init project

Signed-off-by: a1012112796 <1012112796@qq.com>

rt-thread/components/net/sal/Kconfig

@@ -0,0 +1,42 @@
+menuconfig RT_USING_SAL
+    bool "SAL: socket abstraction layer"
+    select RT_USING_NETDEV
+    select RT_USING_SYSTEM_WORKQUEUE
+    default n
+
+if RT_USING_SAL
+
+    config SAL_INTERNET_CHECK
+        bool "Enable the ability that check internet status"
+        default y
+        help
+            The ability that check internet status is provided by RT-Thread.
+
+    menu "Docking with protocol stacks"
+        config SAL_USING_LWIP
+            bool "Docking with lwIP stack"
+            default n
+
+        config SAL_USING_AT
+            bool "Docking with AT commands stack"
+            default n
+
+        config SAL_USING_TLS
+            bool "Docking with MbedTLS protocol"
+            default n
+    endmenu
+
+    config SAL_USING_POSIX
+        bool
+        depends on DFS_USING_POSIX
+        default y
+        help
+            Enable BSD socket operated by file system API
+            Let BSD socket operated by file system API, such as read/write and involveed in select/poll POSIX APIs.
+
+    config SAL_SOCKETS_NUM
+        int "the maximum number of sockets"
+        depends on !SAL_USING_POSIX
+        default 16
+
+endif

rt-thread/components/net/sal/SConscript

@@ -0,0 +1,35 @@
+# RT-Thread building script for component
+
+from building import *
+
+cwd = GetCurrentDir()
+
+src = Glob('src/*.c')
+src += ['socket/net_netdb.c']
+
+CPPPATH = [cwd + '/include']
+CPPPATH += [cwd + '/include/socket']
+
+if GetDepend('SAL_USING_LWIP') or GetDepend('SAL_USING_AT'):
+    CPPPATH += [cwd + '/impl']
+
+if GetDepend('SAL_USING_LWIP'):
+    src += ['impl/af_inet_lwip.c']
+
+if GetDepend('SAL_USING_AT'):
+    src += ['impl/af_inet_at.c']
+
+if GetDepend('SAL_USING_TLS'):
+    src += ['impl/proto_mbedtls.c']
+
+if GetDepend('SAL_USING_POSIX'):
+    CPPPATH += [cwd + '/include/dfs_net']
+    src += ['socket/net_sockets.c']
+    src += Glob('dfs_net/*.c')
+
+if not GetDepend('HAVE_SYS_SOCKET_H'):
+    CPPPATH += [cwd + '/include/socket/sys_socket']
+
+group = DefineGroup('SAL', src, depend = ['RT_USING_SAL'], CPPPATH = CPPPATH)
+
+Return('group')

rt-thread/components/net/sal/dfs_net/dfs_net.c

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2015-02-17     Bernard      First version
+ * 2016-05-07     Bernard      Rename dfs_lwip to dfs_net
+ * 2018-03-09     Bernard      Fix the last data issue in poll.
+ * 2018-05-24     ChenYong     Add socket abstraction layer
+ */
+
+#include <rtthread.h>
+
+#include <dfs.h>
+#include <dfs_net.h>
+
+#include <sys/socket.h>
+
+int dfs_net_getsocket(int fd)
+{
+    int socket;
+    struct dfs_fd *_dfs_fd;
+
+    _dfs_fd = fd_get(fd);
+    if (_dfs_fd == NULL) return -1;
+
+    if (_dfs_fd->type != FT_SOCKET) socket = -1;
+    else socket = (int)_dfs_fd->data;
+
+    fd_put(_dfs_fd); /* put this dfs fd */
+    return socket;
+}
+
+static int dfs_net_ioctl(struct dfs_fd* file, int cmd, void* args)
+{
+    int socket = (int) file->data;
+
+    return sal_ioctlsocket(socket, cmd, args);
+}
+
+static int dfs_net_read(struct dfs_fd* file, void *buf, size_t count)
+{
+    int socket = (int) file->data;
+
+    return sal_recvfrom(socket, buf, count, 0, NULL, NULL);
+}
+
+static int dfs_net_write(struct dfs_fd *file, const void *buf, size_t count)
+{
+    int socket = (int) file->data;
+
+    return sal_sendto(socket, buf, count, 0, NULL, 0);
+}
+
+static int dfs_net_close(struct dfs_fd* file)
+{
+    int socket = (int) file->data;
+
+    return sal_closesocket(socket);
+}
+
+static int dfs_net_poll(struct dfs_fd *file, struct rt_pollreq *req)
+{
+    extern int sal_poll(struct dfs_fd *file, struct rt_pollreq *req);
+
+    return sal_poll(file, req);
+}
+
+const struct dfs_file_ops _net_fops =
+{
+    NULL,    /* open     */
+    dfs_net_close,
+    dfs_net_ioctl,
+    dfs_net_read,
+    dfs_net_write,
+    NULL,
+    NULL,    /* lseek    */
+    NULL,    /* getdents */
+    dfs_net_poll,
+};
+
+const struct dfs_file_ops *dfs_net_get_fops(void)
+{
+    return &_net_fops;
+}

rt-thread/components/net/sal/impl/af_inet.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-08-25     ChenYong     First version
+ */
+
+#ifndef __AF_INET_H__
+#define __AF_INET_H__
+
+#include <rtthread.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef SAL_USING_LWIP
+
+/* Set lwIP network interface device protocol family information  */
+int sal_lwip_netdev_set_pf_info(struct netdev *netdev);
+
+#endif /* SAL_USING_LWIP */
+
+#ifdef SAL_USING_AT
+
+/* Set AT network interface device protocol family information */
+int sal_at_netdev_set_pf_info(struct netdev *netdev);
+
+#endif /* SAL_USING_AT */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __AF_INET_H__ */

rt-thread/components/net/sal/impl/af_inet_at.c

@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-06-06     ChenYong     First version
+ */
+
+#include <rtthread.h>
+
+#include <netdb.h>
+#include <sal_low_lvl.h>
+
+#include <at_socket.h>
+#include <af_inet.h>
+
+#include <netdev.h>
+
+#ifdef SAL_USING_POSIX
+#include <poll.h>
+#endif
+
+#ifdef SAL_USING_AT
+
+#ifdef SAL_USING_POSIX
+static int at_poll(struct dfs_fd *file, struct rt_pollreq *req)
+{
+    int mask = 0;
+    struct at_socket *sock;
+    struct sal_socket *sal_sock;
+
+    sal_sock = sal_get_socket((int) file->data);
+    if(!sal_sock)
+    {
+        return -1;
+    }
+
+    sock = at_get_socket((int)sal_sock->user_data);
+    if (sock != NULL)
+    {
+        rt_base_t level;
+
+        rt_poll_add(&sock->wait_head, req);
+
+        level = rt_hw_interrupt_disable();
+        if (sock->rcvevent)
+        {
+            mask |= POLLIN;
+        }
+        if (sock->sendevent)
+        {
+            mask |= POLLOUT;
+        }
+        if (sock->errevent)
+        {
+            mask |= POLLERR;
+        }
+        rt_hw_interrupt_enable(level);
+    }
+
+    return mask;
+}
+#endif
+
+static const struct sal_socket_ops at_socket_ops =
+{
+    at_socket,
+    at_closesocket,
+    at_bind,
+#ifdef AT_USING_SOCKET_SERVER
+    at_listen,
+#else
+    NULL,
+#endif
+    at_connect,
+#ifdef AT_USING_SOCKET_SERVER
+    at_accept,
+#else
+    NULL,
+#endif
+    at_sendto,
+    at_recvfrom,
+    at_getsockopt,
+    at_setsockopt,
+    at_shutdown,
+    NULL,
+    NULL,
+    NULL,
+#ifdef SAL_USING_POSIX
+    at_poll,
+#endif /* SAL_USING_POSIX */
+};
+
+static const struct sal_netdb_ops at_netdb_ops =
+{
+    at_gethostbyname,
+    NULL,
+    at_getaddrinfo,
+    at_freeaddrinfo,
+};
+
+static const struct sal_proto_family at_inet_family =
+{
+    AF_AT,
+    AF_INET,
+    &at_socket_ops,
+    &at_netdb_ops,
+};
+
+
+/* Set AT network interface device protocol family information */
+int sal_at_netdev_set_pf_info(struct netdev *netdev)
+{
+    RT_ASSERT(netdev);
+
+    netdev->sal_user_data = (void *) &at_inet_family;
+    return 0;
+}
+
+#endif /* SAL_USING_AT */

