mirror of
https://github.com/warmcat/libwebsockets.git
synced 2025-03-09 00:00:04 +01:00
e77fb804dc
This removes all the direct wsi members specific to clients, most of them are moved to being fake headers in the next 3-layer header scheme, c_port moves to being a member of the u.hdr unionized struct. It gets rid of a lot of fiddly mallocs and frees(), despite it adds a small internal API to create the fake headers, actually the patch deletes more than it adds... Signed-off-by: Andy Green <andy.green@linaro.org>
1101 lines
33 KiB
C
1101 lines
33 KiB
C
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010-2013 Andy Green <andy@warmcat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation:
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include "private-libwebsockets.h"
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#ifdef WIN32
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#include <io.h>
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#endif
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unsigned char lextable[] = {
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/* pos 0: state 0 */
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0x47 /* 'G' */, 0x07 /* to pos 14 state 1 */,
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0x48 /* 'H' */, 0x0A /* to pos 22 state 5 */,
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0x43 /* 'C' */, 0x0F /* to pos 34 state 10 */,
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0x53 /* 'S' */, 0x19 /* to pos 56 state 21 */,
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0x55 /* 'U' */, 0x3F /* to pos 134 state 51 */,
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0x4F /* 'O' */, 0x46 /* to pos 150 state 59 */,
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0x8D /* '.' */, 0x52 /* to pos 176 state 72 */,
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/* pos 14: state 1 */
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0xC5 /* 'E' */, 0x01 /* to pos 16 state 2 */,
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/* pos 16: state 2 */
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0xD4 /* 'T' */, 0x01 /* to pos 18 state 3 */,
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/* pos 18: state 3 */
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0xA0 /* ' ' */, 0x01 /* to pos 20 state 4 */,
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/* pos 20: state 4 */
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0x80, 0x00 /* terminal marker */,
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/* pos 22: state 5 */
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0x6F /* 'o' */, 0x02 /* to pos 26 state 6 */,
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0xD4 /* 'T' */, 0x76 /* to pos 260 state 114 */,
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/* pos 26: state 6 */
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0xF3 /* 's' */, 0x01 /* to pos 28 state 7 */,
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/* pos 28: state 7 */
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0xF4 /* 't' */, 0x01 /* to pos 30 state 8 */,
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/* pos 30: state 8 */
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0xBA /* ':' */, 0x01 /* to pos 32 state 9 */,
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/* pos 32: state 9 */
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0x81, 0x00 /* terminal marker */,
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/* pos 34: state 10 */
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0xEF /* 'o' */, 0x01 /* to pos 36 state 11 */,
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/* pos 36: state 11 */
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0xEE /* 'n' */, 0x01 /* to pos 38 state 12 */,
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/* pos 38: state 12 */
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0xEE /* 'n' */, 0x01 /* to pos 40 state 13 */,
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/* pos 40: state 13 */
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0xE5 /* 'e' */, 0x01 /* to pos 42 state 14 */,
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/* pos 42: state 14 */
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0xE3 /* 'c' */, 0x01 /* to pos 44 state 15 */,
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/* pos 44: state 15 */
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0xF4 /* 't' */, 0x01 /* to pos 46 state 16 */,
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/* pos 46: state 16 */
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0xE9 /* 'i' */, 0x01 /* to pos 48 state 17 */,
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/* pos 48: state 17 */
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0xEF /* 'o' */, 0x01 /* to pos 50 state 18 */,
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/* pos 50: state 18 */
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0xEE /* 'n' */, 0x01 /* to pos 52 state 19 */,
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/* pos 52: state 19 */
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0xBA /* ':' */, 0x01 /* to pos 54 state 20 */,
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/* pos 54: state 20 */
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0x82, 0x00 /* terminal marker */,
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/* pos 56: state 21 */
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0xE5 /* 'e' */, 0x01 /* to pos 58 state 22 */,
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/* pos 58: state 22 */
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0xE3 /* 'c' */, 0x01 /* to pos 60 state 23 */,
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/* pos 60: state 23 */
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0xAD /* '-' */, 0x01 /* to pos 62 state 24 */,
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/* pos 62: state 24 */
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0xD7 /* 'W' */, 0x01 /* to pos 64 state 25 */,
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/* pos 64: state 25 */
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0xE5 /* 'e' */, 0x01 /* to pos 66 state 26 */,
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/* pos 66: state 26 */
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0xE2 /* 'b' */, 0x01 /* to pos 68 state 27 */,
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/* pos 68: state 27 */
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0xD3 /* 'S' */, 0x01 /* to pos 70 state 28 */,
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/* pos 70: state 28 */
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0xEF /* 'o' */, 0x01 /* to pos 72 state 29 */,
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/* pos 72: state 29 */
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0xE3 /* 'c' */, 0x01 /* to pos 74 state 30 */,
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/* pos 74: state 30 */
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0xEB /* 'k' */, 0x01 /* to pos 76 state 31 */,
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/* pos 76: state 31 */
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0xE5 /* 'e' */, 0x01 /* to pos 78 state 32 */,
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/* pos 78: state 32 */
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0xF4 /* 't' */, 0x01 /* to pos 80 state 33 */,
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/* pos 80: state 33 */
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0xAD /* '-' */, 0x01 /* to pos 82 state 34 */,
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/* pos 82: state 34 */
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0x4B /* 'K' */, 0x08 /* to pos 98 state 35 */,
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0x50 /* 'P' */, 0x10 /* to pos 116 state 42 */,
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0x44 /* 'D' */, 0x27 /* to pos 164 state 66 */,
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0x56 /* 'V' */, 0x2F /* to pos 182 state 75 */,
