mirror of
https://libwebsockets.org/repo/libwebsockets
synced 2025-05-02 07:10:01 +00:00
c9731c5f17
This is a huge patch that should be a global NOP. For unix type platforms it enables -Wconversion to issue warnings (-> error) for all automatic casts that seem less than ideal but are normally concealed by the toolchain. This is things like passing an int to a size_t argument. Once enabled, I went through all args on my default build (which build most things) and tried to make the removed default cast explicit. With that approach it neither change nor bloat the code, since it compiles to whatever it was doing before, just with the casts made explicit... in a few cases I changed some length args from int to size_t but largely left the causes alone. From now on, new code that is relying on less than ideal casting will complain and nudge me to improve it by warnings.
271 lines
9.5 KiB
C
271 lines
9.5 KiB
C
/*
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* ws protocol handler plugin for "lws-minimal"
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*
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* Written in 2010-2019 by Andy Green <andy@warmcat.com>
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*
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* This file is made available under the Creative Commons CC0 1.0
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* Universal Public Domain Dedication.
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*
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* This version holds a single message at a time, which may be lost if a new
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* message comes. See the minimal-ws-server-ring sample for the same thing
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* but using an lws_ring ringbuffer to hold up to 8 messages at a time.
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*/
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#if !defined (LWS_PLUGIN_STATIC)
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#define LWS_DLL
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#define LWS_INTERNAL
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#include <libwebsockets.h>
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#endif
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#include <string.h>
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/*
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* This came from...
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*
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* cat /dev/urandom | hexdump -C -n 1024 | tr -s ' ' | cut -d' ' -f 2-17 | head -n-1 | sed "s/\ /, 0x/g" | sed "s/^/0x/g" | sed "s/\$/,/g"
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*
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* ...then the length tuned by hand to get the ciphertext sizes that we want to
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* confirm are OK.
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*
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* We can only pass in a maximum of one compression buffer of input at a time,
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* which is 1024 by default.
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*/
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unsigned char uncompressible[] = {
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0xfe, 0xcc, 0x47, 0xcb, 0x10, 0xf4, 0x3c, 0x85,
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0x8e, 0xd4, 0xe2, 0xf6, 0xd1, 0xd1, 0xdb, 0x64,
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0x94, 0x50, 0xf6, 0x14, 0x25, 0x03, 0x09, 0x3a,
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0xb1, 0x47, 0x86, 0xa8, 0x3c, 0x4f, 0x3b, 0x98,
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0x7b, 0x3e, 0x67, 0x3e, 0x22, 0xc5, 0x4c, 0x45,
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0xf4, 0xf7, 0xb5, 0x79, 0xc0, 0x26, 0x6e, 0x5c,
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0xf4, 0x10, 0x04, 0xa9, 0x3c, 0x4f, 0xed, 0xc5,
