| /* |
| * |
| * 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/transport/chttp2/frame_data.h" |
| |
| #include <string.h> |
| |
| #include "src/core/transport/chttp2/internal.h" |
| #include "src/core/support/string.h" |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/useful.h> |
| #include "src/core/transport/transport.h" |
| |
| grpc_chttp2_parse_error grpc_chttp2_data_parser_init( |
| grpc_chttp2_data_parser *parser) { |
| parser->state = GRPC_CHTTP2_DATA_FH_0; |
| parser->parsing_frame = NULL; |
| return GRPC_CHTTP2_PARSE_OK; |
| } |
| |
| void grpc_chttp2_data_parser_destroy(grpc_exec_ctx *exec_ctx, |
| grpc_chttp2_data_parser *parser) { |
| grpc_byte_stream *bs; |
| if (parser->parsing_frame) { |
| grpc_chttp2_incoming_byte_stream_finished(exec_ctx, parser->parsing_frame, |
| 0, 1); |
| } |
| while ( |
| (bs = grpc_chttp2_incoming_frame_queue_pop(&parser->incoming_frames))) { |
| grpc_byte_stream_destroy(exec_ctx, bs); |
| } |
| } |
| |
| grpc_chttp2_parse_error grpc_chttp2_data_parser_begin_frame( |
| grpc_chttp2_data_parser *parser, uint8_t flags) { |
| if (flags & ~GRPC_CHTTP2_DATA_FLAG_END_STREAM) { |
| gpr_log(GPR_ERROR, "unsupported data flags: 0x%02x", flags); |
| return GRPC_CHTTP2_STREAM_ERROR; |
| } |
| |
| if (flags & GRPC_CHTTP2_DATA_FLAG_END_STREAM) { |
| parser->is_last_frame = 1; |
| } else { |
| parser->is_last_frame = 0; |
| } |
| |
| return GRPC_CHTTP2_PARSE_OK; |
| } |
| |
| void grpc_chttp2_incoming_frame_queue_merge( |
| grpc_chttp2_incoming_frame_queue *head_dst, |
| grpc_chttp2_incoming_frame_queue *tail_src) { |
| if (tail_src->head == NULL) { |
| return; |
| } |
| |
| if (head_dst->head == NULL) { |
| *head_dst = *tail_src; |
| memset(tail_src, 0, sizeof(*tail_src)); |
| return; |
| } |
| |
| head_dst->tail->next_message = tail_src->head; |
| head_dst->tail = tail_src->tail; |
| memset(tail_src, 0, sizeof(*tail_src)); |
| } |
| |
| grpc_byte_stream *grpc_chttp2_incoming_frame_queue_pop( |
| grpc_chttp2_incoming_frame_queue *q) { |
| grpc_byte_stream *out; |
| if (q->head == NULL) { |
| return NULL; |
| } |
| out = &q->head->base; |
| if (q->head == q->tail) { |
| memset(q, 0, sizeof(*q)); |
| } else { |
| q->head = q->head->next_message; |
| } |
| return out; |
| } |
| |
| void grpc_chttp2_encode_data(uint32_t id, gpr_slice_buffer *inbuf, |
| uint32_t write_bytes, int is_eof, |
| gpr_slice_buffer *outbuf) { |
| gpr_slice hdr; |
| uint8_t *p; |
| |
| hdr = gpr_slice_malloc(9); |
| p = GPR_SLICE_START_PTR(hdr); |
| GPR_ASSERT(write_bytes < (1 << 24)); |
| *p++ = (uint8_t)(write_bytes >> 16); |
| *p++ = (uint8_t)(write_bytes >> 8); |
| *p++ = (uint8_t)(write_bytes); |
| *p++ = GRPC_CHTTP2_FRAME_DATA; |
| *p++ = is_eof ? GRPC_CHTTP2_DATA_FLAG_END_STREAM : 0; |
| *p++ = (uint8_t)(id >> 24); |
| *p++ = (uint8_t)(id >> 16); |
| *p++ = (uint8_t)(id >> 8); |
| *p++ = (uint8_t)(id); |
| gpr_slice_buffer_add(outbuf, hdr); |
| |
| gpr_slice_buffer_move_first(inbuf, write_bytes, outbuf); |
| } |
| |
| grpc_chttp2_parse_error grpc_chttp2_data_parser_parse( |
| grpc_exec_ctx *exec_ctx, void *parser, |
| grpc_chttp2_transport_parsing *transport_parsing, |
| grpc_chttp2_stream_parsing *stream_parsing, gpr_slice slice, int is_last) { |
| uint8_t *const beg = GPR_SLICE_START_PTR(slice); |
