-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
---
+--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local prosody = _G.prosody;
local hosts = prosody.hosts;
-local incoming_s2s = prosody.incoming_s2s;
local console_listener = { default_port = 5582; default_mode = "*a"; interface = "127.0.0.1" };
local iterators = require "util.iterators";
local keys, values = iterators.keys, iterators.values;
-local jid_bare, jid_split = import("util.jid", "bare", "prepped_split");
+local jid_bare, jid_split, jid_join = import("util.jid", "bare", "prepped_split", "join");
local set, array = require "util.set", require "util.array";
local cert_verify_identity = require "util.x509".verify_identity;
local envload = require "util.envload".envload;
local envloadfile = require "util.envload".envloadfile;
+local has_pposix, pposix = pcall(require, "util.pposix");
local commands = module:shared("commands")
local def_env = module:shared("env");
disconnect = function () conn:close(); end;
};
session.env = setmetatable({}, default_env_mt);
-
+
-- Load up environment with helper objects
for name, t in pairs(def_env) do
if type(t) == "table" then
session.env[name] = setmetatable({ session = session }, { __index = t });
end
end
-
+
return session;
end
function console:process_line(session, line)
local useglobalenv;
-
+
if line:match("^>") then
line = line:gsub("^>", "");
useglobalenv = true;
return;
end
end
-
+
session.env._ = line;
-
+
local chunkname = "=console";
local env = (useglobalenv and redirect_output(_G, session)) or session.env or nil
local chunk, err = envload("return "..line, chunkname, env);
return;
end
end
-
+
local ranok, taskok, message = pcall(chunk);
-
+
if not (ranok or message or useglobalenv) and commands[line:lower()] then
commands[line:lower()](session, line);
return;
end
-
+
if not ranok then
session.print("Fatal error while running command, it did not complete");
session.print("Error: "..taskok);
return;
end
-
+
if not message then
session.print("Result: "..tostring(taskok));
return;
session.print("Message: "..tostring(message));
return;
end
-
+
session.print("OK: "..tostring(message));
end
session.partial_data = data:match("[^\n]+$");
end
+function console_listener.onreadtimeout(conn)
+ local session = sessions[conn];
+ if session then
+ session.send("\0");
+ return true;
+ end
+end
+
function console_listener.ondisconnect(conn, err)
local session = sessions[conn];
if session then
print [[c2s:show(jid) - Show all client sessions with the specified JID (or all if no JID given)]]
print [[c2s:show_insecure() - Show all unencrypted client connections]]
print [[c2s:show_secure() - Show all encrypted client connections]]
+ print [[c2s:show_tls() - Show TLS cipher info for encrypted sessions]]
print [[c2s:close(jid) - Close all sessions for the specified JID]]
elseif section == "s2s" then
print [[s2s:show(domain) - Show all s2s connections for the given domain (or all if no domain given)]]
+ print [[s2s:show_tls(domain) - Show TLS cipher info for encrypted sessions]]
print [[s2s:close(from, to) - Close a connection from one domain to another]]
print [[s2s:closeall(host) - Close all the incoming/outgoing s2s sessions to specified host]]
elseif section == "module" then
-- Session environment --
-- Anything in def_env will be accessible within the session as a global variable
+--luacheck: ignore 212/self
+
def_env.server = {};
function def_env.server:insane_reload()
end
function def_env.server:memory()
- local pposix = require("util.pposix");
- if not pposix.meminfo then
+ if not has_pposix or not pposix.meminfo then
return true, "Lua is using "..collectgarbage("count");
end
local mem, lua_mem = pposix.meminfo(), collectgarbage("count");
elseif type(hosts) == "string" then
return set.new { hosts };
elseif hosts == nil then
- local mm = require "modulemanager";
local hosts_set = set.new(array.collect(keys(prosody.hosts)))
- / function (host) return (prosody.hosts[host].type == "local" or module and mm.is_loaded(host, module)) and host or nil; end;
- if module and mm.get_module("*", module) then
+ / function (host) return (prosody.hosts[host].type == "local" or module and modulemanager.is_loaded(host, module)) and host or nil; end;
+ if module and modulemanager.get_module("*", module) then
