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-rw-r--r--plugins/mod_compression.lua206
1 files changed, 148 insertions, 58 deletions
diff --git a/plugins/mod_compression.lua b/plugins/mod_compression.lua
index f1cae737..8fdf9dcc 100644
--- a/plugins/mod_compression.lua
+++ b/plugins/mod_compression.lua
@@ -8,16 +8,16 @@
local st = require "util.stanza";
local zlib = require "zlib";
local pcall = pcall;
-
local xmlns_compression_feature = "http://jabber.org/features/compress"
local xmlns_compression_protocol = "http://jabber.org/protocol/compress"
+local xmlns_stream = "http://etherx.jabber.org/streams";
local compression_stream_feature = st.stanza("compression", {xmlns=xmlns_compression_feature}):tag("method"):text("zlib"):up();
local compression_level = module:get_option("compression_level");
-
-- if not defined assume admin wants best compression
if compression_level == nil then compression_level = 9 end;
+
compression_level = tonumber(compression_level);
if not compression_level or compression_level < 1 or compression_level > 9 then
module:log("warn", "Invalid compression level in config: %s", tostring(compression_level));
@@ -34,89 +34,179 @@ module:add_event_hook("stream-features",
end
);
--- TODO Support compression on S2S level too.
-module:add_handler({"c2s_unauthed", "c2s"}, "compress", xmlns_compression_protocol,
+module:hook("s2s-stream-features",
+ function (data)
+ local session, features = data.session, data.features;
+ -- FIXME only advertise compression support when TLS layer has no compression enabled
+ if not session.compressed then
+ features:add_child(compression_stream_feature);
+ end
+ end
+);
+
+-- Hook to activate compression if remote server supports it.
+module:hook_stanza(xmlns_stream, "features",
+ function (session, stanza)
+ if not session.compressed then
+ -- does remote server support compression?
+ local comp_st = stanza:child_with_name("compression");
+ if comp_st then
+ -- do we support the mechanism
+ for a in comp_st:children() do
+ local algorithm = a[1]
+ if algorithm == "zlib" then
+ session.sends2s(st.stanza("compress", {xmlns=xmlns_compression_protocol}):tag("method"):text("zlib"))
+ session.log("info", "Enabled compression using zlib.")
+ return true;
+ end
+ end
+ session.log("debug", "Remote server supports no compression algorithm we support.")
+ end
+ end
+ end
+, 250);
+
+
+-- returns either nil or a fully functional ready to use inflate stream
+local function get_deflate_stream(session)
+ local status, deflate_stream = pcall(zlib.deflate, compression_level);
+ if status == false then
+ local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
+ (session.sends2s or session.send)(error_st);
+ session.log("error", "Failed to create zlib.deflate filter.");
+ module:log("error", deflate_stream);
+ return
+ end
+ return deflate_stream
+end
+
+-- returns either nil or a fully functional ready to use inflate stream
+local function get_inflate_stream(session)
+ local status, inflate_stream = pcall(zlib.inflate);
+ if status == false then
+ local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
+ (session.sends2s or session.send)(error_st);
+ session.log("error", "Failed to create zlib.deflate filter.");
+ module:log("error", inflate_stream);
+ return
+ end
+ return inflate_stream
+end
+
+-- setup compression for a stream
+local function setup_compression(session, deflate_stream)
+ local old_send = (session.sends2s or session.send);
+
+ local new_send = function(t)
+ --TODO: Better code injection in the sending process
+ session.log(t)
+ local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync');
+ if status == false then
+ session:close({
+ condition = "undefined-condition";
+ text = compressed;
+ extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
+ });
+ module:log("warn", compressed);
+ return;
+ end
+ session.conn:write(compressed);
+ end;
+
+ if session.sends2s then session.sends2s = new_send
+ elseif session.send then session.send = new_send end
+end
+
+-- setup decompression for a stream
+local function setup_decompression(session, inflate_stream)
+ local old_data = session.data
+ session.data = function(conn, data)
+ local status, decompressed, eof = pcall(inflate_stream, data);
+ if status == false then
+ session:close({
+ condition = "undefined-condition";
+ text = decompressed;
+ extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
+ });
+ module:log("warn", decompressed);
+ return;
+ end
+ old_data(conn, decompressed);
+ end;
+end
+
+module:add_handler({"s2sout_unauthed", "s2sout"}, "compressed", xmlns_compression_protocol,
+ function(session ,stanza)
+ session.log("debug", "Activating compression...")
