Changes for C to C++. Adding extern C to header files for compatibility.

Also converting to .cc

1 files changed, 376 insertions, 0 deletions

diff --git a/src/core/ext/filters/client_channel/http_connect_handshaker.cc b/src/core/ext/filters/client_channel/http_connect_handshaker.cc
new file mode 100644
index 0000000000..418bb41ef6
--- /dev/null
+++ b/src/core/ext/filters/client_channel/http_connect_handshaker.cc
@@ -0,0 +1,376 @@
+/*
+ *
+ * Copyright 2016 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/client_channel/http_connect_handshaker.h"
+
+#include <string.h>
+
+#include <grpc/slice_buffer.h>
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+
+#include "src/core/ext/filters/client_channel/client_channel.h"
+#include "src/core/ext/filters/client_channel/resolver_registry.h"
+#include "src/core/ext/filters/client_channel/uri_parser.h"
+#include "src/core/lib/channel/channel_args.h"
+#include "src/core/lib/channel/handshaker_registry.h"
+#include "src/core/lib/http/format_request.h"
+#include "src/core/lib/http/parser.h"
+#include "src/core/lib/slice/slice_internal.h"
+#include "src/core/lib/support/env.h"
+#include "src/core/lib/support/string.h"
+
+typedef struct http_connect_handshaker {
+  // Base class.  Must be first.
+  grpc_handshaker base;
+
+  gpr_refcount refcount;
+  gpr_mu mu;
+
+  bool shutdown;
+  // Endpoint and read buffer to destroy after a shutdown.
+  grpc_endpoint* endpoint_to_destroy;
+  grpc_slice_buffer* read_buffer_to_destroy;
+
+  // State saved while performing the handshake.
+  grpc_handshaker_args* args;
+  grpc_closure* on_handshake_done;
+
+  // Objects for processing the HTTP CONNECT request and response.
+  grpc_slice_buffer write_buffer;
+  grpc_closure request_done_closure;
+  grpc_closure response_read_closure;
+  grpc_http_parser http_parser;
+  grpc_http_response http_response;
+} http_connect_handshaker;
+
+// Unref and clean up handshaker.
+static void http_connect_handshaker_unref(grpc_exec_ctx* exec_ctx,
+                                          http_connect_handshaker* handshaker) {
+  if (gpr_unref(&handshaker->refcount)) {
+    gpr_mu_destroy(&handshaker->mu);
+    if (handshaker->endpoint_to_destroy != NULL) {
+      grpc_endpoint_destroy(exec_ctx, handshaker->endpoint_to_destroy);
+    }
+    if (handshaker->read_buffer_to_destroy != NULL) {
+      grpc_slice_buffer_destroy_internal(exec_ctx,
+                                         handshaker->read_buffer_to_destroy);
+      gpr_free(handshaker->read_buffer_to_destroy);
+    }
+    grpc_slice_buffer_destroy_internal(exec_ctx, &handshaker->write_buffer);
+    grpc_http_parser_destroy(&handshaker->http_parser);
+    grpc_http_response_destroy(&handshaker->http_response);
+    gpr_free(handshaker);
+  }
+}
+
+// Set args fields to NULL, saving the endpoint and read buffer for
+// later destruction.
+static void cleanup_args_for_failure_locked(
+    grpc_exec_ctx* exec_ctx, http_connect_handshaker* handshaker) {
+  handshaker->endpoint_to_destroy = handshaker->args->endpoint;
+  handshaker->args->endpoint = NULL;
+  handshaker->read_buffer_to_destroy = handshaker->args->read_buffer;
+  handshaker->args->read_buffer = NULL;
+  grpc_channel_args_destroy(exec_ctx, handshaker->args->args);
+  handshaker->args->args = NULL;
+}
+
+// If the handshake failed or we're shutting down, clean up and invoke the
+// callback with the error.
