| /* |
| * |
| * 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/lib/http/parser.h" |
| |
| #include <stdbool.h> |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/useful.h> |
| |
| int grpc_http1_trace = 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 grpc_error *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("Expected 'H'"); |
| if (cur == end || *cur++ != 'T') return GRPC_ERROR_CREATE("Expected 'T'"); |
| if (cur == end || *cur++ != 'T') return GRPC_ERROR_CREATE("Expected 'T'"); |
| if (cur == end || *cur++ != 'P') return GRPC_ERROR_CREATE("Expected 'P'"); |
| if (cur == end || *cur++ != '/') return GRPC_ERROR_CREATE("Expected '/'"); |
| if (cur == end || *cur++ != '1') return GRPC_ERROR_CREATE("Expected '1'"); |
| if (cur == end || *cur++ != '.') return GRPC_ERROR_CREATE("Expected '.'"); |
| if (cur == end || *cur < '0' || *cur++ > '1') { |
| return GRPC_ERROR_CREATE("Expected HTTP/1.0 or HTTP/1.1"); |
| } |
| if (cur == end || *cur++ != ' ') return GRPC_ERROR_CREATE("Expected ' '"); |
| if (cur == end || *cur < '1' || *cur++ > '9') |
| return GRPC_ERROR_CREATE("Expected status code"); |
| if (cur == end || *cur < '0' || *cur++ > '9') |
| return GRPC_ERROR_CREATE("Expected status code"); |
| if (cur == end || *cur < '0' || *cur++ > '9') |
| return GRPC_ERROR_CREATE("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("Expected ' '"); |
| |
| /* we don't really care about the status code message */ |
| |
| return GRPC_ERROR_NONE; |
| } |
| |
| static grpc_error *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("No method on HTTP request line"); |
| parser->http.request->method = buf2str(beg, (size_t)(cur - beg - 1)); |
| |
| beg = cur; |
| while (cur != end && *cur++ != ' ') |
| ; |
| if (cur == end) return GRPC_ERROR_CREATE("No path on HTTP request line"); |
| parser->http.request->path = buf2str(beg, (size_t)(cur - beg - 1)); |
| |
| if (cur == end || *cur++ != 'H') return GRPC_ERROR_CREATE("Expected 'H'"); |
| if (cur == end || *cur++ != 'T') return GRPC_ERROR_CREATE("Expected 'T'"); |
| if (cur == end || *cur++ != 'T') return GRPC_ERROR_CREATE("Expected 'T'"); |
| if (cur == end || *cur++ != 'P') return GRPC_ERROR_CREATE("Expected 'P'"); |
| if (cur == end || *cur++ != '/') return GRPC_ERROR_CREATE("Expected '/'"); |
| vers_major = (uint8_t)(*cur++ - '1' + 1); |
| ++cur; |
| if (cur == end) |
| return GRPC_ERROR_CREATE("End of line in HTTP version string"); |
| vers_minor = (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( |
| "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( |
| "Expected one of HTTP/1.0, HTTP/1.1, or HTTP/2.0"); |
| } |
| } else { |
| return GRPC_ERROR_CREATE("Expected one of HTTP/1.0, HTTP/1.1, or HTTP/2.0"); |
| } |
| |
| return GRPC_ERROR_NONE; |
| } |
| |
| static grpc_error *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("Should never reach here")); |
| } |
| |
| static grpc_error *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 = NULL; |
| grpc_http_header **hdrs = NULL; |
| grpc_http_header hdr = {NULL, NULL}; |
| grpc_error *error = GRPC_ERROR_NONE; |
| |
| GPR_ASSERT(cur != end); |
| |
| if (*cur == ' ' || *cur == '\t') { |
| error = GRPC_ERROR_CREATE("Continued header lines not supported yet"); |
| goto done; |
| } |
| |
| while (cur != end && *cur != ':') { |
| cur++; |
| } |
| if (cur == end) { |
| error = GRPC_ERROR_CREATE("Didn't find ':' in header string"); |
| goto done; |
| } |
| GPR_ASSERT(cur >= beg); |
| hdr.key = buf2str(beg, (size_t)(cur - beg)); |
| cur++; /* skip : */ |
| |
| while (cur != end && (*cur == ' ' || *cur == '\t')) { |
| cur++; |
| } |
| GPR_ASSERT((size_t)(end - cur) >= parser->cur_line_end_length); |
| hdr.value = buf2str(cur, (size_t)(end - cur) - parser->cur_line_end_length); |
| |
| switch (parser->type) { |
| case GRPC_HTTP_RESPONSE: |
| hdr_count = &parser->http.response->hdr_count; |
| hdrs = &parser->http.response->hdrs; |
| 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 = |
| GPR_MAX(parser->hdr_capacity + 1, parser->hdr_capacity * 3 / 2); |
| *hdrs = 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 *finish_line(grpc_http_parser *parser, |
| bool *found_body_start) { |
| grpc_error *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: |
| if (parser->cur_line_length == parser->cur_line_end_length) { |
| parser->state = GRPC_HTTP_BODY; |
| *found_body_start = true; |
| break; |
| } |
| err = add_header(parser); |
| if (err != GRPC_ERROR_NONE) { |
| return err; |
| } |
| break; |
| case GRPC_HTTP_BODY: |
| GPR_UNREACHABLE_CODE(return GRPC_ERROR_CREATE("Should never reach here")); |
| } |
| |
| parser->cur_line_length = 0; |
| return GRPC_ERROR_NONE; |
| } |
| |
| static grpc_error *addbyte_body(grpc_http_parser *parser, uint8_t byte) { |
| size_t *body_length = NULL; |
| char **body = NULL; |
| |
| if (parser->type == GRPC_HTTP_RESPONSE) { |
| 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("Should never reach here")); |
| } |
| |
| if (*body_length == parser->body_capacity) { |
| parser->body_capacity = GPR_MAX(8, parser->body_capacity * 3 / 2); |
| *body = gpr_realloc((void *)*body, parser->body_capacity); |
| } |
| (*body)[*body_length] = (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 *addbyte(grpc_http_parser *parser, uint8_t byte, |
| bool *found_body_start) { |
| switch (parser->state) { |
| case GRPC_HTTP_FIRST_LINE: |
| case GRPC_HTTP_HEADERS: |
| if (parser->cur_line_length >= GRPC_HTTP_PARSER_MAX_HEADER_LENGTH) { |
| if (grpc_http1_trace) |
| gpr_log(GPR_ERROR, "HTTP client max line length (%d) exceeded", |
| GRPC_HTTP_PARSER_MAX_HEADER_LENGTH); |
| return GRPC_ERROR_NONE; |
| } |
| 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); |
| } |
| 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 *grpc_http_parser_parse(grpc_http_parser *parser, gpr_slice slice, |
| size_t *start_of_body) { |
| for (size_t i = 0; i < GPR_SLICE_LENGTH(slice); i++) { |
| bool found_body_start = false; |
| grpc_error *err = |
| addbyte(parser, GPR_SLICE_START_PTR(slice)[i], &found_body_start); |
| if (err != GRPC_ERROR_NONE) return err; |
| if (found_body_start && start_of_body != NULL) *start_of_body = i + 1; |
| } |
| return GRPC_ERROR_NONE; |
| } |
| |
| grpc_error *grpc_http_parser_eof(grpc_http_parser *parser) { |
| if (parser->state != GRPC_HTTP_BODY) { |
| return GRPC_ERROR_CREATE("Did not finish headers"); |
| } |
| return GRPC_ERROR_NONE; |
| } |