+ -- create deflate and inflate streams
+ local deflate_stream = get_deflate_stream(session);
+ if not deflate_stream then return end
+
+ local inflate_stream = get_inflate_stream(session);
+ if not inflate_stream then return end
+
+ -- setup compression for session.w
+ setup_compression(session, deflate_stream);
+
+ -- setup decompression for session.data
+ setup_decompression(session, inflate_stream);
+ local session_reset_stream = session.reset_stream;
+ session.reset_stream = function(session)
+ session_reset_stream(session);
+ setup_decompression(session, inflate_stream);
+ return true;
+ end;
+ session:reset_stream();
+ local default_stream_attr = {xmlns = "jabber:server", ["xmlns:stream"] = "http://etherx.jabber.org/streams",
+ ["xmlns:db"] = 'jabber:server:dialback', version = "1.0", to = session.to_host, from = session.from_host};
+ session.sends2s("<?xml version='1.0'?>");
+ session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
+ session.compressed = true;
+ end
+);
+
+module:add_handler({"c2s_unauthed", "c2s", "s2sin_unauthed", "s2sin"}, "compress", xmlns_compression_protocol,
function(session, stanza)
-- fail if we are already compressed
if session.compressed then
local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method");
- session.send(error_st);
- session:log("warn", "Tried to establish another compression layer.");
+ (session.sends2s or session.send)(error_st);
+ session.log("warn", "Tried to establish another compression layer.");
end
-- checking if the compression method is supported
local method = stanza:child_with_name("method")[1];
if method == "zlib" then
session.log("info", method.." compression selected.");
- session.send(st.stanza("compressed", {xmlns=xmlns_compression_protocol}));
- session:reset_stream();
-- create deflate and inflate streams
- local status, deflate_stream = pcall(zlib.deflate, compression_level);
- if status == false then
- local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
- session.send(error_st);
- session:log("error", "Failed to create zlib.deflate filter.");
- module:log("error", deflate_stream);
- return
- end
+ local deflate_stream = get_deflate_stream(session);
+ if not deflate_stream then return end
- local status, inflate_stream = pcall(zlib.inflate);
- if status == false then
- local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
- session.send(error_st);
- session:log("error", "Failed to create zlib.deflate filter.");
- module:log("error", inflate_stream);
- return
- end
+ local inflate_stream = get_inflate_stream(session);
+ if not inflate_stream then return end
- -- setup compression for session.w
- local old_send = session.send;
+ (session.sends2s or session.send)(st.stanza("compressed", {xmlns=xmlns_compression_protocol}));
+ session:reset_stream();
- session.send = function(t)
- local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync');
- if status == false then
- session:close({
- condition = "undefined-condition";
- text = compressed;
- extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
- });
- module:log("warn", compressed);
- return;
- end
- old_send(compressed);
- end;
+ -- setup compression for session.w
+ setup_compression(session, deflate_stream);
-- setup decompression for session.data
- local function setup_decompression(session)
- local old_data = session.data
- session.data = function(conn, data)
- local status, decompressed, eof = pcall(inflate_stream, data);
- if status == false then
- session:close({
- condition = "undefined-condition";
- text = decompressed;
- extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
- });
- module:log("warn", decompressed);
- return;
- end
- old_data(conn, decompressed);
- end;
- end
- setup_decompression(session);
+ setup_decompression(session, inflate_stream);
local session_reset_stream = session.reset_stream;
session.reset_stream = function(session)
session_reset_stream(session);
- setup_decompression(session);
+ setup_decompression(session, inflate_stream);
return true;
end;
session.compressed = true;
else
session.log("info", method.." compression selected. But we don't support it.");
local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method");
- session.send(error_st);
+ (session.sends2s or session.send)(error_st);
end
end
);
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-07 19:39:14 +0000