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0x4F /* 'O' */, 0x36 /* to pos 198 state 83 */,
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0x45 /* 'E' */, 0x3C /* to pos 212 state 90 */,
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0x41 /* 'A' */, 0x46 /* to pos 234 state 101 */,
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0xCE /* 'N' */, 0x4C /* to pos 248 state 108 */,
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/* pos 98: state 35 */
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0xE5 /* 'e' */, 0x01 /* to pos 100 state 36 */,
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/* pos 100: state 36 */
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0xF9 /* 'y' */, 0x01 /* to pos 102 state 37 */,
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/* pos 102: state 37 */
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0x31 /* '1' */, 0x03 /* to pos 108 state 38 */,
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0x32 /* '2' */, 0x04 /* to pos 112 state 40 */,
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0xBA /* ':' */, 0x25 /* to pos 180 state 74 */,
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/* pos 108: state 38 */
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0xBA /* ':' */, 0x01 /* to pos 110 state 39 */,
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/* pos 110: state 39 */
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0x83, 0x00 /* terminal marker */,
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/* pos 112: state 40 */
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0xBA /* ':' */, 0x01 /* to pos 114 state 41 */,
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/* pos 114: state 41 */
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0x84, 0x00 /* terminal marker */,
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/* pos 116: state 42 */
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0xF2 /* 'r' */, 0x01 /* to pos 118 state 43 */,
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/* pos 118: state 43 */
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0xEF /* 'o' */, 0x01 /* to pos 120 state 44 */,
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/* pos 120: state 44 */
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0xF4 /* 't' */, 0x01 /* to pos 122 state 45 */,
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/* pos 122: state 45 */
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0xEF /* 'o' */, 0x01 /* to pos 124 state 46 */,
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/* pos 124: state 46 */
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0xE3 /* 'c' */, 0x01 /* to pos 126 state 47 */,
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/* pos 126: state 47 */
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0xEF /* 'o' */, 0x01 /* to pos 128 state 48 */,
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/* pos 128: state 48 */
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0xEC /* 'l' */, 0x01 /* to pos 130 state 49 */,
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/* pos 130: state 49 */
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0xBA /* ':' */, 0x01 /* to pos 132 state 50 */,
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/* pos 132: state 50 */
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0x85, 0x00 /* terminal marker */,
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/* pos 134: state 51 */
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0xF0 /* 'p' */, 0x01 /* to pos 136 state 52 */,
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/* pos 136: state 52 */
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0xE7 /* 'g' */, 0x01 /* to pos 138 state 53 */,
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/* pos 138: state 53 */
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0xF2 /* 'r' */, 0x01 /* to pos 140 state 54 */,
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/* pos 140: state 54 */
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0xE1 /* 'a' */, 0x01 /* to pos 142 state 55 */,
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/* pos 142: state 55 */
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0xE4 /* 'd' */, 0x01 /* to pos 144 state 56 */,
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/* pos 144: state 56 */
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0xE5 /* 'e' */, 0x01 /* to pos 146 state 57 */,
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/* pos 146: state 57 */
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0xBA /* ':' */, 0x01 /* to pos 148 state 58 */,
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/* pos 148: state 58 */
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0x86, 0x00 /* terminal marker */,
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/* pos 150: state 59 */
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0xF2 /* 'r' */, 0x01 /* to pos 152 state 60 */,
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/* pos 152: state 60 */
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0xE9 /* 'i' */, 0x01 /* to pos 154 state 61 */,
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/* pos 154: state 61 */
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0xE7 /* 'g' */, 0x01 /* to pos 156 state 62 */,
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/* pos 156: state 62 */
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0xE9 /* 'i' */, 0x01 /* to pos 158 state 63 */,
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/* pos 158: state 63 */
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0xEE /* 'n' */, 0x01 /* to pos 160 state 64 */,
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/* pos 160: state 64 */
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0xBA /* ':' */, 0x01 /* to pos 162 state 65 */,
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/* pos 162: state 65 */
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0x87, 0x00 /* terminal marker */,
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/* pos 164: state 66 */
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0xF2 /* 'r' */, 0x01 /* to pos 166 state 67 */,
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/* pos 166: state 67 */
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0xE1 /* 'a' */, 0x01 /* to pos 168 state 68 */,
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/* pos 168: state 68 */
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0xE6 /* 'f' */, 0x01 /* to pos 170 state 69 */,
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/* pos 170: state 69 */
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0xF4 /* 't' */, 0x01 /* to pos 172 state 70 */,
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/* pos 172: state 70 */
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0xBA /* ':' */, 0x01 /* to pos 174 state 71 */,
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/* pos 174: state 71 */
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0x88, 0x00 /* terminal marker */,
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/* pos 176: state 72 */
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0x8A /* '.' */, 0x01 /* to pos 178 state 73 */,
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/* pos 178: state 73 */
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0x89, 0x00 /* terminal marker */,
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/* pos 180: state 74 */
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0x8A, 0x00 /* terminal marker */,
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/* pos 182: state 75 */
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0xE5 /* 'e' */, 0x01 /* to pos 184 state 76 */,
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/* pos 184: state 76 */
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0xF2 /* 'r' */, 0x01 /* to pos 186 state 77 */,
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/* pos 186: state 77 */
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0xF3 /* 's' */, 0x01 /* to pos 188 state 78 */,
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/* pos 188: state 78 */
