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/*
*
* 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 "test/core/end2end/fixtures/http_proxy.h"
#include "src/core/lib/iomgr/sockaddr.h"
#include <string.h>
#include <grpc/slice_buffer.h>
#include <grpc/support/alloc.h>
#include <grpc/support/atm.h>
#include <grpc/support/host_port.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include <grpc/support/sync.h>
#include <grpc/support/thd.h>
#include <grpc/support/useful.h>
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/http/parser.h"
#include "src/core/lib/iomgr/closure.h"
#include "src/core/lib/iomgr/endpoint.h"
#include "src/core/lib/iomgr/error.h"
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/core/lib/iomgr/pollset.h"
#include "src/core/lib/iomgr/pollset_set.h"
#include "src/core/lib/iomgr/resolve_address.h"
#include "src/core/lib/iomgr/sockaddr_utils.h"
#include "src/core/lib/iomgr/tcp_client.h"
#include "src/core/lib/iomgr/tcp_server.h"
#include "test/core/util/port.h"
struct grpc_end2end_http_proxy {
char* proxy_name;
gpr_thd_id thd;
grpc_tcp_server* server;
grpc_channel_args* channel_args;
gpr_mu* mu;
grpc_pollset* pollset;
gpr_atm shutdown;
};
//
// Connection handling
//
typedef struct proxy_connection {
grpc_endpoint* client_endpoint;
grpc_endpoint* server_endpoint;
gpr_refcount refcount;
grpc_pollset_set* pollset_set;
grpc_closure on_read_request_done;
grpc_closure on_server_connect_done;
grpc_closure on_write_response_done;
grpc_closure on_client_read_done;
grpc_closure on_client_write_done;
grpc_closure on_server_read_done;
grpc_closure on_server_write_done;
grpc_slice_buffer client_read_buffer;
grpc_slice_buffer client_deferred_write_buffer;
grpc_slice_buffer client_write_buffer;
grpc_slice_buffer server_read_buffer;
grpc_slice_buffer server_deferred_write_buffer;
grpc_slice_buffer server_write_buffer;
grpc_http_parser http_parser;
grpc_http_request http_request;
} proxy_connection;
// Helper function to destroy the proxy connection.
static void proxy_connection_unref(grpc_exec_ctx* exec_ctx,
proxy_connection* conn) {
if (gpr_unref(&conn->refcount)) {
grpc_endpoint_destroy(exec_ctx, conn->client_endpoint);
if (conn->server_endpoint != NULL)
grpc_endpoint_destroy(exec_ctx, conn->server_endpoint);
grpc_pollset_set_destroy(conn->pollset_set);
grpc_slice_buffer_destroy(&conn->client_read_buffer);
grpc_slice_buffer_destroy(&conn->client_deferred_write_buffer);
grpc_slice_buffer_destroy(&conn->client_write_buffer);
grpc_slice_buffer_destroy(&conn->server_read_buffer);
grpc_slice_buffer_destroy(&conn->server_deferred_write_buffer);
grpc_slice_buffer_destroy(&conn->server_write_buffer);
grpc_http_parser_destroy(&conn->http_parser);
grpc_http_request_destroy(&conn->http_request);
gpr_free(conn);
}
}
// Helper function to shut down the proxy connection.
// Does NOT take ownership of a reference to error.
static void proxy_connection_failed(grpc_exec_ctx* exec_ctx,
proxy_connection* conn, bool is_client,
const char* prefix, grpc_error* error) {
const char* msg = grpc_error_string(error);
gpr_log(GPR_INFO, "%s: %s", prefix, msg);
grpc_error_free_string(msg);
grpc_endpoint_shutdown(exec_ctx, conn->client_endpoint);
if (conn->server_endpoint != NULL)
grpc_endpoint_shutdown(exec_ctx, conn->server_endpoint);
proxy_connection_unref(exec_ctx, conn);
}
// Callback for writing proxy data to the client.
static void on_client_write_done(grpc_exec_ctx* exec_ctx, void* arg,
grpc_error* error) {
proxy_connection* conn = arg;
if (error != GRPC_ERROR_NONE) {
proxy_connection_failed(exec_ctx, conn, true /* is_client */,
"HTTP proxy client write", error);
return;
}
// Clear write buffer (the data we just wrote).
grpc_slice_buffer_reset_and_unref(&conn->client_write_buffer);
// If more data was read from the server since we started this write,
// write that data now.
if (conn->client_deferred_write_buffer.length > 0) {
grpc_slice_buffer_move_into(&conn->client_deferred_write_buffer,
&conn->client_write_buffer);
grpc_endpoint_write(exec_ctx, conn->client_endpoint,
&conn->client_write_buffer,
&conn->on_client_write_done);
} else {
// No more writes. Unref the connection.
