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/*
*
* Copyright 2015, 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 <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 = 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 = 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;
arg.type = GRPC_ARG_STRING;
arg.key = GRPC_ARG_SERVER_URI;
arg.value.string =
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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