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