+static void handshake_failed_locked(grpc_exec_ctx* exec_ctx,
+                                    http_connect_handshaker* handshaker,
+                                    grpc_error* error) {
+  if (error == GRPC_ERROR_NONE) {
+    // If we were shut down after an endpoint operation succeeded but
+    // before the endpoint callback was invoked, we need to generate our
+    // own error.
+    error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("Handshaker shutdown");
+  }
+  if (!handshaker->shutdown) {
+    // TODO(ctiller): It is currently necessary to shutdown endpoints
+    // before destroying them, even if we know that there are no
+    // pending read/write callbacks.  This should be fixed, at which
+    // point this can be removed.
+    grpc_endpoint_shutdown(exec_ctx, handshaker->args->endpoint,
+                           GRPC_ERROR_REF(error));
+    // Not shutting down, so the handshake failed.  Clean up before
+    // invoking the callback.
+    cleanup_args_for_failure_locked(exec_ctx, handshaker);
+    // Set shutdown to true so that subsequent calls to
+    // http_connect_handshaker_shutdown() do nothing.
+    handshaker->shutdown = true;
+  }
+  // Invoke callback.
+  GRPC_CLOSURE_SCHED(exec_ctx, handshaker->on_handshake_done, error);
+}
+
+// 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 = (http_connect_handshaker*)arg;
+  gpr_mu_lock(&handshaker->mu);
+  if (error != GRPC_ERROR_NONE || handshaker->shutdown) {
+    // If the write failed or we're shutting down, clean up and invoke the
+    // callback with the error.
+    handshake_failed_locked(exec_ctx, handshaker, GRPC_ERROR_REF(error));
+    gpr_mu_unlock(&handshaker->mu);
+    http_connect_handshaker_unref(exec_ctx, handshaker);
+  } else {
+    // Otherwise, read the response.
+    // The read callback inherits our ref to the handshaker.
+    grpc_endpoint_read(exec_ctx, handshaker->args->endpoint,
+                       handshaker->args->read_buffer,
+                       &handshaker->response_read_closure);
+    gpr_mu_unlock(&handshaker->mu);
+  }
+}
+
+// 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 = (http_connect_handshaker*)arg;
+  gpr_mu_lock(&handshaker->mu);
+  if (error != GRPC_ERROR_NONE || handshaker->shutdown) {
+    // If the read failed or we're shutting down, clean up and invoke the
+    // callback with the error.
+    handshake_failed_locked(exec_ctx, handshaker, GRPC_ERROR_REF(error));
+    goto done;
+  }
+  // Add buffer to parser.
+  for (size_t i = 0; i < handshaker->args->read_buffer->count; ++i) {
+    if (GRPC_SLICE_LENGTH(handshaker->args->read_buffer->slices[i]) > 0) {
+      size_t body_start_offset = 0;
+      error = grpc_http_parser_parse(&handshaker->http_parser,
+                                     handshaker->args->read_buffer->slices[i],
+                                     &body_start_offset);
+      if (error != GRPC_ERROR_NONE) {
+        handshake_failed_locked(exec_ctx, handshaker, error);
+        goto done;
+      }
+      if (handshaker->http_parser.state == GRPC_HTTP_BODY) {
+        // Remove the data we've already read from the read buffer,
+        // leaving only the leftover bytes (if any).
+        grpc_slice_buffer tmp_buffer;
+        grpc_slice_buffer_init(&tmp_buffer);
+        if (body_start_offset <
+            GRPC_SLICE_LENGTH(handshaker->args->read_buffer->slices[i])) {
+          grpc_slice_buffer_add(
+              &tmp_buffer,
+              grpc_slice_split_tail(&handshaker->args->read_buffer->slices[i],
+                                    body_start_offset));
+        }
+        grpc_slice_buffer_addn(&tmp_buffer,
+                               &handshaker->args->read_buffer->slices[i + 1],
+                               handshaker->args->read_buffer->count - i - 1);
+        grpc_slice_buffer_swap(handshaker->args->read_buffer, &tmp_buffer);
+        grpc_slice_buffer_destroy_internal(exec_ctx, &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) {
+    grpc_slice_buffer_reset_and_unref_internal(exec_ctx,
+                                               handshaker->args->read_buffer);
+    grpc_endpoint_read(exec_ctx, handshaker->args->endpoint,
+                       handshaker->args->read_buffer,
+                       &handshaker->response_read_closure);
+    gpr_mu_unlock(&handshaker->mu);
+    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_FROM_COPIED_STRING(msg);
+    gpr_free(msg);
+    handshake_failed_locked(exec_ctx, handshaker, error);
+    goto done;
+  }
+  // Success.  Invoke handshake-done callback.