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0xE9 /* 'i' */, 0x01 /* to pos 190 state 79 */,
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/* pos 190: state 79 */
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0xEF /* 'o' */, 0x01 /* to pos 192 state 80 */,
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/* pos 192: state 80 */
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0xEE /* 'n' */, 0x01 /* to pos 194 state 81 */,
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/* pos 194: state 81 */
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0xBA /* ':' */, 0x01 /* to pos 196 state 82 */,
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/* pos 196: state 82 */
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0x8B, 0x00 /* terminal marker */,
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/* pos 198: state 83 */
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0xF2 /* 'r' */, 0x01 /* to pos 200 state 84 */,
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/* pos 200: state 84 */
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0xE9 /* 'i' */, 0x01 /* to pos 202 state 85 */,
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/* pos 202: state 85 */
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0xE7 /* 'g' */, 0x01 /* to pos 204 state 86 */,
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/* pos 204: state 86 */
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0xE9 /* 'i' */, 0x01 /* to pos 206 state 87 */,
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/* pos 206: state 87 */
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0xEE /* 'n' */, 0x01 /* to pos 208 state 88 */,
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/* pos 208: state 88 */
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0xBA /* ':' */, 0x01 /* to pos 210 state 89 */,
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/* pos 210: state 89 */
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0x8C, 0x00 /* terminal marker */,
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/* pos 212: state 90 */
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0xF8 /* 'x' */, 0x01 /* to pos 214 state 91 */,
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/* pos 214: state 91 */
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0xF4 /* 't' */, 0x01 /* to pos 216 state 92 */,
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/* pos 216: state 92 */
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0xE5 /* 'e' */, 0x01 /* to pos 218 state 93 */,
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/* pos 218: state 93 */
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0xEE /* 'n' */, 0x01 /* to pos 220 state 94 */,
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/* pos 220: state 94 */
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0xF3 /* 's' */, 0x01 /* to pos 222 state 95 */,
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/* pos 222: state 95 */
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0xE9 /* 'i' */, 0x01 /* to pos 224 state 96 */,
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/* pos 224: state 96 */
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0xEF /* 'o' */, 0x01 /* to pos 226 state 97 */,
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/* pos 226: state 97 */
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0xEE /* 'n' */, 0x01 /* to pos 228 state 98 */,
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/* pos 228: state 98 */
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0xF3 /* 's' */, 0x01 /* to pos 230 state 99 */,
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/* pos 230: state 99 */
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0xBA /* ':' */, 0x01 /* to pos 232 state 100 */,
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/* pos 232: state 100 */
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0x8D, 0x00 /* terminal marker */,
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/* pos 234: state 101 */
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0xE3 /* 'c' */, 0x01 /* to pos 236 state 102 */,
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/* pos 236: state 102 */
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0xE3 /* 'c' */, 0x01 /* to pos 238 state 103 */,
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/* pos 238: state 103 */
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0xE5 /* 'e' */, 0x01 /* to pos 240 state 104 */,
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/* pos 240: state 104 */
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0xF0 /* 'p' */, 0x01 /* to pos 242 state 105 */,
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/* pos 242: state 105 */
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0xF4 /* 't' */, 0x01 /* to pos 244 state 106 */,
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/* pos 244: state 106 */
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0xBA /* ':' */, 0x01 /* to pos 246 state 107 */,
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/* pos 246: state 107 */
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0x8E, 0x00 /* terminal marker */,
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/* pos 248: state 108 */
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0xEF /* 'o' */, 0x01 /* to pos 250 state 109 */,
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/* pos 250: state 109 */
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0xEE /* 'n' */, 0x01 /* to pos 252 state 110 */,
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/* pos 252: state 110 */
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0xE3 /* 'c' */, 0x01 /* to pos 254 state 111 */,
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/* pos 254: state 111 */
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0xE5 /* 'e' */, 0x01 /* to pos 256 state 112 */,
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/* pos 256: state 112 */
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0xBA /* ':' */, 0x01 /* to pos 258 state 113 */,
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/* pos 258: state 113 */
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0x8F, 0x00 /* terminal marker */,
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/* pos 260: state 114 */
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0xD4 /* 'T' */, 0x01 /* to pos 262 state 115 */,
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/* pos 262: state 115 */
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0xD0 /* 'P' */, 0x01 /* to pos 264 state 116 */,
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/* pos 264: state 116 */
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0xAF /* '/' */, 0x01 /* to pos 266 state 117 */,
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/* pos 266: state 117 */
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0xB1 /* '1' */, 0x01 /* to pos 268 state 118 */,
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/* pos 268: state 118 */
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0xAE /* '.' */, 0x01 /* to pos 270 state 119 */,
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/* pos 270: state 119 */
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0xB1 /* '1' */, 0x01 /* to pos 272 state 120 */,
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/* pos 272: state 120 */
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0xA0 /* ' ' */, 0x01 /* to pos 274 state 121 */,
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/* pos 274: state 121 */
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0x90, 0x00 /* terminal marker */,
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/* total size 276 bytes */
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};
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int lextable_decode(int pos, char c)
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{
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while (pos >= 0) {
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if (lextable[pos + 1] == 0) // terminal marker
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return pos;
