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SqMod/vendor/CivetWeb/mod_http2.inl

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Initial implementation of WebSocket client.
2021-09-07 19:55:05 +02:00
/* Prototype implementation for HTTP2. Do not use in production.
* There may be memory leaks, security vulnerabilities, ...
*/
/***********************************************************************/
/*** HPACK ***/
/***********************************************************************/
/* hpack predefined table. See:
* https://tools.ietf.org/html/rfc7541#appendix-A
*/
static struct mg_header hpack_predefined[62] = {{NULL, NULL},
{":authority", NULL},
{":method", "GET"},
{":method", "POST"},
{":path", "/"},
{":path", "/index.html"},
{":scheme", "http"},
{":scheme", "https"},
{":status", "200"},
{":status", "204"},
{":status", "206"},
{":status", "304"},
{":status", "400"},
{":status", "404"},
{":status", "500"},
{"accept-charset", NULL},
{"accept-encoding", NULL},
{"accept-language", NULL},
{"accept-ranges", NULL},
{"accept", NULL},
{"access-control-allow-origin",
NULL},
{"age", NULL},
{"allow", NULL},
{"authorization", NULL},
{"cache-control", NULL},
{"content-encoding", NULL},
{"content-disposition", NULL},
{"content-language", NULL},
{"content-length", NULL},
{"content-location", NULL},
{"content-range", NULL},
{"content-type", NULL},
{"cookie", NULL},
{"date", NULL},
{"etag", NULL},
{"expect", NULL},
{"expires", NULL},
{"from", NULL},
{"host", NULL},
{"if-match", NULL},
{"if-modified-since", NULL},
{"if-none-match", NULL},
{"if-range", NULL},
{"if-unmodified-since", NULL},
{"last-modified", NULL},
{"link", NULL},
{"location", NULL},
{"max-forwards", NULL},
{"proxy-authenticate", NULL},
{"proxy-authorization", NULL},
{"range", NULL},
{"referer", NULL},
{"refresh", NULL},
{"retry-after", NULL},
{"server", NULL},
{"set-cookie", NULL},
{"strict-transport-security",
NULL},
{"transfer-encoding", NULL},
{"user-agent", NULL},
{"vary", NULL},
{"via", NULL},
{"www-authenticate", NULL}};
/* Huffman decoding: https://tools.ietf.org/html/rfc7541#appendix-B
'0' ( 48) |00000 0 [ 5]
'1' ( 49) |00001 1 [ 5]
'2' ( 50) |00010 2 [ 5]
'a' ( 97) |00011 3 [ 5]
'c' ( 99) |00100 4 [ 5]
'e' (101) |00101 5 [ 5]
'i' (105) |00110 6 [ 5]
'o' (111) |00111 7 [ 5]
's' (115) |01000 8 [ 5]
't' (116) |01001 9 [ 5]
' ' ( 32) |010100 14 [ 6]
'%' ( 37) |010101 15 [ 6]
'-' ( 45) |010110 16 [ 6]
'.' ( 46) |010111 17 [ 6]
'/' ( 47) |011000 18 [ 6]
'3' ( 51) |011001 19 [ 6]
'4' ( 52) |011010 1a [ 6]
'5' ( 53) |011011 1b [ 6]
'6' ( 54) |011100 1c [ 6]
'7' ( 55) |011101 1d [ 6]
'8' ( 56) |011110 1e [ 6]
'9' ( 57) |011111 1f [ 6]
'=' ( 61) |100000 20 [ 6]
'A' ( 65) |100001 21 [ 6]
'_' ( 95) |100010 22 [ 6]
'b' ( 98) |100011 23 [ 6]
'd' (100) |100100 24 [ 6]
'f' (102) |100101 25 [ 6]
'g' (103) |100110 26 [ 6]
'h' (104) |100111 27 [ 6]
'l' (108) |101000 28 [ 6]
'm' (109) |101001 29 [ 6]
'n' (110) |101010 2a [ 6]
'p' (112) |101011 2b [ 6]
'r' (114) |101100 2c [ 6]
'u' (117) |101101 2d [ 6]
':' ( 58) |1011100 5c [ 7]
'B' ( 66) |1011101 5d [ 7]
'C' ( 67) |1011110 5e [ 7]
'D' ( 68) |1011111 5f [ 7]
'E' ( 69) |1100000 60 [ 7]
'F' ( 70) |1100001 61 [ 7]
'G' ( 71) |1100010 62 [ 7]
'H' ( 72) |1100011 63 [ 7]
'I' ( 73) |1100100 64 [ 7]
'J' ( 74) |1100101 65 [ 7]
'K' ( 75) |1100110 66 [ 7]
'L' ( 76) |1100111 67 [ 7]
'M' ( 77) |1101000 68 [ 7]
'N' ( 78) |1101001 69 [ 7]
'O' ( 79) |1101010 6a [ 7]
'P' ( 80) |1101011 6b [ 7]
'Q' ( 81) |1101100 6c [ 7]
'R' ( 82) |1101101 6d [ 7]
'S' ( 83) |1101110 6e [ 7]
'T' ( 84) |1101111 6f [ 7]
'U' ( 85) |1110000 70 [ 7]
'V' ( 86) |1110001 71 [ 7]
'W' ( 87) |1110010 72 [ 7]
'Y' ( 89) |1110011 73 [ 7]
'j' (106) |1110100 74 [ 7]
'k' (107) |1110101 75 [ 7]
'q' (113) |1110110 76 [ 7]
'v' (118) |1110111 77 [ 7]
'w' (119) |1111000 78 [ 7]
'x' (120) |1111001 79 [ 7]
'y' (121) |1111010 7a [ 7]
'z' (122) |1111011 7b [ 7]
'&' ( 38) |11111000 f8 [ 8]
'*' ( 42) |11111001 f9 [ 8]
',' ( 44) |11111010 fa [ 8]
';' ( 59) |11111011 fb [ 8]
'X' ( 88) |11111100 fc [ 8]
'Z' ( 90) |11111101 fd [ 8]
'!' ( 33) |11111110|00 3f8 [10]
'"' ( 34) |11111110|01 3f9 [10]
'(' ( 40) |11111110|10 3fa [10]
')' ( 41) |11111110|11 3fb [10]
'?' ( 63) |11111111|00 3fc [10]
''' ( 39) |11111111|010 7fa [11]
'+' ( 43) |11111111|011 7fb [11]
'|' (124) |11111111|100 7fc [11]
'#' ( 35) |11111111|1010 ffa [12]
'>' ( 62) |11111111|1011 ffb [12]
( 0) |11111111|11000 1ff8 [13]
'$' ( 36) |11111111|11001 1ff9 [13]
'@' ( 64) |11111111|11010 1ffa [13]
'[' ( 91) |11111111|11011 1ffb [13]
']' ( 93) |11111111|11100 1ffc [13]
'~' (126) |11111111|11101 1ffd [13]
'^' ( 94) |11111111|111100 3ffc [14]
'}' (125) |11111111|111101 3ffd [14]
'<' ( 60) |11111111|1111100 7ffc [15]
'`' ( 96) |11111111|1111101 7ffd [15]
'{' (123) |11111111|1111110 7ffe [15]
'\' ( 92) |11111111|11111110|000 7fff0 [19]
(195) |11111111|11111110|001 7fff1 [19]
(208) |11111111|11111110|010 7fff2 [19]
(128) |11111111|11111110|0110 fffe6 [20]
(130) |11111111|11111110|0111 fffe7 [20]
(131) |11111111|11111110|1000 fffe8 [20]
(162) |11111111|11111110|1001 fffe9 [20]
(184) |11111111|11111110|1010 fffea [20]
(194) |11111111|11111110|1011 fffeb [20]
(224) |11111111|11111110|1100 fffec [20]
(226) |11111111|11111110|1101 fffed [20]
(153) |11111111|11111110|11100 1fffdc [21]
(161) |11111111|11111110|11101 1fffdd [21]
(167) |11111111|11111110|11110 1fffde [21]
(172) |11111111|11111110|11111 1fffdf [21]
(176) |11111111|11111111|00000 1fffe0 [21]
(177) |11111111|11111111|00001 1fffe1 [21]
(179) |11111111|11111111|00010 1fffe2 [21]
(209) |11111111|11111111|00011 1fffe3 [21]
(216) |11111111|11111111|00100 1fffe4 [21]
(217) |11111111|11111111|00101 1fffe5 [21]
(227) |11111111|11111111|00110 1fffe6 [21]
(229) |11111111|11111111|00111 1fffe7 [21]
(230) |11111111|11111111|01000 1fffe8 [21]
(129) |11111111|11111111|010010 3fffd2 [22]
(132) |11111111|11111111|010011 3fffd3 [22]
(133) |11111111|11111111|010100 3fffd4 [22]
(134) |11111111|11111111|010101 3fffd5 [22]
(136) |11111111|11111111|010110 3fffd6 [22]
(146) |11111111|11111111|010111 3fffd7 [22]
(154) |11111111|11111111|011000 3fffd8 [22]
(156) |11111111|11111111|011001 3fffd9 [22]
