| /* |
| * |
| * Copyright 2015 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 <grpc/support/port_platform.h> |
| |
| #include "src/core/lib/http/parser.h" |
| |
| #include <stdbool.h> |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| |
| #include "src/core/lib/gpr/useful.h" |
| |
| grpc_core::TraceFlag grpc_http1_trace(false, "http1"); |
| |
| static char* buf2str(void* buffer, size_t length) { |
| char* out = static_cast<char*>(gpr_malloc(length + 1)); |
| memcpy(out, buffer, length); |
| out[length] = 0; |
| return out; |
| } |
| |
| static grpc_error_handle handle_response_line(grpc_http_parser* parser) { |
| uint8_t* beg = parser->cur_line; |
| uint8_t* cur = beg; |
| uint8_t* end = beg + parser->cur_line_length; |
| |
| if (cur == end || *cur++ != 'H') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected 'H'"); |
| } |
| if (cur == end || *cur++ != 'T') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected 'T'"); |
| } |
| if (cur == end || *cur++ != 'T') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected 'T'"); |
| } |
| if (cur == end || *cur++ != 'P') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected 'P'"); |
| } |
| if (cur == end || *cur++ != '/') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected '/'"); |
| } |
| if (cur == end || *cur++ != '1') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected '1'"); |
| } |
| if (cur == end || *cur++ != '.') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected '.'"); |
| } |
| if (cur == end || *cur < '0' || *cur++ > '1') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "Expected HTTP/1.0 or HTTP/1.1"); |
| } |
| if (cur == end || *cur++ != ' ') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected ' '"); |
| } |
| if (cur == end || *cur < '1' || *cur++ > '9') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected status code"); |
| } |
| if (cur == end || *cur < '0' || *cur++ > '9') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected status code"); |
| } |
| if (cur == end || *cur < '0' || *cur++ > '9') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected status code"); |
| } |
| parser->http.response->status = |
| (cur[-3] - '0') * 100 + (cur[-2] - '0') * 10 + (cur[-1] - '0'); |
| if (cur == end || *cur++ != ' ') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected ' '"); |
| } |
| |
| /* we don't really care about the status code message */ |
| |
| return GRPC_ERROR_NONE; |
| } |
| |
| static grpc_error_handle handle_request_line(grpc_http_parser* parser) { |
| uint8_t* beg = parser->cur_line; |
| uint8_t* cur = beg; |
| uint8_t* end = beg + parser->cur_line_length; |
| uint8_t vers_major = 0; |
| uint8_t vers_minor = 0; |
| |
| while (cur != end && *cur++ != ' ') { |
| } |
| if (cur == end) { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "No method on HTTP request line"); |
| } |
| parser->http.request->method = |
| buf2str(beg, static_cast<size_t>(cur - beg - 1)); |
| |
| beg = cur; |
| while (cur != end && *cur++ != ' ') { |
| } |
| if (cur == end) { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("No path on HTTP request line"); |
| } |
| parser->http.request->path = buf2str(beg, static_cast<size_t>(cur - beg - 1)); |
| |
| if (cur == end || *cur++ != 'H') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected 'H'"); |
| } |
| if (cur == end || *cur++ != 'T') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected 'T'"); |
| } |
| if (cur == end || *cur++ != 'T') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected 'T'"); |
| } |
| if (cur == end || *cur++ != 'P') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected 'P'"); |
