect them
- for vote in list_of_proto_strings {
- let this_vote: HashMap<String, Versions> =
- match parse_protocols_from_string_with_no_validation(&vote) {
- Ok(result) => result,
- Err(_) => continue,
- };
- for (protocol, versions) in this_vote {
- let supported_vers: &mut HashMap<Version, usize> =
- all_count.entry(protocol).or_insert(HashMap::new());
- for version in versions.0 {
- let counter: &mut usize =
- supported_vers.entry(version).or_insert(0);
- *counter += 1;
- }
- }
- }
- let mut final_output: HashMap<String, String> =
- HashMap::with_capacity(get_supported_protocols().split(" ").count());
- // Go through and remove verstions that are less than the threshold
- for (protocol, versions) in all_count {
- let mut meets_threshold = HashSet::new();
- for (version, count) in versions {
- if count >= threshold as usize {
- meets_threshold.insert(version);
- }
- }
- // For each protocol, compress its version list into the expected
- // protocol version string format
- let contracted = contract_protocol_list(&meets_threshold);
- if !contracted.is_empty() {
- final_output.insert(protocol, contracted);
- }
- }
- write_vote_to_string(&final_output)
- }
- /// Return a String comprised of protocol entries in alphabetical order
- ///
- /// # Inputs
- ///
- /// * `vote`, a `HashMap` comprised of keys and values, both which are strings.
- /// The keys are the protocol names while values are a string representation of
- /// the supported versions.
- ///
- /// # Returns
- ///
- /// A `String` whose value is series of pairs, comprising of the protocol name
- /// and versions that it supports. The string takes the following format:
- ///
- /// "first_protocol_name=1,2-5, second_protocol_name=4,5"
- ///
- /// Sorts the keys in alphabetical order and creates the expected subprotocol
- /// entry format.
- ///
- fn write_vote_to_string(vote: &HashMap<String, String>) -> String {
- let mut keys: Vec<&String> = vote.keys().collect();
- keys.sort();
- let mut output = Vec::new();
- for key in keys {
- // TODO error in indexing here?
- output.push(format!("{}={}", key, vote[key]));
- }
- output.join(" ")
- }
- /// Returns a boolean indicating whether the given protocol and version is
- /// supported in any of the existing Tor protocols
- ///
- /// # Examples
- /// ```
- /// use protover::*;
- ///
- /// let is_supported = is_supported_here(Proto::Link, 10);
- /// assert_eq!(false, is_supported);
- ///
- /// let is_supported = is_supported_here(Proto::Link, 1);
- /// assert_eq!(true, is_supported);
- /// ```
- pub fn is_supported_here(proto: Proto, vers: Version) -> bool {
- let currently_supported = match SupportedProtocols::tor_supported() {
- Ok(result) => result.0,
- Err(_) => return false,
- };
- let supported_versions = match currently_supported.get(&proto) {
- Some(n) => n,
- None => return false,
- };
- supported_versions.0.contains(&vers)
- }
- /// Older versions of Tor cannot infer their own subprotocols
- /// Used to determine which subprotocols are supported by older Tor versions.
- ///
- /// # Inputs
- ///
- /// * `version`, a string comprised of "[0-9a-z.-]"
- ///
- /// # Returns
- ///
- /// A `&'static CStr` encoding a list of protocol names and supported
- /// versions. The string takes the following format:
- ///
- /// "HSDir=1-1 LinkAuth=1"
- ///
- /// This function returns the protocols that are supported by the version input,
- /// only for tor versions older than FIRST_TOR_VERSION_TO_ADVERTISE_PROTOCOLS.
