[Net] Add telnet test app to LwIP 2.0.2 .

components/net/lwip-2.0.2/apps/telnet.c

@@ -0,0 +1,391 @@
+#include <rtthread.h>
+#include <lwip/api.h>
+#include <lwip/sockets.h>
+#include <rtdevice.h>
+
+#include <finsh.h>
+#include <shell.h>
+
+#define TELNET_PORT         23
+#define TELNET_BACKLOG      5
+#define RX_BUFFER_SIZE      256
+#define TX_BUFFER_SIZE      4096
+
+#define ISO_nl              0x0a
+#define ISO_cr              0x0d
+
+#define STATE_NORMAL        0
+#define STATE_IAC           1
+#define STATE_WILL          2
+#define STATE_WONT          3
+#define STATE_DO            4
+#define STATE_DONT          5
+#define STATE_CLOSE         6
+
+#define TELNET_IAC          255
+#define TELNET_WILL         251
+#define TELNET_WONT         252
+#define TELNET_DO           253
+#define TELNET_DONT         254
+
+struct telnet_session
+{
+    struct rt_ringbuffer rx_ringbuffer;
+    struct rt_ringbuffer tx_ringbuffer;
+
+    rt_mutex_t rx_ringbuffer_lock;
+    rt_mutex_t tx_ringbuffer_lock;
+
+    struct rt_device device;
+    rt_int32_t server_fd;
+    rt_int32_t client_fd;
+
+    /* telnet protocol */
+    rt_uint8_t state;
+    rt_uint8_t echo_mode;
+
+};
+
+static struct telnet_session* telnet;
+
+/* process tx data */
+static void send_to_client(struct telnet_session* telnet)
+{
+    rt_size_t length;
+    rt_uint8_t tx_buffer[32];
+
+    while (1)
+    {
+        rt_memset(tx_buffer, 0, sizeof(tx_buffer));
+        rt_mutex_take(telnet->tx_ringbuffer_lock, RT_WAITING_FOREVER);
+        /* get buffer from ringbuffer */
+        length = rt_ringbuffer_get(&(telnet->tx_ringbuffer), tx_buffer, sizeof(tx_buffer));
+        rt_mutex_release(telnet->tx_ringbuffer_lock);
+
+        /* do a tx procedure */
+        if (length > 0)
+        {
+            send(telnet->client_fd, tx_buffer, length, 0);
+        }
+        else break;
+    }
+}
+
+/* send telnet option to remote */
+static void send_option_to_client(struct telnet_session* telnet, rt_uint8_t option, rt_uint8_t value)
+{
+    rt_uint8_t optbuf[4];
+
+    optbuf[0] = TELNET_IAC;
+    optbuf[1] = option;
+    optbuf[2] = value;
+    optbuf[3] = 0;
+
+    rt_mutex_take(telnet->tx_ringbuffer_lock, RT_WAITING_FOREVER);
+    rt_ringbuffer_put(&telnet->tx_ringbuffer, optbuf, 3);
+    rt_mutex_release(telnet->tx_ringbuffer_lock);
+
+    send_to_client(telnet);
+}
+
+/* process rx data */
+static void process_rx(struct telnet_session* telnet, rt_uint8_t *data, rt_size_t length)
+{
+    rt_size_t rx_length, index;
+
+    for (index = 0; index < length; index ++)
+    {
+        switch(telnet->state)
+        {
+        case STATE_IAC:
+            if (*data == TELNET_IAC)
+            {
+                rt_mutex_take(telnet->rx_ringbuffer_lock, RT_WAITING_FOREVER);
+                /* put buffer to ringbuffer */
+                rt_ringbuffer_putchar(&(telnet->rx_ringbuffer), *data);
+                rt_mutex_release(telnet->rx_ringbuffer_lock);
+
+                telnet->state = STATE_NORMAL;
+            }
+            else
+            {
+                /* set telnet state according to received package */
+                switch (*data)
+                {
+                case TELNET_WILL: telnet->state = STATE_WILL; break;
+                case TELNET_WONT: telnet->state = STATE_WONT; break;
+                case TELNET_DO:   telnet->state = STATE_DO; break;
+                case TELNET_DONT: telnet->state = STATE_DONT; break;
+                default: telnet->state = STATE_NORMAL; break;
+                }
+            }
+            break;
+
+        /* don't option */
+        case STATE_WILL:
+        case STATE_WONT:
+            send_option_to_client(telnet, TELNET_DONT, *data);
