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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/slice/slice_internal.h"
#include "src/core/lib/surface/api_trace.h"
#include "src/core/lib/surface/channel.h"
#include "src/core/lib/transport/authority_override.h"
#include "src/core/lib/uri/uri_parser.h"
namespace grpc_core {
class Chttp2SecureClientChannelFactory : public ClientChannelFactory {
public:
Subchannel* CreateSubchannel(const grpc_channel_args* args) override {
grpc_channel_args* new_args = GetSecureNamingChannelArgs(args);
if (new_args == nullptr) {
gpr_log(GPR_ERROR,
"Failed to create channel args during subchannel creation.");
return nullptr;
}
Subchannel* s =
Subchannel::Create(MakeOrphanable<Chttp2Connector>(), new_args);
grpc_channel_args_destroy(new_args);
return s;
}
private:
static grpc_channel_args* GetSecureNamingChannelArgs(
const grpc_channel_args* args) {
grpc_channel_credentials* channel_credentials =
grpc_channel_credentials_find_in_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) != nullptr) {
gpr_log(GPR_ERROR,
"Can't create subchannel: security connector already present in "
"channel args.");
return nullptr;
}
// Find the authority to use in the security connector.
// First, check the authority override channel arg.
// Otherwise, get it from the server name used to construct the
// channel.
std::string authority(FindAuthorityOverrideInArgs(args));
if (authority.empty()) {
const char* server_uri_str =
grpc_channel_args_find_string(args, GRPC_ARG_SERVER_URI);
GPR_ASSERT(server_uri_str != nullptr);
authority = ResolverRegistry::GetDefaultAuthority(server_uri_str);
}
grpc_arg args_to_add[2];
size_t num_args_to_add = 0;
if (grpc_channel_args_find(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),
const_cast<char*>(authority.c_str()));
}
grpc_channel_args* args_with_authority =
grpc_channel_args_copy_and_add(args, args_to_add, num_args_to_add);
// Create the security connector using the credentials and target name.
grpc_channel_args* new_args_from_connector = nullptr;
RefCountedPtr<grpc_channel_security_connector>
subchannel_security_connector =
channel_credentials->create_security_connector(
/*call_creds=*/nullptr, authority.c_str(), 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.c_str());
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);
return new_args;
}
};
namespace {
grpc_channel* CreateChannel(const char* target, const grpc_channel_args* args,
grpc_error** error) {
if (target == nullptr) {
gpr_log(GPR_ERROR, "cannot create channel with NULL target name");
if (error != nullptr) {
*error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("channel target is NULL");
}
return nullptr;
}
// Add channel arg containing the server URI.
grpc_core::UniquePtr<char> canonical_target =
ResolverRegistry::AddDefaultPrefixIfNeeded(target);
grpc_arg arg = grpc_channel_arg_string_create(
const_cast<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, nullptr, error);
grpc_channel_args_destroy(new_args);
return channel;
}
} // namespace
} // namespace grpc_core
namespace {
grpc_core::Chttp2SecureClientChannelFactory* g_factory;
gpr_once g_factory_once = GPR_ONCE_INIT;
void FactoryInit() {
g_factory = new grpc_core::Chttp2SecureClientChannelFactory();
}
} // namespace
// 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;
grpc_error* error = GRPC_ERROR_NONE;
if (creds != nullptr) {
// Add channel args containing the client channel factory and channel
// credentials.
gpr_once_init(&g_factory_once, FactoryInit);
grpc_arg channel_factory_arg =
grpc_core::ClientChannelFactory::CreateChannelArg(g_factory);
grpc_arg args_to_add[] = {channel_factory_arg,
grpc_channel_credentials_to_arg(creds)};
const char* arg_to_remove = channel_factory_arg.key;
grpc_channel_args* new_args = grpc_channel_args_copy_and_add_and_remove(
args, &arg_to_remove, 1, args_to_add, GPR_ARRAY_SIZE(args_to_add));
new_args = creds->update_arguments(new_args);
// Create channel.
channel = grpc_core::CreateChannel(target, new_args, &error);
// Clean up.
grpc_channel_args_destroy(new_args);
}
if (channel == nullptr) {
intptr_t integer;
grpc_status_code status = GRPC_STATUS_INTERNAL;
if (grpc_error_get_int(error, GRPC_ERROR_INT_GRPC_STATUS, &integer)) {
status = static_cast<grpc_status_code>(integer);
}
GRPC_ERROR_UNREF(error);
channel = grpc_lame_client_channel_create(
target, status, "Failed to create secure client channel");
}
return channel;
}
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