| /* |
| * |
| * 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 "src/core/ext/filters/http/server/http_server_filter.h" |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <string.h> |
| #include "src/core/lib/profiling/timers.h" |
| #include "src/core/lib/slice/b64.h" |
| #include "src/core/lib/slice/percent_encoding.h" |
| #include "src/core/lib/slice/slice_internal.h" |
| #include "src/core/lib/slice/slice_string_helpers.h" |
| #include "src/core/lib/transport/static_metadata.h" |
| |
| #define EXPECTED_CONTENT_TYPE "application/grpc" |
| #define EXPECTED_CONTENT_TYPE_LENGTH sizeof(EXPECTED_CONTENT_TYPE) - 1 |
| |
| namespace { |
| struct call_data { |
| grpc_call_combiner* call_combiner; |
| |
| grpc_linked_mdelem status; |
| grpc_linked_mdelem content_type; |
| |
| /* did this request come with path query containing request payload */ |
| bool seen_path_with_query; |
| /* flag to ensure payload_bin is delivered only once */ |
| bool payload_bin_delivered; |
| |
| grpc_metadata_batch* recv_initial_metadata; |
| uint32_t* recv_initial_metadata_flags; |
| /** Closure to call when finished with the hs_on_recv hook */ |
| grpc_closure* on_done_recv; |
| /** Closure to call when we retrieve read message from the path URI |
| */ |
| grpc_closure* recv_message_ready; |
| grpc_closure* on_complete; |
| grpc_byte_stream** pp_recv_message; |
| grpc_slice_buffer read_slice_buffer; |
| grpc_slice_buffer_stream read_stream; |
| |
| /** Receive closures are chained: we inject this closure as the on_done_recv |
| up-call on transport_op, and remember to call our on_done_recv member |
| after handling it. */ |
| grpc_closure hs_on_recv; |
| grpc_closure hs_on_complete; |
| grpc_closure hs_recv_message_ready; |
| }; |
| |
| struct channel_data { |
| uint8_t unused; |
| }; |
| } // namespace |
| |
| static grpc_error* server_filter_outgoing_metadata(grpc_call_element* elem, |
| grpc_metadata_batch* b) { |
| if (b->idx.named.grpc_message != nullptr) { |
| grpc_slice pct_encoded_msg = grpc_percent_encode_slice( |
| GRPC_MDVALUE(b->idx.named.grpc_message->md), |
| grpc_compatible_percent_encoding_unreserved_bytes); |
| if (grpc_slice_is_equivalent(pct_encoded_msg, |
| GRPC_MDVALUE(b->idx.named.grpc_message->md))) { |
| grpc_slice_unref_internal(pct_encoded_msg); |
| } else { |
| grpc_metadata_batch_set_value(b->idx.named.grpc_message, pct_encoded_msg); |
| } |
| } |
| return GRPC_ERROR_NONE; |
| } |
| |
| static void add_error(const char* error_name, grpc_error** cumulative, |
| grpc_error* new_err) { |
| if (new_err == GRPC_ERROR_NONE) return; |
| if (*cumulative == GRPC_ERROR_NONE) { |
| *cumulative = GRPC_ERROR_CREATE_FROM_COPIED_STRING(error_name); |
| } |
| *cumulative = grpc_error_add_child(*cumulative, new_err); |
| } |
| |
| static grpc_error* server_filter_incoming_metadata(grpc_call_element* elem, |
| grpc_metadata_batch* b) { |
| call_data* calld = (call_data*)elem->call_data; |
| grpc_error* error = GRPC_ERROR_NONE; |
| static const char* error_name = "Failed processing incoming headers"; |
| |
| if (b->idx.named.method != nullptr) { |
| if (grpc_mdelem_eq(b->idx.named.method->md, GRPC_MDELEM_METHOD_POST)) { |