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0x3d, 0xd4, 0x9f, 0x9f, 0xa3, 0xdb, 0x29, 0xeb,
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0x1e, 0xe1, 0x52, 0xab, 0xb5, 0x75, 0x25, 0x86,
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0x86, 0x02, 0x2c, 0x9d, 0x9c, 0x86, 0x46, 0x92,
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0xe9, 0x04, 0xd8, 0x2c, 0x7d, 0x8a, 0x56, 0xe1,
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0xe1, 0xb6, 0x84, 0x4d, 0x17, 0x30, 0x01, 0x60,
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0xa6, 0xf4, 0xba, 0xc9, 0x5a, 0x29, 0xe3, 0x05,
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0xe1, 0xb4, 0x0b, 0x23, 0x74, 0x93, 0x25, 0x76,
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0xce, 0x15, 0xe4, 0x82, 0x9f, 0xbf, 0xe8, 0x6a,
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0x4a, 0xc5, 0xc2, 0x22, 0x91, 0x80, 0xb5, 0xd7,
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0xb3, 0xce, 0x70, 0x0e, 0xf7, 0xbb, 0x2f, 0xc5,
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0x83, 0x39, 0x86, 0xe5, 0x3e, 0xb7, 0x83, 0x87,
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0xc2, 0xeb, 0xc8, 0xed, 0x59, 0x26, 0xc1, 0xe6,
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0x80, 0x17, 0x3c, 0x29, 0x53, 0x4c, 0x1c, 0x3f,
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0x54, 0xbe, 0x34, 0x26, 0x72, 0xed, 0x38, 0x10,
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0xd1, 0x37, 0x07, 0x2d, 0x12, 0x31, 0x9b, 0xc5,
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0x92, 0x09, 0x13, 0x5d, 0x8e, 0xef, 0xdb, 0x52,
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0x7f, 0x7d, 0x6f, 0x62, 0x1e, 0x17, 0xd2, 0xf9,
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0x72, 0x74, 0xc7, 0xd6, 0x1f, 0x8b, 0x9c, 0x4c,
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0x26, 0xd2, 0x6f, 0x7c, 0x33, 0x06, 0xee, 0xc2,
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0xa3, 0x41, 0x43, 0x4f, 0x40, 0x2a, 0x9c, 0xb3,
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0x4a, 0xb1, 0x88, 0x4e, 0x6f, 0xf2, 0xb7, 0x38,
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0xde, 0x87, 0x0d, 0xdc, 0x15, 0x6a, 0x36, 0x6b,
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0xf3, 0x6c, 0x61, 0xf5, 0x24, 0x8e, 0xb6, 0xcc,
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0x8a, 0x3a, 0xa0, 0xb4, 0x9b, 0xae, 0x85, 0x87,
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0x75, 0xf5, 0xbd, 0x50, 0x1f, 0xb5, 0x0c, 0xdb,
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0x6c, 0x68, 0x59, 0xef, 0x37, 0x5a, 0x2a, 0x85,
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0xf0, 0xce, 0x4d, 0x58, 0xa1, 0xa5, 0xde, 0x73,
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0x9b, 0x1a, 0x3d, 0x8a, 0x00, 0xba, 0x2f, 0xe2,
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0xda, 0xad, 0x3c, 0x63, 0x8a, 0x33, 0x39, 0xc4,
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0x07, 0x29, 0x1d, 0xa7, 0x40, 0x3b, 0xa4, 0xa6,
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0xae, 0xee, 0x37, 0x08, 0x83, 0xd1, 0x72, 0x66,
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0x3d, 0x43, 0xe3, 0x7a, 0x48, 0xfc, 0xf8, 0xd4,
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0xe3, 0xab, 0xd0, 0xe9, 0xb1, 0xf4, 0x4d, 0x3c,
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0x6b, 0x58, 0xde, 0x3c, 0x91, 0x0d, 0x3e, 0xec,
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0x35, 0x6d, 0x53, 0xe6, 0xb6, 0x4b, 0xc0, 0x80,
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0x18, 0xab, 0x96, 0x7f, 0x05, 0xd7, 0xd4, 0x81,
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0x0f, 0x92, 0x2b, 0xaf, 0x72, 0x59, 0xc2, 0x14,
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0xca, 0x62, 0x82, 0xac, 0xe3, 0x17, 0x43, 0x61,
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0x4d, 0x1e, 0xfc, 0x72, 0xaf, 0xfc, 0x55, 0x2a,
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0x2b, 0xb6, 0x8e, 0x6e, 0xe6, 0x86, 0xeb, 0xcc,
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0x26, 0x6c, 0xdf, 0xac, 0x02, 0x58, 0xa1, 0x5d,