hosts_set:add("*");
end
return hosts_set;
end
function def_env.module:load(name, hosts, config)
- local mm = require "modulemanager";
-
hosts = get_hosts_set(hosts);
-
+
-- Load the module for each host
local ok, err, count, mod = true, nil, 0, nil;
for host in hosts do
- if (not mm.is_loaded(host, name)) then
- mod, err = mm.load(host, name, config);
+ if (not modulemanager.is_loaded(host, name)) then
+ mod, err = modulemanager.load(host, name, config);
if not mod then
ok = false;
if err == "global-module-already-loaded" then
end
end
end
-
- return ok, (ok and "Module loaded onto "..count.." host"..(count ~= 1 and "s" or "")) or ("Last error: "..tostring(err));
+
+ return ok, (ok and "Module loaded onto "..count.." host"..(count ~= 1 and "s" or "")) or ("Last error: "..tostring(err));
end
function def_env.module:unload(name, hosts)
- local mm = require "modulemanager";
-
hosts = get_hosts_set(hosts, name);
-
+
-- Unload the module for each host
local ok, err, count = true, nil, 0;
for host in hosts do
- if mm.is_loaded(host, name) then
- ok, err = mm.unload(host, name);
+ if modulemanager.is_loaded(host, name) then
+ ok, err = modulemanager.unload(host, name);
if not ok then
ok = false;
self.session.print(err or "Unknown error unloading module");
end
function def_env.module:reload(name, hosts)
- local mm = require "modulemanager";
-
hosts = array.collect(get_hosts_set(hosts, name)):sort(function (a, b)
if a == "*" then return true
elseif b == "*" then return false
-- Reload the module for each host
local ok, err, count = true, nil, 0;
for _, host in ipairs(hosts) do
- if mm.is_loaded(host, name) then
- ok, err = mm.reload(host, name);
+ if modulemanager.is_loaded(host, name) then
+ ok, err = modulemanager.reload(host, name);
if not ok then
ok = false;
self.session.print(err or "Unknown error reloading module");
if type(hosts) ~= "table" then
return false, "Please supply a host or a list of hosts you would like to see";
end
-
+
local print = self.session.print;
for _, host in ipairs(hosts) do
print((host == "*" and "Global" or host)..":");
return ok, (ok and "Config reloaded (you may need to reload modules to take effect)") or tostring(err);
end
-def_env.hosts = {};
-function def_env.hosts:list()
- for host, host_session in pairs(hosts) do
- self.session.print(host);
+local function common_info(session, line)
+ if session.id then
+ line[#line+1] = "["..session.id.."]"
+ else
+ line[#line+1] = "["..session.type..(tostring(session):match("%x*$")).."]"
end
- return true, "Done";
end
-function def_env.hosts:add(name)
+local function session_flags(session, line)
+ line = line or {};
+ common_info(session, line);
+ if session.type == "c2s" then
+ local status, priority = "unavailable", tostring(session.priority or "-");
+ if session.presence then
+ status = session.presence:get_child_text("show") or "available";
+ end
+ line[#line+1] = status.."("..priority..")";
+ end
+ if session.cert_identity_status == "valid" then
+ line[#line+1] = "(authenticated)";
+ end
+ if session.secure then
+ line[#line+1] = "(encrypted)";
+ end
+ if session.compressed then
+ line[#line+1] = "(compressed)";
+ end
+ if session.smacks then
+ line[#line+1] = "(sm)";
+ end
+ if session.ip and session.ip:match(":") then
+ line[#line+1] = "(IPv6)";
+ end
+ if session.remote then
+ line[#line+1] = "(remote)";
+ end
+ return table.concat(line, " ");
+end
+
+local function tls_info(session, line)
+ line = line or {};
+ common_info(session, line);
+ if session.secure then
+ local sock = session.conn and session.conn.socket and session.conn:socket();
+ if sock and sock.info then
+ local info = sock:info();
+ line[#line+1] = ("(%s with %s)"):format(info.protocol, info.cipher);
+ else
+ line[#line+1] = "(cipher info unavailable)";
+ end
+ else
+ line[#line+1] = "(insecure)";
+ end
+ return table.concat(line, " ");
end
def_env.c2s = {};
+local function get_jid(session)
+ if session.username then
+ return session.full_jid or jid_join(session.username, session.host, session.resource);
+ end
+
+ local conn = session.conn;
+ local ip = session.ip or "?";
+ local clientport = conn and conn:clientport() or "?";
+ local serverip = conn and conn.server and conn:server():ip() or "?";
+ local serverport = conn and conn:serverport() or "?"