| *calld->recv_initial_metadata_flags &= |
| ~(GRPC_INITIAL_METADATA_CACHEABLE_REQUEST | |
| GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST); |
| } else if (grpc_mdelem_eq(b->idx.named.method->md, |
| GRPC_MDELEM_METHOD_PUT)) { |
| *calld->recv_initial_metadata_flags &= |
| ~GRPC_INITIAL_METADATA_CACHEABLE_REQUEST; |
| *calld->recv_initial_metadata_flags |= |
| GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST; |
| } else if (grpc_mdelem_eq(b->idx.named.method->md, |
| GRPC_MDELEM_METHOD_GET)) { |
| *calld->recv_initial_metadata_flags |= |
| GRPC_INITIAL_METADATA_CACHEABLE_REQUEST; |
| *calld->recv_initial_metadata_flags &= |
| ~GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST; |
| } else { |
| add_error(error_name, &error, |
| grpc_attach_md_to_error( |
| GRPC_ERROR_CREATE_FROM_STATIC_STRING("Bad header"), |
| b->idx.named.method->md)); |
| } |
| grpc_metadata_batch_remove(b, b->idx.named.method); |
| } else { |
| add_error( |
| error_name, &error, |
| grpc_error_set_str( |
| GRPC_ERROR_CREATE_FROM_STATIC_STRING("Missing header"), |
| GRPC_ERROR_STR_KEY, grpc_slice_from_static_string(":method"))); |
| } |
| |
| if (b->idx.named.te != nullptr) { |
| if (!grpc_mdelem_eq(b->idx.named.te->md, GRPC_MDELEM_TE_TRAILERS)) { |
| add_error(error_name, &error, |
| grpc_attach_md_to_error( |
| GRPC_ERROR_CREATE_FROM_STATIC_STRING("Bad header"), |
| b->idx.named.te->md)); |
| } |
| grpc_metadata_batch_remove(b, b->idx.named.te); |
| } else { |
| add_error(error_name, &error, |
| grpc_error_set_str( |
| GRPC_ERROR_CREATE_FROM_STATIC_STRING("Missing header"), |
| GRPC_ERROR_STR_KEY, grpc_slice_from_static_string("te"))); |
| } |
| |
| if (b->idx.named.scheme != nullptr) { |
| if (!grpc_mdelem_eq(b->idx.named.scheme->md, GRPC_MDELEM_SCHEME_HTTP) && |
| !grpc_mdelem_eq(b->idx.named.scheme->md, GRPC_MDELEM_SCHEME_HTTPS) && |
| !grpc_mdelem_eq(b->idx.named.scheme->md, GRPC_MDELEM_SCHEME_GRPC)) { |
| add_error(error_name, &error, |
| grpc_attach_md_to_error( |
| GRPC_ERROR_CREATE_FROM_STATIC_STRING("Bad header"), |
| b->idx.named.scheme->md)); |
| } |
| grpc_metadata_batch_remove(b, b->idx.named.scheme); |
| } else { |
| add_error( |
| error_name, &error, |
| grpc_error_set_str( |
| GRPC_ERROR_CREATE_FROM_STATIC_STRING("Missing header"), |
| GRPC_ERROR_STR_KEY, grpc_slice_from_static_string(":scheme"))); |
| } |
| |
| if (b->idx.named.content_type != nullptr) { |
| if (!grpc_mdelem_eq(b->idx.named.content_type->md, |
| GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC)) { |
| if (grpc_slice_buf_start_eq(GRPC_MDVALUE(b->idx.named.content_type->md), |
| EXPECTED_CONTENT_TYPE, |
| EXPECTED_CONTENT_TYPE_LENGTH) && |
| (GRPC_SLICE_START_PTR(GRPC_MDVALUE( |
| b->idx.named.content_type->md))[EXPECTED_CONTENT_TYPE_LENGTH] == |
| '+' || |
| GRPC_SLICE_START_PTR(GRPC_MDVALUE( |
| b->idx.named.content_type->md))[EXPECTED_CONTENT_TYPE_LENGTH] == |
| ';')) { |
| /* Although the C implementation doesn't (currently) generate them, |
| any custom +-suffix is explicitly valid. */ |
| /* TODO(klempner): We should consider preallocating common values such |