(160) |11111111|11111111|011010 3fffda [22]
(163) |11111111|11111111|011011 3fffdb [22]
(164) |11111111|11111111|011100 3fffdc [22]
(169) |11111111|11111111|011101 3fffdd [22]
(170) |11111111|11111111|011110 3fffde [22]
(173) |11111111|11111111|011111 3fffdf [22]
(178) |11111111|11111111|100000 3fffe0 [22]
(181) |11111111|11111111|100001 3fffe1 [22]
(185) |11111111|11111111|100010 3fffe2 [22]
(186) |11111111|11111111|100011 3fffe3 [22]
(187) |11111111|11111111|100100 3fffe4 [22]
(189) |11111111|11111111|100101 3fffe5 [22]
(190) |11111111|11111111|100110 3fffe6 [22]
(196) |11111111|11111111|100111 3fffe7 [22]
(198) |11111111|11111111|101000 3fffe8 [22]
(228) |11111111|11111111|101001 3fffe9 [22]
(232) |11111111|11111111|101010 3fffea [22]
(233) |11111111|11111111|101011 3fffeb [22]
( 1) |11111111|11111111|1011000 7fffd8 [23]
(135) |11111111|11111111|1011001 7fffd9 [23]
(137) |11111111|11111111|1011010 7fffda [23]
(138) |11111111|11111111|1011011 7fffdb [23]
(139) |11111111|11111111|1011100 7fffdc [23]
(140) |11111111|11111111|1011101 7fffdd [23]
(141) |11111111|11111111|1011110 7fffde [23]
(143) |11111111|11111111|1011111 7fffdf [23]
(147) |11111111|11111111|1100000 7fffe0 [23]
(149) |11111111|11111111|1100001 7fffe1 [23]
(150) |11111111|11111111|1100010 7fffe2 [23]
(151) |11111111|11111111|1100011 7fffe3 [23]
(152) |11111111|11111111|1100100 7fffe4 [23]
(155) |11111111|11111111|1100101 7fffe5 [23]
(157) |11111111|11111111|1100110 7fffe6 [23]
(158) |11111111|11111111|1100111 7fffe7 [23]
(165) |11111111|11111111|1101000 7fffe8 [23]
(166) |11111111|11111111|1101001 7fffe9 [23]
(168) |11111111|11111111|1101010 7fffea [23]
(174) |11111111|11111111|1101011 7fffeb [23]
(175) |11111111|11111111|1101100 7fffec [23]
(180) |11111111|11111111|1101101 7fffed [23]
(182) |11111111|11111111|1101110 7fffee [23]
(183) |11111111|11111111|1101111 7fffef [23]
(188) |11111111|11111111|1110000 7ffff0 [23]
(191) |11111111|11111111|1110001 7ffff1 [23]
(197) |11111111|11111111|1110010 7ffff2 [23]
(231) |11111111|11111111|1110011 7ffff3 [23]
(239) |11111111|11111111|1110100 7ffff4 [23]
( 9) |11111111|11111111|11101010 ffffea [24]
(142) |11111111|11111111|11101011 ffffeb [24]
(144) |11111111|11111111|11101100 ffffec [24]
(145) |11111111|11111111|11101101 ffffed [24]
(148) |11111111|11111111|11101110 ffffee [24]
(159) |11111111|11111111|11101111 ffffef [24]
(171) |11111111|11111111|11110000 fffff0 [24]
(206) |11111111|11111111|11110001 fffff1 [24]
(215) |11111111|11111111|11110010 fffff2 [24]
(225) |11111111|11111111|11110011 fffff3 [24]
(236) |11111111|11111111|11110100 fffff4 [24]
(237) |11111111|11111111|11110101 fffff5 [24]
(199) |11111111|11111111|11110110|0 1ffffec [25]
(207) |11111111|11111111|11110110|1 1ffffed [25]
(234) |11111111|11111111|11110111|0 1ffffee [25]
(235) |11111111|11111111|11110111|1 1ffffef [25]
(192) |11111111|11111111|11111000|00 3ffffe0 [26]
(193) |11111111|11111111|11111000|01 3ffffe1 [26]
(200) |11111111|11111111|11111000|10 3ffffe2 [26]
(201) |11111111|11111111|11111000|11 3ffffe3 [26]
(202) |11111111|11111111|11111001|00 3ffffe4 [26]
(205) |11111111|11111111|11111001|01 3ffffe5 [26]
(210) |11111111|11111111|11111001|10 3ffffe6 [26]
(213) |11111111|11111111|11111001|11 3ffffe7 [26]
(218) |11111111|11111111|11111010|00 3ffffe8 [26]
(219) |11111111|11111111|11111010|01 3ffffe9 [26]
(238) |11111111|11111111|11111010|10 3ffffea [26]
(240) |11111111|11111111|11111010|11 3ffffeb [26]
(242) |11111111|11111111|11111011|00 3ffffec [26]
(243) |11111111|11111111|11111011|01 3ffffed [26]
(255) |11111111|11111111|11111011|10 3ffffee [26]
(203) |11111111|11111111|11111011|110 7ffffde [27]
(204) |11111111|11111111|11111011|111 7ffffdf [27]
(211) |11111111|11111111|11111100|000 7ffffe0 [27]
(212) |11111111|11111111|11111100|001 7ffffe1 [27]
(214) |11111111|11111111|11111100|010 7ffffe2 [27]
(221) |11111111|11111111|11111100|011 7ffffe3 [27]
(222) |11111111|11111111|11111100|100 7ffffe4 [27]
(223) |11111111|11111111|11111100|101 7ffffe5 [27]
(241) |11111111|11111111|11111100|110 7ffffe6 [27]
(244) |11111111|11111111|11111100|111 7ffffe7 [27]
(245) |11111111|11111111|11111101|000 7ffffe8 [27]
(246) |11111111|11111111|11111101|001 7ffffe9 [27]
(247) |11111111|11111111|11111101|010 7ffffea [27]
(248) |11111111|11111111|11111101|011 7ffffeb [27]
(250) |11111111|11111111|11111101|100 7ffffec [27]
(251) |11111111|11111111|11111101|101 7ffffed [27]
(252) |11111111|11111111|11111101|110 7ffffee [27]
(253) |11111111|11111111|11111101|111 7ffffef [27]
(254) |11111111|11111111|11111110|000 7fffff0 [27]
( 2) |11111111|11111111|11111110|0010 fffffe2 [28]
( 3) |11111111|11111111|11111110|0011 fffffe3 [28]
( 4) |11111111|11111111|11111110|0100 fffffe4 [28]
( 5) |11111111|11111111|11111110|0101 fffffe5 [28]
( 6) |11111111|11111111|11111110|0110 fffffe6 [28]
( 7) |11111111|11111111|11111110|0111 fffffe7 [28]
( 8) |11111111|11111111|11111110|1000 fffffe8 [28]
( 11) |11111111|11111111|11111110|1001 fffffe9 [28]
( 12) |11111111|11111111|11111110|1010 fffffea [28]
( 14) |11111111|11111111|11111110|1011 fffffeb [28]
( 15) |11111111|11111111|11111110|1100 fffffec [28]
( 16) |11111111|11111111|11111110|1101 fffffed [28]
( 17) |11111111|11111111|11111110|1110 fffffee [28]
( 18) |11111111|11111111|11111110|1111 fffffef [28]
( 19) |11111111|11111111|11111111|0000 ffffff0 [28]
( 20) |11111111|11111111|11111111|0001 ffffff1 [28]
( 21) |11111111|11111111|11111111|0010 ffffff2 [28]
( 23) |11111111|11111111|11111111|0011 ffffff3 [28]
( 24) |11111111|11111111|11111111|0100 ffffff4 [28]
( 25) |11111111|11111111|11111111|0101 ffffff5 [28]
( 26) |11111111|11111111|11111111|0110 ffffff6 [28]
( 27) |11111111|11111111|11111111|0111 ffffff7 [28]
( 28) |11111111|11111111|11111111|1000 ffffff8 [28]
( 29) |11111111|11111111|11111111|1001 ffffff9 [28]
( 30) |11111111|11111111|11111111|1010 ffffffa [28]
( 31) |11111111|11111111|11111111|1011 ffffffb [28]
(127) |11111111|11111111|11111111|1100 ffffffc [28]
(220) |11111111|11111111|11111111|1101 ffffffd [28]
(249) |11111111|11111111|11111111|1110 ffffffe [28]
( 10) |11111111|11111111|11111111|111100 3ffffffc [30]
( 13) |11111111|11111111|11111111|111101 3ffffffd [30]
