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godot/thirdparty/mbedtls/library/net_sockets.c

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/*
* TCP/IP or UDP/IP networking functions
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
/* Enable definition of getaddrinfo() even when compiling with -std=c99. Must
* be set before config.h, which pulls in glibc's features.h indirectly.
* Harmless on other platforms. */
#ifndef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 200112L
#endif
#ifndef _XOPEN_SOURCE
#define _XOPEN_SOURCE 600 /* sockaddr_storage */
#endif
#include "common.h"
#if defined(MBEDTLS_NET_C)
#if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
!defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__) && \
!defined(__HAIKU__) && !defined(__midipix__)
#error "This module only works on Unix and Windows, see MBEDTLS_NET_C in config.h"
#endif
#include "mbedtls/platform.h"
#include "mbedtls/net_sockets.h"
#include "mbedtls/error.h"
#include <string.h>
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
!defined(EFI32)
#define IS_EINTR(ret) ((ret) == WSAEINTR)
#if !defined(_WIN32_WINNT)
/* Enables getaddrinfo() & Co */
#define _WIN32_WINNT 0x0501
#endif
#include <ws2tcpip.h>
#include <winsock2.h>
#include <windows.h>
#if (_WIN32_WINNT < 0x0501)
#include <wspiapi.h>
#endif
#if defined(_MSC_VER)
#if defined(_WIN32_WCE)
#pragma comment( lib, "ws2.lib" )
#else
#pragma comment( lib, "ws2_32.lib" )
#endif
#endif /* _MSC_VER */
#define read(fd, buf, len) recv(fd, (char *) (buf), (int) (len), 0)
#define write(fd, buf, len) send(fd, (char *) (buf), (int) (len), 0)
#define close(fd) closesocket(fd)
static int wsa_init_done = 0;
#else /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <netdb.h>
#include <errno.h>
#define IS_EINTR(ret) ((ret) == EINTR)
#define SOCKET int
#endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
/* Some MS functions want int and MSVC warns if we pass size_t,
* but the standard functions use socklen_t, so cast only for MSVC */
#if defined(_MSC_VER)
#define MSVC_INT_CAST (int)
#else
#define MSVC_INT_CAST
#endif
#include <stdio.h>
#if defined(MBEDTLS_HAVE_TIME)
#include <time.h>
#endif
#include <stdint.h>
/*
* Prepare for using the sockets interface
*/
static int net_prepare(void)
{
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
!defined(EFI32)
WSADATA wsaData;
if (wsa_init_done == 0) {
if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0) {
return MBEDTLS_ERR_NET_SOCKET_FAILED;
}
wsa_init_done = 1;
}
#else
#if !defined(EFIX64) && !defined(EFI32)
signal(SIGPIPE, SIG_IGN);
#endif
#endif
return 0;
}
/*
* Return 0 if the file descriptor is valid, an error otherwise.
* If for_select != 0, check whether the file descriptor is within the range
* allowed for fd_set used for the FD_xxx macros and the select() function.
*/
static int check_fd(int fd, int for_select)
{
if (fd < 0) {
return MBEDTLS_ERR_NET_INVALID_CONTEXT;
}
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
!defined(EFI32)
(void) for_select;
#else
/* A limitation of select() is that it only works with file descriptors
* that are strictly less than FD_SETSIZE. This is a limitation of the
* fd_set type. Error out early, because attempting to call FD_SET on a
* large file descriptor is a buffer overflow on typical platforms. */
if (for_select && fd >= FD_SETSIZE) {
return MBEDTLS_ERR_NET_POLL_FAILED;
}
#endif
return 0;
}
/*
* Initialize a context
*/
void mbedtls_net_init(mbedtls_net_context *ctx)
{
ctx->fd = -1;
}
/*
* Initiate a TCP connection with host:port and the given protocol
*/
int mbedtls_net_connect(mbedtls_net_context *ctx, const char *host,
const char *port, int proto)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
