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 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 37 | #include <grpc/grpc.h> |
| 38 | #include <grpc/support/alloc.h> |
murgatroid99 | 36187ab | 2016-01-06 13:23:59 -0800 | [diff] [blame] | 39 | #include <grpc/support/port_platform.h> |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 40 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 41 | #include "src/core/lib/iomgr/error.h" |
| 42 | #include "src/core/lib/slice/slice_string_helpers.h" |
| 43 | |
| 44 | static grpc_error *conforms_to(grpc_slice slice, const uint8_t *legal_bits, |
| 45 | const char *err_desc) { |
| 46 | const uint8_t *p = GRPC_SLICE_START_PTR(slice); |
| 47 | const uint8_t *e = GRPC_SLICE_END_PTR(slice); |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 48 | for (; p != e; p++) { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 49 | int idx = *p; |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 50 | int byte = idx / 8; |
| 51 | int bit = idx % 8; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 52 | if ((legal_bits[byte] & (1 << bit)) == 0) { |
| 53 | char *dump = grpc_dump_slice(slice, GPR_DUMP_HEX | GPR_DUMP_ASCII); |
| 54 | grpc_error *error = grpc_error_set_str( |
| 55 | grpc_error_set_int(GRPC_ERROR_CREATE(err_desc), GRPC_ERROR_INT_OFFSET, |
| 56 | p - GRPC_SLICE_START_PTR(slice)), |
| 57 | GRPC_ERROR_STR_RAW_BYTES, dump); |
| 58 | gpr_free(dump); |
| 59 | return error; |
| 60 | } |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 61 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 62 | return GRPC_ERROR_NONE; |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 63 | } |
| 64 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 65 | static int error2int(grpc_error *error) { |
| 66 | int r = (error == GRPC_ERROR_NONE); |
| 67 | GRPC_ERROR_UNREF(error); |
| 68 | return r; |
| 69 | } |
| 70 | |
| 71 | grpc_error *grpc_validate_header_key_is_legal(grpc_slice slice) { |
murgatroid99 | d12d5ba | 2016-01-08 13:26:23 -0800 | [diff] [blame] | 72 | static const uint8_t legal_header_bits[256 / 8] = { |
Craig Tiller | 6f87164 | 2016-02-03 16:15:31 -0800 | [diff] [blame] | 73 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0xff, 0x03, 0x00, 0x00, 0x00, |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 74 | 0x80, 0xfe, 0xff, 0xff, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 75 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 76 | if (GRPC_SLICE_LENGTH(slice) == 0) { |
| 77 | return GRPC_ERROR_CREATE("Metadata keys cannot be zero length"); |
Craig Tiller | 296c7bb | 2017-01-10 15:34:02 -0800 | [diff] [blame] | 78 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 79 | if (GRPC_SLICE_START_PTR(slice)[0] == ':') { |
| 80 | return GRPC_ERROR_CREATE("Metadata keys cannot start with :"); |
| 81 | } |
| 82 | return conforms_to(slice, legal_header_bits, "Illegal header key"); |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 83 | } |
| 84 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 85 | int grpc_header_key_is_legal(grpc_slice slice) { |
| 86 | return error2int(grpc_validate_header_key_is_legal(slice)); |
| 87 | } |
| 88 | |
| 89 | grpc_error *grpc_validate_header_nonbin_value_is_legal(grpc_slice slice) { |
murgatroid99 | d12d5ba | 2016-01-08 13:26:23 -0800 | [diff] [blame] | 90 | static const uint8_t legal_header_bits[256 / 8] = { |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 91 | 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 92 | 0xff, 0xff, 0xff, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 93 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 94 | return conforms_to(slice, legal_header_bits, "Illegal header value"); |
Craig Tiller | f2b5b7e | 2017-01-10 08:28:59 -0800 | [diff] [blame] | 95 | } |
| 96 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 97 | int grpc_header_nonbin_value_is_legal(grpc_slice slice) { |
| 98 | return error2int(grpc_validate_header_nonbin_value_is_legal(slice)); |
| 99 | } |
| 100 | |
| 101 | int grpc_is_binary_header(grpc_slice slice) { |
| 102 | if (GRPC_SLICE_LENGTH(slice) < 5) return 0; |
| 103 | return 0 == memcmp(GRPC_SLICE_END_PTR(slice) - 4, "-bin", 4); |
murgatroid99 | c3910ca | 2016-01-06 13:14:23 -0800 | [diff] [blame] | 104 | } |