+  GRPC_CLOSURE_SCHED(exec_ctx, handshaker->on_handshake_done, error);
+done:
+  // Set shutdown to true so that subsequent calls to
+  // http_connect_handshaker_shutdown() do nothing.
+  handshaker->shutdown = true;
+  gpr_mu_unlock(&handshaker->mu);
+  http_connect_handshaker_unref(exec_ctx, handshaker);
+}
+
+//
+// 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(exec_ctx, handshaker);
+}
+
+static void http_connect_handshaker_shutdown(grpc_exec_ctx* exec_ctx,
+                                             grpc_handshaker* handshaker_in,
+                                             grpc_error* why) {
+  http_connect_handshaker* handshaker = (http_connect_handshaker*)handshaker_in;
+  gpr_mu_lock(&handshaker->mu);
+  if (!handshaker->shutdown) {
+    handshaker->shutdown = true;
+    grpc_endpoint_shutdown(exec_ctx, handshaker->args->endpoint,
+                           GRPC_ERROR_REF(why));
+    cleanup_args_for_failure_locked(exec_ctx, handshaker);
+  }
+  gpr_mu_unlock(&handshaker->mu);
+  GRPC_ERROR_UNREF(why);
+}
+
+static void http_connect_handshaker_do_handshake(
+    grpc_exec_ctx* exec_ctx, grpc_handshaker* handshaker_in,
+    grpc_tcp_server_acceptor* acceptor, grpc_closure* on_handshake_done,
+    grpc_handshaker_args* args) {
+  http_connect_handshaker* handshaker = (http_connect_handshaker*)handshaker_in;
+  // Check for HTTP CONNECT channel arg.
+  // If not found, invoke on_handshake_done without doing anything.
+  const grpc_arg* arg =
+      grpc_channel_args_find(args->args, GRPC_ARG_HTTP_CONNECT_SERVER);
+  if (arg == NULL) {
+    // Set shutdown to true so that subsequent calls to
+    // http_connect_handshaker_shutdown() do nothing.
+    gpr_mu_lock(&handshaker->mu);
+    handshaker->shutdown = true;
+    gpr_mu_unlock(&handshaker->mu);
+    GRPC_CLOSURE_SCHED(exec_ctx, on_handshake_done, GRPC_ERROR_NONE);
+    return;
+  }
+  GPR_ASSERT(arg->type == GRPC_ARG_STRING);
+  char* server_name = arg->value.string;
+  // Get headers from channel args.
+  arg = grpc_channel_args_find(args->args, GRPC_ARG_HTTP_CONNECT_HEADERS);
+  grpc_http_header* headers = NULL;
+  size_t num_headers = 0;
+  char** header_strings = NULL;
+  size_t num_header_strings = 0;
+  if (arg != NULL) {
+    GPR_ASSERT(arg->type == GRPC_ARG_STRING);
+    gpr_string_split(arg->value.string, "\n", &header_strings,
+                     &num_header_strings);
+    headers = (grpc_http_header*)gpr_malloc(sizeof(grpc_http_header) *
+                                            num_header_strings);
+    for (size_t i = 0; i < num_header_strings; ++i) {
+      char* sep = strchr(header_strings[i], ':');
+      if (sep == NULL) {
+        gpr_log(GPR_ERROR, "skipping unparseable HTTP CONNECT header: %s",
+                header_strings[i]);
+        continue;
+      }
+      *sep = '\0';
+      headers[num_headers].key = header_strings[i];
+      headers[num_headers].value = sep + 1;
+      ++num_headers;
+    }
+  }
+  // Save state in the handshaker object.