rt-thread/components/net/sal/impl/af_inet_lwip.c

@@ -0,0 +1,337 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-05-17     ChenYong     First version
+ */
+
+#include <rtthread.h>
+
+#include <lwip/sockets.h>
+#include <lwip/netdb.h>
+#include <lwip/api.h>
+#include <lwip/init.h>
+#include <lwip/netif.h>
+
+#ifdef SAL_USING_POSIX
+#include <poll.h>
+#endif
+
+#include <sal_low_lvl.h>
+#include <af_inet.h>
+
+#include <netdev.h>
+
+#if (LWIP_VERSION < 0x2000000) && NETDEV_IPV6
+#error "The lwIP version is not support IPV6, please disable netdev IPV6 configuration "
+#elif (LWIP_VERSION > 0x2000000) && (NETDEV_IPV6 != LWIP_IPV6)
+#error "IPV6 configuration error, Please check and synchronize netdev and lwip IPV6 configuration."
+#endif
+
+#if LWIP_VERSION < 0x2000000
+#define SELWAIT_T int
+#else
+#ifndef SELWAIT_T
+#define SELWAIT_T u8_t
+#endif
+#endif
+
+#ifdef SAL_USING_LWIP
+
+#ifdef SAL_USING_POSIX
+
+#if LWIP_VERSION >= 0x20100ff
+#include <lwip/priv/sockets_priv.h>
+#else /* LWIP_VERSION < 0x20100ff */
+/*
+ * Re-define lwip socket
+ *
+ * NOTE: please make sure the definitions same in lwip::net_socket.c
+ */
+struct lwip_sock {
+    /** sockets currently are built on netconns, each socket has one netconn */
+    struct netconn *conn;
+    /** data that was left from the previous read */
+    void *lastdata;
+    /** offset in the data that was left from the previous read */
+    u16_t lastoffset;
+    /** number of times data was received, set by event_callback(),
+     tested by the receive and select functions */
+    s16_t rcvevent;
+    /** number of times data was ACKed (free send buffer), set by event_callback(),
+     tested by select */
+    u16_t sendevent;
+    /** error happened for this socket, set by event_callback(), tested by select */
+    u16_t errevent;
+   /** last error that occurred on this socket */
+#if LWIP_VERSION < 0x2000000
+   int err;
+#else
+   u8_t err;
+#endif
+    /** counter of how many threads are waiting for this socket using select */
+    SELWAIT_T select_waiting;
+
+    rt_wqueue_t wait_head;
+};
+#endif /* LWIP_VERSION >= 0x20100ff */
+
+extern struct lwip_sock *lwip_tryget_socket(int s);
+
+static void event_callback(struct netconn *conn, enum netconn_evt evt, u16_t len)
+{
+    int s;
+    struct lwip_sock *sock;
+    uint32_t event = 0;
+    SYS_ARCH_DECL_PROTECT(lev);
+
+    LWIP_UNUSED_ARG(len);
+
+    /* Get socket */
+    if (conn)
+    {
+        s = conn->socket;
+        if (s < 0)
+        {
+            /* Data comes in right away after an accept, even though
+             * the server task might not have created a new socket yet.
+             * Just count down (or up) if that's the case and we
+             * will use the data later. Note that only receive events
+             * can happen before the new socket is set up. */
+            SYS_ARCH_PROTECT(lev);
+            if (conn->socket < 0)
+            {
+                if (evt == NETCONN_EVT_RCVPLUS)
+                {
+                    conn->socket--;
+                }
+                SYS_ARCH_UNPROTECT(lev);
+                return;
+            }
+            s = conn->socket;
+            SYS_ARCH_UNPROTECT(lev);
+        }
+
+        sock = lwip_tryget_socket(s);
+        if (!sock)
+        {
+            return;
+        }
+    }
+    else
+    {
+        return;
+    }
+
+    SYS_ARCH_PROTECT(lev);
+    /* Set event as required */
+    switch (evt)
+    {
+    case NETCONN_EVT_RCVPLUS:
+        sock->rcvevent++;
+        break;
+    case NETCONN_EVT_RCVMINUS:
+        sock->rcvevent--;
+        break;
+    case NETCONN_EVT_SENDPLUS:
+        sock->sendevent = 1;
+        break;
+    case NETCONN_EVT_SENDMINUS:
+        sock->sendevent = 0;
+        break;
+    case NETCONN_EVT_ERROR:
+        sock->errevent = 1;
+        break;
+    default:
+        LWIP_ASSERT("unknown event", 0);
+        break;
+    }
+
+#if LWIP_VERSION >= 0x20100ff
+    if ((void*)(sock->lastdata.pbuf) || (sock->rcvevent > 0))
+#else
+    if ((void*)(sock->lastdata) || (sock->rcvevent > 0))
+#endif
+        event |= POLLIN;
+    if (sock->sendevent)
+        event |= POLLOUT;
+    if (sock->errevent)
+        event |= POLLERR;
+
+    SYS_ARCH_UNPROTECT(lev);
+
+    if (event)
+    {
+        rt_wqueue_wakeup(&sock->wait_head, (void*) event);
+    }
+}
+#endif /* SAL_USING_POSIX */
+
+static int inet_socket(int domain, int type, int protocol)
+{
+#ifdef SAL_USING_POSIX
+    int socket;
+
+    socket = lwip_socket(domain, type, protocol);
+    if (socket >= 0)
+    {
+        struct lwip_sock *lwsock;
+
+        lwsock = lwip_tryget_socket(socket);
+        lwsock->conn->callback = event_callback;
+
+        rt_wqueue_init(&lwsock->wait_head);
+    }
+
+    return socket;
+#else
+    return lwip_socket(domain, type, protocol);
+#endif /* SAL_USING_POSIX */
+}
+
+static int inet_accept(int socket, struct sockaddr *addr, socklen_t *addrlen)
+{
+#ifdef SAL_USING_POSIX
+    int new_socket;
+
+    new_socket = lwip_accept(socket, addr, addrlen);
+    if (new_socket >= 0)
+    {
+        struct lwip_sock *lwsock;
+
+        lwsock = lwip_tryget_socket(new_socket);
+
+        rt_wqueue_init(&lwsock->wait_head);
+    }
+
+    return new_socket;
+#else
+    return lwip_accept(socket, addr, addrlen);
+#endif /* SAL_USING_POSIX */
+}
+
+static int inet_getsockname(int socket, struct sockaddr *name, socklen_t *namelen)
+{
+#if LWIP_VERSION_MAJOR < 2U
+    rt_kprintf("ERROR: Your lwIP version is not supported. Please using lwIP 2.0.0+.\n");
+    RT_ASSERT(LWIP_VERSION_MAJOR >= 2U);
+#endif
+
+    return lwip_getsockname(socket, name, namelen);
+}
+
+int inet_ioctlsocket(int socket, long cmd, void *arg)
+{
+    switch (cmd)
+    {
+    case F_GETFL:
+    case F_SETFL:
+        return lwip_fcntl(socket, cmd, (int) arg);
+
+    default:
+        return lwip_ioctl(socket, cmd, arg);
+    }
+}
+
+#ifdef SAL_USING_POSIX
+static int inet_poll(struct dfs_fd *file, struct rt_pollreq *req)
+{
+    int mask = 0;
+    struct lwip_sock *sock;
+    struct sal_socket *sal_sock;
+
+    sal_sock = sal_get_socket((int) file->data);
+    if(!sal_sock)
+    {
+        return -1;
+    }
+
+    sock = lwip_tryget_socket((int)sal_sock->user_data);
+    if (sock != NULL)
+    {
+        rt_base_t level;
+
+        rt_poll_add(&sock->wait_head, req);
+
+        level = rt_hw_interrupt_disable();
+
+#if LWIP_VERSION >= 0x20100ff
+        if ((void*)(sock->lastdata.pbuf) || sock->rcvevent)
+#else
+        if ((void*)(sock->lastdata) || sock->rcvevent)
+#endif
+        {
+            mask |= POLLIN;
+        }
+        if (sock->sendevent)
+        {
+            mask |= POLLOUT;
+        }
+        if (sock->errevent)
+        {
+            mask |= POLLERR;
+            /* clean error event */
+            sock->errevent = 0;
+        }
+        rt_hw_interrupt_enable(level);
+    }
+
+    return mask;
+}
+#endif
+
+static const struct sal_socket_ops lwip_socket_ops =
+{
+    inet_socket,
+    lwip_close,
+    lwip_bind,
+    lwip_listen,
+    lwip_connect,
+    inet_accept,
+    (int (*)(int, const void *, size_t, int, const struct sockaddr *, socklen_t))lwip_sendto,
+    (int (*)(int, void *, size_t, int, struct sockaddr *, socklen_t *))lwip_recvfrom,
+    lwip_getsockopt,
+    //TODO fix on 1.4.1
+    lwip_setsockopt,
+    lwip_shutdown,
+    lwip_getpeername,
+    inet_getsockname,
+    inet_ioctlsocket,
+#ifdef SAL_USING_POSIX
+    inet_poll,
+#endif
+};
+
+static const struct sal_netdb_ops lwip_netdb_ops =
+{
+    lwip_gethostbyname,
+    lwip_gethostbyname_r,
+    lwip_getaddrinfo,
+    lwip_freeaddrinfo,
+};
+
+static const struct sal_proto_family lwip_inet_family =
+{
+    AF_INET,
+#if LWIP_VERSION > 0x2000000
+    AF_INET6,
+#else
+    AF_INET,
+#endif
+    &lwip_socket_ops,
+    &lwip_netdb_ops,
+};
+
+/* Set lwIP network interface device protocol family information */
+int sal_lwip_netdev_set_pf_info(struct netdev *netdev)
+{
+    RT_ASSERT(netdev);
+
+    netdev->sal_user_data = (void *) &lwip_inet_family;
+    return 0;
+}
+
+#endif /* SAL_USING_LWIP */