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if ((lextable[pos] & 0x7f) == c)
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return pos + (lextable[pos + 1] << 1);
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if (lextable[pos] & 0x80)
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return -1;
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pos += 2;
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}
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return pos;
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}
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int lws_allocate_header_table(struct libwebsocket *wsi)
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{
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wsi->u.hdr.ah = malloc(sizeof *wsi->u.hdr.ah);
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if (wsi->u.hdr.ah == NULL) {
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lwsl_err("Out of memory\n");
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return -1;
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}
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memset(wsi->u.hdr.ah->frag_index, 0, sizeof wsi->u.hdr.ah->frag_index);
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wsi->u.hdr.ah->next_frag_index = 0;
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wsi->u.hdr.ah->pos = 0;
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return 0;
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}
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int lws_hdr_total_length(struct libwebsocket *wsi, enum lws_token_indexes h)
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{
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int n;
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int len = 0;
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n = wsi->u.hdr.ah->frag_index[h];
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if (n == 0)
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return 0;
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do {
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len += wsi->u.hdr.ah->frags[n].len;
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n = wsi->u.hdr.ah->frags[n].next_frag_index;
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} while (n);
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return len;
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}
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int lws_hdr_copy(struct libwebsocket *wsi, char *dest, int len, enum lws_token_indexes h)
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{
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int toklen = lws_hdr_total_length(wsi, h);
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int n;
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if (toklen >= len)
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return -1;
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n = wsi->u.hdr.ah->frag_index[h];
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if (n == 0)
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return 0;
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do {
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strcpy(dest, &wsi->u.hdr.ah->data[wsi->u.hdr.ah->frags[n].offset]);
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dest += wsi->u.hdr.ah->frags[n].len;
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n = wsi->u.hdr.ah->frags[n].next_frag_index;
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} while (n);
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return toklen;
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}
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char * lws_hdr_simple_ptr(struct libwebsocket *wsi, enum lws_token_indexes h)
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{
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int n;
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n = wsi->u.hdr.ah->frag_index[h];
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if (!n)
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return NULL;
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return &wsi->u.hdr.ah->data[wsi->u.hdr.ah->frags[n].offset];
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}
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int lws_hdr_simple_create(struct libwebsocket *wsi, enum lws_token_indexes h, const char *s)
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{
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wsi->u.hdr.ah->next_frag_index++;
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if (wsi->u.hdr.ah->next_frag_index == sizeof(wsi->u.hdr.ah->frags) / sizeof(wsi->u.hdr.ah->frags[0])) {
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lwsl_warn("More header fragments than we can deal with, dropping\n");
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return -1;
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}
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wsi->u.hdr.ah->frag_index[h] = wsi->u.hdr.ah->next_frag_index;
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wsi->u.hdr.ah->frags[wsi->u.hdr.ah->next_frag_index].offset = wsi->u.hdr.ah->pos;
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wsi->u.hdr.ah->frags[wsi->u.hdr.ah->next_frag_index].len = 0;
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wsi->u.hdr.ah->frags[wsi->u.hdr.ah->next_frag_index].next_frag_index = 0;
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do {
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if (wsi->u.hdr.ah->pos == sizeof wsi->u.hdr.ah->data) {
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lwsl_err("Ran out of header data space\n");
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return -1;
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}
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wsi->u.hdr.ah->data[wsi->u.hdr.ah->pos++] = *s;
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if (*s)
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wsi->u.hdr.ah->frags[wsi->u.hdr.ah->next_frag_index].len++;
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} while (*s++);
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return 0;
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}
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int libwebsocket_parse(struct libwebsocket *wsi, unsigned char c)
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{
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int n;
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switch (wsi->u.hdr.parser_state) {
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case WSI_TOKEN_GET_URI:
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case WSI_TOKEN_HOST:
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case WSI_TOKEN_CONNECTION:
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case WSI_TOKEN_KEY1:
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case WSI_TOKEN_KEY2:
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case WSI_TOKEN_PROTOCOL:
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case WSI_TOKEN_UPGRADE:
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case WSI_TOKEN_ORIGIN:
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case WSI_TOKEN_SWORIGIN:
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case WSI_TOKEN_DRAFT:
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case WSI_TOKEN_CHALLENGE:
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case WSI_TOKEN_KEY:
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case WSI_TOKEN_VERSION:
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case WSI_TOKEN_ACCEPT:
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case WSI_TOKEN_NONCE:
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case WSI_TOKEN_EXTENSIONS:
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case WSI_TOKEN_HTTP:
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lwsl_parser("WSI_TOKEN_(%d) '%c'\n", wsi->u.hdr.parser_state, c);
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/* collect into malloc'd buffers */
