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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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 "utils/s2n_socket.h"
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/socket.h>
#include <unistd.h>
#include "tls/s2n_connection.h"
#include "utils/s2n_safety.h"
#if TCP_CORK
#define S2N_CORK TCP_CORK
#define S2N_CORK_ON 1
#define S2N_CORK_OFF 0
#elif TCP_NOPUSH
#define S2N_CORK TCP_NOPUSH
#define S2N_CORK_ON 1
#define S2N_CORK_OFF 0
#elif TCP_NODELAY
#define S2N_CORK TCP_NODELAY
#define S2N_CORK_ON 0
#define S2N_CORK_OFF 1
#endif
int s2n_socket_quickack(struct s2n_connection *conn)
{
#ifdef TCP_QUICKACK
POSIX_ENSURE_REF(conn);
if (!conn->managed_recv_io) {
return 0;
}
struct s2n_socket_read_io_context *r_io_ctx = (struct s2n_socket_read_io_context *) conn->recv_io_context;
POSIX_ENSURE_REF(r_io_ctx);
if (r_io_ctx->tcp_quickack_set) {
return 0;
}
/* Ignore the return value, if it fails it fails */
int optval = 1;
if (setsockopt(r_io_ctx->fd, IPPROTO_TCP, TCP_QUICKACK, &optval, sizeof(optval)) == 0) {
r_io_ctx->tcp_quickack_set = 1;
}
#endif
return 0;
}
int s2n_socket_write_snapshot(struct s2n_connection *conn)
{
#ifdef S2N_CORK
socklen_t corklen = sizeof(int);
POSIX_ENSURE_REF(conn);
struct s2n_socket_write_io_context *w_io_ctx = (struct s2n_socket_write_io_context *) conn->send_io_context;
POSIX_ENSURE_REF(w_io_ctx);
getsockopt(w_io_ctx->fd, IPPROTO_TCP, S2N_CORK, &w_io_ctx->original_cork_val, &corklen);
POSIX_ENSURE_EQ(corklen, sizeof(int));
w_io_ctx->original_cork_is_set = 1;
#endif
return 0;
}
int s2n_socket_read_snapshot(struct s2n_connection *conn)
{
#ifdef SO_RCVLOWAT
socklen_t watlen = sizeof(int);
POSIX_ENSURE_REF(conn);
struct s2n_socket_read_io_context *r_io_ctx = (struct s2n_socket_read_io_context *) conn->recv_io_context;
POSIX_ENSURE_REF(r_io_ctx);
getsockopt(r_io_ctx->fd, SOL_SOCKET, SO_RCVLOWAT, &r_io_ctx->original_rcvlowat_val, &watlen);
POSIX_ENSURE_EQ(watlen, sizeof(int));
r_io_ctx->original_rcvlowat_is_set = 1;
#endif
return 0;
}
int s2n_socket_write_restore(struct s2n_connection *conn)
{
#ifdef S2N_CORK
POSIX_ENSURE_REF(conn);
struct s2n_socket_write_io_context *w_io_ctx = (struct s2n_socket_write_io_context *) conn->send_io_context;
POSIX_ENSURE_REF(w_io_ctx);
if (!w_io_ctx->original_cork_is_set) {
return 0;
}
setsockopt(w_io_ctx->fd, IPPROTO_TCP, S2N_CORK, &w_io_ctx->original_cork_val, sizeof(w_io_ctx->original_cork_val));
w_io_ctx->original_cork_is_set = 0;
#endif
return 0;
}
int s2n_socket_read_restore(struct s2n_connection *conn)
{
#ifdef SO_RCVLOWAT
POSIX_ENSURE_REF(conn);
struct s2n_socket_read_io_context *r_io_ctx = (struct s2n_socket_read_io_context *) conn->recv_io_context;
POSIX_ENSURE_REF(r_io_ctx);
if (!r_io_ctx->original_rcvlowat_is_set) {
return 0;
}
setsockopt(r_io_ctx->fd, SOL_SOCKET, SO_RCVLOWAT, &r_io_ctx->original_rcvlowat_val, sizeof(r_io_ctx->original_rcvlowat_val));
r_io_ctx->original_rcvlowat_is_set = 0;
#endif
