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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 "src/core/ext/client_config/http_connect_handshaker.h"
#include <string.h>
#include <grpc/impl/codegen/alloc.h>
#include <grpc/impl/codegen/log.h>
#include <grpc/impl/codegen/slice_buffer.h>
#include <grpc/support/string_util.h>
#include "src/core/ext/client_config/uri_parser.h"
#include "src/core/lib/http/format_request.h"
#include "src/core/lib/http/parser.h"
#include "src/core/lib/iomgr/timer.h"
#include "src/core/lib/support/env.h"
typedef struct http_connect_handshaker {
// Base class. Must be first.
grpc_handshaker base;
char* proxy_server;
char* server_name;
// State saved while performing the handshake.
grpc_endpoint* endpoint;
grpc_channel_args* args;
grpc_handshaker_done_cb cb;
void* user_data;
// Objects for processing the HTTP CONNECT request and response.
gpr_slice_buffer write_buffer;
gpr_slice_buffer* read_buffer; // Ownership passes through this object.
grpc_closure request_done_closure;
grpc_closure response_read_closure;
grpc_http_parser http_parser;
grpc_http_response http_response;
grpc_timer timeout_timer;
gpr_refcount refcount;
} http_connect_handshaker;
// Unref and clean up handshaker.
static void http_connect_handshaker_unref(http_connect_handshaker* handshaker) {
if (gpr_unref(&handshaker->refcount)) {
gpr_free(handshaker->proxy_server);
gpr_free(handshaker->server_name);
gpr_slice_buffer_destroy(&handshaker->write_buffer);
grpc_http_parser_destroy(&handshaker->http_parser);
grpc_http_response_destroy(&handshaker->http_response);
gpr_free(handshaker);
}
}
// Callback invoked when deadline is exceeded.
static void on_timeout(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) {
http_connect_handshaker* handshaker = arg;
if (error == GRPC_ERROR_NONE) { // Timer fired, rather than being cancelled.
grpc_endpoint_shutdown(exec_ctx, handshaker->endpoint);
}
http_connect_handshaker_unref(handshaker);
}
// Callback invoked when finished writing HTTP CONNECT request.
static void on_write_done(grpc_exec_ctx* exec_ctx, void* arg,
grpc_error* error) {
http_connect_handshaker* handshaker = arg;
if (error != GRPC_ERROR_NONE) {
// If the write failed, invoke the callback immediately with the error.
handshaker->cb(exec_ctx, handshaker->endpoint, handshaker->args,
handshaker->read_buffer, handshaker->user_data,
GRPC_ERROR_REF(error));
} else {
// Otherwise, read the response.
grpc_endpoint_read(exec_ctx, handshaker->endpoint, handshaker->read_buffer,
&handshaker->response_read_closure);
}
}
// Callback invoked for reading HTTP CONNECT response.
static void on_read_done(grpc_exec_ctx* exec_ctx, void* arg,
grpc_error* error) {
http_connect_handshaker* handshaker = arg;
if (error != GRPC_ERROR_NONE) {
GRPC_ERROR_REF(error); // Take ref to pass to the handshake-done callback.
goto done;
}
// Add buffer to parser.
for (size_t i = 0; i < handshaker->read_buffer->count; ++i) {
if (GPR_SLICE_LENGTH(handshaker->read_buffer->slices[i]) > 0) {
size_t body_start_offset = 0;
error = grpc_http_parser_parse(&handshaker->http_parser,
handshaker->read_buffer->slices[i],
&body_start_offset);
if (error != GRPC_ERROR_NONE) goto done;
if (handshaker->http_parser.state == GRPC_HTTP_BODY) {
// We've gotten back a successul response, so stop the timeout timer.
grpc_timer_cancel(exec_ctx, &handshaker->timeout_timer);
// Remove the data we've already read from the read buffer,
// leaving only the leftover bytes (if any).
gpr_slice_buffer tmp_buffer;
gpr_slice_buffer_init(&tmp_buffer);
if (body_start_offset <
GPR_SLICE_LENGTH(handshaker->read_buffer->slices[i])) {
gpr_slice_buffer_add(
&tmp_buffer,
gpr_slice_split_tail(&handshaker->read_buffer->slices[i],
body_start_offset));
}
gpr_slice_buffer_addn(&tmp_buffer,
&handshaker->read_buffer->slices[i + 1],
handshaker->read_buffer->count - i - 1);
gpr_slice_buffer_swap(handshaker->read_buffer, &tmp_buffer);
gpr_slice_buffer_destroy(&tmp_buffer);
break;
}
}
}
// If we're not done reading the response, read more data.