| as +proto or +json, or at least stashing them if we see them. */ |
| /* TODO(klempner): Should we be surfacing this to application code? */ |
| } else { |
| /* TODO(klempner): We're currently allowing this, but we shouldn't |
| see it without a proxy so log for now. */ |
| char* val = grpc_dump_slice(GRPC_MDVALUE(b->idx.named.content_type->md), |
| GPR_DUMP_ASCII); |
| gpr_log(GPR_INFO, "Unexpected content-type '%s'", val); |
| gpr_free(val); |
| } |
| } |
| grpc_metadata_batch_remove(b, b->idx.named.content_type); |
| } |
| |
| if (b->idx.named.path == nullptr) { |
| add_error(error_name, &error, |
| grpc_error_set_str( |
| GRPC_ERROR_CREATE_FROM_STATIC_STRING("Missing header"), |
| GRPC_ERROR_STR_KEY, grpc_slice_from_static_string(":path"))); |
| } else if (*calld->recv_initial_metadata_flags & |
| GRPC_INITIAL_METADATA_CACHEABLE_REQUEST) { |
| /* We have a cacheable request made with GET verb. The path contains the |
| * query parameter which is base64 encoded request payload. */ |
| const char k_query_separator = '?'; |
| grpc_slice path_slice = GRPC_MDVALUE(b->idx.named.path->md); |
| uint8_t* path_ptr = (uint8_t*)GRPC_SLICE_START_PTR(path_slice); |
| size_t path_length = GRPC_SLICE_LENGTH(path_slice); |
| /* offset of the character '?' */ |
| size_t offset = 0; |
| for (offset = 0; offset < path_length && *path_ptr != k_query_separator; |
| path_ptr++, offset++) |
| ; |
| if (offset < path_length) { |
| grpc_slice query_slice = |
| grpc_slice_sub(path_slice, offset + 1, path_length); |
| |
| /* substitute path metadata with just the path (not query) */ |
| grpc_mdelem mdelem_path_without_query = grpc_mdelem_from_slices( |
| GRPC_MDSTR_PATH, grpc_slice_sub(path_slice, 0, offset)); |
| |
| grpc_metadata_batch_substitute(b, b->idx.named.path, |
| mdelem_path_without_query); |
| |
| /* decode payload from query and add to the slice buffer to be returned */ |
| const int k_url_safe = 1; |
| grpc_slice_buffer_add(&calld->read_slice_buffer, |
| grpc_base64_decode_with_len( |
| (const char*)GRPC_SLICE_START_PTR(query_slice), |
| GRPC_SLICE_LENGTH(query_slice), k_url_safe)); |
| grpc_slice_buffer_stream_init(&calld->read_stream, |
| &calld->read_slice_buffer, 0); |
| calld->seen_path_with_query = true; |
| grpc_slice_unref_internal(query_slice); |
| } else { |
| gpr_log(GPR_ERROR, "GET request without QUERY"); |
| } |
| } |
| |
| if (b->idx.named.host != nullptr && b->idx.named.authority == nullptr) { |
| grpc_linked_mdelem* el = b->idx.named.host; |
| grpc_mdelem md = GRPC_MDELEM_REF(el->md); |
| grpc_metadata_batch_remove(b, el); |
| add_error(error_name, &error, |
| grpc_metadata_batch_add_head( |
| b, el, |
| grpc_mdelem_from_slices( |
| GRPC_MDSTR_AUTHORITY, |
| grpc_slice_ref_internal(GRPC_MDVALUE(md))))); |
| GRPC_MDELEM_UNREF(md); |
| } |
| |
| if (b->idx.named.authority == nullptr) { |
| add_error( |
| error_name, &error, |
| grpc_error_set_str( |
| GRPC_ERROR_CREATE_FROM_STATIC_STRING("Missing header"), |
| GRPC_ERROR_STR_KEY, grpc_slice_from_static_string(":authority"))); |
| } |
| |
| return error; |
| } |
| |
| static void hs_on_recv(void* user_data, grpc_error* err) { |