- ///
- /// C_RUST_COUPLED: src/rust/protover.c `compute_for_old_tor`
- pub fn compute_for_old_tor(version: &str) -> &'static CStr {
- let empty: &'static CStr = cstr!("");
- if c_tor_version_as_new_as(version, FIRST_TOR_VERSION_TO_ADVERTISE_PROTOCOLS) {
- return empty;
- }
- if c_tor_version_as_new_as(version, "0.2.9.1-alpha") {
- return cstr!("Cons=1-2 Desc=1-2 DirCache=1 HSDir=1 HSIntro=3 HSRend=1-2 \
- Link=1-4 LinkAuth=1 Microdesc=1-2 Relay=1-2");
- }
- if c_tor_version_as_new_as(version, "0.2.7.5") {
- return cstr!("Cons=1-2 Desc=1-2 DirCache=1 HSDir=1 HSIntro=3 HSRend=1 \
- Link=1-4 LinkAuth=1 Microdesc=1-2 Relay=1-2");
- }
- if c_tor_version_as_new_as(version, "0.2.4.19") {
- return cstr!("Cons=1 Desc=1 DirCache=1 HSDir=1 HSIntro=3 HSRend=1 \
- Link=1-4 LinkAuth=1 Microdesc=1 Relay=1-2");
- }
- empty
- }
- #[cfg(test)]
- mod test {
- use std::str::FromStr;
- use std::string::ToString;
- use super::*;
- #[test]
- fn test_versions_from_version_string() {
- use std::collections::HashSet;
- use super::Versions;
- assert_eq!(Err("invalid protocol entry"), Versions::from_version_string("a,b"));
- assert_eq!(Err("invalid protocol entry"), Versions::from_version_string("1,!"));
- {
- let mut versions: HashSet<Version> = HashSet::new();
- versions.insert(1);
- assert_eq!(versions, Versions::from_version_string("1").unwrap().0);
- }
- {
- let mut versions: HashSet<Version> = HashSet::new();
- versions.insert(1);
- versions.insert(2);
- assert_eq!(versions, Versions::from_version_string("1,2").unwrap().0);
- }
- {
- let mut versions: HashSet<Version> = HashSet::new();
- versions.insert(1);
- versions.insert(2);
- versions.insert(3);
- assert_eq!(versions, Versions::from_version_string("1-3").unwrap().0);
- }
- {
- let mut versions: HashSet<Version> = HashSet::new();
- versions.insert(1);
- versions.insert(2);
- versions.insert(5);
- assert_eq!(versions, Versions::from_version_string("1-2,5").unwrap().0);
- }
- {
- let mut versions: HashSet<Version> = HashSet::new();
- versions.insert(1);
- versions.insert(3);
- versions.insert(4);
- versions.insert(5);
- assert_eq!(versions, Versions::from_version_string("1,3-5").unwrap().0);
- }
- }
- #[test]
- fn test_contains_only_supported_protocols() {
- use super::contains_only_supported_protocols;
- assert_eq!(false, contains_only_supported_protocols(""));
- assert_eq!(true, contains_only_supported_protocols("Cons="));
- assert_eq!(true, contains_only_supported_protocols("Cons=1"));
- assert_eq!(false, contains_only_supported_protocols("Cons=0"));
- assert_eq!(false, contains_only_supported_protocols("Cons=0-1"));
- assert_eq!(false, contains_only_supported_protocols("Cons=5"));
- assert_eq!(false, contains_only_supported_protocols("Cons=1-5"));
- assert_eq!(false, contains_only_supported_protocols("Cons=1,5"));
- assert_eq!(false, contains_only_supported_protocols("Cons=5,6"));
- assert_eq!(false, contains_only_supported_protocols("Cons=1,5,6"));
- assert_eq!(true, contains_only_supported_protocols("Cons=1,2"));
- assert_eq!(true, contains_only_supported_protocols("Cons=1-2"));
- }
- #[test]
- fn test_find_range() {
- use super::find_range;
- assert_eq!((false, 0), find_range(&vec![]));
- assert_eq!((false, 1), find_range(&vec![1]));
- assert_eq!((true, 2), find_range(&vec![1, 2]));
- assert_eq!((true, 3), find_range(&vec![1, 2, 3]));
- assert_eq!((true, 3), find_range(&vec![1, 2, 3, 5]));
- }
- #[test]
- fn test_expand_version_range() {
- use super::expand_version_range;
- assert_eq!(Err("version string empty"), expand_version_range(""));
- assert_eq!(Ok(1..3), expand_version_range("1-2"));
- assert_eq!(Ok(1..5), expand_version_range("1-4"));
- assert_eq!(
- Err("cannot parse protocol range lower bound"),
- expand_version_range("a")
- );
- assert_eq!(
- Err("cannot parse protocol range upper bound"),
- expand_version_range("1-a")
- );
- assert_eq!(Ok(1000..66536), expand_version_range("1000-66535"));
- assert_eq!(Err("Too many protocols in expanded range"),
- expand_version_range("1000-66536"));
- }
- #[test]
- fn test_contract_protocol_list() {
- use std::collections::HashSet;
- use super::contract_protocol_list;
- {
- let mut versions = HashSet::<Version>::new();
- assert_eq!(String::from(""), contract_protocol_list(&versions));
- versions.insert(1);
- assert_eq!(String::from("1"), contract_protocol_list(&versions));
- versions.insert(2);
- assert_eq!(String::from("1-2"), contract_protocol_list(&versions));
- }
- {
- let mut versions = HashSet::<Version>::new();
- versions.insert(1);
- versions.insert(3);
- assert_eq!(String::from("1,3"), contract_protocol_list(&versions));
- }
- {
- let mut versions = HashSet::<Version>::new();
- versions.insert(1);
- versions.insert(2);
- versions.insert(3);
- versions.insert(4);
- assert_eq!(String::from("1-4"), contract_protocol_list(&versions));
- }
- {
- let mut versions = HashSet::<Version>::new();
- versions.insert(1);
- versions.insert(3);
- versions.insert(5);
- versions.insert(6);
- versions.insert(7);
- assert_eq!(
- String::from("1,3,5-7"),
- contract_protocol_list(&versions)
- );
- }
- {
- let mut versions = HashSet::<Version>::new();
- versions.insert(1);
- versions.insert(2);
- versions.insert(3);
- versions.insert(500);
- assert_eq!(
- String::from("1-3,500"),
- contract_protocol_list(&versions)
- );
- }
- }
- }
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