+            telnet->state = STATE_NORMAL;
+            break;
+
+        /* won't option */
+        case STATE_DO:
+        case STATE_DONT:
+            send_option_to_client(telnet, TELNET_WONT, *data);
+            telnet->state = STATE_NORMAL;
+            break;
+
+        case STATE_NORMAL:
+            if (*data == TELNET_IAC) telnet->state = STATE_IAC;
+            else if (*data != '\r') /* ignore '\r' */
+            {
+                rt_mutex_take(telnet->rx_ringbuffer_lock, RT_WAITING_FOREVER);
+                /* put buffer to ringbuffer */
+                rt_ringbuffer_putchar(&(telnet->rx_ringbuffer), *data);
+                rt_mutex_release(telnet->rx_ringbuffer_lock);
+            }
+            break;
+        }
+
+        data ++;
+    }
+
+    rt_mutex_take(telnet->rx_ringbuffer_lock, RT_WAITING_FOREVER);
+    /* get total size */
+    rx_length = rt_ringbuffer_data_len(&telnet->rx_ringbuffer);
+    rt_mutex_release(telnet->rx_ringbuffer_lock);
+
+    /* indicate there are reception data */
+    if ((rx_length > 0) && (telnet->device.rx_indicate != RT_NULL))
+        telnet->device.rx_indicate(&telnet->device, rx_length);
+
+    return;
+}
+
+/* client close */
+static void client_close(struct telnet_session* telnet)
+{
+    /* set console */
+    rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
+    /* set finsh device */
+    finsh_set_device(RT_CONSOLE_DEVICE_NAME);
+
+    /* close connection */
+    closesocket(telnet->client_fd);
+
+    /* restore shell option */
+    finsh_set_echo(telnet->echo_mode);
+
+    rt_kprintf("resume console to %s\n", RT_CONSOLE_DEVICE_NAME);
+}
+
+/* RT-Thread Device Driver Interface */
+static rt_err_t telnet_init(rt_device_t dev)
+{
+    return RT_EOK;
+}
+
+static rt_err_t telnet_open(rt_device_t dev, rt_uint16_t oflag)
+{
+    return RT_EOK;
+}
+
+static rt_err_t telnet_close(rt_device_t dev)
+{
+    return RT_EOK;
+}
+
+static rt_size_t telnet_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
+{
+    rt_size_t result;
+
+    /* read from rx ring buffer */
+    rt_mutex_take(telnet->rx_ringbuffer_lock, RT_WAITING_FOREVER);
+    result = rt_ringbuffer_get(&(telnet->rx_ringbuffer), buffer, size);
+    rt_mutex_release(telnet->rx_ringbuffer_lock);
+
+    return result;
+}
+
+static rt_size_t telnet_write (rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
+{
+    const rt_uint8_t *ptr;
+
+    ptr = (rt_uint8_t*) buffer;
+
+    rt_mutex_take(telnet->tx_ringbuffer_lock, RT_WAITING_FOREVER);
+    while (size)
+    {
+        if (*ptr == '\n')
+            rt_ringbuffer_putchar(&telnet->tx_ringbuffer, '\r');
+
+        if (rt_ringbuffer_putchar(&telnet->tx_ringbuffer, *ptr) == 0) /* overflow */
+            break;
+        ptr++;
+        size--;
+    }
+    rt_mutex_release(telnet->tx_ringbuffer_lock);
+
+    /* send data to telnet client */
+    send_to_client(telnet);
+
+    return (rt_uint32_t) ptr - (rt_uint32_t) buffer;
+}
+
+static rt_err_t telnet_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+{
+    return RT_EOK;
+}
+
+/* telnet server thread entry */
+static void telnet_thread(void* parameter)
+{
+#define RECV_BUF_LEN 64
+
+    struct sockaddr_in addr;
+    socklen_t addr_size;
+    rt_uint8_t recv_buf[RECV_BUF_LEN];
+    rt_int32_t recv_len = 0;
+
+    if ((telnet->server_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
+    {
+        rt_kprintf("telnet: create socket failed\n");
+        return;
+    }
+
+    addr.sin_family = AF_INET;
+    addr.sin_port = htons(TELNET_PORT);
+    addr.sin_addr.s_addr = INADDR_ANY;
+    rt_memset(&(addr.sin_zero), 0, sizeof(addr.sin_zero));
+    if (bind(telnet->server_fd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) == -1)