struct addrinfo hints, *addr_list, *cur;
if ((ret = net_prepare()) != 0) {
return ret;
}
/* Do name resolution with both IPv6 and IPv4 */
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
if (getaddrinfo(host, port, &hints, &addr_list) != 0) {
return MBEDTLS_ERR_NET_UNKNOWN_HOST;
}
/* Try the sockaddrs until a connection succeeds */
ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
for (cur = addr_list; cur != NULL; cur = cur->ai_next) {
ctx->fd = (int) socket(cur->ai_family, cur->ai_socktype,
cur->ai_protocol);
if (ctx->fd < 0) {
ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
continue;
}
if (connect(ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen) == 0) {
ret = 0;
break;
}
close(ctx->fd);
ret = MBEDTLS_ERR_NET_CONNECT_FAILED;
}
freeaddrinfo(addr_list);
return ret;
}
/*
* Create a listening socket on bind_ip:port
*/
int mbedtls_net_bind(mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto)
{
int n, ret;
struct addrinfo hints, *addr_list, *cur;
if ((ret = net_prepare()) != 0) {
return ret;
}
/* Bind to IPv6 and/or IPv4, but only in the desired protocol */
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
if (bind_ip == NULL) {
hints.ai_flags = AI_PASSIVE;
}
if (getaddrinfo(bind_ip, port, &hints, &addr_list) != 0) {
return MBEDTLS_ERR_NET_UNKNOWN_HOST;
}
/* Try the sockaddrs until a binding succeeds */
ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
for (cur = addr_list; cur != NULL; cur = cur->ai_next) {
ctx->fd = (int) socket(cur->ai_family, cur->ai_socktype,
cur->ai_protocol);
if (ctx->fd < 0) {
ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
continue;
}
n = 1;
if (setsockopt(ctx->fd, SOL_SOCKET, SO_REUSEADDR,
(const char *) &n, sizeof(n)) != 0) {
close(ctx->fd);
ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
continue;
}
if (bind(ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen) != 0) {
close(ctx->fd);
ret = MBEDTLS_ERR_NET_BIND_FAILED;
continue;
}
/* Listen only makes sense for TCP */
if (proto == MBEDTLS_NET_PROTO_TCP) {
if (listen(ctx->fd, MBEDTLS_NET_LISTEN_BACKLOG) != 0) {
close(ctx->fd);
ret = MBEDTLS_ERR_NET_LISTEN_FAILED;
continue;
}
}
/* Bind was successful */
ret = 0;
break;
}
freeaddrinfo(addr_list);
return ret;
}
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
!defined(EFI32)
/*
* Check if the requested operation would be blocking on a non-blocking socket
* and thus 'failed' with a negative return value.
*/
static int net_would_block(const mbedtls_net_context *ctx)
{
((void) ctx);
return WSAGetLastError() == WSAEWOULDBLOCK;
}
#else
/*
* Check if the requested operation would be blocking on a non-blocking socket
* and thus 'failed' with a negative return value.
*
* Note: on a blocking socket this function always returns 0!
*/
static int net_would_block(const mbedtls_net_context *ctx)
{
int err = errno;
/*
* Never return 'WOULD BLOCK' on a blocking socket
*/
if ((fcntl(ctx->fd, F_GETFL) & O_NONBLOCK) != O_NONBLOCK) {
errno = err;
return 0;
}
switch (errno = err) {
#if defined EAGAIN
case EAGAIN:
#endif
#if defined EWOULDBLOCK && EWOULDBLOCK != EAGAIN
case EWOULDBLOCK:
#endif
return 1;
}
return 0;
}
#endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
/*
* Accept a connection from a remote client
*/
int mbedtls_net_accept(mbedtls_net_context *bind_ctx,
mbedtls_net_context *client_ctx,
void *client_ip, size_t buf_size, size_t *cip_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
int type;
struct sockaddr_storage client_addr;
#if defined(__socklen_t_defined) || defined(_SOCKLEN_T) || \
defined(_SOCKLEN_T_DECLARED) || defined(__DEFINED_socklen_t) || \
defined(socklen_t) || (defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L)
socklen_t n = (socklen_t) sizeof(client_addr);