| } |
| if (cur == end || *cur++ != '/') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Expected '/'"); |
| } |
| vers_major = static_cast<uint8_t>(*cur++ - '1' + 1); |
| ++cur; |
| if (cur == end) { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "End of line in HTTP version string"); |
| } |
| vers_minor = static_cast<uint8_t>(*cur++ - '1' + 1); |
| |
| if (vers_major == 1) { |
| if (vers_minor == 0) { |
| parser->http.request->version = GRPC_HTTP_HTTP10; |
| } else if (vers_minor == 1) { |
| parser->http.request->version = GRPC_HTTP_HTTP11; |
| } else { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "Expected one of HTTP/1.0, HTTP/1.1, or HTTP/2.0"); |
| } |
| } else if (vers_major == 2) { |
| if (vers_minor == 0) { |
| parser->http.request->version = GRPC_HTTP_HTTP20; |
| } else { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "Expected one of HTTP/1.0, HTTP/1.1, or HTTP/2.0"); |
| } |
| } else { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "Expected one of HTTP/1.0, HTTP/1.1, or HTTP/2.0"); |
| } |
| |
| return GRPC_ERROR_NONE; |
| } |
| |
| static grpc_error_handle handle_first_line(grpc_http_parser* parser) { |
| switch (parser->type) { |
| case GRPC_HTTP_REQUEST: |
| return handle_request_line(parser); |
| case GRPC_HTTP_RESPONSE: |
| return handle_response_line(parser); |
| } |
| GPR_UNREACHABLE_CODE( |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Should never reach here")); |
| } |
| |
| static grpc_error_handle add_header(grpc_http_parser* parser) { |
| uint8_t* beg = parser->cur_line; |
| uint8_t* cur = beg; |
| uint8_t* end = beg + parser->cur_line_length; |
| size_t* hdr_count = nullptr; |
| size_t size = 0; |
| grpc_http_header** hdrs = nullptr; |
| grpc_http_header hdr = {nullptr, nullptr}; |
| grpc_error_handle error = GRPC_ERROR_NONE; |
| |
| GPR_ASSERT(cur != end); |
| |
| if (*cur == ' ' || *cur == '\t') { |
| error = GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "Continued header lines not supported yet"); |
| goto done; |
| } |
| |
| while (cur != end && *cur != ':') { |
| cur++; |
| } |
| if (cur == end) { |
| error = GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "Didn't find ':' in header string"); |
| goto done; |
| } |
| GPR_ASSERT(cur >= beg); |
| hdr.key = buf2str(beg, static_cast<size_t>(cur - beg)); |
| cur++; /* skip : */ |
| |
| while (cur != end && (*cur == ' ' || *cur == '\t')) { |
| cur++; |
| } |
| GPR_ASSERT((size_t)(end - cur) >= parser->cur_line_end_length); |
| size = static_cast<size_t>(end - cur) - parser->cur_line_end_length; |
| if ((size != 0) && (cur[size - 1] == '\r')) { |
| size--; |
| } |
| hdr.value = buf2str(cur, size); |
| |
| switch (parser->type) { |
| case GRPC_HTTP_RESPONSE: |
| hdr_count = &parser->http.response->hdr_count; |
| hdrs = &parser->http.response->hdrs; |
| if ((strcmp(hdr.key, "Transfer-Encoding") == 0) && |
| (strcmp(hdr.value, "chunked") == 0)) { |
| parser->http.response->chunked_state = GRPC_HTTP_CHUNKED_LENGTH; |
| } |
| break; |
| case GRPC_HTTP_REQUEST: |
| hdr_count = &parser->http.request->hdr_count; |
| hdrs = &parser->http.request->hdrs; |
| break; |
| } |
| |
| if (*hdr_count == parser->hdr_capacity) { |
| parser->hdr_capacity = |
| std::max(parser->hdr_capacity + 1, parser->hdr_capacity * 3 / 2); |
| *hdrs = static_cast<grpc_http_header*>( |
| gpr_realloc(*hdrs, parser->hdr_capacity * sizeof(**hdrs))); |
| } |
| (*hdrs)[(*hdr_count)++] = hdr; |
| |
| done: |
| if (error != GRPC_ERROR_NONE) { |
| gpr_free(hdr.key); |
| gpr_free(hdr.value); |
| } |
| return error; |
| } |