( 22) |11111111|11111111|11111111|111110 3ffffffe [30]
(256) |11111111|11111111|11111111|111111 3fffffff [30]
*/
struct {
uint8_t decoded;
uint8_t bitcount;
uint32_t encoded;
} hpack_huff_dec[] = {
{48, 5, 0x0},
{49, 5, 0x1},
{50, 5, 0x2},
{97, 5, 0x3},
{99, 5, 0x4},
{101, 5, 0x5},
{105, 5, 0x6},
{111, 5, 0x7},
{115, 5, 0x8},
{116, 5, 0x9},
{32, 6, 0x14},
{37, 6, 0x15},
{45, 6, 0x16},
{46, 6, 0x17},
{47, 6, 0x18},
{51, 6, 0x19},
{52, 6, 0x1a},
{53, 6, 0x1b},
{54, 6, 0x1c},
{55, 6, 0x1d},
{56, 6, 0x1e},
{57, 6, 0x1f},
{61, 6, 0x20},
{65, 6, 0x21},
{95, 6, 0x22},
{98, 6, 0x23},
{100, 6, 0x24},
{102, 6, 0x25},
{103, 6, 0x26},
{104, 6, 0x27},
{108, 6, 0x28},
{109, 6, 0x29},
{110, 6, 0x2a},
{112, 6, 0x2b},
{114, 6, 0x2c},
{117, 6, 0x2d},
{58, 7, 0x5c},
{66, 7, 0x5d},
{67, 7, 0x5e},
{68, 7, 0x5f},
{69, 7, 0x60},
{70, 7, 0x61},
{71, 7, 0x62},
{72, 7, 0x63},
{73, 7, 0x64},
{74, 7, 0x65},
{75, 7, 0x66},
{76, 7, 0x67},
{77, 7, 0x68},
{78, 7, 0x69},
{79, 7, 0x6a},
{80, 7, 0x6b},
{81, 7, 0x6c},
{82, 7, 0x6d},
{83, 7, 0x6e},
{84, 7, 0x6f},
{85, 7, 0x70},
{86, 7, 0x71},
{87, 7, 0x72},
{89, 7, 0x73},
{106, 7, 0x74},
{107, 7, 0x75},
{113, 7, 0x76},
{118, 7, 0x77},
{119, 7, 0x78},
{120, 7, 0x79},
{121, 7, 0x7a},
{122, 7, 0x7b},
{38, 8, 0xf8},
{42, 8, 0xf9},
{44, 8, 0xfa},
{59, 8, 0xfb},
{88, 8, 0xfc},
{90, 8, 0xfd},
{33, 10, 0x3f8},
{34, 10, 0x3f9},
{40, 10, 0x3fa},
{41, 10, 0x3fb},
{63, 10, 0x3fc},
{39, 11, 0x7fa},
{43, 11, 0x7fb},
{124, 11, 0x7fc},
{35, 12, 0xffa},
{62, 12, 0xffb},
{0, 13, 0x1ff8},
{36, 13, 0x1ff9},
{64, 13, 0x1ffa},
{91, 13, 0x1ffb},
{93, 13, 0x1ffc},
{126, 13, 0x1ffd},
{94, 14, 0x3ffc},
{125, 14, 0x3ffd},
{60, 15, 0x7ffc},
{96, 15, 0x7ffd},
{123, 15, 0x7ffe},
{92, 19, 0x7fff0},
{195, 19, 0x7fff1},
{208, 19, 0x7fff2},
{128, 20, 0xfffe6},
{130, 20, 0xfffe7},
{131, 20, 0xfffe8},
{162, 20, 0xfffe9},
{184, 20, 0xfffea},
{194, 20, 0xfffeb},
{224, 20, 0xfffec},
{226, 20, 0xfffed},
{153, 21, 0x1fffdc},
{161, 21, 0x1fffdd},
{167, 21, 0x1fffde},
{172, 21, 0x1fffdf},
{176, 21, 0x1fffe0},
{177, 21, 0x1fffe1},
{179, 21, 0x1fffe2},
{209, 21, 0x1fffe3},
{216, 21, 0x1fffe4},
{217, 21, 0x1fffe5},
{227, 21, 0x1fffe6},
{229, 21, 0x1fffe7},
{230, 21, 0x1fffe8},
{129, 22, 0x3fffd2},
{132, 22, 0x3fffd3},
{133, 22, 0x3fffd4},
{134, 22, 0x3fffd5},
{136, 22, 0x3fffd6},
{146, 22, 0x3fffd7},
{154, 22, 0x3fffd8},
{156, 22, 0x3fffd9},
{160, 22, 0x3fffda},
{163, 22, 0x3fffdb},
{164, 22, 0x3fffdc},
{169, 22, 0x3fffdd},
{170, 22, 0x3fffde},
{173, 22, 0x3fffdf},
{178, 22, 0x3fffe0},
{181, 22, 0x3fffe1},
{185, 22, 0x3fffe2},
{186, 22, 0x3fffe3},
{187, 22, 0x3fffe4},
{189, 22, 0x3fffe5},
{190, 22, 0x3fffe6},
{196, 22, 0x3fffe7},
{198, 22, 0x3fffe8},
{228, 22, 0x3fffe9},
{232, 22, 0x3fffea},
{233, 22, 0x3fffeb},
{1, 23, 0x7fffd8},
{135, 23, 0x7fffd9},
{137, 23, 0x7fffda},
{138, 23, 0x7fffdb},
{139, 23, 0x7fffdc},
{140, 23, 0x7fffdd},
{141, 23, 0x7fffde},
{143, 23, 0x7fffdf},
{147, 23, 0x7fffe0},
{149, 23, 0x7fffe1},
{150, 23, 0x7fffe2},
{151, 23, 0x7fffe3},
{152, 23, 0x7fffe4},
{155, 23, 0x7fffe5},
{157, 23, 0x7fffe6},
{158, 23, 0x7fffe7},
{165, 23, 0x7fffe8},
{166, 23, 0x7fffe9},
{168, 23, 0x7fffea},
{174, 23, 0x7fffeb},
{175, 23, 0x7fffec},
{180, 23, 0x7fffed},
{182, 23, 0x7fffee},
{183, 23, 0x7fffef},
{188, 23, 0x7ffff0},
{191, 23, 0x7ffff1},
{197, 23, 0x7ffff2},
{231, 23, 0x7ffff3},
{239, 23, 0x7ffff4},
{9, 24, 0xffffea},
{142, 24, 0xffffeb},
{144, 24, 0xffffec},
{145, 24, 0xffffed},
{148, 24, 0xffffee},
{159, 24, 0xffffef},
{171, 24, 0xfffff0},
{206, 24, 0xfffff1},
{215, 24, 0xfffff2},
{225, 24, 0xfffff3},
{236, 24, 0xfffff4},
{237, 24, 0xfffff5},
{199, 25, 0x1ffffec},
{207, 25, 0x1ffffed},
{234, 25, 0x1ffffee},
{235, 25, 0x1ffffef},
{192, 26, 0x3ffffe0},
{193, 26, 0x3ffffe1},
{200, 26, 0x3ffffe2},
{201, 26, 0x3ffffe3},
{202, 26, 0x3ffffe4},
{205, 26, 0x3ffffe5},
{210, 26, 0x3ffffe6},
{213, 26, 0x3ffffe7},
{218, 26, 0x3ffffe8},
{219, 26, 0x3ffffe9},
{238, 26, 0x3ffffea},
{240, 26, 0x3ffffeb},
{242, 26, 0x3ffffec},
{243, 26, 0x3ffffed},
{255, 26, 0x3ffffee},
{203, 27, 0x7ffffde},
{204, 27, 0x7ffffdf},
{211, 27, 0x7ffffe0},
{212, 27, 0x7ffffe1},
{214, 27, 0x7ffffe2},
{221, 27, 0x7ffffe3},
{222, 27, 0x7ffffe4},
{223, 27, 0x7ffffe5},
{241, 27, 0x7ffffe6},
{244, 27, 0x7ffffe7},
{245, 27, 0x7ffffe8},
{246, 27, 0x7ffffe9},
{247, 27, 0x7ffffea},
{248, 27, 0x7ffffeb},
{250, 27, 0x7ffffec},
{251, 27, 0x7ffffed},
{252, 27, 0x7ffffee},
{253, 27, 0x7ffffef},
{254, 27, 0x7fffff0},
{2, 28, 0xfffffe2},
{3, 28, 0xfffffe3},
{4, 28, 0xfffffe4},
{5, 28, 0xfffffe5},
{6, 28, 0xfffffe6},
{7, 28, 0xfffffe7},
{8, 28, 0xfffffe8},
{11, 28, 0xfffffe9},
{12, 28, 0xfffffea},
{14, 28, 0xfffffeb},
{15, 28, 0xfffffec},
{16, 28, 0xfffffed},
{17, 28, 0xfffffee},
{18, 28, 0xfffffef},
{19, 28, 0xffffff0},
{20, 28, 0xffffff1},
{21, 28, 0xffffff2},
{23, 28, 0xffffff3},
{24, 28, 0xffffff4},
{25, 28, 0xffffff5},
{26, 28, 0xffffff6},
{27, 28, 0xffffff7},
{28, 28, 0xffffff8},
{29, 28, 0xffffff9},
{30, 28, 0xffffffa},
{31, 28, 0xffffffb},
{127, 28, 0xffffffc},
{220, 28, 0xffffffd},
{249, 28, 0xffffffe},
{10, 30, 0x3ffffffc},
{13, 30, 0x3ffffffd},
{22, 30, 0x3ffffffe},
{(uint8_t)256, 30, 0x3fffffff} /* filling/termination */
};
/* highest value with 5, 6, 7, ... 28, 29, 30 and all (32) bits */
uint32_t hpack_huff_end_code[] = {0x9, 0x2d, 0x7b, 0xfd,
0, 0x3fc, 0x7fc, 0xffb,
0x1ffd, 0x3ffd, 0x7ffe, 0,
0, 0, 0x7fff2, 0xfffed,
0x1fffe8, 0x3fffeb, 0x7ffff4, 0xfffff5,
0x1ffffef, 0x3ffffee, 0x7fffff0, 0xffffffe,
0, 0x3ffffffe, 0xFFFFFFFFu};
/* lowest index with 5, 6, 7, ... 28, 29, 30 and all (32) bits */
uint8_t hpack_huff_start_index[] = {0, 10, 36, 68, 0, 74, 79, 82, 84,
90, 92, 0, 0, 0, 95, 98, 106, 119,
145, 174, 186, 190, 205, 224, 0, 253, 0};
/* Function to decode an integer from a HPACK encoded block */
/* Integers have a variable size encoding, according to the RFC.
* The integer starts at index *i, idx_mask masks the available bits in
* the first byte. The index *i is advanced until the end of the
* encoded integer.
*/
static uint64_t
hpack_getnum(const uint8_t *buf,
int *i,
uint8_t idx_mask,
struct mg_context *ctx)
{
uint64_t num = (buf[*i] & idx_mask);
(void)ctx;
if (num == idx_mask) {