| uint8_t *const end = GPR_SLICE_END_PTR(slice); |
| uint8_t *cur = beg; |
| grpc_chttp2_data_parser *p = parser; |
| uint32_t message_flags; |
| grpc_chttp2_incoming_byte_stream *incoming_byte_stream; |
| |
| if (is_last && p->is_last_frame) { |
| stream_parsing->received_close = 1; |
| } |
| |
| if (cur == end) { |
| return GRPC_CHTTP2_PARSE_OK; |
| } |
| |
| switch (p->state) { |
| fh_0: |
| case GRPC_CHTTP2_DATA_FH_0: |
| p->frame_type = *cur; |
| switch (p->frame_type) { |
| case 0: |
| p->is_frame_compressed = 0; /* GPR_FALSE */ |
| break; |
| case 1: |
| p->is_frame_compressed = 1; /* GPR_TRUE */ |
| break; |
| default: |
| gpr_log(GPR_ERROR, "Bad GRPC frame type 0x%02x", p->frame_type); |
| return GRPC_CHTTP2_STREAM_ERROR; |
| } |
| if (++cur == end) { |
| p->state = GRPC_CHTTP2_DATA_FH_1; |
| return GRPC_CHTTP2_PARSE_OK; |
| } |
| /* fallthrough */ |
| case GRPC_CHTTP2_DATA_FH_1: |
| p->frame_size = ((uint32_t)*cur) << 24; |
| if (++cur == end) { |
| p->state = GRPC_CHTTP2_DATA_FH_2; |
| return GRPC_CHTTP2_PARSE_OK; |
| } |
| /* fallthrough */ |
| case GRPC_CHTTP2_DATA_FH_2: |
| p->frame_size |= ((uint32_t)*cur) << 16; |
| if (++cur == end) { |
| p->state = GRPC_CHTTP2_DATA_FH_3; |
| return GRPC_CHTTP2_PARSE_OK; |
| } |
| /* fallthrough */ |
| case GRPC_CHTTP2_DATA_FH_3: |
| p->frame_size |= ((uint32_t)*cur) << 8; |
| if (++cur == end) { |
| p->state = GRPC_CHTTP2_DATA_FH_4; |
| return GRPC_CHTTP2_PARSE_OK; |
| } |
| /* fallthrough */ |
| case GRPC_CHTTP2_DATA_FH_4: |
| p->frame_size |= ((uint32_t)*cur); |
| p->state = GRPC_CHTTP2_DATA_FRAME; |
| ++cur; |
| message_flags = 0; |
| if (p->is_frame_compressed) { |
| message_flags |= GRPC_WRITE_INTERNAL_COMPRESS; |
| } |
| p->parsing_frame = incoming_byte_stream = |
| grpc_chttp2_incoming_byte_stream_create( |
| exec_ctx, transport_parsing, stream_parsing, p->frame_size, |
| message_flags, &p->incoming_frames); |
| /* fallthrough */ |
| case GRPC_CHTTP2_DATA_FRAME: |
| if (cur == end) { |
| grpc_chttp2_list_add_parsing_seen_stream(transport_parsing, |
| stream_parsing); |
| return GRPC_CHTTP2_PARSE_OK; |
| } |
| grpc_chttp2_list_add_parsing_seen_stream(transport_parsing, |
| stream_parsing); |
| if ((uint32_t)(end - cur) == p->frame_size) { |
| grpc_chttp2_incoming_byte_stream_push( |
| exec_ctx, p->parsing_frame, |
| gpr_slice_sub(slice, (size_t)(cur - beg), (size_t)(end - beg))); |
| grpc_chttp2_incoming_byte_stream_finished(exec_ctx, p->parsing_frame, 1, |
| 1); |
| p->parsing_frame = NULL; |
| p->state = GRPC_CHTTP2_DATA_FH_0; |
| return GRPC_CHTTP2_PARSE_OK; |
| } else if ((uint32_t)(end - cur) > p->frame_size) { |
| grpc_chttp2_incoming_byte_stream_push( |
| exec_ctx, p->parsing_frame, |
| gpr_slice_sub(slice, (size_t)(cur - beg), |
| (size_t)(cur + p->frame_size - beg))); |
| grpc_chttp2_incoming_byte_stream_finished(exec_ctx, p->parsing_frame, 1, |
| 1); |
| p->parsing_frame = NULL; |
| cur += p->frame_size; |
| goto fh_0; /* loop */ |
| } else { |
| grpc_chttp2_incoming_byte_stream_push( |
| exec_ctx, p->parsing_frame, |
| gpr_slice_sub(slice, (size_t)(cur - beg), (size_t)(end - beg))); |
| GPR_ASSERT((size_t)(end - cur) <= p->frame_size); |
| p->frame_size -= (uint32_t)(end - cur); |
| return GRPC_CHTTP2_PARSE_OK; |
| } |
| } |
| |
| GPR_UNREACHABLE_CODE(return GRPC_CHTTP2_CONNECTION_ERROR); |
| } |