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0x1b, 0x07, 0xe2, 0x5d, 0x50, 0xb9, 0xbf, 0x2e,
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0x1f, 0x49, 0x39, 0xe6, 0x7f, 0x2f, 0x0e, 0x9d,
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0x09, 0x42, 0xc7, 0xa1, 0xcc, 0xeb, 0x5b, 0x06,
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0x1c, 0x11, 0x9f, 0xea, 0xc1, 0x96, 0x82, 0xa9,
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0x30, 0x6a, 0xda, 0x98, 0x87, 0x43, 0xfd, 0x25,
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0xe7, 0x27, 0x53, 0x9a, 0xb3, 0x2f, 0x19, 0xa9,
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0x1a, 0xf4, 0xd6, 0xf3, 0x9e, 0xba, 0x9a, 0x91,
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0x52, 0x8f, 0x20, 0x6b, 0x4c, 0x3a, 0x2a, 0x3d,
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0xa0, 0xff, 0x8d, 0x61, 0x04, 0xee, 0x26, 0x55,
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0xdd, 0xd7, 0x67, 0xe4, 0x84, 0x0d, 0xf1, 0x5d,
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0xc7, 0xeb, 0xb3, 0x8c, 0x67, 0xa2, 0xc8, 0x1f,
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0x53, 0x02, 0xc4, 0x8c, 0x89, 0xd5, 0x51, 0xc8,
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0x8b, 0xb7, 0xc8, 0x11, 0xbe, 0x0e, 0xc2, 0xb1,
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0x00, 0x35, 0x81, 0x96, 0xac, 0x90, 0x9c, 0xbc,
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0x09, 0x82, 0x75, 0xc3, 0xe7, 0x66, 0x4e, 0x68,
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0xdc, 0xa1, 0xf0, 0xd0, 0x2d, 0x49, 0x3b, 0x47,
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0xba, 0x19, 0xc8, 0x9b, 0x90, 0x12, 0xc0, 0xdf,
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0xda, 0x32, 0x0f, 0x79, 0x6d, 0x1a, 0x5f, 0x92,
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0x51, 0x70, 0xfc, 0xca, 0x08, 0xd4, 0x7f, 0x1a,
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0x56, 0x04, 0x99, 0x33, 0x89, 0x3d, 0x6f, 0x89,
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0x10, 0x25, 0x81, 0xe2, 0xbd, 0x06, 0xd6, 0xaa,
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0x02, 0x8e, 0x4c, 0xa3, 0x60, 0xfd, 0xaf, 0x9c,
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0x81, 0x75, 0xaf, 0x2f, 0xe1, 0x72, 0xe0, 0x6e,
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0x15, 0xdd, 0xbb, 0x92, 0xd1, 0xbe, 0x8e, 0x9b,
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0xfb, 0x82, 0xb9, 0x47, 0x6f, 0x02, 0x28, 0x2a,
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0x67, 0x50, 0xed, 0x24, 0x9b, 0x4d, 0x69, 0xd7,
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0xa9, 0x66, 0x3e, 0x14, 0x4b, 0x00, 0x2a, 0xe4,
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0x3d, 0x63, 0xb2, 0x10, 0xd4, 0x05, 0x9d, 0xe3,
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0xde, 0xce, 0xd8, 0x04, 0x41, 0x03, 0xb5, 0xda,
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0xb0, 0x6f, 0xca, 0x63, 0x64, 0x04, 0xff, 0x07,
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0x58, 0x5f, 0x96, 0xf7, 0x6c, 0xb7, 0x67, 0x05,
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0xd6, 0x85, 0xf2, 0x1e, 0xc1, 0xdc, 0x76, 0x12,
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0x50, 0x83, 0x78, 0xa2, 0x51, 0x94, 0xe1, 0x2e,
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0xb8, 0x97, 0x5b, 0x08, 0x81, 0xac, 0x59, 0x43,
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0xe9, 0x01, 0x09, 0xa2, 0xed, 0x10, 0x4f, 0xb1,
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0x5b, 0xb8, 0x67, 0xe8, 0x61, 0x8d, 0xc8, 0xd9,
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0xc3, 0x5f, 0x65, 0xd7, 0xaa, 0x30, 0x0e, 0xc9,
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0x43, 0x98, 0x1d, 0xf1, 0xa5, 0x28, 0xd5, 0xa1,
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0x6b, 0x8f, 0x89, 0x76, 0x97, 0xa1, 0x3e, 0x6f,
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0x39, 0xf4, 0xb9, 0x6b, 0xa7, 0xfe, 0x58, 0x24,