/* Algorithm from https://tools.ietf.org/html/rfc7541#section-5.1 */
uint32_t M = 0;
do {
(*i)++;
num = num + ((buf[*i] & 0x7F) << M);
M += 7;
} while ((buf[*i] & 0x80) == 0x80);
}
(*i)++;
return num;
}
/* Function to decode a string from a HPACK encoded block */
/* Strings have a variable size and can be either encoded directly (8 bits
* per char), or using huffman encoding (variable bits per char).
* The string starts at index *i. This index is advanced until the end of
* the encoded string.
*/
static char *
hpack_decode(const uint8_t *buf, int *i, struct mg_context *ctx)
{
uint64_t byte_len64;
int byte_len;
int bit_len;
uint8_t is_huff = ((buf[*i] & 0x80) == 0x80);
/* Get length of string in bytes */
byte_len64 = hpack_getnum(buf, i, 0x7f, ctx);
if (byte_len64 > 1024) {
/* TODO */
return NULL;
}
byte_len = (int)byte_len64;
bit_len = byte_len * 8;
/* Now read the string */
if (!is_huff) {
/* Not huffman encoded: Copy directly */
char *result = (char *)mg_malloc_ctx(byte_len + 1, ctx);
if (result) {
memcpy(result, buf + (*i), byte_len);
result[byte_len] = 0;
}
(*i) += byte_len;
return result;
} else {
/* Huffman encoded: need to decode bitwise */
const uint8_t *pData =
buf + (*i); /* begin pointer of bit input string */
int bitRead = 0; /* number of encoded bits read */
uint32_t bytesStored = 0; /* number of decoded bytes stored */
uint8_t str[2048]; /* storage buffer for decoded string */
for (;;) {
uint32_t accu = 0; /* accu register: collect bits */
uint8_t bc = 0; /* number of bits collected */
int n;
/* Collect bits in this loop, until we have a valid huff code in
* accu */
do {
accu <<= 1;
accu |= (pData[bitRead / 8] >> (7 - (bitRead & 7))) & 1;
bitRead++;
bc++;
if (bitRead > bit_len) {
/* We used all bits. Return the decoded string. */
str[bytesStored] = 0; /* Terminate string */
(*i) += byte_len; /* Advance parsing index */
return mg_strdup_ctx((char *)str,
ctx); /* Return a string copy */
}
} while ((bc < 5) || (accu > hpack_huff_end_code[bc - 5]));
/* Find matching code in huffman encoding table */
for (n = hpack_huff_start_index[bc - 5]; n < 256; n++) {
if (accu == hpack_huff_dec[n].encoded) {
str[bytesStored] = hpack_huff_dec[n].decoded;
bytesStored++;
break;
}
}
}
}
}
static void
append_bits(uint8_t *target,
uint32_t offset,
uint32_t value,
uint8_t value_bits)
{
uint32_t offset_bytes = offset / 8;
uint32_t offset_bits = offset % 8;
uint32_t remaining_bits, ac;
value &= ~(0xFFFFFFFF << value_bits);
remaining_bits = 8 - offset_bits;
if (value_bits <= remaining_bits) {
ac = value << (remaining_bits - value_bits);
target[offset_bytes] |= ac;
return;
}
ac = value >> (value_bits - remaining_bits);
target[offset_bytes] |= ac;
append_bits(target,
offset + remaining_bits,
value,
value_bits - remaining_bits);
}
static int
hpack_encode(uint8_t *store, const char *load, int lower)
{
uint32_t nohuff_len = strlen(load);
uint32_t len_bits = 0;
uint32_t len_bytes;
uint32_t spare_bits;
uint32_t i;
memset(store, 0, nohuff_len + 1);
for (i = 0; i < nohuff_len; i++) {
uint8_t b = (uint8_t)((char)(lower ? tolower(load[i]) : load[i]));
int idx;
for (idx = 0; idx <= 255; idx++) {
if (hpack_huff_dec[idx].decoded == b) {
append_bits((uint8_t *)store + 1,
len_bits,
hpack_huff_dec[idx].encoded,
hpack_huff_dec[idx].bitcount);
len_bits += hpack_huff_dec[idx].bitcount;
break;
}
}
}
len_bytes = (len_bits + 7) / 8;
spare_bits = len_bytes * 8 - len_bits;
if (spare_bits) {
append_bits((uint8_t *)store + 1, len_bits, 0xFFFFFFFF, spare_bits);
}
if (len_bytes >= 127) {
// TODO: Shift string and encode len in more bytes
return 0;
}
*store = 0x80 + (uint8_t)len_bytes;
if ((len_bytes >= nohuff_len) && (0)) {
*store = (uint8_t)nohuff_len;
if (lower) {
for (i = 1; i <= nohuff_len; i++) {
store[i] = tolower(load[i]);
}
} else {
memcpy(store + 1, load, nohuff_len);
}
return nohuff_len + 1;
} else {
/*
int i = 0;
char *test = hpack_decode(store, &i, NULL);
i = i; // breakpoint for debugging / testing
*/
}
return len_bytes + 1;
}
/***********************************************************************/
/*** HTTP 2 ***/
/***********************************************************************/
static const char http2_pri[] = "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n";
static unsigned char http2_pri_len = 24; /* = strlen(http2_pri) */
/* Read and check the HTTP/2 primer/preface:
* See https://tools.ietf.org/html/rfc7540#section-3.5 */
static int
is_valid_http2_primer(struct mg_connection *conn)
{
size_t pri_len = http2_pri_len;
char buf[32];
if (pri_len > sizeof(buf)) {
/* Should never be reached - the RFC primer has 24 bytes */
return 0;
}
int read_pri_len = mg_read(conn, buf, pri_len);
if ((read_pri_len != (int)pri_len)
|| (0 != memcmp(buf, http2_pri, pri_len))) {
return 0;
}
return 1;
}
#define mg_xwrite(conn, data, len) \
push_all((conn)->phys_ctx, \
NULL, \
(conn)->client.sock, \
(conn)->ssl, \
(const char *)(data), \
(int)(len));
static void
http2_settings_acknowledge(struct mg_connection *conn)
{
unsigned char http2_set_ackn_frame[9] = {0, 0, 0, 4, 1, 0, 0, 0, 0};
DEBUG_TRACE("%s", "Sending settings frame");
mg_xwrite(conn, http2_set_ackn_frame, 9);
}
struct http2_settings {
uint32_t settings_header_table_size;
uint32_t settings_enable_push;
uint32_t settings_max_concurrent_streams;
uint32_t settings_initial_window_size;
uint32_t settings_max_frame_size;
uint32_t settings_max_header_list_size;
};
const struct http2_settings http2_default_settings =
{4096, 1, UINT32_MAX, 65535, 16384, UINT32_MAX};
const struct http2_settings http2_civetweb_server_settings =
{4096, 0, 100, 65535, 16384, 65535};
enum {
HTTP2_ERR_NO_ERROR = 0,
HTTP2_ERR_PROTOCOL_ERROR,
HTTP2_ERR_INTERNAL_ERROR,
HTTP2_ERR_FLOW_CONTROL_ERROR,
HTTP2_ERR_SETTINGS_TIMEOUT,
HTTP2_ERR_STREAM_CLOSED,
HTTP2_ERR_FRAME_SIZE_ERROR,
HTTP2_ERR_REFUSED_STREAM,
HTTP2_ERR_CANCEL,
HTTP2_ERR_COMPRESSION_ERROR,
HTTP2_ERR_CONNECT_ERROR,
HTTP2_ERR_ENHANCE_YOUR_CALM,
HTTP2_ERR_INADEQUATE_SECURITY,
HTTP2_ERR_HTTP_1_1_REQUIRED
};
static void
http2_send_settings(struct mg_connection *conn,
const struct http2_settings *set)
{
uint16_t id;
uint32_t data;
uint8_t http2_settings_frame[9] = {0, 0, 36, 4, 0, 0, 0, 0, 0};