// TODO(roth): In practice, I suspect that the response to a CONNECT
// request will never include a body, in which case this check is
// sufficient. However, the language of RFC-2817 doesn't explicitly
// forbid the response from including a body. If there is a body,
// it's possible that we might have parsed part but not all of the
// body, in which case this check will cause us to fail to parse the
// remainder of the body. If that ever becomes an issue, we may
// need to fix the HTTP parser to understand when the body is
// complete (e.g., handling chunked transfer encoding or looking
// at the Content-Length: header).
if (handshaker->http_parser.state != GRPC_HTTP_BODY) {
gpr_slice_buffer_reset_and_unref(handshaker->read_buffer);
grpc_endpoint_read(exec_ctx, handshaker->endpoint, handshaker->read_buffer,
&handshaker->response_read_closure);
return;
}
// Make sure we got a 2xx response.
if (handshaker->http_response.status < 200 ||
handshaker->http_response.status >= 300) {
char* msg;
gpr_asprintf(&msg, "HTTP proxy returned response code %d",
handshaker->http_response.status);
error = GRPC_ERROR_CREATE(msg);
gpr_free(msg);
}
done:
// Invoke handshake-done callback.
handshaker->cb(exec_ctx, handshaker->endpoint, handshaker->args,
handshaker->read_buffer, handshaker->user_data, error);
}
//
// Public handshaker methods
//
static void http_connect_handshaker_destroy(grpc_exec_ctx* exec_ctx,
grpc_handshaker* handshaker_in) {
http_connect_handshaker* handshaker = (http_connect_handshaker*)handshaker_in;
http_connect_handshaker_unref(handshaker);
}
static void http_connect_handshaker_shutdown(grpc_exec_ctx* exec_ctx,
grpc_handshaker* handshaker) {}
static void http_connect_handshaker_do_handshake(
grpc_exec_ctx* exec_ctx, grpc_handshaker* handshaker_in,
grpc_endpoint* endpoint, grpc_channel_args* args,
gpr_slice_buffer* read_buffer, gpr_timespec deadline,
grpc_tcp_server_acceptor* acceptor, grpc_handshaker_done_cb cb,
void* user_data) {
http_connect_handshaker* handshaker = (http_connect_handshaker*)handshaker_in;
// Save state in the handshaker object.
handshaker->endpoint = endpoint;
handshaker->args = args;
handshaker->cb = cb;
handshaker->user_data = user_data;
handshaker->read_buffer = read_buffer;
// Send HTTP CONNECT request.
gpr_log(GPR_INFO, "Connecting to server %s via HTTP proxy %s",
handshaker->server_name, handshaker->proxy_server);
grpc_httpcli_request request;
memset(&request, 0, sizeof(request));
request.host = handshaker->proxy_server;
request.http.method = "CONNECT";
request.http.path = handshaker->server_name;
request.handshaker = &grpc_httpcli_plaintext;
gpr_slice request_slice = grpc_httpcli_format_connect_request(&request);
gpr_slice_buffer_add(&handshaker->write_buffer, request_slice);
grpc_endpoint_write(exec_ctx, endpoint, &handshaker->write_buffer,
&handshaker->request_done_closure);
// Set timeout timer. The timer gets a reference to the handshaker.
gpr_ref(&handshaker->refcount);
grpc_timer_init(exec_ctx, &handshaker->timeout_timer,
gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC),
on_timeout, handshaker, gpr_now(GPR_CLOCK_MONOTONIC));
}
static const struct grpc_handshaker_vtable http_connect_handshaker_vtable = {
http_connect_handshaker_destroy, http_connect_handshaker_shutdown,
http_connect_handshaker_do_handshake};
grpc_handshaker* grpc_http_connect_handshaker_create(const char* proxy_server,
const char* server_name) {
GPR_ASSERT(proxy_server != NULL);
GPR_ASSERT(server_name != NULL);
http_connect_handshaker* handshaker =
gpr_malloc(sizeof(http_connect_handshaker));
memset(handshaker, 0, sizeof(*handshaker));
grpc_handshaker_init(&http_connect_handshaker_vtable, &handshaker->base);
handshaker->proxy_server = gpr_strdup(proxy_server);
handshaker->server_name = gpr_strdup(server_name);
gpr_slice_buffer_init(&handshaker->write_buffer);
grpc_closure_init(&handshaker->request_done_closure, on_write_done,
handshaker);
grpc_closure_init(&handshaker->response_read_closure, on_read_done,
handshaker);
grpc_http_parser_init(&handshaker->http_parser, GRPC_HTTP_RESPONSE,
&handshaker->http_response);
gpr_ref_init(&handshaker->refcount, 1);
return &handshaker->base;
}
char* grpc_get_http_proxy_server() {
char* uri_str = gpr_getenv("http_proxy");
if (uri_str == NULL) return NULL;
grpc_uri* uri = grpc_uri_parse(uri_str, false /* suppress_errors */);
char* proxy_name = NULL;
if (uri == NULL || uri->authority == NULL) {
gpr_log(GPR_ERROR, "cannot parse value of 'http_proxy' env var");
goto done;
}
if (strcmp(uri->scheme, "http") != 0) {
gpr_log(GPR_ERROR, "'%s' scheme not supported in proxy URI", uri->scheme);
goto done;
}
if (strchr(uri->authority, '@') != NULL) {
gpr_log(GPR_ERROR, "userinfo not supported in proxy URI");
goto done;
}
proxy_name = gpr_strdup(uri->authority);
done:
grpc_uri_destroy(uri);
return proxy_name;
}
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