/* * HPACK decompressor (RFC7541) * * Copyright (C) 2014-2017 Willy Tarreau * Copyright (C) 2017 HAProxy Technologies * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ #include #include #include #include #include #include #include /* * HPACK encoding: these tables were generated using gen-enc.c */ /* encoding of stream of compressed headers. This stream is composed of series * of *8b>. */ const char hpack_enc_stream[666] = { /* 0: */ 0x03, 0x15, 0x61, 0x67, 0x65, 0x03, 0x3c, 0x76, /* 8: */ 0x69, 0x61, 0x04, 0x21, 0x64, 0x61, 0x74, 0x65, /* 16: */ 0x04, 0x26, 0x68, 0x6f, 0x73, 0x74, 0x04, 0x22, /* 24: */ 0x65, 0x74, 0x61, 0x67, 0x04, 0x25, 0x66, 0x72, /* 32: */ 0x6f, 0x6d, 0x04, 0x2d, 0x6c, 0x69, 0x6e, 0x6b, /* 40: */ 0x04, 0x3b, 0x76, 0x61, 0x72, 0x79, 0x05, 0x04, /* 48: */ 0x3a, 0x70, 0x61, 0x74, 0x68, 0x05, 0x16, 0x61, /* 56: */ 0x6c, 0x6c, 0x6f, 0x77, 0x05, 0x32, 0x72, 0x61, /* 64: */ 0x6e, 0x67, 0x65, 0x06, 0x13, 0x61, 0x63, 0x63, /* 72: */ 0x65, 0x70, 0x74, 0x06, 0x36, 0x73, 0x65, 0x72, /* 80: */ 0x76, 0x65, 0x72, 0x06, 0x20, 0x63, 0x6f, 0x6f, /* 88: */ 0x6b, 0x69, 0x65, 0x06, 0x23, 0x65, 0x78, 0x70, /* 96: */ 0x65, 0x63, 0x74, 0x07, 0x33, 0x72, 0x65, 0x66, /* 104: */ 0x65, 0x72, 0x65, 0x72, 0x07, 0x24, 0x65, 0x78, /* 112: */ 0x70, 0x69, 0x72, 0x65, 0x73, 0x07, 0x02, 0x3a, /* 120: */ 0x6d, 0x65, 0x74, 0x68, 0x6f, 0x64, 0x07, 0x06, /* 128: */ 0x3a, 0x73, 0x63, 0x68, 0x65, 0x6d, 0x65, 0x07, /* 136: */ 0x08, 0x3a, 0x73, 0x74, 0x61, 0x74, 0x75, 0x73, /* 144: */ 0x07, 0x34, 0x72, 0x65, 0x66, 0x72, 0x65, 0x73, /* 152: */ 0x68, 0x08, 0x2e, 0x6c, 0x6f, 0x63, 0x61, 0x74, /* 160: */ 0x69, 0x6f, 0x6e, 0x08, 0x27, 0x69, 0x66, 0x2d, /* 168: */ 0x6d, 0x61, 0x74, 0x63, 0x68, 0x08, 0x2a, 0x69, /* 176: */ 0x66, 0x2d, 0x72, 0x61, 0x6e, 0x67, 0x65, 0x0a, /* 184: */ 0x3a, 0x75, 0x73, 0x65, 0x72, 0x2d, 0x61, 0x67, /* 192: */ 0x65, 0x6e, 0x74, 0x0a, 0x37, 0x73, 0x65, 0x74, /* 200: */ 0x2d, 0x63, 0x6f, 0x6f, 0x6b, 0x69, 0x65, 0x0a, /* 208: */ 0x01, 0x3a, 0x61, 0x75, 0x74, 0x68, 0x6f, 0x72, /* 216: */ 0x69, 0x74, 0x79, 0x0b, 0x35, 0x72, 0x65, 0x74, /* 224: */ 0x72, 0x79, 0x2d, 0x61, 0x66, 0x74, 0x65, 0x72, /* 232: */ 0x0c, 0x1f, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, /* 240: */ 0x74, 0x2d, 0x74, 0x79, 0x70, 0x65, 0x0c, 0x2f, /* 248: */ 0x6d, 0x61, 0x78, 0x2d, 0x66, 0x6f, 0x72, 0x77, /* 256: */ 0x61, 0x72, 0x64, 0x73, 0x0d, 0x18, 0x63, 0x61, /* 264: */ 0x63, 0x68, 0x65, 0x2d, 0x63, 0x6f, 0x6e, 0x74, /* 272: */ 0x72, 0x6f, 0x6c, 0x0d, 0x2c, 0x6c, 0x61, 0x73, /* 280: */ 0x74, 