rt-thread/components/net/sal/impl/proto_mbedtls.c

@@ -0,0 +1,249 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-11-12     ChenYong     First version
+ */
+
+#include <rtthread.h>
+
+#ifdef RT_USING_DFS
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/statfs.h>
+#endif
+
+#ifdef SAL_USING_TLS
+#include <sal_tls.h>
+#endif
+#include <netdb.h>
+#include <sal_low_lvl.h>
+
+#include <netdev.h>
+
+#ifdef SAL_USING_TLS
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include <mbedtls/config.h>
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#include <tls_certificate.h>
+#include <tls_client.h>
+
+#ifndef SAL_MEBDTLS_BUFFER_LEN
+#define SAL_MEBDTLS_BUFFER_LEN         1024
+#endif
+
+static void *mebdtls_socket(int socket)
+{
+    MbedTLSSession *session = RT_NULL;
+    char *pers = "mbedtls";
+
+    if (socket < 0)
+    {
+        return RT_NULL;
+    }
+
+    session = (MbedTLSSession *) tls_calloc(1, sizeof(MbedTLSSession));
+    if (session == RT_NULL)
+    {
+        return RT_NULL;
+    }
+
+    session->buffer_len = SAL_MEBDTLS_BUFFER_LEN;
+    session->buffer = tls_calloc(1, session->buffer_len);
+    if (session->buffer == RT_NULL)
+    {
+        tls_free(session);
+        session = RT_NULL;
+
+        return RT_NULL;
+    }
+
+    /* initialize TLS Client sesison */
+    if (mbedtls_client_init(session, (void *) pers, rt_strlen(pers)) != RT_EOK)
+    {
+        mbedtls_client_close(session);
+        return RT_NULL;
+    }
+    session->server_fd.fd = socket;
+
+    return (void *)session;
+}
+
+int mbedtls_net_send_cb(void *ctx, const unsigned char *buf, size_t len)
+{
+    struct sal_socket *sock;
+    int socket, ret;
+    struct sal_proto_family *pf;
+
+    RT_ASSERT(ctx);
+    RT_ASSERT(buf);
+
+    socket = ((mbedtls_net_context *) ctx)->fd;
+    sock = sal_get_socket(socket);
+    if (sock == RT_NULL)
+    {
+        return -1;
+    }
+
+    pf = (struct sal_proto_family *)sock->netdev->sal_user_data;
+
+    /* Register scoket sendto option to TLS send data callback */
+    ret = pf->skt_ops->sendto((int) sock->user_data, (void *)buf, len, 0, RT_NULL, RT_NULL);
+    if (ret < 0)
+    {
+#ifdef RT_USING_DFS
+        if ((fcntl(socket, F_GETFL) & O_NONBLOCK) == O_NONBLOCK)
+            return MBEDTLS_ERR_SSL_WANT_WRITE;
+#endif
+        if (errno == ECONNRESET)
+            return MBEDTLS_ERR_NET_CONN_RESET;
+        if ( errno == EINTR)
+            return MBEDTLS_ERR_SSL_WANT_READ;
+
+        return MBEDTLS_ERR_NET_SEND_FAILED ;
+    }
+
+    return ret;
+}
+
+int mbedtls_net_recv_cb( void *ctx, unsigned char *buf, size_t len)
+{
+    struct sal_socket *sock;
+    struct sal_proto_family *pf;
+    int socket, ret;
+
+    RT_ASSERT(ctx);
+    RT_ASSERT(buf);
+
+    socket = ((mbedtls_net_context *) ctx)->fd;
+    sock = sal_get_socket(socket);
+    if (sock == RT_NULL)
+    {
+        return -1;
+    }
+
+    pf = (struct sal_proto_family *)sock->netdev->sal_user_data;
+
+    /* Register scoket recvfrom option to TLS recv data callback */
+    ret = pf->skt_ops->recvfrom((int) sock->user_data, (void *)buf, len, 0, RT_NULL, RT_NULL);
+    if (ret < 0)
+    {
+#ifdef RT_USING_DFS
+        if ((fcntl(socket, F_GETFL) & O_NONBLOCK) == O_NONBLOCK)
+            return MBEDTLS_ERR_SSL_WANT_WRITE;
+#endif
+        if (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;
+}
+
+static int mbedtls_connect(void *sock)
+{
+    MbedTLSSession *session = RT_NULL;
+    int ret = 0;
+
+    RT_ASSERT(sock);
+
+    session = (MbedTLSSession *) sock;
+
+    /* Set the SSL Configure infromation */
+    ret = mbedtls_client_context(session);
+    if (ret < 0)
+    {
+        goto __exit;
+    }
+
+    /* Set the underlying BIO callbacks for write, read and read-with-timeout.  */
+    mbedtls_ssl_set_bio(&session->ssl, &session->server_fd, mbedtls_net_send_cb, mbedtls_net_recv_cb, RT_NULL);
+
+    while ((ret = mbedtls_ssl_handshake(&session->ssl)) != 0)
+    {
+        if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE)
+        {
+            goto __exit;
+        }
+    }
+
+    /* Return the result of the certificate verification */
+    ret = mbedtls_ssl_get_verify_result(&session->ssl);
+    if (ret != 0)
+    {
+        rt_memset(session->buffer, 0x00, session->buffer_len);
+        mbedtls_x509_crt_verify_info((char *)session->buffer, session->buffer_len, "  ! ", ret);
+        goto __exit;
+    }
+
+    return ret;
+
+__exit:
+    if (session)
+    {
+        mbedtls_client_close(session);
+    }
+
+    return ret;
+}
+
+static int mbedtls_closesocket(void *sock)
+{
+    struct sal_socket *ssock;
+    int socket;
+
+    if (sock == RT_NULL)
+    {
+        return 0;
+    }
+
+    socket = ((MbedTLSSession *) sock)->server_fd.fd;
+    ssock = sal_get_socket(socket);
+    if (ssock == RT_NULL)
+    {
+        return -1;
+    }
+
+    /* Close TLS client session, and clean user-data in SAL socket */
+    mbedtls_client_close((MbedTLSSession *) sock);
+    ssock->user_data_tls = RT_NULL;
+