|
|
/* optional initial space swallow */
|
|
if (!wsi->u.hdr.ah->frags[wsi->u.hdr.ah->frag_index[wsi->u.hdr.parser_state]].len && c == ' ')
|
|
break;
|
|
|
|
/* special case space terminator for get-uri */
|
|
if (wsi->u.hdr.parser_state == WSI_TOKEN_GET_URI && c == ' ') {
|
|
c = '\0';
|
|
wsi->u.hdr.parser_state = WSI_TOKEN_SKIPPING;
|
|
}
|
|
|
|
/* bail at EOL */
|
|
if (wsi->u.hdr.parser_state != WSI_TOKEN_CHALLENGE && c == '\x0d') {
|
|
c = '\0';
|
|
wsi->u.hdr.parser_state = WSI_TOKEN_SKIPPING_SAW_CR;
|
|
lwsl_parser("*\n");
|
|
}
|
|
|
|
if (wsi->u.hdr.ah->pos == sizeof wsi->u.hdr.ah->data) {
|
|
lwsl_warn("excessive header content\n");
|
|
return -1;
|
|
}
|
|
wsi->u.hdr.ah->data[wsi->u.hdr.ah->pos++] = c;
|
|
if (c)
|
|
wsi->u.hdr.ah->frags[wsi->u.hdr.ah->next_frag_index].len++;
|
|
|
|
/* per-protocol end of headers management */
|
|
|
|
if (wsi->u.hdr.parser_state == WSI_TOKEN_CHALLENGE)
|
|
goto set_parsing_complete;
|
|
break;
|
|
|
|
/* collecting and checking a name part */
|
|
case WSI_TOKEN_NAME_PART:
|
|
lwsl_parser("WSI_TOKEN_NAME_PART '%c'\n", c);
|
|
|
|
if (wsi->u.hdr.name_buffer_pos == sizeof(wsi->u.hdr.name_buffer) - 1) {
|
|
/* name bigger than we can handle, skip until next */
|
|
wsi->u.hdr.parser_state = WSI_TOKEN_SKIPPING;
|
|
break;
|
|
}
|
|
wsi->u.hdr.name_buffer[wsi->u.hdr.name_buffer_pos++] = c;
|
|
wsi->u.hdr.name_buffer[wsi->u.hdr.name_buffer_pos] = '\0';
|
|
|
|
wsi->u.hdr.lextable_pos = lextable_decode(wsi->u.hdr.lextable_pos, c);
|
|
|
|
if (wsi->u.hdr.lextable_pos < 0) {
|
|
/* this is not a header we know about */
|
|
if (wsi->u.hdr.ah->frag_index[WSI_TOKEN_GET_URI]) {
|
|
/* altready had the method, no idea what this crap is, ignore */
|
|
wsi->u.hdr.parser_state = WSI_TOKEN_SKIPPING;
|
|
break;
|
|
}
|
|
/* hm it's an unknown http method in fact */
|
|
if (c == ' ') {
|
|
lwsl_info("Unknown method %s\n", wsi->u.hdr.name_buffer);
|
|
/* treat it as GET */
|
|
wsi->u.hdr.parser_state = WSI_TOKEN_GET_URI;
|
|
goto start_fragment;
|
|
}
|
|
}
|
|
if (lextable[wsi->u.hdr.lextable_pos + 1] == 0) {
|
|
|
|
/* terminal state */
|
|
|
|
n = lextable[wsi->u.hdr.lextable_pos] & 0x7f;
|
|
|
|
lwsl_parser("known hdr '%s'\n", wsi->u.hdr.name_buffer);
|
|
|
|
/*
|
|
* WSORIGIN is protocol equiv to ORIGIN,
|
|
* JWebSocket likes to send it, map to ORIGIN
|
|
*/
|
|
if (n == WSI_TOKEN_SWORIGIN)
|
|
n = WSI_TOKEN_ORIGIN;
|
|
|
|
wsi->u.hdr.parser_state = (enum lws_token_indexes)
|
|
(WSI_TOKEN_GET_URI + n);
|
|
if (wsi->u.hdr.parser_state == WSI_TOKEN_CHALLENGE)
|
|
goto set_parsing_complete;
|
|
|
|
goto start_fragment;
|
|
}
|
|
break;
|
|
|
|
start_fragment:
|
|
wsi->u.hdr.ah->next_frag_index++;
|
|
if (wsi->u.hdr.ah->next_frag_index == sizeof(wsi->u.hdr.ah->frags) / sizeof(wsi->u.hdr.ah->frags[0])) {
|
|
lwsl_warn("More header fragments than we can deal with, dropping\n");
|
|
return -1;
|
|
}
|
|
|
|
wsi->u.hdr.ah->frags[wsi->u.hdr.ah->next_frag_index].offset = wsi->u.hdr.ah->pos;
|
|
wsi->u.hdr.ah->frags[wsi->u.hdr.ah->next_frag_index].len = 0;
|
|
wsi->u.hdr.ah->frags[wsi->u.hdr.ah->next_frag_index].next_frag_index = 0;
|
|
|
|
n = wsi->u.hdr.ah->frag_index[wsi->u.hdr.parser_state];
|
|
if (!n) { /* first fragment */
|
|
wsi->u.hdr.ah->frag_index[wsi->u.hdr.parser_state] =
|
|
wsi->u.hdr.ah->next_frag_index;
|
|
} else { /* continuation */
|
|
while (wsi->u.hdr.ah->frags[n].next_frag_index)
|
|
n = wsi->u.hdr.ah->frags[n].next_frag_index;
|
|
wsi->u.hdr.ah->frags[n].next_frag_index =
|
|
wsi->u.hdr.ah->next_frag_index;
|
|
|
|
if (wsi->u.hdr.ah->pos == sizeof wsi->u.hdr.ah->data) {
|
|
lwsl_warn("excessive header content\n");
|
|
return -1;
|
|
}
|
|
|
|
wsi->u.hdr.ah->data[wsi->u.hdr.ah->pos++] = ' ';
|
|
wsi->u.hdr.ah->frags[wsi->u.hdr.ah->next_frag_index].len++;
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
/* skipping arg part of a name we didn't recognize */
|
|
case WSI_TOKEN_SKIPPING:
|
|
lwsl_parser("WSI_TOKEN_SKIPPING '%c'\n", c);
|
|
if (c == '\x0d')
|
|
wsi->u.hdr.parser_state = WSI_TOKEN_SKIPPING_SAW_CR;
|
|
break;
|
|
|
|
case WSI_TOKEN_SKIPPING_SAW_CR:
|
|
lwsl_parser("WSI_TOKEN_SKIPPING_SAW_CR '%c'\n", c);
|
|
if (c == '\x0a') {
|
|
wsi->u.hdr.parser_state = WSI_TOKEN_NAME_PART;
|
|
wsi->u.hdr.lextable_pos = 0;
|
|
} else
|
|
wsi->u.hdr.parser_state = WSI_TOKEN_SKIPPING;
|
|
wsi->u.hdr.name_buffer_pos = 0;
|
|
break;
|
|
/* we're done, ignore anything else */
|
|
case WSI_PARSING_COMPLETE:
|
|
lwsl_parser("WSI_PARSING_COMPLETE '%c'\n", c);
|
|
break;
|
|
|
|
default: /* keep gcc happy */
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
|
|
set_parsing_complete:
|
|
|
|
if (lws_hdr_total_length(wsi, WSI_TOKEN_UPGRADE)) {
|
|
if (!lws_hdr_total_length(wsi, WSI_TOKEN_VERSION)) {
|
|
// lwsl_info("Missing Version Header\n");
|
|
// return 1;
|
|
} else
|
|
wsi->ietf_spec_revision =
|
|
atoi(lws_hdr_simple_ptr(wsi, WSI_TOKEN_VERSION));
|
|
|
|
lwsl_parser("v%02d headers completed\n", wsi->ietf_spec_revision);
|
|
}
|
|
wsi->u.hdr.parser_state = WSI_PARSING_COMPLETE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* lws_frame_is_binary: true if the current frame was sent in binary mode
|
|
*
|
|
* @wsi: the connection we are inquiring about
|
|
*
|
|
* This is intended to be called from the LWS_CALLBACK_RECEIVE callback if
|
|
* it's interested to see if the frame it's dealing with was sent in binary
|
|
* mode.
|
|
*/
|
|
|
|
int lws_frame_is_binary(struct libwebsocket *wsi)
|
|
{
|
|
return wsi->u.ws.frame_is_binary;
|
|
}
|
|
|
|
int
|
|
libwebsocket_rx_sm(struct libwebsocket *wsi, unsigned char c)
|
|
{
|
|
int n;
|
|
struct lws_tokens eff_buf;
|
|
int ret = 0;
|
|
#ifndef LWS_NO_EXTENSIONS
|
|
int handled;
|
|
int m;
|
|
#endif
|
|
|
|
#if 0
|
|
lwsl_debug("RX: %02X ", c);
|
|
#endif
|
|
|
|
switch (wsi->lws_rx_parse_state) {
|
|
case LWS_RXPS_NEW:
|
|
|
|
switch (wsi->ietf_spec_revision) {
|
|
case 13:
|
|
/*
|
|
* no prepended frame key any more
|
|
*/
|
|
wsi->u.ws.all_zero_nonce = 1;
|
|
goto handle_first;
|
|
|
|
default:
|
|
lwsl_warn("libwebsocket_rx_sm doesn't know "
|
|
"about spec version %d\n", wsi->ietf_spec_revision);
|
|
break;
|
|
}
|
|
break;
|
|
case LWS_RXPS_04_MASK_NONCE_1:
|
|
wsi->u.ws.frame_masking_nonce_04[1] = c;
|
|
if (c)
|
|
wsi->u.ws.all_zero_nonce = 0;
|
|
wsi->lws_rx_parse_state = LWS_RXPS_04_MASK_NONCE_2;
|
|
break;
|
|
case LWS_RXPS_04_MASK_NONCE_2:
|
|
wsi->u.ws.frame_masking_nonce_04[2] = c;
|
|
if (c)
|
|
wsi->u.ws.all_zero_nonce = 0;
|
|
wsi->lws_rx_parse_state = LWS_RXPS_04_MASK_NONCE_3;
|
|
break;
|
|
case LWS_RXPS_04_MASK_NONCE_3:
|
|
wsi->u.ws.frame_masking_nonce_04[3] = c;
|
|
if (c)
|
|
wsi->u.ws.all_zero_nonce = 0;
|
|
|
|
/*
|
|
* start from the zero'th byte in the XOR key buffer since
|
|
* this is the start of a frame with a new key
|
|
*/
|
|
|
|
wsi->u.ws.frame_mask_index = 0;
|
|
|
|
wsi->lws_rx_parse_state = LWS_RXPS_04_FRAME_HDR_1;
|
|
break;
|
|
|
|
/*
|
|
* 04 logical framing from the spec (all this is masked when incoming
|
|
* and has to be unmasked)
|
|
*
|
|
* We ignore the possibility of extension data because we don't
|
|
* negotiate any extensions at the moment.
|
|
*
|
|
* 0 1 2 3
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
|
* +-+-+-+-+-------+-+-------------+-------------------------------+
|
|
* |F|R|R|R| opcode|R| Payload len | Extended payload length |
|
|
* |I|S|S|S| (4) |S| (7) | (16/63) |
|
|
* |N|V|V|V| |V| | (if payload len==126/127) |
|
|
* | |1|2|3| |4| | |
|
|
* +-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - +
|
|
* | Extended payload length continued, if payload len == 127 |
|
|
* + - - - - - - - - - - - - - - - +-------------------------------+
|
|
* | | Extension data |
|
|
* +-------------------------------+ - - - - - - - - - - - - - - - +
|
|
* : :
|
|
* +---------------------------------------------------------------+
|
|
* : Application data :
|
|
* +---------------------------------------------------------------+
|
|
*
|
|
* We pass payload through to userland as soon as we get it, ignoring
|
|
* FIN. It's up to userland to buffer it up if it wants to see a
|
|
* whole unfragmented block of the original size (which may be up to
|
|
* 2^63 long!)
