/* | |
* TCP/IP or UDP/IP networking functions | |
* | |
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved | |
* SPDX-License-Identifier: Apache-2.0 | |
* | |
* 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. | |
* | |
* This file is part of mbed TLS (https://tls.mbed.org) | |
*/ | |
/* 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. */ | |
#define _POSIX_C_SOURCE 200112L | |
#if !defined(MBEDTLS_CONFIG_FILE) | |
#include "mbedtls/config.h" | |
#else | |
#include MBEDTLS_CONFIG_FILE | |
#endif | |
#if defined(MBEDTLS_NET_C) | |
#if !defined(unix) && !defined(__unix__) && !defined(__unix) && \ | |
!defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__) && \ | |
!defined(__HAIKU__) | |
#error "This module only works on Unix and Windows, see MBEDTLS_NET_C in config.h" | |
#endif | |
#if defined(MBEDTLS_PLATFORM_C) | |
#include "mbedtls/platform.h" | |
#else | |
#include <stdlib.h> | |
#endif | |
#include "mbedtls/net_sockets.h" | |
#include <string.h> | |
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \ | |
!defined(EFI32) | |
#define IS_EINTR( ret ) ( ( ret ) == WSAEINTR ) | |
#if !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0501) | |
#undef _WIN32_WINNT | |
/* Enables getaddrinfo() & Co */ | |
#define _WIN32_WINNT 0x0501 | |
#endif | |
#include <ws2tcpip.h> | |
#include <winsock2.h> | |
#include <windows.h> | |
#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 ) | |
#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> | |
#include <time.h> | |
#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 ); | |
} | |
/* | |
* 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; | |
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 non-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 *ip_len ) | |
{ | |
int ret; | |
int type; | |
struct sockaddr_storage client_addr; | |
#if defined(__socklen_t_defined) || defined(_SOCKLEN_T) || \ | |
defined(_SOCKLEN_T_DECLARED) || defined(__DEFINED_socklen_t) | |
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; | |
*ip_len = sizeof( addr4->sin_addr.s_addr ); | |
if( buf_size < *ip_len ) | |
return( MBEDTLS_ERR_NET_BUFFER_TOO_SMALL ); | |
memcpy( client_ip, &addr4->sin_addr.s_addr, *ip_len ); | |
} | |
else | |
{ | |
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &client_addr; | |
*ip_len = sizeof( addr6->sin6_addr.s6_addr ); | |
if( buf_size < *ip_len ) | |
return( MBEDTLS_ERR_NET_BUFFER_TOO_SMALL ); | |
memcpy( client_ip, &addr6->sin6_addr.s6_addr, *ip_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; | |
struct timeval tv; | |
fd_set read_fds; | |
fd_set write_fds; | |
int fd = ctx->fd; | |
if( fd < 0 ) | |
return( MBEDTLS_ERR_NET_INVALID_CONTEXT ); | |
#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( fd, &read_fds ); | |
} | |
FD_ZERO( &write_fds ); | |
if( rw & MBEDTLS_NET_POLL_WRITE ) | |
{ | |
rw &= ~MBEDTLS_NET_POLL_WRITE; | |
FD_SET( 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; | |
int fd = ((mbedtls_net_context *) ctx)->fd; | |
if( fd < 0 ) | |
return( MBEDTLS_ERR_NET_INVALID_CONTEXT ); | |
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; | |
struct timeval tv; | |
fd_set read_fds; | |
int fd = ((mbedtls_net_context *) ctx)->fd; | |
if( fd < 0 ) | |
return( MBEDTLS_ERR_NET_INVALID_CONTEXT ); | |
FD_ZERO( &read_fds ); | |
FD_SET( 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; | |
int fd = ((mbedtls_net_context *) ctx)->fd; | |
if( fd < 0 ) | |
return( MBEDTLS_ERR_NET_INVALID_CONTEXT ); | |
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 ); | |
} | |
/* | |
* 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 */ |