rt-thread/examples/network/tcpserver.c

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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
*/
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#include <rtthread.h>
#include <string.h>
#if !defined(SAL_USING_POSIX)
#error "Please enable SAL_USING_POSIX!"
#else
#include <sys/time.h>
#include <sys/select.h>
#endif
#include <sys/socket.h> /* 使用BSD socket需要包含socket.h头文件 */
#include "netdb.h"
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#define DEBUG_TCP_SERVER
#define DBG_TAG "TCP"
#ifdef DEBUG_TCP_SERVER
#define DBG_LVL DBG_LOG
#else
#define DBG_LVL DBG_INFO /* DBG_ERROR */
#endif
#include <rtdbg.h>
#define BUFSZ (1024)
static int started = 0;
static int is_running = 0;
static int port = 5000;
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static const char send_data[] = "This is TCP Server from RT-Thread."; /* 发送用到的数据 */
static void tcpserv(void *arg)
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{
int ret;
char *recv_data; /* 用于接收的指针,后面会做一次动态分配以请求可用内存 */
int sock, connected, bytes_received;
struct sockaddr_in server_addr, client_addr;
struct timeval timeout;
fd_set readset, readset_c;
socklen_t sin_size = sizeof(struct sockaddr_in);
recv_data = rt_malloc(BUFSZ + 1); /* 分配接收用的数据缓冲 */
if (recv_data == RT_NULL)
{
LOG_E("No memory");
return;
}
/* 一个socket在使用前需要预先创建出来指定SOCK_STREAM为TCP的socket */
if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
{
LOG_E("Create socket error");
goto __exit;
}
/* 初始化服务端地址 */
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(port); /* 服务端工作的端口 */
server_addr.sin_addr.s_addr = INADDR_ANY;
rt_memset(&(server_addr.sin_zero), 0x0, sizeof(server_addr.sin_zero));
/* 绑定socket到服务端地址 */
if (bind(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1)
{
LOG_E("Unable to bind");
goto __exit;
}
/* 在socket上进行监听 */
if (listen(sock, 10) == -1)
{
LOG_E("Listen error");
goto __exit;
}
LOG_I("\nTCPServer Waiting for client on port %d...\n", port);
started = 1;
is_running = 1;
timeout.tv_sec = 3;
timeout.tv_usec = 0;
while (is_running)
{
FD_ZERO(&readset);
FD_SET(sock, &readset);
LOG_I("Waiting for a new connection...");
/* Wait for read or write */
if (select(sock + 1, &readset, RT_NULL, RT_NULL, &timeout) == 0)
continue;
/* 接受一个客户端连接socket的请求这个函数调用是阻塞式的 */
connected = accept(sock, (struct sockaddr *)&client_addr, &sin_size);
/* 返回的是连接成功的socket */
if (connected < 0)
{
LOG_E("accept connection failed! errno = %d", errno);
continue;
}
/* 接受返回的client_addr指向了客户端的地址信息 */
LOG_I("I got a connection from (%s , %d)\n",
inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
/* 客户端连接的处理 */
while (is_running)
{
FD_ZERO(&readset_c);
FD_SET(connected, &readset_c);
/* Wait for read or write */
if (select(connected + 1, &readset_c, RT_NULL, RT_NULL, &timeout) == 0)
continue;
/* 从connected socket中接收数据接收buffer是1024大小但并不一定能够收到1024大小的数据 */
bytes_received = recv(connected, recv_data, BUFSZ, 0);
if (bytes_received < 0)
{
LOG_E("Received error, close the connect.");
closesocket(connected);
connected = -1;
break;
}
else if (bytes_received == 0)
{
/* 打印recv函数返回值为0的警告信息 */
LOG_W("Received warning, recv function return 0.");
continue;
}
else
{
/* 有接收到数据,把末端清零 */
recv_data[bytes_received] = '\0';
if (strcmp(recv_data, "q") == 0 || strcmp(recv_data, "Q") == 0)
{
/* 如果是首字母是q或Q关闭这个连接 */
LOG_I("Got a 'q' or 'Q', close the connect.");
closesocket(connected);
connected = -1;
break;
}
else if (strcmp(recv_data, "exit") == 0)
{
/* 如果接收的是exit则关闭整个服务端 */
closesocket(connected);
connected = -1;
goto __exit;
}
else
{
/* 在控制终端显示收到的数据 */
LOG_D("Received data = %s", recv_data);
}
}
/* 发送数据到connected socket */
ret = send(connected, send_data, rt_strlen(send_data), 0);
if (ret < 0)
{
LOG_E("send error, close the connect.");
closesocket(connected);
connected = -1;
break;
}
else if (ret == 0)
{
/* 打印send函数返回值为0的警告信息 */
LOG_W("Send warning, send function return 0.");
}
}
}
__exit:
if (recv_data)
{
rt_free(recv_data);
recv_data = RT_NULL;
}
if (connected >= 0)
{
closesocket(connected);
connected = -1;
}
if (sock >= 0)
{
closesocket(sock);
sock = -1;
}
started = 0;
is_running = 0;
return;
}
static void usage(void)
{
rt_kprintf("Usage: tcpserver -p <port>\n");
rt_kprintf(" tcpserver --stop\n");
rt_kprintf(" tcpserver --help\n");
rt_kprintf("\n");
rt_kprintf("Miscellaneous:\n");
rt_kprintf(" -p Specify the host port number\n");
rt_kprintf(" --stop Stop tcpserver program\n");
rt_kprintf(" --help Print help information\n");
}
static void tcpserver_test(int argc, char** argv)
{
rt_thread_t tid;
if (argc == 1 || argc > 3)
{
LOG_I("Please check the command you entered!\n");
goto __usage;
}
else
{
if (rt_strcmp(argv[1], "--help") == 0)
{
goto __usage;
}
else if (rt_strcmp(argv[1], "--stop") == 0)
{
is_running = 0;
return;
}
else if (rt_strcmp(argv[1], "-p") == 0)
{
if (started)
{
LOG_I("The tcpserver has started!");
LOG_I("Please stop tcpserver firstly, by: tcpserver --stop");
return;
}
port = atoi(argv[2]);
}
else
{
goto __usage;
}
}
tid = rt_thread_create("tcp_serv",
tcpserv, RT_NULL,
2048, RT_THREAD_PRIORITY_MAX/3, 20);
if (tid != RT_NULL)
{
rt_thread_startup(tid);
}
return;
__usage:
usage();
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}
#ifdef RT_USING_FINSH
MSH_CMD_EXPORT_ALIAS(tcpserver_test, tcpserver,
Start a tcp server. Help: tcpserver --help);
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#endif