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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/support/port_platform.h>
#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/transport/chttp2/client/chttp2_connector.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/gprpp/memory.h"
#include "src/core/lib/iomgr/sockaddr_utils.h"
#include "src/core/lib/security/credentials/credentials.h"
#include "src/core/lib/security/security_connector/security_connector.h"
#include "src/core/lib/security/transport/target_authority_table.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"
#include "src/core/lib/uri/uri_parser.h"
static void client_channel_factory_ref(
grpc_client_channel_factory* cc_factory) {}
static void client_channel_factory_unref(
grpc_client_channel_factory* cc_factory) {}
static grpc_subchannel_args* get_secure_naming_subchannel_args(
const grpc_subchannel_args* args) {
grpc_channel_credentials* channel_credentials =
grpc_channel_credentials_find_in_args(args->args);
if (channel_credentials == nullptr) {
gpr_log(GPR_ERROR,
"Can't create subchannel: channel credentials missing for secure "
"channel.");
return nullptr;
}
// Make sure security connector does not already exist in args.
if (grpc_security_connector_find_in_args(args->args) != nullptr) {
gpr_log(GPR_ERROR,
"Can't create subchannel: security connector already present in "
"channel args.");
return nullptr;
}
// 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);
const char* server_uri_str = grpc_channel_arg_get_string(server_uri_arg);
GPR_ASSERT(server_uri_str != nullptr);
grpc_uri* server_uri =
grpc_uri_parse(server_uri_str, true /* supress errors */);
GPR_ASSERT(server_uri != nullptr);
const grpc_core::TargetAuthorityTable* target_authority_table =
grpc_core::FindTargetAuthorityTableInArgs(args->args);
grpc_core::UniquePtr<char> authority;
if (target_authority_table != nullptr) {
// Find the authority for the target.
const char* target_uri_str =
grpc_get_subchannel_address_uri_arg(args->args);
grpc_uri* target_uri =
grpc_uri_parse(target_uri_str, false /* suppress errors */);
GPR_ASSERT(target_uri != nullptr);
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 grpc_core::UniquePtr<char>* value =
target_authority_table->Get(key);
if (value != nullptr) authority.reset(gpr_strdup(value->get()));
grpc_slice_unref_internal(key);
}
grpc_uri_destroy(target_uri);
}
// If the authority hasn't already been set (either because no target
// authority table was present or because the target was not present
// in the table), fall back to using the original server URI.
if (authority == nullptr) {
authority =
grpc_core::ResolverRegistry::GetDefaultAuthority(server_uri_str);
}
grpc_arg args_to_add[2];
size_t num_args_to_add = 0;
if (grpc_channel_args_find(args->args, GRPC_ARG_DEFAULT_AUTHORITY) ==
nullptr) {
// If the channel args don't already contain GRPC_ARG_DEFAULT_AUTHORITY, add
// the arg, setting it to the value just obtained.
args_to_add[num_args_to_add++] = grpc_channel_arg_string_create(
const_cast<char*>(GRPC_ARG_DEFAULT_AUTHORITY), authority.get());
}
grpc_channel_args* args_with_authority =
grpc_channel_args_copy_and_add(args->args, args_to_add, num_args_to_add);
grpc_uri_destroy(server_uri);
// Create the security connector using the credentials and target name.
grpc_channel_args* new_args_from_connector = nullptr;
grpc_core::RefCountedPtr<grpc_channel_security_connector>
subchannel_security_connector =
channel_credentials->create_security_connector(
/*call_creds=*/nullptr, authority.get(), args_with_authority,
&new_args_from_connector);
if (subchannel_security_connector == nullptr) {
gpr_log(GPR_ERROR,
"Failed to create secure subchannel for secure name '%s'",
authority.get());
grpc_channel_args_destroy(args_with_authority);
return nullptr;
}
grpc_arg new_security_connector_arg =
grpc_security_connector_to_arg(subchannel_security_connector.get());
grpc_channel_args* new_args = grpc_channel_args_copy_and_add(
new_args_from_connector != nullptr ? new_args_from_connector
: args_with_authority,
&new_security_connector_arg, 1);
subchannel_security_connector.reset(DEBUG_LOCATION, "lb_channel_create");
if (new_args_from_connector != nullptr) {
grpc_channel_args_destroy(new_args_from_connector);
}
grpc_channel_args_destroy(args_with_authority);
grpc_subchannel_args* final_sc_args =
static_cast<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_client_channel_factory* cc_factory, const grpc_subchannel_args* args) {
grpc_subchannel_args* subchannel_args =
get_secure_naming_subchannel_args(args);
if (subchannel_args == nullptr) {
gpr_log(
GPR_ERROR,
"Failed to create subchannel arguments during subchannel creation.");
return nullptr;
}
grpc_connector* connector = grpc_chttp2_connector_create();
grpc_subchannel* s = grpc_subchannel_create(connector, subchannel_args);
grpc_connector_unref(connector);
grpc_channel_args_destroy(
const_cast<grpc_channel_args*>(subchannel_args->args));
gpr_free(subchannel_args);
return s;
}
static grpc_channel* client_channel_factory_create_channel(
grpc_client_channel_factory* cc_factory, const char* target,
grpc_client_channel_type type, const grpc_channel_args* args) {
if (target == nullptr) {
gpr_log(GPR_ERROR, "cannot create channel with NULL target name");
return nullptr;
}
// Add channel arg containing the server URI.
grpc_core::UniquePtr<char> canonical_target =
grpc_core::ResolverRegistry::AddDefaultPrefixIfNeeded(target);
grpc_arg arg = grpc_channel_arg_string_create((char*)GRPC_ARG_SERVER_URI,
canonical_target.get());
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);
grpc_channel* channel =
grpc_channel_create(target, new_args, GRPC_CLIENT_CHANNEL, nullptr);
grpc_channel_args_destroy(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_core::ExecCtx exec_ctx;
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 == nullptr);
grpc_channel* channel = nullptr;
if (creds != nullptr) {
// 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(
&client_channel_factory, target, GRPC_CLIENT_CHANNEL_TYPE_REGULAR,
new_args);
// Clean up.
grpc_channel_args_destroy(new_args);
}
return channel != nullptr ? channel
: grpc_lame_client_channel_create(
target, GRPC_STATUS_INTERNAL,
"Failed to create secure client channel");
}
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