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/*
*
* Copyright 2018 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 "src/core/lib/iomgr/port.h"
#include <grpc/support/alloc.h>
#include <grpc/support/string_util.h>
#include <grpc/support/log.h>
#include "src/core/lib/gpr/host_port.h"
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/gpr/useful.h"
#include "src/core/lib/iomgr/iomgr_custom.h"
#include "src/core/lib/iomgr/resolve_address_custom.h"
#include "src/core/lib/iomgr/sockaddr_utils.h"
#include <string.h>
typedef struct grpc_custom_resolver {
grpc_closure* on_done;
grpc_resolved_addresses** addresses;
char* host;
char* port;
} grpc_custom_resolver;
static grpc_custom_resolver_vtable* resolve_address_vtable = nullptr;
static int retry_named_port_failure(grpc_custom_resolver* r,
grpc_resolved_addresses** res) {
// This loop is copied from resolve_address_posix.c
const char* svc[][2] = {{"http", "80"}, {"https", "443"}};
for (size_t i = 0; i < GPR_ARRAY_SIZE(svc); i++) {
if (strcmp(r->port, svc[i][0]) == 0) {
gpr_free(r->port);
r->port = gpr_strdup(svc[i][1]);
if (res) {
grpc_error* error =
resolve_address_vtable->resolve(r->host, r->port, res);
if (error != GRPC_ERROR_NONE) {
GRPC_ERROR_UNREF(error);
return 0;
}
} else {
resolve_address_vtable->resolve_async(r, r->host, r->port);
}
return 1;
}
}
return 0;
}
void grpc_custom_resolve_callback(grpc_custom_resolver* r,
grpc_resolved_addresses* result,
grpc_error* error) {
GRPC_CUSTOM_IOMGR_ASSERT_SAME_THREAD();
grpc_core::ExecCtx exec_ctx;
if (error == GRPC_ERROR_NONE) {
*r->addresses = result;
} else if (retry_named_port_failure(r, nullptr)) {
return;
}
if (r->on_done) {
GRPC_CLOSURE_SCHED(r->on_done, error);
}
gpr_free(r->host);
gpr_free(r->port);
gpr_free(r);
}
static grpc_error* try_split_host_port(const char* name,
const char* default_port, char** host,
char** port) {
/* parse name, splitting it into host and port parts */
grpc_error* error;
gpr_split_host_port(name, host, port);
if (*host == nullptr) {
char* msg;
gpr_asprintf(&msg, "unparseable host:port: '%s'", name);
error = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
gpr_free(msg);
return error;
}
if (*port == nullptr) {
// TODO(murgatroid99): add tests for this case
if (default_port == nullptr) {
char* msg;
gpr_asprintf(&msg, "no port in name '%s'", name);
error = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
gpr_free(msg);
return error;
}
*port = gpr_strdup(default_port);
}
return GRPC_ERROR_NONE;
}
static grpc_error* blocking_resolve_address_impl(
const char* name, const char* default_port,
grpc_resolved_addresses** addresses) {
char* host;
char* port;
grpc_error* err;
GRPC_CUSTOM_IOMGR_ASSERT_SAME_THREAD();
err = try_split_host_port(name, default_port, &host, &port);
if (err != GRPC_ERROR_NONE) {
gpr_free(host);
gpr_free(port);
return err;
}
/* Call getaddrinfo */
grpc_custom_resolver resolver;
resolver.host = host;
resolver.port = port;
grpc_resolved_addresses* addrs;
grpc_core::ExecCtx* curr = grpc_core::ExecCtx::Get();
grpc_core::ExecCtx::Set(nullptr);
err = resolve_address_vtable->resolve(host, port, &addrs);
if (err != GRPC_ERROR_NONE) {
if (retry_named_port_failure(&resolver, &addrs)) {
GRPC_ERROR_UNREF(err);
err = GRPC_ERROR_NONE;
}
}
grpc_core::ExecCtx::Set(curr);
if (err == GRPC_ERROR_NONE) {
*addresses = addrs;
}
gpr_free(resolver.host);
gpr_free(resolver.port);
return err;
}
static void resolve_address_impl(const char* name, const char* default_port,
grpc_pollset_set* interested_parties,
grpc_closure* on_done,
grpc_resolved_addresses** addrs) {
grpc_custom_resolver* r = nullptr;
char* host = nullptr;
char* port = nullptr;
grpc_error* err;
GRPC_CUSTOM_IOMGR_ASSERT_SAME_THREAD();
err = try_split_host_port(name, default_port, &host, &port);
if (err != GRPC_ERROR_NONE) {
GRPC_CLOSURE_SCHED(on_done, err);
gpr_free(host);
gpr_free(port);
return;
}
r = (grpc_custom_resolver*)gpr_malloc(sizeof(grpc_custom_resolver));
r->on_done = on_done;
r->addresses = addrs;
r->host = host;
r->port = port;
/* Call getaddrinfo */
resolve_address_vtable->resolve_async(r, r->host, r->port);
}
static grpc_address_resolver_vtable custom_resolver_vtable = {
resolve_address_impl, blocking_resolve_address_impl};
void grpc_custom_resolver_init(grpc_custom_resolver_vtable* impl) {
resolve_address_vtable = impl;
grpc_set_resolver_impl(&custom_resolver_vtable);
}
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