| /* |
| * |
| * Copyright 2016, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <grpc/grpc.h> |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/port_platform.h> |
| |
| #include "src/core/lib/iomgr/error.h" |
| #include "src/core/lib/slice/slice_string_helpers.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(err_desc), GRPC_ERROR_INT_OFFSET, |
| p - GRPC_SLICE_START_PTR(slice)), |
| GRPC_ERROR_STR_RAW_BYTES, 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("Metadata keys cannot be zero length"); |
| } |
| if (GRPC_SLICE_START_PTR(slice)[0] == ':') { |
| return GRPC_ERROR_CREATE("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); |
| } |