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/*
* TCP/IP or UDP/IP networking functions
* modified for LWIP support on ESP32
*
* SPDX-FileCopyrightText: The Mbed TLS Contributors
*
* SPDX-License-Identifier: Apache-2.0
*
* SPDX-FileContributor: 2015 Angus Gratton
*/
#include <mbedtls/build_info.h>
#if !defined(MBEDTLS_NET_C)
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdlib.h>
#define mbedtls_calloc calloc
#define mbedtls_free free
#define mbedtls_time time
#define mbedtls_time_t time_t
#endif
#include "mbedtls/net_sockets.h"
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <netdb.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <stdint.h>
#include <fcntl.h>
#include <errno.h>
/*
* Prepare for using the sockets interface
*/
static int net_prepare( void )
{
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 ) {
int fd = socket( cur->ai_family, cur->ai_socktype, cur->ai_protocol );
if ( fd < 0 ) {
ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
continue;
}
if ( connect( fd, cur->ai_addr, cur->ai_addrlen ) == 0 ) {
ctx->fd = fd; // connected!
ret = 0;
break;
}
close( 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 ret;
struct addrinfo hints, *addr_list, *cur;
struct sockaddr_storage *serv_addr = NULL;
#if SO_REUSE
int n = 1;
#endif
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 ( 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 ) {
int fd = socket( cur->ai_family, cur->ai_socktype, cur->ai_protocol );
if ( fd < 0 ) {
ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
continue;
}
/*SO_REUSEADDR option dafault is disable in source code(lwip)*/
#if SO_REUSE
if ( setsockopt( fd, SOL_SOCKET, SO_REUSEADDR,
(const char *) &n, sizeof( n ) ) != 0 ) {
close( fd );
ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
continue;
}
#endif
serv_addr = (struct sockaddr_storage *) cur->ai_addr;
#if CONFIG_LWIP_IPV4
if (cur->ai_family == AF_INET) {
/*bind interface dafault don't process the addr is 0xffffffff for TCP Protocol*/
struct sockaddr_in *p = (struct sockaddr_in *)serv_addr;
p->sin_addr.s_addr = htonl(INADDR_ANY); /* Any incoming interface */
}
#endif // CONFIG_LWIP_IPV4
#if CONFIG_LWIP_IPV6
if (cur->ai_family == AF_INET6) {
struct sockaddr_in6 *p = (struct sockaddr_in6 *) serv_addr;
struct in6_addr inaddr_any = IN6ADDR_ANY_INIT;
p->sin6_addr = inaddr_any;
}
#endif // CONFIG_LWIP_IPV6
if ( bind( fd, (struct sockaddr *)serv_addr, cur->ai_addrlen ) != 0 ) {
close( fd );
ret = MBEDTLS_ERR_NET_BIND_FAILED;
continue;
}
/* Listen only makes sense for TCP */
if ( proto == MBEDTLS_NET_PROTO_TCP ) {
if ( listen( fd, MBEDTLS_NET_LISTEN_BACKLOG ) != 0 ) {
close( fd );
ret = MBEDTLS_ERR_NET_LISTEN_FAILED;
continue;
}
}
/* I we ever get there, it's a success */
ctx->fd = fd;
ret = 0;
break;
}
freeaddrinfo( addr_list );
return ( ret );
}
/*
* 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 error = errno;
switch ( errno = error ) {
#if defined EAGAIN
case EAGAIN:
#endif
#if defined EWOULDBLOCK && EWOULDBLOCK != EAGAIN
case EWOULDBLOCK:
#endif
return ( 1 );
}
return ( 0 );
}
/*
* 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;
socklen_t n = (socklen_t) sizeof( client_addr );
socklen_t type_len = (socklen_t) sizeof( type );
/* Is this a TCP or UDP socket? */
if ( getsockopt( bind_ctx->fd, SOL_SOCKET, SO_TYPE,
(void *) &type, (socklen_t *) &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 = recvfrom( bind_ctx->fd, buf, sizeof( buf ), MSG_PEEK,
(struct sockaddr *) &client_addr, &n );
}
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 ) {
#ifdef CONFIG_LWIP_IPV4
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 );
}
#endif // CONFIG_LWIP_IPV4
#ifdef CONFIG_LWIP_IPV6
if( client_addr.ss_family == AF_INET6 )
{
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);
}
#endif // CONFIG_LWIP_IPV6
}
return ( 0 );
}
/*
* Set the socket blocking or non-blocking
*/
int mbedtls_net_set_block( mbedtls_net_context *ctx )
{
return ( fcntl( ctx->fd, F_SETFL, fcntl( ctx->fd, F_GETFL, 0 ) & ~O_NONBLOCK ) );
}
int mbedtls_net_set_nonblock( mbedtls_net_context *ctx )
{
return ( fcntl( ctx->fd, F_SETFL, fcntl( ctx->fd, F_GETFL, 0 ) | O_NONBLOCK ) );
}
/*
* Portable usleep helper
*/
void mbedtls_net_usleep( unsigned long usec )
{
struct timeval tv;
tv.tv_sec = usec / 1000000;
tv.tv_usec = usec % 1000000;
select( 0, NULL, NULL, NULL, &tv );
}
/*
* 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 ( errno == EPIPE || errno == ECONNRESET ) {
return ( MBEDTLS_ERR_NET_CONN_RESET );
}
if ( errno == EINTR ) {
return ( MBEDTLS_ERR_SSL_WANT_READ );
}
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 ( errno == EINTR ) {
return ( MBEDTLS_ERR_SSL_WANT_READ );
}
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 ( errno == EPIPE || errno == ECONNRESET ) {
return ( MBEDTLS_ERR_NET_CONN_RESET );
}
if ( errno == EINTR ) {
return ( MBEDTLS_ERR_SSL_WANT_WRITE );
}
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 */
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