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0xcd, 0x75, 0xa8, 0xec, 0x9e, 0x1c, 0x8e, 0x02,
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0x2a, 0xce, 0xe9, 0x0a, 0x24, 0x31, 0x89, 0x5a,
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0xd5, 0xdd, 0x70, 0x8e, 0x5f, 0xee, 0xc1, 0x34,
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0xf8, 0xe2, 0x8a, 0xca, 0xf1, 0xf2, 0x71, 0x4c,
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0x31, 0x56, 0xeb, 0x03, 0xf9, 0x6c, 0x0d, 0xa9,
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0x65, 0x6e, 0x88, 0x4f, 0x8e, 0x80, 0x69, 0xd7,
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0xd4, 0x63, 0x45, 0x9c, 0xab, 0x8c, 0x3d, 0x08,
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0x8b, 0xd9, 0x97, 0xdc, 0x88, 0x59, 0x19, 0x2d,
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0xb2, 0x84, 0xf4, 0x78, 0x3e, 0xce, 0x80, 0xba,
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0xeb, 0x34, 0x5a, 0x9e, 0x8e, 0x98, 0xc4, 0x45,
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0x9d, 0x59, 0xb2, 0x7e, 0xc1, 0x7e, 0x5b, 0x89,
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0xd0, 0x02, 0xcb, 0xa4, 0xf1, 0xf2, 0xa7, 0x3a,
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0x05, 0xc3, 0x7d, 0x43, 0x64, 0x7f, 0xf0, 0xc1,
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0xf8, 0x71, 0x3b, 0x38, 0x39, 0xc7, 0x1b, 0xf4,
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0x2f, 0x5a, 0x5c, 0x43, 0x1b, 0xe3, 0x93, 0xe8,
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0x79, 0xe8, 0x35, 0x63, 0x34, 0x7e, 0x25, 0x41,
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0x6f, 0x08, 0xce, 0x6f, 0x95, 0x2a, 0xc2, 0xdc,
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0x65, 0xe2, 0xa5, 0xc0, 0xfd, 0xf1, 0x78, 0x32,
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0x23, 0x09, 0x75, 0x99, 0x12, 0x7a, 0x83, 0xfd,
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0xae, 0x1e, 0xb2, 0xe9, 0x12, 0x5c, 0x3d, 0x03,
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0x68, 0x12, 0x1e, 0xe3, 0x8f, 0xff, 0x47, 0xe3,
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0xb4, 0x7e, 0x9b, 0x7e, 0x60, 0x2e, 0xf4, 0x06,
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0xba, 0x10, 0x08, 0x6b, 0xf9, 0x25, 0x59, 0xf3,
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0x61, 0x13, 0x2b, 0xd1, 0x2f, 0x04, 0x5f, 0xd6,
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0xd3, 0x42, 0xf6, 0x21, 0x57, 0xf6, 0xd3, 0xb3,
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0xec, 0xec, 0x07, 0x33, 0xbf, 0x69, 0x04, 0xec,
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0x88, 0x8d, 0x06, 0x2b, 0xfa, 0xee, 0xb2, 0x7b,
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0x41, 0x2a, 0x49, 0x0f, 0x30, 0x52, 0x41, 0x29,
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0x70, 0xd0, 0xf6, 0xb6, 0xbf, 0x27, 0x1a, 0x56,
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0x9a, 0x4b, 0x2a, 0x67, 0xfb, 0xc8, 0x16, 0x46,
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0x59, 0xc7, 0xf5, 0x5f, 0x20, 0x10, 0x25, 0x6c,
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0x1e, 0x36, 0x20, 0x0c, 0x3e, 0x7e, 0x15, 0x6c,
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0xa2, 0xbd, 0x22, 0xc4, 0x3d, 0xc9, 0x74, 0x56,
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0xab, 0x31, 0x92, 0xb8, 0x9f, 0xa1, 0x05, 0x2e,
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0xc4, 0xdb, 0x32, 0x91, 0xcb, 0x0f, 0x4a, 0x73,
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0x7f, 0xe1, 0xe6, 0x65, 0x2e, 0x5e, 0xa6, 0xaf,
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0xae, 0xa9, 0x04, 0x14, 0x83, 0xef, 0x19, 0x70,
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0x5e, 0xcb, 0xf5, 0x87, 0xcc, 0x45, 0xf7, 0x60,
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0xd7, 0x9d, 0x1e, 0x2e, /* 1012 */
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/* up to here, this generates a 1022-byte single packet of compressed
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* data that is well-formed and produces 1012 bytes of plaintext.
