1 /* 2 * 3 * Copyright 2016 gRPC authors. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 19 #include <grpc/support/port_platform.h> 20 21 #include <stdlib.h> 22 #include <string.h> 23 24 #include <grpc/grpc.h> 25 #include <grpc/support/alloc.h> 26 27 #include "src/core/lib/iomgr/error.h" 28 #include "src/core/lib/slice/slice_internal.h" 29 #include "src/core/lib/slice/slice_string_helpers.h" 30 #include "src/core/lib/surface/validate_metadata.h" 31 32 static grpc_error* conforms_to(grpc_slice slice, const uint8_t* legal_bits, 33 const char* err_desc) { 34 const uint8_t* p = GRPC_SLICE_START_PTR(slice); 35 const uint8_t* e = GRPC_SLICE_END_PTR(slice); 36 for (; p != e; p++) { 37 int idx = *p; 38 int byte = idx / 8; 39 int bit = idx % 8; 40 if ((legal_bits[byte] & (1 << bit)) == 0) { 41 char* dump = grpc_dump_slice(slice, GPR_DUMP_HEX | GPR_DUMP_ASCII); 42 grpc_error* error = grpc_error_set_str( 43 grpc_error_set_int(GRPC_ERROR_CREATE_FROM_COPIED_STRING(err_desc), 44 GRPC_ERROR_INT_OFFSET, 45 p - GRPC_SLICE_START_PTR(slice)), 46 GRPC_ERROR_STR_RAW_BYTES, grpc_slice_from_copied_string(dump)); 47 gpr_free(dump); 48 return error; 49 } 50 } 51 return GRPC_ERROR_NONE; 52 } 53 54 static int error2int(grpc_error* error) { 55 int r = (error == GRPC_ERROR_NONE); 56 GRPC_ERROR_UNREF(error); 57 return r; 58 } 59 60 grpc_error* grpc_validate_header_key_is_legal(grpc_slice slice) { 61 static const uint8_t legal_header_bits[256 / 8] = { 62 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0xff, 0x03, 0x00, 0x00, 0x00, 63 0x80, 0xfe, 0xff, 0xff, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 64 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; 65 if (GRPC_SLICE_LENGTH(slice) == 0) { 66 return GRPC_ERROR_CREATE_FROM_STATIC_STRING( 67 "Metadata keys cannot be zero length"); 68 } 69 if (GRPC_SLICE_START_PTR(slice)[0] == ':') { 70 return GRPC_ERROR_CREATE_FROM_STATIC_STRING( 71 "Metadata keys cannot start with :"); 72 } 73 return conforms_to(slice, legal_header_bits, "Illegal header key"); 74 } 75 76 int grpc_header_key_is_legal(grpc_slice slice) { 77 return error2int(grpc_validate_header_key_is_legal(slice)); 78 } 79 80 grpc_error* grpc_validate_header_nonbin_value_is_legal(grpc_slice slice) { 81 static const uint8_t legal_header_bits[256 / 8] = { 82 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 83 0xff, 0xff, 0xff, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 84 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; 85 return conforms_to(slice, legal_header_bits, "Illegal header value"); 86 } 87 88 int grpc_header_nonbin_value_is_legal(grpc_slice slice) { 89 return error2int(grpc_validate_header_nonbin_value_is_legal(slice)); 90 } 91 92 int grpc_is_binary_header(grpc_slice slice) { 93 if (GRPC_SLICE_LENGTH(slice) < 5) return 0; 94 return 0 == memcmp(GRPC_SLICE_END_PTR(slice) - 4, "-bin", 4); 95 } 96
