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/*
*
* 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 <grpc/grpc.h>
#include <string.h>
#include <grpc/support/alloc.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/ext/transport/chttp2/client/chttp2_connector.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/iomgr/sockaddr_utils.h"
#include "src/core/lib/security/credentials/credentials.h"
#include "src/core/lib/security/transport/lb_targets_info.h"
#include "src/core/lib/security/transport/security_connector.h"
#include "src/core/lib/slice/slice_hash_table.h"
#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/surface/api_trace.h"
#include "src/core/lib/surface/channel.h"
static void client_channel_factory_ref(
grpc_client_channel_factory* cc_factory) {}
static void client_channel_factory_unref(
grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* cc_factory) {}
static grpc_subchannel_args* get_secure_naming_subchannel_args(
grpc_exec_ctx* exec_ctx, const grpc_subchannel_args* args) {
grpc_channel_credentials* channel_credentials =
grpc_channel_credentials_find_in_args(args->args);
if (channel_credentials == NULL) {
gpr_log(GPR_ERROR,
"Can't create subchannel: channel credentials missing for secure "
"channel.");
return NULL;
}
// Make sure security connector does not already exist in args.
if (grpc_security_connector_find_in_args(args->args) != NULL) {
gpr_log(GPR_ERROR,
"Can't create subchannel: security connector already present in "
"channel args.");
return NULL;
}
// To which address are we connecting? By default, use the server URI.
const grpc_arg* server_uri_arg =
grpc_channel_args_find(args->args, GRPC_ARG_SERVER_URI);
GPR_ASSERT(server_uri_arg != NULL);
GPR_ASSERT(server_uri_arg->type == GRPC_ARG_STRING);
const char* server_uri_str = server_uri_arg->value.string;
GPR_ASSERT(server_uri_str != NULL);
grpc_uri* server_uri =
grpc_uri_parse(exec_ctx, server_uri_str, true /* supress errors */);
GPR_ASSERT(server_uri != NULL);
const char* server_uri_path;
server_uri_path =
server_uri->path[0] == '/' ? server_uri->path + 1 : server_uri->path;
const grpc_slice_hash_table* targets_info =
grpc_lb_targets_info_find_in_args(args->args);
char* target_name_to_check = NULL;
if (targets_info != NULL) { // LB channel
// Find the balancer name for the target.
const char* target_uri_str =
grpc_get_subchannel_address_uri_arg(args->args);
grpc_uri* target_uri =
grpc_uri_parse(exec_ctx, target_uri_str, false /* suppress errors */);
GPR_ASSERT(target_uri != NULL);
if (target_uri->path[0] != '\0') { // "path" may be empty
const grpc_slice key = grpc_slice_from_static_string(
target_uri->path[0] == '/' ? target_uri->path + 1 : target_uri->path);
const char* value =
(const char*)grpc_slice_hash_table_get(targets_info, key);
if (value != NULL) target_name_to_check = gpr_strdup(value);
grpc_slice_unref_internal(exec_ctx, key);
}
if (target_name_to_check == NULL) {
// If the target name to check hasn't already been set, fall back to using
// SERVER_URI
target_name_to_check = gpr_strdup(server_uri_path);
}
grpc_uri_destroy(target_uri);
} else { // regular channel: the secure name is the original server URI.
target_name_to_check = gpr_strdup(server_uri_path);
}
grpc_uri_destroy(server_uri);
GPR_ASSERT(target_name_to_check != NULL);
grpc_channel_security_connector* subchannel_security_connector = NULL;
// Create the security connector using the credentials and target name.