|
|
*/
|
|
|
|
case LWS_RXPS_04_FRAME_HDR_1:
|
|
handle_first:
|
|
|
|
/*
|
|
* 04 spec defines the opcode like this: (1, 2, and 3 are
|
|
* "control frame" opcodes which may not be fragmented or
|
|
* have size larger than 126)
|
|
*
|
|
* frame-opcode =
|
|
* %x0 ; continuation frame
|
|
* / %x1 ; connection close
|
|
* / %x2 ; ping
|
|
* / %x3 ; pong
|
|
* / %x4 ; text frame
|
|
* / %x5 ; binary frame
|
|
* / %x6-F ; reserved
|
|
*
|
|
* FIN (b7)
|
|
*/
|
|
|
|
wsi->u.ws.opcode = c & 0xf;
|
|
wsi->u.ws.rsv = c & 0x70;
|
|
wsi->u.ws.final = !!((c >> 7) & 1);
|
|
switch (wsi->u.ws.opcode) {
|
|
case LWS_WS_OPCODE_07__TEXT_FRAME:
|
|
case LWS_WS_OPCODE_07__BINARY_FRAME:
|
|
wsi->u.ws.frame_is_binary = wsi->u.ws.opcode == LWS_WS_OPCODE_07__BINARY_FRAME;
|
|
break;
|
|
}
|
|
wsi->lws_rx_parse_state = LWS_RXPS_04_FRAME_HDR_LEN;
|
|
break;
|
|
|
|
case LWS_RXPS_04_FRAME_HDR_LEN:
|
|
|
|
wsi->u.ws.this_frame_masked = !!(c & 0x80);
|
|
|
|
switch (c & 0x7f) {
|
|
case 126:
|
|
/* control frames are not allowed to have big lengths */
|
|
if (wsi->u.ws.opcode & 8)
|
|
goto illegal_ctl_length;
|
|
|
|
wsi->lws_rx_parse_state = LWS_RXPS_04_FRAME_HDR_LEN16_2;
|
|
break;
|
|
case 127:
|
|
/* control frames are not allowed to have big lengths */
|
|
if (wsi->u.ws.opcode & 8)
|
|
goto illegal_ctl_length;
|
|
|
|
wsi->lws_rx_parse_state = LWS_RXPS_04_FRAME_HDR_LEN64_8;
|
|
break;
|
|
default:
|
|
wsi->u.ws.rx_packet_length = c & 0x7f;
|
|
if (wsi->u.ws.this_frame_masked)
|
|
wsi->lws_rx_parse_state =
|
|
LWS_RXPS_07_COLLECT_FRAME_KEY_1;
|
|
else
|
|
wsi->lws_rx_parse_state =
|
|
LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case LWS_RXPS_04_FRAME_HDR_LEN16_2:
|
|
wsi->u.ws.rx_packet_length = c << 8;
|
|
wsi->lws_rx_parse_state = LWS_RXPS_04_FRAME_HDR_LEN16_1;
|
|
break;
|
|
|
|
case LWS_RXPS_04_FRAME_HDR_LEN16_1:
|
|
wsi->u.ws.rx_packet_length |= c;
|
|
if (wsi->u.ws.this_frame_masked)
|
|
wsi->lws_rx_parse_state =
|
|
LWS_RXPS_07_COLLECT_FRAME_KEY_1;
|
|
else
|
|
wsi->lws_rx_parse_state =
|
|
LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED;
|
|
break;
|
|
|
|
case LWS_RXPS_04_FRAME_HDR_LEN64_8:
|
|
if (c & 0x80) {
|
|
lwsl_warn("b63 of length must be zero\n");
|
|
/* kill the connection */
|
|
return -1;
|
|
}
|
|
#if defined __LP64__
|
|
wsi->u.ws.rx_packet_length = ((size_t)c) << 56;
|
|
#else
|
|
wsi->u.ws.rx_packet_length = 0;
|
|
#endif
|
|
wsi->lws_rx_parse_state = LWS_RXPS_04_FRAME_HDR_LEN64_7;
|
|
break;
|
|
|
|
case LWS_RXPS_04_FRAME_HDR_LEN64_7:
|
|
#if defined __LP64__
|
|
wsi->u.ws.rx_packet_length |= ((size_t)c) << 48;
|
|
#endif
|
|
wsi->lws_rx_parse_state = LWS_RXPS_04_FRAME_HDR_LEN64_6;
|
|
break;
|
|
|
|
case LWS_RXPS_04_FRAME_HDR_LEN64_6:
|
|
#if defined __LP64__
|
|
wsi->u.ws.rx_packet_length |= ((size_t)c) << 40;
|
|
#endif
|
|
wsi->lws_rx_parse_state = LWS_RXPS_04_FRAME_HDR_LEN64_5;
|
|
break;
|
|
|
|
case LWS_RXPS_04_FRAME_HDR_LEN64_5:
|
|
#if defined __LP64__
|
|
wsi->u.ws.rx_packet_length |= ((size_t)c) << 32;
|
|
#endif
|
|
wsi->lws_rx_parse_state = LWS_RXPS_04_FRAME_HDR_LEN64_4;
|
|
break;
|
|
|
|
case LWS_RXPS_04_FRAME_HDR_LEN64_4:
|
|
wsi->u.ws.rx_packet_length |= ((size_t)c) << 24;
|
|
wsi->lws_rx_parse_state = LWS_RXPS_04_FRAME_HDR_LEN64_3;
|
|
break;
|
|
|
|
case LWS_RXPS_04_FRAME_HDR_LEN64_3:
|
|
wsi->u.ws.rx_packet_length |= ((size_t)c) << 16;
|
|
wsi->lws_rx_parse_state = LWS_RXPS_04_FRAME_HDR_LEN64_2;
|
|
break;
|
|
|
|
case LWS_RXPS_04_FRAME_HDR_LEN64_2:
|
|
wsi->u.ws.rx_packet_length |= ((size_t)c) << 8;
|
|
wsi->lws_rx_parse_state = LWS_RXPS_04_FRAME_HDR_LEN64_1;
|
|
break;
|
|
|
|
case LWS_RXPS_04_FRAME_HDR_LEN64_1:
|
|
wsi->u.ws.rx_packet_length |= ((size_t)c);
|
|
if (wsi->u.ws.this_frame_masked)
|
|
wsi->lws_rx_parse_state =
|