| grpc_call_element* elem = (grpc_call_element*)user_data; |
| call_data* calld = (call_data*)elem->call_data; |
| if (err == GRPC_ERROR_NONE) { |
| err = server_filter_incoming_metadata(elem, calld->recv_initial_metadata); |
| } else { |
| GRPC_ERROR_REF(err); |
| } |
| GRPC_CLOSURE_RUN(calld->on_done_recv, err); |
| } |
| |
| static void hs_on_complete(void* user_data, grpc_error* err) { |
| grpc_call_element* elem = (grpc_call_element*)user_data; |
| call_data* calld = (call_data*)elem->call_data; |
| /* Call recv_message_ready if we got the payload via the path field */ |
| if (calld->seen_path_with_query && calld->recv_message_ready != nullptr) { |
| *calld->pp_recv_message = calld->payload_bin_delivered |
| ? nullptr |
| : (grpc_byte_stream*)&calld->read_stream; |
| // Re-enter call combiner for recv_message_ready, since the surface |
| // code will release the call combiner for each callback it receives. |
| GRPC_CALL_COMBINER_START(calld->call_combiner, calld->recv_message_ready, |
| GRPC_ERROR_REF(err), |
| "resuming recv_message_ready from on_complete"); |
| calld->recv_message_ready = nullptr; |
| calld->payload_bin_delivered = true; |
| } |
| GRPC_CLOSURE_RUN(calld->on_complete, GRPC_ERROR_REF(err)); |
| } |
| |
| static void hs_recv_message_ready(void* user_data, grpc_error* err) { |
| grpc_call_element* elem = (grpc_call_element*)user_data; |
| call_data* calld = (call_data*)elem->call_data; |
| if (calld->seen_path_with_query) { |
| // Do nothing. This is probably a GET request, and payload will be |
| // returned in hs_on_complete callback. |
| // Note that we release the call combiner here, so that other |
| // callbacks can run. |
| GRPC_CALL_COMBINER_STOP(calld->call_combiner, |
| "pausing recv_message_ready until on_complete"); |
| } else { |
| GRPC_CLOSURE_RUN(calld->recv_message_ready, GRPC_ERROR_REF(err)); |
| } |
| } |
| |
| static grpc_error* hs_mutate_op(grpc_call_element* elem, |
| grpc_transport_stream_op_batch* op) { |
| /* grab pointers to our data from the call element */ |
| call_data* calld = (call_data*)elem->call_data; |
| |
| if (op->send_initial_metadata) { |
| grpc_error* error = GRPC_ERROR_NONE; |
| static const char* error_name = "Failed sending initial metadata"; |
| add_error(error_name, &error, |
| grpc_metadata_batch_add_head( |
| op->payload->send_initial_metadata.send_initial_metadata, |
| &calld->status, GRPC_MDELEM_STATUS_200)); |
| add_error(error_name, &error, |
| grpc_metadata_batch_add_tail( |
| op->payload->send_initial_metadata.send_initial_metadata, |
| &calld->content_type, |
| GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC)); |
| add_error( |
| error_name, &error, |
| server_filter_outgoing_metadata( |
| elem, op->payload->send_initial_metadata.send_initial_metadata)); |
| if (error != GRPC_ERROR_NONE) return error; |
| } |
| |
| if (op->recv_initial_metadata) { |
| /* substitute our callback for the higher callback */ |
| GPR_ASSERT(op->payload->recv_initial_metadata.recv_flags != nullptr); |
| calld->recv_initial_metadata = |
| op->payload->recv_initial_metadata.recv_initial_metadata; |
| calld->recv_initial_metadata_flags = |