0x2d, 0x6d, 0x6f, 0x64, 0x69, 0x66, 0x69, /* 288: */ 0x65, 0x64, 0x0d, 0x12, 0x61, 0x63, 0x63, 0x65, /* 296: */ 0x70, 0x74, 0x2d, 0x72, 0x61, 0x6e, 0x67, 0x65, /* 304: */ 0x73, 0x0d, 0x29, 0x69, 0x66, 0x2d, 0x6e, 0x6f, /* 312: */ 0x6e, 0x65, 0x2d, 0x6d, 0x61, 0x74, 0x63, 0x68, /* 320: */ 0x0d, 0x17, 0x61, 0x75, 0x74, 0x68, 0x6f, 0x72, /* 328: */ 0x69, 0x7a, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x0d, /* 336: */ 0x1e, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74, /* 344: */ 0x2d, 0x72, 0x61, 0x6e, 0x67, 0x65, 0x0e, 0x1c, /* 352: */ 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74, 0x2d, /* 360: */ 0x6c, 0x65, 0x6e, 0x67, 0x74, 0x68, 0x0e, 0x0f, /* 368: */ 0x61, 0x63, 0x63, 0x65, 0x70, 0x74, 0x2d, 0x63, /* 376: */ 0x68, 0x61, 0x72, 0x73, 0x65, 0x74, 0x0f, 0x10, /* 384: */ 0x61, 0x63, 0x63, 0x65, 0x70, 0x74, 0x2d, 0x65, /* 392: */ 0x6e, 0x63, 0x6f, 0x64, 0x69, 0x6e, 0x67, 0x0f, /* 400: */ 0x11, 0x61, 0x63, 0x63, 0x65, 0x70, 0x74, 0x2d, /* 408: */ 0x6c, 0x61, 0x6e, 0x67, 0x75, 0x61, 0x67, 0x65, /* 416: */ 0x10, 0x1a, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, /* 424: */ 0x74, 0x2d, 0x65, 0x6e, 0x63, 0x6f, 0x64, 0x69, /* 432: */ 0x6e, 0x67, 0x10, 0x1b, 0x63, 0x6f, 0x6e, 0x74, /* 440: */ 0x65, 0x6e, 0x74, 0x2d, 0x6c, 0x61, 0x6e, 0x67, /* 448: */ 0x75, 0x61, 0x67, 0x65, 0x10, 0x1d, 0x63, 0x6f, /* 456: */ 0x6e, 0x74, 0x65, 0x6e, 0x74, 0x2d, 0x6c, 0x6f, /* 464: */ 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x10, 0x3d, /* 472: */ 0x77, 0x77, 0x77, 0x2d, 0x61, 0x75, 0x74, 0x68, /* 480: */ 0x65, 0x6e, 0x74, 0x69, 0x63, 0x61, 0x74, 0x65, /* 488: */ 0x11, 0x39, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x66, /* 496: */ 0x65, 0x72, 0x2d, 0x65, 0x6e, 0x63, 0x6f, 0x64, /* 504: */ 0x69, 0x6e, 0x67, 0x11, 0x28, 0x69, 0x66, 0x2d, /* 512: */ 0x6d, 0x6f, 0x64, 0x69, 0x66, 0x69, 0x65, 0x64, /* 520: */ 0x2d, 0x73, 0x69, 0x6e, 0x63, 0x65, 0x12, 0x30, /* 528: */ 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2d, 0x61, 0x75, /* 536: */ 0x74, 0x68, 0x65, 0x6e, 0x74, 0x69, 0x63, 0x61, /* 544: */ 0x74, 0x65, 0x13, 0x19, 0x63, 0x6f, 0x6e, 0x74, /* 552: */ 0x65, 0x6e, 0x74, 0x2d, 0x64, 0x69, 0x73, 0x70, /* 560: */ 0x6f, 0x73, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x13, /* 568: */ 0x2b, 0x69, 0x66, 0x2d, 0x75, 0x6e, 0x6d, 0x6f, /* 576: */ 0x64, 0x69, 0x66, 0x69, 0x65, 0x64, 0x2d, 0x73, /* 584: */ 0x69, 0x6e, 0x63, 0x65, 0x13, 0x31, 0x70, 0x72, /* 592: */ 0x6f, 0x78, 0x79, 0x2d, 0x61, 0x75, 0x74, 0x68, /* 600: */ 0x6f, 0x72, 0x69, 0x7a, 