mg_xwrite(conn, http2_settings_frame, 9);
id = htons(1);
data = htonl(set->settings_header_table_size);
mg_xwrite(conn, &id, 2);
mg_xwrite(conn, &data, 4);
id = htons(1);
data = htonl(set->settings_enable_push);
mg_xwrite(conn, &id, 2);
mg_xwrite(conn, &data, 4);
id = htons(1);
data = htonl(set->settings_max_concurrent_streams);
mg_xwrite(conn, &id, 2);
mg_xwrite(conn, &data, 4);
id = htons(1);
data = htonl(set->settings_initial_window_size);
mg_xwrite(conn, &id, 2);
mg_xwrite(conn, &data, 4);
id = htons(1);
data = htonl(set->settings_max_frame_size);
mg_xwrite(conn, &id, 2);
mg_xwrite(conn, &data, 4);
id = htons(1);
data = htonl(set->settings_max_header_list_size);
mg_xwrite(conn, &id, 2);
mg_xwrite(conn, &data, 4);
DEBUG_TRACE("%s", "HTTP2 settings sent");
}
static int
http2_send_response_headers(struct mg_connection *conn)
{
unsigned char http2_header_frame[9] = {0, 0, 0, 1, 4, 0, 0, 0, 0};
uint8_t header_bin[1024];
uint16_t header_len = 0;
int has_date = 0;
int has_connection_header = 0;
int i;
if ((conn->status_code < 100) || (conn->status_code > 999)) {
/* Invalid status: Set status to "Internal Server Error" */
conn->status_code = 500;
}
switch (conn->status_code) {
case 200:
header_bin[header_len++] = 0x88;
break;
case 204:
header_bin[header_len++] = 0x89;
break;
case 206:
header_bin[header_len++] = 0x8A;
break;
case 304:
header_bin[header_len++] = 0x8B;
break;
case 400:
header_bin[header_len++] = 0x8C;
break;
case 404:
header_bin[header_len++] = 0x8D;
break;
case 500:
header_bin[header_len++] = 0x8E;
break;
default:
header_bin[header_len++] = 0x48;
header_bin[header_len++] = 0x03;
header_bin[header_len++] = 0x30 + (conn->status_code / 100);
header_bin[header_len++] = 0x30 + ((conn->status_code / 10) % 10);
header_bin[header_len++] = 0x30 + (conn->status_code % 10);
break;
}
/* Add all headers */
for (i = 0; i < conn->response_info.num_headers; i++) {
uint16_t predef = 0;
uint16_t j;
/* Filter headers not valid in HTTP/2 */
if (!mg_strcasecmp("Connection",
conn->response_info.http_headers[i].name)) {
has_connection_header = 1;
continue; /* do not send */
}
/* Check if this header is known in HPACK (static table index 15 to 61)
* see https://tools.ietf.org/html/rfc7541#appendix-A */
for (j = 15; j <= 61; j++) {
if (!mg_strcasecmp(hpack_predefined[j].name,
conn->response_info.http_headers[i].name)) {
predef = j;
break;
}
}
if (predef) {
/* Predefined header found */
header_bin[header_len++] = 0x40 + predef;
} else {
/* Rare header, do not index */
header_bin[header_len++] = 0x10;
j = hpack_encode(header_bin + header_len,
conn->response_info.http_headers[i].name,
1);
header_len += j;
}
j = hpack_encode(header_bin + header_len,
conn->response_info.http_headers[i].value,
0);
header_len += j;
/* Mark required headers as sent */
if (!mg_strcasecmp("Date", conn->response_info.http_headers[i].name)) {
has_date = 1;
}
}
/* Add required headers, if they have not been sent yet */
if (!has_date) {
/* Create header frame */
char date[64];
uint8_t date_len;
time_t curtime = time(NULL);
gmt_time_string(date, sizeof(date), &curtime);
date_len = (uint8_t)strlen(date);
header_bin[header_len++] =
0x61; /* "Date" predefined HPACK index 33 (0x21) + 0x40 */
header_bin[header_len++] = date_len;
memcpy(header_bin + header_len, date, date_len);
header_len += date_len;
}
http2_header_frame[1] = (header_len & 0xFF00) >> 8;
http2_header_frame[2] = (header_len & 0xFF);
http2_header_frame[5] = (conn->http2.stream_id & 0xFF000000u) >> 24;
http2_header_frame[6] = (conn->http2.stream_id & 0xFF0000u) >> 16;
http2_header_frame[7] = (conn->http2.stream_id & 0xFF00u) >> 8;
http2_header_frame[8] = (conn->http2.stream_id & 0xFFu);
/* Send header frame */
mg_xwrite(conn, http2_header_frame, 9);
mg_xwrite(conn, header_bin, header_len);
DEBUG_TRACE("HTTP2 response header sent: stream %u", conn->http2.stream_id);
(void)has_connection_header; /* ignore for the moment */
return 42; /* TODO */
}
static void
http2_data_frame_head(struct mg_connection *conn,
uint32_t frame_size,
int is_final)
{
unsigned char http2_data_frame[9];
uint32_t stream_id = conn->http2.stream_id;
http2_data_frame[0] = (frame_size & 0xFF0000) >> 16;
http2_data_frame[1] = (frame_size & 0xFF00) >> 8;
http2_data_frame[2] = (frame_size & 0xFF);
http2_data_frame[3] = 0; /* frame type "DATA" */
http2_data_frame[4] = (is_final ? 1 : 0);
http2_data_frame[5] = (stream_id & 0xFF000000u) >> 24;
http2_data_frame[6] = (stream_id & 0xFF0000u) >> 16;
http2_data_frame[7] = (stream_id & 0xFF00u) >> 8;
http2_data_frame[8] = (stream_id & 0xFFu);
DEBUG_TRACE("HTTP2 begin data frame: stream %u, frame_size %u (final: %i)",
stream_id,
frame_size,
is_final);
mg_xwrite(conn, http2_data_frame, 9);
}
static void
http2_send_window(struct mg_connection *conn,
uint32_t stream_id,
uint32_t window_size)
{
unsigned char http2_window_frame[9] = {0, 0, 4, 8, 0, 0, 0, 0, 0};
uint32_t data = htonl(window_size);
DEBUG_TRACE("HTTP2 send window_size: stream %u, error %u",
stream_id,
window_size);
http2_window_frame[5] = (stream_id & 0xFF000000u) >> 24;
http2_window_frame[6] = (stream_id & 0xFF0000u) >> 16;
http2_window_frame[7] = (stream_id & 0xFF00u) >> 8;
http2_window_frame[8] = (stream_id & 0xFFu);
mg_xwrite(conn, http2_window_frame, 9);
mg_xwrite(conn, &data, 4);
}
static void
http2_reset_stream(struct mg_connection *conn,
uint32_t stream_id,
uint32_t error_id)
{
unsigned char http2_reset_frame[9] = {0, 0, 4, 3, 0, 0, 0, 0, 0};
uint32_t val = htonl(error_id);
DEBUG_TRACE("HTTP2 send reset: stream %u, error %u", stream_id, error_id);
http2_reset_frame[5] = (stream_id & 0xFF000000u) >> 24;
http2_reset_frame[6] = (stream_id & 0xFF0000u) >> 16;
http2_reset_frame[7] = (stream_id & 0xFF00u) >> 8;
http2_reset_frame[8] = (stream_id & 0xFFu);
mg_xwrite(conn, http2_reset_frame, 9);
mg_xwrite(conn, &val, 4);
}
static void
http2_must_use_http1(struct mg_connection *conn)
{
DEBUG_TRACE("HTTP2 not available for this URL (%s)", conn->path_info);
http2_reset_stream(conn, conn->http2.stream_id, 0xd);
}
/* The HTTP2 implementation collects request headers as array of dynamically
* allocated string values. This array must be freed once the request is
* handled.