+ return jid_join("["..ip.."]:"..clientport, session.host or "["..serverip.."]:"..serverport);
+end
+
local function show_c2s(callback)
- for hostname, host in pairs(hosts) do
- for username, user in pairs(host.sessions or {}) do
- for resource, session in pairs(user.sessions or {}) do
- local jid = username.."@"..hostname.."/"..resource;
- callback(jid, session);
+ local c2s = array.collect(values(module:shared"/*/c2s/sessions"));
+ c2s:sort(function(a, b)
+ if a.host == b.host then
+ if a.username == b.username then
+ return (a.resource or "") > (b.resource or "");
end
+ return (a.username or "") > (b.username or "");
end
- end
+ return (a.host or "") > (b.host or "");
+ end):map(function (session)
+ callback(get_jid(session), session)
+ end);
end
function def_env.c2s:count(match_jid)
- local count = 0;
- show_c2s(function (jid, session)
- if (not match_jid) or jid:match(match_jid) then
- count = count + 1;
- end
- end);
- return true, "Total: "..count.." clients";
+ return true, "Total: ".. iterators.count(values(module:shared"/*/c2s/sessions")) .." clients";
end
-function def_env.c2s:show(match_jid)
+function def_env.c2s:show(match_jid, annotate)
local print, count = self.session.print, 0;
- local curr_host;
+ annotate = annotate or session_flags;
+ local curr_host = false;
show_c2s(function (jid, session)
if curr_host ~= session.host then
curr_host = session.host;
- print(curr_host);
+ print(curr_host or "(not connected to any host yet)");
end
if (not match_jid) or jid:match(match_jid) then
count = count + 1;
- local status, priority = "unavailable", tostring(session.priority or "-");
- if session.presence then
- status = session.presence:child_with_name("show");
- if status then
- status = status:get_text() or "[invalid!]";
- else
- status = "available";
- end
- end
- print(" "..jid.." - "..status.."("..priority..")");
- end
+ print(annotate(session, { " ", jid }));
+ end
end);
return true, "Total: "..count.." clients";
end
if ((not match_jid) or jid:match(match_jid)) and not session.secure then
count = count + 1;
print(jid);
- end
+ end
end);
return true, "Total: "..count.." insecure client connections";
end
if ((not match_jid) or jid:match(match_jid)) and session.secure then
count = count + 1;
print(jid);
- end
+ end
end);
return true, "Total: "..count.." secure client connections";
end
+function def_env.c2s:show_tls(match_jid)
+ return self:show(match_jid, tls_info);
+end
+
function def_env.c2s:close(match_jid)
local count = 0;
show_c2s(function (jid, session)
return true, "Total: "..count.." sessions closed";
end
-local function session_flags(session, line)
- if session.cert_identity_status == "valid" then
- line[#line+1] = "(secure)";
- elseif session.secure then
- line[#line+1] = "(encrypted)";
- end
- if session.compressed then
- line[#line+1] = "(compressed)";
- end
- if session.smacks then
- line[#line+1] = "(sm)";
- end
- if session.conn and session.conn:ip():match(":") then
- line[#line+1] = "(IPv6)";
- end
- return table.concat(line, " ");
-end
def_env.s2s = {};
-function def_env.s2s:show(match_jid)
- local _print = self.session.print;
+function def_env.s2s:show(match_jid, annotate)
local print = self.session.print;
-
+ annotate = annotate or session_flags;
+
local count_in, count_out = 0,0;
-
- for host, host_session in pairs(hosts) do
- print = function (...) _print(host); _print(...); print = _print; end
- for remotehost, session in pairs(host_session.s2sout) do
- if (not match_jid) or remotehost:match(match_jid) or host:match(match_jid) then
- count_out = count_out + 1;
- print(session_flags(session, {" ", host, "->", remotehost}));
- if session.sendq then
- print(" There are "..#session.sendq.." queued outgoing stanzas for this connection");
- end
- if session.type == "s2sout_unauthed" then
- if session.connecting then
- print(" Connection not yet established");
- if not session.srv_hosts then
- if not session.conn then
- print(" We do not yet have a DNS answer for this host's SRV records");
- else
- print(" This host has no SRV records, using A record instead");
- end
- elseif session.srv_choice then
- print(" We are on SRV record "..session.srv_choice.." of "..#session.srv_hosts);
- local srv_choice = session.srv_hosts[session.srv_choice];
- print(" Using "..(srv_choice.target or ".")..":"..(srv_choice.port or 5269));
+ local s2s_list = { };
+
+ local s2s_sessions = module:shared"/*/s2s/sessions";
+ for _, session in pairs(s2s_sessions) do
+ local remotehost, localhost, direction;
+ if session.direction == "outgoing" then
+ direction = "->";