0x61, 0x74, 0x69, 0x6f, /* 608: */ 0x6e, 0x19, 0x38, 0x73, 0x74, 0x72, 0x69, 0x63, /* 616: */ 0x74, 0x2d, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, /* 624: */ 0x6f, 0x72, 0x74, 0x2d, 0x73, 0x65, 0x63, 0x75, /* 632: */ 0x72, 0x69, 0x74, 0x79, 0x1b, 0x14, 0x61, 0x63, /* 640: */ 0x63, 0x65, 0x73, 0x73, 0x2d, 0x63, 0x6f, 0x6e, /* 648: */ 0x74, 0x72, 0x6f, 0x6c, 0x2d, 0x61, 0x6c, 0x6c, /* 656: */ 0x6f, 0x77, 0x2d, 0x6f, 0x72, 0x69, 0x67, 0x69, /* 664: */ 0x6e, 0x00, }; /* This points to the first position in table hpack_enc_stream[] of a header * of the same length. */ const signed short hpack_pos_len[32] = { /* 0: */ -1, -1, -1, 0, 10, 46, 67, 99, /* 8: */ 153, -1, 183, 219, 232, 260, 350, 382, /* 16: */ 416, 488, 526, 546, -1, -1, -1, -1, /* 24: */ -1, 609, -1, 636, -1, -1, -1, -1, }; /* Tries to encode header whose name is and value into the chunk . * Returns non-zero on success, 0 on failure (buffer full). */ int hpack_encode_header(struct buffer *out, const struct ist n, const struct ist v) { int len = out->data; int size = out->size; int pos; if (len >= size) return 0; /* look for the header field in the static table */ if (n.len >= sizeof(hpack_pos_len) / sizeof(hpack_pos_len[0])) goto make_literal; pos = hpack_pos_len[n.len]; if (pos >= 0) { /* At least one header field of this length exist */ do { char idx; pos++; idx = hpack_enc_stream[pos++]; pos += n.len; if (isteq(ist2(&hpack_enc_stream[pos - n.len], n.len), n)) { /* emit literal with indexing (7541#6.2.1) : * [ 0 | 1 | Index (6+) ] */ out->area[len++] = idx | 0x40; goto emit_value; } } while ((unsigned char)hpack_enc_stream[pos] == n.len); } make_literal: if (likely(n.len < 127 && len + 2 + n.len <= size)) { out->area[len++] = 0x00; /* literal without indexing -- new name */ out->area[len++] = n.len; /* single-byte length encoding */ ist2bin(out->area + len, n); len += n.len; } else if (hpack_len_to_bytes(n.len) && len + 1 + hpack_len_to_bytes(n.len) + n.len <= size) { out->area[len++] = 0x00; /* literal without indexing -- new name */ len = hpack_encode_len(out->area, len, n.len); ist2bin(out->area + len, n); len += n.len; } else { /* header field name too large for the buffer */ return 0; } emit_value: /* copy literal header field value */ if (!hpack_len_to_bytes(v.len) || len + hpack_len_to_bytes(v.len) + v.len > size) { /* header value too large for the buffer */ return 0; } len = hpack_encode_len(out->area, len, v.len); memcpy(out->area + len, v.ptr, v.len); len += v.len; out->data = len; return 1; }