proxy_connection_unref(exec_ctx, conn);
}
}
// Callback for writing proxy data to the backend server.
static void on_server_write_done(grpc_exec_ctx* exec_ctx, void* arg,
grpc_error* error) {
proxy_connection* conn = arg;
if (error != GRPC_ERROR_NONE) {
proxy_connection_failed(exec_ctx, conn, false /* is_client */,
"HTTP proxy server write", error);
return;
}
// Clear write buffer (the data we just wrote).
grpc_slice_buffer_reset_and_unref(&conn->server_write_buffer);
// If more data was read from the client since we started this write,
// write that data now.
if (conn->server_deferred_write_buffer.length > 0) {
grpc_slice_buffer_move_into(&conn->server_deferred_write_buffer,
&conn->server_write_buffer);
grpc_endpoint_write(exec_ctx, conn->server_endpoint,
&conn->server_write_buffer,
&conn->on_server_write_done);
} else {
// No more writes. Unref the connection.
proxy_connection_unref(exec_ctx, conn);
}
}
// Callback for reading data from the client, which will be proxied to
// the backend server.
static void on_client_read_done(grpc_exec_ctx* exec_ctx, void* arg,
grpc_error* error) {
proxy_connection* conn = arg;
if (error != GRPC_ERROR_NONE) {
proxy_connection_failed(exec_ctx, conn, true /* is_client */,
"HTTP proxy client read", error);
return;
}
// If there is already a pending write (i.e., server_write_buffer is
// not empty), then move the read data into server_deferred_write_buffer,
// and the next write will be requested in on_server_write_done(), when
// the current write is finished.
//
// Otherwise, move the read data into the write buffer and write it.
if (conn->server_write_buffer.length > 0) {
grpc_slice_buffer_move_into(&conn->client_read_buffer,
&conn->server_deferred_write_buffer);
} else {
grpc_slice_buffer_move_into(&conn->client_read_buffer,
&conn->server_write_buffer);
gpr_ref(&conn->refcount);
grpc_endpoint_write(exec_ctx, conn->server_endpoint,
&conn->server_write_buffer,
&conn->on_server_write_done);
}
// Read more data.
grpc_endpoint_read(exec_ctx, conn->client_endpoint, &conn->client_read_buffer,
&conn->on_client_read_done);
}
// Callback for reading data from the backend server, which will be
// proxied to the client.
static void on_server_read_done(grpc_exec_ctx* exec_ctx, void* arg,
grpc_error* error) {
proxy_connection* conn = arg;
if (error != GRPC_ERROR_NONE) {
proxy_connection_failed(exec_ctx, conn, false /* is_client */,
"HTTP proxy server read", error);
return;
}
// If there is already a pending write (i.e., client_write_buffer is
// not empty), then move the read data into client_deferred_write_buffer,
// and the next write will be requested in on_client_write_done(), when
// the current write is finished.
//
// Otherwise, move the read data into the write buffer and write it.
if (conn->client_write_buffer.length > 0) {
grpc_slice_buffer_move_into(&conn->server_read_buffer,
&conn->client_deferred_write_buffer);
} else {
grpc_slice_buffer_move_into(&conn->server_read_buffer,
&conn->client_write_buffer);
gpr_ref(&conn->refcount);
grpc_endpoint_write(exec_ctx, conn->client_endpoint,
&conn->client_write_buffer,
&conn->on_client_write_done);
}
// Read more data.
grpc_endpoint_read(exec_ctx, conn->server_endpoint, &conn->server_read_buffer,
&conn->on_server_read_done);
}
// Callback to write the HTTP response for the CONNECT request.
static void on_write_response_done(grpc_exec_ctx* exec_ctx, void* arg,
grpc_error* error) {
proxy_connection* conn = arg;
if (error != GRPC_ERROR_NONE) {
proxy_connection_failed(exec_ctx, conn, true /* is_client */,
"HTTP proxy write response", error);
return;
}
// Clear write buffer.
grpc_slice_buffer_reset_and_unref(&conn->client_write_buffer);
// Start reading from both client and server. One of the read
// requests inherits our ref to conn, but we need to take a new ref
// for the other one.
gpr_ref(&conn->refcount);
grpc_endpoint_read(exec_ctx, conn->client_endpoint, &conn->client_read_buffer,
&conn->on_client_read_done);
grpc_endpoint_read(exec_ctx, conn->server_endpoint, &conn->server_read_buffer,
&conn->on_server_read_done);
}
// Callback to connect to the backend server specified by the HTTP
// CONNECT request.
static void on_server_connect_done(grpc_exec_ctx* exec_ctx, void* arg,
grpc_error* error) {
proxy_connection* conn = arg;
if (error != GRPC_ERROR_NONE) {
// TODO(roth): Technically, in this case, we should handle the error
// by returning an HTTP response to the client indicating that the
// connection failed. However, for the purposes of this test code,
// it's fine to pretend this is a client-side error, which will
// cause the client connection to be dropped.
proxy_connection_failed(exec_ctx, conn, true /* is_client */,
"HTTP proxy server connect", error);
return;
}
// We've established a connection, so send back a 200 response code to
// the client.