+    return 0;
+}
+
+static const struct sal_proto_tls_ops mbedtls_proto_ops=
+{
+    RT_NULL,
+    mebdtls_socket,
+    mbedtls_connect,
+    (int (*)(void *sock, const void *data, size_t size)) mbedtls_client_write,
+    (int (*)(void *sock, void *mem, size_t len)) mbedtls_client_read,
+    mbedtls_closesocket,
+};
+
+static const struct sal_proto_tls mbedtls_proto =
+{
+    "mbedtls",
+    &mbedtls_proto_ops,
+};
+
+int sal_mbedtls_proto_init(void)
+{
+    /* register MbedTLS protocol options to SAL */
+    sal_proto_tls_register(&mbedtls_proto);
+
+    return 0;
+}
+INIT_COMPONENT_EXPORT(sal_mbedtls_proto_init);
+
+#endif /* SAL_USING_TLS */

rt-thread/components/net/sal/include/dfs_net/dfs_net.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2015-02-17     Bernard      First version
+ * 2016-05-05     Bernard      rename dfs_lwip to dfs_net.
+ */
+
+#ifndef DFS_NET_H__
+#define DFS_NET_H__
+
+#include <dfs_file.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+const struct dfs_file_ops* dfs_net_get_fops(void);
+int dfs_net_getsocket(int fd);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+

rt-thread/components/net/sal/include/sal_low_lvl.h

@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-05-17     ChenYong     First version
+ * 2022-05-15     Meco Man     rename sal.h as sal_low_lvl.h to avoid conflicts
+ *                             with Microsoft Visual Studio header file
+ */
+
+#ifndef SAL_LOW_LEVEL_H__
+#define SAL_LOW_LEVEL_H__
+
+#include <rtdevice.h>
+
+#ifdef SAL_USING_POSIX
+#include <dfs_file.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if !defined(socklen_t) && !defined(SOCKLEN_T_DEFINED)
+typedef uint32_t socklen_t;
+#endif
+
+/* SAL socket magic word */
+#define SAL_SOCKET_MAGIC               0x5A10
+
+/* The maximum number of sockets structure */
+#ifndef SAL_SOCKETS_NUM
+#define SAL_SOCKETS_NUM                DFS_FD_MAX
+#endif
+
+/* The maximum number of protocol families */
+#ifndef SAL_PROTO_FAMILIES_NUM
+#define SAL_PROTO_FAMILIES_NUM         4
+#endif
+
+/* SAL socket offset */
+#ifndef SAL_SOCKET_OFFSET
+#define SAL_SOCKET_OFFSET              0
+#endif
+
+struct sal_socket
+{
+    uint32_t magic;                    /* SAL socket magic word */
+
+    int socket;                        /* SAL socket descriptor */
+    int domain;
+    int type;
+    int protocol;
+
+    struct netdev *netdev;             /* SAL network interface device */
+
+    void *user_data;                   /* user-specific data */
+#ifdef SAL_USING_TLS
+    void *user_data_tls;               /* user-specific TLS data */
+#endif
+};
+
+/* network interface socket opreations */
+struct sal_socket_ops
+{
+    int (*socket)     (int domain, int type, int protocol);
+    int (*closesocket)(int s);
+    int (*bind)       (int s, const struct sockaddr *name, socklen_t namelen);
+    int (*listen)     (int s, int backlog);
+    int (*connect)    (int s, const struct sockaddr *name, socklen_t namelen);
+    int (*accept)     (int s, struct sockaddr *addr, socklen_t *addrlen);
+    int (*sendto)     (int s, const void *data, size_t size, int flags, const struct sockaddr *to, socklen_t tolen);
+    int (*recvfrom)   (int s, void *mem, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen);
+    int (*getsockopt) (int s, int level, int optname, void *optval, socklen_t *optlen);
+    int (*setsockopt) (int s, int level, int optname, const void *optval, socklen_t optlen);
+    int (*shutdown)   (int s, int how);
+    int (*getpeername)(int s, struct sockaddr *name, socklen_t *namelen);
+    int (*getsockname)(int s, struct sockaddr *name, socklen_t *namelen);
+    int (*ioctlsocket)(int s, long cmd, void *arg);
+#ifdef SAL_USING_POSIX
+    int (*poll)       (struct dfs_fd *file, struct rt_pollreq *req);
+#endif
+};
+
+/* sal network database name resolving */
+struct sal_netdb_ops
+{
+    struct hostent* (*gethostbyname)  (const char *name);
+    int             (*gethostbyname_r)(const char *name, struct hostent *ret, char *buf, size_t buflen, struct hostent **result, int *h_errnop);
+    int             (*getaddrinfo)    (const char *nodename, const char *servname, const struct addrinfo *hints, struct addrinfo **res);
+    void            (*freeaddrinfo)   (struct addrinfo *ai);
+};
+
+struct sal_proto_family
+{
+    int family;                                  /* primary protocol families type */
+    int sec_family;                              /* secondary protocol families type */
+    const struct sal_socket_ops *skt_ops;        /* socket opreations */
+    const struct sal_netdb_ops *netdb_ops;       /* network database opreations */
+};
+
+/* SAL(Socket Abstraction Layer) initialize */
+int sal_init(void);
+/* Get SAL socket object by socket descriptor */
+struct sal_socket *sal_get_socket(int sock);
+
+/* check SAL socket netweork interface device internet status */
+int sal_check_netdev_internet_up(struct netdev *netdev);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SAL_H__ */

