diff options
Diffstat (limited to 'src/core/lib/channel/message_size_filter.c')
| -rw-r--r-- | src/core/lib/channel/message_size_filter.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/src/core/lib/channel/message_size_filter.c b/src/core/lib/channel/message_size_filter.c new file mode 100644 index 0000000000..02fc68fc3a --- /dev/null +++ b/src/core/lib/channel/message_size_filter.c @@ -0,0 +1,169 @@ +// +// Copyright 2016, 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/channel/message_size_filter.h" + +#include <limits.h> +#include <string.h> + +#include <grpc/support/alloc.h> +#include <grpc/support/log.h> +#include <grpc/support/string_util.h> + +#include "src/core/lib/channel/channel_args.h" + +#define DEFAULT_MAX_SEND_MESSAGE_LENGTH -1 // Unlimited. +// The protobuf library will (by default) start warning at 100 megs. +#define DEFAULT_MAX_RECV_MESSAGE_LENGTH (4 * 1024 * 1024) + +typedef struct call_data { + // Receive closures are chained: we inject this closure as the + // recv_message_ready up-call on transport_stream_op, and remember to + // call our next_recv_message_ready member after handling it. + grpc_closure recv_message_ready; + // Used by recv_message_ready. + grpc_byte_stream** recv_message; + // Original recv_message_ready callback, invoked after our own. + grpc_closure* next_recv_message_ready; +} call_data; + +typedef struct channel_data { + int max_send_size; + int max_recv_size; +} channel_data; + +// Callback invoked when we receive a message. Here we check the max +// receive message size. +static void recv_message_ready(grpc_exec_ctx* exec_ctx, void* user_data, + grpc_error* error) { + grpc_call_element* elem = user_data; + call_data* calld = elem->call_data; + channel_data* chand = elem->channel_data; + if (*calld->recv_message != NULL && chand->max_recv_size >= 0 && + (*calld->recv_message)->length > (size_t)chand->max_recv_size) { + char* message_string; + gpr_asprintf(&message_string, + "Received message larger than max (%u vs. %d)", + (*calld->recv_message)->length, chand->max_recv_size); + gpr_slice message = gpr_slice_from_copied_string(message_string); + gpr_free(message_string); + grpc_call_element_send_close_with_message( + exec_ctx, elem, GRPC_STATUS_INVALID_ARGUMENT, &message); + } + // Invoke the next callback. + grpc_exec_ctx_sched(exec_ctx, calld->next_recv_message_ready, error, NULL); +} + +// Start transport op. +static void start_transport_stream_op(grpc_exec_ctx* exec_ctx, + grpc_call_element* elem, + grpc_transport_stream_op* op) { + call_data* calld = elem->call_data; + channel_data* chand = elem->channel_data; + // Check max send message size. + if (op->send_message != NULL && chand->max_send_size >= 0 && + op->send_message->length > (size_t)chand->max_send_size) { + char* message_string; + gpr_asprintf(&message_string, "Sent message larger than max (%u vs. %d)", + op->send_message->length, chand->max_send_size); + gpr_slice message = gpr_slice_from_copied_string(message_string); + gpr_free(message_string); + grpc_call_element_send_close_with_message( + exec_ctx, elem, GRPC_STATUS_INVALID_ARGUMENT, &message); + } + // Inject callback for receiving a message. + if (op->recv_message_ready != NULL) { + calld->next_recv_message_ready = op->recv_message_ready; + calld->recv_message = op->recv_message; + op->recv_message_ready = &calld->recv_message_ready; + } + // Chain to the next filter. + grpc_call_next_op(exec_ctx, elem, op); +} + +// Constructor for call_data. +static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx, + grpc_call_element* elem, + grpc_call_element_args* args) { + call_data* calld = elem->call_data; + calld->next_recv_message_ready = NULL; + grpc_closure_init(&calld->recv_message_ready, recv_message_ready, elem); + return GRPC_ERROR_NONE; +} + +// Destructor for call_data. +static void destroy_call_elem(grpc_exec_ctx* exec_ctx, grpc_call_element* elem, + const grpc_call_final_info* final_info, + void* ignored) {} + +// Constructor for channel_data. +static void init_channel_elem(grpc_exec_ctx* exec_ctx, + grpc_channel_element* elem, + grpc_channel_element_args* args) { + GPR_ASSERT(!args->is_last); + channel_data* chand = elem->channel_data; + memset(chand, 0, sizeof(*chand)); + chand->max_send_size = DEFAULT_MAX_SEND_MESSAGE_LENGTH; + chand->max_recv_size = DEFAULT_MAX_RECV_MESSAGE_LENGTH; + for (size_t i = 0; i < args->channel_args->num_args; ++i) { + if (strcmp(args->channel_args->args[i].key, + GRPC_ARG_MAX_SEND_MESSAGE_LENGTH) == 0) { + const grpc_integer_options options = {DEFAULT_MAX_SEND_MESSAGE_LENGTH, 0, + INT_MAX}; + chand->max_send_size = + grpc_channel_arg_get_integer(&args->channel_args->args[i], options); + } + if (strcmp(args->channel_args->args[i].key, + GRPC_ARG_MAX_RECEIVE_MESSAGE_LENGTH) == 0) { + const grpc_integer_options options = {DEFAULT_MAX_RECV_MESSAGE_LENGTH, 0, + INT_MAX}; + chand->max_recv_size = + grpc_channel_arg_get_integer(&args->channel_args->args[i], options); + } + } +} + +// Destructor for channel_data. +static void destroy_channel_elem(grpc_exec_ctx* exec_ctx, + grpc_channel_element* elem) {} + +const grpc_channel_filter grpc_message_size_filter = { + start_transport_stream_op, + 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_call_next_get_peer, + "message_size"}; |