| op->payload->recv_initial_metadata.recv_flags; |
| calld->on_done_recv = |
| op->payload->recv_initial_metadata.recv_initial_metadata_ready; |
| op->payload->recv_initial_metadata.recv_initial_metadata_ready = |
| &calld->hs_on_recv; |
| } |
| |
| if (op->recv_message) { |
| calld->recv_message_ready = op->payload->recv_message.recv_message_ready; |
| calld->pp_recv_message = op->payload->recv_message.recv_message; |
| if (op->payload->recv_message.recv_message_ready) { |
| op->payload->recv_message.recv_message_ready = |
| &calld->hs_recv_message_ready; |
| } |
| if (op->on_complete) { |
| calld->on_complete = op->on_complete; |
| op->on_complete = &calld->hs_on_complete; |
| } |
| } |
| |
| if (op->send_trailing_metadata) { |
| grpc_error* error = server_filter_outgoing_metadata( |
| elem, op->payload->send_trailing_metadata.send_trailing_metadata); |
| if (error != GRPC_ERROR_NONE) return error; |
| } |
| |
| return GRPC_ERROR_NONE; |
| } |
| |
| static void hs_start_transport_stream_op_batch( |
| grpc_call_element* elem, grpc_transport_stream_op_batch* op) { |
| GPR_TIMER_SCOPE("hs_start_transport_stream_op_batch", 0); |
| call_data* calld = (call_data*)elem->call_data; |
| grpc_error* error = hs_mutate_op(elem, op); |
| if (error != GRPC_ERROR_NONE) { |
| grpc_transport_stream_op_batch_finish_with_failure(op, error, |
| calld->call_combiner); |
| } else { |
| grpc_call_next_op(elem, op); |
| } |
| } |
| |
| /* Constructor for call_data */ |
| static grpc_error* init_call_elem(grpc_call_element* elem, |
| const grpc_call_element_args* args) { |
| /* grab pointers to our data from the call element */ |
| call_data* calld = (call_data*)elem->call_data; |
| /* initialize members */ |
| calld->call_combiner = args->call_combiner; |
| GRPC_CLOSURE_INIT(&calld->hs_on_recv, hs_on_recv, elem, |
| grpc_schedule_on_exec_ctx); |
| GRPC_CLOSURE_INIT(&calld->hs_on_complete, hs_on_complete, elem, |
| grpc_schedule_on_exec_ctx); |
| GRPC_CLOSURE_INIT(&calld->hs_recv_message_ready, hs_recv_message_ready, elem, |
| grpc_schedule_on_exec_ctx); |
| grpc_slice_buffer_init(&calld->read_slice_buffer); |
| return GRPC_ERROR_NONE; |
| } |
| |
| /* Destructor for call_data */ |
| static void destroy_call_elem(grpc_call_element* elem, |
| const grpc_call_final_info* final_info, |
| grpc_closure* ignored) { |
| call_data* calld = (call_data*)elem->call_data; |
| grpc_slice_buffer_destroy_internal(&calld->read_slice_buffer); |
| } |
| |
| /* Constructor for channel_data */ |
| static grpc_error* init_channel_elem(grpc_channel_element* elem, |
| grpc_channel_element_args* args) { |
| GPR_ASSERT(!args->is_last); |
| return GRPC_ERROR_NONE; |
| } |
| |
| /* Destructor for channel data */ |
| static void destroy_channel_elem(grpc_channel_element* elem) {} |
| |
| const grpc_channel_filter grpc_http_server_filter = { |
| hs_start_transport_stream_op_batch, |
| grpc_channel_next_op, |
| sizeof(call_data), |
| init_call_elem, |
| grpc_call_stack_ignore_set_pollset_or_pollset_set, |
| destroy_call_elem, |
| sizeof(channel_data), |
| init_channel_elem, |
| destroy_channel_elem, |
| grpc_channel_next_get_info, |
| "http-server"}; |