rt-thread/components/net/sal/include/sal_netdb.h

@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-05-24     ChenYong     First version
+ */
+#ifndef SAL_NETDB_H__
+#define SAL_NETDB_H__
+
+#include <stddef.h>
+#include "sal_socket.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define EAI_NONAME      200
+#define EAI_SERVICE     201
+#define EAI_FAIL        202
+#define EAI_MEMORY      203
+#define EAI_FAMILY      204
+
+#define HOST_NOT_FOUND  210
+#define NO_DATA         211
+#define NO_RECOVERY     212
+#define TRY_AGAIN       213
+
+#define AI_PASSIVE      0x01
+#define AI_CANONNAME    0x02
+#define AI_NUMERICHOST  0x04
+#define AI_NUMERICSERV  0x08
+#define AI_V4MAPPED     0x10
+#define AI_ALL          0x20
+#define AI_ADDRCONFIG   0x40
+
+/* input flags for structure addrinfo */
+#define AI_PASSIVE      0x01
+#define AI_CANONNAME    0x02
+#define AI_NUMERICHOST  0x04
+#define AI_NUMERICSERV  0x08
+#define AI_V4MAPPED     0x10
+#define AI_ALL          0x20
+#define AI_ADDRCONFIG   0x40
+
+#define DNS_MAX_NAME_LENGTH 256
+
+struct hostent {
+    char  *h_name;      /* Official name of the host. */
+    char **h_aliases;   /* A pointer to an array of pointers to alternative host names,
+                           terminated by a null pointer. */
+    int    h_addrtype;  /* Address type. */
+    int    h_length;    /* The length, in bytes, of the address. */
+    char **h_addr_list; /* A pointer to an array of pointers to network addresses (in
+                           network byte order) for the host, terminated by a null pointer. */
+#define h_addr h_addr_list[0] /* for backward compatibility */
+};
+
+struct addrinfo {
+    int               ai_flags;      /* Input flags. */
+    int               ai_family;     /* Address family of socket. */
+    int               ai_socktype;   /* Socket type. */
+    int               ai_protocol;   /* Protocol of socket. */
+    socklen_t         ai_addrlen;    /* Length of socket address. */
+    struct sockaddr  *ai_addr;       /* Socket address of socket. */
+    char             *ai_canonname;  /* Canonical name of service location. */
+    struct addrinfo  *ai_next;       /* Pointer to next in list. */
+};
+
+struct hostent *sal_gethostbyname(const char *name);
+
+int sal_gethostbyname_r(const char *name, struct hostent *ret, char *buf,
+                size_t buflen, struct hostent **result, int *h_errnop);
+void sal_freeaddrinfo(struct addrinfo *ai);
+int sal_getaddrinfo(const char *nodename,
+       const char *servname,
+       const struct addrinfo *hints,
+       struct addrinfo **res);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SAL_NETDB_H__ */