grpc_channel_args* new_args_from_connector = NULL;
const grpc_security_status security_status =
grpc_channel_credentials_create_security_connector(
exec_ctx, channel_credentials, target_name_to_check, args->args,
&subchannel_security_connector, &new_args_from_connector);
if (security_status != GRPC_SECURITY_OK) {
gpr_log(GPR_ERROR,
"Failed to create secure subchannel for secure name '%s'",
target_name_to_check);
gpr_free(target_name_to_check);
return NULL;
}
gpr_free(target_name_to_check);
grpc_arg new_security_connector_arg =
grpc_security_connector_to_arg(&subchannel_security_connector->base);
grpc_channel_args* new_args = grpc_channel_args_copy_and_add(
new_args_from_connector != NULL ? new_args_from_connector : args->args,
&new_security_connector_arg, 1);
GRPC_SECURITY_CONNECTOR_UNREF(exec_ctx, &subchannel_security_connector->base,
"lb_channel_create");
if (new_args_from_connector != NULL) {
grpc_channel_args_destroy(exec_ctx, new_args_from_connector);
}
grpc_subchannel_args* final_sc_args =
(grpc_subchannel_args*)gpr_malloc(sizeof(*final_sc_args));
memcpy(final_sc_args, args, sizeof(*args));
final_sc_args->args = new_args;
return final_sc_args;
}
static grpc_subchannel* client_channel_factory_create_subchannel(
grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* cc_factory,
const grpc_subchannel_args* args) {
grpc_subchannel_args* subchannel_args =
get_secure_naming_subchannel_args(exec_ctx, args);
if (subchannel_args == NULL) {
gpr_log(
GPR_ERROR,
"Failed to create subchannel arguments during subchannel creation.");
return NULL;
}
grpc_connector* connector = grpc_chttp2_connector_create();
grpc_subchannel* s =
grpc_subchannel_create(exec_ctx, connector, subchannel_args);
grpc_connector_unref(exec_ctx, connector);
grpc_channel_args_destroy(exec_ctx,
(grpc_channel_args*)subchannel_args->args);
gpr_free(subchannel_args);
return s;
}
static grpc_channel* client_channel_factory_create_channel(
grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* cc_factory,
const char* target, grpc_client_channel_type type,
const grpc_channel_args* args) {
if (target == NULL) {
gpr_log(GPR_ERROR, "cannot create channel with NULL target name");
return NULL;
}
// Add channel arg containing the server URI.
grpc_arg arg = grpc_channel_arg_string_create(
(char*)GRPC_ARG_SERVER_URI,
grpc_resolver_factory_add_default_prefix_if_needed(exec_ctx, target));
const char* to_remove[] = {GRPC_ARG_SERVER_URI};
grpc_channel_args* new_args =
grpc_channel_args_copy_and_add_and_remove(args, to_remove, 1, &arg, 1);
gpr_free(arg.value.string);
grpc_channel* channel = grpc_channel_create(exec_ctx, target, new_args,
GRPC_CLIENT_CHANNEL, NULL);
grpc_channel_args_destroy(exec_ctx, new_args);
return channel;
}
static const grpc_client_channel_factory_vtable client_channel_factory_vtable =
{client_channel_factory_ref, client_channel_factory_unref,
client_channel_factory_create_subchannel,
client_channel_factory_create_channel};
static grpc_client_channel_factory client_channel_factory = {
&client_channel_factory_vtable};
// Create a secure client channel:
// Asynchronously: - resolve target
// - connect to it (trying alternatives as presented)
// - perform handshakes
grpc_channel* grpc_secure_channel_create(grpc_channel_credentials* creds,
const char* target,
const grpc_channel_args* args,
void* reserved) {
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
GRPC_API_TRACE(
"grpc_secure_channel_create(creds=%p, target=%s, args=%p, "
"reserved=%p)",
4, ((void*)creds, target, (void*)args, (void*)reserved));
GPR_ASSERT(reserved == NULL);
grpc_channel* channel = NULL;
if (creds != NULL) {
// Add channel args containing the client channel factory and channel
// credentials.
grpc_arg args_to_add[] = {
grpc_client_channel_factory_create_channel_arg(&client_channel_factory),
grpc_channel_credentials_to_arg(creds)};
grpc_channel_args* new_args = grpc_channel_args_copy_and_add(
args, args_to_add, GPR_ARRAY_SIZE(args_to_add));
// Create channel.
channel = client_channel_factory_create_channel(
&exec_ctx, &client_channel_factory, target,
GRPC_CLIENT_CHANNEL_TYPE_REGULAR, new_args);
// Clean up.
grpc_channel_args_destroy(&exec_ctx, new_args);
grpc_exec_ctx_finish(&exec_ctx);
}
return channel != NULL ? channel
: grpc_lame_client_channel_create(
target, GRPC_STATUS_INTERNAL,
"Failed to create secure client channel");
}
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