// The write callback inherits our reference to conn.
grpc_slice slice =
grpc_slice_from_copied_string("HTTP/1.0 200 connected\r\n\r\n");
grpc_slice_buffer_add(&conn->client_write_buffer, slice);
grpc_endpoint_write(exec_ctx, conn->client_endpoint,
&conn->client_write_buffer,
&conn->on_write_response_done);
}
// Callback to read the HTTP CONNECT request.
// TODO(roth): Technically, for any of the failure modes handled by this
// function, we should handle the error by returning an HTTP response to
// the client indicating that the request failed. However, for the purposes
// of this test code, it's fine to pretend this is a client-side error,
// which will cause the client connection to be dropped.
static void on_read_request_done(grpc_exec_ctx* exec_ctx, void* arg,
grpc_error* error) {
proxy_connection* conn = arg;
if (error != GRPC_ERROR_NONE) {
proxy_connection_failed(exec_ctx, conn, true /* is_client */,
"HTTP proxy read request", error);
return;
}
// Read request and feed it to the parser.
for (size_t i = 0; i < conn->client_read_buffer.count; ++i) {
if (GRPC_SLICE_LENGTH(conn->client_read_buffer.slices[i]) > 0) {
error = grpc_http_parser_parse(&conn->http_parser,
conn->client_read_buffer.slices[i], NULL);
if (error != GRPC_ERROR_NONE) {
proxy_connection_failed(exec_ctx, conn, true /* is_client */,
"HTTP proxy request parse", error);
GRPC_ERROR_UNREF(error);
return;
}
}
}
grpc_slice_buffer_reset_and_unref(&conn->client_read_buffer);
// If we're not done reading the request, read more data.
if (conn->http_parser.state != GRPC_HTTP_BODY) {
grpc_endpoint_read(exec_ctx, conn->client_endpoint,
&conn->client_read_buffer, &conn->on_read_request_done);
return;
}
// Make sure we got a CONNECT request.
if (strcmp(conn->http_request.method, "CONNECT") != 0) {
char* msg;
gpr_asprintf(&msg, "HTTP proxy got request method %s",
conn->http_request.method);
error = GRPC_ERROR_CREATE(msg);
gpr_free(msg);
proxy_connection_failed(exec_ctx, conn, true /* is_client */,
"HTTP proxy read request", error);
GRPC_ERROR_UNREF(error);
return;
}
// Resolve address.
grpc_resolved_addresses* resolved_addresses = NULL;
error = grpc_blocking_resolve_address(conn->http_request.path, "80",
&resolved_addresses);
if (error != GRPC_ERROR_NONE) {
proxy_connection_failed(exec_ctx, conn, true /* is_client */,
"HTTP proxy DNS lookup", error);
GRPC_ERROR_UNREF(error);
return;
}
GPR_ASSERT(resolved_addresses->naddrs >= 1);
// Connect to requested address.
// The connection callback inherits our reference to conn.
const gpr_timespec deadline = gpr_time_add(
gpr_now(GPR_CLOCK_MONOTONIC), gpr_time_from_seconds(10, GPR_TIMESPAN));
grpc_tcp_client_connect(exec_ctx, &conn->on_server_connect_done,
&conn->server_endpoint, conn->pollset_set, NULL,
&resolved_addresses->addrs[0], deadline);
grpc_resolved_addresses_destroy(resolved_addresses);
}
static void on_accept(grpc_exec_ctx* exec_ctx, void* arg,
grpc_endpoint* endpoint, grpc_pollset* accepting_pollset,
grpc_tcp_server_acceptor* acceptor) {
grpc_end2end_http_proxy* proxy = arg;
// Instantiate proxy_connection.