* This is different to the HTTP/1.x implementation: For HTTP/1.x, the header
* list is implemented as pointers into an existing buffer, so free must not
* be called for HTTP/1.x.
* Thus free_buffered_request_header_list is in mod_http2.inl.
*/
#if defined(DEBUG)
static int mem_h_count = 0;
static int mem_d_count = 0;
#define CHECK_LEAK_HDR_ALLOC(ptr) \
DEBUG_TRACE("H NEW %p (%i): %s", ptr, ++mem_h_count, (const char *)ptr)
#define CHECK_LEAK_HDR_FREE(ptr) \
DEBUG_TRACE("H DEL %p (%i): %s", ptr, --mem_h_count, (const char *)ptr)
#define CHECK_LEAK_DYN_ALLOC(ptr) \
DEBUG_TRACE("D NEW %p (%i): %s", ptr, ++mem_d_count, (const char *)ptr)
#define CHECK_LEAK_DYN_FREE(ptr) \
DEBUG_TRACE("D DEL %p (%i): %s", ptr, --mem_d_count, (const char *)ptr)
#else
#define CHECK_LEAK_HDR_ALLOC(ptr)
#define CHECK_LEAK_HDR_FREE(ptr)
#define CHECK_LEAK_DYN_ALLOC(ptr)
#define CHECK_LEAK_DYN_FREE(ptr)
#endif
/* The dynamic header table may be resized on a HTTP2 client request.
* A tablesize=0 will free all memory.
*/
static void
purge_dynamic_header_table(struct mg_connection *conn, uint32_t tableSize)
{
DEBUG_TRACE("HTTP2 dynamic header table set to %u", tableSize);
while (conn->http2.dyn_table_size > tableSize) {
conn->http2.dyn_table_size--;
CHECK_LEAK_DYN_FREE(
conn->http2.dyn_table[conn->http2.dyn_table_size].name);
CHECK_LEAK_DYN_FREE(
conn->http2.dyn_table[conn->http2.dyn_table_size].value);
mg_free((void *)conn->http2.dyn_table[conn->http2.dyn_table_size].name);
conn->http2.dyn_table[conn->http2.dyn_table_size].name = 0;
mg_free(
(void *)conn->http2.dyn_table[conn->http2.dyn_table_size].value);
conn->http2.dyn_table[conn->http2.dyn_table_size].value = 0;
}
}
/* Internal function to free request header list.
* Not to be confused with the response header list.
*/
static void
free_buffered_request_header_list(struct mg_connection *conn)
{
while (conn->request_info.num_headers > 0) {
conn->request_info.num_headers--;
CHECK_LEAK_HDR_FREE(
conn->request_info.http_headers[conn->request_info.num_headers]
.name);
CHECK_LEAK_HDR_FREE(
conn->request_info.http_headers[conn->request_info.num_headers]
.value);
mg_free((void *)conn->request_info
.http_headers[conn->request_info.num_headers]
.name);
conn->request_info.http_headers[conn->request_info.num_headers].name =
0;
mg_free((void *)conn->request_info
.http_headers[conn->request_info.num_headers]
.value);
conn->request_info.http_headers[conn->request_info.num_headers].value =
0;
}
}
/* HTTP2 requires a different handling loop */
static void
handle_http2(struct mg_connection *conn)
{
unsigned char http2_frame_head[9];
uint32_t http2_frame_size;
uint8_t http2_frame_type;
uint8_t http2_frame_flags;
uint32_t http2_frame_stream_id;
uint32_t http_window_length = 0;
int bytes_read;
uint8_t *buf;
int my_settings_accepted = 0;
const char *my_hpack_headers[128];
struct http2_settings client_settings = http2_default_settings;
struct http2_settings server_settings = http2_default_settings;
/* Send own settings */
http2_send_settings(conn, &http2_civetweb_server_settings);
// http2_send_window(conn, 0, /* 0x3fff0001 */ 1024*1024);
/* initialize hpack header table with predefined header fields */
memset((void *)my_hpack_headers, 0, sizeof(my_hpack_headers));
memcpy((void *)my_hpack_headers,
hpack_predefined,
sizeof(hpack_predefined));
buf = (uint8_t *)mg_malloc_ctx(server_settings.settings_max_frame_size,
conn->phys_ctx);
if (!buf) {
/* Out of memory */
DEBUG_TRACE("%s", "Out of memory for HTTP2 frame");
return;
}
for (;;) {
/* HTTP/2 is handled frame by frame */
int frame_is_end_stream = 0;
int frame_is_end_headers = 0;
int frame_is_padded = 0;
int frame_is_priority = 0;
#if defined(USE_SERVER_STATS)
conn->conn_state = 3; /* HTTP/2 ready */
#endif
bytes_read = mg_read(conn, http2_frame_head, sizeof(http2_frame_head));
if (bytes_read != sizeof(http2_frame_head)) {
/* TODO: errormsg */
goto clean_http2;
}
/* Extract data from frame header */
http2_frame_size = ((uint32_t)http2_frame_head[0] * 0x10000u)
+ ((uint32_t)http2_frame_head[1] * 0x100u)
+ ((uint32_t)http2_frame_head[2]);
http2_frame_type = http2_frame_head[3];
http2_frame_flags = http2_frame_head[4];
http2_frame_stream_id = ((uint32_t)http2_frame_head[5] * 0x1000000u)
+ ((uint32_t)http2_frame_head[6] * 0x10000u)
+ ((uint32_t)http2_frame_head[7] * 0x100u)
+ ((uint32_t)http2_frame_head[8]);
frame_is_end_stream = (0 != (http2_frame_flags & 0x01));
frame_is_end_headers = (0 != (http2_frame_flags & 0x04));
frame_is_padded = (0 != (http2_frame_flags & 0x08));
frame_is_priority = (0 != (http2_frame_flags & 0x20));
if (http2_frame_size > server_settings.settings_max_frame_size) {
/* TODO: Error Message */
DEBUG_TRACE("HTTP2 frame too large (%lu)",
(unsigned long)http2_frame_size);
goto clean_http2;
}
bytes_read = mg_read(conn, buf, http2_frame_size);
if (bytes_read != (int)http2_frame_size) {
/* TODO: Error Message - or read again? */
DEBUG_TRACE("HTTP2 read error (%li != %li)",
(signed long int)bytes_read,
(signed long int)http2_frame_size);
goto clean_http2;
}
DEBUG_TRACE("HTTP2 frame type %u, size %u, stream %u, flags %02x",
http2_frame_type,
http2_frame_size,
http2_frame_stream_id,
http2_frame_flags);
/* Further processing according to frame type. See definition: */
/* https://tools.ietf.org/html/rfc7540#section-6 */
switch (http2_frame_type) {
case 0: /* DATA */
{
/* TODO */
DEBUG_TRACE("%s", "HTTP2 DATA frame?");
} break;
case 1: /* HEADERS */
{
int i = 0;
uint8_t padding = 0;
uint32_t dependency = 0;
uint8_t weight = 0;
uint8_t exclusive = 0;
/* Request start time */
clock_gettime(CLOCK_MONOTONIC, &(conn->req_time));
if (frame_is_padded) {
padding = buf[i];
i++;
DEBUG_TRACE("HTTP2 frame padded by %u bytes", padding);
}
if (frame_is_priority) {
uint32_t val = ((uint32_t)buf[0 + i] * 0x1000000u)
+ ((uint32_t)buf[1 + i] * 0x10000u)
+ ((uint32_t)buf[2 + i] * 0x100u)
+ ((uint32_t)buf[3 + i]);
dependency = (val & 0x7FFFFFFFu);
exclusive = ((val & 0x80000000u) != 0);
weight = buf[4 + i];
i += 5;
DEBUG_TRACE(
"HTTP2 frame weight %u, dependency %u (exclusive: %i)",
weight,
dependency,
exclusive);