| |
| static grpc_error_handle finish_line(grpc_http_parser* parser, |
| bool* found_body_start) { |
| grpc_error_handle err; |
| switch (parser->state) { |
| case GRPC_HTTP_FIRST_LINE: |
| err = handle_first_line(parser); |
| if (err != GRPC_ERROR_NONE) return err; |
| parser->state = GRPC_HTTP_HEADERS; |
| break; |
| case GRPC_HTTP_HEADERS: |
| case GRPC_HTTP_TRAILERS: |
| if (parser->cur_line_length == parser->cur_line_end_length) { |
| if (parser->state == GRPC_HTTP_HEADERS) { |
| parser->state = GRPC_HTTP_BODY; |
| *found_body_start = true; |
| } else { |
| parser->state = GRPC_HTTP_END; |
| } |
| break; |
| } else { |
| err = add_header(parser); |
| if (err != GRPC_ERROR_NONE) { |
| return err; |
| } |
| } |
| break; |
| case GRPC_HTTP_BODY: |
| case GRPC_HTTP_END: |
| GPR_UNREACHABLE_CODE(return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "Should never reach here")); |
| } |
| |
| parser->cur_line_length = 0; |
| return GRPC_ERROR_NONE; |
| } |
| |
| static grpc_error_handle addbyte_body(grpc_http_parser* parser, uint8_t byte) { |
| size_t* body_length = nullptr; |
| char** body = nullptr; |
| |
| if (parser->type == GRPC_HTTP_RESPONSE) { |
| switch (parser->http.response->chunked_state) { |
| case GRPC_HTTP_CHUNKED_LENGTH: |
| if ((byte == '\r') || (byte == ';')) { |
| parser->http.response->chunked_state = |
| GRPC_HTTP_CHUNKED_IGNORE_ALL_UNTIL_LF; |
| } else if ((byte >= '0') && (byte <= '9')) { |
| parser->http.response->chunk_length *= 16; |
| parser->http.response->chunk_length += byte - '0'; |
| } else if ((byte >= 'a') && (byte <= 'f')) { |
| parser->http.response->chunk_length *= 16; |
| parser->http.response->chunk_length += byte - 'a' + 10; |
| } else if ((byte >= 'A') && (byte <= 'F')) { |
| parser->http.response->chunk_length *= 16; |
| parser->http.response->chunk_length += byte - 'A' + 10; |
| } else { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "Expected chunk size in hexadecimal"); |
| } |
| return GRPC_ERROR_NONE; |
| case GRPC_HTTP_CHUNKED_IGNORE_ALL_UNTIL_LF: |
| if (byte == '\n') { |
| if (parser->http.response->chunk_length == 0) { |
| parser->state = GRPC_HTTP_TRAILERS; |
| } else { |
| parser->http.response->chunked_state = GRPC_HTTP_CHUNKED_BODY; |
| } |
| } |
| return GRPC_ERROR_NONE; |
| case GRPC_HTTP_CHUNKED_BODY: |
| if (parser->http.response->chunk_length == 0) { |
| if (byte != '\r') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "Expected '\\r\\n' after chunk body"); |
| } |
| parser->http.response->chunked_state = GRPC_HTTP_CHUNKED_CONSUME_LF; |
| parser->http.response->chunk_length = 0; |
| return GRPC_ERROR_NONE; |
| } else { |
| parser->http.response->chunk_length--; |
| /* fallback to the normal body appending code below */ |
| } |
| break; |
| case GRPC_HTTP_CHUNKED_CONSUME_LF: |
| if (byte != '\n') { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "Expected '\\r\\n' after chunk body"); |
| } |
| parser->http.response->chunked_state = GRPC_HTTP_CHUNKED_LENGTH; |
| return GRPC_ERROR_NONE; |
| case GRPC_HTTP_CHUNKED_PLAIN: |
| /* avoiding warning; just fallback to normal codepath */ |
| break; |
| } |
| body_length = &parser->http.response->body_length; |
| body = &parser->http.response->body; |
| } else if (parser->type == GRPC_HTTP_REQUEST) { |
| body_length = &parser->http.request->body_length; |
| body = &parser->http.request->body; |
| } else { |
| GPR_UNREACHABLE_CODE( |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Should never reach here")); |
| } |
| |
| if (*body_length == parser->body_capacity) { |
| parser->body_capacity = std::max(size_t(8), parser->body_capacity * 3 / 2); |