+ count_out = count_out + 1;
+ remotehost, localhost = session.to_host or "?", session.from_host or "?";
+ else
+ direction = "<-";
+ count_in = count_in + 1;
+ remotehost, localhost = session.from_host or "?", session.to_host or "?";
+ end
+ local sess_lines = { l = localhost, r = remotehost,
+ annotate(session, { "", direction, remotehost or "?" })};
+
+ if (not match_jid) or remotehost:match(match_jid) or localhost:match(match_jid) then
+ table.insert(s2s_list, sess_lines);
+ local print = function (s) table.insert(sess_lines, " "..s); end
+ if session.sendq then
+ print("There are "..#session.sendq.." queued outgoing stanzas for this connection");
+ end
+ if session.type == "s2sout_unauthed" then
+ if session.connecting then
+ print("Connection not yet established");
+ if not session.srv_hosts then
+ if not session.conn then
+ print("We do not yet have a DNS answer for this host's SRV records");
+ else
+ print("This host has no SRV records, using A record instead");
end
- elseif session.notopen then
- print(" The <stream> has not yet been opened");
- elseif not session.dialback_key then
- print(" Dialback has not been initiated yet");
- elseif session.dialback_key then
- print(" Dialback has been requested, but no result received");
+ elseif session.srv_choice then
+ print("We are on SRV record "..session.srv_choice.." of "..#session.srv_hosts);
+ local srv_choice = session.srv_hosts[session.srv_choice];
+ print("Using "..(srv_choice.target or ".")..":"..(srv_choice.port or 5269));
end
+ elseif session.notopen then
+ print("The <stream> has not yet been opened");
+ elseif not session.dialback_key then
+ print("Dialback has not been initiated yet");
+ elseif session.dialback_key then
+ print("Dialback has been requested, but no result received");
end
end
- end
- local subhost_filter = function (h)
- return (match_jid and h:match(match_jid));
- end
- for session in pairs(incoming_s2s) do
- if session.to_host == host and ((not match_jid) or host:match(match_jid)
- or (session.from_host and session.from_host:match(match_jid))
- -- Pft! is what I say to list comprehensions
- or (session.hosts and #array.collect(keys(session.hosts)):filter(subhost_filter)>0)) then
- count_in = count_in + 1;
- print(session_flags(session, {" ", host, "<-", session.from_host or "(unknown)"}));
- if session.type == "s2sin_unauthed" then
- print(" Connection not yet authenticated");
- end
+ if session.type == "s2sin_unauthed" then
+ print("Connection not yet authenticated");
+ elseif session.type == "s2sin" then
for name in pairs(session.hosts) do
if name ~= session.from_host then
- print(" also hosts "..tostring(name));
+ print("also hosts "..tostring(name));
end
end
end
end
-
- print = _print;
end
-
- for session in pairs(incoming_s2s) do
- if not session.to_host and ((not match_jid) or session.from_host and session.from_host:match(match_jid)) then
- count_in = count_in + 1;
- print("Other incoming s2s connections");
- print(" (unknown) <- "..(session.from_host or "(unknown)"));
- end
+
+ -- Sort by local host, then remote host
+ table.sort(s2s_list, function(a,b)
+ if a.l == b.l then return a.r < b.r; end
+ return a.l < b.l;
+ end);
+ local lasthost;
+ for _, sess_lines in ipairs(s2s_list) do
+ if sess_lines.l ~= lasthost then print(sess_lines.l); lasthost=sess_lines.l end
+ for _, line in ipairs(sess_lines) do print(line); end
end
-
return true, "Total: "..count_out.." outgoing, "..count_in.." incoming connections";
end
+function def_env.s2s:show_tls(match_jid)
+ return self:show(match_jid, tls_info);
+end
+
local function print_subject(print, subject)
for _, entry in ipairs(subject) do
print(
end
function def_env.s2s:showcert(domain)
- local ser = require "util.serialization".serialize;
local print = self.session.print;
- local domain_sessions = set.new(array.collect(keys(incoming_s2s)))
- /function(session) return session.from_host == domain and session or nil; end;
- for local_host in values(prosody.hosts) do
- local s2sout = local_host.s2sout;
- if s2sout and s2sout[domain] then
- domain_sessions:add(s2sout[domain]);
- end
- end
+ local s2s_sessions = module:shared"/*/s2s/sessions";
+ local domain_sessions = set.new(array.collect(values(s2s_sessions)))
+ /function(session) return (session.to_host == domain or session.from_host == domain) and session or nil; end;
local cert_set = {};
for session in domain_sessions do
local conn = session.conn;
local domain_certs = array.collect(values(cert_set));
-- Phew. We now have a array of unique certificates presented by domain.