+  gpr_mu_lock(&handshaker->mu);
+  handshaker->args = args;
+  handshaker->on_handshake_done = on_handshake_done;
+  // Log connection via proxy.
+  char* proxy_name = grpc_endpoint_get_peer(args->endpoint);
+  gpr_log(GPR_INFO, "Connecting to server %s via HTTP proxy %s", server_name,
+          proxy_name);
+  gpr_free(proxy_name);
+  // Construct HTTP CONNECT request.
+  grpc_httpcli_request request;
+  memset(&request, 0, sizeof(request));
+  request.host = server_name;
+  request.http.method = (char*)"CONNECT";
+  request.http.path = server_name;
+  request.http.hdrs = headers;
+  request.http.hdr_count = num_headers;
+  request.handshaker = &grpc_httpcli_plaintext;
+  grpc_slice request_slice = grpc_httpcli_format_connect_request(&request);
+  grpc_slice_buffer_add(&handshaker->write_buffer, request_slice);
+  // Clean up.
+  gpr_free(headers);
+  for (size_t i = 0; i < num_header_strings; ++i) {
+    gpr_free(header_strings[i]);
+  }
+  gpr_free(header_strings);
+  // Take a new ref to be held by the write callback.
+  gpr_ref(&handshaker->refcount);
+  grpc_endpoint_write(exec_ctx, args->endpoint, &handshaker->write_buffer,
+                      &handshaker->request_done_closure);
+  gpr_mu_unlock(&handshaker->mu);
+}
+
+static const grpc_handshaker_vtable http_connect_handshaker_vtable = {
+    http_connect_handshaker_destroy, http_connect_handshaker_shutdown,
+    http_connect_handshaker_do_handshake};
+
+static grpc_handshaker* grpc_http_connect_handshaker_create() {
+  http_connect_handshaker* handshaker =
+      (http_connect_handshaker*)gpr_malloc(sizeof(*handshaker));
+  memset(handshaker, 0, sizeof(*handshaker));
+  grpc_handshaker_init(&http_connect_handshaker_vtable, &handshaker->base);
+  gpr_mu_init(&handshaker->mu);
+  gpr_ref_init(&handshaker->refcount, 1);
+  grpc_slice_buffer_init(&handshaker->write_buffer);
+  GRPC_CLOSURE_INIT(&handshaker->request_done_closure, on_write_done,
+                    handshaker, grpc_schedule_on_exec_ctx);
+  GRPC_CLOSURE_INIT(&handshaker->response_read_closure, on_read_done,
+                    handshaker, grpc_schedule_on_exec_ctx);
+  grpc_http_parser_init(&handshaker->http_parser, GRPC_HTTP_RESPONSE,
+                        &handshaker->http_response);
+  return &handshaker->base;
+}
+
+//
+// handshaker factory
+//
+
+static void handshaker_factory_add_handshakers(
+    grpc_exec_ctx* exec_ctx, grpc_handshaker_factory* factory,
+    const grpc_channel_args* args, grpc_handshake_manager* handshake_mgr) {
+  grpc_handshake_manager_add(handshake_mgr,
+                             grpc_http_connect_handshaker_create());
+}
+
+static void handshaker_factory_destroy(grpc_exec_ctx* exec_ctx,
+                                       grpc_handshaker_factory* factory) {}
+
+static const grpc_handshaker_factory_vtable handshaker_factory_vtable = {
+    handshaker_factory_add_handshakers, handshaker_factory_destroy};
+
+static grpc_handshaker_factory handshaker_factory = {
+    &handshaker_factory_vtable};
+
+void grpc_http_connect_register_handshaker_factory() {
+  grpc_handshaker_factory_register(true /* at_start */, HANDSHAKER_CLIENT,
+                                   &handshaker_factory);
+}