proxy_connection* conn = gpr_malloc(sizeof(*conn));
memset(conn, 0, sizeof(*conn));
conn->client_endpoint = endpoint;
gpr_ref_init(&conn->refcount, 1);
conn->pollset_set = grpc_pollset_set_create();
grpc_pollset_set_add_pollset(exec_ctx, conn->pollset_set, proxy->pollset);
grpc_closure_init(&conn->on_read_request_done, on_read_request_done, conn);
grpc_closure_init(&conn->on_server_connect_done, on_server_connect_done,
conn);
grpc_closure_init(&conn->on_write_response_done, on_write_response_done,
conn);
grpc_closure_init(&conn->on_client_read_done, on_client_read_done, conn);
grpc_closure_init(&conn->on_client_write_done, on_client_write_done, conn);
grpc_closure_init(&conn->on_server_read_done, on_server_read_done, conn);
grpc_closure_init(&conn->on_server_write_done, on_server_write_done, conn);
grpc_slice_buffer_init(&conn->client_read_buffer);
grpc_slice_buffer_init(&conn->client_deferred_write_buffer);
grpc_slice_buffer_init(&conn->client_write_buffer);
grpc_slice_buffer_init(&conn->server_read_buffer);
grpc_slice_buffer_init(&conn->server_deferred_write_buffer);
grpc_slice_buffer_init(&conn->server_write_buffer);
grpc_http_parser_init(&conn->http_parser, GRPC_HTTP_REQUEST,
&conn->http_request);
grpc_endpoint_read(exec_ctx, conn->client_endpoint, &conn->client_read_buffer,
&conn->on_read_request_done);
}
//
// Proxy class
//
static void thread_main(void* arg) {
grpc_end2end_http_proxy* proxy = arg;
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
do {
const gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC);
const gpr_timespec deadline =
gpr_time_add(now, gpr_time_from_seconds(1, GPR_TIMESPAN));
grpc_pollset_worker* worker = NULL;
gpr_mu_lock(proxy->mu);
GRPC_LOG_IF_ERROR(
"grpc_pollset_work",
grpc_pollset_work(&exec_ctx, proxy->pollset, &worker, now, deadline));
gpr_mu_unlock(proxy->mu);
grpc_exec_ctx_flush(&exec_ctx);
} while (!gpr_atm_acq_load(&proxy->shutdown));
grpc_exec_ctx_finish(&exec_ctx);
}
grpc_end2end_http_proxy* grpc_end2end_http_proxy_create(void) {
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
grpc_end2end_http_proxy* proxy = gpr_malloc(sizeof(*proxy));
memset(proxy, 0, sizeof(*proxy));
// Construct proxy address.
const int proxy_port = grpc_pick_unused_port_or_die();
gpr_join_host_port(&proxy->proxy_name, "localhost", proxy_port);
gpr_log(GPR_INFO, "Proxy address: %s", proxy->proxy_name);
// Create TCP server.
proxy->channel_args = grpc_channel_args_copy(NULL);
grpc_error* error = grpc_tcp_server_create(
&exec_ctx, NULL, proxy->channel_args, &proxy->server);
GPR_ASSERT(error == GRPC_ERROR_NONE);
// Bind to port.
grpc_resolved_address resolved_addr;
struct sockaddr_in* addr = (struct sockaddr_in*)resolved_addr.addr;
memset(&resolved_addr, 0, sizeof(resolved_addr));
addr->sin_family = AF_INET;
grpc_sockaddr_set_port(&resolved_addr, proxy_port);
int port;
error = grpc_tcp_server_add_port(proxy->server, &resolved_addr, &port);
GPR_ASSERT(error == GRPC_ERROR_NONE);
GPR_ASSERT(port == proxy_port);
// Start server.
proxy->pollset = gpr_malloc(grpc_pollset_size());
grpc_pollset_init(proxy->pollset, &proxy->mu);
grpc_tcp_server_start(&exec_ctx, proxy->server, &proxy->pollset, 1, on_accept,
proxy);
grpc_exec_ctx_finish(&exec_ctx);
// Start proxy thread.
gpr_thd_options opt = gpr_thd_options_default();
gpr_thd_options_set_joinable(&opt);
GPR_ASSERT(gpr_thd_new(&proxy->thd, thread_main, proxy, &opt));
return proxy;
}
static void destroy_pollset(grpc_exec_ctx* exec_ctx, void* arg,
grpc_error* error) {
grpc_pollset* pollset = arg;
grpc_pollset_destroy(pollset);
gpr_free(pollset);
}
void grpc_end2end_http_proxy_destroy(grpc_end2end_http_proxy* proxy) {
gpr_atm_rel_store(&proxy->shutdown, 1); // Signal proxy thread to shutdown.
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
gpr_thd_join(proxy->thd);
grpc_tcp_server_shutdown_listeners(&exec_ctx, proxy->server);
grpc_tcp_server_unref(&exec_ctx, proxy->server);
gpr_free(proxy->proxy_name);
grpc_channel_args_destroy(proxy->channel_args);
grpc_closure destroyed;
grpc_closure_init(&destroyed, destroy_pollset, proxy->pollset);
grpc_pollset_shutdown(&exec_ctx, proxy->pollset, &destroyed);
gpr_free(proxy);
grpc_exec_ctx_finish(&exec_ctx);
}
const char* grpc_end2end_http_proxy_get_proxy_name(
grpc_end2end_http_proxy* proxy) {
return proxy->proxy_name;
}
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