local n_certs = #domain_certs;
-
+
if n_certs == 0 then
return "No certificates found for "..domain;
end
-
+
local function _capitalize_and_colon(byte)
return string.upper(byte)..":";
end
local function pretty_fingerprint(hash)
return hash:gsub("..", _capitalize_and_colon):sub(1, -2);
end
-
+
for cert_info in values(domain_certs) do
local certs = cert_info.certs;
local cert = certs[1];
function def_env.s2s:close(from, to)
local print, count = self.session.print, 0;
-
- if not (from and to) then
+ local s2s_sessions = module:shared"/*/s2s/sessions";
+
+ local match_id;
+ if from and not to then
+ match_id, from = from;
+ elseif not to then
return false, "Syntax: s2s:close('from', 'to') - Closes all s2s sessions from 'from' to 'to'";
elseif from == to then
return false, "Both from and to are the same... you can't do that :)";
end
-
- if hosts[from] and not hosts[to] then
- -- Is an outgoing connection
- local session = hosts[from].s2sout[to];
- if not session then
- print("No outgoing connection from "..from.." to "..to)
- else
+
+ for _, session in pairs(s2s_sessions) do
+ local id = session.type..tostring(session):match("[a-f0-9]+$");
+ if (match_id and match_id == id)
+ or (session.from_host == from and session.to_host == to) then
+ print(("Closing connection from %s to %s [%s]"):format(session.from_host, session.to_host, id));
(session.close or s2smanager.destroy_session)(session);
- count = count + 1;
- print("Closed outgoing session from "..from.." to "..to);
+ count = count + 1 ;
end
- elseif hosts[to] and not hosts[from] then
- -- Is an incoming connection
- for session in pairs(incoming_s2s) do
- if session.to_host == to and session.from_host == from then
- (session.close or s2smanager.destroy_session)(session);
- count = count + 1;
- end
- end
-
- if count == 0 then
- print("No incoming connections from "..from.." to "..to);
- else
- print("Closed "..count.." incoming session"..((count == 1 and "") or "s").." from "..from.." to "..to);
- end
- elseif hosts[to] and hosts[from] then
- return false, "Both of the hostnames you specified are local, there are no s2s sessions to close";
- else
- return false, "Neither of the hostnames you specified are being used on this server";
end
-
return true, "Closed "..count.." s2s session"..((count == 1 and "") or "s");
end
function def_env.s2s:closeall(host)
- local count = 0;
-
- if not host or type(host) ~= "string" then return false, "wrong syntax: please use s2s:closeall('hostname.tld')"; end
- if hosts[host] then
- for session in pairs(incoming_s2s) do
- if session.to_host == host then
- (session.close or s2smanager.destroy_session)(session);
- count = count + 1;
- end
- end
- for _, session in pairs(hosts[host].s2sout) do
- (session.close or s2smanager.destroy_session)(session);
- count = count + 1;
- end
- else
- for session in pairs(incoming_s2s) do
- if session.from_host == host then
- (session.close or s2smanager.destroy_session)(session);
- count = count + 1;
- end
- end
- for _, h in pairs(hosts) do
- if h.s2sout[host] then
- (h.s2sout[host].close or s2smanager.destroy_session)(h.s2sout[host]);
- count = count + 1;
- end
+ local count = 0;
+ local s2s_sessions = module:shared"/*/s2s/sessions";
+ for _,session in pairs(s2s_sessions) do
+ if not host or session.from_host == host or session.to_host == host then
+ session:close();
+ count = count + 1;
end
- end
-
+ end
if count == 0 then return false, "No sessions to close.";
else return true, "Closed "..count.." s2s session"..((count == 1 and "") or "s"); end
end
function def_env.host:list()
