murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright 2016, Google Inc. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions are |
| 8 | * met: |
| 9 | * |
| 10 | * * Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * * Redistributions in binary form must reproduce the above |
| 13 | * copyright notice, this list of conditions and the following disclaimer |
| 14 | * in the documentation and/or other materials provided with the |
| 15 | * distribution. |
| 16 | * * Neither the name of Google Inc. nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | */ |
| 33 | |
| 34 | #include <stdlib.h> |
| 35 | #include <string.h> |
| 36 | |
murgatroid99 | 36187ab | 2016-01-06 13:23:59 -0800 | [diff] [blame] | 37 | #include <grpc/support/port_platform.h> |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 38 | |
murgatroid99 | d12d5ba | 2016-01-08 13:26:23 -0800 | [diff] [blame] | 39 | static int conforms_to(const char *s, size_t len, const uint8_t *legal_bits) { |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 40 | const char *p = s; |
| 41 | const char *e = s + len; |
| 42 | for (; p != e; p++) { |
Craig Tiller | bdc2410 | 2016-04-21 23:57:05 -0700 | [diff] [blame] | 43 | int idx = (uint8_t)*p; |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 44 | int byte = idx / 8; |
| 45 | int bit = idx % 8; |
| 46 | if ((legal_bits[byte] & (1 << bit)) == 0) return 0; |
| 47 | } |
| 48 | return 1; |
| 49 | } |
| 50 | |
| 51 | int grpc_header_key_is_legal(const char *key, size_t length) { |
murgatroid99 | d12d5ba | 2016-01-08 13:26:23 -0800 | [diff] [blame] | 52 | static const uint8_t legal_header_bits[256 / 8] = { |
Craig Tiller | 6f87164 | 2016-02-03 16:15:31 -0800 | [diff] [blame] | 53 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0xff, 0x03, 0x00, 0x00, 0x00, |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 54 | 0x80, 0xfe, 0xff, 0xff, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 55 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; |
murgatroid99 | 58bb40f | 2016-01-07 10:14:02 -0800 | [diff] [blame] | 56 | if (length == 0) { |
| 57 | return 0; |
| 58 | } |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 59 | return conforms_to(key, length, legal_header_bits); |
| 60 | } |
| 61 | |
| 62 | int grpc_header_nonbin_value_is_legal(const char *value, size_t length) { |
murgatroid99 | d12d5ba | 2016-01-08 13:26:23 -0800 | [diff] [blame] | 63 | static const uint8_t legal_header_bits[256 / 8] = { |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 64 | 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 65 | 0xff, 0xff, 0xff, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 66 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; |
| 67 | return conforms_to(value, length, legal_header_bits); |
| 68 | } |
| 69 | |
| 70 | int grpc_is_binary_header(const char *key, size_t length) { |
| 71 | if (length < 5) return 0; |
| 72 | return 0 == memcmp(key + length - 4, "-bin", 4); |
| 73 | } |