| /* |
| * |
| * Copyright 2016 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #include <grpc/support/port_platform.h> |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <grpc/grpc.h> |
| #include <grpc/support/alloc.h> |
| |
| #include "src/core/lib/iomgr/error.h" |
| #include "src/core/lib/slice/slice_internal.h" |
| #include "src/core/lib/slice/slice_string_helpers.h" |
| #include "src/core/lib/surface/validate_metadata.h" |
| |
| static grpc_error* conforms_to(grpc_slice slice, const uint8_t* legal_bits, |
| const char* err_desc) { |
| const uint8_t* p = GRPC_SLICE_START_PTR(slice); |
| const uint8_t* e = GRPC_SLICE_END_PTR(slice); |
| for (; p != e; p++) { |
| int idx = *p; |
| int byte = idx / 8; |
| int bit = idx % 8; |
| if ((legal_bits[byte] & (1 << bit)) == 0) { |
| char* dump = grpc_dump_slice(slice, GPR_DUMP_HEX | GPR_DUMP_ASCII); |
| grpc_error* error = grpc_error_set_str( |
| grpc_error_set_int(GRPC_ERROR_CREATE_FROM_COPIED_STRING(err_desc), |
| GRPC_ERROR_INT_OFFSET, |
| p - GRPC_SLICE_START_PTR(slice)), |
| GRPC_ERROR_STR_RAW_BYTES, grpc_slice_from_copied_string(dump)); |
| gpr_free(dump); |
| return error; |
| } |
| } |
| return GRPC_ERROR_NONE; |
| } |
| |
| static int error2int(grpc_error* error) { |
| int r = (error == GRPC_ERROR_NONE); |
| GRPC_ERROR_UNREF(error); |
| return r; |
| } |
| |
| grpc_error* grpc_validate_header_key_is_legal(grpc_slice slice) { |
| static const uint8_t legal_header_bits[256 / 8] = { |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0xff, 0x03, 0x00, 0x00, 0x00, |
| 0x80, 0xfe, 0xff, 0xff, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; |
| if (GRPC_SLICE_LENGTH(slice) == 0) { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "Metadata keys cannot be zero length"); |
| } |
| if (GRPC_SLICE_START_PTR(slice)[0] == ':') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "Metadata keys cannot start with :"); |
| } |
| return conforms_to(slice, legal_header_bits, "Illegal header key"); |
| } |
| |
| int grpc_header_key_is_legal(grpc_slice slice) { |
| return error2int(grpc_validate_header_key_is_legal(slice)); |
| } |
| |
| grpc_error* grpc_validate_header_nonbin_value_is_legal(grpc_slice slice) { |
| static const uint8_t legal_header_bits[256 / 8] = { |
| 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; |
| return conforms_to(slice, legal_header_bits, "Illegal header value"); |
| } |
| |
| int grpc_header_nonbin_value_is_legal(grpc_slice slice) { |
| return error2int(grpc_validate_header_nonbin_value_is_legal(slice)); |
| } |
| |
| int grpc_is_binary_header(grpc_slice slice) { |
| if (GRPC_SLICE_LENGTH(slice) < 5) return 0; |
| return 0 == memcmp(GRPC_SLICE_END_PTR(slice) - 4, "-bin", 4); |
| } |