return 0;
}
int s2n_socket_was_corked(struct s2n_connection *conn)
{
POSIX_ENSURE_REF(conn);
/* If we're not using custom I/O and a send fd has not been set yet, return false*/
if (!conn->managed_send_io || !conn->send) {
return 0;
}
struct s2n_socket_write_io_context *io_ctx = (struct s2n_socket_write_io_context *) conn->send_io_context;
POSIX_ENSURE_REF(io_ctx);
return io_ctx->original_cork_val;
}
int s2n_socket_write_cork(struct s2n_connection *conn)
{
#ifdef S2N_CORK
POSIX_ENSURE_REF(conn);
int optval = S2N_CORK_ON;
struct s2n_socket_write_io_context *w_io_ctx = (struct s2n_socket_write_io_context *) conn->send_io_context;
POSIX_ENSURE_REF(w_io_ctx);
/* Ignore the return value, if it fails it fails */
setsockopt(w_io_ctx->fd, IPPROTO_TCP, S2N_CORK, &optval, sizeof(optval));
#endif
return 0;
}
int s2n_socket_write_uncork(struct s2n_connection *conn)
{
#ifdef S2N_CORK
POSIX_ENSURE_REF(conn);
int optval = S2N_CORK_OFF;
struct s2n_socket_write_io_context *w_io_ctx = (struct s2n_socket_write_io_context *) conn->send_io_context;
POSIX_ENSURE_REF(w_io_ctx);
/* Ignore the return value, if it fails it fails */
setsockopt(w_io_ctx->fd, IPPROTO_TCP, S2N_CORK, &optval, sizeof(optval));
#endif
return 0;
}
int s2n_socket_set_read_size(struct s2n_connection *conn, int size)
{
#ifdef SO_RCVLOWAT
POSIX_ENSURE_REF(conn);
struct s2n_socket_read_io_context *r_io_ctx = (struct s2n_socket_read_io_context *) conn->recv_io_context;
POSIX_ENSURE_REF(r_io_ctx);
setsockopt(r_io_ctx->fd, SOL_SOCKET, SO_RCVLOWAT, &size, sizeof(size));
#endif
return 0;
}
int s2n_socket_read(void *io_context, uint8_t *buf, uint32_t len)
{
POSIX_ENSURE_REF(io_context);
POSIX_ENSURE_REF(buf);
int rfd = ((struct s2n_socket_read_io_context *) io_context)->fd;
if (rfd < 0) {
errno = EBADF;
POSIX_BAIL(S2N_ERR_BAD_FD);
}
/* Clear the quickack flag so we know to reset it */
((struct s2n_socket_read_io_context *) io_context)->tcp_quickack_set = 0;
/* On success, the number of bytes read is returned. On failure, -1 is
* returned and errno is set appropriately. */
ssize_t result = read(rfd, buf, len);
POSIX_ENSURE_INCLUSIVE_RANGE(INT_MIN, result, INT_MAX);
return result;
}
int s2n_socket_write(void *io_context, const uint8_t *buf, uint32_t len)
{
POSIX_ENSURE_REF(io_context);
POSIX_ENSURE_REF(buf);
int wfd = ((struct s2n_socket_write_io_context *) io_context)->fd;
if (wfd < 0) {
errno = EBADF;
POSIX_BAIL(S2N_ERR_BAD_FD);
}
/* On success, the number of bytes written is returned. On failure, -1 is
* returned and errno is set appropriately. */
ssize_t result = write(wfd, buf, len);
POSIX_ENSURE_INCLUSIVE_RANGE(INT_MIN, result, INT_MAX);
return result;
}
int s2n_socket_is_ipv6(int fd, uint8_t *ipv6)
{
POSIX_ENSURE_REF(ipv6);
socklen_t len;
struct sockaddr_storage addr;
len = sizeof(addr);
POSIX_GUARD(getpeername(fd, (struct sockaddr *) &addr, &len));
*ipv6 = 0;
if (AF_INET6 == addr.ss_family) {
*ipv6 = 1;
}
return 0;
}
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