+    {
+        rt_kprintf("telnet: bind socket failed\n");
+        return;
+    }
+
+    if (listen(telnet->server_fd, TELNET_BACKLOG) == -1)
+    {
+        rt_kprintf("telnet: listen socket failed\n");
+        return;
+    }
+
+    /* register telnet device */
+    telnet->device.type     = RT_Device_Class_Char;
+    telnet->device.init     = telnet_init;
+    telnet->device.open     = telnet_open;
+    telnet->device.close    = telnet_close;
+    telnet->device.read     = telnet_read;
+    telnet->device.write    = telnet_write;
+    telnet->device.control  = telnet_control;
+
+    /* no private */
+    telnet->device.user_data = RT_NULL;
+
+    /* register telnet device */
+    rt_device_register(&telnet->device, "telnet",
+                       RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STREAM);
+
+    while (1)
+    {
+        rt_kprintf("telnet server waiting for connection\n");
+
+        /* grab new connection */
+        if ((telnet->client_fd = accept(telnet->server_fd, (struct sockaddr * )&addr, &addr_size)) == -1)
+        {
+            continue;
+        }
+
+        rt_kprintf("new telnet client(%s:%d) connection, switch console to telnet...\n", inet_ntoa(addr.sin_addr), addr.sin_port);
+
+        /* process the new connection */
+        /* set console */
+        rt_console_set_device("telnet");
+        /* set finsh device */
+        finsh_set_device("telnet");
+
+        /* set init state */
+        telnet->state = STATE_NORMAL;
+
+        telnet->echo_mode = finsh_get_echo();
+        /* disable echo mode */
+        finsh_set_echo(0);
+
+        while (1)
+        {
+            /* try to send all data in tx ringbuffer */
+            send_to_client(telnet);
+
+            /* do a rx procedure */
+            if ((recv_len = recv(telnet->client_fd, recv_buf, RECV_BUF_LEN, 0)) > 0)
+            {
+                process_rx(telnet, recv_buf, recv_len);
+            }
+            else
+            {
+                /* close connection */
+                client_close(telnet);
+                break;
+            }
+        }
+    }
+}
+
+/* telnet server */
+void telnet_srv(void)
+{
+    rt_thread_t tid;
+
+    if (telnet == RT_NULL)
+    {
+        rt_uint8_t *ptr;
+
+        telnet = rt_malloc(sizeof(struct telnet_session));
+        if (telnet == RT_NULL)
+        {
+            rt_kprintf("telnet: no memory\n");
+            return;
+        }
+        /* init ringbuffer */
+        ptr = rt_malloc(RX_BUFFER_SIZE);
+        if (ptr)
+        {
+            rt_ringbuffer_init(&telnet->rx_ringbuffer, ptr, RX_BUFFER_SIZE);
+        }
+        else
+        {
+            rt_kprintf("telnet: no memory\n");
+            return;
+        }
+        ptr = rt_malloc(TX_BUFFER_SIZE);
+        if (ptr)
+        {
+            rt_ringbuffer_init(&telnet->tx_ringbuffer, ptr, TX_BUFFER_SIZE);
+        }
+        else
+        {
+            rt_kprintf("telnet: no memory\n");
+            return;
+        }
+        /* create tx ringbuffer lock */
+        telnet->tx_ringbuffer_lock = rt_mutex_create("telnet_tx", RT_IPC_FLAG_FIFO);
+        /* create rx ringbuffer lock */
+        telnet->rx_ringbuffer_lock = rt_mutex_create("telnet_rx", RT_IPC_FLAG_FIFO);
+
+        tid = rt_thread_create("telnet", telnet_thread, RT_NULL, 2048, 25, 5);
+        if (tid != RT_NULL)
+            rt_thread_startup(tid);
+    }
+    else
+    {
+        rt_kprintf("telnet: already running\n");
+    }
+
+}
+
+#ifdef RT_USING_FINSH
+#include <finsh.h>
+FINSH_FUNCTION_EXPORT(telnet_srv, startup telnet server);
+#ifdef FINSH_USING_MSH
+MSH_CMD_EXPORT(telnet_srv, startup telnet server)
+#endif /* FINSH_USING_MSH */
+#endif /* RT_USING_FINSH */