permessage-deflate server implementation #110
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| /* | ||
| copyright: Boaz Segev, 2017-2019 | ||
| license: MIT | ||
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| Feel free to copy, use and enjoy according to the license specified. | ||
| */ | ||
| #ifndef H_WEBSOCKET_DEFLATE_H | ||
| /**\file | ||
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| A single file WebSocket permessage-deflate wrapper | ||
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| */ | ||
| #define H_WEBSOCKET_DEFLATE_H | ||
| #include <fiobj.h> | ||
| #include <stdlib.h> | ||
| #include <zlib.h> | ||
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| #define WS_CHUNK 16384 | ||
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| z_stream *new_z_stream() { | ||
| z_stream *strm = malloc(sizeof(*strm)); | ||
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| *strm = (z_stream){ | ||
| .zalloc = Z_NULL, | ||
| .zfree = Z_NULL, | ||
| .opaque = Z_NULL, | ||
| }; | ||
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| return strm; | ||
| } | ||
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| z_stream *new_deflator() { | ||
| z_stream *strm = new_z_stream(); | ||
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| int ret = deflateInit2(strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED, | ||
| -MAX_WBITS, 4, Z_DEFAULT_STRATEGY); | ||
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| return strm; | ||
| } | ||
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| z_stream *new_inflator() { | ||
| z_stream *strm = new_z_stream(); | ||
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| inflateInit2(strm, -MAX_WBITS); | ||
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| return strm; | ||
| } | ||
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| int deflate_message(fio_str_info_s src, FIOBJ dest, z_stream *strm) { | ||
| int ret, flush; | ||
| unsigned have; | ||
| unsigned char out[WS_CHUNK]; | ||
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| strm->avail_in = src.len; | ||
| strm->next_in = src.data; | ||
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| do { | ||
| strm->avail_out = WS_CHUNK; | ||
| strm->next_out = out; | ||
| ret = deflate(strm, Z_SYNC_FLUSH); | ||
| have = WS_CHUNK - strm->avail_out; | ||
| fiobj_str_write(dest, out, have); | ||
| } while (strm->avail_out == 0); | ||
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| return Z_OK; | ||
| } | ||
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| int inflate_message(fio_str_info_s src, FIOBJ dest, z_stream *strm) { | ||
| int ret; | ||
| unsigned have; | ||
| unsigned char out[WS_CHUNK]; | ||
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| strm->avail_in = src.len; | ||
| strm->next_in = src.data; | ||
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| do { | ||
| strm->avail_out = WS_CHUNK; | ||
| strm->next_out = out; | ||
| ret = inflate(strm, Z_SYNC_FLUSH); | ||
| switch (ret) { | ||
| case Z_NEED_DICT: | ||
| ret = Z_DATA_ERROR; | ||
| case Z_DATA_ERROR: | ||
| case Z_MEM_ERROR: | ||
| (void)inflateEnd(strm); | ||
| return ret; | ||
| } | ||
| have = WS_CHUNK - strm->avail_out; | ||
| fiobj_str_write(dest, out, have); | ||
| } while (strm->avail_out == 0); | ||
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| return ret; | ||
| } | ||
| #endif |
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In addition to testing the
deflatesetting, this should be automated to test for thepermessage-deflatevalue in theSec-WebSocket-Extensionsheader.Web app developers shouldn't have to know anything about the
permessage-deflateWebSocket extension. The choice to enable or disabledeflatesupport should be limited to the settings where the value0is reserved to be replaced with a "smart" default and the "disabled" value should be -1.There was a problem hiding this comment.
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I believe you are mistaking what the deflate variable within websocket_settings_s does (at least currently).
When a connection is upgraded - there needs to be something to store whether or not we want to send out the
sec-websocket-extensions: permessage-deflateheader. That is the job of deflate within websocket_settings_s.It also informs the iodine websocket struct later on via the websocket_attach method within websockets.c
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Yes, there is a place for global settings, it sets the HTTP and WebSocket behavior. For example, it limits WebSocket message sizes to avoid memory drain attacks on the server. This is usually set by the CLI (
iodine_cli_parse) or theIodine.listenmethod which sets the value in theiodine_http_listenfunction.I believe this setting should definitely be settable using the CLI where current behavior should be preserved by setting
-ws-deflate = -1.I also believe this value should be a numerical value representing the minimum length a text message would have to be before it is compressed. Wasting CPU cycles to compress a 16 byte long message (i.e. `""updates":{}") would be regrettable.