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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/support/port_platform.h>
#ifdef GPR_POSIX_SOCKET
#include "src/core/iomgr/socket_utils_posix.h"
#include <arpa/inet.h>
#include <limits.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "src/core/iomgr/sockaddr_utils.h"
#include "src/core/support/string.h"
#include <grpc/support/host_port.h>
#include <grpc/support/log.h>
#include <grpc/support/port_platform.h>
#include <grpc/support/sync.h>
/* set a socket to non blocking mode */
int grpc_set_socket_nonblocking(int fd, int non_blocking) {
int oldflags = fcntl(fd, F_GETFL, 0);
if (oldflags < 0) {
return 0;
}
if (non_blocking) {
oldflags |= O_NONBLOCK;
} else {
oldflags &= ~O_NONBLOCK;
}
if (fcntl(fd, F_SETFL, oldflags) != 0) {
return 0;
}
return 1;
}
/* set a socket to close on exec */
int grpc_set_socket_cloexec(int fd, int close_on_exec) {
int oldflags = fcntl(fd, F_GETFD, 0);
if (oldflags < 0) {
return 0;
}
if (close_on_exec) {
oldflags |= FD_CLOEXEC;
} else {
oldflags &= ~FD_CLOEXEC;
}
if (fcntl(fd, F_SETFD, oldflags) != 0) {
return 0;
}
return 1;
}
/* set a socket to reuse old addresses */
int grpc_set_socket_reuse_addr(int fd, int reuse) {
int val = (reuse != 0);
int newval;
socklen_t intlen = sizeof(newval);
return 0 == setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) &&
0 == getsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &newval, &intlen) &&
(newval != 0) == val;
}
/* disable nagle */
int grpc_set_socket_low_latency(int fd, int low_latency) {
int val = (low_latency != 0);
int newval;
socklen_t intlen = sizeof(newval);
return 0 == setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)) &&
0 == getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &newval, &intlen) &&
(newval != 0) == val;
}
static gpr_once g_probe_ipv6_once = GPR_ONCE_INIT;
static int g_ipv6_loopback_available;
static void probe_ipv6_once(void) {
int fd = socket(AF_INET6, SOCK_STREAM, 0);
g_ipv6_loopback_available = 0;
if (fd < 0) {
gpr_log(GPR_INFO, "Disabling AF_INET6 sockets because socket() failed.");
} else {
struct sockaddr_in6 addr;
memset(&addr, 0, sizeof(addr));
addr.sin6_family = AF_INET6;
addr.sin6_addr.s6_addr[15] = 1; /* [::1]:0 */
if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) == 0) {
g_ipv6_loopback_available = 1;
} else {
gpr_log(GPR_INFO,
"Disabling AF_INET6 sockets because ::1 is not available.");
}
close(fd);
}
}
int grpc_ipv6_loopback_available(void) {
gpr_once_init(&g_probe_ipv6_once, probe_ipv6_once);
return g_ipv6_loopback_available;
}
/* This should be 0 in production, but it may be enabled for testing or
debugging purposes, to simulate an environment where IPv6 sockets can't
also speak IPv4. */
int grpc_forbid_dualstack_sockets_for_testing = 0;
static int set_socket_dualstack(int fd) {
if (!grpc_forbid_dualstack_sockets_for_testing) {
const int off = 0;
return 0 == setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &off, sizeof(off));
} else {
/* Force an IPv6-only socket, for testing purposes. */
const int on = 1;
setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on));
return 0;
}
}
int grpc_create_dualstack_socket(const struct sockaddr *addr, int type,
int protocol, grpc_dualstack_mode *dsmode) {
int family = addr->sa_family;
if (family == AF_INET6) {
int fd;
if (grpc_ipv6_loopback_available()) {
fd = socket(family, type, protocol);
} else {
fd = -1;
errno = EAFNOSUPPORT;
}
/* Check if we've got a valid dualstack socket. */
if (fd >= 0 && set_socket_dualstack(fd)) {
*dsmode = GRPC_DSMODE_DUALSTACK;
return fd;
}
/* If this isn't an IPv4 address, then return whatever we've got. */
if (!grpc_sockaddr_is_v4mapped(addr, NULL)) {
*dsmode = GRPC_DSMODE_IPV6;
return fd;
}
/* Fall back to AF_INET. */
if (fd >= 0) {
close(fd);
}
family = AF_INET;
}
*dsmode = family == AF_INET ? GRPC_DSMODE_IPV4 : GRPC_DSMODE_NONE;
return socket(family, type, protocol);
}
#endif
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