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/*
*
* 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 <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_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);
}
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