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/*
*
* Copyright 2017 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_HAVE_IFADDRS
#include "src/core/lib/iomgr/tcp_server_utils_posix.h"
#include <errno.h>
#include <ifaddrs.h>
#include <stddef.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "src/core/lib/iomgr/error.h"
#include "src/core/lib/iomgr/sockaddr.h"
#include "src/core/lib/iomgr/sockaddr_utils.h"
/* Return the listener in s with address addr or NULL. */
static grpc_tcp_listener* find_listener_with_addr(grpc_tcp_server* s,
grpc_resolved_address* addr) {
grpc_tcp_listener* l;
gpr_mu_lock(&s->mu);
for (l = s->head; l != nullptr; l = l->next) {
if (l->addr.len != addr->len) {
continue;
}
if (memcmp(l->addr.addr, addr->addr, addr->len) == 0) {
break;
}
}
gpr_mu_unlock(&s->mu);
return l;
}
/* Bind to "::" to get a port number not used by any address. */
static grpc_error* get_unused_port(int* port) {
grpc_resolved_address wild;
grpc_sockaddr_make_wildcard6(0, &wild);
grpc_dualstack_mode dsmode;
int fd;
grpc_error* err =
grpc_create_dualstack_socket(&wild, SOCK_STREAM, 0, &dsmode, &fd);
if (err != GRPC_ERROR_NONE) {
return err;
}
if (dsmode == GRPC_DSMODE_IPV4) {
grpc_sockaddr_make_wildcard4(0, &wild);
}
if (bind(fd, reinterpret_cast<const grpc_sockaddr*>(wild.addr), wild.len) !=
0) {
err = GRPC_OS_ERROR(errno, "bind");
close(fd);
return err;
}
if (getsockname(fd, reinterpret_cast<grpc_sockaddr*>(wild.addr), &wild.len) !=
0) {
err = GRPC_OS_ERROR(errno, "getsockname");
close(fd);
return err;
}
close(fd);
*port = grpc_sockaddr_get_port(&wild);
return *port <= 0 ? GRPC_ERROR_CREATE_FROM_STATIC_STRING("Bad port")
: GRPC_ERROR_NONE;
}
grpc_error* grpc_tcp_server_add_all_local_addrs(grpc_tcp_server* s,
unsigned port_index,
int requested_port,
int* out_port) {
struct ifaddrs* ifa = nullptr;
struct ifaddrs* ifa_it;
unsigned fd_index = 0;
grpc_tcp_listener* sp = nullptr;
grpc_error* err = GRPC_ERROR_NONE;
if (requested_port == 0) {
/* Note: There could be a race where some local addrs can listen on the
selected port and some can't. The sane way to handle this would be to
retry by recreating the whole grpc_tcp_server. Backing out individual
listeners and orphaning the FDs looks like too much trouble. */
if ((err = get_unused_port(&requested_port)) != GRPC_ERROR_NONE) {
return err;
} else if (requested_port <= 0) {
return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Bad get_unused_port()");
}
gpr_log(GPR_DEBUG, "Picked unused port %d", requested_port);
}
if (getifaddrs(&ifa) != 0 || ifa == nullptr) {
return GRPC_OS_ERROR(errno, "getifaddrs");
}
for (ifa_it = ifa; ifa_it != nullptr; ifa_it = ifa_it->ifa_next) {
grpc_resolved_address addr;
char* addr_str = nullptr;
grpc_dualstack_mode dsmode;
grpc_tcp_listener* new_sp = nullptr;
const char* ifa_name = (ifa_it->ifa_name ? ifa_it->ifa_name : "<unknown>");
if (ifa_it->ifa_addr == nullptr) {
continue;
} else if (ifa_it->ifa_addr->sa_family == AF_INET) {
addr.len = static_cast<socklen_t>(sizeof(grpc_sockaddr_in));
} else if (ifa_it->ifa_addr->sa_family == AF_INET6) {
addr.len = static_cast<socklen_t>(sizeof(grpc_sockaddr_in6));
} else {
continue;
}
memcpy(addr.addr, ifa_it->ifa_addr, addr.len);
if (!grpc_sockaddr_set_port(&addr, requested_port)) {
/* Should never happen, because we check sa_family above. */
err = GRPC_ERROR_CREATE_FROM_STATIC_STRING("Failed to set port");
break;
}
if (grpc_sockaddr_to_string(&addr_str, &addr, 0) < 0) {
addr_str = gpr_strdup("<error>");
}
gpr_log(GPR_DEBUG,
"Adding local addr from interface %s flags 0x%x to server: %s",
ifa_name, ifa_it->ifa_flags, addr_str);
/* We could have multiple interfaces with the same address (e.g., bonding),
so look for duplicates. */
if (find_listener_with_addr(s, &addr) != nullptr) {
gpr_log(GPR_DEBUG, "Skipping duplicate addr %s on interface %s", addr_str,
ifa_name);
gpr_free(addr_str);
continue;
}
if ((err = grpc_tcp_server_add_addr(s, &addr, port_index, fd_index, &dsmode,
&new_sp)) != GRPC_ERROR_NONE) {
char* err_str = nullptr;
grpc_error* root_err;
if (gpr_asprintf(&err_str, "Failed to add listener: %s", addr_str) < 0) {
err_str = gpr_strdup("Failed to add listener");
}
root_err = GRPC_ERROR_CREATE_FROM_COPIED_STRING(err_str);
gpr_free(err_str);
gpr_free(addr_str);
err = grpc_error_add_child(root_err, err);
break;
} else {
GPR_ASSERT(requested_port == new_sp->port);
++fd_index;
if (sp != nullptr) {
new_sp->is_sibling = 1;
sp->sibling = new_sp;
}
sp = new_sp;
}
gpr_free(addr_str);
}
freeifaddrs(ifa);
if (err != GRPC_ERROR_NONE) {
return err;
} else if (sp == nullptr) {
return GRPC_ERROR_CREATE_FROM_STATIC_STRING("No local addresses");
} else {
*out_port = sp->port;
return GRPC_ERROR_NONE;
}
}
bool grpc_tcp_server_have_ifaddrs(void) { return true; }
#endif /* GRPC_HAVE_IFADDRS */
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