local print = self.session.print;
local i = 0;
+ local type;
for host in values(array.collect(keys(prosody.hosts)):sort()) do
i = i + 1;
- print(host);
+ type = hosts[host].type;
+ if type == "local" then
+ print(host);
+ else
+ type = module:context(host):get_option_string("component_module", type);
+ if type ~= "component" then
+ type = type .. " component";
+ end
+ print(("%s (%s)"):format(host, type));
+ end
end
return true, i.." hosts";
end
end
function def_env.muc:create(room_jid)
- local room, host = check_muc(room_jid);
+ local room_name, host = check_muc(room_jid);
if not room_name then
return room_name, host;
end
- if not room then return nil, host end
+ if not room_name then return nil, host end
if hosts[host].modules.muc.rooms[room_jid] then return nil, "Room exists already" end
return hosts[host].modules.muc.create_room(room_jid);
end
return setmetatable({ room = room_obj }, console_room_mt);
end
+function def_env.muc:list(host)
+ local host_session = hosts[host];
+ if not host_session or not host_session.modules.muc then
+ return nil, "Please supply the address of a local MUC component";
+ end
+ local print = self.session.print;
+ local c = 0;
+ for name in keys(host_session.modules.muc.rooms) do
+ print(name);
+ c = c + 1;
+ end
+ return true, c.." rooms";
+end
+
local um = require"core.usermanager";
def_env.user = {};
return true, "Cache:\n"..tostring(dns.cache())
end
+def_env.http = {};
+
+function def_env.http:list()
+ local print = self.session.print;
+
+ for host in pairs(prosody.hosts) do
+ local http_apps = modulemanager.get_items("http-provider", host);
+ if #http_apps > 0 then
+ local http_host = module:context(host):get_option("http_host");
+ print("HTTP endpoints on "..host..(http_host and (" (using "..http_host.."):") or ":"));
+ for _, provider in ipairs(http_apps) do
+ local url = module:context(host):http_url(provider.name);
+ print("", url);
+ end
+ print("");
+ end
+ end
+
+ local default_host = module:get_option("http_default_host");
+ if not default_host then
+ print("HTTP requests to unknown hosts will return 404 Not Found");
+ else
+ print("HTTP requests to unknown hosts will be handled by "..default_host);
+ end
+ return true;
+end
+
-------------
function printbanner(session)
- local option = module:get_option("console_banner");
- if option == nil or option == "full" or option == "graphic" then
+ local option = module:get_option_string("console_banner", "full");
+ if option == "full" or option == "graphic" then
session.print [[
- ____ \ / _
- | _ \ _ __ ___ ___ _-_ __| |_ _
+ ____ \ / _
+ | _ \ _ __ ___ ___ _-_ __| |_ _
| |_) | '__/ _ \/ __|/ _ \ / _` | | | |
| __/| | | (_) \__ \ |_| | (_| | |_| |
|_| |_| \___/|___/\___/ \__,_|\__, |
- A study in simplicity |___/
+ A study in simplicity |___/
]]
end
- if option == nil or option == "short" or option == "full" then
+ if option == "short" or option == "full" then
session.print("Welcome to the Prosody administration console. For a list of commands, type: help");
session.print("You may find more help on using this console in our online documentation at ");
session.print("http://prosody.im/doc/console\n");
end
- if option and option ~= "short" and option ~= "full" and option ~= "graphic" then
- if type(option) == "string" then
- session.print(option)
- elseif type(option) == "function" then
- module:log("warn", "Using functions as value for the console_banner option is no longer supported");
- end
+ if option ~= "short" and option ~= "full" and option ~= "graphic" then
+ session.print(option);
end
end
projects / prosody.git / blobdiff