}
conn->request_info.num_headers = 0;
while (i < (int)http2_frame_size - (int)padding) {
const char *key = 0;
const char *val = 0;
uint8_t idx_mask = 0;
uint8_t value_known = 0;
uint8_t indexing = 0;
uint64_t idx = 0;
/* Classify next entry by checking the bit mask */
if ((buf[i] & 0x80u) == 0x80u) {
/* Indexed Header Field Representation:
* https://tools.ietf.org/html/rfc7541#section-6.1 */
idx_mask = 0x7fu;
value_known = 1;
} else if ((buf[i] & 0xC0u) == 0x40u) {
/* Literal Header Field with Incremental Indexing:
* https://tools.ietf.org/html/rfc7541#section-6.2.1 */
idx_mask = 0x3fu;
indexing = 1;
} else if ((buf[i] & 0xF0u) == 0x00u) {
/* Literal Header Field without Indexing:
* https://tools.ietf.org/html/rfc7541#section-6.2.2 */
idx_mask = 0x0fu;
} else if ((buf[i] & 0xF0u) == 0x10u) {
/* Literal Header Field Never Indexed:
* https://tools.ietf.org/html/rfc7541#section-6.2.3 */
idx_mask = 0x0fu;
} else if ((buf[i] & 0xE0u) == 0x20u) {
uint64_t tableSize;
/* Dynamic Table Size Update:
* https://tools.ietf.org/html/rfc7541#section-6.3 */
idx_mask = 0x1fu;
tableSize = hpack_getnum(buf, &i, idx_mask, conn->phys_ctx);
/* TODO: check if tablesize > allowed table size */
/* Purge additional table entries */
purge_dynamic_header_table(conn, (uint32_t)tableSize);
/* Process next frame */
continue;
} else {
DEBUG_TRACE("HTTP2 unknown start pattern %02x", buf[i]);
goto clean_http2;
}
/* Get the header name table index */
idx = hpack_getnum(buf, &i, idx_mask, conn->phys_ctx);
/* Get Header name "key" */
if (idx == 0) {
/* Index 0: Header name encoded in following bytes */
key = hpack_decode(buf, &i, conn->phys_ctx);
CHECK_LEAK_HDR_ALLOC(key);
} else if (/*(idx >= 15) &&*/ (idx <= 61)) {
/* Take key name from predefined header table */
key = mg_strdup_ctx(hpack_predefined[idx].name,
conn->phys_ctx); /* leak? */
CHECK_LEAK_HDR_ALLOC(key);
} else if ((idx >= 62)
&& ((idx - 61) <= conn->http2.dyn_table_size)) {
/* Take from dynamic header table */
uint32_t local_table_idx = (uint32_t)idx - 62;
key = mg_strdup_ctx(
conn->http2.dyn_table[local_table_idx].name,
conn->phys_ctx);
CHECK_LEAK_HDR_ALLOC(key);
} else {
/* protocol violation */
DEBUG_TRACE("HTTP2 invalid index %lu", (unsigned long)idx);
goto clean_http2;
}
/* key is allocated now and must be freed later */
/* Get header value */
if (value_known) {
/* Server must already know the value */
if (idx <= 61) {
if (hpack_predefined[idx].value) {
val = mg_strdup_ctx(hpack_predefined[idx].value,
conn->phys_ctx); /* leak? */
CHECK_LEAK_HDR_ALLOC(val);
} else {
/* protocol violation */
DEBUG_TRACE("HTTP2 indexed header %lu has no value "
"(key: %s)",
(unsigned long)idx,
key);
CHECK_LEAK_HDR_FREE(key);
mg_free((void *)key);
goto clean_http2;
}
} else if ((idx >= 62)
&& ((idx - 61) <= conn->http2.dyn_table_size)) {
uint32_t local_table_idx = (uint32_t)idx - 62;
val = mg_strdup_ctx(
conn->http2.dyn_table[local_table_idx].value,
conn->phys_ctx);
CHECK_LEAK_HDR_ALLOC(val);
} else {
/* protocol violation */
DEBUG_TRACE(
"HTTP2 indexed header %lu out of range (key: %s)",
(unsigned long)idx,
key);
CHECK_LEAK_HDR_FREE(key);
mg_free((void *)key);
goto clean_http2;
}
} else {
/* Read value from HTTP2 stream */
val = hpack_decode(buf, &i, conn->phys_ctx); /* leak? */
CHECK_LEAK_HDR_ALLOC(val);
if (indexing) {
/* Add to index */
if (conn->http2.dyn_table_size
>= HTTP2_DYN_TABLE_SIZE) {
/* Too many elements */
DEBUG_TRACE("HTTP2 index table is full (key: %s, "
"value: %s)",
key,
val);
CHECK_LEAK_HDR_FREE(key);
CHECK_LEAK_HDR_FREE(val);
mg_free((void *)key);
mg_free((void *)val);
goto clean_http2;
}
/* Add to table of dynamic headers */
conn->http2.dyn_table[conn->http2.dyn_table_size].name =
mg_strdup_ctx(key, conn->phys_ctx); /* leak */
conn->http2.dyn_table[conn->http2.dyn_table_size]
.value =
mg_strdup_ctx(val, conn->phys_ctx); /* leak */
CHECK_LEAK_DYN_ALLOC(
conn->http2.dyn_table[conn->http2.dyn_table_size]
.name);
CHECK_LEAK_DYN_ALLOC(
conn->http2.dyn_table[conn->http2.dyn_table_size]
.value);
conn->http2.dyn_table_size++;
DEBUG_TRACE("HTTP2 new dynamic header table entry %i "
"(key: %s, value: %s)",
(int)conn->http2.dyn_table_size,
key,
val);
}
}
/* val and key are allocated now and must be freed later */
/* Store these pointers in conn->request_info[].http_headers,
* free_buffered_header_list(conn) will clean up later. */
/* Add header for this request */
if ((key != NULL) && (val != NULL)
&& (conn->request_info.num_headers < MG_MAX_HEADERS)) {
conn->request_info
.http_headers[conn->request_info.num_headers]
.name = key;
conn->request_info
.http_headers[conn->request_info.num_headers]
.value = val;
conn->request_info.num_headers++;
/* Some headers need to be stored in the request structure
*/
if (!strcmp(":method", key)) {
conn->request_info.request_method = val;
} else if (!strcmp(":path", key)) {
conn->request_info.local_uri = val;
conn->request_info.request_uri = val;
} else if (!strcmp(":status", key)) {
conn->status_code = atoi(val);
}
DEBUG_TRACE("HTTP2 request header (key: %s, value: %s)",
key,
val);
} else {
/* - either key or value are NULL (out of memory)
* - or the max. number of headers is reached
* in both cases free all memory
*/
DEBUG_TRACE("%s", "HTTP2 cannot add header");
CHECK_LEAK_HDR_FREE(key);
CHECK_LEAK_HDR_FREE(val);
mg_free((void *)key);
key = NULL;
mg_free((void *)val);
val = NULL;
}
}
/* stream id */
conn->http2.stream_id = http2_frame_stream_id;
/* header parsed */
DEBUG_TRACE("HTTP2 handle_request (stream %u)",
http2_frame_stream_id);
handle_request_stat_log(conn);
/* Send "final" frame */
DEBUG_TRACE("HTTP2 handle_request done (stream %u)",
http2_frame_stream_id);
http2_data_frame_head(conn, 0, 1);
free_buffered_response_header_list(conn);
free_buffered_request_header_list(conn);
} break;
case 2: /* PRIORITY */
{
uint32_t dependStream =
((uint32_t)buf[0] * 0x1000000u) + ((uint32_t)buf[1] * 0x10000u)
+ ((uint32_t)buf[2] * 0x100u) + ((uint32_t)buf[3]);
uint8_t weight = buf[4];
DEBUG_TRACE("HTTP2 priority %u dependent stream %u",
weight,
dependStream);
} break;
case 3: /* RST_STREAM */
{