|
LWS_RXPS_07_COLLECT_FRAME_KEY_1;
|
|
else
|
|
wsi->lws_rx_parse_state =
|
|
LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED;
|
|
break;
|
|
|
|
case LWS_RXPS_07_COLLECT_FRAME_KEY_1:
|
|
wsi->u.ws.frame_masking_nonce_04[0] = c;
|
|
if (c)
|
|
wsi->u.ws.all_zero_nonce = 0;
|
|
wsi->lws_rx_parse_state = LWS_RXPS_07_COLLECT_FRAME_KEY_2;
|
|
break;
|
|
|
|
case LWS_RXPS_07_COLLECT_FRAME_KEY_2:
|
|
wsi->u.ws.frame_masking_nonce_04[1] = c;
|
|
if (c)
|
|
wsi->u.ws.all_zero_nonce = 0;
|
|
wsi->lws_rx_parse_state = LWS_RXPS_07_COLLECT_FRAME_KEY_3;
|
|
break;
|
|
|
|
case LWS_RXPS_07_COLLECT_FRAME_KEY_3:
|
|
wsi->u.ws.frame_masking_nonce_04[2] = c;
|
|
if (c)
|
|
wsi->u.ws.all_zero_nonce = 0;
|
|
wsi->lws_rx_parse_state = LWS_RXPS_07_COLLECT_FRAME_KEY_4;
|
|
break;
|
|
|
|
case LWS_RXPS_07_COLLECT_FRAME_KEY_4:
|
|
wsi->u.ws.frame_masking_nonce_04[3] = c;
|
|
if (c)
|
|
wsi->u.ws.all_zero_nonce = 0;
|
|
wsi->lws_rx_parse_state =
|
|
LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED;
|
|
wsi->u.ws.frame_mask_index = 0;
|
|
break;
|
|
|
|
|
|
case LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED:
|
|
|
|
if (!wsi->u.ws.rx_user_buffer)
|
|
lwsl_err("NULL user buffer...\n");
|
|
|
|
if (wsi->u.ws.all_zero_nonce)
|
|
wsi->u.ws.rx_user_buffer[LWS_SEND_BUFFER_PRE_PADDING +
|
|
(wsi->u.ws.rx_user_buffer_head++)] = c;
|
|
else
|
|
wsi->u.ws.rx_user_buffer[LWS_SEND_BUFFER_PRE_PADDING +
|
|
(wsi->u.ws.rx_user_buffer_head++)] =
|
|
c ^ wsi->u.ws.frame_masking_nonce_04[(wsi->u.ws.frame_mask_index++) & 3];
|
|
|
|
if (--wsi->u.ws.rx_packet_length == 0) {
|
|
wsi->lws_rx_parse_state = LWS_RXPS_NEW;
|
|
goto spill;
|
|
}
|
|
if (wsi->u.ws.rx_user_buffer_head != wsi->protocol->rx_buffer_size)
|
|
break;
|
|
spill:
|
|
/*
|
|
* is this frame a control packet we should take care of at this
|
|
* layer? If so service it and hide it from the user callback
|
|
*/
|
|
|
|
lwsl_parser("spill on %s\n", wsi->protocol->name);
|
|
|
|
switch (wsi->u.ws.opcode) {
|
|
case LWS_WS_OPCODE_07__CLOSE:
|
|
/* is this an acknowledgement of our close? */
|
|
if (wsi->state == WSI_STATE_AWAITING_CLOSE_ACK) {
|
|
/*
|
|
* fine he has told us he is closing too, let's
|
|
* finish our close
|
|
*/
|
|
lwsl_parser("seen client close ack\n");
|
|
return -1;
|
|
}
|
|
lwsl_parser("server sees client close packet\n");
|
|
/* parrot the close packet payload back */
|
|
n = libwebsocket_write(wsi, (unsigned char *)
|
|
&wsi->u.ws.rx_user_buffer[LWS_SEND_BUFFER_PRE_PADDING],
|
|
wsi->u.ws.rx_user_buffer_head, LWS_WRITE_CLOSE);
|
|
if (n)
|
|
lwsl_info("write of close ack failed %d\n", n);
|
|
wsi->state = WSI_STATE_RETURNED_CLOSE_ALREADY;
|
|
/* close the connection */
|
|
return -1;
|
|
|
|
case LWS_WS_OPCODE_07__PING:
|
|
lwsl_info("received %d byte ping, sending pong\n", wsi->u.ws.rx_user_buffer_head);
|
|
lwsl_hexdump(&wsi->u.ws.rx_user_buffer[LWS_SEND_BUFFER_PRE_PADDING], wsi->u.ws.rx_user_buffer_head);
|
|
/* parrot the ping packet payload back as a pong */
|
|
n = libwebsocket_write(wsi, (unsigned char *)
|
|
&wsi->u.ws.rx_user_buffer[LWS_SEND_BUFFER_PRE_PADDING], wsi->u.ws.rx_user_buffer_head, LWS_WRITE_PONG);
|
|
/* ... then just drop it */
|
|
wsi->u.ws.rx_user_buffer_head = 0;
|
|
return 0;
|
|
|
|
case LWS_WS_OPCODE_07__PONG:
|
|
/* ... then just drop it */
|
|
wsi->u.ws.rx_user_buffer_head = 0;
|
|
return 0;
|
|
|
|
case LWS_WS_OPCODE_07__TEXT_FRAME:
|
|
case LWS_WS_OPCODE_07__BINARY_FRAME:
|
|
case LWS_WS_OPCODE_07__CONTINUATION:
|
|
break;
|
|
|
|
default:
|
|
#ifndef LWS_NO_EXTENSIONS
|
|
lwsl_parser("passing opcode %x up to exts\n", wsi->u.ws.opcode);
|
|
|
|
/*
|
|
* It's something special we can't understand here.
|
|
* Pass the payload up to the extension's parsing
|
|
* state machine.
