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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 "src/core/lib/iomgr/port.h"
#ifdef GRPC_POSIX_SOCKET_RESOLVE_ADDRESS
#include "src/core/lib/iomgr/sockaddr.h"
#include "src/core/lib/iomgr/resolve_address.h"
#include <string.h>
#include <sys/types.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include <grpc/support/time.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/gprpp/thd.h"
#include "src/core/lib/iomgr/block_annotate.h"
#include "src/core/lib/iomgr/executor.h"
#include "src/core/lib/iomgr/iomgr_internal.h"
#include "src/core/lib/iomgr/unix_sockets_posix.h"
static grpc_error* posix_blocking_resolve_address(
const char* name, const char* default_port,
grpc_resolved_addresses** addresses) {
grpc_core::ExecCtx exec_ctx;
struct addrinfo hints;
struct addrinfo *result = nullptr, *resp;
char* host;
char* port;
int s;
size_t i;
grpc_error* err;
if (name[0] == 'u' && name[1] == 'n' && name[2] == 'i' && name[3] == 'x' &&
name[4] == ':' && name[5] != 0) {
return grpc_resolve_unix_domain_address(name + 5, addresses);
}
/* parse name, splitting it into host and port parts */
gpr_split_host_port(name, &host, &port);
if (host == nullptr) {
err = grpc_error_set_str(
GRPC_ERROR_CREATE_FROM_STATIC_STRING("unparseable host:port"),
GRPC_ERROR_STR_TARGET_ADDRESS, grpc_slice_from_copied_string(name));
goto done;
}
if (port == nullptr) {
if (default_port == nullptr) {
err = grpc_error_set_str(
GRPC_ERROR_CREATE_FROM_STATIC_STRING("no port in name"),
GRPC_ERROR_STR_TARGET_ADDRESS, grpc_slice_from_copied_string(name));
goto done;
}
port = gpr_strdup(default_port);
}
/* Call getaddrinfo */
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC; /* ipv4 or ipv6 */
hints.ai_socktype = SOCK_STREAM; /* stream socket */
hints.ai_flags = AI_PASSIVE; /* for wildcard IP address */
GRPC_SCHEDULING_START_BLOCKING_REGION;
s = getaddrinfo(host, port, &hints, &result);
GRPC_SCHEDULING_END_BLOCKING_REGION;
if (s != 0) {
/* Retry if well-known service name is recognized */
const char* svc[][2] = {{"http", "80"}, {"https", "443"}};
for (i = 0; i < GPR_ARRAY_SIZE(svc); i++) {
if (strcmp(port, svc[i][0]) == 0) {
GRPC_SCHEDULING_START_BLOCKING_REGION;
s = getaddrinfo(host, svc[i][1], &hints, &result);
GRPC_SCHEDULING_END_BLOCKING_REGION;
break;
}
}
}
if (s != 0) {
err = grpc_error_set_str(
grpc_error_set_str(
grpc_error_set_str(
grpc_error_set_int(
GRPC_ERROR_CREATE_FROM_STATIC_STRING("OS Error"),
GRPC_ERROR_INT_ERRNO, s),
GRPC_ERROR_STR_OS_ERROR,
grpc_slice_from_static_string(gai_strerror(s))),
GRPC_ERROR_STR_SYSCALL,
grpc_slice_from_static_string("getaddrinfo")),
GRPC_ERROR_STR_TARGET_ADDRESS, grpc_slice_from_copied_string(name));
goto done;
}
/* Success path: set addrs non-NULL, fill it in */
*addresses = static_cast<grpc_resolved_addresses*>(
gpr_malloc(sizeof(grpc_resolved_addresses)));
(*addresses)->naddrs = 0;
for (resp = result; resp != nullptr; resp = resp->ai_next) {
(*addresses)->naddrs++;
}
(*addresses)->addrs = static_cast<grpc_resolved_address*>(
gpr_malloc(sizeof(grpc_resolved_address) * (*addresses)->naddrs));
i = 0;
for (resp = result; resp != nullptr; resp = resp->ai_next) {
memcpy(&(*addresses)->addrs[i].addr, resp->ai_addr, resp->ai_addrlen);
(*addresses)->addrs[i].len = resp->ai_addrlen;
i++;
}
err = GRPC_ERROR_NONE;
done:
gpr_free(host);
gpr_free(port);
if (result) {
freeaddrinfo(result);
}
return err;
}
typedef struct {
char* name;
char* default_port;
grpc_closure* on_done;
grpc_resolved_addresses** addrs_out;
grpc_closure request_closure;
void* arg;
} request;
/* Callback to be passed to grpc_executor to asynch-ify
* grpc_blocking_resolve_address */
static void do_request_thread(void* rp, grpc_error* error) {
request* r = static_cast<request*>(rp);
GRPC_CLOSURE_SCHED(r->on_done, grpc_blocking_resolve_address(
r->name, r->default_port, r->addrs_out));
gpr_free(r->name);
gpr_free(r->default_port);
gpr_free(r);
}
static void posix_resolve_address(const char* name, const char* default_port,
grpc_pollset_set* interested_parties,
grpc_closure* on_done,
grpc_resolved_addresses** addrs) {
request* r = static_cast<request*>(gpr_malloc(sizeof(request)));
GRPC_CLOSURE_INIT(
&r->request_closure, do_request_thread, r,
grpc_executor_scheduler(GRPC_RESOLVER_EXECUTOR, GRPC_EXECUTOR_SHORT));
r->name = gpr_strdup(name);
r->default_port = gpr_strdup(default_port);
r->on_done = on_done;
r->addrs_out = addrs;
GRPC_CLOSURE_SCHED(&r->request_closure, GRPC_ERROR_NONE);
}
grpc_address_resolver_vtable grpc_posix_resolver_vtable = {
posix_resolve_address, posix_blocking_resolve_address};
#endif
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