| *body = static_cast<char*>(gpr_realloc(*body, parser->body_capacity)); |
| } |
| (*body)[*body_length] = static_cast<char>(byte); |
| (*body_length)++; |
| |
| return GRPC_ERROR_NONE; |
| } |
| |
| static bool check_line(grpc_http_parser* parser) { |
| 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 true; |
| } |
| |
| // HTTP request with \n\r line termiantors. |
| else if (parser->cur_line_length >= 2 && |
| parser->cur_line[parser->cur_line_length - 2] == '\n' && |
| parser->cur_line[parser->cur_line_length - 1] == '\r') { |
| return true; |
| } |
| |
| // HTTP request with only \n line terminators. |
| else if (parser->cur_line_length >= 1 && |
| parser->cur_line[parser->cur_line_length - 1] == '\n') { |
| parser->cur_line_end_length = 1; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static grpc_error_handle addbyte(grpc_http_parser* parser, uint8_t byte, |
| bool* found_body_start) { |
| switch (parser->state) { |
| case GRPC_HTTP_FIRST_LINE: |
| case GRPC_HTTP_HEADERS: |
| case GRPC_HTTP_TRAILERS: |
| if (parser->cur_line_length >= GRPC_HTTP_PARSER_MAX_HEADER_LENGTH) { |
| if (GRPC_TRACE_FLAG_ENABLED(grpc_http1_trace)) { |
| gpr_log(GPR_ERROR, "HTTP header max line length (%d) exceeded", |
| GRPC_HTTP_PARSER_MAX_HEADER_LENGTH); |
| } |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "HTTP header max line length exceeded"); |
| } |
| parser->cur_line[parser->cur_line_length] = byte; |
| parser->cur_line_length++; |
| if (check_line(parser)) { |
| return finish_line(parser, found_body_start); |
| } |
| return GRPC_ERROR_NONE; |
| case GRPC_HTTP_BODY: |
| return addbyte_body(parser, byte); |
| case GRPC_HTTP_END: |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Unexpected byte after end"); |
| } |
| GPR_UNREACHABLE_CODE(return GRPC_ERROR_NONE); |
| } |
| |
| void grpc_http_parser_init(grpc_http_parser* parser, grpc_http_type type, |
| void* request_or_response) { |
| memset(parser, 0, sizeof(*parser)); |
| parser->state = GRPC_HTTP_FIRST_LINE; |
| parser->type = type; |
| parser->http.request_or_response = request_or_response; |
| parser->cur_line_end_length = 2; |
| } |
| |
| void grpc_http_parser_destroy(grpc_http_parser* /*parser*/) {} |
| |
| void grpc_http_request_destroy(grpc_http_request* request) { |
| size_t i; |
| gpr_free(request->body); |
| for (i = 0; i < request->hdr_count; i++) { |
| gpr_free(request->hdrs[i].key); |
| gpr_free(request->hdrs[i].value); |
| } |
| gpr_free(request->hdrs); |
| gpr_free(request->method); |
| gpr_free(request->path); |
| } |
| |
| void grpc_http_response_destroy(grpc_http_response* response) { |
| size_t i; |
| gpr_free(response->body); |
| for (i = 0; i < response->hdr_count; i++) { |
| gpr_free(response->hdrs[i].key); |
| gpr_free(response->hdrs[i].value); |
| } |
| gpr_free(response->hdrs); |
| } |
| |
| grpc_error_handle grpc_http_parser_parse(grpc_http_parser* parser, |
| const grpc_slice& slice, |
| size_t* start_of_body) { |
| for (size_t i = 0; i < GRPC_SLICE_LENGTH(slice); i++) { |
| bool found_body_start = false; |
| grpc_error_handle err = |
| addbyte(parser, GRPC_SLICE_START_PTR(slice)[i], &found_body_start); |
| if (err != GRPC_ERROR_NONE) return err; |
| if (found_body_start && start_of_body != nullptr) *start_of_body = i + 1; |
| } |
| return GRPC_ERROR_NONE; |
| } |
| |
| grpc_error_handle grpc_http_parser_eof(grpc_http_parser* parser) { |
| if ((parser->state != GRPC_HTTP_BODY) && (parser->state != GRPC_HTTP_END)) { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Did not finish headers"); |
| } |
| return GRPC_ERROR_NONE; |
| } |