|
|
*/
|
|
|
|
eff_buf.token = &wsi->u.ws.rx_user_buffer[
|
|
LWS_SEND_BUFFER_PRE_PADDING];
|
|
eff_buf.token_len = wsi->u.ws.rx_user_buffer_head;
|
|
|
|
handled = 0;
|
|
for (n = 0; n < wsi->count_active_extensions; n++) {
|
|
m = wsi->active_extensions[n]->callback(
|
|
wsi->protocol->owning_server,
|
|
wsi->active_extensions[n], wsi,
|
|
LWS_EXT_CALLBACK_EXTENDED_PAYLOAD_RX,
|
|
wsi->active_extensions_user[n],
|
|
&eff_buf, 0);
|
|
if (m)
|
|
handled = 1;
|
|
}
|
|
|
|
if (!handled)
|
|
#endif
|
|
lwsl_ext("Unhandled extended opcode "
|
|
"0x%x - ignoring frame\n", wsi->u.ws.opcode);
|
|
|
|
wsi->u.ws.rx_user_buffer_head = 0;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* No it's real payload, pass it up to the user callback.
|
|
* It's nicely buffered with the pre-padding taken care of
|
|
* so it can be sent straight out again using libwebsocket_write
|
|
*/
|
|
|
|
eff_buf.token = &wsi->u.ws.rx_user_buffer[
|
|
LWS_SEND_BUFFER_PRE_PADDING];
|
|
eff_buf.token_len = wsi->u.ws.rx_user_buffer_head;
|
|
#ifndef LWS_NO_EXTENSIONS
|
|
for (n = 0; n < wsi->count_active_extensions; n++) {
|
|
m = wsi->active_extensions[n]->callback(
|
|
wsi->protocol->owning_server,
|
|
wsi->active_extensions[n], wsi,
|
|
LWS_EXT_CALLBACK_PAYLOAD_RX,
|
|
wsi->active_extensions_user[n],
|
|
&eff_buf, 0);
|
|
if (m < 0) {
|
|
lwsl_ext(
|
|
"Extension '%s' failed to handle payload!\n",
|
|
wsi->active_extensions[n]->name);
|
|
return -1;
|
|
}
|
|
}
|
|
#endif
|
|
if (eff_buf.token_len > 0) {
|
|
eff_buf.token[eff_buf.token_len] = '\0';
|
|
|
|
if (wsi->protocol->callback)
|
|
ret = user_callback_handle_rxflow(wsi->protocol->callback,
|
|
wsi->protocol->owning_server,
|
|
wsi, LWS_CALLBACK_RECEIVE,
|
|
wsi->user_space,
|
|
eff_buf.token,
|
|
eff_buf.token_len);
|
|
else
|
|
lwsl_err("No callback on payload spill!\n");
|
|
}
|
|
|
|
wsi->u.ws.rx_user_buffer_head = 0;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
|
|
illegal_ctl_length:
|
|
|
|
lwsl_warn("Control frame asking for "
|
|
"extended length is illegal\n");
|
|
/* kill the connection */
|
|
return -1;
|
|
}
|
|
|
|
|
|
int libwebsocket_interpret_incoming_packet(struct libwebsocket *wsi,
|
|
unsigned char *buf, size_t len)
|
|
{
|
|
size_t n;
|
|
int m;
|
|
int clear_rxflow = !!wsi->u.ws.rxflow_buffer;
|
|
struct libwebsocket_context *context = wsi->protocol->owning_server;
|
|
|
|
#if 0
|
|
lwsl_parser("received %d byte packet\n", (int)len);
|
|
lwsl_hexdump(buf, len);
|
|
#endif
|
|
|
|
if (buf && wsi->u.ws.rxflow_buffer)
|
|
lwsl_err("!!!! libwebsocket_interpret_incoming_packet: was pending rxflow, data loss\n");
|
|
|
|
/* let the rx protocol state machine have as much as it needs */
|
|
|
|
n = 0;
|
|
if (!buf) {
|
|
lwsl_info("dumping stored rxflow buffer len %d pos=%d\n", wsi->u.ws.rxflow_len, wsi->u.ws.rxflow_pos);
|
|
buf = wsi->u.ws.rxflow_buffer;
|
|
n = wsi->u.ws.rxflow_pos;
|
|
len = wsi->u.ws.rxflow_len;
|
|
/* let's pretend he's already allowing input */
|
|
context->fds[wsi->position_in_fds_table].events |= POLLIN;
|
|
}
|
|
|
|
while (n < len) {
|
|
if (!(context->fds[wsi->position_in_fds_table].events & POLLIN)) {
|
|
/* his RX is flowcontrolled */
|
|
if (!wsi->u.ws.rxflow_buffer) { /* a new rxflow in effect, buffer it and warn caller */
|
|
lwsl_info("new rxflow input buffer len %d\n", len - n);
|
|
wsi->u.ws.rxflow_buffer = (unsigned char *)malloc(len - n);
|
|
wsi->u.ws.rxflow_len = len - n;
|
|
wsi->u.ws.rxflow_pos = 0;
|
|
memcpy(wsi->u.ws.rxflow_buffer, buf + n, len - n);
|
|
} else {
|
|
lwsl_info("re-using rxflow input buffer\n");
|
|
/* rxflow while we were spilling previous rxflow buffer */
|
|
wsi->u.ws.rxflow_pos = n;
|
|
}
|
|
return 1;
|
|
}
|
|
m = libwebsocket_rx_sm(wsi, buf[n]);
|
|
if (m < 0)
|
|
return -1;
|
|
n++;
|
|
}
|
|
|
|
if (clear_rxflow) {
|
|
lwsl_info("flow: clearing it\n");
|
|
free(wsi->u.ws.rxflow_buffer);
|
|
wsi->u.ws.rxflow_buffer = NULL;
|
|
context->fds[wsi->position_in_fds_table].events &= ~POLLIN;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* libwebsockets_remaining_packet_payload() - Bytes to come before "overall"
|
|
* rx packet is complete
|
|
* @wsi: Websocket instance (available from user callback)
|
|
*
|
|
* This function is intended to be called from the callback if the
|
|
* user code is interested in "complete packets" from the client.
|
|
* libwebsockets just passes through payload as it comes and issues a buffer
|
|
* additionally when it hits a built-in limit. The LWS_CALLBACK_RECEIVE
|
|
* callback handler can use this API to find out if the buffer it has just
|
|
* been given is the last piece of a "complete packet" from the client --
|
|
* when that is the case libwebsockets_remaining_packet_payload() will return
|
|
* 0.
|
|
*
|
|
* Many protocols won't care becuse their packets are always small.
|
|
*/
|
|
|
|
size_t
|
|
libwebsockets_remaining_packet_payload(struct libwebsocket *wsi)
|
|
{
|
|
return wsi->u.ws.rx_packet_length;
|
|
}
|