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/*
*
* Copyright 2015, 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 "src/core/httpcli/parser.h"
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/useful.h>
static int handle_response_line(grpc_httpcli_parser *parser) {
gpr_uint8 *beg = parser->cur_line;
gpr_uint8 *cur = beg;
gpr_uint8 *end = beg + parser->cur_line_length;
if (cur == end || *cur++ != 'H') goto error;
if (cur == end || *cur++ != 'T') goto error;
if (cur == end || *cur++ != 'T') goto error;
if (cur == end || *cur++ != 'P') goto error;
if (cur == end || *cur++ != '/') goto error;
if (cur == end || *cur++ != '1') goto error;
if (cur == end || *cur++ != '.') goto error;
if (cur == end || *cur < '0' || *cur++ > '1') goto error;
if (cur == end || *cur++ != ' ') goto error;
if (cur == end || *cur < '1' || *cur++ > '9') goto error;
if (cur == end || *cur < '0' || *cur++ > '9') goto error;
if (cur == end || *cur < '0' || *cur++ > '9') goto error;
parser->r.status =
(cur[-3] - '0') * 100 + (cur[-2] - '0') * 10 + (cur[-1] - '0');
if (cur == end || *cur++ != ' ') goto error;
/* we don't really care about the status code message */
return 1;
error:
gpr_log(GPR_ERROR, "Failed parsing response line");
return 0;
}
static char *buf2str(void *buffer, size_t length) {
char *out = gpr_malloc(length + 1);
memcpy(out, buffer, length);
out[length] = 0;
return out;
}
static int add_header(grpc_httpcli_parser *parser) {
gpr_uint8 *beg = parser->cur_line;
gpr_uint8 *cur = beg;
gpr_uint8 *end = beg + parser->cur_line_length;
grpc_httpcli_header hdr = {NULL, NULL};
GPR_ASSERT(cur != end);
if (*cur == ' ' || *cur == '\t') {
gpr_log(GPR_ERROR, "Continued header lines not supported yet");
goto error;
}
while (cur != end && *cur != ':') {
cur++;
}
if (cur == end) {
gpr_log(GPR_ERROR, "Didn't find ':' in header string");
goto error;
}
GPR_ASSERT(cur >= beg);
hdr.key = buf2str(beg, (size_t)(cur - beg));
cur++; /* skip : */
while (cur != end && (*cur == ' ' || *cur == '\t')) {
cur++;
}
GPR_ASSERT(end - cur >= 2);
hdr.value = buf2str(cur, (size_t)(end - cur) - 2);
if (parser->r.hdr_count == parser->hdr_capacity) {
parser->hdr_capacity =
GPR_MAX(parser->hdr_capacity + 1, parser->hdr_capacity * 3 / 2);
parser->r.hdrs = gpr_realloc(
parser->r.hdrs, parser->hdr_capacity * sizeof(*parser->r.hdrs));
}
parser->r.hdrs[parser->r.hdr_count++] = hdr;
return 1;
error:
gpr_free(hdr.key);
gpr_free(hdr.value);
return 0;
}
static int finish_line(grpc_httpcli_parser *parser) {
switch (parser->state) {
case GRPC_HTTPCLI_INITIAL_RESPONSE:
if (!handle_response_line(parser)) {
return 0;
}
parser->state = GRPC_HTTPCLI_HEADERS;
break;
case GRPC_HTTPCLI_HEADERS:
if (parser->cur_line_length == 2) {
parser->state = GRPC_HTTPCLI_BODY;
break;
}
if (!add_header(parser)) {
return 0;
}
break;
case GRPC_HTTPCLI_BODY:
GPR_UNREACHABLE_CODE(return 0);
}
parser->cur_line_length = 0;
return 1;
}
static int addbyte(grpc_httpcli_parser *parser, gpr_uint8 byte) {
switch (parser->state) {
case GRPC_HTTPCLI_INITIAL_RESPONSE:
case GRPC_HTTPCLI_HEADERS:
if (parser->cur_line_length >= GRPC_HTTPCLI_MAX_HEADER_LENGTH) {
gpr_log(GPR_ERROR, "HTTP client max line length (%d) exceeded",
GRPC_HTTPCLI_MAX_HEADER_LENGTH);
return 0;
}
parser->cur_line[parser->cur_line_length] = byte;
parser->cur_line_length++;
if (parser->cur_line_length >= 2 &&
parser->cur_line[parser->cur_line_length - 2] == '\r' &&
parser->cur_line[parser->cur_line_length - 1] == '\n') {
return finish_line(parser);
} else {
return 1;
}
GPR_UNREACHABLE_CODE(return 0);
case GRPC_HTTPCLI_BODY:
if (parser->r.body_length == parser->body_capacity) {
parser->body_capacity = GPR_MAX(8, parser->body_capacity * 3 / 2);
parser->r.body =
gpr_realloc((void *)parser->r.body, parser->body_capacity);
}
parser->r.body[parser->r.body_length] = (char)byte;
parser->r.body_length++;
return 1;
}
GPR_UNREACHABLE_CODE(return 0);
}
void grpc_httpcli_parser_init(grpc_httpcli_parser *parser) {
memset(parser, 0, sizeof(*parser));
parser->state = GRPC_HTTPCLI_INITIAL_RESPONSE;
parser->r.status = 500;
}
void grpc_httpcli_parser_destroy(grpc_httpcli_parser *parser) {
size_t i;
gpr_free(parser->r.body);
for (i = 0; i < parser->r.hdr_count; i++) {
gpr_free(parser->r.hdrs[i].key);
gpr_free(parser->r.hdrs[i].value);
}
gpr_free(parser->r.hdrs);
}
int grpc_httpcli_parser_parse(grpc_httpcli_parser *parser, gpr_slice slice) {
size_t i;
for (i = 0; i < GPR_SLICE_LENGTH(slice); i++) {
if (!addbyte(parser, GPR_SLICE_START_PTR(slice)[i])) {
return 0;
}
}
return 1;
}
int grpc_httpcli_parser_eof(grpc_httpcli_parser *parser) {
return parser->state == GRPC_HTTPCLI_BODY;
}
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