socklen_t type_len = (socklen_t) sizeof(type);
#else
int n = (int) sizeof(client_addr);
int type_len = (int) sizeof(type);
#endif
/* Is this a TCP or UDP socket? */
if (getsockopt(bind_ctx->fd, SOL_SOCKET, SO_TYPE,
(void *) &type, &type_len) != 0 ||
(type != SOCK_STREAM && type != SOCK_DGRAM)) {
return MBEDTLS_ERR_NET_ACCEPT_FAILED;
}
if (type == SOCK_STREAM) {
/* TCP: actual accept() */
ret = client_ctx->fd = (int) accept(bind_ctx->fd,
(struct sockaddr *) &client_addr, &n);
} else {
/* UDP: wait for a message, but keep it in the queue */
char buf[1] = { 0 };
ret = (int) recvfrom(bind_ctx->fd, buf, sizeof(buf), MSG_PEEK,
(struct sockaddr *) &client_addr, &n);
#if defined(_WIN32)
if (ret == SOCKET_ERROR &&
WSAGetLastError() == WSAEMSGSIZE) {
/* We know buf is too small, thanks, just peeking here */
ret = 0;
}
#endif
}
if (ret < 0) {
if (net_would_block(bind_ctx) != 0) {
return MBEDTLS_ERR_SSL_WANT_READ;
}
return MBEDTLS_ERR_NET_ACCEPT_FAILED;
}
/* UDP: hijack the listening socket to communicate with the client,
* then bind a new socket to accept new connections */
if (type != SOCK_STREAM) {
struct sockaddr_storage local_addr;
int one = 1;
if (connect(bind_ctx->fd, (struct sockaddr *) &client_addr, n) != 0) {
return MBEDTLS_ERR_NET_ACCEPT_FAILED;
}
client_ctx->fd = bind_ctx->fd;
bind_ctx->fd = -1; /* In case we exit early */
n = sizeof(struct sockaddr_storage);
if (getsockname(client_ctx->fd,
(struct sockaddr *) &local_addr, &n) != 0 ||
(bind_ctx->fd = (int) socket(local_addr.ss_family,
SOCK_DGRAM, IPPROTO_UDP)) < 0 ||
setsockopt(bind_ctx->fd, SOL_SOCKET, SO_REUSEADDR,
(const char *) &one, sizeof(one)) != 0) {
return MBEDTLS_ERR_NET_SOCKET_FAILED;
}
if (bind(bind_ctx->fd, (struct sockaddr *) &local_addr, n) != 0) {
return MBEDTLS_ERR_NET_BIND_FAILED;
}
}
if (client_ip != NULL) {
if (client_addr.ss_family == AF_INET) {
struct sockaddr_in *addr4 = (struct sockaddr_in *) &client_addr;
*cip_len = sizeof(addr4->sin_addr.s_addr);
if (buf_size < *cip_len) {
return MBEDTLS_ERR_NET_BUFFER_TOO_SMALL;
}
memcpy(client_ip, &addr4->sin_addr.s_addr, *cip_len);
} else {
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &client_addr;
*cip_len = sizeof(addr6->sin6_addr.s6_addr);
if (buf_size < *cip_len) {
return MBEDTLS_ERR_NET_BUFFER_TOO_SMALL;
}
memcpy(client_ip, &addr6->sin6_addr.s6_addr, *cip_len);
}
}
return 0;
}
/*
* Set the socket blocking or non-blocking
*/
int mbedtls_net_set_block(mbedtls_net_context *ctx)
{
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
!defined(EFI32)
u_long n = 0;
return ioctlsocket(ctx->fd, FIONBIO, &n);
#else
return fcntl(ctx->fd, F_SETFL, fcntl(ctx->fd, F_GETFL) & ~O_NONBLOCK);
#endif
}
int mbedtls_net_set_nonblock(mbedtls_net_context *ctx)
{
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
!defined(EFI32)
u_long n = 1;
return ioctlsocket(ctx->fd, FIONBIO, &n);
#else
return fcntl(ctx->fd, F_SETFL, fcntl(ctx->fd, F_GETFL) | O_NONBLOCK);
#endif
}
/*
* Check if data is available on the socket
*/
int mbedtls_net_poll(mbedtls_net_context *ctx, uint32_t rw, uint32_t timeout)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
struct timeval tv;
fd_set read_fds;
fd_set write_fds;
int fd = ctx->fd;
ret = check_fd(fd, 1);
if (ret != 0) {
return ret;
}
#if defined(__has_feature)
#if __has_feature(memory_sanitizer)
/* Ensure that memory sanitizers consider read_fds and write_fds as
* initialized even on platforms such as Glibc/x86_64 where FD_ZERO
* is implemented in assembly. */
memset(&read_fds, 0, sizeof(read_fds));
memset(&write_fds, 0, sizeof(write_fds));
#endif
#endif
FD_ZERO(&read_fds);
if (rw & MBEDTLS_NET_POLL_READ) {
rw &= ~MBEDTLS_NET_POLL_READ;
FD_SET((SOCKET) fd, &read_fds);
}
FD_ZERO(&write_fds);
if (rw & MBEDTLS_NET_POLL_WRITE) {