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*
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* The compressed packet ends
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*
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* 03F0: 70 5E CB F5 87 CC 45 F7 60 D7 9D 1E 2E 00
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*/
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0x54, /* 1013 */
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/* up to here, this generates a 1023-byte single packet of compressed
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* data that is well-formed and produces 1013 bytes of plaintext.
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*
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* The compressed packet ends
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*
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* 03F0: 70 5E CB F5 87 CC 45 F7 60 D7 9D 1E 2E 54 00
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*/
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0x83, /* 1014 */
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/* up to here, a 1023-byte + 3-byte (1 byte payload) packet
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* of uncompressed length 1014 */
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0x09, 0x99, 0xf9, 0x71, 0x9f, 0x15, 0x49, 0xda, 0xa8, 0x99, /* 1024 */
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/* up to here, a 1023-byte (1020 payload) + 3-byte (1 payload) packet
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* of uncompressed length 1019 */
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0xf5, 0xe6, 0xa1, 0x71, 0x64, 0x9a, 0x95, 0xed,
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};
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/* generates ciphertext: 1022 1023 1023 + 3 1023 + 3 */
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static int corner_lengths[] = {
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/* bytes plaintext, ciphertext */
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1012, /* 1019 */
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1013, /* 1020 */
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1014, /* 1021 */
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1019, /* 1021 */
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1024, /* 1021*/
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};
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/* one of these is created for each client connecting to us */
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struct per_session_data__minimal {
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int which;
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int last; /* 0 no test, else test number in corner_lengths[] + 1 */
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};
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static int
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callback_minimal(struct lws *wsi, enum lws_callback_reasons reason,
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void *user, void *in, size_t len)
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{
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struct per_session_data__minimal *pss =
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(struct per_session_data__minimal *)user;
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unsigned char buf[LWS_PRE + 2048];
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int m;
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switch (reason) {
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case LWS_CALLBACK_ESTABLISHED:
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if (lws_hdr_copy(wsi, (char *)buf, sizeof(buf),
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WSI_TOKEN_GET_URI) < 0)
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return -1;
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pss->last = atoi((char *)buf + 1);
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if (pss->last > (int)LWS_ARRAY_SIZE(corner_lengths))
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pss->last = 0;
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lws_callback_on_writable(wsi);
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break;
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case LWS_CALLBACK_SERVER_WRITEABLE:
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if (!pss->last)
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break;
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lwsl_err("%s: writable %d, %d\n", __func__, pss->last,
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corner_lengths[pss->last - 1]);
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memcpy(buf + LWS_PRE, uncompressible,
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(unsigned int)corner_lengths[pss->last - 1]);
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/* notice we allowed for LWS_PRE in the payload already */
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m = lws_write(wsi, buf + LWS_PRE, (unsigned int)corner_lengths[pss->last - 1],
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LWS_WRITE_BINARY);
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if (m < corner_lengths[pss->last - 1]) {
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lwsl_err("ERROR %d writing to ws socket\n", m);
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return -1;
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}
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pss->last = 0;
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break;
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default:
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break;
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}
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return 0;
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}
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#define LWS_PLUGIN_PROTOCOL_MINIMAL \
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{ \
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"lws-minimal", \
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callback_minimal, \
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sizeof(struct per_session_data__minimal), \
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2048, \
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0, NULL, 0 \
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}
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