rt-thread/components/net/sal/include/sal_socket.h

@@ -0,0 +1,218 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-05-24     ChenYong     First version
+ */
+
+#ifndef SAL_SOCKET_H__
+#define SAL_SOCKET_H__
+
+#include <stddef.h>
+#include <arpa/inet.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if !defined(socklen_t) && !defined(SOCKLEN_T_DEFINED)
+typedef uint32_t socklen_t;
+#endif
+
+#if !defined(sa_family_t) && !defined(SA_FAMILY_T_DEFINED)
+typedef uint8_t sa_family_t;
+#endif
+
+/* If your port already typedef's in_port_t, define IN_PORT_T_DEFINED
+   to prevent this code from redefining it. */
+#if !defined(in_port_t) && !defined(IN_PORT_T_DEFINED)
+typedef uint16_t in_port_t;
+#endif
+
+/* Socket protocol types (TCP/UDP/RAW) */
+#define SOCK_STREAM     1
+#define SOCK_DGRAM      2
+#define SOCK_RAW        3
+
+#define SOCK_MAX        (SOCK_RAW + 1)
+
+/* Option flags per-socket. These must match the SOF_ flags in ip.h (checked in init.c) */
+#define SO_REUSEADDR    0x0004 /* Allow local address reuse */
+#define SO_KEEPALIVE    0x0008 /* keep connections alive */
+#define SO_BROADCAST    0x0020 /* permit to send and to receive broadcast messages (see IP_SOF_BROADCAST option) */
+
+/* Additional options, not kept in so_options */
+#define SO_DEBUG        0x0001 /* Unimplemented: turn on debugging info recording */
+#define SO_ACCEPTCONN   0x0002 /* socket has had listen() */
+#define SO_DONTROUTE    0x0010 /* Unimplemented: just use interface addresses */
+#define SO_USELOOPBACK  0x0040 /* Unimplemented: bypass hardware when possible */
+#define SO_LINGER       0x0080 /* linger on close if data present */
+#define SO_DONTLINGER   ((int)(~SO_LINGER))
+#define SO_OOBINLINE    0x0100 /* Unimplemented: leave received OOB data in line */
+#define SO_REUSEPORT    0x0200 /* Unimplemented: allow local address & port reuse */
+#define SO_SNDBUF       0x1001 /* Unimplemented: send buffer size */
+#define SO_RCVBUF       0x1002 /* receive buffer size */
+#define SO_SNDLOWAT     0x1003 /* Unimplemented: send low-water mark */
+#define SO_RCVLOWAT     0x1004 /* Unimplemented: receive low-water mark */
+#define SO_SNDTIMEO     0x1005 /* send timeout */
+#define SO_RCVTIMEO     0x1006 /* receive timeout */
+#define SO_ERROR        0x1007 /* get error status and clear */
+#define SO_TYPE         0x1008 /* get socket type */
+#define SO_CONTIMEO     0x1009 /* Unimplemented: connect timeout */
+#define SO_NO_CHECK     0x100a /* don't create UDP checksum */
+
+/* Level number for (get/set)sockopt() to apply to socket itself */
+#define  SOL_SOCKET     0xfff    /* options for socket level */
+
+#define AF_UNSPEC       0
+#define AF_INET         2
+#define AF_INET6        10
+#define AF_CAN          29  /* Controller Area Network      */
+#define AF_AT           45  /* AT socket */
+#define AF_WIZ          46  /* WIZnet socket */
+#define PF_INET         AF_INET
+#define PF_INET6        AF_INET6
+#define PF_UNSPEC       AF_UNSPEC
+#define PF_CAN          AF_CAN
+#define PF_AT           AF_AT
+#define PF_WIZ          AF_WIZ
+
+#define AF_MAX          (AF_WIZ + 1)  /* For now.. */
+
+#define IPPROTO_IP      0
+#define IPPROTO_ICMP    1
+#define IPPROTO_TCP     6
+#define IPPROTO_UDP     17
+#define IPPROTO_IPV6    41
+#define IPPROTO_ICMPV6  58
+#define IPPROTO_UDPLITE 136
+#define IPPROTO_RAW     255
+
+/* Flags we can use with send and recv */
+#define MSG_PEEK        0x01    /* Peeks at an incoming message */
+#define MSG_WAITALL     0x02    /* Unimplemented: Requests that the function block until the full amount of data requested can be returned */
+#define MSG_OOB         0x04    /* Unimplemented: Requests out-of-band data. The significance and semantics of out-of-band data are protocol-specific */
+#define MSG_DONTWAIT    0x08    /* Nonblocking i/o for this operation only */
+#define MSG_MORE        0x10    /* Sender will send more */
+
+/* Options for level IPPROTO_IP */
+#define IP_TOS             1
+#define IP_TTL             2
+
+/* Options for level IPPROTO_TCP */
+#define TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
+#define TCP_KEEPALIVE   0x02    /* send KEEPALIVE probes when idle for pcb->keep_idle milliseconds */
+#define TCP_KEEPIDLE    0x03    /* set pcb->keep_idle  - Same as TCP_KEEPALIVE, but use seconds for get/setsockopt */
+#define TCP_KEEPINTVL   0x04    /* set pcb->keep_intvl - Use seconds for get/setsockopt */
+#define TCP_KEEPCNT     0x05    /* set pcb->keep_cnt   - Use number of probes sent for get/setsockopt */
+
+/* Options and types related to multicast membership */
+#define IP_ADD_MEMBERSHIP  3
+#define IP_DROP_MEMBERSHIP 4
+/* Options and types for UDP multicast traffic handling */
+#define IP_MULTICAST_TTL   5
+#define IP_MULTICAST_IF    6
+#define IP_MULTICAST_LOOP  7
+
+typedef struct ip_mreq
+{
+    struct in_addr imr_multiaddr; /* IP multicast address of group */
+    struct in_addr imr_interface; /* local IP address of interface */
+} ip_mreq;
+
+/* The Type of Service provides an indication of the abstract parameters of the quality of service desired */
+#define IPTOS_TOS_MASK                 0x1E
+#define IPTOS_TOS(tos)                 ((tos) & IPTOS_TOS_MASK)
+#define IPTOS_LOWDELAY                 0x10
+#define IPTOS_THROUGHPUT               0x08
+#define IPTOS_RELIABILITY              0x04
+#define IPTOS_LOWCOST                  0x02
+#define IPTOS_MINCOST                  IPTOS_LOWCOST
+
+/* The Network Control precedence designation is intended to be used within a network only */
+#define IPTOS_PREC_MASK                0xe0
+#define IPTOS_PREC(tos)                ((tos) & IPTOS_PREC_MASK)
+#define IPTOS_PREC_NETCONTROL          0xe0
+#define IPTOS_PREC_INTERNETCONTROL     0xc0
+#define IPTOS_PREC_CRITIC_ECP          0xa0
+#define IPTOS_PREC_FLASHOVERRIDE       0x80
+#define IPTOS_PREC_FLASH               0x60
+#define IPTOS_PREC_IMMEDIATE           0x40
+#define IPTOS_PREC_PRIORITY            0x20
+#define IPTOS_PREC_ROUTINE             0x00
+
+/* Options for shatdown type */
+#ifndef SHUT_RD
+  #define SHUT_RD       0
+  #define SHUT_WR       1
+  #define SHUT_RDWR     2
+#endif
+
+struct sockaddr
+{
+    uint8_t        sa_len;
+    sa_family_t    sa_family;
+    char           sa_data[14];
+};
+
+#if NETDEV_IPV4
+/* members are in network byte order */
+struct sockaddr_in
+{
+    uint8_t        sin_len;
+    sa_family_t    sin_family;
+    in_port_t      sin_port;
+    struct in_addr sin_addr;
+#define SIN_ZERO_LEN 8
+    char            sin_zero[SIN_ZERO_LEN];
+};
+#endif /* NETDEV_IPV4 */
+
+#if NETDEV_IPV6
+struct sockaddr_in6
+{
+  uint8_t         sin6_len;      /* length of this structure    */
+  sa_family_t     sin6_family;   /* AF_INET6                    */
+  in_port_t       sin6_port;     /* Transport layer port #      */
+  uint32_t        sin6_flowinfo; /* IPv6 flow information       */
+  struct in6_addr sin6_addr;     /* IPv6 address                */
+  uint32_t        sin6_scope_id; /* Set of interfaces for scope */
+};
+#endif /* NETDEV_IPV6 */
+
+struct sockaddr_storage
+{
+    uint8_t        s2_len;
+    sa_family_t    ss_family;
+    char           s2_data1[2];
+    uint32_t       s2_data2[3];
+#if NETDEV_IPV6
+    uint32_t       s2_data3[3];
+#endif /* NETDEV_IPV6 */
+};
+
+int sal_accept(int socket, struct sockaddr *addr, socklen_t *addrlen);
+int sal_bind(int socket, const struct sockaddr *name, socklen_t namelen);
+int sal_shutdown(int socket, int how);
+int sal_getpeername (int socket, struct sockaddr *name, socklen_t *namelen);
+int sal_getsockname (int socket, struct sockaddr *name, socklen_t *namelen);
+int sal_getsockopt (int socket, int level, int optname, void *optval, socklen_t *optlen);
+int sal_setsockopt (int socket, int level, int optname, const void *optval, socklen_t optlen);
+int sal_connect(int socket, const struct sockaddr *name, socklen_t namelen);
+int sal_listen(int socket, int backlog);
+int sal_recvfrom(int socket, void *mem, size_t len, int flags,
+      struct sockaddr *from, socklen_t *fromlen);
+int sal_sendto(int socket, const void *dataptr, size_t size, int flags,
+    const struct sockaddr *to, socklen_t tolen);
+int sal_socket(int domain, int type, int protocol);
+int sal_closesocket(int socket);
+int sal_ioctlsocket(int socket, long cmd, void *arg);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SAL_SOCKET_H__ */