rw &= ~MBEDTLS_NET_POLL_WRITE;
FD_SET((SOCKET) fd, &write_fds);
}
if (rw != 0) {
return MBEDTLS_ERR_NET_BAD_INPUT_DATA;
}
tv.tv_sec = timeout / 1000;
tv.tv_usec = (timeout % 1000) * 1000;
do {
ret = select(fd + 1, &read_fds, &write_fds, NULL,
timeout == (uint32_t) -1 ? NULL : &tv);
} while (IS_EINTR(ret));
if (ret < 0) {
return MBEDTLS_ERR_NET_POLL_FAILED;
}
ret = 0;
if (FD_ISSET(fd, &read_fds)) {
ret |= MBEDTLS_NET_POLL_READ;
}
if (FD_ISSET(fd, &write_fds)) {
ret |= MBEDTLS_NET_POLL_WRITE;
}
return ret;
}
/*
* Portable usleep helper
*/
void mbedtls_net_usleep(unsigned long usec)
{
#if defined(_WIN32)
Sleep((usec + 999) / 1000);
#else
struct timeval tv;
tv.tv_sec = usec / 1000000;
#if defined(__unix__) || defined(__unix) || \
(defined(__APPLE__) && defined(__MACH__))
tv.tv_usec = (suseconds_t) usec % 1000000;
#else
tv.tv_usec = usec % 1000000;
#endif
select(0, NULL, NULL, NULL, &tv);
#endif
}
/*
* Read at most 'len' characters
*/
int mbedtls_net_recv(void *ctx, unsigned char *buf, size_t len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
int fd = ((mbedtls_net_context *) ctx)->fd;
ret = check_fd(fd, 0);
if (ret != 0) {
return ret;
}
ret = (int) read(fd, buf, len);
if (ret < 0) {
if (net_would_block(ctx) != 0) {
return MBEDTLS_ERR_SSL_WANT_READ;
}
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
!defined(EFI32)
if (WSAGetLastError() == WSAECONNRESET) {
return MBEDTLS_ERR_NET_CONN_RESET;
}
#else
if (errno == EPIPE || errno == ECONNRESET) {
return MBEDTLS_ERR_NET_CONN_RESET;
}
if (errno == EINTR) {
return MBEDTLS_ERR_SSL_WANT_READ;
}
#endif
return MBEDTLS_ERR_NET_RECV_FAILED;
}
return ret;
}
/*
* Read at most 'len' characters, blocking for at most 'timeout' ms
*/
int mbedtls_net_recv_timeout(void *ctx, unsigned char *buf,
size_t len, uint32_t timeout)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
struct timeval tv;
fd_set read_fds;
int fd = ((mbedtls_net_context *) ctx)->fd;
ret = check_fd(fd, 1);
if (ret != 0) {
return ret;
}
FD_ZERO(&read_fds);
FD_SET((SOCKET) fd, &read_fds);
tv.tv_sec = timeout / 1000;
tv.tv_usec = (timeout % 1000) * 1000;
ret = select(fd + 1, &read_fds, NULL, NULL, timeout == 0 ? NULL : &tv);
/* Zero fds ready means we timed out */
if (ret == 0) {
return MBEDTLS_ERR_SSL_TIMEOUT;
}
if (ret < 0) {
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
!defined(EFI32)
if (WSAGetLastError() == WSAEINTR) {
return MBEDTLS_ERR_SSL_WANT_READ;
}
#else
if (errno == EINTR) {
return MBEDTLS_ERR_SSL_WANT_READ;
}
#endif
return MBEDTLS_ERR_NET_RECV_FAILED;
}
/* This call will not block */
return mbedtls_net_recv(ctx, buf, len);
}
/*
* Write at most 'len' characters
*/
int mbedtls_net_send(void *ctx, const unsigned char *buf, size_t len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
int fd = ((mbedtls_net_context *) ctx)->fd;
ret = check_fd(fd, 0);
if (ret != 0) {
return ret;
}
ret = (int) write(fd, buf, len);
if (ret < 0) {
if (net_would_block(ctx) != 0) {
return MBEDTLS_ERR_SSL_WANT_WRITE;
}
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
!defined(EFI32)
if (WSAGetLastError() == WSAECONNRESET) {
return MBEDTLS_ERR_NET_CONN_RESET;
}
#else
if (errno == EPIPE || errno == ECONNRESET) {
return MBEDTLS_ERR_NET_CONN_RESET;
}
if (errno == EINTR) {
return MBEDTLS_ERR_SSL_WANT_WRITE;
}
#endif
return MBEDTLS_ERR_NET_SEND_FAILED;
}
return ret;
}
/*
* Close the connection
*/
void mbedtls_net_close(mbedtls_net_context *ctx)
{
if (ctx->fd == -1) {
return;
}
close(ctx->fd);
ctx->fd = -1;
}
/*
* Gracefully close the connection
*/
void mbedtls_net_free(mbedtls_net_context *ctx)
{
if (ctx->fd == -1) {
return;
}
shutdown(ctx->fd, 2);
close(ctx->fd);
ctx->fd = -1;
}
#endif /* MBEDTLS_NET_C */
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