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/*
*
* 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);
}
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