rt-thread/components/net/sal/include/sal_tls.h

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-11-10     ChenYong     First version
+ */
+#ifndef __SAL_TLS_H__
+#define __SAL_TLS_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rtthread.h>
+
+/* Protocol level for TLS.
+ * Here, the same socket protocol level for TLS as in Linux was used.
+ */
+#define SOL_TLS             282
+
+/* Socket options for TLS */
+
+/* Socket option to select TLS credentials to use. */
+#define TLS_CRET_LIST        1
+/* Socket option to set select ciphersuites to use. */
+#define TLS_CIPHERSUITE_LIST 2
+/* Socket option to set peer verification level for TLS connection. */
+#define TLS_PEER_VERIFY      3
+/* Socket option to set role for DTLS connection. */
+#define TLS_DTLS_ROLE        4
+
+/* Protocol numbers for TLS protocols */
+#define PROTOCOL_TLS         256
+#define PROTOCOL_DTLS        257
+
+
+struct sal_proto_tls_ops
+{
+    int (*init)(void);
+    void* (*socket)(int socket);
+    int (*connect)(void *sock);
+    int (*send)(void *sock, const void *data, size_t size);
+    int (*recv)(void *sock, void *mem, size_t len);
+    int (*closesocket)(void *sock);
+
+    int (*set_cret_list)(void *sock, const void *cert, size_t size);              /* Set TLS credentials */
+    int (*set_ciphersurite)(void *sock, const void* ciphersurite, size_t size);   /* Set select ciphersuites */
+    int (*set_peer_verify)(void *sock, const void* peer_verify, size_t size);     /* Set peer verification */
+    int (*set_dtls_role)(void *sock, const void *dtls_role, size_t size);         /* Set role for DTLS */
+};
+
+struct sal_proto_tls
+{
+    char name[RT_NAME_MAX];                      /* TLS protocol name */
+    const struct sal_proto_tls_ops *ops;         /* SAL TLS protocol options */
+};
+
+/* SAL TLS protocol register */
+int sal_proto_tls_register(const struct sal_proto_tls *pt);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __SAL_TLS_H__ */

rt-thread/components/net/sal/include/socket/netdb.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2015-02-17     Bernard      First version
+ * 2018-05-24     ChenYong     Add socket abstraction layer
+ */
+
+#ifndef NETDB_H__
+#define NETDB_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stddef.h>
+#include <sal_netdb.h>
+
+struct hostent *gethostbyname(const char *name);
+
+int gethostbyname_r(const char *name, struct hostent *ret, char *buf,
+                size_t buflen, struct hostent **result, int *h_errnop);
+void freeaddrinfo(struct addrinfo *ai);
+int getaddrinfo(const char *nodename,
+       const char *servname,
+       const struct addrinfo *hints,
+       struct addrinfo **res);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

rt-thread/components/net/sal/include/socket/netinet/in.h

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2015-02-17     Bernard      First version
+ */
+
+#ifndef IN_H__
+#define IN_H__
+
+#include <sys/socket.h>
+
+#ifndef IN6_IS_ADDR_MULTICAST
+#define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
+#endif
+
+#endif

rt-thread/components/net/sal/include/socket/netinet/tcp.h

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2015-02-17     Bernard      First version
+ */
+
+#ifndef TCP_H__
+#define TCP_H__
+
+#include <sys/socket.h>
+
+#endif

rt-thread/components/net/sal/include/socket/netinet/udp.h

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2015-02-17     Bernard      First version
+ */
+
+#ifndef UDP_H__
+#define UDP_H__
+
+#include <sys/socket.h>
+
+#endif

rt-thread/components/net/sal/include/socket/sys_socket/sys/socket.h

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2015-02-17     Bernard      First version
+ * 2018-05-17     ChenYong     Add socket abstraction layer
+ */
+
+#ifndef SYS_SOCKET_H_
+#define SYS_SOCKET_H_
+
+#include <rtthread.h>
+#include <sal_socket.h>
+#ifdef SAL_USING_TLS
+#include <sal_tls.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef SAL_USING_POSIX
+int accept(int s, struct sockaddr *addr, socklen_t *addrlen);
+int bind(int s, const struct sockaddr *name, socklen_t namelen);
+int shutdown(int s, int how);
+int getpeername(int s, struct sockaddr *name, socklen_t *namelen);
+int getsockname(int s, struct sockaddr *name, socklen_t *namelen);
+int getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen);
+int setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen);
+int connect(int s, const struct sockaddr *name, socklen_t namelen);
+int listen(int s, int backlog);
+int recv(int s, void *mem, size_t len, int flags);
+int recvfrom(int s, void *mem, size_t len, int flags,
+      struct sockaddr *from, socklen_t *fromlen);
+int send(int s, const void *dataptr, size_t size, int flags);
+int sendto(int s, const void *dataptr, size_t size, int flags,
+    const struct sockaddr *to, socklen_t tolen);
+int socket(int domain, int type, int protocol);
+int closesocket(int s);
+int ioctlsocket(int s, long cmd, void *arg);
+#else
+#define accept(s, addr, addrlen)                           sal_accept(s, addr, addrlen)
+#define bind(s, name, namelen)                             sal_bind(s, name, namelen)
+#define shutdown(s, how)                                   sal_shutdown(s, how)
+#define getpeername(s, name, namelen)                      sal_getpeername(s, name, namelen)
+#define getsockname(s, name, namelen)                      sal_getsockname(s, name, namelen)
+#define getsockopt(s, level, optname, optval, optlen)      sal_getsockopt(s, level, optname, optval, optlen)
+#define setsockopt(s, level, optname, optval, optlen)      sal_setsockopt(s, level, optname, optval, optlen)
+#define connect(s, name, namelen)                          sal_connect(s, name, namelen)
+#define listen(s, backlog)                                 sal_listen(s, backlog)
+#define recv(s, mem, len, flags)                           sal_recvfrom(s, mem, len, flags, NULL, NULL)
+#define recvfrom(s, mem, len, flags, from, fromlen)        sal_recvfrom(s, mem, len, flags, from, fromlen)
+#define send(s, dataptr, size, flags)                      sal_sendto(s, dataptr, size, flags, NULL, NULL)
+#define sendto(s, dataptr, size, flags, to, tolen)         sal_sendto(s, dataptr, size, flags, to, tolen)
+#define socket(domain, type, protocol)                     sal_socket(domain, type, protocol)
+#define closesocket(s)                                     sal_closesocket(s)
+#define ioctlsocket(s, cmd, arg)                           sal_ioctlsocket(s, cmd, arg)
+#endif /* SAL_USING_POSIX */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_SOCKET_H_ */

rt-thread/components/net/sal/socket/net_netdb.c

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2015-02-17     Bernard      First version
+ * 2108-05-24     ChenYong     Add socket abstraction layer
+ */
+
+#include <stddef.h>
+#include <rtthread.h>
+
+#include <netdb.h>
+
+struct hostent *gethostbyname(const char *name)
+{
+    return sal_gethostbyname(name);
+}
+RTM_EXPORT(gethostbyname);
+
+int gethostbyname_r(const char *name, struct hostent *ret, char *buf,
+                size_t buflen, struct hostent **result, int *h_errnop)
+{
+    return sal_gethostbyname_r(name, ret, buf, buflen, result, h_errnop);
+}
+RTM_EXPORT(gethostbyname_r);
+
+void freeaddrinfo(struct addrinfo *ai)
+{
+    sal_freeaddrinfo(ai);
+}
+RTM_EXPORT(freeaddrinfo);
+
+int getaddrinfo(const char *nodename,
+       const char *servname,
+       const struct addrinfo *hints,
+       struct addrinfo **res)
+{
+    return sal_getaddrinfo(nodename, servname, hints, res);
+}
+RTM_EXPORT(getaddrinfo);