uint32_t errorId =
((uint32_t)buf[0] * 0x1000000u) + ((uint32_t)buf[1] * 0x10000u)
+ ((uint32_t)buf[2] * 0x100u) + ((uint32_t)buf[3]);
DEBUG_TRACE("HTTP2 reset with error %u", errorId);
} break;
case 4: /* SETTINGS */
if (http2_frame_stream_id != 0) {
/* Send protocol error */
http2_reset_stream(conn,
http2_frame_stream_id,
HTTP2_ERR_PROTOCOL_ERROR);
DEBUG_TRACE("%s", "HTTP2 received invalid settings frame");
} else if (http2_frame_flags) {
/* ACK frame. Do not reply. */
my_settings_accepted++;
DEBUG_TRACE("%s", "CivetWeb settings confirmed by peer");
} else {
int i;
for (i = 0; i < (int)http2_frame_size; i += 6) {
uint16_t id =
((uint16_t)buf[i] * 0x100u) + ((uint16_t)buf[i + 1]);
uint32_t val = ((uint32_t)buf[i + 2] * 0x1000000u)
+ ((uint32_t)buf[i + 3] * 0x10000u)
+ ((uint32_t)buf[i + 4] * 0x100u)
+ ((uint32_t)buf[i + 5]);
switch (id) {
case 1:
client_settings.settings_header_table_size = val;
DEBUG_TRACE("Received settings header_table_size: %u",
val);
break;
case 2:
client_settings.settings_enable_push = (val != 0);
DEBUG_TRACE("Received settings enable_push: %u", val);
break;
case 3:
client_settings.settings_max_concurrent_streams = val;
DEBUG_TRACE(
"Received settings max_concurrent_streams: %u",
val);
break;
case 4:
client_settings.settings_initial_window_size = val;
DEBUG_TRACE("Received settings initial_window_size: %u",
val);
break;
case 5:
client_settings.settings_max_frame_size = val;
DEBUG_TRACE("Received settings max_frame_size: %u",
val);
break;
case 6:
client_settings.settings_max_header_list_size = val;
DEBUG_TRACE(
"Received settings max_header_list_size: %u", val);
break;
default:
/* Unknown setting. Ignore it. */
DEBUG_TRACE("Received unknown settings id=%u: %u",
id,
val);
break;
}
}
/* Every settings frame must be acknowledged */
http2_settings_acknowledge(conn);
}
break;
case 5: /* PUSH_PROMISE */
DEBUG_TRACE("%s", "Push promise not supported");
break;
case 6: /* PING */
if (http2_frame_flags == 0) {
/* Set "reply" flag, and send same data back */
DEBUG_TRACE("%s", "Replying to ping");
http2_frame_head[4] = 1;
mg_xwrite(conn, http2_frame_head, sizeof(http2_frame_head));
mg_xwrite(conn, buf, http2_frame_size);
}
break;
case 7: /* GOAWAY */
{
uint32_t lastStream =
((uint32_t)buf[0] * 0x1000000u) + ((uint32_t)buf[1] * 0x10000u)
+ ((uint32_t)buf[2] * 0x100u) + ((uint32_t)buf[3]);
uint32_t errorId =
((uint32_t)buf[4] * 0x1000000u) + ((uint32_t)buf[5] * 0x10000u)
+ ((uint32_t)buf[6] * 0x100u) + ((uint32_t)buf[7]);
; /* followed by debug data */
uint32_t debugDataLen = http2_frame_size - 8;
char *debugData = (char *)buf + 8;
DEBUG_TRACE("HTTP2 goaway stream %u, error %u (%.*s)",
lastStream,
errorId,
debugDataLen,
debugData);
} break;
case 8: /* WINDOW_UPDATE */
{
uint32_t val = ((uint32_t)buf[0] * 0x1000000u)
+ ((uint32_t)buf[1] * 0x10000u)
+ ((uint32_t)buf[2] * 0x100u) + ((uint32_t)buf[3]);
http_window_length = (val & 0x7FFFFFFFu);
DEBUG_TRACE("HTTP2 window update stream %u, length %u",
http2_frame_stream_id,
http_window_length);
} break;
case 9: /* CONTINUATION */
DEBUG_TRACE("%s", "HTTP2 Continue");
break;
default:
/* TODO: Error Message */
DEBUG_TRACE("%s", "Unknown frame type");
goto clean_http2;
}
/* not used in the moment */
(void)frame_is_end_stream;
(void)frame_is_end_headers;
(void)client_settings;
}
clean_http2:
DEBUG_TRACE("%s", "HTTP2 free buffer, connection handler finished");
mg_free(buf);
}
#if 0
static void
HPACK_TEST()
{
uint64_t test;
for (test = 0;; test++) {
char in[32] = {0};
uint8_t out[32] = {0};
char *check;
int i;
int l;
memcpy(in, &test, sizeof(test));
l = hpack_encode(out, in, 0);
i = 0;
check = hpack_decode(out, &i, NULL);
if (strcmp(in, check)) {
printf("Error\n");
}
mg_free(check);
}
}
static void
HPACK_TABLE_TEST()
{
int i;
uint32_t hpack_huff_end_code_expected[32] = { 0 };
uint8_t hpack_huff_start_index_expected[32] = { 0 };
int reverse_map[256] = { 0 };
for (i = 0; i < 256; i++) {
reverse_map[i] = -1;
}
for (i = 0; i < 256; i++) {
uint8_t bits = hpack_huff_dec[i].bitcount;
uint8_t dec = hpack_huff_dec[i].decoded;
if (bits > hpack_huff_dec[i + 1].bitcount) {
ck_abort_msg("hpack_huff_dec disorder at index %i", i);
}
if (hpack_huff_dec[i].encoded & (0xFFFFFFFFul << bits)) {
ck_abort_msg("hpack_huff_dec bits inconsistent at index %i", i);
}
if ((bits < 5) || (bits > 30)) {
ck_abort_msg("hpack_huff_dec bits out of range at index %i", i);
}
if (reverse_map[dec] != -1) {
ck_abort_msg("hpack_huff_dec duplicate: %i", hpack_huff_dec[i].decoded);
}
reverse_map[dec] = i;
hpack_huff_end_code_expected[bits - 5] = hpack_huff_dec[i].encoded;
}
for (i = 255; i >= 0; i--) {
uint8_t bits = hpack_huff_dec[i].bitcount;
hpack_huff_start_index_expected[bits - 5] = i;
}
for (i = 0; i < 256; i++) {
if (reverse_map[i] == -1) {
ck_abort_msg("reverse map at %i mising", i);
}
}
i = sizeof(hpack_huff_start_index) / sizeof(hpack_huff_start_index[0]);
if (i != 27) {
ck_abort_msg("hpack_huff_start_index size error: ", i);
}
i = sizeof(hpack_huff_end_code) / sizeof(hpack_huff_end_code[0]);
if (i != 27) {
ck_abort_msg("hpack_huff_end_code size error: ", i);
}
for (i = 0; i < 27; i++) {
if (hpack_huff_start_index_expected[i] != hpack_huff_start_index[i]) {
ck_abort_msg("hpack_huff_start_index error at %i", i);
}
if (hpack_huff_end_code_expected[i] != hpack_huff_end_code[i]) {
ck_abort_msg("hpack_huff_end_code error at %i", i);
}
}
}
#endif
static void
process_new_http2_connection(struct mg_connection *conn)
{
if (!is_valid_http2_primer(conn)) {
/* Primer does not match expectation from RFC.
* See https://tools.ietf.org/html/rfc7540#section-3.5 */
DEBUG_TRACE("%s", "No valid HTTP2 primer");
mg_send_http_error(conn, 400, "%s", "Invalid HTTP/2 primer");
} else {
/* Valid HTTP/2 primer received */
DEBUG_TRACE("%s", "Start handling HTTP2");
handle_http2(conn);
/* Free memory allocated for headers, if not done yet */
DEBUG_TRACE("%s", "Free remaining HTTP2 header memory");
free_buffered_response_header_list(conn);
free_buffered_request_header_list(conn);
purge_dynamic_header_table(conn, 0);
}
}
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