rt-thread/components/net/sal/socket/net_sockets.c

@@ -0,0 +1,293 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2015-02-17     Bernard      First version
+ * 2018-05-17     ChenYong     Add socket abstraction layer
+ */
+
+#include <dfs.h>
+#include <dfs_file.h>
+#include <poll.h>
+#include <dfs_net.h>
+#include <sys/errno.h>
+#include <sys/socket.h>
+
+int accept(int s, struct sockaddr *addr, socklen_t *addrlen)
+{
+    int new_socket = -1;
+    int socket = dfs_net_getsocket(s);
+
+    new_socket = sal_accept(socket, addr, addrlen);
+    if (new_socket != -1)
+    {
+        /* this is a new socket, create it in file system fd */
+        int fd;
+        struct dfs_fd *d;
+
+        /* allocate a fd */
+        fd = fd_new();
+        if (fd < 0)
+        {
+            rt_set_errno(-ENOMEM);
+            sal_closesocket(new_socket);
+            return -1;
+        }
+
+        d = fd_get(fd);
+        if(d)
+        {
+            /* this is a socket fd */
+            d->type = FT_SOCKET;
+            d->path = NULL;
+
+            d->fops = dfs_net_get_fops();
+
+            d->flags = O_RDWR; /* set flags as read and write */
+            d->size = 0;
+            d->pos = 0;
+
+            /* set socket to the data of dfs_fd */
+            d->data = (void *) new_socket;
+
+            /* release the ref-count of fd */
+            fd_put(d);
+
+            return fd;
+        }
+
+        rt_set_errno(-ENOMEM);
+        sal_closesocket(new_socket);
+        return -1;
+    }
+
+    return -1;
+}
+RTM_EXPORT(accept);
+
+int bind(int s, const struct sockaddr *name, socklen_t namelen)
+{
+    int socket = dfs_net_getsocket(s);
+
+    return sal_bind(socket, name, namelen);
+}
+RTM_EXPORT(bind);
+
+int shutdown(int s, int how)
+{
+    int error = 0;
+    int socket = -1;
+    struct dfs_fd *d;
+
+    socket = dfs_net_getsocket(s);
+    if (socket < 0)
+    {
+        rt_set_errno(-ENOTSOCK);
+        return -1;
+    }
+
+    d = fd_get(s);
+    if (d == NULL)
+    {
+        rt_set_errno(-EBADF);
+        return -1;
+    }
+
+    if (sal_shutdown(socket, how) == 0)
+    {
+        error = 0;
+    }
+    else
+    {
+        rt_set_errno(-ENOTSOCK);
+        error = -1;
+    }
+
+    fd_put(d);
+
+    return error;
+}
+RTM_EXPORT(shutdown);
+
+int getpeername(int s, struct sockaddr *name, socklen_t *namelen)
+{
+    int socket = dfs_net_getsocket(s);
+
+    return sal_getpeername(socket, name, namelen);
+}
+RTM_EXPORT(getpeername);
+
+int getsockname(int s, struct sockaddr *name, socklen_t *namelen)
+{
+    int socket = dfs_net_getsocket(s);
+
+    return sal_getsockname(socket, name, namelen);
+}
+RTM_EXPORT(getsockname);
+
+int getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
+{
+    int socket = dfs_net_getsocket(s);
+
+    return sal_getsockopt(socket, level, optname, optval, optlen);
+}
+RTM_EXPORT(getsockopt);
+
+int setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen)
+{
+    int socket = dfs_net_getsocket(s);
+
+    return sal_setsockopt(socket, level, optname, optval, optlen);
+}
+RTM_EXPORT(setsockopt);
+
+int connect(int s, const struct sockaddr *name, socklen_t namelen)
+{
+    int socket = dfs_net_getsocket(s);
+
+    return sal_connect(socket, name, namelen);
+}
+RTM_EXPORT(connect);
+
+int listen(int s, int backlog)
+{
+    int socket = dfs_net_getsocket(s);
+
+    return sal_listen(socket, backlog);
+}
+RTM_EXPORT(listen);
+
+int recv(int s, void *mem, size_t len, int flags)
+{
+    int socket = dfs_net_getsocket(s);
+
+    return sal_recvfrom(socket, mem, len, flags, NULL, NULL);
+}
+RTM_EXPORT(recv);
+
+int recvfrom(int s, void *mem, size_t len, int flags,
+             struct sockaddr *from, socklen_t *fromlen)
+{
+    int socket = dfs_net_getsocket(s);
+
+    return sal_recvfrom(socket, mem, len, flags, from, fromlen);
+}
+RTM_EXPORT(recvfrom);
+
+int send(int s, const void *dataptr, size_t size, int flags)
+{
+    int socket = dfs_net_getsocket(s);
+
+    return sal_sendto(socket, dataptr, size, flags, NULL, 0);
+}
+RTM_EXPORT(send);
+
+int sendto(int s, const void *dataptr, size_t size, int flags,
+           const struct sockaddr *to, socklen_t tolen)
+{
+    int socket = dfs_net_getsocket(s);
+
+    return sal_sendto(socket, dataptr, size, flags, to, tolen);
+}
+RTM_EXPORT(sendto);
+
+int socket(int domain, int type, int protocol)
+{
+    /* create a BSD socket */
+    int fd;
+    int socket;
+    struct dfs_fd *d;
+
+    /* allocate a fd */
+    fd = fd_new();
+    if (fd < 0)
+    {
+        rt_set_errno(-ENOMEM);
+
+        return -1;
+    }
+    d = fd_get(fd);
+
+    /* create socket  and then put it to the dfs_fd */
+    socket = sal_socket(domain, type, protocol);
+    if (socket >= 0)
+    {
+        /* this is a socket fd */
+        d->type = FT_SOCKET;
+        d->path = NULL;
+
+        d->fops = dfs_net_get_fops();
+
+        d->flags = O_RDWR; /* set flags as read and write */
+        d->size = 0;
+        d->pos = 0;
+
+        /* set socket to the data of dfs_fd */
+        d->data = (void *) socket;
+    }
+    else
+    {
+        /* release fd */
+        fd_put(d);
+        fd_put(d);
+
+        rt_set_errno(-ENOMEM);
+
+        return -1;
+    }
+
+    /* release the ref-count of fd */
+    fd_put(d);
+
+    return fd;
+}
+RTM_EXPORT(socket);
+
+int closesocket(int s)
+{
+    int error = 0;
+    int socket = -1;
+    struct dfs_fd *d;
+
+    socket = dfs_net_getsocket(s);
+    if (socket < 0)
+    {
+        rt_set_errno(-ENOTSOCK);
+        return -1;
+    }
+
+    d = fd_get(s);
+    if (d == RT_NULL)
+    {
+        rt_set_errno(-EBADF);
+        return -1;
+    }
+
+    if (sal_closesocket(socket) == 0)
+    {
+        error = 0;
+    }
+    else
+    {
+        rt_set_errno(-ENOTSOCK);
+        error = -1;
+    }
+
+    /* socket has been closed, delete it from file system fd */
+    fd_put(d);
+    fd_put(d);
+
+    return error;
+}
+RTM_EXPORT(closesocket);
+
+int ioctlsocket(int s, long cmd, void *arg)
+{
+    int socket = dfs_net_getsocket(s);
+
+    return sal_ioctlsocket(socket, cmd, arg);
+}
+RTM_EXPORT(ioctlsocket);